JP2002364787A - Connection fitting device for flexible pressure-resistant resin tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection fitting device capable of appropriately detaining and connecting a corresponding part to be connected of a flexible pressure-resistant resin tube at a relatively strong tightening force. SOLUTION: The connection fitting device has a connection beak part 16 in which one tightening outer periphery head part 12, a male screw part 14 and the corresponding part 51 to be connected of the flexible pressure-resistant resin tube 50 are closely fitted. The device is constituted by combining a fitting body member 11 in which a receiving support surface 17 continuously contacted with a connection butting end surface and an outer periphery connection inclined surface 18 of which a diameter is gradually made small from the receiving support surface are formed on an outer periphery surface of the connection beak part and a detaining projection 19 circumferentially and projectedly provided on a part, close to the receiving support surface, on the outer periphery connection inclined surface is formed; and a detaining ring member 31 in which a female screw part 33 threaded to a male screw part on an inner periphery surface of the other tightening outer periphery head part, a detaining recessed groove 34 for detaining and restricting a clamping corresponding tip end 51a of the corresponding part to be connected between the receiving support surfaces 17 and a connection push-stop surface 36 for push-stopping and restricting a part to be connected continued to the clamping corresponding tip end between the outer periphery connection inclined surface 18 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint device for connecting a flexible pressure-resistant resin tube through which pressurized fluid such as pressurized air is supplied, and more particularly, to a pipe joint body member and the pipe joint. The present invention relates to an improvement in the structure of a retaining connection portion in a combination configuration with a retaining ring member that is screwed and fastened to a main body member to retain and connect a connected portion of a flexible pressure-resistant resin tube.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a typical example of a conventional connection pipe joint device for a flexible pressure-resistant resin tube formed by combining a pipe joint body member and a retaining ring member of this kind.

FIG. 6 is an explanatory side view showing an external appearance of a combination structure of a pipe joint body member and a retaining ring member of a conventional connection pipe joint device according to a conventional example, and FIG.
FIG. 8 is an enlarged partial explanatory view showing a portion VII in FIG. 8, and FIG. 8 is a connection pipe in a state in which a flexible pressure-resistant resin tube is retained and held by screwing a pipe joint body member and a retaining ring member. It is an explanatory side view showing an appearance form of the whole joint device.

In other words, in the configuration shown in FIGS. 6 to 8, a conventional connection pipe joint device 100 includes a pipe joint body member 101 having a hollow cylindrical shape and a pipe joint body member 10.
1 by screwing and fastening, and a combination with a fastening nut-like retaining ring member 111 for retaining and connecting a portion corresponding to the connection end of the flexible pressure-resistant resin tube 121 as a connection target. I have.

[0005] The hollow cylindrical connecting pipe joint main body member 10
1 has an internal flow path on the center axis as is well known, and, on the outer peripheral portion, one of the outer peripheral hexagonal heads from the base side serving as a non-connection portion. The male thread portion occupying a required length range while leaving the fastening abutting end face 103 at the connection side end portion of the portion 102 and the one fastening outer peripheral head portion 102, here the screw pitch is compared with a relatively small number of normal modules A male screw portion 104 that is fine and has a limited fastening force, and a connection beak that is gradually inclined to the connection end side within a required length range while leaving a connection abutting end surface 105 at the connection side end of the male screw portion 104. In this case, a connecting beak 106 for tightly fitting the connected equivalent portion of the flexible pressure-resistant resin tube 121 and finally retaining and connecting it is provided in this order.

Further, the connection inclined surface 1 of the connection beak 106
07 is set at a relatively large inclination angle, usually in the range of 7 ° to 9 °, in order to facilitate the fitting of the connected portion of the flexible pressure-resistant resin tube 121, and An arcuate retaining ridge 108 is circumferentially provided near the connection abutting end face 105 of the portion 106. In this case, the fastening ring-shaped retaining ring member 111 has the other outer peripheral head portion 112 for simplification of description, although the internal structure is omitted for simplification of description. By screwing into this, the connected portion of the flexible pressure-resistant resin tube 121 is restrained in a pressurized state.

Accordingly, in the conventional connecting pipe joint device 100 having the above-described structure, the connecting beak 10
6, the fitting portion of the flexible pressure-resistant resin tube 121 is tightly fitted to the connecting abutting end surface 105 until it abuts against the connecting abutting end surface 105, and then the retaining ring member 111 is fitted to the male screw portion 104 of the pipe joint body member 101. The connection beak 106 is screwed and fastened.
The connected portion is pressed and constrained on the outer peripheral surface of the wire to hold and retain the connection as expected.

[0008]

However, in the case of the conventional connecting pipe joint device having the above-mentioned structure, there are the following undesired problems. (A) As described above, the connection inclined surface 107 of the connection beak 106 has a relatively large inclination with the intention of facilitating tight fitting of the connected portion of the flexible pressure-resistant resin tube 121. Since the angle, that is, the angle is usually set in the range of about 7 ° to 9 °, it is easy to insert the portion to be connected at the beginning of the connection operation, but the end surface portion of the portion to be connected is easy. In order to fit tightly until it abuts against the connection abutting end face 105, a more powerful push-in operation is required. For this reason, it is expected that the close fitting operation will be accompanied by difficulty. Therefore, the retaining ridge 108 on the connection inclined surface 107 must also be provided with a relatively small cross-sectional shape. (B) Further, setting the inclination angle of the connection inclined surface 107 to a relatively large range of about 7 ° to 9 ° and setting the cross-sectional shape of the retaining ridge 108 to be relatively small is as follows. On the other hand, in the case where the external force in the pulling-out direction is applied to the connected portion of the flexible pressure-resistant resin tube 121 held in the hooked connection state in the pulling-out direction, even if it is temporary, while the action of the preceding paragraph is obtained. This means that the opposing force is reduced, and it is extremely unfavorable in practical use when it is assumed that a good restraining restraint state is always maintained as in this type of pipe joint device. (C) Further, when fastening the retaining ring member 111 to the pipe joint main body member 101, due to its structure, always apply an average screwing operation force so as to avoid applying a stronger tightening force than necessary at a time. Since the screw must be tightened, it is necessary to set the screw pitch of the male screw portion 104 for screwing in relatively finely. However, such a reduction in the size of the thread itself means that the withstand voltage of the screw portion also decreases, and as a result, a required connection withstand voltage may not be obtained. And so on.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional connecting pipe joint device and to appropriately hold the connected portion of the flexible pressure-resistant resin tube with a relatively strong tightening pressure. An object of the present invention is to provide a connection fitting device improved so that connection can be made.

[0010]

According to one aspect of the present invention, there is provided a connecting pipe for pulling and connecting a relatively hard and elastic flexible flexible resin tube. A coupling device, comprising: a male screw portion having a required length range extending while leaving one fastening outer peripheral head on a base portion, a fastening abutting end surface on a connection portion side of the one tightening outer head, and the male screw portion. A connection beak of a required length range which is extended to leave a connection abutting end face on the connection portion side and closely fits a portion corresponding to the connection of the flexible pressure-resistant resin tube, and has an outer periphery of the connection beak The surface has a relatively flat receiving support surface of a required length range connected to the connection abutting end surface, an outer peripheral connection inclined surface gradually reduced in diameter from the receiving support surface at a required inclination angle, and an outer peripheral connection inclined surface. A peripheral portion protruding from a portion close to the upper receiving support surface; A hollow cylindrical pipe joint main body member formed with a retaining ridge of a required width in which a support surface side is raised with a relatively steep slope and a connection part side is lowered with a relatively gentle slope, and the hollow cylindrical pipe; A female screw part, which is combined with the joint main body member and has the other tightening outer peripheral head, and which is screwed to the male screw part on the inner peripheral surface of the other tightening outer peripheral head; A retaining groove for retaining and restraining a tip portion corresponding to the clamping pressure of the connected equivalent portion between the supporting surface and a supporting step, which is connected to a pressing step portion of the retaining groove and mainly to the outer peripheral connection inclined surface; It is characterized in that it is constituted by combining with a fastening nut-shaped retaining ring member having a connection pressing surface for pressing and restraining a connected portion following the clamping pressure corresponding tip portion.

According to a second aspect of the present invention, in the configuration of the connecting pipe joint device for a flexible pressure-resistant resin tube according to the first aspect, an outer peripheral connection at a connecting beak of the retaining ring member is provided. It is characterized in that the inclination angle of the inclined surface is set within a relatively gentle inclination angle range of 4 ° to 6 °.

In the connecting pipe joint device for a flexible pressure-resistant resin tube according to the first and second aspects of the present invention, the flexible pressure-resistant resin tube is provided on the outer connecting slope of the connecting beak including the receiving support surface of the pipe joint body member. By pushing in the tip corresponding to the clamping pressure of the connected portion, the connected portion is temporarily fitted over the retaining ridge. Then, the temporary fitting operation at this time is such that the inclination angle of the outer peripheral connection inclined surface is set to a normal inclination angle range of 7 °.
The inclination angle range is set to 4 ° to 6 ° smaller than 9 °, and the retaining ridge formed on the outer peripheral connection inclined surface is also a falling surface with a relatively gentle inclination on the connection direction side. Is set relatively easily.

Further, after the female thread portion of the retaining ring member is partially threadedly engaged with the male thread portion of the pipe joint main body member in the temporarily fitted state, the retaining ring member resists the elasticity of the connected portion. With the powerful rotation screwing operation, the retaining ring member is screwed until it abuts against the fastening abutment end face and firmly tightened, thereby connecting the required flexible pressure-resistant resin tube, that is, to the connection beak As a result, the expected connection is made by the restraining restraint of the connected portion.

In the state where the portion to be connected is connected to the connecting beak as described above, the retaining ring member is moved by screwing, and furthermore, the retaining ring member is pressed and moved while being rotated. In response to the above, the tip corresponding to the squeezing pressure at the connected part is connected to the connecting abutment due to the applied screw pressing force and the differential range between the male screw part and the female screw part. In the form surrounded by the end surface and the receiving support surface, and the space surrounded by the retaining concave groove and the pressing step portion, the connection abutment end surface and the pressing step portion are strongly pressed into the space and pressurized. The connection state is maintained, and furthermore, the entire surface is in close contact with the retaining ridge and is retained by the rising arc surface due to the relatively steep inclination. As a result, a substantial and effective connection is achieved. The action is performed.

According to a third aspect of the present invention, in the configuration of the connecting pipe joint device for a flexible pressure-resistant resin tube according to the first or second aspect, the pressing step of the retaining ring member is connected to the connecting step. The portion corresponding to the inner surface edge with the stop surface and the portion corresponding to the inner surface edge on the end side of the connection pressing surface are each formed in a chamfered arc surface.

According to a fourth aspect of the present invention, there is provided the connecting pipe joint device for a flexible pressure-resistant resin tube according to any one of the first to third aspects, wherein the retaining ring member is provided. The end of the connection pressing surface is set so as to substantially protrude to the outside of the end of the connection beak at the end of the fastening.

In the connecting pipe joint device for a flexible pressure-resistant resin tube according to the third and fourth aspects, a portion corresponding to the inner surface edge of the pressing step portion and the connecting pressing surface is formed as a chamfered arc surface, so that it is retained. With the pressurizing movement of the ring member while being rotated,
The operation of introducing the enlarged diameter of the bent end portion corresponding to the squeezing pressure at the connected portion is smoothly performed. In addition, a portion corresponding to the inner edge on the end side of the connection pressing surface is formed into a chamfered arc surface (corresponding to claim 3), and the end of the connection pressing surface is connected to the connection beak at the time of completion of the fastening. (Corresponding to claim 4), it is set so as to substantially protrude to the outside of the end portion of the flexible pressure-resistant resin tube. The expansion can be smoothly received, and the fear of damaging the surface corresponding to the tube is eliminated.

According to a fifth aspect of the present invention, in the configuration of the connecting pipe joint device for a flexible pressure-resistant resin tube according to any one of the first to fourth aspects, the male thread of the pipe joint body member is provided. The screw pitch between the portion and the female screw portion of the retaining ring member screwed to the male screw portion is set relatively large and tough.

In the connecting pipe joint device for a flexible pressure-resistant resin tube according to the present invention, the thread pitch between the male screw portion and the female screw portion is formed relatively large and strong, and the pressure strength of the thread itself is reduced. Due to the increase, the screwing operation can be performed powerfully and quickly in accordance with the respective actions of the first to fourth aspects.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a joint device for connecting a flexible pressure-resistant resin tube according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is an overall side view showing an external appearance of a combined configuration of a pipe joint body member and a retaining ring member in a connection pipe joint device for a flexible pressure-resistant resin tube to which the present embodiment is applied. FIG. 2 is a cross-sectional explanatory view showing an enlarged part II in FIG. FIG. 3 (a) is a partially cutaway side view showing a schematic configuration of the pipe joint body member and the retaining ring member, respectively, and FIG. 3 (b) is a sectional view of the pipe joint body member and the retaining ring member. FIG. 4 is a half-cut side view showing a schematic configuration of a flexible pressure-resistant resin tube which is pulled and connected by screwing. Further, FIG. 4 is a longitudinal sectional side view showing the entire configuration of the connecting pipe joint device in a state where the flexible pressure-resistant resin tube is pulled and connected by screwing and fastening the pipe fitting main body member and the retaining ring member. FIG. 5 is an explanatory sectional view showing a V portion in FIG. 4 in an enlarged manner.

In the apparatus configuration shown in FIGS. 1 to 5, the connection pipe joint device 10 according to the present embodiment includes a hollow cylindrical pipe joint body member 11 and a pipe joint body member 11.
And a fastening nut-shaped retaining ring member 31 that retains and connects the connected equivalent portion 51 on the corresponding end side of the flexible pressure-resistant resin tube 50 to be connected. .

The hollow cylindrical pipe joint main body member 11 comprises:
An internal flow path A is provided on the central axis, and a mounting screw portion 11a for mounting to a pressurized fluid supply source is formed on the connected end side of the internal flow path A, for example. If there is, from the base side as the connected end, a fastening tool,
Here, one of the outer peripheral hexagonal heads 12 and one of the outer peripheral heads 1 are formed in a hexagonal shape so that they can be gripped with a hexagonal wrench and screwed and turned when screwed.
2 a connecting abutting end surface (a step surface for making the next target portion a small diameter peripheral surface and obtaining the abutting abutting end surface) 1
Required length leaving 3 (in this case, effective length La1)
The male screw part occupying the area, here the relatively large number of modules (the number of modules larger than the usual number of modules conventionally used), the screw pitch is relatively coarse,
Accordingly, a male screw portion 14 that can obtain a relatively high fastening force, and a connection abutting end surface (similarly, the next target portion is formed into a small diameter peripheral surface, and the connection abutting end surface is formed on the connecting portion side of the male screw portion 14). The connecting beak of the required length (in this case, the effective length La2 + La3) in the range of the connecting beak, in which the flexible pressure-resistant resin tube 50 (the details of the material and the like will be described later), leaving a step surface 15 for obtaining the same. Equivalent parts (clamping pressure for holding connection)
A connecting beak 16 for tightly fitting and finally retaining the connection (part corresponding to the pressing) 51 is provided sequentially. In the drawing, reference numeral 14a indicates an escape groove for a thread cutting tool or the like at the time of cutting the thread surface of the male screw portion 14.

On the outer peripheral surface of the connecting beak portion 16,
A relatively flat receiving support surface 17 connected to the connection butting end surface 15 and occupying a required length (effective length La2 described above); and a required length connected to the receiving support surface 17 (see above). ), And a relatively small required inclination angle (a receiving inclination angle for receiving and fitting the connected equivalent portion 51 of the flexible pressure-resistant resin tube 50, and (Corresponding to a pressing tilt angle for holding and restraining the connected-corresponding portion 51 and holding and connecting the same), in this case, the tilt angle 4 of which the diameter is gradually reduced toward the connection end with respect to the central axis. Connection slopes 18 in the range of 6 ° to 6 ° (in the range of 4 ° to 6 °, which are smaller than the corresponding relatively large range of 7 ° to 9 °). ing. Then, on the connection inclined surface 18, in a portion close to the receiving support surface 17, the receiving support surface 17 side is raised by a rising arc surface 20 by a relatively steep inclination, and the connection side is relatively raised. A retaining ridge 19 having a required width, which is lowered on a lowering surface 21 having a gentle inclination, is provided so as to protrude.

Further, the fastening nut-shaped retaining ring member 31 combined with the pipe joint body member 11 has the other fastening outer peripheral head 32 similar to the above at the outer peripheral portion. On the inner peripheral surface of the tightening outer peripheral head 32,
The required length to be screwed into the male screw part 14 (in this case, the required length corresponding to the effective length La1 of the male screw part 14 is required to obtain the differential range corresponding to the required fastening pressure ΔP. The internal thread portion 33 occupying the effective length La1-ΔLa1 = Lb1) which is set short, and the connection with the flexible pressure-resistant resin tube 50 between the internal thread portion 33 and the receiving support surface 17 connected thereto. The tip 5 corresponding to the clamping pressure of the portion 51
Required length to hold and restrain 1a (in this case,
The retaining groove 34 occupying an effective length Lb2 substantially equal to the effective length La2 of the receiving support surface 17, that is, La2 ≒ Lb2), and an inner surface corresponding to the connection portion side inner surface of the retaining groove 34. It is connected to the pressing step portion 35 and presses and restrains the corresponding portion 51b of the flexible pressure-resistant resin tube 50 following the corresponding distal end portion 51a of the flexible pressure-resistant resin tube 50 at least between the connecting beak portion 16 and the connection inclined surface 18. Required in this case (in this case, the effective length La3 of at least the connection inclined surface 18)
Effective length Lb3 set slightly longer than Lb3, that is, L
a2 + ΔLa2 ≒ Lb3) Connection pressing surface 36 occupying the range
And are formed respectively. Also, here, the portion corresponding to the inner surface edge of the pressing step portion 35 and the connection pressing surface 36 is:
Similarly, the portion corresponding to the inner surface edge on the end portion side of the connection pressing surface 36 is also chamfered into an arc surface 38.

Further, the flexible pressure-resistant resin tube 50
In the same manner as in the prior art, for example, polyurethane, polyamide, polyester, polyvinyl and the like have good moldability and relatively excellent toughness, pressure resistance, and flexibility (elasticity). It may be formed by extruding a thermoplastic resin material into a hollow tube having a required inner and outer diameter over the entire length.

Therefore, the pipe joint body member 11 of the present embodiment is provided.
In this case, in the connecting pipe joint device 10 having a configuration in which the connecting pipe member and the retaining ring member 31 are combined, the connecting pipe member body 11 is connected to, for example, a discharge port tap member with a male thread of a pressurized fluid supply source (both not shown). The mounting screw portion 11a of the pipe joint main body member 11 is firmly fastened by a rotation screwing operation of a hexagonal wrench held on one of the fastening outer peripheral heads 12 and used. Tube 5
With respect to 0, the retaining ring member 31 as a fastening nut is once loosely fitted in advance from the end side on the outer peripheral surface of the flexible pressure-resistant resin tube 50 to be the connected equivalent portion 51. I do.

In the above-mentioned preparation state, first, the flexible pressure-resistant resin tube 50 is placed on the connecting inclined surface 18 including the receiving support surface 17 of the connecting beak 16 corresponding to the connecting portion of the pipe joint body member 11. A position portion where the pinching-corresponding distal end portion 51a of the connected equivalent portion 51 abuts on the connecting abutting end surface 15 beyond the retaining ridge 19 on the connecting inclined surface 18 by resisting the elasticity of the portion itself. Or, at least to the position as close as possible to the temporary insertion.

That is, in the temporarily fitted state, the tip 51 a corresponding to the clamping pressure of the flexible pressure-resistant resin tube 50 extends from the retaining projection 19 on the connecting inclined surface 18 at the connecting beak 16 to the receiving support surface 17. A mode in which the diameter is slightly increased elastically (the inclination angle 4 ° to 6 ° given to the connection inclined surface 18)
In a correspondingly enlarged diameter) and is temporarily held by the elastic restoring force accompanying the diameter expansion. In this case, for the fitting and pushing operation, the outer peripheral surface inclination of the connection inclined surface 18 is set to an inclination angle range 4 ° to 6 ° smaller than the conventional general inclination angle range of 7 ° to 9 °. Since the connecting portion side of the retaining ridge 19 is set to the falling surface 21 with a relatively gentle inclination, the pinching-corresponding distal end portion 51a and, consequently, the connected portion 51 correspond to the retaining projection. It can be easily pushed over the ridge 19 relatively easily.

Subsequently, the retaining ring, which has been loosely fitted beforehand, is kept in a state where the portion 51 to be connected of the flexible pressure-resistant resin tube 50 is temporarily fitted into the connecting beak 16 of the pipe joint body member 11. The member 31 is made of a flexible pressure-resistant resin tube 5.
0 on the outer peripheral surface of the pipe joint body 51 toward the connected equivalent portion 51, and partially engage the female screw portion 33 of the retaining ring member 31 with the male screw portion 14 of the pipe joint main body member 11, A turning screwing operation using a hexagon wrench held by the other tightening outer peripheral head 32 of the holding ring member 31, here, a strong turning screwing operation against the elasticity of the connected portion 51, causes the holding ring to be turned. The connection of the required flexible pressure-resistant resin tube 50, that is, by screwing the member 31 until it abuts against the fastening abutting end surface 13 and firmly fastening it, that is,
The connection holding operation of the connected equivalent portion 51 to the connection beak portion 16 as expected is terminated. In this screwing operation, the male screw part 14 and the female screw part 33 corresponding to the male screw part 14 are formed with a screw thread having a relatively large screw pitch, and the pressure resistance of the screw thread itself is set. Due to the increased strength, the screwing operation can be performed strongly and quickly.

At the end of the connection operation, the retaining ring member 31 is screwed forward, and the connection pressing surface 36 is turned as if it were riding in the direction along the inclination angle of the connection inclined surface 18. With the pressurized movement while being moved, the connected equivalent portion 51 temporarily inserted into the connection inclined surface 18 is applied with the screwing pressing force, and the male screw portion 14 of the effective length range La1 and the effective length. Range Lb1 (= La1-ΔLa1)
4 and 5 in the form of being compressed in the same direction due to the differential range with the internal thread portion 33 of the female screw portion 33. As a result, as shown in FIGS. Is bent into a space surrounded by the connection abutting end surface 15 and the receiving support surface 17 of the pipe joint body member 11, and the retaining groove 34 and the pressing step 35 of the retaining ring member 31. In this manner, the space is filled as much as possible in such a form as to be inserted and the diameter is expanded, and the connection abutting end face 15 and the pressing step 35 are pressed and pressed, so that the connection state is established. In addition to being restrained and held, the entire surface is in close contact with the retaining ridge 19 and is also retained and restrained by the rising surface 20 due to the relatively steep inclination of the retaining ridge 19, that is, , Where it is practical and effective It become the connection action is achieved satisfactorily.

In the case of the present embodiment, a connection pressing surface 36 connected to the pressing step 35 of the retaining ring member 31 is provided.
The effective length range of the connection beak 16 is the connection slope 18
Is set to be slightly longer than the effective length range at the time of fastening to the connection end side, and a portion corresponding to the inner surface edge of the pressing step 35 and the connection pressing surface 36 is chamfered. Because the surface 37 is formed on the surface 37, and the portion corresponding to the inner edge of the end of the connection pressing surface 36 is also formed on the chamfered arc surface 38, depending on the chamfered arc surface 37, the screw on the retaining ring member 31 With the pressurized movement while being advancing and rotating, the introduction of the bend expansion of the tip 51a corresponding to the squeezing pressure at the connected portion 51 is smoothly performed, and the connection protrudes longer toward the connection portion side. The pressing surface 36 and the chamfered arc surface 38 can smoothly receive some expansion of the flexible pressure-resistant resin tube 50 due to the flow of the pressurized fluid after the connection is completed. Deal effectively without damage to the surrounding surface Door than it can.

[0033]

As described above in detail in the embodiments,
According to the connecting pipe joint device for a flexible pressure-resistant resin tube according to claims 1 and 2 of the present invention, the following effects can be obtained. That is, the temporary fitting operation beyond the retaining ridge by pushing the connected portion of the flexible pressure-resistant resin tube onto the outer peripheral connection inclined surface of the connection beak including the receiving support surface of the pipe joint body member is performed by the outer peripheral connection. The inclination angle of the inclined surface is set to an inclination angle range of 4 ° to 6 ° which is smaller than a normal general inclination angle range of 7 ° to 9 °, and the retaining projection on the outer peripheral connection inclined surface is set. The ridges are also relatively easy because they are set on the falling surface with a relatively gentle slope.

In the temporarily inserted state, the connection operation by screwing and rotating the retaining ring member into the pipe joint body member is performed by partially screwing the female thread portion of the retaining ring member into the male thread portion of the pipe joint body member. After that, the retaining ring member can be formed by a strong rotation screwing against the elasticity of the connected portion, and in this case, the retaining ring member is screwed until it comes into contact with the fastening abutting end face, and is firmly tightened. As a result, the required connection of the flexible pressure-resistant resin tube, that is, the expected connection by the restraining restraint of the portion to be connected to the connection beak is made.

In a state in which the portion to be connected is connected to the connecting beak, the retaining ring member is moved in response to the screwing movement and, consequently, the pressing movement of the retaining ring member while being rotated. The connection-equivalent portion is a screwing pressing force to be applied, and for the differential range between the male screw portion and the female screw portion, the tip corresponding to the squeezing pressure in the connected equivalent portion has a connection abutting end surface and a receiving support surface, And it is strongly bent into the space surrounded by the retaining groove and the pressing step, and is expanded in diameter. While holding, the entire surface can be in close contact with the retaining ridge, and can be substantially and effectively connected and retained by being restrained and restrained by the rising arc surface due to its relatively steep inclination. Despite its relatively simple connection structure, its practical effect is Umate large.

According to the connecting pipe joint device for a flexible pressure-resistant resin tube according to the third and fourth aspects of the present invention, in addition to the above-described effects, the inner edge of the pressing step portion and the connecting pressing surface is provided. Because the corresponding part is formed in a chamfered arc surface,
It is possible to effectively and smoothly introduce a bend expansion of a tip portion corresponding to a squeezing pressure at a portion to be connected, which is caused by a pressurizing movement of the retaining ring member while being rotated, and at the same time, connecting The corresponding part of the inner surface edge on the end side of the pressing surface is formed as a chamfered arc surface,
In addition, since the end of the connection pressing surface is substantially protruded to the outside of the end of the connection beak at the time of completion of the fastening, the connection after the connection of the flexible pressure-resistant resin tube is completed. Some expansion due to the flow of the pressurized fluid can be smoothly received, and the fear of damaging the surface corresponding to the tube can be easily eliminated.

Further, according to the connecting pipe joint device for a flexible pressure-resistant resin tube according to the fifth aspect of the present invention, in addition to the above-described effects, in addition to the male screw part of the pipe joint main body member and the male screw part, Since the screw pitch with the female screw portion of the retaining ring member to be screwed is formed relatively large and strong, the pressure resistance of the thread itself is increased, and the screwing operation can be performed strongly and quickly.

[Brief description of the drawings]

FIG. 1 is an overall side view showing each appearance of a combination of a connection fitting body and a connection retaining ring member in a connection fitting device for a flexible pressure-resistant resin tube to which an embodiment of the present invention is applied. .

FIG. 2 is an explanatory sectional view showing a portion II in FIG. 1 in an enlarged manner.

FIG. 3 (a) is a partially cutaway side view showing a schematic configuration of a connecting pipe joint body and a connection retaining ring member, respectively, and FIG. It is a half section side view which shows the schematic structure of the flexible pressure-resistant resin tube hold | maintained and hold | maintained by screwing fastening with a ring member.

FIG. 4 is a vertical cross-sectional side view showing the entire configuration of the connection fitting device in a state where the flexible pressure-resistant resin tube is retained and held by screwing the connection fitting main body and the connection retaining ring member.

FIG. 5 is an explanatory sectional view showing a V portion in FIG. 4 in an enlarged manner;

FIG. 6 is an explanatory side view showing an external appearance of a combination configuration of a pipe joint body member and a retaining ring member of a conventional connection pipe joint device according to a conventional example.

FIG. 7 is an enlarged partial explanatory view showing a portion VII in FIG. 6;

FIG. 8 is a side explanatory view showing an external appearance of the entire connection pipe joint device in a state where the flexible pressure-resistant resin tube is pulled and connected and held by screwing and fastening the pipe joint body member and the retaining ring member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Connecting pipe joint apparatus 11 Pipe joint main body member 11a Mounting screw part of a pipe joint main body member A Internal flow path of a pipe joint main body member 12 One of the outer peripheral head portions 13 Fastening abutting end face 14 Male screw section (with a relatively large number of modules) Effective length range La1) 14a Relief groove for male thread 15 Connection abutting end face 16 Connection beak (effective length range La2 + La3) 17 Receiving support surface (effective length range La2) 18 Outer peripheral connection inclined surface (small inclination angle range 4) °
Effective length range La3) within ~ 6 ° 19 Retaining ridge 20 Rising arc surface due to relatively steep inclination of retaining ridge 21 Falling surface due to relatively gentle inclination of retaining ridge 31 Fastening nut-shaped Retaining ring member 32 Other tightening outer peripheral head 33 Internal thread (effective length range La1-ΔLa1)
= Lb1) 34 Retaining groove (effective length range La2 ≒ Lb)
2) 35 pressing step 36 connecting pressing surface (effective length range La2 + ΔLa)
2 ≒ Lb3) 37 The chamfered surface of the portion corresponding to the inner edge of the pressing step and the connection pressing surface 38 The chamfered arc surface of the portion corresponding to the inner edge of the end of the connecting pressing surface 50 Flexible pressure-resistant resin tube 51 Flexible Connected portion of pressure-resistant resin tube 51a Applied tip corresponding to pinching pressure of connected portion 51b Applied portion of pressed portion of connected portion ΔP Fastening pressure

Claims (5)

[Claims] 1. A connecting pipe joint device for pulling and connecting a relatively hard and elastic flexible pressure-resistant resin tube, wherein one of a tightening outer peripheral head is connected to a base side, and the other tightening outer circumferential head is connected. A male screw part of a required length range extending leaving a fastening abutting end face on the side of the flexible screw-resistant resin tube. A connection beak having a required length range for tightly fitting the connection equivalent portion, and a relatively flat receiving support surface of a required length range connected to the connection abutting end surface is provided on an outer peripheral surface of the connection beak portion. An outer peripheral connection inclined surface gradually reduced in diameter at a required inclination angle from the receiving support surface, and a peripherally protruding portion is provided on a portion of the outer peripheral connection inclined surface close to the receiving support surface, and the receiving support surface side is relatively steeply inclined. And fall down with a relatively gentle slope on the connection side A hollow cylindrical pipe joint main body member having a retaining ridge of a required width, and a hollow outer peripheral head combined with the hollow cylindrical pipe joint main body member, and the other tightening outer circumference. A female threaded portion screwed to the male threaded portion on the inner peripheral surface of the head, a pulling portion connected to the female threaded portion for restraining the tip corresponding to the pressure of the connected portion between the receiving support surface and the receiving portion; A retaining depression groove, and a connection pressing surface which is connected to the pressing step portion of the retaining concave groove and mainly presses and restrains a connected portion following the clamping pressure corresponding tip portion with the outer peripheral connection inclined surface. A connection pipe joint device for a flexible pressure-resistant resin tube, comprising a combination of a formed fastening nut-shaped retaining ring member. 2. The inclination angle of the outer peripheral connection inclined surface in the connection beak of the retaining ring member is set to a relatively gentle inclination angle of 4 ° to 4 °.
The connecting pipe joint device for a flexible pressure-resistant resin tube according to claim 1, wherein the angle is set within a range of 6 °. 3. A portion corresponding to the inner edge of the pressing step of the retaining ring member and the connection pressing surface, and a portion corresponding to the inner edge on the end side of the connection pressing surface are each formed in a chamfered arc surface. The connecting pipe joint device for a flexible pressure-resistant resin tube according to claim 1 or 2, wherein 4. The end of the connection pressing surface of the retaining ring member is set so as to substantially protrude outside the end of the connection beak at the time of completion of fastening. The connecting pipe joint device for a flexible pressure-resistant resin tube according to any one of claims 1 to 3, wherein: 5. The screw pitch of the male thread portion of the pipe joint body member and the female thread portion of the retaining ring member screwed to the male thread portion is set relatively large and tough. The connecting pipe joint device for a flexible pressure-resistant resin tube according to any one of claims 1 to 4.