JP3535956B2 - Connector device and check valve used for it - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector device having a backflow prevention function and a check valve used therein.

[0002]

2. Description of the Related Art Generally, in various pipes such as automobile pipes, a check valve (check valve) is attached in the middle (or at the end) to prevent the backflow of fluid flowing in the pipes. . A connection device for connecting these pipes with a backflow prevention function is disclosed in Japanese Patent Laid-Open No. 8-
It is proposed in Japanese Patent No. 312863. As shown in FIG. 13, the pipe connecting device 40 is a device for connecting to the pipe 39 having an annular locking portion 39b at the end 39a, and is provided on the inner peripheral portion of the inflow side end 41a of the cylindrical housing 41. , A large diameter portion 42 and a small diameter portion 43 following the large diameter portion 42 are formed, and the large diameter portion 42 is internally fitted with an annular body 44 in which a plurality of retaining claws 44a are elastically fitted inward. Long bush 45
The short bush 46 and the short bush 46 are fitted inside with a predetermined gap, and the gap between the bushes 45 and 46 and the short bush 4 are
An O-ring 47 is positioned and fitted in a gap between the end portion 6 and the end of the small diameter portion 43. Further, a backflow preventing means 50 is provided at a portion on the outflow side of both O-rings 47. The backflow preventing means 50 is provided in the cylindrical housing 4
1. A sleeve 51 which is fitted and fixed to the inner peripheral portion of the central portion of 1.
A valve seat 51a formed by tapering the end face of the sleeve 51 on the outflow side, and a cross-shaped valve body 52 movably arranged at a part on the outflow side of the valve seat 51a.
And the valve seat 5 fixed to the inflow side end of the valve body 52.
A truncated cone-shaped valve head 53 that can be seated on 1a;
The O-ring 54 fixed to the outer peripheral portion of the valve 3 and closely contacting the valve seat 51a when seated, and the valve body 5 internally fitted and fixed to the inner peripheral portion.
2 is a compression spring 55 that biases the valve seat 51a toward the valve seat 51a. The backflow prevention means 50 causes the valve head 53 of the valve body 52 to be seated on the valve seat 51a by the biasing force of the compression spring 55 to close the valve.
The valve main body 52 is moved to the fluid outflow side against the biasing force of the compression spring 55, and the valve head 53 is separated from the valve seat 51a to open the valve. In the figure, 41b is an outflow side end of the cylindrical housing 41, and a second pipe (not shown) is externally fitted to the outer periphery of the cylindrical housing 41 so as to communicate with the pipe 39.

To join the pipe 39 to the cylindrical housing 41, the inflow side end portion 41a of the cylindrical housing 41 is connected.
14, the end 39a of the pipe 39 is inserted, and as shown in FIG. 14 (the one-dot chain line indicates the middle of the insertion), the annular locking portion 39b of the end 39a and the retaining in the cylindrical housing 41 are prevented. The claw 44a for engagement is locked. This makes piping 3
9 is locked in the cylindrical housing 41, and both O-rings 47 are brought into close contact with the outer circumference of the pipe 39 to maintain liquid tightness. In this state, normally (when the fluid flows from the inflow side to the outflow side), as shown in FIG. 15, the compression spring 55 is caused by the pressure of the fluid flowing from the inflow side end portion 41a of the cylindrical housing 41. Valve head 5 against the urging force of
3 is separated from the valve seat 51a to allow the fluid to flow to the outflow side, and when the fluid flows backward (when the fluid flows from the outflow side to the inflow side),
As shown in FIG. 3, the valve head 53 is seated on the valve seat 51a by the biasing force of the compression spring 55 to prevent the backflow.

[0004]

However, in the above-mentioned pipe connecting device 40, both O-rings 47 attached to the small diameter portion 43 of the cylindrical housing 41 and the backflow preventing means 50.
And are manufactured separately, and the number of parts is large. Moreover,
The work of attaching both O-rings 47 and the work of attaching the backflow prevention means 50 must be performed separately, which is a serious problem in actual work in that it takes time to perform these works.

Therefore, in order to reduce the number of parts and to speed up the mounting work (although there is no pipe retaining effect), instead of the pipe connecting device, as shown in FIG. L-shaped annular seal portion 61
Is used as a check valve 60 of a duck bill type, the annular seal portion 61 of the check valve 60 is placed on the flange 63 formed at the upper end portion of the lower pipe 62, and in that state, the upper pipe 64 It is conceivable that the L-shaped bottom surface of the annular seal portion 61 is pressure-contacted with the lower end surface to thereby hold both the pipes 62 and 64 in a liquid-tight manner. Also, as shown in FIG.
A duck bill type check valve 65 integrally formed with a cylindrical annular seal portion 66 at the upper end opening is used. The annular seal portion 66 of the check valve 65 is formed at the lower end portion of the upper pipe 67. It is also conceivable to attach it to the outer periphery. In this case, the box 69 is provided at the upper end of the lower pipe 68.
And an insertion hole 69a formed in the upper wall of the box 69.
The outer peripheral surface of the upper pipe 67 is held liquid-tight by the inner peripheral surface of the.

However, the check valve 60 shown in FIG.
Has a structure in which the annular seal portion 61 is placed on the flange 63 of the lower pipe 62.
Since the outer peripheral surface of the upper pipe 64 is not sealed by the outer peripheral surface of the upper pipe 64,
The check valve 60 cannot be attached to the upper pipe 64 by itself because the check valve 60 has a larger diameter than the outer peripheral surface of the check valve 4. On the other hand, in the structure using the check valve 65 shown in FIG. 17, it is difficult to use the outer peripheral surface of the annular seal portion 66 of the check valve 65 as a sealing surface, and thus the box at the upper end of the lower pipe 68 is used. Since the outer peripheral surface of the upper pipe 67 is sealed by utilizing the inner peripheral surface of the insertion hole 69a formed in the portion 69, there is a problem that the structure becomes complicated. Moreover, when the check valve 65 shown in FIG. 17 is attached to the upper pipe 67, the portion of the annular seal portion 66 corresponding to the locking projection 67a of the upper pipe 67 expands in diameter, so that the attached state is maintained for a long period of time. Continuing, there is also a problem that cracks and the like are likely to occur in the expanded diameter portion.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a connector device having a small number of parts, easy installation work, and a simple retaining structure, and a check valve used therein. .

[0008]

In order to achieve the above object, the present invention provides a connector, a connecting portion provided at an end portion of the connector, and an outer periphery of the connecting portion, which is externally fitted and connected to the connector. And a check valve provided at an end portion of the connector, wherein an annular groove is provided around an outer periphery of a coupling portion of the connector, and the annular groove is deeper than the annular groove. At the portion of the coupling portion on the side, a retaining step for retaining the tubular body in a retaining state is provided, and the check valve is provided.
The duckbill tip part, a tubular part following this, and a seal part formed in a thick section with a circular cross section at the end part of this tubular part. The seal portion of the check valve is fixed to the annular groove of the connector while the synthetic resin is attached to the seal portion of the check valve.
The first gist is a connector device in which a fat tubular body is fitted ,
It is composed of a duckbill tip, a tubular portion that follows it, and a seal portion formed at the end of the tubular portion with a thick cross-section . The seal portion is attached to the connector and the connector. A second aspect of the present invention is a check valve fixed in a pinching state between the check valve and a fitting synthetic resin tubular body.

That is, according to the connector device of the present invention, an annular groove is provided around the outer periphery of the connecting portion of the connector end portion (which connects the end portions of the synthetic resin tubular body in an externally fitted shape), and the inner side of the annular groove is deeper than the annular groove. A retaining step for retaining the tubular body in a retaining shape is provided at the side coupling portion. Further, the check valve provided at the connecting portion of the connector is constituted by a duck bill tip portion, a tubular portion following the duck bill tip portion, and a seal portion formed at the end portion of the tubular portion to have a circular cross section and a thick wall shape. is doing. Then, the tubular portion of the check valve is externally fitted to the coupling portion of the connector, and a thick seal portion having a circular cross section is fixed to the annular groove of the connector, and the synthetic resin tubular body is attached to the seal portion. Outside
It is fitted . Thus, in the connector device of the present invention,
Since the check valve is fixed to the connector, the connector itself can have a backflow prevention function. Moreover, in the state where the thick-walled seal portion having a circular cross- section is fixed to the annular groove of the connector, the outer peripheral portion of the thick-walled seal portion having a circular cross-section protrudes from the annular groove, and the protruding portion Since the diameter of the portion of the tubular body to be fitted is increased, this portion also has a pipe retaining effect. Therefore, even if the engagement force between the retaining step of the coupling portion of the connector end portion and the tubular body is slightly weak, the retaining portion has a sufficient retaining effect due to the engagement between the seal portion and the enlarged diameter portion of the tubular body. As a result, the structure of the retaining step can be simplified, and it is not necessary to provide retaining means on the tubular body. Further, since the check valve has the seal portion integrated, the check valve 50 and the O-ring 47 as in the conventional example.
The number of parts is reduced compared to the case where and are manufactured separately,
It is possible to simplify management aspects such as inventory management. Further, the check valve can be attached to the end portion of the connector only by fixing the seal portion to the annular groove of the connector, which facilitates the work of attaching the check valve. That is, the work of fixing the seal portion to the annular groove also serves as the work of attaching the check valve to the connector, and the work of attaching the check valve can be omitted. In addition, since insertion into a synthetic resin tubular body improves insertability, it is preferable to flare the tip of the tubular body and apply an insertion aid such as silicone oil to the duck bill surface.

Further, in the present invention, the seal portion is O.
The ring has the following advantages. That is, by pressing the outer peripheral surface of the O-ring of the check valve fixed in the annular groove of the connector with the inner peripheral surface of the tubular body fitted onto the connector, the outer peripheral surface of the O-ring is moved to the inner peripheral surface of the tubular body. In addition to pressing and sealing, the inner peripheral surface of the O-ring can be pressed and sealed to the groove bottom surface of the annular groove, and one O-ring can seal at two places. The structure can be simplified compared to the conventional structure. Moreover, a tubular body whose inner diameter at one end is smaller than the outer diameter of the connector coupling portion is used to couple the two by pressing one end of the tubular body into the connector coupling portion.
Due to the press-fitting, one end of the tubular body may be expanded in diameter, and the dimensional accuracy of the peripheral surface may be reduced. However, in the present invention, even in such a case, the outer peripheral portion of the O-ring is inside the tubular body. Since it is in close contact with the peripheral surface, it can reliably seal. Even when the O-ring of the check valve is fitted into the annular groove of the connector in a retaining manner, a force for expanding the O-ring, such as the check valve of FIG. 17, almost acts on the O-ring. Therefore, in the present invention, even if the check valve is attached to the connector for a long period of time, the O-ring will not be cracked due to the diameter expansion. On the other hand, according to the check valve of the present invention, it is possible to obtain a connector having both a backflow prevention function and a sealing function, and a connector device having the above-mentioned excellent effects.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the connector device of the present invention. In the figure, 1 is a polyamide 11 resin pipe, and 2 is a steel pipe metal pipe for connecting to this. Reference numeral 3 is a quick connector having a duckbill type check valve 4 mounted on the outer peripheral surface thereof. In this quick connector 3, one end portion (the left end portion in the drawing, which is the outflow side of a fluid such as fuel) 3a has a tip outer peripheral surface formed into a tapered tapered surface 5, and this tapered surface 5 A single annular groove 7 is formed on the outer periphery of the portion 6 following the. In addition, the outer periphery of the portion following the annular groove 7 forming portion 6 has 3
A strip retaining wedge 8a is provided so as to project in the circumferential direction, and the wedge surface portion 8
It is a (bamboo shoot-shaped retaining step). on the other hand,
On the inner peripheral surface of the central portion of the quick connector 3, a pair of left and right annular grooves 10 are formed, and O-rings 11 are fitted in both annular grooves 10. Further, the other end portion (the right end portion in the drawing, which is the fluid inflow side) 3b of the quick connector 3 is provided with a quick mechanism 9 utilizing a spring (not shown). The portion 9a is biased toward the center by the spring, and when the annular convex portion 2b of the metal pipe 2 passes through the convex portion 9a when the metal pipe 2 is engaged, the convex portion 9a resists the biasing force of the spring. When the diameter is increased and the annular convex portion 2b passes, the convex portion 9a is reduced in diameter by the urging force of the spring to prevent the annular convex portion 2b from coming off. Then, one end portion 1 a of the resin pipe 1 (the inner diameter of the resin pipe 1 is formed to be slightly smaller than the outer diameter of the annular groove 7 forming portion 6) is connected to the one end portion 3 of the quick connector 3.
When the resin pipe 1 is press-fitted into the outer peripheral surface a, the one end portion 1a of the resin pipe 1 moves to the inner side of the tapered surface 5 and the annular groove 7 forming portion 6 while expanding its diameter, and the annular wedge 8a of the wedge surface portion 8 prevents the resin pipe 1 from coming off. Fixed to. Meanwhile, connect the metal pipe 2 to the quick connector 3
When the other end 3b is press-fitted into the other end 3b, the one-touch operation causes the projection 9a of the quick mechanism 9 to fix the projection 2b protruding from the one end 2a of the metal pipe 2 in a retaining manner.

It should be noted that the check valve 4 allows the fluid to flow from the inflow side to the outflow side (from the right side to the left side in the drawing) and the outflow as shown in FIGS. 2 and 3. Check valve section (backflow prevention section) 13 for blocking the flow from the side to the inflow side (from the left side to the right side in the drawing)
And a tubular connecting portion 14 formed in a shape along the tapered surface 5 of the one end portion 3a of the quick connector 3 and the annular groove 7 forming portion 6 (a portion closer to the tapered surface 5 than the annular groove 7).
And O that fits into the annular groove 7 formed in the one end 3a.
That is, the ring portion (seal portion) 15 is connected in series. The check valve portion 13, the tubular connecting portion 14, and the O-ring portion 15 are integrally formed of fluorosilicone rubber. The check valve portion 13 is of a duck bill type, and more specifically, it is a disk-shaped body having a diameter substantially the same as the inner diameter of the resin pipe 1 (formed to cover the opening of the one end portion 3a of the quick connector 3). Is formed by projecting a mouth portion 16 that extends in a tapered shape from the central portion of the container toward the outflow side of the fluid. The mouth portion 16 includes a funnel-shaped portion 17 (see FIG. 2) having a regular square pyramid shape when viewed from the front, and the funnel-shaped portion 1
It comprises an opening / closing part 18 provided at the tip of 7. The opening / closing part 18
Is formed by forming a notch 18b penetrating along the fluid flow direction in the center of a rectangular horizontal plate 18a. Then, in the check valve portion 13, the funnel-shaped portion 17
When the fluid flows inside as shown by the arrow A (see FIGS. 1 and 3), the pressure of this fluid opens the notch 18b to open the valve (see FIGS. 4 and 5), and the funnel-shaped portion 17 When the fluid flows from the other side, the cut 18b is kept closed by the elastic closing force of the opening / closing portion 18 itself, and the valve is closed (see FIG. 6).

In the above structure, when the check valve 4 is attached to the one end portion 3a of the quick connector 3, the O-ring portion 15 of the check valve 4 is attached to the one end portion 3a of the quick connector 3.
The sides are faced to each other, and the check valve 4 is pushed in from that state. As a result, the O-ring portion 15 becomes
It is fitted into the annular groove 7 after being pushed in while expanding the diameter along the tapered surface 5 of a and the annular groove 7 forming portion 6. After the check valve 4 is attached to the one end portion 3a of the quick connector 3 in this manner, as shown in FIG. 1, the one end portion 1a of the resin pipe 1 is press-fitted into the outer periphery of the one end portion 3a and the other end portion 3b is pressed. The one end portion 2a of the metal pipe 2 is fitted inside. When the fluid flows from the inflow side to the outflow side in this state, as described above, the check valve portion 13 of the check valve 4 opens to allow the flow of the fluid to the outflow side, and When flowing from the outflow side to the inflow side, the check valve portion 13 of the check valve 4 is closed to prevent the fluid flow (backflow) to the inflow side.

As described above, in the above-described embodiment, since the check valve 4 is attached to the quick connector 3, the quick connector 3 can have a backflow preventing function.
Further, the O-ring portion 15 of the check valve 4 is attached to the quick connector 3
Since the resin pipe 1 protrudes from the annular groove 7 and the diameter of the corresponding portion of the resin pipe 1 is expanded, a retaining effect is obtained at this portion. Moreover, since the check valve 4 is configured by connecting the check valve portion 13 and the O-ring portion 15 in series, the number of parts is small and the O-ring portion 15 is small.
The check valve 4 can also be attached by attaching the. Further, the one end portion 1a of the resin pipe 1 is press-fitted into the one end portion 3a of the quick connector 3 in an external fitting manner, so that the both can be sealed. Moreover, even if the check valve 4 is attached to the quick connector 3 for a long period of time, the O-ring portion 15 will not be cracked due to the diameter expansion.

FIG. 7 shows another embodiment of the present invention. In this embodiment, in the quick connector 3 shown in FIG. 1, one end 3a is arranged on the fluid inflow side and the other end 3b is arranged on the outflow side. Further, as shown in FIG. 8, the check valve 20 attached to the one end portion 3a has the cylindrical connecting portion 14 in which the mouth portion 16 of the check valve 4 in FIG.
Toward the inside (in this embodiment, it means toward the outflow side of the fluid). The other parts are the same as those in the above embodiment, and the same parts are denoted by the same reference numerals.

Also in this embodiment, the same operation and effect as those of the above-mentioned embodiment are exhibited. Moreover, since the mouth portion 16 is disposed inside the tubular coupling portion 14, there is also an advantage that the lateral width of the check valve 20 is shortened and downsized.

FIG. 9 shows a quick connector 3 used in the present invention.
Shows a modified example of. In this modification, in the quick connector 3 shown in FIG. 1, of the two lateral side surfaces of the annular groove 7, the lateral side surface on the front end side is formed to have a small diameter (the outer diameter of this lateral side surface is opposite to that of the quick connector 3). With the stop valve 4 mounted, the outer diameter of the tubular connecting portion 14 of the check valve 4 is set to be slightly smaller than the inner diameter of the resin pipe 1),
Moreover, the tip side portion from the annular groove 7 is formed in a tapered shape whose diameter decreases toward the tip side. The tapered portion 22 is connected to the cylindrical surface portion 23 and the tip tapered surface portion 24. On the other hand, the check valve 4 has a cut 17a at the tip of the funnel-shaped portion 17. The other parts are the same as those of the quick connector 3 shown in FIG. 1, and the same parts are denoted by the same reference numerals. Even when this quick connector 3 is used, the same operation and effect as those of the connector device shown in FIG. 1 are achieved. Moreover, in this case, the outer diameter of the tubular connecting portion 14 of the check valve 4 is smaller than the inner diameter of the resin pipe 1 with the check valve 4 attached to the quick connector 3, so that when the resin pipe 1 is press-fitted. The slipperiness of the check valve 4 is improved.

FIG. 10 shows another modification of the quick connector 3. In this modification, in the quick connector 3 shown in FIG. 1, an R (R) processed surface 25 is provided instead of the tapered surface 5. On the other hand, the check valve 4 has a cut 17a at the tip of the funnel-shaped portion 17. The other parts are the same as those of the quick connector 3 shown in FIG. 1, and the same parts are denoted by the same reference numerals. Even when this quick connector 3 is used, the same operation and effect as those of the connector device shown in FIG. 1 are achieved. Moreover, in this type, the check valve 4 to the quick connector 3
Is easy to install, and the slipperiness of the check valve 4 when the resin pipe 1 is press-fitted is improved.

FIG. 11 shows another modification of the quick connector 3. In this modified example, in the quick connector 3 shown in FIG.
A strip annular groove 26 is formed. On the other hand, in the check valve 4, the O-ring portion 2 fitted in the annular groove 26 is formed on the inner peripheral surface of the tubular connecting portion 14 corresponding to the annular groove 26.
7 is projected. The other parts are the same as those of the quick connector 3 shown in FIG. 9, and the same parts are denoted by the same reference numerals. Even when this quick connector 3 is used, the same operation and effect as the connector device using the quick connector 3 shown in FIG. 9 can be obtained. Moreover, in this case, since the O-ring portion 27 of the check valve 4 is fitted in the annular groove 26 of the quick connector 3, there is an anti-slip effect,
Positional deviation can be prevented.

FIG. 12 shows a modification of the check valve 4.
In this modification, in the check valve 4 shown in FIG. 9, the thickness of the tubular connecting portion 14 is formed so as to gradually decrease from the tip side to the annular groove 7. The other parts are the same as the quick connector 3 and the check valve 4 shown in FIG. 9, and the same parts are denoted by the same reference numerals. Even when the quick connector 3 and the check valve 4 are used, the same operation and effect as those of the connector device shown in FIG. 1 can be obtained. Moreover, in this structure, the cylindrical connecting portion 14 is provided near the O-ring portion 15 of the check valve 4.
Is thin, the slipperiness of the check valve 4 when the resin pipe 1 is press-fitted is improved.

In each of the above embodiments, the quick connector 3 is used as the connector, but the connector is not limited to this, and screw-type connectors such as elbows and sockets, and mechanical types such as bite-type and packing-type mechanical connectors. Various things such as a type connector are used. Further, in each of the above-described embodiments, the O-ring is used as the annular seal portion, but a U packing, a V packing, a gland packing, or the like may be used instead of the O ring. Further, in each of the above embodiments, fluorosilicone rubber is used as the material of the check valve 4, but synthetic rubber such as fluororubber and nitrile rubber, or various synthetic resins may be used. Also, the resin pipe 1
As the material, polyamide 11 is used, but other single-layer and multi-layer pipes made of polyamide resin, fluororesin, etc. may be used. Further, in each of the above embodiments, the check valves 4 and 20 are attached to the quick connector 3, but a flow control valve, a safety valve, etc. may be attached.

[0023]

As described above, according to the connector device of the present invention, since the check valve is fixed to the connector, the connector itself can have a backflow preventing function. Moreover, in the state where the thick-walled seal portion having a circular cross- section is fixed to the annular groove of the connector, the outer peripheral portion of the thick-walled seal portion having a circular cross-section protrudes from the annular groove, and the protruding portion Since the part of the tubular body to be fitted is expanded,
This part also has the effect of preventing the pipe from coming off. Therefore, even if the engagement force between the retaining step of the coupling portion of the connector end portion and the tubular body is slightly weak, the retaining portion has a sufficient retaining effect due to the engagement between the seal portion and the enlarged diameter portion of the tubular body. As a result, the structure of the retaining step can be simplified, and it is not necessary to provide retaining means on the tubular body. Further, since the check valve has the seal portion integrated with it, the check valve 50 and the backflow preventing means 50 are provided as in the conventional example.
Compared to the ring 47 manufactured separately, the number of parts is reduced, and management such as inventory management can be simplified. further,
The check valve can be attached to the end of the connector simply by fixing the seal portion to the annular groove of the connector, and the check valve can be easily attached. That is, the work of fixing the seal portion to the annular groove also serves as the work of attaching the check valve to the connector, and the work of attaching the check valve can be omitted.

Further, in the present invention, the seal portion is O.
The ring has the following advantages. That is, by pressing the outer peripheral surface of the O-ring of the check valve fixed in the annular groove of the connector with the inner peripheral surface of the tubular body fitted onto the connector, the outer peripheral surface of the O-ring is moved to the inner peripheral surface of the tubular body. In addition to pressing and sealing, the inner peripheral surface of the O-ring can be pressed and sealed to the groove bottom surface of the annular groove, and one O-ring can seal at two places. The structure can be simplified compared to the conventional structure. Moreover, a tubular body whose inner diameter at one end is smaller than the outer diameter of the connector coupling portion is used to couple the two by pressing one end of the tubular body into the connector coupling portion.
Due to the press-fitting, one end of the tubular body may be expanded in diameter, and the dimensional accuracy of the peripheral surface may be reduced. However, in the present invention, even in such a case, the outer peripheral portion of the O-ring is inside the tubular body. Since it is in close contact with the peripheral surface, it can reliably seal. Even when the O-ring of the check valve is fitted into the annular groove of the connector in a retaining manner, a force for expanding the O-ring, such as the check valve of FIG. 17, almost acts on the O-ring. Therefore, in the present invention, even if the check valve is attached to the connector for a long period of time, the O-ring will not be cracked due to the diameter expansion. On the other hand, according to the check valve of the present invention, it is possible to obtain a connector having both a backflow prevention function and a sealing function, and a connector device having the above-mentioned excellent effects.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a connector device of the present invention.

FIG. 2 is a front view of a check valve.

FIG. 3 is a cross-sectional view of the check valve.

FIG. 4 is an explanatory view showing the action of the check valve.

FIG. 5 is an explanatory view showing the action of the check valve.

FIG. 6 is an explanatory view showing the action of the check valve.

FIG. 7 is a sectional view showing another embodiment of the present invention.

FIG. 8 is a sectional view of a check valve used in the other embodiment.

FIG. 9 is a cross-sectional view showing a modified example of the quick connector.

FIG. 10 is a sectional view showing another modification of the quick connector.

FIG. 11 is a sectional view showing still another modification of the quick connector.

FIG. 12 is a cross-sectional view showing a modified example of the check valve.

FIG. 13 is a cross-sectional view showing a conventional pipe connecting device.

FIG. 14 is a cross-sectional view of essential parts showing the operation of the pipe connecting device.

FIG. 15 is a sectional view of an essential part showing the operation of the pipe connecting device.

FIG. 16 is a cross-sectional view showing one mode of a check valve having an annular seal portion.

FIG. 17 is a cross-sectional view showing another mode of the check valve having the annular seal portion.

[Explanation of symbols]

1 resin pipe 3 quick connector 3a One end 4 Check valve 7 annular groove 15 O-ring part

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Miyake Fumiya, Komaki City, Aichi Prefecture 3500 Amagatsu, Kita Sotoyama, Tokai Rubber Industry Co., Ltd. Address Tokai Rubber Industry Co., Ltd. (72) Inventor Junya Ono 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (56) References Development 61-126182 (JP, U) Development 58 -97365 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 29/00-35/00

Claims (4)

(57) [Claims] 1. A connector, a coupling portion provided at an end portion of the connector, a synthetic resin tubular body externally fitted to an outer circumference of the coupling portion and coupled to the connector, and provided at an end portion of the connector. A connector device having a check valve provided therein, wherein an annular groove is provided around an outer periphery of a coupling portion of the connector, and the tubular body is prevented from coming off at a portion of the coupling portion on the inner side of the annular groove. Is equipped with a retaining step to hold the check valve
The duckbill tip part, the tubular part following it, and the end part of this tubular part, which is composed of a thick-walled seal part having a circular cross- section, and the check valve cylinder at the connector joint part. The seal portion of the check valve is fixed to the annular groove of the connector while the synthetic resin is attached to the seal portion of the check valve.
A connector device in which a fat tubular body is externally fitted . 2. The seal portion is an O-ring.
The described connector device. 3. A duckbill tip portion, a tubular portion following this, and a seal portion formed at the end portion of the tubular portion to have a thick cross-section with a circular cross section . The seal portion serves as a connector. ,
A check valve, which is fixed in a pinching state with a synthetic resin tubular body fitted onto the connector. 4. The seal portion is an O-ring.
Check valve described.