JP2002098283A - Connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector capable of easily connecting a positive pressure valve and a negative pressure valve to each other with compact structure. SOLUTION: This connector is provided with a first check valve 50 and a second check valve 60 in a cavity formed by a cylindrical first main body 10 and a cylindrical second main body 20 for cooperation with these main bodies. A cylindrical holding means 30 connected to one end of the second main body 20 for coaxial arrangement is provided with an engaging means 34 to be snap-engaged with an annular projection 41a of an insertion end 41 when inserting the insertion end 41 of a conduit 40 from one end opening of the holding means 30 into a fitting hole of the second main body 20. The first main body 10 is provided with a large diameter hole 11a at one end thereof with an inner diameter larger than that of a small diameter hole 12a provided in the other side thereof in order to provide an annular first valve seat 14 for the first check valve 50 at an intermediate part in the axial direction. Further, the fitting hole of the second main body 20 is formed so as to receive a tip of the insertion end 41 of the conduit 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector having a built-in check valve, and more particularly to a connector suitably used for a piping device for connecting a fuel tank and a canister of an automobile.

[0002]

2. Description of the Related Art Conventionally, as this kind of connector, for example, a connector described in Japanese Patent Application Laid-Open No. H8-312863 is known. The connector incorporating the check valve has an advantage that the check valve can be easily connected because the check valve is formed integrally with the connector. In recent years, various systems have been developed in which evaporated fuel generated in a fuel tank is adsorbed to a canister, and after the engine is started, the evaporated fuel in the canister can be effectively used.
In this system, after refueling is completed, the positive pressure valve is opened to prevent the pressure inside the fuel tank from rising, and after the engine is started, the fuel tank is purged immediately by evaporating the adsorbed fuel to negative pressure. Therefore, in order to prevent this, the negative pressure valve is opened.

However, in such a system, if a connector having the above-described conventional check valve is used, two connectors must be arranged in parallel. Therefore, there is a problem that the piping becomes complicated and the piping space becomes large.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a connector which can easily and compactly connect a positive pressure valve and a negative pressure valve.

[0005]

In order to achieve the above object, a structural feature of the first aspect of the present invention is that a cylindrical first body having a shaft hole extending from one end to the other end is provided. ,
A cylindrical second main body having a fitting hole and coaxially connected to one end of the first main body; and a coaxially provided one end of the second main body having an opening. A cylindrical holding means, and a straightly extending insertion end having an annular projection on the outer peripheral surface at a predetermined distance from the distal end. The insertion end is inserted through one end opening of the holding means, and the insertion end is A first body and / or a second body in a cavity formed by the first body and the second body, which can be inserted into the fitting hole of the second body. A first check valve and a second check valve configured in cooperation with the main body of the first check valve, wherein the first main body is located at an axially intermediate position of the first check valve. A large-diameter hole having an inner diameter larger than the other end on one end side and a small-diameter hole on the other end side adjacent to the large-diameter hole with respect to the intermediate position to provide the annular first valve seat. Elastic means that, when the holding means is inserted through the one end opening of the holding means and inserted into the fitting hole of the second body, the holding means snap-engages with the annular projection of the insertion end. Engaging means having a deformable portion which is deformable to a first valve seat in addition to the first valve seat.
Cylindrical valve body having a cylindrical portion slidable along a small-diameter hole of the main body, and an annular first contact portion protruding from an outer periphery of the cylindrical portion for contacting the first valve seat. And a first spring that urges the cylindrical valve body to bring the first contact portion into contact with the first valve seat, wherein the second check valve is a cylindrical valve body. An annular second valve seat formed on the inner peripheral surface of the second valve seat, and a second valve seat abutting on the second valve seat.
A contact portion and a second contact portion for bringing the second contact portion into contact with the second valve seat.
And a second spring biasing the contact portion.

According to the first aspect of the present invention, when the connection partner of the first main body becomes a positive pressure with respect to the connection partner of the conduit, the second check valve is switched to the second valve. The contact portion is in a closed state in contact with the second valve seat. However, as for the first check valve, the annular first contact portion has one end in the axial direction against the urging force of the first spring. To the open position by moving away from the first valve seat. Thereby, the first
Fluid flows from the connection partner of the main body to the connection partner of the conduit, and the positive pressure state of the connection partner of the first main body is eliminated.
On the other hand, when the connection partner of the conduit becomes positive pressure with respect to the connection partner of the first main body, the first check valve has an annular first contact portion of the cylindrical valve body with the first valve seat. Is closed by contact with the second check valve.
It moves toward the other end in the axial direction against the urging force of the spring and moves away from the annular second valve seat formed on the cylindrical valve body to enter the open state. Accordingly, fluid flows from the connection partner of the conduit to the connection partner of the first main body, and the positive pressure state of the connection partner of the conduit is eliminated.

That is, in this connector, the first check valve and the second check valve serve as a positive pressure valve and a negative pressure valve according to the pressure state of the connection partner of the first main body and the connection partner of the conduit. To work. And in this connector,
A first check valve and a second check valve are collectively disposed compactly in a cavity formed by the first body and the second body.

According to a second aspect of the present invention, in the connector according to the first aspect, the cylindrical portion of the first check valve is axially cut at a plurality of circumferential positions. A plurality of first sliding pieces that are cut out and extend from the vicinity of one end to the other end, and are provided at the other end of the second abutting portion of the second check valve at a plurality of locations in the circumferential direction in the axial direction. And a plurality of second sliding pieces provided between the first sliding pieces and extending between the first sliding pieces. It is a moving surface.

According to the second aspect of the present invention, the small-diameter hole of the first main body is formed by the first sliding piece of the first check valve and the second sliding piece of the second check valve. Since the sliding surface is a common sliding surface, the sliding surface that requires high-precision processing for smoothly sliding the first sliding piece and the second sliding piece can be integrated into one place. .

[0010] The structural feature of the third aspect of the present invention is the connector according to the first or second aspect.
Each contact surface where the first valve seat and the first contact portion abut and / or each contact surface where the second valve seat and the second contact portion abut each have a curved surface shape and are in close contact with each other. It is possible to abut.

According to the third aspect of the present invention, each contact surface where the first valve seat and the first contact portion abut or each contact surface where the second valve seat and the second contact portion abut. Since the contact surfaces have a curved shape and can contact each other in close contact with each other, the area where the first valve seat and the first contact portion abut or the second valve seat and the second contact portion abut. A large area, that is, a seal area is secured.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 8 show a connector according to the first embodiment. The connector is
A first cylindrical main body 10, a second cylindrical main body 20 coaxially connected to one end 11 of the first main body 10, and one end 21 of the second main body 20. And a male connector having an insertion end 41 having an annular projection 41a on the outer peripheral surface at a distance from the distal end while having a female connector element comprising a cylindrical holding means 30 coaxially connected to the tubular connector. Conduit 40 is provided. Further, the first main body 10 and / or the first main body 10 are placed in a cavity formed by the first main body 10 and the second main body 20.
Alternatively, in cooperation with the second main body 20, a first check valve 50 capable of flowing fluid only to one side and a second check valve 60 capable of flowing fluid only to the other side, which will be described later, are provided. Has been established. The first main body 10, the second main body 20, and the holding means 30 are injection-molded with a resin such as polyamide or polyacetal. The conduit 40 is made of resin or metal.

The first main body 10 has a shaft hole extending from one end to the other end, and has a first check valve 50 at an intermediate position in the axial direction.
In order to provide an annular first valve seat 14, the one end 11
A large-diameter hole 11a having an inner diameter larger than the other end and a small-diameter hole 1 adjacent to the large-diameter hole 11a at the other end inward in the axial direction.
2a. The second main body 20 is formed with a fitting hole suitable for receiving the distal end 41 b of the insertion end 41 of the conduit 40. As shown in FIG. 3, the fitting hole includes a first hole 21a formed on one end side and a second hole 22a formed on the other end side.
A ring-shaped seal member 29, such as an O-ring, is inserted into the first hole 21a. Then, the insertion end 41 of the conduit 40 is inserted through one end opening of the cylindrical holding means 30, and the distal end of the insertion end 41 can be inserted and engaged with the second hole 22a, and the conduit 40 is connected to the second hole 22a. It is supported concentrically on the body 20. At this time, the outer peripheral surface of the distal end portion 41b of the insertion end portion 41 engages with the inner peripheral surfaces of the seal members 29, 29, and the second main body 20 and the conduit 4
The space between 0 is sealed in a fluid-tight manner.

A cylindrical holding means 30 coaxially connected to one end of the second main body 20 has a large-diameter cylindrical portion 31 formed at one end thereof and one end of the large-diameter cylindrical portion 31. The insertion end 41 of the conduit 40 is inserted through the opening, and when the tip of the insertion end 41 is inserted into the second hole 22a, it is elastically deformable to snap-fit with the annular projection 41a of the insertion end 41. And two engagement arms 34 each having a deformable portion extending in the circumferential direction.

The first check valve 50 slightly protrudes from the radially extending annular surface formed between the large-diameter hole 11a and the small-diameter hole 12a of the first main body 10 toward one end in the axial direction. An annular first valve seat 14 is formed, a cylindrical portion 52 slidable along the small-diameter hole 12a of the first main body 10, and an outer periphery of one end of the cylindrical portion 52 for contacting the first valve seat 14. A cylindrical valve element 51 integrally provided with an annular first contact portion 53 formed of a projecting annular flange, and a first valve seat 1 provided with the first contact portion 53.
4 and a first spring 54 that urges the valve element 51 to make contact with the first spring 54. Here, FIG.
And a plurality of first notches 5 in the circumferential direction as shown in FIG.
2a is provided, and when the valve element 51 is opened, the first
The fluid on the side of the flow hole 13a of the main body 10 can easily flow from the small-diameter hole 12a to the large-diameter hole 11a. A first notch 52a is provided on the outer peripheral edge of the first contact portion 53.
The second notch 53a is provided so that the fluid flows into the second main body 20 from the second.

A second check valve 60 includes a second annular valve seat 55 extending in the radial direction formed on an inner peripheral surface of one end of a cylindrical valve body 51 of the first check valve 50. A cap-shaped second contact portion 61 disposed in the valve body 51 and in contact with the second valve seat 55
And a second spring 62 for urging the second contact portion 61 so that the second contact portion 61 contacts the second valve seat 55.

More specifically, the first main body 10
Is a small-diameter end portion 13 formed at the other end with a smaller diameter than the one end side.
It has. A plurality of annular projections are formed on the outer peripheral surface of the small-diameter end portion 13, and the end portion of the resin tube 19 is press-fitted into the outer peripheral surface of the small-diameter end portion 13 so as to be integrally prevented from coming off. . The small diameter end portion 13 is provided with a flow hole 13a smaller than the small diameter hole 12a. An annular surface 12b extending in the radial direction is formed at the boundary between the small diameter hole 12a and the flow hole 13a. A second spring 62 is arranged in a compressed state between the annular surface 12b and the second contact portion 61, and receives the opposed end of the compressed second spring 62 on the annular surface 12b. An annular flange 15 protruding radially outward is provided at one end of the first main body 10, and a plurality of circumferential grooves 1 are formed on the surface of the flange 15.
5a is provided.

As shown in FIG. 3, a second cylindrical body 20 extending from one end to the other end includes a first end 21 having the first hole 21a at one end, and a second end 20 having the first hole 21a at the other end. Is provided with a second end portion 22 having the second hole 22a, and an annular flange portion 23 protruding radially outward on an outer periphery of a boundary between the first end portion 21 and the second end portion 22. Is provided. The first end portion 21 has four engagement projections 21b protruding radially outward at intervals in the circumferential direction on the outer peripheral surface of one end thereof.
Is provided. The second end portion 22 is formed with a notch groove 26a extending in the axial direction at intervals in the circumferential direction on the outer peripheral surface thereof, and a number of ridges 26 are formed.
At the other end of the second end portion 22, a number of slots 27 are formed on the extension of the notch groove 26a.

On the back surface (the surface on the other end side) of the annular flange portion 23, a space between the outer peripheral surface of the second end portion 22 inserted into the large-diameter hole 11a of the first main body 10 is provided. Ring-shaped groove 2
A relatively short axially extending tubular portion 24 disposed concentrically with the second end portion 22 across the first end portion 4a; and a concentrically disposed circumferential groove 25a between the tubular portion 24 and the cylindrical portion 24. And a ring-shaped protrusion 25 protruding in the axial direction.

Then, the first main body 10 and the second main body 20
Means that the cylindrical portion 24 of the second main body 20 extending in the axial direction
Is inserted into the large-diameter hole 11a of the main body 10 of the second main body 20.
Is ultrasonically welded so that the back surface of the annular flange portion 23 contacts the surface of the flange portion 15 formed at one end of the first main body 10. At this time, the end of the second end 22 and the first main body 1 are moved so that the valve body 51 can move in the axial direction.
An axial space is provided between the first valve seats 14 formed at zero. The first spring 54 is disposed in a compressed state between the bottom surface of the ring-shaped groove 24 a and the first contact portion 53 of the valve body 51.

As shown in FIGS. 1 and 2, the holding means 30 is provided at one end with a large-diameter cylindrical portion 31 having annular flanges 31a and 31b on both sides, and at the other end on the other side. Collar 31
A small-diameter cylindrical portion 32 is formed adjacent to b, and four locking portions 33 are formed on the outer periphery of the small-diameter cylindrical portion 32 at intervals in the radial direction with a circumferential gap. Each of the four locking portions 33 has a U-shaped window 33a. The holding means 30 has a small-diameter cylindrical portion 32 inserted into the first end 21 of the second main body 20 and a central portion in the circumferential direction of a U-shaped window 33 a formed in the locking portion 33. Are formed at one end of the first end 21 of the second main body 20 by four engagement projections 21 formed on the outer peripheral surface.
b is connected to the second main body 20 by snap engagement.

As shown in FIG. 6, the large-diameter cylindrical portion 31 is provided with two engaging arms 34 having elastically deformable circumferentially extending deformable portions. That is,
As shown in FIGS. 1 and 2, the two engagement arms 34
Annular flanges 3 facing each other with an interval in the axial direction
1a, 31b The respective circumferential cutouts 34a, 34b provided on the same circle adjacent to the inside
And an axial cutout (not shown) connecting the cutouts 34a and 34b in the circumferential direction to form a window. At the free end of each engaging arm 34, an arc-shaped engaging claw 34c having a guide surface for snapping the annular protrusion 41 of the conduit 40 is provided. Therefore, when the insertion end 41 of the conduit 40 is inserted through one end opening of the large-diameter cylindrical portion 31 and the tip of the insertion end 41 is inserted into the second hole 22a, the annular projection of the insertion end 41 is formed. 41a and the conduit 4
0 can be connected to the female elements 10, 20, 30 with substantially the first check valve 50 and the second check valve 60.

In this embodiment, the holding means 30 is formed of a member independent of the second main body 20, but may be formed integrally with the second main body 20. In this case, it is preferable to use an independent bush instead of the small-diameter cylindrical portion 32. The engaging arm 34 is formed integrally with the cylindrical portion 31. However, such a known member as a retaining member described in JP-A-6-221486 and a retainer described in JP-A-5-196184 is used. The present invention can be constituted by adopting the engaging means and detachably attaching to the cylindrical portion.

Next, the operation of the connector of the present embodiment will be described based on an example in which the connector is employed between a fuel tank and a canister of an automobile. A connector provided with a female element is connected to a conduit 40 as a male element fixed to an inlet of a canister (not shown), and the other end of the resin tube 19 fixed to the connector is connected to a rollover valve at an outlet of a fuel tank. (Not shown). When there is no pressure difference between the fuel tank and the canister, as shown in FIG. 2, the first check valve 50 is pushed by the first spring 54 to abut the first valve seat 14 and the second check valve Stop valve 6
Numeral 0 is pushed by the second spring 62 and is in contact with the second valve seat 55, and both are in a closed state.

When the internal pressure of the fuel tank rises, as shown in FIG. 7, a positive pressure acts in the direction of the arrow from the resin tube 19 side, and the second contact portion 61 is inevitably formed in the second valve body 51 formed on the valve body 51. While the second check valve 60 is closed by being pressed against the valve seat 55, a positive pressure acts on the valve body 51 by closing the second check valve 60, and as shown in FIG. 1 spring 54
, The valve element 51 moves to one end side, and the first check valve 50 opens. Then, as shown by the arrow, it passes through the second notch 53a and the many slots 27 formed at the other end of the second end portion 22 of the second main body 20, and passes through the conduit 40 from the resin tube 19 side. The fluid flows into the fuel tank, thereby suppressing an increase in the internal pressure of the fuel tank.

When the pressure inside the fuel tank becomes negative, as shown in FIG.
Is in contact with the first valve seat 14 by the first spring 54 and the first check valve 50 is closed, so that the second contact portion 61 overcomes the second spring 62 due to the negative pressure and is attracted to the other side. Then, the second check valve 60 is opened. As a result, the air on the conduit 40 side passes through the hole formed in the second valve seat 55 and then passes through the first notch 52a formed in the cylindrical portion 52 of the valve body 51 as shown by the arrow. Then, the fuel flows into the fuel tank through the resin tube 19, and the negative pressure in the fuel tank is reduced.

As described above, the connector according to the present embodiment cooperates with the first and second cylindrical main bodies 10 and 20 to form the connector inside the first and second main bodies 10 and 20. The first check valve 50 and the second check valve 60 are coaxially housed in the valve body 51 and the second contact portion 61 is concentrically housed in the valve body 51. Can be connected compactly.

Next, a second embodiment will be described with reference to FIGS. In the present embodiment, the first
In this embodiment, the structure of the first check valve and the second check valve is changed. The first check valve 70 has a structure in which a valve body 71 is different from the first check valve 50. As shown in FIGS. 10 and 11, the valve body 71 includes a cylindrical portion 72 slidable along the small-diameter hole 12 a of the first main body 10 and a cylindrical portion 72 for abutting on the first valve seat 14. An annular first flange including an annular flange protruding from one end of the outer periphery;
The contact portion 73 is provided.

The cylindrical portion 72 is a plurality of first sliding pieces extending in the axial direction from a plurality of circumferential locations at the other end of the first contact portion 73, and is provided between the first sliding pieces. Are a plurality of notches 72a. Therefore, when the valve body 71 is opened, the first
The fluid in the flow hole 13a of the main body 10 can easily flow from the small-diameter hole 12a to the large-diameter hole 11a through the notch 72a. Also, the first contact portion 73 has an outer diameter smaller than the outer diameter of the first contact portion 53, and therefore, a large gap is provided between the outer peripheral edge and the large-diameter hole 11a. The fluid can be circulated smoothly. Therefore, the notch provided in the first contact portion 53 is not provided on the outer peripheral edge of the first contact portion 73. Further, the first contact portion 73 has a contact surface side with the first valve seat 14,
An annular projection 74 having a wedge-shaped cross section with a sharp tip protruding toward the first valve seat 14.

The second check valve 80 is an annular concave curved surface extending in the radial direction formed on the inner peripheral surface at one end of the cylindrical valve body 71 of the first check valve 70. A seat 75, a cap-shaped second contact portion 81 that contacts the second valve seat 75,
The second spring 62 biases the second contact portion 81 so that the contact portion 81 contacts the second valve seat 75. As shown in FIG. 12 and FIG.
It is a substantially hemispherical cap-shaped abutting part, which slightly extends radially outward from four circumferential locations at the circular open end (the other end) of the abutting part, and is bent at the tip end side. A sliding portion 82 composed of a plurality of second sliding pieces extending in the axial direction is provided integrally. The outer diameter of the sliding portion 82 is substantially the same as the outer diameter of the cylindrical portion 72, and is arranged coaxially so as to be located between the notches 72a of the cylindrical portion 72. The main body 10 is slidable along the small-diameter hole 12a.

According to the second embodiment, since the force applied to the other end in the axial direction applied to the valve body 71 is concentrated on the tip of the projection 74, the tightness between the projection 74 and the first valve seat 14 is maintained. Contact is ensured. As a result, the sealing performance between the valve body 71 and the first valve seat 14 is improved. In addition, the small-diameter hole 1 of the first main body 10
2a is a common sliding surface of the first sliding piece of the cylindrical portion 72 of the first check valve 70 and the sliding portion 82 of the second check valve 80. A sliding surface that requires high-precision processing for smoothly sliding the portion 82 can be collected at one place. As a result, the structure of the connector can be made compact, and the manufacturing cost can be reduced.

Next, a third embodiment will be described with reference to FIGS.
This will be described with reference to FIG. Also in this embodiment, the first check valve and the second check valve are different from the first and second embodiments.
The structure of the check valve is changed. First check valve 9
0 is the first valve seat 17 with respect to the first check valve 50.
And the valve body 91 have different structures, and the first spring 54 is the same. As shown in FIG. 14, the first valve seat 17 protrudes from the vertical inner wall surface at the boundary between the large-diameter hole 11a and the small-diameter hole 12a toward one end, and the distal end surface extends from one end to the other end. The inside diameter is small, and the cross section is a concave curved surface having an arc shape.

As shown in FIGS. 15 and 16, the valve body 91 has a cylindrical portion 92 slidable along the small-diameter hole 12a of the first main body 10 and a cylindrical portion for contacting the first valve seat 17. An annular first flange formed of an annular flange protruding from the outer periphery of one end of the portion 92;
A contact portion 93 is provided. The cylindrical portion 92 includes a first contact portion 93.
Are formed at a plurality of first sliding pieces extending in the axial direction from a plurality of locations in the circumferential direction, and a plurality of notches 92a are formed between the first sliding pieces. The outer diameter of the first contact portion 93 is substantially the same as the outer diameter of the outer peripheral surface of the first valve seat 17.
The outer peripheral portion is a convex curved surface 93a having a curvature corresponding to the concave curved surface 17a at the tip of the first valve seat 17, and the first valve seat 17
, The convex curved surface 93 a comes into close contact with the concave curved surface of the first valve seat 17.

The second check valve 100 has substantially the same structure as that of the second check valve 80. The second check valve 100 has an annular second check valve provided on a cylindrical valve body 91 of the first check valve 90. A second valve seat 95, a cap-shaped second contact portion 101 that contacts the second valve seat 95,
The second contact portion 101 is brought into contact with the second valve seat 95 by the second
The second spring 62 biases the contact portion 101. The second abutting portion 101 is a substantially hemispherical cap-shaped abutting portion, and a protruding piece 10 slightly extending in a radial direction from four circumferential positions at the circular open end of the abutting portion.
2a and a sliding portion 102 composed of a plurality of second sliding pieces 102b bent at the tip end side of the protruding piece 102a and extending in the axial direction.
Is provided. The sliding portion 102 has the same outer diameter as the cylindrical portion 92, and the second sliding piece 102 b is
The outer peripheral surface of the first main body 10 is slidable along the small-diameter hole 12a.

According to the third embodiment, the first valve seat 1
Since the area where the first contact portion 93 and the first contact portion 93 come into contact with each other, that is, the sealing area is widened, the sealing effect is enhanced. Also,
Since each contact surface is merely a curved surface, there is no need to increase the space for increasing the seal area. Further, since the contact surfaces are curved surfaces, the two check valves 90,
The displacement of the check valve 100 in the radial direction is corrected, and the axial movement of the check valve is performed stably. Also, the first main body 10
The small-diameter hole 12a of the first check valve 90
The effect of having a common sliding surface between the sliding piece and the second sliding piece 102b of the sliding portion 102 of the second check valve 100 has been described in the second embodiment. It is on the street.

The same effect can be obtained by connecting the connector to the tank side, that is, the rollover valve side, contrary to the above embodiment. In addition, the connector shown in the above embodiment is merely an example, and can be implemented in various forms without departing from the gist of the present invention.

[0037]

According to the first aspect of the present invention, in this connector, the first check valve and the second check valve are provided in the cavity formed by the first main body and the second main body. Since they are compactly arranged together, the piping can be simply configured,
Furthermore, there is no need to expand the piping space.

According to the second aspect of the present invention, the first
The small-diameter hole of the main body is a common sliding surface of the first sliding piece of the first check valve and the second sliding piece of the second check valve, and requires high-precision processing. Since the sliding surface can be integrated into one place, the structure of the connector can be made compact,
The manufacturing cost can be reduced.

According to the third aspect of the present invention, the first
Since the area where the valve seat and the first contact portion abut or the area where the second valve seat and the second contact portion abut, that is, the sealing area is widened, the sealing effect of each check valve is enhanced.
In addition, since each contact surface is merely a curved surface, there is no need to increase the space for increasing the sealing area. further,
Since the contact surfaces are curved surfaces, the radial displacement of the check valve is corrected, and the axial movement of the check valve is performed stably.

[Brief description of the drawings]

FIG. 1 is a front view showing a connector according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the connector at an axial position in FIG. 1;

FIG. 3 is a sectional view showing a second main body constituting the connector.

FIG. 4 is a front view showing a valve body.

FIG. 5 is a sectional view taken along a line VV in FIG. 2;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 2;

FIG. 7 is a cross-sectional view illustrating an operation mode when a fluid flows from the resin tube side to the conduit side.

FIG. 8 is a cross-sectional view illustrating an operation mode when a fluid flows from the conduit side to the resin tube side.

FIG. 9 is a cross-sectional view of the connector according to the second embodiment at an axial position.

FIG. 10 is a front view showing a valve body of the connector.

FIG. 11 is a cross-sectional view of the valve body of the connector at an axial position.

FIG. 12 is a front view showing a valve body of the connector.

FIG. 13 is a cross-sectional view of the valve body of the connector at an axial position.

FIG. 14 is a cross-sectional view at an axial position showing a connector according to a third embodiment.

FIG. 15 is a front view showing a valve body of the connector.

FIG. 16 is a cross-sectional view of the valve body of the connector at an axial position.

FIG. 17 is a front view showing a valve body of the connector.

FIG. 18 is a cross-sectional view of the valve body of the connector at an axial position.

[Explanation of symbols]

10: first body, 11a: large-diameter hole, 12a: small-diameter hole,
14 first valve seat, 20 second body, 21 first end, 22 second end, 30 holding means, 31 large-diameter cylinder, 32 small-diameter cylinder, 33 Locking portion, 34: engagement arm portion, 40: conduit, 41: insertion end portion, 50: first check valve, 51: valve body, 51a: cylindrical portion, 51b: first contact portion,
52: a first spring, 60: a second check valve, 61: a second contact portion, 62: a second spring, 70: a first check valve, 71 ...
Valve body, 72 ... cylindrical part, 73 ... first contact part, 75 ... second valve seat, 80 ... second check valve, 81 ... second contact part, 82 ... sliding part, 90 ... first Check valve, 91 ... valve element, 92 ... cylinder part,
93: first contact portion, 95: second valve seat, 100: second check valve, 101: second contact portion, 102: sliding portion.

Claims (3)

[Claims] 1. A first cylindrical main body having a shaft hole extending from one end to the other end, a first main body having a fitting hole, and coaxially connected to one end of the first main body. A second cylindrical main body; a cylindrical holding means having one end opening and provided coaxially on one end side of the second main body; and an annular projection formed on an outer peripheral surface at a predetermined distance from a distal end. A straight-through insertion end portion having an insertion end portion, the insertion end portion can be inserted through one end opening of the holding means, and the tip end portion of the insertion end portion can be inserted into a fitting hole of the second main body. A first conduit configured in cooperation with the first body and / or the second body in a cavity formed by the tubular conduit and the first body and the second body. A connector comprising a stop valve and a second check valve, wherein the first main body has an axially intermediate position of the first check valve. A large-diameter hole having an inner diameter larger than the other end at one end side with respect to the intermediate position, and a small-diameter hole at the other end side adjacent to the large-diameter hole for providing the first valve seat having the shape of Means for inserting the insertion end through one end opening of the holding means,
An engagement means having an elastically deformable deformable portion that snap-engages with the annular projection of the insertion end when inserted into the fitting hole of the main body of the first checker. A valve in addition to the first valve seat;
A cylindrical portion slidable along the small-diameter hole of the main body, and an annular first contact portion protruding from an outer periphery of the cylindrical portion for contacting the first valve seat. A valve body, and a first spring for urging the cylindrical valve body to bring the first contact portion into contact with the first valve seat, wherein the second check valve is An annular second valve seat formed on the inner peripheral surface of the cylindrical valve body, a second contact portion that contacts the second valve seat, and the second contact portion is connected to the second valve seat. A second spring biasing the second contact portion to contact the second contact portion. 2. The first check valve according to claim 1, wherein the first check valve includes a plurality of first sliding pieces which are axially notched at a plurality of positions in a circumferential direction and extend from near one end to the other end. The second
The other end of the second contact portion of the check valve is provided with a plurality of second sliding pieces extending in the axial direction from a plurality of locations in the circumferential direction and disposed between the first sliding pieces. The connector according to claim 1, wherein the small-diameter hole of the first main body forms a common sliding surface for the first sliding piece and the second sliding piece. 3. A contact surface between the first valve seat and the first contact portion and / or a contact surface between the second valve seat and the second contact portion is a curved surface. The connector according to claim 1 or 2, wherein the connector has a shape and can be brought into contact with each other in a state of being in close contact with each other.