Joint for tube

Abstract

To provide a joint for tube capable of suppressing liquid leakage at the time of separation.SOLUTION: A joint 20 for tube for linking and connecting tubes where a liquid flows includes a male type connector 1 and a female type connector 2. In the case where the male type connector is inserted in the female type connector, a first pressing member 9 and a second pressing member 13 are made to come into contact with each other, the first pressing member is energized by a first spring 7, and the second pressing member is energized by a second spring 11, a first outer peripheral member 10 and a first seal member 8, and a second outer peripheral member 19 and a second seal member 12 come into contact with each other respectively, and it comes into a closed state where a flow passage between a first pipe 16 and a second pipe 17 are closed. In the case where the first spring and the second spring are compressed, the first and second outer peripheral members are separated from the first seal member and the second seal member, and it comes into an open state where the flow passage between the first pipe and the second pipe are opened. The outer diameter of the second seal member is smaller than the outer diameter of the first seal member.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] SUMMARY The present disclosure relates to a tubing fitting having matable male and female connectors. [Background technology]

[0002] A known quick connect valve assembly is comprised of a male connecting member, a female connecting member, first and second poppet members, first and second sealing members, and a clip means (see, for example, Patent Document 1). In this quick connect valve assembly, each poppet member of the male and female connecting members is movable in the axial direction, and their tips protrude from the housing member and taper as they move away from each other in the axial direction. A liquid seal member that forms a maximum diameter at the tip is provided between the poppet member and the housing member, and the fluid flow is guided along the maximum diameter. This structure reduces the stroke required until the fluid is sealed when disconnecting, allowing for quick disconnection. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3482496 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the quick connect valve assembly has a problem in that a large space for liquid to remain between the first and second sealing members between the male and female connecting members occurs, resulting in a large amount of liquid leakage when the male and female connecting members are separated.

[0005] An object of the present disclosure is to provide a tube fitting that can suppress liquid leakage when disconnected. [Means for solving the problem]

[0006] The tube joint according to the present disclosure is a tube joint for connecting and coupling tubes through which a fluid flows, and includes a male connector having a first tube through which the fluid flows inside and an insertion portion that is convex in an axial direction that is an insertion direction, and a female connector having a second tube through which the fluid flows inside and having an inserted portion that is concave in the axial direction into which the insertion portion is inserted and coupled, the insertion portion including a first pressing member that is convex in the axial direction and that is biased outward in the axial direction by a first spring when the male connector is not inserted into the female connector, and a first pressing member that is convex in the axial direction and that is biased outward in the axial direction by a first spring when the male connector is not inserted into the female connector. and a first outer peripheral member that supports the first spring in the axial direction, is spaced apart from the first pressing member and surrounds the axial periphery in an annular shape, and comes into contact with the first sealing member to close the flow path between the first tube and the second tube when the first spring is biasing the first pressing member, and is spaced apart from the first sealing member to open the flow path between the first tube and the second tube when the first spring is compressed. The inserted portion is moved outward in the axial direction by the second spring when the male connector is not inserted into the female connector. a second pressing member having an axially convex shape and biased by a second spring, the second pressing member being biased to come into contact with the first pressing member when the male connector is inserted into the female connector; a second annular sealing member disposed around the second pressing member; and a second outer peripheral member being biased by a second spring, the second outer peripheral member being biased to come into contact with the second sealing member when the male connector is not inserted to close the flow path between the first tube and the second tube, and being separated from the second sealing member when the second spring is compressed to open the flow path between the first tube and the second tube. and the second pressing member are in contact with each other, the first pressing member is biased by the first spring, and the second pressing member is biased by the second spring, the first outer peripheral member and the first sealing member, and the second outer peripheral member and the second sealing member are in contact with each other, respectively, resulting in a closed state in which the flow path between the first tube and the second tube is closed; when the first spring and the second spring are compressed, the first and second outer peripheral members are separated from the first sealing member and the second sealing member, resulting in an open state in which the flow path between the first tube and the second tube is open, and the outer diameter of the second sealing member is smaller than the outer diameter of the first sealing member. [Effects of the Invention]

[0007] According to the tube fitting of the present invention, the outer diameter of the second seal member is smaller than the outer diameter of the first seal member, so that leakage during separation can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic perspective view showing the appearance of a tube fitting according to a first embodiment in an open state in which a flow path is open. FIG. [Figure 2] 2 is a cross-sectional view of the tube fitting in a state where the flow path of FIG. 1 is open, taken from a direction perpendicular to the axial direction. [Figure 3] 1 is a schematic perspective view showing the appearance of the tube fitting according to the first embodiment in a closed state in which a flow path is closed. FIG. [Figure 4] 4 is a cross-sectional view of the tube fitting in a state in which the flow path of FIG. 3 is closed, taken from a direction perpendicular to the axial direction. [Figure 5] 1 is a schematic perspective view showing a state before the male connector of the tube joint according to Embodiment 1 is inserted into the female connector. FIG. [Figure 6A] 10 is a cross-sectional view of a female connector of a first modified example of the tube joint according to the first embodiment, viewed from the axial direction. FIG. [Figure 6B] 10 is a cross-sectional view of a male connector of a first modified example of the tube fitting according to the first embodiment, viewed from the axial direction. FIG. [Figure 7] FIG. 10 is a schematic perspective view showing the appearance of a tube fitting according to Modification 2 of Embodiment 1 in an open state in which the flow path is open. DETAILED DESCRIPTION OF THE INVENTION

[0009] A tube joint according to a first aspect is a tube joint for connecting and coupling tubes through which a fluid flows, and includes a male connector having a first tube through which the fluid flows inside and an insertion portion that is convex in the axial direction, which is the insertion direction, and a female connector having a second tube through which the fluid flows inside and having an insertion receiving portion that is concave in the axial direction, into which the insertion portion is inserted and coupled, wherein the insertion portion has a first pressing member that is convex in the axial direction and is biased axially outward by a first spring when the male connector is not inserted into the female connector, and The connector has a first annular seal member disposed around the first pressing member, and a first outer peripheral member that supports the first spring in the axial direction, is spaced apart from the first pressing member and surrounds the axial periphery in an annular shape, and comes into contact with the first seal member to close the flow path between the first tube and the second tube when the first spring is biased, and is spaced apart from the first seal member to open the flow path between the first tube and the second tube when the first spring is compressed. The inserted portion is configured such that when the male connector is not inserted into the female connector, the second spring causes the first outer peripheral member to be spaced apart from the first seal member to open the flow path between the first tube and the second tube. a second pressing member that is axially convex and biased by a second spring, and that abuts against the first pressing member when the male connector is inserted into the female connector; a second annular sealing member that is disposed around the second pressing member; and a second outer peripheral member that is biased by a second spring, and that abuts against the second sealing member to close the flow path between the first tube and the second tube when the male connector is not inserted, and that moves away from the second sealing member to open the flow path between the first tube and the second tube when the second spring is compressed. When the outer peripheral member and the second pressing member are in contact with each other, the first pressing member is biased by the first spring, and the second pressing member is biased by the second spring, the first outer peripheral member and the first sealing member, and the second outer peripheral member and the second sealing member, respectively, are in contact with each other, resulting in a closed state in which the flow path between the first tube and the second tube is closed; when the first spring and the second spring are compressed, the first and second outer peripheral members are separated from the first sealing member and the second sealing member, resulting in an open state in which the flow path between the first tube and the second tube is open; and the outer diameter of the second sealing member is smaller than the outer diameter of the first sealing member.

[0010] A tube fitting according to a second aspect is the first aspect, wherein the outer diameter of the first pressing member to the second pressing member between the first seal member and the second seal member may be tapered from the outer diameter of the first seal member to the outer diameter of the second seal member.

[0011] The tube fitting according to the third aspect may be the first or second aspect, further comprising an external sealing member that seals between the first and second outer peripheral members and the annular outer peripheral member of the female connector that surrounds the outer peripheries of the first and second outer peripheral members.

[0012] Hereinafter, a tube joint according to an embodiment will be described with reference to the accompanying drawings, in which substantially identical components are designated by the same reference numerals.

[0013] (Embodiment 1) Fig. 1 is a schematic perspective view showing the appearance of a tube fitting 20 according to embodiment 1 in an open state with the flow path 18 open. Fig. 2 is a cross-sectional view of the tube fitting 20 in Fig. 1 with the flow path 18 open, taken from a direction perpendicular to the axial direction. Fig. 3 is a schematic perspective view showing the appearance of the tube fitting 20 according to embodiment 1 in a closed state with the flow path closed. Fig. 4 is a cross-sectional view of the tube fitting in Fig. 3 with the flow path closed, taken from a direction perpendicular to the axial direction. Fig. 5 is a schematic perspective view showing the tube fitting 20 according to embodiment 1 in a state before the male connector 1 is inserted into the female connector 2. For convenience, the axial direction, which is the insertion direction, is defined as the X direction, one direction in a horizontal plane perpendicular to the X direction is defined as the Y direction, and the vertically upward direction is defined as the Z direction.

[0014] The tube fitting 20 according to the first embodiment is a tube fitting for connecting and joining tubes (not shown) through which a fluid flows. The tube fitting 20 comprises a male connector 1 and a female connector 2.

[0015] Each of the components that make up this tube joint 20 will be described below.

[0016] <Male connector> Male connector 1 has first tube 16 inside through which fluid flows, and has insertion portion 22 that is convex in the axial direction (X direction), which is the insertion direction. It also connects to a tube at tube connection portion 6 at the end. Fluid flows from the tube into first tube 16.

[0017] <insertion part> The insertion portion 22 is convex in the axial direction (X direction), and includes a first pressing member 9, a first sealing member 8, and a first outer peripheral member .

[0018] <First pressing member> The first pressing member 9 is convex in the axial direction, and is biased outward in the axial direction (X direction) by the first spring 7 when the male connector 1 is not inserted into the female connector 2.

[0019] <First sealing member> The first seal member 8 is annular and is disposed around the first pressing member 9. For example, an O-ring can be used.

[0020] <First peripheral member> The first outer peripheral member 10 supports the first spring 7 in the axial direction (X direction), and is spaced apart from the first pressing member 9 to surround the periphery in the axial direction (X direction) in an annular shape. Furthermore, when the first pressing member 9 is biased by the first spring 7, the first outer peripheral member 10 comes into contact with the first seal member 8 to close the flow path 18 between the first tube 16 of the male connector 1 and the second tube 17 of the female connector 2. This results in a closed state. On the other hand, when the first spring 7 is compressed, the first outer peripheral member 10 moves away from the first seal member 8, opening the flow path 18 between the first tube 16 and the second tube 17. This results in an open state. The first outer peripheral member 10 is connected to the first pressing member 9 via the first spring 7, and the relative axial position between the first outer peripheral member 10 and the first pressing member 9 changes depending on whether the first spring 7 is in an extended or compressed state.

[0021] <Convex part> The insertion section 22 may have a protrusion 3 on the side surface surrounding the axial direction (X direction) of the male connector 1. The shape of the protrusion 3 is not limited to a circle, but may be a polygon such as a square. Note that friction can be reduced if the edges of the protrusion 3 are curved.

[0022] <Female connector> The female connector 2 has a second tube 17 inside through which a fluid flows, and an insertion receiving portion 24 that is recessed in the axial direction (X direction) into which the insertion portion 22 is inserted and connected. The female connector 2 also connects to a tube at a tube connecting portion 6 at the end. The second tube 17 allows the fluid to flow from the tube.

[0023] <Inserted part> The inserted portion 24 is concave in the axial direction (X direction), and includes a second pressing member 13, a second seal member 12, and a second outer peripheral member 19.

[0024] <Second pressing member> The second pressing member 13 is convex in the axial direction, and is biased axially outward by the second spring 11 when the male connector 1 is not inserted into the female connector 2. When the male connector 1 is inserted into the female connector 2, the second pressing member 13 comes into contact with the first pressing member 9.

[0025] <Second sealing member> The second seal member 12 is annular and is disposed around the second pressing member 13. The second seal member 12 may be, for example, an O-ring.

[0026] <Second peripheral member> The second outer peripheral member 19 is biased in the axial direction (X direction) by the second spring 11. When the male connectors are separated, the second outer peripheral member 19 abuts against the second seal member 12, closing the flow path 18 between the first tube 16 of the male connector 1 and the second tube 17 of the female connector 2. This results in a closed state.

[0027] On the other hand, when the second spring 11 is compressed, the second outer peripheral member 19 moves away from the second seal member 12, opening the flow path 18 between the first tube 16 and the second tube 17. This results in an open state. The second outer peripheral member 19 is connected to the second pressing member 13 via the second spring 12, and the relative positions in the axial direction between the second outer peripheral member 19 and the second pressing member 13 change depending on whether the second spring 11 is in an expanded or compressed state.

[0028] (closed state) In the closed state, the male connector 1 is inserted into the female connector 2, the first pressing member 9 and the second pressing member 13 are brought into contact, the first spring 7 biases the first pressing member 9, and the second spring 11 biases the second pressing member 13. In this case, the first outer peripheral member 10 and the first seal member 8, and the second outer peripheral member 19 and the second seal member 12 are brought into contact, respectively, to close the flow path 18 between the first tube 16 and the second tube 17.

[0029] (open state) On the other hand, in the open state, the first springs 7 and second springs 11 are compressed, and the relative positions of the first pressing member 9 and the second pressing member 13 in the X direction with respect to the first outer peripheral member 10 and the second outer peripheral member 19 change in the positive X direction. As a result, the first outer peripheral member 10 and the second outer peripheral member 19 are separated from the first seal member 8 and the second seal member 12, and as shown by the arrow in FIG. 2 , a flow path 18 between the first tube 16 and the second tube 17 is opened. In this case, the direction of the flow path 18 is not limited to a flow from the first tube 16 to the second tube 17, but may be a flow from the second tube 17 to the first tube 16. Furthermore, the flow path 18 is defined on the outer peripheries of the first pressing member 9 and the second pressing member 13, between the first outer peripheral member 10 and the second outer peripheral member 19 and the first seal member 8 and the second seal member 12.

[0030] When the first seal member 8 and the second seal member 12 have the same diameter as described in Patent Document 1, the first seal member 8 and the second seal member 12 must be closed on a surface parallel to the axis, creating a space between the first seal member 8 and the second seal member 12 in which liquid remains. 2, the outer diameter R2 of the second seal member 12 is smaller than the outer diameter R1 of the first seal member 8. In other words, an inclined surface (tapered surface) is defined from the first seal member 8 of the male connector 1 to the second seal member 12 of the female connector 2. With the above configuration, there is an inclined surface from the first seal member 8 to the second seal member 12, compared to when the first seal member 8 and the second seal member 12 have the same diameter. Therefore, the corresponding inclined surface of the first outer peripheral member 10 is brought into contact with the first seal member 8, and the corresponding inclined surface of the second outer peripheral member 19 is brought into contact with the second seal member 12, thereby closing the flow path 18. This makes it possible to reduce the space where liquid remains between the first seal member 8 and the second seal member 12. This reduces the amount of liquid remaining between the first seal member 8 and the second seal member 12, thereby suppressing liquid leakage when the male connector and female connector are separated.

[0031] <External sealing material> As shown in FIGS. 2 and 4, an external seal member 15 may be further provided to provide a seal between the first outer peripheral member 10 and the second outer peripheral member 19 and the annular member 14 of the female connector 2 that surrounds the outer peripheries of the first outer peripheral member 10 and the second outer peripheral member 19. The external seal member 15 abuts against the first outer peripheral member 10 or the second outer peripheral member 19, causing the first outer peripheral member 10 and the second outer peripheral member 19 to shift in the axial direction. For this reason, the cross-sectional shape of the external seal member 15 is, for example, X-shaped. Because the cross-section is X-shaped, the external seal member 15 contacts the first outer peripheral member 10 or the second outer peripheral member 19 at two points in the axial direction, resulting in lower axial sliding resistance than a normal circular shape. The external sealing member 15 abuts against the first outer peripheral member 10 or the second outer peripheral member 19 to form a seal, so that liquid leakage can be suppressed even when the first outer peripheral member 10 and the second outer peripheral member 19 are shifted axially between the closed state and the open state.

[0032] <First through hole> As shown in Figures 1 and 3, the inserted portion 24 may have a first through hole 4 on the side surface surrounding the axial direction (X direction) of the female connector 2, extending in a direction inclined with respect to the axial direction, and through which the protrusion 3 can move. The male connector 1 is connected to the female connector 2 by the protrusion 3 being guided in the axial direction by the first through-hole 4 of the female connector 2 . If the hole were provided along the axial direction, the male connector 1 would need to be pushed straight in the axial direction without rotating, which would require a large force. In contrast, because the first through-hole 4 is provided at an angle to the axial direction, the male connector 1 can be easily inserted in the axial direction with little force by using torque while rotating it. In addition, because the first through-hole 4 is at an angle to the axial direction, the rotation direction when pushing it in the axial direction can be specified.

[0033] Here, the first through hole is a "through hole" that penetrates the surface of the female connector 2, but is not limited to this and may be a groove provided on the back surface side that faces the male connector 1. In this case as well, if the protrusion 3 is movable in the groove, the protrusion 3 can be guided to connect the male connector 1 to the female connector 2. On the other hand, compared to a groove that is not visible from the front surface side, the "through hole" allows the protrusion 3 to be visible on the front surface side of the female connector 2, making it easier to guide the protrusion 3. In addition, although the case where the convex portion 3 is provided on the front side of the male connector 1 and the groove is provided on the back side of the female connector 2 has been shown, this is not limiting and the reverse configuration may also be used. For example, the groove may be provided on the front side of the male connector 1 and the convex portion may be provided on the back side of the female connector 2.

[0034] (Variation 1) Fig. 6A is a cross-sectional view, seen from the axial direction, of a female connector 2 of a modified example of the tube joint according to embodiment 1. Fig. 6B is a cross-sectional view, seen from the axial direction, of a male connector 1 of a modified example of the tube joint according to embodiment 1. In the modified female connector 2, three first through holes 4a, 4b, and 4c are provided along the circumferential direction at equal angles relative to the axis. In addition, in the modified male connector 1, three protrusions 3a, 3b, and 3c are provided along the circumferential direction at equal angles relative to the axis. In this case, any of the three protrusions 3a, 3b, and 3c can be associated with any of the three first through holes 4a, 4b, and 4c.

[0035] Note that the number of protrusions 3 and first through holes 4 is not limited to one as described above, and multiple protrusions 3 and multiple first through holes 4 may be provided as shown in FIGS. 6A and 6B . Furthermore, the multiple protrusions 3 and multiple first through holes 4 do not necessarily need to be provided at equal angles relative to the axis. They may be provided at different angles. In this case, the corresponding protrusions 3 and first through holes 4 are limited, and the insertion angle is also limited. Furthermore, the number of protrusions 3 may be fewer than the number of multiple first through holes 4. For example, when the number of first through holes 4 is three as shown in FIG. 6A , the number of protrusions 3 may be two. In this case, the angles between the multiple protrusions 3 and the angles between the multiple first through holes 4 may be set to match the corresponding angles. These settings allow for adjustment of the degree of freedom in arranging the protrusions 3 relative to the multiple first through holes 4.

[0036] <Second through hole> It may further have a second through hole 5 that continues from the axial end 26b of the first through hole 4 along the in-plane direction of the side surface and extends circumferentially approximately perpendicular to the axial direction on the side surface in a direction intersecting the axial direction. The male connector 1 is connected to the female connector 2 by fixing the protrusion 3 in the axial direction by the second through-hole 5. Furthermore, by providing the second through-hole 5 with a predetermined length in the circumferential direction, the position of the protrusion 3 in the circumferential direction can be adjusted. This eliminates twisting of the tube due to rotation of the male connector 1. The second through-hole 5 may be at an angle of, for example, 20° or more relative to the axis.

[0037] 1 and 3, the second through hole 5 is provided so as to extend from the axial end 26b of the first through hole 4 in the same circumferential direction as the circumferential component of the first through hole 4, but this is not limited thereto. The second through hole 5 may be provided so as to extend in the circumferential direction opposite to the circumferential component of the first through hole 4. Furthermore, the second through hole 5 may be provided so as to branch in two opposing directions from the axial end 26b of the first through hole 4. For example, the second through hole 5 may be provided so as to form a T-shape with respect to the first through hole 4. Furthermore, a protrusion may be provided at the boundary between the first through hole 4 and the second through hole 5 to prevent the convex portion 3 from easily moving between the first through hole 4 and the second through hole 5. This makes it possible to stably hold the convex portion 3 in the second through hole 5.

[0038] (Variation 2) As a second modification, one or more protrusions 28 may be provided in the second through-hole 5 to prevent the convex portion 3 from easily moving in the circumferential direction within the range of the second through-hole 5 (for example, FIG. 7). This makes it possible to stably hold the convex portion 3 in the second through-hole 5.

[0039] Furthermore, a third through hole may be provided that continues from end 26a of first through hole 4 on the near side in the insertion direction along the in-plane direction of the side surface and extends in the circumferential direction approximately perpendicular to the axial direction on the side surface in the direction intersecting the axial direction. This allows male connector 1 to be stably held in a state where it is not pushed into female connector 2. Furthermore, the inserted portion may have a plurality of first through holes and a plurality of second through holes on a side surface in the axial direction, and the degree of freedom of the insertion position of the convex portion in the rotational direction corresponding to the positions of the plurality of first through holes may be adjustable.

[0040] (Embodiment 2) The tube fitting according to the second embodiment is characterized in that the outer diameters of the first pressing member 9 to the second pressing member 13 between the first sealing member 8 and the second sealing member 12 are inclined from the outer diameter R1 of the first sealing member 8 to the outer diameter R2 of the second sealing member 12. This further reduces the space between the first seal member 8 and the second seal member 12 where liquid remains, further suppressing liquid leakage during separation.

[0041] In addition, the present disclosure includes appropriate combinations of any of the various embodiments and / or examples described above, and can achieve the effects of each embodiment and / or example. [Industrial Applicability]

[0042] According to the tube fitting according to the present disclosure, leakage of liquid during disconnection can be suppressed. [Explanation of symbols]

[0043] 1 male connector 2 female connectors 3, 3a, 3b, 3c convex part 4, 4a, 4b, 4c First through-hole 5 Second through hole 6 Tube connection 7 First spring 8 First sealing member 9 First pressing member 10 First peripheral member 11 Second spring 12 second seal member 13 Second pressing member 14 Annular member 15 External sealing member 16 First Tube 17 Second Tube 18 Flow path 19 Second peripheral member 20 Tube fittings 22 Insertion section 24 Inserted part 26a Front end 26b Axial side end 28 Protrusion R1 Outer diameter of first seal member R2 Outer diameter of second seal member

Claims

1. A tube joint for connecting tubes through which a fluid flows, a male connector having a first tube inside which a fluid flows and an insertion portion that is convex in an axial direction that is an insertion direction; a female connector having a second tube inside through which a fluid flows and having an insertion receiving portion that is recessed in the axial direction and into which the insertion portion is inserted and connected; Equipped with The insertion portion is a first pressing member that is convex in the axial direction and that is biased outward in the axial direction by a first spring when the male connector is not inserted into the female connector; a first annular seal member disposed around the first pressing member; a first outer peripheral member that supports the first spring in the axial direction, is spaced apart from the first pressing member, annularly surrounds the axial periphery, and comes into contact with the first seal member to close the flow path between the first tube and the second tube when the first pressing member is biased by the first spring, and is spaced apart from the first seal member to open the flow path between the first tube and the second tube when the first spring is compressed; and The inserted portion is a second pressing member that is convex in the axial direction and that is biased outward in the axial direction by a second spring when the male connector is not inserted into the female connector, and that abuts against the first pressing member when the male connector is inserted into the female connector; a second annular seal member disposed around the second pressing member; a second outer peripheral member that is biased by the second spring, that abuts against the second seal member to close the flow path between the first tube and the second tube when the male connector is not inserted, and that moves away from the second seal member to open the flow path between the first tube and the second tube when the second spring is compressed; and and When the male connector is inserted into the female connector, the first pressing member and the second pressing member are brought into contact with each other, the first spring biases the first pressing member, and the second spring biases the second pressing member, the first outer peripheral member and the first sealing member, and the second outer peripheral member and the second sealing member, respectively, come into contact with each other, resulting in a closed state in which the flow path between the first tube and the second tube is closed, When the first spring and the second spring are compressed, the first and second outer peripheral members are separated from the first sealing member and the second sealing member, and the flow path between the first pipe and the second pipe is opened to an open state, The outer diameter of the second seal member is smaller than the outer diameter of the first seal member. Tube fittings.

2. 2. The tube joint according to claim 1, wherein an outer diameter of the first pressing member between the first seal member and the second seal member and the second pressing member is tapered from the outer diameter of the first seal member to the outer diameter of the second seal member.

3. 3. The tube fitting according to claim 1, further comprising an external seal member that seals between the first outer peripheral member and the second outer peripheral member and an annular outer peripheral member of the female connector that surrounds the outer peripheries of the first outer peripheral member and the second outer peripheral member.

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