KR20220166653A - Face Contact Extension Ring type Quick Connector - Google Patents

Abstract

An airtight surface contact expandable quick connector (1-1) of the present invention is located on an O-ring inner wall (6a) of a front end watertight part (6) between the front end watertight part (6) and a rear end watertight part (8) of a pipe connection section (3, 5, 6, 8) in which a pipe connection part (9) to which a pipeline or a first pipe is connected is connected in a bent structure. An O-ring (70) having a circular cross section (70a) or a rectangular cross section (70c) as a cross-sectional shape forms an axial/radial contact portion (K) in combination with a spacer (90). The axial/radial contact portion (K) forms radial surface contact with the O-ring inner wall (6a) while increasing the axial radius by compressing the cross-sectional shape, or forms axial surface contact with the O-ring inner wall (6a) while reducing the axial radius, such that internal confidentiality performance is enhanced and a continuous maintenance function is possible. In particular, the expansion of the axial contact surface or the radial contact surface of the O-ring (70) is selectively performed through a combination of a plurality of rings, thereby providing variability according to the characteristics of a high-pressure fluid.

Description

Airtight Face Contact Extension Ring type Quick Connector {Face Contact Extension Ring type Quick Connector}

The present invention relates to a connector, and more particularly, to an airtight surface contact expansion type quick connector that enhances internal airtight performance by expanding an axial contact surface or a radial contact surface in an inner space of a coupling connector.

In general, the coupling device applied to the fluid pipeline must be able to maintain internal airtight performance in the fluid flow state, and in the connector connection process, the assembly state recognition between the coupling connector and the connection plug must be clearly established by the operator, Separation or separation due to strong tensile force applied by an external force in the assembled state must be prevented reliably.

In particular, when the coupling device is used in a high-pressure fuel line of a vehicle or a hydrogen/oxygen supply line of a fuel cell vehicle, the performance of maintaining internal confidentiality, recognizing the connector assembly state, and maintaining the connector connection state must be guaranteed.

As an example of such a performance assurance structure coupling device, Korean Patent KR 528,877 B1 (2005.11.9) “quick-mounted coupling device capable of detachable for accommodating a tubular plug connection member (hereinafter referred to as a quick-mounted coupling device) There is.

For example, in the domestic patent registration KR 528,877 B1 (November 9, 2005), the quick-mount coupling device has a storage housing 1 into which a plug connection member 3 is inserted into an internal storage space 6, and a storage space 6 A retaining spring 2 positioned inside of the retaining spring 2 for restraining the plug connection member 3, and a plurality of rings 9 positioned inside the storage space 6 to maintain internal airtightness in a state where the plug connection member 3 is fitted. ,10,20). In this case, the plurality of rings 9, 10, 20 are a pair of sealing rings 9, an intermediate ring 10 located between the sealing rings 9, and a spacing located forward of the sealing rings 9. It consists of a ring (20).

In particular, the pair of sealing rings 9 and the intermediate ring 10 among the plurality of rings 9, 10, and 20 function as an airtight assembly, so that the outer circumferential surface of the plug connection member 3 inserted in the accommodation space 6 and It is attached and maintains the internal airtight performance of the coupling device.

Therefore, the coupling device contributes to ensuring performance of internal airtightness in a state in which fluid flows into the storage space 6 .

Domestic registered patent KR 528,877 B1

However, in the quick-mount coupling device of the Korean Patent Registration No. KR 528,877 B1 (November 9, 2005), the airtight assembly has an annular ring structure in which each of the sealing ring 9 and the intermediate ring 10 has an axial contact surface and a radial contact surface. Failure to form it properly causes a problem that the guarantee for maintaining the internal confidentiality performance is not sufficient.

In particular, in vehicles using high-input fuel lines that face harsh external environmental conditions during driving, especially fuel cell vehicles using hydrogen/oxygen lines, the uncertain internal airtight performance of the coupling device allows high-pressure fluid to flow without any leakage. It is bound to be difficult to maintain.

Therefore, in view of the above points, the present invention can maintain the maintenance function while strengthening the internal airtight performance by sufficiently securing the axial contact surface and the radial contact surface of the ring located in the inner space of the coupling connector. An object of the present invention is to provide an airtight surface contact expansion type quick connector in which variability tailored to high-pressure fluid characteristics is provided by selectively expanding the axial contact surface or the radial contact surface of the ring through a combination of a plurality of rings.

The quick connector of the present invention for achieving the above object connects the pipe, and the inlet portion connected to the pipe; a front end watertight portion located between the inlet and outlet; a rear end watertight part having a smaller inner diameter than the front end watertight part by the height of the step; a retainer mounted inside the front end watertight part in the axial direction and having the same inner diameter as the rear end watertight part; an O-ring positioned between the retainer and the step of the rear end watertight part and located on an inner wall of the O-ring of the front end watertight part; It is characterized in that a first concave surface and a second concave surface are formed on the retainer and the step, respectively, so that the contact area of the O-ring is increased by compressive deformation by the inner wall of the O-ring and the pipe.

In addition, the quick connector of the present invention for achieving the above object connects the pipe, and the front end watertight portion located between the inlet and the outlet; a rear end watertight part having a smaller inner diameter than the front end watertight part by the height of the step; a retainer mounted inside the front end watertight part in the axial direction and having the same inner diameter as the rear end watertight part; an O-ring positioned between the retainer and the step of the rear end watertight part and located on an inner wall of the O-ring of the front end watertight part; The O-ring formed longer in the axial direction than in the radial direction has a first concave surface and a second concave surface on each of the retainer and the step so that the contact area of the O-ring is increased by compressive deformation by the inner wall of the O-ring and the pipe characterized by the formation of

And the quick connector of the present invention for achieving the above object connects the pipe, and the front end watertight portion located between the inlet and the outlet; a rear end watertight part having a smaller inner diameter than the front end watertight part by the height of the step; a retainer mounted inside the front end watertight part in the axial direction and having the same inner diameter as the rear end watertight part; a first O-ring and a second O-ring positioned between the retainer and the step of the rear end watertight part and located on an inner wall of the O-ring of the front end watertight part; a spacer positioned between the first O-ring and the second O-ring; Characterized in that a first concave surface and a second concave surface are formed on the retainer and the step, respectively, so that contact areas between the first O-ring and the second O-ring are increased by compressive deformation by the inner wall of the O-ring and the pipe.

As a preferred embodiment, the first concave surface of the retainer is formed along a circumferential direction of the retainer based on a central portion of a surface where the retainer contacts the first O-ring.

As a preferred embodiment, the depth of the first concave surface of the retainer is maximum at the central portion and decreases toward the inner diameter of the rear end watertight portion and the front end watertight portion around the center portion.

In a preferred embodiment, the depth of the second concave surface formed at the step of the rear end watertight part increases further from the inner diameter of the rear end watertight part to the inner diameter of the front end watertight part.

In a preferred embodiment, the pipe connection section forms the retainer accommodating portion and the inlet portion in front of the front watertight portion, and forms the rear watertight portion in the rear, the inlet portion and the retainer accommodating portion, the front watertight portion, and the rear watertight seal. The portion changes the cross-section of the inner space with a gradual reduction in diameter.

In a preferred embodiment, the pipe connection section forms a pipe connection portion connected to the diameter reduction portion, and the pipe connection section forms a bending structure with the pipe connection section.

As a preferred embodiment, a connection plug or a second pipe into which fluid flows is connected to the pipe connection section through the inlet, and a pipeline or a second pipe to receive the fluid from the rear end watertight part is connected to the pipe connection section. Connected.

As a preferred embodiment, the connection plug or the second pipe forms a spaced distance from the diameter reducing part, and the spaced distance is formed as a filling space for the fluid exiting the pipe or the connection plug or the second pipe to reduce the pressure applied by the fluid. alleviates

The coupling device to which the airtight surface contact expansion type quick connector of the present invention is applied implements the following actions and effects.

First, the internal hermetic performance of the quick connector can be enhanced through the expansion of the axial contact surface and the radial contact surface of the ring. Second, by combining a plurality of rings to selectively expand an axial contact surface or a radial contact surface, it is possible to implement various quick connectors tailored to high-pressure fluid characteristics. Third, by using a quick connector with enhanced internal airtight performance, quality performance can be secured for the high-input fuel line of a vehicle, especially the hydrogen/oxygen line of a fuel cell vehicle.

1 is a configuration diagram of an airtight surface contact expansion type quick connector according to the present invention, and FIG. 2 is an example in which an airtight assembly constituting a surface contact expansion ring of a quick connector according to the present invention is composed of a combination of a pair of O-rings and an intermediate ring. 3 is an example in which the airtight assembly according to the present invention is composed of one circular cross-section O-ring, Figure 4 is an example in which the airtight assembly according to the present invention is composed of one rectangular cross-section O-ring, and FIG. 5 is a plane according to the present invention. The tight assembly constituting the contact expansion ring constitutes the quick connector as a combination of the locking assembly and the retainer, and is used as a coupling device connected to the connecting plug.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying exemplary drawings, and since these embodiments can be implemented in various different forms by those skilled in the art as an example, the description herein It is not limited to the embodiment of

Referring to FIG. 1, the quick connector 1-1 is composed of pipe connection sections 3, 5, 6, 8 and a pipe connection portion 9, and a locking assembly 10 and a retainer embedded in the pipe connection section (50) and an airtight assembly (60).

For example, the pipe connection sections 3, 5, 6, and 8 are formed in a straight line with an inner space having a gradually smaller diameter, whereas the pipe connection portion 9 is formed in a straight line with an inner space of a constant diameter. By bending at a predetermined angle at the back of the connection sections (3, 5, 6, 8), it is formed as an approximately “A”-shaped quick connector. However, the pipe connection sections (3, 5, 6, 8) and the pipe connection ( 9) can be formed into a straight quick connector by forming a straight line.

Specifically, the pipe connection sections 3, 5, 6, and 8 connect the inlet portion 3 to the front portion (ie, the inlet portion to which the connection plug 1-2 (or the second pipe) (see FIG. 5) is connected. ), the retainer accommodating portion 5, the front end watertight portion 6, and the rear end watertight portion 8 are connected to the rear.

For example, the inlet part 3 forms an inner space into which the connection plug 1-2 (or the second pipe) is inserted, and the side windows 3a communicating with the inner space are pierced on both sides of the left and right sides. It allows the locking assembly 10 to be inserted into the interior space from the outside.

In addition, the retainer accommodating portion 5 continues from the inlet portion 3 to form an inner space with a diameter reduced compared to the inlet portion 3, so that the retainer 50 is positioned, and the front end watertight portion 6 is the retainer accommodating portion ( Continuing from 5), an internal space having a reduced diameter compared to the retainer accommodating portion 5 is formed, and the airtight assembly 60 is positioned.

In addition, the rear end watertight part 8 continues from the front end watertight part 6 to form an inner space with a diameter reduced compared to the front end watertight part 6, so that the end of the connection plug 1-2 (see FIG. 5) is located. and the pipe connection part 9 is bent at its end.

Therefore, since the inner diameter of the rear end watertight portion 8 is the same as the outer diameter of the connecting plug 1-2 (or the second pipe) (see Fig. 5), it is press-fitted with the connecting plug 1-2 (or the second pipe). do.

In addition, the inner space of the rear end watertight part 8 forms a separation distance Y (see FIG. 5) with the end of the connection plug 1-2 (or the second pipe), and the separation distance Y The silver connection plug 1-2 (see FIG. 5) is formed as a filling space for the fluid coming out, thereby mitigating the impact caused by the high pressure applied by the fluid.

For example, the pipe connection part 9 is fastened with a pipeline (or a first pipe, not shown) by forming a screw on its outer circumferential surface, and by forming an airtight seal with the pipeline using a plurality of airtight rings to prevent leakage of fluid. It can be prevented.

Specifically, the locking assembly 10 is accommodated in the inner space of the inlet portion 3 and forms a main restraining force for restraining the connection plugs 1-2 (see FIG. 5) in the axial and radial directions. The retainer 50 is accommodated in the inner space of the retainer accommodating portion 5 and forms an auxiliary restraining force that restrains the connection plugs 1-2 (see Fig. 5) in the axial and radial directions. The airtight assembly 60 is accommodated in the inner space of the front end watertight part 6 and the rear end watertight part 8 and adheres to the outer diameter of the connection plug 1-2 (see FIG. 5), thereby forming a quick connector 1-1. It forms a confidentiality for the inner space of the

In particular, since the inner diameter of the retainer 50 matches the inner diameter of the rear end watertight part 8 and the outer diameter of the connection plug 1-2 (or the second pipe) (see FIG. 5), the rear end watertight part 8 ), it is press-fitted with the connection plug 1-2 (or the second pipe).

Therefore, each of the locking assembly 10, the retainer 50, and the airtight assembly 60 is a component applied to the quick connector 1-1, however, the present invention is the airtight assembly 60 and for this Since the assembly structure of the quick connector 1-1 is specifically described for an embodiment tailored thereto.

For example, the airtight assembly 60 is inserted into the inner space of the inlet part 3 and passed through the inlet part 3 and the retainer receiving part 5 and between the front end watertight part 6 and the rear end watertight part 8 In the positioning state, the outer diameter of the inserted connection plug 1-2 (see Fig. 5) and the compressive deformation caused by the close contact between the front and rear watertight parts 6 and 8 of the front watertight part 6 Assembled in the interior space.

To this end, the airtight assembly 60 is composed of an O-Ring 70 and a spacer 90 located in the inner space of the front end watertight part 6, and the O-ring 70 is attached to the spacer 90. It consists of a front O-ring (80-1) located at the front and a rear O-ring (80-2) located at the rear. In this case, each of the front O-ring 80-1, the spacer 90, and the rear O-ring 80-2 is made of an elastic material to generate compression deformation due to external pressure, and rubber or polyurethane may be used as a material. can

Meanwhile, FIG. 2 shows a state in which the airtight assembly 60 is composed of a combination of the front O-ring 80-1, the spacer 90, and the rear O-ring 80-2 and is arranged in the inner space of the front end watertight part 6. foreshadow In this case, the front O-ring 80-1, the spacer 90, and the rear O-ring 80-2 are shown in the drawings in a state of being spaced apart from each other, but are formed in close contact with each other in an actual assembled state. .

As shown, the airtight assembly 60 forms an axial/radial contact portion K with a combination of a front O-ring 80-1, a spacer 90, and a rear O-ring 80-2.

For example, the front O-ring 80-1 is located toward the retainer 50 located in the inner space of the retainer receiving portion 5, and the rear O-ring 80-2 is adjacent to the front O-ring 80-1. It is located at the rear of the spacer 90 toward the step 8a protruding from the rear end watertight portion 8.

To this end, each of the front O-ring 80-1 and the rear O-ring 80-2 has a circular cross section 70a, and the diameter d1 of the front O-ring 80-1 and the rear O-ring 80 The diameter (d2) of -2) applies the same size to each other. However, the diameter d1 of the front O-ring 80-1 and the diameter d2 of the rear O-ring 80-2 may be applied in different sizes, which is the front end watertight part in the quick connector 1-1. (6) and the internal structure change of the rear end watertight part (8) or the change in the length of the formed section is tailored to the required airtight performance.

Furthermore, the retainer 50 is in close contact with one section of the front O-ring 80-1 by forming a first concave surface 50a on a surface facing one section of the front O-ring 80-1, and the rear end watertight portion (8) expands the contact area by forming a second concave surface (8b) to the inside of the step (8) and being in close contact with one section of the rear O-ring (80-2).

In particular, the first concave surface 50a of the retainer 50 is formed along the circumferential direction of the retainer 50 based on the central portion of the surface where the retainer 40 contacts the front O-ring 80-1, and its depth is It is formed to be maximum at the center of the first concave surface 50a and decrease toward the inner diameter of the rear end watertight part 8 and the front end watertight part 6 around the center.

In addition, the step 8 of the rear end watertight part 8 is formed so that the depth of the second concave surface 8b increases from the inner diameter of the rear end watertight part 8 to the inner diameter of the front end watertight part 6. .

Therefore, the front O-ring 80-1 is in close contact with the first concave surface 50a of the retainer 50 located in the retainer accommodating portion 5 to form a confidentiality for the front portion of the front end watertight portion 6 , The rear O-ring 80-2 is in close contact with the second concave surface 8b formed on the step 8 of the rear end watertight part 8 to form a confidentiality for the rear part of the front end watertight part 6, The spacer 90 is located between the front O-ring 80-1 and the rear O-ring 80-2 to form airtightness in the middle of the front end watertight portion 6.

Furthermore, each of the front/rear O-rings 80-1,80 undergoes compression deformation by the outer diameter of the O-ring inner wall 6a and the connection plug 1-2 (or the second pipe) (see FIG. 5), This compressive deformation increases the O-ring contact area by the first concave surface 50a of the retainer 50 and the second concave surface 8a of the step 8.

For example, the spacer 90 is positioned behind the front O-ring 80-1, and the rear O-ring 80-2 is positioned behind the spacer 90.

In particular, the spacer 90 is formed with a narrow cross section 90a in which both left and right surfaces are recessed in a concave shape, and the narrow cross section 90a is concave on one side and has a circular cross section of the front O-ring 80-1. While seating (70a), the circular cross section (70a) of the rear O-ring (80-2) is seated in a concave shape on the opposite side. In this case, the narrow section 90a is formed smaller than the circular section 70a, but may be formed to have the same size.

Therefore, the axial/radial contact portion K is implemented as a combination of the circular cross section 70a of the front/rear O-rings 80-1 and 80-2 and the narrow cross section 90a of the spacer 90, from which compression is achieved. When deformed, the axial radius becomes smaller and the axial surface contact is formed, so that the axial air tightness performance can be enhanced. In this case, the spacer 90 acts to further strengthen the axial airtightness performance by accommodating the compression deformation parts of the front/rear O-rings 80-1 and 80-2 into the narrow cross section 90a.

Meanwhile, FIGS. 3 and 4 illustrate that the axial/radial contact portion K is composed of a first deformable axial/radial contact portion K and a first deformable axial/radial contact portion K.

Referring to FIG. 3, the first deformable axial/radial contact portion K has a diameter d1 of the circular cross section 70a of the front O-ring 80-1 and a circular cross section of the rear O-ring 80-2 ( By changing the diameter d2 for 70a) to a larger diameter D, the front and rear O-rings 80-1 and 80-2 are made into one O-ring 70, and at the same time without applying a spacer 90. may also consist of another axial/radial contact portion (K). In this case, the diameter D of the O-ring 70 is applied as a larger value than the diameter d1 of the front O-ring 80-1 and the diameter d1 of the rear O-ring 80-2.

In particular, the increased diameter D of the O-ring 70 forms a wider area of contact with the inner wall 6a of the O-ring of the shear watertight portion 6 during compression deformation.

Therefore, the first deformable axial/radial contact portion K is implemented as one circular cross-section O-ring 70 with a larger diameter D, and from this, the axial radius decreases during compression deformation, thereby improving the axial surface contact. By forming it, the axial direction tightness performance can be enhanced.

In addition, the O-ring 70 of one circular cross section has a first concave surface 50a formed on the surface of the retainer 50 facing one section and the step 8 of the rear end watertight portion 8 facing the opposite section The contact area is expanded by being in close contact with the second concave surface 8b formed on the surface.

Therefore, the O-ring 70 of one circular cross section undergoes compression deformation due to the outer diameter of the O-ring inner wall 6a and the connection plug 1-2 (or the second pipe) (see FIG. 5), and this compression deformation The O-ring contact area is increased by the first concave surface 50a of the retainer 50 and the second concave surface 8a of the step 8.

On the other hand, referring to FIG. 4, the second deforming axial/radial contact portion K has a diameter d1 of the circular cross section 70a of the front O-ring 80-1 and a circular cross section of the rear O-ring 80-2. By changing the diameter d2 of (70a) to a rectangular length L, the front/rear O-rings 80-1 and 80-2 are made into one rectangular cross-section O-ring 70, and at the same time the spacer 90 Even without application, it can consist of another axial/radial contact (K). In this case, the rectangular length (L) of the O-ring (70) matches the length of the inner space of the front end watertight portion (6).

In particular, the rectangular length (L) of the O-ring 70 is formed longer in the axial direction than in the radial direction, thereby forming a wide area in contact with the inner wall 6a of the O-ring of the front end watertight portion 6 in the entire section during compression deformation.

Therefore, the second deformation axial/radial contact portion (K) is implemented as one O-ring (70) having a rectangular cross section of a rectangular length (L), from which the axial radius increases during compression deformation to form radial surface contact. Radial tightness can be enhanced.

In addition, the one rectangular cross-section O-ring 70 has a first concave surface 50a formed on the surface of the retainer 50 facing one section and the step 8 of the rear end watertight portion 8 facing the opposite section The contact area is expanded by being in close contact with the second concave surface 8b formed on the surface.

Therefore, the O-ring 70 of one rectangular cross section undergoes compression deformation due to the outer diameter of the O-ring inner wall 6a and the connection plug 1-2 (or the second pipe) (see FIG. 5), and this compression deformation occurs The O-ring contact area is increased by the first concave surface 50a of the retainer 50 and the second concave surface 8a of the step 8.

On the other hand, FIG. 5 shows an example of the coupling device 1 . As shown, the coupling device 1 is composed of a quick connector 1-1 to which an airtight assembly 60 is applied and a connection plug 1-2 (ie, a second pipe) fastened thereto, thereby providing high pressure Forms a fluid flow path.

As an example, the quick connector 1-1 is the quick connector 1-1 illustrated through FIGS. 1 to 4.

From this, the coupling device 1 may constitute a pipeline (ie, a first pipe, not shown) connected to the pipe connection portion 9 of the quick connector 1-1. In this case, the pipeline may be a high intake fuel line of a vehicle or a hydrogen/oxygen line of a fuel cell vehicle.

Therefore, in the coupling device 1, the connection portion of the quick connector 1-1 and the connection plug 1-2 is the front / rear O-rings 80-1 and 80-2 of the airtight assembly 60 and the spacer ( 90) maintains the airtight performance of the inner space of the dual quick connector (1-1) in the axial and radial directions by the variously combined axial/radial contact parts (K), through which the vibration caused by the continuously applied external force and internal airtight performance can be maintained even under strong tensile force.

Furthermore, the end of the connection plug (1-2) or the second pipe forms a separation distance (Y) with the rear watertight portion (8) of the quick connector (1-1), and the separation distance (Y) is connected Formed as a filling space for the fluid coming out of the plug 1-2, it relieves the impact caused by the high pressure applied by the fluid.

In addition, the connecting plug (1-2) or the second pipe forms a concentric flange with a larger diameter at its rear portion, and the concentric flange is accommodated in the inlet portion (3) of the quick connector (1-1) Locking assembly And by forming the locking structure (Z) greatly increases the resistance and durability against the strong tensile force applied by the external force.

As described above, the airtight surface contact expandable quick connector 1-1 according to the present embodiment has a pipe connection section 3, 5, 6 in which the pipe connection portion 9 to which the pipeline or the first pipe is connected is connected in a bent structure. It is located on the O-ring inner wall 6a of the front end watertight part 6 between the front end watertight part 6 and the rear end watertight part 8 of ,8), and has a circular cross section 70a or a rectangular cross section 70c in cross-sectional shape The O-ring 70 and the spacer 90 form an axial/radial contact portion K in combination with the spacer 90, and the axial/radial contact portion K has a radial surface while increasing the axial radius by compressing the cross-sectional shape. By forming contact with the O-ring inner wall 6a or forming axial surface contact with the O-ring inner wall 6a while reducing the axial radius, it is possible to strengthen the internal airtight performance and continuously maintain the function, especially the O-ring 70 The expansion of the axial contact surface or the radial contact surface of the ring is selectively performed through a combination of a plurality of rings, thereby providing variability tailored to high-pressure fluid characteristics.

1: coupling device
1-1: quick connector 1-2: connection plug
3: entrance 3a: side window
5: retainer receiving part
6: Shear watertight part 6a: O-ring inner wall
6b: seating groove 6c: expansion groove
8: rear end watertight part 8a: stepped
8b: second concave surface
9: pipe connection 10: locking assembly
50: retainer 50a: first concave surface
60: confidential assembly
70: O-Ring 70a: circular cross section
70b: U-shaped cross section 70c: rectangular cross section
80-1: Front O-ring 80-2: Rear O-ring
90: spacer 90a: narrow section

Claims (9)

In the quick connector connecting the pipes,
an inlet portion connected to the pipe;
a front end watertight portion located between the inlet and the outlet;
a rear end watertight part having an inner diameter smaller than that of the front end watertight part by the height of the step;
a retainer mounted inside the front end watertight part in the axial direction and having the same inner diameter as the rear end watertight part;
an O-ring positioned between the retainer and the step of the rear end watertight part and located on an inner wall of the O-ring of the front end watertight part;
A quick connector, characterized in that a first concave surface is formed on the retainer and a second concave surface is formed on the step so that the contact area of the O-ring is increased by compressive deformation by the inner wall of the O-ring and the pipe.
The method of claim 1,
The first concave surface of the retainer is a quick connector, characterized in that formed along the circumferential direction of the retainer based on the central portion of the surface in contact with the O-ring.
The method of claim 2,
The quick connector, characterized in that the depth of the first concave surface of the retainer is maximum at the central portion and decreases toward an inner diameter of the rear end watertight portion and an inner diameter of the front end watertight portion around the center portion.
The method of claim 3,
The second concave surface formed on the step of the rear end watertight part has a depth further increasing from the inner diameter of the rear end watertight part to the inner diameter of the front end watertight part.
In the quick connector connecting the pipes,
an inlet portion connected to the pipe;
a front end watertight portion located between the inlet and the outlet;
a rear end watertight part having a smaller inner diameter than the front end watertight part by the height of the step;
a retainer mounted inside the front end watertight part in the axial direction and having the same inner diameter as the rear end watertight part;
an O-ring positioned between the retainer and the step of the rear end watertight part and located on an inner wall of the O-ring of the front end watertight part;
The O-ring formed longer in the axial direction than in the radial direction,
A quick connector, characterized in that a first concave surface is formed on the retainer and a second concave surface is formed on the step so that the contact area of the O-ring is increased by compressive deformation by the inner wall of the O-ring and the pipe.
In the quick connector connecting the pipes,
an inlet portion connected to the pipe;
a front end watertight portion located between the inlet and the outlet;
a rear end watertight part having a smaller inner diameter than the front end watertight part by the height of the step;
a retainer mounted inside the front end watertight part in the axial direction and having the same inner diameter as the rear end watertight part;
a first O-ring and a second O-ring positioned between the retainer and the step of the rear end watertight part and located on an inner wall of the O-ring of the front end watertight part;
a spacer positioned between the first O-ring and the second O-ring;
A first concave surface on the retainer and a second concave surface on the step so that the contact area between the first O-ring and the second O-ring is increased by compressive deformation by the inner wall of the O-ring and the pipe Quick connector, characterized in that .
The method of claim 6,
The first concave surface of the retainer is a quick connector, characterized in that formed along the circumferential direction of the retainer based on the central portion of the surface in contact with the first O-ring.
The method of claim 7,
The quick connector, characterized in that the depth of the first concave surface of the retainer is maximum at the central portion and decreases toward an inner diameter of the rear end watertight portion and an inner diameter of the front end watertight portion around the center portion.
The method of claim 8,
The second concave surface formed on the step of the rear end watertight part has a depth further increasing from the inner diameter of the rear end watertight part to the inner diameter of the front end watertight part.

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