CN212107378U - Plastic quick-insertion three-way joint with leakage-proof one-way valve - Google Patents

Abstract

The utility model belongs to the technical field of the joint technique and specifically relates to a plastics quick-insertion tee joint with leak protection check valve. The plastic quick-insertion three-way joint comprises a shell with a hollow structure and a branch pipe body, wherein the interior of the branch pipe body is communicated with the interior of the shell, a leakage-proof one-way valve is arranged between the branch pipe body and the shell, when a medium is led to the branch pipe body from the shell, the leakage-proof one-way valve is kept at a closed position, and the shell is disconnected with the interior of the branch pipe body; when the medium passes from the branch pipe body to the shell, the leakage-proof one-way valve is pushed to an opening position by the medium, and the branch pipe body is communicated with the interior of the shell. The utility model discloses a three interface of tee joint is inserted soon to plastics with leak protection check valve has quick installation function, and overall structure is small and exquisite light, can save installation space, is convenient for do thermal-insulated protection, and plays the key role to the function of preventing frostbite after the urea nozzle parks at low temperature.

Description

Plastic quick-insertion three-way joint with leakage-proof one-way valve

Technical Field

The utility model belongs to the technical field of the joint technique and specifically relates to a plastics quick-insertion tee joint with leak protection check valve.

Background

The quick connector is a connector which can realize the connection or disconnection of pipelines without tools; the quick installation device is mainly used for quick installation of gas and liquid pipelines.

Please refer to fig. 1, chinese utility model patent with publication number CN201787244U discloses a pipeline quick-operation joint, belongs to the joint field, including the casing, from the top down sets gradually sealing washer one in the casing cavity, interior retaining ring, sealing washer two, outer retaining ring, constitutes a sealing system, and the casing lower part sets up the through-hole, sets up in the through-hole and pulls out the buckle, pulls out the buckle and takes off the buckle by buckle button, buckle area, buckle fastener and constitute, and this pipeline joint has advantages such as easy dismounting, the leakproofness is good, long service life.

Among the present quick-operation joint, be applied to the urea and spray the pipeline and can not effectively prevent nozzle freezing frost crack under the low temperature, urea sprays the pipeline and need external pipeline in addition in order to realize emptying remaining urea solution in nozzle, the urea injection pipeline to cause the urea injection pipeline to become loaded down with trivial details, the installation space increase that quick-operation joint needs.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel plastics that has leak protection check valve of structure insert three way connection soon has quick installation function, small and exquisite light, can save installation space, is convenient for do thermal-insulated protection, and plays the key role to the frostproofing function of urea nozzle low temperature after parking.

In order to achieve the advantages, the plastic quick-plugging three-way joint with the leakage-proof check valve comprises a shell with a hollow structure and a branch pipe body, wherein the interior of the branch pipe body is communicated with the interior of the shell; when the medium passes from the branch pipe body to the shell, the leakage-proof one-way valve is pushed to an opening position by the medium, and the branch pipe body is communicated with the interior of the shell.

The utility model discloses an in the embodiment of the plastics quick-plug tee bend with leak protection check valve, the casing has the receiving link that is used for connecting and first branch connection portion that inserts the link, is used for connecting the branch road body, the branch road body is connected fixedly or welded fastening with this branch connection portion hot melt.

The utility model discloses an in the embodiment of the plastics quick-plug tee bend with leak protection check valve, the branch road body has the second and inserts link, cover and establish the outer connection shaft hole of branch connection portion, be used for holding leak protection check valve hold the shaft hole, the second inserts inside, should hold the shaft hole, should connect and communicate each other between the shaft hole of link, and the radial dimension that should hold the shaft hole anterior segment is less than the radial dimension that should hold the shaft hole back end, and the radial dimension that should hold the shaft hole back end is less than connect the radial dimension in shaft hole.

The utility model discloses an in one embodiment of plastics quick-plug tee bend with leak protection check valve, leak protection check valve includes the first section body of "ten" font structure, the second section body that has the frustum structure, the third section body of cylindric structure, first section body rear end face with second section body front end face is connected, second section body rear end face with third section body front end face is connected.

In an embodiment of the plastic quick-insert three-way joint with leak-proof check valve of the present invention, the end of the first segment that deviates from the second segment is provided with a guide surface, which makes the cross-section of the end gradually decrease.

In an embodiment of the plastic quick-insert three-way joint with the leak-proof check valve of the present invention, the second segment has a closed portion, which faces the cross-section of the first segment and is gradually reduced, the closed portion is used for abutting against the port containing the front segment of the shaft hole to block the fluid passing through.

In an embodiment of the plastic quick-insert three-way joint with the leak-proof check valve of the present invention, the third segment body and the branch pipe connecting portion have therebetween an elastic holding portion for holding the sealing portion against the port accommodating the front segment of the shaft hole.

The utility model discloses an embodiment of the plastics quick-plug tee bend with leak protection check valve, the third section body is global evenly to be arranged the arch of cross-section for L shape, and this arch is established including being used for the cover the portion is established with being used for the restriction to the cover of elasticity retaining part the spacing portion of leak protection check valve displacement range, elasticity retaining part cover is established outside the portion is established to the cover, the tip of its one end supports and leans on the side of spacing portion.

In an embodiment of the plastic quick-insert three-way joint with the leakage-proof check valve of the present invention, the branch pipe connecting portion is provided with a mounting hole for accommodating the elastic holding portion.

In an embodiment of the plastic quick-plug tee joint with the leak-proof check valve of the present invention, the included angles between the receiving connection end and the branch pipe body and between the receiving connection end and the first plug-in connection end are 90 degrees, respectively, and the included angle between the branch pipe body and the first plug-in connection end is 90 degrees; or the included angle between the receiving connecting end and the branch pipe body is 90 degrees, and the central axis of the receiving connecting end and the central axis of the first inserting connecting end are positioned on the same straight line.

The utility model discloses a three interface of tee bend joint is inserted soon to plastics with leak protection check valve has quick installation function, and overall structure is small and exquisite light, can save installation space, is convenient for do thermal-insulated protection, and adapts to heavy vehicle SCR emission control system and use, plays the key effect to the function of preventing frostbite of urea nozzle low temperature after the parking.

Drawings

Fig. 1 is a schematic structural diagram of a conventional pipeline quick coupling.

Fig. 2 is a schematic structural view of a plastic quick-insert three-way joint with a leak-proof check valve according to a first embodiment of the present invention.

Figure 3 is an exploded view of the plastic quick-connect tee of figure 2 with a leak-proof check valve.

FIG. 4 is a cross-sectional view of the plastic quick-connect tee of FIG. 2 with a leak-proof check valve.

FIG. 5 is a top view of the plastic quick-connect tee of FIG. 2 with a leak-proof check valve.

Figure 6 is a cross-sectional view of the bypass body of the plastic quick-connect tee of figure 3 with a leak-proof check valve.

FIG. 7 is a cross-sectional view of the female connection end of the plastic quick-connect three-way fitting of FIG. 3 with a leak-proof check valve.

FIG. 8 is a schematic view of the leak-proof check valve of the plastic quick-connect tee of FIG. 3 having a leak-proof check valve.

Fig. 9 is a schematic structural view of an outer retainer ring of the plastic quick-insert three-way coupling having the leak-proof check valve of fig. 3.

Fig. 10 is a schematic structural view of a plastic quick-insert three-way joint with a leak-proof check valve according to a second embodiment of the present invention.

Figure 11 is a cross-sectional view of the plastic quick-connect tee of figure 10.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the present invention, the following detailed description will be given with reference to the accompanying drawings and preferred embodiments in order to provide the best mode, structure, features and effects according to the present invention.

Referring to fig. 2-3, the plastic quick-insert three-way joint with the leakage-proof check valve according to the first embodiment of the present invention includes a hollow casing 1, and a branch pipe body 2 whose interior is communicated with the interior of the casing 1, wherein the branch pipe body 2 is used for ventilating the interior of the casing 1, the leakage-proof check valve 3 is disposed between the branch pipe body 2 and the casing 1, and the leakage-proof check valve 3 is closed during operation to limit the communication between the casing 1 and the branch pipe body 2; when the work is stopped, the leakage-proof one-way valve 3 is opened, so that the residual medium in the shell 1 is ventilated and emptied between the branch pipe body 2 and the shell 1.

Referring to fig. 4-5, in particular, the housing 1 has a receiving connection end 11 and a first insertion connection end 12 for connection, and a branch connection portion 13 for connection with the branch pipe body 2. The branch pipe body 2 and the branch pipe connecting part 13 are connected and fixed in a hot melting way or welded and fixed. The included angle A and the included angle B between the receiving connecting end 11 and the branch pipe body 2 as well as between the first inserting connecting end 12 are respectively 90 degrees, and the included angle C between the branch pipe body 2 and the first inserting connecting end 12 is 90 degrees. Preferably, the receiving connection end 11, the first inserting connection end 12, and the branch pipe connection portion 13 are integrally formed.

Referring to fig. 2 and 6, the branch pipe body 2 has a second insertion connection end 21, a connection shaft hole 23 sleeved outside the branch pipe connection portion 13, and a receiving shaft hole 24 for receiving the leakage-proof check valve 3. The branch pipe connecting portion 13 is provided with a positioning protrusion 131 and a reinforcing rib 132, and the positioning protrusion 131 is used for limiting the depth of the connecting shaft hole 23 in a sleeved mode, so that hot melting connection or welding is facilitated, and the connection is stable. The reinforcing ribs 132 serve to increase the strength of the branch pipe connection 13 and prevent the occurrence of fracture leakage. The inside of the second insertion connection end 21, the accommodating shaft hole 24 and the connection shaft hole 23 are communicated with each other, the radial dimension of the accommodating shaft hole front section 241 is smaller than that of the accommodating shaft hole rear section 243, and the radial dimension of the accommodating shaft hole rear section 243 is smaller than that of the connection shaft hole 23.

Referring to fig. 7, the receiving connection end 112 has an insertion tube accommodating portion 112a, a seal accommodating portion 112b, and a self-locking accommodating portion 112 c. The insertion tube accommodating portion 112a, the seal accommodating portion 112b, and the self-lock accommodating portion 112c are arranged and fixedly connected from the back to the insertion tube in the direction of the insertion tube. The insertion tube housing portion 112a, the seal housing portion 112b, and the self-lock housing portion 112c are integrally formed, and the insides thereof communicate with each other.

The insertion tube accommodating portion 112a is for accommodating a partial insertion tube (not shown). The inner wall thereof is a cylindrical section, and the inner diameter of the insertion tube housing portion 112a is equal to or larger than the outer diameter of the portion of the insertion tube corresponding to the insertion tube housing portion 112 a.

The seal receiving portion 112b is used for receiving a part of the insert pipe and the inner O-ring 4, the spacer ring 5, the outer O-ring 6, and the outer retainer ring 7. The inner wall of the seal accommodating portion 112b is a smooth cylindrical surface. A smooth cylindrical surface may result in a better sealing effect. The diameter of the cross section of the inner wall of the seal accommodating portion 112b is larger than that of the inner wall of the insertion tube accommodating portion 112 a.

The seal accommodating portion 112b is provided with an outer retainer engaging portion 231 at a position corresponding to the outer retainer 7, and the outer retainer engaging portion 231 includes an outer retainer engaging recess 231a for preventing the outer retainer 7 from moving in the insertion tube direction and an outer retainer blocking surface 231b for preventing the outer retainer 7 from moving away from the insertion tube direction.

The self-locking receiving portion 112c is used for receiving the self-locking device 8, and the self-locking device 8 is used for controlling the removal of the insertion tube, i.e. for limiting the movement of the insertion tube. The side wall of the self-locking accommodating portion 112c is provided with a mounting hole 0 for mounting the self-locking device 8, and the self-locking device 8 is mounted in the self-locking accommodating portion 112c through the mounting hole 0. Be equipped with location arch 01 on the lateral wall of mounting hole 0, from locker 8 is equipped with location arch 01 complex location sunken 81, and location arch 01 is used for preventing from locker 8 from adorning reversely with the cooperation of location sunken 81. The included angle D and the included angle E between the mounting hole 0 and the branch pipe body 2 and between the first inserting connecting end 12 are 45 degrees respectively, so that the self-locking device 8 can be conveniently mounted and dismounted, and meanwhile, the branch pipe body 2 and the first inserting connecting end 12 can be prevented from interfering the operation of the self-locking device 8.

The first insertion connection end 12 and the second insertion connection end 21 have a lock engagement portion 11h and an insertion guide portion 113, respectively. The locking engagement portion 11h is fixed at the middle of the first insertion connection end 12 and the second insertion connection end 21, and the insertion guide portion 113 is fixed at the end of the first insertion connection end 12 and the second insertion connection end 21 away from the receiving connection end 112.

The locking matching part 11h is used for matching with the other corresponding receiving connecting end to realize locking connection. The locking engagement portion 11h is an annular protrusion, and the cross section thereof may be rectangular, square, semicircular, or the like. In other embodiments of the present invention, the locking engagement portion 11h may be a protrusion or a recess fixed to the locking engagement portion 11 h.

The insertion guide portion 113 is used to gradually reduce the outer diameters of the first insertion connection end 12 and the second insertion connection end 21. The insertion guide portion 113 can more conveniently allow the first and second insertion connection terminals 12 and 21 to be inserted into the other corresponding receiving connection terminals. The cross section of the insertion guide portion 113 is a circular ring with a sector-shaped cross section, and the inner diameter of the insertion guide portion 113 is the same as the inner diameter of the first insertion connection end 12 and the second insertion connection end 21, respectively. Further, the inner diameters of the insertion guide portions 113 may not be equal to the inner diameters of the first and second insertion connection ends 12 and 21, respectively.

Further, in the present invention, the first inserting connection end 12 is a male connector with a specification of 7.89 mm. The second plug-in connection end 21 is a male connector of the gauge 9.49 mm. The receiving connection end 11 is a female connector with the specification of 7.89 mm.

Referring to fig. 8, the leakage-proof check valve 3 comprises a first section 31 of a cross-shaped structure, a second section 32 of a frustum structure, and a third section 33 of a cylindrical structure. The rear end face of the first section 31 is connected with the front end face of the second section 32, and the rear end face of the second section 32 is connected with the front end face of the third section 33. The radial dimension of the second segment 32 is larger than the radial dimensions of the first segment 31 and the third segment 33.

The first section 31 is accommodated in the accommodating shaft hole front section 241, the volume of the gas in the accommodating shaft hole front section 241 is increased by adopting a cross-shaped structure, and the leakage-proof check valve 3 is pushed to move towards the second section 32 to easily open the leakage-proof check valve 3. The end of the first section 31 facing away from the second section 32 is provided with a guiding surface 311, and the guiding surface 311 gradually reduces the cross section of the end for easy installation. The second segment 32 is accommodated in the accommodating shaft hole rear segment 243, and the second segment 32 has a closed portion 321, and the closed portion 321 is a frustum structure. The closure 321 is adapted to abut against a port receiving the shaft bore front section 241 to block the passage of fluid. The section of the sealing part 321 towards the first section 31 is gradually reduced, so that the sealing part 321 and the port of the shaft hole front section realize coil sealing, and the sealing effect is good. Between the third segment 33 and the branch pipe connecting portion 13, there is an elastic holding portion t that holds the closing portion 321 against the port that receives the shaft hole front segment 241.

The outer peripheral surface of the third segment 33 is uniformly provided with L-shaped protrusions 331, and the protrusions 331 include a sleeve portion 331a for sleeving the elastic retaining portion t and a limiting portion 331b for limiting the moving range of the leakage-proof check valve 3. The branch pipe connecting portion 13 is provided with a mounting hole 130 for receiving the elastic holder t. The elastic holding portion t is sleeved outside the sleeving portion 331a, and an end of one end of the elastic holding portion t abuts against a side surface of the limiting portion 331b, and an end of the other end abuts against a bottom of the mounting hole 130. The radial dimension of the mounting hole 130 is larger than the maximum distance between the sleeving parts 331a and smaller than the maximum distance between the limiting parts 331 b.

Preferably, the elastic holding portion t is a compression spring. The first segment 31, the second segment 32 and the third segment 33 are integrally formed. The leakproof check valve 3 is preferably made of EPDM, but is not limited to NBR, HNBR, FKM and the like.

Referring to fig. 3 and 8-9, the inner O-ring 4 is circular and has a circular cross-section. When the insertion tube is inserted into the receiving connection end 112, the inner O-ring 4 is located between the insertion tube and the receiving connection end 112, i.e. the inner O-ring 4 is sleeved outside the insertion tube. The circular diameter of the cross-section of the inner O-ring 4 is larger than the gap between the insert tube and the receiving connection end 112. The inner O-ring 4 is made of fluoro-rubber (FKM). The fluororubber has oil resistance, chemical resistance, good physical and mechanical properties, weather resistance, electrical insulation, radiation resistance and the like which are not possessed by other rubbers.

The isolating ring 5 is circular ring-shaped, and the section of the isolating ring is rectangular. Spacer ring 5 is between inner O-ring 4 and outer O-ring 6. The isolating ring 5 is made of glass fiber modified nylon. The spacer ring 5 is used to secure the distance between the inner O-ring 4 and the outer O-ring 6 to secure the sealing effect. When the insertion tube is inserted into the receiving connection 112, the spacer ring 5 is located between the insertion tube and the receiving connection 112, i.e. the spacer ring 5 is fitted outside the insertion tube. The cross-section of the spacer ring 5 may also be circular, square or other shape.

The outer O-ring 6 is circular and has a circular cross-section. When the insertion tube is inserted into the receiving connection end 112, the inner O-ring 4 is located between the insertion tube and the receiving connection end 112, i.e. the outer O-ring 6 is sleeved outside the insertion tube. The circular diameter of the cross-section of the outer O-ring 6 is larger than the gap between the insert tube and the receiving connection end 112. The outer O-ring 6 is made of fluorosilicone rubber (FVMQ), and has the characteristics of common rubber, and also has excellent properties of aviation-resistant fuel oil, hydraulic oil, engine oil, chemical reagents, solvents and the like. Can work for a long time at-55 to +200 ℃.

Referring to fig. 9, the outer retainer 7 is used to prevent the inner O-ring 4, the spacer ring 5, and the outer O-ring 6 from loosening. The outer retainer 7 includes an outer retainer stopper 71 and an outer retainer body 72. The cross section of the outer retainer body 72 is a rectangular ring. The outer retainer limiting portion 71 is fixed to a side of the outer retainer body 72 facing away from the center of the circle. The outer retainer limiting portion 71 has a circular arc plate-shaped structure with certain elasticity, and a free end is arranged on a side of the outer retainer limiting portion facing away from the outer retainer main body 72.

The outer retainer ring 7 is made of glass fiber modified nylon. When the insertion tube is inserted into the receiving connection 112, the outer collar 7 is located between the insertion tube and the receiving connection 112, i.e. the outer collar 7 is fitted outside the insertion tube. In other embodiments of the present invention, the cross section of the outer retainer 7 may also be circular, square or other shapes.

The outer collar engaging portion 231 of the receiving connection end 112 engages the outer collar retaining portion 71 to achieve the retaining. An outer retainer rotating portion 73 is provided on a side surface of the outer retainer 7 facing the insert pipe, and the outer retainer rotating portion 73 is used for controlling the position of the outer retainer limiting portion 71 when the outer retainer 7 is mounted. The outer retainer 7 can be conveniently rotated until it is mounted in place due to the outer retainer rotating portion 73. In this embodiment, the outer retainer rotating portion 73 is a groove penetrating the outer retainer body 72, and the cross section of the groove is rectangular. In other embodiments of the present invention, the outer retainer rotating portion 7 may also be a hole, a protrusion, or the like that may or may not be through.

Referring to fig. 10 to 11, in the plastic quick-insert three-way joint with the leakage-proof check valve according to the second embodiment of the present invention, the difference from the plastic quick-insert three-way joint with the leakage-proof check valve according to the first embodiment is: the included angle A between the receiving connecting end 11 and the branch pipe body 2 is 90 degrees, and the central axis of the receiving connecting end 11 and the central axis of the first inserting connecting end 12 are positioned on the same straight line.

The plastic quick-insertion three-way joint with the leakage-proof check valve has the working principle that: the plastic quick-insertion three-way joint with the leakage-proof one-way valve is mainly applied to a urea injection pipeline, when the urea injection pipeline is pressurized to work, the leakage-proof one-way valve 3 is in a closed state, the conduction between the branch pipeline body 2 and the shell 1 is limited, the urea is normally injected by a nozzle, and the urea cannot enter the branch pipeline body 2 (namely, the urea is prevented from leaking out of the branch pipeline body 2); when stopping and closing the power, branch pipe body 2 can be to the casing 1 internal ventilation period, and leak protection check valve 3 can be in the open mode when ventilating, clears up nozzle and urea injection pipeline's remaining urea solution, prevents that the nozzle from freezing the frost crack under the low temperature.

The utility model discloses a three interface of tee bend joint is inserted soon to plastics with leak protection check valve has quick installation function, and overall structure is small and exquisite light, can save installation space, is convenient for do thermal-insulated protection, and adapts to heavy vehicle SCR emission control system and use, plays the key effect to the function of preventing frostbite of urea nozzle low temperature after the parking.

In the utility model, the plastic quick-insertion three-way joint with the leakage-proof check valve is provided with the leakage-proof check valve, so that the urea solution can be prevented from leaking from the branch pipe body; the branch pipe body can ventilate in the casing, can empty the remaining urea solution of nozzle and urea injection pipeline, avoids under the low temperature nozzle or urea injection pipeline freezing frost crack.

The utility model discloses in, the first section body of leak protection check valve adopts "ten" font structure to increase gaseous volume in holding the shaft hole anterior segment to it is easy to promote the removal of leak protection check valve orientation second section body direction, and the leak protection check valve is opened easily, and the branch road body is effectual ventilates in order to accomplish the clear work of urea solution of remaining with nozzle and urea injection pipeline in the casing.

The utility model discloses in, the branch pipe connecting portion of casing passes through hot melt with the branch road body and is connected or the welding, makes and can install the leak protection check valve between casing and the branch road body.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with the preferred embodiment, it is not limited to the present invention, and any skilled person can make modifications or changes equivalent to the above embodiments without departing from the scope of the present invention, but all the modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are within the scope of the present invention.

Claims (10)

1. A plastic quick-inserting three-way joint with a leakage-proof one-way valve comprises a shell with a hollow structure and a branch pipe body, wherein the interior of the branch pipe body is communicated with the interior of the shell; when the medium passes from the branch pipe body to the shell, the leakage-proof one-way valve is pushed to an opening position by the medium, and the branch pipe body is communicated with the interior of the shell.

2. The plastic quick-insert three-way joint with leak-proof check valves as claimed in claim 1, wherein the housing has a receiving connection end and a first insert connection end for connection, a branch pipe connection portion for connecting a branch pipe body, and the branch pipe body is fixed by thermal fusion or welding to the branch pipe connection portion.

3. The plastic quick-insert three-way joint with the leakage-proof check valve as claimed in claim 2, wherein the branch pipe body has a second insert connection end, a connection shaft hole sleeved outside the branch pipe connection portion, and a containing shaft hole for containing the leakage-proof check valve, the second insert connection end, the containing shaft hole and the connection shaft hole are communicated with each other, the radial dimension of the front section of the containing shaft hole is smaller than that of the rear section of the containing shaft hole, and the radial dimension of the rear section of the containing shaft hole is smaller than that of the connection shaft hole.

4. The plastic quick-insert three-way joint with the leakage-proof one-way valve according to claim 3, wherein the leakage-proof one-way valve comprises a first segment body with a cross-shaped structure, a second segment body with a frustum structure and a third segment body with a cylindrical structure, the rear end face of the first segment body is connected with the front end face of the second segment body, and the rear end face of the second segment body is connected with the front end face of the third segment body.

5. The plastic quick-insert three-way joint with leak-proof check valve of claim 4, wherein the end of said first segment body facing away from said second segment body is provided with a guide surface which gradually reduces the cross section of said end.

6. The plastic quick-insert three-way joint with leak-proof check valve according to claim 4, wherein said second segment has a closing portion with a section gradually decreasing toward the first segment, said closing portion being adapted to abut against a port of the front section of said receiving shaft hole to block the passage of fluid.

7. The plastic quick-insert three-way joint with leak-proof check valve as claimed in claim 6, wherein an elastic holding portion for holding the closing portion against the port of the front section of the receiving shaft hole is provided between the third segment body and the branch pipe connecting portion.

8. The plastic quick-insert three-way joint with the leakage-proof check valve as claimed in claim 7, wherein the third section has a protrusion with an L-shaped cross section uniformly arranged on the outer peripheral surface thereof, the protrusion comprises a sleeve portion for sleeving the elastic retaining portion and a limiting portion for limiting the movement range of the leakage-proof check valve, the elastic retaining portion is sleeved outside the sleeve portion, and the end of one end of the elastic retaining portion abuts against the side surface of the limiting portion.

9. The plastic quick-insert three-way joint with leak-proof check valve according to claim 7, wherein said branch pipe connecting portion is provided with a mounting hole for receiving said elastic holder.

10. The plastic quick-insert three-way joint with the leak-proof check valve according to claim 2, wherein the included angles between the receiving connection end and the branch pipe body and the first insert connection end are 90 ° respectively, and the included angle between the branch pipe body and the first insert connection end is 90 °; or the included angle between the receiving connecting end and the branch pipe body is 90 degrees, and the central axis of the receiving connecting end and the central axis of the first inserting connecting end are positioned on the same straight line.

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