High-sealing-performance combined type oil pipe joint

Abstract

The invention discloses a high-tightness combined oil pipe joint, which belongs to the technical field of oil pipe joints, and comprises an oil duct pipe and an oil injection joint combined with the oil duct pipe, a fixed lantern ring is fixedly installed outside the oil injection connector, a plurality of guide sliding rods are connected to the fixed lantern ring in a penetrating mode at equal angles, a front moving lantern ring is fixedly installed on the guide sliding rods, the oil injection connector is sleeved with the front moving lantern ring in a sliding mode, and the front moving lantern ring corresponds to the surface of the limiting ring in an attached mode; a limiting mechanism for elastically limiting the moving position of the front moving lantern ring is arranged outside the oil injection joint; a sealing mechanism for improving the installation sealing performance of the oil injection joint and the oil duct pipe is further arranged outside the oil injection joint; the limiting mechanism and the sealing mechanism can improve the sealing performance of the assembly structure between the oil injection connector and the oil duct pipe, and the situation that oil leaks when the oil pipe connector is used is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipe joints, in particular to a high-sealability combined oil pipe joint. Background Art

[0002] Oil pipe joints are divided into straight, right-angle, tee, cross and other forms according to the direction of the passage. They are key components that connect oil pipes to hydraulic components, oil pipes to mounting plates and other equipment. Their main functions are to achieve the firmness of the connection, the reliability of the seal and the convenience of installation. In terms of material and performance requirements, the material of the oil pipe joint is usually alloy structural steel to ensure its corrosion resistance and mechanical strength under high temperature and high pressure environments. The design of the joint also needs to consider the sealing performance.

[0003] For example, the patent with publication number CN107631113B discloses a quick-install and disassemble oil pipe joint, including an outer joint and an inner joint, the inner joint is connected to the inner part of the outer joint by a movable lock, when the movable lock is in a locked state, the inner joint is fixed on the outer joint, and when the movable lock is in an unlocked state, the inner joint and the outer joint can move relative to each other; the movable lock includes an inner joint cover movably connected to the outer ring of the inner joint, the inner joint cover includes a wedge-shaped block at the front end and a rotating connecting ring at the rear end, a circle of locking grooves is provided on the inner joint, a cavity is provided at the rear end of the outer joint, an elastic positioning sleeve is provided in the cavity, the elastic positioning sleeve includes an elastic member adapted to both the locking groove and the wedge-shaped block, an outer joint cover is provided at the rear end of the outer joint, the middle of the outer joint cover abuts against the inner joint cover, when the elastic member is in an unlocked state, the wedge-shaped block of the inner joint cover moves forward to squeeze the elastic member and compress the elastic member until it is completely out of the locking groove, thereby completing the unlocking; Another example is a patent with publication number CN217056733U that discloses a quick-connect oil pipe connector, including a connector body, the connector body including an inlet section and an outlet section, the inlet section and the outlet section are internally connected; a limiting sleeve is sleeved on the outside of the inlet section, the outer wall of the limiting sleeve is provided with an elastic locking block, and the outer wall of the inlet section is provided with an avoidance groove, so that when the quick-connect connector is installed on the injector, the elastic locking block can shrink toward the avoidance groove, and the elastic locking block is locked with the slot of the injector when the elastic locking block recovers its deformation; the quick-connect connector can be installed in the injector by using the avoidance groove on the connector body and the elastic locking block on the sleeve to achieve The quick-connect connector limiter involves a small number of parts, simple assembly and processing, and can improve the installation efficiency of the quick-connect connector; however, during the assembly process of the above-mentioned oil pipe connector, the fit between the sealing ring and the pipe wall is affected, and the connection sealing between it and the oil pipe is limited, resulting in the fluid inside the oil pipe leaking from the connector, which not only wastes resources but also may cause pollution to the equipment and the environment. In addition, after installation, some oil pipe connectors and oil pipes are affected by axial tension, internal pressure or bending load, resulting in uneven distribution of contact stress on the sealing surface of the connector, making the oil pipe connector installation structure loose, thereby affecting the sealing of the oil pipe connector installation.

[0004] In view of the above problems, it is urgent to carry out innovative design based on the original oil pipe joint. Summary of the invention

[0005] The purpose of the present invention is to provide a highly sealed combined oil pipe joint to solve the problem in the above-mentioned background technology that during the assembly process of the oil pipe joint, the fit between the sealing ring and the pipe wall is affected, and the connection sealing between the oil pipe and the oil pipe is limited, resulting in the fluid inside the oil pipe leaking from the joint, which not only wastes resources but also may cause pollution to the equipment and the environment.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a highly sealed combined oil pipe joint, comprising an oil channel pipe and an injection joint installed in combination with the oil channel pipe, the oil channel pipe having an internal thread at the open end position, and a limit ring fixedly installed on the inner wall of the oil channel pipe, an external thread provided on the outer wall of the injection joint, and the injection joint being threadedly connected to the oil channel pipe through the external thread and the internal thread; a fixed sleeve ring is fixedly installed on the outside of the injection joint, and a plurality of guide slide bars are connected through the fixed sleeve ring at equal angles, a front movable sleeve ring is fixedly installed on the guide slide bar, and the front movable sleeve ring is slidably sleeved on the outside of the injection joint, and the front movable sleeve ring is fitted and corresponds to the surface of the limit ring; a limit mechanism for elastically limiting the moving position of the front movable sleeve ring is provided on the outside of the injection joint; a sealing mechanism for increasing the sealing performance of the installation of the injection joint with the oil channel pipe is also provided on the outside of the injection joint.

[0007] Preferably, an outer sealing ring is embedded in the outside of the front movable ring, and the outer sealing ring fits with the inner wall of the oil channel pipe; an inner sealing ring is embedded in the inside of the front movable ring, and the inner sealing ring fits with the outer wall of the injection joint; a lateral sealing ring is fixedly connected to the side of the front movable ring away from the limit ring.

[0008] Preferably, a lateral groove is provided on a side of the fixed collar close to the front movable collar, and the fixed collar is snap-connected with the lateral sealing ring via the lateral groove.

[0009] Preferably, the limiting mechanism includes a polygonal sleeve fixed to the outside of the injection joint, and a plurality of guide rings are fixed at equal angles on the polygonal sleeve and the fixed sleeve; a positioning plate is arranged between the polygonal sleeve and the two corresponding guide rings on the fixed sleeve, the positioning plate is fixedly installed on the outside of the guide slide rod, a main limiting spring is connected between the positioning plate and the guide ring on the fixed sleeve, and a secondary limiting spring is connected between the positioning plate and the guide ring on the polygonal sleeve.

[0010] Preferably, the guide slide rod is slidably connected to the guide ring, and the guide slide rod is elastically connected to the guide rings on both sides through a positioning piece, a main limit spring and a secondary limit spring.

[0011] Preferably, the sealing mechanism includes positioning bevel grooves opened at equal angles on the outer side of the polygonal sleeve, the plane on which the positioning bevel grooves are opened on the outer side of the polygonal sleeve is an inclined structure, and a longitudinal sliding rod is slidably connected in the positioning bevel groove; primary sealing blocks and secondary sealing blocks are fixed on multiple longitudinal sliding rods outside the polygonal sleeve at intervals along the circumferential direction.

[0012] Preferably, the outer side surfaces of the primary sealing block and the secondary sealing block are both arc-shaped structures, and the ends of the primary sealing block and the secondary sealing block close to the positioning bevel groove are parallel to the outer edge of the polygonal sleeve; the secondary sealing block is symmetrically provided with grooves on both sides, and the grooves on both sides of the secondary sealing block are fit and connected with the inner planes of the primary sealing blocks on both sides.

[0013] Preferably, the external sliding sleeve of the injection joint is provided with a rear movable ring, and the rear movable ring is fixedly connected to the guide slide rod, and a plurality of positioning straight grooves are provided at equal angles on the surface of one end of the rear movable ring close to the polygonal sleeve, a transverse slide rod is slidingly connected in the positioning straight groove, and a third-level sealing block is fixedly installed on the transverse slide rod; the plurality of third-level sealing blocks corresponding to the side of the rear movable ring are respectively fixedly connected to the first-level sealing block and the second-level sealing block.

[0014] Preferably, the fuel injection joint is provided with a snap mechanism for reinforcing the stability of its assembly with the oil channel pipe.

[0015] Preferably, the buckle mechanism includes a plurality of blocks fixed at equal angles on the front movable ring, a plurality of slots corresponding to the positions of the blocks are opened at equal angles on the limit ring, the blocks are snap-connected with the slots, and the contact surfaces between the blocks and the slots are inclined along the radial direction, and the contact surfaces between the blocks and the slots along the circumferential direction are arc-shaped.

[0016] Compared with the prior art, the beneficial effect of the present invention is that when the high-sealing combined oil pipe joint is installed on the injection joint and the oil channel pipe, the front movable ring outside the injection joint is pressed onto the limit ring inside the oil channel pipe, the outer sealing ring of the front movable ring is attached to the inner wall of the oil channel pipe, the inner sealing ring of the front movable ring is attached to the outer wall of the injection joint, and at the same time the lateral sealing ring on the front movable ring is clamped on the fixed ring, and the sealing effect of the connection between the injection joint and the oil channel pipe can be increased by multiple sealing rings.

[0017] Furthermore, a limiting mechanism is provided on the outside of the fuel injection joint. During the installation of the fuel injection joint thread and the oil channel pipe, the front movable ring contacts the surface of the limiting ring, and the limiting ring pushes the front movable ring toward the fixed ring. A guide slide rod is connected to the front movable ring, and the guide slide rod can elastically limit its corresponding moving position on the outside of the fuel injection joint through a main limiting spring and a secondary limiting spring, thereby helping the front movable ring to move and seal between the oil channel pipe and the fuel injection joint.

[0018] Furthermore, a sealing mechanism is also provided on the outside of the fuel injection joint. During the directional movement of the front movable sleeve, the guide slide rod pushes the rear movable sleeve to move synchronously, and the rear movable sleeve pushes the primary sealing block, the secondary sealing block and the tertiary sealing block to move laterally. At this time, the primary sealing block and the secondary sealing block move obliquely along the direction of the positioning bevel groove, and the primary sealing block and the secondary sealing block push the tertiary sealing block to move linearly along the direction of the positioning straight groove, so that the primary sealing block and the secondary sealing block move outward and expand. The expanded primary sealing block and the secondary sealing block are squeezed on the inner wall of the oil channel pipe, and the force is stable, thereby improving the sealing performance of the combined installation of the fuel injection joint.

[0019] During the movement of the primary sealing block and the secondary sealing block, the grooves on the sides of the primary sealing block and the secondary sealing block are always fitted and connected, keeping the primary sealing block and the secondary sealing block in a tightly connected state during the movement.

[0020] Furthermore, a snap mechanism is provided on the outside of the fuel injection joint. During the process of the front movable sleeve moving and fitting with the limiting ring, the clamping block on the front movable sleeve contacts the edge of the limiting ring, and the protruding part of the clamping block elastically opens under force. When the fuel injection pipeline is completely installed on the oil channel pipe, the clamping block is engaged in the clamping groove, thereby reinforcing the connection between the front movable sleeve and the limiting ring, thereby reinforcing the connection state between the fuel injection joint and the oil channel pipe, and avoiding loose connection after the fuel injection joint is assembled, which affects the sealing effect of the assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the fuel injection joint of the present invention.

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the oil channel pipe of the present invention.

[0023] Figure 3 It is a structural schematic diagram of the present invention in which the fuel injection joint and the oil channel pipe are separated.

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the front movable sleeve ring of the present invention.

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the fixing ring of the present invention.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the rear movable sleeve ring of the present invention.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the limiting ring of the present invention.

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the outer sealing ring of the present invention.

[0029] Fig. 9It is a schematic diagram of the three-dimensional structure of the inner sealing ring of the present invention.

[0030] Fig.10 It is a schematic diagram of the three-dimensional structure of the polygonal sleeve of the present invention.

[0031] Fig.11 It is a schematic diagram of the cross-sectional structure of the primary sealing block of the present invention.

[0032] Fig.12 It is a schematic diagram of the three-dimensional structure of the guide slide bar of the present invention.

[0033] Fig.13 It is a schematic diagram of the cross-sectional structure of the limiting ring of the present invention.

[0034] Fig.14 It is a schematic diagram of the three-dimensional structure of the positioning piece of the present invention.

[0035] Fig.15 It is a schematic diagram of the three-dimensional structure of the card block of the present invention.

[0036] In the figure: 1. oil channel pipe; 2. injection joint; 3. internal thread; 4. limit ring; 5. external thread; 6. fixed collar; 7. guide slide bar; 8. front movable collar; 9. outer sealing ring; 10. inner sealing ring; 11. lateral sealing ring; 12. lateral groove; 13. polygonal sleeve; 14. guide ring; 15. positioning piece; 16. main limit spring; 17. auxiliary limit spring; 18. positioning inclined groove; 19. longitudinal slide bar; 20. primary sealing block; 21. secondary sealing block; 22. rear movable collar; 23. positioning straight groove; 24. transverse slide bar; 25. tertiary sealing block; 26. clamping block; 27. clamping groove; 28. cutting groove. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figure 1-Figure 15The present invention provides the following technical solutions: a highly sealed combined oil pipe joint, comprising an oil channel pipe 1 and an injection joint 2 assembled with the oil channel pipe 1, an internal thread 3 is provided at the internal opening end of the oil channel pipe 1, and a limit ring 4 is fixedly installed on the inner wall of the oil channel pipe 1, an external thread 5 is provided on the outer wall of the injection joint 2, and the injection joint 2 is threadedly connected with the oil channel pipe 1 through the external thread 5 and the internal thread 3; a fixed collar 6 is fixedly installed on the outside of the injection joint 2, and a plurality of guide slide bars 7 are connected and penetrated at equal angles on the fixed collar 6, a front movable collar 8 is fixedly installed on the guide slide bar 7, and the front movable collar 8 is slidably sleeved on the outside of the injection joint 2, and the front movable collar 8 is in contact with the surface of the limit ring 4; a limit mechanism for elastically limiting the moving position of the front movable collar 8 is provided on the outside of the injection joint 2; a sealing mechanism for increasing the sealing performance of the installation of the injection joint 2 with the oil channel pipe 1 is also provided on the outside of the injection joint 2.

[0039] An outer sealing ring 9 is installed on the outside of the front movable ring 8, and the outer sealing ring 9 fits with the inner wall of the oil channel pipe 1; an inner sealing ring 10 is installed on the inside of the front movable ring 8, and the inner sealing ring 10 fits with the outer wall of the injection joint 2; a lateral sealing ring 11 is fixedly connected to the side of the front movable ring 8 away from the limit ring 4.

[0040] A lateral groove 12 is formed on one side of the fixed collar 6 close to the front movable collar 8 , and the fixed collar 6 is engaged and connected with the lateral sealing ring 11 via the lateral groove 12 .

[0041] The limiting mechanism includes a polygonal sleeve 13 fixed to the outside of the injection joint 2, and a plurality of guide rings 14 are fixed at equal angles on the polygonal sleeve 13 and the fixed sleeve 6; a positioning piece 15 is arranged between the polygonal sleeve 13 and the corresponding two guide rings 14 on the fixed sleeve 6, the positioning piece 15 is fixedly installed on the outside of the guide slide rod 7, a main limiting spring 16 is connected between the positioning piece 15 and the guide ring 14 on the fixed sleeve 6, and a secondary limiting spring 17 is connected between the positioning piece 15 and the guide ring 14 on the polygonal sleeve 13.

[0042] The guide slide bar 7 penetrates and is slidably connected to the guide ring 14 , and the guide slide bar 7 is elastically connected to the guide rings 14 on both sides through the positioning piece 15 , the main limit spring 16 , and the auxiliary limit spring 17 .

[0043] The sealing mechanism includes a positioning bevel groove 18 opened at an equal angle on the outer side of the polygonal sleeve 13. The plane of the positioning bevel groove 18 opened on the outer side of the polygonal sleeve 13 is an inclined structure, and a longitudinal slide rod 19 is slidably connected in the positioning bevel groove 18; a primary sealing block 20 and a secondary sealing block 21 are fixed on multiple longitudinal slide rods 19 outside the polygonal sleeve 13 at intervals along the circumferential direction.

[0044] The outer side surfaces of the primary sealing block 20 and the secondary sealing block 21 are both arc-shaped structures, and the ends of the primary sealing block 20 and the secondary sealing block 21 close to the positioning inclined groove 18 are parallel to the outer edge of the polygonal sleeve 13; the secondary sealing block 21 is symmetrically provided with grooves 28 on both sides, and the grooves 28 on both sides of the secondary sealing block 21 are fitted and connected with the inner planes of the primary sealing blocks 20 on both sides.

[0045] The external sliding sleeve of the injection joint 2 is provided with a rear movable ring 22, and the rear movable ring 22 is fixedly connected to the guide slide bar 7, and a plurality of positioning straight grooves 23 are provided at equal angles on the surface of one end of the rear movable ring 22 close to the polygonal sleeve 13, a transverse slide bar 24 is slidingly connected in the positioning straight groove 23, and a third-level sealing block 25 is fixedly installed on the transverse slide bar 24; a plurality of third-level sealing blocks 25 corresponding to the side of the rear movable ring 22 are respectively fixedly connected to the first-level sealing block 20 and the second-level sealing block 21.

[0046] When assembling the fuel injection joint 2 and the oil channel pipe 1, the fuel injection joint 2 is threadedly rotated and installed into the oil channel pipe 1 through the external thread 5 and the internal thread 3. During the assembly process, the front movable collar 8 outside the fuel injection joint 2 contacts the surface of the limit ring 4 on the inner wall of the oil channel pipe 1. The position of the front movable collar 8 is limited by the limit ring 4. It is sleeved on the outside of the fuel injection joint 2 and slides in a directional manner. The front movable collar 8 drives the guide slide bar 7 to slide through the guide ring 14. The guide slide bar 7 drives the positioning piece 15 to move synchronously. The positioning piece 15 controls the elastic extension of the main limit spring 16, and the positioning piece 15 controls the elastic compression of the auxiliary limit spring 17. Under the elastic adjustment action of the spring 16 and the auxiliary limit spring 17, the moving positions of the guide slide rod 7 and the front movable ring 8 are limited, the outer sealing ring 9 on the front movable ring 8 fits on the inner wall of the oil channel pipe 1, and the inner sealing ring 10 on the front movable ring 8 fits on the outer wall of the injection joint 2. When the injection joint 2 and the oil channel pipe 1 are fully assembled, the front movable ring 8 moves to fit on the side of the fixed ring 6 outside the injection joint 2, and the lateral sealing ring 11 on the front movable ring 8 is engaged in the lateral groove 12 on the side of the fixed ring 6. The engagement structure of the lateral sealing ring 11 increases the sealing of the assembly of the injection joint 2 and the oil channel pipe 1.

[0047] The guide slide bar 7 drives the rear moving collar 22 sleeved on the outside of the injection joint 2 to move synchronously while moving. The rear moving collar 22 drives the tertiary sealing block 25, the secondary sealing block 21 and the primary sealing block 20 to move synchronously. The primary sealing block 20 and the secondary sealing block 21 are correspondingly arranged on the inclined surface outside the polygonal sleeve 13. The primary sealing block 20 and the secondary sealing block 21 move obliquely along the positioning oblique groove 18 provided on the external inclined surface of the polygonal sleeve 13. During the movement, the tertiary sealing block 25 fixed on the side of the primary sealing block 20 and the secondary sealing block 21 slides along the direction of the positioning straight groove 23 , the primary sealing block 20 and the secondary sealing block 21 move and expand, and the outer arc surfaces of the primary sealing block 20 and the secondary sealing block 21 after expansion form a complete circular structure, and the primary sealing block 20 and the secondary sealing block 21 are evenly squeezed and fit on the inner wall of the oil channel pipe 1, and during the expansion process, the primary sealing block 20 always keeps in contact with the groove 28 on the side of the secondary sealing block 21, so that the circumferentially distributed primary sealing blocks 20 and secondary sealing blocks 21 are more tightly and completely protected on the inner side of the oil channel pipe 1, further increasing the sealing effect of the assembly between the injection joint 2 and the oil channel pipe 1.

[0048] Embodiment 2: Based on Embodiment 1, a snap mechanism is further disclosed, and its specific structure is as follows: a snap mechanism is provided on the injection joint 2 to reinforce the stability of its assembly with the oil channel pipe 1; the snap mechanism includes a plurality of blocks 26 fixed at equal angles on the front movable ring 8, and a plurality of slots 27 corresponding to the positions of the blocks 26 are provided at equal angles on the limit ring 4, the blocks 26 are snap-connected with the slots 27, and the contact surfaces of the blocks 26 and the slots 27 along the radial direction are in an inclined structure, and the contact surfaces of the blocks 26 and the slots 27 along the circumferential direction are in an arc-shaped structure.

[0049] During the installation of the injection joint 2 and the oil channel pipe 1, the front movable collar 8 is in contact with the surface of the limit ring 4. Since the position of the limit ring 4 fixed inside the oil channel pipe 1 is limited, during the rotation and installation of the injection joint 2, the front movable collar 8 is subjected to the resistance of the limit ring 4, and the multiple blocks 26 on the outer end surface of the front movable collar 8 are in contact with the side of the limit ring 4 to elastically deform, and the blocks 26 elastically open outward. When the injection joint 2 is completely assembled with the oil channel pipe 1, the moving position of the block 26 corresponds to the position of the groove 27 on the limit ring 4. The block 26 is no longer subjected to the pressure of the outer wall of the limit ring 4 at this time, and the block 26 returns to a normal state. At this time, the block 26 is engaged and connected with the groove 27. The engaged block 26 can reinforce the front movable collar 8 and the limit ring 4, thereby maintaining the stability of the installation structure between the injection joint 2 and the oil channel pipe 1, and avoiding the situation where the injection joint 2 is loosely installed and the sealing is reduced.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly sealed combined oil pipe joint, comprising an oil passage pipe (1) and an oil injection joint (2) assembled with the oil passage pipe (1), characterized in that: An internal thread (3) is formed at the internal open end of the oil channel pipe (1), and a limit ring (4) is fixedly installed on the inner wall of the oil channel pipe (1); an external thread (5) is formed on the outer wall of the oil injection joint (2), and the oil injection joint (2) is threadedly connected to the oil channel pipe (1) via the external thread (5) and the internal thread (3); The outside of the fuel injection joint (2) is fixedly mounted with a fixed collar (6), and a plurality of guide slide bars (7) are connected and penetrated at equal angles on the fixed collar (6), and a front movable collar (8) is fixedly mounted on the guide slide bar (7), and the front movable collar (8) is slidably sleeved on the outside of the fuel injection joint (2), and the front movable collar (8) is in contact with and corresponds to the surface of the limit ring (4); The outside of the fuel injection joint (2) is provided with a limiting mechanism for elastically limiting the moving position of the front moving collar (8); The outside of the oil injection joint (2) is also provided with a sealing mechanism for increasing the sealing performance of the oil injection joint and the oil channel pipe (1) during installation.

2. The high-sealability combined oil pipe joint according to claim 1, characterized in that: An outer sealing ring (9) is mounted on the outside of the front movable sleeve ring (8), and the outer sealing ring (9) is in contact with the inner wall of the oil channel pipe (1); An inner sealing ring (10) is embedded in the front movable sleeve ring (8), and the inner sealing ring (10) is in contact with the outer wall of the fuel injection joint (2); A side sealing ring (11) is fixedly connected to the side of the front movable sleeve ring (8) away from the limiting ring (4).

3. The high-sealability combined oil pipe joint according to claim 2, characterized in that: A lateral groove (12) is provided on a side of the fixed collar (6) close to the front movable collar (8), and the fixed collar (6) is snap-fitted and connected to the lateral sealing ring (11) via the lateral groove (12).

4. The high-sealability combined oil pipe joint according to claim 1, characterized in that: The limiting mechanism comprises a polygonal sleeve (13) fixed to the outside of the fuel injection joint (2), and a plurality of guide rings (14) are fixed at equal angles on the polygonal sleeve (13) and the fixed sleeve ring (6); A positioning piece (15) is provided between the polygonal sleeve (13) and the two corresponding guide rings (14) on the fixed sleeve (6). The positioning piece (15) is fixedly mounted on the outside of the guide slide bar (7). A main limit spring (16) is connected between the positioning piece (15) and the guide ring (14) on the fixed sleeve (6), and a secondary limit spring (17) is connected between the positioning piece (15) and the guide ring (14) on the polygonal sleeve (13).

5. The high-sealability combined oil pipe joint according to claim 4, characterized in that: The guide slide bar (7) penetrates and is slidably connected to the guide ring (14), and the guide slide bar (7) is elastically connected to the guide rings (14) on both sides via a positioning piece (15), a main limit spring (16), and an auxiliary limit spring (17).

6. The high-sealability combined oil pipe joint according to claim 1, characterized in that: The sealing mechanism comprises a positioning bevel groove (18) provided at an equal angle on the outer side of the polygonal sleeve (13); the plane of the positioning bevel groove (18) provided on the outer side of the polygonal sleeve (13) is in an inclined structure; a longitudinal sliding rod (19) is slidably connected in the positioning bevel groove (18); A primary sealing block (20) and a secondary sealing block (21) are fixed at intervals along the circumferential direction on a plurality of longitudinal sliding rods (19) outside the polygonal sleeve (13).

7. The high-sealability combined oil pipe joint according to claim 6, characterized in that: The outer side surfaces of the primary sealing block (20) and the secondary sealing block (21) are both in an arc-shaped structure, and one end of the primary sealing block (20) and the secondary sealing block (21) close to the positioning inclined groove (18) is parallel to and corresponds to the outer edge of the polygonal sleeve (13); The secondary sealing block (21) has grooves (28) symmetrically formed on both sides, and the grooves (28) on both sides of the secondary sealing block (21) are fitted and connected to the inner planes of the primary sealing blocks (20) on both sides thereof.

8. The high-sealability combined oil pipe joint according to claim 6, characterized in that: The outer sliding sleeve of the fuel injection joint (2) is provided with a rear movable sleeve ring (22), and the rear movable sleeve ring (22) is fixedly connected to the guide slide rod (7), and a plurality of positioning straight grooves (23) are formed at equal angles on the surface of one end of the rear movable sleeve ring (22) close to the polygonal sleeve (13), a transverse slide rod (24) is slidably connected in the positioning straight groove (23), and a three-stage sealing block (25) is fixedly installed on the transverse slide rod (24); A plurality of third-level sealing blocks (25) corresponding to the side of the rear movable collar (22) are respectively fixedly connected to the first-level sealing block (20) and the second-level sealing block (21).

9. The high-sealability combined oil pipe joint according to claim 1, characterized in that: The oil injection joint (2) is provided with a snap mechanism for reinforcing the assembly stability between the oil injection joint and the oil channel pipe (1).

10. The high-sealability combined oil pipe joint according to claim 9, characterized in that: The buckle mechanism comprises a plurality of clamping blocks (26) fixed at equal angles on the front movable sleeve ring (8); a plurality of clamping grooves (27) corresponding to the positions of the clamping blocks (26) are provided at equal angles on the limit ring (4); the clamping blocks (26) and the clamping grooves (27) are clamped and connected; the clamping blocks (26) and the clamping grooves (27) have an inclined structure along the radial contact surface; and the surfaces of the clamping blocks (26) and the clamping grooves (27) in contact along the circumferential direction have an arc-shaped structure.

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