Buckling and pressing type connector

Abstract

The invention relates to the technical field of pipeline joints, in particular to a buckling and pressing type joint which comprises an inner pipe, an outer pipe, a hose, a fixing piece and a connecting structure. An outer pipe sleeves the outer side of the inner pipe and is used for being matched with the inner pipe to clamp the hose between the outer side surface of the inner pipe and the inner side surface of the outer pipe; a fixing piece is arranged at one end of the inner pipe, and the connecting structure is used for detachably connecting the fixing piece with one end of the outer pipe. The inner pipe and the outer pipe are connected by arranging the fixing piece and the connecting structure, the connecting stability of the connector is improved, the possibility that the hose drives the outer pipe to move relative to the inner pipe is reduced, and the possibility that the phenomenon of whipping off occurs is reduced; the movement of the outer pipe is limited, so that the possibility that the hose drives the outer pipe to move relative to the inner pipe is reduced, and the reliability and the safety of the device are improved.

Description

Technical Field

[0001] This invention relates to the field of pipe fitting technology, and specifically to a crimp-type fitting. Background Technology

[0002] Fluid pipelines, as crucial channels for transmitting fluid media, primarily consist of two types: flexible hoses and rigid pipes. Compared to rigid pipes, flexible hoses are more widely used in automotive, mining equipment, construction machinery, building, and railway transportation due to their advantages such as flexible routing, ease of processing, and lower cost. Flexible hoses typically require connectors to connect to other pipelines. Crimping connectors are a common type, generally consisting of an inner tube and an outer tube fitted over it. The inner and outer tubes have serrated edges on their adjacent walls. During connection, the flexible hose is inserted between the inner and outer tubes, and a specialized crimping device is used to squeeze the outer tube, thus securing the hose between the inner and outer tubes. However, the inner tube is usually directly connected to other pipelines. During use, vibrations and pull-out stresses from these other pipelines act directly on the flexible hose. Especially when transporting high-pressure liquids, the greatest risk is the inner tube detaching from the flexible hose, causing whiplash and splashing of high-pressure liquid, threatening the safety of surrounding personnel.

[0003] In existing technology, a flexible tube is sleeved on the outside of an inner tube, and an outer tube is sleeved on the outside of a flexible tube. The outer tube is used to clamp the flexible tube with the inner tube. However, the outer tube and the inner tube are not connected, resulting in unreliable fixation of the flexible tube by the outer tube. The outer tube may move relative to the inner tube under the influence of the flexible tube. During the process of transporting liquid, the flexible tube will bear a large pressure from the fluid medium. Under pressure, the flexible tube may drive the outer tube to move relative to the inner tube, causing the flexible tube to detach from the inner tube. After the flexible tube detaches from the inner tube, it will swing at high speed, causing a whip-like phenomenon, which may easily cause the outer tube to collide with other objects, resulting in damage to the outer tube or posing a hazard to on-site personnel. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide a crimp-type connector to solve the problem that in the prior art, the outer tube and the inner tube are not connected, resulting in unreliable fixation of the hose by the outer tube and the inner tube. During the process of transporting liquid, the hose will bear a large pressure transmitted by the fluid medium. Under pressure, the hose may drive the outer tube to move relative to the inner tube, causing the hose to detach from the inner tube.

[0005] A crimp-type connector includes an inner tube, an outer tube, a flexible hose, a fixing element, and a connecting structure; An outer tube is sleeved on the outside of the inner tube. The outer tube is used to cooperate with the inner tube to clamp the hose between the outer side of the inner tube and the inner side of the outer tube. One end of the inner tube is provided with a fixing component, and the connecting structure is used to detachably connect the fixing component to one end of the outer tube.

[0006] Furthermore, the fastener has several strip-shaped holes arranged circumferentially, and the connecting structure includes a connecting rod. One end of the connecting rod is provided with an abutting part that can abut against the fastener, and the other end of the connecting rod passes through the strip-shaped holes and is threaded to one end of the outer tube.

[0007] Furthermore, a nut is connected to one end of the connecting rod near the outer tube, and the nut is used to abut against the side of the fixing member away from the abutment part.

[0008] Furthermore, the fastener is annular, and the inner wall of the fastener is threadedly connected to the outer wall of the inner tube.

[0009] Furthermore, one end of the hose is provided with a first variable diameter section for facilitating the insertion of one end of the inner tube, and a movable ring is slidably connected to the inner side of the end of the inner tube near the hose, with one end of the movable ring inserted into the first variable diameter section.

[0010] Furthermore, the movable ring includes a first ring body and a second ring body coaxially connected; a second variable diameter section is provided at one end of the inner tube near the flexible tube, the first ring body is inserted into the second variable diameter section and slidably connected to the second variable diameter section, and the second ring body is inserted into the first variable diameter section.

[0011] Furthermore, the inner side of the second variable diameter section is a tapered inner wall that gradually narrows in the direction away from the first variable diameter section in the inner radial direction, and the outer side of the first ring body is a tapered outer wall that gradually increases in the direction close to the second ring body in the outer radial direction.

[0012] Furthermore, the outer wall of the inner tube is provided with several annular reverse teeth, and the inner wall of the outer tube is provided with several first annular bosses; the first annular bosses are used to cooperate with the annular reverse teeth to limit the hose.

[0013] Furthermore, the annular inverted teeth are provided with a transition surface near the hose, the transition surface is used to abut against the hose, and the transition surface is an arc-shaped surface or a wavy curved surface.

[0014] Furthermore, the inner wall of the outer tube is provided with a plurality of second annular protrusions, and the second annular protrusions are provided on the side of the first annular protrusions near the fixing member; the outer wall of the inner tube is provided with a plurality of third annular protrusions, and the third annular protrusions are used to cooperate with the second annular protrusions to limit the hose.

[0015] Beneficial effects: By setting up fixing parts and connecting structures to connect the inner and outer tubes, the stability of the joint connection is improved, the possibility of the hose driving the outer tube to move relative to the inner tube is reduced, and the possibility of whiplash is reduced; the movement of the outer tube is limited, reducing the possibility of the hose driving the outer tube to move relative to the inner tube, thus improving the reliability and safety of the device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the specification will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 for Figure 1 A sectional perspective view; Figure 3 for Figure 2 Enlarged view of part B in the middle; Figure 4 for Figure 2 A schematic diagram of the cross-sectional structure of the inner tube shown; Figure 5 for Figure 2 A schematic diagram of the cross-sectional structure of the outer tube shown; Figure 6 Diagram showing hose installation; Figure 7 for Figure 6 A sectional view; Figure 8 for Figure 7 Enlarged view of a section in the middle C; Figure 9 for Figure 7 The diagram shows a cross-sectional view of the hose.

[0018] In the diagram: 1. Inner tube; 11. Second diameter reducing section; 12. Annular reverse tooth; 121. Transition surface; 13. Third annular boss; 2. Outer tube; 21. First annular boss; 22. Second annular boss; 23. Mounting hole; 3. Fixing component; 31. Strip hole; 4. Connecting structure; 41. Abutment part; 42. Nut; 43. Connecting rod; 5. Flexible hose; 51. First diameter reducing section; 6. Moving ring; 61. First ring body; 62. Second ring body. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. For ease of explanation, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "inner," "outer," "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] It should be noted that the embodiments and features involved in the embodiments of this invention can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0021] like Figures 1-9 The crimped connector shown includes an inner tube 1, an outer tube 2, a flexible hose 5, a fixing element 3, and a connecting structure 4; An outer tube 2 is fitted on the outside of the inner tube 1. The outer tube 2 is used to cooperate with the inner tube 1 to clamp the hose 5 between the outer side of the inner tube 1 and the inner side of the outer tube 2. One end of the inner tube 1 is provided with a fixing member 3, and the connecting structure 4 is used to detachably connect the fixing member 3 to one end of the outer tube 2.

[0022] In this embodiment, the inner tube 1 and the outer tube 2 are connected by setting the fixing component 3 and the connecting structure 4, which improves the stability of the joint connection and makes the fixing of the hose 5 by the outer tube 2 and the inner tube 1 more reliable. The movement of the outer tube 2 is limited, which reduces the possibility of the hose 5 driving the outer tube 2 to move relative to the inner tube 1, thereby improving the reliability and safety of the device.

[0023] The fastener 3 has several strip holes 31 arranged circumferentially. The connecting structure 4 includes a connecting rod 43. One end of the connecting rod 43 is provided with an abutting part 41 that can abut against the fastener 3. The other end of the connecting rod 43 passes through the strip holes 31 and is threaded to one end of the outer tube 2.

[0024] In this embodiment, the outer tube 2 is deformed by a dedicated crimping device, and the part where the outer tube 2 is connected to the connecting rod 43 will move in position as the outer tube 2 deforms; the width of the strip hole 31 is greater than the diameter of the connecting rod 43, which is used to provide a range of movement or activity for the connecting rod 43, so as to prevent the connecting rod 43 from abutting against the inner wall of the strip hole 31 when it moves with the contraction and deformation of the outer tube 2, which would cause the connecting rod 43 to deform; the outer diameter or width of the abutting part 41 is greater than the width of the strip hole 31, and the abutting part 41 is used to cooperate with the strip hole 31 to limit the movement distance of the connecting rod 43 along the length direction of the connecting rod 43.

[0025] A nut 42 is connected to one end of the connecting rod 43 near the outer tube 2. The nut 42 is used to abut against the side of the fixing member 3 away from the abutment part 41.

[0026] In this embodiment, when only the abutment part 41 is provided, during normal use of the device, the hose 5 tends to move away from the fixing member 3. However, after the water pump connected to the hose 5 stops working, the water in the hose 5 will recede. At this time, the hose 5 tends to move closer to the fixing member 3. Therefore, it is possible that the hose 5 will drive the outer tube 2 to move closer to the fixing member 3. As a result, the reciprocating movement of the hose 5 will cause the hose 5 to deform, and the inner diameter at the first diameter-changing section 51 will expand. The deformation of the hose 5 will increase the possibility of pull-out. By providing the nut 42, which abuts against the fixing member 3, the movement of the outer tube 2 can be restricted, thereby further limiting the position of the hose 5 and reducing the possibility of pull-out.

[0027] In another embodiment, the end of the connecting rod 43 near the outer tube 2 is not provided with a nut 42, but a slot is provided on the connecting rod 43. The slot is used for inserting and removing the pin. One side of the pin can abut against the side of the fixing member 3 away from the abutment part 41. The relative position of the outer tube 2 and the fixing member 3 is fixed by the cooperation of the pin and the slot. The specific shape and position of the pin and the slot are set as existing technology and can be obtained by those skilled in the art.

[0028] The fastener 3 is ring-shaped, and the inner wall of the fastener 3 is threadedly connected to the outer wall of the inner tube 1.

[0029] In this embodiment, the fixing member 3 is threadedly connected to the inner tube 1, ensuring reliable fixation and facilitating installation and disassembly. The relative position of the outer tube 2 and the inner tube 1 can be adjusted by rotating the fixing member 3.

[0030] In the above embodiments, the abutment part 41 and the connecting rod 43 are integrally formed, which is convenient for manufacturing and use. At the same time, the abutment part 41 and the fixing member 3 can withstand strong tensile force. In another embodiment, the abutment part 41 is another nut 42 that is threadedly connected to the connecting rod 43. The two nuts 42, together with the connecting rod 43, can adjust the distance between the fixing member 3 and the outer tube 2, thereby adjusting the relative position of the outer tube 2 and the inner tube 1.

[0031] One end of the flexible tube 5 is provided with a first reducing section 51 for easy insertion of one end of the inner tube 1.

[0032] In this embodiment, as Figure 9 As shown, one end of the flexible tube 5 is provided with a first diameter-reducing section 51. The inner diameter of the first diameter-reducing section 51 is larger and thinner than the inner diameter of the other sections of the flexible tube 5, which makes it easier to insert the inner tube 1 and deform according to the shape or texture of the outer surface of the inner tube 1.

[0033] A movable ring 6 is slidably connected to the inner side of the inner tube 1 near the flexible tube 5, and one end of the movable ring 6 is inserted into the first diameter reducing section 51.

[0034] In this embodiment, when the crimping device presses the outer tube 2 to deform it, the outer tube 2 and the inner tube 1 will squeeze the hose 5, causing the first variable diameter section 51 of the hose 5 to deform. The length of the first variable diameter section 51 will increase, and the distance between the end of the first variable diameter section 51 away from the inner tube 1 and the end of the inner tube 1 that is close to it will increase. This will expose a portion of the first variable diameter section 51 to the fluid medium in the hose 5, and the pressure of the fluid medium will act directly on the first variable diameter section 51. After deformation, the first variable diameter section 51 becomes thinner overall, and the limit of the internal pressure it can withstand will decrease. The part of the first variable diameter section 51 in contact with the fluid medium will be pressured and protrude outward, so that the first variable diameter section 51 can... The hose may be damaged, and the fluid medium will come into contact with the end face of the hose 5 facing the inner tube 1, generating a thrust that moves the hose 5 away from the inner tube 1; the moving ring 6 is slidably connected to the inner side of the inner tube 1. When the hose 5 is deformed by the outer tube 2 and the inner tube 1, the hose 5 will drive the moving ring 6 to slide; before and after the hose 5 is deformed, one end of the moving ring 6 is in contact with the end face of the hose 5 or there is only a small gap between it and the end face. The moving ring 6 can cover the inner surface of the first diameter section 51, thereby preventing the fluid medium from coming into contact with the inner surface of the first diameter section 51 or reducing or even preventing the fluid medium from coming into contact with the end face of the hose 5, generating a force that moves the hose 5 away from the inner tube 1.

[0035] The movable ring 6 includes a first ring body portion 61 and a second ring body portion 62 coaxially connected. A second diameter-reducing section 11 is provided at one end of the inner tube 1 near the flexible tube 5. The first ring body portion 61 is inserted into and slidably connected to the second diameter-reducing section 11, while the second ring body portion 62 is inserted into the first diameter-reducing section 51. The outer diameter of the first ring body portion 61 is adapted to the second diameter-reducing section 11, and the outer diameter of the first ring body portion 61 is smaller than the outer diameter of the second ring body portion 62. The outer diameter of the second ring body portion 62 is greater than or equal to the inner diameter of the first diameter-reducing section 51.

[0036] In this embodiment, the first ring body 61 and the second ring body 62 are integrally formed; both the first ring body 61 and the second ring body 62 are made of metal materials, which can indirectly increase the thickness of the first variable diameter section 51 or the second variable diameter section 11, and at the same time improve the compressive strength of the first variable diameter section 51 or the second variable diameter section 11, and also reduce the impact of the eddy current phenomenon caused by the gap between the moving ring 6 and the end face inside the hose 5 on the fluid medium transportation efficiency.

[0037] The inner side of the second diameter-changing section 11 is a tapered inner wall that gradually narrows in the direction away from the first diameter-changing section 51 in the inner radial direction, and the outer side of the first ring body 61 is a tapered outer wall that gradually increases in the direction close to the second ring body 62 in the outer radial direction.

[0038] In this embodiment, when the inner tube 1 deforms, the interaction between the conical outer wall and the conical inner wall can push the moving ring 6 towards the hose 5 and correspondingly reduce the gap between the second ring body 62 and the inner end face of the hose 5. The matching of the conical outer wall and the conical inner wall can effectively improve the sealing effect between the moving ring 6 and the inner tube 1.

[0039] The end of the second diameter-changing section 11 away from the first diameter-changing section 51 is provided with a tapered or arc-shaped inclined surface whose inner diameter gradually decreases in the direction away from the first diameter-changing section 51.

[0040] In this embodiment, after the moving ring 6 moves towards the direction of the hose 5, the conical or arc-shaped inclined surface will be exposed to the fluid medium, which will guide the flow of the fluid medium.

[0041] The inner tube 1 has several annular inverted teeth 12 arranged around its outer wall, and the outer tube 2 has several first annular protrusions 21 arranged on its inner wall. The first annular protrusions 21 are used to cooperate with the annular inverted teeth 12 to limit the hose 5. The annular inverted teeth 12 are spaced apart along the length of the inner tube 1, and the first annular protrusions 21 are spaced apart along the length of the outer tube 2.

[0042] In this embodiment, after the outer tube 2 is pressed by the clamping device, the first annular protrusion 21 moves closer to the annular inverted tooth 12 and squeezes the hose 5, causing the hose 5 to partially sink between the adjacent first annular protrusion 21 or the adjacent annular inverted tooth 12, and be squeezed by the annular inverted tooth 12 and the first annular protrusion 21 respectively; the annular inverted tooth 12 is partially inserted between the adjacent first annular protrusion 21, and the annular inverted tooth 12, together with the first annular protrusion 21 on both sides, limits the annular inverted tooth 12, thereby limiting the relative position of the inner tube 1 and the outer tube 2. With the squeezing of the hose 5 by the annular inverted tooth 12 and the first annular protrusion 21, the movement gap between the inner tube 1 and the outer tube 2 is further reduced, resulting in the relative fixation of the positions of the inner tube 1 and the outer tube 2. The tilt angle of the annular inverted tooth 12 is set to A, 10°≤A≤45°. If the tilt angle of the annular inverted tooth 12 is too small, it will weaken the biting depth and reduce the anti-dislodgement performance; if the tilt angle is too large, it will cause stress to concentrate on the top of the annular inverted tooth 12, which may easily damage the hose 5. The inclination angle of the annular inverted teeth 12 is limited to 10° to 45°, which can both disperse stress and ensure sufficient engagement depth. Furthermore, the material of the hose 5 can fully fill the gap between the annular inverted teeth 12 and the first annular boss 21, thereby reducing high-pressure fluid leakage.

[0043] The annular inverted tooth 12 is provided with a transition surface 121 near the hose 5. The transition surface 121 is used to abut against the hose 5. The transition surface 121 is an arc-shaped surface or a wavy curved surface.

[0044] In this embodiment, the shape of the transition surface 121 is designed to prevent the annular teeth 12 from pressing deep indentations on the hose 5 and to prevent sharp points from scratching the inner wall of the hose 5, thus causing damage to the inner wall of the hose 5.

[0045] The inner wall of the outer tube 2 is provided with a plurality of second annular protrusions 22, which are located on the side of the first annular protrusion 21 near the fixing member 3; the outer wall of the inner tube 1 is provided with a plurality of third annular protrusions 13, which are used to cooperate with the second annular protrusions 22 to limit the hose 5. The plurality of second annular protrusions 22 are spaced apart along the length of the outer tube, and the plurality of third annular protrusions 13 are spaced apart along the length of the inner tube 1.

[0046] In this embodiment, an annular groove is formed between adjacent second annular protrusions 13, and the third annular protrusion 13 is used to press a portion of the hose 5 into the annular groove to limit the corresponding portion of the hose 5 and reduce the possibility of the hose 5 being pulled out.

[0047] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if these modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include these modifications and modifications.

Claims

1. A press-fit joint, characterized in that The utility model provides a pipe fixing device, which comprises an inner tube, an outer tube, a hose, a fixing piece and a connecting structure. The outer tube is sleeved outside the inner tube and is used for clamping the hose between the outer side surface of the inner tube and the inner side surface of the outer tube. One end of the inner tube is provided with the fixing piece, and the connecting structure is used for detachably connecting the fixing piece with one end of the outer tube.

2. A press-on connector according to claim 1, characterised in that The fixing piece is provided with a plurality of strip-shaped holes in the circumferential direction, and the connecting structure comprises a connecting rod, one end of the connecting rod is provided with an abutting portion capable of abutting against the fixing piece, and the other end of the connecting rod is threadedly connected with one end of the outer tube through the strip-shaped hole.

3. A press-on connector according to claim 2, wherein One end of the connecting rod close to the outer tube is connected with a nut, and the nut is used for abutting against the side surface of the fixing piece away from the abutting portion.

4. A press-fit joint according to any one of claims 1-3, characterised in that The fixing piece is annular, and the inner wall of the fixing piece is threadedly connected with the outer wall of the inner tube.

5. A press-on connector according to claim 4, wherein One end of the hose is provided with a first reducing section for facilitating insertion of one end of the inner tube, and one end of the inner tube close to the hose is slidably connected with a moving ring, and one end of the moving ring is inserted into the first reducing section.

6. A press-on connector according to claim 5, wherein The moving ring comprises a first ring body portion and a second ring body portion coaxially connected, one end of the inner tube close to the hose is provided with a second reducing section, the first ring body portion is inserted into the second reducing section and is slidably connected with the second reducing section, and the second ring body portion is inserted into the first reducing section.

7. A press-on connector according to claim 6, wherein The inner side of the second reducing section is a conical inner wall gradually reduced in the direction away from the first reducing section, and the outer side of the first ring body portion is a conical outer wall gradually increased in the direction close to the second ring body portion.

8. A press-on connector according to claim 1, wherein The outer wall of the inner tube is provided with a plurality of annular reverse teeth, and the inner wall of the outer tube is provided with a plurality of first annular bosses; the first annular bosses are used for limiting the hose in cooperation with the annular reverse teeth.

9. A press-on connector according to claim 8, wherein The annular reverse teeth close to the hose are provided with a transition surface used for abutting against the hose, and the transition surface is an arc surface or a wavy curved surface.

10. A press-on connector according to claim 8 or 9, characterised in that The inner wall of the outer tube is provided with a plurality of second annular bosses, and the second annular bosses are arranged on the side of the first annular bosses close to the fixing piece; the outer wall of the inner tube is provided with a plurality of third annular bosses, and the third annular bosses are used for limiting the hose in cooperation with the second annular bosses.

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