CN214171624U - Joint structure - Google Patents

Abstract

The utility model provides a joint structure relates to connecting device technical field, has solved the easy atress of joint and has warp, the technical problem who leaks. The joint structure comprises a joint inner pipe, wherein the joint inner pipe and the sleeve joint position of a port to be connected form a matching section, and a first reinforcing structure and a separation-preventing structure are arranged on the joint inner pipe in the matching section; the joint inner pipe is also provided with a deformation buffer structure, a sealing element and a clamp; a densification structure is arranged on the sealing element; the clamp includes the portion of cramping and holds between the fingers the handle, and the portion internal diameter of cramping is less than treats the connector external diameter, holds between the fingers the handle and be two, and the cross arrangement just connects respectively at the open end both ends of the portion of cramping. The utility model discloses a little protruding muscle of bulge loop, strengthening rib, buffering ring, sealing washer and can provide the clamp of radial pretightning force, even make the drainage coupling atress drag or bend and also can guarantee its sealed effect to adopt the sealing member of O type circle form, the volume structure is less, reduce cost.

Description

Joint structure

Technical Field

The utility model belongs to the technical field of connecting device technique and specifically relates to a joint design for drain pipe is related to.

Background

The joint position of the drain pipe is a position where the drain pipe is easy to leak water. When the drain pipe is installed on different equipment, the installation environment also has differences, sometimes causes the installation position of the drain pipe to be narrower in order to save space, and the drain pipe can be bent when the pipe running space is insufficient.

The applicant finds that at least the following technical problems exist in the prior art:

in the prior art, the joint position of the drain pipe is easy to deform when stressed, so that water leakage at the joint is caused; in addition, the traditional drain pipe joint does not consider the sealing problem when the drain pipe is pulled or bent under stress to deform the joint, so that the existing sealing structure is easy to lose efficacy and leak water after the joint is deformed under stress.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a joint design to the joint atress that exists among the solution prior art is yielding, leads to the technical problem who leaks.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a pair of joint design, including connecting the inner tube, connect the inner tube and wait that the connector cup joints the position and forms the cooperation section, be located in the cooperation section be provided with the first additional strengthening who increases radial deformation intensity on connecting the inner tube and prevent to connect the inner tube to warp and the anti-disengagement structure who waits the connector to break away from.

As a further improvement of the utility model, the joint inner pipe is further provided with a deformation buffer structure.

As a further improvement, the joint inner tube and the position of waiting for connector contact still are provided with the sealing member, be provided with the densification structure that increases contact pressure on the sealing member.

As a further improvement, the joint design is still including hooping the clamp on the joint inner tube outer wall, the clamp is including hooping the portion and kneading the handle, the internal diameter of hooping the portion is less than and treats the connector external diameter, it is two to knead the handle, and cross arrangement, and connect respectively the open end both ends of hooping the portion.

As a further improvement of the utility model, the clamp is further arranged on the pinching handle and can be connected with the clamping hook of the connector to be connected.

As a further improvement, the utility model also comprises a joint outer pipe outside the joint inner pipe, the clamp is arranged the joint inner pipe protrusion in joint outer pipe department.

As a further improvement of the present invention, the first reinforcing structure is at least one reinforcing rib disposed on the outer wall of the joint inner tube, or is located in the fitting section, the wall thickness of the joint inner tube is greater than the wall thickness of other positions.

As a further improvement of the utility model, the separation-preventing structure is a convex ring arranged on the inner wall of the joint inner tube.

As a further improvement of the present invention, the deformation buffer structure is a buffer ring disposed on the inner wall of the joint inner tube, the buffer ring is disposed between the first reinforcement structure and the head end of the joint inner tube.

As a further improvement, the inner wall of the joint inner tube is provided with a deformation buffer structure and a holding tank between the head ends of the joint inner tube, the sealing element is an O-shaped sealing ring, the sealing ring is clamped in the holding tank in an interference fit manner, and the thickening structure is arranged on at least one convex rib on the inner diameter and/or the outer diameter of the sealing ring.

As a further improvement, the holding tank with the distance between the anti-disengaging structure is a, the width of deformation buffer structure is b, and 0.16a is less than or equal to b and is less than or equal to 0.5 a.

As a further improvement, the joint inner tube outer wall is provided with a clamping groove near the head end, and the clamp card is arranged in the clamping groove.

Compared with the prior art, the utility model following beneficial effect has:

the utility model provides a joint structure can be used as a drain pipe joint and connected on a water outlet, the radial strength of the drain pipe joint in the radial direction is enhanced by arranging a convex ring and a reinforcing rib on the outer wall of an inner pipe on the inner wall of a joint inner pipe, the expansion deformation of the inner pipe matching section in the radial direction is prevented, and the design of a buffer ring of the inner pipe of the drain pipe joint can play a role in buffering the deformation of the drain pipe joint and prevent the deformation of a sealing ring mounting groove from influencing the sealing effect; the sealing ring is provided with the small convex rib structure, the pressure intensity of the small convex rib matching position is greater than that of the peripheral position, the sealing effect is better, and the clamp hoop provides pressing force in the radius direction of the drain pipe joint through the matching of the clamp hoop structure and the drain pipe joint, so that the drain pipe is prevented from falling off; the convex ring design of the inner wall of the inner pipe of the drainage pipe, the reinforcing rib design of the outer wall of the inner pipe, the design of the buffer ring of the inner pipe of the drainage pipe joint, the design of the small convex rib of the sealing ring and the matching of the clamp and the drainage pipe joint ensure that the sealing effect of the drainage pipe joint can be ensured even if the drainage pipe joint is pulled or bent under stress, and the O-shaped ring type sealing piece is adopted, so that the volume structure is small, and the cost can be.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of the joint structure of the present invention and the assembly structure of the water outlet;

FIG. 2 is a schematic view of the joint structure and the water outlet in a semi-sectional exploded view;

FIG. 3 is a sectional view of the joint structure and the water outlet of the present invention;

fig. 4 is a schematic perspective view of the clamp hoop in the joint structure of the present invention;

fig. 5 is a schematic perspective view of a sealing ring in the joint structure of the present invention;

fig. 6 is a schematic cross-sectional view of a sealing ring in the joint structure of the present invention.

10, a drain pipe joint; 100. a joint inner tube; 101. a convex ring; 102. reinforcing ribs; 103. a buffer ring; 104. a card slot; 105. accommodating grooves; 200. a joint outer tube; 300. clamping a hoop; 301. a hoop part; 302. a hook; 303. a handle knob; 400. a seal ring; 401. a rib is protruded; 500. a water outlet; 501. and (5) fixing blocks.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the present invention provides a joint structure, specifically a drain pipe joint 10, for connecting a drain opening 500, and the following description will specifically take a to-be-connected port as an example of the drain opening 500;

as shown in fig. 2 and 3, the drain pipe joint 10 includes a joint inner pipe 100, the joint inner pipe 100 is sleeved on the drain opening 500, a fitting section of the drain pipe joint 10 is formed between the joint inner pipe 100 and the sleeved position of the drain opening 500, and the joint inner pipe 100 in the fitting section is provided with a first reinforcing structure for increasing the radial deformation strength and a separation preventing structure for preventing the joint inner pipe 100 from deforming and separating from the drain opening 500.

Through set up first additional strengthening on connecting inner tube 100, can increase the radial deformation intensity of connecting inner tube 100, that is to say reduce the deformation that connects inner tube 100 and lead to because of radial atress, through set up and prevent breaking away from the structure, when enabling to connect inner tube 100 to warp, guarantee the sealed connection relation between joint inner tube 100 and outlet 500 as far as possible, prevent to lead to the problem of sealed inefficacy and leaking because of warping.

Further, a deformation buffer structure is further disposed on the joint inner pipe 100. By arranging the deformation buffer structure, when the joint inner pipe 100 is deformed to a certain extent, the sealing connection relationship between the joint inner pipe 100 and the water outlet 500 can be still ensured, so that the sealing failure and water leakage problems are avoided.

Further, a sealing member having a densification structure for increasing a contact pressure is provided at a contact position of the joint inner pipe 100 with the drain opening 500. Specifically, the densifying structure is at least one rib 401 disposed on the inner diameter and/or outer diameter of the seal ring 400.

In order to further improve the strength and the sealing performance of the joint structure connection and avoid the occurrence of deformation and water leakage, the joint structure further comprises a hoop 300 hooped on the outer wall of the joint inner pipe 100, specifically, the hoop 300 comprises a hooping part 301 and a pinching handle 303, the hooping part 301 has an opening end, the inner diameter of the hooping part 301 is smaller than the outer diameter of the joint inner pipe 100 so as to provide radial hooping pretightening force through the hooping part 301, the pinching handle 303 is two connected sections respectively connected to the opening ends of the hooping part 301, one of the pinching handles 303 is connected with the opening end through a transition section, the pinching handle 303 crosses over the other pinching handle 303 through the transition section arranged along the circumferential direction of the hooping part 301, the two pinching handles form a cross arrangement structure, the inner diameter of the hooping part 301 can be enlarged when the two pinching handles 303 are meshed, namely the two pinching handles 303 are close to each other, when the inner diameter of the hooping part 301 is enlarged to be larger than the outer diameter of the joint inner pipe 100, the hoop 300 can be conveniently disassembled and assembled, and the hoop part 301 automatically restores after the external force is removed; because the internal diameter is less than the joint inner tube external diameter when natural state of portion of cramping 301, just also can keep cramping sealed to outlet 500 when need not fastener or other locking structure, dismouting clamp 300 only need control two hold between the fingers handle 303 be close to can, in case dismantle or the installation accomplish relieve hold between the fingers handle 303 make its automatic re-setting can, the operation is simple, easy dismounting, high efficiency's characteristics, and through holding between the fingers the handle realization installation or dismantle the back, when detaching external force, the portion of cramping can automatic re-setting to original internal diameter be less than the specification of outlet 500 external diameter, realize the automatic application of pretightning force, have the automatic function of cramping, only need to apply unilateral power and can accomplish dismouting work, it realizes automatic assembly process to facilitate the installation mechanical equipment.

As shown in fig. 4, the hooping part 301 is a circular structure, and the two pinching handles are a first pinching handle and a second pinching handle respectively, the first pinching handle is connected to one end of the opening end through a transition section, and the second pinching handle is connected to the other end of the opening end; the changeover portion is for connecting the structure of connecting in open end one end and extending to the second handle direction of kneading dough, and the changeover portion is in the coplanar basically with the portion 301 of cramping, the changeover portion include along the radial perpendicular outside first section of outwards extending of the portion of cramping and with the first section along the second section of cramping the portion circumference extension, the second section end surpass the second handle of kneading dough after and have the interval between the portion of cramping dough, first handle of kneading dough is connected at the changeover portion is terminal for be the cross arrangement between first handle of kneading dough and the second handle of kneading dough. When the first pinching handle and the second pinching handle are oppositely extruded, the radius of the hooping part can be increased, so that the inner pipe of the joint can be conveniently disassembled and assembled; the value of the distance between the first pinching handle and the second pinching handle is determined according to the size of the joint inner pipe, and particularly, when the pinching handles are pinched to enable the distance between the first pinching handle and the second pinching handle to be 0mm, the inner diameter of the expanded hooping part is larger than the outer diameter of the joint inner pipe, so that the hoop can be easily assembled on the joint inner pipe. The hoop structure is made of stainless steel, has better strength and elastic deformation capacity, and can also be made of materials with similar characteristics and the finished products of which can meet the requirements of strength and deformation.

In the present embodiment, the first tab and the second tab are vertically provided on the pinch portion side.

In this embodiment, the first pinching handle and the second pinching handle have the same shape and are both inverted U-shaped structures, and specifically, each first pinching handle and the second pinching handle includes a first straight section, a transverse section and a second straight section which are sequentially connected, the first straight section extends radially and outwardly along the hooping portion, the first straight section of the first pinching handle and the transition section form a 90-degree included angle structure, and the first straight section of the second pinching handle and the end portion of the opening end form a 90-degree included angle structure; the horizontal section extends along the central axis direction of the hooping part, the horizontal section and the first straight section form a 90-degree included angle structure, and the second straight section and the first straight section are arranged in parallel.

The hook is arranged at the tail end of the second handle. The pothook is including the hook body section that sets gradually, the section of bending and gib head section, hook body section and the plane parallel of the portion place of cramping, the section of bending is 180 degrees bended-arc structures, has the contained angle in order to form the guide hook mouth between gib head section and the hook body section, and the clamp can make the pothook block on the fixed block 501 in outlet through the rotation in circumference to can provide length direction's the pull force in opposite directions for drainage pipe joint and outlet, prevent that the pine between drainage pipe joint and the outlet from taking off.

In order to further improve the connection strength and the connection stability, a fixing block 501 is arranged on the drain opening 500, and a clamping hook 302 capable of being clamped with the fixing block 501 is arranged on one of the handles 303 of the clamp 300.

It should be noted that the utility model discloses in still including cup jointing the joint outer tube 200 in the joint inner tube 100 outside, have the interval between joint outer tube 200 head end and the joint inner tube 100 head end, also be exactly joint outer tube 200 covers in the certain distance department of joint inner tube 100 inboard, clamp 300 sets up in joint inner tube 100 protrusion in joint outer tube 200 department.

Example 1:

as shown in fig. 2 to 6, in the present embodiment, the first reinforcing structure is at least one reinforcing rib 102 provided on the outer wall of the joint inner pipe 100. The separation preventing structure is a convex ring 101 provided on the inner wall of the joint inner pipe 100. The deformation buffer structure is a buffer ring 103 arranged on the inner wall of the joint inner pipe 100; the sealing element is an O-shaped sealing ring 400, and the densification structure is a convex rib 401 arranged at the outer diameter and the inner diameter of the sealing ring 400. The convex ring 101 on the inner wall of the joint inner pipe 100 and the reinforcing rib 102 on the outer wall are designed to play a role of a limiting structure when the drain pipe is installed on the water inlet and outlet 500, and meanwhile, even if the drain pipe joint is bent under stress, the drain pipe joint and the water outlet 500 can still be well matched, so that a good sealing effect of the drain pipe joint is ensured. The sealing ring 400 of the drain pipe joint adopts an O-shaped ring form, the material consumption is less, the cost is low, and the design of the upper convex rib and the lower convex rib of the O-shaped ring can ensure the better sealing effect of the sealing ring. The design of the inner pipe buffer ring 103 of the drain pipe joint can play a role in buffering the deformation of the drain pipe joint, prevent the deformation of the sealing ring mounting groove from influencing the sealing effect, shorten the matching section of the water outlet and the joint, and be favorable for the installation of the water inlet and the water outlet of the drain pipe joint. Buffering ring 103 takes the form of the convex ring, has shortened cooperation segment length L on the one hand, is favorable to the installation of drain pipe joint and outlet, and on the other hand is because the design of buffering ring, when the drain pipe atress takes place to warp, between buffering ring and the holding tank two, compare in the holding tank that is closer from the draw-in groove, deformation takes place earlier for the buffering ring, and release part external force prevents to take place to deform and influence the normal sealing function of sealing washer because external force makes the inside sealing washer of holding tank.

Specifically, the drain pipe joint 10 comprises a joint inner pipe 100 and a joint outer pipe 200 which are sleeved together, wherein the joint outer pipe 200 is positioned on the outermost layer and is adhered to the joint inner pipe 100 through an adhesive, and the joint outer pipe mainly plays roles in protecting the joint inner pipe 100 and preserving heat; an inward-concave annular clamping groove 104 is formed in the position, protruding out of the joint outer pipe 200, of the joint inner pipe 100, the hoop 300 is clamped in the clamping groove 104, and the inner diameter of a hooping portion 301 of the hoop 300 is smaller than the minimum inner diameter of the clamping groove 104; an accommodating groove 105 protruding outwards is formed in the inner wall of the left side of the annular clamping groove 104, namely the side, away from the water outlet 500, of the joint inner pipe 100, an O-shaped sealing ring 400 is in interference fit with the accommodating groove 105, the sealing ring is made of EPDM (ethylene-propylene-diene monomer) materials, has certain elasticity, and can also be made of other materials with elasticity in finished products. The sealing washer is installed in the holding tank, and the holding tank sets up adjacent with the draw-in groove, because the existence of clamp, the difficult deformation that takes place of clamp border and outlet cooperation has guaranteed the good cooperation of sealing washer with the outlet. The sealing ring inner ring and the sealing ring outer ring are respectively provided with a small convex rib, the height of the small convex rib is less than or equal to one tenth of the diameter of the cross section of the sealing ring 400, the small convex rib is pressed flat when the sealing ring 400 is in extrusion fit with the water outlet 500, the pressure intensity of the position of the small convex rib of the sealing ring is greater than the position near the small convex rib, and the sealing effect is better. And the O-shaped ring type sealing ring has small volume, less material consumption and low cost.

As shown in fig. 2, it should be noted that the head end of the outer joint tube 200 is located at a half position of the width of the receiving groove 105, that is, half of the receiving groove 105 is located outside the outer joint tube 200; as the drain pipe joint 10 is easy to deform and bend in the radial direction, as shown in fig. 5 and 6, small convex ribs 401 are arranged on the inner ring and the outer ring of the sealing ring 400, the cross section of each convex rib 401 is rectangular, the pressure between the position of the sealing ring 400 and the accommodating groove 105 is larger by arranging the convex ribs 401, and the sealing effect of the position can be ensured when the drain pipe joint 10 deforms or bends;

it should be noted that the outer diameter of the receiving groove 105 is smaller than the outer diameter of the head end of the joint inner pipe 100.

An outward convex buffer ring 103 is arranged at the left side of the accommodating groove 105, namely, at a position far away from the head end of the joint inner pipe 100, and of course, a certain interval is formed between the buffer ring 103 and the accommodating groove 105; the outside diameter of the cushion ring 103 is equal to the outside diameter of the receiving groove 105.

The width of the cushion ring 103 is b, the distance between the left end surface of the accommodating groove 105 and the left end surface of the cushion ring 103 is a, and the width range of the cushion ring 103 is: b is more than or equal to 0.16a and less than or equal to 0.5 a.

At least one reinforcing rib 102 is arranged on the outer wall of the joint inner pipe 100 positioned on the left side of the buffer ring 103, specifically, as an optional embodiment, two reinforcing ribs 102 are arranged, and the cross section of each reinforcing rib 102 is of a semicircular structure. The reinforcing ribs 102 are arranged on the outer wall of the inner pipe matching section and are used for enhancing the anti-deformation capacity of the inner pipe matching section in the radius direction, the number of the reinforcing ribs can be selected according to the length of the matching section, and two reinforcing ribs are preferably arranged and are respectively arranged at two ends close to the matching section so as to enhance the strength of the opening part of the matching section. If no reinforcing rib is arranged, the effect of enhancing the deformation resistance of the inner pipe matching section in the radius direction can be achieved by increasing the thickness of the inner pipe wall of the matching section, but the use of the inner pipe material is increased, and the cost is increased.

The inner wall of the joint inner pipe 100 positioned at the left side of the reinforcing rib 102, particularly the tail end of the section where the drain pipe joint 10 is matched with the drain port 500, is provided with an annular convex ring 101, the section of the convex ring 101 can be designed into a shape of a semicircle, a triangle and the like, the arrangement of the convex ring 101 and the pipe wall of the inner pipe at the matching section form step mutation to play a role of a limiting structure when the drain pipe is installed with the inlet and the outlet, meanwhile, when the part of the drain pipe joint is bent under stress, the matching section of the drain port and the drain pipe joint has a trend of relative sliding along the length direction and extrusion force along the radius direction, at the moment, the convex ring structure supports the opening part of the drain port, and simultaneously, the arrangement of the convex ring enhances the strength of the pipe wall of the inner pipe in the radius direction, prevents the radial direction of the drain pipe joint from expanding and deforming and the relative sliding of the joint and the drain port, thereby, even if the drain pipe joint is bent under stress, the drain pipe joint and the drain port can still be well matched, and the good sealing effect of the drain pipe joint is ensured.

It should be noted that "inward" is a direction toward the center of the accommodating space, and "outward" is a direction away from the center of the accommodating space.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated based on the orientation or positional relationship shown in fig. 1, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (12)

1. The utility model provides a joint design, its characterized in that, includes the joint inner tube, the joint inner tube forms the cooperation section with treating the connector cup joint position, is located in the cooperation section be provided with the first additional strengthening that increases radial deformation intensity on the joint inner tube and prevent to connect the inner tube deformation and treat the anti-disengagement structure that the connector breaks away from.

2. The joint structure of claim 1, wherein the joint inner tube is further provided with a deformation buffering structure.

3. The joint structure according to claim 2, wherein a sealing member is further disposed at a contact position of the joint inner pipe and the port to be connected, and the sealing member is provided with a density increasing structure for increasing a contact pressure.

4. The joint structure of claim 3, further comprising a clamp hooped on the outer wall of the joint inner tube, wherein the clamp comprises a hooping portion and two pinching handles, the inner diameter of the hooping portion is smaller than the outer diameter of the port to be connected, and the two pinching handles are arranged in a cross manner and connected to two ends of the open end of the hooping portion respectively.

5. The connector structure of claim 4, wherein the clip further includes a hook disposed on the handle for engaging with a port to be connected.

6. The joint structure of claim 4, further comprising an outer joint pipe sleeved outside the inner joint pipe, wherein the clamp is disposed at a position where the inner joint pipe protrudes from the outer joint pipe.

7. The coupling structure of claim 1, wherein the first reinforcing structure is at least one rib provided on an outer wall of the coupling inner pipe, or the coupling inner pipe located in the fitting section has a wall thickness greater than that of the coupling inner pipe located in other positions.

8. The coupling structure of claim 1, wherein the disengagement prevention structure is a raised ring disposed on an inner wall of the coupling inner tube.

9. The coupling structure of claim 2, where the deformation dampening structure is a dampening ring disposed on an inner wall of the fitting inner tube, the dampening ring being located between the first reinforcing structure and the fitting inner tube head end.

10. The joint structure of claim 3, wherein a receiving groove is formed on the inner wall of the joint inner tube between the deformation buffer structure and the head end of the joint inner tube, the sealing element is an O-ring, the sealing ring is engaged with the receiving groove in an interference fit manner, and the density increasing structure is at least one rib disposed on an inner diameter and/or an outer diameter of the sealing ring.

11. The joint structure of claim 10, wherein the distance between the receiving groove and the separation-preventing structure is a, the width of the deformation buffering structure is b, and 0.16a is greater than or equal to b is less than or equal to 0.5 a.

12. The coupling structure of claim 4, wherein a locking groove is formed on an outer wall of the inner pipe of the coupling near the head end, and the clamp is locked in the locking groove.

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