CN118775638A - Pipe connection structure - Google Patents

Abstract

The present invention provides a pipe connection structure. The pipe connection structure comprises: a first pipe segment, a first connection portion is provided on the outer periphery of the first pipe segment; a second pipe segment, a second connection portion is provided on the outer periphery of the second pipe segment, and the second pipe segment is suitable for being axially connected to the first pipe segment; a connecting sleeve, a third connection portion adapted to the first connection portion and a fourth connection portion adapted to the second connection portion are provided on the connecting sleeve, so as to be suitable for keeping the second pipe segment on the first pipe segment and being able to rotate circumferentially relative to the first pipe segment. The pipe connection structure of the present invention enables the first pipe segment and the second pipe segment connected to each other to rotate relative to each other in the circumferential direction.

Description

Pipe connection structure

Technical Field

The invention belongs to the technical field of pipe fitting connection, and particularly relates to a pipe connection structure.

Background

In the prior art, the abutting pipe elements are often fixed to each other in the axial direction, the radial direction and the circumferential direction after being connected. In some application scenarios, two butted pipes are required to rotate circumferentially relative to each other, so that the medium in the guiding pipe can flow to different directions, or the guiding pipe is suitable for occasions where two butted pipes rotate circumferentially relative to each other. Thus, a new pipe connection structure is required to solve the technical problem.

Disclosure of Invention

In view of the above-mentioned technical problems, the present invention provides a pipe connection structure capable of enabling a butted first pipe section and second pipe section to be rotatable relative to each other in a circumferential direction.

To this end, the present invention provides a pipe connection structure comprising: a first pipe section, the outer periphery of which is provided with a first connecting part; a second pipe section provided with a second connecting portion at an outer periphery thereof, the second pipe section being adapted to be axially coupled to the first pipe section; the connecting sleeve is provided with a third connecting part matched with the first connecting part and a fourth connecting part matched with the second connecting part, so that the second pipe section is suitable for being kept at the first pipe section and can rotate circumferentially relative to the first pipe section.

The present invention may further include any one or more of the following alternative forms according to the technical idea described above.

In some alternatives, the connecting sleeve is sleeved with the second pipe section, one of the second connecting portion and the fourth connecting portion comprises a clamping rib, the other of the second connecting portion and the fourth connecting portion comprises an annular rib matched with the clamping rib, and the connecting sleeve and the second pipe section can circumferentially rotate through mutual cooperation of the clamping rib and the annular rib.

In some alternatives, the snap beads are configured as a plurality of snap lugs circumferentially spaced apart. The clamping convex blocks and the annular ribs have smaller contact areas, so that friction force can be reduced, and the rotation resistance of the second pipe section relative to the first pipe section is smaller.

In some alternatives, the first connection portion includes an annular housing extending radially outward from the outer periphery of the first tube segment and parallel to the axial direction, the annular housing forming an annular receiving cavity with the outer side wall of the first tube segment, the connection sleeve being adapted to be inserted into the annular receiving cavity to form a radial stop with the first tube segment.

In some optional forms, the first connecting portion includes a plurality of clamping holes arranged on the annular housing at intervals in the circumferential direction, the third connecting portion includes a plurality of clamping hooks arranged on the outer side wall of the connecting sleeve at intervals in the circumferential direction, and the first pipe section and the connecting sleeve achieve mutual limiting in the axial direction and the circumferential direction through clamping of the clamping holes and the clamping hooks.

In some alternatives, a resilient snap rib is provided in the snap hole extending parallel to the axial direction of the first tube section, the resilient snap rib being adapted to hold the snap hook into place in the snap hole.

In some alternatives, the free end of the resilient snap rib is bent at an angle towards the annular receiving cavity to form an inclined section, the snap hook has a wedge-shaped hook portion protruding radially outwards, the wedge-shaped hook portion has an abutment surface adapted to abut the free end of the resilient snap rib and a mounting ramp connected to the abutment surface, the mounting ramp is adapted to slip with the inclined section of the resilient snap rib.

In some alternatives, the outer sidewall of the connecting sleeve is circumferentially spaced apart with a plurality of first engagement projections, and the inner sidewall of the annular housing is circumferentially spaced apart with a plurality of second engagement projections; at least one of the first fitting projections is adapted to be fitted into a space between adjacent second fitting projections, and/or at least one of the second fitting projections is adapted to be fitted into a space between adjacent first fitting projections. After the embedded connection sleeve is embedded, the capacity of resisting external side pulling force between the connection sleeve and the first pipe section is increased, and the overall strength of the system is further enhanced.

In some alternatives, the tube connection structure further comprises a sealing ring, the second tube segment comprising a sealing cartridge extending parallel to the axial direction, the sealing cartridge being adapted to be inserted into the annular receiving cavity, an annular cavity being formed between an inner side wall of the sealing cartridge and an outer side wall of the first tube segment adapted to receive the sealing ring.

In some alternative forms, there is one of the following: a) The outer side wall of the sealing cylinder shell is provided with a first bulge, and the first bulge is in contact with the inner side wall of the connecting sleeve; b) The inside wall of connecting sleeve is provided with the second arch, the second arch with the lateral wall contact of sealed shell. The configuration of the first projection/second projection provides a smaller contact surface between the seal cartridge housing and the coupling sleeve relative to direct surface contact, thereby reducing friction and providing a lower rotational resistance of the second tube segment relative to the first tube segment.

In some alternatives, the first projection is configured as a first projection, and the outer side wall of the sealed cartridge housing is provided with a plurality of first projections, which are arranged axially and/or circumferentially on the outer side wall of the sealed cartridge housing.

In some alternatives, the second projection is configured as a second projection, the inner side wall of the connection sleeve being provided with a plurality of the second projections, the plurality of the second projections being arranged axially and/or circumferentially on the inner side wall of the connection sleeve.

In some alternatives, the inner side wall of the second pipe section is provided with an annular shoulder, the first pipe section is sleeved with the second pipe section, and the abutting end of the first pipe section is in contact with the contact end face of the annular shoulder.

In some alternative forms, there is one of the following: i) A plurality of first grooves which are circumferentially arranged at intervals are arranged on the contact end surface of the annular shoulder; II) the butt end of the first pipe section is provided with a plurality of second grooves arranged at intervals circumferentially. The first groove/second groove has a concave configuration so as to reduce the contact surface between the contact end surface of the annular shoulder and the abutting end of the first pipe section, thereby reducing friction so that the second pipe section has less rotational resistance relative to the first pipe section.

The invention has the following beneficial effects:

(1) The pipe connection structure introduces a connection sleeve, through the engagement of the connection sleeve with the first pipe section and the second pipe section, respectively, the second pipe section is connected and held to the first pipe section by the connection sleeve while being relatively rotatable in the circumferential direction.

(2) Through the jogging between the first jogging lug and the second jogging lug, the ability of resisting external side pulling force between connecting sleeve and the first pipe section has been increased, has further strengthened the bulk strength of system.

(3) Through the structural design of the clamping convex blocks, the first bulges/the second bulges and the first grooves/the second grooves, the contact area is reduced, so that the friction force can be reduced, and the rotation resistance of the second pipe section relative to the first pipe section is smaller.

Drawings

Other features and advantages of the present invention will be better understood from the following detailed description of alternative embodiments taken in conjunction with the accompanying drawings, in which like reference characters identify the same or similar parts throughout, and in which:

FIG. 1 is a schematic view of an exemplary embodiment of a pipe connection;

FIG. 2 is an exploded schematic view of the pipe connection structure shown in FIG. 1;

FIG. 3 is a schematic view of the first tube of FIG. 2;

FIG. 4 is a schematic view of the second tube of FIG. 2;

FIG. 5 is another angular view of the second tube;

FIG. 6 is a schematic view of the coupling sleeve of FIG. 2;

FIG. 7 is a cross-sectional view of the tube connection structure of FIG. 1;

Fig. 8 is an enlarged schematic view of the region indicated by R in fig. 7.

Reference numerals: 100-a first pipe section; 100A-a butt end of the first pipe section; 110-an annular housing; 111-an annular receiving cavity; 112-clamping holes; 113-elastic snap ribs; 113A-a sloped section; 114-a second mating bump; 115-cavity bottom wall; 116-an annular groove; 200-a second pipe section; 210-clamping convex edges; 210A-snap-fit bumps; 220-sealing the cartridge housing; 221-a sealing ring; 222-an annular cavity; 223-a first bump; 223A-first bump; 230-an annular shoulder; 230A-contact end face of the annular shoulder; 231-a first groove; 300-connecting the sleeve; 310-annular ribs; 320-clamping hooks; 321-wedge-shaped hooks; 321A-an abutment surface; 321B-mounting ramp; 330-a first mating bump; a-a first pipe fitting; b-a second tube.

Detailed Description

The making and using of the embodiments are discussed in detail below. It should be understood, however, that the detailed description and specific examples, while indicating a particular manner of making and using the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The structural position of the various components as described, such as upper, lower, top, bottom, etc., is not absolute, but rather relative. These orientation expressions are appropriate when the various components are arranged as shown in the figures, but when the position of the various components in the figures is changed, these orientation expressions are also changed accordingly.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

In the present invention, the axial direction of the cylindrical or tubular member refers to a direction along the central axis of the member, the circumferential direction of the cylindrical or tubular member refers to a direction along the circumference of the member, and the radial direction of the cylindrical or tubular member refers to a direction passing through the central axis of the member and perpendicular to the axial direction of the member.

Fig. 1 and 2 illustrate an exemplary embodiment of a pipe connection structure according to the present invention, which includes a first pipe segment 100, a second pipe segment 200, and a connection sleeve 300, with the connection sleeve 300 as a connection member, on the one hand, holding the second pipe segment 200 on the first pipe segment 100 and on the other hand, enabling the first pipe segment 100 and the second pipe segment 200 to rotate relative to each other in the circumferential direction, thereby solving the problem that two butted pipes cannot rotate relative to the circumferential direction after being butted in the prior art.

As shown in fig. 1 and 2, the first pipe segment 100 belongs to a first pipe a and the second pipe segment 200 belongs to a second pipe B. The outer circumference of the first pipe section 100 is provided with a first connection portion, the outer circumference of the second pipe section 200 is provided with a second connection portion, the second pipe section 200 is axially butted to the first pipe section 100, and the axial direction of the first pipe section 100, the second pipe section 200 and the connection sleeve 300, i.e., the insertion direction or the butting direction, is indicated by an arrow V in fig. 1 and 2. The connecting sleeve 300 is provided with a third connecting part matched with the first connecting part and a fourth connecting part matched with the second connecting part. The engagement of the first and third connection portions, the engagement of the second and fourth connection portions, in turn, may retain the second pipe segment 200 to the first pipe segment 100 while the second pipe segment 200 is capable of circumferential rotation relative to the first pipe segment 100.

In some alternative embodiments, the second coupling portion is circumferentially rotatable relative to the fourth coupling portion such that the second pipe segment 200 is circumferentially rotatable relative to the coupling sleeve 300, and the fourth coupling portion may form a stop for the second coupling portion in a direction parallel to the axial direction to retain the second pipe segment 200 on the coupling sleeve 300. Alternatively, referring to fig. 7, the connection sleeve 300 is sleeved on the outer circumference of the second pipe section 200, the second connection part includes a clamping rib 210 disposed on the outer circumference of the second pipe section 200, the fourth connection part includes an annular rib 310 disposed on the inner sidewall of the connection sleeve 300 and adapted to the clamping rib 210, the annular rib 310 may form an axial blocking for the clamping rib 210, when the clamping rib 210 contacts the annular rib 310, the annular rib 310 gives the clamping rib 210a retaining force directed to the first pipe section 100, and at the same time, the annular rib 310 and the clamping rib 210 can rotate circumferentially relative to each other, so that by the mutual cooperation of the clamping rib 210 and the annular rib 310, the second pipe section 200 is retained on the connection sleeve 300 and the second pipe section 200 can rotate circumferentially relative to the connection sleeve 300 is realized. Advantageously, as shown in fig. 1 and 4, the clamping bead 210 may be a plurality of clamping projections 210A circumferentially spaced apart on the outer circumference of the second pipe section 200, and when the clamping projections 210A contact the annular rib 310, the annular rib 310 imparts a retaining force to the clamping projections 210A, so that friction may be reduced due to a smaller contact area between the clamping projections 210A and the annular rib 310, resulting in a smaller rotational resistance of the second pipe section 200 relative to the first pipe section 100. It should be appreciated that the snap bead 210 may be an annular flange (not shown) provided at the outer circumference of the second pipe segment 200, to which the annular rib 310 may impart a retaining force when in contact with the annular rib 310, regardless of reducing frictional resistance. In summary, when the snap-in rib 210 and the annular rib 310 are in contact, the fourth connection portion may impart a retaining force to the second connection portion directed by the second pipe segment 200 toward the first pipe segment 100 in a direction parallel to the axial direction, retaining the second pipe segment 200 on the connection sleeve 300. Optionally, in some embodiments, the snap-in ledges 210 contact the inner sidewall of the coupling sleeve 300, which may enable or enhance radial retention of the second tube segment 200 relative to the coupling sleeve 300.

It should be understood that the mutual positions and roles of the annular rib 310 and the snap bead 210 described above are interchangeable. That is, in other embodiments, the second connection portion includes an annular rib disposed at the outer circumference of the second pipe segment 200, and the fourth connection portion includes a snap bead disposed at the inner sidewall of the connection sleeve 300 and adapted to the annular rib, and the snap bead may apply a retaining force to the annular rib directed toward the first pipe segment 100 and be capable of rotating circumferentially with respect to the annular rib when the snap bead contacts the annular rib. This also enables the second pipe section 200 to be held on the coupling sleeve 300 and the second pipe section 200 to be able to rotate circumferentially relative to the coupling sleeve 300. In some embodiments, the clamping ribs may also be a plurality of clamping protrusions circumferentially spaced apart on the inner side wall of the connection sleeve 300 or an annular flange disposed on the inner side wall of the connection sleeve 300, and may contact the outer side wall of the second pipe section 200, to achieve or enhance radial limiting of the second pipe section 200 relative to the connection sleeve 300.

Referring to fig. 2,3 and 7, the first connection portion includes an annular housing 110, the annular housing 110 extending radially outwardly and parallel to the axial direction from the outer periphery of the first pipe segment 100 and forming an annular receiving cavity 111 with the outer side wall of the first pipe segment 100, and the connection sleeve 300 is insertable into the annular receiving cavity 111 to form a radial stop with the first pipe segment 100. Fig. 3 and 7 illustrate the structure of the annular housing 110, the annular housing 110 including a cavity bottom wall 115 extending radially outwardly from the outer periphery of the first pipe section 100 and a sidewall of the annular housing 110 extending axially from the outer periphery of the cavity bottom wall 115. After the connection sleeve 300 is inserted into the annular receiving cavity 111, the side wall of the annular housing 110 radially limits the connection sleeve 300 from the outer circumferential side of the connection sleeve 300, and the connection sleeve 300 and the first pipe segment 100 form a radial limit. Optionally, the first connection portion includes a plurality of fastening holes 112 circumferentially spaced apart on the annular housing 110 (e.g., on a sidewall of the annular housing 110), and the third connection portion includes a plurality of fastening hooks 320 circumferentially spaced apart on an outer sidewall of the connection sleeve 300. After the clamping hooks 320 are engaged into the clamping holes 112, the clamping holes 112 are clamped with the clamping hooks 320, the clamping holes 112 can limit the clamping hooks 320 axially (i.e., the axial direction of the first pipe section 100) and circumferentially (i.e., the circumferential direction of the circumference where the side wall of the annular housing 110 is located), for example, the clamping holes 112 clamp the clamping hooks 320 axially and circumferentially, and then the first pipe section 100 and the connecting sleeve 300 are limited axially and circumferentially. And further, the first pipe section 100 and the connecting sleeve 300 are fixedly connected in a clamping connection mode, so that the operation is simple and quick.

Referring to fig. 3, 6, 7 and 8, the elastic clamping rib 113 extending parallel to the axial direction of the first pipe section 100 is arranged in the clamping hole 112, and after the clamping hook 320 enters the clamping hole 112, the free end of the elastic clamping rib 113 pushes the clamping hook 320 into the clamping hole 112 to keep the clamping hook 320 in place, so that the clamping is formed, and the axial limit between the first pipe section 100 and the connecting sleeve 300 is realized. Meanwhile, in the circumferential direction, circumferential limitation between the first pipe segment 100 and the connection sleeve 300 is achieved due to mutual abutment of the side wall of the clamping hole 112 and the side wall of the clamping hook 320. During the insertion of the connection sleeve 300 into the annular receiving cavity 111 to mount the snap hooks 320 to the snap holes 112, the mounting is facilitated because the elastic snap ribs 113 are elastically deformable.

Referring to fig. 7 and 8, the free ends of the resilient snap ribs 113 are bent and extended at an angle towards the annular receiving cavity 111 to form an inclined section 113A, where the angle refers to a direction offset from the extension direction of the resilient snap ribs 113 (i.e. a direction parallel to the axial direction of the first pipe segment 100). Referring to fig. 6, 7 and 8, the snap hook 320 has a wedge-shaped hook portion 321 protruding radially outward, and the wedge-shaped hook portion 321 has an abutment surface 321A and a mounting inclined surface 321B connected to the abutment surface 321A. After the snap hook 320 is inserted into the annular housing 110, the free end of the inclined section 113A extending toward the annular receiving cavity 111 can abut against the abutment surface 321A of the snap hook 320, so as to push and clamp the snap hook 320 in the snap hole 112. The mounting ramp 321B may slide with the angled section 113A of the resilient snap rib 113. In addition, during the process of pushing the locking hooks 320 into the locking holes 112, the inclined surface of the mounting inclined surface 321B is attached to the inclined surface of the inclined section 113A and gradually pushes the elastic locking rib 113 to elastically deform outwards, so that the sliding guide is performed through the surface contact between the two.

In some embodiments, as in the exemplary embodiments shown in fig. 1, 3, 6 and 7, the outer sidewall of the connection sleeve 300 is circumferentially spaced with a plurality of first engagement projections 330, the inner sidewall of the annular housing 110 is circumferentially spaced with a plurality of second engagement projections 114, and the first engagement projections 330 and the second engagement projections 114 are engaged with each other in a spaced relationship to form an engagement or bite. This mating or biting arrangement enhances the ability of the coupling sleeve 300 and the annular housing 110 to resist external side pulling forces (stresses that may compromise the structural stability of the system, such as circumferential stresses that occur during circumferential rotation of the second pipe segment 200 relative to the first pipe segment 100, axial stresses that force the first pipe segment 100 to move away from the second pipe segment 200, etc.), further enhancing the overall strength of the system. It should also be appreciated that at least one first engagement protrusion 330 is inserted into the space between adjacent second engagement protrusions 114 and/or at least one second engagement protrusion 114 is inserted into the space between adjacent first engagement protrusions 330, which resists external lateral pulling forces, and that in fig. 1, both first engagement protrusions 330 and second engagement protrusions 114 are inserted into the space between each other, as a preferred embodiment.

As shown in fig. 1,2 and 7, the structure having the above-mentioned snap hooks 320, snap holes 112, first fitting projections 330 and second fitting projections 114 is shown at the same time, the inner side wall of the annular housing 110 is circumferentially provided with a plurality of second fitting projections 114 arranged at intervals, while at the same time, the side wall of the annular housing 110 is circumferentially arranged with a plurality of snap holes 112, and the outer side wall of the connecting sleeve 300 is circumferentially arranged with a plurality of snap hooks 320. As shown in fig. 2 and 7, the snap-fit hole 112 is located between the second fitting projection 114 and the cavity bottom wall 115 of the annular housing 110. In this way, during the process of inserting the clip hooks 320 into the annular receiving cavity 111 to be engaged with the clip holes 112, the circumferential area where the second engaging protrusions 114 are located will be passed first, so that the clip hooks 320 are smoothly inserted into the annular receiving cavity 111 and enter the clip holes 112 without being blocked by the second engaging protrusions 114 on the inner side wall of the annular housing 110, as shown in fig. 1 and 3, in the direction parallel to the axial direction of the first pipe section 100, the spacing between the adjacent second engaging protrusions 114 corresponds to the clip holes 112, while the spacing between the adjacent second engaging protrusions 114 allows the clip hooks 320 to pass through, as shown in fig. 2, so that, during installation, the clip hooks 320 pass through the spacing between the adjacent second engaging protrusions 114 and then enter the clip holes 112.

Referring to fig. 7, at the butt end of the second pipe section 200, i.e., the end of the second pipe section 200 to be connected to the first pipe section 100, the second pipe section 200 includes a sealing cartridge 220 extending parallel to the axial direction, the sealing cartridge 220 being insertable into the annular receiving chamber 111, an annular chamber 222 accommodating a sealing ring 221 being formed between the inner side wall of the sealing cartridge 220 and the outer side wall of the first pipe section 100 to form a seal between the first pipe section 100 and the second pipe section 200.

In some embodiments, the sealing cartridge 220 may contact the radially extending cavity bottom wall 115 of the annular receiving cavity 111, forming an axial stop therebetween, in which axial direction the second tube segment 200 moves toward the first tube segment 100, eventually being stopped by the cavity bottom wall 115, while the second tube segment 200 moves away from the first tube segment 100, eventually being stopped by the fourth connection (which may be, in particular, the annular rib 310), thereby retaining the second tube segment 200 to the first tube segment 100. In the embodiment shown in fig. 7, the sealing cartridge 220 can contact the cavity bottom wall 115 and at the same time the snap-in ledge 210 (i.e., snap-in tab 210A) can contact the annular rib 310 such that the second tube segment 200 is axially relatively fixed with respect to the first tube segment 100. It should be appreciated that in some embodiments, where tightness is ensured between the first pipe segment 100 and the second pipe segment 200, such as where the annular cavity 222 has sufficient axial dimension (i.e., a direction parallel to the axial direction of the first pipe segment 100) to ensure that even if the sealing cartridge housing 220 moves axially, the sealing ring 221 is always within the annular cavity 222, and the cavity bottom wall 115 and the fourth connection (which may specifically be the annular rib 310) do not simultaneously block axial movement of the second pipe segment 200, i.e., there may be some relative movement of the first pipe segment 100 and the second pipe segment 200 in the axial direction, the connection sleeve 300 always holds the second pipe segment 200 on the first pipe segment 100, without the second pipe segment 200 being disengaged from the first pipe segment 100.

Preferably, referring to fig. 7, the cavity bottom wall 115 is provided with an annular groove 116, and the sealing cartridge 220 is insertable into the annular groove 116, whereby the entire second tube segment 200 is further surrounded by the annular housing 110, enabling a better assurance of the seal. Further, it can be appreciated that the greater the axial dimension of the annular groove 116, the better the sealing effect.

In some embodiments, referring to fig. 4, the outer sidewall of the sealed cartridge housing 220 is provided with a first protrusion 223, the first protrusion 223 contacting the inner sidewall of the connecting sleeve 300. The configuration of the first projection 223 provides a smaller contact surface between the seal cartridge 220 and the coupling sleeve 300, and thus less friction, than a direct surface contact, and therefore less resistance to rotation of the second pipe segment 200 relative to the first pipe segment 100. Additionally, although not shown, it should be appreciated that in other embodiments, the inner sidewall of the connecting sleeve 300 is provided with a second protrusion (not shown) that contacts the outer sidewall of the sealing cartridge 220. Alternatively, referring to fig. 4 and 7, the first protrusion 223 may be configured as a first protrusion 223A, and the outer side wall of the sealing cylinder case 220 is provided with a plurality of first protrusions 223A, where the plurality of first protrusions 223A are arranged along the axial direction and/or the circumferential direction on the outer side wall of the sealing cylinder case 220, and the first protrusions 223A are distributed in a lattice-shaped manner on the outer side wall of the sealing cylinder case 220, and in the illustrated embodiment, the first protrusions 223A are arranged along the axial direction and the circumferential direction on the outer side wall of the sealing cylinder case 220, and the number of the first protrusions 223A along the axial direction and the circumferential direction is 3 and 4, respectively. It should be appreciated that in some embodiments, the number of first projections 223A in the axial and circumferential arrays may be provided as the case may be. In some other embodiments, the first projection 223 can also be a plurality of annular projections (not shown) axially spaced apart on the outer sidewall of the seal cartridge housing 220. In other embodiments, the second protrusions are configured as second protrusions (not shown), and the inner side wall of the connection sleeve 300 is provided with a plurality of second protrusions, where the plurality of second protrusions are arranged in the axial direction and/or the circumferential direction on the inner side wall of the connection sleeve 300, for example, the second protrusions are arranged in the axial direction and the circumferential direction on the inner side wall of the connection sleeve 300 in an array manner, and the number of the arrays in the axial direction and the circumferential direction is 3 and 4, respectively, and the number of the arrays in the axial direction and the circumferential direction of the second protrusions may be set according to practical situations. In other embodiments, the second protrusion may also be a plurality of annular protrusions (not shown) axially spaced apart on the inner sidewall of the connection sleeve 300. It should be appreciated that other suitable arrangements are possible that reduce the frictional force between the outer sidewall of the sealed cartridge housing 220 and the inner sidewall of the connector sleeve 300 by reducing the contact area therebetween.

In certain embodiments, as shown in fig. 7, the inner sidewall of the second pipe segment 200 is provided with an annular shoulder 230, the butted end 100A of the first pipe segment 100 is inserted into the second pipe segment 200 to effect the socket of the first pipe segment 100 with the second pipe segment 200, and the butted end 100A of the first pipe segment 100 is in contact with the contact end face 230A of the annular shoulder 230. Referring to fig. 7, upon contact of the abutment end 100A of the first tube segment 100 and the contact end surface 230A of the annular shoulder 230, an axial blocking is provided therebetween, in which axial direction the second tube segment 200 moves toward the first tube segment 100 and eventually is blocked by the abutment end 100A, while the second tube segment 200 moves away from the first tube segment 100 and eventually is blocked by the fourth connection (which may be, in particular, the annular rib 310). It should be appreciated that after the butt end 100A of the first pipe section 100 is inserted into the second pipe section 200, the first pipe section 100 and the second pipe section 200 may be relatively radially restrained, e.g., the outer diameter of the butt end 100A of the first pipe section 100 may be substantially equal to or slightly smaller than the inner diameter (of the butt end) of the second pipe section 200, thereby achieving the relative radial restraint of the first pipe section 100 and the second pipe section 200.

In some embodiments, the contact end surface 230A of the annular shoulder 230 is provided with a plurality of first grooves 231 circumferentially spaced apart, and referring to the example shown in fig. 5, the contact end surface 230A is provided with 4 first grooves 231 uniformly circumferentially spaced apart, so that the contact area between the abutting end 100A of the first pipe segment 100 and the contact end surface 230A of the annular shoulder 230 is smaller, and the friction force between the abutting end 100A and the contact end surface 230A of the annular shoulder 230 is reduced, and therefore the rotation resistance of the second pipe segment 200 relative to the first pipe segment 100 is smaller. It should be appreciated that in other embodiments, a plurality of second grooves circumferentially spaced apart on the abutting end 100A of the first pipe segment 100 may be used, which also results in a smaller contact area and friction between the abutting end 100A of the first pipe segment 100 and the contact end surface 230A of the annular shoulder 230, for the purpose of reducing the rotational resistance of the second pipe segment 200 relative to the first pipe segment 100. It should be appreciated that other suitable arrangements are possible that reduce the friction between the contact end face 230A of the annular shoulder 230 and the butt end 100A of the first pipe section 100 by reducing the contact area therebetween.

It should also be appreciated that the various components and features described herein may be made from a variety of materials including, but not limited to, polymers, rubbers, metals, and the like, as well as other suitable materials or combinations of materials known to those skilled in the art. Fig. 1 to 8 show embodiments only showing the shape, dimensions and arrangement of the various optional components of the pipe connection structure according to the invention, which are however only illustrative and not limiting, other shapes, dimensions and arrangements may be adopted without departing from the spirit and scope of the invention.

While the foregoing has disclosed the subject matter and the features of the invention, it will be appreciated that those skilled in the art, upon attaining the teachings of the invention, may make variations and improvements to the concepts disclosed herein, and fall within the scope of the invention. The above description of embodiments is illustrative and not restrictive, and the scope of the invention is defined by the claims.

Claims (14)

1. A pipe connection structure, characterized in that the pipe connection structure comprises:

a first pipe section (100), wherein a first connection part is arranged on the periphery of the first pipe section (100);

-a second tube section (200), the outer circumference of the second tube section (200) being provided with a second connection, the second tube section (200) being adapted to axially butt-connect to the first tube section (100);

-a connection sleeve (300), on which connection sleeve (300) a third connection part is provided, adapted to the first connection part, and a fourth connection part is provided, adapted to the second connection part, adapted to hold the second pipe section (200) in the first pipe section (100) and rotatable circumferentially with respect to the first pipe section (100).

2. The pipe connection according to claim 1, wherein the connection sleeve (300) is sleeved with the second pipe section (200), one of the second connection portion and the fourth connection portion comprises a clamping rib (210), the other of the second connection portion and the fourth connection portion comprises an annular rib (310) adapted to the clamping rib (210), and the connection sleeve (300) and the second pipe section (200) are capable of rotating circumferentially through the mutual cooperation of the clamping rib (210) and the annular rib (310).

3. The pipe connection according to claim 2, wherein the clamping ribs (210) are configured as a plurality of clamping projections (210A) arranged at intervals in the circumferential direction.

4. A pipe connection according to claim 1, characterized in that the first connection comprises an annular casing (110) extending radially outwards from the outer circumference of the first pipe section (100) and parallel to the axial direction, the annular casing (110) and the outer side wall of the first pipe section (100) forming an annular receiving cavity (111), the connection sleeve (300) being adapted to be inserted into the annular receiving cavity (111) forming a radial stop with the first pipe section (100).

5. The pipe connection structure according to claim 4, wherein the first connection portion includes a plurality of clamping holes (112) circumferentially spaced apart on the annular housing (110), the third connection portion includes a plurality of clamping hooks (320) circumferentially spaced apart on an outer sidewall of the connection sleeve (300), and the first pipe section (100) and the connection sleeve (300) are axially and circumferentially mutually limited by clamping the clamping holes (112) and the clamping hooks (320).

6. A pipe connection according to claim 5, characterized in that the clamping hole (112) is provided with a resilient clamping rib (113) extending parallel to the axial direction of the first pipe section (100), the resilient clamping rib (113) being adapted to hold the clamping hook (320) into the clamping hole (112) in place.

7. The pipe connection structure according to claim 6, characterized in that the free end of the elastic clamping rib (113) is bent and extended at an angle towards the annular receiving cavity (111) to form an inclined section (113A), the clamping hook (320) has a wedge-shaped hook portion (321) protruding radially outwards, the wedge-shaped hook portion (321) has an abutment surface (321A) and a mounting inclined surface (321B) connected with the abutment surface (321A), the abutment surface (321A) is adapted to abut against the free end of the elastic clamping rib (113), and the mounting inclined surface (321B) is adapted to slide with the inclined section (113A) of the elastic clamping rib (113).

8. The pipe connection structure according to claim 4, wherein the outer side wall of the connection sleeve (300) is provided with a plurality of first fitting projections (330) at intervals in the circumferential direction, and the inner side wall of the annular housing (110) is provided with a plurality of second fitting projections (114) at intervals in the circumferential direction; at least one of the first fitting projections (330) is adapted to be fitted into a space between adjacent second fitting projections (114), and/or at least one of the second fitting projections (114) is adapted to be fitted into a space between adjacent first fitting projections (330).

9. A pipe connection according to any one of claims 4 to 8, further comprising a sealing ring (221), the second pipe section (200) comprising a sealing cartridge (220) extending parallel to the axial direction, the sealing cartridge (220) being adapted to be inserted into the annular receiving cavity (111), an annular cavity (222) being formed between an inner side wall of the sealing cartridge (220) and an outer side wall of the first pipe section (100) adapted to accommodate the sealing ring (221).

10. A pipe connection according to claim 9, characterized by one of the following:

a) The outer side wall of the sealing cylinder shell (220) is provided with a first bulge (223), and the first bulge (223) is contacted with the inner side wall of the connecting sleeve (300);

b) The inner side wall of the connecting sleeve (300) is provided with a second bulge, and the second bulge is contacted with the outer side wall of the sealing cylinder shell (220).

11. A pipe connection according to claim 10, characterized in that the first projection (223) is configured as a first projection (223A), the outer side wall of the sealing cylinder housing (220) being provided with a plurality of the first projections (223A), the plurality of first projections (223A) being arranged axially and/or circumferentially at the outer side wall of the sealing cylinder housing (220).

12. A pipe connection according to claim 10, characterized in that the second protrusions are configured as second protrusions, the inner side wall of the connection sleeve (300) being provided with a plurality of the second protrusions, which are arranged axially and/or circumferentially at the inner side wall of the connection sleeve (300).

13. A pipe connection according to claim 1, characterized in that the inner side wall of the second pipe section (200) is provided with an annular shoulder (230), the first pipe section (100) is sleeved with the second pipe section (200), and the abutting end (100A) of the first pipe section (100) is in contact with the contact end surface (230A) of the annular shoulder (230).

14. A pipe connection according to claim 13, characterized by one of the following:

i) -said contact end face (230A) of said annular shoulder (230) is provided with a plurality of first grooves (231) arranged circumferentially spaced apart;

II) the butt end (100A) of the first pipe section (100) is provided with a plurality of second grooves which are circumferentially arranged at intervals.