Connecting structure serving as in-pipe embedded part

Abstract

The connecting structure of the embedded part in the pipe comprises a shaft-shaped connecting piece and an outer pipe arranged on the periphery of the shaft-shaped connecting piece in a sleeved mode, the shaft-shaped connecting piece is provided with a plurality of hole channels capable of being connected with fastening screws in a screwed mode, and the hole channels penetrate through the axis of the shaft-shaped connecting piece. The axial lead of the hole channel is perpendicular to or inclined to the axial lead of the shaft-shaped connecting piece, and a fastening screw arranged in at least one hole channel can extend into the hole channel from the first end of the hole channel and extend out of the second end of the hole channel to abut against the inner wall face of the outer pipe; the outer pipe is provided with a reamed hole, the reamed hole is right opposite to the first end or the second end of a hole channel formed in the shaft-shaped connecting piece, however, no reamed hole is formed in the position, right opposite to the fastening screw extending out of the second end of the hole channel, of the shaft-shaped connecting piece, and the hole channel, right opposite to the reamed hole, on the shaft-shaped connecting piece serves as a screwing station for connecting other workpieces. According to the utility model, the convenience, firmness, reliability and attractiveness of pipe fitting connection are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a connecting structure of pipe fittings, in particular to a connecting structure of a pre-embedded part in a pipe. BACKGROUND

[0002] In industrial products and daily necessities, axial connection or extension of pipe fittings with the same cross section or special-shaped pipe fittings with different cross section shapes is often involved, and typical examples include hanging clothes poles connected by two round pipes with the same outer diameter and wall thickness.

[0003] In order to firmly and reliably connect pipe fittings, it is best to adopt a welding method, however, welding conditions are not available in many environments, and the welds need to be polished after welding for the sake of appearance, which not only wastes energy and increases labor costs, but also the biggest problem is that it is inconvenient to disassemble after welding; and in view of the difference in cross section of special-shaped pipe fittings, direct welding is not only inconvenient but also unreliable.

[0004] At present, the searched Chinese patent "Pipe fitting welding connection structure" (publication number CN202129556U) is mainly used for welding between large-diameter pipe fittings in the shipbuilding industry, and belongs to the technical field of pipe welding, which comprises pipe fitting I (1) and pipe fitting II (2), the pipe fitting I (1) and the pipe fitting II (2) are fixedly connected through a plate (4), the connecting end of the pipe fitting I (1) and the pipe fitting II (2) is provided with a bevel (3), and the inner ring of the connecting part of the pipe fitting I (1) and the pipe fitting II (2) is provided with a ceramic gasket (5), the inner ring of the connecting part between the pipe fitting I and the pipe fitting II of the pipe fitting welding connection structure is provided with a ceramic gasket, single-sided welding can form a double-sided shape, effectively ensures the welding quality, reduces the requirements for bevel machining precision, gap uniformity and welder qualification, and can effectively prevent molten slag from entering the pipe during welding, thereby saving the subsequent work of cleaning the molten slag in the pipe; the patent realizes pipe fitting connection by welding, which is inconvenient for production and low in efficiency. SUMMARY

[0005] In view of the above problems, the purpose of the utility model is to provide a connecting structure of a pre-embedded part in a pipe, which is reasonable in design and convenient for production and use.

[0006] The utility model adopts the following scheme,

[0007] The utility model discloses a connecting structure of the in-pipe embedded part, which is characterized by comprising an axial connecting piece and an outer pipe sleeved on the periphery of the axial connecting piece.

[0008] Preferably, the axial connecting piece is a hollow rod body, a threaded hole is arranged on one side wall of the hollow rod body, a through hole for allowing the fastening screw to pass through is arranged on the wall opposite to the threaded hole, and the threaded hole and the through hole constitute the hole penetrating through the axial connecting piece.

[0009] Preferably, the axial connecting piece is a hollow rod body, the same threaded holes are arranged on the walls on both sides of the hollow rod body, and the two threaded holes on the walls on both sides are coaxial and constitute the hole penetrating through the axial connecting piece.

[0010] Preferably, the axial connecting piece is a solid rod body, a threaded hole or a threaded counterbore penetrating through the axial connecting piece is arranged on the solid rod body, and the threaded hole or the threaded counterbore constitutes the hole penetrating through the axial connecting piece.

[0011] Preferably, the axial connecting piece has the same cross section in the entire length direction, and the cross section is circular, square or elliptical.

[0012] Preferably, the axial connecting piece has two or more different cross sections or sizes in the entire length direction, and the cross section is circular, square or elliptical.

[0013] Preferably, the axial connecting piece is provided with a plurality of groups of holes in the circumferential direction.

[0014] Preferably, the axial connecting piece is provided with a plurality of groups of holes in the axial direction.

[0015] Preferably, a to-be-installed piece with a threaded through hole is arranged on the side of the outer pipe, a stud is threaded in the threaded through hole and the threaded hole, so as to fasten the to-be-installed piece and the outer pipe.

[0016] Preferably, an arc-shaped piece is arranged between the inner wall surface of the outer pipe and the outer peripheral surface of the axial connecting piece, the end of the fastening screw protruding from the second end of the hole abuts against the inner wall surface of the arc-shaped piece, and the outer peripheral surface of the arc-shaped piece is attached to the inner wall surface of the outer pipe.

[0017] The utility model discloses a simple structure, low cost, the shaft connecting piece of standardization manufacturing and its special use similar internal expansion mode concealed fixed installation method, greatly improved the convenience, firmness and aesthetic degree of pipe fitting connection, and realized the disadvantage that the pipe fitting of different section needs to be connected through flange plate which can not be realized by any one of previous connection mode. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model is further illustrated below in connection with the drawings.

[0019] Figure 1 It is the sectional view of one embodiment of the shaft connecting piece.

[0020] Figure 2 It is the left view of one embodiment of the shaft connecting piece.

[0021] Figure 3 It is the sectional view of another embodiment of the shaft connecting piece.

[0022] Figure 4 It is the sectional view of another embodiment of the shaft connecting piece.

[0023] Figure 5 It is the sectional view of another embodiment of the shaft connecting piece.

[0024] Figure 6 It is the sectional view of another embodiment of the shaft connecting piece.

[0025] Figure 7 It is the left view of one embodiment of the shaft connecting piece.

[0026] Figure 8 It is the sectional view of another embodiment of the shaft connecting piece.

[0027] Figure 9 It is the sectional view of one embodiment of the shaft connecting piece.

[0028] Figure 10 It is the sectional view of the first application embodiment of the shaft connecting piece.

[0029] Figure 11 It is the sectional view of the first application embodiment of the shaft connecting piece adding arc piece and sealing ring.

[0030] Figure 12 It is the sectional view of the shaft connecting piece. Figure 11

[0031] Figure 13 It is the sectional view of the second application embodiment of the shaft connecting piece.

[0032] Figure 14 It is the sectional view of the shaft connecting piece. Figure 13

[0033] ​​Figure 15 is a cross-sectional view of the first application embodiment of the shaft-shaped connector applied to different cross-section outer pipes;

[0034] Figure 16 is a cross-sectional view of the first application embodiment of the shaft-shaped connector applied to different cross-section outer pipes; Figure 15 is a cross-sectional view of the first application embodiment of the shaft-shaped connector applied to different cross-section outer pipes;

[0035] Figure 17 is a cross-sectional view of the second application embodiment of the shaft-shaped connector applied to different cross-section outer pipes;

[0036] Figure 18 is a cross-sectional view of the second application embodiment of the shaft-shaped connector applied to different cross-section outer pipes; Figure 17 is a cross-sectional view of the second application embodiment of the shaft-shaped connector applied to different cross-section outer pipes;

[0037] Figure 19 is a cross-sectional view of the third application embodiment of the shaft-shaped connector applied to different cross-section outer pipes;

[0038] Figure 20 is a cross-sectional view of the fourth application embodiment of the shaft-shaped connector applied to different cross-section outer pipes (for the case of inclined setting of the handrail connecting hole axis and the shaft-shaped connector axis);

[0039] Figure 21 is a cross-sectional view of the fourth application embodiment of the shaft-shaped connector applied to different cross-section outer pipes (for the case of perpendicular setting of the handrail connecting hole axis and the shaft-shaped connector axis);

[0040] Figure 22 is a cross-sectional view of the fifth application embodiment of the shaft-shaped connector applied to different cross-section outer pipes;

[0041] Figure 23 is a cross-sectional view of the sixth application embodiment of the shaft-shaped connector applied to different cross-section outer pipes (for the case of circular cross-section outer pipes);

[0042] Figure 24 is a cross-sectional view of the sixth application embodiment of the shaft-shaped connector applied to different cross-section outer pipes (for the case of rectangular cross-section outer pipes);

[0043] Figure 25 is a cross-sectional view of the sixth application embodiment of the shaft-shaped connector applied to different cross-section outer pipes (for the case of multiple holes in the circumference);

[0044] Figure 26 is a cross-sectional view of the sixth application embodiment of the shaft-shaped connector applied to different cross-section outer pipes (for the case of connection with the to-be-installed member);

[0045] Figure 27 is a cross-sectional view of the sixth application embodiment of the shaft-shaped connector applied to different cross-section outer pipes (for the case of multiple holes in the circumference);

[0046] Figure 28 is a cross-sectional view of the sixth application embodiment of the shaft-shaped connector applied to different cross-section outer pipes (for the case of multiple holes in the circumference and the axial direction);

[0047] Figure 29 is a cross-sectional view of the sixth application embodiment of the shaft-shaped connector applied to different cross-section outer pipes (for the case of multiple holes in the circumference and the axial direction); Figure 28Figure 3 is a perspective view of the shaft-shaped connector application embodiment (multiple holes in the circumferential and axial directions);

[0048] Figure 30 Figure 4 is a cross-sectional view of the seventh application embodiment of the shaft-shaped connector (for a circular pipe being connected);

[0049] Figure 31 Figure 5 is a cross-sectional view of the seventh application embodiment of the shaft-shaped connector (for a square pipe being connected);

[0050] Figure 32 Figure 6 is a cross-sectional view of Figure 31 ;

[0051] Figure 33 Figure 7 is a cross-sectional view of an application scenario of the sixth application embodiment of the shaft-shaped connector. DETAILED DESCRIPTION

[0052] The utility model will be further described in conjunction with the drawings and specific embodiments.

[0053] A hidden connector structure includes a shaft-shaped connector 1 and at least one hole 2 capable of screwing a fastening screw 3 (the hole can be threaded throughout the length or only partially threaded), a set of, two sets, three sets or multiple sets of holes are arranged in the circumferential direction of the shaft-shaped connector, and / or a set of, two sets, three sets or multiple sets of holes are arranged in the axial direction of the shaft-shaped connector; that is, a set of, two sets, three sets or multiple sets of holes are arranged in the circumferential direction of the shaft-shaped connector (as shown by 4, 5, etc.), and a set of, two sets, three sets or multiple sets of holes are arranged in the axial direction of the shaft-shaped connector (as shown by 10, 11, 28, 29, etc.). Figure 9 、 23 、 Figure 3 、 5 、

[0054] The axial center line of the hole and the axial center line of the shaft-shaped connector can be arranged perpendicular to each other (as shown by 4, 5, etc.) or can be arranged obliquely (that is, the axial center line of the hole and the axial center line of the shaft-shaped connector can form an angle of 60-90 degrees), and the axial center line of the hole and the axial center line of the shaft-shaped connector can intersect or not intersect. Figure 1 、 3 、

[0055] The axial connecting member has the same cross section along the whole length direction, and the cross section is circular, square, elliptical or other shapes. Or the axial connecting member has two or more different cross sections or sizes along the whole length direction (in order to match the shape and size of different external cross section), and the cross section is circular, square, elliptical or other shapes, that is, the length is stepped with variable cross section.

[0056] The hole can enable the fastening screw 3 threaded with it to extend from the first end 201 of the hole 2 and to extend from the second end 202 of the hole (that is, the fastening screw can extend from the second end 202 of the hole after being screwed into the hole), that is, the hole can be threaded along the whole length (such as Figure 8 , or the local section is threaded (such as Figure 1 , 3 , 4 and the like).

[0057] The fastening screw 3 is a commercially available part, which has a thread on the outer periphery and a hexagonal socket or a through hole on the end face, and the screwing depth of the fastening screw 3 and the hole 2 and the length of the fastening screw extending from the second end 202 of the hole can be adjusted by means of a hexagonal wrench.

[0058] A specific embodiment (such as Figure 1 , 2 , 3), for the hollow rod body of the axial connecting member 1 (that is, the pipe body with a certain wall thickness), a threaded hole 101 is arranged on one side wall of the hollow rod body, and a through hole 102 capable of allowing the fastening screw to pass through is arranged on the wall opposite to the threaded hole (that is, the through hole 102 can be slightly larger than the diameter of the fastening screw), and the threaded hole and the through hole constitute the hole passing through the axial connecting member. In the processing, the threaded hole 101 and the through hole 102 can be processed in different processing procedures or by different tools in the same processing procedure.

[0059] A specific embodiment (a preferred embodiment, such as Figure 4 , 5 ), for the hollow rod body of the axial connecting member 1 (that is, the pipe body with a certain wall thickness), the same threaded hole 101 is arranged on the wall of the hollow rod body on both sides, and the two threaded holes on the walls on both sides are coaxial and constitute the hole passing through the axial connecting member, that is, in the processing, the threaded holes on the walls on both sides can be completed in one processing procedure.

[0060] For the hollow rod body, a central threaded hole 105 can be arranged in the central hole to increase a connection position (such as Figure 28 ).

[0061] A specific embodiment, for the solid rod body of the axial connecting member (such as Figure 6 , 7As shown in Figure 8, a threaded hole or countersunk hole 103 for a through shaft-shaped connector is provided on the solid rod body, and the threaded hole or countersunk hole constitutes the channel of the through shaft-shaped connector.

[0062] The following describes several application examples of the above-mentioned shaft-shaped connectors:

[0063] The first application embodiment (such as) Figure 10 As shown, this is an axial extension connection of two pipe fittings. The shaft-shaped connector 1 has holes 2 at both ends, and fastening screws 3 are threaded into both holes. External connecting pipes 4 are respectively fitted onto both ends of the shaft-shaped connector (the cross-sectional shape and size of the two external connecting pipes 4 can be the same or different; the cross-section of the external connecting pipe 4 can be circular, square, elliptical, etc., for example...). Figure 15 , 16 As shown in Figures 17 and 18, the cross-sections and dimensions of the corresponding shaft connectors 1 at both ends can be matched with those of the outer tube. The outer tube 4 and the shaft connectors 1 can be a transition fit or a clearance fit. The outer tube is provided with an enlarged hole at the position opposite to the first end of the channel so that an internal hex wrench can be inserted. The fastening screws 3 in the two channels both extend from the second end 202 of the channel and abut against the inner wall of the outer tube 4.

[0064] The two outer pipes 4 are fastened to the shaft-shaped connector 1 by the fastening screws 3 in the two holes pressing against the inner wall of the outer pipe 4. The cross-sections of the two outer pipes 4 can be planes or other shapes that can fit together.

[0065] like Figure 11 , 12 As shown, to prevent the thin-walled outer pipe 4 from deforming due to the pushing force of the end of the fastening screw 3, an arc-shaped piece 5 is provided between the inner wall surface of the outer pipe and the outer peripheral surface of the shaft-shaped connector (the arc-shaped piece 5 can be a metal piece or a plastic piece, and the shape of the arc-shaped piece 5 can match the inner wall surface of the outer pipe; the arc-shaped piece 5 can be a three-quarter, one-third, or one-half annular piece). The end of the fastening screw extending from the second end of the channel abuts against the inner wall surface of the arc-shaped piece, and the outer peripheral surface of the arc-shaped piece is in contact with the inner wall surface of the outer pipe. Due to the setting of the arc-shaped piece 5, the force-bearing area of ​​the inner wall surface of the outer pipe is greatly increased, avoiding deformation of the outer pipe 4 due to localized force.

[0066] Furthermore, a sealing ring 6 can be provided between the outer peripheral surface of the arc-shaped piece and the inner wall surface of the outer pipe (to adapt to situations requiring watertightness or airtightness). The sealing ring 6 can be made of materials such as rubber, and of course, the sealing ring 6 has holes for avoiding passageways.

[0067] The second application example (such as) Figure 13 , 14The second application embodiment is different from the first application embodiment in that one of the two outer pipes has a smaller diameter, and one outer pipe is sleeved on the outer periphery of the shaft-shaped connector 1 (the inner wall surface of the outer pipe 4 is abutted by the fastening screw 3 in the hole), and one outer pipe is inserted into the central hole of the shaft-shaped connector 1 (the outer wall surface of the outer pipe 4 is abutted by the fastening screw 3 in the other hole).

[0068] The third application embodiment (as shown in Figure 19 ), in which the two outer pipes 4 sleeved on the two ends of the shaft-shaped connector are arranged at intervals, and an intermediate threaded hole 104 is arranged between the two outer pipes on the shaft-shaped connector (the intermediate threaded hole 104 can be one or several, and one more connection channel is added for each additional hole), and a stud 7 is inserted into the intermediate threaded hole, and the stud 7 passes through the through hole 801 on the second outer pipe 8 above the shaft-shaped connector. Through this structure, the axial connection of the two outer pipes and the connection with the second outer pipe 8 can be achieved.

[0069] The fourth application embodiment (as shown in Figure 20 , 21 ), in which the shaft-shaped connector is applied to the handrail of a staircase. The shaft-shaped connector 1 is installed in the inner hole of the tubular handrail 9, and the fastening screw 3 in the hole of the shaft-shaped connector 1 abuts against the inner wall surface of the handrail 9. An expansion hole corresponding to the hole is arranged on one side of the handrail 9 to facilitate the rotation of the fastening screw 3 by the inner hexagonal wrench passing through the expansion hole and extending into the hole. In order to ensure reliable fastening, two holes are arranged on the shaft-shaped connector 1, and fastening screws 3 are arranged in the two holes to abut against the handrail 9.

[0070] A connecting hole 10 for the upper end of the threaded head screw 11 is arranged on the handrail and the shaft-shaped connector (the axis of the connecting hole 10 can be perpendicular or inclined to the axis of the handrail, such as Figure 20 for inclined arrangement - for completely concealed form, Figure 21 for vertical arrangement - for partially exposed form), a vertical pipe 12 is arranged on the stair, a second shaft-shaped connector is arranged in the upper end of the vertical pipe 12, two holes are arranged on the second shaft-shaped connector, and fastening screws 3 are connected in the two holes, one of which abuts against the inner wall surface of the vertical pipe 12, and the other abuts against the outer periphery of the lower end of the threaded head screw 11.

[0071] The fifth application embodiment (as shown in Figure 22As shown in the figure, this embodiment uses a shaft-shaped connector for the interlocking connection of multiple pipes. A shaft-shaped connector 1 is installed in the inner hole of a central pipe 13. The fastening screws 3 in the two channels of the shaft-shaped connector 1 abut against the inner wall of the central pipe 13. At the same time, the central pipe 13 and the shaft-shaped connector 1 are provided with a number of connection holes 10 for threaded connection of one end of the stud head screw 11. A number of side pipes 14 are provided on the outer periphery of the central pipe 13. A second shaft-shaped connector is provided in the body of the end of the side pipe 14. The second shaft-shaped connector is provided with two channels. Fastening screws 3 are connected in the two channels. One fastening screw 3 is placed against the inner wall of the side pipe 14, and the other fastening screw 3 is placed against the outer periphery of the other end of the stud head screw 11. In this embodiment, the side pipe 14 and the central pipe 13 can be connected vertically or at an angle.

[0072] In this embodiment, the connection of tees and even multi-axial pipes can be easily achieved by combining the connectors, that is, a three-dimensional five-way connection can be achieved as shown in the figure.

[0073] In the sixth application embodiment, an outer tube 15 is fitted around the aforementioned shaft-shaped connector 1 (the cross-section of the outer tube 15 can be circular, square, or elliptical, etc.; the outer tube can be a pipe or profile, etc.; the outer contour shape of the shaft-shaped connector 1 and the inner surface shape of the outer tube 15 can be identical or not completely the same, as long as at least partially fitted, to ensure that it will not move inside the outer tube). The outer tube has several enlarged holes 16 (the diameter of the enlarged holes is slightly larger than the diameter of the channel 2). The enlarged holes 16 are directly opposite the first or second end of the channel 2 on the shaft-shaped connector, but no enlarged hole is provided at the position of the fastening screw extending from the second end of the channel, i.e., as shown... Figure 23-25 As shown, the cross-section of the shaft connector 1 has two channels, corresponding to three enlarged holes (such as...). Figure 23 , 24 As shown, the threads of the three enlarged holes can be used to connect with other workpieces, or the shaft connector 1 has four channels on its cross-section, corresponding to five enlarged holes (such as...). Figure 25 As shown, the threads of the five enlarged holes can be used to connect with other workpieces.

[0074] To increase the number of connectable workstations, a central threaded channel 105 is provided in the central hole of the hollow shaft-shaped connector 1 (i.e., tubular), through which bolts can be connected, such as... Figure 27-29 As shown, Figure 27 Five threaded connection stations are provided, such as Figure 29 It provides seven threaded connection stations, thereby expanding the installation station.

[0075] Specific application structure as follows Figure 26As shown, the outer tube 15 is provided with a to-be-mounted member 17 (which can be a plate or a tube) having a threaded through hole 18, and a threaded stud 19 is threaded in the threaded through hole 18 and the threaded hole (i.e. the hole 2) to fasten the to-be-mounted member 17 to the outer tube 15, wherein a partial section of the threaded hole is used to screw a fastening screw 3, and a partial section of the threaded hole is used to screw the threaded stud 19.

[0076] In this application embodiment, the perpendicular connection of two pipe members (the outer tube 15 and the through rod 27) can also be applied (as shown), and the outer periphery of the above-mentioned shaft-shaped connecting member 1 is provided with an outer tube 15 (the cross section of the outer tube 15 can be circular, square or elliptical, etc., and the outer tube can be a pipe or a profile, etc., and the outer contour shape of the shaft-shaped connecting member 1 and the inner surface shape of the outer tube 15 can be matched or not completely the same, only to ensure that at least partial fitting is ensured so as not to move in the outer tube), and the outer tube 15 and the shaft-shaped connecting member 1 are provided with a through rod 27 in the vertical direction, the first fastening screw 3 in the hole 2 is tightly pressed against the inner surface of the outer tube 15, the second fastening screw 3 in the hole 2 is tightly pressed against the outer surface of the through rod 27, and the two fastening screws 3 in the hole 2 are coaxial (as shown). Figure 33 Figure 33

[0077] As shown in the seventh application embodiment (as shown), one end of the above-mentioned shaft-shaped connecting member 1 is open and the other end is closed (the shaft-shaped connecting member 1 of this embodiment is a pipe with one end closed and one end open), and a screw 20 is threaded through the closed end from the inside of the shaft-shaped connecting member 1 to the outside of the closed end, the shaft-shaped connecting member 1 is installed at the end of a to-be-connected pipe 21 (the shaft-shaped connecting member 1 and the to-be-connected pipe 21 are coaxially arranged, and of course the to-be-connected pipe 21 can also be a profile, a plate, etc. which can coaxially install the shaft-shaped connecting member 1), and an outwardly expanded hole 22 is provided on the to-be-connected pipe 21 to be opposite to the hole 2 so as to facilitate the fastening screw 3 to be threaded into the hole 2 (the fastening screw 3 is threaded through the outwardly expanded hole 22, screwed into the hole 2 and tightly pressed against the inner wall surface of the to-be-connected pipe 21), and a connected pipe 23 is provided beside the to-be-connected pipe 21 (the connected pipe 23 has a through hole for the screw 20 to pass through, and the through hole is close to the end of the connected pipe 23, and of course the connected pipe 23 can also be a profile, a plate, etc. which can install the nut 24), and the connected pipe (close to the end position) is provided with a nut 24 which is connected and fastened with the screw 20. Figure 30-32 When the connected pipe 23 is a circular pipe, the end of the to-be-connected pipe 21 is an arc which is attached to the connected pipe 23, and when the connected pipe 23 is a square pipe, the end of the to-be-connected pipe 21 is a plane which is attached to the connected pipe 23.

[0078]

[0079] In order to improve the firmness of the connection (as shown), the to-be-connected pipe 21 is provided with a plurality of outwardly expanded holes 22 which are arranged at intervals along the axial direction of the to-be-connected pipe 21, and the fastening screw 3 is threaded through the outwardly expanded holes 22 and screwed into the hole 2. Figure 31 ​​​As shown in the figure), the relative position of the connecting pipe and the pipe to be connected at the contact surface is provided with a non-circular groove 25, and a gasket 26 matched with the shape of the non-circular groove is arranged in the non-circular groove 25, so that the non-circular groove 25 and the gasket 26 can avoid the slipping rotation of the screw 20.

[0080] Similarly, in order to avoid the outer pipe (including the outer connecting pipe, the outer pipe and the pipe for sleeving the shaft-shaped connecting piece 1) being deformed by the tightening screw 3, the arc-shaped piece 5 and / or the sealing ring 6 can be arranged in each of the above embodiments.

[0081] The shaft-shaped connecting piece 1 and the special installation method of the shaft-shaped connecting piece 1 are simple in structure, low in cost and standardized in manufacturing, greatly improve the convenience, firmness, reliability and aesthetics of pipe connection, and achieve the connection of pipes with different cross sections which cannot be achieved by any previous connection method and can only be connected through flanges. Especially through the simple combination of multiple connecting pieces, the communication of multidirectional pipes is achieved. The repeated disassembly and assembly of the connecting piece provide unlimited convenience for the assembly, packaging, transportation, installation, use and recycling of products, and is an environmentally friendly and resource-saving excellent solution.

[0082] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit them; although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the utility model can be modified or some technical features can be replaced equivalently; without departing from the spirit of the technical solutions of the utility model, they should be covered in the technical solution range of the utility model claimed.

Claims

1. A connection structure used as an embedded part in a pipe, characterized in that: The shaft-shaped connector and the outer tube are provided with a plurality of holes capable of screwing fastening screws, the holes penetrate the shaft center line of the shaft-shaped connector, that is, the shaft center line of the holes is perpendicular to or inclined to the shaft center line of the shaft-shaped connector, at least one fastening screw provided in the hole can extend into the hole from the first end and extend out of the hole from the second end to tightly press the inner wall surface of the outer tube; the outer tube is provided with a counterbore, the counterbore is opposite to the first end or the second end of the hole provided on the shaft-shaped connector, but the position opposite to the fastening screw extending out of the second end of the hole is not provided with a counterbore, the hole of the shaft-shaped connector opposite to the counterbore is used as a screwing position for connecting other workpieces.

2. The connecting structure according to claim 1, wherein: The shaft-shaped connector is a hollow rod body, a threaded hole is arranged on one side wall of the hollow rod body, a through hole capable of allowing the fastening screw to pass through is arranged on the wall opposite to the threaded hole, and the threaded hole and the through hole constitute the hole penetrating the shaft-shaped connector.

3. The connecting structure according to claim 1, wherein: The shaft-shaped connector is a hollow rod body, the same threaded holes are arranged on the walls on both sides of the hollow rod body, the two threaded holes on the walls on both sides are coaxial and constitute the hole penetrating the shaft-shaped connector.

4. The connecting structure according to claim 1, wherein: The shaft-shaped connector is a solid rod body, a threaded hole or a threaded counterbore penetrating the shaft-shaped connector is arranged on the solid rod body, and the threaded hole or the threaded counterbore constitutes the hole penetrating the shaft-shaped connector.

5. The connecting structure according to claim 1, 2, 3 or 4 as a pipe embedded member, characterized by: The cross sections of the shaft-shaped connector in the entire length direction are the same, and the cross sections are circular, square or elliptical.

6. The connecting structure according to claim 1, 2, 3 or 4 as a pipe embedded member, characterized by: The shaft-shaped connector has two or more different cross sections or sizes in the entire length direction, and the cross sections are circular, square or elliptical.

7. The connecting structure according to claim 1, 2, 3 or 4 as a pipe embedded member, characterized by: The shaft-shaped connector is provided with a plurality of groups of holes in the circumferential direction; and / or the shaft-shaped connector is provided with a plurality of groups of holes in the axial direction.

8. The connecting structure according to claim 1, 2, 3 or 4 as a pipe embedded member, characterized by: A central threaded hole is arranged in the central hole of the shaft-shaped connector.

9. The connecting structure according to claim 1, 2, 3 or 4 as a pipe embedded member, characterized by: A mounting piece provided with a threaded through hole is arranged beside the outer tube, a stud is threaded in the threaded through hole and the threaded hole, so as to fasten the mounting piece and the outer tube.

10. The connecting structure according to claim 1, 2, 3 or 4 as a pipe embedded member, characterized by: An arc-shaped piece is arranged between the inner wall surface of the outer tube and the outer peripheral surface of the shaft-shaped connector, the end of the fastening screw extending out of the second end of the hole abuts against the inner wall surface of the arc-shaped piece, and the outer peripheral surface of the arc-shaped piece is attached to the inner wall surface of the outer tube.

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