A pipe connecting structure and a fan assembly

Abstract

The application provides a pipeline connecting structure, which comprises an output pipe, a connecting ring horizontally arranged on the outer wall of the top end of the output pipe, a limiting ring vertically arranged on the outer top of the connecting ring, and a first positioning hole horizontally penetrating through the limiting ring; a connecting head comprising a connecting part and a transition part communicated with the top of the connecting part, the cross section of the connecting part being rectangular for matching the output pipe, a matching ring horizontally arranged on the outer wall of the bottom of the connecting part, a sticking ring vertically arranged on the outer top of the matching ring, the matching ring being stuck on the top of the connecting ring, the sticking ring being stuck on the inner wall of the limiting ring, and a second positioning hole arranged on the sticking ring for matching the first positioning hole; a plurality of connecting columns arranged on the connecting plate, each connecting column penetrating through a first positioning hole and a second positioning hole, four connecting plates arranged on the outer wall of the four limiting rings, and a positioning mechanism for fixing the position of the connecting plate. The pipeline connecting structure can improve the assembling efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of pipeline connection structure, and relates to a pipeline connection structure and a fan assembly. Background Technology

[0002] Pipeline connection, as the name suggests, is to connect or link two pipelines together. It is used in many fields, such as liquid transportation and gas transportation. When a fan (such as a centrifugal fan) is working, the impeller rotates under the drive of the motor. At the same time, external gas flows into the fan casing through the gas inlet and then is discharged outward through the gas outlet of the fan casing's output pipe.

[0003] To ensure better gas flow from the blower, its gas outlet is typically rectangular or elliptical. However, the subsequent gas supply pipe is usually circular. Therefore, an adapter is needed in practical applications. One end of the adapter connects to the outlet pipe, and its shape is compatible with the outlet pipe (e.g., rectangular or elliptical). The other end is circular and matches the end of the gas input pipe. Furthermore, the adapter is connected to the outlet pipe via a flange and multiple bolts. This requires manually manipulating each bolt during on-site assembly, resulting in low assembly efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a pipeline connection structure and a fan assembly, which aims to solve the problem of low assembly efficiency.

[0005] To solve the above-mentioned technical problems, the present invention provides a pipeline connection structure, comprising:

[0006] An output tube with a rectangular cross-section has a connecting ring horizontally arranged on the outer wall of its top end, a limit ring vertically arranged on the top outer side of the connecting ring, and a first positioning hole horizontally penetrating the limit ring.

[0007] The connector includes a connecting part and a transition part communicating with the top of the connecting part. The cross-section of the connecting part is a rectangle that matches the output tube. A mating ring is horizontally provided on the bottom outer wall of the connecting part. A fitting ring is vertically provided on the top of the outer side of the mating ring. The mating ring fits against the top of the connecting ring. The fitting ring fits against the inner wall of the limiting ring. A second positioning hole is provided on the fitting ring that matches the first positioning hole.

[0008] A connecting plate is provided with a plurality of connecting posts, each connecting post passing through a first positioning hole and a second positioning hole. There are four connecting plates, and the four connecting plates are attached to the outer wall of the four limiting rings.

[0009] A positioning mechanism is provided to fix the position of the connecting plate.

[0010] The present invention is further configured such that the positioning mechanism includes a positioning member, the lower side of which is provided with a plurality of clearance grooves, each clearance groove having a connecting post, the side of which is provided with a vertically extending engagement groove, the side of which is close to the connecting part being an engagement chamfer, the engagement chamfer being inclined, and the minimum distance between the bottom of the engagement chamfer and the connecting part being less than the minimum distance between the top of the engagement chamfer and the connecting part being less than the minimum distance between the top of the engagement chamfer and the connecting part being less than the minimum distance between the bottom of the engagement chamfer and the connecting part being less than the minimum distance between the top of the engagement chamfer and the connecting part being less than the minimum distance between the clearance groove and the connecting protrusion being provided, the clearance groove having an engagement protrusion that can pass through the engagement groove, one side of which is attached to the engagement chamfer.

[0011] An elastic layer that is constantly under compression is provided between the connecting plate and the limiting ring.

[0012] The present invention is further configured such that the elastic layer is fixedly connected to the connecting plate.

[0013] The present invention is further configured such that each of the connecting posts has two engaging grooves, the two engaging grooves are symmetrically distributed on both sides of the connecting post, and the side of the engaging protrusion is connected to the inner wall of the accommodating groove.

[0014] The present invention is further configured such that the inner side of the positioning member is attached to the outer wall of the connecting part, and the outer side is attached to the inner wall of the fitting ring.

[0015] The present invention is further configured such that the top of the positioning member is provided with a linkage member with an L-shaped longitudinal section, the top of the inner wall of the linkage member is attached to the fitting ring and the limiting ring, the inner wall of the vertical part is attached to the outer wall of the limiting ring, and the bottom of the linkage member is provided with a driving part with an arc-shaped longitudinal section, the opening of the driving part is facing away from the connecting part, and the projections of the middle, top and bottom of the driving part in the vertical direction are arranged sequentially.

[0016] When the middle part of the driving part is attached to the top of the outer side of the connecting plate, the engaging protrusion is higher than the engaging groove, and the free end of the connecting post abuts against the outer wall of the connecting part. The projection of the engaging oblique side in the vertical direction is misaligned with the projection of the engaging protrusion in the vertical direction.

[0017] The present invention is further configured such that the positioning member is L-shaped, the combined shape of the two positioning members matches the shape of the connecting part, the mating ring and the fitting ring, and the linkage member is provided on both sides of the positioning member;

[0018] A connecting body is vertically arranged on one end of the positioning member near the side of the other positioning member. An anti-detachment post is vertically arranged on the free end of the connecting body. The diameter of the anti-detachment post is greater than the width of the connecting body. The top and bottom of the connecting body and the anti-detachment post are at the same height as the top and bottom of the positioning member, respectively. An anti-detachment groove is provided at the other end of the positioning member to cooperate with the connecting body and the anti-detachment post.

[0019] The present invention is further configured such that the two positioning components are a first component and a second component, wherein the bottom of the connecting body on the first component is vertically provided with a termination groove, the anti-detachment groove on the second component is provided with a termination protrusion that cooperates with the termination groove, and the top of the anti-detachment column on the second component is provided with a guide column, the guide column is coaxial with the anti-detachment column and has the same diameter, and the top of the guide column is chamfered or rounded.

[0020] The present invention is further configured such that there is a set distance between the top of the linkage and the outer wall of the connecting part, and an operating ramp is inclinedly provided on the side of the top of the linkage near the connecting part, and the longitudinal section of the operating ramp is an arc shape with the opening facing the outer wall of the connecting part.

[0021] The present invention also provides a fan assembly, including a fan housing and a pipeline connection structure as described in any of the preceding claims, wherein the output pipe is connected to the fan housing.

[0022] Compared with the prior art, the present invention provides a pipeline connection structure. When connecting the connecting part to the output pipe, the connecting part is first placed on the top of the output pipe. At this time, the mating ring is attached to the top of the connecting ring, the fitting ring is attached to the inner wall of the limiting ring, and all the second positioning holes correspond to the corresponding first positioning holes. Then, after moving the four connecting plates to the appropriate positions, all the connecting posts are passed through the first positioning holes and the second positioning holes. Finally, the positioning mechanism is used to fix the position of the four connecting plates. In the entire operation, only the position of the four connecting plates needs to be fixed, thus making the operation and assembly more efficient. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of a fan assembly according to the present invention;

[0024] Figure 2 yes Figure 1 Enlarged view of section A;

[0025] Figure 3 yes Figure 1 Enlarged view of section B;

[0026] Figure 4 This is a cross-sectional view of an embodiment of a fan assembly according to the present invention;

[0027] Figure 5 yes Figure 4 Enlarged view of section C;

[0028] Figure 6 This is a cross-sectional view of an embodiment of the connecting column portion in a wind turbine assembly according to the present invention during assembly;

[0029] Figure 7 yes Figure 6 Enlarged view of section D;

[0030] Figure 8 This is a schematic diagram of an embodiment of the fan housing and output pipe portion in a fan assembly according to the present invention;

[0031] Figure 9 yes Figure 8 Enlarged view of section E in the middle;

[0032] Figure 10 This is a schematic diagram of an embodiment of the connector portion in a pipe connection structure according to the present invention;

[0033] Figure 11 yes Figure 10 Enlarged view of section F in the middle;

[0034] Figure 12 This is a schematic diagram of an embodiment of the connecting plate and connecting column portion in a pipeline connection structure of the present invention;

[0035] Figure 13 yes Figure 12 Enlarged view of section G in the middle;

[0036] Figure 14 This is a cross-sectional view of an embodiment of the connecting plate and connecting column portion in a pipeline connection structure of the present invention;

[0037] Figure 15 This is a schematic diagram of an embodiment of the positioning component in a pipeline connection structure according to the present invention;

[0038] Figure 16 yes Figure 15 Enlarged view of section H in the middle;

[0039] Figure 17 This is an exploded view of an embodiment of the positioning component in a pipeline connection structure according to the present invention;

[0040] Figure 18 yes Figure 17 Enlarged view of section J in the middle;

[0041] Figure 19 yes Figure 17 A magnified view of section K in the middle;

[0042] Figure 20 This is a cross-sectional view of an embodiment of the first component part in a pipeline connection structure of the present invention.

[0043] The components are as follows: 1. Output pipe; 2. Connecting ring; 3. Limiting ring; 3a. First positioning hole; 4. Connector; 4a. Connecting part; 4b. Transition part; 5. Mating ring; 6. Fitting ring; 7. Second positioning hole; 8. Connecting plate; 9. Connecting post; 10. Positioning component; 10a. First sub-component; 10b. Second sub-component; 11. Relief groove; 12. Engaging groove; 13. Engaging bevel; 14. Engaging protrusion; 15. Elastic layer; 16. Linkage component; 17. Drive part; 18. Connecting body; 19. Anti-detachment post; 20. Anti-detachment groove; 21. Termination groove; 22. Termination protrusion; 23. Guide post; 24. Operating ramp; 25. Fan housing. Detailed Implementation

[0044] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the pipeline connection structure and fan assembly proposed in this invention. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, used only to facilitate and clarify the illustration of the embodiments of this invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0045] A pipe connection structure, such as Figures 1 to 20 As shown, it includes:

[0046] An output tube 1 with a rectangular cross-section has a connecting ring 2 horizontally arranged on the outer wall of the top end of the output tube 1, a limiting ring 3 vertically arranged on the top outer side of the connecting ring 2, and a first positioning hole 3a horizontally passing through the limiting ring 3.

[0047] The connector 4 includes a connecting part 4a and a transition part 4b communicating with the top of the connecting part 4a. The cross-section of the connecting part 4a is a rectangle that matches the output tube 1. A mating ring 5 is horizontally arranged on the bottom outer wall of the connecting part 4a. A fitting ring 6 is vertically arranged on the top outer side of the mating ring 5. The mating ring 5 fits against the top of the connecting ring 2. The fitting ring 6 fits against the inner wall of the limiting ring 3. A second positioning hole 7 that matches the first positioning hole 3a is opened on the fitting ring 6.

[0048] A connecting plate 8 is provided with a plurality of connecting posts 9, each connecting post 9 passing through a first positioning hole 3a and a second positioning hole 7. There are four connecting plates 8, which are attached to the outer walls of four limiting rings 3. If the output tube 1 is square, the four connecting plates 8 are all the same size. However, if the output tube 1 is rectangular, it is preferable that the connecting plates 8 are divided into two pairs, one pair being longer than the other pair.

[0049] A positioning mechanism is provided to fix the position of the connecting plate 8.

[0050] The positioning mechanism includes a positioning member 10. The lower side of the positioning member 10 is provided with a plurality of clearance grooves 11. Each clearance groove 11 has a connecting post 9. The side of the connecting post 9 is vertically provided with a locking groove 12. The side of the locking groove 12 near the connecting part 4a is a locking bevel 13. The locking bevel 13 is inclined, and the minimum distance between the bottom of the locking bevel 13 and the connecting part 4a is less than the minimum distance between the top of the locking bevel 13 and the connecting part 4a. The clearance groove 11 is provided with a locking protrusion 14 that can pass through the locking groove 12. One side of the locking protrusion 14 is attached to the locking bevel 13.

[0051] An elastic layer 15, which is continuously compressed, is provided between the connecting plate 8 and the limiting ring 3. The elastic layer 15 is fixedly connected to the connecting plate 8.

[0052] Each of the connecting posts 9 has two engaging grooves 12, which are symmetrically distributed on both sides of the connecting post 9. The side of the engaging protrusion 14 is connected to the inner wall of the relief groove 11. The inner side of the positioning member 10 is attached to the outer wall of the connecting part 4a, and the outer side is attached to the inner wall of the fitting ring 6.

[0053] The top of the positioning member 10 is provided with a linkage member 16 with an L-shaped longitudinal section. The top of the inner wall of the linkage member 16 is attached to the fitting ring 6 and the limiting ring 3, and the inner wall of the vertical part is attached to the outer wall of the limiting ring 3. The bottom of the linkage member 16 is provided with a driving part 17 with an arc-shaped longitudinal section. The opening of the driving part 17 faces away from the connecting part 4a. The projections of the middle, top and bottom of the driving part 17 in the vertical direction are arranged in sequence.

[0054] When the middle part of the driving part 17 is attached to the top of the outer side of the connecting plate 8, the engaging protrusion 14 is higher than the engaging groove 12, and the free end of the connecting post 9 abuts against the outer wall of the connecting part 4a. The projection of the engaging oblique edge 13 in the vertical direction is misaligned with the projection of the engaging protrusion 14 in the vertical direction.

[0055] The positioning element 10 is L-shaped, and the combined shape of the two positioning elements 10 matches the shape enclosed by the connecting part 4a, the mating ring 5 and the fitting ring 6. The positioning element 10 has the linkage element 16 on both sides.

[0056] A connecting body 18 is vertically arranged on one end of one positioning member 10 near the side of another positioning member 10. An anti-detachment post 19 is vertically arranged on the free end of the connecting body 18. The diameter of the anti-detachment post 19 is greater than the width of the connecting body 18. The top and bottom of the connecting body 18 and the anti-detachment post 19 are at the same height as the top and bottom of the positioning member 10, respectively. An anti-detachment groove 20 is opened at the other end of the positioning member 10 to cooperate with the connecting body 18 and the anti-detachment post 19.

[0057] The two positioning components 10 are a first component 10a and a second component 10b. The bottom of the connecting body 18 on the first component 10a is vertically provided with a termination groove 21. The anti-detachment groove 20 on the second component 10b is provided with a termination protrusion 22 that cooperates with the termination groove 21. The top of the anti-detachment post 19 on the second component 10b is provided with a guide post 23. The guide post 23 is coaxial with the anti-detachment post 19 and has the same diameter. The top of the guide post 23 is chamfered or rounded.

[0058] There is a set distance between the top of the linkage 16 and the outer wall of the connecting part 4a. The top of the linkage 16 is inclined with an operating ramp 24 on the side near the connecting part 4a. The longitudinal section of the operating ramp 24 is an arc shape with the opening facing the outer wall of the connecting part 4a.

[0059] The present invention also provides a fan assembly, including a fan housing 25 and a pipeline connection structure as described in any of the preceding claims, wherein the output pipe 1 communicates with the fan housing 25. A centrifugal impeller is also provided inside the fan housing 25, and a power motor for driving the impeller is connected externally to the impeller; an air inlet is provided on the side of the fan housing 25; during operation, the power motor drives the centrifugal impeller to rotate, and air enters the fan housing 25 through the air inlet, moves under the centrifugal force of the impeller, and is finally output from the output pipe 1, entering the connecting part 4a, and from the connecting part 4a into the transition part 4b, and then output outward. The connecting part 4a has a rectangular cross-section, while the transition part 4b is frustum-shaped or a combination of frustum-shaped and cylindrical (as shown in the attached figure). In actual use, the top of the transition part 4b can either be directly connected to the structure requiring air supply, or it can still have a flange on the top of the transition part 4b, and then connect to other structures through the flange. Even though the top of the transition section 4b is connected to other structures via a conventional flange, the connection between the connecting section 4a and the output pipe 1 via the structure of this application makes assembly more convenient, efficient, and stable.

[0060] It should also be understood that the connection structure of this application can be applied to the connection of the output pipe 1 of the fan or to the connection of other output pipes 1, but is preferably a non-liquid pipe connection.

[0061] The present invention provides a pipeline connection structure and a fan assembly. When connecting the connecting part 4a to the output pipe 1, the connecting part 4a is first placed on the top of the output pipe 1. At this time, the mating ring 5 is attached to the top of the connecting ring 2, the fitting ring 6 is attached to the inner wall of the limiting ring 3, and all the second positioning holes 7 correspond to the corresponding first positioning holes 3a. Then, after moving the four connecting plates 8 to the appropriate positions, all the connecting posts 9 are passed through the first positioning holes 3a and the second positioning holes 7. Finally, the positions of the four connecting plates 8 are fixed using a positioning mechanism. Since only the positions of the four connecting plates 8 need to be fixed in the entire operation, the efficiency of operation and assembly can be improved.

[0062] During actual assembly, after placing the connecting part 4a on top of the output tube 1, take four connecting plates 8 respectively and insert the connecting post 9 into the first positioning hole 3a and the second positioning hole 7 respectively until the elastic layer 15 (such as the rubber layer or silicone layer) adheres to the outer wall of the limiting ring 3. Since the output tube 1 is in a vertical state, even if the connecting plate 8 is released, the connecting plate 8 can remain in its original position.

[0063] After the four connecting plates 8 are in place, the two positioning pieces 10 are fastened to the outer wall of the connecting part 4a from both sides. At this time, the first part 10a is on top and the second part 10b is on the bottom. Then, while maintaining the height of the second part 10b, the first part 10a is lowered. Finally, the first part 10a and the second part 10b are fastened together by the connecting body 18, the anti-detachment post 19, and the anti-detachment groove 20, forming a whole. In actual operation, when the bottom of the termination groove 21 touches the top of the termination protrusion 22, it indicates that this... The first component 10a and the second component 10b are assembled, making the assembly operation simpler. At the same time, during the sliding of the first component 10a and the second component 10b, relative movement between the first component 10a and the second component 10b can be effectively prevented. During the descent of the first component 10a and the second component 10b, the outer wall of the connecting part 4a can also limit and guide the first and second components, which also ensures the position and connection stability of the first component 10a and the second component 10b from the side.

[0064] The guide post 23 is higher than the second component 10b. Therefore, before the first component 10a and the second component 10b are assembled, the guide post 23 will first be inserted into the anti-detachment groove 20 of the first component 10a. Then, the guide post 23 will guide the first component 10a and the second component 10b to fit or engage. Since the guide post 23 can be observed and adjusted by the naked eye, the operation is simpler and more convenient. At the same time, the top of the guide post 23 is rounded or chamfered, which facilitates the fit and connection between the guide post 23 and the anti-detachment groove 20.

[0065] After the first component 10a and the second component 10b are assembled, their height continues to decrease. Since the driving part 17 is lower than the first component 10a and the second component 10b, the driving part 17 will first act on the outer wall of the connecting plate 8. At the same time, since the longitudinal section of the driving part 17 is arc-shaped, the driving part 17 can drive the connecting plate 8 to move closer to the connecting part 4a, while compressing the elastic layer 15. During this movement, the connecting plate 8 also applies an outward force to the connecting member. However, since the first component 10a and the second component 10b are interlocked by the anti-detachment post 19, the connecting body 18, and the anti-detachment groove 20, the first component 10a and the second component 10b will not separate. Therefore, only all four connecting plates 8 can be driven to move closer to the connecting part 4a at the same time.

[0066] When the middle part of the drive unit 17 acts on the outer wall of the connecting plate 8, the movement of the connecting plate 8 reaches its maximum. At the same time, the engaging protrusion 14 also moves to the top of the engaging groove 12. As the first part 10a and the second part 10b continue to descend, although the connecting plate 8 will not continue to approach the connecting part 4a, the height of the engaging protrusion 14 continues to decrease, allowing the engaging protrusion 14 to enter the engaging groove 12.

[0067] When the middle part of the drive unit 17 separates from the bottom of the connecting plate 8, the connecting plate 8 and the multiple connecting posts 9 move outward under the elastic force of the elastic layer 15. At this time, although the engaging bevel 13 is attached to the side of the engaging protrusion 14 near the connecting part 4a, the connecting posts 9 will only drive the engaging protrusion 14 and the positioning member 10 to move downward because the shape of the engaging bevel 13 is inclined outward. Until the engaging bevel 13 is completely attached to the engaging protrusion 14, the first part 10a and the second part 10b enter the space formed by the connecting part 4a, the mating ring 5 and the fitting ring 6, and complete the connection between the connecting part 4a and the output tube 1.

[0068] At this time, under the action of the elastic layer 15, the connecting post 9 continuously has outward movement force. Since the engaging inclined edge 13 is inclined, it can ensure the position of the engaging protrusion 14. The engaging protrusion 14, in turn, ensures the position of the connecting post 9. Therefore, the connecting post 9 has sufficient positional stability, so the connecting post 9 can stably connect the limiting ring 3 and the fitting ring 6, and thus stably connect the output pipe 1 and the connecting part 4a, ensuring the stability of the connection. Compared with the conventional use of bolts (which are prone to loosening with the increase of use time), the positional stability of this application is more sufficient. Moreover, during normal use, the elastic layer 15 ensures the stable connection between the connecting post 9 and the positioning member 10. Even if the elastic layer 15 falls off, oxidizes, or otherwise deteriorates with the increase of use time, the positioning member 10 can still stably maintain the positioning of the connecting post 9 under its own weight, resulting in better positioning durability. Furthermore, even if the elastic layer 15 is no longer present, the driving part 17 is limited in the vertical direction by the connecting plate 8, thus better preventing the positioning member 10 from falling off.

[0069] Furthermore, conventionally, the output pipe 1 and the connecting part 4a are fixedly connected by a flange; however, the output pipe 1 vibrates continuously during use, which accelerates the loosening of the bolts. But with the structure of this application, even if the output pipe 1 vibrates, the vibration of the output pipe 1 in the horizontal direction is absorbed by the fixed fitting ring 6 and the limiting ring 3, and the vibration in the vertical direction is absorbed by the connecting post 9. The connecting post 9 is horizontal, so it is subjected to less or no force, which can ensure positional stability from the source. In summary, the connecting ring 2, the limiting ring 3, the fitting ring 5 and the fitting ring 6 can improve the connection stability of the output pipe 1 and the connecting part 4a from the side, while the positioning member 10 and the connecting post 9 can further improve the connection stability.

[0070] The entire assembly process is simple and convenient. After placing the connecting part 4a and the connecting plate 8, assemble the first component 10a and the second component 10b, and then press down on the first component 10a and the second component 10b to complete the assembly. The operation is simple and convenient, and the stability is higher. At the same time, the operation of pressing the connecting plate 8 and the elastic layer 15 does not need to be performed separately, which makes the operation more convenient and reduces labor costs by eliminating the need for multiple people to work together.

[0071] The engaging groove 12 is provided on both sides of the connecting post 9, which improves the limiting stability of the connecting post 9 and prevents the connecting post 9 from deforming. Secondly, the side of the engaging protrusion 14 is connected to the side wall of the relief groove 11, thus ensuring the strength of the engaging protrusion 14. The bottom of the engaging protrusion 14 has the largest width, but it is still smaller than the minimum width of the top of the engaging groove 12, so that the engaging protrusion 14 can enter the engaging groove 12.

[0072] In actual operation, workers only need to press down on the operating ramp 24 with both hands. The operating ramp 24 prevents fingers from slipping or getting scratched, improving ease of operation and safety. At the same time, when the drive unit 17 is attached to the outer wall of the connecting plate 8, the end of the connecting post 9 abuts against the outer wall of the connecting part 4a. This maximizes the length of the connecting post 9 while ensuring all functions are complete, so that the engaging groove 12, engaging protrusion 14, etc., can all have sufficient dimensions.

[0073] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0074] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A pipe connection structure, characterized in that, include: An output tube (1) with a rectangular cross-section is provided with a connecting ring (2) horizontally arranged on the outer wall of the top end of the output tube (1), and a limit ring (3) is vertically arranged on the top outer side of the connecting ring (2), and a first positioning hole (3a) is opened horizontally through the limit ring (3). The connector (4) includes a connecting part (4a) and a transition part (4b) communicating with the top of the connecting part (4a). The cross-section of the connecting part (4a) is a rectangle that matches the output tube (1). A mating ring (5) is horizontally arranged on the bottom outer wall of the connecting part (4a). A fitting ring (6) is vertically arranged on the top outer side of the mating ring (5). The mating ring (5) fits against the top of the connecting ring (2). The fitting ring (6) fits against the inner wall of the limiting ring (3). A second positioning hole (7) that matches the first positioning hole (3a) is opened on the fitting ring (6). A connecting plate (8) is provided with a plurality of connecting posts (9), each connecting post (9) passing through a first positioning hole (3a) and a second positioning hole (7). There are four connecting plates (8), and the four connecting plates (8) are attached to the outer wall of the four limiting rings (3). A positioning mechanism is provided for fixing the position of the connecting plate (8); The positioning mechanism includes a positioning component (10). The lower side of the positioning component (10) is provided with a plurality of clearance grooves (11). Each clearance groove (11) has a connecting post (9). The side of the connecting post (9) is provided with a vertical engaging groove (12). The side of the engaging groove (12) near the connecting part (4a) is an engaging inclined edge (13). The engaging inclined edge (13) is inclined. The minimum distance between the bottom of the engaging inclined edge (13) and the connecting part (4a) is less than the minimum distance between the top of the engaging inclined edge (13) and the connecting part (4a). The clearance groove (11) is provided with an engaging protrusion (14) that can pass through the engaging groove (12). One side of the engaging protrusion (14) is attached to the engaging inclined edge (13). An elastic layer (15) that is constantly in a compressed state is provided between the connecting plate (8) and the limiting ring (3); The inner side of the positioning member (10) is attached to the outer wall of the connecting part (4a), and the outer side is attached to the inner wall of the fitting ring (6). The top of the positioning member (10) is provided with a linkage member (16) with an L-shaped longitudinal section. The top of the inner wall of the linkage member (16) is attached to the fitting ring (6) and the limiting ring (3). The inner wall of the vertical part is attached to the outer wall of the limiting ring (3). The bottom of the linkage member (16) is provided with a driving part (17) with an arc-shaped longitudinal section. The opening of the driving part (17) faces away from the connecting part (4a). The projections of the middle, top and bottom of the driving part (17) in the vertical direction are arranged in sequence. When the middle part of the driving part (17) is attached to the top of the outer side of the connecting plate (8), the engaging protrusion (14) is higher than the engaging groove (12), and the free end of the connecting post (9) abuts against the outer wall of the connecting part (4a). The projection of the engaging oblique edge (13) in the vertical direction is misaligned with the projection of the engaging protrusion (14) in the vertical direction.

2. The pipeline connection structure according to claim 1, characterized in that, The elastic layer (15) is fixedly connected to the connecting plate (8).

3. A pipeline connection structure according to claim 1 or 2, characterized in that, Each of the connecting posts (9) has two engaging grooves (12) which are symmetrically distributed on both sides of the connecting post (9). The side of the engaging protrusion (14) is connected to the inner wall of the relief groove (11).

4. The pipeline connection structure according to claim 1, characterized in that, The positioning element (10) is L-shaped, and the combined shape of the two positioning elements (10) matches the shape enclosed by the connecting part (4a), the mating ring (5) and the fitting ring (6). The positioning element (10) has the linkage element (16) on both sides. A connecting body (18) is vertically arranged on one end of one positioning member (10) near the side of another positioning member (10). An anti-detachment column (19) is vertically arranged on the free end of the connecting body (18). The diameter of the anti-detachment column (19) is greater than the width of the connecting body (18). The top and bottom of the connecting body (18) and the anti-detachment column (19) are at the same height as the top and bottom of the positioning member (10), respectively. An anti-detachment groove (20) is opened at the other end of the positioning member (10) to cooperate with the connecting body (18) and the anti-detachment column (19).

5. A pipeline connection structure according to claim 4, characterized in that, The two positioning components (10) are a first component (10a) and a second component (10b). The bottom of the connecting body (18) on the first component (10a) is vertically provided with a termination groove (21). The anti-detachment groove (20) on the second component (10b) is provided with a termination protrusion (22) that cooperates with the termination groove (21). The top of the anti-detachment column (19) on the second component (10b) is provided with a guide column (23). The guide column (23) is coaxial with the anti-detachment column (19) and has the same diameter. The top of the guide column (23) is chamfered or rounded.

6. The pipeline connection structure according to claim 1, characterized in that, There is a set distance between the top of the linkage (16) and the outer wall of the connecting part (4a). An operating ramp (24) is inclined on the side of the top of the linkage (16) near the connecting part (4a). The longitudinal section of the operating ramp (24) is an arc shape with an opening facing the outer wall of the connecting part (4a).

7. A fan assembly, characterized in that, It includes a fan housing (25) and a pipeline connection structure as described in any one of claims 1-6, wherein the output pipe (1) is connected to the fan housing (25).

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