Novel air pipe

Abstract

The utility model provides a novel air pipe. The novel air pipe comprises a pipeline and a connecting piece used for pipeline connection. The pipeline body is a pipe body, the pipe body is of a thin-wall structure, the section of the pipeline is rectangular, and the pipeline is provided with two sets of parallel faces. A supporting edge is arranged at the end part of each group of parallel surfaces of the pipeline, and a sealing edge is arranged at one end of each supporting edge; the connecting piece is an inserting strip which is of a double-wall structure. The insertion strip is provided with a locking part used for being connected with a pipeline. And the locking part is engaged with the supporting edge and the sealing edge of the pipeline, so that the connection of the pipeline is realized. Compared with the prior art, the manufacturing method has the advantages that manufacturing of the structural part can be achieved only through profiling and bending; the pipeline and the connecting piece can be installed and fastened manually or through a mechanical tool, construction is convenient and fast, and the labor intensity is low; and the pipeline is suitable for different installation scenes and use conditions, low in material consumption and light in overall mass.

Description

Technical Field

[0001] This utility model relates to the field of ventilation technology, and in particular to a novel air duct and its construction method. Background Technology

[0002] Currently, most air ducts use angle steel flanges, which are then connected to galvanized iron ducts, utilizing the rigidity of the flanges as the connecting element. This method consumes a large amount of material, requiring welding between the flanges and the duct, as well as drilling and rust prevention treatments on the flanges. The manufacturing process is cumbersome, wasteful of materials, and environmentally unfriendly. Because the sealing between flanges uses sealing strips and other materials, and rust prevention is generally achieved through painting, both of these steps contribute to environmental problems and material waste.

[0003] At the same time, due to the use of flanges, the overall weight of the duct is relatively heavy, making construction difficult and requiring high labor intensity for workers.

[0004] However, without flanges, the pipe will sag in the middle due to its own weight. Over time, this will cause severe pipe deformation and poor sealing performance.

[0005] The market urgently needs a lightweight, easy-to-install duct that can also guarantee sealing and strength, along with corresponding installation methods. Utility Model Content

[0006] The purpose of this invention is to solve at least one of the technical problems existing in the prior art. The new type of air duct can solve the problem of sealing ventilation ducts with lightweight materials, and can improve the installation effect and speed.

[0007] This application provides a novel air duct, including a pipe and a connector for pipe connection;

[0008] The main body of the pipeline is a single tube with a thin-walled structure. The cross-section of the pipeline is rectangular, and the pipeline has two sets of parallel surfaces.

[0009] A support edge is provided at the end of each set of parallel surfaces of the pipeline, and a sealing edge is provided at one end of the support edge;

[0010] The connector is a plug-in strip, which has a double-wall structure;

[0011] The insert is equipped with a locking part for connecting the pipe;

[0012] The locking part engages with the support and sealing edges of the pipe to connect the pipe.

[0013] Furthermore, the locking parts are located on both sides of the support edge.

[0014] The locking part has two arms, each of which is U-shaped, and the sealing edge is located within the U-shaped structure of the two arms of the locking part.

[0015] Furthermore, the insert includes insert one and insert two.

[0016] Insert one is used to connect a set of parallel surfaces of a pipe, and the length of the locking part of insert one is the same as the length of the supporting edge of the set of parallel surfaces;

[0017] Insert 2 is used to connect another set of parallel surfaces. The length of insert 2 is the sum of the length of the supporting side of the set of parallel surfaces and twice the height of insert 1 after it is pressed together.

[0018] L = l + h * 2;

[0019] L is the length of insert two;

[0020] l is the length of the supporting edge of the parallel surface of the two inserts connected;

[0021] h is the height of the insert after it is pressed together;

[0022] The height of the insert after it is pressed is the distance from the end of the locking part away from the support bar to the end of the closed part away from the support bar after the locking part of the insert is pressed.

[0023] Furthermore, the insert can be either a Class I or Class II insert;

[0024] Insert 2 uses Class I inserts;

[0025] One type of insert includes a locking part for connecting pipes, the locking part having a double-wall structure;

[0026] A support bar is provided at the top of the locking part, and a closed end is provided at the other end of the support bar;

[0027] Both the support strip and the closed end are double-walled structures;

[0028] The second type of insert includes a locking part for connecting pipes, and the locking part has a double-wall structure;

[0029] A support bar is provided at the top of the locking part, and a closed end is provided at the other end of the support bar;

[0030] Both the support strip and the closed end are double-walled structures;

[0031] Extension sections are provided at both ends of the support bar;

[0032] The end of the extension section is provided with a connecting edge.

[0033] Furthermore, the sealing edge and the supporting edge form an angle;

[0034] The supporting edge is at a 90-degree angle to the rectangular surface of the pipe;

[0035] The sealing edge and the supporting edge form a fold angle, which is controlled between 30 degrees and 60 degrees;

[0036] The locking part of the insert used to connect the pipeline is of a V-shaped structure, and each side arm of the V-shaped structure is of a U-shaped structure. The angle of the V-shaped structure is set to match the fold angle;

[0037] The cross-section of the insert is generally Y-shaped;

[0038] The included angle formed by the connecting edge and the extension section is the same as the fold angle formed by the sealing edge and the supporting edge.

[0039] Furthermore, a reinforcing bulge is also provided on the pipe body near the supporting edge;

[0040] The supporting strip and the closed end are integrally formed with the locking part.

[0041] Furthermore, the closed end is located on both sides of the supporting strip. One side is of a "凵" shape, and the other side is of an L-shaped and U-shaped interlocking structure;

[0042] The U-shaped and L-shaped interlocking structure is just used for locking the double-wall structure to prevent the double-wall structure from loosening;

[0043] After the insert is connected to the pipeline and undergoes a pressing operation, the cross-section of the locking part is generally of a C-shaped structure and bites tightly with the sealing edge and the supporting edge of the pipeline;

[0044] After a certain type of insert is connected to the pipeline and undergoes a pressing operation, the cross-section of the locking part is generally of a C-shaped structure and bites tightly with the sealing edge and the supporting edge of the pipeline, or bites tightly with the extension section and the connecting edge.

[0045] Furthermore, after the pressing of a certain type of insert, a fixing piece is used for fixing, and the fixing position is the position of the pressed supporting edge and sealing edge.

[0046] Furthermore, after the pressing of a certain type of insert, a fixing piece is used for fixing, and the fixing position is the position of the pressed extension section and the supporting edge.

[0047] Furthermore, a fastener is installed on the end face of the second insert. The fastener is generally of a single-sided open shell shape, and the installation surface is of a 士-shaped or 土-shaped;

[0048] The fastener is successively provided with a limiting part, an expansion part, a contraction part and a positioning part;

[0049] The expansion part is used to be stuck into the locking part of the second insert;

[0050] The contraction part is used to be stuck into the supporting strip of the second insert;

[0051] The positioning part is used to be stuck into the closed end of the second insert;

[0052] The limiting part is used to be stuck into the closed end of the first insert.

[0053] Furthermore, after the fasteners are installed, fasteners are used to connect and secure the fasteners to the second insert.

[0054] The fixed position is set in the contraction section.

[0055] Furthermore, the fastener is made of rivets or bolts.

[0056] Compared with existing technologies, the beneficial effects are:

[0057] This application redesigns both the pipes and the connectors. Through the new structural design and innovative connection methods, it enables the fabrication of structural components solely through pressing and bending.

[0058] Pipes and fittings can be installed and fastened manually or with mechanical tools, making construction convenient and reducing labor intensity.

[0059] It is suitable for different installation scenarios and operating conditions, with low material consumption and light overall pipe weight. Attached Figure Description

[0060] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0061] Figure 1 A perspective view of the pipes in one embodiment;

[0062] Figure 2 A perspective view of a reinforced drum duct in one embodiment;

[0063] Figure 3 A side view of a reinforced drum duct in one embodiment;

[0064] Figure 4 A perspective view of one type of insert in one embodiment;

[0065] Figure 5 This is a side view of one type of insert in one embodiment;

[0066] Figure 6 This is a perspective view of two types of inserts in one embodiment;

[0067] Figure 7 In one embodiment, the insert is connected to the pipe. Figure 1 ;

[0068] Figure 8In one embodiment, the insert is connected to the pipe. Figure 2 ;

[0069] Figure 9 In one embodiment, the insert is connected to the pipe. Figure 3 ;

[0070] Figure 10 for Figure 9 Side view;

[0071] Figure 11 for Figure 10 A magnified view of a portion of the image;

[0072] Figure 12 In one embodiment, the insert is connected to the pipe. Figure 4 ;

[0073] Figure 13 for Figure 12 Side view;

[0074] Figure 14 for Figure 13 A magnified view of a portion of the image;

[0075] Figure 15 This is an overall connection diagram of the fastener installed after the insert is pressed against the pipe in one embodiment;

[0076] Figure 16 for Figure 15 Top view;

[0077] Figure 17 for Figure 15 Side view;

[0078] Figure 18 for Figure 15 The front view;

[0079] Figure 19 This is a diagram showing the overall connection of the insert and the pipe after compression in one embodiment.

[0080] Figure 20 for Figure 19 Top view;

[0081] Figure 21 for Figure 20 A magnified view of a portion of the image;

[0082] Figure 22 for Figure 19 Side view;

[0083] Figure 23 for Figure 22 A magnified view of a portion of the image;

[0084] Figure 24 for Figure 19 The front view;

[0085] Figure 25 Here is a front view of the fastener in one embodiment;

[0086] Figure 26 This is a three-dimensional schematic diagram of a fastener in one embodiment;

[0087] Figure 27 This is a flowchart of the construction method.

[0088] Figure label:

[0089] 1. Pipeline; 1-1. Pipe body; 1-2. Support edge; 1-3. Sealing edge; 1-4. Angle; 1-5. Reinforcing drum;

[0090] 2. Type I insert; 2-1. Support bar one; 2-2. Closed end; 2-3. Locking part;

[0091] 3. Type II insert; 3-3. Extension section; 3-4. Connecting edge;

[0092] 4. Fasteners; 4-1. Limiting part; 4-2. Expansion part; 4-3. Contraction part; 4-4. Positioning part; 5. Fixing parts. Detailed Implementation

[0093] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0094] The application scenarios of the novel air duct of this application and its contributions to the prior art will be described in detail below with reference to the accompanying drawings and embodiments.

[0095] To address the problems of large material consumption, heavy pipe weight, and difficult construction in existing technologies, this invention proposes a novel air duct and its construction method. This method solves the problems existing in the prior art, ensuring the air duct's sealing and strength while also featuring a lightweight overall air duct, simple component structure, and convenient and quick construction.

[0096] This invention redesigns both the pipes and the connectors. Through the new structural design and innovative connection methods, it enables the fabrication of structural components solely through pressing and bending, and allows for the installation and fastening of the pipes and connectors to be performed manually or with mechanical tools.

[0097] Suitable for different installation scenarios and operating conditions, the overall pipeline is lightweight, saves materials, and meets environmental protection requirements.

[0098] A novel air duct includes a pipe 1 and a connector for connecting the pipe 1.

[0099] like Figure 1-3 As shown;

[0100] The main body of pipe 1 is a pipe body 1-1, which is a thin-walled structure. The cross-section of pipe 1 is rectangular, and pipe 1 has two sets of parallel surfaces.

[0101] A support edge 1-2 is provided at the end of each set of parallel surfaces of pipe 1, and a sealing edge 1-3 is provided at one end of the support edge 1-2;

[0102] The supporting edges 1-2 are at a 90-degree angle to the rectangular surface of pipe 1;

[0103] The sealing edge 1-3 and the supporting edge 1-2 form an angle 1-4. For the convenience of subsequent connection and tightening operations, the angle 1-4 is controlled between 30 degrees and 60 degrees, preferably between 40 degrees and 50 degrees.

[0104] To increase the end strength of the rectangular surface of the pipe body 1-1, a reinforcing drum 1-5 is also provided on the pipe body 1-1 near the supporting edge 1-2.

[0105] like Figure 4-5 As shown,

[0106] The connector uses insert strips;

[0107] One type of insert is a type 2 insert, wherein the locking part 2-3 of the insert 2 used to connect the pipe 1 has a V-shaped structure, and each side arm of the V-shaped structure has a U-shaped structure. The angle of the V-shaped structure is matched with the bend angle 1-4.

[0108] Type 1 insert 2 adopts a double-wall structure, which can be formed by bending metal plates.

[0109] To further increase the strength of the connector, a support strip 2-1 is provided at the V-shaped top of the first type of insert 2, and a closed end 2-2 is provided at the other end of the support strip 2-1;

[0110] Both the support bar 2-1 and the closed end 2-2 are double-walled structures. They can also be processed using a bending technique.

[0111] The support bar 2-1 and the closed end 2-2 can be integrally formed with the locking part 2-3.

[0112] The closed end 2-2 is located on both sides of the support bar 2-1, one side is "U" shaped, and the other side is an interlocking structure of L-shaped and U-shaped.

[0113] The U-shaped and L-shaped interlocking structure is used to lock the double-wall structure and prevent it from loosening.

[0114] The cross-section of a type of insert 2, which is equipped with a support bar 2-1 and a closed end 2-2, is Y-shaped.

[0115] The purpose of adopting a double-wall structure for the insert is that it has the locking and clamping effect of a single-layer structure, while the outer wall of the double-wall structure also serves as a support and fixation for the flange, which not only prevents the inner wall from loosening and deforming, but also increases the rigidity and strength of the insert.

[0116] Meanwhile, the support bar 2-1 and the closed end 2-2 limit the possible deformation of the locking part 2-3, further restricting the loosening and deformation of the insert locking part 2-3.

[0117] The reinforcing drums 1-5 can also fix the inserts after molding to prevent them from loosening.

[0118] like Figure 6 As shown;

[0119] To achieve a more robust connection of pipe 1, a second type of insert 3 was designed based on the first type of insert 2. The structure and function of the second type of insert 3 are the same as those of the first type of insert 2, so we will not repeat them here, but only describe the differences.

[0120] The improvement is that extension sections 3-4 are provided at both ends of the support bar 2-1; the end of the extension section 3-4 is provided with a connecting edge 3-5; the angle formed by the connecting edge 3-5 and the extension section 3-4 is consistent with the angle of the bend 1-4 formed by the sealing edge 1-3 and the support edge 1-2.

[0121] After the second-class insert 3 is connected to the pipe 1 and subjected to a compression operation, the locking part 2-3 has an overall C-shaped structure, which interlocks with the sealing edge 1-3 and the supporting edge 1-2 of the pipe 1.

[0122] After the insertion strip 2 is connected to the pipe 1 and subjected to a compression operation, the locking part 2-3 has an overall C-shaped cross-section, which interlocks with the sealing edge 1-3 and the supporting edge 1-2 of the pipe 1; it can also interlock with the extension section 3-4 and the connecting edge 3-5.

[0123] Example 1

[0124] like Figure 12-14 As shown in 19-24,

[0125] Place the two ends of pipe 1 facing each other, and align the support edges 1-2 of the two pipes 1.

[0126] Using a type of insert 2 as insert one, a set of parallel surfaces of pipe 1 are connected. The length of the locking part 2-3 of insert one is the same as the length of the supporting edge 1-2 of the set of parallel surfaces.

[0127] The method involves inserting the strip from one side of the two supporting edges 1-2 and the sealing edge 1-3, so that the two sealing edges 1-3 are located within the U-shaped structures on both sides of the V-shaped structure of the first-type insert 2. The first-type insert 2 is then pressed tightly by hand hammering or a seaming machine, so that the first-type insert 2 is engaged and locked with the supporting edges 1-2 and the sealing edges 1-3 of the pipe 1.

[0128] Then, another type of insert 2 is used as insert two to connect another set of parallel surfaces, passing through the support side 1-2 and sealing side 1-3 of pipe 1, so that the support side 1-2 and sealing side 1-3 are located in the U-shaped structure on both sides of the V-shaped structure of insert two.

[0129] The insert is pressed by hand or by a seaming machine to lock it in place with the support edge 1-2 and the sealing edge 1-3 of the pipe 1.

[0130] The length of insert two is the sum of the length of the support edge 1-2 of the parallel surface group and twice the height of insert one after it is pressed.

[0131] L = l + h * 2;

[0132] L is the length of insert two;

[0133] l is the length of the supporting edge 1-2 of the parallel surface of the insert two connections;

[0134] h is the height of the insert after it is pressed together;

[0135] The height of the insert after it is pressed is the distance from the end of the locking part 2-3 away from the support bar 2-1 to the end of the closed end 2-2 away from the support bar 2-1 after the locking part 2-3 of the insert is pressed.

[0136] This method can utilize the two inserts on opposite sides of the previous step to achieve a further limiting effect.

[0137] To make the connection between the insert and the pipe 1 more stable, the type 1 insert 2 is fixed with fasteners after being compressed. The fasteners are located at the support edge 1-2 and the sealing edge 1-3 of the compressed section, and there are more than one fastener.

[0138] The fastener 5 can be a rivet, which can be used to fix the fastener by drilling holes at fixed positions.

[0139] Alternatively, bolts can be used for fixing after drilling.

[0140] Example 2

[0141] like Figure 7-11 As shown in 15-18,

[0142] Place the two ends of pipe 1 facing each other, and align the support edges 1-2 of the two pipes 1.

[0143] Using a type 2 insert 3 as insert one, a set of parallel surfaces of two pipes 1 are connected. The length of the locking part 2-3 of insert one is the same as the length of the supporting edge 1-2 of the set of parallel surfaces.

[0144] The method involves inserting the strip from one side of the two supporting edges 1-2 and the sealing edge 1-3, so that the two sealing edges 1-3 are located within the U-shaped structures on both sides of the V-shaped structure of the Class II strip 3. The Class II strip 3 is then pressed tightly by hand hammering or a seaming machine, so that the Class II strip 3 is engaged and locked with the supporting edges 1-2 and the sealing edges 1-3 of the pipe 1.

[0145] The length of extension 3-4 is the same as the width of support edge 1-2;

[0146] The angle between the connecting edge 3-5 and the sealing edge 1-3 is the same, and the length of the connecting edge 3-5 is less than or equal to the width of the sealing edge 1-3.

[0147] The length of support edge 1-2 is the length extending along the parallel plane of pipe 1, and the width is the fold width that is 90 degrees to the rectangular surface of pipe 1.

[0148] Then, a type 2 insert is used as the second insert to connect another set of parallel surfaces, passing through the extension section 3-4 and connecting edge 3-5 of the first insert, the supporting edge 1-2 and sealing edge 1-3 of the pipe 1, respectively, so that the connecting edge 3-5 and sealing edge 1-3, and the supporting edge 1-2 and sealing edge 1-3 of the pipe 1 are located in the U-shaped structure on both sides of the V-shaped structure of the type 2 insert.

[0149] The second type of insert 3 is pressed by hand hammering or a seaming machine, so that the second insert engages and locks with the support side 1-2 and sealing side 1-3 of the pipe 1, the extension section 3-4 and connecting side 3-5 of the first insert.

[0150] The length of insert two is the sum of the length of the support edge 1-2 of the parallel surface group and twice the height of insert one after it is pressed.

[0151] L = l + h * 2;

[0152] L is the length of insert two;

[0153] l is the length of the supporting edge 1-2 of the parallel surface of the insert two connections;

[0154] h is the height of the insert after it is pressed together;

[0155] The height of the insert after it is pressed is the distance from the end of the locking part 2-3 away from the support bar 2-1 to the end of the closed end 2-2 away from the support bar 2-1 after the locking part 2-3 of the insert is pressed.

[0156] This method can connect the pipeline 1, the first type of insert 2, and the second type of insert 3 into one body, with a more stable structure, higher strength, and better anti - detachment performance of the inserts.

[0157] In order to improve the overall strength of the insert and further stabilize the connection, after the first type of insert 2 is compressed, a fixing part is used for fixation. The fixing position is at the position of the compression extension section 3 - 4 and the support edge 1 - 2, and the number is more than one.

[0158] The fixing part 5 can be in the form of a rivet. Holes can be drilled at the fixing position and rivets can be used for fixation.

[0159] It can also be in the form of fixing with bolts after drilling holes.

[0160] Embodiment Three

[0161] As Figure 25-26 shown,

[0162] In order to further increase the structural strength of the insert and the supporting effect on the pipeline 1, a fastener 4 is installed on the end face of the second insert. The fastener 4 can make the connection between the first type of inserts 2 in Embodiment One or the connection between the first type of insert 2 and the second type of insert 3 in Embodiment Two more stable and have higher rigid strength.

[0163] The fastener 4 is in the shape of a hollow shell with a unilateral opening as a whole, and the installation surface is in the shape of a cross or a modified cross. 4]

[0164] The fastener 4 is successively provided with a limiting part 4 - 1, an expansion part 4 - 2, a contraction part 4 - 3, and a positioning part 4 - 4.

[0165] The expansion part 4 - 2 is used to be stuck into the locking part 2 - 3 of the second insert; Z

[0166] The contraction part 4 - 3 is used to be stuck into the support strip 2 - of the second insert;

[0167] The positioning part 4 - 4 is used to be stuck into the closed end 2 - 2 of the second insert;

[0168] The limiting part 4 - 1 is used to be stuck into the closed end 2 - 2 of the first insert.

[0169] In order to prevent the fastener 4 from falling off, after the fastener 4 is installed, a fixing part 5 is used to connect and fix the fastener 4 and the second insert.

[0170] The fixing position is set at the contraction part 4 - 3, and the number is more than one.

[0171] The fixing part 5 can be in the form of a rivet. Holes can be drilled at the fixing position and rivets can be used for fixation.

[0172] It can also be in the form of fixing with bolts after drilling holes. Z

[0173] Figure 25 Two fastener 4 forms with opposite directions of positioning part 4-4 and limiting part 4-1 are given because the thickness of the part of the insert closed end 2-2 located on both sides of the support bar 2-1 is inconsistent, and the structure of the fastener 4 needs to be set accordingly.

[0174] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0175] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A novel air duct, characterized in that, Includes pipes and fittings for pipe connections; The main body of the pipeline is a single tube with a thin-walled structure. The cross-section of the pipeline is rectangular, and the pipeline has two sets of parallel surfaces. A support edge is provided at the end of each set of parallel surfaces of the pipeline, and a sealing edge is provided at one end of the support edge; The connector is a plug-in strip, which has a double-wall structure; The insert is equipped with a locking part for connecting the pipe; The locking part engages with the support and sealing edges of the pipe to connect the pipe.

2. The novel air duct according to claim 1, characterized in that, The locking parts are located on both sides of the support edge. The locking part has two arms, each of which is U-shaped, and the sealing edge is located within the U-shaped structure of the two arms of the locking part.

3. The novel air duct according to claim 2, characterized in that, The inserts include insert one and insert two. Insert one is used to connect a set of parallel surfaces of a pipe, and the length of the locking part of insert one is the same as the length of the supporting edge of the set of parallel surfaces; Insert 2 is used to connect another set of parallel surfaces. The length of insert 2 is the sum of the length of the supporting side of the set of parallel surfaces and twice the height of insert 1 after it is pressed together. L = l + h * 2; L is the length of insert two; l is the length of the supporting edge of the parallel surface of the two inserts connected; h is the height of the insert after it is pressed together; The height of the insert after it is pressed is the distance from the end of the locking part away from the support bar to the end of the closed part away from the support bar after the locking part of the insert is pressed.

4. The novel air duct according to claim 3, characterized in that, The insert can be either a Class I or Class II insert; Insert 2 uses Class I inserts; One type of insert includes a locking part for connecting pipes, the locking part having a double-wall structure; A support bar is provided at the top of the locking part, and a closed end is provided at the other end of the support bar; Both the support strip and the closed end are double-walled structures; The second type of insert includes a locking part for connecting pipes, and the locking part has a double-wall structure; A support bar is provided at the top of the locking part, and a closed end is provided at the other end of the support bar; Both the support strip and the closed end are double-walled structures; Extension sections are provided at both ends of the support bar; The end of the extension section is provided with a connecting edge.

5. The novel air duct according to claim 4, characterized in that, The sealing edge and the supporting edge form an angle; The supporting edge is at a 90-degree angle to the rectangular surface of the pipe; The sealing edge and the supporting edge form an angle, which is controlled between 30 degrees and 60 degrees. The locking part of the insert for connecting pipes has a V-shaped structure, and each side arm of the V-shaped structure has a U-shaped structure. The angle of the V-shaped structure is matched with the bend angle. The cross-section of the insert is Y-shaped. The angle formed by the connecting edge and the extension is consistent with the angle formed by the sealing edge and the supporting edge.

6. The novel air duct according to claim 5, characterized in that, include: A reinforcing drum is also installed on the tube body near the support edge; The support bar and the closed end are integrally formed with the locking part.

7. The novel air duct according to claim 6, characterized in that, include: The closed ends are located on both sides of the support bar, one side is "U" shaped, and the other side is an interlocking structure of L-shaped and U-shaped; The U-shaped and L-shaped interlocking structure is used to lock the double-wall structure and prevent it from loosening. After the insertion strip is connected to the pipe and tightened, the locking part has a C-shaped cross-section, which interlocks with the sealing edge and support edge of the pipe. After a class of inserts are connected to a pipeline and undergo a pressing operation, the overall cross-section of the locking part is a C-shaped structure, which tightly engages with the sealing edge and the supporting edge of the pipeline, or tightly engages with the extended section and the connecting edge.

8. The novel air duct according to claim 7, characterized in that, It includes: After pressing, a class of inserts are fixed using fixing parts, and the fixing positions are the pressed supporting edge and sealing edge positions.

9. The novel air duct according to claim 7, characterized in that, It includes: After pressing, a class of inserts are fixed using fixing parts, and the fixing positions are the positions of the pressed extended section and the supporting edge.

10. The novel air duct according to claim 9, characterized in that, It includes: A fastener is installed on the end face of the second insert. The fastener is in the shape of an empty shell with a single-sided opening, and the installation surface is in the shape of a cross or a modified cross; The fastener is sequentially provided with a limiting part, an expansion part, a contraction part, and a positioning part; The expansion part is used to be inserted into the locking part of the second insert; The contraction part is used to be inserted into the support strip of the second insert; The positioning part is used to be inserted into the closed end of the second insert; The limiting part is used to be inserted into the closed end of the first insert.

11. The novel air duct according to claim 10, wherein After the fastener is installed, a fixing part is used to connect and fix the fastener to the second insert; The fixing position is set at the contraction part.

12. The novel air duct according to any one of claims 8, 9, and 11, wherein The fixing part uses a rivet or a bolt.

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