Spliced ventilating duct

Abstract

The utility model provides a splicing type ventilating pipeline which comprises a plurality of pipeline split bodies which are connected end to end, and each pipeline split body comprises a first connecting plate, a second connecting plate, an air duct plate and a connecting part. A first positioning part and a second positioning part are arranged on the connecting part, a first matching part is arranged on the first connecting plate, and a second matching part is arranged on each air duct plate. The first connecting plate and the second connecting plate limit Z-direction displacement of the air duct plate, the first positioning part and the first matching part are connected in an inserted mode to limit Z-direction displacement of the connecting part, and the second positioning part and the second matching part are connected in an inserted mode to limit X-direction and Y-direction displacement of the air duct plate and the connecting part. A third positioning part is further arranged, the third positioning part releases energy elastically and is clamped into the groove, and the fourth positioning part is connected to the second connecting plate in an inserted mode to limit displacement of the second connecting plate in the Z direction. According to the utility model, the connecting parts are arranged between the adjacent air duct plates, so that the assembly of parts can be quickly completed, and the implementation is easy. And the non-alignment accuracy of the ventilation openings is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation ducts, in particular to a spliced ​​ventilation duct. Background Art

[0002] Ventilation ducts are commonly used in ventilation and air-conditioning projects in industrial, chemical and civil buildings. Most of them adopt metal or non-metallic pipes. Ventilation ducts are a kind of infrastructure for air circulation and reducing the concentration of harmful gases.

[0003] Existing ventilation ducts have circular, rectangular and other structures. In particular, ventilation ducts used to evacuate gases in the chemical industry are mostly large in shape, which makes construction, transportation and manufacturing difficult. In addition, they occupy a large area of ​​the vehicle during transportation, reducing transportation efficiency. In order to solve the above problems, the prior art proposes the use of spliced ​​ventilation ducts, that is, the ventilation ducts are disassembled into multiple scattered parts, connected by on-site welding or splicing, and then spliced ​​section by section.

[0004] However, the existing spliced ​​air duct has many parts after the appearance is disassembled, and most of the parts need to be fixed with bolts. Every two parts need to be manually spliced ​​and tightened, which seriously affects the construction efficiency. If splicing is done by on-site welding, the on-site construction conditions are poor, the workers' technical requirements are high, and implementation is difficult. In addition, the existing spliced ​​ventilation duct is fixed by bolts when each section of the pipe is connected, and the position of the bolt holes will cause the vents of each section after splicing to not correspond due to production and assembly errors, affecting the ventilation effect. Utility Model Content

[0005] In view of this, the utility model aims to provide a spliced ​​ventilation duct to reduce the difficulty of assembly and improve the assembly efficiency, and to align the vents of each section of the ventilation duct to ensure the assembly effect.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A spliced ​​ventilation duct includes a plurality of duct segments connected end to end;

[0008] The duct body comprises a first connecting plate and a second connecting plate arranged at intervals, a plurality of air duct plates arranged between the first connecting plate and the second connecting plate, and a connecting portion connected between the inner walls of the two air duct plates;

[0009] The connecting portion is provided with a first positioning portion and a second positioning portion, the first connecting plate is provided with a first matching portion matched with the first positioning portion, and each of the air duct plates is provided with a second matching portion matched with the second positioning portion;

[0010] The first connecting plate and the second connecting plate limit the displacement of the air duct plate in the Z direction, the first positioning portion and the first matching portion are plugged and connected to limit the displacement of the connecting portion in the Z direction, and the second positioning portion and the second matching portion are plugged and connected to limit the displacement of the air duct plate and the connecting portion in the X direction and the Y direction;

[0011] The connecting portion is also provided with a third positioning portion, and the second connecting plate is provided with a groove connected to the third positioning portion by clamping. When the two pipe bodies are connected end to end, the third positioning portion is pressed and deformed by abutting against the second connecting plate and approaching the first connecting plate. When the second connecting plate abuts against the first connecting plate, the third positioning portion elastically releases energy and is clamped into the groove.

[0012] The fourth positioning portion is plugged into the second connecting plate to limit the displacement of the second connecting plate in the Z direction.

[0013] Further, the first connecting plate includes a first plate body and a first vent formed in the middle of the first plate body, the second connecting plate includes a second plate body and a second vent formed in the middle of the second plate body, and two ends of the air duct plate are respectively abutted between the first plate body and the second plate body;

[0014] Each of the air duct plates surrounds an air duct, and the inner hole of the air duct is equal to the inner hole of the first vent, and the inner hole of the air duct is equal to the inner hole of the second vent.

[0015] Furthermore, the first plate body and / or the second plate body are provided with a limiting ring;

[0016] The limiting ring protrudes from the first plate body and / or the second plate body toward the air duct plate, and the inner hole of the limiting ring is adapted to the outer shape of the air duct plate; the inner hole of the limiting ring is constructed around the outer side of the air duct plate.

[0017] Furthermore, the connecting portion includes a connecting body and a fixing block fixedly connected to one end of the connecting body.

[0018] The first positioning portion is connected to an end of the fixing block close to the first connecting plate;

[0019] The third positioning portion is arranged at the lower end of the first positioning portion, and the first positioning portion and the third positioning portion are both arranged on the fixing block.

[0020] Furthermore, the first positioning portion is formed as a protrusion protruding toward the first plate body, and the first matching portion is formed as a positioning groove provided on the first plate body, and the opening end of the positioning groove faces the first vent, and when the connecting portion abuts against the inner wall of the air duct plate, the protrusion is inserted into the positioning groove.

[0021] Furthermore, the third positioning portion is formed as a hook body inclined toward the first connecting plate, the groove is formed on the second plate body, and a yield groove is provided on one end of the connecting portion close to the groove, and the yield groove and the groove form an accommodating groove for accommodating the third positioning portion.

[0022] Furthermore, the second positioning portion is formed as a flange protruding from the connecting body, and one or more flanges are arranged at one end of the connecting body close to the fixing block;

[0023] The second matching portion is respectively located at the joint of two of the air duct plates, and the second matching portion is formed as a through hole matched with the flange.

[0024] Furthermore, the connecting body is "L"-shaped, the air duct plate is "L"-shaped; the two air duct plates surround the rectangular air duct,

[0025] The two connection parts are connected to opposite corners of the air duct plate, the outer side of the connection body abuts against the inner wall of the air duct plate, and a plurality of the second positioning parts are respectively provided on both sides of the connection body.

[0026] Furthermore, a guide groove is provided on the inner side of the connecting body along its length, and the guide groove is a long groove opening toward one end of the air duct.

[0027] Furthermore, the first connecting plate and the second connecting plate are respectively provided with mounting holes.

[0028] Compared with the prior art, the utility model has the following advantages:

[0029] The spliced ​​ventilation duct described in the utility model is provided with a connection part between two air duct plates, and the first positioning part is plugged with the first matching part, and the second positioning part is plugged with the second matching part. The multiple air duct plates are connected and formed by the connection part without relative movement, thus avoiding the operation time of bolting the parts, and the parts assembly can be completed quickly. The structure is simple and easy to implement. In addition, by providing a third positioning part on the connection part, the third positioning part is connected with the groove, and the second connection plate of the next section is clamped, which can not only facilitate the positioning between the pipe splits, but also play a certain initial positioning effect. When the two pipe splits are bolted, the problem of the air vents not being able to be aligned due to the gap between the screw hole and the bolt, or the processing error is avoided.

[0030] In addition, by abutting the air duct plate between the first plate body and the second plate body, the displacement of the air duct plate in the Z direction can be limited. After the connecting portion connects the air duct plates to form the air duct, the first plate body and the second plate body are buckled together to achieve a quick assembly. Moreover, since a limiting ring is provided on the first plate body and / or the second plate body, it can further ensure that the air duct plate does not disperse. The second positioning portion is also provided to avoid the connection portion from being separated, and the separation of the pipeline is strengthened.

[0031] In addition, by providing the connecting body and the fixing block, and providing the first positioning portion and the second positioning portion on the fixing block, it is easy to process and implement, and the processing difficulty is reduced. By providing the second positioning portion as a flange and the second matching portion as a through hole, it is not only conducive to processing needs, but also convenient for rapid assembly, and the assembly level requirements of the operator are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0033] Figure 1 This is a schematic diagram of the structure of the assembled spliced ​​ventilation duct according to an embodiment of the utility model;

[0034] Figure 2 It is a front view structural schematic diagram of the spliced ​​ventilation duct according to an embodiment of the utility model;

[0035] Figure 3 for Figure 2 Schematic cross-sectional view at AA in the middle;

[0036] Figure 4 This is a schematic diagram of the three-dimensional structure of the pipeline split body according to an embodiment of the utility model;

[0037] Figure 5 for Figure 4 A partial enlarged schematic diagram of position II in the middle;

[0038] Figure 6 for Figure 3 A local enlarged schematic diagram of point I in the middle;

[0039] Figure 7 A three-dimensional schematic diagram of a connecting portion according to an embodiment of the utility model from a first viewing angle;

[0040] Figure 8 It is a stereoscopic schematic diagram of the second viewing angle of the connecting portion described in the embodiment of the utility model.

[0041] Description of reference numerals:

[0042] 1. Pipeline split;

[0043] 101, first connecting plate; 102, second connecting plate; 103, air duct plate; 104, connecting portion; 105, limiting ring; 106, mounting hole

[0044] 1011, positioning groove; 1012, first plate body; 1013, first matching portion;

[0045] 1021. a second plate body; 1022. an inclined surface;

[0046] 1031, second matching portion;

[0047] 1041. First positioning portion; 1042. Second positioning portion; 1043. Third positioning portion; 1044. Fourth positioning portion; 1045. Connecting body; 1046. Fixing block; 1047. Displacement groove; 1048. Guide groove. DETAILED DESCRIPTION

[0048] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0049] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0050] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0051] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0052] The present embodiment relates to a spliced ​​ventilation duct, which includes a plurality of duct splits 1 connected end to end, the duct splits 1 including a first connecting plate 101 and a second connecting plate 102 arranged at intervals, a plurality of air duct plates 103 arranged between the first connecting plate 101 and the second connecting plate 102, and a connecting portion 104 connected between the inner walls of the two air duct plates 103.

[0053] The connecting portion 104 is provided with a first positioning portion 1041 and a second positioning portion 1042, the first connecting plate 101 is provided with a first matching portion 1013 matched with the first positioning portion 1041, and each air duct plate 103 is provided with a second matching portion 1031 matched with the second positioning portion 1042. The first connecting plate 101 and the second connecting plate 102 limit the displacement of the air duct plate 103 in the Z direction, the first positioning portion 1041 and the first matching portion 1013 are plugged and connected to limit the displacement of the connecting portion 104 in the Z direction, and the second positioning portion 1042 and the second matching portion 1031 are plugged and connected to limit the displacement of the air duct plate 103 and the connecting portion 104 in the X direction and the Y direction. A third positioning portion 1043 is also provided on the connecting portion 104, and a groove which is clipped and connected to the third positioning portion 1043 is provided on the second connecting plate 102. When the two pipe split bodies 1 are connected end to end, the third positioning portion 1043 is pressed and deformed due to abutting against the second connecting plate 102 approaching the first connecting plate 101. When the second connecting plate 102 abuts against the first connecting plate 101, the third positioning portion 1043 elastically releases energy and is clipped into the groove. The fourth positioning portion 1044 is inserted into the second connecting plate 102 to limit the displacement of the second connecting plate 102 in the Z direction.

[0054] The spliced ​​ventilation duct described in this embodiment has a connection portion 104 disposed between two air duct plates 103, and the first positioning portion 1041 is plugged with the first matching portion 1013, and the second positioning portion 1042 is plugged with the second matching portion 1031. The connection portion 104 is used to connect and form multiple air duct plates 103 without relative movement, thereby avoiding the operation time of bolting various parts, and can quickly complete the assembly of parts, and the structure is simple and easy to implement. In addition, by providing a third positioning portion 1043 on the connection portion 104, the third positioning portion 1043 is connected with the groove, and the second connecting plate 102 of the next section is clamped, which can not only facilitate the positioning between the various pipeline splits 1, but also play a certain initial positioning effect, and when the two pipeline splits 1 are bolted, the problem of the air vents not being able to be aligned due to the gap between the screw hole and the bolt, or the processing error is avoided.

[0055] Based on the above overall concept, an exemplary structure of the spliced ​​ventilation duct of this embodiment is as follows: Figures 1 to 3As shown, two sections of ventilation ducts are used as an example for explanation. The Z direction in this embodiment is the extension direction of the ventilation duct, and the X direction and Y direction in this embodiment are the width direction and length direction of the ventilation duct.

[0056] like Figures 1 to 4 As shown, the first connecting plate 101 includes a first plate body 1012 and a first vent formed in the middle of the first plate body 1012, the second connecting plate 102 includes a second plate body 1021 and a second vent formed in the middle of the second plate body 1021, and the two ends of the air duct plate 103 are respectively abutted between the first plate body 1012 and the second plate body 1021. Each air duct plate 103 surrounds a duct, and the inner hole of the duct is equal to the inner hole of the first vent, and the inner hole of the duct is equal to the inner hole of the second vent.

[0057] Combination Figure 1 and Figure 4 As shown, the first plate body 1012 is formed into a rectangular planar plate structure, and the first vent is a rectangular through hole, so that the first plate body 1012 forms a circular rectangular plate. Similarly, the second plate body 1021 has the same structure as the first plate body 1012. The air duct plate 103 abuts between the first plate body 1012 and the second plate body 1021, which can limit the displacement of the air duct plate 103 in the Z direction. When the connecting part 104 connects the air duct plates 103 to form an air duct, the first plate body 1012 and the second plate body 1021 are buckled together, which can play a role in quick assembly.

[0058] Furthermore, if Figures 6 to 8 As shown, the connection part 104 includes a connection body 1045, and a fixing block 1046 fixedly connected to one end of the connection body 1045, the first positioning part 1041 is connected to one end of the fixing block 1046 close to the first connection plate 101; the third positioning part 1043 is arranged at the lower end of the first positioning part 1041, and the first positioning part 1041 and the third positioning part 1043 are both arranged on the fixing block 1046. Specifically, the fixing block 1046 and the connection body 1045 are processed separately, and then fixed as a whole by welding or screwing. It is easy to process and implement, and reduces the difficulty of processing. Of course, the fixing block 1046 and the connection body 1045 can also be cast as a whole,

[0059] As an exemplary embodiment, Figures 1 to 4 As shown, in this embodiment, the connecting body 1045 is "L" shaped, and the air duct plate 103 is "L" shaped. The two air duct plates 103 surround a rectangular air duct, the two connecting parts 104 are connected at opposite corners of the air duct plates 103, the outer side of the connecting body 1045 abuts against the inner wall of the air duct plate 103, and a plurality of second positioning parts 1042 are respectively provided on both sides of the connecting body 1045.

[0060] The air duct plate 103 is configured as an L-shaped plate to reduce the number of parts, and because two L-shaped air duct plates 103 are stacked together, the space occupied during transportation can be reduced. Of course, the air duct plate 103 can also be configured as a single flat plate, and four connecting parts 104 are provided at the four corners to connect the air duct.

[0061] As a specific example, Figures 1 to 4 As shown, the air duct of this embodiment is formed as a rectangular air duct. Of course, in the case of a circular air duct, the above-mentioned connecting body 1045 can be set to an arc shape, and two semicircles or multiple arcs are spliced ​​and fixed to achieve the purpose of simple and fast splicing.

[0062] Preferably, if Figure 1 , Figure 3 , Figure 4 As shown, the first plate 1012 and the second plate 1021 are provided with a limiting ring 105; the limiting ring 105 protrudes from the first plate 1012 and the second plate 1021 to the air duct plate 103, and the inner hole of the limiting ring 105 is adapted to the shape of the air duct; the inner hole of the limiting ring 105 is constructed around the outer side of the vent. In other embodiments, the limiting ring 105 can also be provided only on the first plate 1012 or the second plate 1021. The first plate 1012 or the second plate 1021 and the limiting ring 105 can be fixedly connected by stamping, welding, plugging, etc.

[0063] In this embodiment, the limiting ring 105 is provided on the first plate body 1012 and the second plate body 1021, which can further ensure that the air duct plate 103 is not dispersed. The provision of the second positioning portion 1042 also avoids the detachment of the connecting portion 104 and plays a role in strengthening the pipeline split 1.

[0064] As a specific implementation method, Figures 4 to 6 As shown, the first positioning portion 1041 of this embodiment is formed as a protrusion protruding toward the first plate body 1012, and the first matching portion 1013 is formed as a positioning groove 1011 provided on the first plate body 1012, and the opening end of the positioning groove 1011 faces the first vent. When the connecting portion 104 abuts against the inner wall of the air duct plate 103, the protrusion is inserted into the positioning groove 1011.

[0065] like Figure 6 As shown, the fixing block 1046 also includes a fixing plate, the upper end of which overlaps the inner side of the connecting body 1045 and is fixed by the above-mentioned connection method. The protrusion is a rectangular block, and the protrusion protrudes from the fixing plate to the positioning groove 1011 outside the inner hole of the air duct. Such a setting can improve the connection between the first connecting plate 101 and the air duct plate 103 to be tighter and prevent it from falling out.

[0066] like Figure 7As shown, in order to increase the fixation between the second connecting plate 102 and the connecting portion 104, the present embodiment further includes a fourth positioning portion 1044 at one end of the connecting portion 104 away from the first positioning portion 1041, and the fourth positioning portion 1044 is formed as a flange structure, a circular hole is provided on the air duct plate 103 for the fourth positioning portion 1044 to pass through, and a socket for inserting the fourth positioning portion 1044 is provided at a position corresponding to the fourth positioning portion 1044 on the limiting ring 105 of the second positioning plate.

[0067] like Figure 6 As shown, the third positioning portion 1043 is formed as a hook body inclined toward the first connecting plate 101, a groove is provided on the second plate 1021, and a clearance groove 1047 is provided on one end of the connecting portion 104 close to the groove. The clearance groove 1047 and the groove form a receiving groove for receiving the third positioning portion 1043. Figure 6 As shown in , the head of the hook body overlaps with the groove due to the proximity of the second plate body 1021.

[0068] Still Figure 6 As shown, in order to facilitate the rebound and release of energy of the hook body, in this embodiment, an inclined surface 1022 is set on the second plate body 1021, and the inclined direction of the inclined surface 1022 is the same as the inclined direction of the head of the hook body. When the second plate body 1021 is close to the first plate body 1012, the inclined surface 1022 first abuts against the inclined surface 1022 of the head of the hook body, so that the head of the hook body is bent and deformed toward the direction of the fixed plate. When the second plate body 1021 is attached to the first plate body 1012, the hook body is fixed by clamping with the groove, which plays a role in pre-positioning between two adjacent pipe split bodies 1. Preferably, the fixed plate of this embodiment is made of elastic steel.

[0069] like Figure 4 and Figure 7 As shown, the second positioning portion 1042 is formed as a flange protruding from the connecting body 1045, and one or more flanges are arranged at one end of the connecting body 1045 close to the fixing block 1046. The second matching portion 1031 is respectively connected to the joint of the two air duct plates 103, and the second matching portion 1031 is formed as a through hole adapted to the flange.

[0070] In order to facilitate plugging, the second positioning portion 1042 and the fourth positioning portion 1044 of this embodiment are provided with rounded corners. When the second connecting plate 102 and the second positioning portion 1042 are set as flanges and the second matching portion 1031 are set as through holes, it is not only conducive to processing needs, but also convenient for rapid assembly and has low requirements on operators.

[0071] Furthermore, if Figure 7 and Figure 8As shown, a guide groove 1048 is provided along the length of the connecting body 1045. The guide groove 1048 is a long groove opening toward one end of the air duct. By providing the guide groove 1048, the gas flow effect of the ventilation duct can be improved.

[0072] In addition, if Figure 1 and Figure 4 As shown, in this embodiment, the first connecting plate 101 and the second connecting plate 102 are provided with mounting holes 106. Bolts are passed through the mounting holes 106 to fix the first connecting plate 101 and the second connecting plate 102 with bolts, further increasing the fastening effect.

[0073] The spliced ​​ventilation duct of this embodiment can first insert each air duct plate 103 into the limiting ring 105 of the second connecting plate 102, and then push the two diagonal connecting parts 104 into the air duct plate 103 and the second connecting plate 102 to form a rectangular frame with one end open. Then, the first connecting plate 101 is connected to the other end of the air duct plate 103. At this time, it is necessary to manually move the fixing block 1046 to deform it. After the first connecting plate 101 is abutted in place, the fixing block 1046 is released, and the first positioning part 1041 is inserted into the positioning groove 1011 to realize the assembly of the duct split 1.

[0074] When the two pipe parts 1 are assembled, the first connecting plate 101 abuts against the second connecting plate 102, and the two pipe parts 1 are connected by the engagement of the third positioning portion 1043 with the groove, and the first vent and the second vent are aligned due to the two diagonal third positioning portions 1043.

[0075] The spliced ​​ventilation duct described in this embodiment has a connection portion 104 disposed between two air duct plates 103, and the first positioning portion 1041 is plugged with the first matching portion 1013, and the second positioning portion 1042 is plugged with the second matching portion 1031. The connection portion 104 connects and forms multiple air duct plates 103 without relative movement, thereby avoiding the operation time of bolting various parts, and can quickly complete the assembly of parts, and has a simple structure and is easy to implement. In addition, by providing a third positioning portion 1043 on the connection portion 104, the third positioning portion 1043 is connected with the groove, thereby avoiding the problem of the air vents not being able to be aligned due to the gap between the screw hole and the bolt, or the processing error.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A spliced ​​ventilation duct, characterized in that: It comprises a plurality of pipe segments (1) connected end to end; The duct body (1) comprises a first connecting plate (101) and a second connecting plate (102) arranged at intervals, a plurality of air duct plates (103) arranged between the first connecting plate (101) and the second connecting plate (102), and a connecting portion (104) connected between the inner walls of the two air duct plates (103); The connecting portion (104) is provided with a first positioning portion (1041) and a second positioning portion (1042); the first connecting plate (101) is provided with a first matching portion (1013) matched with the first positioning portion (1041); each of the air duct plates (103) is provided with a second matching portion (1031) matched with the second positioning portion (1042); The first connecting plate (101) and the second connecting plate (102) limit the displacement of the air duct plate (103) in the Z direction; the first positioning portion (1041) and the first matching portion (1013) are plug-connected to limit the displacement of the connecting portion (104) in the Z direction; the second positioning portion (1042) and the second matching portion (1031) are plug-connected to limit the displacement of the air duct plate (103) and the connecting portion (104) in the X direction and the Y direction; The connecting portion (104) is also provided with a third positioning portion (1043) and a fourth positioning portion (1044); the second connecting plate (102) is provided with a groove connected to the third positioning portion (1043); when the two pipe segments (1) are connected end to end, the third positioning portion (1043) is pressed and deformed due to abutting against the second connecting plate (102) and approaching the first connecting plate (101); when the second connecting plate (102) abuts against the first connecting plate (101), the third positioning portion (1043) elastically releases energy and is snapped into the groove; The fourth positioning portion (1044) is plugged into the second connecting plate (102) and is used to limit the displacement of the second connecting plate (102) in the Z direction.

2. The spliced ​​ventilation duct according to claim 1, characterized in that: The first connecting plate (101) comprises a first plate body (1012) and a first vent formed in the middle of the first plate body (1012); the second connecting plate (102) comprises a second plate body (1021) and a second vent formed in the middle of the second plate body (1021); and two ends of the air duct plate (103) are respectively abutted between the first plate body (1012) and the second plate body (1021); Each of the air duct plates (103) forms an air duct, and the inner hole of the air duct is equal to the inner hole of the first ventilating port, and the inner hole of the air duct is equal to the inner hole of the second ventilating port.

3. The spliced ​​ventilation duct according to claim 2 is characterized in that: The first plate body (1012) and / or the second plate body (1021) are provided with a limiting ring (105); The limiting ring (105) protrudes from the first plate body (1012) and / or the second plate body (1021) toward the air duct plate (103); the inner hole of the limiting ring (105) is adapted to the outer shape of the air duct plate (103); and the limiting ring (105) is constructed around the outer side of the air duct plate (103) along a circumference.

4. The spliced ​​ventilation duct according to claim 1, characterized in that: The connecting portion (104) comprises a connecting body (1045) and a fixing block (1046) fixedly connected to one end of the connecting body (1045). The first positioning portion (1041) is connected to one end of the fixing block (1046) close to the first connecting plate (101); The third positioning portion (1043) is arranged at the lower end of the first positioning portion (1041), and the first positioning portion (1041) and the third positioning portion (1043) are both arranged on the fixing block (1046).

5. The spliced ​​ventilation duct according to claim 2, characterized in that: The first positioning portion (1041) is formed as a protrusion protruding toward the first plate body (1012), and the first matching portion (1013) is formed as a positioning groove (1011) provided on the first plate body (1012), and the opening end of the positioning groove (1011) faces the first vent, and when the connecting portion (104) abuts against the inner wall of the air duct plate (103), the protrusion is inserted into the positioning groove (1011).

6. The spliced ​​ventilation duct according to claim 2, characterized in that: The third positioning portion (1043) is formed as a hook body inclined toward the first connecting plate (101), the groove is formed on the second plate body (1021), and a clearance groove (1047) is provided on one end of the connecting portion (104) close to the groove, and the clearance groove (1047) and the groove form a receiving groove for receiving the third positioning portion (1043).

7. The spliced ​​ventilation duct according to claim 4, characterized in that: The second positioning portion (1042) is formed as a flange protruding from the connecting body (1045), and one or more flanges are arranged at one end of the connecting body (1045) close to the fixing block (1046); The second matching portion (1031) is respectively arranged at the joint of the two air duct plates (103), and the second matching portion (1031) is formed as a through hole adapted to the flange.

8. The spliced ​​ventilation duct according to claim 4, characterized in that: The connecting body (1045) is in an "L" shape, and the air duct plate (103) is in an "L" shape; the two air duct plates (103) form a rectangular air duct. The two connecting parts (104) are connected to opposite diagonals of the air duct plate (103), the outer side of the connecting body (1045) abuts against the inner wall of the air duct plate (103), and a plurality of the second positioning parts (1042) are respectively provided on both sides of the connecting body (1045).

9. The spliced ​​ventilation duct according to claim 2, characterized in that: The inner side of the connecting body (1045) is provided with a guide groove (1048) arranged along its length, and the guide groove (1048) is a long groove opening toward one end of the air duct.

10. The spliced ​​ventilation duct according to claim 1, characterized in that: The first connecting plate (101) and the second connecting plate (102) are respectively provided with mounting holes (106).

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