Air pipe butt joint device in narrow space

Abstract

The utility model relates to the field of air duct butt joint equipment, in particular to an air duct butt joint device in a narrow space, which comprises a main arc plate, a secondary arc plate, an extension arc plate and a driving part, the section of the main arc plate is semicircular, a semicircular groove is arranged in the middle of the inner side surface of the main arc plate, and limit grooves are symmetrically arranged on two side walls of the semicircular groove. A T-shaped hole is formed in the inner side of one end, close to the end, of the limiting groove. A through hole is formed in the end, away from the T-shaped hole, of the main arc plate and close to the end. The secondary arc plate is slidably mounted in the semicircular groove, the section of the secondary arc plate is semicircular, the thickness of the secondary arc plate is equal to that of the semicircular groove, a placement groove is formed in the middle of the path direction of the outer side face of the secondary arc plate, a tooth block is mounted in the placement groove, and positioning grooves are symmetrically formed in the two side walls of the end, facing the through hole, of the secondary arc plate; according to the utility model, the air duct can be subjected to butt joint installation from the single side of the air duct, the installation is efficient, and the sealing performance is high.

Description

Technical Field

[0001] This utility model relates to the field of duct connection equipment, specifically a duct connection device for confined spaces. Background Technology

[0002] In modern architecture, industrial production, and various infrastructure constructions, the efficient operation of ventilation and air conditioning systems is crucial. As a key channel for air transport, the quality and efficiency of ductwork connections directly impact the performance of the entire system. In large commercial complexes and office buildings, ventilation systems regulate indoor air quality and temperature, ensuring a comfortable working and living environment for personnel. In industrial plants, ductwork bears the heavy responsibility of exhausting harmful gases and introducing fresh air, ensuring the safety and stability of production activities. Therefore, ductwork connection has become a core aspect of ventilation and air conditioning engineering.

[0003] Traditional duct connection devices can complete connection tasks relatively smoothly in regular, spacious spaces. However, they have certain drawbacks when faced with installation scenarios in confined spaces. Traditional connection devices are typically complex in structure and large in size. In confined spaces, limited operating space makes it difficult for installers to maneuver, significantly increasing installation difficulty and reducing efficiency. For example, in the renovation of some older buildings, the compact internal structure, such as a concave rectangular structure, leaves very little space for duct installation, making it difficult for traditional connection devices to be used properly. Moreover, traditional devices mostly require simultaneous installation from both sides of the duct, which is almost impossible in confined spaces, further limiting their application range. Utility Model Content

[0004] In view of the problems in the prior art, this utility model provides a duct connection device for confined spaces.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a duct docking device in a narrow space, including a main arc plate, a secondary arc plate, an extension arc plate and a driving component. The main arc plate has a semi-circular cross section. A semi-circular groove is provided in the center of the inner side of the main arc plate. Limiting grooves are symmetrically provided on both sides of the semi-circular groove. A T-shaped hole is provided on the inner side of one end of the limiting groove near the end. A through hole is provided on the end of the main arc plate away from the T-shaped hole and near its end.

[0006] The secondary arc plate is slidably installed in the semi-circular groove, and the cross-section of the secondary arc plate is semi-circular. The thickness of the secondary arc plate is the same as the thickness of the semi-circular groove. A placement groove is provided in the center along the path direction of the outer side of the secondary arc plate. A toothed block is installed in the placement groove. Positioning grooves are symmetrically provided on both sides of the secondary arc plate facing the through hole. A slider is provided in the center of the inner wall of the positioning groove.

[0007] The length of the extended arc plate is the same as that of the positioning groove. The side wall of the extended arc plate is provided with a sliding groove. The extended arc plate is installed in the positioning groove through the sliding groove and the slider. The outer surfaces of the extended arc plate and the secondary arc plate are flush. Positioning posts are welded at equal intervals along the setting path on both sides of the extended arc plate and the secondary arc plate, and the positioning posts are located in the limiting groove.

[0008] The driving component includes a first shaft frame symmetrically mounted on the outer wall of the main arc plate, a gear shaft mounted inside the first shaft frame and meshing with a gear block, a worm gear concentrically mounted on the gear shaft shaft, a worm gear fitted on the worm gear, the worm gear mounted on a second shaft frame, the second shaft frame fixedly mounted on the outer wall of the main arc plate, a protective cover mounted on the outside of the gear shaft and fixedly mounted on the outer wall of the main arc plate, an insertion hole on one side of the protective cover, a control rod concentrically fixedly connected to one end of the worm gear, the control rod being inserted into the insertion hole, and a sealing ring installed at the connection between the control rod and the insertion hole;

[0009] The end face of the positioning post located at the end of the extended arc plate has a threaded groove, and a locking bolt is installed in the T-hole.

[0010] Specifically, a sealing film is embedded in the end face of the main arc plate away from the driving component, and the thickness of the sealing film is no more than 2mm.

[0011] Specifically, the inner walls of the main arc plate, the secondary arc plate, and the extended arc plate are all bonded with sealing gaskets, and the thickness of the sealing gaskets at each location is equal.

[0012] Specifically, symmetrical covering grooves are provided on the sidewalls of the contact surfaces of the secondary arc plate and the extended arc plate, and elastic rubber sheets are bonded to the covering grooves.

[0013] Specifically, a threaded cylinder is fixedly installed on the outer wall of the protective cover at a position concentric with the control rod. A sealing sleeve is installed on the outer side of the threaded cylinder through threaded engagement, and a hexagonal block is provided at the center of the end face of the sealing sleeve.

[0014] Specifically, an O-ring is embedded on the inner side of the end of the locking bolt.

[0015] Specifically, the connection points of the main arc plate, the secondary arc plate, and the extended arc plate are coated with lubricating grease.

[0016] The beneficial effects of this utility model are:

[0017] This invention relates to a duct connection device for confined spaces. A threaded groove is provided on the end face of a positioning post located at the end of an extended arc plate. A locking bolt is installed within a T-shaped hole. When the arc plate extends to its maximum value, the worker holds the positioning post and moves the extended arc plate along the positioning groove until one end of the extended arc plate enters the semi-circular groove, and until the threaded groove coincides with the T-shaped hole. At this point, the locking bolt is inserted from the T-shaped hole and tightened into the threaded groove to complete the installation. This method allows the worker to complete the entire installation operation from only one side, making it easy and efficient for installation in confined spaces with compact building structures.

[0018] This invention relates to a duct connection device for confined spaces. When the extended arc plate enters the semi-circular groove, it first contacts the sealing film and then compresses the film to enter the groove together. The sealing film seals the connection between the extended arc plate and the semi-circular groove. Symmetrical covering grooves are provided on one side wall of the contact surface of both the secondary arc plate and the extended arc plate. An elastic rubber sheet is adhered within each covering groove. As the extended arc plate moves along the positioning groove, one end simultaneously stretches the elastic rubber sheet. The stretched elastic rubber sheet adheres tightly to the outer wall of the duct, effectively ensuring a tight seal during duct connection. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This utility model Figure 1 A magnified view of a portion of region A in the middle;

[0022] Figure 3 This is a schematic diagram of part of the structure of this utility model;

[0023] Figure 4 This utility model Figure 3 A magnified view of a portion of region B in the middle;

[0024] Figure 5 This utility model is being attempted to be installed.

[0025] In the diagram: 1. Main arc plate, 2. Secondary arc plate, 3. Extended arc plate, 4. Driving component, 5. Sealing film, 6. Elastic rubber sheet, 7. Sealing gasket, 11. Semicircular groove, 12. Limiting groove, 13. T-hole, 14. Through hole, 21. Placement groove, 22. Tooth block, 23. Positioning groove, 24. Slider, 25. Positioning post, 41. First shaft frame, 42. Gear shaft, 43. Worm gear, 44. Worm, 45. Second shaft frame, 46. Control rod, 47. Protective cover, 251. Threaded groove, 252. Covering groove, 471. Threaded cylinder, 472. Sealing sleeve, 473. Hexagonal block. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the user's or operator's intent or convention. Therefore, these terms are defined based on the entire contents of this specification.

[0028] See Figure 1-5 The present invention provides a duct connection device for confined spaces, comprising a main arc plate 1, a secondary arc plate 2, an extended arc plate 3, and a driving component 4. The inner wall diameters of the main arc plate 1, the secondary arc plate 2, and the extended arc plate 3 are equal, and the inner wall of the main arc plate 1, the secondary arc plate 2, and the extended arc plate 3 are all bonded with sealing gaskets 7, and the thickness of the sealing gaskets 7 at each position is equal.

[0029] The main arc plate 1 has a semi-circular cross section. A semi-circular groove 11 is provided in the center of the inner side of the main arc plate 1. Limiting grooves 12 are symmetrically provided on both sides of the semi-circular groove 11. A T-shaped hole 13 is provided on the inner side of one end of the limiting groove 12 near the end. A through hole 14 is provided on the end of the main arc plate 1 away from the T-shaped hole 13 and near its end.

[0030] The secondary arc plate 2 is slidably installed in the semi-circular groove 11, and the cross-section of the secondary arc plate 2 is semi-circular. Normally, the secondary arc plate 2 is retracted into the semi-circular groove 11.

[0031] The thickness of the secondary arc plate 2 is the same as the thickness of the semi-circular groove 11. A placement groove 21 is provided in the center along the path direction of the outer side of the secondary arc plate 2. A toothed block 22 is installed in the placement groove 21. Positioning grooves 23 are symmetrically provided on both sides of the secondary arc plate 2 facing the through hole 14. A slider 24 is provided in the center of the inner wall of the positioning groove 23.

[0032] The length of the extended arc plate 3 is the same as that of the positioning groove 23. The side wall of the extended arc plate 3 is provided with a sliding groove 31. The extended arc plate 3 is installed in the positioning groove 23 through the sliding groove 31 and the slider 24. The outer surfaces of the extended arc plate 3 and the secondary arc plate 2 are flush. Under normal conditions, the extended arc plate 3 is located in the positioning groove 23. It can be understood that the extended arc plate 3 is simultaneously located in the semi-circular groove 11. That is, the main arc plate 1, the secondary arc plate 2 and the extended arc plate 3 enter the work position in a semi-circular state when not installed.

[0033] Positioning posts 25 are welded at equal intervals along the set path on both sides of the extended arc plate 3 and the secondary arc plate 2. The positioning posts 25 are located in the limiting groove 12. The positions of the extended arc plate 3 and the secondary arc plate 2 are locked by the positioning posts 25 to prevent the extended arc plate 3 and the secondary arc plate 2 from falling out of the semi-circular groove 11. In specific operation, such as Figure 4 As shown in the construction diagram, with the end equipped with the drive component 4 facing away from the installation area, the construction personnel move the main arc plate 1 toward the outer wall of the duct until the sealing gasket 7 is in contact with the outer wall of the duct.

[0034] The driving component 4 includes a first shaft frame 41 symmetrically installed on the outer wall of the main arc plate 1, a gear shaft 42 installed inside the first shaft frame 41, and the gear shaft 42 meshing with the gear block 22. A worm gear 43 is concentrically installed on the shaft of the gear shaft 42, and a worm 44 is fitted on the worm gear 43. The worm 44 is installed on a second shaft frame 45, and the second shaft frame 45 is fixedly installed on the outer wall of the main arc plate 1.

[0035] A protective cover 47 is installed on the outside of the gear shaft 42, and the protective cover 47 is fixedly installed on the outer wall of the main arc plate 1. An insertion hole is opened on one side of the protective cover 47. A control rod 46 is concentrically fixedly connected to one end of the worm gear 44, and the control rod 46 is inserted into the insertion hole. A sealing ring is installed at the connection between the control rod 46 and the insertion hole. In specific operation, after the sealing gasket 7 is attached to the outer wall of the air duct, the construction personnel drive the control rod 46 to rotate with a wrench. The rotated control rod 46 drives the worm gear 44 to rotate. The worm gear 44 and the worm wheel 43 cooperate with each other to drive the gear shaft 42 to rotate on the first shaft frame 41. The rotating gear shaft 42 gradually meshes with the tooth block 22, thereby driving the secondary arc plate 2 to extend along the semi-circular groove 11. The secondary arc plate 2 gradually covers the outer circumference of the air duct.

[0036] The end face of the positioning post 25 located at the end of the extended arc plate 3 is provided with a threaded groove 251. A locking bolt 15 is installed in the T-hole 13. When the secondary arc plate 2 extends to its maximum value, the construction worker holds the positioning post 25 and moves the extended arc plate 3 along the positioning groove 23 until one end of the extended arc plate 3 enters the semi-circular groove 11 and until the threaded groove 251 coincides with the T-hole 13. At this time, the locking bolt 15 is inserted from the T-hole 13 and tightened into the threaded groove 251 to complete the installation. In this way, the construction worker only needs to complete the entire installation work from one side. For the compact and narrow working environment inside the building, the installation difficulty is small and the installation efficiency is high.

[0037] Meanwhile, the worm gear 44 and worm wheel 43 have a self-locking effect, which makes the positions of the main arc plate 1, the secondary arc plate 2 and the extended arc plate 3 more stable after they are fixed and less prone to loosening; an O-ring is embedded in the inner side of the end of the locking bolt 15, that is, when the locking bolt 15 is tightened into the T-hole 13, the O-ring is pressed tightly against the end face of the T-hole 13.

[0038] In another embodiment, see Figures 1-5 The end face of the main arc plate 1 facing away from the driving component 4 is embedded with a sealing film 5. During installation, when the extension arc plate 3 enters the semi-circular groove 11, it first contacts the sealing film 5 and squeezes the sealing film 5 into the semi-circular groove 11 together. The sealing film 5 seals the connection between the extension arc plate 3 and the semi-circular groove 11 to ensure the sealing performance when the air duct is connected. The thickness of the sealing film 5 is no more than 2mm. The sealing film 5 of this size is not easily damaged when it is deformed.

[0039] At the same time, such as Figures 1-5 As shown, symmetrical covering grooves 252 are provided on the sidewalls of the contact surfaces of the secondary arc plate 2 and the extended arc plate 3. An elastic rubber sheet 6 is bonded in the covering groove 252. When the extended arc plate 3 moves along the positioning groove 23, one end of it will simultaneously drive the elastic rubber sheet 6 to stretch. The stretched elastic rubber sheet 6 will be tightly attached to the outer wall of the air duct, thereby further increasing the sealing performance of this utility model.

[0040] In another embodiment, see 3 and Figure 4 A threaded cylinder 471 is fixedly installed on the outer wall of the protective cover 47 at a position concentric with the control rod 46. A sealing sleeve 472 is installed on the outer side of the threaded cylinder 471 through threaded engagement. A hexagonal block 473 is provided at the center of the end face of the sealing sleeve 472. Construction personnel can use a wrench to engage with the hexagonal block 473 to tighten the sealing sleeve 472 to the outer side of the threaded cylinder 471. The sealing sleeve 472 provides a secondary seal for one end of the control rod 46, reducing the risk of air leakage at the connection between the control rod 46 and the protective cover 47.

[0041] The connection between the main arc plate 1, the secondary arc plate 2, and the extended arc plate 3 is coated with lubricating grease, which reduces wear between the three when they move relative to each other. The lubricating grease can also form an oil film of a certain thickness, which can further improve the sealing of the connection between the main arc plate 1, the secondary arc plate 2, and the extended arc plate 3.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A duct connection device for confined spaces, characterized in that, include: The main arc plate (1) has a semi-circular cross section. A semi-circular groove (11) is provided in the center of the inner side of the main arc plate (1). Limiting grooves (12) are symmetrically provided on both sides of the semi-circular groove (11). A T-shaped hole (13) is provided on the inner side of one end of the limiting groove (12) near the end. A through hole (14) is provided on the end of the main arc plate (1) away from the T-shaped hole (13) and near its end. The secondary arc plate (2) is slidably installed in the semi-circular groove (11), and the cross section of the secondary arc plate (2) is semi-circular. The thickness of the secondary arc plate (2) is the same as the thickness of the semi-circular groove (11). A placement groove (21) is provided in the center along the path direction of the outer side of the secondary arc plate (2). A toothed block (22) is installed in the placement groove (21). A positioning groove (23) is symmetrically provided on both sides of the secondary arc plate (2) facing the through hole (14). A slider (24) is provided in the center of the inner wall of the positioning groove (23). The extension arc plate (3) has a length equal to that of the positioning groove (23). The side wall of the extension arc plate (3) is provided with a sliding groove (31). The extension arc plate (3) is installed in the positioning groove (23) through the sliding groove (31) and the slider (24). The outer surfaces of the extension arc plate (3) and the secondary arc plate (2) are flush. Positioning posts (25) are welded at equal intervals along the setting path on both sides of the extension arc plate (3) and the secondary arc plate (2). The positioning posts (25) are located in the limiting groove (12). The driving component (4) includes a first shaft frame (41) symmetrically installed on the outer wall of the main arc plate (1), a gear shaft (42) is installed inside the first shaft frame (41), and the gear shaft (42) meshes with the gear block (22). A worm wheel (43) is concentrically installed on the shaft of the gear shaft (42), and a worm (44) is fitted on the worm wheel (43). The worm (44) is installed on the second shaft frame (45), and the second shaft frame (45) is fixedly installed on the outer wall of the main arc plate (1). A protective cover (47) is installed on the outside of the gear shaft (42), and the protective cover (47) is fixedly installed on the outer wall of the main arc plate (1). An insertion hole is opened on one side of the protective cover (47). A control rod (46) is concentrically fixedly connected to one end of the worm (44), and the control rod (46) is inserted into the insertion hole. A sealing ring is installed at the connection between the control rod (46) and the insertion hole. The end face of the positioning post (25) located at the end of the extended arc plate (3) has a threaded groove (251), and a locking bolt (15) is installed in the T-hole (13).

2. The duct connection device for a confined space according to claim 1, characterized in that: A sealing film (5) is embedded in one end face of the main arc plate (1) away from the driving component (4), and the thickness of the sealing film (5) is no more than 2mm.

3. The duct connection device for a confined space according to claim 1, characterized in that: The inner walls of the main arc plate (1), the secondary arc plate (2) and the extended arc plate (3) are all bonded with sealing gaskets (7), and the thickness of the sealing gaskets (7) at each position is the same.

4. The duct connection device for a confined space according to claim 1, characterized in that: A cover groove (252) is symmetrically provided on one side wall of the contact surface of the secondary arc plate (2) and the extended arc plate (3), and an elastic rubber sheet (6) is bonded in the cover groove (252).

5. A duct connection device for confined spaces according to claim 1, characterized in that: The outer wall of the protective cover (47) is fixedly installed with a threaded cylinder (471) at a position concentric with the control rod (46). A sealing sleeve (472) is installed on the outer side of the threaded cylinder (471) through threaded engagement. A hexagonal block (473) is provided at the center of the end face of the sealing sleeve (472).

6. The duct connection device for a confined space according to claim 1, characterized in that: An O-ring is embedded on the inner side of the end of the locking bolt (15).

7. A duct connection device for confined spaces according to claim 1, characterized in that: The connection points of the main arc plate (1), the secondary arc plate (2) and the extension arc plate (3) are coated with lubricating grease.

Images