Ventilation tube connection safety device for confined space operations

Abstract

The utility model belongs to the technical field of ventilation pipe connection, specifically provides a ventilation pipe joint safety device of limited space operation, including a connecting pipe and two card holders, the both ends of connecting pipe are opened with the accommodation groove for accommodating the end of ventilation pipe respectively, the outer wall of connecting pipe is separated into a plurality of clamping parts through a plurality of openings, and the clamping part can be radially held to the end of ventilation pipe by using the card holder to make it inwardly gather. The design is suitable for the connection of most flexible corrugated pipes without special structure in the market, has strong versatility, can realize quick and reliable connection without designing flange or annular support part and other special structures at the end of ventilation pipe, has simple structure, is convenient to install, and can effectively prevent the connection from loosening or leaking under ventilation pressure, helps to improve the safety and reliability of forced ventilation in limited space operation.

Description

Technical Field

[0001] This application belongs to the field of ventilation duct connection technology, specifically a safety device for ventilation duct joints used in confined space operations. Background Technology

[0002] Confined space work involves construction or equipment maintenance in basements, residential drainage pipes, and factory underground passages. Because confined spaces are often unventilated for extended periods, they may contain toxic or harmful gases. To improve safety, forced ventilation is an essential and critical step in confined space work safety regulations before personnel can enter.

[0003] Forced ventilation relies on a blower and ventilation ducts. The blower is placed externally, and the ventilation ducts connect to it, supplying fresh air to the confined space, replacing the stale air inside. Personnel can only enter after a period of forced ventilation, and the blower must remain running throughout the operation. The ventilation ducts used in confined space operations are typically flexible corrugated pipes. When the confined space is far from the blower, multiple ventilation ducts need to be connected together using joints. Reliable duct connections are the technical foundation for preventing the leakage of toxic and harmful gases and ensuring life safety.

[0004] Common corrugated pipe connection methods include clamps or flanges. Since ventilation corrugated pipes are typically flexible corrugated pipes made of PE or PVC, flange connections require flanges at the pipe ends, with multiple bolts and nuts used to fasten the two pipe sections together. Clamp connections require rigid annular supports at the corrugated pipe ends to support the clamps. Both of these connection methods for flexible corrugated pipes have specific structural requirements for the pipe ends, making them unsuitable for ordinary corrugated pipes and lacking versatility. Furthermore, damaged corrugated pipes are difficult to replace when replacement parts are unavailable. Utility Model Content

[0005] Based on the above-mentioned technical problems, this application provides a safety device for ventilation pipe joints in confined space operations, in order to solve the technical problem that the connection structure of ventilation pipes in the prior art has special requirements for the structure of the ventilation pipe end and poor versatility.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a safety device for ventilation pipe joints in confined space operations, comprising:

[0007] A connecting tube, wherein each end of the connecting tube has an annular receiving groove, and the outer wall of the receiving groove has multiple notches spaced apart along its circumference. The notches penetrate the outer wall of the receiving groove and extend to the end face of the connecting tube to form a port. The multiple notches divide the end of the connecting tube into multiple clamping portions; and

[0008] Two clamping members are respectively located at both ends of the connecting tube, and are used to apply an inward clamping force to the clamping part.

[0009] In one possible implementation, the wall thickness of the inner sidewall of the receiving groove is greater than the wall thickness of the outer sidewall of the receiving groove.

[0010] In one possible implementation, an arc-shaped slot is provided at the end of the notch away from the end of the connecting pipe, and the diameter of the slot is larger than the width of the notch.

[0011] In one possible implementation, the clamping element is an annular tube clamp sleeved on the outside of the clamping part.

[0012] In one possible implementation, the connecting tube has external threads on the sides of the two clamping portions adjacent to each other; the clamping member includes:

[0013] The connecting section is annular and sleeved on the outer circumference of the connecting pipe, and the connecting section is threadedly engaged with the external thread of the connecting pipe;

[0014] An extrusion section is provided on the side of the connecting section adjacent to the end of the connecting pipe. The inner hole of the extrusion section is a tapered surface that abuts against the clamping part. The inner diameter of the extrusion section gradually decreases in the direction toward the end of the connecting pipe.

[0015] In one possible implementation, the outer periphery of the connecting segment is provided with multiple anti-slip protrusions along the circumferential direction.

[0016] In one possible implementation, the clamping portion is further provided with a flexible material layer on the side adjacent to the receiving groove.

[0017] In one possible implementation, the depth of the receiving groove is 10-50 mm.

[0018] In one possible implementation, the inner wall of the receiving groove is provided with an annular sealing groove, and a sealing ring is provided in the sealing groove.

[0019] In one possible implementation, multiple sealing grooves are provided at intervals along the axial direction of the connecting pipe, and each sealing groove is provided with a sealing ring.

[0020] Compared with the prior art, the beneficial effects of the ventilation pipe joint safety device for confined space operations provided in this application are:

[0021] The safety device for ventilation pipe joints in confined space operations provided in this application includes a connecting pipe and two clamping members. The two ends of the connecting pipe are respectively provided with receiving grooves for accommodating the ends of the ventilation pipe. The outer wall of the connecting pipe is divided into multiple clamping parts by multiple notches, and the clamping members are used to bring them together inward so that the clamping parts can radially clamp the ends of the ventilation pipe.

[0022] From the perspective of product versatility, this design is suitable for connecting most flexible corrugated pipes on the market that do not have special end structures. It achieves quick and reliable connections without requiring special structures such as flanges or annular supports at the ends of the ventilation pipe, demonstrating strong versatility. Regarding ease of installation, the ventilation pipe is clamped using clips, making installation simple and convenient. In terms of the connection effect, the clamps apply radial clamping force to the ventilation pipe, achieving a seal under this force. This effectively prevents loosening or leakage at the connection point under ventilation pressure, contributing to improved safety and reliability of forced ventilation in confined space operations. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 An exploded view of the assembly of the ventilation pipe joint safety device for confined space operations provided in Embodiment 1 of this application;

[0025] Figure 2 A diagram illustrating the usage status of the ventilation duct joint safety device for confined space operations provided in Embodiment 1 of this application;

[0026] Figure 3 This is an exploded assembly diagram of the ventilation pipe joint safety device for confined space operations provided in Embodiment 2 of this application;

[0027] Figure 4 An internal sectional view of the ventilation pipe joint safety device for confined space operations provided in Embodiment 2 of this application;

[0028] Figure 5 A diagram illustrating the usage status of the ventilation duct joint safety device for confined space operations provided in Embodiment 2 of this application;

[0029] Explanation of reference numerals in the attached figures:

[0030] 10. Connecting pipe; 11. Receiving groove; 12. Notch; 121. Slot; 13. Clamping part; 14. Sealing ring; 20. Holding part; 21. Connecting section; 211. Anti-slip protrusion; 22. Extrusion section. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0036] Please refer to the following: Figures 1 to 5 The following describes the safety device for ventilation pipe joints in confined space operations provided in the embodiments of this application.

[0037] Example 1:

[0038] like Figure 1 and Figure 2As shown, a safety device for a ventilation pipe joint in confined space operations includes a connecting pipe 10 and clamping members 20. Both ends of the connecting pipe 10 are provided with annular receiving grooves 11. The outer wall of the connecting pipe 10 near its end is provided with multiple notches 12 spaced apart along its circumference. The notches 12 penetrate the end of the connecting pipe 10 along its axial direction and communicate with the receiving grooves 11. The multiple notches 12 divide the end of the connecting pipe 10 into multiple clamping portions 13. Two clamping members 20 are respectively provided at both ends of the connecting pipe 10 to apply an inward clamping force to the clamping portions 13.

[0039] Compared with the prior art, the beneficial effects of the ventilation pipe joint safety device for confined space operations provided in Embodiment 1 of this application are:

[0040] The ventilation pipe joint safety device for confined space operations provided in Embodiment 1 of this application includes a connecting pipe 10 and two clamping members 20. The two ends of the connecting pipe 10 are respectively provided with receiving grooves 11 for accommodating the end of the ventilation pipe. The outer wall of the connecting pipe 10 is divided into multiple clamping parts 13 by multiple notches 12, and the clamping members 20 are used to bring them together inward, so that the clamping parts 13 can radially clamp the end of the ventilation pipe. The inner wall of the receiving groove 11 can support the flexible ventilation pipe.

[0041] From the perspective of product versatility, this design is suitable for connecting most flexible corrugated pipes on the market that do not have special end structures. It achieves quick and reliable connections without requiring flanges or rigid annular supports at the ventilation pipe ends, demonstrating strong versatility. Regarding ease of installation, the clamping mechanism provides radial clamping during ventilation pipe connection, making installation simple and convenient. In terms of the connection effect, the clamping mechanism applies radial clamping force to the ventilation pipe, achieving a seal under this force. This effectively prevents loosening or leakage at the connection point under ventilation pressure, contributing to improved safety and reliability of forced ventilation in confined space operations.

[0042] The connecting pipe 10 is a hollow circular tube with annular receiving grooves 11 at both ends for inserting the end of the flexible corrugated ventilation duct. The size of the receiving grooves 11 corresponds to the end size of the ventilation duct, ensuring that the ventilation duct can be inserted smoothly without large gaps. Multiple notches 12 (e.g., 4-8) are evenly distributed along the circumference of the outer wall of the connecting pipe 10 near the end. The notches 12 penetrate the end axially and communicate with the receiving grooves 11, thereby dividing the end into multiple independent clamping portions 13. The clamping portions 13 have elastic deformation capabilities and can converge inward under external force; the specific elastic modulus of the material is not limited. Two clamping members 20 are installed at both ends of the connecting pipe 10 to apply radial pressure to the clamping portions 13, causing them to clamp the ventilation duct.

[0043] The connecting pipe 10 can be made of metal (such as stainless steel or aluminum alloy) or engineering plastic (such as ABS or PVC), with sufficient strength and corrosion resistance, and can undergo elastic deformation under certain pressure; the clamping part 20 can be made of metal or plastic depending on the application scenario, and the clamping part 20 can be selected with a ring clamp of appropriate size.

[0044] The ventilation duct joint safety device provided in Embodiment 1 of this application is highly versatile and applicable to flexible corrugated pipes of various materials and specifications (such as corrugated pipes with diameters of 50-200mm). It eliminates the need for special butt joint structures at the ends of the corrugated pipes, making it widely applicable and highly versatile. It utilizes detachable pipe clamps for secure fixing, ensuring convenient use, reliable connection, and preventing the ventilation duct from falling off.

[0045] Understandably, the diameters of the connecting pipe 10 and the clamping member 20 should be compatible with the diameter of the ventilation pipe to be connected. The number of notches 12 can be adjusted according to the diameter of the connecting pipe 10 (for example, 4 notches 12 for small-diameter pipes and 6 or more for large-diameter pipes) to ensure uniform clamping force. During installation, first insert the end of the ventilation pipe into the receiving groove 11 to a certain depth, and then use the clamping member 20 to tighten the clamping part 13.

[0046] Please see Figure 1 The wall thickness between the inner wall of the receiving groove 11 and the inner hole of the connecting pipe 10 (e.g., 3-5 mm) is greater than the wall thickness between the outer wall of the receiving groove 11 and the outer wall of the connecting pipe 10 (e.g., 1-2 mm). This asymmetrical wall thickness design makes the clamping part 13 easier to bend inward. The groove depth of the receiving groove 11 is 10-50 mm, just enough to ensure sufficient contact length after the ventilation pipe is inserted.

[0047] The connecting pipe 10 can be made of high-strength materials, such as die-cast aluminum alloy or engineering plastics, to ensure that the thick inner wall of the receiving groove 11 can withstand internal pressure, while the thin outer wall provides radial clamping force through the clamping member 20. Since pipe clamps are mostly made of metal and are relatively thin, their edges are prone to forming sharp cutting edges. The clamping part 13 replaces the pipe clamp in contact with the ventilation pipe and also plays a protective role, preventing the pipe clamp from directly contacting the ventilation pipe and causing scratches or peeling on the outer surface of the ventilation pipe.

[0048] Please see Figure 1 An arc-shaped slot 121 is provided at the end of the notch 12 furthest from the end of the connecting pipe 10. The diameter of the slot 121 is larger than the width of the notch 12, and the slot 121 and the notch 12 are smoothly connected to avoid sharp corners. The design of the slot 121 can effectively disperse the stress at the root of the notch 12, prevent cracks from being generated and propagating, and extend the service life of the connecting pipe 10. The arc design makes the bending of the clamping part 13 smoother.

[0049] The clamping component 20 is an annular pipe clamp fitted onto the outside of the clamping part 13. It is easy to install; simply put it on and tighten it. The pipe clamp provides a uniform circumferential clamping force, ensuring that the ventilation pipe is firmly clamped, meeting the needs of rapid installation and disassembly in confined space operations.

[0050] A flexible material layer is also provided on the side of the clamping part 13 adjacent to the receiving groove 11. This layer can be fixed by bonding, embedding, or covering. The flexible material layer is 1-3mm thick, covering the entire inner side of the clamping part 13, which can improve the friction between the clamping part and the ventilation duct and prevent the outer surface of the ventilation duct from being crushed or scratched. The flexible material can be rubber (nitrile rubber), silicone, or polyurethane, and has a high coefficient of friction and elasticity.

[0051] The inner wall of the receiving groove 11 is provided with an annular sealing groove, and a sealing ring 14 is provided in the sealing groove. Multiple sealing grooves are provided at intervals along the axial direction of the connecting pipe 10, and a sealing ring 14 is provided in each sealing groove. Multiple sealing rings 14 form a multiple sealing barrier.

[0052] The sealing groove has a rectangular or semi-circular cross-section and a depth of 1-2 mm. A sealing ring 14 (such as an O-ring) is installed inside the sealing groove. When compressed, the sealing ring 14 fills the gap between the connecting pipe 10 and the ventilation pipe, effectively sealing the connection.

[0053] The sealing ring 14 can be made of elastic sealing materials, such as nitrile rubber, silicone or fluororubber, which are resistant to aging and have a wide applicable temperature range.

[0054] Example 2:

[0055] Please see Figure 3 , Figure 4 and Figure 5 Based on the connecting pipe 10 in Embodiment 1 above, the connecting pipe 10 has external threads on the sides of the two clamping parts 13 adjacent to each other; the clamping member 20 includes an integrally formed connecting section 21 and a pressing section 22. The connecting section 21 is annular and sleeved on the outer periphery of the connecting pipe 10, and the connecting section 21 is threadedly engaged with the external threads of the connecting pipe 10; the pressing section 22 is located on the side of the connecting section 21 adjacent to the end of the connecting pipe 10, and the inner hole of the pressing section 22 is a tapered surface (taper angle 15-30 degrees) that abuts against the clamping part 13, and the inner diameter of the pressing section 22 gradually decreases in the direction towards the end of the connecting pipe 10. When the connecting section 21 is rotated, the pressing section 22 moves axially, and the tapered surface presses the clamping part 13 inward, pressing the ventilation pipe. The connecting section 21 and the pressing section 22 can be integrally formed and made of metal or plastic.

[0056] The outer periphery of the connecting section 21 is provided with multiple anti-slip protrusions 211 along the circumferential direction. The protrusions can be knurled, raised, or striped to increase the friction when manually tightening.

[0057] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present utility model specification has recorded each combined embodiment and can support different combined embodiments.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A safety device for ventilation pipe joints in confined space operations, characterized in that, include: A connecting pipe (10) has annular receiving grooves (11) at both ends. Multiple notches (12) are spaced along the circumference of the outer wall of each receiving groove (11). Each notch (12) penetrates the outer wall of the receiving groove (11) and extends to the end face of the connecting pipe (10) to form a break. The multiple notches (12) divide the end of the connecting pipe (10) into multiple clamping portions (13). Two clamping members (20) are respectively disposed at both ends of the connecting tube (10) for applying an inward clamping force to the clamping part (13).

2. The safety device for ventilation pipe joints in confined space operations according to claim 1, characterized in that, The wall thickness of the inner sidewall of the receiving groove (11) is greater than the wall thickness of the outer sidewall of the receiving groove (11).

3. The safety device for ventilation pipe joints in confined space operations according to claim 1, characterized in that, The notch (12) has an arc-shaped slot (121) at one end away from the end of the connecting pipe (10), and the diameter of the slot (121) is larger than the width of the notch (12).

4. The safety device for ventilation pipe joints in confined space operations according to claim 1, characterized in that, The clamping member (20) is a ring-shaped pipe clamp sleeved on the outside of the clamping part (13).

5. The safety device for ventilation pipe joints in confined space operations according to claim 1, characterized in that, The connecting tube (10) has external threads on the side of each of the two clamping parts (13) that are adjacent to each other; the retaining member (20) includes: A connecting segment (21), which is annular and sleeved on the outer periphery of the connecting pipe (10), is threadedly engaged with the external thread of the connecting pipe (10); and The extrusion section (22) is located on the side of the connecting section (21) adjacent to the end of the connecting pipe (10). The inner hole of the extrusion section (22) is a tapered surface that abuts against the clamping part (13). The inner diameter of the extrusion section (22) gradually decreases in the direction toward the end of the connecting pipe (10).

6. The safety device for ventilation pipe joints in confined space operations according to claim 5, characterized in that, The outer periphery of the connecting section (21) is provided with multiple anti-slip protrusions (211) along the circumferential direction.

7. The safety device for ventilation pipe joints in confined space operations according to claim 1, characterized in that, The clamping part (13) is also provided with a flexible material layer on the side adjacent to the receiving groove (11).

8. The safety device for ventilation pipe joints in confined space operations according to claim 1, characterized in that, The depth of the receiving groove (11) is 10-50mm.

9. The safety device for ventilation pipe joints in confined space operations according to claim 1, characterized in that, The inner wall of the receiving groove (11) is provided with an annular sealing groove, and a sealing ring (14) is provided in the sealing groove.

10. The safety device for ventilation pipe joints in confined space operations according to claim 9, characterized in that, The sealing grooves are provided at intervals along the axial direction of the connecting pipe (10), and each sealing groove is provided with a sealing ring (14).

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