Fabricated low-specific-friction low-air-leakage ventilating duct

Abstract

The utility model discloses an assembly type low-specific-friction low-air-leakage ventilation pipeline, and relates to the technical field of ventilation air pipes. The utility model comprises pipe joints which are spliced end to end; the pipe joint comprises an outer shell and an inner shell which are coaxially arranged in a sleeved mode, and the inner wall of the outer shell is attached to the outer wall of the inner shell. A first annular groove surrounding the axis of the outer shell is formed in the middle section of the inner wall of the outer shell, second annular grooves surrounding the axis of the outer shell are formed in the two ends of the inner wall of the outer shell, and one side of each second annular groove penetrates through the end of the outer shell. A cooling filling cavity is formed between the outer wall of the inner shell and the first annular groove in a surrounding mode, the outer wall of the inner shell and the two second annular grooves form a first sealing filling cavity and a second sealing filling cavity respectively, and the first sealing filling cavity and the second sealing filling cavity of the other pipe joint are spliced to form a sealing cavity. The purposes that the air pipe can be conveniently assembled, the sealing performance is excellent, and meanwhile the air pipe has low specific friction resistance and good flame retardant performance are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation ducts, in particular to an assembled ventilation duct with low specific friction resistance and low air leakage. Background Art

[0002] Building ventilation ducts are generally divided into two categories according to their functions: smoke exhaust ducts and smoke-proof ducts. The function of smoke exhaust ducts is to discharge fire smoke in rooms, corridors and other spaces outside the building. The function of smoke-proof ducts is to prevent fire smoke from invading escape places such as stairwells, antechambers, and refuge floors (rooms).

[0003] The fire resistance limit of fireproof walls in first-class buildings is usually 3.0h. Sometimes, due to objective reasons, air ducts inevitably have to pass through fireproof walls. Air ducts with a fire resistance limit of less than 3.0h will become channels for smoke to spread. In buildings with high cleanliness requirements, not only the fire resistance performance of ventilation ducts is required, but also the operating resistance and air leakage of the ducts are required. Therefore, developing an assembled ventilation duct with better friction resistance and air leakage than the technical requirements of JG / T 258-2009 and a fire resistance limit of 3.0h has certain economic and social benefits. Utility Model Content

[0004] The purpose of the utility model is to provide an assembled low-specific friction resistance and low-leakage ventilation duct, so that the air duct can be easily assembled and has excellent sealing performance, while having low specific friction resistance and good flame retardant performance.

[0005] In order to achieve the above purpose, the utility model adopts the following technical means:

[0006] An assembled low-specific friction and low-leakage ventilation duct comprises pipe sections that are spliced ​​end to end.

[0007] The pipe joint comprises an outer shell and an inner shell which are coaxially sleeved, and the inner wall of the outer shell is fitted with the outer wall of the inner shell;

[0008] A first annular groove is formed in the middle section of the inner wall of the outer shell and is arranged around its axis. Second annular grooves are formed at both ends of the inner wall of the outer shell and are arranged around its axis. One side of the second annular groove passes through the end of the outer shell.

[0009] A cooling filling cavity is formed between the outer wall of the inner shell and the first annular groove. The outer wall of the inner shell and the two second annular grooves respectively form a first sealing filling cavity and a second sealing filling cavity. The first sealing filling cavity is spliced ​​with the second sealing filling cavity of another pipe segment to form a sealed cavity.

[0010] The outer shell is provided with a first feeding mechanism communicating with the cooling filling cavity. The outer shell is also provided with a first pipeline communicating with the first sealing filling cavity and a second pipeline communicating with the second sealing filling cavity.

[0011] Preferably, the first feeding mechanism includes a feeding pipe and an exhaust pipe connected to the cooling filling cavity, and the feeding pipe and the exhaust pipe are symmetrically arranged on the upper and lower sides of the outer shell.

[0012] Furthermore, both the material delivery pipe and the air extraction pipe are equipped with a blocking cover.

[0013] Furthermore, a connecting ring plate is constructed in the first sealed filling cavity, the inner wall of the connecting ring plate is in contact with the inner wall of the first sealed filling cavity, and one end of the connecting ring plate extends out of the first sealed filling cavity.

[0014] Furthermore, two adjacent pipe sections are connected by bolts, and the bolts pass through the outer shell of one pipe section and the connecting ring plate of the other pipe section at the same time, and one end of the bolts extends into the sealing cavity.

[0015] Furthermore, the inner shell includes a steel pipe fitted with the inner wall of the outer shell, and the inner wall of the steel pipe is covered with a flame retardant layer.

[0016] Furthermore, the steel pipes in two adjacent pipe sections abut against each other, and the flame retardant layers in two adjacent pipe sections abut against each other.

[0017] During use, the utility model has the following beneficial effects:

[0018] By joining the pipe sections end to end, the entire air duct can be formed by mutual assembly, which facilitates the configuration and arrangement of the ventilation duct. At the same time, the first annular groove and the second annular groove provided on the inner wall of the outer shell are used to form a cooling filling cavity, a first sealed filling cavity, and a second sealed filling cavity with the inner shell, respectively. When the entire ventilation duct is assembled, a cooling filling cavity and a first sealed filling cavity and a second sealed filling cavity can be formed between the outer shell and the inner shell. Thermally conductive epoxy resin is pumped into the cooling filling cavity through the first feeding mechanism, and the entire cooling filling cavity is completely filled with the thermally conductive epoxy resin. The provision of the thermally conductive epoxy resin can not only improve the thermal conductivity of the entire pipe section and its fire resistance, but also can utilize the contact between the thermally conductive epoxy resin and the outer wall of the inner shell to bond the outer shell and the inner shell, making the assembly of the two more stable. Furthermore, thermal expansion packing can be filled into the sealed cavity through the first or second pipeline. In this way, in the event of a fire, when the ambient temperature rises significantly, the thermal expansion of the thermal expansion packing can completely fill the gap between adjacent pipe sections, thereby improving the seal in a fire environment and preventing air leakage. Low specific friction resistance can be achieved by applying a smooth fire-resistant coating to the inner wall of the inner shell to reduce the friction coefficient of the inner shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the splicing structure of two pipe sections of the utility model.

[0020] Figure 2 for Figure 1 Schematic diagram of the cross-section structure.

[0021] Among them, 100-pipe joint, 200-outer shell, 300-inner shell, 400-first annular groove, 500-second annular groove, 600-first sealed filling chamber, 700-second sealed filling chamber, 800-sealed chamber, 900-first pipeline, 1000-second pipeline, 1100-feeding pipe, 1200-exhaust pipe, 1300-connecting ring plate, 1400-bolt. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] 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.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0026] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the present invention is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] Please refer to Figure 1 and Figure 2 As shown, an assembled low-specific friction and low-leakage ventilation duct includes pipe sections 100 that are spliced ​​end to end.

[0029] The pipe joint 100 includes an outer shell 200 and an inner shell 300 that are coaxially sleeved, and the inner wall of the outer shell 200 is arranged in contact with the outer wall of the inner shell 300;

[0030] A first annular groove 400 is formed in the middle section of the inner wall of the outer shell 200 and is arranged around its axis. Second annular grooves 500 are formed at both ends of the inner wall of the outer shell 200 and are arranged around its axis. One side of the second annular groove 500 passes through the end of the outer shell 200.

[0031] A cooling filling cavity is formed between the outer wall of the inner shell 300 and the first annular groove 400. The outer wall of the inner shell 300 and the two second annular grooves 500 respectively form a first sealed filling cavity 600 and a second sealed filling cavity 700. The first sealed filling cavity 600 and the second sealed filling cavity 700 of another pipe joint 100 are spliced ​​together to form a sealed cavity 800.

[0032] The outer shell 200 is configured with a first feeding mechanism communicating with the cooling filling cavity. The outer shell 200 is also configured with a first pipeline 900 communicating with the first sealed filling cavity 600 and a second pipeline 1000 communicating with the second sealed filling cavity 700.

[0033] In this way, the pipe segments 100, joined end-to-end, can be assembled to form an entire air duct, facilitating the configuration and layout of the ventilation duct. Furthermore, the first annular groove 400 and the second annular groove 500, disposed on the inner wall of the outer shell 200, respectively form a cooling filling cavity, a first sealed filling cavity 600, and a second sealed filling cavity 700 with the inner shell 300. When the entire ventilation duct is assembled, a cooling filling cavity, a first sealed filling cavity 600, and a second sealed filling cavity 700 are formed between the outer shell 200 and the inner shell 300. Thermally conductive epoxy resin is injected into the cooling filling cavity via a first feeding mechanism, completely filling the entire cooling filling cavity with the resin. The provision of the thermally conductive epoxy resin not only improves the thermal conductivity and fire resistance of the entire pipe segment 100, but also allows the contact between the thermally conductive epoxy resin and the outer wall of the inner shell 300 to bond the outer shell 200 and the inner shell 300, thereby ensuring a more stable assembly of the two. Furthermore, thermal expansion sealing filler can be filled into the sealed cavity 800 via the first pipe 900 or the second pipe 1000. In this way, in the event of a fire, when the ambient temperature rises significantly, the thermal expansion of the thermal expansion sealing filler can completely fill the gap between adjacent pipe sections 100, thereby improving the seal in a fire environment and preventing air leakage. Low specific friction resistance can be achieved by applying a smooth fire-resistant coating to the inner wall of the inner shell 300 to reduce the friction coefficient of the inner wall of the inner shell 300.

[0034] Furthermore, the first feeding mechanism includes a feeding pipe 1100 and an exhaust pipe 1200 communicating with the cooling filling cavity. The exhaust pipe 1200 and the feeding pipe 1100 are symmetrically arranged on the upper and lower sides of the outer shell 200 .

[0035] In this way, when the thermal conductive epoxy resin is blown into the cooling filling cavity, when the outer shell 200 and the inner shell 300 are tightly fitted, the thermal conductive epoxy resin is blown into the cooling filling cavity from the feed pipe 1100 below, and the gas in the cooling filling cavity is discharged from the exhaust pipe 1200, so that the thermal conductive epoxy resin can better fill the cooling filling cavity.

[0036] Furthermore, both the material delivery pipe 1100 and the air extraction pipe 1200 are installed with a blocking cover.

[0037] This prevents the filled thermally conductive epoxy resin from leaking out of the delivery pipe 1100 or the exhaust pipe 1200 .

[0038] Furthermore, a connecting ring plate 1300 is constructed in the first sealed filling cavity 600 , the inner wall of the connecting ring plate 1300 is in contact with the inner wall of the first sealed filling cavity 600 , and one end of the connecting ring plate 1300 extends out of the first sealed filling cavity 600 .

[0039] In this way, by utilizing the setting of the connecting ring plate 1300, after the adjacent two pipe sections 100 are spliced ​​together, the protruding end of the connecting ring plate 1300 can penetrate into the second sealing filling cavity 700 of the other pipe section 100, so that the connecting gap between the adjacent two pipe sections 100 can be changed from a straight line to a curved line, thereby improving the sealing performance of the adjacent two pipe sections 100 after splicing.

[0040] At the same time, two adjacent pipe sections 100 are connected by a bolt 1400 , which passes through the outer shell 200 of one pipe section 100 and the connecting ring plate 1300 of the other pipe section 100 , and one end of the bolt 1400 extends into the sealing cavity 800 .

[0041] In this way, when the bolt 1400 completely passes through the outer shell 200 and the connecting ring plate 1300, the connection stability of the two adjacent pipe sections 100 can be improved. At the same time, even if a certain gap is generated when the bolt 1400 is installed, the gap can be sealed under the action of the thermal expansion sealing filler to ensure the sealing between the two adjacent pipe sections 100.

[0042] Furthermore, the inner shell 300 includes a steel pipe bonded to the inner wall of the outer shell 200, and the inner wall of the steel pipe is bonded and covered with a flame retardant layer.

[0043] Furthermore, the steel pipes in two adjacent pipe sections 100 abut against each other, and the flame-retardant layers in two adjacent pipe sections 100 abut against each other.

[0044] In this way, even if two adjacent flame retardant layers are simply abutted, part of the thermal expansion filler will enter the abutting gap between the two adjacent flame retardant layers during the filling process, thereby ensuring the sealing between the two adjacent flame retardant layers.

[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An assembled low-specific-friction-resistance and low-leakage ventilation duct, characterized in that: including tube segments (100) spliced ​​end to end; The pipe joint (100) comprises an outer shell (200) and an inner shell (300) which are coaxially sleeved, and the inner wall of the outer shell (200) is fitted with the outer wall of the inner shell (300); A first annular groove (400) is formed in the middle section of the inner wall of the outer shell (200) and is arranged around its axis. Second annular grooves (500) are formed at both ends of the inner wall of the outer shell (200) and are arranged around its axis. One side of the second annular groove (500) is provided through the end of the outer shell (200). A cooling filling cavity is formed between the outer wall of the inner shell (300) and the first annular groove (400); the outer wall of the inner shell (300) and the two second annular grooves (500) respectively form a first sealed filling cavity (600) and a second sealed filling cavity (700); the first sealed filling cavity (600) and the second sealed filling cavity (700) of another pipe section (100) are spliced ​​together to form a sealed cavity (800); The outer shell (200) is provided with a first material feeding mechanism in communication with the cooling filling cavity. The outer shell (200) is also provided with a first pipeline (900) in communication with the first sealed filling cavity (600) and a second pipeline (1000) in communication with the second sealed filling cavity (700).

2. The assembled low-specific-friction-resistance and low-leakage ventilation duct according to claim 1, characterized in that: The first material conveying mechanism comprises a material conveying pipe (1100) and an air extraction pipe (1200) in communication with the cooling filling cavity; the material conveying pipe (1100) and the air extraction pipe (1200) are symmetrically arranged on the upper and lower sides of the outer shell (200).

3. The assembled low-specific-friction-resistance and low-leakage ventilation duct according to claim 2, characterized in that: Both the material delivery pipe (1100) and the air extraction pipe (1200) are equipped with a blocking cover.

4. The assembled low-specific-friction-resistance and low-leakage ventilation duct according to claim 1, characterized in that: A connecting ring plate (1300) is constructed in the first sealed filling cavity (600), the inner wall of the connecting ring plate (1300) is in contact with the inner wall of the first sealed filling cavity (600), and one end of the connecting ring plate (1300) extends out of the first sealed filling cavity (600).

5. The assembled low-specific-friction-resistance and low-leakage ventilation duct according to claim 4, characterized in that: Two adjacent pipe sections (100) are connected by a bolt (1400), wherein the bolt (1400) passes through the outer shell (200) of one pipe section (100) and the connecting ring plate (1300) of the other pipe section (100), and one end of the bolt (1400) extends into the sealing cavity (800).

6. The assembled low-specific-friction-resistance and low-leakage ventilation duct according to claim 1, characterized in that: The inner shell (300) comprises a steel pipe (310) bonded to the inner wall of the outer shell (200), and the inner wall of the steel pipe (310) is bonded and covered with a flame retardant layer (320).

7. The assembled low-specific-friction-resistance and low-leakage ventilation duct according to claim 6, characterized in that: The steel pipes (310) in two adjacent pipe sections (100) abut against each other, and the flame retardant layers (320) in two adjacent pipe sections (100) abut against each other.

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