Flexible composite air pipe and machining method

Abstract

The invention relates to a flexible composite air pipe and a machining method, the flexible composite air pipe comprises annular air pipe bodies, a pipe combining sealing adhesive layer, a pipe combining sealing adhesive tape, a lengthening sealing adhesive tape and a lengthening sealing adhesive layer, a pipe combining zipper is arranged in the length direction of the air pipe bodies, and a lengthening zipper is arranged in the circumferential direction of the connected ends of the two air pipe bodies; the pipe closing sealant layer is formed by surface drying of sealant at least filling a first gap, and the first gap is formed between zipper teeth of the pipe closing zipper; the pipe closing sealing adhesive tape is adhered to the air pipe body and covers the pipe closing zipper in an adhering manner; the extension sealing adhesive tape is adhered to the end parts of the two adjacent air pipe bodies and covers the extension zippers in an adhesion manner; the lengthened sealing adhesive layer is formed by surface drying of sealing adhesive at least filling a second gap, and the second gap is formed between the free end of the lengthened sealing adhesive tape and the outer surface of the air pipe body. The problem that in the prior art, the sealing performance and durability are not high can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of flexible air ducts, and in particular to a flexible composite air duct and a processing method thereof. Background Art

[0002] The existing flexible composite duct system is basically produced in the factory and assembled and constructed by zipper connection at the construction site. As the supply / return air duct of the central air conditioning system, the sealing of the duct will greatly affect the air supply effect and energy consumption of the central air conditioning system.

[0003] In order to reduce the air leakage of the flexible composite duct system, the solution is mainly from two aspects: the duct body and on-site assembly. Specifically including:

[0004] The air leakage points of the air duct body are mainly the sewing needle holes, which are usually sealed in the factory by applying sealant.

[0005] The main air leakage points in on-site assembly are the gaps in the zipper connection and the holes at the intersection of the tube zipper and the extended zipper. The main treatment method at present is to set double zippers at the zipper connection (including the tube zipper and the extended zipper), that is, to set zippers on the inner and outer walls of the air duct respectively, and to control the distance between the zipper and the edge of the material, so that the material is squeezed at the edge of the air duct after the zipper is closed, so as to achieve a sealing effect. At the same time, sealing tape is set at the zipper connection (including the tube zipper and the extended zipper) for sealing.

[0006] Although the above solution can solve the air leakage problem to a certain extent, there are still some disadvantages, such as low sealing and durability, which need to be further improved. Specifically, they are as follows:

[0007] 1. The double zipper connection solution is difficult to produce and construct, and has low production and construction efficiency.

[0008] 2. Double zippers mainly use the compression resilience of the material to achieve extrusion sealing. The resilience of rubber-plastic insulation materials weakens as the extrusion time increases. After a period of use, the sealing will deteriorate.

[0009] 3. Sealing tape is generally self-adhesive. When a zipper is subjected to long-term impact of high-pressure airflow in the tube, the tape will separate from the zipper and will not have a sealing effect.

[0010] 4. The gaps at the intersection of the combined zipper and the extended zipper are large and cannot be squeezed and sealed. Summary of the invention

[0011] The embodiments of the present application provide a flexible composite air duct and a processing method to solve the problems of low sealing and durability in the related art.

[0012] In a first aspect, a flexible composite air duct is provided, comprising:

[0013] A plurality of annular air duct bodies, each of which is provided with a closing zipper in the length direction of the air duct body, and a lengthening zipper is provided in the circumferential direction of the ends where two of the air duct bodies are connected;

[0014] A closed tube sealant layer, which is formed by drying the sealant at least filling the first gap, wherein the first gap is formed between the teeth of the closed tube zipper;

[0015] A pipe sealing tape is pasted on the air duct body and covers the pipe zipper;

[0016] An extension sealing tape is adhered to two adjacent ends of the air duct body and covers the extension zipper;

[0017] The extended sealing adhesive layer is formed by the dried surface of the sealing adhesive at least filling the second gap, and the second gap is formed between the free end of the extended sealing adhesive tape and the outer surface of the air duct body.

[0018] In some embodiments, a third gap is formed at the intersection of the combined tube zipper and the extended zipper;

[0019] The length of the extended sealing tape is greater than the length of the extended zipper, and the extended sealing tape is wound around the air duct body for at least one cycle to form an overlapping area between the two ends of the extended sealing tape;

[0020] The overlapping area covers the third gap.

[0021] In some embodiments, the tube-closing sealing tape and the extension sealing tape are made of the same or different materials.

[0022] In some embodiments, the pipe sealing tape is an airtight tape, a self-adhesive tape or a butyl tape;

[0023] And / or, the extension sealing tape is an airtight tape, a self-adhesive tape or a butyl tape.

[0024] In some embodiments, the thickness of the colloid on the tube sealing tape is ≥ 0.8 mm;

[0025] And / or, the thickness of the colloid on the extended sealing tape is ≥0.8 mm.

[0026] In some embodiments, the length of the tube-sealing tape is the same as the length of the tube-sealing zipper.

[0027] In some embodiments, the adhesive strength of the sealant is ≥1 MPa;

[0028] And / or, the sealant is a quick-drying sealant, the surface drying time of which at room temperature is ≤10 minutes, and the curing time is ≤24 hours when the coating thickness is ≤5 mm.

[0029] In some embodiments, the sealant is an elastomer after surface drying and curing, and the elongation of the elastomer is ≥100%, the tensile strength is ≥1Mpa, and the tear strength is ≥3KN / m;

[0030] And / or, the temperature resistance range of the sealant is -30°C to 60°C.

[0031] In some embodiments, the closing zipper is arranged on the outer side of the air duct body in the length direction;

[0032] The extension zipper is arranged on the outer side of the circumferential direction of the ends where the two air duct bodies are connected.

[0033] In a second aspect, a method for processing a flexible composite air duct as described above is provided, comprising the following steps:

[0034] After the zipper of the air duct body is closed in the length direction, a sealant is applied to fill the first gap, and after the sealant is dried to form a sealant layer, a sealant tape is pasted on the air duct body to cover the zipper;

[0035] After closing the circumferential extension zippers at the ends of the two connected duct bodies, the extension sealing tape is pasted on the two adjacent ends of the duct bodies to cover the extension zippers; then sealant is applied to fill the second gap, and the sealant is dried on the surface to form an extension sealant layer.

[0036] The beneficial effects of the technical solution provided by this application include:

[0037] The embodiment of the present application provides a flexible composite air duct and a processing method. The present application adopts sealant coating to form a tube-closed sealant layer and affixes a tube-closed sealing tape to the tube-closed zipper, which effectively avoids the high-pressure airflow in the tube from continuously impacting the tube-closed sealing tape through the first gap between the chain teeth of the tube-closed zipper, thereby preventing the tube-closed sealing tape from detaching from the tube-closed zipper and achieving a durable seal.

[0038] After the extension zipper is closed, the extension sealing tape is applied to the extension zipper, and then the extension sealing tape is set along the circumference of the air duct body. After ventilation, the air duct body expands in all directions due to the pressure inside the duct, so that the extension sealing tape and the air duct body are more closely attached. Even if the extension sealing tape is continuously impacted by the high-pressure airflow inside the air duct body, it is difficult or even impossible for the extension sealing tape to be separated from the extension zipper. Then, the sealant is applied to the joint between the free end of the extension sealing tape and the outer surface of the air duct body, so that the two are bonded together, which plays a reinforcing role in its sealing, and at the same time effectively prevents the high-pressure airflow inside the air duct body from flowing out through the third gap formed at the intersection of the closing zipper and the extension zipper, so as to achieve a lasting seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic diagram of the air duct body before being joined provided in the embodiment of the present application;

[0041] Figure 2 A schematic diagram of the air duct body after being combined according to an embodiment of the present application;

[0042] Figure 3 A schematic diagram of the air duct body after being extended provided in an embodiment of the present application;

[0043] Figure 4 Schematic diagram of the flexible composite air duct provided in an embodiment of the present application.

[0044] In the figure: 1. Duct body; 2. Zipper for closing tubes; 3. Zipper for extending tubes; 4. Sealant layer for closing tubes; 5. Sealant tape for closing tubes; 6. Sealant layer for extending tubes; 7. Sealant tape for extending tubes; 8. The third gap. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0046] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, an embodiment of the present application provides a flexible composite air duct, which includes a plurality of annular air duct bodies 1, a pipe-closing sealing adhesive layer 4, a pipe-closing sealing adhesive tape 5, an extension sealing adhesive layer 6 and an extension sealing adhesive tape 7.

[0047] The air duct body 1 is provided with a closing zipper 2 in the length direction, and an extension zipper 3 is provided in the circumferential direction of the ends where two air duct bodies 1 are connected; when the closing zipper 2 in the length direction of the annular air duct body 1 is opened, the air duct body 1 is in a sheet-like structure. When the extension zipper 3 in the circumferential direction of the ends where two air duct bodies 1 are connected is closed, multiple air duct bodies 1 form a flexible composite air duct. Optionally, the cross section of the annular air duct body 1 is rectangular, circular, elliptical or semicircular, etc.

[0048] When the above-mentioned closed-tube zipper 2 is closed, a first gap is formed between the chain teeth of the closed-tube zipper 2, and a closed-tube sealing adhesive layer 4 is arranged in the first gap. The closed-tube sealing adhesive layer 4 is formed by the sealant that at least fills the first gap and dries on the surface. The closed-tube sealing tape 5 is pasted on the air duct body 1 and pasted to cover the closed-tube zipper 2; after the closed-tube zipper 2 is closed, the surface of the closed-tube zipper 2 is coated and sealed with sealant, so that the first gap between the chain teeth of the closed-tube zipper 2 is sealed with sealant, and after the sealant dries on the surface, a closed-tube sealing adhesive layer 4 is formed, and the closed-tube sealing tape 5 is applied to the closed-tube zipper 2 for sealing reinforcement. The construction method of first applying sealant to form the closed-tube sealing adhesive layer 4 and then pasting the tube sealing tape 5 on the closed-tube zipper 2 effectively avoids the high-pressure airflow in the tube from continuously impacting the closed-tube sealing tape 5 through the first gap between the chain teeth of the closed-tube zipper 2, thereby avoiding the closed-tube sealing tape 5 from being separated from the closed-tube zipper 2, and achieving a durable seal.

[0049] The extended sealing tape 7 is pasted on two adjacent ends of the air duct body 1 and covers the extended zipper 3. The long side of the extended sealing tape 7 serves as a free end and may not be pasted to the outer surface of the air duct body 1, resulting in a gap, i.e., the second gap. Therefore, an extended sealing glue layer 6 is provided, and the extended sealing glue layer 6 is formed by drying the sealant surface at least filling the second gap.

[0050] After the extension zipper 3 is closed, the extension sealing tape 7 is applied to the extension zipper 3, and then the extension sealing tape 7 is arranged along the circumference of the duct body 1. After ventilation, the duct body 1 expands in all directions due to the pressure inside the duct, so that the extension sealing tape 7 fits more closely to the duct body 1. Even if it is continuously impacted by the high-pressure airflow in the duct body 1, the extension sealing tape 7 is difficult to or even will not separate from the extension zipper 3.

[0051] Then, sealant is applied to the joint between the free end of the extended sealing tape 7 and the outer surface of the duct body 1, so that the two are bonded together, which reinforces the seal and effectively prevents the high-pressure airflow in the duct body 1 from flowing out through the third gap 8 formed at the intersection of the combined zipper 2 and the extended zipper 3, thereby achieving a durable seal.

[0052] Since a permanent seal can be provided, there is no need to set a double-layer zipper in the present application, that is, the closing zipper 2 can be set only on the outer side of the length direction of the air duct body 1, and the extension zipper 3 can be set only on the outer side of the circumferential direction of the ends where the two air duct bodies 1 are connected. This can reduce the difficulty of production and construction of the sealing process of the flexible composite air duct.

[0053] See also Figure 3 As shown, a third gap 8 is formed at the intersection of the combined tube zipper 2 and the extended zipper 3. In order to effectively solve the air leakage problem at the intersection of the combined tube zipper and the extended zipper of the flexible composite air duct, in some preferred embodiments, the length of the extended sealing tape 7 is greater than the length of the extended zipper 3, and the extended sealing tape 7 is wound on the air duct body 1 for at least one week to form an overlapping area between the two ends of the extended sealing tape 7; the overlapping area covers the third gap 8.

[0054] When winding, the overlapping area is made to correspond exactly to the leak at the intersection of the combined tube zipper and the extended zipper. Compared with sealing by extrusion, the present application can effectively block and prevent air leakage.

[0055] In the present application, the tube-closing sealing tape 5 and the extending sealing tape 7 may be made of the same or different materials.

[0056] There are many options for the material of the pipe-closing sealing tape 5. For example, the pipe-closing sealing tape 5 is made of airtight tape, self-adhesive tape or butyl tape.

[0057] Similarly, there are multiple choices for the material of the extension sealing tape 7. For example, the extension sealing tape 7 is made of airtight tape, self-adhesive tape or butyl tape.

[0058] The adhesive tape can be preset on the edge of the air duct body 1 in advance to facilitate on-site construction.

[0059] The thickness of the colloid on the tube-closing sealing tape 5 is ≥0.8 mm, which can fill and seal the depressions and gaps on the surface of the zipper connection to achieve sealing.

[0060] The thickness of the colloid on the extended sealing tape 7 is ≥0.8 mm, which can fill and seal the depressions and gaps on the surface of the zipper connection to achieve sealing.

[0061] The length of the tube-closing sealing tape 5 is the same as that of the tube-closing zipper 2, so as to avoid air leakage due to ineffective sealing at some positions of the tube-closing zipper 2 due to being too short, and to avoid the excess part of the tube-closing sealing tape 5 being difficult to stick due to being too long, thereby increasing the difficulty of construction and avoiding waste.

[0062] The sealant is in a fluid state and can effectively fill the connecting gaps of the sprocket teeth of the tube zipper to achieve sealing during the application of the sealant.

[0063] The adhesive strength of the sealant is ≥1 MPa (GB / T 11211-2009), which can effectively bond the free end of the extended sealing tape 7 to the joint of the duct body 1 to achieve sealing.

[0064] The sealant is a quick-drying sealant, the surface drying time of which is ≤10 minutes at room temperature, and the curing time is ≤24 hours when the coating thickness is ≤5 mm, thus meeting the requirements of on-site construction.

[0065] The sealant becomes an elastomer after surface drying and curing, and the elastomer has an elongation of ≥100% (GB / T528-2009), a tensile strength of ≥1Mpa (GB / T 528-2009), and a tear strength of ≥3KN / m (GB / T 528-2009); when the air conditioning system is turned on or off, the flexible composite air duct undergoes ventilation deformation, and the sealant can effectively offset the impact of the air duct deformation, and the sealing performance will not be weakened.

[0066] The temperature resistance range of the sealant is -30°C to 60°C, which can meet the air supply and ambient temperature requirements of the central air-conditioning ventilation duct.

[0067] The embodiment of the present application also provides a method for processing a flexible composite air duct, which comprises the following steps:

[0068] 101: After closing the zipper 2 in the length direction of the duct body 1, apply sealant to fill the first gap. After the sealant is dry to form a sealant layer 4, stick the sealant tape 5 on the duct body 1 to cover the zipper 2.

[0069] 102: After closing the circumferential extension zippers 3 at the ends of the two connected duct bodies 1, stick the extension sealing tape 7 to the two adjacent ends of the duct bodies 1 to cover the extension zippers 3; then apply sealant to fill the second gap, and wait for the sealant to dry on the surface to form an extension sealant layer 6.

[0070] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0071] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0072] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A flexible composite air duct, characterized in that: It includes: A plurality of annular air duct bodies (1), wherein a closing zipper (2) is provided in the length direction of the air duct body (1), and an extension zipper (3) is provided in the circumferential direction of the ends where two of the air duct bodies (1) are connected; A closed tube sealant layer (4), which is formed by drying the sealant surface at least filling a first gap, wherein the first gap is formed between the teeth of the closed tube zipper (2); A pipe-closing sealing tape (5) is adhered to the air duct body (1) and covers the pipe-closing zipper (2); An extension sealing tape (7) is adhered to two adjacent ends of the air duct body (1) and adhered to cover the extension zipper (3); The extended sealing adhesive layer (6) is formed by the surface drying of the sealing adhesive at least filling the second gap, and the second gap is formed between the free end of the extended sealing adhesive tape (7) and the outer surface of the air duct body (1).

2. The flexible composite air duct according to claim 1, characterized in that: A third gap (8) is formed at the intersection of the combined tube zipper (2) and the extended zipper (3); The length of the extended sealing tape (7) is greater than the length of the extended zipper (3), and after the extended sealing tape (7) is wound around the air duct body (1) for at least one cycle, an overlapping area is formed between the two ends of the extended sealing tape (7); The overlapping area covers the third gap (8).

3. The flexible composite air duct according to claim 1, characterized in that: The material of the tube-closing sealing tape (5) and the extending sealing tape (7) is the same or different.

4. The flexible composite air duct according to claim 3, characterized in that: The pipe sealing tape (5) is an airtight tape, a self-adhesive tape or a butyl tape; And / or, the extending sealing tape (7) is made of airtight tape, self-adhesive tape or butyl tape.

5. The flexible composite air duct according to claim 1, characterized in that: The thickness of the colloid on the pipe-sealing tape (5) is ≥ 0.8 mm; And / or, the thickness of the colloid on the extended sealing tape (7) is ≥0.8 mm.

6. The flexible composite air duct according to claim 1, characterized in that: The length of the tube-closing sealing tape (5) is the same as the length of the tube-closing zipper (2).

7. The flexible composite air duct according to claim 1, characterized in that: The adhesive strength of the sealant is ≥1MPa; And / or, the sealant is a quick-drying sealant, the surface drying time of which at room temperature is ≤10 minutes, and the curing time is ≤24 hours when the coating thickness is ≤5 mm.

8. The flexible composite air duct according to claim 1, characterized in that: The sealant is an elastomer after surface drying and curing, and the elongation of the elastomer is ≥100%, the tensile strength is ≥1Mpa, and the tear strength is ≥3KN / m; And / or, the temperature resistance range of the sealant is -30°C to 60°C.

9. The flexible composite air duct according to claim 1, characterized in that: The closing tube zipper (2) is arranged on the outer side of the air duct body (1) in the length direction; The extension zipper (3) is arranged on the outer side of the circumferential direction of the ends where the two air duct bodies (1) are connected.

10. A method for processing a flexible composite air duct according to any one of claims 1 to 9, characterized in that: It includes the following steps: After the tube-closing zipper (2) in the length direction of the air duct body (1) is closed, a sealant is applied to fill the first gap, and after the sealant is dried on the surface to form a tube-closing sealant layer (4), a tube-closing sealing tape (5) is pasted on the air duct body (1) to cover the tube-closing zipper (2); After closing the circumferential extension zipper (3) at the ends of the two connected air duct bodies (1), the extension sealing tape (7) is pasted to the two adjacent ends of the air duct bodies (1) to cover the extension zipper (3); then, a sealant is applied to fill the second gap, and the surface of the sealant is dried to form an extension sealant layer (6).

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