CN221196414U

CN221196414U - Air pipe inner pipe and polyurethane air pipe

Info

Publication number: CN221196414U
Application number: CN202322590038.6U
Authority: CN
Inventors: 周菊明
Original assignee: Suzhou Dakejing Air Duct Co ltd
Current assignee: Suzhou Dakejing Air Duct Co ltd
Priority date: 2023-09-24
Filing date: 2023-09-24
Publication date: 2024-06-21
Anticipated expiration: 2033-09-24

Abstract

The utility model discloses an air duct inner pipe and a polyurethane air duct, wherein the air duct inner pipe comprises a first inner pipe formed by overlapping and winding a first strip-shaped film, a first reinforcing wire is embedded in the overlapped part, the first reinforcing wire and the first strip-shaped film are wound in the same direction in parallel, a first included angle is formed between the width direction of the strip surface of the first strip-shaped film and the winding axis of the first strip-shaped film, and the first included angle is not zero. The polyurethane air duct comprises an air duct inner pipe, a polyurethane heat-insulating layer and an outer sleeve which are wrapped layer by layer from inside to outside. The polyurethane air pipe is formed by adopting the mode that the inner pipe film of the air pipe is wound by the reinforcing wire in an angle mode, and the polyurethane air pipe is formed by injection molding between the inner pipe film and the outer pipe film in an integral mode.

Description

Air pipe inner pipe and polyurethane air pipe

Technical Field

The utility model relates to the field of ventilation pipelines, in particular to an air pipe inner pipe and a polyurethane air pipe.

Background

In central air conditioning ventilation systems, ductwork is an important component. The market demand for the air pipe is biased to heat preservation, economy, light weight and certain rigidity, and is not easy to break.

In the prior art, there is a heat-insulating duct such as chinese patent CN214618268U or japanese patent JP6914032B2, in which a steel wire having a structure of an inner core is overlapped on an adhesive surface of an end of a material to be kept in a tubular shape when the inner core is manufactured by winding the inner core in a tubular shape by winding a band-shaped material into a tubular shape and then laminating only an end of the material, an outer layer material is formed by cutting the material in a tubular shape by a film wound with a band-shaped film to be overlapped and adhered only an end of the material, and the steel wire of the outer layer material is overlapped on an end of the film material of the adhesive surface to be kept in a tubular shape when winding into a cylinder to be adhered. Only the overlapped part of the steel wires at the tail end of the material is a double-sided bonding surface of the material, and as for the outer cover material, only the overlapped part of the steel wires at the tail end of the film material is overlapped to form a double-bonding surface of the film material. And uses glass wool, PET fiber heat insulating material, etc. as heat insulating layer.

However, in the prior art, there are problems that when loose materials such as glass wool and PET fiber heat insulation materials are used as heat insulation layers, the rigidity of an air pipe is insufficient, filling is difficult, and the air pipe fails when wet water is lost, and the inner pipe of japanese patent JP6914032B2 adopts a horizontal parallel winding structure, so that the inter-belt bonding degree is poor, the air leakage problem is easy to occur, the rigidity is insufficient, and the loose materials with lower requirement on the rigidity of the inner pipe in the filling process can only be filled in the glass wool and PET fiber heat insulation materials.

Polyurethane is favored because of light weight, low coefficient of thermal conductivity, good heat preservation performance, water resistance, moisture resistance and long service life. In the prior art, polyurethane is used as two types of heat-insulating pipes, one type is polyurethane heat-insulating pipes, and polyurethane is used for wrapping or filling rigid PPR pipes or PVC pipes and other rigid material pipes, so that the inner pipe/outer pipe is a rigid material pipe, and the weight and the cost of the pipe are high. The other type of polyurethane heat-insulating air pipe is formed by cutting and splicing polyurethane plates (aluminum foils are adhered to the inner surface and the outer surface of polyurethane), and the strength of the pipe mainly depends on the strength of the polyurethane, so that the pipe is easy to break under the action of external force; when cutting and splicing, the utility model is sealed by the adhesive tape, and hidden danger of air leakage exists.

Disclosure of utility model

In order to solve the problems, the utility model discloses an air pipe inner pipe and a polyurethane air pipe so as to provide a rigid heat-insulating air pipe compounded by flexible materials.

According to an aspect of the embodiment of the utility model, there is provided an air duct inner tube, including a first inner tube formed by overlapping and winding a first strip-shaped film, wherein a first reinforcing wire is embedded in the overlapping portion, the first reinforcing wire and the first strip-shaped film are wound in the same direction in parallel, a first included angle is formed between the width direction of the strip surface of the first strip-shaped film and the winding axis of the first strip-shaped film, and the first included angle is not zero.

In one embodiment, the method comprises the steps of forming a first inner tube by using a first strip-shaped film to be partially overlapped and wound and forming a second inner tube by using a second strip-shaped film to be partially overlapped and wound outside the first strip-shaped film, wherein first reinforcing wires are embedded in the overlapped part of the first inner tube, the first reinforcing wires are wound in the same direction in parallel with the first strip-shaped film, and the second strip-shaped film is wound in a staggered joint mode relative to the first strip-shaped film.

In one embodiment, the first tape has a first angle between the width direction of the first tape and the winding axis, and the first angle is not zero.

In one embodiment, the thickness of the first strip film is no greater than the thickness of the second strip film.

In one embodiment, the second ribbon film has a second included angle with its winding axis, the second included angle being not smaller than the first included angle.

In one embodiment, in any one of the turn winding structures, an overlapping portion of the first band-like film has a first inner turn relatively inward and a first outer turn partially wound around the first inner turn, and an adjacent overlapping portion of the second band-like film has a second inner turn relatively inward and a second outer turn partially wound around the second inner turn, the second inner turn being wound around the first outer turn simultaneously with the first outer turn.

In one embodiment, the second inner race is wound offset from the first outer race.

In one embodiment, there is a first gap between the second inner ring and the first outer ring in the width direction of the first inner ring.

In one embodiment, the first gap is filled with an elastomeric gel.

In one embodiment, the method comprises a first inner tube formed by using a first strip-shaped film to be partially overlapped and wound, a second inner tube formed by using a second strip-shaped film to be partially overlapped and wound outside the first strip-shaped film, and a third inner tube formed by using a third strip-shaped film to be partially overlapped and wound outside the second strip-shaped film, wherein second reinforcing wires are embedded in overlapped parts of the second inner tube, the second reinforcing wires and the second strip-shaped film are wound in parallel in the same direction, and the third strip-shaped film, the second strip-shaped film and the first strip-shaped film are wound in a staggered joint mode.

In one embodiment, in any one of the winding structures, an overlapping portion of the first band-like film has a first inner ring relatively inward and a first outer ring partially wound around the first inner ring, an adjacent overlapping portion of the second band-like film has a second inner layer relatively inward and a second middle layer partially wound around the second inner layer, and a second outer layer partially wound around the second middle layer, an adjacent overlapping portion of the third band-like film has a third inner ring relatively inward and a third outer ring partially wound around the third inner ring, the second inner layer is wound around the first inner ring, the second middle layer is wound around the first outer ring simultaneously, the third inner ring is wound around the second middle layer simultaneously, and the third outer ring is wound around the second outer layer simultaneously.

In one embodiment, the second inner layer is wound offset from the first outer ring.

In one embodiment, the third inner race is wound with the second outer layer in error.

In one embodiment, a second gap is provided between the second inner layer and the first outer ring in the width direction of the first inner ring.

In one embodiment, a third gap is provided between a third inner ring and a second outer layer in the width direction of the second middle layer.

In one embodiment, the third gap is less than the second gap.

In one embodiment, the second gap and/or the third gap is filled with an elastic glue.

In one embodiment, the thickness of the third strip film, the second strip film, and the first strip film decreases layer by layer.

In one embodiment, the first inner tube is formed by overlapping and winding a first strip-shaped film part, wherein third reinforcing wires and fourth reinforcing wires are embedded in the overlapping part at intervals, and the third reinforcing wires and the fourth reinforcing wires are wound in the same direction in parallel with the first strip-shaped film.

In one embodiment, the third and fourth reinforcing filaments have different diameters.

In one embodiment, the method comprises a first inner tube formed by overlapping and winding a first strip-shaped film, a second inner tube formed by overlapping and winding a second strip-shaped film outside the first strip-shaped film, and a third inner tube formed by overlapping and winding a third strip-shaped film outside the second strip-shaped film, wherein overlapped parts of the first inner tube, the second inner tube and the third inner tube are respectively embedded with fifth reinforcing wires, sixth reinforcing wires and seventh reinforcing wires.

In one embodiment, the fifth, sixth and seventh reinforcing filaments are intertwined with one another.

In one embodiment, the third strip-shaped film, the second strip-shaped film and the first strip-shaped film are wound in a staggered joint mode.

In one embodiment, the fifth reinforcement wire has a diameter smaller than the diameter of the sixth reinforcement wire and/or the seventh reinforcement wire.

In one embodiment, the first tape film has a thickness of no more than 0.1mm.

In one embodiment, the first, second, third, fourth, fifth, sixth, seventh reinforcing wires are iron wires or steel wires, with a diameter of 0.5-2.0mm.

In one embodiment, the first included angle is set to: an arcsine function value of a ratio of a thickness of the first band-shaped film to a pitch of the first reinforcing wire.

In one embodiment, the first strip film is a silver ion coated film or a bacteriostatic plastic film.

According to another aspect of an embodiment of the present utility model, there is provided a polyurethane air duct comprising an air duct inner tube, a polyurethane insulation layer and an outer jacket according to any one of the preceding claims, which are arranged in a layer-by-layer wrapping manner from inside to outside.

In one embodiment, the polyurethane heat-insulating layer is formed by injecting polyurethane between the air pipe inner pipe and the outer sleeve, and is formed by foaming and is integrated with the air pipe inner pipe and the outer sleeve.

In one embodiment, the polyurethane heat-insulating layer is a prefabricated semicircular polyurethane heat-insulating sleeve, the two semicircular polyurethane heat-insulating sleeves are mutually spliced and assembled, and the joint is in concave-convex fit.

In one embodiment, the polyurethane insulation layer has a thickness of 10-100mm.

In one embodiment, the outer sleeve can be formed by compounding one or more of aluminum foil, aluminum foil polyester film, copper foil polyester film, PVC film, PU film, TPV film, PVC sandwich mesh cloth and PU sandwich mesh cloth.

In one embodiment, spiral steel wires are wound in the outer sleeve wall or composite reinforcing ribs are wound on the outer side of the sleeve wall.

In one embodiment, the air pipe inner pipe and the outer sleeve are respectively adhered and fixed by an adhesive.

The inner pipe film is fixed by winding the steel wire at an angle, and the polyurethane air pipe is integrally formed by injection molding between the inner pipe film and the outer pipe, so that the utility model has the characteristics of light dead weight, high strength, good heat insulation and low cost, and can be widely applied to ventilation systems such as central air-conditioning ventilation systems and the like.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present utility model, should fall within the ambit of the technical disclosure.

FIG. 1 is a schematic cross-sectional view of a first embodiment of an air duct inner tube according to the present utility model;

FIG. 2 is a schematic cross-sectional view of a second embodiment of an air duct inner tube according to the present utility model;

FIG. 3 is an enlarged schematic cross-sectional view of a second embodiment A of an air duct inner tube according to the present utility model;

FIG. 4 is a schematic cross-sectional view of a third embodiment of an air duct inner tube according to the present utility model;

FIG. 5 is an enlarged schematic cross-sectional view of a third embodiment B of an air duct inner tube according to the present utility model;

FIG. 6 is a schematic view of a fourth embodiment of an air duct inner tube according to the present utility model;

FIG. 7 is a schematic view of a fifth embodiment of an air duct inner tube according to the present utility model;

FIG. 8 is a schematic cross-sectional view of a polyurethane air duct according to the present utility model;

fig. 9 is a comparative illustration.

Reference numerals illustrate:

100-an inner pipe of the air pipe,

101-First reinforcing wire, 102-second reinforcing wire, 103-third reinforcing wire, 104-fourth reinforcing wire, 105-fifth reinforcing wire, 106-sixth reinforcing wire, 107-seventh reinforcing wire,

110-First strip film, 111-first inner ring, 112-first outer ring,

120-Second strip film, 121-second inner ring, 122-second outer ring, 123-second inner layer, 124-second middle layer, 125-second outer layer,

130-Third strip film, 131-third inner ring, 132-third outer ring,

191-First gap, 192-second gap, 193-third gap;

200-polyurethane heat-insulating layer and 300-coat.

Detailed Description

Other advantages and advantages of the present utility model will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

According to one aspect of the present utility model, an air duct inner tube 100 is provided.

Specifically, the first embodiment discloses an air duct inner tube 100, as shown in fig. 1, including a first inner tube formed by partially overlapping and winding a single first strip-shaped film 110, wherein a first reinforcing wire 101 is embedded in the overlapping portion, and the first reinforcing wire 101 is wound in parallel and in the same direction with the first strip-shaped film 110.

In one embodiment, the overlapping portion is glued around the first reinforcement wire 101.

In one embodiment, the first tape film 110 has a tape width direction at a first angle α with respect to the winding axis, wherein the first angle α is non-zero. The first strip-shaped film 110 can be spirally and closely attached back and forth in winding by setting the width direction of the strip surface at the angle alpha, namely, the first strip-shaped films 110 wound in each circle are mutually parallel and have an included angle alpha with the axis, so that warping gaps are not formed, and the air tightness and the rigidity of the air pipe inner pipe 100 are improved.

The second embodiment discloses an air duct inner tube 100, as shown in fig. 2, which comprises a first inner tube formed by partially overlapping and winding a single first strip-shaped film 110 and a second inner tube formed by partially overlapping and winding a second strip-shaped film 120 outside the first strip-shaped film 110, wherein a first reinforcing wire 101 is embedded in the overlapping part of the first inner tube, the first reinforcing wire 101 is wound in parallel and in the same direction with the first strip-shaped film 110, and the second strip-shaped film 120 is wound and stuck in a staggered manner relative to the first strip-shaped film 110. By the staggered joint winding of the second strip-shaped film 120 and the first strip-shaped film 110, higher joint strength is obtained. The air tightness and rigidity of the air duct inner tube 100 are improved.

In one embodiment, the overlapping portion of the first inner tube is glued around the first reinforcing wire 101.

In one embodiment, the first film strip 110 has a strip width direction at an angle α to its winding axis, where the angle α is non-zero. The first strip-shaped film 110 can be spirally and closely attached back and forth in winding by setting the width direction of the strip surface at the angle alpha, namely, the first strip-shaped films 110 wound in each circle are mutually parallel and have an included angle alpha with the winding axis, so that warping gaps are not formed, and the air tightness and the rigidity of the air pipe inner pipe 100 are improved.

In one embodiment, the thickness of the first band-shaped thin film 110 is not greater than the thickness of the second band-shaped thin film 120, so that the first inner tube of the inner layer has a smaller thin film wall thickness, as shown in fig. 2, since the width direction of the band surface of the first band-shaped thin film 110 forms an angle α with the axis, thus, in the overlapping portion of each turn of the first band-shaped thin film 110, the inner ring formed by winding has a step formed by the thin film wall thickness thereof on the micro millimeter scale, and the step is spirally disposed in the first inner tube as the first band-shaped thin film 110 is wound, forming wind resistance. By setting the thickness of the first strip film 110 smaller, the step height is reduced on a microscopic scale, so that the inner wall of the air pipe inner pipe 100 is smoother, and the wind resistance is reduced. Preferably, the ratio of the thickness of the first band-shaped film 110 to the thickness of the second band-shaped film 120 is less than 0.7.

In one embodiment, the second ribbon film 120 includes a second angle β with respect to the winding axis, wherein the second angle β is not less than the angle α and is greater than zero. Thus, the thickness ratio of the first band-shaped thin film 110 to the second band-shaped thin film 120 can be increased to a larger extent without warping the inner wall of the duct inner pipe 100.

In one embodiment, in any one turn winding structure, as shown in fig. 3, any overlapping portion of the first tape film 110 has a first inner turn 111 relatively inward and a first outer turn 112 partially wound outside the first inner turn 111. Likewise, the adjacent overlapping portion of the second band-like film 120 has a second inner ring 121 relatively inward and a second outer ring 122 partially wound around the second inner ring 121. And, the second inner ring 121 is wound and pressed on the outer side of the first inner ring 111, that is, the second inner ring 121 and the first outer ring 112 are wound and pressed on the outer side of the first inner ring 111 at the same time, so that two overlapping areas are formed.

In one embodiment, the second inner ring 121 is wound offset from the first outer ring 112, i.e., in either winding, the second inner ring 121 does not overlap the first outer ring 112. Therefore, the second strip-shaped film 120 can be tightly wound and attached with the first strip-shaped film 110, and the rigidity strength of the air duct inner pipe 100 is increased.

In one embodiment, a first gap 191 is provided between the second inner ring 121 and the first outer ring 112 in the width direction of the first inner ring 111. Through the arrangement of the first gap 191, the expansion and contraction toughness of the air pipe inner pipe 100 is improved on the basis of rigidity strength, so that when the outer wall of the air pipe inner pipe 100 is extruded, deformation stress can be absorbed through the first gap 191, and the first inner pipe is prevented from being broken.

In one embodiment, the first gap 191 is filled with an elastic glue, which may be formed by curing an adhesive, so that the stress is absorbed by the elasticity of the elastic glue, and the compression of the stress to the first inner tube is prevented from causing the breakage. The adhesive can be used when the air pipe inner pipe 100 is wound and stuck.

The third embodiment discloses an air duct inner tube 100, as shown in fig. 4, comprising a first inner tube formed by partially overlapping and winding a single first strip-shaped film 110, a second inner tube formed by partially overlapping and winding a second strip-shaped film 120 outside the first strip-shaped film 110, and a third inner tube formed by partially overlapping and winding a third strip-shaped film 130 outside the second strip-shaped film 120, wherein second reinforcing wires 102 are embedded in the overlapping part of the second inner tube, the second reinforcing wires 102 and the second strip-shaped film 120 are wound in parallel and in the same direction, and the third strip-shaped film 130, the second strip-shaped film 120 and the first strip-shaped film 110 are wound in staggered joints. The third strip-shaped film 130, the second strip-shaped film 120 and the first strip-shaped film 110 are in staggered joint winding and pasting to obtain higher joint strength, and the air tightness and the rigidity of the air pipe inner pipe 100 are improved.

In one embodiment, the overlapping portion of the second inner tube is glued around the second reinforcement wire 102.

In one embodiment, the first film 110 has a tape width direction at an angle α to the axis, where the angle α is non-zero. The first strip-shaped film 110 can be spirally and closely attached back and forth in winding by setting the width direction of the strip surface at the angle alpha, namely, the first strip-shaped films 110 wound in each circle are mutually parallel and have an included angle alpha with the axis, so that warping gaps are not formed, and the air tightness and the rigidity of the air pipe inner pipe 100 are improved.

In one embodiment, in any one turn winding structure, as shown in fig. 5, any overlapping portion of the first tape film 110 has a first inner turn 111 relatively inward and a first outer turn 112 partially wound outside the first inner turn 111. Likewise, adjacent overlapping portions of the second strip film 120 have a second inner layer 123 that is relatively inward, a second middle layer 124 that is partially wrapped around the second inner layer 123, and a second outer layer 125 that is partially wrapped around the second middle layer 124. The adjacent overlapping portion of the third band-shaped film 130 has a third inner ring 131 relatively inward and a third outer ring 132 partially wound around the third inner ring 131.

The second inner layer 123 is wound around the first inner ring 111, the second middle layer 124 is wound around the first outer ring 112, the third inner ring 131 is wound around the second middle layer 124, and the third outer ring 132 is wound around the second outer layer 125. Accordingly, the third outer ring 132 is wound and pressed with the third inner ring 131, the second middle layer 124, the second inner layer 123, the first inner ring 111, the second outer layer 125, the second middle layer 124, the first outer ring 112 and the first inner ring 111 layer by layer, respectively, so that the air tightness and the rigidity of the air pipe inner pipe 100 are improved.

In one embodiment, the second inner layer 123 is wound offset from the first outer race 112, i.e., in either turn, the second inner layer 123 does not overlap the first outer race 112. Therefore, the second strip-shaped film 120 can be tightly wound and attached with the first strip-shaped film 110, and the rigidity strength of the inner side of the air pipe inner pipe 100 is increased.

In one embodiment, third inner ring 131 is wound offset from second outer layer 125, i.e., in either turn, third inner ring 131 is not overlapped with second outer layer 125. Therefore, the third strip-shaped film 130 can be tightly wound and attached with the second strip-shaped film 120, and the rigidity strength of the outer side of the air pipe inner pipe 100 is increased.

In one embodiment, in the width direction of first inner race 111, second gap 192 is provided between second inner layer 123 and first outer race 112. By the arrangement of the second gap 192, the expansion and contraction toughness of the air pipe inner pipe 100 is improved on the basis of rigidity strength, so that when the air pipe inner pipe 100 is extruded, deformation stress can be absorbed through the second gap 192, and the first inner pipe is prevented from being broken.

In one embodiment, third gap 193 is provided between third inner ring 131 and second outer layer 125 in the width direction of second middle layer 124. By setting the third gap 193, the expansion and contraction toughness of the air pipe inner pipe 100 is improved on the basis of rigidity strength, so that when the air pipe inner pipe 100 is extruded, deformation stress can be absorbed through the third gap 193, and the first inner pipe and the second inner pipe are prevented from being broken.

In one embodiment, the third gap 193 and/or the second gap 192 are filled with an elastic glue, which may be formed by curing the adhesive, such that the compression of the first inner tube and/or the second inner tube by stress conduction is avoided by the elastic absorption of stress by the elastic glue. The adhesive can be used when the air pipe inner pipe 100 is wound and stuck.

In one embodiment, the third gap 193 is smaller than the second gap 192 to enhance the support of the third inner tube while protecting the first inner tube, biasing the mechanical properties of the ductwork inner tube 100 toward inner-flexible-out-rigid to better resist out-of-duct stresses and to protect the first inner tube from cracking via layer-by-layer absorption digestion of the third gap 193 and the second gap 192.

In one embodiment, the third and second band films 130 and 120 are not less than the thickness of the first band film 110. Preferably, the thicknesses of the third strip-shaped film 130, the second strip-shaped film 120 and the first strip-shaped film 110 are gradually decreased layer by layer, so that the mechanical property of the air pipe inner pipe 100 is biased to be flexible and rigid, and the wind resistance of the inner wall is reduced.

Although the above embodiment gives the concept of the relationship between the third gap and the second gap, and the relationship between the thicknesses of the third strip film 130, the second strip film 120, and the first strip film 110, in practical application, the above improvement direction may be omitted, and the thicknesses of the third gap and the second gap, and the third strip film 130, the second strip film 120, and the first strip film 110 may be simply set at will, for example, the third gap and/or the second gap are eliminated, that is, the second inner layer 123 and the first outer ring 112 are overlapped against each other to increase the overall thickness of the pipe wall. Or the thickness of the third strip film 130 is set to be smaller than the thickness of the second strip film 120 and the first strip film 110 so that the outer surface of the air duct inner tube is relatively flat. All such modifications and improvements are intended to be within the scope of this utility model as claimed.

The fourth embodiment discloses an air duct inner tube 100, as shown in fig. 6, comprising a first inner tube formed by partially overlapping and winding a single first strip-shaped film 110, wherein third reinforcing wires 103 and fourth reinforcing wires 104 are embedded in the overlapping portion at intervals, and the third reinforcing wires 103 and the fourth reinforcing wires 104 are wound in parallel and in the same direction with the first strip-shaped film 110.

In one embodiment, the overlapping portion is glued around the third 103 and fourth 104 reinforcement wires.

In one embodiment, the diameters of the third and fourth reinforcing wires 103 and 104 are different, and the combination of the high-elasticity thin reinforcing wire and the low-elasticity thick reinforcing wire achieves the purposes of both elasticity (deformation resistance) and rigidity (formability) of the pipe.

The fifth embodiment discloses an air duct inner tube 100, as shown in fig. 4, comprising a first inner tube formed by partially overlapping and winding a single first strip-shaped film 110, a second inner tube formed by partially overlapping and winding a second strip-shaped film 120 outside the first strip-shaped film 110, and a third inner tube formed by partially overlapping and winding a third strip-shaped film 130 outside the second strip-shaped film 120.

The overlapped portions of the first, second and third inner pipes are respectively embedded with fifth, sixth and seventh reinforcing wires 105, 106 and 107 to increase the rigidity of the air duct inner pipe 100.

The fifth reinforcing wire 105 is wound in parallel and in the same direction as the first band-shaped film 110, the sixth reinforcing wire 106 is wound in parallel and in the same direction as the second band-shaped film 120, and the seventh reinforcing wire 107 is wound in parallel and in the same direction as the third band-shaped film 130. The fifth reinforcing wire 105, the sixth reinforcing wire 106, and the seventh reinforcing wire 107 are intertwined with each other. To disperse stress and further improve the rigidity and toughness of the ductwork inner pipe 100.

The third strip-shaped film 130, the second strip-shaped film 120 and the first strip-shaped film 110 are wound in a staggered joint way. The third strip-shaped film 130, the second strip-shaped film 120 and the first strip-shaped film 110 are in staggered joint winding and pasting to obtain higher joint strength, and the air tightness and the rigidity of the air pipe inner pipe 100 are improved.

In one embodiment, the overlapping portions of the first, second and third inner tubes are glued around the fifth, sixth and seventh reinforcing wires 105, 106 and 107, respectively.

In one embodiment, the fifth reinforcement wire 105 has a smaller diameter than the sixth reinforcement wire 106 and/or the seventh reinforcement wire 107 to increase the flexibility of the fifth reinforcement wire 105 to avoid snagging the first inner tube conduit during its winding.

In all the foregoing embodiments, the first strip film 110 has a thickness T and a pitch H1, and the first included angle α is set as an arcsine function of the ratio of the thickness T to the pitch H1, i.e., the first included angle α=arcsin (thickness T/pitch H1). The width direction of the strip surface of the first strip film 110 can be set based on the thickness and the pitch of the film, so that the first strip film 110 wound by each circle of the first strip film 110 is parallel to each other, no warping gap exists, and the air tightness and the rigidity of the air pipe inner pipe 100 are improved.

In all the foregoing embodiments, the film material of the band-shaped film may be a flexible film material such as an existing aluminum foil polyester film, copper foil polyester film, PVC film, PET film, PU film, TPV film, aluminized film, copper plated film, silver plated film, or other plastic, rubber, metal film, or the like. It should be noted that the use of thin and flexible film materials, such as PVC film, when used in the form of integral rigid tubing or hard materials is not within the scope of the present utility model.

Preferably, the thickness of the first tape film 110 is not more than 0.1mm.

In one embodiment, the first strip film 110 is made of a different material than the second strip film 120 and the third strip film 130. The first strip film 110 may be made of an existing antibacterial material, such as a silver ion coating film, a antibacterial plastic film, an antibacterial film, etc., so as to perform antibacterial function in the air duct.

In all the previous embodiments, the reinforcing wire is an elastically deformable wire, preferably an iron or steel wire, with a diameter of 0.5-2.0mm. The combination of the thickness and the material is selected to make the reinforcing wire have both rigidity and elasticity, so that the air pipe inner pipe 100 has both pipe elasticity (deformation resistance) and rigidity (formability).

It should be noted that, in all the foregoing embodiments, the descriptions of the first inner ring 111, the first outer ring 112, the second inner ring 121, the second outer ring 122, the second inner layer 123, the second middle layer 124, the second outer layer 125, the third inner ring 131, and the third outer ring 132 are for convenience of description of the multilayer film winding laminated structure, and it should be understood that the above-mentioned distinguishing expressions are limited to a certain winding range, and substitution into the drawings is not limited to a specific structure, but merely indicates a mutual lamination relationship between winding films, and the mutual lamination relationship of the expressions is caused to appear in a circulation in the air duct inner tube 100 due to the spiral winding structure of the films.

The width direction of the tape surface is a vector direction formed by bonding the tape surface of the tape film in a wound state along the width direction, as will be understood from the drawings. By setting the inclination angle of the belt surface relative to the axis, the overlapping positions of each circle of winding belt can be arranged in parallel relatively to each other, and the outer ring is prevented from being additionally bent and protruded relative to the inner ring, so that the stress state of the overlapping positions can be effectively improved, the tightness is improved, and the service life is prolonged.

It will be appreciated that the angle of the vector direction of the strip of film along its width to the axis is typically no more than 1, taking into account the film thickness and pitch.

According to another aspect of the present utility model, there is provided a polyurethane air duct including an air duct inner pipe 100, a polyurethane insulation layer 200 and an outer jacket 300, which are provided to wrap from inside to outside.

In one embodiment, the polyurethane insulation layer 200 is formed by injecting polyurethane between the air duct inner tube 100 and the outer sleeve 300, and is formed integrally with the air duct inner tube 100 and the outer sleeve 300. Due to the good rigidity and toughness of the air pipe inner pipe 100, when polyurethane is injected between the inner pipe and the outer sleeve, the air pipe inner pipe 100 can bear polyurethane foaming extrusion without obvious deformation, and the first inner pipe cannot be broken, so that polyurethane can be integrally formed between the air pipe inner pipe 100 and the outer sleeve 300, the process can be simplified, the integrally formed polyurethane has no joint gap, the heat preservation effect is good, the heat preservation effect can provide additional rigid support for the polyurethane air pipe, the cost is low, and the service life is greatly prolonged.

In one embodiment, the polyurethane thermal insulation layer 200 may be a prefabricated semicircular polyurethane thermal insulation sleeve, and the two semicircular polyurethane thermal insulation sleeves are assembled by mutually splicing, and the joints are in concave-convex fit (not shown). The semicircular polyurethane heat preservation sleeve can be elliptical or rectangular. The prefabricated semicircular polyurethane insulation sleeve has lower requirements on rigidity and toughness of the air pipe inner pipe 100, but has a joint gap.

In one embodiment, the polyurethane insulation 200 is 10-100mm thick to allow for insulation and reduce volume occupancy.

In one embodiment, the jacket 300 may be formed from one or more of aluminum foil, aluminum foil polyester film, copper foil polyester film, PVC film, PU film, TPV film, PVC mesh, PU mesh, and other lightweight flexible material films such as plastic coated cloth or rubber cloth.

In one embodiment, the ductwork inner tube 100 and/or the outer jacket 300 may be separately adhesively bonded. I.e., the composite wrap of the ductwork inner tube 100 and/or the composite wrap of the outer jacket 300, are adhesively secured when the intertwines overlap. The adhesive can form an adhesive layer, and can provide a certain elastic supporting force after drying and curing so as to improve the flexibility of the air duct inner pipe 100 and the outer sleeve 300. The adhesive uses the existing adhesive, and no additional limitation is made here.

In one embodiment, spiral steel wires can be wound in the pipe wall of the outer sleeve 300 or composite reinforcing ribs can be wound on the outer side of the pipe wall so as to improve the strength of the outer sleeve 300. Because the polyurethane has the characteristic of expansion during foaming and shrinkage after fixed forming in the injection molding process, the spiral steel wires or the reinforcing ribs are wound around the pipe wall of the outer sleeve 300 to resist the expansion and shrinkage in the injection molding process, so that the outer surface of the outer sleeve is relatively flat, and the problem of uneven surface caused by expansion and shrinkage is avoided.

The air duct inner pipe 100 is the air duct inner pipe 100 of the foregoing embodiment.

Fig. 9 shows a parallel winding manner as a comparative example. It can be seen that when the winding surface of the strip-shaped film is parallel to the winding axis, at the overlapping position between the layers, the film of the outer ring protrudes outwards relative to the film of the inner ring and is fixed on the outer side of the inner ring through glue, so that the S-shaped stretching of the film of the outer ring brought about at the overlapping position is forced to be fixed, resulting in the existence of component force far away from the axis, and accordingly, as time goes on and the cold and hot changes, when the bonding force of the adhesive is reduced, the film of the outer ring at the overlapping position is accelerated to separate from the eversion under the stress far away from the axis, thereby resulting in the reduction of the air tightness and strength of the inner pipe and the influence on the service life.

By the film winding structure, the overlapping positions of each winding belt can be arranged in parallel relatively by the arrangement of the inclined angle of the belt surface relative to the axis, and the outer ring is prevented from being additionally bent and protruded relative to the inner ring, so that the stress state of the overlapping positions can be effectively improved, the tightness is improved, and the service life of the film winding structure is prolonged.

The polyurethane air pipe is fixed by winding the steel wire by the inner pipe film, and the polyurethane is injection molded between the inner pipe and the outer pipe into an integral molding structure, so that the polyurethane air pipe has the characteristics of light dead weight, high strength, good heat insulation and low cost compared with the prior art, is convenient to install, and can be widely applied to ventilation systems such as a central air conditioner ventilation system and the like. The air pipe inner pipe of the utility model can be used as a common air pipe or prefabricated member for independent use and sale due to good mechanical property and air tightness.

In actual use, the winded air duct inner pipe can be pressed into an oval shape or a square shape based on actual needs, and the outer sleeve with the same shape is matched, and polyurethane is injected between the air duct inner pipe and the outer sleeve to form an integral polyurethane air duct. Therefore, the polyurethane air duct of the present utility model can be manufactured into various shapes according to the need, and no additional limitation is made herein.

In the description of the present utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," "rear," and the like indicate an azimuth or a positional relationship based on that shown in the drawings, and are merely for convenience of description and to simplify the description, but do not indicate or imply that the apparatus or elements to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or communicating between the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Embodiments of the utility model and features of the embodiments may be combined with each other without conflict. In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

While the utility model has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.

Claims

1. An air pipe inner pipe is characterized in that,

The first inner tube is formed by overlapping and winding a first strip-shaped film part, a first reinforcing wire is embedded in the overlapping part, the first reinforcing wire and the first strip-shaped film are wound in the same direction in parallel, a first included angle is formed between the width direction of the strip surface of the first strip-shaped film and the winding axis of the strip surface of the first strip-shaped film, and the first included angle is not zero.

2. An air pipe inner pipe is characterized in that,

Comprises a first inner tube formed by overlapping and winding a first strip-shaped film and a second inner tube formed by overlapping and winding a second strip-shaped film outside the first strip-shaped film, wherein first reinforcing wires are embedded in the overlapped part of the first inner tube, the first reinforcing wires and the first strip-shaped film are wound in parallel and in the same direction,

The second strip-shaped film is in staggered joint and wound and stuck relative to the first strip-shaped film.

3. The ductwork inner pipe according to claim 2, wherein,

The first included angle is formed between the width direction of the strip surface of the first strip-shaped film and the winding axis of the strip surface of the first strip-shaped film, and the first included angle is not zero.

4. The ductwork inner pipe according to claim 2, wherein,

The thickness of the first band-shaped film is not greater than the thickness of the second band-shaped film.

5. The ductal inner pipe according to claim 3, characterized in that,

The second ribbon film has a second included angle with the winding axis, and the second included angle is not smaller than the first included angle.

6. The ductwork inner pipe according to claim 2, wherein,

In either turn-around structure, an overlapping portion of the first tape film has a first inner turn relatively inward and a first outer turn partially wound around the first inner turn,

The adjacent overlapping portion of the second band-shaped film has a second inner ring relatively inward and a second outer ring partially wound around the second inner ring,

The second inner ring and the first outer ring are simultaneously wound and pressed on the outer side of the first inner ring.

7. The ductal inner pipe according to claim 6, wherein,

The second inner ring and the first outer ring are wound in a staggered mode.

8. The ductal inner pipe of claim 7, wherein,

A first gap is formed between the second inner ring and the first outer ring in the width direction of the first inner ring.

9. The ductal inner pipe of claim 8, wherein,

The first gap is filled with an elastic glue.

10. An air pipe inner pipe is characterized in that,

Comprises a first inner tube formed by using a first strip-shaped film to be partially overlapped and wound, a second inner tube formed by using a second strip-shaped film to be partially overlapped and wound outside the first strip-shaped film, and a third inner tube formed by using a third strip-shaped film to be partially overlapped and wound outside the second strip-shaped film,

The overlapped part of the second inner tube is embedded with a second reinforcing wire which is wound in parallel and in the same direction with the second ribbon-shaped film,

The third strip-shaped film, the second strip-shaped film and the first strip-shaped film are in staggered joint winding and pasting.

11. The ductal inner pipe of claim 10, wherein,

12. The ductal inner pipe of claim 10, wherein,

The adjacent overlapping portion of the second strip-like film has a second inner layer relatively inward, a second middle layer partially wrapped around the second inner layer, and a second outer layer partially wrapped around the second middle layer, the adjacent overlapping portion of the third strip-like film has a third inner ring relatively inward and a third outer ring partially wrapped around the third inner ring,

The second inner layer is wound and pressed on the outer side of the first inner ring, the second middle layer is wound and pressed on the outer side of the first outer ring simultaneously, the third inner ring is wound and pressed on the outer side of the second middle layer, and the third outer ring is wound and pressed on the outer side of the second outer layer simultaneously.

13. The ductal inner pipe of claim 12, wherein,

The second inner layer is staggered and wound with the first outer ring.

14. The ductal inner pipe of claim 13, wherein,

The third inner ring and the second outer ring are wound in a staggered manner.

15. The ductal inner pipe of claim 12, wherein,

A second gap is arranged between the second inner layer and the first outer ring in the width direction of the first inner ring.

16. The ductal inner pipe of claim 15, wherein,

And a third gap is arranged between the third inner ring and the second outer layer in the width direction of the second middle layer.

17. The ductal inner pipe of claim 16, wherein,

And elastic glue is filled in the second gap and/or the third gap.

18. The ductal inner pipe of claim 11, wherein,

The third and second band-shaped films are not smaller than the thickness of the first band-shaped film.

19. An air pipe inner pipe is characterized in that,

Comprising a first inner tube formed by partially overlapping and winding a first strip-shaped film,

Third and fourth reinforcing wires are embedded in the overlapping part at intervals,

The third reinforcing wire and the fourth reinforcing wire are wound in parallel and in the same direction with the first strip-shaped film.

20. The ductal inner pipe of claim 19, wherein,

The third and fourth reinforcing filaments have different diameters.

21. The ductal inner pipe of claim 19, wherein,

22. An air pipe inner pipe is characterized in that,

And fifth reinforcing wires, sixth reinforcing wires and seventh reinforcing wires are respectively embedded in the overlapped parts of the first inner tube, the second inner tube and the third inner tube.

23. The ductal inner pipe of claim 22, wherein,

The fifth, sixth and seventh reinforcing wires are intertwined with each other.

24. The ductal inner pipe of claim 22, wherein,

25. The ductal inner pipe according to any of the claims 1 to 24, characterized in,

The first tape film has a thickness of not more than 0.1mm.

26. The ductal inner pipe according to any of the claims 1 to 24, characterized in,

The first reinforcing wire, the second reinforcing wire, the third reinforcing wire, the fourth reinforcing wire, the fifth reinforcing wire, the sixth reinforcing wire and the seventh reinforcing wire are iron wires or steel wires, and the diameter is 0.5-2.0mm.

27. The ductal inner pipe according to any of the claims 1 to 24, characterized in,

The first included angle is set as: an arcsine function value of a ratio of a thickness of the first band film to a pitch of the first reinforcing wire.

28. The ductal inner pipe according to any of the claims 1 to 24, characterized in,

The inner pipe of the air pipe is fixed by adhesion through an adhesive.

29. The ductal inner pipe according to any of the claims 1 to 24, characterized in,

The first strip-shaped film is a silver ion coating film or a bacteriostatic plastic film.

30. A polyurethane air duct is characterized in that,

Comprises an air pipe inner pipe, a polyurethane heat-insulating layer and an outer sleeve which are wrapped layer by layer from inside to outside.

31. The polyurethane air duct of claim 30,

The polyurethane heat-insulating layer is formed by injecting polyurethane between the air pipe inner pipe and the outer sleeve in a foaming mode, and is integrated with the air pipe inner pipe and the outer sleeve.

32. The polyurethane air duct of claim 30,

The polyurethane heat preservation is a prefabricated semicircular polyurethane heat preservation sleeve, the two semicircular polyurethane heat preservation sleeves are mutually spliced and assembled, and the joint is in concave-convex fit.

33. The polyurethane air duct of claim 30,

The thickness of the polyurethane heat-insulating layer is 10-100mm.

34. The polyurethane air duct of claim 30,

And spiral steel wires are wound in the outer sleeve wall or composite reinforcing ribs are wound on the outer side of the sleeve wall.

35. A polyurethane air duct according to any one of claims 30 to 34, wherein the air duct inner tube is an air duct inner tube according to any one of claims 1 to 24.