JP2002195635A - Insulated duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulated duct, capable of surely avoiding generation of condensation, while increasing flexibility of the same. SOLUTION: An insulating layer 3 is interposed between the tubular inside hose unit 1 and the tubular outside hose unit 2, while the outside of the insulating layer 3 is covered by a coating layer 4. The tubular outside hose unit 2 is constituted of a belt type nonwoven fabric, wound spirally under a condition that a part of the nonwoven fabric is superposed in the lengthwise direction of the hose, while adhering the superposed parts with an adhesive agent 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention transports (guides) fluid such as a drain hose and a heat insulating duct which require heat insulation of an air conditioner and a blower, as well as a heat insulating duct used for various devices.
To heat insulation ducts.

[0002]

2. Description of the Related Art As the above-mentioned heat-insulating duct, for example, a belt-like polyethylene foam is spirally wound around a tubular inner hose portion to form a heat-insulating layer, and the outside of the heat-insulating layer is made of a soft vinyl chloride resin or the like. Generally, it is configured such that the heat insulating layer can be held at that position by being covered with the covering layer made of, but can be provided with flexibility. Conventionally, by forming the inner hose portion with a nonwoven fabric made of polypropylene or the like, not only the heat insulation effect can be improved, but also the sound absorbing effect can be achieved.

[0003]

In the heat-insulating duct having the above-described structure, the heat-insulating effect on the inside of the hose can be enhanced by the inner hose portion and the heat-insulating layer, but only the outside of the heat-insulating layer is covered by the coating layer. Therefore, there is a disadvantage that dew condensation occurs on the outer surface of the heat-insulating duct, that is, on the outer surface of the coating layer, due to the moisture outside the hose adhering to the coating layer or due to a temperature difference between the inside of the hose and the outside of the hose. .

[0004] In view of the above situation, the present invention is to solve the problem by providing an insulated duct capable of reliably preventing the occurrence of dew condensation while increasing flexibility.

[0005]

The heat-insulating duct of the present invention comprises:
In order to solve the above-mentioned problems, a heat insulating layer is interposed between a cylindrical inner hose portion and a cylindrical outer hose portion, the outside of the heat insulating layer is covered with a coating layer, and the outer hose portion is a band-shaped nonwoven fabric. And the non-woven fabric is spirally wound in a state where a part of the non-woven fabric overlaps in the longitudinal direction of the hose, and the tubular outer hose portion is formed while bonding the overlapping portion using an adhesive. It is characterized by: By forming the outer hose portion from a nonwoven fabric as described above, for example, it is possible to prevent moisture existing outside the hose from being transmitted to the outer surface of the coating material due to a capillary phenomenon that spreads to every corner of a large number of fibers constituting the nonwoven fabric. And the occurrence of dew condensation can be reliably avoided. Further, even if dew condensation occurs on the outer surface of the coating layer due to the temperature difference between the inside and outside of the hose and the adhesion of moisture outside the hose, the moisture can be held in the gap between the large number of fibers. It is possible to avoid that moisture is transmitted to the portion. In addition, the non-stretchable non-woven fabric is heat-sealed to the outer surface of a stretchable coating layer made of a soft resin, for example, by unifying the overlapping portions using an adhesive while spirally winding the non-woven fabric. When the insulation duct is bent and installed, the coating layer tends to stretch, but the nonwoven fabric does not stretch at all, so the nonwoven fabric peels off from the coating layer. Although it may happen, by winding the non-woven fabric in a spiral shape as described above and integrating the overlapping parts using an adhesive, not only does not peel off by bending the hose, but also the stretch ratio is different Since the coating layer and the nonwoven fabric are not integrated, the flexibility of the heat insulating duct can be further increased.

The inner hose portion is formed by spirally winding a non-woven fabric made of a synthetic resin, and heat-sealing end outer surfaces adjacent to each other in the tube axis direction with a reinforcing core made of the same material of a synthetic resin. Thereby, the reinforcing core and the nonwoven fabric can be hardly peeled off while the shape retention of the heat insulating duct can be improved.

[0007] The heat insulating layer comprises two inner and outer heat insulating layers,
Each of those heat insulating layers is formed by spirally winding a band-shaped plastic foam or thermoplastic elastomer,
The coating layer forms the inner heat-insulating layer from between the entire outer surface of the outer heat-insulating layer and the joining surface of the plastic foams or thermoplastic elastomers that are sequentially spirally wound to form the outer heat-insulating layer. To cover at least the area that reaches at least the outer surface of the plastic foam that is sequentially spirally wound in order to form the coating layer, wherein the coating layer is heat-fusible to the outer heat-insulating layer and the inner heat-insulating layer. It is made of resin. To form the outer heat insulating layer by setting the coating layer as described above to reach at least the outer surface of the plastic foam or thermoplastic elastomer that is sequentially spirally wound to form the inner heat insulating layer. There is no gap between the joining surfaces of the plastic foams or the thermoplastic elastomers that are sequentially wound spirally, and the atmosphere in the hose toward the outer heat-insulating layer is applied to the coating layer that reaches the outer surface of the inner heat-insulating layer. Not only can it block the heat insulation, but also it can avoid the lowering of the flexibility compared to the case where the inner surface of the inner heat insulation layer is covered with the coating material. It can be held.

By forming the coating layer from a material different from that of the outer hose portion, the molten material for forming the outer hose portion may be wound on the molten material for forming the coating layer. Thus, the operations can be performed in the same operation step without being fused. In other words, if the covering layer and the outer hose portion are made of the same material, if they are performed in the same operation process, they are fused and integrated, and the flexibility is deteriorated.

[0009]

FIG. 1 is a sectional view of a heat insulating duct for an air conditioner (blower), and FIG. 2 is a sectional view of the heat insulating duct of FIG. FIG. 3 shows a sectional view of the state. The heat insulating duct includes an inner hose portion 1 for forming an inner surface of the duct, an outer hose portion 2 for forming an outer surface of the duct, an insulating layer 3 disposed between the inner hose portion 1 and the outer hose portion 2, A cover layer that covers the outside of the heat insulating layer. INDUSTRIAL APPLICABILITY The present invention can be applied to a heat insulating duct for an air conditioner (blower), and also transports (guides) a fluid such as a drain hose requiring heat insulation of an air conditioner or a blower, or a heat insulating duct used for various devices. Anything can be applied. S shown in the figure indicates the outside of the hose, and U indicates the inside of the hose.

[0010] The inner hose portion 1 is made of a fibrous product made in a cloth state, that is, a band-shaped nonwoven fabric 5 having a sound absorbing effect and made of a material such as polypropylene or polyethylene, without using means such as weaving or knitting. In the process of spirally winding the non-woven fabric 5 with a small gap therebetween, a cross-sectional shape for filling the gap between the non-woven fabrics 5 to be wound by winding from the outside and improving shape retention of the hose. It comprises a first core material 6 having a convex shape and a second core material 7 having a square cross section for maintaining the shape of the hose on the outer surface of the belt-shaped nonwoven fabric 5 substantially at the center in the longitudinal direction of the hose. The first core material 6 and the second core material 7 are made of a synthetic resin such as polypropylene or polyethylene. The first core material 6 and the second core material 7 are wound around the nonwoven fabric 5 while extruding the molten resin extruded in the shape from the molding machine to form the nonwoven fabric 5. It is designed to be fused. The first
If the material of the core material 6 and the material of the second core material 7 and the material of the non-woven fabric 5 are made the same, there is an advantage that the mutual fusion force can be increased, but different materials may be used. The inner hose portion 1 is composed of the nonwoven fabric 5 and the two core members 6 and 7. However, the inner hose portion 1 may be composed of a tubular hose portion formed by spirally extruding a band-shaped synthetic resin from a molding machine. Often, the specific configuration of the inner hose portion 1 is not limited to these.

The outer hose portion 2 is made of a band-shaped nonwoven fabric having a sound absorbing effect and made of a material such as polypropylene or polyethylene, similar to the inner hose portion 1. Are wound around the outer surface of the coating layer 4 in an overlapping state, and the overlapping portion is adhered using an adhesive 8. By forming the outer hose portion 2 from a non-woven fabric, not only can the sound absorbing effect be further enhanced by a synergistic effect with the non-woven fabric 5 positioned on the inside, but also the condensation generated on the outer surface of the coating layer 4 can be reduced by the capillary phenomenon. There are advantages that can be prevented. Further, by forming the tubular portion by bonding the overlapping portion of the nonwoven fabric 2 using an adhesive 8, a gap H is formed between the inner surface of the nonwoven fabric 2 and the outer surface of the coating layer 4 as shown in FIG. Therefore, there is an advantage that the flexibility of the heat insulating duct can be further improved.

As shown in FIG. 1 and FIG.
Is formed by spirally winding a band-shaped plastic foam made of polystyrene, polyethylene, polypropylene, or the like. By using a thermoplastic elastomer such as urethane, that is, a polymer material or synthetic rubber having a remarkable elasticity at around normal temperature instead of the plastic foam 3, it is possible to improve the strength and durability of the hose. However, there is an advantage that sufficient flexibility can be exhibited.

The coating layer 4 is made of a material different from the outer hose portion 2, such as soft polyvinyl chloride (PVC) or a thermoplastic elastomer, so that the molten material for forming the outer hose portion 2 is melted. There is an advantage that the operations can be performed in the same operation step without being fused together, even when wound around the formed material for forming the coating layer 4. In addition, since the coating layer 4 is made of a soft material as described above, not only is the point that the flexibility of the hose is improved, but also the coating layer 4 is formed on the outer surface of the heat insulating layer 3 without any gap. This has the advantage that the heat insulating effect can be enhanced, and the occurrence of dew condensation in the heat insulating layer 3 can be reliably avoided.
Forming the covering layer 4 and the outer hose portion 2 with different materials is advantageous in terms of workability.
The outer hose portion 2 and the outer hose portion 2 may be made of the same material, and may be wound in a state where the coating layer 4 is cooled to a temperature at which the outer hose portion 2 is not fused.

The method of manufacturing the heat insulating duct will be described. As shown in FIG. 4A, the nonwoven fabric 5 is spirally wound around a rotating body (also referred to as a homer) K which is driven and rotated. Next, as shown in FIG. 4 (b), each of the synthetic resins (about 200 ° C.) 9 and 10 for forming the two types of cores 6 and 7 was extruded from the extruder (not shown) to the nonwoven fabric. The synthetic resin 9, 10 is heat-fused onto the non-woven fabric 5 on the rotating body K at a predetermined distance from the non-woven fabric 5. Subsequently, as shown in FIG. 5 (a), the plastic foam 3,
A tape-shaped coating layer 4 (about twice the width of the plastic foam) made of synthetic resin at about 200 ° C. is wound in order from an extruder (not shown) to form the coating layer 4 and the plastic foam 3 in contact therewith. The outer surface is prevented from being heat-sealed to form a gap inside the plastic foam 3. Subsequently, as shown in FIG. 5 (b), two nonwoven fabrics 2, 2 in a state of being partially overlapped in the width direction (may be about half) are wound from above the coating layer 4 and the polymerized portion is removed. The heat insulating duct is formed by bonding with an adhesive (not shown).

As shown in FIG. 6, the heat insulating layer 3 is
It may be composed of two heat insulation layers 11 and 12, or may be composed of three or more heat insulation layers, not shown. FIG.
Then, an inner heat-insulating layer 11 formed by spirally winding a strip-shaped plastic foam made of polystyrene, polyethylene, polypropylene or the like, and the inner heat-insulating layer 11
And an outer heat-insulating layer 12 formed by spirally winding a plastic foam made of the same material as the plastic foam. And the outer heat insulating layer 1
Joining surface 1 of plastic foams which are sequentially spirally wound to form the entire outer surface and outer heat insulating layer 12
The covering layer 4 covers a range extending from the area between 2A and 12A to the entire area (total) of the joining surfaces 11A and 11A of the plastic foams which are sequentially spirally wound to form the inner heat insulating layer 11. As a result, the two heat insulating layers 11,
12 can be kept in a position-holding state,
By dividing the heat insulating layer 3 into a number of rooms along the pipe axis direction, the heat insulating effect can be improved. The covering layer 4 is formed by joining the plastic foams 11
Along the entire area (entire area) of A and 11A is effective in reliably increasing the heat insulating effect, but the coating layer 4 is applied only to a part of the joining surfaces 11A and 11A between the plastic foams 11 and 11. It may be arranged. The other components shown in FIG. 6 are the same as those shown in FIG. 1, and therefore are denoted by the same reference numerals and description thereof will be omitted.

In FIG. 6, the covering layer 4 is also inserted into the joining surfaces 11A, 11A of the plastic foams 11, 11 so that, for example, when the hose is curved to follow a curved path, the joining is performed. Surface 11A, 11
Although there is an advantage that it is possible to avoid generation of a gap between A, as shown in FIG. 7, the coating layer 4 is configured to be heat-sealed only on a part of the outer surface 11 </ b> B of the plastic foam 11. Is also good. In this way, by heat-sealing the coating layer 4 only on a part of the outer surface 11B of the plastic foam 11, a decrease in the flexibility of the heat insulating duct can be suppressed. Outer surface 11B
The heat insulation effect may be enhanced by heat-sealing the entire area (entire area). The other components shown in FIG. 7 are the same as those in FIG. 1, and therefore are denoted by the same reference numerals and description thereof will be omitted.

[0017]

According to the first aspect of the present invention, by forming the outer hose portion from a nonwoven fabric, the occurrence of dew condensation on the outer surface of the coating layer can be prevented by the capillary phenomenon that spreads to every corner of a large number of fibers constituting the nonwoven fabric. In addition, even if dew condensation occurs on the outer surface of the coating layer, the moisture can be retained in the gaps between the plurality of fibers, so that moisture is transmitted to other portions. Can be avoided. Therefore, it is possible to provide a heat-insulating duct capable of reliably preventing the occurrence of dew condensation while using a nonwoven fabric to increase flexibility. In addition, the non-stretchable non-woven fabric is heat-sealed to the outer surface of a stretchable coating layer made of a soft resin, for example, by unifying the overlapping portions using an adhesive while spirally winding the non-woven fabric. In the case of heat insulation ducts that are fixed by using adhesives or adhesives, the nonwoven fabric does not peel off from the coating layer, and it can be used well over a long period of time, and the coating with different stretch ratios Since the layer and the nonwoven fabric are not integrated, the flexibility of the heat insulating duct can be further increased, which is advantageous in terms of construction.

According to the second aspect of the present invention, while the inner hose portion is spirally wound with a synthetic resin non-woven fabric, the end outer surfaces adjacent to each other in the tube axis direction are heated by a reinforcing core made of the same material synthetic resin. By forming by fusion, the reinforcing core and the non-woven fabric can be hardly peeled off while the shape-retaining property of the heat-insulating duct can be enhanced, which is advantageous in terms of durability.

According to claim 3, the outer layer is set by setting the covering layer to reach at least the outer surface of the plastic foam or the thermoplastic elastomer which is sequentially spirally wound to form the inner heat insulating layer. There is no gap between the joining surfaces between the plastic foams or the thermoplastic elastomers that are sequentially spirally wound to form the heat insulating layer, and the atmosphere in the hose toward the outer heat insulating layer is reduced by the inner heat insulating layer. Not only can it be cut off by the coating layer reaching the outer surface, but also the inner surface of the inner heat insulating layer can be prevented from being reduced in flexibility as compared with the case where the inner surface is covered with the coating material. Since the position of the heat insulation layer can be reliably maintained, for example, when the hose is bent, it is possible to maintain a good bending posture without collapsing, and Together becomes Oite Advantageously, sufficiently to exhibit the sound absorbing effect that it is possible to suppress the sound to the outside leaks, it becomes advantageous when used as a duct, particularly for air conditioners.

According to the fourth aspect, the coating layer is formed of a material different from that of the outer hose portion, so that the molten material for forming the outer hose portion is wound on the molten material for forming the coating layer. Even if they are made to work, they can be worked in the same work process without being fused, so that the workability can be improved while the flexibility can be improved. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a heat insulating duct.

FIG. 2 is a cross-sectional view showing a state in which a gap is provided between members of the heat insulating duct of FIG.

FIG. 3 is a cross-sectional view of a main part showing a gap between an outer hose part and a coating layer.

FIG. 4 (a) is an explanatory view showing a state where a nonwoven fabric is wound around a rotating body, and FIG. 4 (b) is an explanatory view showing a state where two kinds of core materials are wound from above the nonwoven fabric.

FIG. 5A is an explanatory view showing a state in which a plastic foam and a coating layer are wound in this order from two types of core materials,
(B) is explanatory drawing which shows the state which winds two nonwoven fabrics from a coating layer.

FIG. 6 is a cross-sectional view showing a main part of another heat-insulating duct configured with two heat-insulating layers, inner and outer.

FIG. 7 is a cross-sectional view showing a main part of the heat-insulating duct in which the covering layer shown in FIG. 6 covers different areas.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner hose part 2 Outer hose part (nonwoven fabric) 3 Heat insulation layer (plastic foam) 4 Coating layer 5 Nonwoven fabric 6 1st core material 7 2nd core material 8 Adhesive 9,10 Synthetic resin 11,12 Insulation layer 11A, 12A Joint surface H Clearance K Rotating body S Outside hose U Inside hose

Claims (4)

[Claims] A heat insulating layer is interposed between a cylindrical inner hose portion and a cylindrical outer hose portion, the outside of the heat insulating layer is covered with a coating layer, and the outer hose portion is formed of a band-shaped nonwoven fabric. The non-woven fabric is wound spirally with a part thereof overlapping in the longitudinal direction of the hose, and the tubular outer hose portion is formed while bonding the overlapping portion with an adhesive. And heat insulation duct. 2. The inner hose portion is heat-fused with a reinforcing core made of a synthetic resin of the same material, while spirally winding a non-woven fabric made of a synthetic resin on the inner hose portion and adjoining the outer surfaces of the end portions adjacent in the tube axis direction. The heat insulating duct according to claim 1, wherein the heat insulating duct is constituted. 3. The heat-insulating layer comprises two inner and outer heat-insulating layers, each of which is formed by spirally winding a belt-shaped plastic foam or thermoplastic elastomer, and wherein the coating layer is formed by the outer heat-insulating layer. To form the inner heat insulating layer sequentially from between the joining surfaces of the plastic foams or thermoplastic elastomers which are sequentially wound spirally to form the entire outer surface and the outer heat insulating layer. Claims: It is comprised from what covers at least the area | region which reaches the outer surface of the plastic foam which is turned, The said coating layer is comprised by the olefin resin which can be heat-sealed with respect to the said outer heat insulation layer and the inner heat insulation layer. 2. The heat-insulating duct according to 1. 4. The heat insulating duct according to claim 1, wherein the coating layer is formed of a different material from the outer hose portion.