JP2002039605A - Double pipe ventilation duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double pipe ventilation duct to reduce cost and have an energy saving type heat exchange function without using power. SOLUTION: A double pipe ventilation duct consists of an outer duct 1 and an inner duct 2 to form an outer ventilation passage 11 between the outer and inner ducts, and has its own internal part forming an inner ventilation passage 21. The double pipe ventilation duct comprises the outer duct 1 on which heat insulation processing is applied by using a heat insulation material 12; the inner duct 2 consisting of a spiral pipe forming a pipe formed that the two ends on both sides of a thin belt-form aluminum sheet are bent, the two ends on both sides are joined together by caulking as the sheet is spirally wound, and the sheet forms one continuous pipe as a flat seam part 22 is formed on an outer peripheral surface; a spiral fin 23 formed that one side end of the thin belt-like aluminum sheet is nipped between the sheets of the flat seam part 22, and the other side end is erected from the outer peripheral surface of the inner duct 2; and a spacer 3 to hold the outer and inner ducts 1 and 2 with a given distance provided therebetween.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a double pipe ventilation duct having a heat exchange function.

[0002]

2. Description of the Related Art When exhausting air from indoor air-conditioned rooms,
A laminated honeycomb type or kraft type countercurrent or crossflow type total heat exchanger for effectively recovering both the sensible heat and the latent heat of the exhaust gas is known.

[0003]

When the above-described total heat exchanger is installed, a high heat recovery rate can be obtained and a great effect can be obtained. However, the heat exchanger has a built-in air supply / exhaust fan, and is large. Power is also required. An object of the present invention is to provide a double pipe ventilation duct having an energy-saving heat exchange function that does not use power while reducing costs.

[0004]

According to a first aspect of the present invention, there is provided an inner duct in which an outer air passage is formed between an outer duct and an inner duct inside the outer duct, and an inner air passage is formed in the inner duct itself. In a double-pipe ventilation duct consisting of: an outer duct whose outer peripheral surface is subjected to heat insulation treatment, and both side ends of a thin strip-shaped metal plate having thermal conductivity are bent, and both side ends are spirally wound while both ends are bent. An inner duct comprising a spiral tube which is swaged and formed as a single continuous tube while forming a spiral upright portion on the outer peripheral surface, and a spacer which holds the outer duct and the inner duct at predetermined intervals. It is a double pipe ventilation duct characterized by the following.

In this invention, the outer duct is made to have heat insulation, the inner duct is made of a heat conductive metal spiral duct, and the seam of the outer duct is made up. The heat exchange between the supply and exhaust air to and from the air passage is effectively performed at the body portion and the upright portion of the inner duct. In addition, energy is saved because no power is used.

According to a second aspect of the present invention, there is provided a double pipe comprising an outer duct and an inner duct which forms an outer air passage between the outer duct and the inner duct, the inner duct of which forms an inner air passage. In the ventilation duct, both ends of the outer duct and the metal plate having heat conductivity in the form of a thin strip are bent and the both ends are crimped while being spirally wound, and the outer periphery is subjected to heat treatment on the outer peripheral surface. An inner duct consisting of a spiral tube formed as a single continuous tube while forming a spiral flat part, and one end of a thin strip-shaped metal plate having thermal conductivity is placed between the flat plate parts. A double-pipe ventilation duct, comprising: a spiral fin sandwiched and having the other end rising from the outer peripheral surface of the inner duct; and a spacer for holding the outer duct and the inner duct at a predetermined interval. It is.

In this invention, the outer duct is provided with heat insulation, the inner duct is a spiral duct made of a metal plate having heat conductivity, and the helical portion of the spiral duct made of a metal plate having heat conductivity is provided. Since the fins are provided, heat exchange between supply and exhaust air between the outer air passage and the inner air passage is effectively performed by the body of the inner duct and the fin. In addition, since no power is used, energy is saved, and the addition of spiral fins can be performed with a slight modification of the conventional spiral duct manufacturing apparatus, which is extremely economical.

According to a third aspect of the present invention, the heat conductive metal plate comprises:
The double duct ventilation duct according to claim 1 or 2, wherein the duct is a plate made of aluminum or an aluminum alloy.

In this invention, the heat conductive metal plate is a plate made of aluminum or an aluminum alloy having a high heat conductivity.
The heat exchange between the supply and exhaust air is more effectively performed. Further, the workability during the production of the duct is improved, the weight is reduced as compared with the zinc-plated iron plate, and the cost is slightly increased.

According to a fourth aspect of the present invention, the spacer is provided with guide vanes for directing the airflow of the outer air passage to the outer peripheral surface of the inner duct. Is a double pipe ventilation duct.

In this invention, since the spacer is provided with the guide vanes for directing the airflow in the outer ventilation path to the outer peripheral surface of the inner duct, in addition to the function and effect of any one of claims 1 to 3, the outer ventilation is provided. The heat exchange between the supply and exhaust air between the passage and the inner ventilation passage is more effective.

According to a fifth aspect of the present invention, a water-permeable material that circulates between the plates of the fly portion and communicates between the outer ventilation passage and the inner ventilation passage is incorporated in the fly portion. A double pipe ventilation duct according to any one of claims 1 to 4.

[0013] In this invention, a water-permeable material that circulates between the plates of the bulge portion and communicates between the outer ventilation path and the inner ventilation path is incorporated, so that any one of claims 1 to 4 is provided. In addition to the effects of the above, since the moisture in the supply and exhaust air can move between the inside and outside air passages, the latent heat is also exchanged. The incorporation of a water-permeable material into the head is very economical as it can be carried out with a slight modification of the conventional spiral duct making equipment.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of the double pipe ventilation duct of the present invention. Double duct ventilation duct is the outer duct 1
And an outer air passage 11 between the inner duct and the outer duct 1.
, And the inside of itself comprises an inner duct 2 forming an inner air passage 21. Each of the outer duct 1 and the inner duct 2 is a spiral tube having a circular cross section. The outer peripheral surface of the outer duct 1 is subjected to a heat retaining process such as flocking or glass wool coating to form a heat retaining material layer 12.

The inner duct 2 is formed by crimping a thin band-shaped plate made of aluminum or aluminum alloy on both sides while spirally winding the plate, and has a spiral flat portion 22 on the outer peripheral surface.
And a spiral tube formed as one continuous tube while forming a flat plate. One side end of a thin band-shaped plate made of aluminum or an aluminum alloy is sandwiched between the plates of the flattened portion 22. The other end of the plate is erected from the outer peripheral surface of the inner duct 2 to form a spiral fin 23.

The spiral tube itself is manufactured by a known method. For example, after bending one side end of a thin strip plate into a U-shape and the other end into an L-shape between the rolls, the two bent ends are fitted together while being wound in a spiral shape, and the portion is moved up and down. The rolls are sequentially pressed to form one continuous tube while forming the flat part 22.

At the time of this crimping, when one side end of another thin strip-shaped plate is inserted so as to be in contact with the outside of the U-shaped bent side end, the portion is sandwiched by the flat barb portion 22. . Next, when the plate inserted by inserting a spatula or the like from the other end of the plate is erected, a spiral fin 23 as shown in an enlarged manner in FIG. 2 is formed.

Further, when forming the flattened portion 22, U
After covering the side end bent in a shape with a water-permeable material such as a band-shaped nonwoven fabric, woven cloth, paper, felt, etc., the side end and the side end bent in an L shape are fitted and the place is sequentially formed. When crimped, as shown in an enlarged manner in FIG. 3, a water-permeable material 24 that circulates between the plates of the flattened portion 22 and communicates between the outer air passage 11 and the inner air passage 21 is incorporated.

The flat fin portion 22 has a spiral fin 23.
In order to add the water-permeable material 24 to the conventional spiral duct manufacturing apparatus, only the plate supply equipment for the fins 23 and the equipment for erecting the plate and the water-permeable material 24 supply equipment need to be incorporated. The remodeling does not change the processing time.

FIG. 4 is a perspective view showing an example of the spacer 3 for holding the outer duct 1 and the inner duct 2 at a predetermined interval. The spacer 3 is a ring having a triangular cross section formed from a band-shaped metal plate, and three apexes thereof are in contact with the inner surface of the outer duct 1.
The outer circumference is being held. And at both ends of the three sides,
Guide blades 31 are provided for directing the airflow of the outer ventilation path 11 to the outer peripheral surface of the inner duct 2. The spacer 3 of this example
Is in close contact with the inner duct 2 over a large area, and the guide vane 31 has a large contact area with the airflow of the outer ventilation passage 11, so that heat exchange is effectively performed. This spacer 3 is also preferably made of aluminum or an aluminum alloy.

FIG. 5 is a cross-sectional view of the inner duct 2 which shows another example. In the above-described example, the barb is a flat bar parallel to the peripheral surface of the inner duct, and one end of the fin 23 is clamped to the flat bar 22. After bending one side end of the thin strip-shaped plate into a U-shape and the other end into an L-shape between the rolls, the two bent ends are fitted together while being wound in a spiral shape, and the part is vertically moved. Instead of successively pressing with rolls, successively pressing with rolls provided on the left and right,
A continuous tube of books. At this time, if pressure bonding is performed in a state where the end surfaces of both side ends are engaged with each other as shown in the figure, separation of both side ends can be prevented, and the strength of the upright portion 25 increases. Moreover, in this example, even if the above-mentioned fins 23 are omitted, effective heat exchange can be performed in the upright portion 25. Also in this example, as shown in FIG. 6, a water-permeable material 24 that circulates between the plates of the upright portion 25 and communicates between the outer air passage 11 and the inner air passage 21 can be incorporated.

In the above-described example, both the outer duct and the inner duct of the double pipe ventilation duct use a spiral pipe having a circular cross section. However, the outer duct may be a flange-connected circular duct or a square duct. It is possible to implement the present invention even if the inner duct is a square tubular spiral duct. In addition,
Usually, the inner air passage is used for air supply and the outer air passage is used for exhaust air, but vice versa.

In the above-described example, the inner duct and the fins are made of aluminum or an aluminum alloy plate. A thermally conductive metal plate for the duct can be used.

[0025]

According to the first aspect of the present invention, the outer duct is made to have heat insulation, the inner duct is made of a metal spiral duct having thermal conductivity, and the seam is made upright. The heat exchange between the supply and exhaust air between the outer air passage and the inner air passage is effectively performed at the body portion and the upright portion of the inner duct. Also,
Since no power is used, energy is saved.

According to the second aspect of the present invention, the outer duct is provided with a heat insulating property, the inner duct is a spiral duct made of a metal plate having heat conductivity, and the bulge portion is made of a metal plate having heat conductivity. Since the spiral fins are provided, heat exchange between supply and exhaust air between the outer air passage and the inner air passage is effectively performed by the body of the inner duct and the fin. In addition, since no power is used, energy is saved, and the addition of spiral fins to the fly can be carried out with a slight modification of a conventional spiral duct manufacturing apparatus, which is extremely economical.

According to a third aspect of the present invention, the heat conductive metal plate is a plate made of aluminum or an aluminum alloy having a high thermal conductivity.
In addition to the effects described above, the heat exchange between the supply and exhaust air is more effectively performed. Further, the workability during the production of the duct is improved, the weight is reduced as compared with the zinc-plated iron plate, and the cost is slightly increased.

According to the fourth aspect of the present invention, since the spacer is provided with the guide vane for directing the airflow of the outer ventilation path to the outer peripheral surface of the inner duct, in addition to the effect of any one of the first to third aspects, The heat exchange between the supply and exhaust air between the outer air passage and the inner air passage becomes more effective.

According to the fifth aspect of the present invention, a water-permeable material that circulates between the plates of the fly portion and communicates between the outer ventilation path and the inner ventilation path is incorporated. Or 1
In addition to the effect of the item, since the moisture in the supply / exhaust can move between the inside and outside air passages, the latent heat is also exchanged. In addition, the incorporation of the water-permeable material into the bulge is very economical because it can be carried out with a slight modification of a conventional spiral duct manufacturing apparatus.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a double pipe ventilation duct of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a fin is formed on a flat portion of an inner duct.

FIG. 3 is a cross-sectional view showing a state in which a water-permeable material is incorporated into a flat part.

FIG. 4 is a perspective view showing an example of a spacer.

FIG. 5 is a cross-sectional view of an upright portion of an inner duct.

FIG. 6 is a cross-sectional view showing a state in which a water-permeable material has been incorporated into the standing fly portion.

[Explanation of symbols]

1 is an outer duct, 2 is an inner duct, 3 is a spacer, 11 is an outer air passage, 12 is a heat insulating material layer, 21 is an inner air passage, 22 is a flat part, 23 is a fin, 24 is a water-permeable material, 25 A hammer section and 31 are guide vanes.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Hamada 1-19-16 Kamiitabashi, Itabashi-ku, Tokyo Inside Funena Cross Co., Ltd. (72) Inventor Yu Ishii 2-18-18 Yanagizaki, Kawaguchi-shi, Saitama Hirouchi (72) Inventor Masaki Sakakura 8-7-16 Iriya, Adachi-ku, Tokyo F-Term (in reference) 3L080 AA02 AB08 AD01 AD04

Claims (5)

[Claims] 1. A double-pipe ventilation duct comprising an outer duct and an inner duct forming an outer ventilation path between the outer duct and the outer duct inside the outer duct.
(B) an outer duct whose outer surface is heat-treated, and (b)
Both side edges of a thin strip-shaped metal plate having thermal conductivity are bent, and both side edges are caulked while being spirally wound,
(C) an inner duct consisting of a spiral tube formed as a single continuous tube while forming a spiral upright portion on the outer peripheral surface;
A double pipe ventilation duct comprising: a spacer for holding an outer duct and an inner duct at a predetermined interval. 2. A double pipe ventilation duct comprising: an outer duct; and an inner duct which forms an outer air passage between the outer duct and the inner duct, wherein the inner duct itself forms an inner air passage.
(B) an outer duct whose outer surface is heat-treated, and (b)
Both side edges of a thin strip-shaped metal plate having thermal conductivity are bent, and both side edges are caulked while being spirally wound,
An inner duct consisting of a single continuous spiral pipe forming a spiral flat part on the outer peripheral surface, and (c) one side end of a thin strip-shaped metal plate having thermal conductivity are formed by the flat end. A spiral fin sandwiched between the plates of the bulge portion and having the other end raised from the outer peripheral surface of the inner duct; and (d) a spacer for holding the outer duct and the inner duct at a predetermined interval. A double pipe ventilation duct characterized by the above-mentioned. 3. The double pipe ventilation duct according to claim 1, wherein the heat conductive metal plate is a plate made of aluminum or an aluminum alloy. 4. The double pipe according to claim 1, wherein the spacer is provided with guide vanes for directing an airflow of an outer ventilation path to an outer peripheral surface of the inner duct. Ventilation duct. 5. A water-permeable material, which circulates between the plates of the fly portion and communicates between the outer ventilation passage and the inner ventilation passage, is incorporated in the fly portion. Item 6. A double pipe ventilation duct according to any one of Items 4.