KR20170120457A - Hvac duct using vacuum insulation panel and its joint structure - Google Patents

Abstract

The present invention relates to an HVAC duct using a vacuum insulation panel, and it is an object of the present invention to provide a HVAC duct and an HVAC duct connection which satisfy a disadvantage of additionally inserting a heat insulating material into a conventional metal duct and satisfy high heat insulation performance, flame retardancy, water resistance, And to a technique for providing the same.
According to the present invention, there is provided a vacuum thermal insulation panel in which a core made of a porous material is wrapped with a sheathing material, which is a multilayer thin film having gas barrier properties, and a predetermined vacuum pressure is formed therein, The HVAC duct is formed in a tubular shape in which both ends are open.

Description

HVAC DUCT AND ITS JOINT STRUCTURE USING VACUUM INSULATING PANEL AND HVAC DUCT USING THE SAME

[0001] The present invention relates to a HVAC (Heating, Ventilation, and Air Conditioning) duct using a vacuum insulation panel, more particularly, to a HVAC duct formed by bending a vacuum insulation panel into a tubular shape, To a HVAC duct using a vacuum insulating panel to connect a HVAC duct connector satisfying high insulation performance, flame retardancy, water resistance, antimicrobiality, and workability.

In general, ducts are used to transport air, and are used primarily for ventilation and air conditioning in building equipment. The bigger the size of the building, the larger the size of the duct is made architecturally, but the duct made of brick or concrete is hardly used because of the large surface friction and the air leakage.

Thus, it is mainly made of thin metal plate, generally rectangular and circular ones are used. Ducts used in air conditioning facilities of general buildings are usually made of galvanized steel sheets. In addition, aluminum, copper, vinyl chloride, fiberglass, etc. may be used in ducts for ventilation facilities where there is a risk of corrosion in galvanized steel sheets such as kitchens, hot tubs, and bathrooms.

However, the conventional metal duct has a problem in that the workability is inconvenient because it uses a method of covering the glass wool and the heat insulating material as a secondary operation at the time of installation after the first production. In addition, since most of them are made of glass wool, they are harmful to the skin and respiratory contact with dust and fine spots.

To improve this, Korean Patent No. 10-1515265 and 10-0976079 propose an integrated foam duct with a built-in thermal insulation material. However, since it is an open cell, it is exposed to moisture and moisture, and there is a risk of exposure to bacteria. Although it has semi-fireproof performance, fire safety is deteriorated due to the generation of toxic gas in case of fire, and the insulation performance is not good. In order to compensate it, the insulation thickness must be increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method of covering a glass wool and a heat insulating material as a secondary operation This is to solve the inconvenience of poor workability. It also has a high insulation performance of less than 0.004 W / mK, reduces the construction thickness, prevents exposure by moisture, moisture or bacteria, and uses fire- It is a problem to provide an HVAC duct using such a very high vacuum insulation panel and its connection body.

In order to solve the above-described problems, an HVAC duct using a vacuum insulating panel according to the present invention comprises a core material made of a porous material, which is wrapped with a shell material, which is a multilayer thin film having gas barrier properties, and a predetermined vacuum pressure is formed inside the shell material The vacuum insulated panel is used to bend in the shape of a rectangular tube or a cylindrical tube, and the opposite sides of the tube are joined to each other so that the distal ends of both sides are opened.

Further, one or more other HVAC ducts are closely arranged on the opened end portion of the HVAC duct, and the adjacent end portions are fastened and fixed by a binding member to form a continuous HVAC duct connection body .

Since the HVAC duct using the vacuum insulation panel according to the present invention has a duct structure in which the heat insulating material is integrated, there is no need for a secondary operation for covering the heat insulating material on the outer surface of the basic duct.

In addition, it has a high level of heat insulation performance, minimizes the space area due to its low construction thickness, and is easy to move due to its small weight. It is excellent in moisture permeability, hygroscopicity, antibacterial property, There is a high safety advantage.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a diagram illustrating the formation of a rectangular or cylindrical HVAC duct using vacuum insulation panels according to the present invention.
Fig. 2 is a comparative view of an HVAC duct formed according to the present invention. Fig. 2 (a) shows a state when a groove is present, b)
3 is a view showing the optimum depth of the groove and the stretching length of the multilayer thin film,
4 is a diagram showing a correlation between the number of grooves and the round length,
5 is an exemplary view of a jig forming a groove,
6 is a view showing a bonding structure between both sides or end portions of a vacuum adiabatic panel,
FIG. 7 is an illustration of a connection structure between ducts using a coupling flange and packing with a coupling member,
8 is a view showing an example of a connection structure between ducts using a binding sheet and a fastening structure as binding members;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 illustrates forming a rectangular or cylindrical tubular HVAC duct using vacuum insulation panels according to the present invention.

As shown in FIG. 1, the tubular HVAC duct 10 (10a, 10b, 10c) according to the present invention is formed by bending a vacuum insulating panel 1 and then joining opposite sides thereof to each other. And the tubular shape may have various shapes such as a rectangular tubular shape or a cylindrical shape. For this purpose, the vacuum insulating panel 1 is made of a bendable material.

The vacuum adiabatic panel 1 is formed by surrounding the flexible core 3 with a flexible sheath 2 and forming the inside of the sheath 2 in a vacuum.

The cover material 2 is a part that surrounds the core material 3 and is preferably composed of a multilayer thin film made of an organic material so as to be bendable. That is, the shell material 2 uses the drawing characteristic inherent to the organic material, and it is most preferable that the multilayer thin film forming the shell material 2 has a thickness of 10 to 1000 mu m. If the thickness of the multilayer thin film is 10 탆 or less, vacuum damage may be caused by excessive stretching at the time of bending, and in the long term, moisture and gas blocking ability may be remarkably reduced and the durability life may be shortened. On the other hand, when the thickness of the multilayer thin film is 1000 mu m or more, the stretchability of the film deteriorates and the film is not bent or folded, resulting in deteriorated workability.

The porous core material (3) surrounded by the shell material (2) is made of a flexible material and can be bent along with the stretch of the shell material (2). However, when the porous core member 3 wrapped with the shell material 2 is bent without being deformed, HVAC ducts 10a to 10c having a rectangular tubular or cylindrical tubular structure to be produced can not be formed.

As illustrated in Fig. 2, a rectangular HVAC duct 10d having the same length of four sides will be described as an example. The circumferential length of the outer surface of the tubular HVAC duct 10d is longer than the circumferential length of the inner surface. 2 (a), when the vacuum insulating panel 1 is bent so that the other side opposite to the one side of the vacuum insulating panel 1, that is, the two sides are joined to form a cylindrical HVAC duct, Since the peripheral length and the peripheral length of the outer surface are the same, the desired cylinder shape can not be formed.

This can be solved by forming the grooves 5 on the inner surface of the vacuum adiabatic panel 1 as shown in FIG. 2 (b). The circumferential length of the inner side surface of the vacuum thermal insulating panel 1 becomes shorter by the width of the formed groove portion 5, so that a desired tubular HVAC duct can be formed

In addition, by forming the groove portion 5 on the inner side surface at the position to bend over the surface of the vacuum insulating panel 1, bending can be facilitated.

A groove portion may be formed on the inner side surface of the vacuum adiabatic panel 1 in parallel with the width direction so as to be spaced apart at regular intervals or other intervals along the length direction of the vacuum adiabatic panel.

The depth and width of the preferable groove 5 may vary depending on the thickness and the material of the multilayer thin film. However, as shown in Fig. 3, it is preferable that the depth c of the groove 5 is 70% or less of the thickness t of the vacuum thermal insulating panel 1. If the depth c of the groove 5 exceeds 70% of the thickness t of the vacuum insulation panel 1, the stretching of the multilayer thin film becomes excessive due to the pressure during the formation of the groove 5, . ≪ / RTI >

The total stretching length of the multilayer thin film formed by the formation of the groove 5 is preferably 0 to 30%. If the total stretching length exceeds 30%, the multilayer thin film may be torn or the lifetime may be deteriorated. The expression is as follows.

(1)

3, where a is the length of the vacuum insulation panel, b is the width of the groove, and c is the depth of the groove.

In order to shorten the length of the round at the position to be bent as shown in Fig. 4, it is preferable to increase the number of the grooves 5 to reduce the number of the grooves 5 and increase the length of the round. In the example of FIG. 4, when the length of the round is 1 when the groove 5 is 1, when the length of the round is 2 when the groove 5 is 2, when the length of the round is R3 when the groove 5 is 3, &Lt; R2 < R3.

In order to form the HVAC duct 10 into a cylindrical HVAC duct 10c other than a rectangular tube, the groove 5 should be formed at regular intervals. Although the number of the grooves 5 is not limited, it is preferable that the total stretching length by the formation of the grooves 5 is 0 to 30% of the inner side length (a) in the vacuum insulating panel 1. If the total stretching length exceeds 30% of the inner side length, the multilayer thin film may tear or hinder its service life

10a, 10b and 10d of the rectangular tube type are formed by forming the groove 5 on the vacuum thermal insulation panel 1, the portion to be bent of the inner side of the vacuum thermal insulating panel is formed along the longitudinal direction, (5) is added. In the case of manufacturing the cylindrical HVAC duct 10c, the groove 5 is continuously applied to the inner surface of the vacuum insulating panel at regular intervals.

5 (a), the press jig 22 is mounted on the press 21 and press-fitting is performed to the groove 21, as shown in Fig. 5 (a), because the groove 5 can be manually press- . The press 21 on which the press jig 22 is mounted moves upward and downward to adjust the depth of the groove by adjusting a predetermined lowering depth on the surface of the vacuum adiabatic panel 1 and to adjust the pressure and time. When a plurality of press jigs 22 are mounted on the press 21, a plurality of groove portions 5 may be formed at a time to increase the productivity.

5 (b), the rotary roll jig 32 is mounted on the rotating roll 31, not the press, so that the surface of the vacuum thermal insulating panel 1 is continuous The groove portion 5 can be formed and used.

The pressure applied to the vacuum adiabatic panel 1 through the jigs 22 and 32 should be 50 to 1000 kPa. When the groove 5 is formed in the vacuum adiabatic panel 1, the groove is not formed when the pressure is lower than 50 kPa through the jig 22 or 32. When the pressure is higher than 1000 kPa, (2) which maintains the vacuum of the vacuum container (1).

The material of the jig for press-fitting the groove portion 5 into the vacuum insulating panel 1 is not limited. However, since the pressure is applied at a pressure of 50 to 1000 kPa, the material should be free from deformation when used for a long time under the above-mentioned pressure.

The shape of the jig is not limited, but a "V" shape which is easiest to form the groove 5 while having the lowest elongation rate is preferable. It is preferable that the end of the jig below the "V" has round projections. This is because if the envelope material 2 of the vacuum insulation panel 1 is damaged by press-fitting, the vacuum is damaged.

If the grooves 5 are formed on the surface of the vacuum adiabatic panel 1, the molded density of the core 3 inside the vacuum insulated panel can be increased by the press-fitting. As a result, the voids inside the core (3) become small, which may lead to a reduction in thermal efficiency. Therefore, before the core material 3 is wrapped with the sheath material 2, the raw material is filled and molded so that the molding density of the core material 3 is less than 100%, then wrapped by the sheath material 2, Since the entire volume of the vacuum insulation panel 1 is reduced by pressing the vacuum insulation panel 1 after the cavity 1 is formed in the vacuum insulation panel 1, So that the density can be improved by 100%.

The groove portion 5 can be formed without directly applying the groove portion 5 on the surface of the outer cover material 2 of the vacuum insulating panel 1. [ This can be achieved by molding the core material of the porous material into a shape in which the groove 5 is pressed or by forming the grooves 5 on the surface of the core material of the porous material and then wrapping the core material with the shell material 2 of the multi- . That is, all the cavities formed in the vacuum thermal insulation panel are suitable for manufacturing the HVAC duct using the vacuum thermal insulation panel of the present invention.

In order to fabricate the HVAC duct 10 using the vacuum thermal insulation panel 1, the joining surfaces of both sides of the vacuum insulation panel 1 to which the vacuum insulation panel 1 is joined are formed as the stepped portions 1a, Or may be formed as a comb-like portion 1b as shown in Fig. 6 (b). This is because when the step portion 1a is formed on the joining side of both sides of the vacuum insulation panel 1 or when the comb corner portion 1b is formed, the area of both side joining surfaces becomes large, so that the amount of heat lost through the joining surfaces is minimized The heat insulating performance can be improved. This can be explained by the Fourier's law as shown in Equation (2) below.

(2)

(Where Q is the heat transfer amount, A is the cross-sectional area, k is the thermal conductivity, t2-t1 is the temperature difference, and L is the distance)

According to the Fourier's law of Equation (2), the amount of heat transferred is proportional to the cross-sectional area and inversely proportional to the distance with respect to the temperature gradient. That is, when the step portion 1a or the inclined comb portion 1b bent at right angles to the joining surfaces of both sides of the vacuum insulating panel 1 are formed, the area of the joining surface is increased, Performance can be improved.

As described above, the vacuum thermal insulation panel 1 having the surfaces of the step portions 1a and the comb-like corner portions 1b on the joint surfaces of both sides is obtained by machining the core member 3 to the shape, And a vacuum pressure is formed in the inner surface of the outer cover material 2. It is also possible to manufacture the surface on which the step portion 1a and the comb-like portion 1b are formed by press-fitting the joining surfaces of both sides of the vacuum insulating panel 1 with a molding press. At this time, the press-in portion of the press preferably has a curvature. If there is a sharp angle in the press-fitting portion, the cover material 2 wrapped around the vacuum thermal insulating panel 1 can be damaged. Therefore, it is preferable that the portion bent at right angles in the step portion 1a is formed so as to have a predetermined curvature and to be bent into an arc shape.

A core material 3 made of a porous material is covered with a shell material 2, which is a multilayer thin film having gas barrier properties, and a vacuum heat insulating panel 1 in which vacuum pressure is formed inside, HVAC ducts 10 are formed and one or more of the HVAC ducts 10 are connected to each other to form an HVAC duct connection body using a vacuum insulation panel which is a duct of a continuous structure.

When forming the HVAC duct connecting body using the vacuum insulating panel, it is also preferable that the distal end portion, which is a connecting portion between the ducts, is formed of a stepped portion 1a bent at a right angle at the middle or a slanting comb portion 1b . This is because, as in the joining surfaces of both sides, the joining area of the distal end portion, which is the connecting portion between the ducts, is also increased, thereby minimizing the heat loss through the joining of the distal end portions.

When the HVAC duct 10 is connected to the other end of the HVAC duct 10 using the vacuum insulation panel 1 to form the HVAC duct connector 10, Between the lugs can also be fastened and fixed by a binding member.

The binding member may be made of a plastic or metal binding structure, or may be selectively used of a rubber band, a vacuum thermal insulating panel, an organic foam or an inorganic fiber thermal insulating material.

One example of the coupling member of the HVAC duct connector connected in a continuous structure between the HVAC ducts 10 is a plastic or metal material commonly used in this technical field as shown in FIG. And a packing 42 interposed between the connection flange 41 and the fluid flange 41 so as to prevent the leakage of the fluid. It is preferable that a packing groove is formed in a region where the packing 42 is formed to prevent the packing 42 from separating and to improve airtightness.

As another example of the coupling member, there is a coupling member fixedly attached to the duct by using the binding sheet 51 and the fastening structure 52 as shown in Fig.

If a rubber band is used as the material of the binding sheet 51, the sealing effect can be further increased. In addition, if organic foam or inorganic fiber insulation is used as the binding sheet material, the amount of heat lost on the connecting portion between the ducts can be minimized, and the insulation effect can be improved. Furthermore, if the vacuum heat insulating panel is used as the binding sheet 51, the heat insulating effect can be further improved. The material of the binding sheet may optionally use one or more as required.

The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

1 - Vacuum insulation panel 1a - Step jaw
1b - comb 2 - shell material
3 - Core 5 - Groove
10 - HVAC Duct 21 - Presses
22 - Press jig 31 - Rotary roll
32 - Rotary roll jig 41 - Connecting flange
42 - packing 51 - binding sheet
52 - Fastening structure

Claims (11)

A core made of a porous material is wrapped with a casing member having gas barrier properties to bend a vacuum insulation panel in which a vacuum pressure is formed, and then joining the joining faces of both sides facing each other to form a cylindrical shape having both ends open Wherein the HVAC duct is formed by using a vacuum insulation panel.
The HVAC duct according to claim 1, wherein the cylindrical shape is a rectangular tube or a cylindrical tube.
The HVAC duct according to claim 1 or 2, wherein the outer cover material is formed of a multilayer thin film having a thickness of 10 to 1000 mu m.
The HVAC duct according to claim 1, wherein the vacuum insulation panel is formed with a groove.
The HVAC duct according to claim 4, wherein a depth of the groove portion is 70% or less of the thickness of the vacuum insulation panel.
[6] The HVAC duct according to claim 4 or 5, wherein at least one of the grooves is formed along the longitudinal direction of the vacuum adiabatic panel.
The HVAC duct according to claim 1, wherein the junction surfaces of the vacuum insulation panels are formed with a stepped portion or a slanting beveled portion with a middle portion bent at a right angle.
Cylindrical HVAC ducts having openings at both ends are formed by using a vacuum insulation panel in which a core material made of a porous material is wrapped with a shell material which is a multilayer thin film having gas barrier properties and a vacuum pressure is formed inside the HVAC duct, Are connected in series to each other to form a continuous duct. The HVAC duct connector according to claim 1,
The HVAC duct connector according to claim 8, wherein the distal end portion is formed with a stepped portion or an oblique beveled portion whose middle portion is bent at a right angle.
10. The HVAC duct connector according to claim 8 or 9, wherein connection portions of the HVAC ducts and the other end portions of adjacent HVAC ducts are connected by a coupling member.
The HVAC duct connector according to claim 10, wherein the coupling member includes at least one of a coupling structure of plastic or metal, a rubber band, a vacuum insulation panel, an organic foam or an inorganic fiber insulation material. .

Images