A sealing and heat-insulating device for air handling unit air outlet cold bridge

Abstract

The utility model discloses a kind of sealing heat preservation devices for air handling unit air port broken cold bridge, it is related to air conditioning unit field, including broken cold bridge frame section bar, reinforcing sheet metal, inner panel and outer panel, broken cold bridge frame section bar is in head-to-tail around ventilation opening, the upper and lower sides of broken cold bridge frame section bar are all set embedded groove, reinforcing sheet metal includes horizontal part, one end 90 of horizontal part Degree bending forms bending part, for inserting embedded groove inside;Sealing heat preservation device inside is provided with inner panel, outside is provided with outer panel, inner panel covers reinforcing sheet metal surface on the upper side of broken cold bridge frame section bar, outer panel covers reinforcing sheet metal surface on the lower side of broken cold bridge frame section bar, and inner panel, outer panel are fixedly connected with corresponding reinforcing sheet metal, and in the closed cavity surrounded by inner panel, outer panel and broken cold bridge frame section bar, fill foaming material.The utility model realizes the technical effect of broken cold bridge optimization on the basis of guaranteeing structural strength, sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning units, and specifically to a device for sealing and insulating the cold bridge at the air outlet of an air handling unit. Background Technology

[0002] Central air conditioning terminal air handling units are applied through modular functional section combinations. For example... Figure 3 As shown, the unit consists of a mixing section (100), a filtration section (200), and a cooling section (300) arranged in sequence to filter, cool, and dehumidify the target air. The air is then pressurized by a fan section (400) located after the cooling section and delivered to the air duct through an air outlet. The treated air may differ significantly from the ambient air in terms of temperature, humidity, cleanliness, and freshness. Terminal air handling units generally use a housing with certain sealing and insulation functions to isolate the target air from the ambient air.

[0003] The thermal insulation performance of an air handling unit's enclosure has a decisive impact on the unit's operational energy efficiency. If there is a temperature difference between the inside of the enclosure and the outside environment, and the enclosure structure contains metal components in direct contact, a significant heat conduction channel, known as a cold bridge, will be formed. This phenomenon has a double negative effect: First, based on Fourier's law of heat conduction, the heat flux density at the cold bridge location is typically 2 to 5 times that of a normally insulated area, leading to a 15% to 20% increase in cooling loss per unit area and significantly reducing the system's COP value. Second, at the high-temperature interface, when the air dew point temperature is higher than the surface temperature of the structure, condensation will occur. This not only damages the closed-cell structure of the insulation material but also provides a breeding ground for mold, resulting in excessive total bacterial counts in the indoor air and affecting environmental cleanliness.

[0004] There are two traditional structures for the air vents of terminal air handling units. One type uses an air vent flange A (1') with an inner sheet metal lining. The inner and outer sheet metal of the panel are first perforated, and then foamed to form a foam layer (5'). Since it is difficult to bend the inner sheet metal of the panel inward, another bent sheet metal is often used to seal and support the inner and outer panels, such as... Figure 4 , 5 As shown, the C-type sheet metal (2') is lined between the inner panel A (3') and the outer panel A (4'). Another form is to first foam and then open the pores, and then wrap the exposed parts of the foam material with edges for protection and reinforcement, that is, the C-type sheet metal (2') is wrapped around the inner panel A (3') and the outer panel A (4'), as shown. Figure 6 , 7 As shown, the foam layer (5') is covered with C-shaped metal sheet to ensure the structural strength of the air outlet. However, both of the above air outlet treatment methods have the problem of cold bridging. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a sealing and insulation device for the cold bridge at the air outlet of an air handling unit. It uses rigid polyvinyl chloride material and takes advantage of the low thermal conductivity of the material (approximately 0.13~0.15 W / (m•K). Compared with C-shaped metal sheet metal (approximately 50~60 W / (m•K)), it can effectively block the heat conduction path, thus achieving an optimized design of the cold bridge structure.

[0006] The purpose of this utility model is achieved through the following technical solution: This air handling unit vent cooling bridge sealing and insulation device includes a cooling bridge frame profile, reinforcing sheet metal, an inner panel, and an outer panel. The cooling bridge frame profile is connected end to end around the vent. Embedded grooves are opened on both the upper and lower sides of the cooling bridge frame profile. The reinforcing sheet metal includes a horizontal part, one end of which is bent at 90° to form a bent part for insertion into the embedded groove, so that the reinforcing sheet metal fits against the surface of the embedded groove. The sealing and insulation device has an inner panel on the inside and an outer panel on the outside. The inner panel covers the surface of the reinforcing sheet metal on the upper side of the cooling bridge frame profile, and the outer panel covers the surface of the reinforcing sheet metal on the lower side of the cooling bridge frame profile. The inner panel and the outer panel are fixedly connected to the corresponding reinforcing sheet metal, and foaming material is filled into the closed cavity formed by the inner panel, the outer panel, and the cooling bridge frame profile.

[0007] As a further technical solution, an air vent flange is installed on the outside of the air vent. The air vent flange includes a main body, with the upper end of the main body extending laterally to form an upper extension plate and the lower end of the main body extending laterally to form a lower extension plate. The lower extension plate contacts and adheres to the outer panel through a sealing and heat-insulating strip, which serves to seal and break up cold bridges.

[0008] As a further technical solution, the lower extension plate and the reinforcing sheet metal are fixed with self-tapping screws, which pass through the lower extension plate, the sealing and insulation strip, the outer panel, the reinforcing sheet metal and the foam material in sequence.

[0009] As a further technical solution, the inner panel and the reinforcing sheet metal are fixed with self-tapping screws, which pass through the inner panel, the reinforcing sheet metal and the foam material in sequence.

[0010] As a further technical solution, the thermal break bridge frame profile is made of rigid polyvinyl chloride.

[0011] As a further technical solution, polyurethane is used as the insulation layer in the foaming material.

[0012] The beneficial effects of this utility model are as follows: 1. Using rigid polyvinyl chloride with a lower thermal conductivity to make the cold bridge frame profile can effectively block the heat conduction path and realize the optimized design of the cold bridge structure. 2. The inner panel, outer panel and thermal break frame profile form a closed cavity, which can completely encapsulate the polyurethane foam material during the foaming process and effectively prevent it from overflowing. 3. By adding sheet metal reinforcement between the inner and outer panels and the thermal break frame profile, the overall structure is guaranteed to maintain its strength after the C-shaped metal sheet metal is replaced. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0015] Figure 3 This is a schematic diagram of the airflow direction in existing air handling units.

[0016] Figure 4 Schematic diagram of the existing air vent structure Figure 1 .

[0017] Figure 5 for Figure 4 A magnified view of a portion of region B in the middle.

[0018] Figure 6 Schematic diagram of the existing air vent structure Figure 2 .

[0019] Figure 7 for Figure 6 A magnified view of a portion of region C.

[0020] Explanation of reference numerals in the attached drawings: Air outlet flange A1', C-type sheet metal 2', Inner panel A3', Outer panel A4', Foaming layer 5', Mixing section 100, Filter section 200, Cooling section 300, Fan section 400; 1. Thermal bridge frame profile; 11. Embedded groove; 2. Reinforcing sheet metal; 21. Bending section; 22. Horizontal section; 3. Inner panel; 4. Outer panel; 5. Foaming material; 6. Air outlet flange; 61. Main body; 62. Upper extension plate; 63. Lower extension plate; 7. Sealing and insulation strip; 8. Self-tapping screw; 9. Ventilation opening. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings: Example: As attached Figure 1 , 2As shown, this device for sealing and insulating the cold bridge at the air outlet of an air handling unit includes a cold bridge frame profile 1, an embedded groove 11, a reinforcing sheet metal 2, a bending part 21, a horizontal part 22, an inner panel 3, an outer panel 4, foam material 5, an air outlet flange 6, a main body 61, an upper extension plate 62, a lower extension plate 63, a sealing and insulating strip 7, self-tapping screws 8, and a ventilation opening 9.

[0022] Reference Appendix Figure 1 The thermal break frame profile 1 is grounded at both ends and surrounds the ventilation opening 9 (forming a rectangle), such as... Figure 2 As shown, an embedded groove 11 is formed on both the upper and lower sides of the thermal break frame profile 1. The reinforcing sheet metal 2 has an "L"-shaped structure, including a horizontal part 22. One end of the horizontal part 22 is bent at 90° to form a bent part 21, which can be inserted into the embedded groove 11, making the reinforcing sheet metal 2 fit against the surface of the embedded groove 11. An inner panel 3 is provided on the inner side of the sealing and insulation device, and an outer panel 4 is provided on the outer side. The inner panel 3 covers the surface of the reinforcing sheet metal 2 on the upper side of the thermal break frame profile 1, and the outer panel 4 covers the surface of the reinforcing sheet metal 2 on the lower side of the thermal break frame profile 1. At the same time, the inner panel 3 and the outer panel 4 are fixedly connected to the corresponding reinforcing sheet metal 2, and the inner panel 3, the outer panel 4 and the thermal break frame profile 1 together form a closed cavity, which is filled with foam material 5. Preferably, the foam material 5 is polyurethane as the insulation layer, and is formed by high-pressure foaming to form a continuous and dense insulation layer, effectively blocking the heat transfer path.

[0023] Furthermore, an air vent flange 6 is provided on the outside of the air vent 9. The air vent flange 6 includes a main body 61. The upper end of the main body 61 extends laterally to form an upper extension plate 62, and the lower end of the main body 61 extends laterally to form a lower extension plate 63. The cross-section of the air vent flange 6 is U-shaped. The contact area between the air vent flange 6 and the outer panel 4 (i.e., the lower extension plate 63) is covered with a sealing and heat-insulating strip 7, which serves to seal and break up cold bridges.

[0024] Furthermore, such as Figure 2 As shown, the lower extension plate 63 is fixed to the reinforcing sheet metal 2 by self-tapping screws 8, which pass through the lower extension plate 63, the sealing and insulation strip 7, the outer panel 4, the reinforcing sheet metal 2, and the foam material 5 in sequence. Preferably, the inner panel 3 is also fixed to the reinforcing sheet metal 2 by self-tapping screws 8, and the self-tapping screws 8 pass through the inner panel 3, the reinforcing sheet metal 2, and the foam material 5 in sequence.

[0025] Preferably, the thermal break bridge frame profile 1 is made of rigid polyvinyl chloride.

[0026] The working principle of this utility model: During assembly, the bent portion 21 of the reinforcing sheet metal 2 is inserted into the embedded groove 11 of the thermal break frame profile 1, and the horizontal portion 22 of the reinforcing sheet metal 2 is kept in close contact with the embedded groove 11. The inner panel 3 is placed over the surface of the reinforcing sheet metal 2 (horizontal portion 22) on the upper side of the thermal break frame profile 1, and the outer panel 4 is placed over the surface of the reinforcing sheet metal 2 (horizontal portion 22) on the lower side of the thermal break frame profile 1. The inner panel 3, outer panel 4, and thermal break frame profile 1 together form a closed cavity, which is filled with foaming material 5. The polyurethane material is foamed under high pressure to form a continuous and dense insulation layer, which can effectively block the heat transfer path. The closed cavity can effectively prevent the polyurethane material from overflowing. In addition, a sealing and insulating strip 7 is applied to the contact area between the air outlet flange 6 and the outer panel 4 (i.e., the lower extension plate 63), which serves as a seal and thermal break. The lower extension plate 63 is fixed to the reinforcing sheet metal 2 by self-tapping screws 8, which pass through the lower extension plate 63, the sealing and insulation strip 7, the outer panel 4, the reinforcing sheet metal 2, and the foam material 5 in sequence. At the same time, the inner panel 3 is also fixed to the reinforcing sheet metal 2 by self-tapping screws 8, which pass through the inner panel 3, the reinforcing sheet metal 2, and the foam material 5 in sequence.

[0027] This invention combines material optimization with structural innovation, achieving optimized cold bridge technology while ensuring structural strength and sealing reliability. It is expected to reduce heat loss at the air outlet by 20% to 30% and increase the outer surface temperature of the casing by 3 to 5°C, ensuring that the temperature is above the dew point under normal humidity conditions. This avoids rust and mold problems caused by condensation accumulation, making it particularly suitable for ventilation equipment requiring high-efficiency insulation, such as central air conditioning units and modular air conditioning units, and has significant market application value.

[0028] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this utility model should fall within the protection scope of the appended claims.

Claims

1. A device for sealing and insulating cold bridges at the air outlet of an air handling unit, characterized in that: The structure includes a thermal break frame profile (1), a reinforcing sheet metal (2), an inner panel (3), and an outer panel (4). The thermal break frame profile (1) is connected end to end around the ventilation opening (9). Embedded grooves (11) are provided on both the upper and lower sides of the thermal break frame profile (1). The reinforcing sheet metal (2) includes a horizontal part (22). One end of the horizontal part (22) is bent at 90° to form a bent part (21), which is used to insert into the embedded groove (11) and make the reinforcing sheet metal (2) adhere to the surface of the embedded groove (11). The sealing and heat preservation device is provided with an inner panel (3) on the inside and an outer panel (4) on the outside. The inner panel (3) covers the surface of the reinforcing sheet metal (2) on the upper side of the thermal break frame profile (1), and the outer panel (4) covers the surface of the reinforcing sheet metal (2) on the lower side of the thermal break frame profile (1). The inner panel (3) and the outer panel (4) are fixedly connected to the corresponding reinforcing sheet metal (2), and foaming material (5) is filled into the closed cavity formed by the inner panel (3), the outer panel (4) and the thermal break frame profile (1).

2. The air outlet cold bridge sealing and insulation device for air handling units according to claim 1, characterized in that: The vent (9) is provided with a vent flange (6) on the outside. The vent flange (6) includes a main body (61). The upper end of the main body (61) extends laterally to form an upper extension plate (62). The lower end of the main body (61) extends laterally to form a lower extension plate (63). The lower extension plate (63) contacts and adheres to the outer panel (4) through a sealing and heat-insulating strip (7), which serves as a seal and a cold bridge.

3. The air outlet cold bridge sealing and insulation device for air handling units according to claim 2, characterized in that: The lower extension plate (63) and the reinforcing sheet metal (2) are fixed by self-tapping screws (8), which pass through the lower extension plate (63), the sealing and heat-insulating strip (7), the outer panel (4), the reinforcing sheet metal (2) and the foaming material (5) in sequence.

4. The air outlet cold bridge sealing and insulation device for air handling units according to claim 1, characterized in that: The inner panel (3) and the reinforcing sheet metal (2) are fixed by self-tapping screws (8), which pass through the inner panel (3), the reinforcing sheet metal (2) and the foam material (5) in sequence.

5. The air outlet cold bridge sealing and insulation device for air handling units according to claim 1, characterized in that: The thermal break bridge frame profile (1) is made of rigid polyvinyl chloride.

6. The air outlet cold bridge sealing and insulation device for air handling units according to claim 1, characterized in that: The foaming material (5) uses polyurethane as the insulation layer.

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