Install Ventilation Duct

Install Ventilation Duct Ventilation duct mainly refers to the ventilation duct of central air conditioning system, which we often ignore it, but it is an important part of air conditioning system. It is a kind of metal or composite pipe for ventilation and air conditioning engineering of industrial and civil buildings. It is a municipal infrastructure to make the air circulate and reduce the concentration of harmful gases.

Classification of Usage

Divided into: supply and return air pipe of the purification system, ventilation pipe of central air conditioning, industrial supply, and exhaust air pipe, suction and exhaust air pipe of the environmental protection system, mine gas drainage pipe, mine rubber-coated cloth air duct, etc. Install Ventilation Duct

Classification of Shape

Dividido en: conducto redondo, rectangular, conducto en espiral. Install Ventilation Duct

Clasificación de la tecnología de procesamiento

Divided into: angle iron flange duct, TDF flange duct. Install Ventilation Duct

Solicitud

The air duct is mainly used in industrial and construction engineering, and its application fields mainly involve: purification system of the dust-free workshop in electronic industry, purification system of the aseptic workshop for medicine and food, central air conditioning system of hotels, shopping malls, hospitals, factories and office buildings, exhaust duct for dust removal, smoke extraction and oil absorption in industrial pollution control, supply duct for the industrial environment or post comfort, air duct for air-conditioning, air-conditioning system for air-conditioning and air-conditioning Gas drainage system for coal mine gas drainage, air supply and return system for coal mine environment control, etc. Install Ventilation Duct

Construcción de conductos de aire

1. For more complex civil buildings, in the design stage, each type of work (HVAC, water supply and drainage, power supply and lighting, and Architecture) should first negotiate the space separation, and determine the elevation range of each kind of pipe. In general, they should not go beyond the limits set for themselves. In case of the crossing of individual pipe sections, it is necessary to negotiate with other projects. Install Ventilation Duct
2. The principle to solve the collision and coordination of various ventilation pipes is generally: “small pipes give way to large pipes, and pressure gives way to no pressure”. For example, if the water pipe collides with the air pipe, the water pipe should be turned. If the cold and hot water pipes collide with the downpipe, the cold and hot water pipes should be changed. Install Ventilation Duct
3. Before construction, the Engineer in charge of the main equipment shall draw the pipelines and single lines of each type of work on a plan. One-color pen for each type of pipe. Integrate the elevation of each intersection to see if there is any contradiction, find it in time, and solve the problem before installation. Install Ventilation Duct
4. In order to reduce investment, save space and reduce floor height, some pipes without slope requirements can be laid through beams (such as water pipes, fire spray pipes, etc.). Install Ventilation Duct

Problemas comunes de la instalación de conductos de aire

• El material no cumple con los requisitos de calidad.

This kind of problem is a headache. If the material does not meet the requirements, the air duct will leak when the system is running, which will cause the loss of air conditioning load and affect the service life of the air duct. Install Ventilation Duct

• Ruido en el conducto

Este fenómeno puede ser causado por una superficie irregular, un grosor desigual, una muesca obvia, una grieta, un agujero de arena, una cicatriz y corrosión de la placa, o el hundimiento plano del conducto de ventilación, el lado que sobresale hacia afuera y una deformación obvia.

• The warping angle, twist and elbow angle of ventilation duct are not accurate Install Ventilation Duct

This is due to the inaccurate setting out of plate cutting; The length and width of the sheet metal on the opposite side are not equal; The width of the undercut at the four corners of the ventilation duct is not equal; The setting position of bite seam is wrong, and the force of manual bite seam is different; Taking no corresponding reinforcement measures. In this case, the relative plane of the rectangular duct is not parallel, and the two ends are not parallel; The angle is not straight; The diagonals are not equal; Install Ventilation Duct

The bite is not tight. The final direct result is that the air duct connection is uneven, the installed air duct is not straight, the flange gasket is not tight, the system air leakage, resulting in air conditioning load loss, and shortens the service life. Install Ventilation Duct

Precauciones para la instalación de conductos de aire

1. Verifique la calidad de los materiales antes de la instalación.

Carefully measure the thickness of the steel plate. Before the installation of the air duct, the factory certificate and material quality certificate of the material must be checked first, and then the appearance of the material must be checked; Then measure the thickness of the steel plate. Prevent rework due to non-conforming materials. Install Ventilation Duct

2. Debe garantizarse la seguridad de la elevación

The hoisting of the clean air duct is the same as that of the ordinary ventilation duct, and the suspender, cross arm, expansion bolt, and lower skid of the insulation air duct are required to meet the relevant specifications and quality acceptance standards. Install Ventilation Duct

3. Preste atención para desplegar los pasos de supresión.

The construction personnel should strictly check the sheet metal, and control the length, width, and diagonal of each sheet metal within the allowable range; After blanking, the two sheets on the opposite side of the air duct should overlap to check the accuracy of the size; The reserved size of sheet bite must be correct to ensure the same width of bite; The biting seam sets at the four corners. When the biting seam is closed by hand, the center of both ends of the biting seam shall be tightened with a wooden hammer, and then the biting seam shall be uniformly compacted along the whole length. Install Ventilation Duct

4. Realice un buen trabajo de inspección de fugas de luz

After the ventilation duct assembles on the ground, the light leakage inspection should carry out before the heat preservation. According to the site conditions, the light leakage inspection can be carried out according to the internal or external light leakage, and the sealant shall be added at the light leakage, and the heat preservation can be carried out only when there is no light leakage. Install Ventilation Duct

5. Prueba de fuga de aire

For the supply and return air main pipe and branch pipe of purification system with higher grade, besides light leakage inspection, air leakage test shall be conducted after ground assembly. For the smaller system, it can be tested after the installation of the air duct, and for the larger system, it can be carried out after the segmented assembly on the ground as far as possible, so as to find problems and deal with them in time. Install Ventilation Duct

6. El material del cojín debe seleccionarse bien.

The gasket at the flange connection of the ventilation duct shall be made of airtight, dust-free, elastic, and non-aging materials, such as closed cell sponge rubber plate, soft rubber plate, etc. the thickness of the gasket shall be 5-8mm. The joint shall be processed into ladder shape, and direct butt joint is strictly prohibited. Install Ventilation Duct

Se puede resumir en una oración, cómo instalar correctamente el conducto de aire es extremadamente importante, a continuación se describen algunas de las instalaciones de conductos de aire en pasos detallados más completos, reduzca la pérdida causada por problemas de instalación.

• Asegúrese de que los trabajos de cimentación se completen antes de la instalación

The installation of the ventilation duct must be carried out after the completion of these foundation works; Before installation, the appearance quality shall be inspected, and the dust on the inner and outer surface and the debris in the pipe shall be removed. Install Ventilation Duct

● Conducto de ventilación prefabricado

Si no se va a instalar temporalmente, no se debe colocar a voluntad. Todos los orificios de las tuberías deben envolverse con un paño de plástico y apilarse en el interior de acuerdo con el número de sistema en la medida de lo posible. Si las condiciones no lo permiten, debe apilarse al aire libre y prestar atención para colocar la madera del cojín debajo del conducto de aire, y debe haber medidas confiables de refugio a prueba de lluvia, arena a prueba de viento y protección solar arriba.

● Limpiar el conducto de ventilación

El conducto de aire debe limpiarse con un detergente neutro que no tenga corrosión en la superficie del tablero, que no tenga polvo después del secado y que no dañe el cuerpo humano. Primero, limpie con una solución limpiadora, luego limpie con agua limpia y finalmente limpie la marca de agua con un paño blanco limpio. Si no está instalado, por el momento, también se puede secar de forma natural, pero después del secado, se debe sellar la salida de aire.

● Mantenga el conducto de ventilación limpio y ordenado.

El personal de instalación debe usar ropa de trabajo, guantes y zapatos de trabajo limpios. El conducto de aire y sus componentes que se hayan limpiado y sellado no se deben desmontar antes de la instalación. Al instalar, retire la película de sellado del extremo y luego conecte el conector; Si hay una pausa en el medio de la instalación, se debe volver a sellar el puerto para garantizar la purificación del sistema de aire acondicionado.

● No se deben colocar otras tuberías en el conducto de ventilación.

La línea eléctrica del ventilador de flujo axial, electric heater, and other equipment installed in the ventilation duct system shall be protected and insulated. The fixed cable of the outdoor riser is strictly prohibited to be pulled on the lightning rod or lightning protection network. When the air duct passes through the wall or floor, it shall not be installed in the wall or floor.

The distance between the air duct and the wall should not be less than 200 mm, and the distance between the air duct and the floor should not be less than 150 mm. When the air duct passes through the fireproof and explosion-proof floor or wall that needs to be closed, the embedded pipe or protective sleeve with the wall thickness of not less than 1.6 mm shall be set, and the flexible material that is non-combustible and harmless to the human body shall be used between the air duct and the protective sleeve.

• La instalación del conducto de ventilación debe cumplir con los requisitos de diseño.

The location of the reserved holes in the building structure should be correct, and the holes should be more than 100 mm larger than the outside size of the air duct. The connection interface between the air duct and the air duct of the building structure should be inserted along the airflow direction, and sealing measures should be taken. Flexible short pipe with a length of 150-300 mm shall be set at the joint of the ventilation duct and fan, fan case, air handling machine, etc., or according to the design requirements.

The flexible short pipe should not be used as reducing connecting pipe for alignment and leveling. The length of the flexible short pipe located in the structural deformation joint should be more than 100 mm larger than the width of the deformation joint. The installation slope of the air duct conveying condensate or moisture vapor shall meet the design requirements. It is not suitable to set longitudinal joint at the bottom of air duct, and the joint of air duct should be sealed.

• Conexión de la brida del conducto de ventilación

El material de la junta debe usarse en lugar de papel grueso, cartón, cuerda de asbesto, fibra de cáñamo con aceite de plomo y papel de linóleo. La junta del material de la junta se reducirá en la medida de lo posible. La junta del material de la junta se conectará en forma trapezoidal o de espiga y se pegará firmemente. El ancho del material de la junta después de que la brida se comprime uniformemente debe estar al mismo nivel que la pared interior del conducto de aire. La unión entre el conducto de aire y la estructura del cerramiento, como el cielo raso y la pared divisoria de la sala limpia, debe ser hermética.

• El sistema de conductos de ventilación debe tener buenas medidas de conexión a tierra.

Al pasar por la sala de producción auxiliar, debe ser hermética y no se debe configurar ninguna interfaz. Cuando la temperatura del aire de transporte es superior a 80 ℃, se deben tomar medidas de protección para el conducto de aire de acuerdo con las regulaciones de diseño. El orificio de medición del conducto de aire se colocará en la posición conveniente para la medición y observación; Para el orificio de medición en el conducto de aire en el techo, la placa de techo móvil o la puerta de inspección se reservará en la posición correspondiente. Cuando se utilicen bridas metálicas y refuerzos metálicos para el aislamiento del conducto de aire, se deben tomar medidas para evitar la condensación del puente frío en sus partes expuestas.

• El sistema de conductos de ventilación debe revisarse para detectar fugas de aire.

Este es el último eslabón de la instalación de aire acondicionado, pero es el eslabón más importante, por lo que el propietario no debe ignorar este vínculo en la aceptación del aire acondicionado, y debe verificarlo cuidadosamente para evitar fugas de aire después de la instalación del conducto de aire. .

• Sentido común de mantenimiento de conductos de aire

Después de la instalación del conducto de ventilación de aire, las partes abiertas, como la boca del conducto de aire y la boca del filtro que no están instaladas por el momento, deben envolverse adecuadamente con un paño de plástico a tiempo para evitar que el polvo entre en el conducto de aire limpio. provocando así una contaminación secundaria en el conducto.