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 em: duto redondo, retangular, duto espiral. Install Ventilation Duct

Classificação da Tecnologia de Processamento

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

Aplicativo

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

Construção de duto de ar

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 comuns de instalação de dutos de ar

• O material não atende aos requisitos de qualidade

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

• Ruído no duto

Este fenômeno pode ser causado pela superfície irregular, espessura irregular, indentação óbvia, rachadura, buraco de areia, cicatriz e corrosão da placa, ou afundamento plano do duto de ventilação, lateral projetando-se para fora e deformação óbvia.

• 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

Precauções para instalação de dutos de ar

1. Verifique a qualidade dos materiais antes da instalação

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. A segurança de içamento deve ser garantida

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 atenção ao desdobrar as etapas de apagamento

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. Faça um bom trabalho de inspeção de vazamento leve

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. Teste de vazamento de ar

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. O material da almofada deve ser bem selecionado

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

Pode ser resumido em uma frase, como instalar corretamente o duto de ar é extremamente importante, a seguir descreve algumas das instalações de dutos de ar em etapas detalhadas mais abrangentes, reduzir a perda causada por problemas de instalação.

• Certifique-se de que as obras de fundação sejam concluídas antes da instalação

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

● Duto de ventilação pré-fabricado

Se não for instalado temporariamente, não deve ser colocado à vontade. Todos os orifícios dos tubos devem ser envolvidos com um pano de plástico e empilhados internamente de acordo com o número do sistema, tanto quanto possível. Se as condições não permitirem, deve ser empilhado ao ar livre e preste atenção para colocar a almofada de madeira sob o duto de ar, e deve haver proteção confiável à prova de chuva, areia à prova de vento e proteção solar acima.

● Limpe o duto de ventilação

O duto de ar deve ser limpo com detergente neutro que não cause corrosão na superfície da placa, não produz poeira após a secagem e não prejudique o corpo humano. Primeiro, limpe com uma solução de limpeza, depois limpe com água limpa e, por fim, limpe a marca d'água com um pano branco e limpo. Se não estiver instalado, por enquanto, também pode ser secado naturalmente, mas após a secagem, a saída de ar deve ser vedada.

● Mantenha o duto de ventilação limpo e arrumado

O pessoal de instalação deve usar roupas, luvas e sapatos de trabalho limpos. O duto de ar e seus componentes que foram limpos e selados não devem ser desmontados antes da instalação. Ao instalar, remova a película de vedação da extremidade e, a seguir, conecte o conector; Se houver uma pausa no meio da instalação, a porta deve ser selada novamente, de forma a garantir a purificação do sistema de ar condicionado.

● Nenhuma outra tubulação deve ser colocada no duto de ventilação

A linha de força do ventilador de fluxo 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.

• A instalação do duto de ventilação deve atender aos requisitos de projeto

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.

• Conexão do flange do duto de ventilação

O material da junta deve ser usado em vez de papel grosso, papelão, cordas de amianto, fibra de cânhamo de óleo de chumbo e papel de linóleo. A junta do material da gaxeta deve ser reduzida tanto quanto possível. A junta do material da gaxeta deve ser conectada em forma de trapézio ou espiga e colada firmemente. A largura do material da gaxeta após o flange ser comprimido uniformemente deve estar nivelada com a parede interna do duto de ar. A junta entre o duto de ar e a estrutura do invólucro, como o teto e a parede divisória da sala limpa, deve ser estanque.

• O sistema de dutos de ventilação deve ter boas medidas de aterramento

Ao passar pela sala de produção auxiliar, ela deve ser estanque e nenhuma interface deve ser configurada. Quando a temperatura do ar de transporte for superior a 80 ℃, medidas de proteção devem ser tomadas para o duto de ar de acordo com os regulamentos de projeto. O orifício de medição do duto de ar deve ser colocado na posição conveniente para medição e observação; Para o furo de medição no duto de ar no teto, a placa de teto móvel ou porta de inspeção deve ser reservada na posição correspondente. Quando flange de metal e reforço de metal são usados para duto de ar de isolamento, medidas devem ser tomadas para evitar condensação da ponte fria em suas partes expostas.

• O sistema de dutos de ventilação deve ser verificado quanto a vazamento de ar

Este é o último elo da instalação do ar condicionado, mas é o elo mais importante, por isso o proprietário não deve ignorar este link na aceitação do ar condicionado, devendo verificar cuidadosamente para evitar fugas de ar após a instalação da conduta de ar .

• Bom senso de manutenção de dutos de ar

Após a instalação do duto de ventilação de ar, as partes abertas, como a boca do duto de ar e a boca do filtro que não estão instaladas no momento, devem ser devidamente embrulhadas com um pano plástico a tempo de evitar que a poeira entre no duto de ar limpo, causando poluição secundária no duto.