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COMMON PROBLEM


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1. Shell and tube condenser is a kind of heat exchanger commonly used in chillers. It is similar to shell and tube evaporator. Shell and tube condenser is composed of shell, tube sheet, heat transfer tube bundle, and cooling water distribution components (water cover or A closed water-cooled condenser composed of water distribution tank), cooling water and refrigerant inlet and outlet pipe joints, etc. 2, small condenser shell can choose thick seamless steel pipe. The shell of the large condenser is welded with steel plate. The tube plate is welded to both ends of the shell to form a complete shell. Many holes (tube holes) are machined on the tube plate. After the heat transfer tube bundle penetrates into the tube holes, both ends are connected with the tube plate by expansion or welding, and must be equipped

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The function of the oil separator is to separate the lubricating oil in the high-pressure steam discharged from the refrigeration compressor to ensure the safe and efficient operation of the device. According to the oil separation principle of reducing the airflow speed and changing the airflow direction, the oil particles in the high-pressure steam are separated under the action of gravity. Generally, when the air velocity is below 1 m/s, the oil particles with a diameter of more than 0.2mm in the steam can be separated. The commonly used oil separator has four kinds of washing type, centrifugal type, packing type and filtration type. 1. The structural oil separator is installed between the compressor outlet and the condenser inlet. Through separation, improved condenser and evaporator

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At present, in the cold areas of northern my country, the traditional centralized heating method is mainly coal-fired. Due to smoke and dust emissions, severe weather phenomena such as haze and PM2.5 exceeding the standard occur in northern cities in winter. Therefore, in recent years, the country has vigorously promoted clean heating methods. Many buildings use water source heat pump units as heating hosts to replace traditional coal-fired boilers, and water-water water source heat pump units are mainly used. The existing water-water type water source heat pump units on the market mostly adopt the mode of water circuit switching for cooling and heating mode conversion: when cooling in summer, source water (groundwater, river, river, lake water, etc.) enters the condenser of the unit and

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At present, large-scale low-temperature refrigeration and refrigeration places generally use multi-machine parallel screw refrigeration units, but screw compressors generally use oil-injected compression. The exhaust of the compressor will take part of the refrigeration oil out of the compressor, in order to prevent the compressor The refrigerant oil enters the system, which has a great impact on the reliable operation of the compressor and the heat exchange efficiency of the heat exchanger, so it is necessary to install an oil and gas separator at the exhaust end of the compressor. Lengde Company has designed a series of products for screw compressors without oil separators, especially parallel screw compression condensing units. The special performance and structural design of this product enable it to ensure sufficient lubricating oil supply.

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The full name of the low-pressure circulation barrel is the low-pressure circulation liquid storage barrel, which is mainly used for the forced liquid supply system, the low-pressure refrigerant is circulated by the pump, and the gas-liquid separation is also played. The main components are cylinder, head, air return interface (connected to evaporator air return port), air outlet interface (connected to compressor air return port), liquid outlet (connected to freezing pump inlet), oil discharge port, liquid supply port (connected to high-pressure liquid supply pipe), bypass interface, safety valve interface, liquid level control interface (one upper and one lower interface), gas bypass interface (connected to freezing pump gas outlet), etc. Low-pressure circulation barrels with different capacities are selected according to different cooling capacities. The volume varies from 1 to 10 cubic meters. Low-pressure circulating barrel used in the past

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The development of shell-side baffles and tube bundle supports of shell-and-tube heat exchangers shows the change and development of baffle forms. Their characteristics are that through the development and improvement of the support structure of shell-side heat exchange tubes, the heat transfer dead zone of shell-side fluid flow can be eliminated as much as possible, the heat transfer performance of shell-side can be improved, the flow resistance of shell-side can be reduced, the flow velocity can be increased, and the scale can be reduced. The forms that have emerged so far can be summarized as baffles, baffles, and other types of structures. The setting of the baffle plate can increase the flow rate of the shell-side fluid, increase the degree of turbulence, and make the shell-side fluid vertically flush the tube bundle to improve
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