The mold temperature machine is naturally no stranger to many friends who are engaged in the mold industry, but for many of the basic knowledge of the cooling system of the mold temperature machine, many people are completely ignorant. However, since the basic knowledge of the cooling system of the mold temperature machine has a great significance for the normal operation, service life and maintenance of the mold temperature machine, this article introduces the basic knowledge of the mold temperature machine cooling system from two aspects. The function and principle of the temperature machine are also similar to the chiller and screw chiller , but the application range of the mold temperature machine is more targeted, mainly used in the mold industry!
1. Direct or open cooling system: This is a very popular system. Its basic components are electric water pump and immersion heater. The electric water pump is responsible for running water in the cooling pipes of the mold. The water temperature is constantly being measured. When the temperature reaches the set value, the electric heater is switched off. If the water temperature continues to rise slightly beyond a certain set point, the solenoid valve is opened to drain part of the hot water, and the lost water is replenished by the colder tap water. This system is widely used because it has the advantages of simple design and low manufacturing cost (compared with indirect systems). However, the system needs to be replenished with new tap water, which means that more dissolved chemicals are also being used. Added to the system, it accelerates the deterioration of the deposition problem of the cooling pipe. In order to reduce the cooling water temperature rise and fall, the power control of the electric water heater and the accuracy of the water temperature measurement must be very good, so that the water temperature is controlled within the required range, and some systems can even adjust the water temperature to adapt to the mold temperature.
2. Indirect cooling system: The indirect cooling system can be applied to the mold temperature lower or higher than the general cooling water temperature. The heat brought by the coolant is dissipated via the heat exchange system. The system uses the high-pressure principle to make the water temperature exceed its boiling point at atmospheric pressure, and a heavy immersion electric heater provides rapid temperature rise. The device responsible for dissipating heat is a line-type heat exchanger with a large heat exchange area. And there are solenoid valves to control the heat dissipation process. The precise switching of heating or cooling is controlled by a proportional control instrument. If the liquid running in the system and mold is aqueous, its maximum temperature can reach 141 ° C / 248F °. However, when the temperature exceeds 120 ° C / 248F °, an aqueous system should be used, because the pipe may burst and cause great danger. For the demand of temperature over 121 ℃ / 248F °, we can use oily circulation system (also can use electric heater rod as auxiliary way). In the production of molds, ice water is often used for cooling purposes to transform productivity or make up for the lack of mold design. The refrigerators used are equipped with refrigeration units to cool the cooling fluid passing through the heat exchanger. The heat exchanger has many line-like pipelines. High-pressure frozen liquid is circulated in the tube. The mold coolant continuously flows through the outside of the pipeline to deliver heat to the refrigerant and vaporize the refrigerant. After being compressed and cooled to reduce to liquid, the heat exchange process can be continuously performed. At present, there is a strong interest in the application opportunities of the heat energy discharged from refrigerators, and they may be responsible for providing a warm environment for the room in the near future.
The knowledge of the cooling system of the mold temperature machine may be relatively abstract, but after combining the practical application and learning to master these basic knowledge, you will be able to use the machinery and equipment reasonably and effectively!
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