Application range and common problems of low temperature coolant circulation pump

Introduction to low temperature coolant circulation pump:

The refrigeration cycle tank (pump), also known as the low temperature constant temperature bath, is a high-precision constant temperature source with its own refrigeration, and has the function of a small chiller. Widely used in petroleum, chemical, metallurgy, pharmaceutical, biochemical, physical properties, testing and chemical analysis and other research departments, institutions of higher learning, factory laboratories and metrological quality inspection departments. Depending on the size of the slot opening, a constant temperature test can be carried out in the bath, or it can be connected to other equipment through a hose and used with a constant temperature source. Internal circulation: The circulation of the liquid medium in the tank by the pump increases the uniformity of the temperature in the tank and reduces the temperature fluctuation. External circulation: Through the circulation capacity of the pump, the insulated hose is connected with the external equipment by the water outlet to form a closed loop, which flows back to the water inlet of the equipment, and externally introduces the constant temperature medium in the tank to establish an external constant temperature field.

Application areas for circulating water thermostats:

Biochemical fields: rotary evaporator, Abbe refractometer, polarimeter, atomic absorption, ICP-MS, ICP, nuclear magnetic resonance, CCD, biological fermenter, chemical reactor (synthesizer), etc. Materials: Electron microscopy, X-ray diffraction, X-ray fluorescence, vacuum sputtering, vacuum coating, ICP etching, various semiconductor equipment, fatigue testing machines, chemical deposition systems, atomic deposition systems, etc. Medical field: superconducting magnetic resonance, linear accelerator, CT, low magnetic field nuclear magnetic resonance, X-ray machine, microwave therapy machine, medical cold cap, cooling blanket and so on. Physicochemical fields: lasers, magnetic fields, various molecular pumps, diffusion pumps, ion pumps, and materials. A variety of water-cooling equipment used.

Features:
Energy savings – Cooling water can be recycled in the system loop during summer and high ambient temperatures, saving a lot of water.
More efficient – ​​a circulating water plant can meet the cooling needs of multiple external devices at the same time, providing a constant temperature source for condensation experiments.
Temperature control accuracy - PID temperature control technology, built-in PT100 sensor, high temperature control accuracy, temperature digital display, intuitive operation
High security - self-diagnosis function; multiple safety protection functions such as freezer overload protection.
Low temperature antifreeze ratio
A glycol aqueous solution: ethylene glycol / water 55 / 45 (-30 ° C), 70 / 30 (-40 ° C)
B glycerol aqueous solution: glycerol / water 70 / 30 (-30 ° C) in use, always check the density of low temperature antifreeze to meet the following requirements: 1. A glycol aqueous solution: P20 = 1079 kg / m3 ( -30 ° C) (-40 ° C) 2. Aqueous glycerol solution: P20 = 1182.6 kg / m3 (-30 ° C) When the antifreeze is replaced by water, the minimum temperature must be above 0 °C.
Cooling water selection related:

Generally, small-circulating water-cooling thermostats with a cooling capacity of less than 1000 W are widely used in laboratory condensing devices such as low-power lasers, parallel evaporators, parallel quantitative concentrators, parallel reactors, and distillation meters. Medium-sized circulating water cooling thermostats with cooling capacity below 6000W are widely used in analytical instrument industries such as AAS, ICP, ICP-MS, and electron microscopy, and laboratory equipment such as rotary evaporator, Soxhlet extraction, solid-liquid extraction, and Kjeldahl analyzer. , laser marking machine, laser cutting machine and other laser instruments and machine tool industry. Large circulating water cooling thermostat with refrigeration capacity above 10KW is widely used in X-ray diffractometer, magnetic mass spectrometer, fatigue testing machine, vacuum coating machine, plastic forming equipment, laser cutting machine, X-ray fluorescence spectrometer, infrared spectrometer, differential thermal analysis Instruments, nuclear magnetic resonance and other equipment with high refrigeration constant temperature requirements.
Application range:
Cooling of the heating part of the semiconductor manufacturing equipment: temperature management of single wafer cleaning and transfer, printing machine, automatic chuck mounting device, spraying device, ion plating device, etching device, single wafer processing device, slicer, packaging machine, developer , a light-emitting device, a heating device for a magnetic portion, and the like.
Cooling of the heat generating portion of the laser device: laser processing, heat generating portion of the fusion splicer, laser marking device, generating device, carbon dioxide laser processing machine, and the like.
Cooling of heating parts of other industrial machines: plasma welding, automatic packaging machine, mold cooling, washing machine, gold plating tank, precision grinding machine, injection molding machine, molding part of resin molding machine, etc.
Analysis and detection of the cooling of the heat generating part of the machine: the light source of the electron microscope, the light source part of the ICP emission spectroscopic analyzer, the heat generating part of the spectrophotometer, the heat source of the X-ray analyzing device, the light source of the atomic absorption photometer of the heating part of the automatic pulse amplitude modulator Wait. The water tank can be circulated and cooled in and out of the machine with high-quality pure water, which can ensure the normal operation of precision instruments with high water quality requirements and prolong the service life of precision instruments.
common problem:
1. The water cycle has been used for more than a year. Normally, the cooling rate seems to be getting slower and slower. The higher the temperature, the more obvious it is.
A: Water recycling is easy, but regular maintenance work can't be ignored. There are a lot of seemingly faulty problems that are caused by not doing regular maintenance. The electric power of the water cycle itself and the heat taken away by the refrigerant from the load need to be removed from the radiator at the front hood. If the front hood is filled with dust and cotton wool, it will hinder the heat dissipation, and the cooling effect will be Great discount. Generally, the decrease in cooling capacity under normal use conditions is caused by poor ventilation or high ambient temperature.

2. The water cycle was normal before use, but now the noise is much larger than before. What is the reason?
A: As mentioned above, the daily maintenance work of the water cycle is also related to this issue. Everyone knows that there is a small amount of impurities in the water, that is, after the distilled water is added to the water tank, it is impossible to completely guarantee that there is no impurity at all. For the water cycle, the general temperature is set at 20 ° C, which is especially suitable for the growth and reproduction of microorganisms. After a long time, these microorganisms will block the filter of the waterway, causing poor water return and the pump will have a large noise. Sometimes these microorganisms are attached to the surface of the heat exchanger, causing the heat transfer effect of the heat exchanger to be deteriorated and the cooling capacity to be small. Therefore, we must do the routine maintenance work in strict accordance with the requirements in the manual, regularly clean the inner tank, and stop it for a long time to keep the tank dry. There seems to be a leak in the water cycle. Sometimes there are a few drops on the ground. Is there a leak on the waterway? Generally speaking, there is no leakage in the waterway during normal use. When the relative humidity in the high ambient air is too large, the water pump, the water pipe joint, and the external water pipe in the water circuit of the water circulation are likely to condense dew. After accumulating more, it will drip onto the ground, and there is no need to worry that there is water in the waterway. The place where the water leaks. If you are concerned about this, turn on the air conditioner to lower the room temperature or dehumidify to avoid dew.

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