In addition to the appearance structural parts of the foundation, the laser water chiller system mainly includes its internal refrigeration system and control system. The refrigeration system is generally composed of four parts: compressor, condenser, throttle valve, evaporator, etc; The control system includes the control of the compressor, throttle valve, circulating water pump, auxiliary heating rod, etc. of the refrigeration system, as well as the control of the supporting liquid level, flow, ambient temperature and other monitoring parts, and even the external communication system.
The first is the cooling capacity. The cooling capacity of the laser chiller must first match the heating capacity of the laser. At present, domestic equipment manufacturers generally choose the chiller with large cooling capacity to ensure sufficient cooling capacity when they do not choose it. However, in fact, high-power chillers are large in size and heavy in weight, which brings various inconveniences to transportation, testing and handling. The refrigerating capacity of the compressor varies with the evaporation temperature, condensation temperature, etc., so the refrigerating capacity of the laser water chiller varies greatly in different seasons and different external ambient temperatures (such as whether the indoor air conditioner is installed during actual use). The selection of an appropriate laser water chiller should consider the refrigerating capacity comprehensively according to the actual situation, and should not be too small or redundant.
The second is the head (or pressure) and flow of the water chiller. At present, when most laser equipment manufacturers select the water chiller, the parameters such as pressure and flow are specified by the laser manufacturer. Generally speaking, the head and flow of the water pump are large, which is good for laser heat dissipation. However, it is very difficult to select the water chiller pump after increasing the head and flow, especially the volume, weight and power consumption of the water chiller will be greatly increased. From the perspective of the laser manufacturer, increasing the head and flow parameters can not only reduce the design difficulty of the internal cooling plate of the laser, but also avoid risks. As a laser equipment factory, when selecting the laser water chiller, the parameters provided by the laser manufacturer should be used as a reference, but should not be superstitious. Instead, according to the actual test results, selecting the appropriate head and flow of the water chiller can reduce the cost of the water chiller to a certain extent, thus improving the overall competitiveness of the laser equipment.
The third is temperature control. Different lasers have different requirements for temperature control accuracy. The fiber laser mainly needs to take away the heat. Generally, the accuracy requirement is ± 1 ℃. In fact, it can be used at ± 2 ℃ or even within 35 ℃ of water temperature. However, for ultraviolet laser, the accuracy requirement is very high, which is ± 0.1 ℃ or higher. The laser with high accuracy requirements is very strict for the selection of matching water chillers, and it is also a test for the technology of laser water chiller manufacturers. Therefore, laser chillers with high accuracy requirements will also be more expensive.
The fourth is the choice of laser water chiller to be pushed backwards by the end user. At present, some manufacturers are still using R22 refrigerant to develop laser chillers in order to save costs, while R22 refrigerant has been gradually replaced due to its damage to the ozone layer, and has been banned in developed countries. If the whole set of laser equipment is exported to relevant countries, the selection of water chillers should also consider environmental protection. Of course, there is also the problem of the corresponding national voltage system. In this regard, we advocate to use the DC variable frequency compressor as far as possible, because the use of DC power supply can be modulated by the AC-DC power supply module in different countries, and the AC-DC power supply module has strong universality. At the same time, the use of DC variable frequency compressor is not only conducive to high-precision temperature control, but also the main direction of energy conservation and emission reduction in the future.
The fifth is the demand for communication. At present, many laser water chillers only work alone, and at most one alarm signal is connected to the upper computer. When the water chiller is abnormal, the laser equipment at most knows that there is a problem with the water chiller, but does not know what the problem is and how to troubleshoot it. Quanguan's chiller adds a communication interface according to the market demand. Through the communication with the upper computer, the upper computer can understand the internal parameters of the machine, such as the working state of the compressor, the working state of the water pump, and so on. As one of the important components, the laser water chiller should communicate with the host computer in real time, and even incorporate the operation of the water chiller into the control system of the laser equipment, so as to effectively improve the core competitiveness of the laser equipment and better perform the after-sales maintenance and service of the whole set of products.
Source: Quanguan Intelligent Equipment
