Application characteristics and selection of chillers in various industries

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Application characteristics and selection of chillers in various industries

First, UV curing machine:

Features: stepless dimming + water cooling + metal halide lamp = energy saving + low temperature + high efficiency, water cooling in the lamp room (Kawamoto chiller chilled water) + air-cooled heat removal, heat-insulated quartz glass under the lamp tube, effectively reduce The surface temperature of the object to be protected will not be deformed by heat and prolong the service life of the lamp tube; the CBE water-cooling series is suitable for: domestic and foreign printing equipment such as offset printing machine, gravure printing machine, flexo printing machine and glazing coating machine. Offset printing machines such as: Germany Manroland, Heidelberg, KBA, Japan Komori, Liang Ming, Mitsubishi, Sakurai, and others. Gravure printing machines such as: Bobst, Switzerland, Cerudi, Xi'an Black Bull, Zhongshan Songde, some customers: Baoding Special Light Source Electrical Appliance Factory; Zhisheng (Guangzhou) Technology Co., Ltd.

Second, the ultrasonic cleaning machine:

Studies have shown that when ultrasonic waves act on liquids, the rupture of each bubble in the liquid will produce a shock wave with a great energy, which is equivalent to instantaneously generating several hundred degrees of high temperature and up to thousands of atmospheres. This phenomenon is called "empty". "Analysis", ultrasonic cleaning is the use of shock waves generated by the bubble burst in the liquid to achieve the role of cleaning and flushing the inner and outer surfaces of the workpiece.
The second ultrasonic wave propagates in the liquid, causing the liquid to vibrate together with the cleaning tank at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, it has its own natural frequency, and the vibration frequency is the acoustic wave frequency, so people hear the click sound.
The suitable cleaning temperature of the water cleaning solution is 40-60 ° C, especially when the temperature of the cleaning liquid is low and the cavitation effect is poor, and the cleaning effect is also poor. Therefore, some washing machines are wound around the heating cylinder to heat the heating wire for temperature control. When the temperature rises, cavitation is easy to occur, so the cleaning effect is good. When the temperature continues to rise, the gas pressure in the vacuole increases, causing the impact sound pressure to drop, reflecting the multiplication of these two factors. According to the final factor, the Kawamoto brand industrial chiller can reduce the temperature of the cleaning agent and condense the gaseous cleaning agent to effectively prevent the evaporation of the cleaning agent.

Third, the plastic industry injection molding extrusion blowing blow molding film, calendered film
Standard industrial chillers are suitable for these industries.
The plastic mold of the injection mold is melted by heating and injected into the mold. After the condensation, the mold is opened to form a plastic workpiece. In the continuous production process, the mold is cooled to shorten the plastic setting time and improve the dimensional accuracy of the workpiece. ,Surface Quality.
Frozen water temperature requirement: 6...18 °C
Frozen water temperature difference requirement: ±2K or ±0.5K
The cooling capacity of a chiller is related to the injection volume of the injection molding machine (commonly referred to as “Ans”). The larger the injection volume, the greater the required cooling capacity. Injection molding machines are usually marked by the “tons” of clamping force. This requires converting “tons” into “an ounces”, but “tons” and “anshi” are not one-to-one correspondence. The following comparison table only For the general case of the conversion relationship, and there is a certain upper and lower deviation.

Extrusion
Extrusion of pipes, trunking, cables and various plastic profiles. The heated molten material is cooled by a frozen water bath after being molded into a mold, and the temperature of the water in the frozen water bath must be kept constant. Due to the high production speed, large-volume units are required for the surface. Since the existing freezing pool is large enough, the unit may not be equipped with a water tank.

Blowing bottle
It mainly produces all kinds of mineral water bottles and soda bottles. Compressed air drying - blowing, using clean, dry compressed air, using the cold water provided by the industrial chiller as a source of cold to remove moisture from the compressed air. Mold cooling - The chiller can accurately control the mold temperature, improve product quality and increase production efficiency. Compressed air drying and mold cooling can use the same chiller as a cooling source

Thermoforming
The common products of zui are some small containers, such as yoghurt cup plastic extruded at a constant frequency. It is very important to maintain a constant temperature. The temperature difference range of chilled water is very high, so a proportional frozen water valve is needed. The temperature is precisely adjusted from the ground.
Hydraulic system
The hydraulic system is required to open the mold, mold clamping and injection. The hydraulic oil absorbs the temperature of the hydraulic pump and the temperature rises. Generally, the oil temperature cannot be higher than 60 °C.
The cooling water temperature is about 27 ° C. Since the water temperature is not the same as the mold, the electric water valve needs to be separated from the mold cooling circuit or an independent cooling system is required.

Fourth, the machinery industry

Laser Technology <br> Laser sources, beam controllers, and electrical cabinets in laser (laser) systems may require additional cooling. The freezing water temperature requirement is usually between 15...22 °C, and the accuracy of the frozen water is usually ±1K or ±2K. Some equipment may require ±0.5K, and some other equipment have certain requirements for the conductivity of the frozen water and corrosion resistance. In laser systems, there is usually a requirement for water temperature at startup, which requires an increase in electrical heating in the water circuit. Beam controllers in some systems require separate cooling loops. For special applications in laser systems, industrial chillers can be specifically designed to meet different requirements.
Welding electrodes, welding furnaces and cutters all require cooling. Such as large and medium-sized welding machine electrode tip cooling; gold and silver hand-milled electric furnace cooling and other small to medium-sized chillers. Internal or external circulating water pump systems or closed tank systems are required.
Cutting Many cutting machines (machining centers, lathes, milling machines, drilling machines, etc.) require high-speed rotation of the tool or spindle to generate heat, which also generates a large amount of heat during the cutting process. Cooling parts such as spindles, cutting fluids, lubricating oils, hydraulic oils, electric control cabinets, etc. are usually required in these machine tools.
Non-cutting processing such as electric discharge machines, polishing machines, grinding machines, etc. When using a chiller, the water system is easily blocked by some iron filings, so it is necessary to install a filter. Internal or external circulating water pump systems or closed tank systems are required.

Chuanben brand industrial chiller selection

1. Calculate the calorific value by the temperature difference between the inlet and outlet of the cooling water (oil)

Q = SH × De × F × DT / 60
Q: Calorific value KW (Note: The heat output of Kawamoto 1P chiller is about 3KW)
SH: The specific heat of hot water is 4.2KJ/Kg*C (4.2 kJ/kg*C) The specific heat of the oil is 1.97KJ/Kg*C (1.97 kJ/kg*C)
De: Specific gravity of water is 1Kg/L (1kg/L). The specific gravity of oil is 0.88Kg/L (0.88kg/L).
F: Flow LPM (L/min l/min)
DT: cooling water (oil) inlet and outlet temperature difference (outlet temperature - inlet temperature)
Note: "/ 60" is used to change the flow rate per minute to liters per second; 1kW = 1kJ/s;
Example 1: Cooling water inlet water is 15 degrees, water output is 20 degrees, flow rate is 20 liters/minute calorific value Q = 4.2 × 1 × 20 × (20-15) / 60 = 7KW
When choosing the chiller cooling capacity, you can increase the temperature by 20%-50%. CBE-03W can be selected.
Example 2: The cooling oil inlet is 18 degrees, the oil is 26 degrees, the flow rate is 15 liters/min. The heat is Q = 1.97 × 0.88 × 15 × (26-18) / 60 = 2.6KW
When selecting the cold water (oil) machine cooling capacity, you can increase the temperature by 20%-50%. CBE-02A can be selected.

2. Estimation of power and heat generation through the equipment

a. For spindle cooling, estimate the cooling capacity of the required refrigeration unit based on 30% of the spindle motor power.
Example: 15KW motor, optional refrigeration unit with 4.5kw or 5.8kw cooling capacity;
b. The injection molding machine can be calculated according to the cooling capacity of 0.6KW per ounce or the cooling capacity of 3KW per 80 tons;
3. Calculate the calorific value by the temperature rise of the water (oil) tank
Q = SH × De × V × DT / 60
Q: Calorific value KW
SH: The specific heat of hot water is 4.2KJ/Kg*C (4.2 kJ/kg*C) The specific heat of the oil is 1.97KJ/Kg*C (1.97 kJ/kg*C)
De: Specific gravity of water is 1Kg/L (1kg/L). The specific gravity of oil is 0.88Kg/L (0.88kg/L).
V: Water capacity L (liter) includes the total water capacity in the tank and piping
DT: water (oil) in a minute of zui temperature rise: "/ 60" is used to change the temperature rise Celsius / minute to Celsius / second; 1kW = 1kJ / s;
Note: When measuring, the temperature of the water (oil) tank should be slightly lower than the ambient temperature; and the equipment is working under a large load of zui.
Example: Water tank volume 3000L zui Large water temperature 0.6 degrees / minute calorific value Q = 4.2 × 1 × 3000 × 0.6 / 60 = 126KW
CBE-50W can be selected when the cold water machine is selected to increase the cooling capacity by 20%-50%.
Additional instructions:
1. The cooling capacity of the chiller varies with the ambient temperature and the outlet temperature;
2. The actual heat generated by the equipment will also change due to different workpieces, molds, parameters, etc.
3. After using the chiller, the temperature drops, and the surface temperature of the connecting pipeline, water tank, fuel tank, mold, main shaft and equipment will be lower than the ambient temperature, so the heat will be absorbed and the load will increase;
4. In the actual application of industrial cooling, many cases cannot be accurately calculated by the above methods. At this time, it can only be estimated by empirical data and analogy of similar equipment.
5. Any calculation method may have deviations, so that the actual refrigeration unit selected is too large or too small, so the above method is for reference only.

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