(1) Expansion valve can improve the operating efficiency of the refrigeration system (rapid cooling, heating, system optimal control, protection, etc.). (2) expansion valve can be controlled in the positive and negative directions. (3) Expansion valve control a wide range of operating signals and flow have a good linearity. (4) Expansion valve can be very fine control. (5) expansion valve open, less lag, accurate control. (6) Expansion valve refrigerant circuit is a sealed structure, separate from the electrical circuit, it is safe. 113 Specifications and performance parameters: Drive: Drive: 4 phase stepper motor Rated voltage: DCl2V Valve part: Throttle diameter: 115 (1 cold tons); 213 Cold ton) Valve action pressure: the lowest 0MPa, the highest 213MPa Airtight: 3MPa Pressure: 415MPa See the specific specifications of the valve specifications. Standard (unsealed) flow characteristics. Measurement conditions: ①room temperature air, flow A → B, B → A basically the same; ② entrance side pressure 0198MPa, exit side: the atmosphere. There is also a leak-free sealed O-pulse. The number of pulses is 1 second pass, expressed as PPS. 2 Precautions for Use of the Motor Expansion Valve 211 Valve Drops If the ground is strongly impacted, check again and use the motor well. 212 When connecting pipe fittings: (1) Impurities in the refrigerant may cause problems such as performance. Install a filter (100 mesh or larger) on the side of the inlet and outlet. (2) When welding the pipe, cool it with a damp cloth to keep the temperature of the body below 120 ° C. If the stator coil is not suitable for operation, remove the stator coil before performing welding. (3) When welding, please note that welding slag should not fall into the pipe. To prevent oxidation, welding N2 gas pass. (4) The axis of installation should be vertical, keep within 90 ± 15 °. 213 Filling the valve with full charge when filling with refrigerant (Note that the valve is fully open when shipped with a stator coil.) If the position of the valve changes when the unit is delivered, Its fully open). 3 Electric expansion valve drive 311 Drive method (1) Stepper motor drive (unipolar 1-2 phase excitation) (2) The actual drive pulse generated by the computer, the pulse input to the drive circuit and to each phase coil distribution, the application of the drive Voltage (Rectangular Wave = Pulse Voltage) The number of frequencies f (PPS) is the commutation switching speed = pulse speed. The coil phase is energized alternately in one second f (times). Issued from the computer within a second f pulse. The step angle Η is the angle at which a pulsating rotor rotates. To Pacific Co., Ltd. CEVl3RC1-type valve, for example, H = 3175 °, if the number of pulses required for fully closed → fully open 317 × 360 ° step angle 3175 ° = 356 pulses. The fully closed → fully open the required time: the number of frequencies f = 30PPS, 356 pulses 30PPS = 1119 seconds. 312 Drive Circuit (1) Hardware: Power Supply: Coil applied voltage, the relative rated voltage DC12V ± 15, the voltage waveform is not deformed rectangular wave. IC: Recommend the use of good quality products. MITSUBISHI MOTOR M54532P manufactured by MITSUBISHI ELECTRIC CORPORATION (2) Software ①Excitation Method It is recommended that the excitation be 1 ~ 2 phases and the frequency be 30PPS. ②Please energize the coils according to the energization mode required by the product. In order to prevent the coil temperature rise, please control the energization rate below 50. ③ The drive signal can be selected from one pulse signal to two, three, four, etc., but set 0 pulse base point (start) at start-up. An excitation of 356 pulses or more, for example, 368 pulses, is applied in the valve closing direction. Another 0 pulse base point in the A phase excitation state. ④ When stopping, keep the final power-on mode for 3 pulses (011 seconds). After outputting the final power-on mode again, start from this mode and the adjacent power-on mode. ⑤ control, please do not touch the stopper (closed valve 0 pulse, open the 356th pulse). - [Foreign new technology and new product information 3] - According to the "Geography" magazine published in Hamburg, researchers at the Technical University of Munich developed a cream that not only melted slower, but also tasted more creamy . To increase the size of the cream particles and slow the melting of the ice cream, the researchers first produced a whey concentrate which was then heated to 80 ° C in a heat exchanger and the resulting pieces of food were then cooled Evaporative condenser selection) to 5 ℃, and then shredded, resulting in fine particles between 4 to 20 microns. Hitachi has developed a new series of refrigerators PAM, the refrigerator wall installed seven sensors to monitor the temperature inside the refrigerator. When a high-temperature food is found, the cold air jets swung left and right to cool the food at about 10 times the wind speed of about 3 ° C. Japan Institute of Superconductor Technology and business cooperation, recently in superconducting integrated circuits to create 10,000 Josephson junction components. Researchers used ion beams to irradiate the surface of yttrium-barium-copper oxide, which was superconducting at -181 ° C, to form an insulating layer of about 2 nanometers in thickness with a uniform thickness of 10,000 Josephson Sen junction components. Compared with the current electronic components, work faster than 100 times, while the power consumption is only one-thousandth of the current.
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