Which air conditioners are used by Hitachi compressors

Which air conditioners are used by Hitachi compressors Hitachi compressor technology is mature, good quality, reliable performance, is the first compressor used by Gree, Midea, Chigo, Haier and other air-conditioning manufacturers. okmarts.com is an authorized dealer of Hitachi compressors, with complete specifications and sufficient supply, which can meet your purchasing needs at any time. compressor okmarts.com is mainly engaged in the full range of business of agency, sales and installation of core refrigeration equipment such as electronic expansion valves, four-way valves, plate heat exchangers, Hitachi air-conditioning compressors, etc., such as Japanese Heron Palace, Alfa Laval, Guangzhou Hitachi, etc. An agent in China that owns Western refrigeration supporting brand products has been a professional agent for imported refrigeration accessories for 17 years. We firmly believe that: based on the company's good reputation and high-quality service team, with a diligent and pragmatic work style as the starting point, we strive for progress and continuous development, sincere cooperation with friends who support and trust us, and common development. Analysis of the cause and treatment of compressor frost (2) 3. Frost on the cylinder head (crankcase frost in severe cases), Hitachi ri32 inverter compressor is always caused by a large amount of wet steam or refrigerant sucked into the compressor. The main reasons for this situation are: 1. The opening of the thermal expansion valve is adjusted too large, the temperature sensor is installed incorrectly or the fixing is loose, so that the temperature is too high and the valve core is opened abnormally. The thermal expansion valve is a direct-acting proportional regulator that uses the superheat at the outlet of the evaporator as a feedback signal and compares it with a given superheat value to generate a deviation signal to regulate the flow of refrigerant into the evaporator. Letter, regulator and actuator in one. When the measured parameter of the transmitter deviates from the given value, the physical quantity of the Hitachi 3p inverter compressor changes, and generates enough energy to directly drive the actuator. The position of the actuator changes and is Adjust the parameters in proportion. The thermal expansion valve is different according to the balance method. The inverter compressor and Hitachi can be divided into two types: internal balance type thermal expansion valve and external balance type thermal expansion valve. The liquid refrigerant evaporates and absorbs heat in the evaporator. When it flows to the outlet of the evaporator, it has completely vaporized and has a certain degree of superheat. The temperature-sensing cylinder of the thermal expansion valve is close to the outlet pipe of the evaporator, and the temperature of the outlet of the evaporator is felt. If the liquid filled in the warm pack is the same as the refrigerant, the pressure of the liquid above the diaphragm of the thermal expansion valve is greater than the pressure of the liquid below the diaphragm, and the higher the temperature of the evaporator outlet, that is, the greater the superheat, the higher the temperature above the diaphragm The greater the liquid pressure. This pressure difference is balanced by the tension of the adjusting spring under the diaphragm through the ejector rod. If the tension of the adjusting spring is changed, the jacking force of the jack can be changed, thereby changing the opening of the needle valve. Obviously, the degree of superheat of the evaporator will also cause changes in the opening of the needle valve. When the adjustment spring is adjusted to a certain position, the expansion valve will automatically change the opening of the needle valve according to the temperature of the evaporator outlet, so that the superheat of the evaporator outlet remains at a certain value. The opening of the thermal expansion valve is adjusted too large, the temperature sensor is installed incorrectly or the fixing is loose, so that the temperature is too high and the valve core is abnormally opened, causing a large amount of wet steam to be sucked into the compressor and causing frost on the cylinder head. The thermal expansion valve is used in conjunction with the adjustment of the superheat when the evaporator is in operation. If the superheat at the outlet of the evaporator is too large, the superheating section at the rear of the evaporator is too long, and the cooling capacity will be significantly reduced; if the superheat at the outlet is too small, it may cause compressor liquid blow or even frost on the cylinder head. It is generally believed that the expansion valve should be adjusted to the working superheat of the evaporator outlet at 3℃～8℃. 2. The liquid supply solenoid valve leaks or the expansion valve is not closed tightly during shutdown, causing a large amount of refrigerant liquid to accumulate in the evaporator before starting. The temperature relay is used in conjunction with the solenoid valve to control the warehouse temperature. The temperature sensing package of the temperature relay is placed in the cold storage. When the temperature of the cold storage is higher than the upper limit of the starting and setting value, the temperature relay contact is closed, the solenoid valve coil is energized, the valve is opened, and the refrigerant enters the evaporator to cool down; when the storage temperature is low At the lower limit of its setting value, the temperature relay contact is opened, the solenoid valve coil current is cut off, the solenoid valve is closed, and the refrigerant stops entering the evaporator, so that the storage temperature can be controlled within the required range. 3. The opening of the suction cut-off valve is too large or too early when starting the compressor. 4. When there is too much refrigerant in the system, the liquid level in the condenser is high, and the area of ​​condensation heat exchange is reduced, which increases the condensation pressure, that is, the pressure in front of the expansion valve increases, the amount of refrigerant flowing into the evaporator increases, and liquid refrigeration The agent cannot fully evaporate in the evaporator, so the compressor sucks wet steam, the compressor and the cylinder are cold or even frosted, and may cause "liquid strike", and the evaporation pressure will be high.