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        1、超市風幕柜制冷壓縮機的排氣溫度。

　　超市風幕柜制冷壓縮機的排氣溫度是指排氣閥門處的制冷劑溫度。為了保證壓縮機的安全運行,規定R12裝置的排氣溫度不能超過130℃,R22和氨的系統不能超過150℃。

　　排氣溫度過高,會引起潤滑油因溫度升高而降低粘度,使潤滑效果變差,易造成運轉部件損壞。當排氣溫度升高到接近潤滑油的閃點時,不容易出危險，排氣溫度比冷凝溫度要高得多。

　　2、超市風幕柜制冷壓縮機的吸氣溫度。

　　超市風幕柜制冷壓縮機的吸氣溫度是指吸入閥處的制冷劑的溫度。為了保證壓縮機的安全運轉,防止液擊沖缸現象。吸氣溫度要比蒸發溫度高一點,也就是使制冷劑氣體成為過熱氣體,有一定的過熱度。一般情況下,在沒有氣液過冷器。

　　冷藏柜氟利昂系統里,吸氣溫度應比蒸發溫度高5℃的吸氣過熱度是合適的。對于氨制冷裝置,吸氣過熱度一般為5~10℃,吸氣過熱度過大或過小都應避免,若過熱度過大,則會使制冷量下降,排氣溫度升高,耗功增大,若過熱度過小,易產生液擊沖缸現象。

　　冷藏柜在正常使用情況下，其壓縮機的工作時間應短于停機時間。如果工作時間超過停機時間，則說明冷藏柜工作不正常。引起該故障的原因主要有以下兩方面。

　　(1)制冷劑注入量不足，超市風幕柜長時間工作后蒸發器結霜不能化霜，箱內溫度不能降低。此外制冷系統管路有泄漏，使循環系統內的制冷劑不足，也會出現上述現象,若在工藝管口接壓力表檢查，可發現壓力低于正常值。

　　(2)壓縮機使用日久，機械磨損大，工作時機殼溫度高，高壓排氣管相對溫度低，若在工藝管口接壓力表檢查，可發現低壓值偏高。

　　(3)超市風幕柜冷凍室內結霜太厚，熱阻大，影響冷氣的傳導。

　　(4)超市風幕柜放置不正確或冷凝器積灰太厚，從而影響冷凝器的散熱。

　　(5)充注的制冷制過量，壓縮機工作負荷重，冷凝器上邊熱、下邊接近常溫。制冷劑充入量過多造成在蒸發器內不能充分蒸發，致使蒸發器制冷量下降，若在工藝管口接壓力表檢查，可發現低壓高于正常值。
 

　　1, the exhaust temperature of the refrigerating compressor of the supermarket wind curtain cabinet.

　　The exhaust temperature of the air curtain refrigerator compressor in the supermarket refers to the refrigerant temperature at the exhaust valve. In order to ensure the safe operation of the compressor, the exhaust temperature of the R12 device can not exceed 130 degrees C, and the system of R22 and ammonia can not exceed 150 degrees C.

　　The exorbitant exhaust temperature will cause the lubricating oil to reduce the viscosity due to the increase of temperature, make the lubrication effect worse, and cause the damage of the running parts easily. When the exhaust temperature rises to the flash point near the lubricating oil, it is not easy to go out of danger, and the exhaust temperature is much higher than that of the condensing temperature.

　　2, the air suction temperature of the refrigerating compressor of the supermarket wind curtain cabinet.

　　The suction temperature of the air curtain refrigerator compressor in the supermarket refers to the temperature of the refrigerant at the suction valve. In order to ensure the safe operation of the compressor, the liquid punching cylinder can be prevented. The suction temperature is a little higher than the evaporation temperature, that is, to make the refrigerant gas a superheated gas, with a certain degree of superheat. In general, there is no gas-liquid supercooling device.

　　In the Freon system of the refrigerator, the suction temperature is 5 degrees higher than that of the evaporation temperature. The ammonia refrigeration device, superheat is 5~10 DEG C, superheat is too large or too small should be avoided, if the superheat is too large, will cause a decrease in the refrigeration quantity, exhaust temperature, power consumption increases, if the superheat is too small, easy to produce liquid hammer cylinder phenomenon.

　　When the refrigerator is used normally, the working time of the compressor should be shorter than the shutdown time. If the working time exceeds the downtime, it is indicated that the refrigerated cabinet is not working properly. The main causes of the failure are the following two aspects.

　　(1) the quantity of refrigerant injection is insufficient, and the frost of the evaporator can not be frosted after a long time work of the supermarket wind curtain cabinet, and the temperature in the box can not be reduced. In addition, the leakage of the refrigeration system piping will make the refrigerant in the circulatory system insufficient. This phenomenon will also happen. If we check the pressure gauge on the technological orifice, we can find that the pressure is below the normal value.

　　(2) when the compressor is used for a long time, the mechanical wear is great, the temperature of the case is high and the relative temperature of the high-pressure exhaust pipe is low. If we check the pressure gauge with the technological orifice, we can see that the low pressure value is high.

　　(3) the frost of the supermarket air curtain freezer is too thick, and the heat resistance is large, which affects the conduction of the cold air.

　　(4) the air curtain cabinet in the supermarket is not properly placed or the condenser ash is too thick to affect the cooling of the condenser.

　　(5) overcharge of the refrigerating system, the compressor working load heavy, the condenser top hot and lower near the normal temperature. Too much refrigerant charge can not cause enough evaporation in the evaporator, resulting in the decrease of the refrigerating capacity of the evaporator. If we check the pressure gauge on the technological orifice, we can find that the low pressure is higher than the normal value.