Measurement of temperature rise and outlet pressure of Roots vacuum pump

The temperature rise of Roots vacuum pump refers to the difference between the maximum temperature and the room temperature measured at all parts of the pump surface under the condition of stable operation of the limit vacuum or rated vacuum (referring to the direct exhaust atmosphere roots vacuum pump). The type of thermometer used for measuring temperature rise is not limited, but it should have a measurement accuracy of ± 1 ℃. When marking the temperature rise, the room temperature at that time and the cooling conditions of the pump, including the cooling method, shall be indicated. If it is water cooling, the temperature of inlet and outlet water shall be indicated.

The outlet pressure of Roots vacuum pump refers to the pressure measured near the exhaust port corresponding to a certain inlet pressure value under the condition of stable operation of Roots vacuum pump. The test of outlet pressure can be carried out simultaneously with the measurement of pumping rate, starting from the appropriate value close to the limit vacuum until the allowable inlet pressure of the pump is about. The outlet pressure is measured corresponding to each inlet pressure value.

The measurement position of the outlet pressure is specified in the ministry standard. The distance between the pressure measuring tube and the pump outlet flange shall not be greater than the pump outlet diameter, and the opening plane of the pressure measuring pipe shall be parallel to the air flow direction. The insertion depth is 1 / 4 D, but not more than 50 mm.

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