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GB/T 21272-2007: Vapour vacuum pumps measurement of performance characteristics -- Measurement of back-streaming rate of pump fluid and the heating time
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GB/T 21272-2007	English	259	Add to Cart	3 days [Need to translate]	Vapour vacuum pumps measurement of performance characteristics -- Measurement of back-streaming rate of pump fluid and the heating time

GB/T 21272-2007: Vapour vacuum pumps measurement of performance characteristics -- Measurement of back-streaming rate of pump fluid and the heating time

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Vapour vacuum pumps measurement of performance characteristics. Measurement of back-streaming rate of pump fluid and the heating time ICS 23.160 J78 National Standards of People's Republic of China Steam flow vacuum pumps - Measurement of performance Measuring pump fluid reflux rate and the heating time Posted 2007-12-02 2008-06-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This revised standard adopts DIN28427. 1983 "diffusion pump fluid vapor pressure lower than the pump and steam jet pumps 1mbar acceptance of the rules." (In German). If necessary, the use of this standard DIN28427. 1983 when modified. The technical differences between a single vertical line marked on it Margin were involved in terms of pages. It is given in Appendix A of this standard and DIN28427. 1983 technical differences and their reasons List for reference. For ease of use, this standard also made the following editorial changes. The term --- "The acceptance criteria" to "this standard"; --- Remove the DIN28427. 1983 Foreword. Appendix A of this standard is an informative annex. The standard proposed by China Machinery Industry Federation. The vacuum technology standard by the National Standardization Technical Committee (SAC/TC18) centralized. This standard is drafted by. Lanzhou vacuum equipment limited liability company. Participated in the drafting of this standard. Liaoning genuine dragon vacuum equipment Manufacturing Co., Ltd., Shenyang Institute of Vacuum Technology. The main drafters of this standard. Wen Falan, Xuyu Jiang, Xu Yan Qiao, Linsen, ROCKETS. Steam flow vacuum pumps - Measurement of performance Measuring pump fluid reflux rate and the heating time

1 Scope

This standard specifies the method for measuring the steam flow rate vacuum pump fluid reflux and the heating time. This standard applies to the following vacuum vapor flow. diffusion pump, diffusion ejector pump (hereinafter referred to as the pump). Pump room temperature (20 ± 5) ℃, Pump fluid vapor pressure lower than 100Pa.

2 Terms and definitions

The following terms and definitions apply to this standard. 2.1 When the pump according to specified conditions, in unit time through unit area of the pump inlet, and is drawn with the opposite direction of gas flow pump fluid quality flow. 2.2 Heating time of the pump means the pump began to turn on heaters, the time interval from the pump when the pumping action. 2.3 It is mounted in the pump inlet having a predetermined shape and size of the container, through which the test gas into the pump, a pressure measuring means mounted thereon. Measurement 3 pump liquid reflux rate 3.1 device 3.1.1 Test cap 1, the test cover cylindrical bell-type container, the cover of the inner diameter D and an inner diameter equal to the pump port, the cover shell can be circular, tapered Or tapered. The axial dimension of cover for 1.5D. Test gas imports in the cover of the axis, and the distance from the flange connection to D, the intake port The arrangement should be made away from the direction of the gas from the pump into the test port cover. Measuring pressure regulation connecting pipe connecting flange 0.5D at a distance, its Axis should be perpendicular to the axis of the cover test, the test should be perpendicular to the axis of the cover of the pump inlet flange plane. Test cap shall be provided to adjust the temperature of the wall of the cover means, such as welding around the outer surface of the water cooling pipe or other cooling devices. 3.1.2 measuring flange As shown, an inner surface of the flange collecting chute opened a reflux pump fluid, the inner diameter of the flange and the inner diameter of the pump port and the test cover 2 equal. 3.1.3 measuring tube 2, to measure the amount of reflux liquid pump apparatus, with a graduated glass measuring tube, the tube should not scale error Greater than ± 5%. The upper end of the measuring tube has a hose connector, there is a side branch pipe. Available measurement site two vacuum-sealed cock closed. A collecting container below, the same tap connected to the other small vacuum pump. May also be used as shown in Figure 3 apparatus, the lower end of the measuring tube closed at this time. 3.1.4 Gauge Between the regulation and the test cover flow guide connecting tube should be at least 3L/s. Connecting tubes should protrude from the inner wall of the cover 1mm. ...