SAE J 1792-1-2015 Self-Propelled Sweepers - Air Flow Performance - Part 1 Suction AirVolume Performance.pdf

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4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J1792/1_201511 SURFACE VEHICLE STANDARD J1792-1 NOV2015 Issued 1996-09 Revised 2

5、015-11 Superseding J1792-1 APR2007 Self-Propelled Sweepers - Air Flow Performance - Part 1: Suction Air Volume Performance RATIONALE The document has been revised to update the referenced documents. 1. SCOPE This SAE Standard establishes a test method and a definition for disclosing the suction air

6、volume performance of self-propelled sweepers that solely use a pneumatic conveyance means for the collection and transfer of “sweepings” into a collection hopper. 1.1 Purpose The purpose of the document describes a test practice for measuring the suction air movement occurring in vacuum and regener

7、ative air street sweepers described in SAE J2130-1. The document also proposes a format for the presentation of the results. The document can be used to disclose or compare particular operating performance criteria under similar conditions. 2. REFERENCE 2.1 Applicable Documents The following publica

8、tions form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publication Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) o

9、r +1 724-776-4970 (outside USA), www.sae.org. SAE J2130-1 Identification of Self-Propelled Sweepers and Cleaning Equipment Part 1 - Machines with a Gross Vehicle Mass Greater than 5000 kg SAE INTERNATIONAL J1792-1 NOV2015 Page 2 of 6 3. DEFINITIONS 3.1 SWEEPER A self-propelled vacuum or regenerative

10、 air street sweeper that is primarily designed to sweep material from highways, parking lots, airport complexes, industrial and construction sites, and during road maintenance work. The sweeper may use broom means to dislodge and direct material into a pneumatic collection mechanism that is the sole

11、 means to convey the swept material into a collection hopper. 3.2 SUCTION/BLOWER FAN Centrifugal fan means for developing the required air movement/pressure employed in the sweepers pneumatic conveyance mechanism. 4. TECHNICAL REQUIREMENTS 4.1 Recommended Apparatus Manometer - Pitot tube - Tachomete

12、r - Thermometer - Barometer - Hygrometer (see note in 4.4). 4.2 Method The machine shall be set up in its optimum running condition according to the recommendations given in its operators instruction manual. The hopper filter meshes shall be clean and all air ducts free from debris. Wander hoses, dr

13、ain-off hoses and other apertures (other than the suction pick-up nozzle conduit), etc., shall be sealed and blanked-off. The pick-up nozzle shall be set to the correct inlet aperture setting as recommended by the manufacturer when the machine is in its normal operating condition. It is important to

14、 measure the engine and suction/blower fan speed during the test which shall be set up to the normal operating condition as recommended in the machines operational handbook. Suction/blower fan speeds may be determined by establishing the drive ratio of any gearbox or pulley arrangement, or preferabl

15、y by a tachometer means directly measuring the fan. The manometer and pitot tube shall be checked to ensure the pitot tube is clean and that the manometer and connecting tubes are perfectly sealed with no leakage to atmosphere. If an electronic manometer is used, first ensure that it is calibrated t

16、o zero pressure in the inert state. Two small holes shall be provided at 90 degrees to each other in the suction conveyance conduit large enough to permit the insertion of the pitot tube. These holes shall be positioned in the straightest section of the conduit to ensure minimum turbulence. There sh

17、all, in any case be no bends within at least 0.5 m either side of the measurement point. See Figure 1. The ambient temperature shall be recorded before and after the tests in order that results may be corrected to a standard of 20 C (68 F). Barometric pressure shall also be recorded so that correcti

18、ons may be made to a standard of 760 mm Hg or 1013 mb (norm at sea level). Corrections for temperature and barometric pressure will ensure that quantifiable comparative data is available to a common standard. SAE INTERNATIONAL J1792-1 NOV2015 Page 3 of 6 Figure 1 - Test set-up The pitot tube shall h

19、ave a calibrated scale marked with six positions, refer to Figure 2, according to the internal size of conduit fitted (refer to pitot tube divisions). The pitot tube is then inserted into the air duct with the probe pointing into the air direction flow within 5 degrees of the conduit axis. Velocity

20、head pressure readings are then read from the manometer at each of the twelve positions, six for each pass (or hole). Readings taken are the total velocity head (in millimeters water gauge), shown on the manometer. From these twelve results, the average velocity head and hence air flow velocity and

21、volume may be calculated based on the ducts cross-sectional area. Care must be taken while measuring the velocity head readings to ensure that the pitot tube is held parallel to the walls of the conduit. This may be checked by reference to the direction pointer on the tail of the pitot tube (this po

22、ints in the same direction to the pitot probe). Figure 2 - Pitot tube positions for a six-point pass in circular ducts The static depression shall also be measured within the duct in order to make a correction for air density by connecting the side holes in the pitot tube to the manometer, leaving t

23、he other side open to atmosphere. The total deflection (in millimeters water gauge) may then be read from the manometer. Note that in this application the reading will be a negative pressure and shall be used as such when applying the formulae for correction of duct depression. The negative pressure

24、 (depression) may also be measured within the hopper or within the inlet eye of the blower fan for comparative information or as a gauge of air flow against hopper depression using a manometer. These measurements may be conducted by inserting a length of small diameter tubing into the hopper via the

25、 discharge door seal or by connection onto a purpose made device which seeks the pressure within the fan inlet eye. The tube is simply connected to one side of the manometer and the total deflection (in millimeters water gauge) recorded. SAE INTERNATIONAL J1792-1 NOV2015 Page 4 of 6 4.3 Results Tabu

26、lation The test results may be typically recorded in the format shown in Figure 3, the corrected values would be derived by the calculation methods given in 4.4. Figure 3 - Results tabulation 4.4 Calculations See Equations 1 to 6. (Eq. 1)(Eq. 2)(Eq. 3)(Eq. 4)(Eq. 5)(Eq. 6)NOTE: Corrections may also

27、be made for relative humidity conditions. Usually the results shall be specified at 50% humidity. High humidity will result in lower air volume recordings due to lower density. The effect is often small and may therefore be ignored, though in adverse conditions tests should be aborted. Average veloc

28、ity head (in mm H2O 62nu12=Correction for temperature (correct to 20 C)ambient temperature (C) + 273293=Correction for barometric pressurecorrect to 1013 mb s e a level 1013barometric pressure (mb)=Correction for duct depressioncorrect to std. density 1036310363 static depression (mm H2O) in test du

29、ct+=Air Velocity in duct (m/s)4.032 1 2 3 4 uuuu(multiply by 196.8 to convert m/s to ft/min)=Volume of conveying air (m3/s)5 duct cross section (m2 u(multiply by 2118.9 to convert m3/s to cfm)=SAE INTERNATIONAL J1792-1 NOV2015 Page 5 of 6 4.5 Typical Test Summary Format The calculated results togeth

30、er with the operational criteria shall be formally presented in the format shown in Figure 4. Figure 4 - Typical test summary format SAE INTERNATIONAL J1792-1 NOV2015 Page 6 of 6 5. NOTES 5.1 Marginal Indicia A change bar (l) located in the left margin is for the convenience of the user in locating

31、areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE MTC2, SWEEPER, CLEANER, AND MACHINERY COMMITTEE