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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2002 Society of Automotive Engineers, Inc. All rights reserved. No part of
3、this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER:Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4
4、970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS:http:/www.sae.org SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 STANDARD J1792-1 REV. JUL2002 Issued1996-09 Revised2002-07 Superseding J1792-1 SEP1996 Self-Propelled SweepersAir Flow Performance Part 1: Suc
5、tion Air Volume Performance ForewordThe only change to this document was in Equation 4. Some of the information from Equation 3 was inadvertently used in Equation 4 when the documents were converted for Electronic purposes. 1.ScopeThis SAE Standard establishes a test method and a definition for disc
6、losing the suction air volume performance of self-propelled sweepers that solely use a pneumatic conveyance means for the collection and transfer of “sweepings” into a collection hopper. 1.1PurposeThe purpose of the document describes a test practice for measuring the suction air movement occurring
7、in vacuum and regenerative air street sweepers described in SAE J2130. 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 2.1Applicable PublicationThe
8、 following publication forms a part of the specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1SAE PUBLICATIONAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J2130Self-Propelled Sweepers 3.Definit
9、ions 3.1SweeperA self-propelled vacuum or regenerative 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
10、into a pneumatic collection mechanism that is the sole means to convey the swept material into a collection hopper. 3.2Suction/Blower FanCentrifugal fan means for developing the required air movement/pressure employed in the sweepers pneumatic conveyance mechanism. SAE J1792-1 Revised JUL2002 -2- 4.
11、Technical Requirements 4.1Apparatus RequiredManometer - Pitot tube - Tachometer - Thermometer - Barometer - Hygrometer (see note in 4.4). 4.2MethodThe machine shall be set up in its optimum running condition according to the recommendations given in its operators instruction manual. The hopper filte
12、r meshes shall be clean and all air ducts free from debris. Wander hoses, drain-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 manufactur
13、er when the machine is in its normal operating condition. It is important to 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 est
14、ablishing the drive ratio of any gearbox or pulley arrangement, or preferably 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 atmosphe
15、re. If an electronic manometer is used, first ensure that it is calibrated to 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 t
16、he straightest section of the conduit to ensure minimum turbulence. There shall, 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
17、 of 20 C (68 F). Barometric pressure shall also be recorded so that corrections 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. FIGURE 1TEST SE
18、T-UP The pitot tube shall have 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
19、the conduit axis. Velocity 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 h
20、ence air flow velocity and volume may be calculated based on the ducts cross-sectional area. SAE J1792-1 Revised JUL2002 -3- 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 t
21、he direction pointer on the tail of the pitot tube (this points in the same direction to the pitot probe). FIGURE 2PITOT 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
22、side holes in the pitot tube to the manometer, leaving the 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
23、for correction of duct depression. The negative pressure (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
24、 length of small diameter tubing into the hopper via the 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. 4.3Res
25、ults TabulationThe 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 3RESULTS TABULATION SAE J1792-1 Revised JUL2002 -4- 4.4CalculationsSee Equations 1 to 6. (Eq. 1) (Eq. 2) (Eq. 3) (Eq. 4) (E
26、q. 5) (Eq. 6) NOTECorrections may also 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
27、 tests should be aborted. 4.5Typical Test Summary FormatThe calculated results together with the operational criteria may be formally presented in the format shown in Figure 4. Average velocity head (in mm H2O) 2 n 12 -= Correction for temperature (correct to 20 C) ambient temperature (C) + 273 293
28、-= Correction for barometric pressure correct to 1013 mbsea level() 1013 barometric pressure (mb) -= Correction for duct depression correct to std. density() 10363 10363static depression (mm H2O) in test duct+ -= Air Velocity in duct (m/s) 4.0321( )2( )3( )4( ) (multiply by 196.8 to convert m/s to f
29、t/min) = Volume of conveying air (m3/s) 5( )duct cross section (m2) (multiply by 2118.9 to convert m 3/s to cfm) = SAE J1792-1 Revised JUL2002 -5- FIGURE 4TYPICAL TEST SUMMARY FORMAT 5.Notes 5.1Marginal IndiciaThe change bar (l) located in the left margin is for the convenience of the user in locati
30、ng areas where revisions have been made to the previous issue of the report. An (R) symbol to the left of the document title indicates a complete revision of the report. PREPARED BY THE SAE MACHINE TECHNICAL COMMITTEE SC2 SWEEPER, CLEANER, AND MACHINERY SAE J1792-1 Revised JUL2002 RationaleThe chang
31、e to this document was to Equation 4. Some of the information from Equation 3 was inadvertently used in Equation 4 when the documents were converted for Electronic purposes. Relationship of SAE Standard to ISO StandardNot applicable. ApplicationThe SAE Standard establishes a method of disclosing the
32、 suction air volume and suction/blower fan performance of self-propelled sweepers that use pneumatic conveyance menas for the transfer of “sweepings” into a collection hopper. Reference Section SAE J2130Self-Propelled Sweepers Developed by the SAE Machiney Technical Committee SC2Sweeper, Cleaner, and Machinery Sponsored by the SAE Machine Technical Committee