1、BRITISH STANDARD BS 6347-8: 1993 ISO 789-8: 1991 Performance assessment of agricultural tractors Part 8: Method of testing engine air cleaners UDC 631.372-73:620.1BS6347-8:1993 This British Standard, having been prepared under the directionof the Agricultural Machinery and Implements Standards Polic
2、y Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15January1993 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference AGE/6 Draft for comment 90/74610 DC ISBN 0 580 21603 9 Committees responsible for this British S
3、tandard The preparation of this British Standard was entrusted by the Agricultural Machinery and Implements Standards Policy Committee (AGE/-) to Technical Committee AGE/6, upon which the following bodies were represented: Agricultural and Allied Workers National Trade Group Agricultural Engineers A
4、ssociation British Agricultural and Garden Machinery Association Ltd. County Surveyors Society Department of Transport Forestry Commission Health and Safety Executive Local Authority Organizations Ministry of Agriculture, Fisheries and Food National Farmers Union Silsoe Research Institute United Kin
5、gdom Softwood Sawmillers Association Coopted member Amendments issued since publication Amd. No. Date CommentsBS6347-8:1993 BSI 09-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative reference 1 3 Definitions and units 1 4 Measurement accuracy 1
6、5 Test materials and test conditions 1 6 Resistance to vibration 1 7 Effect of servicing of dry air cleaners 3 8 Resistance to fibrous material 4 9 Resistance to moisture of dry air cleaner elements 4 10 Safety element 4 11 Angle of operation of oil-bath air cleaners 5 12 Automatic dust unloading va
7、lves 5 13 Reports 5 Annex A (normative) Test report 6 Figure 1 Attachments and mounting for vibration test 2 List of references Inside back coverBS6347-8:1993 ii BSI 09-1999 National foreword This Part of BS 6347has been prepared under the direction of the Agricultural Machinery and Implements Stand
8、ards Policy Committee. It is identical with ISO789-8:1991 Agricultural tractors Test procedures Part8: Engine air cleaner published by the International Organization for Standardization (ISO). ISO789-8was prepared by Subcommittee SC2, Common tests, of ISO Technical Committee23, Tractors and machiner
9、y for agriculture and forestry. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-ref
10、erences International Standard Corresponding British Standard ISO 5011:1988 BS 7226:1989 Methods of test for performance equipment of inlet air cleaning equipment for internal combustion engines and compressors (Identical) Summary of pages This document comprises a front cover, an inside front cover
11、, pages i and ii, pages1to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS6347-8:1993 BSI 09-1999 1 1 Scope This part of ISO789specifies t
12、est procedures for engine air cleaners fitted to agricultural tractors which are additional to those specified in ISO5011. Additional tests are necessary because of the special conditions under which engine air cleaners fitted to agricultural tractors must operate. 2 Normative reference The followin
13、g standard contains provisions which, through reference in this text, constitute provisions of this part of ISO789. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of ISO789are encouraged to investigate
14、the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO5011:1988, Inlet air cleaning equipment for internal combustion engines and compressors Performance testing. 3 Definitions and
15、 units For the purposes of this part of ISO789, the definitions and units contained in ISO5011:1988, Annex A apply with the following addition. 3.1 safety element air cleaner element fitted downstream of a primary, barrier-type element for the purpose of providing the engine with protection against
16、dust in the event of either any type of primary element failure, or dust being present during the removal of the primary element for servicing 4 Measurement accuracy 4.1 Measurements shall be made, where they are given, to the accuracy specified in ISO5011:1988, clause4. 4.2 Measure vibration accele
17、ration within2 %, amplitude within3 % and frequency within5 %. 4.3 Measure angles within1 . 5 Test materials and test conditions Test materials and test conditions shall be as specified in ISO5011:1988, clause5, unless otherwise stated. 6 Resistance to vibration 6.1 Introduction 6.1.1 This part of I
18、SO789specifies a method of testing the constructional integrity of air cleaner assemblies to withstand engine or installation vibration. 6.1.2 The test values stated are intended as a guide and may be varied at the discretion of the air cleaner supplier and tractor manufacturer, particularly if actu
19、al tractor vibration data is available. 6.2 Operational characteristics to be tested The following tests establish the ability of the air cleaner assembly to withstand vibration, in three mutually perpendicular planes, for a predetermined number of cycles (see Figure 1).BS6347-8:1993 2 BSI 09-1999 F
20、igure 1 Attachments and mounting for vibration test (see6.4.1 to6.4.3)BS6347-8:1993 BSI 09-1999 3 6.3 Test rig 6.3.1 Electro-mechanical vibrator, together with sinusoidal oscillator and frequency controller, amplifier and display unit to indicate displacement, velocity and acceleration. 6.3.2 A mini
21、mum of two accelerometers, featuring linear calibration over a range of 100 m/s 2to + 100m/s 2 . 6.3.3 Air cleaner assembly to be tested, together with inlet pipe and cap (or precleaner if fitted and mounting straps or brackets, if available). The mass of a dust-laden element shall be included. 6.3.
22、4 Rigid adaptor plate and brackets to enable air cleaner assembly to be mounted on the vibrator in triaxial planes. 6.4 Preparation and test procedure 6.4.1 Mount the air cleaner assembly onto either the rigid adaptor plate or one of the brackets (6.3.4). 6.4.2 Rigidly mount the adaptor plate/bracke
23、t on the vibrator (6.3.1), ensuring that the axis of excitation is at right angles to one of the air cleaner assembly triaxial planes. 6.4.3 Attach one accelerometer (6.3.2) to the rigid adaptor plate/bracket (to record input signal) and a second accelerometer to the air cleaner body diametrically o
24、pposite the adaptor plate/bracket (to record output signal). Additional accelerometers may be attached to any other part of the assembly which is observed to be resonating during the following tests. Attention should be paid to the precleaner/rain cap and to the internal parts of the cleaner insofar
25、 as they can be observed by sight or sound. 6.4.4 Conduct a resonance search up to a frequency of200Hz in the following stages: a) up to13Hz at an amplitude of 0,6mm; b) from13Hz to94Hz at a velocity of50mm/s; c) from94Hz to200Hz at an acceleration determined from the formula a = 30 + 0,3 (f 100) wh
26、ere If resonance occurs at one frequency, carry out the test at that frequency and at the amplitude, velocity or acceleration, as appropriate, as specified above for the resonance search. If resonance occurs at more than one frequency, carry out the test, as above, at the frequency which exhibits th
27、e maximum amplitude. If resonance does not occur at a frequency below200Hz, carry out the test at a frequency of60Hz and an acceleration of25m/s 2 . 6.4.5 Test the assembly to a total of10 7cycles unless prior failure occurs. Commence testing at the frequency and acceleration values as determined in
28、6.4.4. As the resonant frequency of the assembly under test may vary throughout the test, the acceleration should be adjusted to the values determined in6.4.4 after each2,5 10 6cycles. 6.4.6 If10 7cycles are completed without apparent failure, remove the air cleaner assembly and inspect for any visu
29、al signs of external damage. 6.4.7 Repeat6.4.1 to6.4.6 with the air cleaner assembly mounted in the other two planes. In each test, the accelerometer polar axes are to be in line with the axis of excitation. 6.4.8 Without disturbing the assembly, remove it from the vibrator and carry out a full life
30、 efficiency and capacity test as specified in ISO5011:1988, clause7.5 or8.5 as appropriate. With the agreement of the air cleaner supplier and the tractor manufacturer, the vibration test and the performance test may be carried out simultaneously. 6.5 Results to be recorded The test report (see clau
31、se13) shall indicate at least the following: a) the amplitude and frequency of vibration; b) the mode of failure and its location (if any); c) torques applied to fixing initially and at the end of the test; d) the number of cycles to failure or the number of cycles completed; e) the result of the fu
32、ll life efficiency and capacity test. 7 Effect of servicing of dry air cleaners 7.1 Purpose This clause specifies a method of determining whether the air cleaner element can withstand the manufacturers approved method of servicing, for the recommended number of times, without its performance droppin
33、g below an acceptable level. 7.2 Test procedure Carry out a full life efficiency and capacity test as specified in ISO5011:1988, clause7.5. Service the air cleaner according to the manufacturers instructions. Repeat the tests and continue this procedure until the air cleaner has been serviced for th
34、e maximum number of times recommended by the manufacturer before replacement. Record the results of each test separately to indicate any progressive deterioration of performance. a is the acceleration, in metres per second squared; f is the frequency, in hertz.BS6347-8:1993 4 BSI 09-1999 8 Resistanc
35、e to fibrous material 8.1 Purpose The purpose of this test is to determine the effect of fibrous material on the air cleaner, e.g. clogging of precleaner vanes, screens or other small apertures. It may be carried out on dry or oil-bath air cleaners. 8.2 Fibrous material Two fibrous materials shall b
36、e used: a) dry, well ripened, cat pods, hand-stripped from the stalk (also known as Bull Rush seeds, Typha angustifolia); b) dry cotton lint, ranging in fibre length from3mm to30mm, dried to less than10 % moisture. The cotton lint collected from the inlet of the engine radiator of a cotton picker or
37、 cotton stripper will be suitable. Other materials such as leaf particles and dust will be included in cotton lint collected in this manner, but such inclusion is not objectionable in this test material. 8.3 Fibrous material preparation Before using the fibrous material, a quantity sufficient to cov
38、er the test requirements shall be teased out and allowed to stabilize at a temperature of (23 5) C and (55 15) % relative humidity for2h. 8.4 Test procedure 8.4.1 The test consists of the determination of the pressure drop/capacity characteristic. 8.4.2 Weigh out a quantity of fibrous material agree
39、d between the user and manufacturer. 8.4.3 Start the air flow through the stand and stabilize it at the test air flow. Record the pressure drop. 8.4.4 Feed 10g 15 % of the fibrous material per cubic metre of air flow. 8.4.5 Terminate the fibrous material feed when the specified pressure drop agreed
40、between the user and manufacturer has been reached or the test quantity has been fed into the air cleaner. 8.4.6 Weigh the remaining fibrous material (if any) and hence determine the quantity fed into the air flow. 8.4.7 After completion of the test, examine the unit to determine whether the fibrous
41、 material has collected at a point upstream of the element and, if so, report its location. 9 Resistance to moisture of dry air cleaner elements 9.1 Purpose The purpose of this test is to determine the effect, if any, of moisture on the functioning of the air filter. 9.2 Test method 9.2.1 Test proce
42、dure 9.2.1.1 Measure the pressure drop/restriction of the element/air cleaner assembly at the test flow as specified in ISO5011:1988, clause6.3. 9.2.1.2 Remove the element to be tested and weigh it. 9.2.1.3 Immerse the element completely in clean water at the same temperature as the surroundings for
43、 approximately12h. 9.2.1.4 Allow the element to drain for15min; then gently shake to remove any loose droplets of water and reweigh it. 9.2.1.5 Re-assemble the filter unit/test rig. Increase the air flow through the element until the pressure drop/restriction reaches100mbar or the rated flow is achi
44、eved. Remove and inspect the element. Record any damage which has occurred to any of the component parts of the element or to its integrity. 9.2.1.6 Re-assemble the filter unit/test rig and run air through the filter at the rated flow until either the pressure drop or its mass return to those determ
45、ined in9.2.1.1 or9.2.1.2. If this does not occur then run the system until the mass of the element has stabilized. 9.2.1.7 Weigh the element. 9.2.1.8 Perform a dust holding capacity and overall efficiency test as specified in ISO5011:1988, clause7.5. 9.2.2 Results to be recorded The test report shal
46、l indicate the following: a) the initial mass; b) the wet mass; c) the mass of retained moisture; d) the mass after drying. 10 Safety element 10.1 Introduction The requirement of a safety element is that it should block rapidly in the event of a leak occurring in the primary element, passing a minim
47、um of dust in the process. To evaluate this, a specific penetration test shall be performed. During normal and correct operation of the air cleaning system, it is desirable that the safety element should not block during the lives of one or more primary elements. To evaluate this, a safety element b
48、locking test shall be performed. This may be carried out as part of the full life efficiency and capacity test as specified in ISO5011:1988, clause7.5.BS6347-8:1993 BSI 09-1999 5 10.2 Specific penetration test 10.2.1 Preparation Using the housing normally employed to retain the safety elements, prep
49、are a “dummy” primary element, i.e. a complete element skeleton lacking only the media, but including any swirl vane present. Fit the safety element and the dummy primary element into the housing. 10.2.2 Test procedure The test shall be conducted in accordance with ISO5011:1988, clause7.5, full life efficiency and capacity test, but with the following specifications. 10.2.2.1 The terminating condition for dust feeding shall be a pressure drop across the housing of100mbar. 10.2.2.2 The dust used shall be fine grade. Where a precleaner is provided, an
