JB/T 8818-1998 JB/T 8818-1998 Technical requirements for diesel engine injector assembly JB/T8818-1998 Standard download decompression password: www.bzxz.net

IC5 43.060.40
Machinery Industry Standard of the People's Republic of China
JB/8818-198
Technical requirements of nozzles and loadcases of diesel engines
Technical requirements of nozzles and loadcases of diesel engines1998-09-30 Issued
National Bureau of Machinery Industry
1998-12-01 Implementation
JB/TB818-1998
Standard is a revision of GB5769-B6 "Technical requirements of diesel engine injector assembly". Compared with GB5769-6, the following ten major technical contents have been modified: The flow grouping of the fuel injector used on the diesel engine is unified with B/T51172-4 "Quality classification of diesel engine injector assembly products", and the calculation formula has been added. During the fuel injector quality inspection, the number of fuel injections per minute is changed from 40 to 80 times, and the test speed is increased to 60 to 10 times: it is closer to the actual performance of the fuel injector, and the test speed is increased. This standard incorporates JRT71-95, the limit value of cleanliness of fuel pump nozzles for oil engines, and JBT5183-3, the "Reliability Assessment and Evaluation Method for Fuel Injector Assemblies", and improves the standard content, and improves the technical indicators and
This standard was originally issued from the date of implementation. This standard was proposed and coordinated by the Oil Pump Nozzle Standardization Technical Committee of the Ministry of Machinery Industry. This standard starts from the date of implementation: No 1. Ganfu Group Co., Ltd., Machinery Industry Ministry Oil-free System Research Institute, this standard was drafted by: Wu Guangming, Yang Guiying, Zheng Peiya, first issued in October 1974, and first revised in January 1986. This standard was commissioned by the Machinery Industry Ministry Oil-free System Research Institute to develop, and is applicable to the Machinery Industry Standard of the People's Republic of China for Diesel Engine Injector Assembly. Relevant documents of nozale fndholder asserblies of diesel engines8818-199
This standard specifies the technical requirements, test methods, marking, installation, packaging and storage of closed-type fuel injectors for medium and small power diesel engines (hereinafter referred to as injectors). It is applicable to injectors for medium and small power diesel engines. Cited standardsbzxZ.net
The following standards contain clauses, which constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should consider the possibility of using the latest version of the following standards. (B252—91
GB202189
GB 2828—87
GD2829B7
GO602987
B6293-.92
JB/T7296-94
JB/T 7297-94 :
JB/T 7661-95
Light diesel oil
Military pressure diesel oil
Batch inspection bucket number sampling procedure and sampling table (applicable to continuous batch inspection) Periodic inspection count sampling procedure and sampling table (applicable to the inspection of cattle production process stability) Fuel injection pump oil
Technical system of pressure oil sensor tester
Technical conditions for diesel engine fuel injection nozzle pairs
Performance test method for fuel injection nozzle pairs of diesel engine
Diesel Oil residual oil end product cleanliness value determination method JB/TS121-1995
Oil engine fuel injection test system high pressure pipe assembly JR/T51183--94
3 Technical requirements
Fuel injector assembly feasibility evaluation method, test methods, fault classification and evaluation rules Oil pump test price technical conditions
Note: It should be manufactured according to the production station drawings and technical documents of the specified procedures, and the evaluation box should meet the requirements of this standard. 1.2 When using the fuel tank specified in HG825?: GB2021, the fuel injector assembly shall ensure normal operation. 3.3 The spray needle shall be opened in accordance with the agreement between the user and the slag making plant. The limit deviation is + [Pa3.4 The needle of the spray nozzle should have good sliding performance in the needle valve, 3.5 The spray quality of the spray nozzle should meet the requirements of the lower speed, 3.5.1 The oil sprayed by the spray nozzle should be in the form of a certain shape, without obvious visible oil particles, continuous pooling and unevenness.
Approved by the State Machinery Industry Bureau on September 30, 1998, implemented on December 1, 1998
JR/T 8818-1998
3.5.2 The start of the injection should be obvious, and there should be a special sound or a warning that meets the structural characteristics of the nozzle. 3.5.3 It is allowed to use the injector samples agreed with the user for comparative evaluation. 3.6 The injection coupling of the fuel injector shall not have oil accumulation on the surface or head at the beginning and end of the injection. 3.? There shall be no oil drop phenomenon at the seals of the fuel injector. 3.H The cleanliness limit of the fuel injector shall comply with the provisions of JH/7661: 3. The flow rate and deviation of the fuel injector shall comply with the provisions of the technical documents approved by a certain procedure. The flow value of the fuel injector used on the multi-cylinder fuel engine shall be agreed upon by the user and the manufacturer. The flow value can also be grouped. The flow deviation of the light flow value of the injection nozzle in a group of fuel injection nozzles from the half-average flow value shall not exceed +3%: The flow deviation is calculated according to the formula:
8 - 22-2 100%
Formula only:. The maximum flow value of one sample (in the same group): 2 The maximum flow value of two samples (or groups): - the average flow value of the sample (or group). 3.10 The determination method of injector reliability assessment shall comply with the provisions of Chapter 3 of JB/T51183-94. 3.11 Under the conditions specified in the user manual, the warranty period of the injector is 1 year from the date of leaving the factory, and the cumulative working time shall not exceed 2000. If the injector is damaged or cannot be used normally due to the manufacturer's replacement within the warranty period, the manufacturer shall reduce the warranty period of the injector nozzle parts in accordance with the provisions of 3.16 of JB/T7296-94. 4 Test method
4.1 Test conditions
When conducting tests 4.2 to 4.7, the test conditions shall be met. 4.1.1 Test equipment and instruments
4.1.1.1 The manual injector tester shall comply with the provisions of 62. The length of the external pressure oil pipe shall not be less than 60 mL, the outer diameter shall not be less than 6 mm, and the inner diameter shall not be less than 2 mm.
4.1.1.2 The pressure range on the test bench shall be 0~40 MPa, and the accuracy shall not be lower than T1.5 level. 4.1.2 The test oil should be in accordance with the 0# light lubricant specified in GB252: 4.1 Injector needle opening force test
4.1.1 In the special test room, the pressure knife and the needle valve are tested together. The test value should be in accordance with B6293: 4.1.2 First, quickly flush the injector several times, then slowly press down the oil pump several times to see the pressure gauge pointer. When the injector starts to spray, the needle suddenly drops to the highest pressure value indicated before, which is the injector valve opening force. 4.3 Test of the sliding property of the needle in the injector nozzle 4.3.1 When checking on the pressure injector tester as specified in Japanese 6291, move the oil pump to make the injector spray 30-40 times per minute. When testing on the machine test piece, increase the injection rate by 1-2 MFa per second (every 28 injections! The sliding property of the injector in the valve is tested. 4.3.2 The needle sliding property tester is allowed to compare with the test sample. 4.4 Test of the injector quality
JB/T881B—1998
4.4.1 The oil dissolution disk test is carried out on the hand pressure injector tester or the machine pump test bench. 4.4.2 At the end of the test, the injection opening pressure of the injector is The opening pressure used on the fuel injection machine is tested with the injection number of 60-80 times/m.
4.5 The sealing test of the sealing cone surface of the fuel injection nozzle of the fuel injection nozzle is carried out in accordance with the provisions of 3.5 in JB/T7297-94. 4.6 The sealing test of each seal of the fuel injector is carried out on the test bench 1 specified in JB/T7293.1 to observe whether each seal is connected with oil. For fuel injectors with a needle valve opening pressure less than or equal to 17.5MPa, within 59 seconds when the needle valve opening pressure is lower than the specified opening pressure of 1MPa, for fuel injectors with a needle valve opening pressure greater than 17.5MPa. Within 4s when the needle valve opening pressure is lower than the specified opening pressure of 1MPa, the maximum allowable pressure is reduced to 25% of the specified needle valve opening pressure value. 4.! The performance tests of the tester shall be carried out on the test bench, and the inspection quality shall meet the requirements of the manual pressure type fuel injector tester acid test.
4. Determination of fuel injector cleanliness
The determination method of fuel injector cleanliness shall be in accordance with the provisions of ISO 7661. 4.9 Fuel flow test
4.9.1 The injection flow test can be carried out on the same sub-pump of the electronic fuel injection system on the fuel system test bench, or it can be carried out on a special test bench. 4.9.2 The oil used for acid test shall comply with the 0# light diesel oil specified in GB352 or the calibration pump oil specified in 0B8029. 4.9.3 The test conditions shall comply with the provisions of JBT8121. The fuel injection pump test bench shall comply with the provisions of ZBJ94016. 4.10 The bench test method of the fuel injector shall comply with the provisions of Chapter 4 of JBT51183-94. 5.1 Each injector must be inspected by the quality inspection department of the manufacturer. It can only be released after it passes the inspection. 5.2 The user's inspection, sampling rules and the judgment of whether it passes the inspection shall be in accordance with the relevant provisions of B2828, the sampling rules for type inspection and the judgment of whether it passes the inspection shall be in accordance with the relevant provisions of GR2829. 6. Marking, packaging, transportation and storage 6.1 Marking Each injector shall be marked with the manufacturer's name or trademark in a visible position! The product model or code shall remain clearly identifiable during the service life. 6.2 Packaging 6.2.1 The injector shall be equipped with protective equipment (protective sheets, protective cloths, etc.) to prevent the inner cavity from being contaminated. .2.2 When the spray nozzles are packed in cartons, they should be packed in strong packaging lined with flow-aiding materials. Each package is accompanied by a list of qualified products signed by the inspector and relevant export documents. The following should be marked on the outer surface of the packaging: a) Product name: b) Product model: c) Standard number: d) Manufacturer's factory logo or trademark; e) Number of units: 1) Manufacturer's name; 2) Packing date (year, month); h) Transport protection mark, JB/T8818-1998 6.2.1 The separate packaging of the injectors fixed with the fuel rack can be carried out according to the supply agreement. 6.3 Transportation The packaging should fully ensure that the spray nozzle will not be damaged or damaged during transportation. 6.4 Storage
The oiler should be placed in a dry warehouse and should not be stored together with acid, carbon or other corrosive chemicals. Under the condition of positive belt replacement, the manufacturer should ensure that the product will not be corroded within one year from the date of leaving the factory.
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