JB/T 10320-2002 Silicon nitride heating elements for household and similar electric heating appliances
Some standard content:
ICS29.120
2002-07-16
JB/T103202002
2002-12-01
This standard is a special technical standard for silicon nitride ceramic electric heating elements for household and similar electric heating appliances. JB/T10320-2002
The safety requirements of this standard are based on GB4706.1-19986 "General Safety Requirements for Household and Similar Electrical Appliances", and the performance requirements refer to JB/T4088-1999 "Metallic Tubular Electric Heating Elements" and JB2379-1993 "Metallic Tubular Electric Heating Elements", and the characteristics of silicon nitride ceramic electric heating elements are re-examined. Appendix A of this standard is an informative appendix.
This standard is proposed by the China Machinery Industry Federation and is under the jurisdiction of the Guangzhou Electric Science Research Institute. This standard was drafted by Guangzhou Shichao High-Performance Ceramics Corporation Guangzhou Electric Science Research Institute. The main drafters of this standard are Chen Changming, Li Shihong, Xu Yanrong, Wu Tiande, Tian Kezhen. 1 Scope
JB/T10320-2002
Silicon nitride electric heating elements for household and similar electric heaters This standard specifies the terms and definitions, product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements of silicon nitride electric heating elements (hereinafter referred to as electric heating elements) for household and similar electric heating appliances. This standard is applicable to electric heating elements with AC and DC operating voltage not exceeding 480V. This standard is applicable to the surrounding environment without flammable, explosive and conductive dust: no obvious mechanical impact 2 Normative reference documents
The clauses in the following documents become the clauses recommended by this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this standard. GB2900.29—1984 Electrical terminology - Electrical appliances GB4706.1—1998 Safety of household and similar electrical appliances - Part 1: General requirements (CQV-C60335-1) GB 4706.12—1995 Safety of household and similar electrical appliances - Part 2: General requirements (CQV-C60335-1) GB 4706.12—1995 Safety of household and similar electrical appliances - Part 3: General requirements for water-type electric water heaters (IDT IEC60335-2-21
GB/T 6569-1986
5 Methods of testing the flexural strength of engineering ceramics
3 Terms and definitions
The terms and definitions established in GB2900.29 and GB4706.1 and the following terms and definitions apply to this standard. 3.1
Silicon nitride heating elementsiliconnitrideceramicheatingelementAn electric heating element with silicon nitride ceramic as the matrix, silicon nitride ceramic as the insulating medium, and alloy heating wire as the heat source. 3.2
Heatinglength
The length of the heating part on the electric heating element.
Bending strengthbendingstrength
The maximum stress when the tensile surface of the short section cut from the electric heating element breaks under the action of bending stress: 3.4
Simulatingconditionsimulatingcondition
Under the conditions of each chapter of this standard, some measures are taken to make the average temperature value of the working surface of the electric heating element basically consistent with the T working temperature.
Damage
A component is considered damaged if any of the following conditions occur: a) The electrical strength of the heating component is lower than the allowable value; b) The leakage current of the heating component is greater than 0.5 mA; c) There are cracks on the surface of the heating component.
JB/T10320—2002
4 Product classification
4.1 Classification and specifications
4.1.1 Products according to installation and electrode lead-out form a) Plug-in type, typical structure is shown in Figure 1
Resistance wire: 2-
Nitride matrix: 3
Interrupter: 4
Figure 1 Schematic diagram of typical structure of plug-in type
b) Lead type, typical structure is shown in Figure 2:
Resistance wire: 2-
|Silicon nitride substrate: 3-
Heat shrink tube: 4-
Figure 2 Schematic diagram of typical structure of lead type
Flange type, typical structure is shown in Figure 3;
Body: 2-
Flange: 3-
Lead: 4-
Thermowell 1: 5
Figure 3 Schematic diagram of typical structure of flange type
Insert:
One conductor:
Thermowell 2
Other structural forms shall be agreed upon by both supply and demand parties. 4.1.2 Rated power
JB/T10320—2002
The preferred rated power of the product at 220V rated voltage is: 500W, 700W, 1000W, 1400W, 1500W, 2000W, 2500W, 2800W, 3000W, 3200W, 3500W. 4.2 Model of electric heating element
The model of electric heating element is indicated as follows:
Improved design code, the specification code is indicated by English letters (A, B, C-) in sequence, the structure code is indicated by 1/100 of the rated power (W), C indicates plug-in type, Y indicates lead type: F indicates flange type, etc. The name code of nitride-based electric heating element is indicated by "DG". For example: DGC-15A indicates silicon nitride electric heating element, plug-in type, power is 1500W. The first improved design. 4.3 Main parameters of electric heating elements
The main parameters of electric heating elements are as follows;
a) Rated voltage, in V;
b) Rated power, in kW or w:
Overall dimensions, in mm:
d) Weight, in g
5 Technical requirements
5.1 General requirements
Electric heating elements shall comply with the requirements of this standard and shall be manufactured in accordance with the drawings and technical documents approved in the prescribed procedures: 5.2 Safety and health requirements
5.2.1 Rated power Deviation
The deviation of the input power of the heating element from the rated power at rated voltage and normal operating temperature shall not be greater than the deviation shown in Table 1 Table 1
Rated input power W
>25~~20)
5.2.2 Leakage current
: 54 or 20W (select the larger value)
a) The leakage current of the heating element at room temperature, under normal working conditions and after the moisture resistance test shall not exceed 0.51I1A, b) The leakage current of the heating element in water after breaking shall not exceed 10mA. 5.2.3 Electrical strength
The insulation of the heating element shall be able to withstand an electrical strength test of 50Hz (basically a sine wave) for 1nin: Test voltage: 2500V at room temperature: 1500V under normal working conditions and after the moisture resistance test. During the test, no breakdown or flashover should occur. 5.2.4 Overload capacity
The electric heating element shall be subjected to 30 cycles of overload test without damage under the condition that the input power is 1.27 times of the rated power. 5.2.5 Flame resistance and aging resistance
The non-metallic materials used for insulation and sealing shall be flame resistant, and the rubber materials shall be aging resistant. 5.2.6 Creepage distance and electrical clearance of the terminal The creepage distance and electrical clearance of the terminal shall comply with the provisions of Chapter 29 of GB4706.1-1998, 3
JB/T 10320-2002
5.2.7 Hygiene requirements
The electric heating element shall be non-toxic, harmless, odorless, and non-deteriorating in long-term use, and shall comply with the provisions of relevant national health standards. 5.3 Performance requirements
5.3.1 Bending strength
The room temperature bending strength (c) of the electric heating element shall be greater than 800MPa. 5.3.2 Manufacturing requirements
5.3.2.1 Components equipped with flanges or fastening devices and used to heat liquids with joints installed below the liquid level should be able to withstand a hydrostatic pressure test of 1.2MPa or 0.3MPa for 5 minutes without any leakage. Water resistance marks (0.6MPa or H, 0.1MPa or P) should be marked respectively. 5.3.2.2 The single connecting wire or single pole of the connecting plug of the electric heating element should be able to withstand a tensile test of 100N for 3 minutes without any breakage or displacement.
5.3.2.3 The electrode parts of the electric heating element should be effectively sealed and should pass the test of 6.5 of this standard. 5.3.3 Appearance
The surface of the electric heating element should be intact and free of obvious defects. 5.3.4 Working life
Under normal working conditions, the working life should not be less than 5000h (excluding cooling time), and the components should not be damaged after the test, but the voltage value of the electrical strength test is allowed to be reduced by 50%
6 Test method
6.1 General requirements for the test
6.1.1 The electric heating element is tested under the following normal working conditions! Ambient temperature 20℃ + 5℃, relative humidity not more than 85%; no external airflow, no strong radiation. b) The power supply voltage is an AC sine wave, and the voltage and frequency fluctuation range shall not exceed ±1%. The normal working state is: install the electric heating element in the test device (see Figure 4), or under simulated conditions, the heating C
length part of the electric heating element is completely immersed in water, and the outlet flow is not less than 4L/min. Electric heating element
Water outlet
Tap water
Water inlet
Metal plate
Sealing glue diagram
A nail
Figure 4 Schematic diagram of electric heating element test device
6.1.2 Instruments used for testing:
a) The accuracy of electrical measuring instruments used for type testing should not be lower than 0.5 level, and that used for factory inspection should not be lower than 2.5 level. b) The accuracy of instruments used to measure temperature should be within 0.5℃ (1.0℃ can be used for factory inspection). 4
c) The accuracy of instruments used to measure time should be within 0.1s, d) The allowable error of measuring tools for measuring length is within ±0.5 of the measured length. The accuracy of instruments for measuring pressure should not be lower than 2 levels.) Mechanical properties testing equipment: The force value error should not exceed 1%. 6.2 Measurement of rated power
JB/T 103202002
Make the heating element work at rated voltage and working state, measure rated power, which shall meet the requirements of 5.2.1 of this standard. 6.3 Measurement of leakage current
6.3.1 Leakage current at room temperature
Make the heating element at room temperature, do this test without connecting the power supply, and conduct the test in accordance with the method specified in 16.2 of GB4706.1-1998. The test voltage is 1.06 times of the rated voltage. Measure the leakage current within 5s after applying the test voltage. The measurement result It should meet the requirements of 5.2.2 of this standard
6.3.2 Leakage current under normal working condition Make the electric heating element work under normal working condition, the test voltage should be adjusted to make the input power equal to 1.15 times of the maximum rated input power, measure the leakage current, the measurement method is as specified in 13.2 of GB4706.1-1998, and the measurement result should meet the requirements of 5.2.2 of this standard. 6.3.3 Leakage current after humidity resistance test
The test should be carried out when the electric heating element is not connected to the power supply and after the humidity resistance test is completed. The test is carried out according to the method specified in 16.2 of GB4706.1-1998, the test voltage is 1.06 times the rated voltage, and the leakage current is measured within 5s of applying the test voltage. The measurement result should meet the requirements of 5.2.2 of this standard.
6.3.4 Leakage current in water after breaking
After breaking the sample perpendicular to the cross section at any position within the heating length range, immediately measure it with the test device shown in Figure 5. The applied voltage is 1.06 times the rated positive voltage. The result should meet the requirements of 5.2.2 of this standard. Gold dissolver (discarded volume 2L)
Breakage caused by heating
Bai Lai water·
Xie Zhongliu
Figure 5 Schematic diagram of the leakage current test device after the electric heating element is broken 6.4 Electric strength test
6.4.1 Electric strength at millisecond temperature
After the test in 6.3.1 of this standard, it shall be carried out in accordance with the provisions of 16.2 of GB4706.1--1998. The set current of the electric strength test equipment is 5mA. The result should meet the requirements of 5.2.3 of this standard. 6.4.2 The electrical strength test under normal working conditions shall be carried out immediately after the test in 6.3.2 of this standard in accordance with the provisions of 13.3 of GB4706.1-1998. The set current of the electrical strength test equipment is 5mA, and the results shall meet the requirements of 5.2.3 of this standard. 6.4.3 Electric strength after moisture resistance test
The test shall be carried out immediately after the test in 6.3.3 of this standard in accordance with the provisions of 16.3 of GB4706.1-1998. The set current of the electric strength test equipment is 5mA. The result shall meet the requirements of 5.2.3 of this standard. 5
JB/T 10320-2002
6.5 Moisture resistance test
The test shall be carried out in accordance with the method specified in 15.3 of GB4701-1998, and then the tests in 6.3.3 and 6.4.3 of this standard shall be carried out immediately. 6.6 Overload capacity test
Connect the electric heating element to the power supply in the positive working state, adjust the voltage so that the input power reaches the specified value: power on for 1H, then power off and cool for 5min, and power on and off for 30 times. The result shall meet the requirements of 5.2.4 of this standard. 6.7 Water pressure test
Install the electric heating element in a sealed container in the normal installation state, and conduct a water pressure test according to the method specified in 22.101 of GB4706.12:1995. The result should meet the requirements of 5.3.2.1 of this standard. 6.8 Tensile test of connecting wire or connecting plug Fix the electric heating element, and then hang the set weight (including the accessories required for hanging to the reverse connection joint) vertically on a single connecting wire or a single pole of the connecting plug for 3 minutes, and then conduct a visual inspection. The result should meet the requirements of 5.3.2.2 of this standard. 6.9 Appearance inspection
Conduct a visual inspection, and the result should meet the requirements of 5.3.3 of this standard. 6.10 Working life test
Connect the electric heating element to the rated voltage in the normal working state, power on for 1 hour, and then power off for 2 minutes. The cumulative working time (excluding power-off time) reaches 5000 hours. The result should meet the requirements of 5.3.4 of this standard. 6.11 Geometric Dimension MeasurementWww.bzxZ.net
The geometric dimensions of the heating element are measured with a vernier caliper. The results shall meet the requirements of 5.1 of this standard. 6.12 Determination of Flexural Strength
The heating element is cut and cold processed into a test strip of 3mm×4mm×40mm. The 3-point flexural strength at room temperature is measured in accordance with the provisions of GB/T6569-1986. The results shall meet the requirements of 5.3.1 of this standard. 6.13 Burnout Test
The non-metallic materials used for sealing shall be tested in accordance with the requirements of 30.2 of GB4706i.1-1998. 6.14 Aging Test
The rubber parts used for insulation and sealing shall be tested in accordance with the provisions of GB4706.1-199822.32. 6.15 Filtering distance and sliding gap
The filamentary distance and creepage gap of the terminal block shall be measured in accordance with the provisions of Chapter 29 of GB4706.1-1998. 6.16 Hygiene requirements
The electric heating element shall be tested in accordance with the relevant national health standards of the application environment. 7 Inspection rules
Each product shall be inspected and qualified by the quality inspection department of the manufacturer before it can be shipped, and a quality inspection certificate shall be attached. Product inspection is generally divided into factory inspection and type test. 7.1 Factory inspection
All products proposed for delivery shall be subject to factory inspection. The inspection items, technical requirements and test methods of factory inspection are shown in Table 2, or agreed upon by the supply and demand parties.
Inspection items
Marking inspection
Appearance inspection
Geometric dimensions
Rated power
Hydraulic pressure test
Measurement of slip current under room excitation
Electrical strength test at room temperature
Technical requirements
Test method
7.2 Type test
7.2.1 Type test shall be carried out in any of the following cases: a) Trial production of new products:
b) When there are major changes in design, process, materials, etc.; when the production of products that have been stopped for more than one year is resumed; c
d) For products produced in continuous batches, it shall be carried out once every 2 years. Among them, the life test shall be carried out once every 4 years, and the samples for type test shall be randomly selected from the products that have passed the factory inspection and have been packaged and stored in the warehouse. 7.2.2
The products used for type test are divided into two groups. The first group takes 3 pieces, and 3 pieces are taken for each item in the first group. The test items, technical requirements and identification methods of the first group of type tests are shown in Table 3
Test items
Marking inspection
Appearance inspection
Geometric dimensions
Hydrostatic test
Sealing performance test
Rated power
Leakage current test
Electrical strength test
Overload capacity test
Technical requirements
The test items, technical requirements and test methods of the first group of type tests are shown in Table 4. Table 4
Test items
Tensile test of connecting wire or plug
Bending strength test
Working life test
Flammability test
Aging test
Creep distance, leakage distance and through insulation distance "Leakage current after breaking\
This project is tested with samples of connecting wire or plug after tensile test. Samples after type test shall not be delivered as finished products. 7.2.8
Technical requirements
JB/T10320—2002
Test method
6.3.1-~ 6.3.3
Test method
7.2.7 In the type test, any sample and any test item shall be qualified. If only one test item of one sample fails, the test is allowed to be repeated, otherwise the batch of products shall be judged as unqualified. 8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 The electric heating element must have a durability mark, and the content of the mark should include: a) factory name or trademark;
b) rated voltage:
c) rated power,
d) model.
JB/T10320—2002
Electric heating elements equipped with flanges or fastening devices and used for heating liquids, with joints installed below the liquid level, must have a mark that can withstand water pressure.
2 Packaging requirements
The packaging box should be firm and reliable, with a safe protective Shock measures. 8.2.2
Each packaging box should be marked with:
a) Manufacturer name, trademark, address and telephone number b) Product name, model specifications and quantity: Product standard number:
Outer dimensions of the packaging box:
e) Gross weight:
Date of manufacture.
The product should avoid collision and moisture during transportation: Storage
The product should be stored in a place with good air circulation and no corrosive gas. 8
Appendix A
(Informative Appendix)
The maximum surface load allowed for electric heating elements in common media Recommended use value Surface load Wicm
JB/T10320—2002
Heating medium, heating characteristics and code
Water, weak acid, weak alkali solution
Positive child gas Q
Flow rate is not less than 6m/s Air
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