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NB/T 10302-2019 English PDF

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NB/T 10302-2019: (Bimetallic defrost thermostat for refrigerator)
Status: Valid
Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
NB/T 10302-2019299 Add to Cart 3 days (Bimetallic defrost thermostat for refrigerator) Valid

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Basic data

Standard ID: NB/T 10302-2019 (NB/T10302-2019)
Description (Translated English): (Bimetallic defrost thermostat for refrigerator)
Sector / Industry: Energy Industry Standard (Recommended)
Classification of Chinese Standard: K32
Classification of International Standard: 97.120
Word Count Estimation: 13,120
Date of Issue: 2019-11-04
Date of Implementation: 2020-05-01
Issuing agency(ies): National Energy Administration

NB/T 10302-2019: (Bimetallic defrost thermostat for refrigerator)

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Defrost heater for refrigerator ICS 29.120.01 K 10 NB Energy Industry Standards of the People's Republic of China NB/T 10307-2019 Defrosting heater for refrigerator 2019-11-04 released 2020-05-01 Implementation Issued by National Energy Administration NB/T 10307-2019

Table of contents

Foreword...I1 1 Scope...1 2 Normative references...1 3 Terms and definitions...1 4 Classification, main technical parameters and model naming...3 5 Technical requirements...5 6 Test method...8 7 Inspection Rules...11 8 Packaging, marking, transportation, storage...13 Appendix A (Normative Appendix) Recommended maximum surface load values for components...15 Appendix B (informative appendix) Typical structure of components...16-18 Figure 1 Model representation method of aluminum tube and sheet heater...4 Figure 2 Model representation method of steel pipe heater...4 Figure B.1.1 Typical structure of the element Double-head steel pipe heater...16 Figure B.1.2 Typical structure of components Single-head steel pipe heater...16 Figure B.2.1 Typical structure diagram of the component internally connected lead type chip heater...17 Figure B.2.2 Typical structure diagram of components External connection lead type chip heater...17 Figure B.2.3 Typical structure of the component comes with a lead wire type chip heater...17 Figure B.3.1 Typical structure diagram of components External connection lead type aluminum tube heater...18 Figure B.3.2 Typical structure diagram of the component internal connection lead type aluminum tube heater...18 Figure B.3.3 Typical structure diagram of the component comes with a lead wire type aluminum tube heater...18 Table 1 Information materials for component design...5 Table 2 Power deviation range of components...5 Table 3 Specification for electrical strength requirements of components...6 Table 4 Requirement range of component lead bar size...7 Table 5 Component diameter tolerance...7 Table 6 Component factory inspection items...12 Table 7 Component Type Inspection Items...12

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by China Electrical Equipment Industry Association. This standard was proposed and managed by the National Electrical Accessories Standardization Technical Committee (SAC/TC 67). Drafting organizations of this standard. China National Electrical Equipment Research Institute Co., Ltd., Anhui Ningguo Tiancheng Electric Co., Ltd., Hefei Midea Refrigerator Co., Ltd., Zhenjiang Dongfang Electric Heating Technology Co., Ltd., Xiamen Fulan Home Appliance Technology Co., Ltd., Hisense Rongsheng (Guangdong) Bing Box Co., Ltd., Anhui Ningguo Tiancheng Electrical Co., Ltd., Guangdong Hengmei Electric Heating Technology Co., Ltd., Changzhou Simat Electric Co., Ltd. Division, Xi’an Kaiyijin Electronic Technology Co., Ltd., Xi’an Xumai Intelligent Appliance Technology Co., Ltd.; Weikai Testing Technology Co., Ltd., Jiangyin Zhixiang Electronic Technology Co., Ltd., Jiaxing Weikai Testing Technology Co., Ltd., Jiangsu Flanders Electric Appliance Co., Ltd., Ningbo Xinyuan Electronics Co., Ltd., Ningbo Catmark Smart Kitchen Co., Ltd., Zhejiang Inspection and Quarantine Science and Technology Technology Research Institute, Dongguan Ruijing Electrical Technology Co., Ltd., Jinhua Wangyuan Electronic Technology Co., Ltd. The main drafters of this standard. Kong Ruixun, Qian Jiyou, Li Yang, Tan Wei, Peng Shichang, Song Zhihong, Wang Yang, Zhang Huaiguo, Jin Caifeng, Quan Yongde, Chen Feng, Jing Yixin, Ma Zhijun, Zhang Yafei, Du Li, Dai Baiqing, Xu Hongwei, Tang Renxing, Lin Jinli, Zhang Wei. Defrosting heater for refrigerator

1 Scope

This standard specifies the terms, definitions and classification of defrost heaters for refrigerators and electric heaters for similar purposes (hereinafter referred to as "components") Class, main technical parameters and model naming, technical requirements, test methods, inspection rules and signs, packaging, transportation and storage. This standard is suitable for installation in household appliances, rated voltage below 250 V, with resistance electric heating alloy material as the heat source, through metal Heat conduction, electric heating element for power refrigerator defrosting or auxiliary heating.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB/T 1234 high resistance electric heating alloy GB/T 1804-2000 General Tolerance Tolerance of linear and angular dimensions without tolerance GB/T 2423.18 Environmental Test Part 2 Salt Spray Alternation (Sodium Chloride Solution) GB 4706.1-2005 Safety of household and similar electrical appliances Part 1.General requirements GB/T 8808-1988 Peel test method for soft composite plastic materials GB 17196-2017 Safety requirements for flat quick-connect terminals for connecting devices to copper wires GB/T 26572 Limit requirements for restricted substances in electronic and electrical products JB/T 12719-2016 Accelerated life test method for daily tubular electric heating elements

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Aluminum tube heater The metal aluminum tube is used as the heat conductor, the high resistance electric heating alloy material is used as the heating body, and the silicon rubber is used as the insulating medium between the two. The lead wire is connected to the power source for heating. 3.2 Sheet heater The metal aluminum foil is used as the heat conductor, and the high-resistance electric heating alloy material is used as the heating element. Between the two, polyvinyl chloride, polytetrafluoroethylene, silicon rubber Glue or similar insulator is used as the insulating medium, and the two ends are connected to the power supply with lead wires for heating. 3.3 Tube heater Use stainless steel as the shell, high-resistance electric heating alloy material as the heating element, and dense magnesium oxide powder or similar insulator between the two It is an insulating medium and is connected to the power supply through an extraction device for heating. 3.4 Heater A component that converts electrical energy into heat. 3.5 Lead-out rod The metal parts that have a good connection with the heating element are directly or through the plug-in piece, connecting piece, wire and other connecting devices connected to it and the electric The source is connected. 3.6 Lead-out device The collective name of the lead rod and the inserts, connecting pieces, wires and other components connected to it. 3.7 Lead-out line A wire that has a good connection with the heating element; connects to the power source directly or through a connecting piece connected to it. 3.8 Heating line Use high-resistance electric heating alloy materials as heating elements, and use polyvinyl chloride, polytetrafluoroethylene, silicon rubber or similar insulators as insulating medium, A linear heating element with an insulating protective layer extruded by an extruder. 3.9 Effective heating length The length of the effective heating part of the element heating element. 3.10 Effective heating surface The surface of the metal tube and foil corresponding to the effective heating part of the component. 3.11 Surface effective load The power per unit area on the effective heating surface of the component. 3.12 Normal operation When the component is connected to the rated power supply, it is in the working state under normal use (conditions). 3.13 Working temperature The average temperature of the effective heat-generating surface of the component when the rated power is input and in normal operation. 3.14 NB/T 10307-2019 Simulation condition Under the conditions stipulated in the various clauses of this standard, some measures shall be taken to make the average temperature of the heating surface of the element basically consistent with the working temperature Working conditions. 3.15 Damage The component is considered damaged when one of the following conditions. a) The electrical strength at the working temperature that the component can withstand is less than 75% of the normal specified value; b) The leakage current at the operating temperature of the component is greater than 3.5 mA; c) The insulation resistance of the component is lower than 2 MΩ; d) Under normal working conditions, the input power of the component is lower than 80% of the rated power or higher than 120% of the rated power; e) The pipe body produces flames, melts or other damage that cannot be repaired when the component is working. 3.16 Operation life The cumulative working time of the component from working to damage under normal working conditions. 3.17 Equivalent resistance The DC resistance of the component at operating temperature. 3.18 Heating medium A carrier that directly absorbs heat from the component. 4 Classification, main technical parameters and model naming 4.1 Classification Defrost heaters are divided into three types. aluminum tube heaters, sheet heaters, and steel tube heaters according to material characteristics. 4.2 Main technical parameters 4.2.1 The main technical parameters and units involved in the components. a) Power supply voltage, in volts (V); b) Power frequency, in Hertz (Hz); c) Rated voltage, in volts (V); d) Rated power, in watts (W); e) Working temperature, the unit is Kelvin (K) or Celsius (°C); f) Outer diameter in millimeters (mm); g) Dimensions in millimeters (mm); h) Weight in kilograms (kg); i) Heating medium. 4.2.2 Calculation method of some technical parameters. a) Surface payload The unit is watts per square centimeter (W/cm2). Surface effective load calculation formula. surface effective load = power value of the component/effective heating surface area of the component b) Equivalent resistance The unit is ohm (Ω). 4.3 Model naming 4.3.1 The model of the component is recommended to be named according to the rules specified in Figure 1 or Figure 2, or it can be named by the manufacturer. The model should reflect the uniqueness of the electrical and mechanical characteristics, size and function of the component as much as possible. 4.3.2 The model representation method of aluminum tube and sheet heater is shown in Figure 1. Rated voltage (in volts) rated input power (in watts) Design Number Insulation material code (J is polyvinyl chloride, G is silicone rubber, F is polytetrafluoroethylene) Purpose (R is electric heating element) Category code (L is aluminum tube heating tube, P is sheet heater) Figure 1 Model representation method of aluminum tube and sheet heater 4.3.3 The model representation method of steel pipe heater is shown in Figure 2. Rated voltage (in volts) rated input power (in watts)

5 Technical requirements

5.1 Basic requirements 5.1.1 The components should be able to comply with the provisions of this standard and be manufactured in accordance with product drawings and technical documents. Note. Refer to Appendix B for the typical structure of components. 5.1.2 The components should work normally under the following conditions. a) The relative humidity of the surrounding air is not more than 90% (when the temperature is 25 ℃); b) There is no obvious shock and vibration. 5.1.3 The resistance materials used in the components should meet the requirements of GB/T 1234. 5.2 Information required by the manufacturer The component manufacturer shall provide sufficient information to ensure that the tests related to this standard can be carried out to confirm that the component meets the requirements of this standard. The data required for component testing of this standard includes but is not limited to the provisions of Table 1. 5.3 Safety requirements 5.3.1 Power deviation Under normal working conditions, the deviation of the input power of the component from the rated power should not be greater than the deviation shown in Table 2. 5.3.2 Leakage current 5.3.2.1 For steel pipe heaters used for defrosting, the leakage current at working temperature is not more than 0.75 mA. 5.3.2.2 For aluminum tubes and sheet heaters used for defrosting, the leakage current at working temperature shall not exceed 0.02 mA per meter. 5.3.3 Electric strength The insulation of the component should be able to withstand the corresponding electric strength test, and there should be no breakdown during the test. The test voltages corresponding to different rated voltages are shown in Table 3. 5.3.4 Insulation resistance 5.3.4.1 The cold insulation resistance value of the steel pipe heater used for defrosting shall not be less than 100 MΩ during the factory inspection; in the sealing test, overload energy The insulation resistance value after the force test and the life test should not be less than 5MΩ. 5.3.4.2 The cold insulation resistance value of aluminum tubes and sheet heaters used for defrosting shall not be less than 300MΩ during the factory inspection; The insulation resistance value after overload capacity test and life test should not be less than 10MΩ. 5.3.5 Overload capacity Under the specified conditions, the components should be able to withstand 30 cycles of overload test without damage. --For components whose rated input power does not exceed 100 W, the input power of the overload test is 1.33 times the rated value; --For components whose rated input power exceeds 100 W, the input power of the overload test is 1.27 times the rated value or 1.21 times plus 12 W, choose the larger of the two. 5.4 Hygiene requirements The shells or coatings of components designed to be in contact with food and eating utensils should meet the requirements of relevant national health standards. Unless the manufacturer declares this requirement, it is regarded as a component that is not in contact with food and eating utensils. 5.5 Requirements for hazardous substance limits The content of hazardous substances in the components used in electronic information products should comply with the National Administration of Restriction of Use of Hazardous Substances in Electrical and Electronic Products Measures" and GB/T 26572. Unless the manufacturer declares this requirement, it is deemed to be a component not used in electronic information products. 5.6 Performance requirements 5.6.1 Appearance 5.6.1.1 Steel pipe and aluminum pipe heaters shall not have significant mechanical scars or local expansion caused by abnormal processing and production. 5.6.1.2 There should be no wrinkles, bumps, cracks and cracks at the bend of the steel pipe and aluminum pipe heater. The diameter of the aluminum tube heater is greater than 5 The flatness rate of the bend is ≥70% for the aluminum tube; the flatness rate of the bend is ≥80% for the aluminum tube whose diameter is greater than 4 and less than or equal to 5. 5.6.1.3 The heating wires of the sheet heater should be neatly arranged and firmly bonded, and no virtual sticking phenomenon is allowed; the heat conductor should be flat, smooth, and colored There should be no damage and missing corners evenly. 5.6.1.4 The coating, electroplating layer, enamel layer, metal or non-metal spraying layer or aluminizing layer shall be uniform and firm, and there shall be no bubbles, peeling or localization. Department accumulation phenomenon. 5.6.2 General structure 5.6.2.1 Between the heating element of the steel tube heater and the lead wire (including the end), between the heating element of the aluminum tube heater (heating wire) and the lead wire (including the end) (Including the end) between the heating element (heating wire) of the chip heater and the lead wire should be sealed (if there is an agreement, the end can be temporarily sealed It is not sealed, and the sealing performance is not assessed); the minimum bending radius of the sheet heater is ≥5mm. 5.6.2.2 The length of the lead rod of the steel pipe heater in the pipe shall not be less than the value specified in Table 4. 5.6.2.3 The deviation of the outer diameter of the component should not exceed the value specified in Table 5. 5.6.2.4 The dimensional tolerances specified in this standard shall be evaluated according to the regulations, and the other dimensions with tolerance requirements shall be evaluated according to their requirements. Note the size of the tolerance is evaluated according to the V level of GB/T 1804-2000. 5.6.3 Working temperature NB/T 10307-2019 The temperature of the pipe body during normal operation of the component should not exceed the limit that has been proven that the material can be used safely. The steel pipe used for defrosting is added The effective heating surface temperature of the tube body during normal operation of the heater should not exceed 394℃; the effective heating surface of the tube body during normal operation of the aluminum tube heater The temperature should not exceed 130℃; the effective heating surface temperature of the sheet heater during normal operation should not exceed 80℃. 5.6.4 Device requirements 5.6.4.1 The lead-out device of the steel pipe heater shall be able to withstand a tensile force of 70% of its own tensile force, but not more than 1,000 N and a tensile force that lasts for 3 minutes In the test, no displacement and fracture occurred. Do not use explosive force during the test. 5.6.4.2 The steel pipe heater is welded with the lead-out device of the lug, the tensile force value of the lug should be.200 N, the direction is axial, and it lasts 3 times. In the tensile test of min, explosive force shall not be used during the test, and the welding piece shall not break or fall off during the test. 5.6.4.3 The aluminum tube, sheet heater heating element (heating wire) and the lead wire should be able to withstand a 36N tensile test for 60 s. After the test It should not break or fall off. 5.6.4.4 For components equipped with grounding blades, terminals and lead wires with connectors, the connectors shall comply with GB 17196-2017 connecting device connection Safety requirements for flat quick-connect terminals for copper wires. 5.6.4.5 The heating wire should be able to withstand a 36N tensile test that lasts for 60 s. After the test, its permanent growth rate shall not exceed 8%. 5.6.5 Working life The power-on time of the component under normal working conditions should reach the usage time declared by the manufacturer. It is judged by the test requirements of 6.11.1 and 6.11.2. 5.6.6 Flame resistance The non-metallic parts such as the sealing material in the component should have corresponding flame resistance. 5.6.7 Peel strength For chip components with hot melt adhesive, the bonding area between the heating wire and the aluminum foil should be able to withstand the adhesive peel strength test of 400 g. 5.6.8 Contact resistance The contact resistance of components with grounding devices must not be greater than 10 mΩ. 5.6.9 Corrosion resistance 5.6.9.1 After the salt spray test, the metal part of the steel pipe heater shall not have material corrosive pits that cannot be effectively removed (clean water and scouring pad) Abnormal spots and rust. 5.6.9.2 After the salt spray test, the aluminum tube and the sheet heater ar......
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