Some standard content:
Main content and scope of application
Machinery Industry Standard of the People's Republic of China
Safety requirements for centrifugal stove blowers
This standard specifies the safety requirements and test methods for centrifugal stove blowers. JB 5880-91
replaces JB2575-79
JB2576-79
This standard is applicable to single-phase and three-phase centrifugal AC hair dryers for household and similar purposes under general environmental conditions ( Hereinafter referred to as hair dryer). This standard does not apply to hair dryers used under other special conditions. 2 Reference standards
GB 4706.1
GB1002
GB2099
GB755
JB5881
GB 2423.3
3 Safety requirements| |tt||3.1 Startup
General safety requirements for household and similar electrical appliances Basic parameters and dimensions of single-phase plug and socket types Basic parameters and dimensions of single-phase and three-phase plugs and sockets Technical conditions
Basic technical requirements for motors||tt ||Centrifugal stove hair dryer
Basic environmental test method for electrical and electronic products Test Ca: Constant humidity and heat test method
3.1.1 At the rated frequency and the voltage value specified in Table 1, the hair dryer is in a ready-to-start state. The impeller should be able to start from any stationary state. Table 1
type
type
capacitor operation type
shielded pole type and others
three-phase power motor
80% of rated voltage
85% of rated voltage
80% of rated voltage
voltage
3.1.2 When the three-phase power supply is balanced , under the rated voltage, the difference between the current of any phase of the three-phase hair dryer and the average value of the three-phase current shall not be greater than 10% of the average value of the three-phase current.
3.2 Total input power
When the hair dryer is in the working state specified in Article 4.4 of this standard, the deviation of the total input power should comply with the following regulations. Table 2
Rated input power
W
33.3
>33.3～150
>150～300
>300||tt ||Approved by the Ministry of Mechanical and Electronic Industry 1991-1024
Partial
+10
+30%
+45W
+15%||tt| |Difference
Implemented in 1992-10-01
3.3 temperature rise
JB 5880-91
After the hair dryer passes the test in Article 4.5 of this standard, the temperature of each part Liters should not exceed the values ??specified in Table 3. Table 3
Measurement location
Motor winding
Motor core
Easily accessible outer surface
3.4 ??leakage current
Temperature rise value ( Class E)
75
60
20
The leakage current of the hair dryer in normal use shall not exceed the requirements in Table 4. Table 4
Test part
Between the live part and the shell
3.5 insulation resistance
Single
phase
0.75||tt ||Measurement method
Resistance method
Thermometer method or thermocouple method
Thermometer method or thermocouple method
Leakage current
mA||tt| |Three-phase
0.75
℃
The insulation resistance between the live part and the shell of the hair dryer in hot state, moisture state and after durability test should comply with the following regulations. 3.5.1 The insulation resistance value in the hot state shall not be less than 2MQ; 3.5.2 The insulation resistance value in the wet state shall not be less than 2M2. 3.6 Electrical strength
The insulation between the live part of the hair dryer and its shell shall be After 1 minute of electrical strength test, there is no flashover or breakdown phenomenon. The test voltage should be single-phase AC, 50Hz sinusoidal waveform, and the test voltage value is specified in Table 5. Table 5
Test voltage value in cold state
Test voltage value in wet state
3.7 Durability
1500
1250
V
3.7.1 After the hair dryer passes the durability test in Article 4.9 of this standard, its insulation resistance shall not be less than 2MQ, and its contacts and electrical connections shall not loosen due to heat and vibration.
3.7.2 The hair dryer shall not have bubbles or rust after passing the moisture-proof test in Article 4.7 of this standard. 3.8 Abnormal operation
The hair dryer shall meet the following requirements after undergoing the abnormal operation test in Article 4.10 of this standard. 3.8.1 The hair dryer shall not cause obvious deformation or mechanical damage. 3.8.2 The temperature of the hair dryer motor winding shall not exceed the requirements in Table 6. Table 6
Class A insulation
limit temperature
arithmetic mean
3.9 mechanical hazards and stability
175
150|| tt||3.9.1 The air inlet of the hair dryer should be equipped with a solid protective device, and an adjustable air inlet device can be installed when necessary. 2
Class E insulation
190
165
℃
JB 5880 -- 91
3.9.2 The fixing system of the hair dryer should Has sufficient mechanical strength. The rotating part must be well balanced, and the equivalent double amplitude value of the drum surface vibration should not be greater than 0.1mm.
3.10 Protection against electric shock
The structure of the hair dryer should be well protected and should be able to prevent the user from any accidental contact with its live parts during normal use. 3.11 Power cord
3.11.1 The power cord of the hair dryer should be a double insulated wire. The cross-sectional area and length of the wire should comply with the provisions of Table 7. Three-phase hair dryers are not connected to a power cord, but there must be a set of permanent connections to fix it. Line wiring device. Table 7
Hair dryer specifications
mm
30
45
60
75
Power
Rate
W
15
90
200
390
Wire cross-sectional area S
mma||tt| |0.5
0.5
1.5
1.5
The length of the exposed part of the power cord
mm
2500
2500|| tt | | 2500 | | tt | | 2500 | | tt | phenomenon occurs.
3.11.3 The plug of the power cord must be a plug that complies with the regulations of GB1002 and GB2099. 3.11.4 There should be an insulating protective sheath and clamping device at the outlet of the power supply. The power cord shall have a tensile force specified in Table 8. After 25 tensile tests, the power cord shall not be damaged, and the longitudinal displacement outside its outlet shall not be greater than 5 mm. Table 8
Weight of hair dryer
kg
4
>4
pull
60
100||tt ||Force
Force time of each tensile test
s
1
1
3.11.5 The clamping device of the power cord should be insulated Made of metal materials, if metal materials are used, they should be lined with insulation. 3.12 Ground connection
3.12.1 The resistance between the hair dryer with a ground wire, the ground electrode of the power cord plug (or the end of the ground wire) and the metal part connected to the ground wire shall not be greater than 0.22.
3.12.2 If the power cord does not have a grounding conductor, a special grounding device should be provided in the hair dryer and a grounding symbol should be marked, and the resistance between the grounding terminal and the metal parts it is connected to should not be greater than 0.1Q2 . 3.12.3 The grounding wire should be yellow and green, and this color wire should not be used for other purposes. 3.13 Capacitor
3.13.1 The capacitor of the hair dryer should have a reliable protective device. 3.13.2·During starting and operation, the terminal voltage of the capacitor should not exceed 1.1 times its working voltage. 3.14 Creepage distance and clearance
3.14.1 Creepage distance
The creepage distance of the hair dryer shall not be less than that specified in Table 9. Table 9
test
test
part
bit
between charged parts of different polarities
climb
Electricity
>3
mm
Distance
Between live parts and other metal parts
JB 5880 -- 91
Continued table 9 | | tt | Table 10
Test location
Between live parts of different polarities
Between live parts and accessible metals
4 Test methods
4.1 General requirements for the test
electricity
climb
air space
>3
>3
electricity
>2
>3
mm
distance
mm
4.1.1 In addition to leakage current, grounding performance and anti-electric shock protection tests, the requirements are at a temperature of 20 The test can be carried out in a test room with a temperature of ±5°C. All other tests can be carried out in a room where the temperature is not higher than ±40°C and there is no external air flow or heat radiation. 4.1.2 The fluctuation of test voltage and frequency shall not exceed ±1% of the rated value. 4.2 Test instruments
4.2.1 The accuracy of ammeters, voltmeters, power meters, and frequency meters used for type testing should not be lower than level 0.5, and the accuracy of factory testing should not be lower than level 1.0 (leakage current Measuring instruments are not limited to this). 4.2.2 The instrument used to measure insulation resistance is a 500V megohmmeter with an accuracy of not less than level 1.0. 4.2.3 The instrument for measuring rotational speed should be non-contact and its accuracy is 1r/min. 4.2.4 The accuracy of the measuring tools used to measure creepage distance and electrical clearance should be within 0.02mm. 4.2.5 The instrument for measuring temperature has an accuracy of 0.5°C. 4.2.6 Stopwatch for measuring time, its accuracy is 0.1s. 4.2.7 The accuracy of instruments measuring atmospheric pressure and humidity is 0.5%. 4.3 Start-up test
Under the conditions specified in Article 3.1 of this standard, apply the test voltage intermittently with the voltage value specified in Table 1, and start three times. Each time the impeller starts in any static state, the hair dryer should Can be started to run. As long as it cannot be started once, it is considered a failure. 4.4 Measurement of input power
The hair dryer is operated under rated voltage, rated frequency and normal working conditions for at least 30 minutes before measuring the input power of the hair dryer. The result shall comply with the provisions of Article 3.2 of this standard.
4.5 Temperature rise test
4.5.1 Determine the fixed ambient temperature during the temperature rise test. Place several (not less than 2) thermometers 1.5m away from the hair dryer under test and take their readings. The average value is its surrounding ambient temperature. 4.5.2 The motor and all electrical components of the hair dryer are in working condition at the rated voltage and 1.06 times the rated frequency. After the hair dryer reaches thermal stability, the test is carried out according to the following procedures. 4.5.2.1 Use a thermometer or thermocouple to measure the surface temperature rise of the fan. The measurement location should be the hottest outer surface that is easily accessible. 4.5.2.2 Use the resistance method to measure the temperature rise of the motor winding. You can also use a single-arm bridge or other measuring instruments with corresponding accuracy. The measurement of the hot resistance must be completed within 20 seconds after cutting off the power supply. The cold and hot resistances should be measured using the same power supply. Bridge measurement. 4.5.2.3 The temperature rise of the copper wire winding is calculated from equation (1): At- RRR(235 +t) - (t. - t)C
Ri
4
(1)
Where: R, - the cold resistance of the winding at t, α; JB 5880-91
R2 - the hot resistance of the winding at t2 at the end of the test, Q , t room temperature at the beginning of the test, ℃,
te
room temperature at the end of the test, ℃,
After the temperature rise test, the temperature rise value of each part of the hair dryer under test should comply with The provisions of Article 3.3. 4.6 Leakage current measurement
4.6.1 Leakage current measurement shall be carried out immediately after the temperature rise test in Article 4.5 of this standard under the environmental conditions of 20±5℃, and the hair dryer under test shall be operated at 1.1 times the rated voltage. Run the single-phase hair dryer at the bottom, and measure the leakage current between the live part of the hair dryer and the casing according to Figure 1 (for three-phase hair dryers, see Figure 2). The circuit for measuring the leakage current can also use a fixed-value resistor in the test circuit. Use an AC voltmeter with a low range and high internal resistance to measure the voltage drop across the fixed value resistor, and then calculate the leakage current using Ohm's law. Accessible parts
Inaccessible metal parts
Basic insulation
Supplementary insulation
Reinforced insulation
Picture
→Double insulation|| tt||JB 5880-91
Figure 2
Accessible parts
Inaccessible metal parts
Basic insulation,
Supplementary insulation|| tt | 3. The provisions of Article 4. 4.6.3 When measuring the leakage current of a three-phase hair dryer, switches a, b, and c should be turned off in turn to measure the maximum leakage current value, and should comply with the provisions of Article 3.4 of this standard.
4.7 Insulation resistance measurement
4.7.1 Thermal insulation resistance
After the leakage current measurement in Article 4.6 of this standard, use a megohmmeter to measure the live part of the hair dryer and its shell The insulation resistance between them shall comply with the provisions of Article 3.5 of this standard. 4.7.2 Tide insulation resistance
The hair dryer under test shall be subjected to a constant humidity and heat test for two days in the test box (room) according to the procedures and test conditions specified in GB2423.3. Within 1 hour before the end of the test, the hair dryer shall be The insulation resistance between the live part of the sample and the casing is measured in the box (room) and shall comply with the provisions of Article 3.3 of this standard.
4.8 Electrical strength test
4.8.1 The electrical strength test in cold state is carried out at room temperature after the hot state resistance measurement in Article 4.7.1 of this standard. 4.8.2 The electrical strength test in the wet state is carried out in the test box (room) after measuring the insulation resistance in the wet state in Article 4.7.2 of this standard. 4.8.3 At the beginning of the electrical strength test, the applied voltage is no more than half of the test voltage, and then quickly increases to the maximum value. The test voltage value of the electrical strength test, the pressurization duration and the tested part of the sample shall comply with the provisions of Article 3.6. The factory test is allowed to use a voltage 1.25 times the test voltage value specified in Article 3.6 and an electrical strength test lasting 1 second. 4.8.4 The capacity of the test transformer shall not be less than 750VA. 4.9 Durability test
The hair dryer under test was operated at 1.1 times the rated voltage and normal load for 48 hours, and then operated at 0.9 times the rated voltage and normal load for 4.9.11
48 hours.
The above two tests can be conducted continuously or cumulatively in stages, but the duration of each operation shall not be less than 8 hours. 4.9.2 The hair dryer under test is started 50 times each under normal load, 1.1 times rated voltage and 0.85 times rated voltage. Each time the hair dryer is turned on is at least 6
JB 5880-91
from start to 10 times the full speed time, but not less than 10s, and the interval between each start is not less than 3 times the turn-on time. After testing, the hair dryer under test shall comply with the provisions of Article 3.7 of this standard. 4.10 Abnormal working test
The hair dryer is subjected to abnormal working test at full speed. The test starts from the cold state and is carried out in the following order at rated voltage. 4.10.1 Use variable frequency power supply or mechanical speed regulation method to make the impeller of the hair dryer reach 1.2 times the rated speed for 2 minutes. 4.10.2 Lock the hair dryer motor
4.10.3 Short-circuit the capacitor of the secondary winding of the hair dryer motor. Each fault is tested once, and the test duration is the time required for the hair dryer motor to reach its thermal stable state. If the hair dryer has an overload protection device, its continuous power-on time is until the moment when the protection device disconnects the power supply. After testing, the sample meets the requirements of Article 3.8 of this standard.
4.11 Anti-electric shock protection test
According to the circuit shown in Figure 3 and the standard test finger shown in Figure 4, the anti-electric shock protection test is carried out on the tested hair dryer under the environmental condition of 20±5℃, that is, the two ends of the power supply of the tested hair dryer are electrically connected; then the indicator light E is connected in series to one pole of the test power supply, and the standard test finger is connected to the other pole of the test power supply, and then the contact position of the standard test finger on the sample is continuously changed so that it touches the part of the sample that it may reach. If there is no light signal from the indicator light, the hair dryer meets the provisions of Article 3.10 of this standard. The voltage of the test power supply shall not be less than AC 40V.
4.12 Tensile test of power cord clamping device
During the test, let the power cord of the hair dryer droop naturally, and fix the hair dryer (or perform the test on a special power cord tensile tester). Apply the tensile force specified in Table 8 of Article 3.11.4 of this standard to the power cord, but do not use impact force. After the first application of tensile force, draw a starting mark next to the hair dryer housing (power cord outlet). After applying tensile force 25 times, measure the longitudinal pull-out length of the power cord and check the integrity of the power cord. All of these should comply with the provisions of Article 3.11.4 of this standard. 4.13 Grounding resistance measurement
The grounding resistance measurement of the hair dryer should be carried out in a room at 20±5℃. 4.13.1 Grounding resistance measurement of the hair dryer with grounding wire According to the circuit in Figure 5, measure the resistance between the prototype housing and the grounding electrode of the power cord plug. At this moment, the no-load output voltage of the step-down transformer does not exceed 6V. Adjust the auto-coupling voltage regulator or variable resistor to keep the loop current at 10A. Use an AC voltmeter to measure the voltage drop between the housing and the grounding electrode of its plug.
4.13.2 Determination of grounding resistance of hair dryer without grounding wire According to the circuit of Figure 5, measure the resistance between the housing of the prototype and its dedicated grounding device. At this moment, the no-load output voltage of the step-down transformer does not exceed 12V. Adjust the auto-coupling voltage regulator or variable resistor to keep the loop current at 25A. Use an AC voltmeter to measure the voltage drop between its housing and its dedicated grounding device.
Based on the above measured data, calculate the resistance value using the current and voltage drop method, and it should comply with the provisions of Articles 3.12.1 and 3.12.2 of this standard respectively.
S
S2
Figure 3
Z Indicator light
S.——Tested hair dryer,
U -220V power supply
S,—standard test finger,
7
357
V—AC voltmeter,
K-
a single-pole double-throw switch,
4.14 Determination of capacitor terminal voltage
508
Baffle
~TY
JB 5880--91
180
90
Insulating material
Q
Detailed drawing
4
Figure
Standard test
JB
Figure 5
A——AC ammeter,
R
Variable resistor,
Dt
Condenser
60
TY-Auto-regulator
S—— Tested hair dryer
Spot A
Part 1
Part 2
Rear view
BB
abZxz.net
Cylindrical
Section C—
Spherical
JB-
Step-down transformer,
Measurement of the capacitor terminal voltage of the hair dryer motor should make the hair dryer run at 1.1 times the rated voltage and minimum load. Use a voltmeter to measure the voltage value across the capacitor in the secondary winding loop, and it should comply with the provisions of Article 3.13.2 of this standard. 4.15 Mechanical hazard and stability detection
4.15.1 Check the reliability of the mechanical strength of the fan fixing system. 4.15.2 The hair dryer runs at full speed at rated voltage and rated frequency, and the equivalent double amplitude value of the wind drum surface vibration is detected by a vibration instrument, and it should comply with the provisions of Article 3.9.2 of this standard.
4.16 General inspection
General inspection of hair dryers is to check whether the grounding wire color, grounding symbol, power cord and plug, creepage distance, electrical clearance, protective devices, etc. comply with the relevant provisions of this standard. The inspection is carried out by the inspector visually and using the corresponding measuring tools. 8
Additional instructions:
JB5880-91
This standard is proposed and managed by the Guangzhou Daily Electrical Appliances Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Guangzhou Daily Electrical Appliances Research Institute and Tianjin Jiaodian Commodity Inspection Station. The drafters of this standard are Deng Jianwei, Sun Bibo and Dai Kaiyu. 9
16 General inspection
The general inspection of the hair dryer is to check whether the color of the ground wire, ground symbol, power cord and plug, creepage distance, electrical clearance, protective device, etc. comply with the relevant regulations of this standard. Inspections are carried out by visual inspection by inspectors and the use of corresponding measuring tools. 8
Additional notes:
JB5880-91
This standard is proposed and managed by the Guangzhou Daily Electrical Appliances Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Guangzhou Daily Electrical Appliances Research Institute and Tianjin Jiaodian Commodity Inspection Station. The drafters of this standard are Deng Jianwei, Sun Bibo and Dai Kaiyu. 9
16 General inspection
The general inspection of the hair dryer is to check whether the color of the ground wire, ground symbol, power cord and plug, creepage distance, electrical clearance, protective device, etc. comply with the relevant regulations of this standard. Inspections are carried out by visual inspection by inspectors and the use of corresponding measuring tools. 8
Additional notes:
JB5880-91
This standard is proposed and managed by the Guangzhou Daily Electrical Appliances Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Guangzhou Daily Electrical Appliances Research Institute and Tianjin Jiaodian Commodity Inspection Station. The drafters of this standard are Deng Jianwei, Sun Bibo and Dai Kaiyu. 9
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