JB/T 10212-2000 Direct-acting electronic expansion valve for refrigeration and air conditioning
Some standard content:
ICS27.200
Machinery Industry Standard of the People's Republic of China
JB/T10212-2000
Direct-driven electronic expansion valves for refrigerating and air-conditioning equipment
Direct-driven electronic expansion valves for refrigerating and air-conditioning equipment2000-08-31 Issued
National Bureau of Machinery Industry
2001-01-01 Implementation
JB/T10212—2000
The main technical indicators specified in this standard are formulated with reference to JB/T41191991 "Solenoid valve for refrigeration", JB/T35481991 "R12, R22, R502 thermal expansion valve for refrigeration" and the technical requirements proposed by domestic air conditioner manufacturers. Appendix A of this standard is a prompt appendix.
This standard is proposed and managed by the National Technical Committee for Standardization of Refrigerating Equipment. The drafting unit of this standard: Shanghai Junle Refrigeration Automatic Control Components Co., Ltd. The drafters of this standard: Xu Xing, Wen Jun.
1 Scope
Mechanical Industry Standard of the People's Republic of China
Direct-driven electronic expansion valves for refrigerating and air-conditioning equipment
Direct-driven electronic expansion valves for refrigerating and air-conditioning equipment JB/T10212—2000
This standard specifies the definition, type and basic parameters, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of direct-driven electronic expansion valves for refrigerating and air-conditioning equipment. This standard applies to direct-driven electronic expansion valves for refrigerating and air-conditioning equipment (hereinafter referred to as expansion valves) with R22 as refrigerant (R407C can be used as a reference) and a valve diameter not greater than 5mm. The expansion valve is suitable for variable frequency air conditioners, variable frequency refrigerators, etc. as throttling and pressure reduction devices. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB191-1990
GB/T 2423.1—1989
GB/T2423.2—1989
GB/T2423.3—1993
GB/T2423.101995
GB/T133061991
3 Definitions
This standard adopts the following definitions.
3.1 Electronic expansion valve
Packaging, storage and transportation pictorial marking
Basic environmental test procedures for electrical and electronic products Test A: Low temperature test method Basic environmental test procedures for electrical and electronic products Test B: High temperature test method Basic environmental test procedures for electrical and electronic products Test Ca: Steady damp heat test method Environmental testing for electrical and electronic products Part 2: Test methods Test Fc and guidelines: Vibration (sinusoidal) label
A control element that can adjust the flow of refrigerant entering the refrigeration device according to a preset program. It is called an electronic expansion valve because of its electronic adjustment and expansion valve function. It includes electric electronic expansion valves and electromagnetic electronic expansion valves. 3.2 Direct-acting electronic expansion valve
The valve needle is directly driven by the motor rotor to change the flow of the expansion valve by using the rotation of the stepper motor. 3.3
Maximum working pressure
The maximum working pressure allowed when the expansion valve is in normal use. 3.4
Maximum opening pressure difference
The maximum pressure difference between the inlet and outlet of the expansion valve when the expansion valve is reliably opened. 3.5 Leakage
The flow rate of the test medium through the expansion valve when it is closed under the specified test conditions. 3.6 Nominal capacity
The product of the mass flow rate of the refrigerant flowing through the expansion valve and the difference between the liquid melting value at the inlet of the expansion valve and the saturated vapor melting value at the evaporation temperature under the nominal working conditions and 65% full-open pulse number opening. Approved by the State Bureau of Machinery Industry on August 31, 2000 and implemented on January 1, 2001
Pressure drop
JB/T10212—2000
The pressure difference between the inlet pressure and the outlet pressure of the expansion valve 3.8
Flow characteristics
The relationship between the flow rate flowing through the expansion valve and the number of pulses of the input stepper motor coil pulse current. 3.9
Full-open pulse number
The number of pulses of the pulse current of the stepper motor coil required for the expansion valve to go from closed to fully open is called the full-open pulse number. Type and basic parameters
According to the driving mode, the electric electronic expansion valve can be divided into two types: direct-acting electronic expansion valve and deceleration electronic expansion valve. Nominal working conditions of expansion valve
The nominal working conditions of the expansion valve used in the refrigeration system are as follows: a) Refrigerant name: R22:
b) Condensing temperature: 40℃:
c) Liquid refrigerant temperature entering the expansion valve: 38℃d) Evaporation temperature: 5℃.
5 Technical requirements
1 General provisions
The expansion valve shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 5.2 Working conditions
5.2.1 The applicable medium temperature range of the expansion valve is -30~+90℃. 5.2.2 The maximum working pressure of the expansion valve is 2.95MPa5.3 Flow characteristics
The manufacturer shall provide the flow characteristic curve.
5.4 Working medium flow direction
Reversible.
5.5 Rated voltage
DC 12V, 24V, 36V.
5.6 Pulse frequency
30-90Hz.
5.7 Leakage
Under the specified test method, the leakage of the expansion valve shall be less than that specified in Table 1. Table 1 Leakage amount
Leakage amount (nitrogen)
NmL/min
3 Maximum valve opening pressure difference
JB/T10212-2000
Under the specified test method, the maximum pressure difference for normal opening of the expansion valve shall not be less than 2.26MPa in the forward direction and not less than 1.47MPa in the reverse directiona Voltage change
The expansion valve shall be able to work normally when the rated voltage fluctuates within the range of 85%~115% 5.10 Air tightness
The expansion valve shall have no leakage under the action of a gas (dry nitrogen) pressure of 1.1 times the maximum working pressure 1 Insulation resistance
When the ambient temperature of the expansion valve is 5~43℃ and the relative humidity does not exceed 85%, the insulation resistance between the coil terminal and the casing shall not be less than 100M2. After the constant humidity test, the insulation resistance should be no less than 2M22 Electrical strength
When the expansion valve is at an ambient temperature of 5~43℃ and the relative humidity does not exceed 85%, the coil and the shell should be able to withstand an electrical strength test of a basic sinusoidal voltage of 500V and a frequency of 50Hz. There should be no insulation breakdown or surface flashover for 1 minute. 5.13 Capacity
5.13.1 Under nominal working conditions,
65% full-open pulse number opening, the measured actual capacity shall not be less than 95% of the nominal capacity5.13.2 Flow (nitrogen) factory inspection According to the flow (nitrogen) factory inspection method specified in 6.8.2, the nitrogen flow at 65% full-open pulse number shall comply with the specified values in Table 2
Table 2 Flow
Note: For other specifications, please refer to
65% full-open pulse number flow
NL/min
5.14 Strength test
JB/T10212-2000
The expansion valve shall be able to withstand a strength test of 1.5 times the maximum working pressure for 3 minutes. There shall be no external leakage or abnormal deformation during the test. 5.15 Allowable coil temperature
Under the specified test method, the temperature of the stator coil of the expansion valve shall not exceed the specified value in Table 3 Table 3 Coil temperature
Insulation level
Coil temperature
5.16 Low temperature resistance
The expansion valve shall be able to withstand the low temperature test. Severe level: low temperature -30℃, duration 96h. After the test, it shall still meet the requirements of 5.7, 5.8, 5.10, 5.11, and 5.12.
5.17 High temperature resistance
The expansion valve shall be able to withstand the high temperature test. Severe level: high temperature +100℃, duration 96h. After the test, it shall still meet the requirements of 5.7, 5.85.10, 5.11, and 5.12.
5.18 Steady damp heat
The expansion valve shall be able to withstand the steady damp heat test. Severity level: high temperature +40℃, relative humidity 95%, test period 96h. After the test, it should meet the requirements of 5.7, 5.8, 5.10, 5.11 and 5.12. 5.19 Vibration resistance
The expansion valve shall be able to withstand a fixed frequency vibration test with a frequency of 33H and an acceleration of 4.4g. After the test, the expansion valve shall be able to operate normally, the parts shall not be loose, and shall meet the requirements of 5.7.
5.20 Life
Under the specified test method, the expansion valve shall be able to withstand 100,000 opening and closing cycle tests. After the test, the expansion valve shall be able to operate normally, and its leakage shall not exceed twice the value specified in Table 1. 6 Test method
6.1 General requirements for measuring instruments
6.1.1 Measuring instruments and equipment shall be within the effective use period and be accompanied by a calibration certificate. 6.1.2 The accuracy of the temperature measuring instrument shall be ±0.3℃. 6.1.3 The accuracy level of the pressure measuring instrument shall not be lower than level 0.5, and the pressure gauge graduation value shall not be greater than twice the specified accuracy. The accuracy of the instrument used to measure flow shall not be lower than level 1.0, and the leakage measuring instrument shall not be lower than level 1.0. 6.1.4
6.1.5Electrical measuring instruments, the error is ±1% of the indicated value6.2The overall dimensions and appearance quality shall conform to the product drawings approved according to the prescribed procedures, and shall be inspected with general measuring tools and special measuring tools.6.3Leakage
Install the expansion valve on the test bench shown in Figure 1, so that the positive flow of the expansion valve is the same as the flow direction of the working fluid in the test system. First, open and close the expansion valve 5 times, and then input nitrogen with a pressure of 1MPa from the inlet end when the expansion valve is fully closed, and measure the leakage of nitrogen with a flow meter.4
JB/T10212—2000
1Nitrogen cylinder: 2-Pressure regulating valve: 3-Manual valve: 4-Container: 5-Pressure gauge: 6-Expansion valve controller: 7Expansion valve: 8-Flow measuring instrumentFigure 1 Schematic diagram of leakage test bench
6.4Maximum valve opening pressure difference test
Install the expansion valve on the test bench shown in Figure 2 in the fully closed state. 7
When conducting the forward maximum valve opening pressure difference test, make the forward flow direction of the expansion valve the same as the working fluid flow direction of the test system, reduce the voltage of the driving power supply to 85% of the rated voltage, slowly increase the pressure at the inlet of the regulating valve to 2.26MPa, turn on the driving power supply, the expansion valve should be able to open and work normally.
When conducting the reverse maximum valve opening pressure difference test, make the forward flow direction of the expansion valve opposite to the working fluid flow direction of the test system, reduce the voltage of the driving power supply to 85% of the rated voltage, slowly increase the pressure at the inlet of the regulating valve to 1.47MPa, turn on the driving power supply, the expansion valve should be able to open and work normally.
1 Nitrogen cylinder: 2- Pressure regulating valve: 3- Manual valve: 4- Container; 5- Pressure gauge: 6- Expansion valve controller: 7 Expansion valve to be tested: 8- Flow measuring instrument Figure 2 Schematic diagram of the maximum valve opening pressure difference test bench
6.5 Air tightness test
Make the expansion valve fully open, remove the stator coil, block the outlet, slowly input 1.1 times the maximum working pressure of nitrogen at the inlet, and then immerse the valve body in the water tank for 1 minute to check that there should be no bubbles overflowing from the valve body surface and each connection. 5
6.6 Insulation resistance test
JB/T10212-2000
When the ambient temperature of the expansion valve is 5~43℃ and the relative humidity does not exceed 85%, use a megohmmeter with a rated voltage of 500V to measure the insulation resistance between its non-charged and charged parts. 6.7 Electrical strength test
The electrical strength of the insulation of the expansion valve shall be measured on a high-voltage test device with an output power of not less than 0.25 kVA and a power supply frequency of 50 Hz. The voltage shall be slowly raised to the specified test voltage value and maintained for 1 min. There shall be no breakdown or flashover. Then the voltage shall be slowly reduced to zero and the power shall be cut off. The leakage current setting value is 1 mA. In large-scale continuous production, a test with a voltage of 600 V and a duration of 1 s may be used instead. 6.8 Capacity test
6.8.1 Nominal capacity test
6.8.1.1 Refrigerant flow test through the expansion valve In the expansion valve flow test device, the oil content in the refrigerant shall not exceed 5% by mass, and the oil content shall be measured by weighing. Install the expansion valve on the refrigerant flow test device shown in Figure 3, turn on the drive power supply, and gradually increase the expansion valve from closed to fully open, increasing 10 pulses each time, and then adjust according to the parameters specified in the nominal working condition. After the working condition is stable, record the corresponding refrigerant flow. And draw the relationship curve between refrigerant flow rate and pulse number. The test should be carried out in both forward and reverse directions, and the capacity should meet the requirements of 5.13.1. 1. Pressure gauge: 2. Temperature gauge: 3. Manual valve: 4. Sight glass: 5. Flow measuring instrument: 6. Expansion valve to be tested: 7. Expansion valve controller: 8. Pressure regulating valve. Figure 3. Refrigerant flow test device. 6.8.1.2 Nominal capacity calculation. The refrigerant flow rate corresponding to the 65% full-open pulse number is the nominal flow rate of the expansion valve. Calculate according to formula (1): O = G (hz-h,) In the formula: 9
- Nominal cooling capacity of the expansion valve, kW:
- Nominal flow rate of the expansion valve, kgs:
- Liquid specific value of the refrigerant entering the expansion valve, kJ/kg; Saturated gas specific value of the refrigerant leaving the evaporator, kJ/kg. (1)
6.8.2 Flow rate (nitrogen) factory test
JB/T10212—2000
Install the expansion valve on the test bench shown in Figure 4, so that the outlet of the expansion valve is connected to the atmosphere. Adjust the pressure at the inlet to 0.1MPa (gauge pressure). When the expansion valve controller sends out 65% of the full-open pulse number, measure the flow value of the expansion valve and calculate whether the nitrogen flow rate under the standard state meets the requirements of 5.13.2. Tests should be carried out in both forward and reverse directions, and the flow rates should meet the requirements. 1
1-gas cylinder: 2-pressure regulating valve: 3-manual valve: 4-container: 5-pressure regulating valve 6-pressure gauge: 7-mass flow measuring instrument: 8-expansion valve controller: 9-tested expansion valve Figure 4 Schematic diagram of flow (nitrogen) test bench
6.9 Strength test
Connect the liquid source to the expansion valve, and evenly and slowly increase the pressure to 1.5 times the maximum working pressure. There should be no leakage and abnormal deformation when the pressure is maintained for 3 minutes.
6.10 Coil temperature rise
The stable temperature rise of the expansion valve stator coil is measured by the resistance method. a) Place the expansion valve vertically in an unventilated normal temperature environment. The ambient temperature change should be between ±2℃. Record the room temperature and the coil cold resistance value:
b) Turn on the drive power supply, keep the voltage at 115% of the rated voltage, and the power supply output is continuously carried out at 60 pulses per second until the temperature rise tends to be stable (that is, when the temperature change does not exceed 1K within 1h). Disconnect the power supply, quickly measure the hot resistance value of the coil, and record the ambient temperature at this time;
c) Calculate the coil temperature according to formula (2):
Where: T
-coil temperature rise, K:
cold resistance, Q;
hot resistance, Q;
cold ambient temperature, ℃:
hot ambient temperature, ℃;
+t)+(tt)
The resistance temperature coefficient of the conductor material at 0℃ is 1/234.5 for copper wire. (2)
6.11 Low temperature resistance test
JB/T10212-2000
The low temperature resistance test of the expansion valve shall be carried out according to the method specified in "Test Aa: Low temperature test of non-heat dissipation test sample with sudden temperature change" in GB/T2423.1. The temperature shall be maintained at -30℃±3℃ for 96h. After the test, the test is resumed for 2 hours under normal atmospheric conditions. After the recovery phase is over, the test is immediately carried out according to the methods 6.3, 6.4, 6.6, 6.7, and 6.8.1. 6.12 High temperature resistance test
The high temperature resistance test of the expansion valve is carried out according to the method specified in "Test Ba: High temperature test of non-heat dissipation test sample with sudden temperature change" in GB/T2423.2. The temperature should be maintained at 100℃±2℃ for 96h. After the test, the test is resumed for 2 hours under normal atmospheric conditions. After the recovery phase is over, the test is immediately carried out according to the methods 6.3, 6.4, 6.6, 6.7, and 6.8.1. 6.13 Constant humidity test
The constant humidity test of the expansion valve is carried out according to the method specified in "Test Ca: Constant humidity test" in GB/T2423.3. The temperature should be maintained at 40℃±2℃ and the relative humidity should be maintained at (93)%. The test period is 96h. After the test, restore under normal atmospheric conditions for 1 hour. Immediately after the recovery phase, test according to methods 6.3, 6.4, 6.6, 6.7, and 6.8.1. 6.14 Vibration resistance test
Install the expansion valve on the vibration test bench according to the working position and perform the test according to the method specified in "Part 2 Test Method Fc and Guidelines" in GB/T2423.10. Press 5.18 The fixed frequency vibration test is carried out in the three directions of up and down, left and right, and front and back at the frequency and acceleration specified in 18, of which the up and down direction is 4h, and the front and back, left and right directions are 2h each. After the test, check whether the parts are loose, and inspect them according to method 64. 6.15 Life test
Perform according to the actual use conditions or install the expansion valve in the working position (vertical) on the device shown in Figure 5, use nitrogen as the test medium, the inlet pressure is 1MPa, and the outlet is open to the atmosphere. At room temperature, use the driving power supply to send a driving pulse signal to make the expansion valve from fully closed to fully open and then fully closed, a total of 100,000 times, of which the leakage is measured according to method 6.3 every 20,000 times to check whether it meets the requirements of 5.20.
1-Nitrogen cylinder: 2-Regulating valve: 3-Manual valve: 4-Gas storage tank: 5-Pressure gauge: 6-Counter: 7-Pressure sensor: 8-Expansion valve controller: 9-Tested expansion valve Figure 5 Life test device
7 Inspection rules
Expansion valve factory inspection, sampling inspection and type test items shall be in accordance with the provisions of Table 4. 8
Leakage
Maximum valve opening pressure difference
Air tightness
Insulation resistance
Electrical strengthbZxz.net
Strength test
Allowable temperature rise of coil
Low temperature resistance
High temperature resistance
Steady damp heat
Vibration resistance
Durability
Expansion inspection
Note: △ symbol indicates items to be done.
7.1 Factory inspection
Each product shall be subject to factory inspection.
2 Sampling inspection
JB/T10212—2000
Table 4 Inspection items,
Inspection methods and requirements
Sampling inspection
Type test
Technical requirements clause
7.2.1 Products produced in batches shall be subject to sampling inspection to check the stability of the production process. Test method clause
The number of products of the same model within a year shall be regarded as an inspection batch and the sampling time shall be evenly distributed throughout the year. 7.2.2
The sampling inspection plan shall be in accordance with the provisions of Table 5.
Batch number
>50~100
>100-500
7.3 Type test
Sample size
Type test shall be carried out for expansion valves in the following cases: a) New trial expansion valves or when production starts at a new factory: Sampling test plan
Qualified judgment number Ac
b) When there are major changes in product design, process or materials that may affect product performance: c) Once every three years during normal production: d) When production is resumed after suspension for more than one year.
Type test records can be provided according to the requirements of the ordering party. Unqualified judgment number Re
8 Marking, packaging, transportation and storage
8.1 Marking
JB/T10212—2000
A label should be fixed on a prominent part of the expansion valve, and its size should comply with the provisions of GB/T13306, and the following contents should be marked: a) Manufacturer name:
b) Product model and name:
c) Refrigerant and nominal capacity:
d) Maximum working pressure;
e) Rated voltage:
f) Year and month of manufacture.
8.2 Packaging
8.2.1 The packaging method of the expansion valve should ensure that the product will not be damaged during normal transportation. When the product leaves the factory, the inlet and outlet should be protected from dust, and should be: clean, moisture-proof, mildew-proof and sealed. 8.2.2 Packaging mark
The exterior of the packaging box should indicate: product model, name, quantity, recipient and address, shipping unit and address, and correctly select the packaging storage and transportation graphic mark according to GB191.
8.3 Technical documents that should be brought with the product when it leaves the factory
8.3.1 Product certificate
Its contents are:
a) Product model and name:
b) Inspection conclusion:
c) Signature and official seal of the inspector;
d) Inspection date.
8.3.2 Product manual
Its contents are:
a) Main technical parameters, working principle, performance characteristics, and usage methods: b) Connection size:
c) Installation instructions.
8.3.3 Packing list
8.4 Transportation
8.4.1 During transportation, the products should be protected from severe vibration, extrusion, rain and chemical corrosion. 8.4.2 During loading and unloading, they must be handled with care. Rolling, collision and throwing are strictly prohibited. 8.5 Storage
The finished products should be stored in a ventilated and dry warehouse, and there should be no corrosive media in the warehouse. 102 Product manual
The contents are as follows:
a) Main technical parameters, working principle, performance characteristics, and usage methods: b) Connection dimensions:
c) Installation instructions.
8.3.3 Packing list.
8.4 Transportation
8.4.1 During transportation, the product should be protected from severe vibration, extrusion, rain and chemical corrosion. 8.4.2 Loading and unloading must be done with care. Rolling, collision and throwing are strictly prohibited. 8.5 Storage
The finished product should be stored in a ventilated and dry warehouse, and there should be no corrosive media in the warehouse. 102 Product manual
The contents are as follows:
a) Main technical parameters, working principle, performance characteristics, and usage methods: b) Connection dimensions:
c) Installation instructions.
8.3.3 Packing list.
8.4 Transportation
8.4.1 During transportation, the product should be protected from severe vibration, extrusion, rain and chemical corrosion. 8.4.2 Loading and unloading must be done with care. Rolling, collision and throwing are strictly prohibited. 8.5 Storage
The finished product should be stored in a ventilated and dry warehouse, and there should be no corrosive media in the warehouse. 10
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.