JB/T 7961-1995 Pressure and differential pressure controllers for refrigeration
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Pressure and differential pressure controller for refrigeration
Subject content and scope of application
JB/T 7961-95
Replaces ZBJ73042--89
This standard specifies the basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of pressure and differential pressure controllers for refrigeration.
This standard applies to pressure and differential pressure controllers using ammonia and Freon as refrigerants, including high-pressure controllers, low-pressure controllers, high and low-pressure controllers, and differential pressure controllers (hereinafter collectively referred to as controllers). 2 Reference standards
GB1239.1 Technical conditions for cold-rolled cylindrical helical tension springsGB1239.2 Technical conditions for cold-rolled cylindrical helical compression springsGB1239.3 Technical conditions for cold-rolled cylindrical helical torsion springsGB 1239.5
GB 2423.1
Sampling inspection of cylindrical helical springs
Basic environmental testing procedures for electrical and electronic productsTest A: Low temperature test methodBasic environmental testing procedures for electrical and electronic productsTest B: High temperature test methodGB 2423.2
GB 2423.3
Basic environmental test procedures for electric and electronic productsTest Ca: Steady-state damp heat test method
GB/T13306 Product label
JB3022
Micro switch
JB/T6169
Metal bellows
3 Basic parameters of the controller
The basic parameters of the controller shall comply with the provisions of Table 1. 3.1
High pressure controller
Low pressure controller
High and low pressure controller
High pressure end
Low pressure end
Oil pressure difference controller
Adjustment range
0. 5~3. 0
0. 08- 0. 6
- 0. 08 ~ 0. 6
0.05~0. 35
High pressure end ≤0.6
Low pressure end ≥0.16
0.08~0.4 adjustable
High pressure end ≤0.6
Low pressure end ≥0.16
0.08~0.4 adjustable
3.2The rated voltage and rated current of the controller microswitch shall comply with the provisions of Table 2. Approved by the Ministry of Machinery Industry of the People's Republic of China on June 16, 1995 1490
Reset form
Delay time, s
30~180
Implemented on July 1, 1996
Rated AC voltage, V
Rated current, A
3.3 Model representation method
JB/T 7961-95
3.3.1 The model numbers of high-pressure controller, low-pressure controller and oil pressure differential controller are indicated as follows: 380
Reset form: S indicates manual reset, not indicated for oil pressure differential controller, not indicated for automatic reset Working medium: F indicates special for Freon, not indicated for ammonia and Freon Maximum value of controller setting range: indicated in Arabic numerals, MPa Category: YK indicates pressure controller, CK indicates oil pressure differential controller Model example:
High-pressure controller, the maximum value of the setting range is 3MPa, special for Freon, model is YK3F; oil pressure differential controller, the maximum value of the setting range is 0.35MPa, special for Freon, model is CK0.35F. 3.3.2 The model of high and low pressure controller is as follows: YK
Reset form: S indicates manual reset, automatic reset does not indicate working medium: F indicates special for Freon, ammonia and Freon are common. The maximum value of the low pressure end setting range: expressed in Arabic numerals, MPa The maximum value of the high pressure end setting range: expressed in Arabic numerals, MPa The basic code of pressure controller
Model example:
High and low pressure controller, the maximum value of the high pressure end setting range is 3MPa, the maximum value of the low pressure end setting range is 0.6MPa, special for Freon, model is YK3/0.6F.
4 Technical requirements
4.1 General requirements
The controller shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.2 Controller working conditions
a. Ambient temperature: 20~50℃,
b. Relative humidity: not more than 85%.
4.3 Performance of controller
4.3.1 Setting indication deviation and repeated action deviation The setting indication deviation and repeated action deviation of the disconnection pressure (pressure difference) of the controller within the set pressure range shall comply with the provisions of Table 3. 4.3.2 Air tightness
The bellows assembly of the controller shall be tested for air tightness and free of leakage. 4.3.3 Insulation performance
The insulation resistance between the live parts and the non-live metal parts of the controller shall be not less than 10MQ. 4.3.4 Dielectric strength
The controller shall be subjected to a dielectric strength test, and there shall be no breakdown and flashover between the live parts and the non-live metal parts. 4.3.5 High temperature resistance
When the test temperature is 50±3℃, the controller shall be free of cracks and deformation after the test and shall comply with the provisions of Articles 4.3.1 to 4.3.4. 1491
High pressure controller
Low pressure controller
High and low pressure controller
Oil pressure differential controller
4.3.6 Low temperature resistance
High pressure end
Low pressure end
High pressure end
Low pressure end
JB/T 7961
Set indication deviation
±0.060
≤±0.008
》±0.008
》±0.030
Repeat action deviation
≤±0.005
From±0.025
》±0.005
When the test temperature is -20±3℃, the controller shall be free of cracks and deformation after the test and meet the requirements of 4.3.1~4.3.4. 4.3.7 Moisture resistance
The controller shall be free of cracks and deformation after the moisture test and meet the requirements of 4.3.1~4.3.4. 4.3.8 Vibration resistance
The controller shall be able to work normally after the vibration test and meet the requirements of 4.3.1~4.3.4. 4.3.9 Impact resistance
The controller shall be able to withstand non-multiple mechanical shocks that may occur during transportation or use. After the simulation test, there shall be no cracks or deformation, and it shall comply with the provisions of Articles 4.3.1 to 4.3.4.
4.3.10 Durability
4.3.10.1 After 1000 action tests, the controller shall comply with the provisions of Article 4.3.1. 4.3.10.2 After 1×10″ life test, the controller shall comply with the provisions of Articles 4.3.2 to 4.3.4 and Table 4. Table 4
High pressure controller
High and low pressure controller high pressure end
Low pressure controller
High and low pressure controller low pressure end
Oil pressure differential controller
4.4 Other requirements for controllers
4.4.1 The micro switch of the controller is open and closed The action should be flexible and free, the connection points should be firm and reliable, 4.4.2 The surface of chrome-plated and galvanized parts should be evenly colored and free of obvious scratches and flow marks. Repeated action deviation
≤±0.075
≤±0.006
≤±0.035
4.4.3 When the inlet and outlet wires of the controller terminals pass through the shell, firm and reliable insulating rubber rings should be installed on the inlet and outlet holes. 4.4.4 The bellows of the controller should be Comply with the provisions of JB/T6169. 4.4.5 The micro switch of the controller shall comply with the provisions of JB3022. 4.4.6 The spring of the controller shall comply with the provisions of GB1239.1~～1239.3 and GB1239.5. 4.5 Quality Assurance
If the user complies with the provisions of the product manual, within 18 months from the date of shipment from the manufacturer, if the controller is damaged or fails to work normally due to poor manufacturing quality, the manufacturer shall be responsible for free repair or replacement (excluding wearing parts). 1492
5 Test method
5.1 General test conditions
a. Ambient temperature: 5～35℃;
b. Relative humidity of air: 45%～85%;
c. Frequency fluctuation: rated frequency ±1%;
d. Voltage fluctuation: rated voltage ±3%. 5.2 Performance test
5.2.1 Air tightness test
JB/T 7961—95
Install the controller bellows assembly on the air tightness test device, put it into a container containing anhydrous alcohol according to the pressure specified in Table 5 and observe for 5 minutes. It should meet the requirements of Article 4.3.2.
High pressure controller
High and low pressure controllers' high pressure ends
Low pressure controller
Low pressure end of high and low pressure controllers
Oil pressure differential controller
5.2.2 Test of setting indication deviation and repeated action deviation
2.3 (for nitrogen and Freon)
1.65 (for Freon crystal)
Install the controller on the test device, use a pressure gauge with an accuracy of not less than 0.4 to test the upper, middle and lower limits of the controller's setting range value, test each point three times, and its deviation should meet the requirements of Article 4.3.1. 5.3 Insulation performance test
Use a 500V megohmmeter to test the insulation resistance between the live parts and the non-live metal parts of the controller. The value shall comply with the provisions of Article 4.3.3.
5.4 Electric strength test
Use an AC voltage with a frequency of 50Hz and close to a sine wave to test the electric strength between the live parts and the non-live metal parts for 1 minute according to the conditions specified in Table 6. It shall comply with the provisions of Article 4.3.4. Table 6
5.5 Heat resistance test
According to the test method specified in GB2423.2Bb, place the controller in a 50±3C high temperature box for 48 hours, take it out and place it in a well-ventilated environment, recover for 1 hour, and without any adjustment, the retest performance shall comply with the provisions of Article 4.3.5. 5.6 Low temperature resistance test
According to the test method specified in GB2423.1Ab level, place the controller in a low temperature box at 20±3°C for 48 hours, take it out and place it in a well-ventilated environment, recover for 1 hour, without any adjustment, the re-test performance should meet the requirements of Article 4.3.6. 5.7 Moisture resistance test
According to the test method specified in GB2423.3Ca level, place the controller in a damp heat box with a temperature of 40±2°C and a relative humidity of 85% to 95%, after 48 hours of testing, take it out and place it in a well-ventilated environment, recover for 1 hour, without any adjustment, the re-test performance should meet the requirements of Article 4.3.7.
5.8 Vibration resistance test
JB/T 7961-95
Fix the controller on a vibration tester, and perform a vibration test of 10Hz frequency, 1.5mm amplitude, up and down, left and right, front and back for 1h each. The re-tested performance shall meet the requirements of Article 4.3.8. 5.9 Impact test
Fix the controller on an impact tester, and perform a shock test of 5g acceleration up and down, left and right, front and back for one time each. The re-tested performance shall meet the requirements of Article 4.3.9.
5.10 Life test
Connect the controller to the life test device, use the solenoid valve unloading method to change the pressure in the bellows of the controller, and apply the rated voltage and rated current to the contacts. After continuous switching at a frequency of 6 times per minute for 1000 times, the re-test performance should meet the requirements of Article 4.3.10.1. After continuing the life test for 1×105 times, the re-test performance should meet the requirements of Article 4.3.10.2. 6 Inspection rules
General requirements
Each controller shall be inspected by the inspection department of the manufacturer in accordance with this standard and technical documents, and can only be shipped after passing the inspection. 6.2 Inspection classification
The items, technical requirements and test methods of factory inspection, type inspection and sampling inspection of controllers shall be in accordance with the requirements of Table 7. Table 7
Set indication error and repeated action error
Air tightness
Insulation performance
Electrical strength
Heat resistancebzxz.net
Low temperature resistance
Moisture resistance
Vibration resistance
Impact resistance
Durability
6.3 Factory inspection
1000 times
1×105 times
Factory inspection
Type inspection
After the controller is assembled, the factory inspection shall be carried out according to the items specified in Table 7. 6.4 Type inspection
Spot inspection
Technical requirements
4.3.10.1
4.3.10.2
Test method
When the controller is identified as a new product or there is a major reform of the old product, a type inspection should be carried out. Several test prototypes can be tested at the same time. 6.5 Sampling inspection
Sampling inspection is carried out once a quarter, and three units are inspected each time. If one unit fails, double the inspection should be carried out. If there is still one unit that fails, the batch of products is judged as unqualified.
7 Marking, packaging, transportation and storage
7.1 Marking
Each controller shall be labeled in a conspicuous and flat place. The label shall comply with the relevant provisions of GB/T13306 and indicate the following1494
content:
Product model and name;
Factory number;
Manufacture year and month;
Manufacturer name.
7.2 Packaging
JB/T7961-95
Each controller shall be packed in a plastic bag and then placed in a packing box according to the specified quantity. 7.2.1
The large packing box shall be marked with the model, name, gross weight and manufacturer name of the controller, and shall have the signs of "Handle with care" and "Do not turn upside down"7.2.2
7.2.3Each controller shall be accompanied by the following documents. 7.2.3.1 Product certificate, including: a.
Product model and name;
Product factory number;
Inspection conclusion;
Inspection date;
Inspector's signature and official seal.
7.2.3.2 Product manual, including: Controller cross-section diagram:
Controller appearance and installation diagram.
7.3 Transportation
The controller should not be subjected to strong bumps, vibrations and impacts during transportation. 7.4 Storage
The controller should be stored in a well-ventilated warehouse to prevent rust and mildew during storage. Additional notes:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shanghai Constant Temperature Controller Factory. The main drafters of this standard are Li Yulin and Yao Yuehong. 14959 Impact test
Fix the controller on the impact test machine and perform an impact test with an acceleration of 5g up and down, left and right, and front and back. The retest performance should meet the requirements of Article 4.3.9.
5.10 Life test
Connect the controller to the life test device and use the solenoid valve unloading method to change the pressure in the bellows of the controller, and apply the rated voltage and rated current to the contacts. After 1000 times of continuous switching at a frequency of 6 times per minute, the retest performance should meet the requirements of Article 4.3.10.1. Then, after continuing the life test for 1×105 times, the retest performance should meet the requirements of Article 4.3.10.2. 6 Inspection rules
General requirements
Each controller shall be inspected by the inspection department of the manufacturer in accordance with this standard and technical documents, and can only be shipped after passing the inspection. 6.2 Inspection classification
The items, technical requirements and test methods of factory inspection, type inspection and sampling inspection of controllers shall be in accordance with the requirements of Table 7. Table 7
Set indication error and repeated action error
Air tightness
Insulation performance
Electrical strength
Heat resistance
Low temperature resistance
Moisture resistance
Vibration resistance
Impact resistance
Durability
6.3 Factory inspection
1000 times
1×105 times
Factory inspection
Type inspection
After the controller is assembled, the factory inspection shall be carried out according to the items specified in Table 7. 6.4 Type inspection
Spot inspection
Technical requirements
4.3.10.1
4.3.10.2
Test method
When the controller is identified as a new product or there is a major reform of the old product, a type inspection should be carried out. Several test prototypes can be tested at the same time. 6.5 Sampling inspection
Sampling inspection is carried out once a quarter, and three units are inspected each time. If one unit fails, double the inspection should be carried out. If there is still one unit that fails, the batch of products is judged as unqualified.
7 Marking, packaging, transportation and storage
7.1 Marking
Each controller shall be labeled in a conspicuous and flat place. The label shall comply with the relevant provisions of GB/T13306 and indicate the following1494
content:
Product model and name;
Factory number;
Manufacture year and month;
Manufacturer name.
7.2 Packaging
JB/T7961-95
Each controller shall be packed in a plastic bag and then placed in a packing box according to the specified quantity. 7.2.1
The large packing box shall be marked with the model, name, gross weight and manufacturer name of the controller, and shall have the signs of "Handle with care" and "Do not turn upside down"7.2.2
7.2.3Each controller shall be accompanied by the following documents. 7.2.3.1 Product certificate, including: a.
Product model and name;
Product factory number;
Inspection conclusion;
Inspection date;
Inspector's signature and official seal.
7.2.3.2 Product manual, including: Controller cross-section diagram:
Controller appearance and installation diagram.
7.3 Transportation
The controller should not be subjected to strong bumps, vibrations and impacts during transportation. 7.4 Storage
The controller should be stored in a well-ventilated warehouse to prevent rust and mildew during storage. Additional notes:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shanghai Constant Temperature Controller Factory. The main drafters of this standard are Li Yulin and Yao Yuehong. 14959 Impact test
Fix the controller on the impact test machine and perform an impact test with an acceleration of 5g up and down, left and right, and front and back. The retest performance should meet the requirements of Article 4.3.9.
5.10 Life test
Connect the controller to the life test device and use the solenoid valve unloading method to change the pressure in the bellows of the controller, and apply the rated voltage and rated current to the contacts. After 1000 times of continuous switching at a frequency of 6 times per minute, the retest performance should meet the requirements of Article 4.3.10.1. Then, after continuing the life test for 1×105 times, the retest performance should meet the requirements of Article 4.3.10.2. 6 Inspection rules
General requirements
Each controller shall be inspected by the inspection department of the manufacturer in accordance with this standard and technical documents, and can only be shipped after passing the inspection. 6.2 Inspection classification
The items, technical requirements and test methods of factory inspection, type inspection and sampling inspection of controllers shall be in accordance with the requirements of Table 7. Table 7
Set indication error and repeated action error
Air tightness
Insulation performance
Electrical strength
Heat resistance
Low temperature resistance
Moisture resistance
Vibration resistance
Impact resistance
Durability
6.3 Factory inspection
1000 times
1×105 times
Factory inspection
Type inspection
After the controller is assembled, the factory inspection shall be carried out according to the items specified in Table 7. 6.4 Type inspection
Spot inspection
Technical requirements
4.3.10.1
4.3.10.2
Test method
When the controller is identified as a new product or there is a major reform of the old product, a type inspection should be carried out. Several test prototypes can be tested at the same time. 6.5 Sampling inspection
Sampling inspection is carried out once a quarter, and three units are inspected each time. If one unit fails, double the inspection should be carried out. If there is still one unit that fails, the batch of products is judged as unqualified.
7 Marking, packaging, transportation and storage
7.1 Marking
Each controller shall be labeled in a conspicuous and flat place. The label shall comply with the relevant provisions of GB/T13306 and indicate the following1494
content:
Product model and name;
Factory number;
Manufacture year and month;
Manufacturer name.
7.2 Packaging
JB/T7961-95
Each controller shall be packed in a plastic bag and then placed in a packing box according to the specified quantity. 7.2.1
The large packing box shall be marked with the model, name, gross weight and manufacturer name of the controller, and shall have the signs of "Handle with care" and "Do not turn upside down"7.2.2
7.2.3Each controller shall be accompanied by the following documents. 7.2.3.1 Product certificate, including: a.
Product model and name;
Product factory number;
Inspection conclusion;
Inspection date;
Inspector's signature and official seal.
7.2.3.2 Product manual, including: Controller cross-section diagram:
Controller appearance and installation diagram.
7.3 Transportation
The controller should not be subjected to strong bumps, vibrations and impacts during transportation. 7.4 Storage
The controller should be stored in a well-ventilated warehouse to prevent rust and mildew during storage. Additional notes:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shanghai Constant Temperature Controller Factory. The main drafters of this standard are Li Yulin and Yao Yuehong. 1495
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