JB/T 12843-2016Centrifugal refrigerant compressors (English PDF)

3.1 Centrifugal refrigerant compressor

A compressor that relies on the impeller to do work on the refrigerant vapor to increase the pressure and velocity of the refrigerant vapor, then converts the kinetic energy into pressure energy in the diffuser, so that the refrigerant vapor flows radially through the impeller.

3.2 Centrifugal refrigerant compressor unit

A unit assembled from a centrifugal refrigerant compressor, a prime mover and other accessories, used to compress refrigerant vapor.

3.3 Surging

An instability phenomenon that occurs during the operation of a compressor (unit), characterized by large fluctuations in the refrigerant vapor flow rate over time, accompanied by strong vibrations and noise.

3.4 Choking

An instability phenomenon that occurs during the operation of a compressor (unit), characterized by gas dynamic blockage, when the refrigerant vapor flow rate no longer increases with the action of the regulating mechanism.

4.1 Type

4.1.1 According to the structure, it is divided into open type and semi-closed type.

4.1.2 According to the number of stages, it is divided into single stage, double stage, multi-stage.

4.3 Nominal operating conditions

The nominal operating conditions of the compressor (unit) shall be as specified in Table 1.

5.1 General requirements

The compressor (unit) shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures (or the agreement between the user and the manufacturer).

5.2 Safety requirements

The safety requirements of the compressor (unit) shall comply with the provisions of GB 9237.

5.3 Performance requirements

5.3.1 Strength

5.3.2 Air tightness

When conducting air tightness test, the requirements are as follows. […]

5.3.3 Operation

The compressor (unit) shall be tested for operation; its operation shall be stable, without abnormal noise and severe vibration; the adjustment device shall be flexible and correct; the pressure, input power, temperature shall not fluctuate abnormally; the friction parts shall not have abnormal temperature rise. The unit assembled from the compressor that has passed the operation test does not need to be tested for operation.

5.3.7 Refrigeration (heating) capacity

The measured refrigeration (heating) capacity of the compressor (unit) shall not be less than 95% of the nominal refrigeration (heating) capacity.

5.3.8 Input power

The measured input power of the compressor (unit) shall not be greater than 110% of the nominal input power.

5.3.9 Refrigeration (heating) performance coefficient

The measured refrigeration (heating) performance coefficient of the compressor (unit) shall not be less than 95% of the indicated value.

5.3.10 Vibration

The measured vibration value of the compressor (unit) shall not be greater than the vibration limit indicated by the manufacturer.

5.3.11 Partial load operation

The compressor (unit) shall be subjected to partial load operation test; its refrigeration (heating) capacity and input power under partial load shall be measured; a partial load performance curve or performance table shall be drawn.

5.3.13 Winding temperature

The measured motor winding temperature of the compressor (unit) shall not be higher than the winding temperature limit specified by the manufacturer.

6.1 General requirements for the test

6.1.1 The compressor (unit) test device shall exclude non-condensable gases in the test system. Confirm that there is no refrigerant leakage.

6.1.2 The liquid pipeline and suction pipeline of the compressor (unit) test device shall be thermal-insulated.

6.1.8 The test cycle and data collection requirements, the allowable deviation of the test condition parameters, the measuring instruments and accuracy shall comply with the provisions of GB/T 5773.

6.1.9 The refrigeration capacity test of a single-stage compressor (unit) shall include two test methods. The selection and combination of test methods and the deviation between the test results of the two test methods shall comply with the provisions of GB/T 5773.

6.1.10 The heating capacity test of various compressors (units) and the refrigeration capacity test of multi-stage compressors (units) may be carried out using only one test method.

6.2 Test methods

6.2.1 Strength test

The methods of air pressure test, hydraulic test, burst test shall comply with the provisions of GB/T 19410.

6.2.2 Air tightness test

The method of air tightness test shall be in accordance with the provisions of GB/T 19410.

6.2.3 Operation test

The operation test of the compressor (unit) shall be carried out on the operation test bench. Check the assembly quality of its operating parts and the lubrication condition of the lubrication system. If it does not meet the requirements, the defects shall be eliminated and the test shall be repeated, until it is qualified. The operation test of the compressor (unit) can also be carried out on the compressor performance test bench.

6.2.7 Refrigeration (heating) capacity test

The test is carried out according to the nominal refrigeration (heat pump) working conditions specified in 4.3 and the method specified in Appendix C.

6.2.8 Input power test

At the same time as the test in 6.2.7 of this standard, the input power and working current of the compressor (unit) are measured and calculated, according to the method specified in GB/T 5773.

6.2.9 Refrigeration (heating) performance coefficient test

At the same time as the test in 6.2.7 of this standard, the refrigeration (heating) performance coefficient of the compressor (unit) is measured and calculated according to the method specified in GB/T 5773.

6.2.13 Winding temperature test

After the compressor (unit) runs at the maximum value of the motor design power for 15 minutes, record the temperature data measured by the embedded temperature sensor in the motor winding; record it every 5 minutes, until the measured data is stable.

7.1 Exit-factory inspection

Each compressor (unit) shall be subject to the exit-factory inspection; the inspection items shall be in accordance with the provisions of Table 2. If the exit-factory inspection has been completed at the supplier, the corresponding inspection and test report can be provided instead.

7.2 Sampling inspection

7.3 Type inspection

7.3.1 If a new product or a finalized product undergoes major improvements, the first product shall undergo type inspection; the inspection items shall be in accordance with the provisions of Table 2.

7.3.2 If a compressor (unit) fails during test operation, it shall be re-inspected after the fault is eliminated.

8.1 Marking

8.1.1 Each compressor (unit) shall have a permanent nameplate fixed in a conspicuous position; the nameplate shall comply with the provisions of GB/T 13306. The following information shall be marked on the nameplate.

8.1.2 The compressor (unit) shall be provided with signs indicating the operating status (such as the rotation direction of the compressor impeller, indicator instruments, control buttons, etc.) and safety signs (such as grounding devices, warning signs, etc.).

8.2 Packaging

8.2.1 The compressor (unit) shall be cleaned, dried, rust-proofed before packaging; then filled with 0.03 MPa ~ 0.05 MPa (gauge pressure) of dry nitrogen or corresponding refrigerant gas (unless otherwise it is dangerous).

8.2.2 The compressor (unit) packaging shall be provided with accompanying documents. Accompanying documents include product certificates, product manuals, packing lists, etc., which shall be moisture-proof and sealed, to ensure that they will not be damaged or damp during normal storage and transportation; it shall include the following contents. […]

8.3 Transportation and storage

8.3.1 The compressor (unit) shall not collide, tilt, or be exposed to rain or snow during transportation and storage.

8.3.2 The packaged compressor (unit) shall be stored in a dry and well-ventilated warehouse. […]