HJ 2524-2012Technical requirement for environmental protection products. Single screw pump (English PDF)

3.1 Single screw pump Single screw pump

a rigid rotor (screw) is rotated around the eccentric circle in the elastic stator (bushing) cavity, thereby continuously the pump that transports media from one end to the other.

4.1 Manufacturing

4.1.1 The single screw pump shall be manufactured in accordance with the product drawings and technical documents approved by the prescribed procedures and in accordance with the provisions of this standard.

4.1.2 The single-screw pump stator and rotor spiral surface should be accurate, the surface should not have defects, and the surface roughness should not be lower than Ra0.8 µm.

4.2 Assembly

4.2.1 The non-machined surface of the single-screw pump that is in contact with the medium to be conveyed shall be rust-proof (except stainless steel) before assembly.

4.2.2 The bearing housing and the universal joint seal sleeve shall be filled with 2/3 cavity grease.

4.2.3 The temperature rise of the bearing should not exceed the ambient temperature of 35 ° C, and its maximum temperature should not exceed 80 ° C.

4.2.4 Single screw pump shaft seals are mechanical or packing seals. Both seals should be interchangeable without replacement of the housing. Shaft seal the corresponding position of the corresponding bearing housing shall be provided with a leakage recovery device interface or a leakage drainage outlet pipe interface. Shaft seal leakage should be in accordance with JB/T Provision of 8644.

4.2.5 After the single-screw pump has been tested, the internal effluent should be removed and the rust-proof treatment should be repeated. Single screw pump metal zero (part) surface coating the paint requirements shall be in accordance with JB/T 4297.

4.3 Materials and Parts, Parts

4.3.1 The main components of the single-screw pump shall be based on the chemical and physical properties of the medium to be transported and the pressure of the pump.

Make a choice.

a) Zero, parts (inhalation body, discharge body, shaft seal chamber, etc.) in contact with the medium should be made of cast iron, cast steel and stainless steel;

b) The shaft should be made of 45 high quality carbon steel, 40Cr alloy structural steel or stainless steel;

c) The materials of the rotor and stator should be selected according to Table 1. Materials that have been tested and verified to not affect performance are also available. Material There should be a certificate of inspection.

Table 1 rotor, stator material table

Conveying medium stator material rotor material Pharmacy Nitrile rubber (NBR) EPDM 12Cr18Ni9 (S30210) 06Cr19Ni10 (S30408) 022Cr17Ni12Mo2 (S31603) 40Cr Send filter sludge (with less than 5% mud) Nitrile rubber (NBR) Dewatered sludge (15-20% mud) Wear-resistant rubber Cr12 Desulfurized lime slurry, desulfurized gypsum EPDM rubber 022Cr17Ni12Mo2 (S31603)

4.3.2 The cast iron and cast steel parts of the single screw pump shall comply with the provisions of JB/T 6880.1 and JB/T 6880.2 respectively.

4.3.3 Single screw pump suction and discharge flange connection size should be in accordance with the material and form, respectively, in accordance with GB/T 17241.6, GB/T Provisions of 17241.7, GB/T 9112, GB/T 9115.1, GB/T 9119 and GB/T 9124.

4.3.4 Parts and components (inhalation body, discharge body, sealed chamber) subjected to liquid pressure shall not leak.

4.3.5 The life of the single screw pump should be more than 2 years. The life of the main wearing parts of the stator and rotor should not be less than 1 year.

4.4 Conditions of use

a) The temperature of the conveying medium is 5 performance requirements

5.1 Performance

5.1.1 Single-screw pumps are classified into miniature, small, medium, large and extra large five-stage according to the flow rate. Flow tolerance of single screw pump it shall not be lower than the lower deviation specified in Table 3 of JB/T 8091-1998. The volumetric efficiency and total efficiency shall comply with the requirements of Table 2 of this standard.

Table 2 Basic parameters of single screw pump

Category level

Theoretical flow at 100 r Volumetric efficiency (etav) Total efficiency (eta) Rated pressure at no load the first type of micro <=10 >=96 >=65 >=55 the second type is small >10, <=50 >=96 >=70 >=64 the third type of medium >50, <=200 >=96 >=75 >=68 Fourth category Large >200, <=800 >=96 >=80 >=72 Extra large >800 >=96 >=85 >=76 Note. The volumetric efficiency etav and the total efficiency eta are the values of the stator and rotor relative sliding Vgm = 4 m/s.

5.1.2 Single-screw pump for.200 h reliability operation test under stator and rotor relative sliding speed Vgm= 4 m/s under specified pressure conditions After the test (the test medium is normal temperature or similar liquid), the reduction in no-load volumetric efficiency should not exceed 2%.

5.2 Vibration

The vibration level of the pump is evaluated according to the categories in Table 2 of this standard and Tables 1 and 3 of JB/T 8097-1999. Pump vibration level it is not divided into four grades A, B, C, and D, and grade D is unqualified.

5.3 Stability energy

Single-screw pump with rated rotor relative sliding speed Vgm= 4 m/s under rated pressure. When conveying normal temperature and clear water, the stator life shall not be allowed.

Below 3 000 h, the flow rate must not exceed 20%.

5.4 Noise

The noise value of a single screw pump must not exceed 76 dB(A).

7.1 Inspection classification

The inspection of single screw pumps is divided into factory inspection and type inspection.

7.2 Factory inspection

7.2.1 Each single screw pump shall be inspected before leaving the factory, and it shall pass the inspection and be accompanied by the product certificate before leaving the factory.

7.2.2 The factory inspection items are shown in Table 3.

Table 3 Single screw pump inspection items and requirements

No. Item Name Requirement Test Method Factory Inspection Type Inspection

1 Bearing temperature rise 4.2.3 6.1 sqrt sqrt 2 shaft seal leakage 4.2.4 6.2 sqrt sqrt

3 Painting quality 4.2.5 6.3 -- sqrt

4 Zero, component hydraulic test 4.3.4 6.4 sqrt sqrt

5 Performance 5.1 6.5 sqrt sqrt

6 Vibration 5.2 6.6 -- sqrt

7 Stability test 5.3 6.7 -- sqrt

8.1 Mark

8.1.1 Each single screw pump shall be set with product label in obvious position. The size and technical requirements of the label shall comply with GB/T 13306.

Provisions.

8.1.2 Each single screw pump shall have an obvious turning sign and a sign prohibiting dry running.

8.2 Packaging

The packaging of single screw pump should meet the requirements of GB/T 13384 and ensure that the pump and parts do not rust under normal transportation conditions.

Corrosion, damage and loss of accessories, spare parts and documents.

8.3 Transportation

The single screw pump should be fixed firmly during transportation to avoid impact and bump.

8.4 Storage

The single screw pump should be stored in a ventilated, sun-protected warehouse to avoid direct sunlight and prevent the rubber stator from aging.