This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of ZBK type light industry special two-lobe Roots vacuum pump. This standard applies to ZBK type light industry special two-lobe Roots vacuum pump (hereinafter referred to as pump). QB/T 1444-1992 ZBK light industry special two-lobe Roots vacuum pump QB/T1444-1992 Standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
ZBK type two-lobe Roots vacuum pump for light industry
Subject content and scope of application
QB/T 1444—1992
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of ZBK type two-lobe Roots vacuum pump for light industry.
This standard applies to ZBK type two-blade Roots vacuum pump for light industry (hereinafter referred to as pump) 2
Reference standards
GB 191
Packaging storage and transportation graphic mark
GB/T1958 Shape and position tolerance detection regulations GB/T7772 Noise measurement method for variable volume vacuum pump QB/T842 General technical conditions for light industry machinery scales QB/T1445 Performance test method for wet Roots vacuum pump 3 Product classification
3.1 Type
The pump type is divided into horizontal and vertical types, as shown in the figure below. Horizontal: The center lines of the two rotors are in the same horizontal plane, and the airflow is vertical. Vertical: The center lines of the two rotors are in the same vertical plane, and the airflow is horizontal. Export
3.2 Model
Approved by the Ministry of Light Industry of the People's Republic of China on February 21, 1992Vertical
Implementation on August 1, 1992
3.3 Basic parameters
QB/T 1444--1992
Modification of design sequence number (expressed by A, B, C) Design sequence number (expressed by Arabic numerals) Vacuum pump code
-Special equipment code for papermaking machinery
The basic parameters shall comply with the provisions of Table 1.
Technical requirements
General requirements
Maximum pumping speed
m*/min
Rated vacuum
Rated pumping speed
m°/min
4.1.1 The pump shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. The manufacture of pumps shall comply with the relevant provisions of QB/T842.1~842.8. 4.1.2
4.2 Performance and operation requirements
4.2.1 The rated vacuum and rated pumping speed of the pump shall comply with the provisions of Table 1. 4.2.2 When the pump is operating at the rated vacuum, the total sound pressure level of the noise shall not be higher than 90dB(A). 4.2.3 There shall be no obvious leakage of air, oil or water when the pump is operating. 4.2.4 The temperature rise of the bearing shall not exceed 30℃, and the maximum temperature shall not exceed 70℃. 4.3 Processing quality requirements
4.3.1 The circular runout of the outer circle of the rotor group to the common axis of the bearing journal shall not be less than 7 levels. The parallelism of the two end faces of the pump body and the two end faces of the end cover shall not be less than 8 levels. 4.3.2www.bzxz.net
Motor power
4.3.3The bearing journal dimension tolerance shall not be less than Grade 6, and the surface roughness shall be R.1.6μm. 4.3.4The rotor assembly (including the shaft) shall be balanced, and its static balance accuracy shall not be less than G6.3, and its dynamic balance accuracy shall not be less than G3.2.4.4Assembly requirements
Inlet and outlet diameters
The normal clearance of the rotor working surface, the radial clearance between the rotor outer circle and the pump inner circle, and the axial clearance (one-way) between the rotor end face and the end cover (or positioning plate) shall all comply with the provisions of Table 2.
4.5 Appearance requirements
Normal clearance
0. 2~~0. 3
QB/T1444—1992
Radial clearance
0. 2 ~~ 0. 4
The paint of the pump shall comply with the provisions of QB/T842.7. 5 Test methods
5.14.2.1 Test in accordance with the provisions of QB/T1445. 5.24.2.2 Test in accordance with the provisions of GB/T7772. 5.34.2.3 Inspect by visual inspection and hand feel. 5.44.2.4 Measure the surface temperature of the bearing seat with a thermometer. 5.54.3.1,4.3.2 Test in accordance with the relevant provisions of GB/T1958. 5.64.3.3 Use general measuring tools and surface roughness testers with an accuracy of not less than 0.01mm or comparison samples for inspection. 5.74.3.4 Use static balance test equipment and hard-bearing dynamic balance test machines for testing respectively. 5.84.4 Use feeler gauge for inspection.
5.94.5 Follow the method of "Paint Inspection" in Chapter 6 of QB/T842.7. 6 Inspection and measurement
Axial clearance
0. 15~0. 3
6.1 Products must be inspected and qualified by the inspection department and accompanied by a certificate of conformity before they can leave the factory. 6.2 Inspection is divided into factory inspection and type inspection. All items except 4.2.2 and 4.2.4 are factory inspection items, and type inspection items are all contents of technical requirements.
6.3 Type inspection should be carried out in any of the following situations. a.
Trial production and identification of new products or old products in the factory; design changes with major changes in structure, materials and processes; inspections should be carried out every three years during normal production; when production is resumed after two years of suspension;
When the national quality supervision agency proposes a requirement for type inspection. e.
6.4 Sampling method
6.4.1 Type inspection shall be sampled at 2% of the batch, but not less than two units. 6.4.2 Factory inspection shall be carried out on each product. 6.5 Judgment rules
When all items to be inspected for type inspection are qualified, the batch of products is qualified. If there are unqualified ones, double sampling and re-inspection shall be carried out. If there are still unqualified items, each product shall be inspected.
7 Marking, packaging, transportation and storage
7.1 Marking
QB/T1444-1992
7.1.1 Each product shall have a product nameplate and a rotation direction plate fixed in a conspicuous position. The content of the nameplate shall include: a.
Manufacturer’s name;
Product model and name;
Main parameters of the product;
Product trademark;
Manufacture date and factory serial number.
The following markings shall be placed on the outside of the packaging box: product model, name and quantity;
name of the destination station (port) and departure station (port);
name of the receiving and shipping units;
net weight and gross weight;
box dimensions (length × width × height);
“Technical documents are in the box”;
packaging storage and transportation diagram, and shall comply with the provisions of GB191. 7.2 Packaging
7.2.1 The packaging shall be box packaging, and the technical requirements shall comply with the provisions of QB/T842.8. 7.2.2 Users can use simple packaging or no packaging according to the user's opinions when picking up the product. 7.2.3 The product shall be accompanied by the certificate of conformity, instruction manual, packing list and other technical documents when leaving the factory. 7.3 Transportation and storage
7.3.1 Transportation can be carried by transportation tools such as cars, trains, and ships. 7.3.2 When loading and unloading products during transportation, they must be operated according to the outer packaging of the box and the storage and transportation diagrams. 7.3.3 Products can be stored in the warehouse or under the canopy, but measures should be taken to prevent rain, water accumulation, and moisture. 7.3.4 When stored, they should be placed on a cushion and stable, 100 to 200 mm away from the ground. Only one unit can be placed in sequence, and they must not be stacked. 7.3.5 When the product is stored for more than one year, its shaft seal packing or oil seal and bearing grease should be checked and replaced. It can only be used or repackaged for storage after the trial run meets the technical requirements.
8 Quality Assurance
If the user complies with the transportation, storage, installation and use conditions specified in this standard and the manual, the manufacturer will be responsible for repairing or replacing parts for the user free of charge if the product cannot work normally or is damaged due to poor manufacturing quality within one year from the date of leaving the factory (except for wearing parts). Additional remarks:
This standard was proposed by the Technical Equipment Department of the Ministry of Light Industry and is under the jurisdiction of the National Light Industry Machinery Standardization Center. This standard was drafted by Shenyang Paper Machinery Factory and Sichuan Light Industry Machinery Factory. The main drafters of this standard are Rong Huahuan and Sun Tianrong.
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