HG/T 2478-1993 Technical requirements for mechanical seals for glass-lined pumps HG/T2478-1993 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T 2478—93
25310445
Technical Conditions for Mechanical Seals for Sugar Glass Pumps
Published on 1993-06-30
Ministry of Chemical Industry of the People's Republic of China
Implementation on 1994-01-01
Chemical Industry Standard of the People's Republic of China
Technical Conditions for Mechanical Seals for Sugar Glass Pumps
Subject Content and Applicable Models
HG/T247893
This standard specifies the design, manufacture, use and testing of mechanical seals for sugar glass pumps. Marking and installation requirements, this standard applies to mechanical seals for glass pumps with working pressure of 00:3MPa, working temperature of 0~700, shaft speed not exceeding 30001/min, and shaft diameter of 30~80mm (hereinafter referred to as mechanical seals). 2 Reference standards
GB1184 Shape and position tolerance, provisions for unmarked tolerances GB1239.2 Technical conditions for cold-rolled cylindrical spiral compression springs GB2828 Batch inspection counting sampling procedures and sample tables (applicable to continuous batch inspection) JB4236 Mechanical seal test Test specification
ZB122004 Cylindrical screw for mechanical seal 3 Design
3.1 Structural type
The mechanical seal specified in this standard is an external single-end elastic roll tetraethylene bellows structural type, as shown in Figure 1. Figure
1 Sealing gasket 2 Stationary ring; 3-Swivel ring: 4-Elastic seat 5 Elastic; 6 Pressure nut: 7-Push wrench; 8-Cylindrical pin Approved by the Ministry of Chemical Industry of the People's Republic of China on June 30, 1993 and implemented on January 1, 1994
3.2 Specifications| |tt||See Table 1,
Identification mark
Marking example:
FTM-60Www.bzxZ.net
HG/T248—93
Appearance R and installation dimensions
Shaft diameter m
Mechanical seal
Glass
Corrosion-resistant pump series
Indicates mechanical seal for glass pump with shaft diameter of 60mm. 3.4 Materials of main parts
34.1 Rotating ring seal material The end face is filled with polytetrafluoroethylene, and the bellows is pure polytetrafluoroethylene ethylene, 34.2 The stationary ring material is ceramic,
3.4.3 The sealing gasket material is PTFE coated rubber 3, 4.4 The spring material is 0Cr18Ni9, 1Cr18Ni9 or 1Cr18Ni9Ti.4.
4.1 Main parts
4.1.1 The flatness of the stationary ring sealing end face is not greater than 0.0009mm: The surface roughness Ra of the sealing end face is not greater than 0.2m: 4.1.2 The verticality between the stationary ring sealing end face and the axis is in accordance with the 7th grade tolerance in GB1184, 4. 1.3 The inner hole size tolerance of the bellows part and the shaft is H9, and the surface roughness Ra is not more than 1.6 um. 41.4 The surface roughness Ra of the pressing end of the swivel part in contact with the shaft bearing is not more than 1.6 μm. 4.1.5 The tolerance value of the main parameters of the spring shall comply with the first-level accuracy requirements in ZBJ22004 or GB1239.2. 4.1.6 The free height between each spring in the same set of mechanical seals shall not be more than 0.5 mm. 4.1.7 The Shore A hardness of the sealing gasket rubber shall not exceed 60. 3.4.2 Assembly
4.2.1 The dimensional tolerance of the shaft diameter of the sealed part of the installation machine is h9, and the surface roughness Ra of the pressing surface of the pillow block shall not exceed 1.6. 42.2 The slight lateral movement of the shaft at the installation mechanical seal part shall not exceed 0.06 mm, 0.3 mm.
The shaft bearing plate shall not exceed
HG /T 2478 --93
4.2.3 The flatness of the compression end face (mushroom glass surface) between the pump body and the static ring of the machine seal should be no more than 0.1mm, and the verticality deviation with the rotating shaft should be no more than 0.1mm.
4.2.4 The tank part of the shaft should have a chamfer (1×45°) to facilitate installation. 4.2.5 The compression rate of the sealing gasket during assembly should not be more than 30%. 4.2.6 The rotating ring assembly should be subjected to static pressure test piece by piece. The static pressure test pressure is 1.25 compensation of the design force. The sealing medium is clean water. It lasts for 15 minutes and no leakage is required.
4.2.7 When installing the mechanical seal, it should be correctly installed according to the product manual or sample to ensure its normal operation. 5 Use
5.1 The mechanical seal leakage disc is determined according to the shaft diameter. When the shaft diameter is 45mm, the leakage is not more than 5ml/h. When the shaft diameter is ≤45mm, the leakage disc is not more than 3al/h.
5.2 The service life of the mechanical seal is not less than half a year. 6 Test
6.1 When a new mechanical seal product is trial-produced, a type test must be carried out in accordance with JB4236. 62 Factory tests include test run tests and operation tests. 6.21 The test run is to install the mechanical seal on the pump and test run it with the pump one by one. The test medium is clean water, and the outlet door is closed for 10m to ensure that there is no leakage. 62.2 The number of test runs for the operation test shall be sampled according to GB2828. The operating test pressure is the design pressure, the sealing medium is clean water, and the operation lasts for 5 hours. The medium pressure, temperature, speed and leakage are measured and recorded once every hour. The leakage volume requirements are the same as 5.1.7 Marking and packaging. 1 The packaging box should indicate the product identification mark, date of publication, and manufacturer name. 7.2 Each set of mechanical seals is packed in a packaging box before leaving the factory, and a product certificate should be attached. The certificate should have the product model, quantity, manufacturer name, signature and date of the inspection department and inspection personnel. 7.3 The manufacturer should provide installation and use instructions according to the user's requirements. Additional information: This standard is compiled by China Chemical Equipment Corporation. This standard is compiled by the Chemical Industry Special Seal Standardization Technical Department of the Ministry of Chemical Industry. This standard is funded by Beijing Chemical Equipment Factory and Beijing Chemical Industry University. The main drafters of this standard are Wang Yuxiang, Zhu Dagang, Lin Yanli, and Qian Jifan.
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