HG/T 2477-1993 Technical requirements for mechanical seals for sand mills HG/T2477-1993 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T2477-93
Technical Conditions for Mechanical Seals for Sand Mills
Published on June 30, 1993
Ministry of Chemical Industry of the People's Republic of China
Implementation on January 1, 1994
Chemical Industry Standard of the People's Republic of China
Technical Conditions for Mechanical Seals for Sand Mills
1 Subject content and scope of application
HG/T2477-93
This standard specifies the requirements for the design, manufacture, use, testing, marking and installation of mechanical seals for closed sand mills. This standard is applicable to mechanical seals for sand mill shafts with working pressure of 0~0.4MPa in the sealing chamber, working temperature less than 80C, sealing liquid pressure of 0.3~0.5MPa, shaft diameter of 50~95mm, and speed not more than 3000r/min (hereinafter referred to as mechanical seals). Reference standards: GB1184 Shape and position tolerances Provisions for unmarked tolerances GB-1239.2 Technical conditions for cold-rolled cylindrical spiral compression springs GB1801 Tolerances and fits to 500mm holes, shaft tolerance zones and fits JB4127 JB4236 3 Design Technical conditions for mechanical seals Mechanical seal test specifications |For structural types and codes, see Table 1
Structural types
Externally mounted external flow single end face multi-spring type
Externally mounted internal flow single end face multi-spring type
Dual end face multi-spring type
3.2 Identification mark:
Shaft (or sleeve) outer diameter mm (expressed in 3 digits, add zero in front if insufficient) Code
Industry standard code
Marking example:
HG/T2477-131/055 indicates an externally mounted external flow single end face multi-spring mechanical seal for a sand mill, with a shaft outer diameter of 55mm. 3.3 For the mechanical seal structure and dimensions, see Figure 1 and Table 2 (Type 131), Figure 2 and Table 3 (Type 132), and Figure 3 and Table 4 (Type 133). Approved by the Ministry of Chemical Industry of the People's Republic of China on June 30, 1993, implemented on January 1, 1994
HG/T247793
1-Stationary ring: 2-Stationary ring seal: 3-Anti-rotation pin; 4-Rotating ring; 5-Rotating ring seal: 6-Fixed ring: 7-Drive pin: 8-Drive ring: 9-Drive screw 10-Adjusting pad: 11-Pumping: 12-Spring nominal||tt| |HG/T2477—93
Outer dimensions
HG/T2477—93
1-shaft: 2-rotating ring: 3-rotating ring seal: 4-drawing sleeve: 5-stationary ring; 6-stationary ring seal ring: 7--seat seal ring: 8--anti-rotation pin: 9--seat; 10-mesh seal: 11-skeleton oil seal: 12-elastic; 13-driving screw 2
HG/T 24T7-
1-Anti-rotation pin: 2-Pull-out: 3-Shaft sleeve: 4Stationary ring seal: 5Stationary ring; 6-Rotating ring: 7Rotating ring seal: 8Pressure ring; 9-Impeller; 10-Drive pin: 11-Clamp nut: 12-Balance pin; 13-Spring
3.4Material of main parts:
HG/T2477-93
3.4.1The rotating ring and the stationary ring are both made of tungsten carbide hard alloy, with grades YG6 and YG8. 3.4.2The rotating ring seat and the stationary ring seat are made of 2Cr13. 3.4.3The rotating ring seal and the stationary ring seal are both fluororubber O-rings, 4 manufacturing
4.1Technical requirements for main parts
4.1.1The flatness of the sealing ring end face shall not exceed 0.0009mm, and the roughness Ra shall not exceed 0.1μm. H2
4.1.2 The verticality between the end face of the stationary ring seal and the axis should not exceed the 7th grade tolerance of GB1184. 4.1.3 The fit between the seal ring and the ring seat is H7/S7, the outer diameter surface roughness Ra of the seal ring is not greater than 0.8μm, the aperture surface roughness Ra of the ring seat and the seal ring is not greater than 1.6um, 4.1.4 The tolerance values ​​of the main parameters of the spring are in accordance with the 1st grade accuracy requirements of GB1239.2. 4.1.5 The free height difference between each spring in the same set of mechanical seals is not greater than 0.5mm4.2 Assembly
4.2.1 The outer diameter dimension tolerance of the shaft (or sleeve) where the mechanical seal is installed is h9, and the surface roughness Ra is not greater than 1.6μm. 4.2.2 The radial runout tolerance of the shaft (or sleeve) where the mechanical seal is installed should be no more than 0.08mm, and the axial runout of the shaft should be no more than 0.2mm.
4.23 The auxiliary device for flushing the mechanical seal should be intact, and the quality of the flushing liquid or sealing liquid should strictly comply with the requirements of the instructions. The liquid level should be kept within 5mm above and below the liquid level indicator line, and the flow of the flushing liquid should be clearly displayed. 5 Use
5.1 The leakage should not be greater than 5ml/h
5.2 The service life should be no less than half a year.
6 Test requirementswww.bzxz.net
6.1 When a new mechanical seal product is trial-produced, a type test must be carried out in accordance with JB4236. 6.2 Mechanical seals should be subjected to factory tests before leaving the factory. The test quantity is 1% of the products of the same specification from each batch. If there are less than 100 sets, at least two sets should be taken.
HG/T2477—93
6.3 Factory tests should include static pressure tests and operating tests. 6.3.1 The static pressure test pressure is 0.5MPa, and the test medium is clean water. The test lasts for 15min and the converted leakage should not be greater than 2m1/h. 6.3.2 The operating test pressure is the maximum operating pressure. The test medium is clean water or industrial lubricating oil with a viscosity of N5 or less (including NS) and the test lasts for 5h. Measure and record the medium pressure, temperature, speed and leakage disk once every hour. The leakage should not exceed 4mt/h.
7 Marking and packaging
7.1 The product identification mark, factory date and manufacturer name should be marked on the packaging box. 7.2 Each set of mechanical seals should be packed in a packaging box before leaving the factory and should be accompanied by a product certificate. 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 operating instructions according to user requirements. Additional notes:
This standard was proposed by China National Chemical Equipment Corporation and is under the jurisdiction of the Chemical Industry Special Seals Standardization Technical Committee of the Ministry of Chemical Industry. This standard was drafted by Chongqing Chemical Machinery Factory and Beijing Institute of Chemical Technology participated in the drafting. The main drafters of this standard are Wang Yongqi and Li Jihe. People's Republic of China
Chemical Industry Standard
Technical Conditions for Mechanical Seals for Sand Mills
HG/T2477-93
Compilation Department of Chemical Industry Standards
(Institute of Standardization, Ministry of Chemical Industry)
Postal Code: 100013
Printing Institute of Standardization, Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Format 880×12301/16 Number of Printed Sheets 14000 First Edition in August 1993
First Printing in August 1993
Number of Prints 1-1000
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