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Stirring transmission device - Mechanical seal
HG21571-95
1 Subject content and scope of application
This standard specifies the type, size, material, technical conditions, marking and relevant use regulations of mechanical seals for stirring transmission devices.
This standard is applicable to stirring vessels with a design pressure of PN-0.11.6MPa (-1~16bar) and a design temperature of -20~+300℃, and is used for mechanical seals of transmission shafts. 127
GB1184
GB1239
GB1804
HG2099
HG21563
HG21565
HG 21566
HG21567
HG21568
HG21572
Cited standards
《Provisions for shape and position tolerances without indicating tolerances》《Ordinary cylindrical helical springs》
《Limit deviations of dimensions without indicating tolerances for tolerances and fits》《Dimension series and tolerances of O-rings for hydraulic and pneumatic applications》《Test specifications for mechanical seals for kettles》
《System combination, selection and technical requirements for agitating transmission devices》《Mounting bottom cover for agitating transmission devices》
《Agitating transmission devices - single-pivot frame》《Agitating transmission devices - double-pivot frame》《Agitating transmission devices - drive shaft》
《Agitating transmission devices - mechanical seal circulation protection system》 3 Types and dimensions
3.0.1 The types of mechanical seals in this standard shall be in accordance with the provisions of Table 3.0.1. Mechanical seal type
Double valve surface
Pressure level
(MPa）
Using temperature
20~150
20~300
Linear speed
Medium end
3.0.2 The structure and main dimensions of various types of mechanical seals shall be in accordance with the provisions of Figure 3.0.2-1~~3.0.2-5 and Table 3.0.2.
3.0.3 The bolt holes, sealing liquid inlet and outlet, leakage holes, lifting screw holes, and tightening studs of various types of mechanical seals shall correspond to the windows at the bottom of the HG21566 and HG21567 frames. 3.0.4 Designers can select different types of mechanical seals according to the working conditions, and the recommended working conditions shall be in accordance with the provisions of Table 3.0.4. 129
Emperor screw hole
Oil hanging hole
Oil filling hole
Pressure stud
2001 type
Figure 3.0.2-1
Oil filling hole
2002 type
Single end face balanced mechanical seal
(2001.2002 type, with built-in bearing)
Figure 3.0.2-2 Radial double end face balanced mechanical seal (2003 type)Emperor petal hole
Emperor screw hole
Oil filling hole
Stud
Single hole
2004 type
Oil hole
2005 type
Figure 3.0.2--3Double end face non Balanced mechanical seal injection single nipple
Compression stud
2006 type
(2004, 2005 type, with built-in bearing) Oil filling hole
2007 type
Figure 3.0.2-4 Double-end balanced mechanical seal (2006, 2007 type, with built-in bearing) 131
Figure 3.0.2-5 Double-end balanced mechanical seal (2008 type) Shaft diameter
Mechanical seal overall dimensions
Stud hole
(2001, 2003, 2004,
2006, 2008 not more than)
(2002, 2005
2007 not more than)
Sealing liquid inlet Outlet
(inch）
G1/2”
Pressure level
General medium
Flammable, explosive, toxic
General medium
Flammable, explosive, toxic
Recommended to use attenuation
Medium temperature
>80℃
>80℃
≤80℃
>80℃
Recommended to use mechanical seal
2001/2002
2004/2005
2003/2004/2005
2006/2007/2008| |tt||2003/2004/2005bzxz.net
2006/2007/2008
2003/2004/2005
Recommended use of circulation
Protection system flow
Flow 5
Flow 1, 4
Flow 7, 8
Flow 3, 8
Flow 6, 7
Flow 5, 6
Flow 2, 3
Flow 1, 2
Flow 7, 8
Flow 3, 8
Material and code
The common materials and codes of mechanical seal rotating rings, stationary rings, auxiliary seals, springs and structural parts shall be in accordance with the provisions of Table 4-1.
The recommended common material combinations are shown in Table 42. Materials and codes
Material of rotating ring and stationary ring
Carbon-graphite
At-graphite impregnated copper
Ab-graphite impregnated babbitt alloy
Bq-graphite impregnated phenolic resin
Bk-graphite impregnated ceramide resin
Bh--graphite impregnated epoxy resin
Cg--siliconized graphite||tt| |D-—Carbon steel
E-Chrome steel
F-Chrome-nickel steel
Chrome-nickel-molybdenum steel
H-Chrome-nickel steel alloy
K-Chrome-nickel saw steel alloy
High nickel alloy
Tin phosphor bronze
Alloy cast iron
Cast chrome steel
-Other metals
Metal surface fusion welding nickel-based alloy||tt| |Metal surface welding cobalt-based alloy
Metal surface welding iron-based alloy
J—Metal surface spraying
Ammide
Silicon nitride
Carbide
Tungsten carbide
Silicon carbide
L——Other carbides
Metal oxides
Aluminum oxide
Chromium oxide
Other metal oxides
Yt-Filled glass fiber polytetrafluoroethylene
Yb——Filled graphite polytetrafluoroethylene
——Other engineering plastics
Auxiliary sealing ring materials
Elastic materials
Nitrile rubber
Nylon rubber
Butyl rubber
Ethylene propylene rubber
Silicon rubber
Fluororubber
Rubber coated with polytetrafluoroethylene
Other elastic materials
Non-elastic materials
-PTFE
-Impregnated graphite
-Asbestos rubber material
Flexible stone
Other non-elastic materials
Springs and structural parts
F—Chromium-nickel steel
C—Chromium-nickel-molybdenum steel
High nickel alloy
Other materials
Highly corrosive
>80℃
>80℃
Graphite impregnated
Resin
Common material combinations
Medium side
Stationary ring
Tungsten carbide
Silicon carbide
Auxiliary seal diagram| |tt||N-butyl rubber
Fluororubber (V)
Rubber coating
Polytetrafluoroethylene
Chromium-nickel steel
Structural parts
Chromium-nickel-aluminum steelChromium-nickel steel
Rotating ring
Graphite impregnation
Table 4-2
Stationary ring
Resin tungsten carbide
Auxiliary sealing diagram
Nitrile rubber
Fluororubber
5 Technical conditions
5.1 Technical requirements for main parts
5.1.1 Requirements for flatness and roughness of sealing end face The flatness of the sealing end face shall not exceed 0.0009mm, the roughness Ra of the sealing end face of hard material shall not exceed 0.2um; the roughness Ra of the sealing end face of soft material shall not exceed o.4um. 5.1.2 The parallelism of the end faces of the stationary ring and the rotating ring seals in contact with the auxiliary seal rings shall comply with the 7th grade tolerance of GB1184.
5.1.3 The surface roughness Ra of the contact parts between the stationary ring and the rotating ring and the auxiliary seal ring shall not exceed 3.2um, the outer circle or inner hole size tolerance is h8 or H8.
5.1.4 The verticality of the outer circle of the stationary ring seal end face and the stationary ring auxiliary seal circle, and the verticality of the inner hole of the rotating ring seal end face and the rotating ring auxiliary seal contact shall be in accordance with the 7th grade tolerance of GB1184. 5.1.5 The limit deviation of the uninjected tolerance size of the parts shall be in accordance with the IT12 grade tolerance of GB1804. 5.1.6 Graphite rings, filled polytetrafluoroethylene rings, and assembled rotating rings and stationary rings shall be subjected to water pressure test. The test pressure is 1.5 times the design pressure, lasting for 10 minutes, and there should be no leakage. 5.1.7 The tolerance values of the spring inner diameter, outer diameter, free height, working pressure, and verticality of the spring center line and the two end faces shall be in accordance with the first-level accuracy requirements of GB1239.
5.1.8 For multi-spring mechanical seals, the free height difference between the springs in the same set of mechanical seals shall not exceed 0.5mm. 5.1.9 The inner hole size tolerance of the spring seat and the transmission seat is F9, and the surface roughness Ra is not more than 3.2μm. 5.1.10 The size series and tolerance of the O-shaped rubber seal ring shall comply with GB3452.1. Its technical conditions shall comply with the provisions of relevant standards. 5.1.11
The built-in bearing used for the mechanical seal is a spherical roller bearing. 5.2 Mechanical seal performance requirements
5.2.1 Leakage
5.2.1.1 The method for measuring leakage shall comply with the provisions of HG2099. The leakage is the amount of equivalent liquid volume under the pressure, and the provisions are: when the shaft diameter is greater than 80mm, the leakage is not more than 10ml/h; when the shaft diameter is not more than 80mm, the leakage is not more than 8ml/h. Single-end mechanical seals only conduct qualitative inspections on leakage, and are qualified if there are no obvious bubbles observed by naked eyes. 5.2.1.2 When the sealed medium is liquid, the average leakage is the same as 5.2.1.1. 5.2.2 Wear
The wear must meet the requirements of the service life of the mechanical seal. Under normal circumstances, after 100 hours of operation, the wear of the sealing ring of soft material is not more than 0.03mm. 5.2.3 Under the condition of reasonable selection, correct installation and use, when the sealed medium is neutral, weakly corrosive gas or liquid, the service life of the mechanical seal is generally 8000 hours; when the sealed medium is a highly corrosive or volatile gas, the service life of the mechanical seal is generally 4000 hours, and special circumstances are not subject to this limit. 5.3 Testing of mechanical seals
5.3.1 New mechanical seal products must undergo type testing, and the testing must be carried out in accordance with the requirements of HG2099. 5.3.2 Mechanical seal products must undergo factory testing before leaving the factory, and the testing must be carried out in accordance with the requirements of HG2099. 5.4 Installation and use requirements
5.4.1 The installation and use requirements of mechanical seals must comply with the relevant provisions of HG21563. 5.4.2 The installation should be carried out correctly according to the product installation and use instructions or samples. 5.5 Marking and packaging
5.5.1 The product identification mark, production date, and manufacturer name should be marked on the packaging box. .5.5.2 The manufacturer's logo should be on the product. 5.5.3 The product certificate should be attached to the packaging box. The certificate content includes: product model, specifications, quantity, manufacturer name, and the signature and date of the inspection department and inspection personnel. 5.5.4 The manufacturer shall provide product installation and use instructions according to user requirements. 138
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