This standard specifies the technical requirements for rubber bellows mechanical seals as well as the requirements for performance, testing, installation and use. JB/T 6616-1993 Technical requirements for rubber bellows mechanical seals JB/T6616-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T6616-1993
Rubber bellows mechanical seal
Published on 1993-05-07
Ministry of Machinery Industry of the People's Republic of China
Technical conditions
Implementation on 1994-01-01
Mechanical Industry Standard of the People's Republic of China
Rubber bellows mechanical seal
1 Subject content and scope of application
Technical conditions
JB/T 6616-1993
This standard specifies the technical requirements for rubber bellows mechanical seals as well as requirements for performance, testing, installation and use. This standard applies to rubber bellows mechanical seals for various centrifugal pumps and similar rotary machinery. The working conditions are: a. Sealing chamber pressure: 0~0.8MPa
b. Sealing chamber temperature: -20℃~100℃;
Sealing chamber medium: clean water, oil or general weakly corrosive liquid; c.
d. Linear speed: not more than 10m/s:
e. Shaft (or sleeve) outer diameter: 10~80mm. 2 | |tt | 22 017
JB/JQ9012
JB/JQ9013
3Technical requirements
General tolerancesTolerances without indication for linear dimensions
Shape and position tolerancesProvisions for tolerances without indicationTypes, main dimensions, materials and identification marks of mechanical sealsMethod for compiling product models of mechanical seals
Test specifications for mechanical seals
O-rings for mechanical seals
Cylindrical helical springs for mechanical seals
Technical conditions for acceptance of mechanical seal products
Technical conditions for carbon graphite sealing rings for mechanical sealsTechnical conditions for silicon nitride sealing rings for mechanical sealsTechnical conditions for roughness of alumina ceramic sealing rings for mechanical sealsRubber bellowsThe structural type of mechanical seals shall comply with the provisions of GB6556, or be designed according to the user's conditions. 3.1
3.2 Rubber bellows mechanical seals shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 3.3 Technical requirements for materials
3.3.1 The material code shall comply with the relevant provisions of GB6556. 3.3.2 Physical and mechanical properties of rubber: Shore hardness A65 ± 5°, the rest shall comply with the provisions of ZBJ22002. 3.3.3 Other materials shall comply with the provisions of relevant standards or technical documents. 3.4 Technical requirements for main parts
The flatness of the sealing end face of the sealing ring is 0.0009mm, and the sealing end face roughness R values ​​of the hard and soft material sealing rings are 0.2μm and 0.4μm respectively.
Approved by the Ministry of Machinery Industry on May 7, 1993
Implemented on January 1, 1994
JB/T 6616-1993
The parallelism of the sealing end face of the sealing ring to the end face in contact with the auxiliary sealing ring shall comply with the 9th grade tolerance requirement in GB1184. 3.4.3
Requirements.
The verticality of the sealing end face of the sealing ring to the outer circle (or inner hole) in contact with the auxiliary sealing ring shall comply with the 9th grade tolerance requirement in GB1184. The surface roughness R value of the contact part between the sealing ring and the auxiliary sealing ring is 3.2um. The dimension tolerance zone of the outer circle (or inner hole) in contact with the auxiliary sealing ring is h8 (or H8). Graphite rings, rubber bellows and assembled sealing rings shall be subjected to water pressure test (or air tightness test). The test pressure is 3.4.67
1.25 (or 1.05) times the working pressure. There should be no cracking or leakage for 10 minutes. 3.4.7 Silicon nitride and alumina ceramic sealing rings should comply with the provisions of JB/JQ9012 and JB/JQ9013 respectively. Carbon graphite sealing rings should comply with the provisions of ZBJ22017. 3.4.8
3.4.9 The technical requirements of springs should comply with the provisions of ZBJ22004. The technical requirements of O-rings should comply with the provisions of ZBJ22002. 3.4.10
1 When only the rubber bellows is used for elastic force compensation, the rubber bellows shall be subjected to elasticity test after assembly. The compression test range is the working compensation amount of the bellows. Within this range, the bellows is compressed and maintained for 24 hours, and its average elastic force value shall not be less than the design required elastic force. 3.4.12 The design of the rubber bellows shall ensure the reliability of sealing and torque transmission. 3.4.13 The surface of the bellows and other rubber auxiliary seals (L pads, square rings, etc.) shall be smooth and flat, without bubbles, slag inclusions, uneven defects, and flash is not allowed in the sealing part. 3.4.14 The tolerance grade of the unindicated tolerance size of the parts shall be f (precision grade) grade specified in GB/T1804. 3.5 Performance requirements
3.5.1 Leakage: When the outer diameter of the shaft (or sleeve) is greater than 50mm, the leakage shall not exceed 5mL/h; when the outer diameter of the shaft (or sleeve) is not greater than 50mm, the leakage shall not exceed 3mL/h.
3.5.2 Wear: The size of the wear must meet the requirements of the service life of the mechanical seal. Usually, the test is carried out with clean water as the medium. After 100h of operation, the wear of any sealing ring shall not exceed 0.03mm. 3.5.3 Service life: The service life shall not be less than 4000h, and this limit shall not apply when the conditions are harsh. 4 Test and inspection methods
New products must be tested in accordance with JB4236. Before the finalized products leave the factory, they shall be tested in accordance with JB4236. 4.2
For rubber bellows mechanical seals that require air tightness tests, the air tightness test method shall be used. 4.4
The flatness of the sealing end face of the sealing ring is measured by the "level plane crystal and monochromatic light source interference method. 4.5
The surface roughness of the sealing ring is checked by a roughness measuring instrument or a sample block comparison method. The surface quality of the rubber parts is checked with the naked eye or a five-fold magnifying glass. 4.6
The hardness of the rubber is checked with a Shore hardness tester. 4.8 The inspection of other technical requirements shall be carried out in accordance with the methods specified in the relevant standards. 5 Inspection rules
5.1 The factory inspection items shall include rubber hardness, size and shape and position tolerances, flatness, sealing performance and appearance quality. Among them, size, shape and position tolerances and appearance quality are full inspection items, and the rest are random inspection items. 5.2 Type The inspection items are all the items specified in Articles 3.3, 3.4 and 3.5 of this standard. 2
JB/T6616-1993
Type inspection shall be carried out in any of the following circumstances: Finalization of new design products:
b. Product transfer to another factory;
When there are major changes in structure, materials and production process that affect product performance:
d. Continuous production for 5 years;www.bzxz.net
e. Production suspension for more than 1 year:
f. There is a big difference between the factory inspection results and the type inspection results; 9. The superior quality supervision agency requires inspection. 5.2.2
Using the same batch of raw materials , products continuously produced by the same process are considered a batch. Inspection is carried out in batches,
5.3 Products are sampled and inspected according to the single sampling plan specified in GB2828, with a special inspection level of S-4 and an AQL of 4.0. Products can only leave the factory after passing the inspection.
Installation and use requirements
1 Shaft (or sleeve) where mechanical seal is installed 6.1.1
The radial runout tolerance shall be in accordance with the provisions of Table 1.
Shaft (or sleeve outer diameter)
Surface roughness R. The value is 1.6μm.
Outer diameter dimension tolerance zone h8.
Runout tolerance
Installation of rotating ring auxiliary seal ring (or The end of the shaft (or sleeve) of the rubber bellows shall be as specified in Figure 1. Smooth connection
6.2 The axial movement of the rotor shall not exceed 0.3mm. 6.3 The runout tolerance of the locating surface of the sealing cavity and the sealing end cover to the shaft (or sleeve) surface shall be as required in Table 1. 6.4
Requirements for sealing end cover (or housing)
6.4.1 The surface roughness R value of the contact part between the sealing end cover (or housing) and the auxiliary sealing ring is 3.2μm. 6.4.2
The end of the hole of the end cover (or housing) for installing the stationary ring auxiliary sealing ring shall be as specified in Figure 2 and Table 2. mm
Shaft (or sleeve) outer diameter
JB/T 6616-1993
Noodles and fragrant connection
Before installation, check whether the main seals have any damage that affects the sealing performance, and replace or repair them in time6.5
During installation, the shaft (or sleeve), seal cavity, seal end cover and seal itself must be cleaned to prevent impurities from entering the seal. During installation, the product installation instructions or samples should be followed to correctly install and ensure the installation dimensions. Acceptance rules
Product acceptance should comply with the provisions of ZBJ22006. Marking, packaging and storage
Product models should comply with the provisions of GB10444.
The manufacturer's logo should be on the product.
The product should be cleaned and rust-proofed before packaging. The product name, model, specification, quantity and manufacturer's name should be marked on the packaging box. 8.4
8.5The product packaging box should be accompanied by a certificate of conformity, which should include the seal model, specification, manufacturer's name, technical inspection mark and date.
The product name, quantity, weight, consignee, manufacturer's name and words such as "moisture-proof" and "handle with care" should be marked on the packaging box. The packaging should be able to prevent the product from being damaged or lost during transportation and storage. The relevant technical documents and instructions for use should be placed in moisture-proof bags and placed in the packaging box together with the product. 8.8
After acceptance, the product should be stored in a dark place at a temperature not lower than -15℃ and not higher than 40℃, and the shelf life should not exceed half a year. Additional remarks:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Sealing Technology Research Institute of the Chemical Machinery Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Che Yunwei, Liu Shiping, Wei Jinxia, ​​Wang Tianyong, and Liang Haibo. People's Republic of China
Mechanical Industry Standard
Technical Conditions for Mechanical Seals of Rubber Bellows
JB/T 66161993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Sheet 1/2
Words 8,000
Format 880×1230
First edition in October 1993
First printing in October 1993
Print run 1-500
Price 2.00 Yuan
Mechanical Industry Standard Service Network: http:/www.JB.ac.cn99
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