This standard specifies the terms, technical requirements, inspection rules and methods, test methods, etc. of welded metal bellows mechanical seals. This standard applies to welded metal bellows mechanical seals, and its working parameters are: working pressure 0~2MPa (single-layer corrugated plate), 2~5MPa (double-layer corrugated plate); working temperature is -200~300℃; speed is not more than 6000r/min; medium is clean water, oil, solvent and general corrosive liquid. JB/T 6373-1992 Technical conditions for welded metal bellows mechanical seals JB/T6373-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T6373-92
Welded Metal Bellows Mechanical Seals
Technical Conditions
Published on July 15, 1992bzxZ.net
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
Welded Metal Bellows Mechanical Seals
Technical Conditions
1 Subject Content and Scope of Application
JB/T637392
This standard specifies the terminology, technical requirements, inspection rules and inspection methods, test methods, etc. for welded metal bellows mechanical seals. This standard applies to welded metal bellows mechanical seals, and its working parameters are: working pressure 0~2MPa (single-layer corrugated plate), 2~5MPa (double-layer corrugated plate) (referring to the actual pressure in the seal chamber); working temperature is -200~300℃ (referring to the actual temperature in the seal chamber); speed is not more than 6000r/min; the quality is clean water, oil, solvent and general corrosive liquid 2 Reference standards
GB1184
Shape and position tolerance Provisions for mechanical seals without tolerance Type, main dimensions, materials and identification marks GB6556
ZBJ22002 O-rings for mechanical seals
Mechanical seal test specifications
ZB4236
3 Terms
3.1 Single-layer corrugated plate
Two corrugated plates are welded into a group.
3.2 Double-layer corrugated plate
Four corrugated plates are welded into a group.
3.3 Welded bellows assembly
A component consisting of a group of bellows and ring seats at both ends. 3.4 Welding mushroom
The welding seam between the wave plates has a mushroom-shaped cross section. Technical requirements
Welded metal bellows assembly
Appearance quality: The welding mushroom shall not have defects such as cracks, pores, impurities, etc. 4.1.1
When the welded metal bellows assembly is compressed to the working length, the elastic force shall meet the design value, and the tolerance is 15%. The self-exit height shall meet the design value, and the tolerance is 2mm. The parallelism tolerance of the ring seats at both ends is 0.5mm.
Based on the working height and the travel of 2mm, after repeated displacement changes 100 times within 30min, its elastic force and self-exit height shall meet the requirements of 4.1.5
Combined with 4.1.2 and 4.1.3.
The heat treatment hardness of the corrugated tube wave plate is 38~48HRC; the cold rolling hardness is 16~25HRC. 4.1.6
The shape of the coal mushroom is shown in Figure 1. Its width W is calculated according to formula (1) and formula (2): W=(2.2~3)×wave plate thickness.
Single-layer wave plate 1
Double-layer wave plate
Approved by the Ministry of Machinery and Electronics Industry on July 15, 1992 W=(4.2~5)×wave plate thickness..
Implemented on January 1, 1993
Both sides of the welded mushroom convex edge R should be symmetrical.
4.1.8 After the assembly is welded, a gas pressure leak test should be carried out. 4.2 Other main parts
μm.
JB/T637392
The flatness tolerance of the sealing end face is 0.0009mm, and the surface roughness of the sealing end face is: R.0.2um for hard materials; R.0.42 for soft materials. The surface roughness of the compensation ring assembly and the contact part between the non-compensation ring and the auxiliary seal is R.3.2um. 4.2.2
The flatness of the contact part between the non-compensation end face and the auxiliary seal shall comply with the 7-level accuracy requirements of GB1184. 4.2.4 The inner hole size tolerance of the transmission seat is D8. The surface roughness R.3.2um. 4.2.5 The O-shaped rubber ring shall comply with the provisions of ZBJ22002. 4.3 Performance requirements
Leakage
The average leakage of field use and operation test shall comply with the provisions of Table 1. Table 1
≤3000
≤6000
≤3000
≤6000
b. The average leakage of the static pressure test shall not exceed one third of that of the running test 4.3.2 Wear
Average leakage
Running test
Use clean water as the medium for the running test, the time is 100h, and the wear of any sealing ring shall not exceed 0.02mm: 4.3.3 Service life
The service life shall not be less than 4000h, except for special working conditions. 5
Inspection rules and methods
Inspection rules: Each set of products shall be inspected and qualified by the inspection department of the manufacturer, and shall be accompanied by a certificate of conformity before leaving the factory. 5.2
Inspection method
On-site use
Appearance quality inspection of welding mushrooms: Visual inspection with a 5x magnifying glass. If there is any objection, submit it to the metallographic laboratory for 100 times microscope measurement. 5.2.2
JB/T.6373-92
Elastic force measurement: Measure with a 2% precision elastic tension and compression tester. The free height of the welded metal bellows assembly is measured with a vernier caliper. The parallelism of the ring seats at both ends is measured with a micrometer. The width of the weld mushroom (W) is measured with a micrometer caliper. Wave plate hardness measurement: The hardness of two wave plates of the same batch of samples in the furnace during heat treatment is measured. Air pressure leak detection: The air pressure is 0.3~0.6MPa, the test time is 3min, and it is immersed in water. There must be no visible bubbles. Test method
The bellows mechanical seal test method is carried out in accordance with the provisions of JB4236, and its performance indicators should comply with the provisions of Articles 4.3.1 and 4.3.2. If there are special requirements, it shall be carried out in accordance with the provisions of the agreement. 6.2
7 Installation and use requirements
7.1 The shaft or sleeve on which the mechanical seal is installed.
7.1.1 The surface runout tolerance shall comply with the provisions of Table 2. Table 2
Shaft or sleeve outer diameter
>50~100
Surface roughness R, 1.6um.
Outer diameter dimension tolerance h7.
7.1.4 The end of the shaft or sleeve of the transmission seat shall be chamfered according to Figure 2. Surface runout tolerance
7.2 When the main engine with the mechanical seal installed is running, the axial runout of the rotor shall not exceed 0.3mm. 7.3
The surface runout tolerance of the positioning end face of the seal cavity and the seal end cover on the shaft or sleeve shall comply with the provisions of Table 2. The requirements for the seal end cover or housing shall comply with the provisions of Figure 3 and Table 3. 10°
Figure Sliding connection
Floating end cover
Sliding connection
b Supporting end cover
c Clamping end cover
Shaft or sleeve outer diameter
>35~48
>48~65
>65~75
>75100
JB/T637392
During installation, the shaft or sleeve, sealing cavity or sealing end cover and mechanical seal products must be cleaned to prevent debris from entering the sealing part. When the temperature of the conveying medium is too high or too low or contains impurities and particles, is flammable, explosive, or toxic, appropriate blocking, flushing, cooling, filtering and other measures must be adopted. Specific measures shall be carried out in accordance with the "Circulation System and Application Specifications of Mechanical Seals". 7.7
When installing mechanical seals, the installation dimensions of the mechanical seals shall be ensured according to the product manual or sample. Marking and packaging
The identification mark shall be marked on the packaging box in accordance with the provisions of GB6556. The product shall have the manufacturer's mark.
The packaging shall prevent damage to the product and loss of parts during transportation and storage. Each set of mechanical seals shall be accompanied by a certificate of conformity when leaving the factory. The certificate of conformity shall have the product model, quantity, manufacturer name, inspection department and inspection personnel's signature and date.
8.5The manufacturer shall provide product installation and use instructions according to user requirements. Additional notes:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Shanghai Pump Factory. The main drafters of this standard are Jiang Yunfei, Gai Jie and Yu Longhai. 4
People's Republic of China
Mechanical Industry Standard
Welded Metal Bellows Mechanical Seal
Technical Conditions
JB/T637392
Published and distributed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry Printed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (PO Box 8144, Beijing 100081)
Copyright reserved
No reproduction allowed
Format 880×1230
Sheet 1/2
First edition in October 1992
Word count 8000
First printing in October 1992
Print run 0.001500
Price 1.20 yuan
No. 0860
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