U-ring to stretch and close to the sealed surface to achieve sealing, as shown in
Fig. 9.2. The elastic force of O-ring in the sealing structure acts on the inner lip of
U-ring to provide low-pressure sealing force. High-pressure sealing pressure is
provided by fluid. Figure 9.3 is the schematic diagram of O-ring seal.
9.1.2.2 Characteristics of O-Ring Seal
(1) It has a simple structure and good reliability.
(2) Low price, economical and practical, and mass production can ensure mass
supply.
(3) It can compensate the radial runout within the allowable range.
(4) It can be sealed in all directions (radial, axial, or along any angle).
(5) Wide applicability. Suitable for all types of sealing applications (face seal,
radial seal, static seal, and dynamic seal).
(6) It can be used repeatedly in the limit working range (pressure, temperature,
speed, and cycle).
(7) No protective coating is required.
(8) Material can be selected according to application.
(9) Easy to install, usually without special tools.
(10) No tightening is required.
9.1.2.3 O-Ring Material
O-rings are usually made of elastic natural rubber or synthetic rubber. Synthetic
rubber is cured by a combination of chemical ingredients. Ingredients are generally
classified as follows: polymer (elastomer); inert filler (carbon black or mineral
filler); reinforcing agent; catalyst, activator, retarder, and curing agent;
anti-degradation agent; plasticizer; process aids for accelerating molding; special
additives (pigments, flame retardants, etc.).
Synthetic rubber materials suitable for engineering application can be made by
selecting specific ingredient combinations and proportions. At present, there are
more than ten kinds of rubber materials widely used, and each material can have
different formulations and proportions, so the characteristics of the material are
different. The properties and characteristics of these rubber materials are summarized below.
Fig. 9.2 O-ring radial
combined seal
60
9 High-Temperature and High-Speed Gas Turbine Pump …
Fig. 9.2. The elastic force of O-ring in the sealing structure acts on the inner lip of
U-ring to provide low-pressure sealing force. High-pressure sealing pressure is
provided by fluid. Figure 9.3 is the schematic diagram of O-ring seal.
9.1.2.2 Characteristics of O-Ring Seal
(1) It has a simple structure and good reliability.
(2) Low price, economical and practical, and mass production can ensure mass
supply.
(3) It can compensate the radial runout within the allowable range.
(4) It can be sealed in all directions (radial, axial, or along any angle).
(5) Wide applicability. Suitable for all types of sealing applications (face seal,
radial seal, static seal, and dynamic seal).
(6) It can be used repeatedly in the limit working range (pressure, temperature,
speed, and cycle).
(7) No protective coating is required.
(8) Material can be selected according to application.
(9) Easy to install, usually without special tools.
(10) No tightening is required.
9.1.2.3 O-Ring Material
O-rings are usually made of elastic natural rubber or synthetic rubber. Synthetic
rubber is cured by a combination of chemical ingredients. Ingredients are generally
classified as follows: polymer (elastomer); inert filler (carbon black or mineral
filler); reinforcing agent; catalyst, activator, retarder, and curing agent;
anti-degradation agent; plasticizer; process aids for accelerating molding; special
additives (pigments, flame retardants, etc.).
Synthetic rubber materials suitable for engineering application can be made by
selecting specific ingredient combinations and proportions. At present, there are
more than ten kinds of rubber materials widely used, and each material can have
different formulations and proportions, so the characteristics of the material are
different. The properties and characteristics of these rubber materials are summarized below.
Fig. 9.2 O-ring radial
combined seal
60
9 High-Temperature and High-Speed Gas Turbine Pump …