CN2172377Y - Butterfly sealing ring - Google Patents

Abstract

The utility model provides a butterfly sealing ring, which is characterized in that the axial longitudinal section of the butterfly sealing ring is in the shape of a parallelogram. The half angle of the cone apex angle (alpha) thereof is less than 90 DEG, the ratio of the outer diameter and the internal diameter is 1.25 < = D / D < = 3.5, and the cone bottom angle (theta) is from 15 to 25 DEG.. The ratio of the height of the butterfly sealing ring and the thickness of a disc piece is h/s=*. The utility model can be used as the sealing of a vertical cylinder face parallel to the axial direction of the butterfly sealing ring. The utility model has the advantages of good sealing effect, no damage to the sealing surface and repeated use and is mainly used for the mechanical sealing for a temperature measuring device in a nuclear power station for a pressurized-water reactor.

Description

Butterfly sealing ring

The utility model relates to a kind of seal element, is a kind of disc sealing ring specifically.

Disc sealing ring is a kind of novel seal element, has advantages such as good seal performance, easy accessibility and is used in the relevant seal arrangement of pressurized water reactor pressurized container.At present, used disc sealing ring as shown in Figure 4 in Japan's atomic pile container upper sealing device, the axial longitudinal section that is characterized in disc sealing ring is a rectangle, the position rectangle that is used to seal, following two drift angles, when disc sealing ring is added thrust load, make, following drift angle and sealed upper thread contact seal, sealing surface be with disc sealing ring axially vertical on, following two annular end faces, this kind seal ring is not suitable for the sealing with the vertical cylndrical surface of seal ring parallel to an axis, and on, two annular end faces are sealing surface down, it is again the pressure-bearing surface that seal ring is applied thrust load, thrust load is exactly a seal load, simultaneously sealing surface is in and the axial vertical orientations of seal ring, also deposits foreign matter easily in installation and operation, makes to destroy sealing surface when loading and cause and leak and influence sealed working life.

It is vertical cylndrical surface that the purpose of this utility model provides a kind of sealing surface, the disc sealing ring of good seal performance.

A kind of disc sealing ring provided by the utility model, its axial longitudinal section is a parallelogram, and half-angle α＜90 of its cone-apex angle °, its outer diameter D and inner diameter d ratio are 1.25≤D/d≤3.5, its awl base angle θ is 15 °～25 °, and truncated cone height h is h/s=with video disc thickness s ratio in the video disc of disc sealing ring $\sqrt{2}$ 。

The axial longitudinal section of seal ring is a parallelogram in the utility model, the position that is used to seal is two minor faces of parallelogram, when it is applied thrust load, sealing strip is parallel four limit row, two minor faces and sealed cylindrical arrowband that is contacted, what match mutually with it is vertical cylndrical surface with the seal ring parallel to an axis, can satisfy the sealing needs of certain specific device, and vertically cylindrical seal is difficult for the deposition foreign matter when installation and operation, can be when not loading foreign matter destroy sealing surface and cause leakage, sealing surface is with axially loading surface is orthogonal, help control sealing pretightening force, there is the tan relation between sealing contact force and axial the loading, so when less axial loading, just can realize sealing, the sealing surface of pairing is the cylndrical surface that is parallel to each other mutually, the contact width and the degree of depth are big when making the sealing pretension, help sealing, and the impression of having avoided seal ring tip in the prior art that the embedding infringement of sealed parts surface is caused, impression or pressure ditch, thereby prolonged the working life of institute's sealed member, improved the reliability of reusing seal ring.

Now in conjunction with the accompanying drawings and embodiments the utility model is described specifically:

Fig. 1 is a kind of disc sealing ring structural representation provided by the utility model;

Fig. 2 is the axial semi-section schematic representation of a kind of disc sealing ring provided by the utility model;

Fig. 3 is a kind of disc sealing ring load-deflection curve provided by the utility model, and wherein y coordinate P represents resistance of deformation, and abscissa f represents the disc sealing ring decrement;

Fig. 4 is the axial semi-section schematic representation of known Japanese disc sealing ring.

As depicted in figs. 1 and 2, a kind of disc sealing ring provided by the utility model, its axial longitudinal section parallelogram, half-angle α＜90 of cone-apex angle °, the external diameter of disc sealing ring is D(mm), internal diameter is d(mm), external diameter is 1.25≤D/d≤3.5 with the internal diameter ratio, and is too small as the D/d value, make difficulty, excessive, then the rigidity of seal ring is too small, and the boundary dimension of sealing configuration can be very big; The awl base angle θ of disc sealing ring is 15 °～25 °, when disc sealing ring is subjected to axial compression, under same decrement, in it, the variation of external diameter is relevant with taper angle theta, θ hour, in, external diameter is little with the variance ratio of decrement, otherwise then big, but under the identical situation of decrement, when θ is big, it is high that the stress level at disc sealing ring edge is wanted relatively, and the disc sealing ring that the rigidity of while disc sealing ring and resistance of deformation are all little than θ is big, as θ too hour, disc sealing ring rigidity is too small, and the ring in, external diameter resilience contour projector is also little, is unfavorable for mounting or dismounting, in addition, θ chooses, also should consider the power that causes by interior pressure and the relation between axial pre tightening force and the initial sealing specific pressure, avoid producing at the edge of disc sealing ring heavily stressed, θ in the present embodiment=90 °-α=20 °; The truncated cone height is h(mm in the video disc of disc sealing ring), video disc thickness is 5(mm), their ratio h/s= $\sqrt{2}$ This disc sealing ring is in the limited compression zone of sealing configuration, its resistance of deformation when sealing resistance of deformation calculating, can think that the resistance of deformation of disc sealing ring keeps the constant (see figure 3) of pc value always less than certain specific pc value in whole pretension process.The utility model is made by stainless steel, not only can bear high temperature, high pressure, and corrosion-resistant, anti-irradiation, can also bear bigger pressure surge, and shock-absorbing performance is good, long service life.The utility model is mainly used in the mechanical seal of pressurized-water reactor nuclear power plant temperature measuring equipment, it is the vertical sealing between thermocouple silicone core bundling tube and flange, when disc sealing ring is subjected to axially loading compressive strain, its external diameter is increased, internal diameter reduces, thereby when having clogged owing to manufacturing and assembling, flange and disc sealing ring, the gap of being stayed between disc sealing ring and the silicone core bundling tube, when the suffered axle power of disc sealing ring continues to increase, its internal diameter and external diameter continue to change, up to the outer round surface and the flange internal circular surfaces of disc sealing ring, and the internal circular surfaces of disc sealing ring contacts with the silicone core bundling tube outer round surface, and forms an airtight Line of contact in the contact position, under the effect of sealing prefastening load, small resiliently deformable will take place in the part of Line of contact, and the trickle injustice between further then fill plug seal face obtains good sealing effect.

Claims (2)

1, a kind of disc sealing ring, the axial longitudinal section parallelogram that it is characterized in that disc sealing ring, and half-angle α＜90 of its cone-apex angle °, the ratio of its outer diameter D and inner diameter d is 1.25≤D/d≤3.5, its awl base angle θ is 15 °～25 °, and truncated cone height h and video disc thickness s are than being h/s=in the disc sealing ring video disc $\sqrt{2}$ 。

2,, it is characterized in that said awl base angle θ=20 ° according to the said a kind of disc sealing ring of claim 1.

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