Background technology
Sealing ring is widely used in all trades and professions as a kind of conventional machinery part, primarily serves the effect of liquidproof or gas leakage prevention。
Use in environment at ultralow temperature, the molecular permeability of usual cryogenic media is strong more than room temperature medium, it is easier to reveal, therefore the requirement of sealing ring is significantly high, prior art many employings spring energy-storage seals, the profile of tooth of its liner V-arrangement spring is rectangle, spring shape and be bent into circular after, the slot meeting natural extension of external diameter direction, inner ring direction slot can reduce by nature, external diameter direction becomes big due to slot, the sealing force that chuck is provided also can reduce accordingly, and owing to slot becomes big, the stretch compensation seriality of chuck can be weakened by cycle spring accordingly, sealing effectiveness is weakened。
Therefore, complexity day by day along with working condition, sealing ring be it is also proposed more harsh conditions, common rubber seal is easily aging due to material, and the impact by high temperature or low temperature is relatively larger, be not suitable for the complicated occasion such as perishable, high temperature or low temperature, it is therefore necessary to adopt the sealing ring that a kind of applicable complex working condition uses。
Summary of the invention
The invention provides a kind of ultralow temperature sealing ring, it is possible under the environment of ultralow temperature, machinery or equipment are carried out good sealing, by the structure of double; two arc lips, it is possible to play good double sealing effect when stress, improve the sealing property of sealing ring。
The invention provides a kind of ultralow temperature sealing ring, including: lip circle body and metal elastic part, lip circle body includes: epipharynx and outer lip, annular recess it is provided with between epipharynx and outer lip, metal elastic part is arranged in annular recess, epipharynx and outer lip deviate from the side of annular recess and are respectively equipped with primary seal lip and time sealing lip, and primary seal lip is integrally formed with epipharynx and outer lip with secondary sealing lip, and primary seal lip is shaped as arc with time sealing lip。
Further, metal elastic part is multiple elastomeric elements being processed into the annular that the V-shaped spring leaf in cross section is formed by fixedly connecting by flat wire by mould, the size of metal elastic part and annular recess match, the boss for engaging metal elastic part it is provided with in annular recess, the closed end of metal elastic part is fitted with the bottom of annular recess, and the opening of metal elastic part is fitted with boss。
Further, spring leaf is provided with the multiple external tooths and multiple internal tooth that are stamped to form, external tooth be shaped as rectangle, internal tooth be shaped as V-arrangement, the opening size of internal tooth is more than the opening size of external tooth。
Further, being provided with the groove of cushioning effect between primary seal lip and secondary sealing lip, the height of primary seal lip is more than the height of secondary sealing lip。
Further, metal elastic part is made up of stainless steel material。
Further, lip circle body is made up of polytetrafluoroethylmaterial material。
The invention provides a kind of ultralow temperature sealing ring, it has the beneficial effects that: can under the environment of ultralow temperature, machinery or equipment are carried out good sealing, structure by double, two arc lips, good double sealing effect can be played when stress, improve the sealing property of sealing ring, internal tooth and the difformity of external tooth in spring leaf can so that strengthening seriality and the uniformity of load when connecting cyclization, groove between primary seal lip and secondary sealing lip can cushion the pressure being likely to leak out from primary seal lip, avoid because time sealing lip is directly impacted in the leakage at primary seal lip place。
Accompanying drawing explanation
Fig. 1 is the sectional view of ultralow temperature sealing ring provided by the invention；
Fig. 2 is the scheme of installation of ultralow temperature sealing ring provided by the invention；
Fig. 3 is the structural representation of spring leaf in prior art；
Fig. 4 is the structural representation of technology elastomeric element in prior art；
Fig. 5 is the structural representation of the spring leaf of ultralow temperature sealing ring provided by the invention；
Fig. 6 is the structural representation of the metal elastic part of ultralow temperature sealing ring provided by the invention；
In figure: 1, lip circle body；2, metal elastic part；11, epipharynx；12, outer lip；13, annular recess；14, primary seal lip；15, secondary sealing lip；21, spring leaf；131, boss；211, external tooth；212, internal tooth；3, groove。
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details:
According to Fig. 1, the invention provides a kind of ultralow temperature sealing ring, including: lip circle body 1 and metal elastic part 2, lip circle body 1 includes: epipharynx 11 and outer lip 12, annular recess 13 it is provided with between epipharynx 11 and outer lip 12, metal elastic part 2 is arranged in annular recess 13, epipharynx 11 and outer lip 12 deviate from the side of annular recess 13 and are respectively equipped with primary seal lip 14 and time sealing lip 15, primary seal lip 14 and time sealing lip 15 are integrally formed with epipharynx 11 and outer lip 12, primary seal lip 14 is shaped as arc with time sealing lip 15, the sealing principle of above-mentioned ultralow temperature sealing ring is: metal elastic part 2 provides elastic force on epipharynx 11 and outer lip 12 near the lip wall of annular recess 13 side, primary seal lip 14 and time sealing lip 15 is forced tightly to be attached to by the surface of sealing member, thus blocking medium to form sealing, pass through said structure, can be implemented under the environment of ultralow temperature, machinery or equipment are carried out good sealing, structure by double, two arc lips, good double sealing effect can be played when stress, improve the sealing property of sealing ring, the environment of ultralow temperature is typically under subzero 100 DEG C, medium permeability under this condition will far above room temperature medium, so that the good sealing ring of sealing effectiveness, primary seal lip 14 and time sealing lip 15 be shaped as arc ensure that primary seal lip 14 and time sealing lip 15 when pressurized with by seal configuration position all the time all circular arc arbitrarily tangential on, avoid because primary seal lip 14 can not cause seal failure with being contacted by sealing member effectively with time sealing lip 15。
According to Fig. 2, when system pressure is relatively low, the active force of metal elastic part 2 acts on primary seal lip 14 and time sealing lip 15, now rely only on metal elastic part 2 to seal by sealing member, and when system pressure gradually steps up, medium can enter annular recess 13 under the effect of the pressure, pressure medium and the active force combined effect of metal elastic part 2 are in primary seal lip 14 and secondary sealing lip 15, now sealing ring relies on medium and metal elastic part 2 jointly to seal by sealing member, as shown in Figure 2, medium can enter in annular recess 13 from the passage in the left side of sealing ring。
Preferably, metal elastic part 2 is multiple elastomeric elements being processed into the annular that the V-shaped spring leaf in cross section 21 is formed by fixedly connecting by flat wire by mould, the size of metal elastic part 2 and annular recess 13 match, the boss 131 for engaging metal elastic part 2 it is provided with in annular recess 13, fit in the bottom of the closed end of metal elastic part 2 and annular recess 13, the opening of metal elastic part 2 and boss 131 are fitted, spring leaf 21 is provided with the multiple external tooths 211 and multiple internal tooth 212 that are stamped to form, external tooth 211 be shaped as rectangle, internal tooth 212 be shaped as V-arrangement, the opening size of internal tooth 212 is more than the opening size of external tooth 211。
Compared with prior art, molding mode and the prior art of the spring leaf 21 in ultralow temperature sealing ring provided by the invention are just the same, simply rushing the difference to some extent in shape of tooth, in prior art, internal tooth 212 and the shape of external tooth 211 on spring leaf 21 are rectangle, and size is consistent, concrete structure can referring to Fig. 3, when adopting the spring leaf 21 of this structure, spring leaf 21 molding and bending again through welding manner be in turn connected into circular after, the slot meeting natural extension of external diameter direction, internal diameter direction slot can reduce by nature, external diameter direction becomes big due to slot, the active force that primary seal lip 14 and time sealing lip 15 are provided also can reduce accordingly, and owing to slot becomes big, the stretch compensation seriality of epipharynx 11 and outer lip 12 can be weakened by metal elastic part 2 accordingly, sealing effectiveness is weakened, and internal diameter direction slot cannot infinitely reduce, overlap or overlap joint can be caused, thus affecting sealing effectiveness, concrete structure can referring to Fig. 4, and spring leaf 21 structure in ultralow temperature sealing ring provided by the invention is that internal tooth 212 is different with the shape of external tooth 211, internal tooth 212 be shaped as V-arrangement, external tooth 211 be shaped as rectangle, the opening size of internal tooth 212 is greater than the opening size of external tooth 211, and the opening size of external tooth 211 is also less than external tooth 211 opening size of spring leaf 21 of the prior art, concrete structure may refer to Fig. 5, when adopting the spring leaf 21 of this structure, spring leaf 21 molding and bending again through welding manner be in turn connected into circular after, the slot formed after the slot natural extension of external diameter direction can be less compared to external diameter direction of the prior art slot, and internal diameter direction slot is owing to adopting v-shaped structure, will not overlap or overlap, thus the seriality of proof load and uniformity are higher than the metal elastic part 2 of prior art, concrete structure may refer to Fig. 6。
Preferably, the groove 3 of cushioning effect it has been provided with between primary seal lip 14 and secondary sealing lip 15, the height of primary seal lip 14 is more than the height of secondary sealing lip 15, the height of primary seal lip 14 is higher than time sealing lip 15, ensure primary seal lip 14 and time sealing lip 15 and can be fitted tightly by sealing member, avoid influencing each other because of highly different reasons, the groove 3 being provided with between primary seal lip 14 and secondary sealing lip 15 can cushion the pressure being likely to leak out from primary seal lip 14, avoid because time sealing lip 15 is directly impacted in the leakage at primary seal lip 14 place, primary seal lip 14 and time sealing lip 15 position is directly acted on due to metal elastic part 2, and to cause primary seal lip 14 to compare time sealing lip 15 arc with the difference of time sealing lip 15 height bigger due to primary seal lip 14, such that it is able to alleviate the deformation causing primary seal lip 14 and time sealing lip 15 because of metal elastic part 2 and pressure medium combined effect。
Preferably, metal elastic part 2 is made up of stainless steel material, and stainless steel material corrosion resistance is better, and ensure that consistency and elasticity requirement, it is possible to select the stainless steel material of the models such as SS301 or 718。
Preferably, lip circle body 1 is made up of polytetrafluoroethylmaterial material, polytetrafluoroethylmaterial material has good resistance to wearing and heat resistance, relatively low gas permeability, and low-temperature characteristics is better, being highly suitable for the sealing of ultra-low temperature surroundings, the material of certain above-mentioned lip circle body 1 can also select other high molecular polymer such as polytrifluorochloroethylene or ultra high molecular polyethylene, it may have identical characteristic。
In sum, the invention provides a kind of ultralow temperature sealing ring, it is advantageous that: can under the environment of ultralow temperature, machinery or equipment are carried out good sealing, structure by double, two arc lips, good double sealing effect can be played when stress, improve the sealing property of sealing ring, internal tooth and the difformity of external tooth in spring leaf can so that strengthening seriality and the uniformity of load when connecting cyclization, groove between primary seal lip and secondary sealing lip can cushion the pressure being likely to leak out from primary seal lip, avoid because time sealing lip is directly impacted in the leakage at primary seal lip place, metal elastic part is made up of stainless steel material can anticorrosion, and lip circle body adopts polytetrafluoroethylmaterial material can strengthen sealing effectiveness, it is highly suitable for ultra-low temperature surroundings, present configuration is simple, designed by the spring of double containment lip and special construction, drastically increase the sealing effectiveness of sealing ring, it is a practicality and functional stronger ultralow temperature sealing ring。
The above; it is only presently preferred embodiments of the present invention; not in order to limit the present invention, every any trickle amendment, equivalent replacement and improvement above example made according to the technical spirit of the present invention, should be included within the protection domain of technical solution of the present invention。