CN112112965A - Sealing device - Google Patents
Sealing device Download PDFInfo
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- CN112112965A CN112112965A CN202010664277.XA CN202010664277A CN112112965A CN 112112965 A CN112112965 A CN 112112965A CN 202010664277 A CN202010664277 A CN 202010664277A CN 112112965 A CN112112965 A CN 112112965A
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- Prior art keywords
- sealing
- ring
- flange
- hole
- pressing
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- 238000007789 sealing Methods 0.000 title claims abstract description 346
- 238000003825 pressing Methods 0.000 claims abstract description 67
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims 8
- 230000000452 restraining effect Effects 0.000 claims 6
- 230000000694 effects Effects 0.000 abstract description 23
- 238000009434 installation Methods 0.000 abstract description 6
- 239000011148 porous material Substances 0.000 abstract description 4
- 230000009471 action Effects 0.000 description 16
- 230000000670 limiting effect Effects 0.000 description 16
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 239000000428 dust Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000013011 mating Effects 0.000 description 4
- 229910018503 SF6 Inorganic materials 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 3
- 229960000909 sulfur hexafluoride Drugs 0.000 description 3
- 229920002943 EPDM rubber Polymers 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/068—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces the packing swelling under working conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3268—Mounting of sealing rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/005—Sealing rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- Gasket Seals (AREA)
Abstract
The invention relates to a sealing device, which comprises a sealing seat, a flange sealing ring and a leak detection hole, wherein the sealing seat comprises an installation flange, and the installation flange is provided with a pressing matching surface for pressing, sealing and matching with a sealing shell; the flange sealing ring is arranged on the pressing matching surface of the mounting flange and used for keeping the mounting flange and the sealing shell sealed; the leak detection hole is arranged on the mounting flange, the orifice at one end is an inner side orifice arranged on the pressing matching surface, and the orifice at the other end is an outer side orifice used for communicating the outside; the inboard port is downstream of the at least one flange seal along a path extending progressively outwardly from the press fit surface of the mounting flange. The flange sealing ring arranged on the pressing matching surface is pressed, so that the sealing effect is good; the leak hunting pore has certain collection effect to gas, reveals gaseous detection through the leak hunting pore, receives external environment influence less, and measuring result is comparatively accurate, is convenient for monitor sealing device leakproofness through the leak hunting pore.
Description
Technical Field
The present invention relates to a sealing device.
Background
The switching-on and switching-off of the fracture structure in the arc extinguish chamber of the circuit breaker is realized by the linear reciprocating motion of an operating rod which extends out of the arc extinguish chamber under the action of an operating mechanism. In order to prevent the normal work of the circuit breaker from being influenced by the leakage of sulfur hexafluoride gas in the arc extinguishing chamber, a sealing device is arranged on the circuit breaker so as to ensure that the leakage of the sulfur hexafluoride gas cannot be caused when the operating rod moves.
The patent document of the Chinese utility model with the publication number of CN201289811Y discloses a sealing device for a high-voltage circuit breaker, which comprises a sealing plate fixed on a circuit breaker bracket, wherein a shaft hole is arranged in the middle of the sealing plate for an operating rod to pass through, a sealing group is arranged between the operating rod and the sealing plate, and the operating rod is in direct-acting sealing fit with the sealing group; the mounting contact surface on the sealing plate for mounting contact with the breaker support comprises an axially extending mating surface extending axially along the shaft hole and a radially extending mating surface extending radially along the shaft hole. And an O-shaped sealing ring is arranged at the axial extension matching surface, so that the sealing plate and the breaker support keep static sealing, and sulfur hexafluoride gas is prevented from leaking at the installation contact position along the sealing plate and the breaker support. According to the sealing device for the high-voltage circuit breaker, on one hand, the O-shaped sealing ring is arranged on the axial extension matching surface of the sealing plate, which extends along the axial direction of the shaft hole, the axial extension matching surface and the circuit breaker support do not form a compression matching effect, and the sealing effect of the O-shaped sealing ring is poor; on the other hand, when qualitative gas leakage detection is carried out, detection equipment is required to be used for detecting the outer sides of installation contact positions of the sealing plate and the breaker support, the detection position is in an open environment, the measurement process is greatly influenced by the environment, the detection structure is not high in accuracy, judgment of operators on the sealing performance of the sealing device is influenced, the circuit breaker performance is reduced easily due to sealing failure of the sealing device, even a power grid accident is caused, and power supply safety is influenced.
Disclosure of Invention
The invention aims to provide a sealing device, which can solve the technical problems that the sealing device in the prior art is poor in sealing effect, is greatly influenced by the environment during air leakage detection, and is low in detection result accuracy.
The sealing device adopts the following technical scheme:
a sealing device, comprising:
the sealing seat comprises a mounting flange, and the mounting flange is provided with a pressing matching surface for pressing, sealing and matching with the sealing shell;
the flange sealing rings are at least one and are arranged at the pressing matching surface of the mounting flange so as to keep the mounting flange and the sealing shell sealed;
the leakage detecting hole is arranged on the mounting flange, the hole opening at one end is an inner side hole opening arranged on the pressing matching surface, and the hole opening at the other end is an outer side hole opening used for being communicated with the outside;
the inboard port is downstream of the at least one flange seal along a path extending progressively outwardly from the press fit surface of the mounting flange.
Has the advantages that: according to the sealing device, the flange sealing ring is arranged on the pressing matching surface, which is in pressing sealing fit with the sealing shell, of the mounting flange, and the flange sealing ring is elastically deformed under the pressing action, so that the sealing effect is good; the sealing device is provided with the leakage detecting hole communicated with the outside and the pressing matching surface, the leakage detecting hole can detect the sealing performance of the flange sealing ring positioned at the upstream position of the orifice at the inner side of the leakage detecting hole on the path of the pressing matching surface gradually extending to the outside, the leakage detecting hole can collect part of leaked gas in a centralized manner, whether the gas is leaked or not is measured through the leakage detecting hole, the influence of the outside environment is small, the measuring result is accurate, and the sealing effectiveness of the sealing device is favorably monitored.
Further, the flange seal circle is equipped with at least two, the inboard drill way of leak hunting hole is located wherein between two flange seal circles, and sealing device includes the shutoff piece, and the shutoff piece detachable assembly is used for blockking up the leak hunting hole in the leak hunting is downthehole so that the leak hunting hole keeps sealed. The at least two flange sealing rings are arranged, the multi-stage sealing enables the pressing matching surface to have a better sealing effect, and meanwhile, the flange sealing ring on the downstream of the inner orifice can guarantee the sealing performance of the sealing device when the flange sealing ring on the upstream of the inner orifice fails, so that the sealing grade of the sealing device is further improved.
Furthermore, at least one of the flange sealing rings is a main sealing ring, at least one of the flange sealing rings is an auxiliary sealing ring, the cross-sectional area of the main sealing ring is larger than that of the auxiliary sealing ring, the main sealing ring gradually extends to the outside along the pressing matching surface on the mounting flange, and the inner side orifice of the leak detection hole is positioned at the downstream of the main sealing ring and the upstream of the auxiliary sealing ring. Through the cooperation of main sealing washer, vice sealing washer, leak hunting hole and shutoff piece, can play the detection effect to the main sealing washer that plays main sealed effect, can utilize vice sealing washer to guarantee sealing device's sealing performance again when main sealing washer became invalid, the structure sets up ingeniously, can guarantee to have better sealed effect between sealed casing and installation flange.
Furthermore, the plugging piece comprises a screw, a plugging piece sealing ring and a radial limiting ring, the plugging piece sealing ring and the radial limiting ring are sleeved on the screw, the plugging piece sealing ring is pressed and sealed with the mounting flange under the extrusion effect of the head of the screw, the radial limiting ring is provided with a limiting hole, and the plugging piece sealing ring is located in the limiting hole so as to be limited by the limiting hole. By adopting the plugging piece with the structure, the sealing ring of the plugging piece is limited by the radial size of the limiting hole, the sealing performance is poor due to the fact that the radial size is excessively expanded after the sealing ring of the plugging piece is subjected to the axial extrusion action, the sealing ring of the plugging piece is subjected to the acting force in the radial direction and the axial direction, and the sealing effect is better.
Furthermore, the leak detection holes are straight holes. The straight hole processing steps are simple, and the processing and manufacturing cost of the sealing seat is favorably reduced.
Furthermore, the seal receptacle is including being located the inboard pedestal of mounting flange, is equipped with on the pedestal to be used for making the action bars penetrate the axial hole in the seal housing, be equipped with in the axial hole to be used for with the action bars straight move seal structure of seal cooperation, straight move seal structure includes the uide bushing, the uide bushing supplies the action bars to pass and along axial hole axial direction sliding fit with the action bars for play the guide effect to the action bars in axial hole axial. The guide sleeve is arranged, so that the operating rod can move smoothly and is not easy to be blocked, and the normal movement of the operating rod is ensured.
Furthermore, an operating rod sealing ring used for keeping sealing with the operating rod is arranged on the inner wall surface of the guide sleeve, and a sealing seat sealing ring used for keeping sealing with the sealing seat is arranged on the outer wall surface of the guide sleeve. On the basis that the guide sleeve realizes the guide effect, the guide sleeve and the seat body as well as the guide sleeve and the operating rod are ensured to be sealed, the direct-acting sealing effect of the direct-acting sealing structure can be prevented from being influenced by gas from the guide sleeve, and the direct-acting sealing effect can be ensured.
Further, the seal receptacle is including being located the inboard pedestal of mounting flange, be equipped with on the pedestal and be used for making the action bars penetrate the axial hole in the seal housing, be equipped with in the axial hole and be used for with the action bars straight moving seal structure of moving seal complex, straight moving seal structure is including combination sealing ring and pressure cover, combination sealing ring includes the sealing ring, support ring and clamping ring lie in the sealing ring both sides on the axial position, the relative pedestal of support ring axial position is fixed, be equipped with the pressure cover of exerting pressure to the clamping ring on the pedestal, the pressure cover is along axial hole axial movable mounting on the pedestal, be equipped with the pressure trepanning hole that supplies the action bars to pass. Compared with an O-shaped sealing ring structure, the combined sealing ring is skillfully arranged, the inner sealing ring is extruded by the support rings and the compression rings which are positioned at two axial sides of the inner sealing ring, the compression amount of the sealing ring is uniform, and a better sealing effect can be ensured; the pressing sleeve is axially and movably connected with the base body along the axial hole, so that an operator can conveniently adjust the size of the pressure applied to the pressing ring by the pressing sleeve according to the actual use condition of the combined sealing ring, and the use process of the sealing device is flexible.
Further, the seal receptacle is including being located the inboard pedestal of mounting flange, has on the pedestal to be used for stretching into the portion of stretching into in the seal shell through the mounting hole on the seal shell, stretches into the portion and is in one side that mounting flange is used for towards the seal shell, stretches into partial periphery and is equipped with the pedestal sealing washer that is used for with the sealed complex of mounting hole pore wall on the seal shell. The sealing ring of the seat body is arranged, so that gas in the sealing shell can be prevented from escaping from the contact matching position between the wall of the mounting hole and the periphery of the extending part, and the static sealing matching grade between the sealing seat and the sealing shell is further improved.
Drawings
FIG. 1 is a schematic structural view of a sealing device according to an embodiment 1 of the present invention;
FIG. 2 is a detailed block diagram at A in FIG. 1;
in the figure: 1-installing a flange; 2-operating lever; 3-detecting leakage holes; 4-main seal ring; 5-secondary sealing ring; 6-seat body sealing ring; 7-plugging piece; 71-screws; 72-a radial confinement ring; 73-a sealing ring of the plugging member; 8-a support ring; 9-a sealing ring; 10-pressing a ring; 11-a platen; 12-pressing sleeve; 13-loosening prevention and cap removal; 14-a guide sleeve; 15-operating rod sealing ring; 16-sealing seat sealing ring; 17-a dust cap; 18-an annular step; 19-a seat body; 20-mounting flange.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Specific example 1 of the sealing device of the present invention:
the seal of the present invention is intended to be mounted on a sealed housing, as shown in figure 1. The operating rod 2 penetrates through the sealing device and extends into the sealing shell, in order to prevent gas leakage in the sealing shell when the operating rod 2 linearly reciprocates, the sealing shell is in static sealing fit with the sealing device, and the operating rod 2 is in direct dynamic sealing fit with the sealing device.
The sealing device comprises a sealing seat 1, an axial hole is formed in the sealing seat 1, and an operating rod 2 penetrates through the axial hole and extends into the sealing shell. The sealing seat 1 comprises a seat body 19 with an axial hole in the middle and a mounting flange 20 protruding outwards in the radial direction on the seat body 19, the mounting flange 20 is integrally of a circular ring structure, and a connecting hole is formed in the mounting flange 20 and used for being matched with a screw to fix the sealing seat 1 and the sealing shell. The sealing shell is provided with a mounting hole for enabling the seat body 19 to extend into the sealing shell through the mounting hole, the part of the seat body extending into the sealing shell is an extending part, and the extending part is located on one side of the mounting flange facing the sealing shell.
When the sealing device is fixedly installed with the sealing shell, the seat body 19 and the installation flange 20 are provided with sealing matching surfaces which are kept sealed with the sealing shell, and the sealing matching surfaces are provided with sealing rings, wherein the sealing rings positioned on the sealing matching surfaces on the peripheral surface of the extending part of the seat body 19 are seat body sealing rings 6, and the number of the seat body sealing rings 6 is two. The sealing mating surface on the end face of the axial end of the mounting flange 20 is in press-fit with the sealing housing, and is a press-fit mating surface. The sealing washer that compresses tightly fitting surface department and set up is flange seal, and flange seal is equipped with two, is main sealing washer 4 and secondary seal 5 respectively, and flange seal can receive the effect of compressing tightly in compressing tightly fitting surface department, can produce better sealed effect. The cross-sectional area of main seal 4 is greater than the cross-sectional area of secondary seal 5, and main seal 4 plays main sealing effect in compressing tightly fitting surface department, and main seal 4 is located secondary seal 5 radial inboard, and secondary seal 5 mainly plays supplementary sealing effect when main seal 4 became invalid, prevents that gas from revealing.
In order to detect the sealing effectiveness of the main sealing ring 4, a leakage detecting hole 3 is formed in the position between the main sealing ring 4 and the auxiliary sealing ring 5 on the compression matching surface of the mounting flange 20. The hole opening at one end of the leak detection hole 3 is arranged on the pressing matching surface on the mounting flange 20 and is an inner side hole opening; the orifice at the other end can be used for communicating the outside and is an outside orifice. The inner orifice of the leak detection hole 3 is located radially outside the primary seal ring 4 and radially inside the secondary seal ring 5. The inner opening of the leak detection bore 3 is located downstream of the primary sealing ring 4 in a path extending gradually to the outside along the press-fit engagement surface of the mounting flange 20. In the present embodiment, the leak detecting hole 3 is a through straight hole extending in a straight line.
When the main seal ring 4 became invalid, the leaked gas can enter the leak detection hole 3 along the path of the pressing fit surface gradually extending to the outside, and an operator can detect whether the leaked gas exists in the leak detection hole 3 or not outside the seal shell.
The leak detection hole 3 is provided with a plugging member 7, as shown in fig. 2, the plugging member 7 comprises a screw 71, a plugging member sealing ring 73 and a radial limiting ring 72, the screw 71 comprises a screw head part and a screw tail part, the screw tail part is provided with a thread section and a sealing section, the thread section is provided with an external thread matched with the leak detection hole in a thread way, and the sealing section is axially arranged between the thread section and the screw head part in the screw. The sealing section is sleeved with a sealing piece sealing ring 73 and a radial limiting ring 72, a limiting hole with the diameter larger than the outer diameter of the sealing piece sealing ring 73 is arranged in the middle of the radial limiting ring 72, the axial size of the radial limiting ring 72 is smaller than that of the sealing piece sealing ring 73, and the radial limiting ring 72 is located on the radial outer side of the sealing piece sealing ring 73. When the plugging member 7 is installed, the radial limiting ring 72 and the plugging member sealing ring 73 are sequentially sleeved on the screw 71, the screw 71 is screwed in the leakage detection hole through threads, the plugging member sealing ring 73 is extruded by the head of the screw along with the screwing-in of the screw 71, the external diameter of the plugging member sealing ring 73 is elastically deformed to expand, and under the radial size limiting effect of the limiting hole, the plugging member sealing ring 73 cannot generate the condition of excessive radial expansion, so that a better sealing effect can be generated.
The blanking member 7 is detachably fitted in the leakage orifice 3 and keeps the leakage orifice 3 sealed. When the leak detection hole 3 is used for detecting the sealing property of the main sealing ring, the detachable plugging piece 7 is used for measuring, the leak detection hole 3 needs to be plugged by the plugging piece 7 when the detection is completed, and the phenomenon that gas directly escapes from the leak detection hole 3 after the main sealing ring 4 fails is avoided.
In addition, when the plugging piece 7 is detached and leak detection is carried out by using the leak detection hole 3, if the main sealing ring 4 fails in sealing, gas moves outwards along the compression sealing surface on the mounting flange 20, and the auxiliary sealing ring 5 has the functions of plugging gas and gathering gas at the compression matching surface, so that the gas cannot escape and can intensively escape through the leak detection hole 3, and the detection of the leaked gas is facilitated.
The axial hole of the seat body 19 is internally provided with a direct-acting sealing structure which enables the seat body 19 and the operating rod 2 to keep direct-acting sealing, and the direct-acting sealing structure comprises a guide sleeve 14, a combined sealing ring, a pressure plate 11 and a pressure sleeve 12 which are sequentially arranged in the axial direction of the axial hole. The end face of the seat body 19 at one end in the sealing shell is the inner end face of the shell, an annular step 18 protruding inwards is arranged at one end, close to the inner end face of the shell, in the axial hole, and the guide sleeve 14 is arranged close to the annular step 18 and located on one side, far away from the inner end face of the shell, of the annular step in the axial direction. The annular step 18 acts as a stop for the guide sleeve 14. The guide sleeve 14 can be passed by the operating rod 2 and is in axial guide sliding fit with the operating rod 2 along the axial hole, and the guide sleeve 14 can play a supporting and guiding role in the linear reciprocating motion of the operating rod 2, so that the operating rod 2 can move smoothly. In order to prevent the gas from escaping through the guide sleeve 14, an operating rod sealing ring 15 which keeps sealed with the operating rod 2 is arranged on the inner wall surface of the guide sleeve 14, a sealing seat sealing ring 16 which keeps sealed with the operating rod 2 is arranged on the outer wall surface of the guide sleeve 14, and the operating rod sealing ring 15 and the sealing seat sealing ring 16 are arranged on the guide sleeve, so that the sealing between the guide sleeve 14 and the operating rod 2 and the sealing between the guide sleeve 14 and the sealing seat 1 are kept. In the present embodiment, the operating rod seal ring 15 and the seal holder seal ring 16 are made of ethylene propylene diene monomer.
The combined sealing ring is positioned on one side, far away from the annular step 18, of the guide sleeve 14 in the axial direction of the axial hole, the combined sealing ring sequentially comprises a support ring 8, a sealing ring 9 and a pressing ring 10 in the axial direction, the sealing ring 9 is a V-shaped sealing ring, and two sealing rings are arranged side by side in the axial direction of the axial hole. The support ring 8 and the pressure ring 10 axially sandwich the sealing ring 9 between them in the axial bore, the support ring 9 being arranged axially next to the guide sleeve 14 in the axial bore and its axial position being fixed relative to the seat 19. The pressing ring 10 can bear the pressure action to provide extrusion force for the sealing ring 9, so that the sealing ring 9 deforms and the operating rod 2 keeps direct-acting sealing, the combined sealing ring is an important sealing element for keeping the sealing device and the operating rod 2 in direct-acting sealing, in the embodiment, the supporting ring 9 and the pressing ring 10 are made of polytetrafluoroethylene materials, and the sealing ring 9 is made of ethylene propylene diene monomer.
The inner part of the axial hole at one end outside the sealed shell is provided with an internal thread, correspondingly, the outer peripheral surface of the pressing sleeve 12 is provided with an external thread matched with the internal thread, the pressing sleeve 12 can be axially arranged on the seat body 19 along the axial hole by screwing the threads, and the relative position of the pressing sleeve 12 and the seat body 19 in the axial direction of the axial hole can be adjusted by screwing the threads in and out. The pressing sleeve 12 is provided with a pressing sleeve hole for the operating rod 2 to pass through. The pressure sleeve 12 can provide pressure to the pressure ring 10 to deform the sealing ring 9 under the compressive force. Because the clamping ring 10 is made of polytetrafluoroethylene materials and is easily deformed by pressure of the pressing sleeve 12, a pressing plate 11 is further arranged between the combined sealing ring and the pressing sleeve 12 in the axial direction of the axial hole, the pressing plate 11 is made of metal, and a pressing plate hole for the operating rod 2 to penetrate through is formed in the pressing plate 11. The cross-sectional area of the pressing plate 11 is larger than the area of the contact part of the pressing sleeve 12 and the pressing plate 11, and the pressing plate 11 is arranged to increase the stress area of the pressing ring 10, so that the pressing ring 10 is stressed uniformly and is not easy to deform. In addition, in order to prevent the pressing sleeve 12 from loosening from the axial hole, the pressing sleeve 12 is provided with an anti-loosening cap 13 through screwing of threads, and the anti-loosening cap 13 is arranged on the pressing sleeve 12 and located on one side, facing the outside, of the mounting flange 20.
Because a gap exists between the hole wall of the pressing sleeve hole and the operating rod 2, a gap exists between the hole wall of the axial hole at the annular step 18 and the operating rod 2, and a dustproof cap 17 is arranged in the pressing sleeve hole of the pressing sleeve 12, so that external dust is prevented from entering the inside of the combined sealing ring from the pressing sleeve 12, and the sealing performance of the combined sealing ring is prevented from losing efficacy; the axial hole is also provided with a dust cap 17, and the dust cap 17 is positioned on one side of the annular step axially far away from the guide sleeve 14, so that dust in the sealing shell can be prevented from entering the sealing device from the annular step 18.
This sealing device is in the use, and operating personnel can open the shutoff piece, detects sealing device's leakproofness through leak hunting hole, if detect gaseous leakage, explains that main sealing washer is sealed inefficacy, but owing to the existence of shutoff piece and vice sealing washer, can prevent that gaseous from along compressing tightly on the route that the fitting surface outwards extended gradually and leak out in the leak hunting hole, operating personnel need change main sealing washer as soon as possible so that main sealing washer keeps encapsulated situation. If gas leakage is not detected, the sealing performance between the sealing shell and the sealing device is good, and the plugging piece is installed in the leak detection hole to enable the leak detection hole to keep sealed.
In the sealing device, the flange sealing ring is positioned on the mounting flange and is matched with the compression fitting surface of the sealing shell, and the flange sealing ring is under the action of the compression force and has a better sealing effect. Still set up the leak hunting hole that carries out qualitative detection to the leakproofness between seal housing and the sealing device among the sealing device, the leak hunting hole can be collected the gas of revealing along compressing tightly the fitting surface, it is less influenced by external environment to measure in the leak hunting hole, and the testing result is comparatively accurate, and operating personnel can know the sealed condition between seal housing and the sealing device so that make corresponding reaction according to the testing result.
Specific example 2 of the sealing device of the present invention:
different from the embodiment 1, the leakage detection device is provided with five sealing rings, wherein the five sealing rings comprise two seat body sealing rings and three flange sealing rings, the inner side orifices of the leakage detection holes are positioned on the radial outer sides of the two flange sealing rings, and the two flange sealing rings are main sealing rings for playing a main sealing role; the inner side orifice of the leak detection hole is positioned at the radial inner side of the other flange sealing ring, and the flange sealing ring is a secondary sealing ring for auxiliary sealing. The cross-sectional area of the main sealing ring is larger than that of the auxiliary sealing ring, when gas leaks from the leak detection hole, the two main sealing rings are completely out of work, and at the moment, the plugging piece and the auxiliary sealing ring can play a role in sealing to prevent the gas from leaking.
In other embodiments, there may be four, five, six, etc. multiple flange seal rings, three, four, five, etc. multiple primary seal rings, and two, three, four, etc. multiple secondary seal rings.
Specific example 3 of the sealing device of the present invention:
the difference from example 1 is: the leakage detection device is characterized in that a seat body sealing ring is not arranged, only two flange sealing rings are arranged, the two flange sealing rings comprise a main sealing ring and an auxiliary sealing ring, an inner side orifice of the leakage detection hole is located between the main sealing ring and the auxiliary sealing ring, and the cross sectional area of the main sealing ring is larger than that of the auxiliary sealing ring.
Specific example 4 of the sealing device of the present invention:
the difference with embodiment 1 is that, the sealing washer only is equipped with one, for flange seal, when flange seal became invalid, gaseous can outwards reveal through compressing tightly the fitting surface, does not set up the shutoff piece in the leak hunting hole, when going on leak hunting at every turn, need not to open the shutoff piece, can directly go on leak hunting.
Specific example 5 of the sealing device of the present invention:
different from the embodiment 1, the plugging piece is an elastic pin which is in interference fit with the leak detection hole so as to ensure the leak detection hole to be sealed.
Specific example 6 of the sealing device of the present invention:
different from the embodiment 1, the guide sleeve is not arranged in the axial hole, the inner wall of the axial hole at the annular step is in axial sliding fit with the operating rod in the axial hole, the support ring of the combined seal ring is arranged close to the annular step, the support ring is arranged at one side of the annular step, which is axially far away from the inner end face of the shell, of the axial hole, and the annular step plays a role in stopping the support ring.
Specific example 7 of the sealing device of the present invention:
unlike embodiment 1, the operating rod seal ring and the seal holder seal ring are not provided on the guide sleeve.
Specific example 8 of the sealing device of the present invention:
different from the embodiment 1, a combined sealing ring is not arranged between the sealing seat and the operating rod, an O-shaped sealing ring is arranged between the pressure plate and the guide sleeve at the axial position, and the pressure sleeve extrudes the O-shaped sealing ring through the pressure plate to enable the O-shaped sealing ring to deform and be in direct-acting sealing with the operating rod.
Specific example 9 of the sealing device of the present invention:
different from the embodiment 1, one axial end of the seat body, which is positioned outside the sealing shell, is provided with a radial hole, the radial hole is a through hole, the pressing sleeve is provided with a long round hole, the length direction of the long round hole extends along the axial direction of the axial hole, the elastic pin is sequentially inserted into the radial hole and the long round hole, the pressing sleeve is fixedly arranged on the seat body, and the axial relative positions of the seat body and the pressing sleeve in the axial hole can be changed by moving the position of the elastic pin in the long round hole.
Specific example 10 of the sealing device of the present invention:
different from the embodiment 1, the leakage detecting hole is a hole with a central axis extending in a bending way, an inner side orifice at one end of the leakage detecting hole is positioned between the main sealing ring and the auxiliary sealing ring, and an outer side orifice at one end of the leakage detecting hole is positioned on the mounting flange and is communicated with the outside.
Specific example 11 of the sealing device of the present invention:
in contrast to example 1, the two flange seals have the same cross-sectional area.
Specific example 12 of the sealing device of the present invention:
the difference with embodiment 1 is that the seal receptacle is the plate-type structure, is equipped with on the seal receptacle and installs the mounting flange on sealed casing through the bolt, and mounting flange is the ring shape structure. The opening on the sealing shell is sealed, the size of the sealing seat is larger than that of the opening, a pressing matching surface in sealing fit with the sealing shell is arranged on the sealing seat, and the pressing matching surface is an annular surface.
A flange sealing ring is arranged at the position of the pressing matching surface, and the opening on the sealing shell is positioned on the radial inner side of the flange sealing ring. The leak detection hole is arranged on the sealing seat and is a straight hole, the orifice at one end of the leak detection hole is arranged on the compression fitting surface and is an inner orifice, the inner orifice is positioned on the radial outer side of the flange sealing ring, and the orifice at the other end is communicated with the outside and is an outer orifice. The leak detection hole can be used for detecting the sealing effectiveness of the flange sealing ring.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (9)
1. A sealing device, comprising:
the sealing seat comprises a mounting flange, and the mounting flange is provided with a pressing matching surface for pressing, sealing and matching with the sealing shell;
the flange sealing rings are at least one and are arranged at the pressing matching surface of the mounting flange so as to keep the mounting flange and the sealing shell sealed;
the leakage detecting hole is arranged on the mounting flange, the hole opening at one end is an inner side hole opening arranged on the pressing matching surface, and the hole opening at the other end is an outer side hole opening used for being communicated with the outside;
the inboard port is downstream of the at least one flange seal along a path extending progressively outwardly from the press fit surface of the mounting flange.
2. A sealing device as claimed in claim 1, wherein there are at least two flange seals, and the inner port of the leak-checking hole is located between two of the flange seals, the sealing device comprising a blocking member which is detachably mounted in the leak-checking hole for blocking the leak-checking hole to keep it sealed.
3. A sealing arrangement as claimed in claim 2, wherein at least one of the flange seals is a primary seal and at least one is a secondary seal, the primary seal having a cross-sectional area greater than the cross-sectional area of the secondary seal along a path extending progressively outwardly of the press-fit engagement surface of the mounting flange, and the inner orifice of the leak-checking bore is located downstream of the primary seal and upstream of the secondary seal.
4. A sealing arrangement as claimed in claim 2 or 3, wherein the blocking member comprises a screw, a blocking member sealing ring and a radial restraining ring, the blocking member sealing ring and the radial restraining ring are mounted on the screw, the blocking member sealing ring is pressed against the mounting flange under compression of the head of the screw, the radial restraining ring is provided with a restraining aperture, and the blocking member sealing ring is located in the restraining aperture such that the blocking member sealing ring is restrained by the restraining aperture.
5. A sealing device according to any of claims 1-3, wherein the leak detection orifice is a straight orifice.
6. A sealing device as claimed in any one of claims 1 to 3, wherein the sealing seat comprises a seat body located inside the mounting flange, the seat body being provided with an axial hole for the operating rod to pass through in the sealing housing, the axial hole being provided with a direct acting sealing structure for direct acting sealing engagement with the operating rod, the direct acting sealing structure comprising a guide sleeve for the operating rod to pass through and for axially guiding sliding engagement with the operating rod along the axial hole for guiding the operating rod in the axial direction of the axial hole.
7. The sealing device as claimed in claim 6, wherein the guide sleeve is provided on an inner wall surface thereof with a lever seal ring for maintaining a seal with the lever, and the guide sleeve is provided on an outer wall surface thereof with a seal seat seal ring for maintaining a seal with the seal seat.
8. A sealing device as claimed in any one of claims 1 to 3, characterized in that the sealing seat comprises a seat body located inside the mounting flange, the seat body is provided with an axial hole for the operating rod to penetrate into the sealing housing, a direct-acting sealing structure for direct-acting sealing engagement with the operating rod is provided in the axial hole, the direct-acting sealing structure comprises a combined sealing ring and a pressing sleeve, the combined sealing ring comprises a sealing ring, a support ring and a pressing ring, the support ring and the pressing ring are located on two sides of the sealing ring at an axial position, the axial position of the support ring is fixed relative to the seat body, the seat body is provided with the pressing sleeve for applying pressure to the pressing ring, the pressing sleeve is axially movably mounted on the seat body along the axial hole, and the.
9. A sealing arrangement as claimed in any one of claims 1 to 3, wherein the sealing mount comprises a mounting body located inwardly of the mounting flange, the mounting body having an extension portion for extending into the sealing housing through the mounting aperture in the sealing housing, the extension portion being located on the side of the mounting flange which is intended to face the sealing housing, the extension portion being provided at its periphery with a mounting ring for sealing engagement with the wall of the mounting aperture in the sealing housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664277.XA CN112112965A (en) | 2020-07-10 | 2020-07-10 | Sealing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664277.XA CN112112965A (en) | 2020-07-10 | 2020-07-10 | Sealing device |
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| CN112112965A true CN112112965A (en) | 2020-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010664277.XA Pending CN112112965A (en) | 2020-07-10 | 2020-07-10 | Sealing device |
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| CN114810674A (en) * | 2022-06-30 | 2022-07-29 | 四川绵竹川润化工有限公司 | Sealed liquid ammonia pump for liquid ammonia transportation |
| CN115026602A (en) * | 2022-06-08 | 2022-09-09 | 国家石油天然气管网集团有限公司 | Main shaft double-seal structure suitable for tapping machine |
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Application publication date: 20201222 |