CN111706529B

CN111706529B - Coaxial double-blade gas isolation sealing device

Info

Publication number: CN111706529B
Application number: CN202010379834.3A
Authority: CN
Inventors: 葛亮
Original assignee: Suzhou Maxu Automation Technology Co ltd
Current assignee: Suzhou maxu Automation Technology Co.,Ltd.
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2021-06-29
Anticipated expiration: 2039-08-20
Also published as: CN111706529A; CN111706530A; CN110425286B; CN110425286A; CN111706530B

Abstract

The invention discloses a coaxial double-blade gas isolation sealing device which comprises a main shaft, a sealing wheel, a sealing cover and a shell, wherein the sealing cover is arranged at the end part of the shell, the main shaft penetrates through the sealing cover and is connected with external rotation drive, the sealing wheel is sleeved on the main shaft and is positioned in the sealing cover, the sealing wheel comprises a wheel body, outer ring blades and inner ring blades, the outer ring blades and the inner ring blades are both arranged on one side end surface of the wheel body facing the sealing cover, the outer ring blades and the inner ring blades are annularly distributed and take the main shaft as the center, after the outer ring blades and the inner ring blades are driven by the main shaft to rotate, the outer ring blades are used for centrifugal pumping, the inner ring blades are used for radial pumping, and an O. The main shaft is vertically arranged, the sealing wheel further comprises an isolation cavity and a liquid injection hole, the sealing cover further comprises a convex ring arranged on the end face facing the sealing wheel, the convex ring is inserted into the isolation cavity, and the bottom of the convex ring is submerged by sealing liquid in a static state.

Description

Coaxial double-blade gas isolation sealing device

Technical Field

The invention relates to the field of gas sealing, in particular to a coaxial double-blade gas isolation sealing device.

Background

In many machines, seals are required, such as a stirred tank in which the mixture is not allowed to contact the air medium or the volatilized gas is not discharged to the atmosphere in large quantities, or a blower for blowing a slightly harmful gas.

The devices need to isolate medium gas in the device from the outside atmosphere, because of moving equipment, a rotating shaft is needed for doing work, the rotating power of the rotating shaft generally comes from a motor or a transmission device outside the device, the end part of the machine is bound to a rotary dynamic seal, a main shaft is directly embraced by a seal ring, and because the dynamic and static parts are in contact, the device has larger friction and larger loss power, but a large amount of heat generated by the friction cannot be timely dissipated, the local temperature rise is very large, not only a sealing gap is influenced, but also the abrasion is caused, the maintenance is frequent, a liquid seal is used, a rotating ring is inserted into an oil cavity, the contact with oil is kept while the rotating ring rotates, so that the liquid isolates gas on two sides, but the mode still has larger friction and heat, the oil liquid needs to flow and a heat exchanger is additionally arranged, and the power loss on the main shaft is also large, and the work doing efficiency is low.

Disclosure of Invention

The invention aims to provide a coaxial double-blade gas isolation sealing device to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a coaxial two-blade gas isolation sealing device, which comprises a main shaft, the sealing wheel, sealed lid and casing, sealed lid sets up at the tip of the casing, the main shaft passes sealed lid and connects outside rotary drive, the sealing wheel is established to the cover on the main shaft, the sealing wheel is located sealed lid, the sealing wheel includes the wheel body, outer loop blade and inner ring blade all set up on a side end face of the sealed lid of wheel body orientation, outer loop blade and inner ring blade become cyclic annular distribution and all use the main shaft as the center, outer loop blade and inner ring blade drive rotatory back through the main shaft, outer loop blade centrifugal pump gas, inner ring blade centripetal pump gas, set up O type circle on the contact surface of wheel body and main.

This sealing device uses on the stirred tank that has sealed demand for example, or transport on the fan of unconventional gas, keeps apart the medium gas in the device with outside atmosphere, and the main shaft directly uses the power shaft of equipment, and the casing is also partly of original machine, only need carry out small transformation can, process out the location tang at the casing tip during the transformation, let sealed lid accurately install just the casing, set up the sealing washer on the contact surface of sealed lid and casing and carry out static seal.

The sealing wheel is arranged on the main shaft and rotates along with the main shaft, rotary power is used as sealing power, the outer ring blade and the inner ring blade respectively blow gas to two sides, the outer ring blade blows gas to the cavity of the machine, the inner ring blade blows gas to the atmosphere side, the two parts of gas are separated at the middle position of the blades through the double-blade double-direction blowing, the outer ring blade is used for centrifugal pump gas and is similar to the blade form of a centrifugal fan, the inner ring blade needs gas to flow centripetally, so that special design is needed, the blade channel at the larger radius is narrowed, the blade channel at the smaller radius is wider, the gas can be extruded and rebounded after centrifugal motion, the windward surface of the blade is directed centripetally, the blade at the minimum radius is tangent to the inner circle, the gas flows centripetally under the double action, and the outer ring blade and the inner ring blade respectively blow gas in two directions, and an isolation belt is generated at the junction, so that the dynamic sealing effect is achieved. Certainly, the sealing force of the dynamic seal is not very large, different sealing forces can be obtained by arranging sealing wheels with different sizes, but the sealing forces cannot be infinitely increased, so that the device is applied to a normal-pressure or micro-pressure closed stirring kettle or a fan.

Furthermore, the blade height of the outer ring blades is gradually changed, one side of the outer ring blades, which is close to the inner ring blades, is lower than one side of the outer ring blades, which is far away from the inner ring blades, the blade height of the inner ring blades is gradually changed, and one side of the inner ring blades, which is close to the outer ring blades, is lower than one side of the outer ring blades, which is far away from the outer ring blades; the blade upper edges of the outer ring blades and the inner ring blades are also obliquely arranged, the blade upper edges of the outer ring blades and the inner ring blades are all concave to the positions between the blades, the inner surface end face, facing the sealing wheel, of the sealing cover is provided with an inclined surface, and the inclined surface is matched with the blade upper edges of the outer ring blades and the inner ring blades in inclination degree.

The heights of the blades of the outer ring blade and the inner ring blade are gradually changed, the sides far away from each other are higher, and the sides close to each other are lower, so that a channel with gradually changed area is formed on the flow channel again, the area of the channel at the outlet end of each blade is large, and the area of the channel at one end close to the isolation belt is small, so that gas is more difficult to reach the isolation belt, and the sealing effect is enhanced; the inclined plane and the inclined upper edge of the blade are arranged to reduce the processing difficulty of the inner and outer ring blades, if the upper edge of the blade is the same plane, the blade separation groove with gradually changed depth needs to be milled in order to achieve the purpose of gradually changing the height of the blade, and meanwhile, the blade is a curved blade, so that the difficulty is very high during milling, the inner and outer ring blades with the same blade height are firstly processed, and then the inclined plane is turned by a lathe to obtain the blade with gradually changed height, so that the processing difficulty is greatly reduced.

Furthermore, the main shaft is vertically arranged, the sealing wheel further comprises an isolation cavity and a liquid injection hole, the isolation cavity is arranged on one side, facing the sealing cover, of the wheel body, the isolation cavity comprises a slot and a containing cavity, the upper end of the slot is located on the upper end face of the wheel body and located between the outer ring blade and the inner ring blade, the containing cavity is located inside the wheel body, the containing cavity is located on the outer ring of the slot on the horizontal plane and communicated through a channel at the bottom, the liquid injection hole is radially formed in the side face of the wheel body and connected with the containing cavity, the liquid injection hole is a threaded hole, sealing liquid is injected into the isolation cavity, the sealing cover further comprises a convex ring arranged on the end face facing the sealing wheel, the convex; the side face of the sealing cover is provided with a tool hole, the axis of the tool hole and the axis of the liquid injection hole are located in the same plane, the tool hole is larger than the liquid injection hole, the liquid injection hole is plugged by a first screw plug, and the tool hole is plugged by a second screw plug.

The dynamic seal of the inner and outer ring blades can only seal when the main shaft rotates, when the machine stops and the main shaft stops, the sealing force disappears, if the inner and outer seals are still needed during the stop, an auxiliary static seal is needed, the sealing ring can be used for fully filling the gap of the main shaft penetrating through the sealing cover after the machine stops, but the mode can not be timely, and the manual operation is needed for the second time, which is troublesome. Therefore, the device is further provided with sealing liquid for sealing when the machine is stopped, and the convex ring on the inner surface of the sealing cover is submerged by the sealing liquid when the machine is stopped, so that gas in the machine and atmosphere are separated by the convex ring and cannot be contacted. The slot and the cavity are filled with some sealing liquid and are in a communicated state, when the machine runs, the main shaft rotates, the sealing liquid is thrown to the cavity due to centrifugal force, so that the liquid level in the slot is reduced, the sealing liquid is disconnected from the convex ring, the main shaft rotates smoothly, if the main shaft rotates, the sealing liquid is still contacted with the convex ring, liquid-solid static contact can be formed, the rotating resistance is high, the friction is still high, heat is generated, and the cavity is arranged to enable the static seal to be timely disengaged when the machine runs.

Annotate the liquid hole and be the external passageway of pouring into sealing liquid, after the device all assembled, annotate the liquid pipe and pass the frock hole in proper order, annotate the liquid hole and add sealing liquid toward holding the intracavity, first plug screw and second plug screw annotate liquid hole and frock hole respectively, take out for the stretching into of instrument, so the frock hole is greater than annotates the liquid hole.

As optimization, the liquid injection hole is horizontally arranged and is connected with the bottom of the containing cavity. Annotate the convenient external world in bottom that the liquid pore-interconnected located the chamber and learn the liquid level of holding intracavity sealing liquid when adding sealing liquid, can not add more, also can not add fewly, sealing liquid breaks away from the bulge loop during the machine operation, sealing liquid is the demand that sealing liquid amount was crossed the bulge loop bottom when shutting down, and annotate the liquid pore-interconnected and hold the bottom in chamber after, annotate the liquid pipe and just need use the screw thread head, need reverse slope machine slightly when taking out moreover, so that take out when annotating the liquid pipe sealing liquid can not follow and annotate the liquid hole and flow.

Preferably, the sealing wheel is in transmission connection with the main shaft. The sealing wheel can obtain rotary power from the main shaft only by means of axial abutting positioning of two sides, but slippage or unreliable transmission can be generated, and the power sealing of the inner ring blade and the outer ring blade needs higher rotating speed, so that the sealing wheel is in transmission connection with the main shaft to ensure that the rotation is transmitted to the sealing wheel.

As optimization, the sealing wheel and the main shaft are in key transmission, a key groove is arranged in a central hole of the wheel body and is a semi-through groove, the open end of the key groove is located on the lower end face of the wheel body, a tool withdrawal groove is machined in the upper end of the key groove, an O-shaped ring groove is further arranged in the central hole of the wheel body, an O-shaped ring is located in the O-shaped ring groove, and the O-shaped ring groove is located above the key.

The key transmission is a transmission form convenient to set up, and still need set up O type circle between sealing wheel and the main shaft, the keyway can not be the full through groove, otherwise O type circle just can't seal the clearance of keyway department, so the keyway can only be half groove form, again because the assembling process of sealing wheel is from last down sheatheeing in the main shaft, shown keyway will be down, half through groove is not good at downthehole tip and is handled, so the tool withdrawal groove satisfies processing technology at tip processing one.

As optimization, the sealing wheel is positioned on the main shaft in a shaft sleeve mode and locked through threads: the sealing device further comprises a first shaft sleeve and a second shaft sleeve, the first shaft sleeve and the second shaft sleeve are sleeved on the main shaft, the first shaft sleeve and the second shaft sleeve are respectively abutted against two ends of the sealing wheel, and the shaft sleeve close to the rotary drive is pressed through a round nut screwed on the main shaft. The sealing wheel needs to be axially positioned on the main shaft, can be positioned in a mode of adding a retaining ring on a shaft shoulder and the like, and also can be in a shaft sleeve mode, a plurality of acting parts are arranged on the main shaft, the sealing wheel is one of the sealing wheel, an impeller can be arranged downwards in the fan, parts such as a stirring wheel can be arranged downwards in the stirring kettle, the shaft sleeve is added between the acting parts on the main shaft for positioning, the first part is convenient to assemble, the second part is accurate in positioning, and after two sides of all driven parts on the main shaft are pressed, all the parts cannot shake.

Preferably, the number of the tool holes and the number of the liquid injection holes are two, the two tool holes are centrosymmetric by taking the main shaft as an axis, and the two liquid injection holes are centrosymmetric by taking the main shaft as an axis. The frock hole has two respectively one to guarantee the rotation dynamic balance of sealed wheel with annotating the liquid hole, two can clear up some impurity dust of keeping apart the intracavity, because when the machine shut down, some dust in the atmosphere can drop on the inner ring blade along the clearance then fall into the isolation intracavity, slowly accumulate also can accumulate more, until because sealed effect, and the external world can regularly connect two and annotate the liquid hole, wash the isolation chamber with low-speed rivers, take away dust debris.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the blades with different shapes and different positions are arranged on one sealing wheel, when the machine runs, gas at the sealing wheel flows in two directions respectively, the gas at the outer ring flows in a centrifugal mode, the gas at the inner ring moves in a centripetal mode, and an isolation zone is formed on the boundary of the blades at the inner ring and the outer ring, so that a dynamic sealing effect is achieved; when the machine stops, the sealing liquid naturally lies down in the isolation cavity to submerge the lower edge of the convex ring, so that gas inside and outside the machine is isolated, and reliable stop seal is formed; the heights of the inner and outer ring blades are gradually changed, the blades on the sides far away from each other are high, and the blades on the sides close to each other are low, so that the blade channel leading to the isolation belt is gradually reduced in the radial direction, the thickness of the channel is also gradually reduced, the isolation effect is enhanced, and the sealing effect is improved; the double liquid injection holes and the tool holes facilitate external cleaning of the isolation cavity.

Drawings

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

FIG. 1 is a schematic view of the mounting structure of the present invention;

FIG. 2 is an axial view of the seal wheel of the present invention;

FIG. 3 is a top view of the seal wheel of the present invention with the gray areas shown as the gas flow field areas;

FIG. 4 is view A of FIG. 1 in a resting state;

FIG. 5 is view D of FIG. 4;

FIG. 6 is view B of FIG. 1;

FIG. 7 is view C of FIG. 1;

fig. 8 is view a of fig. 1 in an operating state.

In the figure: 1-main shaft, 2-sealing wheel, 21-wheel body, 22-outer ring blade, 23-inner ring blade, 24-isolation cavity, 241-isolation groove, 242-cavity, 25-liquid injection hole, 26-key groove, 27-tool withdrawal groove, 28-O-shaped ring groove, 3-sealing cover, 31-inclined surface, 32-convex ring, 33-tooling hole, 4-shell, 51-first shaft sleeve, 52-second shaft sleeve, 6-sealing liquid, 91-O-shaped ring, 92-first plug screw, 93-second plug screw and 94-round nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, a coaxial double-blade gas isolation sealing device includes a main shaft 1, a sealing wheel 2, a sealing cover 3 and a housing 4, the sealing cover 3 is disposed at an end portion of the housing 4, the main shaft 1 penetrates through the sealing cover 3 to be connected with an external rotation drive, the sealing wheel 2 is sleeved on the main shaft 1, the sealing wheel 2 is disposed in the sealing cover 3, as shown in fig. 2 and 3, the sealing wheel 2 includes a wheel body 21, outer ring blades 22 and inner ring blades 23, the outer ring blades 22 and the inner ring blades 23 are both disposed on a side end surface of the wheel body 21 facing the sealing cover 3, the outer ring blades 22 and the inner ring blades 23 are annularly distributed and both use the main shaft 1 as a center, after the outer ring blades 22 and the inner ring blades 23 are driven to rotate by the main shaft 1, the outer ring blades 22 pump gas centrifugally, the inner ring blades 23 pump gas centripetally, as shown in fig. 4 and 6, an.

The sealing device is used on a stirring kettle with sealing requirement or a fan for conveying unconventional gas, and the medium gas in the device is isolated from the external atmosphere, because the device is moved, the end part of the main shaft is necessarily related to dynamic sealing, and a sealing ring is directly used for embracing the main shaft 1 because dynamic and static different parts are contacted, so there is great friction, the loss power still can be received, but the unable in time giving off of a large amount of heats that the friction produced, local temperature rise is very big, not only influence the seal clearance, still can lead to wearing and tearing to take place, the maintenance is frequent, main shaft 1 directly uses the power shaft of equipment, casing 4 is also partly of original machine, only need carry out little transformation can, process out the location tang at 4 tip of casing during the transformation, let sealed lid 3 accurately install casing 4 just, it carries out static seal to set up the sealing washer on sealed lid 3 and casing 4's contact surface.

The sealing wheel 2 is arranged on the main shaft 1 and rotates along with the main shaft 1, the rotating power is used as the sealing power, as shown in figures 1 and 3, an outer ring blade 22 and an inner ring blade 23 respectively blow gas to two sides, the outer ring blade 22 blows gas to a machine cavity, the inner ring blade 23 blows gas to the atmosphere side, the two parts of gas are separated at the middle position of the blades through the double-blade double-direction blowing, the outer ring blade 22 is used for centrifugal pumping and is similar to the blade form of a centrifugal fan, the inner ring blade 23 needs gas to flow centripetally, so that the special design is needed, the blade channel at the larger radius is narrowed, the blade channel at the smaller radius is wider, the gas can be extruded and rebounded after centrifugal motion, the windward side of the blade is directed centripetally, as shown in figure 3, the blade at the smallest radius is tangent to the inner circle, and the gas flows centripetally under the double action, the outer ring blades 22 and the inner ring blades 23 respectively blow gas in two directions to generate isolation zones at junctions, so that a dynamic sealing effect is achieved. Certainly, the sealing force of the dynamic seal is not very large, different sealing forces can be obtained by arranging sealing wheels with different sizes, but the sealing forces cannot be infinitely increased, so that the device is applied to a normal-pressure or micro-pressure closed stirring kettle or a fan.

As shown in fig. 2 and 4, the blade height of the outer ring blades 22 is gradually changed, the blade height of the outer ring blades 22 on the side close to the inner ring blades 23 is lower than that on the side far from the inner ring blades 23, the blade height of the inner ring blades 23 is gradually changed, and the blade height of the inner ring blades 23 on the side close to the outer ring blades 22 is lower than that on the side far from the outer ring blades 22; the blade upper edges of the outer ring blades 22 and the inner ring blades 23 are also obliquely arranged, the blade upper edges of the outer ring blades 22 and the inner ring blades 23 are all recessed to the positions between the blade upper edges, the inner surface end face, facing the sealing wheel 2, of the sealing cover 3 is provided with an inclined surface 31, the inclined surface 31 is matched with the blade upper edges of the outer ring blades 22 and the inner ring blades 23 in inclination degree, and the gap between the inclined surface 31 and the blade upper edges is 0.1-0.3 mm.

The heights of the blades of the outer ring blade 22 and the inner ring blade 23 are gradually changed, the sides far away from each other are higher, and the sides close to each other are lower, so that a channel with gradually changed area is formed on the flow channel again, the channel area of the outlet end of each blade is large, and the channel area of one end close to the isolation belt is small, so that gas is more difficult to reach the isolation belt, and the sealing effect is enhanced; the inclined surface 31 and the inclined upper edge of the blade are arranged to reduce the processing difficulty of the inner and outer ring blades, if the upper edge of the blade is the same plane, the blade separation groove with gradually changed depth needs to be milled in order to achieve the purpose of gradually changing the height of the blade, and meanwhile, the blade is a curved blade, so that the difficulty is very high during milling, the inner and outer ring blades with the same blade height are firstly processed, and then the inclined surface is turned by a lathe to obtain the blade with gradually changed height, so that the processing difficulty is greatly reduced.

As shown in fig. 1, 4 and 5, the main shaft 1 is vertically arranged, the seal wheel 2 further includes an isolation chamber 24 and an injection hole 25, the isolation chamber 24 is disposed on one side of the wheel body 21 facing the seal cover 3, the isolation chamber 24 includes a slot 241 and a chamber 242, the upper end of the slot 241 is located on the upper end surface of the wheel body 21 and located between the outer ring blade 22 and the inner ring blade 23, the chamber 242 is located inside the wheel body 21, the chamber 242 is located on the outer ring of the slot 241 on the horizontal plane and communicated through a channel at the bottom, the injection hole 25 is radially disposed on the side surface of the wheel body 21, the injection hole 25 is connected with the chamber 242, the injection hole 25 is a threaded hole, the isolation chamber 24 is injected with the seal liquid 6, the seal cover 3 further includes a convex ring 32 disposed on the end surface facing the seal wheel 2, the convex ring 32 is; as shown in fig. 7, a tool hole 33 is formed in the side surface of the sealing cover 3, the axis of the tool hole 33 and the axis of the liquid injection hole 25 are located in the same plane, the tool hole 33 is larger than the liquid injection hole 25, the liquid injection hole 25 is blocked by a first screw plug 92, and the tool hole 33 is blocked by a second screw plug 93.

The dynamic seal of the inner and outer ring blades can only seal when the main shaft 1 rotates, when the machine stops and the main shaft 1 stops, the sealing force disappears, if the machine still needs the inner and outer seal when the machine stops, the auxiliary static seal is needed, the sealing ring can be used to fill the gap of the main shaft 1 passing through the sealing cover 3 after the machine stops, but the mode can not be in time, and the manual operation is needed, which is troublesome. The device is further provided with a sealing liquid 6 for sealing during the machine halt, and the convex ring 32 on the inner surface of the sealing cover 3 is submerged by the sealing liquid 6 during the machine halt, so that the gas and the atmosphere in the machine are isolated from contact by the convex ring 32. The slot 241 and the cavity 242 are filled with some sealing liquid 6 and are in a communicated state, when the machine runs, the main shaft 1 rotates, the sealing liquid 6 is thrown to the cavity 242 due to centrifugal force, so that the liquid level in the slot 241 is lowered, the sealing liquid 6 is disconnected from the convex ring 32, the main shaft 1 rotates smoothly, if the main shaft 1 rotates, the sealing liquid 6 is still contacted with the convex ring 32, liquid-solid static contact is formed, the rotation resistance is high, large friction still exists, heat is generated, and the cavity 242 is arranged to enable the static seal to be timely disconnected when the machine runs.

The liquid injection hole 25 is a passage for injecting the sealing liquid 6 from the outside, after the device is assembled, the liquid injection pipe sequentially passes through the tool hole 33 and the liquid injection hole 25 to add the sealing liquid 6 into the accommodating cavity 242, the first screw plug 92 and the second screw plug 93 respectively inject the liquid hole 25 and the tool hole 33, and the tool hole 33 is larger than the liquid injection hole 25 for the purpose of extending and extracting a tool.

As shown in FIGS. 2 and 5, the pour hole 25 is disposed horizontally, and the pour hole 25 is connected to the bottom of the container 242. Annotate the liquid hole 25 and connect the bottom of appearance chamber 242 and make things convenient for the external world to learn the liquid level of sealing liquid 6 in the appearance chamber 242 when adding sealing liquid 6, can not add more, also can not add less, sealing liquid 6 breaks away from bulge loop 32 during the machine operation, sealing liquid 6 does not cross the demand that bulge loop 32 bottom was the volume of sealing liquid 6 during the shut down, and annotate behind the bottom that liquid hole 25 connected appearance chamber 242, annotate the liquid pipe and just need use the screw thread head, and need reverse slope machine slightly when taking out, so that sealed liquid 6 can not flow out from annotating liquid hole 25 when taking out notes liquid pipe.

The sealing wheel 2 is in transmission connection with the main shaft 1. The sealing wheel 2 can obtain the rotating power from the main shaft 1 only by the axial abutting positioning of two sides, but slippage or unreliable transmission can be generated, and the power sealing of the inner ring blade and the outer ring blade needs larger rotating speed, so the transmission connection of the sealing wheel 2 and the main shaft 1 can ensure that the rotation is transmitted to the sealing wheel 2.

As shown in fig. 1 and 2, the sealing wheel 2 and the spindle 1 are driven by a key, a key groove 26 is formed in a central hole of the wheel body 21, the key groove 26 is a semi-through groove, an open end of the key groove 26 is located on a lower end surface of the wheel body 21, a relief groove 27 is formed in an upper end of the key groove 26, an O-ring groove 28 is further formed in the central hole of the wheel body 21, an O-ring 91 is located in the O-ring groove 28, and the O-ring groove 28 is located above the key.

The key transmission is a transmission form convenient to set, and because O-shaped ring 91 is required to be arranged between sealing wheel 2 and main shaft 1, keyway 26 can not be a full through groove, otherwise O-shaped ring 91 can not seal the gap at the keyway, so keyway 26 can only be a half groove form, as shown in fig. 2, and because the assembly process of sealing wheel 2 is that main shaft 1 is sleeved from top to bottom, shown keyway 26 is downward, the end part of half through groove in the hole is not well processed, so the tool withdrawal groove 27 processed at the end part meets the processing technique.

As shown in fig. 1 and 6, the sealing wheel 2 is positioned on the main shaft 1 through a shaft sleeve mode and locked through threads: the sealing device further comprises a first shaft sleeve 51 and a second shaft sleeve 52, the first shaft sleeve 51 and the second shaft sleeve 52 are sleeved on the main shaft 1, the first shaft sleeve 51 and the second shaft sleeve 52 respectively abut against two ends of the sealing wheel 2, and the shaft sleeve close to the rotary driving is pressed tightly through a round nut 94 screwed on the main shaft 1. The sealing wheel 2 needs to be axially positioned on the main shaft 1, can be positioned in a mode of adding a check ring on a shaft shoulder and the like, and also can be in a shaft sleeve mode, a plurality of acting parts are arranged on the main shaft 1, the sealing wheel 2 is one of the sealing wheel, an impeller can be arranged downwards in a fan, parts such as a stirring wheel can be downwards arranged in a stirring kettle, the shaft sleeve is added between the acting parts on the main shaft 1 for positioning, one part is convenient to assemble, the second part is accurate in positioning, and after all driven parts on the main shaft 1 are compressed, all parts cannot shake.

As shown in fig. 1, there are two tooling holes 33 and two injection holes 25, the two tooling holes 33 are centrosymmetric with the main shaft 1 as an axis, and the two injection holes 25 are centrosymmetric with the main shaft 1 as an axis. Frock hole 33 and notes liquid hole 25 have two respectively one can guarantee the rotatory dynamic balance of seal wheel 2, two can clear up some impurity dust in keeping apart the chamber 24, when the machine shuts down, some dust in the atmosphere can fall into in keeping apart the chamber 24 then on the inner ring blade 23 along the clearance, slowly accumulate also can accumulate more, until because sealed effect, and the external world can connect two periodically and annotate liquid hole 25, wash and keep apart chamber 24 with low-speed rivers, take away dust debris.

The main application principle of the device is as follows: after the machine is started, the main shaft 1 rotates, the sealing wheel 2 rotates along with the main shaft, then the outer ring blades 22 blow gas into the machine, the inner ring blades 23 blow gas to the outside atmosphere, and the middle parts of the inner ring blades and the outer ring blades form isolation belts to enable the gas on two sides to not reach, so that dynamic sealing during operation is realized. When the machine is stopped, the sealing wheel 2 stops rotating, the sealing liquid 6 in the isolation cavity 24 submerges the lower edge of the convex ring 32, and the gas inside and outside the machine cannot contact with each other, so that static sealing during the machine is realized.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A coaxial double-blade gas isolation sealing device comprises a main shaft (1), a sealing wheel (2), a sealing cover (3) and a shell (4), wherein the sealing cover (3) is arranged at the end part of the shell (4), the main shaft (1) penetrates through the sealing cover (3) to be connected with external rotation drive, the sealing wheel (2) is sleeved on the main shaft (1), the sealing wheel (2) is positioned in the cover of the sealing cover (3), and two groups of radial bending blades with opposite air guide directions are arranged on the end surface, facing the sealing cover (3), of the sealing wheel (2); the method is characterized in that: the sealing wheel (2) comprises a wheel body (21), outer ring blades (22) and inner ring blades (23), the outer ring blades (22) and the inner ring blades (23) are arranged on the end face, facing the sealing cover (3), of one side of the wheel body (21), the outer ring blades (22) and the inner ring blades (23) are distributed in an annular mode and use the spindle (1) as the center, after the outer ring blades (22) and the inner ring blades (23) are driven by the spindle (1) to rotate, the outer ring blades (22) pump air centrifugally, the inner ring blades (23) pump air centripetally, and O-shaped rings (91) are arranged on the contact surface of the wheel body (21) and the spindle (1); the blade height of the outer ring blades (22) is gradually changed, one side, close to the inner ring blades (23), of the blade height of the outer ring blades (22) is lower than one side, far away from the inner ring blades (23), of the blade height of the inner ring blades (23) is gradually changed, and one side, close to the outer ring blades (22), of the blade height of the inner ring blades (23) is lower than one side, far away from the outer ring blades (22); the blade upper edges of the outer ring blade (22) and the inner ring blade (23) are also obliquely arranged, the blade upper edges of the outer ring blade (22) and the inner ring blade (23) are recessed to positions between each other, the inner surface end face, facing the sealing wheel (2), of the sealing cover (3) is provided with an inclined surface (31), and the inclined surface (31) is matched with the blade upper edges of the outer ring blade (22) and the inner ring blade (23) in inclination degree; the main shaft (1) is vertically arranged, the sealing wheel (2) further comprises an isolation cavity (24) and a liquid injection hole (25), the isolation cavity (24) is arranged on one side, facing the sealing cover (3), of the wheel body (21), the isolation cavity (24) comprises a slot (241) and a containing cavity (242), the upper end of the slot (241) is located on the upper end face of the wheel body (21) and located between the outer ring blade (22) and the inner ring blade (23), the containing cavity (242) is located inside the wheel body (21), the containing cavity (242) is located on the outer ring of the slot (241) on the horizontal plane and communicated through a channel at the bottom, the liquid injection hole (25) is arranged on the side face of the wheel body (21) along the radial direction, the liquid injection hole (25) is connected with the containing cavity (242), the liquid injection hole (25) is a threaded hole, sealing liquid (6) is injected into the isolation cavity (24), the sealing cover (3) further comprises a convex ring, the convex ring (32) is inserted into the slot (241), and the sealing liquid (6) submerges the bottom of the convex ring (32) in a static state; a tool hole (33) is formed in the side face of the sealing cover (3), the axis of the tool hole (33) and the axis of the liquid injection hole (25) are located in the same plane, the tool hole (33) is larger than the liquid injection hole (25), the liquid injection hole (25) is blocked by a first screw plug (92), and the tool hole (33) is blocked by a second screw plug (93); the liquid injection hole (25) is horizontally arranged, and the liquid injection hole (25) is connected with the bottom of the accommodating cavity (242); the sealing wheel (2) is in transmission connection with the main shaft (1).

2. A coaxial two-bladed gas isolation seal as defined in claim 1 wherein: the sealing wheel (2) and the main shaft (1) are in key transmission, a key groove (26) is formed in a center hole of the wheel body (21), the key groove (26) is a semi-through groove, the open end of the key groove (26) is located on the lower end face of the wheel body (21), a tool withdrawal groove (27) is machined in the upper end of the key groove (26), an O-shaped ring groove (28) is further formed in the center hole of the wheel body (21), the O-shaped ring (91) is located in the O-shaped ring groove (28), and the O-shaped ring groove (28) is located above the key groove (26).