CN211606263U

CN211606263U - Vertical shielding device, shielding motor and shielding pump

Info

Publication number: CN211606263U
Application number: CN202020585077.0U
Authority: CN
Inventors: 韩杰
Original assignee: Shenyang Corrosion Resistant Alloy Pump Co ltd
Current assignee: Shenyang Corrosion Resistant Alloy Pump Co ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-09-29
Anticipated expiration: 2030-04-17

Abstract

The utility model discloses a vertical shield assembly, canned motor and canned pump, vertical shield assembly are used for sealing the axle of vertical setting, the off-axial is equipped with the shell, vertical shield assembly includes the outer stifled chamber of first end and shell sealing connection's outer gas, be equipped with the via hole between the stifled chamber of shell and outer gas, via hole department seal installation has magnetic fluid sealing device, the one end of axle is passed magnetic fluid sealing device by the shell and is inserted the stifled intracavity of outer gas, the second in outer gas stifled chamber is held and is equipped with an business turn over hole. And preferably, an air blocking protection device connected with the magnetic fluid sealing device in an air-tight manner is further arranged in the outer air blocking cavity, and the air blocking protection device is arranged outside the shaft in a surrounding manner. The structure can utilize the air plug formed in the outer air plug cavity and the air plug formed in the air plug protection device to prevent the magnetic fluid sealing device from contacting with liquid when in work, thus ensuring the working performance of magnetic fluid sealing and solving the technical problem that the existing axial sealing can not realize high efficiency and no leakage.

Description

Vertical shielding device, shielding motor and shielding pump

Technical Field

The utility model relates to an axial plane sealing technical field, concretely relates to vertical shield assembly, canned motor and canned pump.

Background

The magnetic fluid sealing technology is a novel sealing mode, which means that magnetic fluid with high saturation magnetic strength is used for sealing related mechanical equipment, the magnetic fluid seal is a zero-leakage dynamic seal, the sealing effect is very good, but the magnetic fluid seal has a defect that the magnetic fluid seal cannot be contacted with liquid, so that the magnetic fluid seal cannot be used for sealing the driving shaft of products such as a water pump, and the like, because the driving shaft of the water pump is inevitably contacted with the liquid in the water pump.

Therefore, how to design a vertical shielding device capable of sealing a driving shaft of a water pump and the like by using a magnetofluid sealing technology becomes a problem to be solved at present.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a vertical shield assembly to at least solve one of the problems that proposes among the above-mentioned background art.

To achieve the above object, the first aspect of the present invention provides a vertical shielding device.

The utility model discloses the second aspect provides a canned motor, the utility model discloses the third aspect provides a canned pump.

According to the utility model discloses technical scheme of the first aspect provides a vertical shield assembly for seal the axle of vertical setting, wherein, the off-axial is provided with the shell, vertical shield assembly includes:

the outer air blocking cavity is vertically arranged along the axial direction, the first end of the outer air blocking cavity is hermetically connected with the shell, a through hole is formed between the shell and the outer air blocking cavity, and a shaft inlet and outlet hole is formed in the second end of the outer air blocking cavity;

the magnetic fluid sealing device is arranged at the through hole and used for sealing the through hole;

one end of the shaft is positioned in the shell, and the other end of the shaft penetrates through the magnetic fluid sealing device and extends into the outer air blocking cavity.

Further preferably, the vertical shielding device further includes: the air blocking protection device is arranged in the outer air blocking cavity and is in air-tight connection with the lower end of the magnetic fluid sealing device along the axial direction, and the air blocking protection device is arranged on the outer side of the part of the shaft extending into the outer air blocking cavity in a surrounding manner; the magnetic fluid sealing device is arranged in the shell and seals the through hole, and the air blocking protection device is arranged close to the through hole and seals the through hole, so that the air blocking protection device and the magnetic fluid sealing device are in air-tight connection. Or the magnetic fluid sealing device is arranged in the air blocking cavity and seals the via hole, and the air blocking protection device is arranged at the lower end of the magnetic fluid sealing device and is fixedly connected with the magnetic fluid sealing device in a sealing way.

The inner space of the magnetic fluid sealing device is in air-tight communication with the inner space of the air blocking protection device along the axial direction. Specifically, the internal space of the magnetic fluid sealing device and the internal space of the air block protection device may be in direct air-tight communication or indirect air-tight communication along the axial direction, for example, the internal space of the magnetic fluid sealing device and the internal space of the air block protection device may be in air-tight communication through a bearing seat and the like. The arrangement enables the magnetic fluid sealing device and the air blocking protection device to be directly or indirectly connected in an air tightness mode, and only then one end of the air blocking protection device can form the air tightness, so that air can be sealed, and air blocking can be formed in the air blocking protection device.

In the above technical scheme, preferably, a bearing seat is hermetically installed at the through hole, a bearing is installed on the bearing seat, a bearing sleeve is installed on the shaft, and the bearing seat, the air blocking protection device and the magnetic fluid sealing device form an air-tight connection along the axial direction.

In a specific scheme, the air blocking protection device is installed in the outer air blocking cavity and is in sealing connection with one end of the bearing seat, and the magnetic fluid sealing device is installed in the shell and is in sealing connection with one end, far away from the air blocking protection device, of the bearing seat, so that the magnetic fluid sealing device can form air-tight connection with the air blocking protection device through the bearing seat. In another technical scheme, the magnetic fluid sealing device is installed in the outer air blocking cavity, one end of the magnetic fluid sealing device, which is close to the bearing seat, is in sealing connection with the bearing seat, and the air blocking protection device is located on one side, which is far away from the bearing seat, of the magnetic fluid sealing device and is in sealing connection with one end, which is far away from the bearing seat, of the magnetic fluid sealing device.

Wherein, the inner cavity of the outer air blocking cavity is not communicated with the inner part of the shell. Therefore, water vapor, corrosive media and the like in the outer air blocking cavity can be prevented from entering the shell, and parts in the shell can be prevented from being corroded by the water vapor, the corrosive media and the like in the outer air blocking cavity. And the inner space of the magnetic fluid sealing device is hermetically communicated with the inner space of the air-blocking protection device along the axial direction, so that the inner space of the magnetic fluid sealing device and the inner space of the air-blocking protection device can be communicated into a closed cavity body during working, and thus, when the magnetic fluid sealing device is hermetically shielded, an air-blocking cavity can be formed by compressed gas in the closed cavity body, and further, the magnetic fluid sealing device is isolated from liquid outside the air-blocking protection device.

In any of the above schemes, preferably, the housing and the lateral wall in outer gas block chamber formula structure as an organic whole, or the housing with the lateral wall in outer gas block chamber is split type structure, just the housing with be provided with the partition structure between the lateral wall in outer gas block chamber, be provided with the confession on the partition structure the axle passes the via hole, bearing frame seal installation in via hole department, and with partition structure sealing connection.

In a specific preferred scheme, the lateral wall in outer gas block chamber is an outer gas block sleeve, the outer gas block chamber with the part that the shell is connected be one with outer gas block sleeve sealing connection's gas seal end cover, the shell includes shell end cover and shell sleeve, the shell end cover with gas seal end cover sealing connection, the telescopic one end seal installation of shell extremely the shell sleeve, the partition structure by gas seal end cover with the shell end cover is constituteed, the via hole runs through gas seal end cover with the shell end cover, the bearing frame with shell end cover formula structure as an organic whole, or the bearing frame with shell end cover is sealing connection's split type structure.

In another specific preferred embodiment, the housing includes a housing sleeve, the side wall of the outer air lock chamber is formed by an outer air lock sleeve, and the housing sleeve and the outer air lock sleeve are integrally formed.

In one embodiment, preferably, the air lock protection device comprises a packless sealing device sleeved outside the shaft.

Further preferably, the air lock protection device further comprises a lubricating device connected with the non-filler sealing device in a sealing mode, the lubricating device comprises a medium injection pipe communicated with the non-filler sealing device, and the lubricating device is used for injecting lubricating media such as grease into the non-filler sealing device through the medium injection pipe so as to ensure the lubricating effect of the non-filler sealing device. Furthermore, a fabric hose is arranged in the medium injection pipe, one end of the fabric hose is arranged in the medium injection pipe and is in sealing connection with the side wall of the medium injection pipe, and the other end of the fabric hose extends towards the direction close to the non-filler sealing device; after the lubricating device stops injecting the lubricating medium, the inner walls of the other end of the hose with the fabric can be tightly attached to each other to form static seal. Because, after installing the fabric hose in annotating the medium pipe, annotate the medium pipe and be divided into inside and outside two cavitys by the hose, and when the pressure in the cavity of inboard (the cavity that is close to the no filler sealing device and sets up) is greater than the pressure of outside cavity, the inner wall that takes the fabric hose just can be extruded and make its inside closely laminate and form the static seal, and when needs oiling, the oil of infusing can directly strut the inner wall that the hose laminated each other. Therefore, the hose with the fabric plays a role of a one-way valve in the medium injection pipe, so that the medium injection pipe can be sealed and shielded after oil injection is stopped, and gas and the like entering the packless sealing device can be prevented from leaking through the medium injection pipe.

In another specific scheme, preferably, the air lock protection device includes an inner air lock cover installed in the outer air lock cavity and sleeved outside the shaft, and an accommodating cavity sealed by a medium entering the outer air lock cavity is formed between the inner air lock cover and the shaft. Of course, the air-lock protection device may also be other sealing structures capable of being in air-tight communication with the internal space of the magnetic fluid sealing device and forming an internal air lock, for example, the air-lock protection device may be a packless sealing device.

Preferably, the inner wall that interior stifled cover is close to the one end in axle business turn over hole is the toper, it is the toper chamber to hold the chamber, just the cross-sectional area that holds the chamber is from keeping away from the one end in axle business turn over hole is to being close to the one end in axle business turn over hole is crescent, the tip that the one end in axle business turn over hole was kept away from to interior stifled cover of gas is provided with the fixing base, interior stifled cover of gas passes through the fixing base is sealed firmly the via hole, during the installation, accessible fixing base and outer gas block up sealing connection such as chamber or bearing frame to the realization is to the sealing of via. In another scheme, one end of the inner air blocking cover, which is far away from the shaft inlet and outlet hole, is directly and hermetically connected with the magnetic fluid sealing device, so that a fixed seat is not required to be arranged at the upper end of the inner air blocking cover.

In any of the above schemes, preferably, a separating device installed on the shaft is arranged in one end of the inner air blocking cover far away from the shaft inlet and outlet hole, and/or a water retaining device is arranged on one side of the inner air blocking cover close to the shaft inlet and outlet hole, and the water retaining device is installed on the shaft.

Preferably, a blocking part is arranged in the medium injection pipe, the blocking part is positioned at one end, far away from the non-filler sealing device, of the fabric hose, a circulation channel is formed between the blocking part and the inner wall of the medium injection pipe, and the blocking part can be specifically a cross-shaped rib or a tongue and other structures. And the flow passage is used for enabling the medium in the medium injection pipe to normally flow. The fabric hose can be mounted on the inner wall of the medium injection pipe or on the blocking piece.

Further preferably, one end, far away from the shaft inlet and outlet hole, of the inner air blocking cover is a straight section, the separating device is a separating sleeve arranged in the straight section, wherein the separating sleeve is made of a material with a honeycomb shape or a grid shape, and/or the outer side wall of the separating sleeve is arranged in a reverse spiral manner.

Further preferably, the water retaining device is a water retaining ring arranged close to an inlet of the inner air blocking cover.

In any of the above aspects, preferably, the vertical shielding device further includes: and the magnetic isolation device is arranged in the shell, fixed on the shaft and positioned at the upper end of the magnetic fluid sealing device or covered and arranged outside the upper end of the magnetic fluid sealing device.

In any of the above aspects, preferably, the vertical shielding device further includes: and the shielding device is arranged in the shell, fixed on the shaft and positioned at the upper end of the magnetic fluid sealing device or covered and arranged outside the upper end of the magnetic fluid sealing device. The shielding device is used for protecting the upper end of the magnetic fluid sealing device, so that leaked oil or water can be shielded when the bearing or other parts at the upper end of the magnetic fluid sealing device have the problems of oil leakage, water leakage and the like, and the magnetic fluid sealing device is prevented from being damaged by the leaked oil or water and the like from the upper end of the magnetic fluid sealing device.

In a preferred scheme, the via hole department seal installation has the bearing frame, install the bearing on the bearing frame, the bearing housing is established and is installed epaxial, wherein, the magnetic fluid sealing device is installed the stifled intracavity of outer gas is sealed and is lived the via hole, magnetism isolating device is one and installs the magnetism isolating plate in the shell, magnetism isolating plate cover is established and is installed epaxial, and is located the bearing frame is kept away from one side in the stifled chamber of outer gas.

In another preferred scheme, a bearing seat is installed at the position of the via hole in a sealing mode, a bearing is installed on the bearing seat, a bearing sleeve is installed on a shaft, the magnetic fluid sealing device is installed in the shell and located on one side, away from the outer air blocking cavity, of the bearing seat, the magnetic isolation device is a magnetic isolation sleeve installed outside the magnetic fluid sealing device in a sleeved mode, and one end, away from the bearing seat, of the magnetic isolation sleeve is connected with the shaft in a sealing mode.

In any of the above schemes, preferably, the outer air blocking cavity is provided with an air inlet and outlet channel, and the air pressure in the outer air blocking cavity can be adjusted through the air charging and discharging of the air inlet and outlet channel; and/or the pressure of the gas within the housing can be regulated.

In any of the above schemes, preferably, the housing is a motor housing, or the housing is a sleeve sleeved outside the shaft. It is further preferred that a set of bearings is further provided in the upper end of the sleeve, so that the bearings at the upper and lower ends of the sleeve form a bearing body.

In any of the above schemes, preferably, the central lines of the shaft and the outer air blocking cavity are arranged at a preset angle with the vertical direction, and the preset angle is greater than or equal to 0 ° and less than or equal to 20 °. I.e. the axis may be either vertically or slightly inclined at a small angle.

In any of the above schemes, preferably, the magnetic fluid sealing device is in dynamic sealing fit with the shaft, so that abrasion between the magnetic fluid sealing device and the shaft can be reduced.

According to the utility model discloses a vertical shield assembly that embodiment provided, a shaft for to vertical setting is sealed, therefore, shield assembly in this application is a vertical shield assembly, and the one end of the axle of vertical setting is installed in the shell, the output of axle is stretched out outside the shell by the one end of shell, vertical shield assembly includes that the magnetic fluid sealing device who carries out the magnetic fluid seal with the stifled chamber of outer gas of shell sealing connection and counter shaft, wherein, the first end in outer gas stifled chamber is used for and shell sealing installation, the second end in outer gas stifled chamber can carry out the gas tightness with rotating equipment such as all water pumps that need the confined pressure and be connected, and the inside cavity in outer gas stifled chamber has except that the axle is imported and exported totally airtight, and not with outside intercommunication, just so can form an independent outer gas stifled chamber around the output of axle. And the magnetic fluid sealing device can also seal the via hole, so that the upper end of the outer gas blocking cavity can be strictly sealed by the magnetic fluid sealing device, the air tightness is formed, and the upper end of the outer gas blocking cavity can be sealed by gas. Preferably, the vertical shielding device further comprises an air blocking protection device arranged in the outer air blocking cavity, and the air blocking protection device is also in air tight connection with the magnetic fluid sealing device, so that the magnetic fluid sealing device can also strictly seal the upper end of the air blocking protection device, air tightness is formed, and further, gas can be sealed in the air blocking protection device. This kind of structure, the via hole between outer shell and the outer stifled chamber of gas is sealed by one or more among the axle, bearing or the magnetic fluid sealing device, and does not set up other intercommunication passageways between outer shell and the outer stifled chamber, in this application, does not communicate between the inside cavity in outer shell and the outer stifled chamber, can prevent like this that the inside steam in outer gas stifled chamber, corrosive medium etc. from entering into in the shell, therefore can avoid the spare part in the shell to be corroded by the inside steam in outer gas stifled chamber, corrosive medium etc.. The shaft output end extending out of the shell is inserted into the outer air blocking cavity in a sealing mode, then extends out of the shaft inlet and outlet hole of the second end of the outer air blocking cavity, the magnetic fluid sealing device is a zero-leakage dynamic seal and can reliably seal the shaft, when the magnetic fluid sealing device is installed, the magnetic fluid sealing device can be installed in the outer air blocking cavity or the shell according to actual needs, but the magnetic fluid sealing device is required to seal the through hole, and the magnetic fluid sealing device and the air blocking protection device are directly or indirectly connected in an air-tight mode. With the structure, when the vertical shielding device works, the shaft inlet and outlet holes of the outer air blocking cavity are sealed by liquid, so that, after the liquid outside the outer air blocking cavity enters the outer air blocking cavity through the shaft inlet and outlet hole, the gas inside the outer air blocking cavity can be gradually compressed until the pressure of the gas is equal to that of the liquid, when the pressure of the gas is equal to that of the liquid, the liquid level in the outer gas blocking cavity can not rise, after the liquid level stops, the magnetic fluid sealing device and the liquid are separated by the compressed gas all the time, so that the liquid is blocked by the compressed gas in the outer gas blocking cavity, the blocking effect of the gas on the liquid is the so-called gas blocking effect of the application, so that the magnetic fluid sealing device cannot be contacted with the liquid through the gas blocking effect of the outer gas blocking cavity, and the working performance of the magnetic fluid sealing is guaranteed. Specifically, in the practical process, the pressure in the outer air blocking cavity can be reasonably set according to the pressure of liquid, so that the liquid level height can be reasonably controlled, and the compressed gas in the outer air blocking cavity can be utilized to separate the magnetic fluid sealing device from the liquid in the fluid pumping device and the like. The air-blocking protection device is used for further axially sealing the magnetic fluid sealing device through the formed air-blocking in the outer air-blocking cavity and before the magnetic fluid sealing device, so that after the shaft output end is connected with the fluid pumping device and the like, liquid or volatile gas and the like in the fluid pumping device and the like are prevented from contacting with the magnetic fluid sealing device, the magnetic fluid sealing device can be protected by the air-blocking protection device, the magnetic fluid sealing device is ensured not to contact with water or volatile liquid medium and the like in the working process, and the working performance of magnetic fluid sealing can be ensured. Specifically, in the structure, the inner spaces of the magnetic fluid sealing device and the gas blocking protection device can be directly or indirectly in sealed communication along the axial direction through the sealed non-communicated connection between the outer gas blocking cavity and the shell, the gas-tight connection between the magnetic fluid sealing device and the gas blocking protection device and the sealing of the gas blocking protection device to the through hole, so that the inner space of the magnetic fluid sealing device and the inner space of the gas blocking protection device can be communicated into a closed cavity during working, and thus, when the magnetic fluid sealing device is sealed and shielded, gas in the closed cavity can be compressed through liquid pressure to form gas blocking in the closed cavity, so that the magnetic fluid sealing device can be protected through the gas blocking formed by the gas blocking protection device, and the liquid isolation between the magnetic fluid sealing device and the outer side of the gas blocking protection device is realized. In the technical scheme, the magnetic fluid sealing device, the outer air blocking cavity and the air blocking protection device are combined for use, and the combined vertical shielding device has the sealing effect that the magnetic fluid sealing device is completely free from leakage, can also form a larger air blocking cavity by sealing the outer air blocking cavity through external liquid during sealing and shielding, can realize the sealing of a closed cavity formed by communicating the inner space of the magnetic fluid sealing device with the inner space of the air blocking protection device through sealing the lower end of the air blocking protection device through the external liquid, can form a smaller air blocking cavity by compressing gas in the closed cavity through the external liquid, ensures that the magnetic fluid sealing device cannot be contacted with the liquid during the use through the air blocking of the inner and outer double-layer air blocking cavities, so that the vertical shielding device can be used for sealing and shielding of a driving shaft of a water pump and the like, the vertical shielding device also realizes high-efficiency leakage-free sealing shielding performance, realizes real 0 leakage, solves the problem that the axial sealing cannot be realized in the prior art, and solves the problem that the high-efficiency leakage-free performance cannot be realized under the working conditions of conveying toxic and harmful media, such as inflammable and explosive media, crystallization media, particles and the like. In addition, this kind of structure, because can also block corrosive gas such as outside steam, acid-base through outer stifled chamber and stifled protection device of gas, avoid corrosive gas such as steam, acid-base to act on the magnetic current body to enter into the shell, therefore can also avoid magnetic current body, the inside spare part of shell to be corroded by corrosive gas such as steam, acid-base. When the vertical shielding device is used for sealing a driving shaft of a fluid pumping device and the like, the sealing and shielding effects of the fluid pumping device and the like are ensured, so that the fluid pumping device and the like can realize efficient zero leakage.

The magnetic fluid sealing device can be installed in the shell, and at the moment, the shell and the structure in the shell need to be adjusted adaptively. The magnetic fluid sealing device can be arranged in the shell of the shaft, so that the magnetic fluid sealing device can be completely isolated from liquid by means of the outer air blocking cavity, the probability of contact of the magnetic fluid sealing device with liquid such as water can be further reduced, the working performance of magnetic fluid sealing is guaranteed, and the sealing effect of the whole vertical shielding device without leakage is guaranteed.

Certainly, in other embodiments, the magnetic fluid sealing device can also be installed in the outer air blocking cavity, at this moment, the structures inside the shell and the shell do not need to be changed, only the vertical shielding device needs to be installed at the output end of the shaft, so the vertical shielding device can be directly used for the existing shaft products, and the existing shaft products do not need to be greatly changed, so that the high efficiency and leakage-free realization of the existing shaft products can be ensured, the transformation cost of the existing shaft products is reduced, the popularization and application of the vertical shielding device are facilitated, and the market competitiveness of the vertical shielding device can be enhanced.

The utility model discloses the second aspect provides a shielded motor, include: a motor assembly including a motor housing and a motor shaft; in the vertical shielding device provided in any embodiment of the first aspect, a first end of an outer air blocking cavity of the vertical shielding device is hermetically connected with the motor housing, and a through hole for the motor shaft to pass through is formed between the motor housing and the outer air blocking cavity; the input end of the motor shaft is installed in the motor shell, and the output end of the motor shaft penetrates through the motor shell through the through hole and is inserted into the outer air blocking cavity.

According to the utility model discloses a shield motor that embodiment provided, including the vertical shield assembly that any embodiment of motor element and first aspect provided, when the installation, can block up the first end sealing connection in chamber with motor element's motor housing and vertical shield assembly's outer gas to the via hole that makes the output of motor shaft block up the junction in chamber by motor housing and outer gas inserts outer gas and blocks up the intracavity. With such a structure, the shaft surface of the motor shaft can be sealed and shielded by using the vertical shielding device provided in any embodiment of the first aspect, so that the vertical shielding device provided in any embodiment of the first aspect has the beneficial effects, and details are not repeated herein.

Further preferably, the canned motor is a pressure-bearing motor, i.e., a motor with adjustable gas pressure in the motor housing.

Further, the motor assembly further comprises a motor rotor and a stator assembly which are arranged on the motor shell, and the motor rotor and the stator assembly are used for realizing the rotation driving of the motor shaft. Meanwhile, the motor shell is internally provided with a magnetic isolation device such as a magnetic isolation plate or a magnetic isolation sleeve, so that the magnetic field generated by the motor rotor and the stator assembly during working can be prevented from influencing the sealing of the magnetic fluid sealing device through the magnetic isolation device such as the magnetic isolation plate or the magnetic isolation sleeve.

An embodiment of the third aspect of the present invention provides a canned motor pump, including: any embodiment of the second aspect provides a canned motor; and the pump is arranged at the shaft inlet and outlet hole of the outer air blocking cavity in an air-tight manner, and the rotating part of the pump is connected with the motor shaft of the shielding motor. Preferably, the motor shaft is inserted into the connection of the rotating part in the pump, although the connection of the rotating part to the motor shaft can also be realized by means of an intermediate shaft.

According to the utility model discloses a canned motor that any item in the second aspect embodiment provided can be utilized to the canned pump that provides carries out the drive of pump, consequently, has canned motor's that any item in the second aspect embodiment provided beneficial effect, no longer explains here.

It should be understood that what is described in this disclosure section is not intended to limit key or critical features of embodiments of the invention, nor is it intended to be used to limit the scope of the invention. Other features of the present invention will become apparent from the following description.

Drawings

Fig. 1 is a schematic structural diagram of a vertical shielding device according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a vertical shielding device according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a vertical shielding device according to a third embodiment of the present invention;

fig. 4 is a schematic structural diagram of a vertical shielding device according to a fourth embodiment of the present invention;

fig. 5 is a schematic structural diagram of a vertical shielding device according to a fifth embodiment of the present invention;

fig. 6 is a partially enlarged schematic view of a portion a in fig. 5.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 6 is:

1 axle, 2 shells, 22 shell sleeves, 24 shell end covers, 3 outer air blocking cavities, 30 inner cavities, 32 outer air blocking sleeves, 34 air sealing end covers, 4 through holes, 5 magnetic fluid sealing devices, 62 first air blocking protection devices, 622 inner air blocking covers, 624 separating devices, 626 water retaining devices, 64 non-packing sealing devices, 66 lubricating devices, 662 medium injection pipes, 664 fabric hoses, 72 bearing seats, 74 bearings, 8a magnetic isolation sleeves and 8b magnetic isolation plates.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 to 6, the vertical shielding device provided according to the first aspect of the present invention is used for sealing a vertically disposed shaft 1, wherein a housing 2 is disposed outside the shaft 1, the vertical shielding device includes an outer air blocking cavity 3 and a magnetic fluid sealing device 5, wherein,

the outer air blocking cavity 3 is vertically arranged along the axial direction, the first end of the outer air blocking cavity 3 is hermetically connected with the shell 2, a through hole 4 is formed between the shell 2 and the outer air blocking cavity 3, and a shaft inlet and outlet hole is formed in the second end of the outer air blocking cavity 3;

the magnetic fluid sealing device 5 is arranged at the through hole 4 and used for sealing the through hole 4;

wherein, one end of the shaft 1 is positioned in the shell 2, and the other end of the shaft 1 passes through the magnetic fluid sealing device 5 and extends into the outer air blocking cavity 3.

According to the embodiment of the utility model, a vertical shielding device is provided, be used for sealing the axle 1 of vertical setting, and the one end of the axle 1 of vertical setting is installed in shell 2, the one end of axle 1 stretches out outside shell 2 by the one end of shell 2, vertical shielding device includes outer air blocking cavity 3 with shell 2 sealing connection, and carry out the magnetic fluid sealing device 5 of magnetic fluid sealing to axle 1, wherein, the axle seal that stretches out by shell 2 inserts and installs in outer air blocking cavity 3, then stretch out by the axle business turn over hole of the second end of outer air blocking cavity 3, and magnetic fluid sealing device 5 is a zero-leakage dynamic seal, on one hand can carry out the dynamic seal to axle 1, on the other hand magnetic fluid sealing device 5 can also seal hole 4, just so can utilize magnetic fluid sealing device 5 to carry out the strict seal to the upper end in outer air blocking cavity 3, thereby form the gas tightness, thereby enabling the upper end of the outer gas block chamber 3 to seal off gas. And when being installed, the magnetic fluid sealing device 5 can be installed in the outer air blocking cavity 3 or the shell 2 according to actual needs. The first end of the outer air blocking cavity 3 is used for being mounted with the shell 2 in a sealing mode, after the through hole 4 is sealed by the magnetic fluid sealing device 5, the first end of the outer air blocking cavity 3 forms air tightness, the second end of the outer air blocking cavity 3 can be in air tightness connection with all rotating equipment needing pressure sealing, such as water pumps, and the like, the inner cavity 30 of the outer air blocking cavity 3 is completely sealed except for the shaft inlet and the shaft outlet and is not communicated with the inside of the shell 2, and therefore an independent air blocking cavity can be formed around the output end of the shaft 1. In the structure, when the vertical shielding device works, the via hole at the upper part of the outer air blocking cavity 3 is sealed by the magnetic fluid sealing device 5, so that the air tightness is formed, the shaft inlet and outlet hole of the outer air blocking cavity 3 is sealed by liquid, so that the outer air blocking cavity 3 is sealed to form a structure with very good air tightness, therefore, after the liquid outside the outer air blocking cavity 3 enters the outer air blocking cavity 3 through the shaft inlet and outlet hole, the gas inside the outer air blocking cavity 3 cannot leak, so that the liquid entering from the outside can only gradually compress the gas inside the outer air blocking cavity 3 until the pressure of the gas is equal to that of the liquid, after the pressure of the gas is equal to that of the liquid, the liquid level in the outer air blocking cavity 3 cannot rise, and after the liquid level stops, the magnetic fluid sealing device 5 can always be separated from the liquid by the compressed gas in the outer air blocking cavity 3, so that the liquid is blocked by the compressed gas in the outer air blocking cavity 3, the blocking effect of the gas on the liquid is the so-called gas blocking effect in the application, so that the magnetic fluid sealing device 5 cannot be contacted with the liquid through the gas blocking effect of the outer gas blocking cavity 3, the working performance of the magnetic fluid sealing device 5 is guaranteed, and the vertical type shielding device can be used for sealing and shielding the driving shaft 1 of a water pump and the like. Meanwhile, the vertical shielding device realizes high-efficiency leakage-free sealing and shielding performance through the magnetic fluid sealing device 5 and the outer air blocking cavity 3, and realizes real 0 leakage.

Specifically, in the practical process, the pressure in the outer air blocking cavity 3 can be reasonably set according to the pressure of liquid, so that the liquid level height can be reasonably controlled, and the compressed gas in the outer air blocking cavity 3 can be utilized to separate the magnetic fluid sealing device 5 from the liquid in the fluid pumping device and the like.

As shown in fig. 1, 2 and 5, the magnetic fluid sealing device 5 can be installed in the housing 2, and in this case, the housing 2 and the internal structure thereof need to be adaptively adjusted. Due to the arrangement, the magnetic fluid sealing device 5 can be arranged inside the shell 2 of the shaft 1, so that the magnetic fluid sealing device 5 can be completely isolated from liquid by means of the outer air blocking cavity 3, the probability of contact between the magnetic fluid sealing device 5 and liquid such as water can be further reduced, the working performance of magnetic fluid sealing is guaranteed, and the sealing effect of the whole vertical shielding device without leakage is further guaranteed.

Certainly, in other embodiments, as shown in fig. 3 and 4, the magnetic fluid sealing device 5 may also be installed in the outer air blocking cavity 3, at this time, the structures inside the outer shell 2 and the outer shell 2 do not need to be changed, and only the vertical shielding device needs to be installed at one end of the shaft 1, so that the vertical shielding device can be directly used for the existing shaft products, and the existing shaft products do not need to be greatly changed.

Further preferably, the vertical shielding device further includes: the air blocking protection device is arranged in the outer air blocking cavity 3 and is in air-tight connection with the lower end of the magnetic fluid sealing device 5 along the axial direction, and the air blocking protection device is arranged on the outer side of the part of the shaft 1 extending into the outer air blocking cavity 3 in a surrounding mode; the magnetic fluid sealing device 5 is installed in the shell 2 and seals the through hole 4, and the air blocking protection device is arranged close to the through hole 4 and seals the through hole 4, so that the air blocking protection device and the magnetic fluid sealing device 5 are in air-tight connection. Or the magnetic fluid sealing device 5 is arranged in the air blocking cavity and seals the through hole 4, and the air blocking protection device is arranged at the lower end of the magnetic fluid sealing device 5 and is fixedly connected with the magnetic fluid sealing device 5 in a sealing way. The air-lock protection device may specifically include a first air-lock protection device composed of the inner air-lock cover 622 and the separation device 624 in fig. 1 and 3, or may specifically be another first air-lock protection device composed of the inner air-lock cover 622 and the water-blocking device 626 in fig. 2 and 4, or, of course, may also be the packless sealing device 64 in fig. 5.

In this embodiment, the vertical shielding device further includes an air-lock protection device, and the air-lock protection device is connected to the lower end of the magnetic fluid sealing device 5 in an air-tight manner along the axial direction, so that the upper end of the air-lock protection device can be sealed by the magnetic fluid sealing device 5 to form air-tight property, and thus the air-lock protection device can lock gas after the lower end of the air-lock protection device is sealed by liquid. Therefore, after liquid outside the air blocking protection device enters the air blocking protection device, gas inside the air blocking protection device cannot be leaked, the liquid entering from the outside can only gradually compress gas inside the air blocking protection device, so that an air block is formed in the air blocking protection device, and the magnetic fluid sealing device 5 can be further axially sealed in the outer air blocking cavity 3 through the air block formed in the air blocking protection device, so that after the shaft 1 is connected with the fluid pumping device and the like, the liquid or volatile gas in the fluid pumping device and the like is prevented from contacting with the magnetic fluid sealing device 5, the magnetic fluid sealing device 5 can be protected through the air block formed by the air blocking protection device, and further the magnetic fluid sealing device 5 is isolated from the liquid outside the air blocking protection device. The structure combines the magnetic fluid sealing device 5, the outer air blocking cavity 3 and the air blocking protection device for use, and the combined vertical shielding device, not only has the sealing effect that the magnetic fluid sealing device 5 has no leakage completely, but also can realize the sealing and shielding, the outer air-blocking cavity 3 forms a larger air-blocking cavity by sealing the outer air-blocking cavity 3 with the outer liquid, meanwhile, the sealing of the airtight cavity formed by the communication of the internal space of the magnetic fluid sealing device 5 and the internal space of the air blocking protection device can be realized through the sealing of the lower end of the air blocking protection device by external liquid, thus, the air in the airtight cavity can be compressed by the external liquid to form a smaller air blocking cavity, therefore, the magnetic fluid sealing device 5 is ensured not to be contacted with liquid in the use process through the air blocking of the inner and outer double-layer air blocking cavities.

Specifically, as shown in fig. 1, 2 and 5, when the magnetic fluid sealing device 5 is installed in the housing 2, the air blocking protection device is disposed near the via hole 4 and seals the via hole 4, as shown in fig. 3 and 4, when the magnetic fluid sealing device 5 is installed in the outer air blocking cavity 3 and blocks the via hole 4, the air blocking protection device is installed on one side of the magnetic fluid sealing device 5 away from the via hole 4 and is in sealing contact with the magnetic fluid sealing device 5, and the inner cavity 30 of the outer air blocking cavity 3 is not communicated with the inside of the housing 2.

Specifically, as shown in fig. 1 to 4, the outer air lock chamber 3 includes at least one side wall and an inner chamber 30, and the inner chamber 30 may be defined by the side wall and the housing 2, and of course, the outer air lock chamber 3 may also include a bottom structure and/or a top structure, and the bottom structure and/or the top structure facilitates the sealing connection of the outer air lock chamber 3 with the housing 2 or the housing 2 of the load device.

Further preferably, the gas in the outer air blocking chamber 3 is air. Therefore, the air in the outer air blocking cavity 3 can form isolation and blocking for the external liquid, and further the magnetic fluid is prevented from contacting with the liquid.

Preferably, the outer shell 2 is not communicated with the outer air blocking cavity 3, and the pressure of the air in the outer shell 2 can be adjusted. The pressure within the housing 2 of such an arrangement is itself adjustable. In particular, the vertical shielding device can be used, for example, for the sealed shielding of a motor shaft of a pressure-bearing motor.

Wherein, vertical shield assembly self in this application can bear certain pressure P (for example about 2 kilograms), consequently, when the liquid pressure of axle business turn over side is less than pressure P, just need not fill gas in the outer gas blockage chamber 3 and adjust its inside gas pressure. For example, when the lower end of the vertical shielding device is connected with a self-priming pump, the pressure at the inlet of the pump is negative pressure, so that the pressure is less than the pressure P of the shaft surface air-tight sealing shielding, and an air inlet and outlet channel for adjusting the internal pressure of the outer air-tight sealing cavity 3 is not needed. When the lower end of the vertical shielding device is connected with a reverse filling pump or a traditional shielding pump, the pressure at the inlet of the pump is generally higher, at the moment, on one hand, the number of turns of the magnetic fluid sealing device 5 can be increased to increase the pressure-bearing pressure P of the shaft surface air-tight shielding, and on the other hand, an air inlet and outlet channel for adjusting the internal pressure of the air-tight shielding cavity 3 can be arranged so as to adjust the internal pressure of the air-tight shielding according to actual needs. In addition, when the vertical shielding device is used for a motor, the motor can be set to be an air-tight water-cooled motor under the condition that the pressure of the inlet side and the outlet side of the shaft is large, so that the pressure in the motor can be adjusted to maintain balance with the pressure of the inlet side and the outlet side of the pump shaft, the liquid pressure cannot exceed the gas pressure in the vertical shielding device, and the vertical shielding device can form effective air blocking to ensure that the magnetic fluid sealing device 5 cannot be in contact with the liquid.

In the above solution, preferably, as shown in fig. 1 to 5, a bearing seat 72 is hermetically mounted at the through hole 4, a bearing 74 is mounted on the bearing seat 72, and the bearing 74 is mounted on the shaft 1 in a sleeved manner. At this time, as shown in fig. 1, 2 and 5, the air lock protection device is installed in the outer air lock chamber 3 and is hermetically connected to one end of the bearing seat 72, and the magnetic fluid sealing device 5 is installed in the housing 2 and is hermetically connected to one side of the bearing seat 72 away from the via hole 4. In another embodiment, as shown in fig. 3 and 4, a bearing seat 72 is hermetically installed at the via hole 4, a bearing 74 is installed on the bearing seat 72, the bearing 74 is installed on the shaft 1 in a sleeved manner, the magnetic fluid sealing device 5 is installed in the outer air blocking cavity 3, is located on one side of the air blocking protection device close to the via hole 4, and is hermetically connected with the bearing seat 72 at the via hole 4, and is located on one side of the magnetic fluid sealing device 5 away from the bearing seat 72, and is hermetically connected with one end of the magnetic fluid sealing device 5 away from the bearing seat 72.

In this embodiment, the bearing seat 72 is hermetically installed at the through hole 4, and the bearing seat 72 may be installed close to the outer casing 2, or close to the outer air blocking cavity 3, or, of course, may be installed at the connection between the outer casing 2 and the outer air blocking cavity 3. A bearing 74 is mounted on the bearing block 72, the bearing 74 being used to support the shaft 1. When the magnetic fluid sealing device 5 is installed in the housing 2, the magnetic fluid sealing device 5 is preferably installed above the bearing 74, that is, the bearing 74 is installed in the housing 2 close to the outer air blocking cavity 3, the magnetic fluid sealing device 5 is installed in the housing 2 at a side relatively far away from the outer air blocking cavity 3, meanwhile, the end faces, close to each other, of the magnetic fluid sealing device 5 and the bearing seat 72 are mutually and hermetically connected, and the end faces, close to each other, of the bearing seat 72 and the air blocking protection device are also mutually and hermetically connected. Of course, in another embodiment, the magnetic fluid sealing device 5 can also be installed in the outer air blocking cavity 3 and is installed between the bearing seat 72 and the air blocking protection device in a sealing way, and the inner space of the bearing seat 72, the inner space of the magnetic fluid sealing device 5 and the inner space of the air blocking protection device are communicated in a sealing way. And the inner space of the bearing seat 72, the inner space of the magnetic fluid sealing device 5 and the inner space of the air-blocking protection device are hermetically communicated, so that the inner space of the magnetic fluid sealing device 5, the inner space of the bearing seat 72 and the inner space of the air-blocking protection device can form a sealed airtight cavity, an opening of the airtight cavity is positioned on one side of the air-blocking protection device close to the shaft inlet and outlet hole, and the opening is sealed by the air-blocking protection device through air blocking, namely, the liquid is isolated and blocked by compressed air, so that the external liquid cannot penetrate through the compressed air in the airtight cavity and is contacted with the magnetic fluid sealing device 5, and thus, the magnetic fluid sealing device 5 can be effectively prevented from being contacted with the liquid.

Further, when the outer sleeve 22 of the housing 2 and the side wall of the outer air blocking cavity 3 are integrally formed, the bearing 74 may be directly and hermetically installed at the joint between the outer sleeve 22 of the housing 2 and the side wall of the outer air blocking cavity 3, and at this time, the upper and lower end faces of the bearing 74 are both hermetically connected to the magnetic fluid seal and the air blocking protection device.

Wherein, preferably, the magnetic fluid sealing device 5 is in sealing contact with the bearing 74 along the axial direction when installed in the housing 2, and the bearing 74 is in sealing connection with the air blocking protection device. When the magnetic fluid sealing device 5 is arranged in the outer air blocking cavity 3, the magnetic fluid sealing device 5 is in sealing contact with the air blocking protection device.

In any of the above embodiments, preferably, the side walls of the outer casing 2 and the outer air lock chamber 3 are of an integral structure (not shown in the drawings in this embodiment), or as shown in fig. 1 to 4, the side walls of the outer casing 2 and the outer air lock chamber 3 are of a split structure, a separation structure is arranged between the side walls of the outer casing 2 and the outer air lock chamber 3, a through hole 4 for the shaft 1 to pass through is arranged on the separation structure, and the bearing seat 72 is hermetically mounted at the through hole 4 and is hermetically connected with the separation structure.

In this embodiment, the side walls of the outer casing 2 and the outer air lock chamber 3 are of an integral structure, and specifically, the side walls of the outer casing 2 and the outer air lock chamber 3 may be of an integral structure formed by welding or an integral structure. Preferably, the outer casing 2 and the side wall of the outer air blocking chamber 3 are integrally formed, that is, the side wall of the outer air blocking chamber 3 is preferably formed by extending the outer casing 2 forward, so that the connection sealing performance and the connection reliability between the outer casing 2 and the side wall of the outer air blocking chamber 3 can be improved. Of course, in another embodiment, the side walls of the outer casing 2 and the outer air blocking chamber 3 may be a detachable structure. But the lateral wall of shell 2 and outer stifled chamber 3 of gas is no matter integral type structure, still split type structure, all is provided with the partition structure between the lateral wall in shell 2 and outer stifled chamber 3 of gas to can separate the inside in shell 2 and outer stifled chamber 3 of gas, and be provided with the via hole 4 that supplies axle 1 to pass on the partition structure, be sealed cooperation between via hole 4 and the axle 1. The separation structure may be an end portion of one end of the outer casing 2 connected to the outer air blocking cavity 3, or an end portion of one end of the outer air blocking cavity 3 connected to the outer casing 2.

Preferably, the bearing seat 72 and the partition structure are of an integral structure, or as shown in fig. 3 and 4, the bearing seat 72 and a part of the partition structure are connected to form an integral structure, but in other solutions, the bearing seat 72 may be of a completely separate structure from the partition structure as shown in fig. 1, 2 and 5.

In a specific embodiment, as shown in fig. 1 to 5, the side wall of the outer air blocking cavity 3 is an outer air blocking sleeve 32, the portion of the outer air blocking cavity 3 connected to the outer housing 2 is an air sealing end cover 34 hermetically connected to the outer air blocking sleeve 32, the outer housing 2 includes an outer housing end cover 24 and an outer housing sleeve 22, the outer housing end cover 24 is hermetically connected to the air sealing end cover 34, one end of the outer housing sleeve 22 is hermetically mounted to the outer housing sleeve 22, the separation structure is composed of the air sealing end cover 34 and the outer housing end cover 24, and the through hole 4 penetrates through the air sealing end cover 34 and the outer housing end cover 24, as shown in fig. 3 and 4, the bearing seat 72 and the outer housing end cover 24 are of an integral structure, or as shown in fig. 1, 2 and 5, the bearing seat 72 and the outer housing end cover 24 are.

In another embodiment (not shown), the side walls of the housing 2 and the outer air lock chamber 3 are formed as an integral sleeve structure, and the partition structure is a partition plate installed in the integral sleeve structure, and the partition plate is provided with a through hole 4 for the shaft 1 to pass through. Preferably, the housing 2 comprises a housing sleeve 22, the side wall of the outer air blocking cavity 3 is composed of an outer air blocking sleeve 32, and the housing sleeve 22 and the outer air blocking sleeve 32 are integrally formed.

In any of the above embodiments, preferably, as shown in fig. 1 to 4, the air blocking protection device is a first air blocking protection device 62, the first air blocking protection device 62 includes an inner air blocking cover 622, and an accommodating cavity capable of being sealed by a medium entering into the outer air blocking cavity 3 is formed between the inner air blocking cover 622 and the shaft 1.

In these embodiments, the air lock protection device is a first air lock protection device 62, the first air lock protection device 62 includes an inner air lock cover 622 sleeved outside the portion of the shaft 1 located in the outer air lock cavity 3, a receiving cavity is formed between the inner air lock cover 622 and the shaft 1, and the upper end of the inner air lock cover 622 is in sealing contact with the bearing seat 72 or the magnetic fluid sealing device 5, so that the inner space of the inner air lock cover 622 can be in air-tight communication with the inner space of the bearing seat 72 or the inner space of the magnetic fluid sealing device 5. With the structure, when the vertical shielding device works, the shaft inlet and outlet hole of the outer air blocking cavity 3 is sealed by liquid, so that the inner part of the outer air blocking cavity 3 can be sealed by the liquid to form a completely closed inner space, therefore, after the liquid outside the outer air blocking cavity 3 enters the outer air blocking cavity 3 through the shaft inlet and outlet hole, the gas in the outer air blocking cavity 3 can be gradually compressed until the pressure of the gas is equal to that of the liquid, and after the pressure of the gas is equal to that of the liquid, the liquid level in the outer air blocking cavity 3 cannot rise, meanwhile, because the space in the inner air blocking cover 622 is smaller, the gas in the inner air blocking cover 622 is more difficult to be compressed, therefore, the liquid level in the outer air blocking cavity 3 is always higher than that of the inner air blocking cover 622, and after the bottom of the inner air blocking cover 622 is completely sealed by the liquid level and the liquid stops unchanged, the principle of a diving bell can be known, the outside liquid can not enter the inner air blocking cover 622 again, so that the separation of the liquid can be realized by the same principle of a diving bell, at the moment, the inner air blocking cover 622 is filled with compressed gas all the time, therefore, the compressed gas in the inner air blocking cover 622 can prevent the magnetic fluid sealing device 5 from contacting with the liquid, and further the working performance of the magnetic fluid sealing device 5 can be ensured, so that the vertical shielding device formed by combining the magnetic fluid sealing device 5, the outer air blocking cavity 3 and the inner air blocking cover 622 can achieve the sealing effect without leakage completely.

In another embodiment, as shown in fig. 5, the air lock protection device is a second air lock protection device, the second air lock protection device includes a packless sealing device 64, the packless sealing device 64 includes an annular cavity installed axially and a plurality of sealing rings installed axially in the annular cavity, a pressing member for pressing the sealing rings against the side wall of the shaft 1 is further disposed between the annular cavity and the sealing rings, and the sealing rings can be sealed against the side wall of the shaft 1 by pressing the pressing member. In the structure, when the vertical shielding device works, the shaft inlet and outlet hole of the outer air blocking cavity 3 is sealed by liquid, so that after the liquid outside the outer air blocking cavity 3 enters the outer air blocking cavity 3 through the shaft inlet and outlet hole, the gas inside the outer air blocking cavity 3 can be gradually compressed until the pressure of the gas is equal to that of the liquid, and after the pressure of the gas is equal to that of the liquid, the liquid level inside the outer air blocking cavity 3 cannot rise (in the practical process, the height of the non-filler sealing device 64 can be reasonably set according to the pressure of the liquid, so that the liquid level inside the outer air blocking cavity 3 cannot exceed the non-filler sealing device 64, and therefore, after the liquid level stops, the magnetic fluid sealing device 5 can be separated from the liquid all the time, so that the magnetic fluid sealing device 5 cannot be contacted with the liquid, so that the working performance of magnetic fluid sealing is ensured, this kind of packless sealing device 64 has the blocking of a plurality of sealing rings, consequently, can also prevent that steam or volatile medium etc. in the outer gas blocking chamber 3 from passing a plurality of sealing rings and contacting with magnetic fluid sealing device 5 to can avoid magnetic fluid sealing device 5 to be corroded the damage by steam or corrosive gas such as strong acid, alkali, poisonous and harmful. Therefore, the vertical shielding device can be used for sealing and shielding acid, alkali and other corrosive media besides the effect of efficient zero-leakage sealing and shielding.

Further preferably, as shown in fig. 5 and 6, the second air lock protection device further includes a lubricating device 66 in sealing connection with the packless sealing device 64, the lubricating device 66 includes a medium injection pipe 662 in communication with the packless sealing device 64, and the lubricating device 66 is used for injecting a lubricating medium such as grease into the packless sealing device 64 through the medium injection pipe 662 to ensure the lubrication of the packless sealing device 64. A fabric hose 664 is arranged in the medium injection pipe 662, one end of the fabric hose 664 is arranged in the medium injection pipe 662 and is connected with the side wall of the medium injection pipe 662 in a sealing way, and the other end of the fabric hose 664 extends towards the direction close to the non-filler sealing device 64; after the medium injection pipe 662 stops injecting oil, the inner walls of the other ends of the fabric hoses 664 can be tightly attached to each other to form static seal. Because, after the fabric hose 664 is installed in the medium injection pipe 662, the medium injection pipe 662 is divided into an inner cavity and an outer cavity by the hoses, and when the pressure in the inner cavity (the cavity arranged close to the packless sealing device 64) is greater than the pressure in the outer cavity, the inner wall of the fabric hose 664 is squeezed to enable the inner wall to be tightly attached to form static seal, and when oil is needed to be injected, the injected oil can directly prop open the inner walls of the fabric hose 664 which are attached to each other. This allows the fabric hose 664 to function as a check valve in the medium pouring tube 662, so that the medium pouring tube 662 can be sealed and shielded after the lubrication device 66 stops pouring the lubricating medium, thus preventing gas or the like entering the packless sealing device 64 from leaking through the medium pouring tube 662.

Further preferably, a blocking member such as a cross-shaped rib, a cross-shaped rib or a tongue is arranged in the medium injection pipe 662, the blocking member is located at one end of the fabric hose 664, which is far away from the packless sealing device 64, and a circulation channel is formed between the blocking member and the inner wall of the medium injection pipe 662, and by arranging the blocking member, the fabric hose 664 is blocked when the fabric hose 664 is pressed and retracts towards the inlet of the medium injection pipe 662, so that the blocking member is prevented from moving and transiting towards the inlet of the medium injection pipe 662 after being pressed. At the same time, the stop member also enhances the pressure-bearing capacity of the fabric-carrying hose 664. And the circulation passage is used to allow the medium in the medium filling pipe 662 to normally circulate. And the fabric hose 664 may be installed on either the inner wall of the medium injection pipe 662 or the blocking member. Of course, the blocking member may not be provided in normal use.

Preferably, as shown in fig. 1 to 4, the inner wall of the inner air blocking cover 622 near one end of the shaft access hole is tapered, the accommodating cavity is a tapered cavity, and the cross-sectional area of the accommodating cavity gradually increases from the end far away from the shaft access hole to the end near the shaft access hole.

Further preferably, as shown in fig. 1 to 4, the inner and outer portions of the inner air blocking cover 622 are tapered structures which are gradually flared from top to bottom. Therefore, the cross-sectional area of the inside of the inner air blocking cover 622 can be gradually increased from top to bottom, and the phenomenon that liquid leaks due to siphoning of the inner air blocking cover 622 during sealing can be avoided.

Further preferably, as shown in fig. 1, 2 and 5, when the magnetic fluid sealing device 5 is installed in the housing 2 and located at the input side of the bearing seat 72, the end of the inner air blocking cover 622 away from the shaft access hole is provided with a fixed seat hermetically connected with the bearing seat 72. Through setting up the fixing base, can make things convenient for the upper portion terminal surface of interior gas shutoff cover 622 and the lower part terminal surface sealing connection of bearing frame 72 to make and can form the airtight cavity of sealed intercommunication between these three inner space of bearing frame 72, interior gas shutoff cover 622 and magnetic fluid sealing device 5, thereby can make magnetic fluid sealing device 5 and liquid contact through the separation that compressed gas formed.

Further preferably, as shown in fig. 3 and 4, when the magnetic fluid sealing device 5 is installed in the outer air blocking cavity 3 and is located on the lower side of the bearing seat 72, one end of the inner air blocking cover 622 away from the shaft inlet and outlet hole is directly connected with the magnetic fluid sealing device 5 in a sealing manner.

In any of the above solutions, preferably, as shown in fig. 1 and 3, the air lock protection device further includes a separation device 624 mounted on the shaft, the separation device 624 being disposed in an end of the inner air lock 622 remote from the shaft access hole, and/or the air lock protection device further includes a water blocking device 626, the water blocking device 626 being mounted on the shaft and being disposed on a side of the inner air lock 622 close to the shaft access hole.

In this embodiment, when the air lock protection device is a structure including the inner air lock cover 622, in order to prevent the moisture, impurities, etc. from contacting the magnetic fluid sealing device 5 through the inner air lock cover 622, the separating device 624 is disposed in one end of the inner air lock cover 622 away from the shaft inlet and outlet hole, so that the moisture, impurities, etc. entering the inner air lock cover 622 can be separated from the gas through the adsorption effect and/or the centrifugal force effect during rotation of the separating device 624, and the moisture, impurities, etc. are prevented from contacting the magnetic fluid sealing device 5 through the inner air lock cover 622, so that the magnetic fluid sealing device 5 can be further effectively protected by the separating device 624. In another embodiment, in order to prevent the medium inside and outside the outer air blocking cavity from splashing into the inner air blocking cover 622, a water blocking device 626 capable of rotating along with the shaft is arranged on one side of the inner air blocking cover 622 close to the shaft inlet and outlet hole, so that the external liquid can be prevented from entering the inner air blocking cover 622 by the blocking of the water blocking device 626 and the centrifugal action generated when the water blocking device 626 rotates, and the magnetic fluid sealing device 5 can be further effectively protected by the water blocking device 626. One of the separating device 624 and the water blocking device 626 can be arranged according to the requirement, and of course, the separating device 624 and the water blocking device 626 can also be arranged at the same time. The external corrosive gases such as water vapor, acid and alkali can be blocked by the separating device 624 and the water blocking device 626, so that the corrosive gases such as water vapor, acid and alkali are prevented from acting on the magnetic fluid and entering the shell 2, and the magnetic fluid and parts in the shell 2 can be prevented from being corroded by the corrosive gases such as water vapor, acid and alkali. When the vertical shielding device is used for sealing a driving shaft 1 of a fluid pumping device and the like, the sealing shielding effect of the fluid pumping device and the like is ensured, efficient zero leakage can be realized for the fluid pumping device and the like, the problem of leakage of axial sealing which cannot be realized in the prior art is solved, and the problem of high efficiency and no leakage cannot be realized under the working conditions of conveying toxic and harmful media, flammability and explosiveness, easiness in crystallization, particles and the like is solved.

Further preferably, as shown in fig. 1 and 3, an end of the inner air blocking cover 622 away from the shaft inlet and outlet hole is a straight section, that is, an upper portion of the inner air blocking cover 622 is a straight section, and the separating device 624 is a separating sleeve installed in the straight section, wherein the separating sleeve is made of a material with a honeycomb shape or a grid shape. The separating sleeve is made of honeycomb or latticed materials, so that the adsorption capacity of the separating sleeve on water vapor, impurities and the like can be improved, and the adsorption capacity on the water vapor, the impurities and the like can be realized. Preferably, the separating sleeve is made of a material having a high water absorbability, such as a silk material.

Further preferably, the lateral wall of separation sleeve is the reverse spiral setting, and centrifugal force and the action of gravity such as steam when rotatory through the separation sleeve like this can get rid of the steam and the impurity that enter into the separation sleeve outside from the export of interior stifled cover 622 of gas, so alright further improve the separation sleeve to the ability of blocking of steam and impurity etc. improve the safety protection rank to magnetic fluid sealing device 5.

It is further preferred that the water stop 626 is a water stop ring disposed near the inlet of the inner air block 622 as shown in fig. 2 and 4, although the water stop 626 may have other configurations.

In any of the above aspects, preferably, the vertical shielding device further includes: and the magnetism isolating device is arranged in the shell 2, fixed on the shaft 1 and positioned at the upper end of the magnetic fluid sealing device 5 or covered and arranged outside the upper end of the magnetic fluid sealing device 5.

In the embodiments, the magnetic isolation device can prevent other magnetic fields inside the casing 2 from acting on the magnetic fluid sealing device 5 to interfere the magnetic fluid seal, influence the use effect of the magnetic fluid seal and even cause the magnetic fluid seal to fail. For example, when a magnetic field device is installed inside the housing 2, in order to prevent the magnetic field device from interfering with the magnetic fluid of the magnetic fluid sealing device 5, the magnetic isolation device may be used to isolate the magnetic field so as to avoid the magnetic field interference. Particularly, when the vertical shielding device is used for a motor, for example, a magnetic field is generated when the motor works, and the magnetic field can interfere with the magnetic fluid seal, influence the use effect of the magnetic fluid seal and even cause the magnetic fluid seal to fail. Therefore, when the device is installed close to the motor, a magnetic isolation device can be arranged at one end of the magnetic fluid sealing device 5 far away from the air blocking protection device, namely above the magnetic fluid sealing device 5, so as to isolate the magnetic field of the motor. Of course, the use of a magnetic shield device may be eliminated when the device is not mounted close to a device capable of generating a magnetic field, such as a motor. That is, in the present application, the magnetic shielding device may be provided as an optional component as shown in fig. 1, 2 and 5, and in this case, the magnetic shielding device is shown by a broken line in the drawing, but of course, the magnetic shielding device may be provided as an optional component as shown in fig. 3 and 4, and in this case, the magnetic shielding device is shown by a solid line in the drawing.

In any of the above embodiments, preferably, the vertical shielding device further includes: and the shielding device is arranged in the shell 2, fixed on the shaft 1 and positioned at the upper end of the magnetic fluid sealing device 5 or covered and arranged outside the upper end of the magnetic fluid sealing device 5. The shielding device is used for protecting the upper end of the magnetic fluid sealing device 5, so that leaked oil or water can be shielded when the bearing or other parts at the upper end of the magnetic fluid sealing device 5 have the problems of oil leakage, water leakage and the like, and the magnetic fluid sealing device is prevented from being damaged by the leaked oil or water and the like from the upper end of the magnetic fluid sealing device 5.

In a specific embodiment, as shown in fig. 1, fig. 2 and fig. 5, a bearing seat 72 is hermetically installed at the through hole 4, a bearing 74 is installed on the bearing seat 72, the magnetic fluid sealing device 5 is installed on the housing 2 and is located at one side of the bearing seat 72 in the housing 2, which is far away from the outer air blocking cavity 3, the magnetic isolation device is a set of magnetic isolation sleeve 8a installed outside the magnetic fluid sealing device 5, and one end of the magnetic isolation sleeve 8a, which is far away from the bearing seat 72, is hermetically connected with the shaft 1. The structure enables the magnetism isolating sleeve 8a to isolate the external magnetic field so as to avoid the external magnetic field from interfering the magnetic fluid to influence sealing.

In another embodiment, as shown in fig. 3 and 4, a bearing seat 72 is hermetically installed at the through hole 4, a bearing 74 is installed on the bearing seat 72, the magnetic fluid sealing device 5 is installed in the outer air blocking cavity 3 and located at a side of the air blocking protection device away from the shaft inlet and outlet hole, the magnetic isolation device is a magnetic isolation plate 8b installed in the housing 2 or the motor housing, the magnetic isolation plate 8b is installed on the shaft 1 in a sleeved manner, and is located at a side of the bearing seat 72 in the housing 2 away from the outer air blocking cavity 3. With this arrangement, when the magnetic fluid sealing device 5 is installed in the outer air lock chamber 3, a magnetic shield 8b may be provided above the bearing seat 72 to prevent the magnetic field in the casing 2 from acting on the magnetic fluid sealing device 5 in the outer air lock chamber 3 in the axial direction.

Of course, in other embodiments, the structure and the installation position of the magnetic shielding device can be adjusted according to actual needs, and are not limited to the position and the structure described in the present application.

Preferably, the magnetic isolation device is made of isolation materials with good isolation effect, such as lead, ceramics and the like. In this case, the magnetic shielding device may be configured as a lead plate, a lead cover, a ceramic plate, a ceramic cover, or the like. Of course, the magnetic isolation device can be made of other materials with good magnetic isolation effect according to actual needs.

In the above embodiment, preferably, the gas pressure in the outer gas blocking cavity 3 can be adjusted, specifically, the outer gas blocking cavity 3 is provided with a gas inlet and outlet channel, and the gas pressure in the outer gas blocking cavity 3 can be adjusted by the inflation and deflation of the gas inlet and outlet channel. With the arrangement, when the liquid to be pumped at the output end of the shaft has pressure, the liquid level in the outer air blocking cavity 3 can be adjusted by correspondingly adjusting the pressure in the outer air blocking cavity 3. Therefore, the vertical shielding device has certain pressure bearing capacity, and the pressure bearing capacity can be correspondingly adjusted according to the liquid pressure sealed as required, so that the vertical shielding device can still ensure the high-efficiency zero-leakage sealing shielding effect on a high-pressure occasion. Of course, when the vertical shielding device is used for medium sealing occasions with low pressure, the pressure in the outer air blocking cavity 3 can also be set to be a fixed value, and at the moment, the pressure bearing capacity of the vertical shielding device is limited, so that the vertical shielding device is only suitable for occasions where the external medium pressure is smaller than the limit pressure of the vertical shielding device.

Preferably, the outer air blocking cavity 3 is provided with an air inlet and outlet channel, and the air pressure in the outer air blocking cavity 3 can be adjusted through the air charging and discharging of the air inlet and outlet channel. The outer shell 2 and the outer air block up between the chamber 3 and not communicate, and the gas pressure in the outer shell 2 can be adjusted, and this kind of setting makes outer shell 2 and outer air block up chamber 3 all can adjust its internal pressure alone, simultaneously, this kind sets up outer shell 2 itself and can form a zero air cavity of revealing, therefore sealed the output of motor, simultaneously, this kind of setting still can realize the sealed of the first end of outer air block up chamber 3 through outer shell 2.

In any of the above embodiments, preferably, the housing 2 is a motor housing, or the housing 2 is a sleeve sleeved on the shaft.

In any of the above embodiments, preferably, the central lines of the shaft 1 and the outer air blocking cavity 3 are arranged at a preset angle with the vertical direction, and the preset angle is greater than or equal to 0 ° and less than or equal to 20 °. I.e. the shaft 1 may be either vertically arranged or slightly inclined at a small angle.

In any of the above embodiments, it is preferable that the magnetic fluid sealing device 5 is in dynamic sealing fit with the shaft 1, so that the abrasion between the magnetic fluid sealing device 5 and the shaft 1 can be reduced.

The utility model discloses a second aspect provides a canned motor (not shown in the figure), include: a motor assembly including a motor housing and a motor shaft; in the vertical shielding device provided by any embodiment of the first aspect, the first end of an outer air blocking cavity 3 of the vertical shielding device is hermetically connected with a motor shell, and a through hole 4 for a motor shaft to pass through is formed between the motor shell and the outer air blocking cavity 3; wherein, the input of motor shaft is installed in motor housing, and the output of motor shaft passes motor housing by the via hole and inserts in outer stifled chamber 3.

According to the utility model discloses a shield motor that embodiment provided, including the vertical shield assembly that any one embodiment of motor element and first aspect provided, when the installation, can block up the first end sealing connection in chamber 3 with motor element's motor housing and vertical shield assembly's outer gas to make the output of motor shaft insert outer gas by the via hole 4 of motor housing and the outer gas stifled junction in chamber 3 and block up in the chamber 3. Meanwhile, all the rotating equipment needing to be sealed and pressed is connected with the second end of the outer air blocking cavity 3 in an air-tight way. With such a structure, the shaft surface of the motor shaft can be sealed and shielded by using the vertical shielding device provided in any embodiment of the first aspect, so that the vertical shielding device provided in any embodiment of the first aspect has the beneficial effects, and details are not repeated herein.

Further preferably, the canned motor is a pressure-bearing motor, i.e. a motor with adjustable gas pressure in the motor housing.

Further preferably, as shown, a bearing assembly is further arranged in the motor housing, two ends of the bearing assembly are hermetically mounted with the air-blocking protection device and the magnetic fluid sealing device 5, and an internal space of the bearing assembly, an internal space of the air-blocking protection device and an internal space of the magnetic fluid sealing device 5 are hermetically communicated with each other to form a hermetically communicated sealed cavity, so that the air-blocking formed by the hermetically communicated cavity can prevent liquid outside the air-blocking protection device from passing through the whole hermetically communicated cavity to contact with the magnetic fluid sealing device 5. The bearing assembly can be a single bearing, and can also be a structure comprising a bearing body and a bearing seat.

Further preferably, the vertical shielding device further includes: and the magnetic isolation device is arranged in the motor shell, sleeved on the motor shaft and positioned at one end of the magnetic fluid sealing device 5 far away from the air blockage protection device, or covered and arranged outside the magnetic fluid sealing device 5. Specifically, the magnetism isolating device may be embodied as the magnetism isolating sleeve 8a or the magnetism isolating plate 8b of fig. 1 to 4.

Further, the motor assembly further comprises a motor rotor and a stator assembly which are arranged on the motor shell, and the motor rotor and the stator assembly are used for realizing the rotation driving of the motor shaft. Meanwhile, the motor shell is also internally provided with a magnetism isolating device such as a magnetism isolating plate 8b or a magnetism isolating sleeve 8a, and therefore, the sealing of the magnetic fluid sealing device 5 is prevented from being influenced by the magnetic field generated by the motor rotor and stator components during working through the magnetism isolating device such as the magnetism isolating plate 8b or the magnetism isolating sleeve 8 a.

Preferably, the motor is an air-tight water-cooled motor, i.e. a pressure-bearing motor with adjustable pressure inside the motor.

An embodiment of the third aspect of the present invention provides a canned motor pump, including: any embodiment of the second aspect provides a canned motor; and the pump is arranged at the shaft inlet and outlet hole of the outer air blocking cavity 3 in an air-tight manner, and the rotating part of the pump is connected with a motor shaft of the shielding motor. Preferably, the motor shaft is inserted into the pump and connected to the rotating part, although the connection of the rotating part to the motor shaft may be achieved through an intermediate shaft.

In the description of the present specification, the terms "connect", "mount", "fix", and the like are to be understood in a broad sense, for example, "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, the description of the terms "one embodiment," "some embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. 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.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides a vertical shield assembly for seal the axle of vertical setting, its characterized in that, be provided with the shell outside the axle, vertical shield assembly includes:

2. The vertical shield according to claim 1, further comprising:

the air blocking protection device is arranged in the outer air blocking cavity and is in air-tight connection with the lower end of the magnetic fluid sealing device along the axial direction, and the air blocking protection device is arranged on the outer side of the part of the shaft extending into the outer air blocking cavity in a surrounding manner;

the magnetic fluid sealing device is arranged in the shell and seals the via hole, the air blocking protection device is arranged close to the via hole and seals the via hole, or the magnetic fluid sealing device is arranged in the air blocking cavity and seals the via hole, and the air blocking protection device is arranged at the lower end of the magnetic fluid sealing device and is fixedly connected with the magnetic fluid sealing device in a sealing mode.

3. The vertical shielding device according to claim 2,

a bearing seat is hermetically arranged at the through hole, a bearing is arranged on the bearing seat, and the bearing is sleeved on the shaft;

wherein the air-blocking protection device is arranged in the outer air-blocking cavity and is hermetically connected with one end of the bearing seat, the magnetic fluid sealing device is arranged in the shell and is hermetically connected with one end of the bearing seat far away from the air-blocking protection device, or

The magnetic fluid sealing device is arranged in the outer air blocking cavity, one end, close to the bearing seat, of the magnetic fluid sealing device is in sealing connection with the bearing seat, and the air blocking protection device is located on one side, far away from the bearing seat, of the magnetic fluid sealing device and is in sealing connection with one end, far away from the bearing seat, of the magnetic fluid sealing device.

4. The vertical shielding device according to claim 3,

the shell with the lateral wall formula structure as an organic whole in outer gas shutoff chamber, or the shell with the lateral wall in outer gas shutoff chamber is split type structure, just the shell with be provided with the partition structure between the lateral wall in outer gas shutoff chamber, be provided with the confession on the partition structure the axle passes the via hole, bearing frame seal installation in via hole department, and with partition structure sealing connection.

5. The vertical shielding device according to claim 4,

the side wall of the outer gas blocking cavity is an outer gas blocking sleeve, the part of the outer gas blocking cavity, which is connected with the shell, is a gas sealing end cover which is in sealing connection with the outer gas blocking sleeve, the shell comprises a shell end cover and a shell sleeve, the shell end cover is in sealing connection with the gas sealing end cover, one end of the shell sleeve is hermetically mounted to the shell sleeve, the separation structure consists of the gas sealing end cover and the shell end cover, the through hole penetrates through the gas sealing end cover and the shell end cover, and the bearing seat and the shell end cover are of an integrated structure or a split structure in which the bearing seat and the shell end cover are in sealing connection; or

The shell comprises a shell sleeve, the side wall of the outer air blocking cavity is formed by an outer air blocking sleeve, and the shell sleeve and the outer air blocking sleeve are integrally formed.

6. The vertical shielding device according to claim 2,

the air blockage protection device comprises a non-filler sealing device and a lubricating device, wherein the non-filler sealing device is sleeved outside the shaft, the lubricating device is connected with the non-filler sealing device in a sealing mode, the lubricating device comprises a medium injection pipe communicated with the non-filler sealing device, a fabric hose is arranged in the medium injection pipe, one end of the fabric hose is arranged in the medium injection pipe and is connected with the side wall of the medium injection pipe in a sealing mode, and the other end of the fabric hose extends towards the direction close to the non-filler sealing device; after the lubricating device stops injecting the lubricating medium, the inner walls of the other end of the fabric hose can be tightly attached to each other to form static seal; or

The air blocking protection device comprises an inner air blocking cover which is arranged in the outer air blocking cavity and sleeved outside the shaft, and a containing cavity which can be sealed by a medium entering the outer air blocking cavity is formed between the inner air blocking cover and the shaft.

7. The vertical shielding device according to claim 6,

the inner wall of one end, close to the shaft inlet and outlet hole, of the inner air blocking cover is conical, the accommodating cavity is a conical cavity, the cross section area of the accommodating cavity is gradually increased from one end, far away from the shaft inlet and outlet hole, to one end, close to the shaft inlet and outlet hole, of the accommodating cavity, a fixing seat is arranged at the end part, far away from the shaft inlet and outlet hole, of the inner air blocking cover, the inner air blocking cover seals the through hole through the fixing seat, or one end, far away from the shaft inlet and outlet hole, of the inner air blocking cover is directly and hermetically connected with the magnetic fluid sealing device; and/or

And a separating device arranged on the shaft is arranged in one end, far away from the shaft inlet and outlet, of the inner air blocking cover, and/or a water retaining device is arranged on one side, close to the shaft inlet and outlet, of the inner air blocking cover, and the water retaining device is arranged on the shaft.

8. The vertical shielding device according to claim 7,

one end of the inner air blocking cover, which is far away from the shaft inlet and outlet hole, is a straight section, and the separating device is a separating sleeve arranged in the straight section, wherein the separating sleeve is made of honeycomb or latticed materials, and/or the outer side wall of the separating sleeve is arranged in a reverse spiral manner; and/or

The water retaining device is a water retaining ring arranged close to the inlet of the inner air blocking cover.

9. The vertical shield according to any one of claims 1 to 8, further comprising:

the magnetic isolation device is arranged in the shell, fixed on the shaft and positioned at the upper end of the magnetic fluid sealing device or covered and arranged outside the upper end of the magnetic fluid sealing device; and/or

And the shielding device is arranged in the shell, fixed on the shaft and positioned at the upper end of the magnetic fluid sealing device or covered and arranged outside the upper end of the magnetic fluid sealing device.

10. The vertical shielding device according to claim 9,

the via hole department seal mounting has the bearing frame, install the bearing on the bearing frame, the bearing housing is established and is installed epaxial, wherein, magnetic fluid sealing device installs outer stifled intracavity, and seal and live the via hole, magnetism isolating device is one and installs magnetism isolating plate in the shell, magnetism isolating plate cover is established and is installed epaxial, and is located the bearing frame is kept away from one side in outer stifled chamber of gas, or

The magnetic fluid sealing device is arranged in the shell and is positioned on one side, far away from the outer air blocking cavity, of the bearing seat, the magnetic isolation device is a magnetic isolation sleeve which is sleeved outside the magnetic fluid sealing device, and one end, far away from the bearing seat, of the magnetic isolation sleeve is connected with the shaft in a sealing mode.

11. Vertical screening device according to one of claims 1 to 8,

an air inlet and outlet channel is arranged on the outer air blocking cavity, and the air pressure in the outer air blocking cavity can be adjusted through the inflation and deflation of the air inlet and outlet channel; and/or

The pressure of the gas in the housing is adjustable; and/or

The shell is a motor shell, or the shell is a sleeve sleeved outside the shaft; and/or

The central lines of the shaft and the outer air blocking cavity are arranged at a preset angle with the vertical direction, and the preset angle is more than or equal to 0 degree and less than or equal to 20 degrees; and/or

The magnetic fluid sealing device is in dynamic sealing fit with the shaft.

12. A canned motor, comprising:

a motor assembly including a motor housing and a motor shaft;

the vertical shielding device according to any one of claims 1 to 11, wherein a first end of an outer air blocking cavity of the vertical shielding device is connected with the motor housing in a sealing manner, and a through hole for the motor shaft to pass through is arranged between the motor housing and the outer air blocking cavity;

the input end of the motor shaft is installed in the motor shell, and the output end of the motor shaft penetrates through the motor shell through the through hole and is inserted into the outer air blocking cavity.

13. A canned motor pump, comprising:

the shielded electrical machine of claim 12; and

and the pump is arranged at the shaft inlet and outlet hole of the outer air blocking cavity in an airtight manner, and the rotating part of the pump is connected with the motor shaft of the shielding motor.