Vertical canned motors, canned motors and canned pumps

Abstract

The present invention discloses a vertical shielding device, a shielded motor and a shielded pump. The vertical shielding device is used to seal a vertically arranged shaft. A shell is provided outside the shaft. The vertical shielding device includes an outer air blocking cavity with a first end sealedly connected to the shell. A through hole is provided between the shell and the outer air blocking cavity. A magnetic fluid sealing device is sealed and installed at the through hole. One end of the shaft passes through the magnetic fluid sealing device from the shell and is inserted into the outer air blocking cavity. A shaft inlet and outlet hole is provided on the second end of the outer air blocking cavity. Preferably, an air blocking protection device airtightly connected to the magnetic fluid sealing device is also provided in the outer air blocking cavity, and the air blocking protection device is arranged around the outside of the shaft. This structure, when working, can utilize the air blocking formed in the outer air blocking cavity and the air blocking formed in the air blocking protection device to prevent the magnetic fluid sealing device from contacting the liquid, thereby ensuring the working performance of the magnetic fluid seal and solving the technical problem that the existing axial seal cannot achieve high efficiency and no leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of shaft surface sealing, and in particular to a vertical shielding device, a shielded motor and a shielded pump. Background Art

[0002] Magnetic fluid sealing technology is a new type of sealing method. It refers to the use of magnetic fluid with high saturation magnetic strength to seal related mechanical equipment. Magnetic fluid sealing is a zero-leakage dynamic seal with excellent sealing effect. However, one disadvantage of magnetic fluid sealing is that it cannot come into contact with liquid. This makes it impossible to use magnetic fluid sealing for sealing the drive shaft of products such as water pumps, because the drive shaft of the water pump will inevitably come into contact with the liquid in the water pump.

[0003] Therefore, how to design a vertical shielding device that can use magnetic fluid sealing technology to seal the drive shaft of a water pump, etc. has become a problem that needs to be solved urgently. Summary of the Invention

[0004] An object of the present invention is to provide a vertical shielding device to at least solve one of the problems raised in the above background technology.

[0005] To achieve the above objectives, the first aspect of the present invention provides a vertical shielding device.

[0006] A second aspect of the present invention provides a canned motor, and a third aspect of the present invention provides a canned pump.

[0007] According to the technical solution of the first aspect of the present invention, a vertical shielding device is provided for sealing a vertically arranged shaft, wherein a housing is provided outside the shaft, and the vertical shielding device comprises:

[0008] The outer air blocking cavity is vertically arranged along the axial direction, and the first end of the outer air blocking cavity is sealed with the outer shell, a through hole is provided between the outer shell and the outer air blocking cavity, and the second end of the outer air blocking cavity is provided with a shaft inlet and outlet hole;

[0009] A magnetic fluid sealing device, installed at the through hole, for sealing the through hole;

[0010] One end of the shaft is located in the housing, and the other end of the shaft passes through the magnetic fluid sealing device and extends into the outer air blocking cavity.

[0011] Further preferably, the vertical shielding device further comprises: an air-blocking protection device, installed in the outer air-blocking cavity and air-tightly connected to the lower end of the magnetic fluid sealing device along the axial direction, and the air-blocking protection device is disposed around the outside of the portion where the shaft extends into the outer air-blocking cavity; wherein the magnetic fluid sealing device is installed in the housing and seals the through-hole, and the air-blocking protection device is disposed adjacent to the through-hole and seals the through-hole, thereby achieving an air-tight connection between the air-blocking protection device and the magnetic fluid sealing device. Alternatively, the magnetic fluid sealing device is installed in the air-blocking cavity and seals the through-hole, and the air-blocking protection device is mounted at the lower end of the magnetic fluid sealing device and is sealed and fixedly connected to the magnetic fluid sealing device.

[0012] The internal space of the magnetic fluid sealing device is in airtight communication with the internal space of the air-blocking protection device in the axial direction. Specifically, the internal space of the magnetic fluid sealing device and the internal space of the air-blocking protection device can be directly or indirectly airtightly connected in the axial direction. For example, the internal space of the magnetic fluid sealing device and the internal space of the air-blocking protection device can be airtightly connected via a bearing seat or the like. This arrangement enables a direct or indirect airtight connection between the magnetic fluid sealing device and the air-blocking protection device, and only in this way can one end of the air-blocking protection device be airtight, thereby sealing the gas and forming an air blockage in the air-blocking protection device.

[0013] In the above technical solution, preferably, a bearing seat is sealed and installed at the through hole, a bearing is installed on the bearing seat, the bearing sleeve is installed on the shaft, and the bearing seat, the air blockage protection device and the magnetic fluid sealing device form an airtight connection along the axial direction.

[0014] In one specific solution, the air-blocking protection device is installed in the outer air-blocking cavity and is sealed with one end of the bearing seat, and the magnetic fluid sealing device is installed in the outer shell and is sealed with one end of the bearing seat away from the air-blocking protection device, so that the magnetic fluid sealing device can form an airtight connection through the bearing seat and the air-blocking protection device. In another technical solution, the magnetic fluid sealing device is installed in the outer air-blocking cavity, and the end of the magnetic fluid sealing device close to the bearing seat is sealed with the bearing seat, and the air-blocking protection device is located on the side of the magnetic fluid sealing device away from the bearing seat, and is sealed with the end of the magnetic fluid sealing device away from the bearing seat.

[0015] The internal cavity of the outer air blocking cavity is not connected to the interior of the outer shell. This prevents moisture, corrosive media, etc. from entering the outer shell, thereby preventing the components within the outer shell from being corroded by moisture, corrosive media, etc. from the outer air blocking cavity. Furthermore, the internal space of the magnetic fluid sealing device is sealed and connected to the internal space of the air blocking protection device in the axial direction, so that the internal space of the magnetic fluid sealing device and the internal space of the air blocking protection device can be connected to form a closed cavity during operation. Thus, during sealing and shielding, the compressed gas in the closed cavity can form an air blocking cavity, thereby isolating the magnetic fluid sealing device from the liquid outside the air blocking protection device.

[0016] In any of the above schemes, preferably, the outer shell and the side wall of the outer air blocking cavity are an integral structure, or the outer shell and the side wall of the outer air blocking cavity are a split structure, and a partition structure is provided between the outer shell and the side wall of the outer air blocking cavity, the partition structure is provided with the through hole for the shaft to pass through, the bearing seat seal is installed at the through hole, and is sealed and connected to the partition structure.

[0017] In a specific preferred embodiment, the side wall of the external gas blocking cavity is an external gas blocking sleeve, the part of the external gas blocking cavity connected to the outer shell is a gas sealing end cover sealed with the external gas blocking sleeve, the outer shell includes an outer shell end cover and an outer shell sleeve, the outer shell end cover is sealed with the gas sealing end cover, one end of the outer shell sleeve is sealed and installed to the outer shell sleeve, the partition structure is composed of the gas sealing end cover and the outer shell end cover, the through hole passes through the gas sealing end cover and the outer shell end cover, the bearing seat and the outer shell end cover are an integrated structure, or the bearing seat and the outer shell end cover are a split structure with a sealing connection.

[0018] In another specific preferred embodiment, the outer shell includes an outer shell sleeve, the side wall of the outer air blocking cavity is formed by an outer air blocking sleeve, and the outer shell sleeve and the outer air blocking sleeve are integrally formed.

[0019] In a specific solution, preferably, the gas blockage protection device includes a packingless sealing device sleeved and installed outside the shaft.

[0020] Further preferably, the gas blockage protection device further includes a lubricating device hermetically connected to the packingless sealing device, the lubricating device including a medium injection pipe communicating with the packingless sealing device, the lubricating device being configured to inject a lubricating medium such as grease into the packingless sealing device through the medium injection pipe to ensure lubrication of the packingless sealing device. Furthermore, a fabric hose is disposed within the medium injection pipe, one end of the fabric hose being mounted within the medium injection pipe and hermetically connected to a sidewall of the medium injection pipe, the other end of the fabric hose extending toward the packingless sealing device. After the lubricating device stops injecting lubricating medium, the inner wall of the other end of the fabric hose can be tightly abutted against each other, forming a static seal. This is because, after the fabric hose is installed within the medium injection pipe, the pipe is divided into an inner and outer chamber by the hose. When the pressure within the inner chamber (the chamber disposed adjacent to the packingless sealing device) is greater than the pressure within the outer chamber, the inner wall of the fabric hose is squeezed, causing the inner chamber to tightly abut against each other, forming a static seal. When oil injection is required, the injected oil can directly push the abutted inner walls of the hoses apart. In this way, the fabric hose acts as a one-way valve in the medium injection pipe, so that the medium injection pipe can be sealed and shielded after the oil injection is stopped, thus preventing the gas entering the packingless sealing device from leaking through the medium injection pipe.

[0021] In another specific embodiment, the air block protection device preferably includes an inner air block cover mounted within the outer air block cavity and sleeved onto the outside of the shaft, with a housing formed between the inner air block cover and the shaft to seal a medium that can enter the outer air block cavity. Of course, the air block protection device can also be another sealing structure that can be in airtight communication with the internal space of the magnetic fluid sealing device to form an inner air block, for example, the air block protection device can be a packingless sealing device.

[0022] Preferably, the inner wall of the inner air blocking cover at one end close to the shaft inlet and outlet hole is tapered, the accommodating cavity is a tapered cavity, and the cross-sectional area of the accommodating cavity gradually increases from the end away from the shaft inlet and outlet hole to the end close to the shaft inlet and outlet hole. A fixing seat is provided at the end of the inner air blocking cover at one end away from the shaft inlet and outlet hole, and the inner air blocking cover seals the through hole through the fixing seat. During installation, it can be sealed and connected to the outer air blocking cavity or the bearing seat through the fixing seat to achieve sealing of the through hole. In another embodiment, the end of the inner air blocking cover away from the shaft inlet and outlet hole is directly sealed and connected to the magnetic fluid sealing device, so that there is no need to provide a fixing seat at the upper end of the inner air blocking cover.

[0023] In any of the above schemes, preferably, a separation device installed on the shaft is provided at the end of the inner air blocking cover away from the shaft inlet and outlet hole, and / or a water retaining device is provided on the 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.

[0024] Preferably, a barrier is provided within the medium injection pipe. The barrier is located at the end of the fabric hose away from the packingless sealing device, and a flow channel is formed between the barrier and the inner wall of the medium injection pipe. The barrier can be a cross-shaped rib, a cross-shaped rib, or a tongue structure. The flow channel is used to ensure the normal flow of the medium within the medium injection pipe. The fabric hose can be mounted on either the inner wall of the medium injection pipe or the barrier.

[0025] Further preferably, the end of the inner air blocking cover away from the shaft inlet and outlet hole is a straight section, and the separation device is a separation sleeve installed in the straight section, wherein the separation sleeve is made of a honeycomb or grid-shaped material, and / or the outer side wall of the separation sleeve is arranged in a reverse spiral.

[0026] Further preferably, the water retaining device is a water retaining ring provided near the entrance of the inner air blocking cover.

[0027] In any of the above schemes, preferably, the vertical shielding device also includes: a magnetic isolation device, installed in the shell, fixed on the shaft, located at the upper end of the magnetic fluid sealing device or installed outside the upper end of the magnetic fluid sealing device.

[0028] In any of the above-mentioned solutions, preferably, the vertical shielding device further comprises: a shielding device installed within the housing, fixed to the shaft, and located at the upper end of the magnetic fluid sealing device or mounted outside the upper end of the magnetic fluid sealing device. The shielding device is used to protect the upper end of the magnetic fluid sealing device. In this way, when a bearing or other component at the upper end of the magnetic fluid sealing device leaks oil or water, the shielding device can block the leaked oil or water, thereby preventing the leaked oil or water from damaging the magnetic fluid sealing device through the upper end of the magnetic fluid sealing device.

[0029] In a preferred embodiment, a bearing seat is sealed and installed at the through hole, a bearing is installed on the bearing seat, and the bearing sleeve is installed on the shaft, wherein the magnetic fluid sealing device is installed in the external air blocking cavity and seals the through hole, and the magnetic isolation device is a magnetic isolation plate installed in the outer shell, and the magnetic isolation plate sleeve is installed on the shaft and is located on the side of the bearing seat away from the external air blocking cavity.

[0030] In another preferred embodiment, a bearing seat is sealed and installed at the through hole, a bearing is installed on the bearing seat, the bearing sleeve is installed on the shaft, the magnetic fluid sealing device is installed in the outer shell and is located on the side of the bearing seat away from the external air blocking cavity, the magnetic isolation device is a magnetic isolation sleeve installed outside the magnetic fluid sealing device, and the magnetic isolation sleeve is sealed and connected to the shaft at one end away from the bearing seat.

[0031] In any of the above schemes, preferably, an air inlet and outlet channel is provided on the outer air blocking cavity, and the gas pressure in the outer air blocking cavity can be adjusted by filling and discharging the air in the air inlet and outlet channel; and / or the gas pressure in the outer shell can be adjusted.

[0032] In any of the above solutions, preferably, the housing is a motor housing, or the housing is a sleeve mounted on the outside of the shaft. Further preferably, 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 can form a bearing body.

[0033] In any of the above solutions, preferably, the axis and the centerline of the outer air blocking cavity are arranged at a preset angle to the vertical direction, and the preset angle is greater than or equal to 0° and less than or equal to 20°. That is, the axis can be arranged vertically or slightly tilted at a small angle.

[0034] In any of the above solutions, preferably, the magnetic fluid sealing device and the shaft are in dynamic sealing cooperation, which can reduce the wear between the magnetic fluid sealing device and the shaft.

[0035] According to an embodiment of the present invention, a vertical shielding device is provided for sealing a vertically arranged shaft. Therefore, the shielding device in the present application is a vertical shielding device, and one end of the vertically arranged shaft is installed in the housing, and the output end of the shaft extends from one end of the housing to the outside of the housing. The vertical shielding device includes an outer air blocking cavity sealed with the housing and a magnetic fluid sealing device for magnetic fluid sealing the shaft, wherein the first end of the outer air blocking cavity is used for sealing installation with the housing, and the second end of the outer air blocking cavity can be airtightly connected to all rotating equipment such as water pumps that need to be sealed, and the internal cavity of the outer air blocking cavity is completely sealed except for the shaft inlet and outlet, and is not connected to the outside, so that an independent outer air blocking cavity can be formed around the output end of the shaft. The magnetic fluid sealing device can also seal the through hole, so that the upper end of the outer air blocking cavity can be strictly sealed by the magnetic fluid sealing device, thereby forming airtightness, so that the upper end of the outer air blocking cavity can seal the gas. Preferably, the vertical shielding device also includes an air-blocking protection device installed in the outer air-blocking cavity, and the air-blocking protection device is also airtightly connected to the magnetic fluid sealing device. In this way, the magnetic fluid sealing device can also strictly seal the upper end of the air-blocking protection device, thereby forming airtightness, and further allowing the gas inside the air-blocking protection device to be sealed. In this structure, the through hole between the outer shell and the outer air-blocking cavity is sealed by one or more of the shaft, bearing or magnetic fluid sealing device, and no other communication channel is provided between the outer shell and the outer air-blocking cavity. That is, in this application, the outer shell is not connected to the internal cavity of the outer air-blocking cavity. This can prevent water vapor, corrosive media, etc. inside the outer air-blocking cavity from entering the outer shell, thereby preventing the components inside the outer shell from being corroded by water vapor, corrosive media, etc. inside the outer air-blocking cavity. The shaft output end seal extending from the outer shell is inserted into the outer air plug cavity and then extends out from the shaft inlet and outlet hole at the second end of the outer air plug cavity. The magnetic fluid sealing device is a zero-leakage dynamic seal, which can reliably seal the shaft. During installation, it can be installed in the outer air plug cavity or the outer 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 plug protection device are directly or indirectly connected in an airtight manner, because only in this way can the outer air plug cavity and one end of the air plug protection device form airtightness, thereby sealing the gas, so that the outer air plug cavity and the lower end of the air plug protection device can form an air plug after being sealed by liquid.In this structure, when the vertical shielding device is working, the shaft inlet and outlet holes of the outer air blocking chamber are sealed by liquid. Therefore, after the liquid outside the outer air blocking chamber enters the outer air blocking chamber through the shaft inlet and outlet holes, it can gradually compress the internal gas of the outer air blocking chamber until the pressure of the gas is equal to the pressure of the liquid. After the pressure of the gas is equal to the pressure of the liquid, the liquid level in the outer air blocking chamber will no longer rise. After the liquid level stops, the magnetic fluid sealing device and the liquid can always be separated by the compressed gas. In this way, the liquid is blocked by the compressed gas in the outer air blocking chamber. This blocking effect of the gas on the liquid is what the present application calls air blocking. In this way, the magnetic fluid sealing device will not come into contact with the liquid through the air blocking of the outer air blocking chamber, thereby ensuring the working performance of the magnetic fluid sealing. Specifically, in the actual process, the pressure in the outer air blocking chamber can be reasonably set according to the pressure of the liquid, thereby reasonably controlling the liquid level height, so that the compressed gas inside the outer air blocking chamber can be used to isolate the magnetic fluid sealing device from the liquid in the fluid pumping device, etc. The air block protection device is used to further axially seal the magnetic fluid sealing device by forming an air block in the outer air block cavity and before the magnetic fluid sealing device. In this way, after the shaft output end is connected to the fluid pumping device, etc., the liquid or volatile gas in the fluid pumping device can be prevented from contacting the magnetic fluid sealing device. In this way, the air block protection device can be used to protect the magnetic fluid sealing device, thereby ensuring that the magnetic fluid sealing device will not come into contact with water or volatile liquid media during operation, thereby ensuring the working performance of the magnetic fluid seal. Specifically, in this structure, the internal space of the magnetic fluid sealing device and the air blocking protection device can be directly or indirectly sealed and connected in the axial direction through the sealed non-connected connection between the outer air blocking cavity and the outer shell, the airtight connection between the magnetic fluid sealing device and the air blocking protection device, and the sealing of the through hole by the air blocking protection device. In this way, the internal space of the magnetic fluid sealing device and the internal space of the air blocking protection device can be connected to form a closed cavity during operation. In this way, during sealing and shielding, the gas in the closed cavity can be compressed by liquid pressure to form an air blockage in the closed cavity. In this way, the magnetic fluid sealing device can be protected by the air blockage formed by the air blocking protection device, thereby realizing the isolation of the magnetic fluid sealing device from the liquid outside the air blocking protection device.In this technical solution, a magnetic fluid sealing device, an external air blocking cavity and an air blocking protection device are used in combination, and the combined vertical shielding device has a completely leak-free sealing effect of the magnetic fluid sealing device, and can form a larger air blocking cavity by sealing the external air blocking cavity with external liquid during the sealing and shielding. At the same time, by sealing the lower end of the air blocking protection device with external liquid, the sealing of the closed cavity formed by the internal space of the magnetic fluid sealing device and the internal space of the air blocking protection device can be achieved. In this way, the closed cavity is sealed by the external liquid. The compression of the gas inside can make the sealed cavity form a smaller air-blocking cavity. In this way, the air blocking of the inner and outer double-layer air-blocking cavities ensures that the magnetic fluid sealing device will not come into contact with the liquid during use, so that the vertical shielding device can be used for sealing and shielding the drive shaft of a water pump, etc., and this vertical shielding device also achieves efficient and leak-free sealing and shielding performance, achieving true zero leakage, solving the leakage problem of axial sealing that cannot be achieved by the existing technology, as well as the problem of being unable to achieve efficient and leak-free working conditions when transporting toxic, harmful, flammable, explosive, easy to crystallize, granular and other media. In addition, this structure can also block external water vapor, acid and alkali and other corrosive gases through the external air-blocking cavity and the air-blocking protection device, preventing water vapor, acid and alkali and other corrosive gases from acting on the magnetic fluid and entering the shell, thereby preventing the magnetic fluid and the components inside the shell from being corroded by water vapor, acid and alkali and other corrosive gases. When the vertical shielding device is used to seal the drive shaft of a fluid pumping device, etc., the sealing and shielding effect of the fluid pumping device, etc. is ensured, so that the fluid pumping device, etc. can achieve high efficiency and zero leakage.

[0036] The magnetic fluid seal can be installed inside the housing. In this case, the housing and its internal structure need to be adaptively adjusted. This arrangement allows the magnetic fluid seal to be installed inside the housing of the shaft itself, allowing the magnetic fluid seal to be completely isolated from the liquid by means of the external air blocking cavity. This further reduces the probability of contact between the magnetic fluid seal and liquids such as water, ensuring the working performance of the magnetic fluid seal and, in turn, ensuring a completely leak-free sealing effect for the entire vertical shielding device.

[0037] Of course, in other embodiments, the magnetofluid sealing device can also be installed in the external air blocking cavity. In this case, there is no need to change the structure of the outer shell and the interior of the outer shell. It is only necessary to install the vertical shielding device at the output end of the shaft. In this way, the vertical shielding device can be directly used for existing shaft products without the need for major changes to the existing shaft products. In this way, while ensuring that the existing shaft products are efficient and leak-free, the modification cost of the existing shaft products can be reduced, which is more conducive to the promotion and application of the vertical shielding device, thereby enhancing the market competitiveness of the vertical shielding device.

[0038] The second aspect of the present invention provides a shielded motor, comprising: a motor assembly, the motor assembly comprising a motor housing and a motor shaft; a vertical shielding device provided by any embodiment of the first aspect, the first end of the outer air blocking cavity of the vertical shielding device being sealedly connected to the motor housing, and a through hole for the motor shaft to pass through is provided between the motor housing and the outer air blocking cavity; wherein the input end of the motor shaft is installed in the motor housing, and the output end of the motor shaft passes through the motor housing through the through hole and is inserted into the outer air blocking cavity.

[0039] According to an embodiment of the present invention, a shielded motor is provided, comprising a motor assembly and the vertical shielding device provided in any embodiment of the first aspect. During installation, the motor housing of the motor assembly can be sealedly connected to the first end of the external air blocking cavity of the vertical shielding device, and the output end of the motor shaft can be inserted into the external air blocking cavity through the through-hole at the connection between the motor housing and the external air blocking cavity. This structure can utilize the vertical shielding device provided in any embodiment of the first aspect to seal and shield the motor shaft, and thus has the beneficial effects of the vertical shielding device provided in any embodiment of the first aspect, which will not be further elaborated here.

[0040] Further preferably, the shielded motor is a pressure-bearing motor, that is, a motor with adjustable gas pressure in the motor housing.

[0041] Furthermore, the motor assembly includes a motor rotor and stator assembly disposed within the motor housing, and the motor rotor and stator assembly are used to drive the motor shaft in rotation. Furthermore, a magnetic isolation device, such as a magnetic isolation plate or magnetic isolation sleeve, is also disposed within the motor housing. This device prevents the magnetic field generated by the motor rotor and stator assembly during operation from affecting the seal of the magnetic fluid seal device.

[0042] According to a third aspect of the present invention, an embodiment provides a canned motor pump, comprising: the canned motor provided by any embodiment of the second aspect; and a pump, airtightly mounted at the shaft inlet and outlet of the outer air blocking chamber, wherein the rotating portion of the pump is connected to the motor shaft of the canned motor. Preferably, the motor shaft is inserted into the rotating portion of the pump for connection; however, the connection between the rotating portion and the motor shaft can also be achieved through an intermediate shaft.

[0043] The shielded pump provided according to the embodiment of the present invention can utilize the shielded motor provided in any embodiment of the second aspect to drive the pump. Therefore, it has the beneficial effects of the shielded motor provided in any embodiment of the second aspect, which will not be repeated here.

[0044] It should be understood that the contents described in the disclosure section are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic structural diagram of a vertical shielding device provided in a first embodiment of the present invention;

[0046] Figure 2 A schematic structural diagram of a vertical shielding device provided in accordance with a second embodiment of the present invention;

[0047] Figure 3 A schematic structural diagram of a vertical shielding device provided in a third embodiment of the present invention;

[0048] Figure 4 A schematic structural diagram of a vertical shielding device provided in accordance with a fourth embodiment of the present invention;

[0049] Figure 5 A schematic structural diagram of a vertical shielding device provided in accordance with a fifth embodiment of the present invention;

[0050] Figure 6 for Figure 5 Schematic diagram of the local enlarged structure at A in the figure.

[0051] in, Figures 1 to 6 The corresponding relationship between the reference numerals and component names is as follows:

[0052] 1 shaft, 2 outer shell, 22 outer shell sleeve, 24 outer shell end cover, 3 outer gas plug cavity, 30 inner cavity, 32 outer gas plug sleeve, 34 gas sealing end cover, 4 through hole, 5 magnetic fluid sealing device, 62 first gas plug protection device, 622 inner gas plug cover, 624 separation device, 626 water retaining device, 64 packingless sealing device, 66 lubrication device, 662 medium injection pipe, 664 fabric hose, 72 bearing seat, 74 bearing, 8a magnetic isolation sleeve, 8b magnetic isolation plate. DETAILED DESCRIPTION

[0053] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0054] like Figures 1 to 6 As shown, the vertical shielding device provided according to the technical solution of the first aspect of the present invention is used to seal a vertically arranged shaft 1, wherein a shell 2 is provided outside the shaft 1, and the vertical shielding device includes an outer air blocking cavity 3 and a magnetic fluid sealing device 5, wherein,

[0055] The outer air blocking cavity 3 is vertically arranged along the axial direction, and the first end of the outer air blocking cavity 3 is sealed with the outer shell 2, a through hole 4 is provided between the outer shell 2 and the outer air blocking cavity 3, and an axial inlet and outlet hole is provided on the second end of the outer air blocking cavity 3;

[0056] A magnetic fluid sealing device 5 is installed at the through hole 4 to seal the through hole 4;

[0057] One end of the shaft 1 is located in the housing 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 .

[0058] According to an embodiment of the present invention, a vertical shielding device is provided for sealing a vertically arranged shaft 1, and one end of the vertically arranged shaft 1 is installed in a housing 2, and one end of the shaft 1 extends from one end of the housing 2 to the outside of the housing 2. The vertical shielding device includes an outer air blocking cavity 3 sealed with the housing 2, and a magnetic fluid sealing device 5 for magnetically sealing the shaft 1, wherein the shaft seal extending from the housing 2 is inserted and installed in the outer air blocking cavity 3, and then extends from the shaft inlet and outlet hole at the second end of the outer air blocking cavity 3. The magnetic fluid sealing device 5 is a zero-leakage dynamic seal. On the one hand, it can dynamically seal the shaft 1, and on the other hand, the magnetic fluid sealing device 5 can also seal the through hole 4. In this way, the magnetic fluid sealing device 5 can be used to strictly seal the upper end of the outer air blocking cavity 3, thereby forming airtightness, so that the upper end of the outer air blocking cavity 3 can seal the gas. When installing, the magnetic fluid sealing device 5 can be installed in the outer air blocking cavity 3 or in the housing 2 according to actual needs. The first end of the outer air blocking chamber 3 is used for sealing installation with the outer shell 2, and after the through hole 4 is sealed by the magnetic fluid sealing device 5, the first end of the outer air blocking chamber 3 forms airtightness, and the second end of the outer air blocking chamber 3 can be airtightly connected to all rotating equipment such as water pumps that need to be sealed, and the internal cavity 30 of the outer air blocking chamber 3 is completely sealed except for the shaft inlet and outlet, and is not connected to the interior of the outer shell 2, so that an independent air blocking chamber can be formed around the output end of the shaft 1. In this structure, when the vertical shielding device is working, the through hole on the upper part of the outer air blocking chamber 3 is sealed by the magnetic fluid sealing device 5, thereby forming airtightness, and the shaft inlet and outlet holes of the outer air blocking chamber 3 are sealed by liquid, so that the outer air blocking chamber 3 is sealed to form a very good airtight structure. Therefore, after the liquid outside the outer air blocking chamber 3 enters the outer air blocking chamber 3 through the shaft inlet and outlet holes, the gas inside the outer air blocking chamber 3 cannot leak, so that the liquid entering from the outside can only gradually compress the internal gas of the outer air blocking chamber 3 until the pressure of the gas is equal to the pressure of the liquid, and when the pressure of the gas is equal to the pressure of the liquid, the gas pressure is equal to the pressure of the liquid. After the pressure of the liquid is equal, the liquid level in the outer air blocking chamber 3 will no longer rise. After the liquid level stops, the magnetic fluid sealing device 5 and the liquid can always be separated by the compressed gas. In this way, the liquid is sealed by the compressed gas in the outer air blocking chamber 3. This blocking effect of the gas on the liquid is what the present application calls an air blockage. In this way, the magnetic fluid sealing device 5 will not come into contact with the liquid through the air blockage of the outer air blocking chamber 3, thereby ensuring the working performance of the magnetic fluid sealing device 5, so that the vertical shielding device can be used for sealing and shielding the drive shaft 1 of a water pump, etc. At the same time, this vertical shielding device also achieves efficient and leak-free sealing and shielding performance through the magnetic fluid sealing device 5 and the outer air blocking chamber 3, achieving true zero leakage.

[0059] Specifically, in the actual process, the pressure inside the external air blocking chamber 3 can be reasonably set according to the pressure of the liquid, so as to reasonably control the liquid level height, so that the compressed gas inside the external air blocking chamber 3 can be used to isolate the magnetic fluid sealing device 5 from the liquid in the fluid pumping device, etc.

[0060] Among them, such as Figure 1 、 Figure 2 and Figure 5 As shown, the magnetic fluid sealing device 5 can be installed in the housing 2. In this case, the structure of the housing 2 and its interior needs to be adaptively adjusted. This arrangement allows the magnetic fluid sealing device 5 to be installed inside the housing 2 provided by the shaft 1, so that the magnetic fluid sealing device 5 can be completely isolated from the liquid by means of the external air blocking cavity 3. This can further reduce the probability of the magnetic fluid sealing device 5 coming into contact with liquids such as water, ensure the working performance of the magnetic fluid seal, and further ensure a completely leak-free sealing effect for the entire vertical shielding device.

[0061] Of course, in other embodiments, such as Figure 3 and Figure 4 As shown, the magnetic fluid sealing device 5 can also be installed in the outer air blocking cavity 3. At this time, there is no need to change the structure of the outer shell 2 and the interior of the outer shell 2. It is only necessary to install the vertical shielding device at one end of the shaft 1. In this way, the vertical shielding device can be directly used for existing shaft products without the need for major changes to the existing shaft products. In this way, while ensuring that the existing shaft products are efficient and leak-free, the modification cost of the existing shaft products can be reduced, which is more conducive to the promotion and application of the vertical shielding device, thereby enhancing the market competitiveness of the vertical shielding device.

[0062] Further preferably, the vertical shielding device also includes: an air-blocking protection device, which is installed in the outer air-blocking cavity 3 and is air-tightly connected to the lower end of the magnetic fluid sealing device 5 in the axial direction, and the air-blocking protection device is arranged around the outside of the portion of the shaft 1 extending into the outer air-blocking cavity 3; wherein, the magnetic fluid sealing device 5 is installed in the outer 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 air-tightly connected. Or the magnetic fluid sealing device 5 is installed in the air-blocking cavity and seals the through hole 4, and the air-blocking protection device is installed at the lower end of the magnetic fluid sealing device 5 and is sealed and fixedly connected to the magnetic fluid sealing device 5. Wherein, the air-blocking protection device may specifically include Figure 1 and Figure 3 The first gas blocking protection device composed of the inner gas blocking cover 622 and the separation device 624, or can be specifically Figure 2 and Figure 4 Another first air blocking protection device composed of the inner air blocking cover 622 and the water blocking device 626 can also be Figure 5 The packingless seal device 64 in.

[0063] In this embodiment, the vertical shielding device also includes an air-blocking protection device, and the air-blocking protection device is air-tightly connected to the lower end of the magnetic fluid sealing device 5 in the axial direction, so that the upper end of the air-blocking protection device can be sealed by the magnetic fluid sealing device 5 to form air-tightness. In this way, after the air-blocking protection device is sealed by liquid at its lower end, it can lock the gas. In this way, after the liquid outside the air-blocking protection device enters the air-blocking protection device, the gas inside the air-blocking protection device cannot leak. In this way, the liquid entering from the outside can only gradually compress the internal gas of the air-blocking protection device, thereby forming an air blockage in the air-blocking protection device. In this way, the air blockage formed in the air-blocking protection device can further axially seal the magnetic fluid sealing device 5 in the outer air-blocking cavity 3. In this way, after the shaft 1 is connected to the fluid pumping device, etc., the liquid or volatile gas in the fluid pumping device, etc. can be prevented from contacting the magnetic fluid sealing device 5. In this way, the air blockage formed by the air-blocking protection device can protect the magnetic fluid sealing device 5, thereby achieving isolation of the magnetic fluid sealing device 5 from the liquid outside the air-blocking protection device. This structure combines the magnetic fluid sealing device 5, the external air blocking cavity 3 and the air blocking protection device for use. The combined vertical shielding device has a completely leak-free sealing effect of the magnetic fluid sealing device 5, and can, during the sealing and shielding, seal the external air blocking cavity 3 with external liquid to form a larger air blocking cavity for the external air blocking cavity 3. At the same time, by sealing the lower end of the air blocking protection device with external liquid, the sealing of the closed cavity formed by connecting the internal space of the magnetic fluid sealing device 5 with the internal space of the air blocking protection device can be achieved. In this way, the compression of the gas in the closed cavity by the external liquid can form a smaller air blocking cavity for the closed cavity. In this way, the air blocking of the inner and outer double-layer air blocking cavities ensures that the magnetic fluid sealing device 5 will not come into contact with the liquid during use.

[0064] Specifically, if Figure 1 、 Figure 2 and Figure 5 As shown, when the magnetic fluid sealing device 5 is installed in the housing 2, the air blocking protection device is arranged close to the through hole 4 and seals the through hole 4, as shown in FIG. Figure 3 and Figure 4 As shown, when the magnetic fluid sealing device 5 is installed in the outer air blocking cavity 3 and blocks the through hole 4, the air blocking protection device is installed on the side of the magnetic fluid sealing device 5 away from the through hole 4 and is in sealing contact with the magnetic fluid sealing device 5, and the internal cavity 30 of the outer air blocking cavity 3 is not connected to the outer shell 2.

[0065] Specifically, if Figures 1 to 4As shown, the external air blocking cavity 3 includes at least a side wall and an internal cavity 30. The internal cavity 30 can be surrounded by the side wall and the outer shell 2. Of course, the external air blocking cavity 3 can also include a bottom structure and / or a top structure, and the bottom structure and / or the top structure make it easier to seal the external air blocking cavity 3 with the outer shell 2 or the outer shell 2 of the load device.

[0066] Further preferably, the gas in the outer gas blocking cavity 3 is air. In this way, the air in the outer gas blocking cavity 3 can form an isolation barrier for the external liquid, thereby preventing the magnetic fluid from contacting the liquid.

[0067] Preferably, the housing 2 is not connected to the external air blocking cavity 3, and the gas pressure within the housing 2 can be adjusted. This arrangement allows the pressure within the housing 2 to be adjusted. Specifically, for example, the vertical shielding device can be used to seal and shield the motor shaft of a pressure-bearing motor.

[0068] Among them, the vertical shielding device in the present application can itself withstand a certain pressure P (for example, about 2 kilograms). Therefore, when the liquid pressure on the inlet and outlet sides of the shaft is less than the pressure P, there is no need to fill the outer air blocking chamber 3 with gas to adjust the gas pressure inside it. For example, when the lower end of the vertical shielding device is connected to a self-priming pump, the pump inlet pressure is negative pressure, and therefore, it is less than the pressure P of the axial surface air-sealed shield. At this time, there is no need to set an air inlet and outlet channel on the outer air blocking chamber 3 to adjust its internal pressure. When the lower end of the vertical shielding device is connected to a backflow pump or a traditional shielded pump, the pump inlet pressure is generally large. At this time, on the one hand, the number of turns of the magnetic fluid sealing device 5 can be increased to increase the pressure P that the axial surface air-sealed shield can withstand. On the other hand, an air inlet and outlet channel can be set on the outer air blocking chamber 3 to adjust its internal pressure so that its internal pressure can be adjusted according to actual needs. In addition, when the vertical shielding device is used for a motor, in the case where the pressure on the inlet and outlet sides of the shaft is relatively high, the motor can be set to an airtight water-cooled motor. In this way, the pressure inside the motor can be adjusted to maintain a balance with the pressure on the inlet and outlet sides of the pump shaft to ensure that the liquid pressure does not exceed the gas pressure inside the vertical shielding device. In this way, the vertical shielding device can form an effective air blockage to ensure that the magnetic fluid sealing device 5 does not come into contact with the liquid.

[0069] In the above scheme, preferably, Figures 1 to 5 As shown, a bearing seat 72 is sealed and installed at the through hole 4, a bearing 74 is installed on the bearing seat 72, and the bearing 74 is sleeved and installed on the shaft 1. Figure 1 、 Figure 2 and Figure 5 As shown, the air blocking protection device is installed in the outer air blocking cavity 3 and is sealed with one end of the bearing seat 72, while the magnetic fluid sealing device 5 is installed in the housing 2 and is sealed with the side of the bearing seat 72 away from the through hole 4. In another embodiment, as Figure 3 and Figure 4As shown, a bearing seat 72 is sealed and installed at the through hole 4, a bearing 74 is installed on the bearing seat 72, and the bearing 74 is sleeved and installed on the shaft 1. The magnetic fluid sealing device 5 is installed in the outer air blocking cavity 3, and is located on the side of the air blocking protection device close to the through hole 4, and is sealed and connected to the bearing seat 72 at the through hole 4. The air blocking protection device is located on the side of the magnetic fluid sealing device 5 away from the bearing seat 72, and is sealed and connected to the end of the magnetic fluid sealing device 5 away from the bearing seat 72.

[0070] In this embodiment, a bearing seat 72 is sealed and installed at the through hole 4. The bearing seat 72 can be installed close to the outer shell 2 or close to the outer air blocking cavity 3. Of course, it can also be sealed and installed at the connection between the outer shell 2 and the outer air blocking cavity 3. A bearing 74 is installed on the bearing seat 72, and the bearing 74 is used to support the shaft 1. When the magnetic fluid sealing device 5 is installed in the outer shell 2, it is preferably installed above the bearing 74, that is, the bearing 74 is installed in the outer shell 2 close to the outer air blocking cavity 3, and the magnetic fluid sealing device 5 is installed on the side of the outer shell 2 relatively away from the outer air blocking cavity 3, and at the same time, the end faces of the magnetic fluid sealing device 5 and the bearing seat 72 that are close to each other are sealed and connected to each other, and the end faces of the bearing seat 72 and the air blocking protection device that are close to each other are also sealed and connected to each other. Of course, in another embodiment, the magnetic fluid sealing device 5 can also be installed in the outer air blocking cavity 3 and sealed and installed between the bearing seat 72 and the air blocking protection device, and the internal space of the bearing seat 72, the internal space of the magnetic fluid sealing device 5 and the internal space of the air blocking protection device are sealed and connected. By sealing and connecting the internal space of the bearing seat 72, the internal space of the magnetic fluid sealing device 5 and the internal space of the air blocking protection device, the internal space of the magnetic fluid sealing device 5, the internal space of the bearing seat 72 and the internal space of the air blocking protection device can form a sealed airtight cavity, and the opening of this airtight cavity is located on the side of the air blocking protection device close to the shaft inlet and outlet hole, and this opening is sealed by the air blocking protection device through air blocking, that is, the compressed air is used to isolate and block the liquid, so that the external liquid cannot pass through the compressed gas inside the closed cavity and contact the magnetic fluid sealing device 5, thereby effectively preventing the magnetic fluid sealing device 5 from contacting the liquid.

[0071] Furthermore, when the outer shell sleeve 22 of the outer shell 2 and the side wall of the outer air blocking cavity 3 are integrally formed, the bearing 74 can be directly sealed and installed at the connection between the outer shell sleeve 22 of the outer shell 2 and the side wall of the outer air blocking cavity 3. At this time, the upper and lower end faces of the bearing 74 are both sealed and connected to the magnetic fluid seal and the air blocking protection device.

[0072] Preferably, when the magnetic fluid seal 5 is installed in the housing 2, it is in sealed contact with the bearing 74 in the axial direction, and the bearing 74 is sealedly connected to the air blockage protection device. When the magnetic fluid seal 5 is installed in the outer air blockage cavity 3, the magnetic fluid seal 5 and the air blockage protection device are also in sealed contact.

[0073] In any of the above embodiments, preferably, the housing 2 and the side wall of the outer air blocking cavity 3 are an integrated structure (not shown in the figure of this embodiment), or as Figures 1 to 4 As shown, the side walls of the outer shell 2 and the outer air blocking cavity 3 are split structures, and a partition structure is provided between the side walls of the outer shell 2 and the outer air blocking cavity 3. The partition structure is provided with a through hole 4 for the shaft 1 to pass through, and the bearing seat 72 is sealed and installed at the through hole 4 and is sealed and connected to the partition structure.

[0074] In this embodiment, the side walls of the outer shell 2 and the outer air blocking cavity 3 are an integral structure. Specifically, the side walls of the outer shell 2 and the outer air blocking cavity 3 can be welded into an integral structure or can be an integrally formed structure. Preferably, the side walls of the outer shell 2 and the outer air blocking cavity 3 are integrally formed, that is, the side walls of the outer air blocking cavity 3 are preferably formed by extending the outer shell 2 forward, which can improve the connection sealing and connection reliability between the side walls of the outer shell 2 and the outer air blocking cavity 3. Of course, in another embodiment, the side walls of the outer shell 2 and the outer air blocking cavity 3 can also be a split structure that can be detachably connected. However, regardless of whether the side walls of the outer shell 2 and the outer air blocking cavity 3 are an integral structure or a split structure, a partition structure is provided between the side walls of the outer shell 2 and the outer air blocking cavity 3 so as to separate the interior of the outer shell 2 from the interior of the outer air blocking cavity 3, and a through hole 4 for the shaft 1 to pass through is provided on the partition structure, and the through hole 4 and the shaft 1 are in a sealed fit. The separation structure here can be the end portion of one end where the outer shell 2 and the outer air blocking cavity 3 are connected, or it can be the end portion structure of one end where the outer air blocking cavity 3 and the outer shell 2 are connected.

[0075] Preferably, the bearing seat 72 and the partition structure are an integral structure, or as Figure 3 and Figure 4 As shown, the bearing seat 72 is connected to a part of the structure of the separation structure to form an integral structure. Of course, in other solutions, the bearing seat 72 can also be as shown. Figure 1 、 Figure 2 and Figure 5 Shown is a structure completely separate from the partition structure.

[0076] In a specific embodiment, if Figures 1 to 5As shown, the side wall of the outer gas blocking cavity 3 is an outer gas blocking sleeve 32, and the portion connecting the outer gas blocking cavity 3 and the outer shell 2 is a gas sealing end cover 34 sealedly connected to the outer gas blocking sleeve 32. The outer shell 2 includes an outer shell end cover 24 and an outer shell sleeve 22. The outer shell end cover 24 is sealedly connected to the gas sealing end cover 34. One end of the outer shell sleeve 22 is sealed and mounted to the outer shell sleeve 22. The separation structure is composed of the gas sealing end cover 34 and the outer shell end cover 24. The through hole 4 passes through the gas sealing end cover 34 and the outer shell end cover 24. Figure 3 and Figure 4 As shown, the bearing seat 72 and the housing end cover 24 are an integral structure, or as shown in FIG. Figure 1 、 Figure 2 and Figure 5 As shown, the bearing seat 72 and the housing end cover 24 are a split structure with a sealed connection.

[0077] In another specific embodiment (not shown), the outer shell 2 and the sidewalls of the outer air-blocking cavity 3 are integrally formed as a one-piece sleeve structure, and the partition structure is a partition plate mounted within the one-piece sleeve structure, the partition plate being provided with a through hole 4 for the shaft 1 to pass through. Preferably, the outer shell 2 includes an outer shell sleeve 22, and the sidewalls of the outer air-blocking cavity 3 are formed as an outer air-blocking sleeve 32, and the outer shell sleeve 22 and the outer air-blocking sleeve 32 are integrally formed.

[0078] In any of the above embodiments, preferably, Figures 1 to 4 As shown, the air blocking protection device is a first air blocking protection device 62 , which includes an inner air blocking cover 622 , and a accommodating cavity that can be sealed by a medium entering the outer air blocking cavity 3 is formed between the inner air blocking cover 622 and the shaft 1 .

[0079] In these embodiments, the air blockage protection device is a first air blockage protection device 62, which includes an inner air blockage cover 622 that is sleeved and installed outside the portion of the shaft 1 located in the outer air blockage cavity 3. A accommodating cavity is formed between the inner air blockage cover 622 and the shaft 1, and the upper end of the inner air blockage cover 622 is in sealing contact with the bearing seat 72 or the magnetic fluid sealing device 5, so that the internal space of the inner air blockage cover 622 can be airtightly connected with the internal space of the bearing seat 72 or the internal space of the magnetic fluid sealing device 5. With this structure, when the vertical shielding device is working, the shaft inlet and outlet holes of the outer air blocking chamber 3 are sealed by liquid, so that the interior of the outer air blocking chamber 3 can be sealed by liquid to form a completely closed internal space. Therefore, after the liquid outside the outer air blocking chamber 3 enters the outer air blocking chamber 3 through the shaft inlet and outlet holes, it can gradually compress the internal gas of the outer air blocking chamber 3 until the pressure of the gas is equal to the pressure of the liquid. After the pressure of the gas is equal to the pressure of the liquid, the liquid level in the outer air blocking chamber 3 will no longer rise. At the same time, since the space in the inner air blocking cover 622 is smaller, the gas in the inner air blocking cover 622 is less likely to be compressed. Therefore, the liquid level in the outer air blocking chamber 3 will always be higher than the inner air blocking chamber 3. The liquid level of the blocking cover 622 is determined. After the bottom of the inner air blocking cover 622 is completely sealed by the liquid level and the liquid stops and remains unchanged, according to the principle of the diving bell, the external liquid can no longer enter the inner air blocking cover 622. In this way, the liquid can be blocked by the same principle as the diving bell. At this time, since the inner air blocking cover 622 is always filled with compressed gas, the compressed gas in the inner air blocking cover 622 can prevent the magnetic fluid sealing device 5 from contacting the liquid, thereby ensuring the working performance of the magnetic fluid sealing device 5, so that the vertical shielding device composed of the magnetic fluid sealing device 5, the external air blocking cavity 3 and the inner air blocking cover 622 can achieve a completely leak-free sealing effect.

[0080] In another embodiment, Figure 5As shown, the air blockage protection device is a second air blockage protection device, which includes a packingless sealing device 64. The packingless sealing device 64 includes an axially installed annular cavity and a plurality of sealing rings axially installed in the annular cavity. A pressing member for pressing the sealing ring against the side wall of the shaft 1 is also provided between the annular cavity and the sealing ring. The sealing ring and the side wall of the shaft 1 can be sealed by pressing the pressing member. In this structure, when the vertical shielding device is working, the shaft inlet and outlet holes of the outer air blocking chamber 3 are sealed by liquid. Therefore, after the liquid outside the outer air blocking chamber 3 enters the outer air blocking chamber 3 through the shaft inlet and outlet holes, it can gradually compress the internal gas of the outer air blocking chamber 3 until the pressure of the gas is equal to the pressure of the liquid. After the pressure of the gas is equal to the pressure of the liquid, the liquid level in the outer air blocking chamber 3 will not rise (in the actual process, the height of the packingless sealing device 64 can be reasonably set according to the pressure of the liquid, so that the liquid level in the outer air blocking chamber 3 will not exceed the packingless sealing device 64. In this way, after the liquid level stops, the magnetic fluid sealing device 5 and the liquid begin to The compressed gas can eventually be separated, thus preventing the magnetic fluid sealing device 5 from coming into contact with the liquid, thus ensuring the working performance of the magnetic fluid seal. At the same time, this packingless sealing device 64 has multiple sealing rings to block it. Therefore, it can also prevent water vapor or volatile media in the external air blocking cavity 3 from passing through the multiple sealing rings and contacting the magnetic fluid sealing device 5, thereby preventing the magnetic fluid sealing device 5 from being corroded and damaged by water vapor or corrosive gases such as strong acids, strong bases, and toxic and harmful substances. In this way, in addition to having the effect of efficient zero-leakage sealing and shielding, the vertical shielding device can also be used for sealing and shielding corrosive media such as acids and alkalis.

[0081] More preferably, Figure 5 and Figure 6As shown, the second gas blockage protection device further includes a lubricating device 66 that is sealably connected to the packingless sealing device 64. The lubricating device 66 includes a medium injection pipe 662 that communicates with the packingless sealing device 64. The lubricating device 66 is used to inject a lubricating medium such as grease into the packingless sealing device 64 through the medium injection pipe 662 to ensure lubrication of the packingless sealing device 64. A fabric hose 664 is disposed within the medium injection pipe 662. One end of the fabric hose 664 is mounted within the medium injection pipe 662 and sealably connected to the side wall of the medium injection pipe 662. The other end of the fabric hose 664 extends toward the packingless sealing device 64. After the medium injection pipe 662 stops injecting oil, the inner walls of the other end of the fabric hose 664 can tightly fit together to form a static seal. Because, after the fabric hose 664 is installed in the medium injection pipe 662, the medium injection pipe 662 is divided into two inner and outer cavities by the hose. When the pressure in the inner cavity (the cavity located near the packingless sealing device 64) is greater than the pressure in the outer cavity, the inner wall of the fabric hose 664 is squeezed, causing the interior to fit tightly together, forming a static seal. When oil injection is required, the injected oil can directly push open the inner walls of the fabric hose 664. In this way, the fabric hose 664 acts as a one-way valve in the medium injection pipe 662, so that after the lubricating device 66 stops injecting lubricating medium, the medium injection pipe 662 can be sealed and shielded, thereby preventing gas, etc. that has entered the packingless sealing device 64 from leaking through the medium injection pipe 662.

[0082] Further preferably, a blocking member, such as a cross-shaped rib, a cross-shaped rib, or a tongue, is provided within the medium injection tube 662. The blocking member is located at the end of the fabric hose 664 away from the packingless sealing device 64, and a flow channel is formed between the blocking member and the inner wall of the medium injection tube 662. The blocking member blocks the fabric hose 664 when it retracts toward the inlet of the medium injection tube 662 under pressure, preventing the blocking member from transitioning toward the inlet of the medium injection tube 662 under pressure. Simultaneously, the blocking member enhances the pressure-bearing capacity of the fabric hose 664. The flow channel ensures the normal flow of the medium within the medium injection tube 662. The fabric hose 664 can be mounted on the inner wall of the medium injection tube 662 or on the blocking member. Of course, the blocking member may not be provided during normal use.

[0083] Preferably, if Figures 1 to 4 As shown, the inner wall of the inner air blocking cover 622 near the shaft inlet and outlet hole is tapered, the accommodating cavity is a tapered cavity, and the cross-sectional area of the accommodating cavity gradually increases from the end away from the shaft inlet and outlet hole to the end close to the shaft inlet and outlet hole.

[0084] More preferably, Figures 1 to 4As shown, both the interior and exterior of the inner air blocking cover 622 are tapered structures that gradually expand outward from top to bottom. This allows the cross-sectional area of the inner air blocking cover 622 to gradually increase from top to bottom, thus preventing the inner air blocking cover 622 from siphoning and causing liquid leakage during sealing.

[0085] More preferably, Figure 1 、 Figure 2 and Figure 5 As shown, when the magnetic fluid sealing device 5 is installed in the housing 2 and is located on the input side of the bearing seat 72, the end of the inner gas blocking cover 622 away from the shaft inlet and outlet hole is provided with a fixing seat that is sealed and connected to the bearing seat 72. By providing the fixing seat, the upper end face of the inner gas blocking cover 622 can be conveniently sealed and connected to the lower end face of the bearing seat 72, so that a sealed and connected closed cavity can be formed between the internal spaces of the bearing seat 72, the inner gas blocking cover 622 and the magnetic fluid sealing device 5, so that the magnetic fluid sealing device 5 can be in contact with the liquid through the barrier formed by the compressed gas.

[0086] More preferably, Figure 3 and Figure 4 As shown, 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, the end of the inner air blocking cover 622 away from the shaft inlet and outlet hole is directly sealed and connected to the magnetic fluid sealing device 5.

[0087] In any of the above schemes, preferably, Figure 1 and Figure 3 As shown, the air blockage protection device also includes a separation device 624 installed on the shaft, and the separation device 624 is arranged in the end of the inner air blockage cover 622 away from the shaft inlet and outlet hole, and / or the air blockage protection device also includes a water retaining device 626, which is installed on the shaft and arranged on the side of the inner air blockage cover 622 close to the shaft inlet and outlet hole.

[0088] In this embodiment, when the air blockage protection device is a structure including an inner air blockage cover 622, in order to prevent water vapor, impurities, etc. from passing through the inner air blockage cover 622 and contacting the magnetic fluid sealing device 5, a separation device 624 is provided in the end of the inner air blockage cover 622 away from the shaft inlet and outlet hole. In this way, the water vapor, impurities, etc. entering the inner air blockage cover 622 can be separated from the gas through the adsorption effect of the separation device 624 and / or the centrifugal force during rotation, preventing water vapor, impurities, etc. from passing through the inner air blockage cover 622 and contacting the magnetic fluid sealing device 5. In this way, the magnetic fluid sealing device 5 can be further effectively protected by the separation device 624. In another embodiment, in order to prevent the medium inside and outside the external air blocking cavity from splashing into the inner air blocking cover 622, a water retaining device 626 capable of rotating with the shaft is provided on the side of the inner air blocking cover 622 near the shaft inlet and outlet hole. In this way, the blocking of the water retaining device 626 and the centrifugal force generated when the water retaining device 626 rotates can prevent the external liquid from entering the inner air blocking cover 622, so that the water retaining device 626 can further form an effective protection for the magnetic fluid sealing device 5. Among them, the separation device 624 and the water retaining device 626 can be provided with one of them as needed. Of course, the separation device 624 and the water retaining device 626 can also be provided at the same time. The separation device 624 and the water retaining device 626 can block external water vapor, acid and alkali and other corrosive gases, prevent water vapor, acid and alkali and other corrosive gases from acting on the magnetic fluid and entering the housing 2, thereby preventing the magnetic fluid and the components inside the housing 2 from being corroded by water vapor, acid and alkali and other corrosive gases. When the vertical shielding device is used to seal the drive shaft 1 of a fluid pumping device, etc., the sealing and shielding effect of the fluid pumping device, etc. is ensured, so that the fluid pumping device, etc. can achieve high efficiency and zero leakage, solving the leakage problem of axial sealing that cannot be achieved by the existing technology, as well as the problem that high efficiency and no leakage cannot be achieved in the working conditions of conveying toxic, harmful, flammable, explosive, easy to crystallize, granular and other media.

[0089] More preferably, Figure 1 and Figure 3 As shown, the end of the inner air blocking cover 622 away from the shaft inlet and outlet is a straight section, that is, the upper portion of the inner air blocking cover 622 is a straight section. The separation device 624 is a separation sleeve mounted within the straight section. The separation sleeve is made of a honeycomb or grid-like material. This can improve the separation sleeve's ability to absorb moisture, impurities, etc., thereby achieving a high adsorption capacity. Preferably, the separation sleeve is made of a material with good water absorption, such as silk.

[0090] Further preferably, the outer wall of the separation sleeve is arranged in a reverse spiral, so that the centrifugal force when the separation sleeve rotates and the gravity of water vapor, etc. can throw the water vapor and impurities entering the separation sleeve from the outlet of the inner air blocking cover 622 to the outside of the inner air blocking cover 622, thereby further improving the separation sleeve's blocking ability against water vapor and impurities, etc., and improving the safety protection level of the magnetic fluid sealing device 5.

[0091] More preferably, Figure 2 and Figure 4 As shown, the water retaining device 626 is a water retaining ring provided near the entrance of the inner air blocking cover 622. Of course, the water retaining device 626 may also be other structures.

[0092] In any of the above schemes, preferably, the vertical shielding device also includes: a magnetic isolation device, installed in the shell 2, fixed on the shaft 1, located at the upper end of the magnetic fluid sealing device 5 or covered and installed outside the upper end of the magnetic fluid sealing device 5.

[0093] In these embodiments, by providing a magnetic isolation device, it is possible to prevent other magnetic fields inside the housing 2 from acting on the magnetic fluid sealing device 5, thereby interfering with the magnetic fluid seal, affecting its use effect or even rendering it ineffective. 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, a magnetic isolation device can be used to isolate the magnetic field to avoid magnetic field interference. Specifically, for example, when the vertical shielding device is used for a motor, since the motor will generate a magnetic field when it is working, this magnetic field will interfere with the magnetic fluid seal, affecting its use effect or even rendering it ineffective. Therefore, when this device is installed close to the motor, a magnetic isolation device can be provided at one end of the magnetic fluid sealing device 5 away from the air blockage protection device, that is, above the magnetic fluid sealing device 5, to isolate the magnetic field of the motor. Of course, when this device is not installed close to a device that can generate a magnetic field, such as a motor, the use of the magnetic isolation device can also be cancelled. That is, in this application, it can be as follows Figure 1 、 Figure 2 and Figure 5 As shown, the magnetic isolation device is set as an optional accessory. In this case, the magnetic isolation device is represented by a dotted line in the figure. Of course, the magnetic isolation device can also be as shown in Figure 3 and Figure 4 It is set as a necessary part. In this case, the magnetic isolation device is represented by a solid line in the figure.

[0094] In any of the above embodiments, preferably, the vertical shielding device further comprises: a shielding device, which is installed in the housing 2, fixed on the shaft 1, and located at the upper end of the magnetic fluid sealing device 5 or is installed outside the upper end of the magnetic fluid sealing device 5. The shielding device is used to protect the upper end of the magnetic fluid sealing device 5. In this way, when the bearings or other components at the upper end of the magnetic fluid sealing device 5 leak oil or water, the leaked oil or water can be blocked to prevent the leaked oil or water from damaging the magnetic fluid sealing device 5 from the upper end.

[0095] In a specific embodiment, if Figure 1 、 Figure 2 and Figure 5 As shown, a bearing seat 72 is sealed and mounted at the through hole 4, with a bearing 74 mounted on the bearing seat 72. A magnetic fluid seal 5 is mounted on the housing 2, and is located on the side of the bearing seat 72 within the housing 2 away from the external air blocking cavity 3. The magnetic isolation device is a magnetic isolation sleeve 8a mounted outside the magnetic fluid seal 5, and the end of the magnetic isolation sleeve 8a away from the bearing seat 72 is sealedly connected to the shaft 1. This structure enables the magnetic isolation sleeve 8a to isolate the external magnetic field, thereby preventing the external magnetic field from interfering with the magnetic fluid and affecting the seal.

[0096] In another specific embodiment, Figure 3 and Figure 4 As shown, a bearing seat 72 is sealed and installed at the through hole 4, and a bearing 74 is mounted on the bearing seat 72. The magnetic fluid sealing device 5 is installed in the outer air blocking cavity 3 and is located on the side of the air blocking protection device away from the shaft inlet and outlet holes. 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 sleeved and installed on the shaft 1 and is located on the side of the bearing seat 72 in the housing 2 away from the outer air blocking cavity 3. In this arrangement, when the magnetic fluid sealing device 5 is installed in the outer air blocking cavity 3, a magnetic isolation plate 8b can be provided above the bearing seat 72 to prevent the magnetic field in the housing 2 from acting axially on the magnetic fluid sealing device 5 in the outer air blocking cavity 3.

[0097] Of course, in other embodiments, the structure and installation position of the magnetic isolation device can be adjusted according to actual needs and are not limited to the position and structure described in this application.

[0098] Preferably, the magnetic isolation device is made of a material with good isolation performance, such as lead or ceramic. In this case, the magnetic isolation device can be configured as a lead plate, a lead cover, or a ceramic plate, a ceramic cover. Of course, the magnetic isolation device can also be made of other materials with good magnetic isolation performance according to actual needs.

[0099] In the above embodiment, preferably, the gas pressure in the outer gas blocking chamber 3 can be adjusted. Specifically, an inlet and outlet gas channel is provided on the outer gas blocking chamber 3, and the gas pressure in the outer gas blocking chamber 3 can be adjusted by filling and discharging the inlet and outlet gas channels. With this arrangement, when the liquid to be pumped at the shaft output end has pressure, the liquid level in the outer gas blocking chamber 3 can be adjusted by adjusting the pressure in the outer gas blocking chamber 3 accordingly. This allows the vertical shielding device to have a certain pressure bearing capacity, and the pressure bearing capacity can be adjusted accordingly according to the pressure of the liquid to be sealed. In this way, the vertical shielding device can still ensure an efficient zero-leakage sealing and shielding effect in high-pressure situations. Of course, when the vertical shielding device is used in a medium sealing situation with low pressure, the pressure in the outer gas blocking chamber 3 can also be set to a fixed value. In this case, the pressure bearing capacity of the vertical shielding device is limited. Therefore, it is only suitable for situations where the external medium pressure is less than the limit pressure of the vertical shielding device.

[0100] Preferably, the outer air blocking chamber 3 is provided with an air inlet and outlet passage, and the gas pressure within the outer air blocking chamber 3 can be adjusted by filling and deflating the air in the air inlet and outlet passages. The outer housing 2 and the outer air blocking chamber 3 are not connected, and the gas pressure within the outer housing 2 can be adjusted. This arrangement allows the inner pressures of both the outer housing 2 and the outer air blocking chamber 3 to be independently adjusted. Furthermore, this arrangement allows the outer housing 2 itself to form a zero-leakage air cavity, thereby sealing the output end of the motor. Furthermore, this arrangement also achieves a seal on the first end of the outer air blocking chamber 3 through the outer housing 2.

[0101] In any of the above embodiments, preferably, the housing 2 is a motor housing, or the housing 2 is a sleeve installed outside the shaft.

[0102] In any of the above embodiments, preferably, the center line of the shaft 1 and the outer air blocking cavity 3 is set at a preset angle to the vertical direction, and the preset angle is greater than or equal to 0° and less than or equal to 20°. That is, the shaft 1 can be set vertically or slightly tilted at a small angle.

[0103] In any of the above embodiments, preferably, the magnetic fluid sealing device 5 and the shaft 1 are in dynamic sealing cooperation, which can reduce the wear between the magnetic fluid sealing device 5 and the shaft 1.

[0104] The second aspect of the present invention provides a shielded motor (not shown in the figure), comprising: a motor assembly, the motor assembly including a motor housing and a motor shaft; a vertical shielding device provided by any embodiment of the first aspect, the first end of the external air blocking cavity 3 of the vertical shielding device is sealed with the motor housing, and a through hole 4 for the power supply shaft to pass through is provided between the motor housing and the external air blocking cavity 3; wherein, the input end of the motor shaft is installed in the motor housing, and the output end of the motor shaft passes through the motor housing through the through hole and is inserted into the external air blocking cavity 3.

[0105] According to an embodiment of the present invention, a shielded motor is provided, comprising a motor assembly and the vertical shielding device provided by any one of the embodiments of the first aspect. During installation, the motor housing of the motor assembly can be sealedly connected to the first end of the outer air blocking cavity 3 of the vertical shielding device, and the output end of the motor shaft is inserted into the outer air blocking cavity 3 through the through hole 4 at the connection between the motor housing and the outer air blocking cavity 3. At the same time, all rotating equipment that needs to be sealed is airtightly connected to the second end of the outer air blocking cavity 3. This structure can utilize the vertical shielding device provided by any one of the embodiments of the first aspect to perform axial sealing and shielding on the motor shaft, and therefore has the beneficial effects of the vertical shielding device provided by any one of the embodiments of the first aspect, which will not be repeated here.

[0106] Further preferably, the shielded motor is a pressure-bearing motor, that is, a motor in which the gas pressure in the motor housing is adjustable.

[0107] Further preferably, as shown, a bearing assembly is further provided in the motor housing, with both ends of the bearing assembly being sealed against the air blockage protection device and the magnetic fluid sealing device 5, and the internal spaces of the bearing assembly, the air blockage protection device, and the magnetic fluid sealing device 5 being sealed and connected to each other to form a sealed and connected closed cavity. In this way, the air blockage formed by the closed cavity can prevent liquid outside the air blockage protection device from passing through the entire closed cavity and contacting the magnetic fluid sealing device 5. The bearing assembly here can be a single bearing or a structure including a bearing body and a bearing seat.

[0108] Further preferably, the vertical shielding device further comprises: a magnetic isolation device, which is installed in the motor housing and sleeved on the motor shaft, and is located at one end of the magnetic fluid sealing device 5 away from the air blocking protection device, or is covered and installed outside the magnetic fluid sealing device 5. Specifically, the magnetic isolation device can be specifically Figures 1 to 4 Magnetic isolation sleeve 8a or magnetic isolation plate 8b.

[0109] Furthermore, the motor assembly includes a motor rotor and stator assembly disposed within the motor housing, which are used to drive the motor shaft. Furthermore, a magnetic isolation device, such as a magnetic isolation plate 8b or a magnetic isolation sleeve 8a, is also disposed within the motor housing. This device prevents the magnetic field generated by the motor rotor and stator assembly during operation from affecting the seal of the magnetic fluid seal 5.

[0110] Preferably, the motor is an airtight water-cooled motor, that is, a pressure-bearing motor whose internal pressure can be adjusted.

[0111] An embodiment of a third aspect of the present invention provides a canned motor pump, comprising: the canned motor provided by any embodiment of the second aspect; and a pump, airtightly mounted at the shaft inlet and outlet holes of the outer air blocking chamber 3, with the rotating portion of the pump connected to the motor shaft of the canned motor. Preferably, the motor shaft is inserted into the pump and connected to the rotating portion. Of course, the connection between the rotating portion and the motor shaft can also be achieved through an intermediate shaft.

[0112] The shielded pump provided according to the embodiment of the present invention can utilize the shielded motor provided in any embodiment of the second aspect to drive the pump. Therefore, it has the beneficial effects of the shielded motor provided in any embodiment of the second aspect, which will not be repeated here.

[0113] In this specification, the terms "connect," "install," and "fix" should be understood broadly. For example, "connect" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0114] Throughout this specification, terms such as "one embodiment" or "some embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0115] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0116] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A vertical shielding device for sealing a vertically arranged shaft, characterized in that: A housing is provided outside the shaft, and the vertical shielding device comprises: The outer air blocking cavity is vertically arranged along the axial direction, and the first end of the outer air blocking cavity is sealed with the outer shell, a through hole is provided between the outer shell and the outer air blocking cavity, and the second end of the outer air blocking cavity is provided with a shaft inlet and outlet hole; a magnetic fluid sealing device, installed at the through hole, for sealing the through hole, one end of the shaft is located in the housing, and the other end of the shaft passes through the magnetic fluid sealing device and extends into the outer air blocking cavity; An air blocking protection device is installed in the outer air blocking cavity and is airtightly connected to the lower end of the magnetic fluid sealing device in the axial direction. The air blocking protection device is arranged around the outside of the portion where the shaft extends into the outer air blocking cavity. In which, the magnetic fluid sealing device is installed 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 installed in the air blocking cavity and seals the via hole, and the air blocking protection device is installed at the lower end of the magnetic fluid sealing device and is sealed and fixedly connected to the magnetic fluid sealing device.

2. The vertical shielding device according to claim 1, characterized in that: A bearing seat is sealed and installed at the through hole, a bearing is installed on the bearing seat, and the bearing sleeve is installed on the shaft; The gas blockage protection device is installed in the outer gas blockage cavity and is sealed with one end of the bearing seat, and the magnetic fluid sealing device is installed in the outer shell and is sealed with one end of the bearing seat away from the gas blockage protection device, or The magnetic fluid sealing device is installed in the outer air blocking cavity, and the end of the magnetic fluid sealing device close to the bearing seat is sealed with the bearing seat. The air blocking protection device is located on the side of the magnetic fluid sealing device away from the bearing seat, and is sealed with the end of the magnetic fluid sealing device away from the bearing seat.

3. The vertical shielding device according to claim 2, characterized in that: The outer shell and the side wall of the outer air blocking cavity are an integral structure, or the outer shell and the side wall of the outer air blocking cavity are a split structure, and a partition structure is provided between the outer shell and the side wall of the outer air blocking cavity, and the partition structure is provided with the through hole for the shaft to pass through, and the bearing seat seal is installed at the through hole and is sealed and connected to the partition structure.

4. The vertical shielding device according to claim 3, characterized in that: The side wall of the outer gas blocking cavity is an outer gas blocking sleeve, the portion where the outer gas blocking cavity is connected to the outer shell is a gas sealing end cover that is sealed to the outer gas blocking sleeve, the outer shell comprises an outer shell end cover and an outer shell sleeve, the outer shell end cover is sealed to the gas sealing end cover, one end of the outer shell sleeve is sealingly mounted to the outer shell sleeve, the partition structure is composed of the gas sealing end cover and the outer shell end cover, the through hole passes through the gas sealing end cover and the outer shell end cover, the bearing seat and the outer shell end cover are an integrated structure, or the bearing seat and the outer shell end cover are a split structure that is sealed and connected; or The outer shell includes an outer shell sleeve, the side wall of the outer air blocking cavity is formed by an outer air blocking sleeve, and the outer shell sleeve and the outer air blocking sleeve are integrally formed.

5. The vertical shielding device according to claim 1, characterized in that: The gas blockage protection device includes a packingless sealing device sleeved and mounted outside the shaft and a lubricating device sealed with the packingless sealing device, the lubricating device including a medium injection pipe connected to the packingless sealing device, a fabric hose provided in the medium injection pipe, one end of the fabric hose installed in the medium injection pipe and sealed with the side wall of the medium injection pipe, and the other end of the fabric hose extending in a direction close to the packingless sealing device; wherein, after the lubricating device stops injecting the lubricating medium, the inner walls of the other end of the fabric hose can be closely fitted together to form a static seal; or The air blocking protection device includes an inner air blocking cover installed in the outer air blocking cavity and sleeved on the outside of the shaft, and an accommodating cavity that can be sealed by a medium entering the outer air blocking cavity is formed between the inner air blocking cover and the shaft.

6. The vertical shielding device according to claim 5, characterized in that: The inner wall of the inner air blocking cover at one end close to the shaft inlet and outlet hole is tapered, the accommodating cavity is a tapered cavity, and the cross-sectional area of the accommodating cavity gradually increases from the end away from the shaft inlet and outlet hole to the end close to the shaft inlet and outlet hole, the end of the inner air blocking cover at the end away from the shaft inlet and outlet hole is provided with a fixing seat, the inner air blocking cover seals the through hole through the fixing seat, or the end of the inner air blocking cover at the end away from the shaft inlet and outlet hole is directly sealed and connected to the magnetic fluid sealing device; and / or A separation device mounted on the shaft is provided in the end of the inner air blocking cover away from the shaft inlet and outlet hole, and / or a water retaining device is provided on the side of the inner air blocking cover close to the shaft inlet and outlet hole, and the water retaining device is mounted on the shaft.

7. The vertical shielding device according to claim 6, characterized in that: The end of the inner air blocking cover away from the shaft inlet and outlet hole is a straight section, and the separation device is a separation sleeve installed in the straight section, wherein the separation sleeve is made of a honeycomb or grid-shaped material, and / or the outer side wall of the separation sleeve is arranged in a reverse spiral; and / or The water retaining device is a water retaining ring arranged near the entrance of the inner air blocking cover.

8. The vertical shielding device according to any one of claims 1 to 7, characterized in that: Also includes: A magnetic isolation device is installed in the housing, fixed on the shaft, and located at the upper end of the magnetic fluid sealing device or is mounted outside the upper end of the magnetic fluid sealing device; and / or The shielding device is installed in the housing, fixed on the shaft, and located at the upper end of the magnetic fluid sealing device or is installed outside the upper end of the magnetic fluid sealing device.

9. The vertical shielding device according to claim 8, characterized in that: A bearing seat is sealed and installed at the through hole, a bearing is installed on the bearing seat, and the bearing sleeve is installed on the shaft, wherein the magnetic fluid sealing device is installed in the outer air blocking cavity and seals the through hole, and the magnetic isolation device is a magnetic isolation plate installed in the outer shell, and the magnetic isolation plate sleeve is installed on the shaft and is located on the side of the bearing seat away from the outer air blocking cavity, or The magnetic fluid sealing device is installed in the outer shell and is located on the side of the bearing seat away from the external air blocking cavity. The magnetic isolation device is a magnetic isolation sleeve installed outside the magnetic fluid sealing device, and the magnetic isolation sleeve is sealed and connected to the shaft at one end away from the bearing seat.

10. The vertical shielding device according to any one of claims 1 to 7, characterized in that: The outer air blocking cavity is provided with an air inlet and outlet channel, and the gas pressure in the outer air blocking cavity can be adjusted by charging and discharging the air inlet and outlet channel; and / or The gas pressure within the housing is adjustable; and / or The housing is a motor housing, or the housing is a sleeve mounted outside the shaft; and / or The axis and the center line of the external air blocking cavity are arranged at a preset angle to the vertical direction, and the preset angle is greater than or equal to 0° and less than or equal to 20°; and / or The magnetic fluid sealing device and the shaft are in dynamic sealing cooperation.

11. A shielded motor, characterized in that: include: a motor assembly, the motor assembly comprising a motor housing and a motor shaft; The vertical shielding device according to any one of claims 1 to 10, wherein a first end of the outer air blocking cavity of the vertical shielding device is sealed to the motor housing, and a through hole for the motor shaft to pass through is provided between the motor housing and the outer air blocking cavity; The input end of the motor shaft is installed in the motor housing, and the output end of the motor shaft passes through the motor housing through the through hole and is inserted into the outer air blocking cavity.

12. A canned motor pump, characterized in that: include: The shielded motor according to claim 11; and The pump is airtightly mounted at the shaft inlet and outlet holes of the outer air blocking cavity, and the rotating part of the pump is connected to the motor shaft of the shielded motor.

Images