Gas blocking shielding device and vertical pump

Abstract

The invention discloses an air blocking shielding device and a vertical pump, wherein the air blocking shielding device comprises: a supporting portion provided with a through hole, wherein a rolling bearing is arranged near the through hole; a sealing protection member, which is located at one side of the rolling bearing and is sealed and connected to the supporting portion; a first air blocking shielding component, comprising a magnetic fluid sealing device and an air blocking device, wherein the magnetic fluid sealing device is located at the other side of the rolling bearing and is sealed and connected to the supporting portion or the sealing protection member, wherein the air blocking device is sealingly installed at a side of the magnetic fluid sealing device away from the rolling bearing, and one end of the shaft passes through the rolling bearing and the magnetic fluid sealing device and extends into the air blocking device; in this scheme, the magnetic fluid sealing device ensures zero leakage and dynamic sealing, and the air blocking device ensures that the magnetic fluid sealing device does not contact with liquid through air blocking, thereby realizing sealing and shielding on both sides of the rolling bearing, so that the rolling bearing can replace the water-guided bearing and be used in products such as long-axis pumps, thereby improving the service life of products such as long-axis pumps and reducing product costs.

Description

Technical Field

[0001] The invention relates to the technical field of axial surface sealing, and in particular to an air blocking shielding device and a vertical pump. Background Art

[0002] For products such as long-axis deep well pumps or long-axis submersible pumps, since they need to transport liquids such as water, in the fluid channel for transporting fluid, water-guided bearings are often used to support the shaft in the fluid channel. Water-guided bearings are sliding bearings, which have the disadvantages of high price, high failure rate and short service life. This also increases the cost and failure rate of products such as long-axis deep well pumps or long-axis submersible pumps that use water-guided bearings, and reduces the service life of these products using water-guided bearings. Rolling bearings have the disadvantages of being cheap, low cost and long service life, but since rolling bearings cannot be lubricated by water, when rolling bearings are directly used in occasions such as fluid channels, it is necessary to ensure the sealing and shielding of both sides of the rolling bearings, otherwise the liquid in the fluid channel will enter the rolling bearings. At the same time, in order to avoid wear of the shaft and the structure of the sealed rolling bearing, when sealing both sides of the bearing, at least one sealing structure must be ensured to be a dynamic seal. However, it is difficult to achieve zero leakage in the existing dynamic sealing structure, so it is impossible to achieve true sealing and shielding on both sides of the rolling bearing, which makes it impossible for the rolling bearing to truly replace the water-guided bearing to support the shaft in the fluid channel.

[0003] Therefore, how to design a sealing and shielding structure that can achieve true sealing and shielding on both sides of the rolling bearing and ensure that at least one point is a dynamic seal has become a problem that needs to be solved urgently. Summary of the invention

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

[0005] To achieve the above-mentioned purpose, the first aspect of the present invention provides an air blocking shielding device. The second aspect of the present invention provides a vertical pump.

[0006] The air blocking shielding device provided according to the technical solution of the first aspect of the present invention is used for sealing and shielding a rolling bearing, wherein the rolling bearing is used for supporting a vertically arranged shaft, wherein the air blocking shielding device comprises:

[0007] A support portion, wherein a through hole is provided on the support portion, and the rolling bearing is installed in the through hole or installed above the support portion;

[0008] A sealing protection member, located at one side of the rolling bearing and sealedly connected to the support portion;

[0009] The first air-blocking shielding assembly includes a magnetic fluid sealing device and an air-blocking device, wherein the magnetic fluid sealing device is located on the other side of the rolling bearing and is sealed with the support portion or the sealing protection component, and the air-blocking device is sealingly installed on the side of the magnetic fluid sealing device away from the rolling bearing to prevent the magnetic fluid sealing device from contacting the liquid, wherein one end of the shaft passes through the rolling bearing and the magnetic fluid sealing device.

[0010] Furthermore, the magnetic fluid sealing device and the shaft are in dynamic sealing cooperation, and the air blocking device and the shaft are in clearance cooperation.

[0011] In the present application, the magnetic fluid sealing device is directly or indirectly connected to the sealing protection member in an airtight manner. Specifically, the magnetic fluid sealing device is located on the other side of the rolling bearing, and can be directly and airtightly connected to the support portion or to the sealing protection member, so that the magnetic fluid sealing device and the sealing protection member can be directly or indirectly connected in an airtight manner.

[0012] In the above technical solution, preferably, a waterproof shell is provided outside the magnetic fluid sealing device, one end of the waterproof shell is sealed and fixed to the support part or the sealing protection member, and the other end of the waterproof shell is sealed and fixedly connected to the air blocking device.

[0013] In any of the above technical solutions, preferably, the gas blocking device includes a gas blocking cover, and the first end of the gas blocking cover is sealingly mounted on the side of the magnetic fluid sealing device away from the rolling bearing. Further preferably, a separation device mounted on the shaft is arranged inside the gas blocking cover, and the separation device is located on the side of the magnetic fluid sealing device away from the rolling bearing. Of course, in other solutions, the separation device may not be arranged inside the gas blocking cover.

[0014] In any of the above technical solutions, preferably, the sealing protection member is sealed and connected to the support portion from above the rolling bearing, and the upper end of the shaft passes through the rolling bearing and extends into the sealing protection member;

[0015] The magnetic fluid sealing device is located below the rolling bearing and is sealingly mounted on the support portion or the sealing protection member. The air block cover is a first air block cover that is at least partially sleeved outside the shaft. The upper end of the first air block cover is sealingly mounted to the lower end surface of the magnetic fluid sealing device. The lower end of the first air block cover extends downward in the axial direction. The separation device is arranged in the upper end of the first air block cover and is fixed to the first separation device on the shaft.

[0016] Further preferably, the shaft extends from the lower end of the first air blocking cover.

[0017] Further preferably, the inner cavity area of ​​the first air blocking cover increases gradually from top to bottom, increases in steps, or increases first and then remains unchanged.

[0018] Further preferably, the shaft extends from the lower end of the first air blocking cover, a water retaining structure is provided on the inner wall of the lower end of the first air blocking cover close to the port, and a reverse thread is provided on the side of the water retaining structure close to the shaft surface.

[0019] In another technical solution, preferably, a water retaining device is provided on the lower side of the first air blocking cover, and the water retaining device is installed on the shaft. The water retaining device is preferably a water retaining ring.

[0020] In any of the above technical solutions, preferably, the sealing protection member is a protective tube that is sleeved and installed outside the shaft and sealed with the support part from above the rolling bearing, and the end of the protective tube away from the support part is sealed, or the sealing protection member is a seat body or end cover installed on one side of the rolling bearing and capable of sealing one side of the rolling bearing.

[0021] In any of the above technical schemes, preferably, the air block cover is a second air block cover, the magnetic fluid sealing device is located on the upper side of the rolling bearing and is sealed and installed on the support part, the lower end cover of the second air block cover is arranged outside the end of the magnetic fluid sealing device away from the rolling bearing, and the upper end of the second air block cover is sealed and installed on the shaft, wherein a ventilation gap is arranged between the port at the lower end of the second air block cover and the magnetic fluid sealing device, and the distance between the inner side wall of the second air block cover and the magnetic fluid sealing device gradually increases from top to bottom or increases in steps or first increases and then remains unchanged, and the separation device is a second separation device arranged in the upper end of the second air block cover and fixed on the shaft.

[0022] Further preferably, the sealing protection member is an end cover located at the lower side of the rolling bearing and sealingly mounted to the support portion.

[0023] In a specific technical solution, preferably, the sealing protection member is a second air-blocking shielding component, the second air-blocking shielding component comprises a mounting seat, a sleeve and a third air-blocking cover which is open at both ends and hollow inside, the mounting seat is sleeved and installed outside the shaft, is located below the rolling bearing, and is sealed and connected to the support portion, the upper end of the sleeve is sleeved outside the shaft, and is sealed and fixedly connected to the mounting seat, the lower end of the sleeve extends downward in the axial direction, the third air-blocking cover is installed in the sleeve, and the upper and lower ends of the third air-blocking cover are both sealed and connected to the sleeve, the inner cavity area of ​​the third air-blocking cover increases from top to bottom, a third separation device is provided in the upper end of the third air-blocking cover, and the third separation device is fixedly installed on the shaft;

[0024] Among them, the lower end of the sleeve extends out of the lower end of the shaft by a preset length, the third air block cover is installed in the sleeve and is located below the lower end of the shaft, the third separation device is installed at the lower end of the shaft and extends into the third air block cover, or the other end of the sleeve is completely mounted outside the shaft.

[0025] In another technical solution, preferably, the sealing protection part is a third air blocking shielding assembly, and the third air blocking shielding assembly includes a mounting seat and a fourth air blocking cover which is open at both ends and hollow inside, the mounting seat is sleeved on the outside of the shaft, located below the rolling bearing, and is sealed and connected to the support part, the upper end of the fourth air blocking cover is sleeved on the outside of the shaft and is sealed and fixedly connected to the mounting seat, the lower end of the fourth air blocking cover is sleeved on the outside of the shaft and extends downward in the axial direction, the inner cavity area of ​​the fourth air blocking cover increases from top to bottom, and a fourth separation device is arranged in the upper end of the fourth air blocking cover, and the fourth separation device is fixedly mounted on the shaft.

[0026] In any of the above technical solutions, preferably, the support portion is a long strip structure arranged along the vertical direction, and the sealing protection member or the first air blocking shielding assembly is sealed and installed in the through hole of the support portion.

[0027] The air blocking shielding device provided by the present invention is used to seal and shield both sides of the rolling bearing on the vertically arranged shaft. Specifically, the rolling bearing is installed in the through hole of the support part or installed above the support part. The support part is preferably installed in the fluid channel, and the air blocking shielding device includes a first air blocking shielding component and a sealing protection component. The magnetic fluid sealing device of the first air blocking shielding component is installed on one side of the rolling bearing and is sealed with the support part, so that one side of the upper and lower sides of the rolling bearing is sealed by the magnetic fluid sealing device. The magnetic fluid sealing device is a zero-leakage dynamic seal, which can form a reliable seal on one side of the rolling bearing in combination with the shaft to prevent the rolling bearing from being exposed to the liquid. In this way, while ensuring the dynamic seal, it can achieve true sealing and shielding on one side of the rolling bearing, thereby ensuring zero leakage on one side of the rolling bearing. The air blocking device is installed on the side of the magnetic fluid sealing device away from the rolling bearing. After the lower end of the air blocking device is sealed by liquid, the internal space of the air blocking device is connected to the internal space of the magnetic fluid sealing device to form a closed cavity. In this way, the gas in the closed cavity can be compressed and blocked and isolated between the magnetic fluid sealing device and the liquid under the action of the external liquid pressure, so that an air blockage can be formed between the magnetic fluid sealing device and the liquid, so that the magnetic fluid sealing device can be isolated from the liquid in the air blocking device, so that the magnetic fluid sealing device can be effectively protected and ensure that the magnetic fluid sealing device will not contact water or volatile liquid media during operation, so that the working performance of the magnetic fluid sealing device can be guaranteed and the situation that the magnetic fluid sealing device fails or is damaged when it encounters water can be avoided. This structure effectively combines the magnetic fluid sealing device with the air blocking device, and uses the magnetic fluid sealing device to ensure the dynamic seal and the sealing shielding effect of the rolling bearing on one side and zero leakage, so that the rolling bearing can replace the water-guided bearing and be used in products such as long-axis pumps. At the same time, in this structure, since the magnetic fluid sealing device itself is a dynamic seal, and the air plugging device only needs to be sealed and connected with the magnetic fluid sealing device, and the inside of the magnetic fluid sealing device also needs to form a gas cavity, therefore, the magnetic fluid sealing device and the air plugging device are not required to be sealed and fitted with the shaft, so the gap between the magnetic fluid sealing device, the air plugging device and the shaft can be reasonably set according to actual needs, so that when the rolling bearing is sealed and shielded, it can be ensured that there is no transitional friction between the shaft and the magnetic fluid sealing device and the air plugging device, thereby ensuring the working performance of the shaft. The sealing protection component is used to seal the other side of the rolling bearing, and the sealing connection between the sealing protection part and the support part and other components is a static sealing connection. Therefore, the sealing shielding between the sealing protection part and the support part can be ensured through the existing sealing connection method, such as the method of screws plus sealing rings, so that the sealing shielding of the other side of the rolling bearing by the sealing protection component can be simply and conveniently realized based on static sealing.In this way, the rolling bearing can be completely sealed and shielded by the sealing protection component, the air blocking device and the support part to prevent the rolling bearing from contacting the liquid in the fluid channel, so that the rolling bearing can replace the water-guided bearing and be used to support the shaft in the fluid channel. Specifically, for example, the water-guided bearing of the long-axis pump can be replaced with a rolling bearing, and then the two sides of the rolling bearing can be sealed by the air blocking shielding device in the present application. As for the rolling bearing, it has the advantages of long life, low price and not easy to damage. Therefore, by replacing the water-guided bearing of the long-axis pump with a rolling bearing, the life of the long-axis pump and other products can be improved, and the cost and failure rate of the long-axis pump and other products can be reduced.

[0028] According to the technical solution of the second aspect of the present invention, a vertical pump is provided, that is, a long-axis pump arranged vertically, such as a long-axis deep well pump, a long-axis submersible pump, etc. Specifically, the vertical pump comprises:

[0029] Connecting pipe assembly;

[0030] A pump working section, one end of which is sealed and mounted to the connecting pipe assembly, a support portion is provided in the pump working section, and a through hole is provided on the support portion for the pump shaft to pass through;

[0031] The pump shaft passes through the connecting pipe assembly and is inserted into the pump working section via the through hole;

[0032] A protective tube, the protective tube is located in the connecting tube assembly and is installed outside the pump shaft, and the bottom of the protective tube is sealed and installed to the supporting portion;

[0033] A first air-blocking shielding assembly is located in the working section of the pump and is sleeved and installed on the pump shaft. The first air-blocking shielding assembly includes a first magnetic fluid sealing device and an air-blocking device. One end of the first magnetic fluid sealing device is sealingly connected to the protective tube. The air-blocking device is sealingly installed at one end of the first magnetic fluid sealing device away from the protective tube to prevent the first magnetic fluid sealing device from contacting the liquid.

[0034] A first rolling bearing is installed on a side of the first magnetic fluid sealing device away from the air blocking device, and is used to support the pump shaft.

[0035] In any of the above technical solutions, preferably, one or more rolling bearings for supporting the pump shaft are installed inside the protective tube and above the first rolling bearing.

[0036] In any of the above technical solutions, preferably, a waterproof shell is provided outside the first magnetic fluid sealing device, and the first magnetic fluid sealing device is sealed and fixed to the protective tube through the waterproof shell, and is sealed and fixedly connected to the air blocking device through the waterproof shell.

[0037] In any of the above technical solutions, preferably, the air blocking device includes a first air blocking cover, the upper end of which is sealed and mounted to the first magnetic fluid sealing device, and the lower end of the air blocking device is located between the pump shaft and the pump working section.

[0038] Further preferably, the upper end of the first air blocking cover is a straight section, and / or the inner cavity area of ​​the lower end of the first air blocking cover gradually increases from top to bottom, and the air blocking device also includes a first separation device, which is located between the inner wall of the upper end of the first air blocking cover and the pump shaft, and is fixedly installed on the pump shaft, the first separation device is made of a honeycomb or grid-shaped material, and / or a reverse thread is provided on the outer side wall of the first separation device.

[0039] In any of the above technical solutions, preferably, a water retaining structure is provided on the inner wall of the lower end of the first air blocking cover close to the port, and a reverse thread is provided on the side of the water retaining structure close to the pump shaft.

[0040] In any of the above technical solutions, preferably, the vertical pump is a long-axis submersible pump, the pump working section includes a guide vane body sealed to the connecting pipe assembly, the support portion is provided in the guide vane body, and the first air blocking shielding assembly is installed in the guide vane body.

[0041] In any of the above technical solutions, preferably, the vertical pump is a long-axis deep well pump, the connecting pipe assembly is a water pumping pipe assembly, the pump working section includes an impeller section assembly and an intermediate assembly connected to the water pumping pipe assembly and the impeller section assembly, the supporting part is provided in the intermediate assembly, and the first air blocking shielding assembly is installed in the intermediate assembly.

[0042] Further preferably, the vertical pump is a long-axis deep-well pump, and the long-axis deep-well pump further comprises:

[0043] A water inlet section assembly is sealed and connected to the lower end of the impeller section assembly, a bearing seat is arranged in the water inlet section assembly, and a through hole is arranged on the bearing seat;

[0044] A second rolling bearing is installed in the through hole, and the pump shaft extends from the impeller section assembly into the water inlet section assembly and passes through the second rolling bearing in the through hole;

[0045] A second air blocking shielding assembly, comprising a second magnetic fluid sealing device and a counter cover, wherein the second magnetic fluid sealing device is located above the bearing seat, sealed and installed to the bearing seat, and sleeved and installed outside the pump shaft, the lower end cover of the counter cover is arranged outside an end of the second magnetic fluid sealing device away from the bearing seat, and the upper end of the counter cover is sealed and installed on the pump shaft, wherein a ventilation gap is arranged between the port at the lower end of the counter cover and the second magnetic fluid sealing device, and the distance between the inner side wall of the counter cover and the second magnetic fluid sealing device gradually increases from top to bottom, and a second separation device fixedly installed on the pump shaft is arranged between the counter cover and the pump shaft;

[0046] A third air-blocking shielding assembly, the third air-blocking shielding assembly comprises a mounting seat, a sleeve and a second air-blocking cover which is open at both ends and hollow inside, the mounting seat is sleeved and installed outside the pump shaft, is located below the bearing seat and is sealed and installed to the bearing seat, and the upper end of the sleeve is sleeved and installed outside the pump shaft and is sealed and fixedly connected to the mounting seat, the lower end of the sleeve extends out of the lower end of the pump shaft by a preset length, the second air-blocking cover is installed in the sleeve, is located below the lower end of the pump shaft, and both ends of the second air-blocking cover are sealed and fixed to the inner wall of the sleeve, a third separation device is installed at the lower end of the pump shaft, and the third separation device extends into the upper end of the second air-blocking cover.

[0047] According to an embodiment of the present invention, a vertical pump is provided, comprising: a connecting pipe assembly and a pump working section which are sealed and connected to each other, and the pump shaft passes through the connecting pipe assembly from top to bottom, and passes through the pump working section from the through hole on the support part, and the protective tube is arranged in the connecting pipe assembly, and is sealed and installed on the upper side of the support part, so that the sealing shielding of the upper side of the first rolling bearing can be achieved through the sealed connection between the protective tube and the support part. A first air blocking shielding assembly which is sealed and connected to the protective tube is installed on the lower side of the first rolling bearing, and the first air blocking shielding assembly realizes the sealing shielding of the lower side of the rolling bearing through the first magnetic fluid sealing device and the air blocking device, wherein the first magnetic fluid sealing device is used to realize the sealing shielding of zero leakage, and the air blocking device can ensure that the first magnetic fluid sealing device does not contact the liquid through air blocking. Based on the first air blocking shielding assembly introduced in the first aspect, it can be known that this structure effectively combines the magnetic fluid sealing device with the air blocking device, so that the magnetic fluid sealing device can be used for the sealing shielding of the internal parts in the fluid cavity, thereby achieving the sealing shielding effect of the leakage of the internal parts in the fluid cavity while ensuring the dynamic seal. At the same time, this structure replaces the original water guide bearing with a rolling bearing, and since rolling bearings also have the advantages of long life and low price, by replacing the water guide bearing of the long shaft pump with a rolling bearing, the life of the long shaft pump and other products is also increased, and the cost and failure rate of the long shaft pump and other products are reduced. At the same time, since the protective tube and the pump shaft are sealed and shielded, one or more rolling bearings can be installed on the upper part of the protective tube to support the pump shaft.

[0048] 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 easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic structural diagram of a gas blocking shielding device provided in an embodiment of the present invention;

[0050] Figure 2 A schematic structural diagram of an air blocking shielding device provided in another embodiment of the present invention;

[0051] Figure 3 A schematic structural diagram of an air blocking shielding device provided in yet another embodiment of the present invention;

[0052] Figure 4 A schematic diagram of the structure of a multi-stage pump is provided for an embodiment of the present invention;

[0053] Figure 5 A schematic structural diagram of a vertical pump provided by an embodiment of the present invention;

[0054] Figure 6 for Figure 5A partial enlarged view of the middle A;

[0055] Figure 7 for Figure 6 An enlarged schematic diagram of a part of the structure;

[0056] Figure 8 A schematic structural diagram of a vertical pump provided in another embodiment of the present invention;

[0057] Fig. 9 for Figure 8 A partial enlarged view of point B in the middle;

[0058] Fig.10 for Figure 8 A partial enlarged view of point C in the middle.

[0059] in, Figures 1 to 10 The corresponding relationship between the reference numerals and component names in the figure is:

[0060] 1 rolling bearing, 2 shaft, 3 support part, 32 through hole, 4 first air blocking shielding assembly, 42 magnetic fluid sealing device, 422 waterproof shell, 44 first air blocking cover, 442 water retaining structure, 46 first separation device, 47 second separation device, 48 second air blocking cover, 49 water retaining ring, 5a protective pipe, 5b end cover, 6 second air blocking shielding assembly, 62 mounting seat, 64 sleeve, 66 third air blocking cover, 68 third separation device, 7 vertical pump, 70 pump shaft, 71 connecting pipe assembly, 72 pump working section, 720 support part, 7202 through hole, 722 first impeller section assembly, 724 guide vane body, 726 second impeller Wheel section assembly, 728 intermediate assembly, 73 protective tube, 74 first air blocking shielding assembly, 742 first magnetic fluid sealing device, 7422 waterproof shell, 744 first air blocking cover, 746 first separation device, 75 first rolling bearing, 76 water inlet section assembly, 760 bearing seat, 7602 through hole, 762 filter screen, 764 connecting section, 77 second rolling bearing, 78 second air blocking shielding assembly, 782 second magnetic fluid sealing device, 784 anti-outer cover, 786 second separation device, 79 third air blocking shielding assembly, 792 mounting seat, 794 sleeve, 796 second air blocking cover, 798 third separation device. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] like Figures 1 to 4As shown, the air blocking shielding device provided according to the embodiment of the first aspect of the present invention is used to seal and shield a rolling bearing 1, and the rolling bearing 1 is used to support a vertically arranged shaft 2, wherein the air blocking shielding device includes:

[0063] The support portion 3 is provided with a through hole 32, and the rolling bearing 1 is installed in the through hole 32, or installed above the support portion 3; wherein the support portion 3 here can be located in the fluid channel, in which case the entire air blocking shielding device is used to support the rolling bearing 1 on the shaft 2 in the fluid channel. Of course, in other embodiments, the support portion 3 can also be located in a non-fluid channel;

[0064] A sealing protection member, located at one side of the rolling bearing 1 and sealedly connected to the support portion 3;

[0065] The first air-blocking shielding assembly 4 comprises a magnetic fluid sealing device 42 and an air-blocking device, wherein the magnetic fluid sealing device 42 is located at the other side of the rolling bearing 1 and is airtightly connected to the support portion 3 or the sealing protection member, and the air-blocking device is sealingly installed on the side of the magnetic fluid sealing device 42 away from the rolling bearing 1 to prevent the magnetic fluid sealing device 42 from contacting the liquid, wherein one end of the shaft 2 passes through the rolling bearing 1 and the magnetic fluid sealing device 42 and extends into the air-blocking device;

[0066] The air blocking shielding device provided by the present invention is used to seal and shield both sides of the rolling bearing 1 on the vertically arranged shaft 2. Specifically, the rolling bearing 1 is installed in the through hole 32 of the support part 3 or installed above the support part 3. The support part 3 is preferably installed in the fluid channel, and the air blocking shielding device includes a first air blocking shielding component 4 and a sealing protection component. The magnetic fluid sealing device 42 of the first air blocking shielding component 4 is installed on one side of the rolling bearing 1 and is airtightly connected to the support part 3 or the sealing protection component, so that one side of the upper and lower sides of the rolling bearing 1 is sealed by the magnetic fluid sealing device 42. The magnetic fluid sealing device 42 is a zero-leakage dynamic seal, which can form a reliable seal on one side of the rolling bearing 1 in combination with the shaft 2 to prevent the rolling bearing 1 from being exposed to the liquid. In this way, while ensuring the dynamic seal, a true sealing shielding can be achieved on one side of the rolling bearing 1, thereby ensuring zero leakage on one side of the rolling bearing 1. The air blocking device is sealed and installed on the side of the magnetic fluid sealing device 42 away from the rolling bearing 1. Specifically, it can be sealed and fixed on the lower end surface of the magnetic fluid sealing device 42, or on the shaft extending from the upper side of the magnetic fluid sealing device 42. Since the magnetic fluid sealing device 42 has a very good sealing effect, the upper end of the air blocking device can be strictly sealed to seal the gas on the upper part of the air blocking device so that an air blockage can be formed in the air blocking device. In this way, after the lower end of the air blocking device is sealed by liquid, the internal space of the air blocking device is connected to the internal space of the magnetic fluid sealing device 42 to form a closed cavity. Under the action of external liquid pressure, the gas in the sealed cavity can be compressed and blocked between the magnetic fluid sealing device 42 and the liquid, so that an air blockage can be formed between the magnetic fluid sealing device 42 and the liquid, so that the magnetic fluid sealing device 42 can be isolated from the liquid in the air blockage device, so that the magnetic fluid device can be effectively protected, ensuring that the magnetic fluid sealing device 42 will not contact water or volatile liquid media during operation, so that the working performance of the magnetic fluid sealing device 42 can be guaranteed, and the magnetic fluid sealing device 42 can be prevented from failing or being damaged when it encounters water. This structure effectively combines the magnetic fluid sealing device 42 with the air blockage device, and uses the magnetic fluid sealing device 42 to ensure the dynamic seal and the sealing shielding effect of the rolling bearing 1 on one side and zero leakage, so that the rolling bearing 1 can replace the water-guided bearing and be used in products such as long-axis pumps. At the same time, in this structure, since the magnetic fluid sealing device 42 itself is a dynamic seal, and the air plugging device only needs to be sealed and connected to the magnetic fluid sealing device 42, and a gas cavity is also required to be formed inside it, therefore, neither the magnetic fluid sealing device 42 nor the air plugging device is required to be sealed and fitted with the shaft 2. Therefore, the gap between the magnetic fluid sealing device 42, the air plugging device and the shaft 2 can be reasonably set according to actual needs. In this way, when the rolling bearing 1 is sealed and shielded, it can be ensured that there will be no excessive friction between the shaft 2 and the magnetic fluid sealing device 42 and the air plugging device, thereby ensuring the working performance of the shaft 2.The sealing protection component is used to seal the other side of the rolling bearing 1, and the sealing connection between the sealing protection component and the support part 3 and other components is a static sealing connection. Therefore, the sealing shielding connection between the sealing protection component and the support part 3 can be ensured by the existing sealing connection method, such as the method of screw plus sealing ring, so that the sealing shielding of the other side of the rolling bearing 1 by the sealing protection component can be simply and conveniently realized based on static sealing. In this way, the rolling bearing 1 can be completely sealed and shielded by the sealing protection component, the air blocking device and the support part 3 to prevent the rolling bearing 1 from contacting the liquid in the fluid channel, so that the rolling bearing 1 can replace the water-guided bearing and be used for the support of the shaft in the fluid channel. Specifically, for example, the water-guided bearing of the long-axis pump can be replaced with the rolling bearing 1, and then the two sides of the rolling bearing 1 can be sealed by the air blocking shielding device in the present application. As for the rolling bearing 1, it has the advantages of long life, low price and not easy to damage. Therefore, by replacing the water-guided bearing of the long-axis pump with the rolling bearing 1, the life of the long-axis pump and other products can be improved, and the cost and failure rate of the long-axis pump and other products can be reduced.

[0067] Among them, the rolling bearing in the present application can be sealed by the structure on both sides, so when it is preferably used in a liquid environment, it can effectively achieve effective sealing and shielding of the rolling bearing, but in other non-liquid environments with strict requirements on the sealing structure, the structure can also be used to achieve sealing on both sides of the bearing. Of course, in any other ordinary environment, the structure can also be used to achieve sealing on both sides of the bearing based on other reasons. Therefore, in the present application, it is not required that the rolling bearing must be used in a liquid environment, that is, in the present application, the use occasions of the rolling bearing are not limited.

[0068] The magnetic fluid sealing device 42 is directly or indirectly connected to the sealing protection member in an airtight manner. In one embodiment, Figure 1 , Figure 3 and Figure 4 As shown, the magnetic fluid sealing device 42 is directly connected to the support portion 3 from one side of the rolling bearing 1. In another embodiment, as shown in FIG. Figure 2 As shown, the magnetic fluid sealing device 42 is sealedly connected to the sealing protection member from one side of the rolling bearing 1, wherein: Figure 2 The middle sealing protection member is a protection tube 5a.

[0069] In the above embodiment, preferably, Figures 1 to 4 As shown, a waterproof shell 422 is provided outside the magnetic fluid sealing device 42, one end of the waterproof shell 422 is sealed and fixed to the support part 3 or the sealing protection member, and the other end of the waterproof shell 422 is sealed and fixedly connected to the air blocking device.

[0070] In this embodiment, since the magnetic fluid sealing device 42 can be used in a fluid channel, a waterproof shell 422 is provided outside the magnetic fluid sealing device 42 to enhance the waterproof performance of the outside of the magnetic fluid sealing device 42. Of course, the provision of the waterproof shell 422 also facilitates the sealed connection and fixation between the magnetic fluid sealing device 42 and the support part 3 or the sealing protection part and the air blocking device.

[0071] Furthermore, the magnetic fluid sealing device 42 and the shaft 2 are in dynamic sealing cooperation, and the air blocking device and the shaft 2 are in clearance cooperation. This arrangement can reduce the friction between the magnetic fluid sealing device 42 and the air blocking device and the shaft 2, thereby reducing the wear of the shaft 2 during rotation.

[0072] In any of the above embodiments, preferably, Figures 1 to 3 As shown, the air blocking device includes an air blocking cover, and the first end of the air blocking cover is sealed and installed on the side of the magnetic fluid sealing device 42 away from the rolling bearing 1. Further preferably, a separation device installed on the shaft 2 is provided in the air blocking cover, and the separation device is located on the side of the magnetic fluid sealing device 42 away from the rolling bearing 1. Of course, in other schemes, the separation device may not be provided in the air blocking cover.

[0073] In a specific embodiment, preferably, Figures 1 to 3 As shown, the sealing protection member is sealed and connected to the support portion 3 from above the rolling bearing 1, and the upper end of the shaft 2 passes through the rolling bearing 1 and extends into the sealing protection member; the magnetic fluid sealing device 42 is located below the rolling bearing 1 and is sealed and installed on the support portion 3, and the air blocking cover includes a first air blocking cover 44 that is at least partially sleeved on the outside of the shaft 2, and the upper end of the first air blocking cover 44 is sealed and installed on the lower end surface of the magnetic fluid sealing device 42, and the lower end of the first air blocking cover 44 extends downward in the axial direction.

[0074] In this embodiment, since the shaft 2 is a vertically arranged shaft, it is necessary to seal and shield the upper and lower sides of the rolling bearing 1. Preferably, the sealing protection member can be sealed and connected to the support portion 3 from the top of the rolling bearing 1 to achieve the sealing and shielding of the upper side of the rolling bearing 1. The bottom of the rolling bearing 1 can be sealed and shielded by the magnetic fluid sealing device 42 and the first air blocking cover 44. Among them, the upper end of the first air blocking cover 44 is sealed and installed on the lower end surface of the magnetic fluid sealing device 42, so that the internal space of the magnetic fluid sealing device 42 and the internal space of the first air blocking cover 44 are airtightly connected in the axial direction. In this way, after the bottom of the first air blocking cover 44 is sealed, the internal space of the magnetic fluid sealing device 42 and the internal space of the first air blocking cover 44 will be connected to a closed cavity. Therefore, after the external liquid enters the first air blocking cover 44 from the bottom of the first air blocking cover 44, it will compress the gas in the first air blocking cover 44 until the liquid pressure in the first air blocking cover 44 is equal to the compressed gas pressure, and the gas in the first air blocking cover 44 is compressed. The liquid level will not rise, and after the liquid level stops, according to the principle of the diving bell, the external liquid can no longer enter the first air plug cover 44, so the liquid can be blocked by the same principle as the diving bell, so that the magnetic fluid sealing device 42 and the liquid can always be separated by the compressed gas, so that the liquid is blocked by the compressed gas in the first air plug cover 44, and this blocking effect of the gas on the liquid is what the application calls air blocking, so that the magnetic fluid sealing device 42 will not contact the liquid through the air plug of the first air plug cover 44, so that the working performance of the magnetic fluid sealing device 42 is guaranteed by the first air plug cover 44. And this structure realizes the sealing shielding of the lower side of the rolling bearing 1 through the effective combination of the magnetic fluid sealing device 42 and the first air plug cover 44, thereby ensuring zero leakage of the lower side of the rolling bearing 1.

[0075] Further preferably, the shaft 2 extends out from the lower end of the first air-blocking cover 44. That is, the first air-blocking cover 44 is completely covered outside the shaft 2, and in this case, the rolling bearing 1 can be installed in the middle of the shaft. However, preferably, a preset distance is set between the first air-blocking cover 44 and the shaft 2, so that the rotation of the shaft 2 is convenient and the wear between the shaft 2 and the first air-blocking cover 44 is reduced. Of course, the rolling bearing 1 can also be installed at the tail of the shaft 2, and in this case, the shaft 2 can extend from the lower end of the first air-blocking cover 44, and of course, the tail of the shaft 2 can also be located in the first air-blocking cover 44.

[0076] More preferably, if Figures 1 to 3 As shown, a first separating device 46 is provided in the upper end of the first air blocking cover 44, and the first separating device 46 is fixed on the shaft 2. Of course, when the gap between the upper end of the first air blocking cover 44 and the shaft 2 is small, the separating device may not be provided.

[0077] In this embodiment, in order to prevent water vapor, impurities, etc. from contacting the magnetic fluid sealing device 42 through the first air blocking cover 44, a first separation device 46 is provided in the upper end of the first air blocking cover 44, so that the water vapor, impurities, etc. entering the first air blocking cover 44 can be separated from the gas through the adsorption effect of the first separation device 46 and / or the centrifugal force during rotation, and the water vapor, impurities, etc. are prevented from passing through the first air blocking cover 44 and contacting the magnetic fluid sealing device 42, so that the magnetic fluid sealing device 42 can be further effectively protected by the first separation device 46. Of course, in order to prevent water vapor, impurities, etc. from contacting the magnetic fluid sealing device 42 through the first air blocking cover 44, a thickening structure can also be provided on the inner wall of the upper end of the first air blocking cover 44, and then the distance between the inner wall of the upper end of the first air blocking cover 44 and the shaft 2 can be reduced by the thickening structure, so that when the shaft rotates, the thickening structure can be used to isolate water vapor / reduce impurities, etc.

[0078] More preferably, if Figures 1 to 4 As shown, the inner cavity area of ​​the first air blocking cover 44 gradually increases from top to bottom or increases in steps or increases first and then remains unchanged. Of course, the inner cavity area of ​​the first air blocking cover 44 can also remain unchanged from top to bottom, or increase first and then decrease. But preferably, the inner cavity area of ​​the first air blocking cover 44 gradually increases from top to bottom, so that the area of ​​the upper end of the first air blocking cover 44 can be smaller, so that the higher the liquid level, the more difficult it is to compress the gas. Of course, this arrangement can also avoid the siphon phenomenon in the first air blocking cover 44.

[0079] More preferably, if Figure 1 As shown, a water retaining structure 442 is provided on the inner wall of the lower end of the first air blocking cover 44 close to the port, and a reverse thread is provided on one side of the water retaining structure 442 close to the axial surface.

[0080] In this embodiment, in order to reduce the amount of liquid outside the first air blocking cover 44 entering the first air blocking cover 44, a water retaining structure 442 can be set on the inner wall of the lower end of the first air blocking cover 44, and then the distance between the inner wall of the lower port of the first air blocking cover 44 and the shaft 2 can be reduced by the water retaining structure 442, so that when the shaft 2 rotates, the amount of external liquid entering the first air blocking cover 44 can be reduced by the water retaining structure 442. The reverse thread can press water downward, thereby further reducing the amount of external liquid entering the first air blocking cover 44. Among them, when the first air blocking cover 44 is used in an occasion with a large water pressure and the opening is in a water-facing position, a water retaining structure 442 with a reverse thread can be set at the lower end of the first air blocking cover 44, and when the first air blocking cover 44 is used in an occasion with a small water pressure, the water retaining structure 442 with a reverse thread may not be set at the lower end of the first air blocking cover 44.

[0081] In another embodiment, in order to reduce the amount of liquid outside the first air blocking cover 44 entering the first air blocking cover 44, as shown in FIG. Figure 4 As shown, a water retaining device 49 capable of rotating with the shaft 2 is provided at the lower end outlet of the first air blocking cover 44, so that the amount of external liquid entering the first air blocking cover 44 can be reduced by the blocking of the water retaining device 49 and the centrifugal effect generated when the water retaining device 49 rotates.

[0082] In any of the above embodiments, preferably, Figure 1 and Figure 2 As shown, the sealing protection member is a protective tube 5a which is sleeved and installed outside the shaft 2 and is sealed and connected to the support part 3 from above the rolling bearing 1. The side of the protective tube 5a away from the support part 3 is also in a sealed state, or as shown in FIG. Figure 4 As shown, the sealing protection member is a seat or end cover 5b installed on one side of the rolling bearing 1 and capable of sealing one side of the rolling bearing 1. In specific design, the structure of the sealing protection member on the upper side of the rolling bearing 1 can be reasonably set according to the specific structure of the product. When the structure is used for products such as long-axis pumps, it is preferred to set a protective tube 5a above the rolling bearing 1 to simultaneously achieve isolation protection of the rolling bearing 1 and the shaft 2.

[0083] In another specific embodiment, preferably, Figure 3 As shown, the air blocking cover includes a second air blocking cover 48, the magnetic fluid sealing device 42 is located on the upper side of the rolling bearing 1 and is sealed and installed on the support part 3, the lower end cover of the second air blocking cover 48 is arranged outside the end of the magnetic fluid sealing device 42 away from the support part 3, and the upper end of the second air blocking cover 48 is sealed and installed on the shaft 2, wherein a ventilation gap is arranged between the port at the lower end of the second air blocking cover 48 and the magnetic fluid sealing device 42, and the distance between the inner side wall of the second air blocking cover 48 and the magnetic fluid sealing device 42 gradually increases from top to bottom or increases in steps or first increases and then remains unchanged.

[0084] In this embodiment, the magnetic fluid sealing device 42 is located on the upper side of the rolling bearing 1 and is sealed and installed on the support part 3, so that the sealing shielding of the upper side of the rolling bearing 1 can be achieved. At this time, the second air block cover 48 can be used to prevent the magnetic fluid sealing device 42 from contacting the liquid. Specifically, the upper end of the second air block cover 48 can be fixed on the shaft 2 above the magnetic fluid sealing device 42, and the lower end cover of the second air block cover 48 can be arranged outside the magnetic fluid sealing device 42. In this way, based on the same principle as the first air block cover 44, an air block isolation can be formed around the magnetic fluid sealing device 42 through the second air block cover 48, so that the magnetic fluid sealing device 42 and the liquid can always be separated by compressed gas, so that the magnetic fluid sealing device 42 will not contact the liquid, and the working performance of the magnetic fluid sealing device 42 is guaranteed by the second air block cover 48.

[0085] More preferably, if Figure 3As shown, a second separation device 47 fixed to the shaft 2 is provided in the upper end of the second air blocking cover 48 , and the second separation device 47 is located on the top of the magnetic fluid sealing device 42 .

[0086] In a specific embodiment, if Figure 3 As shown, the air blocking device is a structure including a second separation device 47, a second air blocking cover 48 and a magnetic fluid sealing device 42, the sealing protection part is a second air blocking shielding assembly 6, the second air blocking shielding assembly 6 includes a mounting seat 62, a sleeve 64 and a third air blocking cover 66 with openings at both ends and a hollow interior, the mounting seat 62 is sleeved and installed outside the shaft 2, located below the rolling bearing 1, and is sealed and connected to the support part 3, the upper end of the sleeve 64 is sleeved outside the shaft 2, and is sealed and fixedly connected to the mounting seat 62, the lower end of the sleeve 64 extends downward in the axial direction, the third air blocking cover 66 is installed in the sleeve 64, and the third air blocking cover The upper and lower ends of 66 are sealed and connected to the sleeve 64. The inner cavity area of ​​the third air blocking cover 66 gradually increases from top to bottom or increases in steps or increases first and then remains unchanged. A third separation device 68 is arranged in the upper end of the third air blocking cover 66, and the third separation device 68 is fixedly installed on the shaft 2; wherein, preferably, the lower end of the sleeve 64 extends out of the lower end of the shaft 2 by a preset length, the third air blocking cover 66 is installed in the sleeve 64, and is located below the lower end of the shaft 2. The third separation device 68 is installed at the lower end of the shaft and extends into the third air blocking cover 66 (i.e., the rolling bearing 1 is installed at the tail of the shaft 2). Of course, in other embodiments, the other end of the sleeve 64 can also be completely sleeved and installed outside the shaft 2 (i.e., the rolling bearing 1 is not installed at the tail of the shaft).

[0087] In this embodiment, the lower part of the rolling bearing 1 is sealed and shielded by a second air-blocking shielding assembly 6 formed by a mounting seat 62, a sleeve 64 and a third air-blocking cover 66 with openings at both ends and a hollow interior. During operation, liquid enters the third air-blocking cover 66 from the lower end of the third air-blocking cover 66, and then compresses the internal air until the liquid pressure and gas pressure in the third air-blocking cover 66 are balanced. After the balance, the liquid level no longer rises. At this time, the liquid in the third air-blocking cover 66 is blocked by the compressed gas and cannot contact the lower end face of the rolling bearing 1. In this way, the sealing and shielding of the lower end face of the rolling bearing 1 is achieved through air blocking. Among them, the third separation device 68 is to prevent water vapor, impurities, etc. from passing through the third air-blocking cover 66 and contacting the rolling bearing 1. Its principle is the same as that of the first separation device 46, and it will not be introduced here.

[0088] Among them, in a preferred embodiment, if Figure 3 As shown, the first air blocking shielding assembly is a structure including the above-mentioned second separation device 47, the second air blocking cover 48 and the magnetic fluid sealing device 42. The magnetic fluid sealing device 42 is located on the upper side of the rolling bearing 1 and is sealed and installed on the support part 3. The sealing protection part is the above-mentioned second air blocking shielding assembly 6.

[0089] In a preferred embodiment, if Figure 4 As shown, the first air blocking shielding assembly is a structure including the second separation device 47, the second air blocking cover 48 and the magnetic fluid sealing device 42, and the sealing protection member is an end cover 5b located on the lower side of the rolling bearing and sealedly mounted to the support part.

[0090] In any of the above embodiments, preferably, the support portion 3 is a long strip structure arranged along the vertical direction, and the sealing protection member or the first air blocking shielding component 4 is sealed and installed in the through hole 32 of the support portion 3.

[0091] In this embodiment, the support portion 3 can be a relatively short structure, in which case the sealing protection member or the first air blocking shielding assembly 4 can be directly installed above or below the support portion 3. Of course, the support portion 3 can also be a relatively long structure, in which case the sealing protection member or the first air blocking shielding assembly 4 can be directly installed in the through hole 32 of the support portion 3 and sealed to the inner wall of the support portion 3.

[0092] In another specific embodiment, the sealing protection member is a third air-blocking shielding assembly (not shown in the figure), the third air-blocking shielding assembly includes a mounting seat and a fourth air-blocking cover with openings at both ends and a hollow interior, the mounting seat is sleeved and installed outside the shaft 2, located below the rolling bearing 1, and is sealed and connected to the support portion 3, the upper end of the fourth air-blocking cover is sleeved outside the shaft 2, and is sealed and fixedly connected to the mounting seat, the lower end of the fourth air-blocking cover is sleeved outside the shaft and extends downward in the axial direction, the inner cavity area of ​​the fourth air-blocking cover increases from top to bottom, and a fourth separation device is arranged in the upper end of the fourth air-blocking cover, and the fourth separation device is fixedly mounted on the shaft 2. This arrangement can form an air blockage based on the third air-blocking shielding assembly, thereby realizing a sealed shielding of one side of the rolling bearing 1. Among them, the difference between the third air-blocking shielding assembly and the second air-blocking shielding assembly is that there is no sleeve 64 in the third air-blocking shielding assembly, but it is directly sealed and fixedly connected to the mounting seat through the fourth air-blocking cover sleeved outside the shaft.

[0093] In any of the above embodiments, preferably, the gas blocking device is a packingless sealing device, and the packingless sealing device can form a gas blockage through the internal space, and it also includes a sealing ring and other structures, so it can also prevent water vapor, impurities, etc. from contacting the magnetic fluid sealing device 42. Of course, the gas blocking device can also be any other structure that can be connected to the interior of the magnetic fluid sealing device 42 in an airtight manner, and is not limited to the structure of the packingless sealing device and the gas blocking cover plus the separation device mentioned in this application.

[0094] like Figure 4As shown, an embodiment of the present application provides a multi-stage pump, comprising the air blocking shielding device provided by any embodiment of the first aspect. Specifically, the multi-stage pump comprises a shaft 2, a rolling bearing 1, and a first air blocking shielding assembly 4 that is sealably mounted on one side of the rolling bearing 1 and seals one side of the rolling bearing 1. The multi-stage pump also comprises an end cover 5b that is mounted on the other side of the rolling bearing 1 and seals the other side of the rolling bearing 1. The shaft 2 of the multi-stage pump passes through the first air blocking shielding assembly 4 and the rolling bearing 1 from top to bottom and is fixed on the inner side of the end cover 5b, or the shaft 2 of the multi-stage pump passes through the rolling bearing 1 and the first air blocking shielding assembly 4 from the inner side of the end cover 5b from top to bottom. For the rolling bearings 1 at different positions of the shaft 2, air blocking shielding assemblies of different structures can be used, wherein in Figure 4 In the embodiment, for the rolling bearing at the upper end of the shaft 2, a structure of a magnetic fluid sealing device 42, a first separation device 46 and a first air blocking cover 44 is adopted, while for the rolling bearing at the lower end of the shaft 2, the first air blocking shielding assembly 4 adopts a structure including a second separation device 47, a magnetic fluid sealing device 42 and a second air blocking cover 48.

[0095] like Figures 5 to 10 As shown, a vertical pump 7 provided according to an embodiment of the second aspect of the present invention comprises:

[0096] Connecting pipe assembly 71;

[0097] A pump working section 72, one end of which is sealed and mounted to the connecting pipe assembly 71, a support portion 720 is provided in the pump working section 72, and a through hole 7202 is provided on the support portion 720 for the pump shaft 70 to pass through;

[0098] The pump shaft 70 passes through the connecting pipe assembly 71 and is inserted into the pump working section 72 through the through hole 7202;

[0099] A protective tube 73, the protective tube 73 is located in the connecting tube assembly 71 and is installed outside the pump shaft 70, and the bottom of the protective tube 73 is sealed and installed to the support portion 720;

[0100] The first air blocking shielding assembly 74 is located in the pump working section 72 and is sleeved and installed on the pump shaft 70. The first air blocking shielding assembly 74 includes a first magnetic fluid sealing device 742 and an air blocking device. One end of the first magnetic fluid sealing device 742 is directly and sealably connected to the protective tube 73 or is indirectly and sealably connected to the protective tube 73 through the support portion 720. The air blocking device is sealably installed at one end of the first magnetic fluid sealing device 742 away from the protective tube 73 to prevent the first magnetic fluid sealing device 742 from contacting the liquid.

[0101] The first rolling bearing 75 is installed on a side of the first magnetic fluid sealing device 742 away from the air blocking device, and is used to support the pump shaft 70.

[0102] The vertical pump 7 provided according to the embodiment of the present invention comprises: a connecting pipe assembly 71 and a pump working section 72 which are sealed and connected to each other, and the pump shaft 70 passes through the connecting pipe assembly 71 from top to bottom, and passes through the pump working section 72 from the through hole 7202 on the support part 720, and the protective tube 73 is arranged in the connecting pipe assembly 71 and is sealed and installed on the upper side of the support part 720, so that the sealing shielding of the upper side of the first rolling bearing 75 can be achieved through the sealed connection between the protective tube 73 and the support part 720. A first air blocking shielding assembly 74 which is sealed and connected to the protective tube 73 is installed on the lower side of the first rolling bearing 75, and the first air blocking shielding assembly 74 realizes the sealing shielding of the lower side of the rolling bearing through the first magnetic fluid sealing device 742 and the air blocking device, wherein the first magnetic fluid sealing device 742 is used to achieve zero leakage sealing shielding, and the air blocking device can ensure that the first magnetic fluid sealing device 742 does not contact with the liquid through air blocking. Based on the first air blocking shielding assembly 74 introduced in the first aspect, it can be known that this structure effectively combines the magnetic fluid sealing device with the air blocking device, so that the magnetic fluid sealing device can be used for sealing and shielding of internal parts in the fluid cavity, thereby achieving a sealing and shielding effect of zero leakage of internal parts in the fluid cavity. At the same time, this structure replaces the original water guide bearing with a rolling bearing, and since the rolling bearing also has the advantages of long life and low price, therefore, by replacing the water guide bearing of the long shaft pump with a rolling bearing, the life of products such as the long shaft pump is also improved, and the cost and failure rate of products such as the long shaft pump are reduced.

[0103] In the above embodiment, preferably, one or more rolling bearings for supporting the pump shaft 70 are installed inside the protective tube 73 and above the first rolling bearing 75 .

[0104] In the above embodiment, preferably, Figures 5 to 10 As shown, a waterproof shell 7422 is provided outside the first magnetic fluid sealing device 742 , and the first magnetic fluid sealing device 742 is sealed and fixed to the protective tube 73 through the waterproof shell 7422 , and is sealed and fixedly connected to the air blocking device through the waterproof shell 7422 .

[0105] In this embodiment, since the first magnetic fluid sealing device 742 can be used for sealing and shielding the rolling bearing in the fluid channel, a waterproof shell 7422 is provided outside the first magnetic fluid sealing device 742 to enhance the waterproof performance of the outer side of the first magnetic fluid sealing device 742. Of course, the provision of the waterproof shell 7422 also facilitates the sealed connection and fixation between the magnetic fluid sealing device and the support portion 720 or the protective tube 73 and the air blocking device. Specifically, the first magnetic fluid sealing device 742 can be sealed and installed to the support portion 720, and is airtightly connected to the protective tube 73 through the support portion 720. Of course, the first magnetic fluid sealing device can also extend above the support portion 720 and be directly airtightly connected to the protective tube 73.

[0106] In any of the above embodiments, preferably, Figures 5 to 9 As shown, the air blocking device includes a first air blocking cover 744 , the upper end of which is sealed and mounted to the first magnetic fluid sealing device 742 , and the lower end of the air blocking device is located between the pump shaft 70 and the pump working section 72 .

[0107] In any of the above embodiments, preferably, Fig. 9 As shown, the upper end of the first air blocking cover 744 is a straight section, and / or the inner cavity area of ​​the lower end of the first air blocking cover 744 gradually increases from top to bottom, and the air blocking device also includes a first separation device 746, which is located between the inner wall of the upper end of the first air blocking cover 744 and the pump shaft 70 and fixed on the pump shaft 70, and the first separation device 746 is made of a honeycomb or grid-shaped material, and / or a reverse thread is provided on the outer side wall of the first separation device 746.

[0108] Among them, preferably, Fig. 9 As shown, the first separation device 746 is a ring structure. Of course, the first separation device 746 can also be as Figure 7 A semi-circular structure is shown.

[0109] More preferably, if Fig. 9 As shown, a water retaining structure 7442 is provided on the inner wall near the port at the lower end of the first air blocking cover 744, and a reverse thread is provided on one side of the water retaining structure 7442 near the axial surface. The water retaining structure 7442 can prevent the liquid outside the first air blocking cover 744 from directly rushing into the first air blocking cover 744 when the liquid pressure is high.

[0110] In any of the above embodiments, preferably, Figures 5 to 7 As shown, the vertical pump 7 is a long-axis submersible pump, and the pump working section 72 includes a guide vane body 724 sealed to the connecting pipe assembly 71 , a support portion 720 is provided in the guide vane body 724 , and a first air blocking shielding assembly 74 is installed in the guide vane body 724 .

[0111] In this embodiment, the water guide bearing provided at the connection between the guide vane body 724 and the connecting pipe assembly 71 of the long-axis submersible pump is replaced with a rolling bearing. At the same time, other bearings of the long-axis submersible pump can also be directly replaced with rolling bearings, thus solving the problems of high cost, short life and high failure rate of the existing long-axis submersible pump due to the use of water guide bearings. At the same time, since the guide vane body 724 has a long structure, the first air blocking shielding assembly 74 can be directly sealed and installed inside the through hole 7202 of the guide vane body 724.

[0112] Furthermore, if Figures 5 to 7As shown, when the vertical pump 7 is a long-axis submersible pump, the pump working section 72 also includes a first impeller section assembly 722 sealed to the lower end of the guide vane body 724, and the lower end of the first impeller section assembly 722 is sealed to a bell mouth.

[0113] In any of the above embodiments, preferably, Figures 8 to 10 As shown, the vertical pump 7 is a long-axis deep well pump, the connecting pipe assembly 71 is a water-lifting pipe assembly, the pump working section 72 includes a second impeller section assembly 726 and an intermediate assembly 728 connected to the water-lifting pipe assembly and the second impeller section assembly 726, a support portion 720 is provided in the intermediate assembly 728, and the first air blocking shielding assembly 74 is installed in the intermediate assembly 728.

[0114] In this embodiment, the water-conducting bearing provided at the connection between the water-lifting pipe assembly and the intermediate assembly 728 of the long-axis deep-well pump is replaced with the first rolling bearing 75. Meanwhile, other bearings of the long-axis deep-well pump can also be directly replaced with rolling bearings, thus solving the problems of high cost, short life and high failure rate of the existing long-axis deep-well pump due to the use of water-conducting bearings. Meanwhile, for the long-axis deep-well pump, the intermediate assembly 728 is generally tubular, so the support portion 720 inside it is relatively short. At this time, the first air blocking shielding assembly 74 can be directly installed on the lower end surface of the support portion 720 in a sealed manner.

[0115] More preferably, if Figures 8 to 10 As shown, the vertical pump 7 is a long-axis deep-well pump, and the long-axis deep-well pump also includes:

[0116] The water inlet section assembly 76 is sealed and connected to the lower end of the second impeller section assembly 726. A bearing seat 760 is provided in the water inlet section assembly 76. A through hole 7602 is provided on the bearing seat 760. The water inlet section assembly 76 is composed of a connecting section 764 directly connected to the second impeller section assembly 726 and a filter screen 762 connected to the connecting section 764.

[0117] The second rolling bearing 77 is installed in the through hole 7602. The pump shaft 70 extends from the second impeller section assembly 726 into the water inlet section assembly 76 and passes through the second rolling bearing 77 in the through hole 7602.

[0118] The second air blocking shielding assembly 78 comprises a second magnetic fluid sealing device 782 and a reverse outer cover 784, wherein the second magnetic fluid sealing device 782 is located above the bearing seat 760, is sealed and installed to the bearing seat 760, and is sleeved and installed outside the pump shaft 70, the lower end cover of the reverse outer cover 784 is arranged outside one end of the second magnetic fluid sealing device 782 away from the bearing seat 760, and the upper end of the reverse outer cover 784 is sealed and installed on the pump shaft 70, wherein a ventilation gap is arranged between the port at the lower end of the reverse outer cover 784 and the second magnetic fluid sealing device 782, and the distance between the inner side wall of the reverse outer cover 784 and the second magnetic fluid sealing device 782 gradually increases from top to bottom, and a second separation device 786 fixedly installed on the pump shaft 70 is arranged between the reverse outer cover 784 and the pump shaft 70;

[0119] The third air-blocking shielding assembly 79 includes a mounting seat 792, a sleeve 794 and a second air-blocking cover 796 which is open at both ends and hollow inside. The mounting seat 792 is sleeved and installed outside the pump shaft 70, is located below the bearing seat 760 and is sealed and installed to the bearing seat 760, and the upper end of the sleeve 794 is sleeved and installed outside the pump shaft 70, and is sealed and fixedly connected to the mounting seat 792, and the lower end of the sleeve 794 extends out of the lower end of the pump shaft 70 by a preset length, and the second air-blocking cover 796 is installed in the sleeve 794, is located below the lower end of the pump shaft 70, and both ends of the second air-blocking cover 796 are sealed and fixed to the inner wall of the sleeve 794, and the lower end of the pump shaft 70 is installed with a third separation device 798, and the third separation device 798 extends into the upper end of the second air-blocking cover 796.

[0120] In this embodiment, the water-conducting bearing of the long-axis deep-well pump near the filter screen 762 is replaced by the second rolling bearing 77, and at the same time, the upper and lower sides of the rolling bearing are sealed by the second air-blocking shielding assembly 78 and the third air-blocking shielding assembly 79. This solves the problem that the existing long-axis deep-well pump has high cost, short life and high failure rate due to the use of water-conducting bearings. Among them, the second air-blocking shielding assembly 78 mainly includes a second magnetic fluid sealing device 782, a reverse cover 784 and a second separation device 786, and the air block formed in the reverse cover 784 can prevent the upper end of the second magnetic fluid sealing device 782 from contacting with the liquid, and the lower end of the second magnetic fluid sealing device 782 is directly sealed and shielded with the bearing seat 760. The second separation device 786 can further separate the water vapor, impurities, etc. entering the reverse cover 784, so as to avoid the second magnetic fluid sealing device 782 from contacting with water vapor and impurities and failing. The third air blocking shielding assembly 79 realizes the sealing shielding of the lower side of the second rolling bearing 77 through the air blocking structure formed by the mounting seat 792, the sleeve 794 and the second air blocking cover 796 with openings at both ends and hollow inside. The third separation device 798 can further prevent the water vapor medium and the like from contacting the second rolling bearing 77. The principles of the second air blocking shielding assembly 78 and the third air blocking shielding assembly 79 can refer to the air blocking shielding assembly introduced in the first aspect, and will not be repeated here.

[0121] in, Fig.10 The structure and Figure 3 The structure of the first gas blocking shielding assembly 4 composed of the magnetic fluid sealing device 42, the second separation device 47 and the second gas blocking cover 48 is the same as that of the first gas blocking shielding assembly 4. Fig.10 The structure and Figure 3 The structure of the second air blocking shielding assembly 6 is the same as that of the second air blocking shielding assembly 6, therefore, Fig.10 The detailed structure of the second gas blocking shielding assembly 78 and the third gas blocking shielding assembly 79 can be referred to Figure 3 .

[0122] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0123] In the description of this specification, the description of the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0124] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0125] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gas blocking shielding device, characterized in that: The air blocking shielding device is used to seal and shield the rolling bearing, and the rolling bearing is used to support the vertically arranged shaft, wherein the air blocking shielding device includes: A support portion, wherein a through hole is provided on the support portion, and a rolling bearing is installed in the through hole or installed above the support portion; A sealing protection member is located on one side of the rolling bearing and is sealingly connected to the supporting portion; A first air blocking shielding assembly includes a magnetic fluid sealing device and an air blocking device, wherein the magnetic fluid sealing device is located on the other side of the rolling bearing and is sealed and connected to the support portion or the sealing protection member, and the air blocking device is sealed and installed on the side of the magnetic fluid sealing device away from the rolling bearing to prevent the magnetic fluid sealing device from contacting with the liquid, wherein one end of the shaft passes through the rolling bearing and the magnetic fluid sealing device; A waterproof shell is arranged outside the magnetic fluid sealing device, one end of the waterproof shell is sealed and fixed to the support part or the sealing protection member, and the other end of the waterproof shell is sealed and fixedly connected to the air blocking device; The air blocking device comprises an air blocking cover, a first end of which is sealingly mounted on a side of the magnetic fluid sealing device away from the rolling bearing; The magnetic fluid sealing device and the shaft are in dynamic sealing cooperation, and the air blocking device and the shaft are in clearance cooperation; Among them, the sealing protection part is sealingly connected to the support part from above the rolling bearing, the upper end of the shaft passes through the rolling bearing and extends into the sealing protection part, the magnetic fluid sealing device is located below the rolling bearing and is sealingly installed on the support part or the sealing protection part, the air block cover is a first air block cover that is at least partially sleeved on the outside of the shaft, the upper end of the first air block cover is sealingly installed on the lower end surface of the magnetic fluid sealing device, and the lower end of the first air block cover extends downward in the axial direction.

2. The gas blocking shielding device according to claim 1, characterized in that: A separation device installed on the shaft is arranged in the air blocking cover, and the separation device is located at a side of the magnetic fluid sealing device away from the rolling bearing.

3. The gas blocking shielding device according to claim 2, characterized in that: The separation device is arranged in the upper end of the first air blocking cover and is fixed to the first separation device on the shaft.

4. The gas blocking shielding device according to claim 3, characterized in that: The inner cavity area of ​​the first air blocking cover increases gradually from top to bottom or increases in steps or increases first and then remains unchanged; and / or A water retaining structure is provided on the inner wall of the lower end of the first air blocking cover near the port, and a reverse thread is provided on the side of the water retaining structure near the shaft surface, or a water retaining device is provided on the lower side of the first air blocking cover, and the water retaining device is installed on the shaft; and / or The sealing protection member is a protective tube that is sleeved and installed outside the shaft and sealed with the support part from above the rolling bearing. The end of the protective tube away from the support part is sealed, or the sealing protection member is a seat body or end cover installed on one side of the rolling bearing and capable of sealing one side of the rolling bearing.

5. A gas blocking shielding device, characterized in that: The air blocking shielding device is used to seal and shield the rolling bearing, and the rolling bearing is used to support the vertically arranged shaft, wherein the air blocking shielding device includes: A support portion, wherein a through hole is provided on the support portion, and a rolling bearing is installed in the through hole or installed above the support portion; A sealing protection member is located on one side of the rolling bearing and is sealingly connected to the supporting portion; A first air blocking shielding assembly includes a magnetic fluid sealing device and an air blocking device, wherein the magnetic fluid sealing device is located on the other side of the rolling bearing and is sealed and connected to the support portion or the sealing protection member, and the air blocking device is sealed and installed on the side of the magnetic fluid sealing device away from the rolling bearing to prevent the magnetic fluid sealing device from contacting with the liquid, wherein one end of the shaft passes through the rolling bearing and the magnetic fluid sealing device; A waterproof shell is arranged outside the magnetic fluid sealing device, one end of the waterproof shell is sealed and fixed to the support part or the sealing protection member, and the other end of the waterproof shell is sealed and fixedly connected to the air blocking device; The air blocking device comprises an air blocking cover, a first end of which is sealingly mounted on a side of the magnetic fluid sealing device away from the rolling bearing; The magnetic fluid sealing device and the shaft are in dynamic sealing cooperation, and the air blocking device and the shaft are in clearance cooperation; Among them, the air block cover is a second air block cover, the magnetic fluid sealing device is located on the upper side of the rolling bearing and is sealed and installed on the support part, the lower end cover of the second air block cover is arranged outside the end of the magnetic fluid sealing device away from the rolling bearing, and the upper end of the second air block cover is sealed and installed on the shaft, wherein a ventilation gap is arranged between the port at the lower end of the second air block cover and the magnetic fluid sealing device, and the distance between the inner side wall of the second air block cover and the magnetic fluid sealing device gradually increases from top to bottom or increases in steps or first increases and then remains unchanged.

6. The gas blocking shielding device according to claim 5, characterized in that: A separation device installed on the shaft is arranged in the air blocking cover, and the separation device is located at a side of the magnetic fluid sealing device away from the rolling bearing.

7. The gas blocking shielding device according to claim 6, characterized in that: The separation device is a second separation device arranged in the upper end of the second air blocking cover and fixed on the shaft; and / or The sealing protection member is an end cover located at the lower side of the rolling bearing and sealed to the support part, or the sealing protection member is a second air-blocking shielding assembly, which includes a mounting seat, a sleeve and a third air-blocking cover with openings at both ends and a hollow interior. The mounting seat is sleeved and installed outside the shaft, located below the rolling bearing, and is sealed and connected to the support part. The upper end of the sleeve is sleeved outside the shaft and is sealed and fixedly connected to the mounting seat. The lower end of the sleeve extends downward in the axial direction. The third air-blocking cover is installed in the sleeve, and the upper and lower ends of the third air-blocking cover are both sealed and connected to the sleeve. The inner cavity area of ​​the third air-blocking cover increases from top to bottom. A third separation device is provided in the upper end of the third air-blocking cover, and the third separation device is fixedly installed on the shaft. Among them, the lower end of the sleeve extends out of the lower end of the shaft by a preset length, the third air block cover is installed in the sleeve and is located below the lower end of the shaft, the third separation device is installed at the lower end of the shaft and extends into the third air block cover, or the other end of the sleeve is completely installed outside the shaft.

8. The gas blocking shielding device according to claim 1 or 5, characterized in that: The support portion is a long strip structure arranged in the vertical direction, and the sealing protection member or the first air blocking shielding assembly is sealed and installed in the through hole of the support portion; and / or The sealing protection part is a third air plug shielding assembly, which includes a mounting seat and a fourth air plug cover which is open at both ends and hollow inside. The mounting seat is sleeved outside the shaft, located below the rolling bearing, and is sealed and connected to the support part. The upper end of the fourth air plug cover is sleeved outside the shaft and is sealed and fixedly connected to the mounting seat. The lower end of the fourth air plug cover is sleeved outside the shaft and extends downward in the axial direction. The inner cavity area of ​​the fourth air plug cover increases from top to bottom. A fourth separation device is arranged inside the upper end of the fourth air plug cover, and the fourth separation device is fixedly mounted on the shaft.

9. A vertical pump, characterized in that: include: Connecting pipe assembly; A pump working section, one end of which is sealed and mounted to the connecting pipe assembly, a support portion is provided in the pump working section, and a through hole is provided on the support portion for the pump shaft to pass through; A pump shaft, the pump shaft passes through the connecting pipe assembly and is inserted into the pump working section through the through hole; A protective pipe, the protective pipe is located in the connecting pipe assembly and is installed outside the pump shaft, and the bottom of the protective pipe is sealed and installed to the support part; A first air blocking and shielding assembly is located in the working section of the pump and is sleeved and installed on the pump shaft. The first air blocking and shielding assembly includes a first magnetic fluid sealing device and an air blocking device. One end of the first magnetic fluid sealing device is sealingly connected to the protective tube. The air blocking device is sealingly installed at one end of the first magnetic fluid sealing device away from the protective tube to prevent the first magnetic fluid sealing device from contacting the liquid. The first rolling bearing is installed on the side of the first magnetic fluid sealing device away from the air blocking device and is used to support the pump shaft; the first magnetic fluid sealing device and the pump shaft are in dynamic sealing cooperation, and the air blocking device and the pump shaft are in clearance cooperation.

10. The vertical pump according to claim 9, characterized in that: One or more rolling bearings for supporting the pump shaft are installed inside the protective tube and above the first rolling bearing; and / or A waterproof shell is disposed outside the first magnetic fluid sealing device, the first magnetic fluid sealing device is sealed and fixed to the protective tube through the waterproof shell, and is sealed and fixedly connected to the air blocking device through the waterproof shell; and / or The air blocking device comprises a first air blocking cover, the upper end of which is sealingly mounted to the first magnetic fluid sealing device, and the lower end of the air blocking device is located between the pump shaft and the pump working section.

11. The vertical pump according to claim 10, characterized in that: The upper end of the first air blocking cover is a straight section, and / or the inner cavity area of ​​the lower end of the first air blocking cover gradually increases from top to bottom, the air blocking device also includes a first separation device, the first separation device is located between the inner wall of the upper end of the first air blocking cover and the pump shaft, and is fixedly installed on the pump shaft, the first separation device is made of a honeycomb or grid-shaped material, and / or the outer side wall of the first separation device is provided with a reverse thread; and / or A water retaining structure is arranged on the inner wall of the lower end of the first air blocking cover close to the port, and a reverse thread is arranged on one side of the water retaining structure close to the pump shaft.

12. The vertical pump according to any one of claims 9 to 11, characterized in that The vertical pump is a long-axis submersible pump, the pump working section includes a guide vane body sealed with the connecting pipe assembly, a support portion is provided in the guide vane body, and the first air blocking shielding assembly is installed in the guide vane body; or The vertical pump is a long-axis deep well pump, the connecting pipe assembly is a water lifting pipe assembly, the pump working section includes an impeller section assembly and an intermediate assembly connected to the water lifting pipe assembly and the impeller section assembly, a support portion is provided in the intermediate assembly, and the first air blocking shielding assembly is installed in the intermediate assembly.

13. The vertical pump according to claim 12, characterized in that: The vertical pump is a long-shaft deep well pump, which also includes: The water inlet section assembly is sealed and connected to the lower end of the impeller section assembly. A bearing seat is arranged in the water inlet section assembly, and a through hole is arranged on the bearing seat. A second rolling bearing is installed in the through hole, and the pump shaft extends from the impeller section assembly into the water inlet section assembly and passes through the second rolling bearing in the through hole; A second air blocking shielding assembly comprises a second magnetic fluid sealing device and a reverse outer cover, wherein the second magnetic fluid sealing device is located above the bearing seat, is sealed and installed to the bearing seat, and is sleeved and installed outside the pump shaft, the lower end cover of the reverse outer cover is arranged outside an end of the second magnetic fluid sealing device away from the bearing seat, and the upper end of the reverse outer cover is sealed and installed on the pump shaft, wherein a ventilation gap is arranged between the port at the lower end of the reverse outer cover and the second magnetic fluid sealing device, and the distance between the inner side wall of the reverse outer cover and the second magnetic fluid sealing device gradually increases from top to bottom, and a second separation device fixedly installed on the pump shaft is arranged between the reverse outer cover and the pump shaft; The third air-blocking shielding assembly includes a mounting seat, a sleeve and a second air-blocking cover which is open at both ends and hollow inside. The mounting seat is sleeved and installed outside the pump shaft, located below the bearing seat and sealed to the bearing seat, and the upper end of the sleeve is sleeved and installed outside the pump shaft and is sealed and fixedly connected to the mounting seat. The lower end of the sleeve extends out of the lower end of the pump shaft by a preset length. The second air-blocking cover is installed in the sleeve, located below the lower end of the pump shaft, and both ends of the second air-blocking cover are sealed and fixed to the inner wall of the sleeve. A third separation device is installed at the lower end of the pump shaft, and the third separation device extends into the upper end of the second air-blocking cover.

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