CN218509732U

CN218509732U - Vertical immersed liquid metal magnetic pump

Info

Publication number: CN218509732U
Application number: CN202220926645.8U
Authority: CN
Inventors: 方静辉; 苏文才; 董文心
Original assignee: Zhefu Holding Group Co ltd
Current assignee: Zhefu Holding Group Co ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2023-02-21
Anticipated expiration: 2032-04-20

Abstract

The utility model discloses a vertical submergence formula liquid metal magnetic drive pump, including the motor that from the top down set gradually, the pump cover, go up the pump body, lower pump body and water conservancy diversion ring, the lower extreme connection of motor is equipped with the pump shaft, the lower extreme of pump shaft stretches into in the water conservancy diversion ring, be equipped with the impeller with the pump shaft coupling in the water conservancy diversion ring, be equipped with cooling circuit in the pump cover, go up the upper bearing subassembly that is equipped with corresponding pump shaft between the pump body and the lower pump body, be equipped with the lower bearing assembly that corresponds the pump shaft in the water conservancy diversion ring, upper bearing subassembly includes the combination bearing structure who is formed an organic whole by guide bearing structure and thrust bearing structure, go up the pump body and be equipped with the installation cavity that corresponds combination bearing structure down between the pump body, be equipped with the feed tank that corresponds thrust bearing structure in the installation cavity. The utility model discloses a benefit is the demand of eliminating configuration auxiliary lubrication system, reduces system damage and cost, and what can be better is applicable to that the radial dimension is little, the compact small-size system installation occasion of structural requirement.

Description

Vertical immersed liquid metal magnetic pump

Technical Field

The application relates to the technical field of vertical magnetic pumps, in particular to a vertical immersed liquid metal magnetic pump.

Background

At present, a magnetic pump is commonly used for conveying liquid metal within the temperature range of 280-550 ℃, and the traditional structure components generally comprise a motor, a coupler, a dynamic seal, a maintenance static seal, a rotating component, a hydraulic component, a supporting component and the like. The rotor support is designed into a structure supported by an upper guide bearing and a lower guide bearing, the lower bearing is usually wholly immersed in high-temperature liquid metal, and a static pressure or dynamic pressure sliding bearing lubricated by the liquid metal is commonly used. For example, chinese patent document CN2020100118742 discloses a magnetic pump bearing housing structure in 2020, 4/21, which includes: the bearing box body, first antifriction bearing, outer magnetism rotor, second antifriction bearing, drive shaft and drive shaft baffle, first antifriction bearing and second antifriction bearing fixed mounting are at the bearing box body both ends, first antifriction bearing and second antifriction bearing cover are established on the drive shaft, be provided with first horizontal oil gallery on the bearing box body of first antifriction bearing top, be provided with second horizontal oil gallery on the bearing box body of below, be provided with third horizontal oil gallery on the bearing box body of second antifriction bearing top, be provided with fourth horizontal oil gallery on the bearing box body of below, outer magnetism rotor cover is established in drive shaft one end, the inner ring cover of first antifriction bearing is established on the tip of outer magnetism rotor, drive shaft baffle passes through fastening screw with outer magnetism rotor fixed mounting in the drive shaft. The defects in the prior art are that the upper bearing is generally arranged above the liquid level and cannot be lubricated by liquid metal. If the magnetic pump type is adopted, the lubricating medium must be additionally added to the upper bearing, and the risk of the lubricating medium leaking into the reactor core exists.

Disclosure of Invention

Based on above-mentioned not enough among the prior art, the utility model provides a vertical submergence formula liquid metal magnetic drive pump, upper portion bearing are located the liquid level below, eliminate the demand of configuration auxiliary lubrication system, and the reduction system damages and cost, and what can be better is applicable to the radial dimension and is little, the compact small-size system installation occasion of structural requirement.

The utility model discloses a another purpose adopts magnetic coupling to connect motor and pump shaft, has changed the movive seal of complicacy into reliable static seal, has reduced the risk that liquid metal leaked, and the reliability promotes by a wide margin.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme.

The utility model provides a vertical submergence formula liquid metal magnetic drive pump, which is characterized by, including the motor that sets gradually from the top down, the pump cover, go up the pump body, lower pump body and water conservancy diversion ring, the lower extreme connection of motor is equipped with the pump shaft, the lower extreme of pump shaft stretches into in the water conservancy diversion ring, be equipped with the impeller of being connected with the pump shaft in the water conservancy diversion ring, be equipped with cooling circuit in the pump cover, go up and be equipped with the upper bearing subassembly that corresponds the pump shaft between the pump body and the lower pump body, be equipped with the lower bearing subassembly that corresponds the pump shaft in the water conservancy diversion ring, upper bearing subassembly includes the integrated combination bearing structure that forms by guide bearing structure and thrust bearing structure, be equipped with the installation cavity that corresponds combination bearing structure between the upper pump body and the lower pump body, be equipped with the confession cistern that corresponds thrust bearing structure in the installation cavity.

Compared with a traditional vertical pump with an upper bearing adopting a rolling bearing, the pump shaft of the pump adopts a supporting structure corresponding to an upper bearing assembly and a lower bearing assembly, the traditional rolling bearing is cancelled above the liquid level, the two bearings are both below the working liquid level and are completely immersed in liquid metal, and the upper bearing adopts a combined structure bearing combining a thrust bearing and a radial bearing. A dynamic pressure lubrication effect is generated among the bearings to support the shafting, the shafting can run at high and low temperatures, a lubrication medium does not need to be supplemented, and the safety requirement of the reactor is completely met; meanwhile, the requirement for configuring an auxiliary lubricating system is eliminated, the system loss and the maintenance and replacement cost of the auxiliary system are reduced, and the service life and the reliability of the system are improved; the device has stronger size applicability, and can be better suitable for small-sized system installation occasions with small radial size and compact structure requirements.

Preferably, the mounting cavity is a stepped cylindrical hole with an inverted T-shaped axial cross section, and two sides of the thrust bearing structure respectively correspond to the bottom side of the upper pump body and the upper side of the lower pump body. The stepped wall surface of the mounting cavity corresponds to the peripheral side wall of the guide bearing structure and the upper end surface and the lower end surface of the thrust bearing structure respectively, reliable axial support and radial support are achieved, and transmission is reliable.

Preferably, the motor is connected with the pump shaft through a magnetic coupling; the magnetic coupling comprises an outer magnet and an inner magnet positioned in an inner cavity of the outer magnet, a shielding cover is arranged between the outer magnet and the inner magnet, the outer magnet is fixedly connected with a motor shaft of the motor, the inner magnet is fixedly connected with the upper end of the pump shaft, and the shielding cover is fixedly arranged on the bottom surface of the pump cover. The motor is connected with the pump shaft through the magnetic coupling, the complex dynamic seal is changed into the reliable static seal, the risk of liquid metal leakage is reduced, and the reliability is greatly improved.

Preferably, the cooling circuit comprises a first cooling circuit corresponding to the inner part of the lower end of the wall surface of the pump cover and a second cooling circuit corresponding to the magnetic coupling, and a plurality of air guide grooves corresponding to the second cooling circuit are arranged on an outer magnet of the magnetic coupling. The pump cover and the magnetic coupling are reliably cooled, the cooling medium of the second cooling loop can enter the outer magnet due to the arrangement of the air guide grooves, forced air cooling is realized on the shielding cover, and the cooling efficiency is ensured.

Preferably, the combined bearing structure adopts a hard alloy bushing, and the surface of the hard alloy bushing is provided with a surfacing layer. The combined bearing structure can be manufactured in a mode of surfacing or spraying hard alloy, and can also be molded in a mode of integrally casting the hard alloy.

Preferably, a shaft shoulder and a locking part corresponding to the combined bearing structure are arranged on the pump shaft, and the upper end and the lower end of the combined bearing structure are respectively abutted against the locking part and the shaft shoulder of the pump shaft. The axial locking of the combined bearing structure is realized.

Preferably, the retaining member includes a retaining nut secured to the pump shaft and a stop washer is disposed between the retaining nut and the guide bearing structure. As preferred, the pump cover adopts the formula structure of sinking, and the pump cover upper end is equipped with flange, and flange downside supports and is equipped with mounting platform, and the pump cover lower extreme stretches into mounting platform's below. The pump cover adopts a sunken structure, so that the length of the upper shaft extension section is reduced, and the stability of a shaft system is improved.

The utility model discloses following beneficial effect has: the requirement of configuring an auxiliary lubricating system is eliminated, and the damage and the cost of the system are reduced; the device can be better suitable for small-sized system installation occasions with small radial size and compact structural requirements; the magnetic coupling is adopted to connect the motor and the pump shaft, so that the complex dynamic seal is changed into the reliable static seal, the risk of liquid metal leakage is reduced, and the reliability is greatly improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged schematic view at a in fig. 1.

In the figure: a guide ring 5 of an upper pump body 3 and a lower pump body 4 of a pump cover 2 of a motor 1 is connected with a flange 6 mounting platform 7, a magnetic coupling 9 of the pump cover 8, an impeller 14 of a magnetic body 10, a shielding cover 13 of an impeller 14 of a first cooling circuit 15, a bearing assembly 17 on a guide bearing structure 18 of a first cooling circuit 16, a surfacing layer 20 on a thrust bearing structure 19 of the bearing assembly 17, a shaft shoulder 21, a stop washer 23, a mounting cavity 24, a liquid supply groove 25 and a lower bearing assembly 26.

Detailed Description

The invention is further illustrated with reference to the accompanying drawings and specific embodiments.

In the case of the example 1, the following examples are given,

as shown in fig. 1 to 2, a vertical immersed liquid metal magnetic pump comprises a motor 1, a pump cover 2, an upper pump body 3, a lower pump body 4 and a flow guide ring 5 which are sequentially arranged from top to bottom, wherein the pump cover 2 adopts a sunken structure, a connecting flange 6 is arranged at the upper end of the pump cover 2, the lower side of the connecting flange 6 is fixedly supported on a mounting platform 7 through screws, and the lower end of the pump cover 2 extends out of the lower part of the mounting platform 7 to form a sunken structure. The shell of the motor 1 is directly fixed on the flange surface at the upper end of the pump cover 2 through bolts. The lower end of the motor 1 is connected with a pump shaft 8, and the motor 1 is connected with the pump shaft 8 through a magnetic coupling 9; the magnetic coupling 9 comprises an outer magnet 10 and an inner magnet 12 positioned in the inner cavity of the outer magnet 10, a shielding cover 13 is arranged between the outer magnet 10 and the inner magnet 12, the outer magnet 10 is fixedly connected with a motor 1 shaft of the motor 1, the inner magnet 12 is fixedly connected with the upper end of the pump shaft 8, and the shielding cover 13 is fixedly arranged on the bottom surface of the pump cover 2. The lower end of the pump shaft 8 extends into the guide ring 5, an impeller 14 connected with the pump shaft 8 is arranged in the guide ring 5, a cooling loop is arranged in the pump cover 2 and comprises a first cooling loop 15 corresponding to the inner part of the lower end of the wall surface of the pump cover 2 and a second cooling loop 16 corresponding to the magnetic coupling 9, and a plurality of air guide grooves 11 corresponding to the second cooling loop 16 are formed in an outer magnet 10 of the magnetic coupling 9. An upper bearing assembly 17 corresponding to the pump shaft 8 is arranged between the upper pump body 3 and the lower pump body 4, a lower bearing assembly 26 corresponding to the pump shaft 8 is arranged in the guide ring 5, the upper bearing assembly 17 comprises a combined bearing structure formed by integrally forming a guide bearing structure 18 and a thrust bearing structure 19, the combined bearing structure adopts a hard alloy bushing, and a surfacing layer 20 is arranged on the surface of a friction pair corresponding to the hard alloy bushing. The pump shaft 8 is provided with a shaft shoulder 21 and a locking part corresponding to the combined bearing structure, and the upper end and the lower end of the combined bearing structure are respectively abutted against the locking part and the shaft shoulder 21 of the pump shaft 8. The locking element comprises a fixing nut 22 which is screwed onto the pump shaft 8, and a stop washer 23 is arranged between the fixing nut 22 and the guide bearing arrangement 18. An installation cavity 24 corresponding to the combined bearing structure is arranged between the pump body and the lower pump body 4, the installation cavity 24 is a stepped cylindrical hole with an axial cross section in an inverted T shape, and the upper end of the guide bearing structure 18 extends out of the installation cavity 24 and into the upper pump body 3. The two sides of the thrust bearing structure 19 correspond to the bottom side of the upper pump body 3 and the upper side of the lower pump body 4, respectively. A liquid supply tank 25 corresponding to the thrust bearing structure 19 is provided in the mounting cavity 24. The liquid supply tank 25 is provided corresponding to the side surface and the upper and lower end surfaces of the thrust bearing structure 19. In this embodiment, the lower bearing assembly 26 is a single piece, using a ring-shaped bushing of cemented carbide secured to the pump shaft 8. Through holes which are in clearance fit with the corresponding pump shafts 8 are respectively arranged in the upper pump body 3 and the lower pump body 4.

This application pump shaft 8 supports and adopts two upper and lower guide bearing support structure, has cancelled traditional antifriction bearing more than the liquid level, and two bearings are all below the working liquid level, and complete submergence is in liquid metal, and bearing friction is vice can adopt carbide build-up welding, spraying or is formed by carbide bulk casting. The upper bearing structure adopts a combined bearing structure combining a thrust bearing and a radial bearing. The dynamic pressure lubrication effect is generated between the bearings to support the shafting.

The motor 1 is partially sunk into the cavity of the pump cover 2 through a shaft of the motor 1 and is connected with a pump shaft 8 through a magnetic coupling 9, and the motor 1 is directly seated on the upper flange surface of the sunk pump cover 2; the shielding cover 13 of the magnetic coupling 9 is seated on the sunken flange surface of the pump cover 2, and the complete separation of the inner cavity and the outer cavity is ensured by using a static sealing structure; the structure of the pump cover 2 is provided with two cooling loops, one cooling loop cools parts such as the magnetic coupling 9 of the outer cavity, and the other cooling loop cools the structure below the pump cover 2 to strengthen the heat shielding effect; the lower structure of the pump cover 2 is connected in a multistage sectional mode and sequentially comprises an upper pump body 3 (comprising an upper bearing assembly 17), a lower pump body 4, a flow guide ring 5 (comprising a lower bearing assembly 26) and an impeller 14; in order to meet the heat shielding requirement of the system, structures such as a heat insulating plate and the like can be arranged in the upper pump body 3. In order to reduce the stability of the upper shafting vibration reinforcing shafting and reduce the cantilever distance of the main shaft above the liquid level, the pump cover 2 adopts a sinking type structure, and the magnetic coupling 9 sinking into the pump cover 2 and part of the motor 1 are matched to drive the operation of the main shaft and stabilize the shafting. The pump cover 2 adopts a deep hole processing type, two cooling loops are formed by punching the base body, high sealing performance below the pump cover 2 can be guaranteed, and the structure below the pump cover 2 and the side of the magnetic coupling 9 are respectively cooled.

Compared with the traditional vertical pump with the upper bearing adopting a rolling bearing and the sealing adopting mechanical seal, the sinking type liquid metal magnetic pump has the following advantages:

1) No auxiliary system, high reliability: the reactor can run at high and low temperatures without supplementing a lubricating medium, and the safety requirement of the reactor is completely met. Meanwhile, the requirement for configuring an auxiliary lubricating system is eliminated, the system loss and the maintenance and replacement cost of the auxiliary system are reduced, and the service life and the reliability of the system are improved;

2) No leakage risk, high risk controllability: the magnetic coupling 9 and the shielding cover 13 are selected, so that the complex dynamic seal is changed into the reliable static seal, the risk of liquid metal leakage is reduced, and the reliability is greatly improved;

3) Stronger size applicability: the device can be better suitable for small-sized system installation occasions with small radial size and compact structure requirements.

Claims

1. The utility model provides a vertical submergence formula liquid metal magnetic drive pump, which is characterized by, including the motor that sets gradually from the top down, the pump cover, go up the pump body, lower pump body and water conservancy diversion ring, the lower extreme connection of motor is equipped with the pump shaft, the lower extreme of pump shaft stretches into in the water conservancy diversion ring, be equipped with the impeller of being connected with the pump shaft in the water conservancy diversion ring, be equipped with cooling circuit in the pump cover, go up and be equipped with the upper bearing subassembly that corresponds the pump shaft between the pump body and the lower pump body, be equipped with the lower bearing subassembly that corresponds the pump shaft in the water conservancy diversion ring, upper bearing subassembly includes the integrated combination bearing structure that forms by guide bearing structure and thrust bearing structure, be equipped with the installation cavity that corresponds combination bearing structure between the upper pump body and the lower pump body, be equipped with the confession cistern that corresponds thrust bearing structure in the installation cavity.

2. The vertical submerged liquid metal magnetic pump as claimed in claim 1, wherein the installation cavity is in the shape of a stepped cylindrical hole with an inverted "T" shaped axial cross-section, and both sides of the thrust bearing structure correspond to the bottom side of the upper pump body and the upper side of the lower pump body, respectively.

3. The vertical submerged liquid metal magnetic pump of claim 1, wherein the motor is coupled to the pump shaft by a magnetic coupling; the magnetic coupling comprises an outer magnet and an inner magnet positioned in an inner cavity of the outer magnet, a shielding cover is arranged between the outer magnet and the inner magnet, the outer magnet is fixedly connected with a motor shaft of the motor, the inner magnet is fixedly connected with the upper end of the pump shaft, and the shielding cover is fixedly arranged on the bottom surface of the pump cover.

4. The vertical submerged liquid metal magnetic pump as claimed in claim 3, wherein the cooling circuit comprises a first cooling circuit corresponding to the interior of the lower end of the wall surface of the pump cover and a second cooling circuit corresponding to the magnetic coupling, and a plurality of air guide grooves corresponding to the second cooling circuit are formed in an outer magnet of the magnetic coupling.

5. The vertical submerged liquid metal magnetic pump as claimed in claim 1, wherein the combined bearing structure is a cemented carbide liner with a weld overlay on the surface.

6. The vertical submerged liquid metal magnetic pump as claimed in claim 5, wherein the pump shaft is provided with a shoulder and a locking member corresponding to the combined bearing structure, and the upper and lower ends of the combined bearing structure are respectively abutted against the locking member and the shoulder of the pump shaft.

7. A vertical submerged liquid metal magnetic pump as claimed in claim 6, wherein the retaining member includes a retaining nut secured to the shaft of the pump, and a retaining washer is provided between the retaining nut and the guide bearing structure.

8. A vertical submerged liquid metal magnetic pump as claimed in claim 1 or 4, characterized in that the pump cover is of a submerged structure, the upper end of the pump cover is provided with a connecting flange, the lower side of the connecting flange is supported by a mounting platform, and the lower end of the pump cover extends into the lower part of the mounting platform.