High-temperature-resistant and corrosion-resistant centrifugal pump

Abstract

The utility model discloses a kind of high-temperature-resistant corrosion-resistant centrifugal pumps, to solve the deficiency of the poor corrosion resistance and high-temperature resistance of existing centrifugal pump. The utility model includes pump body, pump cavity is arranged in pump body, corrosion-resistant impeller is installed in pump cavity, corrosion-resistant impeller is connected with main shaft, and corrosion-resistant layer is lined on the inner wall of pump cavity, and pump body is connected with bearing box, bearing cooling cavity is arranged on bearing box, and cooling liquid is circulated in bearing cooling cavity. The centrifugal pump of the present application has good high-temperature resistance and corrosion resistance, prolonging the service life.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and more specifically, it relates to a high-temperature and corrosion-resistant centrifugal pump. Background Technology

[0002] Centrifugal pumps are currently available in a wide variety of types and are widely used in the chemical industry, playing a vital role in industrial production. In the technology of producing dimethyl ether using a complex acid-liquid phase process, the reaction temperature reaches as high as 150℃, and the catalyst in the reactor is a mixture of sulfuric acid and phosphoric acid, which is highly corrosive. Commonly used centrifugal pump components are mostly made of stainless steel, Hastelloy, titanium, or zirconium. During use, the strong corrosion and high temperature cause severe corrosion of the centrifugal pump in a short period. Furthermore, the impeller inside the centrifugal pump is affected by high temperature and strong corrosion, leading to pump failure and inability to function properly. Frequent replacement of centrifugal pumps increases production costs for enterprises. Simultaneously, the high temperature of the medium is transferred to the bearings, drastically shortening their service life. Because continuous operation for extended periods is not possible, production efficiency is low, and maintenance is time-consuming and labor-intensive. For example, a centrifugal pump disclosed in Chinese Patent Application No. 2015102197644 has high hydraulic efficiency and head, but it does not consider high temperature resistance and corrosion resistance. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides a high-temperature and corrosion-resistant centrifugal pump with good high-temperature and corrosion resistance, thus extending its service life.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a high-temperature and corrosion-resistant centrifugal pump, including a pump body, a pump chamber provided in the pump body, a corrosion-resistant impeller installed in the pump chamber, the corrosion-resistant impeller connected to the main shaft, a corrosion-resistant layer lined on the inner wall of the pump chamber, a bearing housing connected to the pump body, a bearing cooling chamber provided on the bearing housing, and coolant flowing in the bearing cooling chamber.

[0005] When a centrifugal pump is working, the main shaft drives the corrosion-resistant impeller to rotate, allowing the medium to enter the pump chamber and be transported outward, thus achieving the pumping of the medium. The inner wall of the pump chamber is lined with a corrosion-resistant layer, and the impeller itself is also corrosion-resistant, exhibiting excellent corrosion resistance. A bearing cooling chamber is installed on the bearing housing, through which coolant circulates, thereby cooling the main shaft and bearings, and consequently lowering the temperature of the corrosion-resistant impeller. This improves the high-temperature resistance of the impeller and prevents the bearings from being subjected to excessively high temperatures, which could shorten their service life.

[0006] The centrifugal pump described in this patent application has good high temperature resistance and corrosion resistance, thus extending its service life.

[0007] Preferably, the rear end of the spindle extends out to the bearing housing, and a cooling fan is installed at the rear of the spindle, with the cooling fan blowing air toward the bearing housing.

[0008] As the cooling fan blades rotate with the main shaft, they generate airflow, which blows towards the bearing housing to dissipate heat.

[0009] Preferably, a coupling is connected to the rear end of the main shaft, and a stepped surface is provided at the rear of the main shaft, with the cooling fan blades limited between the stepped surface and the coupling.

[0010] The coupling facilitates the connection between the main shaft and the drive motor. The cooling fan blades are limited between the stepped surface and the coupling, achieving axial positioning and ensuring smooth operation.

[0011] Preferably, a number of cooling fins are arranged circumferentially at intervals on the outer wall of the bearing housing.

[0012] The cooling fins further improve the heat dissipation effect on the bearing housing.

[0013] Preferably, the bearing housing is provided with an inlet and an outlet, both of which are connected to the bearing cooling cavity.

[0014] The inlet and outlet nozzles facilitate the entry and exit of coolant, ensuring a continuous flow of coolant within the bearing cooling chamber and guaranteeing effective cooling.

[0015] Preferably, a front bearing and a rear bearing are installed in the bearing housing at intervals, and the inner rings of both the front bearing and the rear bearing are fastened to the spindle.

[0016] A front bearing and a rear bearing are installed between the spindle and the bearing housing to ensure the smoothness of the spindle rotation process.

[0017] Preferably, a shoulder is provided on the spindle, and a front mounting groove and a rear mounting groove are provided in the bearing housing. The outer rings of the front bearing and the rear bearing are respectively fitted into the front mounting groove and the rear mounting groove. The inner rings of the front bearing and the rear bearing are respectively abutted against the front and rear ends of the shoulder. A front cover and a rear cover are installed in the bearing housing, with the front cover pressing on the outer ring of the front bearing and the rear cover pressing on the outer ring of the rear bearing.

[0018] The shaft shoulder provides axial positioning for the inner rings of the front and rear bearings. The front and rear covers provide axial positioning for the outer rings of the front and rear bearings.

[0019] Preferably, a pump cover is tightly connected between the pump body and the bearing housing, and the pump cover is lined with a corrosion-resistant layer on the surface corresponding to the pump cavity.

[0020] The pump cover is installed between the pump body and the bearing housing, thus forming the pump chamber, which is easy to assemble.

[0021] Preferably, the corrosion-resistant impeller is provided with a rearwardly extending sleeve, which is fitted onto the outer wall of the main shaft.

[0022] The extension sleeve increases the axial connection distance between the corrosion-resistant impeller and the main shaft, improving connection reliability and preventing corrosion caused by media contacting the main shaft.

[0023] Preferably, a mechanical seal assembly is connected to the outer periphery of the spindle. The mechanical seal assembly includes a spring seat, a rotating ring, a stationary ring, and a preload spring. The spring seat is fastened to the spindle, the stationary ring is fixedly installed in the bearing housing, the rotating ring is axially movable and installed outside the spindle, and the preload spring abuts against the spring seat and the rotating ring. The end face of the rotating ring and the end face of the stationary ring are sealed and fitted together.

[0024] The mechanical seal assembly ensures the sealing performance after the spindle is installed, preventing leakage.

[0025] Compared with the prior art, the beneficial effects of this utility model are: (1) The centrifugal pump of this patent application has good high temperature resistance and corrosion resistance, which meets the corrosion resistance of acids, alkalis, salts and solvents in the chemical field, improves the operating temperature range of the medium, and extends the service life of the centrifugal pump; (2) Cooling liquid is circulated on the bearing box, cooling fan is installed on the main shaft, and cooling fins are set on the bearing box. Multiple cooling methods further improve the cooling effect, and can effectively control the bearing temperature rise and ensure the stable operation of the centrifugal pump without reducing the medium temperature. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the present invention.

[0027] Figure 2 This is a structural diagram of the bearing housing of this utility model.

[0028] Figure 3 This is a side view of the bearing housing of this utility model.

[0029] Figure 4 This is a partial cross-sectional view of Embodiment 2 of this utility model.

[0030] In the diagram: 1. Pump body, 2. Medium inlet, 3. Medium outlet, 4. Pump chamber, 5. Corrosion-resistant layer, 6. Dovetail groove, 7. Corrosion-resistant impeller, 8. Main shaft, 9. Extension sleeve, 10. Bearing housing, 11. Bearing cooling chamber, 12. Liquid inlet, 13. Liquid outlet, 14. Liquid outlet threaded hole, 15. Liquid inlet threaded hole, 16. Cooling fan blade, 17. Coupling, 18. Cooling fins, 19. Front bearing, 20. Rear bearing, 21. Shaft shoulder, 22. Front mounting groove, 23. Rear mounting groove, 24. Positioning convex ring, 25. Front cover, 26. Rear cover, 27. Sealing lip, 28. Positioning convex ring, 29. Pump cover, 30. Mounting ring, 31. Spring seat, 32. Moving ring, 33. Stationary ring, 34. Preload spring, 35. Fixed seat. 37. Transition ring, 38. Cooling channel, 39. Liquid inlet hole, 40. Liquid outlet hole, 41. Liquid inlet ring groove, 42. Liquid outlet ring groove, 43. Front liquid passage hole, 44. Rear liquid passage hole. Detailed Implementation

[0031] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0032] Example 1: A high-temperature and corrosion-resistant centrifugal pump (see...) Figure 1 , Figure 2 , Figure 3 The system includes a pump body 1, with a medium inlet 2 and a medium outlet 3. A pump chamber 4 is located inside the pump body 1. The medium outlet 3 is arranged tangentially to the pump chamber 4, and the medium inlet 2 is arranged axially along the pump chamber 4. The medium inlet 2 opens forward, and the medium outlet 3 opens upward. A corrosion-resistant layer 5, made of fluoroplastic, is lined the inner wall of the pump chamber 4. The corrosion-resistant layer 5 extends to the opening ends of the medium inlet 2 and the medium outlet 3. Dovetail grooves 6 are provided on the opening end faces of the medium inlet 2 and the medium outlet 3. The edges of the corrosion-resistant layer 5 fill the dovetail grooves 6 to achieve reliable positioning and prevent detachment.

[0033] A corrosion-resistant impeller 7, made of fluoroplastic material, is installed inside the pump chamber 4. The impeller 7 is connected to the main shaft 8. An extension sleeve 9 extends rearward from the impeller 7, forming an integral structure. The extension sleeve 9 is fitted onto the outer wall of the main shaft 8. A tapered hole is provided at the front end of the main shaft 8 to facilitate the installation and positioning of the impeller 7. The extension sleeve 9 increases the axial connection distance between the impeller 7 and the main shaft 8, improving connection reliability and preventing corrosion caused by media contact with the main shaft 8.

[0034] Pump body 1 is connected to bearing housing 10, and bearing housing 10 is provided with bearing cooling chamber 11, through which coolant flows. Bearing housing 10 is provided with inlet nozzle 12 and outlet nozzle 13, both of which communicate with bearing cooling chamber 11. Inlet nozzle 12 is located at the lower circumferential position, and outlet nozzle 13 is located at the upper circumferential position. Bearing housing 10 is provided with outlet threaded hole 14 and inlet threaded hole 15, both of which communicate with bearing cooling chamber 11. Inlet nozzle 12 is threadedly connected to inlet threaded hole 15, and outlet nozzle 13 is threadedly connected to outlet threaded hole 14. Inlet nozzle 12 and outlet nozzle 13 facilitate the entry and exit of coolant, ensuring continuous flow of coolant within bearing cooling chamber 11 and guaranteeing cooling effect.

[0035] A bearing housing 10 extends from the rear end of the main shaft 8. A cooling fan 16 is installed at the rear of the main shaft 8, blowing air towards the bearing housing 10. A coupling 17 is connected to the rear end of the main shaft 8. A stepped surface is provided at the rear of the main shaft 8, and the cooling fan 16 is confined between the stepped surface and the coupling 17. As the cooling fan 16 rotates with the main shaft 8, it generates airflow, which blows towards the bearing housing 10 to dissipate heat. The coupling 17 facilitates the connection between the main shaft 8 and the drive motor, and the confining of the cooling fan 16 between the stepped surface and the coupling 17 achieves axial positioning, ensuring smooth operation.

[0036] A number of cooling fins 18 are arranged circumferentially on the outer wall of the bearing housing 10. Three cooling fins 18 are arranged at three positions on the upper, left and right sides of the outer wall of the bearing housing 10. The cooling fins 18 protrude from the outer wall of the bearing housing 10 and are all integral with the bearing housing 10.

[0037] A front bearing 19 and a rear bearing 20, spaced apart, are installed inside the bearing housing 10. The inner rings of both the front bearing 19 and the rear bearing 20 are securely connected to the spindle 8. The installation of the front bearing 19 and the rear bearing 20 between the spindle 8 and the bearing housing 10 ensures the smoothness of the spindle 8's rotation. A shoulder 21 is provided on the spindle 8, protruding above the outer wall of the spindle 8. A front mounting groove 22 and a rear mounting groove 23 are provided inside the bearing housing 10. Both the front mounting groove 22 and the rear mounting groove 23 are through grooves. The outer rings of the front bearing 19 and the rear bearing 20 are respectively fitted into the front mounting groove 22 and the rear mounting groove 23. A positioning protrusion ring 24 is provided on the inner wall of the front mounting groove 22. The inner rings of the front bearing 19 and the rear bearing 20 abut against the front and rear ends of the shoulder 21, respectively, and the outer ring of the front bearing 19 is positioned against the positioning protrusion ring 24. A front cover 25 and a rear cover 26 are installed inside the bearing housing 10. The front cover 25 presses against the outer ring of the front bearing 19, and the rear cover 26 presses against the outer ring of the rear bearing 20. Sealing lips 27 are installed between the front cover 25 and the spindle 8, and between the rear cover 26 and the spindle 8. Positioning rings 28 are provided on both the front cover 25 and the rear cover 26. The positioning ring 28 on the front cover 25 presses against the outer ring of the front bearing 19, and the positioning ring 28 on the rear cover 26 presses against the outer ring of the rear bearing 20. A shoulder 21 provides axial positioning for the inner rings of the front bearing 19 and the rear bearing 20. The front cover 25 and the rear cover 26 provide axial positioning for the outer rings of the front bearing 19 and the rear bearing 20.

[0038] A pump cover 29 is tightly connected between the pump body 1 and the bearing housing 10. The pump cover 29 has a corrosion-resistant layer 5 on its surface corresponding to the pump cavity 4. The pump cover 29 is installed between the pump body 1 and the bearing housing 10 to form the pump cavity 4, which is easy to assemble. A raised mounting ring 30 is provided on the end face of the pump cover 29, and the mounting ring 30 is tightly fitted to the end opening of the bearing housing 10.

[0039] The main spindle 8 is externally connected to a mechanical seal assembly, which includes a spring seat 31, a rotating ring 32, a stationary ring 33, and a preload spring 34. The spring seat 31 is fastened to the main spindle 8, the stationary ring 33 is fixedly installed inside the bearing housing 10, the rotating ring 32 is axially movable and installed outside the main spindle 8, and the preload spring 34 abuts between the spring seat 31 and the rotating ring 32. The end face of the rotating ring 32 is sealed and fitted with the end face of the stationary ring 33.

[0040] A fixed seat 35 is installed inside the bearing housing 10. A stationary ring 33 is fastened to the end of the pump cover 29. A transition ring 37 is tightly connected between the stationary ring 33 and the fixed seat 35. The end face of the rotating ring 32 is tightly fitted to the end face of the stationary ring 33. The mechanical seal assembly ensures the sealing performance of the spindle 8 after installation and prevents leakage.

[0041] When the centrifugal pump is working, the main shaft 8 drives the corrosion-resistant impeller 7 to rotate, allowing the medium to enter the pump chamber 4 and be transported outward, thus realizing the pumping of the medium. The inner wall of the pump chamber 4 is lined with a corrosion-resistant layer 5, and the impeller is a corrosion-resistant impeller 7 with good corrosion resistance. A bearing cooling chamber 11 is provided on the bearing housing 10, and coolant flows in the bearing cooling chamber 11, thereby cooling the main shaft 8 and the bearing, and further cooling the corrosion-resistant impeller 7, improving the high-temperature resistance of the corrosion-resistant impeller 7, and preventing the bearing from being subjected to high temperatures that would affect its service life.

[0042] Example 2: A high-temperature and corrosion-resistant centrifugal pump (see...) Figure 2 , Figure 3 , Figure 4 The system includes a pump body 1, with a medium inlet 2 and a medium outlet 3. A pump chamber 4 is located inside the pump body 1. The medium outlet 3 is arranged tangentially to the pump chamber 4, and the medium inlet 2 is arranged axially along the pump chamber 4. The medium inlet 2 opens forward, and the medium outlet 3 opens upward. A corrosion-resistant layer 5, made of fluoroplastic, is lined the inner wall of the pump chamber 4. The corrosion-resistant layer 5 extends to the opening ends of the medium inlet 2 and the medium outlet 3. Dovetail grooves 6 are provided on the opening end faces of the medium inlet 2 and the medium outlet 3. The edges of the corrosion-resistant layer 5 fill the dovetail grooves 6 to achieve reliable positioning and prevent detachment.

[0043] A corrosion-resistant impeller 7, made of fluoroplastic material, is installed inside the pump chamber 4. The impeller 7 is connected to the main shaft 8. An extension sleeve 9 extends rearward from the impeller 7, forming an integral structure. The extension sleeve 9 is fitted onto the outer wall of the main shaft 8. A tapered hole is provided at the front end of the main shaft 8 to facilitate the installation and positioning of the impeller 7. The extension sleeve 9 increases the axial connection distance between the impeller 7 and the main shaft 8, improving connection reliability and preventing corrosion caused by media contact with the main shaft 8.

[0044] Pump body 1 is connected to bearing housing 10, and bearing housing 10 is provided with bearing cooling chamber 11, through which coolant flows. Bearing housing 10 is provided with inlet nozzle 12 and outlet nozzle 13, both of which communicate with bearing cooling chamber 11. Inlet nozzle 12 is located at the lower circumferential position, and outlet nozzle 13 is located at the upper circumferential position. Bearing housing 10 is provided with outlet threaded hole 14 and inlet threaded hole 15, both of which communicate with bearing cooling chamber 11. Inlet nozzle 12 is threadedly connected to inlet threaded hole 15, and outlet nozzle 13 is threadedly connected to outlet threaded hole 14. Inlet nozzle 12 and outlet nozzle 13 facilitate the entry and exit of coolant, ensuring continuous flow of coolant within bearing cooling chamber 11 and guaranteeing cooling effect.

[0045] A bearing housing 10 extends from the rear end of the main shaft 8. A cooling fan 16 is installed at the rear of the main shaft 8, blowing air towards the bearing housing 10. A coupling 17 is connected to the rear end of the main shaft 8. A stepped surface is provided at the rear of the main shaft 8, and the cooling fan 16 is confined between the stepped surface and the coupling 17. As the cooling fan 16 rotates with the main shaft 8, it generates airflow, which blows towards the bearing housing 10 to dissipate heat. The coupling 17 facilitates the connection between the main shaft 8 and the drive motor, and the confining of the cooling fan 16 between the stepped surface and the coupling 17 achieves axial positioning, ensuring smooth operation.

[0046] A number of cooling fins 18 are arranged circumferentially on the outer wall of the bearing housing 10. Three cooling fins 18 are arranged at three positions on the upper, left and right sides of the outer wall of the bearing housing 10. The cooling fins 18 protrude from the outer wall of the bearing housing 10 and are all integral with the bearing housing 10.

[0047] A front bearing 19 and a rear bearing 20, spaced apart, are installed inside the bearing housing 10. The inner rings of both the front bearing 19 and the rear bearing 20 are securely connected to the spindle 8. The installation of the front bearing 19 and the rear bearing 20 between the spindle 8 and the bearing housing 10 ensures the smoothness of the spindle 8's rotation. A shoulder 21 is provided on the spindle 8, protruding above the outer wall of the spindle 8. A front mounting groove 22 and a rear mounting groove 23 are provided inside the bearing housing 10. Both the front mounting groove 22 and the rear mounting groove 23 are through grooves. The outer rings of the front bearing 19 and the rear bearing 20 are respectively fitted into the front mounting groove 22 and the rear mounting groove 23. A positioning protrusion ring 24 is provided on the inner wall of the front mounting groove 22. The inner rings of the front bearing 19 and the rear bearing 20 abut against the front and rear ends of the shoulder 21, respectively, and the outer ring of the front bearing 19 is positioned against the positioning protrusion ring 24. A front cover 25 and a rear cover 26 are installed inside the bearing housing 10. The front cover 25 presses on the outer ring of the front bearing 19, and the rear cover 26 presses on the outer ring of the rear bearing 20.

[0048] A cooling channel 38 is provided inside the spindle 8, with an inlet hole 39 and an outlet hole 40 connected to both ends of the cooling channel 38. An inlet ring groove 41 connected to the inlet hole 39 and an outlet ring groove 42 connected to the outlet hole 40 are provided on the outer wall of the spindle 8. A front liquid passage hole 43 is provided on the front cover 25, and a rear liquid passage hole 44 is provided on the rear cover 26. The front liquid passage hole 43 is connected to the inlet ring groove 41, and the rear liquid passage hole 44 is connected to the outlet ring groove 42. Both the front cover 25 and the rear cover 26 are fitted together with the spindle 8. Two oil seals are installed between the inner wall of the front cover 25 and the outer wall of the spindle 8, and between the inner wall of the rear cover 26 and the spindle 8. The front liquid passage hole 43 is located between the two oil seals on the inner wall of the front cover 25, and the rear liquid passage hole 44 is located between the two oil seals on the inner wall of the rear cover 26. Coolant is introduced through the forward through-hole 43, flows through the inlet ring groove 41, inlet hole 39, cooling channel 38, outlet hole 40, and outlet ring groove 42, and is discharged outward through the rear through-hole 44. The coolant flows directly into the spindle 8 to cool it, thus improving the cooling effect.

[0049] Both the front cover 25 and the rear cover 26 are provided with locating rings 28. The locating ring 28 on the front cover 25 presses against the outer ring of the front bearing 19, and the locating ring 28 on the rear cover 26 presses against the outer ring of the rear bearing 20. The shoulder 21 provides axial positioning for the inner rings of the front bearing 19 and the rear bearing 20. The front cover 25 and the rear cover 26 provide axial positioning for the outer rings of the front bearing 19 and the rear bearing 20.

[0050] A pump cover 29 is tightly connected between the pump body 1 and the bearing housing 10. The pump cover 29 has a corrosion-resistant layer 5 on its surface corresponding to the pump cavity 4. The pump cover 29 is installed between the pump body 1 and the bearing housing 10 to form the pump cavity 4, which is easy to assemble. A raised mounting ring 30 is provided on the end face of the pump cover 29, and the mounting ring 30 is tightly fitted to the end opening of the bearing housing 10.

[0051] The main spindle 8 is externally connected to a mechanical seal assembly, which includes a spring seat 31, a rotating ring 32, a stationary ring 33, and a preload spring 34. The spring seat 31 is fastened to the main spindle 8, the stationary ring 33 is fixedly installed inside the bearing housing 10, the rotating ring 32 is axially movable and installed outside the main spindle 8, and the preload spring 34 abuts between the spring seat 31 and the rotating ring 32. The end face of the rotating ring 32 is sealed and fitted with the end face of the stationary ring 33.

[0052] A fixed seat 35 is installed inside the bearing housing 10. A stationary ring 33 is fastened to the end of the pump cover 29. A transition ring 37 is tightly connected between the stationary ring 33 and the fixed seat 35. The end face of the rotating ring 32 is tightly fitted to the end face of the stationary ring 33. The mechanical seal assembly ensures the sealing performance of the spindle 8 after installation and prevents leakage.

[0053] When the centrifugal pump is working, the main shaft 8 drives the corrosion-resistant impeller 7 to rotate, allowing the medium to enter the pump chamber 4 and be transported outward, thus realizing the pumping of the medium. The inner wall of the pump chamber 4 is lined with a corrosion-resistant layer 5, and the impeller is a corrosion-resistant impeller 7 with good corrosion resistance. A bearing cooling chamber 11 is provided on the bearing housing 10, and coolant flows in the bearing cooling chamber 11, thereby cooling the main shaft 8 and the bearing, and further cooling the corrosion-resistant impeller 7, improving the high-temperature resistance of the corrosion-resistant impeller 7, and preventing the bearing from being subjected to high temperatures that would affect its service life.

[0054] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A high-temperature and corrosion-resistant centrifugal pump, characterized in that, It includes a pump body, a pump chamber inside the pump body, a corrosion-resistant impeller installed inside the pump chamber, the corrosion-resistant impeller connected to the main shaft, a corrosion-resistant layer lining the inner wall of the pump chamber, a bearing housing connected to the pump body, a bearing cooling chamber provided on the bearing housing, and coolant flowing inside the bearing cooling chamber.

2. The high-temperature and corrosion-resistant centrifugal pump according to claim 1, characterized in that, The bearing housing extends from the rear end of the spindle, and cooling fan blades are installed at the rear of the spindle, blowing air towards the bearing housing.

3. A high-temperature and corrosion-resistant centrifugal pump according to claim 2, characterized in that, A coupling is connected to the rear end of the main shaft, and a stepped surface is provided at the rear of the main shaft. The cooling fan is limited between the stepped surface and the coupling.

4. The high-temperature and corrosion-resistant centrifugal pump according to claim 1, characterized in that, Several cooling fins are arranged circumferentially on the outer wall of the bearing housing.

5. A high-temperature and corrosion-resistant centrifugal pump according to claim 1, characterized in that, The bearing housing is equipped with an inlet and an outlet nozzle, both of which are connected to the bearing cooling chamber.

6. A high-temperature and corrosion-resistant centrifugal pump according to claim 1, characterized in that, The bearing housing contains front and rear bearings spaced apart, with the inner rings of both bearings securely connected to the spindle.

7. A high-temperature and corrosion-resistant centrifugal pump according to claim 6, characterized in that, A shoulder is provided on the spindle, and a front mounting groove and a rear mounting groove are provided in the bearing housing. The outer rings of the front bearing and the rear bearing are respectively fitted into the front mounting groove and the rear mounting groove. The inner rings of the front bearing and the rear bearing are respectively abutted against the front and rear ends of the shoulder. A front cover and a rear cover are installed in the bearing housing. The front cover presses on the outer ring of the front bearing, and the rear cover presses on the outer ring of the rear bearing.

8. A high-temperature and corrosion-resistant centrifugal pump according to claim 1, characterized in that, The pump cover is tightly connected between the pump body and the bearing housing, and the pump cover is lined with a corrosion-resistant layer on the surface corresponding to the pump cavity.

9. A high-temperature and corrosion-resistant centrifugal pump according to any one of claims 1 to 8, characterized in that, An extension sleeve extending backward is provided on the corrosion-resistant impeller, and the extension sleeve is fitted onto the outer wall of the main shaft.

10. A high-temperature and corrosion-resistant centrifugal pump according to any one of claims 1 to 8, characterized in that, The spindle is externally connected to a mechanical seal assembly, which includes a spring seat, a rotating ring, a stationary ring, and a preload spring. The spring seat is fastened to the spindle, the stationary ring is fixedly installed in the bearing housing, the rotating ring is axially movable and installed outside the spindle, and the preload spring abuts against the spring seat and the rotating ring. The end face of the rotating ring and the end face of the stationary ring are sealed and fitted together.

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