A high-temperature vertical multi-stage centrifugal pump

Abstract

The present invention relates to the field of pumps, and particularly to a high-temperature vertical multistage centrifugal pump, which comprises a base. A water section component is connected to the base, and an outer sleeve is connected to the water section component. A cooling housing is fixed to the upper end of the outer sleeve, a heat insulation plate is fixed to the upper end of the cooling housing, a pump head is fixed to the upper end of the heat insulation plate, a bracket and a protective cover are connected to the upper end of the pump head, a motor is fixed to the upper ends of the bracket and the protective cover, a coupling is connected to the output shaft of the motor, the coupling is connected to a pump shaft, the pump shaft penetrates through the central positions of the pump head and the heat insulation plate, and an inner core component is fixed to the lower end of the pump shaft. The pump shaft comprises an upper pump shaft part, a lower pump shaft part and a U-shaped part connecting the upper pump shaft part and the lower pump shaft part. A cavity for the rotation of the U-shaped part is formed in the heat insulation plate, and a sponge block is fixed at the concave part of the U-shaped part, greatly improving the cooling effect on the pump shaft, preventing the medium steam in the pump cavity from ascending through the gap at the junction of the pump shaft and the heat insulation plate, and thus providing good protection for the motor and the like.

Description

Technical Field

[0001] The present invention relates to the field of pumps, and particularly to a high-temperature vertical multistage centrifugal pump. Background Art

[0002] With the development of technology, high-temperature centrifugal pumps are increasingly widely used. Currently, they are mainly applied in fields such as chemical industry, petroleum, metallurgy, large thermal power plants, and nuclear power plants, for transporting various media with high-temperature characteristics. Since the high-temperature vertical multistage pump operates in a high-temperature environment and transports high-temperature media as well, if the temperature in the high-temperature environment or the temperature of the media is transmitted to components such as bearings and motors through the pump shaft, it will cause damage to these components, resulting in the inability of components such as bearings and motors to operate normally, reducing the service life of components such as bearings and motors, and even posing potential safety hazards. The patent with the application number CN202323090960.5 discloses an automatically cooled bearing housing for a vertical high-temperature pump. This automatically cooled bearing housing for a vertical high-temperature pump cools the bearing housing inside the bearing mechanism through the air-cooling mechanisms installed at both upper and lower ends of the bearing mechanism. The upper and lower groups of cooling fans in the air-cooling mechanism can rotate synchronously with the bearing when the bearing rotates, generating a large amount of wind to carry away the conduction heat along the shaft and other connecting parts and the heat generated by the bearing rolling. The temperature of the bearing housing can be cooled down, preventing part loss due to high temperature and ensuring the normal operation of the pump. However, this automatically cooled bearing housing for a vertical high-temperature pump still has the following drawbacks: 1) Although the cooling fan can play a certain air-cooling role for the pump shaft, part of the heat will still be absorbed by the pump shaft and transmitted upward to the motor, causing the motor to heat up and then damaging the motor; 2) The steam of the medium in the pump cavity will rise through the gap between the pump shaft and the bearing and then reach the motor, causing wear to the bearing and the motor. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a high-temperature vertical multistage centrifugal pump, which solves the problems existing in the prior art. Through the settings of a cooling housing, a heat insulation plate, a first cooling sleeve, a second cooling sleeve, etc., the present invention greatly improves the cooling effect on the pump shaft. By setting the pump shaft to be composed of an upper pump shaft part, a lower pump shaft part, and a U-shaped part, and arranging a sponge block in the U-shaped part, it effectively prevents the medium steam in the pump cavity from rising through the gap at the junction between the pump shaft and the first cooling sleeve, the second cooling sleeve, the heat insulation plate, etc., thereby providing good protection for components such as the motor, the coupling, and the bearing.

[0004] To achieve the above object, the present invention provides the following technical solution: a high-temperature vertical multistage centrifugal pump, including a base, a water section component is connected to the base, an outer sleeve is connected to the water section component, a cooling housing is fixed to the upper end of the outer sleeve, a heat insulation plate is fixed to the upper end of the cooling housing, a pump head is fixed to the upper end of the heat insulation plate, a bracket and a protective cover are connected to the upper end of the pump head, a motor is fixed to the upper ends of the bracket and the protective cover, a coupling is connected to the output shaft of the motor, the coupling is connected to a pump shaft, the pump shaft passes through the central positions of the pump head and the heat insulation plate, and an inner core component is fixed to the lower end of the pump shaft. The pump shaft includes an upper pump shaft portion, a lower pump shaft portion, and a U-shaped portion connecting the upper pump shaft portion and the lower pump shaft portion. A cavity for the U-shaped portion to rotate is formed in the heat insulation plate, and a sponge block is fixed at the concave portion of the U-shaped portion.

[0005] Preferably, the U-shaped portion is arranged horizontally, and there is a gap between its outer bottom surface and the outer wall of the cavity. The sponge block includes a first sponge portion fixed in the U-shaped groove of the U-shaped portion. The first sponge portion is fixed with a second sponge portion. A first cylindrical block is fixed to the top surface of the second sponge portion, and a first through hole through which the upper pump shaft portion passes is formed in the first cylindrical block. A second cylindrical block is fixed to the bottom surface of the second sponge portion, and a second through hole through which the lower pump shaft portion passes is formed in the second cylindrical block.

[0006] Preferably, the side of the second sponge portion away from the first sponge portion is in contact with the outer wall of the cavity.

[0007] Preferably, a number of arc-shaped plates are evenly arranged in the first sponge portion and the second sponge portion. The arc-shaped plates protrude to the left, and springs are connected between adjacent arc-shaped plates.

[0008] Preferably, an extrusion block is fixed to the outer wall of the cavity, and the shape of the extrusion block is an inwardly convex arc shape.

[0009] Preferably, a number of columns of refractory balls are evenly fixed in the sponge block. Each column of refractory balls is composed of a number of evenly distributed hollow refractory balls. A first elastic band is fixed between the upper and lower adjacent refractory balls, and a second elastic band is fixed between the left and right two refractory balls on the same horizontal of adjacent two columns of refractory balls.

[0010] Preferably, a cooling cavity is provided in the cooling housing. The cooling housing includes a barrel-shaped housing. The top of the barrel-shaped housing is fixed with a top housing. An embedding groove is formed at the central position of the top housing, and the height of the top housing gradually decreases from the outside to the inside.

[0011] Preferably, the heat insulation plate includes an embedding portion matching the embedding groove. The upper end of the embedding portion is fixed with a heat insulation main body portion. The height of the bottom surface of the heat insulation main body portion gradually decreases from the outside to the inside. An inverted conical cavity is formed between the heat insulation main body portion and the top housing, and the inverted conical cavity is connected to the cavity through a communication channel.

[0012] Preferably, the connecting channel is arranged at the junction of the outer wall and the bottom wall of the cavity, and a flow guide plate is fixed on the bottom wall of the cavity.

[0013] Preferably, a first cooling sleeve is provided at the lower end near the upper pump shaft portion, and a second cooling sleeve is provided at the upper end near the lower pump shaft portion. Both the first cooling sleeve and the second cooling sleeve are arranged within the heat insulation plate. A plug and a bleed plug are provided on the cooling housing, and an automatic exhaust mechanism is provided on the pump head.

[0014] 1. By providing the cooling housing, the present invention not only cools the pump shaft well, preventing heat from being transferred upward through the pump shaft, but also the combination of the pump shaft and the heat insulation plate effectively blocks the heat of the medium from being transferred upward into the pump head, playing a good role in cooling and heat insulation for the inside of the pump shaft and the pump head, and ultimately playing a good protective role for components such as the motor, coupling, and bearing. Since the pump shaft needs to rotate during the operation of this centrifugal pump, there will inevitably be a certain gap at the junction between the pump shaft and components such as the heat insulation plate. This will inevitably cause some of the medium steam generated when the high-temperature medium in the outer sleeve is agitated by the inner core components to rise through this gap and enter the motor, coupling, and bearing, causing damage to them. Therefore, this problem is solved by setting the pump shaft to be composed of an upper pump shaft portion, a lower pump shaft portion, and a U-shaped portion, and fixing a sponge block in the recess of the U-shaped portion. The U-shaped portion, that is, the part protruding from the pump shaft, effectively blocks the upward movement of the medium steam by changing the original straight path into a U-shaped detour path. The recess of the U-shaped portion can play a good role in fixing the sponge block. By setting the sponge block, it can adsorb the medium steam. A small amount of the upward-moving medium steam will be adsorbed by the sponge block and stop rising as soon as it encounters the sponge block. This setting effectively prevents the medium steam from rising through the gap at the junction between the pump shaft and the heat insulation plate, and provides good protection for components such as the motor, coupling, and bearing of the vertical multi-stage centrifugal pump.

[0015] 2. The present invention sets the sponge block to be composed of a first sponge portion, a second sponge portion, a first cylindrical block, and a second cylindrical block. The first sponge portion plays a good role in fixing with the U-shaped portion, thus playing a good role in fixing the whole sponge block. The first cylindrical block wraps and fixes the upper pump shaft portion, and the second cylindrical block wraps and fixes the lower pump shaft portion. This not only has a good effect of blocking and adsorbing the medium steam rising along the pump shaft, but also plays a good limiting role for the second sponge portion. During the rotation of the pump shaft, the pump shaft drives the sponge block to rotate together. Even if some medium steam escapes into the gap, the rotation of the sponge block can adsorb the medium steam in the gap.

[0016] 3. The present invention provides a good supporting effect on the first sponge part and the second sponge part through the setting of the arc-shaped plate, which is equivalent to the role of a skeleton, while the spring plays a connecting role. In this way, during the process of the pump shaft driving the first sponge part and the second sponge part to rotate, due to the centrifugal force and the spring, the arc-shaped plate will deviate from its original position, and the distance and orientation of each arc-shaped plate deviation are not fixed. In this way, a certain degree of pulling or compression is applied to the first sponge part and the second sponge part. The pulling process can enhance the effect of the first sponge part and the second sponge part in adsorbing the medium vapor, and the compression process can play a role in squeezing the medium accumulated in the first sponge part and the second sponge part, squeezing out the liquid medium accumulated in the first sponge part and the second sponge part, thereby facilitating more effective adsorption of the medium vapor in the subsequent process.

[0017] 4. Through the setting of the extrusion block in the present invention, when the second sponge part rotates to the extrusion block, it will be fully extruded, and the medium vapor accumulated in the sponge block can be fully extruded, so that the sponge block will not be in a saturated state and always maintain the ability to adsorb the medium vapor. The shape of the extrusion block is set as an inwardly convex arc shape, so that there is a gradual process when extruding the sponge block. Since the arc-shaped plate and the spring are evenly distributed in the sponge block, the sponge block can be extruded more comprehensively and evenly.

[0018] 5. By setting refractory balls in the sponge block in the present invention, it plays a good heat absorption role and further improves the cooling effect. The first elastic band and the second elastic band are in a certain tensioned state, that is, there is a pulling force between the first elastic band and the second elastic band on the two refractory balls they connect. The refractory balls, the first elastic band and the second elastic band form a three-dimensional grid system, which plays a good shaping role on the sponge block, increases the toughness of the sponge block, prevents the fracture of the sponge block, and also greatly enhances the effect of squeezing the medium in the sponge block, making the squeezing effect on the medium adsorbed in the sponge block better and more comprehensive.

[0019] 6. Through the setting of the inverted conical cavity in the present invention, the inverted conical cavity is used to store the medium liquid extruded outside the sponge block, which not only makes reasonable use of the inverted conical cavity, but also greatly enhances the heat insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the overall schematic diagram of the present invention.

[0021] Figure 2 It is the overall schematic diagram of the pump shaft of the present invention.

[0022] Figure 3 For the present invention Figure 1 Partial schematic diagram.

[0023] Figure 4Schematic diagram of the pump shaft and sponge block of the present invention.

[0024] Figure 5 Schematic diagram of the sponge block, arc plate and spring of the present invention.

[0025] Figure 6 For the present invention Figure 3 Schematic diagram after adding the extrusion block, communication channel and diversion plate.

[0026] Figure 7 Cross-sectional view of the cavity and extrusion block of the present invention.

[0027] Figure 8 Schematic diagram of the sponge block of the present invention and the refractory ball rows therein.

[0028] Figure 9 Schematic diagram of two adjacent refractory ball rows of the present invention.

[0029] Figure 10 Overall schematic diagram of the cooling housing of the present invention.

[0030] Figure 11 Overall schematic diagram of the heat insulation board of the present invention.

[0031] In the figure: 1 - base, 2 - water section component, 3 - outer sleeve, 4 - cooling housing, 5 - heat insulation board, 6 - pump head, 7 - bracket, 8 - protective cover, 9 - motor, 10 - coupling, 11 - pump shaft, 12 - inner core component, 13 - upper pump shaft part, 14 - lower pump shaft part, 15 - U-shaped part, 16 - cavity, 17 - sponge block, 18 - outer bottom surface, 19 - gap, 20 - first sponge part, 21 - second sponge part, 22 - first cylindrical block, 23 - second cylindrical block, 24 - arc plate, 25 - spring, 26 - extrusion block, 27 - refractory ball row, 28 - refractory ball, 29 - first elastic band, 30 - second elastic band, 31 - cooling cavity, 32 - barrel-shaped housing, 33 - top housing, 34 - embedding groove, 35 - embedding part, 36 - heat insulation main body part, 37 - inverted conical cavity, 38 - communication channel, 39 - diversion plate, 40 - first cooling sleeve, 41 - second cooling sleeve, 42 - plug, 43 - air release plug, 44 - automatic exhaust mechanism. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached Figures 1 - 11 The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] The present invention provides a technical solution: a high-temperature vertical multi-stage centrifugal pump, which includes a base 1. A water section component 2 is connected to the base 1. An outer sleeve 3 is connected to the water section component 2. A cooling housing 4 is fixed to the upper end of the outer sleeve 3. A heat insulation plate 5 is fixed to the upper end of the cooling housing 4. A pump head 6 is fixed to the upper end of the heat insulation plate 5. A bracket 7 and a protective cover 8 are connected to the upper end of the pump head 6. A motor 9 is fixed to the upper ends of the bracket 7 and the protective cover 8. A coupling 10 is connected to the output shaft of the motor 9. The coupling 10 is connected to a pump shaft 11. The pump shaft 11 passes through the central positions of the pump head 6 and the heat insulation plate 5. And a core component 12 is fixed to the lower end of the pump shaft 11. The pump shaft 11 includes an upper pump shaft part 13, a lower pump shaft part 14, and a U-shaped part 15 connecting the upper pump shaft part 13 and the lower pump shaft part 14. A cavity 16 for the U-shaped part 15 to rotate is formed in the heat insulation plate 5. A sponge block 17 is fixed to the concave part of the U-shaped part 15. During operation, the motor 9 is started to drive the pump shaft 11 to rotate, and then drive the core component 12 to rotate. Among them, the core component 12 is an impeller, which is located in the outer sleeve 3. Its rotation conveys the medium to be conveyed to the place where it needs to be conveyed through the water section component 2. Among them, the water section component 2 includes an inlet section and an outlet section. The inlet section is connected to an inlet pipe, and the outlet section is connected to an outlet pipe. A mechanical seal is used for sealing between the pump shaft 11 and the pump head 6. Since the high-temperature vertical multi-stage centrifugal pump conveys high-temperature medium, the setting of the cooling housing 4 not only cools the pump shaft 11 well to prevent heat from being transmitted upward through the pump shaft 11, but also the pump shaft 11 cooperates with the setting of the heat insulation plate 5 to effectively prevent the heat of the medium from being transmitted upward into the pump head 6, playing a good role in cooling and heat insulation for the inside of the pump shaft 11 and the pump head 6, and ultimately playing a good role in protecting the motor 9, the coupling 10, the bearings, etc. Since the pump shaft 11 needs to rotate during the operation of the centrifugal pump, there will inevitably be a certain gap at the junction between the pump shaft 11 and components such as the heat insulation plate 5. This will inevitably cause part of the medium steam generated when the high-temperature medium in the outer sleeve 3 is stirred by the core component 12 to rise through this gap and enter the motor 9, the coupling 10, and the bearings, causing damage to the motor 9, the coupling 10, and the bearings. Therefore, the problem is solved by setting the pump shaft 11 to be composed of the upper pump shaft part 13, the lower pump shaft part 14, and the U-shaped part 15, and fixing a sponge block 17 at the concave part of the U-shaped part 15. Among them, the U-shaped part 15, that is, the part protruding from the pump shaft 11, effectively blocks the upward movement of the medium steam by changing the original straight path into a U-shaped detour path.The recess of the U-shaped part 15 can play a good role in fixing the sponge block 17. Through the arrangement of the sponge block 17, it can play a role in adsorbing the medium steam. A small part of the upward medium steam will be adsorbed by the sponge block 17 and stop rising as soon as it encounters the sponge block 17. This setting well prevents the medium steam from rising through the gap at the junction of the pump shaft 11 and the heat insulation plate 5, and provides good protection for components such as the motor 9, coupling 10, and bearings of the vertical multi-stage centrifugal pump.

[0034] The U-shaped part 15 is arranged horizontally, and there is a gap 19 between its outer bottom surface 18 and the outer wall of the cavity 16. The sponge block 17 includes a first sponge part 20 fixed in the U-shaped groove of the U-shaped part 15. A second sponge part 21 is fixed to the first sponge part 20. A first cylindrical block 22 is fixed to the top surface of the second sponge part 21. A first through hole through which the upper pump shaft part 13 passes is provided on the first cylindrical block 22. A second cylindrical block 23 is fixed to the bottom surface of the second sponge part 21. A second through hole through which the lower pump shaft part 14 passes is provided on the second cylindrical block 23. Among them, the first sponge part 20 plays a good role in fixing with the U-shaped part 15, and thus plays a good role in fixing the whole sponge block 17. The first cylindrical block 22 wraps and fixes the upper pump shaft part 13, and the second cylindrical block 23 wraps and fixes the lower pump shaft part 14. In this way, it not only has a good blocking and adsorption effect on the medium steam rising along the pump shaft 11, but also plays a good limiting role on the second sponge part 21. During the rotation of the pump shaft 11, the pump shaft 11 drives the sponge block 17 to rotate together. Even if some medium steam escapes into the gap 19, the rotation of the sponge block 17 can adsorb the medium steam in the gap 19. Therefore, the horizontally arranged U-shaped part 15 and the sponge block 17 with this structure well prevent the medium steam from rising through the gap into components such as the motor 9, coupling 10, and bearings.

[0035] One side of the second sponge part 21 away from the first sponge part 20 is in contact with the outer wall of the cavity 16. The cavity 16 is cylindrical, and the outer wall of the second sponge part 21 is tangent to the inner wall of the cavity 16. In this way, the contact surface between the second sponge part 21 and the inner wall of the cavity 16 is the smallest, its rotation resistance is the smallest, the influence on the rotation of the pump shaft 11 is the smallest, and at the same time, the second sponge part 21 can cover the entire cavity 16 during the rotation process, with a wide coverage area.

[0036] A plurality of arc plates 24 are evenly arranged in the first sponge part 20 and the second sponge part 21, and the arc plates 24 protrude to the left. Springs 25 are connected between adjacent arc plates 24, wherein the arrangement of the arc plates 24 plays a good supporting role for the first sponge part 20 and the second sponge part 21, which is equivalent to the role of a skeleton, and the springs 25 play a connecting role. In this way, in the process of the pump shaft 11 driving the first sponge part 20 and the second sponge part 21 to rotate, due to the centrifugal force and the springs 25, the arc plates 24 will deviate from their original positions, and the deviation distance and orientation of each arc plate 24 are not fixed, so that the first sponge part 20 and the second sponge part 21 are pulled or compressed to a certain extent, and the pulling process can enhance the effect of the first sponge part 20 and the second sponge part 21 on adsorbing medium vapor, and the compression process can play the role of squeezing the medium gathered in the first sponge part 20 and the second sponge part 21, and squeeze out the liquid medium gathered in the first sponge part 20 and the second sponge part 21, thereby facilitating the subsequent more effective adsorption of medium vapor.

[0037] The outer wall of the cavity 16 is fixed with a squeezing block 26, and the squeezing block 26 is in the shape of an arc convex inwardly. When the second sponge part 21 rotates to the squeezing block 26, it will be fully squeezed, so that the medium vapor gathered in the sponge block 17 can be fully squeezed, so that the sponge block 17 will not be in a saturated state and can always maintain the ability to absorb the medium vapor. The squeezing block 26 is shaped as an arc convex inwardly, so that there is a gradual process when squeezing the sponge block 17. Since the arc plates 24 and springs 25 are evenly distributed in the sponge block 17, the sponge block 17 can be squeezed more comprehensively and evenly. A certain space is left between the bottom surface of the second sponge part 21 and the inner bottom surface of the cavity 16, and the space is used to receive the medium liquid squeezed out of the sponge block 17.

[0038] A number of refractory ball columns 27 are evenly fixed within the sponge block 17. Each refractory ball column 27 is composed of a number of evenly distributed hollow refractory balls 28. A first elastic band 29 is fixed between two vertically adjacent refractory balls 28, and a second elastic band 30 is fixed between the left and right refractory balls 28 at the same horizontal level of two adjacent refractory ball columns 27. Among them, the refractory balls 28 within the sponge block 17 play a very good heat absorption role. Setting the refractory balls 28 as hollow can reduce the overall weight of the sponge block 17. The first elastic band 29 and the second elastic band 30 are in a certain tension state, that is to say, there is a tensile force between the first elastic band 29 and the second elastic band 30 and the two refractory balls 28 they connect. The refractory balls 28, the first elastic band 29, and the second elastic band 30 form a three-dimensional grid system, which plays a very good shaping role for the sponge block 17, increases the toughness of the sponge block 17, prevents the fracture of the sponge block, and also greatly enhances the effect of squeezing the medium within the sponge block 17, making the squeezing effect on the medium adsorbed within the sponge block 17 better and more comprehensive.

[0039] A cooling cavity 31 is provided within the cooling housing 4. The cooling housing 4 includes a barrel-shaped housing 32. A top housing 33 is fixed to the top of the barrel-shaped housing 32. An embedding groove 34 is provided at the central position of the top housing 33. The height of the top housing 33 gradually decreases from the outside to the inside. Among them, air or cold water and other cooling media are passed through the cooling cavity 31 for cooling. The cooling cavity 31 can be externally connected to a cooling medium circulation device. For example, the cooling cavity 31 can be connected to a coolant tank through a circulation pipe. The coolant in the coolant tank enters the cooling cavity 31 through the circulation pipe to cool the cooling housing 4 and then returns to the coolant tank. In this way, the cooling housing 4 is cooled in a cycle. This cooling method belongs to the prior art and will not be elaborated here. Both the barrel-shaped housing 32 and the top housing 33 are provided with the cooling cavity 31 and are connected to each other. The cooling housing 4 with this structure forms a wrapped cooling, greatly improving the cooling range and cooling effect. The height of the top housing 33 gradually decreases from the outside to the inside. Through this setting, the top housing 33 is conical. On the one hand, it enhances the support strength for the heat insulation plate 5 and improves the stability. On the other hand, it can make the water droplets condensed on the lower surface of the top housing 33 due to the cooling of the top housing 33 flow quickly from the outside to the middle, so that the water droplets with a relatively low temperature on the lower surface of the top housing 33 return to the high-temperature medium again, playing a certain cooling role for the high-temperature medium, thereby improving the overall cooling effect.

[0040] The heat insulation plate 5 includes an embedding part 35 that matches the embedding groove 34. The upper end of the embedding part 35 is fixed with a heat insulation main body part 36. The height of the bottom surface of the heat insulation main body part 36 gradually decreases from the outside to the inside. An inverted conical cavity 37 is formed between the heat insulation main body part 36 and the top shell 33. The inverted conical cavity 37 is connected to the cavity 16 through a communication channel 38. Among them, through the settings of the embedding groove 34 and the embedding part 35, compared with the conventional threaded connection method, the connection and fixation of the heat insulation plate 5 and the cooling shell 4 are greatly facilitated, the installation is more convenient and efficient, the coaxial accuracy of part processing is easier to ensure, and the processing efficiency is higher. An O-ring is used for sealing between the embedding groove 34 and the embedding part 35. The embedding part 35 is embedded in the cooling shell 4, greatly improving the cooling and heat insulation effects at the junction with the pump shaft 11. The inverted conical cavity 37 is used to temporarily store the extruded medium. The medium liquid extruded from the sponge block 17 enters the inverted conical cavity 37 through the communication channel 38 and is collected. Storing the medium liquid in the inverted conical cavity 37 has a better heat insulation effect compared to an empty inverted conical cavity 37. Because if the medium is a liquid such as water or oil, its specific heat capacity is larger than that of air. Therefore, using the inverted conical cavity 37 to store the medium liquid outside the extruded sponge block 17 not only makes reasonable use of the inverted conical cavity 37 but also enhances the heat insulation effect. To prevent the situation where the inverted conical cavity 37 is full of medium and cannot accommodate the subsequent medium extruded from the sponge block 17, a channel connecting the inverted conical cavity 37 and the outside can be set in the heat insulation main body part 36. A fixed pipe can be passed through this channel. One end of the pipe extends into the inverted conical cavity 37, and the other end extends outside the heat insulation main body part 36. A detachable end cap is provided at the exposed end of the pipe. In this way, the medium liquid in the inverted conical cavity 37 can be suctioned through a suction device (such as a syringe) at regular intervals, and the suctioned medium can still be recycled.

[0041] The communication channel 38 is arranged at the junction of the outer wall and the bottom wall of the cavity 16. A deflector 39 is fixed on the bottom wall of the cavity 16. There is a certain gap between the inner end of the deflector 39 and the inner end of the U-shaped part 15, so as not to affect the rotation of the U-shaped part 15. Through the setting of the deflector 39, it plays a good guiding role for the medium liquid extruded from the sponge block 17, guiding the medium liquid to the position of the communication channel 38, facilitating the medium liquid to flow into the inverted conical cavity 37.

[0042] A first cooling sleeve 40 is provided at the lower end near the upper pump shaft portion 13, and a second cooling sleeve 41 is provided at the upper end near the lower pump shaft portion 14. Both the first cooling sleeve 40 and the second cooling sleeve 41 are arranged within the heat insulation plate 5. A plug 42 and a bleed plug 43 are provided on the cooling housing 4, and an automatic exhaust mechanism 44 is provided on the pump head 6. The arrangement of the first cooling sleeve 40 and the second cooling sleeve 41 not only further enhances the cooling and heat insulation effect, but also forms the cooling sleeves into an upper and lower two-section structure. Compared with the integral structure, the two-section structure significantly reduces the cost of part processing. The upper and lower two-section sealing structure ensures a smaller flow with less stalling. The middle metal section has a better heat dissipation effect, greatly enhancing the cooling effect. In order to better prevent the upward movement of the medium vapor, a combination of several groups of U-shaped portions 15 and sponge blocks 17 can be arranged from top to bottom on the pump shaft 11 portion between the first cooling sleeve 40 and the second cooling sleeve 41. Through the arrangement of the plug 42 and the bleed plug 43, the cooling effect is further enhanced. The automatic exhaust mechanism 44 can play the role of automatically exhausting gas. In case of problems in the previous links, it can exhaust high-temperature gas and play a protective role for the bearings and the motor.

[0043] Working principle: During operation, the motor 9 starts, driving the pump shaft 11 to rotate, and then driving the inner core component 12 to rotate. The inner core component 12 is an impeller, which is located inside the outer sleeve 3. Its rotation transports the medium to be conveyed to the place where it needs to be conveyed through the water section component 2. The water section component 2 includes an inlet section and an outlet section. The inlet section is connected to the inlet pipe, and the outlet section is connected to the outlet pipe. The pump shaft 11 and the pump head 6 are sealed by a mechanical seal. Since the high-temperature vertical multistage centrifugal pump conveys high-temperature medium, the setting of the cooling housing 4 not only cools the pump shaft 11 well, preventing heat from being transferred upward through the pump shaft 11, but also the setting of the pump shaft 11 in cooperation with the heat insulation plate 5 effectively blocks the heat of the medium from being transferred upward into the pump head 6, playing a good role in cooling and heat insulation for the inside of the pump shaft 11 and the pump head 6, and ultimately playing a good role in protecting the motor 9, the coupling 10, the bearings, etc. Since the pump shaft 11 needs to rotate during the operation of the centrifugal pump, there will inevitably be a certain gap at the junction between the pump shaft 11 and components such as the heat insulation plate 5. This will inevitably cause part of the medium steam generated when the high-temperature medium in the outer sleeve 3 is agitated by the inner core component 12 to rise through this gap and enter the motor 9, the coupling 10, and the bearings, causing damage to the motor 9, the coupling 10, and the bearings. Therefore, the problem is solved by setting the pump shaft 11 to be composed of an upper pump shaft part 13, a lower pump shaft part 14, and a U-shaped part 15, and a sponge block 17 is fixed in the recess of the U-shaped part 15. The U-shaped part 15, that is, the part protruding from the pump shaft 11, effectively blocks the upward movement of the medium steam by changing the original straight path into a U-shaped detour path. The recess of the U-shaped part 15 can play a good role in fixing the sponge block 17. Through the setting of the sponge block 17, it can adsorb the medium steam. A small part of the upward-moving medium steam will be adsorbed by the sponge block 17 and stop moving upward as soon as it encounters the sponge block 17. This setting effectively blocks the upward movement of the medium steam through the gap at the junction between the pump shaft 11 and the heat insulation plate 5, and well protects components such as the motor 9, the coupling 10, and the bearings of the vertical multistage centrifugal pump.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature vertical multistage centrifugal pump, characterized in that: The invention comprises a base (1), the base (1) being connected to a water section component (2), the water section component (2) being connected to an outer sleeve (3), the upper end of the outer sleeve (3) being fixed to a cooling shell (4), the upper end of the cooling shell (4) being fixed to a heat insulation board (5), the upper end of the heat insulation board (5) being fixed to a pump head (6), the upper end of the pump head (6) being connected to a bracket (7) and a protective cover (8), the upper ends of the bracket (7) and the protective cover (8) being fixed to a motor (9), the output shaft of the motor (9) being connected to a coupling (10), The coupling (10) is connected to a pump shaft (11), the pump shaft (11) passes through the center of the pump head (6) and the heat insulation board (5), and an inner core component (12) is fixed to the lower end of the pump shaft (11), the pump shaft (11) comprises an upper pump shaft portion (13), a lower pump shaft portion (14), and a U-shaped portion (15) connecting the upper pump shaft portion (13) and the lower pump shaft portion (14), the heat insulation board (5) is provided with a cavity (16) in which the U-shaped portion (15) rotates, and a sponge block (17) is fixed to the recess of the U-shaped portion (15).

2. A high temperature vertical multistage centrifugal pump according to claim 1, characterized in that: The U-shaped portion (15) is arranged to be horizontal, and a gap (19) is left between its outer bottom surface (18) and the outer wall of the cavity (16); the sponge block (17) comprises a first sponge portion (20) fixed in the U-shaped groove of the U-shaped portion (15); the first sponge portion (20) is fixed with a second sponge portion (21); a first cylindrical block (22) is fixed to the top surface of the second sponge portion (21); a first through hole is formed on the first cylindrical block (22) through which the upper pump shaft portion (13) passes; a second cylindrical block (23) is fixed on the bottom surface of the second sponge portion (21); a second through hole is formed on the second cylindrical block (23) through which the lower pump shaft portion (14) passes.

3. A high temperature vertical multistage centrifugal pump according to claim 2, characterized in that: A side of the second sponge portion (21) away from the first sponge portion (20) is in contact with an outer wall of the cavity (16).

4. A high temperature vertical multistage centrifugal pump according to claim 2, characterized in that: A plurality of arc-shaped plates (24) are evenly arranged in the first sponge portion (20) and the second sponge portion (21); the arc-shaped plates (24) protrude to the left, and springs (25) are connected between adjacent arc-shaped plates (24).

5. A high temperature vertical multistage centrifugal pump according to claim 4, characterized in that: An extrusion block (26) is fixed on the outer wall of the cavity (16), and the shape of the extrusion block (26) is an inwardly convex arc shape.

6. A high temperature vertical multistage centrifugal pump according to claim 2, characterized in that: A plurality of rows of refractory balls (27) are evenly fixed in the sponge block (17), each row of the refractory balls (27) is composed of a plurality of evenly distributed hollow refractory balls (28), a first elastic band (29) is fixed between two upper and lower adjacent refractory balls (28), and a second elastic band (30) is fixed between two left and right refractory balls (28) at the same level of two adjacent rows of the refractory balls (27).

7. A high temperature vertical multistage centrifugal pump according to claim 1, characterized in that: A cooling cavity (31) is provided in the cooling shell (4), and the cooling shell (4) comprises a barrel-shaped shell (32). A top shell (33) is fixed to the top of the barrel-shaped shell (32), an embedding groove (34) is provided at the center of the top shell (33), and the height of the top shell (33) gradually decreases from the outside to the inside.

8. A high temperature vertical multistage centrifugal pump according to claim 7, characterized in that: The heat insulation board (5) comprises an embedding portion (35) matching the embedding groove (34); a heat insulation main body (36) is fixed to the upper end of the embedding portion (35); the height of the bottom surface of the heat insulation main body (36) gradually decreases from the outside to the inside; an inverted cone-shaped cavity (37) is formed between the heat insulation main body (36) and the top shell (33); and the inverted cone-shaped cavity (37) is connected to the cavity (16) via a connecting channel (38).

9. A high temperature vertical multistage centrifugal pump according to claim 8, characterized in that: The communication channel (38) is arranged at the junction of the outer wall and the bottom wall of the cavity (16), and a guide plate (39) is fixed on the bottom wall of the cavity (16).

10. A high temperature vertical multistage centrifugal pump according to claim 1, characterized in that: A first cooling jacket (40) is provided near the lower end of the upper pump shaft (13), and a second cooling jacket (41) is provided near the upper end of the lower pump shaft (14). The first cooling jacket (40) and the second cooling jacket (41) are both arranged in the heat insulation board (5). A screw plug (42) and a venting screw plug (43) are provided on the cooling shell (4), and an automatic exhaust mechanism (44) is provided on the pump head (6).

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