High-temperature type vertical multi-stage centrifugal pump

Abstract

The invention relates to the field of pumps, in particular to a high-temperature type vertical multi-stage centrifugal pump which comprises a base, a water section component connected to the base, an outer sleeve connected to the water section component, a cooling shell fixed to the upper end of the outer sleeve, a heat insulation plate fixed to the upper end of the cooling shell, and a pump head fixed to the upper end of the heat insulation plate. The upper end of the pump head is connected with a support and a protective cover, a motor is fixed to the upper ends of the support and the protective cover, an output shaft of the motor is connected with a coupler, the coupler is connected with a pump shaft, the pump shaft penetrates through the pump head and the center of 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 connected with the upper pump shaft part and the lower pump shaft part, a cavity in which the U-shaped part rotates is formed in the heat insulation plate, and a sponge block is fixed to the concave position of the U-shaped part, so that the cooling effect on the pump shaft is greatly improved, medium steam in the pump cavity is prevented from ascending through a gap at the junction of the pump shaft and the heat insulation plate, and the heat insulation effect is improved. Therefore, the motor and the like are well protected.

Description

Technical Field

[0001] The invention relates to the field of pumps, and in particular to a high-temperature vertical multi-stage centrifugal pump. Background Art

[0002] With the development of science and technology, high temperature centrifugal pumps are being used more and more widely. They are currently mainly used in the fields of chemical industry, petroleum, metallurgy, large thermal power, nuclear power, etc., to transport various media with high temperature characteristics. Since high temperature vertical multistage pumps work in a high temperature environment and also transport high temperature media, if the temperature in the high temperature environment or the temperature of the medium is transmitted to bearings, motors and other components through the pump shaft, it will cause damage to bearings, motors and other components, causing bearings, motors and other components to fail to work properly, reducing the service life of bearings, motors and other components, and even more serious safety hazards. The patent with application number CN202323090960.5 discloses an automatic cooling vertical high-temperature pump bearing body. The automatic cooling vertical high-temperature pump bearing body uses an air-cooling cooling mechanism installed at the upper and lower ends of the bearing mechanism to cool the bearing body inside the bearing mechanism. The upper and lower sets of cooling fans in the air-cooling cooling mechanism can rotate synchronously with the bearing when the bearing rotates, generating a large amount of wind to take away the conduction heat along the shaft and other connecting parts and the heat generated by the rolling of the bearing, so as to cool down the temperature of the bearing body, prevent the loss of parts due to high temperature, and ensure the normal operation of the pump. However, the high-temperature pump bearing body still has the following disadvantages during automatic cooling: 1) Although the cooling fan can play a certain air-cooling role on the pump shaft, part of the heat will still be absorbed by the pump shaft and transferred upward to the motor, causing the motor to heat up and then damage the motor; 2) The vapor of the medium in the pump chamber will go up through the gap between the pump shaft and the bearing, and then reach the motor, causing loss to the bearing and the motor. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a high-temperature vertical multi-stage centrifugal pump, which solves the problems existing in the prior art. The present invention greatly improves the cooling effect on the pump shaft by arranging a cooling shell, a heat insulation plate, a first cooling jacket and a second cooling jacket, and by arranging the pump shaft to be composed of an upper pump shaft portion, a lower pump shaft portion and a U-shaped portion, and arranging a sponge block in the U-shaped portion, the medium vapor in the pump chamber is effectively prevented from ascending through the gap at the junction between the pump shaft and the first cooling jacket, the second cooling jacket, the heat insulation plate, etc., thereby providing good protection for the motor, coupling and bearings.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-temperature vertical multi-stage centrifugal pump, comprising a base, a water section component connected to the base, an outer sleeve connected to the water section component, a cooling shell fixed to the upper end of the outer sleeve, a heat insulation board fixed to the upper end of the cooling shell, a pump head fixed to the upper end of the heat insulation board, a bracket and a protective cover connected to the upper end of the pump head, a motor fixed to the upper ends of the bracket and the protective cover, a coupling connected to the output shaft of the motor, a pump shaft connected to the coupling, the pump shaft passes through the center position of the pump head and the heat insulation board, and an inner core component is fixed to the lower end of the pump shaft, the pump shaft comprises 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 rotation of the U-shaped portion is opened in the heat insulation board, and a sponge block is fixed to the recess of the U-shaped portion.

[0005] Preferably, the U-shaped portion is arranged horizontally, with a gap between its outer bottom surface and the outer wall of the cavity, and 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 with a top surface of the second sponge portion, a first through hole is provided on the first cylindrical block for the upper pump shaft portion to pass through, a second cylindrical block is fixed with a second through hole is provided on the bottom surface of the second sponge portion, and a second cylindrical block is provided with a second through hole for the lower pump shaft portion to pass through.

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

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

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

[0009] Preferably, several rows of refractory balls are evenly fixed in the sponge block, each row of refractory balls is composed of several evenly distributed hollow refractory balls, a first elastic band is fixed between two adjacent refractory balls, and a second elastic band is fixed between the left and right refractory balls on the same level of two adjacent rows of refractory balls.

[0010] Preferably, a cooling cavity is provided in the cooling shell, and the cooling shell comprises a barrel-shaped shell, a top shell is fixed on the top of the barrel-shaped shell, an embedding groove is provided at the center of the top shell, and the height of the top shell decreases gradually from the outside to the inside.

[0011] Preferably, the insulation board includes an embedded portion matching the embedded groove, an insulation main body portion is fixed to the upper end of the embedded portion, the height of the bottom surface of the insulation main body portion gradually decreases from the outside to the inside, and an inverted cone cavity is formed between the insulation main body portion and the top shell, and the inverted cone cavity is connected to the cavity through a connecting channel.

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

[0013] Preferably, a first cooling jacket is provided near the lower end of the upper pump shaft, and a second cooling jacket is provided near the upper end of the lower pump shaft. The first cooling jacket and the second cooling jacket are both arranged in the insulation board, a screw plug and a vent screw plug are provided on the cooling shell, and an automatic exhaust mechanism is provided on the pump head.

[0014] 1. The present invention not only cools the pump shaft well through the setting of the cooling shell to prevent heat from being transferred upward through the pump shaft, but also the setting of the pump shaft and the heat insulation plate well prevents the heat of the medium from being transferred upward to the pump head, which plays a good cooling and heat insulation role for the pump shaft and the inside of the pump head, and finally plays a good protective role for the motor, coupling and bearings. Since the pump shaft of the centrifugal pump needs to rotate during operation, there will inevitably be a certain gap at the junction between the pump shaft and the heat insulation plate and other components, which will inevitably cause the medium steam generated when the high-temperature medium in the outer sleeve is stirred by the inner core component to go up through the gap and enter the motor, coupling and bearings, causing damage to the motor, coupling and bearings. Therefore, this problem is solved by configuring the pump shaft to consist 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, wherein the U-shaped portion, that is, the portion protruding from the pump shaft, effectively blocks the upward movement of the medium vapor by converting the original straight path into a U-shaped circuitous path; wherein the recess of the U-shaped portion can play a role in fixing the sponge block well, and the sponge block can be used to absorb the medium vapor, and a small amount of the upward medium vapor will be absorbed by the sponge block and stop ascending once it encounters the sponge block. This arrangement effectively prevents the medium vapor from ascending through the gap at the junction of the pump shaft and the insulation board, and provides good protection for the motor, coupling, bearings and other components of the vertical multi-stage centrifugal pump.

[0015] 2. The present invention arranges the sponge block to consist of a first sponge part, a second sponge part, a first cylindrical block and a second cylindrical block, wherein the first sponge part plays a good fixing role with the U-shaped part, and thus plays a good fixing role on the sponge block as a whole, wherein the first cylindrical block wraps and fixes the upper pump shaft part, and the second cylindrical block wraps and fixes the lower pump shaft part, which not only has a good blocking and adsorption effect on the medium vapor ascending along the pump shaft, but also has a good limiting effect on the second sponge part; wherein during the rotation of the pump shaft, the pump shaft drives the sponge block to rotate together, even if part of the medium vapor escapes into the gap, the medium vapor in the gap can be adsorbed by the rotation of the sponge block.

[0016] 3. The present invention provides an arc-shaped plate to provide a good support for the first sponge part and the second sponge part, which is equivalent to the role of a skeleton, and the spring plays a connecting role. In this way, when the pump shaft drives the first sponge part and the second sponge part to rotate, the centrifugal force and the spring will cause the arc-shaped plate to deviate from its original position, and the deviation distance and orientation of each arc-shaped plate are not fixed. In this way, the first sponge part and the second sponge part are pulled or compressed to a certain extent, and 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 squeeze the medium accumulated in the first sponge part and the second sponge part, and squeeze out the liquid medium accumulated in the first sponge part and the second sponge part, thereby facilitating the subsequent more effective adsorption of the medium vapor.

[0017] 4. The present invention sets a squeezing block so that the second sponge part will be fully squeezed when it rotates to the squeezing block, and the medium vapor accumulated in the sponge block can be fully squeezed, so that the sponge block will not be in a saturated state and can always maintain the ability to absorb medium vapor. The shape of the squeezing block is set to an inwardly convex arc shape, so there is a gradual process when squeezing the sponge block. Since the arc plates and springs are evenly distributed in the sponge block, the sponge block can be squeezed more comprehensively and evenly.

[0018] 5. The present invention arranges refractory balls in the sponge block to achieve good heat absorption and further improve the cooling effect, wherein the first elastic band and the second elastic band are in a certain tensioned state, that is, there is tension between the first elastic band and the second elastic band and the two refractory balls connected to them. The refractory balls, the first elastic band and the second elastic band form a three-dimensional grid system, which has a good shaping effect on the sponge block, increases the toughness of the sponge block, and prevents the sponge block from breaking. In addition, it also greatly enhances the effect of squeezing the medium in the sponge block, so that the squeezing effect on the medium adsorbed in the sponge block is better and more comprehensive.

[0019] 6. The present invention uses an inverted cone-shaped cavity to store the medium liquid squeezed out of the sponge block, which not only makes reasonable use of the inverted cone-shaped cavity but also greatly enhances the heat insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 It is an 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 4It is a schematic diagram of the pump shaft and sponge block of the present invention.

[0024] Figure 5 It is a 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, connecting channel and guide plate.

[0026] Figure 7 It is a cross-sectional schematic diagram of the cavity and the extrusion block of the present invention.

[0027] Figure 8 The schematic diagram of the sponge block of the present invention and the refractory ball array therein is shown in FIG.

[0028] Fig. 9 It is a schematic diagram of two adjacent rows of refractory balls of the present invention.

[0029] Fig.10 It is an overall schematic diagram of the cooling shell of the present invention.

[0030] Fig.11 It is an 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 shell, 5-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, 14-lower pump shaft, 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 chamber, 32-barrel-shaped shell, 33-top shell, 34-embedded groove, 35-embedded part, 36-insulating main body, 37-inverted cone cavity, 38-connecting channel, 39-guide plate, 40-first cooling jacket, 41-second cooling jacket, 42-screw plug, 43-venting screw plug, 44-automatic exhaust mechanism. DETAILED DESCRIPTION

[0032] The following will be combined with the attached embodiment of the present invention Figure 1-Figure 11 The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention provides a technical solution: a high-temperature vertical multistage centrifugal pump, comprising 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 shell 4 is fixed to the upper end of the outer sleeve 3, a heat insulation board 5 is fixed to the upper end of the cooling shell 4, a pump head 6 is fixed to the upper end of the heat insulation board 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, a pump shaft 11 is connected to the coupling 10, the pump shaft 11 passes through the center position 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, and the pump shaft 11 includes an upper pump shaft The heat insulation board 5 is provided with a cavity 16 for the rotation of the U-shaped portion 15, and a sponge block 17 is fixed at the depression of the U-shaped portion 15. When working, the motor 9 starts to drive the pump shaft 11 to rotate, and then drives the inner core component 12 to rotate, wherein the inner core component 12 is an impeller, which is located in the outer sleeve 3, and its rotation transports the medium to be transported to the place where it is needed to be transported through the water segment component 2, wherein the water segment component 2 includes a water inlet section and a water outlet section, wherein the water inlet section is connected to the water inlet pipe, and the water outlet section is connected to the water outlet pipe, wherein the pump shaft 11 and the pump head 6 are sealed by a mechanical seal. Since the high-temperature vertical multi-stage centrifugal pump conveys high-temperature medium, the setting of the cooling shell 4 not only cools the pump shaft 11 well to prevent heat from being transferred upward through the pump shaft 11, but also the pump shaft 11 cooperates with the setting of the insulation plate 5 to well prevent the heat of the medium from being transferred upward to the pump head 6, which has a good cooling and heat-insulating effect on the pump shaft 11 and the interior of the pump head 6, and ultimately plays a good protective role on the motor 9, the coupling 10 and the bearings. Since the pump shaft 11 of the centrifugal pump needs to rotate during operation, a certain gap is bound to be left at the junction between the pump shaft 11 and components such as the insulation board 5. This will inevitably cause the medium vapor generated when the high-temperature medium in the outer sleeve 3 is stirred by the inner core component 12 to partially flow upward through the gap and enter the motor 9, the coupling 10 and the bearing, causing damage to the motor 9, the coupling 10 and the bearing. Therefore, this problem is solved by configuring the pump shaft 11 to consist of an upper pump shaft portion 13, a lower pump shaft portion 14 and a U-shaped portion 15, and fixing a sponge block 17 in the recess of the U-shaped portion 15, wherein the U-shaped portion 15, that is, the portion protruding from the pump shaft 11, effectively blocks the upward movement of the medium vapor by converting the original straight path into a U-shaped detour path.The concave part of the U-shaped part 15 can play a role in fixing the sponge block 17 well. The sponge block 17 can be arranged to absorb the medium vapor. A small amount of the upward medium vapor will be absorbed by the sponge block 17 and stop ascending once it encounters the sponge block 17. This arrangement effectively prevents the medium vapor from ascending through the gap at the junction of the pump shaft 11 and the insulation board 5, and provides good protection for the motor 9, coupling 10, bearings and other components of the vertical multi-stage centrifugal pump.

[0034] 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 includes 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 provided on the first cylindrical block 22 for the upper pump shaft portion 13 to pass through, a second cylindrical block 23 is fixed on the bottom surface of the second sponge portion 21, a second through hole is provided on the second cylindrical block 23 for the lower pump shaft portion 14 to pass through, wherein the first sponge portion 20 plays a good fixing role with the U-shaped portion 15, and then plays a good fixing role for the sponge block 17 as a whole, wherein the first cylindrical block 22 wraps and fixes the upper pump shaft portion 13, and the second cylindrical block 23 wraps and fixes the lower pump shaft portion 14, which not only has a good blocking and adsorption effect on the medium vapor ascending along the pump shaft 11, but also plays a good limiting role for the second sponge portion 21. During the rotation of the pump shaft 11, the pump shaft 11 drives the sponge block 17 to rotate together. Even if part of the medium vapor escapes into the gap 19, the rotation of the sponge block 17 can adsorb the medium vapor in the gap 19. Therefore, the U-shaped portion 15 arranged laterally and the sponge block 17 of this structure well prevent the medium vapor from passing through the gap to the motor 9, the coupling 10, the bearing and other components.

[0035] The side of the second sponge part 21 away from the first sponge part 20 contacts the outer wall of the cavity 16, wherein 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, so that the contact area between the second sponge part 21 and the inner wall of the cavity 16 is the smallest, and the resistance to its rotation is also the smallest, and the impact on the rotation of the pump shaft 11 is the smallest. At the same time, the second sponge part 21 can cover the entire cavity 16 during the rotation process, and the coverage area is wide.

[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] Several rows of refractory balls 27 are evenly fixed in the sponge block 17, each row of refractory balls 27 is composed of several evenly distributed hollow refractory balls 28, a first elastic band 29 is fixed between two 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 refractory balls 27, wherein the refractory balls 28 in the sponge block 17 play a good heat absorption role, wherein the refractory balls 28 are set to be hollow to 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, the first elastic band 29 and the second elastic band 30 have a pulling force between the two refractory balls 28 connected to them, and the refractory balls 28, the first elastic band 29 and the second elastic band 30 form a three-dimensional grid system, which plays a good shaping role on the sponge block 17, increases the toughness of the sponge block 17, and prevents the sponge block from breaking. In addition, it also greatly enhances the effect of squeezing the medium in the sponge block 17, so that the squeezing effect of the medium adsorbed in the sponge block 17 is better and more comprehensive.

[0039] A cooling chamber 31 is provided in the cooling shell 4. The cooling shell 4 includes a barrel-shaped shell 32. A top shell 33 is fixed on the top of the barrel-shaped shell 32. An embedding groove 34 is provided at the center of the top shell 33. The height of the top shell 33 gradually decreases from the outside to the inside. The cooling chamber 31 is cooled by a cooling medium such as air or cold water. The cooling chamber 31 can be connected to an external cooling medium circulation device. For example, the cooling chamber 31 can be connected to a cooling liquid tank through a circulation pipe. The coolant in the cooling liquid tank enters the cooling chamber 31 through the circulation pipe to cool the cooling shell 4 and then returns to the cooling liquid tank. In this way, the cooling shell 4 is cooled in a reciprocating cycle. This cooling method belongs to the prior art and will not be described here. The cooling chamber 31 is provided in both the barrel-shaped shell 32 and the top shell 33 and is connected to each other. The cooling shell 4 of this structure forms a wrapped cooling, which greatly improves the cooling range and cooling effect. The height of the top shell 33 decreases gradually from the outside to the inside. This configuration makes the top shell 33 conical. On the one hand, this enhances the support strength of the heat insulation board 5 and improves stability. On the other hand, it allows the water droplets condensed on the lower surface of the top shell 33 due to the cooling of the top shell 33 to flow quickly from the outside to the middle, so that the water droplets on the lower surface of the top shell 33 with a relatively low temperature return to the high-temperature medium, which has a certain cooling effect on the high-temperature medium, thereby improving the overall cooling effect.

[0040] The heat insulation board 5 includes an embedding portion 35 matching the embedding groove 34, and 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 cavity 37 is formed between the heat insulation main body 36 and the top shell 33. The inverted cone cavity 37 is connected to the cavity 16 through a connecting channel 38. The setting of the embedding groove 34 and the embedding portion 35 greatly facilitates the connection and fixation of the heat insulation board 5 and the cooling shell 4 compared to the conventional threaded connection method, and the installation is more convenient and efficient. The coaxial accuracy of the parts processing is easier to ensure, and the processing efficiency is higher. The embedding groove 34 and the embedding portion 35 are sealed by an O-ring. The embedding portion 35 is embedded in the cooling shell 4, which greatly improves the cooling and heat insulation effect at the junction with the pump shaft 11. The inverted cone cavity 37 is used to temporarily store the squeezed medium, wherein the medium liquid squeezed out of the sponge block 17 enters the inverted cone cavity 37 through the connecting channel 38 and is collected. The medium liquid stored in the inverted cone cavity 37 has a better heat insulation effect than the empty inverted cone cavity 37, because if the medium is water, oil or other liquid, its specific heat capacity is larger than that of air. Therefore, using the inverted cone cavity 37 to store the medium liquid squeezed out of the sponge block 17 not only makes reasonable use of the inverted cone cavity 37, but also enhances the heat insulation effect. In order to avoid the situation where the inverted cone cavity 37 is filled with medium and cannot accommodate the medium squeezed out from the sponge block 17 later, a channel connecting the inverted cone cavity 37 and the outside can be set in the insulation main body 36, and a fixed pipe can be passed through the channel, one end of the pipe extends into the inverted cone cavity 37, and the other end extends out of the insulation main body 36, wherein a detachable end cap is provided on the end of the pipe exposed to the outside, so that the medium liquid in the inverted cone cavity 37 can be sucked out by a suction device (such as a syringe) at regular intervals, and the sucked out medium can also be recycled.

[0041] The connecting channel 38 is arranged at the junction of the outer wall and the bottom wall of the cavity 16. A guide plate 39 is fixed on the bottom wall of the cavity 16, wherein a certain gap is left between the inner end of the guide plate 39 and the inner end of the U-shaped portion 15, so as not to affect the rotation of the U-shaped portion 15. Through the setting of the guide plate 39, a good guiding effect is played on the medium liquid of the squeezed sponge block 17, and the medium liquid is guided to the position of the connecting channel 38, so as to facilitate the medium liquid to flow into the inverted cone cavity 37.

[0042] 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. The arrangement of the first cooling jacket 40 and the second cooling jacket 41 further improves the cooling and heat insulation effect on the one hand, and the cooling jacket is arranged in the form of a first cooling jacket 40 and a second cooling jacket 41 upper and lower two-stage structure on the other hand. The two-stage structure greatly reduces the cost of parts processing compared to the whole-stage structure. The upper and lower two-stage sealing structure ensures a smaller flow rate, and the metal section in the middle has a better heat dissipation effect, which greatly improves the cooling effect. In order to achieve a better effect of preventing 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 between the first cooling jacket 40 and the second cooling jacket 41. The arrangement of the screw plug 42 and the venting screw plug 43 further improves the cooling effect. The automatic exhaust mechanism 44 can automatically exhaust gas. When problems occur in the previous links, it can exhaust high-temperature gas and protect the bearings and motors.

[0043] Working principle: When working, the motor 9 starts, drives the pump shaft 11 to rotate, and then drives the inner core component 12 to rotate, wherein the inner core component 12 is an impeller, which is located in the outer sleeve 3, and its rotation transports the medium to be transported to the place where it is needed to be transported through the water section component 2, wherein the water section component 2 includes an inlet section and an outlet section, wherein the inlet section is connected to the inlet pipe, and the outlet section is connected to the outlet pipe, wherein the pump shaft 11 and the pump head 6 are sealed by a mechanical seal. Since the high-temperature vertical multi-stage centrifugal pump transports high-temperature medium, the setting of the cooling shell 4 not only cools the pump shaft 11 well to prevent heat from being transferred upward through the pump shaft 11, but also the pump shaft 11 cooperates with the setting of the heat insulation plate 5 to well prevent the heat of the medium from being transferred upward to the pump head 6, which plays a good cooling and heat insulation role on the pump shaft 11 and the inside of the pump head 6, and finally plays a good protective role on the motor 9, the coupling 10 and the bearings. Since the pump shaft 11 of the centrifugal pump needs to rotate during operation, a certain gap is bound to be left at the junction between the pump shaft 11 and components such as the insulation board 5. This will inevitably cause the medium vapor generated when the high-temperature medium in the outer sleeve 3 is stirred by the inner core component 12 to partially flow upward through the gap and enter the motor 9, the coupling 10 and the bearing, causing damage to the motor 9, the coupling 10 and the bearing. Therefore, this problem is solved by configuring the pump shaft 11 to consist of an upper pump shaft portion 13, a lower pump shaft portion 14 and a U-shaped portion 15, and fixing a sponge block 17 in the recess of the U-shaped portion 15, wherein the U-shaped portion 15, that is, the portion protruding from the pump shaft 11, effectively blocks the upward movement of the medium vapor by converting the original straight path into a U-shaped detour path. The concave part of the U-shaped part 15 can play a role in fixing the sponge block 17 well. The sponge block 17 can be arranged to absorb the medium vapor. A small amount of the upward medium vapor will be absorbed by the sponge block 17 and stop ascending once it encounters the sponge block 17. This arrangement effectively prevents the medium vapor from ascending through the gap at the junction of the pump shaft 11 and the insulation board 5, and provides good protection for the motor 9, coupling 10, bearings and other components of the vertical multi-stage centrifugal pump.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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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