Cooling mechanism for high-temperature type vertical multi-stage pump

Abstract

The invention relates to the field of pumps, in particular to a cooling mechanism for a high-temperature vertical multistage pump, which comprises a cooling shell, a heat insulation plate is fixed at the upper end of the cooling shell, a pump head is fixed at the upper end of the heat insulation plate, and a pump shaft penetrates through the center positions of the pump head and the heat insulation plate. 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 rotation of the U-shaped part is formed in the heat insulation plate, a sponge block is fixed to the concave position of the U-shaped part, a first cooling sleeve is arranged at the position close to the lower end of the upper pump shaft part, and a second cooling sleeve is arranged at the position close to the upper end of the lower pump shaft part. The first cooling sleeve and the second cooling sleeve are both arranged in the heat insulation plate, the cooling effect on the pump shaft is greatly improved, medium steam in the pump cavity is well prevented from ascending through gaps at the junctions between the pump shaft and the first cooling sleeve, the second cooling sleeve, the heat insulation plate and the like, and then a bearing and a motor are well protected.

Description

Technical Field

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

[0002] High-temperature vertical multistage pumps need to work in high-temperature environments. They can be used to transport high-temperature media in high-temperature environments, such as high-temperature liquid media in the petroleum, petrochemical, chemical and other industries. Since high-temperature vertical multistage pumps work in high-temperature environments and 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, which cools the bearing body inside the bearing mechanism through air-cooling cooling mechanisms installed at the upper and lower ends of the bearing mechanism. The upper and lower groups 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 caused by 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; 2) The steam 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] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a cooling mechanism for a high-temperature vertical multi-stage 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 bearings and the motor.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cooling mechanism for a high-temperature vertical multi-stage pump, comprising a cooling shell, a heat insulation board is fixed to the upper end of the cooling shell, a pump head is fixed to the upper end of the heat insulation board, a pump shaft passes through the center position of the pump head and the heat insulation board, 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 U-shaped portion to rotate is opened in the heat insulation board, a sponge block is fixed to the recess of the U-shaped portion, a first cooling jacket is provided near the lower end of the upper pump shaft portion, a second cooling jacket is provided near the upper end of the lower pump shaft portion, and the first cooling jacket and the second cooling jacket are both arranged in the heat insulation board.

[0007] 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.

[0008] Preferably, a side of the second sponge portion away from the first sponge portion is in contact with an outer wall of the cavity.

[0009] 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.

[0010] Preferably, one spring is provided between adjacent arc-shaped plates, and the end of the spring is connected to the center position of the arc-shaped plate.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] Preferably, a screw plug and a venting screw plug are provided on the barrel-shaped housing, and an automatic exhaust mechanism is provided on the pump head.

[0016] (III) Beneficial effects

[0017] 1. The present invention not only cools the pump shaft well through the arrangement of the cooling shell, and prevents heat from being transferred upward through the pump shaft, but also the arrangement of the pump shaft, the heat insulation plate, the first cooling sleeve and the second cooling sleeve well prevents the heat of the medium from being transferred upward into the pump head, and plays a good cooling and heat-insulating role for the pump shaft and the interior of the pump head, and finally plays a good protective role for the bearings and the motor; 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 fixing a sponge block in the recess of the U-shaped portion, the problem of the medium vapor ascending along the gap at the junction between the pump shaft and the first cooling sleeve, the second cooling sleeve, the heat insulation plate, etc. is well solved, wherein the U-shaped portion, that is, the portion protruding from the pump shaft, effectively blocks the upward movement of the medium vapor by changing the original straight path into a U-shaped circuitous path, wherein the recess of the U-shaped portion The recess can play a good role in fixing the sponge block. The setting of the sponge block can play a role in absorbing medium vapor. A small amount of upward medium vapor will be absorbed by the sponge block and stop ascending once it encounters the sponge block. This setting effectively prevents medium vapor from ascending through the gap at the junction of the pump shaft and the first cooling jacket, the second cooling jacket, and the insulation board, and provides good protection for the bearings, motors and other components of the vertical multi-stage pump. Among them, the setting of the first cooling jacket and the second cooling jacket, on the one hand, further enhances the cooling and heat insulation effect, and on the other hand, the cooling jacket is set in the form of an upper and lower two-stage structure of the first cooling jacket and the second cooling jacket. Compared with the whole-stage structure, the two-stage structure greatly reduces the cost of parts processing. 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 enhances the cooling effect.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 5. 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

[0022] Figure 1 It is an overall schematic diagram of the present invention.

[0023] Figure 2 It is an overall schematic diagram of the pump shaft of the present invention.

[0024] Figure 3 It is an overall schematic diagram of the present invention.

[0025] Figure 4 It is a schematic diagram of the pump shaft and sponge block of the present invention.

[0026] Figure 5 It is a schematic diagram of the sponge block, arc plate and spring of the present invention.

[0027] Figure 6 For the present invention Figure 1 Schematic diagram after adding the extrusion block, connecting channel and guide plate.

[0028] Figure 7 It is a cross-sectional schematic diagram of the cavity and the extrusion block of the present invention.

[0029] Figure 8 It is an overall schematic diagram of the cooling shell of the present invention.

[0030] Fig. 9 It is an overall schematic diagram of the heat insulation board of the present invention.

[0031] In the figure: 1-cooling shell, 2-insulation board, 3-pump head, 4-pump shaft, 5-upper pump shaft, 6-lower pump shaft, 7-U-shaped part, 8-cavity, 9-sponge block, 10-first cooling jacket, 11-second cooling jacket, 12-outer bottom surface, 13-gap, 14-first sponge part, 15-second sponge part, 16-first cylindrical block, 17-second cylindrical block, 18-arc plate, 19-spring, 20-extrusion block, 21-cooling cavity, 22-barrel shell, 23-top shell, 24-embedded groove, 25-embedded part, 26-insulation main body, 27-inverted cone cavity, 28-connecting channel, 29-guide plate, 30-screw plug, 31-air venting screw plug, 32-automatic exhaust mechanism. DETAILED DESCRIPTION

[0032] The following will be combined with the attached embodiment of the present invention Figure 1-9 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 cooling mechanism for a high-temperature vertical multistage pump, comprising a cooling shell 1, a heat insulation board 2 is fixed to the upper end of the cooling shell 1, a pump head 3 is fixed to the upper end of the heat insulation board 2, a pump shaft 4 is penetrated at the center of the pump head 3 and the heat insulation board 2, the pump shaft 4 comprises an upper pump shaft portion 5, a lower pump shaft portion 6 and a U-shaped portion 7 connecting the upper pump shaft portion 5 and the lower pump shaft portion 6, a cavity 8 for the U-shaped portion 7 to rotate is opened in the heat insulation board 2, a sponge block 9 is fixed to the concave portion of the U-shaped portion 7, a first cooling sleeve 10 is provided near the lower end of the upper pump shaft portion 5, and a cooling sleeve 20 is provided near the upper end of the lower pump shaft portion 6. The second cooling jacket 11, the first cooling jacket 10 and the second cooling jacket 11 are all arranged in the insulation board 2, wherein the upper end of the upper pump shaft portion 5 is connected to the motor, and the lower pump shaft portion 6 is connected to the impeller structure. The arrangement of the cooling shell 1 not only cools the pump shaft 4 very well to prevent heat from being transferred upward through the pump shaft 4, but also the pump shaft 4 cooperates with the arrangement of the insulation board 2, the first cooling jacket 10 and the second cooling jacket 11 to well prevent the heat of the medium from being transferred upward to the pump head 3, which has a good cooling and heat insulating effect on the pump shaft 4 and the interior of the pump head 3, and finally has a good protective effect on the bearings and the motor. Since the pump shaft 3 needs to rotate during operation, there will inevitably be a certain gap at the junction of the pump shaft 3 and the first cooling jacket 10, the second cooling jacket 11, and the insulation board 2. This will inevitably cause the medium vapor generated when the high-temperature medium in the pump chamber is stirred by the impeller structure to partially flow upward through the gap and enter the bearings and the motor, causing damage to the bearings and the motor. Therefore, this problem is solved by configuring the pump shaft 4 to consist of an upper pump shaft portion 5, a lower pump shaft portion 6, and a U-shaped portion 7, and fixing a sponge block 9 in the recess of the U-shaped portion 7, wherein the U-shaped portion 7, that is, the portion protruding from the pump shaft 4, 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 7 can play a role in fixing the sponge block 9 well. The sponge block 9 can be set to absorb the medium vapor. A small amount of the upward medium vapor will be absorbed by the sponge block 9 and stop ascending once it encounters the sponge block 9. This setting effectively prevents the medium vapor from ascending through the gap at the junction of the pump shaft 3 and the first cooling sleeve 10, the second cooling sleeve 11, and the insulation board 2, and provides good protection for the bearings, motors and other components of the vertical multi-stage pump. The setting of the first cooling sleeve 6 and the second cooling sleeve 7 further improves the cooling and heat insulation effect on the one hand, and sets the cooling sleeve in the form of a two-stage structure of the first cooling sleeve 6 and the second cooling sleeve 7. 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. 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 medium vapor from ascending, a plurality of groups of U-shaped portions 7 and sponge blocks 9 may be provided from top to bottom on the pump shaft 3 between the first cooling jacket 10 and the second cooling jacket 11 .

[0034] The U-shaped portion 7 is arranged to be horizontal, and a gap 13 is left between its outer bottom surface 12 and the outer wall of the cavity 8. The sponge block 9 includes a first sponge portion 14 fixed in the U-shaped groove of the U-shaped portion 7, the first sponge portion 14 is fixed with a second sponge portion 15, the top surface of the second sponge portion 15 is fixed with a first cylindrical block 16, the first cylindrical block 16 is provided with a first through hole through which the upper pump shaft portion 5 passes, the bottom surface of the second sponge portion 15 is fixed with a second cylindrical block 17, the second cylindrical block 17 is provided with a second through hole through which the lower pump shaft portion 6 passes, wherein the first sponge portion 14 plays a good fixing role with the U-shaped portion 7, and then plays a good fixing role for the sponge block 9 as a whole, wherein the first cylindrical block 16 wraps and fixes the upper pump shaft portion 5, and the second cylindrical block 17 wraps and fixes the lower pump shaft portion 6, which not only has a good blocking and adsorption effect on the medium vapor ascending along the pump shaft, but also plays a good limiting role for the second sponge portion 15. During the rotation of the pump shaft 3, the pump shaft 3 drives the sponge block 9 to rotate together. Even if part of the medium vapor escapes into the gap 13, the rotation of the sponge block 9 can adsorb the medium vapor in the gap 13. Therefore, the U-shaped portion 7 arranged laterally and the sponge block 9 of this structure well prevent the medium vapor from passing through the gap and ascending to the bearing or the motor.

[0035] The side of the second sponge portion 15 away from the first sponge portion 14 is in contact with the outer wall of the cavity 8, wherein the cavity 8 is cylindrical, and the outer wall of the second sponge portion 15 is tangent to the inner wall of the cavity 8, so that the contact area between the second sponge portion 15 and the inner wall of the cavity 8 is the smallest, and the resistance to rotation is also the smallest, and the impact on the rotation of the pump shaft 3 is the smallest. At the same time, the second sponge portion 15 can cover the entire cavity 8 during rotation, and the coverage area is wide.

[0036] A plurality of arc plates 18 are evenly arranged in the first sponge part 14 and the second sponge part 15, and the arc plates 18 protrude to the left. Springs 19 are connected between adjacent arc plates 18, wherein the arrangement of the arc plates 18 plays a good supporting role for the first sponge part 14 and the second sponge part 15, which is equivalent to the role of a skeleton, and the springs 19 play a connecting role. In this way, when the pump shaft 3 drives the first sponge part 14 and the second sponge part 15 to rotate, due to the centrifugal force and the springs 19, the arc plates 18 will deviate from their original positions, and the deviation distance and orientation of each arc plate 18 are not fixed, so that the first sponge part 14 and the second sponge part 15 are pulled or compressed to a certain extent, and the pulling process can enhance the effect of the first sponge part 14 and the second sponge part 15 on adsorbing medium vapor, and the compression process can play the role of squeezing the medium gathered in the first sponge part 14 and the second sponge part 15, and squeeze out the liquid medium gathered in the first sponge part 14 and the second sponge part 15, thereby facilitating the subsequent more effective adsorption of medium vapor.

[0037] A spring 19 is provided between adjacent arc plates 18, and the end of the spring 19 is connected to the center position of the arc plate 18, wherein the arc plate 18 can be set to be hollow, and the material can be plastic, which can reduce the weight of the arc plate 18 and ensure the balance of the first sponge part 14 and the second sponge part 15. The spring 19 is connected to the center position of the arc plate 18, which can enhance the overall squeezing effect of the first sponge part 14 and the second sponge part 15 while using a small number of springs 19.

[0038] An extrusion block 20 is fixed to the outer wall of the cavity 8. The shape of the extrusion block 20 is an arc shape convex inwardly. When the second sponge part 15 rotates to the extrusion block 20, it will be fully squeezed, so that the medium vapor accumulated in the sponge block 9 can be fully squeezed, so that the sponge block 9 will not be in a saturated state and can always maintain the ability to absorb medium vapor. The shape of the extrusion block 20 is set to an arc shape convex inwardly, so that there is a gradual process when squeezing the sponge block 9. Since the arc plates 18 and springs 19 are evenly distributed in the sponge block 9, the sponge block 9 can be squeezed more comprehensively and evenly. A certain space is left between the bottom surface of the second sponge part 15 and the inner bottom surface of the cavity 8, and the space is used to receive the medium liquid squeezed out of the sponge block 9.

[0039] A cooling chamber 21 is provided in the cooling shell 1. The cooling shell 1 includes a barrel-shaped shell 22. A top shell 23 is fixed on the top of the barrel-shaped shell 22. An embedding groove 24 is provided at the center of the top shell 23. The height of the top shell 23 gradually decreases from the outside to the inside. The cooling chamber 21 is cooled by a cooling medium such as air or cold water. The cooling chamber 21 can be connected to an external cooling medium circulation device. For example, the cooling chamber 21 can be connected to a cooling liquid tank through a circulation pipe. The coolant in the cooling liquid tank enters the cooling chamber 21 through the circulation pipe to cool the cooling shell 1 and then returns to the cooling liquid tank. In this way, the cooling shell 1 is cooled in a reciprocating cycle. This cooling method belongs to the prior art and will not be described here. The cooling chamber 21 is provided in both the barrel-shaped shell 22 and the top shell 23 and is connected to each other. The cooling shell 1 of this structure forms a wrap-around cooling, which greatly improves the cooling range and cooling effect. The height of the top shell 23 decreases gradually from the outside to the inside. This configuration makes the top shell 23 conical. This can enhance the support strength of the heat insulation board 2 and improve stability on the one hand, and can quickly guide the water droplets condensed on the lower surface of the top shell 23 due to the cooling of the top shell 23 from the outside to the middle on the other hand, so that the water droplets on the lower surface of the top shell 23 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 3 includes an embedding portion 25 matching the embedding groove 24, and a heat insulation main body 26 is fixed to the upper end of the embedding portion 25. The height of the bottom surface of the heat insulation main body 26 gradually decreases from the outside to the inside. An inverted cone cavity 27 is formed between the heat insulation main body 26 and the top shell 23. The inverted cone cavity 27 is connected to the cavity 8 through a connecting channel 28. The setting of the embedding groove 24 and the embedding portion 25 greatly facilitates the connection and fixation of the heat insulation board 3 and the cooling shell 1 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 24 and the embedding portion 25 are sealed by an O-ring. The embedding portion 25 is clamped between the cooling shell 1 and the second cooling sleeve 11, which greatly improves the cooling and heat insulation effect at the junction with the pump shaft 3. The inverted cone cavity 27 is used to temporarily store the squeezed medium, wherein the medium liquid squeezed out of the sponge block 9 enters the inverted cone cavity 27 through the connecting channel 28 and is collected. The medium liquid stored in the inverted cone cavity 27 has a better heat insulation effect than the empty inverted cone cavity 27, because if the medium is liquid such as water or oil, its specific heat capacity is larger than that of air. Therefore, using the inverted cone cavity 27 to store the medium liquid squeezed out of the sponge block 9 not only makes reasonable use of the inverted cone cavity 27, but also enhances the heat insulation effect. In order to avoid the situation where the inverted cone cavity 27 is filled with medium and cannot accommodate the medium squeezed out from the sponge block 9 later, a channel connecting the inverted cone cavity 27 and the outside can be set in the insulation main body 26, and a fixed pipe can be passed through the channel, one end of the pipe extends into the inverted cone cavity 27, and the other end extends out of the insulation main body 26, wherein a detachable end cover is provided on the end of the pipe exposed to the outside, so that the medium liquid in the inverted cone cavity 27 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 28 is arranged at the junction of the outer wall and the bottom wall of the cavity 8. A guide plate 29 is fixed on the bottom wall of the cavity 8, wherein a certain gap is left between the inner end of the guide plate 29 and the inner end of the U-shaped portion 7, so as not to affect the rotation of the U-shaped portion 7. Through the arrangement of the guide plate 29, a good guiding effect is played on the medium liquid of the squeezed sponge block 9, and the medium liquid is guided to the position of the connecting channel 28, so as to facilitate the medium liquid to flow into the inverted cone cavity 27.

[0042] The barrel-shaped housing 22 is provided with a screw plug 30 and a venting screw plug 31, and the pump head 3 is provided with an automatic exhaust mechanism 32, wherein the arrangement of the screw plug 30 and the venting screw plug 31 further improves the cooling effect. The automatic exhaust mechanism 32 can automatically exhaust gas, and when there is a problem in the previous link, it can exhaust high-temperature gas and protect the bearings and the motor.

[0043] Working principle: During operation, the cooling shell 1 is used to cool the pump shaft 4 well to prevent heat from being transferred upward through the pump shaft 4. At the same time, the pump shaft 4 cooperates with the insulation plate 2, the first cooling sleeve 10 and the second cooling sleeve 11 to well prevent the heat of the medium from being transferred upward to the pump head 3, thereby playing a good cooling and heat-insulating role for the pump shaft 4 and the interior of the pump head 3, and ultimately playing a good protective role for the bearings and the motor. Since the pump shaft 3 needs to rotate during operation, there will inevitably be a certain gap at the junction of the pump shaft 3 and the first cooling jacket 10, the second cooling jacket 11, and the insulation board 2. This will inevitably cause the medium vapor generated when the high-temperature medium in the pump chamber is stirred by the impeller structure to partially flow upward through the gap and enter the bearings and the motor, causing damage to the bearings and the motor. Therefore, this problem is solved by configuring the pump shaft 4 to consist of an upper pump shaft portion 5, a lower pump shaft portion 6, and a U-shaped portion 7, and fixing a sponge block 9 in the recess of the U-shaped portion 7, wherein the U-shaped portion 7, that is, the portion protruding from the pump shaft 4, 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 7 can play a good role in fixing the sponge block 9. The sponge block 9 can be set to absorb the medium vapor. A small part of the upward medium vapor will be absorbed by the sponge block 9 and stop ascending when it encounters the sponge block 9. This setting well prevents the medium vapor from ascending through the gap at the junction of the pump shaft 3 and the first cooling jacket 10, the second cooling jacket 11, and the insulation board 2, and well protects the bearings, motors and other components of the vertical multistage pump. The setting of the first cooling jacket 6 and the second cooling jacket 7 further improves the cooling and heat insulation effect on the one hand, and sets the cooling jacket into a two-stage structure of the first cooling jacket 6 and the second cooling jacket 7. 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 make the effect of preventing the medium vapor from ascending better, a combination of several groups of U-shaped parts 7 and sponge blocks 9 can be set from top to bottom on the pump shaft 3 between the first cooling jacket 10 and the second cooling jacket 11.

[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 cooling mechanism for a high-temperature vertical multistage pump, characterized in that: The invention comprises a cooling shell (1), a heat insulation board (2) is fixed to the upper end of the cooling shell (1), a pump head (3) is fixed to the upper end of the heat insulation board (2), a pump shaft (4) passes through the center of the pump head (3) and the heat insulation board (2), the pump shaft (4) comprises an upper pump shaft portion (5), a lower pump shaft portion (6) and a U-shaped portion (7) connecting the upper pump shaft portion (5) and the lower pump shaft portion (6), a cavity (8) is provided in the heat insulation board (2) for the U-shaped portion (7) to rotate, a sponge block (9) is fixed to the recess of the U-shaped portion (7), a first cooling jacket (10) is provided near the lower end of the upper pump shaft portion (5), and a second cooling jacket (11) is provided near the upper end of the lower pump shaft portion (6), and the first cooling jacket (10) and the second cooling jacket (11) are both arranged in the heat insulation board (2).

2. A cooling mechanism for a high temperature vertical multistage pump according to claim 1, characterized in that: The U-shaped portion (7) is arranged to be horizontal, and a gap (13) is left between its outer bottom surface (12) and the outer wall of the cavity (8); the sponge block (9) comprises a first sponge portion (14) fixed in the U-shaped groove of the U-shaped portion (7); the first sponge portion (14) is fixed with a second sponge portion (15); a first cylindrical block (16) is fixed on the top surface of the second sponge portion (15); a first through hole is formed on the first cylindrical block (16) through which the upper pump shaft portion (5) passes; a second cylindrical block (17) is fixed on the bottom surface of the second sponge portion (15); a second through hole is formed on the second cylindrical block (17) through which the lower pump shaft portion (6) passes.

3. A cooling mechanism for a high temperature vertical multistage pump according to claim 2, characterized in that: A side of the second sponge portion (15) away from the first sponge portion (14) is in contact with an outer wall of the cavity (8).

4. A cooling mechanism for a high temperature vertical multistage pump according to claim 2, characterized in that: A plurality of arc-shaped plates (18) are evenly arranged in the first sponge part (14) and the second sponge part (15); the arc-shaped plates (18) protrude to the left, and springs (19) are connected between adjacent arc-shaped plates (18).

5. A cooling mechanism for a high temperature vertical multistage pump according to claim 4, characterized in that: One spring (19) is provided between adjacent arc-shaped plates (18), and an end of the spring (19) is connected to the center position of the arc-shaped plate (18).

6. A cooling mechanism for a high temperature vertical multistage pump according to claim 4, characterized in that: An extrusion block (20) is fixed on the outer wall of the cavity (8), and the shape of the extrusion block (20) is an inwardly convex arc shape.

7. A cooling mechanism for a high temperature vertical multistage pump according to claim 1, characterized in that: A cooling cavity (21) is provided in the cooling shell (1), and the cooling shell (1) comprises a barrel-shaped shell (22), a top shell (23) is fixed on the top of the barrel-shaped shell (22), an embedding groove (24) is provided at the center of the top shell (23), and the height of the top shell (23) gradually decreases from the outside to the inside.

8. A cooling mechanism for a high temperature vertical multistage pump according to claim 7, characterized in that: The heat insulation board (3) comprises an embedding portion (25) matching the embedding groove (24); a heat insulation main body (26) is fixed to the upper end of the embedding portion (25); the height of the bottom surface of the heat insulation main body (26) gradually decreases from the outside to the inside; an inverted cone-shaped cavity (27) is formed between the heat insulation main body (26) and the top shell (23); and the inverted cone-shaped cavity (27) is connected to the cavity (8) through a connecting channel (28).

9. A cooling mechanism for a high temperature vertical multistage pump according to claim 8, characterized in that: The communication channel (28) is arranged at the junction of the outer wall and the bottom wall of the cavity (8), and a guide plate (29) is fixed on the bottom wall of the cavity (8).

10. A cooling mechanism for a high temperature vertical multistage pump according to claim 7, characterized in that: The barrel-shaped housing (22) is provided with a screw plug (30) and a venting screw plug (31), and the pump head (3) is provided with an automatic exhaust mechanism (32).

Images