High pressure hot water pump with cooling structure

Abstract

This invention discloses a high-pressure hot water pump with a cooling structure, comprising a pump body, impeller, pump cover, pump shaft, suspension, mechanical seal, and cooling structure. The suspension, pump cover, and pump body are arranged sequentially from back to front. The pump shaft passes through the suspension and pump cover in sequence and extends into the impeller cavity of the pump body. The pump shaft is fixedly sleeved with the impeller in the impeller cavity. The cooling structure adopts a water-cooled shell, which is hollow inside and fits around the pump cover, sealing it in place. A water-cooled cavity is formed between the interior of the water-cooled shell and the pump cover. The water-cooled shell has an inlet and an outlet that communicate with the water-cooled cavity. The suspension has a suspension cavity inside, and the mechanical seal is located in the suspension cavity and sleeved on the pump shaft. This invention has the advantages of simple structure, good cooling effect, effective reduction of mechanical seal and bearing temperature, extended pump service life, and reduced cost.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, specifically a high-pressure hot water pump with a cooling structure. Background Technology

[0002] Currently, in the field of boiler feedwater, high-pressure hot water pumps are commonly used to transport high-temperature media in the process. Existing high-pressure hot water pumps, such as... Figure 1 As shown, from front to back along the axial direction, the components are the pump body, pump cover, and suspension. The pump body has an impeller cavity. The pump shaft passes through the suspension and pump cover, extending into the impeller cavity. The impeller is located in the impeller cavity and is fixedly sleeved with the pump shaft. An organic seal cavity is opened on the pump cover. The mechanical seal is sleeved on the pump shaft and located in the mechanical seal cavity. A water-cooling cavity is opened on the outer ring of the mechanical seal cavity on the pump cover. The water-cooling cavity is equipped with a cold water inlet and outlet interface. The mechanical seal cavity is equipped with a mechanical seal flushing cooling water interface. The disadvantages of this structure are: First, the mechanical seal cavity is very close to the impeller cavity. Even if a water-cooling cavity is set up and external cooling water is connected for cooling, the water cooling effect is not obvious due to heat conduction. The temperature in the mechanical seal cavity is still high. The mechanical seal cavity also needs to be connected to mechanical seal flushing water for cooling. The overall cooling effect is poor and the cost is high. Second, both the water-cooling cavity and the mechanical seal cavity need to be connected to water pipes, resulting in high installation and maintenance costs. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-pressure hot water pump with a cooling structure that is simple in structure, has good cooling effect, effectively reduces the temperature of mechanical seals and bearings, extends pump service life, and reduces costs.

[0004] The technical solution adopted by this invention to solve its technical problem is: A high-pressure hot water pump with a cooling structure includes a pump body, impeller, pump cover, pump shaft, suspension, mechanical seal, and cooling structure. The suspension, pump cover, and pump body are arranged sequentially from back to front. The pump shaft passes through the suspension and pump cover in sequence and extends into the impeller cavity of the pump body. The pump shaft is fixedly sleeved with the impeller in the impeller cavity. The cooling structure is characterized by: a water-cooled shell, the water-cooled shell being hollow inside and fitted over the pump cover; the water-cooled shell being limited by a limiting member or connected to the pump cover; a water-cooling cavity being formed between the interior of the water-cooled shell and the pump cover; and an inlet and an outlet communicating with the water-cooling cavity being provided on the water-cooled shell. The suspension has a suspension cavity inside, and the mechanical seal is installed in the suspension cavity and sleeved on the pump shaft; By installing a water-cooled shell over the pump cover, a large-area heat exchange with the pump cover can be achieved. The mechanical seal is placed in the suspension cavity, away from the pump body. Combined with the cooling effect of the water-cooled shell, the temperature of the mechanical seal can be effectively reduced, ensuring that the operating temperature of the mechanical seal is within the safe range. There is no need to connect external flushing cooling water to the suspension cavity to flush and cool the mechanical seal, which reduces costs and provides good cooling effect.

[0005] The water-cooled housing of the present invention includes a left-clamping water-cooled housing and a right-clamping water-cooled housing. The left-clamping water-cooled housing is located on the left side of the pump cover with its opening facing the pump cover, and the right-clamping water-cooled housing is located on the right side of the pump cover with its opening facing the pump cover. The left-clamping water-cooled housing and the right-clamping water-cooled housing are connected and detachably fixed. The water-cooled housing is designed as a clamping type, which is convenient for installation, disassembly and processing, and can also ensure a large area of ​​water-cooling cavity and good cooling effect.

[0006] The left-side clamp-on water-cooled housing, the right-side clamp-on water-cooled housing, and the pump cover of the present invention are all provided with sealing elements at their contact points to ensure the sealing effect of the water-cooled housing and prevent cooling water leakage.

[0007] The pump cover of the present invention includes an upper end cover plate, a pump shaft sleeve and a lower end cover plate. The front side of the pump shaft sleeve is fixedly connected to the upper end cover plate and the rear side is fixedly connected to the lower end cover plate. An upper end cover through hole is opened in the middle of the upper end cover plate and a lower end cover through hole is opened in the middle of the lower end cover plate. The upper end cover through hole, the pump shaft sleeve and the lower end cover through hole are coaxially connected. The pump shaft extends out from the suspension cavity, passes through the lower end cover through hole, the pump shaft sleeve and the upper end cover through hole and then extends into the impeller cavity of the pump body. The upper end cover is fixedly connected to the pump body, and the lower end cover is fixedly connected to the suspension. The pump cover has a simple structure and occupies little space. The water-cooled shell is fitted over the pump cover, which can effectively cool the pump cover and reduce heat conduction to ensure that the mechanical seal temperature is low.

[0008] The diameter of the upper cover plate of the present invention is larger than that of the lower cover plate. A plurality of reinforcing ribs are provided between the upper and lower cover plates. The reinforcing ribs are spaced apart along the circumference of the pump cover. The upper end of the reinforcing rib is fixedly connected to the upper cover plate, and the lower end is fixedly connected to the lower cover plate. The upper cover plate has a large diameter, which facilitates the fixed connection with the pump body. The lower cover plate has a small diameter, which facilitates the connection with the suspension. At the same time, it reduces the space occupied by the pump cover, reduces costs, and facilitates installation and assembly. The reinforcing ribs ensure the stability of the pump cover and also limit the radial position of the water-cooled shell.

[0009] The limiting component of the present invention includes a limiting boss. The limiting boss is formed by extending outward from the outer periphery of the front side of the suspension or the outer periphery of the lower end cover plate. The upper end of the water-cooled housing abuts against the upper end cover plate, and the lower end abuts against the limiting boss, so as to limit the axial movement of the water-cooled housing.

[0010] The left-side clamp-on water-cooled housing of the present invention includes a left housing and a left housing bottom sealing plate. The two sides of the left housing extend outward to form left housing connecting lugs. The bottom of the left housing is provided with a left housing bottom sealing plate. The outer side of the left housing bottom sealing plate is fixedly connected to the bottom of the left housing, and the shape of the inner end face matches the outer periphery shape of the lower end cover. The inner end face of the left housing bottom sealing plate is in contact with the outer periphery of the lower end cover. The right-side clamp-on water-cooled housing includes a right housing and a right housing bottom sealing plate. The two sides of the right housing extend outward to form right housing connecting lugs. The bottom of the right housing is provided with a right housing bottom sealing plate. The outer side of the right housing bottom sealing plate is fixedly connected to the bottom of the right housing. The shape of the inner end face matches the outer periphery shape of the lower end cover plate. The inner end face of the right housing bottom sealing plate is in contact with the outer periphery of the lower end cover plate. The left housing connecting lug is connected to the right housing connecting lug and fixed by bolts; The water-cooled shell structure ensures a large water-cooling cavity area, thereby increasing the water-cooling effect.

[0011] The present invention provides a heat insulation ring on the pump shaft with a heat insulation ring sleeved on the rear side of the pump cover. The heat insulation ring is located in the suspension cavity and is located on the front side of the suspension cavity. The heat insulation ring assists in heat insulation, and at the same time, the heat insulation ring can act as a bearing bush and balance the radial force.

[0012] The upper end cover plate of the present invention has a packing cavity and a hub cavity sequentially opened from back to front on the front end surface. The packing cavity is provided with packing and a packing gland. The packing and the packing gland are sleeved on the pump shaft, and the packing gland presses the packing tightly. The impeller hub in the pump body extends out of the pump body and is inserted into the hub cavity, which is fitted with the pump cover with a clearance and axially presses the packing gland; The packing reduces media leakage in the impeller cavity, preventing impact on the lifespan of the heat insulation ring and water cooling effect. The impeller hub is inserted into the hub cavity to ensure impeller stability, and the impeller hub extends out of the pump body and has a clearance fit with the hub cavity. This clearance fit ensures that the impeller will not rub against the pump cover when rotating, further ensuring that stability and service life are not affected. It also tightens the packing gland and limits the axial position of the packing gland. The packing gland is easy to install and disassemble, and it can tighten the packing gland to ensure the sealing of the packing.

[0013] The present invention provides a drive end bearing on the rear side of the suspension cavity on the pump shaft. The inner ring of the drive end bearing is fixedly sleeved on the pump shaft, and the outer ring is fixed to the suspension cavity. The drive end bearing is a bearing with a dust cover. The rear end face of the outer ring of the bearing with the dust cover is provided with spaced shims. The shims are provided with through holes for bolts to pass through. The rear end face of the suspension is provided with threaded holes. The bolts pass through the shims and are threadedly connected to the threaded holes. The drive-end bearing uses a bearing with a dust cover, which has a good dust prevention effect. Compared with the existing technology, the drive-end bearing cover is eliminated, and the limit is achieved by the cooperation of shims and bolts, which can effectively reduce costs. Moreover, the airflow generated by the rotation of the pump shaft can also better assist in cooling the bearing and mechanical seal.

[0014] The beneficial effects of this invention are as follows: by installing a water-cooled shell over the pump cover, a large-area heat exchange with the pump cover can be achieved. By placing the mechanical seal in the suspension cavity, away from the pump body, and combining this with the cooling effect of the water-cooled shell, the temperature of the mechanical seal can be effectively reduced, ensuring that the operating temperature of the mechanical seal is within the safe range. There is no need to connect external flushing cooling water to the suspension cavity to flush and cool the mechanical seal, which reduces costs and provides good cooling effect. The water-cooled shell is designed as a clamp type, which is convenient for installation, disassembly, and processing, and also ensures a large area of ​​the water-cooled cavity, ensuring good cooling effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a centrifugal pump with a cooling structure in the existing technology.

[0016] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 3 This is the main view of the overall structure of the present invention.

[0018] Figure 4 This is a side view of the overall structure of the present invention.

[0019] Figure 5 yes Figure 4 Sectional view of AA.

[0020] Figure 6 This is an exploded view of the overall structure of the present invention.

[0021] Figure 7 This is a schematic diagram of the assembly structure of the pump cover and the clamp-type water-cooled housing of the present invention.

[0022] Figure 8 This is a schematic diagram of another angle of fit between the pump cover and the clamp-type water-cooled housing of the present invention.

[0023] Reference numerals in the attached drawings: Pump body-1, Impeller-2, Packing gland-3, Packing-4, Pump cover-5, Upper end cover-501, Pump shaft sleeve-502, Lower end cover-503, Reinforcing rib-504, Pump shaft-6, Heat insulation ring-7, Suspension-8, Suspension bracket-9, Bearing with dust cover-10, Gasket-11, Bolt-12, Mechanical seal-13, Mechanical seal retainer-14, Left clamp-type water-cooled housing-15, Left housing connecting lug-1501, Left housing bottom sealing plate-1502, Water inlet-1503, Right clamp-type water-cooled housing-16, Right housing connecting plate-1601, Right housing bottom sealing plate-1602, Water outlet-1603, Limiting boss-17, Water-cooled cavity-18, Fan-19. Detailed Implementation

[0024] The present invention will now be described in conjunction with the accompanying drawings and embodiments.

[0025] like Figure 1 As shown, this is a high-pressure hot water pump used in the prior art. Along the axial direction from front to back, there are pump body 1, pump cover 5 and suspension 8. The pump body 1 has an impeller cavity. The pump shaft 6 passes through the suspension 8 and pump cover 5 and extends into the impeller cavity. The impeller 2 is located in the impeller cavity and is fixedly sleeved with the pump shaft 6. The pump cover 5 has an organic seal cavity. The mechanical seal 13 is sleeved on the pump shaft 6 and located in the mechanical seal cavity. The pump cover 5 has a water cooling cavity 18 on the outer ring of the mechanical seal cavity. The water cooling cavity 18 is provided with a cold water inlet and outlet interface. The mechanical seal cavity is provided with a mechanical seal flushing cooling water interface. A drive end bearing is fitted on the pump shaft 6 at the rear side of the suspension cavity. A bearing end cover is provided on the rear side of the drive end bearing. The bearing end cover is fixed to the suspension 8 by bolts. A fan 19 is fitted on the pump shaft 6 at the rear side of the bearing end cover. The fan 19 rotates with the pump shaft 6 to cool the drive end bearing. The suspension 8 is supported by the suspension bracket 9.

[0026] As attached Figure 2-8 As shown, this is the high-pressure hot water pump used in this embodiment. It includes a pump body 1, an impeller 2, a pump cover 5, a pump shaft 6, a suspension 8, a mechanical seal 13, and a cooling structure. The suspension 8, pump cover 5, and pump body 1 are arranged sequentially from back to front. The suspension 8 is supported by a suspension bracket 9. The pump shaft 6 passes through the suspension 8 and the pump cover 5 in sequence and extends into the impeller cavity of the pump body 1. The pump shaft 6 is fixedly sleeved with the impeller 2 in the impeller cavity. The cooling structure adopts a water-cooled shell. The water-cooled shell is hollow inside and fits around the pump cover 5 and is sealed to the pump cover 5. The water-cooled shell is limited by a limiting member or connected to the pump cover. A water-cooled cavity 18 is formed between the inside of the water-cooled shell and the pump cover 5. The water-cooled shell has an inlet 1503 and an outlet 1603 that communicate with the water-cooled cavity 18. The suspension 8 has a suspension cavity inside, and the mechanical seal 13 is located in the suspension cavity and sleeved on the pump shaft 6; A water-cooled shell is installed over the pump cover 5 to achieve large-area heat exchange with the pump cover. The mechanical seal 13 is placed in the suspension cavity, away from the pump body 1. Combined with the cooling effect of the water-cooled shell, the temperature of the mechanical seal 13 can be effectively reduced, ensuring that the operating temperature of the mechanical seal 13 is within the safe range. There is no need to connect external flushing cooling water to the suspension cavity to flush and cool the mechanical seal, which reduces costs and provides good cooling effect.

[0027] In this embodiment, the water-cooled housing is located outside the pump cover and is not limited by the size of the pump cover. The size of the water-cooled cavity can be set according to actual needs, which can ensure the heat exchange effect with the pump cover.

[0028] The water-cooled housing includes a left-clamping water-cooled housing 15 and a right-clamping water-cooled housing 16. The left-clamping water-cooled housing 15 is located on the left side of the pump cover 5 with its opening facing the pump cover 5, and the right-clamping water-cooled housing 16 is located on the right side of the pump cover 5 with its opening facing the pump cover 5. The left-clamping water-cooled housing 15 and the right-clamping water-cooled housing 16 are connected and detachably fixed. The water-cooled housing is designed as a clamping type, which is convenient for installation, disassembly and processing, and can also ensure a large area of ​​water-cooling cavity and good cooling effect.

[0029] The left-side clamp-on water-cooled housing 15 and the right-side clamp-on water-cooled housing 16 are all equipped with sealing elements at their contact points with the pump cover 5 to ensure the sealing effect of the water-cooled housing and prevent cooling water leakage.

[0030] The pump cover 5 includes an upper cover plate 501, a pump shaft sleeve 502, and a lower cover plate 503. The front side of the pump shaft sleeve 502 is fixedly connected to the upper cover plate 501, and the rear side is fixedly connected to the lower cover plate 503. An upper cover through hole is opened in the middle of the upper cover plate 501, and a lower cover through hole is opened in the middle of the lower cover plate 503. The upper cover through hole, the pump shaft sleeve 502, and the lower cover through hole are coaxially connected. The pump shaft 6 extends out from the suspension cavity, passes through the lower cover through hole, the pump shaft sleeve, and the upper cover through hole, and then extends into the impeller cavity of the pump body 1. The upper end cover plate 501 is detachably and fixedly connected to the pump body 1 by bolts, and the lower end cover plate 503 is detachably and fixedly connected to the suspension 8 by bolts. The pump cover 5 has a simple structure and occupies little space. The water-cooled shell is fitted over the pump cover 5, which can effectively cool the pump cover 5 and reduce heat conduction to ensure that the mechanical seal 13 has a low temperature.

[0031] The diameter of the upper cover plate 501 is larger than the diameter of the lower cover plate 503. A plurality of reinforcing ribs 504 are provided between the upper cover plate 501 and the lower cover plate 503. The reinforcing ribs 504 are spaced apart along the circumference of the pump cover 5. The upper end of the reinforcing rib 504 is fixedly connected to the upper cover plate 501, and the lower end is fixedly connected to the lower cover plate 503. The upper cover plate 501 has a large diameter, which facilitates the fixed connection with the pump body 1. The lower cover plate 503 has a small diameter, which facilitates the connection with the suspension 8. At the same time, it reduces the space occupied by the pump cover 5, reduces costs, and facilitates installation and assembly. The reinforcing ribs 504 are provided to ensure the stability of the pump cover 5. The reinforcing ribs 504 can also limit the radial position of the water-cooled shell.

[0032] In this embodiment, since the diameter of the upper cover plate 501 is larger than the diameter of the lower cover plate 503, the reinforcing rib 504 is inclined, and the upper side of the reinforcing rib 504 provides radial restraint to the water-cooled shell.

[0033] The limiting component includes a limiting boss 17, which is formed by extending outward from the outer periphery of the front side of the suspension 8 or the outer periphery of the lower end cover plate 503. Figure 3 , Figure 5 The upper end of the water-cooled housing abuts against the upper cover plate 501, and the lower end abuts against the limiting boss 17, so as to limit the axial movement of the water-cooled housing.

[0034] In this embodiment, the limiting boss 17 is located on the outer periphery of the lower end of the lower cover plate. Alternatively, the limiting boss can be located on the outer periphery of the front side of the suspension as needed.

[0035] The left-side clamp-on water-cooled housing 15 includes a left housing and a left housing bottom sealing plate 1502. The two sides of the left housing extend outward to form left housing connecting ear plates 1501. The bottom of the left housing is provided with a left housing bottom sealing plate 1502. The outer side of the left housing bottom sealing plate 1502 is fixedly connected to the bottom of the left housing, and the shape of the inner end face matches the outer peripheral shape of the lower end cover plate 503. The inner end face of the left housing bottom sealing plate 1502 is in contact with the outer peripheral of the lower end cover plate 503. The right-side clamp-type water-cooled housing 16 includes a right housing and a right housing bottom sealing plate 1602. The two sides of the right housing extend outward to form right housing connecting ear plates 1601. The bottom of the right housing is provided with a right housing bottom sealing plate 1602. The outer side of the right housing bottom sealing plate 1602 is fixedly connected to the bottom of the right housing, and the shape of the inner end face matches the outer peripheral shape of the lower end cover plate 503. The inner end face of the right housing bottom sealing plate 1602 is in contact with the outer peripheral of the lower end cover plate 503. The left housing connecting lug 1501 and the right housing connecting lug 1601 are connected to each other and fixed by bolts; The water-cooled shell structure ensures a large water-cooling cavity area, thereby increasing the water-cooling effect.

[0036] In this embodiment, the left clamp-type water-cooled housing 15 is located on the left side of the pump shaft sleeve, and the shape of the left housing is set as an arc with the opening facing the pump shaft sleeve. The right clamp-type water-cooled housing 16 is located on the right side of the pump shaft sleeve, and the shape of the right housing is set as an arc with the opening facing the pump shaft sleeve.

[0037] In this embodiment, the upper end face of the left clamp-on water-cooled housing 15 abuts against the lower end face of the upper end cover plate 501, and the lower end face abuts against the limiting boss 17 for axial limiting. The upper end face of the right clamp-on water-cooled housing 16 abuts against the lower end face of the upper end cover plate 501, and the lower end face abuts against the limiting boss 17 for axial limiting. In this embodiment, seals are installed at the positions where the left clamp-on water-cooled housing 15 and the right clamp-on water-cooled housing 16 contact the upper end cover plate 501, seals are installed at the positions where they contact the lower end cover plate 503, and seals are installed at the connection points between the left housing connecting ear plate 1501 and the right housing connecting ear plate 1601 for sealing.

[0038] In this embodiment, the water inlet 1503 is located on the left clamp-type water-cooled housing 15, and the water outlet 1603 is located on the right clamp-type water-cooled housing 16.

[0039] In this embodiment, the water-cooled housing is limited in the axial and radial directions by the upper cover plate, the limiting boss, and the reinforcing ribs, which ensures the stability of the water-cooled housing position. Alternatively, the water-cooled housing can be fixed to the pump cover with bolts as needed, which can also achieve the stability of the water-cooled housing position.

[0040] A heat insulation ring 7 is fitted on the pump shaft 6 on the rear side of the pump cover 5. The heat insulation ring 7 is located in the suspension cavity and at the front side of the suspension cavity. The heat insulation ring 7 is provided to assist in heat insulation. At the same time, the heat insulation ring 7 can act as a bearing bush and balance the radial force.

[0041] In this embodiment, the heat insulation ring 7 is fixed to the inner wall of the suspension, resulting in a compact structure.

[0042] In this embodiment, the heat insulation ring 7 adopts the structure of a heat insulation pad.

[0043] In this embodiment, a mechanical seal retainer 14 is fitted on the pump shaft 6 between the heat insulation ring 7 and the mechanical seal 13. One end of the mechanical seal retainer 14 abuts against the heat insulation ring 7, and the other end abuts against the mechanical seal 13, thereby axially limiting the mechanical seal.

[0044] A packing cavity is provided on the front end face of the upper cover plate 501. The packing cavity is provided with packing 4 and packing gland 3. The packing 4 and packing gland 3 are fitted on the pump shaft 6. The packing gland 3 presses the packing 4 tightly. The packing 4 reduces the leakage of the medium in the impeller cavity and prevents it from affecting the life of the heat insulation ring and the water cooling effect.

[0045] In this embodiment, the packing 4 sits in the packing cavity, and the packing gland 3 presses down to compress the packing 4.

[0046] In this embodiment, the front side of the packing cavity on the upper end cover plate 501 is set as a hub cavity. The impeller hub in the pump body 1 extends out of the pump body and is inserted into the hub cavity to ensure the stability of the impeller 2. The impeller hub extends out of the pump body and is clearance-fitted with the hub cavity. The clearance fit ensures that the impeller will not rub against the pump cover when rotating, further ensuring that the stability is not affected and extending the service life.

[0047] In this embodiment, the impeller hub is inserted into the hub cavity and can press the packing gland tightly, limiting the axial position of the packing gland. The packing gland is easy to install and disassemble, and can also press the packing gland tightly to ensure the sealing of the packing.

[0048] A drive end bearing is fitted on the rear side of the suspension cavity on the pump shaft 6. The inner ring of the drive end bearing is fixedly fitted on the pump shaft 6, and the outer ring is fixed to the suspension cavity. The drive end bearing is a bearing 10 with a dust cover. A gasket 11 is provided at intervals on the rear end face of the outer ring of the bearing 10 with a dust cover. A through hole is provided on the gasket 11 for the bolt 12 to pass through. A threaded hole is provided on the rear end face of the suspension 8. The bolt 12 passes through the gasket 11 and is threadedly connected to the threaded hole. The drive end bearing adopts a bearing 10 with a dust cover, which has a good dust protection effect. Compared with the existing technology, the drive end bearing cover is eliminated, and the limit is achieved by the cooperation of the gasket 11 and the bolt 12, which can effectively reduce the cost. Moreover, the airflow generated by the rotation of the pump shaft 6 can also better assist in cooling the bearing and mechanical seal.

[0049] In this embodiment, the bearing with the dust cover is filled with grease to ensure the bearing's lubrication effect.

[0050] In this embodiment, the mechanical seal refers to the existing technology, which includes the dynamic ring, stationary ring, mechanical seal spring, etc., and will not be described in detail here.

[0051] When using this invention: 1. The left clamp-type water-cooled housing 15 and the right clamp-type water-cooled housing 16 are fitted together and sleeved on the outside of the pump shaft sleeve 502. The left housing connecting ear plate 1501 and the right housing connecting ear plate 1601 are fixed with bolts. The upper end face of the left clamp-type water-cooled housing 15 and the right clamp-type water-cooled housing 16 abuts against the upper end cover plate 501, the lower end face abuts against the limiting boss 17, and the inner wall abuts against the upper side of the reinforcing rib 504. The left clamp-type water-cooled housing 15 and the right clamp-type water-cooled housing 16 are both limited in the axial and radial directions to prevent them from shaking or shifting during operation. 2. When the pump shaft 6 drives the impeller 2 to work, the pump body 1 is in a high temperature state and conducts the temperature to the drive end. Cold water is introduced into the water cooling chamber to cool it down. The heat insulation ring also plays an auxiliary role in cooling down the suspension chamber. 3. During the rotation of the pump shaft 6, the airflow cooling at the drive end can also effectively reduce the bearing temperature and mechanical seal temperature during pump operation; 4. Inject mechanical oil into the suspension cavity to ensure the safe operation of the mechanical seal.

Claims

1. A high-pressure hot water pump with a cooling structure, comprising a pump body, an impeller, a pump cover, a pump shaft, a suspension, a mechanical seal, and a cooling structure, wherein the suspension, pump cover, and pump body are arranged sequentially from back to front, the pump shaft passes through the suspension and pump cover sequentially, and extends into the impeller cavity of the pump body, the pump shaft being fixedly sleeved with the impeller in the impeller cavity, characterized in that: The cooling structure adopts a water-cooled shell, which is hollow inside and fitted outside the pump cover. The water-cooled shell is limited by a limiting component or connected to the pump cover. A water-cooled cavity is formed between the inside of the water-cooled shell and the pump cover. The water-cooled shell is provided with an inlet and an outlet that communicate with the water-cooled cavity. The suspension has a suspension cavity inside, and the mechanical seal is installed in the suspension cavity and sleeved on the pump shaft; The pump cover includes an upper cover plate, a pump shaft sleeve, and a lower cover plate. The front side of the pump shaft sleeve is fixedly connected to the upper cover plate, and the rear side is fixedly connected to the lower cover plate. An upper cover through hole is opened in the middle of the upper cover plate, and a lower cover through hole is opened in the middle of the lower cover plate. The upper cover through hole, the pump shaft sleeve, and the lower cover through hole are coaxially connected. After the pump shaft extends out of the suspension cavity, it passes through the lower cover through hole, the pump shaft sleeve, and the upper cover through hole and then extends into the impeller cavity of the pump body. The upper end cover is fixedly connected to the pump body, and the lower end cover is fixedly connected to the suspension. The limiting component includes a limiting boss. The limiting boss is formed by extending outward from the outer periphery of the front side or the outer periphery of the lower end cover plate of the suspension. The upper end of the water-cooled shell abuts against the upper end cover plate, and the lower end abuts against the limiting boss. The water-cooled housing includes a left-clamping water-cooled housing and a right-clamping water-cooled housing. The left-clamping water-cooled housing is located on the left side of the pump cover and its opening faces the pump cover. The right-clamping water-cooled housing is located on the right side of the pump cover and its opening faces the pump cover. The left-clamping water-cooled housing and the right-clamping water-cooled housing are connected to each other and can be detachably fixed. The left-side clamp-on water-cooled housing includes a left housing and a left housing bottom sealing plate. The two sides of the left housing extend outward to form left housing connecting lugs. The bottom of the left housing is provided with a left housing bottom sealing plate. The outer side of the left housing bottom sealing plate is fixedly connected to the bottom of the left housing. The shape of the inner end face matches the outer periphery shape of the lower end cover. The inner end face of the left housing bottom sealing plate fits against the outer periphery of the lower end cover. The bottom of the left housing bottom sealing plate abuts against the limiting protrusion. The right-side clamp-type water-cooled housing includes a right housing and a right housing bottom sealing plate. The two sides of the right housing extend outward to form right housing connecting lugs. The bottom of the right housing is provided with a right housing bottom sealing plate. The outer side of the right housing bottom sealing plate is fixedly connected to the bottom of the right housing. The shape of the inner end face matches the outer periphery shape of the lower end cover. The inner end face of the right housing bottom sealing plate fits against the outer periphery of the lower end cover. The bottom of the right housing bottom sealing plate abuts against the limiting protrusion. The left shell connecting lug is connected to the right shell connecting lug and fixed with bolts.

2. A high-pressure hot water pump with a cooling structure according to claim 1, characterized in that: The left and right clamp-type water-cooled housings are all equipped with seals at the contact points with the pump cover.

3. A high-pressure hot water pump with a cooling structure according to claim 1 or 2, characterized in that: The diameter of the upper cover plate is larger than that of the lower cover plate. Several reinforcing ribs are provided between the upper and lower cover plates. The reinforcing ribs are spaced apart along the circumference of the pump cover. The upper end of the reinforcing rib is fixedly connected to the upper cover plate, and the lower end is fixedly connected to the lower cover plate.

4. A high-pressure hot water pump with a cooling structure according to claim 1 or 2, characterized in that: A heat insulation ring is fitted on the pump shaft at the rear side of the pump cover. The heat insulation ring is located in the suspension cavity and at the front side of the suspension cavity.

5. A high-pressure hot water pump with a cooling structure according to claim 1 or 2, characterized in that: The upper end cover plate has a packing cavity and a hub cavity that are connected from back to front on the front end surface. The packing cavity is provided with packing and a packing gland. The packing and the packing gland are sleeved on the pump shaft, and the packing gland presses the packing tightly. The impeller hub in the pump body extends out of the pump body and is inserted into the hub cavity, where it is fitted with the pump cover with a clearance and axially presses against the packing gland.

6. A high-pressure hot water pump with a cooling structure according to claim 1 or 2, characterized in that: A drive-end bearing is fitted on the rear side of the suspension cavity on the pump shaft. The inner ring of the drive-end bearing is fixedly fitted on the pump shaft, and the outer ring is fixed to the suspension cavity. The drive-end bearing is a bearing with a dust cover. A gasket is provided at intervals on the rear end face of the outer ring of the bearing with the dust cover. A through hole is opened on the gasket for the bolt to pass through. A threaded hole is opened on the rear end face of the suspension. The bolt passes through the gasket and is threadedly connected to the threaded hole.

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