A vertical centrifugal pump with mechanical seal convenient for quick replacement

Abstract

The application provides a vertical centrifugal pump with a mechanical seal convenient to replace quickly, and belongs to the technical field of centrifugal pumps, which comprises a pump body, an internal support, an impeller, a connecting mechanism, a pressing mechanism and a long shaft motor; compared with a segmented shaft structure, a segmented shell arrangement is adopted, an integrated long shaft body is driven by the long shaft motor, and the lower end of the long shaft is connected to the impeller for transmission; four circumferentially distributed mounting blocks are arranged on the connecting shell of the connecting mechanism, and a turbulence mechanism, a spray washing mechanism, a drain pipe and a pressure relief valve assembly are assembled on the mounting blocks respectively, the turbulence mechanism and the spray washing mechanism are tangentially connected to a cleaning cavity to form a cyclone; the mechanical seal is clamped between the pressing mechanism and a supporting ring seat, and a throttling labyrinth gap is arranged between the supporting ring seat and the long shaft body. The mechanical seal can be taken out by splitting the shell, and there is no need to center and align the shafting; the mechanical seal can be purged, cleaned and intensively cooled, the pressure relief valve balances the cavity pressure, reduces medium channeling, is convenient to maintain, and has high operation reliability.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, and in particular to a vertical centrifugal pump that facilitates quick replacement of the mechanical seal. Background Technology

[0002] Vertical centrifugal pumps are widely used in fluid transportation. As a core component of vertical centrifugal pumps, the mechanical seal is susceptible to damage from long-term erosion by the medium and impurities, requiring periodic disassembly and replacement. Most existing vertical centrifugal pumps use a segmented, docking shaft structure. After replacing the mechanical seal and disassembling the motor, the two drive shafts need to be re-aligned, making assembly cumbersome, maintenance time-consuming, and requiring a high level of skill from maintenance personnel.

[0003] Furthermore, after the mechanical seal is disassembled and reassembled, dust, debris, and impurities can easily fall into the sealing cavity. These impurities remaining on the mechanical seal end face will accelerate the wear of the seal and reduce its service life. Conventional pumps rely solely on the self-flushing of the pumped medium. When conveying media containing impurities, these impurities can easily come into contact with the sealing end face, resulting in limited cooling and cleaning effectiveness. At the same time, existing pumps with flushing structures lack a pressure balancing structure, making the flushing cavity prone to overpressure and bidirectional media flow, which affects the reliability of equipment operation. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a vertical centrifugal pump with a mechanical seal that allows for quick replacement, thus resolving the problems existing in the prior art.

[0005] The present invention provides a vertical centrifugal pump that facilitates quick replacement of mechanical seals, including a pump body, an internal support fixedly connected to the inner wall of the pump body, a mounting seat provided in the middle of the internal support, an impeller rotatably mounted on the upper end of the mounting seat, and a connection interface provided on the connecting end face of the impeller. A connecting mechanism is mounted on the top of the pump body. The connecting mechanism includes a cylindrical connecting housing. Four mounting blocks are fixedly connected to the side wall of the connecting housing and are evenly distributed in a circular ring. The four mounting blocks are arranged circumferentially at ° intervals. Through holes are opened on the mounting blocks and are tangentially connected to the inside of the connecting housing. The four mounting blocks are respectively equipped with a turbulence mechanism, a spraying mechanism, a drain pipe, and a pressure relief valve assembly. A pressing mechanism is provided above the connecting mechanism. The pressing mechanism includes a pressing ring plate. A long-shaft motor is fixedly installed on the upper end of the pressing ring plate. A sealing ring seat is fixedly connected to the lower end of the pressing ring plate. The sealing ring seat presses down and abuts against the sealing rubber ring at the upper end of the supporting ring plate. A pressing ring seat is also fixedly provided at the lower end of the sealing ring seat. The mechanical seal is clamped between the pressing ring seat and the supporting ring seat; the long shaft body passes through the entire pressing mechanism and the inner ring of the mechanical seal in sequence. The upper end of the long shaft body is connected to the output end of the long shaft motor, and a docking block is set at the lower end of the long shaft body. The docking block and the interface of the impeller connection end face are engaged with each other.

[0006] As a further embodiment of the present invention: a partition plate is fixedly provided inside the connecting housing near the lower end, and a supporting annular seat is embedded and fixed in the middle of the partition plate; a supporting annular plate is fixedly installed inside the connecting housing near the upper end, and a sealing ring is provided on the upper surface of the supporting annular plate.

[0007] As a further embodiment of the present invention: the partition plate, the supporting annular plate, and the inner wall of the connecting shell together form a closed cleaning chamber, and the turbulence mechanism and the spraying mechanism input the medium into the cleaning chamber tangentially through the corresponding through holes.

[0008] As a further embodiment of the present invention: a first connecting flange is provided at the upper end of the connecting housing, and a second connecting flange is provided at the lower end of the connecting housing; the first connecting flange is detachably and securely connected to the pressing annular plate by a first connecting bolt; the second connecting flange is detachably and securely assembled to the upper end of the pump body by a second connecting bolt.

[0009] As a further aspect of the present invention: a throttling labyrinth gap is formed between the inner hole of the supporting annular seat and the main body of the long shaft, allowing a small amount of cleaning and cooling medium in the cleaning chamber to flow to the mechanical seal area, while restricting a large amount of bidirectional flow of the medium.

[0010] As a further aspect of the present invention: a mounting bearing is embedded in the upper end face of the mounting base, the outer ring of the mounting bearing is fixedly connected to the mounting base, and the inner ring of the mounting bearing is coaxially fixedly connected to a mounting shaft.

[0011] As a further aspect of the present invention: the turbulence mechanism includes a mechanism connecting plate, which has a plurality of mechanism through holes; a mechanism rubber ring is provided on one side end face of the mechanism connecting plate facing the mounting block; an air outlet nozzle is embedded in the mechanism connecting plate, the air outlet nozzle is connected to a one-way valve, and the one-way valve is connected to an external air source interface.

[0012] As a further aspect of the present invention: the spraying mechanism includes a second mechanism connecting plate, a second mechanism rubber ring is provided on one end face of the second mechanism connecting plate facing the mounting block, and a plurality of second mechanism through holes are provided on the second mechanism connecting plate; a water outlet nozzle is embedded in the second mechanism connecting plate, the water outlet nozzle is connected to an on / off valve, and the on / off valve is connected to an external water source interface.

[0013] As a further aspect of the present invention: the turbulence mechanism is sealed and fixed by a mounting bolt passing through the mechanism through hole one and the threaded interface; the spraying mechanism is sealed and assembled by a mounting bolt passing through the mechanism through hole two and the threaded interface.

[0014] The beneficial effects of this invention are: 1. Compared with the traditional segmented shaft structure, this invention adopts a segmented housing combined with an integrated long shaft body. The housing is connected by a pressing mechanism to form a detachable segmented housing structure. The long shaft body is directly driven by a long shaft motor, and the lower end of the long shaft is connected to the impeller through a mating block. During maintenance, only the housing structure needs to be disassembled and the pressing mechanism and the long shaft body can be lifted off as a whole. There is no need to disassemble the drive shaft. While realizing the direct drive of the impeller by the long shaft, the assembly space of the mechanical seal can be quickly released, eliminating the shaft alignment process after disassembly and assembly, simplifying the mechanical seal disassembly and assembly process, and shortening maintenance time.

[0015] 2. The present invention is equipped with a tangentially connected turbulence mechanism and a spraying mechanism, which can tangentially introduce gas and cleaning water into the cleaning chamber after the seal is replaced, forming a swirling flow in the chamber to blow away and wash away dust and debris on the surface of the mechanical seal; when the equipment is running normally, a cooling medium can be introduced to enhance the heat exchange effect in conjunction with the gas turbulence, improve the working environment of the mechanical seal, and extend the service life of the seal.

[0016] 3. The present invention provides a throttling labyrinth gap between the supporting ring seat and the main body of the long shaft, which allows a small amount of medium to flow for cooling and purging while suppressing bidirectional medium flow. It is equipped with an independent drain pipe and a pressure relief valve assembly. The large flow cross-section of the drain pipe is not easy to block, and the pressure relief valve assembly maintains the pressure of the cleaning chamber, avoiding overpressure in the chamber that could cause sealing failure and medium flow, thus improving the overall reliability of the machine. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of a vertical centrifugal pump that facilitates quick replacement of mechanical seals according to the present invention; Figure 2 A schematic diagram of the internal structure of a vertical centrifugal pump that facilitates quick replacement of mechanical seals according to the present invention; Figure 3 A schematic diagram of the internal structure of a vertical centrifugal pump that facilitates quick replacement of mechanical seals according to the present invention; Figure 4 This is a three-dimensional structural diagram illustrating the connection relationship between the connecting mechanism, the turbulence-disrupting mechanism, and the spraying mechanism of a vertical centrifugal pump that facilitates quick replacement of mechanical seals according to the present invention. Figure 1 ; Figure 5 This is a three-dimensional structural diagram illustrating the connection relationship between the connecting mechanism, the turbulence-disrupting mechanism, and the spraying mechanism of a vertical centrifugal pump that facilitates quick replacement of mechanical seals according to the present invention. Figure 2 ; Figure 6 A three-dimensional sectional view of the connection mechanism of a vertical centrifugal pump for easy and quick replacement of mechanical seals according to the present invention. Figure 1 ; Figure 7 A three-dimensional sectional view of the connection mechanism of a vertical centrifugal pump for easy and quick replacement of mechanical seals according to the present invention. Figure 2 ; Figure 8 A three-dimensional structural schematic diagram of a turbulence mechanism for a vertical centrifugal pump that facilitates quick replacement of mechanical seals according to the present invention. Figure 9 This is a three-dimensional structural diagram of the spraying mechanism of a vertical centrifugal pump that facilitates quick replacement of mechanical seals according to the present invention.

[0018] List of reference numerals in the attached diagram: 1. Pump body; 2. Internal support; 3. Mounting base; 4. Mounting bearing; 5. Mounting shaft; 6. Impeller; 7. Connecting mechanism; 71. Connecting housing; 72. Connecting flange one; 73. Connecting flange two; 74. Partition plate; 75. Supporting annular seat; 76. Supporting annular plate; 77. Sealing ring; 78. Mounting block; 79. Through hole; 710. Threaded interface; 8. Turbulence mechanism; 81. Mechanism connecting plate one; 82. Mechanism rubber ring one; 83. Mechanism through hole one; 84. Air outlet nozzle; 8 5. One-way valve; 86. Air source interface; 9. Spraying mechanism; 91. Mechanism connecting plate two; 92. Mechanism rubber ring two; 93. Mechanism through hole two; 94. Water nozzle; 95. On / off valve; 96. Water source interface; 10. Mounting bolt one; 11. Mounting bolt two; 12. Long shaft motor; 13. Pressing mechanism; 131. Pressing ring plate; 132. Sealing ring seat; 133. Pressing ring seat; 14. Long shaft body; 15. Connecting bolt one; 16. Connecting bolt two; 17. Mechanical seal. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0020] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Reference Figures 1 to 9 This embodiment provides a vertical centrifugal pump that facilitates quick replacement of mechanical seals, including a pump body 1. An internal support 2 is fixedly connected to the inner wall of the pump body 1. A mounting seat 3 is provided in the middle of the internal support 2. A mounting bearing 4 is embedded in the upper end face of the mounting seat 3. The outer ring of the mounting bearing 4 is fixedly connected to the mounting seat 3. A mounting shaft 5 is coaxially fixedly connected to the inner ring of the mounting bearing 4. An impeller 6 is coaxially fixedly assembled on the upper end of the mounting shaft 5. A mating interface is opened on the connecting end face of the impeller 6.

[0023] A connecting mechanism 7 is mounted on top of the pump body 1. The connecting mechanism 7 includes a cylindrical connecting housing 71. A connecting flange 72 is provided at the upper end of the connecting housing 71, and a connecting flange 73 is provided at the lower end of the connecting housing 71. Four mounting blocks 78 are fixedly connected to the side wall of the connecting housing 71 and are evenly distributed in a circular ring. The four mounting blocks 78 are arranged circumferentially at 90° intervals. Through holes 79 are provided on the mounting blocks 78. The through holes 79 are tangentially connected to the interior of the connecting housing 71. The connection method of the through holes 79 is similar to the structure of the tangential feed port of a cyclone separator. The medium enters the interior of the connecting housing 71 tangentially through the through holes 79, which can form a swirling effect inside the cavity.

[0024] A partition plate 74 is fixedly installed inside the connecting housing 71 near its lower end. An annular sealing gasket is fitted between the outer edge of the partition plate 74 and the inner wall of the connecting housing 71 to achieve static sealing on the outside of the partition plate, preventing leakage of the cleaning chamber medium from the gap between the partition plate and the housing. A supporting annular seat 75 is embedded and fixed in the middle of the partition plate 74. A throttling labyrinth gap is machined between the inner hole of the supporting annular seat 75 and the long shaft body 14, allowing a small amount of cleaning and cooling medium in the cleaning chamber to flow to the mechanical seal 17 area to purge and cool the sealing end face, while restricting a large amount of bidirectional flow of the medium to prevent the medium inside the pump chamber from flowing back into the cleaning chamber. A supporting annular plate 76 is fixedly installed inside the connecting housing 71 near its upper end. A sealing rubber ring 77 is provided on the upper surface of the supporting annular plate 76. The partition plate 74, the supporting annular plate 76, and the inner wall of the connecting housing 71 together form a sealed cleaning chamber.

[0025] Four mounting blocks 78 are respectively fitted with the flow-dispersing mechanism 8, the spraying mechanism 9, the drain pipe 18, and the pressure relief valve assembly 19; one mounting block 78 is fitted with the flow-dispersing mechanism 8, one mounting block 78 is fitted with the spraying mechanism 9, and the remaining two mounting blocks 78 are fitted with the drain pipe 18 and the pressure relief valve assembly 19, respectively. The flow-dispersing mechanism 8 and the spraying mechanism 9 input the medium tangentially into the cleaning chamber through the corresponding through holes 79.

[0026] The turbulence-disrupting mechanism 8 includes a mechanism connecting plate 81, which has several mechanism through holes 83. A mechanism rubber ring 82 is provided on the end face of the mechanism connecting plate 81 facing the mounting block 78. An air outlet nozzle 84 is embedded in the mechanism connecting plate 81, and the air outlet nozzle 84 is connected to a one-way valve 85. The one-way valve 85 is connected to an external air source interface 86. The turbulence-disrupting mechanism 8 is sealed and fixed to the mounting block 78 by a mounting bolt 10 passing through the mechanism through holes 83 and connecting to a threaded interface 710.

[0027] The spraying mechanism 9 includes a connecting plate 2 91. A rubber ring 2 92 is provided on the end face of the connecting plate 2 91 facing the mounting block 78. Several through holes 2 93 are provided on the connecting plate 2 91. A water nozzle 94 is embedded in the connecting plate 2 91. The water nozzle 94 is connected to a shut-off valve 95. The shut-off valve 95 is connected to a water source interface 96. The spraying mechanism 9 completes the sealed assembly with the mounting block 78 by connecting a threaded interface 710 through the through holes 2 93 via mounting bolts 2 11, which is used to introduce cleaning water or cooling medium into the cleaning chamber.

[0028] A shut-off valve is installed on the drain pipe 18. The flow cross-section of the drain pipe 18 is larger than the flow cross-section of the water outlet nozzle 94 of the spray mechanism 9, reducing the risk of impurity blockage. It is used to discharge wastewater carrying dust and debris during cleaning. The pressure relief valve assembly 19 is threadedly sealed on the remaining mounting block 78 and is directly connected to the cleaning chamber. When the pressure in the cleaning chamber exceeds a preset threshold, the pressure relief valve assembly 19 automatically opens to release the excess pressure in the chamber, maintain the pressure balance inside the cleaning chamber, prevent the turbulence mechanism 8 from continuously spraying air and causing overpressure in the chamber, and avoid high-pressure gas from entering the pump body medium chamber or causing the upper sealing ring 77 to fail. The opening pressure of the pressure relief valve assembly 19 is set slightly higher than the internal working pressure of the pump body 1, which can both achieve overpressure relief and prevent external media from flowing back into the pump chamber.

[0029] Both the drain pipe 18 and the pressure relief valve assembly 19 are detachably mounted on the corresponding mounting block 78 by means of a mechanism connecting plate similar to the turbulence mechanism 8 and the spraying mechanism 9.

[0030] A pressing mechanism 13 is provided above the connecting mechanism 7. The pressing mechanism 13 includes a pressing annular plate 131. A long-shaft motor 12 is fixedly installed on the upper end of the pressing annular plate 131. A sealing annular seat 132 is fixedly connected to the lower end of the pressing annular plate 131. The sealing annular seat 132 presses down and abuts against the sealing ring 77 on the upper end of the supporting annular plate 76 to achieve sealing of the upper end of the cleaning chamber. A pressing annular seat 133 is also fixedly provided at the lower end of the sealing annular seat 132.

[0031] The mechanical seal 17 is clamped between the pressing ring seat 133 and the supporting ring seat 75. The long shaft body 14 passes through the entire pressing mechanism 13 and the inner ring of the mechanical seal 17 in sequence. The upper end of the long shaft body 14 is connected to the output end of the long shaft motor 12, and a docking block is set at the lower end of the long shaft body 14. The docking block and the interface of the impeller 6 are mutually engaged and matched. The impeller 6 is directly driven to rotate by the long shaft motor 12. This device adopts a single long shaft body 14 to directly drive the impeller 6, abandoning the traditional split docking shaft structure, and eliminating the need to re-align the shaft system after disassembly and maintenance.

[0032] The connecting flange 72 is detachably and securely connected to the pressing ring plate 131 by connecting bolt 15; the connecting flange 73 is detachably and securely assembled to the upper end of the pump body 1 by connecting bolt 16.

[0033] The working process of this invention is as follows: After the mechanical seal 17 is replaced, dust and impurities easily adhere to its surface. At this time, the turbulence mechanism 8 is activated, and compressed gas is injected tangentially into the cleaning chamber through the air source interface 86, one-way valve 85, and outlet nozzle 84, via the through hole 79. The gas forms a swirling flow around the chamber, disturbing and lifting the dust and impurities adhering to the surface of the mechanical seal 17. Subsequently, the spray washing mechanism 9 is activated, and cleaning water is injected tangentially into the cleaning chamber through the water source interface 96, on / off valve 95, and outlet nozzle 94, forming a circulating flow within the chamber to flush and clean the surface of the mechanical seal 17. Simultaneously, the on / off valve of the drain pipe 18 is opened, and wastewater carrying impurities is discharged outwards through the drain pipe 18. The tangential air intake and tangential water intake work together to enhance the fluid turbulence within the chamber, improving the cleaning and impurity removal effect.

[0034] Under normal operating conditions of the centrifugal pump, close the on / off valve of the drain pipe 18; selectively open the turbulence mechanism 8 and the spraying mechanism 9. The spraying mechanism 9 introduces cooling medium into the cleaning chamber to cool the mechanical seal 17, while the turbulence mechanism 8 introduces gas to further agitate the medium in the chamber, enhancing medium flow and heat exchange, improving the cooling efficiency of the mechanical seal 17, reducing the operating temperature of the mechanical seal, and extending the service life of the seal. During operation, the pressure relief valve assembly 19 monitors the internal pressure of the cleaning chamber in real time. When the internal pressure exceeds the set opening pressure, it automatically releases pressure to ensure that the internal pressure of the chamber remains within a safe range.

[0035] When replacing or maintaining the mechanical seal, disconnect the connecting bolts 15 one by one to lift the pressing mechanism 13, along with the long shaft motor 12 and the long shaft body 14, upwards. This releases the pressure constraint of the pressing ring seat 133 on the mechanical seal 17, allowing the mechanical seal 17 to be directly removed for replacement. After assembling the new mechanical seal 17, reinstall the pressing mechanism 13 and tighten the connecting bolts 15 to complete the seal assembly. The transmission relies on the engagement between the lower end of the long shaft body 14 and the impeller 6, eliminating the need for complex shaft alignment during reassembly and shortening maintenance time. The pump body 1 and the connecting mechanism 7 are connected by connecting bolts 16, making the overall disassembly and assembly process simple and convenient.

[0036] It should be noted that not all steps and modules in the above processes and system structure diagrams are mandatory; some steps or modules can be omitted as needed. The execution order of each step is not fixed and can be adjusted as required. The system structure described in the above embodiments can be a physical structure or a logical structure. That is, some modules may be implemented by the same physical entity, or some modules may be implemented by multiple physical entities, or they may be jointly implemented by certain components in multiple independent devices.

[0037] In the above embodiments, the hardware modules can be implemented mechanically or electrically. The present invention has been described and illustrated in detail above with reference to the accompanying drawings and preferred embodiments. However, the present invention is not limited to these disclosed embodiments. Based on the above embodiments, those skilled in the art will understand that more embodiments of the present invention can be obtained by combining the means in the different embodiments described above, and these embodiments are also within the protection scope of the present invention.

Claims

1. A vertical centrifugal pump with a mechanical seal that allows for quick replacement, characterized in that, The pump body (1) is fixedly connected to the inner wall of the pump body (1), and an internal support (2) is provided in the middle of the internal support (2). An impeller (6) is rotatably provided on the upper end of the mounting base (3), and a connection interface is provided on the connecting end face of the impeller (6). A connecting mechanism (7) is mounted on the top of the pump body (1). The connecting mechanism (7) includes a cylindrical connecting housing (71). Four mounting blocks (78) are fixedly connected to the side wall of the connecting housing (71) and are evenly distributed in a circular ring. The four mounting blocks (78) are arranged circumferentially at 90° intervals. Through holes (79) are opened on the mounting blocks (78). The through holes (79) are tangentially connected to the inside of the connecting housing (71). The four mounting blocks (78) are respectively equipped with a turbulence mechanism (8), a spraying mechanism (9), a drain pipe (18), and a pressure relief valve assembly (19). A pressing mechanism (13) is provided above the connecting mechanism (7). The pressing mechanism (13) includes a pressing ring plate (131). A long-shaft motor (12) is fixedly installed on the upper end of the pressing ring plate (131). A sealing ring seat (132) is fixedly connected to the lower end of the pressing ring plate (131). The sealing ring seat (132) is pressed down and abuts against the sealing ring (77) at the upper end of the supporting ring plate (76). A pressing ring seat (133) is also fixedly provided at the lower end of the sealing ring seat (132). The mechanical seal (17) is clamped between the pressing ring seat (133) and the supporting ring seat (75); the long shaft body (14) passes through the entire pressing mechanism (13) and the inner ring of the mechanical seal (17) in sequence. The upper end of the long shaft body (14) is connected to the output end of the long shaft motor (12). The lower end of the long shaft body (14) is provided with a docking block. The docking block and the interface of the impeller (6) are engaged with each other.

2. The vertical centrifugal pump with easy and quick replacement of mechanical seal according to claim 1, characterized in that, A partition plate (74) is fixedly installed inside the connecting housing (71) near the lower end, and a supporting ring seat (75) is embedded and fixed in the middle of the partition plate (74); a supporting ring plate (76) is fixedly installed inside the connecting housing (71) near the upper end, and a sealing ring (77) is provided on the upper surface of the supporting ring plate (76).

3. The vertical centrifugal pump with a mechanical seal that is easy to replace quickly according to claim 2, characterized in that, The partition plate (74), the supporting ring plate (76), and the inner wall of the connecting shell (71) together form a closed cleaning chamber. The turbulence mechanism (8) and the spraying mechanism (9) input the medium tangentially into the cleaning chamber through the corresponding through hole (79).

4. The vertical centrifugal pump with easy and quick replacement of mechanical seal according to claim 1, characterized in that, A connecting flange 1 (72) is provided at the upper end of the connecting housing (71), and a connecting flange 2 (73) is provided at the lower end of the connecting housing (71); the connecting flange 1 (72) is detachably and securely connected to the pressing annular plate (131) by connecting bolt 1 (15); the connecting flange 2 (73) is detachably and securely assembled to the upper end of the pump body (1) by connecting bolt 2 (16).

5. The vertical centrifugal pump with easy and quick replacement of the mechanical seal according to claim 1, characterized in that, A throttling labyrinth gap is formed between the inner hole of the supporting ring seat (75) and the long shaft body (14), allowing a small amount of cleaning and cooling medium in the cleaning chamber to flow to the mechanical seal (17) area, while restricting a large amount of bidirectional flow of the medium.

6. The vertical centrifugal pump with a mechanical seal that is easy to replace quickly according to claim 1, characterized in that, The mounting base (3) has a mounting bearing (4) embedded on its upper end face. The outer ring of the mounting bearing (4) is fixedly connected to the mounting base (3), and the inner ring of the mounting bearing (4) is coaxially fixedly connected to the mounting shaft (5).

7. The vertical centrifugal pump with easy and quick replacement of the mechanical seal according to claim 1, characterized in that, The turbulence mechanism (8) includes a mechanism connecting plate (81), which has several mechanism through holes (83); a mechanism rubber ring (82) is provided on one side of the mechanism connecting plate (81) facing the mounting block (78); an air outlet nozzle (84) is embedded on the mechanism connecting plate (81); the air outlet nozzle (84) is connected to a one-way valve (85); and the one-way valve (85) is connected to an external air source interface (86).

8. The vertical centrifugal pump with easy and quick replacement of the mechanical seal according to claim 1, characterized in that, The spraying mechanism (9) includes a second mechanism connecting plate (91), a second mechanism rubber ring (92) is provided on the end face of the second mechanism connecting plate (91) facing the mounting block (78), and several second mechanism through holes (93) are provided on the second mechanism connecting plate (91); a water outlet nozzle (94) is embedded on the second mechanism connecting plate (91), the water outlet nozzle (94) is connected to the on / off valve (95), and the on / off valve (95) is connected to an external water source interface (96).

9. The vertical centrifugal pump with a mechanical seal that is easy to replace quickly according to claim 7, characterized in that, The turbulence mechanism (8) is sealed and fixed by the installation bolt (10) passing through the mechanism through hole (83) and the threaded interface (710); the spraying mechanism (9) is sealed and assembled by the installation bolt (11) passing through the mechanism through hole (93) and the threaded interface (710).

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