A vertical cylindrical multistage pump

Abstract

The present invention discloses a vertical cylindrical multi-stage pump, including a pump housing, the bottom of the pump housing is connected to a water inlet chamber cover, a rotating shaft is vertically installed at the inner middle end of the pump housing, the bottom of the rotating shaft is rotatably connected to the water inlet chamber cover, the outer part of the rotating shaft is connected to a plurality of impellers in the axial direction, the upper part of the impeller is connected to a guide vane, and the bottom of the end of the guide vane away from the impeller is connected to an interstage plate. By connecting a balance pipe at one end of the sealing chamber, the water in the water pressure chamber enters the interior of the sealing chamber from the balance pipe, and the mechanical sealing ring inside the sealing chamber is cooled, so that it is not easy to be damaged by overheating during operation, and an efficient sealing effect is maintained. The mounting holes with different diameters form step mounting holes, and each stage of the guide vane and the interstage plate corresponds to a different step mounting hole, which ensures the uniqueness during installation, avoids installation errors, and improves the work efficiency and accuracy during installation.

Description

Technical Field

[0001] The invention relates to a multistage pump, in particular to a vertical cylindrical multistage pump, belonging to the field of water pump application. Background Art

[0002] Vertical cylindrical multistage pump is one of many types of water pumps, which are often used in production and life. It can be used vertically to meet different needs.

[0003] The Chinese patent with application number 201610539653.6 discloses a new type of vertical multistage pump, including a pump body shell, a pump shaft installed in the pump body shell, multiple impellers installed on the pump shaft, and a semi-contained mechanical seal installed on the pump shaft at the top of the impeller, and its structure is: including a mechanical seal sleeve, a slot is provided on the mechanical seal sleeve, and a dynamic ring is embedded in the slot; the mechanical seal sleeve is sleeved with a static ring seat on the outer circumference of the dynamic ring, and a groove is opened at the bottom, and a static ring is embedded in the groove in a tight fit, and the friction surface of the static ring and the dynamic ring is in close contact; the outer circumference of the static ring seat is provided with two steps, namely a large step and a small step, and the large step is connected to the mechanical seal cover through multiple small springs. The multistage pump in this patent has low sealing performance during use and cannot cool the mechanical components in the seal.

[0004] The existing multi-stage pumps still have certain deficiencies in use. The existing multi-stage pumps have poor sealing and unloading performance in use, and the leaked water cannot be recovered. The water is directly discharged to the outside after leakage, affecting the upper motor and the external environment, and is prone to damage. Long-term leakage can easily cause damage to the pump body. In addition, the sealed equipment cannot be cooled during use, and the sealing performance is often reduced and the sealing effect is poor. At the same time, the water inlet efficiency is not high, which affects the ability to pump water. Summary of the invention

[0005] The purpose of the present invention is to provide a vertical cylindrical multistage pump, which can solve the problems of poor sealing and unloading performance of existing multistage pumps during use, inability to recycle leaked water, and direct discharge of leaked water to the outside, which affects the upper motor and the external environment and is prone to damage. Long-term leakage can easily cause damage to the pump body. In addition, the sealed device cannot be cooled during use, which often results in reduced sealing performance and poor sealing effect. At the same time, the water inlet efficiency of the water inlet is not high, which affects the ability to pump water, as well as the technical problems of easy errors in the installation of the impeller, guide vane and interstage plate.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A vertical cylindrical multi-stage pump comprises a pump casing, the bottom of which is connected to a water inlet chamber cover, a rotating shaft is vertically installed at the inner middle end of the pump casing, the bottom of the rotating shaft is rotatably connected to the water inlet chamber cover, a plurality of impellers are connected to the outside of the rotating shaft along the axial direction, the upper part of the impeller is connected to a guide vane, and the bottom of the guide vane away from the impeller is connected to an interstage plate.

[0008] A sealing cavity is provided at the middle end of the top of the pump housing, a unloading cavity is provided at the lower part of the sealing cavity, and a plurality of mounting holes are provided inside the pump housing from top to bottom, and the diameters of the plurality of mounting holes increase sequentially from top to bottom, and a plurality of impellers are sequentially installed inside the mounting holes, and the sealing cavity, the mounting holes and the unloading cavity are all through-arranged.

[0009] A water outlet and a water inlet are provided at both upper and lower ends of one side of the pump housing, and the water inlet is connected to the pump inlet water suction chamber at the bottom of the pump housing; a unloading pipe is connected to one side of the pump housing, the upper part of the unloading pipe is connected to the sealed cavity, and the bottom is connected to one side of the pump inlet water suction chamber; a balancing pipe is connected to the other side of the pump housing, the upper part of the balancing pipe is connected to the sealed cavity, and the bottom is connected to the water pressure chamber, and the water pressure chamber is connected to the pump inlet water suction chamber.

[0010] Preferably, a mechanical sealing ring is installed inside the sealing cavity, a sealing unloading plate is connected between the sealing cavity and the unloading cavity, and the rotating shaft passes through the mechanical sealing ring and the sealing unloading plate.

[0011] Preferably, the top of the pump housing is bolted to a vertical support frame, a vertical direct-coupled motor is installed on the top of the vertical support frame, and the output shaft of the vertical direct-coupled motor is fixedly connected to the rotating shaft.

[0012] Preferably, a sliding bearing is installed inside the bottom end of the water inlet chamber cover through a bearing cavity, the bottom of the rotating shaft is rotatably connected to the water inlet chamber cover through the sliding bearing, and an "○"-shaped sealing gasket is installed outside the rotating shaft at the connection with the water inlet chamber cover.

[0013] Preferably, an annular water absorption chamber is provided on the upper portion of the water inlet chamber cover, and the annular water absorption chamber is through-connected with the water inlet.

[0014] Preferably, the sealing cavity, the unloading cavity and the mounting hole are all arranged in a cylindrical shape, and the sealing cavity, the unloading cavity and the mounting hole are all arranged concentrically.

[0015] Preferably, the steps of using the vertical cylindrical multistage pump include:

[0016] Step 1: The vertical direct-connected motor drives the rotating shaft to rotate, and then drives several impellers, guide vanes and interstage plates outside the rotating shaft to rotate. Water enters the pump port water suction chamber from the water inlet. The water inside the pump port water suction chamber flows upward with the rotation of the rotating shaft and enters the interior of each installation hole in turn.

[0017] Step 2: As the water flows upward, part of it enters the top unloading chamber, and the other part is discharged from the water outlet; the water inside the unloading chamber leaks to the temporal part of the sealing chamber, and the water flows back from the unloading pipe to the inside of the pump port suction chamber. The water in the water pressure chamber enters the sealing chamber from the balance pipe to flush the mechanical sealing ring inside the sealing chamber.

[0018] Beneficial effects of the present invention:

[0019] 1. By connecting the water inlet chamber cover to the bottom of the pump housing, the water inlet chamber cover can position and tighten the guide vanes, interstage plates, and impellers in the axial direction during operation to prevent string movement and improve stability. Water enters the pump port suction chamber from the water inlet. The setting of the annular suction chamber improves the water absorption capacity and the efficiency of water entering the pump port suction chamber. The water inside the pump port suction chamber flows upward with the rotation of the shaft and enters the interior of each mounting hole in turn. The unloading chamber can reduce the water pressure inside the pump housing, making the pump housing less likely to be damaged during use. When the water inside the unloading chamber leaks into the sealing chamber, the water flows back from the unloading pipe to the inside of the pump port suction chamber, reducing the water pressure. At the same time, the water will not leak out, protecting the pump housing from damage.

[0020] 2. By connecting a balance pipe at one end of the sealing chamber, the water in the pressure chamber enters the sealing chamber from the balance pipe, cooling the mechanical seal ring inside the sealing chamber, making it less likely to be damaged by overheating during operation and maintaining an efficient sealing effect. The mounting holes with different diameters form step mounting holes, and each level of guide vanes and interstage plates correspond to different step mounting holes, which ensures the uniqueness of the installation, avoids installation errors, and improves the work efficiency and accuracy during installation. The vertical pump uses the upper vertical support frame to form a waist support and can be installed vertically. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

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

[0023] Figure 2 It is a schematic diagram of the internal structure of the pump housing of the present invention.

[0024] Figure 3 It is a schematic diagram of the pump housing structure of the present invention.

[0025] In the figure: 1. water inlet chamber cover; 2. pump housing; 3. unloading pipe; 4. impeller; 5. guide vane; 6. interstage plate; 7. sealing unloading plate; 8. vertical support frame; 9. vertical direct-connected motor; 10. mechanical sealing ring; 11. sliding bearing; 12. balance pipe; 13. unloading chamber; 14. sealing chamber; 15. rotating shaft; 16. sealing gasket; 17. annular water absorption chamber; 18. water outlet; 19. water inlet; 20. mounting hole; 21. pressure chamber. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0027] See also Figure 1-3 As shown, a vertical cylindrical multistage pump comprises a pump housing 2, a water inlet chamber cover 1 is connected to the bottom of the pump housing 2, a rotating shaft 15 is vertically installed at the middle end of the inner part of the pump housing 2, the bottom of the rotating shaft 15 is rotatably connected to the water inlet chamber cover 1, a plurality of impellers 4 are connected to the outer part of the rotating shaft 15 in the axial direction, a guide vane 5 is connected to the upper part of the impeller 4, and an interstage plate 6 is connected to the bottom of one end of the guide vane 5 away from the impeller 4;

[0028] A sealing cavity 14 is provided at the middle end of the top of the pump housing 2, and a relief cavity 13 is provided at the lower part of the sealing cavity 14. A plurality of mounting holes 20 are provided inside the pump housing 2 from top to bottom, and the diameters of the plurality of mounting holes 20 increase sequentially from top to bottom. A plurality of impellers 4 are sequentially installed inside the mounting holes 20, and the sealing cavity 14, the mounting holes 20 and the relief cavity 13 are all through-arranged.

[0029] A water outlet 18 and a water inlet 19 are provided at both upper and lower ends of one side of the pump housing 2, and the water inlet 19 is connected to the pump port water suction chamber at the bottom of the pump housing 2, one side of the pump housing 2 is connected to the unloading pipe 3, the upper part of the unloading pipe 3 is connected to the sealed cavity 14, and the bottom is connected to one side of the pump port water suction chamber, and the other side of the pump housing 2 is connected to the balance pipe 12, the upper part of the balance pipe 12 is connected to the sealed cavity 14, and the bottom is connected to the water pressure chamber, and the bottom is connected to the water pressure chamber 21, and the water pressure chamber 21 is connected to the pump port water suction chamber.

[0030] As a technical optimization solution of the present invention, a mechanical sealing ring 10 is installed inside the sealing chamber 14, a sealing unloading plate 7 is connected between the sealing chamber 14 and the unloading chamber 13, and the rotating shaft 15 passes through the mechanical sealing ring 10 and the sealing unloading plate 7. The mechanical sealing ring 10 and the sealing unloading plate 7 can double-seal the upper part of the unloading chamber to prevent water leakage from the upper part.

[0031] As a technical optimization solution of the present invention, the top bolt of the pump housing 2 is connected with a vertical support frame 8, and a vertical direct-coupled motor 9 is installed on the top of the vertical support frame 8. The output shaft of the vertical direct-coupled motor 9 is fixedly connected to the rotating shaft 15, and the vertical direct-coupled motor 9 can drive the rotating shaft 15 to rotate during operation.

[0032] As a technical optimization scheme of the present invention, a sliding bearing 11 is installed inside the bottom end of the water inlet chamber cover 1 through a bearing cavity, the bottom of the rotating shaft 15 is rotatably connected to the water inlet chamber cover 1 through the sliding bearing 11, and an "○"-shaped sealing gasket 16 is installed on the outside of the rotating shaft 15 at the connection with the water inlet chamber cover 1. The bearing 11 facilitates the rotation of the rotating shaft 15 on the upper part of the water inlet chamber cover 1, and the sealing gasket 16 prevents water from easily entering the inside of the bearing 11, thereby playing a sealing role.

[0033] As a technical optimization solution of the present invention, an annular water absorption chamber 17 is arranged on the upper part of the water inlet chamber cover 1, and the annular water absorption chamber 17 is connected with the water inlet 19. The setting of the annular water absorption chamber 17 improves the water absorption capacity and can improve the efficiency of water entering the pump port water absorption chamber.

[0034] As a technical optimization solution of the present invention, the sealing cavity 14 , the unloading cavity 13 and the mounting hole 20 are all cylindrically arranged, and the sealing cavity 14 , the unloading cavity 13 and the mounting hole 20 are all concentrically arranged, which facilitates the installation of the rotating shaft 15 .

[0035] As a technical optimization solution of the present invention, the steps used by the vertical cylindrical multistage pump include:

[0036] Step 1: The vertical direct-connected motor 9 drives the rotating shaft 15 to rotate, and then drives the impellers 4, the guide vanes 5 and the interstage plate 6 outside the rotating shaft 15 to rotate, and the water enters the inside of the pump port water suction chamber from the water inlet 19. The water inside the pump port water suction chamber flows upward with the rotation of the rotating shaft 15 and enters the inside of each mounting hole 20 in turn;

[0037] Step 2: As the water flows upward, part of it enters the top unloading chamber 13, and the other part is discharged from the water outlet 18; the water inside the unloading chamber 13 leaks into the sealing chamber 14, and the water flows back from the unloading pipe 3 to the inside of the pump port water suction chamber, and the water in the water pressure chamber enters the sealing chamber 14 from the balance pipe 12 to flush the mechanical sealing ring 10 inside the sealing chamber 14.

[0038] When the present invention is in use, the vertical direct-connected motor 9 drives the rotating shaft 15 to rotate, and then drives the impellers 4, the guide vanes 5 and the interstage plate 6 outside the rotating shaft 15 to rotate, so that water enters the pump port water suction chamber from the water inlet 19. The setting of the annular water suction chamber 17 improves the water absorption capacity and the efficiency of water entering the pump port water suction chamber. The water inside the pump port water suction chamber flows upward with the rotation of the rotating shaft 15, and enters the inside of each mounting hole 20 in turn. In the process of water flowing upward, part of it enters the inside of the top unloading chamber 13, and the other part is discharged from the water outlet 18. The unloading chamber 13 can reduce the water pressure inside the pump housing 2, so that the pump housing 2 is not easily damaged during use. When the water inside the unloading chamber 13 is full and the pressure is too high, it leaks into the inside of the sealing chamber 14, and the water flows back from the unloading pipe 3 to the inside of the pump port water suction chamber, reducing the water pressure, and the water will not leak out. The water in the water pressure chamber enters the sealing chamber 14 from the balance pipe 12 to cool the mechanical sealing ring 10 inside the sealing chamber 14, making it less likely to be damaged by overheating during operation and maintaining an efficient sealing effect. Finally, the water inside the sealing chamber 14 flows back from the unloading pipe 3 to the inside of the water inlet 19.

[0039] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A vertical cylindrical multistage pump, characterized in that: The pump comprises a pump housing (2), the bottom of the pump housing (2) being connected to a water inlet chamber cover (1), a rotating shaft (15) being vertically mounted at the middle end of the pump housing (2), the bottom of the rotating shaft (15) being rotatably connected to the water inlet chamber cover (1), the outside of the rotating shaft (15) being connected to a plurality of impellers (4) in an axial direction, the upper part of the impeller (4) being connected to a guide vane (5), and the bottom of one end of the guide vane (5) away from the impeller (4) being connected to an interstage plate (6); A sealing cavity (14) is provided at the middle end of the top of the pump housing (2), a relief cavity (13) is provided at the bottom of the sealing cavity (14), a plurality of mounting holes (20) are provided inside the pump housing (2) from top to bottom, and the diameters of the plurality of mounting holes (20) increase sequentially from top to bottom, a plurality of impellers (4) are sequentially installed inside the mounting holes (20), and the sealing cavity (14), the mounting holes (20) and the relief cavity (13) are all arranged in a through manner; A water outlet (18) and a water inlet (19) are provided at both upper and lower ends of one side of the pump housing (2), and the water inlet (19) is connected to a pump inlet water suction chamber at the bottom of the pump housing (2); a discharge pipe (3) is connected to one side of the pump housing (2); the upper part of the discharge pipe (3) is connected to a sealed chamber (14), and the bottom part is connected to one side of the pump inlet water suction chamber; a balance pipe (12) is connected to the other side of the pump housing (2); the upper part of the balance pipe (12) is connected to the sealed chamber (14), and the bottom part is connected to a water pressure chamber (21); the water pressure chamber (21) is connected to the pump inlet water suction chamber; An annular water absorption chamber (17) is provided on the upper part of the water inlet chamber cover (1), and the annular water absorption chamber (17) is in continuous connection with the water inlet (19); A mechanical sealing ring (10) is installed inside the sealing cavity (14); The top of the pump housing (2) is bolted to a vertical support frame (8), a vertical direct-coupled motor (9) is mounted on the top of the vertical support frame (8), and an output shaft of the vertical direct-coupled motor (9) is fixedly connected to a rotating shaft (15); The steps used by the vertical barrel multistage pump include: Step 1: The vertical direct-connected motor (9) drives the rotating shaft (15) to rotate, thereby driving a plurality of impellers (4), guide vanes (5) and interstage plates (6) outside the rotating shaft (15) to rotate, and water enters the interior of the pump inlet water suction chamber from the water inlet (19). The water inside the pump inlet water suction chamber flows upward as the rotating shaft (15) rotates, and enters the interior of each mounting hole (20) in sequence; Step 2: During the upward flow of water, a portion of the water enters the top unloading chamber (13), and the other portion is discharged from the water outlet (18); after the water in the unloading chamber (13) leaks into the sealing chamber (14), the water flows back from the unloading pipe (3) to the pump inlet water suction chamber, and the water in the pressure chamber enters the sealing chamber (14) from the balance pipe (12) to flush the mechanical sealing ring (10) inside the sealing chamber (14).

2. A vertical cylindrical multistage pump according to claim 1, characterized in that: A sealing unloading plate (7) is connected between the sealing chamber (14) and the unloading chamber (13), and the rotating shaft (15) passes through the mechanical sealing ring (10) and the sealing unloading plate (7).

3. A vertical cylindrical multistage pump according to claim 1, characterized in that: A sliding bearing (11) is installed inside the bottom end of the water inlet chamber cover (1) via a bearing cavity, the bottom of the rotating shaft (15) is rotatably connected to the water inlet chamber cover (1) via the sliding bearing (11), and an "○"-shaped sealing gasket (16) is installed outside the rotating shaft (15) at the connection with the water inlet chamber cover (1).

4. A vertical cylindrical multistage pump according to claim 1, characterized in that: The sealing cavity (14), the unloading cavity (13) and the mounting hole (20) are all arranged in a cylindrical shape, and the sealing cavity (14), the unloading cavity (13) and the mounting hole (20) are all arranged concentrically.

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