A submersible axial flow pump with a sealing device

Abstract

This application relates to a submersible axial flow pump with a sealing device, comprising an outer cylinder, an inner cylinder, and a cylinder cover. The inner cylinder and outer cylinder are connected by a connecting plate, and the cylinder cover is disposed on the outer cylinder. A drive device is disposed between the connecting plate and the inner cylinder. A first sealing device is disposed between the cylinder cover and the outer cylinder, and a second sealing device is disposed between the drive device and the inner cylinder. The first sealing device includes a rubber sleeve, an elastic connecting ring, and a locking assembly. Both the cylinder cover and the outer cylinder have a first stepped groove, and the outer cylinder has a second stepped groove. The cylinder cover abuts against the bottom wall of the second stepped groove. The rubber sleeve is fitted onto the first stepped groove, the elastic connecting ring is fitted onto the rubber sleeve, and the locking assembly secures the rubber sleeve. This application uses the first and second sealing devices to seal the drive device, reducing the amount of liquid entering the power supply section of the drive device, thereby reducing the possibility of safety hazards in the drive device.

Description

Technical Field

[0001] This application relates to the field of axial flow pumps, and more particularly to a submersible axial flow pump with a sealing device. Background Technology

[0002] An axial flow pump is a type of water pump that can make liquid flow axially. Its principle is to use the rotation of the impeller to draw liquid in from the pump inlet and then push it out axially. Axial flow pumps are usually used in high-flow applications, such as drainage, irrigation, and cooling systems.

[0003] A submersible axial flow pump is a type of pump that draws liquid from the bottom and discharges it upwards. It consists of a motor, an axial flow impeller, and a pump body. The motor drives the axial flow impeller to rotate via a shaft, thereby generating suction to draw liquid into the pump body and discharge it through the pump body. Submersible axial flow pumps are often used underwater for pumping operations; therefore, they require high sealing performance, especially for the drive motor.

[0004] In existing submersible axial flow pumps, the drive motor is installed inside the casing cover, which is only attached to the outer casing by a knob. Since the casing cover and the outer casing only rotate, they become loose after prolonged use, causing localized leakage. At the same time, inside the casing, the water flow continuously impacts the connection between the pump shaft and the motor shaft, making the seal relatively weak and prone to leakage. Therefore, both of these areas are prone to leakage, posing certain safety hazards. Summary of the Invention

[0005] To reduce the potential safety hazards caused by water seepage at the installation location of the axial flow pump drive unit, this application provides a submersible axial flow pump with a sealing device.

[0006] The submersible axial flow pump with a sealing device provided in this application adopts the following technical solution:

[0007] A submersible axial flow pump with a sealing device includes an outer cylinder, an inner cylinder, and a cover. The top end of the inner cylinder is connected to the upper end of the outer cylinder via a connecting plate. The cover is disposed on the outer cylinder and covers the connecting plate. An inlet is provided at the lower end of the outer cylinder, and an outlet is provided on one side of the upper end of the outer cylinder, located below the connecting plate. A driving device is disposed between the connecting plate and the inner cylinder, and the driving device is located inside the cover. A first sealing device is disposed between the cover and the outer cylinder, and a sealing device is disposed between the driving device and the inner cylinder. The second sealing device comprises a rubber sleeve, an elastic connecting ring, and a locking assembly. A first stepped groove is provided on the outer side wall of the lower end of the cylinder cover and the outer side wall of the upper end of the outer cylinder. A second stepped groove is provided on the vertical side wall of the first stepped groove of the outer cylinder. The lower end face of the cylinder cover abuts against the bottom wall of the second stepped groove. The rubber sleeve is fitted onto the first stepped groove on the outer cylinder and the cylinder cover. The elastic connecting ring is fitted onto the rubber sleeve. The locking assembly is disposed on the elastic connecting ring to fix the rubber sleeve.

[0008] By adopting the above technical solution, when connecting and installing the cylinder cover and the outer cylinder, the lower end face of the cylinder cover abuts against the bottom wall of the second stepped groove, the rubber sleeve is fitted on the vertical side wall of the first stepped groove, and then the elastic connecting ring is fitted on the outer wall of the rubber sleeve. The locking component drives the elastic connecting ring to tighten the rubber sleeve, reducing the reverse loosening and rotation between the upper end of the cylinder cover and the outer cylinder, thereby reducing the possibility of liquid entering the cylinder cover from the end face contact point of the first stepped groove, thus improving the sealing effect between the cylinder cover and the outer cylinder. The drive device and the inner cylinder are sealed by a second sealing device. By installing a sealable device between the cylinder cover and the outer cylinder, and between the inner cylinder and the drive device, the possibility of liquid entering the power connection part of the drive device from the upper end of the cylinder cover and the outer cylinder is reduced, thereby reducing the possibility of safety hazards in the drive device.

[0009] Optionally, a sealing assembly is provided on the bottom wall of the second stepped groove. The sealing assembly includes a sealing gasket and a support member. A support groove is provided on the bottom wall of the second stepped groove. A vertically downward extending connecting groove is provided on the bottom wall of the support groove. The support member is disposed in the connecting groove and extends into the support ring. The sealing gasket is disposed in the support groove. The upper side of the sealing gasket is embedded and connected to the lower end face of the cylinder cover.

[0010] By adopting the above technical solution, a support member and a sealing gasket are installed between the bottom wall of the second stepped groove and the lower end face of the cylinder cover. When the cylinder cover is installed on the upper end of the outer cylinder and the lower end face of the cylinder cover is close to the bottom wall of the second stepped groove, the cylinder cover abuts against the sealing gasket downwards, and the support member supports the sealing gasket upwards. This allows the sealing gasket to fit tightly against the groove wall of the support groove under the pressure of the cylinder cover, thereby improving the sealing performance between the cylinder cover and the outer cylinder and reducing the possibility of liquid entering the cylinder cover from between the lower end face of the cylinder cover and the bottom wall of the second stepped groove.

[0011] Optionally, the support member includes a support ring and a support spring. The lower end of the support spring is disposed on the bottom end of the connecting groove, and the upper end extends vertically upward. The support ring is slidably disposed in the connecting groove in the vertical direction. The upper end of the support spring is connected to the support ring. When the upper side of the sealing gasket is embedded and connected to the lower end face of the cylinder cover, the sealing gasket presses down on the support ring and the support spring.

[0012] By adopting the above technical solution, when the support member supports the sealing gasket, the sealing gasket presses the support spring downward on the support ring, the support spring shortens downward, and the support ring slides in the connecting groove, so that the sealing gasket fits downward with the support groove. When the support spring is compressed, it generates an upward elastic force against the sealing gasket, so that the sealing gasket can fit better in the support groove and the lower end face of the cylinder cover, thereby improving the sealing effect of the sealing gasket.

[0013] Optionally, the locking assembly includes a first locking plate, a second locking plate, and a locking rod. The elastic connecting ring has a notch. The first locking plate is disposed on one end of the elastic connecting ring, and the second locking plate is disposed on the other end of the elastic connecting ring. The locking rod is disposed between the first locking plate and the second locking plate. When the locking rod rotates, the first locking plate and the second locking plate move closer to each other or further away from each other, thereby driving the rubber sleeve to seal the connection between the outer cylinder and the first stepped groove on the cylinder cover.

[0014] By adopting the above technical solution, when the locking assembly drives the elastic connecting ring to tighten the sealing sleeve, rotating the locking rod causes the first locking plate and the second locking plate to move closer or further apart on the locking rod, thereby causing the sealing sleeve to tighten or loosen, thus sealing the connection between the first stepped groove on the cylinder cover and the first stepped groove on the outer cylinder. This reduces the possibility of the cylinder cover loosening from the upper end of the outer cylinder after prolonged use, thereby reducing the possibility of reduced sealing effect and liquid seepage from the two first stepped grooves.

[0015] Optionally, a connecting piece is provided between the first locking piece and the end of the elastic connecting ring. One end of the connecting piece is disposed on the elastic connecting ring, and the other end extends to the other end of the elastic connecting ring and is slidably connected. When the connecting piece slides on the elastic connecting ring, the two ends of the elastic connecting ring gradually approach and abut or move away from each other.

[0016] By adopting the above technical solution, when the elastic connecting ring tightens the sealing ring, rotating the locking rod causes the first locking piece and the second locking piece to move away from each other on the locking rod, thereby causing the connecting piece to slide on one end of the elastic connecting ring. The two ends of the elastic connecting ring approach and contact each other, thereby sealing the cylinder cover and the outer cylinder on the vertical circumference of the first stepped groove, reducing the possibility of gaps appearing on the circumference of the sealing ring due to the gaps in the elastic connecting ring.

[0017] Optionally, the driving device includes a drive motor, a pump shaft, and an impeller. The drive motor is mounted on a connecting plate and located above the inner cylinder. The pump shaft is rotatably mounted on the inner cylinder and is drive-connected to the pump shaft. The impeller is rotatably mounted on the inner cylinder and located below the inner cylinder and is drive-connected to the pump shaft. The second sealing device is located between the pump shaft and the inner cylinder.

[0018] By adopting the above technical solution, when the axial flow pump is running, the drive motor is started, and the drive motor drives the pump shaft to rotate on the inner cylinder. The rotation of the pump shaft drives the impeller to rotate on the inner cylinder. Through the rotation of the impeller, a pressure difference is formed on the upper and lower sides of the impeller, which in turn drives the liquid below the outer cylinder to enter the outer cylinder from the inlet. The liquid entering the outer cylinder is transported between the pump shaft and the inner cylinder and sealed by the second sealing device, reducing the liquid from entering the drive motor along the pump shaft, thereby reducing the possibility of safety hazards in the drive motor due to sealing problems.

[0019] Optionally, the second sealing device includes a drainage component, a first sealing ring, and a second sealing ring. The first and second sealing rings are disposed on the inner cylinder and sleeved with the pump shaft. The second sealing ring is located below the first sealing ring. The drainage component is disposed between the inner cylinder and the pump shaft. The drainage component is located below the first sealing ring and is used to drain water that enters between the pump shaft and the inner cylinder.

[0020] By adopting the above technical solution, when the second sealing device seals the pump shaft and the inner cylinder, the liquid rising along the pump shaft is discharged through the drainage component, reducing the liquid rising along the pump shaft to the drive motor during the pump shaft rotation. A small amount of liquid that seeps upward along the pump shaft is blocked by the first sealing ring and the second sealing ring, thereby reducing the possibility of liquid seeping upward from between the pump shaft and the inner cylinder to the drive motor, which could pose a safety hazard to the drive motor.

[0021] Optionally, the drainage assembly includes a liquid guiding block, a drain pipe, and a drain valve. The liquid guiding block is integrally mounted on the pump shaft and is rotatably connected to the inner cylinder. The outer diameter of the liquid guiding block gradually increases radially upward along the pump shaft. A liquid accumulation groove is formed on the upper end of the liquid guiding block, with the groove opening facing downward. The drain pipe is mounted on the inner cylinder, with one end extending into the liquid accumulation groove and the other end extending away from the pump shaft to the outer wall of the inner cylinder. The drain valve is mounted on the drain pipe and is a one-way drain valve.

[0022] By adopting the above technical solution, when the drainage component discharges liquid, the liquid slides along the outer wall of the liquid guide block to the liquid accumulation tank at the bottom of the liquid guide block. The liquid accumulation tank reduces the continuous upward seepage of liquid. The liquid guide block rotates together with the pump shaft. During the rotation, the liquid is thrown away from the liquid guide block, causing the liquid to move away from the liquid guide block and enter the drain pipe at the liquid guide block. The liquid in the drain pipe flows out of the drain pipe along the drain pipe, thereby discharging the liquid at the pump shaft and reducing the possibility of the liquid continuously seeping upward into the drive motor.

[0023] Optionally, multiple drain pipes are distributed circumferentially along the pump shaft, and all of the drain pipes are inclined along the rotation direction of the pump shaft. A baffle plate is provided on the inner cylinder above the liquid guide block, and the baffle plate reduces the upward flow of liquid between the inner cylinder and the liquid guide block.

[0024] By adopting the above technical solution, multiple drainage pipes are used for drainage, increasing the water volume at the drainage point and reducing the upward seepage of liquid. Liquid that does not enter the drainage pipes flows downward under the obstruction of the baffle plate, thereby reducing the continuous upward seepage of liquid at the liquid guide block and thus reducing the possibility of liquid entering the drive motor.

[0025] Optionally, a filtration device for reducing the entry of liquid residue into the inlet is provided at the lower end of the outer cylinder. The filtration device includes a filter cover, a filter element, and an installation assembly. The installation assembly is disposed on the lower end face of the outer cylinder, the filter cover is disposed on the installation assembly, and the filter cover is detachably disposed through the installation assembly. The filter element is disposed on the filter cover and is used to filter residue. The filter cover is used to support the filter element.

[0026] By adopting the above technical solution, when the liquid enters the outer cylinder from the inlet, the residue in the liquid is filtered by the filtration device. The filter element is installed at the inlet at the lower end of the outer cylinder through the filter cover, and then the filter element is installed in the filter cover, thereby filtering the residue in the liquid and reducing the possibility of residue entering the outer cylinder. When it is necessary to disassemble the filter cover or filter element, it can be disassembled by the installation component, reducing the possibility of residue adhering to the filter cover and filter element, thereby affecting the filtration effect of the filter element.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. Install a first sealing device between the top of the cap and the top of the outer cylinder to reduce the possibility that liquid may seep into the cap from between the cap and the outer cylinder due to loosening between the cap and the outer cylinder after long-term use, which could lead to safety hazards at the drive device.

[0029] 2. Install a sealing assembly between the lower end face of the cap and the bottom wall of the second stepped groove on the outer cylinder to reduce the possibility of liquid entering the cap from between the lower end face of the cap and the bottom wall of the second stepped groove.

[0030] 3. The second sealing device between the pump shaft and the inner cylinder reduces the possibility of liquid seeping upwards along the pump shaft and reaching the drive motor, thus preventing potential safety hazards to the drive motor. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0032] Figure 2 This is an overall cross-sectional view of an embodiment of this application.

[0033] Figure 3 This is a schematic diagram of the installation of the second sealing device in the embodiments of this application.

[0034] Figure 4 This is an exploded schematic diagram of the first sealing device and sealing assembly in the embodiments of this application.

[0035] Figure 5 yes Figure 2 Enlarged view of point A in the middle.

[0036] Figure 6 yes Figure 1 Enlarged view of section B in the middle.

[0037] Figure 7 This is a schematic diagram of the structure of the filtering device in the embodiments of this application.

[0038] Explanation of reference numerals in the attached drawings: 1. Outer cylinder; 11. Inlet; 12. Outlet; 13. Second step groove; 131. Support groove; 132. Connecting groove; 133. Extrusion groove; 2. Cylinder cover; 21. First step groove; 3. Inner cylinder; 31. Connecting plate; 4. First sealing device; 41. Rubber sleeve; 42. Elastic connecting ring; 421. Connecting piece; 43. Locking assembly; 431. First locking piece; 432. Second locking piece; 433. Locking rod; 5. Filter device; 51. Mounting assembly; 511. Mounting ring; 512. Connecting ring; 513. Sliding ring; 52. Filter cover; 53. Filter element; 6. Drive unit; 61. Drive motor; 62. Pump shaft; 63. Impeller; 631. Conical guide plate; 7. Second sealing device; 71. First sealing ring; 72. Second sealing ring; 73. Drainage assembly; 731. Liquid guide block; 732. Drain pipe; 733. Drain valve; 734. Liquid collection tank; 735. Water baffle; 8. Sealing assembly; 81. Sealing gasket; 82. Support member; 821. Support ring; 822. Support spring. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0040] This application discloses a submersible axial flow pump with a sealing device. (Refer to...) Figure 1 and Figure 2 The system includes an outer cylinder 1, an inner cylinder 3, and a cylinder cover 2. A connecting plate 31 is installed between the top of the inner cylinder 3 and the outer cylinder 1. The top of the outer cylinder 1 is located above the connecting plate 31. The cylinder cover 2 is threadedly connected to the upper end of the outer cylinder 1 and is located above the connecting plate 31. A water inlet 11 is provided at the bottom of the outer cylinder 1, and a water outlet 12 is provided on one side of the upper end of the outer cylinder 1. The water outlet 12 is located below the connecting plate 31. A driving device 6 is installed between the connecting plate 31 and the inner cylinder 3.

[0041] Reference Figure 2The drive unit 6 includes a drive motor 61, a pump shaft 62, and an impeller 63. The drive motor 61 is mounted on the connecting plate 31. The pump shaft 62 is rotatably mounted between the connecting plate 31 and the inner cylinder 3. The output shaft of the drive motor 61 is coaxially connected to the upper end of the pump shaft 62. The lower end of the pump shaft 62 extends vertically downward. The impeller 63 is rotatably mounted at the lower end of the inner cylinder 3. A conical guide plate 631 is mounted on the pump shaft 62. The conical guide plate 631 is located below the inner cylinder 3. The conical guide plate 631 reduces the possibility of liquid entering from between the bottom end of the inner cylinder 3 and the pump shaft 62. The lower end of the pump shaft 62 is coaxially connected to the impeller 63. When the axial flow pump is working, the drive motor 61 is started, which drives the impeller 63 to rotate through the pump shaft 62. Due to the rotation of the impeller 63, a pressure difference is formed on the upper and lower sides of the impeller 63 in the space between the outer cylinder 1 and the inner cylinder 3, thereby squeezing and conveying the liquid below the outer cylinder 1 downward.

[0042] Reference Figure 2 and Figure 3 A second sealing device 7 is provided between the inner cylinder 3 and the pump shaft 62. The second sealing device 7 includes a drainage component 73, a first sealing ring 71 and a second sealing ring 72. The first sealing ring 71 and the second sealing ring 72 are both installed on the inner cylinder 3. The first sealing ring 71 and the second sealing ring 72 are both sleeved with the pump shaft 62. The second sealing ring 72 is located below the first sealing ring 71.

[0043] The drainage assembly 73 includes a liquid guide block 731, a drain pipe 732, and a drain valve 733. The liquid guide block 731 is integrally mounted on the pump shaft 62 and extends circumferentially along the pump shaft 62. As the liquid guide block 731 extends vertically upward, its outer diameter gradually increases. A liquid accumulation groove 734 is provided on the upper end of the liquid guide block 731, with the opening of the liquid accumulation groove 734 facing downward. The drain pipe 732 is mounted on the inner cylinder 3, with one end close to the liquid accumulation groove 734 and the other end extending to the outer wall of the inner cylinder 3. Multiple drain pipes 732 are distributed circumferentially along the pump shaft 62. Multiple pump shafts 62 are obliquely mounted on the inner cylinder 3 in the direction of rotation of the pump shaft 62. The drain valve 733 is a one-way drain valve, and there are multiple drain valves 733, each corresponding to one of the multiple drain pipes 732. A water valve 733 is installed on the drain pipe 732. A baffle plate 735 is installed on the inner cylinder 3. The baffle plate 735 is located above the liquid guide block 731 and extends downward along the radial direction of the inner cylinder 3. When liquid enters the inner cylinder 3 upward along the pump shaft 62, the liquid flows downward along the inclined direction of the liquid guide block 731. During the rotation of the pump shaft 62, the liquid moves towards the edge of the liquid accumulation tank 734 and enters the drain pipe 732. The liquid that does not enter the drain pipe 732 is blocked by the baffle plate 735 and gathers downward again on the liquid guide block 731. Under the rotation of the pump shaft 62, it re-enters the liquid accumulation tank 734, reducing the upward flow of liquid on the pump shaft 62 to the drive motor 61, thereby reducing the possibility of safety hazards to the drive motor 61 after liquid enters.

[0044] Reference Figure 4 and Figure 5 A sealing assembly 8 is installed between the lower end face of the cylinder cover 2 and the upper end of the outer cylinder 1. The sealing assembly 8 includes a sealing gasket 81 and a support member 82. The support member 82 includes a support ring 821 and a support spring 822. A first step groove 21 extending vertically downward is provided on the upper end face of the outer cylinder 1. A second step groove 13 is provided on the vertical side wall of the first step groove 21. The second step groove 13 extends upward through the upper end face of the outer cylinder 1. The lower end face of the cylinder cover 2 abuts against the bottom wall of the second step groove 13.

[0045] An annular support groove 131 is formed on the bottom wall of the second step groove 13. A vertically downward extending connecting groove 132 is formed on the bottom wall of the support groove 131. The lower end of the support spring 822 is installed on the bottom wall of the connecting groove 132, and the upper end of the support spring 822 extends vertically upward into the support groove 131. A support ring 821 is installed on the upper end of the support spring 822 and is located in the support groove 131. A sealing gasket 81 is placed in the support groove 131. A compression groove 133 coaxial with the support groove 131 is formed on the lower end face of the cylinder cover 2. The cylinder cover 2 is threaded onto the outer cylinder 1 and moves downward toward the second step groove 131. When the bottom wall of the stepped groove 13 is reached, the extrusion groove 133 contacts the sealing gasket 81 and abuts against the sealing gasket 81 downwards. The sealing gasket 81 presses down on the support ring 821 and the support spring 822, causing the support ring 821 to slide downwards in the connecting groove 132 and press against the support spring 822. The support spring 822 abuts against the support ring 821 and the sealing gasket 81 upwards, so that the sealing gasket 81 fits against the groove walls of the support groove 131 and the extrusion groove 133, thereby improving the sealing between the cylinder cover 2 and the outer cylinder 1, reducing the possibility of liquid entering from between the cylinder cover 2 and the outer cylinder 1, and preventing potential safety hazards to the drive motor 61.

[0046] Reference Figure 4 and Figure 6 The first sealing device 4 includes a rubber sleeve 41, an elastic connecting ring 42, and a locking assembly 43. A first stepped groove 21 extending straight upward is also provided on the lower end face of the cylinder cover 2. The first stepped groove 21 on the cylinder cover 2 is coaxial with the first connecting groove 132 on the outer cylinder 1. The rubber sleeve 41 is sleeved on the first stepped groove 21 between the cylinder cover 2 and the outer cylinder 1. The elastic connecting ring 42 is sleeved on the outer wall of the rubber sleeve 41. The elastic connecting ring 42 tightens the rubber sleeve 41 and adheres it to the vertical side wall of the first stepped groove 21 through the locking assembly 43, thereby improving the airtightness between the cylinder cover 2 and the outer cylinder 1 and reducing the possibility of liquid entering between the upper end of the cylinder cover 2 and the outer cylinder 1.

[0047] Locking assembly 43 includes a first locking plate 431, a second locking plate 432, and a locking rod 433. A notch is provided on the elastic connecting ring 42. A connecting piece 421 is mounted on one end of the elastic connecting ring 42. One end of the connecting piece 421 is fixedly mounted on the end of the elastic connecting ring 42, and the other end extends to and slides on the other end of the elastic connecting ring 42. The first locking plate 431 is mounted on the connecting piece 421, located at the point where the connecting piece 421 is away from the connection between the elastic connecting ring 42 and the connecting piece 421. The second locking plate 432 is mounted on the end of the elastic connecting ring 42 where the connecting piece 421 is not mounted. The locking rod 433 is rotatably mounted on the first locking plate 431. Connected to the second locking plate 432, when the locking rod 433 is rotated, the second locking plate 432 gradually moves closer to or away from the first locking plate 431 on the locking rod 433, thereby causing the two ends of the elastic connecting ring 42 to move away from or closer to each other. When the first locking plate 431 and the second locking plate 432 move away from each other, the first locking plate 431 and the connecting plate 421 slide on the elastic connecting ring 42, thereby causing the two ends of the elastic connecting ring 42 to move closer to and abut against each other, so that the rubber sleeve 41 fits on the complete circumference, thereby reducing the possibility that the rubber sleeve 41 may not fit the vertical side wall of the first stepped groove 21 during the tightening process of the elastic connecting ring 42, and thus reducing the possibility of reducing the sealing effect.

[0048] Reference Figure 2 and Figure 7 A filter device 5 is installed at the lower end of the outer cylinder 1 to reduce the amount of liquid residue entering through the inlet 11.

[0049] The filter device 5 includes a filter cover 52, a filter element 53, and a mounting assembly 51. The mounting assembly 51 includes a mounting ring 511, a connecting ring 512, and a sliding ring 513. The mounting ring 511 is mounted on the lower end of the outer cylinder 1 and is coaxial with the inlet 11. The upper end of the connecting ring 512 is slidably sleeved on the mounting ring 511. The sliding ring 513 is slidably mounted on the connecting ring 512. The upper end of the sliding ring 513 is threadedly connected to the lower end of the mounting ring 511. The sliding ring 513 and the upper end of the connecting ring 512 are engaged in the vertical direction. The filter cover 52 is mounted on the lower end of the connecting ring 512. The threaded connection between the sliding ring 513 and the mounting ring 511, and the sliding sleeve connection between the connecting ring 512 and the mounting ring 511, facilitate the removal of the filter cover 52 from the outer cylinder 1.

[0050] The filter element 53 includes a filter screen, which is installed on the inner wall of the filter cover 52. When the drive motor 61 starts and drives the impeller 63 to rotate, the liquid enters the interior of the outer cylinder 1 from the inlet 11 at the filter cover 52 and the filter screen. The filter cover 52 and the filter screen reduce the amount of residue in the liquid entering the outer cylinder 1 with the liquid, thereby reducing the impact of the residue on the axial flow pump.

[0051] The implementation principle of a submersible axial flow pump with a sealing device according to an embodiment of this application is as follows:

[0052] When using an axial flow pump, start the drive motor 61, which drives the impeller 63 to rotate through the pump shaft 62, creating a negative pressure in the space above and below the impeller 63, which drives the liquid below the outer cylinder 1 into the outer cylinder 1 through the inlet 11.

[0053] When residues in the liquid come into contact with the filter cover 52, the residues slide along the outer wall of the filter cover 52, reducing the accumulation of residues on the surface of the filter cover 52, thereby reducing the obstruction of liquid flow caused by the residues.

[0054] After the liquid enters the outer cylinder 1, the guide plate on the pump shaft 62 reduces the possibility of the liquid entering the inner cylinder 3 from between the lower end of the inner cylinder 3 and the pump shaft 62.

[0055] When liquid enters the inner cylinder 3 and is vertically conveyed upward along the pump shaft 62, when the liquid flows to the guide block 731, it flows along the inclined surface of the guide block 731 to the accumulation tank 734. As the guide block 731 rotates, the liquid in the accumulation tank 734 slides away from the guide block 731. Some of the liquid enters the drain pipe 732 and is discharged from the inner cylinder 3. The liquid that does not enter the drain pipe 732 flows back to the guide block 731 under the blocking effect of the baffle plate 735, reducing the possibility of the liquid continuously being conveyed upward along the pump shaft 62 and causing the liquid to enter the drive motor 61, thus posing a safety hazard to the drive motor 61.

[0056] The one-way drain valve 733 reduces the possibility of liquid entering the interior of the inner cylinder 3 from the outside of the inner cylinder 3 along the drain pipe 732, thereby reducing the possibility of liquid entering the drive motor 61.

[0057] The first sealing ring 71 and the second sealing ring 72 reduce the possibility of liquid being continuously transported upward between the pump shaft 62 and the inner cylinder 3.

[0058] The cap 2 and the outer cylinder 1 are sealed by the sealing assembly 8 and the first sealing device 4 to reduce the possibility of liquid entering the cap 2.

[0059] When the sealing assembly 8 seals the space between the cylinder cover 2 and the outer cylinder 1, the cylinder cover 2 abuts against the sealing gasket 81 downwards, and the sealing gasket 81 presses down on the support ring 821 and the support spring 822, causing the support ring 821 to slide vertically downwards in the connecting groove 132, which in turn drives the support spring 822 to abut against the sealing gasket 81 upwards, so that the outer wall of the sealing gasket 81 contacts the outer wall of the support groove 131 and the compression groove 133, thereby improving the sealing effect of the sealing gasket 81.

[0060] The gap between the cylinder cover 2 and the outer cylinder 1 is provided by a rubber sleeve 41, and the rubber sleeve 41 is tightened by an elastic connecting ring 42, thereby reducing the possibility of liquid entering the cylinder cover 2 along the gap between the cylinder cover 2 and the outer cylinder 1.

[0061] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A submersible axial flow pump with sealing device, comprising an outer cylinder (1), an inner cylinder (3) and a cylinder cover (2), the top end of the inner cylinder (3) is provided with a connecting plate (31) on the upper end of the outer cylinder (1), the cylinder cover (2) is arranged on the outer cylinder (1) and covers the connecting plate (31), the lower end of the outer cylinder (1) is provided with a water inlet (11), one side of the upper end of the outer cylinder (1) is provided with a water outlet (12) below the connecting plate (31), a driving device (6) is arranged between the connecting plate (31) and the inner cylinder (3), and the driving device (6) is located in the cylinder cover (2), characterized in that: A first sealing device (4) is provided between the cylinder cover (2) and the outer cylinder (1), and a second sealing device (7) is provided between the drive device (6) and the inner cylinder (3). The first sealing device (4) includes a rubber sleeve (41), an elastic connecting ring (42), and a locking assembly (43). A first step groove (21) is provided on the outer side wall of the lower end of the cylinder cover (2) and the outer side wall of the upper end of the outer cylinder (1). A second step groove (13) is provided on the vertical side wall of the first step groove (21) of the outer cylinder (1). The lower end face of the cylinder cover (2) abuts against the bottom wall of the second step groove (13). The rubber sleeve (41) is sleeved on the first step groove (21) on the outer cylinder (1) and the cylinder cover (2). The elastic connecting ring (42) is sleeved on the rubber sleeve (41). The locking assembly (43) is provided on the elastic connecting ring (42) to fix the rubber sleeve (41). ​ A sealing assembly (8) is provided on the bottom wall of the second step groove (13). The sealing assembly (8) includes a sealing gasket (81) and a support member (82). A support groove (131) is provided on the bottom wall of the second step groove (13). A vertically downward extending connecting groove (132) is provided on the bottom wall of the support groove (131). The support member (82) is provided in the connecting groove (132) and extends into the support groove (131). The sealing gasket (81) is provided in the support groove (131). The upper side of the sealing gasket (81) is embedded and connected to the lower end face of the cylinder cover (2). The support member (82) includes a support ring (821) and a support spring (822). The lower end of the support spring (822) is located on the bottom end of the connecting groove (132), and the upper end extends vertically upward. The support ring (821) slides vertically in the connecting groove (132). The upper end of the support spring (822) is connected to the support ring (821). When the upper side of the sealing gasket (81) is embedded and connected to the lower end face of the cylinder cover (2), the sealing gasket (81) presses down on the support ring (821) and the support spring (822).

2. A submersible axial flow pump with a sealing device according to claim 1, characterized in that: The locking assembly (43) includes a first locking plate (431), a second locking plate (432), and a locking rod (433). The elastic connecting ring (42) has a notch. The first locking plate (431) is located on one end of the elastic connecting ring (42), and the second locking plate (432) is located on the other end of the elastic connecting ring (42). The locking rod (433) is located between the first locking plate (431) and the second locking plate (432). When the locking rod (433) rotates, the first locking plate (431) and the second locking plate (432) move closer to each other or further away from each other, thereby driving the rubber sleeve (41) to seal the connection between the outer cylinder (1) and the first step groove (21) on the cylinder cover (2).

3. A submersible axial flow pump with a sealing device according to claim 2, characterized in that: A connecting piece (421) is provided between the first locking piece (431) and the end of the elastic connecting ring (42). One end of the connecting piece (421) is provided on the elastic connecting ring (42), and the other end extends to the other end of the elastic connecting ring (42) and slides. When the connecting piece (421) slides on the elastic connecting ring (42), the two ends of the elastic connecting ring (42) gradually approach and abut or move away from each other.

4. A submersible axial flow pump with a sealing device according to claim 1, characterized in that: The driving device (6) includes a drive motor (61), a pump shaft (62), and an impeller (63). The drive motor (61) is mounted on the connecting plate (31) and located above the inner cylinder (3). The pump shaft (62) is rotatably mounted on the inner cylinder (3). The drive motor (61) is connected to the pump shaft (62) in a transmission connection. The impeller (63) is rotatably mounted on the inner cylinder (3) and located below the inner cylinder (3). The impeller (63) is connected to the pump shaft (62) in a transmission connection. The second sealing device (7) is located between the pump shaft (62) and the inner cylinder (3).

5. A submersible axial flow pump with a sealing device according to claim 4, characterized in that: The second sealing device (7) includes a drainage component (73), a first sealing ring (71) and a second sealing ring (72). The first sealing ring (71) and the second sealing ring (72) are disposed on the inner cylinder (3) and sleeved with the pump shaft (62). The second sealing ring (72) is located below the first sealing ring (71). The drainage component (73) is disposed between the inner cylinder (3) and the pump shaft (62). The drainage component (73) is located below the first sealing ring (71) and is used to drain the water that enters between the pump shaft (62) and the inner cylinder (3).

6. A submersible axial flow pump with a sealing device according to claim 5, characterized in that: The drainage assembly (73) includes a liquid guide block (731), a drain pipe (732), and a drain valve (733). The liquid guide block (731) is integrally mounted on the pump shaft (62). The liquid guide block (731) is rotatably connected to the inner cylinder (3). The outer diameter of the liquid guide block (731) gradually increases radially upward along the pump shaft (62). A liquid accumulation groove (734) is provided on the upper end of the liquid guide block (731). The groove opening of the liquid accumulation groove (734) faces downward. The drain pipe (732) is mounted on the inner cylinder (3). One end of the drain pipe (732) extends into the liquid accumulation groove (734), and the other end extends away from the pump shaft (62) to the outer wall of the inner cylinder (3). The drain valve (733) is mounted on the drain pipe (732). The drain valve (733) is a one-way drain valve (733).

7. A submersible axial flow pump with a sealing device according to claim 6, characterized in that: Multiple drain pipes (732) are distributed around the pump shaft (62), and all drain pipes (732) are inclined along the rotation direction of the pump shaft (62). A baffle plate (735) is provided on the inner cylinder (3) above the liquid guide block (731). The baffle plate (735) reduces the upward flow of liquid between the inner cylinder (3) and the liquid guide block (731).

8. A submersible axial flow pump with a sealing device according to claim 1, characterized in that: A filter device (5) for reducing the amount of residue in the liquid entering the inlet (11) is provided at the lower end of the outer cylinder (1). The filter device (5) includes a filter cover (52), a filter element (53), and an installation assembly (51). The installation assembly (51) is provided on the lower end surface of the outer cylinder (1). The filter cover (52) is provided on the installation assembly (51). The filter cover (52) is detachably provided through the installation assembly (51). The filter element (53) is provided on the filter cover (52). The filter element (53) is used to filter residue. The filter cover (52) is used to support the filter element (53).

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