Drainage structure of internal circulation submersible pump
By designing a drain structure in the internal circulation submersible pump, the rapid discharge of the mechanical seal cavity is achieved using a drain flange and drain pipe, which solves the problems of circulating tap water blockage and mechanical seal seat failure, simplifies the maintenance process, and improves the motor heat dissipation efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LEO GRP PUMP TECH CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-05-01
AI Technical Summary
Existing submersible pumps are prone to clogging of the inlet and outlet channels of circulating tap water when the medium contains a large amount of particles or is relatively viscous, which affects the medium volume and the heat dissipation of the motor. Furthermore, the mechanical seal seat needs to be completely disassembled and repaired after failure, resulting in a long maintenance cycle.
Design a drain structure for an internal circulation submersible pump, including a motor end cover, a mechanical seal seat, a partition, and a pump cover. The mechanical seal cavity is connected to the outside through a drain flange and a drain pipe. The cooling medium is discharged using a drain plug, avoiding the need for complete disassembly of the mechanical seal seat.
It reduces the maintenance time and cycle of submersible pumps, improves the heat dissipation efficiency of motors, and simplifies the maintenance process of mechanical seals.
Smart Images
Figure CN224187765U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of submersible pump components, and in particular to a water discharge structure for an internal circulation submersible pump. Background Technology
[0002] Submersible sewage pumps mainly use external circulating tap water to cool the motor. However, when the medium contains a lot of particles or is relatively viscous, long-term operation can cause blockages in the inlet and outlet channels of the circulating tap water, which will affect the amount of medium water and the motor's cooling effect.
[0003] Chinese patent application number 2024117706364 discloses a water pump cooling structure and a sewage pump. The water pump cooling structure includes a motor housing, a flow guide shroud, and a cooling partition. The cooling partition is installed on the outer wall of the motor housing to form a cooling chamber between the cooling partition and the motor housing. The motor housing has multiple return holes and multiple flow guide holes spaced at intervals. The return holes and flow guide holes are located at the bottom of the cooling chamber. The flow guide shroud is installed on the motor housing, and a flow guide channel is formed between the flow guide shroud and the motor housing. The flow guide holes are located within the flow guide channel.
[0004] The bottom of the motor housing is provided with a medium return cavity. Both the return hole and the guide hole are connected to the medium return cavity. An impeller is provided in the medium return cavity, and the cooling medium can flow from the return hole to the guide hole.
[0005] Regarding the aforementioned related technologies, the inventors discovered that the motor housing is divided into an upper housing and a lower housing. An organic seal seat is installed on the lower housing, and an inner organic seal is provided in the organic seal seat for assembling the motor drive shaft. When the inner organic seal fails, the cooling medium can easily enter the motor cavity through the organic seal seat, requiring the entire organic seal seat to be disassembled and repaired, resulting in a long maintenance cycle. Therefore, there are certain areas for improvement. Utility Model Content
[0006] To reduce maintenance time, this application provides a water discharge structure for an internal circulation submersible pump.
[0007] The water discharge structure of the internal circulation submersible pump provided in this application adopts the following technical solution:
[0008] A drain structure for an internal circulation submersible pump includes a motor end cover, a mechanical seal seat, a partition, and a pump cover. The mechanical seal seat is mounted on the motor end cover. The partition is located outside the mechanical seal seat and mounted on the mechanical seal seat. The pump cover is located outside the partition and mounted on the motor end cover. A mechanical seal cavity is provided inside the mechanical seal seat. An installation cavity is provided on the pump cover. A drain flange is provided on the installation cavity. A drain pipe is provided in the drain flange. The drain pipe passes through the partition and extends into the mechanical seal cavity of the mechanical seal seat. The drain pipe is sealed to the mechanical seal seat. A drain plug is installed on the drain flange.
[0009] Preferably, the mechanical seal seat is provided with a drain hole, the drain hole is provided with a tapered internal thread section, and the drain pipe is provided with a tapered external thread section that mates with the tapered internal thread section.
[0010] Preferably, a leakage detection sensor that extends into the mechanical seal cavity is installed on the motor end cover.
[0011] Preferably, the corner of the drain flange is bolted to the pump cover.
[0012] Preferably, a sealing gasket is provided between the drain flange and the pump cover.
[0013] Preferably, the drain flange is provided with a drain cavity and an installation through hole that are interconnected. The drain pipe is inserted into the installation through hole, passes through the partition, and extends into the mechanical seal cavity of the mechanical seal seat. The mechanical seal cavity and the drain cavity are kept in communication through the drain pipe.
[0014] Preferably, a sealing ring is provided between the drain pipe and the mounting through hole.
[0015] Preferably, the drain plug is threaded onto the drain flange to seal the drain cavity.
[0016] Preferably, the end of the drain pipe is provided with a rotating groove.
[0017] Preferably, a sealing ring is provided between the drain plug and the drain flange.
[0018] In summary, this application includes at least one of the following beneficial technical effects:
[0019] When the inner mechanical seal in the mechanical seal holder fails or there is a small leak during operation, the cooling medium enters the mechanical seal cavity of the mechanical seal holder. By unscrewing the drain plug, the mechanical seal cavity is connected to the outside through the drain pipe, and the cooling medium in the mechanical seal cavity can be discharged through the drain pipe. The above-mentioned drain structure can effectively reduce the maintenance time and cycle of the internal circulation submersible pump, without the need to disassemble the entire mechanical seal holder in the internal circulation submersible pump. Attached Figure Description
[0020] Figure 1 This is the first structural diagram of the water discharge structure.
[0021] Figure 2 This is a schematic diagram of the second structure of the water discharge structure.
[0022] Figure 3 This is a schematic diagram of the water discharge structure installation.
[0023] Explanation of reference numerals in the attached drawings: 1. Motor end cover; 2. Mechanical seal seat; 3. Separator; 4. Pump cover; 5. Motor housing; 6. Motor cavity; 7. Stator; 8. Rotor; 9. Drive shaft; 10. Outer cylinder; 11. Cooling chamber; 12. Inner cylinder; 13. Guide chamber; 14. Medium guide chamber; 15. Medium return chamber; 16. Connecting port; 17. Guide port; 18. Return port; 19. Inner mechanical seal; 20. Circulating impeller; 21. Outer mechanical seal; 22. Mounting cavity; 23. Drain flange; 24. Sealing gasket; 25. Drain pipe; 26. Drain cavity; 27. Mounting through hole; 28. Sealing ring; 29. Through hole; 30. Drain hole; 31. Rotating groove; 32. Drain plug; 33. Sealing ring; 34. Leakage detection sensor; 35. Mechanical seal cavity. Detailed Implementation
[0024] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.
[0025] A water discharge structure for an internal circulation submersible pump, referring to Figure 1 and Figure 2 As shown, it includes a motor end cover 1, a mechanical seal seat 2, a partition 3, and a pump cover 4. The mechanical seal seat 2 is mounted on the motor end cover 1 via a flange. The partition 3 is mounted on the mechanical seal seat 2 via bolts and is located outside the mechanical seal seat 2. The pump cover 4 is mounted on the motor end cover 1 via a flange and is located outside the partition 3. The partition 3 is located between the mechanical seal seat 2 and the pump cover 4.
[0026] A motor housing 5 is provided on the motor end cover 1. A motor cavity 6 is provided inside the motor housing 5. A stator 7 and a rotor 8 are provided inside the motor cavity 6. A drive shaft 9 is provided on the rotor 8. An outer cylinder 10 is provided outside the motor housing 5. A cooling chamber 11 is formed between the outer cylinder 10 and the motor housing 5. An inner cylinder 12 is provided in the cooling chamber 11 of the motor housing 5. A flow guiding chamber 13 is formed between the inner cylinder 12 and the motor housing 5. The flow guiding chamber 13 and the cooling chamber 11 are connected above the inner cylinder 12.
[0027] A medium guiding cavity 14 is formed between the mechanical seal seat 2 and the partition body 3, and a medium return cavity 15 is formed between the partition body 3 and the pump cover 4. The partition body 3 is provided with a connecting port 16, through which the medium return cavity 15 and the medium guiding cavity 14 are connected. The motor housing 5 is provided with a guiding port 17 that connects the medium guiding cavity 14 and the guiding chamber 13, and the motor housing 5 is provided with a return port 18 that connects the medium return cavity 15 and the cooling chamber 11.
[0028] The drive shaft 9 passes through the mechanical seal seat 2, the connecting port 16 and the pump cover 4 respectively. The mechanical seal seat 2 is provided with an inner mechanical seal 19 mounted on the drive shaft 9. The connecting port 16 is provided with a circulating impeller 20 mounted on the drive shaft 9. The pump cover 4 is provided with an outer mechanical seal 21 mounted on the drive shaft 9.
[0029] The drive shaft 9 drives the circulating impeller 20 to rotate. The circulating impeller 20 can guide the cooling medium from the medium return cavity 15 to the medium guide cavity 14. The cooling medium circulates in the medium guide cavity 14, guide cavity 13, cooling cavity 11, medium return cavity 15, and medium guide cavity 14.
[0030] When the inner seal 19 fails, the cooling medium can easily enter the motor cavity 6 through the seal seat 2. To avoid disassembling and repairing the entire seal seat 2,
[0031] Reference Figure 2 and Figure 3 As shown in this application, the pump cover 4 is provided with an installation cavity 22, and a drain flange 23 is provided on the installation cavity 22. The corner of the drain flange 23 is installed on the pump cover 4 by bolts. A sealing gasket 24 is provided between the drain flange 23 and the pump cover 4 so that the drain flange 23 can seal the installation cavity 22.
[0032] A drain pipe 25 is provided in the drain flange 23. The drain pipe 25 passes through the partition 3 and extends into the mechanical seal cavity 35 of the mechanical seal seat 2. Specifically, the drain flange 23 is provided with a drain cavity 26 and an installation through hole 27 that are interconnected. The drain pipe 25 is inserted into the installation through hole 27, and a sealing ring 28 is provided between the drain pipe 25 and the installation through hole 27.
[0033] The partition 3 is provided with a through hole 29. The drain pipe 25 passes through the through hole 29 of the partition 3 and extends into the mechanical seal cavity 35 of the mechanical seal seat 2. A slight gap is maintained between the through hole 29 and the outer wall of the drain pipe 25 to facilitate assembly and rotational installation of the drain pipe 25. The drain pipe 25 keeps the mechanical seal cavity 35 and the drain cavity 26 connected.
[0034] The drain pipe 25 is sealed to the mechanical seal seat 2. In one embodiment, the mechanical seal seat 2 has a drain hole 30 with a tapered internal thread section, and the drain pipe 25 has a tapered external thread section that mates with the tapered internal thread section. To facilitate the rotational installation of the drain pipe 25, a rotating groove 31 is provided at the end of the drain pipe 25.
[0035] A drain plug 32 is installed on the drain flange 23. The drain plug 32 is threaded onto the drain flange 23 to seal the drain cavity 26. A sealing ring 33 is provided between the drain plug 32 and the drain flange 23.
[0036] When the inner mechanical seal 19 in the mechanical seal seat 2 fails or there is a small leakage during operation, the cooling medium enters the mechanical seal cavity 35 of the mechanical seal seat 2. By unscrewing the drain plug 32, the mechanical seal cavity 35 is connected to the outside through the drain pipe 25, and the cooling medium in the mechanical seal cavity 35 can be discharged through the drain pipe 25. The above-mentioned drain structure can effectively reduce the maintenance time and cycle of the internal circulation submersible pump, without the need to disassemble the entire mechanical seal seat 2 in the internal circulation submersible pump.
[0037] It is worth noting that a leakage detection sensor 34 is installed on the motor end cover 1, extending into the mechanical seal cavity 35. The leakage detection sensor 34 is connected to the host computer. The leakage detection sensor 34 can be a liquid level sensor. The leakage detection sensor 34 can detect whether there is cooling medium in the mechanical seal cavity 35. When the leakage detection sensor 34 detects the presence of cooling medium in the mechanical seal cavity 35, it can transmit a warning signal to the host computer, thereby facilitating maintenance by the staff.
[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A discharge structure for an internal circulation submersible pump, comprising a motor end cover (1), a mechanical seal seat (2), a partition (3), and a pump cover (4), wherein the mechanical seal seat (2) is mounted on the motor end cover (1), the partition (3) is located outside the mechanical seal seat (2) and mounted on the mechanical seal seat (2), and the pump cover (4) is located outside the partition (3) and mounted on the motor end cover (1), wherein a mechanical seal cavity (35) is provided inside the mechanical seal seat (2), characterized in that, The pump cover (4) is provided with an installation cavity (22), and a drain flange (23) is provided on the installation cavity (22). A drain pipe (25) is provided in the drain flange (23). The drain pipe (25) passes through the partition (3) and extends into the mechanical seal cavity (35) of the mechanical seal seat (2). The drain pipe (25) is sealed with the mechanical seal seat (2). A drain plug (32) is installed on the drain flange (23).
2. The water discharge structure of an internal circulation submersible pump according to claim 1, characterized in that, The mechanical seal seat (2) is provided with a drain hole (30), the drain hole (30) is provided with a tapered internal thread section, and the drain pipe (25) is provided with a tapered external thread section that mates with the tapered internal thread section.
3. The water discharge structure of an internal circulation submersible pump according to claim 1, characterized in that, A leakage detection sensor (34) is installed on the motor end cover (1) and extends into the mechanical seal cavity (35).
4. The water discharge structure of an internal circulation submersible pump according to claim 1, characterized in that, The corner of the drain flange (23) is bolted to the pump cover (4).
5. The water discharge structure of an internal circulation submersible pump according to claim 1, characterized in that, A sealing gasket (24) is provided between the drain flange (23) and the pump cover (4).
6. The water discharge structure of an internal circulation submersible pump according to claim 1, characterized in that, The drain flange (23) is provided with a drain chamber (26) and an installation through hole (27) that are interconnected. The drain pipe (25) is inserted into the installation through hole (27), passes through the partition (3), and extends into the mechanical seal cavity (35) of the mechanical seal seat (2). The mechanical seal cavity (35) and the drain chamber (26) are connected by the drain pipe (25).
7. The water discharge structure of an internal circulation submersible pump according to claim 6, characterized in that, A sealing ring (28) is provided between the drain pipe (25) and the mounting through hole (27).
8. The water discharge structure of an internal circulation submersible pump according to claim 6, characterized in that, The drain plug (32) is threaded onto the drain flange (23) to seal the drain cavity (26).
9. The water discharge structure of an internal circulation submersible pump according to claim 1, characterized in that, The end of the drain pipe (25) is provided with a rotating groove (31).
10. The water discharge structure of an internal circulation submersible pump according to claim 1, characterized in that, A sealing ring (33) is provided between the drain plug (32) and the drain flange (23).