Submersible pump sand blocking structure
By designing a combination structure of sand-blocking rings and guide channels in the submersible pump, the problem of silt entering the motor cavity is solved by utilizing centrifugal force and swirling effect, thus achieving long-term stable operation and low wear of the submersible pump in high silt environments.
Patent Information
- Application Number
- CN202522285737.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-29
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-10-29
AI Technical Summary
Existing submersible pumps have difficulty effectively preventing sediment from entering the motor cavity in fluids with high sediment content, resulting in poor isolation and limiting their service life and stability.
A sand-blocking structure for a submersible pump was designed, including a sand-blocking ring and a flow guide groove. It uses centrifugal force and swirling effect to throw out the mud and sand, and combines it with a microporous filter layer to form a double isolation to prevent mud and sand from entering the motor cavity.
It significantly reduces wear on mechanical seals and bearings, extends the service life of motors and seals, and improves the operational stability and convenience of submersible pumps in high-mud and sandy environments.
Smart Images
Figure CN224679743U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of water pump technology, and relates to a submersible pump, particularly a sand-blocking structure for a submersible pump. Background Technology
[0002] A submersible pump is a type of pump that integrates a motor and a water pump on the same shaft and operates while both are immersed in liquid. It is widely used in agricultural irrigation, drainage, mine drainage, river water intake, and sewage treatment. Because submersible pumps operate directly underwater, they are compact, occupy little space, and are easy to use, making them widely used in agriculture and industry.
[0003] Existing technologies primarily focus on inlet protection or material reinforcement, but they still struggle to prevent fine sediment from entering the motor cavity through the pump shaft gap during long-term operation. Especially in fluids with high sediment content, the sediment flows in a spiral pattern with the fluid, continuously eroding the sealing end face along the axial gap, leading to a gradual weakening of the protective effect and making it impossible to achieve durable and reliable isolation.
[0004] Therefore, existing submersible pumps still generally suffer from problems such as poor isolation and easy intrusion of silt into the motor cavity, which limits their service life and stability in water bodies with high silt or impurities. Utility Model Content
[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a sand-blocking structure for a submersible pump. This effectively solves the problems of poor isolation effect and easy intrusion of mud and sand into the motor cavity of existing submersible pumps, which limits their service life and stability in water bodies with high mud and sand content or impurities.
[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses a sand-blocking structure for a submersible pump, including a pump casing, an inlet, and an oil seal. The sand-blocking structure is located at the lower end of the oil seal and is axially connected to the rotating shaft. The sand-blocking structure mainly includes a sand-blocking ring and a guide groove. A conical partition is provided between the oil seal and the sand-blocking ring, with a downwardly protruding protrusion at the center of the partition. The oil seal is housed within the groove of the protrusion. The sand-blocking ring is trapezoidal, with its outer edge tightly fitted to the inner circumference of the partition. The top of the sand-blocking ring has a protrusion with a diameter smaller than its upper surface. At the center of this protrusion is an embedded portion that matches the aforementioned protrusion and protrudes downwards. A guide groove is provided around the outer circumference of the embedded portion, recessed inwards. A sand-discharging groove is provided on the conical inner circumference of the sand-blocking ring to enhance the efficiency of discharging sediment from the water.
[0007] In the aforementioned submersible pump sand-blocking structure, the angle formed between the protrusion and the sand-blocking ring, together with the partition, constitutes a clamping angle, which is used to enhance assembly stability and sealing effect.
[0008] In the aforementioned submersible pump sand-blocking structure, the side where the clamping angle of the sand-blocking ring intersects with the protrusion is provided with a threaded connection structure, which allows for detachable connection between the sand-blocking ring and the sand-blocking ring via the thread, facilitating maintenance and replacement.
[0009] In the aforementioned sand-blocking structure for a submersible pump, an interlocking joint is formed between the embedded part and the protrusion, ensuring that the two remain coaxial and stable during rotation and preventing axial displacement.
[0010] In the aforementioned submersible pump sand-blocking structure, the guiding structure of the guide channel is a spiral guide groove extending from top to bottom, and the groove cross-section is arc-shaped. By cooperating with the centrifugal force generated during the operation of the water pump, it can effectively guide the sediment in the water to move along the guide channel and throw the sediment towards the inner wall of the sand-blocking ring, thereby achieving efficient sediment separation.
[0011] In the aforementioned submersible pump sand-blocking structure, the sand-discharging trough has a spiral annular groove extending from top to bottom along the inner wall of the sand-blocking ring. The groove cross-section is also an arc-shaped structure. Through the swirling effect, the mud and sand discharged through the guide trough can be discharged to the outside of the sand-blocking ring, preventing mud and sand deposition.
[0012] Compared with existing technologies, the sand-blocking structure for submersible pumps provided by this utility model has the following beneficial effects: When the pump shaft rotates, the spiral guide groove on the outer side of the sand-blocking ring can form a reverse water flow pressure zone, forcing the silt particles to be discharged outward under the action of centrifugal force, preventing them from intruding along the pump shaft direction. At the same time, the inner microporous filter layer further blocks fine silt, forming a double isolation effect, fundamentally preventing silt from entering the motor cavity, thereby significantly reducing the wear of mechanical seals and bearings, enabling the submersible pump to maintain stable operation for a long time under high silt conditions, effectively extending the service life of the motor and seals; The guide groove of the sand-blocking ring is spirally distributed. When the pump shaft rotates, the water flow forms a self-circulating guide path in the groove, which can automatically carry out a small amount of silt entering the front end of the seal with the fluid, realizing dynamic sand discharge. This structure enables the pump to automatically remove accumulated silt during operation, eliminating the need for frequent disassembly and maintenance, greatly improving ease of use and reliability. Attached Figure Description
[0013] Figure 1 This is the front view of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of the sand-blocking ring in this utility model; Among them, 1. Pump casing; 2. Inlet hole; 3. Outlet; 4. Oil seal; 5. Rotary shaft; 6. Partition; 61. Protrusion; 62. Clamping angle; 7. Sand baffle ring; 71. Protrusion; 72. Embedded part; 73. Insertion mating part; 74. Guide groove; 75. Sand discharge groove. Detailed Implementation
[0014] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solution of the present invention. However, the described embodiments are only a part of the embodiments of the present invention.
[0015] In the description of this utility model, 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0016] This utility model discloses a sand-blocking structure for a submersible pump. This structure is mainly used in submersible pumps in high-muddy water environments. It aims to effectively prevent mud and sand from entering the motor cavity, extend the service life of the oil seal 4 and bearings, and improve the overall operational reliability of the submersible pump.
[0017] like Figure 1 and Figure 2 As shown in the figure, the submersible pump sand-blocking structure of this embodiment includes a pump casing 1, a water inlet 2, an oil seal 4, and a sand-blocking structure disposed at the lower end of the oil seal 4. The sand-blocking structure is coaxially arranged with the pump's rotating shaft 5 and is installed as a whole in the area below the oil seal 4, forming an axial protection and sediment diversion system. The sand-blocking structure mainly consists of a sand-blocking ring 7 and a diversion groove 74.
[0018] The conical baffle 6 is installed below the oil seal 4, with a downward protruding protrusion 61 at its center. The oil seal 4 is installed in the groove formed on the protrusion 61, thereby ensuring the sealing effect between the oil seal 4 and the baffle 6. The sand-blocking ring 7 has a trapezoidal structure, with its outer edge tightly fitting the inner circumferential surface of the baffle 6 to form a closed sand-proof space. The upper end face of the sand-blocking ring 7 has a slightly smaller diameter protrusion 71. The center of the protrusion 71 has an embedded part 72 that matches the protrusion 61. The outer circumference of the embedded part 72 is provided with a flow guide groove 74 to guide water flow and sediment movement. A conical structure is formed on the inner circumferential surface of the sand-blocking ring 7, and a sand discharge groove 75 is provided along the axial direction to assist in the discharge of sediment particles.
[0019] The baffle 6 and the sand-blocking ring 7 are engaged by a clamping angle 62, which is formed by the protrusion 71 and the upper end face of the sand-blocking ring 7. This structure enables the two to have self-positioning and sealing functions when assembled, thereby enhancing the protective stability. Furthermore, in some embodiments, a threaded connection structure can be provided between the protrusion 71 and the upper end face of the sand-blocking ring 7, which facilitates disassembly and assembly when maintaining or replacing the oil seal 4, reducing maintenance costs. At the same time, the embedded part 72 and the protrusion 61 of the baffle 6 form a plug-in mating part 73, ensuring that the two maintain coaxiality when the rotating shaft 5 rotates, thereby preventing the sand-blocking ring 7 from axially shifting due to water flow impact.
[0020] like Figure 3 As shown, the guide channel 74 is a spiral groove extending from top to bottom with an arc-shaped cross-section. When the submersible pump is running, the rotating shaft 5 drives the sand-blocking ring 7 to rotate at high speed. The water flow and the sediment in it are guided into the guide channel 74 under the action of centrifugal force. The sediment moves downward along the spiral groove and is thrown against the inner wall of the sand-blocking ring 7, thus separating from the clean water. The sediment after being guided by the guide channel 74 finally enters the sand discharge channel 75. The sand discharge channel 75 is also a spiral annular groove structure that extends circumferentially along the inner wall of the sand-blocking ring 7. Through the swirling effect, the sediment is thrown out of the sand-blocking ring 7, thus preventing sedimentation and blockage.
[0021] The working principle of this utility model is as follows: When the submersible pump is working in an environment with a lot of mud and sand, the external sand-laden water flows into the pump chamber through the water inlet 2. Some of the mud and sand approach the oil seal 4 area with the water flow. At this time, the sand-blocking ring 7 effectively throws the mud and sand away from the contact area of the oil seal 4 through the synergistic effect of the guide groove 74 and the sand discharge groove 75 during the rotation process. The oil seal 4 achieves sealing through the groove fitting structure of the protrusion 61, preventing fine particles from entering the motor cavity. The entire structure enables the submersible pump to maintain good sealing performance and low wear characteristics even after long-term operation.
[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A sand-blocking structure for a submersible pump, comprising a pump casing (1), a water inlet (2), and an oil seal (4), characterized in that: The sand-blocking structure is located at the lower end of the oil seal (4) and is axially connected to the rotating shaft (5). The sand-blocking structure mainly includes a sand-blocking ring (7) and a guide groove (74). A conical partition (6) is provided between the oil seal (4) and the sand-blocking ring (7). A downwardly protruding protrusion (61) is provided at the center of the partition (6). The oil seal (4) is installed in the groove of the protrusion (61). The sand-blocking ring (7) is trapezoidal, and its outer edge is tightly fitted to the inner circumference of the partition plate (6). The top of the sand-blocking ring (7) is provided with a protrusion (71) with a diameter smaller than its upper end plane. The center of the protrusion (71) is provided with an embedded part (72) that matches the above-mentioned protrusion (61) and protrudes downward. The outer circumference of the embedded part (72) is provided with a guide groove (74) that is recessed inward around the outer circumference. The inner circumference of the conical sand-blocking ring (7) is provided with a sand discharge groove (75) to enhance the efficiency of throwing out mud and sand from the water.
2. The submersible pump sand-blocking structure according to claim 1, characterized in that: The angle formed between the protrusion (71) and the sand-blocking ring (7) together with the partition (6) constitutes the clamping angle (62).
3. The submersible pump sand-blocking structure according to claim 2, characterized in that: The sand-blocking ring (7) has a threaded connection structure on the side where the clamping angle (62) intersects with the protrusion (71).
4. The submersible pump sand-blocking structure according to claim 1, characterized in that: A mating part (73) is formed between the embedded part (72) and the protrusion (61).
5. The submersible pump sand-blocking structure according to claim 1, characterized in that: The flow guiding structure of the flow guiding groove (74) is a spiral flow guiding groove extending from top to bottom, and the cross section of the groove is arc-shaped.
6. The sand-blocking structure for a submersible pump according to claim 1, characterized in that: The sand discharge trough (75) has a sand discharge structure that is a spiral annular groove extending from top to bottom along the inner wall of the sand-blocking ring (7). The groove cross-section is also an arc-shaped structure.