Anti-sand submersible pump

Abstract

The application provides an anti-sand submersible pump and belongs to the technical field of submersible pumps. The anti-sand submersible pump solves the problem of short service life of the existing submersible pump. The anti-sand submersible pump comprises a shell with a water inlet cavity and a water outlet, a motor fixed in the shell and an impeller fixed on the output shaft of the motor. The shell and the motor are provided with a water passing cavity in the form of a ring and connected with the water outlet. The water inlet cavity is fixed with a guide vane. The impeller is located at the middle of the guide vane. The impeller and the guide vane are made of elastic material. A plurality of first water passing holes are arranged at the circumferential edge of the guide vane at intervals. The water inlet cavity is connected with the water passing cavity through the first water passing holes. The sum of the flow cross-sectional areas of all the first water passing holes is smaller than the flow cross-sectional area of the water passing cavity. The anti-sand submersible pump has the advantages of strong anti-sand capacity and long service life.

Description

Technical Field

[0001] This invention belongs to the field of submersible pump technology, and relates to sand-resistant submersible pumps. Background Technology

[0002] A submersible pump is a water-lifting device that requires the entire unit to be submerged in liquid to operate. It is mainly used to lift water to the ground or a designated location for domestic water supply, mine rescue, industrial cooling, farmland irrigation, seawater lifting, ship ballast adjustment, and can also be used in fountain landscaping.

[0003] Existing submersible pumps, such as the miniature impeller submersible pump disclosed in Chinese patent literature [Patent No.: 202411147004.2; Authorization Announcement No.: CN118654005B], include a pump body, a filter cover, a motor, a closed impeller, a check valve, a pressure switch, and a plug. The filter cover is installed at the bottom of the pump body, forming an inlet chamber between the two. The pump body has a water passage chamber. The bottom of the pump body has a downwardly protruding water passage section, and there is an annular space between the outer wall of the water passage section and the side wall of the inlet chamber. The top of the pump body has an outlet section. The water passage section has a water inlet, which connects the inlet chamber and the water passage chamber. The outlet section has a check channel, and a check valve is installed in the check channel. The motor is installed in the pump body, and the power output end of the motor is connected to the closed impeller. The pressure switch is used to detect the water pressure in the check channel. The plug covers the annular space.

[0004] This type of submersible pump features a closed impeller made of stainless steel. During operation, the motor drives the impeller to rotate at high speed, drawing water from the inlet chamber into the flow chamber and out through the outlet. However, the water contains a certain proportion of impurities, such as silt. This silt, flowing at high speed with the water, impacts the closed impeller with tremendous force, potentially causing it to puncture and rendering the pump unusable, thus reducing its lifespan. Furthermore, the flow cross-sectional area is uniform throughout the flow chamber, meaning the water velocity does not decrease as it enters. This allows impurities like silt to maintain a high velocity and significant impact force, which can damage the outer and inner casings and the check valve, further shortening the pump's lifespan. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a sand-resistant submersible pump. The technical problem solved is how to improve the sand-resistant capability and service life of the submersible pump.

[0006] The objective of this invention can be achieved through the following technical solution: A sand-resistant submersible pump, comprising a housing having an inlet chamber and an outlet, a motor fixedly connected to the housing, and an impeller fixedly connected to the output shaft of the motor, wherein an annular water passage chamber is provided between the housing and the motor and communicates with the outlet, characterized in that a guide vane is fixedly connected in the inlet chamber, the impeller is located at the middle of the guide vane, both the impeller and the guide vane are made of elastic material, and a plurality of first water passage holes are spaced apart along the circumferential edge of the guide vane, the inlet chamber is connected to the water passage chamber through the first water passage holes, and the sum of the cross-sectional areas of all the first water passage holes is less than the cross-sectional area of ​​the water passage chamber.

[0007] When the submersible pump operates, the impeller rotates, creating negative pressure in the inlet chamber. Water mixed with sediment flows into the inlet chamber from the outside. Both the impeller and guide vanes are made of elastic materials, meaning they can undergo elastic deformation. When impurities such as sediment impact the impeller and guide vanes, most of the impact force is dissipated, preventing damage to the impeller and guide vanes and improving the submersible pump's sand resistance and service life. Subsequently, the water mixed with sediment enters the through-flow chamber through the first water passage. The sum of the cross-sectional areas of the first water passage is less than the cross-sectional area of ​​the through-flow chamber, significantly reducing the flow velocity of the water entering the through-flow chamber. This reduces the velocity of the sediment, greatly decreasing the impact force of the sediment on the casing and motor, preventing damage to these components, further improving the submersible pump's sand resistance and service life.

[0008] In the aforementioned anti-sand submersible pump, the outer casing includes a housing and a support. The support is fixedly connected to one end of the housing, and the other end of the housing has a water outlet. The motor is fixedly connected to the inner end of the support, and the motor is located within the housing, with a water passage cavity between the motor and the housing. The outer end of the support has a water inlet cavity, and the guide vane is embedded and fixed in the outer end of the support. A plurality of second water passage holes are spaced apart along the circumferential edge of the support. The first and second water passage holes are arranged in a one-to-one correspondence. The water inlet cavity communicates with the water passage cavity through the first and second water passage holes. The motor is first fixedly connected to the support, integrated into one unit, and then installed into the housing, making the submersible pump easy to assemble. The water inlet cavity is formed at the outer end of the support, and the support supports the guide vane, demonstrating a reasonable design.

[0009] In the aforementioned sand-resistant submersible pump, the guide vane is annular, and the pump also includes an annular bottom cover made of elastic material. The bottom cover is fixed between the support and the guide vane, with its circumferential edge abutting against the edge of the inner ring of the guide vane. The output shaft of the motor passes through the bottom cover. The elastic bottom cover can absorb the impact of mud and sand. The bottom cover, in conjunction with the guide vane, prevents mud and sand from impacting the support, avoiding damage to the support, improving the submersible pump's sand resistance, and extending its service life.

[0010] In the aforementioned sand-resistant submersible pump, the outer casing further includes an annular inlet plate fixed to the outer end of the support. An annular pump cover made of elastic material is pressed and fixed between the guide vane and the inlet plate. The pump cover covers the outer end of the guide vane, and the inner ring of the pump cover encloses the edge of the inner ring of the inlet plate. The center of the pump cover is an inlet that communicates with the inlet chamber. The pump cover is elastic, which can absorb the impact of mud and sand. The water flow in the inlet chamber only flows between the guide vane, the bottom cover, and the pump cover, and does not come into contact with other components of the submersible pump except for the impeller. This makes other components of the submersible pump less prone to damage, improves the sand resistance of the submersible pump, and extends the service life of the submersible pump.

[0011] In the aforementioned anti-sand submersible pump, the inner edge of the inlet plate has several through holes, and the pump cover is integrated with the inlet plate by injection molding, with the pump cover partially embedded in the through holes. This structure integrates the inlet plate and pump cover into a single unit, resulting in high robustness and easy assembly.

[0012] In the aforementioned sand-resistant submersible pump, the outer circumferential edge of the support frame has several spaced-apart support plates. The guide vane is embedded in the space enclosed by the support plates, and the support plates abut against the outer circumferential wall of the guide vane. The support plates provide support, but do not fully support the outer circumferential wall of the guide vane, ensuring that the guide vane has sufficient strength and elasticity. This allows the guide vane to bulge and deform towards the gap between adjacent support plates, buffering the impact of mud and sand, making the guide vane less prone to damage, improving the sand resistance of the submersible pump, and extending the service life of the submersible pump.

[0013] In the aforementioned anti-sand submersible pump, the guide vane has several flow channels along its circumferential edge. The first water passage is located at the end of each flow channel and is connected to it. The flow channels allow the guide vane to direct the water flow in a predetermined direction, thus improving the pump's efficiency.

[0014] In the aforementioned anti-sand submersible pump, the sum of the cross-sectional areas of all the first water passages is 1 / 10 to 1 / 30 of the cross-sectional area of ​​the water passage cavity. This structure allows the flow velocity of water entering the water passage cavity to be reduced instantly, decreasing the flow velocity of sediment, reducing sediment impact, improving the submersible pump's anti-sand capability, and extending its service life.

[0015] In the aforementioned sand-resistant submersible pump, the other end of the casing has an inclined connecting surface with a water outlet. A water outlet connector is detachably fixed to the connecting surface and communicates with the water outlet. The central axis of the water outlet channel in the water outlet connector forms an acute angle with the central axis of the water outlet. This structure allows the orientation of the water outlet connector to be changed simply by rotating and then fixing it, enabling the submersible pump to be connected to different pipelines and improving its versatility.

[0016] In the aforementioned sand-resistant submersible pump, the impeller, guide vanes, bottom cover, and pump cover are made of elastic rubber or elastic plastic material. This structure gives the impeller, guide vanes, bottom cover, and pump cover a certain degree of elasticity. When impacted by impurities such as mud and sand, the impeller, guide vanes, bottom cover, and pump cover deform to buffer and relieve force, reducing the impact force of impurities such as mud and sand, making the impeller, guide vanes, bottom cover, and pump cover less prone to damage, and improving the service life of the submersible pump.

[0017] Compared with the prior art, the sand-resistant submersible pump provided by the present invention has the following advantages:

[0018] 1. The water flow in the inlet chamber of this submersible pump only flows between the guide vanes, bottom cover, and pump cover. Except for the impeller, the water flow does not come into contact with other components in the inlet chamber of the submersible pump. The impeller, guide vanes, bottom cover, and pump cover can all undergo elastic deformation to relieve the pressure of mud and sand without damage, thereby improving the submersible pump's sand resistance and service life.

[0019] 2. This submersible pump, by setting a first water passage and a second water passage, changes the cross-sectional area of ​​the water flow, which greatly reduces the flow velocity of the water entering the water passage chamber, thereby reducing the flow velocity of the sediment. This significantly reduces the impact force of the sediment, reduces the impact of the sediment on the casing and motor, prevents damage to the casing and motor, improves the submersible pump's sand resistance, and extends the service life of the submersible pump. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this submersible pump.

[0021] Figure 2 This is a cross-sectional view of the overall structure of this submersible pump.

[0022] Figure 3This is an exploded view of the overall structure of this submersible pump.

[0023] Figure 4 This is a schematic diagram of the structure of the water inlet chamber of this submersible pump.

[0024] Figure 5 This is a schematic diagram showing the connection between the inlet chamber and the water passage of this submersible pump.

[0025] In the diagram, 1. Outer shell; 11. Inlet chamber; 12. Outlet; 13. Shell; 14. Bracket; 141. Second water passage hole; 142. Support plate; 15. Inlet plate; 151. Through hole; 16. Connecting surface; 2. Motor; 21. Output shaft; 3. Impeller; 4. Water passage chamber; 5. Guide vane; 51. First water passage hole; 52. Flow guide channel; 6. Bottom cover; 7. Pump cover; 71. Inlet; 8. Outlet connector; 81. Outlet channel. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figure 1 , Figure 2 , Figure 3 As shown, this anti-sand submersible pump includes a casing 1, a motor 2, an impeller 3, a guide vane 5, a bottom cover 6, and a pump cover 7. In this embodiment, the guide vane 5 is made of elastic rubber material, and the impeller 3, bottom cover 6, and pump cover 7 are made of elastic plastic material. In actual production, the guide vane 5 can be made of elastic plastic material, and the impeller 3, bottom cover 6, and pump cover 7 can be made of elastic rubber material.

[0028] The outer casing 1 includes a housing 13, a bracket 14 and a water inlet plate 15. The bracket 14 is fixed to one end of the housing 13 by a threaded connection. The motor 2 is fixed to the inner end of the bracket 14. The motor 2 is located in the housing 13 and there is an annular water passage cavity 4 between the motor 2 and the housing 13. The water passage cavity 4 is connected to the water outlet 12.

[0029] The guide vane 5 is annular, and the outer end of the support 14 has a water inlet cavity 11. In this embodiment, as shown... Figure 4As shown, the bracket 14 has three spaced-apart support plates 142 at its outer circumferential edge. The guide vane 5 is embedded in the space enclosed by the support plates 142, and the support plates 142 abut against the outer circumferential wall of the guide vane 5. In actual production, the number of support plates 142 can be four or six. In this embodiment, the guide vane 5 has three flow channels 52 at its circumferential edge, and three first water holes 51 are spaced-apart at its circumferential edge. The first water holes 51 are located at the ends of the flow channels 52 and are connected to the flow channels 52. Three second water holes 141 are spaced-apart at the circumferential edge of the bracket 14. The first water holes 51 and the second water holes 141 are arranged in a one-to-one correspondence. Figure 5 As shown, the water inlet chamber 11 is connected to the water passage chamber 4 through the first water passage hole 51 and the second water passage hole 141. In actual production, the number of the guide channel 52, the first water passage hole 51 and the second water passage hole 141 can be four or six.

[0030] The sum of the cross-sectional areas of all the first water passages 51 is less than the cross-sectional area of ​​the water passage cavity 4. In this embodiment, the sum of the cross-sectional areas of all the first water passages 51 is 1 / 20 of the cross-sectional area of ​​the water passage cavity 4. In actual production, the sum of the cross-sectional areas of all the first water passages 51 can be 1 / 10 or 1 / 30 of the cross-sectional area of ​​the water passage cavity 4.

[0031] The bottom cover 6 is made of elastic material and is annular. The bottom cover 6 is fixed between the bracket 14 and the guide vane 5. The circumferential edge of the bottom cover 6 abuts against the edge of the inner ring of the guide vane 5. The output shaft 21 of the motor 2 passes through the bottom cover 6. An impeller 3 is fixedly connected to the output shaft 21 of the motor 2. The impeller 3 is located in the middle of the guide vane 5. The water inlet plate 15 is fixed to the outer end of the bracket 14 and is annular. An annular pump cover 7 made of elastic material is pressed and fixed between the guide vane 5 and the water inlet plate 15. The pump cover 7 covers the outer end of the guide vane 5. The inner ring of the pump cover 7 covers the edge of the inner ring of the water inlet plate 15. The pump cover 7 is integrated with the water inlet plate 15 by injection molding. The pump cover 7 is partially embedded in the through hole 151. The center of the pump cover 7 is the water inlet 71 connected to the water inlet chamber 11. In this embodiment, the inner edge of the water inlet plate 15 has twenty-four through holes 151. In actual production, the number of through holes 151 can be ten or thirty-two.

[0032] The other end of the housing 13 has an inclined connecting surface 16, in which there is a water outlet 12. A water outlet connector 8 is detachably fixed to the connecting surface 16. The water outlet connector 8 is connected to the water outlet 12. The central axis of the water outlet channel 81 in the water outlet connector 8 and the central axis of the water outlet 12 form an acute angle.

[0033] When the submersible pump is working, the impeller 3 rotates, creating a negative pressure in the inlet chamber 11. Water mixed with mud and sand enters the inlet chamber 11 from the inlet 71. Under the action of the impeller 3 rotation, the water flows along the guide channel 52 and then through the first water passage 51 and the second water passage 141 into the water passage chamber 4, and then is discharged through the outlet 12 and the outlet connector 8.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0035] Although this document frequently uses terms such as outer casing 1, water inlet chamber 11, water outlet 12, housing 13, bracket 14, second water passage hole 141, support plate 142, water inlet plate 15, through hole 151, connecting surface 16, motor 2, output shaft 21, impeller 3, water passage chamber 4, guide vane 5, first water passage hole 51, guide channel 52, bottom cover 6, pump cover 7, water inlet 71, water outlet connector 8, and water outlet channel 81, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A sand-resistant submersible pump, comprising a housing (1) having an inlet chamber (11) and an outlet (12), a motor (2) fixedly connected to the housing (1), and an impeller (3) fixedly connected to the output shaft (21) of the motor (2), wherein an annular water passage chamber (4) is provided between the housing (1) and the motor (2) and communicates with the outlet (12), characterized in that, A guide vane (5) is fixedly connected to the water inlet cavity (11). The impeller (3) is located in the middle of the guide vane (5). Both the impeller (3) and the guide vane (5) are made of elastic material. Several first water passage holes (51) are spaced apart on the circumferential edge of the guide vane (5). The water inlet cavity (11) is connected to the water passage cavity (4) through the first water passage holes (51). The sum of the cross-sectional areas of all the first water passage holes (51) is less than that of the water passage cavity (4). The cross-sectional area of ​​the flow path is given by the outer shell (1), which includes a support (14). The guide vane (5) is embedded and fixed in the outer end of the support (14). A plurality of second water passage holes (141) are provided at intervals along the circumferential edge of the support (14). The first water passage hole (51) and the second water passage hole (141) are provided in a one-to-one correspondence. The water inlet chamber (11) is connected to the water passage chamber (4) through the first water passage hole (51) and the second water passage hole (141). The guide vane (5) is annular, and the submersible pump also includes an annular bottom cover (6) made of elastic material. The bottom cover (6) is fixed between the bracket (14) and the guide vane (5). The circumferential edge of the bottom cover (6) abuts against the edge of the inner ring of the guide vane (5). The output shaft (21) of the motor (2) passes through the bottom cover (6). The housing (1) also includes an annular water inlet plate (15) fixed to the outer end of the bracket (14). The guide vane (5) and The inlet plates (15) are pressed together with a ring-shaped pump cover (7) made of elastic material. The pump cover (7) covers the outer end of the guide vane (5). The inner ring of the pump cover (7) covers the edge of the inner ring of the inlet plate (15). The center of the pump cover (7) is an inlet (71) connected to the inlet chamber (11). The impeller (3), the guide vane (5), the bottom cover (6) and the pump cover (7) are made of elastic rubber material or elastic plastic material.

2. The sand-resistant submersible pump according to claim 1, characterized in that, The outer casing (1) includes a housing (13), the bracket (14) is fixed to one end of the housing (13), the other end of the housing (13) has the water outlet (12), the motor (2) is fixed to the inner end of the bracket (14), the motor (2) is located in the housing (13) and there is a water passage cavity (4) between the motor (2) and the housing (13), and the outer end of the bracket (14) has the water inlet cavity (11).

3. A sand-resistant submersible pump according to claim 1 or 2, characterized in that, The inner edge of the water inlet plate (15) has several through holes (151). The pump cover (7) is integrated with the water inlet plate (15) by injection molding. The pump cover (7) is partially embedded in the through holes (151).

4. A sand-resistant submersible pump according to claim 1 or 2, characterized in that, The bracket (14) has several spaced support plates (142) at its outer circumferential edge. The guide vane (5) is embedded in the space enclosed by the support plates (142), and the support plates (142) abut against the outer circumferential wall of the guide vane (5).

5. A sand-resistant submersible pump according to claim 1 or 2, characterized in that, The guide vane (5) has several flow channels (52) along its circumferential edge. The first water passage (51) is located at the end of the flow channel (52) and is connected to the flow channel (52).

6. A sand-resistant submersible pump according to claim 1 or 2, characterized in that, The sum of the cross-sectional areas of all the first water passages (51) is 1 / 10 to 1 / 30 of the cross-sectional area of ​​the water passage cavity (4).

7. A sand-resistant submersible pump according to claim 2, characterized in that, The other end of the housing (13) has an inclined connecting surface (16), the connecting surface (16) has the water outlet (12), and a water outlet connector (8) is detachably fixed on the connecting surface (16). The water outlet connector (8) is connected to the water outlet (12), and the central axis of the water outlet channel (81) in the water outlet connector (8) and the central axis of the water outlet (12) have an acute angle.

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