Anti-blocking submersible sewage pump

Abstract

The utility model discloses an anti-blocking submersible sewage pump, and belongs to the technical field of fluid machinery. The pump comprises a pump body, a pump shaft, a semi-open impeller and a stirring wheel, a stirring wheel shaft penetrates through an impeller center hole to be fixed to the pump shaft, and the stirring wheel is located on the outer side of an impeller inlet to stir sediment. A front cover plate is arranged on the inlet side of the impeller in the pump body, and a gap adjusting mechanism capable of adjusting the axial position of the front cover plate is arranged on the pump body so as to accurately control the working gap between the front cover plate and the impeller. And after the clearance is adjusted, the pump body and the front cover plate are locked through a fixing bolt. The pump is further provided with a lock washer for preventing the impeller from loosening and a stable supporting structure composed of a supporting frame and a rubber bearing. The anti-blocking sewage pump integrates active anti-blocking, adjustable gap and stable operation, and the passing capacity, the operation efficiency and the maintenance convenience of the sewage pump in a solid-containing and easy-to-deposit medium are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of fluid machinery technology, specifically to an anti-clogging submersible sewage pump. Background Technology

[0002] Submersible sewage pumps are key equipment in sewage treatment, municipal drainage, and industrial wastewater discharge, and are widely used to transport media containing solid particles, fibrous impurities, or easily deposited substances. Traditional submersible sewage pumps typically use closed impellers with narrow flow channels. When transporting sewage containing solids, the impeller flow channels are prone to blockage, leading to a sharp drop in pump efficiency or even complete failure to operate.

[0003] To improve pump flow capacity and reduce the risk of clogging, existing technologies have developed sewage pumps using open or semi-open impellers. These impellers, by eliminating the front cover or retaining only a partial cover, increase the space for particle passage, thus alleviating clogging to some extent. However, for sewage that easily settles or contains long fibers, solid particles can still easily accumulate near the pump's suction inlet, affecting the normal intake of the medium and not fundamentally solving the risk of inlet clogging.

[0004] To address sedimentation issues, some existing technologies incorporate independent agitation or cutting devices near the pump's suction inlet. For example, one approach involves placing the agitator at the end of the pump shaft extending below the suction inlet, agitating the sediment at the bottom of the tank through rotation. However, such agitators are typically installed separately from the main impeller, resulting in a relatively independent structure that increases axial dimensions and structural complexity. Furthermore, the agitation area may be separated from the pump's main suction channel, hindering the coordinated efficiency of agitation and suction. In addition, the operating clearance between the semi-open impeller and the pump body increases with long-term wear, leading to increased internal leakage and decreased pump efficiency. Traditional pump structures often struggle to easily adjust and compensate for this clearance, resulting in poor maintainability. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a novel submersible sewage pump that integrates the anti-settling stirring function with the large channel advantage of a semi-open impeller in a compact design, while also having the ability to adjust the operating gap, thereby maintaining high efficiency, high reliability and strong anti-clogging ability during long-term operation.

[0006] The technical solution adopted by this utility model is as follows: a clog-proof submersible sewage pump, including a pump body, a pump shaft, a semi-open impeller set on the pump shaft, and a stirring wheel;

[0007] The stirring wheel has a stirring wheel shaft, which passes through the central hole of the semi-open impeller and is fixedly connected to the pump shaft. The stirring wheel is located outside the inlet of the semi-open impeller.

[0008] A front cover plate is provided on the inlet side of the semi-open impeller inside the pump body. A clearance adjustment mechanism is provided on the pump body for adjusting the axial position of the front cover plate to change the working clearance between the front cover plate and the semi-open impeller.

[0009] After the gap adjustment mechanism is adjusted, the pump body is fixedly connected to the front cover plate by at least one fixing bolt that passes through the pump body and is screwed into the front cover plate.

[0010] Furthermore, the gap adjustment mechanism includes at least one adjusting bolt that passes through the pump body axially, the inner end of the adjusting bolt abutting against the front cover plate; the front cover plate can be driven to move axially by rotating the adjusting bolt.

[0011] Furthermore, the adjusting bolt is equipped with a locking nut for locking the position of the adjusting bolt after the gap is adjusted to the correct position.

[0012] Furthermore, it also includes a retaining washer, which is sleeved on the agitator shaft and located between the agitator and the semi-open impeller; the two sides of the retaining washer are bent to lock onto the agitator, thereby preventing the semi-open impeller from loosening.

[0013] Furthermore, it also includes a support frame and a rubber bearing. The support frame is connected to the inner wall of the water inlet of the pump body, the rubber bearing is mounted on the support frame, and the stirring wheel shaft is rotatably supported in the rubber bearing.

[0014] Furthermore, a filter screen is provided on the outside of the suction port of the pump body. The filter screen is sleeved on the outside of the stirring wheel and connected to the pump body.

[0015] The beneficial effects of this utility model are as follows:

[0016] (1) By placing the stirring wheel outside the inlet of the semi-open impeller, this utility model can actively and directly stir the sediment near the pump inlet to prevent the accumulation of solid particles. Combined with the large channel advantage of the semi-open impeller itself, it provides double protection for the smooth passage of large particles and fibrous debris, significantly reduces the risk of blockage, and ensures the efficient and continuous delivery of the medium.

[0017] (2) This utility model can precisely adjust and lock the working gap between the front cover plate and the semi-open impeller through a unique gap adjustment mechanism (adjusting bolt and locking nut); when the impeller wears and the gap increases and the efficiency decreases, the optimal gap can be restored on site without disassembling the core components, effectively compensating for wear, enabling the pump to operate in the high-efficiency range for a long time, and reducing maintenance difficulty and cost.

[0018] (3) The agitator shaft is radially supported by rubber bearings, which effectively suppresses vibration during high-speed rotation. At the same time, the agitator is locked with a retaining washer to prevent it from loosening under high speed or reverse impact, which improves the mechanical stability of pump operation, reduces component wear and failure, and extends the overall service life. The agitator shaft is directly connected to the pump shaft through the semi-open impeller center hole, which realizes a high degree of integration between the agitation function and the impeller fixing, eliminating the need for an independent agitation transmission structure, making the axial layout of the pump more compact and reducing the overall size and weight. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a partial enlarged view of the present invention.

[0021] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0022] In the diagram: 1. Pump shaft; 2. Semi-open impeller; 3. Pump body; 4. Filter screen; 5. Agitator wheel; 6. Front cover plate; 7. Fixing bolt; 8. Adjusting bolt; 9. Locking nut; 10. Support frame; 11. Rubber bearing; 12. Locking washer. Detailed Implementation

[0023] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0024] like Figures 1-3 As shown in the figure, the anti-clogging submersible sewage pump provided by this utility model embodiment is characterized by integrating multiple functions such as anti-settling stirring, adjustable blade tip clearance, and stable operation.

[0025] The sewage pump mainly includes a pump body 3, a pump shaft 1, a semi-open impeller 2, an agitator 5, and a front cover plate 6. The pump shaft 1 is driven by a submersible motor. The semi-open impeller 2 is fixedly installed on the pump shaft 1 by means of key connection or other methods, and rotates together with it to pump the medium.

[0026] To achieve active anti-clogging, this invention incorporates a dedicated stirring wheel 5. The stirring wheel 5 has a stirring wheel shaft that extends rearward from the pump inlet side and passes through the central hole of the semi-open impeller 2, achieving a fixed connection to the pump shaft 1 via threaded or keyed connections. The stirring wheel 5, the semi-open impeller 2, and the pump shaft 1 rotate synchronously. With the stirring wheel 5 located outside the inlet of the semi-open impeller 2, it can directly and effectively agitate sediment near the pump suction inlet, preventing solid particle accumulation and ensuring smooth suction.

[0027] On the inlet side of the semi-open impeller 2, a front cover plate 6 is provided inside the pump body 3. A critical working clearance is formed between the front cover plate 6 and the blade tips of the semi-open impeller 2. To compensate for operational wear and maintain pump efficiency over a long period, this invention includes a clearance adjustment mechanism. This mechanism includes at least one adjusting bolt 8 that passes through the pump body 3 along the pump axis. The inner end of the adjusting bolt 8 directly abuts against the back of the front cover plate 6. By rotating the adjusting bolt 8, the front cover plate 6 can be precisely driven to move along the pump axis, thereby changing the clearance between it and the semi-open impeller 2. When the clearance is adjusted to the optimal value, the position of the adjusting bolt 8 can be locked by tightening the locking nut 9 provided on the adjusting bolt 8 to prevent it from loosening. After the clearance adjustment is completed, at least one fixing bolt 7 that passes through the pump body 3 and screws into the front cover plate 6 is used to finally fasten the two together, ensuring the stability of the front cover plate 6 during operation.

[0028] This utility model includes a retaining washer 12. The retaining washer 12 is fitted onto the agitator shaft and located between the agitator 5 and the semi-open impeller 2. During assembly, the two sides of the retaining washer 12 are bent to make it fit tightly against or snap into the agitator shaft, thereby preventing the semi-open impeller 2 from loosening.

[0029] To enhance the radial stability of the stirring wheel 5 during operation and reduce vibration, this invention also includes a support frame 10 and a rubber bearing 11. The support frame 10 is connected to the inner wall of the water inlet bell of the pump body 3. The rubber bearing 11 is connected to the support frame 10. The corresponding shaft segment of the stirring wheel shaft is rotatably supported in the inner hole of the rubber bearing 11, thereby obtaining effective radial constraint.

[0030] A filter screen 4 is installed on the outermost side of the suction inlet of the pump body 3. The filter screen 4 is cylindrical or basket-shaped and is fitted over the outside of the agitator wheel 5. Its tail end is connected and fixed to the pump body 3 by bolts or clips. The filter screen 4 provides primary protection, preventing oversized debris from entering the pump and protecting the internal agitation and flow components.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A clog-resistant submersible sewage pump, comprising a pump body (3), a pump shaft (1), a semi-open impeller (2) mounted on the pump shaft (1), and an agitator (5), characterized in that: The stirring wheel (5) has a stirring wheel shaft, which passes through the center hole of the semi-open impeller (2) and is fixedly connected to the pump shaft (1). The stirring wheel (5) is located outside the inlet of the semi-open impeller (2). A front cover plate (6) is provided inside the pump body (3) on the inlet side of the semi-open impeller (2). A clearance adjustment mechanism is provided on the pump body (3) for adjusting the axial position of the front cover plate (6) to change the working clearance between the front cover plate (6) and the semi-open impeller (2). After the gap adjustment mechanism is adjusted, the pump body (3) and the front cover plate (6) are fixedly connected by at least one fixing bolt (7) that passes through the pump body (3) and screws into the front cover plate (6).

2. The anti-clogging submersible sewage pump as described in claim 1, characterized in that, The gap adjustment mechanism includes at least one adjusting bolt (8) that passes through the pump body (3) axially, and the inner end of the adjusting bolt (8) abuts against the front cover plate (6); the front cover plate (6) can be driven to move axially by rotating the adjusting bolt (8).

3. The anti-clogging submersible sewage pump as described in claim 2, characterized in that, The adjusting bolt (8) is equipped with a locking nut (9) for locking the position of the adjusting bolt (8) after the gap is adjusted to the correct position.

4. The anti-clogging submersible sewage pump as described in claim 1, characterized in that, It also includes a retaining washer (12), which is fitted on the agitator shaft and located between the agitator (5) and the semi-open impeller (2); the two sides of the retaining washer (12) are bent to lock onto the agitator (5) to prevent the semi-open impeller (2) from loosening.

5. The anti-clogging submersible sewage pump as described in claim 1, characterized in that, It also includes a support frame (10) and a rubber bearing (11). The support frame (10) is connected to the inner wall of the water inlet of the pump body (3). The rubber bearing (11) is mounted on the support frame (10). The stirring wheel shaft is rotatably supported in the rubber bearing (11).

6. The anti-clogging submersible sewage pump as described in claim 1, characterized in that, A filter screen (4) is provided on the outside of the suction port of the pump body (3). The filter screen (4) is sleeved on the outside of the stirring wheel (5) and connected to the pump body (3).

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