Submersible sewage pump with quick-release impeller structure

Abstract

The utility model provides a kind of submersible sewage pump with quick detachable impeller structure belongs to pump technical field.It solves the problem that the existing submersible sewage pump needs to disassemble many upper components to replace impeller, and the operation is complicated and the precision structure is easily damaged.The pump housing bottom of the present submersible sewage pump is provided with an installation through-hole with a diameter larger than the outer diameter of the impeller;one stabilizing member is detachably connected to the lower end of the through-hole by bolts, with a sealing ring therebetween, and the stabilizing member is provided with a filter screen positioned by the engagement of positioning protrusions and grooves;the fixing bolts simultaneously penetrate the filter screen and the stabilizing member and are connected with the pump housing, to realize synchronous compression.The utility model realizes the direct installation and disassembly of impeller from the bottom mounting hole, without the need to disassemble the upper components such as motor, oil cylinder, bearing and shaft seal during maintenance, with the advantages of simple operation, time and labor saving, avoidance of damage to precision components and low maintenance cost.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, and specifically refers to a submersible sewage pump with a quick-release impeller structure. Background Technology

[0002] Sewage pumps are critical equipment used to transport sewage or wastewater containing impurities such as solid particles and fibers. They are commonly found in municipal drainage, sewage treatment plants, industrial circulating water systems, and construction projects. Because sewage often contains various debris such as plastic bags, leaves, fiber clumps, and silt, ineffective filtration can easily lead to blockages in the pump's flow channels, impeller wear, or entanglement, affecting the pump's normal operating efficiency and service life. Therefore, a filtration device is typically installed at the inlet of the sewage pump to intercept larger impurities and protect the pump's internal structure.

[0003] Submersible sewage pumps, as a commonly used type of sewage lifting equipment, have structural designs that directly affect their reliability, ease of maintenance, and service life. While existing submersible sewage pumps have seen some improvements in sealing, cooling, and bearing support, the installation and replacement of the impeller still present many inconveniences. For example, in a submersible sewage pump disclosed in CN118757410A, the impeller is fixedly connected to the shaft via a flat key and axially locked at the bottom of the impeller by an impeller nut. Although this structure is robust, in actual maintenance, replacing or cleaning the impeller requires disassembling multiple components such as the pump body, seals, and bearing assemblies sequentially. This operation is complex, time-consuming, and prone to damaging the mechanical seal or bearings during disassembly, affecting the overall sealing performance and operational stability of the pump. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a submersible sewage pump with a quick-release impeller structure. The technical problem this invention aims to solve is: how to overcome the difficulties in disassembling the impeller and the cumbersome maintenance process of existing submersible sewage pumps, and to provide a solution that allows for quick impeller disassembly and assembly without disassembling major components of the pump body, such as the hydraulic cylinder, seals, and bearings. This simplifies maintenance operations, reduces maintenance costs, and avoids damage to core seals and transmission components during maintenance.

[0005] The objective of this utility model can be achieved through the following technical solution: A submersible sewage pump with a quick-release impeller structure includes a motor unit and a pump unit connected to the motor unit; the pump unit includes a pump casing and an impeller housed within the pump casing cavity; the motor unit has an output shaft that extends into the pump casing to drive the impeller to rotate; a mounting base is provided at the upper end of the pump casing, and a bearing assembly and a first seal are assembled within the mounting base, with the output shaft passing through the bearing assembly and the first seal in sequence; the impeller is fixedly mounted at the end of the output shaft; a mounting through hole is provided at the bottom of the pump casing, through which the impeller can be inserted into or removed from the pump casing cavity; a stabilizing member is detachably connected to one end of the pump casing at the mounting through hole, and the stabilizing member has a water inlet hole communicating with the mounting through hole.

[0006] Furthermore, the upper end of the stabilizing member and the pump housing are sealed together by a sealing ring; the upper end of the stabilizing member has an upwardly extending protrusion, the outer peripheral surface of the protrusion is adapted to the inner peripheral surface of the mounting through hole of the pump housing and forms abutment fit; the lower end of the protrusion extends radially inward to form an annular partition, and the water inlet is opened on the partition.

[0007] Furthermore, the upper end of the stabilizing member is simultaneously fixedly connected to the filter screen and fastened to the pump housing by at least two fixing bolts; the fixing bolts pass through the filter screen and the stabilizing member in sequence, and are finally threadedly connected to the pump housing.

[0008] Furthermore, the lower inner peripheral wall of the stabilizer is provided with at least two positioning grooves, and the side wall of the filter screen protrudes outward to form a positioning protrusion that matches the positioning groove; the filter screen can be axially assembled from the lower end of the stabilizer, and the positioning protrusion is engaged in the corresponding positioning groove to achieve circumferential positioning of the filter screen in the stabilizer; the middle part of the stabilizer has a water inlet opposite to the filter screen.

[0009] Furthermore, a fixed ring extends axially upward from the upper end of the pump casing, and the fixed ring is coaxially arranged with the mounting base; a hydraulic cylinder is installed above the pump casing, and the lower end face of the hydraulic cylinder abuts against the upper end face of the pump casing; a second sealing element is provided between the inner peripheral wall of the hydraulic cylinder and the outer peripheral wall of the fixed ring.

[0010] Furthermore, the inner peripheral wall of the cylinder is provided with a stepped groove, and the cross-section of the second sealing element is Z-shaped and is embedded in the stepped groove to achieve a static seal between the cylinder and the fixed ring.

[0011] Compared with existing technologies, the technical advantages of this utility model are as follows: 1. By designing the bottom of the pump casing as an openable structure, maintenance personnel only need to remove the stabilizing component from the bottom of the pump body to directly remove the impeller for cleaning, repair, or replacement. The entire process does not require touching or disassembling the upper cylinder, mechanical seal, and bearing assembly of the pump body, greatly simplifying the operation process, shortening maintenance time, and improving the convenience of equipment maintenance. 2. By avoiding frequent disassembly of the upper seal and bearing components, the risk of damage to the precision mechanical seal and bearings due to improper operation during maintenance is significantly reduced. This helps to maintain the sealing performance and transmission accuracy of the entire machine for a long time, extends the service life of core components, and thus improves the overall operational reliability and stability of the submersible sewage pump. 3. The stabilizing component and the pump casing are fitted with a sealing ring, and the protrusion and the mounting through hole abut against each other, ensuring the sealing strength and structural rigidity of the connection at the bottom of the pump body. At the same time, a unique Z-shaped cross-section second seal is used between the cylinder and the pump casing to achieve a reliable static seal, effectively preventing media leakage and external water from entering the oil chamber, ensuring long-term stable operation of the equipment under harsh working conditions. IV. The filter screen achieves circumferential positioning through the engagement of the positioning protrusion and the positioning groove on the stabilizing component, and is then locked to the stabilizing component and pump casing by the same set of fixing bolts. This makes the installation and removal of the filter screen equally convenient, with accurate positioning and a firm connection, avoiding shaking or abnormal noise caused by water flow impact during pump operation. V. This utility model significantly reduces the manpower and time costs required for maintenance. For sewage treatment applications that require frequent impeller cleaning, it greatly shortens equipment maintenance time, ensures the continuity of production or drainage operations, and brings significant economic benefits to users. Attached Figure Description

[0012] Figure 1 This is a perspective view of the utility model.

[0013] Figure 2 This is a cross-sectional view of the present invention.

[0014] Figure 3 This is a cross-sectional view of the pump casing of this utility model.

[0015] Figure 4 This is a perspective view of the stabilizing component of this utility model.

[0016] Figure 5 This is an exploded view of this utility model.

[0017] Drawing number markings: 1. Motor unit; 11. Output shaft; 2. Pump unit; 21. Pump housing; 211. Mounting base; 212. Mounting through hole; 213. Fixing ring; 22. Impeller; 3. Hydraulic cylinder; 31. Stepped groove; 32. Second seal; 4. Bearing assembly; 5. First seal; 6. Stabilizing component; 61. Protrusion; 62. Partition; 63. Water inlet; 64. Positioning groove; 65. Water outlet; 7. Fixing bolt; 8. Sealing ring; 9. Filter screen; 91. Positioning protrusion. Detailed Implementation

[0018] 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.

[0019] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] according to Figures 1 to 5 As shown: The submersible sewage pump with a quick-release impeller structure provided by this utility model is mainly composed of two parts: motor unit 1 and pump unit 2.

[0021] The motor unit 1 is located at the top of the machine, and its lower end is connected to the pump housing 21 of the pump unit 2 by bolts. The motor unit 1 contains a rotor, a stator, and an output shaft 11. The upper end of the pump housing 21 is provided with the mounting base 211, and the lower part of the output shaft 11 passes through the oil cylinder 3 and the mounting base 211 at the upper end of the pump housing 21 in sequence.

[0022] The mounting base 211 is equipped with a bearing assembly 4 and a first seal 5 sequentially from top to bottom. The output shaft 11 passes precisely through the inner ring of the bearing assembly 4 and the first seal 5, and is radially supported by the bearing assembly 4 to ensure smooth rotation. The end of the output shaft 11 is fixedly mounted with an impeller 22 by a flat key or spline and a nut, thereby transmitting the rotational power of the motor to the impeller 22. The core improvement of this utility model lies in the bottom structure of the pump unit 2. A sufficiently large mounting through hole 212 is provided at the bottom of the pump housing 21. The diameter of the mounting through hole 212 is designed to be larger than the maximum outer diameter of the impeller 22, so that the impeller 22 can be directly inserted into or completely removed from the cavity of the pump housing 21 through the mounting through hole 212 without disassembling any components on the upper part of the pump housing 21.

[0023] The stabilizing member 6 is detachably connected to the lower end of the mounting through hole 212 of the pump housing 21 by multiple fixing bolts 7. To ensure a seal, a sealing ring 8 is provided between the upper end face of the stabilizing member 6 and the bottom surface of the pump housing 21. Specifically, the upper end of the stabilizing member 6 has an upwardly extending protrusion 61, the outer peripheral surface of which is adapted to the inner peripheral surface of the mounting through hole 212 of the pump housing 21 and forms a tight abutment fit, which not only provides initial positioning but also enhances the connection rigidity. The lower end of the protrusion 61 extends radially inward to form an annular baffle 62, which has multiple water inlet holes 63. Water flows into the pump chamber through these water inlet holes 63. The diameter of the water inlet holes 63 is smaller than the outer diameter of the impeller 22 to prevent the water flow from directly impacting the impeller 22. The middle part of the stabilizing member 6 has a water outlet 65 opposite to the filter screen 9.

[0024] The filter screen 9 is installed inside the stabilizer 6. To achieve quick positioning and installation of the filter screen 9, at least two positioning grooves 64 are provided on the lower inner circumferential wall of the stabilizer 6. Correspondingly, a positioning protrusion 91 that matches the positioning groove 64 is formed outwardly on the side wall of the filter screen 9. During installation, the filter screen 9 is pushed axially upward from the lower end of the stabilizer 6, so that the positioning protrusion 91 is accurately engaged in the corresponding positioning groove 64, thereby achieving circumferential positioning of the filter screen 9 within the stabilizer 6 and preventing its rotation. The fixing bolts 7 pass sequentially through the flange edge of the upper part of the filter screen 9, the mounting hole at the upper end of the stabilizer 6, and finally are threadedly connected to the bottom of the pump housing 21. Therefore, tightening this set of fixing bolts 7 can simultaneously achieve the compression and fixing of the filter screen 9, the tight connection between the stabilizer 6 and the pump housing 21, and the compression sealing of the sealing ring 8. The structure is very compact and extremely convenient to assemble and disassemble.

[0025] At the upper end of the pump casing 21, a fixed ring 213 extends axially upward, and the fixed ring 213 is coaxially arranged with the mounting base 211. A hydraulic cylinder 3 is installed above the pump casing 21, and the lower end face of the hydraulic cylinder 3 abuts against the upper end face of the pump casing 21. To achieve a reliable seal between the hydraulic cylinder 3 and the pump casing 21, a stepped groove 31 is machined on the inner peripheral wall of the hydraulic cylinder 3, and a second sealing element 32 with a Z-shaped cross-section is embedded in the stepped groove 31. When the hydraulic cylinder 3 is fixed to the motor unit 1 or the pump casing 21 by bolts, the Z-shaped second sealing element 32 is compressed between the outer peripheral surface of the fixed ring 213 and the stepped groove 31, forming an excellent static seal, effectively preventing external media from entering the oil chamber and the pump body.

[0026] During assembly: First, press the bearing assembly 4 and the first seal 5 into the mounting base 211 of the pump housing 21. Pass the output shaft 11 through the above components and fix the impeller 22 to the end of the output shaft 11 with a nut. Invert the pump housing 21 assembly with the impeller 22 assembled, and insert the sealing ring 8, the retaining member 6, and the filter screen 9 in sequence through the mounting through hole 212 at the bottom. Then, use the fixing bolts 7 to fasten the three together to the bottom of the pump housing 21.

[0027] When cleaning or replacing the impeller 22: Remove the fixing bolts 7. Then remove the filter screen 9 and the retaining member 6 in sequence. At this point, the impeller 22 is fully exposed at the mounting hole 212 at the bottom of the pump casing 21. Unscrew the impeller nut to remove the impeller 22 directly from the bottom for cleaning or replacement. The entire process does not require disassembling the upper core precision components such as the cylinder 3, bearing assembly 4, and first seal 5, resulting in extremely high maintenance efficiency.

[0028] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A submersible sewage pump with a quick-release impeller structure, comprising a motor unit (1) and a pump unit (2) connected to the motor unit (1); the pump unit (2) includes a pump casing (21) and an impeller (22) housed within the chamber of the pump casing (21); the motor unit (1) has an output shaft (11) extending into the pump casing (21) to drive the impeller (22) to rotate; characterized in that: The upper end of the pump housing (21) is provided with a mounting base (211), and a bearing assembly (4) and a first seal (5) are assembled inside the mounting base (211). The output shaft (11) passes through the bearing assembly (4) and the first seal (5) in sequence. The impeller (22) is fixedly installed at the end of the output shaft (11). The bottom of the pump housing (21) is provided with a mounting through hole (212), through which the impeller (22) can be inserted into or removed from the cavity of the pump housing (21). A stabilizing member (6) is detachably connected to one end of the mounting through hole (212) of the pump housing (21). The stabilizing member (6) is provided with a water inlet hole (63) communicating with the mounting through hole (212).

2. A submersible sewage pump with a quick-release impeller structure according to claim 1, characterized in that: The upper end of the stabilizing member (6) is sealed to the pump housing (21) by a sealing ring (8); the upper end of the stabilizing member (6) has an upwardly extending protrusion (61), the outer peripheral surface of the protrusion (61) is adapted to the inner peripheral surface of the mounting through hole (212) of the pump housing (21) and forms abutment fit; the lower end of the protrusion (61) extends radially inward to form an annular partition (62), and the water inlet (63) is opened on the partition (62).

3. A submersible sewage pump with a quick-release impeller structure according to claim 2, characterized in that: The upper end of the stabilizer (6) is simultaneously fixedly connected to the filter screen (9) and fastened to the pump housing (21) by at least two fixing bolts (7); the fixing bolts (7) pass through the filter screen (9) and the stabilizer (6) in sequence, and are finally threadedly connected to the pump housing (21).

4. A submersible sewage pump with a quick-release impeller structure according to claim 3, characterized in that: The lower inner peripheral wall of the stabilizer (6) is provided with at least two positioning grooves (64), and the side wall of the filter screen (9) protrudes outward to form a positioning protrusion (91) that matches the positioning groove (64); the filter screen (9) can be axially assembled from the lower end of the stabilizer (6) and the positioning protrusion (91) can be inserted into the corresponding positioning groove (64) to achieve circumferential positioning of the filter screen (9) in the stabilizer (6); the middle part of the stabilizer (6) has a water outlet (65) opposite to the filter screen (9).

5. A submersible sewage pump with a quick-release impeller structure according to any one of claims 1 to 4, characterized in that: A fixed ring (213) extends axially upward from the upper end of the pump housing (21), and the fixed ring (213) is coaxially arranged with the mounting base (211); a cylinder (3) is installed above the pump housing (21), and the lower end face of the cylinder (3) abuts against the upper end face of the pump housing (21); a second sealing element (32) is provided between the inner peripheral wall of the cylinder (3) and the outer peripheral wall of the fixed ring (213).

6. A submersible sewage pump with a quick-release impeller structure according to claim 5, characterized in that: The inner peripheral wall of the oil cylinder (3) is provided with a stepped groove (31), and the cross-section of the second sealing member (32) is Z-shaped and is embedded in the stepped groove (31) to achieve static sealing between the oil cylinder (3) and the fixed ring (213).

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