A sewage pump

Abstract

The utility model discloses a sewage pump, including the pump body, the water inlet end is provided with the water inlet end at the lower extreme of pump body, is provided with the filter sleeve adapter sleeve at water inlet end place through the thread cooperation, is provided with the filter core in filter sleeve adapter sleeve, is provided with the track on the water inlet end, is provided with the sliding block on the track, is provided with the positioning unit on the sliding block, the positioning unit has two positioning clamping arms, and the extrusion block is arranged at the lower extreme of two positioning clamping arms, and the extrusion cavity is formed between two extrusion blocks, and the positioning rod is provided with the water inlet end on filter sleeve adapter sleeve upper end, the utility model has the following advantages and effect: through setting positioning unit, can prevent filter sleeve adapter sleeve under the alternating load of intense vibration, hydraulic impact and frequent start -stop bring, relative to the slow reverse rotation of water inlet end, and further improve the connection stability between water inlet end and filter sleeve adapter sleeve, fundamentally eliminate the risk of falling.

Description

Technical Field

[0001] This utility model relates to a pump, and more particularly to a sewage pump. Background Technology

[0002] A sewage pump is a fluid transport device widely used in municipal sewage discharge, industrial wastewater treatment, building basement drainage, and agricultural irrigation drainage. Its core function is to effectively pump sewage or wastewater containing suspended solids such as particles, fibers, and impurities. A typical sewage pump structure mainly includes a pump body, impeller, drive motor, and inlet end located at the lower end of the pump body.

[0003] In existing technologies, the inlet end of a sewage pump is directly exposed to the sewage to be pumped, and its main function is to provide an inlet channel for sewage to enter the pump chamber. However, this design has a significant drawback: the inlet end typically does not integrate or have a filter sleeve structure. The shortcomings of this design are: Because the pump directly draws in the medium at the inlet end, lacking an effective physical barrier, it easily sucks in large, irregularly shaped, or entangled solid debris (such as stones, plastic sheeting, long fibers, hair, etc.). This debris enters the pump chamber directly without being filtered. These unfiltered debris easily become entangled on the impeller or get stuck in the narrow gap between the impeller and the pump body, causing impeller blockage or even jamming. This not only instantly interrupts the normal operation of the pump, affecting drainage efficiency, but can also damage the impeller or motor in severe cases. To solve these problems, existing technologies use a threaded filter sleeve at the inlet end to perform a filtering function.

[0004] However, in actual use, the unavoidable strong vibrations, hydraulic shocks, and alternating loads from frequent start-stop cycles of the sewage pump continuously act on the threaded connection. This dynamic load causes slight relative slippage between the threaded parts and gradually consumes the preload. As the preload decreases, the threaded part's ability to resist rotational loosening drops significantly. When the preload is reduced to an insufficient level to overcome the rotational torque generated by the working load, the self-locking function of the threaded connection fails, and the sleeve begins to slowly rotate in the opposite direction relative to the inlet end. With the loss of preload and the progress of fretting wear, not only is the thread strength weakened, increasing the risk of stripping, but the filter sleeve may also detach.

[0005] In summary, the existing technology relying on threaded connections to fix the filter sleeve inherently suffers from mechanical instability (easy loosening of preload and poor vibration resistance), which is significantly amplified under the harsh vibration and variable load conditions of sewage pumps. This exposes the filter sleeve to a significant risk of gradual loosening and eventual complete detachment. Therefore, developing a filter sleeve fixing method that can maintain high connection stability in dynamic and harsh environments and fundamentally eliminate the risk of detachment is an urgent need to improve the reliability and safety of sewage pumps. Utility Model Content

[0006] The purpose of this invention is to provide a sewage pump to solve the problems mentioned in the background art.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a sewage pump, including a pump body, the lower end of the pump body having a water inlet end, a filter sleeve being provided at the water inlet end via threaded connection, and a multi-layer filter element being provided inside the filter sleeve. A vertical track is fixedly installed on the outer wall of the water inlet. A slider that can reciprocate vertically along the track is installed on the track. A positioning unit is fixedly installed on the slider. The positioning unit has two downwardly extending positioning clamping arms. A squeezing block is fixedly installed on the inner side of the lower end of each of the two positioning clamping arms. A squeezing cavity is formed between the two squeezing blocks. In the initial state, the two squeezing blocks tend to move towards the squeezing cavity. The upper end of the filter sleeve has a positioning rod; During the process of threading the filter sleeve with the water inlet end, controlling the positioning unit to move upward along the track can avoid obstructing the positioning rod; When the filter sleeve and the water inlet are threaded into place, the positioning rod will be located directly below the squeezing chamber. By controlling the positioning unit to move down along the track, the positioning rod can be placed inside the squeezing chamber, and the two squeezing blocks can press and fix the positioning rod.

[0008] By adopting the above technical solution, a filter sleeve is provided at the water inlet end via a threaded connection, which facilitates the installation and disassembly of the filter sleeve. The two pressing blocks in the positioning unit can press and fix the positioning rod above the filter sleeve, preventing the filter sleeve from slowly rotating in the opposite direction relative to the water inlet end under the alternating load caused by strong vibration, water impact, and frequent start-stop. This improves the connection stability between the water inlet end and the filter sleeve. The track is set to allow the positioning unit to move up and down, so as to avoid obstructing the positioning rod during the process of threading the filter sleeve with the water inlet end.

[0009] A further provision is that the positioning unit includes a housing fixed to the slider, a cover plate covering the front end of the housing, a cavity inside the housing, two symmetrical drive blocks disposed in the cavity, two positioning clamping arms respectively fixed to the lower ends of the two drive blocks, and at least one compression spring disposed between the outer side of the two drive blocks and the corresponding cavity wall, the compression spring applying an inward force, causing the two extrusion blocks to tend to move toward the extrusion cavity in the initial state.

[0010] By adopting the above technical solution, the compression spring is used to apply an inward force to control the two extrusion blocks to move inward and maintain the compression of the positioning rod.

[0011] A further provision is that at least one horizontal limiting groove is fixedly provided on the inner wall of the housing, and each of the two driving blocks is fixedly provided with a limiting segment that pushes into the limiting groove.

[0012] By adopting the above technical solution, the driving block is guided to move horizontally through the cooperation of the limiting groove and the limiting segment.

[0013] A further configuration includes a driving cavity formed between the two driving blocks. A through hole is provided at the upper end of the housing, through which a vertical control rod passes. The bottom of the control rod extends into the driving cavity, and control side blocks are fixedly provided on both sides of the bottom of the control rod. An inclined first guide surface is provided on the outer side of each of the two control side blocks, and an inclined second guide surface is provided on the inner side of each of the two driving blocks. The first guide surface and the corresponding second guide surface remain in contact. As the control rod moves downward, it can control the two driving blocks to move together in the opposite direction to the extrusion cavity.

[0014] By adopting the above technical solution, based on the cooperation of the first guide surface and the second guide surface, the longitudinal force is transformed into a horizontal force that simultaneously controls the horizontal movement of the two drive blocks.

[0015] A further feature is that a pressing disc is fixedly installed on the top of the control lever for easy pressing.

[0016] By adopting the above technical solution, the pressing plate can increase the contact area, making it easier for the operator to press.

[0017] A further feature is that the front and rear sides of both control blocks are provided with inclined sliding grooves, and both drive blocks are provided with sliding sections that can be connected to the sliding grooves.

[0018] By adopting the above technical solution, the cooperation between the chute and the sliding section plays a limiting role.

[0019] A further feature is that the housing contains a first limiting block located between the two positioning clamping arms.

[0020] By adopting the above technical solution, the first limiting block can limit the position between the two positioning clamping arms, avoiding the compression cavity space being too narrow, so that the positioning rod cannot be inserted.

[0021] A further feature is that a second limiting block is fixedly installed at the lower end of the track.

[0022] By adopting the above technical solution, the second limiting block can not only prevent the slider from falling off, but also play a positioning role.

[0023] In summary, this utility model has the following beneficial effects: by setting a positioning unit, it can prevent the filter sleeve from slowly rotating in the opposite direction relative to the water inlet under strong vibration, hydraulic impact and alternating load caused by frequent start-stop; thereby improving the connection stability between the water inlet and the filter sleeve and fundamentally eliminating the risk of detachment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment; Figure 2 for Figure 1 Enlarged view of section A; Figure 3 This is a schematic diagram of the filter element structure in the embodiment; Figure 4 This is a schematic diagram of the positioning unit in the embodiment (the cover plate is hidden). Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0025] In the diagram: 11. Pump body; 12. Water inlet; 21. Filter sleeve; 22. Filter element; 23. Positioning rod; 31. Track; 41. Positioning clamp arm; 42. Extrusion block; 43. Extrusion chamber; 51. Housing; 511. Cover plate; 52. Drive block; 53. Compression spring; 54. Limiting groove; 55. Limiting section; 56. Drive chamber; 61. Control rod; 62. Control side block; 63. Pressing plate; 71. First guide surface; 81. Slide groove; 82. Sliding section; 91. First limiting block; 92. Second limiting block. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] As attached Figures 1 to 5 As shown; This embodiment discloses a sewage pump, including a pump body 11. The lower end of the pump body 11 has a water inlet end 12. A filter sleeve 21 is provided at the water inlet end 12 by threaded connection. A multi-layer filter element 22 is provided inside the filter sleeve 21. A vertical track 31 is fixedly installed on the outer wall of the water end. A slider that can reciprocate vertically along the track 31 is installed on the track 31. A positioning unit is fixedly installed on the slider. The positioning unit has two downwardly extending positioning clamping arms 41. A pressing block 42 is fixedly installed on the inner side of the lower end of the two positioning clamping arms 41. A pressing cavity 43 is formed between the two pressing blocks 42. In the initial state, the two pressing blocks 42 tend to move towards the pressing cavity 43. The upper end of the filter sleeve 21 has a positioning rod 23; During the process of threaded connection between the filter sleeve 21 and the water inlet 12, the control positioning unit moves upward along the track 31, which can avoid obstructing the positioning rod 23. When the filter sleeve 21 and the water inlet 12 are in place by threaded connection, the positioning rod 23 will be located directly below the squeezing chamber 43. By controlling the positioning unit to move down along the track 31, the positioning rod 23 can be placed in the squeezing chamber 43, and the two squeezing blocks 42 can press and fix the positioning rod 23.

[0028] In one possible implementation, the positioning unit includes a housing 51 fixed on the slider, a cover plate 511 covering the front end of the housing 51, a cavity inside the housing 51, two symmetrical drive blocks 52 arranged in the cavity, two positioning clamping arms 41 respectively fixed to the lower ends of the two drive blocks 52, and two compression springs 53 arranged between the outer side of the two drive blocks 52 and the corresponding cavity wall, the compression springs 53 applying an inward force, causing the two extrusion blocks 42 to tend to move towards the extrusion cavity 43 in the initial state.

[0029] In one possible implementation, two horizontal limiting grooves 54 are fixedly provided on the inner wall of the housing 51, and limiting segments 55 that push into the limiting grooves 54 are fixedly provided on both drive blocks 52.

[0030] In one possible implementation, a drive cavity 56 is formed between the two drive blocks 52. A through hole is provided at the upper end of the housing 51, through which a vertical control rod 61 is inserted. The bottom of the control rod 61 extends into the drive cavity 56, and control side blocks 62 are fixedly provided on both sides of the bottom of the control rod 61. An inclined first guide surface 71 is provided on the outer side of the two control side blocks 62, and an inclined second guide surface is provided on the inner side of the two drive blocks 52. The first guide surface 71 and the corresponding second guide surface are kept in contact. As the control rod 61 moves down, the two drive blocks 52 can be controlled to move together in the opposite direction to the extrusion cavity 43.

[0031] In one possible implementation, a pressable disc 63 is fixedly provided on the top of the control lever 61 for easy pressing.

[0032] In one possible implementation, the front and rear sides of the two control blocks 62 are provided with inclined grooves 81, and the two drive blocks 52 are provided with sliding sections 82 that can be connected to the grooves 81.

[0033] In one possible implementation, a first limiting block 91 is provided in the housing 51 between the two positioning clamping arms 41.

[0034] In one possible implementation, a second limiting block 92 is fixedly installed at the lower end of the track 31.

[0035] The working process of this embodiment is as follows: When installing the filter sleeve 21, screw the filter sleeve 21 onto the water inlet 12 using the screw thread. During this process, the operator pulls the housing 51 with one hand to avoid obstructing the positioning rod 23. After the filter sleeve 21 and the water inlet 12 are properly threaded, the operator presses down on the pressing plate 63 with the other hand to control the two drive blocks 52 to move together in the opposite direction to the squeezing chamber 43, at which point the squeezing chamber 43 expands. Then, the operator releases the upward pull on the housing 51, and the housing 51, under its own weight,... As the force falls, the slider will collide with the second limit block 92 to prevent the slider from falling off. At this time, the positioning rod 23 is exactly in the squeezing chamber 43. Then the operator cancels the operation of pressing down the pressing plate 63. The two squeezing blocks 42 can press the fixed positioning rod 23, thereby preventing the filter sleeve 21 from slowly rotating in the opposite direction relative to the water inlet end 12 under the alternating load caused by strong vibration, water impact and frequent start and stop. Ultimately, it improves the connection stability between the water inlet end 12 and the filter sleeve 21, and fundamentally eliminates the risk of falling off.

[0036] When disassembling the filter sleeve 21, the operator presses down on the pressing plate 63 with one hand to release the two pressing blocks 42 from pressing the positioning rod 23. Then, the operator pulls up the housing 51 with the other hand, releases the hand that was pressing down on the pressing plate 63, and frees up the other hand to unscrew the filter sleeve 21 normally to complete the disassembly.

[0037] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A sewage pump, comprising a pump body (11), wherein the lower end of the pump body (11) has a water inlet end (12), and a filter sleeve (21) is threadedly fitted at the water inlet end (12), characterized in that: The filter sleeve (21) is provided with a multi-layer filter element (22); A vertical track (31) is fixedly installed on the outer wall of the water inlet (12). A slider that can reciprocate vertically along the track (31) is installed on the track (31). A positioning unit is fixedly installed on the slider. The positioning unit has two downwardly extending positioning clamping arms (41). An extrusion block (42) is fixedly installed on the inner side of the lower end of the two positioning clamping arms (41). An extrusion cavity (43) is formed between the two extrusion blocks (42). In the initial state, the two extrusion blocks (42) tend to move towards the extrusion cavity (43). The upper end of the filter sleeve (21) has a positioning rod (23); During the process of threading the filter sleeve (21) with the water inlet (12), controlling the positioning unit to move upward along the track (31) can avoid obstructing the positioning rod (23); When the filter sleeve (21) and the water inlet (12) are in place by threaded connection, the positioning rod (23) will be located directly below the squeezing chamber (43). By controlling the positioning unit to move down along the track (31), the positioning rod (23) can be placed in the squeezing chamber (43), and the two squeezing blocks (42) can press and fix the positioning rod (23).

2. A sewage pump according to claim 1, characterized in that: The positioning unit includes a housing (51) fixed on the slider. The front end of the housing (51) is covered with a cover plate (511). The housing (51) has a cavity. Two symmetrical drive blocks (52) are arranged in the cavity. Two positioning clamping arms (41) are respectively fixed to the lower end of the two drive blocks (52). At least one compression spring (53) is arranged between the outer side of the two drive blocks (52) and the corresponding cavity wall. The compression spring (53) applies an inward force, so that the two extrusion blocks (42) tend to move towards the extrusion cavity (43) in the initial state.

3. A sewage pump according to claim 2, characterized in that: At least one horizontal limiting groove (54) is fixedly provided on the inner wall of the housing (51), and each of the two driving blocks (52) is fixedly provided with a limiting segment (55) that pushes into the limiting groove (54).

4. A sewage pump according to claim 2, characterized in that: A driving cavity (56) is formed between the two driving blocks (52). A through hole is provided at the upper end of the housing (51). A vertical control rod (61) is inserted through the through hole. The bottom of the control rod (61) extends into the driving cavity (56). Control side blocks (62) are fixedly provided on both sides of the bottom of the control rod (61). An inclined first guide surface (71) is provided on the outer side of the two control side blocks (62). An inclined second guide surface is provided on the inner side of the two driving blocks (52). The first guide surface (71) and the corresponding second guide surface are kept in contact. As the control rod (61) moves down, the two driving blocks (52) can be controlled to move together in the opposite direction to the extrusion cavity (43).

5. A sewage pump according to claim 4, characterized in that: The top of the control lever (61) is fixedly provided with a pressing plate (63) for easy pressing.

6. A sewage pump according to claim 4, characterized in that: Both control blocks (62) have oblique grooves (81) on their front and rear sides, and both drive blocks (52) have sliding sections (82) that can be connected to the grooves (81).

7. A sewage pump according to claim 2, characterized in that: The housing (51) is provided with a first limiting block (91) located between two positioning clamping arms (41).

8. A sewage pump according to claim 1, characterized in that: A second limiting block (92) is fixedly installed at the lower end of the track (31).

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