Double-suction centrifugal pump with function of protecting impeller

Abstract

This invention relates to the field of centrifugal pump technology, specifically to a double-suction centrifugal pump with impeller protection function; it includes: a suction pump body, a pump shaft passing through the pump body and a double-suction impeller fixed on the pump shaft, the pump body also having a first inlet chamber and a second inlet chamber respectively communicating with the two inlets on both sides of the double-suction impeller, the pump body having an inlet port communicating with the first inlet chamber and the second inlet chamber, and the pump body also having a volute pressure water chamber surrounding the outer edge of the double-suction impeller; a protection module, disposed in the pump body, the protection module having a first filter unit and a second filter unit capable of primary and secondary filtration of impurities in the water source; this invention can directionally guide and filter impurities that easily cause damage to the double-suction impeller, effectively avoiding damage to the double-suction impeller, and providing good protection.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, specifically to a double-suction centrifugal pump with impeller protection function. Background Technology

[0002] Double-suction centrifugal pumps are widely used in municipal water supply and drainage, industrial circulating water, and energy transmission due to their large flow rate and stable operation. These pumps typically achieve symmetrical water intake through double-suction impellers to reduce axial force and improve operating efficiency. In actual operation, the pumped medium often contains a certain amount of particulate impurities or experiences cavitation. As the core working component, the impeller is subjected to high-speed rotation and fluid scouring for extended periods, and its stress and wear directly affect the overall performance and service life of the pump.

[0003] In existing technologies, the impellers of double-suction centrifugal pumps are mostly directly exposed within the flow channel, lacking effective protective structures. When the medium contains hard particles, they easily cause erosion and wear on the impeller blades and hub, leading to increased impeller surface roughness and decreased dynamic balance performance, thus affecting the pump's efficiency and stability. Under conditions of cavitation or uneven flow, localized impacts and material fatigue may also occur, causing impeller damage or even failure. Furthermore, existing structures lack effective guiding or buffering measures when impurities enter the flow channel, allowing particles to directly impact critical impeller components, further exacerbating wear.

[0004] On the other hand, traditional double-suction centrifugal pumps focus primarily on optimizing hydraulic performance in their structural design, with relatively insufficient protection measures for the impeller. The lack of coordinated design between the protective structures and the main flow channel makes it difficult to effectively reduce particle impact and may even affect fluid flow to some extent, thus making it difficult to achieve a balance between protection and flow performance. Therefore, under long-term operation and complex conditions, impeller damage remains a significant problem, leading to frequent maintenance and increased operating costs. Summary of the Invention

[0005] To address the aforementioned problems, a double-suction centrifugal pump with impeller protection function is provided. This centrifugal pump not only provides qualitative guidance for water intake but also filters impurities in the water that can directly impact and erode the double-suction impeller. This solves the technical problem that existing double-suction impellers are prone to damage, leading to a significant decrease in liquid guiding capacity.

[0006] To address the problems of existing technologies, this invention provides a double-suction centrifugal pump with impeller protection function, comprising: a suction pump body, a pump shaft passing through the pump body and a double-suction impeller fixed on the pump shaft, the pump body also having a first inlet chamber and a second inlet chamber respectively communicating with the two inlets on both sides of the double-suction impeller, the pump body having an inlet communicating with the first inlet chamber and the second inlet chamber, the pump body also having a volute pressure water chamber surrounding the outer edge of the double-suction impeller, the end of the volute pressure water chamber communicating with an outlet on the pump body; a protection module, disposed in the suction pump body, the protection module having a first filter unit and a second filter unit capable of primary and secondary filtration of impurities in the water source; when the water source is sucked into the volute pressure water chamber through the first inlet chamber and the second inlet chamber, the particles in the water source will be filtered one by one through the first filter unit and the second filter unit.

[0007] Preferably, the first filtration unit is provided with a filter element that can guide water source to circulate in the first liquid inlet chamber and filter the water source, and an elastic opening and closing element that can open the discharge port in the middle of the filter element under a preset adsorption pressure; the elastic opening and closing element is coaxially slidably disposed outside the pump shaft and located in the middle of the filter element, for elastically sealing the discharge port.

[0008] Preferably, the filter element is a filter cover that is adapted to the shape of the inner wall of the second liquid inlet chamber and is smaller in size than the second liquid inlet chamber. The gap between the filter cover and the first liquid inlet chamber forms a flow channel for guiding the water source. The impurity discharge port is opened through the middle of the filter cover to discharge blockage impurities.

[0009] Preferably, the first filtration unit further includes a guide groove capable of directionally guiding impurities discharged from the discharge port and a collection chamber capable of uniformly collecting impurities; the guide groove is radially fixedly disposed at the bottom of the filter element; the collection chamber is fixedly disposed at the bottom of the guide groove and communicates with the inside of the guide groove.

[0010] Preferably, the elastic opening and closing element includes a limiting ring, an opening and closing plate, and a spring capable of driving the opening and closing plate and the drain outlet to close; the limiting ring is coaxially fixedly disposed outside the pump shaft and disposed near the middle of the limiting ring; the opening and closing plate is coaxially slidably disposed outside the pump shaft and abuts against the drain outlet; the spring is coaxially sleeved and installed outside the pump shaft and its two ends abut against the opening and closing plate and the limiting ring, respectively.

[0011] Preferably, the opening and closing plate is a conical plate with a conical shape and its surface is densely covered with through holes for water to pass through.

[0012] Preferably, the opening and closing plate is also fixedly provided with a closing ring that can close the feed inlet of the guide groove in real time when the impurity is not being discharged; the closing ring is coaxially fixedly provided on the rear side of the opening and closing plate.

[0013] Preferably, the first filtration unit includes a water guide tube, a filter screen coaxially disposed at the end of the water guide tube for filtering impurities in the water source, and a collection tank for collecting the filtered impurities; the water guide tube is coaxially fixed at the liquid inlet; the filter screen is disposed at the end of the water guide tube in an inclined state.

[0014] The advantages of this invention compared to the prior art are: 1. This invention constructs a graded filtration and flow guiding synergistic structure in the dual-suction inlet path, so that the water flow entering the impeller area passes through filtration units of different particle size grades in sequence during the axial convergence process, realizing graded interception of large particles and fine impurities, avoiding impurities from directly entering the impeller flow channel, reducing the scouring and wear of the impeller inlet edge and flow channel surface from the source, thereby significantly improving the service life of the impeller and the stability of pump operation.

[0015] 2. By setting a flow-guiding filtration structure that matches the structure of the liquid inlet chamber, the present invention enables the water flow to form a stable and controllable flow path before entering the impeller, reducing turbulence and local impact phenomena, improving filtration coverage, and reducing adverse effects on water inlet performance while ensuring filtration effect, which is conducive to maintaining good hydraulic conditions.

[0016] 3. The present invention, through the cooperation of the opening and closing plate, the guide groove and the collection chamber, enables impurities to be quickly desorbed and directed to the collection area during the discharge process, reducing the retention of impurities on the filter surface, improving the impurity discharge efficiency, and maintaining a good sealing effect in the closed state, preventing impurities from flowing back or accidentally entering the impurity discharge channel when not in operation. Attached Figure Description

[0017] Figure 1 This is a 3D view of a double-suction centrifugal pump with impeller protection function.

[0018] Figure 2 This is a top view of a double-suction centrifugal pump with impeller protection function.

[0019] Figure 3 yes Figure 2 A three-dimensional sectional view of section AA.

[0020] Figure 4 yes Figure 3 A magnified view of section B.

[0021] Figure 5 This is a side view of a double-suction centrifugal pump with impeller protection function.

[0022] Figure 6 yes Figure 5 Sectional view at point CC.

[0023] Figure 7 yes Figure 6 A magnified view of a portion of point D.

[0024] Figure 8 This is an exploded perspective view of a double-suction centrifugal pump with impeller protection function.

[0025] The numbers on the map are: 1. Suction pump body; 11. Pump shaft; 12. Double-suction impeller; 13. First inlet chamber; 14. Second inlet chamber; 15. Inlet; 16. Outlet; 17. Servo motor; 2. Protective module; 21. First filtration unit; 211. Filter element; 2111. Impurity discharge port; 212. Elastic opening and closing element; 2121. Limiting ring; 2122. Opening and closing plate; 2123. Spring; 2124. Through hole; 2125. Closing ring; 213. Guide groove; 214. Collection bin; 22. Second filtration unit; 221. Water guide tube; 222. Filter screen; 223. Material collection trough. Detailed Implementation

[0026] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0027] See Figures 1 to 8 As shown: A double-suction centrifugal pump with impeller protection function includes a suction pump body 1, a pump shaft 11 passing through the pump body 1, and a double-suction impeller 12 fixed on the pump shaft 11. The pump body 1 also has a first inlet chamber 13 and a second inlet chamber 14 that are respectively connected to the two inlet ports 15 on both sides of the double-suction impeller 12. The pump body has inlet ports 15 that are connected to the first inlet chamber 13 and the second inlet chamber 14. The pump body also has a surrounding double-suction impeller. The impeller 12 has a spiral water pressure chamber on its outer edge, and the end of the spiral water pressure chamber is connected to an outlet 16 on the pump body; the protection module 2 is set inside the suction pump body 1, and the protection module 2 is equipped with a first filter unit 21 and a second filter unit 22 that can perform primary and secondary filtration of impurities in the water source; when the water source is sucked into the spiral water pressure chamber through the first inlet chamber 13 and the second inlet chamber 14, the particles in the water source will be filtered one by one through the first filter unit 21 and the second filter unit 22.

[0028] When the pump body 1 pumps water, the external water source first enters the first inlet chamber 13 and the second inlet chamber 14 through the inlet 15 under the action of pressure difference, forming a relatively symmetrical initial inlet flow field. Subsequently, the double-suction impeller 12 rotates synchronously under the drive of the pump shaft 11, forming a stable negative pressure suction field on both sides of the double-suction impeller 12, causing the water source located in the first inlet chamber 13 and the second inlet chamber 14 to converge axially towards the suction port of the double-suction impeller 12. In this process, the water source entering the first inlet chamber 13 and the second inlet chamber 14 needs to pass through the pre-set first filter unit 21 and second filter unit 22 in sequence. The first filter unit 21 performs primary interception of larger particulate impurities in the water source, while the second filter unit 22 performs secondary filtration of the fine particles that are not intercepted, thereby forming a graded filtration path, which significantly improves the cleanliness of the medium entering the impeller channel and avoids particles directly impacting the impeller inlet edge and the channel surface. Through the synergistic effect of the above-mentioned multi-stage filtration and bilateral symmetrical suction, stable water intake and effective isolation of impurities are achieved.

[0029] The suction pump body 1 also includes a servo motor 17 that can drive the pump shaft 11 to rotate.

[0030] The second filter unit 22 is provided in two sets. The two sets of the second filter unit 22 are rotatably arranged on the pump shaft 11 and respectively close to both sides of the double-suction impeller 12.

[0031] See Figure 7 and Figure 8 As shown: The first filtration unit 21 is provided with a filter element 211 that can guide water source to circulate in the first liquid inlet chamber 13 and filter the water source, and an elastic opening and closing element 212 that can open the discharge port 2111 in the middle of the filter element 211 under a preset adsorption pressure; the elastic opening and closing element 212 is coaxially slidably disposed outside the pump shaft 11 and located in the middle of the filter element 211, for elastically sealing the discharge port 2111.

[0032] After the water source enters through the inlet 15 and completes the primary filtration of the first filtration unit 21, under the guiding action of the filter element 211, the water source flows orderly along a predetermined path in the first inlet chamber 13, gradually changing from radial to axial flow, and is finally stably guided to the suction port area of ​​the double-suction impeller. During the further convergence of the water flow towards the impeller, fine impurities not completely intercepted by the first filtration unit 21 will come into contact with the second filtration unit 22 again and be effectively blocked on its outside, thereby preventing fine particles from entering the impeller flow channel and causing continuous wear on the impeller surface. When the filter holes on the outer surface of the filter element 211 become partially blocked due to impurity accumulation, the elastic opening and closing element 212 undergoes elastic deformation under the negative pressure generated by the continuous suction of the impeller, driving the discharge port 2111 to open, creating an instantaneous release channel in the blocked area and restoring the filtration to a smooth state.

[0033] See Figures 6 to 8 As shown: The filter element 211 is specifically a filter cover that is adapted to the shape of the inner wall of the second liquid inlet chamber 14 and is smaller in size than the second liquid inlet chamber 14. The gap between the filter cover and the first liquid inlet chamber 13 forms a flow channel for guiding the water source. The impurity discharge port 2111 is opened through the middle of the filter cover to discharge blockage impurities.

[0034] By setting a filter cover that matches the contour of the inner wall of the second inlet chamber 14 and is slightly smaller than the second inlet chamber 14, the water entering the inlet chamber is spatially constrained and flows along a predetermined flow channel, thereby forming a stable and controllable streamline distribution. When the water flows over the surface of the filter cover, it forms a large-area contact with the filter cover, allowing impurities in the water flow to be continuously screened and intercepted during the flow, avoiding local short-circuit flow or flow around the filtration area. At the same time, this structure can also homogenize the flow velocity to a certain extent, reducing the impact of turbulence on the filtration effect.

[0035] See Figure 7 and Figure 8 As shown: The first filter unit 21 further includes a guide groove 213 that can guide the impurities discharged from the impurity discharge port 2111 in a directional manner and a collection chamber 214 that can collect the impurities uniformly; the guide groove 213 is radially fixedly disposed at the bottom of the filter element 211; the collection chamber 214 is fixedly disposed at the bottom of the guide groove 213 and communicates with the inside of the guide groove 213.

[0036] When impurities gradually adsorb and accumulate on the outer surface of the filter element 211, causing a decrease in local flow capacity, the elastic opening and closing element 212 drives the impurity discharge port 2111 to open under the continuous negative pressure generated by the double suction impeller. The impurities attached to the filter surface quickly leave the filtration area and enter the impurity discharge port 2111 under the pressure difference. Subsequently, they are transported to the collection chamber 214 for centralized collection under the guidance of the guide groove 213. This process is an instantaneous dynamic impurity discharge process that does not affect the continuous liquid supply of the main fluid channel, thereby achieving synchronous filtration and impurity discharge.

[0037] See Figure 7 and Figure 8 As shown: The elastic opening and closing element 212 is provided with a limiting ring 2121, an opening and closing plate 2122, and a spring 2123 that can drive the opening and closing plate 2122 and the sewage outlet to close; the limiting ring 2121 is coaxially fixedly disposed outside the pump shaft 11 and is disposed near the middle of the limiting ring 2121; the opening and closing plate 2122 is coaxially slidably disposed outside the pump shaft 11 and abuts against the sewage outlet 2111; the spring 2123 is coaxially sleeved and installed outside the pump shaft 11 and its two ends abut against the opening and closing plate 2122 and the limiting ring 2121 respectively.

[0038] When the water flow channel is blocked due to impurities adhering to the surfaces of the filter element 211 and the opening / closing plate 2122, under continuous negative pressure, the opening / closing plate 2122 moves axially in the opening direction against the elastic force of the spring 2123, thereby expanding the opening of the discharge port 2111. This allows the adhering impurities to be concentrated and sucked into the guide groove 213 and transported to the collection chamber 214 under suction. As the impurities are removed, the effective through-hole 2124 area is exposed again on the surfaces of the filter element 211 and the opening / closing plate 2122, restoring normal flow. Subsequently, the opening / closing plate 2122 resets under the action of the elastic element, reforming the closed structure.

[0039] See Figure 8 As shown: The opening and closing plate 2122 is a tapered plate with a conical shape and its surface is densely covered with through holes 2124 for water to pass through.

[0040] The tapered surface of the opening and closing plate 2122 is axially oriented toward the discharge port 2111.

[0041] By setting the opening and closing plate 2122 as a conical structure, when it opens the impurity discharge port 2111, the conical surface can generate a radial force on the impurities, causing the impurities to disperse circumferentially and quickly detach from the surface of the opening and closing plate 2122, thus preventing impurities from accumulating in local areas. At the same time, the conical structure is conducive to forming a tighter fit when closed, thereby ensuring the sealing effect.

[0042] See Figure 8As shown: The opening and closing plate 2122 is also fixedly provided with a closing ring 2125 that can close the feed inlet of the guide groove 213 in real time when the impurity is not being discharged; the closing ring 2125 is coaxially fixedly provided on the rear side of the opening and closing plate 2122.

[0043] By setting a closed ring 2125, the opening and closing plate 2122 can effectively seal the inlet of the guide groove 213 when it is not open, preventing impurities from accidentally entering the collection path when not in the discharge condition, while ensuring the controllable accumulation position of impurities in the filtration area, providing conditions for subsequent centralized discharge.

[0044] See Figure 4 As shown: The first filtration unit 21 is provided with a water guide tube 221 and a filter screen 222 coaxially disposed at the end of the water guide tube 221 to filter impurities in the water source, and a collection tank 223 to collect the filtered impurities; the water guide tube 221 is coaxially fixedly disposed at the liquid inlet 15; the filter screen 222 is disposed at the end of the water guide tube 221 in an inclined state.

[0045] The mesh size of the filter screen 222 is larger than that of the filter element 211, thus forming a graded filtration structure from coarse to fine in the overall filtration system. When water enters the suction pump body 1, it first enters the water guide tube 221, and flows to the end under the guidance of the water guide tube 221 and passes through the filter screen 222. The filter screen 222 performs preliminary screening of larger particles of impurities. Because the filter screen 222 is arranged in an inclined state, impurities slide along the surface of the filter screen 222 under the action of gravity and water flow and finally fall into the collection tank 223 for centralized collection, avoiding retention on the surface of the filter screen 222. The water that has undergone preliminary filtration then enters the subsequent filtration structure to achieve step-by-step purification.

[0046] This invention can directionally guide and filter impurities that easily damage the double-suction impeller, effectively preventing damage to the double-suction impeller and providing good protection.

[0047] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A double-suction centrifugal pump with impeller protection function, characterized in that, include: The suction pump body is provided with a pump shaft passing through the inside of the suction pump body and a double-suction impeller fixed on the pump shaft. The inside of the suction pump body is also provided with a first liquid inlet chamber and a second liquid inlet chamber that are respectively connected to the liquid inlets on both sides of the double-suction impeller. The pump body is provided with a liquid inlet that is connected to the first liquid inlet chamber and the second liquid inlet chamber. The inside of the pump body is also formed with a volute pressure water chamber arranged around the outer edge of the double-suction impeller. The end of the volute pressure water chamber is connected to a liquid outlet opened on the pump body. A protection module is installed inside the suction pump body. The protection module is equipped with a first filter unit and a second filter unit that can perform primary and secondary filtration of impurities in the water source. When water is drawn into the volute pressure chamber through the first and second inlet chambers, the particles in the water will be filtered one by one through the first and second filtration units.

2. A double-suction centrifugal pump with impeller protection function according to claim 1, characterized in that, The first filtration unit is equipped with a filter element that can guide water source to circulate in the first liquid inlet chamber and filter the water source, and an elastic opening and closing element that can open the discharge port in the middle of the filter element under a preset adsorption pressure. The elastic opening and closing element is coaxially slidably disposed outside the pump shaft and located in the middle of the filter element, for elastically sealing the discharge port.

3. A double-suction centrifugal pump with impeller protection function according to claim 2, characterized in that, The filter element is specifically a filter cover that is adapted to the shape of the inner wall of the second liquid inlet chamber and is smaller in size than the second liquid inlet chamber. The gap between the filter cover and the first liquid inlet chamber forms a flow channel for guiding the water source. The discharge port is opened through the middle of the filter cover to discharge blockage impurities.

4. A double-suction centrifugal pump with impeller protection function according to claim 2, characterized in that, The first filtration unit also includes a guide channel that can directionally guide the impurities discharged from the discharge port and a collection chamber that can uniformly collect the impurities. The guide groove is radially fixedly disposed at the bottom of the filter element; The collection chamber is fixedly installed at the bottom of the guide groove and communicates with the inside of the guide groove.

5. A double-suction centrifugal pump with impeller protection function according to claim 4, characterized in that, The elastic opening and closing element is provided with a limiting ring, an opening and closing plate, and a spring that can drive the opening and closing plate and the drain outlet to close. The limiting ring is coaxially fixed outside the pump shaft and close to the middle of the limiting ring; The opening and closing plate is coaxially slidably disposed outside the pump shaft and abuts against the discharge port; The spring is coaxially sleeved and installed outside the pump shaft, with its two ends abutting against the opening and closing plate and the limiting ring, respectively.

6. A double-suction centrifugal pump with impeller protection function according to claim 5, characterized in that, The opening and closing plate is a conical plate with a conical shape and its surface is densely covered with through holes for water to pass through.

7. A double-suction centrifugal pump with impeller protection function according to claim 5, characterized in that, The opening and closing plate is also fixedly provided with a closing ring that can close the feed inlet of the guide groove in real time when the impurity is not being discharged. The closed ring is coaxially fixedly disposed on the rear side of the opening and closing plate.

8. A double-suction centrifugal pump with impeller protection function according to claim 1, characterized in that, The first filtration unit is provided with a water guide tube, a filter screen coaxially disposed at the end of the water guide tube to filter impurities in the water source, and a collection tank to collect the filtered impurities. The water guide tube is coaxially and fixedly installed at the liquid inlet; The filter screen is installed at an angle at the end of the water guide tube.

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