High-sealing-performance mixed-flow pump based on hydroelectric generation

Abstract

The invention relates to the technical field of mixed-flow pumps for hydroelectric power generation, and particularly discloses a high-sealing-performance mixed-flow pump based on hydroelectric power generation, which comprises a pump shell provided with a shaft hole and used for rotating a rotating shaft, a shaft sleeve in threaded connection with the end part of the rotating shaft, and a sealing ring arranged on the shaft sleeve, the protective cylinder is located on the outer side of the rotating shaft and located on the inner diameter of the screw blades, and the impeller cylinder is provided with blades on the circumference of the side wall. According to the high-sealing-performance mixed-flow pump based on hydroelectric generation, the possibility that water leaks towards the rear portion of the threaded inclined strip is greatly reduced through clamping of the threaded sealing function and the labyrinth sealing function, the pressure cavity can isolate the leaked water, the water in the pressure cavity is pumped back to the front portion of the leaked water through the action of the piston, and therefore the water leakage is avoided. Leaked water needs to pass through the two seals again, the water seepage and leakage difficulty is increased, efficient sealing and anti-leakage safety are achieved, and finally the shaft seal is used for wrapping the bottom, so that the water is not prone to leaking outwards.

Description

Technical Field

[0001] The present invention relates to the technical field of mixed flow pumps for hydropower generation, and in particular to a high-sealing mixed flow pump based on hydropower generation. Background Art

[0002] Hydroelectric power generation systems use the potential energy of lakes, rivers, and other high-altitude areas to flow downward, and install turbines at these low locations to convert this potential energy into electrical energy. At night, when there is excess electricity, electricity is used to power mixed-flow pumps, which pump water from low locations back up to store energy.

[0003] According to the publication (announcement) number: CN116576156B, the publication (announcement) date: 2024-04-26, a mixed flow pump based on centrifugal force is disclosed, including a pump body provided with a drive shaft, an impeller is installed at the end of the drive shaft, and the impeller is located in the inner cavity of the pump body and rotates to transport water.

[0004] In the prior art including the above-mentioned patents, since the mixed flow pump needs to transport water from a low position to a high position, the water head is usually equipped with a longer climbing pipe, and the water at the low position usually contains a certain amount of sludge particles, which will inevitably enter the pump casing during the water transportation process. If multiple water storage tanks are used to precipitate the sludge for the low-position water, once the water in the tank is transferred, the precipitated sludge will inevitably surge, making it impossible for the water added to the tank to precipitate the sludge in a short period of time and it will be directly extracted and transported. In order to reduce the site occupation area and management and maintenance costs, although a filter can be installed on the flange, the workload of regular cleaning will also increase accordingly. Therefore, the sludge entering the pump casing still exists in large quantities, and even "dead water areas" will appear in some positions inside the pump casing, causing the sludge deposition to thicken and increase. In order to weaken the water hammer effect caused by the water head during the shutdown process, a horizontal pipe is usually set between the lower end of the water head and the outlet pipe of the mixed flow pump. However, this increases the length of sludge accumulation. The water hammer effect will also stir up the sludge particles, causing the particles to cause serious wear on the impeller surface, the shaft surface and the shaft sealing position, reducing the service life of the blades and the sealing safety between the shaft and the pump casing. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-sealing mixed-flow pump based on hydropower generation, aiming to solve the above-mentioned problems.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A high-sealing mixed-flow pump for hydropower generation includes a pump housing with an axial hole and a rotating shaft, wherein a screw blade is fixedly installed in the axial hole, and an annular groove is formed between the threads of the screw blade, and further includes: A shaft sleeve is threadedly connected to the end of the rotating shaft and is provided with a protective sleeve located outside the rotating shaft and at the inner diameter of the screw blade; The impeller cylinder has blades arranged circumferentially on its side wall, and its inner wall is provided with a sleeve seal that slides axially with the outer wall of the casing, and: The outer wall of the casing is also provided with a threaded oblique strip which matches the screw blade and is arranged opposite to the ring groove; A storage cavity is provided on one side of the threaded bevel strip, and a pressure cavity communicated with the storage cavity is provided on the other side, and the sleeve seal is moved down to make the storage cavity negative pressure.

[0007] Preferably, the pump housing is provided with a spiral cone outside the plurality of annular grooves, wherein: The inner diameter of the spiral cone is gradually changed, and the end with the smallest inner diameter is connected to the pressure chamber.

[0008] Preferably, the pump housing is provided with an air cavity connected to the end portion with the maximum inner diameter of the spiral cone.

[0009] Preferably, the air cavity has an opening, and a cover is fixedly installed at the opening, and the cover is provided with air holes for supplying air into the air cavity.

[0010] Preferably, the pump housing is provided with a row of holes vertically connected to the pressure chamber.

[0011] Preferably, the end of the impeller cylinder is provided with a collar located outside the sleeve seal, and the pump casing is provided with an annular chamber for the sliding embedding of the collar.

[0012] Preferably, an external thread is provided on the side wall of the shaft sleeve, and the inner wall of the impeller cylinder is threadably movable with the external thread, and the collar is locked after being axially moved to a predetermined position.

[0013] Preferably, an elastic member that contacts and cooperates with the end of the collar is provided in the annular chamber, and the elastic member is compressed to maintain maximum deformation in the locked state.

[0014] Preferably, a drainage cone is provided at the end of the shaft sleeve, and a drainage recess is provided on the drainage cone to cooperate with adjacent blades.

[0015] Preferably, the impeller tube moves toward each other when the thread moves.

[0016] In the above technical solution, the present invention provides a high-sealing mixed flow pump based on hydropower generation, which has the following beneficial effects: the casing shields the rotating shaft clamp to prevent water from eroding the rotating shaft, and the sleeve seals the water seepage gaps on the outside of the casing to reduce water infiltration into the storage chamber. At the same time, it also increases the blocking and protection capability of the outside of the casing, making it difficult for water containing particles to penetrate into the storage chamber through the tortuous gaps on the outside of the impeller tube, thereby ensuring basic sealing safety. The combination of threaded strips and spiral blades can achieve threaded sealing, and multiple ring grooves are located on the outside of the threaded strips, which can achieve labyrinth sealing. With the support of the two sealing functions, the possibility of water seeping into the storage chamber continuing to leak behind the threaded strips is greatly reduced. The threaded strips also have a pressure chamber to temporarily store and isolate the leaked water, and use the piston action to pump the leaked water in the pressure chamber back to the front of the threaded strips, so that the leaked water needs to pass through two seals again, increasing the difficulty of water leakage, thereby meeting high-efficiency sealing and anti-leakage safety. Finally, there is a shaft seal to make the water in the pump casing extremely unlikely to leak out, thereby ensuring the sealing safety of the rotating shaft during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of a mixed flow pump from the right side according to an embodiment of the present invention; Figure 2 A schematic diagram of a mixed flow pump from the left side according to an embodiment of the present invention; Figure 3 A schematic diagram of a mixed flow pump provided by an embodiment of the present invention from a left side perspective with the water inlet removed; Figure 4 A front cross-sectional schematic diagram of a mixed flow pump provided in an embodiment of the present invention; Figure 5 A schematic diagram of an enlarged front cross-sectional view of a mixed flow pump provided by an embodiment of the present invention; Figure 6 for Figure 5 A magnified schematic diagram of point A; Figure 7 for Figure 5 A magnified schematic diagram of point B; Figure 8 A schematic diagram of a mixed flow pump provided by an embodiment of the present invention, from a right side perspective, with the water inlet, cover, and internal parts removed; Figure 9 A schematic diagram of the assembly of a rotating shaft, a sleeve, and an impeller provided in an embodiment of the present invention; Figure 10 A schematic diagram showing the assembly of a rotating shaft, a sleeve, and an impeller from a left side perspective according to an embodiment of the present invention; Figure 11 An exploded schematic diagram of the parts on the shaft sleeve and impeller provided in an embodiment of the present invention; Figure 12 Schematic diagram of an exploded front view of various parts on the shaft sleeve and impeller provided in an embodiment of the present invention; Figure 13 A schematic diagram of the overlapping position of the first arc strip and the second arc strip provided in an embodiment of the present invention; Figure 14 A schematic diagram of a cover provided by an embodiment of the present invention; Figure 15 A schematic cross-sectional view of a rubber membrane located in a mounting groove according to an embodiment of the present invention.

[0019] Description of reference numerals: 1. Pump casing; 11. Shaft frame; 12. Air cavity; 121. Mounting groove; 13. Spiral cone; 14. Pressure chamber; 15. Liquid hole; 16. Storage chamber; 17. Ring groove; 18. Drain hole; 2. Rotating shaft; 3. Shaft sleeve; 30. Drainage cone; 301. Drainage depression; 31. Thread head; 32. Casing; 33. External thread; 34. Thread bevel; 341. First arc strip; 35. Shaft seal; 4. Impeller cylinder; 41. Blade; 42. Clamp sleeve; 43. Sleeve seal; 44. Ring; 5. Screw blade; 51. Second arc strip; 6. Set sleeve; 61. Ring chamber; 62. Ring plate; 63. Elastic part; 7. Cover; 71. Air hole. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-15 As shown, a high-sealing mixed flow pump based on hydropower generation includes a pump housing 1 with an axial hole and a rotating shaft 2, a screw plate 5 is fixedly installed in the axial hole, and an annular groove 17 is formed between the threads of the screw plate 5, and further includes: The shaft sleeve 3 is threadedly connected to the end of the shaft 2 and is provided with a protective tube 32 located on the outside of the shaft 2 and at the inner diameter of the screw piece 5; The impeller cylinder 4 has blades 41 arranged around its sidewall, and its inner wall is provided with a sleeve seal 43 that slides axially with the outer wall of the casing 32, and: The outer wall of the casing 32 is also provided with a threaded bevel 34 that matches the screw blade 5 and is arranged opposite to the annular groove 17; A storage chamber 16 is provided on one side of the threaded bevel strip 34 , and a pressure chamber 14 communicating with the storage chamber 16 is provided on the other side. The lower seal 43 is moved to create a negative pressure in the storage chamber 16 .

[0022] Specifically, the shell thickness of the pump casing 1 having the shaft hole (eccentrically arranged on the outer shell of the vortex-shaped pump casing 1 to provide a channel for the rotating shaft 2 to pass through) is greater than the shell thickness at other positions. The purpose is to increase the axial docking range of the shaft hole and the casing 32, so as to facilitate the sealing docking of the parts on the casing 32; the shaft bracket 11 in the prior art is also installed at this position, and the rotating shaft 2 is placed on the shaft bracket 11 with an upward opening to rotate.

[0023] Furthermore, a threaded head 31 is integrally formed at the end of the sleeve 3 and is located on the inner side of the casing 32, and the threaded head 31 is screwed and assembled with the threaded column groove opened at the end of the rotating shaft 2 (during assembly, a wrench or tool is required to clamp the end of the rotating shaft 2 extending out of the pump housing 1), thereby firmly fixing the sleeve 3 to the outside of the rotating shaft 2, so that the components of the casing 32 and its outer wall can work stably.

[0024] Furthermore, the sleeve seal 43 (having a lip in contact with the side wall of the casing 32, but the inner diameter of the rubber ring outside the lip is larger than the outer diameter of the threaded bevel 34, so that when the impeller tube 4 is sleeved on the outside of the casing 32 and the shaft sleeve 3 and the rotating shaft 2 are docked, the sleeve seal 43 is not interfered with by the assembly) is specifically a sealing rubber ring in the prior art. An annular groove is provided on the outer wall of the casing 32, and a shaft seal 35 is sleeved in the groove and contacts the inner wall of the shaft hole. The shaft seal 35 is also a sealing rubber ring in the prior art, and the shaft seal 35 is used to provide the last line of defense for the pressure chamber 14 (and the outer diameter of the rubber ring outside the lip of the shaft seal 35 is smaller than the inner diameter of the rubber ring of the sleeve seal 43, and the purpose is still to ensure that the sleeve is not affected when docking).

[0025] Furthermore, the screw piece 5 is integrally formed in the shaft hole, and the screw thread strip 34 is integrally formed on the outer wall of the casing 32, such as Figure 7 As shown, the direction of water seepage is from left to right, and the screw blade 5 and the thread bevel 34 have the same inclination angle and are inclined toward the inside of the pump casing 1. The purpose is to increase the difficulty of water climbing and leaking to the rear of the thread bevel 34 (away from the interior of the pump casing 1). During the climbing process, the water will also be retained by multiple annular grooves 17, reducing water leakage backwards.

[0026] Furthermore, a plurality of liquid holes 15 (which are strip-shaped molds pre-inserted during the casting of the pump casing 1) are provided in the thickened wall of the pump casing 1. The liquid holes 15 are used to connect the pressure chamber 14 and the storage chamber 16. The ports of the liquid holes 15 are also tightly plugged with a rubber tube with a plurality of rubber diaphragms installed inside. The rubber diaphragms are used to prevent water from flowing back from the storage chamber 16 to the pressure chamber 14, thereby ensuring the internal stability of the two chambers and the water transmission capacity.

[0027] Furthermore, the end of the screw thread bevel 34 in the rotation direction is integrally formed with a first arc 341, the front end of the screw blade 5 (in the liquid delivery direction, corresponding to the rear of the screw blade 5, such as Figure 11As shown in FIG, the second arc strip 51 is integrally formed, and after the threaded bevel strip 34 is screwed in and installed, the first arc strip 341 and the second arc strip 51 are in conflict, and the two arc strips are arranged perpendicular to the axis, so that when the two are fitted together and move circumferentially, there will be no axial translation due to the spiral arrangement, and as shown in FIG. Figure 13 As shown, the overlapping circumference of the two is greater than the circumference of a complete circle. Therefore, when the first arc bar 341 actively rotates on the fixed second arc bar 51, the two arc bars will not get stuck, thereby allowing the casing 32 to maintain stable rotation together with the rotating shaft 2.

[0028] The casing 32 can be used to clamp and shield a section of the rotating shaft 2 in the pump casing 1 to prevent water from eroding the rotating shaft 2. The sleeve seal 43 seals the water seepage gap on the outside of the casing 32 to reduce water from seeping into the storage chamber 16. At the same time, it also increases the blocking and protection capability of the outside of the casing 32, making it difficult for water containing particles to seep into the storage chamber 16 through the tortuous gap on the outside of the impeller tube 4, thereby ensuring basic sealing safety. The combination of the threaded bevel 34 and the spiral blade 5 can achieve threaded sealing, and multiple annular grooves 17 are located on the outside of the threaded bevel 34, which can achieve labyrinth sealing. With the support of the two sealing functions, the possibility of water seeping into the storage chamber 16 continuing to leak behind the threaded bevel 34 is greatly reduced. The threaded bevel 34 also has a pressure chamber 14 to temporarily store and isolate the leaked water, and uses the piston action to pump the leaked water in the pressure chamber 14 back to the front of the threaded bevel 34, so that the leaked water needs to pass through two seals again, increasing the difficulty of water leakage, thereby meeting efficient sealing and anti-leakage safety. Finally, there is a shaft seal 35 to provide a bottom line, so that the water in the pump housing 1 leaks outward very little, thereby ensuring the sealing safety of the rotating shaft 2 during operation.

[0029] As a further embodiment provided by the present invention, the pump housing 1 is provided with a spiral cone 13 outside the plurality of annular grooves 17, wherein: The inner diameter of the spiral cone 13 is gradually changed, and the end with the smallest inner diameter is connected to the pressure chamber 14 .

[0030] Specifically, the spiral cone 13 is also formed by placing a mold in advance when the pump housing 1 is cast, and the smaller bottom surface of the spiral cone 13 with a trapezoidal cross-section is communicated with the pressure chamber 14 .

[0031] Airflow is introduced into the pressure chamber 14 through the spiral cone 13 to compensate for the pressure drop caused by the lack of water inside the pressure chamber 14. The air pressure entering the pressure chamber 14 also acts inversely on the threaded bevel 34 to transport water, so that any water leakage from the threaded bevel 34 is blocked by the air pressure, further improving the waterproofing capability. As the inner diameter of the spiral cone 13 gradually tapers, it compensates for the airflow deceleration caused by the increased path, and can maintain a stable airflow into the pressure chamber 14. When the multiple annular grooves 17 handle water seepage, the squeezing and flowing of water will inevitably generate a certain amount of heat. Therefore, when the heat is transferred through the metal to the surrounding of the spiral cone 13, it is carried backward by the airflow and diffused to a certain extent, preventing overheating in the two sealing positions.

[0032] As another embodiment further provided by the present invention, an air cavity 12 is formed on the pump housing 1 and is connected to the end portion with the maximum inner diameter of the spiral cone 13 .

[0033] Specifically, the outer wall end surface of the thickened position of the pump housing 1 is integrally formed with a table-shaped ridge, and the shaft bracket 11 and the table-shaped ridge are detachably mounted with bolts and nuts, and the air cavity 12 is opened in the table-shaped ridge, and an annular mounting groove 121 adapted to the shape of its inner wall is opened in the air cavity 12, and a rubber membrane is embedded in the mounting groove 121. Figure 15 As shown, the edges and corners of the rubber membrane are in the shape of a round hammer, and the round hammer is embedded in the installation groove 121 and fastened, and the rubber membrane is flat as a whole after installation.

[0034] When the air pressure inside the pressure chamber 14 decreases, the spiral cone 13 actively draws air from the air chamber 12. At the same time, the rubber membrane is depressed downward like a diaphragm due to the negative pressure, so as to ensure that the airflow is stably delivered to the pressure chamber 14. At the same time, the rubber membrane also provides a seal for the spiral cone 13, so that the water in the pressure chamber 14 is not easy to leak through the spiral cone 13, and it is more difficult for the water in the pressure chamber 14 to climb back up the spiral cone 13 (because it needs to turn back), thereby reducing leakage at the sealing position.

[0035] As another embodiment further provided by the present invention, the air cavity 12 has an opening, and a cover 7 is fixedly installed at the opening. The cover 7 is provided with air holes 71 for supplying air into the air cavity 12 .

[0036] Specifically, the cover 7 is provided with a plurality of holes, and screw holes connected to the holes are provided on the outside of the opening so that the cover 7 can be installed on the pump housing 1 using bolts; the cross section of the air hole 71 is Z-shaped, which is convenient for ventilation and has the ability to prevent dirt from intruding.

[0037] The air cavity 12 can be opened and closed in a detachable manner through the cover 7, which is convenient for the installation and maintenance of the rubber membrane, and the air hole 71 compensates for the external airflow above the rubber membrane, so that the diaphragm can operate stably. The air hole 71 with a bent angle can prevent larger external debris from climbing into the air cavity 12. If too much dust and other dirt accumulate on the rubber membrane, the rubber membrane will be further concave due to gravity, and the pressure chamber 14 will be pressurized during the concave process, and the water leakage prevention ability will be improved over time.

[0038] As another embodiment further provided by the present invention, a discharge hole 18 vertically connected to the pressure chamber 14 is formed on the pump housing 1 .

[0039] Specifically, such as Figure 4 As shown, the drain hole 18 is located below the table-shaped protrusion, and a sealing plug (a threaded cylindrical knob and a rubber block at the end for sealing) is screwed into the lower end of the drain hole 18 to open and close the drain hole 18.

[0040] The water in the pressure chamber 14 is released by opening the drain hole 18 to periodically clean the leaked water and empty the water stored in the pressure chamber 14 to ensure long-term stable operation of the sealing position.

[0041] As another embodiment further provided by the present invention, a collar 44 located outside the sleeve 43 is provided at the end of the impeller cylinder 4, and an annular chamber 61 for the collar 44 to be embedded and slide is provided in the pump casing 1.

[0042] Specifically, a clamp sleeve 42 located outside the casing 32 is fixedly installed at the end of the impeller tube 4 , and an annular groove for installing the sleeve seal 43 is opened on the inner wall of the clamp sleeve 42 , and the collar 44 is arranged outside the clamp sleeve 42 .

[0043] Furthermore, the thickened inner wall of the pump casing 1 is installed with a sleeve 6 with a right-angled trapezoidal cross-section, and an annular chamber 61 is opened at the end of the sleeve 6, so that after the ring 44 and the annular chamber 61 are connected, the storage cavity 16 of the inner circle of the sleeve 6 can be blocked, thereby reducing the leakage of water into the storage cavity 16.

[0044] After the ring 44 is inserted into the annular chamber 61, the connection between the two forms a sealed shield for the clamp sleeve 42, and a gap required for rotation is left between the outer wall of the clamp sleeve 42 and the inner wall of the stage sleeve 6, but the shielding and sealing ability still keeps the internal environment of the storage chamber 16 stable during rotation.

[0045] As another embodiment further provided by the present invention, an external thread 33 is provided on the side wall of the sleeve 3, and the inner wall of the impeller cylinder 4 is threadedly movable with the external thread 33, and the collar 44 is axially moved to a predetermined position and then locked.

[0046] Specifically, such as Figure 5As shown, the external thread 33 provides a rightward thrust to the impeller cylinder 4 when the shaft 2 rotates, that is, when the external thread 33 and the inner wall of the impeller cylinder 4 are threadedly connected, the impeller cylinder 4 is pushed by the thread to spirally move toward the sleeve 6.

[0047] After the impeller barrel 4 is pre-installed on the shaft sleeve 3, the inner wall of the impeller barrel 4 and the external thread 33 are fully coupled. After the shaft sleeve 3 and the rotating shaft 2 are installed, the rotating shaft 2 is started, and the external thread 33 actively releases the coupling with the impeller barrel 4, so that the impeller barrel 4 is driven to move axially spirally (at this time, the impeller barrel 4 does not rotate and the shaft sleeve 3 is in idling), and is tightened in the annular chamber 61 (at this time, the impeller barrel 4 and the external thread 33 are still coupled), so that the impeller barrel 4 can no longer move axially and can only be driven to rotate by the shaft sleeve 3 (at this time, the impeller barrel 4 and the shaft sleeve 3 are formed into one body, and the implementation principle is: there are axial force and rotational force at the same time during the coupling process, but the axial force fails due to tightening, and the rotational force still exists, so the rotational force will drive the impeller barrel 4 to rotate (similar to the diaphragm spring tightening transmission of the clutch plate of a car engine)), so that the shaft sleeve 3 drives the blades 41 to transport water, but also reserves an axial path for the impeller barrel 4.

[0048] As another embodiment further provided by the present invention, an elastic member 63 is provided in the annular chamber 61 and contacts the end of the collar 44 , and the elastic member 63 is compressed to maintain maximum deformation in the locked state.

[0049] Specifically, the elastic member 63 is a spring, and after the elastic member 63 is fully compressed, there is still a gap between the pitches thereof. An annular piece 62 is welded to the end of the elastic member 63 , and the other end of the elastic member 63 maintains contact with the inner wall of the annular chamber 61 .

[0050] Furthermore, a plurality of spherical grooves are formed at the end of the collar 44 , and metal balls rotate in the grooves. The purpose is to utilize the metal balls to achieve rolling connection with the ring piece 62 , thereby reducing the friction force when the impeller cylinder 4 rotates.

[0051] The impeller cylinder 4 is driven to spiral into the annular chamber 61 through the collar 44, and the metal ball and the ring piece 62 are in conflict with each other. During the process, the elastic member 63 is deformed to the maximum, and the impeller cylinder 4 is tightened after the axial movement is satisfied and cannot continue to move axially, so that when the rotating shaft 2 is switched to the working speed, the impeller cylinder 4 is driven to rotate and transport water, and the rotating shaft 2 is maintained at the working speed (400-1800 rpm). The sleeve 3 will always apply force to the impeller cylinder 4, that is, it will always apply force to the elastic member 63, so the impeller cylinder 4 will maintain stability in an integrated connection when the rotating shaft 2 is working; and when the rotating shaft 2 slowly stops (returns to the original starting speed (0-100 rpm)), the restoring force of the elastic member 63 will be greater than the shaft The rotation of the sleeve 3 gives the impeller tube 4 a thrust for spiral movement, and in the process of the elastic member 63 recovering its deformation, it pushes the impeller tube 4 against the reverse thread on the external thread 33, so that the impeller tube 4 spirals back and away from the sleeve 6. At this time, multiple blades 41 push the water in the pump casing 1 in a spiral manner, thereby stirring the water in the pump casing 1, and offsetting the energy of the water hammer shock wave entering the pump casing 1 through the turbulent flow of the water flow, reducing the stress damage to the blades 41. Under the premise that water stirring sludge particles is inevitable, after the above-mentioned efficient sealing of the rotating position of the rotating shaft 2, there is no need to worry about the damage to the sealing position caused by sludge particles. Therefore, this method can effectively meet the protection of the impeller and ensure the service life of the blades 41.

[0052] As another embodiment further provided by the present invention, a drainage cone 30 is provided at the end of the sleeve 3 , and a drainage recess 301 cooperating with the adjacent blades 41 is formed on the drainage cone 30 .

[0053] Specifically, the drainage cone 30 is integrally formed at the end of the sleeve 3, as shown in FIG. Figure 10 As shown, in the default state, the drainage recess 301 is located between the gaps of the two blades 41 (in the axial direction), and the number of drainage recesses 301 corresponds to the number of blades 41, and the drainage recess 301 has the same recess as the working surface of the blade 41, and the inclination angle of the blade 41, the recess degree and the spacing setting are all existing technologies and will not be described here.

[0054] By flushing all the water toward the blades 41 through the water inlet and guiding it through the drainage recess 301, part of the water flow can be guided between the two blades 41, and the direct impact of sludge particles on the blades 41 can be reduced, thereby reducing the damage caused by direct impact on the blades 41 and improving the service life and safety of the blades 41.

[0055] As another embodiment further provided by the present invention, the threaded movable lower impeller cylinder 4 enables the blades 41 and the drainage recess 301 to move toward each other.

[0056] The impeller cylinder 4 moves in the opposite direction on the shaft sleeve 3, so that the back surface of the blade 41 is transformed into the working surface, and the relative position with respect to the drainage recess 301 is changed, so that the blade 41 is gradually located on the same horizontal line with the drainage recess 301 (the distance between the two drainage recesses 301 is connected and corresponds to the distance between the two blades 41). Therefore, in the process of the blade 41 stirring the water in the opposite direction, the guidance of the drainage recess 301 on the water flow is lost or weakened, and the water is stirred more randomly, so that the ability to offset and reduce the water hammer effect is improved.

[0057] Working principle: The casing 32 can clamp and shield a section of the rotating shaft 2 in the pump casing 1 to prevent water from eroding the rotating shaft 2. The sleeve seal 43 seals the water seepage gap outside the casing 32, reducing water from seeping into the storage chamber 16, while also increasing the blocking and protection capability of the outside of the casing 32. The combination of the threaded bevel 34 and the spiral blade 5 can achieve threaded sealing, and multiple annular grooves 17 are located on the outside of the threaded bevel 34, which can achieve labyrinth sealing. With the support of the two sealing functions, the possibility of water seeping into the storage chamber 16 continuing to leak behind the threaded bevel 34 is greatly reduced, and the threaded bevel 34 also has a pressure chamber 14 to temporarily store and isolate the leaked water, and the impeller tube 4 is used to spirally move under the action of the elastic member 63 to restore the deformation, and generate a piston action to draw the leaked water in the pressure chamber 14 back to the front of the threaded bevel 34, so that the leaked water needs to pass through two seals again, increasing the difficulty of water seepage and leakage. Finally, there is the shaft seal 35 to provide a bottom line, so that the water in the pump casing 1 is extremely unlikely to leak outward.

[0058] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A high-sealing mixed flow pump based on hydropower generation, characterized in that: The invention comprises a pump housing (1) with an axial hole and a rotating shaft (2) for rotation, wherein a screw blade (5) is fixedly installed in the axial hole, and an annular groove (17) is formed between the threads of the screw blade (5), and further comprises: A shaft sleeve (3) is threadedly connected to the end of the rotating shaft (2), and is provided with a protective tube (32) located outside the rotating shaft (2) and located at the inner diameter of the screw blade (5); An impeller cylinder (4) having blades (41) arranged circumferentially on its side wall, an inner wall of which is provided with a sleeve seal (43) that slides axially with the outer wall of the casing (32), and: The outer wall of the casing (32) is further provided with a threaded oblique strip (34) that matches the screw blade (5) and is arranged opposite to the annular groove (17); A storage chamber (16) is provided on one side of the threaded bevel strip (34), and a pressure chamber (14) connected to the storage chamber (16) is provided on the other side, and the lower seal (43) is moved to create a negative pressure in the storage chamber (16).

2. A high-sealing mixed flow pump based on hydropower generation according to claim 1, characterized in that: The pump housing (1) is provided with a spiral cone (13) located outside a plurality of annular grooves (17), wherein: The inner diameter of the spiral cone (13) is gradually changed, and the end with the smallest inner diameter is connected to the pressure chamber (14).

3. A high-sealing mixed flow pump based on hydropower generation according to claim 2, characterized in that: The pump housing (1) is provided with an air cavity (12) that is connected to the end portion with the maximum inner diameter of the spiral cone (13).

4. A high-sealing mixed flow pump based on hydropower generation according to claim 3, characterized in that: The air cavity (12) has an opening, and a cover (7) is fixedly mounted on the opening. The cover (7) is provided with an air hole (71) for supplying air into the air cavity (12).

5. A high-sealing mixed flow pump based on hydropower generation according to claim 3, characterized in that: The pump housing (1) is provided with a discharge hole (18) vertically connected to the pressure chamber (14).

6. A high-sealing mixed flow pump based on hydropower generation according to claim 3, characterized in that: The end of the impeller cylinder (4) is provided with a collar (44) located outside the sleeve seal (43), and the pump housing (1) is provided with an annular chamber (61) for embedding the collar (44) for sliding.

7. A high-sealing mixed flow pump based on hydropower generation according to claim 6, characterized in that: An external thread (33) is provided on the side wall of the shaft sleeve (3), and the inner wall of the impeller cylinder (4) is threadably movable with the external thread (33), and the collar (44) is locked after being axially moved to a predetermined position.

8. A high-sealing mixed flow pump based on hydropower generation according to claim 7, characterized in that: An elastic member (63) is provided in the annular chamber (61) and is in contact with the end of the collar (44), and the elastic member (63) is compressed to maintain maximum deformation in the locked state.

9. A high-sealing mixed flow pump based on hydropower generation according to claim 7, characterized in that: A drainage cone (30) is provided at the end of the shaft sleeve (3), and a drainage recess (301) is provided on the drainage cone (30) for cooperating with adjacent blades (41).

10. A high-sealing mixed flow pump based on hydropower generation according to claim 9, characterized in that: The impeller cylinder (4) moves in a threaded manner so that the blades (41) and the drainage recess (301) move toward each other.

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