Mixed flow pump impeller structure and mixed flow pump

Abstract

The present invention discloses a mixed flow pump impeller structure and a mixed flow pump, which relate to the technical field of mixed flow pumps and include an impeller body, the impeller body including a spherical shell, an intermediate rod, a vertical pump shell, and a plurality of blades; the spherical surface of the spherical shell is provided with two aligned spline grooves, and the center line connecting the two spline grooves passes through the center of the spherical shell; the middle position of the intermediate rod is provided with an annular groove, and the annular groove is located inside the spherical shell, and the upper and lower sides of the annular groove are provided with a second spline shaft integral with the intermediate rod. The two ends of the impeller blades of the present invention respectively form two angles with the entire central axis, and the two angles are unequal. When operating in a low flow mode, the blades are placed at a large angle with the central axis at the inlet of the entire impeller. When operating in a high flow mode, a replacement mechanism at the center of the impeller replaces the upper and lower ends of the blades, so that the blades form a small angle with the central axis at the inlet of the entire impeller.

Description

Technical Field

[0001] The present invention relates to the technical field of mixed flow pumps, and in particular to a mixed flow pump impeller structure and a mixed flow pump. Background Art

[0002] A mixed flow pump is a type of pump between a centrifugal pump and an axial flow pump. Its specific speed is higher than that of a centrifugal pump but lower than that of an axial flow pump. Its head is higher than that of an axial flow pump, but its flow rate is lower than that of an axial flow pump and higher than that of a centrifugal pump.

[0003] After searching, the patent document with the publication (announcement) number CN213144861U discloses a mixed flow pump impeller structure, which relates to the technical field of mixed flow pumps. The bottom end of the structure body is provided with an upper cover, the top end of the upper cover is provided with a raised inlet, the outer wall of the raised inlet is provided with a bottom centrifugal impeller, the raised inlet and the upper cover are provided with connecting holes, the connecting hole is provided with an axis, the bottom end of the axis is provided with a limit nut, the top end of the axis is provided with a top centrifugal impeller, the interior of the upper cover is provided with an internal centrifugal impeller, and there is an arc groove between the internal centrifugal impellers. The bottom centrifugal impeller includes a blade, one end of the blade is provided with a blade edge, the blade is provided with a fastening screw hole, the blade edge is provided with a blade threaded hole, the top end of the blade is provided with a second outer wall layer, and the bottom end of the blade is provided with a first outer wall layer. The patent provides a top centrifugal impeller, a bottom centrifugal impeller and an internal centrifugal impeller, which greatly improves the working efficiency of the mixed flow pump and improves the performance of the submersible mixed flow pump.

[0004] Based on the search and existing technology, it was found that the blade angle of the impeller of the mixed flow pump is fixed, so it can only be used in a high flow or low flow working mode. In the low flow mode, the existing technology generally sets the blade angle at the impeller inlet to be larger, while in the high flow mode, the existing technology generally sets the blade angle at the impeller inlet to be smaller. Switching between the two modes can only replace the impeller, and the disassembly process is relatively cumbersome, which will affect the progress of the entire work process. Summary of the Invention

[0005] The object of the present invention is to provide a mixed flow pump impeller structure and a mixed flow pump to solve the problems raised in the above background technology.

[0006] The technical solution of the present invention is: a mixed flow pump impeller structure, comprising an impeller body, wherein the impeller body comprises a spherical shell, an intermediate rod and a plurality of blades;

[0007] The spherical surface of the spherical shell is provided with two aligned spline grooves, and the center line connecting the two spline grooves passes through the center of the spherical shell;

[0008] An annular groove is provided at the middle position of the intermediate rod, and the annular groove is located inside the spherical shell;

[0009] A second spline shaft integrally formed with the intermediate rod is provided on both the upper and lower sides of the annular groove, and the two second spline shafts are slidably inserted into the two spline grooves respectively;

[0010] The blade is a curved fan-shaped piece, a square rod is fixed at the middle position of the inner arc edge of the blade, a ball head is fixed at one end of the square rod, and a limit block is fixed on the outer side of the square rod;

[0011] The spherical surface of the spherical shell is provided with a plurality of sliding grooves distributed in an annular manner with equal distances, and the square rod is slidably arranged in the sliding grooves and contacts the inner wall of the sliding grooves;

[0012] The ball head is integrally embedded in the annular groove;

[0013] The inner arc edge of the blade can fit with the spherical surface of the spherical shell, and the blade is arranged obliquely on the spherical shell, and the limit block on the square rod contacts the inner spherical surface of the spherical shell;

[0014] Both ends of the blade are bent, and the two ends of the blade and the central axis of the middle rod form two unequal angles.

[0015] The present invention also provides a mixed flow pump, including the above-mentioned mixed flow pump impeller structure, and also including a vertical pump casing, the impeller body is arranged as a whole inside the vertical pump casing, the interior of the vertical pump casing is provided with a replacement mechanism for flipping the impeller body up and down, and the top of the vertical pump casing is provided with a drive assembly for rotating the intermediate rod.

[0016] Preferably, the replacement mechanism includes a rotating ring, two aligned rotating shafts are fixed to the outside of the rotating ring, the central axes of the two rotating shafts pass through the center of the rotating ring, the two ends of the rotating shaft are respectively rotatably mounted on both sides of the vertical pump casing, and a rotating component for rotating the rotating ring is provided on the outside of the vertical pump casing.

[0017] Preferably, the rotating assembly includes a servo motor, a worm, a worm wheel and two support plates, one end of each of the support plates is fixed to the outside of the vertical pump casing, a first rotating hole is opened on the outside of each of the support plates, both ends of the worm are rotatably installed in the two first rotating holes, the worm wheel is coaxially fixed with one of the rotating shafts, the worm is meshed with the worm wheel, the servo motor is fixed to one of the support plates, and the output shaft of the servo motor is coaxially fixed with the worm.

[0018] Preferably, sliding holes are provided at the top and bottom of the rotating ring, and the two ends of the intermediate rod pass through the two sliding holes respectively. Rotating sleeves are rotatably installed at both ends of the intermediate rod, and contact wheels are rotatably installed on both sides of the rotating sleeve. Limiting plates are fixed at the top and bottom of the rotating ring, and straight slots are provided on the outer side of the limiting plates. The wheel axles of the four contact wheels are respectively slidably set in the straight slots.

[0019] Preferably, guide plates are fixed on both sides of the interior of the vertical pump housing, the cross section of the guide plates is in an inverted "︺" shape, and the guide plates are located on the top of the rotating ring.

[0020] Preferably, the drive assembly includes a fixed cylinder, one end of which is fixed on the vertical pump casing and is vertically arranged, the fixed cylinder is communicated with the vertical pump casing, a transmission rod is slidingly arranged inside the fixed cylinder, the transmission rod is provided with a first spline sleeve with an integral structure therewith, and both ends of the intermediate rod are provided with a third spline shaft coaxially arranged and integrally arranged therewith, and the third spline shaft is adapted to the first spline sleeve.

[0021] Preferably, the drive assembly also includes an electric push rod, which is fixed to the fixed cylinder, and a connecting plate is provided between the telescopic end of the electric push rod and the transmission rod to connect the two. The telescopic end of the electric push rod is fixed to the connecting plate, and the transmission rod and the connecting plate form a rotational fit.

[0022] Preferably, the drive assembly also includes a fixing bracket, the bottom of the fixing bracket is fixed to the outside of the vertical pump casing, the top of the fixing bracket is provided with a second rotating hole, the second rotating hole is coaxially arranged with the transmission rod, an input rod is rotatably installed inside the second rotating hole, the bottom end of the input rod is provided with a first spline shaft coaxially arranged therewith, and the transmission rod is located at one end outside the vertical pump casing and is provided with a second spline sleeve adapted to the first spline shaft, and one end of the first spline shaft is slidably inserted into the second spline sleeve.

[0023] Preferably, a coupling coaxially arranged therewith is fixed to the top end of the input rod.

[0024] The present invention provides a mixed flow pump impeller structure and a mixed flow pump through improvements, which have the following improvements and advantages compared with the prior art:

[0025] First, the two ends of the impeller blades of the present invention form two angles with the entire central axis respectively, and the two angles are not equal. When operating in a low-flow mode, the blades are placed at the inlet of the entire impeller at a large angle with the central axis. When operating in a high-flow mode, the replacement mechanism at the center of the impeller replaces the upper and lower ends of the blades, so that the blades form a small angle with the central axis and are placed at the inlet of the entire impeller.

[0026] Secondly, the present invention will change the lift accordingly during the switching process between the two working modes. In the existing technology, in the low-flow working mode, the blades form a large angle with the central axis, which makes the angle between the water outlet end of the blades and the horizontal plane smaller, making the outlet water pressure larger, so the lift becomes larger. In the high-flow working mode, on the contrary, since the two ends of the impeller blades of the present invention form two unequal angles with the entire central axis, in the existing technology, the lift height is positively correlated with the pressure at the impeller outlet. In the low-flow mode, the angle formed by the blades and the central axis at the inlet is larger (the angle formed by the horizontal plane is smaller), which is the water inlet angle. When the speed remains unchanged, the water inlet angle is larger, and the distance between the bottom ends of each adjacent blade is smaller. At this time, the water inlet volume is reduced, the water pressure of the water inlet increases, and the subsequent lift will become larger. However, in the low-flow mode, the blades and the central axis of the inlet are larger (the angle formed by the horizontal plane is smaller). The angle formed by the working horizontal plane at the outlet is larger (the distance between the top ends of each adjacent blade is larger), thereby releasing part of the water pressure and reducing the subsequent head. Under the high flow mode, when the speed remains unchanged, the angle formed by the blades and the central axis at the inlet is smaller (the angle formed by the horizontal plane is larger). This angle is the water inlet angle. When the speed remains unchanged, the water inlet angle is larger, and the distance between the bottom ends of each adjacent blade is larger. At this time, the water inlet volume increases, the water pressure of the inlet water decreases, and the subsequent head will become smaller. However, under the high flow mode, the angle formed by the blades and the working horizontal plane at the outlet is smaller (the distance between the top ends of each adjacent blade is smaller), thereby compressing the water outlet, increasing the water pressure at the water outlet, and increasing the subsequent head. It can be seen that the head of the entire mixed flow pump is in a stable range, and the head of the water outlet will not change significantly due to changes in flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the overall top area structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the overall internal structure of the present invention;

[0031] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at point A;

[0032] Figure 5 for Figure 3 A schematic diagram of the enlarged structure at point B;

[0033] Figure 6 This is a schematic diagram of the three-dimensional structure of the impeller body of the present invention;

[0034] Figure 7 Schematic diagram of the internal structure of the impeller body of the present invention;

[0035] Figure 8 Schematic diagram of the three-dimensional structure of the spherical shell of the present invention;

[0036] Figure 9 It is a schematic diagram of the three-dimensional structure of the blade of the present invention.

[0037] Reference numerals:

[0038] 1. Vertical pump casing; 2. Rotating assembly; 3. Fixed frame; 4. Fixed cylinder; 5. Electric push rod; 6. Connecting plate; 7. Transmission rod; 8. First spline shaft; 9. Input rod; 10. Rotating ring; 11. Rotating shaft; 12. Impeller body; 13. Rotating sleeve; 14. Contact wheel; 15. Guide plate; 16. Limit plate; 17. Straight slot; 18. Intermediate rod; 19. Worm gear; 20. Worm; 21. Servo motor; 22. Support plate; 23. Ball shell; 24. Blade; 25. Second spline shaft; 26. Sliding groove; 27. Square rod; 28. Ball head; 29. ​​Annular groove; 30. Spline groove; 31. Limit block; 32. Third spline shaft. DETAILED DESCRIPTION

[0039] The present invention is described in detail below, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] The present invention provides a mixed flow pump impeller structure and a mixed flow pump through improvement. The technical solution of the present invention is:

[0041] like Figures 1 to 9 As shown, an embodiment of the present invention provides a mixed flow pump impeller structure, including an impeller body 12, the impeller body 12 including a spherical shell 23, an intermediate rod 18 and a plurality of blades 24;

[0042] The spherical surface of the spherical shell 23 is provided with two aligned spline grooves 30, and the center line connecting the two spline grooves 30 passes through the center of the spherical shell 23;

[0043] An annular groove 29 is formed at the middle position of the middle rod 18, and the annular groove 29 is located inside the ball shell 23;

[0044] Second spline shafts 25 integrally formed with the intermediate rod 18 are provided on both the upper and lower sides of the annular groove 29, and the two second spline shafts 25 are slidably inserted into the two spline grooves 30, respectively. It can be seen that the intermediate rod 18 drives the entire spherical shell 23 to rotate through the second spline shafts 25;

[0045] The blade 24 is a curved sector-shaped piece. A square rod 27 is fixed at the middle position of the inner arc edge of the blade 24. A ball head 28 is fixed at one end of the square rod 27. A limit block 31 is fixed on the outer side of the square rod 27.

[0046] The spherical surface of the spherical shell 23 is provided with a plurality of equally spaced annular sliding grooves 26. The square rod 27 is slidably disposed in the sliding groove 26 and contacts the inner wall of the sliding groove 26. Therefore, it can be seen that the entire square rod 27 cannot rotate on the inner wall of the sliding groove 26.

[0047] The ball head 28 is integrally embedded in the annular groove 29 . Therefore, when the intermediate rod 18 slides up and down, the annular groove 29 on the intermediate rod 18 enables the square rod 27 to slide along the sliding groove 26 with the help of the ball head 28 .

[0048] The inner arc edge of the blade 24 can fit with the spherical surface of the spherical shell 23, and the blade 24 is arranged obliquely on the spherical shell 23. The stopper 31 on the square rod 27 contacts the inner spherical surface of the spherical shell 23. Therefore, it can be seen that the square rod 27 will not move forward and backward in the sliding groove 26.

[0049] Both ends of the blade 24 are bent, and the two ends of the blade 24 form two unequal angles with the central axis of the middle rod 18. Supplementary explanation is required here: the two ends of the blade 24 respectively form two angles with the entire central axis, and the two angles are unequal, one is a large angle, and the other is a small angle. According to the existing technology, the water inlet angle is set between 20 degrees and 45 degrees, which is used for low flow; the water inlet angle is set between 0 degrees and 15 degrees, which is used for high flow, so the large angle is set between 20 degrees and 45 degrees, and the small angle is set between 0 degrees and 15 degrees. The specific angle setting is not limited. Here, the large angle can be set to 40 degrees and the small angle is set to 10 degrees. In either mode, one end of the blade 24 is at the bottom of the spherical shell 23, so that the one ends of the blade 24 can be close to each other at the bottom of the spherical shell 23, and can be entangled in the water flow to the greatest extent.

[0050] From the above connection relationship, it can be seen that the two ends of the impeller blade 24 form two angles with the entire central axis respectively, and these two angles are not equal. When in low-flow working mode, the blade 24 forms a large angle with the central axis and is placed at the inlet of the entire impeller. When in high-flow working mode, the replacement mechanism at the center of the impeller replaces the upper and lower ends of the blade 24, so that the blade 24 forms a small angle with the central axis and is placed at the inlet of the entire impeller.

[0051] Combined with attachment Figure 1-6 As shown, the present invention also provides a mixed flow pump, including the above-mentioned mixed flow pump impeller structure, and also includes a vertical pump casing 1, the impeller body 12 is arranged as a whole inside the vertical pump casing 1, and a displacement mechanism for turning the impeller body 12 up and down is provided inside the vertical pump casing 1, and a driving component for rotating the intermediate rod 18 is provided at the top of the vertical pump casing 1.

[0052] Specifically, in conjunction with Figure 3 As shown, the displacement mechanism includes a rotating ring 10, and two aligned rotating shafts 11 are fixed to the outside of the rotating ring 10. The central axes of the two rotating shafts 11 pass through the center of the rotating ring 10, and the two ends of the rotating shaft 11 are rotatably mounted on both sides of the vertical pump casing 1. A rotating assembly 2 for rotating the rotating ring 10 is provided on the outside of the vertical pump casing 1; the rotating ring 10 can rotate axially inside the vertical pump casing 1 with the help of the rotating shaft 11.

[0053] Specifically, in conjunction with Figure 3 and attached Figure 5 As shown, the rotating assembly 2 includes a servo motor 21, a worm 20, a worm wheel 19 and two support plates 22. One end of the two support plates 22 is fixed to the outside of the vertical pump casing 1. A first rotating hole is opened on the outside of the two support plates 22. The two ends of the worm 20 are respectively rotatably installed in the two first rotating holes. The worm wheel 19 is coaxially fixed to one of the rotating shafts 11. The worm 20 is meshed with the worm wheel 19. The servo motor 21 is fixed to one of the support plates 22. The output shaft of the servo motor 21 is coaxially fixed to the worm 20. The servo motor 21 rotates the worm 20 through the output shaft. The worm 20 drives the worm wheel 19 to rotate. The worm wheel 19 drives the rotating shaft 11 fixed to it to rotate, and the rotating shaft 11 drives the rotating ring 10 to rotate.

[0054] Specifically, in conjunction with Figure 3 and attached Figure 4 As shown, sliding holes are provided at the top and bottom of the rotating ring 10, and both ends of the intermediate rod 18 pass through the two sliding holes respectively. Rotating sleeves 13 are rotatably installed at both ends of the intermediate rod 18, and contact wheels 14 are rotatably installed on both sides of the rotating sleeve 13. Limiting plates 16 are fixed at the top and bottom of the rotating ring 10, and straight slots 17 are provided on the outer side of the limiting plates 16. The axles of the four contact wheels 14 are slidably set in the straight slots 17 respectively; the intermediate rod 18 can rotate in the sliding holes, and the intermediate rod 18 can rotate in the rotating sleeve 13 at the same time. When the intermediate rod 18 slides, the rotating sleeve 13 on the intermediate rod 18 moves accordingly, and the axles of the contact wheels 14 on the rotating sleeve 13 rotate in the straight slots 17, thereby limiting the sliding range of the rotating sleeve 13, and the rotating sleeve 13 cannot rotate by itself.

[0055] Specifically, in conjunction with Figure 3 -Attached Figure 6 As shown, guide plates 15 are fixed on both sides of the interior of the vertical pump casing 1. The cross section of the guide plates 15 is in an inverted "︺" shape, and the guide plates 15 are located at the top of the rotating ring 10. When the rotating ring 10 rotates, the rotating sleeve 13 below rotates upward, and the contact wheel 14 on the rotating sleeve 13 contacts the guide plates 15. Since the cross section of the guide plates 15 is in an inverted "︺" shape, the contact wheel 14 pushes the rotating sleeve 13 to move upward, and the rotating sleeve 13 drives the intermediate rod 18 to move upward.

[0056] Specifically, in conjunction with Figure 3 -Attached Figure 6 As shown, the drive assembly includes a fixed cylinder 4, one end of which is fixed on the vertical pump casing 1 and is vertically arranged. The fixed cylinder 4 is communicated with the vertical pump casing 1, and a transmission rod 7 is slidingly arranged inside the fixed cylinder 4. The transmission rod 7 is provided with a first spline sleeve with an integral structure therewith, and both ends of the intermediate rod 18 are provided with a third spline shaft 32 which is coaxially arranged and integrally arranged therewith, and the third spline shaft 32 is adapted to the first spline sleeve; when the first spline sleeve on the transmission rod 7 is integrally sleeved on the third spline shaft 32 (if it is not normally inserted, the transmission rod 7 can be rotated, and there must be a moment when the first spline sleeve is integrally sleeved on the third spline shaft 32), the transmission rod 7 drives the third spline shaft 32 to rotate through the first spline sleeve, and the third spline shaft 32 drives the intermediate rod 18 to rotate.

[0057] Specifically, in conjunction with Figure 2 -Attached Figure 6 As shown, the drive assembly also includes an electric push rod 5, which is fixed to the fixed cylinder 4, and a connecting plate 6 is provided between the telescopic end of the electric push rod 5 and the transmission rod 7 to connect the two. The telescopic end of the electric push rod 5 is fixed to the connecting plate 6, and the transmission rod 7 forms a rotational fit with the connecting plate 6; the electric push rod 5 drives the connecting plate 6 to move up and down in the form of telescoping, and the connecting plate 6 drives the transmission rod 7 to move, and at the same time the transmission rod 7 can rotate on the connecting plate 6.

[0058] Specifically, in conjunction with Figure 2 -Attached Figure 6 As shown, the drive assembly also includes a fixed frame 3, the bottom of the fixed frame 3 is fixed to the outside of the vertical pump casing 1, and a second rotating hole is opened at the top of the fixed frame 3, which is coaxially arranged with the transmission rod 7. An input rod 9 is rotatably installed inside the second rotating hole, and a first spline shaft 8 coaxially arranged therewith is provided at the bottom end of the input rod 9. A second spline sleeve adapted to the first spline shaft 8 is provided at one end of the outer side of the vertical pump casing 1, and one end of the first spline shaft 8 is slidably inserted into the second spline sleeve, and a coupling coaxially arranged therewith is fixed to the top of the input rod 9; the input rod 9 drives the transmission rod 7 to rotate through the first spline shaft 8.

[0059] Working principle:

[0060] The two ends of the blade 24 form two angles with the entire central axis respectively. The two angles are not equal, one is a large angle and the other is a small angle. According to the existing technology, the water inlet angle is set between 20 degrees and 45 degrees, which is applied to low flow; the water inlet angle is set between 0 degrees and 15 degrees, which is applied to high flow. Therefore, the large angle is set to 20 degrees to 45 degrees, and the small angle is set to 0 degrees to 15 degrees. The specific angle setting is not limited. Here, the large angle can be set to 40 degrees and the small angle can be set to 10 degrees.

[0061] When switching working modes;

[0062] The electric push rod 5 extends, and the telescopic end of the electric push rod 5 pulls the transmission rod 7 upward through the connecting plate 6. At this time, the first spline sleeve on the transmission rod 7 and the third spline shaft 32 on the intermediate rod 18 are separated from each other;

[0063] Then, the servo motor 21 is started, which rotates the worm 20 via the output shaft. The worm 20 drives the worm wheel 19 to rotate. The worm wheel 19 drives the rotating shaft 11 fixed thereto to rotate. The rotating shaft 11 drives the rotating ring 10 to rotate, causing the rotating ring 10 to rotate 180 degrees.

[0064] When the rotating ring 10 rotates, the rotating sleeve 13 below rotates upward, and the contact wheel 14 on the rotating sleeve 13 contacts the guide plate 15. Since the cross section of the guide plate 15 is an inverted "︺" shape, the contact wheel 14 pushes the rotating sleeve 13 upward, and the rotating sleeve 13 drives the intermediate rod 18 upward;

[0065] The annular groove 29 on the middle rod 18 moves accordingly, and the annular groove 29 on the middle rod 18 uses the ball head 28 to make the square rod 27 slide along the sliding groove 26, so that the other end of the blade 24 is at the lower end of the ball shell 23, thereby completing the upper and lower replacement of the blade 24.

[0066] The above description is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mixed flow pump comprising an impeller body (12), characterized in that: The impeller body (12) includes a spherical shell (23), an intermediate rod (18), a vertical pump shell (1), and a plurality of blades (24); The spherical surface of the spherical shell (23) is provided with two aligned spline grooves (30), and the center line connecting the two spline grooves (30) passes through the center of the spherical shell (23); An annular groove (29) is provided at the middle position of the intermediate rod (18), and the annular groove (29) is located inside the spherical shell (23); A second spline shaft (25) integrally formed with the intermediate rod (18) is provided on both upper and lower sides of the annular groove (29), and the two second spline shafts (25) are slidably inserted into the two spline grooves (30) respectively; The blade (24) is a curved fan-shaped blade, a square rod (27) is fixed at the middle position of the inner arc edge of the blade (24), a ball head (28) is fixed at one end of the square rod (27), and a limit block (31) is fixed on the outer side of the square rod (27); The spherical surface of the spherical shell (23) is provided with a plurality of sliding grooves (26) distributed in an annular manner at equal distances, and the square rod (27) is slidably arranged in the sliding groove (26) and contacts the inner wall of the sliding groove (26); The ball head (28) is integrally and movably embedded in the annular groove (29); The inner arc edge of the blade (24) can fit with the spherical surface of the spherical shell (23), and the blade (24) is arranged on the spherical shell (23) at an angle, and the limit block (31) on the square rod (27) contacts the inner spherical surface of the spherical shell (23); Both ends of the blade (24) are bent, and the two ends of the blade (24) form two unequal angles with the central axis of the middle rod (18); The entire impeller body (12) is arranged inside the vertical pump casing (1), and a replacement mechanism for turning the impeller body (12) upside down is provided inside the vertical pump casing (1); The displacement mechanism comprises a rotating ring (10), two aligned rotating shafts (11) are fixed on the outer side of the rotating ring (10), the central axes of the two rotating shafts (11) pass through the center of the rotating ring (10), and the two ends of the rotating shaft (11) are rotatably mounted on the two sides of the vertical pump casing (1), and a rotating assembly (2) for rotating the rotating ring (10) is provided on the outer side of the vertical pump casing (1); The rotating assembly (2) includes a servo motor (21), a worm (20), a worm wheel (19) and two support plates (22), one end of each of the two support plates (22) is fixed to the outside of the vertical pump housing (1), a first rotating hole is opened on the outside of each of the two support plates (22), and both ends of the worm (20) are rotatably mounted in the two first rotating holes, the worm wheel (19) is coaxially fixed to one of the rotating shafts (11), the worm (20) is meshed with the worm wheel (19), the servo motor (21) is fixed to one of the support plates (22), and the output shaft of the servo motor (21) is coaxially fixed to the worm (20); The top and bottom of the rotating ring (10) are provided with sliding holes, and the two ends of the intermediate rod (18) pass through the two sliding holes respectively. The two ends of the intermediate rod (18) are rotatably mounted with rotating sleeves (13), and the two sides of the rotating sleeve (13) are rotatably mounted with contact wheels (14). The top and bottom of the rotating ring (10) are fixed with limit plates (16), and the outer side of the limit plates (16) is provided with straight slots (17). The wheel shafts of the four contact wheels (14) are respectively slidably arranged in the straight slots (17); Guide plates (15) are fixed to both sides of the interior of the vertical pump housing (1). The cross section of the guide plates (15) is in an inverted "︺" shape, and the guide plates (15) are located on the top of the rotating ring (10).

2. A mixed flow pump according to claim 1, characterized in that: Also included is a drive assembly for rotating the intermediate rod (18).

3. A mixed flow pump according to claim 2, characterized in that: The drive assembly comprises a fixed cylinder (4), one end of which is fixed on the vertical pump housing (1) and is arranged vertically, the fixed cylinder (4) is connected to the vertical pump housing (1), a transmission rod (7) is slidably arranged inside the fixed cylinder (4), and the transmission rod (7) is provided with a first spline sleeve with an integral structure therewith, and both ends of the intermediate rod (18) are provided with a third spline shaft (32) coaxially arranged therewith and with an integral structure therewith, and the third spline shaft (32) is adapted to the first spline sleeve.

4. A mixed flow pump according to claim 3, characterized in that: The drive assembly further comprises an electric push rod (5), the electric push rod (5) being fixed to the fixed cylinder (4), a connecting plate (6) being provided between the telescopic end of the electric push rod (5) and the transmission rod (7) for connecting the two, the telescopic end of the electric push rod (5) being fixed to the connecting plate (6), and the transmission rod (7) and the connecting plate (6) forming a rotational fit.

5. A mixed flow pump according to claim 4, characterized in that: The drive assembly further comprises a fixing frame (3), the bottom of the fixing frame (3) being fixed to the outside of the vertical pump housing (1), the top of the fixing frame (3) being provided with a second rotation hole, the second rotation hole being coaxially arranged with the transmission rod (7), an input rod (9) being rotatably mounted inside the second rotation hole, the bottom end of the input rod (9) being provided with a first spline shaft (8) coaxially arranged therewith, a second spline sleeve being provided at one end of the transmission rod (7) located on the outside of the vertical pump housing (1) and being adapted to the first spline shaft (8), and one end of the first spline shaft (8) being slidably inserted into the second spline sleeve.

6. A mixed flow pump according to claim 5, characterized in that: A coupling coaxially arranged therewith is fixed to the top end of the input rod (9).

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