An inclined axial flow pump with a mechanical blade angle adjusting mechanism

Abstract

The present application relates to the technical field of axial flow pump, in particular to a inclined axial flow pump with mechanical blade angle adjusting mechanism, which comprises a pump pipe assembly, the pump pipe assembly is provided with a mounting seat, and a pump shaft is rotatably installed in the mounting seat, one end of the pump shaft is provided with an impeller mechanism, and the adjusting mechanism is arranged at the other end of the pump shaft and used for adjusting the impeller mechanism; the contact position of the mounting seat and the pump shaft forms a gas compression ring gap; the adjusting mechanism comprises a screw rod group with self-locking function. The adjusting tile is driven to move the transmission disc and the central pipe, and the transmission screw pipe can be driven to rotate, so that the adjusting rod is driven to move along the axial direction, the angle of the blade is adjusted, the previous hydraulic blade adjusting mode is changed, and the influence caused by hydraulic oil leakage can be completely eliminated. In addition, when the transmission disc rotates with the pump shaft, the positive pressure gas can be pumped into the gas compression ring gap position through the cooperation of the gas compression assembly and the adjusting tile.

Description

Technical Field

[0001] This invention relates to the field of axial flow pump technology, specifically to an inclined axial flow pump with a mechanical blade angle adjustment mechanism. Background Technology

[0002] Axial flow pumps rely on the force generated by a rotating impeller on a liquid to transport the liquid along its axis. They mainly consist of a pump body assembly, impeller, pump shaft, fixed guide vanes, guide bearings, coupling, and drive motor. Based on the installation method, they are mainly divided into vertical, horizontal, and inclined axial flow pumps. Inclined axial flow pumps have their pump shaft installed at an angle relative to the mounting surface, commonly 15°, 30°, and 45°, combining characteristics of vertical and horizontal pumps, with a split-case pump body structure. Adjustable axial flow pumps can maintain high efficiency and stable operation over a wide range of operating conditions simply by changing the impeller installation angle. Fully adjustable impeller axial flow pumps are typically hydraulically driven.

[0003] For example, patent CN119641645B discloses a blade angle adjustment device and an axial flow pump for an axial flow pump. The device includes an impeller hub, a guide shroud fixedly mounted at the bottom of the impeller hub, and a fixing bracket inserted into the impeller hub fixedly mounted on the top of the inner wall of the guide shroud. The impeller hub has first mounting holes evenly spaced in a ring around its circumference, and each first mounting hole has a steering shaft connected to its inner wall via a sealed bearing. Pump blades are fixedly mounted at one end of each steering shaft, and a steering gear is fixedly mounted at the other end of the steering shaft extending into the impeller hub. A hydraulic cylinder is fixedly mounted at the bottom of the fixing bracket, and a lifting plate is fixedly mounted at the piston end of the hydraulic cylinder. L-shaped racks evenly spaced in a ring are fixedly mounted on the circumference of the lifting plate, with one side of each L-shaped rack meshing with the outer wall of the steering gear. The angle of the pump blades is controlled by adjusting the stroke of the hydraulic cylinder piston to adapt to different operating conditions.

[0004] In the prior art of the aforementioned patent, the blade angle is adjusted by a hydraulic cylinder. In order to supply hydraulic oil to the hydraulic cylinder, an oil receiver for oil supply needs to be installed on the pump shaft. However, the oil receiver inlet pipe seal is difficult to achieve a complete seal due to the limitation of dynamic and static contact, which makes it impossible to design the working pressure too high. As a result, it is difficult to achieve stable adjustment of the blades of a large-diameter axial flow pump. Therefore, there is an urgent need for a slanted axial flow pump with a mechanical blade angle adjustment mechanism to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an inclined axial flow pump with a mechanical blade angle adjustment mechanism to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an inclined axial flow pump with a mechanical blade angle adjustment mechanism, comprising a pump tube assembly, a mounting base provided on the pump tube assembly, and a pump shaft rotatably mounted in the mounting base, an impeller mechanism provided at one end of the pump shaft, and an adjustment mechanism provided at the other end of the pump shaft for adjusting the impeller mechanism; the contact position between the mounting base and the pump shaft forms a pressure annular gap;

[0007] The adjusting mechanism includes a screw assembly with a self-locking function, which is connected to the impeller mechanism in a transmission manner; a transmission disc, which is fitted outside the screw assembly and can rotate with the pump shaft, and a compressed air assembly is provided on the transmission disc; and an adjusting plate, which is snapped onto the outside of the transmission disc.

[0008] When the regulating plate is driven to move the transmission disc, the impeller mechanism is self-locked and adjusted through the screw assembly. When the transmission disc rotates with the pump shaft, the air compression components on the transmission disc are engaged with the regulating plate one by one to compress the air and force the airflow into the air compression ring gap.

[0009] Preferably, the impeller mechanism is located at one end of the pump shaft inside the pump tube assembly, and includes an impeller seat with blades rotatably mounted on the periphery of the impeller seat; an adjusting rod passing through the middle of the impeller seat; and a transmission assembly located inside the impeller seat. When the adjusting rod is driven to move axially, the angle of the blades is adjusted by transmission through the transmission assembly.

[0010] Preferably, the mounting base is filled with sealing packing that mates with the pump shaft, the adjusting rod passes through the middle of the pump shaft, the adjusting rod has an exhaust groove, the pump shaft has an exhaust inclined hole, and the exhaust groove communicates with the air pressure ring through the exhaust inclined hole.

[0011] Preferably, the adjusting mechanism is located at one end of the pump shaft outside the pump pipe assembly, and includes a connecting cage for restricting the position of the transmission disc so that the transmission disc rotates with the pump shaft, and the screw assembly is located in the middle of the connecting cage.

[0012] Preferably, the screw assembly includes a transmission screw tube rotatably mounted on the connecting cage, a central tube disposed in the middle of the transmission disc, and an external thread formed outside the adjusting rod. The transmission screw tube and the adjusting rod are threadedly connected, and the central tube and the transmission screw tube are helically connected.

[0013] Preferably, the top and bottom of the transmission disc are provided with air compression components. When the transmission disc drives the air compression components to rotate towards the adjusting tile position, the air compression components can be compressed by the adjusting tile to compress air.

[0014] Preferably, the adjusting plate is arc-shaped as a whole, and both ends of the adjusting plate are provided with guide parts that cooperate with the air compression assembly.

[0015] Preferably, the transmission disc and the connecting cage are provided with an air passage communicating with the air compressor assembly for supplying air to the adjusting rod.

[0016] Preferably, the bottom end of the transmission solenoid is bonded with a lower annular airbag, and the inside of the connecting cage is provided with an air top assembly. The air top assembly is opened by the airflow and can inflate the lower annular airbag.

[0017] Preferably, the air-support assembly includes a fixedly connected ring seat and an upper annular airbag, and the transmission solenoid and the ring seat have interconnected air passages inside, with the upper annular airbag communicating with the lower annular airbag through the air passages.

[0018] In the above technical solution, the beneficial effects of the present invention are as follows: the adjusting pad is driven to move the transmission disc and the central tube, which can drive the transmission solenoid to rotate, thereby driving the adjusting rod to move axially and adjusting the angle of the blades. This changes the previous method of adjusting the blades by hydraulic pressure, thus completely eliminating the impact of hydraulic oil leakage. In addition, when the transmission disc rotates with the pump shaft, positive pressure gas can be pumped into the position of the compressed air ring gap through the cooperation of the compressed air assembly and the adjusting pad, forming an airflow that is discharged to one end of the mounting base. The positive pressure airflow helps to seal the contact position between the pump shaft and the mounting base, thereby significantly shortening the arrangement length of the sealing packing, reducing the frictional resistance of the sealing packing to the pump shaft, and reducing energy consumption.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0020] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall assembled structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the pump tube assembly of the present invention;

[0024] Figure 3 This is a schematic diagram of the overall structure of the impeller mechanism of the present invention;

[0025] Figure 4This is a schematic diagram of the cross-sectional structure of the mounting base of the present invention;

[0026] Figure 5 This is a schematic diagram of the overall structure of the adjustment mechanism of the present invention;

[0027] Figure 6 This is a schematic diagram of the connection between the adjusting mechanism and the pump shaft of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the transmission disc and the adjusting plate of the present invention.

[0029] Figure 8 This is a schematic diagram of the cross-sectional structure of the air compressor assembly of the present invention;

[0030] Figure 9 This is a schematic diagram of the connection between the cage frame and the transmission disc in this invention;

[0031] Figure 10 This is a schematic diagram of the cross-sectional structure of the transmission solenoid of the present invention;

[0032] Figure 11 For the present invention Figure 10 An enlarged structural diagram of point A.

[0033] Explanation of reference numerals in the attached figures:

[0034] In the diagram: 1. Pump pipe assembly; 2. Pump shaft; 3. Impeller mechanism; 31. Impeller seat; 32. Adjusting rod; 33. Transmission frame; 34. Connecting rod; 35. Crank arm; 36. Pivot; 37. Blade; 38. Draft shield; 4. Guide vane; 5. Mounting base; 6. Adjusting mechanism; 61. Electric push rod; 62. Adjusting shoe; 63. Connecting cage; 631. Lower connecting plate; 632. Upper connecting plate; 633. Connecting rod; 64. Transmission disc. 65. Central tube; 66. Transmission solenoid; 67. Compressed air assembly; 671. Compressed air seat; 672. Compressed air piston; 673. Return spring; 68. Miniature one-way air valve; 69. Air top assembly; 691. Air top shell; 692. Elastic push rod; 693. Ring seat; 694. Upper annular air bladder; 610. Lower annular air bladder; 611. Exhaust groove; 612. Exhaust oblique hole; 7. Sealing packing; 8. Guide bearing; 9. Compressed air ring seam. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0036] Please see Figure 1-11 This invention provides a technical solution: an inclined axial flow pump with a mechanical blade angle adjustment mechanism, comprising a pump pipe assembly 1, a mounting base 5 on the pump pipe assembly 1, and a pump shaft 2 rotatably mounted in the mounting base 5. One end of the pump shaft 2 is provided with an impeller mechanism 3, and an adjustment mechanism 6 is also provided at the other end of the pump shaft 2 for adjusting the impeller mechanism 3; the contact position between the mounting base 5 and the pump shaft 2 forms a pressure annular gap 9;

[0037] The regulating mechanism 6 includes a screw assembly with a self-locking function, which is connected to the impeller mechanism 3 in a transmission manner; a transmission disc 64, which is fitted outside the screw assembly and can rotate with the pump shaft 2, and a compressed air assembly 67 is provided on the transmission disc 64; and an regulating pad 62, which is snapped onto the outside of the transmission disc 64.

[0038] When the regulating plate 62 is driven to move the transmission plate 64, the impeller mechanism 3 is self-locked and adjusted through the screw assembly. When the transmission plate 64 rotates with the pump shaft 2, the air compression components 67 on the transmission plate 64 are engaged with the regulating plate 62 one by one to compress the air and force the airflow into the air compression ring 9.

[0039] The pump pipe assembly 1 consists of a spliced ​​pipe body and a bell mouth fixedly installed at the bottom of the pipe body. The impeller mechanism 3 is located inside the pump pipe assembly 1 near the bell mouth. The pump pipe assembly 1 is provided with a guide vane 4 located on the upper edge of the impeller mechanism 3, which is used to guide the flow direction of the fluid, control the flow rate and pressure, improve energy conversion efficiency, or adjust system performance.

[0040] Specifically, when adjusting the impeller mechanism 3, the adjusting plate 62 is driven to move the transmission plate 64 along the pump shaft 2 axially. When the transmission plate 64 moves, it is driven by the screw assembly to adjust the impeller mechanism 3. The screw assembly has a self-locking capability, so that the impeller mechanism 3 has a self-locking effect after adjustment. When the pump shaft 2 is working, it drives the transmission plate 64 to rotate synchronously. Several air compression components 67 on the transmission plate 64 are locked into the adjusting plate 62 one by one. The air compression components 67 are squeezed by the adjusting plate 62 to force air into the air compression ring 9. When the pump shaft 2 is continuously rotating, it drives the transmission plate 64 to rotate continuously, thereby realizing continuous air supply to the air compression ring 9. This causes the air compression ring 9 to form an airflow that is discharged into the pump pipe assembly 1. The positive pressure airflow helps to seal the contact position between the pump shaft 2 and the mounting seat 5, preventing the fluid transported inside the pump pipe assembly 1 from leaking to the outside of the pump pipe assembly 1 along the contact position between the pump shaft 2 and the mounting seat 5. At the same time, the positive pressure airflow can significantly shorten the arrangement length of the sealing packing 7.

[0041] Compared with the prior art, the adjusting plate 62 of the present invention is driven to move the transmission disc 64 and the central tube 65, which can drive the transmission screw tube 66 to rotate, thereby driving the adjusting rod 32 to move axially and adjust the angle of the blade 37. This changes the previous method of adjusting the blade 37 by hydraulic pressure, thus completely eliminating the impact of hydraulic oil leakage. In addition, when the transmission disc 64 rotates with the pump shaft 2, the air compressor 67 cooperates with the adjusting plate 62 to pump positive pressure gas into the air compressor ring 9 position, forming an airflow that is discharged to one end of the mounting base 5. The positive pressure airflow helps to seal the contact position between the pump shaft 2 and the mounting base 5, thereby significantly shortening the arrangement length of the sealing packing 7, reducing the frictional resistance of the sealing packing 7 on the pump shaft 2, and reducing energy consumption.

[0042] As a preferred embodiment, the impeller mechanism 3 is located at one end of the pump shaft 2 inside the pump pipe assembly 1, including an impeller seat 31, on which blades 37 are rotatably mounted; an adjusting rod 32, which passes through the middle of the impeller seat 31; and a transmission assembly, which is located inside the impeller seat 31. When the adjusting rod 32 is driven to move axially, the angle of the blades 37 is adjusted by transmission through the transmission assembly. Specifically, the impeller seat 31 is fixedly connected to the bottom end of the pump shaft 2, and blades 37 are rotatably mounted on the periphery of the impeller seat 31. A pivot 36 is used to rotatably mount the blade 37 onto the impeller seat 31. The transmission assembly includes a transmission frame 33, which is fixedly mounted on the bottom end of the adjusting rod 32. A crank arm 35 is fixedly fitted onto one end of the blade 37 near the center of the impeller seat 31. A connecting rod 34 is hinged at one end to the transmission frame 33 and at the other end to the crank arm 35. When the adjusting rod 32 moves axially, it drives the transmission frame 33 to move synchronously, and the transmission is carried out through the connecting rod 34 and the crank arm 35, thereby realizing the adjustment of the angle of the blade 37.

[0043] As a preferred embodiment, the mounting base 5 is filled with sealing packing 7 that mates with the pump shaft 2. An adjusting rod 32 passes through the middle of the pump shaft 2, and an exhaust groove 611 is provided on the adjusting rod 32. An exhaust inclined hole 612 is provided on the pump shaft 2. The exhaust groove 611 communicates with the compressed air annular seam 9 through the exhaust inclined hole 612. Specifically, the sealing packing 7 is filled in the upper part of the mounting base 5, and a pressure cap that presses against the sealing packing 7 is threaded to the top of the mounting base 5. The sealing packing 7, when compressed, can tightly adhere to the outer wall of the pump shaft 2 and the inner wall of the mounting base 5. The wall seals the contact point between the pump shaft 2 and the mounting base 5. A guide bearing 8 is fixedly installed at the bottom of the mounting base 5 to provide auxiliary support for the pump shaft 2. It should be noted that the guide bearing 8 has several cooling grooves, which will not obstruct the discharge of gas in the pressure ring gap 9. The air in the adjusting rod 32 can flow along the exhaust groove 611 and the exhaust inclined hole 612 into the pressure ring gap 9, and then be discharged along the end of the pressure ring gap 9 near the inside of the pump pipe assembly 1, so as to achieve the sealing of the contact point between the pump shaft 2 and the mounting base 5 by positive pressure airflow.

[0044] As a preferred technical solution of this embodiment, the adjusting mechanism 6 is located at one end of the pump shaft 2 outside the pump pipe assembly 1, and includes a connecting cage 63 for restricting the position of the transmission disc 64 so that the transmission disc 64 rotates with the pump shaft 2. The screw assembly is located in the middle of the connecting cage 63. Specifically, the connecting cage 63 includes a connecting rod 633 and a lower connecting plate 631 and an upper connecting plate 632 fixedly installed at both ends of the connecting rod 633. The lower connecting plate 631 and the upper connecting plate 632 are fixedly connected to the pump shaft 2 by screws. The transmission disc 64 is engaged with the connecting rod 633 so that the pump shaft 2 can drive the transmission disc 64 to rotate synchronously through the connecting cage 63. At the same time, the transmission disc 64 can move along the axial direction of the pump shaft 2 on the connecting rod 633.

[0045] As a preferred embodiment, the screw assembly includes a transmission screw tube 66 rotatably mounted on the connecting cage 63, a central tube 65 disposed in the middle of the transmission disc 64, and an external thread formed on the outside of the adjusting rod 32. The transmission screw tube 66 is threadedly connected to the adjusting rod 32, and the central tube 65 is helically connected to the transmission screw tube 66. Specifically, the bottom of the upper connecting plate 632 is provided with a bearing seat that mates with the transmission screw tube 66, and the outside of the transmission screw tube 66 is provided with a helical groove that mates with the central tube 65. The central tube 65 is connected to the transmission screw tube 66 through the helical groove. When the transmission disc 64 is driven to move the central tube 65 axially along the pump shaft 2, the central tube 65 is connected to the transmission screw tube 66 through the helical groove. The slot drive can drive the transmission solenoid 66 to rotate axially. The helix angle between the inner part of the transmission solenoid 66 and the outer part of the adjusting rod 32 is greater than the equivalent friction angle of the helical pair, giving the transmission solenoid 66 and the adjusting rod 32 a self-locking capability. The adjusting rod 32 is restricted by the connecting rod 34 and will not rotate axially. When the transmission solenoid 66 is driven to rotate by the central tube 65, it can drive the adjusting rod 32 to move axially, thereby adjusting the angle of the blade 37. Furthermore, due to the self-locking capability between the adjusting rod 32 and the transmission solenoid 66, the adjusting rod 32 can remain stable under the axial force applied by the blade 37 during operation, preventing the blade 37 from sagging.

[0046] As a preferred technical solution in this embodiment, air compression components 67 are provided at both the top and bottom of the transmission disk 64. When the transmission disk 64 drives the air compression components 67 to rotate towards the position of the adjusting plate 62, the air compression components 67 can be compressed by the adjusting plate 62 to compress air. Specifically, by providing air compression components 67 on both sides of the transmission disk 64, the air compression efficiency can be greatly improved, thereby increasing the airflow velocity inside the air compression ring 9 and improving the auxiliary sealing effect at the connection between the pump shaft 2 and the mounting base 5. When the pump shaft 2 rotates, it synchronously drives the transmission disk 64 to rotate. Several air compression components 67 on the transmission disk 64 are successively engaged in the adjusting plate 62. The air compression components 67 are compressed by the adjusting plate 62 to force air into the air compression ring 9. The pump shaft 2 drives the transmission disk 64 to rotate continuously, thereby realizing continuous air supply to the air compression ring 9, so that an airflow is formed inside the air compression ring 9 and discharged into the pump pipe assembly 1. The positive pressure airflow assists in sealing the contact position between the pump shaft 2 and the mounting base 5.

[0047] The air compressor assembly 67 includes an air compressor seat 671, which is threadedly connected to the transmission disc 64; an air compressor piston 672, which is movably fitted inside the air compressor seat 671; and a return spring 673, which is engaged inside the air compressor seat 671 and is used to push the air compressor piston 672 back to its original position after it disengages from the adjusting plate 62. A ball bearing is rotatably mounted on the end of the air compressor piston 672 away from the air compressor seat 671 to reduce the friction between the air compressor piston 672 and the adjusting plate 62 when the air compressor assembly 67 moves inside the adjusting plate 62. After the air compressor assembly 67 moves into the adjusting plate 62, the air compressor piston 672 is squeezed and retracts into the air compressor seat 671, which can force air into the air compressor ring slit 9.

[0048] As a preferred technical solution in this embodiment, the regulating plate 62 is arc-shaped, and both ends of the regulating plate 62 are provided with guide portions that cooperate with the air compressor 67. Specifically, when the air compressor 67 moves into the regulating plate 62, the height of the air compressor 67 is constant. The regulating plate 62 is driven to move the transmission disk 64 through the air compressor 67, thereby realizing the adjustment of the impeller mechanism 3. The guide portion at the end of the regulating plate 62 is in an outward expanding state. When the air compressor 67 moves into the regulating plate 62, the guide portion squeezes the air compressor 67, which can gradually squeeze the air compressor piston 672 in the air compressor 67 into place to complete the air compressor operation. The regulating mechanism 6 also includes an electric push rod 61, which is fixedly installed on the pump pipe assembly 1, and the output shaft of the electric push rod 61 is fixedly connected to the regulating plate 62. The electric push rod 61 is controlled by the control system to drive the regulating plate 62 to move and adjust the impeller mechanism 3.

[0049] As a preferred technical solution in this embodiment, the transmission disc 64 and the connecting cage 63 are provided with air passages that communicate with the air compressor 67 for supplying air to the adjusting rod 32. Specifically, the transmission disc 64 and the air passage on the upper connecting plate 632 are connected by a hose. The air passage on the transmission disc 64 is provided with miniature one-way air valves 68 located at the front end and rear end of the air inlet of the air compressor 67 for limiting the airflow direction, ensuring that the air compressor 67 can draw in outside air while preventing the air pressed into the air compressor ring slit 9 from flowing back.

[0050] As can be seen from the above embodiments, the air compressed by the air compressor 67 enters the transmission screw tube 66 through the upper connecting plate 632 and is discharged into the air compressor ring gap 9 through the adjusting rod 32. There is a probability that the air will leak to the outside along the threaded connection between the transmission screw tube 66 and the adjusting rod 32. Therefore, the following embodiments are proposed to solve the above problems.

[0051] In another embodiment of the present invention, a lower annular airbag 610 is glued to the bottom end of the transmission solenoid 66. An air-lift assembly 69 is provided inside the connecting cage 63. The air-lift assembly 69 is opened by airflow, which can inflate the lower annular airbag 610. Specifically, the lower annular airbag 610 is fitted outside the adjusting rod 32. When the lower annular airbag 610 is not inflated, its inner ring abuts against the adjusting rod 32. When the airflow pressed in by the air-compressing assembly 67 flows into the transmission solenoid 66 through the upper connecting plate 632, the airflow pushes the air-lift assembly 69 to open. When the air-lift assembly 69 is activated, it can inflate the lower annular airbag 610, causing the lower annular airbag 610 to inflate, thereby... The inner ring of the lower annular airbag 610 tightly wraps around the outside of the adjusting rod 32, sealing the contact point between the bottom end of the transmission solenoid 66 and the adjusting rod 32, preventing air entering the transmission solenoid 66 from leaking to the outside along the threaded connection between the transmission solenoid 66 and the adjusting rod 32. It should be noted that the lower annular airbag 610 is configured to be inflated. When adjusting the impeller mechanism 3, the pump shaft 2 generally stops rotating. At this time, the air compressor 67 stops compressing air, the air top assembly 69 resets, and the inflated state of the lower annular airbag 610 is released. When there is relative movement between the transmission solenoid 66 and the adjusting rod 32, friction between the adjusting rod 32 and the inside of the lower annular airbag 610 is avoided.

[0052] As a preferred embodiment, the air-cushion assembly 69 includes a fixedly connected ring seat 693 and an upper annular airbag 694. A transmission solenoid 66 and a communicating air passage are provided inside the ring seat 693. The upper annular airbag 694 communicates with the lower annular airbag 610 through the air passage. Specifically, the air-cushion assembly 69 also includes an air-cushion shell 691, which is fixedly installed at the bottom of the upper connecting plate 632 and communicates with the air passage on the upper connecting plate 632; and an elastic push rod 692, which is movably installed on the air-cushion shell 691. Air compressed by the air-compressing assembly 67 enters the air-cushion shell 691 along the air passage. Then, the elastic push rod 692 can be pushed down to open the bottom of the air top shell 691, thereby allowing air to be discharged into the transmission screw tube 66; the ring seat 693 is fixedly installed above the inside of the transmission screw tube 66. When the elastic push rod 692 is pushed down by the airflow, it can squeeze the upper annular air bag 694, thereby forcing the air inside the upper annular air bag 694 into the lower annular air bag 610, so that the lower annular air bag 610 expands and tightly wraps around the outside of the adjusting rod 32; the upper annular air bag 694 is a non-inflatable air bag, preferably made of TPU; the lower annular air bag 610 is an inflatable air bag, preferably made of silicone rubber.

[0053] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A diagonal axial flow pump with a mechanical blade angle adjusting mechanism, comprising a pump pipe assembly (1), wherein a mounting seat (5) is arranged on the pump pipe assembly (1), a pump shaft (2) is rotatably arranged in the mounting seat (5), and a impeller mechanism (3) is arranged at one end of the pump shaft (2), characterized in that, Further comprising an adjusting mechanism (6) arranged at the other end of the pump shaft (2) for adjusting the impeller mechanism (3); the contact position of the mounting seat (5) and the pump shaft (2) forms an air ring gap (9); The adjusting mechanism (6) comprises a screw rod group with self-locking function, which is in transmission connection with the impeller mechanism (3); a transmission disc (64) is sleeved on the outside of the screw rod group and can rotate with the pump shaft (2), and the transmission disc (64) is provided with an air compression assembly (67); an adjusting tile (62) is clamped on the outside of the transmission disc (64); When the adjusting tile (62) drives the transmission disc (64) to move, the screw rod group is driven to adjust the impeller mechanism (3) in a self-locking manner; when the transmission disc (64) rotates with the pump shaft (2), the air compression assembly (67) on the transmission disc (64) is clamped into the adjusting tile (62) one by one to compress air, and the airflow is compressed into the air ring gap (9); The impeller mechanism (3) is arranged at one end of the pump shaft (2) inside the pump pipe assembly (1), comprising an impeller seat (31), a blade (37) is rotatably installed on the periphery of the impeller seat (31); an adjusting rod (32) is arranged in the middle of the impeller seat (31); a transmission assembly is arranged in the inside of the impeller seat (31); when the adjusting rod (32) is driven to move axially, the angle of the blade (37) is adjusted through the transmission assembly; The mounting seat (5) is filled with sealing filler (7) matched with the pump shaft (2), the adjusting rod (32) is arranged in the middle of the pump shaft (2), the adjusting rod (32) is provided with an exhaust groove (611), the pump shaft (2) is provided with an exhaust inclined hole (612), and the exhaust groove (611) is communicated with the air ring gap (9) through the exhaust inclined hole (612); The adjusting mechanism (6) is arranged at one end of the pump shaft (2) outside the pump pipe assembly (1), comprising a connecting cage (63) for limiting the position of the transmission disc (64), so that the transmission disc (64) rotates with the pump shaft (2), and the screw rod group is arranged in the middle of the connecting cage (63); the screw rod group comprises a transmission screw pipe (66) rotatably installed on the connecting cage (63), a center pipe (65) arranged in the middle of the transmission disc (64), and an external thread arranged on the outside of the adjusting rod (32), the transmission screw pipe (66) is in threaded connection with the adjusting rod (32), and the center pipe (65) is in screw connection with the transmission screw pipe (66); the top and bottom of the transmission disc (64) are provided with air compression assemblies (67), when the transmission disc (64) drives the air compression assemblies (67) to rotate to the position of the adjusting tile (62), the air compression assemblies (67) are extruded by the adjusting tile (62) and can be contracted to compress air, the adjusting tile (62) is arc-shaped as a whole, and the two ends of the adjusting tile (62) are provided with guide portions matched with the air compression assemblies (67).

2. The inclined axial flow pump having a mechanical blade angle adjusting mechanism according to claim 1, characterized in that, The transmission disc (64) and the connecting cage (63) are provided with air channels communicated with the air compression assemblies (67) for supplying air to the adjusting rod (32).

3. The inclined axial flow pump having a mechanical blade angle adjusting mechanism according to claim 1, characterized in that, The bottom end of the transmission screw pipe (66) is glued with a lower annular air bag (610), the inside of the connecting cage (63) is provided with an air top assembly (69), the air top assembly (69) is opened by air flow and can inflate the lower annular air bag (610) to make it expand.

4. The mixed flow pump with a mechanical blade angle adjusting mechanism according to claim 3, wherein The air top assembly (69) includes a fixedly connected ring seat (693) and an upper annular air bag (694), the inside of the transmission screw pipe (66) and the ring seat (693) is provided with a communicated air channel, and the upper annular air bag (694) is communicated with the lower annular air bag (610) through the air channel.

Images