A vane mounting structure supporting angle adjustment

Abstract

The blade mounting structure provided by the application supports angle adjustment. When the pull rod is pushed and pulled, the bottom operation frame is displaced, the operation frame drives the articulated crank by the ear handle and the connecting rod, the other end of the crank is connected to the blade handle of the blade, the blade handle is rotated in the mounting hole of the outer seat body and the inner seat body, and the installation angle of the blade is adjusted. During the adjustment process, the blade and the blade mounting structure do not need to be disassembled, and the operation efficiency is effectively improved. In the application, the branches of the operation frame are connected to all the blades respectively, and the angles of all the blades can be adjusted at the same time through one operation of the pull rod, so that the operation efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of axial flow pump technology, specifically to a blade mounting structure that supports angle adjustment. Background Technology

[0002] Axial flow pumps are pumps that use the force generated by the blades of a rotating impeller to transport liquid along its axis. They come in several types, including vertical, horizontal, inclined, and through-flow. An axial flow pump impeller has 3 to 5 blades that rotate within a cylindrical pump casing. Axial flow pump blades are available in two structures: fixed and adjustable. Adjustable blade structures allow the pump to operate in a high-efficiency range under different conditions by adjusting the blade installation angle. There are many methods for adjusting the blade installation angle. For example, patent document CN207363941U discloses a blade installation structure for a semi-adjustable water pump currently in use by our company. This design involves inserting the blade shank into the blade mounting hole of the rotor body. The radial flange and positioning step 3 have mutually engaging outer and inner positioning holes. The two ends of the positioning pin are inserted into the outer and inner positioning holes. A threaded hole is coaxially arranged and interconnected at the front end of the positioning hole of the radial flange. The threaded hole is connected to a plug. Simply remove the plug to take out the positioning pin, and then rotate the blade to adjust the angle. The blade angle can be quickly adjusted without disassembling the entire water pump. However, in this structure, when the blade angle needs to be adjusted, each blade needs to be adjusted individually, resulting in low adjustment efficiency. Summary of the Invention

[0003] To address the problem of low blade adjustment efficiency in existing axial flow pumps, this invention provides a blade mounting structure that supports angle adjustment, enabling more efficient blade angle adjustment.

[0004] The structure of this utility model is as follows: a blade mounting structure that supports angle adjustment, comprising: a blade structure and an impeller seat, wherein the blade structure comprises: a blade, a blade root and a petiole; characterized in that it further comprises: an angle adjustment structure; The impeller seat includes an outer seat body and an inner seat body. The outer seat body has a drum-shaped hollow structure, and the inner seat body is located in the inner cavity of the outer seat body below the top drum surface. An external mounting hole for mounting the blade stalk is formed on the cylindrical side wall of the outer seat, and an internal mounting hole is formed on the side wall of the inner seat. The external mounting hole and the internal mounting hole correspond one-to-one and are coaxially arranged. An axial tie rod mounting cavity is formed along the axis of the outer seat, and the tie rod mounting cavity penetrates the inner seat. The angle adjustment structure includes: a pull rod, an operating frame, an inner bearing, an outer bearing, a connecting rod, a crank arm mounting ring, and a crank arm. The inner bearing is installed in the inner mounting hole, and the outer bearing is installed in the outer mounting hole. The blade shank in the blade structure is rotatably mounted on the impeller seat through the inner bearing and the outer bearing. The pull rod passes through the pull rod mounting cavity from top to bottom and is installed at the axial position of the impeller seat, with the operating frame at the bottom end; the operating frame has a star-shaped structure, with an ear handle rotatably mounted on each branch based on the ear handle shaft, and the ear handle shaft is parallel to the pull rod; The crank arm mounting ring is fitted onto the blade shank at the position between the inner and outer bearings; one end of the crank arm is connected to the crank arm mounting ring, and the other end is hinged to one end of the connecting rod via a first pin, and the other end of the connecting rod is hinged to the lug via a second pin; the first pin and the second pin are parallel to each other and perpendicular to the pull rod shown.

[0005] Its further features are: It also includes a limiting structure, which includes a limiting groove and a slider. The limiting groove is formed on the branch of the operating frame and is parallel to the pull rod. The slider is installed on the inner wall of the outer seat and is slidably installed in the limiting groove. It also includes: a limiting nut, which is installed with the blade holder based on thread engagement; The blade holder includes: an outer bearing mounting part, a crank arm mounting part, a threaded part, and an inner bearing mounting part, wherein the threaded part is provided with an external thread that mates with the limiting nut; It also includes: a limiting ring, wherein the limiting ring is two semi-circular ring structures; The blade holder includes: an outer bearing mounting part, a crank arm mounting part, a retaining ring mounting groove, and an inner bearing mounting part; The inner diameter of the limiting retaining ring is adapted to the diameter of the retaining ring mounting groove, and the thickness of the limiting retaining ring is greater than the groove depth of the retaining ring mounting groove. The curvature of the side wall of the outer seat body is adapted to the curvature of the blade; An installation gap δ1 is provided between the outer bearing and the blade structure, and an installation gap δ2 is provided between the crank arm mounting ring and the blade structure; The installation gaps δ1 and δ2 are both 2 mm. The inner cavity of the external mounting hole is provided with a stepped surface, and from the outside to the inside are provided a pressure ring mounting surface and a blade root mounting surface, and a sealing structure mounting groove is provided between the pressure ring mounting surface and the blade root mounting surface; It also includes a sealing assembly, which is installed in the mounting groove of the sealing structure and is fitted around the outer circumference of the blade root.

[0006] This application provides a blade mounting structure that supports angle adjustment. When the pull rod is pushed or pulled, it causes the operating frame at the bottom to shift. The operating frame drives a hinged crank arm via a lug and a connecting rod. The other end of the crank arm is connected to the blade stalk, causing the blade stalk to rotate in the mounting holes of the outer and inner seats, thereby adjusting the blade's mounting angle. No disassembly of the blade or its mounting structure is required during adjustment, effectively improving operational efficiency. Furthermore, in this application, all blades are connected via branches of the operating frame, allowing for simultaneous adjustment of all blade angles with a single operation of the pull rod, significantly enhancing operational efficiency. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the overall structure of the blade mounting structure that supports angle adjustment in this application. Figure 2 A schematic diagram of the angle adjustment structure; Figure 3 This is a schematic diagram of the impeller housing structure; Figure 4 This is a schematic diagram of the external mounting hole structure; Figure 5 Example 1 of blade structure; Figure 6 Example of a mounting structure for a limit nut; Figure 7 Example 2 shows a blade structure.

[0008] In the diagram, 01 is the pull rod, 02 is the operating frame, 021 is the limiting groove, 03 is the lug, 031 is the lug shaft, 04 is the connecting rod, 051 is the first pin, 05 is the second pin, 06 is the inner bearing, 07 is the crank arm mounting ring, 08 is the crank arm, 081 is the keyway, 09 is the outer bearing, 10 is the blade structure, 101 is the blade, 102 is the blade handle, 103 is the blade root, 104 is the outer bearing mounting part, 105 is the crank arm mounting part, 106 is the retaining ring mounting groove, 107 is the inner bearing mounting part, 108 is the threaded part, 11 is the impeller seat, 111 is the outer seat body, 112 is the inner seat body, 113 is the outer mounting hole, 1131 is the pressure ring mounting surface, 1132 is the blade root mounting surface, 1133 is the sealing structure mounting groove, 114 is the inner mounting hole, 115 is the pressure ring, 116 is the sealing assembly, 117 is the slider, 118 is the pull rod mounting cavity, 12 is the limiting retaining ring, and 13 is the limiting nut. Detailed Implementation

[0009] like Figures 1-4 As shown, this application includes a blade mounting structure that supports angle adjustment, comprising: a blade structure 10, an angle adjustment structure, and an impeller seat 11. The blade structure 10 is mounted on the impeller seat 11 via the angle adjustment structure. The blade structure 10 in this application includes: a blade 101, a petiole 102, and a blade root 103.

[0010] like Figure 3 As shown, the impeller seat 11 includes an outer seat body 111 and an inner seat body 112. The outer seat body 111 is a drum-shaped hollow structure, and the inner seat body 112 is a hollow spherical shell structure. The inner seat body 112 is located in the inner cavity of the outer seat body 111, below the top drum surface.

[0011] An external mounting hole 113 for mounting the blade stalk 102 is formed on the cylindrical side wall of the outer base 111, and an internal mounting hole 114 is formed on the side wall of the inner base 112. The external mounting holes 113 and the internal mounting holes 114 correspond one-to-one and are coaxially arranged. An axial tie rod mounting cavity 118 is formed along the axis of the outer base 111, and the tie rod mounting cavity 118 penetrates the inner base 112. The number of external mounting holes 113 and internal mounting holes 114 are the same as the number of blade structures 10. In this embodiment, there are 3 blade structures 10, so 3 external mounting holes 113 and 3 internal mounting holes 114 are formed to realize the installation of 3 blade structures 10.

[0012] The curvature of the side wall of the outer seat 111 is adapted to the curvature of the blade 101 to ensure that the blade 101 can rotate smoothly. Figure 1 , Figure 3 and Figure 4 As shown, the inner cavity of the outer mounting hole 113 is provided with a stepped surface, specifically including: a pressure ring mounting surface 1131 and a blade root mounting surface 1132. A sealing structure mounting groove 1133 is also provided between the pressure ring mounting surface 1131 and the blade root mounting surface 1132. The pressure ring 115 is bolted to the pressure ring mounting surface 1131. When the blade shank 102 is inserted into the inner cavity of the outer mounting hole 113, the blade root 103 is mounted on the blade root mounting surface 1132, and the sealing assembly 116 is mounted in the sealing structure mounting groove 1133. At the same time, the sealing assembly 116 is fitted around the outer circumference of the blade root 103; the top of the sealing assembly 116 is pressed by the pressure ring 115. The specific sealing assembly 116 is implemented based on existing technology.

[0013] The angle adjustment structure includes: a pull rod 01, an operating frame 02, a connecting rod 04, an inner bearing 06, a crank arm mounting ring 07, a crank arm 08, and an outer bearing 09. The inner bearing 06 is installed in the inner mounting hole 114, and the outer bearing 09 is installed in the outer mounting hole 113. The blade shank 102 of the blade 101 is rotatably mounted on the impeller seat 11 via the inner bearing 06 and the outer bearing 09. The outer bearing 09 is fitted onto the outer bearing mounting part 104 on the blade shank 102, and the inner bearing 06 is fitted onto the inner bearing mounting part 107. In specific implementation, the outer bearing 09 and the inner bearing 06 are based on the sliding bearing module in the prior art.

[0014] The tie rod mounting cavity 118 is located at the axial center of the impeller seat 11. The tie rod 01 extends from top to bottom through the tie rod mounting cavity 118, and an operating frame 02 is mounted at the bottom of the tie rod 01. The operating frame 02 has a star-shaped structure with the number of branches matching the number of blade structures. Each branch has a lug 03 rotatably mounted on a lug shaft 031, which is parallel to the tie rod 01, ensuring that the lug 03 can follow the angle adjustment process. The top of the tie rod 01 is connected to the output end of a linear drive device (not marked in the figure). The linear drive device drives the tie rod 01 to achieve linear movement along the tie rod mounting cavity 118. In this embodiment, the linear drive device is based on a hydraulic cylinder. When the tie rod 01 does not need to move, the position of the tie rod 01 is locked by the hydraulic cylinder.

[0015] The crank arm mounting ring 07 is fitted onto the crank arm mounting part 105 located between the inner and outer bearings on the blade shank 102; one end of the crank arm 08 is connected to the crank arm mounting ring 07, and the other end of the crank arm 08 is hinged to one end of the connecting rod 04 through the first pin 051, and the other end of the connecting rod 04 is hinged to the lug 03 through the second pin 05; the first pin 051 and the second pin 05 are parallel to each other and perpendicular to the pull rod 01.

[0016] The crank arm mounting ring 07 is fitted onto the crank arm mounting part 105 of the blade holder 102. It is installed with the blade holder 102 based on the cooperation of the keyway 081 and the key, ensuring that when the crank arm mounting ring 07 rotates, it can drive the blade holder 102 to rotate synchronously.

[0017] After using the technical solution of this utility model, the top end of the pull rod 01 is driven by a linear drive device, based on Figure 2 As shown, assuming the pull rod 01 achieves upward or downward linear movement, the pull rod 01 drives the operating frame 02 and the lug 03 to move upward or downward. The lug 03 drives the bottom end of the connecting rod 04 to move vertically. The blade shank 102 is rotatably mounted on the impeller seat 11 through the inner bearing 06 and the outer bearing 09. The crank arm mounting ring 07 is fitted onto the blade shank 102, so the position of the crank arm mounting ring 07 in the vertical direction will not change. When the end of the connecting rod 05 connected to the lug 03 moves vertically, one end of the crank arm 08 is fixedly connected to the crank arm mounting ring 07, and the other end rotates around the first pin 051. The two ends of the connecting rod 04 rotate around the first pin 051 and the second pin 05, respectively. Then the angle between the crank arm 08 and the connecting rod 04 changes. The crank arm 08 drives the crank arm mounting ring 07 and the blade shank 102 to rotate, thereby adjusting the installation angle of the blade 101. When the angle of blade 101 is adjusted to the required angle, the linear drive device can be stopped. In this application, the installation angle of multiple blades can be adjusted simultaneously by means of connecting rod 01 and star-shaped operating frame 02, which is not only efficient, but also ensures that the adjustment angle of multiple blades is the same.

[0018] The crank arm mounting ring 07 is mounted on the blade holder 102 via a keyway 081 and a key, ensuring synchronous rotation of both. This application also includes an axial limiting structure for the crank arm, comprising two types: a limiting retaining ring 12 or a limiting nut 13. One type can be selected for use depending on the application scenario.

[0019] Figure 2 In the embodiment, a limiting ring 12 is used, which is two semi-circular ring structures.

[0020] like Figure 5 As shown, the blade shank 102, adapted to the limiting retaining ring 12, is structured as follows: an outer bearing mounting part 104, a crank arm mounting part 105, a retaining ring mounting groove 106, and an inner bearing mounting part 107; the inner diameter of the limiting retaining ring 12 is adapted to the diameter of the retaining ring mounting groove 106, and the thickness of the limiting retaining ring 12 is greater than the groove depth of the retaining ring mounting groove 106, ensuring that the protruding part of the limiting retaining ring 12 can limit the crank arm after being inserted into the retaining ring mounting groove 106; a limiting boss 1061 is provided between the retaining ring mounting groove 106 and the inner bearing mounting part 107. Figure 2 As shown, after the crank arm mounting ring 07 is installed, two semi-annular limiting retaining rings 12 are installed into the retaining ring mounting groove 106 of the blade shank 102 to limit the axial position of the crank arm mounting ring 07.

[0021] Figure 6 In the embodiment, a limiting nut 13 is used, which is installed with the blade shank 102 based on thread engagement.

[0022] Specifically, such as Figure 7 As shown, the blade holder 102 includes the following components with progressively smaller diameters: an outer bearing mounting part 104, a crank arm mounting part 105, a threaded part 108, and an inner bearing mounting part 107. The threaded part 108 is provided with an external thread that mates with the limiting nut 13. After the crank arm mounting ring 07 is installed, the limiting nut 13 is mounted on the threaded part 106 of the blade holder 102 based on the threaded engagement, thereby limiting the axial position of the crank arm mounting ring 07.

[0023] Depending on performance, axial flow pumps typically have 3 to 5 blades per unit. For vertical pumps, the blade weight is basically the same. When the pump is running, the blades are under the same centrifugal force, and the positions of the parts between the tie rod and the blades are consistent with their positions during assembly, so no additional frictional resistance is caused. Therefore, both the limit ring 12 and the limit nut 13, which are types of crank arm limiting structures, can be used in vertical pumps.

[0024] When the limiting ring 12 is used as the crank arm limiting structure, an installation gap δ1 is provided between the outer bearing 09 and the blade root 103, an installation gap δ2 is provided between the end face of the crank arm mounting ring 07 and the outer bearing mounting part 104, and an installation gap δ3 is provided between the inner bearing 06 and the limiting boss 1061. This application reduces the contact area between the moving and stationary parts when adjusting the blade angle by setting the installation gaps, thereby reducing frictional torque and compensating for manufacturing errors. In this embodiment, δ1=δ2=δ3=2mm.

[0025] Because there is no installation gap between the crank arm mounting ring 07 and the outer bearing 09, the crank arm mounting ring 07 cannot be displaced outwards. However, when using the limiting ring 12 for limiting, due to machining accuracy limitations, the crank arm mounting ring 07 cannot be completely limited on the inner side by the limiting ring 12. When the blade is at certain angles, the distance between the crank arm mounting ring 07 and the inner bearing 06 will change. That is, for inclined and horizontal pumps, the blades rotated above and below the pump shaft will have different positions relative to the impeller seat 11 due to gravity, resulting in a small-angle twist in the parts between the tie rod and the blade. When adjusting the blade angle, the degree of twist will increase under the force of adjusting the blade, thus increasing additional resistance. In this application, the axial position of the crank arm mounting ring 07 is limited by the limiting nut 13 based on the threaded portion 106 of the blade holder 102. Regardless of the blade's rotation position, the position of the crank arm mounting ring 07 will not change, and adjusting the blade angle via the tie rod will not add additional resistance. The crank arm limiting structure in the form of the limit nut 13 is suitable for various types of axial flow pumps.

[0026] When the limiting nut 13 is used as the crank arm limiting structure, the outer bearing 09 and the blade root 103 are provided with an installation gap δ1, and the crank arm mounting ring 07 and the end face of the outer bearing mounting part 104 are provided with δ2. In this embodiment, the values ​​of the two installation gaps δ1 and δ2 are 2mm. At the same time, the limiting nut 13 limits the crank arm mounting ring 07 based on the thread engagement. During assembly, the limiting nut 13 is tightened. That is, during the blade's operation, due to the limiting effect of the limiting nut 13, the distance between the crank arm mounting ring 07 and the blade and the inner bearing 06 mounted on the inner seat 112 will not change, the gap between the inner bearing 06 and the threaded part 108 will not change, and no friction will occur. Therefore, when using the limiting nut 13, the gap δ3 between the inner bearing 06 and the threaded part 108 is 0mm.

[0027] To ensure that the angle adjustment structure does not rotate around the pull rod 01 during use, a limiting structure is also provided in this application. The limiting structure includes a limiting groove 021 and a slider 117. The limiting groove 021 is formed on a branch of the operating frame 02 and is parallel to the pull rod 01. The slider 117 is installed on the inner wall of the outer seat 111 and is slidably installed in the limiting groove 021. When the operating frame 02 is pulled by the pull rod 01, based on the limiting effect of the slider 117 and the limiting groove 021, the operating frame 02 only slides along the direction of the limiting groove 021 and does not rotate.

[0028] The blade mounting structure in this application is applicable to various types of axial flow pumps. When used in a vertical pump, the axis of the tie rod 01 is installed perpendicular to the horizontal plane (90°); when used in a horizontal pump, the axis of the tie rod is installed parallel to the horizontal plane (0°); when used in an inclined pump, the axis of the tie rod is installed at an acute angle (generally 15°, 30°, or 45°) to the horizontal plane.

Claims

1. A blade mounting structure supporting angle adjustment, comprising: A blade structure and an impeller seat, wherein the blade structure includes: a blade, a blade root, and a petiole; characterized in that it further includes: an angle adjustment structure; The impeller seat includes an outer seat body and an inner seat body. The outer seat body has a drum-shaped hollow structure, and the inner seat body is located in the inner cavity of the outer seat body below the top drum surface. An external mounting hole for mounting the blade stalk is formed on the cylindrical side wall of the outer seat, and an internal mounting hole is formed on the side wall of the inner seat. The external mounting hole and the internal mounting hole correspond one-to-one and are coaxially arranged. An axial tie rod mounting cavity is formed along the axis of the outer seat, and the tie rod mounting cavity penetrates the inner seat. The angle adjustment structure includes: a pull rod, an operating frame, an inner bearing, an outer bearing, a connecting rod, a crank arm mounting ring, and a crank arm. The inner bearing is installed in the inner mounting hole, and the outer bearing is installed in the outer mounting hole. The blade shank in the blade structure is rotatably mounted on the impeller seat through the inner bearing and the outer bearing. The pull rod passes through the pull rod mounting cavity from top to bottom and is installed at the axial position of the impeller seat, with the operating frame at the bottom end; the operating frame has a star-shaped structure, with an ear handle rotatably mounted on each branch based on the ear handle shaft, and the ear handle shaft is parallel to the pull rod; The crank arm mounting ring is fitted onto the blade shank at the position between the inner and outer bearings; one end of the crank arm is connected to the crank arm mounting ring, and the other end is hinged to one end of the connecting rod via a first pin, and the other end of the connecting rod is hinged to the lug via a second pin; the first pin and the second pin are parallel to each other and perpendicular to the pull rod shown.

2. The blade mounting structure supporting angle adjustment according to claim 1, characterized in that: It also includes a limiting structure, which includes a limiting groove and a slider. The limiting groove is formed on the branch of the operating frame and is parallel to the pull rod. The slider is installed on the inner wall of the outer seat and is slidably installed in the limiting groove.

3. The blade mounting structure supporting angle adjustment according to claim 1, characterized in that: It also includes: a limiting nut, which is installed with the blade holder based on thread engagement; The blade holder includes an outer bearing mounting part, a crank arm mounting part, a threaded part, and an inner bearing mounting part, wherein the threaded part is provided with an external thread that mates with the limiting nut.

4. The blade mounting structure supporting angle adjustment according to claim 1, characterized in that: It also includes: a limiting ring, wherein the limiting ring is two semi-circular ring structures; The blade holder includes: an outer bearing mounting part, a crank arm mounting part, a retaining ring mounting groove, and an inner bearing mounting part; The inner diameter of the limiting retaining ring is adapted to the diameter of the retaining ring mounting groove, and the thickness of the limiting retaining ring is greater than the groove depth of the retaining ring mounting groove.

5. The blade mounting structure supporting angle adjustment according to claim 1, characterized in that: The curvature of the side wall of the outer seat is adapted to the curvature of the blade.

6. The blade mounting structure supporting angle adjustment according to claim 3, characterized in that: An installation gap δ1 is provided between the outer bearing and the blade structure, and an installation gap δ2 is provided between the crank arm mounting ring and the blade structure.

7. The blade mounting structure supporting angle adjustment according to claim 6, characterized in that: The installation gaps δ1 and δ2 are both 2 mm.

8. The blade mounting structure supporting angle adjustment according to claim 1, characterized in that: The inner cavity of the external mounting hole is provided with a stepped surface, and from the outside to the inside are provided a pressure ring mounting surface and a blade root mounting surface, and a sealing structure mounting groove is provided between the pressure ring mounting surface and the blade root mounting surface.

9. The blade mounting structure supporting angle adjustment according to claim 8, characterized in that: It also includes a sealing assembly, which is installed in the mounting groove of the sealing structure and is fitted around the outer circumference of the blade root.

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