An adjustable buffer-slip axial flow pump impeller

Abstract

The present invention provides an adjustable, slip-buffered axial-flow pump impeller, comprising a hub, a rotating shaft, and axial-flow pump blades. The rotating shaft is used to drive the hub to rotate, and the hub comprises a sliding hub and an impeller hub. The impeller hub is in transmission engagement with the rotating shaft, and the axial-flow pump blades are mounted on the outer side of the sliding hub. A plurality of balls are mounted between the inner ring of the sliding hub and the outer ring of the impeller hub for transmitting torque and for causing the axial-flow pump blades to slip circumferentially between the sliding hub and the impeller hub under external force. A buffer reset device is provided between the sliding hub and the impeller hub for buffering the resulting circumferential slip and resetting the sliding hub. The present invention improves the survival rate of aquatic organisms after passing through an axial-flow pump station, preventing extensive damage and death to the organisms.

Description

Technical Field

[0001] The present invention relates to the field of fluid machinery, and in particular to an axial flow pump impeller with adjustable buffering and sliding. Background Art

[0002] A pump is a machine that transports or pressurizes fluids. It transfers mechanical energy from a prime mover or other external energy to the liquid, increasing the liquid's energy. Pumps are primarily used to transport liquids such as water, oil, acid and alkali solutions, emulsions, suspensoids, and liquid metals. They can also transport liquid-gas mixtures and liquids containing suspended solids. Pumps are categorized by specific speed into centrifugal, mixed-flow, axial-flow, and tubular pumps, with axial-flow pumps offering higher flow rates. Large-scale water diversion projects typically have high-quality water sources and a healthy ecological environment, resulting in a higher abundance of aquatic life.

[0003] However, traditional barriers cannot completely block aquatic organisms, causing some to passively enter the axial flow pumps within the pumping station with the liquid flow, causing some damage or even death after passing through the impellers and guide vanes. This impacts the biodiversity of the reservoir area, making the recovery of some endangered species difficult. Furthermore, the death of aquatic organisms affects water quality. Therefore, it is necessary to improve the eco-friendliness of axial flow pumping stations and reduce the rate of damage to aquatic organisms caused by over-pumping.

[0004] The patented technology with publication number CN102400947A proposes a forward-swept blade inlet edge. However, in order to prevent entanglement of debris, the patent sets the blade to be thin at the rim and thick at the hub. This makes the circumferential speed at the rim greater and the cutting force on the fish greater, thereby increasing the fish mortality rate. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides an axial flow pump impeller with adjustable buffering and sliding, which improves the survival rate of aquatic organisms after passing through the axial flow pump station and avoids large-scale damage and death of the organisms.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] An adjustable axial flow pump impeller with buffered slip comprises a hub, a rotating shaft and axial flow pump blades, the rotating shaft is used to drive the hub to rotate, the hub comprises a sliding hub and an impeller hub, the impeller hub is in transmission cooperation with the rotating shaft, and the axial flow pump blades are installed on the outer side of the sliding hub; a plurality of balls are installed between the inner ring of the sliding hub and the outer ring of the impeller hub for transmitting torque and for causing the sliding hub and the impeller hub to produce circumferential slippage between the axial flow pump blades under the action of external force; a buffer reset device is provided between the sliding hub and the impeller hub for buffering the generated circumferential slippage and resetting the sliding hub.

[0008] Furthermore, a plurality of paired arc grooves are provided between the inner ring of the sliding hub and the outer ring of the impeller hub, and the paired arc grooves constitute ball mounting grooves in which a plurality of balls are placed.

[0009] Furthermore, the inclination angle of the ball mounting groove is 45 to 90 degrees; the inclination direction of the arc groove is consistent with the opposite direction of the impeller rotation, and the sliding hub is caused to move in the spiral axial direction under the action of external force.

[0010] Furthermore, the inner ring of the sliding hub is provided with a plurality of arc-shaped through grooves, and the outer ring of the impeller hub is provided with an arc-shaped groove with closed ends. The arc-shaped through grooves and the arc-shaped grooves with closed ends constitute ball mounting grooves, and the arc-shaped grooves with closed ends are used to constrain the movement of the balls in the grooves.

[0011] Furthermore, a positioning sealing ring is installed at one end of the impeller hub, a cavity is provided at one end of the sliding hub, one end of the buffer reset device is connected to the cavity wall of the sliding hub, and the other end of the buffer reset device is connected to the positioning sealing ring; under the action of external force, the sliding hub moves axially in a spiral direction, so that the buffer reset device stores energy, and when the external force decreases, the energy is released through the buffer reset device, so that the sliding hub moves in a reverse spiral direction.

[0012] Furthermore, a guide cap is installed at one end of the rotating shaft, and the fixed rotation direction of the guide cap is opposite to the rotation direction of the axial flow pump impeller; one end of the guide cap is provided with a high step and a low step in sequence according to the radial height, and the low step is used for axial positioning of the other end of the impeller hub; the high step supports the sliding hub.

[0013] Furthermore, the depth H of the high step is greater than the maximum compression of the buffer reset device, which can block the gap caused by the movement of the sliding hub, improve flow stability and reduce losses.

[0014] The beneficial effects of the present invention are:

[0015] 1. The adjustable buffered slip axial flow pump impeller described in the present invention comprises a hub comprising a sliding hub and an impeller hub, the impeller hub is in transmission cooperation with the rotating shaft, and axial flow pump blades are installed on the outer side of the sliding hub; a plurality of balls are installed between the inner ring of the sliding hub and the outer ring of the impeller hub, and the balls support and transmit torque. When the blades hit aquatic organisms, the reaction force of the organisms on the blades is transmitted to the balls, causing circumferential slip between the sliding hub and the impeller hub; and the buffering reset device can buffer the generated circumferential slip, reduce the rotation speed of the blades in a short time, thereby buffering the impact force between the blades and the organisms and reducing damage to the organisms.

[0016] 2. The adjustable buffered sliding axial flow pump impeller described in the present invention has an inclination angle of 45 to 90 degrees, and the inclination direction of the arc groove is consistent with the opposite direction of impeller rotation. The reaction force of the organism on the blade causes the sliding hub to move axially in the spiral direction.

[0017] 3. The adjustable buffered sliding axial flow pump impeller described in the present invention has a high step whose depth H is greater than the maximum compression of the buffer reset device, which can block the gap caused by the movement of the sliding hub, improve flow stability and reduce losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a half-section view of the adjustable buffer-slip axial flow pump impeller of the present invention.

[0020] Figure 2 This is a radial cross-sectional view of the axial flow pump impeller with adjustable buffering slip according to the present invention.

[0021] Figure 3 This is a partial enlarged view of the guide cap of the axial flow pump impeller with adjustable buffering and sliding according to the present invention.

[0022] Figure 4 This is an axially expanded view of the sliding hub of the present invention.

[0023] Figure 5 This is an axially expanded view of the impeller hub of the present invention.

[0024] In the picture:

[0025] 1- guide cap; 2- ball bearing; 3- sliding hub; 4- axial flow pump blade; 5- impeller hub; 7- buffer spring; 8- positioning sealing ring; 9- key; 10- rotating shaft; 11- high step; 12- low step. DETAILED DESCRIPTION

[0026] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "axial", "radial", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] like Figure 1 and Figure 2 As shown, the adjustable buffered slip axial flow pump impeller of the present invention includes a hub, a rotating shaft 10 and an axial flow pump blade 4, the hub includes a sliding hub 3 and an impeller hub 5, the impeller hub 5 and the rotating shaft 10 are matched with each other through a guide key, and the rotating shaft 10 is used to drive the impeller hub 5 to rotate; the axial flow pump blade 4 is installed on the outside of the sliding hub 3; a plurality of balls 2 are installed between the inner ring of the sliding hub 3 and the outer ring of the impeller hub 5, and the plurality of balls 2 placed in the ball mounting groove can realize the transmission torque, and the balls 2 can rotate freely in the ball mounting groove. When the axial flow pump blade 4 is subjected to the action of external force, the sliding hub 3 and the impeller hub 5 generate circumferential slip; a buffer reset device is provided between the sliding hub 3 and the impeller hub 5, which is used to buffer the generated circumferential slip and reset the sliding hub 3. In the axial flow pump impeller with adjustable buffering slip described in the present invention, when the axial flow pump blade 4 hits an aquatic organism, the reaction force of the organism on the axial flow pump blade 4 is transmitted to the ball 2, causing the sliding hub 3 and the impeller hub 5 to produce circumferential slip; and the buffering reset device can buffer the generated circumferential slip, reduce the blade rotation speed in a short time, thereby buffering the impact force between the blade and the organism, and reducing biological damage.

[0030] Several paired arcuate grooves are provided between the inner ring of the sliding hub 3 and the outer ring of the impeller hub 5. These paired arcuate grooves form ball mounting slots, within which several balls 2 are placed. The inner ring of the sliding hub 3 is provided with several arcuate through-grooves, while the outer ring of the impeller hub 5 is provided with arcuate grooves with closed ends to facilitate the installation of balls 2. These arcuate through-grooves and the closed arcuate grooves form the ball mounting slots, which are used to constrain the movement of balls 2 within the slots.

[0031] In order to make the sliding hub 3 move in the spiral axial direction, the inclination angle of the ball mounting groove is 45 to 90 degrees. The inclination direction of the arc groove is consistent with the opposite direction of the impeller rotation. In this way, the reaction force of the organisms on the blades causes the sliding hub to move in the spiral axial direction, which can protect underwater organisms. The inclination angle of the arc groove here is generally considered to be the spiral angle, which can be the angle between the arc groove and the side of the circumference after the arc groove is axially expanded, such as Figure 4 and Figure 5 As shown, the tilt angle in the figure is α.

[0032] like Figure 4 and Figure 5 In the embodiment shown, there are two symmetrical ball mounting grooves between the inner ring of the sliding hub 3 and the outer ring of the impeller hub 5, and the inclination angle of the ball mounting grooves is set to 90°, 75°, 60° or 45°. Figure 4 and Figure 5 The diagram shows ball mounting grooves at 90°, 75°, 60°, and 45° angles. This does not mean that the sliding hub 3 has ball mounting grooves with all four angles. Generally, there will only be a ball mounting groove with one angle. Balls will fill the ball mounting grooves at one angle, and the larger the angle, the greater the circumferential displacement and the more pronounced the cushioning effect. A 90-degree ball mounting groove will not have any cushioning effect. By simultaneously replacing the sliding hub 3 and impeller hub 5 with different mounting groove angles to accommodate different underwater organisms, the cushioning effect of the axial flow pump impeller can be adjusted.

[0033] In the embodiment, the buffer reset device is a buffer spring 7, a positioning sealing ring 8 is installed at one end of the impeller hub 5, a cavity is provided at one end of the sliding hub 3, one end of the buffer spring 7 is connected to the cavity wall of the sliding hub 3, and the other end of the buffer spring 7 is connected to the positioning sealing ring 8; under the action of external force, the sliding hub 3 is spirally moved axially, so that the buffer spring 7 stores energy, which can generate resistance to slow down the speed of the axial movement of the sliding hub 3; when the external force decreases, the energy is released through the buffer reset device, so that the sliding hub 3 is spirally moved in the opposite direction.

[0034] like Figure 4As shown, a guide cap 1 is mounted on one end of the rotating shaft 10. The direction of rotation of the guide cap 1 is opposite to that of the axial flow pump impeller. A high step 11 and a low step 12 are arranged at one end of the guide cap 1, arranged in sequence according to radial height. The low step 12 is used to axially locate the other end of the impeller hub 5. The high step 11 supports the sliding hub 3. The depth H of the high step 11 is greater than the maximum compression of the buffer reset device, which can block the gap caused by the movement of the sliding hub, improve flow stability, and reduce losses.

[0035] The present invention adopts a variety of friendly designs for the axial flow pump impeller, which reduces the relative speed when the axial flow pump blades collide with aquatic organisms, reduces the scratch damage to the organism's skin, and improves biological safety.

[0036] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0037] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An adjustable buffer slip axial flow pump impeller, comprising a hub, a rotating shaft (10) and axial flow pump blades (4), wherein the rotating shaft (10) is used to drive the hub to rotate, and is characterized in that: The hub comprises a sliding hub (3) and an impeller hub (5), the impeller hub (5) being in transmission cooperation with the rotating shaft (10), and an axial flow pump blade (4) being installed on the outer side of the sliding hub (3); a plurality of balls (2) being installed between the inner ring of the sliding hub (3) and the outer ring of the impeller hub (5) for transmitting torque and for causing the axial flow pump blade (4) to generate circumferential sliding between the sliding hub (3) and the impeller hub (5) under the action of an external force; a buffer reset device is provided between the sliding hub (3) and the impeller hub (5) for buffering the generated circumferential sliding and resetting the sliding hub (3); A plurality of paired arc grooves are provided between the inner ring of the sliding hub (3) and the outer ring of the impeller hub (5), and the paired arc grooves constitute ball mounting grooves, in which a plurality of balls (2) are placed; the inclination direction of the ball mounting grooves is consistent with the opposite direction of the impeller rotation, and the sliding hub (3) is caused to move in a spiral axial direction under the action of an external force; A guide cap (1) is installed at one end of the rotating shaft (10), and a high step (11) and a low step (12) are sequentially provided at one end of the guide cap (1) according to radial height, wherein the low step (12) is used for axial positioning of the other end of the impeller hub (5); the high step (11) supports the sliding hub (3); and the depth H of the high step (11) is greater than the maximum compression amount of the buffer reset device.

2. The adjustable buffer slip axial flow pump impeller according to claim 1, characterized in that: The inclination angle of the ball mounting groove is 45-90°.

3. The adjustable buffer slip axial flow pump impeller according to claim 1, characterized in that: The inner ring of the sliding hub (3) is provided with a plurality of arc-shaped through grooves, and the outer ring of the impeller hub (5) is provided with arc-shaped grooves with closed ends. The arc-shaped through grooves and the arc-shaped grooves with closed ends constitute ball mounting grooves, and the arc-shaped grooves with closed ends are used to constrain the movement of the balls (2) in the groove.

4. The adjustable buffer slip axial flow pump impeller according to claim 1, characterized in that: A positioning sealing ring (8) is installed at one end of the impeller hub (5), a cavity is provided at one end of the sliding hub (3), one end of the buffer reset device is connected to the cavity wall of the sliding hub (3), and the other end of the buffer reset device is connected to the positioning sealing ring (8); under the action of an external force, the sliding hub (3) moves in a spiral axial direction, so that the buffer reset device stores energy; when the external force decreases, the energy is released through the buffer reset device, so that the sliding hub (3) moves in a reverse spiral direction.

5. The adjustable buffer slip axial flow pump impeller according to claim 1, characterized in that: The fixed rotation direction of the guide cap (1) is opposite to the rotation direction of the axial flow pump impeller.

Images