Adjustable axial flow pump impeller with sliding buffering

Abstract

An adjustable axial flow pump impeller with sliding buffering, comprising a hub, a rotating shaft (10) and axial flow pump blades (4), wherein the rotating shaft is configured to drive the hub to rotate, the hub comprises a sliding hub (3) and an impeller hub (5), the impeller hub being in transmission fit with the rotating shaft, and the axial flow pump blades being mounted on an outer side of the sliding hub; several balls (2) are mounted between the inner ring of the sliding hub and the outer ring of the impeller hub for transmitting torque and enabling circumferential sliding between the sliding hub and the impeller hub when the axial flow pump blades are subjected to an external force; and a buffer reset device is provided between the sliding hub and the impeller hub for buffering the generated circumferential sliding and resetting the sliding hub. The survival rate of aquatic organisms after passing through an axial flow pump station is improved, thereby preventing significant damage and mortality of organisms.

Description

Adjustable buffer slip axial flow pump impeller TECHNICAL FIELD

[0001] The present application relates to the field of fluid machinery, in particular to an adjustable buffer slip axial flow pump impeller. BACKGROUND

[0002] A pump is a machine that transports or pressurizes fluid. It transmits mechanical energy or other external energy to the liquid, so that the liquid energy increases. Pumps are mainly used to transport water, oil, acid and alkali liquid, emulsion, suspension emulsion and liquid metal, etc. Liquid, gas mixture and liquid containing suspended solid can also be transported. According to the specific speed, the pump is divided into centrifugal pump, mixed flow pump, axial flow pump and tubular pump. The axial flow pump has large flow. Usually, the water quality of large water transfer projects is high, and the ecological environment is good, so there are more aquatic organisms.

[0003] However, the traditional fence cannot completely block the aquatic organisms, resulting in that part of the organisms are passively brought into the axial flow pump in the pump station, causing a certain degree of damage or direct death after passing through the impeller and guide vane. On the one hand, the biodiversity of the reservoir area is affected, and some endangered species may be difficult to recover; on the other hand, the death of aquatic organisms affects the water quality. Therefore, it is necessary to improve the ecological friendliness of the axial flow pump station and reduce the damage rate of aquatic organisms passing through the pump.

[0004] The patent technology with publication number CN102400947A proposes a forward sweep of the blade inlet edge, but in order to prevent sundries from winding, a thin blade rim and a thick hub are arranged, which makes the circumferential speed of the rim larger and the cutting force on the fish larger, so that the mortality of the fish increases. SUMMARY

[0005] In view of the deficiencies in the prior art, the present application provides an adjustable buffer slip axial flow pump impeller, which improves the survival rate of aquatic organisms after passing through the axial flow pump station and avoids a large amount of damage and death of organisms.

[0006] The present application achieves the above technical purpose through the following technical means.

[0007] An adjustable buffer slip axial flow pump impeller, comprising a hub, a rotating shaft and an axial flow pump blade, the rotating shaft is used for driving the hub to rotate, the hub comprises a slip hub and an impeller hub, the impeller hub is in transmission cooperation with the rotating shaft, and the axial flow pump blade is installed outside the slip hub; a plurality of balls are installed between the inner ring of the slip hub and the outer ring of the impeller hub, which are used for transmitting torque and making the slip hub and the impeller hub produce circumferential slip under the action of external force; a buffer reset device is arranged between the slip hub and the impeller hub, which is used for buffering the generated circumferential slip and resetting the slip hub.

[0008] Further, a plurality of paired arc-shaped grooves are arranged between the sliding hub inner ring and the impeller hub outer ring, respectively, and the paired arc-shaped grooves form ball mounting grooves, and a plurality of balls are placed in the ball mounting grooves.

[0009] Further, the inclination angle of the ball mounting groove is 45-90°, and the inclination direction of the arc-shaped groove is consistent with the reverse direction of the impeller rotation, so that the sliding hub is axially moved in a spiral manner under the action of an external force.

[0010] Further, the sliding hub inner ring is provided with a plurality of arc-shaped through grooves, and the impeller hub outer ring is provided with arc-shaped grooves closed at both ends, and the arc-shaped through grooves and the arc-shaped grooves closed at both ends form ball mounting grooves, and the arc-shaped grooves closed at both ends are used to constrain the movement of the balls in the grooves.

[0011] Further, one end of the impeller hub is provided with a positioning sealing ring, one end of the sliding hub is provided with a cavity, one end of the buffer reset device is connected with the cavity wall surface of the sliding hub, and the other end of the buffer reset device is connected with the positioning sealing ring; under the action of an external force, the buffer reset device is energized by the axial spiral movement of the sliding hub, and when the external force decreases, the energy is released by the buffer reset device, so that the sliding hub moves in a reverse spiral manner.

[0012] Further, one end of the rotating shaft is provided with a flow guide cap, and the rotation fixing direction of the flow guide cap is opposite to the rotating direction of the axial flow pump impeller; one end of the flow guide cap is provided with high steps and low steps in sequence according to the radial height, and the low steps are used for the axial positioning of the other end of the impeller hub; and the high steps support the sliding hub.

[0013] Further, the depth H of the high step is greater than the maximum compression amount of the buffer reset device, so as to block the gap generated by the movement of the sliding hub, improve the flow stability, and reduce the loss.

[0014] The beneficial effects of the present application are as follows:

[0015] 1. The adjustable buffer sliding axial flow pump impeller disclosed by the present application, the hub comprises a sliding hub and an impeller hub, the impeller hub is in transmission cooperation with a rotating shaft, and the sliding hub is externally provided with axial flow pump blades; a plurality of balls are arranged between the sliding hub inner ring and the impeller hub outer ring, the balls are supported and transmit torque, when the blades hit aquatic organisms, the reaction force of the organisms to the blades is transmitted to the balls, so that the sliding hub and the impeller hub generate circumferential sliding; and the buffer reset device can buffer the generated circumferential sliding, so as to reduce the rotating speed of the blades in a short time, thereby buffering the impact force between the blades and the organisms and reducing the damage to the organisms.

[0016] 2. The adjustable buffer slip axial flow pump impeller of the present application, due to the inclination angle of the ball mounting groove being 45-90°, the inclination direction of the arc-shaped groove being consistent with the reverse direction of the impeller rotation, the reaction force of the organism on the blade causing the slip hub screw to move axially.

[0017] 3. The adjustable buffer slip axial flow pump impeller of the present application, the depth H of the high step being greater than the maximum compression amount of the buffer reset device, the gap generated due to the movement of the slip hub being shielded, the flow stability being improved, and the loss being reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. The drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Fig. 1 is a semi-sectional view of the adjustable buffer slip axial flow pump impeller of the present application.

[0020] Fig. 2 is a radial sectional view of the adjustable buffer slip axial flow pump impeller of the present application.

[0021] Fig. 3 is an enlarged view of the flow guide cap of the adjustable buffer slip axial flow pump impeller of the present application.

[0022] Fig. 4 is an axial development view of the slip hub of the present application.

[0023] Fig. 5 is an axial development view of the impeller hub of the present application.

[0024] In the drawings:

[0025] 1 - flow guide cap; 2 - ball; 3 - slip 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 embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0027] In the description of the present application, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0028] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] As shown in FIG. 1 and FIG. 2, the adjustable buffer slip axial flow pump impeller of the present application comprises a hub, a rotating shaft 10 and an axial flow pump blade 4, the hub comprises a slip hub 3 and an impeller hub 5, the impeller hub 5 is driven by the rotating shaft 10 through a guide key cooperation transmission, the rotating shaft 10 is used to drive the impeller hub 5 to rotate; the axial flow pump blade 4 is installed outside the slip hub 3; a plurality of balls 2 are installed between the inner ring of the slip hub 3 and the outer ring of the impeller hub 5, a plurality of balls 2 placed in the ball installation groove can realize transmission torque, and the balls 2 can rotate freely in the ball installation groove, when the axial flow pump blade 4 is under external force, the slip hub 3 and the impeller hub 5 produce circumferential slip; a buffer reset device is arranged between the slip hub 3 and the impeller hub 5, which is used to buffer the generated circumferential slip and reset the slip hub 3. The adjustable buffer slip axial flow pump impeller of the present application, when the axial flow pump blade 4 hits aquatic organisms, the reaction force of the organisms to the axial flow pump blade 4 is transmitted to the balls 2, so that the slip hub 3 and the impeller hub 5 produce circumferential slip; and the buffer reset device can buffer the generated circumferential slip, reduce the blade rotation speed in a short time, so as to buffer the impact force between the blade and the organism and reduce the damage to the organism.

[0030] The inner ring of the sliding hub 3 and the outer ring of the impeller hub 5 are respectively provided with a plurality of paired arc-shaped grooves, which constitute a ball mounting groove, and a plurality of balls 2 are placed in the ball mounting groove. 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 closed at both ends, which facilitate the installation of the balls 2. The arc-shaped through grooves and the arc-shaped grooves closed at both ends constitute a ball mounting groove, and the arc-shaped grooves closed at both ends are used to constrain the movement of the balls 2 in the groove.

[0031] In order to make the sliding hub 3 move axially in a spiral, the inclination angle of the ball mounting groove is 45-90°, and the inclination direction of the arc-shaped groove is consistent with the opposite direction of the rotation of the impeller. In this way, the reaction force of the organism on the blade can make the sliding hub move axially in a spiral, which can protect the underwater organism. Here, the inclination angle of the arc-shaped groove is generally considered to be the spiral angle, which can be the included angle between the arc-shaped groove after the arc-shaped groove is developed axially and the side of the circumference development, as shown in FIGS. 4 and 5. The inclination angle in the figure is α.

[0032] In the embodiment shown in FIGS. 4 and 5, the two symmetrical ball mounting grooves between the inner ring of the sliding hub 3 and the outer ring of the impeller hub 5 have an inclination angle of 90°, 75°, 60° or 45°. FIGS. 4 and 5 show the schematic diagrams of the ball mounting grooves with inclination angles of 90°, 75°, 60° and 45°, but it does not mean that the sliding hub 3 has ball mounting grooves with all four angles. Generally, there is only one kind of ball mounting groove with an inclination angle. The balls will fill the ball mounting groove with one kind of inclination angle, and the greater the inclination angle, the greater the circumferential displacement, and the more obvious the buffering effect. If a ball mounting groove with an inclination angle of 90° is used, there is no buffering effect. For different underwater organisms, the buffering effect of the axial flow pump impeller can be adjusted by simultaneously replacing the sliding hub 3 and the impeller hub 5 with different installation groove inclination angles.

[0033] The buffering reset device in the embodiment is a buffer spring 7. One end of the impeller hub 5 is provided with a positioning sealing ring 8, and one end of the sliding hub 3 is provided with a cavity. One end of the buffer spring 7 is connected with the cavity wall surface of the sliding hub 3, and the other end of the buffer spring 7 is connected with the positioning sealing ring 8. Under the action of external force, the buffer spring 7 is energized by the spiral axial movement of the sliding hub 3, so that resistance is generated to slow down the axial movement of the sliding hub 3. When the external force decreases, the energy is released by the buffering reset device to make the sliding hub 3 move in the opposite direction in a spiral.

[0034] As shown in Fig. 4, the rotating shaft 10 is installed with a flow guide cap 1 at one end, the rotating fixed direction of the flow guide cap 1 is opposite to the rotating direction of the axial flow pump impeller; the flow guide cap 1 is sequentially provided with a high step 11 and a low step 12 according to the radial height, the low step 12 is used for the axial positioning of 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 amount of the buffer reset device, can shield the gap generated due to the movement of the sliding hub, improve the flow stability, and reduce the loss.

[0035] The present application adopts a variety of friendly designs for the axial flow pump impeller, reduces the relative speed when the axial flow pump blade collides with aquatic organisms, reduces the scraping damage to the biological skin, and improves the biological safety.

[0036] It should be understood that although the present specification is described according to each embodiment, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, the skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined to form other embodiments which can be understood by the skilled in the art.

[0037] The series of detailed descriptions listed above are only specific descriptions for the feasible embodiments of the present application, and are not used to limit the protection scope of the present application, and any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. An adjustable buffer slip axial flow pump impeller comprising a hub, a rotating shaft (10) for driving the hub to rotate, and axial flow pump blades (4), characterized in that, The hub comprises a sliding hub (3) and an impeller hub (5), the impeller hub (5) is in driving cooperation with a rotating shaft (10), the sliding hub (3) is externally provided with an axial flow pump blade (4); a plurality of balls (2) are arranged between the inner ring of the sliding hub (3) and the outer ring of the impeller hub (5) for transmitting torque and for enabling the sliding hub (3) and the impeller hub (5) to slide circumferentially under the action of an external force; a buffer reset device is arranged between the sliding hub (3) and the impeller hub (5) for buffering the circumferential sliding and resetting the sliding hub (3).

2. The adjustable cushion slip axial pump impeller of claim 1, wherein, A plurality of matched arc-shaped grooves are arranged between the inner ring of the sliding hub (3) and the outer ring of the impeller hub (5) respectively, the matched arc-shaped grooves form ball mounting grooves, and a plurality of balls (2) are arranged in the ball mounting grooves.

3. The adjustable cushion slip axial pump impeller of claim 2, wherein, The inclination angle of the ball mounting groove is 45-90°, the inclination direction of the ball mounting groove is opposite to the rotating direction of the impeller, and the sliding hub (3) is axially moved spirally under the action of an external force.

4. The adjustable cushion slip axial pump impeller of claim 2, wherein, The inner ring of the sliding hub (3) is provided with a plurality of arc-shaped through grooves, 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 form ball mounting grooves, and the arc-shaped grooves with closed ends are used for restricting the movement of the balls (2) in the grooves.

5. The adjustable cushion slip axial pump impeller of claim 3, wherein, One end of the impeller hub (5) is provided with a positioning sealing ring (8), one end of the sliding hub (3) is provided with a cavity, one end of the buffer reset device is connected to the wall surface of the cavity 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 buffer reset device is charged by the axial spiral movement of the sliding hub (3), and when the external force decreases, the energy of the buffer reset device is released to enable the sliding hub (3) to move reversely spirally.

6. The adjustable cushion slip axial pump impeller of claim 1, wherein, One end of the rotating shaft (10) is provided with a flow guide cap (1), and the rotating fixation direction of the flow guide cap (1) is opposite to the rotating direction of the axial flow pump impeller; One end of the flow guide cap (1) is sequentially provided with a high step (11) and a low step (12) according to the radial height, the low step (12) is used for the axial positioning of the other end of the impeller hub (5), and the high step (11) supports the sliding hub (3).

7. The adjustable cushion slip axial pump impeller of claim 6, wherein, The depth H of the high step (11) is greater than the maximum compression amount of the buffer reset device.

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