An impeller water inlet runner

Abstract

The utility model discloses a kind of impeller water inlet runner, including impeller main body and the main blade being set in the middle part runner in impeller main body, the middle part of the impeller main body is fixed with the shaft core for with external rotating shaft connection, one end of the main blade is fixedly connected with the outer wall of shaft core, the rim of the one side of the main blade is provided with integrally-formed water guide blade, the rim of the water guide blade is provided with integrally-formed first arc-shaped edge;The utility model is by setting first arc-shaped edge in the rim of water guide blade, and setting second arc-shaped edge at the connecting portion of ring wall and shell, the runner of the water inlet of impeller is increased fillet, so that connecting portion thickens, structure is more stable, when liquid enters impeller, it can more smoothly flow through runner, the design of arc-shaped edge can reduce the probability of bubble generated due to liquid flow obstruction, thereby reduce the number of bubble being brought into high pressure area, reduce the erosion degree of cavitation to impeller.

Description

Technical Field

[0001] This utility model relates to the field of impeller anti-cavitation technology, specifically to an impeller inlet flow channel. Background Technology

[0002] Cavitation is a process in which vapor or gas bubbles are generated inside a liquid when the local pressure drops below its saturated vapor pressure. These bubbles are then carried to a high-pressure area and rapidly collapse, generating extremely strong shock waves and microjets in a very short time. These shock waves and microjets repeatedly act on solid surfaces such as impellers, pipe walls, valves, and propellers, leading to material fatigue, spalling, and erosion damage.

[0003] The connection between the inlet flow channel blades and the flow channel wall of existing impellers is mostly a right angle or acute angle transition. This causes the liquid to collide violently with the blades after entering the flow channel. This not only increases the flow resistance, but also generates a large number of bubbles due to local turbulence and pressure fluctuations. These bubbles are carried into the high-pressure area with the liquid flow and will quickly collapse. The resulting extremely strong shock waves and micro-jet jets repeatedly act on the tip of the outer edge of the impeller blades, the blade inlet edge, the outer edge of the front cover plate, and the corresponding pump casing wall, gradually forming annular erosion zones and affecting the service life of the impeller. Utility Model Content

[0004] The purpose of this invention is to provide an impeller inlet flow channel. By setting an arc edge on the edge of the guide vane and optimizing the flow channel at the impeller inlet by adding rounded corners, the resistance formed by the impeller and the vane can be reduced in the low-pressure area of ​​the inlet after water enters the impeller, reducing the bubbles formed by the collision between the liquid and the vane, thereby reducing the bubbles carried to the high-pressure area and reducing the degree of water cavitation erosion.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an impeller inlet channel, comprising an impeller body and a main blade disposed in the middle channel of the impeller body, wherein a shaft core for connection to an external rotating shaft is fixed in the middle of the impeller body, one end of the main blade is fixedly connected to the outer wall of the shaft core, and an integrally formed water guide blade is provided on one side edge of the main blade, wherein an integrally formed first arc-shaped edge is provided on the edge of the water guide blade.

[0006] Preferably, there are several main blades, and each main blade has a set of water guide vanes, and the several main blades are arranged in a circular array.

[0007] Preferably, the water guide vanes are inclined relative to the main vanes, and a low-pressure zone is formed between two adjacent water guide vanes.

[0008] Preferably, the impeller body includes a shell, and an annular wall is fixed on one side of the shell. An inlet is formed between the inner cavity of the annular wall and the adjacent main blades.

[0009] Preferably, the impeller body further includes several sets of slots formed on the outer wall of the outer casing, and the slots are connected to the water inlet to form a flow channel.

[0010] Preferably, the connection between the ring wall and the outer shell is provided with an integrally formed second arc-shaped edge, and several sets of the slots are arranged in a circumferential array.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model adds rounded corners to the flow channel at the impeller inlet by setting a first arc-shaped edge on the edge of the guide vanes and a second arc-shaped edge at the connection between the annular wall and the outer shell. This thickens the connection, making the structure more stable. When the liquid enters the impeller, it can flow more smoothly through the flow channel, reducing the impact and resistance between the liquid and the vanes. Especially in the low-pressure area formed by the guide vanes, the arc-shaped edge design can reduce the probability of bubbles being generated due to obstructed liquid flow, thereby reducing the number of bubbles carried into the high-pressure area, reducing the degree of cavitation erosion on the impeller, and extending the service life of the impeller.

[0013] 2. In this invention, the guide vanes on each main blade are inclined relative to the main blade, forming a reasonable low-pressure zone between adjacent guide vanes. Combined with the slot connecting to the inlet, this forms a complete flow channel, allowing the liquid to flow along a preset path. The curved edges eliminate local turbulence and dead zones within the flow channel, resulting in a smoother water flow and reduced energy loss. Attached Figure Description

[0014] Figure 1 This is an isometric drawing of this utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the longitudinal section structure of the outer shell of this utility model;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the outer shell of this utility model.

[0018] In the diagram: 1. Impeller body; 2. Main blades; 3. Shaft core; 4. Guide vanes; 5. First arc-shaped edge; 6. Low-pressure zone;

[0019] 101. Outer shell; 102. Circular wall; 103. Water inlet; 104. Groove; 105. Second arc-shaped edge. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 This utility model provides a technical solution: an impeller inlet flow channel, including an impeller body 1 and main blades 2 disposed in the flow channel in the middle of the impeller body 1. The main blades 2 serve as the main water conveying component, undertaking the function of liquid conveying. A shaft core 3 is fixed in the middle of the impeller body 1 for connection with an external rotating shaft. The shaft core 3 achieves the connection with the external rotating shaft to transmit power, such as... Figure 4 As shown, a keyway for connecting to an external rotating shaft is provided in the middle of the shaft core 3. One end of the main blade 2 is fixedly connected to the outer wall of the shaft core 3. An integrally formed water guide blade 4 is provided on one side edge of the main blade 2. The water guide blade 4 assists in guiding the direction of liquid flow. An integrally formed first arc-shaped edge 5 is provided on the edge of the water guide blade 4. The first arc-shaped edge 5 optimizes the transition shape of the edge of the water guide blade 4 and solves the problem of water flow impact caused by sharp angle transition in the prior art.

[0022] The main blades 2 are provided in a plurality of manner, and each main blade 2 has a set of guide vanes 4. The plurality of main blades 2 are arranged in a circumferential array. The multiple main blades 2 are distributed in a circumferential array to ensure that the impeller is subjected to uniform force when rotating, and to avoid single-point overload. Each set of guide vanes 4 corresponds to one main blade 2, ensuring that each flow channel has an independent guiding structure and improving the uniformity of water flow distribution.

[0023] The guide vanes 4 are inclined relative to the main vanes 2, and a low-pressure zone 6 is formed between two adjacent guide vanes 4. The guide vanes 4 are inclined to adapt to the liquid flow trajectory and guide the water flow into the flow channel in a preset direction; the low-pressure zone 6 formed between adjacent guide vanes 4 enhances the liquid suction capacity by utilizing the pressure difference.

[0024] The impeller body 1 includes a housing 101, and an annular wall 102 is fixed to one side of the housing 101. An inlet 103 is formed between the inner cavity of the annular wall 102 and the adjacent main blades 2. The inlet 103 formed by the annular wall 102 and the main blades 2 provides an entry path for liquid, avoids disordered water flow impacting the inner wall of the impeller, reduces resistance and bubble generation caused by chaotic water inlet direction, and improves water inlet stability.

[0025] The impeller body 1 also includes several sets of slots 104 formed on the outer wall of the housing 101. The slots 104 are connected to the inlet 103 to form a flow channel. After the liquid enters the inlet 103 through the low-pressure zone 6, it flows out through the slots 104, ensuring that the liquid can flow along a preset path after entering the inlet 103.

[0026] The connection between the ring wall 102 and the outer shell 101 is provided with an integrally formed second arc-shaped edge 105. The connection between the ring wall 102 and the outer shell 101 is a position prone to cavitation. The provision of the second arc-shaped edge 105 can reduce the impact of water flow at this point. Several sets of slots 104 are arranged in a circumferential array.

[0027] In use, the external liquid first contacts the annular wall 102 of the impeller body 1. The annular wall 102 serves as the water inlet guide boundary of the impeller, and a second arc-shaped edge 105 is provided at the connection between it and the outer casing 101. The radius is designed according to the impeller specifications, usually 3-5 mm. Under the action of inertia, the water flows along the outside of the annular wall 102. When it reaches the connection position between the annular wall 102 and the outer casing 101, the second arc-shaped edge 105 eliminates the protruding obstacles of the traditional acute angle connection, allowing the water flow to smoothly transition to the inside of the annular wall 102 in a near-tangential direction, avoiding local turbulence caused by impacting the right-angle structure.

[0028] The water flow guided by the annular wall 102 enters the inlet 103. As the impeller rotates under the drive of the external shaft, the low-pressure zone 6 formed between the adjacent guide vanes 4 generates negative pressure. Under the action of the pressure difference, the water flow is actively sucked into the low-pressure zone 6.

[0029] The tilt angle of the guide vane 4 is set to 15°-30° to match the inertial direction of the water flow. The first arc-shaped edge 5 of the vane further guides the water flow along the curved surface of the arc edge, reducing the impact between the water flow and the vane.

[0030] The water entering the low-pressure zone 6 flows into the space between the main blade 2 and the outer casing 101 under the centrifugal force of the rotating impeller. At this time, the water continues to move through the flow channel formed by the inlet 103 and the slot 104 on the outer wall of the outer casing 101, and finally exits the impeller from the slot 104.

[0031] The impeller channel design allows bubbles to move in an orderly manner along a preset path with the water flow, instead of being directly carried into the high-pressure area by turbulence, reducing the possibility of bubbles collapsing near the wall. At the same time, the first arc-shaped edge 5 can reduce the amount of bubbles generated by liquid impact and reduce the degree of cavitation.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An impeller inlet flow channel, characterized in that: It includes an impeller body (1) and a main blade (2) disposed in the middle flow channel of the impeller body (1). A shaft core (3) for connecting to an external rotating shaft is fixed in the middle of the impeller body (1). One end of the main blade (2) is fixedly connected to the outer wall of the shaft core (3). An integrally formed water guide blade (4) is provided on one side edge of the main blade (2). An integrally formed first arc-shaped edge (5) is provided on the edge of the water guide blade (4).

2. The impeller inlet flow channel according to claim 1, characterized in that: The main blades (2) are provided in a plurality of manner, and each main blade (2) has a set of water guide blades (4), and the plurality of main blades (2) are arranged in a circular array.

3. The impeller inlet flow channel according to claim 2, characterized in that: The water guide blade (4) is inclined relative to the main blade (2), and a low-pressure zone (6) is formed between two adjacent water guide blades (4).

4. The impeller inlet flow channel according to claim 3, characterized in that: The impeller body (1) includes a shell (101), and an annular wall (102) is fixed on one side of the shell (101). An inlet (103) is formed between the inner cavity of the annular wall (102) and the adjacent main blade (2).

5. The impeller inlet flow channel according to claim 4, characterized in that: The impeller body (1) also includes several sets of slots (104) opened on the outer wall of the outer shell (101), and the slots (104) are connected to the water inlet (103) to form a flow channel.

6. The impeller inlet flow channel according to claim 5, characterized in that: The connection between the ring wall (102) and the outer shell (101) is provided with an integrally formed second arc-shaped edge (105), and several sets of the slots (104) are arranged in a circumferential array.

Images