Centrifugal pumps used for conveying media containing solid particles

Abstract

This invention discloses a centrifugal pump for conveying media containing solid particles, comprising a pump body, an impeller, and a discharge chamber. The discharge chamber is annular, and at least one spiral guide vane extending spirally along its inner wall is fixedly connected to the inner wall of the annular discharge chamber. The spiral guide vane and the inner wall of the discharge chamber together form a guide channel, which guides the fluid from the impeller outlet to the outlet of the discharge chamber in a spiral flow. This invention forces the fluid to flow in an orderly manner through the spiral guide vane, minimizing traditional impact and eddy current losses. Moreover, the spiral guide channel forces the fluid to generate a spiral upward motion, generating continuous centrifugal force and upward force on the solid particles, making them difficult to settle, thus solving the problem of particle accumulation in the discharge chamber.

Description

Technical Field

[0001] This utility model relates to the field of fluid machinery technology, specifically to a centrifugal pump for conveying media containing solid particles. Background Technology

[0002] Centrifugal pumps are common fluid transport devices widely used in industry, agriculture, urban water supply, and many other fields. They accelerate fluids through the high-speed rotation of an impeller and then deliver them for transporting liquids such as water, chemicals, and slurries. However, when centrifugal pumps are used to transport media containing solid particles, the limitations of conventional designs become apparent. After being thrown out at high speed by the impeller, the fluid enters the space of the volute. Within this open volute, due to changes in flow velocity, the fluid undergoes violent impacts and swirling eddies, resulting not only in hydraulic losses but also a significant reduction in the overall efficiency of the pump. More seriously, due to the lower fluid velocity within the volute, solid particles settle and accumulate in the flow channel, especially in dead corners or low-speed areas of the volute. This accumulation of particles can easily clog the flow channel, preventing the fluid from flowing smoothly. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is: how to provide a centrifugal pump for conveying media containing solid particles that can reduce flow loss and effectively suppress solid particle deposition.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A centrifugal pump for conveying media containing solid particles includes a pump body, an impeller, and a discharge chamber. The discharge chamber is an annular discharge chamber, and at least one spiral guide vane extending spirally along its inner wall is fixedly connected to the inner wall of the annular discharge chamber. The spiral guide vane and the inner wall of the discharge chamber together form a guide channel, which is used to guide the fluid from the impeller outlet to the outlet of the discharge chamber in a spiral flow.

[0006] In this invention, the spiral guide vanes guide the fluid along a spiral path from the impeller outlet to the outlet of the discharge chamber, reducing violent eddies and impacts within the discharge chamber. This results in smoother fluid flow, reduced hydraulic losses, and improved pump efficiency. Furthermore, the guide channel effectively directs media containing solid particles to the outlet, preventing their deposition and accumulation in low-speed zones or dead zones within the discharge chamber. This ensures smoother fluid flow and enhances pump efficiency.

[0007] As an optimization, the flow guide channel is a diffusion-type channel, with its cross-sectional area gradually increasing from the end closer to the impeller towards the end closer to the outlet of the pressure chamber. This structure facilitates the efficient conversion of fluid velocity energy into pressure energy, reducing velocity impact losses and friction losses.

[0008] As an optimization, the flow channel is a non-diffusion type channel, and its cross-sectional area remains constant from the end near the impeller to the end near the outlet of the discharge chamber. This structure helps maintain a high flow rate and is particularly suitable for conveying high-concentration, easily settling media, effectively preventing particles from depositing and clogging the flow channel.

[0009] As an optimization, the tangential extension direction of the spiral outlet end of the spiral guide vane is parallel to the centerline direction of the outlet of the discharge chamber. This structure ensures that the fluid flows in a direction that is essentially consistent with the direction of the outlet pipe when leaving the guide channel, achieving smooth fluid discharge and further reducing local hydraulic losses and impacts at the outlet.

[0010] As an optimization, the helical guide vanes can control various flow rates by adjusting their number of heads or pitch. Users can select or replace the helical guide vanes with appropriate parameters according to actual operating conditions, thereby achieving customized adjustment of pump performance.

[0011] As an optimization, the spiral guide vanes are integrally cast with the pump body. This manufacturing method ensures the overall strength, rigidity, and sealing of the structure, avoids leakage and structural weaknesses that may occur with separate connections, and also improves production efficiency and consistency.

[0012] As an optimization, the outer surface of the helical guide vanes is covered with a wear-resistant coating. Since the conveying medium contains solid particles, this wear-resistant coating (such as a ceramic coating or a polymer wear-resistant material) can significantly improve the surface hardness and corrosion resistance of the helical guide vanes, thereby extending their service life and reducing maintenance costs.

[0013] Compared with existing technologies, this invention uses spiral guide vanes to force the fluid to flow in an orderly manner, minimizing traditional impact and eddy current losses. Moreover, the spiral guide channel forces the fluid to generate a spiral upward motion, producing a continuous centrifugal force and upward force on solid particles, making them difficult to settle and solving the problem of particle accumulation in the extrusion chamber. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model 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 utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0016] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] Example 1

[0018] like Figure 1As shown, the centrifugal pump for conveying media containing solid particles in this specific embodiment includes a pump body 1, an impeller 2, and a discharge chamber 3. The discharge chamber 3 is an annular discharge chamber. At least one spiral guide vane 4 extending spirally along its inner wall is fixedly connected to the inner wall of the annular discharge chamber. The spiral guide vane 4 and the inner wall of the discharge chamber 3 enclose a guide channel, which is used to guide the fluid from the outlet of the impeller 2 to the outlet of the discharge chamber 3 in a spiral flow.

[0019] In this specific embodiment, the flow guiding channel is a non-diffusion type channel, and its cross-sectional area remains constant from the end near the impeller 2 towards the end near the outlet of the discharge chamber. This design is particularly suitable for conveying media with extremely high concentrations, large particles, and a high susceptibility to static settling (such as dense tailings slurry). It maintains a high and uniform flow velocity in the discharge chamber, and uses strong carrying capacity to prevent particle deposition in any section. Although the energy conversion efficiency is slightly lower than that of the diffusion type, its anti-clogging reliability is extremely high.

[0020] In this specific embodiment, the tangential extension direction of the spiral outlet end of the spiral guide vane 4 is parallel to the centerline direction of the outlet of the extrusion chamber 3.

[0021] In this specific embodiment, the spiral guide vane 4 can control various flow rates by adjusting its number of heads or pitch.

[0022] In this specific embodiment, the spiral guide vane 4 and the pump body 1 are integrally cast.

[0023] In this specific embodiment, the outer surface of the spiral guide vane 4 is covered with a wear-resistant coating.

[0024] During operation, the drive mechanism rotates the centrifugal pump impeller at high speed. The medium is drawn axially into the center of the impeller, gains energy after work is done by the impeller, and is then radially ejected at high speed from the impeller outlet into the annular discharge chamber. Inside the annular discharge chamber, the fluid is guided by helical guide vanes and forced to flow upward along the helical guide channel. During this process, the chaotic kinetic energy of the fluid is organized into an ordered helical motion. Throughout the process, the spiral upward flow effectively suppresses eddies and particle settling, and the wear-resistant coating protects the surface of the flow channel, thus achieving efficient, reliable, and long-life conveying.

[0025] Example 2

[0026] In another embodiment of this utility model, the main difference from Embodiment 1 lies in the shape of the flow guiding channel. In this specific embodiment, the cross-sectional area of ​​the flow guiding channel 5 formed by the spiral guide vanes 4 gradually increases from the inlet to the outlet, forming a diffusion-type channel. The fluid velocity decreases during the spiral's forward movement, kinetic energy is efficiently converted into pressure energy, and it is smoothly discharged from the spiral outlet end parallel to the outlet direction.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail can be made without departing from the spirit and scope of this utility model as defined in the appended claims.

Claims

1. A centrifugal pump for pumping a solid particle containing medium comprising a pump body, an impeller and a discharge chamber, characterized in that: The discharge chamber is an annular discharge chamber. At least one spiral guide vane is fixedly connected to the inner wall of the annular discharge chamber. The spiral guide vane and the inner wall of the discharge chamber together form a guide channel. The guide channel is used to guide the fluid from the impeller outlet to the outlet of the discharge chamber in a spiral flow.

2. A centrifugal pump for pumping a solid particle containing medium according to claim 1, characterized in that: The flow guide channel is a diffusion channel, and its cross-sectional area gradually increases from the end near the impeller to the end near the outlet of the discharge chamber.

3. The centrifugal pump for pumping a solid particle containing medium according to claim 1, characterized in that: The flow guide channel is a non-diffusion type channel, and its cross-sectional area remains unchanged from the end near the impeller to the end near the outlet of the discharge chamber.

4. The centrifugal pump for pumping a solid particle containing medium according to claim 1, characterized in that: The tangential extension direction of the spiral outlet end of the spiral guide vane is parallel to the centerline direction of the outlet of the extrusion chamber.

5. The centrifugal pump for pumping a solid particle containing medium according to claim 1, characterized in that: The spiral guide vanes can control various flow rates by adjusting their number of heads or pitch.

6. The centrifugal pump for pumping a solid particle containing medium according to claim 1, characterized in that: The spiral guide vanes are integrally cast with the pump body.

7. The centrifugal pump for pumping a solid particle containing medium according to claim 1, characterized in that: The outer surface of the spiral guide blade is covered with a wear-resistant coating.

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