Spiral centrifugal pump volute structure suitable for pumping high-viscosity fluid
By combining the volute shell structure of the radial and axial spiral sections in the spiral centrifugal pump, the problem of insufficient head during high viscosity fluid delivery is solved, efficient and stable fluid delivery is achieved, and the head and equipment life are improved.
Patent Information
- Application Number
- CN202422597555.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-28
AI Technical Summary
Existing spiral centrifugal pumps have too low head when transporting high viscosity fluid, resulting in clogging and impeller damage, making them unable to operate efficiently.
The volute shell structure is adopted that combines the radial helical section and the axial helical section to increase the flow passage through the cross-flow area and reduce fluid return. Through the design of the axial helical rise angle and neck section, a smooth transition of the fluid is achieved, avoiding blockage and energy loss.
It improves the head and efficiency of the spiral centrifugal pump, avoids high viscosity fluid blockage and impeller damage, and extends the equipment life.
Smart Images
Figure CN223152380U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a pump housing structure, specifically a volute structure of a screw centrifugal pump. Background Art
[0002] The screw centrifugal pump is a special type of impurity pump with a special structure. The rotor is equipped with screw blades, which can be divided into a spiral section and a centrifugal section. This special structure combines the advantages of a positive displacement pump and a centrifugal pump, and has good anti-blocking performance, passing performance, suction performance and anti-cavitation performance. At present, the head of domestic existing screw centrifugal pumps is generally low, especially for the working conditions of transporting high-viscosity materials, the pump head is even lower compared with the water transportation working conditions.
[0003] It is found through research that the head of the screw centrifugal pump is greatly affected by the shape of the volute. The traditional volute structure is generally a radial spiral structure. As the spiral expansion angle increases, the end face area of the volute gradually increases. Applying this traditional radial spiral volute structure, the pump can achieve a higher head when transporting water, but when transporting high-viscosity materials, the head will decrease significantly, and even cannot meet the engineering requirements. Summary of the Utility Model
[0004] The utility model aims to solve the problem of too low head when the screw centrifugal pump transports high-viscosity materials, and provides a volute structure of a screw centrifugal pump for pumping high-viscosity fluids. By combining the radial spiral section and the axial spiral section of the volute, a higher head output of the screw centrifugal pump is achieved.
[0005] To achieve the above technical objectives, the utility model provides the following technical solutions:
[0006] A volute structure of a screw centrifugal pump suitable for pumping high-viscosity fluids, characterized in that: it includes a radial spiral section, an axial spiral section and an axial outflow section. The radial spiral section, the axial spiral section and the axial outflow section are connected as a whole to form a volute structure. The radial spiral section has a rectangular hollow cavity for accommodating the impeller of the screw centrifugal pump. The end of the radial spiral section is connected to the axial spiral section. The axial spiral section spirally extends along the axis. The end of the axial spiral section is communicated with the axial outflow section. The rectangular hollow cavity is communicated with the inner cavity of the axial spiral section. A driving device connection flange is arranged in the middle of the volute top cover on the inner side of the radial spiral section of the volute.
[0007] The axial outflow section of the volute has a necking section, an expansion pipe and an outlet flange. The necking section is communicated with the inner cavity of the axial spiral section and is sequentially connected to the expansion pipe and the outlet flange along the axis.
[0008] The axial spiral section has an axial spiral lift angle of 3° to 9°.
[0009] The radial spiral section of the volute has a rectangular flow cross-section.
[0010] The center of the axial outflow section of the volute is located at the 360° section of the radial spiral section.
[0011] There is a transition arc at the connection between the necking section and the axial spiral section.
[0012] The axial spiral section starts at the 90° section of the radial spiral section.
[0013] With the above solution, the utility model has at least the following advantages:
[0014] The technical solution of this application adds an axial spiral section to the volute, making it have an axial spiral lift angle of 3° to 9°. While ensuring that the radial length remains unchanged, it increases the cross-sectional area of the flow passage, avoiding the blockage phenomenon caused by excessive viscosity when the screw centrifugal pump transports high-viscosity fluids, resulting in the pump being unable to operate efficiently and continuously. At the same time, it also reduces the damage of the impeller caused by the impeller blades working under high pressure load and reduces the phenomenon of shortened lifespan.
[0015] The axial outflow section has a necking section, which reduces the fluid backflow phenomenon, avoids the generation of vortices, thereby reducing energy loss and improving the head and efficiency of the screw centrifugal pump. There is an arc transition at the connection between the necking section and the axial spiral section to achieve smooth fluid transition and realize non-blocking and high-efficiency operation.
[0016] The above description is only an overview of the technical solution of the utility model. In order to be able to more clearly understand the technical solution of the utility model and implement it according to the content of the specification, the following preferred examples of the present invention are described in detail in conjunction with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0018] Figure 1 It is a front view structural schematic diagram of a volute structure of a screw centrifugal pump suitable for pumping high-viscosity fluids proposed according to the present utility model;
[0019] Figure 2 It is a top view schematic diagram of a volute structure of a screw centrifugal pump suitable for pumping high-viscosity fluids proposed according to the present utility model;
[0020] Figure 3 It is a front three-dimensional structural schematic diagram of a volute structure of a screw centrifugal pump suitable for pumping high-viscosity fluids proposed according to the present utility model;
[0021] Figure 4 It is a reverse three-dimensional structure schematic diagram of a volute structure of a screw centrifugal pump suitable for pumping high-viscosity fluids proposed according to the present utility model;
[0022] Figure 5 It is an external characteristic curve graph of the volute structure of the screw centrifugal pump proposed by applying the present utility model.
[0023] As Figures 1 to 4 shown, 1 is the radial spiral section, 2 is the axial spiral section, 3 is the axial outflow section, 4 is the rectangular hollow cavity, 5 is the inner cavity of the axial spiral section, 6 is the driving device connection flange, 2.1 is the transition arc, 3.1 is the necking section, 3.2 is the expansion pipe, and 3.3 is the outlet flange. Specific embodiments
[0024] The following combines the drawings and examples to further describe in detail the specific embodiments of the present utility model. The following examples are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.
[0025] See Figures 1 to 4 , a volute structure of a screw centrifugal pump suitable for pumping high-viscosity fluids according to a preferred embodiment of the present utility model, characterized in that: it includes a radial spiral section 1, an axial spiral section 2 and an axial outflow section 3. The radial spiral section 1, the axial spiral section 2 and the axial outflow section 3 are connected as a whole to form a volute structure. The radial spiral section 1 has a rectangular hollow cavity 4 for accommodating the impeller of the screw centrifugal pump. The end of the radial spiral section 1 is connected to the axial spiral section 2. The axial spiral section 2 extends spirally along the axis. The end of the axial spiral section 2 is communicated with the axial outflow section 3. The rectangular hollow cavity 4 is communicated with the inner cavity 5 of the axial spiral section. A driving device connection flange 6 is arranged in the middle of the volute top cover on the inner side of the volute radial spiral section.
[0026] The axial outflow section of the volute has a necking section 3.1, an expansion pipe 3.2 and an outlet flange 3.3. The necking section 3.1 is communicated with the inner cavity 5 of the axial spiral section and is connected to the expansion pipe 3.2 and the outlet flange 3.3 in sequence along the axis.
[0027] The axial spiral section 2 has an axial spiral lift angle of 3° to 9°.
[0028] The volute radial spiral section 1 has a rectangular flow cross-section.
[0029] The center of the volute axial outflow section 3 is located at the 360° section of the radial spiral section 1.
[0030] The connection between the necking section 3.1 and the axial spiral section 2 has a transition arc 2.1.
[0031] The axial spiral section 2 starts at the 90° section of the radial spiral section 1.
[0032] The working principle of the utility model is as follows:
[0033] The solution of this application enables the screw centrifugal pump to better adapt to pumping high-viscosity fluids and operate efficiently. When an ordinary screw centrifugal pump pumps high-viscosity fluids, the fluidity is poor, and problems such as viscosity and reverse flow are likely to occur. During the transportation process, it often accumulates in the pump body, resulting in a decrease in transportation efficiency and an increased risk of equipment blockage. The rectangular hollow cavity 4 has a sufficiently large fluid flow cross-sectional area, which can adapt to large-flow working conditions and avoid blockage caused by viscosity when transporting high-viscosity fluids. The axial screw section 2 has an axial screw lift angle of 3° to 9°. This structure can ensure that the radial dimension remains unchanged, expand the fluid flow cross-sectional area, play a role in promoting the fluid, increase the velocity of the fluid in the flow channel, reduce the residence time in the flow channel, and cooperate with the volute axial outflow section 3 to avoid the occurrence of outlet backflow and reduce the generation of vortices in the volute axial outflow section 3, making the fluid flow more stable. Finally, when pumping high-viscosity fluids, the operating efficiency is improved, the operation of the screw centrifugal pump is ensured to be stable, and blockage phenomena are avoided.
[0034] When the technical solution of this application is in use, the impeller can be installed in the rectangular hollow cavity 4 of the volute radial screw section 1 through a rotating shaft. When the impeller rotates, the fluid can flow through the rectangular hollow cavity 4 and the inner cavity 5 of the axial screw section to the axial outflow section 3, and different screw lift angles can be selected according to the viscosity of different working environments to increase the head and efficiency of the screw centrifugal pump, thereby avoiding the impeller working under high pressure load. Especially when operating in a large-flow working area, this advantage is more prominent. If it is applied to the production of screw centrifugal pumps, the working efficiency and service life of the product can be improved.
[0035] By comparing with and without the axial screw section, the technical solution of this application clearly shows that when pumping a fluid with a viscosity of 2000 mm 2 / s, the pump with the axial screw section 2 can increase the head by 24.98% and the efficiency by 3.6%. Moreover, at high flow rates, the pump with the axial screw section 2 has more advantages.
[0036] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationships indicated by terms such as "front", "rear", "left", "right", "circumferential", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model. Unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, unless otherwise clearly defined. The above specifically describes the preferred embodiments of the present utility model, but the present utility model is not limited to the embodiments.
Claims
1. A volute structure of a screw centrifugal pump applicable to pumping high-viscosity fluids, characterized in that: It includes a radial spiral section, an axial spiral section and an axial outflow section. The radial spiral section, the axial spiral section and the axial outflow section are integrally connected to form a volute structure. The radial spiral section has a rectangular hollow cavity for accommodating the impeller of the screw centrifugal pump. The end of the radial spiral section is connected to the axial spiral section. The axial spiral section extends spirally along the axis. The end of the axial spiral section is communicated with the axial outflow section. The rectangular hollow cavity is communicated with the inner cavity of the axial spiral section. A driving device connecting flange is arranged in the middle of the volute top cover on the inner side of the radial spiral section of the volute.
2. The volute structure of a screw centrifugal pump applicable to pumping high-viscosity fluids according to claim 1, characterized in that: The axial outflow section of the volute has a necking section, an expansion pipe and an outlet flange. The necking section is communicated with the inner cavity of the axial spiral section and is sequentially connected with the expansion pipe and the outlet flange along the axis.
3. A volute structure of a screw centrifugal pump applicable to pumping high-viscosity fluids according to claim 1, characterized in that: The axial spiral section has an axial spiral lift angle of 3° to 9°.
4. A volute structure of a screw centrifugal pump applicable to pumping high-viscosity fluids according to claim 1, characterized in that: The radial spiral section of the volute has a rectangular flow passage cross-section.
5. The volute structure of a screw centrifugal pump applicable to pumping high-viscosity fluids according to claim 1, characterized in that: The center of the axial outflow section of the volute is located at the 360° section of the radial spiral section.
6. The spiral centrifugal pump volute structure applicable to pumping high-viscosity fluids according to claim 1, characterized in that: A transition arc is provided at the connection between the necking section and the axial spiral section.
7. A volute structure of a screw centrifugal pump applicable to pumping high-viscosity fluids according to claim 1, characterized in that: The axial spiral section starts at the 90° section of the radial spiral section.