Sintered ceramic impeller structure

Abstract

The utility model provides a sintered ceramic impeller structure which comprises an impeller framework, an impeller body and a bonding layer. The impeller framework is used for sleeving a centrifugal pump shaft; the impeller body is sleeved on the impeller framework, and a polygonal ring cavity is formed between the impeller body and the impeller framework; the polygonal annular cavity is filled with the bonding layer, and the bonding layer, the impeller framework and the impeller body are bonded and fixed together. According to the sintered ceramic impeller structure, the impeller body provided with the polyhedral annular cavity is arranged on the impeller framework in the sleeving mode, the side wall, inserted into the polyhedral annular cavity, of the impeller framework is limited by the inner wall of the polyhedral annular cavity, and the connection strength between the impeller framework and the impeller body can be improved; the impeller framework is ensured to transmit the torque of the pump shaft to the impeller body; when the impeller framework is sleeved with the impeller body, the gap exists between the impeller framework and the impeller body and is filled with the bonding layer, parts do not need to be precisely polished, the production cost is reduced, and the cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary centrifugal pump equipment, and in particular relates to a sintered ceramic impeller structure. Background Art

[0002] Rotary centrifugal pumps use centrifugal force and centrifugal inertia to generate pressure, thereby transporting liquids into pipelines. As a key component of a rotary centrifugal pump, the impeller, and the material selection have a crucial impact on the pump's performance and service life. Ceramic materials offer advantages such as low density, high hardness, high temperature resistance, and corrosion resistance. They perform particularly well in harsh environments such as high temperature, high pressure, and severe corrosion. Using ceramic materials to manufacture impellers not only improves the pump's corrosion resistance, wear resistance, and temperature adaptability, but also extends the impeller's service life.

[0003] In the existing technology, there are two methods for joining ceramic impellers: direct bonding and inlaying. Direct bonding is low-cost but has poor reliability, while inlaying is high-cost and complex. Utility Model Content

[0004] The embodiment of the utility model provides a sintered ceramic impeller structure, aiming to improve the reliability of the ceramic impeller while reducing the cost.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a sintered ceramic impeller structure, including an impeller skeleton, an impeller body and a bonding layer; the impeller skeleton is used to be mounted on the pump shaft of a centrifugal pump; the impeller body is mounted on the impeller skeleton and forms a polygonal annular cavity with the impeller skeleton; the bonding layer is filled in the polygonal annular cavity and is bonded and fixed to the impeller skeleton and the impeller body.

[0006] In a possible implementation, a side of the impeller skeleton away from the pump shaft of the centrifugal pump extends in all directions to form a limiting step, and the limiting step abuts against the axial direction of the impeller body.

[0007] In a possible implementation, a groove is provided on the edges of the polygonal annular cavity on one side away from the pump shaft of the centrifugal pump, and the inner wall of the groove abuts against the step surface of the limiting step.

[0008] In one possible implementation, the impeller body includes a front cover plate and a rear cover plate that are spaced apart, and a plurality of main blades connected between the front cover plate and the rear cover plate; the front cover plate is mounted on the pump shaft of the centrifugal pump, and the main blades are spaced apart along the circumference of the polygonal annular cavity, and liquid flow channels are formed between adjacent main blades.

[0009] In a possible implementation, a volume cavity is formed between the front cover plate, the rear cover plate and the main blades, and a liquid inlet communicating with the volume cavity is provided on the rear cover plate, and the edges around the liquid inlet are arc-shaped annular surfaces.

[0010] In a possible implementation, a plurality of guide vanes are provided at intervals on a side of the rear cover plate away from the front cover plate.

[0011] In a possible implementation, a plurality of auxiliary blades are spaced apart on a side of the front cover plate close to the rear cover plate, and each auxiliary blade is located between adjacent main blades.

[0012] In a possible implementation, the bonding layer is a high molecular weight silicon carbide composite material.

[0013] In a possible implementation, an end of the impeller skeleton away from the pump shaft of the centrifugal pump is a convex surface.

[0014] In a possible implementation, both ends of the impeller skeleton are provided with a wear-resistant coating.

[0015] The beneficial effects of the sintered ceramic impeller structure provided by the utility model are as follows: compared with the existing technology, the utility model adopts an impeller body provided with a polyhedron annular cavity, which is sleeved on the impeller skeleton, and the side wall of the impeller skeleton inserted into the polyhedron annular cavity is limited by the inner wall of the polyhedron annular cavity, which can increase the connection strength between the impeller skeleton and the impeller body, and ensure that the impeller skeleton transmits the torque of the pump shaft to the impeller body; the impeller body and the impeller skeleton are bonded by an adhesive layer, so that the main force for the impeller skeleton to transmit torque can also come from the adhesive force of the adhesive layer, ensuring the torque transmission of the impeller skeleton and enhancing the structural reliability of the ceramic impeller; the impeller skeleton can allow a small error in its own size. When the impeller body is sleeved on the impeller skeleton, there is a gap between the impeller skeleton and the impeller body and it is filled by the adhesive layer. There is no need for precision grinding of parts, which reduces production cost and saves cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic front view of the sintered ceramic impeller structure provided in an embodiment of the present utility model;

[0017] Figure 2 This is a side view of the impeller skeleton used in the embodiment of the present utility model;

[0018] Figure 3 This is a schematic front view of the structure of the impeller skeleton used in the embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the front view of the impeller body used in the embodiment of the present utility model;

[0020] Figure 5 A schematic diagram of the three-dimensional structure of a sintered ceramic impeller structure provided in an embodiment of the present utility model;

[0021] In the figure: 10, impeller skeleton; 11, limiting step; 20, impeller body; 21, front cover; 211, auxiliary blades; 22, rear cover; 221, guide vane; 23, main blades; 24, liquid flow channel; 25, volume cavity; 26, liquid inlet; 30, polygonal annular cavity; 31, slot; 40, bonding layer; 50, wear-resistant layer; 60, centrifugal pump shaft. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. 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" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0024] Please also refer to Figures 1 to 4 The sintered ceramic impeller structure provided by the present invention is now described. The sintered ceramic impeller structure comprises an impeller frame 10, an impeller body 20, and a bonding layer 40. The impeller frame 10 is adapted to be mounted on a centrifugal pump shaft 60. The impeller body 20 is mounted on the impeller frame 10, forming a polygonal annular cavity 30 therebetween. The bonding layer 40 fills the polygonal annular cavity 30 and is bonded to the impeller frame 10 and the impeller body 20.

[0025] It should be noted that the impeller skeleton 10 can be a right prism with regular polygonal bottom surfaces. The upper and lower bottom surfaces of the impeller skeleton 10 can be squares, regular hexagons and regular octagons. The regular octagon is preferably used here. Compared with the square and regular hexagon, the regular octagon can reduce the assembly error of the impeller body 20 when it is mounted on the impeller skeleton 10; compared with the cylinder, the regular octagonal prism can make the impeller skeleton 10 rotated by the pump shaft. Each side of the impeller skeleton 10 is limited by the inner wall of the polygonal annular cavity 30, so that the impeller skeleton 10 transmits the torque to the impeller body; the shape of the polygonal annular cavity 30 is consistent with the shape of the impeller skeleton 10. Matching, here preferably an octagonal annular cavity; after the impeller body is sleeved onto the impeller skeleton 10, the polygonal annular cavity 30 between the impeller body and the impeller skeleton 10 is filled by the adhesive layer 40, so that the impeller body and the impeller skeleton 10 are bonded and fixed, which can ensure to a greater extent that the impeller skeleton 10 can transmit a stronger torque to the impeller body 20; filling the polygonal annular cavity 30 between the impeller skeleton 10 and the impeller body by the adhesive layer 40 can allow errors in the dimensions of the impeller skeleton 10 and the impeller body during the parts manufacturing process, without the need to precisely control the dimensions of the impeller skeleton 10 and the impeller body 20, thereby reducing the scrap rate of parts and saving costs.

[0026] See also Figure 2 The gap width of the polygonal annular cavity 30 can be 0.1 to 0.2 times the radius of the centrifugal pump shaft 60. When the gap width of the polygonal annular cavity 30 is too large, the impeller skeleton 10 rotates under the drive of the centrifugal pump shaft 60, and the side wall of the impeller skeleton 10 cannot abut against the inner wall of the polygonal annular cavity 30. The torque obtained by the impeller body 20 can only come from the bonding force of the bonding layer 40. Rotational dislocation is likely to occur between the impeller body 20 and the impeller skeleton 10, thereby damaging the ceramic impeller structure. When the gap width of the polygonal annular cavity 30 is too small, the bonding layer 40 0 is not easy to fill into the polygonal annular cavity 30, and vacuum space is likely to exist in the polygonal annular cavity 30. When the centrifugal pump shaft 60 drives the impeller skeleton 10 to rotate, the impeller skeleton 10 and the impeller body 20 are likely to shake, causing damage to parts. Therefore, the gap width of the polygonal annular cavity 30 can be 0.1~0.2 times the radius of the centrifugal pump shaft 60, which can enable the bonding layer 40 to enter the polygonal annular cavity 30 for bonding, and can ensure that the side wall of the impeller skeleton 10 abuts the inner wall of the polygonal annular cavity 30, thereby ensuring the torque transmission of the impeller skeleton 10.

[0027] The beneficial effects of the sintered ceramic impeller structure provided by the present invention are as follows: compared with the prior art, the present invention adopts an impeller body 20 provided with a polyhedron annular cavity, which is sleeved on the impeller skeleton 10. The side wall of the impeller skeleton 10 inserted into the polyhedron annular cavity is limited by the inner wall of the polyhedron annular cavity, which can increase the connection strength between the impeller skeleton 10 and the impeller body 20, ensuring that the impeller skeleton 10 transmits the torque of the pump shaft to the impeller body 20; the impeller body 20 and the impeller skeleton 10 are bonded by the bonding layer 40, so that the main force for the impeller skeleton 10 to transmit the torque can also come from the bonding force of the bonding layer 40, ensuring the torque transmission of the impeller skeleton 10 and enhancing the structural reliability of the ceramic impeller; the impeller skeleton 10 can allow a small error in its own size. When the impeller body 20 is sleeved on the impeller skeleton 10, there is a gap between the impeller skeleton 10 and the impeller body 20 and it is filled by the bonding layer 40. There is no need to perform precision grinding on the parts, which reduces the production cost and saves costs.

[0028] In one possible implementation, see Figure 3 The impeller skeleton 10 extends in all directions from one side of the centrifugal pump shaft 60 to form a limiting step 11 , and the limiting step 11 is in axial contact with the impeller body 20 .

[0029] It should be noted that the impeller skeleton 10 extends in all directions on the side away from the centrifugal pump shaft 60 to form a limiting step 11, which can enable the impeller skeleton 10 to form a T-shaped structure, and can increase the surface area of ​​the impeller skeleton 10 on the side away from the centrifugal pump shaft 60, thereby bearing the axial force generated by the impeller body 20 to a higher degree.

[0030] In one possible implementation, see Figure 1 and Figure 4 A groove 31 is provided around the edge of the polygonal annular cavity 30 on one side away from the centrifugal pump shaft 60 , and the inner wall of the groove 31 abuts against the step surface of the limiting step 11 .

[0031] It should be noted that after the impeller body 20 is sleeved on the impeller skeleton 10, the limiting step 11 can be embedded in the slot 31, and the inner wall of the slot 31 and the step surface of the limiting step 11 abut against each other, which can limit the impeller body 20 and prevent the impeller body 20 from sliding out of the impeller skeleton 10. It can also increase the power transmission capacity and anti-axial capacity of the impeller skeleton 10, and avoid the impeller body 20 and the impeller skeleton 10 from separating and falling off due to insufficient bonding force of the bonding layer 40, making it safer and more reliable to use.

[0032] In one possible implementation, see Figure 4 and Figure 5The impeller body 20 includes a front cover plate 21 and a rear cover plate 22 that are spaced apart, and a plurality of main blades 23 connected between the front cover plate 21 and the rear cover plate 22; the front cover plate 21 is mounted on the pump shaft 60 of the centrifugal pump, and the main blades 23 are spaced apart along the circumference of the polygonal annular cavity 30, and a liquid flow channel 24 is formed between adjacent main blades 23.

[0033] It should be noted that the impeller body 20 can be a closed impeller, having a front cover plate 21, a rear cover plate 22 and a plurality of main blades 23 arranged at intervals. The main blades 23 have a front cover plate 21 and a rear cover plate 22 on both sides, which can form a closed liquid flow channel, reduce leakage and friction of the liquid during the flow process, and thus improve hydraulic efficiency; as a closed impeller, the impeller body structure is complete, not easily subject to wear, and has a long service life; even in the presence of tiny impurities, the impeller body 20 can maintain good performance, reducing the need for frequent replacement due to wear.

[0034] In one possible implementation, see Figure 4 and Figure 5 A volume cavity 25 is formed between the front cover plate 21, the rear cover plate 22 and the main blade 23. A liquid inlet 26 communicating with the volume cavity 25 is provided on the rear cover plate 22. The edges of the liquid inlet 26 are arc-shaped annular surfaces.

[0035] It should be noted that the material enters the volume chamber 25 from the liquid inlet 26, is acted upon by the centrifugal force provided by the pump shaft 60 of the centrifugal pump, and is thrown out from the liquid flow channel 24; the edges surrounding the liquid inlet 26 are arc-shaped annular surfaces, which can increase the liquid flow rate of the liquid inlet 26 and improve the volumetric efficiency.

[0036] In one possible implementation, see Figure 5 A plurality of guide plates 221 are provided at intervals on one side of the rear cover plate 22 away from the front cover plate 21 .

[0037] It should be noted that a plurality of guide plates 221 are arranged at intervals on the side of the rear cover plate 22 away from the front cover plate 21. The guide plates 221 can rectify the liquid flow. The guide plates 221 can generate a certain pressure to offset the pressure difference between the liquid flow channel 24 and the liquid inlet 26, reduce the high-pressure fluid flowing into the liquid inlet 26, increase the sealing effect of the device, and improve the volumetric efficiency.

[0038] In one possible implementation, see Figure 5 A plurality of auxiliary blades 211 are spaced apart on one side of the front cover plate 21 close to the rear cover plate 22 , and each auxiliary blade 211 is located between adjacent main blades 23 .

[0039] It should be noted that the auxiliary blades 211 spaced apart from the main blades 23 can change the flow state of the fluid at the impeller outlet to a greater extent, make the flow velocity distribution more uniform, reduce eddies and turbulence, thereby reducing flow losses, and can improve the performance of the hydraulic model. Excellent hydraulic performance can improve the overall performance and efficiency of the impeller, thereby achieving the purpose of energy saving and consumption reduction.

[0040] In a possible implementation, the bonding layer 40 is a high molecular weight silicon carbide composite material.

[0041] It should be noted that the polymer silicon carbide composite material is a self-developed material with strong bonding ability. It can act between metals and non-metals, and can bond and fix the impeller skeleton 10 and the impeller body 20, thereby improving the bonding strength between the impeller skeleton 10 and the impeller body 20, and improving the overall structural strength and working performance of the impeller.

[0042] In one possible implementation, see Figure 1 and Figure 5 The end of the impeller skeleton 10 away from the centrifugal pump shaft 60 is a convex surface.

[0043] It should be noted that the lower surface of the impeller skeleton 10 is set to a convex surface, which can reduce the local impact of the liquid flow on the lower surface of the impeller skeleton 10 when the liquid flow enters the liquid inlet 26 and impacts the lower surface of the impeller skeleton 10. The lower surface of the convex surface can disperse the liquid flow to the surroundings, slow down the impact of the liquid flow, and improve the bearing capacity of the impeller skeleton 10.

[0044] In one possible implementation, see Figure 1 Both ends of the impeller skeleton 10 are provided with wear-resistant coatings.

[0045] It should be noted that the wear-resistant layer 50 is a wear-resistant and corrosion-resistant ceramic material. The wear-resistant layer 50 is used to seal the installation gap between the upper and lower surfaces of the impeller skeleton 10 and the impeller body 20, and the wear-resistant layer 50 is used to coat the lower surface of the impeller skeleton 10, which can further improve the impeller body 20's ability to withstand the axial force pointing in the direction of the liquid inlet 26.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Sintered ceramic impeller structure, characterized in that, include: The impeller frame is used to be mounted on the pump shaft of the centrifugal pump; An impeller body is sleeved on the impeller frame and forms a polygonal annular cavity with the impeller frame; The bonding layer is filled in the polygonal annular cavity and is bonded and fixed together with the impeller skeleton and the impeller body.

2. The sintered ceramic impeller structure according to claim 1, characterized in that: The impeller skeleton extends in all directions from one side of the centrifugal pump shaft to form a limiting step, and the limiting step is in axial contact with the impeller body.

3. The sintered ceramic impeller structure according to claim 2, characterized in that: A clamping groove is provided on the four edges of the polygonal annular cavity on one side away from the pump shaft of the centrifugal pump, and the inner wall of the clamping groove abuts against the step surface of the limiting step.

4. The sintered ceramic impeller structure according to claim 1, characterized in that: The impeller body includes a front cover plate and a rear cover plate that are spaced apart, and a plurality of main blades connected between the front cover plate and the rear cover plate; the front cover plate is sleeved on the pump shaft of the centrifugal pump, and the main blades are spaced apart along the circumference of the polygonal annular cavity, and liquid flow channels are formed between adjacent main blades.

5. The sintered ceramic impeller structure according to claim 4, characterized in that: A volume cavity is formed between the front cover plate, the rear cover plate and the main blades. A liquid inlet communicating with the volume cavity is provided on the rear cover plate. The edges around the liquid inlet are arc-shaped annular surfaces.

6. The sintered ceramic impeller structure according to claim 4, characterized in that: A plurality of guide plates are provided at intervals on one side of the rear cover plate away from the front cover plate.

7. The sintered ceramic impeller structure according to claim 4, characterized in that: A plurality of auxiliary blades are spaced apart on one side of the front cover plate close to the rear cover plate, and each of the auxiliary blades is located between adjacent main blades.

8. The sintered ceramic impeller structure according to claim 1, wherein: The bonding layer is a high molecular silicon carbide composite material.

9. The sintered ceramic impeller structure according to claim 1, wherein: One end of the impeller skeleton away from the pump shaft of the centrifugal pump is a convex surface.

10. The sintered ceramic impeller structure according to any one of claims 1 to 9, characterized in that: Both ends of the impeller skeleton are provided with wear-resistant coatings.

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