Fire pump impeller structure and fire pump equipment

Abstract

The fire pump impeller structure comprises a rear cover plate, long blades and short blades, a hub is arranged in the middle of the rear cover plate, the long blades and the short blades are arranged on the rear cover plate in a staggered mode, one ends of the long blades are attached to the peripheral side of the hub, and the other ends of the long blades are attached to the peripheral side of the hub. The other ends of the long blades extend to the edge of the rear cover plate, one ends of the short blades are far away from the hub and located between every two adjacent long blades, the distance between one ends of the short blades and the central axis of the hub is a preset distance, and the other ends of the short blades extend to the edge of the rear cover plate. And the preset distance is 0.17-0.35 time of the outer diameter of the impeller. The long blades and the short blades are arranged on the rear cover plate in a staggered mode, the preset distance is formed between one end of each short blade and the central axis of the hub, and the preset distance is 0.17-0.35 time of the outer diameter of the impeller, so that the center eddy current loss of the impeller structure is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fire pumps, in particular to a fire pump impeller structure and fire pump equipment. Background Art

[0002] At present, most of the traditional fire pump impellers on the market adopt the traditional equal-size blade structure, such as Figure 1 As shown, although this design is simple in structure, it has some shortcomings in practical applications. For example, the traditional impeller is relatively congested due to the small area at the inlet of the impeller, which easily leads to blockage between the blades when conveying water containing impurities.

[0003] Therefore, it is urgent to propose a fire pump impeller structure to solve the problem raised. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a fire pump impeller structure and fire pump equipment that are not prone to clogging.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a fire pump impeller structure, which includes a rear cover plate, long blades and short blades, a hub is arranged in the middle of the rear cover plate, the long blades and the short blades are staggered on the rear cover plate, one end of the long blade is arranged in contact with the circumference of the hub, the other end of the long blade extends to the edge of the rear cover plate, one end of the short blade is arranged away from the hub and is between two adjacent long blades, and one end of the short blade is a preset distance from the central axis of the hub, and the other end of the short blade extends to the edge of the rear cover plate, and the preset distance is 0.17 to 0.35 times the outer diameter of the impeller.

[0006] In one embodiment, both the long blades and the short blades are twisted blade structures, and the thicknesses of the long blades and the short blades increase sequentially from near to far from the hub.

[0007] In one embodiment, the inlet edge thickness of the short blade is 1-3 mm, the inlet edge thickness of the long blade is 2-4 mm, and the maximum thickness of the short blade is 0.7-1.0 times the maximum thickness of the long blade.

[0008] In one embodiment, the inlet edge of the short blade is arc-shaped or sharp-shaped.

[0009] In one embodiment, the radial length of the short blade is 0.15 to 0.3 times the outer diameter of the impeller.

[0010] In one of the embodiments, a plurality of balancing holes are provided on the rear cover plate near the circumference of the hub, and the balancing holes are arranged to match the long blades.

[0011] In one of the embodiments, a back blade is provided on a side of the rear cover away from the long blade, and a bending direction of the back blade is consistent with a bending direction of the long blade.

[0012] In one of the embodiments, the inlet edge of the long blade is inclined relative to the rear cover plate.

[0013] In one of the embodiments, the inlet edge of the long blade has an inclination angle ranging from 15° to 45° relative to the rear cover plate.

[0014] A fire pump device comprises a rear cover plate, long blades and short blades of the above-mentioned fire pump impeller structure.

[0015] In summary, the utility model provides a fire pump impeller structure and fire pump equipment, by staggeredly arranging long blades and short blades on the rear cover plate, with one end of the short blade being at a preset distance from the central axis of the hub, which is 0.17 to 0.35 times the outer diameter of the impeller, so as to reduce the eddy current loss in the center of the impeller structure and facilitate the passage of solid particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an existing fire pump impeller structure;

[0017] Figure 2 This is a schematic diagram of the structure of a fire pump impeller structure after the front cover plate is hidden in the utility model;

[0018] Figure 3 This is a structural side view of a fire pump impeller structure with a hidden front cover plate according to the utility model;

[0019] Figure 4 The utility model is a structural schematic diagram of a fire pump impeller structure. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figures 2 to 3 The utility model discloses a fire pump impeller structure including a rear cover plate 10, a large blade 20 and a small blade 30. A hub 40 is arranged in the middle of the rear cover plate 10. A keyway 41 is provided on the inner side of the hub 40 for connection with an external shaft. The large blade 20 and the small blade 30 are staggered on the rear cover plate 10. One end of the large blade 20 is arranged close to the circumference of the hub 40, and the other end of the large blade 20 extends to the edge of the rear cover plate 10. One end of the small blade 30 is arranged away from the hub 40 and is between the two adjacent blades. 20, and one end of the small blade 30 is a preset distance from the central axis of the hub 40, and the other end of the small blade 30 extends to the edge of the rear cover 10, and the preset distance is 0.17 to 0.35 times the outer diameter of the impeller, preferably 0.25 times, to reduce the eddy loss in the center of the impeller structure and facilitate the passage of solid particles, thereby enhancing the comprehensive performance of the fire pump; wherein the outer diameter of the impeller is consistent with the diameter of the rear cover 10. In this embodiment, the number of large blades 20 and small blades 30 is at least three.

[0024] In one embodiment, both the large blades 20 and the small blades 30 are twisted blade structures, and the thickness of the large blades 20 and the small blades 30 increases successively from near to far from the hub 40, wherein the inlet edge thickness of the small blade 30, i.e., the thickness tjx of the small blade 30 closest to the hub 40, is 1 to 3 mm, and the inlet edge thickness of the large blade 20, i.e., the thickness tj of the large blade 20 close to the hub 40, is 2 to 4 mm, and the maximum thickness tx of the small blade 30 is 0.7 to 1.0 times the maximum thickness t of the large blade 20. While ensuring the blade strength, it also increases the flow area of ​​the impeller structure, improves the cavitation resistance of the impeller, and effectively reduces hydraulic losses.

[0025] like Figure 3 As shown, in one embodiment, the radial length of the small blade 30 is 0.15 to 0.3 times the outer diameter of the impeller to ensure the optimization of the internal flow field of the impeller structure, thereby improving the head, suction and durability of the pump; wherein, the radial length Lr of the small blade refers to the distance between the innermost position point of the small blade 30 after being projected on the rear cover plate 10 and the circle corresponding to the impeller edge, and the innermost position point is also the position point of the small blade 30 closest to the hub 40 after being projected on the rear cover plate 10.

[0026] In one embodiment, the inlet edge of the blade 30 is arc-shaped or sharp-shaped, and the thickness of the inlet edge of the blade 30 is 1 mm to 3 mm, so as to improve the flow state of the fluid when passing through the central area of ​​the impeller structure and reduce energy loss.

[0027] In one embodiment, a plurality of balancing holes 11 are provided on the rear cover plate 10 near the circumference of the hub 40, and the balancing holes 11 are arranged to match the large blades 20; in this embodiment, the number of the balancing holes 11 is designed to be 3 to 6, and the aperture of the balancing holes 11 is 4 to 8 mm, so as to balance the axial force and radial force generated when the impeller structure rotates, reduce vibration, and ensure smooth operation.

[0028] In one embodiment, a back blade 12 is provided on the side of the rear cover plate 10 away from the large blade 20. The bending direction of the back blade 12 is consistent with the bending direction of the large blade 20. The number of the back blade 12 is designed to be 4 to 6 to balance the axial force and radial force generated when the impeller structure rotates, reduce vibration, and ensure smooth operation.

[0029] In this embodiment, the design structures of the balancing hole 11 and the back blade 12 can be used separately or in combination, and can balance the axial force and radial force generated when the impeller structure rotates, reduce vibration, and ensure smooth operation.

[0030] In one embodiment, the inlet edge of the large blade 20 is tilted relative to the rear cover plate 10, and the inlet edge of the large blade 20 relative to the rear cover plate 10 has an inclination angle α ranging from 15° to 45° to optimize the centrifugal acceleration effect of the water flow in the impeller structure.

[0031] In one embodiment, the fire pump impeller structure of the utility model further includes a front cover plate 50 , which is connected to the rear cover plate 10 , and the large blades 20 and the small blades 30 are both placed in the space between the front cover plate 50 and the rear cover plate 10 .

[0032] In one embodiment, in order to improve the stability of the impeller structure in the application of the fire pump field, the corresponding components of the impeller structure such as the rear cover plate 10, the large blades 20 and the small blades 30 are all made of wear-resistant and corrosion-resistant material structures; further, the surfaces of the rear cover plate 10, the large blades 20 and the small blades 30 are coated with a drag-reducing coating to further reduce the flow resistance and improve the pumping efficiency of the fire pump.

[0033] Compared with the prior art, the fire pump impeller structure of the utility model has the following beneficial effects:

[0034] 1. By arranging blade structures of different lengths on the impeller structure, the water flow can be guided more effectively, the eddy loss in the center of the impeller can be reduced, and the solid particles can pass through more easily; the large blades 20 can capture more fluid and convert it into greater thrust, while the small blades 30 can reduce the eddy loss in the high flow rate area, thereby ensuring efficient energy conversion while improving the overall working efficiency and flow adjustment range of the pump;

[0035] 2. The layout of large and small blades promotes the optimization of the flow field in the pump, especially in the starting stage, which can effectively form a stronger vacuum, accelerate the self-priming process, ensure that the fire pump can quickly reach the rated working state in an emergency, and shorten the response time, which is very important for emergency applications such as fire rescue;

[0036] 3. The fluid dynamic balance of the impeller during operation is optimized through the ratio and distribution of the lengths of large and small blades, which significantly reduces unnecessary vibration and fluid turbulence noise during operation, provides operators with a safer and more comfortable working environment, and also extends the service life of the pump and its related components; in addition, it can effectively disperse the impact force of the water flow under high-speed rotation and reduce the wear of key parts, especially the layout of the small blades 30 in the high-stress area, which effectively alleviates the problem of local wear, and significantly improves the overall durability and maintenance cycle of the impeller structure.

[0037] like Figures 2 to 3 As shown, the utility model also discloses a fire pump device, including a rear cover plate 10, a large blade 20 and a small blade 30 of the above-mentioned fire pump impeller structure.

[0038] In summary, the utility model provides a fire pump impeller structure and fire pump equipment by staggeredly arranging large blades 20 and small blades 30 on the rear cover plate 10, with one end of the small blade 30 being at a preset distance from the central axis of the hub 40, and the preset distance being 0.17 to 0.35 times the outer diameter of the impeller, so as to reduce the eddy current loss in the center of the impeller structure and facilitate the passage of solid particles.

[0039] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A fire pump impeller structure, characterized in that: It includes a rear cover plate, long blades and short blades, a hub is arranged in the middle of the rear cover plate, the long blades and the short blades are staggered on the rear cover plate, one end of the long blade is arranged in contact with the circumference of the hub, the other end of the long blade extends to the edge of the rear cover plate, one end of the short blade is arranged away from the hub and is between two adjacent long blades, and one end of the short blade is a preset distance from the central axis of the hub, and the other end of the short blade extends to the edge of the rear cover plate, and the preset distance is 0.17 to 0.35 times the outer diameter of the impeller.

2. A fire pump impeller structure according to claim 1, characterized in that: The long blades and the short blades are both twisted blade structures, and the thicknesses of the long blades and the short blades increase successively from near to far from the hub.

3. A fire pump impeller structure according to claim 2, characterized in that: The inlet edge thickness of the short blade is 1 to 3 mm, the inlet edge thickness of the long blade is 2 to 4 mm, and the maximum thickness of the short blade is 0.7 to 1.0 times the maximum thickness of the long blade.

4. A fire pump impeller structure according to claim 3, characterized in that: The inlet edge of the short blade is in an arc shape or a sharp shape.

5. A fire pump impeller structure according to claim 1 or 2, characterized in that: The radial length of the short blade is 0.15 to 0.3 times the outer diameter of the impeller.

6. A fire pump impeller structure according to claim 1 or 2, characterized in that: The rear cover plate is provided with a plurality of balancing holes close to the circumference of the hub, and the balancing holes are arranged to match the long blades.

7. A fire pump impeller structure according to claim 1 or 2, characterized in that: A back blade is arranged on one side of the rear cover away from the long blade, and a bending direction of the back blade is consistent with a bending direction of the long blade.

8. A fire pump impeller structure according to claim 1 or 2, characterized in that: The inlet edge of the long blade is arranged obliquely relative to the rear cover plate.

9. A fire pump impeller structure according to claim 8, characterized in that: The inclination angle of the inlet edge of the long blade relative to the rear cover plate ranges from 15° to 45°.

10. A fire pump device, characterized in that: The invention comprises a rear cover plate, long blades and short blades of the fire pump impeller structure as claimed in any one of claims 1 to 9.

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