A boiler system and a pump device thereof

Abstract

The present invention discloses a centrifugal pump for a boiler system, wherein the rotor comprises a front disc (1), a rear disc (2), blades (3), a first inclined surface (4), and a second inclined surface (5), wherein the inner side of the front disc has a first inclined surface, the inner side of the rear disc has a second inclined surface, and a gradually expanding diffusion structure is formed between the first inclined surface and the second inclined surface, and the blades are characterized in that the blades comprise a first blade (31) and a second blade (32) connected in sequence, the first blade is located radially inside the second blade, the first blade and the second blade are arc-shaped blades, the pressure surface of the first blade has a plurality of guide grooves (33), and the pressure surface of the second blade has a wave structure (34). The present invention can effectively improve the anti-cavitation performance of the rotor / impeller and reduce the flow resistance of the wall layer on the blade surface, thereby improving the overall performance of the pump and improving the supply and operation stability of the boiler system.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler systems, and mainly to a boiler system and a pump device thereof, and specifically to a centrifugal pump used in a boiler system. Background Art

[0002] like Figure 1 As shown, the boiler feed water and sewage subsystem of the boiler system includes a variety of pump devices, such as feed water pumps, deaerator water pumps, sewage pumps, steam pumps, etc., and the pump devices are mainly centrifugal pumps.

[0003] like Figure 2 As shown, the rotor of the existing centrifugal pump includes a front disc 1, a rear disc 2, blades 3, a first inclined surface 4, and a second inclined surface 5. A plurality of blades 3 are evenly distributed along the circumference and connected between the front disc 1 and the rear disc 2. The inner side of the front disc 1 has a first inclined surface 4, and the inner side of the rear disc 2 has a second inclined surface 5. The first inclined surface 4 and the second inclined surface 5 are arranged opposite to each other and have the same inner diameter and outer diameter. Along the flow direction, a gradually expanding diffusion structure is formed between the first inclined surface 4 and the second inclined surface 5. However, the existing impeller structure has the problems of poor anti-cavitation effect and large flow resistance of the wall layer on the blade surface. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a boiler system and a pump device thereof, which can effectively improve the anti-cavitation performance of the rotor / impeller and reduce the flow resistance of the wall layer on the blade surface by providing a plurality of guide grooves on the pressure surface of the first blade of the centrifugal pump, and a wave structure on the pressure surface of the second blade, wherein the plurality of guide grooves extend along the radial direction of the first blade, and the wave structure extends along the radial direction of the second blade, thereby improving the overall performance of the pump and improving the supply and operation stability of the boiler system.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A centrifugal pump for a boiler system, wherein the rotor comprises a front disc (1), a rear disc (2), blades (3), a first inclined surface (4), and a second inclined surface (5), wherein a plurality of blades are evenly distributed along the circumferential direction and connected between the front disc and the rear disc, wherein the inner side of the front disc has a first inclined surface, and the inner side of the rear disc has a second inclined surface, wherein the first inclined surface and the second inclined surface are arranged opposite to each other and have the same inner diameter and outer diameter, and wherein a gradually expanding diffusion structure is formed between the first inclined surface and the second inclined surface along the flow direction, wherein the blades (3) comprise a first blade (31) and a second blade (32) connected in sequence, wherein the first blade is located radially inside the second blade, the first blade and the second blade are arc-shaped blades, the pressure surface of the first blade has a plurality of guide grooves (33), and the pressure surface of the second blade has a wave structure (34).

[0007] Furthermore, the plurality of guide grooves (33) extend radially of the first blade (31) and extend from the radial inner end to the radial outer end of the first blade; the wave structure (34) extends radially of the second blade (32) and extends from the radial inner end to the radial outer end of the second blade, and the wave crests and wave troughs of the wave structure are arranged opposite to each other in the circumferential direction.

[0008] Furthermore, the outer diameter of the first blade (31) is substantially equal to the inner diameter of the first inclined surface (4) or the second inclined surface (5), and the inner diameter of the second blade (32) is substantially equal to the inner diameter of the first inclined surface or the second inclined surface.

[0009] Furthermore, the first blade (31) has a first thickness H1, the second blade (32) has a second thickness H2, and H1>H2.

[0010] Furthermore, the first blade (31) has a first curvature S1, the second blade (32) has a second curvature S2, and S2>S1.

[0011] Furthermore, the first blade (31) has a first radial length L1, the second blade (32) has a second radial length L2, and L2>L1.

[0012] Furthermore, the rotor is an impeller of a centrifugal pump.

[0013] A boiler system comprises the centrifugal pump for the boiler system, wherein the centrifugal pump is a feed water pump, a deoxygenation water pump, a sewage pump or a steam pump.

[0014] A centrifugal pump for a boiler system of the present invention can effectively improve the anti-cavitation performance of the rotor / impeller and reduce the flow resistance of the wall layer on the surface of the blade, thereby improving the overall performance of the pump and improving the supply and operation stability of the boiler system.

[0015] A boiler system and a pump device thereof of the present invention can further improve the anti-cavitation performance of the rotor / impeller and further reduce the flow resistance of the wall layer on the surface of the blades through the design of the thickness H and curvature S of the first blade and the second blade of the centrifugal pump, thereby improving the overall performance of the pump and improving the supply and operation stability of the boiler system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a boiler system in the prior art;

[0017] Figure 2 It is a schematic diagram of the rotor front view structure of a prior art pump device;

[0018] Figure 3 A schematic diagram of the rotor structure of the pump device of the present invention from top view;

[0019] Figure 4 It is a schematic diagram of the partially enlarged structure of the rotor of the pump device of the present invention.

[0020] In the figure: a front disc 1 , a rear disc 2 , blades 3 , a first inclined surface 4 , a second inclined surface 5 , a first blade 31 , a second blade 32 , a guide groove 33 , and a wave structure 34 . DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] like Figure 2-4 As shown, a centrifugal pump for a boiler system, the rotor of which includes a front disk 1, a rear disk 2, blades 3, a first inclined surface 4, and a second inclined surface 5. A plurality of blades 3 are evenly distributed along the circumferential direction and connected between the front disk 1 and the rear disk 2. The inner side of the front disk 1 has a first inclined surface 4, and the inner side of the rear disk 2 has a second inclined surface 5. The first inclined surface 4 and the second inclined surface 5 are arranged opposite to each other and have the same inner diameter and outer diameter. Along the flow direction, a gradually expanding diffusion structure is formed between the first inclined surface 4 and the second inclined surface 5. It is characterized in that: the blade 3 includes a first blade 31 and a second blade 32 connected in sequence, the first blade 31 is located radially inside the second blade 32, the first blade 31 and the second blade 32 are arc-shaped blades, the pressure surface of the first blade 31 has a plurality of guide grooves 33, and the pressure surface of the second blade 32 has a wave structure 34.

[0024] A plurality of guide grooves 33 extend radially along the first blade 31 and extend from the radial inner end to the radial outer end of the first blade 31; a wave structure 34 extends radially along the second blade 32 and extends from the radial inner end to the radial outer end of the second blade 32, and the crests and troughs of the wave structure 34 are arranged opposite to each other along the circumferential direction.

[0025] A centrifugal pump for a boiler system of the present invention has a plurality of guide grooves 33 on the pressure surface of a first blade 31, a wave structure 34 on the pressure surface of a second blade 32, the plurality of guide grooves 33 extend along the radial direction of the first blade 31, and the wave structure 34 extends along the radial direction of the second blade 32. This can effectively improve the anti-cavitation performance of the rotor / impeller and reduce the flow resistance of the wall layer on the blade surface, thereby improving the overall performance of the pump and improving the supply and operation stability of the boiler system.

[0026] Furthermore, the outer diameter of the first blade 31 is substantially equal to (substantially equal to: within an error range of ±5-10%) the inner diameter of the first inclined surface 4 or the second inclined surface 5 , and the inner diameter of the second blade 32 is substantially equal to the inner diameter of the first inclined surface 4 or the second inclined surface 5 .

[0027] Further, the first blade 31 has a first thickness H1 , the second blade 32 has a second thickness H2 , and H1 > H2 .

[0028] Further, the first blade 31 has a first curvature S1 , the second blade 32 has a second curvature S2 , and S2 > S1 .

[0029] Further, the first blade 31 has a first radial length L1, the second blade 32 has a second radial length L2, and L2>L1.

[0030] A centrifugal pump for a boiler system of the present invention can further improve the anti-cavitation performance of the rotor / impeller and further reduce the flow resistance of the wall layer on the blade surface through the design of the thickness H and curvature S of the first blade 31 and the second blade 32, thereby improving the overall performance of the pump and improving the supply and operation stability of the boiler system.

[0031] The rotor is an impeller of a centrifugal pump, and the impeller is installed in the volute of the centrifugal pump.

[0032] A boiler system comprises the centrifugal pump for the boiler system, wherein the centrifugal pump is a feed water pump, a deoxygenation water pump, a sewage pump or a steam pump.

[0033] A boiler system and a pump device thereof of the present invention can effectively improve the anti-cavitation performance of the rotor / impeller and reduce the flow resistance of the wall layer on the blade surface by providing a plurality of guide grooves on the pressure surface of the first blade and a wave structure on the pressure surface of the second blade, wherein the plurality of guide grooves extend along the radial direction of the first blade and the wave structure extends along the radial direction of the second blade, thereby improving the overall performance of the pump and improving the supply and operation stability of the boiler system.

[0034] The above-mentioned implementation modes are for explanation of the present invention rather than limitation of the present invention. It can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A centrifugal pump for a boiler system, wherein the rotor comprises a front disc (1), a rear disc (2), blades (3), a first inclined surface (4), and a second inclined surface (5), wherein a plurality of blades are evenly distributed along the circumferential direction and connected between the front disc and the rear disc, wherein the inner side of the front disc has a first inclined surface, and the inner side of the rear disc has a second inclined surface, wherein the first inclined surface and the second inclined surface are arranged opposite to each other and have the same inner diameter and outer diameter, and wherein a gradually expanding diffusion structure is formed between the first inclined surface and the second inclined surface along the flow direction, wherein: The blade (3) comprises a first blade (31) and a second blade (32) which are connected in sequence, the first blade is located radially inside the second blade, the first blade and the second blade are arc-shaped blades, the pressure surface of the first blade has a plurality of guide grooves (33), and the pressure surface of the second blade has a wave structure (34); the plurality of guide grooves (33) extend radially along the first blade (31) and extend from the radial inner end to the radial outer end of the first blade; the wave structure (34) extends radially along the second blade (32) and extends from the radial inner end to the radial outer end of the second blade, and the wave crests and wave troughs of the wave structure are arranged opposite to each other along the circumferential direction.

2. A centrifugal pump for a boiler system according to claim 1, characterized in that: The outer diameter of the first blade (31) is substantially equal to the inner diameter of the first inclined surface (4) or the second inclined surface (5), and the inner diameter of the second blade (32) is substantially equal to the inner diameter of the first inclined surface or the second inclined surface.

3. A centrifugal pump for a boiler system as claimed in claim 2, characterized in that: The first blade (31) has a first thickness H1, the second blade (32) has a second thickness H2, and H1>H2.

4. A centrifugal pump for a boiler system as claimed in claim 3, characterized in that: The first blade (31) has a first curvature S1, the second blade (32) has a second curvature S2, and S2>S1.

5. A centrifugal pump for a boiler system as claimed in claim 4, characterized in that: The first blade (31) has a first radial length L1, the second blade (32) has a second radial length L2, and L2>L1.

6. A centrifugal pump for a boiler system as claimed in claim 1 or 4, characterized in that: The rotor is an impeller of a centrifugal pump.

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