A fire pump with improved flow passage

Abstract

The present invention discloses a fire pump with an improved flow channel, which includes a volute, an impeller, and a motor. The impeller is rotatably mounted in the volute, the impeller includes a front cover (1), a rear cover (2), and blades (3), and a guide plate is provided between the front cover and the rear cover; the invention is characterized in that the guide plate includes a first guide plate (4), a second guide plate (5), and a third guide plate (6), the chord of the arc-shaped plate structure of the first guide plate has an angle +a with a reference plane, the second flat plate structure of the second guide plate has an angle +b with the reference plane, and the third flat plate structure of the third guide plate has an angle ‑c with the reference plane, the reference plane is perpendicular to the rotation axis of the impeller, the angle a≠b≠c, and a>b>c. The present invention can reduce flow loss in the impeller flow channel through the design of the impeller flow channel, improve the anti-cavitation performance of the fire pump, and thus improve the hydraulic performance and efficiency of the fire pump.

Description

Technical Field

[0001] The present invention relates to the technical field of fire pumps, and in particular to a fire pump with an improved flow passage. Background Art

[0002] like Figure 1 As shown, an existing fire pump includes a volute, an impeller, a motor, and a sealing device. The impeller is rotatably mounted within the volute, and its central hub is connected to the motor via a drive shaft. The impeller includes a front cover, a rear cover, and blades. Multiple blades are circumferentially distributed and connected between the front and rear covers. A guide plate is provided between the front and rear covers, and the guide plate is connected to the multiple blades. However, existing fire pumps still suffer from significant flow losses within the flow channel, low cavitation resistance, and the hydraulic performance needs to be further improved. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a fire pump with an improved flow channel. Through the design of the impeller flow channel, the flow loss in the impeller flow channel can be reduced, the output flow velocity and flow rate of the impeller flow channel can be increased, and the anti-cavitation performance of the fire pump can be improved, thereby improving the hydraulic performance and efficiency of the fire pump.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A fire pump with an improved flow passage comprises a volute, an impeller, a motor, and a sealing device. The impeller is rotatably mounted in the volute, the central hub of the impeller is connected to the motor via a transmission shaft, the impeller comprises a front cover (1), a rear cover (2), and blades (3), a plurality of blades are distributed along the circumferential direction and connected between the front cover and the rear cover, a guide plate is provided between the front cover and the rear cover, and the guide plate is connected to the plurality of blades; the characteristic is that the guide plates (4, 5, 6) comprise a first guide plate (4), a second guide plate (5), and a third guide plate (6), the first guide plate, the second guide plate (5), and the third guide plate (6). The second guide plate and the third guide plate are arranged radially in sequence, and each guide plate is annular as a whole. The cross section of the first guide plate is an arc-shaped plate structure, the cross section of the second guide plate is a second flat plate structure, and the cross section of the third guide plate is a third flat plate structure. There is an angle +a between the chord line of the arc-shaped plate structure and the reference plane, an angle +b between the second flat plate structure and the reference plane, and an angle -c between the third flat plate structure and the reference plane. The reference plane is perpendicular to the rotation axis of the impeller, the angle a≠b≠c, and a>b>c, and "+" and "-" indicate the direction of the angle.

[0006] Furthermore, the angle a=(1.01-1.2)b, c=(0.3-0.5)b.

[0007] Furthermore, the downstream end of the first guide plate (4) is provided with a first inclined surface (41), the upstream end of the second guide plate (5) is provided with a second inclined surface (53), the downstream end of the second guide plate is provided with a third inclined surface (54), and the downstream end of the third guide plate (6) is provided with a fourth inclined surface (61).

[0008] Furthermore, an included angle d is formed between the first inclined surface (41) and the second inclined surface (53), and an included angle e is formed between the third inclined surface (54) and the fourth inclined surface (61), where d<e.

[0009] Furthermore, the included angle d=(0.45-0.65)e, d=(0.9-1.1)b.

[0010] Furthermore, the first guide plate (4) has a radial projection length L1, the second guide plate (5) has a radial projection length L2, the third guide plate (6) has a radial projection length L3, and a radial projection length L4 is provided between the downstream end of the second guide plate and the upstream end of the third guide plate, wherein L2>L1>L3>L4.

[0011] Furthermore, the radial projection length L1 = (0.8-0.98) L2, L3 = (0.65-0.85) L2, and L4 = (0.05-0.3) L2.

[0012] Furthermore, at least a portion of the upstream portion (51) of the second guide plate (5) is configured to expand into a first wavy structure along the circumference of the impeller, and at least a portion of the downstream portion (52) of the second guide plate is configured to expand into a second wavy structure along the circumference of the impeller, the first wavy structure has an axial height G1 between its crests and troughs, and the second wavy structure has an axial height G2 between its crests and troughs, and G2>G1.

[0013] Furthermore, the axial height G2 = (1.02-2) G1.

[0014] Furthermore, the first guide plate (4) is connected to a first mounting groove on the blade (3), the second guide plate (5) is connected to a second mounting groove on the blade, and the third guide plate (6) is connected to a third mounting groove on the blade, and the shape of each mounting groove matches the shape of each guide plate.

[0015] The present invention provides a fire pump with an improved flow channel. Through the design of the impeller flow channel, specifically the angles a>b>c, a=(1.01-1.2)b, c=(0.3-0.5)b, it is possible to reduce flow losses in the impeller flow channel, increase the output flow velocity and flow rate of the impeller flow channel, and improve the anti-cavitation performance of the fire pump, thereby improving the hydraulic performance and efficiency of the fire pump.

[0016] The present invention can improve the diversion effect between the various guide plates and within the flow channel through the design of the inclined surface / guide angle, the radial projection length, and the wavy structure of the upstream and downstream parts of the second guide plate, further reduce the flow loss in the impeller flow channel, increase the output flow velocity and flow rate of the impeller flow channel, and improve the anti-cavitation performance of the fire pump, thereby further improving the hydraulic performance and efficiency of the fire pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the impeller structure of a fire pump in the prior art;

[0018] Figure 2 Schematic diagram of the impeller structure of a fire pump with an improved flow passage according to the present invention;

[0019] Figure 3 It is a partial enlarged structural schematic diagram of the impeller of the fire pump with an improved flow passage of the present invention;

[0020] Figure 4 The figure is a schematic structural diagram of the upstream and downstream parts of the fire pump with an improved flow passage according to the present invention, unfolded along the circumferential direction.

[0021] In the figure: front cover plate 1, rear cover plate 2, blades 3, first guide plate 4, second guide plate 5, third guide plate 6, first inclined surface 41, upstream portion 51, downstream portion 52, second inclined surface 53, third inclined surface 54, fourth inclined surface 61. DETAILED DESCRIPTION

[0022] To make the technical solution and its advantages of the present invention more clear, the technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. It should be noted that, for ease of description, the accompanying drawings only show the parts / structures related to the present invention. Other related parts can refer to the general design. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0023] All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention. Furthermore, unless otherwise defined, technical or scientific terms used in the description of the present invention shall have the same meanings as those generally understood by persons of ordinary skill in the art to which the present invention belongs.

[0024] The present invention will be described in further detail below with reference to the accompanying drawings.

[0025] like Figure 2-4As shown, a fire pump with an improved flow channel includes a volute, an impeller, a motor, and a sealing device. The impeller is rotatably mounted in the volute, and the central hub of the impeller is connected to the motor through a transmission shaft. The impeller includes a front cover plate 1, a rear cover plate 2, and blades 3. A plurality of blades 3 are distributed along the circumferential direction and connected between the front cover plate 1 and the rear cover plate 2. A guide plate (4, 5, 6) is provided between the front cover plate 1 and the rear cover plate 2, and the guide plate is connected to the plurality of blades 3. It is characterized in that the guide plate (4, 5, 6) includes a first guide plate 4, a second guide plate 5, and a third guide plate 6. The first guide plate 4, the second guide plate 5, and the third guide plate 6 are arranged radially in sequence, and each guide plate is annular as a whole, the cross section of the first guide plate 4 is an arc-shaped plate structure, the cross section of the second guide plate 5 is a second flat plate structure, and the cross section of the third guide plate 6 is a third flat plate structure. An angle +a is formed between the chord line of the arc-shaped plate structure and the reference plane, an angle +b is formed between the second flat plate structure and the reference plane, and an angle -c is formed between the third flat plate structure and the reference plane. The reference plane is perpendicular to the rotation axis of the impeller (in the embodiment, the reference plane is the inner flat plate surface of the rear cover 2), a≠b≠c, and a>b>c, and "+" and "-" represent the direction of the angle.

[0026] Furthermore, the angle a=(1.01-1.2)b, preferably 1.1; c=(0.3-0.5)b, preferably 0.4.

[0027] The present invention provides a fire pump with an improved flow channel. Through the design of the impeller flow channel, specifically the angles a>b>c, a=(1.01-1.2)b, c=(0.3-0.5)b, it is possible to reduce flow losses in the impeller flow channel, increase the output flow velocity and flow rate of the impeller flow channel, and improve the anti-cavitation performance of the fire pump, thereby improving the hydraulic performance and efficiency of the fire pump.

[0028] like Figure 3 As shown, the downstream end of the first guide plate 4 is provided with a first inclined surface 41, the upstream end of the second guide plate 5 is provided with a second inclined surface 53, the downstream end of the second guide plate 5 is provided with a third inclined surface 54, and the downstream end of the third guide plate 6 is provided with a fourth inclined surface 61.

[0029] An included angle d is formed between the first inclined surface 41 and the second inclined surface 53 , and an included angle e is formed between the third inclined surface 54 and the fourth inclined surface 61 , where d<e.

[0030] Furthermore, the included angle d=(0.45-0.65)e, preferably 0.55; d=(0.9-1.1)b.

[0031] The present invention can improve the diversion effect between each guide plate and within the flow channel through the design of the inclined surface / guide angle, further reduce the flow loss in the impeller flow channel, increase the output flow velocity and flow rate of the impeller flow channel, improve the anti-cavitation performance of the fire pump, and thus further improve the hydraulic performance and efficiency of the fire pump.

[0032] The first guide plate 4 has a radial projection length L1, the second guide plate 5 has a radial projection length L2, the third guide plate 6 has a radial projection length L3, and the radial projection length between the downstream end of the second guide plate 5 and the upstream end of the third guide plate 6 is L4, L2>L1>L3>L4.

[0033] Further, L1 = (0.8-0.98) L2, preferably 0.9; L3 = (0.65-0.85) L2, preferably 0.75; L4 = (0.07-0.27) L2, preferably 0.17.

[0034] The present invention can further reduce the flow loss in the impeller flow channel through the design of the radial projection length, increase the output flow velocity and flow rate of the impeller flow channel, improve the anti-cavitation performance of the fire pump, and thus further improve the hydraulic performance and efficiency of the fire pump.

[0035] like Figure 4 As shown, at least a portion of the upstream portion 51 of the second guide plate 5 is configured to expand into a first wavy structure along the circumference of the impeller, and at least a portion of the downstream portion 52 of the second guide plate 5 is configured to expand into a second wavy structure along the circumference of the impeller. The first wavy structure has an axial (impeller axis direction) height G1 between the crest and the trough, and the second wavy structure has an axial height G2 between the crest and the trough, and G2>G1.

[0036] Furthermore, the axial height G2 = (1.05-2) G1, preferably 1.5.

[0037] The present invention can reduce the flow losses in the upstream and downstream parts of the second guide plate 5 through the design of the wavy structure of the upstream and downstream parts of the second guide plate 5, further reduce the flow losses in the impeller flow channel, increase the output flow velocity and flow rate of the impeller flow channel, improve the anti-cavitation performance of the fire pump, and thus further improve the hydraulic performance and efficiency of the fire pump.

[0038] The first guide plate 4 is connected to the first mounting groove on the blade 3, the second guide plate 5 is connected to the second mounting groove on the blade 3, and the third guide plate 6 is connected to the third mounting groove on the blade 3. The shape of each mounting groove matches the shape of each guide plate.

[0039] The fire pump is a centrifugal pump suitable for a variety of flow conditions, and the impeller is a centrifugal impeller.

[0040] The present invention provides a fire pump with an improved flow channel. Through the design of the impeller flow channel, specifically the angles a>b>c, a=(1.01-1.2)b, c=(0.3-0.5)b, it is possible to reduce flow losses in the impeller flow channel, increase the output flow velocity and flow rate of the impeller flow channel, and improve the anti-cavitation performance of the fire pump, thereby improving the hydraulic performance and efficiency of the fire pump.

[0041] The present invention can improve the diversion effect between the various guide plates and within the flow channel through the design of the inclined surface / guide angle, the radial projection length, and the wavy structure of the upstream and downstream parts of the second guide plate, further reduce the flow loss in the impeller flow channel, increase the output flow velocity and flow rate of the impeller flow channel, and improve the anti-cavitation performance of the fire pump, thereby further improving the hydraulic performance and efficiency of the fire pump.

[0042] The above-mentioned embodiments are illustrative of the present invention, not limiting thereof. It is understood that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fire pump with an improved flow passage, comprising a volute, an impeller, a motor, and a sealing device, wherein the impeller is rotatably mounted in the volute, the central hub of the impeller being connected to the motor via a transmission shaft, the impeller comprising a front cover (1), a rear cover (2), and blades (3), wherein a plurality of blades are distributed along a circumferential direction and connected between the front cover and the rear cover, a guide plate is provided between the front cover and the rear cover, and the guide plate is connected to the plurality of blades; Its characteristics are: The guide disc comprises a first guide disc (4), a second guide disc (5), and a third guide disc (6). The first guide disc, the second guide disc, and the third guide disc are sequentially arranged in a radial direction, and each guide disc is in a circular ring shape as a whole. The cross section of the first guide disc is an arc-shaped plate structure, the cross section of the second guide disc is a second flat plate structure, and the cross section of the third guide disc is a third flat plate structure. An angle +a is formed between the chord line of the arc-shaped plate structure and a reference plane, an angle +b is formed between the second flat plate structure and the reference plane, and an angle -c is formed between the third flat plate structure and the reference plane. The reference plane is perpendicular to the rotation axis of the impeller. Angle a≠b≠c, and a>b>c. "+" and "-" represent the direction of the angle. Angle a=(1.01-1.2)b, c=(0.3-0.5)b. The downstream end of the first guide plate (4) is provided with a first inclined surface (41), the upstream end of the second guide plate (5) is provided with a second inclined surface (53), the downstream end of the second guide plate is provided with a third inclined surface (54), and the downstream end of the third guide plate (6) is provided with a fourth inclined surface (61); an included angle d is formed between the first inclined surface and the second inclined surface, and an included angle e is formed between the third inclined surface and the fourth inclined surface, d<e; the included angle d=(0.45-0.65)e, and d=(0.9-1.1)b.

2. A fire pump with an improved flow passage according to claim 1, characterized in that: The first guide plate (4) has a radial projection length L1, the second guide plate (5) has a radial projection length L2, the third guide plate (6) has a radial projection length L3, and a radial projection length L4 is provided between the downstream end of the second guide plate and the upstream end of the third guide plate, where L2>L1>L3>L4.

3. A fire pump with an improved flow passage as claimed in claim 2, characterized in that: The radial projection length L1 = (0.8-0.98) L2, L3 = (0.65-0.85) L2, L4 = (0.05-0.3) L2.

4. A fire pump with an improved flow passage as claimed in claim 3, characterized in that: At least a portion of the upstream portion (51) of the second guide plate (5) is configured to expand into a first wavy structure along the circumference of the impeller, and at least a portion of the downstream portion (52) of the second guide plate is configured to expand into a second wavy structure along the circumference of the impeller, wherein an axial height G1 is provided between the wave crest and the wave trough of the first wavy structure, and an axial height G2 is provided between the wave crest and the wave trough of the second wavy structure, and G2>G1.

5. A fire pump with an improved flow passage as claimed in claim 4, characterized in that: The axial height G2 = (1.02-2) G1.

6. A fire pump with an improved flow passage as claimed in claim 1, characterized in that: The first guide plate (4) is connected to a first mounting groove on the blade (3), the second guide plate (5) is connected to a second mounting groove on the blade, and the third guide plate (6) is connected to a third mounting groove on the blade, and the shape of each mounting groove matches the shape of each guide plate.

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