Centrifugal pump device with blade root fillet impeller

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a centrifugal pump device with a blade root fillet impeller. A centrifugal pump device with a blade root fillet impeller comprises a volute, a volute outlet flange and an impeller inlet flange. A volute outlet flange and an impeller inlet flange are mounted on the volute; an impeller blade is arranged in the volute, and a blade root fillet capable of inhibiting pressure pulsation and flow state disorder is arranged on the impeller blade; the centrifugal pump has the advantages that the impeller blade fillets are arranged between the impeller blades and the rear cover plate of the centrifugal pump, so that pressure pulsation and flow state turbulence are inhibited.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a centrifugal pump device with an impeller with rounded blade roots. Background Art

[0002] Centrifugal pumps are widely used in agriculture and industry today. The main working principle of centrifugal pumps is to use the rotation of the impeller in the centrifugal pump to make the water move centrifugally. However, in the current centrifugal pump technology, the pressure pulsation and flow turbulence generated when the centrifugal pump is working are the main factors affecting the operation of the centrifugal pump.

[0003] Existing technical research on controlling centrifugal pump pressure pulsation and flow turbulence is mainly divided into the following aspects:

[0004] 1. Start with the design parameters of the impeller blades or guide vanes (placement angle, wrap angle, inlet and outlet positions, blade thickness distribution, blade profile, etc.) to study their pulsation and streamline distribution;

[0005] 2. Study and adjust the non-circumferentially symmetrical structure that causes hydraulic excitation, i.e. the volute profile and volute tongue design;

[0006] 3. Research on external devices or new structures to suppress pressure pulsation, such as offset winglets, curved baffles, reverse guide vane design, etc.;

[0007] 4. Study the pressure pulsation of centrifugal pumps under different operating conditions and external conditions. There is a Chinese patent in the field of centrifugal pump technology, with application number 201910491337.X, application date 2019.06.06, and patent name "A double-layer staggered blade impeller" invention patent, and its technical scheme is as follows: a double-layer staggered blade impeller mainly includes a front cover plate, upper blades, a middle partition, lower blades, and a rear cover plate. The front cover plate and the rear cover plate are arranged at a certain distance, and the internal cavity between the two forms a flow channel. A middle partition is provided at the middle streamline of the flow channel to separate the flow channel into upper and lower parts. A number of upper blades are evenly arranged in the flow channel between the front cover plate and the middle partition plate, and an equal number of lower blades are evenly arranged in the flow channel between the rear cover plate and the middle partition plate. The outer side of the rear cover plate is connected to a hub. The upper blades and the lower blades are arranged in a staggered manner, and the angle between the two is 1 / 3 to 1 / 2 of the angle of a single flow channel.

[0008] Although the above patent can improve the stability of pump operation and reduce the pressure pulsation in the pump, the staggered arrangement of the blades is too complicated, and the technical requirements for designing the flow angle of the blades are high, and the implementation conditions are harsh. Utility Model Content

[0009] The utility model aims to provide a centrifugal pump device with an impeller with a blade root rounded corner, which adopts an impeller blade rounding arranged between the impeller blade and the rear cover plate of the centrifugal pump to suppress pressure pulsation and flow disorder.

[0010] In order to achieve the above technical effects, the technical solution of the utility model is as follows:

[0011] A centrifugal pump device with an impeller with a chamfered blade root, characterized in that it includes a volute, a volute outlet flange and an impeller inlet flange; the volute is equipped with a volute outlet flange and an impeller inlet flange; the volute is provided with an impeller blade inside, and the impeller blade is provided with a blade root chamfer that can suppress pressure pulsation and flow turbulence.

[0012] Furthermore, the blade root rounded corner is arranged at the root connection between the rear cover plate and the impeller blade.

[0013] Furthermore, the radius of the blade root fillet is 3% to 5% of the impeller outlet width.

[0014] Furthermore, a fixed guide vane and a runner are installed inside the volute; the runner is installed on the fixed guide vane, and the runner rotates on the fixed guide vane.

[0015] Furthermore, the impeller includes a front cover plate and impeller blades; the front cover plate is installed on the movable guide vane.

[0016] Furthermore, the volute is connected to the pump shaft, and the rotation of the pump shaft drives the impeller blades to rotate; the connection between the pump shaft and the volute is sealed by bearings and bolts.

[0017] Furthermore, a motor is sleeved on the pump shaft.

[0018] Furthermore, the motor is mounted on the motor base by bolts.

[0019] Furthermore, the volute is mounted on the volute base by bolts.

[0020] Furthermore, the volute outlet flange is connected to a water inlet pipe; and the water inlet pipe is a bent axis type water pipe.

[0021] According to the above technical solution, the utility model has the following beneficial effects:

[0022] 1. The utility model adopts the impeller blade chamfer arranged between the impeller blade and the rear cover plate of the centrifugal pump, which achieves the advantages of suppressing pressure pulsation and flow disorder.

[0023] 2. The utility model adopts fixed guide vanes. When the impeller rotates to drive the water flow centrifugally, the liquid can maintain a smooth and regular speed, achieving the advantage that the volute outlet flange can ensure the stable outflow of liquid when the utility model is working.

[0024] 3. The utility model adopts a motor to allow the pump shaft to drive the impeller to rotate to perform centrifugal work, thereby saving manpower and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model.

[0026] Figure 2 It is a top view schematic diagram of the structure of the utility model.

[0027] Figure 3 It is a side view schematic diagram of the utility model.

[0028] Figure 4 It is a front view schematic diagram of the utility model.

[0029] Figure 5 It is a longitudinal sectional schematic diagram of the volute part of the utility model.

[0030] Figure 6 It is a schematic cross-sectional view of the volute part of the utility model.

[0031] Figure 7 It is a schematic diagram of the rotating wheel structure of the utility model.

[0032] Figure 8 It is a schematic diagram of a water inlet pipe connected to the utility model.

[0033] Fig. 9 It is a schematic cross-sectional view of the fixed guide vane and the volute of the utility model.

[0034] In the attached figure: 1-motor; 2-motor base; 3-volute; 4-volute base; 5-volute outlet flange; 6-impeller inlet flange; 7-pump shaft; 8-impeller blades; 9-blade root chamfer; 10-rear cover plate; 11-front cover plate; 12-fixed guide vanes; 13-water inlet pipe. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0036] Example 1

[0037] like Figure 1 and Figure 4 As shown, a centrifugal pump device having an impeller with a blade root rounded corner 9 is characterized in that it includes a volute 3, a volute outlet flange 5 and an impeller inlet flange 6; Figure 2 and Figure 6 As shown, a volute outlet flange 5 and an impeller inlet flange 6 are installed on the volute 3; an impeller blade 8 is arranged inside the volute 3, and a blade root chamfer 9 is arranged on the impeller blade 8 to suppress pressure pulsation and flow turbulence.

[0038] like Figure 5 As shown, the blade root chamfer 9 is set at the root connection of the rear cover plate 10 and the impeller blade 8; the radius of the blade root chamfer 9 is 3%~5% of the impeller outlet width; the present application sets the blade root chamfer 9 with a radius of 2mm and 5mm respectively at the connection between the blade root and the rear cover. After testing, it is found that the blade root chamfer 9 with a radius of 2mm is set. Compared with the centrifugal pump without the blade root chamfer 9, the centrifugal pump with a blade root chamfer 9 has an increase in head under all working conditions, with an average increase of 1%, and the maximum increase at the design flow rate is 1.36%; the radius is set to 5mm Compared with the blade root chamfer 9 with a radius of 2mm, the blade root chamfer 9 has a slight improvement under all working conditions, with an average improvement of 0.3%, and the maximum improvement of 0.687% at 95% of the design flow rate; according to the experimental data, it can be seen that the performance of the centrifugal pump with the increase of the blade root chamfer 9 is more obvious than that of the centrifugal pump without the increase of the blade root chamfer 9, and the performance improvement of the blade root chamfer 9 with a further increase in radius gradually decreases, so the performance improvement effect is best when the radius of the blade root chamfer 9 is set to 3%~5% of the impeller outlet width.

[0039] Example 2

[0040] like Figure 1 and Figure 4 As shown, a centrifugal pump device having an impeller with a blade root rounded corner 9 is characterized in that it includes a volute 3, a volute outlet flange 5 and an impeller inlet flange 6; Figure 2 and Figure 6 As shown, a volute outlet flange 5 and an impeller inlet flange 6 are installed on the volute 3; an impeller blade 8 is arranged inside the volute 3, and a blade root chamfer 9 is arranged on the impeller blade 8 to suppress pressure pulsation and flow turbulence.

[0041] like Figure 5As shown, the blade root chamfer 9 is set at the root connection of the rear cover plate 10 and the impeller blade 8; the radius of the blade root chamfer 9 is 3%~5% of the impeller outlet width; the present application sets the blade root chamfer 9 with a radius of 2mm and 5mm respectively at the connection between the blade root and the rear cover. After testing, it is found that the blade root chamfer 9 with a radius of 2mm is set. Compared with the centrifugal pump without the blade root chamfer 9, the centrifugal pump with a blade root chamfer 9 has an increase in head under all working conditions, with an average increase of 1%, and the maximum increase at the design flow rate is 1.36%; the radius is set to 5mm Compared with the blade root chamfer 9 with a radius of 2mm, the blade root chamfer 9 has a slight improvement under all working conditions, with an average improvement of 0.3%, and the maximum improvement of 0.687% at 95% of the design flow rate; according to the experimental data, it can be seen that the performance of the centrifugal pump with the increase of the blade root chamfer 9 is more obvious than that of the centrifugal pump without the increase of the blade root chamfer 9, and the performance improvement of the blade root chamfer 9 with a further increase in radius gradually decreases, so the performance improvement effect is best when the radius of the blade root chamfer 9 is set to 3%~5% of the impeller outlet width.

[0042] like Figure 5 , Figure 6 , Figure 7 and Fig. 9 As shown, a fixed guide vane 12 and a runner are installed inside the volute 3; the runner is installed on the fixed guide vane 12, and the runner rotates on the fixed guide vane 12; the fixed guide vane 12 is non-rotatable, and the runner rotates on the fixed guide vane 12, and the fixed guide vane 12 and the runner are in the same plane. When the runner rotates rapidly to drive the water flow to perform centrifugal motion, the water flow follows the fixed guide vane 12 to allow the water flow to enter the volute 3 at a smooth and regular speed, so that the volute outlet flange 5 can ensure the stable outflow of the water flow.

[0043] The impeller includes a front cover plate 11 and impeller blades 8; the front cover plate 11 is installed on the movable guide vane; the volute 3 is connected to the pump shaft 7, and the rotation of the pump shaft 7 drives the impeller blades 8 to rotate; the connection between the pump shaft 7 and the volute 3 is sealed by bearings and bolts, and the function of the seal is to prevent leakage when the centrifugal pump is working.

[0044] like Figure 2 and Figure 3 As shown, a motor 1 is sleeved on the pump shaft 7; the motor 1 is mounted on the motor base 2 by bolts; the motor 1 drives the pump shaft 7 to rotate, thereby driving the impeller to rotate; the volute 3 is mounted on the volute base 4 by bolts; the volute outlet flange 5 is connected to the water inlet pipe 13; the water inlet pipe 13 is a bent axis water pipe; the water inlet pipe 13 can also be a water inlet pipe 13 in other forms.

[0045] Example 3

[0046] Based on Example 1 and Example 2, Figure 1 , Figure 2 and Figure 3As shown, when the centrifugal pump device is turned on, the motor 1 placed on the motor 1 support starts to work. Since the motor 1 is sleeved on the pump shaft 7, the motor 1 drives the pump shaft 7 to rotate, and the rotation of the pump shaft 7 drives the impeller to rotate. At this time, the water flow drawn from the water inlet pipe 13 enters from the impeller inlet flange 6, and through the rotation of the impeller, the impeller blades 8 rotate to perform centrifugal motion. At this time, the water flows along the fixed guide vanes 12 to allow the liquid to enter the volute 3 at a smooth and regular speed, and finally the water flows out steadily from the volute outlet flange 5.

[0047] The above description is a detailed description of the preferred feasible embodiment of the present application, but the embodiment is not intended to limit the patent application scope of the present application. All equivalent changes or modified changes made under the technical spirit suggested by the present application should fall within the patent scope covered by the present application.

Claims

1. A centrifugal pump device having an impeller with rounded blade roots, characterized in that: The invention comprises a volute (3), a volute outlet flange (5) and an impeller inlet flange (6); the volute outlet flange (5) and the impeller inlet flange (6) are mounted on the volute (3); an impeller blade (8) is arranged inside the volute (3), and the impeller blade (8) is provided with a blade root fillet (9) capable of suppressing pressure pulsation and flow turbulence.

2. A centrifugal pump device with an impeller having a rounded blade root according to claim 1, characterized in that: The blade root fillet (9) is arranged at the root connection between the rear cover plate (10) and the impeller blade (8).

3. A centrifugal pump device with an impeller having a rounded blade root according to claim 2, characterized in that: The radius of the blade root fillet (9) is 3% to 5% of the impeller outlet width.

4. A centrifugal pump device with an impeller having a rounded blade root according to claim 1, characterized in that: A fixed guide vane (12) and a runner are installed inside the volute (3); the runner is installed on the fixed guide vane (12), and the runner rotates on the fixed guide vane (12).

5. A centrifugal pump device with an impeller having a rounded blade root according to claim 4, characterized in that: The impeller comprises a front cover plate (11) and impeller blades (8); the front cover plate (11) is mounted on the movable guide vane.

6. A centrifugal pump device with an impeller having a rounded blade root according to claim 5, characterized in that: The volute (3) is connected to the pump shaft (7), and the rotation of the pump shaft (7) drives the impeller blades (8) to rotate; the connection between the pump shaft (7) and the volute (3) is sealed by means of bearings and bolts.

7. A centrifugal pump device with an impeller having a rounded blade root according to claim 6, characterized in that: The pump shaft (7) is sleeved with a motor (1).

8. A centrifugal pump device with an impeller having a rounded blade root according to claim 7, characterized in that: The motor (1) is mounted on a motor base (2) by means of bolts.

9. A centrifugal pump device with an impeller having a rounded blade root according to claim 4 or 6, characterized in that: The volute (3) is mounted on the volute base (4) by means of bolts.

10. A centrifugal pump device with an impeller having a rounded blade root according to claim 9, characterized in that: The volute outlet flange (5) is connected to a water inlet pipe (13); the water inlet pipe (13) is a bent axis type water pipe.

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