Optimization method for shape of suction chamber of double-suction pump with low vibration noise

Abstract

The application relates to a method for optimizing the shape of a water suction chamber of a double-suction pump with low vibration noise, characterized by the following steps: drawing a drawing according to the shape of the double-suction pump, the double-suction pump being provided with a water suction chamber and a water pressure chamber, and a water guide cone being arranged at the position where the water suction chamber and the water pressure chamber intersect; designing the cross-section height T h1 =k1D0 of the water guide cone and the cross-section width T w1 =k2b2 of the water guide cone, wherein D0 is the water inlet diameter of the water suction chamber, the value range of k1 is 0.05-0.5, b2 is the outlet width of the impeller, and the value range of k2 is 0.05-2; dividing the water guide cone into n cross sections from the start to the end, determining the initial cross section area S1 of the water guide cone, and the initial cross section area S1 of the water guide cone to the final cross section area S n are linearly increased or non-linearly increased. The application further improves the rationality of the shape structure of the water suction chamber of the double-suction pump and reduces the vibration and noise generated by the water suction chamber.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of water pump design, in particular to a low-vibration-noise double-suction pump suction chamber shape optimization method. BACKGROUND

[0002] The double-suction pump is a kind of centrifugal pump, has the characteristics of high lift and large flow, and is widely used in engineering.

[0003] Referring to Figure 1 As shown in the figure, the double-suction pump comprises a suction chamber 1 and an impeller chamber, the suction chamber 1 has one inlet and two outlets, liquid enters from the inlet and then is discharged from the two outlets into the impeller chamber (water pressure chamber 2). In this way, the structural design of the suction chamber 1, the fluid in the inlet direction will directly impact on the wall surface of the suction chamber 1, which will cause a large impact force, and the water flow changes greatly in this direction, resulting in large hydraulic loss.

[0004] Secondly, this structure causes the area of the end surface of the suction chamber 1 to change greatly at the separated cross sections, and the sudden change of the over-flow end surface will cause flow separation, and the flow separation will cause the wall surface of the suction chamber 1 to bear a large unsteady surface force due to the large flow of the double-suction pump, thereby causing the suction chamber 1 to vibrate and produce noise, and in severe cases, the structure of the suction chamber 1 will be damaged.

[0005] At the same time, due to the large diameter of the inlet of the suction chamber 1, it is difficult to ensure the uniformity of the incoming flow. The non-uniformity of the flow in the inlet flow passage of the suction chamber 1 will cause the inlet flow pattern of the impeller to change, and will aggravate the pressure pulsation in the pump. The sudden change of the end surface of the suction chamber 1 of the double-suction pump will cause the flow separation to be more serious. SUMMARY

[0006] In order to further improve the rationality of the shape structure of the suction chamber of the double-suction pump and reduce the vibration and noise generated by the suction chamber, the application provides a low-vibration-noise double-suction pump suction chamber shape optimization method.

[0007] The low-vibration-noise double-suction pump suction chamber shape optimization method provided by the application adopts the following technical scheme:

[0008] A low-vibration-noise double-suction pump suction chamber shape optimization method comprises the following steps:

[0009] Draw a drawing according to the shape of the double-suction pump, the double-suction pump has a suction chamber and a pressure chamber, and a water guide cone is arranged at the position where the suction chamber and the pressure chamber intersect;

[0010] Design the cross-sectional height T of the water guide cone h1 =k1D0, and the cross-sectional width T of the water guide cone w1=k2b2, wherein, D0 is the water inlet diameter of the water absorption chamber, k1 is in the range of 0.05-0.5, b2 is the impeller outlet width, and k2 is in the range of 0.05-2;

[0011] The water guide cone is divided into n sections from the initial section to the final section, the initial section area S1 of the water guide cone is determined, the initial section area S1 of the water guide cone to the final section area S n is linear growth or nonlinear growth.

[0012] Preferably, in the determination of the initial section area S1 of the water guide cone, the initial section area wherein Q is the design flow of the double-suction pump, v is the impeller inlet flow velocity under the design flow of the double-suction pump, and a1 is a constant coefficient, and a1 is in the range of 0.6-5.

[0013] Preferably, the initial section area S1 of the water guide cone to the final section area S n is linear growth, and the linear growth conforms to the following calculation formula:

[0014] S2=f1S1

[0015] S3=f2S2

[0016] …

[0017] S n =f n S n-1

[0018] wherein f n is in the range of 1.1-1.5.

[0019] Preferably, the initial section area S1 of the water guide cone to the final section area S n is nonlinear growth, and the nonlinear growth conforms to the following calculation formula:

[0020] S=a+f n *ln(n);

[0021] wherein a and f n are constant coefficients.

[0022] Preferably, the initial section area S1 of the water guide cone to the final section area S n is nonlinear growth, and the nonlinear growth is sinusoidal distribution, and the sinusoidal distribution conforms to the following calculation formula:

[0023] S=a+sin(ω*n+b);

[0024] wherein a, ω, and b are constant coefficients.

[0025] Preferably, the section width Tw1 The water guide cone is arranged in size at the position where the suction chamber and the pressure chamber intersect, the small end of the water guide cone is directed to the side of the water inlet of the suction chamber, and the two side walls of the water guide cone are arc-shaped.

[0026] Preferably, the connection of the water guide cone at the position where the suction chamber and the pressure chamber intersect is a straight line or a curve.

[0027] Preferably, the method further comprises the following steps:

[0028] A partition plate is arranged in the suction chamber, the partition plate penetrates the suction chamber, and the position of the partition plate is close to the side of the water inlet of the suction chamber relative to the water guide cone;

[0029] The length of the partition plate is designed as G l =k3D0, and the thickness of the partition plate is G w =k4D0, wherein the value range of k3 is 0.01-0.4, and the value range of k4 is 0.5-1.5D0.

[0030] The distance between the partition plate and the starting position of the water guide cone is designed as W=k5D0, wherein the value range of k5 is 0.3-2.0D0.

[0031] In summary, the present application comprises at least one of the following beneficial technical effects:

[0032] 1. The present application improves the structure of single inlet to two sides by the design of the water guide cone, the change law between each flow cross section is more smooth, the flow separation phenomenon can be significantly improved, the flow vortex of the flow cross section direction caused by the rapid change of the cross section area can be inhibited, the non-uniform surface force caused by the uneven pressure of the suction chamber wall surface caused by the flow separation can be effectively improved, and then the vibration and noise can be inhibited.

[0033] 2. The partition plate in the suction chamber of the present application can further uniformly the flow field in the suction chamber, improve the flow separation phenomenon, and provide a better inlet flow state for the impeller inlet. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a double-suction pump in the prior art.

[0035] Figure 2 It is a first structural schematic diagram of a double-suction pump in the present embodiment.

[0036] Figure 3 It is a second structural schematic diagram of a double-suction pump in the present embodiment.

[0037] Figure 4 It is a cross-sectional area schematic diagram of a water guide cone in the present embodiment.

[0038] Figure 5is a first structural state schematic diagram of the water guide cone in the embodiment.

[0039] Figure 6 is a second structural state schematic diagram of the water guide cone in the embodiment.

[0040] Reference signs: 1, water suction chamber; 2, water pressure chamber; 3, water guide cone; 4, partition plate. DETAILED DESCRIPTION

[0041] The following will be described in detail in combination with the accompanying Figures 2-6 The application is further described in detail.

[0042] A method for optimizing the shape of a water suction chamber of a double-suction pump with low vibration and noise, referring to Figure 2 and Figure 3 includes the following steps:

[0043] Step S100, drawing a drawing according to the shape of the double-suction pump, the double-suction pump has a water suction chamber 1 and a water pressure chamber 2, and a water guide cone 3 is arranged at the position where the water suction chamber 1 and the water pressure chamber 2 intersect.

[0044] According to the technical scheme defined in step S100, specifically, the water suction chamber 1 of the double-suction pump has one water inlet and two water outlets, the two water outlets of the water suction chamber 1 are located on both sides respectively, the two water outlets of the water suction chamber 1 are communicated with the water pressure chamber 2, and an impeller is arranged in the water pressure chamber 2. The water pressure chamber 2 can also be called an impeller chamber. The position where the water suction chamber 1 and the water pressure chamber 2 intersect is the wall surface of the double-suction pump, which is opposite to the water inlet of the water suction chamber 1. The liquid in the water inlet of the water suction chamber 1 will directly impact on the wall surface, and then be dispersed to the water outlets on both sides to enter the water pressure chamber 2.

[0045] Among them, the water guide cone 3 is arranged at the position where the water suction chamber 1 and the water pressure chamber 2 intersect, the water guide cone 3 is arranged on the wall surface of the double-suction pump, and the water guide cone 3 is distributed from top to bottom. Therefore, the liquid sucked from the water inlet of the water suction chamber 1 will directly impact on the water guide cone 3, and will flow to both sides through the flow distribution of the water guide cone 3, so as to reduce the impact on the wall surface of the water suction chamber 1.

[0046] Step S200, designing the cross-sectional height T h1 of the water guide cone 3 and the cross-sectional width T w1 of the water guide cone 3, wherein D0 is the diameter of the water inlet of the water suction chamber 1, k1 is in the range of 0.05-0.5, b2 is the outlet width of the impeller, and k2 is in the range of 0.05-2.

[0047] According to the technical scheme defined in step S200, specifically, the cross-sectional width T w1 of the water guide cone 3 at the position where the water suction chamber 1 and the water pressure chamber 2 intersect, i.e. the cross-sectional width Tw1 The cross-sectional width refers to the cross-sectional width of the connection between the water guide cone 3 and the wall surface of the water suction chamber 1, wherein the connection of the water guide cone 3 at the position where the water suction chamber 1 and the water compression chamber 2 are connected is a straight line or a curve.

[0048] In one embodiment, the water guide cone 3 is arranged in a size end manner, the small end of the water guide cone 3 is directed to the water inlet side of the water suction chamber 1, and the two side walls of the water guide cone 3 are arc-shaped.

[0049] In step S300, the water guide cone 3 is divided into n cross sections from the initial to the final, the initial cross section area S1 of the water guide cone 3 is determined, and the initial cross section area S1 of the water guide cone 3 to the final cross section area S n is linear growth or nonlinear growth.

[0050] According to the technical solution defined in step S300, specifically, referring to Figure 4 and Figure 5 , taking the vertical placement of the double-suction pump as the reference direction, the initial position of the water guide cone 3 is the upper wall surface of the water suction chamber 1, and the final position of the water guide cone 3 is the lower wall surface of the water suction chamber 1, thereby the initial cross section area S1 of the water guide cone 3 can be determined.

[0051] In the determination of the initial cross section area S1 of the water guide cone 3, the initial cross section area wherein Q is the design flow of the double-suction pump, v is the impeller inlet flow rate under the design flow of the double-suction pump, a1 is a constant coefficient, the value range of a1 is 0.6-5, the design flow Q of the double-suction pump and the impeller inlet flow rate v under the design flow of the double-suction pump are constant values, and thus a determined initial cross section area S1 of the water guide cone 3 can be obtained.

[0052] In one embodiment, the initial cross section area S1 of the water guide cone 3 to the final cross section area S n is linear growth, and the linear growth conforms to the following calculation formula:

[0053] S2=f1S1

[0054] S3=f2S2

[0055] …

[0056] S n =f n S n-1

[0057] wherein the value range of f n is 1.1-1.5.

[0058] In another embodiment, the initial cross section area S1 of the water guide cone 3 to the final cross section area S n is nonlinear growth, and the nonlinear growth conforms to the following calculation formula:

[0059] S = a + f n ln(n);

[0060] wherein a and f n are constant coefficients, and a and f n may be valued according to actual conditions.

[0061] In another embodiment, referring to Figure 6 , the initial cross-sectional area S1 to the final cross-sectional area S n of the water guide cone 3 is nonlinearly increased, and the nonlinear increase is a sinusoidal distribution, which is in accordance with the following calculation formula:

[0062] S = a + sin(ω * n + b);

[0063] wherein a, ω and b are constant coefficients. a, ω and b may be valued according to actual conditions.

[0064] The following illustrates the specific setting position and specific setting parameters of the water guide cone 3.

[0065] In this embodiment, the design flow rate Q of the double-suction pump is defined as 0.2333 m 3 / s, the impeller inlet flow rate v is 3.3 m / s, and the constant coefficient a1 is 3.7, so that the initial cross-sectional area S1 of the water guide cone 3 is calculated as 3060.6 mm 2 .

[0066] The inlet diameter D0 of the water suction chamber 1 is defined as 300 mm, and k1 is 0.419, so that the cross-sectional height T h1 of the water guide cone 3 is calculated as k1D0 = 97.4 mm; the impeller outlet width b2 is defined as 73.5 mm, and k2 is 1.7, so that the cross-sectional width T w1 of the water guide cone 3 is calculated as k2b2 = 125.7 mm.

[0067] In this embodiment, the initial cross-sectional area S1 to the final cross-sectional area S n of the water guide cone 3 is linearly increased, the water guide cone 3 is divided into three cross sections from the initial to the final, the cross-sectional area S2 of the water guide cone 3 is 3366.66 mm 2 , f1 is 1.1, the cross-sectional area S3 of the water guide cone 3 is 3703.326 mm 2 , and f2 is 1.1.

[0068] It is worth noting that this embodiment only limits the cross-sectional width T w1 and the cross-sectional height T h1 of the water guide cone 3, and further limits the initial cross-sectional area S1 to the final cross-sectional area S nThus, the shape design of the water guide cone 3 is more convenient and efficient.

[0069] The optimization method of the low-vibration and low-noise double-suction pump water suction chamber shape provided in the embodiment refers to Figure 5 and further includes the following steps:

[0070] Step S400, a partition plate 4 is arranged in the water suction chamber 1, the partition plate 4 penetrates the water suction chamber 1, and the position of the partition plate 4 is close to the water inlet side of the water suction chamber 1 relative to the water guide cone 3;

[0071] Step S500, the length of the partition plate 4 is designed as G l =k3D0, the thickness of the partition plate 4 is G w =k4D0, wherein the value range of k3 is 0.01-0.4, and the value range of k4 is 0.5-1.5D0.

[0072] Step S600, the distance W between the partition plate 4 and the starting position of the water guide cone 3 is designed as k5D0, wherein the value range of k5 is 0.3-2.0D0.

[0073] According to the technical scheme defined in steps S400-S600, the partition plate 4 penetrates the water suction chamber 1, the two ends of the partition plate 4 are fixed on the two wall surfaces of the water suction chamber 1, the partition plate 4 can penetrate the water suction chamber 1 horizontally, vertically, or obliquely, and the position of the partition plate 4 only needs to be close to the water inlet side of the water suction chamber 1 relative to the water guide cone 3. It is worth noting that the partition plate 4 can be one or multiple, but the length and thickness of each partition plate 4 are the same, the distance between each partition plate 4 and the starting position of the water guide cone 3 is the same, and the shape of each partition plate 4 is the same. The partition plate 4 can be a straight plate, and the partition plate 4 can also be curved.

[0074] The length, thickness, and distance of the partition plate 4 are described below.

[0075] The length of the partition plate 4 is G l =k3D0, the thickness of the partition plate 4 is G w =k4D0, the water inlet diameter D0 of the water suction chamber 1 is 300 mm, k3=0.73, k4=0.1, and k5=0.9, so the length G l of the partition plate 4 is 219 mm, the thickness G w of the partition plate 4 is 30 mm, and the distance W between the partition plate 4 and the starting position of the water guide cone 3 is 270 mm.

[0076] Thus, the application improves the structure of single inlet to two sides by the design of the water cone 3, the change law between each flow section is more smooth, which can significantly improve the flow separation phenomenon, inhibit the flow vortex of the flow section direction caused by the rapid change of the section area, effectively improve the unsteady surface force caused by the uneven pressure of the wall surface of the water suction chamber 1 caused by flow separation, and further inhibit vibration and noise.

[0077] The partition plate 4 in the water suction chamber 1 in the application can further play a role in uniformizing the flow field in the water suction chamber 1, improving the flow separation phenomenon, and providing a better inlet flow state for the impeller inlet.

[0078] The above are preferred embodiments of the application, which do not limit the protection scope of the application, so: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A method for optimizing the shape of a suction chamber of a double suction pump with low vibration noise, characterized in that, It comprises the following steps: Draw a drawing according to the shape of the double-suction pump, which has a suction chamber (1) and a pressure chamber (2) inside, and a water guide cone (3) is arranged at the position where the suction chamber (1) and the pressure chamber (2) intersect; The cross-sectional height T of the draft cone (3) is designed h1 = k1D0, and the cross-sectional width T of the draft cone (3) is designed w1 = k2b2, wherein D0 is the water inlet diameter of the water suction chamber (1), k1 is in the range of 0.05-0.5, b2 is the outlet width of the impeller, and k2 is in the range of 0.05-2. The water guide cone (3) is divided into n sections from the initial to the final, the initial section area S1 of the water guide cone (3) is determined, the initial section area S1 of the water guide cone (3) to the final section area S n is linear growth or nonlinear growth.

2. A method of optimizing the shape of a suction chamber of a double suction pump with low vibration noise according to claim 1, characterized in that, In determining the initial cross-sectional area S1 of the water cone (3), the initial cross-sectional area S1 Wherein, Q is the design flow of the double-suction pump, v is the impeller inlet flow velocity under the design flow of the double-suction pump, a1 is a constant coefficient, and the value range of a1 is 0.6-5.

3. A method of optimizing the shape of the suction chamber of a double suction pump with low vibration noise according to claim 1, characterized in that, The starting cross-sectional area S1 to the final cross-sectional area S of the water cone (3) n is linear, which corresponds to the following calculation formula: S2=f1S1 S3=f2S2 …… S n = f n S n-1 wherein f n is in the range of 1.1-1.

5.

4. A method of optimizing the shape of the suction chamber of a double suction pump with low vibration noise according to claim 1, characterized in that, The starting cross-sectional area S1 to the final cross-sectional area S of the water cone (3) n is a non-linear increase, which corresponds to the following calculation formula: S = a + f n ln(n); where a and f n are constant coefficients.

5. A method of optimizing the shape of the suction chamber of a double suction pump with low vibration noise according to claim 1, characterized in that, The starting cross-sectional area S1 to the final cross-sectional area S of the water cone (3) n is a non-linear increase, the non-linear increase is a sinusoidal distribution, the sinusoidal distribution meets the following calculation formula: S=a+sin(ω*n+b); Wherein, a, ω and b are constant coefficients.

6. A method of optimizing the shape of a suction chamber of a double suction pump with low vibration noise according to claim 1, characterized in that, The cross-sectional width T of the water guide cone (3) w1 The water guide cone (3) is arranged in a size end manner at the position where the suction chamber (1) and the pressurizing chamber (2) intersect, the small end of the water guide cone (3) faces the water inlet side of the suction chamber (1), and the two side walls of the water guide cone (3) are arc-shaped.

7. A method of optimizing the shape of the suction chamber of a double suction pump with low vibration noise according to claim 6, characterized in that, The connection of the water guide cone (3) at the intersecting position of the suction chamber and the pressure chamber (2) is a straight line or a curve.

8. A method of optimizing the shape of the suction chamber of a double suction pump with low vibration noise according to claim 1, characterized in that, It also comprises the following steps: A partition (4) is arranged in the suction chamber (1), the partition (4) penetrates the suction chamber (1), and the position of the partition (4) is close to the water inlet side of the suction chamber (1) relative to the water guide cone (3); The length of the partition (4) is G l The thickness of the partition (4) is G w The thickness of the partition (4) is G w k3D0, k4D0, wherein k3 is in the range of 0.01-0.4 and k4 is in the range of 0.5-1.5D0. The distance W between the partition (4) and the starting position of the water guide cone (3) is designed as k5D0, wherein the value range of k5 is 0.3-2.0D0.

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