CN111536076A - Medium-specific-speed double-outlet volute pump - Google Patents

Abstract

The invention discloses a medium-specific speed double-outlet volute pump. A circular flow guide plate is arranged in the inner annular opening of the double-outlet volute, an impeller is sleeved at the inner annular opening of the double-outlet volute, and the bottom of the impeller is connected to the bottom of the impeller. One end of the suction pipe is connected; the blade in the impeller adopts a backward-curved structure, the water inlet edge of the blade extends to the opening at the bottom of the impeller, and the front and back sides of the blade are smoothly connected from top to bottom by curved surfaces with different curvatures. The invention provides a medium specific speed double outlet volute pump, which realizes two-way water discharge through two water flow outlets, improves the outflow efficiency of the pump, and at the same time enhances the speed component of the water flow in the circumferential direction of the volute, improving the pump outlet. The water flow conditions at the place can reduce the hydraulic loss, so that the volute pump has good hydraulic performance and operating efficiency.

Description

A medium specific speed double outlet volute pump

technical field

The invention relates to a double outlet volute casing pump with a medium specific speed and belongs to the technical field of volute casing pumps.

Background technique

At present, a pump is a machine that transports or pressurizes a fluid, which transfers the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. The main flow components of a volute pump are the impeller and the volute. The hydraulic structure of the volute has a crucial impact on the efficiency of the pump.

At present, people's research on the volute pump mainly focuses on the area and shape of the section, the throat area and the angle of the separation tongue, etc. The number of outlets of the volute has not been changed and the design and optimization have been made to improve the pump efficiency.

Therefore, how to overcome the deficiencies of the existing technology has become one of the key problems to be solved urgently in the technical field of the volute pump.

SUMMARY OF THE INVENTION

Objective: In order to overcome the deficiencies in the prior art, the present invention provides a medium specific speed double outlet volute pump.

Technical scheme: in order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A medium specific rotational speed double outlet volute pump, comprising: a double outlet volute, a circular baffle is arranged in the inner annular opening of the double outlet volute, and an impeller is sleeved at the inner annular opening of the double outlet volute , the bottom of the impeller is connected with one end of the suction pipe; the blade in the impeller adopts a backward curved structure, the inlet edge of the blade extends to the opening at the bottom of the impeller, and the front and back of the blade are smoothly connected from top to bottom by curved surfaces with different curvatures .

As a preferred solution, the centers of the water suction pipe, the impeller, the deflector and the double outlet volute are on the same axis.

As a preferred solution, the blade backward bending angle θ is set to be 35°-45°.

As a preferred solution, the double outlet volute has two water outlets in the circumferential direction.

As a preferred solution, the two water flow outlets are arranged symmetrically in the center.

As a preferred solution, the number of blades of the impeller is 4-8.

As a preferred solution, the cross-sectional airfoil curves of the front and back surfaces of the blade from top to bottom are set as follows:

At a distance of 15mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows:

y= ^5.90536 × ^10-9x4 + ^7.85472 × ^{10-7x3 +} 0.00433x2-0.64408x-74.91562

The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows:

y=0.00453x2-0.64346x ^- 80.21352

At 30mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows:

y= ^8.51429 × ^{10-8x4-3.24432 × 10-5x3 +} 0.00898x2-0.85396x-76.80993

The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows:

y= ^1.21106 × ^{10-7x4-4.41294 × 10-5x3 +} 0.00984x2-0.84698x-82.60417

At a distance of 45mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows:

y= ^1.67549 × ^{10-7x4-6.09372 × 10-5x3 +} 0.01191x2-0.89008x-83.98501

The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows:

y= ^2.04153 × ^{10-7x4-7.03872 × 10-5x3 +} 0.01219x2-0.84686x-89.92346

At 60mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows:

y = -3.13326×10 ^-9 x ⁵ +1.28277×10 ^-6 x ⁴ -1.83507×10 ^-4 x ³ +0.01513x ² -0.72108x-94.5626

The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows:

y=-2.59883×10 ^-9 x ⁵ +1.0539×10 ^-6 x ⁴ -1.49816×10 ^-4 x ³ +0.01292x ² -0.65976x-99.19258

At a distance of 75mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows:

y=4.34299×10 ^-7 x ⁴ -1.02267×10 ^-4 x ³ +0.01166x ² -0.60009x-103.24091

The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows:

y= ^4.25496 × ^{10-7x4-9.34081 × 10-5x3 +} 0.01042x2-0.55726x-107.43066

At 90mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows:

y= ^7.16724 × ^{10-7x4-9.78411 × 10-5x3 +} 0.00819x2-0.44165x-112.25216

The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows:

y= ^1.02502 × ^{10-6x4-9.44505 × 10-5x3 +} 0.00641x2-0.42197x-116.02084

At a distance of 105mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows:

y= ^1.62071 × ^{10-6x4-6.59471 × 10-6x3 +} 0.0056x2-0.42675x-123.5046

The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows:

y ^{= 2.94938x10-6x4} + ^{9.18226x10-5x3 + 0.00611x2-0.44197x} -128.2289.

Beneficial effects: The medium specific speed double outlet volute pump provided by the present invention realizes two-way water outlet through two water flow outlets, improves the outflow efficiency of the pump, and at the same time enhances the velocity component of the water flow in the circumferential direction of the volute, improving the efficiency of the pump. The water flow conditions at the pump outlet are improved, and the hydraulic loss is reduced, so that the volute pump has good hydraulic performance and operating efficiency.

Description of drawings

Figure 1 is a schematic structural diagram of a medium specific speed double outlet volute pump proposed by the present invention.

FIG. 2 is a schematic cross-sectional view of the double outlet volute proposed by the present invention.

FIG. 3 is a schematic structural diagram of the blade backward curved structure proposed by the present invention.

FIG. 4 is a schematic diagram of the airfoil curve at different distances from the top of the impeller on the blade proposed by the present invention.

FIG. 5 is a top view of a plurality of blades in the impeller proposed by the present invention.

FIG. 6 is a front view of a plurality of blades in the impeller proposed by the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, a medium specific speed double outlet volute pump includes a suction pipe 1, an impeller 2, a baffle 3, and a double outlet volute 4 in sequence according to the direction of water flow. The double outlet volute 4. A circular deflector 3 is arranged in the inner annular opening, an impeller 2 is sleeved at the inner annular opening of the double outlet volute 4, and the bottom of the impeller 2 is connected with one end of the suction pipe 1; the blades 201 in the impeller 2 are bent backward The water inlet edge of the blade extends to the opening at the bottom of the impeller 2 to improve the cavitation performance.

As shown in FIG. 3 , the backward bending angle θ of the blade 201 is set to be 35°-45°, which is used to effectively ensure the contact area between the blade and the liquid and improve the radial thrust.

As shown in FIG. 4 , the front and back surfaces of the blade 201 are smoothly connected by curved surfaces with different curvatures from top to bottom, and the cross-sectional airfoil curves of the front and back surfaces of the blade 201 from top to bottom are set as follows:

15mm from the top of the impeller 2, the values of the point coordinates on the airfoil curves of the front and back sections of the blade 201 are shown in Table 1.

Table 1

The two fitted curves are expressed as:

Front of the leaf:

y= ^5.90536 × ^10-9x4 + ^7.85472 × ^{10-7x3 +} 0.00433x2-0.64408x-74.91562

The reverse side of the blade:

y=0.00453x2-0.64346x ^- 80.21352

30mm from the top of the impeller 2, the values of the point coordinates on the airfoil curves of the front and back sections of the blade 201 are shown in Table 2.

Table 2

The two fitted curves are expressed as:

Front of the leaf:

y= ^8.51429 × ^{10-8x4-3.24432 × 10-5x3 +} 0.00898x2-0.85396x-76.80993

The reverse side of the blade:

y= ^1.21106 × ^{10-7x4-4.41294 × 10-5x3 +} 0.00984x2-0.84698x-82.60417

45mm from the top of the impeller 2, the values of the point coordinates on the airfoil curves of the front and back sections of the blade 201 are shown in Table 3.

table 3

The two fitted curves are expressed as:

Front of the leaf:

y= ^1.67549 × ^{10-7x4-6.09372 × 10-5x3 +} 0.01191x2-0.89008x-83.98501

The reverse side of the blade:

y= ^2.04153 × ^{10-7x4-7.03872 × 10-5x3 +} 0.01219x2-0.84686x-89.92346

60mm from the top of the impeller 2, the values of the point coordinates on the airfoil curves of the front and back sections of the blade 201 are shown in Table 4.

Table 4

The two fitted curves are expressed as:

Front of the leaf:

y = -3.13326×10 ^-9 x ⁵ +1.28277×10 ^-6 x ⁴ -1.83507×10 ^-4 x ³ +0.01513x ² -0.72108x-94.5626

The reverse side of the blade:

y=-2.59883×10 ^-9 x ⁵ +1.0539×10 ^-6 x ⁴ -1.49816×10 ^-4 x ³ +0.01292x ² -0.65976x-99.19258

75mm from the top of the impeller 2, the values of the point coordinates on the airfoil curves of the front and back sections of the blade 201 are shown in Table 5.

table 5

The two fitted curves are expressed as:

Front of the leaf:

y=4.34299×10 ^-7 x ⁴ -1.02267×10 ^-4 x ³ +0.01166x ² -0.60009x-103.24091

The reverse side of the blade:

y= ^4.25496 × ^{10-7x4-9.34081 × 10-5x3 +} 0.01042x2-0.55726x-107.43066

90mm from the top of the impeller 2, the values of the point coordinates on the airfoil curves of the front and back sections of the blade 201 are shown in Table 6.

Table 6

The two fitted curves are expressed as:

Front of the leaf:

y= ^7.16724 × ^{10-7x4-9.78411 × 10-5x3 +} 0.00819x2-0.44165x-112.25216

The reverse side of the blade:

y= ^1.02502 × ^{10-6x4-9.44505 × 10-5x3 +} 0.00641x2-0.42197x-116.02084

105mm from the top of the impeller 2, the values of the point coordinates on the airfoil curves of the front and back sections of the blade 201 are shown in Table 7.

Table 7

The two fitted curves are expressed as:

Front of the leaf:

y= ^1.62071 × ^{10-6x4-6.59471 × 10-6x3 +} 0.0056x2-0.42675x-123.5046

The reverse side of the blade:

y=2.94938×10 ^-6 x ⁴ +9.18226×10 ^-5 x ³ +0.00611x ² -0.44197x-128.2289

The center of the suction pipe 1, the impeller 2, the deflector 3 and the double outlet volute 4 are on the same axis. The double outlet volute 4 has two water outlets in the circumferential direction, and the two water outlets are in the center. Symmetrical settings.

The number of blades 201 of the impeller 2 is 4-8.

Example 1:

The optimized design of a pump is carried out. The design head of the pump is 49m, the design flow rate is 435m ³ /h, and the specific speed is 137.

As shown in Figures 5-6, the optimized parameters of the present invention are: the diameter of the inlet at the bottom of the impeller is 260 mm, the diameter of the outlet at the top of the impeller is 360 mm, the number of blades of the impeller is 5, and the blades of the impeller adopt a backward curved non-equal thickness twisted structure , the backbend angle is 40°. Eight deflectors are set at the water inlet of the volute. The water outlet section of the double outlet volute is a circular section with a diameter of 350mm, which is directly connected to the water outlet pipe.

Example 2:

The specific application process of the present invention is as follows: the pump body and the water suction pipe 1 are filled with water first, the motor drives the impeller 2 to rotate, the water between the blades in the impeller starts to rotate, and the water is thrown from the center of the impeller 2 to the outer edge of the impeller, and at a higher The pressure is discharged from the two water outlets. At the same time, due to the pressure difference, the impeller 2 keeps rotating, and the liquid also continuously enters from the suction pipe 1 and flows out from the two water outlets through the double outlet volute 4.

The descriptions not involved in the specific embodiments of the present invention belong to the well-known technology in the art, and can be implemented with reference to the well-known technology.

The above is only the preferred embodiment of the present invention, it should be pointed out that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims (7)

1. a middle specific speed double outlet volute pump, it is characterized in that: comprising: double outlet volute, the inner annular opening of the double outlet volute is provided with a circle of baffles, the inner annular opening of the double outlet volute is An impeller is sleeved at the opening, and the bottom of the impeller is connected with one end of the water suction pipe; the blades in the impeller adopt a backward-curved structure, the water inlet edge of the blade extends to the opening at the bottom of the impeller, and the front and back of the blade are from top to bottom. Surfaces with different curvatures are smoothly connected. 2 . The medium specific speed double outlet volute pump according to claim 1 , wherein the centers of the suction pipe, the impeller, the baffle and the double outlet volute are on the same axis. 3 . 3 . The medium specific speed double outlet volute pump according to claim 1 , wherein the blade backward bending angle θ is set to 35°-45°. 4 . 4 . The medium specific speed double outlet volute pump according to claim 1 , wherein the double outlet volute has two water outlets in the circumferential direction. 5 . 5 . The medium specific speed double outlet volute pump according to claim 4 , wherein the two water outlets are arranged symmetrically in the center. 6 . 6 . The medium specific speed double outlet volute pump according to claim 1 , wherein the number of blades of the impeller is 4-8. 7 . 7. A kind of middle specific speed double outlet volute pump according to claim 1, it is characterized in that: the cross-sectional airfoil curve of the curved surface from top to bottom of the front and back of the blade is set as follows: At a distance of 15mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows: y= ^5.90536 × ^10-9x4 + ^7.85472 × ^{10-7x3 +} 0.00433x2-0.64408x-74.91562 The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows: y=0.00453x2-0.64346x ^- 80.21352 At 30mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows: y=8.51429×10 ^-8 x ⁴ -3.24432×10 ^-5 x ³ +0.00898x ² -0.85396x-76.80993 The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows: y= ^1.21106 × ^{10-7x4-4.41294 × 10-5x3 +} 0.00984x2-0.84698x-82.60417 At a distance of 45mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows: y= ^1.67549 × ^{10-7x4-6.09372 × 10-5x3 +} 0.01191x2-0.89008x-83.98501 The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows: y= ^2.04153 × ^{10-7x4-7.03872 × 10-5x3 +} 0.01219x2-0.84686x-89.92346 At 60mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows: y = -3.13326×10 ^-9 x ⁵ +1.28277×10 ^-6 x ⁴ -1.83507×10 ^-4 x ³ +0.01513x ² -0.72108x-94.5626 The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows: y=-2.59883×10 ^-9 x ⁵ +1.0539×10 ^-6 x ⁴ -1.49816×10 ^-4 x ³ +0.01292x ² -0.65976x-99.19258 At a distance of 75mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows: y= ^4.34299 × ^{10-7x4-1.02267 × 10-4x3 +} 0.01166x2-0.60009x-103.24091 The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows: y= ^4.25496 × ^{10-7x4-9.34081 × 10-5x3 +} 0.01042x2-0.55726x-107.43066 At 90mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows: y= ^7.16724 × ^{10-7x4-9.78411 × 10-5x3 +} 0.00819x2-0.44165x-112.25216 The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows: y= ^1.02502 × ^{10-6x4-9.44505 × 10-5x3 +} 0.00641x2-0.42197x-116.02084 At a distance of 105mm from the top of the impeller, the cross-sectional airfoil curve formula of the curved surface of the blade front is as follows: y= ^1.62071 × ^{10-6x4-6.59471 × 10-6x3 +} 0.0056x2-0.42675x-123.5046 The cross-sectional airfoil curve formula of the curved surface on the opposite side of the blade is as follows: y ^{= 2.94938x10-6x4} + ^{9.18226x10-5x3 + 0.00611x2-0.44197x} -128.2289.

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