CN203348090U - Double-suction conical spinning constant pressure pump - Google Patents

Abstract

The utility model discloses a double-suction cone-rotary constant pressure pump, which comprises a pump casing and an impeller. The pump casing is composed of an upper pump casing and a lower pump casing, and the two ends of the pump casing are open and arranged as two suction pipes. In the middle of the pump casing, there is an outlet pipe of the fastest descending line. The inner wall of the pump casing is conical; the impeller includes a left impeller and a right impeller, and the left and right impellers are positioned and assembled into one body through a connecting device. The impeller is in the shape of a cone, and the left impeller and the right impeller are provided with at least three symmetrically distributed blades, and a motor is connected to a connecting device to provide power for the impeller. Through the two suction nozzles and the impeller, the liquid in the pump chamber produces oblique flow and rotational movement on the inner wall of the pump casing, and produces conical liquid flow. The sucked liquid flows evenly between the blades, and the liquid hits the pump casing. Finally, the returned liquid re-enters the vane, so that the space that has entered the vane many times is boosted, thereby increasing the outlet pressure and head of the pump.

Description

A double-suction cone-rotary constant pressure pump

technical field

The utility model relates to a centrifugal pump, in particular to a double-suction cone-rotary constant-pressure pump.

Background technique

Centrifugal pump is a kind of hydraulic machinery with a wide range of applications, widely used in agriculture, industry, fire protection and other occasions. In recent years, my country's centrifugal pump industry has developed rapidly. Benefiting from the continuous improvement of the production technology of the centrifugal pump industry and the continuous expansion of the downstream demand market, the development situation of the centrifugal pump industry in the domestic and foreign markets is very promising.

At present, the structure of single-stage double-suction centrifugal pump mainly consists of pump casing, double-suction impeller and water absorption chamber. The working principle is that the impeller is installed in the pump casing and fixed on the transmission shaft, which is directly driven by the motor. There is a liquid suction port in the center of the pump casing connected to the suction pipe, the liquid enters the pump through the lower valve and the suction pipe, and the liquid discharge port on the pump casing is connected to the discharge pipe; the main feature is that the flow rate of the transported liquid is large, but the outlet pressure and head smaller.

Therefore, we must propose a double-suction conical rotary constant pressure pump with simple structure and compact interior to solve the problems of low water outlet pressure and small head in the prior art.

Utility model content

In order to overcome the defects of the prior art, the utility model aims to provide a double-suction cone-rotary constant-pressure pump with simple structure, compact interior, and relatively large outlet pressure and head.

In order to achieve the above purpose, the utility model provides a double-suction cone-rotary constant pressure pump, which includes a pump casing and an impeller. The pump casing is composed of an upper pump casing and a lower pump casing. Both ends of the pump casing have circular openings. shape, and are respectively provided with two suction nozzles, the middle of the pump casing is provided with a water outlet nozzle, the inner wall of the pump casing is conical; the impeller includes a left impeller and a right impeller, and the left impeller is connected by a connecting device. The impeller and the right impeller are positioned and assembled into one body, the impeller is conical, and at least 3 blades are arranged on the left impeller and the right impeller; the pump casing and the impeller form an integral structure , to provide power for the impeller through the connecting device.

Preferably, the lower pump casing is provided with an outlet pipe, and the outlet pipe curve of the outlet pipe is designed by the fastest descent line, and the curve equation of the outlet pipe curve in the plane Cartesian coordinate system is x=a(t- sint), y=a(1-cost); wherein, the x is the x-axis under the plane Cartesian coordinate system, the y is the y-axis under the plane Cartesian coordinate system, the a is a constant, and the t is variable in the curve equation.

Preferably, the blades on the left impeller and the right impeller are distributed symmetrically, and the blades are arranged at equal angles on the left and right impellers.

Preferably, the projection line of the blade on the end surface perpendicular to the axis line of the impeller is a Bernoulli double-needle line, and the curve equation of the projection line in the plane Cartesian coordinate system is (x ² +y ² ) ² =2a ² (x ² -y ² ), the x is the x-axis in the plane Cartesian coordinate system, the y is the y-axis in the plane Cartesian coordinate system, and the a is a constant.

Preferably, the rotation angle of the curves of the front side of the blade and the rear side of the blade with respect to the axis of the impeller is 5°-45°.

Preferably, the connection device includes a shaft, a straight pin and a first screw; the left impeller and the right impeller are positioned and transmitted through the straight pin, and the left impeller and the right impeller are connected through the The assembly of the shaft and the parts on the shaft and the first screw fix the left impeller and the right impeller on the shaft.

Preferably, both ends of the pump casing can suck liquid at the same time, and the inner wall of the pump casing has the same size as the conical surface from the outer surface of the vane to the inner wall of the pump casing.

Preferably, the surface roughness Ra of the inner wall of the pump casing and the impeller is 0.2-6.3 microns.

Preferably, the impeller is made of alloy plastic aluminum.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. In this utility model, the pump casing is composed of the upper pump casing and the lower pump casing. The left impeller and the right impeller are positioned and integrated through the shaft, cylindrical pin and the first screw. Driven by the motor, the rotation of the output shaft of the motor drives the rotation of the shaft. Rotating to provide power for the impeller, the double-suction cone-rotary constant pressure pump has a simple structure, convenient processing and manufacturing, and low cost.

2. The double-suction cone-rotary constant pressure pump of the utility model makes the liquid in the pump chamber flow obliquely on the inner wall of the pump casing through the two suction nozzles and the conical impeller at the two ends of the upper and lower pump casings, and at the same time has the ability to rotate Movement, so that conical liquid flow can be generated, so that the inhaled liquid flows into the blades more evenly, and the liquid returned after the liquid hits the pump casing enters the blades again, so that the liquid enters the space in the blades many times and is boosted. As a result, the water outlet pressure of the pump is high, the water output is large, and the lift is large.

3. The double-suction cone-rotary constant pressure pump of the present utility model adopts the design of the outlet channel of the conical surface, double-button blades and the fastest-falling line, so that the outlet pressure and speed have been further improved, and through this design, the The constant pressure pump is more stable in operation and can be applied to various occasions.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the utility model double-suction conical rotary constant pressure pump;

Figure 2 is a schematic diagram of the assembly structure of the pump casing of the double-suction conical rotary constant pressure pump of the present invention;

Fig. 3 is a schematic diagram of the internal assembly structure of the impeller of the double-suction conical rotary constant pressure pump of the present invention;

Fig. 4 is a schematic diagram of the projection of the blade end face of the double-suction conical rotary constant pressure pump of the present invention;

Figure 5 is a schematic diagram of the internal structure of the left impeller of the double-suction conical rotary constant pressure pump of the present invention;

Fig. 6 is a schematic diagram of the internal structure of the right impeller of the double-suction conical rotary constant pressure pump of the present invention.

List of symbols:

10-impeller, 11-left impeller, 12-right impeller, 13-straight pin, 14-shaft, 15-first screw, 16-blade, 20-upper pump casing, 30-lower pump casing, 31-water outlet , 40-base, 50-end cover connecting frame, 51-second screw, 60-motor, 70-coupling, 80-bearing, 90-sealing ring, 100-nut, A-left suction nozzle, B- Right suction nozzle.

Detailed ways:

Referring to the accompanying drawings showing embodiments of the present invention, the present invention will be described in more detail below. However, the present invention may be realized in different forms, specifications, etc., and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are presented so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to as many as possible in the art. In the drawings, relative sizes may be exaggerated or reduced for clarity.

Now refer to Fig. 1 to describe in detail the double-suction cone-rotary constant pressure pump implemented according to the utility model. The double-suction cone-rotary constant pressure pump includes a pump casing and an impeller. The pump casing is composed of an upper pump casing and a lower pump casing. The upper pump casing It is connected with the lower pump casing to form a whole. The two ends are circular openings and are respectively provided with a left suction nozzle and a right suction nozzle. There is a water outlet nozzle in the middle of the pump casing. The inner wall of the pump casing is conical. The inner wall of the pump casing is The inner wall of the conical pump casing is formed by rotating the double-sided symmetrical oblique line tangent to the arc R1 around the axis of the pump casing; the impeller includes a left impeller and a right impeller, and the left and right impellers are positioned and assembled through a connecting device Integrate, the impeller is in the shape of a cone, and the left impeller and the right impeller are provided with at least 3 blades; the impeller is powered by the connecting device.

Specifically, in the pump chamber composed of the upper pump casing and the lower pump casing, the symmetrical tapered oblique lines on both sides of the casing around the pump casing are in the plane Cartesian coordinate system, and the oblique lines on the upper side are the same as those shown in Figure 1. The arc R1 shown is tangentially rotated one circle around the axis of the pump casing to form the inner wall of the pump casing so that the inner wall of the pump casing is conical.

Among them, the outlet pipe is set in the lower pump casing, and the outlet pipe curve of the outlet pipe is the fastest descending line, and the curve equation in the plane Cartesian coordinate system is x=a(t-sint), y=a(1-cost) ; Wherein, x is the x-axis under the plane Cartesian coordinate system, y is the y-axis under the plane Cartesian coordinate system, a is a constant, and t is the variable in the curve equation; Symmetrically distributed, and the projection line of the blade on the end face perpendicular to the axis line of the impeller is a Bernoulli double-neck line, and the curve equation of the projection line in the plane Cartesian coordinate system is (x ² +y ² ) ² = 2a ² (x ² -y ² ); wherein, x is the x-axis in the plane Cartesian coordinate system, y is the y-axis in the plane Cartesian coordinate system, and a is a constant. The rotation angle of the curves of the front side of the blade and the rear side of the blade with respect to the axis line of the impeller is 5°-45°.

Moreover, the connecting device includes a shaft, a straight pin and a first screw, and the left impeller and the right impeller are positioned and transmitted through the straight pin, and the left impeller and the right impeller are connected to the left impeller through the assembly of the shaft and the parts on the shaft and the first screw. And the right impeller is fixed on the shaft. Both ends of the pump casing can suck liquid at the same time, and the size between the inner wall of the pump casing and the conical surface from the outer surface of the blade to the inner wall of the pump casing is consistent, and the surface roughness values of the inner wall of the pump casing and the impeller are both 0.2-6.3 microns .

Use case

As shown in Figure 1, the double-suction cone-rotary constant pressure pump provided by the utility model includes a pump casing composed of an upper pump casing 20 and a lower pump casing 30, an impeller 10, and an end cover connecting frame 50. And the motor 60, the upper pump casing 20 and the lower pump casing 30 are respectively connected to the end cover connecting frame 50, fastened by the second screw 51, and positioned with pins; wherein, the motor 60 is fixedly installed on the end cover connecting frame 50 At the rear end, the impeller 10 includes two impellers, that is, the two impellers are connected and combined into a whole through a connecting device, and are in the shape of a cone. The impeller 10 is provided with at least three blades 16, and the output shaft of the motor 50 is connected through a coupling. The shaft device 70 is connected with the connecting device of the impeller 10, so that the power is transmitted to the impeller 10 through the output shaft of the motor 50. The opening on the right side is respectively provided with a left suction nozzle A and a right suction nozzle B with horizontal liquid, and there is a water outlet nozzle 31 formed with a specific curve in the middle of the pump casing; both ends of the pump casing can suck liquid at the same time, and The inner wall of the pump casing is consistent with the dimension between the outer surface of the vane and the conical surface of the inner wall of the pump casing. The pump casing, impeller 10, motor 60 and end cover connecting frame 50 form an integral structure, and the double-suction conical rotary constant pressure pump is placed and installed on a base 40, and the rotation of the motor 60 provides power for the impeller 10.

As shown in Figure 2, the water outlet pipe mouth 31 is arranged on the lower pump casing 30, and through the design of the fastest descending line, so that the curve of the outlet pipe is the fastest descending line, and the curve equation of the outlet pipe curve in the plane Cartesian coordinate system is: x=a(t-sint), y=a(1-cost); and the surface roughness value Ra of the pump casing and impeller is 0.2-6.3 microns, and the impeller is made of alloy plastic aluminum as raw material, and through high-precision numerical control The machine tool processes the impeller to obtain good surface roughness and dynamic balance of the impeller.

As shown in Fig. 3 and Fig. 4, this impeller 10 comprises left impeller 11 and right impeller 12, and left impeller 11 and right impeller 12 are all provided with at least 3 blades 16, and blade 16 is all symmetrically distributed, and this blade 16 is vertically The end surface projection line of the shaft center line of the impeller 10 is designed by Bernoulli double knot line, so that the end surface projection line is a Bernoulli double knot line, and the curve equation of the projection line under the plane Cartesian coordinate system is (x ² +y ² ) ² =2a ² (x ² -y ² ), based on the characteristics of the Bernoulli double-knuckle itself, in the process of the liquid from sucking in to flowing out of the blade 16, the curvature radius of the blade surface gradually decreases from large to small A gradual change process, so that it is easier to generate a spiral flow in the pump chamber, thereby reducing the resistance of the water flow, and increasing the pressure of the outlet pipe 31; The angle of line rotation is 5°-45°. The left impeller 11 and the right impeller 12 are connected to form a whole through a connecting device including a shaft 14, a screw 15, and a cylindrical pin 13. Specifically, the left impeller 11 and the right impeller 12 are positioned and transmitted by a cylindrical pin 13, And the left impeller 11 and the right impeller 12 are fixed on the shaft 14 through the assembly of the shaft 14 and the parts on the shaft and the first screw 15 .

Moreover, the output shaft of the motor 60 is connected to the shaft 14 through a coupling 70 , and is fixedly connected to the shaft 14 through a bearing 80 and a nut 100 , and a sealing ring is provided between the bearing 80 and the shaft 14 . The rotation of the output shaft drives the rotation of the shaft 14, thereby transmitting power to the impeller 10, and the shaft 14 is positioned according to the assembly relationship between the bearing 80 and the end cover connecting frame 50, and is tightened by the adjusting nut 100; the upper pump casing 20 It is integrally connected with the lower pump casing 30 by means of pin positioning and screw fastening, thereby forming a chamber of the pump, that is, a pump chamber.

The double-suction conical-rotary constant-pressure pump provided by the utility model rotates with each other through the left and right impellers designed by the Bernoulli double-button line, and through the pump casing with the horizontal liquid suction nozzle at both ends and the outlet pipe designed by the fastest descending line On the one hand, it can make the liquid in the pump chamber flow obliquely on the inner wall of the pump casing, and at the same time, it has rotational movement, thereby generating conical liquid flow, so that the sucked liquid flows into the blades more evenly, and the liquid hits the pump casing The returned liquid re-enters the blade again, and the liquid flow enters the space in the blade for many times to be boosted; on the other hand, the utility model adopts the design of the outlet pipe of the cone surface, double-button blade and the fastest descending line, so that the outlet water pressure and The water outlet speed is further improved. Therefore, the double-suction conical rotary constant pressure pump solves the problems of low pressure and small head of the existing double-suction centrifugal pump, and the pump has a simple structure, convenient processing and manufacturing, and the pump has a large water flow, high pressure, and large growth. , Stable operation, can be applied to many occasions, and has good practicability.

In addition, the material selection of the pump casing and impeller proposed in this utility model is not limited to the alloy plastic aluminum proposed in this embodiment, and other materials can be used to obtain good surface roughness and dynamic balance under the processing of high-precision CNC machine tools In this embodiment, at least 3 blades or more than 3 blades are usually selected on the impeller, so as to satisfy the stability of the blades and keep the pump running smoothly; The a in the curve equation under the system is a constant, which can be determined according to the actual situation. The value of x and y is a coordinate value in the plane Cartesian coordinate system, and the variable t is the change between 0-1 in the curve parameter equation amount; and the connecting device of the left and right impellers is not limited to the shaft, cylindrical pin and screw proposed in this embodiment, the left and right impellers can also be formed into a whole impeller through other connecting devices, and provide power for the impeller.

Apparently, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications. the

Claims (9)

1. a double suction coning constant pressure pump, comprise pump case and impeller, it is characterized in that,

Described pump case is comprised of upper pump case and lower pump case, the rounded opening shape in described pump case two ends, and be respectively arranged with two inlet tube mouths, and being provided with effluent pipe mouth in the middle of described pump case, described pump housing endophragm is conical;

Described impeller comprises lobus sinister wheel and lobus dexter wheel, by a connection set, one is located and be assembled into to described lobus sinister wheel and described lobus dexter wheel, the tapered body of described impeller, and be provided with at least 3 blades on described lobus sinister wheel and described lobus dexter wheel;

Described pump case and described impeller form monolithic construction, by described connection set, for described impeller, provide power.

2. double suction coning constant pressure pump according to claim 1, it is characterized in that, described lower pump case is provided with effluent pipe mouth, the outlet conduit curve of described effluent pipe mouth is brachistochrone, and the curvilinear equation of this outlet conduit curve under plane right-angle coordinate is x=a (t-sint), y=a (1-cost); Wherein, described x is the x axle under plane right-angle coordinate, and described y is the y axle under plane right-angle coordinate, and described a is constant, and described t is the variable in curvilinear equation.

3. double suction coning constant pressure pump according to claim 1, is characterized in that, the blade on described lobus sinister wheel and described lobus dexter wheel is symmetrical.

4. double suction coning constant pressure pump according to claim 3, is characterized in that, described blade is Bernoulli's lemniscate at the end on projection line of the shaft axis perpendicular to described impeller, and the curvilinear equation of this projection line under plane right-angle coordinate is (x ²+ y ²) ²=2a ²(x ²-y ²); Wherein, described x is the x axle under plane right-angle coordinate, and described y is the y axle under plane right-angle coordinate, and described a is constant.

5. double suction coning constant pressure pump according to claim 4, is characterized in that, the curve of the front side of described blade and the rear side of described blade is 5 °-45 ° about the angle of the shaft axis rotation of described impeller.

6. double suction coning constant pressure pump according to claim 1, is characterized in that, described connection set comprises axle, straight pin and the first screw; Between described lobus sinister wheel and described lobus dexter wheel, by described straight pin location transferring power, described lobus sinister wheel and described lobus dexter wheel are fixed on described lobus sinister wheel and described lobus dexter wheel on described axle by assembling and described first screw of described axle and parts on shaft.

7. double suction coning constant pressure pump according to claim 1, is characterized in that, described pump case two ends all can suck liquid simultaneously, and described pump housing endophragm and described blade outer surface are to the consistent size between the conical surface of pump housing endophragm.

8. double suction coning constant pressure pump according to claim 7, is characterized in that, the surface roughness value Ra of described pump housing endophragm and described impeller is the 0.2-6.3 micron.

9. double suction coning constant pressure pump according to claim 8, is characterized in that, the material of described impeller is that alloy is moulded aluminium.

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