Supercharged centrifugal pump

Abstract

The invention provides a booster centrifugal pump, and belongs to the technical field of centrifugal pumps. The lift of the centrifugal pump adopting the single-stage impeller is improved. A booster centrifugal pump comprises a volute and an impeller, the volute comprises a suction end and a discharge end, the impeller is located at the discharge end of the volute, and the booster centrifugal pump is characterized in that a plurality of flow guide blades capable of dividing flow are arranged on the outer side of the impeller in the circumferential direction, and the impeller can rotate relative to the flow guide blades; each guide vane can be matched with the inner wall of the volute to form a pressurization channel, and the discharge end and the suction end can be communicated through the pressurization channel. And the acting chamber at the discharge end is communicated with the transmission chamber through the pressurizing channel and is shunted through the guide vanes, and the flow enters the transmission chamber along with the pressurizing channel and finally returns to the acting chamber, so that the lift of the single-stage impeller is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal pumps, and in particular relates to a booster centrifugal pump. Background Art

[0002] As a common liquid conveying equipment, centrifugal pumps are widely used in agricultural irrigation, urban water supply and drainage and other fields. They include impellers, volutes, pump shafts and other key components. The impeller is mainly driven by a motor to rotate at high speed in the space surrounded by the volute, thereby forcing the liquid between the blades to rotate. Under the action of inertial centrifugal force, the liquid moves radially from the center of the impeller to the periphery, and then is thrown out of the centrifugal pump and directed to the discharge pipeline. When the liquid enters from the inlet to the outlet, the flow rate and pressure of the liquid will further increase under the action of the impeller and centrifugal force, thereby increasing the head of the centrifugal pump during use. However, common centrifugal pumps usually use a single-stage pump body with low efficiency.

[0003] To solve the above problems, the prior art provides a multi-stage impeller structure for a centrifugal pump, in which multi-stage impellers are arranged on a rotating shaft to form an integral structure connected end to end, so that the water flow is thrown by the impeller into the guide plate of the previous impeller and then enters the guide plate of the next impeller through the rotation of the impeller to increase the flow rate and pressure. An impeller retaining ring is added between each stage of impellers, so that after the previous impeller is sucked in, there will not be too much energy loss when it passes to the next stage. Although the work efficiency is improved, the multi-stage impeller is large in size and requires a large area for installation and operation. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to propose a booster centrifugal pump. The technical problem to be solved by the present invention is: how to improve the head of a single-stage impeller centrifugal pump.

[0005] The objective of the present invention can be achieved through the following technical solutions: a boosting centrifugal pump, comprising a volute and an impeller, the volute comprising a suction end and a discharge end, the impeller being located at the discharge end of the volute, and characterized in that a plurality of guide vanes capable of diverting flow are circumferentially arranged on the outer side of the impeller, the impeller being able to rotate relative to the guide vanes, each of the guide vanes being able to cooperate with the inner wall of the volute to form a boosting channel, and the discharge end and the suction end being able to be connected through the boosting channel.

[0006] The present application mainly drives the impeller located in the volute to rotate by a motor, thereby driving the liquid in the volute to rotate together, generating centrifugal force, and under the action of the centrifugal force, the liquid is thrown out along the flow path of the blades on the impeller. Among them, the present application is based on the existing centrifugal pump, by setting a number of guide vanes on the periphery of the impeller, and the guide vanes are used to divert the liquid that enters the discharge end under the influence of the impeller, so that part of the liquid enters the boost channel under the influence of the guide vanes during the rotation of the impeller, and enters the suction end through the boost channel, and enters the discharge end with the impeller together with the liquid that just entered from the suction end. Part of the liquid is discharged under the action of centrifugal force, and the other part is diverted by the guide vanes and the previous steps are repeated. Among them, in terms of the relative rotation of the impeller and the guide vanes, that is, the impeller rotates, which is different from the static impeller.

[0007] It is worth mentioning that, based on the acceleration and pressurization of the impeller of the existing centrifugal pump, which makes the internal pressure and flow rate at the discharge end higher than those at the suction end, the present application diverts the liquid through the guide vanes after the liquid enters the discharge end under the influence of the impeller, and enters the pressurization channel, and pressurizes the diverted liquid through the pressurization channel, and then enters the liquid that has just entered the volute at the suction end to increase the liquid pressure and flow rate at the suction end, and under the influence of the impeller and the volute, the flow rate and pressure are further increased, and then, when a single-stage impeller is used, multiple pressurizations of the liquid are completed, thereby improving the head of the single-stage impeller centrifugal pump.

[0008] In addition, the present application further improves the pressurization effect and increases the head of the single-stage impeller centrifugal pump by arranging a plurality of guide vanes outside the impeller and cooperating with the inner wall of the volute to form a plurality of pressurization channels.

[0009] In the above-mentioned boosting centrifugal pump, the plurality of guide vanes are evenly fixed in the volute in the circumferential direction and cooperate with the inner wall of the volute to form a boosting channel. By evenly arranging the guide vanes, a stable boosting effect is ensured.

[0010] In the above-mentioned boosting centrifugal pump, an inclined plate is connected between the guide vane and the inner wall of the volute, and the inclined plate is used to prevent the liquid from directly entering the discharge end through the boosting channel. By arranging the inclined plate between the guide vane and the volute, the liquid that has just entered the suction end is prevented from directly entering the discharge end through the boosting channel and affecting the pressure at the discharge end.

[0011] In the above-mentioned boosting centrifugal pump, the boosting channel includes a primary boosting channel and a secondary boosting channel, wherein the primary boosting channel is formed by the cooperation of two adjacent guide vanes, and the secondary boosting channel is formed by the cooperation of the guide vanes, the inclined plate and the inner wall of the volute. The primary boosting channel and the secondary boosting channel are formed by the cooperation of the two adjacent guide vanes and the inclined plate with the volute and the guide vanes, thereby completing the boosting of the liquid after the diversion and improving the influence of the single-stage pressure on it.

[0012] In the above-mentioned booster centrifugal pump, a filter screen is provided on the top cover of the discharge end.

[0013] In the above-mentioned booster centrifugal pump, a water inlet cylinder is provided below the volute, and a motor is provided inside the water inlet cylinder, and the motor is used to drive the impeller to rotate.

[0014] In the above-mentioned submersible pump high motor, the volute includes a cover body, and the guide vanes are fixed on the cover body and are evenly arranged on the outer side of the impeller in the circumferential direction.

[0015] In the above-mentioned booster centrifugal pump, the guide vanes on the cover body surround the discharge end to form a working chamber, the shell of the volute cooperates with the cover body to form a conveying chamber, and the conveying chamber is connected to the working chamber through a booster channel.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The present application forms a boosting channel by arranging guide vanes and inclined plates under the cover of the volute. Since a working chamber is formed by a plurality of guide vanes on the discharge end, while the impeller drives the liquid therein to rotate, part of the liquid enters the delivery chamber through the boosting channel along with the guide vanes, and through the spatial changes of the first-level boosting channel and the second-level boosting channel in the boosting channel, the pressurization of the diverted liquid is completed, and the liquid re-enters the working chamber with the liquid in the delivery chamber to increase the overall flow rate and pressure of the liquid, thereby increasing the head of the single-stage impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of this embodiment; Figure 2 is a cross-sectional schematic diagram of this embodiment; Figure 3 1 is an exploded perspective view of the volute portion of the present embodiment; Figure 4 1 is a cross-sectional perspective schematic diagram of the volute of this embodiment; Figure 5 It is a top view schematic cross-sectional view of the volute portion of this embodiment.

[0018] In the figure, 1, volute; 1a, shell; 1a1, suction end; 1b, cover; 1b1, discharge end; 1b2, guide vane; 1b3, inclined plate; 1b4, impeller; 1c, working chamber; 1d, transmission chamber; 2, water inlet cylinder; 3, water inlet; 4, filter screen; 5, motor; 6, boosting channel; 6a, primary boosting channel; 6b, secondary boosting channel; DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0020] like Figure 1 as well as Figure 2 As shown, a booster centrifugal pump includes a volute 1, a water inlet cylinder 2 and a water inlet 3, which are arranged in sequence from top to bottom, wherein a drive motor 5 is provided in the water inlet cylinder 2, and the drive motor 5 passes through the volute 1 and is connected to an impeller 1b4, the volute 1 includes a suction end 1a1 and a discharge end 1b1, the suction end 1a1 is communicated with a chamber in the water inlet cylinder 2, and the impeller 1b4 is located in the discharge end 1b1, in addition, the discharge end 1b1 of the volute 1 is also covered with a filter screen 4, and the output shaft of the drive motor 5 is connected to the impeller 1b4.

[0021] In addition, if Figure 2 and Figure 3 As shown, the volute 1 includes a cover body 1b and a shell 1a, a guide vane 1b2 is provided in the cover body 1b, the inner side of the guide vane 1b2 cooperates with the impeller 1b4 to form a working chamber 1c, and the cover body 1b is covered at the opening at the upper end of the shell 1a, and cooperates with the spiral plane in the shell 1a to form a conveying chamber, wherein the guide vane 1b2 is connected to the inner wall of the cover body 1b through the inclined plate 1b3, and the working chamber 1c can be connected to the transmission chamber 1d, wherein there is a certain gap between the impeller 1b4 and the guide vane 1b2 for liquid to flow in.

[0022] Among them, Figure 4 and Figure 5 As shown, there are several guide blades 1b2, and they are circumferentially arranged along the rotation direction of the impeller 1b4, wherein a certain gap is left between the guide blades 1b2 and the inner wall of the cover body 1b of the volute 1, and the guide blades 1b2 are integrally fixedly connected to the inner wall of the cover body 1b through the inclined plate 1b3, the guide blades 1b2 and the inner wall of the volute 1 are arranged vertically and parallel, and the inclined plate 1b3 is relatively inclined relative to the guide blades 1b2 and the inner wall of the volute 1, following the direction of liquid flow.

[0023] More importantly, two adjacent guide blades 1b2 and the guide blades 1b2 cooperate with the inner wall of the volute 1 to form a boosting channel 6, and the working chamber 1c of the discharge end 1b1 and the transmission chamber 1d of the suction end 1a1 are connected through the boosting channel 6. Figure 4 as well as Figure 5 As shown, there is a certain gap between two adjacent guide blades 1b2 to form a primary boost channel 6a, and the two adjacent guide blades 1b2 cooperate with the inclined plate 1b3 to form a secondary boost channel 6b, and the primary boost channel 6a is connected to the secondary boost channel 6b.

[0024] It is worth mentioning that Figure 5As shown, a plurality of inclined plates 1b3 and guide vanes 1b2 are uniformly arranged along the circumference of the impeller 1b4 with the impeller 1b4 as the center, wherein the number of inclined plates 1b3 and guide vanes 1b2 corresponds one to one.

[0025] In summary, the existing volute 1 type centrifugal pump drives the motor 5 to make the impeller 1b4 rotate at high speed, thereby driving the liquid to generate centrifugal force, so that the suction end 1a1 generates negative pressure, which is convenient for sucking the liquid entering the water inlet cylinder 2 from the water inlet 3 and pushing it into the volute 1, and discharges it from the discharge end 1b1 with the high-speed rotation of the impeller 1b4. In this process, the internal pressure of the liquid gradually increases, thereby converting the mechanical energy of the transmission shaft into the hydraulic energy of the liquid to realize the transmission of the liquid, but it is affected by the installation volume and the space occupied in the use environment. Due to certain limitations on the area, a single-stage centrifugal pump can only complete one pressurization through the rotation of the impeller 1b4, and then discharge it. Compared with a larger centrifugal pump with a multi-stage impeller 1b4, the head that a single-stage centrifugal pump can achieve is lower. For this reason, the present application is based on the existing centrifugal pump with a single-stage impeller 1b4, and a plurality of guide vanes 1b2 and inclined plates 1b3 are arranged on the inner side wall of the cover body 1b of the volute 1, and the plurality of guide vanes 1b2 and inclined plates 1b3 are evenly arranged around the impeller 1b4, and the adjacent two There is a certain distance between the guide vane 1b2 and the inclined plate 1b3, and they cooperate with the inner wall of the cover body 1b to form a boosting channel 6. After the impeller 1b4 rotates to drive the liquid from the transmission space in the volute 1 into the working chamber 1c where the impeller 1b4 is located, part of the liquid enters the primary boosting channel 6a in the boosting channel 6 through the guide vane 1b2 under the action of centrifugal inertia, and enters the secondary boosting channel 6b connected to the primary boosting channel 6a, and then enters the transmission chamber 1d. The liquid pressure in the transmission chamber 1d is lower than the liquid pressure in the working chamber 1c. After being diverted by the guide vane 1b2, the diverted liquid is pressurized by the first-stage boosting chamber and the second-stage boosting chamber. After merging into the liquid in the transmission chamber 1d, the amount of liquid in the transmission chamber 1d with a rated volume increases, thereby completing the three-stage boosting. After completing the three-stage boosting, the liquid enters the working chamber 1c from the transmission chamber 1d. Under the action of inertia, another part of the liquid is discharged from the discharge end 1b1.

[0026] Compared with the prior art, the present application, based on a single-stage impeller 1b4, connects the working chamber 1c where the impeller 1b4 is located with the transmission chamber 1d for pushing the liquid through a multi-stage boosting chamber composed of a guide vane 1b2 and an inclined plate 1b3, so that the centrifugal pump of the single-stage impeller 1b4 has a multi-stage boosting function.

[0027] It is worth mentioning that both the primary boosting channel 6a and the secondary boosting channel 6b in the boosting channel 6 are pressurized by reducing the liquid flow cross-section. Specifically, the primary boosting channel 6a is formed by the cooperation of two adjacent guide blades 1b2, and mainly limits the flow rate of the diverted liquid through the minimum gap between the two adjacent guide blades 1b2, thereby completing the initial pressurization of the diverted part of the liquid. The secondary boosting channel 6b is formed by the cooperation of two adjacent guide blades 1b2 and the inclined plate 1b3, and increases the liquid pressure by cooperating with the inner wall of the volute 1.

[0028] In addition, the guide vane 1b2 is connected to the volute 1 through the inclined plate 1b3, and the inclined plate 1b3 is arranged between the volute 1 and the guide vane 1b2, and above the transmission chamber 1d, so as to block part of the liquid entering the transmission chamber 1d, thereby preventing the above-mentioned liquid from directly entering the working chamber 1c through the boosting channel 6, and a filter screen 4 is provided on the discharge end 1b1, and the liquid pumped out of the volute 1 is filtered through the filter screen 4.

[0029] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0030] Although the terms 1, volute; 1a, shell; 1a1, suction end; 1b, cover; 1b1, discharge end; 1b2, guide vane; 1b3, inclined plate; 1b4, impeller; 1c, working chamber; 1d, transmission chamber; 2, water inlet cylinder; 3, water inlet; 4, filter screen; 5, motor; 6, boosting channel; 6a, primary boosting channel; 6b, secondary boosting channel are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A booster centrifugal pump, comprising a volute (1) and an impeller (1b4), wherein the volute (1) comprises a suction end (1a1) and a discharge end (1b1), and the impeller (1b4) is located at the discharge end (1b1) of the volute (1), characterized in that: A plurality of guide vanes (1b2) capable of diverting flow are arranged on the outer circumference of the impeller (1b4); the impeller (1b4) can rotate relative to the guide vanes (1b2); each of the guide vanes (1b2) can cooperate with the inner wall of the volute (1) to form a pressurizing channel (6); and the discharge end (1b1) and the suction end (1a1) can be connected via the pressurizing channel (6).

2. The booster centrifugal pump according to claim 1, characterized in that: The plurality of guide blades (1b2) are evenly fixed in the volute (1) in the circumferential direction, and cooperate with the inner wall of the volute (1) to form a pressure boosting channel (6).

3. The booster centrifugal pump according to claim 2, characterized in that: An inclined plate (1b3) is connected between the guide vane (1b2) and the inner wall of the volute (1), and the inclined plate (1b3) is used to prevent liquid from directly entering the discharge end (1b1) through the boosting channel (6).

4. The booster centrifugal pump according to claim 3, characterized in that: The boost channel (6) comprises a primary boost channel (6a) and a secondary boost channel (6b); the primary boost channel (6a) is formed by the cooperation of two adjacent guide vanes (1b2); and the secondary boost channel (6b) is formed by the cooperation of the guide vanes (1b2), the inclined plate (1b3) and the inner wall of the volute (1).

5. The booster centrifugal pump according to any one of claims 1 to 4, characterized in that: The top cover of the discharge end (1b1) is provided with a filter screen (4).

6. The booster centrifugal pump according to claim 5, characterized in that: A water inlet cylinder (2) is provided below the volute (1), and a motor (5) is provided inside the water inlet cylinder (2). The motor (5) is used to drive the impeller (1b4) to rotate.

7. The booster centrifugal pump according to claim 6, characterized in that: The volute (1) comprises a cover body, and the guide vanes (1b2) are fixed on the cover body and are evenly arranged circumferentially on the outside of the impeller (1b4).

8. The booster centrifugal pump according to claim 7, characterized in that: The plurality of guide vanes (1b2) on the cover body enclose the discharge end (1b1) to form a working chamber (1c); the shell of the volute (1) cooperates with the cover body to form a transmission chamber (1d); and the transmission chamber (1d) is connected to the working chamber (1c) via a pressurizing channel (6).

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