A booster centrifugal pump

Abstract

The present invention provides a booster centrifugal pump, belonging to the technical field of centrifugal pumps. It solves the problem of how to increase the head of a centrifugal pump with a single-stage impeller. A booster centrifugal pump includes a volute and an impeller. The volute includes a suction end and a discharge end. The impeller is located at the discharge end of the volute. It is characterized in that a plurality of diversion vanes capable of performing flow diversion are circumferentially arranged on the outer side of the impeller. The impeller can rotate relative to the diversion vanes. Each diversion vane can cooperate with the inner wall of the volute to form a pressurization channel. The discharge end and the suction end can be communicated through the pressurization channel. The working chamber at the discharge end and the transmission chamber are communicated through the pressurization channel, and flow diversion is carried out through the diversion vanes. Then it enters the transmission chamber along the pressurization channel and finally returns to the working chamber, thereby increasing the head of the single-stage impeller.

Description

Technical Field

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

[0002] As a common liquid delivery device, a centrifugal pump is widely used in agricultural irrigation, urban water supply and drainage, and other fields. It includes other key components such as an impeller, a volute, and a pump shaft. It mainly drives the impeller to rotate at a high speed in the space surrounded by the volute through an electric motor, and then forces 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 guided to the discharge pipeline. Among them, when the liquid enters from the inlet and is discharged from the outlet, the flow rate and pressure of the liquid will be further increased under the action of the impeller and centrifugal force, thereby increasing the head of the centrifugal pump during use. However, common centrifugal pumps usually adopt a single-stage pump body, resulting in low efficiency.

[0003] To solve the above problems, the prior art provides a multi-stage impeller structure for a centrifugal pump. By arranging multi-stage impellers on the rotating shaft and forming an overall structure connected end to end, the water flow can enter the guide disk of the next-stage impeller through the rotation of the impeller after being thrown by the impeller onto the guide disk of the previous-stage impeller, so as to increase the flow rate and pressure. And by adding impeller retaining rings between each stage of impellers, there will not be too much energy loss when the previous-stage impeller is inhaled and then passes to the next stage. Although the working efficiency is improved, the multi-stage impeller has a large volume and requires a large floor area for installation and operation. Summary of the Invention

[0004] The purpose of the present invention is to provide a booster centrifugal pump in view of the above problems existing in the prior art. The technical problem to be solved by the present invention is: how to increase the head of a centrifugal pump with a single-stage impeller.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A booster centrifugal pump includes a volute and an impeller. The volute includes a suction end and a discharge end. The impeller is located at the discharge end of the volute. It is characterized in that a plurality of diversion vanes capable of performing flow division are circumferentially arranged outside the impeller. The impeller can rotate relative to the diversion vanes. Each diversion vane can cooperate with the inner wall of the volute to form a pressurization channel. The discharge end and the suction end can be connected through the pressurization channel.

[0006] This application mainly drives the impeller located in the volute to rotate through a motor, thereby driving the liquid in the volute to rotate together, generating centrifugal force, and under the action of the centrifugal force, it is discharged along the flow path of the blades on the impeller. Among them, on the basis of the existing centrifugal pump, this application sets several guide vanes on the outer periphery of the impeller, and the guide vanes are used to shunt the liquid affected by the impeller and entering the discharge end, so that part of the liquid is affected by the guide vanes and enters the pressurization channel during the rotation with the impeller, and enters the suction end through the pressurization channel, and enters the discharge end with the impeller together with the liquid just entering from the suction end. Part of the liquid is discharged under the action of centrifugal force, and the other part is shunted by the guide vanes and repeats the previous steps. Among them, in terms of the relative rotation between the impeller and the guide vanes, that is, the impeller rotates and the guide impeller is stationary.

[0007] It is worth mentioning that on the basis that the existing centrifugal pump accelerates and pressurizes the impeller, making the internal pressure and flow rate at the discharge end higher than those at the suction end, after the liquid is affected by the impeller and enters the discharge end, this application shunts it through the guide vanes and enters the pressurization channel. The pressurization channel pressurizes the shunted liquid, and then enters the liquid just entering the volute at the suction end to increase the liquid pressure and flow rate at the suction end. Under the influence of the impeller and the volute, its flow rate and pressure are further increased. Therefore, in the case of using a single-stage impeller, multiple pressurizations of the liquid are completed, and the head of the single-stage impeller centrifugal pump is increased.

[0008] In addition, this application also sets several guide vanes outside the impeller, which cooperate with the inner wall of the volute to form several pressurization channels, further improving the pressurization effect and increasing the head of the single-stage impeller centrifugal pump.

[0009] In the above-mentioned pressurized centrifugal pump, the several guide vanes are circumferentially and uniformly fixed in the volute and cooperate with the inner wall of the volute to form a pressurization channel. By arranging the guide vanes uniformly, the stability of the pressurization effect is ensured.

[0010] In the above-mentioned pressurized 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 pressurization channel. By arranging the inclined plate between the guide vane and the volute, the liquid just entering the suction end is blocked from directly entering the discharge end through the pressurization channel, thus affecting the pressure at the discharge end.

[0011] In the above-mentioned pressurized centrifugal pump, the pressurization channel includes a primary pressurization channel and a secondary pressurization channel. The primary pressurization channel is formed by the cooperation of two adjacent guide vanes, and the secondary pressurization channel is formed by the cooperation of the guide vane, the inclined plate and the inner wall of the volute. Through the cooperation of two adjacent guide vanes and the inclined plate with the volute and the guide vane, a primary pressurization channel and a secondary pressurization channel are formed, thereby completing the pressurization of part of the shunted liquid and enhancing 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 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 in 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 circumferentially and uniformly arranged outside the impeller.

[0015] In the above-mentioned booster centrifugal pump, several guide vanes on the cover body surround the discharge end to form a working chamber, the housing of the volute and the cover body cooperate 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:

[0017] 1. In the present application, by providing guide vanes and inclined plates below the cover body of the volute, a booster channel is formed. Since several guide vanes on the discharge end surround the working chamber, while the impeller drives the liquid inside it to rotate, part of the liquid enters the conveying chamber through the guide vanes and the booster channel, and through the spatial change of the primary booster channel and the secondary booster channel in the booster channel, the pressurization of the split liquid is completed, and it re-enters the working chamber with the liquid in the conveying chamber to increase the overall flow velocity and pressure of the liquid, thereby increasing the head of a single-stage impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall schematic diagram of this embodiment;

[0019] Figure 2 is the cross-sectional schematic diagram of this embodiment;

[0020] Figure 3 is the exploded three-dimensional schematic diagram of the volute part of this embodiment;

[0021] Figure 4 is the cross-sectional three-dimensional schematic diagram of the volute of this embodiment;

[0022] Figure 5 is the top cross-sectional schematic diagram of the volute part of this embodiment.

[0023] In the figure, 1. Volute; 1a. Housing; 1a1. Suction end; 1b. Cover body; 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. Booster channel; 6a. Primary booster channel; 6b. Secondary booster channel; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following are specific embodiments of the present invention, and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0025] As Figure 1 and Figure 2 shown, a booster centrifugal pump includes a volute 1, an inlet barrel 2 and an inlet 3. The volute 1, the inlet barrel 2 and the inlet 3 are arranged in sequence from top to bottom. Among them, a driving motor 5 is arranged in the inlet barrel 2. The driving 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 the chamber in the inlet barrel 2. The impeller 1b4 is located in the discharge end 1b1. In addition, a filter screen 4 is also covered on the discharge end 1b1 of the volute 1. The output shaft of the driving motor 5 is connected to the impeller 1b4.

[0026] In addition, as Figure 2 and Figure 3 shown, the volute 1 includes a cover body 1b and a housing 1a. A guide vane 1b2 is arranged 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 on the opening at the upper end of the housing 1a and cooperates with the spiral plane in the housing 1a to form a conveying chamber. Among them, the guide vane 1b2 is connected to the inner wall of the cover body 1b through an inclined plate 1b3, and enables the working chamber 1c to be communicated with the transmission chamber 1d. Among them, there is a certain gap for liquid to flow in between the impeller 1b4 and the guide vane 1b2.

[0027] Among them, as Figure 4 and Figure 5 shown, there are several guide vanes 1b2, which are circumferentially arranged along the rotation direction of the impeller 1b4. Among them, there is a certain gap between the guide vane 1b2 and the inner side wall of the cover body 1b of the volute 1. And the guide vane 1b2 is integrally and fixedly connected to the inner side wall of the cover body 1b through the inclined plate 1b3. The guide vane 1b2 is vertically parallel to the inner side wall of the volute 1. The inclined plate 1b3 is relatively inclined with respect to the guide vane 1b2 and the inner wall of the volute 1 along the liquid flow direction.

[0028] More importantly, the adjacent two guide vanes 1b2 and the cooperation between the guide vane 1b2 and the inner wall of the volute 1 form a boosting channel 6. The working chamber 1c at the discharge end 1b1 is communicated with the transmission chamber 1d at the suction end 1a1 through the boosting channel 6. As Figure 4 and Figure 5 shown, there is a certain gap between the adjacent two guide vanes 1b2, and a primary boosting channel 6a is formed. And the cooperation between the adjacent two guide vanes 1b2 and the inclined plate 1b3 forms a secondary boosting channel 6b. The primary boosting channel 6a is communicated with the secondary boosting channel 6b.

[0029] It is worth mentioning that, as Figure 5 shown, a plurality of inclined plates 1b3 and guide vanes 1b2 are uniformly arranged circumferentially around the impeller 1b4, and the number of inclined plates 1b3 corresponds to that of the guide vanes 1b2 one by one.

[0030] In summary, for the existing volute 1 type centrifugal pump, the drive motor 5 makes the impeller 1b4 rotate at a high speed, thereby driving the liquid to generate centrifugal force, causing a negative pressure at the suction end 1a1, facilitating the suction of the liquid entering the water inlet cylinder 2 from the water inlet 3 and pushing it into the volute 1, and discharging it from the discharge end 1b1 along with the high-speed rotation of the impeller 1b4. During 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 achieve the transmission of the liquid. However, due to certain limitations of the installation volume and floor area in the use environment, a single-stage centrifugal pump can only complete one stage of pressurization through the rotation of the impeller 1b4 and then discharge it. Compared with a larger centrifugal pump with multiple impellers 1b4, the lift that a single-stage centrifugal pump can achieve is relatively low. Therefore, based on the existing single-stage impeller 1b4 centrifugal pump, the present application is provided with a plurality of guide vanes 1b2 and inclined plates 1b3 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 uniformly arranged circumferentially around the impeller 1b4, and there is a certain distance between two adjacent guide vanes 1b2 and inclined plates 1b3, and they cooperate with the inner wall of the cover body 1b to form a pressurization channel 6. After the liquid is driven by the rotation of the impeller 1b4 to enter the working chamber 1c where the impeller 1b4 is located from the transmission space in the volute 1, part of the liquid, under the action of centrifugal inertia force, enters the primary pressurization channel 6a in the pressurization channel 6 through the guide vane 1b2, and enters the secondary pressurization channel 6b connected thereto along with the primary pressurization channel 6a, and then enters the transmission chamber 1d. Since the liquid pressure in the transmission chamber 1d is lower than the liquid pressure in the working chamber 1c, after the liquid is shunted by the guide vane 1b2, the shunted liquid is pressurized through the primary pressurization chamber and the secondary pressurization chamber. After the liquid flowing into the transmission chamber 1d increases in volume, the liquid in the transmission chamber 1d with a rated volume increases, thereby completing the three-stage pressurization. After completing the three-stage pressurization, it enters the working chamber 1c together with the liquid in the transmission chamber 1d. Under the action of inertia, another part of the liquid is discharged from the discharge end 1b1.

[0031] Compared with the prior art, based on the single-stage impeller 1b4, the present application makes the working chamber 1c where the impeller 1b4 is located communicate with the transmission chamber 1d for pushing the liquid through the multi-stage pressurization chamber composed of the guide vane 1b2 and the inclined plate 1b3, enabling the single-stage impeller 1b4 centrifugal pump to have the function of multi-stage pressurization.

[0032] It is worth mentioning that both the primary pressurization channel 6a and the secondary pressurization channel 6b in the pressurization channel 6 adopt the method of reducing the liquid flow cross-section for pressurization. Specifically, the primary pressurization channel 6a is formed by the cooperation of two adjacent guide vanes 1b2, and mainly restricts the flow rate of the liquid after diversion through the minimum gap between the two adjacent guide vanes 1b2 to complete the preliminary pressurization of the diverted part of the liquid. The secondary pressurization channel 6b is formed by the cooperation of two adjacent guide vanes 1b2 and the inclined plate 1b3, and the liquid pressure is increased by cooperating with the inner wall of the volute 1.

[0033] 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 and prevent the above liquid from directly entering the working chamber 1c through the pressurization channel 6. A filter screen 4 is covered on the discharge end 1b1, and the liquid pumped out of the volute 1 is filtered through the filter screen 4.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although terms such as 1, volute; 1a, housing; 1a1, suction end; 1b, cover; 1b1, discharge end; 1b2, guide impeller; 1b3, inclined plate; 1b4, impeller; 1c, working chamber; 1d, transmission chamber; 2, water inlet tube; 3, water inlet; 4, filter screen; 5, motor; 6, pressurization channel; 6a, primary pressurization channel; 6b, secondary pressurization channel are used more 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 limitation is contrary to the spirit of the present invention.

Claims

1. A pressurized centrifugal pump, comprising a volute (1) and an impeller (1b4), the volute (1) including a suction end (1a1) and a discharge end (1b1), the impeller (1b4) being located at the discharge end (1b1) of the volute (1), characterized in that, A number of flow guiding vanes (1b2) capable of performing flow splitting are circumferentially arranged on the outer side of the impeller (1b4). The impeller (1b4) can rotate relative to the flow guiding vanes (1b2). Each flow guiding vane (1b2) is circumferentially and uniformly fixed in the volute and can cooperate with the inner wall of the volute (1) to form a pressurization channel (6) for two-stage pressurization. An inclined plate (1b3) is connected between the flow guiding vane (1b2) and the inner wall of the volute (1). The pressurization channel (6) includes a primary pressurization channel (6a) and a secondary pressurization channel (6b). The primary pressurization channel (6a) is formed by the cooperation of two adjacent flow guiding vanes (1b2). The secondary pressurization channel (6b) is formed by the cooperation of the flow guiding vane (1b2), the inclined plate (1b3) and the inner wall of the volute (1). The working chamber at the discharge end is communicated with the transmission chamber at the suction end through the pressurization channel (6). The liquid enters from the suction end at the bottom of the volute and sequentially passes through the transmission chamber and the working chamber and is discharged from the discharge end at the top of the volute. When a part of the liquid in the working chamber is split by the flow guiding vanes and enters the pressurization channel for two-stage pressurization, it converges into the transmission chamber for three-stage pressurization and enters the working chamber together with the liquid in the transmission chamber. Another part of the liquid is discharged from the discharge end at the top.

2. The boosted centrifugal pump according to claim 1, wherein, The inclined plate (1b3) is used to block the liquid from directly entering the discharge end (1b1) through the pressurization channel (6).

3. The boosted centrifugal pump according to claim 1 or 2, characterized in that, A filter screen (4) is covered on the top of the discharge end (1b1).

4. The supercharged centrifugal pump according to claim 3, characterized in that, An inlet cylinder (2) is provided below the volute (1), and a motor (5) is provided in the inlet cylinder (2). The motor (5) is used to drive the impeller (1b4) to rotate.

5. The pressurized centrifugal pump according to claim 4, characterized in that, The volute (1) includes a cover body. The flow guiding vanes (1b2) are fixed on the cover body and are circumferentially and uniformly arranged outside the impeller (1b4).

6. The booster centrifugal pump according to claim 5, wherein, A number of flow guiding vanes (1b2) on the cover body surround the discharge end (1b1) to form a working chamber (1c). The housing of the volute (1) and the cover body cooperate to form a transmission chamber (1d). The transmission chamber (1d) is connected to the working chamber (1c) through the pressurization channel (6).

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