Centrifugal vane pump with adjustable blade pitch and flow guarantee control method thereof

Abstract

The invention discloses a blade pitch adjustable centrifugal vane pump and a flow guarantee control method thereof. The system comprises a distance adjusting pump, an energy and control center, a first ultrasonic flowmeter, a second ultrasonic flowmeter and a lifting pipeline. The centrifugal pump aims at solving the problem that a traditional centrifugal pump is prone to being blocked when a solid-liquid mixture containing large particles is lifted. According to the pump, the blade pitch is dynamically adjusted, the flow velocity is monitored in real time by combining the ultrasonic flowmeter technology, and whether blockage occurs or not can be judged according to the flow velocity difference; when blockage occurs, the control system discharges blockages by adjusting the distance between the impellers, reversing the blades and opening the return valve, and normal work of the pump body is ensured; the method can prevent the pump body from being blocked and improve the fluid conveying efficiency; besides, the system has intelligent control and automatic adjustment functions, can be accurately adjusted according to actual fluid working conditions, and is particularly suitable for conveying large-particle solid-liquid mixtures in the fields of mining industry, chemical industry, sewage treatment and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of lift pump systems and relates to a centrifugal vane pump with adjustable blade pitch and a flow assurance control method thereof. Background Art

[0002] In industrial production, many fields need to handle solid-liquid mixtures containing large particles, such as mining, chemical industry, sewage treatment, etc. Traditional centrifugal pumps often face problems such as blockage and unstable flow when handling these media, especially in the process of conveying large particles, which can easily cause accumulation and blockage in the pump, resulting in reduced pump efficiency and even damage to the equipment.

[0003] Existing technologies usually try to solve these problems by using large-caliber pumps or increasing the pump's delivery capacity, but this method often cannot effectively solve the stability and efficiency issues of the pump under complex working conditions. Especially when the fluid contains solid particles, traditional pumps are prone to clogging due to the deposition or accumulation of particles, affecting the delivery efficiency and even causing equipment failure. Therefore, how to improve the adaptability of the pump, prevent clogging and ensure its long-term stable operation has become an important challenge in the current technological development. Summary of the invention

[0004] In view of the above problems, the present invention aims to provide a centrifugal vane pump with adjustable blade pitch and a flow assurance control method thereof.

[0005] The technical solution of the present invention is: a centrifugal vane pump with adjustable blade pitch described in the present invention; comprising an energy and control center (2), a first ultrasonic flow meter (31), a second ultrasonic flow meter (32) and a lifting pipeline (4);

[0006] A pitch-adjustable pump (1) is installed on the lifting pipeline (4);

[0007] The first ultrasonic flowmeter (31) and the second ultrasonic flowmeter (32) are respectively installed on the pipe wall of the lifting pipe (4) at the lower part and the upper part of the adjustable-pitch pump (1); the two ends of the energy and control center (2) are respectively connected to the first ultrasonic flowmeter (31) and the second ultrasonic flowmeter (32), and are connected to the adjustable-pitch pump (1).

[0008] Furthermore, the adjustable pitch pump (1) comprises a pump group (11), a pump housing (12), a reflux port (13) and a drive motor (15);

[0009] The pump group (11) is installed inside the pump housing (12) and is connected to the drive motor (15) via an installed transmission shaft (115);

[0010] The reflux port (13) is provided on the side of the pump housing (12) and the bottom of the pump unit (11);

[0011] A reflux valve (14) is also installed inside the reflux port (13), and the reflux valve (14), the energy source and the control center (2) are interconnected.

[0012] Furthermore, the pump casing (12) is made of high-strength anti-corrosion metal and is installed on the lifting pipe (4).

[0013] Furthermore, the pump assembly (11) comprises a lower impeller (111), an upper impeller (112), lower blades (113) and upper blades (114);

[0014] The lower impeller (111) and the upper impeller (112) are cylindrical and both are provided with slots, and the slots are nested with each other;

[0015] The lower blade (113) and the upper blade (114) are respectively welded to the provided slots;

[0016] It also includes a transmission shaft (115), an upper impeller lifting mechanism (116) and a lower impeller lifting mechanism (117);

[0017] The transmission shaft (115) passes through the lower impeller (111) and the upper impeller (112), and is connected by a mortise and tenon structure.

[0018] The upper impeller lifting mechanism (116) and the lower impeller lifting mechanism (117) are respectively welded to the upper impeller (112) and the lower impeller (111), and are nested on the transmission shaft (115), and are connected to the energy and control center (2);

[0019] It also includes an anti-blocking sleeve (118) and an anti-blocking sleeve groove (119);

[0020] The anti-blocking sleeve groove (119) is arranged at the edges of the lower impeller (111) and the upper impeller (112), and the anti-blocking sleeve (118) is embedded in the anti-blocking sleeve groove (119).

[0021] Furthermore, the anti-blocking sleeve (118) is a circular thin-walled sleeve.

[0022] Furthermore, a flow assurance control method for a centrifugal vane pump with adjustable blade pitch is provided, and the operation steps are as follows:

[0023] Step (1): the pitch-adjustable pump (1) maintains a normal blade pitch working state, the first ultrasonic flow meter (31) and the second ultrasonic flow meter (32) obtain flow velocity information v1 and v2 in the pipeline in real time, and transmit the flow velocity information to the energy and control center (2);

[0024] Step (2): the energy and control center (2) determines whether |v1-v2|>m; wherein m is a flow rate loss threshold value caused by blockage of the adjustable-pitch pump (1), which is set according to the actual project;

[0025] (2.1): When the energy and control center (2) determines that |v1-v2|>m, it goes to step (3);

[0026] (2.2): When the energy and control center (2) determines that |v1-v2|≤m, it enters step (1) and continues the cycle;

[0027] Step (3): the energy and control center (2) controls the impeller lifting mechanism of the adjustable pitch pump (1) to increase the distance between the upper impeller (112) and the lower impeller (111);

[0028] At the same time, the first ultrasonic flow meter (31) and the second ultrasonic flow meter (32) obtain the flow velocity information v1 and v2 in the pipeline in real time, and transmit the flow velocity information to the energy and control center (2);

[0029] Step (4): The energy and control center (2) determines whether |v1-v2|>m;

[0030] (4.1): When the energy and control center (2) determines that |v1-v2|>m, it goes to step (5);

[0031] (4.2): When the energy and control center (2) determines that |v1-v2|≤m, the energy and control center (2) controls the impeller lifting mechanism of the adjustable pitch pump (1) to close the upper impeller (112) and the lower impeller (111), and enters step (1) to continue the cycle;

[0032] Step (5): the energy and control center (2) controls the return valve (14) of the adjustable pitch pump (1) to open, and controls the blades to reverse, so as to discharge the blocked particles;

[0033] Step (6): After the blocked particles are completely discharged, the energy and control center (2) controls the impeller lifting mechanism of the adjustable pitch pump (1) to close the upper impeller (112) and the lower impeller (111), restarts the adjustable pitch pump (1), and starts a new working cycle.

[0034] Working principle of the present invention:

[0035] 1. Adjustable pitch pump structure and working principle: The adjustable pitch pump is mainly composed of a pump unit, a pump casing, a reflux port, a reflux valve and a drive motor. The pump unit includes upper and lower impellers and blades. The drive motor drives the pump unit to rotate through the transmission shaft to generate negative pressure and provide power for the system. The adjustable pitch pump adjusts the flow rate by changing the impeller's blade pitch to ensure that it can adapt to different fluid requirements;

[0036] 2. Flow rate monitoring and control: The first ultrasonic flow meter and the second ultrasonic flow meter installed on the lifting pipeline monitor the flow rate information in the pipeline in real time. The flow rate difference (v1 and v2) is used as the basis for judging whether the adjustable-pitch pump is blocked. When the flow rate difference exceeds the set threshold, the energy and control center will start the adjustable-pitch pump's pitch adjustment and reversal operation;

[0037] 3. Pitch adjustment and blockage removal: When a blockage occurs, the energy and control center will control the impeller lifting mechanism to adjust the blade pitch of the upper and lower impellers to remove the blockage. By opening the reflux valve and reversing the blades, the blockage is successfully removed and the normal working state of the pump is restored;

[0038] 4. System feedback mechanism: Once the adjustable-pitch pump resumes normal operation, the energy and control center will continue to monitor the flow rate difference in real time to ensure that the pump's working condition is maintained at the optimal state to avoid blockage again.

[0039] The beneficial effects of the present invention are: 1. Improving the conveying efficiency of solid-liquid mixtures: Since the adjustable pitch pump can adjust the blade pitch according to the flow rate information, it optimizes the flow of the fluid and makes the conveying of the solid-liquid mixture smoother and more efficient; 2. Effectively preventing pump blockage: Through real-time flow rate monitoring and precise control methods, blockage problems can be discovered and dealt with in a timely manner. By adjusting the blade pitch and reverse operation, blockages in the pump can be quickly cleared to ensure long-term stable operation of the pump; 3. Automated and intelligent control: The energy and control center can achieve fully automated monitoring and adjustment, reduce manual intervention, improve the automation and intelligence level of the system, reduce the failure rate and improve work efficiency; 4. Adapt to the lifting needs of different media: The pump is particularly suitable for solid-liquid mixtures containing large particles, and can adapt to more complex fluid conditions. It has broad application prospects in the fields of industry, chemical industry, mining, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the system composition of the present invention;

[0041] Figure 2 It is a schematic diagram of the structure of the adjustable pitch pump group of the present invention;

[0042] Figure 3 is a flow chart of the flow assurance control method of the present invention;

[0043] In the figure, 1 is a pitch-adjustable pump, 11 is a pump unit, 111 is a lower impeller, 112 is an upper impeller, 113 is a lower blade, 114 is an upper blade, 115 is a transmission shaft, 116 is an upper impeller lifting mechanism, 117 is a lower impeller lifting mechanism, 118 is an anti-blocking sleeve, and 119 is an anti-blocking sleeve groove;

[0044] 12 is a pump housing; 13 is a reflux port; 14 is a reflux valve; 15 is a drive motor;

[0045] 2 is the energy and control center;

[0046] 31 is a first ultrasonic flow meter, 32 is a second ultrasonic flow meter;

[0047] 4 is the lifting pipeline. DETAILED DESCRIPTION

[0048] The specific technical scheme of the present invention is further described in detail below with reference to specific examples.

[0049] As shown in the figure, the centrifugal vane pump with adjustable blade pitch described in the present invention mainly includes an adjustable pitch pump 1, an energy and control center 2, a first ultrasonic flow meter 31, a second ultrasonic flow meter 32 and a lifting pipeline 4;

[0050] The adjustable-pitch pump 1 is installed on the lifting pipeline 4 as the power source of the lifting system of the entire pipeline, and is connected to the energy and control center 2 to obtain driving energy and working control signals from the energy and control center 2;

[0051] The first ultrasonic flowmeter 31 and the second ultrasonic flowmeter 32 are respectively installed on the pipe walls of the lower and upper lifting pipes 4 of the adjustable pitch pump 1, and the average flow velocity on the lower and upper pipe sections of the adjustable pitch pump 1 is obtained by ultrasonic velocity measurement technology, and is connected to the energy and control center 2. The energy and control center 2 determines whether blockage occurs in the adjustable pitch pump 1 by judging the flow velocity difference at both ends of the adjustable pitch pump 1, thereby controlling the adjustable pitch pump 1 to perform corresponding work.

[0052] like Figure 1 As shown, the adjustable pitch pump 1 is mainly composed of a pump group 11, a pump housing 12, a reflux port 13, a reflux valve 14 and a drive motor 15; wherein the pump group 11 is arranged inside the pump housing 12 and connected to the drive motor 15;

[0053] The pump housing 12 is made of high-strength anti-corrosion metal to provide a watertight space, so that the pump group 11 rotates to generate negative pressure to provide negative pressure for the entire system. The drive motor 15 is connected to the pump group 11 through a transmission shaft to convert the electrical energy transmitted from the energy and control center 2 into kinetic energy of the pump group 11, thereby generating negative pressure to provide increased negative pressure for the entire pipe system.

[0054] The reflux port 13 is opened at the side of the pump casing 12 and the bottom of the pump group 11, and a reflux valve 14 is installed inside the reflux port 13. The reflux valve 14 is connected to the energy and control center 2. When the adjustable pitch pump 1 is blocked, the energy and control center 2 controls the pump group 11 to increase the blade pitch, rotate in the opposite direction, and open the reflux valve 14, so that the blockage in the adjustable pitch pump 1 can be discharged from the reflux port 13.

[0055] like Figure 2As shown, the pump unit 11 includes a lower impeller 111, an upper impeller 112, lower blades 113, upper blades 114, a transmission shaft 115, an upper impeller lifting mechanism 116, a lower impeller lifting mechanism 117, an anti-blocking sleeve 118 and an anti-blocking sleeve groove 119;

[0056] The lower impeller 111 and the upper impeller 112 are cylindrical and have slots, and the slots of the lower impeller 111 and the upper impeller 112 can be nested with each other, and the lower blades 113 and the upper blades 114 are welded to the slots of the lower impeller 111 and the upper impeller 112 respectively;

[0057] The transmission shaft 115 passes through the lower impeller 111 and the upper impeller 112, and is connected by a mortise and tenon structure, so as to transmit the rotation energy generated by the driving motor 15 to the lower impeller 111, the upper impeller 112, the lower blades 113 and the upper blades 114;

[0058] The upper impeller lifting mechanism 116 and the lower impeller lifting mechanism 117 are respectively welded to the upper impeller 112 and the lower impeller 111 and are nested on the transmission shaft 115, and are connected to the energy and control center 2. On the one hand, they can clamp and fix the lower impeller 111 and the upper impeller 112 on the transmission shaft 115, and on the other hand, they can drive the upper impeller 112 and the lower blades 113 to move up and down along the transmission shaft 115;

[0059] The anti-blocking sleeve 118 is a circular thin-walled sleeve, which is installed in the anti-blocking sleeve groove 119 inside the lower impeller 111 and the upper impeller 112. When the upper impeller lifting mechanism 116 and the lower impeller lifting mechanism 117 drive the upper impeller 112 and the lower impeller 111 to start separately, the particles in the pump block the gap between the lower impeller 111 and the upper impeller 112.

[0060] The anti-clogging sleeve groove 119 is provided at the edge of the lower impeller 111 and the upper impeller 112 for embedding the anti-clogging sleeve 118 .

[0061] like Figure 3 As shown, the flow assurance control method of the centrifugal vane pump with adjustable blade pitch comprises the following steps:

[0062] Step (1), the pitch-adjustable pump 1 maintains a normal blade pitch working state, the first ultrasonic flowmeter 31 and the second ultrasonic flowmeter 32 obtain the flow velocity information v1 and v2 in the pipeline in real time, and transmit the flow velocity information to the energy and control center 2;

[0063] Step (2), the energy and control center 2 determines whether |v1-v2|>m; wherein m is the flow rate loss threshold caused by the blockage of the adjustable-pitch pump 1, which is set according to the actual project;

[0064] (2.1), when the energy and control center 2 determines that |v1-v2|>m, it goes to step (3);

[0065] (2.2) When the energy and control center 2 determines that |v1-v2|≤m, it goes to step (1) and continues the cycle;

[0066] Step (3), the energy and control center 2 controls the impeller lifting mechanism of the adjustable pitch pump 1 to increase the distance between the upper impeller 112 and the lower impeller 111; at the same time, the first ultrasonic flow meter 31 and the second ultrasonic flow meter 32 obtain the flow velocity information v1 and v2 in the pipeline in real time, and transmit the flow velocity information to the energy and control center 2;

[0067] Step (4), the energy and control center 2 determines whether |v1-v2|>m;

[0068] (4.1), when the energy and control center 2 determines that |v1-v2|>m, it goes to step (5);

[0069] (4.2) When the energy and control center 2 determines that |v1-v2|≤m, the energy and control center 2 controls the impeller lifting mechanism of the adjustable pitch pump 1 to close the upper impeller 112 and the lower impeller 111, and enters step (1) to continue the cycle;

[0070] Step (5), the energy and control center 2 controls the return valve 14 of the adjustable pitch pump 1 to open, and controls the blades to reverse, so as to discharge the blocked particles;

[0071] Step (6), after the blocked particles are completely discharged, the energy and control center 2 controls the impeller lifting mechanism of the adjustable pitch pump 1 to close the upper impeller 112 and the lower impeller 111, restart the adjustable pitch pump 1, and start a new working cycle.

[0072] The present invention can effectively solve the blockage problem caused by large particles in the solid-liquid mixture by dynamically adjusting the impeller pitch of the pump 1 and monitoring the flow rate difference in real time; the present invention combines the ultrasonic flow meter monitoring technology with the intelligent control system, adjusts the impeller pitch and reverses the blades to remove blockages, ensures the normal operation of the pump, and improves the flow assurance capability of the pump, and has strong adaptability and high efficiency.

[0073] The present invention can not only improve the conveying efficiency of the solid-liquid mixture and reduce the risk of pump blockage, but also extend the service life of the equipment, and has important application value for processing the solid-liquid mixture containing large particles.

Claims

1. A centrifugal vane pump with adjustable blade pitch, characterized in that: It comprises an energy and control center (2), a first ultrasonic flow meter (31), a second ultrasonic flow meter (32) and a lifting pipeline (4); A pitch-adjustable pump (1) is installed on the lifting pipeline (4); The first ultrasonic flowmeter (31) and the second ultrasonic flowmeter (32) are respectively installed on the pipe wall of the lifting pipe (4) at the lower part and the upper part of the adjustable-pitch pump (1); the two ends of the energy and control center (2) are respectively connected to the first ultrasonic flowmeter (31) and the second ultrasonic flowmeter (32), and are connected to the adjustable-pitch pump (1).

2. A centrifugal vane pump with adjustable blade pitch according to claim 1, characterized in that: The adjustable pitch pump (1) comprises a pump group (11), a pump casing (12), a reflux port (13) and a drive motor (15); The pump group (11) is installed inside the pump housing (12) and is connected to the drive motor (15) via an installed transmission shaft (115).

3. A centrifugal vane pump with adjustable blade pitch according to claim 2, characterized in that: The reflux port (13) is opened on the side of the pump housing (12) and the bottom of the pump unit (11).

4. A centrifugal vane pump with adjustable blade pitch according to claim 2, characterized in that: A reflux valve (14) is also installed inside the reflux port (13), and the reflux valve (14), the energy source and the control center (2) are interconnected.

5. A centrifugal vane pump with adjustable blade pitch according to claim 2, characterized in that: The pump casing (12) is made of high-strength anti-corrosion metal and is installed on the lifting pipeline (4).

6. A centrifugal vane pump with adjustable blade pitch according to claim 2, characterized in that: The pump assembly (11) comprises a lower impeller (111), an upper impeller (112), lower blades (113) and upper blades (114); The lower impeller (111) and the upper impeller (112) are cylindrical and both are provided with slots, and the slots are nested with each other; The lower blade (113) and the upper blade (114) are respectively welded to the provided slots.

7. A centrifugal vane pump with adjustable blade pitch according to claim 6, characterized in that: It also includes a transmission shaft (115), an upper impeller lifting mechanism (116) and a lower impeller lifting mechanism (117); The transmission shaft (115) passes through the lower impeller (111) and the upper impeller (112), and is connected by a mortise and tenon structure. The upper impeller lifting mechanism (116) and the lower impeller lifting mechanism (117) are respectively welded to the upper impeller (112) and the lower impeller (111), and are nested on the transmission shaft (115), and are connected to the energy and control center (2).

8. A centrifugal vane pump with adjustable blade pitch according to claim 6, characterized in that: It also includes an anti-blocking sleeve (118) and an anti-blocking sleeve groove (119); The anti-blocking sleeve groove (119) is arranged at the edges of the lower impeller (111) and the upper impeller (112), and the anti-blocking sleeve (118) is embedded in the anti-blocking sleeve groove (119).

9. A centrifugal vane pump with adjustable blade pitch according to claim 7, characterized in that: The anti-clogging sleeve (118) is a circular thin-walled sleeve.

10. A flow assurance control method for a centrifugal vane pump with adjustable blade pitch according to any one of claims 1 to 9, characterized in that: The operation steps are as follows: Step (1): the pitch-adjustable pump (1) maintains a normal blade pitch working state, the first ultrasonic flow meter (31) and the second ultrasonic flow meter (32) obtain flow velocity information v1 and v2 in the pipeline in real time, and transmit the flow velocity information to the energy and control center (2); Step (2): the energy and control center (2) determines whether |v1-v2|>m; wherein m is a flow rate loss threshold value caused by blockage of the adjustable-pitch pump (1), which is set according to the actual project; (2.1): When the energy and control center (2) determines that |v1-v2|>m, it goes to step (3); (2.2): When the energy and control center (2) determines that |v1-v2|≤m, it enters step (1) and continues the cycle; Step (3): the energy and control center (2) controls the impeller lifting mechanism of the adjustable pitch pump (1) to increase the distance between the upper impeller (112) and the lower impeller (111); At the same time, the first ultrasonic flow meter (31) and the second ultrasonic flow meter (32) obtain the flow velocity information v1 and v2 in the pipeline in real time, and transmit the flow velocity information to the energy and control center (2); Step (4): The energy and control center (2) determines whether |v1-v2|>m; (4.1): When the energy and control center (2) determines that |v1-v2|>m, it goes to step (5); (4.2): When the energy and control center (2) determines that |v1-v2|≤m, the energy and control center (2) controls the impeller lifting mechanism of the adjustable pitch pump (1) to close the upper impeller (112) and the lower impeller (111), and enters step (1) to continue the cycle; Step (5): the energy and control center (2) controls the return valve (14) of the adjustable pitch pump (1) to open, and controls the blades to reverse, so as to discharge the blocked particles; Step (6): After the blocked particles are completely discharged, the energy and control center (2) controls the impeller lifting mechanism of the adjustable pitch pump (1) to close the upper impeller (112) and the lower impeller (111), restarts the adjustable pitch pump (1), and starts a new working cycle.

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