Centrifugal vane pump with adjustable vane pitch and flow assurance control method thereof

Abstract

The application discloses a centrifugal blade pump with adjustable blade pitch and a flow guarantee control method thereof, and belongs to the technical field of lifting pump systems. The application aims to solve the problem that the traditional centrifugal pump is prone to blockage when lifting solid-liquid mixtures containing large particles. The pump can judge whether blockage occurs according to the flow rate difference by dynamically adjusting the blade pitch and combining with the ultrasonic flowmeter technology to monitor the flow rate in real time. When blockage occurs, the control system adjusts the impeller spacing, reverses the blades and opens the backflow valve to discharge the blockage, ensuring the normal operation of the pump body. The method can avoid pump blockage and improve fluid conveying efficiency. In addition, the system has intelligent control and automatic adjustment functions, can accurately adjust according to the actual fluid working condition, and is especially suitable for conveying large-particle solid-liquid mixtures in the fields of mining, chemical industry, sewage treatment and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of booster pump systems, and relates to a centrifugal blade pump with adjustable blade pitch and a flow guarantee control method thereof. BACKGROUND

[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 during the transportation of large particles, which can easily cause accumulation and blockage in the pump, leading to a decrease in pump efficiency and even damage to the equipment.

[0003] The prior art usually tries to solve these problems by using large-diameter pump bodies or increasing the delivery capacity of the pump, but this method often cannot effectively solve the stability and efficiency problems of the pump under complex working conditions. Especially when the fluid contains solid particles, the traditional pump type is prone to blockage 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 blockage and ensure its long-term stable operation has become an important challenge for current technology development. SUMMARY

[0004] To solve the above problems, the present application aims to provide a centrifugal blade pump with adjustable blade pitch and a flow guarantee control method thereof.

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

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

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

[0008] Further, the pitch-adjusting pump (1) comprises a pump group (11), a pump shell (12), a backflow port (13), and a driving motor (15);

[0009] The pump group (11) is arranged inside the pump shell (12) and is connected to the driving motor (15) through the transmission shaft (115);

[0010] The backflow port (13) is opened in the side part of the pump shell (12) and the bottom part of the pump group (11);

[0011] A reflux valve (14) is further arranged inside the reflux port (13), and the reflux valve (14) is in communication with the energy and control center (2).

[0012] Further, the pump shell (12) is made of high-strength corrosion-resistant metal and is arranged on the lifting pipe (4).

[0013] Further, the pump group (11) comprises a lower impeller (111), an upper impeller (112), a lower blade (113), and an upper blade (114).

[0014] The lower impeller (111) and the upper impeller (112) are both cylindrical and are provided with clamping grooves which are nested with each other.

[0015] The lower blade (113) and the upper blade (114) are respectively welded on the clamping grooves.

[0016] Further, the pump group (11) comprises a lower impeller (111), an upper impeller (112), a lower blade (113), and an upper blade (114).

[0017] The transmission shaft (115) penetrates 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 in communication with the energy and control center (2).

[0019] Further, the pump group (11) comprises a lower impeller (111), an upper impeller (112), a lower blade (113), and an upper blade (114).

[0020] The anti-plug sleeve (118) is embedded in the anti-plug sleeve slot (119).

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

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

[0023] Step (1): The pitch-adjustable pump (1) is kept in a normal pitch working state, the first ultrasonic flowmeter (31) and the second ultrasonic flowmeter (32) acquire real-time flow rate information v1 and v2 in the pipeline, and transmit the flow rate 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 the flow rate loss threshold caused by the blockage of the variable-pitch pump (1), which is set according to the actual engineering;

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

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

[0027] Step (3): The energy and control center (2) controls the impeller lifting mechanism of the variable-pitch pump (1) to pull apart the upper impeller (112) and the lower impeller (111);

[0028] At the same time, the first ultrasonic flowmeter (31) and the second ultrasonic flowmeter (32) obtain the flow rate information v1 and v2 in the pipeline in real time, and transmit the flow rate 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, step (5) is entered;

[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 variable-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 backflow valve (14) of the variable-pitch pump (1) to open, and controls the blade to reverse 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 variable-pitch pump (1) to close the upper impeller (112) and the lower impeller (111), restarts the variable-pitch pump (1), and starts a new working cycle.

[0034] The working principle of the present application is as follows:

[0035] 1. Structure and working principle of the variable-pitch pump: The variable-pitch pump mainly comprises a pump set, a pump shell, a backflow port, a backflow valve and a driving motor, and the pump set comprises upper and lower impellers and blades. The driving motor drives the pump set to rotate through a transmission shaft to generate negative pressure and provide power for the system. The variable-pitch pump adjusts the flow by changing the pitch of the impeller to ensure that different fluid demands are met;

[0036] 2. Flow rate monitoring and control: Real-time monitoring of flow rate information in the pipeline through the first ultrasonic flowmeter and the second ultrasonic flowmeter installed on the lifting pipeline. The flow rate difference (v1 and v2) is used as the basis for judging whether the distance adjusting pump is blocked. When the flow rate difference exceeds the set threshold, the energy and control center will start the distance adjusting and reverse operation of the distance adjusting pump;

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

[0038] 4. System feedback mechanism: Once the distance adjusting pump returns to normal operation, the energy and control center will continue to monitor the flow rate difference in real time to ensure that the pump operates in the best state and avoids blockage again.

[0039] The advantages of the present application are: 1. Improve the conveying efficiency of solid-liquid mixture: The distance adjusting pump can adjust the pitch according to the flow rate information, thereby optimizing the flow of the fluid, making the conveying of solid-liquid mixture more stable and efficient; 2. Effectively prevent pump body from being blocked: Through real-time flow rate monitoring and accurate control method, the blockage problem can be found and handled in time. By adjusting the pitch and reversing the operation, the blockage in the pump is quickly removed to ensure long-term stable operation of the pump; 3. Automatic and intelligent control: The energy and control center can realize full automatic monitoring and adjustment, reduce manual intervention, improve the automation and intelligence level of the system, reduce the failure rate and improve the work efficiency; 4. Adapt to the lifting needs of different media: The pump is especially suitable for solid-liquid mixture containing large particles and can adapt to more complex fluid working conditions, having wide application prospects in industrial, chemical, mining and other fields. BRIEF DESCRIPTION OF DRAWINGS

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

[0041] Figure 2 is a distance adjusting pump group structure schematic diagram of the present application;

[0042] Figure 3 is a flow guarantee control method flow chart of the present application;

[0043] In the figure, 1 is a distance adjusting pump, 11 is a pump group, 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 slot;

[0044] 12 is a pump shell; 13 is a backflow port; 14 is a backflow valve; and 15 is a driving motor;

[0045] 2 is the energy and control center;

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

[0047] 4 is the lifting pipeline. Detailed Implementation

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

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

[0050] The adjustable pump 1 serves as the power source for the entire pipeline lifting system. It is installed on the lifting pipeline 4 and connected to the energy and control center 2 to obtain driving energy and work control signals from the energy and control center 2.

[0051] The first ultrasonic velocimeter 31 and the second ultrasonic velocimeter 32 are respectively installed on the pipe walls of the lower and upper lifting pipes 4 of the adjustable-pitch pump 1. The average flow velocity on the cross section of the lower and upper pipes of the adjustable-pitch pump 1 is obtained by ultrasonic velocimetry technology and connected to the energy and control center 2. The energy and control center 2 determines whether there is a blockage in the adjustable-pitch pump 1 by judging the flow velocity difference between the two ends of the adjustable-pitch pump 1, thereby controlling the adjustable-pitch pump 1 to perform the corresponding work.

[0052] like Figure 1 As shown, the adjustable-pitch pump 1 mainly consists of a pump set 11, a pump casing 12, a return port 13, a return valve 14, and a drive motor 15; wherein, the pump set 11 is installed inside the pump casing 12 and is connected to the drive motor 15.

[0053] The pump casing 12 is made of high-strength corrosion-resistant metal to provide a watertight space, allowing the pump set 11 to rotate and generate negative pressure to provide negative pressure for the entire system. The drive motor 15 is connected to the pump set 11 through a transmission shaft, converting the electrical energy transmitted from the energy and control center 2 into the kinetic energy of the pump set 11, thereby generating negative pressure and providing a boosting negative pressure for the entire piping system.

[0054] The return port 13 is located on the side of the pump casing 12 and at the bottom of the pump set 11. A return valve 14 is installed inside the return port 13. The return valve 14 is connected to the energy and control center 2. When the pitch pump 1 is blocked, the energy and control center 2 controls the pump set 11 to raise the blade pitch and rotate in the opposite direction, and opens the return valve 14, so that the blockage in the pitch pump 1 can be discharged from the return port 13.

[0055] like Figure 2As shown, the pump set 11 comprises a lower impeller 111, an upper impeller 112, a lower blade 113, an upper blade 114, a transmission shaft 115, an upper impeller lifting mechanism 116, a lower impeller lifting mechanism 117, a plug sleeve 118 and a plug sleeve slot 119.

[0056] The lower impeller 111 and the upper impeller 112 are both cylindrical and have clamping grooves, and the clamping grooves of the lower impeller 111 and the upper impeller 112 can be nested with each other, while the lower blade 113 and the upper blade 114 are respectively welded on the clamping grooves of the lower impeller 111 and the upper impeller 112.

[0057] The transmission shaft 115 penetrates the lower impeller 111 and the upper impeller 112 and is connected by a mortise and tenon structure for nesting, so as to transmit the rotary energy generated by the driving motor 15 to the lower impeller 111, the upper impeller 112, the lower blade 113 and the upper blade 114.

[0058] The upper impeller lifting mechanism 116 and the lower impeller lifting mechanism 117 are respectively welded with the upper impeller 112 and the lower impeller 111 and are nested on the transmission shaft 115, and are in communication with the energy and control center 2, which can clamp and fix the lower impeller 111 and the upper impeller 112 on the transmission shaft 115, and can drive the upper impeller 112 and the lower blade 113 to move up and down along the transmission shaft 115.

[0059] The plug sleeve 118 is a circular thin-walled sleeve, which is arranged in the plug sleeve slot 119 inside the lower impeller 111 and the upper impeller 112, and 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, it can ensure that the particles in the pump do not block the gap between the lower impeller 111 and the upper impeller 112.

[0060] The plug sleeve slot 119 is provided at the edge of the lower impeller 111 and the upper impeller 112 for embedding the plug sleeve 118.

[0061] As shown in the drawings, Figure 3 The flow guarantee control method of the variable-pitch centrifugal blade pump comprises the following steps:

[0062] Step (1), the variable-pitch pump 1 keeps a normal pitch working state, the first ultrasonic flowmeter 31 and the second ultrasonic flowmeter 32 acquire real-time flow rate information v1 and v2 in the pipeline and transmit the flow rate information to the energy and control center 2.

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

[0064] (2.1) When the energy and control center 2 judges that |v1-v2|>m, step (3) is entered.

[0065] (2.2), when the energy and control center 2 judges |v1-v2|≤m, step (1) is entered, and the cycle continues;

[0066] Step (3), the energy and control center 2 controls the impeller lifting mechanism of the adjustable-pitch pump 1 to pull apart the upper impeller 112 and the lower impeller 111; at the same time, the first ultrasonic flowmeter 31 and the second ultrasonic flowmeter 32 acquire the flow rate information v1 and v2 in the pipeline in real time and transmit the flow rate information to the energy and control center 2;

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

[0068] (4.1), when the energy and control center 2 judges |v1-v2|>m, step (5) is entered;

[0069] (4.2), when the energy and control center 2 judges |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 step (1) is entered, and the cycle continues;

[0070] Step (5), the energy and control center 2 controls the backflow valve 14 of the adjustable-pitch pump 1 to open and controls the blade to reverse 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, restarts the adjustable-pitch pump 1, and starts a new working cycle.

[0072] The present application can effectively solve the problem of blockage caused by large particles in the solid-liquid mixture by dynamically adjusting the pitch of the pump 1 and monitoring the flow rate difference in real time; the present application combines the ultrasonic flowmeter monitoring technology and the intelligent control system, adjusts the distance between the impellers, reverses the blades to discharge the blocked particles, ensures the normal operation of the pump, improves the flow protection capability of the pump, and has strong adaptability and high efficiency.

[0073] The present application not only can improve the conveying efficiency of the solid-liquid mixture, reduce the risk of pump blockage, but also can prolong 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 spacing, characterized in that, Includes an energy and control center (2), a first ultrasonic flow meter (31), a second ultrasonic flow meter (32), and a lift pipe (4); An adjustable pump (1) is installed on the lifting pipe (4); The first ultrasonic flow meter (31) and the second ultrasonic flow meter (32) are respectively installed on the pipe wall of the lifting pipe (4) at the lower and upper parts of the adjustable distance pump (1). The two ends of the energy and control center (2) are respectively connected to the first ultrasonic flow meter (31) and the second ultrasonic flow meter (32) and are connected to the adjustable distance pump (1). The adjustable-pitch pump (1) includes a pump set (11), a pump casing (12), a return port (13), and a drive motor (15). The pump set (11) is installed inside the pump casing (12) and is connected to the drive motor (15) through the installed drive shaft (115); The pump assembly (11) includes a lower impeller (111), an upper impeller (112), a lower blade (113), and an upper blade (114). The lower impeller (111) and the upper impeller (112) are cylindrical and each has a slot, and the slots are nested together. The lower blade (113) and the upper blade (114) are respectively welded to the slots. It also includes a drive shaft (115), an upper impeller lifting mechanism (116), and a lower impeller lifting mechanism (117). The drive shaft (115) passes through the lower impeller (111) and the upper impeller (112) and is connected by a tenon and mortise 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 nested on the transmission shaft (115), and are connected to the energy and control center (2); The adjustable-pitch pump (1) adjusts the flow rate by changing the impeller pitch to ensure adaptability to different fluid requirements.

2. The centrifugal vane pump with adjustable blade spacing according to claim 1, characterized in that, The return port (13) is located on the side of the pump casing (12) and at the bottom of the pump assembly (11).

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

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

5. A centrifugal vane pump with adjustable blade spacing according to claim 1, characterized in that, It also includes a plugging sleeve (118) and a plugging sleeve groove (119). The anti-clogging sleeve groove (119) is installed at the edge of the lower impeller (111) and the upper impeller (112), and the anti-clogging sleeve (118) is embedded in the anti-clogging sleeve groove (119).

6. A centrifugal vane pump with adjustable blade spacing according to claim 5, characterized in that, The anti-blocking sleeve (118) is a circular thin-walled sleeve.

7. A flow assurance control method for a centrifugal vane pump with adjustable blade pitch as described in any one of claims 1-6, characterized in that, The operating steps are as follows: Step (1): The adjustable pitch pump (1) maintains normal blade pitch working state. The first ultrasonic flow meter (31) and the second ultrasonic flow meter (32) acquire 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 (2): The Energy and Control Center (2) determines whether |v1-v2|>m; where 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. (2.1): When the Energy and Control Center (2) determines that |v1-v2|>m, then proceed to step (3); (2.2): When the Energy and Control Center (2) determines that |v1-v2|≤m, it proceeds to step (1) and continues the loop; Step (3): The Energy and Control Center (2) controls the impeller lifting mechanism of the pitch pump (1) to increase the distance between the upper impeller (112) and the lower impeller (111); Meanwhile, the first ultrasonic flow meter (31) and the second ultrasonic flow meter (32) acquire 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): Energy and Control Center (2) determines whether |v1-v2|>m; (4.1): When the Energy and Control Center (2) determines that |v1-v2|>m, proceed 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 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 opening of the return valve (14) of the pitch pump (1) and controls the blades to reverse, so as to discharge the blockage particles; Step (6): After the blockage particles are completely discharged, the energy and control center (2) controls the impeller lifting mechanism of the pitch pump (1) to close the upper impeller (112) and the lower impeller (111), restart the pitch pump (1), and start a new working cycle.

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