A barring gear system device and usage method for a centrifugal pump

Abstract

A barring gear system device and method for a centrifugal pump. The device includes a barring gear component connected to the centrifugal pump. The barring gear component pushes the impeller of the centrifugal pump to reverse, and the reverse rotation of the impeller drives the pump shaft to reverse. The barring gear component includes an energy storage device, and the energy storage device is communicated with the centrifugal pump through a pipeline. There is a liquid with pressure in the energy storage device. The usage method includes an energy storage step and an energy release step. In the energy storage step, an external pressure supply component is used to input a liquid with pressure into the energy storage device and store it in the energy storage device. In the energy release step, the liquid stored in the energy storage device is connected to the centrifugal pump to make the impeller of the centrifugal pump reverse. The barring of the centrifugal pump is completed through the above steps. The advantages of the present invention are that by sucking in a liquid with a certain pressure and making the impeller reverse to drive the pump shaft to reverse, the barring is easily achieved, solving the problems of difficult barring, inconvenient barring, and easy occurrence of safety accidents in large pumps.

Description

Technical Field

[0001] The present invention relates to operating machinery and equipment in the field of chemical production, and particularly relates to a barring device and method for a large water pump (centrifugal pump). Background Art

[0002] In chemical production, centrifugal pumps are undoubtedly the most widely used pumps. However, faults such as burning pumps and motors frequently occur during production, which may be due to the reasons of the pump or motor itself, or cross-reasons. Therefore, each production enterprise has strictly formulated operating procedures for starting and stopping pumps to ensure the normal operation of the pump and motor system. Among them, barring the pump is the most basic. For small pumps, due to their small structure and low shaft power, it is relatively convenient to bar the pump, and even barring may not be necessary. For pumps larger to a certain extent, the operating procedure strictly requires barring the pump before starting. However, due to the large size of the pump body and the protective cover often installed for the coupling connection between them, the operating space for barring is inconvenient and the required torque is large, making it difficult to bar the pump and the personnel are easily injured.

[0003] For barring medium-sized and large pumps, especially large pumps such as water pumps driven by steam turbines, generally matching barring equipment will be configured to achieve mechanical barring. For medium-sized pumps, in the absence of barring equipment, manual barring is often carried out, such as rotating by holding the shaft or using simple tools (such as pry bars) to complete barring. Although there are corresponding barring devices, tools or methods for barring various types of pumps, such as the inventions disclosed in CN2725593, CN202149017U, CN202520537U, etc., the cost of barring, the convenience and efficiency of operation drive engineering and technical personnel to seek a barring device, system or technical method that saves time, effort and cost.

[0004] As we know, the essence of barring the pump before starting is to check whether the pump shaft is stuck, so as to avoid burning the motor due to large shaft blocking force after starting. Usually, the barring rotating shaft is carried out in the direction of the pump impeller rotation. However, no blocking during reverse rotation can also indicate that the pump meets the starting conditions. Based on this, can engineering and technical personnel use a method to reverse the water pump (short time) in a certain situation to replace the traditional water pump barring method? However, several issues need to be considered: First, can a centrifugal pump allow reverse rotation, and if it can, how long is the allowable reverse rotation time? Second, there must be valves in the pump pipe system. Whether the timeliness of valve operation meets the requirements of reverse rotation torque and time? Third, whether the fluid state in the system meets the requirements at any time? Fourth, how to ensure the ability to reverse the water pump impeller at any time.

[0005] Therefore, it is necessary to design a relatively reasonable water pump barring mechanism and method to achieve hydraulic reverse rotation of the impeller and then drive the shaft to reverse (within a short time) under the condition of making full use of existing conditions, replace the traditional mechanical barring or manual barring, achieve the purpose of saving time, effort and cost, and ensure safety at the same time. Summary of the Invention

[0006] The object of the present invention is to overcome the above deficiencies, and to provide a scientific and reasonable barring gear system device and method for a centrifugal pump, so as to reduce the labor intensity of operators, lower the equipment investment, fully ensure the operation safety, effectively protect the on-site environment, and provide full guarantee for the high-efficiency operation of the system composed of a water pump, a motor and a regulating and controlling device.

[0007] The object of the present invention is achieved as follows: A barring gear system device for a centrifugal pump includes a barring component connected to the centrifugal pump, the barring component pushes the impeller of the centrifugal pump to reverse, and the reverse rotation of the impeller drives the pump shaft to reverse;

[0008] The barring component includes an energy storage device, the energy storage device is communicated with the centrifugal pump through a pipeline, and a liquid with pressure is contained in the energy storage device.

[0009] Furthermore, the energy storage device includes a cylinder body, the cylinder body is divided into an upper sealing unit and a lower sealing unit by an internal piston, an energy storage component is arranged in the upper sealing unit, one end of the energy storage component is connected to the inner top wall of the cylinder body, and the other end is connected to the piston; the lower sealing unit is a cavity, the lower sealing unit is a container bin for storing fluid, and the lower sealing unit is communicated with the centrifugal pump.

[0010] Furthermore, three communication ports are arranged on the lower sealing unit, one of the communication ports is communicated with an external pressure supply component, and the other two communication ports are respectively communicated with the centrifugal pump and a pressure gauge.

[0011] Furthermore, a first one-way valve and a first control valve are arranged on the water supply pipe between the lower sealing unit and the centrifugal pump.

[0012] Furthermore, a second one-way valve and a second control valve are arranged on the water pipe between the external pressure supply component and the lower sealing unit.

[0013] Furthermore, a vibration data collector is arranged on the surface of the centrifugal pump, the vibration data collector is connected to a controller, and the controller is connected to the first control valve, and the controller controls the opening or closing of the first control valve.

[0014] Furthermore, the pressure gauge is connected to the controller, the controller is connected to the second control valve arranged on the water pipe between the external pressure supply component and the lower sealing unit, and the controller controls the opening or closing of the second control valve.

[0015] Furthermore, the controller is connected to the first one-way valve, and the controller controls the opening degree of the first one-way valve.

[0016] A method for using a barring gear system for a centrifugal pump includes an energy storage step and an energy release step;

[0017] In the energy storage step, a pressurized liquid is input into the energy storage device by an external pressure supply component and stored in the energy storage device;

[0018] In the energy release step, the liquid stored in the energy storage device is connected to a centrifugal pump, causing the impeller of the centrifugal pump to rotate in reverse;

[0019] The barring of the centrifugal pump is completed through the above steps.

[0020] Preferably, a method for using a barring system of a centrifugal pump further includes a vibration self-check step and a variable flow self-check step;

[0021] In the vibration self-check step, the vibration data of the energy storage device is collected in real time by a vibration data collector provided on the centrifugal pump. If the vibration data is less than the set value, it is determined as unqualified; if the vibration data is greater than the set value, it is determined as qualified;

[0022] In the variable flow self-check step, after determining as unqualified, the amount of the liquid stored in the energy storage device flowing into the centrifugal pump is increased, and the vibration self-check step is executed again in a loop. The loop is executed at least once. If it is still determined as unqualified, the barring is stopped.

[0023] After the implementation of the present invention, the following advantages are achieved:

[0024] 1) Make full use of the relevant resources of the working pipe network of the centrifugal pump, use the water in the system to reverse the pump shaft of the centrifugal pump, replace the traditional machine barring or manual barring, reduce equipment investment, lower the operation intensity, and ensure operation safety;

[0025] 2) The combination of this device and the centrifugal pump pipe network is convenient. It can be fixedly connected or movably connected, and can be used individually in a one-to-one correspondence or shared in a one-to-many manner, improving the resource utilization rate;

[0026] 3) It is convenient for personnel to intervene during barring, the control is flexible and convenient, and it can also be remotely controlled using a controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the drawings and examples.

[0028] Figure 1 It is a schematic diagram of the principle of the barring system device of the centrifugal pump.

[0029] Figure 2 It is a schematic structural diagram of the barring system device of the centrifugal pump.

[0030] Figure 3 It is a schematic control diagram of the barring system device of the centrifugal pump.

[0031] Figure 4 It is a preferred schematic structural diagram of the barring system device of the centrifugal pump.

[0032] Figure 5It is a block diagram of the usage method of the barring gear system device of a centrifugal pump.

[0033] Figure 6 It is a preferred block diagram of the usage method of the barring gear system device of a centrifugal pump.

[0034] As shown in the figure, there are a centrifugal pump 1, a barring gear component 2, an external pressure supply component 3, a pressure gauge 4, a vibration data collector 5, a controller 6, an energy storage device 21, a piston 22, an energy storage component 23, a first one-way valve 24, a first control valve 25, a second one-way valve 26, a second control valve 27, an energy storage step S1, an energy release step S2, a vibration self-check step S3, and a current conversion self-check step S4. Specific implementation manners

[0035] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings through embodiments, but the protection scope of the present invention is not limited to the described embodiments.

[0036] As Figure 1 、 Figure 2 shown, a barring gear system device of a centrifugal pump includes a barring gear component 2 connected to the centrifugal pump 1. The barring gear component 2 pushes the impeller of the centrifugal pump to reverse, and the reverse rotation of the impeller drives the pump shaft to reverse;

[0037] The barring gear component 2 includes an energy storage device 21. The energy storage device 21 is communicated with the centrifugal pump 1 through a pipeline. There is a liquid with pressure in the energy storage device 21. Preferably, the energy storage device 21 includes a cylinder body. The cylinder body is divided into an upper sealing unit and a lower sealing unit by an internal piston 22. The upper sealing unit is internally provided with an energy storage component 23. One end of the energy storage component 23 is connected to the inner top wall of the cylinder body, and the other end is connected to the piston 22. Generally, the energy storage component 23 is an elastic component or an elastic assembly, and a spring structure is adopted; the lower sealing unit is a cavity, and the lower sealing unit is a container chamber for storing fluid. The fluid stored in the lower sealing unit is a pressurized liquid. The lower sealing unit is communicated with the centrifugal pump 1. There are three communication ports on the lower sealing unit. One of the communication ports is communicated with the external pressure supply component 3, and the other two communication ports are respectively communicated with the centrifugal pump 1 and the pressure gauge 4. A first one-way valve 24 and a first control valve 25 are provided on the water supply pipe between the lower sealing unit and the centrifugal pump 1. When barring is required, the first one-way valve 24 and the first control valve 25 are opened; a second one-way valve 26 and a second control valve 27 are provided on the water pipe between the external pressure supply component 3 and the lower sealing unit. When energy storage of the energy storage device 21 is required, the second one-way valve 26 and the second control valve 27 are opened.

[0038] Preferably, a vibration data collector 5 is provided on the surface of the centrifugal pump 1, as Figure 3As shown in the figure, the vibration data collector 5 is connected to the controller 6. The controller 6 is connected to the first control valve 25. The controller 6 controls the opening or closing of the first control valve 25. The controller 6 is connected to the first check valve 24. The controller 6 controls the opening degree of the first check valve 24. During the barring of the centrifugal pump 1, the vibration data collector 5 collects the vibration data of the centrifugal pump 1 to determine whether the centrifugal pump 1 is working properly. At the same time, the controller 6 adjusts the barring state of the centrifugal pump 1 in real time by opening or closing the first control valve 25 and the opening degree of the first check valve 24 (adjusting the flow rate) to further verify whether the centrifugal pump 1 is working properly.

[0039] The energy storage device works as follows: When the centrifugal pump 1 does not need to be barred, the external supply component 3 supplies pressure to the energy storage device, opens the second check valve 26 and the second control valve 27, and keeps the first check valve 24 and the first control valve 25 closed. As the amount of water entering the lower sealing unit increases, the water flow pushes the piston 22, compresses the spring (energy storage component 23), and makes the piston 22 move towards the spring fixed end. When the forces at both ends of the piston 2 are equal and it no longer moves, at this time, the pressure in the container is equal to the spring deformation force, and the water pressure in the container is equal to the water supply network system, generally 0.6 MPa - 0.8 MPa, and sufficient energy is stored. When the centrifugal pump 1 needs to be barred, the second check valve 26 and the second control valve 27 are closed, and the first check valve 24 and the first control valve 25 are kept open. The piston 22 pushes the water flow, that is, the spring (energy storage component 23) extends to release energy, and makes the piston 22 move away from the spring fixed end. When the forces at both ends of the piston 2 are equal and it no longer moves, at this time, the energy storage release is completed, and the pressure in the lower sealing unit drops from 0.6 MPa - 0.8 MPa to 0.1 - 0.2 MPa, pushing the impeller of the centrifugal pump 1 to rotate in reverse.

[0040] The controller 6 can control the energy release time of the energy storage device by controlling the opening degree of the first check valve 24. When the opening degree of the first check valve 24 is small, the energy release time is long. When the opening degree of the first check valve 24 is large, the energy release time is short.

[0041] As Figure 5 shown, a method for using a barring system of a centrifugal pump includes an energy storage step and an energy release step;

[0042] In the energy storage step S1, the external pressure supply component 3 is used to input pressurized liquid into the energy storage device 21 and store it in the energy storage device 21, so that the pressure of the liquid in the energy storage device 21 is 0.6 MPa - 0.8 MPa. The process is to open the second check valve 26 and the second control valve 27, and keep the first check valve 24 and the first control valve 25 closed;

[0043] In the energy release step S2, when barring the pump is required, the liquid stored in the energy storage device 21 is connected to the centrifugal pump 1 to reverse the rotation of the impeller of the centrifugal pump 1. The process is to close the second one-way valve 26 and the second control valve 27 and keep the first one-way valve 24 and the first control valve 25 open.

[0044] As the water pressure rushing out of the energy storage device 21 rapidly decreases from large to zero (generally within 1 minute and 10 seconds) due to the reaction force on the impeller, the reverse rotation of the shaft also quickly stops, thus completing the barring of the pump.

[0045] Such as Figure 4 shown in the figure, the external pressure supply component 3 can be a centrifugal pump 1. That is, when the centrifugal pump 1 is working normally, the second one-way valve 26 and the second control valve 27 are opened to store energy in the energy storage device 21. After the energy storage is completed, the second one-way valve 26 and the second control valve 27 are closed. When barring the pump is required, the first one-way valve 24 and the first control valve 25 are opened.

[0046] Such as Figure 6 shown, a method for using a barring system of a centrifugal pump includes an energy storage step, an energy release step, a vibration self-check step, and a current conversion self-check step.

[0047] In the energy storage step S1, the external pressure supply component 3 is used to input pressurized liquid into the energy storage device 21 and store it in the energy storage device 21, so that the pressure of the liquid in the energy storage device 21 is 0.6 MPa - 0.8 MPa. The process is to open the second one-way valve 26 and the second control valve 27 and keep the first one-way valve 24 and the first control valve 25 closed.

[0048] In the energy release step S2, when barring the pump is required, the liquid stored in the energy storage device 21 is connected to the centrifugal pump 1 to reverse the rotation of the impeller of the centrifugal pump 1. The process is to close the second one-way valve 26 and the second control valve 27 and keep the first one-way valve 24 and the first control valve 25 open.

[0049] In the vibration self-check step S3, the vibration data acquisition device 5 provided on the centrifugal pump 1 is used to collect the vibration data of the energy storage device 21 in real time. If the vibration data is greater than the set value, it is determined to be unqualified; if the vibration data is less than the set value, it is determined to be qualified. Because if the centrifugal pump 1 does not jam, it rotates normally and its vibration data is also normal. If the centrifugal pump 1 jams, it cannot rotate normally and its vibration data is lower than the normal value.

[0050] In the variable flow self-check step S4, after the vibration self-check step S3 is determined to be unqualified, the controller 6 increases the opening degree of the first one-way valve 24, increases the amount of the liquid stored in the accumulator 21 flowing into the centrifugal pump 1, that is, increases the liquid supply amount, and circulates and executes the vibration self-check step S3 again. One cycle (because the space in the accumulator 21 is limited, generally only one variable flow can be performed. Generally, the opening degree of 50% is started during the first turning of the rotor, and the opening degree of 100% is started during the second time, that is, during variable flow. The detection time is generally once every 30 seconds, and the second detection time does not exceed 60 seconds). If it is still determined to be unqualified, stop turning the rotor.

[0051] The purpose of the present invention: The water stored in the accumulator rushes into the impeller cavity of the centrifugal pump under the action of the spring force, pushing the impeller to reverse and thus driving the impeller shaft to reverse, achieving the effect of turning the rotor of the machine or manually turning the rotor. Compared with the traditional rotor turning method, it reflects the advantages of convenient control, time-saving, labor-saving and cost-saving. In addition, since there is no need for manual participation in turning the rotor, the rotor turning operation is safer.

[0052] Another accumulator can be connected to multiple centrifugal pumps. As long as the working pressure can be guaranteed, multiple centrifugal pumps can be turned by the rotor simultaneously or step by step, and the working principle and method are as shown above.

[0053] Introduce the system device into the centrifugal pump working pipe network system in a one-to-one manner. When the centrifugal pump working pipe network is working normally, open the inlet valve of the accumulator, and store a certain amount of water with energy (the storage amount is designed according to the pump model) for standby. When the target pump needs to turn the rotor before starting operation, open the outlet valve of the corresponding rotor turning system device to cause the pump to reverse, complete the rotor turning operation, and close the outlet valve. If the centrifugal pump working pipe network always maintains the normal working pressure, the inlet valve of the rotor turning system device can be opened to store energy and provide power for the next rotor turning; if the centrifugal pump working pipe network has no working pressure, other pressurized pipe networks such as fire pipelines can be introduced into the inlet of the rotor turning system device to ensure that the accumulator stores energy for the next rotor turning.

Claims

1. A barring gear system device for a centrifugal pump, characterized in that: The barring gear includes a barring component connected to the centrifugal pump. The barring component pushes the impeller of the centrifugal pump to reverse, and the reverse rotation of the impeller drives the reverse rotation of the pump shaft. The barring component includes an energy storage device. The energy storage device is connected to the centrifugal pump through a pipeline, and a liquid with pressure is contained in the energy storage device. The barring is to check whether the pump shaft is stuck, so as to avoid the motor being burned out due to the large shaft blocking force. The usage method of the barring system includes an energy storage step and an energy release step. In the energy storage step, an external pressure supply component is used to input a pressurized liquid into the energy storage device and store it in the energy storage device. In the energy release step, the liquid stored in the energy storage device is connected to the centrifugal pump to make the impeller of the centrifugal pump reverse. The barring of the centrifugal pump is completed through the above steps. The energy storage device includes a cylinder body. The cylinder body is divided into an upper sealing unit and a lower sealing unit by a built-in piston. An energy storage component is built in the upper sealing unit. One end of the energy storage component is connected to the inner top wall of the cylinder body, and the other end is connected to the piston. The lower sealing unit is a cavity, and the lower sealing unit is a container chamber for storing fluid, and the lower sealing unit is connected to the centrifugal pump. Three communication ports are provided on the lower sealing unit. One of the communication ports is connected to the external pressure supply component, and the other two communication ports are respectively connected to the centrifugal pump and a pressure gauge. A first one-way valve and a first control valve are provided on the water supply pipe between the lower sealing unit and the centrifugal pump.

2. The barring gear system device of a centrifugal pump according to claim 1, characterized in that: A second one-way valve and a second control valve are provided on the water pipe between the external pressure supply component and the lower sealing unit.

3. The barring gear system device of a centrifugal pump according to claim 1, characterized in that: A vibration data collector is provided on the surface of the centrifugal pump. The vibration data collector is connected to a controller, and the controller is connected to the first control valve. The controller controls the opening or closing of the first control valve.

4. The barring gear system device of a centrifugal pump according to claim 1, characterized in that: The pressure gauge is connected to the controller, and the controller is connected to a second control valve provided on the water pipe between the external pressure supply component and the lower sealing unit. The controller controls the opening or closing of the second control valve.

5. The barring gear system device of a centrifugal pump according to claim 3, characterized in that: The controller is connected to the first one-way valve, and the controller controls the opening degree of the first one-way valve.

6. The barring gear system device of a centrifugal pump according to claim 1, characterized in that: The usage method of the barring system further includes a vibration self-check step and a current conversion self-check step. In the vibration self-check step, the vibration data collector provided on the centrifugal pump is used to collect the vibration data of the energy storage device in real time. If the vibration data is less than the set value, it is judged as unqualified; if the vibration data is greater than the set value, it is judged as qualified. In the current conversion self-check step, after it is judged as unqualified, the amount of the liquid stored in the energy storage device flowing into the centrifugal pump is increased, and the vibration self-check step is executed again in a cycle. The cycle is performed at least once. If it is still judged as unqualified, the barring is stopped.

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