CN117703750A - Intelligent lubrication system of screw pump and control method - Google Patents
Intelligent lubrication system of screw pump and control method Download PDFInfo
- Publication number
- CN117703750A CN117703750A CN202311607852.2A CN202311607852A CN117703750A CN 117703750 A CN117703750 A CN 117703750A CN 202311607852 A CN202311607852 A CN 202311607852A CN 117703750 A CN117703750 A CN 117703750A
- Authority
- CN
- China
- Prior art keywords
- screw pump
- electric valve
- pump
- lubrication
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005461 lubrication Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004140 cleaning Methods 0.000 claims abstract description 55
- 239000010802 sludge Substances 0.000 claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000003814 drug Substances 0.000 claims description 64
- 239000000314 lubricant Substances 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000003860 storage Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 14
- 238000011010 flushing procedure Methods 0.000 claims description 12
- 230000001050 lubricating effect Effects 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 229940079593 drug Drugs 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention belongs to the technical field of sludge dewatering, and discloses an intelligent lubrication system of a screw pump and a control method. The control method is operated in a PLC, the PLC is used for judging different working conditions of the instantaneous flow of an outlet pipeline of the screw pump, the operation current of a motor of the screw pump and the frequency of the screw pump, and according to the different working conditions, different cleaning and lubrication modes are automatically selected to clean a sludge pump cavity and a stator in the screw pump without stopping. The intelligent lubrication system of the screw pump is linked with the control system of the screw pump, and the intelligent lubrication system of the screw pump is cleaned and lubricated before the screw pump is started, during operation and before shutdown, so that the screw pump is ensured to operate normally, the aim of avoiding jamming and stopping production is achieved, the lubrication system of the screw pump is increased, the intelligent lubrication system of the screw pump is further realized by timely cleaning and lubrication through real-time flow and motor operation current, the operation stability of the screw pump for conveying high-viscosity high-particulate sludge is improved, and the intelligent operation of the system is improved.
Description
Technical Field
The invention belongs to the technical field of sludge dewatering, and particularly relates to an intelligent lubrication system of a screw pump and a control method.
Background
At present, a sludge dewatering system adopts a screw pump to convey concentrated sludge in a sludge homogenizing pool to a dewatering machine for sludge dewatering treatment.
The screw pump conveys sludge from an inlet to an outlet of the pump by rotation of the screw. Inside the pump body, the screw is driven by a motor to rotate. When the screw rotates, the sludge is grasped by the blades or spiral lines of the screw and gradually advances as the screw rotates. During the pushing process, the pressure of the pump is gradually increased, so that the sludge is smoothly conveyed out.
Sludge screw pumps have many advantages, mainly in the following aspects. First, it is suitable for transporting various types of sludge, including high concentration sludge, high viscosity sludge. And secondly, the sewage treatment device has higher pressure and flow, and can meet the requirements of various sewage treatment systems. In addition, the sludge screw pump also has self-sucking capacity, so that sludge can be conveniently sucked into the pump body without additional suction equipment.
As the screw pump grabs and extrudes sludge through the screw blades, the rotation resistance of the screw blades is increased after the sludge containing particles enters the cavity, and the high-viscosity sludge is mixed with excessive particles to cause serious influence on the rotation of the screw, so that the screw blades and the cavity are blocked, the motor is overloaded to cause the screw pump to stop due to the fault of the screw pump, and the sludge dewatering process is stopped.
Through the above analysis, the problems and defects existing in the prior art are as follows: the prior art can not automatically select a flushing pipeline mode without stopping according to the actual operation condition in production, can not reduce the time of stopping due to high sludge concentration, can not save the labor cost of a dehydrator, and can not realize unattended operation.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiment of the invention discloses an intelligent lubrication system and a control method of a screw pump.
The technical scheme is as follows: a control method of an intelligent lubrication system of a screw pump operates on a PLC, judges different working conditions of instantaneous flow of an outlet pipeline of the screw pump, running current of a motor of the screw pump and frequency of the screw pump through the PLC, and automatically selects different cleaning lubrication modes to clean a sludge pump cavity and a stator in the screw pump without stopping according to the different working conditions.
Further, the different cleaning lubrication modes include a pre-start lubrication mode, the pre-start lubrication mode including:
before a motor of the screw pump needs to be started by running a sludge dewatering process, a lubricant storage tank and an ultrasonic liquid level meter are monitored in real time to detect whether lubricant exists or not, PE pipes entering a pipeline of the screw pump by gravity flow are lubricated, a PLC detects the on-off states of a sludge feeding electric valve of the screw pump and a sludge feeding electric valve of the screw pump before the screw pump is started, and when the sludge feeding electric valve of the screw pump and the sludge feeding electric valve of the screw pump are in a fully-closed position, a lubrication mode before the screw pump is started.
Further, the corresponding screw pump medicine feeding electric valve, the screw pump medicine returning electric valve and the delay time are 30 seconds, so that the lubricant is filled in the pipeline, the screw pump is started, when the frequency of a motor of the screw pump is higher than 20hz, the screw pump medicine feeding electric valve and the screw pump medicine returning electric valve are closed, and the screw pump mud feeding electric valve and the screw pump mud pumping electric valve are opened. The lubrication function before starting is completed.
Further, the different wash lubrication modes include a low resistance wash lubrication mode; the instantaneous flow rate of the outlet pipeline is lower than 25m when the screw pump motor is in operation 3 And/h or the running current of the screw pump motor is 10.5A higher than the normal working current, judging that the resistance in the cavity of the screw pump is increased by the PLC, and performing a low-resistance cleaning lubrication mode.
Further, the screw pump continues to run, the screw pump mud feeding electric valve is closed, the screw pump water feeding electric valve is opened, the screw pump discharging electric valve is opened, service water cleaning is carried out on the screw pump cavity and the stator and rotor, the emptying valve is opened to remove the blocking particles in the cavity, the current of the screw pump motor is smaller than 10.5A, and the flow is larger than 25m 3 And (3) closing the water inlet electric valve and the exhaust valve of the screw pump to finish a low-resistance cleaning mode.
Further, if the current and the flow rate are not restored to the normal working condition after the flushing for 5 minutes, the water inlet electric valve of the screw pump is closed; entering a high-resistance cleaning lubrication mode;
if the resistance increases again after 8 minutes after the flushing is completed, the flow is below 25m 3 And/h or the running current of the screw pump motor is 10.5A higher than the normal working current, and the screw pump motor directly enters a high-resistance cleaning lubrication mode.
Further, the different cleaning and lubrication modes comprise a high-resistance cleaning and lubrication mode, when the current rise of the screw pump motor is more than or equal to 10.5A and the flow is lower than 25m 3 And/h, directly entering a high-resistance cleaning lubrication mode.
Further, the screw pump mud feeding electric valve and the screw pump mud pumping electric valve are closed, the screw pump medicine feeding electric valve and the drain valve are opened to flush the inside of the screw pump, the drain valve is closed after the discharge for 2 minutes, the screw pump medicine returning electric valve is opened, and the lubricant is recovered; the current rise of the screw pump motor is more than 10.5A and the flow is less than 25m 3 And (3) when the high-resistance cleaning and lubricating mode is finished, closing the screw pump medicine feeding electric valve and the screw pump medicine returning electric valve, opening the screw pump mud feeding electric valve and the screw pump mud pumping electric valve, and recovering normal production;
if the current and the flow are not restored to the normal working condition after the flushing for 10 minutes, the stator temperature of the screw pump is higher than 60 ℃, and the screw pump is immediately stopped for alarming.
Further, the different cleaning and lubrication modes comprise a shutdown cleaning and lubrication mode, and when the sludge dewatering process is finished, the shutdown cleaning and lubrication mode is carried out before the screw pump is stopped;
the screw pump continues to run, the liquid level of the medicine storage tank of the lubricating system meets the feeding requirement, the electric valve of the feed pump is closed, the electric valve of the feed pump is opened, the pump is flushed for 5 minutes, service water is firstly used for cleaning the sludge in the pump body and the pipeline, then the electric valve of the feed pump is closed, the electric valve of the feed pump and the electric valve of the return pump are opened, a lubricant lubricating mode is entered, and after 10 minutes of lubrication, the electric valves of the feed pump and the return pump are closed, so that a shutdown cleaning mode is completed.
The invention further aims to provide an intelligent lubrication system of the screw pump, which comprises a first screw pump and a second screw pump which are independently operated in parallel, wherein a first screw pump motor is arranged in the first screw pump; a second screw pump motor is arranged in the second screw pump;
the first screw pump is connected with an outlet hand valve of the lubricant medicine tank through a first screw pump medicine feeding electric valve;
the second screw pump is connected with an outlet hand valve of the lubricant medicine tank through a second screw pump medicine feeding electric valve;
the lubricant medicine tank outlet hand valve is communicated with the lubricant medicine storage tank through a PE pipe;
an ultrasonic liquid level meter for detecting the liquid level of the lubricant is arranged in the lubricant storage tank;
the upper part of the first screw pump is respectively communicated with a first screw pump water inlet electric valve and a first screw pump mud inlet electric valve;
the lower part of the first screw pump is respectively communicated with a first screw pump discharge electric valve and a first screw pump medicine return electric valve;
the first screw pump medicine return electric valve is connected with the lubricant storage tank through a PE pipe;
the first screw pump discharge electric valve is connected with a first discharge pipe flow switch;
the bottom of the first screw pump is connected with a first screw pump mud outlet electric valve;
the first screw pump mud outlet electric valve is connected with the flowmeter through a PE pipe;
the upper part of the second screw pump is respectively communicated with a second screw pump water inlet electric valve and a second screw pump mud inlet electric valve;
the lower part of the second screw pump is respectively communicated with a second screw pump discharge electric valve and a second screw pump medicine return electric valve;
the second screw pump medicine return electric valve is connected with the lubricant storage tank through a PE pipe;
the second screw pump discharge electric valve is connected with a second discharge pipe flow switch;
the bottom of the second screw pump is connected with a second screw pump mud outlet electric valve;
the second screw pump mud outlet electric valve is connected with the flowmeter through a PE pipe;
except PE tubular product, all other parts of screw pump intelligent lubrication system all pass through signal line connection PLC.
By combining all the technical schemes, the invention has the advantages and positive effects that:
the intelligent screw pump lubrication system provided by the invention can be used for judging working conditions such as instantaneous flow of a screw pump outlet pipeline, running current of a screw pump motor, screw pump frequency and the like, and an automatic control system automatically selects a corresponding mode to clean a sludge pump cavity and a stator and a rotor through judging the working conditions, wherein the intelligent screw pump lubrication system comprises a pre-starting lubrication mode, a low-resistance cleaning lubrication mode, a high-resistance cleaning lubrication mode and a shutdown cleaning lubrication mode. According to the invention, the automatic selection of the flushing pipeline mode without stopping the machine according to the running condition in production can be realized, the time of stopping the machine due to high sludge concentration is reduced, meanwhile, the production personnel of the dehydrator are saved, and the unattended operation is realized.
Advantages of the present invention compared to the prior art further include:
the intelligent lubrication system of the screw pump is linked with the control system of the screw pump, and the intelligent lubrication system of the screw pump is cleaned and lubricated before the screw pump is started, during operation and before shutdown, so that the screw pump is ensured to operate normally, the aim of avoiding jamming and stopping production is achieved, the lubrication system of the screw pump is increased, the intelligent lubrication system of the screw pump is further realized by timely cleaning and lubrication through real-time flow and motor operation current, the operation stability of the screw pump for conveying high-viscosity high-particulate sludge is improved, and the intelligent operation of the system is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure;
FIG. 1 is a diagram of an intelligent lubrication system and a control method of a screw pump according to an embodiment of the present invention;
FIG. 2 is a graph of rod pump performance provided by an embodiment of the present invention;
FIG. 3 is a flow chart of a pre-start lubrication mode provided by an embodiment of the present invention;
FIG. 4 is a flow chart of a high resistance purge lubrication mode provided by an embodiment of the present invention;
FIG. 5 is a flow chart of a shutdown cleaning lubrication mode provided by an embodiment of the present invention;
in the figure: 1. a lubricant reservoir; 2. an ultrasonic liquid level meter; 3. a first drain pipe flow switch; 4. PE pipe; 5. a flow meter; 6. a first screw pump medicine feeding electric valve; 7. a second screw pump medicine feeding electric valve; 8. a first screw pump drug return electric valve; 9. a second screw pump drug return electric valve; 10. a first screw pump water inlet electric valve; 11. a second screw pump water inlet electric valve; 12. a first screw pump discharge electric valve; 13. a second screw pump discharge electric valve; 14. a first screw pump mud feeding electric valve; 15. a second screw pump mud feeding electric valve; 16. a first screw pump mud pumping electric valve; 17. a second screw pump mud pumping electric valve; 18. a first screw pump; 19. a second screw pump; 20. a first screw pump motor; 21. a second screw pump motor; 22. a lubricant canister outlet hand valve; 23. and a second drain flow switch.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
The intelligent lubrication system and the control method for the screw pump provided by the embodiment of the invention have the innovation points that: the intelligent lubrication system of the screw pump optimizes the hardware pipeline part, the automatic operation, the energy conservation, the consumption reduction and the like on the basis of the original mud feeding system of the screw pump. The flushing mode is automatically selected according to different conditions by monitoring the current, frequency, flow and temperature of the screw pump.
On the basis of the original screw pump sludge conveying system, the automatic lubrication system is added, parameters such as the running current of a screw pump motor, the temperature of a cavity stator, the flow of a sludge outlet and the like are monitored, service water is intervened in time to remove small-particle-size particles, the concentration of sludge colloid is reduced, and the flow resistance is reduced. After cleaning, lubricant is added to fully contact with large-particle-size particles, so that the surface resistance of the sludge particles is reduced, the fluidity of the sludge in a cavity of the screw pump is improved, and the stable operation of the screw pump is ensured.
In the embodiment 1, the original screw pump feeding system consists of a screw pump, a screw pump mud feeding electric valve, a screw pump mud pumping electric valve and a low-voltage electric control system.
Two ends of the mud inlet electric valve are respectively connected with a mud storage tank pipeline and a screw pump inlet, the pipeline is made of 304 stainless steel, and the connection mode is connected by a flange bolt mode.
The main components of the screw pump are a motor, a pump body, a rubber stator and an eccentric screw rotor, a motor driving shaft is connected with the eccentric screw rotor, sludge enters through a pump body feeding port, the motor drives the eccentric screw rotor to rotate, and the eccentric screw rotor and the rubber stator form a spiral conveying structure to push the sludge to a pump body discharging port.
The pump body feed inlet is communicated with the mud inlet electric valve through a stainless steel pipeline, and the pump body discharge outlet is communicated with the mud outlet electric valve through a stainless steel pipeline.
The two ends of the mud outlet electric valve are respectively connected with a screw pump outlet and a mud output pipeline, the pipeline is made of 304 stainless steel, and the connection mode is connected by a flange bolt mode.
As shown in fig. 1, the intelligent lubrication system for the screw pump provided by the embodiment of the invention comprises a first screw pump 18 and a second screw pump 19 which are independently operated in parallel, wherein a first screw pump motor 20 is installed inside the first screw pump 18; a second screw pump motor 21 is arranged in the second screw pump 19;
the first screw pump 18 is connected with a lubricant medicine tank outlet hand valve 22 through a first screw pump medicine feeding electric valve 6;
the second screw pump 19 is connected with a lubricant medicine tank outlet hand valve 22 through a second screw pump medicine feeding electric valve 7;
the lubricant medicine tank outlet hand valve 22 is communicated with the lubricant medicine tank 1 through a PE pipe 4 (DN 32);
an ultrasonic liquid level meter 2 for detecting the liquid level of the lubricant is arranged in the lubricant storage tank 1;
the upper part of the first screw pump 18 is respectively communicated with a first screw pump water inlet electric valve 10 and a first screw pump mud inlet electric valve 14;
the lower part of the first screw pump 18 is respectively communicated with a first screw pump discharge electric valve 12 and a first screw pump medicine return electric valve 8;
the first screw pump drug return electric valve 8 is connected with the lubricant storage tank 1 through the PE pipe 4;
the first screw pump discharge electric valve 12 is connected with a first discharge pipe flow switch 3;
the bottom of the first screw pump 18 is connected with a first screw pump mud outlet electric valve 16;
the first screw pump mud outlet electric valve 16 is connected with the flowmeter 5 through the PE pipe 4;
in the embodiment of the invention, the upper part of the second screw pump 19 is respectively communicated with a second screw pump water inlet electric valve 11 and a second screw pump mud inlet electric valve 15;
the lower part of the second screw pump 19 is respectively communicated with a second screw pump discharge electric valve 13 and a second screw pump medicine return electric valve 9;
the second screw pump drug return electric valve 9 is connected with the lubricant storage tank 1 through the PE pipe 4;
the second screw pump discharge electric valve 13 is connected with a second discharge pipe flow switch 23;
the bottom of the second screw pump 19 is connected with a second screw pump mud outlet electric valve 17;
the second screw pump mud outlet electric valve 17 is connected with the flowmeter 5 through the PE pipe 4;
except for PE pipe 4, all other parts of the intelligent lubrication system of the screw pump are connected with a PLC through signal lines.
In embodiment 2, the original screw pump mud feeding system is a fixed-frequency mud feeding system. The screw pump is started and stopped manually, and the screw pump operates at a constant frequency.
According to the control method of the intelligent lubrication system of the screw pump, provided by the embodiment of the invention, an independently-operated PLC automatic control system is added, the system is used for receiving a liquid level meter signal by the PLC to monitor the lubricant storage in real time and monitoring a screw pump discharge electric valve by a flow switch, a main pipe flowmeter signal is used for feeding back the running condition of the screw pump and the viscosity of sludge in real time, and the screw pump return electric valve can be used for recovering the lubricant and saving the medicament. The mud feeding electric valve of the screw pump and the mud pumping electric valve of the screw pump can rapidly cut off mud management.
The invention adds four cleaning and lubricating functions on the original fixed frequency mode of the screw pump. At 7.5kw, 40m 3 For example, a screw pump with a pressure of 2bar and a rotational speed of 256r/min, such as the screw pump performance curve 2, is shown in Table 1.
TABLE 1
The embodiment of the invention provides a control method of an intelligent lubrication system of a screw pump, which is operated on a PLC, and judges different working conditions of instantaneous flow of an outlet pipeline of the screw pump, running current of a motor of the screw pump and frequency of the screw pump through the PLC, and according to the different working conditions, different cleaning and lubrication modes are automatically selected to clean a sludge pump cavity and a stator and a rotor in the screw pump without stopping.
In an embodiment of the present invention, the different cleaning lubrication modes include:
mode one: the pre-start lubrication mode is shown in fig. 3.
And before the motor of the screw pump is started by the sludge dewatering process, the intelligent lubrication system of the screw pump is operated. 400L lubricant medicine storage tank 1, ultrasonic wave level gauge 2 real-time supervision have the lubricant, prevent to appear not having the dry grinding condition of liquid in the operation, lubricate by gravity flow entering screw pump pipeline (PE tubular product 4), before the start PLC detects screw pump advances mud motorised valve and screw pump and advances mud motorised valve on-off state, and screw pump advances mud motorised valve and screw pump and advance mud motorised valve and be in the totally closed position, satisfies the lubrication condition before the start.
And opening the corresponding screw pump medicine feeding electric valve, the screw pump medicine returning electric valve, delaying for 30 seconds, filling the pipeline with lubricant, starting the screw pump, closing the screw pump medicine feeding electric valve and the screw pump medicine returning electric valve when the frequency of a screw pump motor is higher than 20hz, and opening the screw pump mud feeding electric valve and the screw pump mud pumping electric valve. The lubrication function before starting is completed.
Mode two: a low resistance purge lubrication mode;
during the operation of the screw pump motor, the set frequency is 30hz, and the outlet flow under the normal working condition is about 24m under the normal working condition 3 And/h, a current of about 8.4. The actual running condition is calculated by a PLC, and the instantaneous flow of the outlet pipeline is lower than 21m 3 And/h (90% of normal working condition) or the running current of the screw pump motor is 9A (the current is 8% higher than that of the normal working condition), the PLC judges that the resistance in the cavity of the screw pump is increased, and lubrication is needed, namely a low-resistance cleaning lubrication mode is carried out.
Performing the low resistance purge lubrication mode includes: the screw pump continues to run, the screw pump mud feeding electric valve is closed, the screw pump water feeding electric valve is opened, the screw pump discharging electric valve is opened, service water cleaning is carried out on the screw pump cavity and the stator and rotor, the emptying valve is opened to remove blocking particles in the cavity, and the instantaneous flow of an outlet pipeline of a screw pump motor is lower than 21m 3 And/h, the running current of the screw pump motor is 9A, and the water inlet electric valve and the exhaust valve of the screw pump are closed to complete the low-resistance cleaning mode.
If the current and the flow rate are not restored to the normal working condition after 5 minutes of flushing, the screw pump water inlet electric valve is closed. And entering a high-resistance cleaning lubrication mode.
If the resistance rises again after 8 minutes after the flushing is finished, the instantaneous flow of the outlet pipeline of the screw pump motor is lower than 21m 3 And/h or the running current of the screw pump motor is 9A, and the screw pump motor directly enters a high-resistance cleaning and lubricating mode.
Mode three: a high resistance purge lubrication mode, as shown in fig. 4;
the instantaneous flow of the outlet pipeline of the screw pump motor is lower than 21m 3 And/h, the running current of the screw pump motor is 9A, and the screw pump motor directly enters a high-resistance cleaning and lubricating mode.
The high resistance wash lubrication mode includes: and closing the screw pump mud feeding electric valve and the screw pump mud discharging electric valve, opening the screw pump medicine feeding electric valve and the emptying valve to flush the inside of the screw pump, closing the emptying valve after discharging for 2 minutes, opening the screw pump medicine returning electric valve, and recycling the lubricant. The current rise of the screw pump motor is more than 10.5A and the flow is less than 25m 3 And (3) when the high-resistance cleaning lubrication mode is finished, closing the screw pump medicine feeding electric valve and the screw pump medicine returning electric valve, opening the screw pump mud feeding electric valve and the screw pump mud pumping electric valve, and recovering normal production.
If after 10 minutes of flushing, the current and flow are not restored to normal conditions and the screw pump stator temperature is greater than 60 degrees. And immediately stopping the machine to give an alarm, and further checking the screw pump.
Mode four: and (5) stopping the machine to clean the lubrication mode. As shown in fig. 5;
and when the sludge dewatering process is finished, stopping the screw pump, and cleaning and lubricating the screw pump before stopping the screw pump.
The screw pump continues to run, the liquid level of the medicine storage tank of the lubricating system meets the feeding requirement, the electric valve of the feed pump is closed, the electric valve of the feed pump is opened, the pump is flushed for 5 minutes, service water is firstly used for cleaning the sludge in the pump body and the pipeline, then the electric valve of the feed pump is closed, the electric valve of the feed pump and the electric valve of the return pump are opened, a lubricant lubricating mode is entered, and after 10 minutes of lubrication, the electric valves of the feed pump and the return pump are closed, so that a shutdown cleaning mode is completed.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
From the above examples, it can be seen that in terms of production: the invention ensures the continuity of the operation of the screw pump, reduces the overhaul time of the pump stopping caused by the blocking of the sludge and provides reliable guarantee for the continuous operation of the sludge dewatering system; a step of
In terms of equipment maintenance cost: the running resistance of the screw pump rotor is reduced through the intelligent lubrication system, the mechanical seal blocking pressure is reduced, the service lives of the rotor, the mechanical seal and the bearing are prolonged, and the design is prolonged from 3 years to 6 years; the maintenance cost of 2 screw pumps is saved by about 7 ten thousand yuan each year.
The screw pump is applied to a conveying system containing solid media, and forms a sealing cavity which is not communicated with each other by means of interference fit between a rotor which does eccentric motion and a stator which is fixed, and the sealing cavity moves from an inlet end to an outlet end of the pump along the axial direction by rotating the rotor in the stator, so that the media in the sealing cavity realize the continuous conveying process. However, a large amount of inorganic particles jammed between the rotors and the stators can cause overload of the motor and can not be operated, the intelligent lubrication system of the screw pump fills the technical blank that the screw pump can not be operated continuously due to the jam of the operation, and the resistance of the screw pump is reduced by intelligent judgment of the resistance of the screw pump, so that the screw pump can be ensured to be operated continuously.
While the invention has been described with respect to what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. A control method of an intelligent lubrication system of a screw pump is characterized in that the method is operated in a PLC, the PLC is used for judging different working conditions of instantaneous flow of an outlet pipeline of the screw pump, running current of a motor of the screw pump and frequency of the screw pump, and according to the different working conditions, different cleaning and lubrication modes are automatically selected to clean a sludge pump cavity and a stator in the screw pump without stopping the machine.
2. The method for controlling an intelligent lubrication system of a screw pump according to claim 1, wherein the different cleaning lubrication modes comprise a pre-start lubrication mode, when a sludge dewatering process needs to be operated before a screw pump motor is started, a lubricant storage tank and an ultrasonic liquid level meter are monitored in real time for the presence or absence of lubricant, PE pipes entering a screw pump pipeline by gravity flow are lubricated, a PLC detects the on-off states of a screw pump mud inlet electric valve and a screw pump mud inlet electric valve before the screw pump is started, and when the screw pump mud inlet electric valve and the screw pump mud inlet electric valve are in a fully closed position, the pre-start lubrication mode is started.
3. The control method of the intelligent lubrication system of the screw pump according to claim 2, wherein the corresponding screw pump medicine feeding electric valve, the screw pump medicine returning electric valve and the delay time are 30 seconds, so that the lubricant is filled in the pipeline, the screw pump is started, when the frequency of a motor of the screw pump is higher than 20hz, the screw pump medicine feeding electric valve and the screw pump medicine returning electric valve are closed, the screw pump mud feeding electric valve and the screw pump mud pumping electric valve are opened, and the lubrication function before starting is completed.
4. The control method of the intelligent lubrication system of the screw pump according to claim 2, wherein the different cleaning lubrication modes further include a low resistance cleaning lubrication mode; the instantaneous flow rate of the outlet pipeline is lower than 25m when the screw pump motor is in operation 3 And/h or the running current of the screw pump motor is 10.5A higher than the normal working current, judging that the resistance in the cavity of the screw pump is increased by the PLC, and performing a low-resistance cleaning lubrication mode.
5. The method for controlling an intelligent lubrication system of a screw pump according to claim 4, wherein the screw pump continues to operate, a screw pump mud-feeding electric valve is closed, a screw pump water-feeding electric valve is opened, a screw pump discharge electric valve is opened, service water cleaning is performed on a screw pump chamber and a stator and a rotor, a discharge valve is opened to remove stuck particles in the chamber, and a screw pump motor current is less than 10.5A and a flow is greater than 25m 3 And (3) closing the water inlet electric valve and the exhaust valve of the screw pump to finish a low-resistance cleaning mode.
6. The control method of the intelligent lubrication system of the screw pump according to claim 4, wherein if the current and the flow rate are not restored to the normal working conditions after the flushing for 5 minutes, the water inlet electric valve of the screw pump is closed; entering a high-resistance cleaning lubrication mode;
if the resistance increases again after 8 minutes after the flushing is completed, the flow is below 25m 3 And/h or the running current of the screw pump motor is 10.5A higher than the normal working current, and the screw pump motor directly enters a high-resistance cleaning lubrication mode.
7. The control method of intelligent lubrication system according to claim 1, wherein the different cleaning lubrication modes include a high resistance cleaning lubrication mode when the current rise of the screw pump motor is 10.5A or more and the flow rate is lower than 25m 3 And/h, directly entering a high-resistance cleaning lubrication mode.
8. The control method of the intelligent lubrication system of the screw pump according to claim 7, wherein the screw pump mud feeding electric valve and the screw pump mud feeding electric valve are closed, the screw pump medicine feeding electric valve and the drain valve are opened to flush the inside of the screw pump, the drain valve is closed after the screw pump medicine feeding electric valve and the drain valve are discharged for 2 minutes, the screw pump medicine returning electric valve is opened, and the lubricant is recovered; the current rise of the screw pump motor is more than 10.5A and the flow is less than 25m 3 And (3) when the high-resistance cleaning and lubricating mode is finished, closing the screw pump medicine feeding electric valve and the screw pump medicine returning electric valve, opening the screw pump mud feeding electric valve and the screw pump mud pumping electric valve, and recovering normal production;
if the current and the flow are not restored to the normal working condition after the flushing for 10 minutes, the stator temperature of the screw pump is higher than 60 ℃, and the screw pump is immediately stopped for alarming.
9. The control method of the intelligent lubrication system of the screw pump according to claim 1, wherein the different cleaning and lubrication modes include a shutdown cleaning and lubrication mode, and the shutdown cleaning and lubrication mode is performed before the screw pump is stopped when the sludge dewatering process is completed;
the screw pump continues to run, the liquid level of the medicine storage tank of the lubricating system meets the feeding requirement, the electric valve of the feed pump is closed, the electric valve of the feed pump is opened, the pump is flushed for 5 minutes, service water is firstly used for cleaning the sludge in the pump body and the pipeline, then the electric valve of the feed pump is closed, the electric valve of the feed pump and the electric valve of the return pump are opened, a lubricant lubricating mode is entered, and after 10 minutes of lubrication, the electric valves of the feed pump and the return pump are closed, so that a shutdown cleaning mode is completed.
10. A screw pump intelligent lubrication system, characterized in that the system is applied to the control method of the screw pump intelligent lubrication system according to any one of claims 1 to 9, the system comprising: the device comprises a first screw pump (18) and a second screw pump (19) which are independently operated in parallel, wherein a first screw pump motor (20) is arranged in the first screw pump (18); a second screw pump motor (21) is arranged in the second screw pump (19);
the first screw pump (18) is connected with a lubricant medicine tank outlet hand valve (22) through a first screw pump medicine feeding electric valve (6);
the second screw pump (19) is connected with a lubricant medicine tank outlet hand valve (22) through a second screw pump medicine feeding electric valve (7);
the lubricant medicine tank outlet hand valve (22) is communicated with the lubricant medicine storage tank (1) through the PE pipe (4);
an ultrasonic liquid level meter (2) for detecting the liquid level of the lubricant is arranged in the lubricant storage tank (1);
the upper part of the first screw pump (18) is respectively communicated with a first screw pump water inlet electric valve (10) and a first screw pump mud inlet electric valve (14);
the lower part of the first screw pump (18) is respectively communicated with a first screw pump discharge electric valve (12) and a first screw pump medicine return electric valve (8);
the first screw pump drug return electric valve (8) is connected with the lubricant storage tank (1) through the PE pipe (4);
the first screw pump discharge electric valve (12) is connected with a first discharge pipe flow switch (3);
the bottom of the first screw pump (18) is connected with a first screw pump mud outlet electric valve (16);
the first screw pump mud outlet electric valve (16) is connected with the flowmeter (5) through the PE pipe (4);
the upper part of the second screw pump (19) is respectively communicated with a second screw pump water inlet electric valve (11) and a second screw pump mud inlet electric valve (15);
the lower part of the second screw pump (19) is respectively communicated with a second screw pump discharge electric valve (13) and a second screw pump medicine return electric valve (9);
the second screw pump drug return electric valve (9) is connected with the lubricant storage tank (1) through the PE pipe (4);
the second screw pump discharge electric valve (13) is connected with a second discharge pipe flow switch (23);
the bottom of the second screw pump (19) is connected with a second screw pump mud outlet electric valve (17);
the second screw pump mud outlet electric valve (17) is connected with the flowmeter (5) through the PE pipe (4);
except for PE pipe (4), all other parts of the intelligent lubrication system of the screw pump are connected with a PLC through signal lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311607852.2A CN117703750A (en) | 2023-11-29 | 2023-11-29 | Intelligent lubrication system of screw pump and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311607852.2A CN117703750A (en) | 2023-11-29 | 2023-11-29 | Intelligent lubrication system of screw pump and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117703750A true CN117703750A (en) | 2024-03-15 |
Family
ID=90148908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311607852.2A Pending CN117703750A (en) | 2023-11-29 | 2023-11-29 | Intelligent lubrication system of screw pump and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117703750A (en) |
-
2023
- 2023-11-29 CN CN202311607852.2A patent/CN117703750A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6241485B1 (en) | Wastewater flow control system | |
| CN113586460B (en) | Wear-resistant sewage self-priming pump | |
| CN1916426A (en) | Intelligent pump set matched to new sewage treatment facility | |
| CN102198345A (en) | Integrated restaurant-kitchen garbage treatment machine | |
| CN110170383A (en) | A kind of intelligence horizontal screw machine operation control system and method | |
| CN114308416A (en) | Intelligent control device and method for horizontal screw centrifuge | |
| CN208311059U (en) | Vacuum aided self priming pump | |
| CN117703750A (en) | Intelligent lubrication system of screw pump and control method | |
| US6470925B2 (en) | Vacuum system | |
| CN208057402U (en) | Environmentally friendly sump oil water recovery device | |
| CN219636964U (en) | Oil-water separator for kitchen sewage treatment | |
| CN208669564U (en) | Pump energy saving control system | |
| CN200943586Y (en) | Matched intelligence set of sewage treatment device | |
| CN108626115A (en) | Environmentally friendly sump oil water recovery device | |
| CN201381973Y (en) | Autocontrol energy-saving emulsion liquid pumping plant | |
| CN212272556U (en) | Lift pump for wastewater treatment | |
| CN211174652U (en) | Submerged pump capable of preventing idle rotation | |
| CN217655467U (en) | Closed-cooling water energy-saving operation system of power plant | |
| CN209976773U (en) | External automatic cleaning device of screw pump and screw pump system comprising same | |
| CN117566351B (en) | Anti-caking screw conveyor | |
| CN220415713U (en) | Water diversion device of centrifugal pump | |
| CN213835557U (en) | Full-automatic intelligent sodium hypochlorite generator | |
| CN218078415U (en) | Three-phase centrifuge | |
| CN217838446U (en) | Oil scraping device of oil-water separator | |
| CN110985886B (en) | Automatic flow control device for liquid loading in multiple parking spaces |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |