CN107288916B - Method for reducing blocking of canned motor pump and canned motor pump - Google Patents
Method for reducing blocking of canned motor pump and canned motor pump Download PDFInfo
- Publication number
- CN107288916B CN107288916B CN201710711712.8A CN201710711712A CN107288916B CN 107288916 B CN107288916 B CN 107288916B CN 201710711712 A CN201710711712 A CN 201710711712A CN 107288916 B CN107288916 B CN 107288916B
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- pump
- motor
- controller
- time
- canned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
Abstract
The application relates to a method for reducing blocking of a canned motor pump and a canned motor pump, wherein the method for reducing blocking of the canned motor pump comprises the following steps: s1: detecting whether the shielding pump is in a shutdown state, if so, starting to record shutdown time t1; s2: when T1 is more than or equal to T1, starting the shielding pump, and starting to record the operation time T2 of the shielding pump; s3: when T2 is more than or equal to T2, closing the shielding pump, resetting the timing, and returning to the step S1; wherein, T1 presets downtime, and T2 presets run time. According to the application, after the shielding pump is stopped for a preset time, the shielding pump can be started for a preset time, the temperature of the fluid medium is raised through self-heating, so that impurities in the fluid medium are looser, the internal impurities are ground into suspended matters dissolved in the fluid medium through high-speed rotation of the rotor of the shielding pump, and finally, the suspended matters are discharged through the pressure difference of the internal flow channel of the shielding pump, so that the excessive impurity precipitation in the shielding pump is prevented, and the blocking of the shielding pump is reduced.
Description
Technical Field
The application relates to the field of pumping systems, in particular to a method for reducing blocking of a canned motor pump and the canned motor pump.
Background
The shielding type water pump has the advantage of silence, is very suitable for being used in a household air conditioner indoor unit, and has good user experience. However, the canned motor pump belongs to wet rotor pump, and the requirement is higher to the working medium. After the canned motor pump is started, the canned motor pump can continuously run for a long time without being blocked. The occurrence of the blocking is usually when the machine is stopped for a long time and is electrified again for restarting, and the starting moment cannot overcome the friction moment and cannot be started.
The cause of the jamming is mainly three kinds of: 1) The impurity particles in the medium enter and are condensed into blocks, and the blocks are filled into the runner gaps of the shielding sleeve, so that the shielding pump is blocked; 2) Because the motor rotor uses a medium for cooling and radiating, the medium with higher hardness is easy to separate out scale on the motor rotor, so that the gap of a runner is reduced, and finally, the blockage occurs; 3) When the medium has high conductivity and strong corrosiveness, the metal parts in the medium are easy to expand after being corroded, and the flow channel is blocked.
Disclosure of Invention
The application aims to provide a method for reducing blocking of a shielding pump and the shielding pump, which can effectively reduce blocking of the shielding pump.
To achieve the above object, the present application provides a method for reducing the seizing of a canned pump, comprising the steps of:
s1: detecting whether the shielding pump is in a shutdown state, if so, starting to record shutdown time t1;
s2: when T1 is more than or equal to T1, starting the shielding pump, and starting to record the operation time T2 of the shielding pump;
s3: when T2 is more than or equal to T2, closing the shielding pump, resetting the timing, and returning to the step S1;
wherein, T1 presets downtime, and T2 presets run time.
In a preferred or alternative embodiment, in step S2, if the canned motor pump is turned on when T1 < T1, the timer is cleared, and the process returns to step S1.
In a preferred or alternative embodiment, the preset downtime t1=t11×n, where T11 is the time of one preset downtime period and N is the number of preset downtime periods.
In a preferred or alternative embodiment, the preset downtime T1 is in the range of 2 days to 3 days.
In a preferred or alternative embodiment, the preset running time t2=t21+t22, where T21 is the steady output time of the canned motor pump; t22 is the motor thermal settling time of the canned pump.
In a preferred or alternative embodiment, the steady output time T21 of the canned motor pump is in the range of 3 minutes to 5 minutes.
In a preferred or alternative embodiment, the motor thermal stability time T22 of the canned motor pump ranges from 0.5 hours to 1 hour.
To achieve the above object, the present application provides a canned motor pump including a motor, a detecting element, a timing element, and a controller; the controller is electrically connected with the detection element, the timing element and the motor;
the detection element is arranged on the motor and used for detecting whether the motor is in a stop state or not, and sending a signal to the controller when the motor is in the stop state, and the controller is used for controlling the timing element to start recording the stop time t1;
the timing element is used for sending a signal to the controller when the shutdown time T1 of the motor is more than or equal to T1, and the controller is used for controlling the motor to be started and simultaneously controlling the timing element to start recording the operation time T2 of the motor;
the timing element is used for sending a signal to the controller when the starting-up running time T2 of the motor is more than or equal to T2, and the controller is used for controlling the motor to be closed and simultaneously controlling the timing of the timing element to be cleared;
wherein, T1 presets downtime, and T2 presets run time.
In a preferred or alternative embodiment, when the detecting element sends a stop signal to the controller and the controller does not receive the signal sent by the timing element to reach the preset stop time, if the detecting element detects that the motor is turned on, a signal is sent to the controller, and the controller controls the timing of the timing element to be cleared.
In a preferred or alternative embodiment, the preset downtime t1=t11×n in the controller, where T11 is the time of one preset downtime period and N is the number of preset downtime periods.
In a preferred or alternative embodiment, the preset downtime T1 in the controller ranges from 2 days to 3 days.
In a preferred or alternative embodiment, the preset running time t2=t21+t22 in the controller, where T21 is the time for which the canned pump is stably outputting; t22 is the motor thermal settling time of the canned pump.
In a preferred or alternative embodiment, the steady output time T21 of the canned motor pump within the controller ranges from 3 minutes to 5 minutes.
In a preferred or alternative embodiment, the motor thermal stability time T22 of the canned motor pump within the controller ranges from 0.5 hours to 1 hour.
Based on the technical scheme, the application has at least the following beneficial effects:
according to the application, after the shielding pump is stopped for a preset time, the shielding pump can be started for a preset time, so that the temperature of a fluid medium can be raised through self-heating of the shielding pump, impurities in the fluid medium are looser, internal impurities generated by condensation, scale growth and corrosion expansion of the impurities are ground into suspended matters dissolved in the fluid medium through high-speed rotation of a rotor of the shielding pump, the original condensation block trend is broken up, and finally, the excessive impurity precipitation in the shielding pump is prevented through pressure difference of an internal flow channel of the shielding pump, and the blocking of the shielding pump is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic diagram of an internal medium flow path of a canned motor pump according to an embodiment of the present application;
FIG. 2 is a flow chart of a method for reducing blocking of a canned pump according to an embodiment of the present application;
fig. 3 is a schematic diagram of a canned motor pump according to an embodiment of the present application.
The reference numbers in the drawings:
1-a shielding sleeve; 2-rotor; 3-an impeller; 4-axis; 5-bearing gap; 6-a flow path for a fluid medium; 7-a motor; 8-a detection element; 9-a timing element; 10-controller.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present application.
As shown in fig. 1, a canned motor pump according to an embodiment of the present application includes a motor 7 (as shown in fig. 3), an impeller 3, and a canned jacket 1, where a rotor 2 of the motor 7 and the impeller 3 of the canned motor pump are fixed on the same shaft 4, and the canned jacket 1 separates the rotor 2 and the stator of the motor 7, and the rotor 2 operates in a fluid medium to be transported. The fluid medium flow paths 6 are a bearing gap 5 between the shaft 4 and the bearing, a gap between the rotor 2 and the shield case 1, and an in-shaft flow path (shown by a broken line in fig. 1). The flow path 6 of the fluid medium also serves as a cooling circulation flow path for cooling the motor 7.
When the canned motor pump is in operation, the inlet of the impeller 3 is positioned at the low pressure side, the outer sides and the back sides of the blades are positioned at the high pressure side, a fluid medium is pressed into the canned motor sleeve 1 at the high pressure side, and the fluid medium is discharged from the shaft inner flow path through the low pressure side after lubricating and cooling the motor 7, so that one cooling and lubricating cycle is realized.
Before the fluid medium enters the shielding pump, the large-particle impurities are filtered through a primary filtering component with the size of 25 meshes/35 meshes, the shielding pump enters the fluid medium through a bearing gap 5, the cooling circulation flow passage can be used as a second filtering passage, and the impurity particles entering the shielding sleeve 1 are far smaller than the filtering effect of a filter with the size of more than 100 meshes. However, a small amount of slurry impurities cannot be filtered, after the inside of the shielding pump is accumulated, if the shielding pump is kept still for a long time for precipitation, the slurry impurities are easily coagulated into large-scale impurities, the flow channel is blocked, the starting moment is insufficient, and the shielding pump is blocked.
As shown in fig. 2, an embodiment of the present application provides a method for reducing blocking of a canned pump, including the following steps:
s1: detecting and judging whether the shielding pump is in a shutdown state, and if so, starting to record shutdown time t1; if not in the shutdown state, the detection ends.
S2: when T1 is more than or equal to T1, starting the canned motor pump, and starting to record the operation time T2 of the canned motor pump, wherein T1 is preset in the downtime.
S3: when T2 is more than or equal to T2, the canned motor pump is turned off, the timing is cleared, and the step S1 is returned, wherein T2 presets the running time.
After the shielding pump is stopped for a preset time, the shielding pump is started for a preset time, the temperature of the fluid medium is increased through self-heating of the shielding pump, impurities in the fluid medium are looser, the impurities are condensed, scale grows and erode and expand to generate internal impurities, the internal impurities are ground into suspended matters which are dissolved in the fluid medium through high-speed rotation of a rotor of the shielding pump, the original condensing and blocking trend is scattered, and finally, the excessive impurities are discharged through the pressure difference of an internal runner of the shielding pump, so that the blocking of the shielding pump is reduced.
In step S2, when the downtime does not reach the preset downtime, that is, T1 is less than T1, if the canned motor pump is turned on, for example, when the user turns on the machine set, the timer is cleared, and the method returns to step S1, and when the downtime is detected, the downtime is recorded again, and the method is continuously circulated.
In the method for reducing blocking of the canned motor pump provided by the embodiment of the application, the preset shutdown time may be t1=t11×n, where T11 is a preset shutdown period time and N is the number of preset shutdown periods.
Considering that rust generally occurs in iron in water with dissolved air for about 2 to 3 days, the present embodiment sets the value range of the preset downtime T1 to 2 to 3 days.
Moreover, under the condition that the machine set is stopped for 2-3 days, water in the pipeline system flows in the atmosphere due to the effect of thermal expansion and contraction (particularly, places with large day and night temperature difference or places with rapid weather convection), part of small particle impurities enter the shielding sleeve 1 together with the water, are accumulated together, and finally are condensed into massive large particle impurities.
Therefore, the method for reducing blocking of the shielding pump provided by the embodiment of the application is started and operated about 2-3 days after shutdown, at this time, the scale in the shielding sleeve 1 is just generated and is not diffused to the whole shielding sleeve 1, the friction resistance is small, and the blocking of the shielding pump can be avoided by grinding the shielding pump by self-rotation friction.
The method for reducing blocking of the shielding pump provided by the embodiment of the application presets the running time T2=T21+T22, wherein T21 is the time for the stable output of the shielding pump; t22 is the time for which the motor 7 of the canned pump is thermally stable. After the motor 7 is thermally stable, the temperature rise is basically above 50K, the temperature of the medium inside the shielding pump is higher than 70 ℃, and impurities such as rust and the like expand and are in a loose state and are more easily scattered by the rotor 2.
In the above embodiment, the stable output time T21 of the canned motor pump may be in the range of 3 minutes to 5 minutes.
In the above embodiment, the value of the thermal stabilization time T22 of the motor 7 of the canned motor pump may be in the range of 0.5 hours to 1 hour.
According to the method for reducing blocking of the shielding pump, provided by the embodiment of the application, through controlling the period interval of starting the shielding pump and each continuous operation time, the hidden danger of blocking caused by impurity condensation, scale growth and corrosion expansion of the shielding pump is eliminated to the greatest extent in a sprouting stage, the service life of the shielding pump is effectively prolonged, and the service life of the shielding pump can be prolonged under the same use condition.
As shown in fig. 3, the embodiment of the present application also provides a canned motor pump, which includes a motor 7, a detecting element 8, a timing element 9, and a controller 10; the controller 10 is electrically connected with the detection element 8, the timing element 9 and the motor 7;
the detecting element 8 is arranged on the motor 7 and is used for detecting whether the motor 7 is in a stop state or not, and sending a signal to the controller 10 when the motor 7 is in the stop state, wherein the controller 10 is used for controlling the timing element 9 to start recording the stop time t1;
the timing element 9 is used for sending a signal to the controller 10 when the shutdown time T1 of the motor 7 is more than or equal to T1, and the controller 10 is used for controlling the motor 7 to be started and simultaneously controlling the timing element 9 to start recording the operation time T2 of the motor 7;
the timing element 9 is used for sending a signal to the controller 10 when the starting-up running time T2 of the motor 7 is more than or equal to T2, and the controller 10 is used for controlling the motor 7 to be closed and simultaneously controlling the timing of the timing element 9 to be cleared;
wherein, T1 presets downtime, and T2 presets run time.
In the above-mentioned canned motor pump embodiment, when the detecting element 8 sends a stop signal to the controller 10 and the controller 10 does not receive the signal for reaching the preset stop time sent by the timing element 9, if the detecting element 8 detects that the motor 7 is turned on, a signal is sent to the controller 10, and the controller 10 controls the timing of the timing element 9 to be cleared.
In the above-described canned motor pump embodiment, the preset shutdown time t1=t11×n in the controller 10, where T11 is the time of one preset shutdown period and N is the number of preset shutdown periods.
In the above-described canned motor pump embodiment, the preset downtime T1 in the controller 10 ranges from 2 days to 3 days.
In the above-mentioned canned motor pump embodiment, the preset operation time t2=t21+t22 in the controller 10, where T21 is the time for the canned motor pump to output stably; t22 is the time for which the motor 7 of the canned pump is thermally stable.
In the above-described canned motor pump embodiment, the stable output time T21 of the canned motor pump in the controller 10 ranges from 3 minutes to 5 minutes.
In the above-described canned motor pump embodiment, the motor 7 thermal stabilization time T22 of the canned motor in the controller 10 ranges from 0.5 hours to 1 hour.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present application and are not limiting; while the application has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present application or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the application, it is intended to cover the scope of the application as claimed.
Claims (12)
1. A method for reducing lock-up of a canned pump, comprising the steps of:
s1: detecting whether the shielding pump is in a shutdown state, if so, starting to record shutdown time t1;
s2: when T1 is more than or equal to T1, starting the shielding pump, and starting to record the operation time T2 of the shielding pump;
s3: when T2 is more than or equal to T2, closing the shielding pump, resetting the timing, and returning to the step S1;
wherein, T1 presets the downtime, T2 presets the running time;
preset running time t2=t21+t22, where T21 is the stable output time of the canned motor pump; t22 is the thermal stability time of the motor (7) of the canned pump.
2. The method for reducing pump lock up of claim 1, wherein in step S2, if the pump is turned on when T1 < T1, the timer is cleared, and the process returns to step S1.
3. The method for reducing pump lock-up of claim 1, wherein the preset downtime t1=t11×n, wherein T11 is a time of one preset downtime period and N is a number of preset downtime periods.
4. The method for reducing sticking of a canned pump according to claim 1 wherein the preset downtime T1 is in the range of 2 days to 3 days.
5. The method for reducing sticking of a canned pump according to claim 1 wherein the stable output time T21 of the canned pump is in the range of 3 minutes to 5 minutes.
6. Method for reducing the seizing of a canned pump according to claim 1, characterized in that the motor (7) of the canned pump has a thermal stability time T22 ranging from 0.5 hours to 1 hour.
7. A canned motor pump, characterized by comprising a motor (7), a detection element (8), a timing element (9) and a controller (10); the controller (10) is electrically connected with the detection element (8), the timing element (9) and the motor (7);
the detection element (8) is arranged on the motor (7) and is used for detecting whether the motor (7) is in a stop state, when the motor (7) is in a non-stop state, the detection is finished, a stop signal is sent to the controller (10) when the motor (7) is in the stop state, and the controller (10) is used for controlling the timing element (9) to start recording the stop time t1;
the timing element (9) is used for sending a signal to the controller (10) when the stop time T1 of the motor (7) is more than or equal to T1, and the controller (10) is used for controlling the motor (7) to be started and simultaneously controlling the timing element (9) to start recording the running time T2 of the motor (7);
the timing element (9) is used for sending a signal to the controller (10) when the starting-up running time T2 of the motor (7) is more than or equal to T2, and the controller (10) is used for controlling the motor (7) to be closed and controlling the timing of the timing element (9) to be cleared;
wherein, T1 presets the downtime, T2 presets the running time;
a preset running time T2 = T21+ T22 in the controller (10), wherein T21 is the time at which the canned motor pump is stably outputting; t22 is the thermal stability time of the motor (7) of the canned pump.
8. The canned motor pump according to claim 7 wherein when the detecting element (8) sends a stop signal to the controller (10) and the controller (10) does not receive the signal sent by the timing element (9) to reach the preset stop time, if the detecting element (8) detects that the motor (7) is turned on, an on signal is sent to the controller (10), and the controller (10) controls the timing of the timing element (9) to be cleared.
9. A canned motor pump according to claim 7, characterized in that the preset downtime t1=t11×n in the controller (10), where T11 is the time of one preset downtime period and N is the number of preset downtime periods.
10. A canned pump according to claim 7 characterised in that the preset downtime T1 in the controller (10) is in the range of 2 to 3 days.
11. A canned motor pump according to claim 7 characterised in that the stable output time T21 of the canned motor pump in the controller (10) is in the range of 3 minutes to 5 minutes.
12. A canned motor pump according to claim 7 characterised in that the motor (7) of the canned motor pump in the controller (10) has a thermal stability time T22 in the range of 0.5 hours to 1 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710711712.8A CN107288916B (en) | 2017-08-18 | 2017-08-18 | Method for reducing blocking of canned motor pump and canned motor pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710711712.8A CN107288916B (en) | 2017-08-18 | 2017-08-18 | Method for reducing blocking of canned motor pump and canned motor pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107288916A CN107288916A (en) | 2017-10-24 |
| CN107288916B true CN107288916B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710711712.8A Active CN107288916B (en) | 2017-08-18 | 2017-08-18 | Method for reducing blocking of canned motor pump and canned motor pump |
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| Country | Link |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114713100B (en) * | 2022-02-28 | 2022-12-20 | 中国神华能源股份有限公司哈尔乌素露天煤矿 | Anti-precipitation control method, system and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR930013627A (en) * | 1991-12-12 | 1993-07-22 | 이헌조 | Hot water overheating and boiling noise prevention device of gas boiler |
| CN103470486A (en) * | 2013-10-09 | 2013-12-25 | 枣庄矿业(集团)有限责任公司田陈煤矿 | Intelligent submersible pump control box |
| CN103925702A (en) * | 2013-01-11 | 2014-07-16 | 广东美的暖通设备有限公司 | Heat pump water heater and control method thereof |
| CN105736343A (en) * | 2016-02-23 | 2016-07-06 | 沈云明 | Water pump control system and control method for preventing rusting and blocking and realizing small-flow work |
| CN207406516U (en) * | 2017-08-18 | 2018-05-25 | 珠海格力电器股份有限公司 | Canned motor pump |
-
2017
- 2017-08-18 CN CN201710711712.8A patent/CN107288916B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR930013627A (en) * | 1991-12-12 | 1993-07-22 | 이헌조 | Hot water overheating and boiling noise prevention device of gas boiler |
| CN103925702A (en) * | 2013-01-11 | 2014-07-16 | 广东美的暖通设备有限公司 | Heat pump water heater and control method thereof |
| CN103470486A (en) * | 2013-10-09 | 2013-12-25 | 枣庄矿业(集团)有限责任公司田陈煤矿 | Intelligent submersible pump control box |
| CN105736343A (en) * | 2016-02-23 | 2016-07-06 | 沈云明 | Water pump control system and control method for preventing rusting and blocking and realizing small-flow work |
| CN207406516U (en) * | 2017-08-18 | 2018-05-25 | 珠海格力电器股份有限公司 | Canned motor pump |
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| CN107288916A (en) | 2017-10-24 |
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