CN112814921B - Magnetic pump capable of preventing cavitation adjustment and adjusting method thereof - Google Patents
Magnetic pump capable of preventing cavitation adjustment and adjusting method thereof Download PDFInfo
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- CN112814921B CN112814921B CN202110148872.2A CN202110148872A CN112814921B CN 112814921 B CN112814921 B CN 112814921B CN 202110148872 A CN202110148872 A CN 202110148872A CN 112814921 B CN112814921 B CN 112814921B
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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
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
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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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0022—Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening
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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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/043—Shafts
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/406—Casings; Connections of working fluid especially adapted for liquid pumps
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a magnetic pump capable of preventing cavitation adjustment and an adjusting method thereof, wherein the magnetic pump comprises a front pump cover and a rear pump cover, an impeller is arranged in a pump cavity formed by the front pump cover and the rear pump cover, the front pump cover is provided with an inlet and an outlet, the pump shaft is rotatably arranged in the rear pump cover through a bearing, one end of the pump shaft is provided with the impeller, the other end of the pump shaft is provided with an inner magnetic rotor, an outer magnetic rotor is arranged opposite to the inner magnetic rotor, a separation sleeve is arranged between the outer magnetic rotor and the inner magnetic rotor, the separation sleeve is clamped at the end part of the rear pump cover through a clamping ring, a shaft ring is arranged on the pump shaft, a liquid storage cavity is formed between the shaft ring and the rear pump cover, a medium leading-in channel communicated with the pump cavity and the liquid storage cavity is arranged on the rear pump cover, a liquid guide groove communicated with the liquid storage cavity and the separation sleeve is arranged on the pump shaft, and a medium leading-out channel communicated with the separation sleeve is arranged on the rear pump cover. The magnetic pump and the adjusting method thereof can reduce the occurrence of cavitation or reduce the degree of cavitation erosion.
Description
Technical Field
The invention relates to the technical field of magnetic pumps, in particular to a magnetic pump capable of preventing cavitation adjustment and an adjusting method thereof.
Background
In the magnetic pump, the motor drives the outer magnetic rotor to rotate through the coupler, and the outer magnetic rotor and the inner magnetic rotor synchronously rotate through a magnetic field, so that the purpose of non-contact transmission is achieved. The pump shaft and the inner magnetic rotor are completely sealed by the pump body and the isolation sleeve, so the magnetic pump has the characteristics of safety, environmental protection, sealing and no leakage.
However, when the motor rotates to drive the outer magnetic rotor to rotate, the rotating magnetic field is cut by metal, eddy current heat is generated, and the temperature of the medium in the isolation sleeve is too high. The magnet can be demagnetized and transmission can not be carried out due to overhigh temperature. On the other hand, the higher the temperature, the more serious the cavitation and cavitation in the isolation sleeve, and even the structure of the isolation sleeve is damaged, which causes the leakage of the medium.
The common magnetic pump leads the medium of the isolation sleeve to circulate by introducing the high-pressure medium, thereby achieving the effects of cooling and increasing the pressure and reducing the generation of cavitation and cavitation. However, the ordinary magnetic pump does not have the self-adjusting capability, and once the magnetic pump is in a deviated working condition, or a cooling circuit of the magnetic pump is blocked and has other complex conditions, so that the internal flow of the magnetic pump is reduced, which all can cause the occurrence of the cavitation phenomenon.
The invention provides a cavitation detection and adjustment device and system of a magnetic pump, and aims to provide a cavitation detection and adjustment device and system of a magnetic pump, which are characterized in that: on one hand, a new structural mode is provided on the basis of the original magnetic pump structure, and the internal cavitation of the magnetic pump can be detected and adjusted; on the other hand, once the cavitation phenomenon occurs inside the magnetic pump, a corresponding detection and adjustment control scheme is provided, so that the performance of the magnetic pump is improved, and the service life of the equipment is prolonged.
Disclosure of Invention
The invention aims to solve the technical problem of providing a magnetic pump capable of preventing cavitation regulation and a regulation method thereof, and reducing cavitation or reducing cavitation corrosion degree.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a magnetic drive pump that can anti-cavitation regulation, including preceding pump cover and back pump cover, the impeller sets up in the pump chamber that preceding pump cover and back pump cover are constituteed, preceding pump cover is equipped with entry and export, the pump shaft passes through the bearing and rotates the installation in back pump cover, the one end of pump shaft is equipped with the impeller, the other end is equipped with interior magnetic rotor, outer magnetic rotor sets up relative interior magnetic rotor, be equipped with the separation sleeve between outer magnetic rotor and the interior magnetic rotor, the separation sleeve is through clamping ring card dress at back pump cover tip, be equipped with the shaft collar on the pump shaft, constitute between shaft collar and the back pump cover and hold the liquid chamber, be equipped with the medium induction channel with pump chamber and hold the liquid chamber intercommunication on the back pump cover, be equipped with on the pump shaft and hold the liquid groove that liquid chamber and separation sleeve communicate, be equipped with the medium derivation channel of separation sleeve intercommunication on the back pump cover.
In a preferred scheme, a pressure plate is arranged between the clamping ring and the isolating sleeve.
In a preferable scheme, a first medium channel communicated with the liquid storage cavity is arranged on the rear pump cover, and the first medium channel is communicated with an outlet of the front pump cover through a guide pipe.
In a preferred scheme, the draft tube is provided with an electromagnetic valve.
In a preferable scheme, a second medium channel communicated with the liquid storage cavity is arranged on the rear pump cover, the second medium channel is connected with a delivery pump through a pipeline, and the delivery pump is communicated with a medium storage device through a pipeline.
In a preferable scheme, a one-way valve is arranged at an outlet of the medium guide-out channel.
In a preferable scheme, a pressure sensor is arranged on the inlet and/or the medium leading-in channel, the pressure sensor is electrically connected with the data processing module and the central control module in sequence, and the central control module controls the opening and closing of the electromagnetic valve or the delivery pump.
In a preferred scheme, a temperature sensor is arranged in the isolation sleeve, and the temperature sensor is electrically connected with the data processing module and the central control module in sequence.
The invention also provides an adjusting method of the magnetic pump capable of preventing cavitation adjustment, which comprises the following steps:
after the temperature sensor detects that the temperature in the isolation sleeve is higher than a set value, the central control module controls the motor to accelerate and accelerates the flow of a medium in the medium leading-out channel;
after the temperature sensor detects that the temperature in the isolation sleeve cannot be reduced or the pressure of the pressure sensor is higher than a set value, the central control module controls the electromagnetic valve to be opened, and the guide pipe and the first medium channel conduct medium introduction to the liquid storage cavity;
and step two, when the temperature sensor detects that the temperature in the isolation sleeve still cannot be reduced, the central control module controls the delivery pump to supply the medium.
The invention provides a magnetic pump capable of preventing cavitation regulation and a regulation method thereof, and the magnetic pump has the following beneficial effects:
1. a medium leading-in channel and a medium leading-out channel are formed in a rear pump cover of the magnetic pump, and a medium with higher pressure at the edge of the impeller can be led in, so that the pressure of the isolation sleeve is improved, and the cavitation phenomenon is reduced.
2. The magnetic pump is internally provided with a plurality of pressure sensors and temperature sensors, measures parameters such as temperature and pressure, combines a system for cavitation detection and regulation of the magnetic pump, preprocesses information collected by the sensors, removes abnormal data, combines the data, transmits the data to the central control module, judges the cavitation degree and position of the central control module, obtains a judgment result, sends the judgment result to the execution structure, and executes the structure to regulate parameters such as flow, temperature and pressure in the pump, reduce the degree of cavitation, improve the performance of the magnetic pump and prolong the service life of equipment.
3. And a delivery pump is arranged, when the sensor is abnormal, the central control module transmits the adjusting method to a corresponding actuating mechanism, and finally the electromagnetic pump is recovered to the normal condition by adjusting the rotating speed of the motor, the opening and closing of the electromagnetic valve of the flow guide pipe and the opening and closing of the delivery pump.
Drawings
The invention is further illustrated with reference to the accompanying drawings and examples:
FIG. 1 is a schematic view of the structure of embodiment 1;
FIG. 2 is a schematic structural view of example 2;
FIG. 3 is a schematic structural view of embodiment 3;
fig. 4 is a control block diagram of the present invention.
In the figure: the pump comprises a front pump cover 1, a rear pump cover 2, a pump shaft 3, an inner magnetic rotor 4, an outer magnetic rotor 5, a spacer sleeve 6, a clamping ring 7, a liquid storage cavity 8, a medium leading-in channel 9, a medium leading-out channel 10, a pressing plate 11, a first medium channel 12, a guide pipe 13, an electromagnetic valve 14, a second medium channel 15, a delivery pump 16, a check valve 17, a pressure sensor 18, a data processing module 19, a central control module 20, a temperature sensor 21, an impeller 22, an inlet 101, an outlet 102, a shaft collar 301 and a liquid guide groove 302.
Detailed Description
As shown in fig. 1, a magnetic pump capable of preventing cavitation adjustment includes a front pump cover 1 and a rear pump cover 2, an impeller 22 is disposed in a pump cavity formed by the front pump cover 1 and the rear pump cover 2, the front pump cover 1 is provided with an inlet 101 and an outlet 102, a pump shaft 3 is rotatably mounted in the rear pump cover 2 through a bearing, one end of the pump shaft 3 is provided with the impeller 22, the other end of the pump shaft is provided with an inner magnetic rotor 4, an outer magnetic rotor 5 is disposed opposite to the inner magnetic rotor 4, a spacer sleeve 6 is disposed between the outer magnetic rotor 5 and the inner magnetic rotor 4, the spacer sleeve 6 is clamped at the end portion of the rear pump cover 2 through a clamping ring 7, a shaft collar 301 is disposed on the pump shaft 3, a liquid storage cavity 8 is formed between the shaft collar 301 and the rear pump cover 2, a medium introducing channel 9 communicated with the pump cavity and the liquid storage cavity 8 is disposed on the rear pump cover 2, a liquid guiding channel 302 communicated with the liquid storage cavity 8 and the spacer sleeve 6 is disposed on the pump shaft 3, and a medium leading-out channel 10 communicated with the spacer sleeve 6 is disposed on the rear pump cover 2.
Preferably, a pressure plate 11 is arranged between the clamping ring 7 and the isolation sleeve 6.
By providing the pressing plate 11, the mounting sealability of the spacer 6 is improved.
The inlet 101 and the medium introducing channel 9 are provided with pressure sensors 18, the pressure sensors 18 are electrically connected with a data processing module 19 and a central control module 20 in sequence, and the central control module 20 controls the rotating speed of a motor connected with the outer magnetic rotor 5.
A temperature sensor 21 is arranged in the isolation sleeve 6, and the temperature sensor 21 is electrically connected with the data processing module 19 and the central control module 20 in sequence.
As shown in fig. 4, data acquired from multiple sensors can be combined through data integration by the data processing module 19, and reasonable data integration is helpful for reducing data redundancy, so that subsequent central control module decisions are more accurate and faster. For example, when the data obeys normal distribution, the abnormal data can be processed by 3 σ rule; for outliers in the data, a direct deletion method is adopted; the missing outliers in the data are usually supplemented with a mean or median.
Or by analyzing the correlation coefficient among the parameters, if the parameters have strong correlation, one parameter can be removed according to the actual requirement during data processing; the dimension of the data can be reduced by a principal component analysis method, and particularly when more parameters are needed, the change of the main parameters is researched.
The central control module 20 mainly judges the preprocessed parameters and obtains the cavitation degree of the magnetic pump through classification. And meanwhile, judging the position of cavitation according to the parameters transmitted by the sensors at different positions. The adjustment profile is communicated to the actuator based on the degree of cavitation occurring at the various locations.
The central control module can establish a model of the cavitation occurrence degree according to the measured parameter data by using methods such as SVM and the like. First, the model is trained through historical data or experimentally derived data so that the model has optimal parameters. The trained model can identify and classify the input signals to obtain different cavitation degrees. The central control module transmits different adjustment schemes to the actuators according to the results.
When the magnetic pump works, a medium in a pump cavity formed by the front pump cover 1 and the rear pump cover 2 enters the liquid storage cavity 8 through the medium guide-in channel 9, then is guided by the liquid guide groove 302 and enters the isolation sleeve 6 for cooling, and the medium in the isolation sleeve 6 is guided out through the medium guide-out channel 10, so that the medium circularly flows, and the cavitation of the magnetic pump is prevented.
Preferably, the outlet of the medium outlet channel 10 is provided with a one-way valve 17. The back flow of the medium outlet passage 10 can be prevented by providing the check valve 17.
When the flow rate and the pressure at the inlet 101 are abnormal. For example, if the flow rate is smaller than the normal value, the central control module 20 will control the motor to rotate faster until the flow rate returns to normal.
After the temperature sensor 21 detects that the temperature in the isolation sleeve 6 is higher than the set value, the central control module 20 controls the motor to accelerate, and accelerates the flow of the medium in the medium leading-out channel 10.
Example 2: as shown in fig. 2, a first medium channel 12 communicated with the liquid storage chamber 8 is provided on the rear pump cover 2, and the first medium channel 12 is communicated with an outlet 102 of the front pump cover 1 through a flow guide tube 13.
Preferably, the draft tube 13 is provided with an electromagnetic valve 14.
The medium leading-in channel 9 is provided with a pressure sensor 18, the pressure sensor 18 is electrically connected with a data processing module 19 and a central control module 20 in sequence, and the central control module 20 controls the opening and closing of the electromagnetic valve 14.
A temperature sensor 21 is arranged in the isolation sleeve 6, and the temperature sensor 21 is electrically connected with the data processing module 19 and the central control module 20 in sequence.
When the pressure sensor 18 on the medium introducing channel 9 detects that the pressure is abnormal, which indicates that the medium introducing channel 9 is blocked, the data processing module 19 controls the electromagnetic valve 14 to open, and the medium is conveyed through the first medium channel 12 and the flow guide pipe 13, so that the medium enters the liquid storage cavity 8, then is guided through the liquid guide groove 302, and enters the isolation sleeve 6 for cooling.
After the temperature sensor 21 detects that the temperature in the isolation sleeve 6 cannot be reduced or the pressure of the pressure sensor 18 is higher than a set value after the temperature reduction method in the embodiment is adopted, the central control module 20 controls the electromagnetic valve 14 to be opened, and the diversion pipe 13 and the first medium channel 12 conduct medium into the liquid storage cavity 8.
Example 3: as shown in fig. 3, the rear pump cover 2 is provided with a second medium passage 15 communicated with the liquid storage chamber 8, the second medium passage 15 is connected with a delivery pump 16 through a pipeline, and the delivery pump 16 is communicated with a medium storage device through a pipeline.
The inlet 101 and/or the medium introducing channel 9 are/is provided with a pressure sensor 18, the pressure sensor 18 is electrically connected with a data processing module 19 and a central control module 20 in sequence, and the central control module 20 controls the opening and closing of the electromagnetic valve 14 or the delivery pump 16.
A temperature sensor 21 is arranged in the isolation sleeve 6, and the temperature sensor 21 is electrically connected with the data processing module 19 and the central control module 20 in sequence.
The central control module 20 will first take the measures of embodiments 1 and 2, and if the temperature drop is not obvious after a period of time, the central control module will turn on the central control module, and will first take the measures of the first 2 cases, and if the temperature drop is not obvious after a period of time, the central control module will turn on the delivery pump 16, so as to accelerate the internal circulation of the pump, lower the temperature, and reduce the occurrence of cavitation.
The rear pump cover 2 of the magnetic pump is provided with a medium leading-in channel 9 and a medium leading-out channel 10, and a medium with higher pressure at the edge of the impeller 22 can be led in, so that the pressure of the isolation sleeve 6 is improved, and the occurrence of cavitation is reduced.
Compared with the common magnetic pump, the invention can greatly reduce the phenomena of cavitation and cavitation, improve the performance of the magnetic pump and prolong the service life of the magnetic pump, especially under the partial working condition and the poor running state, and has practical value.
Claims (3)
1. The adjusting method of the magnetic pump capable of preventing cavitation adjustment is characterized in that the magnetic pump capable of preventing cavitation adjustment is adjusted and comprises a front pump cover (1) and a rear pump cover (2), an impeller (22) is arranged in a pump cavity formed by the front pump cover (1) and the rear pump cover (2), the front pump cover (1) is provided with an inlet (101) and an outlet (102), a pump shaft (3) is rotatably installed in the rear pump cover (2) through a bearing, one end of the pump shaft (3) is provided with the impeller (22), the other end of the pump shaft is provided with an inner magnetic rotor (4), the outer magnetic rotor (5) is arranged opposite to the inner magnetic rotor (4), an isolating sleeve (6) is arranged between the outer magnetic rotor (5) and the inner magnetic rotor (4), the isolating sleeve (6) is clamped at the end part of the rear pump cover (2) through a clamping ring (7), the pump shaft ring (301) is arranged on the pump shaft (3), a shaft ring (301) is formed between the shaft ring (301) and the rear pump cover (2), a medium storage cavity (8) is arranged on the rear pump cover (2), a medium guide sleeve (9) communicated with the pump cavity (8) and a liquid guide channel (8) arranged on the pump shaft (3), and a liquid guide sleeve (8) communicated with the isolating liquid guide channel (8) and a liquid guide channel (8) is arranged on the pump cover (2); a first medium channel (12) communicated with the liquid storage cavity (8) is arranged on the rear pump cover (2), the first medium channel (12) is communicated with an outlet (102) of the front pump cover (1) through a guide pipe (13), and an electromagnetic valve (14) is arranged on the guide pipe (13); a second medium channel (15) communicated with the liquid storage cavity (8) is arranged on the rear pump cover (2), the second medium channel (15) is connected with a delivery pump (16) through a pipeline, and the delivery pump (16) is communicated with a medium storage device through a pipeline; the inlet (101) and/or the medium leading-in channel (9) are/is provided with a pressure sensor (18), the pressure sensor (18) is electrically connected with a data processing module (19) and a central control module (20) in sequence, and the central control module (20) controls the opening and closing of the electromagnetic valve (14) or the delivery pump (16); a temperature sensor (21) is arranged in the isolation sleeve (6), and the temperature sensor (21) is electrically connected with the data processing module (19) and the central control module (20) in sequence;
the method comprises the following steps:
step one, after a temperature sensor (21) detects that the temperature in an isolation sleeve (6) is higher than a set value, a central control module (20) controls a motor to accelerate, and the flow of a medium in a medium leading-out channel (10) is accelerated;
step two, after the temperature sensor (21) detects that the temperature in the isolation sleeve (6) cannot be reduced or the pressure of the pressure sensor (18) is higher than a set value, the central control module (20) controls the electromagnetic valve (14) to be opened, and the liquid guide pipe (13) and the first medium channel (12) conduct medium introduction to the liquid storage cavity (8);
and step three, when the temperature sensor (21) detects that the temperature in the isolation sleeve (6) still cannot be reduced, the central control module (20) controls the delivery pump (16) to supply the medium.
2. Method for adjusting a magnetic pump capable of cavitation prevention adjustment according to claim 1, characterized in that a pressure plate (11) is provided between the snap ring (7) and the spacer sleeve (6).
3. Method for adjusting a magnetic pump capable of anti-cavitation adjustment according to claim 1, characterized in that the outlet of the medium outlet channel (10) is provided with a one-way valve (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110148872.2A CN112814921B (en) | 2021-02-03 | 2021-02-03 | Magnetic pump capable of preventing cavitation adjustment and adjusting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110148872.2A CN112814921B (en) | 2021-02-03 | 2021-02-03 | Magnetic pump capable of preventing cavitation adjustment and adjusting method thereof |
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| Publication Number | Publication Date |
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| CN112814921A CN112814921A (en) | 2021-05-18 |
| CN112814921B true CN112814921B (en) | 2022-10-21 |
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| CN202110148872.2A Active CN112814921B (en) | 2021-02-03 | 2021-02-03 | Magnetic pump capable of preventing cavitation adjustment and adjusting method thereof |
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Families Citing this family (1)
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| CN114263637B (en) * | 2021-12-30 | 2024-01-02 | 浙江启尔机电技术有限公司 | Magnetic coupling temperature control system and magnetic pump adopting same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103573682A (en) * | 2012-07-31 | 2014-02-12 | 上海佰诺泵阀有限公司 | Magnetic drive pump with bearing block |
| CN103615416A (en) * | 2013-11-25 | 2014-03-05 | 丹东克隆先锋泵业有限公司 | Magnetic pump capable of preventing particulate matter from entering inner rotor cavity |
| CN104806530B (en) * | 2015-04-24 | 2017-01-18 | 丹东通博泵业有限公司 | High pressure resistant magnetic pump |
| CN204984938U (en) * | 2015-05-15 | 2016-01-20 | 李忠山 | Novel brushless DC motor of nai methyl alcohol fuel pump |
| CN105298863B (en) * | 2015-11-20 | 2017-07-07 | 温州市安得利耐酸泵有限公司 | A kind of magnetic drive pump of resistance to dry grinding |
| CN106677883B (en) * | 2016-12-14 | 2019-11-15 | 山推工程机械股份有限公司 | A kind of control method of cooling system |
| CN211009132U (en) * | 2019-09-02 | 2020-07-14 | 丹东通博泵业有限公司 | Magnetic pump with external circulation structure for conveying easily gasified medium |
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