CN114263637B - Magnetic coupling temperature control system and magnetic pump adopting same - Google Patents
Magnetic coupling temperature control system and magnetic pump adopting same Download PDFInfo
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- CN114263637B CN114263637B CN202111640223.0A CN202111640223A CN114263637B CN 114263637 B CN114263637 B CN 114263637B CN 202111640223 A CN202111640223 A CN 202111640223A CN 114263637 B CN114263637 B CN 114263637B
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- 239000002184 metal Substances 0.000 claims abstract description 105
- 229910052751 metal Inorganic materials 0.000 claims abstract description 105
- 238000001816 cooling Methods 0.000 claims abstract description 102
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 48
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- 230000008569 process Effects 0.000 description 7
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- 238000013021 overheating Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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Abstract
The invention discloses a magnetic coupling temperature control system and a magnetic pump adopting the same, wherein the magnetic coupling temperature control system comprises a magnetic coupling and a temperature control system; the magnetic coupling comprises an outer rotor, an inner rotor and a metal spacer; the temperature control system comprises a first temperature sensor, a second temperature sensor, a control module and a cooling module, wherein the first temperature sensor and the second temperature sensor are respectively connected with the control module, the control module is connected with the cooling module, magnetic steel in the inner rotor and the outer rotor is magnetically coupled, and a metal spacer is arranged between the inner rotor and the outer rotor; the method comprises the steps that a first temperature sensor and a second temperature sensor are arranged on the axially outer side of a region swept by a projection surface of magnetic steel on a metal spacer from the near to the far, and a control module controls the on-off of a cooling module according to detected temperature obtained through detection and corresponding preset distance so as to cool the metal spacer. The invention has high temperature detection precision and realizes the adaptation of the cooling capacity of the temperature control system and the heating power of the electric vortex.
Description
Technical Field
The invention belongs to the technical field of magnetic couplings, and particularly relates to a magnetic coupling temperature control system and a magnetic pump adopting the magnetic coupling temperature control system.
Background
The magnetic coupling is a non-contact coupling and consists of an outer rotor, an inner rotor and a spacer bush, wherein the outer rotor is connected with a power piece, and the inner rotor is connected with a driven piece; a spacer bush is arranged between the outer rotor and the inner rotor, and separates the inner rotor from the outer rotor; a plurality of magnetic steels are arranged in the outer rotor and the inner rotor, the plurality of magnetic steels are distributed in an annular mode, gaps are reserved between adjacent magnetic steels, and each magnetic steel is adhered in the inner rotor and the outer rotor through glue; the non-contact power transmission between the power piece and the driven piece is realized through the magnetic connection between the magnetic steels.
The spacer bush in the magnetic coupling can be made of plastic materials such as resin, but the pressure resistance of the resin spacer bush is poor; in order to enhance the pressure resistance of the spacer, the spacer can be made of a metal material, and in the operation process of the magnetic coupling, eddy currents can be generated in the metal spacer, and the eddy currents generate heat to possibly weaken the magnetism of the magnetic steel, so that the magnetic steel has a demagnetization problem.
In the existing cooling mode of the metal spacer, air cooling or liquid cooling is generally adopted on one side or two sides of the metal spacer to reduce the temperature of the metal spacer; however, under the working condition that the magnetic coupling is high in load, the inner rotor and the outer rotor are required to operate at a high rotating speed state, and at the moment, a great amount of heat can be rapidly generated by the eddy current in the metal spacer, so that the air cooling or liquid cooling system is required to keep high cooling capacity to control the metal spacer to be in a normal temperature range in order to avoid high temperature of the metal spacer; however, in the cooling process, if the air cooling or liquid cooling system always maintains higher cooling capacity, the energy consumption is greatly increased; if the air cooling or liquid cooling system is always in normal average energy consumption, under the working condition that the magnetic coupling is in a load surge condition, because the inner rotor and the outer rotor are operated in a high-rotation speed state, a large amount of heat can be quickly generated by the eddy current in the metal spacer, the air cooling or liquid cooling system is difficult to control the metal spacer in a normal temperature range, a large amount of heat quickly generated by the eddy current can generate local high temperature in the magnetic coupling, and when the temperature value of the local high temperature is higher than the demagnetizing critical temperature of the magnetic steel, the magnetic steel in the local high temperature can have the problem of weakening or demagnetizing of magnetism, so that the coupling capability between the outer rotor and the inner rotor of the magnetic coupling is reduced, and the power transmission is unstable or is interrupted.
However, in the magnetic coupling, because the eddy current heating area is the area swept by the projection surface of the magnetic steel on the metal spacer, the magnetic field intensity of the space where the area is located is large, the temperature sensor is easy to be interfered by the magnetic field, the temperature measurement error is large, and the metal spacer is arranged between the inner rotor and the outer rotor, and the space between the metal spacer and the inner rotor and the space between the metal spacer and the outer rotor are smaller, the temperature of the eddy current heating area in the metal spacer is difficult to effectively measure, so that the cooling capacity of an air cooling or liquid cooling system is difficult to be accurately matched with the heating power of the eddy current, and the problems that the eddy current heat is difficult to be discharged in time or the cooling energy consumption is too high can occur.
During long-term operation of the magnetic coupling, the influence of heat generated by the eddy current on the magnetism of the magnetic steel can be accumulated along with time.
The magnetic coupling can be applied to a transmission mechanism in the magnetic pump, so that linkage between a motor shaft and a pump shaft is realized, and power transmission from a pump driving motor to a pump is realized; in the prior art, an effective method for detecting the temperature of an eddy current heating area in a magnetic coupling is lacked, and the cooling system cannot be effectively regulated, so that the cooling capacity of the cooling system is difficult to accurately adapt to the heating power of the eddy current; if the load of the magnetic coupling increases rapidly, so that the cooling system is difficult to effectively cool the magnetic coupling, local high temperature is generated in the magnetic coupling, the magnetic steel in the local high temperature may have the problem of weakening or demagnetizing, the magnetic coupling or a device using the magnetic coupling may malfunction or even stop, and safety accidents may be caused in application occasions such as dangerous chemical conveying systems.
At present, some schemes for cooling a magnetic pump exist, for example, chinese patent application publication No. CN112983832A discloses a high-pressure magnetic pump with self-cooling, which comprises a pump body, a pump cover arranged on the right side of the pump body, an air cooling assembly and an isolation assembly, wherein a connecting shell is arranged on the right side of the pump cover, a motor is arranged on the right side of the connecting shell, the motor, the connecting shell and the pump body are all arranged on a bottom plate through a bracket, a water guide pipe is fixedly communicated with a water inlet on the left side of the pump body, a temperature detector is arranged at the top of the water guide pipe, and the air cooling assembly arranged on the inner side of the pump cover and the water cooling assembly arranged in the isolation assembly are used for selecting different cooling modes according to different medium temperatures. The invention can correspondingly cool the magnetic pump, but mainly researches on the cooling mode, does not develop research on the accuracy of temperature detection, and only measures the temperature through the temperature detector arranged at the top of the water guide pipe.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a magnetic coupling temperature control system and a magnetic pump using the same, which can effectively detect the temperature extreme value in a metal spacer and timely cool the metal spacer, effectively avoid the problem of local high temperature in the magnetic coupling, realize the cooling capacity of a cooling system and the heating power phase adaptation of an eddy current, and avoid the problem of overheating demagnetization of magnetic steel.
The invention is realized by the following technical scheme:
a temperature control system of a magnetic coupling comprises the magnetic coupling and a temperature control system;
the magnetic coupling comprises an outer rotor, an inner rotor and a metal spacer;
the temperature control system comprises a first temperature sensor, a second temperature sensor, a control module and a cooling module, wherein the first temperature sensor and the second temperature sensor are respectively connected with the control module, and the control module is connected with the cooling module;
the outer rotor and the inner rotor are respectively provided with magnetic steel, the magnetic steel in the outer rotor is magnetically coupled with the magnetic steel in the inner rotor, and the metal spacer is arranged between the outer rotor and the inner rotor;
a first temperature sensor and a second temperature sensor are arranged on the axially outer side of a region swept by a projection surface of the magnetic steel on the metal spacer from the near to the far, the second temperature sensor is axially spaced from the first temperature sensor by a first preset distance, and the first temperature sensor is axially spaced from a preset point in the region swept by the projection surface of the magnetic steel on the metal spacer by a second preset distance;
the control module is used for controlling the opening and closing of the cooling module according to the first preset distance and the second preset distance and the detection temperature obtained by the detection of the first temperature sensor and the second temperature sensor so as to cool the metal spacer bush.
Therefore, the invention aims at the problems that the temperature detection of the eddy current heating area in the magnetic coupling is difficult, the cooling capacity of the cooling system is difficult to adapt to the heating power of the eddy current, the magnetic steel is overheated and demagnetized, and the like, and the first temperature sensor and the second temperature sensor are arranged from the near to the far outside in the axial direction of the area swept by the projection surface of the magnetic steel on the metal spacer, and the temperature measured by the temperature sensors and the corresponding preset distance are utilized to judge whether to start the cooling system to cool in time, so that the local high temperature problem in the magnetic coupling is effectively avoided, the cooling capacity of the cooling system is adaptive to the heating power of the eddy current, and the overheating and demagnetizing problem of the magnetic steel is avoided.
Preferably, the preset point is specifically the central position of the eddy current heating area, namely the temperature extreme point of the side wall of the metal spacer.
Preferably, the control module comprises a pre-storing unit, a calculating unit and a control unit which are sequentially connected, the first temperature sensor and the second temperature sensor are respectively connected with the calculating unit, and the control unit is connected with the cooling module;
the pre-storing unit is used for storing a first preset distance, a second preset distance and a preset temperature control value;
the calculating unit is used for calculating the extreme value temperature Ta of the temperature extreme point according to the first preset distance and the second preset distance and the detected temperatures obtained by the first temperature sensor and the second temperature sensor;
and the control unit is used for controlling the opening and closing of the cooling module according to the extreme temperature and a preset temperature control value so as to cool the metal spacer bush.
Preferably, the calculation formula of the extremum temperature Ta is:
，
wherein T1 represents a detected temperature detected by the first temperature sensor, T2 represents a detected temperature detected by the second temperature sensor, L1 represents a first preset distance, and L2 represents a second preset distance.
Preferably, the preset temperature control value comprises a first temperature control value T3 and a second temperature control value T4, and T3 is more than T4;
the control logic of the control unit specifically comprises:
when the cooling module is closed, if Ta is more than or equal to T3, the cooling module is started, and if Ta is less than T3, the cooling module is not started;
when the cooling module is started, if Ta is more than or equal to T4, the cooling module is kept in an on state, and if Ta is less than T4, the cooling module is closed.
According to the specific judgment logic for controlling the on-off of the cooling module, the cooling module can be prevented from being in an on-off frequent switching state due to temperature fluctuation.
The magnetic pump further comprises the magnetic coupling temperature control system, a shell assembly and a pump driving motor;
the shell assembly comprises a front pump shell and a rear pump shell, the metal spacer bush is fixedly arranged between the front pump shell and the rear pump shell so as to divide an internal cavity between the front pump shell and the rear pump shell into two mutually-separated pump cavities and a driving cavity, the inner rotor is arranged in the pump cavities, and the outer rotor is arranged in the driving cavity;
the pump driving motor is connected with the outer rotor to drive the outer rotor to rotate;
the first temperature sensor and the second temperature sensor are both arranged in the driving cavity, the through inlet and the discharge outlet are both arranged on the side wall of the driving cavity, and the cooling module is respectively communicated with the through inlet and the discharge outlet;
the pump cavity is internally provided with an impeller connected with the inner rotor, and the front pump shell is provided with a suction inlet and a discharge outlet which are communicated with the pump cavity.
Therefore, in the magnetic pump disclosed by the invention, the fluid pumped in the pump cavity can flow in the whole pump cavity, the inner side of the metal spacer can be in contact with the fluid pumped in the pump cavity to take away part of heat generated by the electric vortex, but the fluid in the pump cavity has poor fluidity, and when the inner rotor and the outer rotor rapidly rotate and the electric vortex rapidly generate heat, the fluid sucked in the pump is difficult to cool the metal spacer in time, and the metal spacer still has a high-temperature problem. The low-temperature fluid medium in the cooling module is introduced into the driving cavity between the rear pump shell and the metal spacer through the inlet to form a medium atmosphere which surrounds the magnetic coupling, the temperature of the metal spacer is reduced in a heat exchange mode, and the fluid medium after heat exchange is discharged out of the space where the magnetic coupling is located through the discharge port and flows back into the cooling module.
Preferably, a pump cover and a pump shaft are arranged in the pump cavity;
the pump cover is fixedly arranged at the joint position of the metal spacer bush and the front pump shell, and a hole is arranged in the pump cover;
the pump shaft penetrates through the pump cover, the connecting part of the pump shaft and the pump cover is connected through a bearing, one end of the pump shaft is fixedly connected with the impeller, the other end of the pump shaft is connected with the metal spacer through a bearing, and the inner rotor is fixedly arranged on the pump shaft between the metal spacer and the pump cover.
Preferably, the motor shaft end of the pump driving motor penetrates through the side wall of the rear pump shell and extends into the driving cavity to be connected with the outer rotor so as to drive the outer rotor to rotate.
Preferably, a base is fixedly arranged at the bottom of the rear pump shell and is used for supporting the whole magnetic pump.
Preferably, the longitudinal height of the position of the through hole is higher than the longitudinal height of the top of the outer rotor installed in the magnetic pump, and the longitudinal height of the position of the discharge hole is lower than the longitudinal height of the bottom of the outer rotor installed in the magnetic pump.
The beneficial effects of the invention are as follows:
aiming at the problems that the temperature detection of an eddy current heating area in a magnetic coupling is difficult, the cooling capacity of a temperature control system is difficult to adapt to the heating power of an eddy current, the overheating and demagnetizing of magnetic steel are difficult, and the like, a first temperature sensor and a second temperature sensor are arranged from the near to the far on the axial outer side of a region swept by a projection surface of the magnetic steel on a metal spacer, the temperature measured by a plurality of temperature sensors and the corresponding preset distance are utilized, the extreme temperature of the metal spacer is calculated, whether a cooling module is started or not is judged according to the extreme temperature of the metal spacer to timely cool, the problem of local high temperature in the magnetic coupling is effectively avoided, the cooling capacity of the temperature control system is adapted to the heating power of the eddy current, and the overheating and demagnetizing problems of the magnetic steel are avoided.
According to the specific judgment logic for controlling the on-off of the cooling module, the cooling module can be prevented from being in an on-off frequent switching state due to temperature fluctuation.
The fluid sucked by the impeller pump cools the metal spacer, and the temperature control system cools the metal spacer, so that the cooling effect on the metal spacer is excellent.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the internal structure of a magnetic pump employing a magnetic coupling temperature control system according to the present invention;
FIG. 2 is a schematic flow diagram of a cryogenic fluid medium within a chamber;
FIG. 3 is an enlarged view of a portion of FIG. 1;
FIG. 4 is a schematic diagram of a temperature control system according to the present invention;
FIG. 5 is a schematic diagram of the principle of temperature regulation;
FIG. 6 is a logic diagram of the on-off control of the cooling module;
in the figure: 1. front pump shell, 2, pump cavity, 3, suction inlet, 4, discharge outlet, 5, rear pump shell, 6, outer rotor, 7, metal spacer, 8, inner rotor, 9, pump cover, 10, driving cavity, 11, magnetic steel, 13, first temperature sensor, 14, second temperature sensor, 21, impeller, 22, pump shaft, 25, motor shaft end, 26, inlet, 27, discharge outlet, 30, pump driving motor, 40, base, 100, temperature control system, 101, control module, 102, cooling module, 1011, pre-storing unit, 1012, calculating unit, 1013, control unit, a, temperature extreme point.
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples.
Embodiment one:
referring to fig. 1 and 3, the present embodiment provides a magnetic coupling temperature control system, which includes a magnetic coupling and a temperature control system 100;
the magnetic coupling comprises an outer rotor 6, an inner rotor 8 and a metal spacer 7;
the temperature control system 100 comprises a first temperature sensor 13, a second temperature sensor 14, a control module 101 and a cooling module 102, wherein the first temperature sensor 13 and the second temperature sensor 14 are respectively connected with the control module 101, and the control module 101 is connected with the cooling module 102;
the outer rotor 6 and the inner rotor 8 are respectively provided with magnetic steel 11, the magnetic steel 11 in the outer rotor 6 is magnetically coupled with the magnetic steel 11 in the inner rotor 8, and the metal spacer 7 is arranged between the outer rotor 6 and the inner rotor 8;
a first temperature sensor 13 and a second temperature sensor 14 are arranged on the axially outer side of the area swept by the projection surface of the magnetic steel 11 on the metal spacer 7 from the near to the far, the second temperature sensor 14 is axially spaced from the first temperature sensor 13 by a first preset distance, and the first temperature sensor 13 is axially spaced from a preset point in the area swept by the projection surface of the magnetic steel 11 on the metal spacer 7 by a second preset distance;
the control module 101 controls the on-off of the cooling module 102 according to the first preset distance and the second preset distance and the detected temperatures detected by the first temperature sensor 13 and the second temperature sensor 14 so as to cool down the metal spacer 7.
Therefore, the invention aims at the problems that the temperature detection is difficult in the eddy current heating area in the magnetic coupling, the cooling capacity of the temperature control system 100 is difficult to adapt to the heating power of the eddy current, the magnetic steel 11 is overheated and demagnetized, and the like, and the first temperature sensor 13 and the second temperature sensor 14 are arranged from the near to the far on the axial outer side of the area swept by the projection surface of the magnetic steel 11 on the metal spacer 7, and the temperature measured by a plurality of temperature sensors and the corresponding preset distance are utilized to judge whether to start the cooling module 102 to cool in time, so that the local high temperature problem in the magnetic coupling is effectively avoided, the cooling capacity of the temperature control system 100 is adaptive to the heating power of the eddy current, and the demagnetizing problem of the magnetic steel 11 is avoided.
Specifically:
referring to fig. 3, the preset point is specifically the temperature extreme point a of the side wall of the metal spacer 7 at the central position of the eddy current heating area.
Referring to fig. 4, the control module 101 includes a pre-storing unit 1011, a calculating unit 1012, and a control unit 1013 connected in this order, the first temperature sensor 13 and the second temperature sensor 14 are respectively connected to the calculating unit, and the control unit is connected to the cooling module 102;
a pre-storing unit 1011 for storing a first preset distance, a second preset distance, and a preset temperature control value;
a calculating unit 1012, configured to calculate an extreme temperature of the temperature extreme point a according to the first preset distance, the second preset distance, and the detected temperatures detected by the first temperature sensor 13 and the second temperature sensor 14;
the control unit 1013 is configured to control the on/off of the cooling module 102 according to the extreme temperature and the preset temperature control value, so as to cool the metal spacer 7.
The working principle of the magnetic coupling temperature control system in the embodiment is as follows:
in the process that the outer rotor 6 drives the inner rotor 8 to rotate, the inner rotor and the outer rotor rotate relative to the metal spacer 7, an alternating magnetic field relative to the metal spacer 7 is formed between the magnetic steels 11 of the inner rotor and the outer rotor, the alternating magnetic field can cause eddy currents to be generated in the metal spacer 7, and the eddy currents can cause the metal spacer 7 to be heated; the temperature change in the metal cup 7 is detected by the first temperature sensor 13 and the second temperature sensor 14.
In fig. 3, the temperature measured by the first temperature sensor 13 may be set to T1, the temperature measured by the second temperature sensor 14 may be set to T2, and the first temperature sensor 13 and the second temperature sensor 14 respectively transmit the measured temperature data to the calculating unit 1012 in the temperature control system 100 through electrical connection; since the positions of the first temperature sensor 13 and the second temperature sensor 14 are fixed points, the axial distance between the center point of the first temperature sensor 13 and the center point of the second temperature sensor 14 can be L1 (i.e., the first preset distance).
In the rotation process of the inner rotor and the outer rotor, the temperature of the metal spacer 7 can change along with the change of the rotating speed of the magnetic coupling, and the metal spacer 7 in the temperature rising process can generate a spatial temperature gradient, and the temperature in the metal spacer 7 is approximately in linear distribution which continuously decreases outwards along the eddy current heating area, so that the temperature extreme point a in the metal spacer 7 is positioned at the central position of the eddy current heating area; the temperature of the temperature extreme point a in the metal spacer 7 can be set to be Ta, and the length of the axial distance between the temperature extreme point a and the central point of the first temperature sensor 13 can be set to be L2 (namely, a second preset distance); the calculating unit 1012 in the temperature control system 100 may calculate the temperature extreme point a temperature Ta in the metal spacer 7 according to the temperatures T1 and T2 and the axial distances L1 and L2, where the axial distances L1 and L2 are pre-stored in the pre-storing unit 1011 in the temperature control system 100, and the temperature extreme point a temperature Ta may be determined by the following formula:
，
referring to fig. 5 to fig. 6, the principle of temperature regulation and control of the magnetic coupling and the on-off control logic of the cooling module 102 are shown respectively, and a pre-storing unit 1011 in the temperature control system 100 pre-stores a first temperature control value T3; when the cooling module 102 is not turned on, if the temperature extreme point a temperature Ta in the metal spacer 7 is higher than or equal to the first temperature control value T3, the control unit 1013 controls the cooling module 102 to be turned on, and when the cooling module 102 is not turned on, if the temperature extreme point a temperature Ta in the metal spacer 7 is lower than the first temperature control value T3, the cooling module 102 is not turned on.
The pre-storing unit 1011 in the temperature control system 100 also pre-stores a second temperature control value T4, wherein the temperature of the first temperature control value T3 is higher than the temperature of the second temperature control value T4; when the cooling module 102 is in an open state, a fluid medium with a lower temperature is continuously introduced into a space where the magnetic coupling is located, and when the cooling module is used for cooling control of the magnetic coupling, if the temperature of the temperature extreme point a in the metal spacer 7 is higher than or equal to the temperature of the second temperature control value T4, the cooling module 102 is continuously kept in the open state, and the fluid medium with the lower temperature is introduced into the space where the magnetic coupling is located, so that the cooling of the magnetic coupling is performed; if the temperature extreme point alpha temperature Ta in the metal spacer 7 is lower than the second temperature control value T4, the cooling module 102 is closed.
According to the specific judgment logic for controlling the on/off of the cooling module 102, the cooling module can be prevented from being in the on/off frequent switching state due to temperature fluctuation.
Embodiment two:
referring to fig. 1-3, the present embodiment provides a magnetic pump employing the temperature control system according to the first embodiment, further comprising a housing assembly and a pump driving motor 30; the shell assembly comprises a front pump shell 1 and a rear pump shell 5, a base 40 is fixedly arranged at the bottom of the rear pump shell 5, and the base 40 is used for supporting the whole magnetic pump; the magnetic coupling is arranged in the magnetic pump, a metal spacer 7 in the magnetic coupling is fixedly arranged between the front pump shell 1 and the rear pump shell 5, the metal spacer 7 divides an internal cavity between the front pump shell 1 and the rear pump shell 5 into two mutually separated cavities, namely a pump cavity 2 and a driving cavity 10, and the inner side of the metal spacer 7 is communicated with the pump cavity 2.
An impeller 21 is provided in the pump chamber 2, a suction port 3 and a discharge port 4 communicating with the pump chamber 2 are provided in the front pump housing 1, and when the impeller 21 rotates, fluid outside the pump is sucked into the pump chamber 2 through the suction port 3, and the sucked fluid is discharged outside the pump through the discharge port 4.
The fluid sucked by the pump is sealed in a pump cavity 2 formed by the metal spacer 7 and the front pump shell 1; a pump cover 9 and a pump shaft 22 are also arranged in the pump cavity 2, the pump cover 9 is fixedly arranged at the joint position of the metal spacer 7 and the front pump shell 1, a hole is arranged in the pump cover 9, and fluid sucked into the pump cavity 2 can flow in the whole pump cavity 2 through the hole in the pump cover 9; the pump shaft 22 penetrates through the pump cover 9, the joint part of the pump shaft 22 and the pump cover 9 is connected through a bearing, one end of the pump shaft 22 is fixedly connected with the impeller 21, the other end of the pump shaft 22 is arranged in the metal spacer 7, the joint part of the pump shaft 22 and the inner side of the metal spacer 7 is connected through a bearing, and the inner rotor 8 in the magnetic coupling is fixedly arranged on the pump shaft 22 between the metal spacer 7 and the pump cover 9.
A pump driving motor 30 is arranged on the outer side of the magnetic pump shell, a motor shaft end 25 in the pump driving motor 30 penetrates through the side wall of the rear pump shell 5 and stretches into the driving cavity 10, and an outer rotor 6 in the magnetic coupling is fixedly arranged on the motor shaft end 25; the outer rotor 6 and the inner rotor 8 are respectively provided with magnetic steel 11, the magnetic steel 11 in the outer rotor 6 is magnetically coupled with the magnetic steel 11 in the inner rotor 8, and the outer rotor 6 drives the inner rotor 8 to rotate through magnetic force between the magnetic steels 11.
The first temperature sensor 13 and the second temperature sensor 14 are both arranged on the axial outer side of the area swept by the projection surface of the magnetic steel 11 on the metal spacer 7, so that the temperature sensor is far away from the magnetic field between the inner rotor and the outer rotor, the detection accuracy is improved, and an axial distance along the axial direction of the metal spacer 7 is arranged between the first temperature sensor 13 and the second temperature sensor 14; the first temperature sensor 13 and the second temperature sensor 14 each employ a platinum resistance temperature sensor.
The temperature control system 100 is arranged outside the magnetic pump outer shell, the inlet 26 and the outlet 27 are both arranged in the side wall of the rear pump shell 5 and are communicated with the driving cavity 10, the longitudinal height of the inlet 26 is higher than the top longitudinal height of the outer rotor 6 arranged in the magnetic pump, and the longitudinal height of the outlet 27 is lower than the bottom longitudinal height of the outer rotor 6 arranged in the magnetic pump; the cooling module 102 communicates with the inlet 26 and the outlet 27, respectively.
When the magnetic pump operates, the pump driving motor 30 drives the outer rotor 6 to rotate, the outer rotor 6 drives the inner rotor 8 to rotate through magnetic connection between the magnetic steels 11, the inner rotor 8 drives the impeller 21 to rotate in the pump cavity 2 through the pump shaft 22, the impeller 21 sucks fluid outside the pump into the pump cavity 2 through the suction inlet 3 through rotation, and the sucked fluid is discharged outside the pump through the discharge outlet 4.
In the process that the outer rotor 6 drives the inner rotor 8 to rotate, the inner rotor and the outer rotor rotate relative to the metal spacer 7, an alternating magnetic field relative to the metal spacer 7 is formed between the magnetic steels 11 of the inner rotor and the outer rotor, the alternating magnetic field can cause eddy currents to be generated in the metal spacer 7, and the eddy currents can cause the metal spacer 7 to be heated; the temperature change in the metal cup 7 is detected by the first temperature sensor 13 and the second temperature sensor 14.
In the pump cavity 2, pumped fluid can flow in the whole pump cavity 2 through the holes in the pump cover 9, the inner side of the metal spacer 7 can be in contact with the pumped fluid, and part of heat generated by the eddy current is taken away; however, the fluidity of the fluid between the pump cover 9 and the metal spacer 7 is poor, when the inner rotor and the outer rotor rotate rapidly and the electric vortex flow generates heat rapidly, the fluid sucked by the pump is difficult to cool the metal spacer 7 in time, and the metal spacer 7 still has the problem of high temperature.
The temperature control system 100 is respectively and electrically connected with the first temperature sensor 13 and the second temperature sensor 14, the temperature control system 100 utilizes temperature data measured by the first temperature sensor 13 and the second temperature sensor 14 to calculate the extreme value temperature at the temperature extreme point a in the metal spacer 7, the temperature control system 100 is internally provided with a first temperature control value T3 and a second temperature control value T4, and the extreme value temperature in the metal spacer 7 is compared with the first temperature control value T3 or the second temperature control value T4 to control the on-off state of the cooling module 102; in the process of reducing the temperature of the metal spacer 7, a low-temperature fluid medium in the cooling module 102 is introduced into the driving cavity 10 between the rear pump shell 5 and the metal spacer 7 through the inlet 26, a medium atmosphere which surrounds the magnetic coupling in a semi-wrapping manner is formed, the temperature of the metal spacer 7 is reduced through a heat exchange mode, and the fluid medium after heat exchange is discharged from the space where the magnetic coupling is located through the discharge port 27 and flows back into the cooling module 102.
That is, the magnetic pump provided in this embodiment not only cools the metal spacer 7 by the fluid sucked by the impeller pump, but also cools the metal spacer 7 by the temperature control system 100, and has an excellent cooling effect on the metal spacer 7.
The above examples are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope of the present invention without departing from the design spirit of the present invention.
Claims (9)
1. The temperature control system of the magnetic coupling is characterized by comprising the magnetic coupling and a temperature control system;
the magnetic coupling comprises an outer rotor, an inner rotor and a metal spacer;
the temperature control system comprises a first temperature sensor, a second temperature sensor, a control module and a cooling module, wherein the first temperature sensor and the second temperature sensor are respectively connected with the control module, and the control module is connected with the cooling module;
the outer rotor and the inner rotor are respectively provided with magnetic steel, the magnetic steel in the outer rotor is magnetically coupled with the magnetic steel in the inner rotor, and the metal spacer is arranged between the outer rotor and the inner rotor;
a first temperature sensor and a second temperature sensor are arranged on the axially outer side of a region swept by a projection surface of the magnetic steel on the metal spacer from the near to the far, the second temperature sensor is axially spaced from the first temperature sensor by a first preset distance, and the first temperature sensor is axially spaced from a preset point in the region swept by the projection surface of the magnetic steel on the metal spacer by a second preset distance;
the control module is used for controlling the opening and closing of the cooling module according to the first preset distance and the second preset distance and the detection temperatures obtained by the detection of the first temperature sensor and the second temperature sensor so as to cool the metal spacer bush;
the preset point is specifically the temperature extreme point of the side wall of the metal spacer at the central position of the eddy current heating area.
2. The magnetic coupling temperature control system according to claim 1, wherein the control module comprises a pre-storing unit, a calculating unit and a control unit which are sequentially connected, the first temperature sensor and the second temperature sensor are respectively connected with the calculating unit, and the control unit is connected with the cooling module;
the pre-storing unit is used for storing a first preset distance, a second preset distance and a preset temperature control value;
the calculating unit is used for calculating the extreme value temperature Ta of the temperature extreme point according to the first preset distance and the second preset distance and the detected temperatures obtained by the first temperature sensor and the second temperature sensor;
and the control unit is used for controlling the opening and closing of the cooling module according to the extreme temperature and a preset temperature control value so as to cool the metal spacer bush.
3. The magnetic coupling temperature control system according to claim 2, wherein the extreme value temperature Ta is calculated by the formula:
，
wherein T1 represents a detected temperature detected by the first temperature sensor, T2 represents a detected temperature detected by the second temperature sensor, L1 represents a first preset distance, and L2 represents a second preset distance.
4. The magnetic coupling temperature control system according to claim 2, wherein the preset temperature control values include a first temperature control value T3, a second temperature control value T4, and T3 > T4;
the control logic of the control unit specifically comprises:
when the cooling module is closed, if Ta is more than or equal to T3, the cooling module is started, and if Ta is less than T3, the cooling module is not started;
when the cooling module is started, if Ta is more than or equal to T4, the cooling module is kept in an on state, and if Ta is less than T4, the cooling module is closed.
5. A magnetic pump, characterized by comprising the magnetic coupling temperature control system of any one of claims 1-4, further comprising a housing assembly, a pump drive motor;
the shell assembly comprises a front pump shell and a rear pump shell, the metal spacer bush is fixedly arranged between the front pump shell and the rear pump shell so as to divide an internal cavity between the front pump shell and the rear pump shell into two mutually-separated pump cavities and a driving cavity, the inner rotor is arranged in the pump cavities, and the outer rotor is arranged in the driving cavity;
the pump driving motor is connected with the outer rotor to drive the outer rotor to rotate;
the first temperature sensor and the second temperature sensor are both arranged in the driving cavity, the through inlet and the discharge outlet are both arranged on the side wall of the driving cavity, and the cooling module is respectively communicated with the through inlet and the discharge outlet;
the pump cavity is internally provided with an impeller connected with the inner rotor, and the front pump shell is provided with a suction inlet and a discharge outlet which are communicated with the pump cavity.
6. A magnetic pump according to claim 5, wherein a pump cover and a pump shaft are provided in the pump chamber;
the pump cover is fixedly arranged at the joint position of the metal spacer bush and the front pump shell, and a hole is arranged in the pump cover;
the pump shaft penetrates through the pump cover, the connecting part of the pump shaft and the pump cover is connected through a bearing, one end of the pump shaft is fixedly connected with the impeller, the other end of the pump shaft is connected with the metal spacer through a bearing, and the inner rotor is fixedly arranged on the pump shaft between the metal spacer and the pump cover.
7. A magnetic pump according to claim 5, wherein the motor shaft end of the pump driving motor penetrates the side wall of the rear pump housing and extends into the driving cavity to be connected with the outer rotor so as to drive the outer rotor to rotate.
8. A magnetic pump according to claim 5, wherein a base is fixedly mounted at the bottom of the rear pump housing, the base being adapted to support the entire magnetic pump.
9. A magnetic pump according to claim 5, wherein the inlet is located at a position which is higher than the top longitudinal height of the outer rotor mounted in the magnetic pump, and the discharge is located at a position which is lower than the bottom longitudinal height of the outer rotor mounted in the magnetic pump.
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| CN202111640223.0A CN114263637B (en) | 2021-12-30 | 2021-12-30 | Magnetic coupling temperature control system and magnetic pump adopting same |
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