CN114352546B - Oil pump for speed-adjustable transformer and speed-adjusting system control circuit for oil pump - Google Patents
Oil pump for speed-adjustable transformer and speed-adjusting system control circuit for oil pump Download PDFInfo
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- CN114352546B CN114352546B CN202210027699.5A CN202210027699A CN114352546B CN 114352546 B CN114352546 B CN 114352546B CN 202210027699 A CN202210027699 A CN 202210027699A CN 114352546 B CN114352546 B CN 114352546B
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- 229910000831 Steel Inorganic materials 0.000 claims description 15
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- 238000012545 processing Methods 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 239000011521 glass Substances 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
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- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
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- 238000004134 energy conservation Methods 0.000 abstract description 6
- 238000001914 filtration Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 5
- 230000010354 integration Effects 0.000 abstract description 4
- 238000005461 lubrication Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 24
- 238000001514 detection method Methods 0.000 description 16
- 230000033228 biological regulation Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
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Abstract
The oil pump for the speed-adjustable transformer comprises a pump body with a main body in a rotary shape, wherein the pump body consists of an impeller mounting part and a motor mounting part along the axial direction of a rotary shaft; an oil inlet is formed in one end, axially opposite to the motor mounting part, of the impeller mounting part, an oil outlet is formed in the side face of the impeller mounting part, and a control assembly is arranged at one end, axially opposite to the impeller mounting part, of the motor mounting part; impeller assembly is installed to impeller installation department internally mounted, and motor assembly is installed to motor installation department internally mounted. The impeller component and the motor component are both arranged in the pump body to form the submersible pump, the motor component is in a brushless direct current motor structure, the motor component rotor can be regulated through the control component, so that the impeller component can be regulated, circuits such as rectification, filtering and pulse modulation are arranged in the control component, the integration level is high, the frequency can be regulated by matching with the sensor, the energy conservation and emission reduction can be realized on the premise of achieving the lubrication and cooling effects, and the service life of the oil pump is prolonged.
Description
Technical Field
The invention relates to the field of oil pump pumps for transformers, in particular to an oil pump for a speed-adjustable transformer and a speed-adjusting system control circuit for the oil pump.
Background
The transformer oil pump is mainly used for forcing the transformer oil to circulate in the cooling systems of large transformers, electric furnace transformers, electric locomotive transformers and other special transformers. These oil pumps now conventionally use a three-phase ac motor to perform the energy conversion function.
The rotation speed of the three-phase alternating current motor transformer oil pump is basically unchanged due to the fact that the rotation speed of the motor drives the impeller to be basically unchanged due to the fact that the rotation speed of the three-phase alternating current motor transformer oil pump is related to the electricity utilization frequency and the pole pair number of the motor, and the flow and the lift of the three-phase alternating current motor transformer oil pump are basically unchanged when the three-phase alternating current motor transformer oil pump is matched with a transformer. The oil pump rated flow rate when the transformer design is marked on the nameplate of the general oil pump, the problem is that the oil flow rate of the oil pump at the operation working point is related to the pressure drop of the oil circulation loop, but the oil flow rate of the actual working point of the transformer is always larger than the nominal value, so the actual operation flow rate of the oil pump connected to the transformer is larger than the nominal rated flow rate of the actual design, the power input to the pump is increased, the operation current of the oil pump is increased, and the service life of the oil pump is greatly reduced when the current in the actual operation exceeds the rated current because the three-phase motor power has selected a fixed rated value.
The overall ambient temperature of the transformer may change in winter, high altitude, high cold areas or rain, and since the flow and lift of the pump are not changed, the cooling capacity of the oil pump far exceeds the capacity required by the transformer when the three-phase ac submersible pump is connected to the transformer in these environments. At this time, if the rotation speed of the submersible pump is changed to reduce the rotation speed of the pump, the flow rate of the oil is reduced, and the cooling requirement of the transformer in operation can be met, so that the energy-saving effect can be achieved.
Because the rotation speed of the three-phase alternating current submersible pump is not adjustable, negative pressure is often generated in certain places of the transformer due to the fact that the rotation speed is too high at the moment of starting the oil pump, the sealing of the transformer is damaged due to the negative pressure, and serious accidents such as leakage of transformer oil are caused.
In order to achieve the speed regulation of the oil pump, there are currently two ways:
1. the flexible frequency converter is added outside the oil-submerged pump, so that the rotating speed reaches the aim of being slow to fast when the oil-submerged pump is started to operate, and the transformer does not produce negative pressure;
2. by changing the pole number of the motor, when the oil temperature is high, the rotation speed of the oil pump is increased by switching to the high pole number, so that the purpose of changing the rotation speed of the impeller of the oil pump is achieved.
Both of the above approaches have drawbacks and disadvantages:
1. when the frequency or voltage of the oil pump is changed, the wire diameter of the enameled wire of the three-phase alternating-current oil pump needs to be correspondingly adjusted due to the change of the current density, if the enameled wire needs to be selected to be larger or smaller, the enameled wire can be burnt out, and therefore the service life of the oil pump is greatly influenced by the flexible frequency conversion;
2. the pole number of the motor is changed from high to low or from low to high, so that the volume of the motor is much larger than that of a conventional three-phase motor, and the pump is only fixed to operate at different fixed rotating speeds by changing the pole number, so that the aim of randomly changing different rotating speeds can not be achieved, and the energy-saving requirement is not met.
When the transformer is changed under different weather conditions or different temperature rises, the corresponding oil pump working point also drifts along with the change of the temperature curve of the transformer, for example, the working point drifts when the ambient temperature drops (such as suddenly rains). Therefore, the rotating speed of the oil pump is controlled by receiving a temperature change signal of the top layer of the transformer oil through the temperature sensor according to the change of the temperature of the top layer of the transformer oil, so that the oil pump is used for conveying oil, the transformer is enabled to reach a stable temperature rise state through dynamic change, intelligent control of the transformer is realized, linear matching of the transformer, the radiator and the oil pump is realized, and the purposes of saving energy, reducing emission and prolonging the service life of the transformer are achieved.
Therefore, the invention designs the oil pump for the transformer, which is used for controlling the rotating speed of the oil pump, the oil immersed type oil pump and the like under the requirements of not changing the wire diameter of the enameled wire of the motor by receiving the temperature change signal of the top layer of the transformer oil through the temperature sensor, and the oil pump is a problem to be solved urgently.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the oil pump for the speed-adjustable transformer, and the impeller component and the motor component of the oil pump for the speed-adjustable transformer are both arranged in the pump body to form the submersible pump, and the motor component is in a brushless direct current motor structure, and can regulate the speed of the rotor of the motor component through the control component, so that the speed of the impeller component is regulated; the control component is internally provided with circuits such as rectification, filtering, pulse modulation and the like, has high integration level, and can realize frequency adjustment by being matched with the sensor so as to meet the oil flow requirements of the transformer under different working conditions, realize energy conservation and emission reduction on the premise of achieving the cooling effect and prolong the service life of the oil pump; in addition, the invention also provides a control circuit of the speed regulating system for the oil pump, after the central control circuit detects that the signal of the current detection circuit is compared with the signal of the rotor position detection circuit, the central control circuit outputs pulse signals to the PWM pulse modulation driving circuit, the PWM pulse modulation driving circuit controls the on-off of a switching tube of the electronic switching circuit, alternating square wave current is input into a stator winding, the change of the switching frequency causes the change of the rotating speed of the motor, thereby driving the change of the rotating speed of the impeller, further achieving the change of the oil flow in the oil circuit of the transformer, effectively overcoming the change of the transformer due to factors such as environmental temperature, and effectively matching the heat dissipation of the transformer with the energy consumption of the oil pump.
The specific technical scheme of the invention is as follows: the oil pump for the speed-adjustable transformer comprises a pump body with a main body in a rotary shape, wherein the pump body consists of an impeller mounting part and a motor mounting part along the axial direction of a rotary shaft; an oil inlet is formed in one end, axially opposite to the motor mounting part, of the impeller mounting part, an oil outlet is formed in the side face of the impeller mounting part, and a control assembly is arranged at one end, axially opposite to the impeller mounting part, of the motor mounting part; impeller assembly is installed to impeller installation department internally mounted, motor assembly is installed to motor installation department internally mounted.
Therefore, the impeller assembly and the motor assembly are both arranged in the pump body to form a submersible pump, the motor assembly is in a brushless direct current motor structure, and the motor assembly rotor can be regulated through the control assembly, so that the impeller assembly is regulated; the control assembly is internally provided with circuits such as rectification, filtering, pulse modulation and the like, the integration level is high, and the control assembly is matched with the sensor to realize frequency adjustment so as to meet the oil flow requirements of the transformer under different working conditions, realize energy conservation and emission reduction under the premise of achieving the cooling effect, and prolong the service life of the oil pump.
As the preferable mode of the invention, one end of the pump body, which is connected with the control assembly, is provided with an oil pump base, and the control assembly comprises a connecting bottom plate; the connecting bottom plate is fixedly connected with the oil pump base through bolts and is sealed through an O-shaped ring.
Therefore, a seal is formed between the pump body and the connecting bottom plate, and oil cannot flow into the control assembly from the pump body.
Preferably, the connecting bottom plate extends to the inside of the pump body from the center, a fixed shaft is further installed in the pump body, the fixed shaft is coaxial with the pump body rotating shaft, one end of the fixed shaft is inserted into the connecting cylinder and then fixedly connected with the connecting cylinder, and the impeller assembly and the motor assembly are installed by taking the fixed shaft as the axis.
Therefore, the fixed shaft is used as the main shaft of the impeller assembly and the motor assembly at the same time, so that the structure is compact and stable, parts of the motor assembly, the impeller assembly and the fixed shaft are all soaked in the medium oil of the transformer, the lubricity of the rotating bearing is effectively ensured, and the service life of the oil pump is greatly prolonged.
Preferably, the impeller assembly comprises an impeller and a bearing, wherein the bearing is an angular contact bearing and is arranged between the fixed shaft and the impeller.
Therefore, the bearing can overcome axial force generated by rotation by using the angular contact bearing, and the impeller is ensured to work stably.
Preferably, the impeller comprises an oil inlet port and an oil outlet port, wherein the oil inlet port is opposite to the oil inlet and is in clearance fit with the inner wall of the oil inlet, the oil outlet port and the oil outlet are opposite to the oil outlet in the rotation process of the impeller, and the oil inlet port and the oil outlet port are communicated inside.
Therefore, negative pressure can be generated at the oil inlet port in the rotation process of the impeller, oil in the oil inlet is sucked into the impeller from the oil inlet port, centrifugal force is generated by rotation of the impeller, so that oil pressure is generated at the oil outlet port, the oil is sprayed out from the oil outlet port, the oil outlet port is opposite to the oil outlet, and the pressure loss is small when the oil flows out from the oil outlet.
Preferably, the motor assembly comprises a stator and a rotor, wherein the stator, the oil pump base and the connecting bottom plate are fixed through bolts, the section of the rotor is L-shaped, the motor assembly comprises a rotor main body part covered on the radial outer side of the stator and a rotor extension part covered on one side of the stator close to the impeller, the rotor extension part and the impeller are fixedly connected through bolts, and the rotor main body part and the rotor extension part are integrated with rare earth permanent magnets.
Therefore, the motor component is in a structural form of a direct-current brushless outer rotor motor, the section of the rotor is L-shaped, the inner space of the motor installation part can be fully utilized, and the connection structure of the rotor and the impeller is simple while sufficient torque is ensured.
As the preferable mode of the invention, the connecting bottom plate is provided with a connecting wire opening, the connecting wire opening is covered and provided with an iron seal glass wiring board, and the iron seal glass wiring board is fixedly connected with the connecting bottom plate through bolts and is sealed through an O-shaped ring.
The iron-clad glass connection plate thus enables the current input of the control assembly to the motor assembly and the output of the motor rotational speed signal in the sealed condition.
As the optimization of the invention, the side surface of the fixed shaft is provided with a fixed steel ball mounting counter bore, the fixed steel ball mounting counter bore is internally provided with a fixed steel ball for the shaft, the inner wall of the connecting cylinder body is provided with a fixed clamping groove, and the fixed steel ball for the shaft is clamped into the fixed clamping groove; the fixed shaft is inserted into one end of the connecting cylinder body and connected with the connecting bottom plate through bolts.
The translational movement of the fixed shaft is restrained by the bolt connection, and the rotation of the fixed shaft is restrained by the fixed steel balls, so that the fixed shaft assembly structure is simple and stable.
As a preferred mode of the invention, the control assembly further comprises a central processing unit PCBA arranged on the connecting bottom plate and a PCB protective cover covering the outside of the central processing unit PCBA; the motor assembly further includes a hall positioning sensor; the oil pump for the speed-adjustable transformer further comprises a temperature sensor, and the temperature sensor is arranged on the oil top layer of the transformer; and the central processing unit PCBA receives the electric signals of the Hall positioning sensor and the temperature sensor.
Therefore, the Hall positioning sensor is used for detecting the position of the rotor so as to calculate the rotating speed of the rotor, the temperature sensor is used for detecting the temperature of oil in the top layer of the transformer, if the temperature is higher, the central processing unit PCBA is used for controlling the rotating speed of the rotor to be increased, and after the temperature is reduced, the central processing unit PCBA is used for controlling the rotating speed of the rotor to be reduced, so that the self-adaptive control of the medium oil circulation speed of the transformer is realized, the energy conservation and the emission reduction are realized on the premise of ensuring the lubrication and cooling effects, and the service life of the oil pump is prolonged.
The control circuit of the speed regulating system comprises a rectification filter circuit, a control power supply circuit, a central control circuit, a PWM pulse modulation driving circuit, an electronic switch circuit and a current detection circuit; the motor assembly includes a rotor position detection circuit; the rectification filter circuit transmits filter current to the control power supply circuit, the control power supply circuit outputs current to the central control circuit, the central control circuit outputs current and control signals to the PWM pulse modulation driving circuit, the PWM pulse modulation driving circuit outputs current to the electronic switch circuit, the electronic switch circuit outputs signals to the current detection circuit, and the current detection circuit outputs signals to the central control circuit; the Hall positioning sensor receives the signal of the electronic switch circuit, and the rotor position detection circuit receives the signal of the Hall positioning sensor and outputs the signal to the central control circuit; the temperature sensor outputs a signal to the central control circuit.
Therefore, after the central control circuit detects that the signals of the current detection circuit and the signals of the rotor position detection circuit are compared, the central control circuit outputs pulse signals to the PWM pulse modulation driving circuit, the PWM pulse modulation driving circuit controls the on-off of a switching tube of the electronic switching circuit, alternating square wave current is input into a stator winding, the change of the switching frequency causes the change of the rotating speed of the motor, so that the change of the rotating speed of the impeller is driven, the change of the oil flow in a transformer oil way is further achieved, the change of the transformer due to factors such as environmental temperature is effectively overcome, and the heat dissipation of the transformer is effectively matched with the energy consumption of an oil pump.
In summary, the invention has the following beneficial effects:
1. the oil pump is compact in structure and achieves the purpose of speed regulation by combining the oil pump and the brushless direct current motor technology;
2. the stator part of the brushless direct current motor is provided with a Hall position sensor, and the stator, the rotor, the impeller and other parts of the brushless direct current motor are soaked in the medium oil of the transformer, so that the lubricity of the rotating bearing is effectively ensured, and the service life of the oil pump is greatly prolonged;
3. the central processing unit PCBA is applicable to working conditions of various single-phase and three-phase alternating currents with different voltages, frequencies, and is rectified into a stable direct current power supply through rectification, filtering and voltage stabilization, the stable direct current power supply is supplied to a central control main board, a temperature sensor of a transformer receives different temperature change signals of a transformer oil top layer, the temperature signals are transmitted to the central control main board, the central controller gives a Pulse Width Modulation (PWM) circuit according to temperature change, and a PWM control motor switch circuit (MOS tube) carries out phase switching, so that the purpose of controlling the rotating speed of a motor is further achieved.
4. The stator, rotor, etc. of the oil pump are immersed in oil to be fully sealed, one is convenient for lubrication of the oil pump bearing, and the other is to prevent leakage of transformer oil.
Drawings
FIG. 1 is a semi-sectional view of an oil pump for an adjustable speed transformer of the present invention;
FIG. 2 is a schematic diagram of current and signal delivery for a control circuit of the speed regulation system of the present invention;
in the figure, 1-pump body, 11-impeller mounting part, 12-motor mounting part, 13-oil pump base, 14-connection cylinder, 141-fixed clamping groove, 15-fixed shaft, 151-fixed steel ball for shaft, 2-oil inlet, 3-oil outlet, 4-control component, 41-connection bottom plate, 411-wire opening, 42-iron seal glass wiring board, 43-central processing unit PCBA, 44-PCB board protection cover, 5-impeller component, 51-impeller, 511-oil inlet port, 512-oil outlet port, 52-bearing, 6-motor component, 61-stator, 62-rotor, 621-rotor main body part, 622-rotor extension part.
Description of the embodiments
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings.
As shown in fig. 1, the oil pump for the speed-adjustable transformer comprises a pump body 1 with a main body in a rotary shape, wherein the pump body 1 consists of an impeller mounting part 11 and a motor mounting part 12 along the axial direction of a rotary shaft; an oil inlet 2 is formed in one end of the impeller mounting part 11, which is axially opposite to the motor mounting part 12, an oil outlet 3 is formed in the side face of the impeller mounting part 11, and a control component 4 is arranged in one end of the motor mounting part 12, which is axially opposite to the impeller mounting part 11; impeller assembly 5 is installed inside impeller mounting portion 11, and motor assembly 6 is installed inside motor mounting portion 12.
Therefore, the impeller assembly 5 and the motor assembly 6 are both arranged in the pump body 1 to form a submersible pump, the motor assembly 6 is in a brushless direct current motor structure, and the rotor of the motor assembly 6 can be regulated through the control assembly 4, so that the impeller assembly 5 can be regulated; the control component 4 is internally provided with circuits such as rectification, filtering, pulse modulation and the like, so that the integration level is high, and the control component is matched with a sensor to realize frequency adjustment, so that the oil flow requirements of the transformer under different working conditions are met, the energy conservation and emission reduction are realized on the premise of achieving the cooling effect, and the service life of the oil pump is prolonged.
As shown in fig. 1, an oil pump base 13 is arranged at one end of the pump body 1 connected with the control assembly 4, and the control assembly 4 comprises a connecting bottom plate 41; the connecting bottom plate 41 and the oil pump base 13 are fixedly connected through bolts and sealed through O-rings.
Thereby, a seal is formed between the pump body 1 and the connection base plate 41, and oil does not flow from the pump body 1 into the control assembly 4.
As shown in fig. 1, a connecting cylinder 14 extends from the center of the connecting bottom plate 41 into the pump body 1, a fixed shaft 15 is also installed in the pump body 1, the fixed shaft 15 is coaxial with the rotating shaft of the pump body 1, one end of the fixed shaft 15 is inserted into the connecting cylinder 14 and then fixedly connected, and the impeller assembly 5 and the motor assembly 6 are installed by taking the fixed shaft 15 as the axis.
Therefore, the fixed shaft 15 is used as the main shaft of the impeller assembly 5 and the motor assembly 6 at the same time, so that the structure is compact and stable, and parts of the motor assembly 6, the impeller assembly 5 and the fixed shaft 15 are all soaked in the medium oil of the transformer, so that the lubricity of the rotating bearing is effectively ensured, and the service life of the oil pump is greatly prolonged.
As shown in fig. 1, the impeller assembly 5 includes an impeller 51 and a bearing 52, and the bearing 52 is an angular contact bearing mounted between the fixed shaft 14 and the impeller 51.
Therefore, the bearing 52 can overcome the axial force generated by rotation by using the angular contact bearing, and the impeller 51 can work stably.
As shown in fig. 1, the impeller 51 includes an oil inlet port 511 and an oil outlet port 512, the oil inlet port 511 is opposite to the oil inlet 2 and is in clearance fit with the inner wall of the oil inlet 2, the oil outlet port 512 and the oil outlet 3 are opposite to the oil outlet 3 in the rotation process of the impeller 51, and the oil inlet port 511 and the oil outlet port 512 are communicated.
Therefore, negative pressure is generated at the oil inlet port 511 in the rotation process of the impeller 51, oil in the oil inlet 2 is sucked into the impeller 51 from the oil inlet port 511, centrifugal force is generated by rotation of the impeller 51, oil pressure is generated at the oil outlet port 512, the oil is sprayed out from the oil outlet port 512, the oil outlet port 512 is opposite to the oil outlet 3, and the pressure loss is small when the oil flows out from the oil outlet 3.
As shown in fig. 1, the motor assembly 6 includes a stator 61 and a rotor 62, the stator 61 is fixed to the oil pump base 13 and the connection base plate 41 by bolts, the cross section of the rotor 62 is L-shaped, the motor assembly includes a rotor main body 621 covering the radial outer side of the stator 61 and a rotor extension 622 covering the side of the stator 61 close to the impeller 51, the rotor extension 622 is fixed to the impeller 51 by bolts, and the rotor main body 621 and the rotor extension 622 are integrally formed of rare earth permanent magnets.
Therefore, the motor assembly 6 is in a structure form of a direct-current brushless outer rotor motor, the section of the rotor 62 is L-shaped, the inner space of the motor mounting part 12 can be fully utilized, and the connection structure of the rotor 62 and the impeller 51 is simple while sufficient torque is ensured.
As shown in fig. 1, a connection opening 411 is formed on the connection bottom plate 41, an iron seal glass wiring board 42 is mounted on the connection opening 411 in a covering manner, and the iron seal glass wiring board 42 is fixedly connected with the connection bottom plate 41 through bolts and sealed through an O-ring.
The iron-clad glass connection plate 42 thus provides for the current input of the control module 4 to the motor module 6 and the output of the motor rotational speed signal in the sealed state.
As shown in fig. 1, a fixed steel ball mounting counter bore is formed in the side surface of the fixed shaft 15, a fixed steel ball 151 for a shaft is mounted in the fixed steel ball mounting counter bore, a fixed clamping groove 141 is formed in the inner wall of the connecting cylinder 14, and the fixed steel ball 151 for the shaft is clamped into the fixed clamping groove 141; the fixed shaft 15 is inserted into one end of the connecting cylinder 14 and connected with the connecting bottom plate 41 through bolts.
The translational movement of the fixed shaft 15 is restrained by the bolt connection, and the rotation of the fixed shaft 15 is restrained by the fixed steel balls 151, so that the simple and stable assembly structure of the fixed shaft 15 is ensured.
As shown in fig. 1, the control assembly 4 further includes a central processor PCBA43 mounted on the connection base plate 41, and a PCB board protection cover 44 covering the outside of the central processor PCBA 43; the motor assembly 6 also includes a hall positioning sensor; the oil pump for the speed-adjustable transformer further comprises a temperature sensor, and the temperature sensor is arranged on the oil top layer of the transformer; the central processing unit PCBA43 receives the electrical signals of the hall positioning sensor and the temperature sensor.
Therefore, the Hall positioning sensor is used for detecting the position of the rotor 62, so as to calculate the rotating speed of the rotor 62, the temperature sensor is used for detecting the temperature of the top layer oil of the transformer, if the temperature is higher, the rotating speed of the rotor 62 is controlled by the central processing unit PCBA43, and after the temperature is reduced, the rotating speed of the rotor 62 is controlled by the central processing unit PCBA43 to be reduced, so that the self-adaptive control of the medium oil circulation speed of the transformer is realized, the energy conservation and the emission reduction are realized on the premise of ensuring the lubrication and cooling effects, and the service life of the oil pump is prolonged.
As shown in fig. 2, the speed regulation system control circuit is used for the oil pump for the speed-adjustable transformer, and the central processing unit PCBA43 comprises a rectifying and filtering circuit, a control power supply circuit, a central control circuit, a PWM pulse modulation driving circuit, an electronic switch circuit and a current detection circuit; the motor assembly 6 includes a rotor position detection circuit; the rectification filter circuit transmits the filtered current to the control power supply circuit, the control power supply circuit outputs current to the central control circuit, the central control circuit outputs current and control signals to the PWM pulse modulation driving circuit, the PWM pulse modulation driving circuit outputs current to the electronic switch circuit, the electronic switch circuit outputs signals to the current detection circuit, and the current detection circuit outputs signals to the central control circuit; the Hall positioning sensor receives signals of the electronic switch circuit, and the rotor position detection circuit receives signals of the Hall positioning sensor and outputs the signals to the central control circuit; the temperature sensor outputs a signal to the central control circuit.
Therefore, after the central control circuit detects that the signal of the current detection circuit is compared with the signal of the rotor position detection circuit, the central control circuit outputs pulse signals to the PWM pulse modulation driving circuit, the PWM pulse modulation driving circuit controls the on-off of a switching tube of the electronic switching circuit, alternating square wave current is input into a stator winding, the change of the rotating speed of the motor is caused by the change of the switching frequency, and the change of the rotating speed of the impeller is driven, so that the change of the oil flow in a transformer oil way is further achieved, and the change of the transformer due to the factors such as ambient temperature and the like is effectively overcome, so that the heat dissipation of the transformer is effectively matched with the energy consumption of an oil pump.
The above examples are only illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical scheme of the present invention will fall within the protection scope of the present invention without departing from the design concept of the present invention, and the technical content of the present invention is fully described in the claims.
Claims (5)
1. Oil pump for adjustable speed transformer, its characterized in that: the device comprises a pump body (1) with a main body in a rotary shape, wherein the pump body (1) consists of an impeller mounting part (11) and a motor mounting part (12) along the axial direction of a rotary shaft; an oil inlet (2) is formed in one end, axially opposite to the motor mounting part (12), of the impeller mounting part (11), an oil outlet (3) is formed in the side face of the impeller mounting part (11), and a control component (4) is arranged at one end, axially opposite to the impeller mounting part (11), of the motor mounting part (12); the impeller assembly (5) is arranged in the impeller mounting part (11), and the motor assembly (6) is arranged in the motor mounting part (12); one end, connected with the control assembly (4), of the pump body (1) is provided with an oil pump base (13), and the control assembly (4) comprises a connecting bottom plate (41); the connecting bottom plate (41) is fixedly connected with the oil pump base (13) through bolts and is sealed through an O-shaped ring; the connecting bottom plate (41) extends to the inside of the pump body (1) from the center, a fixed shaft (15) is further installed in the pump body (1), the fixed shaft (15) and the rotary shaft of the pump body (1) are coaxial, one end of the fixed shaft (15) is inserted into the connecting cylinder (14) and then fixedly connected, and the impeller assembly (5) and the motor assembly (6) are installed by taking the fixed shaft (15) as an axis; the impeller assembly (5) comprises an impeller (51) and a bearing (52), wherein the bearing (52) is an angular contact bearing and is arranged between the fixed shaft (14) and the impeller (51); the motor assembly (6) comprises a stator (61) and a rotor (62), wherein the stator (61) is fixed with the oil pump base (13) and the connecting base plate (41) through bolts, the section of the rotor (62) is L-shaped, and the rotor assembly comprises a rotor main body part (621) covering the radial outer side of the stator (61) and a rotor extension part (622) covering the rotor main body part (61) close to one side of the impeller (51), the rotor extension part (622) is fixedly connected with the impeller (51) through bolts, and the rotor main body part (621) and the rotor extension part (622) are integrated with rare earth permanent magnets.
2. The oil pump for an adjustable speed transformer according to claim 1, wherein: the impeller (51) comprises an oil inlet port (511) and an oil outlet port (512), the oil inlet port (511) is opposite to the oil inlet (2) and in clearance fit with the inner wall of the oil inlet (2), the oil outlet port (512) and the oil outlet (3) are in a state opposite to the oil outlet (3) in the rotation process of the impeller (51), and the oil inlet port (511) is communicated with the inside of the oil outlet port (512).
3. The oil pump for an adjustable speed transformer according to claim 1, wherein: connection opening (411) have been seted up on connecting bottom plate (41), iron seal glass wiring board (42) are installed in the cover on connection opening (411), iron seal glass wiring board (42) with connect between bottom plate (41) through the bolt rigid coupling to seal through O shape circle.
4. The oil pump for an adjustable speed transformer according to claim 1, wherein: a fixed steel ball mounting counter bore is formed in the side face of the fixed shaft (15), a fixed steel ball (151) for a shaft is mounted in the fixed steel ball mounting counter bore, a fixed clamping groove (141) is formed in the inner wall of the connecting cylinder body (14), and the fixed steel ball (151) for the shaft is clamped into the fixed clamping groove (141); the fixed shaft (15) is inserted into one end of the connecting cylinder (14) and connected with the connecting bottom plate (41) through bolts.
5. The oil pump for an adjustable speed transformer according to any one of claims 1 to 4, wherein: the control assembly (4) further comprises a central processing unit PCBA (43) arranged on the connecting bottom plate (41), and a PCB protective cover (44) covering the outside of the central processing unit PCBA (43); the motor assembly (6) further comprises a hall positioning sensor; the oil pump for the speed-adjustable transformer further comprises a temperature sensor, and the temperature sensor is arranged on the oil top layer of the transformer; the central processing unit PCBA (43) receives the electric signals of the Hall positioning sensor and the temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210027699.5A CN114352546B (en) | 2022-01-11 | 2022-01-11 | Oil pump for speed-adjustable transformer and speed-adjusting system control circuit for oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210027699.5A CN114352546B (en) | 2022-01-11 | 2022-01-11 | Oil pump for speed-adjustable transformer and speed-adjusting system control circuit for oil pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114352546A CN114352546A (en) | 2022-04-15 |
| CN114352546B true CN114352546B (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210027699.5A Active CN114352546B (en) | 2022-01-11 | 2022-01-11 | Oil pump for speed-adjustable transformer and speed-adjusting system control circuit for oil pump |
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| Country | Link |
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| CN (1) | CN114352546B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202883190U (en) * | 2012-11-07 | 2013-04-17 | 狄家峰 | Brushless fuel pump |
| CN103269143A (en) * | 2013-05-06 | 2013-08-28 | 德清县金宇达电气有限公司 | Two-phase brushless direct current motor |
| CN213205964U (en) * | 2020-09-17 | 2021-05-14 | 福建福州闽大机械制造有限公司 | Avoid oil pump cover of revealing |
| CN113389740A (en) * | 2021-05-26 | 2021-09-14 | 广东百威电子有限公司 | Circulating pump control circuit and circulating pump |
| CN113586465A (en) * | 2021-08-24 | 2021-11-02 | 浙江尔格科技股份有限公司 | Intelligent oil pump and forced oil circulation cooling system of transformer |
-
2022
- 2022-01-11 CN CN202210027699.5A patent/CN114352546B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202883190U (en) * | 2012-11-07 | 2013-04-17 | 狄家峰 | Brushless fuel pump |
| CN103269143A (en) * | 2013-05-06 | 2013-08-28 | 德清县金宇达电气有限公司 | Two-phase brushless direct current motor |
| CN213205964U (en) * | 2020-09-17 | 2021-05-14 | 福建福州闽大机械制造有限公司 | Avoid oil pump cover of revealing |
| CN113389740A (en) * | 2021-05-26 | 2021-09-14 | 广东百威电子有限公司 | Circulating pump control circuit and circulating pump |
| CN113586465A (en) * | 2021-08-24 | 2021-11-02 | 浙江尔格科技股份有限公司 | Intelligent oil pump and forced oil circulation cooling system of transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114352546A (en) | 2022-04-15 |
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