CN115962125A - Driving device of screw pump - Google Patents
Driving device of screw pump Download PDFInfo
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- CN115962125A CN115962125A CN202111529062.8A CN202111529062A CN115962125A CN 115962125 A CN115962125 A CN 115962125A CN 202111529062 A CN202111529062 A CN 202111529062A CN 115962125 A CN115962125 A CN 115962125A
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Abstract
The invention relates to the technical field of screw pumps, in particular to a driving device of a screw pump, which comprises a direct drive motor, a square clamping sub assembly, a square clamping sub shield, a bearing box, a mechanical sealing device, a support and a variable frequency control cabinet, wherein the variable frequency control cabinet is provided with a central control unit.
Description
Technical Field
The invention relates to the technical field of screw pumps, in particular to a driving device of a screw pump.
Background
The screw pump is one of the important devices for oil exploitation, the screw pump can lift crude oil at the bottom of a well to the ground to process the crude oil, the screw pump is used as a driving device through a direct drive motor and auxiliary parts, however, most of the existing driving devices cannot automatically detect the problems of the device in the operation process.
Chinese patent publication No.: CN211692811U discloses a screw pump drive arrangement, including mount pad, motor and second pivot, the top welding of mount pad has first gag lever post, the inside one side of keeping away from first gag lever post of cavity is pasted and is had first spring, the inside bottom of cavity is pasted and is had the second spring, the one end fixed mounting that the second spring was kept away from to the action bars has the carousel, one side fixed mounting of device main part has the motor, movable mounting has the second pivot in the device main part of first pivot below, the inside of mounting groove is pasted and is had the third spring, the cover is established in the second pivot in the first stopper outside and is installed the ring gear, movable mounting has reciprocal lead screw in the device main part of second pivot below. This screw pump drive arrangement utilizes spacing fixed mode to fix it on the base, is difficult to take place to become flexible because of vibrations to and can carry out elastic braking voluntarily, labour saving and time saving, and can avoid the too big device of causing the damage of braking force.
It can be seen that the above technical solution has the following problems:
1. the problem existing in the driving device cannot be judged according to the internal condition of the driving device during operation, and the driving device has low operation efficiency;
2. the issue of torque release is not considered.
Disclosure of Invention
Therefore, the invention provides a driving device of a screw pump, which is used for solving the problem of low operation efficiency of the driving device caused by the fact that the actual internal condition of the driving device cannot be accurately judged according to the internal condition of the driving device in operation in the prior art.
To achieve the above object, the present invention provides a driving apparatus of a screw pump, comprising:
the direct drive motor comprises a stator and a rotor with a hollow shaft structure and is used for driving the screw pump to operate;
the square clamping sub-assembly is positioned above the direct drive motor and connected with the direct drive motor through a bolt, and is used for releasing overlarge torque generated in the working process of the direct drive motor;
a square card shield isolating the square card assembly from an external environment;
the bearing box is a box body part and is used for supporting the direct drive motor and lubricating the bearings, a plurality of bearings and oil feeding devices are arranged in the bearing box, and the oil feeding devices are used for providing lubricating oil for the bearings in the bearing box;
a mechanical seal device for preventing air from leaking into the driving device;
the detection device comprises an acoustic frequency tester and an ammeter and is used for detecting relevant parameters of the driving device in the operation process;
the bracket is used for supporting the screw pump driving device;
the variable frequency control cabinet comprises a central control module and a control panel and is used for starting and stopping the driving device, monitoring the operation parameters of the driving device and adjusting the driving device; the central control module controls the sound frequency tester to detect the sound frequency in the driving device when the driving device runs and compares the sound frequency with the preset sound frequency so as to preliminarily judge whether an abnormal condition exists in the driving device, if the central control module judges that the abnormal condition exists in the driving device, the central control module reduces the rotating speed of the direct drive motor through a potentiometer and detects the sound frequency in the driving device after the rotating speed is reduced so as to further judge the reason of the abnormal condition of the driving device and carry out corresponding treatment aiming at different reasons, and when the driving device generates the abnormal condition, the central control module detects the current of the direct drive motor so as to judge whether the direct drive motor is overloaded or not or whether the output shaft of the direct drive motor is overloaded or not so as to judge whether the rotating speed treatment is carried out on the direct drive motor or not.
Further, the sound wave spectrum tester detects the frequency f of sound generated when the driving device operates in real time and transmits the detected sound frequency f to the central control module, and the central control module judges the operating condition of the driving device according to the detected sound frequency f;
the central control module is provided with a first preset sound frequency f1, compares the detected sound frequency f with the first preset sound frequency f1 and judges the running condition of the driving device according to the comparison result;
if f is less than or equal to f1, the central control module judges that the driving device normally operates without abnormal conditions;
if f is larger than f1, the central control module preliminarily judges that an abnormal condition occurs in the running process of the driving device and further judges the reason of the abnormal condition.
Further, the central control module is provided with a second preset sound frequency f2, a third preset sound frequency f3 and a motor rotating speed adjusting coefficient n0, wherein f2 is less than f3, when the central control module preliminarily judges that the driving device has an abnormal condition in the operation process, the central control module reduces the rotating speed of the direct drive motor to a corresponding value by using the motor rotating speed adjusting coefficient n0, controls the sound wave frequency spectrum tester to detect the sound frequency f 'generated when the direct drive motor operates after the rotating speed is reduced again, and further judges the operation condition of the driving device according to the section where f' is located;
if f' is less than or equal to f2, the central control module judges that the reason of generating the abnormal condition is that the rotating speed of the direct drive motor is overhigh, and the central control module further judges whether the rotating speed of the direct drive motor needs to be further adjusted according to the current of the direct drive motor in the running process;
if f2 is more than f' and less than or equal to f3, the central control module judges that the reason of the abnormal condition is loss of lubricating oil of a bearing in the bearing box, controls the oil supply device to supply oil to the bearing with the loss of the lubricating oil, and judges the operation condition of the driving device again after the oil supply;
if f' is greater than f3, the central control module judges that the reason of the abnormal condition is the damage of the direct drive motor, and the central control module controls the direct drive motor to stop running and sends a direct drive motor damage warning to inform workers to check and maintain the direct drive motor.
Furthermore, the oil feeding device is provided with a preset oil feeding amount L0, when the central control module judges that the lubricating oil of the bearing in the bearing box is deficient, the central control module controls the oil feeding device to supply oil to the bearing in the bearing box and sets the oil feeding amount to be L0, and after the oil feeding of the oil feeding device is completed, the central control module controls the acoustic frequency f' emitted by the driving device after the oil supply is completed to be detected by the acoustic frequency spectrum tester so as to further judge the operation condition of the driving device;
if f is less than or equal to f1, the central control module judges that the reason of generating the abnormal condition is loss of bearing lubricating oil in the bearing box and judges that the abnormal condition is solved;
if f is larger than f1, the central control module judges that the reason of the abnormal condition is the damage of the direct drive motor and sends out a direct drive motor damage alarm to inform workers of checking and maintenance.
Further, the central control module is also provided with a motor rated current I0, the ammeter is used for detecting and recording the current I flowing through the stator and the rotor of the direct drive motor in real time and transmitting the current I to the central control module, and when the central control module judges that the reason of generating the abnormal condition is that the rotating speed of the direct drive motor is overhigh, the central control module compares the current I' of the direct drive motor when the rotating speed is not regulated, which is transmitted by the ammeter, with the motor rated current I0 and judges whether the rotating speed of the direct drive motor needs to be further regulated or not according to the comparison;
if I ' > I0, the central control module judges that the direct drive motor is overloaded or the output shaft of the direct drive motor is overloaded before the rotating speed of the direct drive motor is adjusted, calculates the difference value delta I between I ' and I0 and further judges the problems of the direct drive motor according to the delta I, and sets delta I = I ' -I0;
if I' is less than or equal to I0, the central control module judges that the direct drive motor operates normally.
Further, the central control module is provided with a preset current difference value delta I0, when I' is greater than I0, the central control module compares the delta I with the delta I0 and further judges the problems of the direct drive motor according to the comparison result;
if the delta I is less than or equal to the delta I0, the central control module preliminarily judges that the direct drive motor is overloaded, and the central control module further judges whether the rotating speed of the direct drive motor needs to be further adjusted according to the motor current I' after the rotating speed is adjusted and the preset current I0;
if delta I is larger than delta I0, the central control module judges that the direct drive motor is overloaded, and the central control module sends out a motor overload alarm to inform a worker to check the equipment.
Further, when the central control module judges that the load of the direct drive motor is overlarge,
if I' is less than or equal to I0, the central control module judges that the rotating speed of the adjusted direct drive motor meets the requirement and does not further adjust the rotating speed of the direct drive motor;
if I' is larger than I0, the central control module judges that the direct drive motor has overlarge load, and the central control module further reduces the rotating speed of the direct drive motor by using a motor rotating speed regulating coefficient n0 and gives an alarm of overlarge load to inform workers to check the conditions in the mine.
Further, the central control module is provided with an oil supply rotation speed adjusting coefficient alpha and an oil supply time T0, when the central control module transmits an oil supply instruction to the oil supply device, the oil supply device supplies oil to the bearings in the bearing box, at the moment, the central control module increases the rotation speed of the direct drive motor by applying the oil supply rotation speed adjusting coefficient alpha and adjusts the rotation speed of the direct drive motor to the rotation speed before oil supply after the direct drive motor operates for a time period of T0 after the rotation speed is increased.
Further, when the direct-drive motor finishes working, the central control module slowly releases the reversal torque accumulated in the direct-drive motor, and the manner of releasing the reversal torque comprises using a square clip assembly, using the direct-drive motor spindle in the electric energy consumption brake bearing box and performing reversal braking on the direct-drive motor spindle through electromagnetic traction.
Further, a polished rod is arranged in the driving device, the polished rod penetrates through a hollow shaft hole of a rotor of the direct drive motor, the polished rod is connected with a main shaft of the direct drive motor at the upper end of the direct drive motor through a locking device in the square clamping assembly, and when the direct drive motor is started by the variable frequency control cabinet, the direct drive motor transmits working torque to the sucker rod through a locking mechanism so that the sucker rod drives the underground screw pump to work.
Compared with the prior art, the invention has the advantages that the operation condition of the driving device is judged by detecting the sound frequency and the current magnitude in the operation process of the driving device, if the driving device generates an abnormal condition, the central control module judges the reason of the condition and makes corresponding adjustment, the safety in the operation process of the device is ensured, and the operation efficiency and the stability of the device are further improved.
Furthermore, the driving device is provided with the first preset sound frequency f1, the internal condition of the driving device is preliminarily judged by comparing the detected sound frequency f with the first preset sound frequency f1, the hidden danger existing in the operation process of the driving device can be quickly preliminarily judged, the detection speed of the driving device is ensured, the working stability of the driving device is ensured, the safety of the driving device is further improved, and the operation efficiency and the stability of the driving device are further improved.
Furthermore, the invention is provided with a second preset sound frequency f2, a third preset sound frequency f3 and a motor rotating speed adjusting coefficient n0, the invention compares the sound frequency f' of the direct drive motor adjusted by the n0 with the second preset sound frequency f2 and the third preset sound frequency f3, further judges the operation condition of the driving device according to the comparison result and processes the operation condition, ensures the working stability of the device, and further improves the operation efficiency and the stability of the driving device while further improving the safety of the driving device.
Furthermore, the preset oil supply amount L0 is set, after the oil supply is carried out on the bearing in the bearing box by the oil supply device L0, the sound frequency f' emitted by the driving device after the oil supply is finished is compared with the first preset sound frequency f1, and the reason of the abnormal condition is further judged according to the comparison result, so that the working stability of the device is ensured, the safety of the device is further improved, and the operating efficiency and the stability of the driving device are further improved.
Furthermore, the motor rated current I0 is set, the current I' of the direct drive motor when the rotating speed is not adjusted, which is transmitted by the ammeter, is compared with the motor rated current I0, whether the rotating speed of the direct drive motor needs to be further adjusted is judged according to a comparison result, the state of the direct drive motor in the operation process of the driving device can be accurately judged, the working stability of the device is ensured, and the working efficiency of the device is further improved while the safety of the driving device is further improved.
Furthermore, the preset current difference value delta I0 is set, the problems of the direct drive motor are further judged and correspondingly solved by comparing the relation between delta I and delta I0, the working stability of the device is ensured, and the working efficiency of the device is further improved while the safety of the device is further improved.
Furthermore, the motor current I' after the rotating speed is adjusted is compared with the preset current I0, and whether the rotating speed of the direct drive motor needs to be further adjusted or not is further judged according to the comparison result, so that the working stability of the device is ensured, the safety of the device is further improved, and the working efficiency of the device is further ensured.
Furthermore, the oil supply rotating speed regulating coefficient alpha and the oil supply time T0 are set in the oil supply device, when the oil supply device supplies oil to the bearing in the bearing box, the central control module applies the oil supply rotating speed regulating coefficient alpha to improve the rotating speed of the direct drive motor for lasting T0 time by regulating the potentiometer so as to accelerate the lubricating time, the working stability of the device is ensured, the safety of the device is further improved, and the working efficiency of the device is further ensured.
Further, when the work of the direct-drive motor is finished, the central control module slowly releases the reversal torque accumulated in the direct-drive motor through the square clamp assembly and the bearing box by adopting electric energy consumption braking and electromagnetic traction reversal braking, so that the working stability of the device is ensured, the safety of the device is further improved, and the working efficiency of the device is further ensured.
Furthermore, the polished rod of the screw pump is connected with the rotor hollow shaft of the direct drive motor, so that the synchronous operation of the screw pump and the direct drive motor is ensured, and the stability and the working efficiency of the device are further ensured.
Drawings
Fig. 1 is a schematic structural view of a driving device of a screw pump according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described in conjunction with the following examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of a driving device of a screw pump according to the present invention. The driving device of the screw pump of the present invention comprises:
the direct drive motor 3 comprises a stator and a rotor with a hollow shaft structure and is used for driving the screw pump to operate;
the square clamp assembly 2 is positioned above the direct drive motor 3 and connected with the direct drive motor 3 through bolts, and is used for releasing excessive torque generated in the working process of the direct drive motor 3;
the square clamp shield 1 is used for isolating the square clamp assembly 2 from the external environment;
the bearing box 4 is a box part and is used for supporting the direct drive motor 3 and lubricating the bearings, a plurality of bearings and oil feeding devices are arranged in the bearing box 4, and the oil feeding devices are used for providing lubricating oil for the bearings in the bearing box 4;
a mechanical sealing device 5 for preventing air from leaking into the driving device;
the detection device (not shown in the figure) comprises an acoustic frequency tester and an ammeter, and is used for detecting relevant parameters of the driving device in the operation process;
the bracket 6 is used for supporting the screw pump driving device;
the variable frequency control cabinet (not shown in the figure) comprises a central control module and a control panel, and is used for starting and stopping the driving device to monitor the operation parameters of the driving device and regulate the driving device; when the driving device runs, the central control module controls the sound frequency tester to detect the sound frequency in the driving device and compares the sound frequency with a preset sound frequency so as to preliminarily judge whether an abnormal condition exists in the driving device, if the central control module judges that the abnormal condition exists in the driving device, the central control module reduces the rotating speed of the direct drive motor 3 through a potentiometer and detects the sound frequency in the driving device after the rotating speed is reduced so as to further judge the reason of the abnormal condition of the driving device and carry out corresponding processing aiming at different reasons, and when the driving device generates the abnormal condition, the central control module detects the current of the direct drive motor 3 so as to judge whether the direct drive motor 3 is overloaded or not or whether the output shaft of the direct drive motor 3 is overloaded or not so as to judge whether the rotational speed of the direct drive motor 3 is adjusted.
In the working engineering of the driving device, the rotor of the direct drive motor 3 rotates at a high speed, the rotor of the direct drive motor 3 transmits the rotating speed and the torque of the rotor of the direct drive motor 3 to the polished rod through the locking mechanism in the square clamping assembly 2, the polished rod drives the screw pump to rotate to carry out underground operation, in the process, the mechanical sealing device 5 is used for isolating air, and the central control module controls the sound frequency tester and the galvanometer to monitor the running state of the driving device in real time and process the running state.
The invention judges the operation condition of the driving device by detecting the sound frequency and the current magnitude in the operation process of the driving device, if the driving device generates abnormal conditions, the central control module judges the reason of the conditions and makes corresponding adjustment, thereby ensuring the safety in the operation process of the device and further improving the operation efficiency and the stability of the device.
Specifically, the sound wave spectrum tester detects the frequency f of sound generated by the driving device in real time and transmits the detected sound frequency f to the central control module, and the central control module judges the running condition of the driving device according to the detected sound frequency f;
the central control module is provided with a first preset sound frequency f1, compares the detected sound frequency f with the first preset sound frequency f1 and judges the running condition of the driving device according to the comparison result;
if f is less than or equal to f1, the central control module judges that the driving device normally operates without abnormal conditions;
if f is larger than f1, the central control module preliminarily judges that an abnormal condition occurs in the running process of the driving device and further judges the reason of the abnormal condition.
The driving device is provided with the first preset sound frequency f1, the internal condition of the driving device is preliminarily judged by comparing the detected sound frequency f with the first preset sound frequency f1, the preliminary judgment on hidden dangers existing in the operation process of the driving device can be quickly made, the detection speed of the driving device is ensured, the working stability of the driving device is ensured, the safety of the driving device is further improved, and the operation efficiency and the stability of the driving device are further improved.
Specifically, the central control module is provided with a second preset sound frequency f2, a third preset sound frequency f3 and a motor rotating speed adjusting coefficient n0, wherein f2 is less than f3, when the central control module preliminarily determines that the driving device has an abnormal condition in the operation process, the central control module reduces the rotating speed of the direct drive motor 3 to a corresponding value by using the motor rotating speed adjusting coefficient n0, controls the sound wave frequency spectrum tester to detect the sound frequency f 'generated in the operation of the direct drive motor 3 after the rotating speed is reduced again, and further determines the operation condition of the driving device according to the section where f' is located;
if f' is less than or equal to f2, the central control module judges that the reason of generating the abnormal condition is that the rotating speed of the direct drive motor 3 is too high, and the central control module further judges whether the rotating speed of the direct drive motor 3 needs to be further adjusted according to the current of the direct drive motor 3 in the running process;
if f2 is greater than f' and less than or equal to f3, the central control module judges that the reason of the abnormal condition is bearing lubricating oil loss in the bearing box 4, controls the oil supply device to supply oil to the bearing with the lubricating oil loss, and judges the operation condition of the driving device again after the oil supply;
if f' is more than f3, the central control module judges that the reason of the abnormal condition is that the direct drive motor 3 is damaged, and the central control module controls the direct drive motor 3 to stop running and sends out a damage warning of the direct drive motor 3 so as to inform a worker to check and maintain the direct drive motor 3.
The invention is provided with a second preset sound frequency f2, a third preset sound frequency f3 and a motor rotating speed adjusting coefficient n0, the sound frequency f' of the direct drive motor 3 adjusted by the n0 is compared with the second preset sound frequency f2 and the third preset sound frequency f3, the operation condition of the driving device is further judged and processed according to the comparison result, the working stability of the device is ensured, and the operation efficiency and the stability of the driving device are further improved while the safety of the driving device is further improved.
Specifically, the oil feeding device is provided with a preset oil feeding amount L0, when the central control module judges that the bearing lubricating oil in the bearing box 4 is deficient, the central control module controls the oil feeding device to supply oil to the bearing in the bearing box 4 and sets the oil feeding amount to be L0, and after the oil feeding of the oil feeding device is completed, the central control module controls the sound frequency f' emitted by the driving device after the oil feeding is completed to be detected by the sound wave spectrum tester so as to further judge the operation condition of the driving device;
if f is less than or equal to f1, the central control module judges that the reason of generating the abnormal condition is loss of bearing lubricating oil in the bearing box 4 and judges that the abnormal condition is solved;
if f is greater than f1, the central control module judges that the reason of the abnormal condition is that the direct drive motor 3 is damaged and sends out a direct drive motor 3 damage alarm to inform a worker to check and repair.
The invention is provided with the preset oil supply amount L0, and after the invention applies L0 to supply oil to the bearing in the bearing box 4, the invention compares the sound frequency f' emitted by the driving device after the oil supply is finished with the first preset sound frequency f1 and further judges the reason of the abnormal condition according to the comparison result, thereby ensuring the working stability of the device, further improving the safety of the device and simultaneously further improving the operating efficiency and the stability of the driving device.
Specifically, the central control module is further provided with a motor rated current I0, the ammeter is used for detecting and recording the current I flowing through the stator and the rotor of the direct drive motor 3 in real time and transmitting the current I to the central control module, and when the central control module determines that the reason of generating the abnormal condition is that the rotating speed of the direct drive motor 3 is too high, the central control module compares the current I' of the direct drive motor 3, which is transmitted by the ammeter and is not regulated in rotating speed, with the motor rated current I0 and determines whether the rotating speed of the direct drive motor 3 needs to be further regulated or not according to the comparison;
if I ' > I0, the central control module judges that the direct drive motor 3 is overloaded or the output shaft of the direct drive motor 3 is overloaded before the rotating speed of the direct drive motor 3 is adjusted, the central control module calculates a difference value delta I between I ' and I0, further judges the problems of the direct drive motor 3 according to the delta I, and sets delta I = I ' -I0;
and if I' is less than or equal to I0, the central control module judges that the direct drive motor 3 normally operates.
The device is provided with the motor rated current I0, the current I' of the direct drive motor 3 when the rotating speed is not regulated and transmitted by the ammeter is compared with the motor rated current I0, whether the rotating speed of the direct drive motor 3 needs to be further regulated or not is judged according to a comparison result, the state of the direct drive motor 3 in the running process of the driving device can be accurately judged, the working stability of the device is ensured, the safety of the driving device is further improved, and the working efficiency of the device is further improved.
Specifically, the central control module is provided with a preset current difference value delta I0, when I' is greater than I0, the central control module compares the delta I with the delta I0 and further judges the problems of the direct drive motor 3 according to the comparison result;
if the delta I is less than or equal to the delta I0, the central control module preliminarily judges that the direct drive motor 3 is overloaded, and the central control module further judges whether the rotating speed of the direct drive motor 3 needs to be further adjusted according to the motor current I' after the rotating speed is adjusted and the preset current I0;
if delta I is larger than delta I0, the central control module judges that the direct drive motor 3 is overloaded, and the central control module sends out a motor overload alarm to inform a worker of checking the equipment.
The direct-drive motor 3 is provided with the preset current difference value delta I0, the problems of the direct-drive motor 3 are further judged and correspondingly solved by comparing the relation between the delta I and the delta I0, the working stability of the device is ensured, and the working efficiency of the device is further improved while the safety of the device is further improved.
Specifically, when the central control module determines that the direct drive motor 3 is overloaded,
if I' is less than or equal to I0, the central control module judges that the rotating speed of the adjusted direct drive motor 3 meets the requirement and does not further adjust the rotating speed of the direct drive motor 3;
if I' is greater than I0, the central control module judges that the direct drive motor 3 has an overlarge load, and the central control module further reduces the rotating speed of the direct drive motor 3 by using a motor rotating speed regulating coefficient n0 and gives an overlarge load alarm to inform workers to check the conditions in the mine.
According to the invention, the motor current I' after the rotating speed is regulated is compared with the preset current I0, and whether the rotating speed of the direct drive motor 3 needs to be further regulated or not is further judged according to the comparison result, so that the working stability of the device is ensured, and the working efficiency of the device is further ensured while the safety of the device is further improved.
Specifically, the central control module is provided with an oil supply rotation speed adjustment coefficient α and an oil supply time T0, when the central control module transmits an oil supply instruction to the oil supply device, the oil supply device supplies oil to the bearing in the bearing box 4, and at this time, the central control module increases the rotation speed of the direct drive motor 3 by using the oil supply rotation speed adjustment coefficient α and adjusts the rotation speed of the direct drive motor 3 to the rotation speed before oil supply after the direct drive motor 3 operates for a time period of T0 after the increased rotation speed is used.
The oil supply control device is provided with an oil supply rotating speed adjusting coefficient alpha and oil supply time T0, when the oil supply device supplies oil to the bearing in the bearing box 4, the central control module applies the oil supply rotating speed adjusting coefficient alpha to improve the rotating speed of the direct drive motor 3 for the time of lasting T0 by adjusting the potentiometer so as to accelerate the lubrication time, the working stability of the device is ensured, the safety of the device is further improved, and meanwhile, the working efficiency of the device is further ensured.
Specifically, when the direct drive motor 3 finishes working, the central control module slowly releases the reversal torque accumulated in the direct drive motor 3, and the manner of releasing the reversal torque comprises using the square clip assembly 2, using the main shaft of the direct drive motor 3 in the electric energy consumption brake bearing box 4 and performing reversal braking on the main shaft of the direct drive motor 3 by electromagnetic traction.
When the work of the invention is finished, the central control module adopts electric energy consumption braking and electromagnetic traction reverse braking to slowly release the reverse torque accumulated in the direct drive motor 3 through the square clamping assembly 2 and the bearing box 4, thereby ensuring the working stability of the device, further improving the safety of the device and simultaneously further ensuring the working efficiency of the device.
Specifically, a polished rod is arranged in the driving device, the polished rod penetrates through a hollow shaft hole of a rotor of the direct drive motor 3, the polished rod is arranged at the upper end of the direct drive motor 3 and is connected with a main shaft of the direct drive motor 3 through a locking device in the square clamp assembly 2, and when the direct drive motor 3 is started by the variable frequency control cabinet, the direct drive motor 3 transmits working torque to the sucker rod through a locking mechanism so that the sucker rod drives the underground screw pump to work.
According to the invention, the polished rod of the screw pump is connected with the rotor hollow shaft of the direct drive motor 3, so that the synchronous operation of the screw pump and the direct drive motor 3 is ensured, and meanwhile, the stability and the working efficiency of the device are further ensured.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A drive device of a screw pump, comprising:
the direct drive motor comprises a stator and a rotor with a hollow shaft structure and is used for driving the screw pump to operate;
the square clamping sub-assembly is positioned above the direct drive motor and connected with the direct drive motor through a bolt, and is used for releasing excessive torque generated in the working process of the direct drive motor;
a square card shield isolating the square card assembly from an external environment;
the bearing box is a box body part and is used for supporting the direct drive motor and lubricating the bearings, a plurality of bearings and oil feeding devices are arranged in the bearing box, and the oil feeding devices are used for providing lubricating oil for the bearings in the bearing box;
a mechanical seal device for preventing air from leaking into the driving device;
the detection device comprises an acoustic frequency tester and an ammeter and is used for detecting relevant parameters of the driving device in the operation process;
the bracket is used for supporting the screw pump driving device;
the variable frequency control cabinet comprises a central control module and a control panel, and is used for starting and stopping the driving device to monitor the operation parameters of the driving device and adjust the driving device; the central control module controls the sound frequency tester to detect the sound frequency in the driving device when the driving device runs and compares the sound frequency with the preset sound frequency so as to preliminarily judge whether an abnormal condition exists in the driving device, if the central control module judges that the abnormal condition exists in the driving device, the central control module reduces the rotating speed of the direct drive motor through a potentiometer and detects the sound frequency in the driving device after the rotating speed is reduced so as to further judge the reason of the abnormal condition of the driving device and carry out corresponding treatment aiming at different reasons, and when the driving device generates the abnormal condition, the central control module detects the current of the direct drive motor so as to judge whether the direct drive motor is overloaded or not or whether the output shaft of the direct drive motor is overloaded or not so as to judge whether the rotating speed treatment is carried out on the direct drive motor or not.
2. The driving device of a screw pump according to claim 1, wherein the sound wave spectrum tester detects the frequency f of sound generated by the driving device during operation in real time and transmits the detected sound frequency f to the central control module, and the central control module determines the operation condition of the driving device according to the detected sound frequency f;
the central control module is provided with a first preset sound frequency f1, compares the detected sound frequency f with the first preset sound frequency f1 and judges the running condition of the driving device according to the comparison result;
if f is less than or equal to f1, the central control module judges that the driving device normally operates without abnormal conditions;
if f is larger than f1, the central control module preliminarily judges that an abnormal condition occurs in the running process of the driving device and further judges the reason of the abnormal condition.
3. The driving device of the screw pump according to claim 2, wherein the central control module is provided with a second preset sound frequency f2, a third preset sound frequency f3 and a motor rotation speed adjusting coefficient n0, wherein f2 is less than f3, when the central control module preliminarily determines that the driving device has an abnormal condition in the operation process, the central control module reduces the rotation speed of the direct drive motor to a corresponding value by using the motor rotation speed adjusting coefficient n0, controls the sound wave frequency spectrum tester to detect the sound frequency f 'generated in the operation of the direct drive motor after the rotation speed is reduced again, and further determines the operation condition of the driving device according to the section where f' is located;
if f' is less than or equal to f2, the central control module judges that the reason of generating the abnormal condition is that the rotating speed of the direct drive motor is overhigh, and the central control module further judges whether the rotating speed of the direct drive motor needs to be further adjusted according to the current of the direct drive motor in the running process;
if f2 is more than f' and less than or equal to f3, the central control module judges that the reason of the abnormal condition is loss of lubricating oil of a bearing in the bearing box, controls the oil supply device to supply oil to the bearing with the loss of the lubricating oil, and judges the operation condition of the driving device again after the oil supply;
if f' is greater than f3, the central control module judges that the reason of the abnormal condition is the damage of the direct drive motor, and the central control module controls the direct drive motor to stop running and sends a direct drive motor damage warning to inform workers to check and maintain the direct drive motor.
4. The driving device of a screw pump according to claim 3, wherein the oil feeding device is provided with a preset oil feeding amount L0, when the central control module determines that the bearing lubricating oil in the bearing box is deficient, the central control module controls the oil feeding device to supply oil to the bearing in the bearing box and sets the oil feeding amount to L0, and after the oil feeding of the oil feeding device is completed, the central control module controls the acoustic spectrum tester to detect the acoustic frequency f ″ emitted by the driving device after the oil feeding is completed so as to further determine the operation condition of the driving device;
if f is less than or equal to f1, the central control module judges that the reason of generating the abnormal condition is loss of bearing lubricating oil in the bearing box and judges that the abnormal condition is solved;
if f is greater than f1, the central control module judges that the reason of the abnormal condition is that the direct drive motor is damaged and sends out a direct drive motor damage alarm to inform a worker to check and repair.
5. The driving device of a screw pump according to claim 3, wherein the central control module is further provided with a motor rated current I0, the galvanometer is used for detecting and recording the current I flowing through the stator and the rotor of the direct drive motor in real time and transmitting the current I to the central control module, and when the central control module determines that the reason of the abnormal condition is that the rotating speed of the direct drive motor is too high, the central control module compares the current I' of the direct drive motor, which is transmitted by the galvanometer and is not adjusted in rotating speed, with the motor rated current I0 and determines whether the rotating speed of the direct drive motor needs to be further adjusted according to the comparison;
if I ' > I0, the central control module judges that the direct drive motor is overloaded or the output shaft of the direct drive motor is overloaded before the rotating speed of the direct drive motor is adjusted, the central control module calculates a difference value delta I between I ' and I0, further judges the problems of the direct drive motor according to the delta I, and sets delta I = I ' -I0;
and if I' is less than or equal to I0, the central control module judges that the direct drive motor normally operates.
6. The driving device of a screw pump according to claim 5, wherein the central control module is provided with a preset current difference Δ I0, and when I' > I0, the central control module compares Δ I with Δ I0 and further determines the problems of the direct drive motor according to the comparison result;
if the delta I is less than or equal to the delta I0, the central control module preliminarily judges that the direct drive motor is overloaded, and further judges whether the rotating speed of the direct drive motor needs to be further adjusted or not according to the motor current I' after the rotating speed is adjusted and the preset current I0;
if delta I is larger than delta I0, the central control module judges that the direct drive motor is overloaded, and the central control module sends out a motor overload alarm to inform a worker to check the equipment.
7. A drive arrangement for a screw pump according to claim 6, wherein, when the central control module determines that the direct drive motor is overloaded,
if I' is less than or equal to I0, the central control module judges that the rotating speed of the adjusted direct drive motor meets the requirement and does not further adjust the rotating speed of the direct drive motor;
if I' is larger than I0, the central control module judges that the direct drive motor has overlarge load, and the central control module further reduces the rotating speed of the direct drive motor by using a motor rotating speed regulating coefficient n0 and gives an alarm of overlarge load to inform workers to check the conditions in the mine.
8. The driving device of a screw pump according to claim 4, wherein the central control module is provided with an oil supply rotation speed adjustment coefficient α and an oil supply time T0, and when the central control module transmits an oil supply instruction to the oil supply device, the oil supply device supplies oil to the bearings in the bearing housing, at this time, the central control module increases the rotation speed of the direct drive motor by using the oil supply rotation speed adjustment coefficient α and adjusts the rotation speed of the direct drive motor to the rotation speed before oil supply after the direct drive motor operates for a time period of T0 after the direct drive motor is increased in use.
9. The drive arrangement of a screw pump according to claim 1, wherein when the operation of the direct drive motor is completed, the central control module slowly releases the counter-rotation torque accumulated in the direct drive motor in a manner that includes using a square clip assembly, using the main shaft of the direct drive motor in an electrical energy consumption braking bearing housing, and electromagnetically braking the main shaft of the direct drive motor in a counter-rotation manner.
10. The driving device of the screw pump according to claim 1, wherein a polish rod is arranged in the driving device, the polish rod penetrates through a hollow shaft hole of a rotor of the direct drive motor, the polish rod is connected with a main shaft of the direct drive motor at the upper end of the direct drive motor through a locking device in the square clamping assembly, and when the direct drive motor is started by the variable frequency control cabinet, the direct drive motor transmits working torque to the sucker rod through a locking mechanism so that the sucker rod drives the underground screw pump to work.
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| JPS61234332A (en) * | 1985-04-10 | 1986-10-18 | Nissan Motor Co Ltd | Abnormal sound discriminator for engine |
| JPH08278191A (en) * | 1995-04-06 | 1996-10-22 | Nissan Motor Co Ltd | Abnormal state judging method of machine operating noise |
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| CN115962125B (en) | 2023-06-16 |
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