CN113107840A - Screw pump vibration control structure and method - Google Patents

Screw pump vibration control structure and method Download PDF

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Publication number
CN113107840A
CN113107840A CN202110383177.4A CN202110383177A CN113107840A CN 113107840 A CN113107840 A CN 113107840A CN 202110383177 A CN202110383177 A CN 202110383177A CN 113107840 A CN113107840 A CN 113107840A
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China
Prior art keywords
vibration
screw
screw pump
mass
sensor
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CN202110383177.4A
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CN113107840B (en
Inventor
幸文婷
王兆文
罗聪
朱赤
兰秋华
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/46—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring amplitude of generated current or voltage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Rotary Pumps (AREA)

Abstract

The invention provides a screw pump vibration control structure and a screw pump vibration control method. Wherein, this screw pump vibration control structure includes: the vibration monitoring device comprises a machine body, a vibration sensor and a control unit, wherein the machine body is provided with the vibration sensor which is used for monitoring the vibration of the machine body; the screw rod penetrates through the machine body, a rotating speed sensor is further arranged on the machine body, and the rotating speed sensor is used for monitoring the rotating speed of the screw rod; the mass balancing device is arranged at the vacant end of the screw rod and used for adjusting the mass of the balance weight; and the acquisition and analysis system is in communication connection with the vibration sensor and the rotating speed sensor. The screw pump vibration control structure provided by the invention can know whether the screw pump generates resonance or not after being analyzed by the acquisition and analysis system, and can eliminate the resonance by adjusting the mass balance device at the idle end of the screw rod so as to enable the screw pump to achieve a good running state and adjust the self design of the screw rod to adapt to the system, thereby being more convenient.

Description

Screw pump vibration control structure and method
Technical Field
The invention relates to the technical field of screw pumps, in particular to a screw pump vibration control structure and a screw pump vibration control method.
Background
The screw pump is a pump which makes water body spirally ascend along the axial direction by utilizing the rotation of a spiral blade. When the driving screw rotates, the driving screw drives the driven screw meshed with the driving screw to rotate together, the volume of a screw meshing space at one end of the suction cavity is gradually increased, the pressure is reduced, and functions of conveying or driving and the like are further realized. The three-screw pump has the characteristic that the flow is not affected by the outlet pressure basically, and is commonly used as a lubricating oil system driving pump with stable flow demand in a ship power device.
In the prior art, the types of a mounting base and a vibration isolator are generally determined according to the rotating speed, the mass and the mounting type of a three-screw pump so as to control the vibration of a pump body, and the association between the screw pump and the operating environment of a system is basically not considered. The same type of three-screw pump is applied to different power systems, and the three-screw pump may generate resonance due to mismatching with the system modal characteristics.
When the operating environment or design parameters of the system change to cause the screw pumps to resonate, the existing three-screw pump can not adapt to the system basically by adjusting the design of the three-screw pump, and the system where the three-screw pump is located needs to be greatly changed to change the modal characteristics of the system or change the vibration isolation type of the three-screw pump.
Disclosure of Invention
The invention provides a screw pump vibration control structure and method, which are used for overcoming the defect that a three-screw pump in the prior art can not adapt to a system by adjusting the self design, and achieving the purpose of eliminating the resonance of the three-screw pump.
The invention provides a screw pump vibration control structure, comprising:
the vibration monitoring device comprises a machine body, a vibration sensor and a control unit, wherein the machine body is provided with the vibration sensor which is used for monitoring the vibration of the machine body;
the screw rod penetrates through the machine body, the screw rod is provided with a vacant end extending out of the machine body, and the machine body is also provided with a rotating speed sensor which is used for monitoring the rotating speed of the screw rod;
the mass balancing device is arranged at the vacant end of the screw rod and used for adjusting the mass of the balance weight;
and the acquisition and analysis system is in communication connection with the vibration sensor and the rotating speed sensor.
According to the screw pump vibration control structure provided by the invention, the mass balancing device comprises a mounting disc and a plurality of counterweight blocks, the center of the mounting disc is fixedly connected with the screw, the mounting disc is provided with a first surface which is far away from the machine body, the first surface of the mounting disc is provided with a plurality of mounting positions which are arranged at intervals, and the counterweight blocks are detachably connected with the mounting positions.
According to the screw pump vibration control structure provided by the invention, the balancing weight is in magnetic attraction connection with the mounting position.
According to the screw pump vibration control structure provided by the invention, the machine body comprises a machine shell and an end cover, the end cover is fixed at one end of the machine shell, the vibration sensor is arranged on the machine shell, the rotating speed sensor is arranged on the end cover, and the mass balance device is arranged opposite to the end cover.
According to the screw pump vibration control structure provided by the invention, the second surface of the mounting plate is provided with the detection block, and the rotation path of the detection block passes between the transmitting and receiving ends of the rotation speed sensor.
According to the screw pump vibration control structure provided by the invention, the number of the screws is three, the three screws are sequentially meshed, the number of the mass balancing devices is three, and the three mass balancing devices and the three screws are in one-to-one correspondence and are connected.
The invention also provides a method of vibration control of a screw pump, comprising a screw pump vibration control structure according to any one of claims 1 to 6; the method comprises the following steps:
obtaining vibration information of the machine body according to the monitoring of the vibration sensor;
monitoring according to the rotation speed sensor to obtain rotation speed information of the screw;
transmitting the vibration information and the rotating speed information to the acquisition and analysis system;
the acquisition and analysis system analyzes the vibration information and the rotating speed information to obtain an analysis result;
and adjusting the mass balance device according to the analysis result to eliminate resonance.
According to the screw pump vibration control method provided by the invention, the step of analyzing the vibration information and the rotating speed information by the acquisition and analysis system to obtain an analysis result comprises the following steps:
obtaining the vibration frequency f of the body according to the vibration information1；
Obtaining the screw rotation frequency f according to the rotation speed information2；
When f is2≠f1Then, the analysis result is in a non-resonance state;
when f is2＝f1Then, the analysis result is a resonance state.
According to the screw pump vibration control method provided by the invention, the step of adjusting the mass balance device according to the analysis result and eliminating resonance comprises the following steps:
when the analysis result is in a non-resonance state, the mass balance device does not need to be adjusted;
and when the analysis result is in a resonance state, adjusting the counterweight mass of the mass balance device until the analysis result is in a non-resonance state.
According to the vibration control method of the screw pump, the number of the screws is three, the three screws are meshed in sequence, and the rotating speed of each screw is monitored by at least one rotating speed sensor.
The invention provides a screw pump vibration control structure and a method, wherein a collection analysis system is used for receiving vibration measured by a vibration sensor and rotating speed measured by a rotating speed sensor, whether the screw pump resonates or not can be obtained after analysis, when the screw pump resonates, mass adjustment is carried out by a mass balancing device at the idle end of an adjusting screw rod, and the resonance is eliminated, so that the screw rod reaches a good running state.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a vibration control structure of a screw pump according to the present invention;
FIG. 2 is a schematic view of the mass balance arrangement of the vibration control structure of the screw pump according to the present invention;
FIG. 3 is a schematic structural view of an end cap of a screw pump vibration control arrangement provided by the present invention;
FIG. 4 is a schematic structural diagram of an acquisition and analysis system of a screw pump vibration control structure provided by the present invention;
FIG. 5 is a schematic flow diagram of a method of vibration control for a progressive cavity pump according to the present invention;
reference numerals:
10: a body; 11: a housing; 111: a vibration sensor;
12: an end cap; 121: a rotational speed sensor; 20: a screw;
30: mounting a disc; 31: a balancing weight; 40: and (4) collecting and analyzing the system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The structure and method of vibration control of the screw 20 pump of the present invention will be described with reference to fig. 1-5.
Referring to fig. 1 to 4, the vibration control structure of the screw 20 pump includes:
the vibration monitoring device comprises a machine body 10, wherein a vibration sensor 111 is arranged on the machine body 10, and the vibration sensor 111 is used for monitoring the vibration of the machine body 10;
the screw 20 is arranged in the machine body 10 in a penetrating manner, the machine body 10 is further provided with a rotating speed sensor 121, and the rotating speed sensor 121 is used for monitoring the rotating speed of the screw 20;
the mass balancing device is arranged at the idle end of the screw rod 20 and is used for adjusting the mass of the balance weight;
and the acquisition and analysis system 40 is in communication connection with the vibration sensor 111 and the rotating speed sensor 121 through the acquisition and analysis system 40.
One end of the screw 20 is supported by a bearing disposed in the machine body 10 to rotate in the machine body 10, and the other end is a free end. The vibration sensor 111 may be a vibration acceleration sensor, a vibration speed sensor, a vibration displacement sensor, a strain gauge, or the like, and the monitored vibration of the body 10 may be a vibration acceleration, a vibration speed, a vibration displacement, or the like; the rotational speed sensor 121 monitors the rotational speed of the screw 20 during its movement. When the rotational frequency of the screw 20 is identical to the vibration frequency of the body 10, resonance occurs, and the phase of the maximum unbalanced mass point of the screw 20 is about 90 ° different from the phase of the maximum vibration point of the body 10, which easily causes pump damage to the screw 20, and when the rotational frequency of the screw 20 is not identical to the vibration frequency of the body 10, the phase of the maximum unbalanced mass point of the screw 20 is substantially identical to the phase of the maximum vibration point of the body 10, and resonance is eliminated.
In addition, the mass balance device is used for adjusting the configuration mass and further eliminating resonance, the acquisition and analysis system 40 is used for monitoring and analyzing whether the screw 20 pump has a resonance state, and the communication connection mode between the acquisition and analysis system and the vibration sensor 111 and the rotation speed sensor 121 can be wired or wireless transmission modes such as wifi and 4G.
In this embodiment, the acquisition and analysis system 40 receives the vibration measured by the vibration sensor 111 and the rotation speed measured by the rotation speed sensor 121, and then it is analyzed to determine whether the screw 20 pump resonates, and when the resonance occurs, the mass balance device at the idle end of the screw 20 is adjusted to adjust the mass and eliminate the resonance, so that the screw 20 reaches a good operation state.
The screw 20 pump provided in this embodiment is a three-screw 20 pump, and of course, the screw 20 pump may also be a twin-screw 20 pump or a single-screw 20 pump as needed, which is not described in detail.
Referring to fig. 2, in an embodiment of the present invention, the mass balancing device includes a mounting plate 30 and a plurality of weight blocks, a center of the mounting plate 30 is fixedly connected to the screw 20, the mounting plate 30 has a first surface facing away from the machine body 10, the first surface of the mounting plate 30 has a plurality of mounting locations arranged at intervals, and the weight block 31 is detachably connected to the mounting locations.
The specific structural form of the mass balance device in one embodiment is given here, the mounting disc 30 is cylindrical, and the center of the mounting disc 30 is fixedly connected with the screw rod 20, so as to ensure stable rotation of the screw rod 20. By installing the weight 31 or removing the weight 31 at the installation site of the first surface of the installation plate 30, resonance can be eliminated as required. In other embodiments, the adjustment of the counterweight may be accomplished by removing a different mounting plate 30.
The structure for detachably connecting the counterweight 31 and the installation position is received, and the counterweight 31 is magnetically connected with the installation position.
Connect through magnetism and to realize the quick assembly disassembly of balancing weight 31, in addition, a plurality of installation positions encircle the even interval arrangement in center of mounting disc 30, when adjusting the configuration, can guarantee quality balance device's balance as required.
In this embodiment, the first surface of the mounting plate 30 is planar, and further, in order to stably mount the weight block 31, a recess adapted to the weight block 31 is recessed at the mounting position of the first surface of the mounting plate, so as to more fit the weight block 31, and ensure that the weight block 31 is mounted at the corresponding position.
In other embodiments, the mounting position of the mounting block has a screw hole, the weight block 31 has a screw head, and the weight block 31 is assembled and disassembled by connecting the screw head of the weight block 31 with the screw hole through a screw thread.
Referring to fig. 1 and fig. 3, in an embodiment of the present invention, the machine body 10 includes a casing 11 and an end cover 12, the end cover 12 is fixed to one end of the casing 11, the vibration sensor 111 is disposed on the casing 11, the rotation speed sensor 121 is disposed on the end cover 12, and the mass balance device is disposed opposite to the end cover 12.
The vibration sensor 111 is disposed on the casing 11, so as to measure the vibration of the machine body 10 and transmit the vibration to the collection and analysis system 40 conveniently, and the vibration sensor is disposed on the end cover 12, so as to measure the rotation speed of the screw 20 and transmit the rotation speed to the collection and analysis system 40 conveniently. The vibration sensor 111 may be provided at any position of the body 10 as needed as long as stable monitoring is achieved.
Specifically, in one embodiment, the second surface of the mounting plate 30 has a sensing block, the rotation path of which passes between the transceiving ends of the rotation speed sensor 121.
The rotation speed sensor 121 provided herein has a light source transmitting end and a receiving end, and when the monitoring block passes between the transmitting and receiving ends, the rotation speed sensor 121 can output a pulse signal related to the rotation frequency, so as to achieve the purpose of measuring the speed. In other embodiments, the outer periphery of the mounting plate 30 has gear teeth, the rotation speed sensor 121 is a variable reluctance type rotation speed sensor 121, and through the relative movement of the inner and outer gears, the magnetic resistance is changed, an alternating current induced potential is generated in the coil, and the corresponding rotation speed value can be measured by measuring the magnitude of the potential.
Referring to fig. 1, in an embodiment of the present invention, the screw 20 is disposed in the machine body 10, a free end of the screw 20 does not extend out of the end cover 12, the rotation speed sensor 121 is disposed on an inner wall of the end cover 12, the mass balancing device is disposed in the machine body 10, the end cover 12 can protect an internal structure, and when adjusting a counterweight mass of the mass balancing device, the end cover 12 needs to be detached first, and the counterweight 31 needs to be detached.
In another embodiment, the free end of the screw 20 extends out of the end cover 12, the rotation speed sensor 121 is disposed on the outer wall of the end cover 12, the mass balance device is located outside the machine body 10, and when the counterweight mass of the mass balance device is adjusted, the counterweight 31 can be directly disassembled without disassembling the end cover 12, so that the adjustment is convenient.
Referring to fig. 1 to 3, it should be noted that, in an embodiment of the present invention, the screw 20 pump is a three-screw 20 pump, the number of the screws 20 is three, the three screws 20 are sequentially engaged, and the mass balance device has three mass balance devices, and the three mass balance devices are connected to the three screws 20 in a one-to-one correspondence manner.
Thus, the resonance can be eliminated more conveniently as required by adjusting the balance weights of the three mass balancing devices. Generally, since the three screws 20 are meshed, when the rotation speed of the screw 20 is measured by the rotation speed sensor 121, the rotation speeds of the three screws 20 are the same, and when adjusting, only the counterweight of one mass balancing device can be adjusted, and the three mass balancing devices are arranged, so that the adjusting mode is more, and the adjusting amplitude is thinner. Also, in the aforementioned embodiment in which the outer circumference of the mounting plate 30 is provided with gear teeth, the three mounting plates 30 are sequentially engaged to further ensure stable rotation of the three screws 20.
Referring to fig. 5, in addition, the present invention further provides a method for controlling the vibration of the screw 20 pump, including the structure for controlling the vibration of the screw 20 pump; the method comprises the following steps:
obtaining vibration information of the body 10 according to the monitoring of the vibration sensor 111; the vibration sensor 111 is used for monitoring the vibration of the body 10 in real time and transmitting the monitored vibration information to the collecting and analyzing system 40 in time.
Monitoring according to the rotating speed sensor 121 to obtain rotating speed information of the screw 20; the rotation speed sensor 121 monitors the rotation speed of the screw 20 in real time, and transmits the monitored rotation speed information to the acquisition and analysis system 40 in time.
Transmitting the vibration information and the rotating speed information to the acquisition and analysis system 40;
the acquisition and analysis system 40 analyzes the vibration information and the rotating speed information to obtain an analysis result; through real-time information transmission and real-time analysis, whether the screw 20 pump is in a resonance state or not is further obtained, so that the screw 20 pump can be adjusted according to the result.
And adjusting the mass balance device according to the analysis result to eliminate resonance.
Through the steps of the method, the screw rod 20 pump can be adapted to a system through self design of the adjusting screw rod 20 pump, the operation is more convenient, and the damage or danger of the screw rod 20 pump is avoided.
Specifically, the step of analyzing the vibration information and the rotation speed information by the collecting and analyzing system 40 to obtain an analysis result includes:
obtaining the vibration frequency f of the body 10 according to the vibration information1；
Obtaining the rotation frequency f of the screw 20 according to the rotation speed information2；
When f is2≠f1When the signal is in the non-resonance state, the analysis result is in the non-resonance state;
when f is2＝f1When the measured value is zero, the analysis result is a resonance state.
Only when the vibration frequency of the body 10 is the same as the rotation frequency of the screw 20, a resonance phenomenon occurs, and at this time, the phase difference between the maximum unbalanced mass point of the screw 20 and the maximum vibration point of the body 10 is about 90 °, which easily causes the pump of the screw 20 to be damaged or dangerous in a long-time operation.
Specifically, when the vibration is detected by the vibration sensor 111, the vibration acceleration sensor is used as the vibration acceleration sensorDuring measurement, the vibration acceleration sensor measures a voltage signal, converts the voltage signal into an acceleration signal through vibration sensitivity, converts a vibration amplitude and a vibration phase in a time domain signal into a frequency domain signal through Fourier transform, and thus obtains a corresponding vibration frequency f of the body 101. When the vibration sensor 111 is a vibration velocity sensor, the measured vibration velocity is a vibration acceleration obtained by differentiating the vibration velocity with respect to time, and the vibration frequency f of the body 10 can be obtained by referring to the above1。
In order to obtain the rotational frequency f of the screw 202After the information of the rotation speed of the screw 20 is measured, the number of rotations per unit time is calculated, i.e. the frequency f2。
When the collection and analysis system 40 analyzes, the vibration frequency of the body 10 and the rotation frequency of the screw 20 can be obtained quickly by the above transformation, so as to know whether resonance occurs.
The method comprises the following steps of adjusting the mass balance device according to an analysis result, and eliminating resonance:
when the analysis result is in a non-resonance state, the mass balance device does not need to be adjusted;
and when the analysis result is in the resonance state, adjusting the counterweight mass of the mass balancing device until the analysis result is in the non-resonance state.
The acquisition and analysis system 40 performs acquisition and analysis in real time, so that it is possible to monitor whether the screw 20 pump resonates in real time, and after the resonance occurs, the operation of the screw 20 pump is stopped, the counterweight mass of the mass balancing device is adjusted, and the mass balancing device is started again for monitoring.
In addition, when adjusting the counterweight mass of the mass balance device, the counterweight 31 is attached or detached, and it is sufficient if the resonance state can be eliminated.
In one embodiment of the present invention, the number of the screws 20 is three, the three screws 20 are engaged in sequence, and each screw 20 at least monitors the rotation speed through a rotation speed sensor 121.
Specifically, in this embodiment, each screw 20 corresponds to two rotation speed sensors 121, and since the rotation speeds of the three screws 20 are generally the same, measurement errors are avoided by the plurality of rotation speed sensors 121, when the analysis is performed by the acquisition and analysis system 40, the maximum value and the minimum value of the rotation speed information are removed, and the average value is obtained to obtain the current rotation speed of the screw 20, so as to obtain the rotation frequency, so that the result obtained by the analysis is more accurate.
In addition, vibration sensors 111 are disposed at different positions of the machine body 10 for monitoring vibration conditions at different positions, vibration frequencies and rotation frequencies at different positions are compared one by one, and if all the vibration frequencies and the rotation frequencies are different, the screw 20 pump is in a non-resonance state, and if the vibration frequencies and the rotation frequencies are not the same, the counterweight mass is adjusted according to the above steps. Specifically, in an embodiment, the end cover 12 of the machine body 10, the upper side of the rear portion, the lower side of the rear portion, the upper side of the front portion, and the upper side of the front portion of the machine shell 11 are provided with the vibration sensors 111, and the vibration sensors 111 may be provided at other positions as needed, which is not described again.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A screw pump vibration control structure, comprising:
the vibration monitoring device comprises a machine body, a vibration sensor and a control unit, wherein the machine body is provided with the vibration sensor which is used for monitoring the vibration of the machine body;
the screw rod penetrates through the machine body, a rotating speed sensor is further arranged on the machine body, and the rotating speed sensor is used for monitoring the rotating speed of the screw rod;
the mass balancing device is arranged at the vacant end of the screw rod and used for adjusting the mass of the balance weight;
and the acquisition and analysis system is in communication connection with the vibration sensor and the rotating speed sensor.
2. A screw pump vibration control arrangement according to claim 1, wherein the mass balancing means comprises a mounting disc and a plurality of weights, the mounting disc being fixedly connected at its centre to the screw, the mounting disc having a first surface facing away from the housing, the first surface of the mounting disc having a plurality of spaced mounting locations, the weights being releasably connectable to the mounting locations.
3. A screw pump vibration control structure according to claim 2, wherein the weight block is magnetically connected to the mounting portion.
4. A screw pump vibration control structure according to claim 2, wherein the body includes a casing and an end cap, the end cap being fixed to one end of the casing, the vibration sensor being provided on the casing, the rotation speed sensor being provided on the end cap, the mass balancing device being arranged opposite the end cap.
5. A progressive cavity pump vibration control structure according to claim 4, wherein the second surface of the mounting plate has a sensing mass, the rotation path of which passes between the tachometer transceiver end.
6. A vibration control structure of a screw pump according to any one of claims 1 to 5, wherein the number of the screws is three, three of the screws are engaged in sequence, and the mass balance means is three, and three of the mass balance means and three of the screws are connected in one-to-one correspondence.
7. A vibration control method of a screw pump, comprising the screw pump vibration control structure according to any one of claims 1 to 6; the method comprises the following steps:
obtaining vibration information of the machine body according to the monitoring of the vibration sensor;
monitoring according to the rotation speed sensor to obtain rotation speed information of the screw;
transmitting the vibration information and the rotating speed information to the acquisition and analysis system;
the acquisition and analysis system analyzes the vibration information and the rotating speed information to obtain an analysis result;
and adjusting the mass balance device according to the analysis result to eliminate resonance.
8. A screw pump vibration control method according to claim 7, wherein the step of analysing the vibration information and the rotational speed information by the collection and analysis system to obtain an analysis result comprises:
obtaining the vibration frequency f of the body according to the vibration information1；
Obtaining the screw rotation frequency f according to the rotation speed information2；
When f is2≠f1Then, the analysis result is in a non-resonance state;
when f is2＝f1Then, the analysis result is a resonance state.
9. A screw pump vibration control method according to claim 9, wherein the step of adjusting the mass balance means in dependence on the analysis result to cancel resonance comprises:
when the analysis result is in a non-resonance state, the mass balance device does not need to be adjusted;
and when the analysis result is in a resonance state, adjusting the counterweight mass of the mass balance device until the analysis result is in a non-resonance state.
10. A screw pump vibration control method according to any one of claims 7 to 9, wherein the number of the screws is three, three of the screws are engaged in sequence, and each of the screws is monitored for rotation speed by at least one of the rotation speed sensors.
CN202110383177.4A 2021-04-09 2021-04-09 Screw pump vibration control structure and method Active CN113107840B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113982929A (en) * 2021-09-26 2022-01-28 约克（无锡）空调冷冻设备有限公司 Vibration frequency adjusting system

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