CN209952293U

CN209952293U - Automatic water cutting device based on rotation method

Info

Publication number: CN209952293U
Application number: CN201920595795.3U
Authority: CN
Inventors: 袁承轩
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2020-01-17
Anticipated expiration: 2029-04-28

Abstract

The utility model relates to a petrochemical technical field especially relates to an automatic water cutting device based on rotation method, and this automatic water cutting device drives the metal rotor through the motor that utilizes invariable moment of torsion based on the detection principle of liquid viscosity, rotates in detecting appearance liquid. In the detection sample liquid with different viscosities, the rotating speeds of the metal rotors with constant torque have obvious difference, so that oil and water can be accurately distinguished according to the rotating speeds, and automatic water cutting is realized. This water cutting device can be suitable for various different oils, and relies on the centrifugal force of the high-speed rotatory production of motor, has avoided detecting the adhesion of appearance liquid on detecting the part effectively to can not influence the precision because of detecting the adhesion of appearance liquid, can long-term operation and need not regularly to wash the maintenance, and then when improving the accuracy of cutting water, reduced the cost of cutting water.

Description

Automatic water cutting device based on rotation method

Technical Field

The utility model relates to a petrochemical technical field especially relates to an automatic water cutting ware based on rotation method.

Background

In the storage tank of petrochemical enterprises, both crude oil and finished oil inevitably contain certain moisture, and the presence of the moisture influences the quality of the oil product, brings burden to subsequent processing treatment, and seriously even causes equipment damage and safety accidents. For example, high water content of diesel oil can cause corrosion and damage to engine cylinders, valves and pistons. Therefore, the oil products need to be stored in the oil tank, and water is deposited at the bottom of the storage tank by relying on the principle that the water density is higher than that of the oil products. After the water is accumulated to a certain degree, a tank bottom valve is opened, water is discharged, and the process is the water cutting of the oil tank.

At present, the oil tank has two modes of manual operation and automatic operation. Manual water cutting is to distinguish oil and water by eyes, so that the time for closing the valve is difficult to control, oil products are often mistakenly discharged to a drainage system, the waste of the oil products and environmental pollution are caused, and the operation cost of enterprises is increased. According to statistics, the annual water cut off of each diesel tank is about 180 tons, and if a manual water cutting mode is adopted, the oil content is about 10 tons. Moreover, most of the oil contains harmful materials such as hydrogen sulfide, which damages the health of operators. Therefore, the adoption of the automatic water cutting equipment tends to make the oil tank water cutting equipment selected, which is an inevitable requirement for safe production, environmental protection and efficiency improvement.

The automatic water cutting is realized by identifying oil and water through a mechanical device and an electronic device, if the oil and water are in water, the valve is automatically opened to cut the water, and the valve is immediately closed after the oil content in the water reaches a certain degree. Automatic water cutting devices in use at present are roughly classified into two categories: floating ball (mechanical) and oil-water analysis (electronic). (1) A floating ball type: the floating ball type utilizes the density difference principle of oil and water, and when the water content is high, the floating ball floats upwards to open the valve, and when the oil content is high, the floating ball falls down to close the valve. The floating ball type automatic water cutting device is subjected to continuous optimization and improvement, and is widely applied to various petrochemical enterprises. However, in practical application, the floating ball type water cutting device has many problems, namely, during continuous work, the drain valve of the water cutting device may be out of order due to factors such as corrosion, impurities and the like for a long time, or the lever mechanism is corroded and stuck, and once the stuck fault occurs, the problems of huge direct economic loss, potential safety hazard, environmental pollution and the like can be brought. (2) Oil-water analytical formula: the oil-water analysis type is that the oil-water content is detected by using sensors such as viscosity and density, and the valve is controlled to be opened and closed, so that the oil-water analysis type is safer and more reliable than a mechanical type. The existing oil-water analysis type automatic water cutting device comprises an ultrasonic automatic water cutting device, an image detection automatic water cutting device, a liquid column resonance automatic water cutting device and the like. The ultrasonic automatic water cutting device utilizes the propagation rate difference of ultrasonic waves in water and oil, the ultrasonic waves are incident into liquid through the wall of the tank, the field controller detects and calculates the ultrasonic echo of the upper sensor and the lower sensor, and the oil-water interface in the tank is judged according to the ultrasonic echo time difference of the upper sensor and the lower sensor. If the water level reaches or exceeds the water cutting water level, the field controller generates a water cutting signal to drive the water cutting valve to cut water after a certain time delay. And in the water cutting process, if the oil-water interface in the tank is lower than the water cutting level, the system stops cutting water, and the water cutting process is completed. The method has the advantages that the sensor does not directly contact with a medium and is not limited by the viscosity of the medium, but the requirement on the precision of the ultrasonic sensor is high, and different sensors are selected according to different oil types, so that the universality is poor. The automatic water cutting device for image detection realizes real-time water cutting of the tank through video image acquisition and processing according to the basic fact that water and oil have obvious difference in color. However, the scheme has high requirements on working environment, and oil stains, dust and the like can influence image acquisition to cause result distortion, so that the application of the scheme is limited. The liquid column resonance automatic water cutting device is based on that each fluid has the inherent resonance frequency under a certain temperature. When the oil content in water changes slightly, the resonance frequency and the amplitude of the water change greatly, so that water and oil can be distinguished correctly. The method has the disadvantages that the oil is adhered to the sensor to cause inaccurate measuring results, so that the sensor needs to be cleaned and replaced regularly, and the maintainability needs to be improved; these are undesirable to those skilled in the art.

SUMMERY OF THE UTILITY MODEL

To the problem that above-mentioned exists, the utility model discloses an automatic hydrophone of cutting based on rotation method, wherein, include: the device comprises an oil tank, a water cutting detector, a water cutting controller, a water cutting valve, a sampling pump and a drainage pipeline;

the water cutting detector comprises a sample liquid detection chamber, a rotor, a motor and a rotating speed detection device; a liquid inlet of the sample liquid detection chamber is communicated with the bottom of the oil tank through a pipeline, the output torque of the motor is constant, the rotor extends into the sample liquid detection chamber and is connected with an output shaft of the motor to rotate under the driving of the motor, and the rotating speed detection device is connected with the motor to be used for measuring the rotating speed of the rotor;

the water cutting valve is connected between the oil tank and the drainage pipeline;

the water cutting controller is connected between the rotating speed detection device and the water cutting valve so as to control the switch of the water cutting valve according to the rotating speed of the rotor.

Further, the rotating speed detection device is connected with an output shaft of the motor through a coupler.

Further, the rotating speed detection device is a rotating speed sensor.

Further, the rotating speed detection device is an encoder.

Further, the rotor is a metal rod.

Further, a rotating speed threshold value is preset in the water cut-off controller, and when the rotating speed output by the rotating speed sensor is greater than or equal to the rotating speed threshold value, the water cut-off controller controls the water cut-off valve to be opened;

and when the rotating speed output by the rotating speed sensor is less than the rotating speed threshold value, the water cut-off controller controls the water cut-off valve to be opened.

Further, the liquid outlet of the sample liquid detection chamber is communicated with the oil tank through a sampling pump.

Further, the water cutting controller is connected with the sampling pump.

Furthermore, a moving machine seal is arranged on an output shaft of the motor.

Furthermore, the material of the moving machine seal is rubber.

Compared with the prior art, the utility model has following advantage or beneficial effect:

compared with the existing 'floating ball type' automatic water cutting device, the water cutting device detects the oil-water content by using the rotation of the metal rotor, controls the opening and closing of the valve, does not have the locking fault of a mechanical structure, and is safer and more reliable.

Compared with the existing oil-water analysis type water cutter, the water cutter can effectively avoid the adhesion of oil on a metal rotor by means of the centrifugal force generated by the high-speed rotation of the motor, the accuracy cannot be influenced by the adhesion of the oil in long-term operation, and the regular cleaning and maintenance are not needed.

Drawings

The invention and its features, aspects and advantages will become more apparent from a reading of the following detailed description of non-limiting embodiments with reference to the attached drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.

FIG. 1 is a schematic structural diagram of a cut water detector according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an automatic water cutting device based on a rotation method in an embodiment of the present invention;

fig. 3 is a flowchart illustrating the operation of the water cut controller according to the embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific examples, which should not be construed as limiting the invention.

As shown in fig. 1 to 3, the present embodiment relates to an automatic water cutting device based on a rotation method, which can be used for cutting water from an oil tank; specifically, this automatic water cut ware includes: the system comprises an oil tank 5, a water cut detector 1, a water cut controller 2, a water cut valve 3, a sampling pump 4 and a drainage pipeline 6.

The oil tank 5 stores therein an oil containing water, which is crude oil, fuel oil, or the like, and the water is deposited on the bottom of the oil tank 5 after sedimentation because the density of water is higher than that of oil.

The water cut detector 1 comprises a sample liquid detection chamber 11, a metal rotor 12 (the metal rotor 12 can be a metal rod), a motor 15, a coupling 16 and a rotating speed detection device 17; the liquid inlet of the sample liquid detection chamber 11 is communicated with the bottom of the oil tank 5 through a pipeline, under the action of static pressure, liquid (the liquid is water, but may also include oil) precipitated at the bottom of the oil tank 5 can be pressed into the sample liquid detection chamber 11 to be used as detection sample liquid for detection, and the liquid outlet of the sample liquid detection chamber 11 is communicated with the oil tank 5 through the sampling pump 4, so that the sampling pump 4 can continuously extract a sample from the sample liquid detection chamber 11 to return to the oil tank 5, thereby ensuring that the sample in the sample liquid detection chamber 11 is consistent with the liquid characteristics at the bottom of the oil tank 5. The motor 15 outputs a constant torque, and the output shaft 13 of the motor 15 is also provided with a moving machine seal 14 to prevent the detection sample liquid rotating at a high speed from overflowing so as to influence the work of the motor 15; the metal rotor 12 extends into the sample liquid detection chamber 11 and is connected with an output shaft 13 of a motor 15 so as to rotate in the detection sample liquid under the driving of the motor 15; the rotation speed detecting device 17 is connected to the motor 15 through the coupling 16 for measuring the rotation speed of the metal rotor 12, that is, the motor 15 drives the metal rotor 12 to rotate in the detection sample liquid in the sample liquid detection chamber 11 with a constant torque, because the rotation speed of the motor 15 is related to the output torque of the motor 15 and the power of the motor 15, the rotation speed of the motor 15 is constant under the condition of constant torque and power, and further, theoretically, the rotation speed of the metal rotor 12 is also constant under the condition of no resistance of the metal rotor 12, however, the viscosity of the detection sample liquid in the sample liquid detection chamber 11 inevitably affects the rotation speed of the metal rotor 12, and as is well known, the viscosity difference of water and oil is large, the viscosity of pure water is generally 1 centipoise, and the viscosity of engine oil is about 80 centipoise, so the viscosity resistance of water and oil is significantly different. When the water and the oil form a mixture, the viscous resistance increases with the increase of the oil content and accordingly becomes larger, so that the rotation speed of the metal rotor 12 becomes smaller with the increase of the oil content of the sample liquid detected in the sample liquid detection chamber 11, so that the oil and the water can be accurately distinguished according to the rotation speed of the metal rotor 12, and since the metal rotor 12 is connected to the output shaft 13 of the motor 15, the rotation speed detection device 17 is connected to the motor 15 through the coupling 16, so that the motor 15 can transmit the rotation speed of the metal rotor 12 to the rotation speed detection device 17 through the coupling 16.

In the embodiment of the present invention, the water cut-off valve 3 is connected between the oil tank 5 and the drainage pipeline 6, specifically, the drainage pipeline 6 is connected to the pipeline between the oil tank 5 and the sample liquid detection chamber 11 through the water cut-off valve 3, that is, the water cut-off valve 3 is opened, the oil tank 5 is communicated with the drainage pipeline 6 to discharge the liquid at the bottom of the oil tank 5 into the drainage pipeline 6, the water cut-off valve 3 is closed, the oil tank 5 is not communicated with the drainage pipeline 6, and the liquid at the bottom of the oil tank 5 cannot be discharged into the drainage pipeline 6; the water cutting controller 2 is connected between the rotation speed detecting device 17 and the water cutting valve 3 to control the opening and closing of the water cutting valve 3 according to the rotation speed of the metal rotor 12, and it is worth mentioning that the method and the software flow of the water cutting controller 2 for controlling the opening and closing of the water cutting valve 3 according to the rotation speed of the metal rotor 12 can adopt the method and the software flow known by the technical personnel in the field; specifically, in the present invention, a rotation speed threshold (the rotation speed threshold is the rotation speed corresponding to the metal rotor when the oil content reaches a preset value) is preset in the water cutting controller 2, the water cutting controller 2 is used for reading the rotation speed output by the rotation speed detection device 17 and comparing the rotation speed with the preset rotation speed threshold to determine whether the oil content in the detected sample liquid exceeds the standard, when the rotation speed output by the rotation speed sensor is greater than or equal to the rotation speed threshold, that is, the viscosity of the sample liquid in the sample liquid detection chamber 11 is low, the oil content is lower than or equal to the oil content threshold corresponding to the preset rotation speed threshold, the water cutting controller 2 determines that the detected sample liquid can be discharged as water, the water cutting controller 2 sends a water cutting starting command to control the water cutting valve 3 to be opened into a water cutting state, so as to discharge the liquid at the bottom of the oil tank 5 into the; when the rotating speed output by the rotating speed detection device 17 is less than the rotating speed threshold, that is, the viscosity of the sample solution in the sample solution detection chamber 11 is high, and the oil content is higher than the oil content threshold corresponding to the preset rotating speed threshold, the water cut-off controller 2 judges that the oil content in the detected sample solution exceeds the standard, the water cut-off controller 2 sends a water cut-off stopping command, and the water cut-off valve 3 is closed, so that the liquid at the bottom of the oil tank 5 cannot be discharged into a drainage pipeline.

In the embodiment of the present invention, as shown in fig. 3, the working process of the water cutting controller 2 specifically includes:

step S1, start;

step S2, initializing the motor 15 of the water cut detector 1;

step S3, initializing the cut-off valve 3;

step S4, starting the motor 15 of the water cut detector 1;

step S5, detecting whether the motor 15 of the water cut detector 1 is in failure, if the motor 15 of the water cut detector 1 is not in failure, directly carrying out the next step, and if the motor 15 of the water cut detector 1 is in failure, carrying out step S12;

step S6, measuring the rotating speed of the motor 15 of the water cutting detector 1 through the rotating speed detection device 17;

step S7, performing oil-water analysis, namely comparing the rotating speed of the motor 15 of the water cut detector 1 with a rotating speed threshold value preset by the water cut controller 2;

step S8, judging whether the oil content in the detection sample liquid exceeds a preset value according to the comparison result; if the preset value is exceeded, the water cutting valve 3 is set to be closed, and if the preset value is not exceeded, the water cutting valve 3 is set to be opened;

step S9, the state of the water cutting valve 3 is read back;

step S10, determining that the state of the water shut-off valve 3 matches the analysis result, and if the state of the water shut-off valve 3 matches the analysis result, determining that the state is correct, returning to step S5; if the state of the water cut valve 3 is not in accordance with the analysis result, judging that the state is wrong, and carrying out the next step;

step S11, outputting an alarm;

step S13, cutting off the power supply;

step S14 ends.

Preferably, the rotation speed detecting device 17 is a rotation speed sensor or an encoder, as long as the rotation speed detecting device 17 can detect the rotation speed of the metal rotor 12 and output the rotation speed to the switching controller 2.

Preferably, the motor 15 is a servo motor.

Preferably, the material of the moving machine seal 14 is rubber, so as to improve the sealing effect of the moving machine seal 14.

Preferably, the cut water controller 2 is connected to the sampling pump 4 to control the frequency of the sampling pump 4 to pump the detection solution to the tank.

To sum up, the utility model discloses an automatic water cutting device based on rotation method, this automatic water cutting device are based on the detection principle of liquid viscosity, drive the metal rotor through the motor that utilizes invariable moment of torsion, rotate in detecting sample liquid. In the detection sample liquid with different viscosities, the rotating speeds of the metal rotors with constant torque have obvious difference, so that oil and water can be accurately distinguished according to the rotating speeds, and automatic water cutting is realized. This water cutting device can be suitable for various different oils, and relies on the centrifugal force of the high-speed rotatory production of motor, has avoided detecting the adhesion of appearance liquid on detecting the part effectively to can not influence the precision because of detecting the adhesion of appearance liquid, can long-term operation and need not regularly to wash the maintenance, and then when improving the accuracy of cutting water, reduced the cost of cutting water.

Those skilled in the art will appreciate that variations may be implemented by those skilled in the art in combination with the prior art and the above-described embodiments, and will not be described herein in detail. Such variations do not affect the essence of the present invention, and are not described herein.

The above description is directed to the preferred embodiment of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that devices and structures not described in detail are understood to be implemented in a manner common in the art; without departing from the scope of the invention, it is intended that the present invention shall not be limited to the above-described embodiments, but that the present invention shall include all the modifications and variations of the embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still fall within the protection scope of the technical solution of the present invention, where the technical entity does not depart from the content of the technical solution of the present invention.

Claims

1. An automatic water cutting device based on a rotation method is characterized by comprising: the device comprises an oil tank, a water cutting detector, a water cutting controller, a water cutting valve and a drainage pipeline;

the oil tank is stored with oil containing water;

2. The automatic water cutting device based on the rotation method as claimed in claim 1, wherein the rotation speed detection means is connected with an output shaft of the motor through a coupling.

3. The automatic water cutter based on the rotation method as claimed in claim 1, wherein the rotation speed detecting means is a rotation speed sensor.

4. The automatic water cutting device based on the rotation method as claimed in claim 1, wherein the rotation speed detecting means is an encoder.

5. The automatic water cutter based on the rotation method as claimed in claim 1, wherein the rotor is a metal rotor.

6. The automatic water cutting device based on the rotation method according to claim 3, wherein the water cutting controller is preset with a rotation speed threshold value, and when the rotation speed output by the rotation speed sensor is greater than or equal to the rotation speed threshold value, the water cutting controller controls the water cutting valve to open;

7. The automatic water cutter based on the rotary method as claimed in claim 1, wherein the liquid outlet of the sample liquid detection chamber is communicated with the oil tank through a sampling pump.

8. The automatic water cutter based on the rotary method as claimed in claim 7, wherein the water cutting controller is connected to the sampling pump.

9. The automatic water cutting device based on the rotation method as claimed in claim 1, wherein a moving mechanical seal is further provided on an output shaft of the motor.

10. The automatic water cutter based on the rotation method as claimed in claim 9, wherein the moving machine seal is made of rubber.