CN109915336B - Pumping device for conveying crude oil - Google Patents
Pumping device for conveying crude oil Download PDFInfo
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- CN109915336B CN109915336B CN201910216485.0A CN201910216485A CN109915336B CN 109915336 B CN109915336 B CN 109915336B CN 201910216485 A CN201910216485 A CN 201910216485A CN 109915336 B CN109915336 B CN 109915336B
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- 238000005086 pumping Methods 0.000 title claims abstract description 72
- 239000010779 crude oil Substances 0.000 title claims abstract description 60
- 239000003921 oil Substances 0.000 claims abstract description 74
- 238000003860 storage Methods 0.000 claims abstract description 55
- 239000003208 petroleum Substances 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 23
- 238000004891 communication Methods 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 13
- 230000002159 abnormal effect Effects 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 10
- 238000013016 damping Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000033001 locomotion Effects 0.000 description 12
- 230000008901 benefit Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011345 viscous material Substances 0.000 description 1
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Abstract
The invention discloses a pumping device for conveying crude oil, which comprises a petroleum storage tank (11), a reciprocating plunger pump (3) and a petroleum conveying pipe (12), wherein the reciprocating plunger pump (3) comprises a driving side and an output side, a driving piston (31) is arranged on the driving side, a first oil outlet branch and a second oil outlet branch are arranged on the output side, and the two branches are connected in parallel.
Description
Technical Field
The invention relates to the field of petroleum transportation, in particular to a pumping device for transporting crude oil with viscous property.
Background
The properties of petroleum vary according to production places, the density is 0.8-1.0 g/cm3, the viscosity range is wide, the solidifying point difference is large (30-60 ℃), the boiling point range is from normal temperature to more than 500 ℃, the petroleum can be dissolved in various organic solvents, is insoluble in water, and can form emulsion with water. The technology of transportation pumping of crude oil has been a technical problem in the art due to the viscous nature of petroleum. Generally, a power system for crude oil transportation is expected to improve the power of a driving motor of a pumping device as much as possible, for example, the pumping speed is improved to improve the transportation efficiency, currently, a plunger pump is generally adopted for petroleum pumping, the plunger pump realizes suction and discharge by means of the change of a sealed volume caused by the reciprocating motion of a plunger in a cylinder body, and the plunger pump has the advantages of high pressure, compact structure, convenient flow regulation and the like, so that the plunger pump is widely applied to systems requiring high pressure, large flow and high power and occasions requiring flow regulation. However, the existing plunger pump system has the problems of low pumping efficiency and low working reliability of the system. To this end, the following object is proposed.
The first purpose of the invention is to provide an efficient pumping system, which effectively utilizes electric energy and improves the energy efficiency utilization ratio of pumping operation.
A second object of the invention is to provide a reliable hydraulic reversing system so that the piston is always in a reliable motion during the pumping operation.
The third purpose of the invention is that the pressure of the hydraulic reversing system is always in a monitoring state, and the pumping pressure can be automatically adjusted according to the pressure detection device, so that the pressure overload is prevented.
A fourth object of the present invention is to provide a hydraulic directional control system that can always maintain efficient and stable operation without damaging the controller when replacing hardware and rewriting control programs.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide the following solutions to the above-mentioned deficiencies in the prior art.
A pumping device for conveying crude oil comprises an oil storage tank, a reciprocating plunger pump and an oil conveying pipe, wherein the reciprocating plunger pump comprises a driving side and an output side, a driving piston is arranged on the driving side, a rodless side of the driving piston is a left driving cavity, a rod side of the driving piston is a right driving cavity, an output piston is arranged on the output side, a rod side of the output piston is a left output cavity, a rodless side of the output piston is a right output cavity, the driving piston and the output piston are connected into a whole through a piston rod, and the output piston slides in a cavity of the output side under the driving of the driving piston;
the first oil outlet branch comprises a first one-way valve, a port A1, a left output cavity, a port A2, a third one-way valve and an oil delivery pipe which are connected in sequence; the first one-way valve and the third one-way valve are communicated to the side of the petroleum conveying pipe in a one-way mode;
the second oil outlet branch comprises a second one-way valve, a port B1, a right output cavity, a port B2, a fourth one-way valve and an oil delivery pipe which are connected in sequence; the second one-way valve and the fourth one-way valve are communicated to the side of the petroleum conveying pipe in a one-way mode;
the first oil outlet branch and the second oil outlet branch are connected in parallel and are arranged between the oil storage tank and the oil delivery pipe.
The electromagnetic reversing valve is a three-position four-way valve and is provided with a left electromagnetic coil and a right electromagnetic coil, a valve core is normally positioned at a middle position by a left spring and a right spring, and is driven by the left electromagnetic coil or the right electromagnetic coil to deflect to a first position or a second position, the middle position is normally positioned, a port F is cut off, and a port G is simultaneously communicated with a port H and a port I; in the first position, port F is in communication with port I and port H is in communication with port G; in the second position, port F is in communication with port H and port G is in communication with port I;
the hydraulic reversing valve is a three-position four-way valve, a valve core of the hydraulic reversing valve is normally positioned at a middle position by a left spring and a right spring, and is driven by a right hydraulic cavity or a left hydraulic cavity to be biased to a left position or a right position, when the middle position is adopted, a port P is communicated with a port T, the port C2 is cut off from the port D2, when the middle position is adopted, the port P is communicated with a port C2, the port T is communicated with a port D2, when the middle position is adopted, the port P is communicated with the port D2, and when the right position is adopted, the port C2 is;
the oil return groove is communicated with a port P of the hydraulic reversing valve through a power pump and a pressure detection module, a port T of the hydraulic reversing valve is communicated with the oil return groove through a pressure regulating valve, a port F of the electromagnetic reversing valve is connected to a port E1 between the port T and the pressure regulating valve, a port G of the electromagnetic reversing valve is connected to a port E2 between the pressure regulating valve and the oil return groove, a port H of the electromagnetic reversing valve is connected with a left hydraulic cavity of the hydraulic reversing valve, and a port I of the electromagnetic reversing valve is connected with a right hydraulic cavity of the hydraulic reversing valve; a port C2 of the hydraulic reversing valve is sequentially connected with a port C1 of the reciprocating plunger pump and the left driving cavity, and a port D2 of the hydraulic reversing valve is sequentially connected with a port D1 of the reciprocating plunger pump and the right driving cavity;
the pressure regulating valve can provide a change in the amount of fluid damping in the line.
The pressure relief valve is connected with the pressure detection module in parallel, a conical valve core is arranged in a valve cavity of the pressure relief valve, the conical valve core divides the valve cavity into a top cavity and a back cavity, the conical valve core is provided with a top surface and a back surface, the area of the top surface is smaller than that of the back surface, the top surface is surrounded by an inclined ring surface, a through hole is formed between the inclined ring surface and the back surface, the top cavity and the back cavity are communicated through the through hole, a back pressure spring is arranged between the back surface and the inner wall of the valve cavity, the conical valve core is loaded on the port J by the back pressure spring and seals the port J under a normal state, when the back cavity is relieved to an oil return groove through the on-off valve, the power pump pushes the conical valve core to the back cavity through the port K of the top cavity and opens the port J, and when the on-off valve is closed again, the power pump stores; the port J of the top cavity is connected with the port P through a fifth one-way valve, the fifth one-way valve conducts to the port P in a one-way mode, the port K of the top cavity is connected with the power pump, and the port L of the back cavity is connected with the oil return groove through an on-off valve.
Preferably, the device also comprises a controller, the controller is electrically connected with the electromagnetic directional valve, the pressure regulating valve, the pressure release valve, the power pump and the on-off valve in a control manner, the controller can detect the position of the valve cavity of the driving piston on the driving side, the controller is communicated with the cloud, the power pump comprises a motor, a first speed control device for controlling the speed of the motor and a second speed control device for monitoring the state of the motor, the first speed control device comprises a first control unit, the second speed control device comprises a second control unit, when the controller determines that the rotation state of the motor is abnormal in judgment, the controller can stop the work of the first speed control device and convert the state of the motor monitored by the second speed control device into the speed of the motor to drive the motor again, and sends a signal to the mobile terminal to prompt an operator to replace the first speed control device, and then the first speed control device is used as a monitor to monitor the state of the motor again, and the controller judges whether the rotation state of the motor is abnormal or not.
The first speed control device and the second speed control device are identical in structure and respectively comprise a first storage area for storing upgrading information, the controller comprises a processor, a guide area and a second storage area, when the controller runs an application program stored in the application program storage area corresponding to the first speed control device or the second speed control device, the controller actively detects the first storage area in which the upgrading information is stored in the first speed control device or the second speed control device, acquires the upgrading information from the first speed control device or the second speed control device and writes the upgrading information into the second storage area, the processor of the controller runs the guide program of the guide area, calls the upgrading information in the second storage area and covers the original program information corresponding to the original speed control device stored in the second storage area.
The invention also proposes a method for pumping for transporting crude oil, the aforementioned pumping device for transporting crude oil being characterized in that:
s1: opening the on-off valve, and enabling the power pump to work to enable a hydraulic medium to be filled between the back cavity of the pressure release valve and the on-off valve; closing the on-off valve, and continuing to work by the power pump to accumulate pressure in the back cavity of the pressure release valve and seal the port J of the pressure release valve;
s2: the power pump continues to work, the pressure regulating valve increases damping, the valve core of the electromagnetic reversing valve is offset, the valve core of the hydraulic reversing valve is offset under the liquid supply pressure of the electromagnetic reversing valve, the power pump drives the driving piston of the reciprocating plunger pump to reciprocate, and the output piston outputs the oil in the oil storage tank and the pressure to the oil conveying pipe;
s3: the pressure detection module detects a pressure parameter of the hydraulic pipeline;
s4: the controller judges whether the pressure parameter of the hydraulic pipeline is normal, if so, the S3 is repeatedly executed; if not, the pressure parameter is higher than the threshold value, S5 is executed;
s5, opening the on-off valve to release pressure through the pressure release valve, and reducing the rotating speed of the power pump, wherein the controller pre-judges the time T required by the speed reduction of the power pump, and closes the on-off valve at the moment of T-delta T, so that the pressure release valve stores pressure to the back cavity in advance of delta T time, and stably operates at the current speed after the speed reduction of the power pump at the moment of T, and the pressure release valve also simultaneously closes a port J, wherein delta T is the preset advance time;
s6: the controller judges whether the pressure parameter of the hydraulic pipeline is normal again, if so, the S3 is executed repeatedly; if not, the pressure parameter is higher than the preset value, and S7 is executed;
s7, the controller judges whether the first speed control device of the motor of the power pump operates normally through the monitoring and feedback data of the second speed control device, if so, the S3 is repeatedly executed after the preset time, and if not, the S8 is executed;
s8: the operator replaces the first speed control device and switches the second speed control device to control the motor of the power pump;
s9: the controller judges whether the version information of the first speed control device is consistent with the program information in the controller, if so, the S3 is repeatedly executed after the preset time; if not, go to S10;
s10: when the controller runs the application program stored in the application program storage area corresponding to the speed control device, the controller actively detects a first storage area in which the upgrading information is stored in the speed control device, acquires the upgrading information from the speed control device and writes the upgrading information into a second storage area of the controller, and then a processor of the controller runs the bootstrap program of the bootstrap area, calls the upgrading information in the second storage area, covers the original program information corresponding to the original speed control device stored in the second storage area, and then repeatedly executes S3 or ends after a preset time.
Preferably, the pumping device for conveying crude oil is multiple and connected in sequence; the controllers of the pumping devices for conveying the crude oil are in communication connection with the cloud end to form a data network and share operation parameters, when the pressure relief and speed reduction conditions sequentially occur in N continuous pumping devices for conveying the crude oil, the conveyed petroleum medium is judged to be suitable for new pumping parameters, the cloud end collects data of the N continuous pumping devices for conveying the crude oil, and power pump parameters of the pumping devices for conveying the crude oil at the downstream are adjusted after correction; if any pumping device for conveying crude oil is decompressed and the power pump is decelerated, and the pumping devices for conveying crude oil on the upstream and the downstream work normally, the cloud end judges that the hydraulic pipeline of the pumping device for conveying crude oil is in fault, and sends an alarm signal to the terminal.
Preferably, in step S10, the obtaining the upgrade information from the first storage area of the speed control device, and writing the upgrade information into the second storage area of the controller includes: the controller sends a plurality of data packet request signals to the speed control device, and after each data packet request signal is sent, one data packet of the upgrading information which is sent by the speed control device and corresponds to the data packet request signal is obtained from the speed control device. If the controller detects that the sequence number of the data packet of the latest acquired upgrading information is not continuous with the sequence number of the previous data packet, a retransmission signal is sent to the speed control device so that the speed control device starts to retransmit the data packet with the continuous sequence number with the sequence number of the previous data packet.
Has the advantages that:
compared with the prior art, the invention has the following advantages:
1) the pumping device for conveying crude oil uses the double-acting hydraulic drive reciprocating plunger pump, can continuously pump petroleum medium to the petroleum conveying pipe in the reciprocating motion of the piston, and has no idle motion of a hydraulic cylinder, thereby reducing the noise and vibration of equipment and improving the efficiency of the plunger pump.
2) The electromagnetic directional valve is used for controlling the hydraulic directional valve so as to control the reciprocating plunger pump. The valve core of the electromagnetic reversing valve can be adjusted by small current, and the pressure medium supplied by the power pump is guided to control the movement of the valve core of the hydraulic reversing valve, so that the force for controlling the movement of the valve core of the hydraulic reversing valve and the force of the pressure medium flowing through the valve core of the hydraulic reversing valve are in an order of magnitude, and the reliability of valve core reversing is greatly improved.
3) The pressure detection module is connected with a pressure release valve in parallel, the pressure release valve fully utilizes the particularity of fluid movement, no matter the top cavity and the back cavity are filled with pressure medium under normal state, but because the area of the side surface is smaller than that of the back surface and the thrust of a back pressure spring, the cone-shaped valve core reliably seals a port J, once the pressure of the hydraulic system is required to be released, the back cavity releases the pressure to an oil return groove through an on-off valve, because the diameter of a through hole of the cone-shaped valve core is very small, the pressure medium of the top cavity cannot be supplemented into the back cavity from the through hole, the cone-shaped valve core is biased to the back pressure spring under the action of a power pump, at the moment, the pressure of the whole hydraulic system is instantly reduced, and simultaneously, the power pump also reduces the speed, and has the advantage that the pressure detection module can be damaged due to pressure overload, the pressure medium can be shunted to a part to a pipeline connected with the pressure detection module in parallel through, and a protection pressure detection module.
4) After the pressure of the pressure relief valve is instantaneously relieved, the power pump also decelerates, the on-off valve is closed again, and at the moment, the power pump supplies pressure medium to the back cavity gradually through the through hole of the conical valve core, so that the port J of the pressure relief valve can be closed again.
5) The hydraulic system opens the on-off valve and releases pressure through the pressure release valve, and the system pre-judges the time T required by the uniform speed reduction of the power pump and closes the on-off valve at the moment of T-delta T in order to ensure that the whole hydraulic system stably reduces the pressure.
6) The first speed control device and the second speed control device are used for controlling and monitoring the working condition of the motor of the power pump, and after one speed control device cannot work normally, the other speed control device can be switched from a monitoring state to a control state to continue working. After the abnormally working speed control device is updated, if the program of the controller needs to be updated, the upgrading information of the speed control device is firstly stored in the storage area of the controller, then the transmitted upgrading information is called, and after the upgrading information is completely written into the second storage area, the original program is called and covered. The controller damage caused by accidents due to the fact that the original program is directly covered after the speed control device obtains the upgrading information is avoided.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals:
11: oil storage tank, 12: oil delivery pipe, 21: a first check valve; 22: a second one-way valve; 23: a third check valve; 24: a fourth check valve; 3: reciprocating plunger pump, 31: drive piston, 32: output piston, 33: left drive chamber, 34: right drive chamber, 35: left output chamber, 36: right output chamber, 37: piston rod, 4: electromagnetic directional valve, 5: hydraulic directional control valve, 6: pressure regulating valve, 7: relief valve, 71: top surface, 72: inclined annulus, 73: through hole, 74: back pressure spring, 75: back, 76: fifth check valve, 81: power pump, 82: on-off valve, 83: pressure detection module, 9: an oil return groove.
The reciprocating plunger pump 3 has six ports of port a1, port a2, port B1, port B2, port C1 and D1;
the electromagnetic directional valve 4 is provided with four ports, namely a port F, a port G, a port H and a port I;
a hydraulic directional valve 5 having four ports, port P, port T, port C2, port D2;
and a relief valve 7 having a port J, a port K and a port L.
Detailed Description
The following description of the embodiments of the present invention refers to the accompanying drawings and examples:
it should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined by the following claims, and all modifications of the structures, changes in the proportions and adjustments of the sizes and other dimensions which are within the scope of the disclosure should be understood and encompassed by the present disclosure without affecting the efficacy and attainment of the same.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Referring to fig. 1, there is shown an embodiment of a pumping apparatus for transporting crude oil, which comprises an oil storage tank 11, a reciprocating plunger pump 3 and an oil transporting pipe 12, wherein in the prior art, the plunger pump is operated in a single-pass mode, and a piston return stroke after pressure output is in a no-load operation. In the invention, the reciprocating plunger pump 3 comprises a driving side and an output side, wherein the driving side is provided with a driving piston 31, the rodless side of the driving piston 31 is a left driving cavity 33, the rod side of the driving piston 31 is a right driving cavity 34, the output side is provided with an output piston 32, the rod side of the output piston 32 is a left output cavity 35, the rodless side of the output piston 32 is a right output cavity 36, the driving piston 31 and the output piston 32 are connected into a whole through a piston rod 37, and the output piston 32 slides in the cavity on the output side under the driving of the driving piston 31; the first oil outlet branch comprises a first check valve 21, a port A1, a left output cavity 35, a port A2, a third check valve 23 and an oil delivery pipe 12 which are connected in sequence; the first check valve 21 and the third check valve 23 are communicated to the petroleum conveying pipe 12 in a one-way mode; the second oil outlet branch comprises a second one-way valve 22, a port B1, a right output cavity 36, a port B2, a fourth one-way valve 24 and an oil delivery pipe 12 which are connected in sequence; the second check valve 22 and the fourth check valve 24 are communicated to the petroleum delivery pipe 12 in a one-way mode; the first oil outlet branch is connected with the second oil outlet branch in parallel.
For a hydraulic system, especially for a pumping hydraulic system in the oil field, the reliability of a reversing valve is directly related to the reliability of the whole system, currently, a solenoid valve is generally adopted for the reversing valve of a hydraulic cylinder in the prior art, but the electromagnetic suction force of the solenoid valve is small, and in the pumping system, the suction force of the solenoid valve is not enough to reliably control the offset motion of a valve core due to the high-pressure liquid delivery, so that the adjustment of the hydraulic structure in the prior art is needed.
In the embodiment, the direction of the hydraulic reversing valve is creatively provided to be adjusted by using the electromagnetic reversing valve, and the specific mode is as follows, the pumping device for conveying crude oil further comprises the electromagnetic reversing valve 4, the electromagnetic reversing valve 4 is a three-position four-way valve and is provided with a left electromagnetic coil and a right electromagnetic coil, a valve core is normally positioned at a middle position by a left spring and a right spring, the valve core is driven by the left electromagnetic coil or the right electromagnetic coil to deflect to a first position or a second position, the middle position is normally, a port F is cut off, the port G is simultaneously communicated with a port H and a port I, the port F is communicated with the port I at the first position, the port H is communicated with the port G, the port F is communicated with the port H at the second position, and the port G is;
a hydraulic directional control valve 5 which is a three-position four-way valve, a spool of which is normally positioned at a middle position by two springs on the left and right, and is biased to a left position or a right position by the drive of a right or left hydraulic chamber, wherein when the middle position is adopted, a port P is communicated with a port T, the port C2 is cut off from the port D2, when the middle position is adopted, the port P is communicated with a port C2, the port T is communicated with a port D2, when the middle position is adopted, the port P is communicated with a port D2, and the port C2 is communicated with the port T;
the oil return groove 9 is communicated with a port P of the hydraulic reversing valve 5 through a power pump 81 and a pressure detection module 83, a port T of the hydraulic reversing valve 5 is communicated with the oil return groove 9 through a pressure regulating valve 6, a port F of the electromagnetic reversing valve 4 is connected with a port E1 between the port T and the pressure regulating valve 6, a port G of the electromagnetic reversing valve 4 is connected with a port E2 between the pressure regulating valve 6 and the oil return groove 9, a port H of the electromagnetic reversing valve 4 is connected with a left hydraulic cavity of the hydraulic reversing valve 5, and a port I of the electromagnetic reversing valve 4 is connected with a right hydraulic cavity of the hydraulic reversing valve 5; the port C2 of the hydraulic reversing valve 5 is connected with the port C1 of the reciprocating plunger pump 3 and the left driving cavity 33 in sequence, and the port D2 of the hydraulic reversing valve 5 is connected with the port D1 of the reciprocating plunger pump 3 and the right driving cavity 34 in sequence;
the pressure regulating valve 6 is capable of providing a change in the magnitude of the fluid damping in the line.
In use, the valve cores of the electromagnetic directional valve 4 and the hydraulic directional valve 5 are both in the middle position, the pressure medium supplied by the power pump 81 passes through the port P, the port T, the port E1, the pressure regulating valve 6 and the port E2 in sequence through the pressure detection module 83 and then reaches the oil return groove, and no pressure is supplied to the reciprocating plunger pump in this state;
when pressure needs to be supplied to the reciprocating plunger pump, taking the electromagnetic directional valve as an example of the first position, at this time, the port F is communicated with the port I, the port H is communicated with the port G, meanwhile, the damping of fluid passing through is increased by the pressure regulating valve, the pressure medium flowing out from the port T of the hydraulic directional valve is pressed into the port F of the electromagnetic directional valve and then enters the right hydraulic cavity of the hydraulic directional valve through the port I, the valve core of the hydraulic directional valve is pushed to the left position, the port P is communicated with the port C2, the pressure of the pressure regulating valve is released without providing damping effect, the pressure medium enters the C1 from the port C2 and then enters the left driving cavity 33, the pressure medium in the right driving cavity 34 passes through the port D2, the port T flows back into the oil return groove 9, the pressure medium in the left driving cavity 33 moves the driving piston 31 to the right and presses oil in the right output cavity 36 into the oil conveying pipe 12, and at the same time, the output piston, due to the two check valves, the first check valve 21 and the third check valve 23, the oil in the oil storage tank 11 is sucked into the left output chamber 35 in preparation for being pressed into the oil delivery pipe 12 upon the return movement of the output piston 32.
The advantage of controlling the hydraulic directional control valve 5 and thus the reciprocating plunger pump by means of the electromagnetic directional control valve 4 is that the spool of the electromagnetic directional control valve 4 can be adjusted by means of small current, and the pressure medium supplied by the power pump 81 is guided to control the movement of the spool of the hydraulic directional control valve, so that the force for controlling the movement of the spool of the hydraulic directional control valve and the force of the pressure medium flowing through the spool of the hydraulic directional control valve are in an order of magnitude, and the reliability of spool direction change is greatly improved.
Here, only the first position of the electromagnetic directional valve 4 is taken as an example, and the direction change principle in the second position is not described in detail.
Since petroleum is a viscous substance and the properties of crude oil produced in different batches and different times always change, the power pump 81 of the hydraulic system always wants to work efficiently under the pressure critical condition, which puts a very high requirement on the pressure control in the hydraulic system, and therefore, the technical scheme of connecting the pressure relief valve in parallel on the pressure detection module 83 is creatively provided in the embodiment.
In this embodiment, the pressure release valve 7 is further included, the pressure release valve 7 is connected in parallel with the pressure detection module 83, a conical valve core is arranged in a valve cavity of the pressure release valve 7, the conical valve core divides the valve cavity into a top cavity and a back cavity, the conical valve core has a top surface 71 and a back surface 75, the area of the top surface is smaller than that of the back surface, the top surface 71 is surrounded by an inclined ring surface 72, a through hole 73 is arranged between the inclined ring surface 72 and the back surface 75, the top cavity is communicated with the back cavity through the through hole 73, a back pressure spring 74 is arranged between the back surface 75 and the inner wall of the valve cavity, under a normal state, the back pressure spring 74 loads the cone-shaped valve core on the port J and seals the port J, when the back cavity is decompressed to the oil return groove 9 through the on-off valve 82, the power pump 81 pushes the cone-shaped valve core to the back cavity through the port K of the top cavity and opens the port J, and when the on-off valve 82 is closed again, the power pump 81 stores pressure through the through hole 73 and finally enables the cone-shaped valve core to be reloaded on the port J and seals the port J; the port J of the top chamber is connected with the port P through the fifth check valve 76, the port K of the top chamber is connected with the power pump 81, and the port L of the back chamber is connected with the oil return groove 9 through the on-off valve 82.
The pressure release valve 7 fully utilizes the particularity of fluid movement, when the pressure release valve is located in a normal state, no matter the top cavity and the back cavity are filled with a pressure medium, but because the area of the inclined side surface is smaller than that of the back surface, and the thrust of the back pressure spring 74 is provided, the conical valve core reliably seals the port J, once the pressure release of a hydraulic system is needed, the back cavity releases the pressure to the oil return groove 9 through the on-off valve 82, because the diameter of the through hole 73 of the conical valve core is small, the pressure medium of the top cavity cannot be supplied into the back cavity from the through hole 73, the conical valve core biases towards the back pressure spring 74 under the action of the power pump 81, at the moment, the pressure of the whole hydraulic system can be instantly reduced, meanwhile, the power pump 81 can reduce the speed, and the pressure overload can possibly damage the pressure detection module 83, in the embodiment, when the pressure release valve 7 releases the pressure, the pressure medium can be shunted to a part to a pipeline connected with the pressure detection module 83 in, the protection pressure detection module 83.
As will be appreciated by those skilled in the art, as a continuous oil supply device, it is not desirable that the sudden drop of the fluid pressure during the oil transportation process is large, so that after the instantaneous pressure relief of the pressure relief valve 7, the power pump 81 also slows down, and then closes the on-off valve 82 again, at this time, the power pump 81 supplies the pressure medium to the back cavity gradually through the through hole 73 of the conical valve core, and therefore, the port J of the pressure relief valve 7 is closed again.
The device also comprises a controller which is electrically connected with the electromagnetic directional valve 4, the pressure regulating valve 6, the pressure relief valve 7, the power pump 81 and the on-off valve 82 in a controlling manner and can detect the position of the valve cavity of the driving piston 31 on the driving side.
A method for pumping for transporting crude oil, which uses the above-mentioned pumping device for transporting crude oil, characterized in that:
s1: opening the on-off valve 82, and enabling the power pump 81 to work to enable a hydraulic medium to be filled between the back cavity of the pressure release valve 7 and the on-off valve 82;
s2: closing the on-off valve 82, and operating the power pump 81 to accumulate pressure in the back cavity of the pressure release valve 7 and close the port J of the pressure release valve 7;
s3: the pressure regulating valve 6 increases damping, the valve core of the electromagnetic directional valve 4 is offset, the valve core of the hydraulic directional valve 5 is offset under the liquid supply pressure of the electromagnetic directional valve 4, the power pump 81 drives the driving piston 31 of the reciprocating plunger pump 3 to move, and the output piston 32 outputs the oil pressure of the oil storage tank 11 to the oil conveying pipe 12;
s4: the pressure detection module 83 detects a pressure parameter of the hydraulic pipeline;
s5: the controller judges whether the pressure parameter of the hydraulic pipeline is normal, if the pressure parameter is normal, the detection is repeated after preset time, if the pressure parameter is abnormal, the on-off valve 82 is opened to release the pressure through the pressure release valve 7, the output power of the power pump 81 is reduced, then the on-off valve 82 is closed, and the detection is repeated to judge whether the pressure parameter of the hydraulic pipeline is normal.
After the on-off valve 82 is opened and the pressure is relieved by the pressure relief valve 7, in order to ensure that the whole hydraulic system stably reduces the pressure, the system pre-judges the time T required by the uniform speed reduction of the power pump 81 and closes the on-off valve 82 at the moment of T-delta T, and the aim is to close the on-off valve 82 in advance before the uniform speed reduction of the power pump 81 reaches the preset speed, so that the pressure is accumulated in the front back cavity by the pressure relief valve, when the power pump 81 reaches the preset speed, the pressure relief valve simultaneously closes the J port, the pressure detection module 83 starts to work normally again, and the pressure in the hydraulic system cannot oscillate repeatedly due to the speed switching.
As will be appreciated by those skilled in the art, oil transportation is a long span process, both in time and space, and during oil pipeline transportation, multiple sets of pumping devices for transporting crude oil as described in the present embodiment may be provided.
The plurality of pumping devices for conveying crude oil are in communication connection with the cloud end through the controller to form a data network and share operation parameters, when the condition that pressure relief and speed reduction occur in sequence on N continuous pumping devices for conveying crude oil, the conveyed petroleum medium is judged to be suitable for new pumping parameters, the cloud end collects data of the N continuous pumping devices for conveying crude oil, and power pump parameters of the pumping devices for conveying crude oil on the downstream of the cloud end are adjusted after correction processing.
If any pumping device for conveying crude oil is decompressed and the power pump is decelerated, and the pumping devices for conveying crude oil are normally operated by power of the upstream and the downstream, the cloud end judges that the hydraulic pipeline of the pumping device for conveying crude oil is in fault, and sends an alarm signal to the terminal.
Further, the power pump 81 includes a motor and a first speed control device and a second speed control device for controlling the speed of the motor, wherein the first speed control device includes a first control unit, and the second speed control device includes a second control unit.
It can be understood by those skilled in the art that the motor of the power pump 81 has two control circuit boards, the first speed control device and the second speed control device are detachably and respectively arranged on the two control circuit boards, and in the process of pumping crude oil, the controller of the pumping device for conveying crude oil sends a control signal for controlling the rotating speed of the motor of the power pump 81 to either the first speed control device or the second speed control device so as to control the rotation of the motor.
The first speed control device and the second speed control device are both in communication connection with the motor, and the communication connection refers to sending a control signal line to control the rotating speed and the rotating direction of the motor, and in addition, the first speed control device and the second speed control device can also be used as a monitor to monitor the actual working parameters of the motor, and the controller is used for determining the actual rotating state of the motor and judging whether the rotating state of the motor is abnormal or not, for example, the controller judges whether the rotating state of the motor is abnormal or not according to the comparison of the rotating parameters of the motor and the preset rotating state.
When the controller determines that the rotation state of the motor is abnormal in the judgment, any one of the first speed control device and the second speed control device can be selected as a driving unit to re-drive the motor according to the actual situation, a signal is sent to the mobile terminal by the controller to prompt an operator to replace the previous speed control device, after replacement, the new speed control device is used as a monitor to be added into the control of pumping operation again to monitor the actual working parameters of the motor, and the controller judges whether the rotation state of the motor is abnormal or not.
Furthermore, there is a new problem that after a new speed controller is replaced, the controller cannot be installed with a device due to the update of the device software, which requires the program of the controller to be upgraded in a covering manner. Therefore, the following controller upgrading mode is further proposed.
The speed control device comprises a first storage area for storing upgrading information, the controller comprises a processor, a guide area and a second storage area, when the controller runs an application program stored in the application program storage area corresponding to the speed control device, the controller actively detects the first storage area in which the upgrading information is stored in the speed control device, and acquires the upgrading information from the speed control device, or the processor of the speed control device reads the upgrading information in the first storage area and sends the upgrading information to the controller. When the controller acquires the upgrading information, after the upgrading information is written into the second storage area, the processor of the controller runs the bootstrap program of the bootstrap area, calls the upgrading information in the second storage area, and covers the original program information stored in the second storage area.
Preferably, the obtaining upgrade information from the first storage area of the speed control device, and writing the upgrade information into the second storage area of the controller includes: the controller sends a plurality of data packet request signals to the speed control device, and after each data packet request signal is sent, one data packet of the upgrading information which is sent by the speed control device and corresponds to the data packet request signal is obtained from the speed control device. If the controller detects that the sequence number of the data packet of the latest acquired upgrading information is not continuous with the sequence number of the previous data packet, a retransmission signal is sent to the speed control device so that the speed control device starts to retransmit the data packet with the continuous sequence number with the sequence number of the previous data packet. Therefore, the writing failure caused by accidents when the internal controller writes data into the second storage area is prevented, and the original program is called and covered after the upgrading information is completely written into the second storage area. The controller damage caused by accidents due to the fact that the original program is directly covered after the speed control device obtains the upgrading information is avoided.
Accordingly, a method for pumping for transporting crude oil is proposed, which uses the aforementioned pumping device for transporting crude oil, comprising in particular:
s1: opening the on-off valve 82, and enabling the power pump 81 to work to enable a hydraulic medium to be filled between the back cavity of the pressure release valve 7 and the on-off valve 82; closing the on-off valve 82, and continuing to work by the power pump 81 to accumulate pressure in the back cavity of the pressure release valve 7 and close the port J of the pressure release valve 7; the calibration is carried out when the system is started, the valve core of the pressure relief valve is ensured to be in the correct position, and the pressure relief pipeline is ensured to be stably filled with pressure medium.
S2: the power pump 81 continues to work, the pressure regulating valve 6 increases damping, the valve core of the electromagnetic directional valve 4 is offset, the valve core of the hydraulic directional valve 5 is offset under the liquid supply pressure of the electromagnetic directional valve 4, the power pump 81 drives the driving piston 31 of the reciprocating plunger pump 3 to reciprocate, and the output piston 32 outputs the oil in the oil storage tank 11 and the pressure to the oil conveying pipe 12.
S3: the pressure detection module 83 detects a hydraulic line pressure parameter.
S4: the controller judges whether the pressure parameter of the hydraulic pipeline is normal, if so, the S3 is repeatedly executed; if not, the pressure parameter is above the threshold and S5 is performed.
S5, opening the on-off valve 82 to relieve pressure through the pressure relief valve 7, reducing the rotating speed of the power pump 81, pre-judging the time T required by the speed reduction of the power pump 81 by the controller, closing the on-off valve 82 in advance at the moment T-delta T, enabling the pressure relief valve to accumulate pressure to a back cavity in advance by the delta T time, stably running at the current speed after the speed reduction of the power pump at the moment T, and simultaneously closing a port J by the pressure relief valve, wherein the delta T is the preset advance time; after the power pump is slowed down, its torque output increases, so the total power is substantially uniform, or the crude oil transfer will be highly loaded.
S6: the controller judges whether the pressure parameter of the hydraulic pipeline is normal again, if so, the S3 is executed repeatedly; if not, the pressure parameter is higher than the preset value, and S7 is executed; if the pressure is abnormal, the driving pump needs to be detected because the power pump may be abnormally operated.
S7, the controller judges whether the first speed control device of the motor of the power pump 81 normally operates through monitoring and feeding back data by the second speed control device, if so, the step S3 is repeatedly executed after preset time, and if not, the step S8 is executed;
s8: the operator replaces the first speed control device and switches the second speed control device to control the motor of the power pump 81;
s9: the controller judges whether the version information of the first speed control device is consistent with the program information in the controller, if so, the S3 is repeatedly executed after the preset time; if not, go to S10;
s10: when the controller runs the application program stored in the application program storage area corresponding to the speed control device, the controller actively detects a first storage area in which the upgrading information is stored in the speed control device, acquires the upgrading information from the speed control device and writes the upgrading information into a second storage area of the controller, and then a processor of the controller runs the bootstrap program of the bootstrap area, calls the upgrading information in the second storage area, covers the original program information corresponding to the original speed control device stored in the second storage area, and then repeatedly executes S3 or ends after a preset time.
The pumping devices for conveying crude oil are multiple and are connected in sequence; the controllers of the pumping devices for conveying the crude oil are in communication connection with the cloud end to form a data network and share operation parameters, when the pressure relief and speed reduction conditions sequentially occur in N continuous pumping devices for conveying the crude oil, the conveyed petroleum medium is judged to be suitable for new pumping parameters, the cloud end collects data of the N continuous pumping devices for conveying the crude oil, and power pump parameters of the pumping devices for conveying the crude oil at the downstream are adjusted after correction; if any pumping device for conveying crude oil is decompressed and the power pump is decelerated, and the pumping devices for conveying crude oil on the upstream and the downstream work normally, the cloud end judges that the hydraulic pipeline of the pumping device for conveying crude oil is in fault, and sends an alarm signal to the terminal.
In step S10, obtaining upgrade information from the first storage area of the speed control device, writing the upgrade information into the second storage area of the controller includes: the controller sends a plurality of data packet request signals to the speed control device, and after each data packet request signal is sent, one data packet of the upgrading information which is sent by the speed control device and corresponds to the data packet request signal is obtained from the speed control device. If the controller detects that the sequence number of the data packet of the latest acquired upgrading information is not continuous with the sequence number of the previous data packet, a retransmission signal is sent to the speed control device so that the speed control device starts to retransmit the data packet with the continuous sequence number with the sequence number of the previous data packet.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (7)
1. A pumping device for transporting crude oil, comprising an oil storage tank (11), a reciprocating plunger pump (3) and an oil transport pipe (12), characterized in that:
the reciprocating plunger pump (3) comprises a driving side and an output side, wherein a driving piston (31) is arranged on the driving side, a left driving cavity (33) is arranged on the rodless side of the driving piston (31), a right driving cavity (34) is arranged on the rod side of the driving piston (31), an output piston (32) is arranged on the output side, a left output cavity (35) is arranged on the rod side of the output piston (32), a right output cavity (36) is arranged on the rodless side of the output piston (32), the driving piston (31) and the output piston (32) are connected into a whole through a piston rod (37), and the output piston (32) slides in a cavity on the output side under the driving of the driving piston (31);
the first oil outlet branch comprises a first one-way valve (21), a port A1, a left output cavity (35), a port A2, a third one-way valve (23) and an oil delivery pipe (12) which are connected in sequence; the first check valve (21) and the third check valve (23) are communicated to the petroleum conveying pipe (12) in a one-way mode;
the second oil outlet branch comprises a second one-way valve (22), a port B1, a right output cavity (36), a port B2, a fourth one-way valve (24) and an oil delivery pipe (12) which are connected in sequence; the second check valve (22) and the fourth check valve (24) are communicated to the petroleum conveying pipe (12) in a one-way mode;
the first oil outlet branch and the second oil outlet branch are connected in parallel and are arranged between the oil storage tank (11) and the oil delivery pipe (12);
the electromagnetic reversing valve is a three-position four-way valve and is provided with a left electromagnetic coil and a right electromagnetic coil, a valve core is normally positioned at a middle position by a left spring and a right spring, and is driven by the left electromagnetic coil or the right electromagnetic coil to deflect to a first position or a second position, the middle position is normally positioned, a port F is cut off, and a port G is simultaneously communicated with a port H and a port I; in the first position, port F is in communication with port I and port H is in communication with port G; in the second position, port F is in communication with port H and port G is in communication with port I;
a hydraulic directional control valve (5) which is a three-position four-way valve, the valve core of which is normally positioned at a middle position by a left spring and a right spring and is driven by a right hydraulic chamber or a left hydraulic chamber to bias to a left position or a right position, when the middle position is adopted, a port P is communicated with a port T, the port C2 is cut off from the port D2, when the middle position is adopted, the port P is communicated with a port C2, the port T is communicated with a port D2, when the right position is adopted, the port P is communicated with a port D2, and the port C2 is communicated with the port T;
the oil return groove (9) is communicated with a port P of a hydraulic reversing valve (5) through a power pump (81) and a pressure detection module (83), a port T of the hydraulic reversing valve (5) is communicated with the oil return groove (9) through a pressure regulating valve (6), a port F of an electromagnetic reversing valve (4) is connected with the port E1 between the port T and the pressure regulating valve (6), a port G of the electromagnetic reversing valve (4) is connected with the port E2 between the pressure regulating valve (6) and the oil return groove (9), a port H of the electromagnetic reversing valve (4) is connected with a left hydraulic cavity of the hydraulic reversing valve, and a port I of the electromagnetic reversing valve (4) is connected with a right hydraulic cavity of the hydraulic reversing valve (5); a port C2 of the hydraulic reversing valve (5) is sequentially connected with a port C1 and a left driving cavity (33) of the reciprocating plunger pump (3), and a port D2 of the hydraulic reversing valve (5) is sequentially connected with a port D1 and a right driving cavity (34) of the reciprocating plunger pump (3);
the pressure regulating valve (6) is capable of providing a change in the magnitude of the fluid damping in the conduit.
2. Pumping unit for transporting crude oil according to claim 1, characterized in that: the pressure relief valve further comprises a pressure relief valve (7), the pressure relief valve (7) is connected with the pressure detection module (83) in parallel, a conical valve core is arranged in a valve cavity of the pressure relief valve (7), the conical valve core divides the valve cavity into a top cavity and a back cavity, the conical valve core is provided with a top surface (71) and a back surface (75), the area of the top surface is smaller than that of the back surface, the top surface (71) is surrounded by an inclined ring surface (72), a through hole (73) is formed between the inclined ring surface (72) and the back surface (75), the top cavity is communicated with the back cavity through the through hole (73), a back pressure spring (74) is arranged between the back surface (75) and the inner wall of the valve cavity, the back pressure spring (74) loads the conical valve core on a port J and seals the port J under a normal state, when the back cavity is relieved to the oil return groove (9) through the on-off valve (82), the power pump (81) pushes the conical valve core to the back cavity, the power pump (81) stores pressure through the through hole (73) and finally enables the cone-shaped valve core to be reloaded on the port J and closes the port J; the port J of the top cavity is connected with the port P through a fifth one-way valve (76), the fifth one-way valve (76) conducts to the port P in a one-way mode, the port K of the top cavity is connected with a power pump (81), and the port L of the back cavity is connected with an oil return groove (9) through an on-off valve (82).
3. Pumping unit for transporting crude oil according to claim 2, characterized in that: the device also comprises a controller, the controller is in control electric connection with the electromagnetic directional valve (4), the pressure regulating valve (6), the pressure relief valve (7), the power pump (81) and the on-off valve (82), the position of a valve cavity of the driving piston (31) on the driving side can be detected, the controller is in communication with the cloud, the power pump (81) comprises a motor, a first speed control device used for controlling the speed of the motor and a second speed control device used for monitoring the state of the motor, the first speed control device comprises a first control unit, the second speed control device comprises a second control unit, when the controller determines that the rotating state of the motor is abnormal in judgment, the controller can stop the work of the first speed control device and convert the state of the motor monitored by the second speed control device into the speed of the motor for driving the motor again, and sends a signal to the mobile terminal to prompt an operator to replace the first speed control device, and then the first speed control device is used as a monitor to monitor the state of the motor again, and the controller judges whether the rotation state of the motor is abnormal or not.
4. Pumping unit for transporting crude oil according to claim 3, characterized in that: the first speed control device and the second speed control device are identical in structure and respectively comprise a first storage area for storing upgrading information, the controller comprises a processor, a guide area and a second storage area, when the controller runs an application program stored in the application program storage area corresponding to the first speed control device or the second speed control device, the controller actively detects the first storage area in which the upgrading information is stored in the first speed control device or the second speed control device, acquires the upgrading information from the first speed control device or the second speed control device and writes the upgrading information into the second storage area, the processor of the controller runs the guide program of the guide area, calls the upgrading information in the second storage area and covers the original program information corresponding to the original speed control device stored in the second storage area.
5. A method for pumping for transporting crude oil using the pumping device for transporting crude oil according to claim 4, characterized in that:
s1: opening the on-off valve (82), and enabling the power pump (81) to work to enable a hydraulic medium to be filled between the back cavity of the pressure release valve (7) and the on-off valve (82); closing the on-off valve (82), and continuing to work by the power pump (81), so that the back cavity of the pressure release valve (7) accumulates pressure and the port J of the pressure release valve (7) is closed;
s2: the power pump (81) continues to work, the pressure regulating valve (6) increases damping, the valve core of the electromagnetic directional valve (4) is biased, the valve core of the hydraulic directional valve (5) is biased under the liquid supply pressure of the electromagnetic directional valve (4), the power pump (81) drives the driving piston (31) of the reciprocating plunger pump (3) to reciprocate, and the output piston (32) outputs the oil in the oil storage tank (11) and the pressure to the oil conveying pipe (12);
s3: the pressure detection module (83) detects a pressure parameter of the hydraulic pipeline;
s4: the controller judges whether the pressure parameter of the hydraulic pipeline is normal, if so, the S3 is repeatedly executed; if not, the pressure parameter is higher than the threshold value, S5 is executed;
s5, opening the on-off valve (82) to release pressure through a pressure release valve (7), reducing the rotating speed of the power pump (81), pre-judging the time T required by the speed reduction of the power pump (81) by the controller, closing the on-off valve (82) at the moment T-delta T, enabling the pressure release valve to accumulate pressure to the back cavity in advance of delta T time, stably running at the current speed after the speed reduction of the power pump at the moment T, and simultaneously closing a port J by the pressure release valve, wherein the delta T is the preset advance time;
s6: the controller judges whether the pressure parameter of the hydraulic pipeline is normal again, if so, the S3 is executed repeatedly; if not, the pressure parameter is higher than the preset value, and S7 is executed;
s7, the controller judges whether the first speed control device of the motor of the power pump (81) operates normally through monitoring and feeding back data by the second speed control device, if so, the S3 is repeatedly executed after preset time, and if not, the S8 is executed;
s8: the operator replaces the first speed control device and switches the second speed control device to control the motor of the power pump (81);
s9: the controller judges whether the version information of the first speed control device is consistent with the program information in the controller, if so, the S3 is repeatedly executed after the preset time; if not, go to S10;
s10: when the controller runs the application program stored in the application program storage area corresponding to the speed control device, the controller actively detects a first storage area in which the upgrading information is stored in the speed control device, acquires the upgrading information from the speed control device and writes the upgrading information into a second storage area of the controller, and then a processor of the controller runs the bootstrap program of the bootstrap area, calls the upgrading information in the second storage area, covers the original program information corresponding to the original speed control device stored in the second storage area, and then repeatedly executes S3 or ends after a preset time.
6. The method of pumping for transporting crude oil according to claim 5, characterized in that: the pumping devices for conveying crude oil are multiple and are connected in sequence; the controllers of the pumping devices for conveying the crude oil are in communication connection with the cloud end to form a data network and share operation parameters, when the pressure relief and speed reduction conditions sequentially occur in N continuous pumping devices for conveying the crude oil, the conveyed petroleum medium is judged to be suitable for new pumping parameters, the cloud end collects data of the N continuous pumping devices for conveying the crude oil, and power pump parameters of the pumping devices for conveying the crude oil at the downstream are adjusted after correction; if any pumping device for conveying crude oil is decompressed and the power pump is decelerated, and the pumping devices for conveying crude oil on the upstream and the downstream work normally, the cloud end judges that the hydraulic pipeline of the pumping device for conveying crude oil is in fault, and sends an alarm signal to the terminal.
7. The method of pumping for transporting crude oil according to claim 5, characterized in that: in step S10, obtaining upgrade information from the first storage area of the speed control device, writing the upgrade information into the second storage area of the controller includes: the controller sends a plurality of data packet request signals to the speed control device, after each data packet request signal is sent, one data packet of the upgrading information corresponding to the data packet request signal sent by the controller is obtained from the speed control device, if the controller detects that the sequence number of the data packet of the upgrading information obtained last time is not continuous with the sequence number of the previous data packet, a retransmission signal is sent to the speed control device so that the speed control device starts to retransmit the data packet with the continuous sequence number with the sequence number of the previous data packet.
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| CN201910216485.0A CN109915336B (en) | 2019-03-21 | 2019-03-21 | Pumping device for conveying crude oil |
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| CN201910216485.0A CN109915336B (en) | 2019-03-21 | 2019-03-21 | Pumping device for conveying crude oil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS61233203A (en) * | 1985-04-03 | 1986-10-17 | Iseki & Co Ltd | Hydraulic device |
| CN2751106Y (en) * | 2004-11-12 | 2006-01-11 | 郑州知信机电科技开发有限公司 | Proportional control high-pressure double liquid injection pump |
| CN201103527Y (en) * | 2007-09-28 | 2008-08-20 | 西安昆仑液压传动机械厂 | Capacity type hydraulic driving reciprocating compressor |
| CN201818491U (en) * | 2010-09-19 | 2011-05-04 | 长沙中联重工科技发展股份有限公司 | Piston lubrication system of concrete cylinder |
| CN108644088B (en) * | 2018-05-18 | 2019-12-17 | 江苏盐邦泵业制造有限公司 | Hydraulic slurry pump |
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