Smooth pulsation device of reciprocating pump and intelligent control method

Abstract

The invention relates to the technical field of pump bodies, in particular to a smooth pulsation device of a reciprocating pump, which comprises pump bodies, a plurality of groups of material output ports are arranged on one side of each pump body, a pump main shaft is rotatably connected in each pump body, the smooth pulsation device comprises an automatic control module, and the automatic control module is used for comparing the phase difference of the two pump bodies. The rotating speed is adjusted to enable the output of one set of pump bodies to be always kept at a peak value corresponding to the output peak valley of the other set of pump bodies, vibration of a pipeline system is reduced, the states of the pump bodies are adjusted according to conveying requirements, low-pressure small-flow liquid conveying is facilitated, high-pressure large-flow liquid conveying can be achieved, the phase difference of the two pump bodies can be compared, and the working efficiency is improved. Signals are fed back to the synchronous control cabinet to adjust the rotating speed, vibration of a pipeline system is reduced, and pulsation tends to be stable.

Description

Technical Field

[0001] The present invention relates to the technical field of pump bodies, and in particular to a stable pulsation device and an intelligent control method for a reciprocating pump. Background Art

[0002] Reciprocating pumps are mainly divided into several types such as piston pumps, plunger pumps, diaphragm pumps, and metering pumps. They are suitable for conveying various mediums with small flow and high pressure. In particular, diaphragm pumps and diaphragm metering pumps are very suitable for conveying highly corrosive, flammable, explosive, toxic and harmful dangerous media due to their zero leakage characteristics. Therefore, they are widely used. With the continuous development of the chemical, pharmaceutical and fragrance industries, the market demand for isooctene as an important organic synthesis raw material has also increased. The transportation of high-pressure and high-flow isooctene is a major challenge. Low-pressure and low-flow conveying equipment is common in the market, but high-pressure and high-flow pumps are basically blank in China. The few introduced ones are also dependent on imports, which have the disadvantages of high cost, long delivery cycle, and uncontrolled transportation conditions.

[0003] The flow / pressure pulsation problem of existing reciprocating pumps has always troubled the majority of users and designers, mainly manifested in uneven delivery flow, flow deviation of metering pumps, excessive vibration of the unit caused by pressure pulsation, poor suction performance of the unit and other problems. Existing research reports show that the flow pulsation of the reciprocating pump is caused by the reciprocating motion of the plunger driven by the eccentric mechanism, and the inlet and outlet pressure pulsation of the reciprocating pump is formed by the superposition of acceleration head loss and local / along-the-way resistance loss in the inlet and outlet pipelines. Therefore, it is necessary to accurately detect the phase and flow of multiple pump main shafts. Balancing the phase difference and flow of multiple pumps is the key to solving the pulsation problem.

[0004] Therefore, a stable pulsation device and an intelligent control method for a reciprocating pump are proposed. Summary of the invention

[0005] The object of the present invention is to provide a stable pulsation device and an intelligent control method for a reciprocating pump, so as to solve the problems of poor pulsation stability and inconvenience in high-pressure and large-flow delivery mentioned in the above-mentioned background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a stable pulsation device for a reciprocating pump, comprising a pump body, a plurality of material output ports are arranged on one side of the pump body, a pump main shaft is rotatably connected inside the pump body, and the stable pulsation device comprises an automatic control module, the automatic control module is used to compare the phase difference between two pump bodies, adjust the rotation speed so that the output of one group of pump bodies always maintains a peak value, corresponding to the peak and valley of the output of the other group of pump bodies, and reduce the vibration of the pipeline system; The automatic control module includes a VFD inverter whose motor start and stop signals of the pump body are connected by the on-site operating column. The VFD inverter is connected to the emergency stop signal configured by the DCS controller. The DCS controller panel is equipped with a switch for synchronous and asynchronous control modes. The DCS controller transmits the synchronous and asynchronous signals to the two VFD inverters and the synchronous control cabinet respectively.

[0007] Preferably, the VFD inverter is provided with a start-stop self-locking circuit, and the VFD inverter is provided with a single-channel start-stop and dual-channel speed regulation configuration.

[0008] Preferably, the speed of the pump body is controlled by a 4-20mA speed control signal of a VFD inverter, the VFD inverter and the synchronous control cabinet are provided with AI1, the VFD inverter is provided with AI2, AI1 receives a 4-20mA speed control signal from a DCS controller, and AI2 receives a 4-20mA speed control signal from a synchronous control cabinet.

[0009] Preferably, DI1 and DI3 are provided in the VFD inverter. No matter in synchronous or asynchronous state, as long as DI1 is at a high level, the VFD inverter starts.

[0010] Preferably, DI3 is used for synchronous and asynchronous switching. When DI3 is at a high level, that is, synchronous mode, AI2 controls the speed of the VFD inverter. When DI3 is at a low level, that is, asynchronous mode, AI1 controls the speed of the VFD inverter.

[0011] Preferably, the range of the speed regulation signals of the two pump bodies in the synchronous mode set by the DCS controller panel is 0-50%, and the range of the speed regulation signals of the two pump bodies in the asynchronous mode set by the DCS controller panel is 0-100%.

[0012] Preferably, the sensor module includes an encoder adapter fixedly installed on one end of the pump main shaft by screws, the outer side of the encoder adapter is rotatably connected to the encoder, a connecting plate is fixedly installed on the side of the encoder close to the encoder adapter, the connecting plate is fixedly connected to one end of the crank arm by bolts, the other end of the crank arm is fixedly connected to the bracket by bolts, and the bracket is fixedly installed on the pump body.

[0013] Preferably, a phase sensor sensing rod is provided on the outside of the encoder adapter, the phase sensor sensing rod is provided inside the sensor outer cover, the sensor outer cover is fixedly mounted on the pump body, the phase sensor is fixedly mounted on the inner wall of the sensor outer cover by means of a fastening nut and a conical gasket, and a sensor adapter is provided on the outside of the sensor outer cover, the sensor adapter passes through the sensor outer cover and is fixedly connected with the phase sensor.

[0014] An intelligent control method for a stable pulsation device of a reciprocating pump comprises the following steps; S1. When the pump body delivers low-pressure and low-flow liquid, the DCS controller selects the asynchronous mode, so that DI3 in the VFD inverter is at a low level. The DCS controller panel sets the speed control signals of the two pumps to 0%-100%. The speed of the pump body is controlled by the 4-20mA speed control signal directly output by the DCS controller to the VFD inverter. However, when the two pump bodies are started at the same time, they will not operate in a synchronous state. S2. When the pump delivers high-pressure and high-flow liquid, select the synchronous mode on the DCS controller, make DI3 in the VFD inverter high, and the pump transmits information to the synchronous control cabinet through the encoder. The DCS controller should first output a 4-20mA flow setting signal to the synchronous control cabinet. The speed signal received by the VFD inverter comes from the 4-20mA signal of the synchronous control cabinet. When only one pump is turned on, the speed control signal should not be greater than 50%; S3. Select the synchronous mode on the DCS controller. When the two pumps are started at the same time, the two pumps will automatically operate in a synchronous state. The DCS controller can only output a flow signal within the range of 0%-100%, and the synchronous control cabinet will automatically distribute it evenly to the two VFD inverters.

[0015] Beneficial effects of the present invention: 1. The present invention adjusts the state of the pump body according to the delivery demand by designing an automatic control module, which is convenient for delivering low-pressure and small-flow liquids, and can also achieve high-pressure and large-flow liquid delivery. The phase difference between the two pump bodies can be compared, and the feedback signal can be given to the synchronous control cabinet to adjust the speed, so that the peak value of one group of pump body outputs always corresponds to the peak and valley of the other group of pump body outputs, thereby reducing the vibration of the pipeline system and stabilizing the pulsation.

[0016] 2. The present invention designs a sensor module and uses a crank arm to fix the encoder on the pump body, which effectively buffers the impact of the axial movement of the pump main shaft on the encoder bearing, prevents the encoder from being subjected to abnormal force, ensures the stability of the encoder output signal, and facilitates the encoder to be connected to the pump main shaft through the encoder adapter, so as to monitor the operating status of the pump body in real time, ensure accurate control of the flow rate and speed, achieve efficient and stable operation management of the pump body, and improve the overall performance. The phase sensor is fixed by the sensor cover, so that the phase sensor can detect the speed of the pump main shaft more stably, which is convenient for adjusting the speed for precise control. This intelligent control method improves production efficiency, reduces energy waste, and also improves safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a technical route of a stable pulsation device and an intelligent control method for a reciprocating pump according to an embodiment of the present invention; Figure 2 It is an overall schematic diagram of a pump body of a stable pulsation device and an intelligent control method for a reciprocating pump according to an embodiment of the present invention; Figure 3 A stable pulsation device and intelligent control method for a reciprocating pump according to an embodiment of the present invention Figure 2 The enlarged schematic diagram at A in the middle; Figure 4 A schematic diagram of the installation of a phase sensor for a stable pulsation device and an intelligent control method for a reciprocating pump according to an embodiment of the present invention; Figure 5 A schematic diagram of an encoder component of a stable pulsation device and an intelligent control method for a reciprocating pump according to an embodiment of the present invention; Figure 6 A schematic diagram of a phase sensor assembly of a stable pulsation device and an intelligent control method for a reciprocating pump according to an embodiment of the present invention; Figure 7 A stable pulsation device and intelligent control method for a reciprocating pump according to an embodiment of the present invention Figure 6 Schematic diagram of the cross section at BB in the middle.

[0019] The markings in the figure are: 1. Pump body; 2. VFD inverter; 3. Synchronous control cabinet; 4. DCS controller; 5. Material output port; 6. Pump main shaft; 7. Encoder adapter; 8. Encoder; 9. Connecting plate; 10. Crank arm; 11. Bracket; 12. Sensor cover; 13. Phase sensor sensing rod; 14. Phase sensor; 15. Fastening nut; 16. Conical gasket; 17. Sensor adapter. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0021] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] See also Figures 1 to 7 The present invention provides a technical solution: a smooth pulsation device for a reciprocating pump, comprising a pump body 1, a plurality of material output ports 5 are arranged on one side of the pump body 1, a pump main shaft 6 is rotatably connected inside the pump body 1, the smooth pulsation device comprises an automatic control module, the automatic control module is used to compare the phase difference between the two pump bodies 1, and adjust the rotation speed so that the output of one group of pump bodies 1 always maintains a peak value, corresponding to the peak and valley of the output of the other group of pump bodies 1, thereby reducing the vibration of the pipeline system, the smooth pulsation device also comprises a sensor module, the sensor module can stably install the encoder 8 and the phase sensor 14 on the pump body 1, so that the encoder 8 and the phase sensor 14 can function, monitor the running status of the pump in real time, accurately control the flow rate and the rotation speed, provide accurate position data, and help the automatic control module to achieve efficient and stable operation management of the pump body 1.

[0023] As an embodiment of the present invention, Figure 1 and Figure 2 as well as Figure 3As shown, the automatic control module includes a VFD inverter 2 whose motor start and stop signals of the pump body 1 are connected by a field operation column, and the VFD inverter 2 is connected to an emergency stop signal configured by a DCS controller 4. A switch for switching between synchronous and asynchronous control modes is provided on the panel of the DCS controller 4. The DCS controller 4 transmits the synchronous and asynchronous signals to two VFD inverters 2 and a synchronous control cabinet 3 respectively. The VFD inverter 2 is provided with a start and stop self-locking circuit, and the VFD inverter 2 is provided with a single-channel start and stop and a dual-channel speed regulation configuration. The speed of the pump body 1 is controlled by a 4-20mA speed regulation signal of the VFD inverter 2. The VFD inverter 2 and the synchronous control cabinet 3 are provided with There is AI1, and VFD inverter 2 is equipped with AI2. AI1 receives 4-20mA speed regulation signal from DCS controller 4, and AI2 receives 4-20mA speed regulation signal from synchronous control cabinet 3. VFD inverter 2 is equipped with DI1 and DI3. Regardless of synchronous or asynchronous state, as long as DI1 is high, VFD inverter 2 starts. DI3 is used for synchronous and asynchronous switching. When DI3 is high, that is, synchronous mode, AI2 controls the speed of VFD inverter 2. When DI3 is low, that is, asynchronous mode, AI1 controls the speed of VFD inverter 2. When pump body 1 delivers low-pressure and small-flow liquid, in D CS controller 4 selects non-synchronous mode, making DI3 in VFD inverter 2 low level, and the on-site operation column controls the start and stop of one pump body 1 or two pump bodies 1 at the same time. At this time, the speed of the started pump body 1 or two pump bodies 1 is controlled by the 4-20mA speed control signal directly output by DCS controller 4 to VFD inverter 2. However, when two pump bodies 1 are started at the same time, they will not operate in a synchronous state. When pump body 1 delivers high-pressure and large-flow liquid, synchronous mode is selected on DCS controller 4, making DI3 in VFD inverter 2 high level, pump body 1 transmits information to synchronous control cabinet 3 through encoder, and the start and stop are still controlled by the on-site operation column. One pump body 1 or two pump bodies 1 are started and stopped at the same time. At this time, the speed signal received by the VFD inverter 2 comes from the 4-20mA signal of the synchronous control cabinet 3, but the DCS controller 4 must first output a 4-20mA flow setting signal to the synchronous control cabinet 3. When the two pump bodies 1 are started at the same time, the two pump bodies 1 automatically operate in a synchronous state. The DCS controller 4 can only output a flow signal within the range of 0%-100%, and the synchronous control cabinet 3 automatically distributes it evenly to the two VFD inverters 2, which is conducive to adjusting the state of the pump body 1 according to the transportation demand, which is convenient for the transportation of low-pressure and small-flow liquids, and can also realize high-pressure and large-flow liquid transportation.

[0024] As an embodiment of the present invention, Figure 1 and Figure 2 as well as Figure 7As shown, the DCS controller 4 panel sets the speed control signal range of the two pump bodies 1 in the synchronous mode to be 0-50%, and the DCS controller 4 panel sets the speed control signal range of the two pump bodies 1 in the asynchronous mode to be 0-100%. When the synchronous mode is selected on the DCS controller 4, the start and stop signal of the pump body 1 is sent to the VFD inverter 2 by the on-site operating column. The DCS controller 4 panel can only set a speed control signal with a range of 0%-100%. Because the two pump bodies 1 are running at the same time and both are at the maximum speed, the corresponding speed control signal of the DCS controller 4 is 100%. Therefore, when only one pump body 1 is turned on, the speed control signal should not be greater than 50%, and the synchronous control cabinet 3 is in accordance with the DCS controller 4 panel. The set speed control signal starts the VFD inverter 2 of the corresponding pump body 1. There is no need for synchronous control when starting a single pump body 1. If two pump bodies 1 are started at the same time, the synchronous control cabinet 3 automatically starts synchronous control. Then, when the asynchronous mode is selected on the DCS controller 4, the DCS controller 4 panel sets the speed control signals of the two pumps to 0%-100% respectively. The inverter cabinet starts the VFD inverter 2 of the corresponding pump body 1 according to the speed control signal set on the DCS controller 4 panel, which is conducive to comparing the phase difference between the two pump bodies 1, and feeding back the signal to the control unit to adjust the speed, so that the peak value of one group of pump bodies 1 outputs always corresponds to the peak and valley of the other group of pump bodies 1 outputs, reducing the vibration of the pipeline system and making the pulsation stable.

[0025] As an embodiment of the present invention, Figure 4 and Figure 5 as well as Figure 6As shown, the sensor module includes an encoder adapter 7 fixedly installed at one end of the pump main shaft 6 by screws, an encoder 8 is rotatably connected to the outer side of the encoder adapter 7, a connecting plate 9 is fixedly installed on the side of the encoder 8 close to the encoder adapter 7, the connecting plate 9 is fixedly connected to one end of a crank arm 10 by bolts, the other end of the crank arm 10 is fixedly connected to a bracket 11 by bolts, the bracket 11 is fixedly installed on the pump body 1, a phase sensor sensing rod 13 is arranged on the outer side of the encoder adapter 7, the phase sensor sensing rod 13 is arranged inside a sensor outer cover 12, the sensor outer cover 12 is fixedly installed on the pump body 1, a phase sensor 14 is fixedly installed on the inner wall of the sensor outer cover 12 by a fastening nut 15 and a conical gasket 16, a sensor adapter 17 is arranged on the outer side of the sensor outer cover 12, the sensor adapter 17 penetrates the sensor outer cover 12 and is fixedly connected to the phase sensor 14, the encoder 8 is fixedly installed on the pump body 1 by the connecting plate 9, the crank arm 10 and the bracket 11, so that the encoder 8 can be stably connected to the encoder adapter 7 Then, the sensor cover 12 is installed on the pump body 1, so that the phase sensor 14 on the sensor cover 12 is close to the phase sensor sensing rod 13 on the encoder adapter 7, so that the phase sensor 14 can accurately measure the rotation speed of the pump main shaft 6, feed back the operating phase of the pump body 1, compare the phase difference between the two pump bodies 1, and feed back the signal to the control unit, which is conducive to fixing the encoder 8 on the pump body 1 through the crank arm 10, effectively buffering the influence of the axial movement of the pump main shaft 6 on the encoder 8 bearing, so that the encoder 8 will not be abnormally stressed, and the stability of the encoder 8 output signal is guaranteed, which is convenient for the encoder 8 to be connected to the pump main shaft 6 through the encoder adapter 7, real-time monitoring of the operating status of the pump body 1, ensuring accurate control of the flow rate and speed, realizing efficient and stable operation management of the pump body 1, and improving the overall performance. The rotation speed of the pump main shaft 6 is detected by the phase sensor 14 on the inner side of the sensor cover 12, which is convenient for adjusting the speed and accurate control. This intelligent control method improves production efficiency, reduces energy waste, and also improves the safety of the system.

[0026] An intelligent control method for a stable pulsation device of a reciprocating pump comprises the following steps; S1, when pump body 1 delivers low-pressure and low-flow liquid, select the asynchronous mode in DCS controller 4, make DI3 in VFD inverter 2 low level, DCS controller 4 panel sets the speed control signals of the two pumps to 0%-100%, the speed of pump body 1 is controlled by the 4-20mA speed control signal directly output by DCS controller 4 to VFD inverter 2, but when the two pump bodies 1 are started at the same time, they will not operate in a synchronous state; S2. When pump body 1 delivers high-pressure and high-flow liquid, select the synchronous mode on DCS controller 4, make DI3 in VFD inverter 2 high level, pump body 1 transmits information to synchronous control cabinet 3 through encoder, DCS controller 4 should first output a 4-20mA flow setting signal to synchronous control cabinet 3, the speed signal received by VFD inverter 2 comes from the 4-20mA signal of synchronous control cabinet 3, and when only one pump body 1 is turned on, the speed control signal should not be greater than 50%; S3. When the synchronous mode is selected on the DCS controller 4 and the two pump bodies 1 are started at the same time, the two pump bodies 1 automatically operate in a synchronous state. The DCS controller 4 can only output a flow signal within the range of 0%-100%, and the synchronous control cabinet 3 automatically distributes it evenly to the two VFD inverters 2.

[0027] Working principle: When pump body 1 delivers low-pressure and low-flow liquid, select the asynchronous mode on DCS controller 4, make DI3 in VFD inverter 2 low level, and control one pump body 1 or two pump bodies 1 to start and stop at the same time by the on-site operation column. At this time, the speed of the started pump body 1 or two pump bodies 1 is controlled by the 4-20mA speed control signal directly output by DCS controller 4 to VFD inverter 2. However, when two pump bodies 1 are started at the same time, they will not operate in a synchronous state. When pump body 1 delivers high-pressure and high-flow liquid, select the synchronous mode on DCS controller 4, make DI3 in VFD inverter 2 high level. , the pump body 1 transmits information to the synchronous control cabinet 3 through the encoder, and the start and stop of one pump body 1 or two pump bodies 1 at the same time are still controlled by the on-site operating column. At this time, the speed signal received by the VFD inverter 2 comes from the 4-20mA signal of the synchronous control cabinet 3, but the DCS controller 4 must first output a 4-20mA flow setting signal to the synchronous control cabinet 3, and when the two pump bodies 1 are started at the same time, the two pump bodies 1 automatically operate in a synchronous state, and the DCS controller 4 can only output a flow signal within the range of 0%-100%, and the synchronous control cabinet 3 automatically distributes it evenly to the two VFD inverters 2; When the synchronous mode is selected on the DCS controller 4, the start and stop signal of the pump body 1 is sent to the VFD inverter 2 by the on-site operating column. The DCS controller 4 panel can only set a speed control signal with a range of 0%-100%. Because when the two pump bodies 1 are running at the same time and both are at the maximum speed, the corresponding speed control signal of the DCS controller 4 is 100%. Therefore, when only one pump body 1 is turned on, the speed control signal should not be greater than 50%, and the synchronous control cabinet 3 starts the VFD inverter 2 of the corresponding pump body 1 according to the speed control signal set by the DCS controller 4 panel. There is no need for synchronous control when starting a single pump body 1. If two pump bodies 1 are started at the same time, the synchronous control cabinet 3 automatically starts synchronous control. Then, when the non-synchronous mode is selected on the DCS controller 4, the DCS controller 4 panel sets the speed control signals of the two pumps to 0%-100% respectively, and the inverter cabinet starts the VFD inverter 2 of the corresponding pump body 1 according to the speed control signal set by the DCS controller 4 panel. The encoder 8 is fixedly mounted on the pump body 1 through the connecting plate 9, the crank arm 10 and the bracket 11, so that the encoder 8 can be stably connected to the encoder adapter 7, and then the sensor cover 12 is installed on the pump body 1, so that the phase sensor 14 on the sensor cover 12 is close to the phase sensor sensing rod 13 on the encoder adapter 7, so that the phase sensor 14 can accurately measure the rotation speed of the pump main shaft 6, feed back the operating phase of the pump body 1, compare the phase difference between the two pump bodies 1, and feed back the signal to the control unit.

[0028] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0029] The present invention is intended to cover all such substitutions, modifications and changes that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reciprocating pump smooth pulsation device, comprising a pump body (1), a plurality of material outlets (5) are arranged on one side of the pump body (1), a pump main shaft (6) is rotatably connected inside the pump body (1), and the characteristics are: The pulsation stabilization device comprises an automatic control module, which is used to compare the phase difference between the two pump bodies (1), adjust the rotation speed so that the output of one group of pump bodies (1) always maintains a peak value, corresponding to the peak and valley of the output of the other group of pump bodies (1), thereby reducing the vibration of the pipeline system; The automatic control module comprises a VFD inverter (2) to which the motor start and stop signals of the pump body (1) are connected via a field operation column, the VFD inverter (2) being connected to an emergency stop signal configured by a DCS controller (4), a switch for switching between synchronous and asynchronous control modes being arranged on a panel of the DCS controller (4), and the DCS controller (4) transmitting the synchronous and asynchronous signals to the two VFD inverters (2) and the synchronous control cabinet (3) respectively.

2. A reciprocating pump pulsation stabilizing device according to claim 1, characterized in that: The VFD frequency converter (2) is provided with a start-stop self-locking circuit, and the VFD frequency converter (2) is provided with a single-channel start-stop and dual-channel speed regulation configuration.

3. A reciprocating pump pulsation stabilizing device according to claim 1, characterized in that: The rotation speed of the pump body (1) is controlled by a 4-20mA speed control signal of a VFD inverter (2). The VFD inverter (2) and the synchronous control cabinet (3) are provided with AI1. The VFD inverter (2) is provided with AI2. AI1 receives a 4-20mA speed control signal from a DCS controller (4), and AI2 receives a 4-20mA speed control signal from the synchronous control cabinet (3).

4. The stable pulsation device for a reciprocating pump according to claim 1 is characterized in that: The VFD inverter (2) is provided with DI1 and DI3. Regardless of whether it is in a synchronous or asynchronous state, as long as DI1 is at a high level, the VFD inverter (2) is started.

5. A reciprocating pump pulsation stabilizing device according to claim 4, characterized in that: The DI3 is used for switching between synchronization and non-synchronization. When the DI3 is at a high level, i.e., the synchronous mode, the speed of the VFD inverter (2) is controlled by AI2. When the DI3 is at a low level, i.e., the non-synchronous mode, the speed of the VFD inverter (2) is controlled by AI1.

6. A reciprocating pump pulsation stabilizing device according to claim 1, characterized in that: In the synchronous mode set by the panel of the DCS controller (4), the range of the speed regulation signals of the two pump bodies (1) is 0-50%, and in the asynchronous mode set by the panel of the DCS controller (4), the range of the speed regulation signals of the two pump bodies (1) is 0-100%.

7. A reciprocating pump pulsation stabilizing device according to claim 1, characterized in that: The smooth pulsation device further comprises a sensor module, the sensor module comprising an encoder adapter (7) fixedly mounted on one end of a pump main shaft (6) by means of screws, an encoder (8) being rotatably connected to the outer side of the encoder adapter (7), a connecting plate (9) being fixedly mounted on a side of the encoder (8) close to the encoder adapter (7), the connecting plate (9) being fixedly connected to one end of a crank arm (10) by means of bolts, the other end of the crank arm (10) being fixedly connected to a bracket (11) by means of bolts, and the bracket (11) being fixedly mounted on the pump body (1).

8. A reciprocating pump pulsation stabilizing device according to claim 7, characterized in that: A phase sensor sensing rod (13) is arranged on the outside of the encoder adapter (7), and the phase sensor sensing rod (13) is arranged inside a sensor outer cover (12). The sensor outer cover (12) is fixedly mounted on the pump body (1), and a phase sensor (14) is fixedly mounted on the inner wall of the sensor outer cover (12) via a fastening nut (15) and a conical gasket (16). A sensor adapter (17) is arranged on the outside of the sensor outer cover (12), and the sensor adapter (17) passes through the sensor outer cover (12) and is fixedly connected to the phase sensor (14).

9. An intelligent control method for a stable pulsation device of a reciprocating pump according to any one of claims 1 to 9, characterized in that: The steps include: S1. When the pump body (1) delivers low-pressure and low-flow liquid, the DCS controller (4) selects the asynchronous mode, so that DI3 in the VFD inverter (2) is at a low level. The DCS controller (4) panel sets the speed control signals of the two pumps to 0%-100%. The speed of the pump body (1) is controlled by the 4-20mA speed control signal directly output by the DCS controller (4) to the VFD inverter (2). However, when the two pump bodies (1) are started at the same time, they will not operate in a synchronous state. S2. When the pump body (1) delivers high-pressure and high-flow liquid, the synchronous mode is selected on the DCS controller (4), so that DI3 in the VFD inverter (2) is at a high level. The pump body (1) transmits information to the synchronous control cabinet (3) through the encoder. The DCS controller (4) first outputs a 4-20mA flow setting signal to the synchronous control cabinet (3). The speed signal received by the VFD inverter (2) comes from the 4-20mA signal of the synchronous control cabinet (3). When only one pump body (1) is turned on, the speed control signal should not be greater than 50%; S3. When the synchronous mode is selected on the DCS controller (4) and the two pump bodies (1) are started at the same time, the two pump bodies (1) automatically operate in a synchronous state. The DCS controller (4) can only output a flow signal within the range of 0%-100%, and the synchronous control cabinet (3) automatically distributes it evenly to the two VFD inverters (2).

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