CN112081734B - Method and system for testing performance of double-acting plunger pump - Google Patents
Method and system for testing performance of double-acting plunger pump Download PDFInfo
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- CN112081734B CN112081734B CN202010737316.4A CN202010737316A CN112081734B CN 112081734 B CN112081734 B CN 112081734B CN 202010737316 A CN202010737316 A CN 202010737316A CN 112081734 B CN112081734 B CN 112081734B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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Abstract
The invention relates to a method and a system for testing the performance of a double-acting plunger pump, comprising the following steps: s1, setting a displacement monitoring point, and monitoring the real-time displacement of the plunger in the plunger pump in the movement process at the displacement monitoring point; s2, generating a displacement waveform of the plunger in the movement process of the plunger according to the real-time displacement amount, and marking the limit position of the plunger in the displacement waveform; s3, acquiring a first movement duration corresponding to the movement process of the plunger according to the displacement waveform, and the initial position of the plunger, the end position of the plunger and the limit position times between the initial position and the end position within the first movement duration; s4, acquiring working displacement of the plunger corresponding to the first movement duration according to the initial position, the end position and the limit position times; and S5, acquiring the cross-sectional area of the plunger to acquire the injection flow of the plunger pump according to the working displacement and the cross-sectional area. The invention has the advantages of simple process and high test precision.
Description
Technical Field
The invention relates to the technical field of plunger pump testing, in particular to a method and a system for testing the performance of a double-acting plunger pump.
Background
At present, the stroke of a plunger of a nuclear power hydraulic test pump is measured by temporarily removing a protective cover and measuring the process that a manual handheld tool approaches to the plunger of the plunger pump in operation on site. In the testing process, the running data of the plunger pump is manually recorded, and the performance index of the plunger pump is determined by inquiring a comparison table. The testing process needs 3-4 people for each work, the measuring mode is backward, and the personnel investment is large. In addition, there is a risk of equipment damage and personal injury during testing by hand. Particularly, in a nuclear power hydraulic test pump, the requirement on data measurement accuracy is high, and the manual test method is difficult to guarantee the test requirement.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a system for testing the performance of a double-acting plunger pump, aiming at some technical defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method of constructing a dual action plunger pump performance test comprising:
s1, setting a displacement monitoring point, and monitoring the real-time displacement of the plunger in the plunger pump relative to the displacement monitoring point in the movement process at the displacement monitoring point;
s2, generating a displacement waveform of the plunger in the motion process of the plunger according to the real-time displacement amount, and identifying the extreme position of the plunger in the displacement waveform;
s3, acquiring a first movement duration corresponding to the movement process of the plunger according to the displacement waveform, and acquiring the starting position of the plunger, the ending position of the plunger and the number of limit positions between the starting position and the ending position within the first movement duration;
s4, acquiring the working displacement of the plunger corresponding to the first motion duration according to the starting position, the ending position and the limit position times;
and S5, acquiring the cross-sectional area of the plunger so as to acquire the injection flow of the plunger pump according to the working displacement and the cross-sectional area.
Preferably, in step S4, the working displacement of the plunger corresponding to the first movement duration is obtained according to the starting position, the ending position and the limit position times; the method comprises the following steps:
s41, acquiring a first movement direction of the plunger at the starting position and a second movement direction of the plunger at the ending position according to the displacement waveform, executing the steps S42 to S44 when the limit position number is less than or equal to 1, and executing the step S45 when the limit position number is greater than 1;
s42, judging whether the first movement direction is consistent with the second movement direction, if so, executing the step S43, and if not, executing the step S44;
s43, acquiring the distance between the starting position and the ending position as the working displacement;
s44, acquiring a first distance moved by the plunger from the starting position in the first movement direction and a second distance moved by the plunger in the second movement direction when the plunger reaches the ending position, and acquiring the sum of the first distance and the second distance as the working displacement;
and S45, acquiring a third distance of the plunger moving in the first movement direction from the starting position, a fourth distance of the plunger moving in the second movement direction when reaching the ending position, and an extreme value distance between adjacent extreme positions, and taking the sum of the third distance, the fourth distance and all the extreme value distances as the working displacement.
Preferably, the method for testing the performance of the double-acting plunger pump further comprises the following steps:
s6, acquiring the complete stroke times of the plunger according to the limit position times, acquiring the stroke distance of the plunger in each complete stroke when the complete stroke times is more than 1, and acquiring the plunger stroke test result of the plunger pump according to the sum of all the stroke distances and the complete stroke times.
Preferably, the method for testing the performance of the double-acting plunger pump further comprises the following steps:
and S7, when the number of times of the limit positions is greater than 1, acquiring a second movement duration corresponding to the plunger from the first limit position to the last limit position, and acquiring the plunger movement frequency of the plunger pump according to the second movement duration and the number of times of the limit positions.
Preferably, in the step S2, the generating a displacement waveform of the plunger during the movement of the plunger according to the real-time displacement amount; the method comprises the following steps:
and receiving a first trigger instruction so as to start recording the real-time displacement or end recording the real-time displacement according to the first trigger instruction.
Preferably, in the step S2, the generating a displacement waveform of the plunger during the movement of the plunger according to the real-time displacement amount; the method comprises the following steps:
receiving a second trigger instruction, monitoring the real-time displacement of the plunger according to the second trigger instruction so as to record the number of times of an initial extreme value of which the real-time displacement is an extreme value, and starting to record the real-time displacement when the number of times of the initial extreme value of the real-time displacement is greater than a preset number of times; and/or
And receiving a third trigger instruction, and monitoring the real-time displacement of the plunger according to the third trigger instruction so as to stop recording the real-time displacement when the real-time displacement is the extreme value.
Preferably, the recording of the real-time displacement amount is started when the number of initial extreme values of the real-time displacement amount is greater than a preset number; the method comprises the following steps:
and after the preset times, starting to record the real-time displacement when the real-time displacement is at the extreme value.
The invention also constructs a system for testing the performance of the double-acting plunger pump, which comprises: the device comprises a displacement sensing unit, a first processing unit, a second processing unit, a third processing unit, a fourth processing unit and a second processing unit;
the displacement sensing unit is arranged corresponding to the plunger in the plunger pump so as to monitor the position change of the plunger in the movement process and generate a corresponding position signal;
the first processing unit is connected with the displacement sensing unit and used for receiving the position signal to generate corresponding real-time displacement data;
the second processing unit is used for generating a displacement waveform of the plunger in the motion process of the plunger according to the real-time displacement;
the third processing unit is used for acquiring a first movement duration corresponding to the movement process of the plunger according to the displacement waveform, and the starting position of the plunger, the ending position of the plunger and the limit position times of the plunger in the first movement duration;
the fourth processing unit is used for acquiring the working displacement of the plunger corresponding to the first movement duration according to the starting position, the ending position and the limit position times;
the fifth processing unit is used for acquiring the cross-sectional area of the plunger so as to acquire the injection flow of the plunger pump according to the working displacement and the cross-sectional area.
Preferably, the system for testing the performance of the double-acting plunger pump further comprises: the device comprises a sixth processing unit, a first judging unit, a second judging unit, a first executing unit, a second executing unit and a third executing unit;
the sixth processing unit is used for acquiring a first movement direction of the plunger at the starting position and a second movement direction of the plunger at the ending position according to the displacement waveform;
the first judging unit is used for judging the number of times of the limit position, driving the second judging unit to work when the number of times of the limit position is less than 1, and driving the first executing unit to work when the number of times of the limit position is greater than or equal to 1
The second judging unit is used for judging whether the first movement direction is consistent with the second movement direction, driving a second execution unit to work when the first movement direction is consistent with the second movement direction, and driving a third execution unit to work when the first movement direction is not consistent with the second movement direction;
the first execution unit is used for acquiring a third distance moved by the plunger in the first movement direction from the starting position, a fourth distance moved by the plunger in the second movement direction when the plunger reaches the ending position, and an extreme distance of the plunger in each complete stroke, so as to take the sum of the third distance, the fourth distance and all the extreme distances as the working displacement;
the second execution unit is used for acquiring the distance between the starting position and the ending position as the working displacement;
the third executing unit is configured to acquire a first distance that the plunger moves in the first moving direction from the start position and a second distance that the plunger moves in the second moving direction when reaching the end position, and acquire a sum of the first distance and the second distance as the working displacement.
The displacement sensing unit comprises a laser displacement sensor;
the light source of the laser sensor is arranged opposite to the flange plate of the plunger and used for detecting the position change of the flange plate of the plunger so as to obtain the position change of the plunger.
The method and the system for testing the performance of the double-acting plunger pump have the following beneficial effects that: the testing process is simple, and the testing precision is high.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a process flow diagram of one embodiment of a method of testing the performance of a dual action plunger pump of the present invention;
FIG. 2 is a process flow diagram of another embodiment of a method of testing the performance of a dual action plunger pump of the present invention;
FIG. 3 is a schematic diagram of one embodiment of plunger movement in a method of testing the performance of a dual action plunger pump of the present invention;
FIG. 4 is a schematic diagram of one embodiment of a displacement waveform of the plunger of FIG. 3;
FIG. 5 is a schematic view of another embodiment of the displacement waveform of the plunger of FIG. 3;
FIG. 6 is a schematic diagram of another embodiment of plunger movement in a method of testing the performance of a dual action plunger pump of the present invention;
FIG. 7 is a schematic view of one embodiment of a displacement waveform of the plunger of FIG. 6;
fig. 8 is a schematic view of another embodiment of the displacement waveform in the movement of the plunger of fig. 6.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in a first embodiment of a method for testing the performance of a double acting plunger pump according to the present invention, the method comprises:
s1, setting a displacement monitoring point, and monitoring the real-time displacement of the plunger in the plunger pump relative to the displacement monitoring point in the movement process at the displacement monitoring point; during operation of the double-acting plunger pump, the double-acting plunger pump causes the suction and discharge of liquid through the back and forth movement of the plunger. It can set up the monitoring point in the suitable position of plunger pump to monitor the displacement of plunger pump during plunger pump's plunger motion. This displacement may be understood as a relative displacement, i.e. the real-time distance of the plunger relative to the displacement monitoring point.
S2, generating a displacement waveform of the plunger in the movement process of the plunger according to the real-time displacement amount, and marking the limit position of the plunger in the displacement waveform; after the real-time displacement of the plunger relative to the displacement monitoring point is obtained, the displacement waveform of the movement of the plunger is generated according to the corresponding relation between the real-time displacement and the time point of the movement of the plunger. The displacement waveform can obtain the variation relation between the time point and the real-time displacement. It will also be appreciated that in some embodiments, the final displacement waveform may be generated by fitting a formula to several data corresponding to the amount of real-time displacement obtained. The time point may be an absolute time or a relative time. When the real-time displacement is absolute time, the real-time displacement corresponds to the corresponding occurrence time. When the plunger is relative to time, the plunger can record the real-time displacement corresponding to a reference time according to the reference of the certain time, namely the reference time, obtain the time interval relative to the reference time according to a preset rule, record the real-time displacement corresponding to the time, and sequentially establish the corresponding relation between the real-time displacement and the time interval so as to obtain the displacement waveform of the plunger. The displacement direction change point can be obtained according to the displacement waveform of the plunger, the direction change point corresponds to the movement limit position of the plunger, and the limit position comprises the maximum distance value and the minimum distance value of the movement of the plunger relative to the displacement monitoring point. In practice, it is usually determined whether the direction of the displacement change changes during the movement of the plunger. It will be appreciated that a change in displacement from increasing to decreasing or decreasing to increasing is identified as the plunger being in the extreme position. In the generated displacement waveform, the limit position corresponding to the plunger in the waveform is obtained according to the principle. Therefore, the extreme position of the generated displacement waveform can be acquired and identified according to the direction change of the waveform.
S3, acquiring a first movement duration corresponding to the movement process of the plunger according to the displacement waveform, and the initial position of the plunger, the end position of the plunger and the limit position times between the initial position and the end position within the first movement duration; after the displacement waveform diagram is obtained, a displacement waveform segment corresponding to the plunger in a certain time period can be obtained according to the displacement waveform diagram, the displacement amount of the plunger corresponding to the starting point of the time period can be understood as the starting position of the plunger in the time period, the displacement amount of the plunger corresponding to the ending point of the time period can be understood as the ending position of the plunger in the time period, and the position and the displacement amount can be understood as the distance relative to the displacement monitoring point. The start and end positions of its acquisition may also be identified in the displacement waveform. Meanwhile, the number of times of the limit position between the starting position and the ending position can be obtained according to the displacement waveform of the time period. Which can be obtained by means of counting.
S4, acquiring working displacement of the plunger corresponding to the first movement duration according to the initial position, the end position and the limit position times; the working displacement of the plunger movement in the first movement duration can be obtained through a data calculation method according to the obtained starting position and the ending position of the movement duration and the corresponding limit position times. This working displacement may be understood as the action in the movement of the plunger for expelling liquid.
And S5, acquiring the cross-sectional area of the plunger to acquire the injection flow of the plunger pump according to the working displacement and the cross-sectional area. And when the working displacement of the plunger in the first motion duration is obtained, the cross sectional area of the plunger can be obtained at the same time, and the injection flow of the plunger pump is obtained according to the working displacement and the cross sectional area, so that the injection performance test of the injection pump is completed. The cross-sectional area of the plunger can be directly input and provided by a user manually, and the cross-sectional area of the plunger can be obtained according to information of the plunger pump by acquiring relevant information of the plunger pump such as the type of the plunger pump. After the test result of the injection flow is obtained, the test result can be compared with the standard range to obtain a judgment result of whether the working performance of the plunger is qualified or not. In still other embodiments, the obtained injection flow rate is modified according to the information of the plunger pump by a correction factor, so as to determine whether the working performance of the plunger pump is qualified according to the modification result. For example, a correction coefficient of 95% is used for correction.
As shown in fig. 2, in one embodiment, in step S4, the working displacement of the plunger corresponding to the first movement duration is acquired according to the start position, the end position and the limit position number; the method comprises the following steps:
s41, acquiring a first movement direction corresponding to the plunger at the starting position and a second movement direction corresponding to the plunger at the ending position according to the displacement waveform, executing the steps S42 to S44 when the number of times of the limit position is less than or equal to 1, and executing the step S45 when the number of times of the limit position is greater than 1;
s42, judging whether the first movement direction is consistent with the second movement direction, if so, executing a step S43, and if not, executing a step S44;
s43, acquiring the distance between the starting position and the ending position as the working displacement;
s44, acquiring a first distance moved by the plunger from the initial position in the first movement direction and a second distance moved by the plunger in the second movement direction when the plunger reaches the end position, and acquiring the sum of the first distance and the second distance as the working displacement;
and S45, acquiring a third distance moved by the plunger in the first movement direction from the starting position, a fourth distance moved by the plunger in the second movement direction when the plunger reaches the ending position, and an extreme value distance between adjacent extreme positions, and taking the sum of the third distance, the fourth distance and all extreme value distances as the working displacement.
Specifically, the plunger is reciprocated in the movement process, and ideally, the displacement of the plunger and the waveform formed by the displacement and the time are sine wave or cosine wave waveform distribution. However, in general, during the movement of the plunger, due to the steering of a mechanical mechanism in the plunger pump system, the hysteresis effect of a hydraulic control system and the like, the obtained displacement waveform of the plunger is not a standard sine-cosine curve. As shown in fig. 3 to 8, in an ideal case, the course of the working displacement of the plunger corresponding to the first movement duration is obtained according to the starting position, the end position and the number of extreme positions. In the movement of the plunger, a first movement direction corresponding to the plunger at the start position, that is, a movement direction of the plunger when moving from the start position, and a second movement direction corresponding to the plunger at the end position, that is, a movement direction of the plunger when reaching the end position, may be obtained based on the obtained displacement waveform of the plunger. And it is determined whether the number of limit positions thereof in the period is less than or equal to 1. If the number of times of the extreme position in the time period is less than or equal to 1, it indicates that the plunger has not undergone a complete forward or backward motion, it can be determined whether a first motion direction corresponding to the starting position is consistent with a second motion direction of the ending position, if so, the distance between the starting position and the ending position is directly acquired as the working displacement, and if not, the distance from the starting position to an extreme value of the motion position of the plunger, that is, the first distance moved in the first motion direction and the distance moved from the extreme value passed by the plunger to the ending position when the plunger reaches the ending position, that is, the second distance moved in the second motion direction when the plunger reaches the ending position, are acquired as the working displacement. If the number of the limit positions in the time period is more than 1, the plunger is indicated to have undergone at least one complete forward or backward movement, and one forward or backward movement corresponds to the extreme distance between the adjacent limit positions. The working stroke of the plunger is obtained by including the sum of all extreme distances, that is, the working displacement is obtained by taking the sum of a third distance that the plunger moves in the first movement direction from the initial position and a fourth distance that the plunger moves in the second movement direction when the plunger reaches the end position, that is, the sum of all extreme distances. The extreme value can be a maximum extreme value DMax and a minimum extreme value DMin which the distances of the monitoring points relative to the displacement are the same, and the running direction of the plunger is changed at the position of the extreme value.
As shown in fig. 3, the first moving direction corresponding to the start position coincides with the second moving direction corresponding to the end position. As shown in fig. 4, when the number of times of the extreme position in the time period is less than or equal to 1, the working displacement is D ═ DE-DS |, where DS is the distance between the starting position and the monitoring point of the relative displacement, and DE is the distance between the ending position and the monitoring point of the relative displacement, and the working displacement is obtained according to the difference between the two distances. As shown in fig. 5, when the number of the extreme positions in the time period is greater than 1, the working displacement D | DMa-DS | + | DMb-DE | + ∑ n | DM isi-DMi-1I is an integer greater than 1, where DMa is the distance between the extreme position corresponding to the starting position and the displacement monitoring point, the extreme position being the first extreme reached when the plunger starts to move from the starting position, and DMb is the distance between the extreme position corresponding to the ending position and the displacement monitoring point, the extreme position being the last extreme position before the plunger moves to the ending position, DMiAnd DMi-1For the distance of successive relative displacement monitoring points of two polar positions during operation, i.e. | DMi-DMi-1And | is any adjacent two-pole distance.
As shown in fig. 6, the first movement direction corresponding to the start position does not coincide with the second movement direction corresponding to the end position. Wherein, as shown in fig. 7, when the number of times of the limit position in the time period is less than or equal to 1, the working displacement is D ═ DMa-DS | + | DMb-DE |, as shown in fig. 8, when the number of times of the limit position in the time period is greater than 1, the working displacement is D ═ DMa-DS | + | DMb-DE | + ∑ n | DM |i-DMi-1Where DS is the distance between the start position and the displacement monitoring point, DE is the distance between the end position and the displacement monitoring point, and DMa is the distance corresponding to the start positionThe distance between the extreme position, i.e. the first extreme reached when the plunger starts to move from the initial position, and the distance between the extreme position, i.e. the last extreme before the plunger moves to the end position, and the displacement monitoring point, DMb, is the distance between the extreme position corresponding to the end position and the displacement monitoring point, DMiAnd DMi-1For successive relative displacement of two extreme positions during the full stroke, i.e. | DMi-DMi-1And | is any adjacent two-pole distance.
In one embodiment, a method for testing the performance of a dual action plunger pump of the present invention further comprises:
and S6, acquiring the complete stroke times of the plunger according to the limit position times, acquiring the stroke distance of the plunger in each complete stroke when the complete stroke times is more than 1, and acquiring the plunger stroke test result of the plunger pump according to the sum of all the stroke distances and the complete stroke times. The complete stroke of the plunger is determined according to the limit position times of the first motion duration in the displacement waveform, and the complete stroke is the process that the plunger returns to the limit position after moving from one limit position to the other limit position. The corresponding travel distance in each complete travel is the difference between its two extreme positions. The specific process is that when the number of the limit positions is odd, the complete travel number is equal to (the number of the limit positions-1)/2, and when the number of the limit positions is even, the complete travel number is equal to the number of the limit positions/2-1. And acquiring the stroke distance of the plunger in each complete stroke according to the displacement waveform, and acquiring final stroke test result data of the time period according to all the stroke distances and the complete stroke times.
In one embodiment, a method for testing the performance of a dual action plunger pump of the present invention further comprises:
and S7, when the number of the limit positions is larger than 1, acquiring a second movement duration corresponding to the plunger from the first limit position to the last limit position, and acquiring the plunger movement frequency of the plunger pump according to the second movement duration and the number of the limit positions. Specifically, a second movement duration from the first limit position to the last limit position is obtained according to the displacement waveform, and the plunger movement frequency is (limit position times-1)/2 times the second movement duration.
Optionally, in step S2, a displacement waveform of the plunger during the movement of the plunger is generated according to the real-time displacement amount; the method comprises the following steps: and receiving a first trigger instruction to start recording the real-time displacement or end recording the real-time displacement according to the first trigger instruction. When the real-time displacement is acquired and the displacement waveform is generated, the plunger movement can be in constant motion, the acquisition of the real-time displacement of the plunger by the displacement monitoring point is also continuous, but in the process of generating the corresponding displacement waveform, the real-time displacement is triggered to start recording according to the trigger instruction generated by the trigger unit so as to start generating the corresponding displacement waveform. The trigger instruction may be generated by a user trigger.
In one embodiment, in step S2, a displacement waveform of the plunger during the movement of the plunger is generated according to the real-time displacement amount; the method comprises the following steps: receiving a second trigger instruction, monitoring the real-time displacement of the plunger according to the second trigger instruction to record the number of times of an initial extreme value taking the real-time displacement as an extreme value, and starting to record a displacement waveform when the number of times of the initial extreme value of the real-time displacement is greater than a preset number of times; before generating a displacement waveform according to the real-time displacement, the real-time displacement can be monitored through triggering, the number of times of an initial extreme value of which the real-time displacement is an extreme value is recorded, the real-time displacement before the number of times of the initial extreme value is not recorded, and the real-time displacement is recorded only after the number of times of the initial extreme value and the corresponding displacement waveform is generated.
Further, when the number of the initial extreme values of the real-time displacement is greater than the preset number, starting to record the real-time displacement; the method comprises the following steps: and after the preset times, starting to record the real-time displacement when the real-time displacement is at an extreme value. On the basis of the above, the real-time displacement amount is recorded and the corresponding displacement waveform is generated only after the initial limit times. The recording of the real-time displacement amount and the generation of the corresponding displacement waveform may be started when the extreme position is reached after the initial limit number. The initial limit times required to meet the time requirement can be set to be 2 times, namely after the two limit positions are passed, the real-time displacement is recorded.
In one embodiment, in step S2, a displacement waveform of the plunger during the movement of the plunger is generated according to the real-time displacement amount; the method comprises the following steps: and receiving a third trigger instruction, monitoring the real-time displacement of the plunger according to the third trigger instruction, and stopping recording the real-time displacement when the real-time displacement is an extreme value. In the process of generating the displacement waveform, the real-time displacement of the monitoring plunger can be triggered and detected according to the trigger instruction, so that the real-time displacement is stopped being recorded when the real-time displacement is an extreme value, namely the displacement waveform is not updated any more.
The invention discloses a performance test system of a double-acting plunger pump, which comprises: the device comprises a displacement sensing unit, a first processing unit, a second processing unit, a third processing unit, a fourth processing unit and a second processing unit;
the displacement sensing unit is arranged corresponding to a plunger in the plunger pump so as to monitor the position change of the plunger in the movement process and generate a corresponding position signal;
the first processing unit is connected with the displacement sensing unit and used for receiving the position signal to generate corresponding real-time displacement data;
the second processing unit is used for generating a displacement waveform of the plunger in the movement process of the plunger according to the real-time displacement;
the third processing unit is used for acquiring a first movement duration corresponding to the movement process of the plunger, and the initial position of the plunger, the end position of the plunger and the limit position times of the plunger in the first movement duration according to the displacement waveform;
the fourth processing unit is used for acquiring the working displacement of the plunger corresponding to the first movement duration according to the starting position, the ending position and the limit position frequency;
and the fifth processing unit is used for acquiring the cross-sectional area of the plunger so as to acquire the injection flow of the plunger pump according to the working displacement and the cross-sectional area.
Optionally, the system for testing the performance of the double-acting plunger pump of the present invention further includes: the device comprises a sixth processing unit, a first judging unit, a second judging unit, a first executing unit, a second executing unit and a third executing unit;
the sixth processing unit is used for acquiring a first movement direction corresponding to the plunger at the initial position and a second movement direction corresponding to the plunger at the end position according to the displacement waveform;
the first judging unit is used for judging the number of times of the limit positions, driving the second judging unit to work when the number of times of the limit positions is less than or equal to 1, and driving the first executing unit to work when the number of times of the limit positions is greater than 1
The second judging unit is used for judging whether the first movement direction is consistent with the second movement direction, driving the second execution unit to work when the first movement direction is consistent with the second movement direction, and driving the third execution unit to work when the first movement direction is not consistent with the second movement direction;
the first execution unit is used for acquiring a third distance of the plunger from the starting position in the first movement direction, a fourth distance of the plunger in the second movement direction when the plunger reaches the ending position, and an extreme value distance between adjacent extreme positions, so that the sum of the third distance, the fourth distance and all the extreme value distances is used as the working displacement;
the second execution unit is used for acquiring the distance between the starting position and the ending position as working displacement;
the third execution unit is used for acquiring a first distance of the plunger moving in the first movement direction from the starting position and a second distance of the plunger moving in the second movement direction when reaching the ending position, and acquiring the sum of the first distance and the second distance as the working displacement.
Specifically, the specific coordination operation process between the units of the double-acting plunger pump performance test system may specifically refer to the above-mentioned double-acting plunger pump performance test method, and details are not described here.
In one embodiment, the displacement sensing unit comprises a laser displacement sensor; the light source of the laser sensor is arranged opposite to the flange of the plunger and used for detecting the position change of the flange of the plunger so as to obtain the position change of the plunger. That is, the moving distance of the moving part with respect to the light source can be directly measured by the light source of the laser sensor.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (9)
1. A method for testing the performance of a double-acting plunger pump is characterized by comprising the following steps:
s1, setting a displacement monitoring point, and monitoring the real-time displacement of the plunger in the plunger pump relative to the displacement monitoring point in the movement process at the displacement monitoring point;
s2, generating a displacement waveform of the plunger in the motion process of the plunger according to the real-time displacement amount, and identifying the extreme position of the plunger in the displacement waveform;
s3, acquiring a first motion duration corresponding to the motion process of the plunger according to the displacement waveform, and acquiring the initial position of the plunger, the end position of the plunger and the number of limit positions between the initial position and the end position in the first motion duration;
s4, acquiring the working displacement of the plunger corresponding to the first motion duration according to the starting position, the ending position and the limit position times;
s5, acquiring the cross-sectional area of the plunger to acquire the injection flow of the plunger pump according to the working displacement and the cross-sectional area;
s6, acquiring the complete stroke times of the plunger according to the limit position times, acquiring the stroke distance of the plunger in each complete stroke when the complete stroke times is more than 1, and acquiring the plunger stroke test result of the plunger pump according to the sum of all the stroke distances and the complete stroke times.
2. A method for testing the performance of a double acting plunger pump according to claim 1, wherein in step S4, the working displacement of the plunger corresponding to the first movement duration is obtained according to the starting position, the ending position and the number of limit positions; the method comprises the following steps:
s41, acquiring a first movement direction of the plunger at the starting position and a second movement direction of the plunger at the ending position according to the displacement waveform, executing the steps S42 to S44 when the limit position number is less than or equal to 1, and executing the step S45 when the limit position number is greater than 1;
s42, judging whether the first movement direction is consistent with the second movement direction, if so, executing the step S43, and if not, executing the step S44;
s43, acquiring the distance between the starting position and the ending position as the working displacement;
s44, acquiring a first distance moved by the plunger from the starting position in the first movement direction and a second distance moved by the plunger in the second movement direction when the plunger reaches the ending position, and acquiring the sum of the first distance and the second distance as the working displacement;
and S45, acquiring a third distance of the plunger moving in the first movement direction from the starting position, a fourth distance of the plunger moving in the second movement direction when reaching the ending position, and an extreme value distance between adjacent extreme positions, and taking the sum of the third distance, the fourth distance and all the extreme value distances as the working displacement.
3. The method of testing performance of a double acting plunger pump of claim 1, further comprising:
and S7, when the number of times of the limit positions is greater than 1, acquiring a second movement duration corresponding to the plunger from the first limit position to the last limit position, and acquiring the plunger movement frequency of the plunger pump according to the second movement duration and the number of times of the limit positions.
4. A method for testing the performance of a double acting plunger pump according to claim 1, wherein in step S2, the generating of the displacement waveform of the plunger during the movement of the plunger according to the real-time displacement amount; the method comprises the following steps:
and receiving a first trigger instruction so as to start recording the real-time displacement or end recording the real-time displacement according to the first trigger instruction.
5. A method for testing the performance of a double acting plunger pump according to claim 1, wherein in step S2, the generating of the displacement waveform of the plunger during the movement of the plunger according to the real-time displacement amount; the method comprises the following steps:
receiving a second trigger instruction, monitoring the real-time displacement of the plunger according to the second trigger instruction so as to record the number of times of an initial extreme value of which the real-time displacement is an extreme value, and starting to record the real-time displacement when the number of times of the initial extreme value of the real-time displacement is greater than a preset number of times; and/or
And receiving a third trigger instruction, and monitoring the real-time displacement of the plunger according to the third trigger instruction so as to stop recording the real-time displacement when the real-time displacement is the extreme value.
6. A method of testing performance of a double acting plunger pump as claimed in claim 5, wherein said recording of said real time displacement is initiated when the number of initial extremes of said real time displacement is greater than a preset number; the method comprises the following steps:
and after the preset times, starting to record the real-time displacement when the real-time displacement is at the extreme value.
7. A dual action plunger pump performance testing system, comprising: the displacement sensor comprises a displacement sensing unit, a first processing unit, a second processing unit, a third processing unit, a fourth processing unit and a fifth processing unit;
the displacement sensing unit is arranged corresponding to the plunger in the plunger pump so as to monitor the position change of the plunger in the movement process and generate a corresponding position signal;
the first processing unit is connected with the displacement sensing unit and used for receiving the position signals to generate corresponding real-time displacement data;
the second processing unit is used for generating a displacement waveform of the plunger in the motion process of the plunger according to the real-time displacement;
the third processing unit is used for acquiring a first motion duration corresponding to the motion process of the plunger according to the displacement waveform, and the starting position of the plunger, the ending position of the plunger and the limit position times of the plunger in the first motion duration;
the fourth processing unit is used for acquiring the working displacement of the plunger corresponding to the first movement duration according to the starting position, the ending position and the limit position times;
the fifth processing unit is used for acquiring the cross-sectional area of the plunger so as to acquire the injection flow of the plunger pump according to the working displacement and the cross-sectional area.
8. The dual action plunger pump performance testing system of claim 7, further comprising: the device comprises a sixth processing unit, a first judging unit, a second judging unit, a first executing unit, a second executing unit and a third executing unit;
the sixth processing unit is used for acquiring a first movement direction of the plunger at the starting position and a second movement direction of the plunger at the ending position according to the displacement waveform;
the first judging unit is used for judging the number of times of the limit position, driving the second judging unit to work when the number of times of the limit position is less than 1, and driving the first executing unit to work when the number of times of the limit position is greater than or equal to 1
The second judging unit is used for judging whether the first movement direction is consistent with the second movement direction, driving a second execution unit to work when the first movement direction is consistent with the second movement direction, and driving a third execution unit to work when the first movement direction is not consistent with the second movement direction;
the first execution unit is used for acquiring a third distance of the plunger from the starting position in the first movement direction, a fourth distance of the plunger in the second movement direction when the plunger reaches the end position, and an extreme value distance of the plunger in each complete stroke, so as to take the sum of the third distance, the fourth distance and all the extreme value distances as the working displacement;
the second execution unit is used for acquiring the distance between the starting position and the ending position as the working displacement;
the third executing unit is configured to acquire a first distance that the plunger moves in the first moving direction from the start position and a second distance that the plunger moves in the second moving direction when reaching the end position, and acquire a sum of the first distance and the second distance as the working displacement.
9. The dual action plunger pump performance testing system of claim 7, wherein the displacement sensing unit comprises a laser displacement sensor;
and the light source of the laser sensor is arranged opposite to the flange plate of the plunger and is used for detecting the position change of the flange plate of the plunger so as to obtain the position change of the plunger.
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