An automatic vacuum pumping system, application and control method based on pulsation phenomenon

Abstract

The present invention discloses an automatic vacuum pumping system, application and control method based on the pulsation phenomenon. The automatic vacuum pumping system includes a drainage pump, a vacuum pump, a first drainage pipeline, a negative pressure sensor and a control system. The vacuum pump is connected to the drainage pump through a vacuum pumping pipeline; one end of the first drainage pipeline is connected to the drainage pump, and the end of the first drainage pipeline away from the drainage pump extends into the water sump. Whether the vacuum pumping is completed is judged according to the frequency of the water body pulsation phenomenon generated in the first drainage pipeline during the vacuum pumping process; the negative pressure sensor is arranged on the first drainage pipeline for monitoring the vacuum value of the first drainage pipeline; both the negative pressure sensor and the vacuum pump are electrically connected to the control system. The automatic vacuum pumping system uses the water body pulsation phenomenon to judge whether the drainage condition is reached, is not affected by the water level height and the sealing performance of the pipeline water pump, improves the automation degree of the drainage system and the reliability of automatic drainage, realizes unattended operation of the drainage system, and eliminates the operation of manually setting the vacuum degree.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage, and particularly relates to an automatic vacuum pumping system, application and control method based on the pulsation phenomenon. Background Technique

[0002] Vacuum pumping is a key link in the main drainage system of coal mines. The purpose of vacuum pumping is to draw the water in the sump into the water pump, fill the water pump with water, and smoothly drain the water to the ground when starting the water pump.

[0003] At present, the main ways to judge whether the vacuum pumping reaches the drainage condition are to calculate the negative pressure range through the water level, set a fixed vacuum pumping time, and set up a vacuum water tank.

[0004] The method of calculating the negative pressure range through the water level is mainly based on the pressure generated by the height of the water column. The calculation formula is p = ρgh, where P is the pressure, ρ is the density of water (1×10 3 kg / m 3 ), g is the acceleration due to gravity (9.8 N / kg), and h is the height from the pressure taking point to the liquid level. By measuring the height of the water level in the sump through a water level sensor and then calculating the negative pressure value required to pump the water into the water pump, this method can avoid vacuum pumping failures caused by loose seals in the pipeline or water pump. However, because the water quality conditions of each coal mine are different, and even the water quality conditions in the same coal mine in different seasons and at different tunneling depths are different, it has a great impact on the density of water, and the calculated pressure value will also change accordingly. Moreover, this method relies relatively highly on the measurement accuracy of the water level sensor. Once the water level sensor is damaged, drainage cannot be carried out in a timely manner.

[0005] Setting a fixed vacuum pumping time is also a common way to judge vacuum pumping. When the water pump and pipeline are well sealed, the vacuum degree can reach the drainage condition within 3 - 5 minutes. This method can avoid vacuum pumping failures caused by water level sensors and water quality. However, this method almost ignores the influence of the seal of the water pump and pipeline on vacuum pumping. Since the packing of the water pump will gradually leak air after long-term use, once air leakage occurs, the drainage system will not be able to work properly; moreover, this method will calibrate the water filling time according to the lowest water level degree for vacuum pumping time, which will inevitably cause over-vacuum pumping during normal drainage, reducing the drainage efficiency and increasing the system energy consumption.

[0006] As Figure 1 shown, the method of setting up a vacuum water tank is to place a vacuum water tank at the front end of the water pump. There needs to be enough water in the water tank. When the water pump is running, it drives the water in the vacuum water tank to suck the water in the sump into the water tank. This method requires the vacuum water tank to always be in a state of sufficient water, which will also keep the water pump side always in a state of being full of water. Long-term use will cause the water pump to be corroded by the water quality, thus shortening the service life of the water pump. Summary of the Invention

[0007] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, the present invention provides an automatic vacuum pumping system, application and control method based on the pulsation phenomenon. The automatic vacuum pumping system provided by the present invention avoids the influence of other factors on the negative pressure of the drainage pipe during vacuum pumping, and improves the automation degree and the reliability of automatic drainage of the drainage system.

[0008] On the one hand, the present invention provides an automatic vacuum pumping system based on the pulsation phenomenon, including:

[0009] A drainage pump;

[0010] A vacuum pump, the vacuum pump is connected to the drainage pump through a vacuum pumping pipeline;

[0011] A first drainage pipeline, one end of the first drainage pipeline is connected to the drainage pump, and the end of the first drainage pipeline far from the drainage pump extends into a water sump, and it is judged whether the vacuum pumping is completed according to the frequency of the water body pulsation phenomenon generated in the first drainage pipeline during the vacuum pumping process;

[0012] A negative pressure sensor, the negative pressure sensor is arranged on the first drainage pipeline and is used for monitoring the vacuum value of the first drainage pipeline;

[0013] A control system, both the negative pressure sensor and the vacuum pump are electrically connected to the control system.

[0014] In some embodiments, the control system includes:

[0015] A data acquisition module, the data acquisition module is electrically connected to the negative pressure sensor, and the data acquisition module is used for acquiring the data of the negative pressure sensor and transmitting the data to a data analysis and processing module;

[0016] The data analysis and processing module, the data analysis and processing module issues an instruction to control the on-off of the vacuum pump after analyzing and processing the data.

[0017] In some embodiments, the data acquisition module acquires the vacuum value every 100 - 200 ms.

[0018] In some embodiments, if the difference between two adjacent vacuum values in continuous sampling is greater than a set value, a fluctuation occurs.

[0019] In some embodiments, the set value is 350 - 700 Pa.

[0020] In some embodiments, after a fluctuation occurs, the number of accumulated fluctuations is counted, and when the number of fluctuations is above a set number, the vacuum pumping is completed.

[0021] In some embodiments, the set number of times is 3 - 7.

[0022] In some embodiments, a second drainage pipe is further included. One end of the second drainage pipe is connected to the drainage pump, and the other end of the second drainage pipe away from the drainage pump extends to the ground.

[0023] On the other hand, the present invention proposes an application of an automatic vacuum pumping system based on the pulsation phenomenon, applying the automatic vacuum pumping system to the main drainage monitoring system of coal mines.

[0024] On the other hand, the present invention proposes a control method for an automatic vacuum pumping system based on the pulsation phenomenon, including the following steps:

[0025] (1) Drainage starts, and vacuum pumping begins until the vacuum value ≤ the initial value;

[0026] (2) Determine whether the vacuum value starts to fluctuate. If the vacuum value starts to fluctuate, accumulate the number of fluctuations. If the vacuum value does not fluctuate, determine whether the vacuum pumping times out; if the vacuum pumping does not time out, continue to determine whether the vacuum value starts to fluctuate. If the vacuum pumping times out, stop the vacuum pumping;

[0027] (3) Determine whether the number of fluctuations meets the condition: the number of fluctuations ≥ the set number of times. If the number of fluctuations ≥ the set number of times, the vacuum pumping is completed. If the number of fluctuations < the set number of times, determine whether the vacuum pumping times out; if the vacuum pumping does not time out, return to step (2) to determine whether the vacuum value starts to fluctuate. If the vacuum pumping times out, stop the vacuum pumping.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The automatic vacuum pumping system provided by the present invention avoids the influence of other factors on the negative pressure of the drainage pipe during vacuum pumping, improves the automation degree of the drainage system and the reliability of automatic drainage, realizes unattended operation of the drainage system, and eliminates the operation of artificially setting the vacuum degree.

[0030] The automatic vacuum pumping system provided by the present invention is applied to the drainage system, improves the water intake recognition of the drainage system, and also makes great contributions to energy conservation and improving the system response speed.

[0031] The automatic vacuum pumping system provided by the present invention uses the water body pulsation phenomenon to judge whether the drainage condition is reached, and is not affected by the water level height and the sealing performance of the pipeline water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above-mentioned and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, wherein:

[0033] Figure 1 Schematic diagram of a water filling device for a vacuum water tank in the prior art;

[0034] Figure 2 Schematic diagram of the structure of the vacuum pumping system provided by the present invention;

[0035] Figure 3 Control diagram of the vacuum pumping system provided by the present invention;

[0036] Figure 4 Flowchart of the control method of the vacuum pumping system provided by the present invention.

[0037] Description of reference numerals:

[0038] Drainage pump 1, negative pressure sensor 2, first drainage pipe 3, water filter 4, second drainage pipe 5, vacuum pumping pipe 6, vacuum pump 7. Detailed implementation manners

[0039] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] The automatic vacuum pumping system based on the pulsation phenomenon proposed according to the embodiments of the present invention will be described below with reference to the drawings.

[0041] As Figures 2 - 4 shown, the automatic vacuum pumping system based on the pulsation phenomenon of the present invention includes: a drainage pump 1, a vacuum pump 7, a drainage pipe, a negative pressure sensor 2, and a control system.

[0042] The automatic vacuum pumping system of the present invention can be applied in the main drainage monitoring system of coal mines. The vacuum pumping process is a key link in the main drainage system of coal mines. Through the vacuum pumping process, the water in the sump can be introduced into the drainage pump 1 to fill the drainage pump 1 with water. After the vacuum pumping is completed, when the drainage pump 1 is started, the water in the sump can be smoothly discharged to the ground.

[0043] The vacuum pump 7 is connected to the drainage pump 1 through the vacuum pumping pipe 6, that is, one end of the vacuum pumping pipe 6 is connected to the vacuum pump 7, and the end of the vacuum pumping pipe 6 far from the vacuum pump 7 is connected to the drainage pump 1. The vacuum pump 7 pumps vacuum through the vacuum pumping pipe 6, thereby introducing the water in the sump (not shown) into the drainage pump 1 to fill the drainage pump 1 with water.

[0044] In some embodiments, the vacuum pump 7 is electrically connected to the control system, and the control system controls the on and off of the vacuum pump 7.

[0045] In some embodiments, the drainage pipe includes a first drainage pipe 3 and a second drainage pipe 5. One end of the first drainage pipe 3 is connected to the drainage pump 1, and the end of the first drainage pipe 3 away from the drainage pump 1 extends into the water sump. The first drainage pipe 3 functions as a suction pipe. Under the action of the vacuum pump 7, the water in the water sump is introduced into the drainage pump 1 through the first drainage pipe 3.

[0046] It can be understood that the end of the first drainage pipe 3 extending into the water sump can be connected to a water filter 4, and the water filter 4 is placed in the water sump. The water filter 4 functions to filter out impurities, preventing the first drainage pipe 3 from being blocked by impurities.

[0047] In some embodiments, a negative pressure sensor 2 is provided on the first drainage pipe 3. During the vacuum pumping process, the negative pressure sensor 2 is used to monitor the vacuum value of the first drainage pipe 3. It can be understood that the negative pressure sensor 2 for monitoring the vacuum value of the first drainage pipe 3 can measure the pressure point value of the first drainage pipe 3. The negative pressure sensor 2 is electrically connected to the control system, and the negative pressure sensor 2 transmits the vacuum value data of the first drainage pipe 3 to the control system.

[0048] In some embodiments, one end of the second drainage pipe 5 is connected to the drainage pump 1, and the end of the second drainage pipe 5 away from the drainage pump 1 extends to the ground. The second drainage pipe 5 functions as a drain pipe, and the water in the water sump is discharged to the ground through the second drainage pipe 5. After the vacuum pumping is completed, the drainage pump 1 is filled with water. When the drainage pump 1 is started, the water is smoothly discharged to the ground through the second drainage pipe 5, thereby discharging the water in the water sump to the ground.

[0049] In some embodiments, the control system includes a data acquisition module and a data analysis and processing module. The data acquisition module is used to acquire the vacuum value data of the negative pressure sensor 2, and the data analysis and processing module is used to analyze and process the data and issue an instruction to control the on / off of the vacuum pump 7 according to the data analysis result. Specifically, the negative pressure sensor 2 is electrically connected to the data acquisition module, and the data acquisition module acquires the data of the negative pressure sensor 2 at regular intervals; the data acquisition module transmits the acquired data to the data analysis and processing module, and the data analysis and processing module analyzes and processes the received data and issues an instruction to control the on / off of the vacuum pump 7 according to the processing result.

[0050] The present invention utilizes the fact that the first drainage pipe 3 will generate a water body pulsation phenomenon in the drainage pipe during the vacuum pumping process, and judges whether the drainage condition is reached, that is, whether the vacuum pumping is completed, according to the frequency of the pulsation phenomenon.

[0051] The principle of the pulsation phenomenon is as follows: When the first drainage pipe 3 evacuates the air, it will draw the water in the sump into the drainage pump 1. During this process, the measured pressure point value of the first drainage pipe 3 will gradually decrease. After the drainage pump 1 is filled with water, theoretically, the measured pressure point value of the first drainage pipe 3 should remain unchanged. However, due to the action of the vacuum extraction pipe 6, a part of the water in the drainage pump 1 will be pumped out. At this time, a pressure relief effect will be formed at the measured pressure point of the first drainage pipe 3, resulting in a water body pulse, which will form an oscillation of the measured pressure point value from the detection perspective. The control system determines whether the drainage condition is met, that is, whether the vacuum extraction is completed, by capturing the frequency of this pulsation. This method is not affected by the water level and the sealing performance of the pipeline pump.

[0052] It can be understood that the measured pressure point value of the first drainage pipe 3 is the vacuum value of the first drainage pipe 3.

[0053] In some embodiments, the data acquisition module acquires the vacuum value every 100 - 200 ms. It can be understood that the interval time for the data acquisition module to acquire data is adjusted according to the specific on-site situation.

[0054] In some embodiments, if the difference between two adjacent vacuum values in continuous sampling is greater than the set value, a fluctuation occurs. In some embodiments, the set value is 350 - 700 Pa.

[0055] It can be understood that when the water level in the sump is high, the pulsation phenomenon will occur relatively quickly; when the water level in the sump is low, the time for the pulsation phenomenon to occur will be longer. If the vacuum extraction speed on the pipeline drainage pump side is greater than the air leakage speed, the pulsation phenomenon will also occur. The difference is that the peak value of the pulsation will be relatively small, but the occurrence of this pulsation phenomenon also indicates that the cavity of the drainage pump 1 is filled with water and it can drain water normally; if the vacuum extraction speed on the pipeline drainage pump side is less than the air leakage speed, the pulsation phenomenon will not occur and the vacuum measurement point value will remain unchanged. Therefore, on the one hand, the use of the present invention improves the water filling recognition of the drainage system, and at the same time, it also makes great contributions to energy conservation and system response improvement.

[0056] In addition, there are generally the following types of air leakage situations: The packing of the drainage pump becomes loose due to long use time, resulting in air leakage due to poor sealing; air leakage occurs at the installation position of the negative pressure sensor 2 on the first drainage pipe 3; air leakage occurs due to poor sealing between the drainage pump 1 and the first drainage pipe 3.

[0057] In some embodiments, after a fluctuation occurs, the number of fluctuations is counted. If the number of fluctuations is above the set number of fluctuations, the vacuum extraction is completed.

[0058] In some embodiments, the set number is 3 - 7.

[0059] The control method of the automatic vacuum extraction system based on the pulsation phenomenon includes the following steps:

[0060] (1) Drainage starts, and vacuum pumping begins until the vacuum value ≤ the initial value.

[0061] (2) Determine whether the vacuum value starts to fluctuate. If the vacuum value starts to fluctuate, accumulate the number of fluctuations. If the vacuum value does not fluctuate, determine whether the vacuum pumping times out. If the vacuum pumping does not time out, continue to determine whether the vacuum value starts to fluctuate. If the vacuum pumping times out, stop the vacuum pumping.

[0062] (3) Determine whether the number of fluctuations meets the condition: the number of fluctuations ≥ the set number. If the number of fluctuations ≥ the set number, the vacuum pumping is completed. If the number of fluctuations < the set number, determine whether the vacuum pumping times out. If the vacuum pumping does not time out, return to step (2) to determine whether the vacuum value starts to fluctuate. If the vacuum pumping times out, stop the vacuum pumping.

[0063] After drainage starts in step (1), vacuum pumping begins. Determine whether the vacuum value meets the condition that the vacuum value ≤ the initial value. If the vacuum value ≤ the initial value, proceed to the next step. If the vacuum value is greater than the initial value, continue vacuum pumping. Here, the initial value is the pressure measurement point value of the first drainage pipe before the start of vacuum pumping, and the initial value is collected by the data acquisition module.

[0064] After the vacuum value ≤ the initial value in step (2), determine whether the vacuum value starts to fluctuate. If the vacuum value starts to fluctuate, accumulate the number of fluctuations. If the vacuum value does not fluctuate, determine whether the vacuum pumping times out. If the vacuum pumping does not time out, continue to determine whether the vacuum value starts to fluctuate. If the vacuum pumping times out, stop the vacuum pumping. When the vacuum pumping process ends due to timeout, a "vacuum pumping failure" message is prompted at the host computer end.

[0065] In step (3), determine whether the number of fluctuations meets the condition: the number of fluctuations ≥ the set number. If the number of fluctuations ≥ the set number, the vacuum pumping is completed. If the number of fluctuations < the set number, determine whether the vacuum pumping times out. If the vacuum pumping does not time out, return to step (2) to determine whether the vacuum value starts to fluctuate. If the vacuum pumping times out, stop the vacuum pumping. When the vacuum pumping process ends due to timeout, a "vacuum pumping failure" message is prompted at the host computer end.

[0066] In a specific embodiment, the data acquisition module collects the vacuum value every 100 ms. If the difference between two adjacent vacuum values in continuous sampling is greater than the set value, a fluctuation occurs. The set value is 350 Pa. After a fluctuation occurs, count the number of fluctuations. When the number of fluctuations is above the set number of fluctuations, the vacuum pumping is completed. Here, the set number is 7.

[0067] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms may be directed to different embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0069] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An automatic vacuum pumping system based on the pulsation phenomenon, characterized in that, it includes: a drainage pump; a vacuum pump, and the vacuum pump is connected to the drainage pump through a vacuum pumping pipeline; a first drainage pipeline, one end of the first drainage pipeline is connected to the drainage pump, and the end of the first drainage pipeline away from the drainage pump extends into a water sump, and it is judged whether the vacuum pumping is completed according to the frequency of the water body pulsation phenomenon generated in the first drainage pipeline during the vacuum pumping process; a negative pressure sensor, the negative pressure sensor is arranged on the first drainage pipeline and is used for monitoring the vacuum value of the first drainage pipeline; a control system, both the negative pressure sensor and the vacuum pump are electrically connected to the control system, the control method of the automatic vacuum pumping system includes the following steps: (1) Start draining water and start vacuum pumping until the vacuum value ≤ the initial value; (2) Judge whether the vacuum value starts to fluctuate. If the vacuum value starts to fluctuate, then accumulate the number of fluctuations. If the vacuum value does not fluctuate, then judge whether the vacuum pumping times out; if the vacuum pumping does not time out, then continue to judge whether the vacuum value starts to fluctuate. If the vacuum pumping times out, then stop the vacuum pumping; (3) Judge whether the number of fluctuations meets: the number of fluctuations ≥ the set number. If the number of fluctuations ≥ the set number, then the vacuum pumping is completed. If the number of fluctuations < the set number, then judge whether the vacuum pumping times out; if the vacuum pumping does not time out, then return to step (2) to judge whether the vacuum value starts to fluctuate. If the vacuum pumping times out, then stop the vacuum pumping.

2. The automatic vacuum pumping system according to claim 1, characterized in that, the control system includes: a data acquisition module, the data acquisition module is electrically connected to the negative pressure sensor, and the data acquisition module is used for acquiring the data of the negative pressure sensor and transmitting the data to the data analysis and processing module; the data analysis and processing module, and the data analysis and processing module issues an instruction to control the on-off of the vacuum pump after analyzing and processing the data.

3. The automatic vacuum pumping system according to claim 2, characterized in that, the data acquisition module acquires the vacuum value once every 100 - 200 ms.

4. The automatic vacuum pumping system according to claim 1, characterized in that, if the difference between two adjacent vacuum values in continuous sampling is greater than the set value, then a fluctuation occurs.

5. The automatic vacuum pumping system according to claim 4, characterized in that, the set value is 350 - 700 Pa.

6. The automatic vacuum pumping system according to claim 4, characterized in that, after a fluctuation occurs, accumulate the number of fluctuations, and when the number of fluctuations is above the set number, the vacuum pumping is completed.

7. The automatic vacuum pumping system according to claim 6, characterized in that, the set number is 3 - 7.

8. The automatic vacuum pumping system according to claim 1, characterized in that, it further includes a second drainage pipeline, one end of the second drainage pipeline is connected to the drainage pump, and the end of the second drainage pipeline away from the drainage pump extends to the ground.

9. The application of an automatic vacuum pumping system based on the pulsation phenomenon, characterized in that, Use the automatic vacuum pumping system as described in any one of claims 1-8, and apply the automatic vacuum pumping system to the main drainage monitoring system of a coal mine.

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