Air compression station air supply system driven by air floating shaft

Abstract

The invention relates to an air compression station air supply system driven by an air floating shaft, and belongs to the technical field of air compression stations, the air compression station air supply system comprises an internal monitoring module, an external monitoring module, a control module and the air floating shaft, the internal monitoring module is used for monitoring air pressure in the air floating shaft and uploading the air pressure to the control module, and the air floating shaft is used for driving an air supply fan. The external monitoring module is used for acquiring the target output gas quantity of the air compression station and uploading the target output gas quantity to the control module; the control module is used for judging whether the air pressure in the air floating shaft exceeds a first threshold value range or not, judging whether the target output air quantity exceeds a second threshold value or not, and reducing the first threshold value range when the judgment result is yes; the system has the characteristics of strong monitoring capability and high operation stability.

Description

Technical Field

[0001] This invention belongs to the field of air compressor station technology, specifically relating to an air supply system for an air compressor station driven by an air-float shaft. Background Technology

[0002] An air compressor station is a general term for equipment and assemblies that manufacture and supply compressed air. It is widely used in various fields of industry and daily life to provide compressed gas for equipment and instruments.

[0003] For the output of compressed gas, an air supply system is needed for overall planning. A typical air supply system, such as the air compressor station air supply system disclosed in Chinese Patent Publication No. CN111609315B, includes an air compressor unit; a non-purified air storage tank, which is in airflow communication with the air compressor unit; a dryer, which is in airflow communication with the non-purified air storage tank and is used to receive the airflow output from the non-purified air storage tank; an instrument air storage tank, which is in airflow communication with the dryer and is used to receive the airflow passed through the dryer; at least one air-consuming unit, which is in airflow communication with the non-purified air storage tank and the instrument air storage tank respectively and is used to receive the airflow output from them; and an air supply network, including a first main... The system includes a main road, a second main road, a third main road, a fourth main road, at least one first branch road, and at least one second branch road. The first and second main roads are connected in parallel, with one end connected to a non-purified air storage tank and the other end connected to the first branch road. The third and fourth main roads are connected in parallel, with one end connected to an instrument air storage tank and the other end connected to the second branch road. The first and second branch roads are respectively connected to the airflow of the air-consuming unit. The air pressure of the air compressor station's air supply system tends to be more stable, and there will be no situation where the local pressure is too high or the terminal pressure is too low. It can ensure normal air supply to each air-consuming unit, with short air supply response time and stable air pressure. For air compressor stations with high output air pressure, airflow stability, or high gas impurity content, air-bearing shafts with low lubricant volatility and high upper speed limits are often used as the rotating shaft of the air supply system. However, air-bearing shafts have high stability requirements and are sensitive to changes in operating conditions. For example, when the air compressor station needs to output more gas in a short period of time, the rotation speed of the air-bearing shaft is faster, and the probability of instability is higher. The above-mentioned solutions do not have a mechanism to effectively monitor the operating status of the air compressor station using the air-bearing shaft. The monitoring capability for the scenarios using the air-bearing shaft is insufficient, and the operating stability is low. Therefore, an air-bearing shaft driven air compressor station air supply system with strong monitoring capabilities and high operating stability is needed. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides an air supply system for an air compressor station driven by an air-floating shaft, which features strong monitoring capabilities and high operational stability.

[0005] The objective of this invention can be achieved through the following technical solutions: An air supply system for an air compressor station driven by an air-float shaft includes an internal monitoring module, an external monitoring module, a control module, and an air-float shaft. The internal monitoring module is used to monitor the air pressure inside the air-float shaft and upload the data to the control module. The air-float shaft is used to drive the air supply fan. The external monitoring module is used to obtain the target output gas volume of the air compressor station and upload the data to the control module. The control module is used to determine whether the air pressure inside the air-bearing shaft exceeds the first threshold range, and the control module determines whether the target output gas quantity exceeds the second threshold, and reduces the first threshold range when the determination result is yes.

[0006] As a preferred embodiment of the present invention, the internal monitoring module is used to monitor the air pressure N inside the air bearing shaft and upload it to the control module, the external monitoring module is used to obtain the target output gas quantity M of the air compressor station and upload it to the control module, the control module is pre-inputting a second threshold M0, and the control module is used to determine whether the air pressure inside the air bearing shaft exceeds the first threshold range [N1×(1+A1), N2×(1-A1)], where A1=0.5lg(x), x=1+(M-M0) / M0, M0≤M≤2M0.

[0007] As a preferred embodiment of the present invention, it further includes a gas tank, which is used to supply gas to the air-bearing shaft and to receive compressed gas from the air compressor station. The internal monitoring module is used to monitor the gas storage in the gas tank and upload the data to the control module. The control module determines whether the gas storage is lower than a third threshold and issues an alarm when the determination result is yes. The control module raises the third threshold when it determines that the target output gas quantity exceeds the range of the second threshold.

[0008] As a preferred embodiment of the present invention, the internal monitoring module is used to monitor the gas storage Q of the gas tank and upload it to the control module. The control module determines whether the gas storage Q is lower than Q0×(1-A1), where Q0 is a third threshold.

[0009] As a preferred embodiment of the present invention, the control module generates a function of the air pressure inside the air-bearing shaft changing with time, and calculates whether the area of ​​the part of the function that exceeds the standard range exceeds a fourth threshold. The control module issues an alarm when the calculation result is yes.

[0010] As a preferred embodiment of the present invention, the control module generates a function f(t) representing the change in air pressure within the air-bearing shaft over time. The portion of f(t) exceeding a standard range is denoted as g(t), and the portion below the standard range is denoted as h(t). The area M of the portion of the function exceeding the standard range is calculated, where M = + Where C and D are the upper and lower limits of the standard range.

[0011] As a preferred technical solution of the present invention, the control module generates a function f(t) of the air pressure inside the air-floating shaft changing with time to determine whether the rate of change exceeds a threshold, and further increases a third threshold when the determination result is yes.

[0012] The beneficial effects of this invention are as follows: (1) By setting up a control module to monitor the air pressure inside the air bearing shaft, and when the target output gas volume of the air compressor station is large, the load on the air bearing shaft is large, and the air film inside the air bearing shaft is more likely to rupture due to air field instability. It is necessary to more sensitively capture the changes in air pressure inside the air bearing shaft and improve the judgment standard for air pressure. At the same time, the range of the first threshold used to judge the air pressure inside the air bearing shaft is narrowed, and the judgment standard is improved. (2) By setting the air-floating shaft to supply compressed gas from the air compressor station, compared with the scheme that relies on external gas supply, the dependence on external gas and additional energy consumption are reduced, and the gas path design is simplified. (3) By enabling the control module to monitor the gas storage in the gas tank and to issue an alarm when there is a low gas level in the gas tank and there is a possibility that the gas supply to the air bearing shaft will be insufficient, the damage to the air bearing shaft caused by the gas supply stoppage is avoided. (4) By making the control module have a larger target output gas volume at the air compressor station, the load on the air float shaft is larger, and the air float shaft is more likely to be damaged when the gas supply is low and the air film is thin, the third threshold is increased, thereby increasing the judgment standard for whether the gas in the storage tank is sufficient. This makes the control module issue an alarm when there is a lot of gas in the storage tank, reducing the probability of insufficient gas supply under high load on the air float shaft. (5) By having the control module generate a function of the air pressure inside the air-floating shaft changing with time, and calculating whether the area of ​​the part of the function that exceeds the standard range exceeds the fourth threshold, compared with the single threshold judgment of real-time parameters, false alarms caused by instantaneous data acquisition deviation are avoided, and the detection accuracy of the air-floating shaft is improved. (6) By making the rate of change of the function f(t) of the air pressure in the floating shaft of the control module exceed the threshold, there is a high probability of instantaneous data acquisition deviation and the detection result is likely to fail to represent the real situation, the judgment standard for the gas storage tank is further improved, thereby further avoiding the occurrence of insufficient gas output from the gas storage tank. Attached Figure Description

[0013] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a block diagram of the control loop of the present invention. Detailed Implementation

[0015] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0016] Please see Figure 1 An air supply system for an air compressor station driven by an air bearing shaft includes an internal monitoring module, an external monitoring module, a control module, an air supply fan, and an air bearing shaft. The internal monitoring module is used to monitor the air pressure inside the air bearing shaft and upload it to the control module. The air supply fan is the core component of the supply system, and the air bearing shaft is used to drive the air supply fan. The external monitoring module is used to obtain the target output gas volume of the air compressor station and upload it to the control module. The control module is pre-inputting a first threshold range. The control module is used to determine whether the air pressure inside the air bearing shaft exceeds the first threshold range. At this time, the first threshold range is the judgment standard for judging whether the air pressure inside the air bearing shaft is normal. The control module judges whether the target output gas volume exceeds the second threshold, and reduces the first threshold range when the judgment result is yes. In this embodiment, the detection module includes at least one air pressure sensor installed in the air bearing shaft, which is used to detect the air pressure in the air bearing shaft and upload it to the control module; the target output gas volume of the air compressor station is determined by the usage requirements; the air bearing shaft serves as the output shaft of the air compressor that drives the air compressor station; When the air pressure inside the air bearing shaft exceeds the second threshold, the load on the air bearing shaft is relatively large. At this time, even a small fluctuation may cause the air film of the air bearing shaft to become unstable. By narrowing the range of the first threshold, the monitoring of the air pressure inside the air bearing shaft can be made more stringent, so that potential problems can be detected and measures can be taken more promptly. By setting up a control module to monitor the air pressure inside the air bearing shaft, and when the target output gas volume of the air compressor station is large, the load on the air bearing shaft is large, and it is necessary to be more sensitive to changes in the air pressure inside the air bearing shaft and improve the judgment standard, the range of the first threshold used to judge the air pressure inside the air bearing shaft is narrowed, thereby improving the judgment standard. In the above process, specifically, the internal monitoring module is used to monitor the air pressure N inside the air bearing shaft and upload it to the control module, the external monitoring module is used to obtain the target output gas volume M of the air compressor station and upload it to the control module, the control module is pre-inputting a second threshold M0, and the control module is used to determine whether the air pressure inside the air bearing shaft exceeds the first threshold range [N1×(1+A1), N2×(1-A1)], where A1=0.5lg(x), x=1+(M-M0) / M0, M0≤M≤2M0, N1 is the pre-input lower limit standard value of the first threshold range, and N2 is the pre-input upper limit standard value of the first threshold range; When M is large, A1 is large, and since the range of x is [1, 2], A1 is greater than or equal to 0, (1+A1) is greater than or equal to 1, and N1×(1+A1) is greater than or equal to N1. Similarly, N2×(1-A1) is less than or equal to N2. Therefore, the corrected first threshold range [N1×(1+A1), N2×(1-A1)] is smaller than the pre-input first threshold range [N1, N2], thus completing the reduction of the first threshold range. When an air-bearing shaft is installed in an air compressor station, an external gas supply is required to continuously supply the air-bearing shaft in order to maintain its operation or adjust its parameters. At this time, the air-bearing shaft often uses compressed gas produced by the air compressor station to maintain its operation. Therefore, a gas tank is also included. The gas tank is used to supply gas to the air-bearing shaft and to receive compressed gas from the air compressor station. By setting the air-bearing shaft to be supplied with compressed gas produced by the air compressor station, the dependence on external gas supply and additional energy consumption are reduced compared to the scheme that relies on external gas supply, and the gas path design is simplified.

[0017] During operation, the air supply source of the air-float shaft needs to be detected. The stability of the air supply source determines the operating stability of the air-float shaft. Therefore, the internal monitoring module is used to monitor the gas storage in the gas tank and upload it to the control module. The control module determines whether the gas storage is lower than the third threshold and issues an alarm when the result is yes. When the control module determines that the target output gas volume exceeds the range of the second threshold, it raises the third threshold. By enabling the control module to monitor the gas level in the gas tank and issue an alarm when the gas level in the tank is low and there is a possibility that the air bearing shaft cannot be supplied with sufficient gas, damage to the air bearing shaft caused by the cessation of gas supply is avoided.

[0018] Meanwhile, the air bearing shaft is under a large load, and it is more likely to be damaged when the air supply is reduced. At this time, it is necessary to improve the judgment standard for whether the gas in the gas tank is sufficient. To this end, the internal monitoring module is used to monitor the gas storage Q of the gas tank and upload it to the control module. The control module judges whether the gas storage Q is lower than Q0×(1-A1), where Q0 is the third threshold. When M is large, the load on the air-floating shaft is large, A1 is large and greater than 0, Q0×(1-A1) is less than Q0, and the gas storage judgment value Q0×(1-A1) is reduced. By increasing the target output gas volume required by the air compressor station, which places a greater load on the air bearing shaft and increases the likelihood of damage when the air bearing shaft is damaged due to reduced gas supply, the third threshold is raised. This raises the standard for judging whether the gas in the storage tank is sufficient, so that the control module will issue an alarm when there is a lot of gas in the storage tank, reducing the probability of insufficient gas supply under high load on the air bearing shaft. The control module generates a function of the air pressure inside the air-bearing shaft changing over time, and calculates whether the area of ​​the part of the function that exceeds the standard range exceeds the fourth threshold. The control module issues an alarm when the calculation result is yes. The control module generates a function f(t) representing the change in air pressure within the air-bearing shaft over time. The portion of f(t) exceeding a first threshold range is denoted as g(t), and the portion below the first threshold range is denoted as h(t). The control module then calculates the area M of the portion of the function that exceeds the standard range, where M = + t0 is the pre-input collected value; For example, assuming N1=5 and N2=10, the portion of f(t) exceeding 10 is extracted separately and denoted as g(t), and the portion below 5 is extracted separately and denoted as h(t). Since the function f(t) does not exceed N2 or fall below N1 at every moment, the time the function is within the first threshold range is denoted as g(t)=10. =0, h(t) is denoted as h(t)=5. =0, and and All are continuously integrable; When a false alarm occurs due to a momentary data acquisition error... The h(t) graph may show a peak shape, with high instantaneous values ​​but low integral values, which reduces the probability of triggering an early warning and lowers the false alarm rate. By having the control module generate a function showing the change of air pressure within the air-bearing shaft over time, and calculating whether the area of ​​the portion of the function that exceeds the standard range exceeds the fourth threshold, false alarms caused by instantaneous data acquisition deviations are avoided compared to judging based on a single threshold of real-time parameters, thus improving the detection accuracy of the air-bearing shaft.

[0019] When the above system is running, there is a probability that the rate of change of the air pressure axis is large. This may indicate that there is a data acquisition deviation. The data acquired at this time may not be able to detect whether the air output of the air tank is insufficient. It is necessary to more strictly prevent insufficient air output of the air tank. To this end, the control module generates a function f(t) of the air pressure in the air float axis changing with time to check whether the rate of change exceeds a threshold. If the judgment result is yes, the third threshold is further increased.

[0020] By making the rate of change of the function f(t) of air pressure in the floating shaft exceed the threshold, there is a high probability of instantaneous data acquisition deviation. When the detection result is likely to fail to represent the real situation, the judgment standard for the air storage tank is further improved, thereby further avoiding the occurrence of insufficient air output from the air storage tank.

[0021] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A gas floating shaft driven air compression station air supply system, characterized in that: The air float shaft is used for driving the air supply fan, and the external monitoring module is used for obtaining a target output gas amount of the air compression station and uploading the target output gas amount to the control module. The control module is used for judging whether the air pressure in the air float shaft exceeds a first threshold range, judging whether the target output gas amount exceeds a second threshold, and reducing the first threshold range when the judgment result is yes.

2. The air supply system of claim 1, wherein: The internal monitoring module is used for monitoring the air pressure N in the air float shaft and uploading the air pressure N to the control module, the external monitoring module is used for obtaining a target output gas amount M of the air compression station and uploading the target output gas amount M to the control module, and the control module is previously input with a second threshold M0.

3. The air supply system of claim 2, wherein: The gas tank is used for supplying air to the air float shaft, the gas tank is used for receiving compressed gas from the air compression station, the internal monitoring module is used for monitoring the gas storage of the gas tank and uploading the gas storage to the control module, the control module is used for judging whether the gas storage is lower than a third threshold, and issuing an alarm when the judgment result is yes, and the control module is used for increasing the third threshold when the target output gas amount exceeds the second threshold range.

4. The air supply system of claim 3, wherein: The internal monitoring module is used for monitoring the gas storage Q of the gas tank and uploading the gas storage Q to the control module, and the control module is used for judging whether the gas storage Q is lower than Q0×(1-A1), where Q0 is the third threshold.

5. The air supply system of claim 1, wherein: The control module generates a function of the air pressure in the air float shaft changing with time, calculates whether an area of a part of the function exceeding a standard range exceeds a fourth threshold, and issues an alarm when the calculation result is yes.

6. The air supply system of claim 5, wherein: The control module generates a function f(t) of the air pressure in the air-floating shaft over time, the part of f(t) exceeding the standard range is recorded as g(t), and the part of f(t) below the standard range is recorded as h(t), calculates the area M of the part of the function exceeding the standard range, M= + where C and D are the upper and lower limits of the standard range.

7. The air supply system of claim 6, wherein: The control module generates a function f(t) of the air pressure in the air float shaft changing with time, judges whether a change rate of the function f(t) exceeds a threshold, and further increases the third threshold when the judgment result is yes.

Images