Air floating shaft driven air compression station air supply system

Abstract

The application relates to an air-float shaft driven air compression station air supply system, belonging to the technical field of air compression stations, which comprises an internal monitoring module, an external monitoring module, a control module and an air-float shaft, the internal monitoring module is used for monitoring the air pressure in the air-float shaft and uploading to the control module, the air-float shaft is used for driving an air supply fan, and the external monitoring module is used for acquiring the target output gas volume of the air compression station and uploading 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, the control module judges whether the target output gas volume exceeds a second threshold, and the first threshold range is reduced when the judgment result is yes; the system has the characteristics of strong monitoring capacity and high operation stability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air compression stations, and particularly relates to an air-float-shaft-driven air compression station air supply system. BACKGROUND

[0002] An air compression station is a general term for devices and combinations thereof for manufacturing and providing compressed air, which is widely used in various fields of industry and production and life to provide compressed air for devices and instruments.

[0003] For the output of compressed air, an air supply system is needed to plan as a whole. A general air supply system, such as the air compression station air supply system disclosed in Chinese Patent No. CN111609315B, comprises an air compression unit; a non-purified air storage tank in airflow communication with the air compression unit; a dryer in airflow communication with the non-purified air storage tank and used to receive the airflow output from the non-purified air storage tank; an instrument air storage tank in airflow communication with the dryer and used to receive the airflow through the dryer; at least one air-consuming unit in airflow communication with the non-purified air storage tank and the instrument air storage tank respectively and used to receive the airflow output therefrom; and an air supply pipe network comprising a first main line, a second main line, a third main line, a fourth main line, at least one first branch line and at least one second branch line. The first main line and the second main line are arranged in parallel and one end of each is in communication with the non-purified air storage tank and the other end is in communication with the first branch line. The third main line and the fourth main line are arranged in parallel and one end of each is in communication with the instrument air storage tank and the other end is in communication with the second branch line. The first branch line and the second branch line are in airflow communication with the air-consuming unit respectively. The pressure of the air compression station air supply system tends to be more stable, and the situation of local over-high pressure and low-end pressure does not occur, which can guarantee normal air supply of each air-consuming unit, short air supply response time and stable air pressure.

[0004] For an air compression station with high air pressure, airflow stability or high gas impurity content, a gas-float-shaft with low lubricating oil volatility and high upper limit of rotational speed is often used as the rotating shaft of the air supply system. The gas-float-shaft has high requirements for stability and is sensitive to working conditions. For example, when the air compression station needs to output more gas in a short time, the rotational speed of the gas-float-shaft is high, and the probability of instability of the gas-float-shaft is high at this time. In the above scheme, a mechanism similar to this is not provided to effectively monitor the running status of the air compression station itself, and the monitoring ability of the scene using the gas-float-shaft is insufficient, and the running stability is low. Therefore, an air-float-shaft-driven air compression station air supply system with strong monitoring ability and high running stability is needed. SUMMARY

[0005] To solve the above problems in the prior art, the application provides an air-float-shaft-driven air compression station air supply system, which has the characteristics of strong monitoring ability and high running stability.

[0006] The object of the present application can be achieved by the following technical solutions:

[0007] The air floating shaft driven air compression station air supply system comprises an internal monitoring module, an external monitoring module, a control module and an air floating shaft, the internal monitoring module is used for monitoring the air pressure in the air floating shaft and uploading to the control module, the air floating shaft is used for driving an air supply fan, and the external monitoring module is used for obtaining a target output gas amount of the air compression station and uploading to the control module.

[0008] The control module is used for judging whether the air pressure in the air floating 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.

[0009] As a preferred technical solution of the present application, the internal monitoring module is used for monitoring the air pressure N in the air floating shaft and uploading to the control module, the external monitoring module is used for obtaining the target output gas amount M of the air compression station and uploading to the control module, the control module is pre-inputted with a second threshold M0, the control module is used for judging whether the air pressure in the air floating shaft exceeds a first threshold range [N1×(1+A1), N2×(1-A1)], wherein A1=0.5lg(x), x=1+(M-M0) / M0, M0≤M≤2M0.

[0010] As a preferred technical solution of the present application, it further comprises a gas tank, the gas tank is used for supplying gas to the air floating 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 to the control module, the control module judges whether the gas storage is lower than a third threshold and issues an alarm when the judgment result is yes, and the control module increases the third threshold when the target output gas amount exceeds the second threshold range.

[0011] As a preferred technical solution of the present application, the internal monitoring module is used for monitoring the gas storage Q of the gas tank and uploading to the control module, and the control module judges whether the gas storage Q is lower than Q0×(1-A1), wherein Q0 is the third threshold.

[0012] As a preferred technical solution of the present application, the control module generates a function of the air pressure in the air floating shaft changing with time, and calculates whether the area of the part of the function exceeding a standard range exceeds a fourth threshold, and the control module issues an alarm when the calculation result is yes.

[0013] As a preferred technical solution of the present application, the control module generates a function f(t) of the air pressure in the air floating shaft changing with time, the part exceeding the standard range in f(t) is recorded as g(t), and the part below the standard range is recorded as h(t), the area S of the part of the function exceeding the standard range is calculated, S= + wherein C and D are upper and lower limits of a standard range.

[0014] As a preferred technical solution of the present application, the control module generates a rate of change of the function f(t) of the air pressure in the air-floating shaft over time, and further increases the third threshold value when the result of the judgment is yes.

[0015] The present application has the following beneficial effects:

[0016] (1) By setting the control module to monitor the air pressure in the air-floating shaft, and when the target output gas amount of the air compression station is large, the load on the air-floating shaft is large, and the air film in the air-floating shaft has a greater probability of rupture caused by unstable air field, it is necessary to more sensitively capture the change of the air pressure in the air-floating shaft and improve the judgment standard for the air pressure, thereby reducing the range of the first threshold value for judging the air pressure in the air-floating shaft and improving the judgment standard.

[0017] (2) By setting the air-floating shaft to be supplied with compressed gas produced by the air compression station, compared with the scheme relying on external gas supply, the dependence on external gas and additional energy consumption is reduced, and the gas path design is simplified.

[0018] (3) By having the control module monitor the gas storage of the gas tank, and when the gas in the gas storage tank is less, there is a probability that the air-floating shaft cannot be supplied with sufficient gas, the damage of the air-floating shaft caused by the stop of the air supply is avoided.

[0019] (4) By having the control module increase the third threshold value when the target output gas amount of the air compression station is large, the load on the air-floating shaft is large, and the air-floating shaft has a greater probability of damage under the condition of low gas supply and thin air film, and further improve the judgment standard of whether the gas in the gas storage tank is sufficient, so that the control module issues an alarm when the gas in the gas storage tank is more, and the probability of insufficient gas supply of the air-floating shaft under high load is reduced.

[0020] (5) By having the control module generate a function of the air pressure in the air-floating shaft over time, and calculate whether the area of the part of the function exceeding the standard range exceeds the fourth threshold value, compared with the single threshold value judgment of real-time parameters, false alarms caused by instantaneous data collection deviation are avoided, and the detection accuracy of the air-floating shaft is improved.

[0021] (6) By having the control module further increase the judgment standard of the gas storage tank when the rate of change of the function f(t) of the air pressure in the air-floating shaft over time exceeds the threshold value, there is a greater probability of instantaneous data collection deviation, and the detection result has a greater probability of not representing the true situation, thereby further avoiding the occurrence of insufficient gas output of the gas storage tank. BRIEF DESCRIPTION OF DRAWINGS

[0022] For the convenience of those skilled in the art to understand, the present application is further described below in conjunction with the drawings.

[0023] Figure 1 The control circuit block diagram of the present application. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined application purposes, the specific embodiments, structures, features and effects according to the present application are described in detail below in conjunction with the drawings and preferred embodiments.

[0025] Please refer to Figure 1 A gas floating shaft driven air compression station air supply system, comprising an internal monitoring module, an external monitoring module, a control module, an air supply fan and a gas floating shaft, the internal monitoring module is used for monitoring the gas pressure in the gas floating shaft and uploading to the control module, the air supply fan is the core component of the air supply system, the gas floating shaft is used for driving the air supply fan, the external monitoring module is used for obtaining the target output gas quantity of the air compression station and uploading to the control module;

[0026] The control module has a first threshold range input in advance, the control module is used for judging whether the gas pressure in the gas floating shaft exceeds the first threshold range, at this time the first threshold range is the judgment standard for judging whether the gas pressure in the gas floating shaft is normal, the control module judges whether the target output gas quantity exceeds the second threshold, and narrows the first threshold range when the judgment result is yes;

[0027] In this embodiment, the detection module at least includes a gas pressure sensor arranged in the gas floating shaft, which is used for detecting the gas pressure in the gas floating shaft and uploading to the control module; the target output gas quantity of the air compression station is determined by the use requirement; the gas floating shaft is used as the output shaft of the air compressor for driving the air compression station;

[0028] When the gas pressure in the gas floating shaft exceeds the second threshold, the load of the gas floating shaft is larger, and the load of the gas floating shaft is larger, at this time the slight fluctuation may cause the gas film of the gas floating shaft to be unstable, by narrowing the first threshold range, the monitoring of the gas pressure in the gas floating shaft is more strict, so that the potential problems can be found more timely and measures can be taken;

[0029] By setting the control module to monitor the gas pressure in the gas floating shaft, and when the target output gas quantity required to be output by the air compression station is large, the load of the gas floating shaft is large, and the gas pressure in the gas floating shaft needs to be more sensitive to the change of the gas pressure to improve the judgment standard of the gas pressure, the range of the first threshold for judging the gas pressure in the gas floating shaft is narrowed, and the judgment standard is improved;

[0030] In the above process, specifically, the internal monitoring module is configured to monitor the air pressure N in the air float shaft and upload the air pressure N to the control module, the external monitoring module is configured to obtain the target output gas amount M of the air compression station and upload the target output gas amount M to the control module, the control module is pre-inputted with a second threshold M0, the control module is configured to determine whether the air pressure in the air float shaft exceeds a first threshold range [N1×(1+A1), N2×(1-A1)], where A1=0.5lg(x), x=1+(M-M0) / M0, M0≤M≤2M0, N1 is a pre-inputted lower limit standard value of the first threshold range, and N2 is a pre-inputted upper limit standard value of the first threshold range;

[0031] When M is large, A1 is large, and since the value range of x is [1, 2], A1 is greater than or equal to 0, (1+A1) is greater than or equal to 1, N1×(1+A1) is greater than or equal to N1, and similarly, N2×(1-A1) is less than or equal to N2, so the first threshold range [N1×(1+A1), N2×(1-A1)] after correction is smaller than the pre-inputted first threshold range [N1, N2], and the reduction of the first threshold range is completed.

[0032] When the air compression station sets the air float shaft, external gas needs to be supplied to the air float shaft to maintain the operation of the air float shaft or adjust the parameters of the air float shaft, at this time, the air float shaft often uses the compressed gas produced by the air compression station to maintain its own operation, and therefore, the gas tank is further included, and the gas tank is configured to supply gas to the air float shaft, and the gas tank is configured to receive compressed gas from the air compression station.

[0033] By setting the air float shaft to be supplied with compressed gas produced by the air compression station, compared with the scheme of relying on external gas supply, the dependence on external gas and the additional energy consumption are reduced, and the gas path design is simplified.

[0034] During operation, the source of gas supply to the air float shaft needs to be detected, and the stability of the source of gas supply determines the stability of the operation of the air float shaft, and therefore, the internal monitoring module is configured to monitor the gas storage of the gas tank and upload the gas storage to the control module, the control module is configured to determine whether the gas storage is lower than a third threshold, and when the determination result is yes, the control module is configured to issue an alarm, and the control module is configured to increase the third threshold when the target output gas amount exceeds the second threshold range.

[0035] By making the control module monitor the gas storage of the gas tank, and issuing an alarm when the gas in the gas tank is less and there is a probability that the air float shaft cannot be supplied with sufficient gas, damage to the air float shaft caused by the stop of gas supply to the air float shaft is avoided.

[0036] Meanwhile, the load of the air float shaft is large, and the air float shaft is more likely to be damaged when the air supply is reduced, at this time, the judgment standard of whether the gas in the gas tank is sufficient needs to be improved, for this, the internal monitoring module is used to monitor the gas storage Q of the gas tank and upload to the control module, the control module judges whether the gas storage Q is lower than Q0×(1-A1), wherein Q0 is the third threshold value;

[0037] When M is large, the load of the air float shaft is large, A1 is large and greater than 0, Q0×(1-A1) is less than Q0, the reduction of the gas storage judgment value Q0×(1-A1) is completed;

[0038] By making the control module when the air pressure station needs to output the target output gas quantity is large, the load of the air float shaft is large, the air float shaft is more likely to be damaged when the air supply is reduced, the third threshold value is improved, and then the judgment standard of whether the gas in the gas tank is sufficient is improved, so that the control module issues an alarm when the gas in the gas tank is more, and the probability of insufficient air supply under high load of the air float shaft is reduced;

[0039] The control module generates a function of the air pressure in the air float shaft changing with time, and calculates whether the area of the part exceeding the standard range of the function exceeds the fourth threshold value, and the control module issues an alarm when the calculation result is yes;

[0040] The control module generates a function f(t) of the air pressure in the air float shaft changing with time, the part exceeding the first threshold value range in f(t) is recorded as g(t), and the part below the first threshold value range is recorded as h(t), then the control module calculates the area S of the part exceeding the standard range of the function, wherein S= + , t0 is a pre-input collection value;

[0041] For example, assuming that N1=5 and N2=10, the part of f(t) exceeding 10 is taken out separately and recorded as g(t), and the part below 5 is taken out separately and recorded as h(t), and since the function f(t) does not exceed N2 or below N1 every moment, the time when the function is in the first threshold value range, g(t) is recorded as g(t)=10, at this time =0, h(t) is recorded as h(t)=5, =0, and And are continuously integrable;

[0042] When the false alarm caused by the deviation of instantaneous data collection occurs, Or the image of h(t) is sharp, the instantaneous value is high but the integral value is low, the probability of triggering the early warning is low, and the false alarm rate is reduced;

[0043] By making the control module generate a function of the air pressure in the air float shaft changing over time, and calculating whether the area of the part of the function exceeding the standard range exceeds a fourth threshold value, compared to the single threshold value judgment of real-time parameters, false alarms caused by transient data acquisition deviation are avoided, and the detection accuracy of the air float shaft is improved.

[0044] When the system is running, there is a probability that the air pressure shaft change rate will be large, at which time there is a probability that data acquisition deviation has occurred, and the data collected at this time may not be able to monitor whether the gas output of the gas storage tank is insufficient, and more stringent precautions against insufficient gas output of the gas storage tank are needed. To this end, the control module generates a function f(t) of the change rate of the air pressure in the air float shaft changing over time, and further increases the third threshold value when the judgment result is yes.

[0045] When the change rate of the function f(t) of the air pressure in the air float shaft changing over time exceeds the threshold value, there is a high probability that transient data acquisition deviation will occur, and the detection result has a high probability that it cannot represent the true situation. Further increase the judgment standard for the gas storage tank, and further avoid the occurrence of insufficient gas output of the gas storage tank.

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 to the control module. The control module is used for judging whether the air pressure in the air float shaft exceeds the first threshold range, judging whether the target output gas amount exceeds the second threshold, and reducing the first threshold range when the target output gas amount exceeds the second threshold. The internal monitoring module is used for monitoring the air pressure N in the air float shaft and uploading 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 to the control module, the control module is previously input with a second threshold M0, the control module is used for judging whether the air pressure in the air float shaft exceeds the first threshold range [N1×(1+A1), N2×(1-A1)], wherein A1=0.5lg(x), x=1+(M-M0) / M0, M0≤M≤2M0, N1 is a lower limit standard value of the first threshold range input in advance, and N2 is an upper limit standard value of the first threshold range input in advance. 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 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.

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

3. 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 the area of the part of the function exceeding the standard range exceeds a fourth threshold, and issues an alarm when the calculation result is yes.

4. The air supply system of claim 3, 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 S of the part of the function exceeding the standard range, S= + where C and D are the upper and lower limits of the standard range.

5. The air supply system of claim 4, wherein: The control module generates a function f(t) of the air pressure in the air float shaft changing with time, judges whether the change rate of the function f(t) exceeds a threshold, and further increases the third threshold when the judgment result is yes.

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