Control method for maintaining pressure stability of air compressor

Abstract

The invention relates to a control method for maintaining the pressure stability of an air compressor, which comprises the following steps that: a controller counts the total instant air volume of a plurality of air volume user sides, counts the average instant total air volume in a set time period, and multiplies the average instant total air volume by a corresponding coefficient on the basis to obtain the basic air supply volume of the air compressor; the environment temperatures of all air volume user sides are collected and averaged, the average temperature value of the user sides is obtained, the temperature value of an air inlet pipeline of an air compressor and the environment temperature in an air compression room are collected, a controller calculates the difference value and the simple average value, and corresponding judgment is conducted to determine whether the coolant supply amount is adjusted or not. According to the technical scheme, the supply amount of the coolant is correspondingly adjusted by monitoring the working environment of the user side, the temperature value of the air inlet pipeline of the air compressor and the environment temperature in the air compression room, so that the stability of the working environment of the air compressor is maintained, it is guaranteed that the air volume of the air supply end is stable, and corresponding energy consumption is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of energy saving in tobacco factories, and in particular relates to a control method for maintaining stable pressure of an air compressor. Background Art

[0002] In the manufacturing process of cigarettes, there are multiple processes that require air, which is usually achieved by using air compressors to supply air. In the production process, the air consumption is large, and each process has strict requirements on the stability of the air volume. In order to ensure the stability of the air supply, the air compressor usually supplies air within a certain range that exceeds the total required air volume, so the air compressor needs to have a large workload. During the operation of the air compressor, a large amount of heat will be generated. In order to ensure the stable operation of the air compressor, the heat generated by the air compressor needs to be removed.

[0003] On the other hand, when the temperature of the air compressor's surrounding environment changes significantly, the amount of air sucked by the air compressor during operation will change, which will also cause the air supply of the air compressor to be unstable, requiring the air compressor to increase its power, resulting in increased energy consumption of the air compressor. Summary of the invention

[0004] The object of the present invention is to provide a control method for maintaining stable pressure of an air compressor, so as to solve the problems of high energy consumption, heat loss and unstable air supply volume existing in the above-mentioned background technology.

[0005] To achieve the above objectives, this application is implemented through the following technical solutions: A control method for maintaining stable pressure of an air compressor comprises the following steps: S1. The instant air volume used by multiple air volume users is transmitted to the controller, and the controller aggregates the instant air volume used by each air volume user to obtain the total instant air volume used by the air volume users; S2. The controller counts the average instant total air volume during the set time period, and multiplies the average instant total air volume by a corresponding coefficient to obtain the basic air supply volume P of the air compressor; S3, collecting the ambient temperature of each air volume user end and averaging them to obtain the average temperature value T1 of the user end, collecting the temperature value T2 of the air compressor intake duct and the ambient temperature T3 in the air compressor room; S4, the controller calculates the difference M1 of T2-T1, the simple average T0 of T1 and T2, the difference H1 of T3-T0, and determines that if the value of M1 is within the set range and the value of H1 is within the set range, the controller does not send a control signal; If the value of M1 is less than the minimum value of the set range and the value of H1 is within the set range, the controller sends a control signal to the coolant supply system to reduce the supply of coolant; If the value of M1 is greater than the maximum value of the set range and the value of H1 is within the set range, the controller sends a control signal to the coolant supply system to increase the supply of coolant; If the value of M1 is within the set range and the value of H1 is less than the minimum value of the set range, the controller sends a control signal to the coolant supply system to reduce the supply of coolant; If the value of M1 is within the set range and the value of H1 is greater than the maximum value of the set range, the controller sends a control signal to the coolant supply system to increase the supply of coolant.

[0006] Furthermore, in step S1, it is determined that the ratio of the total instant air volume used by the air volume users to the instant air volume supplied by the air compressor is between 0.75-0.95. If the ratio is less than 0.75, the controller sends an air leakage alarm.

[0007] Furthermore, in step S2, the average instantaneous total air volume is multiplied by a corresponding coefficient to obtain a basic air supply volume P of the air compressor, and the coefficient is 1.1-1.5.

[0008] Furthermore, in step S3, the ambient temperatures of the user terminals of each air volume are collected and averaged to obtain an average temperature value T1 of the user terminal, which is a simple average of the ambient temperatures of the user terminals of each air volume collected at the same time. The ambient temperature here is the working ambient temperature.

[0009] Furthermore, in step S4, if the value of M1 is within the set range and the value of H1 is less than the minimum value of the set range, the controller sends a control signal to the coolant supply system to reduce the coolant supply by 3-10% based on the current coolant supply.

[0010] Furthermore, in step S4, if the value of M1 is within the set range and the value of H1 is greater than the maximum value of the set range, the controller sends a control signal to the coolant supply system, and based on the current coolant supply, the coolant supply is increased by 1-3% for every 2°C increase in H1.

[0011] Furthermore, in step S4, if the value of M1 is within the set range and the value of H1 is greater than the maximum value of the set range, the controller does not send a control signal to the coolant supply system, and the controller sends a control signal to the exhaust fan in the air compressor room to increase the exhaust volume.

[0012] The beneficial effects of the present invention are: This technical solution monitors the working environment of the user end, the temperature value of the air compressor inlet duct and the ambient temperature in the air compressor room, and adjusts the supply of coolant accordingly to maintain the stability of the working environment of the air compressor, ensure the stability of the air volume at the air supply end, and reduce the corresponding energy consumption. DETAILED DESCRIPTION

[0013] The technical solution of the present invention is described in detail below. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.

[0014] This technical solution adjusts the coolant supply of the air compressor accordingly based on the changes in the working environment temperature at the air volume user end and the temperature of the air compressor room and the air intake duct, so as to ensure that the air volume provided by the air compressor is relatively stable, thereby achieving energy saving and ensuring the stability of the air volume at the user end.

[0015] The present application provides a control method for maintaining stable pressure of an air compressor, comprising the following steps: S1. The instant air volume used by multiple air volume user terminals is transmitted to the controller, and the controller aggregates the instant air volume used by each air volume user terminal to obtain the total instant air volume used by the air volume users; in the technical solution of the present application, this is achieved by setting air volume sensors at the air outlets of all air volume user terminals.

[0016] Determine that the ratio of the total instant air volume used by air volume users to the instant air volume supplied by the air compressor is between 0.75-0.95. If the ratio is less than 0.75, the controller sends an air leakage alarm. The technical solution of the present application is applicable to the above-mentioned situation where the ratio of the total instant air volume used by air volume users to the instant air volume supplied by the air compressor is between 0.75-0.95. Of course, the same applies to the case where the ratio is close to 1. However, it is difficult for the current air supply system to achieve a ratio greater than 0.95. If the ratio is greater than 0.95, the technical solution of the present application is also applicable. When the ratio is lower than 0.75, it means that the air supply system is leaking seriously. At this time, it is no longer a question of maintaining the air compressor pressure stable and reducing energy consumption, because the air leakage has made the technology of reducing energy consumption meaningless. The first thing to solve is to reduce or control the air leakage problem.

[0017] S2. The controller counts the average instant total air volume in the set time period, and multiplies the average instant total air volume by a corresponding coefficient to obtain the basic air supply volume P of the air compressor; in the technical solution of the present application, the set time period can be arbitrarily selected as needed, such as 5 minutes, 15 minutes, 30 minutes, 60 minutes, 90 minutes, 120 minutes, etc. or other time periods can all be applicable to the technical solution of the present application. The coefficient of the basic air supply volume P of the air compressor obtained by multiplying the average instant total air volume by a corresponding coefficient is 1.1-1.5. The smaller the coefficient, the higher the applicability of the present technical solution.

[0018] S3, collect the ambient temperature of each air volume user end and average it to obtain the average temperature value T1 of the user end, collect the temperature value T2 of the air compressor intake duct and the ambient temperature T3 in the air compressor room; the ambient temperature of the user end in this step does not refer to the external ambient temperature, but refers to the working environment of the user end, which refers to the temperature of the place where the air-using equipment is located. Collect the ambient temperature of each air volume user end and average it to obtain the average temperature value T1 of the user end, which is a simple average of the ambient temperatures of each air volume user end collected at the same time.

[0019] S4, the controller calculates the difference M1 of T2-T1, the simple average T0 of T1 and T2, the difference H1 of T3-T0, and determines that if the value of M1 is within the set range and the value of H1 is within the set range, the controller does not send a control signal; If the value of M1 is less than the minimum value of the set range and the value of H1 is within the set range, the controller sends a control signal to the coolant supply system to reduce the supply of coolant; If the value of M1 is greater than the maximum value of the set range and the value of H1 is within the set range, the controller sends a control signal to the coolant supply system to increase the supply of coolant; If the value of M1 is within the set range and the value of H1 is less than the minimum value of the set range, the controller sends a control signal to the coolant supply system to reduce the supply of coolant; If the value of M1 is within the set range and the value of H1 is greater than the maximum value of the set range, the controller sends a control signal to the coolant supply system to increase the supply of coolant.

[0020] In step S4, if the value of M1 is within the set range and the value of H1 is less than the minimum value of the set range, the controller sends a control signal to the coolant supply system to reduce the coolant supply by 3-10% based on the current coolant supply.

[0021] When controlling the coolant supply to decrease, first reduce the coolant supply by 3%, and then monitor the subsequent change trend of H1. If the H1 value is still less than the minimum value of the set range, but the H1 value is continuously increasing, maintain the current coolant supply that has been reduced by 3% without adjustment. If the H1 value remains unchanged or continues to decrease, continue to reduce the coolant supply. Each reduction is 3-10% of the current coolant supply. In order to monitor the change trend of H1, after each adjustment of the coolant supply, the set time should be monitored to determine whether subsequent adjustments are required. This monitoring set time is usually greater than 5 minutes.

[0022] In step S4, if the value of M1 is within the set range and the value of H1 is greater than the maximum value of the set range, the controller sends a control signal to the coolant supply system, and based on the current coolant supply, the coolant supply is increased by 1-3% for every 2°C increase in H1. This step is similar to the above control of reducing the coolant supply. Specifically, if the value of H1 is greater than the maximum value of the set range by a multiple of 2°C, when it is less than 1 times, it is calculated as 1 times, that is, the maximum value of the set range of H1 is K, and the value of H1-K is T. When T≤2°C, the controller controls the coolant supply to increase by 1-3%. If T≯2°C, for example, when it is 3°C, the coolant supply is increased by twice 1-3%. More specifically, for example, the coolant supply is increased by 2% each time, and when the value of T is 3°C, the coolant supply is directly increased by 4%.

[0023] Then monitor the subsequent change trend of H1. If the value of H1 is still greater than the maximum value of the set range, but the value of H1 is continuously decreasing, maintain the current coolant supply that has increased by 1-3% without adjustment. If the value of H1 remains unchanged or continues to increase, continue to increase the coolant supply. Each increase is 1-3% of the current coolant supply. In order to monitor the change trend of H1, after each adjustment of the coolant supply, the set time should be monitored to determine whether subsequent adjustments are required. This monitoring set time is usually greater than 5 minutes.

[0024] In step S4, if the value of M1 is within the set range and the value of H1 is greater than the maximum value of the set range, the controller does not send a control signal to the coolant supply system, and the controller sends a control signal to the exhaust fan in the air compressor room to increase the exhaust volume to reduce the temperature of the air compressor room.

[0025] The above embodiments illustrate the principles, features and effects of the present invention in detail. The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any changes made in accordance with the concept of the present invention or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the specification, should be within the scope of protection of the present invention.

Claims

1. A control method for maintaining stable pressure of an air compressor, characterized in that: The following steps are involved: S1. The instant air volume used by multiple air volume users is transmitted to the controller, and the controller aggregates the instant air volume used by each air volume user to obtain the total instant air volume used by the air volume users; S2. The controller counts the average instant total air volume during the set time period, and multiplies the average instant total air volume by a corresponding coefficient to obtain the basic air supply volume P of the air compressor; S3, collecting the ambient temperature of each air volume user end and averaging them to obtain the average temperature value T1 of the user end, collecting the temperature value T2 of the air compressor intake duct and the ambient temperature T3 in the air compressor room; S4, the controller calculates the difference M1 of T2-T1, the simple average T0 of T1 and T2, the difference H1 of T3-T0, and determines that if the value of M1 is within the set range and the value of H1 is within the set range, the controller does not send a control signal; If the value of M1 is less than the minimum value of the set range and the value of H1 is within the set range, the controller sends a control signal to the coolant supply system to reduce the supply of coolant; If the value of M1 is greater than the maximum value of the set range and the value of H1 is within the set range, the controller sends a control signal to the coolant supply system to increase the supply of coolant; If the value of M1 is within the set range and the value of H1 is less than the minimum value of the set range, the controller sends a control signal to the coolant supply system to reduce the supply of coolant; If the value of M1 is within the set range and the value of H1 is greater than the maximum value of the set range, the controller sends a control signal to the coolant supply system to increase the supply of coolant.

2. The control method for maintaining air compressor pressure stability according to claim 1, characterized in that: In step S1, it is determined that the ratio of the total instant air volume used by air volume users to the instant air volume supplied by the air compressor is between 0.75-0.

95. If the ratio is less than 0.75, the controller sends an air leakage alarm.

3. The control method for maintaining stable air compressor pressure according to claim 1, characterized in that: In step S2, the average instantaneous total air volume is multiplied by a corresponding coefficient to obtain a basic air supply volume P of the air compressor, and the coefficient is 1.1-1.

5.

4. The control method for maintaining stable air compressor pressure according to claim 1, characterized in that: In step S3, the ambient temperatures of the user terminals of each air volume are collected and averaged to obtain an average temperature value T1 of the user terminal, which is a simple average of the ambient temperatures of the user terminals of each air volume collected at the same time. The ambient temperature here is the working ambient temperature.

5. The control method for maintaining stable pressure of an air compressor according to claim 1, characterized in that: In step S4, if the value of M1 is within the set range and the value of H1 is less than the minimum value of the set range, the controller sends a control signal to the coolant supply system to reduce the coolant supply by 3-10% based on the current coolant supply.

6. The control method for maintaining stable pressure of an air compressor according to claim 5, characterized in that: In step S4, if the value of M1 is within the set range and the value of H1 is greater than the maximum value of the set range, the controller sends a control signal to the coolant supply system. Based on the current coolant supply, the coolant supply is increased by 1-3% for every 2°C increase in H1.

7. The control method for maintaining stable pressure of an air compressor according to claim 6, characterized in that: In step S4, if the value of M1 is within the set range and the value of H1 is greater than the maximum value of the set range, the controller does not send a control signal to the coolant supply system, and the controller sends a control signal to the exhaust fan in the air compressor room to increase the exhaust volume.