CN103821720A - Timing method of working time of screw compressor unit oil removing system of large-scale helium refrigerator - Google Patents

Abstract

The invention discloses a timing method and a timer for the working time of the oil removal system of a screw compressor unit of a large-scale helium refrigerator. The timing method uses a single-chip microcomputer to collect and display in real time the flow sensor of helium passing through the oil removal system of the compressor and recording, and has an alarm function at the same time; the timer includes a flowmeter arranged on the pipeline of the compressor oil removal system, an acquisition circuit for collecting the output signal of the flowmeter, a single-chip microcomputer, a display circuit and an alarm circuit, and the input terminal of the acquisition circuit is connected to the flowmeter. The output end, the output end of the acquisition circuit is connected to the digital/analog conversion port of the single-chip microcomputer, and the display circuit and the alarm circuit are connected with the single-chip microcomputer. The invention calculates the working time of the oil removal system according to the flow rate of the oil removal system, more effectively improves the utilization rate of the oil removal system equipment, and ensures the stable operation of the large helium refrigerator system and the safety of key equipment.

Description

Timing method of working time of degreasing system of screw compressor unit of large helium refrigerator

technical field

  The invention relates to a working time timing method and a timer for a large-scale helium screw compressor degreasing system, in particular to an electronically controlled timer for displaying and recording the working time of the screw compressor degreasing system of a large helium refrigerator system.

Background technique

It is generally required to use high-purity helium in large-scale helium refrigerator systems, and the sources of impurities in compressed helium mainly include: supplementary impurities in helium; the impact of back-diffusion; the newly installed inner wall of the pipeline to degas; Lubricating oil degassing; degassing caused by incomplete regeneration of the adsorber; impurities infiltrated into helium when using a wet gas holder; pollution caused by compressor lubricating oil; in addition, there are solid particles remaining in the system and generated during operation. The function of the compressor oil removal system is to remove oil, water and solid particles in the compressed helium gas. It is a key part of the helium refrigerator system. Its operating status directly affects the liquefaction stage of helium gas. Various equipment including turbo expanders Incomplete working efficiency, incomplete degreasing and purification treatment will directly increase the energy consumption of the helium refrigerator or cause the refrigerator to malfunction. The oil removal system of the screw compressor unit in the general large-scale helium refrigeration system includes the following process: (1) Mechanical separation method and condensation separation method for graded oil removal; (2) Activated carbon adsorption oil removal method; (3) Molecular sieve etc. for water discharge Drying; (4) Filter the solid dust. The oil and gas separator filter element, activated carbon and molecular sieve in the oil removal system are all consumables with a fixed lifespan. When a certain life cycle is reached, if they are not replaced in time, the performance of the entire oil removal system will be affected. At present, most degreasing systems in the prior art are not equipped with corresponding timers. Generally, the running time of the degreasing system is estimated according to the running time of the press, and then the relevant equipment is replaced. There is a problem in this way. The running time of the compressor is not completely equal to the time of the degreasing system. In addition, when the compressor is running, it is not completely running at full load, resulting in inaccurate timing, which will lead to premature or delayed replacement of related degreasing systems. Oil purification equipment, causing unnecessary losses.

Contents of the invention

The main purpose of the present invention is to provide a timing method and timer for the working time of the oil removal system of the screw compressor unit of a large helium refrigerator, which can display the mass flow rate, working time and record the total working time in real time and have the function of intelligent alarm.

The technical solution adopted by the present invention to solve its technical problems is:

The timing method for the working time of the oil removal system of the screw compressor unit of the large-scale helium refrigerator. When the helium refrigerator system is running, the flow meter is used to measure the flow rate. The single-chip computer collects the flow signal through the AD sampling function, and the flow signal is calculated and processed in the single-chip computer. Record the effective time, and also carry out alarm control through the alarm circuit; specifically, the following steps are included:

(1) Collect the current flow value, read the time value in the EPPROM of the single-chip microcomputer, and start timing with this time as the starting point;

(2) When the current flow value is less than the maximum flow value, the effective time is calculated according to the ratio of the current flow to the maximum flow, and then time statistics are performed according to the effective time;

(3) If the flow value is equal to the maximum flow value, directly perform time statistics;

(4) Determine whether the time value is greater than the alarm value, if it is greater than the alarm value, send an alarm signal, stop the machine and replace the corresponding equipment.

The timer for the working time of the oil removal system of a large helium refrigerator is characterized in that it includes a flowmeter installed on the pipeline, an acquisition circuit for collecting the output signal of the flowmeter, a single-chip microcomputer, a display circuit, and an alarm circuit. The input terminal of the acquisition circuit is connected to the output terminal of the flowmeter, the output terminal of the acquisition circuit is connected to the digital/analog port of the single-chip microcomputer, the display circuit and the alarm circuit are connected to the single-chip microcomputer respectively, and the output terminal of the alarm circuit is connected to the user terminal .

The timer for the working time of the oil removal system of the large-scale helium refrigerator is characterized in that the display circuit is a display drive circuit connected to the display output port of the single-chip microcomputer.

The timer for the working time of the degreasing system of the large-scale helium refrigerator is characterized in that: the alarm circuit is connected to the output of the single-chip microcomputer, and alarm parameters can be set at the same time, and the output end of the alarm circuit is connected to the user terminal. The user terminal can be the upper computer system of process monitoring, and the operator can learn about the alarm situation through the operator station of the process monitoring system.

The positive effect of the present invention is:

When the refrigerator system is working, the present invention calculates the working time of the degreasing system according to the flow rate flowing through the degreasing system, records the working time of the degreasing system according to the flow rate flowing through the system, and can simultaneously pass the alarm circuit , according to the effective life of each component, set the alarm signal and send it to the upper computer system in time.

Description of drawings

Fig. 1 is a flow chart of the method of the present invention.

Fig. 2 is a block diagram of the working time timer system of the degreasing system of the screw compressor unit of the large refrigerator helium refrigerator of the present invention.

Fig. 3 is the flow chart of the software work in the single-chip microcomputer of the present invention.

Detailed ways

As shown in Figure 2, a timer for the working time of the oil removal system of the screw compressor unit of a large helium refrigerator, including a flowmeter 1 arranged on the pipeline, and an acquisition circuit 2 for collecting the signal of the flowmeter 1 And the single-chip microcomputer 3, the display circuit 4 and the alarm circuit 5, the alarm parameters are set through the alarm circuit 5, and the alarm output is controlled. The input terminal of the acquisition circuit 2 is connected to the output terminal of the flowmeter 1, and the output terminal of the acquisition circuit 2 is connected to the number/mode port of the single-chip microcomputer 3, and the display circuit 4 and the alarm circuit 5 are connected with the single-chip microcomputer 3 respectively, and the alarm circuit The output terminal of 5 is connected to the user terminal 6; the display circuit 4 is the driving circuit of the display 7 connected with the display output port of the single-chip microcomputer 3. The single-chip microcomputer 3 can perform data processing, and can perform timing optimization according to the flow value, thereby more effectively counting time. The alarm circuit 5 can set the alarm time threshold according to different devices, and send the alarm information to the user terminal 6, and the user terminal 6 can be a host computer system of the process monitoring system. The operator can understand the alarm situation through the upper computer system, and take corresponding pre-plan measures in time to avoid equipment failure.

As shown in Figure 1, a method for timing the working time of the oil removal system of the screw compressor unit of a large-scale helium refrigerator. When the refrigerator system is running, the flow meter is used to measure the flow rate, and the AD sampling function of the single-chip microcomputer is used to collect the flow signal. The flow signal is processed to record the effective working time. Collect the current flow signal and display the flow value, read the time value in the ERPROM of the single-chip microcomputer and start timing from this. According to the maximum flow value, the effective time is calculated, and the final cumulative timing can visually display and store the total working time of the degreasing system. At the same time, according to the set value, an intelligent alarm can be issued to prompt the replacement of corresponding components. Specifically include the following steps:

(1) Collect the current flow value, read the time value in the EPPROM of the single-chip microcomputer, and start timing with this time as the starting point;

(2) When the current flow value is less than the maximum flow value, the effective time is calculated according to the ratio of the current flow to the maximum flow, and then time statistics are performed according to the effective time;

(3) If the flow value is equal to the maximum flow value, directly perform time statistics;

(4) Determine whether the time value is greater than the alarm value, if it is greater than the alarm value, send an alarm signal, stop the machine and replace the corresponding equipment.

As shown in Figure 3, when the helium refrigerator starts to run, the single-chip microcomputer initializes, reads the EPPROM time, starts timing, collects the output data of the current flowmeter, performs A/D conversion in the single-chip microcomputer, and records effective according to the flow rate Time, and display the flow value and time on the display, and count the time into the memory; at the same time output to the alarm circuit, and send an alarm signal to the user terminal according to the alarm setting value. The user makes corresponding processing according to the alarm signal.

Claims (4)

1. the clocking method of large-scale helium refrigerator SCREW COMPRESSOR oil removing system operating time, in the time that helium refrigerator system is moved, utilize flowmeter survey flow, single-chip microcomputer gathers flux signal by AD sampling functions, in single-chip microcomputer, flux signal is carried out to computing, to carrying out record working lipe, can also carry out controlling alarm by warning circuit simultaneously; Specifically comprise the following steps:

(1) gather current flow value, read the time value in single-chip microcomputer EPPROM, and start timing take this time as starting point;

(2) when present flow rate value is less than peak flow values, according to the ratio calculation working lipe of present flow rate and peak rate of flow, then according to carrying out time statistics working lipe;

(3), if when flow value equals peak flow values, directly carry out time statistics;

(4) judge whether time value is greater than alarming value, if be greater than alarming value, sends alarm signal, shut down the corresponding equipment of changing.

2. the timer of large-scale helium refrigerator oil removing system operating time, it is characterized in that: comprise the flowmeter being contained on pipeline, the Acquisition Circuit that the output signal of described flowmeter is gathered and single-chip microcomputer and display circuit, warning circuit, the output terminal of the flowmeter described in the input termination of described Acquisition Circuit, the D/A mouth of the single-chip microcomputer described in the output termination of Acquisition Circuit, display circuit and warning circuit connect with single-chip microcomputer respectively, the output termination user terminal of warning circuit.

3. the timer of large-scale helium refrigerator oil removing system operating time according to claim 2, is characterized in that: described display circuit is the drive circuit of the display device that connects with described single-chip microcomputer display prot.

4. the timer of large-scale helium refrigerator oil removing system operating time according to claim 2, it is characterized in that: described warning circuit connects the output of single-chip microcomputer, can carry out the setting of alarm parameters simultaneously, the output terminal of warning circuit connects user terminal, described user terminal can be the master system of process monitoring, and operator can recognize alarm condition by the operator station of PMS.

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