阅读说明：本技术 一种试车台供油系统流量在线校准系统及校准方法 (Online calibration system and calibration method for flow of oil supply system of test bed ) 是由 葛纪全 张作慧 于航 刘盼盼 段小俊 于 2021-09-07 设计创作，主要内容包括：本发明涉及一种试车台供油系统流量在线校准系统及校准方法,包括标准流量计、三通一、三通二、手阀一、手阀二、手阀三,所述被检流量计所设置的输油管路的出油方向的一端依次串联有三通一、手阀一和三通二,所述三通一的第三个端口连接有手阀二,三通二的第三个端口连接有手阀三,所述手阀二和手阀三的通过管路相连,标准流量计设置在手阀二和手阀三连接的管路上。本发明解决了发动机试车台供油系统流量计校准过程中反复拆卸,影响试车系统稳定性和利用率的问题。(The invention relates to an on-line flow calibration system and a calibration method for an oil supply system of a test bed, which comprises a standard flowmeter, a first tee joint, a second tee joint, a first hand valve, a second hand valve and a third hand valve, wherein one end of an oil outlet direction of an oil pipeline arranged on a tested flowmeter is sequentially connected with the first tee joint, the first hand valve and the second tee joint in series, a third port of the first tee joint is connected with the second hand valve, a third port of the second tee joint is connected with the third hand valve, the second hand valve is connected with the third hand valve through a pipeline, and the standard flowmeter is arranged on the pipeline connected with the second hand valve and the third hand valve. The invention solves the problem that the stability and the utilization rate of a test run system are influenced by repeated disassembly in the process of calibrating the flowmeter of the oil supply system of the engine test run table.)

1. The utility model provides a test bench oil feeding system flow online calibration system, includes defeated oil pipe way, is examined flowmeter and hand valve four, and hand valve four sets up on defeated oil pipe way, is located oil inlet and is examined between the flowmeter, its characterized in that: still include standard flowmeter, tee bend one, tee bend two, hand valve one, hand valve two, hand valve three, the one end of the defeated oil pipe way that the inspection flowmeter set up of producing oil direction is established ties in proper order and is had tee bend one, hand valve one and tee bend two, the third port of tee bend one is connected with hand valve two, and the third port of tee bend two is connected with hand valve three, hand valve two and hand valve three link to each other through the pipeline, and standard flowmeter sets up on the pipeline that hand valve two and hand valve three are connected.

2. The system for calibrating the flow of the oil supply system of the test bed in the on-line mode according to claim 1, wherein: the standard flowmeter adopts a 0.1-grade mass flowmeter.

3. The on-line calibration method for the on-line calibration system of the flow of the test bed oil supply system of any one of claims 1 to 2 is characterized by comprising the following steps:

the method comprises the following steps: when the oil supply system of the test bed is calibrated, closing the hand valve I, opening the hand valve II and opening the hand valve III so that the detected flowmeter and the standard flowmeter are in a serial state;

step two: recording the flow value of the detected flowmeter as Q1, the flow value of the standard flowmeter as Q2, and calculating the indicating value error delta Q of the flowmeter as Q2-Q1 by adopting a comparison method, thereby obtaining a system error and finishing the calibration of the flowmeter;

step three: after the flowmeter is calibrated, the first hand valve, the second hand valve and the third hand valve are opened, and the oil supply system of the test bed works normally.

Technical Field

The invention belongs to the technical field of flow detection, and particularly relates to an online calibration system and an online calibration method for the flow of an oil supply system of a test bed.

Background

The test bed oil supply system mainly comprises a flowmeter, an oil pipeline, an oil pump, a hand valve and a filtering system, the flowmeter needs to be regularly calibrated to ensure the accuracy of flow parameter testing, but the flowmeter has large mass and volume, limited field space and high accuracy of calibrated parameters, the existing means cannot meet the field calibration requirement of the flowmeter for the test bed, and the flowmeter is periodically disassembled at present and then is sent to an appointed place to trace to the source. When the mass flowmeter is disassembled, fuel oil in an oil supply system of the test bed needs to be emptied and injected again after the mass flowmeter is assembled, air can be mixed into the oil supply system in the disassembling process, the condition that the system is unstable for a period of time is caused, and the utilization rate of the test bed is influenced; meanwhile, the mass flow meter is huge in size, and a large amount of manpower and material resources are consumed for inspection, so that the bottleneck problem of the trial run production link is limited.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an online calibration system and a calibration method for the flow of an oil supply system of a test bed, and solves the problem that the stability and the utilization rate of the test system are influenced by repeated disassembly in the calibration process of a flowmeter of the oil supply system of the engine test bed.

The utility model provides a test bench oil feeding system flow online calibration system, includes defeated oil pipe way, is examined flowmeter and hand valve four, and hand valve four sets up on defeated oil pipe way, is located the oil entry and is examined between the flowmeter, still includes standard flowmeter, tee bend one, tee bend two, hand valve one, hand valve two, hand valve three, the one end of the defeated oil pipe way that the flowmeter set up of examining establishes ties in proper order has tee bend one, hand valve one and tee bend two, the third port of tee bend one is connected with hand valve two, and the third port of tee bend two is connected with hand valve three, hand valve two and hand valve three link to each other through the pipeline, and standard flowmeter sets up on the pipeline of hand valve two and hand valve three connections.

The standard flowmeter adopts a 0.1-grade mass flowmeter.

The online calibration method of the online calibration system for the flow of the oil supply system of the test bed specifically comprises the following steps:

the method comprises the following steps: when the oil supply system of the test bed is calibrated, closing the hand valve I, opening the hand valve II and opening the hand valve III so that the detected flowmeter and the standard flowmeter are in a serial state;

step two: recording the flow value of the detected flowmeter as Q1, the flow value of the standard flowmeter as Q2, and calculating the indicating value error delta Q of the flowmeter as Q2-Q1 by adopting a comparison method, thereby obtaining a system error and finishing the calibration of the flowmeter;

step three: after the flowmeter is calibrated, the first hand valve, the second hand valve and the third hand valve are opened, and the oil supply system of the test bed works normally.

The invention has the beneficial effects that: the invention realizes the on-site calibration of the engine oil supply system, can save the turnaround time of outsourcing inspection of the disassembled flowmeter, and avoids the problems that the stability and the utilization rate of a test run system are influenced by repeated disassembly in the calibration process of the flowmeter of the engine test run platform oil supply system and the statistic performance of the engine oil supply system is influenced.

Drawings

FIG. 1 is a schematic view of an oil supply system according to the present invention (wherein FIG. (a) is a front view, and FIG. (b) is a plan view)

FIG. 2 is a schematic view of the calibration principle of the oil supply system of the present invention;

FIG. 3 is a schematic view of an oil supply system of a current engine test bed;

FIG. 4 is a detailed calibration schematic of the oil supply system provided by the present invention;

wherein the content of the first and second substances,

1-detected flowmeter, 2-standard flowmeter, 3-three-way one, 4-three-way two, 5-hand valve one, 6-hand valve two, 7-hand valve three, 8-hand valve four.

Detailed Description

For better understanding of the present invention, the technical solutions and effects of the present invention will be described in detail by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1, the online flow calibration system for the oil supply system of the test bed comprises an oil conveying pipeline, a detected flowmeter 1 and a hand valve four 8, wherein the hand valve four 8 is arranged on the oil conveying pipeline and is positioned between an oil inlet and the detected flowmeter 1, the online flow calibration system further comprises a standard flowmeter 2, a tee joint I3, a tee joint II 4, a hand valve I5, a hand valve II 6 and a hand valve III 7, the three ends of the pipeline, arranged on the detected flowmeter 1, in the oil outlet direction are sequentially connected in series with the tee joint I3, the hand valve I5 and the tee joint II 4, the third port of the tee joint I3 is connected with the hand valve II 6, the third port of the tee joint II 4 is connected with the hand valve III 7, the hand valve II 6 is connected with the hand valve III 7 through a pipeline, and the standard flowmeter 2 is arranged on the pipeline, connected with the hand valve II 6 and the hand valve III 7, so that the standard flowmeter 2 is connected in parallel with the hand valve I5. When the first hand valve 5 is closed, the second hand valve 6 and the third hand valve 7 are opened, the detected flowmeter 1 and the standard flowmeter 2 are in a serial state; when the first hand valve 5 is opened, the second hand valve 6 and the third hand valve 7 are closed, the oil in the pipeline does not flow through the second hand valve 6, the standard flowmeter 2 and the third hand valve 7.

According to the structural characteristics and technical requirements of a test bed oil supply system, the online calibration mainly has the following difficulties:

(1) the mass flowmeter used by the oil supply system has high accuracy, and the measurement uncertainty of the calibration device is not less than 1 percent, so that the requirement of sufficient transmission can be met;

(2) the pipeline installation of the oil supply system is compact, the peripheral space is narrow, and the requirements on the size and the installation flexibility of the calibration device are high;

(3) the test bed oil supply system pipeline does not have a calibration interface at present, and can be connected with the calibration device after the pipeline needs to be transformed.

Therefore, according to the characteristics of the oil supply system of the engine test bed, the flow parameter of the oil supply system is calibrated by adopting a standard flowmeter 2 comparison mode, and the calibration principle is shown in figure 2.

When carrying out flow measurement system's online calibration, need be connected to standard flowmeter 2 and supply oil pipe way in, as shown in fig. 3, the access demand of calibrating device can't be satisfied to current condition, needs to reform transform the pipeline of test bed oil supply system. Therefore, the actual condition of the pipeline is combined, the limited space is utilized, and meanwhile, the stability of the oil supply system needs to be ensured, and convenient installation conditions need to be provided for the calibration device. According to the invention, the standard flowmeter 2 is connected in series in the calibrated oil supply system through the arrangement of the three-way valve I3, the three-way valve II 4, the hand valve II 6 and the hand valve III 7, the standard flowmeter 2 and the hand valve I5 are connected in parallel and are positioned close to the outlet, and the work of the standard flowmeter 2 is realized only by opening and closing the corresponding hand valves.

At present, the highest traceable accuracy grade of the domestic flowmeter is 0.1 grade, and meanwhile, the standard flowmeter 2 adopts a 0.1 grade mass flowmeter to carry out calibration test in consideration of the pipeline condition and the requirements of various flowmeters on straight pipe sections.

The method for online calibrating the flow of the test bed oil supply system by adopting the online calibration system specifically comprises the following steps:

the method comprises the following steps: when the oil supply system of the test bed is calibrated, closing the first hand valve 5, opening the second hand valve 6 and the third hand valve 7, so that the detected flowmeter 1 and the standard flowmeter 2 are in a serial state; the calibration principle is shown in fig. 4.

Step two: recording the flow value of the detected flowmeter 1 as Q1, the flow value of the standard flowmeter 2 as Q2, and calculating the indicating value error delta Q of the flowmeter as Q2-Q1 by adopting a comparison method, namely obtaining the system error, thereby completing the calibration of the flowmeter.

Step three: after the flowmeter is calibrated, the first hand valve 5 is opened, the second hand valve 6 and the third hand valve 7 are closed, and the oil supply system of the test bed works normally.