CN203165340U - Flow control experimental device with lagging - Google Patents

Abstract

The utility model discloses a flow control experimental device with lagging, relating to a flow control teaching instrument. The device comprises a power supply module, a DC power supply module, a flow detection and transmission module, an operation panel module, a controller module, a power and actuator module, a host computer module and a control object module. The operation panel module, the power and actuator module and the host computer module are respectively connected with the controller module. The DC power supply module, the operation panel module and the control object module are respectively connected with the flow detection and transmission module. The DC power supply module and the actuator module are respectively connected with the power supply module. The actuator module is connected with the control object module. The device has the advantages that a flow control object with lagging can be provided, the diversity of an automation instrument experiment device is realized, an experimental and innovative platform is provided for students, and a comprehensive experimental platform is provided for the instrument automation related training, skill assessment and scientific research project research and development of colleges, scientific research and training institutions at the same time.

Description

A kind of flow control experimental provision with hysteresis

Technical field

The utility model relates to a kind of flow control experiment teaching instrument, specifically is a kind of flow control experimental provision with hysteresis, is particularly useful for the relevant teaching of instrument automation of universities.

Background technology

Flow is one of the most frequently used variable of process control technology, therefore, flow control is played very big effect to the cultivation of instrument automation associative skills, at present, the training of instrument automation associative skills, study is in the laboratory equipment needed thereby to be connected together to constitute different detection and control loop with research, generally speaking, be the control object of flow for controlled variable, retardation time is very little, and is less to the control performance influence, yet, at the actual industrial scene, because the restriction of technology and mounting condition is difficult to reduce or shorten the influence of pipeline and resistance, causes retardation time bigger than common retardation time.The flow control process situation that band lags behind is after laboratory or the simulation of real training chamber realize, experimental facilities just can reach cultivation not only to have been possessed sturdy technical know-how, but also possessed manipulative ability, the innovation comprehensive application ability talent's requirement.

Summary of the invention

In order to overcome the shortcoming of above-mentioned prior art, the utility model provides a kind of flow control experimental provision with hysteresis, and simple in structure, safe and reliable, result of use is good.

The utility model is realized with following technical scheme: a kind of flow control experimental provision with hysteresis comprises power module, DC power supplier, flow detection transmitting module, guidance panel module, controller module, power and executor module, upper computer module and control object module; Guidance panel module, power and executor module are connected with controller module respectively with upper computer module, DC power supplier, guidance panel module and control object module are connected with the flow detection transmitting module respectively, DC power supplier is connected with power module respectively with executor module, and executor module is connected with the control object module.

The beneficial effects of the utility model are: the object of the flow control with hysteresis characteristic can be provided, enriched the diversity of instrument and meter for automation experimental provision and comprehensive, not only for the student provides experiment, innovation, competition platform, also research and develop for the relevant training of instrument automation, technical ability examination and the scientific research project of colleges and universities, scientific research and training organization simultaneously more comprehensive experiment porch is provided.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing and specific implementation method.

Fig. 1 is the utility model system chart;

Fig. 2 is a kind of embodiment process chart of the utility model;

Fig. 3 is the high water tank upcurve figure in the present embodiment;

Fig. 4 is the water tank rate of discharge upcurve figure in the present embodiment.

Embodiment

As shown in Figure 1, a kind of flow control experimental provision with hysteresis comprises power module 1, DC power supplier 2, flow detection transmitting module 3, guidance panel module 4, controller module 5, power and executor module 6, upper computer module 7 and control object module 8; Guidance panel module 4, power and executor module 6 are connected with controller module 5 respectively with upper computer module 7, DC power supplier 2, guidance panel module 4 and control object module 8 are connected with flow detection transmitting module 3 respectively, DC power supplier 2 is connected with power module 1 respectively with executor module 6, and executor module 6 is connected with control object module 8.

As shown in Figure 2, control object module 8 comprises a water tank 81, tank 82 and hand valve 83, and the bottom of water tank 81 is connected by the top of outlet conduit with tank 82, and the top of water tank 81 is connected by the bottom of inlet channel with tank 82.Flow detection transmitting module 3 comprises two electronic flow-meters of 1#, 2#, and wherein the 1# electronic flow-meter is installed in the flow that is used for measuring water tank 81 entry on the inlet channel, and the 2# electronic flow-meter is installed in the flow that is used for measuring water tank 81 water outlets on the outlet conduit.Power and executor module 6 comprise a canned motor pump 61 and an electric control valve 62, canned motor pump 61 and electric control valve 62 are installed on the inlet channel, the input end of canned motor pump reaches tank 82 bottoms by pipeline, the shielding delivery side of pump by pipeline, electric control valve 62, reach the top of water tank 81, one hand valve 83 respectively is installed on canned motor pump 61 pipelines on two sides, one hand valve 83 is installed on the outlet conduit, can be controlled water is put back to tank 82.

Canned motor pump adopts the form of constant current amount up to send water from tank, opens at three hand valves 83, under the situation that electric control valve is opened, if Q1 is the flow that flows into water tank 81, Q2 is the flow that flows out water tank 81, and h is the liquid level of water tank 81, and A is the cross-sectional area of water tank 81.The value of Q1 is recorded by the 1# electronic flow-meter, and the value of Q2 is recorded by the 2# electronic flow-meter.This moment, Q1 remained unchanged, and supposed that initial liquid level h is 0, and along with the increase h value of time slowly increases, the value of Q2 is along with the also slowly increase of increase of h value, and when the value of Q2 equaled the value of Q1, system reached balance, and the h value no longer changes.Obviously the value of Q2 will reach the value of Q1, has the regular hour to lag behind big Theravada's direct ratio of the size of retardation time and A.The upcurve of liquid level h as shown in Figure 3, the upcurve of Q2 is as shown in Figure 4.After the value of Q1 had a step to change, the value of Q2 still needed such process of adjusting that lags behind just can reach new equilibrium state.

In flow rate set value when experiment control of not having hysteresis, only need open three hand valves 83, the Q1 value that controller module 5 records according to the 1# electronic flow-meter and set-point relatively, the aperture of selecting increase or reducing electric control valve is gone adjusting.When the flow rate set value control experiment of hysteresis need be arranged, to open three hand valves 83 equally, this moment, controller module 5 compared according to Q2 value and the set-point that the 2# electronic flow-meter records, the aperture that select to increase or reduce electric control valve goes to regulate, like this flow control platform for verifying that complicated control algolithm effect provides band preferably to lag behind.

Claims (2)

1. the flow control experimental provision with hysteresis is characterized in that: comprise power module (1), DC power supplier (2), flow detection transmitting module (3), guidance panel module (4), controller module (5), power and executor module (6), upper computer module (7) and control object module (8); Guidance panel module (4), power and executor module (6) are connected with controller module (5) respectively with upper computer module (7), DC power supplier (2), guidance panel module (4) and control object module (8) are connected with flow detection transmitting module (3) respectively, DC power supplier (2) is connected with power module (1) respectively with executor module (6), and executor module (6) is connected with control object module (8).

2. a kind of flow control experimental provision with hysteresis according to claim 1, it is characterized in that: described control object module (8) comprises a water tank (81), a tank (82) and hand valve (83), the bottom of water tank (81) is connected by the top of outlet conduit with tank (82), and the top of water tank (81) is connected by the bottom of inlet channel with tank (82); Flow detection transmitting module (3) comprises two electronic flow-meters of 1#, 2#, wherein the 1# electronic flow-meter is installed in the flow that is used for measuring water tank (81) entry on the inlet channel, and the 2# electronic flow-meter is installed in the flow that is used for measuring water tank (81) water outlet on the outlet conduit; Power and executor module (6) comprise a canned motor pump (61) and an electric control valve (62), canned motor pump (61) and electric control valve (62) are installed on the inlet channel, the input end of canned motor pump reaches tank (82) bottom by pipeline, the shielding delivery side of pump by pipeline, electric control valve (62), reach the top of water tank (81), on canned motor pump (61) pipelines on two sides hand valve (83) is installed respectively, a hand valve (83) is installed on the outlet conduit.

Images