Wide-range high-precision metrology system control circuit

Abstract

The application belongs to the technical field of fluid metering control, and particularly relates to a wide-range high-precision metering system control circuit. The power supply end of the main pipeline flow metering controller and the power supply end of the secondary pipeline flow metering controller are respectively connected with two ends of a power supply unit; the low-position alarm switch of the main pipeline flow metering controller, the normally closed switch of the first relay and the terminal of the second relay are connected in series and then connected between the live wire and the zero line of the power supply unit; the high-position alarm of the secondary pipeline flow metering controller and the terminal of the first relay are connected in series and then connected between the live wire and the zero line of the power supply unit; the high-position alarm of the secondary pipeline flow metering controller is connected in parallel with a time relay control switch, and the terminal of the first relay is connected in parallel with a time relay. The wide-range high-precision metering system control circuit can control the corresponding control valve according to the change of the pipeline water level, so that the internal water level of the conveying pipeline is kept stable, and the influence of the liquid level fluctuation on the flow meter detection is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fluid metering control, and particularly relates to a wide-range high-precision metering system control circuit. BACKGROUND

[0002] The current flow metering device is widely used, and different metering devices with different ranges can be used for different flow rates. For small flow rate, a small-range device can be used to obtain more accurate results. For large flow rate, a large-range device can be used, and the results can be less accurate than those of the small-range device, but the range is larger. Therefore, when metering gas or liquid with large flow rate fluctuation, it is very troublesome to use a small-range metering device which can exceed the range or a large-range metering device which can obtain inaccurate results when the flow rate is small. Therefore, a wide-range high-precision metering system control circuit is provided. SUMMARY

[0003] To solve the defects and problems of the prior art, the purpose of the present application is to provide a wide-range high-precision metering system control circuit which is simple in structure, reasonable in design and convenient to use.

[0004] It can control the corresponding control valve according to the change of the water level of the pipeline to maintain the stable water level in the conveying pipeline, thereby reducing the influence of liquid level fluctuation on the detection of the flow meter.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows.

[0006] It comprises a main pipeline flow metering controller, a secondary pipeline flow metering controller, a power switch, a main pipeline flow metering controller low-position alarm switch, a secondary pipeline flow metering controller high-position alarm, a relay one, a relay two, a time relay, a time relay control switch and a relay one normally closed switch.

[0007] The live wire and the zero wire of the power supply unit are connected between the power supply ends of the main pipeline flow metering controller and the secondary pipeline flow metering controller, and the live wire and the zero wire of the power supply unit are connected with the power switch. The main pipeline flow metering controller low-position alarm switch, the relay one normally closed switch and the relay two electromagnetic coil terminal are connected in series and connected between the live wire and the zero wire of the power supply unit. The secondary pipeline flow metering controller high-position alarm and the relay one electromagnetic coil terminal are connected in series and connected between the live wire and the zero wire of the power supply unit. The time relay control switch is connected in parallel on the secondary pipeline flow metering controller high-position alarm, and the time relay is connected in parallel on the relay one electromagnetic coil terminal.

[0008] As a preferred, the two normally open terminals of the relay two are connected with the power supply ends of the main pipeline control valve respectively, and the corresponding two normally closed terminals are connected with the power supply ends of the secondary pipeline control valve respectively.

[0009] As a preference, the low-level alarm switch of the main pipeline flow metering controller is in a low-level alarm disconnect state.

[0010] As a preference, the high-level alarm of the secondary pipeline flow metering controller is in a high-level alarm connection state.

[0011] With the above structure, the present application has the following advantages:

[0012] It can control the corresponding control valve according to the change of the pipeline water level, so as to keep the internal water level of the conveying pipeline stable, thereby reducing the influence of liquid level fluctuation on the flow meter detection. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the present application is described in detail by the following specific embodiments and drawings.

[0014] Fig. 1 It is a structural schematic diagram of the present application;

[0015] Fig. 2 It is a schematic diagram of the connection of the relay one J1 terminal of the present application;

[0016] Fig. 3 It is a schematic diagram of the connection of the relay two J2 terminal of the present application;

[0017] Explanation of reference signs:

[0018] Main pipeline flow metering controller YB1, secondary pipeline flow metering controller YB2, power switch K, main pipeline flow metering controller low-level alarm switch YB1-L, secondary pipeline flow metering controller high-level alarm YB2-H, relay one J1, relay two J2, time relay SJ, time relay control switch SJ-1, relay one normally closed switch J1-1. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the present application is described below by specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0020] Here, it should be noted that, in order to avoid obscuring the present application due to unnecessary details, only the structures and / or processing steps closely related to the scheme according to the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0021] Referring to FIG. 1, Figs. 1-3The embodiment adopts the following technical scheme: it comprises a main pipeline flow metering controller YB1, a secondary pipeline flow metering controller YB2, a power switch K, a main pipeline flow metering controller low position alarm switch YB1-L, a secondary pipeline flow metering controller high position alarm YB2-H, a relay one J1, a relay two J2, a time relay SJ, a time relay control switch SJ-1, and a relay one normally closed switch J1-1; the power supply ends of the main pipeline flow metering controller YB1 and the secondary pipeline flow metering controller YB2 are connected between the live wire L and the zero wire N of a power supply unit, and the live wire L and the zero wire N of the power supply unit are connected with the power switch K; the main pipeline flow metering controller low position alarm switch YB1-L, the relay one normally closed switch J1-1, and the relay two J2 electromagnetic coil terminal are connected in series between the live wire L and the zero wire N of the power supply unit; the secondary pipeline flow metering controller high position alarm YB2-H and the relay one J1 electromagnetic coil terminal are connected in series and connected between the live wire L and the zero wire N of the power supply unit; the secondary pipeline flow metering controller high position alarm YB2-H is connected in parallel with the time relay control switch SJ-1, and the relay one J1 electromagnetic coil terminal is connected in parallel with the time relay SJ.

[0022] The two normally open terminals of the relay two J2 are connected with the power supply ends of the main pipeline control valve F1 respectively; and the corresponding two normally closed terminals are connected with the power supply ends of the secondary pipeline control valve F2 respectively.

[0023] In addition, the main pipeline flow metering controller low position alarm switch YB1-L is in a low position alarm open state; and the secondary pipeline flow metering controller high position alarm YB2-H is in a high position alarm connected state.

[0024] The working principle of the embodiment is as follows:

[0025] Firstly, the liquid submerges the main pipeline flow metering controller low position alarm switch YB1-L to make it connected;

[0026] The relay two J2 electromagnetic coil terminal is connected with electricity, the normally open contact switch of the relay two J2 is connected to make the main pipeline control valve F1 conduct electricity to control the flow; when the liquid in the pipeline increases to be diverted to the secondary pipeline, and the liquid level in the secondary pipeline increases to trigger the secondary pipeline flow metering controller high position alarm YB2-H to be connected, the relay one J1 electromagnetic coil terminal is made to conduct electricity to be attracted, the relay one normally closed switch J1-1 is disconnected, the relay two J2 electromagnetic coil terminal is disconnected, and the normally open terminal in the relay two J2 is switched to the normally closed terminal, so that the main pipeline control valve F1 is disconnected, and the secondary pipeline control valve F2 is opened to quickly meter and dredge;

[0027] At the same time, the secondary pipeline flow metering controller high alarm YB2-H triggers the time relay SJ, and the time relay SJ makes the time relay control switch SJ-1 close momentarily after the time relay SJ counts down, and shorts the secondary pipeline flow metering controller high alarm YB2-H; and makes the relay one J1 lose power, the relay one normally closed switch J1-1 close, and returns to the main pipeline flow metering.

[0028] The embodiment can control the corresponding control valve according to the effect of the change of the pipeline water level, keep the internal water level of the conveying pipeline stable, and reduce the influence of the liquid level fluctuation on the flow meter detection.

[0029] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A control circuit for a wide-range, high-precision metering system, characterized in that: The control circuit includes a main pipeline flow metering controller (YB1), a secondary pipeline flow metering controller (YB2), a power switch (K), a low-level alarm switch for the main pipeline flow metering controller (YB1-L), a high-level alarm switch for the secondary pipeline flow metering controller (YB2-H), a relay one (J1), a relay two (J2), a time relay (SJ), a time relay control switch (SJ-1), and a normally closed switch for relay one (J1-1). The power supply terminals of the main pipeline flow metering controller (YB1) and the secondary pipeline flow metering controller (YB2) are respectively connected between the live wire (L) and the neutral wire (N) of the power supply unit, and the live wire (L) and the neutral wire (N) of the power supply unit are connected to... A power switch (K) is connected; the main pipeline flow metering controller's low-level alarm switch (YB1-L), relay one normally closed switch (J1-1), and relay two (J2) electromagnetic coil terminals are connected in series between the live wire (L) and neutral wire (N) of the power supply unit; the secondary pipeline flow metering controller's high-level alarm switch (YB2-H) is connected in series with relay one (J1) electromagnetic coil terminals between the live wire (L) and neutral wire (N) of the power supply unit; a time relay control switch (SJ-1) is connected in parallel to the secondary pipeline flow metering controller's high-level alarm switch (YB2-H), and a time relay (SJ) is connected in parallel to the relay one (J1) electromagnetic coil terminals; The two normally open terminals on the relay (J2) are respectively connected to the power supply terminal of the main pipeline control valve (F1); and the corresponding two normally closed terminals are respectively connected to the power supply terminal of the secondary pipeline control valve (F2). The operation steps of the wide-range, high-precision metrology system are as follows: First, the liquid immerses the low-position alarm switch (YB1-L) of the main pipeline flow metering controller to connect it; the electromagnetic coil terminal of relay two (J2) is energized and activated, and the normally open contact switch of relay two (J2) is closed, so that the main pipeline control valve (F1) is conductive to control the flow. When the liquid inside the pipeline increases, it is diverted from the main pipeline to the secondary pipeline. When the liquid level inside the secondary pipeline increases, it triggers the high-level alarm switch (YB2-H) of the secondary pipeline flow metering controller to be turned on. This causes the electromagnetic coil terminal of relay one (J1) to conduct electricity and attract, causing the normally closed switch (J1-1) of relay one to open. The electromagnetic coil terminal of relay two (J2) is de-energized, and the normally open terminal inside relay two (J2) switches to the normally closed terminal, causing the main pipeline control valve (F1) to open and the secondary pipeline control valve (F2) to open for rapid metering and diversion. At the same time, when the high-level alarm switch (YB2-H) of the secondary pipeline flow metering controller is triggered, the time relay (SJ) is activated synchronously. After the countdown of the time relay (SJ) ends, the time relay control switch (SJ-1) is closed momentarily, short-circuiting the high-level alarm switch (YB2-H) of the secondary pipeline flow metering controller; causing relay one (J1) to be de-energized and the normally closed switch (J1-1) of relay one to close, returning to the main pipeline flow metering control.

2. The control circuit of the wide-range, high-precision metering system according to claim 1, characterized in that: The low-level alarm switch (YB1-L) of the main pipeline flow metering controller is in the low-level alarm off state.

3. The control circuit of the wide-range, high-precision metering system according to claim 1, characterized in that: The high-level alarm switch (YB2-H) of the secondary pipeline flow metering controller is in the high-level alarm connected state.

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