Control loop of heat supply network steam extraction adjusting valve control device

Abstract

The utility model belongs to the technical field of heat supply network steam extraction regulating valves, and particularly relates to a control loop of a heat supply network steam extraction regulating valve control device, which comprises a control system, an amplifier, a signal converter, a relay and a 24V air switch, the control system is electrically connected with the amplifier, the amplifier is electrically connected with the signal converter, and the relay is electrically connected with the 24V air switch. The signal converter is electrically connected with the control system, the amplifier is electrically connected with the relay, the relay is electrically connected with the 24V air switch, the 24V air switch is electrically connected with the amplifier, and the 24V air switch is electrically connected to the control system. The control system is connected with an amplifier, a signal converter, a relay and other elements to form a feedback control system. The feedback mechanism can feed back a part of the output signal to the input end and compare the part with the input signal, so that the gain and the performance of the amplifier are adjusted, and the stability and the response speed of the system are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of heat supply network steam extraction regulating valve, and specifically relates to a control loop of a heat supply network steam extraction regulating valve control device. BACKGROUND

[0002] The existing steam extraction regulating valve of the unit cannot reliably and stably meet the heat supply demand, faults occur frequently, and the heat supply effect of the two places is seriously affected. The main performance is that faults occur frequently and there is a large deviation between the regulating valve command signal and the actual feedback signal. This deviation causes the valve opening to frequently swing, and further causes the heat supply steam flow and pressure to fluctuate, thereby reducing the heat supply quality. In severe cases, it may even cause the heat supply to be interrupted, affecting the heat supply efficiency of the unit. Due to the large deviation between the command signal and the actual feedback signal of the regulating valve, the frequent swing of the valve opening not only affects the stability of the heat supply system, but also may cause the heat supply steam flow and pressure to fluctuate sharply, thereby reducing the heat supply quality. In some cases, this fluctuation may even cause the heat supply to be interrupted, seriously affecting the reliability of residential heating and industrial production heat supply. SUMMARY

[0003] In view of the technical problem that the existing steam extraction regulating valve of the unit cannot reliably and stably meet the heat supply demand, the utility model provides a control loop of a heat supply network steam extraction regulating valve control device, which significantly improves the performance and reliability of the system through feedback control, signal conversion, automatic control, accurate feedback, fault detection and indication monitoring and other aspects of optimization.

[0004] In order to solve the above technical problem, the utility model adopts the technical scheme that:

[0005] A control loop of a heat supply network steam extraction regulating valve control device, comprising a control system, an amplifier, a signal converter, a relay and a 24V air switch, the control system is electrically connected with the amplifier, the amplifier is electrically connected with the signal converter, the signal converter is electrically connected with the control system, the amplifier is electrically connected with the relay, the relay is electrically connected with the 24V air switch, the 24V air switch is electrically connected with the amplifier, and the 24V air switch is electrically connected on the control system.

[0006] It also includes a 24V power supply, an indicator light and a valve position feedback device, the 24V power supply is electrically connected with the 24V air switch and the control system respectively, the indicator light is electrically connected between the 24V power supply and the 24V air switch, and the valve position feedback device is electrically connected on the control system.

[0007] The valve position feedback device is electrically connected with a first potentiometer, a second potentiometer and a third potentiometer respectively.

[0008] The input end of the amplifier is electrically connected with the output end of the control system and the signal converter and the relay respectively, and the output end of the amplifier is electrically connected with the input end of the signal converter, the control system and the 24V air switch respectively.

[0009] The control system comprises a deviation detection module, a bad point detection module and a delay output module, the deviation detection module and the bad point detection module are connected with the valve position feedback device, the deviation detection module is connected with the delay output module, the delay output module is connected with the 24V air switch, the bad point detection module is connected with the 24V air switch, and the deviation detection module is connected with the signal converter.

[0010] Compared with the prior art, the utility model has beneficial effects that are:

[0011] 1、The control system of the utility model is connected with the amplifier, the signal converter, the relay and other components to form a feedback control system.

[0012] 2、The input end of the amplifier receives signals from the control system, the signal converter and the relay, and the output end transmits signals to the signal converter, the control system and the 24V air switch.

[0013] 3、In the utility model, the system can realize automatic control through the connection of the 24V air switch and the relay. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description.

[0015] The structures, proportions, sizes, etc. shown in the specification are merely used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the implementation conditions of the utility model, so they do not have substantial technical significance. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0016] Figure 1 A circuit diagram of the utility model;

[0017] Figure 2 A structure block diagram of the control system of the utility model.

[0018] Among them: U is a control system, G is an amplifier, DAC is a signal converter, KM is a relay, QF is a 24V air switch, DC is a 24V power supply, HL is an indicator light, V is a valve position feedback device, E is a deviation detection module, D is a bad point detection module, T is a delay output module, A is a first potentiometer, B is a second potentiometer, and C is a third potentiometer. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the application, not all the embodiments. These descriptions are only for further illustrating the features and advantages of the utility model, and are not a limitation on the claims of the utility model. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the application.

[0020] The specific embodiments of the utility model will be further described in detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0021] The terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the application, unless otherwise specified, the meaning of "multiple" is two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] This embodiment provides a control circuit for a heating network steam extraction regulating valve control device, such as... Figure 1 As shown, the system includes a control system U, an amplifier G, a signal converter DAC, a relay KM, a 24V air switch QF, a 24V power supply DC, an indicator light HL, and a valve position feedback device V. The control system U transmits control signals to the amplifier G through its output. The amplifier G receives signals not only from the control system U but also from the output signal of the signal converter DAC and the signal from the relay KM. The amplifier G amplifies these signals and outputs the amplified signals to the signal converter DAC, the control system U, and the 24V air switch QF. The signal converter DAC converts the digital signal into an analog signal and then transmits it to the amplifier G and other devices. Simultaneously, the valve position feedback device V feeds back the actual valve position to the control system U for comparison and adjustment of the control signal. The output signal of the amplifier G is also connected to the relay KM, which further controls the on / off state of the 24V air switch QF. When the 24V air switch QF is closed, it provides power to the entire system and displays the status via the indicator light HL. The 24V power supply DC provides a stable DC power supply to the entire system and is connected to both the 24V air switch QF and the control system U. The indicator light HL is located between the 24V DC power supply and the 24V air switch QF, and is used to display the power status of the system.

[0024] Furthermore, such as Figure 2 As shown, the control system U includes a deviation detection module E, a fault detection module D, and a delay output module T. Deviation detection module E and fault detection module D are connected to the valve position feedback unit V to detect deviations and faults in the system. Deviation detection module E is also connected to the delay output module T. When a deviation between the command and feedback is detected to be greater than 10, or a fault occurs, the delay output module T will trigger the 24V air switch QF to disconnect after a 10-second delay to protect the system. The entire system forms a closed-loop control circuit through the valve position feedback unit V, deviation detection module E, and fault detection module D. The control system U adjusts the output signal according to the feedback signal to ensure precise control of the valve position.

[0025] Only the preferred embodiments of the utility model are described in detail above, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of the ordinary skill in the art without departing from the purpose of the utility model, and various changes should be included in the protection range of the utility model.

Claims

1. A control loop of a heat supply network extraction valve control device, characterized in that: The control system (U) is electrically connected with the amplifier (G), the amplifier (G) is electrically connected with the signal converter (DAC), the signal converter (DAC) is electrically connected with the control system (U), the amplifier (G) is electrically connected with the relay (KM), the relay (KM) is electrically connected with the 24V air switch (QF), the 24V air switch (QF) is electrically connected with the amplifier (G), and the 24V air switch (QF) is electrically connected on the control system (U).

2. The control loop of a heat supply network extraction valve control device according to claim 1, characterized in that The 24V power supply (DC) is electrically connected with the 24V air switch (QF) and the control system (U) respectively, the indicating lamp (HL) is electrically connected between the 24V power supply (DC) and the 24V air switch (QF), and the valve position feedback device (V) is electrically connected on the control system (U).

3. The control loop of a heat supply network extraction valve control device according to claim 2, characterized in that: The valve position feedback device (V) is electrically connected with the first potentiometer (A), the second potentiometer (B) and the third potentiometer (C) respectively.

4. The control loop of the heat supply network extraction valve control device according to claim 1, characterized in that: The input end of the amplifier (G) is electrically connected with the control system (U), the output end of the signal converter (DAC) and the relay (KM) respectively, and the output end of the amplifier (G) is electrically connected with the input end of the signal converter (DAC), the control system (U) and the 24V air switch (QF) respectively.

5. The control loop of a heat supply network extraction valve control device according to claim 2, characterized in that: The control system (U) comprises a deviation detection module (E), a bad point detection module (D) and a time delay output module (T), the deviation detection module (E) and the bad point detection module (D) are connected with the valve position feedback device (V), the deviation detection module (E) is connected with the time delay output module (T), the time delay output module (T) is connected with the 24V air switch (QF), the bad point detection module (D) is connected with the 24V air switch (QF), and the deviation detection module (E) is connected with the signal converter (DAC).

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