Pressure sensing control circuit of PCV valve controller

Abstract

The utility model discloses a PCV valve controller pressure sensing control circuit, which relates to the technical field of monitoring analysis and comprises a multi-end pressure transmitter, a value taking circuit, a processor CPU, a voltage stabilizing circuit, a power supply wiring terminal, a circuit output end and a controller wiring terminal. The multi-end pressure transmitter is used for realizing mutual connection of a plurality of pressure transmitters; the value taking circuit is used for selecting an output signal of the multi-end pressure transmitter 1; the processor CPU is used for realizing data exchange and hardware control; according to the PCV valve controller pressure sensing control circuit, through the arrangement of the multi-end pressure transmitter and the value taking circuit, processed controller transmission signals can be directly connected to an interface of the controller pressure transmitter, a large number of external electric appliances are avoided, and meanwhile the stability of the circuit can be improved through the arrangement of the voltage stabilizing circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of monitoring and analysis, in particular to a pressure sensing control circuit of a PCV valve controller. Background Art

[0002] The pressure sensing part of the PCV valve controller (MVC5000) is an essential part of the controller to realize the automatic control of the PCV valve. Its working principle is to first set a pressure value for the opening of the PCV valve, namely Setpressure, through the controller LCD panel. Then a 4-20MA analog quantity is transmitted to the controller through the pressure transmitter installed in the main steam pipeline (high-pressure superheater). When the pressure of the main steam pipeline reaches the pressure value (Set pressure) for the opening of the PCV valve, the valve automatically opens and the steam of the main steam pipeline is discharged. In general, when the pressure drops to 98% of the pressure value (Set pressure) for the opening of the PCV valve, the valve automatically closes.

[0003] The original PCV valve pressure sensor is a pressure transmitter installed in the main steam pipeline that transmits signals to the controller (MVC5000). Due to the importance of the PCV valve, users feel that installing a pressure transmitter is unsafe and usually require the equipment manufacturer to install three pressure transmitters. By understanding the working principle of the controller (MVC5000), it is found that installing three pressure transmitters is not possible through the controller itself. It can only be done by processing the signal outside the controller and then connecting it to the interface of the controller pressure transmitter. Utility Model Content

[0004] The utility model aims to provide a PCV valve controller pressure sensing control circuit to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a PCV valve controller pressure sensing control circuit, including a multi-terminal pressure transmitter, a value circuit, a processor CPU, a voltage stabilizing circuit, a power supply terminal, a circuit output terminal and a controller terminal:

[0006] The multi-terminal pressure transmitter is used to realize the interconnection of multiple pressure transmitters;

[0007] The value circuit is used for selecting the output signal of the multi-terminal pressure transmitter 1;

[0008] The processor CPU is used to realize data exchange and hardware control;

[0009] The input end of the voltage stabilizing circuit is connected to the output end of the power supply wiring terminal, and the voltage stabilizing circuit is used to provide a stable input voltage for the system;

[0010] The power terminal is used to connect an external power source to provide input voltage for the system;

[0011] The input end of the circuit output end is connected to the output end of the processor CPU;

[0012] The controller connection terminal is used to connect the circuit output end.

[0013] Furthermore, the value-taking circuit includes:

[0014] A signal input circuit, the signal input circuit is used to receive a plurality of controller transmission signals sent by a multi-terminal pressure transmitter;

[0015] A control signal receiving circuit, the control signal receiving circuit is used to receive a control signal input by a staff member, the control signal includes an average value signal and a maximum value signal;

[0016] A mean value circuit, the mean value circuit is used to receive the mean value signal sent by the control signal receiving circuit;

[0017] A maximum value circuit is used to receive a maximum value signal sent by a control signal receiving circuit.

[0018] Furthermore, the specific working steps of the value taking circuit include:

[0019] A1, the signal input circuit is used to receive multiple controller transmission signals sent by the multi-terminal pressure transmitter;

[0020] A2, the control signal receiving circuit is used to receive the control signal input by the staff, if the control signal input by the staff is a mean value signal, then execute step A3, if the control signal input by the staff is a maximum value signal, then execute step A4;

[0021] A3, receiving the averaging signal sent by the control signal receiving circuit through the averaging circuit, and starting the averaging circuit;

[0022] A4, receiving the maximum value signal sent by the control signal receiving circuit through the maximum value circuit, and starting the maximum value circuit.

[0023] Furthermore, the output ends of the plurality of pressure transmitters are connected to the input end of the value taking circuit, and the input ends of the plurality of pressure transmitters are connected to the output end of the voltage stabilizing circuit.

[0024] Further, the specific working steps include:

[0025] S1, multiple pressure transmitters are connected to each other through a multi-terminal pressure transmitter;

[0026] S2, connects to an external power source through the power terminal to provide input voltage for the system;

[0027] S3, stabilizing the power supply connected in step S1 by a voltage stabilizing circuit;

[0028] S4, receiving the control signal from the staff through the value-taking circuit, and realizing the output signal selection of the multi-terminal pressure transmitter;

[0029] S5, transmitting the output signal selected in step S2 to the processor CPU;

[0030] S6, the output signal received by the processor CPU is output through the circuit output terminal;

[0031] S7, receiving the controller transmission signal output from the output end of the circuit through the controller wiring terminal.

[0032] Compared with the prior art, the utility model provides a PCV valve controller pressure sensing control circuit, which can realize the direct access of the processed controller transmission signal to the interface of the controller pressure transmitter through the setting of a multi-terminal pressure transmitter and a value-taking circuit, thereby avoiding a large number of external electrical appliances. At the same time, the stability of the circuit can be increased by setting a voltage stabilizing circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0034] Figure 1 A system structure block diagram provided for an embodiment of the utility model.

[0035] Figure numerals: 1, multi-terminal pressure transmitter; 2, value-taking circuit; 3, processor CPU; 4, voltage stabilizing circuit; 5, power supply terminal; 6, circuit output terminal; 7, controller terminal. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] See also Figure 1 A PCV valve controller pressure sensing control circuit includes a multi-terminal pressure transmitter 1, a value circuit 2, a processor CPU 3, a voltage stabilizing circuit 4, a power supply terminal 5, a circuit output terminal 6, and a controller terminal 7:

[0038] The multi-terminal pressure transmitter 1 is used to realize the interconnection of multiple pressure transmitters;

[0039] The value circuit 2 is used for selecting the output signal of the multi-terminal pressure transmitter 1;

[0040] The processor CPU3 is used to realize data exchange and hardware control;

[0041] The input end of the voltage stabilizing circuit 4 is connected to the output end of the power supply terminal 5, and the voltage stabilizing circuit 4 is used to provide a stable input voltage for the system;

[0042] The power terminal 5 is used to connect an external power source to provide input voltage for the system;

[0043] The input end of the circuit output terminal 6 is connected to the output end of the processor CPU3;

[0044] The controller connection terminal 7 is used to connect to the circuit output terminal 6 .

[0045] Furthermore, the value obtaining circuit 2 comprises:

[0046] A signal input circuit, the signal input circuit is used to receive multiple controller transmission signals sent by the multi-terminal pressure transmitter 1;

[0047] A control signal receiving circuit, the control signal receiving circuit is used to receive a control signal input by a staff member, the control signal includes an average value signal and a maximum value signal;

[0048] A mean value circuit, the mean value circuit is used to receive the mean value signal sent by the control signal receiving circuit;

[0049] A maximum value circuit is used to receive a maximum value signal sent by a control signal receiving circuit.

[0050] Furthermore, the specific working steps of the value taking circuit 2 include:

[0051] A1, the signal input circuit is used to receive multiple controller transmission signals sent by the multi-terminal pressure transmitter 1;

[0052] A2, the control signal receiving circuit is used to receive the control signal input by the staff, if the control signal input by the staff is a mean value signal, then execute step A3, if the control signal input by the staff is a maximum value signal, then execute step A4;

[0053] A3, receiving the averaging signal sent by the control signal receiving circuit through the averaging circuit, and starting the averaging circuit;

[0054] A4, receiving the maximum value signal sent by the control signal receiving circuit through the maximum value circuit, and starting the maximum value circuit.

[0055] Furthermore, the output ends of the plurality of pressure transmitters are connected to the input end of the value taking circuit 2 , and the input ends of the plurality of pressure transmitters are connected to the output end of the voltage stabilizing circuit 4 .

[0056] Further, the specific working steps include:

[0057] S1, multiple pressure transmitters are connected to each other through a multi-terminal pressure transmitter 1;

[0058] S2, connects an external power supply through the power terminal 5 to provide input voltage for the system;

[0059] S3, stabilizing the power supply connected in step S1 by means of a voltage stabilizing circuit 4;

[0060] S4, receiving the staff control signal through the value circuit 2, and realizing the output signal selection of the multi-terminal pressure transmitter 1;

[0061] S5, transmitting the output signal selected in step S2 to the processor CPU3;

[0062] S6, the output signal received by the processor CPU3 is output through the circuit output terminal 6;

[0063] S7, receiving the controller transmission signal outputted from the circuit output terminal 6 via the controller connection terminal 7.

[0064] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A PCV valve controller pressure sensing control circuit, characterized in that: The invention comprises a multi-terminal pressure transmitter (1), a value-taking circuit (2), a processor CPU (3), a voltage stabilizing circuit (4), a power supply terminal (5), a circuit output terminal (6), and a controller terminal (7): The multi-terminal pressure transmitter (1) is used to realize the interconnection of multiple pressure transmitters; The value-taking circuit (2) is used for selecting the output signal of the multi-terminal pressure transmitter (1); The processor CPU (3) is used to implement data exchange and hardware control; The input end of the voltage stabilizing circuit (4) is connected to the output end of the power supply terminal (5), and the voltage stabilizing circuit (4) is used to provide a stable input voltage for the system; The power connection terminal (5) is used to connect an external power source to provide input voltage for the system; The input end of the circuit output terminal (6) is connected to the output end of the processor CPU (3); The controller connection terminal (7) is used to connect to the circuit output end (6).

2. A PCV valve controller pressure sensing control circuit according to claim 1, characterized in that: The value-taking circuit (2) comprises: A signal input circuit, the signal input circuit being used to receive a plurality of controller transmission signals sent by a multi-terminal pressure transmitter (1); A control signal receiving circuit, the control signal receiving circuit is used to receive a control signal input by a staff member, the control signal includes an average value signal and a maximum value signal; A mean value circuit, the mean value circuit is used to receive the mean value signal sent by the control signal receiving circuit; A maximum value circuit is used to receive a maximum value signal sent by a control signal receiving circuit.

3. A PCV valve controller pressure sensing control circuit according to claim 1, characterized in that: The output ends of the plurality of pressure transmitters are connected to the input end of the value taking circuit (2), and the input ends of the plurality of pressure transmitters are connected to the output end of the voltage stabilizing circuit (4).

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