Negative pressure field calibration device and method for pressure scanning valve

Abstract

The invention belongs to the field of aviation and spaceflight, and particularly relates to a negative pressure field calibration device and method for a pressure scanning valve, and the device comprises a pressure controller which is provided with a reference output end and a measurement / control output end, and the pressure difference of output gas of the reference output end and the measurement / control output end is a standard value; the pressure scanning valve is provided with a calibration end and a reference end; the valve specifically comprises a first valve for controlling the measurement / control output end to be communicated with the calibration end; the second valve is used for controlling the measurement / control output end to be communicated with the reference end; the third valve is used for controlling the reference output end to be communicated with the calibration end; the fourth valve controls the reference output end to be communicated with the reference end; the connection mode of the pressure scanning valve and the pressure controller is changed by opening or closing different valves, and the positive pressure, the negative pressure and the zero point of the pressure scanning valve can be calibrated at the same time.

Description

Technical Field

[0001] The present application belongs to the field of aviation and aerospace, and in particular relates to a negative pressure on-site calibration device and method for a pressure scanning valve. Background Art

[0002] Pressure scanning valves are widely used in weapons and equipment tests in the aviation and aerospace fields. Compared with traditional pressure measuring instruments, they have the advantages of high intelligence, good integration, high accuracy, and good stability, and can realize the synchronous collection of multiple pressure points at the test site. At present, the pressure scanning valve used for field testing has a measurement lower limit of -95kPa.

[0003] In order to ensure the accuracy of the pressure scanning valve measurement results, it is necessary to carry out full-range calibration of the pressure scanning valve. The existing negative pressure calibration device of the pressure scanning valve is an integrated system of a digital pressure controller and a vacuum pump, in which the digital pressure controller serves as the negative pressure standard source and the vacuum pump serves as the power to achieve negative pressure. Summary of the invention

[0004] In order to solve the above problems, the present application provides a negative pressure field calibration device for a pressure scanning valve, comprising:

[0005] The pressure controller has a reference output terminal and a measuring / control output terminal, and the pressure difference of the output gas between the reference output terminal and the measuring / control output terminal is a standard value;

[0006] A pressure scanning valve having a calibration end and a reference end;

[0007] Valves, including:

[0008] A first valve for controlling the communication between the measurement / control output terminal and the calibration terminal;

[0009] A second valve controlling the measurement / control output terminal to be connected to the reference terminal;

[0010] a third valve controlling the reference output terminal to be connected to the calibration terminal;

[0011] a fourth valve controlling the reference output terminal to be connected to the reference terminal;

[0012] Choose to open or close different valves to change the connection method between the pressure scanning valve and the pressure controller.

[0013] Preferably, the valve is integrated on the first reversing valve and the second reversing valve, and the first reversing valve and the second reversing valve each have two inlets and one outlet, and each inlet is connected to the outlet through one of the valves; one inlet of the first reversing valve and the second reversing valve is connected to the reference output end of the pressure controller, and the other inlet is connected to the measurement / control output end of the pressure controller, the outlet of the first reversing valve is connected to the calibration end of the pressure scanning valve, and the outlet of the second reversing valve is connected to the reference end of the pressure scanning valve.

[0014] Preferably, the reference output terminal outputs standard atmospheric pressure, and the measurement / control output terminal outputs a positive pressure greater than the standard atmospheric pressure.

[0015] Preferably, the reference output terminal is connected to an atmosphere stabilizing device for stabilizing the standard atmospheric pressure.

[0016] A method for on-site calibration of negative pressure of a pressure scanning valve is provided, using the on-site calibration device for negative pressure of a pressure scanning valve, and the steps of the calibration method include:

[0017] Open the first valve, close the second valve, close the third valve, and open the fourth valve;

[0018] Output gas with standard pressure difference through the reference output terminal and the measurement / control output terminal of the pressure controller;

[0019] The pressure difference between the gas at the input calibration end and the reference end is measured by a pressure scanning valve;

[0020] Calibration end of pressure scanning valve based on standard pressure difference and pressure difference calibration;

[0021] Close the first valve, open the second valve, open the third valve, and close the fourth valve;

[0022] Output gas with standard pressure difference through the reference output terminal and the measurement / control output terminal of the pressure controller;

[0023] The pressure difference between the gas at the input calibration end and the reference end is measured by a pressure scanning valve;

[0024] The calibration end of the pressure scanner is calibrated based on the standard pressure difference and the pressure difference.

[0025] Preferably, the pneumatic logic unit controls the opening or closing of the first valve, the second valve, the third valve and the fourth valve, and the pneumatic logic unit is provided with positive pressure and negative pressure state selection. When the positive pressure state is selected, the first valve is opened, the second valve is closed, the third valve is closed, and the fourth valve is opened. When the negative pressure state is selected, the first valve is closed, the second valve is opened, the third valve is opened, and the fourth valve is closed.

[0026] Preferably, the pneumatic logic unit is provided with a zero calibration state, and when the zero calibration state is selected:

[0027] Open the first valve, open the second valve, close the third valve, and close the fourth valve;

[0028] Or close the first valve, close the second valve, open the third valve, and open the fourth valve;

[0029] Gas with zero pressure difference is inputted into the calibration end and the reference end of the pressure scanning valve to realize the correction of the zero point of the pressure controller and the pressure scanning valve.

[0030] The advantages of the present application include: the present application realizes the calibration of the negative pressure of the pressure scanning valve by changing the loading mode of the standard pressure during the on-site calibration of the pressure scanning valve. Compared with the existing negative pressure calibration method of the pressure scanning valve, the negative pressure control range is greatly improved, the negative pressure control efficiency is greatly improved, the negative pressure calibration stabilization time is greatly reduced, and the negative pressure control stability of the calibration system is greatly improved, which overcomes the difficulties that the lower limit of the negative pressure is difficult to achieve through vacuuming, the standard pressure stability is poor, and the on-site calibration efficiency is insufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a schematic diagram of a negative pressure field calibration device for a pressure scanning valve.

[0032] Figure 2 The invention is a flow chart of a method for negative pressure on-site calibration of a pressure scanning valve. DETAILED DESCRIPTION

[0033] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in detail and in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0034] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0035] like Figure 1 As shown, in order to solve the above problems, the present application provides a negative pressure field calibration device for a pressure scanning valve, comprising:

[0036] The pressure controller has a reference output terminal and a measuring / control output terminal, and the pressure difference of the output gas between the reference output terminal and the measuring / control output terminal is a standard value;

[0037] A pressure scanning valve having a calibration end and a reference end;

[0038] A valve, wherein the valve is integrated on a first reversing valve and a second reversing valve, wherein the first reversing valve and the second reversing valve each have two inlets and one outlet, and each inlet is connected to the outlet through one of the valves; an inlet of the first reversing valve and the second reversing valve is connected to a reference output end of a pressure controller, and the other inlet is connected to a measurement / control output end of the pressure controller, the outlet of the first reversing valve is connected to a calibration end of a pressure scanning valve, and the outlet of the second reversing valve is connected to a reference end of the pressure scanning valve; Figure 1 In the invention, the first valve, the second valve, the third valve and the fourth valve are respectively directional valves;

[0039] Wherein, the first reversing valve has:

[0040] A first valve that controls the measurement / control output terminal to be connected to the calibration terminal, and a third valve that controls the reference output terminal to be connected to the calibration terminal;

[0041] The second reversing valve has:

[0042] A second valve is controlled to connect the measurement / control output terminal to the reference terminal, and a fourth valve is controlled to connect the reference output terminal to the reference terminal.

[0043] Choose to open or close different valves to change the connection method between the pressure scanning valve and the pressure controller.

[0044] Preferably, the reference output terminal outputs standard atmospheric pressure, and the measurement / control output terminal outputs a positive pressure greater than the standard atmospheric pressure.

[0045] Preferably, the reference output terminal is connected to an atmosphere stabilizing device for stabilizing the standard atmospheric pressure.

[0046] A method for on-site calibration of negative pressure of a pressure scanning valve, such as Figure 2 As shown, the pressure scanning valve negative pressure on-site calibration device is used, and the calibration method steps include:

[0047] Open the first valve, close the second valve, close the third valve, and open the fourth valve;

[0048] Output gas with standard pressure difference through the reference output terminal and the measurement / control output terminal of the pressure controller;

[0049] The pressure difference between the gas at the input calibration end and the reference end is measured by a pressure scanning valve;

[0050] Calibration end of pressure scanning valve based on standard pressure difference and pressure difference calibration;

[0051] Close the first valve, open the second valve, open the third valve, and close the fourth valve;

[0052] Output gas with standard pressure difference through the reference output terminal and the measurement / control output terminal of the pressure controller;

[0053] The pressure difference between the gas at the input calibration end and the reference end is measured by a pressure scanning valve;

[0054] The calibration end of the pressure scanner is calibrated based on the standard pressure difference and the pressure difference.

[0055] Preferably, the pneumatic logic unit controls the opening or closing of the first valve, the second valve, the third valve and the fourth valve, and the pneumatic logic unit is provided with positive pressure and negative pressure state selection. When the positive pressure state is selected, the first valve is opened, the second valve is closed, the third valve is closed, and the fourth valve is opened. When the negative pressure state is selected, the first valve is closed, the second valve is opened, the third valve is opened, and the fourth valve is closed.

[0056] Preferably, the pneumatic logic unit is provided with a zero calibration state, and when the zero calibration state is selected:

[0057] Open the first valve, open the second valve, close the third valve, and close the fourth valve;

[0058] Or close the first valve, close the second valve, open the third valve, and open the fourth valve;

[0059] Gas with zero pressure difference is inputted into the calibration end and the reference end of the pressure scanning valve to realize the correction of the zero point of the pressure controller and the pressure scanning valve.

[0060] The calibration process is as follows: after the pressure controller receives the pressure control command, it immediately transmits the command to the pneumatic logic unit. After the pneumatic logic unit identifies the positive and negative pressures, it switches the reversing valve according to the pre-designed logic to achieve calibration (positive pressure) and reference (negative pressure) state selection. After completion, it feeds back to the pressure controller. After receiving the feedback, the pressure controller controls the output of the standard pressure to achieve output switching of positive and negative pressures.

[0061] The advantages of the present application include: the present application realizes the calibration of the negative pressure of the pressure scanning valve by changing the loading mode of the standard pressure during the on-site calibration of the pressure scanning valve. Compared with the existing negative pressure calibration method of the pressure scanning valve, the negative pressure control range is greatly improved, the negative pressure control efficiency is greatly improved, the negative pressure calibration stabilization time is greatly reduced, and the negative pressure control stability of the calibration system is greatly improved, which overcomes the difficulties that the lower limit of the negative pressure is difficult to achieve through vacuuming, the standard pressure stability is poor, and the on-site calibration efficiency is insufficient.

[0062] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A negative pressure field calibration device for a pressure scanning valve, characterized in that: include: The pressure controller has a reference output terminal and a measuring / control output terminal, and the pressure difference of the output gas between the reference output terminal and the measuring / control output terminal is a standard value; A pressure scanning valve having a calibration end and a reference end; Valves, including: A first valve for controlling the communication between the measurement / control output terminal and the calibration terminal; A second valve controlling the measurement / control output terminal to be connected to the reference terminal; a third valve controlling the reference output terminal to be connected to the calibration terminal; a fourth valve controlling the reference output terminal to be connected to the reference terminal; Choose to open or close different valves to change the connection method between the pressure scanning valve and the pressure controller.

2. The negative pressure field calibration device for a pressure scanning valve as claimed in claim 1, characterized in that: The valve is integrated on the first reversing valve and the second reversing valve. The first reversing valve and the second reversing valve each have two inlets and one outlet, and each inlet is connected to the outlet through one of the valves; one inlet of the first reversing valve and the second reversing valve is connected to the reference output end of the pressure controller, and the other inlet is connected to the measurement / control output end of the pressure controller, the outlet of the first reversing valve is connected to the calibration end of the pressure scanning valve, and the outlet of the second reversing valve is connected to the reference end of the pressure scanning valve.

3. The negative pressure field calibration device for a pressure scanning valve as claimed in claim 1, characterized in that: The reference output terminal outputs standard atmospheric pressure, and the measurement / control output terminal outputs a positive pressure greater than the standard atmospheric pressure.

4. The negative pressure field calibration device for a pressure scanning valve as claimed in claim 1, characterized in that: The reference output terminal is connected to an atmospheric stabilization device for stabilizing the standard atmospheric pressure.

5. A method for on-site calibration of negative pressure of a pressure scanning valve, characterized in that: The negative pressure field calibration device for a pressure scanning valve according to any one of claims 1 to 4 is adopted, and the calibration method comprises the following steps: Open the first valve, close the second valve, close the third valve, and open the fourth valve; Output gas with standard pressure difference through the reference output terminal and the measurement / control output terminal of the pressure controller; The pressure difference between the gas at the input calibration end and the reference end is measured by a pressure scanning valve; Calibration end of pressure scanning valve based on standard pressure difference and pressure difference calibration; Close the first valve, open the second valve, open the third valve, and close the fourth valve; Output gas with standard pressure difference through the reference output terminal and the measurement / control output terminal of the pressure controller; The pressure difference between the gas at the input calibration end and the reference end is measured by a pressure scanning valve; The calibration end of the pressure scanner is calibrated based on the standard pressure difference and the pressure difference.

6. The method for on-site calibration of negative pressure of a pressure scanning valve as claimed in claim 5, characterized in that: The pneumatic logic unit controls the opening or closing of the first valve, the second valve, the third valve and the fourth valve. The pneumatic logic unit is provided with positive pressure and negative pressure state selection. When the positive pressure state is selected, the first valve is opened, the second valve is closed, the third valve is closed, and the fourth valve is opened. When the negative pressure state is selected, the first valve is closed, the second valve is opened, the third valve is opened, and the fourth valve is closed.

7. The method for on-site calibration of negative pressure of a pressure scanning valve according to claim 5, characterized in that: The pneumatic logic unit is also provided with a zero calibration state. When the zero calibration state is selected, Open the first valve, open the second valve, close the third valve, and close the fourth valve; Or close the first valve, close the second valve, open the third valve, and open the fourth valve; Gas with zero pressure difference is inputted into the calibration end and the reference end of the pressure scanning valve to realize the correction of the zero point of the pressure controller and the pressure scanning valve.

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