Liquid level testing equipment applicable to range filling

Abstract

The present invention provides a liquid level testing device applicable to range filling. The signal conditioning module is used to condition and filter the voltage signals to be collected, and transmit the conditioned and filtered voltage signals to the signal acquisition module; the signal acquisition module is used to collect the voltage signals and transmit the collected voltage signals to the DSP processing module; the DSP processing module is used to process the voltage signals and transmit the processed voltage signals to the network communication module and the serial communication module; the network communication module is used to realize the transmission and communication function with the host computer; the serial communication module is used to realize the serial communication function with external devices; the network communication module and the serial communication module are connected to the human-machine interaction panel. The present invention can complete the monitoring function of the liquid level height of the first and second stages of the rocket, realize the simultaneous power supply and data acquisition for different types and multiple capacitive cryogenic liquid level sensors, improve the data monitoring efficiency, and has high measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level measurement. Specifically, it relates to a liquid level testing device suitable for filling at the firing range, and in particular, to a liquid level testing device for filling a launch vehicle at the firing range, which is suitable for monitoring and controlling the liquid level height during ground filling of a launch vehicle. Background Art

[0002] In many fields, real-time liquid level measurement can accurately reflect the current state information. For example, during the filling and flight of a liquid rocket, the liquid level information of the propellant in the storage tank is a key parameter in the rocket control system, directly participating in the adjustment of the control system and being one of the key factors determining the success or failure of a launch. New-generation launch vehicles widely use non-toxic and pollution-free liquid propellants such as liquid hydrogen, liquid oxygen, and kerosene, replacing the highly toxic and dangerous conventional propellants. When filling low-temperature propellants, high-precision liquid level measurement is required. However, the liquid level of the propellant changes rapidly, the temperature varies, and the liquid surface shakes, etc.

[0003] Currently, due to the limited methods for measuring the liquid level of low-temperature propellants in liquid rockets in China, the main means for measuring specific liquid level points of low-temperature fuels in the domestic and international aerospace fields is the annular capacitive liquid level sensor. The annular capacitive liquid level sensor is based on the fact that different media have different dielectric constants. Its sensor sensitive capacitance is a multi-layer annular capacitor composed of an inner ring and an outer ring. When liquid flows into or out of the multi-layer annular capacitor, it causes a change in the dielectric constant, thereby causing a change in capacitance. After being converted into a voltage signal by a liquid level transducer, the voltage signal is output to the backend device.

[0004] However, there are many types of liquid level transducers participating in the filling in the storage tank, and it is necessary to collect and measure them simultaneously, and pack and transmit the output voltage signals to the backend device, so as to clearly obtain the liquid level information in each storage tank remotely during filling. The reliability of the liquid level signals sent by a single capacitive liquid level sensor and its processing circuit is low. If any group of sensors or transducers fails, it will inevitably send out incorrect liquid level signals. If the data of multiple sensors and transducers in the storage tank cannot be processed and compared in time, it may lead to mistakes in propellant filling and affect the rocket launch.

[0005] Therefore, during the ground propellant filling stage of a launch vehicle, it is crucial to use ground filling equipment to collect the liquid level signals in the storage tank, calculate the current liquid level height, and transmit it to the measurement system in real time, which has important significance in the aviation, aerospace and related fields.

[0006] The patent document with the publication number CN109592082A discloses a device for detecting signals of a rocket power filling system. To solve the problems of numerous meter heads in the filling warehouse of the firing range, inability to realize real-time linkage of data between the front and rear ends of the filling system, and weak universality among different models, this patent document provides a general-purpose rocket power filling system signal acquisition device based on RS485, which can centralize the front-end warehouse meter heads in one combination and achieve the purpose of broadcasting and sharing the front and rear end data in real time, and can be assembled in the power filling systems of different models of rockets. However, this patent document still has the defect that the reliability of the liquid level signal sent by using a single capacitive liquid level sensor and its processing circuit is low. Summary of the Invention

[0007] Aiming at the defects in the prior art, the purpose of the present invention is to provide a liquid level testing device suitable for filling in the firing range.

[0008] A liquid level testing device suitable for filling in the firing range according to the present invention includes: a human-computer interaction panel and a filling liquid level detection unit;

[0009] The filling liquid level detection unit includes: a signal conditioning module, a signal acquisition module, a DSP processing module, a network communication module, and a serial port communication module;

[0010] The signal conditioning module is used to condition and filter the voltage signal to be collected, and send the conditioned and filtered voltage signal to the signal acquisition module;

[0011] The signal acquisition module is used to collect the voltage signal and send the collected voltage signal to the DSP processing module;

[0012] The DSP processing module is used to process the voltage signal and send the processed voltage signal to the network communication module and the serial port communication module;

[0013] The network communication module is used to realize the transmission and communication function with the upper computer; the serial port communication module is used to realize the serial port communication function with external devices;

[0014] The network communication module and the serial port communication module are connected to the human-computer interaction panel;

[0015] The signal acquisition module includes: a passive switch signal acquisition circuit and an analog voltage signal acquisition circuit;

[0016] The passive switch signal acquisition circuit is used to collect passive switch signals, and the analog voltage signal acquisition circuit is used to collect analog voltage signals;

[0017] The analog voltage signal acquisition circuit includes: a point-type intermediate voltage signal acquisition circuit, and a continuous triangular wave and linear wave acquisition circuit;

[0018] The signals acquired by the signal acquisition module include: a passive switch signal and an analog voltage signal;

[0019] The signal conditioning module includes: a point-type intermediate voltage signal conditioning module circuit, and a continuous triangular wave and linear wave signal conditioning circuit;

[0020] The output end of the point-type intermediate voltage signal conditioning module circuit is connected to the input end of the point-type intermediate voltage signal acquisition circuit;

[0021] The output end of the continuous triangular wave and linear wave signal conditioning circuit is connected to the input end of the continuous triangular wave and linear wave acquisition circuit.

[0022] Preferably, the liquid level testing device further includes: a power supply module;

[0023] The power supply module is used to supply power to the signal conditioning module, the signal acquisition module, the DSP processing module, the network communication module, and the serial port communication module.

[0024] Preferably, a differential operational amplifier circuit is provided between the signal conditioning module and the signal acquisition module;

[0025] The voltage signal output by the signal conditioning module is differentially processed by the differential operational amplifier circuit and then input to the signal acquisition module.

[0026] Preferably, the DSP processing module includes: a digital signal processor and a processor peripheral circuit;

[0027] The digital signal processor and the processor peripheral circuit are used to implement the following functions: digital quantity signal processing, power-on and power-off control, indicator light control, acquisition data packaging, remote control / local control switching;

[0028] The model of the digital signal processor is TMS320F28335.

[0029] Preferably, the network communication module includes: a network communication circuit one and a network communication circuit two;

[0030] The network communication circuit one is the main network port, and the network communication circuit two is the slave network port. When the main network port fails, it can be directly switched to the slave network port.

[0031] Preferably, the power supply module includes: three independent AC / DC power supply modules;

[0032] The three AC / DC power modules respectively supply power to the device itself and two groups of output interfaces. The output voltages of the two AC / DC power modules that supply power to the two groups of output interfaces can be adjusted, and the adjustment range of the output voltage is 27V to 32V.

[0033] Preferably, the differential operational amplifier circuit includes: an operational amplifier, a gain amplifier, a capacitor, and a resistor;

[0034] The model of the operational amplifier is OPA188AID, and the model of the gain amplifier is AD628AR.

[0035] Preferably, the point-type intermediate voltage signal acquisition circuit is excited by a 12V signal, isolated by an opto-isolator, and then input to the IO acquisition;

[0036] The point-type intermediate voltage signal acquisition circuit uses a 16-bit 8-channel synchronous sampling chip and a COMS switch to form a switching matrix for step-by-step acquisition;

[0037] The continuous triangular wave and linear wave acquisition circuit uses a precision 24-bit analog-to-digital converter with 20-bit effective resolution, and the sampling accuracy can reach 0.001V;

[0038] The model of the 16-bit 8-channel synchronous sampling chip is AD7606, the model of the COMS switch is DG408DY+, and the model of the precision 24-bit analog-to-digital converter is ADS1220IPWR.

[0039] Preferably, the W5300 module is used in the network communication module, which supports TCP protocol and UDP protocol;

[0040] The network communication module operates in full-duplex mode and can automatically correct the signal polarity;

[0041] There is a 16KB memory inside the network communication module for data transmission / reception buffering, which can meet the transmission rate adaptability, and the transmission rate can reach 100Mbps;

[0042] The serial communication module includes: a serial communication chip and a digital isolation chip;

[0043] The signal output by the DSP processing module is converted by the serial communication chip and then output through the digital isolation chip;

[0044] The model of the serial communication chip is MAX490E, and the model of the digital isolation chip is ADuM1201ARZ.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. The present invention uses a differential circuit for pre-signal conditioning to achieve accurate acquisition of various voltage signals without interference. A multi-channel AD sampling chip and a COMS switch are used for multi-channel voltage signal acquisition. For the case where there are many types of converters involved in the filling of the storage tank and simultaneous acquisition and measurement are required, it ensures that multi-channel signals are acquired simultaneously.

[0047] 2. The present invention uses network transmission to remotely and clearly obtain the liquid level information in each storage tank in real time, and can realize the power-on and power-off of the liquid level converter in real time, and achieve the debugging, analysis and display of various filling signals.

[0048] 3. The present invention simultaneously collects the signals of point-type and continuous-type converters. After remote network transmission, it can realize the measurement of the liquid level height of multiple storage tanks with full range, and the measurement error is less than ±2 mm, with high accuracy, and is applicable to the filling of various storage tanks at the firing range. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Other features, objects and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0050] Figure 1 It is a schematic diagram of the system framework of the liquid level test equipment applicable to the filling of the firing range according to the present invention;

[0051] Figure 2 and Figure 3 It is a schematic diagram of the circuit structure of the signal conditioning circuit;

[0052] Figure 4 It is a schematic diagram of the circuit structure of the passive contact signal acquisition circuit;

[0053] Figure 5 It is a schematic diagram of the circuit structure of the point-type intermediate voltage signal acquisition circuit;

[0054] Figure 6 It is a schematic diagram of the circuit structure of the continuous triangular wave continuous wave sampling circuit;

[0055] Figure 7 It is a schematic diagram of the circuit structure of the DSP processing module;

[0056] Figure 7.1 It is Figure 7 a partial enlarged schematic diagram of the upper half in

[0057] Figure 7.2 It is Figure 7 a partial enlarged schematic diagram of the lower half in

[0058] Figure 8 It is a schematic diagram of the circuit structure of the network communication module;

[0059] Figure 9 Schematic diagram of the circuit structure of the serial communication module;

[0060] Figure 10 Schematic diagram of the structure of the outer shell of the liquid level testing device Figure 1 ;

[0061] Figure 10.1 is Figure 10 Partial enlarged schematic diagram of part A in

[0062] Figure 10.2 is Figure 10 Partial enlarged schematic diagram of part B in

[0063] Figure 10.3 is Figure 10 Partial enlarged schematic diagram of part C in

[0064] Figure 11 Schematic diagram of the structure of the outer shell of the liquid level testing device Figure 2 ;

[0065] Figure 12 Schematic diagram of the structure of the outer shell of the liquid level testing device Figure 3 ;

[0066] Figure 13 Schematic diagram of the structure of the outer shell of the liquid level testing device Figure 4 。 Detailed implementation manners

[0067] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0068] Embodiment 1:

[0069] Such as Figures 1 - 13As shown in the figure, this embodiment provides a liquid level testing device applicable to range filling, including: a human-machine interaction panel and a filling liquid level detection unit; the filling liquid level detection unit includes: a signal conditioning module, a signal acquisition module, a DSP processing module, a network communication module, and a serial communication module; the signal conditioning module is used to condition and filter the voltage signal to be collected, and transmit the conditioned and filtered voltage signal to the signal acquisition module; the signal acquisition module is used to collect the voltage signal and transmit the collected voltage signal to the DSP processing module; the DSP processing module is used to process the voltage signal and transmit the processed voltage signal to the network communication module and the serial communication module; the network communication module is used to realize the transmission and communication function with the upper computer; the serial communication module is used to realize the serial communication function with external devices; the network communication module and the serial communication module are connected to the human-machine interaction panel.

[0070] The liquid level testing device further includes: a power supply module; the power supply module is used to supply power to the signal conditioning module, the signal acquisition module, the DSP processing module, the network communication module, and the serial communication module.

[0071] The power supply module includes: three independent AC / DC power supply modules; the three AC / DC power supply modules respectively supply power to the device itself and two groups of output interfaces, and the output voltages of the two AC / DC power supply modules for supplying power to the two groups of output interfaces can be adjusted, and the adjustment range of the output voltage is 27V to 32V.

[0072] A differential operational amplifier circuit is provided between the signal conditioning module and the signal acquisition module; the voltage signal output by the signal conditioning module is differentially processed by the differential operational amplifier circuit and then input to the signal acquisition module. The differential operational amplifier circuit includes: an operational amplifier, a gain amplifier, a capacitor, and a resistor; the model of the operational amplifier is OPA188AID, and the model of the gain amplifier is AD628AR.

[0073] The signal conditioning module includes: a point-type intermediate voltage signal conditioning module circuit, and a continuous triangular wave and linear wave signal conditioning circuit.

[0074] The point-type intermediate voltage signal conditioning module circuit, as Figure 2 shown, includes: an operational amplifier, resistor R199, capacitor C356, resistor R192, resistor R195, capacitor C351, resistor R197, resistor R198, chip U75, diode D67, capacitor C559, capacitor C562, capacitor C563, resistor R422, and resistor R423. The model of chip U75 is AD628ARZ-R7.

[0075] The VI_IN signal is output from one end of resistor R423, and the other end of resistor R423 is respectively connected to one end of capacitor C562, one end of capacitor C563, the cathode of diode D67, and the +IN connection terminal of chip U75. The anode of diode D67 is grounded. The other end of capacitor C563 is grounded.

[0076] One end of resistor R422 is grounded, and the other end of resistor R422 is respectively connected to one end of capacitor C559, the other end of capacitor C562, and the -IN connection terminal of chip U75.

[0077] The FILT connection terminal of chip U75 is connected to one end of capacitor C351, and the other end of capacitor C351 is grounded. The OUT connection terminal of chip U75 is respectively connected to one end of resistor R197 and one end of resistor R195. The other end of resistor R197 is respectively connected to the RG connection terminal of chip U75 and one end of resistor R198, and the other end of resistor R198 is grounded.

[0078] The other end of resistor R195 is respectively connected to one end of resistor R192 and the non-inverting input terminal of the operational amplifier. The inverting input terminal of the operational amplifier is respectively connected to one end of resistor R199 and one end of capacitor C356. The other end of resistor R199 is respectively connected to the other end of capacitor C356 and the output terminal of the operational amplifier, and the output terminal of the operational amplifier outputs the VI signal.

[0079] After the VI_IN signal passes through the filter circuit and the gain amplifier AD628AR, it is input to the operational amplifier OPA188AID, and finally outputs VI through the follower amplifier circuit and inputs it to Figure 5 the voltage acquisition circuit shown in Figure 5 The voltage acquisition circuit is composed of a 16-bit 8-channel synchronous sampling chip AD7606 and a COMS switch to form a switching matrix DG408DY +, and performs acquisition step by step.

[0080] A continuous triangular wave and linear wave signal conditioning circuit, as Figure 3 shown, includes: an operational amplifier, resistor R428, capacitor C673, resistor R432, resistor R522, capacitor C674, resistor R523, resistor R524, resistor R525, capacitor C668, capacitor C669, capacitor C670, diode D118, diode D120, diode D119, and diode D121.

[0081] The triangular wave signal VI_SJB is input through the non-inverting input terminal of the operational amplifier. One end of the resistor R428 and one end of the capacitor C673 are respectively connected to the inverting input terminal of the operational amplifier. The input terminals of the operational amplifier are respectively connected to the other end of the resistor R428, the other end of the capacitor C673, one end of the resistor R432, and one end of the resistor R522. The VI_SJB signal is input to the other end of the resistor R432.

[0082] The other end of the resistor R522 is respectively connected to one end of the capacitor C674, one end of the resistor R524, and one end of the resistor R523.

[0083] The VI_SJB signal is input to the other end of the capacitor C674 and is respectively connected to the other end of the resistor R524 and one end of the resistor R525.

[0084] The other end of the resistor R523 is respectively connected to one end of the capacitor C668, one end of the capacitor C669, the positive electrode of the diode D118, and the negative electrode of the diode D119. The other end of the capacitor C668 is grounded. The negative electrode of the diode D118 is externally connected to a voltage, and the positive electrode of the diode D119 is grounded.

[0085] The other end of the resistor R525 is respectively connected to the other end of the capacitor C669, one end of the capacitor C670, the negative electrode of the diode D120, and the positive electrode of the diode D121. The other end of the capacitor C670 is grounded. The positive electrode of the diode D120 is grounded, and the negative electrode of the diode D121 is externally connected to a voltage.

[0086] After the input triangular wave signal VI_SJB is conditioned by the differential operational amplifier circuit, VI_SJB_A is output to the acquisition circuit. The acquisition circuit is as Figure 6 shown, and a precision 24-bit analog-to-digital converter is adopted, with 20-bit effective resolution, and the sampling accuracy can reach 0.001V;. The model of the precision 24-bit analog-to-digital converter is ADS1220IPWR.

[0087] The signal acquisition module includes: a passive switch signal acquisition circuit and an analog voltage signal acquisition circuit; the passive switch signal acquisition circuit is used to acquire passive switch signals, and the analog voltage signal acquisition circuit is used to acquire analog voltage signals.

[0088] The passive switch signal acquisition circuit, as Figure 4 shown, includes: chip U95, resistor R252, diode D77, capacitor C406, resistor R254, resistor R258, diode D79, capacitor C410, resistor R265, resistor R266, diode D80, capacitor C411, resistor R267, resistor R272, diode D82, capacitor C418, and resistor R275. The model of chip U95 is PS2801-4-A.

[0089] The D1+ connection terminal of chip U95 is respectively connected to one end of resistor R252 and the cathode of diode D77. The other end of resistor R252 is respectively connected to one end of capacitor C406 and one end of resistor R254. The anode of diode D77 is respectively connected to the D1- connection terminal of chip U95, the other end of capacitor C406, and the other end of resistor R254, and serves as the input terminal of the IN_YJZ1 signal.

[0090] The D2+ connection terminal of chip U95 is respectively connected to one end of resistor R258 and the cathode of diode D79. The other end of resistor R258 is respectively connected to one end of capacitor C410 and one end of resistor R265. The anode of diode D79 is respectively connected to the D2- connection terminal of chip U95, the other end of capacitor C410, and the other end of resistor R265, and serves as the input terminal of the IN_YJZ2 signal.

[0091] The D3+ connection terminal of chip U95 is respectively connected to one end of resistor R266 and the cathode of diode D80. The other end of resistor R266 is respectively connected to one end of capacitor C411 and one end of resistor R267. The anode of diode D80 is respectively connected to the D3- connection terminal of chip U95, the other end of capacitor C411, and the other end of resistor R267, and serves as the input terminal of the IN_YJZ3 signal.

[0092] The D4+ connection terminal of chip U95 is respectively connected to one end of resistor R272 and the cathode of diode D82. The other end of resistor R272 is respectively connected to one end of capacitor C418 and one end of resistor R275. The anode of diode D82 is respectively connected to the D4- connection terminal of chip U95, the other end of capacitor C418, and the other end of resistor R275, and serves as the input terminal of the IN_YJZ4 signal.

[0093] The passive switch signal acquisition circuit, as Figure 4 shown, further includes: chip U103, resistor R276, resistor R278, diode D84, capacitor C422, and resistor R282. The model of chip U103 is PS2801-1.

[0094] The T+ connection terminal of chip U103 is connected to one end of resistor R276, and the T- connection terminal of chip U103 is grounded.

[0095] The D+ connection terminal of chip U103 is respectively connected to one end of resistor R278 and the cathode of diode D84. The D- connection terminal of chip U103 is respectively connected to the anode of diode D84, the other end of capacitor C422, and the other end of resistor R282, and serves as the input terminal of the IN_YJZ5 signal.

[0096] IN_YJZ1 to IN_YJZ5 are point - type digital signals. After being excited by a 12V signal, they are input to the IO acquisition of the DSP after being converted by the isolation optocoupler PS2801.

[0097] The signals collected by the signal acquisition module include: passive switch signals and analog voltage signals. The analog voltage signal acquisition circuit includes: a point - type intermediate voltage signal acquisition circuit, and a continuous - type triangular wave and linear wave acquisition circuit; the point - type intermediate voltage signal acquisition circuit is excited by a 12V signal, isolated by an opto - isolator, and then input to the IO acquisition; the point - type intermediate voltage signal acquisition circuit uses a 16 - bit 8 - channel synchronous sampling chip and a COMS switch to form a switching matrix for step - by - step acquisition; the continuous - type triangular wave and linear wave acquisition circuit uses a precision 24 - bit analog - to - digital converter with 20 - bit effective resolution, and the sampling accuracy can reach 0.001V; the model of the 16 - bit 8 - channel synchronous sampling chip is AD7606, the model of the COMS switch is DG408DY +, and the model of the precision 24 - bit analog - to - digital converter is ADS1220IPWR.

[0098] The DSP processing module includes: a digital signal processor and the peripheral circuits of the processor; the digital signal processor and the peripheral circuits of the processor are used to implement the following functions: digital signal processing, power - on / off control, indicator light control, acquisition data packaging, remote control / local control switching; the model of the digital signal processor is TMS320F28335.

[0099] The network communication module includes: network communication circuit one and network communication circuit two; network communication circuit one is the main network port, and network communication circuit two is the slave network port. When the main network port fails, it can be directly switched to the slave network port. The W5300 module is used in the network communication module, which supports TCP protocol and UDP protocol; the network communication module uses a full - duplex working mode and can automatically correct the signal polarity; there is a 16KB memory inside the network communication module for data sending / receiving caching, which can meet the transmission rate self - adaptation, and the transmission rate can reach 100Mbps; the serial communication module includes: a serial communication chip and a digital isolation chip; the signal output by the DSP processing module is converted by the serial communication chip and then output through the digital isolation chip; the model of the serial communication chip is MAX490E, and the model of the digital isolation chip is ADuM1201ARZ.

[0100] The signal conditioning circuit, signal acquisition circuit and communication circuit of this embodiment are all different from the existing circuits. The signal circuit of this embodiment adopts the differential circuit acquisition method to avoid excessive errors caused by signal interference and can improve the acquisition accuracy. The acquisition accuracy of the equipment in this embodiment can reach 1mV.

[0101] In this embodiment, the communication module has two parts. One part is the serial communication module, and the other part is the network communication module. Both modules are double-backed up. The network module and the serial communication module can be hot-backed up during use. When one path has a problem, the other path will automatically connect to maintain communication.

[0102] In this embodiment, the device can realize the application of range filling through remote control. Existing devices require operators to operate on-site. When filling the range in this embodiment, the operator can perform remote control at a site hundreds of meters away from the launch site, and can realize multiple operations such as device self-check, power supply switch control, signal acquisition and display, etc., ensuring personnel safety.

[0103] The liquid level test device applicable to range filling further includes: an external housing.

[0104] As Figure 10 shown, the external housing is provided with a primary R tank point power supply interface, a primary Y tank point power supply interface, a primary Y tank continuous power supply interface, a secondary R tank point power supply interface, and a secondary Y tank point power supply interface.

[0105] As Figure 10 shown, the external housing is also provided with a triangular wave interface, a linear wave interface, a primary R tank point interface, a secondary R tank point interface, a primary Y tank point interface, a secondary Y tank point interface, and a primary Y tank continuous interface.

[0106] As Figure 10.2 shown, the external housing is also provided with a voltage regulation module, and the voltage regulation module includes: a primary R tank point voltage interface, a primary Y tank point voltage interface, a primary Y tank continuous voltage interface, a secondary R tank point voltage interface, and a secondary Y tank point voltage interface.

[0107] As Figure 10.3 shown, the external housing is also provided with a local control and remote control knob, a power switch, and a local control power supply interface.

[0108] The external housing is also provided with a measurement interface module, and the measurement interface module includes: a primary R tank point measurement interface, a primary Y tank point measurement interface, a primary Y tank continuous measurement interface, a secondary R tank point measurement interface, and a secondary Y tank point measurement interface.

[0109] As Figure 10.1 shown, the external housing is also provided with indicator lights and analog switches for the primary R tank, primary Y tank, secondary R tank, and secondary Y tank. The primary R tank is provided with indicator lights and analog switches from I to IV, the primary Y tank is provided with indicator lights and analog switches from I to V, the secondary R tank is provided with indicator lights and analog switches from I to IV, and the secondary Y tank is provided with indicator lights and analog switches from I to V.

[0110] As Figure 12As shown, a continuous signal self-check connection terminal is also provided on the outer shell, with marks of 0, Ⅰ, Ⅱ, Ⅲ, Ⅳ, 0. On the outer shell, there are also provided a first-level Y continuous interface labeled X1, a first-level Y point interface labeled X2, a first-level R point interface labeled X3, a second-level Y point interface labeled X4, a second-level R point interface labeled X5, an interface labeled X6, an interface labeled X7, an interface labeled X8, and an interface labeled X9.

[0111] As Figure 12 shown, a first-level Y continuous knob, a first-level Y point knob, a first-level R point knob, a second-level Y point knob, and a second-level R point knob are also provided on the outer shell.

[0112] As Figure 12 shown, a ground connection terminal, an AC / 220V connection terminal, and a buzzer are also provided on the outer shell.

[0113] Embodiment 2:

[0114] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0115] This embodiment provides a liquid level testing device applicable to range filling, which can improve the convenience and accuracy of measuring the liquid level signal of cryogenic propellants, and is especially applicable to the simultaneous measurement of multiple storage tanks and various liquid level signals during range filling.

[0116] This embodiment provides a liquid level testing device applicable to range filling, including a hardware circuit and a human-computer interaction panel, etc. The hardware circuit at least includes a signal conditioning module, a signal acquisition module, a DSP processing module, a network communication module, and a serial communication module.

[0117] The power supply module is used to supply power to various parts of the device; it includes three independent AC / DC power modules, which supply power to the device itself and two groups of output interfaces respectively. The two power modules for supplying power to the output interfaces are adjustable power supplies, which can meet the adjustable output range of 27V to 32V.

[0118] The signal conditioning module is used to condition and filter the voltage signal to be collected; after the voltage signal is differentially processed by a differential operational amplifier circuit, it is input to the signal acquisition module.

[0119] The analog voltage signal acquisition circuit includes: a point-type intermediate voltage signal acquisition circuit, and a continuous triangular wave and linear wave acquisition circuit; the point-type intermediate voltage conditioning module circuit, as Figure 2 shown. The VI_IN signal passes through a filter circuit and a gain amplifier AD628AR, and then is input to an operational amplifier OPA188AID. Through a follower amplifier circuit, finally, the VI output is input to Figure 5 the voltage acquisition circuit shown.Figure 5 The voltage acquisition circuit consists of a 16-bit, 8-channel synchronous sampling chip AD7606 and a switching matrix DG408DY+ composed of a COMS switch, and performs acquisition step by step.

[0120] The continuous triangular wave and linear wave signal conditioning circuit is as Figure 3 shown. After the input triangular wave signal VI_SJB is conditioned by a differential operation amplifier circuit, it outputs VI_SJB_A to the acquisition circuit. The acquisition circuit is as Figure 6 shown. It uses a precision 24-bit analog-to-digital converter with 20-bit effective resolution, and the sampling accuracy can reach 0.001V;. The model of the precision 24-bit analog-to-digital converter is ADS1220IPWR.

[0121] The signal conditioning module is used to condition and filter the voltage signal to be acquired; after the voltage signal is differentially processed by a differential operational amplifier circuit, it is input to the signal acquisition module.

[0122] The differential operational amplifier circuit of the continuous liquid level transducer signal conditioning module uses high-precision and low-power operational amplifiers OPA188AID, variable gain amplifiers AD8421AR, AD628AR, precision capacitors, and precision resistors.

[0123] The positive and negative terminals of the continuous liquid level transducer signal pass through an RC filter circuit composed of precision capacitors and resistors, and then pass through an amplifier circuit composed of a variable gain amplifier AD8421AR. When the voltage difference between the non-inverting input terminal and the inverting input terminal of the variable gain amplifier AD8421AR becomes larger, the voltages at both ends will tend to be equal. When the voltage at the inverting input terminal becomes higher, the output will change negatively, and then it is inverted by a high-precision operational amplifier OPA188AID and input into the signal acquisition module.

[0124] The point-type self-check signal and power supply voltage signal conditioning module is composed of an operational amplifier OPA188AID and a differential amplifier AD628. The point-type self-check signal and voltage signal pass through a clamping circuit composed of resistors and voltage regulators, and then pass through an amplifier circuit composed of a variable gain amplifier AD628AR. When the voltage difference between the non-inverting input terminal and the inverting input terminal of the variable gain amplifier AD628AR becomes larger, the voltages at both ends will tend to be equal. When the voltage at the inverting input terminal becomes higher, the output will change negatively, and then it is inverted by a high-precision operational amplifier OPA188AID and input into the acquisition module.

[0125] The signal acquisition module is used to acquire signals, and the acquired signals include passive switch signals and analog voltage signals. The point-type passive signal acquisition circuit uses a 12V signal excitation, is isolated by an opto-isolator, and then input to the IO acquisition; the analog voltage signals are divided into point-type intermediate voltage signal acquisition and continuous triangular wave and linear wave voltage acquisition. The point-type intermediate voltage signal acquisition circuit consists of a 16-bit 8-channel synchronous sampling chip and a COMS switch to form a switching matrix for step-by-step acquisition; the continuous triangular wave and linear wave acquisition circuit uses a precision 24-bit analog-to-digital converter with 20-bit effective resolution, which can ensure that the sampling accuracy reaches 0.001V.

[0126] The point-type intermediate voltage signal acquisition circuit includes a 16-bit 8-channel synchronous sampling chip AD7606 and a COMS switch DG408DY+; the precision 24-bit analog-to-digital converter in the continuous triangular wave and linear wave acquisition circuit is ADS1220IPWR.

[0127] The DSP processing module includes a digital signal processor and its peripheral circuits, and is used to complete functions such as digital signal processing, power-on and off control, indicator light control, acquisition data packaging, remote control / local control switching, etc.;

[0128] The digital signal processor is selected as TMS320F28335.

[0129] The network communication module is used for the transmission communication function with the upper computer software; it includes network communication circuit one and network communication circuit two. Network communication circuit one is the main network port, and network communication circuit two is the slave network port. When the main network port fails, it can be directly switched to the slave network port.

[0130] The network communication circuit uses a W5300 module, supports TCP and UDP protocols; adopts a full-duplex working mode, can automatically correct the signal polarity; has a 16KB memory inside for data sending / receiving caching, can meet the transmission rate self-adaptation, and the transmission rate can reach 100Mbps.

[0131] The serial communication module is used for the serial communication function with external devices;

[0132] The serial communication module includes a serial communication chip MAX490E and a digital isolation chip ADuM1201ARZ. The signal output by the DSP is converted by the serial communication chip and then output through the digital isolation chip to ensure that the signals do not interfere with each other.

[0133] The human-machine interaction panel includes five power supply control switches, an output adjustable knob, 7 digital displays, point-type signal indicator lights and analog switches, a remote control switching knob, an interface connected to the converter, a network communication interface, a serial communication interface, etc.

[0134] This embodiment provides a liquid level testing device applicable to range filling, including a human-machine interaction panel and a filling liquid level detection unit. Among them, the hardware circuit of the filling liquid level monitoring unit at least includes a power supply module, a signal conditioning module, an AD acquisition module, a DSP processing module, a network communication module, and a serial communication module. The liquid level testing device for range filling in this embodiment can complete the monitoring function of the filling liquid level height of the first and second stages of the rocket, realize the simultaneous power supply and data acquisition for different types and multiple capacitive cryogenic liquid level sensors, improve the data monitoring efficiency, and has high measurement accuracy. It can be remotely controlled and meets the requirements of expandability, integration, and portability of the testing device.

[0135] Embodiment 3:

[0136] Those skilled in the art can understand this embodiment as a more specific illustration of Embodiment 1.

[0137] As Figure 1 shown, this embodiment provides a liquid level testing device applicable to range filling, including the hardware circuit of the filling liquid level monitoring unit, a human-machine interaction panel, etc. The hardware circuit at least includes a power supply module, a signal conditioning module, a signal acquisition module, a DSP processing module, a network communication module, and a serial communication module.

[0138] Among them, the power supply module is used to supply power to various parts of the device; it includes three independent AC / DC power modules, namely AC / DC1, AC / DC2, and AC / DC3. Among them, AC / DC1 supplies power to the device itself, and AC / DC2 and AC / DC3 respectively supply power to two groups of output interfaces. AC / DC2 and AC / DC3 are adjustable power supplies, which can meet the adjustable output range of 27V to 32V.

[0139] Figure 1 As shown in, the point self-check signal and power supply voltage signal conditioning module is composed of an operational amplifier OPA188AID and a differential amplifier AD628. The point self-check signal and voltage signal pass through a clamping circuit composed of resistors and voltage regulators, and then pass through an amplification circuit composed of a variable gain amplifier AD628AR. When the voltage difference between the non-inverting input terminal and the inverting input terminal of the variable gain amplifier AD628AR becomes larger, the voltages at both ends will tend to be equal. When the voltage of the inverting input terminal becomes higher, the output will change negatively, and then it is inverted by a high-precision operational amplifier OPA188AID and input into the acquisition module.

[0140] Figure 2As shown, the positive and negative terminals of the continuous liquid level transducer signal pass through an RC filter circuit composed of precision capacitors and resistors, and then pass through an amplification circuit composed of a variable gain amplifier AD8421AR. When the voltage difference between the non-inverting input terminal and the inverting input terminal of the variable gain amplifier AD8421AR becomes larger, the voltages at both ends will tend to be equal. When the voltage at the inverting input terminal becomes higher, the output will change negatively, and then it is inverted by a high-precision operational amplifier OPA188AID and input into the signal acquisition module.

[0141] The signal acquisition module of the filling liquid level monitoring unit is used to acquire signals. The acquired signals include passive switch signals and analog voltage signals. The point-type passive signal acquisition circuit, such as Figure 4 shown, is excited by a 12V signal, isolated by an opto-isolator, and then input to the IO acquisition; the analog voltage signal is divided into point-type intermediate voltage signal acquisition and continuous triangular wave and linear wave voltage acquisition.

[0142] Among them, the point-type intermediate voltage signal acquisition circuit uses a 16-bit 8-channel synchronous sampling chip and a COMS switch to form a switching matrix and performs acquisition step by step, as Figure 5 shown; the continuous triangular wave and linear wave acquisition circuit, as Figure 6 shown, uses a precision 24-bit analog-to-digital converter with 20-bit effective resolution, which can ensure that the sampling accuracy reaches 0.001V. The 16-bit 8-channel synchronous sampling chip included in the point-type intermediate voltage signal acquisition circuit is AD7606, and the COMS switch is DG408DY+. The precision 24-bit analog-to-digital converter in the continuous triangular wave and linear wave acquisition circuit is ADS1220IPWR.

[0143] The core of the filling liquid level monitoring unit is the DSP processing module. The digital signal processor selects TMS320F28335 with a main frequency of 150M and has a 16-channel 12-bit analog-to-digital conversion module. The DSP processing module circuit, as Figure 7 shown. The power supply voltages on the DSP processing module are 5V, 3.3V, and 1.9V, and a dedicated chip TPS767D301PWP is used to supply power to the DSP control module circuit. The main functions of the DSP processing module include signal acquisition, IO control, network communication, serial communication, CAN communication, data calculation, etc.

[0144] The filling liquid level monitoring unit also includes a network communication module, which is used for the transmission communication function with the upper computer software, such as Figure 8As shown in the figure, it includes Network Communication Circuit 1 and Network Communication Circuit 2. Network Communication Circuit 1 is the main network port, and Network Communication Circuit 2 is the slave network port. When the main network port fails, it can be directly switched to the slave network port. The network communication circuit uses the W5300 module, which supports TCP and UDP protocols; it adopts a full-duplex working mode and can automatically correct the signal polarity; there is a 16KB memory inside for data sending / receiving buffering, which can meet the transmission rate adaptation, and the transmission rate can reach 100Mbps.

[0145] The filling liquid level monitoring unit includes a serial communication module for serial communication functions with external devices, such as Figure 9 As shown in the figure; the serial communication module includes the serial communication chip MAX490E and the digital isolation chip ADuM1201ARZ. The signal output by the DSP is converted by the serial communication chip and then output through the digital isolation chip to ensure that the signals do not interfere with each other.

[0146] Such as Figure 10 As shown in the figure, the human-machine interaction panel includes five power supply control switches, an output adjustable knob, 7 digital display meters, dot signal indicators and analog switches, a remote control switching knob, an interface connected to the converter, a network communication interface, a serial communication interface, etc.

[0147] The present invention can complete the function of monitoring the filling liquid level height of the first and second stages of the rocket, realize the simultaneous power supply and data acquisition for different types and multiple capacitive cryogenic liquid level sensors, improve the data monitoring efficiency, and have high measurement accuracy.

[0148] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A liquid level testing device suitable for filling a shooting range, characterized in that: include: Human-machine interaction panel and filling level detection unit; The filling level detection unit includes: a signal conditioning module, a signal acquisition module, a DSP processing module, a network communication module and a serial communication module; The signal conditioning module is used to condition and filter the voltage signal to be collected, and transmit the conditioned and filtered voltage signal to the signal collection module; The signal acquisition module is used to acquire the voltage signal and transmit the acquired voltage signal to the DSP processing module; The DSP processing module is used to process the voltage signal and transmit the processed voltage signal to the network communication module and the serial communication module; The network communication module is used to realize the transmission communication function with the host computer; the serial port communication module is used to realize the serial port communication function with the external device; The network communication module and the serial communication module are connected to the human-computer interaction panel; The signal acquisition module includes: a passive switch signal acquisition circuit and an analog voltage signal acquisition circuit; The passive switch signal acquisition circuit is used to acquire passive switch signals, and the analog voltage signal acquisition circuit is used to acquire analog voltage signals; The analog voltage signal acquisition circuit includes: a point-type intermediate voltage signal acquisition circuit, and a continuous triangle wave and linear wave acquisition circuit; The signals collected by the signal collection module include: passive switch signals and analog voltage signals; The signal conditioning module includes: a point-type intermediate voltage signal conditioning module circuit, and a continuous triangle wave and linear wave signal conditioning circuit; The output end of the point-type intermediate voltage signal conditioning module circuit is connected to the input end of the point-type intermediate voltage signal acquisition circuit; The output end of the continuous triangular wave and linear wave signal conditioning circuit is connected to the input end of the continuous triangular wave and linear wave acquisition circuit; The point-type intermediate voltage signal conditioning module circuit includes: an operational amplifier, a resistor R199, a capacitor C356, a resistor R192, a resistor R195, a capacitor C351, a resistor R197, a resistor R198, a chip U75, a diode D67, a capacitor C559, a capacitor C562, a capacitor C563, a resistor R422 and a resistor R423; The VI_IN signal is outputted through one end of the resistor R423, and the other end of the resistor R423 is respectively connected to one end of the capacitor C562, one end of the capacitor C563, the cathode of the diode D67 and the +IN connection end of the chip U75; the anode of the diode D67 is grounded; the other end of the capacitor C563 is grounded; One end of the resistor R422 is grounded, and the other end of the resistor R422 is respectively connected to one end of the capacitor C559, the other end of the capacitor C562 and the -IN connection end of the chip U75; The FILT connection end of the chip U75 is connected to one end of the capacitor C351, and the other end of the capacitor C351 is grounded; the OUT connection end of the chip U75 is respectively connected to one end of the resistor R197 and one end of the resistor R195, and the other end of the resistor R197 is respectively connected to the RG connection end of the chip U75 and one end of the resistor R198, and the other end of the resistor R198 is grounded; The other end of the resistor R195 is respectively connected to one end of the resistor R192 and the non-inverting input end of the operational amplifier, and the inverting input end of the operational amplifier is respectively connected to one end of the resistor R199 and one end of the capacitor C356; the other end of the resistor R199 is respectively connected to the other end of the capacitor C356 and the output end of the operational amplifier, and the output end of the operational amplifier outputs the VI signal.

2. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: The liquid level testing device also includes: a power supply module; The power supply module is used to supply power to the signal conditioning module, the signal acquisition module, the DSP processing module, the network communication module and the serial communication module.

3. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: A differential operational amplifier circuit is provided between the signal conditioning module and the signal acquisition module; The voltage signal output by the signal conditioning module is differentially processed by the differential operational amplifier circuit and then input to the signal acquisition module.

4. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: The DSP processing module includes: a digital signal processor and a processor peripheral circuit; The digital signal processor and the peripheral circuits of the processor are used to realize the following functions: digital signal processing, power-on and power-off control, indicator light control, data collection packaging, remote control / local control switching; The model of the digital signal processor is TMS320F28335.

5. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: The network communication module includes: network communication circuit 1 and network communication circuit 2; The network communication circuit 1 is a master network port, and the network communication circuit 2 is a slave network port. When the master network port fails, it can be directly switched to the slave network port.

6. The liquid level testing device suitable for filling a shooting range according to claim 2, characterized in that: The power supply module includes: three independent AC / DC power supply modules; The three AC / DC power modules respectively supply power to the device itself and two groups of output interfaces. The output voltages of the two AC / DC power modules supplying power to the two groups of output interfaces can be adjusted, and the adjustment range of the output voltage is 27V~32V.

7. The liquid level testing device suitable for filling a shooting range according to claim 3, characterized in that: The differential operational amplifier circuit comprises: an operational amplifier, a gain amplifier, a capacitor and a resistor; The model of the operational amplifier is OPA188AID, and the model of the gain amplifier is AD628AR.

8. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: The point-type intermediate voltage signal acquisition circuit adopts 12V signal excitation, which is isolated by a photoelectric isolator and then input to the IO for acquisition; The point-type intermediate voltage signal acquisition circuit adopts a 16-bit 8-channel synchronous sampling chip and a COMS switch to form a switching matrix, and performs acquisition in steps; The continuous triangular wave and linear wave acquisition circuit adopts a precision 24-bit analog-to-digital converter with 20-bit effective resolution and a sampling accuracy of 0.001V; The model of the 16-bit 8-channel synchronous sampling chip is AD7606, the model of the COMS switch is DG408DY+, and the model of the precision 24-bit analog-to-digital converter is ADS1220IPWR.

9. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: The network communication module adopts W5300 module, which supports TCP protocol and UDP protocol; The network communication module adopts full-duplex working mode and can automatically correct the signal polarity; The network communication module has a 16KB memory inside for data sending / receiving buffer, which can meet the transmission rate adaptation, and the transmission rate can reach 100Mbps; The serial communication module includes: a serial communication chip and a digital isolation chip; The signal output by the DSP processing module is converted by the serial communication chip and then output by the digital isolation chip; The model of the serial communication chip is MAX490E, and the model of the digital isolation chip is ADuM1201ARZ.

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