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Manufacturing method of liquefied natural gas power vehicle pressure monitoring and enhancement system

发布日期:2020-01-18 03:51 Document serial number: 19730122 Release date: 2020-01-18 03:51
Manufacturing method of liquefied natural gas power vehicle pressure monitoring and enhancement system

The invention relates to the technical field of low-pressure engineering, in particular to a pressure monitoring and enhancing system for a liquefied natural gas powered vehicle.



Background technique:

Domestic lng filling stations for automobiles can only provide low-saturation lng liquid (-162 ° C, 0.1mpa), which causes the cylinder pressure to be too low and affects vehicle operation. In order to meet the needs of vehicle engines, self-boosting systems have been added to vehicle bottles. In the prior art, an air-temperature supercharging system and a water bath supercharging system are generally used, but the two supercharging systems have a long supercharging time and low efficiency.

According to the patent number: cn201720128145-lng vehicle gas cylinder booster device, hereinafter collectively referred to as the reference patent, the reference patent added a turbocharger to achieve mechanical supercharging, but due to the lack of effective detection and control components in the process of pressurization, As a result, the pressure of the pressurized natural gas is unstable, which affects the subsequent use of natural gas.



Technical realization elements:

In order to overcome the above-mentioned shortcomings, the present invention provides a pressure monitoring and enhancing system for an LNG-powered vehicle.

The present invention achieves the foregoing objectives through the following technical solutions:

The LNG-powered vehicle pressure monitoring and enhancement system includes a gas cylinder, a water bath-type supercharging device, a buffer tank, and a control device. The gas cylinder, a water bath-type supercharging device, and a buffer tank are in cyclic communication in sequence. The control device is connected to the buffer tank; The buffer tank is provided with a supercharger, and the water bath supercharging device communicates with the gas cylinder through the supercharger;

The control device includes a temperature sensor, a pressure transmitter and a controller. The temperature sensor is located at the connection between the water bath booster and the gas cylinder. The pressure transmitter is located at the connection between the supercharger and the gas cylinder. There is a signal transmission module between the sensors, and a signal amplification module is provided between the controller and the pressure transmitter. The signal transmission module is used to receive the temperature signal detected by the temperature sensor and transmit it to the controller. The signal amplification module It is used to receive and amplify the pressure signal detected by the pressure transmitter and transmit it to the controller. There is a drive module between the controller and the booster pump. The drive module is used to receive the booster pump sent by the controller. Control signal and drive booster pump to work.

In this LNG-powered vehicle pressure monitoring and enhancement system, the natural gas in the cylinder passes the water-bath booster, and then re-pressurizes through the booster in the buffer tank. At the same time, the controller in the control device controls the water-bath booster. The temperature at the connection between the pressure device and the gas cylinder and the pressure at the connection between the supercharger and the gas cylinder are monitored in real time, and the booster pump is controlled based on the detected data to achieve reliable and stable boosting of the liquefied natural gas. .

Preferably, the water bath type pressure increasing device includes a bidirectional pipe joint, a stop valve, a pressure regulating valve, a threaded joint, a loop nut, a finned pipe joint and a finned pipe group. The bidirectional pipe joint is arranged on a gas cylinder, and the bidirectional pipe The joint communicates with the threaded joint through a shut-off valve and a pressure regulating valve. The threaded joint communicates with the finned pipe joint through a loose nut. The finned pipe group includes several finned tubes that communicate in sequence from end to end. The finned pipe joint is connected with the finned pipe group. The booster in the buffer tank is connected; after the natural gas passes through the two-way pipe joint, the shut-off valve and the pressure regulating valve, the pipe is connected to the finned pipe group by the threaded joint, the loose nut, and the finned pipe joint. Group to pressurize, and then enter the buffer tank for secondary pressurization.

Preferably, a filter screen is provided at one end of the bidirectional pipe joint in the gas cylinder, a first flow valve is provided between the shut-off valve and the pressure regulating valve, and a connection between the finned tube and the booster of the buffer tank is provided. Second overflow valve.

Preferably, the signal transmission module includes a signal transmission circuit, and the signal transmission circuit includes an integrated circuit, a first resistor, a second resistor, a third resistor, an adjustable resistor, and an integrated sensor. The type of the integrated circuit is ad693, and the integrated sensor The model number is ad592. The fourteenth terminal of the integrated circuit is grounded through a series circuit composed of a first resistor and an integrated sensor, and the fourteenth terminal of the integrated circuit is grounded through a series circuit composed of a second resistor, an adjustable resistor, and a third resistor. One end of the temperature sensor is connected to the seventeenth end of the integrated circuit, the other end of the temperature sensor is connected to the adjustable end of the adjustable resistor, and the eighteenth end of the integrated circuit is connected to the first resistor and the integrated sensor, respectively. Two terminals are grounded, the sixth terminal of the integrated circuit is grounded, the thirteenth terminal of the integrated circuit is connected to the twelfth terminal of the integrated circuit, the ninth terminal of the integrated circuit is connected to the eighth terminal of the integrated circuit, and the seventh terminal of the integrated circuit Ground. The tenth terminal of the integrated circuit is connected to the signal input terminal of the controller.

Preferably, the temperature sensor is a thermocouple, and the material used for the temperature sensor is a copper-nickel alloy. The resistance value of the first resistor is 51.7 ohms, and the resistance value of the third resistor is 310 ohms.

The signal transmission circuit is a thermocouple temperature measurement circuit with cold junction temperature compensation composed of ad693 and ad592. The circuit has the following characteristics: first, it adapts to various types of thermocouples; second, it uses an ad592 current output type integration The temperature sensor performs cold-junction temperature compensation. The current temperature coefficient of the ad592 is 1 μa / k. Third, the thermodynamic temperature (k) can be converted to Celsius (° C), and then converted into a standard current signal for long-distance transmission: fourth , Can flexibly set the temperature measurement range. The resistance of the first and third resistors depends on the type of the thermocouple and the ambient temperature. When a j-type thermocouple is used, the resistance of the first resistor is 51.7 ohms, and the resistance of the third resistor is 310 ohms. At ℃, the thermocouple needs to be placed in the ice-water mixture, and then the adjustable resistance is adjusted so that io = 4ma. Other temperature values can be calibrated with a standard millivolt meter.

Preferably, a ferrule joint is provided between the buffer tank and the gas cylinder, and the ferrule joint is disposed on the gas cylinder.

The beneficial effect of the present invention is: compared with the prior art, the present invention uses a controller in the control device to perform real-time temperature control at the connection between the water bath pressure booster and the gas cylinder and pressure at the connection between the supercharger and the gas cylinder. Monitoring, and then controlling the booster pump based on the detected data to achieve reliable and stable boosting of liquefied natural gas; moreover, the signal transmission circuit is composed of ad693 and ad592 thermocouple temperature measurement circuit with cold junction temperature compensation, The high accuracy of the temperature measurement further improves the reliability of the booster system.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described by way of example and with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a circuit schematic diagram of a signal transmission circuit of the present invention.

In the picture: 1. filter screen, 2. two-way pipe joint, 3. stop valve, 4. first overflow valve, 5. pressure regulating valve, 6. threaded joint, 7. loop nut, 8. finned pipe joint , 9. Finned tube group, 10. Second overflow valve, 11. Buffer tank, 12. Control device, 13. Ferrule joint, 14. Cylinder, r1. First resistance, r2. Second resistance, r3 Third resistor, rp1. Adjustable resistor, u1. Integrated circuit, u2. Integrated sensor.

detailed description

The present invention will now be described in further detail with reference to the drawings. These drawings are simplified schematic diagrams, which illustrate the basic structure of the present invention only in a schematic manner, so they only show the constitutions related to the present invention.

As shown in Figures 1 and 2, the LNG-powered vehicle pressure monitoring and enhancement system includes a gas cylinder 14, a water bath booster, a buffer tank 11, and a control device 12, a gas cylinder 14, a water bath booster, and a buffer tank 11 The three are communicated in turn, and the control device 12 is connected to the buffer tank 11; a booster is provided in the buffer tank 11, and the water bath pressure booster is connected to the gas cylinder 14 through the booster;

The control device 12 includes a temperature sensor, a pressure transmitter, and a controller. The temperature sensor is located at the connection between the water bath pressure booster and the gas cylinder 14, and the pressure transmitter is located at the connection between the supercharger and the gas cylinder 14. A signal transmission module is provided between the temperature sensor and the temperature sensor, and a signal amplification module is provided between the controller and the pressure transmitter. The signal transmission module is used to receive the temperature signal detected by the temperature sensor and transmit it to the controller. The signal amplifying module is used for receiving and amplifying the pressure signal detected by the pressure transmitter, and transmitting the signal to the controller. A driving module is provided between the controller and the booster pump. The driving module is used for receiving the signal sent by the controller. Booster pump control signal and drive the booster pump to work.

In the LNG-powered vehicle pressure monitoring and enhancement system, the natural gas in the gas cylinder 14 passes through the water-bath booster and then is re-pressurized by the booster in the buffer tank 11. At the same time, the controller in the control device 12 The temperature at the connection between the water bath booster and the gas cylinder 14 and the pressure at the connection between the supercharger and the gas cylinder 14 are monitored in real time, and the booster pump is controlled based on the detected data to realize the liquefied natural gas Reliable and stable boost.

In this embodiment, the water-bath booster device includes a bidirectional pipe joint 2, a shut-off valve 3, a pressure regulating valve 5, a threaded joint 6, a loose nut 7, a finned pipe joint 8, a finned pipe group 9, and a bidirectional pipe. The joint 2 is provided on the gas cylinder 14. The bidirectional pipe joint 2 communicates with the threaded joint 6 through the stop valve 3 and the pressure regulating valve 5. The threaded joint 6 communicates with the finned pipe joint 8 through the loose nut 7. The finned pipe group 9 includes Several finned tubes are connected in sequence from end to end. The finned tube joint 8 communicates with the supercharger in the buffer tank 11 through the finned tube group 9; the natural gas passes through the bidirectional pipe joint 2, the stop valve 3, and the pressure regulating valve 5, and is threaded. The joint 6, the loop nut 7, and the finned pipe joint 8 realize the communication between the pipeline and the finned pipe group 9, and the finned pipe group 9 is used for pressurization, and then enters the buffer tank 11 for secondary pressurization.

In this embodiment, a filter screen 1 is provided at one end of the bidirectional pipe joint 2 in the gas cylinder 14, a first overcurrent valve 4 is provided between the shut-off valve 3 and the pressure regulating valve 5, and the finned tube and the buffer tank 11 are provided. A second overcurrent valve 10 is provided at the connection of the supercharger.

In this embodiment, the signal transmission module includes a signal transmission circuit, and the signal transmission circuit includes an integrated circuit u1, a first resistor r1, a second resistor r2, a third resistor r3, an adjustable resistor rp1, and an integrated sensor u2. The model of circuit u1 is ad693, the model of integrated sensor u2 is ad592, the fourteenth terminal of integrated circuit u1 is grounded through a series circuit composed of a first resistor r1 and integrated sensor u2, and the fourteenth terminal of integrated circuit u1 is connected through a second resistor The series circuit composed of r2, adjustable resistance rp1 and third resistance r3 is grounded. One end of the temperature sensor is connected to the seventeenth end of integrated circuit u1, and the other end of the temperature sensor is connected to the adjustable end of adjustable resistance rp1. The integrated circuit The eighteenth terminal of u1 is connected to the first resistor r1 and the integrated sensor u2, the second terminal of the integrated circuit u1 is grounded, the sixth terminal of the integrated circuit u1 is grounded, and the thirteenth terminal of the integrated circuit u1 is connected to the first terminal of the integrated circuit u1. Twelve terminals are connected, the ninth terminal of the integrated circuit u1 is connected to the eighth terminal of the integrated circuit u1, the seventh terminal of the integrated circuit u1 is grounded, and the tenth terminal of the integrated circuit u1 is connected to the signal input terminal of the controller .

In this embodiment, the temperature sensor is a thermocouple, and the material used for the temperature sensor is a copper-nickel alloy. The resistance of the first resistor r1 is 51.7 ohms, and the resistance of the third resistor r3 is 310 ohms.

The signal transmission circuit is a thermocouple temperature measurement circuit with cold junction temperature compensation composed of ad693 and ad592. The circuit has the following characteristics: first, it adapts to various types of thermocouples; second, it uses an ad592 current output type integration The temperature sensor performs cold-junction temperature compensation. The current temperature coefficient of the ad592 is 1 μa / k. Third, the thermodynamic temperature (k) can be converted to Celsius (° C), and then converted into a standard current signal for long-distance transmission: fourth , Can flexibly set the temperature measurement range. The resistance of the first resistor r1 and the third resistor r3 should depend on the type of the thermocouple and the ambient temperature. When a j-type thermocouple is used, the resistance of the first resistor r1 is 51.7 ohms, and the resistance of the third resistor r3 is 310. Ohm, the thermocouple needs to be placed in the ice-water mixture when calibrating at 0 ℃, and then the adjustable resistance rp1 is adjusted so that io = 4ma. Other temperature values can be calibrated with a standard millivolt meter.

In this embodiment, a ferrule joint 13 is provided between the buffer tank 11 and the gas cylinder 14, and the ferrule joint 13 is disposed on the gas cylinder 14.

The foregoing is based on the present invention as a revelation. Through the above description, the relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of this invention is not limited to the content of the description, and its technical scope must be determined according to the scope of the claims.

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