Gas storage tank exhaust control system and exhaust control method

Abstract

The present invention relates to an exhaust control system and an exhaust control method for a gas storage tank, comprising: at least two gas storage tanks: each gas storage tank is provided with two gas ports; a passive exhaust device, comprising a venturi tube, the venturi tube having an exhaust channel and an air intake channel, the exhaust channel comprising: an inlet section, a contraction section and an expansion section, the air intake channel is connected to the contraction section through a pipeline, the first air port of the first gas storage tank is connected to the air intake channel through a pipeline, and the first air port of the second gas storage tank is connected to the inlet section of the exhaust channel through a pipeline; an active exhaust device, one end of which is connected to the first gas storage tank and the second gas storage tank through a pipeline respectively, and the other end is connected to the inlet section of the exhaust channel through a pipeline, and the active exhaust device can extract the gas in the first gas storage tank and the second gas storage tank and discharge it from the passive exhaust device under pressure. The present invention can discharge all the gas in the gas storage tank, thereby improving the exhaust efficiency and volume utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of gas tank exhaust, and in particular to a gas tank exhaust control system and an exhaust control method. Background Art

[0002] In the field of automotive fuel use, LNG or natural gas is stored in gas tanks. Generally, about 700 bar of high-pressure gas is stored in the gas tank, and the working pressure of the gas outside the gas tank is about 260 bar. These gases will be released into the engine for combustion to generate energy. After the release, the pressure inside the LNG or natural gas tank decreases. When the gas pressure in the LNG or natural gas tank drops to 260 bar or below, due to the high working pressure of the gas outside the gas tank, this part of the gas in the gas tank will not be able to be output to the outside of the gas tank for use by the engine, resulting in low utilization of the gas energy in the gas tank and the storage space of the gas tank cannot be effectively utilized.

[0003] In the prior art, the gas in the LNG or hydrogen gas storage tank cannot be completely discharged, which affects the utilization rate of the gas and the drying tank. In order to discharge all the gas in the gas storage tank, it is necessary to use an air pump to actively pressurize and discharge all the remaining gas. When multiple gas storage tanks are set, it is necessary to pressurize and discharge all the remaining gas in each tank. Then, when the gas is actively pressurized by the air pump to discharge the gas, the air pump needs to use more energy to work continuously, which causes greater energy consumption. Summary of the invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the problem in the prior art that when the gas pressure in the gas tank is lower than the working pressure of the gas outside the gas tank, the gas tank cannot be exhausted to the outside, resulting in gas residue and inability to be utilized. An exhaust control system and an exhaust control method for a gas tank are provided, which can exhaust all the gas in the gas tank and improve the exhaust efficiency and volume utilization rate.

[0005] In order to solve the above technical problems, the present invention provides a gas storage tank exhaust control system, comprising:

[0006] At least two gas storage tanks: a first gas storage tank and a second gas storage tank, wherein the first gas storage tank and the second gas storage tank are both provided with two gas ports: a first gas port and a second gas port;

[0007] A passive exhaust device, comprising a venturi tube, the venturi tube having an exhaust channel and an air intake channel, the exhaust channel comprising: an inlet section, a contraction section and an expansion section, the air intake channel is connected to the contraction section through a pipeline, the first air port of the first air storage tank is connected to the air intake channel through a pipeline, and the first air port of the second air storage tank is connected to the inlet section of the exhaust channel through a pipeline;

[0008] An active exhaust device, one end of which is connected to the second air ports of the first air tank and the second air tank through pipelines, and the other end of which is connected to the inlet section of the exhaust channel through a pipeline. The active exhaust device can extract the gas in the first air tank and the second air tank and discharge it from the passive exhaust device under pressure. Through the active exhaust device, the gas in the second air tank is first pressurized and discharged from the exhaust channel of the Venturi tube. At this time, the residual gas in the first air tank is adsorbed and discharged from the intake channel of the Venturi tube.

[0009] In one embodiment of the present invention, n gas storage tanks are included, wherein:

[0010] The first air port of the first air storage tank is connected to the air intake passage only through a pipeline;

[0011] The first gas ports of the 2nd to n-1th gas storage tanks are not only connected to the inlet section of the exhaust passage through a pipeline, but also connected to the intake passage through a pipeline;

[0012] The first gas port of the nth gas storage tank is connected only to the inlet section of the exhaust passage through a pipeline;

[0013] The second gas ports of all gas storage tanks are connected to the active exhaust device through pipelines.

[0014] In one embodiment of the present invention, the number of the gas storage tanks is 3 to 5.

[0015] In one embodiment of the present invention, the passive exhaust device further comprises:

[0016] a housing, wherein the venturi tube is disposed in the housing;

[0017] A first one-way intake valve assembly is disposed in the housing, the first one-way intake valve assembly is connected to the inlet section of the exhaust passage through a pipeline, and the first one-way intake valve assembly controls gas to enter only from the inlet section;

[0018] A second one-way air intake valve assembly is arranged in the housing. The second one-way air intake valve assembly is connected to the inlet section of the air intake passage through a pipeline. The second one-way air intake valve assembly controls gas to enter only from the air intake passage.

[0019] In one embodiment of the present invention, the first one-way air intake valve assembly and the second one-way air intake valve assembly both include:

[0020] A valve plug and an elastic member, wherein the elastic member elastically supports the valve plug to block the air inlet;

[0021] When the gas flows from the valve plug toward the elastic member, the gas pushes the valve plug to compress the elastic member, the valve plug is separated from the air inlet, the air inlet is opened, and the gas passes through;

[0022] When the gas flows from the elastic member toward the valve plug, the gas pushes the valve plug to block the air inlet.

[0023] In one embodiment of the present invention, a switch check valve is provided on the pipeline between the first gas port of the gas storage tank and the passive exhaust device.

[0024] In one embodiment of the present invention, an electromagnetic switch valve is provided on the pipeline between the second gas port of the gas storage tank and the active exhaust device.

[0025] In one embodiment of the present invention, a first one-way valve is provided on a pipeline between the active exhaust device and the inlet section of the exhaust passage.

[0026] In one embodiment of the present invention, a pressure accumulator is further included, and the pressure accumulator is connected to the expansion section of the exhaust passage through a pipeline, and the gas in the gas storage tank is discharged into the pressure accumulator.

[0027] In one embodiment of the present invention, the pressure accumulator is provided with a pressure discharge port, the pressure discharge port is connected to the gas storage tank through a pipeline, and a second one-way valve is provided on the pipeline between the pressure discharge port and the gas storage tank.

[0028] In one embodiment of the present invention, it further comprises: a plurality of pressure sensors, wherein the plurality of pressure sensors are respectively used to detect the gas pressure in the plurality of gas storage tanks and the pressure accumulator.

[0029] In one embodiment of the present invention, the gas storage tank stores liquefied natural gas or hydrogen.

[0030] In order to solve the above technical problems, the present invention also provides a gas tank exhaust control method, which uses the above gas tank exhaust control system and includes the following steps:

[0031] S1. Determine the number of gas storage tanks, open the first gas storage tank, allow the gas in the first gas storage tank to enter from the air intake channel of the venturi tube, and discharge the gas in the first gas storage tank into the accumulator. When the gas pressure in the first gas storage tank is the same as the gas pressure in the accumulator, the exhaust process stops, and a certain amount of gas remains in the first gas storage tank;

[0032] S2, open the second gas tank, so that the gas in the second gas tank enters from the exhaust channel of the venturi tube, and discharges the gas in the second gas tank into the accumulator. When the gas in the second gas tank passes through the contraction section in the venturi tube, its flow rate increases and the pressure decreases. At this time, the residual gas in the first gas tank is adsorbed and discharged from the suction channel of the venturi tube into the accumulator;

[0033] S3, referring to step S2, opening subsequent gas storage tanks in sequence, allowing the gas in the subsequent gas storage tank to enter from the exhaust channel of the venturi tube, allowing the residual gas in the previous gas storage tank to be adsorbed and enter from the intake channel of the venturi tube, and the gas in the two gas storage tanks is discharged into the accumulator together;

[0034] S4, start the active exhaust device, first pressurize the gas in the last gas tank and let it enter from the exhaust channel of the venturi tube, at this time, the residual gas in the previous gas tank is adsorbed and enters from the intake channel of the venturi tube, and the gas in the two gas tanks is discharged into the accumulator together;

[0035] S5, referring to step S4, the gas in the previous gas tank is pressurized and enters from the exhaust channel of the venturi tube in sequence, until the gas in the first gas tank is pressurized and enters from the exhaust channel of the venturi tube, so that the gas in all gas tanks is completely discharged into the accumulator

[0036] In one embodiment of the present invention, it also includes: S6, setting a pressure threshold in the accumulator, detecting the actual pressure value of the gas in each gas storage tank and the accumulator in real time, and when the actual pressure value in the accumulator exceeds the pressure threshold, discharging the gas in the accumulator into 1-2 gas storage tanks with lower pressure that are being exhausted, and stopping exhausting the gas into the accumulator.

[0037] The above technical solution of the present invention has the following advantages compared with the prior art:

[0038] The gas tank exhaust control system and exhaust control method of the present invention utilize the air intake characteristics of the venturi tube to realize efficient exhaust control of multiple gas tanks, connect the multiple gas tanks to the exhaust channel and the air intake channel of the venturi tube respectively, first discharge the gas in the previous gas tank normally through the venturi tube, when the gas pressure in the gas tank is equal to or lower than the use pressure, a certain amount of gas remains in the gas tank, at this time, the gas in the next gas tank is opened to enter through the exhaust channel of the venturi tube, when the gas in the next gas tank passes through the contraction section in the venturi tube, its flow rate increases and the pressure decreases, at this time, the residual gas in the previous gas tank is adsorbed and discharged from the air intake channel of the venturi tube to achieve the effect of secondary exhaust; at this time, the purpose of passive exhaust can be achieved without energy consumption;

[0039] After all the gases in multiple gas tanks are set to enter from the exhaust channel of the venturi tube, only the last gas tank has the most gas, and the gases in the remaining gas tanks will be partially or completely adsorbed and discharged. Finally, through the active exhaust device, the gas in the last gas tank is pressurized and discharged from the exhaust channel of the venturi tube. At this time, the residual gas in the previous gas tank is adsorbed and discharged from the intake channel of the venturi tube, realizing the adsorption effect of the secondary venturi tube and achieving the effect of tertiary discharge. Then, the gas in all the gas tanks is pressurized and discharged from the exhaust channel of the venturi tube in turn, achieving the effect of quadruple discharge, thereby improving the exhaust rate and being able to discharge all the gases in multiple gas tanks.

[0040] Compared with the prior art that uses active exhaust devices to discharge all the gas in all gas tanks, only the remaining gas in the last gas tank needs to be actively pressurized and discharged, and the gas in other gas tanks will be partially or completely discharged passively, without consuming energy. Under the premise of satisfying the requirement of exhausting all the gas, energy consumption is reduced. Moreover, when the pressure in the accumulator in front of the engine is too high, the excess pressure can be avoided from being discharged into the atmosphere to pollute the environment, and can be directly discharged into the gas tank for easy recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0042] Figure 1 It is a structural schematic diagram of an embodiment of the gas storage tank exhaust control system of the present invention;

[0043] Figure 2 is a schematic diagram of the internal structure of the passive exhaust device of the present invention;

[0044] Figure 3 It is a flow chart of the steps of the gas storage tank exhaust control method of the present invention.

[0045] Explanation of the markings in the specification: 1. No. 1 gas tank; 2. No. 2 gas tank; 3. No. 3 gas tank; 4. Passive exhaust device; 41. Venturi tube; 42. Shell; 43. First one-way intake valve assembly; 44. Second one-way intake valve assembly; 401. Valve plug; 402. Elastic member; 5. Active exhaust device; 6. Accumulator; 7. First switch check cut-off valve; 8. Second switch check cut-off valve; 9. Third switch check cut-off valve; 10. Fourth switch check cut-off valve; 11. Fifth switch check cut-off valve; 12. First solenoid switch valve; 13. Second solenoid switch valve; 14. Third solenoid switch valve; 15. First one-way valve; 16. Second one-way valve; 17. First pressure sensor; 18. Second pressure sensor; 19. Third pressure sensor; 20. Fourth pressure sensor. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Example 1

[0047] The present invention discloses an air tank exhaust control system, comprising: a plurality of air tanks, a passive exhaust device and an active exhaust device, specifically, at least comprising: two air tanks, namely a first air tank and a second air tank, wherein the first air tank and the second air tank are both provided with two air ports, namely: a first air port and a second air port;

[0048] The passive exhaust device comprises a venturi tube, the venturi tube has an exhaust channel and an air intake channel, the exhaust channel comprises: an inlet section, a contraction section and an expansion section, the air intake channel is connected with the contraction section through a pipeline, the function of the venturi tube is: when a fluid (liquid or gas) passes through a narrowed channel, the flow rate will increase, and the pressure will decrease, and this pressure decrease can generate suction at the suction end, so as to inhale or mix other fluids, and by utilizing this characteristic, the first air port of the first air storage tank is connected with the air intake channel through a pipeline, and the first air port of the second air storage tank is connected with the inlet section of the exhaust channel through a pipeline;

[0049] The active exhaust device has one end connected to the first gas tank and the second gas tank through pipelines, and the other end connected to the inlet section of the exhaust channel through a pipeline. The active exhaust device can extract the gas in the first gas tank and the second gas tank and discharge it under pressure from the passive exhaust device.

[0050] Specifically, when multiple gas storage tanks are provided, the above principle is also followed. Two adjacent gas storage tanks are the first gas storage tank and the second gas storage tank, that is, when three gas storage tanks are provided, the second gas storage tank is the second gas storage tank of the first gas storage tank, and the second gas storage tank is the first gas storage tank of the third gas storage tank, and so on. It is not explained one by one. When n gas storage tanks are provided, among which:

[0051] The first air port of the first air storage tank is connected to the air intake passage only through a pipeline;

[0052] The first gas ports of the 2nd to n-1th gas storage tanks are not only connected to the inlet section of the exhaust passage through a pipeline, but also connected to the intake passage through a pipeline;

[0053] The first gas port of the nth gas storage tank is connected only to the inlet section of the exhaust passage through a pipeline;

[0054] The second gas ports of all gas storage tanks are connected to the active exhaust device through pipelines.

[0055] The gas tank exhaust control system of the present invention utilizes the air intake characteristics of the venturi tube to realize efficient exhaust control of multiple gas tanks, and connects the multiple gas tanks to the exhaust channel and the air intake channel of the venturi tube respectively. First, the gas in the previous gas tank is normally discharged through the venturi tube. When the gas pressure in the gas tank is equal to or lower than the use pressure, a certain amount of gas remains in the gas tank. At this time, the gas in the next gas tank is opened to enter through the exhaust channel of the venturi tube. When the gas in the next gas tank passes through the contraction section in the venturi tube, its flow rate increases and the pressure decreases. At this time, the residual gas in the previous gas tank is adsorbed and discharged from the air intake channel of the venturi tube to achieve the effect of secondary exhaust. At this time, the purpose of passive exhaust can be achieved without energy consumption.

[0056] After all the gases in multiple gas tanks are set to enter from the exhaust channel of the venturi tube, only the last gas tank has the most gas, and the gases in the remaining gas tanks will be partially or completely adsorbed and discharged. Finally, through the active exhaust device, the gas in the last gas tank is pressurized and discharged from the exhaust channel of the venturi tube. At this time, the residual gas in the previous gas tank is adsorbed and discharged from the intake channel of the venturi tube, realizing the adsorption effect of the secondary venturi tube and achieving the effect of tertiary discharge. Then, the gas in all the gas tanks is pressurized and discharged from the exhaust channel of the venturi tube in turn, achieving the effect of quadruple discharge, thereby improving the exhaust rate and being able to discharge all the gases in multiple gas tanks.

[0057] Compared with the prior art in which all the gas in all gas tanks is discharged by active exhaust devices, only the remaining gas in the last gas tank needs to be actively pressurized and discharged, and the gas in other gas tanks will be partially or completely discharged passively, without consuming energy. On the premise of fully discharging the gas, energy consumption is reduced.

[0058] Reference Figure 1 As shown, the following takes an air storage tank exhaust control system composed of three air storage tanks as an example to further illustrate the air storage tank exhaust control system of the present invention.

[0059] As shown in the figure, in this embodiment, three gas storage tanks are provided, namely, gas storage tank No. 1 1, gas storage tank No. 2 2 and gas storage tank No. 3 3, wherein:

[0060] The first air port of the No. 1 air storage tank 1 is connected to the air inlet passage of the venturi tube 41 in the passive exhaust device 4 through a pipeline, and the second air port of the No. 1 air storage tank 1 is connected to the active exhaust device 5 through a pipeline;

[0061] The first air port of the No. 2 air storage tank 2 is connected to the air inlet channel and the exhaust channel of the venturi tube 41 in the passive exhaust device 4 through pipelines, and the second air port of the No. 2 air storage tank 2 is connected to the active exhaust device 5 through pipelines;

[0062] The first air port of the No. 3 air storage tank 3 is connected to the exhaust passage of the venturi tube 41 in the passive exhaust device 4 through a pipeline, and the second air port of the No. 3 air storage tank 3 is connected to the active exhaust device 5;

[0063] The active exhaust device 5 is connected to the exhaust passage of the venturi tube 41 in the passive exhaust device 4 through a pipeline.

[0064] The purpose of adopting the above-mentioned gas tank exhaust control system is to discharge the gas in the No. 1 gas tank 1, the No. 2 gas tank 2 and the No. 3 gas tank 3 into the accumulator 6 for use by the engine. Therefore, the accumulator 6 is connected to the expansion section of the exhaust channel through a pipeline so that the gas in the gas tank is discharged into the accumulator 6. The specific exhaust process is:

[0065] First, open the No. 1 gas tank 1, let the gas in the No. 1 gas tank 1 enter from the suction channel of the venturi tube 41, and discharge the gas in the No. 1 gas tank 1 into the accumulator 6. When the gas pressure in the No. 1 gas tank 1 is the same as the gas pressure in the accumulator 6, the exhaust process stops, and a certain amount of gas remains in the No. 1 gas tank 1;

[0066] Open the No. 2 gas tank 2 again, so that the gas in the No. 2 gas tank 2 enters from the exhaust passage of the venturi tube 41, and discharges the gas in the No. 2 gas tank 2 into the accumulator 6. When the gas in the No. 2 gas tank 2 passes through the contraction section in the venturi tube 41, its flow rate increases and the pressure decreases. At this time, the Venturi effect is generated, so that the residual gas in the No. 1 gas tank 1 is adsorbed and discharged from the suction passage of the venturi tube 41 into the accumulator 6 again, so that the residual gas in the No. 1 gas tank 1 is less;

[0067] When the gas pressure in the No. 2 gas tank 2 is the same as the gas pressure in the accumulator 6, the exhaust process stops, and the No. 3 gas tank 3 is opened again, so that the gas in the No. 3 gas tank 3 enters from the exhaust passage of the venturi tube 41, and the gas in the No. 3 gas tank 3 is discharged into the accumulator 6. When the gas in the No. 3 gas tank 3 passes through the contraction section in the venturi tube 41, its flow rate increases and the pressure decreases. At this time, the Venturi effect is generated, so that the residual gas in the No. 1 gas tank 1 and the residual gas in the No. 2 gas tank 2 are adsorbed together and discharged from the suction passage of the venturi tube 41 into the accumulator 6 again, so that the residual gas in the No. 1 gas tank 1 and the No. 2 gas tank 2 is less;

[0068] Finally, when the gas pressure in gas tank No. 3 is the same as the gas pressure in accumulator 6, the exhaust process stops, and the active exhaust device 5 is turned on again. The gas in gas tank No. 3 first enters the exhaust channel of venturi tube 41 from the pressurized state. When the gas in gas tank No. 3 passes through the contraction section in venturi tube 41, its flow rate increases and the pressure decreases. At this time, a secondary Venturi effect is generated, so that the residual gas in gas tank No. 1 and the residual gas in gas tank No. 2 are adsorbed together and discharged from the intake channel of venturi tube 41 into accumulator 6 again, so that the residual gas in gas tank No. 1 and gas tank No. 2 is less. After all the gas in gas tank No. 3 is discharged, if there is still gas in gas tank No. 2, it is turned on again. Start the active exhaust device 5, and let the gas in gas tank No. 2 enter the exhaust channel of the venturi tube 41 from the pressurization. When the gas in gas tank No. 2 passes through the contraction section in the venturi tube 41, its flow rate increases and the pressure decreases. At this time, a secondary venturi effect is generated, so that the residual gas in gas tank No. 1 is adsorbed and discharged from the intake channel of the venturi tube 41 into the accumulator 6 again, so that the residual gas in gas tank No. 1 is less; after the gas in gas tank No. 2 is completely discharged, if there is still gas in gas tank No. 1, start the active exhaust device 5 again, and let the gas in gas tank No. 1 enter the exhaust channel of the venturi tube 41 from the pressurization, so that the gas in gas tank No. 1 is completely discharged into the accumulator 6.

[0069] Specifically, according to actual experimental verification, when three gas tanks are set, after the gas in gas tank No. 3 is discharged through the active exhaust device 5, the gas in gas tank No. 1 is basically completely passively discharged. Therefore, when the gas tank exhaust control system of the present invention is adopted, when three or more gas tanks are set, the exhaust efficiency is maximized. Theoretically, the more gas tanks are set, the higher the efficiency. However, according to actual usage requirements, and also according to application scenarios and floor space distribution, setting 3 to 5 gas tanks in a general vehicle engine is the best configuration, which can not only maximize efficiency but also meet the actual setting conditions.

[0070] In this embodiment, an air tank exhaust control system consisting of three air tanks is set up. In order to facilitate subsequent expansion, the first air port of the No. 3 air tank 3 is also connected to the air inlet channel of the Venturi tube 41 in the passive exhaust device 4 through a pipeline to facilitate the subsequent increase in the number of air tanks.

[0071] Specifically, in order to realize the communication control between different gas storage tanks and the venturi tube 41, a switch check valve is provided on the pipeline between the first gas port of the gas storage tank and the passive exhaust device 4;

[0072] Reference Figure 1As shown, in this embodiment, a first switch check valve 7 is provided on the pipeline between the first gas port of the No. 1 gas storage tank 1 and the air intake channel of the venturi tube 41, a second switch check valve 8 is provided on the pipeline between the first gas port of the No. 2 gas storage tank 2 and the air intake channel of the venturi tube 41, a third switch check valve 9 is provided on the pipeline between the first gas port of the No. 2 gas storage tank 2 and the exhaust channel of the venturi tube 41, a fourth switch check valve 10 is provided on the pipeline between the first gas port of the No. 3 gas storage tank 3 and the air intake channel of the venturi tube 41, and a fifth switch check valve 11 is provided on the pipeline between the first gas port of the No. 3 gas storage tank 3 and the exhaust channel of the venturi tube 41; in actual use, by controlling the on and off of the first switch check valve 7, the second switch check valve 8, the third switch check valve 9, the fourth switch check valve 10, and the fifth switch check valve 11, the connection mode between different gas storage tanks and the venturi tube 41 can be controlled.

[0073] Specifically, an electromagnetic switch valve is provided on the pipeline between the second gas port of the gas storage tank and the active exhaust device 5;

[0074] Reference Figure 1 As shown, in the present embodiment, a first electromagnetic switch valve 12 is arranged on the pipeline between the second gas port of the No. 1 gas storage tank 1 and the active exhaust device 5; a second electromagnetic switch valve 13 is arranged on the pipeline between the second gas port of the No. 2 gas storage tank 2 and the active exhaust device 5; a third electromagnetic switch valve 14 is arranged on the pipeline between the second gas port of the No. 3 gas storage tank 3 and the active exhaust device 5; in actual use, by controlling the switches of the first electromagnetic switch valve 12, the second electromagnetic switch valve 13 and the third electromagnetic switch valve 14, the connection mode between different gas storage tanks and the active exhaust device 5 can be controlled.

[0075] Specifically, refer to Figure 1 As shown, a first one-way valve 15 is provided on the pipeline between the active exhaust device 5 and the inlet section of the exhaust channel, so that the gas can only flow in one direction through the active exhaust device 5, that is, it is ensured that the gas can only be pressurized and discharged from the gas tank into the venturi tube 41 in the passive exhaust device 4, and finally discharged into the accumulator 6, to prevent the gas from flowing in the opposite direction.

[0076] Specifically, in the actual use of the gas storage tank exhaust control system of the present invention, the engine may not be used for a long time and the gas in the accumulator 6 may be full. When the gas in the accumulator 6 is full, the accumulator 6 will turn on the self-protection mode and discharge the excess gas outside the accumulator 6, which will cause environmental pollution and energy waste. In order to solve this problem, the present invention adopts two technical means:

[0077] First, the accumulator 6 is provided with a pressure discharge port, which is connected to the gas storage tank through a pipeline. When the gas in the accumulator 6 is full or reaches a set threshold, the gas in the accumulator 6 will be recovered into the gas storage tank to avoid environmental pollution and energy waste caused by discharge; and a second one-way valve 16 is provided on the pipeline between the pressure discharge port and the gas storage tank, and the second one-way valve 16 ensures that the gas can only flow from the accumulator 6 to the gas storage tank.

[0078] Second, multiple pressure sensors are provided, and the multiple pressure sensors are used to detect the gas pressure in the multiple gas storage tanks and the accumulator 6, respectively. Figure 1 As shown, corresponding to gas tank No. 1 1, gas tank No. 2 2 and gas tank No. 3 3, a first pressure sensor 17, a second pressure sensor 18 and a third pressure sensor 19 are respectively provided, and corresponding to the accumulator 6, a fourth pressure sensor 20 is provided, and the gas pressure in the accumulator 6 is detected by the fourth pressure sensor 20. When the gas pressure reaches a set threshold, exhausting the gas into the accumulator 6 is stopped; when the stop is not timely or other circumstances cause the pressure in the accumulator 6 to exceed the set threshold, the accumulator 6 exhausts the gas into the gas tank with the smallest pressure.

[0079] Specifically, according to actual usage requirements, liquefied natural gas, hydrogen or other combustible gases are stored in the gas storage tank.

[0080] Specifically, when the present invention uses the Venturi tube 41, it is necessary to ensure the unidirectional flow of the airflow, that is, when the airflow enters from the exhaust channel of the Venturi tube 41, it can only flow along the direction from the inlet section, the contraction section to the expansion section, and when the airflow enters from the suction channel of the Venturi tube 41, it can only be discharged from the expansion section;

[0081] In order to achieve the above-mentioned unidirectional flow, refer to Figure 2 As shown, the passive exhaust device 4 of the present invention also includes: a shell 42, a first one-way intake valve assembly 43 and a second one-way intake valve assembly 44, wherein: the venturi tube 41, the first one-way intake valve assembly 43 and the second one-way intake valve assembly 44 are all arranged in the shell 42, the first one-way intake valve assembly 43 is connected to the inlet section of the exhaust channel through a pipeline, and the first one-way intake valve assembly 43 controls the gas to enter only from the inlet section, the second one-way intake valve assembly 44 is connected to the inlet section of the intake channel through a pipeline, and the second one-way intake valve assembly 44 controls the gas to enter only from the intake channel.

[0082] In this embodiment, the first one-way air intake valve assembly 43 and the second one-way air intake valve assembly 44 have similar structures. The first one-way air intake valve assembly 43 and the second one-way air intake valve assembly 44 both include: a valve plug 401 and an elastic member 402, wherein the elastic member 402 elastically supports the valve plug 401 to block the air inlet;

[0083] When the gas flows from the valve plug 401 toward the elastic member 402, the gas pushes the valve plug 401 to compress the elastic member 402, the valve plug 401 is separated from the air inlet, the air inlet is opened, and the gas passes through;

[0084] When the gas flows from the elastic member 402 toward the valve plug 401 , the gas pushes the valve plug 401 to block the gas inlet. Example 2

[0085] Apply the above gas tank exhaust control system, refer to Figure 3 As shown, the present invention also discloses a gas storage tank exhaust control method, comprising the following steps:

[0086] S1. Determine the number of gas storage tanks, open the first gas storage tank, allow the gas in the first gas storage tank to enter from the air intake channel of the venturi tube, and discharge the gas in the first gas storage tank into the accumulator. When the gas pressure in the first gas storage tank is the same as the gas pressure in the accumulator, the exhaust process stops, and a certain amount of gas remains in the first gas storage tank;

[0087] S2, open the second gas tank, so that the gas in the second gas tank enters from the exhaust channel of the venturi tube, and discharges the gas in the second gas tank into the accumulator. When the gas in the second gas tank passes through the contraction section in the venturi tube, its flow rate increases and the pressure decreases. At this time, the residual gas in the first gas tank is adsorbed and discharged from the suction channel of the venturi tube into the accumulator;

[0088] S3, referring to step S2, opening subsequent gas storage tanks in sequence, allowing the gas in the subsequent gas storage tank to enter from the exhaust channel of the venturi tube, allowing the residual gas in the previous gas storage tank to be adsorbed and enter from the intake channel of the venturi tube, and the gas in the two gas storage tanks is discharged into the accumulator together;

[0089] S4, start the active exhaust device, first pressurize the gas in the last gas tank and let it enter from the exhaust channel of the venturi tube, at this time, the residual gas in the previous gas tank is adsorbed and enters from the intake channel of the venturi tube, and the gas in the two gas tanks is discharged into the accumulator together;

[0090] S5. Referring to step S4, the gas in the previous gas tank is pressurized and enters from the exhaust channel of the venturi tube in sequence, until the gas in the first gas tank is pressurized and enters from the exhaust channel of the venturi tube, so that the gas in all gas tanks is completely discharged into the accumulator.

[0091] The specific implementation steps of the gas tank exhaust control method of the present invention have been illustrated in Example 1 and will not be repeated here. Compared with the prior art exhaust method of exhausting all the gases in all gas tanks by active exhaust devices, the method of the present invention only needs to actively pressurize and exhaust all the remaining gases in the last gas tank, and the gases in other gas tanks will be partially or completely passively discharged, without consuming energy. On the premise of satisfying the exhaust of all gases, energy consumption is reduced.

[0092] Specifically, the gas tank exhaust control method of the present invention also includes: S6, setting a pressure threshold in the accumulator, detecting the actual pressure value of the gas in each gas tank and the accumulator in real time, and when the actual pressure value in the accumulator exceeds the pressure threshold, discharging the gas in the accumulator into 1-2 gas tanks with lower pressure that are being exhausted, and stopping exhausting the gas into the accumulator, which can avoid the accumulator being discharged due to excessive gas pressure therein, thereby preventing energy from being wasted.

[0093] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A gas tank exhaust control system, comprising: n gas storage tanks, n≥3, the first gas storage tank and the second gas storage tank are both provided with a first gas port and a second gas port; A passive exhaust device, comprising a venturi tube, wherein the venturi tube has an exhaust channel and an air intake channel, wherein the exhaust channel comprises: an inlet section, a contraction section and an expansion section, wherein the air intake channel is connected to the contraction section via a pipeline, wherein the first air port of the first air storage tank is connected to the air intake channel via a pipeline, and wherein the first air port of the second air storage tank is connected to the inlet section of the exhaust channel via a pipeline; an active exhaust device, wherein one end is connected to the second air ports of the first air storage tank and the second air storage tank via pipelines respectively, and the other end is connected to the inlet section of the exhaust channel via pipelines, wherein the active exhaust device can extract the gas in the first air storage tank and the second air storage tank and discharge it from the passive exhaust device under pressure; The first air port of the first air tank is connected only to the air intake passage through a pipeline; the first air ports of the second air tank to the n-1th air tank are connected not only to the inlet section of the exhaust passage through a pipeline, but also to the air intake passage through a pipeline; the first air port of the nth air tank is connected only to the inlet section of the exhaust passage through a pipeline; the second air ports of all air tanks are connected to the active exhaust device through a pipeline; and an accumulator is also included; When exhausting, the gas in the previous gas tank is first discharged normally through the venturi tube. When the gas pressure in the previous gas tank is equal to or lower than the use pressure, a certain amount of gas remains in the previous gas tank. At this time, the next gas tank is opened, and the gas in the next gas tank enters through the exhaust passage. When the gas in the next gas tank passes through the contraction section, the residual gas in the previous gas tank is adsorbed and enters from the suction passage. After all the gases in the n gas storage tanks enter from the exhaust passage, only the gas in the nth gas storage tank is the largest, and the gases in the remaining gas storage tanks will be partially or completely adsorbed and discharged. Through the active exhaust device, the gas in the nth gas storage tank is first pressurized and discharged from the exhaust passage. At this time, the residual gas in the n-1th gas storage tank is adsorbed and discharged from the intake passage. The gas in the previous gas storage tank is pressurized and enters from the exhaust passage in sequence, until the gas in the first gas storage tank is pressurized and enters from the exhaust passage, so that the gas in all the gas storage tanks is completely discharged into the accumulator.

2. The gas tank exhaust control system according to claim 1, characterized in that: The number of the gas storage tanks is 3 to 5.

3. The gas tank exhaust control system according to claim 1, characterized in that: The passive exhaust device also includes: a housing, wherein the venturi tube is disposed in the housing; A first one-way intake valve assembly is disposed in the housing, the first one-way intake valve assembly is connected to the inlet section of the exhaust passage through a pipeline, and the first one-way intake valve assembly controls gas to enter only from the inlet section; A second one-way air intake valve assembly is arranged in the housing. The second one-way air intake valve assembly is connected to the inlet section of the air intake passage through a pipeline. The second one-way air intake valve assembly controls gas to enter only from the air intake passage.

4. The gas tank exhaust control system according to claim 3, characterized in that: The first one-way air intake valve assembly and the second one-way air intake valve assembly both include: A valve plug and an elastic member, wherein the elastic member elastically supports the valve plug to block the air inlet; When the gas flows from the valve plug toward the elastic member, the gas pushes the valve plug to compress the elastic member, the valve plug is separated from the air inlet, the air inlet is opened, and the gas passes through; When the gas flows from the elastic member toward the valve plug, the gas pushes the valve plug to block the air inlet.

5. The gas tank exhaust control system according to claim 1, characterized in that: A switch check valve is arranged on the pipeline between the first gas port of the gas storage tank and the passive exhaust device.

6. The gas tank exhaust control system according to claim 1, characterized in that: An electromagnetic switch valve is arranged on the pipeline between the second air port of the air storage tank and the active exhaust device.

7. The gas tank exhaust control system according to claim 1, characterized in that: A first one-way valve is arranged on a pipeline between the active exhaust device and the inlet section of the exhaust passage.

8. The gas tank exhaust control system according to claim 1, characterized in that: The accumulator is connected to the expansion section of the exhaust passage through a pipeline, and the gas in the gas storage tank is discharged into the accumulator.

9. The gas tank exhaust control system according to claim 8, characterized in that: The pressure accumulator is provided with a pressure discharge port, which is communicated with the gas storage tank through a pipeline, and a second one-way valve is provided on the pipeline between the pressure discharge port and the gas storage tank.

10. The gas tank exhaust control system according to claim 8, characterized in that: Also includes: A plurality of pressure sensors are provided, wherein the plurality of pressure sensors are used to detect the gas pressure in the plurality of gas storage tanks and the pressure accumulator respectively.

11. The gas tank exhaust control system according to claim 1, characterized in that: The gas storage tank stores liquefied natural gas or hydrogen.

12. A method for controlling exhaust of a gas storage tank, using the gas storage tank exhaust control system according to any one of claims 1 to 11, characterized in that: The following steps are involved: S1. Determine the number of gas storage tanks, open the first gas storage tank, allow the gas in the first gas storage tank to enter from the air intake channel of the venturi tube, and discharge the gas in the first gas storage tank into the accumulator. When the gas pressure in the first gas storage tank is the same as the gas pressure in the accumulator, the exhaust process stops, and a certain amount of gas remains in the first gas storage tank; S2, open the second gas tank, so that the gas in the second gas tank enters from the exhaust channel of the venturi tube, and discharges the gas in the second gas tank into the accumulator. When the gas in the second gas tank passes through the contraction section in the venturi tube, its flow rate increases and the pressure decreases. At this time, the residual gas in the first gas tank is adsorbed and discharged from the suction channel of the venturi tube into the accumulator; S3, referring to step S2, opening subsequent gas storage tanks in sequence, allowing the gas in the subsequent gas storage tank to enter from the exhaust channel of the venturi tube, allowing the residual gas in the previous gas storage tank to be adsorbed and enter from the intake channel of the venturi tube, and the gas in the two gas storage tanks is discharged into the accumulator together; S4, start the active exhaust device, first pressurize the gas in the nth gas storage tank and let it enter from the exhaust channel of the venturi tube, at this time, the residual gas in the n-1th gas storage tank is adsorbed and enters from the intake channel of the venturi tube, and the gas in the two gas storage tanks is discharged into the accumulator together; S5. Referring to step S4, the gas in the previous gas tank is pressurized and enters from the exhaust channel of the venturi tube in sequence, until the gas in the first gas tank is pressurized and enters from the exhaust channel of the venturi tube, so that the gas in all gas tanks is completely discharged into the accumulator.

13. The gas tank exhaust control method according to claim 12, characterized in that: Also includes: S6. Set the pressure threshold in the accumulator, detect the actual pressure value of the gas in each gas storage tank and the accumulator in real time, and when the actual pressure value in the accumulator exceeds the pressure threshold, discharge the gas in the accumulator into 1-2 gas storage tanks with lower pressure that are being exhausted, and stop exhausting the gas into the accumulator.

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