Closed air supply device of hydrogen engine

Abstract

The utility model discloses a closed air supply device of a hydrogen engine. The closed air supply device comprises a safety monitoring system, an air mixing box, an air supply pipeline and an air supply pipeline, the air supply pipeline comprises an air inlet pipe, an air pump, a hydrogen pump, a one-way valve, and an air inlet and a hydrogen inlet of a gas mixing box; the gas supplementing pipeline comprises a mixed gas outlet of the gas mixing box, an electromagnetic valve, a second module and a third module which are connected in sequence; a flow path of the gas supply pipeline is as follows: hydrogen mixed gas from a crankcase enters a hydrogen inlet of a gas mixing box after sequentially passing through a hydrogen pump and a one-way valve; fresh air from the outside enters the air inlet of the gas mixing box after passing through the air inlet pipe, the air pump and the one-way valve; and a flow path of the gas supplementing pipeline is as follows: mixed gas from an outlet of the gas mixing box flows into the engine through an electromagnetic valve.

Description

Technical Field

[0001] The utility model belongs to the technical field of internal combustion engines, and in particular relates to a closed air supply device for a hydrogen engine. Background Art

[0002] As people pay more attention to environmental issues and traditional energy is increasingly depleted, hydrogen, an efficient, clean, and renewable alternative fuel for internal combustion engines, has attracted people's attention. Hydrogen has high energy density, a wide flammable range, low ignition energy, and no carbon emissions when burned. However, the current hydrogen internal combustion engine piston sealing technology is difficult to ensure that unburned hydrogen escapes into the crankcase. In actual practice, the hydrogen concentration in the crankcase of a hydrogen engine can even reach more than 100,000 ppm under high engine load conditions, which far exceeds the explosion limit of hydrogen. Whether in the experimental process or in the actual installation of the engine, there are certain safety risks. If the crankcase ventilation is designed as an open structure, it has no practical significance for installation. Summary of the invention

[0003] In order to overcome the problems existing in the prior art, the utility model provides a closed air supply device for a hydrogen engine, which reduces the hydrogen concentration in the crankcase of the hydrogen engine, reduces the mixture of hydrogen and air to within the explosion limit of hydrogen to ensure safety, realizes closed-loop air supply for the hydrogen engine, and integrates all the equipment into the same frame, which is simple and convenient to operate, safe and reliable, etc. The utility model solves the risk of explosion caused by excessive hydrogen concentration in the crankcase of the hydrogen engine and the problem of closed-loop air intake and air supply for the crankcase ventilation, and the equipment is safe and reliable.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A closed gas supply device for a hydrogen engine includes a safety monitoring system, a gas mixing box, a gas supply pipeline and a gas supply pipeline;

[0006] The gas mixing box is used to mix the hydrogen mixed gas and air from the gas supply pipeline and provide the engine with a mixed gas with a hydrogen mixed gas concentration lower than 40000ppm, and includes an air inlet, a hydrogen inlet and a circuit inlet, and a mixed gas outlet;

[0007] The gas supply pipeline includes an air inlet pipe, an air pump, a hydrogen pump, a one-way valve, and an air inlet and a hydrogen inlet of a gas mixing box;

[0008] The air supply pipeline includes a mixed gas outlet of a gas mixing box, a solenoid valve, and an engine which are connected in sequence;

[0009] The flow path of the gas supply pipeline is as follows: the hydrogen mixed gas from the crankcase enters the hydrogen inlet of the gas mixing box through the hydrogen pump and the one-way valve in sequence; the fresh air from the outside enters the air inlet of the gas mixing box through the intake pipe, the air pump and the one-way valve;

[0010] The flow path of the air supply pipeline is as follows: the mixed gas from the outlet of the gas mixing box flows into the engine through the solenoid valve;

[0011] The safety monitoring system comprises a controller, a first module, a second module and a third module; the controller is electrically connected to and communicates with the ECU, the air pump, the hydrogen pump, the first module, the solenoid valve, the second module and the third module respectively, and the communication protocol adopts CAN communication;

[0012] The controller changes the power of the hydrogen pump, turns on / off the hydrogen pump, the air pump and the solenoid valve, and changes the power of the hydrogen pump and the air pump according to the ECU control signal;

[0013] The first module is located in the gas mixing box and is used to detect the hydrogen concentration and gas pressure in the gas mixing box; the second module and the third module are located on the gas supply pipeline, the second module is used to detect the hydrogen concentration and gas pressure in the gas supply pipeline; the third module is used to detect the mixed gas flow and temperature in the gas supply pipeline.

[0014] Furthermore, the device also includes an air supply circuit, which connects the loop inlet of the gas mixing box and the air supply pipeline, so that the hydrogen mixture in the air supply pipeline returns to the gas mixing box for mixing; the controller opens / closes the solenoid valve on the air supply circuit according to the data collected by the first module, the second module and the third module, thereby opening / closing the air supply circuit.

[0015] Furthermore, the controller is externally connected to a 24V power supply for power supply.

[0016] Furthermore, the one-way valve is used to prevent the hydrogen mixed gas in the gas mixing box from flowing back when the hydrogen pump / air pump is not working.

[0017] Furthermore, a one-way valve is arranged on the intake pipe toward the inlet of the air pump; a one-way valve is arranged between the air pump outlet and the air inlet of the gas mixing box; a one-way valve is arranged between the hydrogen pump outlet and the hydrogen inlet of the gas mixing box; and a one-way valve is arranged between the crankcase and the inlet of the hydrogen pump.

[0018] Furthermore, the first module includes a hydrogen concentration sensor and a pressure sensor; the second module and the third module are sequentially arranged on the air supply pipeline, the second module includes a hydrogen concentration sensor and a pressure sensor, and the third module includes a flow meter and a temperature sensor.

[0019] Compared with the prior art, the beneficial effects brought about by the technical solution of the utility model are:

[0020] The device described in the utility model can extract the hydrogen mixed gas in the crankcase of the hydrogen engine, and reduce the hydrogen mixed gas to within the hydrogen explosion limit (40000ppm) by mixing with air to ensure safety. At the same time, the device can realize the closed-loop air replenishment of the hydrogen engine. All equipment is integrated into the same frame, which is simple and convenient to operate, safe and reliable, and has practical significance for loading. The utility model solves the risk of explosion caused by excessive hydrogen concentration in the crankcase of the hydrogen engine and the problem of closed-loop air intake and air replenishment of the crankcase ventilation, and the equipment is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the hydrogen engine air replenishing device of the utility model;

[0022] Figure 2 is a gas supply working flow chart of the hydrogen engine gas replenishing device;

[0023] Figure 3 The present invention is a gas replenishment working flow chart of the gas replenishment device for the hydrogen engine.

[0024] In the figure:

[0025] 1. Gas mixing box, 2. First module, 3. Air intake pipe, 4. Air pump, 5. Controller, 6. Hydrogen pump, 7. One-way valve, 8. Solenoid valve, 9. Second module, 10. Third module, 11: Air supply pipeline, 12: Air supply circuit, 13:

[0026] Air inlet, 14: Hydrogen inlet, 15: Circuit inlet, 16: Mixed gas outlet. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme, beneficial effects and significant progress of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model is clearly and completely described below in combination with the drawings provided in the examples of the utility model. Obviously, all the described embodiments are only partial embodiments of the utility model, rather than all embodiments; based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] In the description of this application, unless otherwise clearly specified and limited, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; unless otherwise specified or explained, the terms "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] like Figure 1 As shown, a closed gas supply device for a hydrogen engine includes a safety monitoring system, a gas mixing box 1, a gas supply pipeline, a gas supply pipeline and a gas supply circuit 12. The gas supply pipeline includes an intake pipe 3, an air pump 4, a hydrogen pump 6, a one-way valve 7 and an inlet of the gas mixing box 1; the gas supply pipeline includes an outlet of the gas mixing box 1, an explosion-proof solenoid valve 8, a second module 9 and a third module 10 connected in sequence; each component is connected by a pipeline. The gas supply circuit 12 is used to connect the circuit inlet 15 of the gas mixing box 1 and the gas supply pipeline, so that the hydrogen mixed gas in the gas supply circuit returns to the gas mixing box 1 for mixing. There is a solenoid valve (not shown in the figure) on the gas supply circuit to control the opening and closing of the gas supply circuit.

[0030] The inlet of the air pump 4 is connected to the intake pipe 3 for introducing fresh air through the intake pipe 3, and a one-way valve 7 is provided on the intake pipe 3; the outlet of the air pump 4 is connected to the air inlet of the gas mixing box 1 through the one-way valve 7; the inlet of the hydrogen pump 6 is connected to the crankcase (not shown in the figure) through the one-way valve 7, and the outlet of the hydrogen pump 6 is connected to the hydrogen inlet of the gas mixing box 1 through the one-way valve 7. The outlet of the gas mixing box 1 is connected to the engine through the air supply pipeline 11.

[0031] The gas mixing box 1 comprises three inlets and one outlet, namely an air inlet 13 , a hydrogen inlet 14 , a circuit inlet 15 , and a mixed gas outlet 16 .

[0032] The safety monitoring system includes a controller 5, a first module 2, a second module 9 and a third module 10. The controller 5 is powered by an external 24V power supply, and the controller 5 communicates with the ECU, the air pump 4, the hydrogen pump 6, the first module 2, the explosion-proof solenoid valve 8, the second module 9 and the third module 10 through communication lines, and the communication protocol adopts CAN communication.

[0033] The controller controls the hydrogen pump 6 , the air pump 4 and the solenoid valve 8 to open / close.

[0034] The one-way valve 7 is used to prevent the hydrogen mixed gas in the gas mixing box 1 from flowing back when the hydrogen pump 6 / air pump is not working.

[0035] The first module 2 is arranged in the gas mixing box 1, and includes a hydrogen concentration sensor and a pressure sensor. The hydrogen concentration sensor and the pressure sensor both communicate with the controller 5 through a communication line. The first module 2 includes a hydrogen concentration sensor and a pressure sensor, which are used to detect the hydrogen concentration and gas pressure in the gas mixing box 1.

[0036] The second module 9 and the third module 10 are sequentially arranged on the air supply pipeline. The second module 9 includes a hydrogen concentration sensor and a pressure sensor for detecting the hydrogen concentration and gas pressure in the air supply pipeline to avoid danger caused by excessive pressure; the third module 10 includes a flow meter and a temperature sensor for detecting the flow rate and temperature in the air supply pipeline.

[0037] The hydrogen pump 6 is used to absorb the hydrogen mixed gas in the crankcase and transport it to the gas mixing box 1.

[0038] The solenoid valve 8 is an explosion-proof solenoid valve, which is used to urgently cut off the gas supply to the hydrogen engine when the engine backfires, thereby cutting off the hydrogen from the source.

[0039] like Figure 2-3 As shown, the use process of the closed air supply device for the hydrogen engine is as follows:

[0040] When in use, the closed air supply device of the hydrogen engine is turned on, and the controller 5 is powered by a 24V power supply;

[0041] The ECU transmits a control signal to the controller 5 according to the engine load and the hydrogen concentration in the crankcase. The controller 5 changes the power of the hydrogen pump 6 and starts the hydrogen pump. The hydrogen pump 6 extracts the hydrogen mixed gas in the crankcase through the pipeline. The hydrogen mixed gas enters the gas mixing box 1 through the hydrogen pump 6 and the one-way valve 7 in sequence.

[0042] The ECU transmits a control signal to the controller 5 according to the hydrogen concentration in the gas mixing box 1. The controller 5 turns on the power of the air pump 4, starts the air pump 4, and the fresh air from the outside enters the inlet of the air pump 4 through the intake pipe 3. The air enters the gas mixing box 1 through the air pump 4 and the one-way valve 7 in sequence.

[0043] The hydrogen concentration sensor and the pressure sensor in the first module 2 detect the hydrogen concentration and the gas pressure in the gas mixing box 1 respectively to avoid danger caused by excessive pressure, and transmit the detected values ​​to the controller in real time;

[0044] When the hydrogen concentration in the gas mixing box 1 exceeds 40000ppm, the controller increases the power of the air pump 4 to allow more air to enter the gas box, thereby reducing the hydrogen concentration in the gas box, so that the hydrogen concentration in the gas mixing box 1 is always lower than 40000ppm;

[0045] Otherwise, when the concentration of the hydrogen mixed gas in the gas mixing box 1 is lower than 40000ppm, the engine is supplemented with gas; for specific steps, refer to Figure 3 As shown, specifically including:

[0046] The solenoid valve 8 is opened, and the hydrogen concentration sensor and the pressure sensor in the second module 9 respectively detect the hydrogen concentration and the gas pressure in the gas supply pipeline; the gas mass flow meter and the temperature sensor in the third module 10 respectively detect the mass flow and the temperature of the mixed gas in the gas supply pipeline;

[0047] If the hydrogen concentration sensor detects that the concentration of the hydrogen mixture in the air supply pipeline is higher than 40000ppm, the solenoid valve (not shown in the figure) on the air supply circuit 12 is opened, and the mixed hydrogen mixture is mixed into the gas mixing box 1 to continue to reduce the hydrogen concentration. The pressure sensor in the second module 2 and the temperature sensor in the third module 10 monitor the temperature and pressure of the mixed gas in the air supply pipeline at this time to provide sufficient parameters to provide reference for other subsequent optimizations.

[0048] The whole detection process is simple and convenient. The hydrogen mixture in the crankcase of the hydrogen engine is extracted, and the hydrogen mixture is mixed with air to reduce the hydrogen explosion limit (40000ppm) to ensure safety. At the same time, the device can realize the closed-loop air replenishment of the hydrogen engine. All equipment is integrated into the same frame, using the engine power supply and ECU, and the operation is simple and convenient, safe and reliable, etc., which has practical significance for vehicle installation. The utility model solves the risk of explosion caused by excessive hydrogen concentration in the crankcase of the hydrogen engine and the problem of closed-loop air intake and air replenishment of the crankcase ventilation, and the equipment is safe and reliable.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A closed air supply device for a hydrogen engine, characterized in that It includes a safety monitoring system, a gas mixing box (1), a gas supply pipeline and a gas replenishment pipeline; The gas mixing box (1) is used to mix the hydrogen mixed gas and air from the gas supply pipeline and provide the engine with a mixed gas with a hydrogen mixed gas concentration lower than 40000 ppm, and comprises an air inlet (13), a hydrogen inlet (14), a circuit inlet (15) and a mixed gas outlet (16); The gas supply pipeline comprises an air inlet pipe (3), an air pump (4), a hydrogen pump (6), a one-way valve (7), and an air inlet (13) and a hydrogen inlet (14) of a gas mixing box (1); The gas supply pipeline comprises a mixed gas outlet (16) of a gas mixing box (1), a solenoid valve (8) and a hydrogen engine which are connected in sequence; The flow path of the gas supply pipeline is as follows: the hydrogen mixed gas from the crankcase passes through the hydrogen pump (6) and the one-way valve (7) in sequence and then enters the hydrogen inlet of the gas mixing box (1); the fresh air from the outside passes through the intake pipe (3), the air pump (4) and the one-way valve (7) and then enters the air inlet of the gas mixing box (1); The flow path of the air supply pipeline is as follows: the mixed gas from the outlet of the gas mixing box (1) flows into the engine through the solenoid valve (8); The safety monitoring system comprises a controller (5), a first module (2), a second module (9) and a third module (10); the controller (5) is electrically connected to and communicates with the ECU, the air pump (4), the hydrogen pump (6), the first module (2), the solenoid valve (8), the second module (9) and the third module (10), respectively, and the communication protocol adopts CAN communication; The controller changes the power of the hydrogen pump (6), turns on / off the hydrogen pump (6), the air pump (4) and the solenoid valve (8), and changes the power of the hydrogen pump (6) and the air pump (4) according to the ECU control signal; The ECU transmits a control signal to the controller (5) according to the hydrogen concentration in the gas mixing box (1), and the controller (5) turns on the power of the air pump (4), starts the air pump (4), and fresh air from the outside enters the inlet of the air pump (4) through the intake pipe (3), and the air enters the gas mixing box (1) through the air pump (4) and the one-way valve (7) in sequence; The first module (2) is used to detect the hydrogen concentration and gas pressure in the gas mixing box (1); the second module (9) is used to detect the hydrogen concentration and gas pressure in the gas supply pipeline; and the third module (10) is used to detect the mixed gas flow and temperature in the gas supply pipeline.

2. The closed air supply device for a hydrogen engine according to claim 1, characterized in that The device also includes an air supply circuit (12), wherein the air supply circuit is connected to a circuit inlet (15) of the gas mixing box (1) and an air supply pipeline, and the controller opens / closes the solenoid valve on the air supply circuit according to data collected by the first module (2), the second module (9) and the third module (10), thereby opening / closing the air supply circuit.

3. The closed air supply device for a hydrogen engine according to claim 1, characterized in that: The controller (5) is externally connected to a 24V power supply for power supply.

4. The closed air supply device for a hydrogen engine according to claim 1, characterized in that: The one-way valve (7) is used to prevent the hydrogen mixed gas in the gas mixing box (1) from flowing back when the hydrogen pump (6) / air pump (4) is not working.

5. The closed air supply device for a hydrogen engine according to claim 1, characterized in that: The first module (2) is arranged in the gas mixing box (1) and comprises a hydrogen concentration sensor and a pressure sensor; the second module (9) and the third module (10) are arranged in sequence on the gas supply pipeline, the second module (9) comprises a hydrogen concentration sensor and a pressure sensor, and the third module (10) comprises a flow meter and a temperature sensor.

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