Hydrogen nozzle with pressure adjusting function

Abstract

The utility model is applicable to the technical field of hydrogen engines, and provides a hydrogen nozzle with a pressure regulating function, which comprises a volume-variable shell, a fixed gas chamber, an intermittent motion module and a control module. According to the device, through the bionic cuttlefish structure, the stability of the hydrogen spraying amount can be achieved by regulating and controlling the change of the volume of the cavity according to pressure fluctuation in the air inlet channel. And the gas can be subjected to secondary pressurization, so that high-speed injection of hydrogen is realized. In addition, through cooperation of the controller and the sensors, the pressure fluctuation effect in the gas inlet channel can be fully utilized to achieve regulation and control at different injection moments, the hydrogen introduction capacity can be effectively improved, the uniformity of mixed gas in the gas inlet channel is improved, and the tempering occurrence probability is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydrogen engine technical field especially relates to a hydrogen nozzle with pressure regulating function. BACKGROUND

[0002] With the promotion of double carbon policy, the energy structure in the global range gradually transforms to low carbon, green and renewable energy. Hydrogen is considered as one of the most potential zero carbon fuels due to its clean and efficient combustion characteristics. In the field of hydrogen combustion engine, the main hydrogen fuel supply modes are intake port injection and cylinder direct injection. Cylinder direct injection has the characteristics of high charging efficiency and flexible injection strategy, but it needs to match high injection pressure, so the manufacturing cost is high, the system complexity is high and the requirements for injector durability and safety are high, so the practical application is difficult. In contrast, the hydrogen injection pressure of intake port is low, so the structure is simple, the transformation cost is low, and the existing injection device can be used, but it has the problems of backfire and low charge coefficient.

[0003] Research finds that the main reason for backfire problem is caused by high temperature hot spot in cylinder, residual exhaust gas and high hydrogen residue in air duct. In order to reduce the backfire risk and the influence of air duct gas jet expansion on engine intake blockage, it is necessary to reduce the hydrogen residue in the air duct while ensuring the hydrogen introduction and fresh air introduction capacity in the cylinder. The existing hydrogen nozzle is fixed in volume, and under the premise that the injector structure and injection pressure and injection duration are constant, the hydrogen injection amount is easily affected by the intake port pressure and the cylinder pressure. Therefore, even if the injection pressure and duration of the supply end are constant, the actual hydrogen injection amount of the injector will change, especially when the injection time is adjusted, the hydrogen injection amount of the injector will deviate greatly from the design value. UTILITY MODEL CONTENTS

[0004] The purpose of the utility model embodiment is to provide a hydrogen nozzle with pressure regulating function, which aims to solve the problems raised in the above background technology.

[0005] The utility model embodiment is implemented in the following way: a hydrogen nozzle with pressure regulating function, comprising: a variable volume shell, a fixed gas chamber, an intermittent motion module and a control module.

[0006] The variable volume shell comprises a front end fixed nozzle and a variable volume chamber, and the front end fixed nozzle is connected with the front end of the variable volume chamber.

[0007] The fixed gas chamber comprises a base and a gas flow channel, the rear end of the gas flow channel is communicated with a hydrogen supply device, and the front end of the gas flow channel is communicated with the rear end of the variable volume chamber.

[0008] The intermittent motion module is installed on the base and connected with the rear end of the variable volume chamber, and is used for pushing the variable volume chamber to inhale and exhale.

[0009] The control module is used for controlling the opening and closing of the front fixed nozzle and the start and stop of the intermittent motion module.

[0010] In a further technical solution, the front fixed nozzle is composed of two straight pipe sections parallel to the axis and connected by a tapered pipe section; the diameter ratio of the front nozzle section to the rear straight pipe section is 1:2.

[0011] In a further technical solution, the intermittent motion module comprises a spring, a push plate and an electric control mechanism; the spring is symmetrically distributed around the fixed gas flow channel at an angle of 90°, one end of the spring is connected with the push plate, and the other end is fixed on the base and stretched or contracted with the movement of the push plate.

[0012] The electric control mechanism is used for pushing the push plate to move along the axis, and the electric control mechanism comprises a T-shaped guide rail, a magnetic slider and a moving module; the T-shaped guide rail is fixed on the outside of the fixed gas flow channel, the magnetic slider is fixedly connected with the push plate, and the moving module is connected with the magnetic slider and used for pushing the magnetic slider to move along the axis.

[0013] In a further technical solution, the variable volume chamber is composed of eight completely same and symmetrically distributed shape memory alloy pieces and an external elastic film; the shape memory alloy piece has sufficient strength and elasticity, so that the alloy is always in the elastic deformation stage during the movement of the push plate. The front end of the variable volume chamber is communicated with the front fixed nozzle, and the rear end is fixed on the push plate; the front and rear ends are both provided with sealing rings to prevent hydrogen from leaking from the two ends.

[0014] In a further technical solution, the control module comprises a controller, a pressure sensor and a displacement sensor.

[0015] The displacement sensor is installed on any one spring and used for monitoring the deformation amount of the spring.

[0016] The pressure sensor is arranged on the outside of the front fixed nozzle and used for monitoring the pressure change in the inlet channel.

[0017] The controller is used for receiving the data of the pressure sensor and the displacement sensor, and controlling the start and stop of the moving module and the opening and closing time of the front fixed nozzle.

[0018] In a further technical solution, the controller is also used for controlling the opening and closing of the hydrogen supply device.

[0019] The hydrogen nozzle with pressure regulating function provided by the embodiment of the utility model can realize the stability of hydrogen injection amount through the change of the volume of the control chamber according to the pressure fluctuation in the air inlet, and can realize the high-speed injection of hydrogen through the secondary pressurization of the gas. In addition, the controller and the sensors can be matched to realize the regulation and control of different injection moments by making full use of the pressure fluctuation effect in the air inlet, which can effectively improve the hydrogen introduction capacity, increase the uniformity of the mixed gas in the air inlet, and reduce the probability of tempering. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure diagram of the hydrogen nozzle with pressure regulating function provided by the embodiment of the utility model;

[0021] Figure 2 The structure diagram of the electric control mechanism in the hydrogen nozzle with pressure regulating function provided by the embodiment of the utility model;

[0022] Figure 3 The structure diagram of the variable-volume shell in the hydrogen nozzle with pressure regulating function provided by the embodiment of the utility model;

[0023] Figure 4 The working diagram of the controller in the hydrogen nozzle with pressure regulating function provided by the embodiment of the utility model.

[0024] In the drawings: front-end fixed nozzle hole 1; variable-volume chamber 2; fixed gas flow channel 3; push plate 4; electric control mechanism 5; spring 6; base 7; T-shaped guide rail 8; magnetic sliding block 9; controller 10; moving module 11; pressure sensor 12; displacement sensor 13; hydrogen supply device 14. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0026] The specific implementation of the utility model is described in detail in combination with specific embodiments.

[0027] As Figures 1-4 shown, the hydrogen nozzle with pressure regulating function provided by the embodiment of the utility model is based on the principle of bionics, refers to the water injection movement process of cuttlefish, and realizes the regulation and control of the injection pressure by using the change of the volume of the gas chamber. The hydrogen nozzle comprises: a variable-volume shell, a fixed gas chamber, an intermittent movement module and a control module.

[0028] The volume-variable casing comprises a front-end fixed nozzle 1 and a volume-variable chamber 2, wherein the front-end fixed nozzle 1 is connected with the front end of the volume-variable chamber 2;

[0029] The fixed gas chamber comprises a base 7 and a gas flow channel 3, wherein the rear end of the gas flow channel 3 is communicated with a hydrogen supply device 14, and the front end of the gas flow channel 3 is communicated with the rear end of the volume-variable chamber 2;

[0030] The intermittent motion module is installed on the base and connected with the rear end of the volume-variable chamber 2, and is used for pushing the volume-variable chamber 2 to inhale and exhale;

[0031] The control module is used for controlling the opening and closing of the front-end fixed nozzle 1 and the start and stop of the intermittent motion module.

[0032] As shown in Figure 3 As a preferred embodiment of the utility model, the front-end fixed nozzle 1 is composed of two straight pipe sections parallel to the axis, and the middle part is connected through a tapered pipe section; the diameter ratio of the front-end nozzle section to the rear straight pipe section is 1:2.

[0033] When the half-cone angle θ of the tapered pipe section is small, the flow direction of the gas flow in the pipe section changes gently, which can effectively reduce the generation of gas flow separation and vortex, thereby reducing the flow resistance. The relationship between the length L of the tapered pipe section and the large-end diameter D, the small-end diameter d and the half-cone angle θ is When designing, θ and L can be selected according to the allowed space and the gas flow characteristics to balance the flow resistance and the pipe section size.

[0034] In the embodiment of the utility model, the tapered pipe section makes the gas flow more smooth and reduces the flow resistance. The front-end nozzle section is arranged with a valve for controlling the opening and closing of the nozzle. When in the inhaling process, the valve is closed, which can prevent the gas from being sucked back. When in the exhaling process, the valve is automatically opened until the end of the exhaling process.

[0035] As shown in Figure 1 As a preferred embodiment of the utility model, the intermittent motion module comprises a spring 6, a push plate 4 and an electric control mechanism 5; the spring 6 is 90° center-symmetrically distributed around the fixed gas flow channel 3, one end of the spring 6 is connected with the push plate 4, and the other end is fixed on the base 7 and stretched or contracted with the movement of the push plate;

[0036] The electric control mechanism 5 is used for pushing the push plate 4 to move along the axis, and the electric control mechanism 5 comprises a T-shaped guide rail 8, a magnetic sliding block 9 and a moving module 11, the T-shaped guide rail 8 is fixed on the outside of the fixed gas flow channel 3, the magnetic sliding block 9 is fixedly connected with the push plate 4, and the moving module 11 is connected with the magnetic sliding block 9 and used for pushing the magnetic sliding block 9 to move along the axis;

[0037] In the process of air intake, the T-shaped guide rail 8 is electrified, the T-shaped guide rail 8 generates a magnetic force opposite to the magnetic slider 9, the two are tightly attached due to the magnetic force, and meanwhile the control module controls the mobile module 11 to be turned on, drives the magnetic slider 9 to move upwards along the T-shaped guide rail 8, and the spring 6 is stretched. In the process of air exhaust, the control module controls the T-shaped guide rail 8 and the mobile module 11 to be powered off, the magnetic force of the T-shaped guide rail 8 disappears, the push plate 4 drives the magnetic slider 9 to quickly retract under the elastic force of the spring 6, and the hydrogen injection process is completed.

[0038] In the embodiment of the utility model, the T-shaped guide rail 8 can ensure that the magnetic slider 9 does not separate from the push plate 4 during the return process of the push plate 4, so as to carry out the next hydrogen injection process. The mobile module 11 can adopt a conventional linear mobile module in the prior art, and will not be described in detail here.

[0039] As shown in Figure 1 and Figure 3 As a preferred embodiment of the utility model, the variable volume chamber 2 is composed of eight completely same and center-symmetrically distributed shape memory alloy sheets and an external elastic film. The shape memory alloy sheet has sufficient strength and elasticity, which ensures that the alloy is always in the elastic deformation stage during the movement of the push plate. The external elastic film has sufficient strength and good sealing performance, which can ensure that the deformation amount generated with the axial movement is always within the elastic range and does not leak. The front end of the variable volume chamber 2 is communicated with the front-end fixed jet hole 1, and the rear end is fixed on the push plate 4. Sealing rings are arranged at the front end and the rear end to prevent hydrogen from leaking from the two ends.

[0040] In the embodiment of the utility model, sealing rings are arranged at the connection of the variable volume chamber 2 to prevent gas leakage and external gas from entering.

[0041] As shown in Figure 1 As a preferred embodiment of the utility model, the control module includes a controller 10, a pressure sensor 12 and a displacement sensor 13.

[0042] The displacement sensor 13 is installed on any one spring 6 and is used for monitoring the deformation amount of the spring 6.

[0043] The pressure sensor 12 is arranged outside the front-end fixed jet hole 1 and is used for monitoring the pressure change in the air intake passage.

[0044] The controller 10 is used for receiving the data of the pressure sensor 12 and the displacement sensor 13, and adjusting the start-stop time of the mobile module 11 and the opening-closing time of the front-end fixed jet hole 1, so as to control the movement distance of the magnetic slider 9 and further control the intake pressure.

[0045] As shown in Figure 4As shown, as a preferred embodiment of the utility model, the controller 10 is also used for controlling the opening and closing of the hydrogen supply device 14.

[0046] In the embodiment of the utility model, when working, the controller 10 controls the hydrogen supply device 14 to open, and the front end fixed spray hole 1 to close, at this time, hydrogen fills the entire nozzle inside with certain pressure, and the T-shaped guide rail 8 is electrified, and the moving module 11 starts.In the magnetic force, the T-shaped guide rail 8 and the magnetic slider 9 are attracted, the magnetic slider 9 is driven along the T-shaped guide rail 8 and moves upward under the driving of the moving module 11, drives the push plate 4 to move upward and stretches the spring 6, and the variable volume chamber 2 increases in volume.The controller 10 receives the data feedback of the pressure sensor 12 and the displacement sensor 13, determines the movement distance of the magnetic slider 9 according to the different pressure fluctuations in the inlet passage.The magnetic slider 9 moves to the specified position, the controller 10 controls the hydrogen supply device 14 to close, the front end fixed spray hole 1 to open, the moving module 11 and the T-shaped guide rail 8 to be powered off, the T-shaped guide rail 8 to disappear magnetically, the magnetic slider 9 and the T-shaped guide rail 8 to separate, and the magnetic slider 9 and the push plate 4 to be quickly pulled back under the elastic force of the spring 6, the volume of the variable volume chamber 2 is reduced, and the hydrogen injection process is completed.

[0047] Working principle: the controller 10 controls the T-shaped guide rail 8 to be electrified to generate opposite magnetism with the magnetic slider 9, and the two are closely attached due to magnetic force, and at the same time, the controller 10 controls the motor 44 to be opened to drive the magnetic slider 9 to drive the push plate 4 to move upward along the T-shaped guide rail 8, and the variable volume shell 2 increases in volume.During this process, the controller 10 controls the front end fixed spray hole 1 to be in closed state all the time, and controls the hydrogen supply device 14 to be opened to deliver hydrogen to the fixed gas passage 3.The controller 10 receives data from the pressure sensor 12, sets the movement distance of the magnetic slider 9 according to different inlet passage pressures, and receives data from the displacement sensor 13.After reaching the specified distance, the controller 10 controls the T-shaped guide rail 8 and the moving module 11 to be powered off, and enters the exhaust stage.At this time, the magnetism of the T-shaped guide rail 8 disappears, and the T-shaped guide rail 8 and the magnetic slider 9 separate.Under the elastic force of the spring 6, the push plate 4 drives the magnetic slider 9 to be quickly pulled back along the axial direction, and the volume of the variable volume chamber 2 is reduced.At the same time, the controller 10 controls the hydrogen supply device 14 to stop supplying hydrogen, and the front end fixed spray hole 1 is opened, and the hydrogen injection process is completed.In addition, the controller 10 will control the hydrogen injection time according to the pressure sensor 12 output data to match the inlet passage pressure fluctuation, select the best hydrogen injection time, and maximize the hydrogen injection amount.

[0048] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A hydrogen nozzle with pressure regulating function, characterized by, The utility model relates to a hydrogen storage tank, comprising: A variable volume shell, a fixed gas chamber, an intermittent motion module and a control module; The variable volume shell comprises a front-end fixed nozzle and a variable volume chamber, and the front-end fixed nozzle is connected with the front end of the variable volume chamber; the front-end fixed nozzle is composed of two straight pipe sections parallel to the axis, and the two straight pipe sections are connected by a tapered pipe section; the diameter ratio of the front-end nozzle section to the rear straight pipe section is 1:2; The fixed gas chamber comprises a base and a gas flow channel, the rear end of the gas flow channel is communicated with a hydrogen supply device, and the front end of the gas flow channel is communicated with the rear end of the variable volume chamber; The intermittent motion module comprises a spring, a push plate and an electric control mechanism; the spring is distributed symmetrically around the fixed gas flow channel at an angle of 90 degrees, one end of the spring is connected with the push plate, and the other end is fixed on the base and stretched or contracted with the movement of the push plate; the electric control mechanism is used for driving the push plate to move along the axial direction; The control module is used for controlling the opening and closing of the front-end fixed nozzle and the start and stop of the intermittent motion module.

2. The pressure regulated hydrogen nozzle of claim 1, wherein, The length L of the tapered tube segment is related to the large end diameter D, the small end diameter d, and the half-cone angle θ as follows: .

3. The pressure regulated hydrogen nozzle of claim 1, wherein, The electric control mechanism comprises a T-shaped guide rail, a magnetic slider and a moving module, the T-shaped guide rail is fixed on the outer side of the fixed gas flow channel, the magnetic slider is fixedly connected with the push plate, and the moving module is connected with the magnetic slider and used for driving the magnetic slider to move along the axial direction.

4. The pressure regulated hydrogen nozzle of claim 1, wherein, The variable volume chamber is composed of eight shape memory alloy pieces which are completely the same and distributed symmetrically at the center and an external elastic film; The variable volume chamber is communicated with the front-end fixed nozzle at the front end and fixed on the push plate at the rear end; sealing rings are arranged at the front end and the rear end.

5. The pressure regulated hydrogen nozzle of claim 3, wherein, The control module comprises a controller, a pressure sensor and a displacement sensor; The displacement sensor is installed on any spring and used for monitoring the deformation amount of the spring; The pressure sensor is arranged on the outer side of the front-end fixed nozzle and used for monitoring the pressure change in the gas inlet channel; The controller is used for receiving the data of the pressure sensor and the displacement sensor and controlling the start and stop of the moving module and the opening and closing time of the front-end fixed nozzle.

6. The pressure regulated hydrogen nozzle of claim 5, wherein, The controller is also used for controlling the opening and closing of the hydrogen supply device.

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