Mechanical gas stove based on mixed gas of natural gas and hydrogen

Abstract

The invention discloses a mechanical gas stove based on natural gas and hydrogen mixed gas, and belongs to the technical field of gas flow regulation, the mechanical gas stove comprises a heating power collection module and a safety control module, the heating power collection module comprises a heat conduction block, the heat conduction block is connected with an air bag through a heat pipe, one side of the air bag is connected with a mechanical regulation module, and the mechanical regulation module is connected with the safety control module. The mechanical adjusting module comprises a valve rod, a butterfly valve and a spring which are sequentially connected. According to the mechanical gas stove based on the natural gas and hydrogen mixed gas, on the premise that electronic control is not needed, mechanical thermal driving serves as a core, low-cost, high-response and high-safety gas flow self-adaptive adjustment is achieved, and the mechanical gas stove meets the strict scene requirements of household gas equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of gas flow regulation, and in particular to a mechanical gas stove based on a mixture of natural gas and hydrogen. Background Art

[0002] In the field of gas regulation technology, an existing gas regulation system based on electronic sensors relies on a temperature sensor + microcontroller to achieve closed-loop control. However, this system suffers from high costs (the use of electronic components results in a system cost exceeding 2,000 yuan, making it difficult to popularize in household scenarios), insufficient environmental adaptability (the failure rate of electronic components increases in high temperature or humid environments), and poor reliability. Existing solutions for using metal thermal expansion elements to drive valves suffer from response delays (metal has slow thermal conductivity, valve regulation lags by about 10 seconds, and cannot match rapid flame changes) and nonlinear regulation (the metal expansion coefficient is low and is easily affected by temperature gradients, resulting in large flow control errors).

[0003] At the same time, existing valve designs (such as API 6D standard ball valves) are not optimized for hydrogen permeation, which leads to hydrogen molecules easily leaking through the micropores of rubber seals, posing a leakage risk and lacking a quick shut-off mechanism; the traditional spring-valve stem structure will have problems with nonlinear adjustment and easy aging of materials due to friction resistance. Summary of the Invention

[0004] The purpose of the present invention is to provide a mechanical gas stove based on a mixture of natural gas and hydrogen. Without the need for electronic control, it takes mechanical thermal drive as the core to achieve low-cost, high-response, and high-safety adaptive adjustment of gas flow, adapting to the stringent scenario requirements of household gas equipment.

[0005] To achieve the above objectives, the present invention provides a mechanical gas stove based on a mixture of natural gas and hydrogen, including a heat collection module and a safety control module. The heat collection module includes a heat conduction block, which is connected to an air bag via a heat pipe. One side of the air bag is connected to a mechanical adjustment module, which includes a valve stem, a butterfly valve and a spring connected in sequence.

[0006] Preferably, the heat conduction block is placed on the right side of the flame of the gas stove, the airbag is a double-layer high-temperature resistant silica gel airbag, both sides of the airbag are provided with metal shells, and the airbag is filled with ethanol or nitrogen.

[0007] Preferably, the inner wall of the heat pipe is a copper shell, the internal working fluid of the heat pipe is ammonia, the two ends of the heat pipe are an evaporation section and a condensation section respectively, the evaporation section is connected to the heat conduction block, and the condensation section is connected to the air bag.

[0008] Preferably, the length of the evaporation section is 50 mm, and the length of the condensation section is 200 mm.

[0009] Preferably, the valve stem is chrome-plated and has a built-in linear bearing.

[0010] Preferably, the end of the spring is connected to the gas regulating valve, the spring is made of stainless steel, and the preload adjustment range is 50-200N.

[0011] Preferably, the safety control module includes a hydrogen concentration sensor, which is connected to the emergency shut-off valve via a separate signal line, and the actuating end of the emergency shut-off valve is placed in the main gas line.

[0012] Preferably, the gas stove is packaged in an integrated manner, and the heat pipe, air bag and butterfly valve adopt an integrated shell.

[0013] Therefore, the present invention adopts the above-mentioned mechanical gas stove based on the mixed gas of natural gas and hydrogen, which has the following technical effects:

[0014] Effectively reduce system costs: Adopting pure thermal feedback drive (non-electronic control), eliminating dependence on sensors and microcontrollers, the cost of the basic solution is controlled at 500-1500 yuan, which is significantly lower than the 2000 yuan or more of the electronic control system, making it suitable for home scenarios and popularization.

[0015] Improve thermal response speed: Through the heat pipe-airbag coupling design, the valve adjustment response time is shortened from 10-30 seconds of traditional metal components to 1-3 seconds, achieving real-time matching of flame temperature changes and avoiding the lag of traditional systems.

[0016] Enhanced hydrogen environment safety: integrated hydrogen concentration sensor and emergency shut-off valve (response time < 3 seconds), combined with hydrogen permeation resistant sealing material (permeability < 1×10 -8 cc / cm 2 ·s), directly reducing the risk of leakage to 1 / 100 of the industry standard. The emergency shut-off valve complies with ATEX explosion-proof standards, directly reducing the risk of explosion.

[0017] Optimized mechanical adjustment linearity: Through the dynamic balance calculation of spring preload and airbag expansion force, combined with a low-friction valve stem (friction coefficient <0.05), the flow control error is reduced from ±20% to ±5%.

[0018] Improve system integration and maintenance convenience: adopt modular layout (heat pipe-air bag-valve integrated packaging), reduce installation space requirements by 70% (only 0.15m 3 ), maintenance time is reduced from 2 hours to less than 30 minutes.

[0019] Environmental adaptability and durability: Heat pipes and air bags can work stably at -50℃ to 200℃ (traditional electronic components only support 0-70℃).

[0020] Material life: Silicone airbag life ≥ 2 years (traditional rubber ≤ 1 year), reducing replacement frequency.

[0021] No external energy reliance, purely thermally driven: No electricity or complex control circuits are required, avoiding the risk of electronic system failure in high temperature and humid environments.

[0022] Improved energy efficiency: The heat transfer efficiency of the heat pipe reaches 5000W / m·K (12.5 times that of copper), and the thermal energy utilization rate is increased by 40%.

[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of a first embodiment of a mechanical gas stove based on a mixture of natural gas and hydrogen according to the present invention.

[0025] Reference numerals

[0026] 1. Burner; 2. Gas main line; 3. Heat transfer block; 4. Hydrogen concentration sensor; 5. Heat pipe; 6. Air bag; 7. Valve stem; 8. Butterfly valve; 9. Spring; 10. Gas stove regulating valve; 11. Emergency shut-off valve. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0028] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words “include” or “comprise” and the like used in the present invention mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as “connect” or “connected” and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Up”, “down”, “left”, “right” and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0029] Example 1: Basic mechanical gas flow regulation system

[0030] like Figure 1As shown, the present invention provides a mechanical gas stove based on a mixture of natural gas and hydrogen, including a heat collection module and a safety control module. The heat collection module includes a heat conduction block 3, which is connected to an airbag 6 through a heat pipe 5. The heat conduction block 3 is placed on the right side of the flame of the gas stove. The airbag 6 is a double-layer high-temperature resistant silicone airbag (thickness 1.5 mm), with metal shells on both sides of the airbag 6. The airbag 6 is filled with ethanol (80% by volume).

[0031] The heat pipe 5 has a copper inner shell and ammonia as the working fluid. It has an evaporation section and a condensation section at either end. The evaporation section is connected to the heat transfer block 3, and the condensation section is connected to the air bag 6. The heat pipe 5 is 300 mm long, with the evaporation section being 50 mm long and the condensation section being 200 mm long.

[0032] One side of the airbag 6 is connected to a mechanical adjustment module, which consists of a valve stem 7, a butterfly valve 8 (electric actuator stroke 0-20mm), and a spring 9. The valve stem 7 is chrome-plated (roughness Ra 0.2μm) and has a built-in linear bearing. The end of the spring 9 is connected to the gas regulating valve 10. The spring 9 is made of stainless steel and has an adjustable preload range of 50-200N.

[0033] During use, the flame generated by the burner 1 of the gas stove absorbs heat from the evaporation section of the heat pipe 5, which then vaporizes the ammonia working medium. The vapor is quickly transferred to the condensation section of the heat pipe 5, heating the ethanol in the air bag 6. The ethanol then expands, pushing the piston of the valve stem 7 to move. The piston then moves in conjunction with the mechanical adjustment module.

[0034] The specific mechanical adjustment is as follows: ethanol expands due to heat, pushing the piston and compressing the spring, which in turn shifts the valve stem, which in turn reduces the butterfly valve opening and gas flow. The dynamic balance between the airbag expansion force and the spring force causes the opening of the gas stove regulating valve 10 to change linearly with the thermal expansion force.

[0035] The safety control module includes a hydrogen concentration sensor 4, which is integrated into the gas line interface. This sensor is connected to an emergency shutoff valve 11 via a separate signal line. The actuating end of the emergency shutoff valve 11 is located within the main gas line 2. When the hydrogen concentration sensor 4 detects a hydrogen concentration ≥ 0.4%, it triggers a signal to depressurize the shutoff valve, causing the valve spring to reset. This activates the emergency shutoff valve 11, closing the main gas line 2.

[0036] The gas stove is packaged as a whole, with the heat pipe 5, air bag 6 and valve using an integrated housing. The installation space requirement is ≤ 0.15m 3 (Traditional split type ≥0.5m 3 ), mass production costs are reduced by 50% (500 yuan for the basic plan, +1,000 yuan for electronic control upgrade).

[0037] At the same time, the heat transfer response time is ≤3 seconds (traditional metal components ≥10 seconds).

[0038] Expansion force linearity error ≤ 5% (metal components ≥ 15%).

[0039] Flow regulation linearity error ≤ 5% (traditional structure ≥ 20%).

[0040] Friction force fluctuation ≤3% at high temperature.

[0041] Flow regulation linearity error ≤ 5% (traditional structure ≥ 20%).

[0042] Friction force fluctuation ≤3% at high temperature.

[0043] The process flow and parameters are as follows:

[0044] 1. Heat pipe manufacturing process

[0045] step:

[0046] Copper tube cleaning (ultrasonic degreasing) → working fluid injection (ammonia, purity ≥99.9%) → vacuum packaging (vacuum degree ≤10-3Pa).

[0047] Bending (bending radius ≥ 3 times the pipe diameter) → high temperature resistant coating (polytetrafluoroethylene, thickness 50μm).

[0048] parameter:

[0049] Operating temperature range: -50℃ to 200℃.

[0050] Thermal conductivity: ≥5000W / m·K.

[0051] 2. Airbag vulcanization molding

[0052] step:

[0053] Silicone mixing (adding heat-resistant additives, vulcanizing agent dosage 1.5%) → mold calendering (temperature 170°C, pressure 10 MPa, time 300 seconds).

[0054] Fill with ethanol (80% by volume) → Seal test (maintain pressure 0.5 MPa, leakage rate ≤ 0.1 mL / min).

[0055] parameter:

[0056] Temperature resistance: -40℃ to 180℃.

[0057] Expansion life: ≥10 6 Second cycle (1-2 years replacement cycle).

[0058] 3. Valve assembly and calibration

[0059] step:

[0060] The valve stem 7 is chrome-plated (thickness 20 μm) → linear bearing press-fit (interference 0.02 mm).

[0061] Spring 9 preload calibration (pressure sensor feedback, error ≤ 2%) → valve opening-expansion force curve fitting (R 2 ≥0.99).

[0062] parameter:

[0063] Valve stem 7 stroke: 0-20mm (corresponding to flow rate 0-100%).

[0064] Repeat positioning accuracy: ±0.1mm.

[0065] Example 2: Advanced electronically controlled gas flow regulation system

[0066] 1) The structure is as follows

[0067] Thermal acquisition module:

[0068] Heat pipe: copper-water working medium (thermal conductivity 5000W / m·K), length 400mm.

[0069] Electronic Control Module:

[0070] Temperature sensor: PT100 type (detection range 0-300℃), installed at the condensation end of the heat pipe.

[0071] Microcontroller: STM32F103 series, preset expansion force-opening mapping table.

[0072] Mechanical execution module:

[0073] Ball valve: pneumatic actuator (pressure range 0.2-0.8MPa), sealing material is fluororubber.

[0074] 2) Working Principle

[0075] Closed-loop control:

[0076] The temperature sensor monitors the airbag area temperature in real time → the microcontroller calculates the theoretical expansion force → outputs a PWM signal to control the pneumatic actuator → adjusts the ball valve opening.

[0077] 3) Adaptive Optimization:

[0078] The system dynamically corrects the expansion force-opening curve based on historical data (such as fluctuations in the calorific value of gas) to improve regulation accuracy.

[0079] 4) Function and effect

[0080] Regulation accuracy: flow error ≤ ±2% (pure mechanical solution is ±5%).

[0081] Extended functions: support remote monitoring (via WiFi module) and abnormal status alarm.

[0082] Cost: The total cost is about 2,500 yuan (including electronic components).

[0083] Example 3: Ammonia Mixture Special Safety Optimization System

[0084] 1) The structure is as follows

[0085] Thermal Module:

[0086] Airbag filling fluid: nitrogen (expansion coefficient 0.00366 / ℃) + ethanol (double fluid mixture).

[0087] Security Module:

[0088] Double-layer sealing design: fluororubber (outer layer) + polyimide (inner layer, hydrogen permeability ≤ 1×10 -9 cc / cm 2 ·s).

[0089] Redundant shut-off valve: Dual pneumatic valves in parallel, failure probability ≤ 0.001%.

[0090] 2) Working Principle

[0091] Duplex expansion:

[0092] Nitrogen provides fast response (low heat capacity), and ethanol enhances expansion force (high volume expansion coefficient). The two work together to improve the linearity of regulation.

[0093] Redundant safety:

[0094] When the main shut-off valve fails, the backup valve is triggered through an independent air circuit, ensuring that the leakage risk is close to zero.

[0095] 3) Function and effect

[0096] Hydrogen compatibility: Suitable for mixed gases with a hydrogen ratio of ≤30%, and a leakage rate of ≤0.001ppm / h.

[0097] Reliability: MTBF (mean time between failures) ≥ 100,000 hours.

[0098] Example 4: Low-cost home modular system

[0099] 1) The structure is as follows

[0100] Integrated modules:

[0101] Heat pipe-air bag-butterfly valve integrated package (size 150×100×80mm), the shell is high temperature resistant ABS plastic.

[0102] Simplified security module:

[0103] Mechanical overpressure relief valve (threshold 0.5MPa), without electronic sensor.

[0104] 2) Working Principle

[0105] Pure mechanical feedback: The valve is directly driven by thermal expansion force, and the relief valve opens automatically when overpressure occurs.

[0106] 3) Function and effect

[0107] Cost: Mass production cost ≤ 500 yuan.

[0108] Applicable scenarios: low-risk natural gas environment (hydrogen ratio ≤ 5%).

[0109] The core features, costs, and applicable scenarios of the above four embodiments are shown in Table 1.

[0110] Table 1 Core features, costs, and applicable scenarios of the four embodiments

[0111] Example Core Features Cost (yuan) Applicable Scenarios Example 1 (Basic Machinery) Heat pipe-airbag fast response 500-1500 Household gas stove (general purpose) Embodiment 2 (Electronic Control) High-precision closed-loop regulation 1500-3000 Industrial gas equipment Example 3 (Hydrogen Mixture) Duplex medium + redundant safety 2000-4000 Hydrogen / natural gas mixture scenario Example 4 (low cost) Modular pure mechanical design ≤500 Low-risk family environment

[0112] Therefore, the present invention adopts the above-mentioned mechanical gas stove based on a mixture of natural gas and hydrogen. Without the need for electronic control, it takes mechanical thermal drive as the core to achieve low-cost, high-response, and high-safety adaptive adjustment of gas flow, which is suitable for the stringent scenario requirements of household gas equipment.

[0113] It is worth noting that the contents not elaborated in detail in the present invention are all prior art and are well known to those skilled in the art.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A mechanical gas stove based on a mixture of natural gas and hydrogen, characterized by: It includes a heat collection module and a safety control module. The heat collection module includes a heat conduction block, which is connected to the airbag through a heat pipe. One side of the airbag is connected to a mechanical adjustment module, which includes a valve stem, a butterfly valve and a spring connected in sequence.

2. A mechanical gas stove based on a mixture of natural gas and hydrogen according to claim 1, characterized in that: The heat conduction block is placed on the right side of the flame of the gas stove. The airbag is a double-layer high-temperature resistant silica gel airbag. Metal shells are provided on both sides of the airbag. The airbag is filled with ethanol or nitrogen.

3. The mechanical gas stove based on a mixture of natural gas and hydrogen according to claim 1, characterized in that: The inner wall of the heat pipe is a copper shell, the internal working fluid of the heat pipe is ammonia, the two ends of the heat pipe are respectively an evaporation section and a condensation section, the evaporation section is connected to the heat conduction block, and the condensation section is connected to the air bag.

4. The mechanical gas stove based on a mixture of natural gas and hydrogen according to claim 3, characterized in that: The length of the evaporation section is 50 mm, and the length of the condensation section is 200 mm.

5. The mechanical gas stove based on a mixture of natural gas and hydrogen according to claim 1, characterized in that: The valve stem is chrome-plated and has a built-in linear bearing.

6. The mechanical gas stove based on a mixture of natural gas and hydrogen according to claim 1, characterized in that: The end of the spring is connected to the gas regulating valve. The spring is made of stainless steel and has a preload adjustment range of 50-200N.

7. The mechanical gas stove based on a mixture of natural gas and hydrogen according to claim 1, characterized in that: The safety control module includes a hydrogen concentration sensor, which is connected to an emergency shut-off valve via a separate signal line. The actuating end of the emergency shut-off valve is placed in the main gas line.

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