Low-power-consumption closed space hydrogen measuring device

Abstract

The invention relates to the technical field of hydrogen measuring devices, in particular to a low-power-consumption closed space hydrogen measuring device. The device comprises an upper protective shell, wherein a lower protective shell and the upper protective shell form a protective shell; the sampling tube is arranged at the upper part of the inner side of the upper protective shell; two ventilation interfaces are formed in the top of the hydrogen sensitive assembly, and the hydrogen sensitive assembly is mounted at the bottom of the sampling tube through the ventilation interfaces; the aviation plug is installed on the outer side of the top of the upper protective shell. The data processing module is installed on the inner side of the bottom of the lower protective shell. The connecting circuit is used for connecting the data processing module with the aviation plug and connecting the data processing module with the hydrogen sensitive assembly. The hydrogen concentration is measured by adopting a catalytic combination principle, hydrogen and oxygen in gas in a closed space are subjected to catalytic combination reaction at normal temperature under the action of a catalyst, power supply for heating is not needed, and the energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of hydrogen measurement device technology, and more specifically, to a low-power, enclosed space hydrogen measurement device. Background Technology

[0002] Special confined spaces, such as aviation or aerospace environments, require continuous monitoring of hydrogen concentration due to the complex operating conditions of manned spacecraft or airborne equipment and their long-term operational needs. This is to ensure the operating environment of the spacecraft and the survival environment of the astronauts, and to avoid hydrogen risks. This places higher demands on the power consumption and safety indicators of hydrogen measurement devices.

[0003] Currently, hydrogen concentration measurements in space stations or aerospace environments utilize thermoelectric catalysis-based hydrogen sensors. The principle involves hydrogen reacting with oxygen in the air under the influence of catalytic metals such as palladium or platinum, generating heat of reaction (heat of flameless catalytic combustion), which is related to the hydrogen concentration. The sensors use palladium as the catalyst, requiring heating. The reaction temperature reaches as high as 500 degrees Celsius, necessitating significant power consumption and a large size for the measuring device. Furthermore, the high temperature necessitates heating, which reduces safety during operation. Therefore, improvements are urgently needed. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a low-power, enclosed-space hydrogen measurement device. This solves the problems of the measurement device requiring high power consumption and large size, and the safety issues arising from the need for heating and high temperatures.

[0005] To achieve the above and other related objectives, the present invention provides a low-power, confined space hydrogen measurement device, comprising: Upper protective shell; and, The lower protective shell, together with the upper protective shell, constitutes a protective shell; A sampling tube is disposed on the upper part of the inner side of the upper protective housing; A hydrogen-sensitive component has two vent ports on its top and is installed at the bottom of the sampling tube through the vent ports; An aviation connector, which is mounted on the top outer side of the upper protective housing; The data processing module is installed on the inner side of the bottom of the lower protective housing; Connection lines for connecting the data processing module and the aviation plug, and for connecting the data processing module and the hydrogen-sensitive component.

[0006] In one embodiment of the present invention, it further includes: The catalyst sensing element is fixed inside the hydrogen sensing component by a shock-absorbing pad. A first thermistor is inserted inside the catalytic sensing element to measure the exothermic temperature of the catalyst reaction. A second thermistor is inserted inside the hydrogen sensing component to measure the intake air temperature.

[0007] In one embodiment of the present invention, the connection line includes: A first connection line is used to connect the data processing module and the aviation plug; The second connection line is used to connect the data processing module and the second thermal element; The third connection line is used to connect the data processing module and the first thermal element.

[0008] In one embodiment of the present invention, it further includes: A flow control bolt is installed inside the sampling tube.

[0009] In one embodiment of the present invention, the first thermistor is a thermocouple or a platinum resistance temperature sensing element, and the diameter of the first thermistor is 2 to 6 mm; the second thermistor is a thermocouple or a platinum resistance temperature sensing element, and the diameter of the second thermistor is 2 to 6 mm.

[0010] In one embodiment of the present invention, the catalytic sensing element includes a catalyst for reacting hydrogen and oxygen at room temperature.

[0011] In one embodiment of the present invention, both the upper protective shell and the lower protective shell are semi-box structures.

[0012] In one embodiment of the present invention, the flow control bolt is a hollow bolt structure.

[0013] In one embodiment of the present invention, the data processing module includes a microcontroller, a digital-to-analog converter, a power supply module, and a connector.

[0014] In one embodiment of the present invention, the first connection line is a communication and power cable, and the second and third connection lines are dedicated cables for thermal elements.

[0015] As described above, the low-power, enclosed-space hydrogen measurement device of the present invention has the following beneficial effects: The present invention discloses a low-power closed-space hydrogen measurement device that uses the principle of catalytic combination to measure hydrogen concentration. Under the action of a catalyst, hydrogen and oxygen in the gas in the closed space undergo a catalytic combination reaction at room temperature, without the need for power supply for heating, thus reducing energy consumption.

[0016] The present invention provides a low-power, enclosed space hydrogen measurement device that avoids combustion and explosion under high hydrogen concentration conditions by not using power to heat the hydrogen-containing gas, thus ensuring safe and reliable operation.

[0017] The present invention provides a low-power hydrogen measurement device for a confined space. By measuring temperature changes, the hydrogen concentration is calculated using a temperature rise algorithm. It does not require traditional Wheatstone bridge hardware circuitry, so the device is small in size and light in weight. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a low-power, enclosed space hydrogen measurement device according to an embodiment of the present invention. Figure 2 This is a flowchart illustrating the operation of a low-power, enclosed space hydrogen measurement device according to an embodiment of the present invention.

[0019] Wherein: 1-Upper protective shell, 2-Lower protective shell, 3-Hydrogen sensitive component, 4-Catalyst sensitive element, 5-Shock-absorbing pad, 6-First thermistor, 7-Second thermistor, 8-Sampling tube, 9-Flow control bolt, 10-Aviation plug, 11-Data processing module, 12-First connection line, 13-Second connection line, 14-Third connection line. Detailed Implementation

[0020] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0022] Terms such as "first" or "second" may be used to describe various components, but these components are not limited by the terms described above. The terms described above are used to distinguish one component from another; for example, without departing from the scope of the concept according to this disclosure, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

[0023] Furthermore, "connected / linked" indicates that one component is directly electrically connected to another component or indirectly electrically connected through another component. Unless otherwise explicitly stated in the sentence, the singular form may include the plural form. Additionally, the terms "comprising / including" or "containing / including" as used in this specification indicate the presence or addition of one or more components, steps, operations, and elements. Specific structural or functional descriptions of examples of embodiments of the concepts disclosed in this specification are merely illustrative to describe examples of embodiments of the concepts, and examples of embodiments of the concepts can be implemented in various forms, but these descriptions are not limited to the examples of embodiments described in this specification.

[0024] Based on the concept, various modifications and changes can be applied to examples of embodiments, such that examples of embodiments will be illustrated in the accompanying drawings and described in the specification. However, examples of embodiments based on the concept are not limited to specific embodiments, but include all changes, equivalents, or substitutions included within the spirit and scope of this disclosure.

[0025] It should be understood that when describing an element as "connected" or "linked" to another element, the element may be directly connected or linked to the other element, or it may be connected or linked to the other element via a third element. Conversely, it should be understood that when an element is described as "directly connected to" or "directly linked to" another element, no other element is placed between them. Other expressions describing relationships between components (i.e., "between" and "directly between" or "adjacent to" and "directly adjacent to") need to be interpreted in the same way.

[0026] The terminology used in this specification is for the purpose of describing specific examples of implementations only and is not intended to limit this disclosure. The singular form may include the plural form unless there is an explicit contrary meaning in the context. It should be understood in this specification that the terms "comprising" or "having" indicate the presence of the features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0027] Unless otherwise defined, all terms used herein (including technical or scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art. If a term is not clearly defined in a common dictionary in this specification, it shall be interpreted as having the same meaning as in the context of the relevant art, and not as an ideal or overly formal meaning.

[0028] Descriptions of known components and processing techniques may be omitted to avoid unnecessarily obscuring the embodiments of this disclosure.

[0029] Throughout this specification, the same reference numerals refer to the same elements. Therefore, even if a reference numeral is not mentioned or described with reference to one drawing, it may be mentioned or described with reference to another drawing. Furthermore, even if a reference numeral is not shown in one drawing, it may be mentioned or described with reference to another drawing.

[0030] Additionally, the logic level of a signal may be different from or opposite to the logic level described. For example, a signal described as having a logic "high" level may optionally have a logic "low" level, and a signal described as having a logic "low" level may optionally have a logic "high" level.

[0031] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0032] The present invention discloses a low-power, enclosed-space hydrogen measurement device, comprising an upper protective shell 1, a lower protective shell 2, a hydrogen sensing component 3, a catalytic sensing element 4, a shock-absorbing pad 5, a first thermistor 6, a second thermistor 7, a sampling tube 8, a flow control bolt 9, an aviation plug 10, a data processing module 11, a first connection line 12, a second connection line 13, and a third connection line 14. The upper and lower protective shells 1 and 2 constitute the protective shell. The sampling tube 8 is disposed on the upper inner side of the upper protective shell 1. The hydrogen sensing component 3 has two vent ports on its top and is installed at the bottom of the sampling tube 8 through the vent ports. The aviation plug 10 is installed on the outer top of the upper protective shell 1. The data processing module 11 is installed on the inner bottom of the lower protective shell 2. The catalytic sensing element 4 is fixed inside the hydrogen sensing component 3 by the shock-absorbing pad 5. The first thermistor 6 is inserted inside the catalytic sensing element 4 for measuring the exothermic temperature of the catalyst reaction. The second thermistor 7 is inserted inside the hydrogen sensing component 3 for measuring the inlet temperature. The first connecting line 12 is used to connect the data processing module 11 and the aviation plug 10; the second connecting line 13 is used to connect the data processing module 11 and the second thermal element 7; the third connecting line 14 is used to connect the data processing module 11 and the first thermal element 6; the flow control bolt 9 is installed inside the sampling tube 8.

[0033] The present invention provides a low-power, enclosed space hydrogen measurement device that uses the principle of room-temperature catalytic combination. The hydrogen oxidation reaction is an exothermic process. Based on the temperature change of the gas before and after catalysis, the hydrogen concentration is calculated by a program. The device has low power consumption, high safety, and small size.

[0034] The hydrogen measuring device for a confined space involved in this invention mainly comprises the following parts: 1) Gas sampling section: Gas is sampled from the ambient space, and the gas returns to the ambient space after passing through the hydrogen measuring element; 2) Hydrogen measuring element: Composed of a metal structure with a built-in hydrogen catalyst and a temperature measuring element. The catalyst causes an exothermic chemical reaction between hydrogen and oxygen at room temperature, and the temperature change of the sampled gas before and after passing through the catalyst measuring element is measured. The temperature measuring element measures the temperature T1 of the gas before passing through the hydrogen measuring element and the temperature T2 of the gas after passing through the measuring element. 3) Measurement Signal Analysis and Processing Unit: Employing a microprocessor or programmable controller, the unit calculates the hydrogen concentration from temperature measurement signals T1 and T2 using a program algorithm. The algorithm is as follows: , Where AT is the temperature rise of the combination reaction; K is the characterization parameter, with a value of 30 to 80; the value of K is a reasonable value obtained after conducting a large number of experiments on the combination reaction of hydrogen and oxygen.

[0035] In one embodiment of the present invention, the catalytic sensing element 4 is similar to a grid-sintered catalyst, which is fixed inside by a shock-absorbing pad 5. The first thermistor 6 is inserted into the catalyst to transfer the heat released by the catalyst reaction. The second thermistor 7 is inserted into the air intake pipe to measure the air intake temperature. The difference between the two temperatures is converted to obtain the corresponding hydrogen concentration value.

[0036] In one embodiment of the present invention, the flow control bolt 9 is similar to a flow regulating valve, which can adjust the flow rate of the main pipeline by turning the knob screw. For example, if the flow rate at the inlet of the sampling tube 8 is 20 L / min, and the gas flows directly into the measuring pipeline at a rate of 5 L / min, then the flow rate at the sampling tube 8 through the flow control bolt is 15 L / min. If the knob of the bolt is adjusted, the flow rate through the flow control bolt can be reduced to 10 L / min, and the flow rate entering the measuring pipeline is also 10 L / min. The main function of this setting is to adjust the flow rate of the measuring pipeline to ensure measurement accuracy.

[0037] Specifically, the first thermistor 6 is a thermocouple or platinum resistance temperature sensing element, and the diameter of the first thermistor 6 is 2-6 mm; the second thermistor 7 is a thermocouple or platinum resistance temperature sensing element, and the diameter of the second thermistor 7 is 2-6 mm.

[0038] Specifically, the catalytic sensing element 4 includes a catalyst, which is used to cause hydrogen and oxygen to react at room temperature.

[0039] Specifically, both the upper protective shell 1 and the lower protective shell 2 are semi-box structures. When installed together, the two shells protect the rest of the sensor.

[0040] Specifically, the flow control bolt 9 is a hollow bolt structure. The airflow and velocity in the main circuit and the measurement circuit can be controlled by adjusting the size of the internal hole.

[0041] Specifically, the data processing module 11 includes a microcontroller, a digital-to-analog converter, a power supply module, and a connector. Power consumption is less than 25W.

[0042] Specifically, the first connection line 12 is a communication and power cable, and the second connection line 13 and the third connection line 14 are dedicated cables for thermistors.

[0043] Specifically, the aviation plug 10 is a dedicated quick electrical connector for aircraft, which can supply power and transmit signals to the system.

[0044] In one embodiment of the present invention, the sampling tube 8 includes a flow control bolt 9 inside, the two ends of the flow control bolt 9 are external interfaces, which are connected by compression fittings or quick connectors; the bottom of the flow control bolt 9 has two internal interfaces for connecting the hydrogen sensing component 3.

[0045] In one embodiment of the present invention, all components except the catalyst sensing element 4, the first thermosensitive element 6, the second thermosensitive element 7, the data processing module 11, the first connection line 12, the second connection line 13, and the third connection line 14 are made of titanium alloy, stainless steel, or aluminum alloy.

[0046] The low-power, sealed-space hydrogen measurement device of the present invention mainly measures hydrogen as follows: The gas enters the catalytic sensing element 4 through the air inlet in the sampling tube 8. The first thermistor 6 and the second thermistor 7 transmit the measured temperature signal to the data processing module 11. The data processing module 11 completes signal acquisition and program calculation, and uses an algorithm to calculate the hydrogen concentration based on the temperature measurement value.

[0047] The core material of the catalytic sensing element 4 is a palladium-platinum alloy catalyst (PdPt / Al2O3). The catalyst is in the form of small spheres, with a diameter of 1-2 mm. It can produce a highly efficient catalytic effect on the hydrogen-oxygen recombination reaction at room temperature without external heating, enabling the rapid combination of hydrogen and oxygen in the sample gas. The hydrogen-oxygen recombination reaction is an exothermic reaction; the higher the H2 concentration in the air, the more heat is generated. The heat of reaction causes a change in the output of the sensing element within the hydrogen sensor, and the hydrogen concentration is analyzed through the output signal of the sensing element.

[0048] The thermal reaction equation is as follows:

[0049] The catalyst uses Al2O3 spherical particles as a support, which has high mechanical strength.

[0050] In summary, this low-power, confined-space hydrogen measurement device uses the principle of catalytic combination to measure hydrogen concentration. Under the action of a catalyst, hydrogen and oxygen in the gas within the confined space undergo a catalytic combination reaction at room temperature, eliminating the need for power supply heating and reducing energy consumption. Since no power supply is used to heat the hydrogen-containing gas, potential combustion and explosion under high hydrogen concentration conditions are avoided, ensuring safe and reliable operation. This invention calculates hydrogen concentration by measuring temperature changes and employing a temperature rise algorithm, eliminating the need for traditional Wheatstone bridge hardware circuitry, resulting in a small and lightweight device.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A low-power, sealed-space hydrogen measurement device, characterized in that, include: Upper protective shell (1); as well as, The lower protective shell (2) together with the upper protective shell (1) constitutes a protective shell; Sampling tube (8) is disposed on the upper part of the inner side of the upper protective shell (1); The hydrogen-sensitive component (3) has two ventilation ports on its top and is installed at the bottom of the sampling tube (8) through the ventilation ports; Aviation plug (10), which is mounted on the top outside of the upper protective housing (1); The data processing module (11) is installed on the inner bottom of the lower protective housing (2); Connection lines for connecting the data processing module (11) and the aviation plug (10), and for connecting the data processing module (11) and the hydrogen sensing component (3).

2. The low-power, sealed-space hydrogen measurement device according to claim 1, characterized in that, Also includes: The catalyst sensing element (4) is fixed inside the hydrogen sensing component (3) by a shock-absorbing pad (5); The first thermistor (6) is inserted inside the catalytic sensing element (4) and is used to measure the exothermic temperature of the catalyst reaction. The second thermistor (7) is inserted inside the hydrogen sensing component (3) for measuring the intake temperature.

3. The low-power, sealed-space hydrogen measurement device according to claim 2, characterized in that, The connection line includes: A first connection line (12) is used to connect the data processing module (11) and the aviation plug (10). The second connection line (13) is used to connect the data processing module (11) and the second thermal element (7). The third connection line (14) is used to connect the data processing module (11) and the first thermal element (6).

4. The low-power, sealed-space hydrogen measuring device according to claim 1, characterized in that, Also includes: A flow control bolt (9) is installed inside the sampling tube (8).

5. A low-power, sealed-space hydrogen measuring device according to claim 2, characterized in that, The first thermistor (6) is a thermocouple or platinum resistance temperature measuring element, and the diameter of the first thermistor (6) is 2 to 6 mm; the second thermistor (7) is a thermocouple or platinum resistance temperature measuring element, and the diameter of the second thermistor (7) is 2 to 6 mm.

6. A low-power, sealed-space hydrogen measuring device according to claim 2, characterized in that: The catalytic sensing element (4) includes a catalyst, which is used to react hydrogen and oxygen at room temperature.

7. The low-power, sealed-space hydrogen measuring device according to claim 1, characterized in that: Both the upper protective shell (1) and the lower protective shell (2) are semi-box structures.

8. A low-power, sealed-space hydrogen measuring device according to claim 4, characterized in that: The flow control bolt (9) is a hollow bolt structure.

9. A low-power, sealed-space hydrogen measuring device according to claim 1, characterized in that: The data processing module (11) includes a microcontroller, a digital-to-analog converter, a power supply module, and a connector.

10. A low-power, sealed-space hydrogen measuring device according to claim 3, characterized in that: The first connection line (12) is a communication and power cable, and the second connection line (13) and the third connection line (14) are special cables for thermistors.

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