Hydrogen concentration detection device and equipment

Abstract

The invention discloses a hydrogen concentration detection device and equipment capable of preventing engine oil pollution without influencing the performance of a sensor, and the hydrogen concentration detection device comprises a collection end which is arranged in to-be-detected gas; the detection part comprises a detection surface and is used for detecting the hydrogen concentration of the gas in contact with the detection surface; the collecting end is a circular-truncated-cone-shaped pipeline and comprises a gas inlet and a gas outlet, a preset angle is formed between the axis of the circular-truncated-cone-shaped pipeline and the gas flow direction of gas to be detected, the middle of the circular-truncated-cone-shaped pipeline is connected with the communicating part to form a communicating opening, and the circular-truncated-cone-shaped pipeline gradually shrinks in the gas flow direction; the communicating part is used for forming a low-pressure area in which small molecules in the to-be-detected gas are easy to accumulate.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas detection, and in particular relates to a hydrogen concentration detection device and equipment. Background Art

[0002] Existing hydrogen sensors usually use sensitive elements to detect the presence of hydrogen and convert it into electrical signals to complete the detection of hydrogen concentration. However, in industrial applications, hydrogen sensors are often exposed to environments containing oil vapor or other similar environments. At this time, oil vapor or other impurities may contaminate the sensor surface through air suspension or direct contact, thereby affecting its performance.

[0003] The current common solution is to use a physical cover to protect the sensor element. These covers are usually made of oil-proof materials, such as plastic or metal, and sometimes filters or holes are set on the cover to allow gas to pass but block liquid. However, these designs have the following disadvantages:

[0004] 1. The filter or holes may be clogged due to long-term exposure to oil mist, resulting in decreased sensor sensitivity;

[0005] 2. Physical covers may not completely prevent the deposition of oil vapor, especially in environments with high oil mist concentrations;

[0006] 3. The cover may limit the contact area between the sensor and the gas, reducing the interaction between the gas molecules and the sensor, thereby affecting the detection accuracy. Summary of the invention

[0007] In view of this, an object of the present invention is to provide a hydrogen concentration detection device that can prevent oil contamination and does not affect sensor performance.

[0008] A hydrogen concentration detection device provided by the present invention has the following technical features, including: a collection end, which is arranged in the gas to be detected; a detection part, which includes a detection surface, which is used to detect the hydrogen concentration of the gas in contact with the detection surface; and a connecting part, which is used to connect the collection end with the detection surface, wherein the collection end is a truncated cone-shaped pipeline, including an air inlet and an air outlet, the axis of the truncated cone-shaped pipeline is at a predetermined angle to the airflow direction of the gas to be detected, the middle part of the truncated cone-shaped pipeline is connected to the connecting part to form a connecting port, the truncated cone-shaped pipeline gradually shrinks along the airflow direction, so that the flow rate of the gas to be detected gradually increases, and the connecting part is used to form a low-pressure area that is easy to accumulate small molecules in the gas to be detected.

[0009] Furthermore, the hydrogen concentration detection device provided by the present invention may also have such a technical feature that the axial lengths of the gas inlet, the gas outlet and the truncated cone-shaped pipe meet the following requirements:

[0010]

[0011] Among them, d 1 is the diameter of the air inlet, d 2 is the diameter of the air outlet, l 1 is the axial length of the truncated cone pipe.

[0012] Furthermore, the hydrogen concentration detection device provided by the present invention may also have such a technical feature that the sizes of the gas inlet, the gas outlet, the communication port and the truncated cone-shaped pipe are designed according to a first predetermined ratio, and the first predetermined ratio is expressed as:

[0013]

[0014] and:

[0015]

[0016] Among them, d 3 The diameter of the connecting port, a is the preset coefficient.

[0017] Furthermore, the hydrogen concentration detection device provided by the present invention may also have such a technical feature that the angle between the axis of the truncated cone-shaped pipeline and the gas flow direction of the gas to be measured is 30°±15°, and

[0018]

[0019] Wherein, ∠B is the angle between the axis of the truncated cone-shaped pipe and the airflow direction of the gas to be measured.

[0020] Furthermore, the hydrogen concentration detection device provided by the present invention may also have such a technical feature that the connecting portion is a cylindrical pipe, and the length of the cylindrical pipe and the truncated cone pipe are designed according to the following length ratio:

[0021]

[0022] Among them, l 1 is the axial length of the truncated cone pipe, l 2 is the length of the cylindrical pipe between the detection surface and the truncated cone pipe, d 1 is the diameter of the air inlet, d 2 is the diameter of the air outlet, d 3 The diameter of the connecting port.

[0023] Furthermore, the hydrogen concentration detection device provided by the present invention may also have such a technical feature that the intersection of the axis of the cylindrical pipe and the axis of the truncated cone pipe divides the axis of the truncated cone pipe into a first axis segment t 1 and the second axis segment t 2 ,in:

[0024]

[0025] Furthermore, the hydrogen concentration detection device provided by the present invention may also have such a technical feature that the angle between the cylindrical pipe, the truncated cone pipe and the airflow direction is designed according to a second predetermined ratio, and the second predetermined ratio is expressed as:

[0026]

[0027] Among them, ∠A is the angle between the axis of the cylindrical pipe and the axis of the truncated cone pipe, ∠B is the angle between the axis of the truncated cone pipe and the airflow direction of the gas to be measured, and b is a preset coefficient.

[0028] Furthermore, the hydrogen concentration detection device provided by the present invention may also have such technical features, and further include:

[0029] The fixing part is used to fix the collecting end to the gas container, and the horizontal cross section of the collecting end is covered by the horizontal cross section of the fixing part.

[0030] Furthermore, the hydrogen concentration detection device provided by the present invention may also have such a technical feature, wherein the material of the collection end and the connecting part is any one or more of stainless steel, polyetheretherketone, polytetrafluoroethylene, polyimide, titanium alloy, ceramic material, carbon fiber reinforced plastic, and glass fiber reinforced plastic.

[0031] The present invention also provides a hydrogen concentration detection device having such technical features, comprising: any one of the above hydrogen concentration detection devices; and a controller electrically connected to the detection part of the hydrogen concentration detection device. .

[0032] Function and Effect of the Invention

[0033] According to the hydrogen concentration detection device provided by the present invention, since the collection end is designed as a truncated cone-shaped pipeline, the truncated cone-shaped pipeline shrinks along the airflow direction, and is connected to the connecting part in the middle of the truncated cone-shaped pipeline to form a connecting port, when the gas to be tested flows along the truncated cone-shaped pipeline, the flow rate gradually increases, the pressure gradually decreases, and a low-pressure area is formed in the connecting part, so large-particle pollutants are easily directly discharged from the truncated cone-shaped pipeline along with the airflow, while small-particle gas molecules will accumulate in the low-pressure area and be detected by the detection part arranged in the connecting part. Through the above means, the deposition of pollutants on the surface of the hydrogen sensor probe can be reduced or avoided.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the drawings required for use in the specific implementation or the description of the prior art will be briefly introduced below.

[0036] Figure 1 This is one of the structural schematic diagrams of the hydrogen concentration detection device provided in Example 1 of the present invention.

[0037] Figure 2 This is a second structural schematic diagram of the hydrogen concentration detection device provided in Example 1 of the present invention.

[0038] Figure 3 This is a bottom view of the hydrogen concentration detection device provided in Example 1 of the present invention.

[0039] Figure 4 for Figure 3 AA section view.

[0040] Figure 5 This is an enlarged cross-sectional view of the connecting portion and the collecting end provided in the first embodiment of the present invention.

[0041] Figure 6 This is a comparison chart of the detection results of the hydrogen concentration detection device provided in Example 1 of the present invention.

[0042] Figure 7 This is a schematic diagram of the structure of a hydrogen concentration detection device provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the order used in this way can be interchanged where appropriate, so that the embodiments of the invention described herein can be implemented in an order other than those illustrated or described herein.

[0045] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0046] <Example 1>

[0047] refer to Figure 1 , Figure 2 and Figure 3 The hydrogen concentration detection device 10 includes a fixing portion 11, a detection portion 12, a connecting portion 13 and a collection end 14 which are connected in sequence.

[0048] The fixing part 11 is used to fix the hydrogen concentration detection device 10 to the container of the gas to be detected, so that the collection end 14 can collect the gas to be detected, and ensure the sealing performance between the container probe cover and the hydrogen concentration detection device 10, ensuring that the gas can only enter through the channel in the probe cover.

[0049] In this embodiment, the hydrogen concentration detection device 10 is used to detect the hydrogen concentration in the engine exhaust pipe. The fixing part 11 is a threaded structure equipped with a sealing ring, and the collection end 14 is fixed to the exhaust pipe through a mounting hole provided on the exhaust pipe.

[0050] In addition, in actual application, the hydrogen concentration detection device 10 also includes a controller, and a wiring harness duct is also provided at one end of the fixing portion 11 away from the detection portion 12, through which the controller is electrically connected to the detection portion 12, forming a complete set of hydrogen concentration detection equipment. The wiring harness duct and the controller are not the focus of innovation of this solution, so they are not described in detail.

[0051] The detection unit 12 is used to complete the detection of hydrogen concentration and feed back the corresponding voltage signal to the controller.

[0052] In this embodiment, reference Figure 4 The detection unit 12 includes a detection surface 121 and a detection chip 122, which can detect the hydrogen concentration of the gas in contact with the detection surface 121. The output signal of the detection unit 12 is an analog signal of 0.5V to 4.5V, corresponding to a hydrogen concentration detection range of 0% to 4%. The detection method of the detection unit 12 is thermal conductivity detection, which is a conventional method and is therefore not described in detail.

[0053] The connecting portion 13 is used to connect the collection end 14 with the detection surface 121, so that the gas to be tested can contact the detection surface 121 when it flows into the collection end 14, thereby completing the detection of hydrogen concentration. The connecting portion 13 of this embodiment is a cylindrical pipe, and the detection surface 121 is arranged perpendicular to the cylindrical pipe to form a circular detection surface.

[0054] The collection end 14 is disposed in the gas to be measured and is used to collect the gas to be measured.

[0055] In this embodiment, the materials of the collecting end 14 and the connecting part 13 are any one or more of stainless steel, polyetheretherketone, polytetrafluoroethylene, polyimide, titanium alloy, ceramic material, carbon fiber reinforced plastic, and glass fiber reinforced plastic to reduce corrosion caused by working in an oil and gas environment.

[0056] In particular, in order to prevent oil, water vapor and other macromolecular substances from contaminating the detection surface 121 and causing a decrease in detection accuracy, this embodiment sets the collection end 14 as a truncated cone-shaped pipe, and adjusts the angle and size appropriately so that the collection end 14 cooperates with the connecting portion 13 to form a self-cleaning airflow channel, thereby reducing or avoiding the deposition of pollutants on the surface of the hydrogen sensor probe. Figure 4 and Figure 5 The specific structural design of the collection end 14 and the connecting part 13 is as follows:

[0057] The truncated cone-shaped pipe of the collecting end 14 is formed with an air inlet 141 and an air outlet 142, and is arranged along the air flow direction (i.e. Figure 5 The air inlet 141 is gradually and evenly contracted in the S direction, so that the area of ​​the air inlet 141 is larger than that of the air outlet 142. The middle part of the truncated cone-shaped pipe is connected to the cylindrical pipe of the connecting part 13 to form a connecting port 143.

[0058] As an implementation form, refer to Figure 5 , the axial lengths of the air inlet 141, the air outlet 142 and the truncated cone-shaped pipe satisfy:

[0059]

[0060] Among them, d 1 is the diameter of the air inlet, d 2 is the diameter of the air outlet, l 1 is the axial length of the truncated cone-shaped pipe.

[0061] At the same time, the angle between the axis of the truncated cone pipe and the airflow direction of the gas to be measured is 30°±15°, and

[0062]

[0063] Wherein, ∠B is the angle between the axis of the truncated cone-shaped pipe and the airflow direction of the gas to be measured.

[0064] Through the restrictions of the above two formulas, the contraction ratio of the truncated cone-shaped pipe and its angle with the airflow direction can be determined. When the angle remains unchanged, the smaller the contraction ratio, the smaller the angle between the airflow in the truncated cone-shaped pipe and the contact surface of the pipe; when the contraction ratio remains unchanged, the smaller the angle, the smaller the angle between the airflow in the truncated cone-shaped pipe and the contact surface of the pipe. Therefore, after completing the above restrictions, it can be ensured that the airflow and the bottom surface of the truncated cone-shaped pipe always maintain a certain angle, so that the airflow will be blown into the connecting portion 13 and contact the detection surface 121 for detection.

[0065] Furthermore, the sizes of the air inlet 141, the air outlet 142, the communication port 143 and the truncated cone-shaped pipe are designed according to a first predetermined ratio, which is expressed as:

[0066]

[0067] and:

[0068]

[0069] Among them, d 1 is the diameter of the air inlet 141, d 2 is the diameter of the gas outlet 142, d 3 is the diameter of the communication port 143, l 1 is the axial length of the truncated cone-shaped pipeline, and a is a preset coefficient. In this embodiment, the value range of a is between 1.2 and 1.6.

[0070] Through the above-mentioned first predetermined ratio, the flow rate of the gas to be tested can be gradually increased when passing through the truncated cone-shaped pipe to a degree that a low-pressure area of ​​a certain scale can be formed in the connecting part (i.e., a Venturi effect is produced), so that large molecular substances such as oil, water vapor, etc. with a large mass are not easy to enter the connecting part 13, but are directly blown out from the truncated cone-shaped pipe, and finally the effect is that only the gas to be tested is easily accumulated in the low-pressure area and detected by the detection surface 121.

[0071] Preferably, the diameter of the air inlet 141 may be 8.5-9.0 mm, the diameter of the air outlet 142 may be 3.5-4.0 mm, the diameter of the connecting port 143 may be 5.5-6.5 mm, and the axial length of the truncated cone-shaped pipe may be 12-13 mm.

[0072] In addition, in this embodiment, the inner wall of the truncated cone-shaped pipe is designed with a smooth transition, so that the airflow entering the pipe is relatively stable, reducing the possibility of oil particles being brought into the low-pressure area of ​​the connecting portion 13 by turbulence.

[0073] Further, refer to Figure 5 In order to cooperate with the structure of the above-mentioned collecting end 14, the lengths of the cylindrical pipe and the truncated cone pipe of the connecting part 13 are designed according to the following length ratio:

[0074]

[0075] Among them, l 2 It is the length of the cylindrical pipe between the detection surface 121 and the truncated cone-shaped pipe.

[0076] The above-mentioned length ratio design can avoid the problem that the connecting portion 13 is designed to be too long and increase the low-pressure area, resulting in accumulation of the gas to be measured near the detection surface 121, making it difficult to generate convection with the gas in the truncated cone-shaped pipeline, and thus reducing the real-time performance of hydrogen concentration detection.

[0077] Preferably, the axial length of the cylindrical pipe (ie, the length along the axial direction from the intersection point with the detection surface to the intersection point with the waist surface of the truncated cone-shaped pipe) is 4 to 4.5 mm.

[0078] Further, refer to Figure 5 The intersection of the axis of the cylindrical pipe and the axis of the truncated cone pipe divides the axis of the truncated cone pipe into the first axis segment t 1 and the second axis segment t 2 ,in:

[0079]

[0080] By limiting the axis ratio as mentioned above, the connecting portion 13 can be arranged at a position close to the middle of the truncated cone-shaped pipeline, thereby ensuring that the low-pressure area can be formed.

[0081] Preferably, the intersection of the axis of the cylindrical pipe and the axis of the truncated cone-shaped pipe is the midpoint of the axis of the truncated cone-shaped pipe.

[0082] In order to ensure the stability of the gas flow in the truncated cone, the axis of the truncated cone pipe and the gas flow direction of the gas to be measured need to be at a predetermined angle, and the predetermined angle is optimally 30°, and an error of ±15° is acceptable.

[0083] Further, refer to Figure 5 , the angles between the cylindrical pipe, the truncated cone pipe and the airflow direction are designed according to a second predetermined ratio, which is expressed as:

[0084]

[0085] Wherein, ∠A is the angle between the axis of the cylindrical pipe and the axis of the truncated cone pipe, ∠B is the angle between the axis of the truncated cone pipe and the airflow direction of the gas to be measured (i.e., the above-mentioned predetermined angle), d 1 is the diameter of the air inlet, l 1 is the axial length of the truncated cone-shaped pipeline, and b is a preset coefficient. In this embodiment, the value range of b is between 2.7 and 3.0.

[0086] Through the above-mentioned second predetermined ratio, the angle between the cylindrical pipe and the truncated conical pipe can be associated with the degree of tapering of the truncated conical pipe, thereby ensuring that the airflow entering the truncated conical pipe can smoothly form a wind vortex in the cylindrical pipe (low pressure area), ensuring that the detection surface can detect the gas to be tested in real time.

[0087] Preferably, the angle between the axis of the cylindrical pipe and the axis of the truncated cone pipe is 60°±5°.

[0088] As an implementation form, refer to Figure 3 , the horizontal cross section of the collecting end 14 is covered by the horizontal cross section of the fixing part 11, that is, the length of the horizontal cross section of the collecting end 14 is smaller than the outer diameter of the fixing part 11. In this way, when the hydrogen concentration detection device 10 is used, it can be directly inserted into the mounting hole to complete the fixed installation without damaging the collecting end 14.

[0089] In this embodiment, in order to detect the anti-oil pollution effect of the above-mentioned truncated cone type collecting end 14, a comparative test is performed using a gas to be tested with a hydrogen concentration of 3% and a gas flow rate of a preset flow rate. The test objects are the hydrogen concentration detection device 10 of this embodiment (hereinafter referred to as the optimized solution) and the detection device that only covers the collecting end with a cover (hereinafter referred to as the pre-optimized solution). After working for 1 day, the test data within 10 minutes of working again are as follows: Figure 6 As shown in the figure (the theoretical detection voltage of 3% hydrogen concentration is 3.5V). It can be seen that the detection results of the scheme before optimization generally fluctuate within the range of 3.5V±0.5, while the scheme after optimization generally fluctuates within the range of 3.5V±0.2. Under the optimal design, the fluctuation range can reach 3.5V±0.15. This design can greatly improve the accuracy of hydrogen concentration detection.

[0090] <Example 2>

[0091] Reference Figure 7 The second embodiment provides a self-cleaning anti-oil probe cover for a hydrogen sensor, comprising:

[0092] An outer shell 1, wherein a contraction channel is arranged inside the outer shell 1 along the airflow direction;

[0093] A fixing seat 2, the fixing seat 2 is mounted on one end of the outer shell 1; a probe of the hydrogen sensor is mounted on one end of the outer shell 1 through the fixing seat 2;

[0094] A central support portion, the central support portion is installed inside the outer shell 1;

[0095] The contraction channel is arranged in a gradually contracting shape along the axial direction, and the size of the inlet end of the contraction channel is larger than the size of the outlet end, and the probe of the hydrogen sensor is arranged close to the outlet end of the contraction channel;

[0096] In this way, a contraction channel is provided inside the outer shell 1 along the airflow direction, and the contraction channel is provided in a gradually contracting shape along the axial direction, presenting a channel structure similar to a Venturi tube. When the gas flows through the contraction part, the flow velocity increases and the pressure decreases. According to the principles of fluid dynamics, especially the Venturi effect and the Bernoulli principle, a self-cleaning airflow channel is created by changing the airflow velocity and pressure, thereby reducing or avoiding the deposition of pollutants on the surface of the hydrogen sensor probe, thereby protecting the sensor from contamination.

[0097] The airflow channel in the probe cover uses the relationship between gas flow velocity and pressure to prevent the intrusion of oil vapor and particulate matter, that is, a lower pressure is formed in the contraction area of ​​the contraction channel to prevent oil vapor from entering the sensor area in reverse, thereby effectively preventing external pollutants from following the airflow into the sensor area, thereby avoiding direct contact of the hydrogen sensor surface with pollutants, and effectively preventing oil and other pollutants from covering the sensor surface, thereby ensuring the stable operation of the sensor in harsh environments, especially in environments with high oil concentrations, providing higher stability and longer service life for the hydrogen sensor;

[0098] The fixing seat 2 is used to fix the hydrogen sensor in an appropriate position, ensure the sealing performance between the probe cover and the hydrogen sensor, and ensure that the gas can only enter through the channel in the probe cover, thereby increasing the overall sealing performance; the central support portion not only provides stable protection for the hydrogen sensor, but also helps guide the airflow along a predetermined path to avoid turbulence, while ensuring that hydrogen molecules can smoothly reach the sensitive elements of the sensor without being hindered by the cover structure, thereby maintaining or improving the sensitivity and accuracy of gas detection.

[0099] By reducing the impact of engine oil on the sensor, the self-cleaning property reduces the cleaning and maintenance frequency of the sensor, thereby extending the service life of the sensor. The present invention has a simple structure, a simpler manufacturing process, and is easy to assemble and replace, thereby reducing production and maintenance costs.

[0100] Furthermore, the inner wall of the contraction channel is in the shape of a frustum of a cone, which provides a gradual transition from the inlet to the outlet, avoiding sharp turns or mutations, helping to reduce the generation of turbulence and airflow separation. The smooth transition can make the airflow more stable and reduce the possibility of oil particles being carried into the channel by the airflow, thereby preventing the oil from entering the sensor element area.

[0101] Furthermore, the installation methods of the fixing base 2 and the outer shell 1 include but are not limited to threaded connection and snap-fit ​​connection, thereby achieving a stable connection with the hydrogen sensor and ensuring good sealing.

[0102] Furthermore, the central support part is any one or more of a columnar support structure, a mesh central support structure, a frame-type central support structure, and a suspension-type central support structure; the suspension-type central support structure may be a cantilever beam or an elastic suspension device;

[0103] In this way, when a columnar central support structure is adopted, the diameter of the cylindrical central support body is slightly smaller than the minimum diameter of the contraction channel to ensure that the airflow can pass smoothly. The length of the central support body can be determined according to the length of the outer shell 1. The ratio of the length of the central support body to the length of the outer shell 1 is 1 / 3 to 1 / 2 to provide sufficient supporting force.

[0104] When a mesh center support structure is used, the mesh structure is composed of metal wire or plastic wire. The structure allows airflow to pass through while providing sufficient support force. The mesh structure can effectively prevent oil particles in the gas from accumulating inside the probe cover and increase the service life of the sensor.

[0105] When a frame-type central support structure is used, the frame-type structure made of metal or plastic has sufficient rigidity to provide stable support. Appropriate ventilation holes or ventilation slots are opened on the frame-type central support structure to provide a larger support area without affecting gas circulation, thereby enhancing the stability of the entire outer shell 1.

[0106] Furthermore, the material of the central support part is any one or more of stainless steel, polyetheretherketone, polytetrafluoroethylene, polyimide, titanium alloy, ceramic material, carbon fiber reinforced plastic, and glass fiber reinforced plastic, so that the central support structure has high strength and good corrosion resistance, thereby ensuring that the central support structure has sufficient rigidity in an oily environment and can resist corrosion and pollution.

[0107] Furthermore, the diameter of the inlet end of the contraction channel is 10 mm to 50 mm.

[0108] Furthermore, the outlet diameter of the contraction channel is 5 mm to 30 mm.

[0109] Furthermore, the length of the contraction channel is 20 mm to 100 mm.

[0110] The interior of the outer shell of the second embodiment is provided with a contraction channel along the airflow direction. The contraction channel is provided in a gradually contracting shape along the axial direction, presenting a channel structure similar to a Venturi tube. When the gas flows through the contraction part, the flow velocity increases and the pressure decreases. According to the principles of fluid dynamics, especially the Venturi effect and the Bernoulli principle, a self-cleaning airflow channel is created by changing the airflow velocity and pressure, thereby reducing or avoiding the deposition of pollutants on the surface of the hydrogen sensor probe, thereby protecting the sensor from contamination.

[0111] The air flow channel in the probe cover of the second embodiment uses the relationship between gas flow velocity and pressure to prevent the intrusion of oil vapor and particulate matter, that is, a lower pressure is formed in the contraction area of ​​the contraction channel to prevent oil vapor from reversely entering the sensor area, thereby effectively preventing external pollutants from following the airflow into the sensor area, thereby avoiding direct contact of the hydrogen sensor surface with pollutants, and effectively preventing engine oil and other pollutants from covering the sensor surface, thereby ensuring the stable operation of the sensor in harsh environments, especially in environments with high engine oil concentrations, providing hydrogen sensors with higher stability and longer service life.

[0112] The fixing seat of the second embodiment of the present invention is used to fix the hydrogen sensor in an appropriate position, ensure the sealing performance between the probe cover and the hydrogen sensor, and ensure that the gas can only enter through the channel in the probe cover, thereby improving the overall sealing performance; the central support portion not only provides stable protection for the hydrogen sensor, but also helps guide the airflow to flow along a predetermined path to avoid turbulence, while ensuring that hydrogen molecules can smoothly reach the sensitive elements of the sensor without being hindered by the cover structure, thereby maintaining or improving the sensitivity and accuracy of gas detection.

[0113] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A hydrogen concentration detection device, characterized in that: include: The collection end is set in the gas to be tested; The detection part includes a detection surface for detecting the hydrogen concentration of the gas in contact with the detection surface; as well as A connecting portion, used to connect the collection end with the detection surface, The collecting end is a truncated cone-shaped pipe, including an air inlet and an air outlet. The axis of the truncated cone-shaped pipe forms a predetermined angle with the gas flow direction of the gas to be measured. The middle part of the truncated cone-shaped pipe is connected to the connecting part to form a connecting port. The truncated cone-shaped pipe gradually contracts along the airflow direction, so that the flow rate of the gas to be measured gradually increases, and the connecting portion is used to form a low-pressure area that is easy to accumulate small molecules in the gas to be measured.

2. The hydrogen concentration detection device according to claim 1, characterized in that: The axial lengths of the air inlet, the air outlet and the truncated cone-shaped pipe satisfy: Wherein, d1 is the diameter of the air inlet, d2 is the diameter of the air outlet, and l1 is the axial length of the truncated cone-shaped pipe.

3. The hydrogen concentration detection device according to claim 2, characterized in that: The sizes of the air inlet, the air outlet, the communication port and the truncated cone-shaped pipe are designed according to a first predetermined ratio, which is expressed as: and: Among them, d3 is the diameter of the connecting port, and a is the preset coefficient.

4. The hydrogen concentration detection device according to claim 2, characterized in that: The angle between the axis of the truncated cone-shaped pipe and the airflow direction of the gas to be measured is 30°±15°, and Wherein, ∠B is the angle between the axis of the truncated cone-shaped pipe and the airflow direction of the gas to be measured.

5. The hydrogen concentration detection device according to claim 1, characterized in that: The connecting portion is a cylindrical pipe. The lengths of the cylindrical pipe and the truncated cone pipe are designed according to the following length ratio: Among them, l1 is the axial length of the truncated cone-shaped pipe, l2 is the length of the cylindrical pipe between the detection surface and the truncated cone-shaped pipe, d1 is the diameter of the air inlet, d2 is the diameter of the air outlet, and d3 is the diameter of the connecting port.

6. The hydrogen concentration detection device according to claim 5, characterized in that: The intersection of the axis of the cylindrical pipe and the axis of the truncated cone pipe divides the axis of the truncated cone pipe into a first axis segment t1 and a second axis segment t2, wherein:

7. The hydrogen concentration detection device according to claim 5, characterized in that: The angles between the cylindrical pipe, the truncated cone pipe and the airflow direction are designed according to a second predetermined ratio, which is expressed as: Among them, ∠A is the angle between the axis of the cylindrical pipe and the axis of the truncated cone pipe, ∠B is the angle between the axis of the truncated cone pipe and the airflow direction of the gas to be measured, and b is a preset coefficient.

8. The hydrogen concentration detection device according to claim 1, characterized in that: Also includes: The fixing part is used to fix the collecting end to the gas container, and the horizontal cross section of the collecting end is covered by the horizontal cross section of the fixing part.

9. The hydrogen concentration detection device according to claim 1, characterized in that: in, The materials of the collecting end and the connecting part are any one or more of stainless steel, polyetheretherketone, polytetrafluoroethylene, polyimide, titanium alloy, ceramic material, carbon fiber reinforced plastic, and glass fiber reinforced plastic.

10. A hydrogen concentration detection device, characterized in that: include: At least one hydrogen concentration detection device according to any one of claims 1 to 7; The controller is electrically connected to the detection unit of the hydrogen concentration detection device.

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