Airflow temperature sensor, method of making the same, and respiratory monitoring device

Abstract

The application provides an airflow temperature sensor, a preparation method thereof and a breath monitoring device, and the airflow temperature sensor comprises a substrate, the substrate comprises a carrier and a grid strip, an inner ring of the carrier has a through hole for guiding airflow, and the grid strip is arranged in the through hole and connected with the carrier; a wire is arranged on the substrate; a thermosensitive coating is arranged on the grid strip and connected with the wire to form a series circuit under the guidance of the grid strip, and the wire is used for outputting an airflow temperature signal detected by the thermosensitive coating. The airflow temperature sensor, the preparation method thereof and the breath monitoring device can output the airflow temperature signal, improve the sensitivity of sensing the airflow temperature, improve the response range of the airflow temperature change, improve the accuracy of sensing the airflow temperature, and improve the processing and manufacturing efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, in particular to an airflow temperature sensor, a preparation method thereof and a respiratory monitoring device. BACKGROUND

[0002] Temperature detection is a common requirement. For special scenarios, such as monitoring the temperature of respiratory airflow or the gas in a long pipe device, for example, the temperature of exhaled gas can reflect the physical and mental state, and an excessively high rise in the temperature of exhaled gas can be a sign of airway inflammation in asthma. Many health problems, such as stress, anxiety, chronic obstructive pulmonary disease, and post-traumatic stress disorder, can be regulated or alleviated through respiratory training. Therefore, there is a great demand for accurate and stable airflow temperature monitoring in daily life and clinical applications.

[0003] Currently, there are technologies for temperature detection using thermal resistance, thermocouples, digital temperature sensors, and infrared temperature measurement. However, these devices affect the flow of gas when detecting the temperature of airflow, and the sensitivity and accuracy of temperature detection are low. SUMMARY

[0004] The present application provides an airflow temperature sensor, a preparation method thereof and a respiratory monitoring device to solve the defects in the prior art that affect the flow of gas when detecting the temperature of airflow, and the sensitivity and accuracy of temperature detection are low, to improve the sensitivity of sensing airflow temperature, the response range to changes in airflow temperature, the accuracy of airflow temperature sensing, and the efficiency of processing and manufacturing.

[0005] The present application provides an airflow temperature sensor, which comprises: a substrate, the substrate comprising a carrier and a grid strip, the inner ring of the carrier having a through hole for conducting airflow, the grid strip being arranged in the through hole and connected with the carrier; a wire, the wire being arranged in the substrate; a thermosensitive coating, the thermosensitive coating being covered on the grid strip and electrically connected with the wire to form a series circuit under the guidance of the grid strip, the wire being used for outputting the airflow temperature signal detected by the thermosensitive coating.

[0006] According to the airflow temperature sensor provided by the present application, the grid strip comprises: a plurality of support segments, both ends of the support segment being connected with the carrier, and the plurality of support segments being arranged at intervals; a plurality of connecting segments, each two adjacent support segments being connected by one connecting segment, and the thermosensitive coating covered on the support segments on both sides being electrically connected with the wire, respectively.

[0007] The airflow temperature sensor provided by the application, the wire comprises: a first branch wire and a second branch wire, the heat-sensitive coating covered on one of the support sections at both sides is electrically connected with the first branch wire, and the heat-sensitive coating covered on the other of the support sections at both sides is electrically connected with the second branch wire.

[0008] The airflow temperature sensor provided by the application, the support sections at both sides are connected with the carrier through one connecting section respectively, and the heat-sensitive coating coated on the connecting section connected with the carrier is electrically connected with the wire.

[0009] The airflow temperature sensor provided by the application, a plurality of support sections are arranged in parallel along the length direction of the support sections.

[0010] The airflow temperature sensor provided by the application, the airflow temperature sensor further comprises: an encapsulation layer, the encapsulation layer is wrapped outside the substrate, the wire and the heat-sensitive coating, and the encapsulation layer is used for waterproofing.

[0011] The airflow temperature sensor provided by the application, the airflow temperature sensor further comprises: a connector, the connector is connected with the substrate, the wire is electrically connected with the connector, and the connector is used for outputting the airflow temperature signal detected by the heat-sensitive coating.

[0012] The airflow temperature sensor provided by the application, the heat-sensitive coating comprises: one of platinum, gold or graphene.

[0013] The application further provides a respiratory monitoring device, which comprises: an airflow guide pipe; and the airflow temperature sensor according to any one of the above, which is arranged in the airflow guide pipe and the through hole of the airflow temperature sensor is in communication with the airflow passage of the airflow guide pipe.

[0014] The application further provides a preparation method of the airflow temperature sensor according to any one of the above, which comprises: obtaining the substrate based on a laser cutting process, and mounting the wire on the substrate to obtain a preliminary processed piece; placing the preliminary processed piece between a cover plate and a bottom plate with a middle hollow region, coating the heat-sensitive coating on the preliminary processed piece through the middle hollow region to obtain the airflow temperature sensor.

[0015] The airflow temperature sensor, the preparation method thereof and the respiratory monitoring device provided by the application can output the airflow temperature signal by arranging the grid bars at the through holes of the carrier, arranging the heat-sensitive coating on the grid bars and connecting the heat-sensitive coating and the wire into a series circuit under the guidance of the grid bars, thereby improving the sensitivity of sensing the airflow temperature, the response range to the change of the airflow temperature, the accuracy of sensing the airflow temperature and the efficiency of processing and manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 is one of the structural schematic diagrams of the airflow temperature sensor provided by the present application;

[0018] Figure 2 is the second structural schematic diagram of the airflow temperature sensor provided by the present application;

[0019] Figure 3 is the structural schematic diagram of the respiration monitoring device provided by the present application.

[0020] Figure 4 is one of the principle schematic diagrams of the preparation process of the airflow temperature sensor provided by the present application;

[0021] Figure 5 is the second principle schematic diagram of the preparation process of the airflow temperature sensor provided by the present application;

[0022] Figure 6 is the flow schematic diagram of the preparation method of the airflow temperature sensor provided by the present application.

[0023] Reference signs:

[0024] 100: substrate; 110: carrier; 120: grid strip; 121: support section; 122: connecting section; 200: wire; 210: first branch; 220: second branch; 300: heat-sensitive coating; 400: joint; 500: encapsulation layer; 600: rough work piece; 610: cover plate; 620: bottom plate; 630: mask area; 700: airflow conduit. DETAILED DESCRIPTION

[0025] In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions in the present application will be clearly and completely described below in combination with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0026] The airflow temperature sensor, the preparation method thereof and the respiration monitoring device of the present application will be described below in combination with Figures 1-6 ​

[0027] As Figure 1 shown, the application provides an airflow temperature sensor, which comprises a substrate 100, a wire 200 and a thermosensitive coating 300.

[0028] The substrate 100 comprises a carrier 110 and a grid strip 120, the inner ring of the carrier 110 has a through hole for guiding airflow, and the grid strip 120 is arranged in the through hole and connected with the carrier 110.

[0029] It can be understood that the substrate 100 is composed of the carrier 110 at the outer ring and the grid strip 120 at the inner ring, the grid strip 120 and the carrier 110 are connected, the grid strip 120 and the carrier 110 can be integrally formed, and the carrier 110 belongs to the support of the entire airflow temperature sensor and plays a role of carrying the grid strip 120.

[0030] The grid strip 120 is in a grid shape, the grid strip 120 is arranged in the through hole in the middle of the carrier 110, the grid strip 120 is composed of a plurality of long strip-shaped components, there are large gaps between the plurality of long strip-shaped components, and the airflow in the through hole will not be blocked.

[0031] The wire 200 is arranged on the substrate 100, and the wire 200 is used to transmit an electrical signal. The substrate 100 can be made of an insulating material, the substrate 100 itself does not conduct electricity, the wire 200 is arranged on the substrate 100, but is not electrically connected with the substrate 100.

[0032] The thermosensitive coating 300 covers the grid strip 120 and is electrically connected with the wire 200 to form a series circuit under the guidance of the grid strip 120, and the wire 200 is used to output the airflow temperature signal detected by the thermosensitive coating 300.

[0033] It can be understood that the thermosensitive coating 300 has electrical conductivity and thermal sensitivity, the resistance value of the thermosensitive coating 300 will change linearly with temperature change, the thermosensitive coating 300 is covered on the grid strip 120, the thermosensitive coating 300 can cover only one surface of the grid strip 120, or can cover both surfaces of the grid strip 120, and this place does not limit whether it is single-sided or double-sided. However, from the wire direction of the grid strip 120, the thermosensitive coating 300 is arranged along the wire direction of the grid strip 120 and does not interrupt. In other words, the thermosensitive coating 300 on the grid strip 120 forms a complete long strip-shaped thermistor under the guidance of the grid strip 120.

[0034] Moreover, the two ends of the thermosensitive coating 300 are respectively electrically connected with the wire 200, the thermosensitive coating 300 is covered on the grid strip 120, the shape of the thermosensitive coating 300 is determined by the shape of the grid strip 120, and the shape of the grid strip 120 is designed to make the thermosensitive coating 300 and the wire 200 electrically connected in series.

[0035] When the air flow passes through the inner ring through hole of the carrier 110, the heat sensitive coating 300 on the grid strip 120 can perceive the temperature of the air flow, and the resistance value of the heat sensitive coating 300 changes, so that the current value flowing through the wire 200 changes, so that the air flow temperature signal can be detected, and the wire 200 can output the air flow temperature signal detected by the heat sensitive coating 300, such as when the wire 200 and the external device are electrically connected, the air flow temperature signal can be output to the external device.

[0036] Here, the grid strip 120 is used as the support of the heat sensitive coating 300, which can expand the contact area of the heat sensitive coating 300 with the air flow, improve the sensitivity of the heat sensitive coating 300 to perceive the temperature of the air flow, and connect the heat sensitive coating 300 in series with the wire 200, which can appropriately expand the length of the heat sensitive coating 300, and the heat sensitive coating 300 does not grow and diffuse and the phenomenon of parallel wiring occurs, which can improve the resistance value of the heat sensitive coating 300 connected to the wire 200, improve the response range to temperature changes, and thus improve the accuracy of the air flow temperature sensing.

[0037] At the same time, the heat sensitive coating 300 is coated on the grid strip 120 of the substrate 100, which can facilitate the rapid processing and molding of the air flow temperature sensor, and can be quickly manufactured through a simple preparation process, improving the processing and manufacturing efficiency.

[0038] The air flow temperature sensor provided by the application sets the grid strip at the through hole of the carrier 110, sets the heat sensitive coating 300 on the grid strip, and connects the heat sensitive coating 300 with the wire 200 in series under the guidance of the grid strip, so as to output the air flow temperature signal, improve the sensitivity of the air flow temperature sensing, improve the response range to the air flow temperature change, improve the accuracy of the air flow temperature sensing, and improve the processing and manufacturing efficiency.

[0039] As shown in Figure 1 In some embodiments, the grid strip includes a plurality of support segments 121 and a plurality of connecting segments 122.

[0040] The two ends of the support segment 121 are connected with the carrier 110, and a plurality of support segments 121 are arranged at intervals; each two adjacent support segments 121 are connected by a connecting segment 122, and the heat sensitive coating 300 covered on the support segments 121 on both sides is electrically connected with the wire 200.

[0041] It can be understood that the two ends of the plurality of support segments 121 are connected with the inner ring of the carrier 110, and a bridge mechanism is formed, which has a certain stability. A connecting segment 122 is arranged between each two adjacent support segments 121. When the heat-sensitive coating 300 covers the grid bars, the heat-sensitive coating 300 covering the support segments 121 on both sides is electrically connected with the wires 200, so that the heat-sensitive coating 300 is guided by the grid bars 120 to form a series circuit electrically connected with the wires 200. Such a structure design can avoid complex processing technology, and form a reliable and stable airflow temperature sensing circuit.

[0042] As shown in Figure 1 some embodiments, the wires 200 include a first branch wire 210 and a second branch wire 220. The heat-sensitive coating 300 covering one of the support segments 121 on both sides is connected with the first branch wire 210, and the heat-sensitive coating 300 covering the other of the support segments 121 on both sides is connected with the second branch wire 220.

[0043] It can be understood that the wires 200 can be divided into the first branch wire 210 and the second branch wire 220. Among the plurality of support segments 121, two support segments 121 on both sides are provided. The heat-sensitive coating 300 covering one of the support segments 121 on both sides is electrically connected with the first branch wire 210, and the heat-sensitive coating 300 covering the other of the support segments 121 on both sides is electrically connected with the second branch wire 220. In this way, the two poles of the heat-sensitive resistor can be respectively connected with a branch wire, and the heat-sensitive coating 300 is connected in series in the airflow temperature sensing circuit.

[0044] As shown in Figure 1 some embodiments, the support segments 121 on both sides are respectively connected with the carrier 110 through a connecting segment 122. The heat-sensitive coating 300 coated on the connecting segment 122 connected with the carrier 110 is electrically connected with the wires 200.

[0045] It can be understood that the support segments 121 on both sides are respectively connected with the carrier 110 through a connecting segment 122. In this way, the reliability of the grid bars 120 can be further improved. The heat-sensitive coating 300 coated on the connecting segment 122 connected with the carrier 110 is electrically connected with the wires 200. In this way, the wires 200 can be prevented from being exposed to the outside, and interference can be further excluded, and the stability of the airflow temperature sensing can be improved.

[0046] As shown in Figure 1 some embodiments, the plurality of support segments 121 are arranged in parallel along the length direction of the support segments 121.

[0047] It can be understood that the plurality of support segments 121 can be arranged in parallel along the length direction of the support segments 121, so as to further improve the stability of the grid bars. In addition, the interval lengths between the plurality of support segments 121 can be equal, so that the heat-sensitive coating 300 can be in uniform contact with the airflow in the through hole, and the accuracy of the detected airflow temperature signal is improved.

[0048] As shown in Figure 2 In some embodiments, the airflow temperature sensor further comprises a packaging layer 500, the packaging layer 500 is coated outside the substrate 100, the conductive wire 200 and the heat-sensitive coating 300, and the packaging layer 500 is used for waterproofing.

[0049] It can be understood that the substrate 100, the conductive wire 200 and the heat-sensitive coating 300 can be coated with the packaging layer 500, the packaging layer 500 can be a parylene film, and the packaging layer 500 can isolate the moisture in the environment, so that the device is not affected by humidity.

[0050] As shown in Figure 1 and Figure 2 In some embodiments, the airflow temperature sensor further comprises a connector 400.

[0051] The connector 400 is connected with the substrate 100, the conductive wire 200 is electrically connected with the connector 400, and the connector 400 is used for outputting the airflow temperature signal detected by the heat-sensitive coating 300.

[0052] It can be understood that the connector 400 can be integrally formed with the substrate 100, the connector 400 can be designed as a USB, micro-USB, Lighting or Type-C interface, the conductive wire 200 can be electrically connected with the connector 400, the connector 400 can be electrically connected with an external device, and the connector 400 can output the airflow temperature signal detected by the heat-sensitive coating 300 to the external device.

[0053] In some embodiments, the airflow temperature sensor, the heat-sensitive coating 300 can comprise one of platinum, gold or graphene.

[0054] It can be understood that the heat-sensitive coating 300 is a heat-sensitive material with a high temperature coefficient of resistance, such as platinum, gold or graphene, and can be processed by a physical method, such as magnetron sputtering or electron beam thermal evaporation.

[0055] As shown in Figure 3 The present application also provides a respiratory monitoring device, which comprises an airflow conduit 700 and the airflow temperature sensor as described above, the airflow temperature sensor is arranged in the airflow conduit 700, and the through hole of the airflow temperature sensor is in communication with the airflow channel.

[0056] It can be understood that the respiratory monitoring device can be composed of the airflow guide pipe 700 and the airflow temperature sensor as described above, the airflow temperature sensor is installed in the airflow guide pipe 700, the side of the base 100 of the airflow temperature sensor can be perpendicular to the length direction of the airflow guide pipe 700, and the respiratory monitoring device can be worn on the human body to monitor the temperature of the exhaled airflow of the human body. By using the airflow temperature sensor provided by the present application, the respiratory monitoring device can more accurately detect the respiratory airflow.

[0057] As Figure 4 , Figure 5 and Figure 6 The present application also provides a preparation method of the airflow temperature sensor, which comprises the following steps 610 to 620.

[0058] Step 610, based on the laser cutting process, the base 100 is obtained, and the lead wire 200 is installed on the base 100 to obtain the preliminary processing piece 600.

[0059] It can be understood that a piece of insulating material can be cut by using the laser cutting process, and the middle region is hollowed out, that is, the grid bars 120 are cut in the inner ring of the support piece to obtain the base 100 composed of the support piece and the grid bars 120, and the lead wire 200 can be installed on the base 100 to obtain the preliminary processing piece 600.

[0060] Step 620, the preliminary processing piece 600 is placed between the cover plate 610 and the bottom plate 620 with a middle hollow region, and the heat-sensitive coating 300 is coated on the preliminary processing piece 600 through the middle hollow region to obtain the airflow temperature sensor.

[0061] It can be understood that, as shown in Figure 4 and Figure 5 , the preparation method can use a mold to fix the preliminary processing piece 600, and the mold can include: a bottom plate 620 with a middle hollow region, that is, a bottom plate 620 with a groove, which can be a circular hollow region in the middle, and the bottom plate 620 can form a mask region 630, which can shield the outer ring of the base plate, that is, the carrier 110, and can expose the place on the preliminary processing piece 600 that needs to be processed; a cover plate 610 protruding in the middle, the bottom plate 620 and the cover plate 610 cooperate to clamp the preliminary processing piece 600 in the groove, and four limiting holes are fixed around to ensure firm clamping and prevent the heat-sensitive coating 300 from growing and spreading in a large area.

[0062] When the preliminary processing piece 600 is placed between the cover plate 610 and the bottom plate 620, the grid bars 120 of the preliminary processing piece 600 can be exposed through the middle hollowed area of the cover plate 610, and the heat-sensitive coating 300 can be sprayed on the grid bars 120, so that the heat-sensitive coating 300 is formed by sputtering growth on the grid bars 120, and the airflow temperature sensor is obtained.

[0063] In the specific preparation process, the key is the hollow structure design. The substrate 100 can be cut into a rectangle first, and the length of the cut rectangle is greater than the length of the corresponding circular area. A specific pattern template is used to cut the substrate 100. Such a pattern design can ensure that when the cover plate 610 is used for sputtering growth, due to the shape of the cut grid bars 120, the heat-sensitive coating 300 can be connected in series, so that the resistance of the heat-sensitive coating 300 can be increased, and the heat-sensitive coating 300 can respond to a larger range of temperature changes. Moreover, the cover plate 610 does not need to be intentionally aligned with high precision, which can ensure good consistency and avoid parallel connection in some places during preparation, thereby reducing the sensitivity of the sensor. Moreover, the prepared airflow temperature sensor can be sprayed with a packaging layer 500 to isolate the influence of environmental humidity.

[0064] The preparation method of the airflow temperature sensor provided by the application adopts a laser cutting process to cut a specific grid bar 120 shape, and then places the preliminary processing piece 600 between the cover plate 610 and the bottom plate 620 with a middle hollowed area, and applies the heat-sensitive coating 300 to the preliminary processing piece 600 through the middle hollowed area, to obtain the airflow temperature sensor. The preparation process of the airflow temperature sensor can be simplified, the efficiency of the processing and preparation can be improved, and the cost of the processing and preparation can be reduced.

[0065] The device embodiments described above are only schematic, and the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. According to actual needs, part or all of the modules can be selected to achieve the purpose of the embodiment scheme. Those skilled in the art can understand and implement it without creative labor.

[0066] Those skilled in the art can clearly understand the technical solutions of the various embodiments from the above description of the embodiments, and the various embodiments can be implemented by means of software with the necessary general hardware platforms, and of course, can also be implemented by hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part of the prior art that makes a contribution, can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, and the like, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0067] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features therein; and these modifications 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 application.

Claims

1. An airflow temperature sensor, characterized in that, include: The base includes a support member and a grid strip, the inner ring of the support member having a through hole for guiding airflow, and the grid strip being disposed in the through hole and connected to the support member; A conductor, wherein the conductor is disposed on the substrate; A thermal coating is applied to the grid strip and electrically connected to the wire under the guidance of the grid strip to form a series circuit. The wire is used to output the airflow temperature signal detected by the thermal coating. The grid strips include: Multiple support segments, both ends of which are connected to the carrier, and the multiple support segments are spaced apart; Multiple connecting segments are provided, with each pair of adjacent support segments connected by one connecting segment, and the thermal coatings covering the support segments on both sides are electrically connected to the wires respectively; The wire includes: The first branch line and the second branch line, wherein the thermal coating covering one of the support segments on both sides is electrically connected to the first branch line, and the thermal coating covering the other of the support segments on both sides is electrically connected to the second branch line.

2. The airflow temperature sensor according to claim 1, characterized in that, The support sections on both sides are respectively connected to the carrier through a connecting section, and the heat-sensitive coating on the connecting section connected to the carrier is electrically connected to the wire.

3. The airflow temperature sensor according to claim 1, characterized in that, The plurality of support segments are arranged in parallel along the length direction of the support segments.

4. The airflow temperature sensor according to any one of claims 1 to 3, characterized in that, Also includes: An encapsulation layer is provided, which covers the substrate, the wires, and the thermal coating, and is used for waterproofing.

5. The airflow temperature sensor according to any one of claims 1 to 3, characterized in that, Also includes: A connector is connected to the substrate, and a wire is electrically connected to the connector. The connector is used to output the airflow temperature signal detected by the thermal coating.

6. The airflow temperature sensor according to any one of claims 1 to 3, characterized in that, The thermosensitive coating includes one of platinum, gold, or graphene.

7. A respiratory monitoring device, characterized in that, include: Airflow duct; The airflow temperature sensor as described in any one of claims 1 to 6, wherein the airflow temperature sensor is disposed inside the airflow duct, and the through hole of the airflow temperature sensor is connected to the airflow channel of the airflow duct.

8. A method for preparing a gas flow temperature sensor as described in any one of claims 1 to 6, characterized in that, include: The substrate is obtained using laser cutting technology, and the wires are installed on the substrate to obtain a preliminary processed part; The pre-processed part is placed between the cover plate and the base plate with a central hollow area, and the thermal coating is applied to the pre-processed part through the central hollow area to obtain the airflow temperature sensor.

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