A formaldehyde detection device

Abstract

The utility model discloses a formaldehyde detection device, comprising: a shell; a PCB mainboard, the shell is arranged on the PCB mainboard; a detection component, the detection component is a formaldehyde sensor, and the formaldehyde sensor is electrically connected to the PCB mainboard; wherein a test cavity is arranged in the shell, and the detection component is arranged in the test cavity; wherein the test cavity includes a suspended inner cavity, and a vent hole connecting the inside and outside of the shell is arranged at the suspended inner cavity. By setting the test cavity and the suspended inner cavity, the structure of the device is optimized, the utilization rate and stability of the formaldehyde sensor are effectively improved, and the test reliability and stability of the device are further ensured, thereby improving the performance of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a formaldehyde detection device. Background Art

[0002] Electrochemical formaldehyde sensor is a common detector used to detect formaldehyde gas in civil environment. Due to the smooth surface, small size, thin thickness and general mechanical strength of its detection sensitive element, it is inevitable that the electrode and the detection element will have poor contact during the actual production and transportation process, resulting in abnormal detection signals, unstable data and other undesirable conditions. In the prior art, in order to improve the one-time manufacturing yield and reduce the ultrasonic welding shell, the design method of fixing the welding plate with glue will also lead to poor performance, and there is obviously room for optimization.

[0003] For example, patent application number CN2014207258344 discloses an electrochemical formaldehyde sensor shell and design structure, including a front shell and a rear shell, the front shell is ultrasonically welded to the rear shell, the front shell includes an electrochemical formaldehyde sensor placement area and a PCB board placement area, an inlet and an outlet are provided between the electrochemical formaldehyde sensor placement area and the PCB board placement area, a circular hole is opened in the middle of the electrochemical formaldehyde sensor placement area, a strip pad is provided next to the circular hole, the strip pad serves to support the sensor reaction plate so that it can contact the measured gas entering through the circular hole to the maximum extent.

[0004] The above scheme protects the formaldehyde sensor with a shell, and its structure enables the formaldehyde sensor to exert maximum efficiency during the measurement process, and is placed together with the PCB board, so as to achieve the effect of the sensor's overall firmness and maximum structural efficiency. However, this scheme still cannot solve the current formaldehyde sensor's unsatisfactory air inlet and outlet contact surface, as well as many other problems such as poor contact of the electrode platinum wire. Summary of the invention

[0005] In response to the problem in the prior art mentioned in the background technology that the small air inlet and outlet contact surface leads to a small membrane electrode receiving surface and incomplete information reception, the utility model provides a formaldehyde detection device, which utilizes a test device body integrated with multiple modules to be compatible with pressure sensors of various specifications and realize a quick-disassembly assembly solution.

[0006] The second invention objective of the present application is to solve the problem that vibrations during the transportation of the device may easily cause the platinum wire electrode to be misaligned, resulting in the risk of unstable data during use.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A formaldehyde detection device comprises: a shell; a PCB mainboard, the shell is arranged on the PCB mainboard; a detection component, the detection component is a formaldehyde sensor, and the formaldehyde sensor is electrically connected to the PCB mainboard; wherein a test cavity is arranged in the shell, and the detection component is placed in the test cavity; wherein the test cavity comprises a suspended inner cavity, and a vent hole connecting the inside and outside of the shell is arranged at the suspended inner cavity.

[0009] This solution solves the problem of insufficient air inlet and outlet contact surface by optimizing the structural design of the detection device, and improves the utilization rate of the sensor to improve the yield of the product. First, by placing the detection component in the test chamber, the influence of the external environment on the sensor is effectively isolated, and the accuracy and stability of the detection are improved. Secondly, through the setting of the vent, the gas exchange inside and outside the shell is realized, and the receiving stability inside the device is maintained. It effectively solves the problems of high poor contact rate between the electrode wire and the detection element and small air inlet and outlet contact surface in the prior art. The setting of the suspended inner cavity can ensure that the detection device has sufficient air inlet and outlet space, that is, the contact area between the air and the formaldehyde sensor, so that the gas can smoothly enter and diffuse on the membrane electrode surface, thereby effectively improving the test reliability and stability of the product.

[0010] Preferably, the housing comprises an upper shell and a lower shell that are buckled together, an installation opening is provided at the edge of the lower shell, a PCB sub-board is connected and provided between the detection component and the PCB main board, and the PCB sub-board is a vertical structure and is provided at the installation opening. The PCB sub-board connected and provided between the detection component and the PCB main board can ensure the mechanical connection firmness and circuit connection stability between the detection component and the PCB main board. The vertical structure of the PCB sub-board effectively solves the problem of loose connection caused by vibration during transportation of the device, further ensures the reliability and stability of the device, and can work stably for a long time under complex environmental conditions.

[0011] Furthermore, an outer frame and an inner frame are provided in the lower shell, and the inner frame includes at least one reinforcing transverse rib; the suspended inner cavity is located in the inner frame, and the formaldehyde sensor is arranged within the range of the inner frame. By combining the inner frame with the outer frame, and providing the reinforcing transverse ribs in the inner frame, the fixing strength of the formaldehyde sensor is effectively improved, and the problem of misalignment of the sensor due to vibration during transportation is avoided, thereby improving the service life and stability of the device and being able to better adapt to complex working environments. It is worth noting that the reinforcing transverse ribs prevent the platinum electrode wires serving as the positive and negative electrodes from being affected by assembly deviation, ensuring that the platinum electrode wires are in uniform contact with the membrane electrode, thereby enhancing the utilization rate of the membrane electrode and solving the problem of poor contact.

[0012] Preferably, the formaldehyde sensor includes a membrane electrode and platinum electrode wires attached to the front and back sides of the membrane electrode; a liquid sheet is provided in the test cavity, and the liquid sheet is provided between the formaldehyde sensor and the upper shell. The liquid sheet is attached to the bottom of the membrane electrode and the platinum electrode wire as a gasket, and is used to absorb the liquid generated during the operation of the membrane electrode, so as to keep the cavity dry, avoid excessive oxidation of the membrane electrode, and extend the service life; it can be seen that the liquid sheet has the function of liquid management, and can support and fix the membrane electrode after absorbing the liquid generated after the membrane electrode reaction. The platinum electrode wires are respectively arranged on both sides of the membrane electrode as positive and negative poles to ensure the normal operation of the proton exchange membrane, and further ensure the effectiveness of the core structure of the sensor under the padding effect of the liquid sheet.

[0013] Furthermore, the platinum electrode wire includes a positive electrode and a negative electrode respectively inserted into two electrode holes; the PCB sub-board includes two electrode holes with high and low offsets corresponding to the positive electrode and the negative electrode, and the negative electrode is closer to the vent. This fool-proof design of high and low offset settings can not only ensure the improvement of assembly yield, but also make the connection between the platinum electrode wire and the PCB sub-board more secure. In addition, the setting of the negative electrode closer to the vent helps to improve the response speed and sensitivity of the sensor. It can better ensure the signal stability and accuracy of the sensor.

[0014] Furthermore, the outer frame is provided with bipolar wire through holes corresponding to the two electrode holes, and the inner frame abuts against the platinum electrode wire. This solution can better protect the platinum electrode wire by optimizing the device structure, while improving the stability and reliability of the sensor. The bipolar wire through holes on the outer frame effectively ensure that the platinum electrode wire will not be bent or contaminated by external factors, and its working state can be guaranteed, avoiding the situation where the sensor performance is affected by changes in external conditions. The abutment design of the inner frame and the platinum electrode wire further strengthens the structure of the sensor, prevents electrode dislocation or damage caused by vibration during transportation or use, and thus improves the service life and reliability of the device.

[0015] Preferably, an adhesive is provided at the installation port, and the adhesive fixes the platinum electrode wire and the PCB sub-board. By using the adhesive, the loosening or falling off of the electrode due to vibration or external force during transportation or use can be effectively avoided, thereby improving the reliability and stability of the device. The setting of the inner frame and its reinforcing ribs can prevent the adhesive from overflowing into the suspended inner cavity and affecting the performance of the membrane electrode, causing poor contact of the platinum electrode wire.

[0016] Preferably, the outer port of the vent hole is covered with a waterproof breathable membrane; the waterproof breathable membrane is flush with the housing. This design can effectively prevent external environmental factors such as water vapor and dust from entering the vent hole, thereby protecting the internal components of the sensor from damage. At the same time, the flush setting of the waterproof breathable membrane can keep the appearance of the device neat and tidy, and does not affect the normal function of the vent hole, extending the service life of the device, and also improving the applicability of the device in complex environments.

[0017] Preferably, a data interface is welded on the PCB mainboard, and the data interface is arranged at an end of the housing away from the installation port. The data interface is arranged at an end of the housing away from the installation port, which can facilitate the user to connect the data cable and also reduce interference during operation. Compared with common solutions, this design improves the data transmission stability and reliability of the device and enhances the user experience.

[0018] Preferably, the formaldehyde sensor includes but is not limited to an optical sensor, a chemical adsorption sensor, a semiconductor sensor or a volatile organic compound sensor. The present application provides a variety of sensor types to choose from to meet different detection needs and application scenarios. Optical sensors are suitable for detecting formaldehyde concentrations through optical properties, chemical adsorption sensors use specific adsorption materials to adsorb formaldehyde molecules and detect them, while semiconductor sensors detect formaldehyde gas through the electrical properties of semiconductor materials, and volatile organic compound sensors can detect formaldehyde components in various volatile organic compounds. The advantage of this design is that the most suitable sensor type can be selected according to specific usage scenarios and needs to achieve the best detection effect and performance. Compared with a single type of sensor, this diverse design improves the applicability and flexibility of the device, and can better meet the different needs and application scenarios of users.

[0019] Therefore, the utility model has the following beneficial effects:

[0020] (1) By setting up the test cavity and the suspended inner cavity, the structure of the device is optimized, which effectively improves the utilization rate and stability of the formaldehyde sensor, further ensures the test reliability and stability of the device, and thus improves the performance of the product.

[0021] (2) The vertical structure of the PCB sub-board and the reinforcement design of the inner and outer frames solve the problems of loose connection and misalignment of platinum electrodes caused by vibration during transportation, ensure the reliability and stability of the device, and further improve the product's service life and ability to adapt to complex environments.

[0022] (3) Through measures such as the design of the inner frame and adhesive fixation, the problems of high poor contact rate between the electrode wire and the detection element and misalignment of the platinum electrode wire were effectively solved, the stability and contact efficiency of the sensor were improved, and the data reception integrity and accuracy of the device were improved.

[0023] (4) The waterproof and breathable membrane covering setting and the reasonable layout of the data interface effectively prevent the influence of external environmental factors on the internal components of the sensor, improve the durability and stability of the device, and enhance the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] Figure 2 It is an exploded view of the utility model.

[0026] Figure 3 It is a side sectional view of the utility model.

[0027] Figure 4 It is a side sectional view of the negative pole of the platinum electrode wire in the utility model.

[0028] Figure 5 It is a structural schematic diagram of the lower shell of the utility model.

[0029] Shell 100, vent 101, waterproof breathable membrane 1, lower shell 2, outer frame 21, pole wire through hole 211, inner frame 22, reinforcing transverse rib 23, installation port 24, suspended inner cavity 25, membrane electrode 3, liquid sheet 4, platinum electrode wire 5, positive electrode 51, negative electrode 52, PCB main board 6, PCB sub-board 7, electrode hole 71, upper shell 8, data interface 9. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Example 1

[0032] like Figure 1 , 2 As shown, a formaldehyde detection device comprises: a housing 100; a PCB main board 6, the housing 100 is arranged on the PCB main board 6; a detection component, the detection component is a formaldehyde sensor, and the formaldehyde sensor is electrically connected to the PCB main board 6; wherein a test cavity is arranged in the housing 100, and the detection component is arranged in the test cavity; wherein, as Figure 3As shown, the test cavity includes a suspended inner cavity, and a vent hole 101 connecting the inside and outside of the shell 100 is arranged at the suspended inner cavity 25. The shell 100 includes an upper shell 8 and a lower shell 2 that are buckled together, and an installation port 24 is arranged at the edge of the lower shell 2. A PCB sub-board 7 is connected between the detection component and the PCB main board 6, and the PCB sub-board 7 is a vertical structure and is arranged at the installation port 24. An outer frame 21 and an inner frame 22 are arranged in the lower shell 2, and the inner frame 22 includes at least one reinforcing transverse rib 23; the suspended inner cavity 25 is located in the inner frame 22, and the formaldehyde sensor is arranged within the range of the inner frame 22. As shown Figure 4 As shown, the formaldehyde sensor includes a membrane electrode 3 and platinum electrode wires 5 attached to the front and back sides of the membrane electrode 3. A liquid sheet 4 is arranged in the test cavity. The liquid sheet 4 is arranged below the membrane electrode 3 and the positive electrode 51 of the platinum electrode wire as a gasket.

[0033] This solution solves the problem of insufficient air inlet and outlet contact surface by optimizing the layout of the detection device, and improves the utilization rate of the sensor to improve the yield of the product. First, by placing the detection component in the test chamber, the influence of the external environment on the sensor is effectively isolated, and the accuracy and stability of the detection are improved. Secondly, through the setting of the vent 101, the gas exchange between the inside and outside of the shell 100 is achieved, and the receiving stability inside the device is maintained. It effectively solves the problems of high poor contact rate between the electrode wire and the detection element and small air inlet and outlet contact surface in the prior art. The setting of the suspended inner cavity 25 can ensure that the detection device has sufficient air inlet and outlet space, that is, the contact area between the air and the formaldehyde sensor, so that the gas can smoothly enter and diffuse on the surface of the membrane electrode 3, thereby effectively improving the test reliability and stability of the product.

[0034] The PCB sub-board 7 connected between the detection component and the PCB main board 6 can ensure the mechanical connection firmness and circuit connection stability between the detection component and the PCB main board 6. The vertical structure of the PCB sub-board 7 effectively solves the problem of loose connection caused by vibration during transportation of the device, further ensures the reliability and stability of the device, and can work stably for a long time under complex environmental conditions. Through the combination of the inner frame 22 and the outer frame 21, and the setting of the reinforced transverse ribs 23 in the inner frame 22, the fixing strength of the formaldehyde sensor is effectively improved, the misalignment problem of the sensor caused by vibration during transportation is avoided, the service life and stability of the device are improved, and it can better adapt to complex working environments. It is worth noting that the reinforced transverse ribs 23 prevent the platinum electrode wire 5 as the positive and negative electrodes 52 from being affected by the assembly offset, ensure that the platinum electrode wire 5 is in uniform contact with the membrane electrode 3, enhance the utilization rate of the membrane electrode 3, and solve the problem of poor contact.

[0035] The fitting arrangement of the membrane electrode 3 and the liquid sheet 4 can ensure a good seal between the sensor and the housing 100, prevent the external environment from affecting the sensor, and thus improve the accuracy and stability of the detection. The platinum electrode wire 5 is respectively arranged on both sides of the membrane electrode 3 as the positive and negative poles to ensure the normal operation of the proton exchange membrane, and further ensure the anti-interference of the sensor core structure under the fitting and fixation of the liquid sheet 4.

[0036] Furthermore, the platinum electrode wire 5 includes a positive electrode 51 and a negative electrode 52 respectively inserted into two electrode holes 71; the PCB sub-board 7 includes two electrode holes 71 arranged at high and low positions corresponding to the positive electrode 51 and the negative electrode 52, and the negative electrode 52 is closer to the vent 101. This fool-proof design of the high and low misalignment setting can not only ensure the improvement of the assembly yield rate, but also make the connection between the platinum electrode wire 5 and the PCB sub-board 7 more secure. In addition, the setting of the negative electrode 52 closer to the vent 101 helps to improve the response speed and sensitivity of the sensor. It can better ensure the signal stability and accuracy of the sensor.

[0037] It is worth noting that the outer frame 21 is provided with two electrode wire through holes 211 corresponding to the two electrode holes 71, and the inner frame 22 is in contact with the platinum electrode wire 5. The mounting opening is provided with an adhesive, and the adhesive fixes the platinum electrode wire 5 and the PCB sub-board 7.

[0038] This solution can better protect the platinum electrode wire 5 by optimizing the device structure, while improving the stability and reliability of the sensor. Figure 5 As shown, through the bipolar wire through hole 211 on the outer frame 21, the negative electrode hole and the positive electrode hole are staggered in height, and the negative electrode hole is set shorter than the positive electrode hole. This can ensure that the platinum electrode wires arranged on both sides of the membrane electrode can be installed straight, effectively ensuring that the platinum electrode wire 5 will not be bent or contaminated by external factors, and can also ensure its working state, avoiding the situation where the sensor performance is affected by changes in external conditions. The abutment design of the inner frame 22 and the platinum electrode wire 5 further strengthens the structure of the sensor, prevents the electrode from being dislocated or damaged due to vibration during transportation or use, thereby improving the service life and reliability of the device. Through the use of adhesive, the loosening or falling off of the electrode due to vibration or external force during transportation or use can be effectively avoided, thereby improving the reliability and stability of the device. The setting of the inner frame 22 and its reinforcing ribs can prevent the adhesive from overflowing into the suspended inner cavity 25 and affecting the performance of the membrane electrode 3, causing the platinum electrode wire 5 to have poor contact.

[0039] In addition, the outer end of the vent hole 101 is covered with a waterproof breathable membrane 1; the waterproof breathable membrane 1 is flush with the housing 100. This design can effectively prevent external environmental factors such as water vapor and dust from entering the vent hole 101, thereby protecting the internal components of the sensor from damage. At the same time, the flush setting of the waterproof breathable membrane 1 can keep the appearance of the device neat and tidy, and does not affect the normal function of the vent hole 101, extending the service life of the device, and also improving the applicability of the device in complex environments.

[0040] The PCB main board 6 is welded with a data interface 9, which is arranged at an end of the housing 100 away from the installation opening 24. The data interface 9 is arranged at the end of the housing 100 away from the installation opening 24, which can facilitate the user to connect the data cable and also reduce interference during operation. Compared with common solutions, this design improves the data transmission stability and reliability of the device and enhances the user experience.

[0041] The formaldehyde detection device disclosed in this embodiment is intended to solve various problems that occur in the production and transportation of existing formaldehyde sensors and improve the yield and stability of the product. The device includes a housing 100, a PCB mainboard 6 and a detection component, wherein the detection component is a formaldehyde sensor, which is electrically connected to the PCB mainboard 6 and is placed in a test cavity in the housing 100. The test cavity is designed to have a suspended inner cavity, in which a vent 101 connecting the inside and outside of the housing 100 is provided to ensure the exchange of gas in the device and the stability of the sensor. The optimized structural design mainly solves the following problems: First, the poor contact rate between the electrode wire and the detection element is high, resulting in increased costs; second, the small contact surface of the air inlet and outlet leads to poor one-time performance; third, the vibration during transportation causes the platinum wire electrode to be dislocated, resulting in unstable data.

[0042] Specifically, the optimized design is achieved by:

[0043] First, the detection component is placed in the test chamber, which effectively isolates the influence of the external environment on the sensor and improves the accuracy and stability of the detection. Secondly, the gas exchange inside and outside the shell 100 is realized by setting the vent hole 101, and the receiving stability inside the device is maintained. These two points solve the problems of high poor contact rate between the electrode wire and the detection element and small contact surface between the air inlet and outlet.

[0044] Furthermore, the housing 100 adopts a design of combining an upper and lower shell 2, an installation port 24 is provided at the edge of the lower shell 2, and a PCB sub-board 7 is provided between the detection component and the PCB main board 6 to ensure the stability of the connection. An outer frame 21 and an inner frame 22 are provided inside the lower shell 2, and the inner frame 22 includes at least one reinforcing transverse rib 23, which effectively improves the fixing strength of the formaldehyde sensor, avoids the problem of misalignment during transportation, and thus improves the service life and stability of the device.

[0045] The formaldehyde sensor includes a membrane electrode and a platinum electrode wire 5 fitted on the front and back sides of the membrane electrode; a liquid sheet 4 is arranged in the test cavity, and the liquid sheet 4 is arranged between the formaldehyde sensor and the upper shell. The formaldehyde sensor includes a membrane electrode and a platinum electrode wire fitted on the front and back sides of the membrane electrode; a liquid sheet is arranged in the test cavity, and the liquid sheet is arranged between the formaldehyde sensor and the upper shell. The liquid sheet is fitted at the bottom of the membrane electrode and the platinum electrode wire as a gasket to absorb the liquid generated during the working process of the membrane electrode, so as to keep the cavity dry, avoid excessive oxidation of the membrane electrode, and extend the service life; it can be seen that the liquid sheet has the function of liquid management, and can support and fix the membrane electrode after absorbing the liquid generated after the membrane electrode reaction. The platinum electrode wire is respectively arranged on both sides of the membrane electrode as the positive and negative poles.

[0046] In addition, the platinum electrode wire 5 includes a positive electrode 51 and a negative electrode 52 respectively inserted into two electrode holes 71. The PCB sub-board 7 is provided with two electrode holes 71 with high and low offsets corresponding to the positive electrode 51 and the negative electrode 52. The negative electrode 52 is closer to the vent 101. This design not only ensures the assembly yield, but also increases the response speed and sensitivity of the sensor.

[0047] Finally, the outer frame 21 is provided with two-pole wire through holes 211 corresponding to the two electrode holes 71, the inner frame 22 is in contact with the platinum electrode wire 5, and an adhesive is provided at the mounting opening to fix the platinum electrode wire 5 and the PCB sub-board 7. This design effectively protects the platinum electrode wire 5 and improves the stability and reliability of the sensor.

[0048] In the embodiment, the first thing to consider is the assembly process of the formaldehyde detection device. The assembly of the detection device is usually completed by professional production workers or automated assembly lines. During the assembly process, it is necessary to pay attention to keeping the cleanliness and integrity of each component to ensure the quality and performance of the final product. First, the assembly of the shell includes connecting the upper shell 8 and the lower shell 2 to ensure that they are buckled with each other, and the mounting port 24 set on the edge of the lower shell 2 must correspond to the PCB sub-board 7 of the detection component to ensure that the connection between the detection component and the PCB main board 6 is firm. The PCB sub-board 7 should be arranged at the mounting port 24 in a vertical structure and be stably connected to the detection component. The setting of the outer frame 21 and the inner frame 22 in the lower shell 2 should also be noted. The inner frame 22 has a reinforcing cross rib 23 to improve the fixing strength of the formaldehyde sensor and avoid misalignment problems during transportation.

[0049] Next is the assembly of the formaldehyde sensor. The formaldehyde sensor includes a membrane electrode 3 and a platinum electrode wire 5. During the assembly process, the platinum electrode wire 5 must first be inserted into the two electrode holes 71 respectively to ensure the correct connection of the positive and negative electrodes 52, and note that the negative electrode 52 is the electrode closer to the vent 101. Then, align the platinum electrode wire 5 on the PCB sub-board 7 with the platinum wire groove of the lower shell 2, and drip glue into it to fix it. Note that the amount of glue should be appropriate to avoid overflow. Next, the liquid sheet 4 is attached to the bottom of the membrane electrode 3 to ensure that the liquid generated by the membrane electrode is absorbed in time, thereby reducing the oxidation rate of the membrane electrode. While the liquid sheet 4 is attached, ensure that the platinum electrode wire 5 is clamped on the front and back sides of the membrane electrode 3 to ensure the normal operation of the sensor. Finally, assemble the upper shell 8 and the lower shell 2 together for ultrasonic welding to ensure the sealing of the detection cavity.

[0050] After the device is assembled, some details need to be paid attention to. For example, a waterproof breathable membrane 1 is provided to cover the outer port of the vent hole 101 to prevent external environmental factors such as water vapor and dust from entering the vent hole 101 and protect the internal components of the sensor from damage. In addition, when the data interface 9 is provided on the PCB main board 6, it should be provided at the end of the housing away from the installation port 24 to facilitate the user to connect the data cable and reduce interference during operation.

[0051] In actual use, the user only needs to place the formaldehyde detection device in the environment that needs to be detected, and ensure that the waterproof and breathable membrane 1 at the outer end of the vent 101 is in contact with the environment to ensure smooth ventilation. The device will automatically detect formaldehyde gas and transmit the detection results to an external device through the data interface 9 for display or recording. The user can check the detection results at any time as needed to ensure the safe level of formaldehyde gas in the environment.

[0052] This solution solves common problems in the production and transportation of traditional formaldehyde sensors through optimized structural design, such as poor contact between electrodes and detection elements, insufficient contact surface between air inlet and outlet, etc., thereby improving the one-time manufacturing yield and stability of the product and reducing production costs. At the same time, the solution also takes into account the actual use needs of users and makes corresponding optimizations in design, improving the convenience and reliability of the device and enhancing the user experience.

[0053] When applying this solution, those skilled in the art may also make replacements or improvements according to specific circumstances. For example, alternative materials may be used to replace the platinum electrode wire 5 to reduce costs; the design of the waterproof and breathable membrane 1 at the outer port of the vent 101 may be further optimized to improve the applicability of the device in complex environments; more advanced assembly techniques and materials may also be explored to further improve the performance and stability of the product.

[0054] Example 2

[0055] Different from the electrochemical sensor in Example 1, in this embodiment, the formaldehyde sensor includes but is not limited to an optical sensor, a chemical adsorption sensor, a semiconductor sensor or a volatile organic compound sensor to adapt to different detection needs and application scenarios. Optical sensors are suitable for detecting formaldehyde concentrations through optical properties, chemical adsorption sensors use specific adsorption materials to adsorb formaldehyde molecules and detect them, semiconductor sensors detect formaldehyde gas through the electrical properties of semiconductor materials, and volatile organic compound sensors can detect formaldehyde components in various volatile organic compounds. The advantage of this design is that the most suitable sensor type can be selected according to the specific usage scenario and needs to achieve the best detection effect and performance. Compared with a single type of sensor, this diverse design improves the applicability and flexibility of the device and can better meet the different needs and application scenarios of users.

Claims

1. A formaldehyde detection device, characterized in that: include: case; PCB main board, the housing is arranged on the PCB main board; A detection component, which is a formaldehyde sensor, and the formaldehyde sensor is electrically connected to the PCB main board; Wherein, a test cavity is provided in the shell, and the detection component is placed in the test cavity; Wherein, the test cavity includes a suspended inner cavity, and the suspended inner cavity is provided with a vent hole communicating with the inside and outside of the shell.

2. A formaldehyde detection device according to claim 1, characterized in that: The shell includes an upper shell and a lower shell that are buckled together, the edge of the lower shell is provided with a mounting opening, a PCB sub-board is connected and provided between the detection component and the PCB main board, and the PCB sub-board is a vertical structure and is provided at the mounting opening.

3. A formaldehyde detection device according to claim 2, characterized in that: An outer frame and an inner frame are arranged in the lower shell, and the inner frame includes at least one reinforcing transverse rib; the suspended inner cavity is located in the inner frame, and the formaldehyde sensor is arranged within the range of the inner frame.

4. A formaldehyde detection device according to claim 3, characterized in that: The formaldehyde sensor comprises a membrane electrode and platinum electrode wires arranged on the front and back sides of the membrane electrode; a liquid sheet is arranged in the test cavity, and the liquid sheet is arranged between the formaldehyde sensor and the upper shell.

5. A formaldehyde detection device according to claim 4, characterized in that: The PCB sub-board includes two electrode holes with different heights corresponding to the positive and negative electrodes, and the platinum electrode wire includes a positive electrode and a negative electrode respectively inserted into the two electrode holes; the negative electrode is closer to the vent hole.

6. A formaldehyde detection device according to claim 5, characterized in that: The outer frame is provided with two polar wire through holes corresponding to the two electrode holes, and the inner frame abuts against the platinum electrode wire.

7. A formaldehyde detection device according to claim 3, characterized in that: The installation opening is provided with adhesive, and the adhesive fixes the platinum electrode wire and the PCB sub-board.

8. A formaldehyde detection device according to any one of claims 1 to 7, characterized in that: The outer port of the vent hole is covered with a waterproof breathable membrane; the waterproof breathable membrane is flush with the shell.

9. A formaldehyde detection device according to any one of claims 1 to 7, characterized in that: A data interface is welded on the PCB main board, and the data interface is arranged at an end of the shell away from the installation opening.

10. A formaldehyde detection device according to claim 1, characterized in that: The formaldehyde sensor allows the use of, but is not limited to, an optical sensor, a chemical adsorption sensor, a semiconductor sensor or a volatile organic compound sensor.

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