A handheld VOCs detector with filtering function

Abstract

The utility model relates to air detection equipment technical field especially a kind of handheld VOCs detector with filtering function, comprising: body, the back of this body is equipped with sound hole;Sound hole isolation gain mechanism, it includes the positioning seat of detachable installation with body and the isolation gain sheet of detachable rotary installation with positioning seat, isolation gain film is detachably installed on the isolation gain sheet, the isolation gain film is used to isolate internal sound cavity and external atmosphere, for solving the technical problem that abnormality and detection function abnormality influence service life caused by dust jamming generation hole existing in detector of prior art easily.

Description

Technical Field

[0001] This utility model relates to the field of air detection equipment technology, and in particular to a handheld VOCs detector with a filtration function. Background Technology

[0002] Handheld VOCs detectors typically draw in air samples for testing via a built-in miniature sampling pump. The volatile organic compounds (VOCs) in the sample enter the core detection unit and interact with sensors (commonly photoionization PID sensors, electrochemical sensors, etc.). For example, a PID sensor uses a UV lamp of specific energy to ionize VOCs molecules, generating a weak current. The instrument's signal processing module then amplifies and converts this current signal into a digital signal, calculates the specific VOCs concentration based on a pre-calibrated concentration curve, and displays the results in real time on the screen. Some instruments also alert the user with audible and visual alarms when the concentration exceeds the limit.

[0003] A handheld VOCs detector is disclosed in the prior art, according to a new patent with publication number CN212872363U. It includes a housing, a display screen mounted on the surface of the housing, a detection tube extending from the top of the housing and passing through the top of a rubber sleeve, the rubber sleeve being fitted onto the outer wall of the housing, and an inner hole being formed inside the rubber sleeve, the inner hole being filled with a triangular sphere, and a retainer A being fixedly connected to the outer walls of both ends of the rubber sleeve, with a button protruding on the surface of the housing between the retainers A, and a retainer foot A embedded in the retainer A. The aforementioned technical solutions and related technologies still have many problems, such as: in actual use, the sound-emitting part of the VOCs detector is generally equipped with holes for sound generation. When working in areas with high outdoor dust, dust particles can easily block the sound-emitting holes or enter the interior of the VOCs detector through the holes; dust blocking the holes can cause the instrument's alarm sound (such as the sound and light alarm when the concentration exceeds the standard) to weaken, become distorted, or even fail to be transmitted at all. After dust enters the instrument through the holes, it will adhere to the circuit board, sensors (such as PID sensors), miniature sampling pumps and other precision components, which may cause poor circuit contact, short circuits, and shorten the instrument's lifespan. Utility Model Content

[0004] The purpose of this invention is to provide a handheld VOCs detector with a filtering function, which solves the technical problems of dust clogging the generating holes and causing abnormalities, as well as abnormal detection function affecting the service life of existing detectors.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A handheld VOCs detector with filtering function includes:

[0007] The main body has a sound-emitting hole on its back;

[0008] A sound-emitting hole isolation gain mechanism includes a positioning seat detachably mounted to the main body and an isolation gain plate detachably and rotatably mounted to the positioning seat. An isolation gain film is detachably mounted on the isolation gain plate, and the isolation gain film is used to isolate the internal sound-emitting cavity from the external atmosphere.

[0009] Furthermore, the isolation gain plate includes an annular positioning disk and a pressure ring. The positioning disk has an annular L-shaped groove, and the isolation gain film is embedded in the L-shaped groove and then pressed and limited by the pressure ring.

[0010] Furthermore, the positioning base includes a ring-shaped chuck with several guide channels and locking channels arranged in a ring array. The guide channels are fan-shaped grooves, and the locking channels are U-shaped slots communicating with the fan-shaped channels. The bottom surface of the positioning base is provided with several fixed locking blocks that match the number of locking channels. Each fixed locking block includes a fixed base integrated with the positioning base and a locking block connected to the fixed base at one end. The other end of the locking block is a free end, and the locking block is inserted into the locking channel.

[0011] Furthermore, the isolation gain film is made of ePTFE film.

[0012] Furthermore, the isolation gain film is made of a filter.

[0013] Furthermore, the sum of the arc lengths of the fixing seat and the locking block is not greater than the arc length of the guide channel, and the thickness of the locking block is not greater than the axial groove depth of the U-shaped groove of the locking channel.

[0014] Furthermore, a portable operating component is also installed on the main body, which includes a receiving channel disposed on the main body and a receiving seat detachably mounted on the receiving seat, the receiving seat being provided with a ferrule.

[0015] Furthermore, the receiving seat is inserted and installed on the receiving channel, and both the receiving channel and the receiving seat have a T-shaped or trapezoidal cross-section.

[0016] Furthermore, a rubber layer can be detachably installed on the inner wall of the sleeve.

[0017] Furthermore, the chuck is detachably mounted to the body via screws, and the pressure ring and the positioning plate are detachably mounted via screws.

[0018] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0019] (1). This utility model installs a sound hole isolation gain mechanism at the sound hole, and uses an isolation gain film to filter the air entering the sound hole. By making the isolation gain mechanism and the main body detachable, it is easy to disassemble and replace the isolation gain film, thereby avoiding the phenomenon that the detector cannot be used normally due to dust clogging the sound hole or dust adhering to the circuit board and other electrical components, and improving the service life of the detector.

[0020] (2). This utility model, by setting a detachable positioning plate and pressure ring, facilitates the replacement and installation of the isolation gain film, making maintenance convenient; by setting a detachable installation structure between the chuck and the positioning plate, as well as a specific structure for detachable rotational installation, it realizes quick disassembly and assembly between the isolation gain film and the positioning seat, which helps to improve maintenance and replacement efficiency; by using ePTFE film as the isolation gain film, on the one hand, the microporous structure of ePTFE film is very precise and uniform, which can easily capture submicron-level dust particles, and the micropores of the film are smaller than the dust particles, so the dust is completely blocked on the surface of the film and cannot enter the base fabric. When cleaning, the dust layer can easily fall off from the smooth film surface. On the other hand, when the speaker unit is producing sound, especially in a narrow cavity, it will produce unnecessary resonance and sharp peaks. The ePTFE film can act as a sound damper, which can significantly improve the clarity, fullness, loudness and overall listening experience of the sound, thereby achieving the purpose of gain. Attached Figure Description

[0021] Figure 1 This is a front view schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a rear view of the structure of this utility model;

[0023] Figure 3 This is a bottom view of the structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the sound-emitting hole isolation and gain mechanism of this utility model.

[0025] Figure 5 This is a bottom view of the sound-emitting hole isolation gain mechanism of this utility model.

[0026] Figure 6 This is an exploded view of the sound-emitting hole isolation gain mechanism of this utility model.

[0027] Figure 7 The structure of this utility model Figure 6 Side view;

[0028] Figure 8 The structure of this utility model Figure 6 A sectional view;

[0029] Figure 9 The structure of this utility model Figure 8 Side view;

[0030] Figure 10 This is a schematic diagram of the structural positioning seat of this utility model;

[0031] Figure 11 This is a schematic diagram of the second embodiment of the structure of this utility model;

[0032] Figure 12 This is a schematic diagram of the U-shaped ferrule in the second embodiment of the present invention.

[0033] In the diagram: 100, main body; 200, sound hole isolation gain mechanism; 21, positioning seat; 211, chuck; 212, guide channel; 213, locking channel; 22, isolation gain plate; 221, positioning plate; 222, pressure ring; 223, fixing seat; 224, locking block; 225, isolation gain film; 300, portable operating component; 31, receiving channel; 32, receiving seat; 33, ferrule. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0036] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0037] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0038] In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] To address the limitations of existing technologies, this embodiment provides a technical solution. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0041] This invention addresses the common problem in existing detectors where dust easily accumulates and clogs the sound-emitting holes. By installing a filter structure at the sound-emitting hole, the air entering the hole is filtered, thus preventing dust carried by the air from clogging the sound-emitting hole and causing detector malfunction.

[0042] Example 1

[0043] See appendix Figure 1-3 A handheld VOCs detector with filtering function includes: a main body 100, the back of which has a sound-emitting hole; and a sound-emitting hole isolation and gain mechanism 200. The purpose of the sound-emitting hole isolation and gain mechanism 200 is to filter the air entering the sound-emitting hole. It includes a positioning base 21 detachably mounted to the main body 100 and an isolation gain plate 22 detachably rotatably mounted to the positioning base 21. An isolation gain film 225 is detachably mounted on the isolation gain plate 22, and the isolation gain film 225 is used to isolate the internal sound-emitting cavity from the external atmosphere. It is understood that the isolation gain film 225 is the core component of the sound-emitting hole isolation and gain mechanism 200. It can isolate dust and impurities from the sound-emitting hole while also amplifying the sound emitted from the sound-emitting hole. Dust will not clog the sound-emitting hole, nor will it enter the instrument through the hole, thereby improving the instrument's service life.

[0044] See appendix Figure 4-10The isolation gain plate 22 includes an annular positioning plate 221 and a pressure ring 222. The pressure ring 222 is detachably installed to the positioning plate 221 by screws. The pressure ring ensures that the isolation gain film 225 remains flat during installation, reducing sound loss or unstable gain effect caused by film wrinkles. The positioning plate 221 has an annular L-shaped groove. After the isolation gain film 225 is embedded in the L-shaped groove, it is pressed and limited by the pressure ring 222. It can be understood that the L-shaped groove can be understood as the positioning plate 221 being an annular structure with an L-shaped cross-section that is high at the edges and low at the center. The purpose of the L-shaped groove is to embed the isolation gain film 225. The size of the pressure ring 222 matches the inner diameter of the L-shaped groove for pressing onto the isolation gain film 225. Then, the pressure ring 222, the isolation gain film 225, and the positioning plate 221 are installed together by through screws. The isolation gain film 225 is preferably made of ePTFE film, or it can also be made of filter screen. Understandably, ePTFE films have a nanoscale microporous network with pore sizes typically between 0.1 and 20 micrometers; allowing sound waves to pass through freely while effectively blocking dust particles, such as PM2.5, and liquid intrusion; the three-dimensional mesh fibers of ePTFE can reduce sound wave reflection, minimizing energy loss when sound passes through the film, thereby avoiding sound distortion. Furthermore, the numerous micropores on the ePTFE film create resistance to airflow. When sound waves pass through these micropores, some of their energy is consumed and converted, with the film acting as a damper. In addition, the ePTFE film covering the sound-emitting hole and the cavity beneath it together form a miniature acoustic system. This structure optimizes the energy transfer efficiency of sound waves from amplitude to free space, better couples the impedance between the speaker unit and the external air, and reduces energy reflection and loss at the exit point. Simultaneously, when the speaker unit is working, it needs to move back and forth to push the air. Within the sealed cavity, rapid air pressure changes occur, balancing the air pressure and protecting the diaphragm amplitude. Overall, the ePTFE film significantly improves the clarity, fullness, loudness, and overall listening experience of the sound, thereby achieving the goal of gain.

[0045] See appendix Figure 6-10The positioning base 21 includes a ring-shaped chuck 211, which is detachably installed on the body 100 by screws. The chuck 211 is provided with a plurality of guide channels 212 and locking channels 213 arranged in a ring. In this embodiment, there are five sets of guide channels 212 and locking channels 213, in which each set of guide channels 212 and locking channels 213 are used in conjunction. Specifically, the guide channel 212 is a fan-shaped groove, and the locking channel 213 is a U-shaped groove communicating with the fan-shaped channel. Here, the U-shaped groove is a groove with the opening facing outward. The bottom surface of the positioning disk 221 is provided with a plurality of fixed locking blocks 224 matching the number of locking channels 213. The fixed locking block 224 includes a fixed base 223 integral with the positioning disk 221 and a locking block 224 connected to the fixed base 223 at one end. The other end of the locking block 224 is a free end, and the locking block 224 is inserted into the locking channel 213. Specifically, the sum of the arc lengths of the fixing seat 223 and the locking block 224 is not greater than the arc length of the guide channel 212, and the thickness of the locking block 224 is not greater than the axial groove depth of the U-shaped groove in the locking channel 213. This limitation is intended to allow the fixing block and locking block 224 to first embed into the guide channel 212, and then, by relatively rotating the positioning disk 221 and the positioning seat 21, slide the locking block 224 into the locking channel 213, thereby achieving relative positioning of the positioning disk 221 and the positioning seat 21.

[0046] See appendix Figure 2 and 3 The main body 100 is also equipped with a portable operating component 300, which includes a receiving channel 31 disposed on the main body 100 and a receiving seat 32 detachably mounted on a receiving base 32, the receiving base 32 having an annular retaining sleeve 33. Specifically, the receiving seat 32 is inserted into the receiving channel 31, and both the receiving channel 31 and the receiving seat 32 have a T-shaped or trapezoidal cross-section. In addition, a rubber layer is detachably installed on the inner wall of the retaining sleeve 33. It can be understood that the insertion and installation of the receiving channel 31 and the receiving seat 32 facilitates quick installation and removal of the receiving seat 32, thereby allowing for the replacement of different sized retaining sleeves 33 to suit different hand sizes, meeting the usage habits and ergonomic needs of different operators, and improving the applicability and user experience of the device.

[0047] Example 2

[0048] See appendix Figure 11 and 12Based on Embodiment 1, the difference from the embodiment is that the card sleeve 33 is U-shaped. The U-shaped card sleeve 33 can hang the main body 100 on the waist of pants or on a tool bag, which greatly improves the convenience of carrying the equipment, frees up the user's hands, and makes it easy to access the device at any time when working on the move or on site. In addition, the U-shaped card sleeve 33 has a simple and reliable structure, and the connection and separation operation with the waist is quick, which effectively improves work efficiency and reduces the risk of loss or damage to the detector due to random placement.

[0049] When using this invention, if abnormal sound is detected at the sound hole after prolonged use, the positioning plate 221 can be rotated by applying pressure with the palm of the hand. The rotation of the positioning plate 221 will cause the pressure block and the isolation gain film 225 to rotate simultaneously. After the locking block 224 of the positioning plate 221 rotates, it will disengage from the locking channel 213 of the chuck 211. Then the positioning plate 221 and the chuck 211 will separate, and the isolation gain film 22 can be removed. The isolation gain film 225 can be cleaned or the screws on the pressure ring 222 can be removed to disengage the pressure block from the positioning plate 221, and then the isolation gain film 225 can be removed and replaced. During installation, the locking block 224 and the fixing block of the positioning plate 221 are embedded into the guide channel 212 of the chuck 211. Then the positioning plate 221 is rotated so that the locking block 224 slides into the locking channel 213 along the guide channel 212, thus completing the installation.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A handheld VOCs detector with filtration function, characterized in that, include: The main body (100) has a sound-emitting hole on its back; The sound-emitting hole isolation gain mechanism (200) includes a positioning seat (21) detachably mounted to the body (100) and an isolation gain plate (22) detachably rotatably mounted to the positioning seat (21). An isolation gain film (225) is detachably mounted on the isolation gain plate (22) for isolating the internal sound-emitting cavity from the external atmosphere.

2. The handheld VOCs detector with filtering function according to claim 1, characterized in that, The isolation gain plate (22) includes an annular positioning disk (221) and a pressure ring (222). The positioning disk (221) is provided with an annular L-shaped groove. The isolation gain film (225) is embedded in the L-shaped groove and then pressed and limited by the pressure ring (222).

3. A handheld VOCs detector with filtering function according to claim 2, characterized in that, The positioning base (21) includes a ring-shaped chuck (211) with several guide channels (212) and locking channels (213) arranged in a ring. The guide channels (212) are fan-shaped grooves, and the locking channels (213) are U-shaped slots communicating with the fan-shaped channels. The bottom surface of the positioning disk (221) is provided with several fixed locking blocks (224) matching the number of locking channels (213). The fixed locking block (224) includes a fixed base (223) integrated with the positioning disk (221) and a locking block (224) connected to the fixed base (223) at one end. The other end of the locking block (224) is a free end, and the locking block (224) is inserted into the locking channel (213).

4. A handheld VOCs detector with filtering function according to claim 3, characterized in that, The isolation gain film (225) is made of ePTFE film.

5. A handheld VOCs detector with filtering function according to claim 4, characterized in that, The isolation gain film (225) is made of a filter screen.

6. A handheld VOCs detector with filtering function according to claim 5, characterized in that, The sum of the arc lengths of the fixed seat (223) and the locking block (224) is not greater than the arc length of the guide channel (212), and the thickness of the locking block (224) is not greater than the axial groove depth of the U-shaped groove of the locking channel (213).

7. A handheld VOCs detector with filtering function according to claim 6, characterized in that, The main body (100) is also equipped with a portable operating component (300), which includes a receiving channel (31) disposed on the main body (100) and a receiving seat (32) detachably mounted on a receiving base (32), the receiving base (32) being provided with a ferrule (33).

8. A handheld VOCs detector with filtering function according to claim 7, characterized in that, The receiving seat (32) is inserted into the receiving channel (31), and the cross-sections of the receiving channel (31) and the receiving seat (32) are both T-shaped or trapezoidal.

9. A handheld VOCs detector with filtering function according to claim 8, characterized in that, The inner wall of the sleeve (33) can be detachably fitted with a rubber layer.

10. A handheld VOCs detector with filtering function according to claim 9, characterized in that, The chuck (211) is detachably mounted to the body (100) by screws, and the pressure ring (222) is detachably mounted to the positioning plate (221) by screws.

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