VOCs gas detector

Abstract

The VOCs gas detector comprises a detection body and a shell, the detection body comprises a gas introduction assembly and a sensor module, the gas introduction assembly comprises a plurality of first gas flow channels and a plurality of second gas flow channels which are connected, the first gas flow channels are distributed in different directions, and the second gas flow channels are distributed in different directions. The second gas flow channel is close to or connected with the sensor module; after a gas sample reaches the sensor module through the gas introduction assembly, the sensor module detects and analyzes the gas sample; the detection body is arranged in the shell, at least one circle of air inlet position is arranged in the circumferential direction of the shell, and a plurality of openings matched with the end of the first air flow channel are formed in the air inlet position. According to the detector, the gas inlet flow channels are formed in multiple directions, so that a collected gas sample can fully and rapidly enter the detection body for detection, and the situation that a detection result is inaccurate due to rapid change of operation and environmental gas is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas detection equipment, in particular to a VOCs gas detector. BACKGROUND

[0002] The VOC gas detector is an instrument for detecting the concentration of volatile organic compounds (Volatile Organic Compounds, referred to as VOC). VOC is a common organic compound that can easily volatilize at room temperature, such as benzene, toluene, xylene, formaldehyde, ethanol, etc. These compounds exist in various occasions such as industrial production, indoor decoration, automobile exhaust, etc., and may cause harm to human health and the environment, so professional detection instruments are needed to monitor their concentration.

[0003] The existing gas detector is mostly a probe type sampling, which is inconvenient to store and carry in structure, and also needs to consider the protection design of the probe; more importantly, in some specific detection environment, the probe sampling may be limited by the structure, the direction of collecting gas samples is single, the diffusion process of gas into the instrument is slow, the response is long, and the change of gas in the environment cannot be fully and quickly captured, which affects the accuracy, authenticity and effectiveness of the detection result. CONTENT OF THE INVENTION

[0004] The main purpose of the present application is to provide a VOCs gas detector, which mainly solves the problem that the existing gas detector is easy to produce local data deviation when detecting gas data.

[0005] To achieve the above purpose, the present application provides a VOCs gas detector, which comprises:

[0006] A detection body, the detection body comprises a gas introduction assembly and a sensor module, the gas introduction assembly comprises a plurality of first gas flow channels and a second gas flow channel in a connecting relationship, a plurality of the first gas flow channels are distributed in different directions, and the second gas flow channel is close to or connected to the sensor module; after the gas sample reaches the sensor module through the gas introduction assembly, the sensor module detects and analyzes the gas sample;

[0007] A shell, the detection body is arranged in the interior of the shell, and at least one gas inlet position is arranged on the circumference of the shell, and a plurality of openings matched with the end of the first gas flow channel are arranged on the gas inlet position.

[0008] For example, in the VOCs gas detector provided by at least one embodiment of the present application, each first gas flow channel is connected to the second gas flow channel through a blending chamber, and the connection distance between the first gas flow channel and the blending chamber is shorter than the connection distance between the second gas flow channel and the blending chamber.

[0009] For example, in the VOCs gas detector provided by at least one embodiment of the present application, the inner diameter of each first gas flow channel gradually shrinks from the end close to the gas inlet position to the end close to the blending chamber, and the inner diameter of the second gas flow channel gradually expands from the end close to the blending chamber to the end close to the sensor module.

[0010] For example, in the VOCs gas detector provided by at least one embodiment of the present application, a Venturi structure composed of a contraction section, a throat and a diffusion section is arranged on the second gas flow channel in the gas sample flow direction, and a plurality of gas guide through holes are arranged on the end close to the diffusion section of the second gas flow channel in the circumferential direction.

[0011] For example, in the VOCs gas detector provided by at least one embodiment of the present application, the sensor module is arranged in the detection chamber and includes a plurality of sensors, and the plurality of sensors are correspondingly distributed outside the plurality of gas guide through holes in an array.

[0012] For example, in the VOCs gas detector provided by at least one embodiment of the present application, the gas inlet position is arranged on the shell through an inner groove structure, and a plurality of guide plates are further arranged on the outer layer of the shell at the position corresponding to the gas inlet position, so that the gas sample enters the gas inlet position in a fixed direction.

[0013] For example, in the VOCs gas detector provided by at least one embodiment of the present application, the plurality of guide plates are integrally arranged on the shell to rotate, so that the direction of the gas sample entering the gas inlet position is adjustable.

[0014] For example, in the VOCs gas detector provided by at least one embodiment of the present application, a filter is arranged on each first gas flow channel to filter solid impurities in the gas sample.

[0015] For example, in the VOCs gas detector provided by at least one embodiment of the present application, a rotating seat is arranged at the bottom of the shell, and the rotating seat drives the shell to rotate to uniformly guide the gas into the gas guiding assembly.

[0016] The VOCs gas detector has at least the following beneficial effects: by arranging at least one gas inlet position and a distributed multi-directional first gas flow channel in the circumferential direction of the shell, a multi-directional flow sampling channel is formed, compared with the traditional single-direction probe structure, full-angle gas collection can be realized, the gas capture efficiency in complex environment is significantly improved, and the advantages are obvious especially in the scene where air flowability is poor or there is a gas concentration gradient; secondly, the multi-channel parallel gas inlet structure enables the gas sample to enter the flow channel system from multiple directions at the same time, shortens the path length of the gas to the sensor module, and the average response time can be significantly shortened compared with the single-point gas inlet mode; in addition, the multi-directional flow channel gas inlet sampling structure can avoid the local data deviation caused by the single sampling direction of the traditional single-direction probe, thereby improving the representativeness of the detection data, and the detection result is more real. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of 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 in the following description are only 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 the drawings shown.

[0018] Figure 1 It is an overall schematic diagram of an embodiment of the VOCs gas detector of the present application.

[0019] Figure 2 It is a sectional view of an embodiment of the VOCs gas detector of the present application.

[0020] Figure 3 It is a sectional view of an embodiment of the VOCs gas detector of the present application.

[0021] Figure 4 It is a structural schematic diagram of the second gas flow channel part of an embodiment of the VOCs gas detector of the present application.

[0022] Reference signs: 10, gas inlet assembly; 101, first gas flow channel; 102, second gas flow channel; 1021, gas guide through hole; 103, blending chamber; 20, sensor module; 201, sensor; 30, detection chamber; 40, gas inlet position; 50, flow guide plate; 60, rotating seat.

[0023] The implementation, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0026] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] In addition, if the present application embodiments involve "first", "second" and the like, the "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously meet the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that those skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0028] The VOCs gas detector is a commonly used gas detection device, and its main working process is to collect environmental gas and react or act with the internal sensor to realize the determination of concentration or composition data. Common gas detectors collect environmental gas through a probe, which is convenient to operate and has high sensitivity, but also has certain shortcomings, such as sampling range concentrated in points, poor adaptability to complex environment. For scenes with fast instantaneous change and complex environmental gas, it is difficult to provide effective and high-fidelity data.

[0029] Based on the deficiencies of the existing gas detector, the application provides a VOCs gas detector, which comprises a detection body and a shell Figure 1 and Figure 2 The detection body comprises a gas introduction assembly 10 and a sensor module 20. The gas introduction assembly 10 comprises a plurality of first gas flow channels 101 and a second gas flow channel 102 in a connecting relationship. The plurality of first gas flow channels 101 are distributed in different directions, and the second gas flow channel 102 is close to or connected to the sensor module 20. After the gas sample passes through the gas introduction assembly 10 to reach the sensor module 20, the sensor module 20 detects and analyzes the gas sample. The shell has at least one gas inlet position 40 arranged on the circumference of the shell, and a plurality of openings matched with the end of the first gas flow channel 101 are arranged on the gas inlet position 40.

[0030] When the gas detector of the application is used for environmental gas sampling, the gas sample does not need to enter the instrument through a single-point probe, but enters from different directions through a plurality of first gas flow channels 101, thereby improving the richness of the sampled gas in a specific space environment. Taking the concentration index as an example, in a space where gas diffusion is uneven, there may be a gradient distribution of concentration. The gas concentration detected by the probe-type detector has strong limitations, and the data fluctuates with the change of the space position, and cannot fully diffuse the real concentration of the gas in the region. The gas detector of the application receives the diffused gas in multiple directions, mixes in the instrument, and is closer to the final real concentration of the space.

[0031] For example, in the gas detector shown in Figure 1 , the first gas flow channel 101 is provided as four, which respectively collects samples in four directions. The shell has openings corresponding to each first gas flow channel 101, which can protect the detection body after installation and meet the needs of multi-directional sampling. The first gas flow channel 101 can also be provided more, and the openings of the gas inlet position 40 can also be correspondingly provided, which is not limited in the embodiment.

[0032] It should be noted that the application aims to improve the structure of the gas detector to optimize sample collection, and involves the detection process and principle of different gases, which should be understood by those skilled in the art as prior art in the application.

[0033] In the VOCs gas detector provided in at least one embodiment of the application, as shown in Figure 2 and Figure 3 , each first gas flow channel 101 is connected to the second gas flow channel 102 through a blending chamber 103, and the connection distance between the first gas flow channel 101 and the blending chamber 103 is shorter than the connection distance between the second gas flow channel 102 and the blending chamber 103.

[0034] In the embodiment, the first gas flow channel 101 and the second gas flow channel 102 are connected through the blending chamber 103, so that the gases collected in different directions can be fully mixed, and the diffusion effect between gases with different concentrations can be achieved. Compared with the data detected at a specific position, the data state of the mixed gas is more consistent with the data state in the overall environment. The blending chamber 103 can be provided in the form of a cavity, and the specific shape can be adaptively designed according to the needs, and the volume is ensured to be as large as possible to achieve full mixing.

[0035] Additionally, in combination with Figure 2 and Figure 3 In some embodiments, the connection distances of the first gas flow channel 101, the second gas flow channel 102 and the blending chamber 103 are not the same, the first gas flow channel 101 is shorter, and the second gas flow channel 102 is longer. In actual use, the shorter first gas flow channel 101 can accelerate the multi-directional gas into the blending chamber 103 for mixing, and the longer second gas flow channel 102 prolongs the flow path of the mixed gas, which is beneficial to maintaining the process stability when contacting and reacting with the sensor module 20.

[0036] In particular, in the embodiment, in order to improve the flow efficiency of the gas into the instrument and reduce the resistance and turbulence when the gas enters, the inner diameter of each first gas flow channel 101 from the end close to the air inlet position 40 to the end close to the blending chamber 103 can be gradually reduced, and the inner diameter of the second gas flow channel 102 from the end close to the blending chamber 103 to the end close to the sensor module 20 can be gradually increased, so as to change the pressure of the gas in the first gas flow channel 101 and the second gas flow channel 102, guide the gas to enter and adjust the flow rate. The inner diameter and flow cross section of the first gas flow channel 101 gradually decrease from outside to inside, and the flow rate increases, which is helpful for the gas to fully enter. Similarly, the inner diameter and flow cross section of the second gas flow channel 102 gradually increase from the blending chamber 103 to the side of the sensor module 20, and the flow rate decreases, so that the gas can stably contact, react and act with the sensor module 20, which can improve the reliability and authenticity of the detection data.

[0037] In the VOCs gas detector provided in at least one embodiment of the present application, in combination with Figure 3 and Figure 4 The second gas flow channel 102 is provided with a Venturi structure composed of a contraction section, a throat and a diffusion section in the gas sample flow direction. A plurality of gas guide through holes 1021 are formed in the end of the second gas flow channel 102 close to the diffusion section. The second gas flow channel 102 is a transmission channel for the mixed gas to react with the sensor, and the Venturi effect is used to drive the gas to flow stably in the direction of the sensor module 20 to ensure smooth flow and prevent backflow. The gas guide through holes 1021 are arranged in the end of the second gas flow channel 102 in the circumferential direction, which can reduce the end flow rate and enable the gas to react with the sensor module 20 stably and fully.

[0038] In some embodiments, the arrangement of the gas guiding through holes 1021 can also improve the response speed of the sensor. For example, the sensor module 20 is arranged in the detection chamber 30, the sensor module 20 includes a plurality of sensors, the plurality of sensors 201 are arranged in an array corresponding to the outside of the plurality of gas guiding through holes 1021, and the plurality of sensors 201 directly contact and react with the gas sample at a minimum distance, the data change of each sensor 201 and a period of time is detected, and finally the result is fitted by an algorithm or a program, and the error rate is smaller.

[0039] In the VOCs gas detector provided in at least one embodiment of the present application, as shown in Figure 1 , the gas inlet position 40 is arranged on the shell through an inner groove structure, and the shell is further provided with a plurality of guide plates 50 at the outer position corresponding to the gas inlet position 40, so that the gas sample enters the gas inlet position 40 in a fixed direction. The guide plates 50 arranged at intervals and having a certain inclination angle make the gas in the external environment enter the first gas flow channel 101 in the same direction. In a non-flowing gas environment, the sampling process can generate gas flow by rotating the gas detector, and the gas is smoothly collected under the action of the guide plates 50.

[0040] Further, in order to facilitate the use of the gas detector and improve the flexibility of gas sampling, the plurality of guide plates 50 are integrally arranged on the shell to rotate, so that the direction of the gas sample entering the gas inlet position 40 is adjustable. When in use, the angle of the guide plates 50 on the shell is adjusted by turning, which can not only adjust the gas inlet direction to improve the sampling efficiency, but also control the gas inlet amount to adapt to the detection in different environments.

[0041] In the VOCs gas detector provided in at least one embodiment of the present application, a filter (not shown in the figure) is arranged on each first gas flow channel 101 to filter solid impurities in the gas sample, so as to avoid the deposition of the solid impurities in the instrument to affect the use effect and service life of the equipment.

[0042] In particular, in any of the foregoing embodiments, the shell of the VOCs gas detector can be provided with a rotating seat 60, and the shell is rotated by the rotating seat 60 to uniformly guide the gas into the gas guiding assembly 10. When in use, the gas detector is rotated and the gas sample is collected by artificial or natural gas flow pressure difference in the environment. This sampling form can accelerate the gas flow and guide the gas into the instrument, and can improve the mixing efficiency of the gas sample, that is, the sample is collected and mixed at the same time, thereby improving the detection effect.

[0043] The above description is only an optional embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A VOCs gas detector, characterized in that, include: The detection body includes a gas introduction component and a sensor module. The gas introduction component includes multiple first gas channels and second gas channels that are connected to each other. The multiple first gas channels are distributed in different directions, and the second gas channels are close to or connected to the sensor module. After the gas sample reaches the sensor module through the gas introduction component, the sensor module detects and analyzes the gas sample. The housing has the detection body disposed inside it. The housing has at least one ring of air inlets in its circumferential direction, and the air inlets have a plurality of openings that match the ends of the first gas flow channel.

2. The VOCs gas detector according to claim 1, characterized in that, Each of the first gas channels is connected to the second gas channel via a mixing chamber, and the connection distance between the first gas channel and the mixing chamber is shorter than the connection distance between the second gas channel and the mixing chamber.

3. The VOCs gas detector according to claim 2, characterized in that, The inner diameter of each of the first gas channels gradually narrows from the end near the air inlet to the end near the mixing chamber, while the inner diameter of the second gas channels gradually widens from the end near the mixing chamber to the end near the sensor module.

4. The VOCs gas detector according to claim 1, characterized in that, The second gas flow channel is provided with a Venturi structure consisting of a contraction section, a throat, and a diffusion section along the gas sample flow direction. Several gas guide holes are opened circumferentially at one end of the second gas flow channel near the diffusion section.

5. The VOCs gas detector according to claim 4, characterized in that, The sensor module is installed in the detection chamber and includes multiple sensors, which are distributed in an array on the outside of several air passages.

6. The VOCs gas detector according to claim 1, characterized in that, The air intake is provided on the housing through an inner groove structure. The housing is also provided with several guide plates on the outer layer corresponding to the air intake, so that the gas sample enters the air intake in a fixed direction.

7. The VOCs gas detector according to claim 1, characterized in that, Several guide vanes are integrally rotatably mounted on the housing, making the direction in which the gas sample enters the air inlet adjustable.

8. The VOCs gas detector according to claim 1, characterized in that, Each of the first gas channels is equipped with a filter element to filter solid impurities in the gas sample.

9. The VOCs gas detector according to claim 1, characterized in that, The bottom of the housing is provided with a rotating seat, which drives the housing to rotate so that the gas introduction component can evenly introduce gas.

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