Pumping and diffusing dual-purpose gas circuit structure on gas detector

Abstract

The utility model discloses a pumping and diffusing dual-purpose gas circuit structure on a gas detector. The pumping and diffusing dual-purpose gas circuit structure comprises a calibration cover assembly, a shell, a sensor assembly, a gas pipe bracket and a gas pump assembly, the calibration cover assembly is detachably connected with the shell; a plurality of air holes are formed in the shell; one end of the tracheal stent is communicated with the air hole of the shell, and the other end is communicated with the air pump assembly; the sensor assembly is arranged under the air hole. The air pump assembly is arranged below the sensor assembly; the calibration cover assembly comprises a filtering assembly, a rotating assembly, a calibration cover and an air chamber frame; the filtering assembly is arranged at one end of the calibration cover, and the air chamber frame is arranged in the calibration cover and arranged above the shell; one end of the rotating assembly penetrates through the calibration cover and the air chamber frame and then is detachably connected with the shell. According to the utility model, the pump suction mode and the diffusion mode can be freely switched, and the pump suction mode and the diffusion mode share the same calibration cover assembly for calibration, so that the consistency of the detection precision of the pump suction mode and the diffusion mode can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas detection instrument technical field, especially pump suction, diffusion dual -purpose gas path structure on gas detection instrument. BACKGROUND

[0002] In order to guarantee the normal of people's environment, will regularly detect the environment, and in order to detect the gas in the environment, relevant staff will carry portable gas detection instrument, it can quickly, accurately detect the toxic and harmful gas. Portable gas detection instrument detection generally has two ways: pump suction and natural diffusion.

[0003] Pump suction gas detection instrument gas path is widely recognized with fast and accurate detection mode, but air pump or intake gas path abnormal or failure, will lead to equipment can not be used, staff will be forced to interrupt or replace other equipment and carry out detection work, this also brings many troubles to the operating personnel. Natural diffusion gas detection instrument gas path also has the advantages of low power consumption and long operation time, and does not need to worry about gas path blockage in bad environment, but the detection speed is slow, the detection result error is large, and it cannot compare with pump suction gas detection instrument.

[0004] The present market gas detection instrument can only choose one of the two ways, such as to meet the pump suction and natural diffusion directly switch common, first need to ensure that the detection results of the two after switching are basically the same. Therefore, it is necessary to switch the pump suction and natural diffusion mode freely under the same calibration condition, and the advantages of pump suction and natural diffusion are perfectly combined together, so as to detect efficiently and conveniently, and ensure the stability of the product, which will be the blessing of the staff. Therefore, the present technology is developed. UTILITY MODEL CONTENTS

[0005] In view of the problems existing in the prior art, the utility model provides a pump suction and diffusion dual-purpose gas path structure on a gas detection instrument.

[0006] In order to realize the above purpose, the utility model technical scheme is as follows:

[0007] The utility model provides a pump suction and diffusion dual-purpose gas path structure on a gas detection instrument, which comprises:

[0008] The calibration cover assembly, the shell, the sensor assembly, the air pipe support and the air pump assembly are connected.

[0009] The calibration cover assembly and the shell are detachably connected.

[0010] A plurality of air holes are formed in the shell, one end of the air pipe support is communicated with the air holes of the shell, and the other end is communicated with the air pump assembly; the sensor assembly is arranged directly below the air holes; and the air pump assembly is arranged below the sensor assembly.

[0011] The calibration cover assembly comprises a filter assembly, a rotating assembly, a calibration cover and a gas chamber frame;

[0012] The filter assembly is arranged at one end of the calibration cover, and the gas chamber frame is arranged in the calibration cover and above the shell;

[0013] One end of the rotating assembly is detachably connected with the shell after penetrating through the calibration cover and the gas chamber frame, and when the diffusion mode is used, the calibration cover assembly needs to be detached from the shell.

[0014] Preferably, a sealed gas path is formed between the calibration cover and the gas chamber frame, and a serial gas path is formed between the gas chamber frame and the shell.

[0015] Preferably, the sensor assembly comprises a sensor PCB and a plurality of electrochemical sensors arranged on the sensor PCB.

[0016] Preferably, a rubber pad is further arranged on each electrochemical sensor and abuts against the shell, so as to ensure the sealed contact between the shell and the electrochemical sensor.

[0017] Preferably, an air inlet pipe and an air outlet pipe are arranged at one end of the calibration cover, and a rotating assembly mounting position is arranged in the middle of the calibration cover.

[0018] One end of the filter assembly is communicated with the air inlet pipe, and the rotating assembly is arranged in the middle of the calibration cover.

[0019] Preferably, the filter assembly comprises a hydrazine hydrate filter, and one end of the hydrazine hydrate filter is communicated with the air inlet pipe.

[0020] Preferably, the rotating assembly comprises a knob, the knob is arranged in the middle of the calibration cover, and one end of the knob is connected with the shell through a thread.

[0021] Preferably, the air pump assembly comprises an air pump cover and an air pump arranged on the air pump cover, and the air pipe support is communicated with the air hole on the air pump cover.

[0022] Preferably, the air pump cover is arranged at the bottom of the sensor PCB.

[0023] The technical scheme of the utility model has the following beneficial effects:

[0024] The utility model discloses a pump suction type and diffusion type share same calibration cover assembly and carry out calibration, can ensure that the detection precision of both is consistent, through the knob, pump suction type and diffusion type two modes are conveniently switched, and installation replacement efficiency is effectively improved, by using the structure on the gas chamber frame, through the knob metal thread, the sealed gas path of firm is assembled, realizes the gas path series connection between multiple sensors in pump suction type. The detachable connection design of calibration cover assembly and shell makes maintenance and cleaning more convenient, reduces the maintenance time and cost of equipment.

[0025] The tracheal support ensures the air path communication between the air pump cover and the shell, maintains the integrity of the air path; the water filter removes impurities in the gas, ensures that the gas sample received by the electrochemical sensor is pure, and improves the accuracy of detection. The design of the knob allows the user to easily fix or disassemble the calibration cover assembly, realizing the quick switching between the pump suction type and the diffusion type. Multiple electrochemical sensors enable the device to detect multiple gases, improving the versatility of the device. The design of the rubber pad ensures the airtight contact between the shell and the electrochemical sensor, prevents gas leakage, and enhances the sealing of the air path. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 The utility model structural schematic drawing is shown in the figure;

[0027] Fig. 2 The utility model structural schematic drawing is shown in the figure;

[0028] Fig. 3 The utility model schematic diagram that forms has series air path between air chamber frame and shell. DETAILED DESCRIPTION

[0029] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model.

[0030] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model.

[0031] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0032] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] Reference Figs. 1 to 3 The utility model provides a dual-purpose gas path structure for pumping and diffusion on a gas detector, comprising:

[0035] Calibration cover assembly 12, housing 5, sensor assembly, trachea bracket 11, air pump assembly;

[0036] The calibration cover assembly 12 is detachably connected to the shell 5. This design allows the user to easily remove the calibration cover assembly from the shell as needed for cleaning, maintenance or replacement. At the same time, when using the diffusion mode, the calibration cover assembly 12 needs to be removed from the shell 5 so that the sensor assembly is directly exposed to the external environment for natural diffusion gas detection. The shell is used to fix the support frame of the entire dual-purpose gas path, providing the necessary structural stability and protection to ensure that the gas path assembly can work stably in various environments.

[0037] The shell 5 is provided with a plurality of air holes, which provide a channel for gas flow. The design of the air holes allows smooth passage of gas through the gas path system, thereby improving the efficiency and accuracy of gas detection. The air pipe support 11 is in communication with the air holes of the shell 5 at one end and with the air pump assembly at the other end. It serves as part of the gas path, ensuring effective flow of gas between the air pump assembly and the shell 5. The sensor assembly is placed directly below the air holes. This layout allows the sensor assembly to directly contact the filtered and regulated gas, thereby enabling accurate gas detection. The air pump assembly is arranged below the sensor assembly. The air pump assembly is responsible for drawing air from the detection area and delivering it to the sensor for detection. This pump suction type detection method can quickly and accurately detect toxic and harmful gases. The arrangement of the air pump assembly enables the gas detector to work in harsh environments, even if the gas path is blocked, and maintains normal detection function.

[0038] The calibration cover assembly 12 includes a filter assembly 1, a rotating assembly 2, a calibration cover 3, and a gas chamber support 4.

[0039] The filter assembly 1 is arranged at one end of the calibration cover 3, and the gas chamber support 4 is arranged inside the calibration cover and above the shell 5. The main function of the filter assembly 1 is to filter the gas entering the calibration cover, removing impurities such as water vapor and dust that may affect the detection results, thereby ensuring that the gas sample received by the sensor is pure and ensuring the accuracy of the detection results.

[0040] The rotating assembly 2 is detachably connected to the shell 5 after passing through the calibration cover 3 and the gas chamber support 4. In the diffusion mode, the calibration cover assembly needs to be detached from the shell to expose the sensor assembly directly to the external environment for natural diffusion type gas detection. The gas chamber support 4 is used in the pump suction mode to assemble with the shell 5 and the calibration cover 3 to form a gas path. In the pump suction mode, the gas chamber support 4 ensures smooth flow of gas from the filter assembly 1 to the sensor assembly. In the diffusion mode, the gas chamber support 4 also helps to protect the internal components from damage caused by the external environment. In summary, the design and layout of the calibration cover assembly 12 and its sub-assemblies enable the gas detector to switch between pump suction and diffusion modes flexibly, while ensuring the accuracy of gas detection and the stability of the equipment. In the pump suction mode, the calibration cover assembly 12 provides a closed and controlled environment for precise control of gas sample flow and detection. In the diffusion mode, by detaching the calibration cover assembly 12, the sensor assembly can directly contact the external environment for natural diffusion type gas detection. This design improves the applicability and flexibility of the gas detector, allowing it to adapt to different detection environments and needs.

[0041] Further, a sealed gas path is formed between the calibration cover 3 and the gas chamber frame 4. The sealed gas path between the calibration cover 3 and the gas chamber frame 4 ensures that the gas sample remains pure and is not disturbed by the external environment before entering the sensor assembly. This sealed design prevents gas leakage, ensuring the integrity of the gas sample and the accuracy of the detection results. The design of the sealed gas path also helps to protect the internal components from moisture, dust and other contaminants, thereby extending the service life of the equipment and reducing maintenance requirements. In the pumping mode, the sealed gas path allows precise control of the gas flow, ensuring that the gas sample flows directly from the calibration cover 3 to the gas chamber frame 4 and then to the sensor assembly, which helps to improve the response speed and sensitivity of the detection.

[0042] A series gas path 20 is formed between the gas chamber frame 4 and the housing 5. The series gas path design between the gas chamber frame 4 and the housing 5 allows multiple sensor assemblies to share the same gas path, which enables the gas sample to be detected by multiple sensors in sequence, thereby improving the detection capability and efficiency of the equipment. The design of the series gas path 20 also helps to reduce the overall size and weight of the gas detector, as it allows multiple sensors to share a gas path rather than designing a separate gas path for each sensor. In the pumping mode, the series gas path 20 ensures that the gas sample can pass through each sensor in sequence along a predetermined path after being drawn in by the gas pump assembly, which helps to achieve continuous monitoring of multiple gases. In addition, the design of the series gas path 20 also improves the flexibility of the gas detector, as it allows sensors to be added or removed as needed without the need to redesign the entire gas path system.

[0043] Further, the sensor assembly includes a sensor PCB board 8 and multiple electrochemical sensors 7 arranged on the sensor PCB board 8. The multiple electrochemical sensors 7 can simultaneously detect multiple different gases, improving the versatility and flexibility of the gas detector to adapt to various detection requirements and environmental conditions.

[0044] Further, each electrochemical sensor 7 is also provided with a rubber pad 6 that abuts the housing 5 to ensure airtight contact between the housing 5 and the electrochemical sensor 7. This design prevents gas leakage, ensuring the airtightness of the gas path, thereby ensuring that the gas sample is not disturbed by the external environment before entering the sensor. The elastic properties of the rubber pad 6 allow it to adapt to minor irregularities between the sensor and the housing, providing uniform sealing pressure and ensuring long-term stable sealing effect. The rubber pad 6 not only provides sealing, but also protects the electrochemical sensor 7 from physical impact and vibration, especially when the gas detector is used in harsh environments.

[0045] Further, one end of the calibration cover 3 is provided with an air inlet pipe and an air outlet pipe, and the middle part of the calibration cover 3 is provided with a rotating component mounting position; one end of the filtering component 1 is communicated with the air inlet pipe; and the rotating component 2 is arranged in the middle part of the calibration cover 3. The filtering component 1 comprises a hydrazine filter, and one end of the hydrazine filter is communicated with the air inlet pipe. This design ensures that the gas entering the calibration cover is first filtered by the hydrazine filter to remove impurities such as moisture and dust that may affect the detection result. The rotating component 2 comprises a knob arranged in the middle part of the calibration cover 3, which is convenient for the user to operate. The knob can be used to fix the calibration cover and switch the working mode of the gas detector. One end of the knob is connected with the shell 5 through threads. The quick mode switching realized by the knob improves the use convenience and working efficiency of the equipment, and enables the operator to quickly adjust the working state of the equipment according to the actual situation

[0046] Further, the gas pump assembly comprises a gas pump cover 10 and a gas pump 9 arranged on the gas pump cover 10; the air pipe support 11 is communicated with the air hole on the gas pump cover 10; and the gas pump cover 10 is arranged at the bottom of the sensor PCB 8. The design of the gas pump assembly enables the gas detector to work in the pumping mode. The gas pump 9 is responsible for sucking the air sample and conveying it to the electrochemical sensor for analysis. The pumping type detection mode can quickly and accurately detect the toxic and harmful gas. The arrangement of the gas pump 9 enables the gas detector to maintain normal detection function even in the case of possible blockage of the gas path when working in a harsh environment.

[0047] The working principle of the utility model is as follows:

[0048] Pumping type working principle:

[0049] Gas pump front gas path: the gas enters from the hydrazine filter, passes through the sealed gas path formed by the calibration cover 3 and the air chamber support 4, enters the air pipe support 11, and then enters the gas pump cover 10. The gas pump cover 10 is communicated with the gas pump 9, and the gas pump cover 10 plays a role in fixing the gas pump 9.

[0050] Gas pump rear gas path: the gas flowing out of the gas pump 9 enters the other end of the air pipe support 11 through the gas pump cover 10, and then the gas sequentially passes through the existing series gas path 20 of the shell 5 and the air chamber support 4, enters the electrochemical sensor 7 to generate an electric signal, and the sensor PCB 8 analyzes the electric signal to realize the function. A plurality of electrochemical sensors 7 meet the test. After the gas passes through the nearest electrochemical sensor 7, it enters the sealed gas path formed by the air chamber support 4 and the calibration cover 3, and is discharged.

[0051] Diffusion type working principle:

[0052] By rotating the knob, the calibration cap assembly 12 is removed from the housing 5, and the electrochemical sensor 7 is directly exposed to the outside through the air hole in the housing 5, thereby forming a diffusion type gas test.

[0053] The above merely describes the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation or direct / indirect application in other related technical fields under the inventive concept of the present application, as described in the present application and the drawings, is included in the patent protection scope of the present application.

Claims

1. A dual-purpose gas path structure for pumping and diffusion on a gas detector, characterized in that: include: Calibration cover assembly, housing, sensor assembly, trachea bracket, air pump assembly; The calibration cover assembly is detachably connected to the housing; The shell is provided with a plurality of air holes; one end of the trachea bracket is connected to the air holes of the shell, and the other end is connected to the air pump assembly; the sensor assembly is placed directly below the air holes; the air pump assembly is arranged below the sensor assembly; The calibration cover assembly includes a filter assembly, a rotating assembly, a calibration cover, and an air chamber frame; The filter assembly is arranged at one end of the calibration cover, and the air chamber frame is arranged in the calibration cover and placed above the housing; One end of the rotating assembly passes through the calibration cover and the air chamber frame and is detachably connected to the shell. When the diffusion mode is used, the calibration cover assembly needs to be removed from the shell.

2. The pumping and diffusion dual-purpose gas path structure on the gas detector according to claim 1 is characterized in that: A sealed air path is formed between the calibration cover and the air chamber frame; and a series air path is formed between the air chamber frame and the shell.

3. The dual-purpose gas path structure for pumping and diffusion on the gas detector according to claim 1 is characterized in that: The sensor assembly includes a sensor PCB board and a plurality of electrochemical sensors arranged on the sensor PCB board.

4. The dual-purpose gas path structure for pumping and diffusion on the gas detector according to claim 3 is characterized in that: Each of the electrochemical sensors is further provided with a rubber pad, which abuts against the housing to ensure airtight contact between the housing and the electrochemical sensor.

5. The pumping and diffusion dual-purpose gas path structure on the gas detector according to claim 2 is characterized in that: An air inlet pipe and an air outlet pipe are provided at one end of the calibration cover, and a rotating component installation position is provided in the middle of the calibration cover; One end of the filter assembly is communicated with the air inlet pipe; and the rotating assembly is arranged in the middle of the calibration cover.

6. The dual-purpose gas path structure for pumping and diffusion on the gas detector according to claim 5 is characterized in that: The filter assembly comprises a water hydrazine filter, one end of which is communicated with the air intake pipe.

7. The dual-purpose gas path structure for pumping and diffusion on the gas detector according to claim 5 is characterized in that: The rotating assembly includes a knob, which is arranged in the middle of the calibration cover, and one end of the knob is connected to the shell through a thread.

8. The pumping and diffusion dual-purpose gas path structure of the gas detector according to claim 3 is characterized in that: The air pump assembly includes an air pump cover and an air pump arranged on the air pump cover; the trachea bracket is communicated with the air hole on the air pump cover.

9. The dual-purpose gas path structure for pumping and diffusion on the gas detector according to claim 8, characterized in that: The air pump cover is arranged at the bottom of the sensor PCB board.

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