Flow-limiting pressurizing gas chamber structure of pump suction type portable gas detector

Abstract

The utility model discloses a flow-limiting pressurizing air chamber structure of a pump suction type portable air detector. The flow-limiting pressurizing air chamber structure comprises an upper shell, an air pipe support, an air pump cover, a waterproof filtering assembly, a support sealing assembly, a pressure limiting sleeve, a sealing piece, an air pressure sensor and a lower shell matched with the upper shell. One end of the air pipe bracket is communicated with the upper shell, and the other end is communicated with the air pump cover; the waterproof filtering assembly is arranged in the air pipe support. The support sealing assembly is arranged between the air pipe support and the upper shell and used for guaranteeing that the air pipe support makes airtight contact with the upper shell. The air pump cover is arranged in the lower shell, a buffering cavity is formed in the air pump cover, the pressure limiting sleeve is arranged in the buffering cavity, and a flow limiting hole is formed in the pressure limiting sleeve and used for increasing the pressure of the buffering cavity; the sealing piece is arranged at the bottom of the air pump cover, abuts against the lower shell and is used for sealing the buffering cavity of the air pump cover. Pressurization is achieved through flow limiting, and then the flow speed is adjusted through pressure feedback.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas detection instrument technical field, especially pump suction formula portable gas detection instrument's flow limiting pressure increasing gas chamber structure. BACKGROUND

[0002] The flow of the air pump is usually fixed when the existing pump suction type portable gas detection instrument is designed. However, there are differences in the demand for detecting gas flow due to different gas sensor manufacturers and different gas characteristics. In addition, the demand for detecting flow will also be affected by different test environments, for example, under the condition of high dust and high humidity, the flow often needs to be increased to ensure the accuracy of the test due to the existence of the filter membrane. Therefore, the existing pump suction type portable gas detection instrument cannot adjust the air pump flow according to the actual situation, which limits its applicability and accuracy in different environments and different gas detection. SUMMARY

[0003] In view of the problems existing in the prior art, the utility model provides a pump suction type portable gas detection instrument's flow limiting pressure increasing gas chamber structure.

[0004] In order to achieve the above purpose, the utility model technical scheme is as follows:

[0005] The utility model provides a pump suction type portable gas detection instrument's flow limiting pressure increasing gas chamber structure, which comprises: an upper shell, an air pipe support, an air pump cover, a waterproof filter assembly, a support sealing assembly, a pressure limiting sleeve, a sealing element, an air pressure sensor, and a lower shell matched with the upper shell.

[0006] One end of the air pipe support is in communication with the upper shell, and the other end is in communication with the air pump cover; the waterproof filter assembly is arranged in the air pipe support.

[0007] The support sealing assembly is arranged between the air pipe support and the upper shell, and is used for ensuring that the air pipe support and the upper shell are in sealed contact.

[0008] The air pump cover is arranged in the lower shell, the air pump cover is provided with a buffer cavity, the pressure limiting sleeve is arranged in the buffer cavity, and a flow limiting hole is formed in the pressure limiting sleeve to increase the pressure of the buffer cavity.

[0009] The sealing element is arranged at the bottom of the air pump cover and abuts against the lower shell, and is used for sealing the buffer cavity of the air pump cover.

[0010] The buffer cavity side is provided with a hole for mounting the air pressure sensor.

[0011] Preferably, the pump suction type portable gas detection instrument's flow limiting pressure increasing gas chamber structure further comprises a calibration cover assembly, a sensor assembly, and an air pump arranged on the air pump cover.

[0012] The calibration cover assembly is detachably connected with the upper shell and forms a pump air inlet with the surface of the upper shell.

[0013] A plurality of air holes are formed in the upper shell; one end of the air pipe support is in communication with the air holes of the upper shell, and the other end is in communication with the air pump cover; the sensor assembly is arranged directly below the air holes; the air pump cover and the air pump are arranged below the sensor assembly.

[0014] Preferably, the calibration cover assembly comprises a filter assembly, a rotating assembly and a calibration cover.

[0015] The filter assembly is arranged at one end of the calibration cover, and one end of the rotating assembly passes through the calibration cover and is detachably connected with the upper shell.

[0016] Preferably, the sensor assembly comprises a sensor PCBA board and a plurality of electrochemical sensors arranged on the sensor PCBA board; the corresponding ends of the sensor PCBA board are electrically connected with the corresponding ends of the plurality of electrochemical sensors and the air pressure sensor.

[0017] Preferably, a sensor sealing rubber pad is further arranged on each electrochemical sensor, and the sensor sealing rubber pad abuts against the upper shell to ensure that the upper shell and each electrochemical sensor are in sealed contact.

[0018] Preferably, one end of the calibration cover is provided with an air inlet pipe and an air outlet pipe, and a rotating assembly mounting position is arranged in the middle of the calibration cover; one end of the filter assembly is in communication 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 water hydrazine filter, and one end of the water hydrazine filter is in communication with the air inlet pipe.

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

[0021] Preferably, the waterproof filter assembly is a waterproof filter membrane.

[0022] Preferably, the support sealing assembly is a support sealing ring, and the sealing member is a sealing cover.

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

[0024] The pressure limiting sleeve increases the pressure of the buffer cavity through the flow limiting hole, detects the pressure size through the air pressure sensor, transmits the signal to the PCBA board, controls the working current of the air pump 16 through the data analysis of the PCBA board, so as to control the gas flow rate; the air pump cover has a separate buffer cavity for buffering and stabilizing the flow fluctuation when the air pump works, improving the airflow stability and the accuracy of the measured gas.

[0025] Adjustable flow: The utility model discloses a flow limiting and pressure increasing chamber structure, allows user to adjust the flow of gas pump according to different sensor manufacturers, gas types and test environment, thereby improve the applicability and flexibility of equipment;Through the flow limiting and pressure increasing and pressure feedback mechanism, the gas flow rate and pressure can be accurately controlled, and accurate detection results can be obtained under different conditions.

[0026] Strong environmental adaptability: The utility model can adapt to harsh environments such as high dust and high humidity, and ensure the accuracy of detection by adjusting the flow, thereby expanding the application range of the gas detector.

[0027] Improved sealing performance: The use of support sealing assembly and sealing element ensures the airtight contact between the air pipe support and the upper shell, the air pump cover and the lower shell, prevents gas leakage, and enhances the sealing performance and durability of the equipment.

[0028] Waterproof and dustproof function: The waterproof filter assembly is arranged, especially in the air pipe support, which provides additional waterproof and dustproof protection, so that the equipment can work normally in harsh environment, and the service life of the equipment is prolonged.

[0029] Pressure monitoring and feedback: The buffer cavity side is provided with a hole for installing a gas pressure sensor, which can monitor the pressure change in the buffer cavity in real time, and adjust the working state of the air pump through the feedback mechanism to realize accurate control.

[0030] Modular design: The detachable connection design of the calibration cover assembly and the upper shell facilitates users to replace or maintain the calibration cover assembly according to needs, improves the flexibility and maintenance convenience of the equipment.

[0031] Sensor protection: A sensor sealing rubber pad is arranged on each electrochemical sensor and abuts against the upper shell, which ensures the airtight contact between the sensor and the upper shell, prevents gas leakage, and protects the sensor from environmental influences. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 The utility model structural schematic diagram is shown in the figure;

[0033] Fig. 2 The utility model structure explosion map is shown in the figure;

[0034] Fig. 3 The utility model lower shell, air pump cover, pressure limiting sleeve, sealing element structure schematic diagram is shown in the figure. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0036] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0037] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0038] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. 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.

[0039] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "above" the second feature

[0040] The "below" can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0041] Referring to Figs. 1 to 3 The utility model provides a kind of flow limiting pressure increasing plenum structure of pump suction type portable gas detector, comprising: upper shell 4, air pipe support 7, air pump cover 11, waterproof filter assembly 5, support sealing assembly 6, pressure limiting sleeve 13, sealing element 14, air pressure sensor 12, and the lower shell 15 matched with upper shell 4;

[0042] One end of the air pipe support 7 is in communication with the upper shell 4, and the other end is in communication with the air pump cover 11. The air pipe support 7 is used to realize the gas connection between the air pump cover 11 and the upper shell 4. The waterproof filter assembly 5 is arranged in the air pipe support. The waterproof filter assembly is a waterproof filter membrane, which is used for waterproofing and dustproofing the air inlet and air outlet of the air pipe support 7.

[0043] The support sealing assembly 6 is arranged between the air pipe support 7 and the upper shell 4. The support sealing assembly 6 is a support sealing ring, which is used to ensure the airtight contact between the air pipe support 7 and the upper shell 4, and improve the sealing performance.

[0044] The air pump cover 11 is arranged in the lower shell 15. The air pump cover 11 is provided with a buffer cavity. The pressure limiting sleeve 13 is arranged in the buffer cavity. The pressure limiting sleeve 13 is provided with a flow limiting hole. The flow limiting hole is arranged in the middle of the pressure limiting sleeve 13. The diameter of the flow limiting hole is 0.7 mm. The flow limiting hole is used to increase the pressure of the buffer cavity. The pressure limiting sleeve 13 is made of copper alloy.

[0045] The sealing element 14 is arranged at the bottom of the air pump cover 11 and abuts against the lower shell 15. The sealing element is a sealing cover, which is used to seal the buffer cavity of the air pump cover 11 and improve the sealing performance. The lower shell 15 is fixed and supported at the bottom, and reversely pre-presses the air pump cover 11 to prevent the influence of air pump vibration, and reversely presses the sealing element 14 to prevent it from being ejected after pressure increasing. The buffer cavity is provided with a hole 120 on the side surface, which is used to install the air pressure sensor 12. The air pressure sensor 12 is a sensor used to receive, analyze and process the pressure of gas.

[0046] It can be known that the pressure limiting sleeve 13 increases the pressure of the buffer cavity through the flow limiting hole, detects the pressure size through the air pressure sensor 12, transmits the signal to the PCBA board 10, controls the working current of the air pump 16 through the data analysis of the PCBA board 10, so as to achieve the purpose of controlling the flow rate of gas. The air pump cover 11 has a separate buffer cavity, which is used to buffer and stabilize the flow fluctuation when the air pump works, improve the stability of air flow, and thus improve the accuracy of the measured gas.

[0047] Further, the flow-restricted booster chamber structure of the pump suction type portable gas detector further comprises a calibration cover assembly, a sensor assembly, and a gas pump 16 arranged on the gas pump cover 11. The calibration cover assembly is detachably connected with the upper shell. This design allows users to easily detach the calibration cover assembly from the upper shell 4 as needed for cleaning, maintenance, or replacement, and forms a pump suction gas path with the surface of the upper shell 4. A plurality of air holes are formed in the upper shell 4 to provide a channel for gas flow. The design of these air holes allows gas to flow smoothly through the gas path system, thereby improving the efficiency and accuracy of gas detection. The air pipe support 7 is in communication with the air holes of the upper shell 4 at one end and with the gas pump cover 11 at the other end. It serves as part of the gas path and ensures the effective flow of gas between the gas pump cover 11 and the upper shell 4. The sensor assembly is placed directly below the air holes. The gas pump cover 11 and the gas pump 16 are arranged below the sensor assembly. The calibration cover assembly includes a filter assembly 3, a rotating assembly 19, and a calibration cover 1. The filter assembly 3 is arranged at one end of the calibration cover 1. The rotating assembly is detachably connected with the upper shell 4 after passing through the calibration cover 1, facilitating easy disassembly. The main function of the filter assembly 3 is to filter the gas entering the calibration cover 1, 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.

[0048] Further, the sensor assembly includes a sensor PCBA board 10 and a plurality of electrochemical sensors 9 arranged on the sensor PCBA board 10. The sensor PCBA board 10 is electrically connected to the corresponding ends of the plurality of electrochemical sensors 9 and the air pressure sensor 12. The PCBA board 10 is used for data analysis of the electrochemical sensors 9 and the air pressure sensor 12. The electrochemical sensors are used as conversion devices to convert the volume fraction of a certain gas into corresponding electrical signals. The plurality of electrochemical sensors 9 can simultaneously detect multiple different gases, improving the versatility and flexibility of the gas detector, allowing it to adapt to various detection needs and environmental conditions.

[0049] Further, each electrochemical sensor 9 is also provided with a sensor sealing rubber pad 8 that abuts the upper shell 4 to ensure airtight contact between the upper shell 4 and each electrochemical sensor 9. This design prevents gas leakage and ensures the airtightness of the gas path, thereby ensuring that the gas sample will not be disturbed by the external environment before entering the electrochemical sensor 9. The elastic properties of the sensor sealing rubber pad 8 allow it to adapt to minor irregularities between the electrochemical sensor and the upper shell, providing uniform sealing pressure and ensuring long-term stable sealing effect. The sensor sealing rubber pad 8 not only provides sealing, but also protects the electrochemical sensor 9 from physical impact and vibration, especially when the gas detector is used in harsh environments.

[0050] Further, the calibration cover 1 is provided with an air inlet pipe 2 and an air outlet pipe at one end, and a rotating assembly mounting position is arranged in the middle of the calibration cover 1; the filter assembly 3 is communicated with the air inlet pipe 2 at one end; and the rotating assembly 19 is arranged in the middle of the calibration cover 1. The filter assembly 3 comprises a water hydrazine filter, and one end of the water hydrazine filter is communicated with the air inlet pipe 2. This design ensures that the gas entering the calibration cover 1 is first filtered by the water hydrazine filter to remove impurities such as moisture and dust that may affect the detection result. The rotating assembly 19 comprises a knob arranged in the middle of the calibration cover 1, which is convenient for user operation. The knob is screwed with the upper shell 4 at one end, and the knob is used for quick disassembly and assembly, thereby improving the use convenience and working efficiency of the equipment.

[0051] The working principle of the utility model is as follows:

[0052] The gas is collected from the water hydrazine filter, enters the calibration cover 1 through the air inlet pipe 2, enters the air pipe support 7 through the waterproof filter assembly 5, and then reaches the air pump cover 11. The air pump cover 11 is communicated with the air pump 16, and the air pump cover 11 is used for fixing the air pump 16.

[0053] The gas is discharged from the air pump 16, passes through the internal gas path structure of the air pump cover 11, reaches the buffer cavity, and the outlet of the buffer cavity is limited by the flow limiting hole of the pressure limiting sleeve 13. A certain gas pressure is formed in the buffer cavity, and two small holes are arranged on the side surface of the buffer cavity to connect and fix the gas pressure sensor 12. The gas pressure sensor 12 detects the pressure and transmits a signal to the PCBA board 10. The PCBA board 10 analyzes the data to control the working current of the air pump 16, so as to control the gas flow rate.

[0054] After the gas passes through the pressure limiting sleeve 13, the gas pressure is restored to normal due to the increase of the gas path diameter, and reaches the pumping gas path formed by the upper shell surface 4 and the calibration cover 1 through the air pipe support 7. The gas detection work is completed through the pumping gas path and the electrochemical sensor 9.

[0055] The above only describes the preferred embodiments of the utility model, and does not limit the patent range of the utility model. Any equivalent structural transformation or direct / indirect application in other related technical fields based on the utility model concept, the contents of the utility model specification and the drawings are included in the patent protection range of the utility model.

Claims

1. A flow-limited plenum structure for a pump-action portable gas detector, the structure comprising: include: Upper shell, tracheal support, air pump cover, waterproof filter assembly, support sealing assembly, pressure limiting sleeve, seal, air pressure sensor, and lower shell adapted to the upper shell; One end of the tracheal support is connected to the upper shell, and the other end is connected to the air pump cover; the waterproof filter assembly is installed inside the tracheal support. The support sealing assembly is disposed between the tracheal support and the upper shell to ensure a tight contact between the tracheal support and the upper shell. The air pump cover is installed inside the lower shell, and the air pump cover is configured as a buffer cavity. The pressure limiting sleeve is placed inside the buffer cavity, and the pressure limiting sleeve has flow limiting holes to increase the pressure of the buffer cavity. The sealing element is located at the bottom of the air pump cover and abuts against the lower shell, and is used to seal the buffer cavity of the air pump cover; The buffer cavity has holes on its side for installing a pressure sensor.

2. The flow-restricted plenum chamber structure of a pump- suction portable gas detector according to claim 1, wherein The flow-limiting and pressurizing gas chamber structure of the pump-suction portable gas detector also includes a calibration cover assembly, a sensor assembly, and an air pump mounted on the air pump cover. The calibration cover assembly is detachably connected to the upper shell and forms a pump suction path with the surface of the upper shell; The upper shell has multiple air holes; one end of the air tube support is connected to the air hole of the upper shell, and the other end is connected to the air pump cover; the sensor assembly is placed directly below the air hole; the air pump cover and air pump are located below the sensor assembly.

3. The flow-restricted plenum chamber structure of a pump- suction portable gas detector according to claim 2, wherein The calibration cover assembly includes a filter assembly, a rotating assembly, and a calibration cover; The filter assembly is located at one end of the calibration cover, and one end of the rotating assembly passes through the calibration cover and is detachably connected to the upper shell.

4. The flow-restricted plenum chamber structure of a pump- suction portable gas detector according to claim 2, wherein The sensor assembly includes a sensor PCBA board and multiple electrochemical sensors mounted on the sensor PCBA board; the corresponding ends of the sensor PCBA board are electrically connected to the corresponding ends of the multiple electrochemical sensors and the pressure sensor, respectively.

5. The flow-restricted plenum chamber structure of a pump- suction portable gas detector according to claim 4, wherein Each of the electrochemical sensors is also provided with a sensor sealing rubber gasket, which abuts against the upper shell to ensure that the upper shell and each electrochemical sensor are in sealed contact.

6. The flow-restricted plenum chamber structure of a pump- suction portable gas detector according to claim 3, wherein The calibration cover has an air inlet pipe and an air outlet pipe at one end, and a rotating component mounting position in the middle of the calibration cover; one end of the filter component is connected to the air inlet pipe; the rotating component is located in the middle of the calibration cover.

7. The flow-restricted plenum chamber structure of a pump- suction portable gas detector according to claim 6, wherein The filtration assembly includes a water-hydrazine filter, one end of which is connected to the air inlet pipe.

8. The flow-restricted plenum chamber structure of the pump- suction portable gas detector according to claim 6, wherein The rotating assembly includes a knob located in the center of the calibration cover, with one end of the knob connected to the upper shell via a thread.

9. The flow-restricted plenum chamber structure of a pump- suction portable gas detector according to claim 1, wherein The waterproof filter assembly is configured as a waterproof filter membrane.

10. The flow-restricted plenum chamber structure of a pump- based portable gas detection instrument according to claim 1, wherein The bracket sealing assembly is configured as a bracket sealing ring, and the sealing element is configured as a sealing cap.

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