Gas sensor response and recovery time detection device

Abstract

The utility model discloses a gas sensor response and recovery time detection device, which relates to the technical field of gas sensors, and comprises a first cavity, a second cavity, a gas sensor and an isolation device, the first cavity is provided with a gas inlet and a gas outlet, and the second cavity is provided with a gas outlet. The first cavity is used for containing gas to be detected, the second cavity is communicated with the first cavity to form a first opening located between the first cavity and the second cavity, the gas sensor is arranged in the second cavity and used for detecting the gas to be detected, and the isolation device comprises a movable part movably arranged in the first cavity, and a closing position arranged at the first opening and a communicating position far away from the first opening are arranged on the moving stroke of the first opening. According to the technical scheme of the utility model, the second cavity and the movable part are arranged, so that the air sensor can realize seamless switching between the air background and the environment background to be measured, and the measurement result is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of gas sensors, and particularly relates to a device for detecting the response and recovery time of a gas sensor. Background Art

[0002] Gas sensors are widely used in environmental monitoring systems and ventilation purification systems for monitoring air quality. To ensure the reliability of the operation of gas sensors, it is necessary to test the operating characteristic parameters of gas sensors.

[0003] Existing testing devices usually directly place gas sensors in a gas chamber and switch test gases and fresh air through a solenoid valve. However, during the gas switching process, due to the need for gas diffusion, the gas concentration establishment time is long, and the response time and recovery time cannot be continuously tested, resulting in inaccurate final test time. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a device for detecting the response and recovery time of a gas sensor, aiming to solve the problem that the existing detection device cannot continuously complete the tests of the response time and recovery time.

[0005] To achieve the above purpose, the utility model proposes a device for detecting the response and recovery time of a gas sensor, comprising:

[0006] A first chamber, having an air inlet and an air outlet, and the first chamber is used for accommodating the gas to be measured;

[0007] A second chamber, which is communicated with the first chamber to form a first opening between the first chamber and the second chamber;

[0008] A gas sensor, which is arranged in the second chamber for detecting the gas to be measured; and,

[0009] An isolation device, comprising a movable part movably arranged in the first chamber, and having a closed position placed at the first opening and a communicating position away from the first opening in its moving stroke.

[0010] In one embodiment, the end of the second chamber extends into the first chamber, and an opening is formed at its end to form the first opening.

[0011] In one embodiment, the movable part comprises a baffle plate, and the baffle plate is movably arranged in the first chamber to block the communication between the first chamber and the second chamber in the closed position, and in the communicating position, the first chamber and the second chamber are communicated through the first opening;

[0012] The isolation device further includes a movable rod, a part of which is movably disposed through the first cavity to form a driving end located outside the first cavity and a connecting end connected to the baffle, for driving the baffle to move.

[0013] In an embodiment, the first opening is arranged facing the baffle, so that when the baffle is in the closed position, the movable rod drives the baffle to abut against the edge of the first opening.

[0014] In an embodiment, the gas sensor is arranged on one side of the baffle facing the second cavity.

[0015] In an embodiment, a second opening is formed at one end of the second cavity outside the first cavity, and a cover plate is covered at the second opening.

[0016] In an embodiment, a through hole is provided on the cover plate for the sensor wire harness to extend into the second cavity and be connected to the gas sensor.

[0017] In an embodiment, the gas sensor response and recovery time detection device further includes a temperature sensor arranged in the first cavity for detecting the temperature of the gas in the first cavity; and / or,

[0018] a humidity sensor arranged in the first cavity for detecting the humidity of the gas in the first cavity; and / or,

[0019] a pressure sensor arranged in the first cavity for detecting the pressure of the gas in the first cavity.

[0020] In an embodiment, the gas sensor response and recovery time detection device further includes a gas distribution device connected to the air inlet for introducing gas into the first cavity.

[0021] In an embodiment, the gas sensor response and recovery time detection device further includes a recovery device connected to the exhaust port for receiving the gas in the first cavity.

[0022] The technical solution of the utility model is to set a second cavity connected to the first cavity, and set a gas sensor in the second cavity, so that the gas sensor can detect the gas in the first cavity. Furthermore, by setting an isolation device, the isolation device includes a movable part, and the movable part makes the first cavity and the second cavity connected or closed during the activity. By switching the gas environment in the first cavity when the first cavity and the second cavity are disconnected, it is ensured that the gas sensor is not disturbed during the environment switching process. Subsequently, by connecting the first cavity with the second cavity, the gas sensor can achieve seamless switching between the air background and the environment background to be measured, and the measurement result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 This is a structural schematic diagram of an embodiment of a gas sensor response and recovery time detection device provided by the utility model.

[0025] Description of Figure Numbers:

[0026] 1000. Gas sensor response and recovery time detection device; 1. First cavity; 11. Air inlet; 12. Exhaust port; 2. Second cavity; 21. First opening; 22. Second opening; 23. Cover plate; 231. Through hole; 3. Gas sensor; 31. Sensor wiring harness; 4. Isolation device; 41. Movable part; 411. Baffle; 42. Movable rod; 421. Driving end; 422. Connecting end; 5. Gas distribution device; 6. Recovery device.

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] Gas sensors are widely used in environmental monitoring systems and ventilation purification systems for monitoring air quality. To ensure the reliability of the operation of gas sensors, it is necessary to test the operating characteristic parameters of gas sensors.

[0032] Existing test devices usually directly set gas sensors in gas chambers and switch test gases and fresh air through solenoid valves. However, during the gas switching process, due to the need for gas diffusion, the gas concentration establishment time is long, and the response time and recovery time tests cannot be continuously completed, resulting in inaccurate final test times. Moreover, the existing test devices have relatively complex structures and high manufacturing costs. For some simple-structured test devices, the accuracy of test results cannot be guaranteed, and the influence of changes in temperature, humidity, and air pressure on the gas response time cannot be measured.

[0033] The main purpose of the present utility model is to propose a gas sensor response and recovery time detection device, aiming to solve the problem that the existing detection devices cannot continuously complete the response time and recovery time tests.

[0034] Please refer to Figure 1The utility model proposes a gas sensor response and recovery time detection device 1000 including a first cavity 1, a second cavity 2, a gas sensor 3 and an isolation device 4. The first cavity 1 has an air inlet 11 and an exhaust port 12 for accommodating the gas to be measured. The second cavity 2 is connected to the first cavity 1 to form a first opening 21 between the first cavity 1 and the second cavity 2. The gas sensor 3 is arranged in the second cavity 2 for detecting the gas to be measured. The isolation device 4 includes a movable part 41 movably arranged in the first cavity 1, and has a closed position placed at the first opening 21 and a connected position away from the first opening 21 in its movable stroke.

[0035] The technical solution of the utility model is to set a second cavity 2 connected to the first cavity 1, and set the gas sensor 3 in the second cavity 2, so that the gas sensor 3 can detect the gas in the first cavity 1. Further, by setting an isolation device 4, the isolation device 4 includes a movable part 41, and the movable part 41 makes the first cavity 1 and the second cavity 2 connected or closed during the activity process, and by switching the gas environment in the first cavity 1 when the first cavity 1 and the second cavity 2 are disconnected, it is ensured that the gas sensor 3 is not disturbed during the environment switching process, and subsequently by connecting the first cavity 1 with the second cavity 2, the gas sensor 3 can achieve seamless switching between the air background and the environment background to be measured, and the measurement result is more accurate.

[0036] It should be noted that the volume ratio of the second cavity 2 to the first cavity 1 is less than 1:40. By controlling the volume ratio of the second cavity 2 to the first cavity 1, the difference between the gas environment of the two cavities after mixing due to the inconsistency of the two cavity environments and the gas environment of the original cavity is less than 2.5%. The greater the difference between the volume of the first cavity 1 and the volume of the second cavity 2, the smaller the influence of the gas flow, temperature and humidity differences in the cavity on the measurement difference, thereby being able to reduce the measurement error in a targeted manner.

[0037] It is worth mentioning that, in order to ensure that the gas sensor 3 can achieve seamless switching between the air background and the background of the environment to be measured, in another embodiment of the present utility model, a third opening is provided on the first cavity 1, the second cavity 2 is communicated with the first cavity 1 through the third opening, and a part of the second cavity 2 can movably extend into the first cavity 1. A holding portion is fixedly provided in the first cavity 1. The second cavity 2 has a closed position where the holding portion abuts against the edge of the first opening 21 and a communication position away from the holding portion during its moving stroke. With such a design, since a part of the second cavity 2 is located outside the first cavity 1, it is convenient to externally arrange a driving structure or manually drive the second cavity 2 to move, avoiding arranging a driving structure inside the first cavity 1 or additionally arranging holes, which may cause the sealing performance of the first cavity 1 to decline.

[0038] To ensure the tightness of the structure between the second cavity 2 and the first cavity 1, in an embodiment of the present utility model, the end of the second cavity 2 extends into the first cavity 1, and an opening is formed at its end to form the first opening 21. With such a design, the second cavity 2 and the first cavity 1 are in a nested structure, the overall structure is more stable, and the airtightness can be guaranteed, improving the safety of the device.

[0039] It is worth mentioning that the first opening 21 can be set at any position of the part where the end of the second cavity 2 extends into the first cavity 1. For example, in a preferred embodiment, the second cavity 2 is located above the first cavity 1, and the first opening 21 is provided at the bottom end of the second cavity 2, so as to facilitate the arrangement of other mechanisms such as the movable portion 41. In another embodiment, the second cavity 2 is located above the first cavity 1, and the first opening 21 is provided at the side end of the second cavity 2, so as to prevent the gas sensor 3 from falling into the first cavity 1, and there is no need to additionally provide a fixing structure for the gas sensor 3.

[0040] Specifically, in a preferred embodiment of the present utility model, the movable part 41 is provided as a baffle 411. The baffle 411 is movably arranged in the first cavity 1 to block the communication between the first cavity 1 and the second cavity 2 in the closed position. In the communicating position, the first cavity 1 and the second cavity 2 communicate through the first opening 21. The isolation device 4 further includes a movable rod 42. The movable rod 42 is partially movably inserted into the first cavity 1 to form a driving end 421 located outside the first cavity 1 and a connecting end 422 connected to the baffle 411, so as to drive the baffle 411 to move. With such a setting, the movable rod 42 drives the baffle 411 to move, and the structure is simple. By arranging the driving end 421 outside the first cavity 1, it is convenient for subsequent manual operation or arranging a driving device to drive. It is worth mentioning that the movable rod 42 moves along its extending direction, thereby avoiding opening too large holes on the outer wall of the first cavity 1, thus improving the sealing performance of the first cavity 1. During the movement of the movable rod 42, since the first cavity 1 and the second cavity 2 are airtight, a certain air pressure needs to be overcome. The pressure to be overcome can be reduced by appropriately reducing the cross-section of the movable rod 42.

[0041] It should be noted that the present utility model does not limit the specific movement form of the baffle 411. In an embodiment of the present utility model, the baffle 411 moves on the same plane as the first opening 21, so that when in the closed position, the baffle 411 covers the first opening 21. With such a design, the structure is simpler, and it is convenient to synchronously arrange a driving device to drive the baffle 411 to move.

[0042] In a preferred embodiment of the present utility model, please refer to Figure 1 , the first opening 21 is arranged facing the baffle 411, so that when the baffle 411 is in the closed position, the movable rod 42 drives the baffle 411 to abut against the edge of the first opening 21. With such a setting, when the baffle 411 is in the closed position, the movable rod 42 can ensure that the baffle 411 closely adheres to the edge of the first opening 21, so as to improve the sealing performance of the second cavity 2 and avoid gas leakage into the second cavity 2 during the process of changing the gas environment, which affects the test results.

[0043] Further, the gas sensor 3 is disposed on the side of the baffle 411 facing the second cavity 2. With such a design, during the movement of the baffle 411, the gas sensor 3 is driven to move between the second cavity 2 and the first cavity 1, so that the gas sensor 3 can fully contact the gas in the first cavity 1, further improving the detection accuracy. And when the baffle 411 moves to the closed position, the gas sensor 3 is driven by the baffle 411 to move into the second cavity 2, preventing the gas sensor 3 from coming into contact with the gas whose calibration concentration has not been established prematurely.

[0044] It should be noted that the connection form between the gas sensor 3 and the baffle 411 in this solution is not limited. It can be a fixed connection, or when the moving form of the baffle 411 is up and down movement, the gas sensor 3 is directly placed above the baffle 411 for easy picking and placing. The second embodiment is selected as the preferred embodiment in this solution.

[0045] Furthermore, a second opening 22 is provided at one end of the second cavity 2 located outside the first cavity 1, and a cover plate 23 is covered at the second opening 22. With such a design, it is convenient to pick and place the gas sensor 3 so that when the gas sensor 3 is damaged, it can be replaced in time. At the same time, a cover plate 23 is covered to ensure the sealing performance of the second cavity 2. It can be understood that to ensure the sealing performance at the cover plate 23, a sealing device such as a sealing ring can be added at the cover plate 23 or a covering structure can be added between the cover plate 23 and the cavity wall. The present utility model does not make specific limitations here.

[0046] Still further, a through hole 231 is provided on the cover plate 23 for the sensor wire harness 31 to extend into the second cavity 2 and be connected to the gas sensor 3. With such a design, the real-time data of the gas sensor 3 can be directly reflected on the external electronic device through the sensor wire harness 31, which is convenient for the detection personnel to record. By providing the through hole 231, it is convenient for the sensor wire harness 31 to be connected to the gas sensor 3. It can be understood that since it is in the measured gas environment for a long time, the outer shell of the sensor wire harness 31 is made of corrosion-resistant material. To ensure the sealing performance at the through hole 231, a sealing device such as a sealing ring can be added at the through hole 231. The present utility model does not make specific limitations here.

[0047] In an embodiment of the present utility model, the gas sensor response and recovery time detection device 1000 further includes a gas distribution device 5, which is connected to the air inlet 11 and is used to introduce gas into the first cavity 1. By providing the gas distribution device 5, it is convenient to introduce the required gas into the first cavity 1. The specific implementation form of the gas distribution device 5 is not limited in this solution. For example, it can be an air pump that can quickly introduce fresh air, or a gas cylinder filled with the gas to be measured. It can be understood that the gas distribution device 5 is provided with an adjustment device capable of adjusting the humidity, temperature, and air pressure of the gas, which is convenient for subsequent performance testing of the gas sensor 3 under different environments.

[0048] In an embodiment of the present utility model, the gas sensor response and recovery time detection device 1000 further includes a recovery device 6, which is connected to the exhaust port 12 and is used to receive the gas in the first cavity 1. By providing the recovery device 6, it is possible to avoid environmental pollution and resource waste caused by the direct discharge of gas into the air through the exhaust hole. For some gases that can be recycled, they can be collected by the recovery device 6 and then introduced into the air inlet 11 again; for some harmful gases, they can be introduced into the treatment liquid by the recovery device 6 for absorption or converted into gases meeting the emission standards and then discharged into the air.

[0049] In an embodiment, the gas sensor response and recovery time detection device 1000 is further provided with a temperature sensor, a humidity sensor, and a pressure sensor. The temperature sensor is disposed in the first cavity 1 to detect the temperature of the gas in the first cavity 1. The humidity sensor is disposed in the first cavity 1 to detect the humidity of the gas in the first cavity 1. The pressure sensor is disposed in the first cavity 1 to detect the air pressure of the gas in the first cavity 1. By providing the temperature sensor, the humidity sensor, and the pressure sensor, this device can measure the response time curve and the recovery time curve of the gas sensor 3 in different environmental gases.

[0050] It is worth mentioning that the temperature sensor, the humidity sensor, and the pressure sensor can be set one by one or synchronously, and the present utility model does not limit this here.

[0051] The application process of the gas sensor response and recovery time detection device 1000 in different humidity environments will be elaborated in detail below. The movable rod 42 places the gas sensor 3 in the middle of the first cavity 1. The gas recovery device 6 pumps the gas in the first cavity 1 into the atmosphere. Harmless, non-flammable, and non-explosive gases are directly discharged into the atmosphere without treatment. Close the exhaust port 12, open the intake port 11, the gas distribution device 5 injects high-purity air into the first cavity 1 and then closes the intake port 11. Wait for 5 to 10 seconds until the gas to be detected is evenly diffused in the first cavity 1. Start the movable rod 42, and the movable rod 42 drives the baffle 411 and the gas sensor 3 to move to the center of the first cavity 1. At this time, start to record the time required for the signal of the gas sensor 3 to reach 90% of the steady-state value, which is the gas sensor response time. After the recording is completed, start the movable rod 42 to drive the baffle 411 and the gas sensor 3 to move to the second cavity 2. The movable rod 42 can be extended and retracted in a pneumatic, electric, hydraulic or manual manner to seal the second cavity 2. Then, when the gas distribution device 5 injects water vapor to make the humidity in the first cavity 1 reach 50%, drive the movable rod 42 to place the gas sensor 3 in the first cavity 1 and record the gas sensor response value. After the above tests are completed, one round of tests is completed. However, to reduce errors, ten rounds of repetitive tests need to be completed, and the gas sensor response values are analyzed and processed to obtain the influence value of 50% humidity on the gas sensor response. Then, through multiple groups of experiments, data collection of relative humidity such as 5%, 20%, 50%, 70% and 95% is obtained. Finally, the gas sensor response time curve under different humidity conditions can be obtained.

[0052] It can be understood that the application process of the gas sensor response and recovery time detection device 1000 in different temperature or pressure environments and the process of drawing the recovery time curve are similar in concept to the above embodiments, and will not be elaborated here.

[0053] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A gas sensor response and recovery time detection device, characterized in that: include: A first cavity having an air inlet and an air outlet, wherein the first cavity is used to contain the gas to be measured; A second cavity is connected to the first cavity to form a first opening between the first cavity and the second cavity; A gas sensor, disposed in the second cavity, for detecting the gas to be measured; as well as, The isolation device comprises a movable part movably arranged in the first cavity, and has a closed position placed at the first opening and a connecting position away from the first opening in its movable stroke.

2. The gas sensor response and recovery time detection device according to claim 1, characterized in that: The end of the second cavity extends into the first cavity, and a hole is opened at the end to form the first opening.

3. The gas sensor response and recovery time detection device according to claim 2, characterized in that: The movable portion includes a baffle, which is movably disposed in the first cavity to block the communication between the first cavity and the second cavity when in a closed position, and in a communicating position, the first cavity and the second cavity are communicated through the first opening; The isolation device further comprises a movable rod, wherein the movable rod is partially movably arranged in the first cavity to form a driving end located outside the first cavity and a connecting end connected to the baffle, so as to drive the baffle to move.

4. The gas sensor response and recovery time detection device according to claim 3, characterized in that: The first opening is arranged toward the baffle, so that when the baffle is located at the closed position, the movable rod drives the baffle to abut against the edge of the first opening.

5. The gas sensor response and recovery time detection device according to claim 4, characterized in that: The gas sensor is arranged on a side of the baffle facing the second cavity.

6. The gas sensor response and recovery time detection device according to claim 5, characterized in that: A second opening is formed at one end of the second cavity outside the first cavity, and a cover plate is covered at the second opening.

7. The gas sensor response and recovery time detection device according to claim 6, characterized in that: The cover plate is provided with a through hole for allowing the sensor harness to extend into the second cavity and be connected to the gas sensor.

8. The gas sensor response and recovery time detection device according to claim 1, characterized in that: The gas sensor response and recovery time detection device further includes a temperature sensor, which is disposed in the first cavity and is used to detect the temperature of the gas in the first cavity; and / or, a humidity sensor, the humidity sensor being disposed in the first cavity and configured to detect the humidity of the gas in the first cavity; and / or, An air pressure sensor is disposed in the first cavity to detect the air pressure of the gas in the first cavity.

9. The gas sensor response and recovery time detection device according to claim 1, characterized in that: The gas sensor response and recovery time detection device further includes a gas distribution device, which is connected to the gas inlet and is used to introduce gas into the first cavity.

10. The gas sensor response and recovery time detection device according to claim 1, characterized in that: The gas sensor response and recovery time detection device further includes a recovery device, which is connected to the exhaust port and is used to receive the gas in the first cavity.

Images