Sealing structure for sensor and application of sealing structure in gas explosion test of closed pipeline

Abstract

The invention discloses a sealing structure for a sensor and an application of the sealing structure in a gas explosion test of a closed pipeline, and the sealing structure comprises a sensor sealing base, and the sensor is arranged in a cavity of the sensor sealing base; one end of the sensor sealing base is a test information transmission part; the other end is a sensor fixing part; the test information transmission part is hermetically connected with the sensor fixing part and is provided with a sealing element; the sealing element is selected according to a gas explosion test environment; a clamping structure is arranged in a cavity of the sensor fixing part, the sensor can be fixed in gas explosion airflow, and the clamping structure can adjust the distance between the sensor and a test position by adjusting the distance between the test information transmission part and the sensor fixing part. The sealing structure is used for solving the problem that gas explosion test data is influenced by a test environment and the precision is reduced, can effectively solve the problem that a sensor is easy to damage in a high-temperature and high-pressure closed test environment, and realizes multiple repeated tests of the sensor.

Description

Technical Field

[0001] The present invention relates to the field of sensor device applications, and particularly to a sealing structure for a sensor and its application in the gas explosion test of a closed pipeline. Background Art

[0002] A sensor is a detection device that can sense the information to be measured and transform the sensed information into an electrical signal or other required form of information output according to a certain rule to meet the requirements of information transmission, processing, storage, display, recording, and control, etc.

[0003] After retrieval, a sensor with a sealing function, such as the one with the authorization announcement number: CN217058853U, although having the advantage of preventing the leakage of liquid or gas from the threaded part of the sensor, has a narrow scope of application and cannot be used in an environment with a relatively high temperature. Moreover, this device does not have the function of fixing the sensor. If tested in a closed environment with an explosion shock wave, the sensor may be torn off under the influence of the explosion shock wave, resulting in waste of the sensor and increased experimental costs. Summary of the Invention

[0004] To solve the above problems, the present invention provides a sealing structure for a sensor and its application in the gas explosion test of a closed pipeline, which is used to solve the problem that the gas explosion test data is affected by the test environment and the accuracy is reduced; at the same time, it solves the problem that it is difficult to control the length of the sensor element during the installation of the sensor, making the installation of the sensor more convenient and realizing the reuse of the sensor. In addition, it also solves the problem that the sensor is easily damaged by the explosion shock wave during the test.

[0005] The object of the present invention is a sealing structure for a sensor and its application in the gas explosion test of a closed pipeline.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows.

[0007] The present invention proposes an idea to overcome the accuracy problem existing in gas explosion in the prior art. In the gas explosion experiment, due to the test environment problem, especially when conducting a deflagration experiment in a sealed pipeline, when the combustible gas in the pipeline is ignited and consumed, a negative pressure environment is formed in the pipeline, which causes the sensor to extend into the pipeline. And because there is also a small amount of combustible gas in the sealing structure, when this small amount of combustible gas is ignited, the formed flame will also force the sensor to extend outwards, making the sensor easily torn off. At the same time, the movement of the sensor also causes a change in the measurement accuracy. Therefore, on the one hand, the present invention provides a stable fixing structure to solve the problem of the sensor extending outwards, and at the same time, by using the structural design of the test part and the information transmission part, the test position is adjusted to further improve the test accuracy.

[0008] On the one hand, the present invention provides a sealing structure for a sensor, which sealing structure comprises:

[0009] A sensor sealing base, with the sensor placed in the chamber of the sensor sealing base;

[0010] One end of the sensor sealing base is a test information transmission part; the other end is a sensor fixing part;

[0011] The test information transmission part and the sensor fixing part are sealingly connected and are provided with a sealing member;

[0012] The sealing member is selected according to the gas explosion test environment;

[0013] A clamping structure is provided in the chamber of the sensor fixing part, which can fix the sensor in the gas explosion airflow. By adjusting the distance between the test information transmission part and the sensor fixing part, the distance between the sensor and the test position can be adjusted.

[0014] On the other hand, the present invention provides an application of the sensor sealing structure in the gas explosion test of a closed pipeline, by arranging the sealing structure on the sensor to improve the accuracy of the gas explosion test.

[0015] Select the sealing member according to the gas explosion temperature and set it between the test information transmission part and the sensor fixing part; adjust the distance between the test information transmission part and the sensor fixing part so that the working end of the sensor exposes the sensor sealing structure.

[0016] The present invention has the following remarkable advantages compared with the prior art:

[0017] 1. The sealing structure of the present invention can be used when the sensor needs to be installed in a closed test environment, solving the sealing problem during the installation of the sensor;

[0018] 2. The test information transmission part and the sensor fixing part of the sealing structure of the present invention are connected by straight threads, enabling the test information transmission part to be fully screwed into the sensor fixing part, facilitating the control of the distance that the sensor extends out of the sensor fixing part.

[0019] 3. The present invention can effectively solve the sealing problem of the sensor and the problem that the sensor is easily damaged in a high-temperature and high-pressure closed test environment, realizing multiple repeated tests of the sensor.

[0020] 4. The sealing structure of the present invention can use an O-ring sealing rubber or a copper gasket according to different usage scenarios to achieve the sealing effect; the sensor can be fixed by a polytetrafluoroethylene fixture, avoiding damage to the sensor during the test and extending the service life of the sensor.

[0021] 5. The present invention can solve the problem that the gas explosion test data is affected by the test environment and the accuracy is reduced. Brief Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the sealing structure of the sensor of the present invention.

[0023] Figure 2 It is a three-dimensional view of the sealing structure of the sensor of the present invention.

[0024] Figure 3 It is a three-dimensional perspective view of the sealing structure of the sensor of the present invention.

[0025] Figure 4 It is a schematic diagram of the polytetrafluoroethylene fixture of the present invention.

[0026] Figure 5 It is a voltage signal diagram measured by a thermocouple during the detonation experiment of the present invention.

[0027] Figure 6 It is a pressure diagram at different positions in the sealed pipeline during detonation.

[0028] Figure 7 It is a pressure diagram at different positions in the sealed pipeline during deflagration.

[0029] Description of the reference numerals in the drawings:

[0030] 1 - Threaded copper column electrode; 2 - Nut; 3 - Head of the sealing structure; 4 - O-ring seal or copper gasket; 5 - Bottom of the sealing structure; 6 - Recessed groove at the bottom of the sealing structure. Detailed Embodiments

[0031] The following illustrates the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0032] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components during actual implementation. The type, quantity, and ratio of each component during actual implementation can be arbitrarily changed, and the layout type of the components may also be more complex.

[0033] The present invention provides a sealing structure for a sensor, and the sealing structure includes:

[0034] A sensor sealing base, and the sensor is placed in the chamber of the sensor sealing base;

[0035] One end of the sensor sealing base is a test information transmission part; the other end is a sensor fixing part;

[0036] The test information transmission part and the sensor fixing part are hermetically connected and are provided with a sealing member;

[0037] The sealing member is selected according to the gas explosion test environment;

[0038] A clamping structure is provided in the chamber of the sensor fixing part, which can fix the sensor in the gas explosion airflow. By adjusting the distance between the test information transmission part and the sensor fixing part, the distance between the sensor and the test position can be adjusted.

[0039] The present invention provides a specific implementation manner. The test information transmission part and the sensor fixing part are fixedly connected by straight threads. The test information transmission part can be completely screwed into the sensor fixing part to control the distance that the sensor extends out of the sensor sealing base.

[0040] The present invention provides a specific implementation manner. A threaded copper column electrode is provided in the test information transmission part. The threaded copper column electrode penetrates through the test information transmission part, and two threaded copper column electrodes are provided at symmetric positions;

[0041] The head of the threaded copper column electrode is equipped with a nut and a gasket for connecting a wire to transmit the electrical signal generated by the sensor into the data collector; the bottom of the threaded copper column electrode is also equipped with a nut and a gasket for connecting the wire of the sensor.

[0042] By adopting the threaded copper column electrode to connect with the sensor, the present invention can transmit the electrical signal generated by the sensor to the data collector when the sensor is placed in a sealed environment.

[0043] The present invention provides a specific implementation manner. The sealing member is an O-ring seal or a copper gasket.

[0044] It should be noted that: when the working environment temperature is lower than 200°C, an O-ring seal is used for sealing;

[0045] When the working environment temperature is higher than 200°C, a copper gasket is used for sealing.

[0046] During the gas explosion test, different sealing members need to be selected according to different measurement environments. When the temperature is too high, the O-ring seal may be charred or even carbonized by the high-temperature flame.

[0047] In this way, the purpose of selecting different sealing materials according to the working environment temperature is to bring the sealing performance of the sensor sealing base into the best state.

[0048] The present invention provides a specific implementation manner. The sensor sealing base is made of 304 stainless steel throughout, has good explosion-proof and high-pressure resistance functions, can be used in relatively extreme working environments, and placing the sensor in the sealing base can effectively protect the sensor from damage.

[0049] The present invention provides a specific implementation manner. A cylindrical channel with a diameter of 5 mm runs through the chamber of the sensor fixing part for placing the sensor.

[0050] The present invention provides a specific implementation manner. An indented groove is provided in the chamber of the sensor fixing part for fixing the clamping structure;

[0051] The present invention provides a specific implementation manner. Threads are provided on the outside of the sensor fixing part, so that the sealing base can be connected to different experimental instruments according to different experimental requirements.

[0052] The present invention provides a specific implementation manner. The clamping structure in the present invention uses a polytetrafluoroethylene fixture.

[0053] The polytetrafluoroethylene fixture is provided with two buckles. The conical bodies of the buckles can pass through the slots on the rectangular plane to fasten and fix the sensor between two rectangular polytetrafluoroethylene fixtures. Strip-shaped protrusions can be provided on the rectangular surface of the fixture to increase friction (not marked in the figure), so that the sensor will not be compressed or elongated due to the influence of other factors such as pressure, realizing the protection of the sensor and the repeated and efficient progress of the experiment.

[0054] Example 1

[0055] Please refer to Figure 1 , Figure 1 which is a schematic diagram of the sealing structure of the sensor in the embodiment of the present invention. The sealing structure of the sensor in the embodiment of the present invention includes:

[0056] The head of the sealing structure, through which two threaded copper column electrodes 1 run; an O-ring seal or a copper gasket 3 is placed at the right end of the straight thread; the bottom 4 of the sealing structure and the indented groove 5 at its lower end.

[0057] In Example 1, the data transmission line is connected to the threaded copper column electrode 1 at the upper end of the head 3 of the sensor sealing structure. Specifically, the wire of the data transmission line is stripped, and the two poles are respectively wound around the threaded copper column electrode and fixed with a nut 2. It should be noted that when connecting, do not make the two wires contact each other to avoid short circuit.

[0058] In Example 1, by Figure 1As shown, an O-ring seal or a copper gasket 3 is placed at the right end of the straight thread. Specifically, if the working ambient temperature is lower than 200 °C, an O-ring seal can be used for sealing; if the working ambient temperature is higher than 200 °C or even higher, the copper gasket can be used instead, because when the temperature is too high, the O-ring seal may be charred or even carbonized by the high-temperature flame, thus losing its sealing function.

[0059] In Embodiment 1, the two poles of the sensor transmission line are connected to the threaded copper column electrode 1 at the lower end of the head 3 of the sensor sealing structure.

[0060] Specifically, strip the wires of the sensor transmission line, wind the two poles around the threaded copper column electrode respectively, and fix the wires with nuts 2. It should be noted that when connecting, do not let the two wires touch each other to avoid short circuit.

[0061] In Embodiment 1, the length of the sensor needs to be controlled to ensure that only the working end of the sensor is exposed 2 - 3 mm below the lower end of the bottom 5 of the sealing structure.

[0062] When it is too long, the sensor is easily broken by the explosion shock wave, resulting in loss of the sensor; when it is too short, the sensor may cause insufficient contact area, resulting in inaccurate experimental data measured or inability to measure experimental data.

[0063] In Embodiment 1, the head 3 of the sealing structure and the bottom 5 of the sealing structure are connected by threads.

[0064] Since the sealing device adopts a straight thread structure, the head 3 of the sealing structure is directly screwed completely into the bottom 5 of the sealing structure, so that the O-ring seal or the copper gasket 3 can be pressed tightly to achieve the sealing effect.

[0065] In Embodiment 1, there is an indented groove 6 at the bottom of the sealing structure 5 of the sensor, which is used to place a polytetrafluoroethylene fixture for fixing the sensor to ensure that the position of the sensor does not change after each test. Specifically, after placing the sensor and the working section is exposed 2 - 3 mm below the lower end of the bottom 5 of the sealing structure, use the buckle on the fixture to clamp and fix the sensor.

[0066] In Embodiment 1, the polytetrafluoroethylene fixture can be fixed in the indented groove at the lower end of the bottom 5 of the sealing structure.

[0067] In Embodiment 1, the lower end of the bottom 5 of the sealing structure has threads, and the sealing base can be connected to different experimental instruments according to different experimental requirements.

[0068] The present invention provides an application of a sensor sealing structure in gas explosion testing. By setting a sealing structure on the sensor, it is used to improve the accuracy of gas explosion testing.

[0069] The present invention provides a specific implementation manner, in which a seal is selected according to the gas explosion temperature and is arranged between the test information transmission part and the sensor fixing part; the distance between the test information transmission part and the sensor fixing part is adjusted so that the working end of the sensor exposes 2 - 3 mm from the sensor sealing structure.

[0070] The present invention provides a specific implementation manner. When using an O - ring sealant, when screwing the head of the sealing base into the bottom of the sealing base, excessive torque does not need to be provided because the O - ring sealant has elasticity and pressing it can achieve the sealing effect.

[0071] The present invention provides a specific implementation manner. When using a copper gasket, due to the weak ductility of the copper gasket, a relatively large torque needs to be provided when screwing the head of the sealing base into the bottom of the sealing base to achieve the sealing effect.

[0072] Example 2

[0073] Select a seal according to the gas explosion temperature and arrange it between the test information transmission part and the sensor fixing part; adjust the distance between the test information transmission part and the sensor fixing part so that the working end of the sensor exposes 2 - 3 mm from the sensor sealing structure, and conduct an explosion experiment in a closed pipeline.

[0074] As Figure 5 It can be seen that when using the sealing structure of the present invention to conduct a detonation experiment on methane gas with an equivalence ratio of 0.8 in a closed pipeline, the voltage signals measured by the thermocouple. In the figure, the two inverted U - shaped curves are the voltage signals of the thermocouple measured by the device of the present invention, and the relatively flat curve below is the voltage signal of the thermocouple measured when the thermocouple is not fixed by the present invention. The temperatures corresponding to the two inverted U - shaped curves obtained by converting the voltage signals are about 1700 °C, and the temperature of the relatively flat curve is about 200 °C. According to the gas detonation characteristics, the temperatures of the two inverted U - shaped curves are more in line with the actual situation, that is, the detonation parameters of the closed pipeline can be measured better. And the coincidence of the two inverted U - shaped curves is better, which can well show the accuracy of the experimental data measured by the device of the present invention under the interference of strong shock waves.

[0075] In addition, as Figure 6 It can be seen that if the sealing structure of the present invention is not adopted, when conducting a detonation experiment in a closed pipeline, the maximum pressure of the detonation of the combustible gas can reach 3.5 MPa, and the pressure generated may press the sensor installed on the sealing structure into the sealing device, resulting in the need to disassemble the sealing structure to reinstall the sensor correctly after each experiment, increasing the time cost of the experiment. At the same time, the excessive pressure may also cause the sensor to vibrate, thus affecting the accuracy of the measured experimental data.

[0076] In addition, as Figure 7It can be seen that without adopting the sealing structure of the present invention, during the deflagration experiment in a closed pipeline, the maximum pressure of the deflagration of the combustible gas can reach 0.65 MPa. Although the pressure is not sufficient to press the sensor into the sealing structure, when the combustible gas in the pipeline is ignited and consumed, a negative pressure environment is formed in the pipeline, which will cause the sensor to extend into the pipeline. And because there is also a small amount of combustible gas in the sealing structure, when this small amount of combustible gas is ignited, the formed flame will also force the sensor to extend out of the sealing structure, making the sensor easily broken and increasing the cost of the experiment.

[0077] The present invention provides a sealing structure for a sensor and its application in the gas explosion test of a closed pipeline. The sensors used in the present invention include but are not limited to temperature sensors, pressure sensors, humidity sensors, etc. The sensors are not provided with a sealing effect when leaving the factory and all need to be assembled with a sealing device according to requirements.

[0078] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A sealing structure for a sensor, characterized in that: The sealing structure comprises: A sensor sealing base, wherein the sensor is placed in a chamber of the sensor sealing base; One end of the sensor sealing base is the test information transmission part; the other end is the sensor fixing part; The test information transmission part and the sensor fixing part are sealed and connected, and a sealing member is provided; Seals are selected based on the gas explosion test environment; A clamping structure is provided in the chamber of the sensor fixing part, which can fix the sensor in the gas explosion airflow. The clamping structure can adjust the distance between the sensor and the test position by adjusting the distance between the test information transmission part and the sensor fixing part.

2. A sealing structure for a sensor according to claim 1, characterized in that: The test information transmission part is fixedly connected with the sensor fixing part through a straight thread. The test information transmission part can be completely screwed into the sensor fixing part to control the distance that the sensor extends out of the sensor sealing base.

3. A sealing structure for a sensor according to claim 1, characterized in that: The test information transmission part is provided with a threaded copper column electrode, the threaded copper column electrode penetrates the test information transmission part, and two threaded copper column electrodes are provided at symmetrical positions; The threaded copper column electrode is equipped with nuts and washers at its end for connecting wires to transmit the electrical signals generated by the sensor to the data collector; the threaded copper column electrode is also equipped with nuts and washers at its bottom for connecting the wires of the sensor.

4. A sealing structure for a sensor according to claim 1, characterized in that: The seal is an O-ring or copper gasket. If the working environment temperature is lower than 200℃, use O-ring for sealing; If the working ambient temperature is higher than 200℃, copper gasket is used for sealing.

5. A sealing structure for a sensor according to claim 1, characterized in that: The sensor sealing base is made of 304 stainless steel throughout.

6. A sealing structure for a sensor according to claim 1, characterized in that: The chamber of the sensor fixing part is provided with a cylindrical channel with a diameter of 5 mm, which is used to place the sensor; An indented groove is provided in the chamber of the sensor fixing part for fixing the clamping structure; The outer side of the sensor fixing part is provided with threads, so the sealing base can be connected to different experimental instruments according to different experimental requirements.

7. A sealing structure for a sensor according to claim 1, characterized in that: The clamping structure is a polytetrafluoroethylene clamp.

8. An application of a sensor sealing structure in a closed pipeline gas explosion test based on any one of claims 1 to 7, characterized in that: A sealing structure is provided on the sensor to improve the accuracy of gas explosion testing.

9. The application of the sensor sealing structure in a closed pipeline gas explosion test according to claim 8, characterized in that: A sealing member is selected according to the gas explosion temperature and is arranged between the test information transmission part and the sensor fixing part; the distance between the test information transmission part and the sensor fixing part is adjusted so that the working end of the sensor is exposed 2 to 3 mm from the sensor sealing structure.

10. The application of the sensor sealing structure in a closed pipeline gas explosion test according to claim 8, characterized in that: When using an O-type sealing rubber ring, due to the ductility of the O-type sealant itself, when the head of the sealing base is screwed into the bottom of the sealing base, it is not necessary to provide excessive torque to achieve the sealing effect; When using a copper gasket, a large torque needs to be provided when the sealing base head is screwed into the sealing base bottom to deform the copper gasket, thereby achieving a sealing effect.

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