Airtightness tool and airtightness detection method for detecting inner end surface

Abstract

The present invention discloses an airtight tool and an airtight detection method for detecting an inner end face. The airtight tool for detecting an inner end face comprises a joint connector and a simulation rod. The joint connector is used to connect to one end of a part to be measured and can introduce compressed gas into the part to be measured. The two ends of the simulation rod respectively form a detection part and a fixing part. The detection part is used to connect to the measured inner end face of the part to be measured. The end size of the detection part is the same as the standard size of the measured inner end face of the part to be measured. The present invention designs a simulation rod with a standard size to cooperate with the measured inner end face, and at the same time utilizes the joint connector to inject compressed gas into the part to be measured to simulate an actual air pressure environment. The simulation rod is immersed in water to observe whether bubbles are generated to determine whether the gas is leaking, thereby realizing the detection of the part quality, effectively overcoming the problem that the internal space of the sleeve is limited, the measuring tool is difficult to enter or inconvenient to operate, and it is difficult to measure whether its end face is qualified.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness detection, and in particular to an airtightness detection tool and an airtightness detection method for detecting an inner end surface. Background Art

[0002] Engines include internal combustion engines (such as reciprocating piston engines), external combustion engines (such as Stirling engines and steam engines), jet engines, and electric motors. An engine is a machine that converts other forms of energy into mechanical energy and is an indispensable power source for modern transportation and industrial equipment. The operating status of an engine is directly related to the stability and safety of the entire system. During engine operation, pressure changes in the intake and exhaust systems have a crucial impact on the proper functioning of the equipment. Therefore, when using an engine, it is essential to install a pressure sensor for real-time pressure monitoring to ensure efficient and safe operation.

[0003] Chinese invention patent publication number CN102162406B provides a mounting structure for an engine cylinder pressure sensor. The structure includes a stepped mounting hole in the cylinder head that passes through a cooling water channel. The right end of the stepped mounting hole is threaded, and the right end communicates with the combustion chamber via an information collection channel. The inner wall of the sleeve is stepped, with threads threaded in the middle. The left and right outer walls of the sleeve are stepped, with an annular groove in the middle right portion. A sealing ring is located on the left side of the sleeve, and threads are provided on the right end. The sleeve mates with the stepped mounting hole, with the annular groove in the middle of the sleeve and the inner wall of the stepped mounting hole forming an annular cooling channel. The threads on the right end mate with threads on the inner wall of the right end of the mounting hole. The cylinder pressure sensor has a stepped shape and threads threaded in the middle left portion. The sleeve mates with the cylinder pressure sensor, and the wires connected to the cylinder pressure sensor extend from the sleeve. The pressure sensor is primarily mounted on the cylinder head via the sleeve to detect engine pressure.

[0004] In practical applications, the pressure sensor must be able to directly sense the pressure exerted by the measured medium. This direct perception is achieved through the sensor's probe or pressure sensitive element. Therefore, after installing the pressure sensor, its detection probe part must fit tightly with the inner wall end face of the sleeve to ensure that the pressure signal can be transmitted accurately. The sealing effect of the sleeve is achieved by making the end face of the stepped hole in the sleeve contact with the front end face of the pressure sensor. In order to ensure the accurate transmission of the pressure signal, precise measurement of the inner wall end face of the sleeve is an essential step. However, due to the small internal space of the sleeve, it is difficult for the measuring tool to enter or operate, so it is extremely difficult to measure whether its end face is qualified. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose an airtight tool and airtight detection method for detecting the inner end face, so as to solve the technical problem in the prior art that the internal space of the sleeve is limited, the measuring tool is difficult to enter or operate, and therefore it is difficult to measure whether its end face is qualified.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] In the first aspect, the present invention provides an airtight tool for detecting the inner end face, comprising: a joint connector and a simulation rod, wherein the joint connector is used to be connected to one end of the part to be measured, and can introduce compressed gas into the part to be measured to simulate the air pressure conditions; the two ends of the simulation rod respectively form a detection part and a fixing part, the detection part is used to connect to the measured inner end face of the part to be measured, the end size of the detection part is the same as the standard size of the measured inner end face of the part to be measured, and the fixing part is used to fix the position of the detection part and provide a passage connecting the inside and outside of the part to be measured for discharge when gas leaks.

[0008] In some embodiments, the fixing portion is provided with an air vent. When the detection portion is connected to the inner end face of the part to be measured, one end of the air vent is connected to the interior of the part to be measured, and the other end is located outside the part to be measured to form a passage for gas to be discharged when it leaks.

[0009] In some embodiments, the air vent includes a first inner hole and a second inner hole. The first inner hole is located at the center of the detection part and extends along the length direction of the simulation rod. The second inner hole is opened on the side wall of the simulation rod and is perpendicular to and connected to the first inner hole.

[0010] In some embodiments, the simulation rod forms a middle connecting section between the detection part and the fixing part, the second inner hole is arranged in the middle connecting section, and the outer diameter of the middle connecting section is smaller than the hole diameter of the corresponding position of the measured part.

[0011] In some embodiments, a thread groove is provided on the outer side of the fixing portion of the simulation rod for threaded connection with the measured part.

[0012] In some embodiments, the measured inner end face includes a first annular surface and a second annular surface that are perpendicular to each other, and the simulation rod is configured to match the standard dimensions of the first annular surface and the second annular surface so as to perform a surface contact sealing connection with the measured inner end face of the measured part when the detection part is connected to the measured inner end face of the measured part.

[0013] In some embodiments, the joint connector includes a conversion joint and an air pipe joint. The conversion joint is threadedly connected to one end of the part to be measured, and the air pipe joint is threadedly matched with the conversion joint and connected to the interior of the part to be measured to deliver compressed gas to the part to be measured.

[0014] In some embodiments, a sealing gasket is provided in one end of the conversion joint for connecting to the part to be measured, and the sealing gasket is configured to be placed between the conversion joint and the part to be measured when the conversion joint is connected to the part to be measured.

[0015] In some embodiments, the joint connector is disposed at one end of the measured part close to the measured inner end face.

[0016] In a second aspect, the present invention further provides a method for detecting an airtightness of an inner end surface, which is applicable to any of the above-mentioned airtightness tools for detecting an inner end surface and comprises the following steps:

[0017] S1: Install the joint connector and the simulation rod on the part to be measured respectively, connect the detection part of the simulation rod to the inner end surface of the part to be measured, fix the fixing part to the part to be measured to ensure the stability of the detection part, and connect the joint connector to one end of the part to be measured;

[0018] S2: Connect the joint connector to the air source equipment, and use the air source equipment to inject compressed air into the part under test through the joint connector;

[0019] S3: Immerse the analog rod in water and observe whether bubbles are generated. If bubbles are generated, it means the part is unqualified. If there are no bubbles, the part is qualified.

[0020] Compared with the prior art, the airtight tool and airtight detection method for detecting the inner end face provided by the present invention adopt an innovative simulation rod design for simulating the installation of a pressure sensor. The detection part of the simulation rod can be accurately positioned on the inner end face of the part to be tested, and the fixed part is used to ensure the stability of the position of the detection part to prevent displacement or offset during the detection process, and inject compressed gas into the interior of the part to be tested by setting a joint connector to detect whether the inner end face of the part meets the established quality standards. If the inner end face is unqualified, the compressed gas will be discharged through a specially reserved passage on the simulation rod. This scheme determines whether the gas is leaking by immersing the simulation rod in water and observing whether bubbles are generated, thereby realizing the detection of part quality. This detection method can be applied to parts with limited internal space, effectively overcoming the problem that the internal space of the sleeve is limited, the measuring tool is difficult to enter or inconvenient to operate, and it is difficult to measure whether its end face is qualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of an assembled airtight tool for detecting an inner end surface provided by an embodiment of the present invention;

[0022] Figure 2 This is an exploded view of an assembled airtight tool for detecting an inner end surface provided by an embodiment of the present invention;

[0023] Figure 3 1 is a schematic diagram of the main cross-sectional structure of an assembled airtight tool for detecting an inner end surface provided by an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the cross-sectional structure of the connection of the detection part of the simulated rod after the airtight tool for detecting the inner end surface provided by an embodiment of the present invention is assembled.

[0025] Description of reference numerals:

[0026] 1. Connector; 11. Adapter; 12. Trachea connector; 13. Sealing gasket;

[0027] 2. Simulation rod; 21. Detection part; 22. Fixing part; 23. Middle connecting section; 24. Ventilation hole; 241. First inner hole; 242. Second inner hole;

[0028] 3. Part to be measured; 31. Inner end face to be measured; 32. First annular surface; 33. Second annular surface. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] In order to solve the technical problem that the internal space of the sleeve is limited, the measuring tool is difficult to enter or inconvenient to operate, and thus it is difficult to measure whether its end face is qualified, the present invention provides an airtight tool and an airtight detection method for detecting the inner end face, which is designed with a simulation rod of standard size to cooperate with the inner end face to be measured, and at the same time, a joint connector is used to inject compressed gas into the part to be measured to simulate the actual air pressure environment, and the simulation rod is immersed in water to observe whether bubbles are generated to determine whether the gas is leaking, thereby realizing the detection of part quality. This detection method is applicable to parts with limited internal space, and effectively overcomes the problem that the internal space of the sleeve is limited, the measuring tool is difficult to enter or inconvenient to operate, and thus it is difficult to measure whether its end face is qualified.

[0031] It should be noted that the airtight tool and airtight detection method for detecting the inner end face described in the present invention are used for but not limited to the inner end face detection of the sleeve sensor. For the convenience of explanation, in the present invention, only the airtight tool and airtight detection method for detecting the inner end face are applied to the inner end face detection of the sleeve sensor as an example for explanation. The principle of applying the airtight tool and airtight detection method for detecting the inner end face to the inner end face detection of other types of parts is essentially the same as the principle applied to the inner end face detection of the sleeve sensor, and they will not be elaborated here.

[0032] See also Figures 1 to 3 In the first aspect, an embodiment of the present invention provides an airtight tool for detecting an inner end face, comprising: a joint connector 1 and a simulation rod 2, wherein the joint connector 1 is used to be connected to one end of a part to be measured 3, and can introduce compressed gas into the part to be measured 3 to simulate air pressure conditions; the two ends of the simulation rod 2 respectively form a detection part 21 and a fixing part 22, the detection part 21 is used to connect to the inner end face 31 to be measured of the part to be measured, and the end size of the detection part 21 is the same as the standard size of the inner end face 31 to be measured of the part to be measured 3, and the fixing part 22 is used to fix the position of the detection part 21, and provide a passage connecting the inside and outside of the part to be measured 3 for gas discharge when it leaks.

[0033] In this solution, a joint connector 1 and a simulation rod 2 are designed, and the two ends of the simulation rod 2 form a detection part 21 and a fixing part 22 respectively. The detection part 21 is used to connect with the inner end face of the sensor sleeve, and its end size is the same as the standard size of the inner end face of the sensor sleeve, ensuring that the detection part 21 can be accurately positioned on the inner end face of the sensor sleeve, facilitating accurate measurement; the fixing part 22 is used to be fixedly connected to the sensor sleeve to ensure that the position of the detection part 21 is stable to prevent displacement or offset during the detection process; the joint connector 1 is connected to one end of the sensor sleeve, and its main function is to introduce compressed gas into the inside of the sensor sleeve, thereby simulating the air pressure conditions in actual work. In this way, the performance of the parts under actual working pressure can be tested. In order to realize the detection of gas leakage, the fixing part 22 of the simulation rod 2 is also designed with a passage, which can connect the inside and outside of the sensor sleeve, so that when a gas leak occurs, the gas can be discharged through the passage, thereby facilitating the inspection personnel to observe and measure the leakage.

[0034] It should be noted that, to ensure a smooth measurement process and accurate results, the part 3 to be measured in this embodiment should be a sleeve-like structure with an inner hole extending through both ends. This allows the simulated rod 2 to enter from one end of the part 3 to directly contact the inner end surface 31 to be tested. The other end of the part 3 to be measured can be connected to the connector 1, ensuring that compressed gas can flow into the part 3 to simulate the air pressure conditions in actual operation. Preferably, in this embodiment, the part 3 to be measured is a sensor sleeve.

[0035] In order to ensure the reliability of the test results, the present invention also provides a complete set of test procedures. First, the simulation rod 2 is fixedly installed in the sensor sleeve to ensure that the end face of the detection portion 21 of the simulation rod 2 is aligned with the inner end face 31 of the sensor sleeve to be tested. Then, the sensor sleeve is connected to the joint connector 1 to ensure that the connection is tightly connected. Then, compressed gas is introduced into the sensor sleeve to detect the inner end face through the detection portion 21 of the simulation rod 2. During the test process, the simulation rod 2 is immersed in water to observe whether bubbles are generated in the water, thereby determining whether there is a leak. Once bubbles are found, it can be determined that there is a leak point on the inner end face 31 of the sensor sleeve to be tested, and the sensor sleeve can be judged to be unqualified. On the contrary, if no bubbles are generated, the sensor sleeve can be judged to be qualified.

[0036] To ensure that the gas can be discharged smoothly from the sensor sleeve in the event of a leak, so that the operator can observe it, please refer to Figure 2 In this embodiment, a vent hole 24 is provided on the fixed portion 22 of the sensor sleeve. The provision of the vent hole 24 forms the passage through which gas can be discharged in the event of a leak. When the detection portion 21 of the analog rod 2 is connected to the inner end surface 31 of the part 3 being tested, one end of the vent hole 24 communicates with the interior space of the part 3 being tested, while the other end of the vent hole 24 is located outside the part 3 being tested, thereby forming a complete gas discharge path. Therefore, when compressed gas leaks from the interior of the part 3 being tested into the inner bore of the sensor sleeve, the gas can be smoothly discharged into the external environment through the vent hole 24, thus achieving airtightness testing.

[0037] See also Figure 3In some specific embodiments, the vent hole 24 includes two main parts, namely a first inner hole 241 and a second inner hole 242. The first inner hole 241 is precisely positioned at the center of the detection portion 21 and extends along the length of the analog rod 2. The second inner hole 242 is opened on the side wall of the analog rod 2, perpendicular to the first inner hole 241, and the two are interconnected, so that the vent hole 24 can smoothly discharge the compressed gas inside the sensor sleeve. In addition, between the detection part 21 and the fixing part 22, the simulation rod 2 forms a middle connecting section 23, and the second inner hole 242 is arranged on the middle connecting section 23. The outer diameter of the middle connecting section 23 is designed to be smaller than the aperture of the corresponding position of the measured part 3, so that when the detection part 21 of the simulation rod 2 is connected to the measured inner end face 31 of the sensor sleeve, a certain space is reserved between the middle connecting section 23 of the simulation rod 2 and the sensor sleeve, which can accommodate the leaked compressed gas when the design of the measured inner end face 31 is unqualified, and the space is connected to the second inner hole 242, which can guide the compressed gas into the second inner hole 242, and finally discharged to the outside through the first inner hole 241, so that the user can judge the qualification of the measured inner end face 31 of the sensor sleeve according to the gas leakage situation.

[0038] Of course, in other possible embodiments, other methods can be used to provide a passageway so that gas can be discharged through the passageway in the event of a leak. For example, a notch can be provided between the detection portion 21 of the simulated rod 2 and the outer side of the middle connecting section 23, or the detection portion 21 and the middle connecting section 23 can be designed to be at least partially smaller than the corresponding portion of the inner hole of the sensor sleeve. This allows the detection portion 21 of the simulated rod 2 to be connected to the inner end surface 31 of the sensor sleeve to form a passageway for exhaust between the outer side of the simulated rod 2 and the inner sidewall of the sensor sleeve. This allows the simulated rod 2 to be immersed in water and the generation of bubbles to determine whether the inner end surface 31 is qualified.

[0039] In order to ensure that the position of the simulation rod 2 can be stably fixed during the detection process and avoid any displacement or offset that affects the accuracy of the detection, in this embodiment, a threaded connection is used to fix the simulation rod 2. For details, please refer to Figure 3 The fixing portion 22 of the simulation rod 2 is designed with an external thread groove, and the inner side of one end of the sensor sleeve is provided with an internal thread groove that matches it. By accurately matching the external thread groove with the internal thread groove, a threaded connection between the simulation rod 2 and the sensor sleeve can be achieved. This connection method not only ensures the stable fixation of the position of the simulation rod 2, but also by screwing the thread, the detection portion 21 can be easily screwed to fit tightly against the inner end face 31 to be measured, so that the detection portion 21 can be firmly positioned in the correct position, thereby greatly improving the accuracy and reliability of the detection results.

[0040] It should be noted that in other possible embodiments, the above-mentioned fixing method of the simulation rod 2 and the sensor sleeve, in addition to the threaded connection method, can also be connected to the sensor sleeve through a snap mechanism or other types of mechanical connection methods to ensure that the simulation rod 2 can maintain its stability during the installation and testing process.

[0041] See also Figures 1 to 4 In this embodiment, the measured inner end face 31 includes a first annular surface 32 and a second annular surface 33 that are perpendicular to each other. In order to achieve precise matching with the measured inner end face 31, the simulation rod 2 is configured to match the standard dimensions of the first annular surface 32 and the second annular surface 33. This design enables the simulation rod 2 to be connected to the measured inner end face 31 of the measured part 3 in a surface contact and sealed connection with the measured inner end face 31 of the measured part 3. In this way, the simulation rod 2 can be used as a standard part to simulate the connection between the pressure sensor and the sensor sleeve. In the actual detection process, if it can be ensured that at least one of the first annular surface 32 and the second annular surface 33, or both of the annular surfaces can simultaneously match the detection portion 21 of the simulation rod 2, then it can be considered that the relevant requirements of the detection are met.

[0042] To improve detection flexibility and adaptability, in other possible embodiments, the detection portion 21 of the simulated rod 2 can be designed to be replaceable. When detecting inner end surfaces 31 of different sizes or shapes, the detection portion 21 of the corresponding size or shape can be replaced, eliminating the need to replace the entire simulated rod 2. This design not only saves costs but also improves detection efficiency, making the simulated rod 2 applicable to a variety of different detection scenarios.

[0043] Preferably, see Figures 1 to 3 In this embodiment, the connector 1 includes a conversion joint 11 and an air pipe joint 12. The conversion joint 11 is threadedly connected to one end of the part 3 under test, while the air pipe joint 12 is threadedly connected to the conversion joint 11. This ensures a secure and leak-tight connection while also facilitating disassembly and maintenance. Furthermore, the air pipe joint 12 is connected to the interior of the part 3 under test and is used to connect to an air source device, conveniently delivering compressed air to the interior of the part 3 under test, effectively performing airtightness testing on the part.

[0044] It should be noted that the gas source equipment used to deliver compressed gas to the inside of the tested part 3 through the air pipe connector 12 is not restricted here. The gas source equipment should have sufficient pressure output capacity to meet different testing requirements. It can be any type of compressed gas supply system, such as an air compressor or gas storage tank / bottle and other various devices for generating, processing and supplying gas. Among them, the air compressor is one of the most common gas source equipment, which is used to compress ambient air to a higher pressure for various purposes, and the gas storage tank / bottle is used to store compressed gas to ensure that the gas can be supplied at any time when needed.

[0045] In practice, the air source equipment is also equipped with a pressure regulating valve. Its primary purpose is to precisely control and adjust the pressure of the gas delivered to the part under test (DUT). This significantly improves the accuracy and safety of the test process. During testing, the operator can finely adjust the air source pressure to accommodate the pressure adaptability of the DUT (DUT) with varying specifications and requirements, thus providing a strong guarantee for product quality control.

[0046] Further, see Figure 3 and Figure 4 In some embodiments, a sealing gasket 13 is disposed within one end of the adapter 11 for connection to the part 3 under test. When the adapter 11 is connected to the part 3 under test, the sealing gasket 13 can be positioned between the adapter 11 and the part 3 under test. During implementation, the adapter 11 is threadedly screwed onto the sensor sleeve, allowing the adapter 11 to move toward the sensor sleeve and thereby compressing the sealing gasket 13 between the adapter 11 and the sensor sleeve. This design, through the sealing gasket 13, enhances the sealing performance of the connection between the adapter 11 and the sensor sleeve, effectively preventing gas leakage and ensuring the accuracy of test results when performing pressure tests of varying scales.

[0047] Furthermore, in order to adapt to different types of parts 3 to be tested, the design of the conversion joint 11 in this solution includes interfaces of various sizes and shapes to meet the requirements of different specifications and standards.

[0048] In this embodiment, the joint connector 1 is provided at one end of the part to be tested 3 close to the inner end face 31 to be tested. The opening at this end of the part to be tested 3 is designed to be relatively small so as to limit and fix the detection portion 21 of the simulation rod 2, while the opening at the other end of the part to be tested 3 is relatively large, thereby allowing the simulation rod 2 to smoothly extend into the interior of the part to be tested 3, and after extending, it can be installed in a suitable position. During the installation process, the thread on the outside of the fixing portion 22 can be used to connect to the part to be tested. In this way, the simulation rod 2 can be ensured to be correctly installed in place, achieving a stable fixing effect, and ensuring the stability and accuracy of the entire test process, thereby improving the reliability of the test results.

[0049] It is understood that in this solution, in order to meet the process requirements of airtightness testing, the simulated rod 2 is generally made of high-strength alloy steel. This material not only has excellent mechanical properties but can also withstand the high pressure and high temperature environments that may occur during the test. In addition, the working end face of the simulated rod 2 is precision machined and its surface roughness is finely polished to ensure that its dimensional accuracy, positional accuracy, and surface roughness meet the design requirements. This allows the simulated rod 2 to effectively simulate the installation state under actual working conditions during testing, providing a more realistic and rigorous testing environment for airtightness testing, thereby ensuring product quality.

[0050] The above embodiments are merely multiple possible implementations of the embodiments of the present application, and the embodiments of the present application are not limited thereto.

[0051] In a second aspect, an embodiment of the present invention further provides an airtightness detection method for detecting an inner end surface, which is applicable to the airtightness detection tool for detecting an inner end surface as described in any of the above embodiments, and includes the following steps:

[0052] S1: Install the joint connector 1 and the simulation rod 2 on the part to be measured 3 respectively, with the detection portion 21 of the simulation rod 2 connected to the inner end surface 31 of the part to be measured 3, and the fixing portion 22 fixed to the part to be measured 3 to ensure that the position of the detection portion 21 is stable, and the joint connector 1 is connected to one end of the part to be measured 3;

[0053] S2: Connect the joint connector 1 to the air source equipment, and inject the compressed air into the part 3 under test through the joint connector 1 through the air source equipment;

[0054] S3: Immerse the analog rod 2 in water and observe whether bubbles are generated. If bubbles are generated, it means the part is unqualified; if there are no bubbles, the part is qualified.

[0055] In order to better understand the present invention, the following Figures 1 to 4 A more specific embodiment is provided to explain the technical solution of the present invention in detail, which specifically includes the following steps:

[0056] Step 1. Install the joint connector 1 and the simulation rod 2: First, accurately align the detection part 21 of the simulation rod 2 with the inner hole of the outer end of the sensor sleeve. Then, insert the simulation rod 2 into the inner hole of the sensor sleeve. After insertion, the simulation rod 2 needs to be rotated so that the external thread of the fixing part 22 of the simulation rod 2 is tightly matched with the internal thread of the inner wall of the sensor sleeve to achieve a threaded connection. During the connection process, the simulation rod 2 needs to be screwed in continuously until the detection part 21 is completely pressed against the measured inner end face 31 of the other end of the sensor; after completing this step, the conversion joint 11 needs to be threadedly connected and tightened to the other end of the sensor sleeve. During the tightening process, ensure that the sealing gasket 13 can be evenly compressed between the sensor sleeve and the conversion joint 11 to ensure the sealing of the connection. Finally, the trachea joint 12 is tightened and installed on the other end of the conversion joint 11 to ensure the airtightness of its connection.

[0057] Step 2: Inject compressed gas: Connect the air pipe connector 12 to the air source device, then start the air source device, and inject compressed air into the interior of the sensor sleeve through the air pipe connector 12 connector 1. During this process, the pressure of the air source device can be adjusted to perform pressure adaptability tests on the tested parts 3 of different specifications.

[0058] Step 3: Perform an airtightness immersion test: Completely immerse the simulated rod 2 in water. If the inner end surface machining quality of the tested part 3 does not meet the standard, compressed air will penetrate into the inner hole of the sensor sleeve through the gap between the inner end surface of the sensor sleeve and the simulated rod 2. When the compressed air enters the inner hole through these gaps, it will emerge through the air vent 24 of the simulated rod 2, forming visible bubbles. Therefore, if bubbles are observed in the passage of the simulated rod 2, it indicates that there is a defect in the machining of the inner end surface of the part, and therefore the tested inner end surface 31 of the sensor sleeve is unqualified. Conversely, if no bubbles are observed in the air vent 24 of the simulated rod 2, it can be determined that the machining of the inner end surface of the sensor sleeve meets the quality standards, and therefore the part is qualified.

[0059] Step 4: After the test is completed, turn off the gas source equipment, disconnect the joint connector 1 from the gas source equipment, and remove the conversion joint 11, the air pipe joint 12 and the simulation rod 2 from the tested part 3.

[0060] Step 5. Record the test results and mark unqualified parts for subsequent rework or scrapping. For qualified parts, proceed to the next assembly or use process to ensure that the overall quality of the product meets the standards.

[0061] The present invention adopts an innovative simulation rod 2 design for simulating the installation of a pressure sensor. The detection part 21 of the simulation rod 2 can be accurately positioned on the inner end face of the part to be tested 3, and the fixing part 22 is used to ensure the stability of the position of the detection part to prevent displacement or offset during the detection process, and inject compressed gas into the interior of the part to be tested 3 by setting a joint connector 1 to detect whether the inner end face of the part meets the established quality standards. If the inner end face is unqualified, the compressed gas will be discharged through a specially reserved passage on the simulation rod 2. This solution determines whether the gas is leaking by immersing the simulation rod 2 in water and observing whether bubbles are generated, thereby realizing the detection of part quality. This detection method can be applied to parts with limited internal space, effectively overcoming the problem that the internal space of the sleeve is limited, the measuring tool is difficult to enter or inconvenient to operate, and it is difficult to measure whether its end face is qualified.

[0062] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0063] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0064] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A gas-tight tool for detecting an inner end surface, characterized in that: include: A joint connector, the joint connector being used to connect to one end of the part to be tested, and capable of introducing compressed gas into the part to be tested to simulate air pressure conditions; as well as, The simulation rod has two ends forming a detection part and a fixing part respectively. The detection part is used to connect to the inner end face of the measured part. The end size of the detection part is the same as the standard size of the inner end face of the measured part. The fixing part is used to fix the position of the detection part and provide a passage connecting the inside and outside of the measured part for discharge when gas leaks.

2. The airtight tool for detecting the inner end surface according to claim 1, characterized in that: The fixing part is provided with an air vent. When the detection part is connected to the inner end surface of the measured part, one end of the air vent is connected to the interior of the measured part, and the other end is located outside the measured part to form a passage for gas discharge when it leaks.

3. The airtight tool for detecting the inner end surface according to claim 2, characterized in that: The air vent includes a first inner hole and a second inner hole. The first inner hole is located at the center of the detection part and extends along the length direction of the simulation rod. The second inner hole is opened on the side wall of the simulation rod and is perpendicular to and connected to the first inner hole.

4. The airtight tool for detecting the inner end surface according to claim 3, characterized in that: The simulation rod forms a middle connecting section between the detection part and the fixing part, the second inner hole is set in the middle connecting section, and the outer diameter of the middle connecting section is smaller than the hole diameter of the corresponding position of the measured part.

5. The airtight tool for detecting an inner end surface according to claim 1, characterized in that: A thread groove for threaded connection with the measured part is provided on the outer side of the fixing portion of the simulation rod.

6. The airtight tool for detecting an inner end surface according to claim 1, characterized in that: The measured inner end face includes a first annular face and a second annular face that are perpendicular to each other, and the simulation rod is configured to match the standard dimensions of the first annular face and the second annular face, so as to perform a surface contact sealing connection with the measured inner end face of the measured part when the detection part is connected to the measured inner end face of the measured part.

7. The airtight tool for detecting an inner end surface according to claim 1, characterized in that: The joint connector includes a conversion joint and an air pipe joint. The conversion joint is threadedly connected to one end of the part to be measured. The air pipe joint is threadedly matched with the conversion joint and is connected to the interior of the part to be measured to transport compressed gas into the part to be measured.

8. The airtight tool for detecting the inner end surface according to claim 7, characterized in that: A sealing gasket is provided in one end of the conversion joint for connecting to the part to be measured, and the sealing gasket is configured to be placed between the conversion joint and the part to be measured when the conversion joint is connected to the part to be measured.

9. The airtight tool for detecting the inner end surface according to claim 8, characterized in that: The joint connector is arranged at one end of the measured part close to the measured inner end face.

10. A method for detecting airtightness of an inner end surface, characterized in that: The airtight tool for detecting the inner end surface is applicable to any one of claims 1 to 9, and comprises the following steps: S1: Install the joint connector and the simulation rod on the part to be measured respectively, connect the detection part of the simulation rod to the inner end surface of the part to be measured, fix the fixing part to the part to be measured to ensure the stability of the detection part, and connect the joint connector to one end of the part to be measured; S2: Connect the joint connector to the air source equipment, and use the air source equipment to inject compressed air into the part under test through the joint connector; S3: Immerse the analog rod in water and observe whether bubbles are generated. If bubbles are generated, it means the part is unqualified. If there are no bubbles, the part is qualified.

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