Airtightness tool for detecting inner end face and airtightness detection method

Abstract

The invention discloses an airtight tool for detecting an inner end face and an airtight detection method, the airtight tool for detecting the inner end face comprises a joint connecting piece and a simulation rod, and the joint connecting piece is used for being connected with one end of a detected part and can introduce compressed gas into the detected part; a detection part and a fixing part are formed at the two ends of the simulation rod respectively, the detection part is used for being connected with a detected inner end face of a detected part, and the size of the end portion of the detection part is the same as the standard size of the detected inner end face of the detected part. Meanwhile, compressed gas is injected into the detected part through the joint connecting piece to simulate the actual air pressure environment, and whether gas leaks or not is judged by immersing the simulation rod into water to observe whether bubbles are generated or not, so that the quality of the part is detected, and the defects that the internal space of the sleeve is limited, and the detection precision is high are effectively overcome. A measuring tool is difficult to enter or inconvenient to operate, and whether the end face is qualified is difficult to measure.

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, steam engines, etc.), jet engines, electric motors, etc. An engine is a machine that can convert other forms of energy into mechanical energy. It is an indispensable power source in modern transportation and industrial equipment. The operating state of the engine is directly related to the stability and safety of the entire system. During the operation of the engine, the pressure changes in the intake and exhaust systems have an extremely important impact on the normal operation of the equipment. Therefore, when using the engine, a pressure sensor must be installed for real-time pressure detection to ensure the efficient and safe operation of the engine.

[0003] The Chinese invention patent with announcement number CN102162406B provides an installation structure for an engine cylinder pressure sensor, including a stepped installation hole provided on the cylinder head and passing through the cooling water channel on the cylinder head, the inner wall of the right end of the stepped installation hole is provided with a thread, and the right end of the stepped installation hole is connected to the combustion chamber through the information collection channel. The inner wall of the sleeve is stepped, and the middle part of the inner wall of the sleeve is provided with a thread; the left and right parts of the outer wall of the sleeve are stepped, and an annular groove is provided in the middle right part, a sealing ring is provided at the left position of the sleeve, and a thread is provided at the right end; the sleeve is matched with the stepped installation hole, the annular groove in the middle of the sleeve and the inner wall of the stepped installation hole form an annular cooling channel, and the thread at the right end is matched with the thread of the inner wall of the right end of the installation hole; the cylinder pressure sensor has a stepped shape, and the middle left part is provided with a thread; the cylinder pressure sensor is matched with the sleeve, and the wire connected to the cylinder pressure sensor is led out from the sleeve. It can be seen that the pressure sensor is mainly installed on the cylinder head through the sleeve to realize the pressure detection of the engine.

[0004] In practical applications, the pressure sensor must be able to directly sense the pressure applied by the measured medium. This direct perception is accomplished 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 an 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: In the first aspect, the present invention provides an airtight tool for detecting inner end faces, comprising: a joint connector and a simulation rod, wherein the joint connector is used to connect to one end of the part to be measured, and can introduce compressed gas into the part to be measured to simulate 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.

[0007] In some embodiments, the fixing portion is provided with an air hole. When the detection portion is connected to the inner end surface of the measured part, one end of the air hole 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.

[0008] 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 portion 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.

[0009] 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.

[0010] In some embodiments, a thread groove for threaded connection with the measured part is provided on the outer side of the fixing portion of the simulation rod.

[0011] 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 provide 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.

[0012] 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.

[0013] In some embodiments, a sealing gasket is disposed in one end of the conversion joint for connecting to the measured part, and the sealing gasket is configured to be placed between the conversion joint and the measured part when the conversion joint is connected to the measured part.

[0014] In some embodiments, the joint connector is disposed at one end of the measured part close to the measured inner end face.

[0015] In a second aspect, the present invention further provides an airtightness detection method for detecting an inner end surface, which is applicable to any of the airtightness tools for detecting an inner end surface as described above, and comprises the following steps: S1: The joint connector and the simulation rod are respectively installed on the measured part, the detection part of the simulation rod is connected to the measured inner end surface of the measured part, the fixing part is fixed together with the measured part to ensure the stability of the position of the detection part, and the joint connector is connected with one end of the measured part; S2: Connect the joint connector to the air source device, and inject compressed air into the tested part through the joint connector through the air source device; S3: Immerse the analog rod in water and observe whether bubbles are generated. If bubbles are generated, it means the part is unqualified, and if there are no bubbles, the part is qualified.

[0016] 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 fixing 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 operate, and it is difficult to measure whether its end face is qualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the assembled airtight tool for detecting the inner end surface provided by an embodiment of the present invention; Figure 2 is an exploded view of an assembled airtight tool for detecting an inner end surface provided by an embodiment of the present invention; Figure 3 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; Figure 4 It is a schematic diagram of the connection cross-sectional structure 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.

[0018] Description of reference numerals: 1. Connector; 11. Adapter; 12. Air pipe connector; 13. Sealing gasket; 2. Simulation rod; 21. Detection part; 22. Fixing part; 23. Middle connecting section; 24. Air vent; 241. First inner hole; 242. Second inner hole; 3. Part to be measured; 31. Inner end face to be measured; 32. First annular surface; 33. Second annular surface. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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.

[0020] In order to solve the technical problem that the internal space of the sleeve is limited, the measuring tool is difficult to enter or is 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 can be applied 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 is inconvenient to operate, and thus it is difficult to measure whether its end face is qualified.

[0021] 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, which will not be elaborated here.

[0022] See also Figures 1 to 3In 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 3 to be measured, and can introduce compressed gas into the part 3 to simulate air pressure conditions; the two ends of the simulation rod 2 respectively form a detection portion 21 and a fixing portion 22, the detection portion 21 is used to connect to the inner end face 31 to be measured of the part 3 to be measured, and the end size of the detection portion 21 is the same as the standard size of the inner end face 31 to be measured of the part 3 to be measured, and the fixing portion 22 is used to fix the position of the detection portion 21, and provide a passage connecting the inside and outside of the part 3 to be measured for gas discharge when leakage occurs.

[0023] 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 with the sensor sleeve to ensure the stable position of the detection part 21 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 detection personnel to observe and measure the leakage.

[0024] It should be noted that, in order to ensure the smooth progress of the measurement process and the accuracy of the results, the measured part 3 in this solution should be a sleeve-type structure with an inner hole running through both ends, so that the simulation rod 2 can enter from one end of the measured part 3 and directly contact the measured inner end face 31 for detection, and the other end of the measured part 3 can be connected to the joint connector 1 to ensure that compressed gas can be passed into the measured part 3 to achieve the purpose of simulating the air pressure conditions in actual work. Preferably, in this embodiment, the measured part 3 is a sensor sleeve.

[0025] 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 part 21 of the simulation rod 2 is matched with the inner end face 31 of the sensor sleeve to be tested. Then, the sensor sleeve is connected to the joint connector 1 and the connection is ensured to be tightly connected. Then, compressed gas is introduced into the sensor sleeve to detect the inner end face through the detection part 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, so as to determine 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 is judged to be qualified.

[0026] 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, refer to Figure 2 In this embodiment, a vent hole 24 is provided on the fixing portion 22 of the sensor sleeve, and the provision of the vent hole 24 forms the passage so that the gas can be discharged through the passage when leaking. When the detection portion 21 of the analog rod 2 is connected to the inner end face 31 of the measured part 3, one end of the vent hole 24 will be connected to the internal space of the measured part 3, and the other end of the vent hole 24 will be located outside the measured part 3, thereby forming a complete gas discharge path. Therefore, when the compressed gas leaks from the inside of the measured part 3 to the inner hole of the sensor sleeve, the gas can be smoothly discharged into the external environment through the vent hole 24 to achieve air tightness detection.

[0027] 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 part 21 and is extended along the length direction of the analog rod 2, while the second inner hole 242 is opened on the side wall of the analog rod 2 and is perpendicular to the first inner hole 241. The two are interconnected, so that the vent hole 24 can smoothly discharge the compressed gas inside the sensor sleeve. Furthermore, between the detection portion 21 and the fixing portion 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 portion 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 measured inner end face 31 is not designed to be qualified, and the space is connected to the second inner hole 242, which can guide the compressed gas to enter the second inner hole 242, and finally be 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.

[0028] Of course, in other possible embodiments, a passage can be provided in other ways so that the gas can be discharged through the passage when leaking. For example, a notch is provided between the detection portion 21 of the analog rod 2 and the outer side of the middle connecting section 23, or the size of the detection portion 21 and the middle connecting section 23 is designed to be at least partially smaller than the size of the corresponding part of the inner hole of the sensor sleeve, so that when the detection portion 21 of the analog rod 2 is connected to the inner end face 31 to be measured of the sensor sleeve, a passage for exhaust can be formed between the outer side of the analog rod 2 and the inner side wall of the sensor sleeve, so that the analog rod 2 can be immersed in water and whether the inner end face 31 to be measured is qualified can be judged by whether bubbles are generated.

[0029] In order to ensure that the position of the simulation rod 2 can be stably fixed during the detection process to 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 analog 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 matching it. By accurately matching the external thread groove with the internal thread groove, a threaded connection between the analog rod 2 and the sensor sleeve can be achieved. This connection method not only ensures the stable fixation of the position of the analog 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.

[0030] It should be noted that in other possible embodiments, the above-mentioned simulation rod 2 and the sensor sleeve can be fixed together by a snap-fit ​​mechanism or other types of mechanical connection methods in addition to the threaded connection, so as to ensure that the simulation rod 2 can maintain its stability during the installation and detection process.

[0031] 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 which 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 sizes 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 the two annular surfaces can simultaneously match the detection part 21 of the simulation rod 2, then it can be considered that the relevant requirements of the detection are met.

[0032] In order to improve the flexibility and adaptability of detection, in other possible embodiments, the detection portion 21 of the analog rod 2 can be designed to be a replaceable structure. When detecting the inner end surface 31 of different sizes or shapes, the detection portion 21 of the corresponding size or shape can be replaced, thereby eliminating the need to replace the entire analog rod 2. This design not only saves costs, but also improves detection efficiency, so that the analog rod 2 can be applied to a variety of different detection scenarios.

[0033] Preferably, see Figures 1 to 3 In this embodiment, the joint 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 tested part 3, and the air pipe joint 12 is threadedly connected to the conversion joint 11, which ensures the stability and sealing of the connection and is also convenient for disassembly and maintenance. In addition, the air pipe joint 12 is connected to the inside of the tested part 3. The air pipe joint 12 is used to connect the air source equipment, which can easily deliver compressed gas to the inside of the tested part 3, and can effectively perform air tightness test on the part.

[0034] It should be noted that the gas source equipment used to transport 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.

[0035] In actual applications, the gas source equipment is also equipped with a pressure regulating valve for use, the main purpose of which is to accurately control and adjust the gas pressure delivered to the inside of the tested part 3, which can greatly improve the accuracy and safety of the test process. During the test, the operator can finely adjust the pressure of the gas source equipment to adapt to the pressure adaptability test of the tested parts 3 of different specifications and requirements, thereby providing a strong guarantee for product quality control.

[0036] For further information, see Figure 3 and Figure 4 In some embodiments, a sealing gasket 13 is disposed in one end of the conversion joint 11 for connecting the measured part 3. When the conversion joint 11 is connected to the measured part 3, the sealing gasket 13 can be placed between the conversion joint 11 and the measured part 3. During implementation, the conversion joint 11 is screwed onto the sensor sleeve by threaded connection, so that the conversion joint 11 can be moved toward the sensor sleeve, and the sealing gasket 13 is pressed between the conversion joint 11 and the sensor sleeve. This design enhances the sealing performance of the connection between the conversion joint 11 and the sensor sleeve through the sealing gasket 13, effectively prevents gas leakage, and ensures the accuracy of the test results when performing pressure tests of different scales.

[0037] Furthermore, in order to adapt to different types of measured parts 3, 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.

[0038] In this embodiment, the joint connector 1 is arranged at one end of the measured part 3 close to the measured inner end face 31, and the opening of this end of the measured part 3 is designed to be relatively small, so as to limit and fix the detection part 21 of the simulation rod 2, while the opening of the other end of the measured part 3 is relatively large, so as to allow the simulation rod 2 to smoothly extend into the interior of the measured part 3, and after extending, it can be installed in a suitable position. During the installation process, the thread on the outside of the fixing part 22 can be used to connect with the part to be tested. In this way, it can be ensured that the simulation rod 2 is correctly installed in place, and a stable fixing effect can be achieved, which can ensure the stability and accuracy of the entire test process, thereby improving the reliability of the test results.

[0039] It is understandable that in this solution, in order to meet the process requirements of air tightness detection, the simulation rod 2 is usually made of high-strength alloy steel material, which not only has good mechanical properties, but also can withstand the high pressure and high temperature environment that may occur during the test. In addition, the working end face of the simulation rod 2 is precision machined, and the surface roughness is also finely polished to ensure that its dimensional accuracy, position accuracy and surface roughness meet the design requirements, so that the simulation rod 2 can effectively simulate the installation state under actual working conditions during detection, providing a more realistic and strict test environment for air tightness detection, thereby ensuring the quality of the product.

[0040] 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.

[0041] 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 tool for detecting an inner end surface as described in any one of the above embodiments, and comprises the following steps: S1: The joint connector 1 and the simulation rod 2 are respectively installed on the measured part 3, the detection part 21 of the simulation rod 2 is connected to the measured inner end surface 31 of the measured part 3, and the fixing part 22 is fixed to the measured part 3 to ensure that the position of the detection part 21 is stable, and the joint connector 1 is connected to one end of the measured part 3; S2: Connect the joint connector 1 to the air source device, and inject the compressed air into the tested part 3 through the joint connector 1 through the air source device; S3: Immerse the analog rod 2 in water and observe whether bubbles are generated. If bubbles are generated, it means the part is unqualified, and if there are no bubbles, the part is qualified.

[0042] 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: Step 1, install the joint connector 1 and the analog rod 2: first, accurately align the detection part 21 of the analog rod 2 with the inner hole at the outer end of the sensor sleeve, then, insert the analog rod 2 into the inner hole of the sensor sleeve. After insertion, the analog rod 2 needs to be rotated so that the external thread of the fixing part 22 of the analog 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 analog rod 2 needs to be screwed in continuously until the detection part 21 is completely pressed against the measured inner end face 31 at the other end of the sensor. After completing this step, the conversion joint 11 needs to be threadedly connected and tightened on 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 air pipe joint 12 is tightened and installed on the other end of the conversion joint 11 to ensure the airtightness of the connection.

[0043] Step 2, injecting compressed gas: connect the air pipe joint 12 to the air source equipment, then start the air source equipment, and inject compressed air into the interior of the sensor sleeve through the air pipe joint 12 connector 1. In this process, the pressure of the air source equipment can be adjusted to perform pressure adaptability tests on the tested parts 3 of different specifications.

[0044] Step 3: Perform airtightness immersion test: Immerse the simulation rod 2 completely in water. If the inner end surface processing quality of the tested part 3 does not meet the standard, the 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 simulation rod 2. When the compressed air enters the inner hole through these gaps, it will emerge through the air holes 24 of the simulation rod 2 to form visible bubbles. Therefore, if bubbles are observed in the passage of the simulation rod 2, it indicates that there are defects in the processing of the inner end surface of the part, so the tested inner end surface 31 of the sensor sleeve is unqualified; on the contrary, if no bubbles are observed in the air holes 24 of the simulation rod 2, it can be determined that the inner end surface processing of the sensor sleeve meets the quality standards, so the part is qualified.

[0045] 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.

[0046] Step 5: Record the test results and mark the 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.

[0047] The present invention adopts an innovative simulation rod 2 design for simulating the installation of a pressure sensor. The detection portion 21 of the simulation rod 2 can be accurately positioned on the inner end face of the part 3 to be tested, and the fixing portion 22 is used to ensure the stability of the position of the detection portion to prevent displacement or offset during the detection process. The joint connector 1 is provided to inject compressed gas into the interior of the part 3 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 detects the quality of the part by immersing the simulation rod 2 in water and observing whether bubbles are generated to determine whether the gas is leaking. 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 operate, and it is difficult to measure whether its end face is qualified.

[0048] In the description of the present 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 the present application and simplifying the description, rather than indicating or implying 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 the present 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0049] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such 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 including 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, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0050] The specific implementation of the present invention described above does not constitute a limitation on the protection scope 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 protection scope 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, which is used to connect to one end of the part to be tested and can introduce 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 gas discharge when leaking.

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 hole. When the detection part is connected to the inner end surface of the measured part, one end of the air hole 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 communicated with 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 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.

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

6. The airtight tool for detecting the 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 sizes of the first annular face and the second annular face so as to be provided with 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 the 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 measured part. The air pipe joint is threadedly matched with the conversion joint and is connected to the inside of the measured part to transport compressed gas into the measured part.

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

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 surface.

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: The joint connector and the simulation rod are respectively installed on the measured part, the detection part of the simulation rod is connected to the measured inner end surface of the measured part, the fixing part is fixed together with the measured part to ensure the stability of the position of the detection part, and the joint connector is connected with one end of the measured part; S2: Connect the joint connector to the air source device, and inject compressed air into the part to be tested through the joint connector through the air source device; S3: Immerse the analog rod in water and observe whether bubbles are generated. If bubbles are generated, it means the part is unqualified, and if there are no bubbles, the part is qualified.

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