Digital cylinder leak detector

Abstract

This utility model discloses a digital cylinder leak detector, belonging to the technical field of automotive testing equipment. The leak detector includes a main metal body, a pressure regulating valve, an air hose, a digital pressure gauge, and a pressure relief valve. The digital pressure gauge features an LED digital tube, multi-color LED light strip, and a progress bar, which can calculate and display the percentage and status of cylinder pressure leakage based on pressure changes. Different color segments of the progress bar correspond to different leakage ratio ranges. The pressure regulating valve has an adjustment range of 0-150 PSI, and the pressure relief valve is preset to open at 120 PSI. The air hose connects to an extension tube and a testing connector via a quick connector, and is equipped with a detachable adapter to adapt to different spark plug hole sizes. The connecting components are fitted with O-ring seals on the external threads to ensure a seal, and the outer surface of the main metal body has an anti-slip structure. Compared with existing technologies, it has advantages such as intuitive display, strong adaptability, comprehensive safety protection, and convenient operation, effectively improving the efficiency and accuracy of cylinder testing.

Description

Technical Field

[0001] This utility model relates to the field of automotive testing equipment technology, and in particular to a digital cylinder leak detector with integrated intelligent diagnostic function. Background Technology

[0002] Currently, cylinder leak detectors on the market generally suffer from low levels of intelligence, cumbersome operation, and poor expandability. Traditional equipment mostly relies on a single pressure gauge for monitoring, requiring maintenance personnel to manually time and calculate the pressure decay rate. This necessitates simultaneous operation of a stopwatch and observation of the pressure gauge, leading to reaction delays and inaccurate timing. Leakage rates also require manual calculation, and the fault level cannot be directly displayed, increasing the risk of misjudgment.

[0003] A cylinder leak detector disclosed in Chinese patent application CN207850629U determines the leakage rate by setting a first pressure gauge and a second pressure gauge and comparing the pressure difference between the two with a table. However, it still has significant limitations. It requires manual reading of the pressure difference and calculation of the leakage rate, which is cumbersome and time-consuming. It relies on the operator's subjective judgment, which can easily lead to inaccurate test results due to reading errors. The display method is limited and cannot intuitively reflect the leakage level. It lacks adaptability and cannot cope with different specifications of engine spark plug holes. It lacks an automatic pressure relief protection mechanism, which poses a safety hazard. Therefore, there is an urgent need for a cylinder leak detector that can automatically calculate the leakage rate, display it intuitively, has strong adaptability, and has safety protection functions. Utility Model Content

[0004] This utility model overcomes the shortcomings of the above-mentioned technology and adopts the following technical solution:

[0005] A digital cylinder leak detector, comprising:

[0006] The main metal part 1 has an internal air passage, with an air inlet at one end and an air outlet at the other end.

[0007] Pressure regulating valve 2, connected to the air inlet, is used to regulate the gas pressure entering the air passage;

[0008] Air pipe 3, connected to the air outlet, is used to transmit the gas in the air passage to the cylinder to be tested;

[0009] A digital pressure gauge 4 is connected to the side of the metal part 1 near the air inlet, and its air inlet is connected to the air passage. The digital pressure gauge 4 includes a processing module for calculating and displaying the cylinder pressure leakage percentage and leakage status based on pressure changes.

[0010] The pressure relief valve 5 is connected to the side of the metal part 1 near the air outlet and its air inlet is connected to the air passage. It is used to automatically open and relieve pressure when the pressure in the air passage exceeds a preset safety value.

[0011] Furthermore, the digital pressure gauge 4 is equipped with an LED digital tube 41, a multi-color LED light strip 42, and a progress bar 43; the LED digital tube 41 is used to display the real-time pressure of the cylinder; the multi-color LED light strip 42 is used to indicate the cylinder leakage status by color; and the progress bar 43 is used to indicate the cylinder pressure leakage percentage range by length ratio.

[0012] Furthermore, the progress bar 43 includes multiple segments 43a of different lengths, each segment 43a having a different color to correspond to different cylinder pressure leakage percentage ranges. Specifically, when the progress bar displays a dark green segment, the corresponding cylinder pressure leakage percentage is 0%-5%, indicating that the engine is in good condition; when it displays a light green segment, the corresponding leakage percentage is 6%-14%, the engine is in good condition but needs to be adjusted as planned; when it displays a yellow segment, the corresponding leakage percentage is 15%-22%, the engine is in poor condition but can still run; when it displays a red segment, the corresponding leakage percentage is 23% or higher, the engine is in very poor condition and maintenance should be considered.

[0013] Furthermore, the pressure regulating valve 2 is equipped with a knob 21 for adjusting the intake air pressure by rotation, with an adjustment range of 0-150 PSI.

[0014] Furthermore, the opening pressure of the pressure relief valve 5 is preset to 120 PSI.

[0015] Furthermore, the end of the air tube 3 away from the air outlet is connected to an extended connecting air tube 6 via a quick connector 7, and the other end of the extended connecting air tube 6 is provided with a detection connector 8.

[0016] Furthermore, it also includes multiple adapters 9, which are detachably connected to the test connector 8 for adapting to spark plug holes of different sizes.

[0017] Furthermore, the connecting assembly for connecting to the spark plug hole is provided with an external thread, and the external thread is fitted with an O-ring seal 10; the connecting assembly includes the detection connector 8 or the conversion connector 9.

[0018] Furthermore, the outer surface of the main metal part 1 is provided with a raised anti-slip structure 11 for convenient handheld operation.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. Intuitive display function: Real-time pressure is displayed through LED digital tubes, and multi-color LED light strips and progress bars intuitively indicate the leakage status and leakage percentage range with color and length ratio, enabling maintenance personnel to quickly and accurately judge the cylinder sealing performance and engine status, improving detection efficiency.

[0021] 2. Good adaptability: It is equipped with multiple adapters to adapt to different spark plug hole specifications, which expands the applicability of the equipment and meets the testing needs of different engine models.

[0022] 3. Safety protection mechanism: The pressure relief valve automatically opens to relieve pressure when the pressure in the air passage exceeds 120 PSI, effectively preventing equipment damage due to overpressure and ensuring safe use.

[0023] 4. Ease of operation: The raised anti-slip structure on the outer surface of the metal parts makes it easy to operate by hand, improving the stability and comfort during the testing process.

[0024] 5. Sealing reliability: The O-ring seal on the external thread of the connecting component enhances the sealing performance with the spark plug hole, reduces gas leakage, and ensures the accuracy of test results. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the digital display cylinder leak detector of this utility model;

[0026] Figure 2 This is a front view of the utility model digital pressure gauge;

[0027] Figure 3 This is a cross-sectional view of the gas passage, digital pressure gauge, and pressure relief valve of this utility model. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0029] like Figures 1-3 As shown, the digital cylinder leak detector of this utility model mainly consists of a main body metal part 1, a pressure regulating valve 2, an air pipe 3, a digital pressure gauge 4, and a pressure relief valve 5. The main body metal part 1 is made of metal and has an internal air passage with an air inlet at one end and an air outlet at the other end, providing a channel for gas transmission.

[0030] The pressure regulating valve 2 is connected to the air inlet of the metal part 1 of the main body, and it is equipped with a knob 21. For example... Figure 1 As shown, the operator can adjust the gas pressure entering the gas passage by rotating knob 21. The adjustment range is 0-150 PSI, which can accurately control the inlet gas pressure according to different detection requirements.

[0031] The air tube 3 is connected to the air outlet of the metal part 1 of the main body, and is used to transmit the gas in the air passage to the cylinder to be tested. The end of the air tube 3 away from the air outlet is connected to the extension air tube 6 via a quick connector 7, and the other end of the extension air tube 6 is provided with a test connector 8. The quick connector 7 facilitates the quick connection and disconnection of the air tube, improving operational efficiency. The extension air tube 6 can extend the gas transmission distance according to the needs of the actual testing scenario, making it convenient to test cylinders in different positions.

[0032] The digital pressure gauge 4 is connected to the side of the metal part 1 near the air inlet, and its air inlet is connected to the air passage. For example... Figure 2 As shown, the digital pressure gauge 4 includes a processing module, an LED digital tube 41, a multi-color LED strip 42, and a progress bar 43. The processing module is electrically connected to the pressure sensor in the air passage, enabling it to collect pressure data in real time and calculate the cylinder pressure leakage percentage and leakage status based on pressure changes. The LED digital tube 41 clearly displays the real-time pressure value of the cylinder, the multi-color LED strip 42 visually indicates the cylinder leakage status using different colors, and the progress bar 43 indicates the cylinder pressure leakage percentage range through its length ratio. Specifically, the progress bar 43 includes multiple segments 43a of different lengths, each segment 43a having a different color, corresponding to different cylinder pressure leakage percentage ranges: dark green segment corresponds to 0%-5%, light green segment to 6%-14%, yellow segment to 15%-22%, and red segment to 23% and above. By observing the LED digital tube 41, multi-color LED strip 42, and progress bar 43, maintenance personnel can quickly and intuitively understand the cylinder pressure and leakage status.

[0033] The pressure relief valve 5 is connected to the side of the metal part 1 near the air outlet, and its air inlet is connected to the air passage. The opening pressure is preset to 120 PSI. When the pressure in the air passage exceeds 120 PSI, the pressure relief valve 5 automatically opens to discharge the excess gas, keeping the pressure in the air passage within a safe range and effectively protecting the equipment from high pressure damage.

[0034] like Figure 1To accommodate different spark plug hole sizes, this invention also includes multiple adapters 9. The adapters 9 are detachably connected to the test connector 8. Different adapters 9 have different specifications to match different spark plug hole models. For example, the adapters 9 include M10×1.0 (suitable for some Japanese car engines), M12×1.25 (suitable for Volkswagen / Honda engines), and US standard UNC 14×1.25 (suitable for American car engines), which can be matched to different spark plug holes via threads. The connecting assembly (test connector 8) or (adapter 9) for connecting to the spark plug hole has external threads, and an O-ring seal 10 is fitted on the external threads. When the connecting assembly is connected to the spark plug hole, the external threads engage with the internal threads of the spark plug hole, compressing the O-ring seal 10 to form a tight seal, preventing gas leakage and ensuring the accuracy of the test results.

[0035] like Figure 1 As shown, the outer surface of the main metal part 1 is provided with a raised anti-slip structure 11, which can be striped, meshed, or other suitable shapes. When the operator holds the main metal part 1, the raised anti-slip structure 11 can increase the friction between the hand and the main metal part 1, prevent the equipment from slipping, and make the operation more stable and convenient.

[0036] The working principle of this utility model is as follows: Connect the test connector 8 or, via the adapter connector 9, to the spark plug hole of the cylinder to be tested, ensuring that the O-ring seal 10 is properly sealed. Adjust the intake pressure to a suitable value, such as 80 PSI, through the pressure regulating valve 2, and turn on the air source. Gas enters the cylinder to be tested through the air passage and air pipe 3 of the metal part 1 of the main body. The processing module of the digital pressure gauge 4 collects the pressure data in the air passage in real time, calculates the cylinder pressure leakage percentage, and displays the real-time pressure through the LED digital tube 41. The multi-color LED light strip 42 and progress bar 43 indicate the leakage status and leakage percentage range. During the test, if the pressure in the air passage exceeds 120 PSI, the pressure relief valve 5 automatically opens to release pressure. After the test is completed, turn off the air source and remove the equipment.

[0037] In summary, this utility model's digital cylinder leak detector, through its reasonable structural design, achieves functions such as intuitive display, good adaptability, safety protection, and convenient operation, effectively improving the efficiency and accuracy of cylinder testing and possessing high practical value.

[0038] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A digital display cylinder leak detector, characterized in that, include: The main metal part (1) has an internal air passage, with an air inlet at one end and an air outlet at the other end; Pressure regulating valve (2), connected to the air inlet, is used to regulate the gas pressure entering the air passage; The air pipe (3) is connected to the air outlet and is used to transmit the gas in the air passage to the cylinder to be tested. A digital pressure gauge (4) is connected to the side of the metal part (1) near the air inlet, and its air inlet is connected to the air passage. The digital pressure gauge (4) includes a processing module for calculating and displaying the cylinder pressure leakage percentage and leakage status based on pressure changes. The pressure relief valve (5) is connected to the side of the metal part (1) near the air outlet and its air inlet is connected to the air passage. It is used to automatically open and relieve pressure when the pressure in the air passage exceeds a preset safety value.

2. The digital display cylinder leak detector according to claim 1, characterized in that, The digital pressure gauge (4) is equipped with an LED digital tube (41), a multi-color LED light strip (42), and a progress bar (43); the LED digital tube (41) is used to display the real-time pressure of the cylinder; the multi-color LED light strip (42) is used to indicate the cylinder leakage status by color; and the progress bar (43) is used to indicate the cylinder pressure leakage percentage range by length ratio.

3. The digital display cylinder leak detector according to claim 2, characterized in that, The progress bar (43) includes multiple segments (43a) of different lengths, each segment (43a) having a different color to correspond to different cylinder pressure leakage percentage ranges.

4. The digital display cylinder leak detector according to claim 1, characterized in that, The pressure regulating valve (2) is equipped with a knob (21) for adjusting the intake air pressure by rotating it, with an adjustment range of 0-150 PSI.

5. A digital display cylinder leak detector according to claim 1, characterized in that, The opening pressure of the pressure relief valve (5) is preset to 120 PSI.

6. A digital display cylinder leak detector according to claim 1, characterized in that, The end of the trachea (3) away from the air outlet is connected to an extended connecting trachea (6) via a quick connector (7), and the other end of the extended connecting trachea (6) is provided with a detection connector (8).

7. A digital display cylinder leak detector according to claim 6, characterized in that, It also includes multiple adapters (9) that are detachably connected to the test connector (8) for adapting to different sizes of spark plug holes.

8. A digital display cylinder leak detector according to claim 6 or 7, characterized in that, The connection assembly for connection with the spark plug hole is provided with an external thread, and the external thread is fitted with an O-ring (10); the connection assembly includes the detection connector (8) or the adapter connector (9).

9. A digital display cylinder leak detector according to claim 1, characterized in that, The outer surface of the metal body (1) is provided with a raised anti-slip structure (11) for easy hand operation.

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