Leakage testing machine for cylinder cover plunger

Abstract

The utility model relates to the technical field of inspection equipment, and provides a cylinder cover plunger leakage testing machine, which comprises a base, a detection table for placing a cylinder cover assembly is arranged on the base, a plunger is arranged in the cylinder cover assembly in a sliding manner, and the cylinder cover assembly is provided with an unloading port; the sealing pressure inflation head moves relative to the detection table and can seal the unloading opening and introduce high-pressure gas into the cylinder cover assembly; the displacement detection sensor is located below the detection table, a detection head of the displacement detection sensor faces the plunger, and the displacement detection sensor is used for detecting the displacement of the plunger after the cylinder cover assembly is inflated. According to the leakage testing machine, through combination of sealing inflation and displacement detection, accurate detection of the sealing performance of the cylinder cover plunger is realized, the structural design is reasonable, the detection efficiency is high, and an effective means is provided for quality control of the cylinder cover plunger. According to the technical scheme, the technical problem that the sealing performance, the displacement and the unloading pressure of the cylinder cover plunger cannot be tested independently in the whole machine detection of an existing compressor is solved.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of testing equipment technology, specifically to a cylinder head plunger leak tester. Background Technology

[0002] In modern compressor manufacturing, airtightness is one of the core indicators for measuring product quality and reliability. Currently, the industry commonly uses whole-unit compressor airtightness testing technology. This involves filling the assembled compressor with high-pressure gas and using pressure sensors or gas leak detectors to monitor leakage and determine its sealing performance. While this method can quickly assess the overall sealing status, it has significant limitations: because the testing object is an integrated compressor system, it cannot perform individual testing on critical components (such as cylinder head plungers). As the core moving component of the compressor, the cylinder head plunger's sealing directly affects compression efficiency and energy consumption, while its displacement reflects the wear and operational stability of the component; both play a decisive role in the compressor's performance and lifespan. However, the whole-unit testing mode cannot accurately identify individual defects in the cylinder head plunger, causing minor leaks or displacement deviations to be masked by overall system parameters, making it difficult to pinpoint the root cause of the fault. Furthermore, because targeted testing of the cylinder head plunger is impossible, manufacturers must invest significant time and resources in disassembling and inspecting the entire unit, severely restricting product quality control efficiency and production cycle. Therefore, developing a technology that can overcome the limitations of whole-machine testing and achieve independent testing of cylinder head plunger sealing performance and displacement has become a key issue that urgently needs to be addressed in the current compressor manufacturing field. Utility Model Content

[0003] To overcome the above-mentioned defects, embodiments of this utility model provide a cylinder head plunger leak tester, which solves the technical problem that existing compressor whole-machine testing cannot separately test the sealing performance, displacement, and unloading pressure of the cylinder head plunger.

[0004] According to one aspect, at least one embodiment of the present invention provides a cylinder head plunger leak testing machine, comprising:

[0005] A base, on which a testing platform is provided, the testing platform being used to place a cylinder head assembly, a plunger being slidably provided inside the cylinder head assembly, and a load relief port being provided on the cylinder head assembly;

[0006] A sealing pressure inflation head is movable relative to the test bench. The sealing pressure inflation head can seal the unloading port and introduce high-pressure gas into the cylinder head assembly.

[0007] A displacement detection sensor is disposed below the detection platform, with its detection head facing the plunger, and is used to detect the displacement of the plunger after the cylinder head assembly is filled with gas.

[0008] For example, in the cylinder head plunger leak tester provided in at least one embodiment of the present invention, the sealing pressure inflation head includes a top sealing pressure inflation head and a side sealing pressure inflation head, both of which are movable relative to the test platform. The top sealing pressure inflation head is used for cylinder head assembly testing where the unloading port is located at the top of the cylinder head assembly, and the side sealing pressure inflation head is used for cylinder head assembly testing where the unloading port is located on the side wall of the cylinder head.

[0009] For example, the cylinder head plunger leak tester provided in at least one embodiment of this utility model further includes:

[0010] A support bracket is mounted on the base, with its top end positioned above the testing platform.

[0011] Sliding block one, which is laterally slidably mounted on bracket one;

[0012] The first telescopic component is disposed on the first sliding block and moves laterally with the first sliding block, and the top sealing pressure inflation head is disposed at the telescopic end of the first telescopic component.

[0013] For example, the cylinder head plunger leak tester provided in at least one embodiment of this utility model further includes:

[0014] Support bracket two, which is elliptical and mounted on the base.

[0015] Sliding block two, which is laterally slidably disposed on bracket two;

[0016] The second telescopic component is disposed on the second sliding block and moves with the second sliding block. The lateral sealing pressure inflation head is disposed at the telescopic end of the second telescopic component.

[0017] For example, in the cylinder head plunger leak tester provided in at least one embodiment of the present invention, the bracket is provided with a slide rail extending laterally, and the sliding block slides along the slide rail.

[0018] For example, in the cylinder head plunger leak tester provided in at least one embodiment of the present invention, the bracket 2 is provided with a slide rail 2 extending laterally, and the sliding block 2 slides along the slide rail 2.

[0019] For example, in at least one embodiment of the cylinder head plunger leak tester provided by this utility model, an operating unit is also included, on which an electrical control cabinet is provided, and the electrical control cabinet is provided with a start button (102) and an emergency stop button (103).

[0020] For example, in the cylinder head plunger leak tester provided in at least one embodiment of the present invention, a gripping device is provided on the test platform. The gripping device is used to clamp the cylinder head assembly. The gripping device includes two arms that are slidably disposed on the test platform. After the two arms slide close together, they can clamp the cylinder head.

[0021] For example, in the cylinder head plunger leak tester provided in at least one embodiment of the present invention, the arm can extend and retract vertically, the upper end of the arm is provided with a stop block, the stop block is used to press the upper end of the cylinder head assembly, the lower end of the arm is provided with a sliding block three, the test table is provided with a slide rail three that slides with the sliding block three, and the arm is slidably mounted on the test table through the slide rail three and the sliding block three.

[0022] For example, in the cylinder head plunger leak tester provided in at least one embodiment of the present invention, the sealing pressure inflation head is provided with a three-way pipe. The first end of the three-way pipe is used to install a pressure detection sensor, the second end is used to connect with an external air source, and the third end is used to seal and connect with the unloading port.

[0023] The beneficial effects of the embodiments of this utility model are as follows:

[0024] In this invention, the sealing pressure inflation head is movable and seals the unloading port, allowing high-pressure gas to be introduced into the cylinder head assembly. Combined with a displacement detection sensor below the testing platform, it can detect the displacement of the plunger after inflation, thereby determining whether there is a leak in the cylinder head plunger system. The sealing pressure inflation head comes in two types: top and side, allowing for testing of cylinder head assemblies with unloading ports located on the top and side walls, respectively. This greatly expands the applicability of the equipment, meets the testing needs of cylinder heads with different structures, and improves the equipment's versatility and practicality. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0026] Figure 1 This is a schematic diagram of the cylinder head plunger leak tester in one embodiment of the present invention;

[0027] Figure 2 for Figure 1 Left view of the cylinder head plunger leak tester in the embodiment;

[0028] Figure 3 for Figure 1 Enlarged diagram of point A in the diagram;

[0029] Figure 4 This is a schematic diagram of the sealing pressure inflation head structure of the cylinder head plunger leak tester in one embodiment of the present invention.

[0030] In the diagram: 1. Base; 2. Detection platform; 21. Displacement detection sensor; 3. Sealing pressure inflation head; 300. T-pipe; 310. First end; 320. Second end; 330. Third end; 31. Top sealing pressure inflation head; 32. Side sealing pressure inflation head; 4. Bracket 1; 41. Slide rail 1; 5. Sliding block 1; 6. First telescopic component; 7. Bracket 2; 71. Slide rail 2; 8. Sliding block 2; 9. Second telescopic component; 10. Operating unit; 101. Electrical control cabinet; 102. Start button; 103. Emergency stop button; 11. Grabbing device; 111. Arm; 112. Stop; 113. Sliding block 3; 114. Slide rail 3. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0032] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0033] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] like Figures 1-4 As shown, this embodiment provides a cylinder head plunger leak tester, which is designed to test the sealing performance of the plunger in the cylinder head assembly. The leak tester is supported by a base 1, and a test platform 2 is provided on top of the base 1. The test platform 2 is used to stably place the cylinder head assembly. The plunger is slidably installed inside the cylinder head assembly, and the cylinder head assembly is provided with a load relief port.

[0038] A testing platform 2 is mounted on the base 1. The device also includes a sealing pressure testing head and a sealing pressure inflation head 3 that can approach the testing platform 2 and abut against the unloading port of the cylinder head assembly. After a seal is formed, high-pressure gas can be introduced into the cylinder head assembly. Below the testing platform 2, a displacement detection sensor 21 is installed, with its detection head facing the plunger inside the cylinder head assembly, used to monitor the displacement of the plunger after high-pressure gas is introduced into the cylinder head assembly.

[0039] In some examples, the cylinder head plunger leak tester includes a base 1, which serves as the fundamental support component of the entire device and is located at the bottom of the device. A test platform 2 is mounted on the base 1 and serves as a platform for placing the cylinder head assembly. A plunger is slidably mounted inside the cylinder head assembly, and the cylinder head assembly has an unloading port. The test platform 2 provides a stable placement surface for subsequent testing operations. A sealing pressure inflation head 3 is movable relative to the test platform 2 and includes a top sealing pressure inflation head 31 and a side sealing pressure inflation head 32. The top sealing pressure inflation head 31 is used to detect when the unloading port is located at the top of the cylinder head assembly. It is mounted on a sliding block 5 via a first telescopic member 6. The sliding block 5 is laterally slidably mounted on a bracket 4, which is fixed to the base 1, with its top end located above the test platform 2. The side sealing pressure inflation head 32 is used to detect when the unloading port is located on the side wall of the cylinder head. It is mounted on a sliding block 8 via a second telescopic member 9. The sliding block 8 is laterally slidably mounted on a bracket 7 that is raised and lowered on the base 1. Two types of inflation heads are movable, enabling sealing and inflation operations at different unloading ports. A displacement detection sensor 21 is installed below the detection platform 2, with its detection head facing the plunger inside the cylinder head assembly. After the cylinder head assembly is inflated, this sensor can detect the plunger displacement in real time, providing data to determine whether the cylinder head plunger system is leaking.

[0040] The gripping device 11 is mounted on the testing table 2 and is used to clamp the cylinder head assembly. It includes two sliding arms 111, which slide in conjunction with the slide rails 114 on the testing table 2 via sliding blocks 113. The arms 111 can extend and retract vertically, and the upper stop block 112 can press against the upper end of the cylinder head assembly to ensure that the cylinder head assembly is stable and does not move during the testing process. The gripping device 11 can adapt to cylinder head assemblies of different sizes. In addition, the sealing pressure inflation head 3 is equipped with a three-way pipe 300. The first end 310 is used to install a pressure detection sensor, the second end 320 is connected to an external air source, and the third end 330 is sealed to the unloading port to realize the introduction of gas and pressure detection. The operating unit 10 is located in a suitable position on the device and is equipped with an electrical control cabinet 101. The electrical control cabinet 101 is equipped with a start button and an emergency stop button. The operator controls the operation and emergency stop of the entire leak testing machine through the operating unit 10.

[0041] When the sealing pressure inflation head introduces high-pressure gas into the cylinder head assembly through the unloading port, the displacement detection sensor 21 monitors the displacement of the plunger in real time. If, throughout the entire testing process, the plunger displacement remains within the preset normal displacement range, and the internal pressure of the cylinder head assembly monitored by the pressure sensor remains stable within the specified pressure range without any abnormal pressure drop, it indicates that the cylinder head plunger system is well-sealed and there is no gas leakage. In this case, the cylinder head plunger can be deemed qualified. If any of the following situations occur after high-pressure gas is introduced into the cylinder head assembly, the cylinder head plunger can be deemed unqualified: First, the displacement detection sensor 21 detects that the plunger displacement exceeds the preset normal displacement range, which means that there may be a leak in the cylinder head plunger system, causing internal pressure changes that lead to abnormal plunger displacement; Second, the pressure sensor detects that the internal pressure of the cylinder head assembly drops rapidly or cannot be maintained within the specified pressure range after inflation, indicating that there is a gas leak in the cylinder head plunger system, which cannot maintain a sealed state, and the cylinder head plunger is also deemed unqualified.

[0042] When a cylinder head plunger sealing test is required, the operator first places the cylinder head assembly on the test platform 2, then presses the start button. The two arms 111 slide along the slide rail 114 via the slider 3, approaching and abutting against both ends of the cylinder head assembly, clamping it. The arms 111 then extend and retract, causing the stop block 112 to press firmly against the cylinder head assembly, preventing it from moving horizontally. If the unloading port is located at the top of the cylinder head assembly, the slider 5 mounted on the bracket 4 is controlled to slide laterally, moving the first telescopic component 6 and the top sealing pressure inflation head 31 directly above the unloading port. If the unloading port is located on the side wall of the cylinder head, the bracket 7 is raised and lowered to a suitable height, and then the slider 8 is controlled to slide laterally, aligning the second telescopic component 9 and the side sealing pressure inflation head 32 with the unloading port. Then, the sealing pressure inflation head 3 is moved to ensure a tight seal with the unloading port. High-pressure gas is then injected into the cylinder head assembly. A pressure sensor (e.g., a diffused silicon pressure sensor) on the three-way pipe 300 can detect the pressure on the cylinder head assembly in real time. At this time, the internal pressure of the cylinder head assembly changes. If a leak exists, the plunger displacement will be abnormal. The displacement sensor 21 (e.g., a laser displacement sensor) captures the plunger displacement data in real time and transmits the data to the display screen of the operation unit 10, thereby determining whether there is a leak in the cylinder head plunger.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A cylinder head plug leak-down machine characterized by, include: A base (1) is provided on the base (1), and a test platform (2) is provided on the test platform (2) for placing the cylinder head assembly. A plunger is slidably provided inside the cylinder head assembly, and the cylinder head assembly has a load-relief port. A sealing pressure inflation head (3) is movable relative to the test bench (2). The sealing pressure inflation head (3) can seal the unloading port and introduce high pressure gas into the cylinder head assembly. Displacement detection sensor (21) is located below the detection platform (2), with the detection head of the displacement detection sensor (21) facing the plunger, and is used to detect the displacement of the plunger after the cylinder head assembly is filled.

2. The cylinder head plunger leak-down machine of claim 1, wherein, The sealing pressure inflation head (3) includes a top sealing pressure inflation head (31) and a side sealing pressure inflation head (32), both of which are movable relative to the test platform (2). The top sealing pressure inflation head (31) is used for testing cylinder head assemblies with unloading ports located at the top of the cylinder head assembly, and the side sealing pressure inflation head (32) is used for testing cylinder head assemblies with unloading ports located on the side wall of the cylinder head.

3. The cylinder head plunger leak-down machine of claim 2, wherein, Also includes: Support 1 (4), which is mounted on the base (1) and its top end is located above the detection table (2); Sliding block one (5), the sliding block one (5) is laterally slidably disposed on the bracket one (4); The first telescopic member (6) is disposed on the first sliding block (5) and moves laterally with the first sliding block (5). The top sealing pressure inflation head (31) is disposed at the telescopic end of the first telescopic member (6).

4. The cylinder head plunger leak-down machine of claim 2, wherein, Also includes: Support 2 (7), which is elliptical and mounted on the base (1), Sliding block two (8), the sliding block two (8) is laterally slidably disposed on the bracket two (7); The second telescopic member (9) is disposed on the second sliding block (8) and moves with the second sliding block (8). The lateral sealing pressure inflation head (32) is disposed at the telescopic end of the second telescopic member (9).

5. The cylinder head plunger leak-down machine of claim 3, wherein, The bracket (4) is provided with a slide rail (41) extending laterally, and the sliding block (5) slides along the slide rail (41).

6. The cylinder head plunger leak-down machine of claim 4, wherein, The bracket 2 (7) is provided with a slide rail 2 (71) extending laterally, and the sliding block 2 (8) slides along the slide rail 2 (71).

7. The cylinder head plunger leak-down machine of claim 1, wherein, It also includes an operation unit (10), on which an electrical control cabinet (101) is provided, and on which a start button (102) and an emergency stop button (103) are provided.

8. The cylinder head plunger leak-down machine of claim 1, wherein, The testing platform (2) is equipped with a gripping device (11), which is used to clamp the cylinder head assembly. The gripping device (11) includes two arms (111) that are slidably disposed on the testing platform (2). When the two arms (111) slide close together, they can clamp the cylinder head.

9. The cylinder head plunger leak-down machine of claim 8, wherein, The arm (111) can extend and retract vertically. The upper end of the arm (111) is provided with a stop block (112), which is used to press the upper end of the cylinder head assembly. The lower end of the arm (111) is provided with a sliding block three (113). The testing table (2) is provided with a slide rail three (114) that slides with the sliding block three (113). The arm (111) is slidably mounted on the testing table (2) through the slide rail three (114) and the sliding block three (113).

10. The cylinder head plunger leak-down machine of claim 1, wherein, The sealing pressure inflation head (3) is provided with a three-way pipe (300). The first end (310) of the three-way pipe (300) is used to install a pressure detection sensor, the second end (320) is used to connect with an external air source, and the third end (330) is used to seal and connect with the unloading port.

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