Leakage diagnosis module

Abstract

The utility model relates to the technical field of automobiles, in particular to a leakage diagnosis module. The utility model provides a leakage diagnosis module which at least comprises a supporting shell, an air pump, an electromagnetic valve and an upper cover plate. A pressure cavity and an electromagnetic valve cavity which are independent of each other are arranged in the supporting shell, and the pressure cavity and the electromagnetic valve cavity are communicated through a first air channel. The air pump is mounted in the pressure cavity; the electromagnetic valve is mounted in the electromagnetic valve cavity; the upper cover plate is connected with the supporting shell in a sealed mode so as to seal the pressure cavity and the electromagnetic valve cavity. Wherein the first air passage is integrally formed with the support housing, and at least a partial section of the first air passage is closed. According to the leakage diagnosis module provided by the utility model, related communication air paths of key components such as the air pump and the electromagnetic valve are integrally formed and integrated into a single supporting shell structure, so that the use of a traditional connecting hose is greatly reduced, the reliability is improved, and the assembly process is effectively simplified.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, and more specifically, to a leak diagnosis module. Background Technology

[0002] With the continuous development of technology, various air pressure detection systems have been widely used in the automotive, aerospace, and other fields. In these applications, air pumps and solenoid valves, as important components, are often used for functions such as sealing detection and air pressure control. However, the traditional structural design of air pumps and solenoid valves usually requires multiple independent components and hose connections. This design often leads to increased system assembly complexity, an excessive number of parts, poor sealing, and even the potential for air leakage and malfunctions. In addition, traditional structures are usually large in size and expensive, making it difficult to meet the increasing product performance requirements and market demands for miniaturization, low cost, and high reliability.

[0003] Taking a fuel tank leak detection module as an example, an air pump is typically used to generate a certain pressure to detect changes in air pressure within the fuel tank system, thereby determining whether a leak exists. Traditional fuel tank leak detection systems usually connect components such as air pumps, pressure sensors, and solenoid valves via hoses and other pipelines. While this can achieve basic functions, the multiple connection points pose a potential risk of gas leakage, and the complex assembly process increases the probability of system failure.

[0004] Therefore, there is an urgent need for an integrated structure to solve the problems encountered in the assembly process of air pumps, sensors and solenoid valves in existing technologies. Utility Model Content

[0005] The purpose of this invention is to provide a leak diagnosis module that solves the problems of large size, high cost, and insufficient reliability of existing leak detection modules.

[0006] The purpose of this invention is to provide a leak diagnosis module that solves the problems of existing leak diagnosis modules, which have a large number of parts, complex assembly process, poor sealing performance, and are prone to gas leakage due to the use of discrete gas circuit connections.

[0007] To achieve the above objectives, this utility model provides a leak diagnosis module, which includes at least a support housing, an air pump, a solenoid valve, and a top cover plate:

[0008] The support housing has an independent pressure chamber and a solenoid valve chamber inside, and the pressure chamber and the solenoid valve chamber are connected through a first air passage.

[0009] The air pump is installed in the pressure chamber and is used to draw gas from the outside atmosphere and pump it into the first air passage or to draw gas from the first air passage into the outside atmosphere.

[0010] The solenoid valve is installed inside the solenoid valve chamber and is used to control the opening and closing of the air passage between the first air passage and the device to be diagnosed.

[0011] The upper cover plate is sealed to the support housing to enclose the pressure chamber and the solenoid valve chamber;

[0012] The first airway is integrally formed with the supporting shell, and at least a portion of it is closed.

[0013] In some embodiments, the support housing is further provided with a sensor cavity for mounting a pressure sensor;

[0014] The sensor cavity is connected to the first airway, so that the gas pressure in the first airway is transmitted to the pressure sensor.

[0015] In some embodiments, the pressure chamber, sensor chamber, and solenoid valve chamber are arranged side by side in sequence along the extension direction of the first air passage and are directly connected to the first air passage.

[0016] In some embodiments, the support housing is further provided with a second air passage:

[0017] The air pump has at least two air chambers inside;

[0018] The second air passage is used to connect adjacent air chambers of the air pump to form an internal series air passage for the air pump;

[0019] The second air passage is not connected to the first air passage, and the second air passage is integrally formed with the supporting shell.

[0020] In some embodiments, the first airway and / or the second airway are fitted with plugs at their open ends:

[0021] The plug is sealed to the first air passage and / or the second air passage to close the opening.

[0022] In some embodiments, the support housing is provided with a first welded skirt, and the upper cover plate is provided with a second welded skirt at a corresponding position;

[0023] The first welded skirt and the second welded skirt are connected in a sealed manner by welding, wherein the welding method is laser welding.

[0024] In some embodiments, the support housing is provided with an atmospheric interface for connecting to the outside atmosphere and a diagnostic interface for connecting to the device to be diagnosed.

[0025] The solenoid valve is in the open state, and the air passage between the external diagnostic device and the first airway is connected.

[0026] The air pump draws gas from the outside atmosphere and pumps it into the first air channel. The outside gas passes through the pressure chamber, the air pump, the first air channel, and the solenoid valve chamber in sequence from the atmosphere interface, and then through the diagnostic interface to the device to be diagnosed, forming a diagnostic circuit.

[0027] The gas flow path of the diagnostic circuit when the air pump draws gas from the first airway to the outside atmosphere is the opposite of when gas is drawn from the outside atmosphere and pumped into the first airway.

[0028] In some embodiments, the support housing further includes a reference hole and a fluid interface for the solenoid valve housing.

[0029] The reference hole is used to connect the first air passage and the solenoid valve chamber, and the fluid interface of the solenoid valve housing is connected to the atmospheric interface;

[0030] When the solenoid valve is in the closed state, the airway between the external diagnostic device and the first airway is cut off.

[0031] The air pump draws gas from the outside atmosphere and pumps it into the first air passage. The gas passes through the pressure chamber, air pump, first air passage, reference hole, and solenoid valve chamber in sequence from the atmospheric interface, and returns to the outside atmosphere through the fluid interface of the solenoid valve housing, forming a reference circuit.

[0032] The gas flow path of the reference circuit when the air pump draws gas from the first airway to the outside atmosphere is the opposite of when gas is drawn from the outside atmosphere and pumped into the first airway.

[0033] In some embodiments, the air pump is a piezoelectric ceramic pump.

[0034] This utility model provides a leak diagnosis module that integrates the relevant air passages of key components such as air pumps, pressure sensors, and solenoid valves into a single supporting housing structure. This significantly reduces the use of traditional connecting hoses and the number of potential leak points. Through the modular and integrated design of the supporting housing, the assembly process is effectively simplified, and reliability and consistency are improved. Attached Figure Description

[0035] The above and other features, properties and advantages of this utility model will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, wherein:

[0036] Figure 1 A cross-sectional view of the internal structure of a leak diagnosis module according to an embodiment of the present invention is disclosed;

[0037] Figure 2a An isometric view of a support housing according to an embodiment of the present invention is shown;

[0038] Figure 2bA top view of a support housing according to an embodiment of the present invention is shown;

[0039] Figure 3a A schematic diagram of the structure of a support housing for an adapted single-chamber air pump according to an embodiment of the present invention is shown.

[0040] Figure 3b A schematic diagram of the structure of a support housing for an adapted dual-chamber air pump according to an embodiment of the present invention is shown.

[0041] Figure 4a A schematic diagram of the air path of the support housing for an adapted single-chamber air pump according to an embodiment of the present invention is disclosed;

[0042] Figure 4b A schematic diagram of the installation of a plug according to an embodiment of the present invention is shown;

[0043] Figure 5a A schematic diagram showing the connection method of existing piezoelectric ceramic tubes is disclosed;

[0044] Figure 5b A schematic diagram of the air path of a support housing for an adapted dual-chamber air pump according to an embodiment of the present invention is shown.

[0045] The meanings of the labels in the figures are as follows:

[0046] 10. Support shell;

[0047] 11 pressure chambers;

[0048] 111 Air pump housing fluid interface;

[0049] 112 Pump Air Channel;

[0050] 113 First connecting hole;

[0051] 114 Second connecting hole;

[0052] 12 Solenoid valve chambers;

[0053] 121 Solenoid valve housing fluid interface;

[0054] 122 Diagnostic Interface;

[0055] 123 Solenoid valve sealing end;

[0056] 124 reference holes;

[0057] 13 sensor cavities;

[0058] 131 sensor channels;

[0059] 14. First airway;

[0060] 141 plugs;

[0061] 15. Second airway;

[0062] 20 air pumps;

[0063] 30 Solenoid valve;

[0064] 40 Top cover plate;

[0065] 51 pressure sensor;

[0066] 52 drive circuit components;

[0067] 61 Rubber hose;

[0068] 62 First imports;

[0069] 63 Second import;

[0070] 64 First Exit;

[0071] 65 Second Exit. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 utility model and are not intended to limit the utility model.

[0073] Figure 1 A cross-sectional view of the internal structure of a leak diagnosis module according to an embodiment of the present invention is disclosed, as shown below. Figure 1 As shown, the leak diagnosis module proposed in this utility model includes at least a support housing 10, an air pump 20, a solenoid valve 30, and an upper cover plate 40.

[0074] The support housing 10 has an independent pressure chamber 11 and a solenoid valve chamber 12 inside;

[0075] The support housing 10 is provided with a first air passage 14 for connecting the pressure chamber 11 and the solenoid valve chamber 12.

[0076] The air pump 20 is installed in the pressure chamber 11 and is used to draw gas from the outside atmosphere and pump it into the first air passage 14 or to draw gas from the first air passage 14 into the outside atmosphere.

[0077] The solenoid valve 30 is installed in the solenoid valve chamber 12 and is used to control the opening and closing of the air passage between the device to be diagnosed and the first air passage 14.

[0078] The upper cover plate 40 is sealed to the support housing 10 to close the pressure chamber 11 and the solenoid valve chamber 12;

[0079] The first airway 14 is integrally formed with the support housing 10, and at least a portion of it is closed.

[0080] Furthermore, the support housing 10 is also provided with a sensor cavity 13;

[0081] The sensor cavity 13 is used to install the pressure sensor 51.

[0082] The sensor cavity 13 is connected to the pressure cavity 11 through the first air passage 14, so that the gas pressure in the first air passage 14 is transmitted to the pressure sensor 51.

[0083] Furthermore, the pressure sensor 51 is integrated on the air pump 20 and is used to collect pressure signals within the sensor cavity 13.

[0084] Figure 2a An axonometric view of a support housing according to an embodiment of the present invention is disclosed. Figure 2b A top view of a support housing according to an embodiment of the present invention is shown, as follows. Figure 2a and Figure 2b As shown, the support housing 10 is provided with an air pump housing fluid interface 111, which is connected to the atmospheric interface.

[0085] More specifically, the air pump housing fluid interface 111 is located on the side wall of the pressure chamber 11 and is connected to the air inlet of the air pump 20 and the atmospheric interface.

[0086] The support housing 10 is provided with a solenoid valve housing fluid interface 121, which is arranged on the side wall of the solenoid valve cavity 12 and corresponds to the air passage of the solenoid valve 30, and is connected to the atmospheric interface, thereby realizing communication with the outside atmosphere.

[0087] In this embodiment, the air pump housing fluid interface 111 and the solenoid valve housing fluid interface 121 are integrated into a common atmospheric interface through an integrated channel, communicating with the outside atmosphere. The air pump housing fluid interface 111 and the solenoid valve housing fluid interface 121 are located on the same side of the support housing 10.

[0088] The support housing 10 is provided with a diagnostic interface 122, which is located at the end of the solenoid valve chamber 12 and is used to connect to the device to be diagnosed.

[0089] Figure 3a and Figure 3b Schematic diagrams of the support housings for a single-chamber air pump and a dual-chamber air pump according to an embodiment of the present invention are shown respectively. Figure 3a and Figure 3b As shown, the support housing 10 has a pumping air channel 112 on the pressure chamber side:

[0090] The air pump channel 112 connects the air outlet of the air pump 20 with the first air channel 14, and the air inlet of the air pump 20 is connected to the outside atmosphere.

[0091] The supporting housing 10 has a solenoid valve sealing end 123 on the solenoid valve cavity side:

[0092] The sealing end 123 of the solenoid valve is used to connect the first air passage 14 and the solenoid valve chamber 12.

[0093] like Figure 1 As shown, the solenoid valve 30 controls the opening of the solenoid valve sealing end 123, so that the air passage between the diagnostic interface 122 and the first air passage 14 is connected to form a diagnostic circuit.

[0094] More specifically, the solenoid valve 30 is in the open state, and the air passage between the external diagnostic device and the first air passage 14 is connected;

[0095] The air pump 20 draws gas from the outside atmosphere and pumps it into the first air passage 14. The outside gas passes through the pressure chamber 11, the air pump 20, the first air passage 14, and the solenoid valve chamber 12 in sequence from the atmosphere interface, and then through the diagnostic interface 122 to the device to be diagnosed, forming a diagnostic circuit.

[0096] When the air pump 20 draws gas from the first airway 14 to the outside atmosphere, the gas flow path of the diagnostic circuit is the opposite of when gas is drawn from the outside atmosphere and pumped into the first airway 14.

[0097] like Figure 3a and Figure 3b As shown, the support housing 10 is also provided with a sensor channel 131;

[0098] The sensor channel 131 is used to directly connect the first air passage 14 and the sensor cavity 13, so that the gas pressure in the first air passage 14 is transmitted to the pressure sensor 51.

[0099] The first air passage 14 is connected to the pump air passage 112, the sensor passage 131 and the solenoid valve sealing end 123.

[0100] In this embodiment, by integrating the sensor mounting structure into the support housing, real-time monitoring of the cavity pressure can be achieved without external components. The air pump outlet is connected to the sensor channel 131 through the first air passage 14, enabling the pressure sensor to accurately sense the pressure of the gas output by the air pump, thereby providing reliable pressure feedback data.

[0101] like Figures 1-3b As shown, the support housing 10 has a reference hole 124 on one side of the solenoid valve cavity 12:

[0102] The reference hole 124 is disposed between the solenoid valve chamber 12 and the first air passage 14, and is used to connect the solenoid valve chamber 12 and the first air passage 14. Its function is to establish a reference circuit connecting the pressure chamber 11, the first air passage 14 and the solenoid valve chamber 12 during the reference phase of module operation.

[0103] During the reference phase of module operation, the solenoid valve 30 controls the solenoid valve sealing end 123 to close, so that the solenoid valve cavity 12 is connected to the first air passage 14 through the reference hole 124, and at the same time the solenoid valve cavity 12 is connected to the outside atmosphere, forming a reference circuit.

[0104] More specifically, the solenoid valve 30 is in the closed state, cutting off the air passage between the external diagnostic device and the first airway 14;

[0105] The air pump 2 draws gas from the outside atmosphere and pumps it into the first air passage 14. The gas passes through the pressure chamber 11, the air pump 20, the first air passage 14, the reference hole 124, and the solenoid valve chamber 12 in sequence from the atmospheric interface, and returns to the outside atmosphere through the fluid interface 121 of the solenoid valve housing, forming a reference circuit.

[0106] The gas flow path of the reference circuit when the air pump 20 draws gas from the first air passage 14 to the outside atmosphere is the opposite of when it draws gas from the outside atmosphere and pumps it into the first air passage 14.

[0107] Figure 4a A schematic diagram of the air path of the support housing for an adapted single-chamber air pump according to an embodiment of the present invention is shown, as follows: Figure 4a As shown, the pump air passage 112, sensor passage 131 and solenoid valve sealing end 123 are arranged side by side along the extension direction of the first air passage 14.

[0108] Accordingly, the pressure chamber 11, the sensor chamber 13 and the solenoid valve chamber 12 are arranged side by side along the extension direction of the first air passage 14 and are directly connected to the first air passage 14.

[0109] More specifically, the pressure chamber 11, sensor chamber 13 and solenoid valve chamber 12 are arranged side by side and separated from each other by partitions inside the housing to achieve structural independence. They are connected by the first air passage 14 at the top, thus constructing a complete air passage network to ensure the orderly flow of air and functional switching within the system.

[0110] All of the above structures are integrated into the support shell 10 using an integrated molding process. This integrated design not only ensures the real-time pressure transmission, but also achieves the optimized design of the gas flow path through the series layout between the chambers.

[0111] It should be noted that the first air passage 14 is formed directly inside the support housing 10 using an integral forming process. Its passage direction and opening end are both located on the side wall of the support housing 10, and are completely independent of the upper cover plate 40, and do not depend on the joint surface between the support housing 10 and the upper cover plate 40.

[0112] In terms of structural connection, each air passage interface of the air pump corresponds one-to-one with the corresponding air passage interface on the support housing, ensuring unobstructed airflow. It can be flexibly adapted to single-chamber or dual-chamber air pump structures to meet the needs of different application scenarios.

[0113] When the air pump is a single-chamber air pump, the air outlet of the single-chamber air pump is connected to the air pump channel 112; the air inlet of the single-chamber air pump is connected to the fluid interface 111 of the air pump housing, forming a complete air circuit structure.

[0114] It should be noted that if the air pump is a multi-chamber air pump, that is, with at least two air chambers, the air pump channel 12 inside the support housing will be structurally adjusted accordingly. By integrating a series air circuit inside the support housing to replace the traditional hose connection method, the overall air tightness of the system is effectively improved, meeting the stringent requirements of the oil tank leakage diagnosis module for high precision and high stability.

[0115] In this embodiment, the multi-chamber air pump is a dual-chamber piezoelectric ceramic air pump with two air chambers.

[0116] Figure 5a A schematic diagram illustrating the piping connection method of a prior art dual-chamber air pump is shown, such as... Figure 5a As shown, the dual-chamber air pump has an external air inlet, an external air outlet, an internal air inlet, and an internal air outlet:

[0117] The first inlet 62 of the dual-chamber air pump is an external air inlet, the second inlet 63 is an internal air inlet, the first outlet 64 is an internal air outlet, and the second outlet 65 is an external air outlet.

[0118] The external air inlet and external air outlet are directly connected to the atmosphere, while the internal air inlet and internal air outlet are connected to realize the series connection of two single-chamber air pumps.

[0119] like Figure 5a As shown, in the prior art dual-chamber air pump, the second inlet 63 and the first outlet 64 are connected by a rubber hose 61 to realize the series operation of two single-chamber air pumps.

[0120] In this embodiment, the support housing 10 is further provided with a second air passage 15:

[0121] The air pump 20 has at least two air chambers;

[0122] The second air passage 15 is used to connect adjacent air chambers of the air pump to form an internal series air passage of the air pump;

[0123] The second air passage 15 is not connected to the first air passage 14, and the second air passage 15 is integrally formed with the support shell 10.

[0124] Figure 5b A schematic diagram of the air path of the support housing for an adapted dual-chamber air pump according to an embodiment of the present invention is shown, as follows: Figure 3b and Figure 5b As shown, the side wall of the pump air channel 12 is provided with two connection holes for connecting the upper and lower air chambers of the air pump in series.

[0125] In this embodiment, the connecting holes are a first connecting hole 113 and a second connecting hole 14.

[0126] The first connecting hole 113 and the second connecting hole 14 connect the internal air outlet and the internal air inlet of the dual-chamber piezoelectric ceramic air pump. The second air passage 15 connects the first connecting hole 113 and the second connecting hole 14, forming a series channel for the internal air path, so that the upper and lower air chambers of the piezoelectric ceramic air pump form a series working mode, thereby enhancing the output capacity of the air pump and the adaptability of the system.

[0127] This structure does not rely on traditional rubber hoses; it achieves direct connection between the two air pump chambers through the air passage design of the supporting shell itself.

[0128] This integrated series gas path design has many advantages:

[0129] On the one hand, it eliminates the need for rubber hoses and their installation process, reduces the number of parts, and simplifies the assembly process;

[0130] On the other hand, it improves sealing and structural stability, thereby significantly enhancing reliability.

[0131] In this embodiment, the main function of the support housing is not only to fix and support key components such as air pumps, pressure sensors and solenoid valves, but also to provide the necessary air path connections and sealing environment for each component through a reasonable internal cavity and channel design.

[0132] To achieve a compact structure and ease of assembly, the support shell adopts an integrated injection molding process, integrating all gas channels during the shell molding stage, eliminating the need for subsequent addition of external hoses or connecting fittings.

[0133] When only a single-chamber air pump is configured, the two connecting holes on the pump air passage side and the second air passage can be omitted, such as... Figure 3a As shown. This flexible configuration allows the support shell to be customized according to actual application needs, thereby simplifying the structure and reducing costs while maintaining versatility.

[0134] like Figure 4b and Figure 5b As shown in this embodiment of the present invention, a plug 141 is installed at the opening end of the first airway 14:

[0135] The plug 141 is sealed to the first air passage 14 to close the opening.

[0136] Because the air passage supporting the housing is made using an integrated injection molding process, an embedded air passage channel is directly formed during the injection molding process. This may leave some open air passage ports on the surface of the housing, but these ports will be sealed with plugs.

[0137] To ensure sealing performance and structural strength, the plug 14 and the support housing 10 are sealed and fixed using ultrasonic welding, which not only effectively improves sealing performance and prevents gas leakage, but also enhances the overall structural strength.

[0138] Similarly, the second airway 15 is fitted with a plug 141 at its open end:

[0139] The plug 141 is sealed to the second air passage 15 to close the opening.

[0140] To ensure the airtightness of the air circuit system, sealing rings are installed at all key air circuit connection points of the support housing.

[0141] Furthermore, the air pump's air path mounting part is equipped with a sealing ring to achieve air path sealing, and the solenoid valve's mounting part is equipped with a sealing ring to achieve air path sealing.

[0142] Specifically, the air pump's mounting interface and the air pump channel, the solenoid valve and the solenoid valve sealing end, and the pressure sensor and the sensor channel are all connected by sealing rings.

[0143] These sealing rings effectively prevent gas leakage during assembly, improve the airtightness of the system, and thus ensure the accuracy of pressure measurement and the overall reliability of the system operation.

[0144] Furthermore, the supporting housing 10 is provided with a first welded skirt, and the upper cover plate 40 is provided with a second welded skirt at a corresponding position;

[0145] The first welded skirt and the second welded skirt are connected in a sealed manner by welding, wherein the welding method is laser welding.

[0146] Laser welding, as a high-precision, low-heat-input welding method, can not only effectively avoid deformation caused by thermal stress, but also significantly improve the sealing and structural strength of the connection parts, which helps to improve the airtightness, vibration resistance and long-term reliability of the entire diagnostic module in complex environments.

[0147] In a preferred embodiment, the leakage diagnosis module further includes a drive circuit component 52:

[0148] The drive circuit assembly 52 is installed in the same cavity as the air pump 20, that is, in the pressure chamber 11 inside the support housing 10, located between the air pump 20 and the upper cover plate 40, and is used to drive the air pump 20 to work.

[0149] The oil tank leakage diagnosis module proposed in this utility model is mainly divided into two working stages: the first stage is the reference stage, and the second stage is the diagnosis stage.

[0150] The reference phase is used to verify the stability of the air pump of the leak diagnosis module itself, providing a reliable benchmark for the subsequent diagnosis phase. The diagnosis phase is used to test the oil and gas leaks of the equipment to be diagnosed in the whole vehicle.

[0151] When the leakage diagnosis module is in the reference phase:

[0152] When the solenoid valve 30 is in the closed state, it cuts off the air path between the external device to be diagnosed and the first air passage 14, thereby isolating the connection between the leak diagnosis module and the external device to be diagnosed.

[0153] The air passage between the fluid interface 121 of the solenoid valve housing and the solenoid valve chamber 11 is in a connected state;

[0154] The air pump 20 draws gas from the outside atmosphere and pumps it into the first air passage 14 or draws the gas in the first air passage 14 into the outside atmosphere, performing pressurization pumping or depressurization pumping operations on the reference circuit formed inside the leak diagnosis module.

[0155] Pressure sensor 51 continuously collects air pressure data to assess the performance of the leak diagnosis module itself.

[0156] During pressurization and pumping, the reference circuit involves external gas passing sequentially through the pump housing fluid interface 111 and pressure chamber 11 into the pump 20. After compression by the pump 20, the gas passes through pressure chamber 11, first air passage 14, reference hole 124, and solenoid valve chamber 12, before returning to the outside atmosphere via the solenoid valve housing fluid interface 121. During depressurization and evacuation, the reference circuit gas path is reversed.

[0157] When the leakage diagnosis module is in the diagnosis phase:

[0158] When the solenoid valve 30 is in the open state, the diagnostic interface 122 of the support housing 10 is connected, and the external device to be diagnosed is connected to the airway of the first airway 14.

[0159] The fluid interface 522 on the air pump housing is in a closed state;

[0160] The air pump 20 draws gas from the outside atmosphere and pumps it into the first air passage 14 or draws the gas in the first air passage 14 into the outside atmosphere, establishing a diagnostic circuit from the inside of the leak diagnosis module to the device to be diagnosed.

[0161] Air pressure data is collected by pressure sensor 51 or the pressure sensor in the device under test to obtain air pressure monitoring results, so as to evaluate the oil-gas sealing performance of the device under test.

[0162] During pressurization, the diagnostic circuit allows external gas to sequentially pass through the pump housing fluid interface 111 and pressure chamber 11 before entering the pump 20. After compression by the pump 20, the gas passes through the first air passage 14, reference hole 124, solenoid valve sealing end 123, and solenoid valve chamber 12, and is then delivered to the device under test via the diagnostic interface 122. During depressurization and evacuation, the diagnostic circuit's gas path is reversed.

[0163] Compared with existing technologies, the leak diagnosis module proposed in this invention significantly reduces the use of traditional connecting hoses and substantially lowers the number of potential leak points by integrating air pumps, pressure sensors, solenoid valves, and other related air circuits into a single supporting housing structure. Simultaneously, the modularity and integration of the overall supporting housing structure effectively simplifies the assembly process, improves production efficiency, and enhances product consistency.

[0164] The fuel tank leak diagnosis module proposed in this invention is applicable to various application systems with high requirements for air circuit integration and sealing, and has significant advantages, especially in precision air circuit control scenarios such as automotive fuel tank leak detection. While the fuel tank system is a typical example of the device to be diagnosed, the application scope of this leak diagnosis module is not limited to fuel tank systems. In fact, this leak diagnosis module is also applicable to other closed or semi-closed systems that require airtightness testing, including but not limited to pipelines and carbon canisters in fuel supply systems, refrigerant pipelines and evaporators in refrigeration systems, brake pipelines and cylinders in hydraulic or pneumatic systems, as well as various sealed containers and fluid transport systems.

[0165] The leakage diagnosis module proposed in this utility model has the following beneficial effects:

[0166] 1) By integrally molding the pump air channel, sensor channel, solenoid valve sealing end, first air path, and second air path inside the support housing, the traditional hose connection method is eliminated, which significantly simplifies the overall structure and improves assembly efficiency.

[0167] 2) The air passage design of the supporting shell can be flexibly adapted to single-chamber or multi-chamber piezoelectric ceramic air pumps to meet the functional requirements of different application scenarios, adapt to various air pump configurations, and has strong compatibility.

[0168] 3) The support housing is manufactured using an integrated molding process. Combined with the design of sealing rings and plugs, key interfaces are sealed to effectively prevent gas leakage, improve the system's sealing performance, and ensure the stability and accuracy of measurement results.

[0169] While the foregoing disclosure has discussed various examples of utility model embodiments that are currently considered useful, it should be understood that the designations corresponding to the components shown in the "Claims" and "Utility Model Contents" columns are assigned to the components shown in the embodiments for ease of understanding of the scope of the claims. However, the components shown in the claims are not intended to be specific to the components of the embodiments. In particular, the dimensions, materials, shapes, and relative arrangements of the constituent components described in the embodiments, unless specifically stated otherwise, are not intended to limit the scope of the present utility model, but are merely illustrative examples.

[0170] However, the dimensions or positional relationships of the components shown in the accompanying drawings are sometimes exaggerated for clarity. Therefore, in the following description, detailed descriptions of the same names and symbols representing the same or homogeneous components are appropriately omitted. Furthermore, the elements constituting this utility model can be multiple elements composed of the same components, thus allowing one component to function as multiple elements; conversely, multiple components can share the function of one component. Additionally, the content described in some embodiments and implementations can be applied to other embodiments and implementations. Furthermore, in this specification, "upper" is not limited to the case of being formed in contact with an upper surface, but also includes the case of being formed separately on top, and may also include the meaning of an interlayer between layers.

[0171] Similarly, it should be noted that, in order to simplify the description of this utility model and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of this utility model sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the object of this utility model requires more features than those mentioned in the claims. In fact, the embodiments have fewer features than all the features of the single embodiment disclosed above.

[0172] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0173] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0174] Although the present invention has been described with reference to specific embodiments, those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention, and various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, any changes or modifications to the above embodiments within the scope of the essential spirit of the present invention will fall within the scope of the claims of this application.

Claims

1. A leak diagnosis module, characterized in that, It includes at least a support housing (10), an air pump (20), a solenoid valve (30), and a top cover plate (40): The support housing (10) has an independent pressure chamber (11) and a solenoid valve chamber (12) inside, and the pressure chamber (11) and the solenoid valve chamber (12) are connected through a first air passage (14); The air pump (20) is installed in the pressure chamber (11) and is used to draw gas from the outside atmosphere and pump it into the first air passage (14) or to draw gas from the first air passage (14) into the outside atmosphere. The solenoid valve (30) is installed in the solenoid valve chamber (12) and is used to control the opening and closing of the air passage between the first air passage (14) and the device to be diagnosed. The upper cover plate (40) is sealed to the support housing (10) to close the pressure chamber (11) and the solenoid valve chamber (12); The first airway (14) is integrally formed with the support shell (10), and at least a portion of it is closed.

2. The leakage diagnosis module according to claim 1, characterized in that: The support housing (10) is also provided with a sensor cavity (13) for mounting a pressure sensor (51); The sensor cavity (13) is connected to the first airway (14), so that the gas pressure in the first airway (14) is transmitted to the pressure sensor (51).

3. The leakage diagnosis module according to claim 2, characterized in that: The pressure chamber (11), sensor chamber (13) and solenoid valve chamber (12) are arranged side by side along the extension direction of the first air passage (14) and are directly connected to the first air passage (14).

4. The leak diagnosis module according to claim 1, characterized in that, The supporting shell (10) is also provided with a second air passage (15): The air pump (20) has at least two air chambers inside; The second air passage (15) is used to connect the adjacent air chambers of the air pump (20) to form an internal series air passage of the air pump (20); The second air passage (15) is not connected to the first air passage (14), and the second air passage (15) is integrally formed with the support shell (10).

5. The leakage diagnosis module according to claim 4, characterized in that: The first airway (14) and / or the second airway (15) are fitted with plugs (141) at their opening ends: The plug (141) is sealed to the first air passage (14) and / or the second air passage (15) to close the opening.

6. The leakage diagnosis module according to claim 1, characterized in that: The supporting shell (10) is provided with a first welding skirt, and the upper cover plate (40) is provided with a second welding skirt at the corresponding position; The first welded skirt and the second welded skirt are connected in a sealed manner by welding, wherein the welding method is laser welding.

7. The leak diagnosis module according to claim 1, characterized in that, The support housing is provided with an atmospheric interface for connecting to the outside atmosphere and a diagnostic interface (122) for connecting to the device to be diagnosed: The solenoid valve (30) is in the open state, and the air passage between the external diagnostic device and the first airway (14) is connected; The air pump (20) draws gas from the outside atmosphere and pumps it into the first air passage (14). The outside gas passes through the pressure chamber (11), air pump (20), first air passage (14), and solenoid valve chamber (12) in sequence from the atmospheric interface, and then through the diagnostic interface (122) to the device to be diagnosed, forming a diagnostic circuit. The gas flow path of the diagnostic circuit when the air pump (20) draws gas from the first air passage (14) to the outside atmosphere is the opposite of when gas is drawn from the outside atmosphere and pumped into the first air passage (14).

8. The leak diagnosis module according to claim 7, characterized in that, The support housing (10) is also provided with a reference hole (124) and a fluid interface (121) for the solenoid valve housing: The reference hole (124) is used to connect the first air passage (14) and the solenoid valve chamber (12), and the fluid interface (121) of the solenoid valve housing is connected to the atmospheric interface; The solenoid valve (30) is in the closed state, and the air passage between the external diagnostic device and the first airway (14) is cut off; The air pump (20) draws gas from the outside atmosphere and pumps it into the first air passage (14). The gas passes through the pressure chamber (11), air pump (20), first air passage (14), reference hole (124), and solenoid valve chamber (12) in sequence from the atmospheric interface, and returns to the outside atmosphere through the fluid interface (121) of the solenoid valve housing, forming a reference circuit. The gas flow path of the reference circuit when the air pump (20) draws gas from the first air passage (14) to the outside atmosphere is the opposite of when it draws gas from the outside atmosphere and pumps it into the first air passage (14).

9. The leak diagnosis module according to any one of claims 1 to 8, characterized in that, The air pump (20) is a piezoelectric ceramic pump.

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