Integrated air pump assembly and leakage diagnosis module

Abstract

The utility model relates to the technical field of automobiles, in particular to an integrated air pump assembly and a leakage diagnosis module. The utility model provides an integrated air pump assembly which at least comprises an air pump, a pressure sensor and a first driving circuit board, the air pump is used for pumping air to equipment to be diagnosed, and the air pump is provided with an air pump shell; the pressure sensor is integrated on the air pump shell and used for collecting pressure signals. The first driving circuit board is electrically connected with the air pump and the pressure sensor and used for driving the air pump and the pressure sensor and transmitting pressure signals. According to the integrated air pump assembly provided by the utility model, the pressure sensor and the air pump are integrated, so that the assembly process is simplified, the pressure value of the module can be directly detected, and the detection precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, and in particular to an integrated air pump assembly and a leak diagnosis module. Background Technology

[0002] With the improvement of living standards, automobiles have become a common means of transportation. When a car's fuel tank leaks, the gasoline inside evaporates into the air, causing air pollution and harming the environment. Therefore, it is necessary to detect whether the fuel tank is leaking. In automotive fuel evaporation emission control systems, the fuel tank leak detection module generally uses a pressure sensor as the core detection element. However, in existing technologies, the assembly method of the pressure sensor has significant structural defects:

[0003] 1) The pressure sensor chip is housed in a separate metal or plastic casing. One end of the casing is connected to the air pump outlet, and the other end holds the sensor chip, forming a closed cavity. The sensor chip is fixed to the bottom of the casing with adhesive or sealing resin, which complicates the assembly process and increases the complexity of the packaging structure.

[0004] 2) High material costs and low space utilization;

[0005] 3) The gas flow needs to be transferred from the gas pump outlet through the enclosed shell cavity to the surface of the sensor chip, which increases the cavity volume and causes pressure response lag, making it difficult to detect small leaks in time.

[0006] Therefore, it is indeed necessary to propose a new pressure sensor integration scheme to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide an integrated air pump assembly to solve the technical problems of complex assembly, signal transmission delay, high risk of sensor failure, and high cost in existing fuel tank leak detection solutions due to independent sensor housings and sealing resins.

[0008] To achieve the above objectives, this utility model provides an integrated air pump assembly, which includes at least an air pump, a pressure sensor, and a first drive circuit board:

[0009] The air pump is used to pump or evacuate air into the device to be diagnosed, and the air pump has an air pump housing.

[0010] The pressure sensor is integrated into the air pump housing and is used to collect pressure signals;

[0011] The first drive circuit board is electrically connected to the air pump and the pressure sensor respectively, and is used to drive the air pump and the pressure sensor and transmit pressure signals.

[0012] In some embodiments, the air pump housing includes a mounting bracket for mounting the pressure sensor;

[0013] The fixed bracket is integrally formed with the air pump housing.

[0014] In some embodiments, the air pump housing is embedded with a PIN structure for connecting a pressure sensor and / or a first drive circuit board;

[0015] The PIN pin structure includes a first PIN pin structure and a second PIN pin structure:

[0016] The first end of the first PIN pin structure is connected to a pressure sensor, and the second end of the first PIN pin structure is connected to a first driving circuit board.

[0017] The first end of the second PIN structure is connected to the power supply terminal of the air pump, and the second end of the second PIN structure is connected to the first drive circuit board.

[0018] In some embodiments, the air pump housing further includes a second drive circuit board, which is fixedly mounted on the fixed bracket and electrically connected to the first PIN structure.

[0019] The pressure sensor is mounted on the second drive circuit board and is electrically connected to the first PIN structure through the second drive circuit board.

[0020] In some embodiments, the second drive circuit board is fixedly mounted on the fixed bracket by welding or press-fitting to the first end of the first PIN structure.

[0021] In some embodiments, the pressure sensor is directly fixed to the first PIN structure by welding.

[0022] In some embodiments, the air pump housing further includes a connecting base plate and an air pump unit. The connecting base plate has a first side and a second side. The fixing bracket and the air pump unit are disposed on the first side of the connecting base plate along the axial direction of the air pump, and the drive circuit assembly is disposed on the second side of the connecting base plate.

[0023] The fixed bracket, the connecting base plate, and the air pump unit are integrally formed.

[0024] In some embodiments, a first end of the first PIN structure extends from the fixing bracket, and a second end of the first PIN structure extends from a second side of the connecting base plate;

[0025] The first end of the second PIN structure extends from the air pump unit, and the second end of the first PIN structure extends from the second side of the connecting base plate.

[0026] To achieve the above objectives, this utility model also provides a leak diagnosis module, comprising at least the integrated air pump assembly and support housing as described in any of the preceding claims:

[0027] The integrated air pump assembly is installed inside the support housing;

[0028] The support housing has a pressure chamber and a sensor chamber inside;

[0029] The pressure chamber and the sensor chamber are connected through the airflow channel of the supporting housing. The pressure chamber is used to install an air pump, and the sensor chamber is used to install a sensor.

[0030] In some embodiments, the air pump housing includes a mounting bracket for mounting the pressure sensor. The mounting bracket is sealed to the support housing to form a closed sensor cavity structure.

[0031] In some embodiments, a cylindrical mounting portion is provided at the connection between the fixing bracket and the connecting base plate.

[0032] The outer circumferential surface of the mounting part is interference-fitted with the inner wall of the sensor cavity, and a sealing ring is provided between the mounting part and the inner wall of the sensor cavity.

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

[0034] This invention proposes an integrated air pump assembly that integrates a pressure sensor and an air pump into one unit. It can directly detect the module pressure value and accurately obtain the actual pressure value inside the device to be diagnosed. This effectively avoids the failure problem of pressure calculation deviation caused by factors such as current fluctuations in the prior art, thereby significantly improving the accuracy of oil tank leakage detection. Attached Figure Description

[0035] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0036] Figure 1 A cross-sectional view of a pressure sensor installation according to an embodiment of the prior art is disclosed;

[0037] Figure 2 An exploded view of the components of an integrated air pump assembly according to an embodiment of the present invention is shown.

[0038] Figure 3a A first-view structural diagram of an air pump according to an embodiment of the present invention is disclosed;

[0039] Figure 3bA second-view structural diagram of an air pump according to an embodiment of the present invention is disclosed;

[0040] Figure 4 A schematic diagram showing the connection between a pressure sensor and an air pump according to an embodiment of this utility model is disclosed;

[0041] Figure 5 A schematic diagram showing the connection between the pressure sensor and the air pump according to another embodiment of the present invention is disclosed;

[0042] Figure 6 A cross-sectional view of a leak diagnosis module according to an embodiment of the present invention is shown.

[0043] The meanings of the labels in the figures are as follows:

[0044] 101 pressure sensor chip;

[0045] 102 resin;

[0046] 103 Enclosed shell;

[0047] 200 air pump;

[0048] 211 Fixed bracket;

[0049] 212 Connecting base plate;

[0050] 213 sealing ring;

[0051] 221 First end of the first PIN structure;

[0052] 222 The second end of the first PIN structure;

[0053] 223 The first end of the second PIN structure;

[0054] The second end of the 224 second PIN pin structure;

[0055] 300 pressure sensor;

[0056] 301 Second Drive Circuit Board;

[0057] 400 First Drive Circuit Board;

[0058] 51. Support shell;

[0059] 511 pressure chamber;

[0060] 512 sensor cavity;

[0061] 513 Solenoid valve chamber;

[0062] 521 Air pump side fluid interface;

[0063] 522 Solenoid valve side fluid interface;

[0064] 523 Interface on the device to be diagnosed;

[0065] 53 Solenoid valve;

[0066] 531 solenoid valve sealing end;

[0067] 532 reference hole;

[0068] 533 airflow channel;

[0069] 54. Top cover plate;

[0070] 551 air pump;

[0071] 552 pressure sensor;

[0072] 553 First drive circuit board. Detailed Implementation

[0073] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0074] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein, and therefore the present invention is not limited to the specific embodiments disclosed below.

[0075] Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. However, the embodiments shown below are examples of integrated air pump assemblies used to embody the technical concept of the present invention, and the integrated air pump assembly of the present invention is not specifically defined as follows.

[0076] Figure 1 A cross-sectional view of a pressure sensor installation according to an embodiment of the prior art is disclosed, such as... Figure 1 As shown, existing pressure sensor mounting methods generally employ a separate housing design for the pressure sensor chip 101:

[0077] One side of the housing 103 is connected to the air outlet of the air pump, while the other side serves as the mounting position for the pressure sensor chip 101.

[0078] The pressure sensor chip 101 is fixed to the bottom of the housing 103, and its surrounding area is sealed with sealing resin 102.

[0079] The sealing resin serves both a sealing and fixing function here, thereby allowing the pressure applied to the sensor chip surface by the gas flow path to be detected.

[0080] However, existing methods have many drawbacks:

[0081] On the one hand, the addition of a housing and resin makes the assembly process more complicated and increases many failure factors, such as the possibility of leakage at the connection between the housing and the air pump outlet, and the possibility of defects such as air bubbles during the curing process of the sealing resin, which may affect the sealing effect.

[0082] On the other hand, the addition of the enclosure and resin also increased the overall cost.

[0083] To solve the above-mentioned technical problems, this utility model provides an integrated air pump assembly.

[0084] Figure 2 An exploded view of the components of an integrated air pump assembly according to an embodiment of the present invention is disclosed, as shown below. Figure 2 As shown, the integrated air pump assembly proposed in this utility model includes at least an air pump 200, a pressure sensor 300, and a first drive circuit board 400.

[0085] The air pump 200 is used to pump or extract air into the device to be diagnosed, and the air pump has an air pump housing.

[0086] The pressure sensor 300 is integrated on the air pump housing and is used to collect pressure signals;

[0087] The first drive circuit board 400 is electrically connected to the air pump 200 and the pressure sensor 300 respectively, and is used to drive the air pump 200 and the pressure sensor 300 and transmit pressure signals.

[0088] The integrated air pump assembly proposed in this utility model integrates a pressure sensor on the air pump. The pressure sensor can directly detect the pressure value of the module and accurately obtain the actual pressure value inside the device to be diagnosed. This effectively avoids the failure problem of pressure calculation deviation caused by factors such as current fluctuation in the prior art, thereby significantly improving the accuracy of oil tank leakage detection.

[0089] Meanwhile, this invention integrates the pressure sensor and air pump into one unit, which not only optimizes the internal structural layout of the product and avoids the space waste caused by the independent setting of each component in the prior art, but also effectively reduces the overall size of the product, making it more compact and lightweight. In addition, it simplifies the assembly process, reduces the assembly steps and connection points of parts, reduces the risk of errors and complexity in the assembly process, and improves the efficiency and reliability of assembly.

[0090] In one embodiment, the air pump housing is embedded with a PIN structure for connecting the pressure sensor 300 and / or the first drive circuit board 400.

[0091] The PIN structure includes a first PIN structure and a second PIN structure, used to achieve electrical connection and mechanical positioning and fixation.

[0092] The first driving circuit board 400 is a PCBA (Printed Circuit Board Assembly) circuit structure.

[0093] In this embodiment, the insert structure of the air pump housing is integrally formed with the air pump housing using an injection molding insert molding process.

[0094] The PIN header, a key conductive component, is made of metal and embedded within the plastic housing to transmit electrical signals and provide a stable electrical connection. Through PIN header injection molding technology, the air pump housing can achieve a highly integrated design, reducing additional connecting components, optimizing the assembly process, and improving structural reliability.

[0095] In one embodiment, the air pump housing includes a mounting bracket 211 for mounting the pressure sensor 300;

[0096] The fixed bracket 211 is integrally injection molded with the air pump housing.

[0097] More specifically, the air pump housing also includes a connecting base plate 212 and an air pump unit. The connecting base plate 212 has a first side and a second side. The fixing bracket 211 and the air pump unit are arranged on the first side of the connecting base plate along the axial direction of the air pump, and the drive circuit assembly is arranged on the second side of the connecting base plate 212.

[0098] The fixed bracket 211, the connecting base plate 212 and the air pump unit are integrally formed.

[0099] Figure 3a A first-view structural diagram of an air pump according to an embodiment of the present invention is disclosed, as shown below. Figure 3a As shown, the first end 221 of the first PIN structure is connected to the pressure sensor 300, and the second end 222 of the first PIN structure is connected to the first drive circuit board 400.

[0100] More specifically, the first PIN structure is injection molded into the air pump housing, and the first end 221 of the first PIN structure extends from the fixed bracket 211 and can be connected to the pressure sensor 300; the second end 222 of the first PIN structure extends from the second side of the connecting base plate 212 and can be directly connected to the contact end of the first drive circuit board 400.

[0101] Figure 3b A second-view structural diagram of an air pump according to an embodiment of the present invention is disclosed, as shown below. Figure 3b As shown, the first end 223 of the second PIN structure is connected to the power supply terminal of the air pump, and the second end 224 of the second PIN structure is connected to the first drive circuit board 400.

[0102] More specifically, the second PIN structure is injection molded into the air pump housing. The first end 223 of the second PIN structure extends from the air pump unit and can be connected to the power supply terminal of the air pump. The second end 224 of the first PIN structure extends from the second side of the connecting base plate 212 and can be directly connected to the contact terminal of the first drive circuit board 400.

[0103] The pressure sensor 300 is mounted on the air pump housing via a fixing bracket 211. Figure 4 and Figure 5 Two connection methods between the pressure sensor and the air pump are given.

[0104] Figure 4 A schematic diagram illustrating the connection between a pressure sensor and an air pump according to an embodiment of this utility model is shown, as follows: Figure 4 In the embodiment shown, the air pump housing further includes a second drive circuit board 301, which is fixedly mounted on the fixed bracket 211 and electrically connected to the first PIN structure.

[0105] The pressure sensor 300 is mounted on the second drive circuit board 301 and is electrically connected to the first PIN structure through the second drive circuit board 301.

[0106] Specifically:

[0107] The second drive circuit board 301 is electrically connected to the pressure sensor 300 and is used to drive and control the pressure sensor 300.

[0108] The second drive circuit board 301 is a PCBA circuit structure.

[0109] Furthermore, the second drive circuit board 301 is fixedly mounted on the fixed bracket 211 by welding or press-fitting to the first end 221 of the first PIN pin structure.

[0110] The second drive circuit board 301 is fixedly mounted on the fixed bracket 211 and connected to the first end 221 of the first PIN structure of the air pump housing, thereby realizing the electrical connection and signal transmission between the pressure sensor 300 and the first PIN structure.

[0111] Press-fit is a manufacturing process that uses mechanical pressure to assemble two or more parts (usually metal, but can also be plastic, etc.) together in a predetermined direction.

[0112] Furthermore, the pressure sensor 300 is connected to the second drive circuit board 301 via a PIN pin structure, thereby achieving electrical connection and fixation between the pressure sensor 300 and the second drive circuit board 301.

[0113] The pressure sensor 300 is integrated into the air pump housing. The housing of the pressure sensor 300 adopts an insert injection molded PIN structure. The pressure sensor 300 achieves efficient and stable circuit connection with the second drive circuit board 301 through the PIN.

[0114] Figure 5 A schematic diagram of the connection between the pressure sensor and the air pump according to another embodiment of the present invention is shown, as follows: Figure 5 Another embodiment shown illustrates a second connection method between the pressure sensor 300 and the air pump 200, wherein the pressure sensor 300 is directly fixed to the first PIN structure by welding.

[0115] The pressure sensor 300 can be directly fixedly installed on the first end 221 of the first PIN pin structure of the air pump by means of welding or laser welding.

[0116] The pressure sensor 300 is integrated into the air pump housing. In this embodiment, welding or laser welding is used as the main connection method.

[0117] Specifically, the welding process achieves metallurgical bonding between metals through molten solder, and features reliable connection and good electrical conductivity.

[0118] Laser welding, on the other hand, uses a high-energy-density laser beam as a heat source and achieves micron-level precision connections through precise control of welding parameters, making it particularly suitable for assembling precision electronic components. Both welding methods can provide sufficient mechanical strength while ensuring electrical connection reliability, enabling the pressure sensor 300 to form a permanent connection with the first end 221 of the first PIN structure.

[0119] Considering that the chip of the pressure sensor 300 will directly contact the oil and gas medium, this embodiment specifically applies a conformal coating to the surface of the electronic components on the second drive circuit board 301 to provide reliable protection. This protective design effectively extends the service life of the electronic components while ensuring the measurement accuracy of the sensor.

[0120] In this embodiment, the PIN pin structure mounted on the air pump is used to position and connect with the first drive circuit board 400 and the second drive circuit board 301. By eliminating the air pump's own guide (soft tube) connection structure, the positioning sub-parts required between the air pump and the first drive circuit board 400 are removed, reducing the number of product parts, simplifying the assembly process, and reducing product costs.

[0121] like Figure 4 and Figure 5 As shown, the air pump 200 is provided with a sealing ring 213 on the fixed bracket 213, which is used to achieve air circuit sealing.

[0122] More specifically, the connection between the fixed bracket 213 and the connecting base plate 212 is provided with a cylindrical mounting part:

[0123] The outer circumferential surface of the mounting part is interference-fitted with the inner wall of the sensor cavity, and a sealing ring 213 is provided between the mounting part and the inner wall of the sensor cavity.

[0124] It should be noted that the air pump 200 used in this utility model has a wide range of applicability in terms of type selection. It can flexibly select various pump types such as piezoelectric ceramic pump, rotor pump, diaphragm pump, vortex pump or screw pump according to the needs of specific application scenarios.

[0125] Among them, piezoelectric ceramic pumps are the preferred option due to their significant advantages such as compact structure, low energy consumption, and low noise. In practical applications, they can be further subdivided into two configurations: single-chamber air pumps and dual-chamber air pumps.

[0126] Single-chamber air pumps have a simple structure and low cost, making them suitable for applications where high flow rate is not required.

[0127] The dual-chamber air pump, through its alternating working chamber design, can provide a more stable and continuous airflow, significantly improving the module's working efficiency and stability.

[0128] This diverse range of pump options allows the present invention to adapt to pressure testing needs under different working conditions, greatly expanding the application scope and market adaptability of the product.

[0129] The integrated air pump assembly provided by this utility model saves the need for separate components used in sensor mounting support, reduces the number of product components, lowers product cost and assembly complexity, and eliminates product assembly failure caused by performance problems of the sensor mounting support components themselves.

[0130] Based on this integrated air pump assembly, this utility model further proposes a leak diagnosis module.

[0131] Figure 6 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 6 As shown, the leak diagnosis module proposed in this utility model includes at least a support housing 51 and an integrated air pump assembly.

[0132] The integrated air pump assembly is installed inside the support housing 51;

[0133] The support housing 51 has a pressure chamber 511 and a sensor chamber 512 inside;

[0134] The pressure chamber 511 and the sensor chamber 512 are connected through the airflow channel 533 of the supporting housing. The pressure chamber 511 is used to install the air pump 551, and the sensor chamber 512 is used to install the pressure sensor 552.

[0135] The support housing 51 is used to support and install the other components, and has a device-side interface 523 inside for connecting to an external device to be diagnosed.

[0136] An integrated air pump assembly is installed inside the support housing 51.

[0137] The air pump housing includes a fixed bracket for mounting the pressure sensor. The fixed bracket is sealed to the support housing 51 to form a closed sensor cavity structure.

[0138] The connection between the fixed bracket and the connecting base plate is provided with a cylindrical mounting part:

[0139] The outer circumferential surface of the mounting part is interference-fitted with the inner wall of the sensor cavity, and a sealing ring is provided between the mounting part and the inner wall of the sensor cavity.

[0140] The leakage diagnosis module proposed in this utility model also includes a solenoid valve 53 and an upper cover plate 54.

[0141] The solenoid valve 53 is installed inside the support housing 51 and is used to control the air passage connection to the interface 523 of the device under diagnosis.

[0142] The upper cover plate 54 is sealed to the support housing 51.

[0143] The integrated air pump assembly in this embodiment includes an air pump 551, a pressure sensor 552, and a first drive circuit board 553.

[0144] Pressure sensor 552 is integrated on air pump 551 for direct detection of pressure within the chamber;

[0145] The first drive circuit board 553 is mounted on the air pump 551 and is used to drive and control the operation of the air pump.

[0146] In this embodiment, the support housing 51 has a pressure chamber 511, a sensor chamber 512, and a solenoid valve chamber 513 inside.

[0147] The pressure chamber 511 is used to install the air pump 551; the sensor chamber 512 is used to install the pressure sensor 552; and the solenoid valve chamber 513 is used to install the solenoid valve 53.

[0148] The pressure chamber 511, sensor chamber 512, and solenoid valve chamber 513 are located in the same airflow channel 533.

[0149] The sensor cavity 512 is sealed to the fixed bracket of the air pump through a sealing ring, forming an air cavity structure independent of the pressure cavity 511.

[0150] Specifically, the pressure sensor 552 is precisely installed within the sensor cavity 512. The special structural design of this cavity not only eliminates measurement interference caused by airflow pulsations but also ensures that the sensor directly contacts and accurately senses pressure changes in the gas path. Through this optimized layout, the pressure sensor 552 can acquire real-time pressure values ​​within the pipeline, providing the module with accurate pressure monitoring data, thereby significantly improving the overall detection accuracy and response speed of the module.

[0151] The leak 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. The reference stage is used to verify the stability of the air pump 551 of the leak diagnosis module itself, providing reliable benchmark conditions for the subsequent diagnosis stage; the diagnosis stage is used to perform oil and gas leak tests on the equipment to be diagnosed.

[0152] When the leakage diagnosis module is in the reference phase:

[0153] When the solenoid valve 53 is in the closed state, it cuts off the air path between the external device to be diagnosed and the airflow channel 533, thereby isolating the connection path between the leak diagnosis module and the external device to be diagnosed.

[0154] The air passage between the solenoid valve side fluid interface 522 and the solenoid valve chamber 513 is in a connected state.

[0155] The air pump 551 draws gas from the outside atmosphere and pumps it into the airflow channel 533 or draws the gas in the airflow channel 533 into the outside atmosphere, performing pressurization or depressurization pumping operations on the reference circuit formed inside the leak diagnosis module.

[0156] Pressure sensor 552 continuously collects air pressure data to assess the performance of the leak diagnosis module itself.

[0157] During pressurization, the reference circuit consists of external gas sequentially passing through the pump-side fluid interface 521 and the pump 551 before entering the pressure chamber 511. After compression by the pump 551, the gas passes through the pressure chamber 511, through the airflow channel 533, the reference hole 532, and the solenoid valve chamber 513, before returning to the outside atmosphere via the solenoid valve-side fluid interface 522. When suction creates negative pressure, the reference circuit's gas path is reversed.

[0158] When the leakage diagnosis module is in the diagnosis phase:

[0159] When the solenoid valve 53 is in the open state, the interface 523 on the device to be diagnosed side of the support housing 51 is connected, connecting the external device to be diagnosed with the air passage of the airflow channel 533.

[0160] The fluid interface 522 on the solenoid valve side is in a closed state;

[0161] The air pump 551 draws gas from the outside atmosphere and pumps it into the airflow channel 533 or draws the gas in the airflow channel 533 into the outside atmosphere, establishing a diagnostic circuit from the inside of the leak diagnosis module to the device to be diagnosed.

[0162] Air pressure data is collected by pressure sensor 552 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.

[0163] During pressurization, the diagnostic circuit allows external gas to sequentially pass through the pump-side fluid interface 521 and the pump 551 into the pressure chamber 511. After being compressed by the pump 551, the gas passes through the airflow channel 533, the reference hole 532, the solenoid valve sealing end 531, and the solenoid valve chamber 513, and is then delivered to the device under test via the interface 523 on the device side. When negative pressure is created by suction, the diagnostic circuit's gas path is reversed.

[0164] The integrated air pump assembly and corresponding fuel tank leak diagnosis module provided by this utility model have the following beneficial effects:

[0165] 1) By integrating the pressure sensor with the air pump, and placing the pressure sensor completely in the detection air path, it is possible to detect pressure changes in the air path in real time and accurately, avoiding the pressure attenuation and response delay problems caused by connecting pipelines in traditional separate designs.

[0166] 2) The integrated design significantly reduces the connection pipes and installation space required in traditional solutions, making the entire module structure more compact;

[0167] 3) The integrated structure reduces the number of connection interfaces, effectively reducing the potential leakage risk of the module, while simplifying the assembly process and improving the overall reliability of the product.

[0168] 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.

[0169] 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 also includes the meaning of an interlayer between layers.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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. An integrated air pump assembly, characterized in that, It includes at least an air pump (200), a pressure sensor (300), and a first drive circuit board (400): The air pump (200) is used to pump or evacuate air to the device to be diagnosed, and the air pump has an air pump housing; The pressure sensor (300) is integrated on the air pump housing and is used to collect pressure signals; The first drive circuit board (400) is electrically connected to the air pump (200) and the pressure sensor (300) respectively, and is used to drive the air pump (200) and the pressure sensor (300) and transmit pressure signals.

2. The integrated air pump assembly according to claim 1, characterized in that, The air pump housing includes a mounting bracket (211) for mounting the pressure sensor (300); The fixed bracket (211) is integrally formed with the air pump housing.

3. The integrated air pump assembly according to claim 2, characterized in that, The air pump housing is embedded with a PIN structure for connecting the pressure sensor (300) and / or the first drive circuit board (400); The PIN pin structure includes a first PIN pin structure and a second PIN pin structure: The first end (221) of the first PIN structure is connected to the pressure sensor (300), and the second end (222) of the first PIN structure is connected to the first drive circuit board (400). The first end (223) of the second PIN structure is connected to the power supply end of the air pump, and the second end (224) of the second PIN structure is connected to the first drive circuit board (400).

4. The integrated air pump assembly according to claim 3, characterized in that, The air pump housing also includes a second drive circuit board (301), which is fixedly mounted on the fixed bracket (211) and electrically connected to the first PIN structure. The pressure sensor (300) is mounted on the second drive circuit board (301) and is electrically connected to the first PIN structure through the second drive circuit board (301).

5. The integrated air pump assembly according to claim 4, characterized in that, The second drive circuit board (301) is fixedly mounted on the fixed bracket (211) by welding or press-fitting to the first end (221) of the first PIN pin structure.

6. The integrated air pump assembly according to claim 3, characterized in that, The pressure sensor (300) is directly fixed to the first PIN pin structure by welding.

7. The integrated air pump assembly according to claim 3, characterized in that, The air pump housing also includes a connecting base plate (212) and an air pump unit. The connecting base plate (212) has a first side and a second side. The fixed bracket (211) and the air pump unit are arranged on the first side of the connecting base plate along the air pump axial direction. The drive circuit assembly is arranged on the second side of the connecting base plate (212). The fixed bracket (211), the connecting base plate (212), and the air pump unit are integrally formed.

8. The integrated air pump assembly according to claim 7, characterized in that, The first end (221) of the first PIN structure extends from the fixed bracket (211), and the second end (222) of the first PIN structure extends from the second side of the connecting base plate (212); The first end (223) of the second PIN structure extends from the air pump unit, and the second end (224) of the first PIN structure extends from the second side of the connecting base plate (212).

9. A leak diagnosis module, characterized in that, The leak diagnosis module includes an integrated air pump assembly and a support housing as described in any one of claims 1 to 8: The integrated air pump assembly is installed inside the support housing; The support housing has a pressure chamber and a sensor chamber inside; The pressure chamber and the sensor chamber are connected through the airflow channel of the supporting housing. The pressure chamber is used to install an air pump, and the sensor chamber is used to install a pressure sensor.

10. The leakage diagnosis module according to claim 9, characterized in that, The air pump housing includes a fixed bracket for mounting the pressure sensor. The fixed bracket is sealed to the support housing to form a closed sensor cavity structure.

11. The leakage diagnosis module according to claim 10, characterized in that, The connection between the fixed bracket and the connecting base plate is provided with a cylindrical mounting part: The outer circumferential surface of the mounting part is interference-fitted with the inner wall of the sensor cavity, and a sealing ring is provided between the mounting part and the inner wall of the sensor cavity.

12. The leakage diagnosis module according to claim 9, characterized in that, The air pump is a piezoelectric ceramic pump.

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