Air pump, oil leakage diagnosis device and vehicle

Abstract

The utility model discloses an air pump, an oil leakage diagnostic device and a vehicle, the air pump comprises a pump body, a movement mechanism, a first sealing element and a motor, the pump body is provided with a first containing cavity, and an air inlet and an air outlet which are communicated with the first containing cavity are formed in the pump body; the movement mechanism is movably arranged in the first accommodating cavity; the first sealing piece is movably arranged on the side, close to the first containing cavity, of the air inlet; an output shaft of the motor penetrates through the pump body and is connected with the movement mechanism; when the motor is in a power-off state, one end of the movement mechanism blocks the air outlet, and the first sealing piece blocks the air inlet; when the motor is in a power-on state, the first sealing piece is separated from the air inlet, the air inlet is made to communicate with the first containing cavity, the movement mechanism reciprocates in the first containing cavity, and the first containing cavity is made to indirectly communicate with the air outlet. According to the air pump, accumulated water is prevented from being accumulated in the first containing cavity when the air humidity is large, the interior of the first containing cavity can be kept dry all the time, and the moisture resistance of the air pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air pumps, in particular to an air pump, an oil leakage diagnostic device and a vehicle. Background Art

[0002] In the prior art, the air pumps of fuel evaporation and leak diagnostic modules all use a direct air intake and exhaust design. When the air humidity is high, a certain amount of water will accumulate in the air pump, affecting its operation and causing excessive current draw, which in turn affects the diagnostic accuracy of the fuel evaporation and leak diagnostic module. To address this issue, a PTC heater is typically added to the air pump to dry out the accumulated water. However, this only works when the water level is low. If the water level is high, the PTC heater may not be able to completely dry it out. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide an air pump that can prevent water from accumulating in the first accommodating chamber when the air humidity is high, thereby maintaining the first accommodating chamber dry at all times and preventing the air pump from consuming excessive current.

[0004] Another object of the present invention is to provide an oil leakage diagnostic device comprising the above-mentioned air pump.

[0005] Another object of the present invention is to provide a vehicle comprising the above-mentioned oil leakage diagnostic device.

[0006] According to the embodiment of the first aspect of the present invention, the air pump includes: a pump body, the pump body has a first accommodating chamber, and the pump body is formed with an air inlet and an air outlet connected to the first accommodating chamber; a moving mechanism, the moving mechanism is movably arranged in the first accommodating chamber; a first sealing member, the first sealing member is movably arranged on a side of the air inlet adjacent to the first accommodating chamber; a motor, the output shaft of the motor passes through the pump body and is connected to the moving mechanism; wherein, when the motor is in a power-off state, one end of the moving mechanism blocks the air outlet, and the first sealing member blocks the air inlet; when the motor is in a power-on state, the first sealing member is separated from the air inlet, so that the air inlet is connected to the first accommodating chamber, and the moving mechanism performs reciprocating motion in the first accommodating chamber, so that the first accommodating chamber is indirectly connected to the air outlet.

[0007] According to an embodiment of the present invention, the air pump is provided with a motion mechanism within the first accommodating chamber of the pump body and a first sealing member at the air inlet. This allows the first accommodating chamber to communicate with the outside world through the air outlet and the air inlet when the motor is powered on. When the motor is powered off, the air outlet and the air inlet are blocked, isolating the first accommodating chamber from the outside world. This prevents water from accumulating in the first accommodating chamber when humidity is high, allowing the first accommodating chamber to remain dry at all times. This prevents excessive current from flowing in the air pump, and further ensures diagnostic accuracy when the air pump is used in an oil leak diagnostic device.

[0008] According to some embodiments of the present utility model, the motion mechanism includes a second seal, a cam, a motion bracket and an elastic member, the second seal is connected to one end of the motion bracket adjacent to the air outlet, the spring member is connected to one end of the motion bracket away from the air outlet and abuts against the side wall of the first accommodating cavity, the cam is arranged on the side of the motion bracket away from the air inlet and is connected to the output shaft of the motor; when the motor is in the power-on state, the motor drives the cam to rotate, and one end of the cam is in indirect contact with the motion bracket, and when the one end of the cam contacts the motion bracket, it pushes the motion bracket to compress the elastic member so that the second seal is gradually separated from the air outlet.

[0009] According to some embodiments of the present invention, a distance between an end of the cam adjacent to the second sealing member and the central axis of the output shaft is greater than a distance between an end of the cam adjacent to the elastic member and the central axis of the output shaft.

[0010] According to some embodiments of the present invention, the moving bracket member includes: a first bracket segment, the first bracket segment is parallel to the cam; a second bracket segment, the second bracket segment is connected to a side of the first bracket segment adjacent to the elastic member, the second bracket segment extends in a direction perpendicular to the first bracket segment, and when the motor is in the power-on state, the one end of the cam is indirectly in contact with the second bracket segment.

[0011] According to some embodiments of the present invention, a soft rubber part is provided on the side of the first bracket segment away from the second bracket segment, and the soft rubber part is interference fit with the first accommodating cavity, dividing the first accommodating cavity into a first sub-cavity and a second sub-cavity that are not connected to each other, the first sub-cavity is suitable for communicating with the air outlet, and the second sub-cavity is suitable for communicating with the air inlet.

[0012] According to the oil leakage diagnostic device of the second embodiment of the present utility model, it includes: a shell, the shell has a second accommodating chamber and a third accommodating chamber, the second accommodating chamber and the third accommodating chamber are connected through a main air duct, a first interface and a second interface are formed on the shell, the second accommodating chamber is connected to the engine or the fuel tank through the first interface, and the second accommodating chamber and the third accommodating chamber are connected to the outside world through the second interface; a solenoid valve, the solenoid valve is arranged in the second accommodating chamber; an air pump, the air pump is arranged in the third accommodating chamber, the air inlet of the air pump is connected to the second interface, the air outlet of the air pump is connected to the second accommodating chamber, the first air flow channel of the air pump is connected to the main air duct, and the air pump is the air pump according to the above-mentioned first embodiment of the present utility model.

[0013] According to some embodiments of the present invention, a connecting hole and a second air flow channel are formed on the shell, and the two ends of the connecting hole are respectively connected to the second accommodating chamber and the main air channel, and one end of the second air flow channel is connected to the second interface; the solenoid valve has a vent, and one end of the vent is connected to the other end of the second air flow channel; wherein, when the solenoid valve is powered off, the connecting hole is blocked and the other end of the vent is opened; when the solenoid valve is powered on, the connecting hole is opened and the other end of the vent is blocked.

[0014] According to some embodiments of the present invention, a reference hole is formed on the shell, and the two ends of the reference hole are respectively connected to the second accommodating chamber and the main air channel; the oil leakage diagnostic device has a learning mode and a diagnostic mode. When the oil leakage diagnostic device is in the learning mode, the solenoid valve is powered off, the air pump is started, and the outside air is pressurized by the air pump and flows to the outside or the air pump through the first air flow channel, the main air channel, the reference hole and the second accommodating chamber; when the oil leakage diagnostic device is in the diagnostic mode, the solenoid valve is powered on, the air pump is started, and the outside air is pressurized by the air pump and flows to the oil tank through the first air flow channel, the main air channel, the connecting hole, the second accommodating chamber and the first interface.

[0015] According to some embodiments of the present utility model, the oil leakage diagnostic device has an adsorption mode and a desorption mode. When the oil leakage diagnostic device is in the adsorption mode, the solenoid valve and the air pump are both powered off, and the oil vapor in the oil tank flows to the outside through the first interface, the vent, the second accommodating chamber, the second air flow channel and the second interface; when the oil leakage diagnostic device is in the desorption mode, the solenoid valve and the air pump are both powered off, and the outside air flows to the engine through the second interface, the second air flow channel, the second accommodating chamber, the vent and the first interface.

[0016] A vehicle according to an embodiment of the third aspect of the present utility model includes the oil leakage diagnostic device according to the embodiment of the second aspect of the present utility model.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a cross-sectional view of an oil leakage diagnostic device according to an embodiment of the present utility model;

[0020] Figure 2 yes Figure 1 A cross-sectional view of the oil leakage diagnostic device shown in another angle;

[0021] Figure 3 yes Figure 1 The schematic diagram of the oil leakage diagnostic device shown is a diagram showing that the air outlet of the air pump is in a closed state;

[0022] Figure 4 yes Figure 1 A schematic diagram of the motion mechanism of the air pump of the oil leakage diagnostic device shown;

[0023] Figure 5 yes Figure 1 The schematic diagram of the oil leakage diagnostic device shown is a diagram showing that the air outlet of the air pump is in an open state;

[0024] Figure 6 yes Figure 1 A partial enlarged view of the oil leakage diagnostic device shown;

[0025] Figure 7 yes Figure 1 A schematic diagram of the housing of an air pump of an oil leakage diagnostic device is shown;

[0026] Figure 8 yes Figure 1 A schematic diagram of the housing of the air pump of the oil leakage diagnostic device shown in FIG.

[0027] Figure 9 yes Figure 1 A schematic diagram of the housing of the air pump of the oil leakage diagnostic device shown in FIG. 1 is shown at another angle;

[0028] Figure 10 yes Figure 1 A cross-sectional view of the housing of the air pump of the oil leakage diagnostic device shown;

[0029] Figure 11 is a schematic diagram of an oil leakage diagnostic device in an adsorption mode according to an embodiment of the present utility model;

[0030] Figure 12 yes Figure 11 A schematic diagram of the oil leak diagnostic device shown in adsorption mode;

[0031] Figure 13 is a schematic diagram of an oil leakage diagnostic device in a desorption mode according to an embodiment of the present utility model;

[0032] Figure 14 yes Figure 13 A schematic diagram of the oil leak diagnostic device shown in a desorption mode;

[0033] Figure 15 is a schematic diagram of an oil leakage diagnostic device in a learning mode according to an embodiment of the present utility model;

[0034] Figure 16 yes Figure 15 Schematic diagram of the oil leak diagnostic device in a learning mode is shown;

[0035] Figure 17 This is a principle diagram of the oil leakage diagnostic device in the diagnostic mode according to an embodiment of the utility model.

[0036] Reference numerals:

[0037] 100: Oil leakage diagnostic device;

[0038] 10: air pump; 110: pump body; 111: first accommodating chamber; 111a: first sub-chamber; 111b: second sub-chamber; 112: air inlet; 113: air outlet; 114: first air flow channel; 120: motion mechanism; 121: second sealing member; 122: cam; 123: motion bracket; 123a: first bracket section; 123b: second bracket section; 124: elastic member; 125: soft rubber member; 130: first sealing member; 140: motor; 141: output shaft; 20 : housing; 210: second accommodating chamber; 220: third accommodating chamber; 230: main air channel; 240: first interface; 250: second interface; 260: first housing portion; 270: second housing portion; 280: communicating hole; 290: second air flow channel; 291: reference hole; 292: third air flow channel; 30: solenoid valve; 310: coil; 320: moving iron core; 330: first position-limiting bracket; 331: vent hole; 340: spring member; 360: valve cover; 40: filter;

[0039] 300: Engine; 400: Fuel tank; 500: Shut-off valve; 600: Control valve; 700: Carbon canister. DETAILED DESCRIPTION

[0040] Reference below Figures 1-10 An air pump 10 according to an embodiment of the first aspect of the present invention will be described.

[0041] like Figures 1-10 As shown, the air pump 10 according to the embodiment of the first aspect of the present invention includes: a pump body 110, a motion mechanism 120, a first sealing member 130 and a motor 140.

[0042] Specifically, the pump body 110 has a first accommodating chamber 111, and is formed with an air inlet 112 and an air outlet 113 that communicate with the first accommodating chamber 111. The motion mechanism 120 is movably disposed within the first accommodating chamber 111, and a first sealing member 130 is movably disposed on a side of the air inlet 112 adjacent to the first accommodating chamber 111. The output shaft 141 of the motor 140 passes through the pump body 110 and is connected to the motion mechanism 120.

[0043] For example, in Figures 1-10 In the example, the axial direction of the output shaft 141 of the motor 140 may be consistent with the height direction of the pump body 110, and the air inlet 112 is formed in the height direction of the pump body 110 (for example, Figure 1 The first sealing member 130 can move along the height direction of the pump body 110. The motor 140 can be arranged on the other side of the height direction of the pump body 110, and the output shaft 141 of the motor 140 is arranged through the pump body 110 and connected to the motion mechanism 120. The motion mechanism 120 can move along the length direction of the pump body 110 (for example, Figure 1 The air outlet 113 and the air inlet 112 are respectively located on both sides of the movement direction of the movement mechanism 120.

[0044] Among them, when the motor 140 is in the power-off state, one end of the moving mechanism 120 blocks the air outlet 113, and the first sealing member 130 blocks the air inlet 112; when the motor 140 is in the power-on state, the first sealing member 130 is separated from the air inlet 112, so that the air inlet 112 is connected to the first accommodating chamber 111, and the moving mechanism 120 reciprocates in the first accommodating chamber 111, so that the first accommodating chamber 111 is indirectly connected to the air outlet 113.

[0045] Specifically, if Figure 3 and Figure 6As shown, when the motor 140 is energized, the output shaft 141 of the motor 140 rotates to drive the moving mechanism 120 to move back and forth along the length direction of the pump body 110, that is, when the moving mechanism 120 moves toward the air outlet 113, the moving mechanism 120 gradually blocks the air outlet 113, and when the moving mechanism 120 moves toward the air inlet 112, the moving mechanism 120 separates from the air outlet 113, so that the air outlet 113 is connected to the first accommodating chamber 111, and the gas in the first accommodating chamber 111 can be output; at the same time, since the other gases around the first seal 130 are sucked into the first accommodating chamber 111 and bounce up, the air pressure around the first seal 130 is lower than the external atmospheric pressure, so that the external atmospheric pressure will push the first seal 130 upward, so that the air inlet 112 is connected to the outside world, so that the air pump 10 can draw sufficient air.

[0046] When the motor 140 stops running (i.e., the motor 140 is in a power-off state), the first sealing member 130 moves downward due to its own gravity to block the air inlet 112. Simultaneously, the motion mechanism 120 moves toward the air outlet 113 until one end of the motion mechanism 120 blocks the air outlet 113. Thus, when the air pump 10 is not operating, both the air inlet 112 and the air outlet 113 are sealed, effectively isolating the first accommodating chamber 111 from the outside world. This prevents water from accumulating in the first accommodating chamber 111 when the air humidity is high, thereby keeping the first accommodating chamber 111 dry at all times. This prevents the air pump 10 from drawing excessive current, thereby ensuring diagnostic accuracy when the air pump 10 is used in the oil leakage diagnostic device 100.

[0047] According to the air pump 10 of the embodiment of the present invention, a motion mechanism 120 is provided in the first accommodating chamber 111 of the pump body 110, and a first sealing member 130 is provided at the air inlet 112. When the motor 140 is powered on, the first accommodating chamber 111 can communicate with the outside world through the air outlet 113 and the air inlet 112. When the motor 140 is powered off, the air outlet 113 and the air inlet 112 are blocked, isolating the first accommodating chamber 111 from the outside world. In this way, water accumulation in the first accommodating chamber 111 when the air humidity is high can be avoided, and the first accommodating chamber 111 can always be kept dry, thereby preventing the air pump 10 from drawing too much current. Furthermore, when the air pump 10 is used in the oil leakage diagnostic device 100, the diagnostic accuracy can be guaranteed.

[0048] According to some embodiments of the present invention, the motion mechanism 120 includes a second sealing member 121, a cam 122, a motion bracket 123, and an elastic member 124. The second sealing member 121 is connected to one end of the motion bracket 123 adjacent to the air outlet 113. The elastic member 124 is connected to one end of the motion bracket 123 away from the air outlet 113 and abuts against the side wall of the first accommodating cavity 111. The cam 122 is provided on the side of the motion bracket 123 away from the air inlet 112 and is connected to the output shaft 141 of the motor 140. Figure 1 、 Figure 3 and Figure 4 As shown, the second sealing member 121, the moving bracket 123, and the elastic member 124 are arranged along the length of the pump body 110. The moving bracket 123 is located between the second sealing member 121 and the elastic member 124. The two ends of the elastic member 124 are respectively connected to the moving bracket 123 and the inner wall of the first accommodating chamber 111. The cam 122 is provided on the side of the moving bracket 123 adjacent to the output shaft 141 of the motor 140. Optionally, the elastic member 124 may be a spring, but is not limited thereto.

[0049] When the motor 140 is powered on, the motor 140 drives the cam 122 to rotate, and one end of the cam 122 indirectly contacts the moving bracket 123. When the above end of the cam 122 contacts the moving bracket 123, it pushes the moving bracket 123 to compress the elastic member 124, so that the second sealing member 121 is gradually separated from the air outlet 113. Figure 3 and Figure 4 The cam 122 is disposed at a first end and a second end in the longitudinal direction of the pump body 110, with the first end adjacent to the second sealing member 121 and the second end adjacent to the elastic member 124. When the motor 140 is energized, the output shaft 141 of the motor 140 drives the cam 122 to rotate. At this time, the cam 122 rotates around the axial direction of the output shaft 141.

[0050] Among them, such as Figure 3 As shown, when the first end of the cam 122 rotates toward the elastic member 124, the first end gradually contacts the moving bracket 123 and pushes out the moving bracket 123 to compress the elastic member 124, thereby driving the second sealing member 121 to move toward the elastic member 124, so that the air outlet 113 gradually communicates with the first accommodating chamber 111; Figure 5 As shown, when the first end of the cam 122 rotates toward the direction of the second sealing member 121, the first end gradually separates from the moving bracket 123 until the first end is completely separated from the moving bracket 123, and the restoring force of the elastic member 124 pushes the moving bracket 123 toward the direction of the second sealing member 121, thereby driving the second sealing member 121 to move toward the air outlet 113, so that the second sealing member 121 gradually blocks the air outlet 113; the above movement process is repeated so that the air outlet 113 and the first accommodating chamber 111 are indirectly connected.

[0051] Further, refer to Figure 3 and Figure 4 The distance between one end of the second sealing member 121 of the cam 122 and the central axis of the output shaft 141 is greater than the distance between one end of the cam 122 adjacent to the elastic member 124 and the central axis of the output shaft 141. In other words, the maximum distance between the first end and the central axis of the output shaft 141 is greater than the maximum distance between the second end and the central axis of the output shaft 141, and the output shaft 141 of the motor 140 is eccentrically disposed.

[0052] For example, the cross-sectional area of ​​the cam 122 gradually increases in the direction toward the elastic member 124, that is, the shape of the cam 122 is roughly triangular. The end of the moving bracket 123 adjacent to the elastic member 124 is the contact end. The maximum distance between the second end and the central axis of the output shaft 141 is less than or equal to the minimum distance between the contact end and the central axis of the output shaft 141, that is, there is no force between the second end and the contact end, and the moving bracket 123 cannot be pushed to move. The maximum distance between the first end and the central axis of the output shaft 141 is greater than the minimum distance between the contact end and the central axis of the output shaft 141, that is, there is a force between the first end and the contact end to push the moving bracket 123 to move. In this way, the reciprocating motion of the moving bracket 123 is achieved.

[0053] According to some specific embodiments of the present invention, the motion bracket 123 includes a first bracket segment 123a and a second bracket segment 123b. The first bracket segment 123a is parallel to the cam 122, and the second bracket segment 123b is connected to the side of the first bracket segment 123a adjacent to the elastic member 124. The second bracket segment 123b extends in a direction perpendicular to the first bracket segment 123a. When the motor 140 is powered on, the above-mentioned end of the cam 122 is indirectly in contact with the second bracket segment 123b. Figure 1 、 Figure 3 and Figure 4 As shown, the motion bracket 123 is L-shaped, with the first bracket segment 123a extending along the length of the pump body 110 and located below the cam 122. The second bracket segment 123b extends along the height of the pump body 110 and is connected to one end of the elastic member 124. When the cam 122 rotates, the first end of the cam 122 contacts the second bracket segment 123b, pushing the second bracket segment 123b to compress the elastic member 124, facilitating the second sealing member 121 to open the air outlet 113. This increases the contact area between the cam 122 and the motion bracket 123, enabling the reciprocating motion of the motion mechanism 120. Furthermore, the motion bracket 123 has a simple structure and is easy to manufacture.

[0054] Furthermore, a soft rubber part 125 is provided on the side of the first bracket section 123a away from the second bracket section 123b. The soft rubber part 125 is interference-fitted with the first accommodating cavity 111, dividing the first accommodating cavity 111 into a first sub-cavity 111a and a second sub-cavity 111b that are not connected to each other. The first sub-cavity 111a is suitable for communicating with the air outlet 113, and the second sub-cavity 111b is suitable for communicating with the air inlet 112. Figure 4 The soft rubber part 125 is provided between the first bracket section 123a and the second sealing member 121 bracket, and is interference-fitted in the first accommodating chamber 111 to separate the first accommodating chamber 111 into a first sub-chamber 111a and a second sub-chamber 111b arranged along the length direction of the pump body 110. During the operation of the air pump 10, when the air pump 10 builds up pressure to a certain level, the pressure in the first sub-chamber 111a is greater than the pressure in the second sub-chamber 111b, and the pressure difference between the first sub-chamber 111a and the second sub-chamber 111b is greater than the restoring force of the elastic member 124, the movable bracket 123 section will be pushed to compress the elastic member 124, so that the elastic member 124 is always kept in a compressed state, thereby keeping the air outlet 113 always in an open state. At this time, there is no need for the cam 122 to push the movable bracket 123, that is, the cam 122 is in an idling state. In this way, the normal operation of the air pump 10 is ensured.

[0055] After the air pump 10 has completed its work, it is turned on to the power-off state. As the pressure in the first sub-chamber 111a gradually decreases, the restoring force of the pressurized elastic member 124 will push the moving bracket 123 toward the air outlet 113 until the second sealing member 121 completely blocks the air outlet 113, so that when the air pump 10 is not working, the interior of the air pump 10 is separated from the outside world, avoiding water accumulation inside the air pump 10 and improving the moisture resistance of the air pump 10.

[0056] Optionally, the soft plastic part 125 can be integrally formed with the motion bracket 123 by two-color injection molding.

[0057] like Figures 1-17 As shown, the oil leakage diagnostic device 100 according to the second embodiment of the present utility model includes: a housing 20, a solenoid valve 30 and an air pump 10.

[0058] Specifically, the housing 20 has a second accommodating chamber 210 and a third accommodating chamber 220, which are connected via a main air passage 230. A first interface 240 and a second interface 250 are formed on the housing 20. The second accommodating chamber 210 is connected to the engine 300 or the fuel tank 400 via the first interface 240, and the second accommodating chamber 210 and the third accommodating chamber 220 are connected to the outside world via the second interface 250. The solenoid valve 30 is disposed in the second accommodating chamber 210. The air pump 10 is disposed in the third accommodating chamber 220, the air inlet 112 of the air pump 10 is connected to the second interface 250, the air outlet 113 of the air pump 10 is connected to the second accommodating chamber 210, and the first air flow channel 114 of the air pump 10 is connected to the main air passage 230. The air pump 10 is an air pump 10 according to the embodiment of the first aspect of the utility model.

[0059] For example, in Figures 1-17 In the example, the housing 20 includes a first housing portion 260 and a second housing portion 270. The first housing portion 260 is located above the second housing portion 270 and together define a second accommodating chamber 210 and a third accommodating chamber 220. The solenoid valve 30 is vertically disposed within the second accommodating chamber 210, and the air pump 10 is vertically disposed within the third accommodating chamber 220. The main air passage 230 is formed on the second housing portion 270 and is located below the solenoid valve 30 and the air pump 10. A first airflow channel 114 is formed on the pump body 110 of the air pump 10. The two ends of the first airflow channel 114 are respectively connected to the first accommodating chamber 111 of the pump body 110 and the main air passage 230.

[0060] When the oil leak diagnostic device 100 is operating, the solenoid valve 30 and the air pump 10 are both energized. The outside air flows into the air pump 10 through the second port 250 and the air inlet 112. After the air pump 10 builds pressure, the gas flows through the main air passage 230 to the second chamber 210. The gas in the second chamber 210 then flows through the first port 240 to the engine 300 and the fuel tank 400. The current value of the air pump 10 at this time is recorded as the first current value. Alternatively, when the gas in the second chamber 210 is discharged to the outside or enters the air pump 10, the current value of the air pump 10 at this time is recorded as the second current value. By comparing the first and second current values, it is determined whether the engine 300 or the fuel tank 400 is leaking fuel.

[0061] Specifically, when the first current value is greater than the second current value, the fuel leakage is small, meeting the maximum fuel leakage requirement; when the second current value is greater than the first current value, it exceeds the maximum fuel leakage requirement. At this time, the engine 300 or the fuel tank 400 needs to be tested to ensure the driving safety of the vehicle.

[0062] According to the oil leakage diagnostic device 100 of the embodiment of the present invention, by adopting the above-mentioned air pump 10, it is possible to avoid water accumulation inside the air pump 10 and ensure that the inside of the air pump 10 is dry, thereby ensuring the diagnostic accuracy of the oil leakage diagnostic device 100, which is beneficial for the oil leakage diagnostic device 100 to accurately detect whether there is oil leakage in the engine 300 or the fuel tank 400.

[0063] According to some embodiments of the present invention, a connecting hole 280 and a second airflow channel 290 are formed in the housing 20. The two ends of the connecting hole 280 are connected to the second accommodating chamber 210 and the main airway 230, respectively. One end of the second airflow channel 290 is connected to the second port 250. The solenoid valve 30 has a vent 331, one end of which is connected to the other end of the second airflow channel 290. When the solenoid valve 30 is powered off, the connecting hole 280 is blocked, and the other end of the vent 331 is open. When the solenoid valve 30 is powered on, the connecting hole 280 is open, and the other end of the vent 331 is blocked.

[0064] like Figure 1 、 Figure 2 、 Figure 7 and Figure 8 As shown, the bottom wall of the second accommodating chamber 210 is formed with a communication hole 280, through which the second accommodating chamber 210 communicates with the main air passage 230. The side wall of the second accommodating chamber 210 is formed with a second air flow channel 290, through which the second accommodating chamber 210 communicates with the second interface 250. The solenoid valve 30 includes a coil 310, a movable iron core 320, and a spring member 340. One end of the movable iron core 320 extends into the coil 310, and the spring member 340 is sleeved on the movable iron core 320. The movable iron core 320 is connected to the second housing portion 270 via a limiting bracket 330. The limiting bracket 330 is formed with a vent 331. The other end of the movable iron core 320 passes through the vent 331 and is connected to the valve cover 360.

[0065] like Figure 11 As shown, when the solenoid valve 30 is powered off, the valve cover 360 and the limiting bracket 330 are separated, that is, the vent hole 331 is open, and one end of the communication hole 280 is blocked by the valve cover 360. Figure 1 As shown, when the solenoid valve 30 is energized, the coil 310 will generate suction on the moving iron core 320. At this time, the moving iron core 320 drives the valve cover 360 to move toward the coil 310 and compresses the spring member 340 until the valve cover 360 and the limit bracket 330 stop to block the vent 331. At the same time, the connecting hole 280 is opened, and the gas in the first air flow channel 114 of the air pump 10 can flow to the second accommodating chamber 210 through the main air channel 230 and the connecting hole 280. After power is cut off, the valve cover 360 is pushed to move in the direction away from the limit bracket 330 under the action of the restoring force of the spring member 340 until the valve cover 360 blocks the connecting hole 280.

[0066] According to some embodiments of the present invention, a reference hole 291 is formed on the housing 20, and both ends of the reference hole 291 are respectively connected to the second accommodating cavity 210 and the main air channel 230. Figure 1 As shown, a filter 40 is provided in the reference hole 291 for filtering the gas flowing through the reference hole 291 to ensure the cleanliness of the air flowing into the second accommodating chamber 210 .

[0067] The oil leakage diagnostic device 100 has a learning mode and a diagnostic mode.

[0068] When the oil leakage diagnostic device 100 is in the learning mode, the solenoid valve 30 is powered off, the air pump 10 is started, and the external air is pressurized by the air pump 10 and flows to the outside or the air pump 10 through the first air flow channel 114, the main air channel 230, the reference hole 291 and the second accommodating chamber 210.

[0069] like Figure 15 and Figure 16 As shown, when the oil leakage diagnostic device 100 is applied to a vehicle, the first interface 240 of the oil leakage diagnostic device 100 is connected to one end of the carbon canister 700, and the other end of the carbon canister 700 is respectively connected to the manifold of the engine 300 and the fuel tank 400, a control valve 600 is arranged between the carbon canister 700 and the manifold, and a shut-off valve 500 is arranged between the carbon canister 700 and the fuel tank 400.

[0070] When the oil leakage diagnostic device 100 is in the learning mode, the control valve 600 and the stop valve 500 are both closed, and the solenoid valve 30 is in the power-off state. At this time, the air pump 10 is started. Since a third air flow channel 292 is formed on the side wall of the third accommodating chamber 220, the third air flow channel 292 is connected to the second interface 250, so that outside air can enter the air pump 10 through the second interface 250, the third air flow channel 292, the third accommodating chamber 220 and the air inlet 112. After the air pump 10 pressurizes the air, it flows to the second accommodating chamber 210 through the first air flow channel 114, the main air channel 230 and the reference hole 291. The gas in the second accommodating chamber 210 can flow to the outside or the third air flow channel 292 through the second air flow channel 290 and the second interface 250. At this time, the current value of the air pump 10 is the first current value.

[0071] When the oil leakage diagnostic device 100 is in diagnostic mode, the solenoid valve 30 is energized, the air pump 10 is started, and the external air is pressurized by the air pump 10 and flows to the oil tank 400 through the first air flow channel 114, the main air channel 230, the connecting hole 280, the second accommodating chamber 210 and the first interface 240.

[0072] like Figure 17As shown, when the oil leakage diagnostic device 100 is in diagnostic mode, the control valve 600 is closed, the shut-off valve 500 is open, and both the solenoid valve 30 and the air pump 10 are energized. At this time, the coil 310 of the solenoid valve 30 generates suction on the moving iron core 320, driving the valve cover 360 to move toward the limit bracket 330 until the valve cover 360 and the limit bracket 330 abut against each other, blocking the vent 331 and opening the connecting hole 280. External air enters the air pump 10 through the second port 250, the third air flow channel 292, the third accommodating chamber 220, and the air inlet 112. The air is pressurized by the air pump 10 and flows into the second accommodating chamber 210 through the first air flow channel 114, the main air channel 230, and the connecting hole 280. The gas in the second accommodating chamber 210 flows through the first port 240 to the carbon canister 700 and finally to the fuel tank 400. At this time, the current value of the air pump 10 is the second current value.

[0073] Therefore, when the first current value is larger than the second current value, the fuel leakage is small, meeting the maximum fuel leakage requirement; when the second current value is larger than the first current value, it exceeds the maximum fuel leakage requirement, and at this time, the engine 300 or the fuel tank 400 needs to be tested to ensure the driving safety of the vehicle.

[0074] Furthermore, the oil leakage diagnostic device 100 has an adsorption mode and a desorption mode.

[0075] When the oil leakage diagnostic device 100 is in adsorption mode, the solenoid valve 30 and the air pump 10 are both powered off, and the oil vapor in the oil tank 400 flows to the outside through the first interface 240, the vent 331, the second accommodating chamber 210, the second air flow channel 290 and the second interface 250.

[0076] like Figure 11 and Figure 12 As shown, when the oil leakage diagnostic device 100 is in adsorption mode, the control valve 600 is closed, the shut-off valve 500 is open, the solenoid valve 30 and the air pump 10 are both de-energized, and the oil vapor in the oil tank 400 flows to the carbon canister 700. After the carbon canister 700 absorbs the oil in the oil vapor, the air containing a small amount of oil flows to the second accommodating chamber 210 through the first interface 240. The air in the second accommodating chamber 210 flows to the outside through the vent 331, the second air flow channel 290, and the second interface 250. This allows the oil tank 400 to be directly connected to the outside atmosphere, ensuring pressure balance within the oil tank 400.

[0077] When the oil leakage diagnostic device 100 is in the desorption mode, the solenoid valve 30 and the air pump 10 are both powered off, and the outside air flows to the engine 300 through the second interface 250, the second air flow channel 290, the second accommodating chamber 210, the vent 331 and the first interface 240.

[0078] like Figure 13 and Figure 14As shown, when the engine 300 is started, the oil leakage diagnostic device 100 operates in the desorption mode, the shut-off valve 500 is closed, the control valve 600 is opened, the engine 300 is started to generate suction force, and the outside air flows to the second accommodating chamber 210 through the second interface 250 and the second air flow channel 290, and the gas in the second accommodating chamber 210 flows to the carbon canister 700 through the vent 331 and the first interface 240, and the air in the carbon canister 700 flows to the manifold of the engine 300 through the control valve 600 for combustion to ensure the normal operation of the engine 300.

[0079] The vehicle according to the embodiment of the third aspect of the present utility model includes the oil leakage diagnosis device 100 according to the embodiment of the second aspect of the present utility model.

[0080] According to the vehicle of the embodiment of the present utility model, by adopting the above-mentioned oil leakage diagnosis device 100, it is possible to accurately determine whether the vehicle has a fluid leakage, thereby ensuring the driving safety of the vehicle.

[0081] Other structures and operations of the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0082] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0083] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0084] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0085] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air pump, characterized in that: include: A pump body, the pump body having a first accommodating cavity, and an air inlet and an air outlet communicated with the first accommodating cavity being formed on the pump body; a motion mechanism, the motion mechanism being movably disposed in the first accommodating chamber; a first sealing member movably disposed on a side of the air inlet adjacent to the first accommodating cavity; a motor, wherein an output shaft of the motor passes through the pump body and is connected to the motion mechanism; In which, when the motor is in a power-off state, one end of the motion mechanism blocks the air outlet, and the first sealing member blocks the air inlet; when the motor is in a power-on state, the first sealing member is separated from the air inlet, so that the air inlet is connected to the first accommodating cavity, and the motion mechanism reciprocates in the first accommodating cavity, so that the first accommodating cavity is indirectly connected to the air outlet.

2. The air pump according to claim 1, characterized in that The motion mechanism includes a second sealing member, a cam, a motion bracket, and an elastic member, wherein the second sealing member is connected to an end of the motion bracket adjacent to the air outlet, the elastic member is connected to an end of the motion bracket away from the air outlet and abuts against a side wall of the first accommodating cavity, and the cam is provided on a side of the motion bracket away from the air inlet and connected to the output shaft of the motor; When the motor is in the power-on state, the motor drives the cam to rotate, and one end of the cam indirectly contacts the moving bracket. When the one end of the cam contacts the moving bracket, it pushes the moving bracket to compress the elastic member, so that the second sealing member is gradually separated from the air outlet.

3. The air pump according to claim 2, characterized in that A distance between an end of the cam adjacent to the second sealing member and a central axis of the output shaft is greater than a distance between an end of the cam adjacent to the elastic member and the central axis of the output shaft.

4. The air pump according to claim 2, characterized in that The motion bracket comprises: a first bracket segment, wherein the first bracket segment is parallel to the cam; A second bracket segment, the second bracket segment is connected to a side of the first bracket segment adjacent to the elastic member, the second bracket segment extends in a direction perpendicular to the first bracket segment, and when the motor is in the power-on state, the one end of the cam is in indirect contact with the second bracket segment.

5. The air pump according to claim 4, characterized in that A soft rubber part is provided on the side of the first bracket segment away from the second bracket segment. The soft rubber part is interference fit with the first accommodating cavity, dividing the first accommodating cavity into a first sub-cavity and a second sub-cavity that are not connected to each other. The first sub-cavity is suitable for communicating with the air outlet, and the second sub-cavity is suitable for communicating with the air inlet.

6. An oil leakage diagnostic device, characterized in that: include: a housing, the housing having a second accommodating chamber and a third accommodating chamber, the second accommodating chamber and the third accommodating chamber being in communication with each other via a main air passage, a first interface and a second interface being formed on the housing, the second accommodating chamber being in communication with the engine or the fuel tank via the first interface, and the second accommodating chamber and the third accommodating chamber being in communication with the outside world via the second interface; a solenoid valve, the solenoid valve being disposed in the second accommodating chamber; An air pump, wherein the air pump is arranged in the third accommodating chamber, the air inlet of the air pump is connected to the second interface, the air outlet of the air pump is connected to the second accommodating chamber, the first air flow channel of the air pump is connected to the main air channel, and the air pump is an air pump according to any one of claims 1-5.

7. The oil leakage diagnostic device according to claim 6, characterized in that: The housing is formed with a communication hole and a second air flow channel, the two ends of the communication hole are respectively connected to the second accommodating cavity and the main air channel, and one end of the second air flow channel is connected to the second interface; The solenoid valve has a vent hole, one end of which is connected to the other end of the second air flow channel; When the solenoid valve is powered off, the communicating hole is blocked and the other end of the vent hole is open; when the solenoid valve is powered on, the communicating hole is open and the other end of the vent hole is blocked.

8. The oil leakage diagnostic device according to claim 7, characterized in that: A reference hole is formed on the housing, and two ends of the reference hole are respectively communicated with the second accommodating cavity and the main air channel; The oil leakage diagnostic device has a learning mode and a diagnostic mode. When the oil leakage diagnostic device is in the learning mode, the solenoid valve is powered off, the air pump is started, and the outside air is pressurized by the air pump and flows to the outside or the air pump through the first air flow channel, the main air channel, the reference hole and the second accommodating cavity; When the oil leakage diagnostic device is in the diagnostic mode, the solenoid valve is energized, the air pump is started, and the external air is pressurized by the air pump and flows into the oil tank through the first air flow channel, the main air channel, the connecting hole, the second accommodating chamber and the first interface.

9. The oil leakage diagnostic device according to claim 8, characterized in that: The oil leakage diagnostic device has an adsorption mode and a desorption mode. When the oil leakage diagnostic device is in the adsorption mode, the solenoid valve and the air pump are both powered off, and the oil vapor in the oil tank flows to the outside through the first interface, the vent hole, the second accommodating cavity, the second air flow channel, and the second interface; When the oil leakage diagnostic device is in the desorption mode, the solenoid valve and the air pump are both powered off, and external air flows to the engine through the second interface, the second air flow channel, the second accommodating chamber, the vent hole and the first interface.

10. A vehicle, characterized in that: It comprises the oil leakage diagnostic device according to any one of claims 6-9.

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