An automobile oil pan air tightness detection device

Abstract

The application discloses a kind of automobile oil pan air tightness detection device, it is related to the technical field of automobile oil pan, and the present application includes rotating assembly rotation connection in the inner wall of ring body, rotating assembly is provided with air bag between oil pan, rotating assembly is installed with air inlet valve, air inlet valve is communicated with air bag, air inlet valve outer wall is communicated with gas guide valve, and one end of gas guide valve is communicated with exhaust pipe, the present application is inflated to the air bag of base plate lower surface by air inlet valve, air bag expands and extrudes the internal space of closed cavity, if oil pan exists tiny crack and sand eye, gas will be discharged to the inside of box by tiny crack and sand eye, and bubble is generated in the inside of box, food-grade water-based pigment in pool, when leaking, will form obvious colored trace with bubble, so that staff observes the position of oil pan outer wall leakage point.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile oil sump, in particular to an automobile oil sump air tightness detection device. BACKGROUND

[0002] The automobile oil sump is the core component of the engine oil storage, and its air tightness directly affects the safety of the engine lubrication system. If there are small cracks and sand holes in the oil sump shell, it will cause oil leakage and oil level drop, and further cause engine wear and tear, overheating and even scrap. Therefore, the automobile oil sump air tightness detection device is the key equipment to ensure the quality of the engine.

[0003] The existing automobile oil sump shell detection is usually to set the oil sump on the bottom die, and a sealing gasket is arranged between the oil sump and the bottom die. The oil sump is continuously pressed down by the pressing rod, and then the inside of the measured oil sump is filled with gas. The ultrasonic leak detector is used to detect whether the oil sump shell has gas leakage. However, during the detection process, the leak detector can only detect whether the oil sump has air tightness, and the staff cannot directly observe the leakage point of the oil sump, which will cause the subsequent repair position of the oil sump to be difficult to determine. To solve the above problems, the present application provides an automobile oil sump air tightness detection device. SUMMARY

[0004] In order to solve the problem that the leakage point is not easy to observe, the present application provides an automobile oil sump air tightness detection device.

[0005] To solve the above technical problems, the present application adopts the following technical scheme: an automobile oil sump air tightness detection device, comprising a box body for loading food-grade water-based pigment, a rotating assembly, an oil sump and an air inlet pipe. The oil sump is installed at the bottom of the rotating assembly to form a closed cavity. A sealing gasket is arranged between the oil sump and the rotating assembly. The air inlet pipe is in communication with the closed cavity through the oil sump. The top of the box body is fixedly connected with a support rod. The upper surface of the support rod is provided with a gas cylinder. The output end of the gas cylinder penetrates through the support rod and is fixedly connected with a ring body.

[0006] The rotating assembly is rotatably connected to the inner wall of the ring body. A gas bag is arranged between the rotating assembly and the oil sump.

[0007] An air inlet valve is installed on the rotating assembly and is in communication with the gas bag. A gas guide valve is communicated on the outer wall of the air inlet valve. An exhaust pipe is communicated at one end of the gas guide valve.

[0008] A limiting assembly is arranged between the rotating assembly and the oil sump for supporting and fixing the oil sump. A transfer assembly for transferring the oil sump is installed on the outer wall of the support rod.

[0009] Preferably, the transfer assembly comprises a support frame, a first slot frame, a first spring and a second slot frame, the two second slot frames are fixedly connected to the outer walls of the two support rods respectively, the first slot frame is slidingly connected to the inner wall of the second slot frame, and the support frame is slidingly connected between the two first slot frames; the first slot frame is provided with a first spring for resetting the support frame.

[0010] The support frame is provided with an extension end in the form of a U-shaped structure for supporting the two sides of the oil pan.

[0011] Preferably, the rotating assembly comprises a base plate, rotating wheels rotatably connected to the two ends of the base plate, a motor mounted on the upper surface of the base plate, an output shaft of the motor connected to the rotating shaft of the rotating wheel, a drive gear connected to the bottom end of the rotating shaft of the rotating wheel, a tooth ring provided on the inner wall of the bottom of the ring body, the drive gear and the tooth ring being in meshing engagement with each other, and groove rails provided on the two sides of the base plate.

[0012] Preferably, the limiting assembly comprises a sliding frame and a bearing frame, the top of the sliding frame is slidingly connected to the inner wall of the groove rail, and the bearing frame is slidingly connected to the inner wall of the sliding frame; the inner wall of the sliding frame is provided with a second spring for resetting the bearing frame.

[0013] Preferably, a first insertion hole is formed in the groove rail, a second insertion hole is formed in the bearing frame, and the bifurcated end of the U-shaped limiting rod is inserted into the inner walls of the first insertion hole and the second insertion hole, respectively.

[0014] Preferably, the air bag is mounted on the lower surface of the base plate, the air inlet valve comprises a first valve body and an air inlet valve core, the first valve body is in communication with the air bag through the base plate, two symmetrical sliding grooves are formed in the inner wall of the first valve body, the air inlet valve core is slidingly connected to the sliding grooves and has a gap with the inner wall of the first valve body, and a third spring is mounted in the first valve body for resetting the air inlet valve core.

[0015] Preferably, the air guide valve comprises a second valve body and an air guide valve core, the second valve body is in communication with the bottom of the first valve body, two symmetrical moving grooves are formed in the inner wall of the second valve body, the air guide valve core is slidingly connected to the moving grooves, and a fourth spring is mounted in the second valve body for resetting the air guide valve core.

[0016] Preferably, an exhaust pipe is communicated with one end of the second valve body, a connecting rod is fixedly connected to the outer wall of the air guide valve core, the connecting rod extends to the outside through the exhaust pipe, and a gap is formed between the connecting rod and the inner wall of the exhaust pipe.

[0017] Preferably, a plurality of exhaust holes are formed on the outer wall of the exhaust pipe, and the plurality of exhaust holes are directed towards the outer wall of the oil pan.

[0018] Preferably, the sealing gasket is arranged at the edge between the lower surface of the base plate and the upper surface of the oil pan.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1. The air bag of the lower surface of the base plate is inflated by the air inlet valve, the air bag is expanded and presses the internal space of the closed cavity, if the oil pan has a small crack and a pinhole, the gas will be discharged to the inside of the box through the small crack and the pinhole, the food-grade water-based pigment in the water tank will form obvious colored marks with the bubbles when leaking, so that the staff can observe the position of the leakage point of the outer wall of the oil pan.

[0021] 2. The air bag is exhausted by poking the air inlet valve core, a part of the gas in the air bag is discharged, a small amount of water flow flows into the inside of the oil pan under the action of negative pressure, and the food-grade water-based pigment leaves color when flowing at the leakage point of the inner wall of the oil pan, so that the position of the leakage point of the inner wall can be directly observed by the naked eye.

[0022] 3. The outer wall and the inner wall of the oil pan are marked with colored leakage points by detaching the oil pan from the base plate, so that the subsequent repair and maintenance of the oil pan are facilitated. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0025] Figure 2 It is a schematic diagram of the structure of the oil pan of the present application.

[0026] Figure 3 It is a schematic diagram of the structure of the box and the oil pan of the present application.

[0027] Figure 4 It is a schematic diagram of the structure of the box and the oil pan of the present application. Figure 3

[0028] Figure 5 It is a schematic diagram of the transport assembly of the present application.

[0029] ​Figure 6 Figure 1 is a schematic diagram of the rotating assembly and ring body of the present application.

[0030] Figure 7 Figure 2 is a schematic diagram of the inlet valve and guide valve structure of the present application.

[0031] Figure 8 Figure 3 is a schematic diagram of the U-shaped limiting rod structure of the present application.

[0032] Figure 9 Figure 4 is a schematic diagram of the structure at B in the present application. Figure 8

[0033] Figure 10 Figure 5 is a schematic diagram of the limiting assembly of the present application.

[0034] Figure 11 Figure 6 is a schematic diagram of the air bag structure of the present application.

[0035] Figure 12 Figure 7 is a schematic diagram of the internal structure of the inlet valve, guide valve and air bag of the present application.

[0036] Figure 13 Figure 8 is a schematic diagram of the rotating assembly of the present application.

[0037] Figure 14 Figure 9 is a schematic diagram of the structure at C in the present application. Figure 5

[0038] Figure 1 is a schematic diagram of the rotating assembly and ring body of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application. EMBODIMENT ​​

[0040] As shown in Figure 1 - Figure 14 The application provides an automobile oil pan air tightness detection device, which comprises a box body 1 for containing food-grade water-based pigment, a rotating assembly 5, an oil pan 7 and an air inlet pipe 9. The oil pan 7 is installed at the bottom of the rotating assembly 5 to form a closed cavity. A sealing gasket is arranged between the oil pan 7 and the rotating assembly 5. The air inlet pipe 9 is in communication with the closed cavity through the oil pan 7. The top of the box body 1 is fixedly connected with a supporting rod 8. The upper surface of the supporting rod 8 is provided with a cylinder 2. The output end of the cylinder 2 penetrates through the supporting rod 8 and is fixedly connected with a ring body 4.

[0041] The rotating assembly 5 is rotatably connected to the inner wall of the ring body 4. A gas bag 14 is arranged between the rotating assembly 5 and the oil pan 7.

[0042] An air inlet valve 10 is arranged on the rotating assembly 5 and is in communication with the gas bag 14. An air guide valve 11 is in communication with the outer wall of the air inlet valve 10. An exhaust pipe 12 is in communication with one end of the air guide valve 11.

[0043] A limiting assembly 6 is arranged between the rotating assembly 5 and the oil pan 7 and is used for supporting and fixing the oil pan 7. A transfer assembly 3 for transferring the oil pan 7 is arranged on the outer wall of the supporting rod 8.

[0044] As shown in Figure 3 - Figure 4 The transfer assembly 3 comprises a supporting frame 301, a first groove frame 302, a first spring 303 and a second groove frame 304. Two second groove frames 304 are fixedly connected to the outer walls of two supporting rods 8. The first groove frame 302 is slidably connected to the inner wall of the second groove frame 304. The supporting frame 301 is slidably connected between the two first groove frames 302. The first spring 303 is arranged on the first groove frame 302 and is used for resetting the supporting frame 301.

[0045] The supporting frame 301 is provided with an extension end which is in a U shape and is used for supporting the two sides of the oil pan 7.

[0046] The purpose of the arrangement is to realize the feeding of the oil pan 7 through the transfer assembly 3. The U-shaped extension end of the supporting frame 301 lifts the oil pan 7 from both sides, compresses the first spring 303 to lower the height of the oil pan 7, and the first groove frame 302 slides in the second groove frame 304 to facilitate the oil pan 7 passing through the exhaust pipe 12. When the oil pan 7 is moved to below the base plate 501, the oil pan 7 is reset close to the lower surface of the base plate 501 in cooperation with the first spring 303.

[0047] As shown in Figure 13As shown, the rotating assembly 5 comprises a base plate 501, both ends of the base plate 501 are rotatably connected with rotating wheels 502, the upper surface of the base plate 501 is provided with a motor 503, the output shaft of the motor 503 is connected with the rotating shaft of the rotating wheel 502, the bottom end of the rotating shaft of the rotating wheel 502 is connected with a drive gear 504, the inner wall of the bottom of the ring body 4 is provided with a gear ring 401, the drive gear 504 and the gear ring 401 are engaged with each other, and both sides of the base plate 501 are provided with groove rails 505;

[0048] The purpose of such arrangement is that after the gas in the air bag 14 is exhausted, the rotating wheel 502 is driven to rotate by the output shaft of the motor 503, the drive gear 504 is engaged with the gear ring 401 to prevent slipping, so that the base plate 501 and the oil pan 7 rotate on the inner side of the ring body 4, and the water stains on the surface of the oil pan 7 are spun dry in the process of rotation.

[0049] As shown in the figure, Figure 10 The limiting assembly 6 comprises a sliding frame 601 and a bearing frame 603, the top of the sliding frame 601 is slidably connected to the inner wall of the groove rail 505, the bearing frame 603 is slidably connected to the inner wall of the sliding frame 601, and the inner wall of the sliding frame 601 is provided with a second spring 602 for resetting the bearing frame 603;

[0050] The purpose of such arrangement is to further fix the oil pan 7 by the limiting assembly 6, the sliding frame 601 slides along the groove rail 505 of the rotating assembly 5 to both sides of the oil pan 7, and the bearing frame 603 is attached to the lower surface of the edge of the oil pan 7 under the pushing force of the second spring 602.

[0051] As shown in the figure, Figure 9 The groove rail 505 is provided with a first insertion hole 5050, the bearing frame 603 is provided with a second insertion hole 604, and one end of the U-shaped limiting rod 13 is provided with a bifurcation, and the bifurcated end is respectively inserted into the inner wall of the first insertion hole 5050 and the second insertion hole 604;

[0052] The purpose of such arrangement is to insert the U-shaped limiting rod 13, the bifurcated end of which is respectively inserted into the first insertion hole 5050 of the groove rail and the second insertion hole 604 of the bearing frame, and the locking position is ensured to prevent the oil pan 7 from shaking during detection.

[0053] As shown in the figure, Figure 12 The air bag 14 is installed on the lower surface of the base plate 501, the air inlet valve 10 comprises a first valve body 1001 and an air inlet valve core 1003, the first valve body 1001 is communicated with the air bag 14 through the base plate 501, two symmetrical sliding grooves are arranged on the inner wall of the first valve body 1001, the air inlet valve core 1003 is slidably connected to the sliding grooves and has a gap with the inner wall of the first valve body 1001, and the inside of the first valve body 1001 is provided with a third spring 1002 for resetting the air inlet valve core 1003;

[0054] The purpose of the arrangement is that the air bag 14 is exhausted by the air inlet valve core 1003, the gas in the air bag 14 is discharged, a part of the gas is discharged, a negative pressure is generated in the oil pan 7, a small amount of water flows into the oil pan 7 under the action of the negative pressure, and the food-grade water-based pigment is left when the food-grade water-based pigment flows at the leakage point on the inner wall of the oil pan 7, so that the position of the inner wall leakage point can be directly observed by the naked eye.

[0055] As shown in Figure 12 , the air guide valve 11 comprises a second valve body 1101 and an air guide valve core 1103, the second valve body 1101 is in communication with the bottom of the first valve body 1001, two symmetrical moving grooves are arranged on the inner wall of the second valve body 1101, the air guide valve core 1103 is slidably connected in the moving grooves, and the fourth spring 1102 for resetting the air guide valve core 1103 is arranged in the second valve body 1101.

[0056] The purpose of the arrangement is that the air guide valve 11 is used for guiding the remaining gas in the air bag 14 to the exhaust pipe 12 for discharge, and the water stains on the outer wall of the oil pan 7 are cleaned.

[0057] One end of the second valve body 1101 is in communication with the exhaust pipe 12, the outer wall of the air guide valve core 1103 is fixedly connected with the connecting rod 1104, the connecting rod 1104 extends to the outside through the exhaust pipe 12, and a gap is left between the connecting rod 1104 and the inner wall of the exhaust pipe 12.

[0058] The purpose of the arrangement is that the exhaust pipe 12 is located outside the oil pan 7, and the Figure 12 connecting rod 1104 drives the air guide valve core 1103 to move and extrude the fourth spring 1102, so that the remaining gas in the air bag 14 flows to the exhaust pipe 12 through the air guide valve 11, flows to the surface of the oil pan 7 through the exhaust hole of the exhaust pipe 12, and blows the water stains on the surface of the oil pan 7.

[0059] A plurality of exhaust holes are formed in the outer wall of the exhaust pipe 12, and the plurality of exhaust holes are directed to the outer wall of the oil pan 7 and used for gas discharge.

[0060] The sealing gasket is arranged between the lower surface of the base plate 501 and the edge of the upper surface of the oil pan 7, and the joint between the lower surface of the base plate 501 and the upper surface of the oil pan 7 is sealed during the air tightness detection.

[0061] Working principle: the oil pan 7 is loaded by the transfer assembly 3, the U-shaped extension end of the support frame 301 holds the oil pan 7 from both sides, and the Figure 2 and Figure 14The U-shaped extension end of the support frame 301 is provided with a protrusion which is inserted into the mounting hole of the oil pan 7. This prevents the oil pan 7 from being tilted during lifting. The compression of the first spring 303 reduces the height of the oil pan 7. The first slot frame 302 slides in the second slot frame 304, facilitating the passage of the oil pan 7 through the exhaust pipe 12. When the oil pan 7 is moved under the base plate 501, the elastic reset of the first spring 303 allows the oil pan 7 to be close to the lower surface of the base plate 501.

[0062] The oil pan 7 is further fixed by the limiting assembly 6. The sliding frame 601 slides along the slot rail 505 of the rotating assembly 5 to the both sides of the oil pan 7. The carrier frame 603 is attached to the lower surface of the edge of the oil pan 7 under the thrust of the second spring 602, and then the U-shaped limiting rod 13 is inserted. The bifurcated ends of the U-shaped limiting rod 13 are inserted into the first insertion hole 5050 of the slot rail and the second insertion hole 604 of the carrier frame, respectively, to lock the position and ensure that the oil pan 7 does not shake during detection.

[0063] The driving output end of the cylinder 2 is lowered, driving the ring body 4 and the rotating assembly 5 to move downward synchronously, moving into the inside of the box body 1 until the liquid in the inside of the box body 1 overflows the entire oil pan 7.

[0064] The detection gas is filled into the closed cavity between the oil pan 7 and the base plate 501 through the air inlet pipe 9, so as to establish an initial pressure in the inside of the cavity.

[0065] At the same time, the air bag 14 under the lower surface of the base plate 501 is inflated through the air inlet valve 10. The air inlet valve core 1003 slides along the sliding groove of the first valve body 1001 and compresses the third spring 1002 under the thrust of the gas pressure. The gas enters the air bag 14 through the gap. The air bag 14 expands and squeezes the internal space of the closed cavity. If the oil pan 7 has a small crack and a pinhole, the gas will be discharged to the inside of the box body 1 through the small crack and the pinhole, generating bubbles in the inside of the box body 1. The food-grade aqueous colorant in the pool will form obvious colored traces with the bubbles when leaking, so that the staff can observe the position of the leakage point on the outer wall of the oil pan.

[0066] The air bag 14 is exhausted by poking the air inlet valve core 1003. A part of the gas in the air bag 14 is discharged, generating a negative pressure in the inside of the oil pan 7. A small amount of water flow flows into the inside of the oil pan 7 under the action of the negative pressure. The food-grade aqueous colorant leaves color when flowing through the leakage point on the inner wall of the oil pan 7, so that the position of the inner wall leakage point can be directly observed by the naked eye. At the same time, the food-grade aqueous colorant used in the inside of the box body 1 is easy to clean after detection and does not corrode during use.

[0067] The base plate 501 and the oil pan 7 are lifted out of the box body 1 by the cylinder 2, and the outer wall leakage point is marked. The exhaust pipe 12 is located on the outside of the oil pan 7, combined with the color of the food-grade aqueous colorant, the position of the outer wall leakage point can be observed. Figure 12The push rod 1104 drives the air guide valve core 1103 to move and extrude the fourth spring 1102, so that the remaining gas in the air bag 14 flows to the exhaust pipe 12 through the air guide valve 11, and then flows to the surface of the oil pan 7 through the exhaust hole of the exhaust pipe 12, so as to blow the surface of the oil pan 7;

[0068] After the gas in the air bag 14 is exhausted, the output shaft of the motor 503 drives the rotating wheel 502 to rotate, the driving gear 504 is engaged with the gear ring 401 to prevent slipping, so that the base plate 501 and the oil pan 7 rotate on the inner side of the ring body 4, and the water stains on the surface of the oil pan 7 are dried in the rotating process;

[0069] Then, the oil pan 7 is detached from the base plate 501, the inner wall leakage point is marked, the oil pan 7 leakage point is marked, which is convenient for subsequent repair and maintenance of the oil pan 7, and a small amount of water stains in the oil pan 7 is cleaned, so that the air tightness detection of the oil pan 7 is completed.

[0070] The standard parts used in the application can be purchased from the market, the special-shaped parts can be ordered according to the description and drawings, the specific connection mode of each part adopts the conventional means such as bolt, rivet and welding in the prior art, the mechanical parts and equipment adopt the conventional type in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here.

[0071] Obviously, those skilled in the art can make various modifications and variations to the application without departing from the spirit and scope of the application. Therefore, if these modifications and variations of the application belong to the scope of the claims of the application and the equivalent technology, the application also intends to include these modifications and variations.

Claims

1. An automobile oil pan air tightness detection device, comprising a box body (1) for loading food-grade aqueous pigment, a rotating assembly (5), an oil pan (7) and an air inlet pipe (9), the oil pan (7) is installed at the bottom of the rotating assembly (5) to form a closed cavity, a sealing gasket is arranged between the oil pan (7) and the rotating assembly (5), and the air inlet pipe (9) is communicated with the closed cavity through the oil pan (7), characterized in that: The top of the box (1) is fixedly connected with a support rod (8), the upper surface of the support rod (8) is provided with a cylinder (2), the output end of the cylinder (2) penetrates the support rod (8), and the output end of the cylinder (2) is fixedly connected with a ring body (4); ​ The rotating assembly (5) is rotatably connected to the inner wall of the ring body (4), and the rotating assembly (5) is provided with an air bag (14) between the oil pan (7); The rotating assembly (5) is provided with an air inlet valve (10), the air inlet valve (10) is communicated with the air bag (14), the outer wall of the air inlet valve (10) is communicated with a gas guide valve (11), and one end of the gas guide valve (11) is communicated with an exhaust pipe (12); The rotating assembly (5) and the oil pan (7) are provided with a limiting assembly (6) for supporting and fixing the oil pan (7), and the outer wall of the support rod (8) is provided with a transfer assembly (3) for transferring the oil pan (7); The transfer assembly (3) comprises a support frame (301), a first slot frame (302), a first spring (303) and a second slot frame (304), two second slot frames (304) are fixedly connected to the outer walls of the two support rods (8), the first slot frame (302) is slidably connected to the inner wall of the second slot frame (304), the support frame (301) is slidably connected between the two first slot frames (302), and the first slot frame (302) is provided with the first spring (303) for resetting the support frame (301); The support frame (301) is provided with an extension end which is U-shaped and used for supporting the two sides of the oil pan (7); The rotating assembly (5) comprises a base plate (501), both ends of the base plate (501) are rotatably connected with rotating wheels (502), the upper surface of the base plate (501) is provided with a motor (503), the output shaft of the motor (503) is connected with the rotating shaft of the rotating wheel (502), the bottom end of the rotating shaft of the rotating wheel (502) is connected with a drive gear (504), the bottom inner wall of the ring body (4) is provided with a gear ring (401), the drive gear (504) and the gear ring (401) are meshed with each other, and both sides of the base plate (501) are provided with slot rails (505); The limiting assembly (6) comprises a sliding frame (601) and a bearing frame (603), the top of the sliding frame (601) is slidably connected to the inner wall of the slot rail (505), the bearing frame (603) is slidably connected to the inner wall of the sliding frame (601), and the inner wall of the sliding frame (601) is provided with the second spring (602) for resetting the bearing frame (603); First insertion holes (5050) are formed in the slot rails (505), second insertion holes (604) are formed in the bearing frame (603), one end of the U-shaped limiting rod (13) is provided with a bifurcation, and the bifurcation ends are respectively inserted into the inner walls of the first insertion holes (5050) and the second insertion holes (604).

2. The apparatus for detecting the air tightness of an oil pan of an automobile according to claim 1, wherein The air bag (14) is installed on the lower surface of the base plate (501), the air inlet valve (10) comprises a first valve body (1001) and an air inlet valve core (1003), the first valve body (1001) is communicated with the air bag (14) through the base plate (501), two symmetrical sliding grooves are arranged on the inner wall of the first valve body (1001), the air inlet valve core (1003) is slidingly connected on the sliding grooves and a gap is left between the air inlet valve core (1003) and the inner wall of the first valve body (1001), and the first valve body (1001) is internally provided with a third spring (1002) for resetting the air inlet valve core (1003).

3. The apparatus for detecting the air tightness of an oil pan of an automobile according to claim 2, wherein The air guide valve (11) comprises a second valve body (1101) and an air guide valve core (1103), the second valve body (1101) is communicated with the bottom of the first valve body (1001), two symmetrical moving grooves are arranged on the inner wall of the second valve body (1101), the air guide valve core (1103) is slidingly connected on the moving grooves, and the second valve body (1101) is internally provided with a fourth spring (1102) for resetting the air guide valve core (1103).

4. The apparatus for detecting the air tightness of an oil pan of an automobile according to claim 3, wherein One end of the second valve body (1101) is communicated with the exhaust pipe (12), the outer wall of the air guide valve core (1103) is fixedly connected with a connecting rod (1104), the connecting rod (1104) extends to the outside through the exhaust pipe (12), and a gap is left between the connecting rod (1104) and the inner wall of the exhaust pipe (12).

5. The apparatus for detecting the air tightness of an oil pan of an automobile according to claim 4, wherein A plurality of exhaust holes are formed in the outer wall of the exhaust pipe (12), and the plurality of exhaust holes are directed to the outer wall of the oil pan (7).

6. The apparatus for detecting the air tightness of an oil pan of an automobile according to claim 5, wherein The sealing gasket is arranged between the lower surface of the base plate (501) and the edge of the upper surface of the oil pan (7).

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