Engine exhaust pipe sealing test device

Abstract

The invention relates to an engine exhaust pipe sealing test device. The device comprises a supporting body, a first air communicating pipe, a second air communicating pipe and a plurality of sealing locking units, wherein a plurality of first through holes are formed between the upper surface and the bottom surface of the supporting body; each sealing locking unit comprises an air cylinder body, a piston body, a top plate and a rubber plate, the first end of the piston body is slidably mounted in the air cylinder body, the second end of the piston body penetrates through the first through hole and protrudes out of the upper surface of the supporting body, the second end, the air cylinder body and the supporting body form a first sealed cavity, and the first end and the air cylinder body form a second sealed cavity; the first air communicating pipe is communicated with the first closed cavity, and the second air communicating pipe is communicated with the second closed cavity. Compared with the prior art, the device provided by the embodiment of the invention has the advantages that the force applied to each exhaust manifold connecting flange by each top plate is the same after the series cylinder bodies are ventilated, so that the problem of deformation of the exhaust manifold connecting flanges caused by non-uniform stress in the sealing test process is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine, in particular to an engine exhaust pipe sealing test device. BACKGROUND

[0002] Engine exhaust pipe (11) Figure 1 ) is a pipe component of engine exhaust system, mainly composed of exhaust main pipe 11, exhaust manifold 12, exhaust main pipe connecting flange 14 and exhaust manifold connecting flange 13, etc. The number of exhaust manifold 12 and exhaust manifold connecting flange 13 is set according to actual conditions. Each exhaust manifold 12 is relatively independent in position and communicates with the exhaust main pipe 11, and the exhaust pipe as a whole is connected with the engine base through the connecting flange. The sealing performance of the engine exhaust pipe is of vital importance to the performance and emission of the engine. If the sealing performance of the exhaust pipe is poor, it will cause leakage problems in the entire exhaust system, thereby affecting the power output of the engine, increasing fuel consumption, and also possibly causing harmful gas emission to exceed the standard. At present, in the process of engine production, the sealing performance of the exhaust pipe needs to be detected to ensure that its quality meets the design requirements.

[0003] The sealing test tool of the prior art adopts the mode of sealing each exhaust pipe opening separately, which has some obvious deficiencies, such as: deformation of the exhaust manifold connecting flange caused by uneven stress during the sealing test process; poor reliability of the tool, high skill level required for the operator, and low detection efficiency; different sizes of exhaust pipe components, customized tool, and high cost. SUMMARY

[0004] The technical problem to be solved by the present application is the problem of great difficulty in sealing test assembly technology and deformation of the exhaust manifold connecting flange caused by uneven stress during the sealing test process.

[0005] To solve the above technical problems, the present application provides an engine exhaust pipe sealing test device, which comprises a support body, a first air communication pipe, a second air communication pipe and a plurality of sealing lock units, and a plurality of first through holes are provided between the upper surface and the bottom surface of the support body; each sealing lock unit comprises a cylinder body, a piston body, a top plate and a rubber plate, the cylinder body is fixedly installed on the bottom surface of the support body; the first end of the piston body is slidably installed in the cylinder body, the second end protrudes from the upper surface of the support body through the first through hole, the second end forms a first closed chamber with the cylinder body and the support body, and the first end forms a second closed chamber with the cylinder body; the top plate is fixedly installed on the second end of the piston body; the rubber plate is arranged between the exhaust manifold connecting flange and the top plate; wherein the first air communication pipe communicates with the first closed chamber, and the second air communication pipe communicates with the second closed chamber.

[0006] As a preferred scheme, a manual air distribution valve is further included, one end of the valve is connected to the power air interface, and the other end is selectively connected to the first air communication pipe or the second air communication pipe.

[0007] As a preferred scheme, an air inlet unit is further included, the air inlet unit comprises a pressure test air interface and a fixed sealing structure, the pressure test air interface is in communication with the exhaust main pipe, and the fixed sealing structure is used to seal and connect the pressure test air interface and the exhaust main pipe flange.

[0008] As a preferred scheme, a second through hole is arranged between the side surface and the bottom surface of the support body, the second through hole is in communication with the first sealed chamber, and the first air communication pipe is in communication with the first sealed chamber through the second through hole.

[0009] As a preferred scheme, a third through hole is arranged at the bottom of the cylinder body, the third through hole is in communication with the second sealed chamber, and the second air communication pipe is in communication with the first sealed chamber through the third through hole.

[0010] As a preferred scheme, the sealing lock unit further comprises an O-shaped sealing ring, a mounting groove is arranged on the side wall of the first through hole, and the O-shaped sealing ring is mounted in the mounting groove to achieve the sliding sealing cooperation between the second end of the piston body and the support body.

[0011] As a preferred scheme, a stepped protrusion is arranged at the bottom of the cylinder body.

[0012] As a preferred scheme, the first air communication pipe and the second air communication pipe are rigid pipes.

[0013] As a preferred scheme, the sealing lock unit further comprises a stop bolt, the stop bolt is fixedly mounted on the upper surface of the support body, and is used to lock the movement of the exhaust manifold connecting flange and the upper surface of the support body.

[0014] As a preferred scheme, a turnover support shaft is further included, the turnover support shaft is fixed at both ends of the support body.

[0015] Compared with the prior art, the technical scheme provided by the embodiment of the present application can at least achieve the following beneficial effects:

[0016] Firstly, the device utilizes the principle that the same force is applied to each exhaust manifold connecting flange of the exhaust pipe component by each top plate after the ventilation of the series cylinder body, thereby ensuring that the force applied to each exhaust manifold connecting flange of the exhaust pipe component is uniform during the sealing test, and solving the deformation problem caused by the uneven force applied to the exhaust manifold connecting flange during the sealing test.

[0017] Secondly, the device utilizes air pressure difference to drive the piston body to move up and down, realizes the compression force control of the exhaust manifold connecting flange, reduces the dependence of the traditional exhaust pipe component air pressure sealing test on the skill level of the operator, and solves the problems of low work efficiency and poor detection effect caused by manual clamping due to human factors from the source.

[0018] Thirdly, the device can be flexibly adjusted in design size according to the size specifications of different exhaust pipe components, meets the air pressure sealing test requirements of different exhaust pipe components, and has universality.

[0019] Fourthly, the air inlet unit includes a pressure test air interface and a fixed sealing structure, which is used for inflating the pressure test workpiece and plugging the connecting pipe opening, and is convenient to maintain.

[0020] Fifthly, the first air communication pipe and the second air communication pipe are welded by stainless steel pipes and annular pipe joints, and the tail end is connected with a manual gas distribution valve by using a curved pipe fitting, which avoids the hidden dangers of gas leakage and water immersion aging of the hose connection, and improves the service life and use reliability of the sealing pressure test device.

[0021] Sixthly, the device further includes a turnover support shaft and a turnover handle, and the operator can make the pressure test exhaust pipe component immersed in the water tank by lifting the turnover handle, so as to achieve the purpose of convenient and reliable pressure test. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described in the following description only relate to some embodiments of the present application, and are not a limitation on the present application.

[0023] Figure 1 It is a structural schematic diagram of the exhaust pipe in the background art;

[0024] Figure 2 It is a structural schematic diagram of the engine exhaust pipe sealing test device provided by the present embodiment and the connection of the exhaust pipe;

[0025] Figure 3 It is Figure 2 a top view;

[0026] Figure 4 a is the bottom view of the support body in Figure 2 ;

[0027] Figure 4 b is the front view of the support body in Figure 2 ;

[0028] Figure 4 c is the top view of the support body in Figure 2 ;

[0029] Figure 5 is a sectional view of the cylinder block in Figure 2 ;

[0030] Figure 6 a is a sectional view of the cylinder block in Figure 2 ;

[0031] Figure 6 b is a plan view of the cylinder block in Figure 2 ;

[0032] Figure 7 is a sectional view of the piston body in Figure 2 ;

[0033] Figure 8 a is a plan view of the top plate in Figure 2 ;

[0034] Figure 8 b is a sectional view of the top plate in Figure 2 . DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0036] Unless otherwise defined, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", and similar terms as used herein do not denote any order, quantity, or importance, but are used to distinguish one element from another, and the terms "one" or "the" does not denote the quantity by limiting it to only one. The terminology used herein should not be interpreted to imply any particular intended application or use.

[0037] Example 1

[0038] Reference is made to Figures 1 to 8The embodiment provides an engine exhaust pipe sealing test device, which comprises a support body 21, a first air communication pipe 22, a second air communication pipe 23 and a plurality of sealing locking units 24. A plurality of first through holes 213 are arranged between the upper surface 211 and the bottom surface 212 of the support body 21. Each sealing locking unit 24 comprises a cylinder body 241, a piston body 242, a top plate 243 and a rubber plate 244. The cylinder body 241 is fixedly installed on the bottom surface 212 of the support body. The first end 2421 of the piston body 242 is slidingly installed in the cylinder body 241, and the second end 2422 protrudes from the upper surface 211 of the support body 21 through the first through hole 213. The second end 2422 forms a first closed chamber together with the cylinder body 241 and the support body 21, and the first end 2421 forms a second closed chamber together with the cylinder body 241. The top plate 243 is fixedly installed on the second end 2422 of the piston body. The rubber plate 244 is arranged between the exhaust manifold connecting flange 13 and the top plate 243. The first air communication pipe 22 is in communication with the first closed chamber, and the second air communication pipe 23 is in communication with the second closed chamber.

[0039] The support body 21 is a main support member of the sealing locking unit 24. The upper surface 211 and the bottom surface 212 of the support body are precisely provided with the first through hole 213 by a CNC machine tool.

[0040] The cylinder body 241 is embeddedly installed on the bottom surface of the support body 21 and is fastened by a compression bolt. A rubber sealing gasket is assembled on a bonding surface, so that the sealing property of the connection between the cylinder body 241 and the support body 21 is ensured.

[0041] The piston body 242 is a moving part of the entire sealing test device. The piston body 242 is lifted and lowered in the cylinder body 241 by using the pressure difference between the upper and lower two layers of air pressure, so that the purpose of quickly clamping and sealing the workpiece for pressure test and quickly disassembling and replacing the workpiece after the pressure test is completed is achieved. Specifically, the piston body 242 is integrally formed by CNC precision machining. The top of the protruding second end 2422 is designed in a semispherical shape. The first end 2421 is provided with an O-shaped sealing ring installation groove 2423 by selecting a suitable O-shaped sealing ring and a suitable assembly gap for slide sealing. The O-shaped sealing ring installation groove 2423 is used to form the first closed chamber between the side surface of the first end 2421 of the piston body and the inner side surface of the cylinder body 241. The upper surface of the first end 2421 of the piston body, the inner side surface of the cylinder body 241, the bottom surface 212 of the support body and the side surface of the second end 2422 of the piston body form the second closed chamber. The first air communication pipe 22 provides power for the lifting of the piston body 242 after being ventilated. The second air communication pipe 23 provides power for the lowering of the piston body 242 after being ventilated.

[0042] The upper surface of the top plate 243 can be machined with a raised annular sealing band 2432 according to the outer dimensions of the exhaust manifold connecting flange, the upper end of the sealing band 2432 is covered with a rubber plate 244, the rubber plate 244 is a thin layer of elastic rubber plate, the annular sealing band 2432 is beneficial to improve the reliability of the sealing of the pressure testing workpiece. The lower surface of the top plate is machined into a smooth concave spherical surface 2431, which cooperates with the top of the second end 2422 of the piston body, the center of the hemispherical top 2422 is provided with a threaded hole 2433, and the top plate 243 is fixedly installed with the piston body 242 through screws. The installed top plate 243 can freely sway in a small range under stress. This design can ensure that the exhaust manifold connecting flange 13 of the pressure testing workpiece is not in the same plane, and the top plate 243 can automatically align and fit the plane of the exhaust manifold connecting flange 13 of the pressure testing workpiece after the cylinder is vented and rises, further improving the stability and reliability of the sealing of the pressure testing workpiece.

[0043] The use method of the test device is:

[0044] Before the operator performs the air pressure sealing test and detection on the exhaust pipe component, a plugging device matched with the shape and size of the pressure testing exhaust main pipe connecting flange 14 is selected, the exhaust manifold is placed on the rubber plate 244, the first air communication pipe 22 is closed, the second air communication pipe 23 is connected with the external power compressed air, the power compressed air enters the second closed chamber through the second air communication pipe 23, because the second closed chamber has external air input and the first closed chamber has no external air input, the air pressure in the second closed chamber is greater than that in the first closed chamber, the pressure difference between the upper and lower sides of the piston body 242 pushes the piston body 242 to drive the top plate 243 to rise, so that the rubber plate 244 is tightly fitted with the exhaust manifold connecting flange 13. During the pressure testing process, the pressure tested exhaust pipe workpiece is immersed in water to observe whether there is gas leakage.

[0045] After the sealing test of the exhaust pipe component is completed, the second air communication pipe 23 is closed, the first air communication pipe 22 is connected with the external power compressed air, the power compressed air enters the first closed chamber through the first air communication pipe 22, because the first closed chamber has external air input and the second closed chamber has no external air input, the air pressure in the first closed chamber is greater than that in the second closed chamber, the pressure difference between the upper and lower sides of the piston body 242 pushes the piston body 242 to drive the top plate 243 to descend, and the pressure tested exhaust pipe is quickly disassembled.

[0046] It should be noted that the cylinder can be closed under normal circumstances.

[0047] Compared with the prior art, first, the device utilizes the principle that the same force is applied to each exhaust manifold connecting flange 13 of the exhaust pipe component by each top plate 243 after the venting of the serial cylinder block 241, thereby ensuring that the force applied to each exhaust manifold connecting flange 13 of the exhaust pipe component is uniform during the sealing test, and solving the problem of deformation caused by uneven force applied to the exhaust manifold connecting flange 13 during the sealing test.

[0048] Second, the device utilizes the air pressure difference to drive the piston body 242 to move up and down, thereby realizing the control of the pressing force on the exhaust manifold connecting flange 13, reducing the dependence of the traditional air pressure sealing test of the exhaust pipe component on the skill level of the operator, and solving the problems of low work efficiency and poor detection effect caused by manual clamping due to human factors from the source.

[0049] Third, the device can be flexibly adjusted in design size according to the size specifications of different exhaust pipe components, thereby meeting the air pressure sealing test requirements of different exhaust pipe components, and having universality.

[0050] As a further embodiment, the device further comprises a manual air distribution valve 25 and a power air interface 26, one end of the manual air distribution valve 25 is connected to the power air interface 26, the other end is selectively connected to the first air communication pipe 22 or the second air communication pipe 23, and the manual air distribution valve 25 is responsible for controlling the flow direction of the compressed air, so that the compressed air enters the cylinder block 241 through different air communication pipes to generate a pressure difference on both sides of the piston body 242, thereby achieving the purpose of controlling the synchronous lifting of the top plate 243. Specifically, the spherical handle of the manual air distribution valve 25 is rotated to a position, and the compressed air is introduced into the first sealed chamber through the first air communication pipe 22; the spherical handle of the manual air distribution valve 25 is rotated to another position, and the compressed air is introduced into the second sealed chamber through the second air communication pipe, which is convenient to operate.

[0051] As a further embodiment, the device further comprises an air inlet unit, the air inlet unit comprises a test pressure air interface 27 and a fixed sealing structure 28, the test pressure air interface 27 is in communication with the exhaust main pipe 11, and the fixed sealing structure 28 seals and connects the test pressure air interface 27 and the exhaust main pipe connecting flange 14, is used for inflating the test workpiece and plugging the connecting pipe opening, and is convenient to maintain. Among them, the fixed sealing structure 28 is preferably an inflation sealing plug in the prior art, a sealing diaphragm is formed between the surfaces in contact with each other, the sealing membrane is tightly attached to the sealing surface under the action of the gas pressure by the introduction of compressed air into the sealed space, and the pressure difference between the high-pressure side and the low-pressure side is used to prevent gas leakage.

[0052] As a further embodiment, a second through hole 214 is provided between the side surface of the support body 21 and the bottom surface 212, the second through hole 214 is in communication with the first sealed chamber, and the first air communication pipe 22 is in communication with the first sealed chamber through the second through hole 214. Specifically, the second through hole 214 includes a horizontal section and a vertical section, the horizontal section is connected with the side surface of the support body 21, and the vertical section is connected with the bottom surface 212 of the support body. The horizontal section of the second through hole 214 is a threaded hole, and the first air communication pipe 22 is connected with the second through hole 214 through a hollow bolt.

[0053] As a further embodiment, a third through hole 2411 is provided at the bottom of the cylinder body 241, the third through hole 2411 is in communication with the second sealed chamber, and the second air communication pipe 23 is in communication with the first sealed chamber through the third through hole 2411. Specifically, the third through hole 2411 is a threaded hole, and the second air communication pipe 23 is connected with the third through hole 2411 through a hollow bolt.

[0054] As a further embodiment, the sealing and locking unit further includes an O-shaped sealing ring, a mounting groove 215 is provided on the side wall of the first through hole 213, and the O-shaped sealing ring is mounted in the mounting groove 215 to achieve sliding sealing cooperation between the second end 2422 of the piston body and the support body 21.

[0055] As a further embodiment, a stepped protrusion is provided at the bottom of the cylinder body 241 to avoid adhesion and jamming between the bottom surface of the cylinder body 241 and the piston body 242 after long-term placement. The third through hole 2411 is arranged in the stepped recessed area.

[0056] As a further embodiment, the first air communication pipe 22 and the second air communication pipe 23 are rigid pipes. The first air communication pipe 22 and the second air communication pipe 23 are welded by using a stainless steel pipe and an annular pipe joint, and the tail end is connected with the manual gas distribution valve 25 by using a curved pipe fitting. The gas leakage and water immersion aging hazards of the hose connection are avoided, and the service life and use reliability of the sealing and pressure testing device are improved.

[0057] As a further embodiment, the sealing and locking unit 24 further includes a stop bolt 245, the stop bolt 245 is fixedly installed on the upper surface 211 of the support body, the limiting part of the stop bolt 245 is connected with the upper surface of the exhaust manifold connection flange 13, and the stop bolt 245 is used to lock the movement of the exhaust manifold connection flange 13 and the upper surface 211 of the support body.

[0058] As a further implementation, the device further comprises a turnover support shaft 29 fixed at both ends of the support body 21. The turnover support shaft 29 is a welded assembly, and is connected to the narrow side of the support body 21 by bolts, so that the entire exhaust pipe sealing test device is supported in the water tank, the gravity center of the turnover support shaft 29 is lowered, and the stability of the entire exhaust pipe sealing test device in the water tank is ensured. Preferably, the device further comprises a turnover handle 30 installed on the upper surface 211 of the support body. An operator can immerse the pressure-tested exhaust pipe component into the water tank by lifting the turnover handle 30, so as to achieve the purpose of convenient and reliable pressure testing.

[0059] The device has been practically verified, and the operation convenience and detection reliability of the exhaust pipe sealing test are improved.

[0060] The above description is only exemplary implementation of the present application, and is not intended to limit the protection scope of the present application, which is defined by the appended claims.

Claims

1. An engine exhaust pipe tightness testing device characterized by comprising: The support body, the first air communication pipe, the second air communication pipe, the plurality of sealing lockout units, the plurality of first through holes between the upper surface and the bottom surface of the support body; each sealing lockout unit includes a cylinder body, a piston body, a top plate and a rubber plate, the cylinder body is fixedly installed on the bottom surface of the support body; the first end of the piston body is slidably installed in the cylinder body, the second end protrudes from the upper surface of the support body through the first through hole, the second end forms a first sealed chamber with the cylinder body and the support body, and the first end forms a second sealed chamber with the cylinder body; the top plate is fixedly installed on the second end of the piston body; the rubber plate is arranged between the exhaust manifold connecting flange and the top plate; wherein the first air communication pipe communicates with the first sealed chamber, and the second air communication pipe communicates with the second sealed chamber.

2. The engine exhaust pipe tightness testing device according to claim 1, characterized by, It also includes a manual air distribution valve and a power air interface, one end of the manual air distribution valve is connected with the power air interface, and the other end is selectively connected with the first air communication pipe or the second air communication pipe.

3. The engine exhaust pipe tightness testing device according to claim 1, characterized by, It also includes an air inlet unit, the air inlet unit includes a pressure test air interface and a fixed sealing structure, the pressure test air interface communicates with the exhaust main pipe, and the fixed sealing structure seals and connects the pressure test air interface and the exhaust main pipe connecting flange.

4. The engine exhaust pipe tightness testing device according to claim 1, characterized by, The second through hole is provided between the side surface and the bottom surface of the support body, the second through hole communicates with the first sealed chamber, and the first air communication pipe communicates with the first sealed chamber through the second through hole.

5. The engine exhaust pipe tightness testing device according to claim 1, wherein The third through hole is provided at the bottom of the cylinder body, the third through hole communicates with the second sealed chamber, and the second air communication pipe communicates with the first sealed chamber through the third through hole.

6. The engine exhaust pipe tightness testing device according to claim 1, wherein The sealing lockout unit further includes an O-shaped sealing ring, the first through hole side wall is provided with a mounting groove, and the O-shaped sealing ring is mounted in the mounting groove to achieve sliding sealing cooperation between the second end of the piston body and the support body.

7. The engine exhaust pipe tightness testing device according to claim 1, wherein The bottom of the cylinder body is provided with a stepped protrusion.

8. The engine exhaust pipe tightness testing device according to claim 1, wherein The first air communication pipe and the second air communication pipe are rigid pipes.

9. The engine exhaust pipe tightness testing device according to claim 1, wherein The sealing lockout unit further includes a stop bolt, the stop bolt is fixedly installed on the upper surface of the support body, and is used for locking the movement of the exhaust manifold connecting flange and the upper surface of the support body.

10. The engine exhaust pipe tightness testing device according to claim 1, characterized by, It also includes a turnover support shaft, the turnover support shaft is fixed at both ends of the support body.

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