High-speed diesel engine cylinder head sealing performance test tooling device and test method

Abstract

The present invention provides a high-speed diesel engine cylinder head sealing performance test tooling device and a test method. The device includes: an intake air support bottom plate, fasteners, and a sealing assembly; the intake air support bottom plate is fastened to the cylinder head through the fasteners; the sealing assembly seals the cylinder head. The method includes: installing the device on the cylinder head to be inspected, connecting the cavity to a compressed air pipeline, immersing it in a hot water pool so that the temperature of the cylinder head reaches a set temperature; sequentially opening each compressed air pipeline and introducing air at a certain pressure, observing whether bubbles emerge from the cylinder head in the water, and thereby judging whether the cavity sealing performance of the cylinder head meets the requirements. The device of the present invention has a simple structure, few cooperating components, convenient processing, and easy use. The method is practical, effective, simple to operate, and has clear and reasonable criteria, and can also be applied to the sealing performance test of cylinder heads of other models of diesel engines.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed diesel engines, and particularly to a sealing test tooling device and a test method for a cylinder head of a high-speed diesel engine. Background Art

[0002] The cylinder head of a high-speed diesel engine has a complex structure and undertakes multiple tasks. Firstly, it seals the lower plane of the cylinder and forms a combustion chamber with the piston and cylinder liner. Secondly, it provides installation positions for many components, such as intake and exhaust valves and their transmission mechanisms, fuel injectors, starting valves, pressure reducing valves, etc. Inside the cylinder head of a high-speed diesel engine, there are also intake and exhaust air passages, a cooling water cavity, and a lubricating oil passage.

[0003] Since the cylinder head of a high-speed diesel engine bears a large gas pressure and thermal stress during operation, at the same time, the pre-tightening force of the cylinder head bolts causes the cylinder head to be subjected to compressive stress, and together with the gas, the cylinder head is subjected to bending; the temperature distribution of the cylinder head is uneven, generating additional thermal stress, and coupled with the complex structural shape, the stress distribution is uneven. Therefore, the material and structural dimensions of the cylinder head should ensure its sufficient sealing performance and reliable cooling. Therefore, it is very necessary to effectively test the sealing performance of the cylinder head.

[0004] After retrieval, it is found that:

[0005] The Chinese utility model patent "Leakage Test Tooling for Cylinder Head" with the publication number CN202735034U includes a bottom plate, on which there are at least one bottom water hole sealing gasket, at least one air inlet joint, and at least one clamping head support. At least one clamping head is provided on the clamping head support, where: the bottom water hole sealing gasket is used to seal the bottom water hole of the cylinder head, the air inlet joint is used to supply air into the cylinder head during leakage testing, and the clamping head is used to fasten the cylinder head. The present utility model adopts an integral frame, and small sealing gaskets are used to replace the original whole sealing gasket at the leakage testing positions corresponding to the cylinder head on the frame, which can prevent the introduction of interference errors during the leakage testing process, is convenient to operate, and will not damage the thread. This tooling has the following technical problems: the positioning support, sealing gasket support, and positioning pins protruding on the bottom plate need to be very careful during the seating process of the cylinder head bottom surface. If the sealing hole alignment operation is improper, the protruding design is likely to scratch the machined surface of the cylinder head and cause damage to the cylinder head. Moreover, for a cylinder head with more bottom cavity holes, more protrusions will be required, and too many protrusions will cause difficulties in accurately aligning and stably installing the cylinder head holes with the protruding gaskets and holes; in addition, for the sealing gasket designed on the protruding support, it is not specified whether the protruding sealing gasket is inserted into the cylinder head hole or covers the cylinder head hole. In summary, this design is suitable for cylinder heads with small volume, light weight, and fewer bottom holes, and has poor applicability for cylinder heads with larger volume, weight, and more bottom and top cavity holes. The bottom hole sealing and positioning operation requirements are more complex, and the convex platform design makes it easy for the cylinder head to be unstable when placed.

[0006] The Chinese utility model patent "Leakage Testing Tooling for Engine Cylinder Head Over-Pin Holes" with the publication number CN207280693U includes a leakage testing bottom plate, on the upper surface of which a sealing glue is provided. The leakage testing bottom plate is used to seal the bottom of the engine cylinder head; and a screw rod, which is arranged through the leakage testing bottom plate. The head of the screw rod has a threaded section, and an axial slot is provided on the threaded section. During leakage testing, after the over-pin hole of the engine cylinder head passes through the screw rod, it is locked by a nut, and the slot is used to discharge the gas in the over-pin hole. This leakage testing tooling effectively avoids the occurrence of wrong or missed parts. However, this tooling has the following technical problems: The fastening and sealing method of welding the screw rod to the bottom plate after passing through the bottom plate makes the installation operation of the tooling complex, the universality poor, and the test cost increase.

[0007] Currently, no description or report of similar technologies to the present invention has been found, nor have similar materials at home and abroad been collected. Summary of the Invention

[0008] In view of the above deficiencies in the prior art, the present invention provides a sealing performance testing tooling device and testing method for a high-speed diesel engine cylinder head.

[0009] According to one aspect of the present invention, there is provided a sealing performance testing tooling device for a high-speed diesel engine cylinder head, including: an intake support bottom plate, fasteners, and a sealing assembly; the intake support bottom plate is fastened to the cylinder head through the fasteners; the sealing assembly seals the cylinder head;

[0010] Wherein:

[0011] The fasteners include: stud bolts, nuts, and fastening washers. The intake support bottom plate is fastened to the bottom surface of the cylinder head through the stud bolts, nuts, and fastening washers;

[0012] The sealing assembly includes:

[0013] The first group of sealing assemblies, the first group of sealing assemblies includes: a sealing block (13), a first bolt (11), a first washer, and a sealing gasket. The sealing block is sealed at the outlet position of the lubricating oil cavity on the upper surface of the cylinder head through the first bolt, the first washer, and the sealing gasket;

[0014] The second group of sealing assemblies, the second group of sealing assemblies includes: a triangular sealing block, a second bolt, a second washer, and a triangular sealing plate. The triangular sealing block is sealed at the water outlet hole position on the upper surface of the cylinder head through the second bolt, the second washer, and the triangular sealing plate;

[0015] The third group of sealing assemblies, the third group of sealing assemblies includes: a first plug and a third washer. The first plug and the third washer are sealed at the starting valve mounting hole position on the upper surface of the cylinder head;

[0016] The fourth set of sealing components, the fourth set of sealing components includes: a second plug and a first sealing ring, the second plug and the first sealing ring are sealed at the position of the pressure reducing valve mounting hole on the upper surface of the cylinder head;

[0017] The fifth set of sealing components, the fifth set of sealing components includes: a sealing groove and a second sealing ring arranged inside the sealing groove, the sealing groove and the second sealing ring are sealed at the air port position between the cylinder head and the intake support bottom plate;

[0018] The sixth set of sealing components, the sixth set of sealing components includes: a plurality of third sealing rings, and the plurality of third sealing rings are sealed at the cavity port position between the cylinder head and the intake support bottom plate.

[0019] Optionally, the intake support bottom plate is integrally rectangular in structure, and has surface holes thereon, the relative positions and dimensions of the surface holes are adapted to the structural dimensions of the cylinder head; there are circular holes on the intake support bottom plate; wherein:

[0020] The surface holes include: air port b1, air port b2, air port c1, air port c3 and a ring groove;

[0021] Four intake interfaces are installed on three sides of the intake support bottom plate, and the intake interfaces are used to connect with the quick connectors of the compressed air pipes; the four intake interfaces are respectively communicated with the air port b1, the air port b2, the air port c1 and the air port c3 through an inner cavity channel arranged inside the intake support bottom plate; the air ports are connected to the corresponding cavity ports on the bottom surface of the cylinder head, and are sealed through the corresponding fifth set of sealing components; wherein, the air port b1 cooperates with the starting valve hole cavity of the cylinder head, and the air port b2 cooperates with the pressure reducing valve hole cavity of the cylinder head;

[0022] The ring groove is adapted to the position of the cavity port on the bottom surface of the cylinder head, and seals the cavity port on the bottom surface of the cylinder head through the sixth set of sealing components.

[0023] Optionally, the length × width × thickness dimensions of the intake support bottom plate are: 458 × 344 × 25 mm;

[0024] The center position of the circular hole is 172 mm away from both long sides of the intake support bottom plate; the center position of the circular hole is 192 mm and 266 mm away from both short sides of the intake support bottom plate respectively;

[0025] The diameter of the circular hole is 130 mm.

[0026] Optionally, a groove for water flow is provided at the head of the screw of the stud.

[0027] Optionally, the thread specification of the stud is: M24×350.

[0028] Optionally, the size of the length × width × depth of the groove is: 150×4×4 mm.

[0029] Optionally, the triangular sealing block and the triangular sealing plate are of a matching isosceles triangle structure, and a through hole is provided at each of the three vertex positions of the isosceles triangle structure, and the second bolt and the second gasket are arranged at the through holes.

[0030] Optionally, the length between the centers of the two through holes located at the bottom edge on the triangular sealing block and the triangular sealing plate is 60 mm, and the lengths between the centers of the two through holes located on the opposite sides are 55.8 mm respectively.

[0031] Optionally, the diameter of the through hole is: 10 mm; the thread specification of the second bolt is: M10×30.

[0032] Optionally, the sealing block and the gasket are of a matching rectangular structure, and an installation hole is provided on each of the two short sides of the rectangular structure, and the first bolt and the first gasket are arranged at the installation holes.

[0033] Optionally, the length of the sealing block and the gasket is 128 mm and the width is 30 mm; the diameters of the two installation holes are 16 mm; wherein, the distance from the center position of one installation hole to the adjacent long side is 11 mm and the distance to the adjacent short side is 14 mm, and the distance from the center position of the other installation hole to the adjacent long side is 13 mm and the distance to the adjacent short side is 14 mm.

[0034] Optionally, the thread specification of the first plug is M35.

[0035] Optionally, the thread specification of the second plug is M24.

[0036] According to another aspect of the present invention, there is provided a high-speed diesel engine cylinder head sealing performance test method implemented based on the test tooling device described in any one of the above, including:

[0037] Install the test tooling device on the cylinder head to be inspected, connect the cavity of the cylinder head to the compressed air pipeline, and immerse it in a heat-insulating hot water pool at a set temperature for m minutes so that the temperature of the cylinder head reaches the set temperature;

[0038] Open each compressed air pipeline in sequence and introduce air at a certain pressure for n minutes, observe whether bubbles emerge from the cylinder head in the water, and then judge whether the cavity sealing performance of the cylinder head meets the requirements.

[0039] Optionally, the set temperature is 80 + 5 °C.

[0040] Optionally, the value of m ranges from 10 to 15.

[0041] Optionally, the value of n ranges from 5 to 10.

[0042] Optionally, the pressure of the inlet air is 1 - 2 bar.

[0043] Due to the adoption of the above technical solution, compared with the prior art, the present invention has at least one of the following beneficial effects:

[0044] The present invention can be used to implement the test and detection of the airtightness of the cylinder head of a high-speed diesel engine, and thus it is easy to discover defects such as cracks that affect the sealing performance.

[0045] The present invention can achieve the purpose of inspecting different cavities in the cylinder head by switching the air inlet of different quick connectors of the compressed air pipe through the air inlet interface provided on the air inlet support bottom plate.

[0046] The present invention provides circular holes on the air inlet support bottom plate, which reduces the mass of the test tooling and can effectively avoid the influence on the sealing performance determination caused by confining air in the contact gap when the bottom plate seals the ground plane of the cylinder head.

[0047] The present invention provides an opening groove on the fastening bolt to allow water to smoothly enter the cylinder head bolt hole, eliminating the influence on the sealing performance determination caused by the air remaining in the hole after the bolt is tightened.

[0048] The present invention has a simple structure, few cooperating components, is convenient for processing, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent:

[0050] Figure 1 It is a structural assembly drawing of the airtightness test tooling device for the cylinder head of a high-speed diesel engine in an embodiment of the present invention.

[0051] Figure 2 It is a schematic structural diagram of the air inlet support bottom plate of the test tooling device in a preferred embodiment of the present invention.

[0052] Figure 3 It is a schematic structural diagram of the fastening stud of the test tooling device in a preferred embodiment of the present invention; wherein, (a) is a schematic diagram from one perspective, and (b) is a schematic diagram from another perspective.

[0053] Figure 4Schematic diagram of the triangular sealing plate structure of the test tooling device in a preferred embodiment of the present invention; among them, (a) is a schematic diagram from one perspective, and (b) is a schematic diagram from another perspective.

[0054] Figure 5 Schematic diagram of the strip-shaped sealing plate structure of the test tooling device in a preferred embodiment of the present invention; among them, (a) is a schematic diagram from one perspective, and (b) is a schematic diagram from another perspective.

[0055] In the figure: 1 is the intake air support bottom plate, 2 is the fastening stud, 3 is the rubber sealing gasket for the water outlet, 4 is the water outlet sealing plate, 5 is the second gasket, 6 is the second bolt, 7 is the fastening gasket, 8 is the nut, 9 is the first plug, 10 is the third gasket, 11 is the first bolt, 12 is the first gasket, 13 is the sealing block, 14 is the rubber sealing gasket (sealing pad), 15 is the sealing ring a, 16 is the sealing ring b, 17 is the sealing ring c, 18 is the second plug, 19 is the first sealing ring, 20 is the test cylinder head, and 21 is the intake air interface. Detailed implementation manners

[0056] The embodiments of the present invention will be described in detail below: These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

[0057] Figure 1 Structural assembly drawing of the high-speed diesel engine cylinder head sealing test tooling device provided by an embodiment of the present invention.

[0058] As Figure 1 shown, the high-speed diesel engine cylinder head sealing test tooling device provided by this embodiment includes: an intake air support bottom plate 1, fasteners, and a sealing assembly; the intake air support bottom plate 1 is fastened to the cylinder head 20 through fasteners; the sealing assembly seals the cylinder head 20.

[0059] Among them:

[0060] The fasteners include: a stud 2, a nut 8, and a fastening gasket 7, and the intake air support bottom plate 1 is fastened to the bottom surface of the cylinder head through the stud 2, the nut 8, and the fastening gasket 7.

[0061] The sealing assembly includes:

[0062] The first group of sealing assemblies, and the first group of sealing assemblies includes: a sealing block (13), a first bolt (11), a first gasket 12, and a sealing pad 14. The sealing block 13 is sealed at the position of the lubricating oil chamber outlet on the upper surface of the cylinder head 20 through the first bolt 11, the first gasket 12, and the sealing pad 14.

[0063] The second set of sealing components, the second set of sealing components includes: a triangular sealing block 4, a second bolt 6, a second gasket 5 and a triangular sealing plate. The triangular sealing block 4 is sealed at the position of the water outlet hole on the upper surface of the cylinder head 20 through the second bolt 6, the second gasket 5 and the triangular sealing plate;

[0064] The third set of sealing components, the third set of sealing components includes: a first plug 9 and a third gasket 10. The first plug 9 and the third gasket 10 are sealed at the position of the starting valve mounting hole on the upper surface of the cylinder head 20;

[0065] The fourth set of sealing components, the fourth set of sealing components includes: a second plug 18 and a first sealing ring 19. The second plug 18 and the first sealing ring 19 are sealed at the position of the pressure reducing valve mounting hole on the upper surface of the cylinder head 20;

[0066] The fifth set of sealing components, the fifth set of sealing components includes: a sealing groove and a second sealing ring arranged inside the sealing groove. The sealing groove and the second sealing ring are sealed at the air port position between the cylinder head 20 and the intake support bottom plate 1;

[0067] The sixth set of sealing components, the sixth set of sealing components includes: a plurality of third sealing rings. The plurality of third sealing rings are sealed at the cavity port position between the cylinder head 20 and the intake support bottom plate 1.

[0068] In a preferred embodiment of this embodiment, the intake support bottom plate 1 is integrally rectangular in structure, and has surface holes on it. The relative positions and sizes of the surface holes are adapted to the structural dimensions of the cylinder head 20; there are circular holes on the intake support bottom plate 1; where:

[0069] The surface holes include: air ports b1, b2, c1, c3 and a ring groove;

[0070] A total of four intake connectors 21 are installed on three sides of the intake support bottom plate 1. The intake connectors 21 are used to connect with the quick connectors of the compressed air pipes; the four intake connectors 21 are respectively communicated with the air ports b1, b2, c1 and c3 through the inner cavity channels arranged inside the intake support bottom plate 1; the air ports are connected to the corresponding cavity ports on the bottom surface of the cylinder head 20 and are sealed through the corresponding fifth set of sealing components; among them, the air port b1 cooperates with the starting valve hole cavity of the cylinder head 20, and the air port b2 cooperates with the pressure reducing valve hole cavity of the cylinder head 20;

[0071] The ring groove is adapted to the position of the cavity port on the bottom surface of the cylinder head 20, and seals the cavity port on the bottom surface of the cylinder head 20 through the sixth set of sealing components.

[0072] In a preferred embodiment of this embodiment, the length × width × thickness dimensions of the intake support bottom plate 1 are: 458 × 344 × 25 mm;

[0073] The distance from the center position of the circular hole to the two long sides of the intake support bottom plate 1 is 172 mm; the distances from the center position of the circular hole to the two short sides of the intake support bottom plate 1 are 192 mm and 266 mm respectively;

[0074] The diameter of the circular hole is 130 mm.

[0075] In a preferred embodiment of this embodiment, a groove for water flow is provided at the screw head of the stud 2.

[0076] In a preferred embodiment of this embodiment, the thread specification of the stud 2 is: M24×350.

[0077] In a preferred embodiment of this embodiment, the size of the groove in terms of length × width × depth is: 150×4×4 mm.

[0078] In a preferred embodiment of this embodiment, the triangular sealing block 4 and the triangular sealing plate are of a matching isosceles triangular structure, and a through hole is provided at each of the three vertex positions of the isosceles triangular structure. The second bolt 6 and the second gasket 5 are arranged at the through holes.

[0079] In a preferred embodiment of this embodiment, the length between the center positions of the two through holes on the bottom side of the triangular sealing block 4 and the triangular sealing plate is 60 mm, and the lengths between the center positions of the two through holes on the opposite side are 55.8 mm respectively.

[0080] In a preferred embodiment of this embodiment, the diameter of the through hole is: 10 mm; the thread specification of the second bolt 6 is: M10×30.

[0081] In a preferred embodiment of this embodiment, the sealing block 13 and the sealing gasket 14 are of a matching rectangular structure, and an installation hole is provided on each of the two short side edges of the rectangular structure. The first bolt 11 and the first gasket 12 are arranged at the installation holes.

[0082] In a preferred embodiment of this embodiment, the length of the sealing block 13 and the sealing gasket 14 is 128 mm and the width is 30 mm; the diameter of the two installation holes is 16 mm; among them, the distance from the center position of one installation hole to the adjacent long side is 11 mm and the distance to the adjacent short side is 14 mm, and the distance from the center position of the other installation hole to the adjacent long side is 13 mm and the distance to the adjacent short side is 14 mm.

[0083] In a preferred embodiment of this embodiment, the thread specification of the first plug 9 is M35.

[0084] In a preferred embodiment of this embodiment, the thread specification of the second plug 18 is M24.

[0085] An embodiment of the present invention further provides a method for testing the airtightness of a high-speed diesel engine cylinder head, which is implemented based on the test tooling device in any of the above embodiments of the present invention.

[0086] The test method provided by this embodiment may include the following steps:

[0087] S100, Install the test tooling device on the cylinder head to be inspected, connect the cavity of the cylinder head to the compressed air pipeline, and immerse it in a heat-insulating hot water pool at a set temperature for m minutes so that the temperature of the cylinder head reaches the set temperature;

[0088] S200, Open each compressed air pipeline in turn, introduce air at a certain pressure for n minutes, observe whether bubbles emerge from the cylinder head in the water, and then judge whether the airtightness of the cavity of the cylinder head meets the requirements.

[0089] In a specific application example of S100, the set temperature is 80 + 5 °C.

[0090] In a specific application example of S100, m ranges from 10 to 15.

[0091] In a specific application example of S200, n ranges from 5 to 10.

[0092] In a specific application example of S100, the pressure of the introduced air is 1 to 2 bar.

[0093] It should be noted that the steps in the method provided by the present invention can be implemented by corresponding components and devices in the system. Those skilled in the art can refer to the technical solution of the system to implement the step flow of the method. That is, the embodiments in the system can be understood as preferred examples for implementing the method, which will not be elaborated here.

[0094] The following further describes the technical solutions provided by the above embodiments of the present invention with reference to the accompanying drawings.

[0095] The purpose of the above embodiments of the present invention is to design a test tooling device for testing the airtightness of a high-speed diesel engine cylinder head. This device has the characteristics of simple operation, reliable use, high accuracy, etc. Through the test, it can be verified that the cylinder head can effectively meet the use requirements of the diesel engine.

[0096] As Figure 1As shown, the test fixture device provided by the above embodiment of the present invention includes an intake support base plate 1, fasteners and seals. Among them, the intake support base plate 1 is the basis for the sealing test. Among the fasteners and seals of the test fixture device: 4 studs 2, 4 nuts 8 and 4 fastening gaskets 7 are used to fasten the intake support base plate 1 to the cylinder head; the sealing block 13 seals the outlet of the lubricating oil cavity on the upper surface of the cylinder head through 2 first bolts 11, 2 first gaskets 12 and 1 sealing gasket 14; the triangular sealing block 4 seals the water outlet on the upper surface of the cylinder head through 3 second bolts 6, 3 second gaskets 5 and 1 triangular sealing plate; the first screw plug 9 and the third gasket 10 are used to seal the starting valve mounting hole on the cylinder head; the second screw plug 18 and the first sealing ring 19 are used to seal the pressure reducing valve mounting hole.

[0097] like Figure 2 As shown, the air intake support base plate 1 is specifically:

[0098] 1. The intake support bottom plate 1 is rectangular in shape. Its overall shape, relative position and size of the surface holes are designed according to the cylinder head dimensions: 458mm long, 344mm wide, and 25mm thick. A Φ130mm hole is opened at the position of 172mm / 172mm from the two long sides and 192mm / 266mm from the two short sides. This hole can prevent the plate from contacting and sealing with the bottom surface of the cylinder head, causing abnormal bubbling during the test and affecting the airtightness determination. The upper surface contacts and cooperates with the bottom surface of the cylinder head (cylinder explosion surface) during assembly.

[0099] 2. Four air intake interfaces 21 are installed on the three sides of the air intake support base plate 1, which can be connected to the compressed air pipe quick connector to achieve fast switching connection; the four interfaces are connected with the four air ports b1, b2, c1, and c3 on the upper surface of the corresponding base plate through the inner cavity of the base plate, and the four air ports are connected with the corresponding cavity ports on the bottom surface of the cylinder head, and are sealed through the corresponding sealing groove and its internal sealing ring (i.e., the fifth group of sealing components). Figure 2 Middle: a is an M24 screw hole.

[0100] 3. The intake support base plate 1 is designed with fastening bolt holes according to the position and size of the cylinder head fastening bolt holes, and the intake support base plate 1 is installed and fixed on the bottom plane of the cylinder head through the studs 2, nuts 8 and fastening gaskets 7. The air port b1 cooperates with the cylinder head starting valve hole cavity, and the air port b2 cooperates with the cylinder head pressure reducing valve hole cavity.

[0101] 4. The upper ring groove of the intake support base plate 1 is designed according to the position and size of the cavity opening on the bottom surface of the cylinder head. It seals the cavity opening on the bottom surface of the cylinder head through 7 sealing rings a15, 1 sealing ring b16 and 1 sealing ring c17 in the sixth group of sealing components.

[0102] like Figure 3As shown in (a) and (b), the thread specification of the stud 2 is M24×350, and a groove with a length of 150 mm, a width of 4 mm and a depth of 4 mm is opened at the head of the screw rod. The function of this groove is as follows: after the entire test tooling is assembled and placed in the water tank, water infiltrates into the cylinder head stud hole along this groove, avoiding the air being sealed in the cylinder head bolt hole after tightening the stud bolt, which may affect the judgment of the sealing test.

[0103] As Figure 4 As shown in (a) and (b), for the triangular sealing block 4 and the gasket 3, the key lies in the relative positions of the three Φ10 mm holes on the sealing block, that is, the centers of the three holes on the triangular sealing block 4 are at the three vertices of an equilateral triangle with a base of 60 mm and an opposite side of 55.8 mm, which can ensure that the M10×30 bolt 6 is installed through the screw hole at the cooling water outlet of the cylinder head to fasten the sealing block and seal the outlet.

[0104] As Figure 5 As shown in (a) and (b), for the sealing block 13 and the gasket 14, the key lies in the positions of the two Φ16 holes. The strip-shaped sealing block 13 is 128 mm long and 30 mm wide. The center of the left-lower Φ16 mm hole is 11 mm away from the adjacent long side and 14 mm away from the short side, and the center of the other upper-right Φ16 mm hole is 13 mm away from the adjacent long side and 14 mm away from the short side.

[0105] The thread of the plug 9 and the plug 18 is M35 and M24 respectively, which are used to seal the air holes on the top surface of the cylinder head.

[0106] The sealing test method implemented based on the test tooling device provided in the above embodiments of the present invention is specifically as follows:

[0107] Install the test tooling device on the inspection cylinder head. Connect the cavity to be inspected to the quick connector of the compressed air inlet at the corresponding interface on the bottom plate (such as the b1 port connector), connect the cavity to be inspected to the compressed air pipeline, immerse the entire test cylinder head in a thermostatic hot water bath at 80 + 5 °C and let it stand for about 10 minutes until the temperature of the cylinder head body reaches 80 + 5 °C (the temperature of the cylinder head body can be measured by a dot thermometer). Then open the compressed air pipeline to introduce air at a certain pressure (such as 1 bar) for 5 minutes, and observe whether bubbles will emerge from the cylinder head in the water. If no bubbles are generated during the ventilation process, the cavity has good sealing performance; if continuous bubbles emerge from a certain part of the cylinder head, the sealing performance of the detected cavity / cylinder head is poor; if a few bubbles emerge occasionally from a certain part but no bubbles are generated subsequently, the cavity has good sealing performance. After detecting that a certain cavity has good sealing performance, switch to connect the air inlet of the intake support bottom plate (such as c1), and detect another cavity in the same way. If continuous bubbles continuously appear, confirm the bubble outlet. The bubble outlet can be found by increasing the ventilation pressure (such as 4 bar). When it is confirmed that the bubbles do not come from the test tooling, it can be confirmed that the bubbles come from the cylinder head cavity, and the sealing performance of the cylinder head is poor and cannot meet the requirements for use in a diesel engine. By switching to connect all the air inlets of the intake support bottom plate to introduce compressed air at a certain pressure and maintaining it for a certain period of time, if no continuous bubbles continuously emerge during the whole process, it can be determined that the sealing performance of all the detected cavities is good, and further it shows that the sealing performance of the cylinder head is good.

[0108] The high-speed diesel engine cylinder head sealing performance test tooling device and test method provided in the above embodiments of the present invention have been proven to be effective in testing the sealing performance of the high-speed diesel engine cylinder head through multiple tests. Among them, the test tooling device has a simple structure, few mating parts, convenient processing, and easy use. The test method is practical, feasible, simple to operate, and has clear and reasonable criteria, and can also be applied to the sealing performance test of cylinder heads of other models of diesel engines.

[0109] Matters not described in detail in the above embodiments of the present invention are all well-known technologies in the art.

[0110] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A test tooling device for the airtightness of a high-speed diesel engine cylinder head, characterized in that, it includes: an intake support bottom plate (1), fasteners, and a sealing component; the intake support bottom plate (1) is fastened to the cylinder head (20) by the fasteners; the sealing component seals the cylinder head (20); wherein: the fasteners include: studs (2), nuts (8), and fastening washers (7), and the intake support bottom plate (1) is fastened to the bottom surface of the cylinder head by the studs (2), nuts (8), and fastening washers (7); the sealing component includes: the first group of sealing components, the first group of sealing components includes: a sealing block (13), a first bolt (11), a first washer (12), and a sealing gasket (14), and the sealing block (13) is sealed at the outlet position of the lubricating oil cavity on the upper surface of the cylinder head (20) by the first bolt (11), the first washer (12), and the sealing gasket (14); the second group of sealing components, the second group of sealing components includes: a triangular sealing block (4), a second bolt (6), a second washer (5), and a triangular sealing plate, and the triangular sealing block (4) is sealed at the water outlet hole position on the upper surface of the cylinder head (20) by the second bolt (6), the second washer (5), and the triangular sealing plate; the third group of sealing components, the third group of sealing components includes: a first plug (9) and a third washer (10), and the first plug (9) and the third washer (10) are sealed at the starting valve mounting hole position on the upper surface of the cylinder head (20); the fourth group of sealing components, the fourth group of sealing components includes: a second plug (18) and a first sealing ring (19), and the second plug (18) and the first sealing ring (19) are sealed at the pressure reducing valve mounting hole position on the upper surface of the cylinder head (20); the fifth group of sealing components, the fifth group of sealing components includes: a sealing groove and a second sealing ring arranged inside the sealing groove, and the sealing groove and the second sealing ring are sealed at the air port position between the cylinder head (20) and the intake support bottom plate (1); the sixth group of sealing components, the sixth group of sealing components includes: a plurality of third sealing rings, and the plurality of third sealing rings are sealed at the cavity port position between the cylinder head (20) and the intake support bottom plate (1); the intake support bottom plate (1) is integrally rectangular in structure, and has surface holes thereon, and the relative positions and dimensions of the surface holes are adapted to the structural dimensions of the cylinder head (20); circular holes are provided on the intake support bottom plate (1); wherein: the surface holes include: air ports b1, b2, c1, c3, and a ring groove; four intake interfaces (21) are installed on three sides of the intake support bottom plate (1), and the intake interfaces (21) are used to connect with the quick connectors of the compressed air pipes; the four intake interfaces (21) are respectively communicated with the air ports b1, b2, c1, and c3 through internal cavity channels provided inside the intake support bottom plate (1).

2. The airtightness test tooling device for the cylinder head of a high-speed diesel engine according to claim 1, characterized in that, the air ports are connected to the corresponding cavity ports on the bottom surface of the cylinder head (20), and are sealed by the corresponding fifth set of sealing components; wherein, the air port b1 is matched with the starting valve hole cavity of the cylinder head (20), and the air port b2 is matched with the pressure reducing valve hole cavity of the cylinder head (20); the annular groove is adapted to the position of the cavity port on the bottom surface of the cylinder head (20), and the cavity port on the bottom surface of the cylinder head (20) is sealed by the sixth set of sealing components.

3. The airtightness test tooling device for the cylinder head of a high-speed diesel engine according to claim 2, characterized in that, the length × width × thickness dimensions of the intake support bottom plate (1) are: 458 × 344 × 25 mm; the center position of the circular hole is 172 mm away from both long sides of the intake support bottom plate (1); the center position of the circular hole is 192 mm and 266 mm away from the two short sides of the intake support bottom plate (1) respectively; the diameter of the circular hole is 130 mm.

4. The airtightness test tooling device for the cylinder head of a high-speed diesel engine according to claim 1, characterized in that, a groove for water flow is provided at the head of the screw rod of the stud (2).

5. The airtightness test tooling device for the cylinder head of a high-speed diesel engine according to claim 1, characterized in that, the thread specification of the stud (2) is: M24 × 350; and / or the length × width × depth dimensions of the groove are: 150 × 4 × 4 mm.

6. The airtightness test tooling device for the cylinder head of a high-speed diesel engine according to claim 1, characterized in that, the triangular sealing block (4) and the triangular sealing plate are of a matching isosceles triangular structure, and a through hole is provided at each of the three vertex positions of the isosceles triangular structure, and the second bolt (6) and the second gasket (5) are arranged at the through holes.

7. The airtightness test tooling device for the cylinder head of a high-speed diesel engine according to claim 6, characterized in that, the length between the center positions of the two through holes on the bottom edge of the triangular sealing block (4) and the triangular sealing plate is 60 mm, and the lengths between the center positions of the two through holes on the opposite sides are 55.8 mm respectively; and / or the diameter of the through hole is: 10 mm; the thread specification of the second bolt (6) is: M10 × 30.

8. The airtightness test tooling device for the cylinder head of a high-speed diesel engine according to claim 1, characterized in that, the sealing block (13) and the gasket (14) are of a matching rectangular structure, and an installation hole is provided on each of the two short sides of the rectangular structure, and the first bolt (11) and the first gasket (12) are arranged at the installation holes.

9. The airtightness test tooling device for the cylinder head of a high-speed diesel engine according to claim 8, characterized in that, The length of the sealing block (13) and the sealing gasket (14) is 128 mm, and the width is 30 mm; the diameter of the two mounting holes is 16 mm; wherein, the distance from the center position of the hole of one mounting hole to the adjacent long side is 11 mm, and the distance to the adjacent short side is 14 mm, and the distance from the center position of the hole of the other mounting hole to the adjacent long side is 13 mm, and the distance to the adjacent short side is 14 mm.

10. The high-speed diesel engine cylinder head sealing performance test tooling device according to claim 1, characterized in that the thread specification of the first plug (9) is M35; and / or the thread specification of the second plug (18) is M24.

11. A high-speed diesel engine cylinder head sealing performance test method implemented based on the test tooling device according to any one of claims 1-10, characterized in that it includes: Install the test tooling device on the cylinder head to be inspected, connect the cavity of the cylinder head to the compressed air pipeline, and immerse it in a heat-insulating hot water pool at a set temperature for m minutes so that the temperature of the cylinder head reaches the set temperature; Open each compressed air pipeline in sequence and introduce air at a certain pressure for n minutes, observe whether bubbles emerge from the cylinder head in the water, and then judge whether the cavity sealing performance of the cylinder head meets the requirements.

12. The high-speed diesel engine cylinder head sealing performance test method according to claim 11, characterized in that it further includes any one or any combination of the following: - The set temperature is 80 + 5 °C; - The value of m is 10 to 15; - The value of n is 5 to 10; - The pressure of the introduced air is 1 to 2 bar.

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