CN116147848A

CN116147848A - High-speed diesel engine cylinder cover tightness test tool device and test method

Info

Publication number: CN116147848A
Application number: CN202211456100.6A
Authority: CN
Inventors: 顾成勇; 李帆; 王凯; 周伟中; 任建军
Original assignee: Hudong Heavy Machinery Co Ltd
Current assignee: Hudong Heavy Machinery Co Ltd
Priority date: 2022-11-21
Filing date: 2022-11-21
Publication date: 2023-05-23

Abstract

The utility model provides a high-speed diesel engine cylinder head tightness test tool device and a test method, wherein the device comprises the following components: an air intake support floor, fasteners, and a seal assembly; the air inlet supporting bottom plate is fastened on the cylinder cover through the fastening piece; the seal assembly seals the cylinder head. The method comprises the following steps: the device is arranged on a cylinder cover to be inspected, the cavity is connected with a compressed air pipeline and immersed in a hot water tank, so that the temperature of the cylinder cover reaches a set temperature; and opening each path of compressed air pipeline in sequence, introducing air with a certain pressure, observing whether the cylinder cover emits bubbles in water, and judging whether the cavity tightness of the cylinder cover meets the requirement. The device has the advantages of simple structure, fewer matched parts, convenient processing, simple and convenient use, practical and effective method, simple and convenient operation, clear and reasonable criterion, and can be also suitable for the tightness test of the cylinder heads of other types of diesel engines.

Description

High-speed diesel engine cylinder cover tightness test tool device and test method

Technical Field

The utility model relates to the technical field of high-speed diesel engines, in particular to a high-speed diesel engine cylinder head tightness test tool device and a test method.

Background

The cylinder cover of the high-speed diesel engine has a complex structure and bears various tasks, namely, the lower plane of the cylinder is sealed, and a combustion chamber is formed by the cylinder cover, the piston and the cylinder sleeve; secondly, the installation positions of a plurality of parts are provided, such as an air inlet valve, an air outlet valve, a transmission mechanism of the air inlet valve, the air outlet valve, an oil sprayer, a starting valve, a pressure reducing valve and the like; the inside of the cylinder cover of the high-speed diesel engine is also provided with an air inlet and exhaust air passage, a cooling water cavity and an oil slide passage.

Because the cylinder cover of the high-speed diesel engine bears great gas pressure and thermal stress in the working process, the cylinder cover is subjected to compressive stress due to the pretightening force of the cylinder cover bolt, and the cylinder cover is bent together with gas; the temperature distribution of the cylinder cover is uneven, the thermal stress of accessories is generated, and the structural shape is complex, so that the stress distribution is uneven. Therefore, the material and the structural size of the cylinder cover are required to ensure that the cylinder cover has enough tightness and can be reliably cooled, and therefore, the effective inspection of the tightness of the cylinder cover is necessary.

The search finds that:

the utility model patent of China of publication No. CN202735034U (cylinder head leakage testing fixture), including a bottom plate, be equipped with at least one bottom surface water hole seal cushion, at least one air inlet connector and at least one clamp pressure head support on the bottom plate, be equipped with at least one clamp pressure head on the clamp pressure head support, wherein: the bottom surface water hole sealing rubber pad is used for sealing a bottom surface water hole of the cylinder cover, the air inlet connector is used for feeding air into the cylinder cover during leakage test, and the clamping pressure head is used for fastening the cylinder cover. The utility model adopts the integral frame, and the small sealing rubber pad is used for replacing the original whole sealing rubber pad at the leak detection position on the frame corresponding to the cylinder cover, so that the interference error can be prevented from being introduced in the leak detection process, the operation is convenient, and the screw teeth can not be damaged. The tool has the following technical problems: the positioning support, the sealing rubber pad support and the positioning pin which are arranged on the bottom plate in a protruding mode are designed, caution is needed in the seating process of the bottom surface of the cylinder cover, the cylinder cover is damaged due to the fact that the processing surface of the cylinder cover is scratched easily due to the fact that the sealing hole is improperly arranged in the centering process, more protrusions are needed for the cylinder cover with more bottom surface cavity holes, and difficulties are caused by the fact that the cylinder cover holes, the protruding rubber pads and the holes are accurately centered, leveled and stably installed due to the fact that the protrusions are too many; in addition, the sealing rubber cushion arranged on the convex support is not indicated whether the convex sealing rubber cushion is plugged into the cylinder cover hole or covers the cylinder cover hole. In summary, the design is suitable for the cylinder cover with smaller volume, lighter weight and fewer holes on the bottom surface, has poorer applicability to the cylinder cover with larger volume and mass and more holes on the bottom surface and the top surface, has more and more complicated operation requirements on sealing and positioning the holes on the bottom surface, and is easy to be unstable when the boss is designed to place the cylinder cover.

The Chinese patent publication No. CN207280693U, namely an engine cylinder head nail hole leakage test fixture, comprises a leakage test bottom plate, wherein the upper surface of the leakage test bottom plate is provided with sealant, and the leakage test bottom plate is used for sealing the bottom of an engine cylinder head; and the screw rod passes through the leakage testing bottom plate, the head part of the screw rod is provided with a thread section, the thread section is provided with an axial slot, when leakage is tested, the through-hole of the engine cylinder cover passes through the screw rod and is locked by the nut, and the slot is used for discharging gas in the through-hole. The leak test tooling is provided with a leak test part, so that the occurrence of the leak test part is effectively avoided. The tool has the following technical problems: the fastening sealing method of welding the screw rod with the bottom plate after penetrating through the bottom plate causes complex tool installation operation and poor generality, and the test cost is increased.

No description or report of similar technology is found at present, and similar data at home and abroad are not collected.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides a high-speed diesel engine cylinder head tightness test tool device and a test method.

According to one aspect of the present utility model, there is provided a high-speed diesel engine cylinder head tightness test fixture device, comprising: an air intake support floor, fasteners, and a seal assembly; the air inlet supporting bottom plate is fastened on the cylinder cover through the fastening piece; the sealing assembly seals the cylinder cover;

wherein:

the fastener includes: the air inlet supporting bottom plate is fastened on the bottom surface of the cylinder cover through the studs, the nuts and the fastening gaskets;

the seal assembly includes:

a first set of seal assemblies, the first set of seal assemblies comprising: the sealing block (13), the first bolt (11), the first gasket and the sealing gasket are sealed at the outlet position of the lubricating oil cavity on the upper surface of the cylinder cover through the first bolt, the first gasket and the sealing gasket;

a second set of seal assemblies, the second set of seal assemblies comprising: the triangular sealing block is sealed at the position of the water outlet hole on the upper surface of the cylinder cover through the second bolt, the second gasket and the triangular sealing plate;

a third set of seal assemblies, the third set of seal assemblies comprising: a first plug screw and a third gasket sealed at an upper surface start valve mounting hole position of the cylinder head;

a fourth set of seal assemblies, the fourth set of seal assemblies comprising: the second screw plug and the first sealing ring are sealed at the position of the mounting hole of the pressure reducing valve on the upper surface of the cylinder cover;

a fifth set of seal assemblies, the fifth set of seal assemblies comprising: the sealing groove and the second sealing ring are arranged in the sealing groove, and the sealing groove and the second sealing ring are sealed at the position of the air port between the cylinder cover and the air inlet supporting bottom plate;

a sixth set of seal assemblies, the sixth set of seal assemblies comprising: and the third sealing rings are sealed at the position of an orifice between the cylinder cover and the air inlet supporting bottom plate.

Optionally, the whole air inlet supporting bottom plate is of a rectangular structure, surface holes are formed in the air inlet supporting bottom plate, and the relative positions and the relative sizes of the surface holes are matched with the structural sizes of the cylinder cover; the air inlet supporting bottom plate is provided with a circular hole; wherein:

the surface pores include: the air port b1, the air port b2, the air port c1, the air port c3 and the annular groove;

four air inlet interfaces are mounted on three side surfaces of the air inlet supporting bottom plate in total and are used for being connected with the compressed air pipe quick connector; the four air inlet interfaces are respectively communicated with the air port b1, the air port b2, the air port c1 and the air port c3 through inner cavities arranged in the air inlet supporting bottom plate; the air port is communicated with a corresponding cavity port on the bottom surface of the cylinder cover, and sealing is realized through a corresponding fifth group of sealing components; wherein the air port b1 is matched with a starting valve cavity of the cylinder cover, and the air port b2 is matched with a pressure reducing valve cavity of the cylinder cover;

the ring groove is matched with the position of the cavity opening on the bottom surface of the cylinder cover, and the cavity opening on the bottom surface of the cylinder cover is sealed through the sixth group of sealing assemblies.

Optionally, the air intake supporting floor has a length, width, and thickness dimension of: 458 x 344 x 25mm;

the distance between the center of the circle of the circular hole and two long sides of the air inlet supporting bottom plate is 172mm; the distance between the center of the circle of the circular hole and the two short sides of the air inlet supporting bottom plate is 192mm and 266mm respectively;

the circular hole diameter is 130mm.

Optionally, a groove for running water is formed in the head of the screw of the stud.

Optionally, the screw thread specification of the stud is: m24×350.

Alternatively, the process may be carried out in a single-stage, the grooves have a size of a length, a width, and a depth of each groove of: 150 x 4mm.

Optionally, the triangle sealing block the triangle sealing plate is the isosceles triangle structure of looks adaptation, three summit positions of isosceles triangle structure are equipped with a through-hole respectively, the second bolt with the second gasket set up in through-hole department.

Optionally, the lengths between the two through hole center positions at the bottom side and the two through hole center positions at the opposite side on the triangular sealing block and the triangular sealing plate are respectively 60mm, and the lengths between the two through hole center positions at the opposite side are respectively 55.8mm.

Optionally, the diameter of the through hole is: 10mm; the screw thread specification of the second bolt is as follows: m10×30.

Optionally, the sealing block and the sealing gasket are rectangular structures with the same fit, two short sides of each rectangular structure are respectively provided with a mounting hole, and the first bolt and the first gasket are arranged at the mounting holes.

Optionally, the sealing block and the gasket are 128mm long and 30mm wide; the diameters of the two mounting holes are 16mm; the distance between the center of the hole of one mounting hole and the adjacent long side is 11mm, the distance between the center of the hole of the other mounting hole and the adjacent short side is 14mm, and the distance between the center of the hole of the other mounting hole and the adjacent long side is 13mm, and the distance between the center of the hole of the other mounting hole and the adjacent short side is 14mm.

Optionally, the first screw plug has a thread specification of M35.

Optionally, the second plug screw has a thread gauge M24.

According to another aspect of the present utility model, there is provided a high-speed diesel engine cylinder head tightness test method implemented based on the test tool device of any one of the above, comprising:

the test tool device is installed on a cylinder cover to be tested, the cavity of the cylinder cover is connected with a compressed air pipeline, and the cylinder cover is immersed in a heat-insulation hot water tank with set temperature for m minutes, so that the temperature of the cylinder cover reaches the set temperature;

and opening each path of compressed air pipeline in sequence, introducing air with certain pressure for n minutes, observing whether the cylinder cover emits bubbles in water, and further judging whether the cavity tightness of the cylinder cover meets the requirement.

Alternatively, the set temperature is 80+5℃.

Optionally, the value of m is 10-15.

Optionally, the value of n is 5-10.

Alternatively, the pressure of the air introduced is 1-2 bar.

Due to the adoption of the technical scheme, compared with the prior art, the utility model has at least one of the following beneficial effects:

the utility model can be used for implementing test detection of the air tightness of the cylinder cover of the high-speed diesel engine, and further easily finding out defects such as cracks which affect the tightness.

According to the utility model, different compressed air pipe quick connector inlets can be switched through the air inlet interfaces arranged on the air inlet supporting bottom plate, so that the purpose of checking different cavities in the cylinder cover is realized.

According to the utility model, the circular holes are formed in the air inlet supporting bottom plate, so that the quality of the test tool is reduced, and the influence on the tightness judgment caused by sealing air in a contact gap when the bottom plate seals the ground plane of the cylinder cover can be effectively avoided.

According to the utility model, the open slot is arranged on the fastening bolt, so that water can smoothly enter the bolt hole of the cylinder cover, and the judgment of tightness caused by the fact that the bolt is tightly screwed by air remained in the hole is eliminated.

The utility model has the advantages of simple structure, less matching parts, convenient processing and easy operation.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

fig. 1 is a structural assembly diagram of a high-speed diesel engine cylinder head tightness test tooling device in an embodiment of the utility model.

Fig. 2 is a schematic view of an air inlet supporting base plate of a test fixture device according to a preferred embodiment of the present utility model.

FIG. 3 is a schematic view of a fastening stud of a test fixture according to a preferred embodiment of the present utility model; wherein (a) is a schematic view of one viewing angle and (b) is a schematic view of another viewing angle.

FIG. 4 is a schematic view of a triangular sealing plate of a test fixture according to a preferred embodiment of the present utility model; wherein (a) is a schematic view of one viewing angle and (b) is a schematic view of another viewing angle.

FIG. 5 is a schematic view of a strip seal plate of a test fixture according to a preferred embodiment of the present utility model; wherein (a) is a schematic view of one viewing angle and (b) is a schematic view of another viewing angle.

In the figure: 1 is an air inlet supporting bottom plate, 2 is a fastening stud, 3 is a water outlet rubber sealing gasket, 4 is a water outlet sealing plate, 5 is a second gasket, 6 is a second bolt, 7 is a fastening gasket, 8 is a nut, 9 is a first screw plug, 10 is a third gasket, 11 is a first bolt, 12 is a first gasket, 13 is a sealing block, 14 is a rubber sealing gasket (sealing gasket), 15 is a sealing ring a,16 is a sealing ring b,17 is a sealing ring c,18 is a second screw plug, 19 is a first sealing ring, 20 is a test cylinder cover, and 21 is an air inlet interface.

Detailed Description

The following describes embodiments of the present utility model in detail: the embodiment is implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given. It should be noted that variations and modifications can be made by those skilled in the art without departing from the spirit of the utility model, which falls within the scope of the utility model.

Fig. 1 is a structural assembly diagram of a high-speed diesel engine cylinder head tightness test tooling device according to an embodiment of the utility model.

As shown in fig. 1, the high-speed diesel engine cylinder head tightness test tool device provided in this embodiment includes: an air inlet supporting bottom plate 1, a fastener and a sealing assembly; the intake support base plate 1 is fastened to the cylinder head 20 by a fastener; the seal assembly seals the cylinder head 20;

wherein:

the fastener comprises: the air inlet supporting bottom plate 1 is fastened on the bottom surface of the cylinder cover through the stud 2, the nut 8 and the fastening gasket 7;

the seal assembly includes:

a first set of seal assemblies, the first set of seal assemblies comprising: the sealing block (13), the first bolt (11), the first gasket 12 and the sealing gasket 14, wherein the sealing block 13 is sealed at the outlet position of the oil-sliding cavity on the upper surface of the cylinder cover 20 through the first bolt 11, the first gasket 12 and the sealing gasket 14;

a second set of seal assemblies, the second set of seal assemblies comprising: the triangular sealing block 4, the second bolt 6, the second gasket 5 and the triangular sealing plate are arranged on the water outlet hole on the upper surface of the cylinder cover 20 in a sealing mode through the second bolt 6, the second gasket 5 and the triangular sealing plate;

a third set of seal assemblies, the third set of seal assemblies comprising: a first plug screw 9 and a third gasket 10, the first plug screw 9 and the third gasket 10 being sealed at the upper surface of the cylinder head 20 at the position of the starting valve mounting hole;

a fourth set of seal assemblies, the fourth set of seal assemblies comprising: a second screw plug 18 and a first seal ring 19, the second screw plug 18 and the first seal ring 19 being sealed at the upper surface relief valve mounting hole position of the cylinder head 20;

a fifth set of seal assemblies, the fifth set of seal assemblies comprising: the sealing groove and the second sealing ring are arranged in the sealing groove, and the sealing groove and the second sealing ring are sealed at the position of the air port between the cylinder cover 20 and the air inlet supporting bottom plate 1;

a sixth set of seal assemblies, the sixth set of seal assemblies comprising: a plurality of third seal rings, which seal at the position of the cavity opening between the cylinder head 20 and the intake support base plate 1.

In a preferred embodiment of this embodiment, the intake support base plate 1 has a rectangular structure as a whole, and is provided with surface holes, the relative positions and dimensions of which are adapted to the structural dimensions of the cylinder head 20; the air inlet supporting bottom plate 1 is provided with a circular hole; wherein:

four air inlet interfaces 21 are mounted on three side surfaces of the air inlet supporting bottom plate 1, and the air inlet interfaces 21 are used for being connected with a compressed air pipe quick connector; the four air inlet interfaces 21 are respectively communicated with an air port b1, an air port b2, an air port c1 and an air port c3 through inner cavity channels arranged in the air inlet supporting bottom plate 1; the air port is communicated with a corresponding cavity port on the bottom surface of the cylinder cover 20 and is sealed by a corresponding fifth group of sealing components; wherein, the air port b1 is matched with the starting valve cavity of the cylinder cover 20, and the air port b2 is matched with the pressure reducing valve cavity of the cylinder cover 20;

the ring groove is adapted according to the position of the cavity opening on the bottom surface of the cylinder head 20, and seals the cavity opening on the bottom surface of the cylinder head 20 through a sixth set of sealing assemblies.

In a preferred embodiment of this embodiment, the air intake supporting floor 1 has a length x width x thickness dimension of: 458 x 344 x 25mm;

the distance between the center of the circular hole and two long sides of the air inlet supporting bottom plate 1 is 172mm; the distance between the center of the circular hole and the two short sides of the air inlet supporting bottom plate 1 is 192mm and 266mm respectively;

the circular hole diameter was 130mm.

In a preferred embodiment of this embodiment, the head of the stud 2 is slotted for running water.

In a preferred embodiment of this embodiment, the screw thread specification of the stud 2 is: m24×350.

In a preferred embodiment of this embodiment, the grooves have a dimension of a length, width, and depth of a x: 150 x 4mm.

In a preferred embodiment of this embodiment, the triangular sealing plate 4 is an isosceles triangle structure with a matching shape, and three vertex positions of the isosceles triangle structure are respectively provided with a through hole, and the second bolt 6 and the second gasket 5 are disposed at the through holes.

In a preferred embodiment of this embodiment, the length between the two through hole core positions on the bottom side of the triangular sealing block 4 and the triangular sealing plate is 60mm, and the length between the two through hole core positions on the opposite side is 55.8mm, respectively.

In a preferred embodiment of this embodiment, the diameter of the through hole is: 10mm; the screw thread specification of the second bolt 6 is: m10×30.

In a preferred embodiment of this embodiment, the sealing block 13 and the sealing pad 14 are of a rectangular structure adapted to each other, and two short sides of the rectangular structure are respectively provided with a mounting hole, where the first bolt 11 and the first gasket 12 are disposed.

In a preferred embodiment of this embodiment, the sealing block 13 and the gasket 14 are 128mm long and 30mm wide; the diameters of the two mounting holes are 16mm; the distance between the center of the hole of one mounting hole and the adjacent long side is 11mm, the distance between the center of the hole of the other mounting hole and the adjacent short side is 14mm, the distance between the center of the hole of the other mounting hole and the adjacent long side is 13mm, and the distance between the center of the hole of the other mounting hole and the adjacent short side is 14mm.

In a preferred embodiment of this embodiment, the first plug 9 has a thread gauge M35.

In a preferred embodiment of this embodiment, the second plug 18 has a thread gauge M24.

The embodiment of the utility model also provides a high-speed diesel engine cylinder cover tightness test method which is realized based on the test tool device of any one of the above embodiments of the utility model.

The test method provided in this embodiment may include the steps of:

s100, mounting a test tool device on a cylinder cover to be tested, connecting a cavity of a cylinder cover with a compressed air pipeline, and immersing the cylinder cover in a heat-insulation hot water tank with a set temperature for m minutes to enable the temperature of the cylinder cover to reach the set temperature;

and S200, sequentially opening each path of compressed air pipeline, introducing air with certain pressure for n minutes, observing whether the cylinder cover emits bubbles in water, and further judging whether the cavity tightness of the cylinder cover meets the requirement.

In one embodiment of S100, the set temperature is 80+5℃.

In a specific application example of S100, m has a value of 10 to 15.

In a specific application example of S200, n has a value of 5 to 10.

In one specific application example of S100, the pressure of the air introduced is 1 to 2bar.

It should be noted that, the steps in the method provided by the present utility model may be implemented by using corresponding components, devices, etc. in the system, and those skilled in the art may refer to a technical solution of the system to implement a step flow of the method, that is, an embodiment in the system may be understood as a preferred example of implementing the method, which is not described herein.

The technical scheme provided by the embodiment of the utility model is further described below with reference to the accompanying drawings.

The utility model aims to design a test tool device for the tightness test of the cylinder cover of the high-speed diesel engine, and the device has the characteristics of simplicity in operation, reliability in use, high accuracy and the like, and the cylinder cover can be verified to be capable of effectively meeting the use requirement of the diesel engine through the test.

As shown in fig. 1, the test fixture device provided in the above embodiment of the present utility model includes an air inlet supporting base plate 1, a fastener and a sealing member. The intake support base plate 1 is the basis of the tightness test. Fastener and sealing member of test fixture device: 4 studs 2, 4 nuts 8 and 4 fastening gaskets 7 for fastening the intake support base plate 1 to the cylinder head; the sealing block 13 seals the upper surface lubricating oil cavity outlet of the cylinder cover through 2

first bolts

11, 2

first gaskets

12 and 1 sealing gasket 14; the triangular sealing block 4 seals the water outlet hole on the upper surface of the cylinder cover through 3 second bolts 6, 3 second gaskets 5 and 1 triangular sealing plate; the first plug screw 9 and the third gasket 10 are used for sealing the starting valve mounting hole on the cylinder cover; the second plug screw 18 and the first seal ring 19 are used to seal the relief valve mounting hole.

As shown in fig. 2, the intake support base plate 1 is specifically:

1. the whole air inlet supporting bottom plate 1 is rectangular, and the whole shape, the relative position and the size of the surface holes are designed according to the outline dimension of the cylinder cover: length 458mm, width 344mm, thickness 25mm; the phi 130mm hole is formed by taking the positions of 172mm/172mm from two long sides and 192mm/266mm from two short sides as circle centers, and the hole can avoid abnormal bubbling in the test to influence the tightness judgment caused by airtight air when the plate is in contact with and sealed with the bottom surface of the cylinder cover. The upper surface is contacted and matched with the bottom surface (cylinder explosion surface) of the cylinder cover during assembly.

2. Four air inlet interfaces 21 are arranged on three sides of the air inlet supporting bottom plate 1 and can be connected with a compressed air pipe quick connector to realize quick switching connection; the four interfaces are communicated with the four air ports b1, b2, c1 and c3 corresponding to the upper surface of the bottom plate through the inner cavity of the bottom plate, the four air ports are communicated with the corresponding cavity ports on the bottom surface of the cylinder cover, and sealing is realized through the corresponding sealing grooves and the inner sealing rings (namely the fifth group of sealing assemblies) thereof. In fig. 2: a is M24 screw hole.

3. The air inlet supporting bottom plate 1 is provided with a fastening bolt hole according to the position and the size of the fastening bolt hole of the cylinder cover, and the air inlet supporting bottom plate 1 is fixedly arranged on the bottom plane of the cylinder cover through a stud 2, a nut 8 and a fastening gasket 7. Wherein the air port b1 is matched with the cavity of the starting valve hole of the cylinder cover, and the air port b2 is matched with the cavity of the pressure reducing valve hole of the cylinder cover.

4. The ring groove on the air inlet supporting bottom plate 1 is designed according to the position and the size of the cavity opening of the bottom surface of the cylinder cover, and the cavity opening of the bottom surface of the cylinder cover is sealed through 7 sealing rings a15, 1 sealing ring b16 and 1 sealing ring c17 in the sixth group of sealing components.

As shown in fig. 3 (a) and (b), the screw 2 has a thread size of m24×350, and a groove having a length of 150mm, a width and a depth of 4mm is formed in the head of the screw, and functions as: after the whole test fixture is assembled and put into a water tank, water is immersed into stud holes of a cylinder cover along the groove, so that the air is prevented from being sealed in the stud holes of the cylinder cover after the stud bolts are screwed down, and the judgment of a sealing test is prevented from being affected.

As shown in fig. 4 (a) and (b), the key point of the triangular sealing block 4 and the sealing gasket 3 is that the relative positions of three phi 10mm holes on the sealing block, namely, the centers of the three holes on the triangular sealing block 4 are positioned on three vertexes of an equilateral triangle with the bottom side of 60mm and the opposite side of 55.8mm, so that the sealing block can be fastened and sealed by using a screw hole at a cooling water outlet on a cylinder cover to install an M10x30 bolt 6.

As shown in fig. 5 (a) and (b), the key of the sealing block 13 and the gasket 14 is the positions of two phi 16 holes, the strip-shaped sealing block 13 is 128mm long and 30mm wide, wherein the center of the hole with the diameter of 16mm at the lower left is 11mm near the long side and 14mm near the short side, and the hole with the diameter of 16mm at the upper right is 13mm near the long side and 14mm near the short side.

The screw plugs 9 and 18 are provided with screw threads M35 and M24 for sealing the top surface air hole of the cylinder cover.

The tightness test method implemented based on the test tool device provided by the embodiment of the utility model specifically comprises the following steps:

the test tool device is installed on the test cylinder cover, a cavity to be tested is connected with a compressed air inlet quick connector at a corresponding connector (such as a b1 port connector) of the bottom plate, the cavity to be tested is connected with a compressed air pipeline, the whole test cylinder cover is immersed in a heat-insulation hot water pool at 80+5 ℃ for standing for about 10 minutes, the temperature of the cylinder cover reaches 80+5 ℃ (the temperature of the cylinder cover can be tested by a point thermometer), then the compressed air pipeline is opened, air with certain pressure (such as 1 bar) is introduced, the ventilation time is 5 minutes, and whether the cylinder cover emits air bubbles in water or not is observed. If no bubbles are generated all the time in the ventilation process, the cavity has good tightness; if bubbles continuously emerge from a certain part of the cylinder cover, the sealing performance of the detection cavity/the cylinder cover is poor; if a certain part occasionally bleeds out a few bubbles, but no bubbles are generated later, the cavity is good in sealing performance. After the tightness of one cavity is detected to be good, the air inlet (such as c 1) of the air inlet supporting bottom plate is switched and connected, the other cavity is detected according to the same method, and if continuous bubbles appear, a bubble outlet is confirmed. The bubble outlet may be found by increasing the venting pressure (e.g. 4 bar). Under the condition that the non-test tool bubbles are confirmed, the non-test tool bubbles can be confirmed to bubble in the cavity of the cylinder cover, the sealing performance of the cylinder cover is poor, and the use requirement of a diesel engine cannot be met. By switching and connecting all air inlets of the air inlet supporting bottom plate, compressed air with certain pressure is introduced and kept for a certain time, if continuous bubbling phenomenon does not occur in the whole process, good tightness of all detection cavities can be judged, and further the cylinder cover is indicated to be good in tightness.

According to the tool device and the method for testing the tightness of the cylinder cover of the high-speed diesel engine, which are provided by the embodiment of the utility model, the tightness of the cylinder cover of the high-speed diesel engine can be effectively tested through multiple test verification. The test tool device is simple in structure, few in matched parts, convenient to process, simple and convenient to use, and the test method is practical, effective, simple and convenient to operate, clear and reasonable in criterion, and applicable to cylinder head tightness tests of diesel engines of other types.

The foregoing embodiments of the present utility model are not all well known in the art.

The foregoing describes specific embodiments of the present utility model. It is to be understood that the utility model is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the utility model.

Claims

1. High-speed diesel engine cylinder head tightness test tool equipment, characterized by, include: an air inlet supporting bottom plate (1), a fastener and a sealing assembly; the air inlet supporting base plate (1) is fastened on the cylinder cover (20) through the fastening piece; the seal assembly seals the cylinder head (20);

wherein:

the fastener includes: the air inlet support base plate (1) is fastened on the bottom surface of the cylinder head through the stud (2), the nut (8) and the fastening gasket (7);

the seal assembly includes:

a first set of seal assemblies, the first set of seal assemblies comprising: a sealing block (13), a first bolt (11), a first gasket (12) and a sealing gasket (14), wherein the sealing block (13) is sealed at the outlet position of the lubricating oil cavity on the upper surface of the cylinder cover (20) through the first bolt (11), the first gasket (12) and the sealing gasket (14);

a second set of seal assemblies, the second set of seal assemblies comprising: the triangular sealing block (4), the second bolt (6), the second gasket (5) and the triangular sealing plate are sealed at the position of the water outlet hole on the upper surface of the cylinder cover (20) through the second bolt (6), the second gasket (5) and the triangular sealing plate;

a third set of seal assemblies, the third set of seal assemblies comprising: a first plug screw (9) and a third gasket (10), the first plug screw (9) and the third gasket (10) being sealed at an upper surface start valve mounting hole position of the cylinder head (20);

a fourth set of seal assemblies, the fourth set of seal assemblies comprising: a second screw plug (18) and a first seal ring (19), the second screw plug (18) and the first seal ring (19) being sealed at an upper surface relief valve mounting hole position of the cylinder head (20);

a fifth set of seal assemblies, the fifth set of seal assemblies comprising: the sealing groove and the second sealing ring are arranged in the sealing groove, and the sealing groove and the second sealing ring are sealed at the position of an air port between the cylinder cover (20) and the air inlet supporting bottom plate (1);

a sixth set of seal assemblies, the sixth set of seal assemblies comprising: and the third sealing rings are sealed at the position of an opening between the cylinder cover (20) and the air inlet supporting bottom plate (1).

2. The high-speed diesel engine cylinder head tightness test tool device according to claim 1, wherein the air inlet supporting bottom plate (1) is of a rectangular structure as a whole, surface holes are formed in the air inlet supporting bottom plate, and the relative positions and the sizes of the surface holes are matched with the structural sizes of the cylinder head (20); the air inlet supporting bottom plate (1) is provided with a circular hole; wherein:

four air inlet interfaces (21) are mounted on three side surfaces of the air inlet supporting bottom plate (1), and the air inlet interfaces (21) are used for being connected with a compressed air pipe quick connector; the four air inlet interfaces (21) are respectively communicated with the air port b1, the air port b2, the air port c1 and the air port c3 through inner cavities arranged in the air inlet supporting bottom plate (1); the air port is communicated with a corresponding cavity port on the bottom surface of the cylinder cover (20) and is sealed through a corresponding fifth group of sealing components; wherein the port b1 is mated with a starting valve bore of the cylinder head (20), and the port b2 is mated with a relief valve bore of the cylinder head (20);

the ring groove is matched with the position of the cavity opening on the bottom surface of the cylinder cover (20), and the cavity opening on the bottom surface of the cylinder cover (20) is sealed through the sixth group of sealing components.

3. The high-speed diesel engine cylinder head tightness test tool device according to claim 2, wherein the intake support base plate (1) has a length, width, and thickness dimension of: 458 x 344 x 25mm;

the distance between the center of the circle of the circular hole and two long sides of the air inlet supporting bottom plate (1) is 172mm; the distance between the center of the circular hole and the two short sides of the air inlet supporting bottom plate (1) is 192mm and 266mm respectively;

the circular hole diameter is 130mm.

4. The high-speed diesel engine cylinder head tightness test tool device according to claim 1, wherein the screw head of the stud (2) is provided with a groove for running water.

5. The high-speed diesel engine cylinder head tightness test fixture device according to claim 5, wherein the screw specification of the stud (2) is: m24×350; and/or

The grooves have a size of a length, a width, and a depth of each groove of: 150 x 4mm.

6. The high-speed diesel engine cylinder head tightness test tool device according to claim 1, wherein the triangular sealing block (4) is of an isosceles triangle structure which is matched with the triangular sealing plate, three vertex positions of the isosceles triangle structure are respectively provided with a through hole, and the second bolt (6) and the second gasket (5) are arranged at the through holes.

7. The high-speed diesel engine cylinder head tightness test tool device according to claim 6, wherein the length between two through hole center positions at the bottom side on the triangular sealing block (4) and the triangular sealing plate is 60mm, and the length between two through hole center positions at the opposite side is 55.8mm respectively; and/or

The diameter of the through hole is as follows: 10mm; the screw thread specification of the second bolt (6) is as follows: m10×30.

8. The high-speed diesel engine cylinder head tightness test tool device according to claim 1, wherein the sealing block (13) and the sealing gasket (14) are of rectangular structures which are matched, two short side sides of each rectangular structure are respectively provided with a mounting hole, and the first bolt (11) and the first gasket (12) are arranged at the mounting holes.

9. The high-speed diesel engine cylinder head tightness test tooling device according to claim 8, wherein the sealing block (13) and the sealing gasket (14) are 128mm long and 30mm wide; the diameters of the two mounting holes are 16mm; the distance between the center of the hole of one mounting hole and the adjacent long side is 11mm, the distance between the center of the hole of the other mounting hole and the adjacent short side is 14mm, and the distance between the center of the hole of the other mounting hole and the adjacent long side is 13mm, and the distance between the center of the hole of the other mounting hole and the adjacent short side is 14mm.

10. The high-speed diesel engine cylinder head tightness test tool device according to claim 1, wherein the screw thread specification of the first screw plug (9) is M35; and/or

The screw thread specification of the second screw plug (18) is M24.

11. A high-speed diesel engine cylinder head tightness test method based on the test fixture device of any one of claims 1-10, comprising:

12. The high speed diesel engine cylinder head tightness test method according to claim 11, further comprising any one or more of the following:

-the set temperature is 80+5 ℃;

-said m has a value of 10 to 15;

-said n has a value of 5 to 10;

the pressure of the air introduced is 1 to 2bar.