Dual-fuel engine jet component sealing detection device and detection method

Abstract

The present invention discloses a sealing detection device and a detection method for a jet component of a dual-fuel engine. The device includes an upper sealing cover plate, a side test cover plate, and a lower sealing cover plate. The upper sealing cover plate includes an upper cover plate, a connecting pipe, and a ball valve. The rabbet of the upper cover plate is embedded between the inner sleeve and the outer pipe in the upper interface of the double-wall connecting pipe. O-ring seals are respectively arranged on the inner sleeve and the outer pipe, and the upper cover plate is fixed on the upper interface of the double-wall connecting pipe. The side test cover plate is fixed on the side interface of the double-wall connecting pipe. The double-wall connecting pipe and the pipe seat are fixedly connected into one body, and the lower sealing cover plate is hermetically fixed on the lower interface of the pipe seat. The method includes: 1) completing the installation of the sealing detection device; 2) hoisting the jet component into water to detect whether there is leakage. The present invention can accurately detect whether the jet component leaks with only one pressurization test on the jet component. It is fast, efficient, and the detection result is reliable, significantly shortening the detection time, reducing the detection cost, and remarkably improving the detection efficiency and detection quality.

Description

Technical Field

[0001] The present invention relates to a component detection device for a dual-fuel engine, and particularly to a device and method for accurately detecting the airtightness of a natural gas injection assembly of a dual-fuel engine during the assembly process, belonging to the technical field of dual-fuel engine manufacturing. Background Art

[0002] As Figure 1 shown, the jet assembly of a dual-fuel engine includes a double-wall pipe joint 10, a pipe seat 20, and a natural gas injection pipe 30. The double-wall pipe joint 10 and the pipe seat 20 are fixedly connected up and down. The upper part of the natural gas injection pipe 30 is inclined and the lower part is vertical. The inclined pipe body 301 in the upper part is located inside the double-wall pipe joint 10, and the lower end of the vertical pipe body 302 passes through the pipe seat 20 and is supported in the pipe seat 20 through the pipe body seat 303 in the middle of the vertical pipe body 302. The upper end of the jet assembly is connected to a double-wall pipe for transporting natural gas, and the bottom is installed on the cylinder head of the dual-fuel engine. It is a key component related to the safe transportation of natural gas fuel for the dual-fuel engine. After the jet assembly is assembled, its sealing performance directly affects the product quality and overall performance of the dual-fuel engine, and is also related to the operation safety of the dual-fuel engine.

[0003] The common method in the dual-fuel engine industry for detecting the jet assembly is to conduct airtightness detection tests on the double-wall pipe joint and the pipe seat in the jet assembly respectively. The specific method is as follows:

[0004] 1. The annular vacuum chamber between the inner sleeve and the outer pipe of the double-wall pipe joint is vented to the atmosphere. After the natural gas chamber of the inner sleeve is closed, a 1.0 Mpa water pressure test is carried out, and the pressure is maintained for 30 minutes to observe whether there is leakage.

[0005] 2. The natural gas chamber of the inner sleeve of the double-wall pipe joint is vented to the atmosphere. The annular vacuum chamber between the inner sleeve and the outer pipe is closed for a 0.2 Mpa water pressure test, and the pressure is maintained for 30 minutes to observe whether there is leakage.

[0006] 3. The injection pipe installation chamber in the pipe seat is vented to the atmosphere, and a 0.7 Mpa water pressure test is carried out on the cooling water chamber, and the pressure is maintained for 30 minutes to observe whether there is leakage.

[0007] The above detection method has the following defects: it is time-consuming and laborious to operate, the detection time for each part is relatively long, and after the detection is completed, the parts need to be cleaned and maintained, which is time-consuming and laborious. The inspection result can only confirm whether there is air leakage in a single part, and it is impossible to know whether the jet assembly leaks after assembly. Summary of the Invention

[0008] The purpose of the present invention is to provide a dual-fuel engine jet assembly seal detection device and detection method with a relatively simple structure, which is safe, reliable, and can accurately and efficiently detect whether the jet assembly leaks and the leakage location.

[0009] The present invention is realized through the following technical solutions:

[0010] A sealing detection device for a jet component of a dual-fuel engine, comprising an upper sealing cover plate, a side test cover plate and a lower sealing cover plate. The upper sealing cover plate includes an upper cover plate, a ball valve and a connecting pipe. The lower end of the connecting pipe passes through the center of the upper cover plate and is fixedly welded to the upper cover plate; the upper end of the connecting pipe is connected to the ball valve, and a pressure gauge is connected in parallel; a stop is axially extended from the upper cover plate, and the stop is embedded between the inner sleeve and the outer pipe in the upper interface of the double-wall connecting pipe. Two upper cover plate O-ring seals are embedded at intervals on the outer circle of the stop, and one inner counterbore O-ring seal is embedded in the inner counterbore of the stop. One top O-ring seal is embedded at the top of the inner sleeve. The upper cover plate is fixed on the upper interface of the double-wall connecting pipe by several screws; the side test cover plate is fixed on the side interface of the double-wall connecting pipe. The double-wall connecting pipe and the pipe seat are fixedly connected into one body, and the lower sealing cover plate is hermetically fixed on the lower side interface of the pipe seat.

[0011] The object of the present invention can also be further realized by the following technical measures.

[0012] Further, the side test cover plate is fixed on the side interface of the double-wall connecting pipe by several screws. A circle of several air vents is provided on the side test cover plate, and the air vents correspond to the positions of the vacuum chambers between the inner sleeve and the outer pipe in the side interface. The side test cover plate is sealed with the end face of the inner sleeve and the end face of the outer pipe respectively through an inner O-ring seal embedded in the end face of the inner sleeve and an outer O-ring seal embedded in the end face of the outer pipe.

[0013] Further, the lower sealing cover plate includes a lower cover plate and a sealing sleeve. The top end of the sealing sleeve is fixedly welded under the central through hole of the lower cover plate. The lower end of the vertical pipe body of the lower part of the natural gas injection pipe sequentially passes through the pipe seat and the lower cover plate and extends into the sealing sleeve; at the mating part of the outer circle of the vertical pipe body of the lower part of the natural gas injection pipe and the central hole of the lower cover plate, it is sealed through a lower O-ring seal embedded in the wall of the central hole of the lower cover plate. Several fastening screws passing through the pipe seat from top to bottom fix the lower sealing cover plate on the lower end port of the pipe seat. A sealing plate is welded at the bottom of the sealing sleeve. The inner diameter D of the sealing sleeve is greater than the outer diameter d of the natural gas injection pipe, and the length L1 of the lower part of the natural gas injection pipe extending into the sealing sleeve is less than the inner length L of the sealing sleeve.

[0014] A detection method for a sealing detection device of a jet component of a dual-fuel engine, comprising the following steps:

[0015] 1) First, fit 2 upper cover O-ring seals at intervals on the outer circle of the rabbet of the upper cover plate, fit 1 inner counterbore O-ring seal in the inner counterbore of the rabbet, and fit 1 top O-ring seal on the top of the inner sleeve. Then align the inner counterbore of the rabbet with the position of the inner sleeve filter screen of the double-wall pipe joint, embed the rabbet between the inner sleeve and the outer pipe in the upper interface of the double-wall pipe joint, and then fix the upper sealing cover plate on the upper interface of the double-wall pipe joint with several screws, so as to seal the natural gas chamber of the double-wall pipe joint and the vacuum chamber between the inner sleeve and the outer pipe of the double-wall pipe joint.

[0016] Then fit the inner O-ring seal in the end face of the inner sleeve, fit the outer O-ring seal in the end face of the outer pipe, and then embed the positioning boss of the side test cover plate into the inner sleeve of the double-wall pipe joint to position the side test cover plate, and fix the side test cover plate on the side interface of the double-wall pipe joint with several fastening screws, so that several air vents in a circle of the side test cover plate communicate with the vacuum chamber.

[0017] Next, fit the lower O-ring seal on the hole wall of the central hole of the lower cover plate, and then pass the lower end of the vertical pipe body at the lower part of the natural gas injection pipe through the central hole of the lower cover plate and extend it into the sealing sleeve on the lower side of the lower cover plate, and embed the lower end of the pipe seat on the lower side of the middle part of the vertical pipe body into the positioning counterbore of the lower cover plate to position the lower sealing cover plate under the lower end port of the pipe seat. Finally, fix the lower sealing cover plate under the lower end port of the pipe seat with several screws passing through the pipe seat from top to bottom, thus completing the installation of the sealing detection device for the double-fuel engine jet component.

[0018] 2) First, connect a compressed air hose to the upper end of the pipe joint of the upper sealing cover plate, and then lift the sealing detection device for the double-fuel engine jet component into the water with rust inhibitor in the detection water tank until it is completely submerged in the water. Open the ball valve, and introduce the compressed air simulating natural gas from the compressed air hose through the pipe joint into the inner sleeve sealed at both ends of the double-wall pipe joint, and the air pressure in the inner sleeve rises. When the air pressure shown on the pressure gauge is 0.7 Mpa, close the ball valve to stop supplying compressed air to the inner sleeve.

[0019] 3) Keep the pressure for 10 minutes, and at the same time observe whether there are bubbles emerging from the air vents in a circle of the side test cover plate of the double-wall pipe joint in the water. If there are bubbles emerging, it indicates that the compressed air in the natural gas chamber has leaked into the vacuum chamber, and the leakage position of the inner sleeve can be inferred according to the position where the bubbles emerge. If there are no bubbles emerging and the pressure gauge value does not change during the pressure holding period, it indicates that there is no leakage in this set of jet components and it is a qualified product. After removing the sealing detection device for the double-fuel engine jet component, clean the qualified jet components and then they can be directly hoisted and installed on the cylinder head of the double-fuel engine.

[0020] The present invention adopts a simple structure in which an upper sealing cover plate, a side test cover plate, and a lower sealing cover plate are respectively fixed to the corresponding ports of the jet component. The existing method of separately conducting a hydrostatic test on the double-wall pipe joint and the base, and the natural gas chamber and the vacuum chamber need to be alternately subjected to multiple hydrostatic tests, is changed to a method of inputting compressed air simulating natural gas into the natural gas chamber sealed by the jet component through the pipe joint on the upper sealing cover plate, and at the same time injecting water into the vacuum chamber through a circle of air-permeable holes on the side test cover plate. Observe whether there are bubbles emerging from the air-permeable holes of the test cover plate. If there are bubbles emerging, it indicates that the compressed air in the inner sleeve has leaked into the vacuum chamber, thus determining that the quality of the inner sleeve of the jet component is unqualified. The present invention only needs to conduct a single pressurization test after immersing the jet component as a whole, and can quickly and accurately detect whether the jet component leaks air. It is fast, efficient, and the test results are reliable, significantly shortening the test time, reducing the test cost, and significantly improving the test efficiency and test quality.

[0021] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given only by way of example with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the detection device of the present invention installed on the jet component;

[0023] Figure 2 is Figure 1 the A-A cross-sectional view of. SPECIFIC IMPLEMENTATION METHOD

[0024] The present invention will be further described below in conjunction with the accompanying drawings and an embodiment of the seal detection of the single-cylinder jet component of the L28DF marine dual-fuel engine.

[0025] As Figure 1 and Figure 2As shown, the double-wall nozzle 10 and the nozzle base 20 of the dual-fuel engine jet component are fixedly connected as a whole. The seal detection device for the dual-fuel engine jet component in this embodiment includes an upper seal cover plate 1, a side test cover plate 2, and a lower seal cover plate 3. The upper seal cover plate 1 includes an upper cover plate 11, a ball valve 12, and a nozzle 13. The lower end of the nozzle 13 passes through the center of the upper cover plate 11 and is fixedly welded to the upper cover plate 11. The upper end of the nozzle 13 is connected to the ball valve 12, and a pressure gauge 14 is connected in parallel. An outer stop 111 extends axially from the upper cover plate 11. The outer stop 111 is embedded between the inner sleeve 101 and the outer pipe 102 in the upper interface 101 of the double-wall nozzle. Two upper cover plate O-ring seals 51 are embedded at intervals on the outer circumference of the outer stop 111. The upper cover plate 11 is fixed to the upper interface of the double-wall nozzle by three screws 4. An inner counterbore O-ring seal 52 is embedded in the inner counterbore of the outer stop, and a top O-ring seal 53 is embedded at the top of the inner sleeve 101. The sealing of the four O-ring seals forms a natural gas chamber 103 inside the inner sleeve 101, a vacuum chamber 104 between the inner sleeve 101 and the outer pipe 102, and the natural gas chamber 103 and the vacuum chamber 104 are also sealed by the top O-ring seal 53.

[0026] The side test cover plate 2 is fixed to the side interface of the double-wall nozzle 10 by six screws 4. There are eight ventilation holes 21 arranged in a circle on the side test cover plate 2. The positions of the ventilation holes correspond to the positions of the vacuum chamber 104. Between the side test cover plate 2 and the end faces of the inner sleeve 101 and the outer pipe 102, they are sealed by an inner O-ring seal 54 embedded in the end face of the inner sleeve 101 and an outer O-ring seal 55 embedded in the end face of the outer pipe 102 respectively.

[0027] The lower seal cover plate 3 includes a lower cover plate 31 and a seal sleeve 32. The top of the seal sleeve 32 is fixedly welded under the central through hole 311 of the lower cover plate. The lower end of the vertical pipe body 302 of the lower part of the natural gas injection pipe 30 passes through the nozzle base 20 and the lower cover plate 31 in sequence and extends into the seal sleeve 32. At the mating part between the outer circumference of the vertical pipe body 302 of the lower part of the natural gas injection pipe 30 and the central hole 311 of the lower cover plate, it is sealed by a lower O-ring seal 56 embedded in the wall of the central hole of the lower cover plate. Several fastening screws 6 passing through the nozzle base from top to bottom fix the lower seal cover plate 3 to the lower end port of the nozzle base. A sealing plate 321 is welded at the bottom of the seal sleeve 32. The inner diameter D of the seal sleeve is larger than the outer diameter d of the natural gas injection pipe. The length L1 of the lower part of the vertical pipe body 302 of the natural gas injection pipe 30 extending into the seal sleeve 32 is less than the inner length L of the seal sleeve 32, so that the lower part of the vertical pipe body 302 can smoothly extend into the seal sleeve 32.

[0028] A detection method for a seal detection device of a dual-fuel engine jet component includes the following steps:

[0029] 1) First, fit 2 upper cover O-ring seals 51 at intervals on the outer circle of the rabbet 111 of the upper cover plate 11, fit 1 inner counterbore O-ring seal 52 in the inner counterbore of the rabbet, and fit 1 top O-ring seal 52 on the top of the inner sleeve 101. Then align the inner counterbore of the rabbet with the position of the inner sleeve filter of the double-wall pipe joint, embed the rabbet 111 between the inner sleeve 101 and the outer pipe 102 in the upper interface of the double-wall pipe joint, and then fix the upper sealing cover plate 1 to the upper interface of the double-wall pipe joint with 3 screws 4, thereby sealing the natural gas chamber 103 of the double-wall pipe joint 10 and the vacuum chamber 104 between the inner sleeve 101 and the outer pipe 102 of the double-wall pipe joint 10.

[0030] Then fit the inner O-ring seal 54 in the end face of the inner sleeve 101, fit the outer O-ring seal 55 in the end face of the outer pipe 102, and then embed the positioning boss 22 of the side test cover plate into the inner sleeve 101 of the double-wall pipe joint 10 to position the side test cover plate 2, and fix the side test cover plate 2 to the side interface of the double-wall pipe joint 10 with several screws 4, so that the 8 air vents 21 in a circle of the side test cover plate 2 communicate with the vacuum chamber 104 between the inner sleeve 101 and the outer pipe 102 of the double-wall pipe joint 10, facilitating the injection of water into the vacuum chamber 104 through the air vents 21. If there is a leak in the inner sleeve 101, bubbles will emerge from the air vents 21, and the sealing detection effect of the jet component can be very conveniently observed.

[0031] Next, fit the lower O-ring seal 56 on the wall of the central hole 311 of the lower cover plate. Then, pass the lower end of the vertical pipe body 302 of the natural gas injection pipe 30 through the central hole 311 of the lower cover plate and extend it into the sealing sleeve 32 on the lower side of the lower cover plate 31, and embed the lower end of the pipe seat 303 on the lower side of the middle part of the vertical pipe body 302 into the positioning counterbore 312 of the lower cover plate to position the lower sealing cover plate 3 under the lower end port of the pipe seat. Finally, fix the lower sealing cover plate 3 under the lower end port of the pipe seat with several fastening screws 6 passing through the pipe seat from top to bottom, thus completing the installation of the sealing detection device for the jet component of the dual-fuel engine.

[0032] 2) First, connect a compressed air hose 7 to the upper end of the pipe joint 13 of the upper sealing cover plate 1. Then, lift the sealing detection device for the jet component of the dual-fuel engine into the water with rust inhibitor in the detection water tank until it is completely submerged. Open the ball valve 12, and introduce the compressed air simulating natural gas from the compressed air hose 7 through the pipe joint 13 into the natural gas chamber 103 of the double-wall pipe joint 10, and the air pressure in the natural gas chamber 103 rises. When the air pressure shown on the pressure gauge is 0.7 Mpa, close the ball valve 12 to stop supplying compressed air to the natural gas chamber 103.

[0033] 4) Keep the pressure for 10 minutes. At the same time, observe whether there are bubbles emerging from the air vent holes 21 in a circle around the side test cover plate 2 of the double-wall connecting pipe 10 in the water. If there are bubbles emerging, it indicates that the compressed air in the natural gas chamber 103 has leaked into the vacuum chamber 104, and the leakage position of the inner sleeve 102 can be inferred according to the position where the bubbles emerge. If there are no bubbles emerging and the pressure gauge value does not change during the pressure holding period, it indicates that there is no leakage in this set of jet components, and it belongs to a qualified product. After removing the double-fuel engine jet component sealing detection device, clean the jet components that belong to qualified products, and then they can be directly hoisted and installed on the cylinder head of the double-fuel engine.

[0034] In addition to the above embodiments, the present invention can also have other implementation methods. Any technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A detection method for a sealing detection device of a jet component using a dual-fuel engine. The detection device includes an upper sealing cover plate, a side test cover plate, and a lower sealing cover plate. The upper sealing cover plate includes an upper cover plate, a ball valve, and a connecting pipe. The lower end of the connecting pipe passes through the center of the upper cover plate and is fixedly welded to the upper cover plate. The upper end of the connecting pipe is connected to the ball valve, and a pressure gauge is connected in parallel. A rabbet extends axially from the upper cover plate. The rabbet is embedded between the inner sleeve and the outer pipe of the upper interface of the double-wall connecting pipe. Two upper cover plate O-ring seals are embedded at intervals on the outer circumference of the rabbet, one inner counterbore O-ring seal is embedded in the inner counterbore of the rabbet, and one top O-ring seal is embedded at the top of the inner sleeve. The upper cover plate is fixed to the upper interface of the double-wall connecting pipe by several screws. The double-wall connecting pipe and the pipe seat are fixedly connected as a whole. The side test cover plate is fixed to the side interface of the double-wall connecting pipe, and the lower sealing cover plate is hermetically fixed to the lower side interface of the pipe seat. The side test cover plate is fixed to the side interface of the double-wall connecting pipe by several screws. A circle of several vent holes is provided on the side test cover plate. The vent holes correspond to the positions of the vacuum chambers between the inner sleeve and the outer pipe in the side interface. The side test cover plate is sealed with the end face of the inner sleeve and the end face of the outer pipe respectively through the inner O-ring seal embedded in the end face of the inner sleeve and the outer O-ring seal embedded in the end face of the outer pipe. The lower sealing cover plate includes a lower cover plate and a sealing sleeve. The top of the sealing sleeve is fixedly welded under the central through hole of the lower cover plate. The lower end of the vertical pipe of the lower part of the natural gas injection pipe sequentially passes through the pipe seat and the lower cover plate and extends into the sealing sleeve. At the mating part between the outer circumference of the vertical pipe of the lower part of the natural gas injection pipe and the central hole of the lower cover plate, it is sealed through the lower O-ring seal embedded in the wall of the central hole of the lower cover plate. Several fastening screws passing through the pipe seat from top to bottom fix the lower sealing cover plate to the lower end port of the pipe seat. A sealing plate is welded at the bottom of the sealing sleeve. The inner diameter D of the sealing sleeve is greater than the outer diameter d of the natural gas injection pipe. The length L1 of the lower part of the vertical pipe of the natural gas injection pipe extending into the sealing sleeve is less than the inner length L of the sealing sleeve. It is characterized in that It includes the following steps: 1) First, install two upper cover plate O-ring seals at intervals on the outer circumference of the rabbet of the upper cover plate, install one inner counterbore O-ring seal in the inner counterbore of the rabbet, and install one top O-ring seal at the top of the inner sleeve. Then align the inner counterbore of the rabbet with the position of the inner sleeve filter screen of the double-wall connecting pipe, embed the rabbet between the inner sleeve and the outer pipe of the upper interface of the double-wall connecting pipe, and then use several screws to fix the upper sealing cover plate to the upper interface of the double-wall connecting pipe, thereby sealing the natural gas chamber of the double-wall connecting pipe and the vacuum chamber between the inner sleeve and the outer pipe of the double-wall connecting pipe. Then install the inner O-ring seal in the end face of the inner sleeve and the outer O-ring seal in the end face of the outer pipe. Then embed the positioning boss of the side test cover plate into the inner sleeve of the double-wall connecting pipe to position the side test cover plate, and fix the side test cover plate to the side interface of the double-wall connecting pipe through several fastening screws, so that a circle of several vent holes on the side test cover plate communicates with the vacuum chamber. Next, insert the lower O-ring into the wall of the center hole of the lower cover plate. Then, insert the lower end of the vertical tube body at the lower part of the natural gas injection pipe through the center hole of the lower cover plate and into the sealing sleeve on the lower side of the lower cover plate. Insert the lower end of the tube body seat on the lower side of the middle part of the vertical tube body into the positioning countersunk hole of the lower cover plate, and position the lower sealing cover plate under the lower end port of the tube seat. Finally, use several screws that pass through the tube seat from top to bottom to fix the lower sealing cover plate under the lower end port of the tube seat, thus completing the installation of the dual-fuel engine injection assembly sealing detection device. 2) First, connect a compressed air hose to the upper end of the pipe on the upper sealing cover plate. Then, hoist the dual-fuel engine jet assembly seal test device into the water in the test tank filled with rust-proof liquid until it is completely submerged. Open the ball valve and allow compressed air simulating natural gas to flow from the compressed air hose through the pipe into the natural gas chamber sealed at both ends of the double-wall pipe. The pressure in the natural gas chamber will increase. When the pressure gauge shows 0.7 MPa, close the ball valve to stop the supply of compressed air to the natural gas chamber. 3) Maintain the pressure for 10 minutes while observing whether bubbles emerge from the vent holes around the test cover on the side of the double-walled pipe in the water. If bubbles emerge, it means that compressed air has leaked from the natural gas chamber into the vacuum chamber. The location of the bubble can be inferred from the location of the inner sleeve leak. If no bubbles emerge and the pressure gauge value does not change during the pressure maintenance period, it means that the jet assembly is leak-free and is a qualified product. After removing the dual-fuel engine jet assembly sealing detection device, clean the jet assembly that is a qualified product and then directly hoist it onto the cylinder head of the dual-fuel engine for installation.

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