KR102351432B1 - Trap apparatus for preventing flame of internal combustion engine - Google Patents

Abstract

The present invention relates to a trap device for preventing flame ejection of an internal combustion engine, which is to minimize deformation of elastic force of a coil spring, comprising: a main sheet; an upper cover provided with a cover spacer; a trap unit; a disk provided inside the trap unit; a plurality of coil springs interposed between the upper cover and the disk; a stopper; and a first fastening bolt.

Description

Trap apparatus for preventing flame of internal combustion engine

The present invention relates to a trap device for preventing flame eruption of an internal combustion engine installed in a crankcase among internal combustion engines of ships using gas as the main fuel to absorb and reduce the flame emitted to the outside. As coil springs for elastic deflection are interposed between the upper cover and the disk, not one, but a plurality, the pressure of the trap device for preventing flame ejection can be easily adjusted according to the requirements of each internal combustion engine. The present invention relates to a trap device for preventing flame ejection of an internal combustion engine, in which the elastic force deformation of a coil spring can be minimized by supporting the disk so that it does not rise further despite excessive pressure rise in the crankcase.

In general, ships use an internal combustion engine that directly converts high-temperature, high-pressure gas generated by burning fuel into energy.

A general structure of a ship's internal combustion engine consists of an energy conversion unit that generates power from an engine unit having a plurality of cylinder devices and converts the power into mechanical kinetic energy.

A crank portion, which is a transmission device, is connected to the engine portion, and the crank portion is surrounded by a crankcase. The inside of the crankcase maintains a relatively high temperature and pressure by the high-temperature and high-pressure gas of the engine.

When the internal pressure of the crankcase rises above a prescribed pressure, the internal gas is discharged to the outside by an excessive pressure so that the inside of the crankcase can always be maintained at a normal pressure.

On the other hand, when a flame is generated due to an erroneous explosion inside the crankcase, the flame is widely leaked to the outside, causing fatal damage to the human body as well as various mechanical devices around the crankcase. In order to prevent this, a flame ejection prevention trap device is installed around the engine part of the internal combustion engine, particularly in the crankcase, to block the flame from being ejected to the outside in the event of an explosion.

As an example of such a trap device for preventing flame eruption of an internal combustion engine, Korean Patent Laid-Open No. 10-2011-0018698 (2011.02.24.) discloses a main sheet coupled to an opening of a crankcase from which a flame is ejected, and an upper side of the main sheet. an upper sheet coupled to the upper sheet through a support bolt, a trap unit installed between the main sheet and the upper sheet, a disk coupled to the opening, and a coil inserted between the disk and the upper sheet to elastically support the disk In the trap device for preventing flame ejection of an internal combustion engine comprising: a spring; Each of the locking jaws is formed on the outer upper part, and the O-ring has locking grooves corresponding to the locking jaws formed on the inner and outer surfaces to prevent the O-ring from being separated by the flame ejected through the opening. A trap device for preventing flame eruption of an internal combustion engine is disclosed.

In addition, Korean Utility Model Registration No. 20-0444111 (2009.04.03.) has a hollow base attached to the crankcase to absorb and depressurize multiple flames ejected from an overheated internal combustion engine, and the base is spaced at a predetermined interval. In the trap device for preventing flame ejection of an internal combustion engine having a cover installed to be spaced apart and a disk that blocks the hollow of the base by a spring at normal times and moves to the cover side when a force is applied, between the base and the cover, the disk A multi-stage flame absorbing means installed to surround the outside of the multi-stage flame absorbing means and a perforated plate provided inside the innermost means among the multi-stage flame absorbing means, the perforated plate having a plurality of through-holes perforations, the perforations of the perforated plate are relatively to the crankcase side Disclosed is a trap device for preventing flame spouting of an internal combustion engine having a large size and uniformly dispersing means of a relatively small size sequentially on the cover side of the trap device.

In addition, Korean Patent Registration No. 10-0767283 (2007.10.09.) has a structure in which a plurality of straps with radial irregularities formed on the plate surface are overlapped, and is installed on the outer periphery of the opening of the crankcase, and prevents flames leaking out of the crankcase. The primary flame evacuation duct part, which absorbs while passing through the exit hole formed between the straps and discharges it in a non-flammable state due to non-combustion due to oxygen deficiency, and a network structure in which a plurality of metal wires are crossed and overlapped. A flame heat absorbing net for absorbing and dispersing the flame leaking to the outside of the primary flame guiding duct, and a flame heat absorbing net installed outside the flame heat absorbing net so that the flame heat absorbing net can be distorted within a predetermined width Deformation prevention space part providing an empty space part; And it is installed on the outside of the deformation prevention space in a structure in which the straps such as the primary flame extraction duct are overlapped, and the residual flame passing through the deformation prevention space is tertiarily passed through the extraction hole formed between the straps. Disclosed is a trap device for preventing flame ejection of an internal combustion engine, characterized in that it includes a secondary flame guiding duct that finally absorbs and discharges in a non-flame state due to non-combustion due to oxygen deficiency.

However, in the conventional trap device for preventing flame eruption of the above-mentioned conventional internal combustion engine, as only one coil spring for elastically biasing the disk in the closing direction is interposed between the upper cover and the disk, the pressure cannot be adjusted to correspond to the requirements of each internal combustion engine. In addition, there is a problem in that the tine property of the coil spring is easily deformed and the entire trap device needs to be replaced.

The present invention was applied for as a result of the research support project for material parts and equipment industry independence (AICT-015-T2) carried out with the support of the Next Generation Convergence Technology Institute with the resources of Gyeonggi Province in 2021 to improve the above-mentioned problems.

1. Korean Patent Publication No. 10-2011-0018698 (2011.02.24.) 2. Korea Utility Model Registration No. 20-0444111 (2009.04.03.) 3. Korean Patent Registration No. 10-0767283 (2007.10.09.)

According to the present invention, as a plurality of coil springs for elastically biasing the disk in the closing direction are interposed between the upper cover and the disk, instead of one, the pressure of the trap device for preventing flame ejection can be easily adjusted according to the requirements of each internal combustion engine. To provide a trap device for preventing flame eruption of an internal combustion engine in which a stopper protruding downward from the upper cover supports the disc not to rise any more despite excessive pressure rise in the crankcase, so that deformation of the elastic force of the coil spring can be minimized. The purpose.

In order to achieve the above object, the present invention provides a trap device for preventing flame spout of an internal combustion engine that is installed in an opening of a crankcase among internal combustion engines of ships to absorb and decompress a flame emitted to the outside, wherein the trap device is installed in the crankcase and A main sheet in which a hollow corresponding to the opening is formed in the center, an O-ring insertion groove into which an O-ring is inserted is formed on the upper surface, and an O-ring cover seating groove into which the O-ring cover is seated and coupled is connected to the outside of the O-ring insertion groove; An upper cover installed spaced apart from the main sheet at a predetermined distance and provided with a cylindrical cover spacer on the lower edge side, a trap part interposed between the main sheet and the cover spacers of the upper cover, and inside the trap part a disk provided to open and close the hollow of the main seat according to the internal pressure of the crankcase; a plurality of coil springs interposed between the upper cover and the disk to elastically bias the disk in the closing direction; The upper end is coupled to the stopper that protrudes toward the disk and supports so that the disk does not rise further, and the O-ring cover is inserted into the O-ring cover seating groove of the main seat while fastening and fixing the main seat and the upper cover in a spaced apart state from each other. It provides a trap device for preventing flame ejection of an internal combustion engine, characterized in that it includes a first fastening bolt for press-adhering to the .

In the present invention, the coil springs are installed one by one at predetermined angular intervals, and a spring guide into which the upper end of the coil spring is inserted is formed on the lower surface of the upper cover to protrude downward.

In the present invention, a total of three coil springs are installed, one for each 120 degree angular interval, or a total of four, one for each 90 degree angular interval, or a total of six coil springs, one for each 60 degree angular interval, or 45 degree angle A total of 8 are installed, one at each interval.

In the present invention, the stopper extends into the coil spring through the spring guide.

In the present invention, the stopper is formed in a two-stage support bar structure with a buffer spring interposed therebetween.

In the present invention, it further includes a support pipe through which a second fastening bolt for maintaining the main sheet and the upper cover spaced apart from each other and fastening the upper cover and the crankcase to each other is passed.

In the present invention, a plurality of the first fastening bolt and the support pipe are alternately spaced apart on the same circle on the upper cover, and a part of the first fastening bolt is coupled with an eye nut to which a crane hook can be coupled.

In accordance with the requirements of each internal combustion engine, the trap device for preventing flame eruption of an internal combustion engine according to the present invention has a coil spring that elastically biases a disk in a closing direction, not one, but a plurality of coil springs between the upper cover and the disk. There is an advantage that the pressure adjustment of the trap device can be easily made.

In addition, in the trap device for preventing flame eruption of an internal combustion engine according to the present invention, as the stopper protruding downwardly on the upper cover supports the disk so that the disk does not rise further despite excessive pressure rise in the crankcase, deformation of the elastic force of the coil spring is minimized. be able to

In addition, in the trap device for preventing flame eruption of an internal combustion engine according to the present invention, as the stopper is formed in a two-stage support rod structure in which a buffer spring is interposed, an additional elastic force by the stopper is provided to the disk in addition to the elastic force of the coil spring, and the elastic force of the coil spring is deformed There is an advantage that this can be minimized.

1 is a cross-sectional structural view of a trap device for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention.
2 is a plan view showing various installation structures of a stopper in the trap device for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention;
3 is a detailed structural view of a stopper formed in a two-stage support rod structure in the trap device for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention.
Figure 4 is a flame ejection prevention operation of the trap device for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, this is for the purpose of describing in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily implement the invention, and this does not mean that the technical spirit and scope of the present invention is limited thereto.

1 is a cross-sectional structural view of a trap device for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention, and FIG. 2 is a trap device for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention. 3 is a detailed structural diagram of a stopper formed in a two-stage support rod structure in the trap device for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention, and FIG. 4 is an embodiment of the present invention It is the operation diagram of the flame ejection prevention of the trap device for flame ejection prevention of an internal combustion engine according to the following.

A trap device for preventing flame eruption of an internal combustion engine according to an embodiment of the present invention is installed in an opening of a crankcase of an internal combustion engine of a ship to absorb and decompress the flame emitted to the outside. , installed in the crankcase, a hollow corresponding to the opening is formed in the center, an O-ring insertion groove into which an O-ring is inserted is formed on the upper surface, and an O-ring cover seating groove into which the O-ring cover is seated and coupled is connected to the outside of the O-ring insertion groove. A main sheet formed to be formed so as to be formed, an upper cover installed spaced apart from the main sheet by a predetermined distance and provided with a cylindrical cover spacer on the lower edge side, and a trap part interposed between the main sheet and the cover spacer of the upper cover and a disk provided inside the trap unit and configured to open and close the hollow of the main seat according to the internal pressure of the crankcase, and a plurality of coils interposed between the upper cover and the disk to elastically deflect the disk in the closing direction A spring, an upper end coupled to the upper cover, protruding toward the disk, and a stopper supporting the disk so that the disk does not rise further, and the O-ring cover while fastening the main sheet and the upper cover in a spaced apart state from each other It is characterized in that it includes a first fastening bolt for press-fitting the O-ring cover seating groove of the main seat.

Hereinafter, with reference to FIGS. 1 to 4, the components of the trap device 1 for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention and the connection relationship between the components will be described in detail. .

As shown in FIGS. 1 to 4, the trap device 1 for preventing flame eruption of an internal combustion engine according to an embodiment of the present invention is installed in the opening 5 of the crankcase 3 of the internal combustion engine of a ship. It serves to absorb and decompress the flame emitted to the outside of the crankcase 3 due to excessive pressure rise in the crankcase 3 , and includes the main seat 10 , the upper cover 20 , and the trap part 30 . ), and a disk 40 , a plurality of coil springs 50 , a stopper 60 and a first fastening bolt 70 .

In addition, the trap device 1 for preventing flame eruption of an internal combustion engine according to an embodiment of the present invention may be installed in the crankcase 3 of an internal combustion engine of a ship using light oil as the main fuel, and the internal pressure is relatively higher. It may be installed in the crankcase 3 of the internal combustion engine of a ship using high gas as the main fuel.

Here, the main sheet 10 serves to form a lower support surface of the trap part 30 to be described later, and the lower surface is surface-supported by the crankcase 3 of the ship's internal combustion engine, and the crankcase 3 is located in the center. A hollow 11 corresponding to the opening 5 is formed, and an O-ring 12 to which the disk 40 is hermetically adhered is fixedly installed on the upper surface.

An O-ring insertion groove 13 into which the O-ring 12 is inserted is formed on the upper surface of the main seat 10 for installation of the O-ring 12 . In addition, an O-ring cover seating groove 15 in which the O-ring cover 14 is seated is formed on the outside of the O-ring insertion groove 13 to be connected to the O-ring insertion groove 13 .

The upper cover 20 is installed to be spaced apart from the main sheet 10 at a predetermined interval. The upper cover 20 serves to form an upper support surface of the trap unit 30 to be described later, and is installed to be spaced apart from the main sheet 10 at a predetermined interval.

A cover spacer 21 having a cylindrical shape on which the upper surface of the trap part 30 is supported is provided on the lower edge side of the upper cover 20 . The cover spacer 21 serves to form the upper housing of the trap device 1 for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention.

Also, on the lower surface of the upper cover 20, a spring guide 22 into which an upper end of a coil spring 50 to be described later is inserted is formed to protrude downward.

And a plurality of fastening holes to which the first fastening bolts 70 for fastening and fixing the main sheet 10 and the upper cover 20 are coupled to each other, the upper cover 20 and the crankcase 3 are provided in the upper cover 20 A plurality of fastening holes to which the support pipe 80 for penetration of the second fastening bolts fastened to each other are coupled are alternately spaced apart on the same circle.

The trap part 30 is interposed between the above-described main sheet 10 and the cover spacer 21 of the upper cover 20 . The trap unit 30 forms the lower housing of the trap device 1 for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention, and at the same time the disc 40 according to the internal pressure of the crankcase 3 therein. By forming the lifting and lowering working space, it can be formed into a cylindrical body made of a triple steel plate, particularly a cold rolled steel plate, to withstand high temperature and high pressure.

A wire mesh for absorbing a flame that absorbs and disperses the flame introduced into the trap part 30 from the crankcase 3 by a mesh structure in which a plurality of metal wires are crossed and overlapped on the inner wall of the trap part 30 ( 31) is preferably provided.

A disk 40 is provided inside the aforementioned trap unit 30 . The disk 40 supports the internal pressure of the crankcase 3 through the elastic force of a plurality of coil springs 50 to be described later, while forming the hollow 11 of the main seat 10 according to the internal pressure of the crankcase 3 . It acts as a kind of opening/closing valve body that opens and closes, and is formed of a steel plate, particularly a hot-rolled steel plate.

A disk cover that protects the disk 40 from the coil spring 50 may be laminated on the disk 40 . The disk cover is preferably made of a steel plate, in particular, a hot-rolled steel plate material.

A plurality of coil springs 50 are interposed between the above-described upper cover 20 and the disk 40 . The coil spring 50 provides an elastic force for elastically deflecting the disk 40 to close the hollow 11 of the main seat 10, and 1 for every predetermined angular interval between the upper cover 20 and the disk 40 It is preferable to install a plurality of each.

In particular, as shown in FIG. 2 , a total of three coil springs 50 may be installed, one for each 120 degree angular interval, between the upper cover 20 and the disk 40, and the upper cover 20 and the disk 40 ) may be installed, one for each 90 degree angular interval, and a total of six may be installed, one for each 60 degree angular interval between the upper cover 20 and the disk 40, and the upper cover 20 A total of eight may be installed between the disk 40 and the disk 40, one for each 45 degree angular interval.

As the coil spring 50 for elastically biasing the disk 40 in the closing direction is interposed between the upper cover 20 and the disk 40, not one, but a plurality, according to the requirements of each internal combustion engine, a flame ejection prevention trap device The pressure adjustment, that is, the elastic force on the disk 40 can be easily achieved by adjusting the number of coil springs 50 .

For stable installation of the coil spring 50, it is preferable that the spring guide 22 into which the upper end of the coil spring 50 is inserted protrudes downwardly on the lower surface of the upper cover 20.

The top of the stopper 60 is coupled to the above-described upper cover 20 and protrudes toward the disk 40 . The stopper 60 serves to minimize the deformation of the elastic force of the coil spring 50 by supporting the disk 40 so that it does not further rise despite the excessive pressure increase in the crankcase 3 .

It is preferable that the stopper 60 penetrates the spring guide 22 of the upper cover 20 and extends into the coil spring 50 .

The stopper 60 may be formed in the form of a single support rod, but in particular, as shown in FIG. 3 , it is preferable to have a two-stage support rod structure in which the buffer spring 61 is interposed. When the stopper 60 is formed in a two-stage support bar structure in which the buffer spring 61 is interposed, an additional elastic force by the buffer spring 61 of the stopper 60 is applied to the disk 40 in addition to the elastic force of the coil spring 50. As provided, the elastic force deformation of the coil spring 50 can be minimized.

The above-described main sheet 10 and the upper cover 20 are fastened and fixed in a state spaced apart from each other by the first fastening bolts 70 . This first fastening bolt 70 can be formed of a known stud bolt.

On the other hand, the first fastening bolt 70 also serves to press-fit the O-ring cover 14 to the O-ring cover seating groove 15 of the main seat 10, and for this, the lower end supports the upper end of the O-ring cover 14. A stepped portion is formed.

In addition, for the stable mutual coupling of the main sheet 10 and the upper cover 20, it is preferable that a plurality of first fastening bolts 70 are provided on the same circle at regular angular intervals, and a plurality of first fastening bolts are provided. It is preferable that a part of the 70 is coupled with an eye nut 71 to which the crane hook can be coupled so that the trap device 1 for preventing flame eruption of an internal combustion engine according to an embodiment of the present invention is secured to the crane hook to enable transport and movement. do.

The above-described upper cover 20 and the crankcase 3 are fastened to each other by the second fastening bolts 81 . This second fastening bolt 81 can be formed with a known hexagonal bolt, and the lower end of the second fastening bolt 81 penetrates the main sheet 10 and is fastened by digging into the crankcase 3 .

For stable coupling of the upper cover 20 and the crankcase 3, a plurality of second fastening bolts 81 are provided at regular angular intervals on the same circle in which the plurality of first fastening bolts 70 are arranged. However, it is preferable that one is provided between each of the first fastening bolts 70 . In other words, it is preferable that a plurality of the first fastening bolts 70 and the second fastening bolts 81 are alternately spaced apart on the same circle.

For coupling of the second fastening bolt 81 , the main sheet 10 and the upper cover 20 are maintained spaced apart from each other by the support pipe 80 for penetrating the second fastening bolt 81 . Like the second fastening bolts 81, a plurality of support pipes 80 are provided, one at a time interval, on the same circle and the same circle in which the plurality of first fastening bolts 70 are arranged. ), it is preferable that one is provided between each. In other words, it is preferable that a plurality of the first fastening bolts 70 and the support pipe 80 are alternately spaced apart on the same circle.

The trap device 1 for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention is installed in the crankcase 3 having the opening 5 formed therein, and as shown in FIG. 4 , the internal pressure of the crankcase 3 . When the pressure is less than the prescribed pressure, the hollow 11 of the main seat 10 is closed by the elastic force of the plurality of coil springs 50, and when the internal pressure of the crankcase 3 rises above the prescribed pressure, As the disk 40 is lifted upward by the pressure exceeding the total elastic force of the plurality of coil springs 50, the internal gas or flame of the crankcase 3 is flame ejected in the internal combustion engine according to an embodiment of the present invention. As it flows out through the trap device for prevention (1), the inside of the crankcase (3) can always be maintained at a normal pressure.

In the case of the trap device 1 for preventing flame ejection of an internal combustion engine according to an embodiment of the present invention, the coil spring 50 for elastically biasing the disk 40 in the closing direction is the upper cover 20 and the disk 40 ), the pressure of the trap device 1 for preventing flame spout of the internal combustion engine can be easily adjusted by adjusting or selecting the number of coil springs 50 according to the requirements of each internal combustion engine. have.

In addition, in the case of the trap device 1 for preventing flame eruption of an internal combustion engine according to an embodiment of the present invention, a stopper 60 for supporting the disc 40 not to rise further despite an excessive pressure increase in the crankcase 3 . ) is formed to protrude downward from the upper cover 20, so that deformation of the elastic force of the coil spring 50 can be minimized.

In addition, when the stopper 60 is formed in a two-stage support bar structure in which the buffer spring 61 is interposed, an additional elastic force by the buffer spring 61 of the stopper 60 in addition to the elastic force of the coil spring 50 is applied to the disk 40. It is possible to further minimize the deformation of the elastic force of the coil spring 50 while being provided to.

Although the above embodiments have been described by way of example, it is obvious to those skilled in the art that the present invention can be embodied in various other forms without departing from the spirit and scope thereof. Accordingly, the above-described embodiments are to be regarded as illustrative rather than restrictive, and all embodiments within the scope of the appended claims and their equivalents will be included within the scope of the present invention.

1: Trap device for preventing flame eruption of internal combustion engine
3: crankcase
5: opening
10: main seat
11: hollow
12 : O-ring
13: O-ring insertion groove
14: O-ring cover
15: O-ring cover seating groove
20: upper cover
21 : cover spacer
22: spring guide
30: trap part
31: wire mesh for flame absorption
40 : disk
50: coil spring
60: stopper
61: buffer spring
70: first fastening bolt
71: eye nut
80: support pipe
81: second fastening bolt

Claims (7)

In the trap device for preventing flame ejection of an internal combustion engine installed in the opening (5) of the crankcase (3) of the internal combustion engine of a ship to absorb and decompress the flame emitted to the outside:
It is installed in the crankcase 3, a hollow 11 corresponding to the opening 5 is formed in the center, and an O-ring insertion groove 13 into which the O-ring 12 is inserted is formed on the upper surface, and the O-ring insertion groove ( 13) on the outer side of the O-ring cover 14 is seated and coupled to the O-ring cover seating groove 15 is formed to be connected to the main sheet 10;
an upper cover 20 spaced apart from the main sheet 10 by a predetermined interval and provided with a cylindrical cover spacer 21 on the lower edge side;
a trap part 30 interposed between the main sheet 10 and the cover spacer 21 of the upper cover 20;
a disk (40) provided inside the trap part (30) and opening and closing the hollow (11) of the main seat (10) according to the internal pressure of the crankcase (3);
a plurality of coil springs 50 interposed between the upper cover 20 and the disk 40 to elastically bias the disk 40 in the closing direction;
a stopper (60) having an upper end coupled to the upper cover (20), protruding toward the disk (40), and supporting the disk (40) not to rise any further; and
A first fastening for pressing and adhering the O-ring cover 14 to the O-ring cover seating groove 15 of the main sheet 10 while fastening and fixing the main sheet 10 and the upper cover 20 in a state of being spaced apart from each other including a bolt (70);
The coil springs 50 are installed one by one at predetermined angular intervals, and a spring guide 22 into which the upper end of the coil spring 50 is inserted is formed on the lower surface of the upper cover 20 to protrude downward.
The stopper 60 penetrates the spring guide 22 and extends into the coil spring 50, and the stopper 60 is formed in a two-stage support rod structure in which a buffer spring 61 is interposed. Flame of an internal combustion engine A trap device for preventing ejection. delete The method according to claim 1,
A total of three coil springs 50 are installed, one for each 120 degree angular interval, or a total of four, one for each 90 degree angular interval, or a total of six coil springs 50, one for each 60 degree angular interval, or a 45 degree angular interval. A trap device for preventing flame eruption of an internal combustion engine, characterized in that a total of eight are installed, one for each.
delete delete The method according to claim 1,
A support pipe 80 through which the main sheet 10 and the upper cover 20 are spaced apart from each other and through which a second fastening bolt for fastening and fixing the upper cover 20 and the crankcase 3 to each other passes. ) trap device for preventing flame eruption of an internal combustion engine, characterized in that it further comprises.
7. The method of claim 6,
A plurality of the first fastening bolt 70 and the support pipe 80 are alternately spaced apart on the same circle on the upper cover 20, and some of the first fastening bolts 70 have a crane hook. A trap device for preventing flame ejection of an internal combustion engine, characterized in that a coupleable eye nut (71) is coupled.

Images