JP2011069378A - Flame protective wall layer for relief valve and method for forming the same and relief valve of internal combustion engine having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relief valve for an internal combustion engine capable of preventing pressure reduction failure by alternately arranging a flame shielding part and a heat transfer part. <P>SOLUTION: The flame protective wall layer 60 for the relief valve for the internal combustion engine includes many metal straps having heat transfer properties and heat resistance and a plurality of metal nets also having heat transfer properties and heat resistance. The metal straps and the metal nets are alternately laminated one by one and adjacent metal straps form a separation space by separating from each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

    The present invention relates to a relief valve, and more particularly to a flame barrier layer for a relief valve, a method for forming the same, and a relief valve for an internal combustion engine having the flame barrier layer.

  A relief valve for an internal combustion engine is attached to a crankcase of a ship or automobile internal combustion engine, and when an abnormally high pressure is generated due to an erroneous explosion inside the crankcase, by releasing the gas inside the crankcase to the outside, This is a device that always maintains the normal pressure inside the crankcase.

  However, if a high-temperature flame due to an accidental explosion is released to the outside as it is, the person around the crankcase and various mechanical devices will be fatally damaged. A flame barrier is installed to block the spraying of the flame.

FIG. 1 is a sectional view showing a structure of a conventional relief valve for an internal combustion engine, and FIG. 2 is an enlarged sectional view showing a flame barrier layer included in the relief valve shown in FIG.
Referring to FIGS. 1 and 2, a conventional relief valve for an internal combustion engine includes a base plate 1 in which an opening 1a communicating with the inside of a crankcase is formed, and a lid plate 2 installed at a certain distance from the base plate. The valve plate 3 is elastically supported by the spring 4 between the base plate and the lid plate, closes / opens the opening 1a of the base plate, and is disposed on the gas exhaust path between the base plate and the lid plate. It includes a flame barrier layer 6 that performs flame removal and cooling.

  The flame barrier layer 6 is configured to prevent a flame from being transmitted to the outside of the explosion relief valve along the exhaust gas when the high temperature gas generated inside the crankcase is discharged. and a heat transfer unit 6b for absorbing heat of the exhaust gas.

  The flame blocking unit 6a includes a plurality of wrinkled corrugated metal straps stacked along the axial direction of the valve, and the space between two adjacent metal straps stacked adjacent to each other is disposed in the space. It is discharged outside the high-temperature casuga generated from the crankcase. That is, the space between the metal straps functions as a discharge passage for discharging the hot gas. In general, the explosive relief valve is arranged in a cylindrical shape, the plurality of metal straps are arranged so as to be wound around each other about a central axis of the valve, and the discharge passage is arranged on the valve. It has a structure extending along the radial direction. The interval between the metal straps to be stacked is arranged to be sufficiently small so that the flame in the exhaust gas is gradually reduced while the exhaust gas passes through the exhaust passage.

  At this time, when the area of the metal strap to be laminated is increased in order to promote the absorption of heat from the exhaust gas, the flow resistance in the exhaust passage is increased and the exhaust gas discharge efficiency is lowered. Let For this reason, the heat transfer unit 6b is separately disposed in front of the flame blocking unit to assist heat absorption of the exhaust gas. That is, the heat of the exhaust gas is first absorbed by the heat transfer unit 6b and then additionally absorbed through the metal strap of the flame blocking unit 6a. Generally, the heat transfer unit 6b is formed of a stacked metal mesh in which a plurality of metal meshes in which metal wires are connected in a lattice form, and the center of the valve is the center axis. It arrange | positions along the inner surface of the flame interruption | blocking part 6a. That is, the metal net is laminated along a direction perpendicular to the axial direction of the valve, is disposed so as to be perpendicular to the traveling direction of the exhaust gas, and is positioned in front of the flame blocking unit.

  The heat of the exhaust gas flowing in from the crankcase through the opening 1a is first absorbed through the surface of the metal mesh constituting the heat transfer unit 6b, and then discharged through the discharge path to enter the flame blocking unit 6a. It is absorbed again through the metal strap. Therefore, it is possible to improve the cooling efficiency without increasing the flow path resistance of the exhaust gas. Reference numeral 5 in FIG. 1 denotes a spacer pipe for maintaining a constant distance between the base plate and the lid plate.

  However, the flame barrier layer 6 of the conventional relief valve for an internal combustion engine is manufactured by separately manufacturing the flame blocking part 6a and the heat transfer part 6b, respectively, and then arranging them at appropriate positions on the base plate. Since the work had to be performed, the manufacturing process and structure were complicated, thereby increasing the manufacturing cost.

  In addition, when the metal straps are stacked, there is a problem in that it is difficult to form a discharge passage having an appropriate cross-sectional area because a sufficient space is not secured between the metal straps. In particular, when adjacent metal straps are in surface contact with each other, a discharge passage is not formed, and thus the flow resistance of the exhaust gas increases rapidly, and the exhaust gas cannot be discharged. As a result, the pressure reducing condition of the relief valve for the internal combustion engine is not satisfied, and the case where it is treated as a defective product frequently occurs.

Korean Patent No. 10-0776783

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to alternately dispose a flame blocking section and a heat transfer section to prevent a decompression failure. It is an object of the present invention to provide a flame barrier layer for a relief valve which is new and improved.

Another object of the present invention is to provide a method for forming a flame barrier layer as described above.
Still another object of the present invention is to provide a relief valve for an internal combustion engine having the flame barrier layer as described above.

  In order to achieve the above object, a flame barrier layer for a relief valve according to an embodiment of the present invention is disposed to be spaced apart from each other by a certain distance, and includes a plurality of flame shields having separated spaces, and the flame shields, A plurality of heat transfer units located in the separated space so as to be alternately arranged. At least one discharge path is provided inside the flame barrier layer, through which high temperature gas supplied from the crankcase of the internal combustion engine is discharged to the outside by removing the flame and reducing the temperature.

In one embodiment, the flame blocking part may include a metal strap having a plurality of through holes, and the heat transfer part may include a metal net disposed in the separation space.
In one embodiment, the flame blocking part may include a bent metal strap having a plurality of protrusions and recesses, and the heat transfer part may include a metal net disposed in the separation space. For example, the flame blocking portion includes a plurality of connecting portions that form a metal chain by connecting a plurality of metal pieces and end portions of the metal pieces to each other, and the pair of metal pieces connected to the connecting portions include: It is possible to arrange symmetrically with respect to a connecting axis passing through the connecting portion.

In one embodiment, the flame blocking part includes a plurality of protrusions protruding from the surface by a certain height to prevent surface contact between the flame blocking parts adjacent to each other.
In order to achieve the above object, the flame barrier layer for a relief valve according to an embodiment of the present invention can be integrally formed by the following process. First, when exhaust gas from an internal combustion engine is discharged, a first strap that forms a flame blocking portion that can remove the flame is wound around a first roller to form a heat transfer portion for lowering the temperature of the exhaust gas. Wind the second strap around the second roller. Thereafter, the first strap and the second strap are joined together to form an integral strap. The integral strap is wound around a third roller, and the flame blocking portion and the heat transfer portion are alternately stacked in order along a direction perpendicular to the axial direction of the third roller.

  In one embodiment, the method further includes the step of converting the integrated strap before winding the integrated strap around the third roller, wherein the flame blocking unit and the heat transfer unit are along an axial direction of the third roller. Are alternately stacked.

  To achieve the above object, a relief valve for an internal combustion engine according to an embodiment of the present invention includes a base having an opening communicating with a crankcase of the internal combustion engine, and is movably fixed to the base and selects the opening. A gate for selectively passing high temperature exhaust gas from the crankcase through the opening, a discharge path disposed on the base so as to surround the opening, and for discharging the exhaust gas to the outside A flame barrier layer in which flames included in the exhaust gas are blocked from being discharged to the outside, and a heat barrier layer alternately arranged with a heat transfer unit for reducing the temperature of the exhaust gas, And a lid that is fixed to the upper surface of the flame barrier layer and is disposed above the opening, and forms a discharge space for storing the exhaust gas together with the gate and the flame barrier layer. .

  As an example, the flame blocking portions and the heat transfer portions are alternately stacked along the thickness direction of the flame barrier layer, and are alternately stacked along the radial direction of the discharge space having a cylinder shape. . For example, the flame blocking part includes a plurality of metal straps each having a plurality of through holes, the heat transfer part includes a plurality of metal nets, and the flame barrier layer is formed of the metal along the radial direction. Straps and metal nets can be arranged alternately. At this time, the plurality of through holes arranged in the metal straps adjacent to each other are arranged in a line along the radial direction to form the discharge path, and the exhaust gas penetrates the flame barrier layer. Discharged. The total cross-sectional area of the through-hole formed in the metal strap disposed adjacent to the discharge space may be the same as the area of the opening formed in the base.

  In one embodiment, the flame blocking part and the heat transfer part are alternately stacked along the height direction of the flame barrier layer, and are alternately stacked along the central axis of the discharge space having a cylinder shape. . For example, the flame blocking part includes a plurality of bent metal straps each having a plurality of convex parts and concave parts, the heat transfer part includes a metal net, and the flame barrier layer extends along the central axis. The metal straps and metal nets can be alternately arranged. At this time, the metal straps are arranged in a line along the first line, and the metal straps are arranged in a line along the second line. Arranged along a central axis, the discharge path is formed as a corrugated space between adjacent metal straps, and the metal net is disposed on the discharge path. The bent metal strap includes a plurality of connecting portions that connect a plurality of metal pieces and respective end portions of the metal pieces to form a metal chain, and the pair of metal pieces connected to the connecting portions includes: , Which are parallel to the central axis and symmetrical to each other with respect to a connecting axis passing through the connecting portion.

  In one embodiment, the flame blocking part includes a metal strap having a plurality of protrusions protruding from the surface by a certain height, and the heat transfer part secures a separation space from the adjacent flame blocking part. A metal net having a spacer of the size may be included.

  In an exemplary embodiment, the apparatus may further include a gate adjusting member that controls the opening of the gate according to the pressure of the exhaust gas in the crankcase and in the exhaust space. At this time, the gate adjusting member may include an elastic member connected to the lid and the gate.

  As an example, the flame barrier layer includes a first barrier layer surrounding the discharge space and a second barrier layer disposed in a suburb of the first barrier layer, the first barrier layer and the second barrier layer, A buffer space can be provided between the two.

  According to the relief valve for an internal combustion engine according to the present invention, the discharge of the flame through the discharge passage can be effectively blocked while stably providing the discharge passage and the cooling area of the high temperature gas discharged from the crankcase. it can. Therefore, the cooling action of the exhaust gas can be effectively performed without adversely affecting the pressure reducing performance of the relief valve.

It is sectional drawing which shows the structure of the conventional relief valve for internal combustion engines. It is an expanded sectional view which shows the flame barrier layer contained in the relief valve shown in FIG. It is sectional drawing of the relief valve for internal combustion engines by 1st Example of this invention. FIG. 3 is a plan view of the internal combustion engine relief valve shown in FIG. 2. It is a figure which shows the flame barrier layer shown in FIG. It is a figure which shows the flame interruption | blocking part of the flame barrier layer shown in FIG. It is a figure which shows the heat transfer part of the flame barrier layer shown in FIG. It is a figure which shows the modification Example of the flame interruption | blocking part shown in FIG. It is a figure which shows the structure which laminated | stacked the flame interruption | blocking part shown in FIG. It is a block diagram which shows the flame barrier layer which comprises the flame interruption | blocking part shown in FIG. It is a figure which shows the manufacturing method of the flame barrier layer shown in FIG. It is sectional drawing of the relief valve for internal combustion engines by 2nd Example of this invention. It is a top view of the relief valve for internal combustion engines shown in FIG. It is a figure which shows the flame barrier layer shown in FIG. It is a figure which shows the modification Example of the flame barrier layer shown in FIG. It is a figure which shows the manufacturing method of the flame barrier layer shown in FIG. It is sectional drawing of the relief valve for internal combustion engines by 3rd Example of this invention. It is a top view of the relief valve for internal combustion engines shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The present invention can be variously modified and can have various forms, and specific embodiments will be described in detail with reference to the drawings. However, this should not be construed as limiting the invention to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals have been given to like components while describing the figures. In the drawings, the size of the structure is shown enlarged from the actual size for the sake of clarity of the present invention. The terms such as first and second can be used to describe various components, but the components are not limited by the terms. The terminology is used only for the purpose of distinguishing one component from another. For example, the first component may be referred to as the second component without departing from the scope of the present invention, and the second component may be referred to as the first component as well.

  The terms used in the present application are merely used to describe particular embodiments, and are not intended to limit the present invention. The singular form includes the plural form unless the context clearly indicates otherwise.

  In this application, terms such as “comprising” or “having” are intended to mean that a feature, number, step, operation, component, part, or combination thereof described in the specification is present. It should be understood that it does not exclude the possibility of the presence or addition of one or more other features or numbers, steps, actions, components, parts, combinations thereof, etc. .

  Unless defined differently, all terms used herein, including technical or scientific terms, are generally understood by those with ordinary knowledge in the technical field to which this invention belongs. Have the same meaning. Terms such as those defined in commonly used dictionaries should be construed as having a meaning consistent with the meaning possessed in the context of the related art and, unless explicitly defined in this application, are unusual. Or is not overly interpreted in a formal sense.

  For the embodiments of the present invention disclosed herein, the specific structural and functional descriptions are provided merely for the purpose of illustrating the embodiments of the present invention. The present invention can be implemented in various forms and is not limited to the embodiments described in the text.

  FIG. 3 is a cross-sectional view of the internal combustion engine relief valve according to the first embodiment of the present invention, and FIG. 4 is a plan view of the internal combustion engine relief valve shown in FIG. The relief valve shows a state in which the left side is closed and the right side is opened.

  3 to 4, a relief valve 100 for an internal combustion engine according to a first embodiment of the present invention includes an opening 10a that is fixed to a crankcase (not shown) of the internal combustion engine and communicates with the crankcase. A base 10, a lid 20 disposed on the upper part of the base 10, and movably fixed to the base to selectively open the opening 10 a, and selectively discharge hot exhaust gas from the crankcase through the opening. It includes an inflow gate 30, a lid 20 and a gate adjusting member 40 connected to the gate 30 to control the movement of the gate 30, and a flame barrier layer 60 for removing and cooling the exhaust gas flame.

  As an example, the base 10 constitutes a main body of the relief valve 100 and communicates with the inside of a crankcase (not shown) of an internal combustion engine disposed below through the opening 10a. Accordingly, the base 10 may have various shapes and sizes depending on the shape and size of the crankcase connected to the lower portion. In the case of the present embodiment, as shown in FIG. 4, a cylinder type valve connected to the upper part of a cylindrical crankcase is disclosed. However, it is obvious that the present invention is not limited to the cylinder type valve, and it is also obvious that the crankcase to be connected can have various shapes.

  The flame barrier layer 60 is disposed on the base 10, and high temperature exhaust gas flowing from the crankcase through the opening 10 a is stored above the opening 10 a formed in the base 10. A discharge space (S) is formed. For example, the exhaust space (S) is defined by the flame barrier layer 60, the gate 30, and the lid 20 disposed on the upper surface of the base 10, and hot exhaust gas is generated inside the crankcase and It flows into the discharge space (S) and is discharged to the outside through the flame barrier layer 60.

  In one embodiment, one end of the gate 40 is rotatably fixed to the periphery of the base 10 adjacent to the opening 10a, and the opening 10a can be closed or opened. In this embodiment, the gate is composed of a pair of flat plates arranged symmetrically with respect to the central axis of the opening, and the left and right sides of the opening can be opened individually. .

  As an example, the gate adjusting member 40 is in contact with the upper surface of the gate and the lower surface of the lid, and controls the rotational movement of the gate to determine whether the opening 10a is opened or closed. In the present embodiment, the gate adjustment member 40 includes an elastic member that can be elastically deformed, and elastically deforms the length of the gate adjustment member 40 disposed between the lid 20 and the gate 30. Thus, the rotational movement of the gate 30 is controlled. For example, the gate adjustment member 40 includes a linear spring. However, it is obvious that the member is not necessarily limited to an elastic member as long as the length in the longitudinal direction connecting the lid and the gate can be adjusted in a stretchable manner.

  The relief valve 100 is fixed to the upper part of the crankcase by a fixing means 50. For example, the fixing means 50 includes a bolt. For example, a plurality of the fixing means 50 are arranged along the periphery of the lid 20 of the relief valve, and the sealing performance can be improved together with the fixing to the crankcase. It is obvious that a sealing member (not shown) for enhancing the sealing performance of the discharge space (S) can be further included between the fixing means 50 and the lid 20.

  When the high temperature gas is discharged from the discharge space (S) to the outside, the flame barrier layer 60 is configured to block a flame from being transmitted to the outside of the relief valve 100 along the discharge gas. (Heat shield) and a heat transfer unit for absorbing heat of the exhaust gas. At this time, the flame blocking part and the heat transfer part may be alternately stacked along the thickness direction of the flame barrier layer 60 to sufficiently secure a space between the adjacent flame blocking parts. it can. As a result, the discharge passage formed between the flame blocking portions is not formed, and the pressure reduction characteristics of the valve 100 can be prevented from deteriorating.

  In the case of the first embodiment, the relief valve 100 has the above-described configuration, is disposed on the crankcase along the z-axis direction, and has a cylinder shape having a central axis parallel to the z-axis. . Accordingly, the relief valve 100 has a circular cross section shown on the xy plane as shown in FIG. In the case of a circular cross section, each coordinate system is more useful than a rectangular coordinate system. Therefore, in the case of the present embodiment, each coordinate system is required as necessary when the cross section shown on the xy plane is used as a reference. Will be described as a reference.

  Accordingly, the relief valve 100 according to the first embodiment includes a circular discharge space (S), a circular flame barrier layer 60 that limits the discharge space, the lid 20, and the gate 30, and the discharge space (S). It is fixed to the upper part of the crankcase by a plurality of fixing members 50 arranged along the circumference. Therefore, the flame cutoff unit 60 is disposed to have a predetermined thickness along the radial direction of the circular cross section shown in FIG. 4, and the flame cutoff unit and the heat transfer unit are arranged along the radial direction of the valve. Are alternately stacked.

Hereinafter, the flame barrier layer 60 will be described in more detail.
FIG. 5 is a view showing the flame barrier layer shown in FIG. 6 is a diagram showing a flame blocking part of the flame barrier layer shown in FIG. 5, and FIG. 7 is a diagram showing a heat transfer part of the flame barrier layer shown in FIG.

Referring to FIGS. 5, 6, and 7, the flame barrier layer 60 includes a plurality of flame blocking portions 61 and heat transfer portions 62 that are alternately stacked along the radial direction of the valve.
In one embodiment, the flame blocking unit 61 includes a metal strap having a plurality of through holes 61a, and the heat transfer unit 62 includes a metal net disposed in a space between the adjacent metal straps. Including.

  For example, the metal strap includes a metal material having excellent thermal conductivity and heat resistance. The plurality of through-holes 61a formed in adjacent metal straps have a constant angle from the center of the bulb and are arranged in a line along the radial direction, and are stored in the exhaust space at a high temperature. A discharge passage (P) for discharging the gas to the outside is formed.

  Therefore, by appropriately adjusting the diameter (d1) of the through hole 61a, it is possible to prevent the high-temperature flame from being discharged to the outside together with the exhaust gas. For example, all through holes can be formed with a diameter that can prevent flame discharge and minimize the flow resistance of the exhaust gas, and the diameter can be reduced stepwise along the radial direction. It can also be configured such that the diameter of the through hole of the metal strap disposed at the outermost part of the flame blocking part is minimized. That is, the discharge passage (P) can be formed in a cylinder shape or a taper shape along the radial direction of the valve 100.

  In the case of the present embodiment, the sum of the cross-sectional areas of the through holes 61a disposed on the metal strap disposed on the innermost side of the bulb 100 is the same even if it is smaller than the cross-sectional area of the opening 10a of the base 10 or Configure to be larger.

  The exhaust gas flows along the discharge passage (P), transfers heat to the metal strap, is sufficiently cooled, and is discharged to the outside. A heat transfer unit 62 for assisting cooling of exhaust gas flowing through the flame blocking unit is disposed between the flame blocking units 61 adjacent to each other. For example, as shown in FIG. 7, the heat transfer unit includes a metal net that connects metal wires having excellent thermal conductivity and heat resistance. The metal wire has a diameter small enough not to sufficiently disturb the flow of the exhaust gas through the discharge path (P).

  Therefore, by disposing the heat transfer unit 62 between the adjacent flame blocking units 61, the flame blocking units are prevented from coming into surface contact with each other, and are spaced apart from each other. To do. Accordingly, it is possible to prevent the discharge path from being blocked even if the through holes 61a of the flame blocking portions 61 adjacent to each other are not aligned. As a result, the pressure reducing characteristic of the relief valve can always be kept constant.

  In particular, a plurality of spacers 63 are disposed along the z-axis between the flame blocking unit 61 and the heat transfer unit 62, and a space between adjacent flame blocking units can be further ensured. . For example, the spacer 63 is configured to alternately contact the inner side surface and the outer side surface of the heat transfer unit 62 along the z axis, and the heat transfer unit 62 has a waveform along the z axis direction. Arrange so that Accordingly, the efficiency of heat transfer can be improved by maximizing the contact area between the exhaust gas and the heat transfer unit 62.

In another embodiment, the flame blocking part 61 may further include a protrusion for securing a space between adjacent metal straps.
FIG. 8 is a view showing a modified embodiment of the flame blocking portion shown in FIG. 6, and FIG. 9 is a view showing a structure in which the flame blocking portions shown in FIG. 6 are stacked. FIG. 10 is a configuration diagram illustrating a flame barrier layer including the flame blocking unit illustrated in FIG. 8.

  Referring to FIGS. 8 to 10, the flame blocking part 61 further includes a protrusion 61 b protruding from the surface of the metal strap including the through hole 61 a by a predetermined height. Accordingly, when a plurality of the metal straps are stacked along the radial direction of the bulb 100, the adjacent metal straps are separated from each other by the protrusions 61b. Therefore, even if the heat transfer portion is not disposed between the metal straps, adjacent metal straps can ensure a predetermined space without being in surface contact with each other.

  Therefore, the flame barrier layer 60 can easily secure a space between the adjacent flame blocking portions by the protrusion 61b. Accordingly, it is possible to prevent the discharge path (P) from being closed by the surface contact of the flame blocking portion.

  According to the flame barrier layer 60 as described above, the flame blocking part 61 having the metal strap having the through hole 61a and the heat transfer part 63 having the metal net are alternately arranged along the radial direction of the valve 100. To do. Accordingly, by ensuring a sufficient space inside the flame barrier layer, it is possible to prevent the valve from depressurizing due to the closing of the discharge path (P).

FIG. 8 is a view showing a method for manufacturing the flame barrier layer shown in FIG.
Referring to FIG. 8, a punching process is performed on the surface of the metal strap to form a first strap 91 having a plurality of through holes 61 a and forming a flame blocking part 61. The second strap 92, which is formed of a metal net connected with a metal wire and forms the heat transfer portion 62, is wound around the second roller (B). The first strap 91 and the second strap 92 unwound from the first and second rollers (A, B) are guided to the coupling unit 14 through the first guide 13a and the second guide 13b, respectively. The coupling unit 14 forms the integrated strap 93 by bonding the second strap to the surface of the first strap by various crimping means. For example, the metal net is integrally coupled to the surface of the porous metal strap by the coupling unit 14 to form the integral strap 93. The integral strap 93 is guided and wound around the third roller (C). Therefore, the integrated strap 93 forms a flame barrier layer 60 in which the flame blocking portions 61 and the heat transfer portions 62 are alternately stacked along the radial direction of the third roller (C).

  When the integrated strap 93 is wound around the third roller (C) so as to have a predetermined thickness, the metal strap and the metal net are cut and a brazing process is performed on the cut portion to form a cylindrical flame. The barrier layer 60 is completed.

  Therefore, by forming the flame barrier layer integrally including the flame blocking portion and the heat transfer portion in a single step, time and cost for manufacturing the flame barrier layer can be reduced. In particular, the protrusion can be formed without a separate additional step by forming a recess for forming the protrusion 61b in the press mold for forming the through hole 61a.

  12 is a sectional view of an internal combustion engine relief valve according to a second embodiment of the present invention, and FIG. 13 is a plan view of the internal combustion engine relief valve shown in FIG. The relief valve 200 for an internal combustion engine according to this embodiment has the same configuration as the relief valve 100 shown in FIG. 3 except for a flame barrier layer 70 for exhausting and cooling exhaust gas. Therefore, the same components as those of the relief valve 100 shown in FIG. 3 perform the same functions, are given the same reference numerals, and detailed descriptions thereof are omitted.

  Referring to FIGS. 12 to 13, a relief valve 200 for an internal combustion engine according to a second embodiment of the present invention includes a base 10 having an opening 10a communicating with the inside of a crankcase (not shown) of the internal combustion engine. A lid 20 disposed on the top of the base 10; connected to the gate 30, the lid 20 and the gate 30 for selectively opening or closing the opening 10a to block inflow of exhaust gas to the relief valve; A gate adjusting member 40 for selectively controlling the movement of the gate 30 and a flame barrier layer 70 for removing and cooling the exhaust gas flame are included.

  When the high temperature gas is discharged from the discharge space (S) to the outside, the flame barrier layer 70 is configured to block a flame from being transmitted to the outside of the relief valve 200 along the discharge gas. And a heat transfer part for absorbing heat of the exhaust gas. At this time, the flame blocking portion and the heat transfer portion may be alternately stacked along the height direction of the flame barrier layer 70 to sufficiently secure a space between the adjacent flame blocking portions. it can. Accordingly, it is possible to prevent the pressure reduction characteristics of the valve 200 from deteriorating due to the absence of the discharge passage formed between the flame blocking portions.

  Also in the case of the second embodiment, the relief valve 200 is disposed on the crankcase in the z-axis direction and has a cylindrical shape having a central axis parallel to the z-axis, as in the first embodiment. Accordingly, the relief valve 200 has a circular cross section shown on the xy plane as shown in FIG. In the case of a circular cross section, each coordinate system is more useful than a rectangular coordinate system. Therefore, in the case of the present embodiment, each coordinate system is required as necessary when the cross section shown on the xy plane is used as a reference. Will be described as a reference.

  Accordingly, the relief valve 200 according to the second embodiment includes a circular discharge space (S), a circular flame barrier layer 70 that limits the discharge space, the lid 20, and the gate 30, and the discharge space (S). It is fixed to the upper part of the crankcase by a plurality of fixing members 50 arranged along the circumference. Therefore, the flame blocking unit 70 is disposed to have a predetermined thickness along the radial direction of the circular cross section shown in FIG. 13, and the flame blocking unit and the heat transfer unit are arranged in the axial direction of the valve 200. Are alternately stacked along the z-axis.

Hereinafter, the flame barrier layer 70 included in the relief valve 200 according to the present embodiment will be described in detail.
FIG. 14 is a view showing the flame barrier layer shown in FIG.
Referring to FIG. 14, the flame barrier layer 70 includes a plurality of flame blocking portions 71 and heat transfer portions 72 that are alternately stacked along the z-axis that is the axial direction of the valve.

  In one embodiment, the flame blocking part 71 includes a plurality of bent metal straps each having a plurality of convex parts 71a and concave parts 71b, and the heat transfer part 72 is provided between the bent metal straps adjacent to each other. A plurality of metal nets disposed in the separated space.

  In one embodiment, the metal strap is laminated so that the convex portions 71a and the concave portions 71b correspond to each other along the z-axis direction, and between the flame shielding portions 71 laminated so as to be adjacent to each other. A discharge path (P) having a certain width and bending along the radial direction of the valve 200 is formed. For example, the metal straps may be arranged such that the protrusions 71a of the metal straps are arranged in a line along a first line, and the recesses 71b of the metal straps are arranged in a line along a second line. Arranged along the central axis, the discharge path is formed as a corrugated space between adjacent metal straps, and the metal net is disposed on the discharge path.

  That is, the plurality of metal straps are stacked such that the convex portion of the second strap is positioned below the convex portion of the first strap and the concave portion of the second strap is positioned below the concave portion of the first strap. Thus, a discharge path (P) having a certain size can be formed along the radial direction of the valve 200. Therefore, by forming a discharge path bent with a constant amplitude along the radial direction of the valve 200, it is possible to block the discharge of the flame from the discharge space (S). At this time, the size of the discharge path (P) can be appropriately adjusted by adjusting the stacking interval of the flame blocking portions 71.

The exhaust gas flows along the discharge path (P), transfers heat to the metal strap and is sufficiently cooled, and then is discharged to the outside.
A heat transfer unit 72 for assisting cooling of the exhaust gas flowing along the discharge path (P) is disposed between the flame blocking units 71 adjacent to each other. That is, the heat transfer part 72 is disposed on the discharge path (P) so as to be parallel to the flow direction of the exhaust gas. For example, the heat transfer unit 72 includes a metal net that connects metal wires having excellent heat conductivity and heat resistance. The metal wire has a small diameter that does not sufficiently interfere with the exhaust gas flow through the discharge path (P), and maximizes the contact area with the exhaust gas.

  By disposing the heat transfer part 72 between the flame blocking parts 71 adjacent to each other, the flame blocking parts 71 are prevented from coming into surface contact with each other and can be separated from each other. Accordingly, the discharge path (P) formed in the space between the flame blocking portions 71 can be prevented from being closed, and the pressure reducing characteristic of the relief valve 200 can be maintained constant.

  In particular, a plurality of spacers 73 are alternately arranged along the radial direction of the valve 200 on the upper surface and the lower surface of the heat transfer unit 72, and the heat transfer unit 72 has a waveform along the radial direction of the valve 200. Arrange so that Accordingly, the heat transfer efficiency can be improved by maximizing the contact area between the exhaust gas and the heat transfer unit 72.

  In another embodiment, the flame blocking unit 71 includes a plurality of metal pieces connected in a chain through a joint instead of a metal strap integrally including a plurality of protrusions and recesses.

  FIG. 15 is a view showing a modified embodiment of the flame barrier layer shown in FIG. In FIG. 15, the heat transfer part 72 which comprises the said flame barrier layer 70 is the same as FIG. 14, and only the structure of the heat interruption part 78 is different. Therefore, further description of the heat transfer portion will be omitted, and only the heat blocking portion 78 will be described in detail.

  Referring to FIG. 15, the heat blocking part 78 includes a connecting part 78b for connecting a plurality of metal pieces 78a and end portions of the metal piece 78a to form a metal chain. The metal piece 78a is formed of a flat plate, and the pair of metal pieces connected by the connecting portion 78b is disposed so as to pass through the connecting portion 78b and be symmetric with respect to a connecting axis parallel to the z axis. The Accordingly, the plurality of metal pieces 78a connected in a chain by the plurality of connection portions 78b includes a plurality of convex portions and concave portions. Since the arrangement of the plurality of heat blocking portions 78 having the convex portions and the concave portions is the same as the arrangement of the heat blocking portions 71 shown in FIG. 13, detailed description thereof is omitted.

  According to the flame barrier layer 70 as described above, the metal strap and the metal net having a plurality of convex portions and concave portions are alternately arranged along the axial direction of the valve 200. Accordingly, it is possible to prevent a valve from being decompressed poorly due to the closing of the discharge path (P) by sufficiently securing a space between the flame barrier layers.

FIG. 16 is a diagram showing a method for manufacturing the flame barrier layer shown in FIG.
Referring to FIG. 16, a metal strap having a plurality of convex portions and concave portions, in which a first strap 95 forming the flame blocking portion 71 is wound around a first roller (A), and a metal wire is tied. A second strap 96 formed of a net and forming the heat transfer portion 72 is wound around the second roller (B). The first stop 95 and the second strap 96 which are unwound from the first and second rollers (A, B) are guided to the coupling unit 14 through the first guide 13a and the second guide 13b. The coupling unit 14 forms the integrated strap 97 by bonding the second stop to the surface of the first strap by various crimping means. For example, the metallic net is integrally coupled to the surface of the porous metal strap by the coupling unit 14 to form the integral strap 97. The integrated strap 97 is converted from a vertical strap to a horizontal strap by the conversion portion 15. Subsequently, the integrated strap 97 is guided and wound up by the third roller (C). Therefore, the integrated strap 97 has the flame barrier layer in which the flame blocking portions 71 and the heat transfer portions 72 are alternately stacked from the bottom to the top along the direction of the rotation axis of the third roller (C). 70 is formed.

  When the integrated strap 97 is wound around the third roller (C) so as to have a predetermined thickness, the metal strap and the metal net are cut, and a brazing process is performed on the cut portion. The flame barrier layer 70 is completed.

  Therefore, it is possible to reduce the time and cost for manufacturing the flame barrier layer by forming the flame barrier layer integrally including the flame blocking portion and the heat transfer portion by a single process.

  17 is a sectional view of an internal combustion engine relief valve according to a third embodiment of the present invention, and FIG. 18 is a plan view of the internal combustion engine relief valve shown in FIG. The relief valve 300 for an internal combustion engine according to this embodiment has the same configuration as the relief valve 100 shown in FIG. 3 except for a flame barrier layer 80 for exhausting and cooling exhaust gas. Accordingly, the same components as those of the relief valve 100 shown in FIG. 2 perform the same functions, are given the same reference numerals, and will not be described in further detail.

  17 and 18, a relief valve 300 for an internal combustion engine according to a second embodiment of the present invention includes a base 10 having an opening 10a communicating with the inside of a crankcase (not shown) of the internal combustion engine. The lid 20 disposed on the upper part of the base 10 is connected to the gate 30, the lid 20 and the gate 30 which selectively opens or closes the opening 10a and blocks the inflow of exhaust gas to the relief valve. A gate adjusting member 40 for selectively controlling the movement of the gate 30 and a flame barrier layer 80 for removing and cooling the exhaust gas flame are included.

  At this time, the flame barrier layer 80 includes a first barrier layer 80a disposed adjacent to the discharge space (S), a buffer space 80b for increasing the size of the flame barrier layer 80, and the buffer space. A second barrier layer 80c surrounding 80b is included.

  Since each structure of the said 1st and 2nd barrier layer is the same as the flame barrier layer 80 disclosed by the 1st Example, the detailed description beyond this is abbreviate | omitted. Preferably, the fixing member 50 for fixing the relief valve 300 to the crankcase is a first fixing member 50a disposed along the discharge space (S) and a second fixing member disposed along the buffer space 80b. 50b. Accordingly, the fixing and sealing between the valve 300 and the crankcase can be improved.

  The exhaust gas stored in the exhaust space (S) is first exhausted in the buffer space (80b) through the first exhaust path (P1) formed in the first barrier layer (80a), and the buffer space. The exhaust gas stored in (80b) is exhausted to the outside through the second exhaust path (P2) formed in the second barrier layer 80c. Accordingly, the exhaust gas is discharged to the outside through a two-stage discharge process. A relief valve applied to a large internal combustion engine used for a large structure such as a ship or an aircraft has a large amount of exhaust gas and flame discharged by one explosion process. The capacity of the valve can be easily increased. Also, by arranging a plurality of flame barrier layers that are applied to a small internal combustion engine in parallel, a flame barrier layer that can be easily applied to a large internal combustion engine may be formed, thereby eliminating the complexity of the process. it can.

  In the present embodiment, the formation of the buffer space 80b in the relief valve 100 disclosed in the first embodiment is exemplarily disclosed. However, the relief valve 200 disclosed in the second embodiment is also described in detail. It is obvious that such a buffer space can be formed.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes and modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  According to the relief valve for an internal combustion engine according to an embodiment of the present invention, the flame blocking portions are disposed so as to be sufficiently separated from each other, so that the separation space is stably secured, and the heat transfer portion is provided inside the separation space. Deploy. As a result, the discharge path of the flame barrier layer is stably formed, and the electric heating area with the exhaust gas is increased, so that the pressure reducing performance of the relief valve is not adversely affected and the exhaust gas can be effectively cooled. it can.

  Further, by integrally forming the flame blocking part and the heat transfer part constituting the flame barrier layer by a single process, the manufacturing process of the relief valve can be simplified and the cost can be reduced. In particular, by forming a protrusion formed on the surface of the flame blocking portion and maintaining the interval between the flame blocking portions at the same time in the formation process of the flame barrier layer, a stable discharge path can be achieved without any additional steps. Can be formed.

  DESCRIPTION OF SYMBOLS 10 ... Base, 10a ... Opening, 20 ... Cover, 30 ... Gate, 40 ... Gate adjustment member, 50 ... Fixing member, 60, 70, 80 ... Flame barrier layer, 100, 200, 300 ... Relief valve for internal combustion engines.

Claims (22)

A flame barrier layer for a relief valve that discharges high-temperature gas supplied from a crankcase of an internal combustion engine through a number of discharge paths, removes the flame, and lowers the temperature to the outside.
Adjacent metal straps comprising a large number of metal straps having heat conductivity and heat resistance and a number of metal meshes having the same heat conductivity and heat resistance, wherein the metal straps and the metal nets are alternately laminated one by one. A flame barrier layer for a relief valve, characterized in that they are separated from each other to form a separation space.   The metal strap has a first surface and a second surface facing each other, and a plurality of spacers are alternately arranged on the first surface and the second surface along the metal strap. The flame barrier layer for relief valves according to 1.   The flame barrier layer for a relief valve according to claim 1, wherein the metal strap includes a plurality of through holes.   The flame barrier layer for a relief valve according to claim 1, wherein the metal strap is a bent metal strap having a plurality of convex portions and concave portions.   The bent metal strap includes a plurality of connecting portions that connect a plurality of metal pieces and respective end portions of the metal pieces to form a metal chain, and the pair of metal pieces connected to the connecting portions includes: The flame barrier layer for a relief valve according to claim 4, wherein the flame barrier layer is disposed symmetrically with respect to a connecting shaft passing through the connecting portion.   2. The relief valve according to claim 1, wherein the metal strap includes a plurality of protrusions protruding from a surface by a certain height to prevent surface contact between the metal straps adjacent to each other. Flame barrier layer. Winding a first metal strap having thermal conductivity and heat resistance around a first roller to remove a flame when exhausting exhaust gas from an internal combustion engine and to reduce the temperature of the exhaust gas;
Winding a single metal net, also having thermal conductivity and heat resistance, around the second roller to lower the temperature of the exhaust gas;
Joining the metal strap and the metal mesh together to form an integral strap;
The integral type strap is wound around a third roller, the metal strap and the metal net are alternately laminated, and adjacent metal straps are separated from each other to form a separation space. Part forming method.   8. The method for forming a flame shielding part for a relief valve according to claim 7, wherein the integrated straps are alternately stacked along a direction perpendicular to the axial direction of the third roller.   A step of converting the integrated strap before winding the integrated strap around the third roller, wherein the metal strap and the metal net are alternately stacked along the axial direction of the third roller; The method for forming a flame blocking part for a relief valve according to claim 7, comprising: A base fixed to a crankcase of an internal combustion engine and having an opening communicating with the crankcase;
A gate that is movably fixed to the base, selectively opens the opening, and selectively injects hot exhaust gas from the crankcase through the opening;
A large number of metal straps that are disposed on the base so as to surround the opening and have an exhaust path for exhausting the exhaust gas to the outside, and that have thermal conductivity and heat resistance, as well as thermal conductivity and heat resistance A flame barrier layer in which metal straps and metal nets are alternately laminated one by one, and adjacent metal straps are separated from each other to form a separation space;
An internal combustion engine comprising: a lid fixed to an upper surface of the flame barrier layer and disposed at an upper portion of the opening, and forming a discharge space in which the exhaust gas is stored together with the gate and the flame barrier layer. Relief valve.   The metal strap and the metal net are alternately arranged along a thickness direction of the flame barrier layer, and are alternately laminated along a radial direction of the discharge space having a cylinder shape. 10. A relief valve for an internal combustion engine according to 10.   The internal combustion engine according to claim 11, wherein the metal strap includes a plurality of through holes, and the metal barrier and the metal net are alternately arranged along the radial direction in the flame barrier layer. Relief valve.   The plurality of through holes arranged in the metal straps adjacent to each other are arranged in a row along the radial direction to form the discharge path, and the exhaust gas is discharged through the flame barrier layer. The relief valve for an internal combustion engine according to claim 12, wherein the relief valve is used.   The total cross-sectional area of the through-hole formed in the metal strap arranged adjacent to the discharge space is the same as the area of the opening formed in the base. The relief valve for internal combustion engines as described.   The metal strap and the metal net are alternately stacked along a height direction of the flame barrier layer, and are alternately stacked along a central axis of the discharge space having a cylinder shape. 10. A relief valve for an internal combustion engine according to 10.   The metal strap is a bent metal strap having a plurality of convex portions and concave portions, respectively, and the metal barrier and the metal net are alternately arranged along the central axis of the flame barrier layer. The relief valve for an internal combustion engine according to claim 15.   The protrusions of the metal straps are arranged in a line along the first line, and the recesses of the metal straps are arranged in a line along the second line. 17. The discharge path according to claim 16, wherein the discharge path is formed as a corrugated space between the metal straps adjacent to each other, and the metal net is disposed on the discharge path. Relief valve for internal combustion engine.   The bent metal strap includes a plurality of connecting portions that connect a plurality of metal pieces and respective end portions of the metal pieces to form a metal chain, and the pair of metal pieces connected to the connecting portions includes: The relief valve for an internal combustion engine according to claim 16, wherein the relief valve is disposed symmetrically with respect to a connecting shaft that is parallel to the central axis and penetrates the connecting portion.   The metal strap further includes a plurality of protrusions protruding from a surface by a certain height, and the metal net further includes a spacer for securing a space from an adjacent metal strap. 10. A relief valve for an internal combustion engine according to 10.   The relief valve for an internal combustion engine according to claim 10, further comprising a gate adjusting member that controls the opening of the gate by the pressure of the exhaust gas.   21. The relief valve for an internal combustion engine according to claim 20, wherein the gate adjusting member includes an elastic member connected to the lid and the gate.   The flame barrier layer includes a first barrier layer surrounding the discharge space and a second barrier layer surrounding the first barrier layer, and a buffer space is provided between the first barrier layer and the second barrier layer. The relief valve for an internal combustion engine according to claim 10.

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