Cover device for supercharger, method for operating engine system, and method for installing cover device for supercharger

Abstract

A turbocharger shroud device is disclosed for use in a turbocharger driven by exhaust gas generated from the combustion of a fuel that is lighter than air in its gaseous state. The turbocharger includes: a turbine housing for exhaust gas inflow; a compressor housing for intake gas inflow; and a muffler connected to the compressor housing for reducing noise generated when intake gas is introduced from the surrounding environment. The turbocharger shroud device includes a shroud that covers at least a portion of the turbine housing from above, defining a gaseous fuel retention space between the shroud and the turbine housing for the retention of gaseous fuel in the event of leakage. The turbocharger shroud device is configured to introduce the gaseous fuel retention space into the muffler side via the negative pressure of the compressor.

Description

Technical Field

[0001] This disclosure relates to a turbocharger cover device used in a turbocharger driven by exhaust gas generated from the combustion of fuel that is lighter than air in the gaseous state, an engine system having a turbocharger with the turbocharger cover device, and a method for installing the turbocharger cover device.

[0002] This application claims priority based on Japanese Patent Application No. 2025-020306 filed with the Japan Patent Office on February 10, 2025, the contents of which are incorporated herein by reference. Background Technology

[0003] In recent years, with the aim of reducing emissions of carbon dioxide, a representative greenhouse gas, there has been a development to replace traditional fossil fuels with decarbonized fuels that do not produce carbon dioxide even when burned. Patent Document 1 discloses an exhaust system that draws unburned decarbonized fuel (fuel leak gas) leaking from a marine internal combustion engine into the interior of an exhaust pipe located above the marine engine room by a suction fan, and exhausts the gas outside the marine engine room.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2023-171208 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] Engine systems, including engines and turbochargers, sometimes use ammonia or hydrogen as fuels to replace heavy oil. These fuels are lighter than air when vaporized. These fuels are difficult to burn completely in the engine, and the exhaust supplied to the turbocharger sometimes contains unburned components of gaseous fuel vaporized in the engine (hereinafter referred to as gaseous fuel). Furthermore, when gaseous fuel leaks from the turbocharger, there is a possibility of adverse effects on human health and the surrounding environment. However, the exhaust system described in Patent Document 1 does not cover the turbocharger with an exhaust shroud (connecting the interior of the engine compartment to the interior of the exhaust pipe), and gaseous fuel leaking from the turbocharger may diffuse.

[0009] This disclosure was made in view of the above-mentioned problems, and its object is to provide a turbocharger cover device that can suppress diffusion when gaseous fuel leaks from the turbocharger, an operating method of an engine system having a turbocharger equipped with the turbocharger cover device, and a method for installing the turbocharger cover device.

[0010] Solution for solving the problem

[0011] To achieve the above objectives, the turbocharger shroud device disclosed herein is a turbocharger shroud device that can be used in a turbocharger driven by exhaust gas generated from the combustion of a fuel that is lighter than air in a gaseous state. The turbocharger includes: a turbine including a turbine housing for the exhaust gas to flow into; a compressor including a compressor housing for the intake gas to flow into; and a muffler connected to the compressor housing for reducing noise generated when the intake gas is introduced from the surrounding environment. The turbocharger shroud device comprises: a shroud covering at least a portion of the turbine housing from above, and the shroud defining a gaseous fuel retention space between itself and the turbine housing for the retention of gaseous fuel, which is gaseous, in the event of leakage. The turbocharger shroud device is configured to introduce the gas retained in the gaseous fuel retention space into the muffler side by the negative pressure of the compressor.

[0012] Invention Effects

[0013] The turbocharger shroud device according to this disclosure can suppress diffusion when gaseous fuel leaks from the turbocharger. Attached Figure Description

[0014] Figure 1 This is a diagram that roughly illustrates an example of the configuration of an engine system.

[0015] Figure 2 This is a schematic diagram showing the configuration of a turbocharger shroud device and a turbocharger according to one embodiment.

[0016] Figure 3 This is a diagram illustrating the first joint and the second joint in one embodiment.

[0017] Figure 4 This is a diagram illustrating the third joint portion of one embodiment.

[0018] Figure 5 This is a perspective view of a turbocharger cover device according to one embodiment.

[0019] Figure 6 Observing from arrow Z Figure 2 A diagram of the intensifier shroud assembly is shown.

[0020] Figure 7 This is a diagram illustrating the extent to which a cover covers the turbine housing in one embodiment.

[0021] Figure 8 This is a diagram that schematically illustrates the configuration of a turbocharger shroud device according to some embodiments. Detailed Implementation

[0022] Hereinafter, based on the accompanying drawings, a description of an embodiment of the turbocharger cover device, an operating method of an engine system having a turbocharger equipped with the turbocharger cover device, and a method for installing the turbocharger cover device will be provided. This embodiment illustrates one aspect of the present disclosure and does not limit the present disclosure; modifications can be made freely within the scope of the technical concept of the present disclosure.

[0023] <Engine System>

[0024] Figure 1 This is a diagram that roughly illustrates an example of the configuration of the engine system 100. Figure 2 This is a schematic diagram showing the configuration of a turbocharger shroud assembly 1 and a turbocharger 110 according to one embodiment. Figure 1 As illustrated by the example, the engine system 100 includes a turbocharger 110, an engine 150, a control unit 200, and a turbocharger shroud assembly 1 according to one embodiment. Figure 1 In the exemplified manner, the engine system 100 also includes a concentration detection device 210.

[0025] <Supercharger>

[0026] The turbocharger 110 is configured to be driven by exhaust gas G generated by the combustion of fuel FL, which is lighter than air in its gaseous state. The fuel FL is not particularly limited as long as it is lighter than air in its gaseous state; for example, it can be ammonia or hydrogen. In this disclosure, the case where the fuel FL is liquid ammonia is used as an example. It should be noted that this disclosure does not limit the fuel FL to liquid. For example, the fuel FL can also be ammonia or hydrogen.

[0027] like Figure 1 and Figure 2 As illustrated in the example, the turbocharger 110 includes a turbine 112, a compressor 114, a muffler 116, a rotating shaft 118, and a bearing housing 120. In one embodiment, the rotating shaft 118 coaxially connects the turbine 112 (the turbine rotor 122 of the turbine 112) and the compressor 114 (the impeller 140 of the compressor 114), with the rotation axis O1 of the turbine 112 and the rotation axis O2 of the compressor 114 being coaxial.

[0028] Hereinafter, the direction in which the rotation axis O1 of the turbine 112 (the rotation axis O2 of the compressor 114) extends is defined as the axial direction D1, the direction orthogonal to the axial direction D1 and extending from the rotation axis O1 is defined as the radial direction D2, and the direction of rotation about the rotation axis O1 is defined as the circumferential direction D3. The direction in the axial direction D1 from the turbine 112 side towards the compressor 114 side (…) Figure 2 The direction from top to bottom on the paper is set as one side of the axis direction D1, and the direction from the compressor 114 side toward the turbine 112 side ( Figure 2 Let the direction from bottom to top in the paper be the other side of the axis direction D1. Let the direction in radial D2 toward the rotation axis O1 be the inside of radial D2, and let the direction away from the rotation axis O1 be the outside of radial D2.

[0029] The turbine 112 is driven by the rotation of exhaust gas G supplied from the engine 150. For example... Figure 2 As illustrated by the example, turbine 112 includes: turbine rotor 122, which rotates by the energy of exhaust gas G; and turbine housing 124, into which exhaust gas G flows, and configured to house turbine rotor 122 for rotation. In one embodiment, turbine 112 is a radial turbine. In some embodiments, turbine 112 is an axial turbine.

[0030] The turbine housing 124 is connected to an inlet pipe 160 through which the exhaust gas G flows into the turbine housing 124 and an outlet pipe 162 through which the exhaust gas G flows out of the turbine housing 124. The turbocharger 110 has a first joint portion 125 that serves as the part connecting the turbine housing 124 and the inlet pipe 160 and a second joint portion 127 that serves as the part connecting the turbine housing 124 and the outlet pipe 162.

[0031] Figure 3 This is a diagram illustrating the first joint portion 125 and the second joint portion 127 of one embodiment. (See diagram) Figure 3 As illustrated in the example, the turbine housing 124 includes: an inlet-side flange surface 130 with an inlet 121 for supplying exhaust gas G; and an outlet-side flange surface 132 with an outlet 123 for supplying exhaust gas G. An exhaust flow path 131 is formed within the turbine housing 124, allowing exhaust gas G to flow sequentially through the inlet 121, the turbine rotor 122, and the outlet 123. A first joint 125 is formed by the inlet-side flange surface 130 abutting against the flange surface 164 of the turbine housing 124 side of the inlet pipe 160. A second joint 127 is formed by the outlet-side flange surface 132 abutting against the top surface 166 of the turbine housing 124 side of the outlet pipe 162. The second joint 127 is located on the side opposite to the first joint 125 in the axial direction D1. In one embodiment, to suppress interference with the turbocharger shroud assembly 1, the first joint 125 is located below the rotation axis O1.

[0032] The turbine housing 124 is connected to the bearing housing 120. The turbocharger 110 has a third joint 129, which serves as the part where the turbine housing 124 and the bearing housing 120 are connected. Figure 4 This is a diagram illustrating the third joint 129 in one embodiment. (See diagram below.) Figure 4As illustrated, the turbine housing 124 includes a vortex portion 134 that defines a vortex-shaped flow path 133, which is part of the exhaust flow path 131 and is used to guide exhaust gas G to the turbine rotor 122. A third joint portion 129 is formed by the turbine-side connecting surface 136 on the other side of the bearing housing 120 in the axial direction D1 abutting against the wall surface 138 on one side of the vortex portion 134 of the turbine housing 124 in the axial direction D1.

[0033] As described above, compressor 114 is connected to turbine 112 via rotating shaft 118. The power of the rotating turbine 112 is transmitted via rotating shaft 118 to compress the intake air A of engine 150. Figure 2 As illustrated, compressor 114 includes: an impeller 140 coaxially connected to turbine rotor 122 via a rotating shaft 118, and driven by the rotation of turbine rotor 122 to compress intake gas A; and a compressor housing 142 for intake gas A to flow into and for housing the impeller 140. Compressor housing 142 is connected to bearing housing 120 and is located on the opposite side of turbine housing 124 in the axial direction D1, across bearing housing 120. In one embodiment, compressor 114 is a centrifugal compressor.

[0034] like Figure 2 As illustrated, the silencer 116 is connected to one side of the compressor housing 142 along the axial direction D1. The silencer 116 is secured to the compressor housing 142. The silencer 116 has a cylindrical shape and extends along the axial direction D1. When the impeller 140 rotates, the silencer 116 draws in intake air A from its outer peripheral side (outside the radial direction D2). Then, the intake air A drawn into the silencer 116 flows into the compressor housing 142. The silencer 116 reduces the sound generated when intake air A is introduced from its periphery through internal silencer elements (sound absorbers).

[0035] like Figure 2 As illustrated, a bearing housing 120 is disposed between the turbine 112 and the compressor 114, housing a bearing 144 that supports a rotating shaft 118 for rotation, the rotating shaft 118 connecting the turbine rotor 122 of the turbine 112 to the impeller 140 of the compressor 114. The bearing housing 120 is positioned at the center of gravity of the supercharger 110 in the axial direction D1. The bearing housing 120 rests on a base plate surface g, which serves as a mounting surface on the engine, and constitutes at least a portion of the load supporting the supercharger 110.

[0036] <engine>

[0037] Engine 150 is configured to perform fuel combustion operation, which burns fuel FL, and exhausts exhaust gas G by performing fuel combustion operation. Figure 1In the illustrated embodiment, engine 150 includes a gas cylinder 152 with a combustion chamber 151 internally formed therein, and a fuel injection device 154 for injecting fuel FL into the combustion chamber 151. Engine 150 is configured to allow intake air A, compressed by turbocharger 110, to flow into the combustion chamber 151. The intake air A flowing into the combustion chamber 151 mixes with the fuel FL injected from the fuel injection device 154. Furthermore, engine 150 is configured to perform diesel operation, in addition to fuel combustion operation, by burning diesel fuel DF. In one embodiment, the fuel injection device 154 injects diesel fuel DF instead of gaseous fuel F.

[0038] <Control Device>

[0039] Control device 200 controls the operation of engine 150. Figure 1 In the illustrated embodiment, the control device 200 is electrically connected to the engine 150, instructing the engine 150 to operate in fuel combustion mode or in diesel mode. The engine 150 operates in fuel combustion mode or in diesel mode according to the instructions of the control device 200. This control device 200 is a computer such as an electronic control device, for example, equipped with a processor such as a CPU (Central Processing Unit) or GPU (Graphics Processing Unit), memory such as ROM (Read Only Memory) or RAM (Random Access Memory), and I / O (Input / Output) interfaces. The control device 200 causes the processor to perform actions (such as calculations) according to the instructions of the program loaded in memory, thereby realizing the various functional units of the control device 200.

[0040] <Concentration Detection Device>

[0041] Concentration detection device 210 detects the concentration (ammonia concentration) of gaseous fuel F within the gaseous fuel retention space 3 (described later). Figure 1 In the exemplified manner, the control device 200 is electrically connected to the concentration detection device 210, and can obtain the concentration of gaseous fuel F in the gaseous fuel retention space 3 from the concentration detection device 210.

[0042] <Supercharger Cover Device>

[0043] (constitute)

[0044] A turbocharger shroud device 1 according to one embodiment will be described. For example... Figure 2 As shown, the turbocharger cover assembly 1 includes a cover 2 that covers at least a portion of the turbine housing 124 from above. Figure 5This is a perspective view of cover 2 according to one embodiment. Cover 2 is formed, for example, by processing a metal sheet such as aluminized zinc steel sheet or iron sheet. As a specific example, cover 2 is a welded structure formed by welding metal sheets. In one embodiment, such as Figure 5 As illustrated in the example, the cover 2 has a curved shape that protrudes in one direction and curves convexly in a manner that smoothly changes its external shape. It should be noted that this disclosure does not limit the external shape of the cover 2 to a curved shape.

[0045] In one implementation, such as Figure 2 As shown, the cover 2 includes a base end 2a located on the side opposite to the turbine housing 124 in the axial direction D1. The cover 2 extends from the base end 2a toward the side in the axial direction D1, defining a gaseous fuel retention space 3 between itself and the turbine housing 124 for retaining gaseous fuel F leaking from the turbocharger 110.

[0046] The turbocharger shroud assembly 1 is configured to introduce gas Ax retained in the gaseous fuel retention space 3 into the muffler 116 side via the negative pressure of the compressor 114. In one embodiment, the shroud 2 includes a top end 2b located in the axial direction D1, overlapping with the muffler 116. The shroud 2 extends from the base end 2a on the turbine housing 124 side toward the top end 2b on the muffler 116 side, covering at least a portion of the muffler 116 from above. That is, the top end 2b of the shroud 2 is located directly above the muffler 116 or radially outside the muffler 116 by a distance of D2. The shroud 2 covers the entire turbine housing 124, the entire bearing housing 120, the entire compressor housing 142, and a portion of the muffler 116 from above in the axial direction D1.

[0047] In one implementation, such as Figure 2 As shown, the cover 2 includes a base-end side fold-back portion 4 extending inward from the base end 2a toward the radial direction D2 and a top-end side fold-back portion 6 extending inward from the top end 2b toward the radial direction D2. The base-end side fold-back portion 4 and the top-end side fold-back portion 6 are integrally formed with the cover 2. In one embodiment, the cover 2 is mounted to the bearing housing 120 via a support member 40. As described above, the bearing housing 120 is located at the center of gravity of the turbocharger 110 in the axial direction D1 and is in contact with the bottom plate surface g, thus being a less vibrating part of the turbocharger 110. The support member 40 is, for example, a rod-shaped member extending outward from the bearing housing 120 toward the radial direction D2.

[0048] Figure 6 Viewed from the side opposite to arrow Z (axis direction D1). Figure 2 The diagram shows the turbocharger enclosure 1 (enclosure 2 and insulation layer 10). In one embodiment, as... Figure 6As shown, the cover 2, when viewed from the axial direction D1, covers the entire upper side 124a of the turbine housing 124 from above. In some embodiments, the cover 2, when viewed from the axial direction D1, covers only a portion of the upper side 124a of the turbine housing 124 from above.

[0049] Figure 7 This is a diagram illustrating the extent to which the cover 2 covers the turbine housing 124 in one embodiment, and is a view of the cover 2 from above. In one embodiment, as... Figure 7 As illustrated in the example, the cover 2 covers more than 10% of the length L of the muffler 116 in the axial direction D1 from above. More specifically, the cover 2 covers more than 10% and less than 50% of the length L of the muffler 116 in the axial direction D1 from above. In some embodiments, the cover 2 covers more than 10% and less than 90% of the length L of the muffler 116 in the axial direction D1 from above.

[0050] In one implementation, such as Figure 7 As shown, when viewed from above, the turbine housing 124, bearing housing 120, and compressor housing 142 are respectively positioned within the area 5 surrounded by the cover 2 (in... Figure 7 The area enclosed by the double-dotted line is within the range 5. A portion of the silencer 116 is contained within the range 5 enclosed by the cover 2.

[0051] In one implementation, such as Figure 7 As shown, the cover 2 covers the entirety of the first seam 125, the entirety of the second seam 127, and the entirety of the third seam 129 from above. In some embodiments, the cover 2 covers at least one of the entirety of the first seam 125, the entirety of the second seam 127, and the entirety of the third seam 129 from above.

[0052] In one implementation, such as Figure 2 As shown, the top surface 8 of the cover 2 facing the gas fuel retention space 3 has an inclined surface that slopes upwards from the turbine housing 124 side toward the muffler 116 side. The entire top surface 8 from the base end 2a to the top end 2b is an inclined surface. In some embodiments, at least a portion of the top surface 8 is an inclined surface.

[0053] In one implementation, such as Figure 2As shown, the turbocharger shroud assembly 1 also includes a heat insulation layer 10 located radially D2 inside the shroud 2 and surrounding the turbine housing 124. An upward-opening opening 11 is formed in the heat insulation layer 10. The opening 11 can be a slit dividing the heat insulation layer 10 or a hole. The material of the heat insulation layer 10 is not particularly limited; it can be a rigid heat insulation layer made of a hard material such as metal, or a soft heat insulation layer made of a soft material such as glass wool.

[0054] (Function, effect)

[0055] The function and effects of a turbocharger shroud device 1 according to one embodiment will be explained. High-temperature exhaust gas G (approximately 400 to 600 degrees Celsius) from the engine 150 flows into the turbine housing 124 in the turbocharger 110, but the temperature of the exhaust gas G drops (approximately 200 to 300 degrees Celsius) as it exits the turbine housing 124. Therefore, the turbine housing 124 experiences significant changes in length and volume due to thermal expansion, potentially leading to leakage of the exhaust gas G. In particular, leakage of the exhaust gas G is highly likely to occur at the locations where the first joint 125, the second joint 127, and the third joint 129 are formed. Furthermore, gaseous fuel F, formed from the vaporization of unburned fuel FL in the engine 150, may sometimes mix into the exhaust gas G. That is, gaseous fuel F (ammonia) may leak from the turbine 112.

[0056] According to one embodiment, the shroud 2 covers the entire turbine housing 124 from above, so that even if gaseous fuel F leaks from the turbine 112, it will be retained in the gaseous fuel retention space 3, for example, preventing the gaseous fuel F from diffusing into the external space 180 of the turbocharger 110 (other than the gaseous fuel retention space 3), such as the engine compartment. Furthermore, the shroud 2 covers a portion of the muffler 116, so that the gaseous fuel F in the gaseous fuel retention space 3 can be introduced into the muffler 116 as intake air A through the negative pressure of the compressor 114 and burned in the engine 150. That is, exhaust gas including gaseous fuel F is recirculated. Therefore, when gaseous fuel F leaks from the turbocharger 110, its diffusion into the external space 180 can be suppressed.

[0057] It should be noted that this disclosure is not limited to the cover 2 covering a portion of the muffler 116 from above. As long as the unburned gaseous fuel F in the gaseous fuel retention space 3 can be introduced into the muffler 116 by the negative pressure of the compressor 114, the top end 2b of the cover 2 can also be located on the other side of the muffler 116 in the axial direction D1.

[0058] According to one embodiment, the cover 2 extends from the turbine housing 124 side toward the muffler 116 side in such a way that it covers more than 10% of the length of the axial direction D1 in the muffler 116 from above. Therefore, without the need for additional components other than the cover 2, most of the gas Ax retained in the gas fuel retention space 3 can be introduced into the muffler 116.

[0059] According to one embodiment, the cover 2 covers from above a portion of the muffler 116 that is 10% to 50% of the length of the axial direction D1. Therefore, the amount of intake air A introduced from the external space 180 can be ensured to be a certain level or more. The intake air A introduced from the external space 180 is at a lower temperature than the gas Ax retained in the gaseous fuel retention space 3. Therefore, the rise in intake air temperature caused by the gas Ax retained in the gaseous fuel retention space 3 can be suppressed, and most of the gas Ax retained in the gaseous fuel retention space 3 can be introduced into the muffler 116.

[0060] According to one embodiment, the top surface 8 of the cover 2 is an inclined surface, so that the gaseous fuel F (ammonia) in the gaseous fuel retention space 3 can move toward the silencer 116 along the top surface 8.

[0061] According to one embodiment, the turbocharger shroud device 1 includes a heat insulation layer 10, so that even if high-pressure gaseous fuel F leaks from the turbine 112, it can be depressurized to, for example, atmospheric pressure through the heat insulation layer 10. Moreover, an opening 11 is formed in the heat insulation layer 10, so that the leaked gaseous fuel F can be depressurized and guided to the gaseous fuel retention space 3.

[0062] According to one embodiment, the entire first joint 125, the entire second joint 127, and the entire third joint 129, which are most likely to leak gaseous fuel F, are each covered from above by a cover 2. Therefore, the diffusion of gaseous fuel F leaking from the turbocharger 110 into the external space 180 can be suppressed.

[0063] According to one embodiment, the cover 2 covers the entire upper side 124a of the turbine housing 124 from above. That is, the lower side of the turbine housing 124 is open to the external space 180, thus allowing heat dissipation to the external space 180 (suppressing the temperature rise of the turbocharger 110) and suppressing the diffusion of gaseous fuel F into the external space 180. According to one embodiment, the cover 2 includes a base-end fold-back portion 4 and a top-end fold-back portion 6, thus suppressing the diffusion of gaseous fuel F into the external space 180.

[0064] It should be noted that this disclosure is not limited to the cover 2 covering the entire turbine housing 124 from above. In some embodiments, the cover 2 covers at least one of the first seam 125, the second seam 127, the third seam 129, and the opening 11 of the heat insulation layer 10 from above. In some embodiments, the base end 2a of the cover 2 is located at a position overlapping the turbine housing 124 in the axial direction D1. That is, the base end 2a of the cover 2 is located directly above the turbine housing 124 or radially outside the turbine housing 124 by a distance D2.

[0065] Although not illustrated, in some embodiments, the turbine housing 124 includes an inlet-side housing connected to the inlet pipe 160 and forming a turbine chamber that accommodates the turbine rotor 122, and an outlet-side housing connected to the outlet pipe 162 and demarcated relative to the turbine chamber on the downstream side of the exhaust flow path 131. Furthermore, the cover 2 covers from above the portion where the inlet-side housing and the outlet-side housing are interconnected.

[0066] It should be noted that, in one embodiment, the cover 2 extends from the turbine housing 124 side toward the muffler 116 side in such a way that it covers a portion of the muffler 116 from above, thereby enabling the turbocharger cover device 1 to introduce the gas Ax retained in the gas fuel retention space 3 into the muffler 116 side by the negative pressure of the compressor 114, but this disclosure is not limited to this method. Figure 8 This is a diagram that schematically illustrates the configuration of a turbocharger shroud device 1 according to some embodiments. Figure 8 In the illustrated configuration, the top end 2b of the cover 2 is positioned above the bearing housing 120 in the axial direction D1, overlapping with it. That is, the cover 2 does not extend from the base end 2a above the muffler 116. Furthermore, the turbocharger cover assembly 1 also includes an inlet pipe 30 configured to introduce gas Ax retained in the gaseous fuel retention space 3 into the muffler 116 side via the negative pressure of the compressor 114. The inlet pipe 30 has an internal inlet flow path for the gas Ax retained in the gaseous fuel retention space 3, connecting the gaseous fuel retention space 3 with the space above the muffler 116 (part of the external space 180). With this configuration, gas Ax retained in the gaseous fuel retention space 3 can be introduced into the muffler 116 via the inlet pipe 30.

[0067] <Engine System Operation Methods>

[0068] right Figure 1An example of how the engine system 100 is used will be described. One embodiment of the engine system 100's operation method includes a diesel operation execution step S1, which involves performing diesel operation when fuel combustion operation is stopped. As a specific example, after instructing the engine 150 to stop fuel combustion operation, the control device 200 instructs the engine 150 to perform diesel operation. That is, when fuel combustion operation stops, the engine system 100 automatically performs diesel operation, burning fuels such as oil, LNG (Liquefied Natural Gas).

[0069] In one embodiment, diesel operation is performed in step S1 until the concentration of gaseous fuel F (ammonia concentration) detected by concentration detection device 210 falls below a preset threshold. As a specific example, after instructing engine 150 to stop fuel combustion, control device 200 instructs engine 150 to perform diesel operation until the concentration of gaseous fuel F (ammonia concentration) in gaseous fuel retention space 3 falls below the threshold.

[0070] According to one embodiment of the engine system 100, the operation of the engine system 100 can be stopped after reducing the residual amount of gaseous fuel F in the engine 150 and the turbocharger 110. Even if gaseous fuel F leaks from the turbocharger 110, the leaked gaseous fuel F can be introduced into the engine 150 and burned by diesel operation.

[0071] According to one embodiment of the engine system 100, even if gaseous fuel F leaks from the turbocharger 110, diesel operation is performed until the concentration of gaseous fuel F (ammonia concentration) in the gaseous fuel retention space 3 becomes below a threshold, thereby suppressing the amount of gaseous fuel F that diffuses into the external space 180.

[0072] <Installation Method for the Overcharger Cover Device>

[0073] The method for installing the turbocharger cover device 1 will be described. One embodiment of the turbocharger cover device 1 includes an installation step S11 in which the cover 2 is mounted to the bearing housing 120 via a support member 40. The support member 40 may be pre-installed in the bearing housing 120 in a detachable manner, and may also be pre-installed on the cover 2.

[0074] According to one embodiment of the turbocharger cover device 1 installation method, the turbocharger cover device 1, which can suppress the diffusion of gaseous fuel F into the external space 180 when it leaks from the turbine 112, can be easily installed on the turbocharger 110. Moreover, according to this method, the turbocharger cover device 1 can be easily added to an existing engine system.

[0075] For example, you can learn the contents described in the above embodiments as follows.

[0076] [1] The turbocharger shroud device (1) disclosed herein is a turbocharger shroud device used in a turbocharger (110) that can be driven by exhaust gas (G) generated by the combustion of fuel (FL) which is lighter than air in the gaseous state, wherein,

[0077] The booster includes:

[0078] Turbine (112), including turbine housing (124) for the inflow of said exhaust gas;

[0079] The compressor (114) includes a compressor housing (142) for the intake of suction (A); and

[0080] A silencer (116), connected to the compressor housing, is used to reduce the noise generated when the intake air is drawn in from the surroundings.

[0081] The turbocharger cover device includes: a cover (2) that covers at least a portion of the turbine housing from above, and the cover (2) is used to define a gaseous fuel retention space (3) between the cover and the turbine housing, which allows gaseous fuel (F) in the event of leakage to be retained.

[0082] The booster shroud is configured to introduce gas (Ax) retained in the gaseous fuel retention space into the muffler side through the negative pressure of the compressor.

[0083] According to the configuration described above [1], even if gaseous fuel leaks from the turbocharger, it will remain in the gaseous fuel retention space, preventing the diffusion of gaseous fuel. Moreover, the gaseous fuel in the gaseous fuel retention space can be introduced into the muffler as intake air through the negative pressure of the compressor and burned. Therefore, diffusion can be suppressed when gaseous fuel leaks from the turbocharger.

[0084] [2] In some embodiments, in the configuration described in [1] above,

[0085] The cover extends from the turbine housing side toward the muffler side in a manner that covers at least a portion of the muffler from above.

[0086] According to the configuration described above [2], the cover extends to the muffler, thus making it easy to introduce the gas trapped in the gaseous fuel stagnation space into the muffler. In addition, the gas trapped in the gaseous fuel stagnation space can be introduced into the muffler without the need for additional components other than the cover.

[0087] [3] In some embodiments, in the configuration described in [2] above,

[0088] At least a portion of the top surface (8) of the shroud facing the gas fuel retention space has an inclined surface that slopes upwards as it moves from the turbine housing side toward the muffler side.

[0089] According to the configuration described above [3], the gaseous fuel in the gaseous fuel retention space can move toward the muffler.

[0090] [4] In some embodiments, in the configuration described in [2] or [3] above,

[0091] The cover covers more than 10% of the length of the compressor in the axial direction (D1) of the silencer from above.

[0092] According to the configuration described above [4], most of the gas remaining in the gaseous fuel storage space can be introduced into the silencer.

[0093] [5] In some embodiments, in the configuration described in [4] above,

[0094] The cover covers from above a portion of the compressor in the muffler that is more than 10% and less than 50% of its axial length in the direction of the compressor.

[0095] According to the configuration described above [5], the rise in intake temperature caused by the gas remaining in the gas fuel retention space can be suppressed, and most of the gas remaining in the gas fuel retention space can be introduced into the muffler.

[0096] [6] In some embodiments, in any one of the configurations described in [1] to [5] above,

[0097] The booster also includes:

[0098] A rotating shaft (118) connects the turbine and the compressor coaxially; and

[0099] The bearing housing (120) accommodates the bearing (144) that supports the rotating shaft for rotation.

[0100] The turbine housing is connected to an inlet pipe (160) for the exhaust gas to flow into the turbine housing, an outlet pipe (162) for the exhaust gas to flow out of the turbine housing, and the bearing housing.

[0101] When the portion connecting the turbine housing to the inlet pipe is designated as the first joint (125), the portion connecting the turbine housing to the outlet pipe is designated as the second joint (127), and the portion connecting the turbine housing to the bearing housing is designated as the third joint (129),

[0102] The cover covers at least one of the first seam, the second seam, and the third seam from above.

[0103] According to the configuration described above [6], at least one of the first joint, the second joint, and the third joint, which are more likely to leak gaseous fuel, is covered from above by a shroud. Therefore, the diffusion of gaseous fuel leaking from the turbocharger can be suppressed.

[0104] [7] In some embodiments, in the configuration described in [1] above,

[0105] The turbocharger cover device also includes an inlet pipe (30).

[0106] The inlet pipe (30) can introduce the gas trapped in the gas fuel stagnation space into the muffler side through the negative pressure of the compressor.

[0107] According to the configuration described above [7], the gas that is retained in the gas fuel retention space can be introduced into the silencer through the inlet pipe.

[0108] [8] The method of using the engine system disclosed herein is the method of using the engine system (100).

[0109] The engine system (100) includes:

[0110] A supercharger (110); a supercharger shroud assembly (1) as described in any one of [1] to [7] above; and an engine (150) that discharges the exhaust gas flowing into the turbine housing, wherein,

[0111] The method of operating the engine system includes the following steps (S1):

[0112] When the fuel combustion operation that causes the engine to burn the fuel stops, diesel operation that causes the engine to burn diesel fuel is performed.

[0113] According to the configuration described above [8], the engine system can be shut down after reducing the amount of gaseous fuel remaining in the engine and turbocharger.

[0114] [9] In some embodiments, in the configuration described in [8] above,

[0115] The engine system also includes a concentration detection device (210) for detecting the concentration of the gaseous fuel in the gaseous fuel retention space.

[0116] In the step of operating the diesel fuel, the diesel fuel is operated until the concentration of the gaseous fuel detected by the concentration detection device falls below a preset threshold.

[0117] According to the configuration described above [9], even if gaseous fuel leaks from the turbocharger, diesel operation is carried out until the concentration of gaseous fuel detected by the concentration detection device is below the threshold, thus suppressing the amount of gaseous fuel that diffuses.

[0118]

[10] The method for installing a turbocharger shroud device disclosed herein is a method for installing a turbocharger shroud device (1) used in a turbocharger (110) that can be driven by exhaust gas generated from the combustion of fuel that is lighter than air in the gaseous state, wherein,

[0119] The booster includes:

[0120] A turbine, including a turbine housing for the inflow of the exhaust gas;

[0121] A compressor, including the compressor housing for intake air inflow;

[0122] A silencer, connected to the compressor housing, is used to reduce the noise generated when the intake air is drawn in from the surroundings;

[0123] A rotating shaft connects the turbine and the compressor coaxially; and

[0124] A bearing housing that accommodates a bearing that supports the rotating shaft for free rotation.

[0125] The method for installing the shroud device for the booster includes the following steps (S11):

[0126] The cover is mounted to the bearing housing via a support member. The cover is a cover that covers at least a portion of the turbine housing from above, and the cover is used to define a gaseous fuel retention space between the cover and the turbine housing, which allows the gaseous fuel, as gaseous fuel, to be retained in the event of a leak.

[0127] According to the method described above

[10] , a turbocharger shroud device that can suppress diffusion when gaseous fuel leaks from the turbocharger can be easily installed in the turbocharger. The turbocharger shroud device disclosed herein is more compact than the exhaust system described in Patent Document 1, and is particularly advantageous in that it is easy to add to existing engine systems.

[0128] Explanation of reference numerals in the attached figures

[0129] 1: Overhead compressor cover device;

[0130] 2: Cover;

[0131] 2a: Base;

[0132] 2b: Top;

[0133] 3: Space for gaseous fuel retention;

[0134] 4: Base end fold-back section;

[0135] 5: The area enclosed by the cover;

[0136] 6: Top side fold-back section;

[0137] 8: Top surface;

[0138] 10: Insulation layer;

[0139] 11: Opening;

[0140] 30: Inlet tube;

[0141] 40: Supporting components;

[0142] 100: Engine system;

[0143] 110: Supercharger;

[0144] 112: Turbine;

[0145] 114: Compressor;

[0146] 116: Silencer;

[0147] 118: Rotation axis;

[0148] 120: Bearing housing;

[0149] 121: Inlet / Outlet;

[0150] 122: Turbine rotor;

[0151] 123: Outlet;

[0152] 124: Turbine housing;

[0153] 125: First seam section;

[0154] 127: Second seam section;

[0155] 129: Third seam;

[0156] 130: Flow into the side flange surface;

[0157] 131: Exhaust flow path;

[0158] 132: Flows out from the side flange surface;

[0159] 133: Vortex flow path;

[0160] 134: Vortex section;

[0161] 136: Turbine side connection surface;

[0162] 138: The wall of the vortex section;

[0163] 140: Impeller;

[0164] 142: Compressor housing;

[0165] 144: Bearing;

[0166] 150: Engine;

[0167] 151: Combustion chamber;

[0168] 152: Air pump;

[0169] 154: Fuel injection device;

[0170] 160: Inflow pipe;

[0171] 162: Outflow tube;

[0172] 164: Top surface of the inflow pipe;

[0173] 166: Top surface of the outlet pipe;

[0174] 180: External space;

[0175] 200: Control device;

[0176] 210: Concentration detection device;

[0177] A: Inhale;

[0178] Ax: gas;

[0179] D1: Axis direction;

[0180] D2: Radial;

[0181] D3: Zhou Xiang;

[0182] DF: Diesel fuel;

[0183] F: Gaseous fuel;

[0184] FL: Fuel;

[0185] G: Exhaust;

[0186] O1: The axis of rotation of the turbine;

[0187] O2: The rotating axis of the compressor;

[0188] S1: Diesel engine operation procedure;

[0189] S11: Installation steps;

[0190] g: Bottom plate surface.

Claims

1. A turbocharger shroud device, which is used in a turbocharger driven by exhaust gas generated from the combustion of fuel that is lighter than air in the gaseous state, wherein, The booster includes: A turbine, including a turbine housing for the inflow of the exhaust gas; The compressor includes a compressor housing for intake air flow; and A silencer, connected to the compressor housing, is used to reduce the noise generated when the intake air is drawn in from the surroundings. The turbocharger shroud assembly comprises: a shroud that covers at least a portion of the turbine housing from above, and the shroud being used to define a gaseous fuel retention space between itself and the turbine housing, allowing for the retention of the gaseous fuel, which is in a gaseous state, in the event of a leak. The booster shroud is configured to introduce gas trapped in the gaseous fuel stagnation space into the muffler side through the negative pressure of the compressor.

2. The turbocharger cover device according to claim 1, wherein, The cover extends from the turbine housing side toward the muffler side in a manner that covers at least a portion of the muffler from above.

3. The turbocharger cover device according to claim 2, wherein, At least a portion of the top surface of the shroud facing the gaseous fuel retention space has an inclined surface that slopes upwards as it moves from the turbine housing side toward the muffler side.

4. The turbocharger shroud device according to claim 2 or 3, wherein, The cover extends from above over a portion of the compressor within the muffler, encompassing more than 10% of its axial length.

5. The turbocharger shroud device according to claim 4, wherein, The cover covers from above a portion of the compressor in the muffler that is more than 10% and less than 50% of its axial length in the direction of the compressor.

6. The turbocharger shroud device according to any one of claims 1 to 3, wherein, The booster also includes: A rotating shaft connects the turbine and the compressor coaxially; and A bearing housing that accommodates the bearing that supports the rotating shaft for free rotation. The turbine housing is connected to an inlet pipe for the exhaust gas to flow into the turbine housing, an outlet pipe for the exhaust gas to flow out of the turbine housing, and the bearing housing. When the portion connecting the turbine housing to the inlet pipe is designated as the first joint, the portion connecting the turbine housing to the outlet pipe is designated as the second joint, and the portion connecting the turbine housing to the bearing housing is designated as the third joint,... The cover covers at least one of the first seam, the second seam, and the third seam from above.

7. The turbocharger cover device according to claim 1, wherein, The turbocharger cover device also includes an inlet pipe. The inlet pipe is configured to introduce gas trapped in the gaseous fuel stagnation space into the muffler side through the negative pressure of the compressor.

8. A method of using an engine system, the engine system comprising: a turbocharger; a turbocharger shroud as claimed in any one of claims 1 to 3; and an engine that discharges exhaust gas flowing into the turbine housing, wherein, The method of operating the engine system includes the following steps: When the fuel combustion operation that causes the engine to burn the fuel stops... The engine is operated by burning diesel fuel.

9. The method of using the engine system according to claim 8, wherein, The engine system also includes a concentration detection device for detecting the concentration of the gaseous fuel within the gaseous fuel retention space. In the step of operating the diesel fuel, the diesel fuel is operated until the concentration of the gaseous fuel detected by the concentration detection device falls below a preset threshold.

10. A method for installing a turbocharger shroud device, which is used in a turbocharger capable of being driven by exhaust gas generated from the combustion of a fuel that is lighter than air in the gaseous state, wherein... The booster includes: A turbine, including a turbine housing for the inflow of the exhaust gas; A compressor, including the compressor housing for intake air inflow; A silencer, connected to the compressor housing, is used to reduce the noise generated when the intake air is drawn in from the surroundings; A rotating shaft connects the turbine and the compressor coaxially; and A bearing housing that accommodates the bearing that supports the rotating shaft for free rotation. The method for installing the shroud device for the booster includes the following steps: The cover is mounted to the bearing housing via a support member, the cover covering at least a portion of the turbine housing from above, and the cover is used to define a gaseous fuel retention space between the cover and the turbine housing, which allows the gaseous fuel, as gaseous fuel, to be retained in the event of a leak.

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