Gas engine

Abstract

The application provides a gas machine, which comprises a crankcase, an oil-gas separator, an anti-surge valve, a supercharger and an anti-backflow device; the crankcase, the oil-gas separator, the anti-backflow device, the anti-surge valve and the supercharger are sequentially arranged in a fluid conveying direction and are communicated with each other through pipelines; the anti-backflow device comprises a Tesla valve, an air inlet joint and an air outlet joint; the air inlet joint is connected between the oil-gas separator and an air inlet end of the Tesla valve; and the air outlet joint is connected between an air outlet end of the Tesla valve and the anti-surge valve. The gas machine provided by the application can avoid gas backflow of the crankcase when the anti-surge valve is supplemented with air, can affect the pressure in the crankcase, can ensure that the pressure in the crankcase can always be kept lower than the atmospheric pressure, and can ensure that the emission of the gas machine meets the national sixth emission standard.

Description

Technical Field

[0001] This application relates to the field of engine technology, and more particularly to a gas engine. Background Technology

[0002] A gas engine, also known as a natural gas engine, is an engine that uses combustible gases such as natural gas as fuel. The GB17691-2018 China VI emission standard requires that during the engine emission test cycle (WHTC cycle), the crankcase pressure of the gas engine be maintained below atmospheric pressure to prevent fuel degradation or leakage, which could affect fuel combustion and thus emissions.

[0003] Following the crankcase of the gas engine are an oil-gas separator and a turbocharger. During variable operating conditions, the flow rate to the turbocharger changes. While the turbocharger's output pressure remains constant, when the flow rate entering the turbocharger decreases to a certain value (the range below this value is called the surge zone), the turbocharger will experience surge. To prevent surge, an anti-surge valve is typically installed between the oil-gas separator and the turbocharger. This anti-surge valve supplies gas to the turbocharger, preventing the flow rate to the turbocharger from dropping to the surge zone.

[0004] However, when the anti-surge valve replenishes air, the pressure at the crankcase outlet also increases, and the crankcase pressure cannot be maintained below atmospheric pressure, thus failing to meet emission requirements. Summary of the Invention

[0005] This application provides a gas engine to address the problem that existing gas engines cannot maintain crankcase pressure below atmospheric pressure, thus failing to meet emission requirements.

[0006] This application provides a gas engine, which includes a crankcase, an oil-gas separator, an anti-surge valve, a booster, and an anti-backflow device;

[0007] The crankcase, oil-gas separator, anti-backflow device, anti-surge valve and turbocharger are arranged in sequence in the fluid delivery direction and are interconnected by pipelines;

[0008] The backflow prevention device includes a Tesla valve, an inlet connector, and an outlet connector. The inlet connector is connected between the oil-gas separator and the inlet end of the Tesla valve; the outlet connector is connected between the outlet end of the Tesla valve and the anti-surge valve.

[0009] The gas engine provided in this application prevents surge in the turbocharger by installing an anti-surge valve between the turbocharger and the oil-gas separator. Furthermore, an anti-backflow device is installed after the crankcase to prevent gas backflow into the crankcase during gas replenishment from the anti-surge valve, thus ensuring that the crankcase pressure remains below atmospheric pressure and that the gas engine's emissions meet the China VI emission standards. The anti-backflow device includes a Tesla valve, an inlet connector, and an outlet connector. The Tesla valve is a passive unidirectional valve with a fixed geometry, allowing fluid to flow in one direction. It overcomes the shortcomings of traditional valves, which are prone to damage due to movable parts, and has a long service life. The inlet and outlet connectors connect the Tesla valve between the oil-gas separator and the anti-surge valve. Compared to placing the anti-backflow device before the oil-gas separator, this application places it after the separator, preventing excessive oil content in the fluid flowing through the Tesla valve and avoiding oil buildup that could clog the valve's channels, thereby extending the service life of the anti-backflow device.

[0010] In one implementation, the Tesla valve includes a base plate and a cover plate;

[0011] A groove is provided on one side surface of the substrate, extending from one end of the substrate along its length to the other end; a cover plate is placed on the side surface of the substrate with the groove, and the cover plate and the groove together form a fluid channel, with the two ends of the fluid channel being the air inlet and the air outlet, respectively.

[0012] In one implementation, both the air inlet and the air outlet have stepped surfaces. The air inlet connector is inserted into the air inlet and abuts against the stepped surface, and the air outlet connector is inserted into the air outlet and abuts against the stepped surface.

[0013] In one implementation, both the outer wall surface of the intake connector away from the Tesla valve and the outer wall surface of the exhaust connector away from the Tesla valve are provided with annular protrusions.

[0014] In one implementation, the backflow prevention device also includes an insulation cover that is positioned over the Tesla valve.

[0015] In one implementation, the heat insulation cover includes an outer shell and at least one heating plate;

[0016] The housing is wrapped around the outside of the Tesla valve, and the heating plate is set inside the housing and attached to the outer surface of the Tesla valve.

[0017] In one implementation, at least one heating plate includes a first heating plate and a second heating plate, which are respectively attached to the outer surfaces of opposite sides of the Tesla valve.

[0018] In one implementation, a first heating plate is attached to the surface of the cover plate opposite to the substrate, and a second heating plate is attached to the surface of the substrate opposite to the cover plate.

[0019] In one implementation, the heat insulation cover also includes a heat insulation layer disposed between the heating plate and the outer shell.

[0020] In one implementation, the heating plate is used to communicate with the electronic control unit.

[0021] The structure of this application, as well as its other inventive objectives and beneficial effects, will become more apparent from the description of the preferred embodiments taken in conjunction with the accompanying drawings. Attached Figure Description

[0022] The above and other objects, features, and advantages of embodiments of this application will become more readily understood through the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application will be described by way of example and non-limitation, wherein:

[0023] Figure 1 This is a schematic diagram of a portion of the structure of a gas engine in related technologies;

[0024] Figure 2 This is a schematic diagram of a portion of the structure of a gas engine provided in an embodiment of this application;

[0025] Figure 3 A schematic diagram of the anti-backflow device provided in the embodiments of this application for forward flow;

[0026] Figure 4 A schematic diagram illustrating the reverse flow of the anti-backflow device provided in this embodiment of the application;

[0027] Figure 5 for Figure 3 A schematic diagram of section aa;

[0028] Figure 6 for Figure 3 A magnified view of part A in the diagram.

[0029] Figure label:

[0030] 100 - Anti-backflow device;

[0031] 110 - Tesla valve; 120a - Inlet connector; 120b - Outlet connector; 130 - Insulation cover;

[0032] 111-Substrate; 112-Cover plate; 113-Fluid channel; 114-Step surface; 131-Heating plate; 1311-First heating plate; 1312-Second heating plate; 132-Insulation layer; 133-Outer shell;

[0033] 200-crankcase;

[0034] 300-Oil-Gas Separator;

[0035] 400-anti-surge valve;

[0036] 500-Booster. Detailed Implementation

[0037] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0038] A gas engine, also known as a natural gas engine, is an engine that uses combustible gases such as natural gas as fuel. Since its invention in the early 1990s, gas engine technology has matured over the past eighty years. Currently, most gas engines are modified from existing diesel or gasoline engine models, and typically include a cylinder block, crankcase, oil-gas separator, and turbocharger.

[0039] The lower part of the cylinder block where the crankshaft is mounted is called the crankcase. The crankcase is divided into the upper crankcase and the lower crankcase. The upper crankcase is cast as one piece with the cylinder block, while the lower crankcase is used to store lubricating oil and seals the upper crankcase; therefore, the lower crankcase is also called the oil pan.

[0040] The latest GB17691-2018 China VI emission standard requires that during the engine emission test cycle (WHTC cycle), the crankcase pressure of the gas engine must be kept below atmospheric pressure. Excessive crankcase pressure will accelerate the wear and corrosion of its components. Maintaining the crankcase pressure at a stable low value can prevent the engine oil from deteriorating, oil leakage at various seals, and affect fuel combustion, thereby affecting emissions.

[0041] Figure 1 This is a schematic diagram of a portion of the structure of a gas engine in related technologies. For example... Figure 1 As shown, the crankcase 01 of the gas engine is connected in sequence to an oil-gas separator 02 and a turbocharger 04. During operation under varying conditions, the flow rate to the turbocharger 04 changes. The output pressure of the turbocharger 04 is constant. When the flow rate input to the turbocharger 04 decreases to a certain value (the range below this value is called the surge zone), the turbocharger 04 will experience a surge phenomenon.

[0042] Surge is an abnormal vibration that occurs in a booster when the flow rate decreases to a certain level. Surge can generate noise, accelerate the wear of internal machine parts, and pose safety hazards.

[0043] To prevent surge, an anti-surge valve 03 is usually installed between the oil-gas separator 02 and the booster 04. The anti-surge valve 03 can supply air to the booster 04 to prevent the flow rate to the booster 04 from dropping to the surge zone.

[0044] However, when the anti-surge valve 03 replenishes air, the pressure at the outlet of the oil-gas separator 02 will also increase. The oil-gas separator 02 is prone to backflow, which affects the crankcase 01 connected to it, causing the pressure at the outlet of the crankcase 01 to increase. This makes it impossible for the pressure of the crankcase 01 to be kept below atmospheric pressure, thus failing to meet the emission requirements.

[0045] In view of this, this application provides a gas generator, which includes a crankcase, an oil-gas separator, an anti-backflow device, an anti-surge valve, and a turbocharger arranged and connected in sequence. The anti-backflow device includes a Tesla valve, an inlet connector, and an outlet connector. This application connects the Tesla valve between the oil-gas separator and the surge valve through the inlet connector and the outlet connector to prevent gas backflow from occurring in the crankcase when the anti-surge valve is replenished with gas, which would affect the pressure inside the crankcase. This ensures that the pressure in the crankcase can always be kept below atmospheric pressure, and that the gas generator's emissions meet the China VI emission standards.

[0046] The gas generator provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0047] Figure 2 This is a schematic diagram of a portion of the structure of a gas engine provided in an embodiment of this application. (See attached diagram.) Figure 2 As shown in the figure, this application provides a gas generator, which includes a crankcase 200, an oil-gas separator 300, an anti-surge valve 400, a booster 500, and an anti-backflow device 100. The crankcase 200, the oil-gas separator 300, the anti-backflow device 100, the anti-surge valve 400, and the booster 500 are arranged sequentially in the fluid transport direction (i.e., the direction of the dotted arrow in the figure) and are interconnected by pipes.

[0048] During normal operation of the gas engine, some unburned combustible mixture and combustion exhaust gases may enter the crankcase 200 through various pathways. This leakage increases the temperature within the crankcase 200, increasing the evaporation of engine oil and forming an oil-gas mixture. The oil-gas mixture discharged from the crankcase 200 flows to the oil-gas separator 300, which efficiently separates the engine oil from the mixture. The purified gas then flows to the turbocharger 500, where its pressure increases before continuing to flow to other components of the gas engine.

[0049] This application prevents surge in the turbocharger 500 by installing an anti-surge valve 400 between the turbocharger 500 and the oil-gas separator 300. It also prevents backflow in the crankcase 200 by installing an anti-backflow device 100 after the crankcase 200 to prevent gas backflow in the crankcase 200 when the anti-surge valve 400 is replenished with gas, thus ensuring that the pressure inside the crankcase 200 is always kept below atmospheric pressure and that the gas engine's emissions meet the China VI emission standards.

[0050] The anti-backflow device 100 provided in this application includes a Tesla valve 110, an air inlet connector 120a, and an air outlet connector 120b. The air inlet connector 120a is connected between the oil-gas separator 300 and the air inlet end of the Tesla valve 110, and the air outlet connector 120b is connected between the air outlet end of the Tesla valve 110 and the anti-surge valve 400.

[0051] Tesla valve 110 is a passive one-way valve with a fixed geometry that allows fluid to flow in one direction. Tesla valve 110 overcomes the shortcomings of traditional valves that are prone to damage due to the need for moving parts. Furthermore, Tesla valve 110 has a very simple internal structure and does not require regular maintenance. Therefore, while ensuring that the gas engine meets emission standards, Tesla valve 110 can also extend the service life of anti-backflow device 100.

[0052] The air inlet connector 120a and the air outlet connector 120b can connect the Tesla valve 110 between the oil-gas separator 300 and the anti-surge valve 400. Compared with placing the anti-backflow device 100 before the oil-gas separator 300, this application places the anti-backflow device 100 after the oil-gas separator 300, which can avoid the oil content of the fluid flowing in the Tesla valve 110 being too high, so as to avoid the formation of oil sludge blocking the channel in the Tesla valve 110, thereby greatly reducing the maintenance frequency and extending the service life of the anti-backflow device 100.

[0053] Figure 3 This is a schematic diagram illustrating the forward flow of the anti-backflow device provided in an embodiment of this application. Figure 3 As shown, the Tesla valve 110 adopts a special circuit design. When the fluid passes through the Tesla valve 110 in the forward direction, the fluid will split into two paths at each circuit port. Then the two paths of fluid will converge at the next junction. When converging, the angle between the two paths of fluid flow is small, resulting in less energy loss and less resistance, so the fluid can converge smoothly.

[0054] Figure 4 This is a schematic diagram illustrating the reverse flow of the anti-backflow device provided in an embodiment of this application. (See attached diagram.) Figure 4As shown, if the fluid flows into the Tesla valve 110 in the opposite direction, the fluid will also split into two paths at the first junction and converge again at the second junction. The difference is that this time, the two fluids flow in opposite directions and collide, causing great energy loss and forming great resistance. Therefore, the Tesla valve 110 can only pass through in the forward direction and it is difficult to flow in the reverse direction.

[0055] Figure 5 for Figure 3 A schematic diagram of section aa. (Combined with...) Figure 3 and Figure 5 As shown, the Tesla valve 110 may include a substrate 111 and a cover plate 112. A groove is provided on one side surface of the substrate 111, which extends from one end of the substrate 111 along its length to the other end. The cover plate 112 covers the side surface of the substrate 111 with the groove. The cover plate 112 and the groove together form a fluid channel 113, and the two ends of the fluid channel 113 are the air inlet and air outlet of the Tesla valve 110, respectively.

[0056] It should be noted that the "length direction" mentioned in this application is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the groove referred to must extend along the longer side length of the substrate 111, and therefore should not be construed as a limitation of this application.

[0057] The fluid channel 113 inside the Tesla valve 110 has a relatively complex shape. By designing it as a split structure, the cover plate 112 and the groove on the base plate 111 together form the fluid channel 113, which simplifies the manufacturing process and reduces the manufacturing cost.

[0058] For example, the base plate 111 and cover plate 112 of the Tesla valve 110 can be made of materials such as metal or plastic, and the base plate 111 and cover plate 112 can be fixedly connected together by fasteners such as bolts. To ensure the sealing performance of the Tesla valve 110, a sealing gasket can be provided between the base plate 111 and cover plate 112 to prevent gas leakage; or, when the base plate 111 and cover plate 112 of the Tesla valve 110 are made of metal, the base plate 111 and cover plate 112 can also be welded together to improve the sealing performance of the Tesla valve 110 and prevent gas leakage.

[0059] Furthermore, since the main structure of the gas generator is made of metal, which has high thermal conductivity, when the outside temperature is too low, for example, in northern my country where the outdoor temperature in winter may reach -10℃ or -20℃, condensation will first appear inside the gas generator, and then freeze, causing blockage of the fluid passage 113 and affecting the normal operation of the gas generator. To prevent blockage of the fluid passage 113, the anti-backflow device 100 of this application may also include a heat insulation cover 130, which is installed over the Tesla valve 110. The heat insulation cover 130 is used to generate and retain heat to prevent blockage of the fluid passage 113.

[0060] like Figure 5 As shown, the insulation cover 130 may include a housing 133 and a heating plate 131. The housing 133 encloses the outside of the Tesla valve 110, and the heating plate 131 is disposed inside the housing 133. The housing 133 protects the heating plate 131 and the Tesla valve 110 from damage caused by impacts. In practical applications, the housing 133 can be made of plastic. Plastic has poor thermal conductivity, thus reducing costs while also providing insulation to slow down the rate of heat transfer to the outside. The heating plate 131 can be attached to the outer surface of the Tesla valve 110. The heating plate 131 generates heat and transfers it to the attached Tesla valve 110, preventing the gas inside the Tesla valve 110 from freezing.

[0061] For example, a heating plate 131 can be provided inside the housing 133. The heating plate 131 can be attached to any side surface of the Tesla valve 110. Specifically, the heating plate 131 can be attached to the side surface of the cover plate 112 of the Tesla valve 110 that is away from the substrate 111. Alternatively, the heating plate 131 can also be attached to the side surface of the substrate 111 that is away from the cover plate 112. The amount of heating plate 131 used can be controlled to save consumables and reduce costs.

[0062] Or, such as Figure 5 As shown, two heating plates 133 can also be provided inside the outer casing 133. The two heating plates 133 are the first heating plate 1311 and the second heating plate 1312, respectively. The first heating plate 1311 and the second heating plate 1312 can be respectively attached to the outer surfaces of opposite sides of the Tesla valve 110, so as to ensure that the temperature distribution around the Tesla valve 110 is relatively uniform while controlling the amount of heating plates 131 used, and to prevent the local temperature of the Tesla valve 110 from being too low.

[0063] Specifically, the first heating plate 1311 can be attached to the surface of the cover plate 112 opposite to the substrate 111, and the second heating plate 1312 can be attached to the surface of the substrate 111 opposite to the cover plate 112. Figure 3 and Figure 5 As shown, the surface area of ​​the side of the cover plate 112 facing away from the substrate 111 and the surface of the substrate 111 facing away from the cover plate 112 are large, and the fluid channel 113 in the Tesla valve 110 is close to these two surfaces. Placing the first heating plate 1311 and the second heating plate 1312 on these two surfaces can achieve a good heating effect.

[0064] In some examples, the heating plate 131 can be a PTC (Positive Temperature Coefficient) electric heating plate, which is an electric heater composed of a PTC ceramic heating element and an aluminum tube. PTC electric heating plates have the advantages of low thermal resistance and high heat exchange efficiency. Furthermore, PTC electric heating plates have superior safety performance; they will not produce the surface "red-hot" phenomenon seen in heating tube heaters under any application conditions, thus avoiding safety hazards such as burns and fires. In other examples, the heating plate 131 can also be other heat-generating products such as heating wires, as long as they can achieve basic heating functions.

[0065] In practical applications, taking the gas generator installed in a car as an example, the heating plate 131 can communicate with the car's Electronic Control Unit (ECU). The ECU can automatically control the heating plate 131 to start and stop. Specifically, a temperature control sensor (not shown in the figure) can be connected between the heating plate 131 and the ECU. When the temperature sensed by the temperature control sensor is less than or equal to a first preset value, the ECU controls the heating plate 131 to start working. When the temperature sensed by the temperature control sensor is greater than or equal to a second preset value, the ECU controls the heating plate 131 to stop working to save power and avoid energy waste, while also preventing the outermost plastic shell 133 from melting due to excessive temperature.

[0066] It should be noted that, since the heating layer requires a certain amount of time to heat up, in order to prevent the temperature of the fluid channel 113 inside the Tesla valve 110 from dropping below 0°C, the first preset value should be at least greater than 0°C. Furthermore, in order to prevent the generation of excessive condensate, the first preset value can be set to a higher temperature.

[0067] For example, the first preset value and the second preset value can be 10℃ and 20℃, respectively. When the temperature sensed by the temperature control sensor is less than or equal to 10℃, the electronic control unit controls the heating plate 131 to start working, and the temperature of the Tesla valve 110 gradually rises to avoid blockage of its internal fluid channel 113; when the temperature sensed by the temperature control sensor is greater than or equal to 20℃, the electronic control unit controls the heating plate 131 to stop working to avoid energy waste.

[0068] Alternatively, the first and second preset values ​​can be set to lower temperatures, such as 5°C or 8°C for the first preset value and 15°C or 18°C ​​for the second preset value, to further reduce energy consumption. Alternatively, the first and second preset values ​​can be set to higher temperatures, such as 15°C or 18°C ​​for the first preset value and 25°C or 28°C for the second preset value, to further reduce condensation.

[0069] Continue reading Figure 5 The heat insulation cover 130 provided in this embodiment may also include a heat insulation layer 132. The heat insulation layer 132 may be disposed between the heating plate 131 and the outer shell 133 to further slow down the rate at which heat is transferred to the outside and achieve a good heat insulation effect.

[0070] For example, the insulation layer 132 can be a layer of thermal insulation cotton. Thermal insulation cotton is a new type of non-toxic, harmless, and pollution-free thermal insulation material made from high-purity clay clinker, alumina powder, silica powder, chromium sand, and other raw materials. Thermal insulation cotton has low heat capacity and low thermal conductivity, providing excellent thermal insulation; it is easy to cut and install, facilitating construction and saving time; and it has good fire resistance, preventing spontaneous combustion at excessively high temperatures. Alternatively, the insulation layer 132 can also be made of other thermal insulation materials such as fiberglass wool.

[0071] Figure 6 for Figure 3 A magnified view of part A in the diagram. (Combined with...) Figure 3 and Figure 6 As shown, both the inlet and outlet ends can have stepped surfaces 114. The inlet connector 120a is inserted into the inlet end and abuts against the stepped surface 114, while the outlet connector 120b is inserted into the outlet end and abuts against the stepped surface 114. The width of the stepped surface 114 can be approximately equal to the wall thickness of the inlet connector 120a and the outlet connector 120b to prevent them from protruding from the surface of the fluid channel 113, thereby reducing resistance within the fluid channel 113 and ensuring smooth forward flow of gas. Furthermore, the stepped surface 114 can also serve as a positioning mark to ensure that the insertion lengths of the inlet connector 120a and the outlet connector 120b are appropriate, improving the reliability of the connection between them.

[0072] Specifically, the air inlet connector 120a and the air inlet end, as well as the air outlet connector 120b and the air outlet end, can be press-fitted to ensure the sealing of the connection and prevent air leakage; or, a sealing ring can be provided between the air inlet connector 120a and the air inlet end, as well as between the air outlet connector 120b and the air outlet end, to prevent air leakage.

[0073] For example, the outer wall surface of the end of the air inlet connector 120a away from the Tesla valve 110 and the outer wall surface of the end of the air outlet connector 120b away from the Tesla valve 110 can both be provided with annular protrusions (not shown in the figure). The pipes connected to the air outlet end of the oil-gas separator 300 and the air inlet end of the anti-surge valve 400 are both rubber hoses. The air inlet connector 120a and the air outlet connector 120b can be inserted into the rubber hoses, and the annular protrusions form an interference fit with the rubber hoses to prevent air leakage. To further ensure the stability of the connection, a clamp can also be fitted over the rubber hose to increase the friction between the air inlet connector 120a and the air outlet connector 120b and the rubber hose, preventing the air inlet connector 120a and the air outlet connector 120b from coming out of the rubber hose.

[0074] It is understood that the structures illustrated in the embodiments of this application do not constitute a specific limitation on the gas generator. In other embodiments of this application, the gas generator may include more components than illustrated, or combine some components, or split some components, or have different component arrangements. For example, the gas generator may also include devices such as cylinders.

[0075] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0076] In the description of this specification, references to terms such as "embodiment," "example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A gas generator, characterized in that, Includes crankcase, oil-gas separator, anti-surge valve, turbocharger, and anti-backflow device; The crankcase, the oil-gas separator, the anti-backflow device, the anti-surge valve, and the turbocharger are arranged sequentially in the fluid transport direction and are interconnected by pipelines. The anti-backflow device includes a Tesla valve, an inlet connector, and an outlet connector. The inlet connector is connected between the oil-gas separator and the inlet end of the Tesla valve; the outlet connector is connected between the outlet end of the Tesla valve and the anti-surge valve. The anti-surge valve is used to supply air to the booster to prevent the booster from surging. The anti-backflow device is used to prevent gas backflow in the crankcase when the anti-surge valve supplies air to the turbocharger, so that the pressure in the crankcase is always lower than atmospheric pressure; The Tesla valve includes a base plate and a cover plate; A groove is provided on one side surface of the substrate, and the groove extends from one end of the substrate to the other end along the length direction of the substrate; a cover plate is provided on the side surface of the substrate on which the groove is provided, and the cover plate and the groove together form a fluid channel, and the two ends of the fluid channel are the air inlet end and the air outlet end, respectively.

2. The gas generator according to claim 1, characterized in that, Both the air inlet and the air outlet have stepped surfaces. The air inlet connector is inserted into the air inlet and abuts against the stepped surface, and the air outlet connector is inserted into the air outlet and abuts against the stepped surface.

3. The gas generator according to claim 1 or 2, characterized in that, Both the outer wall surface of the air inlet connector away from the Tesla valve and the outer wall surface of the air outlet connector away from the Tesla valve are provided with annular protrusions.

4. The gas generator according to claim 1 or 2, characterized in that, The backflow prevention device also includes a heat insulation cover, which is installed over the Tesla valve.

5. The gas generator according to claim 4, characterized in that, The heat insulation cover includes an outer shell and at least one heating plate; The housing encloses the outside of the Tesla valve, and the heating plate is disposed inside the housing and is attached to the outer surface of the Tesla valve.

6. The gas generator according to claim 5, characterized in that, At least one heating plate includes a first heating plate and a second heating plate, which are respectively attached to the outer surfaces of opposite sides of the Tesla valve.

7. The gas generator according to claim 6, characterized in that, The first heating plate is attached to the surface of the cover plate opposite to the substrate, and the second heating plate is attached to the surface of the substrate opposite to the cover plate.

8. The gas generator according to claim 5, characterized in that, The heat insulation cover also includes a heat insulation layer, which is disposed between the heating plate and the outer shell.

9. The gas generator according to claim 5, characterized in that, The heating plate is used for communication connection with the electronic control unit.

Images