Fuel gas inlet structure, throttle valve and multi-fuel engine

Abstract

The utility model discloses a fuel gas inlet structure, a throttle valve and a multi-fuel engine, the fuel gas inlet structure is arranged on the throttle valve, the throttle valve comprises a throttle valve main body, the throttle valve main body is provided with a through air inlet channel, and the fuel gas inlet structure comprises a fuel gas inlet channel arranged in the throttle valve main body; a gas inlet end opening of the gas inlet channel is used for being connected with a gas conveying pipeline, a gas outlet end opening of the gas inlet channel communicates with the air inlet channel, a gas outlet guide pipe is arranged at the gas outlet end opening of the gas inlet channel, and the gas outlet guide pipe is obliquely arranged in the gas outlet direction of the air inlet channel. At least one part of the air outlet guide pipe extends into the air inlet channel, the end face of the air outlet end of the air outlet guide pipe is a smooth face, and the side, facing the air inflow side in the air inlet channel, of the end face of the air outlet end of the air outlet guide pipe is higher than the side, back to the air inflow side in the air inlet channel, of the end face of the air outlet end of the air outlet guide pipe. The gas outlet speed and the gas outlet stability of fuel gas can be effectively improved.

Description

Technical Field

[0001] The present application belongs to the field of engine technology, and in particular relates to a gas intake structure, a throttle valve and a multi-fuel engine. Background Art

[0002] At present, in order to expand the applicable scenarios of internal combustion engines, some multi-fuel engines have emerged that can use multiple fuels such as fuel oil (mainly gasoline, alcohol, etc.) and gas (mainly natural gas, LPG liquefied petroleum gas, biogas, etc.). Users can switch the corresponding fuel according to their needs by operating the fuel selection switch.

[0003] The throttle of a multi-fuel engine that can use liquid fuel and gas fuel is usually equipped with a fuel delivery channel, a gas intake channel and an air intake channel. The fuel or gas is mixed with the air entering from the intake end of the air intake channel at the throat of the outlet end of the air intake channel inside the throttle and then enters the engine cylinder.

[0004] However, the outlet port of the existing gas intake passage is flush with the bottom of the inner wall of the air intake passage, and at the outlet end of the air intake passage, the gas intake direction is perpendicular or approximately perpendicular to the air intake direction. Therefore, in the process of the gas entering the outlet end of the air intake passage through the outlet port of the gas intake passage, the entry of air will hinder the gas outlet, thereby affecting the gas outlet speed and gas outlet stability. Although the gas intake speed can be increased by increasing the gas delivery pressure, the gas delivery pressure is subject to certain limitations under actual working conditions. Therefore, when the gas delivery pressure has been adjusted to the maximum, if the power required by the engine is large at this time, the influence of the entry of air on the gas outlet speed makes the gas intake speed unable to meet the power requirement, which may cause the engine to fail to reach the required power, affecting the engine's performance.

[0005] Therefore, how to effectively improve the gas outlet speed and gas outlet stability while maintaining a certain gas delivery pressure is a problem that needs to be solved urgently in this field. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the present application is to provide a gas intake structure, a throttle valve and a multi-fuel engine, which can effectively improve the gas outlet speed and gas outlet stability while maintaining a certain gas delivery pressure.

[0007] In order to achieve the above objectives, this application provides the following solutions:

[0008] According to a first aspect of the present application, the present application provides a gas intake structure, which is arranged on a throttle valve, wherein the throttle valve comprises a throttle valve body, wherein the throttle valve body is provided with an air intake passage passing therethrough, and the gas intake structure comprises:

[0009] A gas intake passage is provided in the throttle body, the gas intake passage has an intake port and an outlet port, the intake port of the gas intake passage is used to connect to a gas delivery pipeline, and the outlet port of the gas intake passage is communicated with the air intake passage, wherein:

[0010] An air outlet guide pipe is provided at the air outlet port of the gas intake passage, and the air outlet guide pipe is inclined toward the air outlet direction of the air intake passage, and at least a portion of the air outlet guide pipe extends into the air intake passage, and an end face of one end of the air outlet guide pipe for air outlet is a smooth face, and a side of the end face of one end of the air outlet guide pipe for air outlet facing the air inflow into the air intake passage is higher than a side facing away from the air inflow into the air intake passage.

[0011] Preferably, the air outlet guide pipe is a tube body, one end of the tube body is inserted at the air outlet port of the gas intake passage, and the other end of the tube body extends into the air intake passage.

[0012] Preferably, the gas outlet guide pipe is detachably connected to the gas inlet passage.

[0013] Preferably, the air outlet guide pipe is a copper pipe.

[0014] Preferably, the air outlet guide pipe is integrally formed with the throttle body.

[0015] Preferably, an angle α is formed between an end surface of one end of the air outlet guide pipe and the air flow direction in the air intake passage, wherein 30°<α<60°.

[0016] Preferably, the height difference between the highest point of the end surface of the outlet end of the air outlet guide pipe facing the air inflow into the air intake channel and the lowest point of the end surface facing away from the air inflow into the air intake channel is 2 to 8 mm.

[0017] Preferably, an angle β is formed between the flow direction of the gas in the gas outlet guide pipe and the gas outlet direction of the air intake passage, wherein 15°<β<75°.

[0018] According to a second aspect of the present application, the present application provides a throttle valve, which is applied to a multi-fuel engine. The throttle valve includes the fuel gas intake structure described in any one of the first aspects above.

[0019] According to a third aspect of the present application, the present application provides a multi-fuel engine, wherein the multi-fuel engine comprises the throttle valve described in the second aspect above.

[0020] Due to the adoption of the above technical solution, this application has the following beneficial effects:

[0021] The invention relates to a method for making the air intake duct of the present invention be closer to the air intake duct and closer to the air outlet duct, so as to reduce the angle between the air flow direction of the air intake duct and the gas flow direction in the gas intake duct, so that the gas in the gas intake duct has a tendency to be consistent with the air flow direction when flowing into the throat of the air outlet end of the air intake duct, thereby effectively reducing the obstruction of the air entering the air intake duct to the gas flow at the gas outlet port of the gas intake duct, so that the gas can flow from the gas outlet port of the gas intake duct to the throat of the air outlet end of the air intake duct more smoothly and stably.

[0022] In addition, by extending at least a portion of the air outlet guide pipe into the air intake passage, the end face of one end of the air outlet guide pipe is a smooth surface, and the side of the end face of the one end of the air outlet guide pipe facing the air inflow into the air intake passage is higher than the side facing away from the air inflow into the air intake passage. In this way, the side of the end face of one end of the air outlet guide pipe facing the air inflow into the air intake passage can form a certain blocking effect on the flowing air in the air intake passage, thereby changing the air flow direction and flow speed near the air outlet port of the air outlet guide pipe, and forming a local negative pressure at the air outlet port of the air outlet guide pipe, thereby having a certain suction effect on the gas in the gas intake passage, thereby effectively accelerating the flow speed and flow speed stability of the gas at the air outlet port of the gas intake passage when entering the air intake passage.

[0023] In summary, the present application improves the gas intake structure on the throttle valve, thereby being able to effectively increase the gas outlet speed and gas outlet stability while maintaining a certain gas delivery pressure.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the present application or the technical solution in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation or the prior art description. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a schematic diagram of the three-dimensional structure of a throttle valve in one embodiment of the present application;

[0027] Figure 2 yes Figure 1 Bottom view of

[0028] Figure 3 yes Figure 2 AA section view;

[0029] Figure 4 yes Figure 1 Rear view of

[0030] Figure 5 yes Figure 4 BB cross-sectional view. DETAILED DESCRIPTION

[0031] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0032] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined.

[0033] In this application, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] like Figure 1-5 As shown, an embodiment of the present application provides a gas intake structure, which is arranged on a throttle valve, the throttle valve includes a throttle valve body 1, the throttle valve body 1 is provided with an air intake passage 2 passing through, and the gas intake structure includes:

[0036] A gas inlet passage 3 is provided in the throttle body 1, and the gas inlet passage 3 has an inlet port and an outlet port. The inlet port of the gas inlet passage 3 is used to connect the gas delivery pipeline, and the outlet port of the gas inlet passage 3 is communicated with the air inlet passage 2, wherein:

[0037] An air outlet guide pipe 4 is provided at the air outlet port of the gas intake passage 3. The air outlet guide pipe 4 is inclined toward the air outlet direction of the air intake passage 2, and at least a portion of the air outlet guide pipe 4 extends into the air intake passage 2. The end face of one end of the air outlet guide pipe 4 is a smooth face, and the side of the end face of one end of the air outlet guide pipe 4 facing the air inflow into the air intake passage 2 is higher than the side facing away from the air inflow into the air intake passage 2.

[0038] The working principle of the gas intake structure in this embodiment is as follows:

[0039] The present application is based on the prior art, by arranging an air outlet guide pipe 4 at the air outlet port of the gas inlet channel 3, and arranging the air outlet guide pipe 4 in an inclined manner toward the air outlet direction of the air inlet channel 2, so as to reduce the angle between the air flow direction of the air inlet channel 2 and the gas flow direction in the gas inlet channel 3, so that the gas in the gas inlet channel 3 has a tendency to be consistent with the air flow direction when flowing into the throat portion of the air outlet end of the air inlet channel 2, thereby effectively reducing the obstruction of the air entering the air inlet channel 2 to the gas flow at the air outlet port of the gas inlet channel 3, so that the gas can flow from the air outlet port of the gas inlet channel 3 to the throat portion of the air outlet end of the air inlet channel 2 more smoothly and stably;

[0040] In addition, by extending at least a portion of the air outlet guide pipe 4 into the air intake passage 2, the end face of one end of the air outlet guide pipe 4 is a smooth surface, and the side of the end face of the air outlet end of the air outlet guide pipe 4 facing the air inflow into the air intake passage 2 is higher than the side facing away from the air inflow into the air intake passage 2. In this way, the side of the end face of the air outlet end of the air outlet guide pipe 4 facing the air inflow into the air intake passage 2 can form a certain blocking effect on the flowing air in the air intake passage 2, thereby changing the air flow direction and flow speed near the air outlet port of the air outlet guide pipe 4, and forming a local negative pressure at the air outlet port of the air outlet guide pipe 4, thereby having a certain suction effect on the gas in the gas intake passage 3, thereby effectively accelerating the flow speed and flow speed stability of the gas at the air outlet port of the gas intake passage 3 when entering the air intake passage 2.

[0041] In summary, it can be seen that this embodiment improves the gas intake structure on the throttle valve, thereby effectively improving the gas outlet speed and gas outlet stability while maintaining a certain gas delivery pressure.

[0042] like Figure 3 As shown, in one embodiment, the air outlet guide pipe 4 is a pipe body, one end of which is inserted at the air outlet port of the gas intake passage 3, and the other end of which extends into the air intake passage 2. By setting the air outlet guide pipe 4 as a pipe body, the installation of the air outlet guide pipe 4 is facilitated, and the modification of the existing throttle valve is also facilitated.

[0043] On the basis of the previous embodiment, in one embodiment, the gas outlet guide pipe 4 is detachably connected to the gas inlet passage 3. Such arrangement facilitates the disassembly, assembly and replacement of the gas outlet guide pipe 4.

[0044] Specifically, in one embodiment, the gas outlet guide pipe 4 is a copper pipe. Since there are some corrosive impurities in the gas, and the copper pipe has good corrosion resistance, the gas outlet guide pipe 4 is set as a copper pipe, which effectively improves the corrosion resistance of the gas outlet guide pipe 4, thereby extending the service life of the gas outlet guide pipe 4.

[0045] In one embodiment, the air outlet guide pipe 4 is integrally formed with the throttle body 1. This arrangement can reduce the number of parts of the throttle and ensure the reliability and sealing of the connection between the air outlet guide pipe 4 and the gas inlet passage 3.

[0046] In one embodiment, an angle α is formed between the end face of one end of the outlet guide pipe 4 and the air flow direction in the air intake passage 2, wherein 30°<α<60°. The simulation experiment proves that when the angle α formed between the end face of one end of the outlet guide pipe 4 and the air flow direction in the air intake passage 2 is between 30° and 60°, the effect of improving the speed and stability of the gas outlet at the outlet port of one end of the outlet guide pipe 4 extending into the air intake passage 2 is better. Specifically, in this embodiment, the angle α formed between the end face of one end of the outlet guide pipe 4 and the air flow direction in the air intake passage 2 is 35°.

[0047] In one embodiment, the height difference between the highest point of the end surface of the outlet end of the air outlet guide pipe 4 facing the air inflow into the air intake channel 2 and the lowest point of the side facing away from the air inflow into the air intake channel 2 is 2 to 8 mm. Through simulation experiments, it is proved that when the height difference between the highest point of the end surface of the outlet end of the air outlet guide pipe 4 facing the air inflow into the air intake channel 2 and the lowest point of the side facing away from the air inflow into the air intake channel 2 is 2 to 8 mm, the effect of improving the speed and stability of the gas outlet at the outlet port of the end of the air outlet guide pipe 4 extending into the air intake channel 2 is better.

[0048] It should be noted that the specific preferred value of the height difference between the highest point of the end surface of the outlet end of the air outlet guide pipe 4 facing the air inflow into the air inlet channel 2 and the lowest point of the side facing away from the air inflow into the air inlet channel 2 is related to the diameter of the air inlet channel 2 and the diameter of the air outlet guide pipe 4. Specifically, in this embodiment, the height of the highest point of the end surface of the outlet end of the air outlet guide pipe 4 facing the air inflow into the air inlet channel 2 relative to the inner wall of the air inlet channel 2 is 8 mm, and the height of the lowest point of the end surface of the outlet end of the air outlet guide pipe 4 facing away from the air inflow into the air inlet channel 2 relative to the inner wall of the air inlet channel 2 is 4 mm, that is, the height difference between the highest point of the end surface of the outlet end of the air outlet guide pipe 4 facing the air inflow into the air inlet channel 2 and the lowest point of the side facing away from the air inflow into the air inlet channel 2 is 4 mm.

[0049] In one embodiment, an angle β is formed between the flow direction of the gas in the gas outlet guide pipe 4 and the gas outlet direction of the air intake passage 2, wherein 15°<β<75°. That is, the angle β formed between the center line of the gas outlet guide pipe 4 and the center line of the air intake passage 2 is 15° to 75°. Specifically, in this embodiment, the angle β formed between the flow direction of the gas in the gas outlet guide pipe 4 and the gas outlet direction of the air intake passage 2 is 60°.

[0050] like Figure 1-5As shown, an embodiment of the present application further provides a throttle valve, which is applied to a multi-fuel engine, and the throttle valve includes the fuel gas intake structure in any of the above embodiments.

[0051] Specifically, in this embodiment, the throttle valve can also include a throttle valve plate 5 arranged at the intake end of the air intake channel 2, a fuel injector 6 arranged on the side wall of the outlet end of the air intake channel 2, and a thermal insulation pad 7 arranged at the outlet end of the air intake channel 2, the thermal insulation pad 7 has a through hole inside, and the through hole is connected to the air intake channel 2, wherein the throttle valve plate 5 is used to open or close the air intake channel 2, the fuel injector 6 is used to connect the fuel delivery pipeline and spray fuel to the outlet end of the air intake channel 2, and the thermal insulation pad 7 is used to connect the engine cylinder to deliver a fuel and air mixture or a gas and air mixture into the engine cylinder, and to block the heat of the engine cylinder from being transferred to the throttle body 1 to avoid excessive throttle temperature.

[0052] It should be noted that, since the throttle valve includes the gas intake structure in any of the above embodiments, the throttle valve has the same technical effects as the gas intake structures in the above embodiments, which will not be described in detail herein.

[0053] An embodiment of the present application further provides a multi-fuel engine, which includes the throttle valve in the above embodiment.

[0054] It should be noted that, since the multi-fuel engine includes the throttle valve in the above embodiment, the multi-fuel engine has the same technical effect as the throttle valve in the above embodiment, which will not be described in detail here.

[0055] Specifically, in the present embodiment, the multi-fuel engine may be a multi-fuel engine capable of using one of gasoline and fuel oil, and at least one of natural gas and LPG liquefied petroleum gas.

[0056] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application.

Claims

1. A gas intake structure, which is arranged on a throttle, wherein the throttle comprises a throttle body, and the throttle body is provided with an air intake passage passing through the throttle body, characterized in that: The gas intake structure comprises: A gas intake passage is provided in the throttle body, the gas intake passage has an intake port and an outlet port, the intake port of the gas intake passage is used to connect to a gas delivery pipeline, and the outlet port of the gas intake passage is communicated with the air intake passage, wherein: An air outlet guide pipe is provided at the air outlet port of the gas intake passage, and the air outlet guide pipe is inclined toward the air outlet direction of the air intake passage, and at least a portion of the air outlet guide pipe extends into the air intake passage, and an end face of one end of the air outlet guide pipe for air outlet is a smooth face, and a side of the end face of one end of the air outlet guide pipe for air outlet facing the air inflow into the air intake passage is higher than a side facing away from the air inflow into the air intake passage.

2. The gas intake structure according to claim 1, characterized in that: The air outlet guide pipe is a pipe body, one end of which is inserted into the air outlet port of the gas intake passage, and the other end of which extends into the air intake passage.

3. The fuel gas intake structure according to claim 2, characterized in that: The gas outlet guide pipe is detachably connected to the gas inlet passage.

4. The fuel gas intake structure according to claim 2, characterized in that: The air outlet guide pipe is a copper pipe.

5. The fuel gas intake structure according to claim 1, characterized in that: The air outlet guide pipe is integrally formed with the throttle body.

6. The fuel gas intake structure according to any one of claims 1 to 5, characterized in that: An angle α is formed between the end surface of one end of the air outlet guide pipe and the air flow direction in the air intake passage, wherein 30°<α<60°.

7. The fuel gas intake structure according to claim 6, characterized in that: The height difference between the highest point of the end surface of the outlet end of the air outlet guide pipe facing the air inflow into the air intake channel and the lowest point of the side facing away from the air inflow into the air intake channel is 2 to 8 mm.

8. The fuel gas intake structure according to claim 1, characterized in that: An angle β is formed between the flow direction of the gas in the gas outlet guide pipe and the gas outlet direction of the air intake passage, wherein 15°<β<75°.

9. A throttle valve, applied to a multi-fuel engine, characterized in that: The throttle valve comprises the fuel gas intake structure according to any one of claims 1-8.

10. A multi-fuel engine, characterized in that: The multi-fuel engine includes the throttle valve of claim 9.

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