Mixer for natural gas engine and natural gas engine

Abstract

The invention relates to the technical field of natural gas engines, and discloses a mixer for a natural gas engine and the natural gas engine, and the mixer for the natural gas engine comprises a mixer body which comprises an input end and an output end; the electric driving blade is used for adjusting the pressure difference between the input end and the output end of the mixer body; the first pressure monitoring module is used for monitoring the pressure of the input end of the mixer body and generating a first pressure signal; the second pressure monitoring module is used for monitoring the pressure of the output end of the mixer body and generating a second pressure signal; and the electronic control unit is in electric connection and / or communication connection with the electric drive blade, the first pressure monitoring module and the second pressure monitoring module, and the electronic control unit is used for generating a pressure difference signal based on the first pressure signal and the second pressure signal and controlling the rotating speed of the electric drive blade based on the pressure difference signal. According to the mixer for the natural gas engine, the mixing efficiency is improved, meanwhile, the pressure drop is reduced, and the gas inlet efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas engines, and in particular to a mixer for a natural gas engine and a natural gas engine. Background Art

[0002] At present, natural gas engines need to add an exhaust gas recirculation (EGR) system to control emissions, reduce gas consumption and improve power. At the same time, the gas supply method generally adopts manifold single-point injection, so it is necessary to use a mixer to mix air, recirculated exhaust gas and gas. The mixing uniformity and mixing efficiency will have a great impact on the operation of the engine.

[0003] However, existing natural gas engine mixers usually cause a large pressure loss in the airflow in order to improve the mixing efficiency. Summary of the invention

[0004] In view of this, the present invention provides a mixer for a natural gas engine and a natural gas engine to solve the problem of large air flow pressure loss in the existing mixer for a natural gas engine.

[0005] In a first aspect, the present invention provides a mixer for a natural gas engine, comprising:

[0006] The mixer body has an inner wall enclosing a mixing chamber; the mixer body includes an input end and an output end;

[0007] An electric drive blade is rotatably disposed in the mixing chamber, and the electric drive blade is used to adjust the pressure difference between the input end and the output end of the mixer body;

[0008] A first pressure monitoring module, used to monitor the pressure at the input end of the mixer body and generate a first pressure signal; a second pressure monitoring module, used to monitor the pressure at the output end of the mixer body and generate a second pressure signal;

[0009] An electronic control unit is electrically and / or communicatively connected to the electric drive blades and the first pressure monitoring module and the second pressure monitoring module. The electronic control unit is used to generate a pressure difference signal based on the first pressure signal and the second pressure signal, and control the rotation speed of the electric drive blades based on the pressure difference signal.

[0010] Beneficial effects: The mixer for a natural gas engine provided by the present invention adjusts the pressure difference between the input end and the output end of the mixer body by rotatably setting an electric-driven blade in the mixing chamber; monitors the pressure difference between the input end and the output end of the mixer body by setting a first pressure monitoring module at the input end of the mixer body and setting a second pressure monitoring module at the output end of the mixer body; controls the rotation speed of the electric-driven blade based on the pressure difference signal by the electronic control unit, thereby improving the mixing efficiency while reducing the pressure drop caused by turbulence when the mixed gas passes through the mixing chamber, thereby improving the intake efficiency.

[0011] In an optional embodiment, the mixer body includes a first shell segment and a second shell segment, the inner wall of the first shell segment encloses a first accommodating chamber, the first accommodating chamber is used to pass air and recirculated exhaust gas, and the second shell segment encloses a second accommodating chamber, the second accommodating chamber is used to pass fuel gas;

[0012] The mixer body further includes a third housing segment, which is disposed between the first housing segment and the second housing segment, and the inner peripheral wall of the third housing segment encloses a third accommodating cavity, which is communicated with the first accommodating cavity and the second accommodating cavity;

[0013] The electric drive blade is rotatably arranged in the third accommodating chamber.

[0014] Beneficial effect: By arranging the electric drive blades in the third accommodating chamber, the internal space of the mixing chamber can be fully utilized to improve the space utilization rate in the mixing chamber. While improving the mixing efficiency, the intake efficiency of air, recirculated exhaust gas and fuel gas can also be improved.

[0015] In an optional embodiment, the mixer for a natural gas engine further comprises:

[0016] The first spoiler shell is disposed in the first accommodating chamber; the inner peripheral wall of the first spoiler shell encloses a first mixing channel, and the first mixing channel is connected to one end of the third accommodating chamber; the first spoiler blade is fixedly disposed in the first mixing channel;

[0017] The second spoiler shell is arranged in the second accommodating chamber; the inner peripheral wall of the second spoiler shell encloses a second mixing channel, and the second mixing channel is connected to the other end of the third accommodating chamber; the second spoiler blade is fixedly arranged in the second mixing channel.

[0018] Beneficial effects: By arranging a first spoiler blade in the first accommodating chamber, the air and the recirculated exhaust gas are turbulently flowed by the first spoiler blade to form a cyclone, thereby improving the uniformity of mixing and the mixing efficiency; by arranging a second spoiler blade in the second accommodating chamber, the evenly mixed air, the recirculated exhaust gas and the combustion gas are turbulently flowed by the second spoiler blade to form a cyclone, further improving the uniformity of mixing and the mixing efficiency; at the same time, by arranging an electric drive blade in the third accommodating chamber, the pressure drop caused by the turbulence is reduced by the rotation of the electric drive blade, thereby improving both the mixing efficiency and the intake efficiency.

[0019] In an optional embodiment, the first spoiler blade and the second spoiler blade both include a first inverted portion and a second inverted portion, and the first inverted portion and the second inverted portion are arranged at an angle.

[0020] Beneficial effect: The first inverted portion and the second inverted portion are arranged at an angle so that the first spoiler blade and the second spoiler blade form an inverted structure, so that the airflow collides in the first mixing channel and the second mixing channel, and forms a local backflow, thereby improving the uniformity of gas mixing and improving the mixing efficiency; at the same time, by arranging an electric drive blade in the third accommodating chamber, the pressure drop caused by the turbulence can be reduced through the rotation of the electric drive blade, thereby improving both the mixing efficiency and the intake efficiency.

[0021] In an optional embodiment, the outer peripheral wall and the inner peripheral wall of the first spoiler shell are radially spaced apart and form a first annular cavity; the outer peripheral wall of the first spoiler shell is provided with a first air inlet, the first air inlet is connected to the first annular cavity, and the first air inlet is used to introduce recirculated exhaust gas;

[0022] The inner peripheral wall of the first spoiler shell is provided with a first air inlet passage, the first air inlet passage is circumferentially arranged around the inner peripheral wall of the first spoiler shell, and the first air inlet passage is used to connect the first annular cavity with the first mixing passage;

[0023] The outer peripheral wall and the inner peripheral wall of the second spoiler shell are arranged radially spaced apart to form a second annular cavity; the outer peripheral wall of the second spoiler shell is provided with a second air inlet, the second air inlet is connected to the second annular cavity, and the second air inlet is used to introduce fuel gas;

[0024] The inner peripheral wall of the second spoiler shell is provided with a second air inlet passage, which is circumferentially arranged around the inner peripheral wall of the second spoiler shell and is used to connect the second annular cavity with the second mixing passage.

[0025] Beneficial effect: When the recirculated exhaust gas enters the first mixing channel from the first air inlet, it can enter the first mixing channel evenly along the circumferential direction of the first mixing channel, thereby improving the uniformity of mixing of air and recirculated exhaust gas, and further improving the mixing efficiency; when the fuel gas enters the second mixing channel from the second air inlet, it can enter the second mixing channel evenly along the circumferential direction of the second mixing channel, thereby improving the uniformity of mixing of fuel gas, air and recirculated exhaust gas, and further improving the mixing efficiency.

[0026] In an optional embodiment, a third air inlet is provided at one axial end of the first housing segment, the third air inlet is communicated with the first mixing channel, and the third air inlet is used to allow air to enter;

[0027] A mixed gas outlet is formed at one axial end of the second shell segment, the mixed gas outlet is connected to the second mixing channel, and the mixed gas outlet is used to output a mixed gas of air, recirculated exhaust gas and fuel gas;

[0028] The mixer for the natural gas engine also includes a flow stabilizing member, which is installed in the mixed gas outlet.

[0029] Beneficial effect: By setting a flow stabilizer at the outlet of the mixed gas, the airflow is stabilized, so that after the high-speed disordered airflow flows out of the mixer through the flow stabilizer, the airflow direction and pressure are consistent and the density is uniform, thereby improving the uniformity and consistency of the mixed gas when it enters the engine cylinder.

[0030] In an optional embodiment, the first pressure monitoring module includes a first temperature and pressure sensor, and the first temperature and pressure sensor is arranged at an end of the first air inlet and / or the third air inlet away from the mixer body along the gas flow direction;

[0031] The second pressure monitoring module includes a second temperature and pressure sensor, and the second temperature and pressure sensor is arranged at one end of the flow stabilizing member away from the mixer body along the gas flow direction.

[0032] Beneficial effect: By arranging a first temperature and pressure sensor upstream of the first air inlet and / or the third air inlet, the pressure at the input end of the mixer body is monitored, and the pressure of the mixed gas after passing through the flow stabilizer is monitored by the first temperature and pressure sensor, thereby monitoring the pressure at the output end of the mixer body, thereby avoiding the influence of the flow stabilizer on the pressure difference measurement result, and then accurately controlling the rotation speed of the electric drive blade based on the pressure difference signal by the electronic control unit, thereby improving the mixing efficiency and reducing the pressure drop caused by the mixed gas passing through the mixing chamber, thereby improving the intake efficiency.

[0033] In an optional embodiment, the flow stabilizing member is provided with a plurality of through holes along the axial direction, the through holes are communicated with the second mixing channel, and the plurality of through holes are evenly arranged on the radial cross section of the flow stabilizing member.

[0034] Beneficial effect: After the high-speed disordered airflow flows out of the mixer through the flow stabilizing member, the airflow direction and pressure are consistent and the density is uniform.

[0035] In an optional embodiment, the outer peripheral wall of the third shell segment and the inner peripheral wall of the third shell segment are radially spaced apart to form a closed cavity, and the closed cavity is used to accommodate a heat exchange medium;

[0036] The outer peripheral wall of the third shell section is provided with a liquid inlet and a liquid outlet which are connected with the closed cavity, and the liquid inlet and the liquid outlet are connected with the engine water jacket.

[0037] Beneficial effect: The third shell section is provided with a closed cavity and a liquid inlet and a liquid outlet at the same time as the electric drive blades, so that the closed cavity is connected with the engine water jacket through the liquid inlet and the liquid outlet, so that the heat exchange medium that has absorbed heat is directly drained from the engine water jacket into the closed cavity, and then the mixer body can be quickly heated. While improving the air intake efficiency, condensation and freezing of water vapor in the mixer body are avoided, thereby further improving the mixing efficiency.

[0038] In a second aspect, the present invention further provides a natural gas engine, comprising: an engine body, and the mixer for the natural gas engine as described above.

[0039] Beneficial effect: The natural gas engine provided by the present invention adopts the above-mentioned natural gas engine mixer, which improves the mixing efficiency while reducing the pressure drop caused by turbulence when the mixed gas passes through the mixing chamber, avoids condensation and freezing of water vapor in the mixer body, and improves the intake efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A pressure regulating principle diagram of a mixer for a natural gas engine according to an embodiment of the present invention;

[0042] Figure 2 A top view of a mixer for a natural gas engine according to an embodiment of the present invention;

[0043] Figure 3 for Figure 2 Sectional view of section AA;

[0044] Figure 4 for Figure 3A cross-sectional view of the mixer body;

[0045] Figure 5 for Figure 3 A cross-sectional view of the mixer body and the flow stabilizing member hidden in the middle;

[0046] Figure 6 A three-dimensional diagram of a turbulent blade of a mixer for a natural gas engine according to an embodiment of the present invention;

[0047] Figure 7 for Figure 2 Cross-sectional view of the middle BB section;

[0048] Figure 8 A heating principle diagram of a mixer for a natural gas engine according to an embodiment of the present invention;

[0049] Fig. 9 A three-dimensional diagram of a flow stabilizing member of a mixer for a natural gas engine according to an embodiment of the present invention;

[0050] Fig.10 The present invention is a pressure measurement principle diagram of a mixer for a natural gas engine according to an embodiment of the present invention.

[0051] Description of reference numerals:

[0052] 10. mixer body; 100. mixing chamber; 101. first accommodating chamber; 102. second accommodating chamber; 103. third accommodating chamber; 11. first housing section; 111. third air inlet; 12. second housing section; 121. mixed gas outlet; 13. third housing section; 131. closed chamber; 132. liquid inlet; 133. liquid outlet;

[0053] 20. Electric drive blades;

[0054] 30. A first pressure monitoring module; 31. A first temperature and pressure sensor;

[0055] 40. A second pressure monitoring module; 41. A second temperature and pressure sensor;

[0056] 50. Electronic control unit;

[0057] 61, first spoiler housing; 611, first mixing channel; 612, first annular cavity; 613, first air inlet; 614, first air inlet channel; 62, first spoiler blade; 63, second spoiler housing; 631, second mixing channel; 632, second annular cavity; 633, second air inlet; 634, second air inlet channel; 64, second spoiler blade; 651, first inverted portion; 652, second inverted portion;

[0058] 70. Flow stabilizing member; 71. Through hole;

[0059] 80. Engine water jacket. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0061] In order to improve the mixing efficiency, the mixer in the related art usually sets an impeller in the inner cavity of the mixer so that the mixed gas forms a cyclone through the impeller turbulence to improve the mixing uniformity. However, this will cause a large pressure loss of the airflow, and the outflowing airflow is relatively turbulent, and the uniformity and consistency of the intake air are poor when entering each cylinder.

[0062] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0063] According to an embodiment of the present invention, on the one hand, a mixer for a natural gas engine is provided, comprising:

[0064] Mixer body 10, please combine together Figure 1 and Figure 4 As shown, its inner wall encloses a mixing chamber 100; the mixer body 10 includes an input end and an output end, and both the input end and the output end are connected to the mixing chamber 100;

[0065] The electric drive blade 20 is rotatably disposed in the mixing chamber 100, and the electric drive blade 20 is used to adjust the pressure difference between the input end and the output end of the mixer body 10;

[0066] The first pressure monitoring module 30 is used to monitor the pressure at the input end of the mixer body 10 and generate a first pressure signal; the second pressure monitoring module 40 is used to monitor the pressure at the output end of the mixer body 10 and generate a second pressure signal;

[0067] The electronic control unit 50 is electrically and / or communicatively connected to the electric drive blade 20 and the first pressure monitoring module 30 and the second pressure monitoring module 40. The electronic control unit 50 is used to generate a pressure difference signal based on the first pressure signal and the second pressure signal, and control the rotation speed of the electric drive blade 20 based on the pressure difference signal.

[0068] It should be noted that the input end of the mixer body 10 is used to input air, recirculated exhaust gas and / or fuel gas, the mixing chamber 100 is used to fully mix the air, recirculated exhaust gas and fuel gas, and the output end of the mixer body 10 is used to output a mixed gas of air, recirculated exhaust gas and fuel gas, wherein the input end refers to the general term for the part and / or component of the mixer body 10 for introducing or receiving air, recirculated exhaust gas and / or fuel gas raw materials, and does not specifically refer to a certain part or component. The electric drive blade 20 is a suction blade. During the rotation of the electric drive blade 20, the pressure in the area near the electric drive blade 20 will be lower than the pressure at the input end of the mixer body 10, and a negative pressure area will be formed near the electric drive blade 20 compared to the input end of the mixer body 10, so that the airflow can smoothly enter the mixing chamber 100.

[0069] During operation, when the pressure difference between the input and output ends of the mixer body 10 exceeds the set threshold range, the electronic control unit 50 controls the rotation speed of the electric drive blade 20 to increase based on the pressure difference signal, thereby reducing the pressure difference between the input and output ends of the mixer body 10, increasing the intake kinetic energy, and thereby reducing the air flow pressure loss while improving the mixing efficiency; when the pressure difference between the input and output ends of the mixer body 10 is reduced to within the set threshold range, the electronic control unit 50 controls the rotation speed of the electric drive blade 20 to decrease based on the pressure difference signal.

[0070] The mixer for a natural gas engine provided by the present invention adjusts the pressure difference between the input end and the output end of the mixer body 10 by rotatably setting the electric drive blade 20 in the mixing chamber 10; monitors the pressure difference between the input end and the output end of the mixer body 10 by setting a first pressure monitoring module 30 at the input end of the mixer body 10 and setting a second pressure monitoring module 40 at the output end of the mixer body 10; and controls the rotation speed of the electric drive blade 20 based on the pressure difference signal by the electronic control unit 50, thereby improving the mixing efficiency while reducing the pressure drop caused by the turbulence when the mixed gas passes through the mixing chamber 100, thereby improving the intake efficiency.

[0071] In some embodiments, see Figure 4 As shown, the mixer body 10 includes a first shell segment 11 and a second shell segment 12. The inner wall of the first shell segment 11 encloses a first accommodating chamber 101, and the first accommodating chamber 101 is used to pass air and recirculated exhaust gas. The second shell segment 12 encloses a second accommodating chamber 102, and the second accommodating chamber 102 is used to pass fuel gas.

[0072] The mixer body 10 further includes a third housing segment 13, which is disposed between the first housing segment 11 and the second housing segment 12. The inner peripheral wall of the third housing segment 13 encloses a third accommodating chamber 103, which is communicated with the first accommodating chamber 101 and the second accommodating chamber 102.

[0073] Please combine Figure 3 As shown, the electrically driven blade 20 is rotatably disposed in the third accommodating chamber 103 .

[0074] In this embodiment, by arranging the electric drive blades 20 in the third accommodating chamber 103, the internal space of the mixing chamber 100 can be fully utilized to improve the space utilization rate in the mixing chamber 100. While improving the mixing efficiency, the intake efficiency of air, recirculated exhaust gas and fuel gas can also be improved.

[0075] Furthermore, the first shell segment 11 , the second shell segment 12 and the third shell segment 13 are an integrally formed structure.

[0076] In some embodiments, please combine Figure 3 , Figure 4 and Figure 5 As shown, the mixer for the natural gas engine also includes:

[0077] The first spoiler housing 61 is disposed in the first accommodating chamber 101; the inner peripheral wall of the first spoiler housing 61 encloses a first mixing channel 611, and the first mixing channel 611 is connected to one end of the third accommodating chamber 103; the first spoiler blade 62 is fixedly disposed in the first mixing channel 611;

[0078] The second spoiler shell 63 is arranged in the second accommodating chamber 102; the inner peripheral wall of the second spoiler shell 63 encloses a second mixing channel 631, and the second mixing channel 631 is connected to the other end of the third accommodating chamber 103; the second spoiler blade 64 is fixedly arranged in the second mixing channel 631.

[0079] During the assembly process, the first spoiler blade 62 and the first spoiler shell 61 can be pre-assembled to form an integral structural module, and then installed in the first accommodating cavity 101; the second spoiler blade 64 and the second spoiler shell 63 can be pre-assembled to form an integral structural module, and then installed in the second accommodating cavity 102, which is beneficial to improving assembly accuracy and assembly efficiency.

[0080] By setting a first spoiler blade 62 in the first accommodating chamber 101, the air and the recirculated exhaust gas are turbulently formed into a cyclone through the first spoiler blade 62, thereby improving the uniformity of mixing and the mixing efficiency; by setting a second spoiler blade 64 in the second accommodating chamber 102, the evenly mixed air and the recirculated exhaust gas and the combustion gas are turbulently formed into a cyclone through the second spoiler blade 64, further improving the uniformity of mixing and the mixing efficiency; at the same time, by setting an electric drive blade 20 in the third accommodating chamber 103, the pressure drop caused by the turbulence is reduced by the rotation of the electric drive blade 20, thereby improving both the mixing efficiency and the intake efficiency.

[0081] In some embodiments, see Figure 6 As shown, the first spoiler blade 62 and the second spoiler blade 64 both include a first inverted portion 651 and a second inverted portion 652 , and the first inverted portion 651 and the second inverted portion 652 are arranged at an angle.

[0082] It should be noted that the first spoiler blade 62 and the second spoiler blade 64 have the same structure, so the following description will be made by taking the first spoiler blade 62 as an example. Figure 6 As shown, a plurality of first spoiler blades 62 are evenly spaced relative to the central axis along the circumferential direction, and each first spoiler blade 62 includes a first inverted portion 651 and a second inverted portion 652. Figure 6 As shown, the folding angle of the second inverted portion 652 relative to the first inverted portion 651 is α, and the value range of α is 30°≤α≤40°; if α is too small, it is easy to cause the first inverted portion 651 and the second inverted portion 652 to tend to be straight, resulting in the inability of the gas to fully collide and mix, thereby reducing the mixing uniformity. Therefore, α needs to satisfy α≥30°; if α is too large, it is easy to increase the flow resistance, resulting in an increase in the pressure loss of the gas. Therefore, α also needs to satisfy α≤40°.

[0083] In this embodiment, the first inverted portion 651 and the second inverted portion 652 are arranged at an angle so that the first spoiler blade 62 and the second spoiler blade 64 form an inverted structure, so that the airflow collides in the first mixing channel 611 and the second mixing channel 631, and forms a local backflow, thereby improving the uniformity of gas mixing and improving the mixing efficiency; at the same time, by arranging the electric drive blade 20 in the third accommodating chamber 103, the pressure drop caused by the turbulence can be reduced through the rotation of the electric drive blade 20, thereby improving both the mixing efficiency and the intake efficiency.

[0084] In some embodiments, see Figure 5 As shown, the outer peripheral wall and the inner peripheral wall of the first spoiler housing 61 are radially spaced apart to form a first annular cavity 612; the outer peripheral wall of the first spoiler housing 61 is provided with a first air inlet 613, which is connected to the first annular cavity 612, and is used to introduce recirculated exhaust gas;

[0085] The inner peripheral wall of the first spoiler housing 61 is provided with a first air inlet passage 614, which is circumferentially arranged around the inner peripheral wall of the first spoiler housing 61. The first air inlet passage 614 is used to connect the first annular cavity 612 with the first mixing passage 611, so that the recirculated exhaust gas can enter the first mixing passage 611 uniformly along the circumferential direction of the first mixing passage 611 when entering the first air inlet 613, thereby improving the uniformity of mixing of air and recirculated exhaust gas, and further improving the mixing efficiency;

[0086] The outer peripheral wall and the inner peripheral wall of the second spoiler shell 63 are radially spaced apart to form a second annular cavity 632; the outer peripheral wall of the second spoiler shell 63 is provided with a second air inlet 633, which is in communication with the second annular cavity 632 and is used to introduce fuel gas;

[0087] A second air intake channel 634 is provided on the inner circumferential wall of the second spoiler shell 63. The second air intake channel 634 is circumferentially arranged around the inner circumferential wall of the second spoiler shell 63. The second air intake channel 634 is used to connect the second annular cavity 632 with the second mixing channel 631, so that when the fuel gas enters the second mixing channel 631 from the second air inlet 633, it can enter the second mixing channel 631 evenly along the circumferential direction of the second mixing channel 631, thereby improving the uniformity of mixing of the fuel gas, air and recirculated exhaust gas, and further improving the mixing efficiency.

[0088] In some embodiments, please combine Figure 3 and Figure 4 As shown, a third air inlet 111 is provided at one axial end of the first housing segment 11, the third air inlet 111 is connected to the first mixing channel 611, and the third air inlet 111 is used to allow air to enter;

[0089] A mixed gas outlet 121 is formed at one axial end of the second housing section 12. The mixed gas outlet 121 is connected to the second mixing channel 631. The mixed gas outlet 121 is used to output a mixed gas of air, recirculated exhaust gas and fuel gas.

[0090] The mixer for the natural gas engine further includes a flow stabilizer 70 , which is installed in the mixed gas outlet 121 .

[0091] By setting a flow stabilizer 70 at the mixture outlet 121 to stabilize the airflow, the high-speed disordered airflow has a consistent airflow direction and pressure and uniform density after flowing out of the mixer through the flow stabilizer 70, thereby improving the uniformity and consistency of the mixture when it enters the engine cylinder.

[0092] In some embodiments, the first pressure monitoring module 30 includes a first temperature and pressure sensor 31, see Fig.10 As shown, the first temperature and pressure sensor 31 is disposed at the first air inlet 613 and / or the third air inlet 111 along the gas flow direction away from the end of the mixer body 10;

[0093] The second pressure monitoring module 40 includes a second temperature and pressure sensor 41 . The second temperature and pressure sensor 41 is disposed at one end of the flow stabilizing member 70 away from the mixer body 10 along the gas flow direction.

[0094] In this embodiment, a first temperature and pressure sensor 31 is arranged upstream of the first air inlet 613 and / or the third air inlet 111 to monitor the pressure at the input end of the mixer body 10. The pressure of the mixed gas after passing through the flow stabilizer 70 is monitored by the first temperature and pressure sensor 31, thereby monitoring the pressure at the output end of the mixer body 10. This avoids the influence of the flow stabilizer 70 on the pressure difference measurement result, and then the electronic control unit 50 accurately controls the rotation speed of the electric drive blade 20 based on the pressure difference signal. While improving the mixing efficiency, the pressure drop caused by the mixed gas passing through the mixing chamber 100 is reduced, thereby improving the intake efficiency.

[0095] In some embodiments, see Fig. 9 As shown, the flow stabilizer 70 is provided with a plurality of through holes 71 along the axial direction, the through holes 71 are connected to the second mixing channel 631, and the plurality of through holes 71 are evenly arranged on the radial cross section of the flow stabilizer 70, so that after the high-speed disordered airflow passes through the flow stabilizer 70 and flows out of the mixer, the airflow direction and pressure are consistent and the density is uniform.

[0096] In some embodiments, please combine Figure 4 , Figure 7 and Figure 8 As shown, the outer peripheral wall of the third shell segment 13 and the inner peripheral wall of the third shell segment 13 are arranged radially spaced apart to form a closed cavity 131, and the closed cavity 131 is used to accommodate a heat exchange medium;

[0097] The outer peripheral wall of the third housing section 13 is provided with a liquid inlet 132 and a liquid outlet 133 which are in communication with the sealed chamber 131 . The liquid inlet 132 and the liquid outlet 133 are in communication with the engine water jacket 80 .

[0098] It should be noted that when the engine is working, the internal environment of the cylinder is in a high temperature state due to the combustion process. A heat exchange medium circulates in the engine water jacket 80, thereby absorbing the heat generated when the engine is working. After absorbing the heat, the heat exchange medium releases the heat to the outside through the radiator, and then the heat exchange medium is recycled back to the engine, forming a continuous cooling circulation system to prevent the engine from overheating.

[0099] The third shell section 13 is provided with a closed cavity 131, a liquid inlet 132 and a liquid outlet 133 while providing the electric drive blades 20, so that the closed cavity 131 is connected with the engine water jacket 80 through the liquid inlet 132 and the liquid outlet 133, so that the heat exchange medium after absorbing heat is directly drained from the engine water jacket 80 to the closed cavity 131, and then the mixer body 10 can be quickly heated, and while the air intake efficiency is improved, the condensation and freezing of water vapor in the mixer body 10 is avoided, thereby further improving the mixing efficiency.

[0100] According to an embodiment of the present invention, on the other hand, a natural gas engine is provided, comprising: an engine body, and the mixer for the natural gas engine as described above.

[0101] The natural gas engine provided by the present invention adopts the above-mentioned natural gas engine mixer, which improves the mixing efficiency while reducing the pressure drop caused by turbulence when the mixed gas passes through the mixing chamber 100, avoids condensation and freezing of water vapor in the mixer body 10, and improves the intake efficiency.

[0102] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A mixer for a natural gas engine, characterized in that: include: A mixer body (10), the inner wall of which encloses a mixing chamber (100); the mixer body (10) comprises an input end and an output end; An electric drive blade (20) is rotatably disposed in the mixing chamber (100), and the electric drive blade (20) is used to adjust the pressure difference between the input end and the output end of the mixer body (10); A first pressure monitoring module (30) is used to monitor the pressure at the input end of the mixer body (10) and generate a first pressure signal; a second pressure monitoring module (40) is used to monitor the pressure at the output end of the mixer body (10) and generate a second pressure signal; An electronic control unit (50) is electrically connected and / or communicatively connected to the electric drive blade (20) and the first pressure monitoring module (30) and the second pressure monitoring module (40), and the electronic control unit (50) is used to generate a pressure difference signal based on the first pressure signal and the second pressure signal, and control the rotation speed of the electric drive blade (20) based on the pressure difference signal.

2. The mixer for a natural gas engine according to claim 1, characterized in that: The mixer body (10) comprises a first shell section (11) and a second shell section (12); the inner wall of the first shell section (11) encloses a first accommodating chamber (101); the first accommodating chamber (101) is used to introduce air and recirculated exhaust gas; the second shell section (12) encloses a second accommodating chamber (102); the second accommodating chamber (102) is used to introduce fuel gas; The mixer body (10) further comprises a third housing segment (13), the third housing segment (13) being arranged between the first housing segment (11) and the second housing segment (12), the inner peripheral wall of the third housing segment (13) enclosing a third accommodating chamber (103), the third accommodating chamber (103) being in communication with the first accommodating chamber (101) and the second accommodating chamber (102); The electrically driven blade (20) is rotatably disposed in the third accommodating chamber (103).

3. The mixer for a natural gas engine according to claim 2, characterized in that: The natural gas engine mixer also includes: a first spoiler shell (61) disposed in the first accommodating chamber (101); an inner peripheral wall of the first spoiler shell (61) encloses a first mixing channel (611), the first mixing channel (611) being connected to one end of the third accommodating chamber (103); and a first spoiler blade (62) fixedly disposed in the first mixing channel (611); A second spoiler shell (63) is arranged in the second accommodating chamber (102); the inner peripheral wall of the second spoiler shell (63) encloses a second mixing channel (631), and the second mixing channel (631) is connected to the other end of the third accommodating chamber (103); and a second spoiler blade (64) is fixedly arranged in the second mixing channel (631).

4. The mixer for a natural gas engine according to claim 3, characterized in that: The first spoiler blade (62) and the second spoiler blade (64) both comprise a first inverted portion (651) and a second inverted portion (652), and the first inverted portion (651) and the second inverted portion (652) are arranged at an angle.

5. The mixer for a natural gas engine according to claim 3, characterized in that: The outer peripheral wall and the inner peripheral wall of the first spoiler shell (61) are arranged at intervals along the radial direction to form a first annular cavity (612); the outer peripheral wall of the first spoiler shell (61) is provided with a first air inlet (613), the first air inlet (613) is connected to the first annular cavity (612), and the first air inlet (613) is used to introduce recirculated exhaust gas; The inner peripheral wall of the first spoiler shell (61) is provided with a first air inlet passage (614), the first air inlet passage (614) is circumferentially arranged around the inner peripheral wall of the first spoiler shell (61), and the first air inlet passage (614) is used to connect the first annular cavity (612) with the first mixing passage (611); The outer peripheral wall and the inner peripheral wall of the second spoiler shell (63) are arranged at intervals along the radial direction to form a second annular cavity (632); the outer peripheral wall of the second spoiler shell (63) is provided with a second air inlet (633), the second air inlet (633) is communicated with the second annular cavity (632), and the second air inlet (633) is used to introduce fuel gas; The inner peripheral wall of the second spoiler shell (63) is provided with a second air inlet channel (634), and the second air inlet channel (634) is circumferentially arranged around the inner peripheral wall of the second spoiler shell (63), and the second air inlet channel (634) is used to connect the second annular cavity (632) with the second mixing channel (631).

6. The mixer for a natural gas engine according to claim 5, characterized in that: A third air inlet (111) is provided at one axial end of the first shell section (11), the third air inlet (111) being in communication with the first mixing channel (611), and the third air inlet (111) being used for introducing air; A mixed gas outlet (121) is provided at one axial end of the second shell section (12), the mixed gas outlet (121) is connected to the second mixing channel (631), and the mixed gas outlet (121) is used to output a mixed gas of air, recirculated exhaust gas and fuel gas; The mixer for a natural gas engine further comprises a flow stabilizing member (70), wherein the flow stabilizing member (70) is installed in the mixed gas outlet (121).

7. The mixer for a natural gas engine according to claim 6, characterized in that: The first pressure monitoring module (30) comprises a first temperature and pressure sensor (31), and the first temperature and pressure sensor (31) is arranged at an end of the first air inlet (613) and / or the third air inlet (111) away from the mixer body (10) along the gas flow direction; The second pressure monitoring module (40) comprises a second temperature and pressure sensor (41), and the second temperature and pressure sensor (41) is arranged at one end of the flow stabilizing member (70) away from the mixer body (10) along the gas flow direction.

8. The mixer for a natural gas engine according to claim 6, characterized in that: The flow stabilizing member (70) is provided with a plurality of through holes (71) along the axial direction, the through holes (71) are connected to the second mixing channel (631), and the plurality of through holes (71) are evenly arranged on the radial cross section of the flow stabilizing member (70).

9. The mixer for a natural gas engine according to any one of claims 2 to 8, characterized in that: The outer peripheral wall of the third shell segment (13) and the inner peripheral wall of the third shell segment (13) are arranged radially spaced apart to form a closed cavity (131), wherein the closed cavity (131) is used to accommodate a heat exchange medium; The outer peripheral wall of the third housing section (13) is provided with a liquid inlet (132) and a liquid outlet (133) which are in communication with the closed chamber (131); the liquid inlet (132) and the liquid outlet (133) are in communication with the engine water jacket (80).

10. A natural gas engine, characterized in that: include: An engine body, and a mixer for a natural gas engine as claimed in any one of claims 1 to 9.

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