Mixer for gas engine

Abstract

A mixer suitable for a gas engine belongs to the technical field of fuel mixing and comprises a mixer body, a fuel gas inlet connector, a fuel gas inlet pipe, a fuel mixed gas core, a tail gas mixed gas core and a pressure sensor. The fuel mixed gas core is sequentially divided into a fuel mixed gas core first-stage convergence area, a fuel mixed gas core second-stage convergence area and a fuel mixed gas core smooth area from front to back, and the tail gas mixed gas core is sequentially divided into a tail gas mixed gas core convergence area, a tail gas mixed gas core smooth area and a tail gas mixed gas core diffusion area from front to back. The gas flow rate is gradually increased through two-stage convergence at the inlet of the mixer, the gas pressure is gradually reduced, and the pressure in a smooth area is relatively stable. An outlet of the fuel mixer is divided into three stages of convergence, smoothing and diffusion, tail gas is conveniently guided in the convergence region, and pressure is recovered in the diffusion section. According to the utility model, gas entering each cylinder of the engine is uniformly distributed, and the gas inflow of each cylinder is uniform, so that the combustion efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to a mixer in the technical field of gas mixing, in particular to a mixer for a gas engine which can evenly mix three gases, namely fuel, air and tail gas. Background Art

[0002] As air pollution becomes more and more serious, the conditions for tail gas emissions in the production process or use process in various fields are becoming more and more stringent. The application of alternative fuels for engines can reduce air pollution. The alternative fuels used in engines are mainly alcohol fuels, dimethyl ether, biofuels and gas fuels. Gas fuel is an important part of available energy and is called the third largest energy after coal and oil. In addition to compressed natural gas and liquefied petroleum gas, it also includes biogas, coalbed methane and blast furnace gas.

[0003] For gas engines, complete combustion of gas is one of the most important requirements. However, to date, many mixers have the problem of insufficient mixing of fuel gas and air, resulting in dangerous phenomena such as detonation and fire. Summary of the invention

[0004] Aiming at the deficiencies of the prior art, the utility model provides a mixer for a gas engine, which has a simple structure and can evenly mix the three gases of fuel, air and tail gas.

[0005] The utility model is realized by the following technical scheme, the utility model comprises a mixer body, a fuel gas intake joint, a fuel intake pipe, a fuel mixture core, an exhaust gas mixture core, and a pressure sensor, the interior of the fuel mixture core is a through-hole structure, the fuel mixture core is divided into a fuel mixture core primary convergence area, a fuel mixture core secondary convergence area, and a fuel mixture core smoothing area from front to back, and the exhaust gas mixture core is divided into an exhaust gas mixture core convergence area, an exhaust gas mixture core smoothing area, and an exhaust gas mixture core diffusion area from front to back; the fuel mixture The first-level convergence area of ​​the gas core and the second-level convergence area of ​​the fuel mixture core are both contracted structures, and the smooth area of ​​the fuel mixture core is an equal-section structure; the convergence area of ​​the exhaust mixture core is a contracted structure, the smooth area of ​​the exhaust mixture core is an equal-section structure, and the diffusion area of ​​the exhaust mixture core is an expanded structure. The outlet cross-sectional area of ​​the smooth area of ​​the fuel mixture core is smaller than the cross-sectional area of ​​the inlet of the exhaust mixture core convergence area. The outlet of the smooth area of ​​the fuel mixture core is nested in the convergence area of ​​the exhaust mixture core. The fuel mixture core and the exhaust mixture core are nested in the mixer body. The air flows from the fuel The mixture flows in from the front end inlet of the primary convergence zone of the mixture core, and flows out from the rear end outlet of the exhaust mixture core diffusion zone; a partition is arranged on the outer wall of the fuel mixture core, and the outer wall of the fuel mixture core, the partition, and the inner wall of the mixer body form a fuel storage chamber, and the outer wall of the fuel mixture core, the outer wall of the exhaust mixture core convergence zone, the outer wall of the exhaust mixture core smooth zone, and the inner wall of the mixer body form an exhaust storage chamber; a fuel gas inlet is arranged on the wall surface of the primary convergence zone of the fuel mixture core; a fuel gas intake joint is installed at the front end of the fuel intake pipe, and the rear end of the fuel intake pipe is connected with the fuel storage chamber, and the fuel in the fuel storage chamber enters the primary convergence zone of the fuel mixture core through the fuel gas inlet; the exhaust gas storage chamber is connected with the exhaust gas inlet arranged on the wall surface of the mixer body, and the exhaust gas in the exhaust gas storage chamber flows into the exhaust mixture core convergence zone through the channel between the fuel mixture core smooth zone and the exhaust mixture core convergence zone; the pressure sensor is arranged on the wall surface of the mixer body, and the air intake channel of the pressure sensor is connected with the air intake hole in the middle part of the fuel mixture core smooth zone.

[0006] Furthermore, in the utility model, the cross-sectional areas of the internal cavities of the first-level convergence area of ​​the fuel mixture core, the second-level convergence area of ​​the fuel mixture core, the smoothing area of ​​the fuel mixture core, the convergence area of ​​the exhaust gas mixture core, the smoothing area of ​​the exhaust gas mixture core, and the diffusion area of ​​the exhaust gas mixture core are all circular.

[0007] Furthermore, in the present invention, the fuel gas inlets are arranged in an array on the wall surface of the primary convergence area of ​​the fuel mixture core.

[0008] Furthermore, in the present invention, the inlet cross-sectional area of ​​the primary convergence zone of the fuel mixture core is equal to the outlet cross-sectional area of ​​the diffusion zone of the exhaust gas mixture core.

[0009] Compared with the prior art, the utility model has the following beneficial effects: the utility model has reasonable design and simple structure, and the gas forms a mixed gas after passing through the mixer. The gas is mixed and turbulent inside to achieve an optimal distribution state, so that the gas entering each cylinder of the engine is evenly distributed, and the intake volume of each cylinder is even, thereby improving the combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0011] Figure 2 for Figure 1 A top view of

[0012] Figure 3 for Figure 1 Schematic diagram of the structure of the AA section;

[0013] Among them, 1. mixer body, 2. fuel gas intake connector, 3. fuel intake pipe, 4. fuel mixture core, 5. exhaust gas mixture core, 6. pressure sensor, 7. fuel storage chamber, 8. exhaust gas storage chamber, 401. primary convergence area of ​​fuel mixture core, 402. secondary convergence area of ​​fuel mixture core, 403. smoothing area of ​​fuel mixture core, 404. partition, 405. fuel gas inlet, 501. convergence area of ​​exhaust gas mixture core, 501. smoothing area of ​​exhaust gas mixture core, 503. diffusion area of ​​exhaust gas mixture core. DETAILED DESCRIPTION

[0014] In order to make the contents of the present invention easier to understand, the technical scheme of the present invention is further explained below in conjunction with specific implementation methods. The examples are only used to illustrate the present invention, but the present invention is not limited to the contents. The operation methods in the following examples without specifying specific conditions are usually carried out under conventional conditions or in accordance with the product instructions. The chemical reagents without specifying the manufacturer are all conventional medicines that comply with national standards and can be purchased on the market.

[0015] Example

[0016] like Figures 1 to 3As shown, the utility model includes a mixer body 1, a fuel gas intake connector 2, a fuel intake pipe 3, a fuel mixture core 4, an exhaust gas mixture core 5, and a pressure sensor 6. The interior of the fuel mixture core 4 is a through-hole structure. The fuel mixture core 4 is divided into a fuel mixture core primary convergence area 401, a fuel mixture core secondary convergence area 402, and a fuel mixture core smoothing area 403 from front to back. The exhaust gas mixture core 5 is divided into an exhaust gas mixture core convergence area 501, an exhaust gas mixture core smoothing area 502, and an exhaust gas mixture core diffusion area 503 from front to back; the fuel mixture core primary convergence area 401, the fuel mixture core secondary convergence area 402, and the fuel mixture core smoothing area 403. The secondary convergence area 402 of the gas core is a contracted structure, and the fuel mixture core smooth area 403 is a uniform cross-sectional structure; the exhaust mixture core convergence area 501 is a contracted structure, the exhaust mixture core smooth area 502 is a uniform cross-sectional structure, and the exhaust mixture core diffusion area 503 is an expanded structure. The outlet cross-sectional area of ​​the fuel mixture core smooth area 403 is smaller than the inlet cross-sectional area of ​​the exhaust mixture core convergence area 501. The outlet of the fuel mixture core smooth area 403 is nested in the exhaust mixture core convergence area 501, and the fuel mixture core 4 and the exhaust mixture core 5 are nested in the mixer body 1. The air converges from the first level of the fuel mixture core The mixed gas flows into the front inlet of the zone 401, and flows out from the rear end outlet of the exhaust gas mixture core diffusion zone 503; a partition 404 is arranged on the outer wall of the fuel mixture core 4, the outer wall of the fuel mixture core 4, the partition 404, and the inner wall of the mixer body 1 form a fuel storage chamber 7, and the outer wall of the fuel mixture core 4, the outer wall of the exhaust gas mixture core convergence zone 501, the outer wall of the exhaust gas mixture core smooth zone 502, and the inner wall of the mixer body 1 form an exhaust gas storage chamber 8; a fuel gas inlet 405 is arranged on the wall surface of the fuel mixture core primary convergence zone 401; a fuel gas intake pipe 3 is installed at the front end thereof. The joint 2 and the rear end of the fuel intake pipe 3 are connected to the fuel storage chamber 7, and the fuel in the fuel storage chamber 7 enters the primary convergence area 401 of the fuel mixture core through the fuel gas inlet 405; the exhaust gas storage chamber 8 is connected to the exhaust gas inlet arranged on the wall of the mixer body 1, and the exhaust gas in the exhaust gas storage chamber 8 flows into the exhaust gas mixture core convergence area 501 through the channel between the fuel mixture core smooth area 403 and the exhaust gas mixture core convergence area 501; the pressure sensor 6 is arranged on the wall of the mixer body 1, and the air intake channel of the pressure sensor 6 is connected to the air intake hole in the middle part of the fuel mixture core smooth area 403. The cross-sectional areas of the internal cavities of the fuel mixture core primary convergence area 401, the fuel mixture core secondary convergence area 402, the fuel mixture core smooth area 403, the exhaust gas mixture core convergence area 501, the exhaust gas mixture core smooth area 502, and the exhaust gas mixture core diffusion area 503 are all circular. The fuel gas inlet 405 is arranged in an array on the wall of the fuel mixture core primary convergence area 401.

[0017] In the implementation of the utility model, the entire mixer is installed downstream of the throttle and upstream of the intake manifold. The fuel mixer core 2 introduces gas through two inlets, namely the fuel inlet and the air inlet. The fuel inlet is a plurality of diverging holes arranged in an annular shape, and the diverging holes are used to diverge the fuel gas; the air inlet is a two-stage air convergence. The air flow rate increases and the pressure decreases through the first stage of convergence, and then the second stage of convergence has a faster speed and lower pressure. The converged gas enters the smooth area, and the pressure in the smooth area is the lowest, which is convenient for the introduction of exhaust gas.

[0018] The exhaust gas enters the exhaust gas mixer core 3 after being introduced into the exhaust gas through the mixer housing. The exhaust gas mixer core 3 is composed of three parts: convergence, smoothing, and diffusion. The convergence is the exhaust gas inlet area. The inlet area increases the exhaust gas flow rate and reduces the pressure to facilitate the introduction of the exhaust gas. The exhaust gas mixture core smoothing area 502 is downstream of the fuel mixer core 2. The pressure is low and the flow rate is fast, which is convenient for gas mixing and turbulence. The exhaust gas can be introduced into the mixer cavity at a relatively low pressure. The exhaust gas merges with the air and fuel gas before reaching the smoothing area. The diffusion area is the process in which the pressure of the three gases gradually recovers. Finally, the three gases are mixed and enter the engine intake manifold.

[0019] The pressure sensor 6 is installed on the shell and measures the pressure of the fuel mixture core smooth area 403 through the measuring port. The pressure port is set at the midpoint of the smooth area. The gas pressure here is stable and convenient for measuring the gas pressure for calculating the air intake volume.

[0020] The fuel gas pipe 3 is installed on the mixer housing, and the outlet is arranged at the primary convergence area 401 of the fuel mixture core. The fuel gas pipe 3 is used to introduce fuel gas.

[0021] The above embodiments are merely illustrative of the design principle and use of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A mixer suitable for a gas engine, comprising a mixer body (1), a fuel gas intake connector (2), and a fuel intake pipe (3), characterized in that: It also includes a fuel mixture core (4), an exhaust gas mixture core (5), and a pressure sensor (6); the interior of the fuel mixture core (4) is a through-hole structure; the fuel mixture core (4) is divided into a fuel mixture core primary convergence area (401), a fuel mixture core secondary convergence area (402), and a fuel mixture core smoothing area (403) from front to back; and the exhaust gas mixture core (5) is divided into an exhaust gas mixture core convergence area (501), an exhaust gas mixture core smoothing area (502), and an exhaust gas mixture core diffusion area (503) from front to back; The first-level convergence area (401) of the fuel mixture core and the second-level convergence area (402) of the fuel mixture core are both of a contracted structure, and the smooth area (403) of the fuel mixture core is of a uniform cross-sectional structure; the convergence area (501) of the exhaust gas mixture core is of a contracted structure, the smooth area (502) of the exhaust gas mixture core is of a uniform cross-sectional structure, and the diffusion area (503) of the exhaust gas mixture core is of an expanded structure; the outlet cross-sectional area of ​​the smooth area (403) of the fuel mixture core is smaller than the inlet cross-sectional area of ​​the convergence area (501) of the exhaust gas mixture core, the outlet of the smooth area (403) of the fuel mixture core is nested in the convergence area (501) of the exhaust gas mixture core, the fuel mixture core (4) and the exhaust gas mixture core (5) are nested in the mixer body (1), and air flows in from the front inlet of the first-level convergence area (401) of the fuel mixture core, and the mixture flows out from the rear outlet of the diffusion area (503) of the exhaust gas mixture core; The outer wall of the fuel mixture core (4) is provided with a partition (404); the outer wall of the fuel mixture core (4), the partition (404) and the inner wall of the mixer body (1) form a fuel storage chamber (7); the outer wall of the fuel mixture core (4), the outer wall of the exhaust gas mixture core convergence area (501), the outer wall of the exhaust gas mixture core smooth area (502) and the inner wall of the mixer body (1) form an exhaust gas storage chamber (8); a fuel gas inlet (405) is provided on the wall surface of the primary convergence area (401) of the fuel mixture core; The front end of the fuel intake pipe (3) is provided with a fuel gas intake connector (2), and the rear end of the fuel intake pipe (3) is connected to the fuel storage chamber (7), and the fuel in the fuel storage chamber (7) enters the primary convergence area (401) of the fuel mixture core through the fuel gas inlet (405); the exhaust gas storage chamber (8) is connected to the exhaust gas inlet arranged on the wall surface of the mixer body (1), and the exhaust gas in the exhaust gas storage chamber (8) flows into the exhaust gas mixture core convergence area (501) through the channel between the fuel mixture core smooth area (403) and the exhaust gas mixture core convergence area (501); The pressure sensor (6) is arranged on the wall surface of the mixer body (1), and the air intake channel of the pressure sensor (6) is connected to the air intake hole in the middle part of the fuel mixture core smooth area (403).

2. The mixer for a gas engine according to claim 1, characterized in that The cross-sectional areas of the internal cavities of the fuel mixture core primary convergence area (401), the fuel mixture core secondary convergence area (402), the fuel mixture core smoothing area (403), the exhaust gas mixture core convergence area (501), the exhaust gas mixture core smoothing area (502), and the exhaust gas mixture core diffusion area (503) are all circular.

3. The mixer for gas engines according to claim 2, characterized in that The fuel gas inlets (405) are arranged in an array on the wall surface of the primary convergence area (401) of the fuel mixture core.

4. The mixer for a gas engine according to claim 2, characterized in that The inlet cross-sectional area of ​​the primary convergence zone (401) of the fuel mixture core is equal to the outlet cross-sectional area of ​​the exhaust gas mixture core diffusion zone (503).

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