Gas mixer and gas engine

Abstract

The utility model discloses a gas mixer and a gas engine. The gas mixer comprises a mixing chamber and a main gas chamber, an air inlet and a mixed gas outlet are respectively formed in two end parts of the mixing chamber and are communicated with the interior of the mixing chamber to form an air flow channel; the main gas chamber is annular and arranged on the periphery of the mixing chamber, a first partition plate is arranged between the inner walls of the two ends of the main gas chamber and used for dividing the main gas chamber into an outer chamber and an inner chamber which are arranged in the radial direction of the main gas chamber, and a plurality of first vent holes are evenly formed in the first partition plate in the circumferential direction and used for communicating the outer chamber with the inner chamber to form a main gas flow channel. The main gas inlet is formed in the outer cavity, the first partition plate is in a circular truncated cone shape, the small-diameter end of the first partition plate faces the mixed gas outlet, a first annular gap is reserved between the small-diameter end of the first partition plate and the side wall of the mixing cavity and serves as a main gas outlet of a main gas runner, and the main gas outlet communicates with the inner cavity and the mixing cavity. According to the invention, the mixing uniformity and the mixing speed of the gas and the air are improved, so that the performance requirement of the high-efficiency supercharger is met.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, and more specifically, to a gas mixer. In addition, the utility model also relates to a gas engine comprising the gas mixer. Background Art

[0002] The gas mixer is an important component in a gas engine. Its function is to ensure that the gas engine can obtain the right amount, right proportion, and evenly mixed air and fuel to achieve an efficient and clean combustion process, thereby improving the performance and economy of the gas engine and reducing emissions of pollutants.

[0003] The gas mixer has a mixing chamber, which is provided with an air inlet, a gas inlet and a mixed gas outlet connected to the front end of the supercharger. The air and gas enter the mixing chamber through the air inlet and the gas inlet respectively, and after being fully mixed, flow out of the mixed gas outlet and enter the supercharger. However, in the current gas mixer, the air and gas are not mixed evenly in its mixing chamber, so the quality of the mixed gas is uneven, which causes great polarization wear on the supercharger blades and cannot meet the performance requirements of a high-efficiency supercharger. In addition, the mixing speed of the air and gas in the mixing chamber is slow, which also cannot meet the performance requirements of a high-efficiency supercharger.

[0004] In summary, how to solve the problem that the current gas mixer cannot meet the performance requirements of a high-efficiency supercharger is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, an object of the present invention is to provide a gas mixer which can meet the performance requirements of a high-efficiency supercharger.

[0006] Another object of the utility model is to provide a gas engine comprising the gas mixer.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A gas mixer comprises a mixing chamber and a main gas chamber;

[0009] The mixing chamber has an air inlet and a mixed gas outlet at both ends thereof, which are connected to the interior of the mixing chamber to form an air flow channel;

[0010] The main gas chamber is annular and arranged at the outer periphery of the mixing chamber. A first partition is provided between the inner walls at both ends of the main gas chamber, which is used to separate the main gas chamber into an outer chamber and an inner chamber arranged along its radial direction. The first partition is evenly provided with a plurality of first air holes in the circumferential direction, which are used to connect the outer chamber and the inner chamber to form a main gas flow channel;

[0011] Among them, the main gas inlet of the main gas flow channel is arranged in the outer chamber, and the first partition is in a truncated cone shape, with its small diameter end arranged toward the mixed gas outlet and leaving a first annular gap between it and the side wall of the mixing chamber to serve as the main gas outlet of the main gas flow channel, and it connects the inner chamber and the mixing chamber.

[0012] Preferably, a plurality of the first air holes are arranged away from the main gas outlet.

[0013] Preferably, the outer chamber is provided with a bypass gas inlet, and the bypass gas inlet is communicated with the main gas flow channel.

[0014] Preferably, it further comprises a bypass gas chamber, which is annular and arranged on the outer periphery of the mixing chamber, a second partition is arranged between the annular walls on both sides of the bypass gas chamber, for dividing the bypass gas chamber into a front chamber and a rear chamber arranged along the axial direction thereof, and the second partition is evenly provided with a plurality of second air holes in the circumferential direction, for connecting the front chamber and the rear chamber to form a bypass gas flow channel;

[0015] The bypass gas inlet of the bypass gas flow channel is arranged in the front chamber, and the annular wall of the bypass gas chamber on one side close to the mixing chamber is in a truncated cone shape, with its small diameter end arranged toward the mixed gas outlet and a second annular gap is left between the side wall of the mixing chamber to serve as the bypass gas outlet of the bypass gas flow channel, and it connects the rear chamber and the mixing chamber.

[0016] Preferably, a plurality of the second air holes are arranged away from the bypass gas outlet.

[0017] Preferably, the main gas chamber and the bypass gas chamber are arranged in sequence along a direction from the air inlet to the mixed gas outlet.

[0018] Preferably, the main gas chamber and the bypass gas chamber are connected as one body.

[0019] A gas engine comprises the gas mixer described in any one of the above items.

[0020] Compared with the above-mentioned background technology, the gas mixer provided by the utility model comprises a mixing chamber and a main gas chamber, one end of the mixing chamber is provided with an air inlet for connecting to an air supply pipeline, the other end of the mixing chamber is provided with a mixed gas outlet for connecting to a supercharger, the interior of the mixing chamber is connected to the air inlet and the mixed gas outlet to form an air flow channel, the main gas chamber is arranged in a ring shape around the outer circumference of the mixing chamber, the truncated cone-shaped first partition is connected between the inner walls at both ends of the main gas chamber, and the main gas chamber is divided into an outer chamber and an inner chamber, the outer chamber is provided with a main gas inlet for connecting to a gas supply pipeline, the two are connected to form an air inlet end of the main gas flow channel, the first partition is connected to the mixing chamber side A first annular gap is left between the walls, which is the main gas outlet, and forms the gas outlet end of the main gas flow channel with the inner chamber. In this way, the gas in the gas supply pipeline can flow into the mixing chamber through the gas inlet end (main gas inlet and outer chamber) of the main gas flow channel and the gas outlet end (inner chamber and main gas outlet) of the main gas flow channel in sequence. Since a plurality of first air holes are evenly arranged around the circumference of the first partition plate, the gas in the outer chamber is more evenly diffused into the inner chamber. Since the inner chamber is connected to the mixing chamber, the gas is evenly diffused into the air flow channel and fully mixed with the air, thereby improving the uniformity of gas and air mixing and reducing polarization wear on the supercharger blades to meet the performance requirements of a high-efficiency supercharger.

[0021] In addition, the first partition is in a truncated cone shape, and its small diameter end is arranged toward the mixed gas outlet, so that the inner diameter of the inner chamber gradually decreases in the direction from the air inlet to the mixed gas outlet, so that the small diameter end of the inner chamber and the first annular gap form a narrow opening, and the narrow opening is connected to the mixing chamber, so that the gas flowing into the outlet end of the main gas flow channel forms a negative pressure at the narrow opening and quickly flows into the air flow channel, thereby reducing the flow resistance and increasing the speed of the gas flowing into the air flow channel, so as to improve the mixing speed of the gas and air. At the same time, the outlet end of the main gas flow channel is inclined at a certain angle to the air flow channel, which facilitates the gas in the outlet end of the main gas flow channel to flow into the air flow channel, further reducing the flow resistance and improving the mixing speed of the gas and air, thereby meeting the performance requirements of the high-efficiency supercharger. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of the gas mixer provided by the utility model;

[0024] Figure 2A schematic diagram of the internal structure of the gas mixer provided by the utility model;

[0025] Figure 3 This is a schematic diagram of the distribution of air flow channels, main gas flow channels and bypass gas flow channels in the gas mixer provided by the utility model.

[0026] In the figure:

[0027] 1 is the mixing chamber, 2 is the main gas chamber, and 3 is the bypass gas chamber;

[0028] 11 is an air inlet, 12 is a mixed gas outlet, and 13 is an air flow channel;

[0029] 21 is a main gas inlet, 22 is an outer chamber, 23 is an inner chamber, 24 is a first baffle, 25 is a first air hole, 26 is a main gas outlet, and 27 is a main gas flow channel;

[0030] 31 is the bypass gas inlet, 32 is the front chamber, 33 is the rear chamber, 34 is the second partition, 35 is the second air hole, 36 is the bypass gas outlet, and 37 is the bypass gas flow channel. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The core of the utility model is to provide a gas mixer, which can meet the performance requirements of a high-efficiency supercharger.

[0033] Another core of the utility model is to provide a gas engine including the gas mixer.

[0034] It should be noted that in the present embodiment, the directions or positional relationships indicated by “front”, “rear”, etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0035] Please refer to Figures 1 to 3 The present application provides a gas mixer, comprising a mixing chamber 1 and a main gas chamber 2 .

[0036] An air inlet 11 and a mixed gas outlet 12 are respectively disposed at two ends of the mixing chamber 1 , and the air inlet 11 and the mixed gas outlet 12 are connected to the interior of the mixing chamber 1 to form an air flow channel 13 .

[0037] The main gas chamber 2 is annular and is arranged on the outer periphery of the mixing chamber 1. A first partition plate 24 is provided between the inner walls at both ends of the main gas chamber 2, which is used to divide the main gas chamber 2 into an outer chamber 22 and an inner chamber 23 arranged along its radial direction. The first partition plate 24 is evenly provided with a plurality of first air holes 25 in the circumferential direction, which are used to connect the outer chamber 22 and the inner chamber 23 to form a main gas flow channel 27.

[0038] Among them, the main gas inlet 21 of the main gas flow channel 27 is arranged in the outer chamber 22, and the first partition plate 24 is in a truncated cone shape, with its small diameter end arranged toward the mixed gas outlet 12 and leaving a first annular gap between it and the side wall of the mixing chamber 1 to serve as the main gas outlet 26 of the main gas flow channel 27, and it connects the inner chamber 23 and the mixing chamber 1.

[0039] Specifically, an air inlet 11 is provided at the front end of the mixing chamber 1 for connecting to an air supply pipe, and a mixed gas outlet 12 is provided at the rear end of the mixing chamber 1 for connecting to a supercharger, and the air inlet 11 and the mixed gas outlet 12 are distributed along the axial direction of the mixing chamber 1 and are connected to form an air flow channel 13; the main gas chamber 2 is arranged in a ring shape around the outer circumference of the main shell, and the first partition plate 24 is in a truncated cone shape, and its large diameter end and small diameter end are respectively fixed to the front end inner wall and the rear end inner wall of the ring main gas chamber 2, and the outer wall of the first partition plate 24 and the front end wall, the rear end wall and the outer annular wall of the main gas chamber 2 form an outer chamber 22, and the inner wall of the first partition plate 24 and the front end wall, the rear end wall and the inner annular wall of the main gas chamber 2 An inner chamber 23 is formed therebetween. Since the first baffle 24 is in a truncated cone shape and the small diameter end of the first baffle 24 is arranged toward the mixed gas outlet 12, the inner chamber 23 is in a truncated cone shape and its small diameter end is arranged toward the mixed gas outlet 12. In addition, a first annular gap is left between the small diameter end of the first baffle 24 and the side wall of the mixing chamber 1, and the first annular gap connects the inner chamber 23 and the mixing chamber 1. Preferably, the inner annular wall of the main gas chamber 2 and the side wall of the mixing chamber 1 are an integral structure, so that a first annular gap is left between the small diameter end of the first baffle 24 and the inner annular wall of the main gas chamber 2, that is, the first annular gap and the small diameter end of the inner chamber 23 are integrated to form a narrow opening connected to the air flow channel 13.

[0040] In addition, a plurality of first air holes 25 are evenly arranged circumferentially on the first partition plate 24, so that the outer chamber 22 and the inner chamber 23 are connected to form a main gas flow channel 27, and a main gas inlet 21 for connecting to the gas supply pipeline is provided on the outer chamber 22, which forms the gas inlet end of the gas flow channel with the outer chamber 22, and the narrow opening at the small diameter end of the inner chamber 23 is used as the main gas outlet 26, which forms the gas outlet end of the gas flow channel with the inner chamber 23. It should be noted that, since the inner chamber 23 is a truncated cone structure arranged circumferentially around the mixing chamber 1 and its small diameter end faces the mixed gas outlet 12, and the air flow channel 13 is arranged circumferentially along the mixing chamber 1, the gas outlet end of the gas flow channel is arranged at a certain inclination angle with the air flow channel 13 toward the mixed gas outlet 12, and the inclination angle is preferably 15°, and can also be set to other angles according to actual operating conditions, and is not unique.

[0041] The gas mixer with the above structure is arranged evenly around the circumference of the first partition plate 24 because the plurality of first air holes 25 are evenly arranged, so that the gas flowing into the inlet end of the gas flow channel is evenly diffused to the outlet end of the gas flow channel, and evenly flows into the air flow channel 13 to be fully mixed with the air, thereby improving the uniformity of gas and air mixing, reducing the polarization wear of the supercharger blades, and meeting the performance requirements of the high-efficiency supercharger. In addition, since there is a narrow opening at the connection between the outlet end of the gas flow channel and the air flow channel 13, the gas flowing into the outlet end of the main gas flow channel 27 forms a negative pressure at the narrow opening and quickly flows into the air flow channel 13, increasing the speed of the gas flowing into the air flow channel 13, reducing the flow resistance, and improving the mixing speed of the gas and air. Moreover, since the outlet end of the gas flow channel is arranged at a certain inclination angle with the air flow channel 13, it is convenient for the gas in the outlet end of the main gas flow channel 27 to flow into the air flow channel 13, further reducing the flow resistance, and improving the mixing speed of the gas and air, thereby meeting the performance requirements of the high-efficiency supercharger.

[0042] Based on the above examples, please refer to Figure 2 , a plurality of first air holes 25 are arranged away from the main gas outlet 26. Specifically, a plurality of first air holes 25 are arranged around the circumference of the first partition plate 24 at the large diameter end of the first partition plate 24 to be away from the main gas outlet 26 of the gas flow channel, that is, away from the narrow opening at the small diameter end of the inner chamber 23, so as to ensure that the gas has a sufficiently long movement path in the gas flow channel, ensure that the gas is more fully diffused, and make the gas and air mix more fully.

[0043] It should be noted that the mixed gas outlet 12 of the mixer is connected to a supercharger, which uses the energy of the exhaust gas to compress the intake air, increase the intake air volume, and send the high-density mixed gas into the combustion chamber of the gas engine for combustion to increase the output power of the engine. If the engine power drops suddenly, too much mixed gas in the intake pipe between the supercharger and the combustion chamber of the gas engine will cause the supercharger to surge.

[0044] In order to reduce the risk of supercharger surge, on the basis of the above embodiment, the outer chamber 22 is provided with a bypass gas inlet 31 , which is communicated with the main gas flow channel 27 .

[0045] Specifically, a bypass gas inlet 31 is also provided on the outer chamber 22, which is connected to the intake pipe between the supercharger and the combustion chamber of the gas engine through a bypass pipe. In this way, the mixed gas in the intake pipe is reintroduced into the mixer at the front end of the supercharger, and flows into the supercharger together with the mixed gas formed by the main gas and air in the mixer. The supercharger is then used to readjust the intake amount flowing into the engine to adapt to the engine power, thereby reducing the risk of supercharger surge and ensuring that the engine runs more smoothly and reliably.

[0046] In order to reduce the risk of supercharger surge and ensure the uniformity of air and gas mixing in the mixer, based on the above embodiment, please refer to Figures 1 to 3 The present application also includes a bypass gas chamber 3, which is annular and arranged on the outer periphery of the mixing chamber 1. A second partition 34 is provided between the annular walls on both sides of the bypass gas chamber 3, which is used to separate the bypass gas chamber 3 into a front chamber 32 and a rear chamber 33 arranged along its axial direction, and the second partition 34 is evenly provided with a plurality of second air holes 35 in the circumferential direction, which are used to connect the front chamber 32 and the rear chamber 33 to form a bypass gas flow channel 37.

[0047] Among them, the bypass gas inlet 31 of the bypass gas flow channel 37 is arranged in the front chamber 32, and the annular wall of the bypass gas chamber 3 on one side close to the mixing chamber 1 is in a truncated cone shape, and its small diameter end is arranged toward the mixed gas outlet 12 and a second annular gap is left between the side wall of the mixing chamber 1 to serve as the bypass gas outlet 36 of the bypass gas flow channel 37, and it connects the rear chamber 33 and the mixing chamber 1.

[0048] Specifically, the bypass gas chamber 3 is arranged in a ring shape around the mixing chamber 1, and a second partition plate 34 is arranged around the axial direction between the outer annular wall and the inner annular wall of the bypass gas chamber 3 to divide the bypass gas chamber 3 into a front chamber 32 and a rear chamber 33, and the two are distributed along the axial direction of the bypass gas chamber 3, and the front chamber 32 is provided with a bypass gas inlet 31 for connecting the intake pipe between the supercharger and the combustion chamber of the gas engine, and a plurality of second air holes 35 are evenly arranged circumferentially on the second partition plate 34, so that the front chamber 32 is connected with the rear chamber 33, and the inner annular wall of the bypass gas chamber 3 is truncated cone-shaped, and its small diameter end is arranged toward the mixed gas outlet 12 and extends into the mixing chamber 1, leaving a second annular gap between the inner wall of the mixing chamber 1, so that the bypass gas inlet 31, the front chamber 32, the rear chamber 33 and the second annular gap are the bypass gas outlet 36 to form a bypass gas flow channel 37. In the above structure, since the diameter of the truncated cone-shaped inner annular wall gradually decreases from its large diameter end to its small diameter end, the bypass gas flow channel 37 and the air flow channel 13 are arranged at a certain inclination angle toward the mixed gas outlet 12. The inclination angle is preferably 15°, and can also be set to other angles according to actual operating conditions. It is not unique.

[0049] The bypass gas chamber 3 of the above structure has a plurality of second air holes 35 evenly arranged around the circumference of the second baffle 34, so that the gas flowing into the mixer in the front chamber 32 is evenly diffused into the rear chamber 33, and then fully and evenly diffused into the air flow channel 13 through the second annular gap to be fully mixed in the mixed gas formed by the gas and air in the air flow channel 13. The bypass gas chamber 3 and the main gas chamber 2 are two independent complementary interference chambers, which can prevent the excess mixed gas in the intake pipe from interfering with the gas flow and mixing of the main gas flow channel 27 and the air flow channel 13, so as to ensure the uniformity of the mixing of the gas and air. The mixed gas formed after mixing is then mixed with the mixed gas flowing out of the bypass gas flow channel 37 and flows into the supercharger together, so as to achieve the purpose of reducing the risk of supercharger surge. In addition, the bypass gas flow channel 37 and the air flow channel 13 are arranged at a certain inclination angle toward the mixture outlet 12, so that the mixture in the bypass gas flow channel 37 can flow into the air flow channel 13 quickly, reduce the flow resistance, and make the mixture outflow speed of the bypass gas flow channel 37 match the gas and air mixing speed in the air flow channel 13, thereby meeting the performance requirements of the high-efficiency supercharger.

[0050] Based on the above examples, please refer to Figure 2 , a plurality of second air holes 35 are arranged away from the bypass gas outlet 36. Specifically, a plurality of second air holes 35 are arranged around the large diameter end of the inner annular wall of the bypass gas chamber 3, so as to be away from the bypass gas outlet 36 of the bypass gas flow channel 37, thereby ensuring that the mixed gas has a sufficiently long movement path in the bypass gas flow channel 37, ensuring that the mixed gas is more fully diffused.

[0051] Based on the above examples, please refer to Figure 3 The main gas chamber 2 and the bypass gas chamber 3 are arranged in sequence along the direction from the air inlet 11 to the mixed gas outlet 12, so that the gas flowing out of the main gas flow channel 27 can be fully mixed with the air flowing in from the air inlet 11 first, and the mixed gas formed after mixing is then mixed with the mixed gas flowing out of the bypass gas flow channel 37 and flows out from the mixed gas outlet 12 to the supercharger, so as to effectively prevent the excess mixed gas in the intake pipe from interfering with the flow and mixing of the main gas flow channel 27 and the air flow channel 13.

[0052] Based on the above examples, please refer to Figure 2 , the main gas chamber 2 and the bypass gas chamber 3 are connected as one. Specifically, the rear end wall of the main gas chamber 2 and the front end wall of the bypass gas chamber 3 are an integral structure to form an annular partition to isolate the two chambers. In addition, the inner annular wall of the main gas chamber 2 and the inner annular wall of the bypass gas chamber 3 are an integral structure to form a truncated cone-shaped partition, and the annular partition is circumferentially arranged around the truncated cone-shaped partition. It should be noted that a plurality of iron sheets arranged at intervals in the circumferential direction are welded between the truncated cone-shaped partition and the side wall of the mixing chamber 1, and at the positions corresponding to the first annular gap and the second annular gap, thereby forming two independent annular gaps, which are connected to the air flow channel 13.

[0053] In addition to the above-mentioned gas mixer, the present invention also provides a gas engine including the gas mixer disclosed in the above-mentioned embodiment. For the structures of other parts of the gas engine, please refer to the prior art and will not be described in detail herein.

[0054] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0055] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0056] The above is a detailed introduction to a gas mixer and a gas engine provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A gas mixer, characterized in that: It comprises a mixing chamber (1) and a main gas chamber (2); The mixing chamber (1) has an air inlet (11) and a mixed gas outlet (12) at both ends thereof, which are connected to the interior of the mixing chamber (1) to form an air flow channel (13); The main gas chamber (2) is annular and is arranged on the outer periphery of the mixing chamber (1); a first partition (24) is arranged between the inner walls at both ends of the main gas chamber (2) for dividing the main gas chamber (2) into an outer chamber (22) and an inner chamber (23) arranged along the radial direction thereof; the first partition (24) is evenly provided with a plurality of first air holes (25) in the circumferential direction for connecting the outer chamber (22) and the inner chamber (23) to form a main gas flow channel (27); The main gas inlet (21) of the main gas flow channel (27) is arranged in the outer chamber (22); the first partition plate (24) is in the shape of a truncated cone, with its small diameter end arranged toward the mixed gas outlet (12) and a first annular gap left between it and the side wall of the mixing chamber (1) to serve as the main gas outlet (26) of the main gas flow channel (27), and the first partition plate (24) connects the inner chamber (23) and the mixing chamber (1).

2. The gas mixer according to claim 1, characterized in that: A plurality of the first air holes (25) are arranged away from the main gas outlet (26).

3. The gas mixer according to claim 2, characterized in that: The outer chamber (22) is provided with a bypass gas inlet (31), which is communicated with the main gas flow channel (27).

4. The gas mixer according to claim 2, characterized in that: The invention also comprises a bypass gas chamber (3) which is annular and arranged on the outer periphery of the mixing chamber (1); a second partition plate (34) is arranged between the annular walls on both sides of the bypass gas chamber (3) for dividing the bypass gas chamber (3) into a front chamber (32) and a rear chamber (33) arranged along the axial direction thereof; and the second partition plate (34) is evenly provided with a plurality of second air holes (35) in the circumferential direction for connecting the front chamber (32) and the rear chamber (33) to form a bypass gas flow channel (37); The bypass gas inlet (31) of the bypass gas flow channel (37) is arranged in the front chamber (32), and the annular wall of the bypass gas chamber (3) on one side close to the mixing chamber (1) is in a truncated cone shape, with its small diameter end arranged toward the mixed gas outlet (12) and a second annular gap is left between the side wall of the mixing chamber (1) to serve as the bypass gas outlet (36) of the bypass gas flow channel (37), and the bypass gas outlet (36) is connected to the rear chamber (33) and the mixing chamber (1).

5. The gas mixer according to claim 4, characterized in that: A plurality of the second air holes (35) are arranged away from the bypass gas outlet (36).

6. The gas mixer according to claim 5, characterized in that: The main gas chamber (2) and the bypass gas chamber (3) are arranged in sequence along the direction from the air inlet (11) to the mixed gas outlet (12).

7. The gas mixer according to claim 6, characterized in that: The main gas chamber (2) and the bypass gas chamber (3) are connected as one body.

8. A gas engine, characterized in that: The gas engine comprises the gas mixer according to any one of claims 1 to 7.

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