阅读说明：本技术 一种进气混合室 (Air inlet mixing chamber ) 是由 赵磊 胡佳富 郭心刚 于 2020-04-08 设计创作，主要内容包括：本发明提供一种进气混合室,包括带有混合腔的混合室主体,混合室主体上设有分别与混合腔连通的中冷空气进口、EGR废气进口、燃气进口和混合气体出口。其中,靠近EGR废气进口的位置设有水冷系统。本发明提供的进气混合室,使空气、废气、燃气在同一处进行混合,能够增加混合室的温度,使废气中的水气冷凝成液态水后很难冻结成固态冰,从而解决了天然气发动机怠速状态下进气系统结冰的问题,既达到了使液态水保持液态的效果又使整个进气混合室轻量化。(The invention provides an air inlet mixing chamber which comprises a mixing chamber main body with a mixing cavity, wherein an intercooling air inlet, an EGR waste gas inlet, a fuel gas inlet and a mixed gas outlet which are respectively communicated with the mixing cavity are formed in the mixing chamber main body. Wherein, the position close to the EGR waste gas inlet is provided with a water cooling system. The air inlet mixing chamber provided by the invention can mix air, waste gas and fuel gas at the same position, can increase the temperature of the mixing chamber, and can make water vapor in the waste gas difficult to freeze into solid ice after being condensed into liquid water, thereby solving the problem that an air inlet system is frozen when a natural gas engine is in an idle state, and achieving the effect of keeping the liquid water in the liquid state and lightening the whole air inlet mixing chamber.)

1. The air inlet mixing chamber is characterized by comprising a mixing chamber main body with a mixing cavity, wherein an intercooling air inlet, an EGR waste gas inlet, a fuel gas inlet and a mixed gas outlet which are respectively communicated with the mixing cavity are formed in the mixing chamber main body; wherein the content of the first and second substances,

and a water cooling system is arranged at a position close to the EGR waste gas inlet.

2. The intake mixing chamber of claim 1, wherein the mixing chamber body is provided with a water inlet device and a water return device; wherein the content of the first and second substances,

the water inlet device is respectively connected with the water cooling system and the cylinder cover water jacket;

and the water return device is respectively connected with the water cooling system and a water return pipeline of the air compressor.

3. The intake mixing chamber of claim 2, wherein the water intake device and the water return device each comprise a connector and a hose connected to the connector.

4. The intake mixing chamber of claim 3, wherein the hose has an internal diameter of 4 to 5 mm.

5. The intake mixing chamber of any one of claims 1-4, wherein the water cooling system includes a water jacket wrapped around the EGR exhaust gas inlet.

6. The intake mixing chamber of claim 5, wherein the water jacket is disposed in a semi-wrapped state.

7. The intake mixing chamber of claim 5, wherein the water jacket has a thickness of 9 to 11 mm.

8. The intake mixing chamber of any one of claims 1-4, wherein the mixing chamber body is of tubular construction.

9. The intake mixing chamber of any one of claims 1-4, wherein a throttle mounting flange is provided at the intercooled air inlet.

10. An intake mixing chamber as claimed in any one of claims 1 to 4, wherein a Mixer mounting flange is provided at the gas inlet.

Technical Field

The invention relates to the technical field of natural gas engines with EGR (exhaust gas recirculation) systems, in particular to an air inlet mixing chamber.

Background

The air inlet mixing chamber is an important part in an air inlet system of a natural gas engine and is a place where three kinds of gas, namely intercooled pure air, EGR waste gas and fuel gas are mixed. The gas temperature of EGR waste gas after passing through an EGR cooler can also reach about 140 ℃, the waste gas contains more than 20% of water vapor as well known, in cold winter, the high-temperature waste gas meets cold air, the water vapor in the waste gas can be rapidly condensed into liquid water, the ambient temperature is low, the liquid water is rapidly frozen into solid ice, thereby blocking an air inlet pipeline, increasing the air inlet resistance of an engine, influencing the performance of the engine, and completely blocking an air inlet channel under more serious conditions to ensure that the engine cannot ignite.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an air inlet mixing chamber, which can increase the temperature of the mixing chamber, so that water vapor in waste gas is condensed into liquid water which is difficult to freeze into solid ice, and the liquid water enters an air cylinder along with the mixed gas and is discharged into the atmosphere.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

an air inlet mixing chamber comprises a mixing chamber main body with a mixing cavity, wherein an intercooling air inlet, an EGR waste gas inlet, a fuel gas inlet and a mixed gas outlet which are respectively communicated with the mixing cavity are formed in the mixing chamber main body. Wherein, the position close to the EGR waste gas inlet is provided with a water cooling system.

According to the air inlet mixing chamber, a highly integrated design form is adopted, the intercooling air inlet, the EGR waste gas inlet, the fuel gas inlet and the mixed gas outlet are integrated on the mixing chamber main body, and after the engine is started, intercooling pure air, EGR waste gas and fuel gas meet in a mixing cavity of the mixing chamber at the same time, so that the aim of mixing is really achieved. The water cooling system is arranged at the position where EGR waste gas enters, after the waste gas in the EGR meets cold air, the waste gas is condensed into liquid water, the water cooling system contains cooling water, the temperature of the cooling water is usually over 85 ℃, the high-temperature cooling water enables the position near an EGR waste gas inlet to be kept at a certain temperature which is certainly greater than 0 ℃, the liquid water condensed in the mixing chamber is always kept in a liquid state and is difficult to freeze into solid ice, the pressure of the mixed combustible gas is 300KPa, the liquid water enters the cylinder along with the combustible gas, and the liquid water is discharged to the atmosphere along with the waste gas after combustion, so that the problem of icing of the gas inlet system in the idling state of the natural gas engine can be effectively solved, and further, the engine is prevented from being out of work, such as flameout and pneumatic failure. The whole air inlet mixing chamber is not provided with a water cooling system in all places, and the cooling system is only arranged near the EGR waste gas inlet, so that the effect of keeping liquid water in a liquid state is achieved, and the whole air inlet mixing chamber is light.

With respect to the above technical solution, further improvements as described below can be made.

According to the air inlet mixing chamber, in a preferred embodiment, the mixing chamber body is provided with a water inlet device and a water return device. Wherein, water installations is connected with water cooling system and cylinder cap water jacket respectively. The water return device is respectively connected with the water cooling system and the air compressor water return pipeline.

The water inlet device is communicated with the water jacket of the cylinder cover, cooling water in the cylinder cover can reach the water cooling system on the mixing chamber through the hose, and after the water cooling system on the mixing chamber is filled with the cooling water, the cooling water returns to the water tank together with the cooling water of the air compressor through the water return device, so that the effective circulation of the water cooling system is realized on the premise of not influencing the whole engine cooling system.

In particular, in a preferred embodiment, the water inlet device and the water return device each comprise a plug and a hose connected with the plug.

The device with the structure can ensure that the whole device is extremely simple and convenient to mount and dismount, has lower cost, and is favorable for further lightening the whole air inlet mixing chamber.

Specifically, in a preferred embodiment, the inner diameter of the hose is 4 to 5 mm.

Such a hose within the inner diameter has a relatively small water flow and thus has very little effect on the water circulation system of the entire engine.

Specifically, in a preferred embodiment, the water cooling system includes a water jacket wrapped around the EGR exhaust inlet.

The water cooling system in the water jacket form is convenient to arrange, simple in structure, low in cost and beneficial to light weight of the whole mixing chamber.

Further, in a preferred embodiment, the water jacket is arranged in a half-wrapped state.

The water jacket with the structure enables the installation and the disassembly to be simple and convenient.

Specifically, in a preferred embodiment, the thickness of the water jacket is 9-11 mm.

The water jacket with the thickness dimension can not only effectively ensure that the temperature near the EGR waste gas inlet is kept to be more than 0 ℃, but also lighten the water cooling system as much as possible.

Specifically, in a preferred embodiment, the mixing chamber body is a tubular structure.

The mixing chamber main body with the structure has the advantages of simple structure, convenience in processing and low production cost.

Specifically, in a preferred embodiment, a throttle mounting flange is provided at the intercooled air inlet.

Specifically, in a preferred embodiment, a mounting flange is provided at the EGR exhaust gas inlet.

In particular, in a preferred embodiment, a Mixer mounting flange is provided at the gas inlet.

Compared with the prior art, the invention has the advantages that: the reasonable integration device is adopted, air, waste gas and gas are mixed at the same position, the temperature of the mixing chamber can be increased, water vapor in the waste gas is condensed into liquid water and then is difficult to freeze into solid ice, the liquid water can enter the cylinder along with the mixed gas and is discharged into the atmosphere, the problems that an air inlet system is frozen and the freezing directly causes the engine to break down under the idling state of the natural gas engine are solved, and the problem that the engine is failed to start is solved. And a reasonable cooling water circulation system is adopted, so that the circulation of cooling water in the cooling system is realized on the premise of not influencing the whole engine cooling system.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

FIG. 1 schematically shows a cross-sectional structure of an intake air mixing chamber of an embodiment of the invention;

fig. 2 schematically shows the overall structure of a water jacket of an embodiment of the invention;

FIG. 3 schematically illustrates a perspective view of an intake mixing chamber according to an embodiment of the invention;

fig. 4 schematically shows a perspective structure of another direction of the intake mixing chamber according to the embodiment of the present invention.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.

Fig. 1 schematically shows a sectional structure of an intake mixing chamber 10 of an embodiment of the present invention. Fig. 2 schematically shows the overall structure of the water jacket of the embodiment of the invention. Fig. 3 schematically shows a three-dimensional structure of the intake mixing chamber 10 of the embodiment of the present invention. Fig. 4 schematically shows a three-dimensional structure of the intake mixing chamber 10 according to another direction of the embodiment of the present invention.

As shown in fig. 1, 3 and 4, an intake mixing chamber 10 according to an embodiment of the present invention includes a mixing chamber body 1 having a mixing chamber 11, and the mixing chamber body 1 is provided with an intercooling air inlet 12, an EGR exhaust gas inlet 13, a fuel gas inlet 14 and a mixed gas outlet 15, which are respectively communicated with the mixing chamber 11. Wherein, a water cooling system 2 is arranged at a position close to the EGR waste gas inlet 13.

According to the air inlet mixing chamber disclosed by the embodiment of the invention, a highly integrated design form is adopted, the intercooling air inlet, the EGR waste gas inlet, the fuel gas inlet and the mixed gas outlet are integrated on the mixing chamber main body, and after the engine is started, intercooling pure air, EGR waste gas and fuel gas meet in the mixing cavity of the mixing chamber at the same time, so that the aim of mixing is really achieved. The water cooling system is arranged at the position where EGR waste gas enters, after the waste gas in the EGR meets cold air, the waste gas is condensed into liquid water, the water cooling system contains cooling water, the temperature of the cooling water is usually over 85 ℃, the high-temperature cooling water enables the position near an EGR waste gas inlet to be kept at a certain temperature which is certainly greater than 0 ℃, the liquid water condensed in the mixing chamber is always kept in a liquid state and is difficult to freeze into solid ice, the pressure of the mixed combustible gas is 300KPa, the liquid water enters the cylinder along with the combustible gas, and the liquid water is discharged to the atmosphere along with the waste gas after combustion, so that the problem of icing of the gas inlet system in the idling state of the natural gas engine can be effectively solved, and further, the engine is prevented from being out of work, such as flameout and pneumatic failure. The whole air inlet mixing chamber is not provided with a water cooling system in all places, and the cooling system is only arranged near the EGR waste gas inlet, so that the effect of keeping liquid water in a liquid state is achieved, and the whole air inlet mixing chamber is light.

Specifically, in the present embodiment, as shown in fig. 1, the mixing chamber body 1 is a tubular structure. The mixing chamber main body with the structure has the advantages of simple structure, convenience in processing and low production cost. Specifically, in the present embodiment, a throttle mounting flange is provided at the intercooling air inlet 12, a mounting flange is provided at the EGR exhaust gas inlet 13, and a Mixer mounting flange is provided at the gas inlet 14.

As shown in fig. 3 and 4, in the intake mixing chamber 10 according to the embodiment of the present invention, a water inlet device 3 and a water return device 4 are further provided on the mixing chamber body 1. Wherein, the water inlet device 3 is respectively connected with the water cooling system 2 and the cylinder cover water jacket. The water return device 4 is respectively connected with the water cooling system 2 and the air compressor water return pipeline. The water inlet device is communicated with the water jacket of the cylinder cover, cooling water in the cylinder cover can reach the water cooling system on the mixing chamber through the hose, and after the water cooling system on the mixing chamber is filled with the cooling water, the cooling water returns to the water tank together with the cooling water of the air compressor through the water return device, so that the effective circulation of the water cooling system is realized on the premise of not influencing the whole engine cooling system.

Specifically, in the present embodiment, the water cooling system 2 includes a water jacket 21, and the water jacket 21 is wrapped at a position near the EGR exhaust gas inlet 13. The water cooling system in the water jacket form is convenient to arrange, simple in structure, low in cost and beneficial to light weight of the whole mixing chamber. Further, in the present embodiment, the water jacket 21 is arranged in a half-wrapped state. The water jacket with the structure enables the installation and the disassembly to be simple and convenient. Specifically, in the present embodiment, the thickness of the water jacket 21 is 9 to 11mm, and particularly preferably 10 mm. The water jacket with the thickness dimension can not only effectively ensure that the temperature near the EGR waste gas inlet is kept to be more than 0 ℃, but also lighten the water cooling system as much as possible.

Specifically, in the present embodiment, the water inlet device 3 and the water return device 4 each include a connector and a hose connected to the connector. The device with the structure can ensure that the whole device is extremely simple and convenient to mount and dismount, has lower cost, and is favorable for further lightening the whole air inlet mixing chamber. Preferably, in the embodiment, the inner diameter of the hose is 4-5 mm, and especially preferably 4.5 mm. Such a hose within the inner diameter has a relatively small water flow and thus has very little effect on the water circulation system of the entire engine.

According to the embodiment, the air inlet mixing chamber provided by the invention can mix air, waste gas and fuel gas at the same position, the temperature of the mixing chamber can be increased, and water vapor in the waste gas is condensed into liquid water and then is difficult to freeze into solid ice, so that the problem that an air inlet system is frozen in an idling state of a natural gas engine is solved, and the effect of keeping the liquid water in a liquid state is achieved, and the whole air inlet mixing chamber is light.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.