CN201068826Y - diesel and natural gas double fuel air mixer for diesel motor - Google Patents

Abstract

The utility model relates to a diesel and natural gas dual-fuel air mixer for a diesel engine, which can effectively solve the problems of increasing the vacuum degree of the suction port of the mixer and increasing the sensitivity of the mixer to the vacuum degree of the intake pipe. The structure is that the pipe body The two ends of the tapered pipe are respectively equipped with a nozzle body, the upper nozzle body is equipped with an inner pipe, and the inner pipe and the pipe body are equipped with an L-shaped natural gas inlet pipe. The natural gas inlet pipe extends out of the lower transitional tapered pipe. The natural gas inlet pipe is equipped with upper and lower disc bodies, and the lower part of the upper disc body and the upper part of the lower disc body are equipped with guide vanes. The utility model can effectively ensure the working performance of the diesel-natural gas dual fuel engine, and its structure is simple. The utility model has low manufacturing cost and good use effect, is a creative improvement to the existing air mixer, and has remarkable economic and social benefits.

Description

Diesel Natural Gas Dual Fuel Air Mixer for Diesel Engines

1. Technical field

The utility model relates to an air mixer, in particular to a diesel and natural gas dual-fuel air mixer for a diesel engine.

2. Background technology

At present, there are mainly two types of natural gas-air mixers for diesel engines in China: one is the negative pressure suction type, and the other is the positive pressure injection type.

The negative pressure suction mixer is mainly a Venturi mixer, which is a mixer made of the Venturi principle. It is generally composed of a shell and a core. Holes, natural gas inlet on the shell. On the one hand, this kind of mixer needs to generate vacuum at the throat to adjust the natural gas flow rate of the pressure reducing regulator, and on the other hand, it needs to mix natural gas and air evenly.

For the Venturi mixer with negative pressure suction type, although its structure is simple, but because the working speed of the diesel engine is relatively low, if the throat diameter of the mixer is too large, the vacuum degree at the throat diameter will be small, insensitive, and suction The intake of natural gas will be less, and the power of the engine will be low; if the throat diameter of the mixer is too small, the amount of air inhaled will be small, which will affect the air-fuel ratio, the fuel will not be completely combusted, the engine economy will be poor, and its power will also drop. The flow characteristics of the Venturi mixer are consistent with the characteristics required by the engine in the middle load condition, but it cannot adapt to the change of the mixture gas concentration in the starting, tire speed and full load conditions. These defects have seriously affected the performance of the diesel-CNG dual-fuel engine, and restricted the modification and promotion of the diesel-CNG dual-fuel engine.

The positive pressure injection type mixer mainly controls the supply of gaseous fuel by the electronic control unit through the electromagnetic injection valve or the stepper motor valve. The concentration of this mixed gas does not play a role in regulation, so its use is not satisfactory.

3. Contents of utility model

The main purpose of this utility model is to improve the vacuum degree of the suction port of the mixer, increase the sensitivity of the mixer to the vacuum degree of the intake pipe, and not only can absorb enough natural gas according to the load and speed of the engine, but also avoid causing the inhaled air If the amount is small, the engine power will be reduced.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows:

The utility model is composed of three parts: an outer cylinder, a guide vane and a natural gas pipe. There is an L-shaped natural gas inlet pipe, the natural gas inlet pipe protrudes from the lower transitional cone pipe, and the upper and lower disc bodies are installed outside the natural gas inlet pipe in the pipe body, and guide vanes are installed on the lower part of the upper disc body and the upper part of the lower disc body .

The utility model can mix natural gas into the pure air entering the cold cylinder of the engine. The amount of mixed natural gas is related to the vacuum degree of the cylinder. It can be sensitive to the vacuum degree in the engine cylinder and absorb a certain amount of natural gas in proportion. The load can inhale enough natural gas, and can also inhale the amount of air required for the normal operation of the engine, which can effectively ensure the working performance of the diesel-natural gas dual fuel engine. Its structure is simple, the cost is low, and the use effect is good. The creative improvement has remarkable economic and social benefits.

4. Description of drawings

Fig. 1 is a front view of the utility model;

Fig. 2 is the sectional view of A-A in Fig. 1 of the utility model;

Fig. 3 is a vertical center sectional view of the utility model;

Fig. 4 is a plan view of the upper disk body of the utility model;

Fig. 5 is a plan view of the lower disc body of the utility model;

Fig. 6 is a front view of the guide vane of the present invention;

Fig. 7 is a top view of the guide vane of the present invention.

5. Specific implementation

The specific embodiment of the utility model is described in detail below according to accompanying drawing:

As shown in Figures 1, 2 and 3, the utility model is composed of three parts: an outer cylinder, a guide vane and a natural gas pipe. The upper nozzle body is equipped with an inner pipe 2, an L-shaped natural gas inlet pipe 8 is installed in the inner pipe 2 and the pipe body 6, and the natural gas inlet pipe 8 protrudes from the lower excessive tapered pipe 9, and the natural gas inlet pipe 8 is installed outside the pipe body 6 There are an upper disc body 4 and a lower disc body 7, and the lower part of the upper disc body 4 and the upper part of the lower disc body 7 are equipped with guide vanes 5.

As can be seen from FIGS. 4 and 5 , the upper disc body 4 and the lower disc body 7 are provided with vent holes 10 .

It can be seen from Figures 6 and 7 that the guide vanes 5 are turbine-shaped, and generally 5-6 pieces are evenly distributed on the upper and lower disk bodies. The natural gas inlet pipe 8 penetrates from the radial direction of the outer cylinder and runs along the The axial direction is bent at an angle of 90°, which is L-shaped. The outlet is close to or flush with the end of the guide vane. The guide vane is in the shape of a turbine with the opening facing forward and the mouth closed behind.

The utility model is installed behind the air filter of the diesel engine and before the turbocharger when in use.

Claims (3)

1. used for diesel engine diesel gas double fuel air mixer, by urceolus, guide vane and natural gas tube three parts are formed, it is characterized in that body (6) two ends are through excessive Taper Pipe (3,9) mouth of pipe body (1) is housed respectively, interior pipe (2) is housed in the upper orifice body, reach rock gas suction tude (8) that the L type is housed in the body (6) in the interior pipe (2), rock gas suction tude (8) is stretched out the excessive Taper Pipe (9) of bottom, the outer disc (4) that is equipped with of the inherent rock gas suction tude of body (6) (8), lower disc body (7), last disc (4) bottom, guide vane (5) is equipped with on lower disc body (7) top.

2. according to claims 1 described used for diesel engine diesel gas double fuel air mixer, it is characterized in that described going up on disc (4) and the lower disc body (7) has air hole (10).

3. according to claims 1 described used for diesel engine diesel gas double fuel air mixer, it is characterized in that, described guide vane (5) is a turbine-like, there is the 5-6 sheet to be evenly distributed on the upper and lower disc, rock gas suction tude (8) from urceolus radially penetrate and at circle centre position along the crooked 90 ° of angles of axial direction, its outlet and the end of guide vane near or concordant, guide vane is opening forward, closing in after turbine-like.

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