CN115164236A - Heat insulation assembly suitable for oil thrower disc combustion chamber - Google Patents

Abstract

The invention discloses a heat insulation assembly suitable for a combustion chamber of an oil thrower, which relates to the technical field of combustion chambers of oil throwers and comprises the following components: the combustor comprises a combustion chamber and a diffuser, wherein an annular cavity is formed between the combustion chamber and the diffuser; the annular cavity is internally provided with the heat shield, the bottom end of the heat shield is connected with the diffuser, an airflow channel is formed between the heat shield and the combustion chamber, and airflow flows to the inlet of the combustion chamber from top to bottom through the airflow channel.

Description

A thermal insulation assembly suitable for oil slinger combustion chamber

technical field

The invention relates to the technical field of an oil slinger combustion chamber, in particular to a heat insulation assembly suitable for an oil slinger combustion chamber.

Background technique

The oil throwing disc type combustion chamber is widely used in micro and small engines, and the micro and small engines have a high rotational speed. Between 4W-10W revolutions, the centrifugal force generated by this rotational speed can greatly improve the atomization effect of fuel. The high temperature gas increases the heat radiation of the combustion chamber to the surrounding parts, among which the compressor parts are the most affected.

The existing design of unobstructed heat radiation between the outer ring of the oil throwing pan combustion chamber and the compressor diffuser causes the combustion chamber to radiate a large amount of heat to the compressor components, increasing the temperature of the compressor and decreasing the efficiency. At the same time, the increase of the temperature of the diffuser will lead to the deterioration of the rigidity of the parts and the increase of the deformation, which will bring risks such as increased thermal deformation of the parts and changes in the compressor clearance, which may further lead to a decrease in efficiency.

For the problems in the related technologies, no effective solutions have been proposed so far.

SUMMARY OF THE INVENTION

In view of the problems in the related art, the present invention proposes a heat insulation assembly suitable for the combustion chamber of the oil slinger. By directly arranging the heat shield on the combustion chamber and the diffuser, the heat radiation from the combustion chamber to the diffuser can be effectively reduced , reduce the temperature of the diffuser and improve the efficiency of the compressor, so as to overcome the above-mentioned technical problems existing in the related art.

The technical scheme of the present invention is realized as follows:

A heat insulation assembly suitable for an oil slinger combustion chamber, comprising: a combustion chamber and a diffuser, an annular cavity is formed between the combustion chamber and the diffuser;

The annular cavity is provided with a heat shield, the bottom end of the heat shield is connected to the diffuser, and an airflow channel is formed between the heat shield and the combustion chamber, and the airflow passes from top to bottom The airflow runner flows toward the combustion chamber inlet.

Further, the heat shield is located between the combustion chamber and the diffuser, and the bottom end of the heat shield is fixedly connected to the diffuser through bolts.

Further, the material of the heat shield is S304 stainless steel or S310 stainless steel.

Further, the heat shield has a curved structure.

Further, the surface roughness of the heat shield is greater than 3.2 mm.

Further, the thickness of the heat shield is 1mm˜3mm.

Beneficial effects of the present invention:

1. The present invention is suitable for the heat insulation assembly of the oil throwing pan combustion chamber. By directly setting the heat shield in the combustion chamber and the diffuser, the heat radiation from the combustion chamber to the diffuser can be effectively reduced, the temperature of the diffuser can be reduced, and the temperature of the diffuser can be increased. Compressor efficiency.

2. The present invention is suitable for the heat insulation assembly of the oil throwing pan combustion chamber. The air flow flows into the annular cavity and forms an air flow channel through the heat shield to flow from top to bottom to the entrance of the combustion chamber, which plays the role of diversion, and the curved surface structure The heat shield makes the annular cavity flow channel narrow, and the flow velocity of the airflow through the airflow flow channel increases, which increases the jet depth of the airflow at the inlet of the combustion chamber, thereby improving the cooling effect.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a thermal insulation assembly suitable for an oil slinger combustion chamber according to an embodiment of the present invention;

In the picture:

1. Heat shield; 2. Combustion chamber; 3. Diffuser; 4. Ring cavity; 5. Air flow channel.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present invention.

According to an embodiment of the present invention, a thermal insulation assembly suitable for use in a slinger combustion chamber is provided.

As shown in FIG. 1 , the thermal insulation assembly suitable for the combustion chamber of the oil slinger according to the embodiment of the present invention includes: a combustion chamber 2 and a diffuser 3, and an annular cavity 4 is formed between the combustion chamber 2 and the diffuser 3;

The annular cavity 4 is provided with a heat shield 1, the bottom end of the heat shield 1 is connected to the diffuser 3, and an air flow channel 5 is formed between the heat shield 1 and the combustion chamber 2, and the air flow passes through the air flow channel from top to bottom 5 flows to the inlet of combustion chamber 2.

With the help of the above technical solution, by directly installing the heat shield 1 in the combustion chamber 2 and the diffuser 3, the heat radiation from the combustion chamber 2 to the diffuser 3 can be effectively reduced, the temperature of the diffuser 3 can be lowered, and the compressor efficiency can be improved.

In addition, the heat shield 1 is located between the combustion chamber 2 and the diffuser 3, and the bottom end of the heat shield 1 is fixedly connected to the diffuser 3 through bolts.

In this technical solution, an air flow from the combustion chamber of the oil throwing pan is folded back 180° from the compressor outlet and flows downward into the annular cavity 4 between the combustion chamber 2 and the diffuser 3. Due to the addition of the heat shield 1, the annular cavity 4 causes the heat shield 1 to be added. An air flow can only flow into the inlet of the combustion chamber 2 from the air flow channel 5 between the heat shield 1 and the combustion chamber 2, which acts as a guide.

In addition, in this technical solution, the material of the heat shield 1 is S304 stainless steel or S310 stainless steel; the heat shield 1 is a curved surface structure; the surface roughness of the heat shield 1 is greater than 3.2 mm; and the thickness of the heat shield 1 is 1 mm to 3 mm.

Specifically, due to the addition of the heat shield 1 through the annular cavity 4, the air flow flows into the inlet of the combustion chamber 2 through the air flow channel 5 between the heat shield 1 and the combustion chamber 2, and the heat shield 1 makes a flow channel of the air flow. Narrowing, the gas flow rate increases, and the jet depth of the airflow at the front end of the combustion chamber 2 is increased, thereby improving its cooling effect.

In addition, the gas flow loss is effectively reduced through CFD (Computational Fluid Dynamics, Computational Fluid Dynamics) calculation through the heat shield 1 with a curved structure. In addition, the air inlet of the heat shield 1 is rounded to reduce the flow loss.

To sum up, with the aid of the above-mentioned technical solutions of the present invention, the following effects can be achieved:

1. The present invention is suitable for the heat insulation assembly of the combustion chamber of the oil slinger. By directly setting the heat shield 1 in the combustion chamber 2 and the diffuser 3, the heat radiation from the combustion chamber 2 to the diffuser 3 can be effectively reduced, and the diffusion Compressor 3 temperature, improve compressor efficiency.

2. The present invention is suitable for the heat insulation assembly of the oil throwing pan combustion chamber. The air flow flows into the annular cavity 4 and forms an air flow channel 5 through the heat shield 1, which flows from top to bottom to the entrance of the combustion chamber 2, which plays a role of diversion, and The heat shield 1 with the curved surface structure narrows the flow passage of the annular cavity 4, and the flow velocity of the airflow through the airflow passage 5 increases, which increases the jet depth of the airflow at the inlet of the combustion chamber 2, thereby improving the cooling effect.

3. The present invention is suitable for the heat insulation assembly of the oil throwing pan combustion chamber, and the heat shield 1 reduces the gas flow loss through structural design.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Those skilled in the art will easily think of other embodiments of the present disclosure after considering the disclosure in the description and the examples. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or techniques in the technical field not disclosed by the present disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the disclosure being indicated by the claims.

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (6)

1. A thermal insulation assembly suitable for an oil slinger combustion chamber, characterized in that it comprises: a combustion chamber (2) and a diffuser (3), the combustion chamber (2) and the diffuser (3) ) to form a ring cavity (4); The annular cavity (4) is provided with a heat shield (1), the bottom end of the heat shield (1) is connected to the diffuser (3), and the heat shield (1) is connected to the diffuser (3). An airflow channel (5) is formed between the combustion chambers (2), and the airflow flows from top to bottom through the airflow channel (5) to the inlet of the combustion chamber (2). 2 . The heat insulation assembly suitable for the oil slinger combustion chamber according to claim 1 , wherein the bottom end of the heat shield ( 1 ) is fixedly connected to the diffuser ( 3 ) through bolts. 3 . 3 . The heat insulation assembly suitable for the oil slinger combustion chamber according to claim 2 , wherein the material of the heat shield ( 1 ) is S304 stainless steel or S310 stainless steel. 4 . 4 . The heat insulation assembly suitable for the combustion chamber of the oil slinger according to claim 3 , wherein the heat shield ( 1 ) is a curved surface structure. 5 . 5. The heat insulating assembly suitable for the oil slinger combustion chamber according to claim 4, wherein the surface roughness of the heat shield (1) is greater than 3.2 mm. 6 . The heat insulating assembly suitable for the combustion chamber of the oil slinger according to claim 5 , wherein the thickness of the heat shield ( 1 ) is 1 mm˜3 mm. 7 .

Images