阅读说明：本技术 一种燃烧室结构及液体火箭发动机 (Combustion chamber structure and liquid rocket engine ) 是由 杨瑞康 宣智超 韩建业 于 2021-09-15 设计创作，主要内容包括：本发明公开了一种异种金属的燃烧室结构及燃烧室,包含两端相通且内部设有流道的燃烧室外壁及燃烧室内壁和用于固定燃烧室外壁与燃烧室内壁的连接部。连接部在燃烧室内壁和燃烧室外壁之间形成位于燃烧室内壁和燃烧室外壁之间的凸肋。燃烧室外壁位于燃烧室内壁的外侧,且沿燃烧室外壁周向内表面均匀设有多个第一开槽,沿燃烧室内壁周向外表面设有分别与多个第一开槽匹配设置的多个第二开槽。连接部沿燃烧室外壁径向方向的两端分别与第一开槽和所述第二开槽内壁贴紧以使所述燃烧室外壁与所述燃烧室内壁连接。在所述燃烧室内壁和所述燃烧室外壁之间,相邻的所述连接部之间形成供液体和/或气体介质流通的冷却通道。该结构具有设计合理,便于操作。(The invention discloses a combustion chamber structure and a combustion chamber of dissimilar metals, which comprise a combustion chamber outer wall, a combustion chamber inner wall and a connecting part, wherein the two ends of the combustion chamber outer wall are communicated, a flow channel is arranged in the combustion chamber outer wall, and the connecting part is used for fixing the combustion chamber outer wall and the combustion chamber inner wall. The connecting part forms a convex rib between the inner wall of the combustion chamber and the outer wall of the combustion chamber. The outer wall of the combustion chamber is located on the outer side of the inner wall of the combustion chamber, a plurality of first grooves are uniformly formed in the circumferential inner surface of the outer wall of the combustion chamber, and a plurality of second grooves which are matched with the first grooves are formed in the circumferential outer surface of the inner wall of the combustion chamber. Two ends of the connecting part along the radial direction of the outer wall of the combustion chamber are respectively attached to the inner walls of the first open groove and the second open groove so that the outer wall of the combustion chamber is connected with the inner wall of the combustion chamber. And a cooling channel for circulating liquid and/or gas media is formed between the inner wall of the combustion chamber and the outer wall of the combustion chamber and between the adjacent connecting parts. The structure has reasonable design and is convenient to operate.)

1. A combustion chamber structure is characterized by comprising a combustion chamber outer wall, a combustion chamber inner wall and a connecting part, wherein the two ends of the combustion chamber outer wall are communicated, a flow channel is arranged in the combustion chamber outer wall, the connecting part is used for fixing the combustion chamber outer wall and the combustion chamber inner wall, a convex rib positioned between the combustion chamber inner wall and the combustion chamber outer wall is formed between the combustion chamber inner wall and the combustion chamber outer wall by the connecting part, wherein,

the outer wall of the combustion chamber is positioned on the outer side of the inner wall of the combustion chamber, a plurality of first grooves are uniformly formed in the circumferential inner surface of the outer wall of the combustion chamber, and the first grooves extend along the length direction of the outer wall of the combustion chamber; a plurality of second grooves which are respectively matched with the first grooves are formed in the circumferential outer surface of the inner wall of the combustion chamber, and the second grooves extend along the length direction of the inner wall of the combustion chamber; two ends of the connecting part along the radial direction of the outer wall of the combustion chamber are respectively attached to the inner walls of the first open groove and the second open groove so as to connect the outer wall of the combustion chamber with the inner wall of the combustion chamber; and a cooling channel for circulating liquid and/or gas media is formed between the inner wall of the combustion chamber and the outer wall of the combustion chamber and between the adjacent connecting parts.

2. The combustor structure of claim 1, wherein the combustor outer wall comprises an outer cylinder and an outer cone which are integrally formed, a large end of the outer cone is connected with one end of the outer cylinder, and a small end of the outer cone is located on a side far away from the outer cylinder; the combustor inner wall contains the interior barrel and the interior toper portion of integrated into one piece design, the big tip of interior toper with interior barrel one end is connected, just the little tip of interior toper is located keeps away from interior barrel one side.

3. The combustor structure of claim 2, wherein the transition point of the outer barrel and the outer cone is a first camber structure.

4. The combustion chamber structure according to claim 2, wherein the first open groove includes a first inner groove body provided along the outer cylinder body in the axial direction and a first inner groove portion provided along the outer cone generatrix, and the first inner groove body and the first inner groove portion communicate with each other.

5. The combustion chamber structure as claimed in claim 4, wherein the first inner groove is shaped like a T, and one end of the connecting portion along the radial direction of the outer cylinder is closely attached to the inner surface of the T.

6. The combustor structure of claim 5, wherein the transition point of the inner barrel and the inner cone is a second curved arc structure; the second fluting contains along the outer cell body of second that interior barrel axial set up and along the outer cell body of second that interior pyramis generating line set up, the outer cell body of second with the outer cell body of second communicates each other.

7. The combustion chamber structure as claimed in claim 6, wherein the second outer groove is shaped like a second T, and the other end of the connecting portion along the radial direction of the outer cylinder is closely attached to the inner surface of the second T.

8. The combustor structure of claim 2, wherein the connecting portion comprises a first elongated rib mating the inner barrel and the outer barrel portion, a circular rib mating the inner barrel and the inner cone portion and the transition point of the outer barrel and the outer cone portion, and a second elongated rib mating the inner cone portion and the outer cone portion.

9. The combustion chamber structure according to claim 1, wherein said connecting portions at both ends of said combustion chamber outer wall are fixed to said combustion chamber outer wall by welding.

10. A liquid rocket engine prepared using the dissimilar metal combustion chamber structure of any one of claims 1-9.

Technical Field

The invention relates to the field of liquid rockets, in particular to a combustion chamber structure and a liquid rocket engine.

Background

The technology of spacecraft engines is rapidly upgraded with the development of the aerospace industry. As the main parts of the engine, the combustion chamber and the heat exchanger of the liquid rocket engine are the key parts for completing the energy conversion of the propellant and generating the thrust action. The combustion chamber and the heat exchanger are respectively composed of an inner wall and an outer wall, and the inner wall and the outer wall with grooves are generally connected to bear pressure and circulate media through the grooves.

When the inner wall is connected with the outer wall, in order to take heat conduction, strength, weight and other factors into consideration, the inner wall is usually in a copper-outer wall structure design of steel, titanium and other materials in the design of the combustion chamber, so as to meet the requirements of heat protection, strength increase, weight reduction and the like. The traditional processing mode is that convex ribs are processed on the outer side of the inner wall, and the inner wall is connected with the outer wall in a brazing and diffusion welding mode. Because the copper and the titanium can be severely corroded by the burner at high temperature and the weldability of certain titanium alloys (such as TA15, TC4 and the like) is poor, the difficulty of welding the inner wall and the outer wall is increased, and the production efficiency of the combustion chamber is influenced.

Therefore, how to provide a combustion chamber structure of dissimilar metal has reasonable in design, the operation of being convenient for, and stable in structure can improve production efficiency, is the problem that will solve at present.

Disclosure of Invention

The invention aims to provide a combustion chamber structure and a combustion chamber, which have the advantages of reasonable design, convenience in operation, stable structure, capability of improving the production efficiency and the like.

In order to achieve the purpose, the invention provides the following technical scheme:

a combustion chamber structure comprises a combustion chamber outer wall and a combustion chamber inner wall which are communicated with each other at two ends and internally provided with a flow passage, and a connecting part used for fixing the combustion chamber outer wall and the combustion chamber inner wall, wherein a convex rib positioned between the combustion chamber inner wall and the combustion chamber outer wall is formed between the combustion chamber inner wall and the combustion chamber outer wall by the connecting part,

the outer wall of the combustion chamber is positioned on the outer side of the inner wall of the combustion chamber, a plurality of first grooves are uniformly formed in the circumferential inner surface of the outer wall of the combustion chamber, a plurality of second grooves which are matched with the first grooves are formed in the circumferential outer surface of the inner wall of the combustion chamber, and two ends of the connecting part in the radial direction of the outer wall of the combustion chamber are tightly attached to the inner walls of the first grooves and the second grooves respectively so that the outer wall of the combustion chamber is connected with the inner wall of the combustion chamber; and a cooling channel for circulating liquid and/or gas media is formed between the inner wall of the combustion chamber and the outer wall of the combustion chamber and between the adjacent connecting parts.

Furthermore, the outer wall of the combustion chamber comprises an outer cylinder body and an outer cone part which are integrally formed, the large end part of the outer cone part is connected with one end of the outer cylinder body, and the small end part of the outer cone part is positioned on one side far away from the outer cylinder body; the combustor inner wall contains the interior barrel and the interior toper portion of integrated into one piece design, the big tip of interior toper with interior barrel one end is connected, just the little tip of interior toper is located keeps away from interior barrel one side.

Further, the transition part of the outer cylinder and the outer cone is of a first arc bending structure.

Further, first fluting contains along the first interior cell body that outer barrel axial set up and along the first interior cell part that the external cone generatrix set up, first interior cell body with first interior cell part communicates each other.

Furthermore, follow outer barrel radial direction intercepts, the appearance of first interior cell body is first T style of calligraphy structure, just connecting portion follow outer barrel radial direction's one end with first T style of calligraphy structure internal surface is hugged closely.

Furthermore, the transition part of the inner cylinder body and the inner cone part is of a second arc bending structure; the second fluting contains along the outer cell body of second that interior barrel axial set up and along the outer cell body of second that interior pyramis generating line set up, the outer cell body of second with the outer cell body of second communicates each other.

Furthermore, the outer groove body of the second is of a second T-shaped structure, and the other end of the connecting part in the radial direction of the outer cylinder body is tightly attached to the inner surface of the second T-shaped structure.

Further, the connecting portion comprises a first long rib matching the inner cylinder and the outer cylinder, a circular rib matching the transition positions of the inner cylinder and the inner cone and the transition positions of the outer cylinder and the outer cone, and a second long rib matching the inner cone and the outer cone.

Furthermore, the connecting parts at two ends of the outer wall of the combustion chamber are fixed with the outer wall of the combustion chamber through welding.

The invention also provides a liquid rocket engine which is prepared by adopting the combustion chamber structure of any one of the dissimilar metals.

Compared with the prior art, the embodiment of the invention has the beneficial effects of at least one of the following:

(1) the combustion chamber structure of the dissimilar metal comprises a combustion chamber outer wall, a combustion chamber inner wall and a connecting part, wherein two ends of the connecting part along the radial direction of the combustion chamber outer wall are respectively attached to the first open groove inner wall and the second open groove inner wall so that the combustion chamber outer wall is connected with the combustion chamber inner wall. Whole connection process can reduce the welding to reduce because of the welding a large amount of heats that produce make the insecure shortcoming of combustor outer wall and combustor inner wall connection, and then make and connect inseparabler between combustor outer wall and the combustor inner wall, fixed more firm, whole stable in structure.

(2) Because the two ends of the connecting part are respectively attached to the inner walls of the first open groove and the second open groove to connect the outer wall of the combustion chamber with the inner wall of the combustion chamber, the connection part is convenient to mount and dismount, and the outer wall of the combustion chamber and the inner wall of the combustion chamber are ensured to be intact and can be reused. When the outer wall of the combustion chamber and the inner wall of the combustion chamber need to be repaired independently, the connecting part can be detached, so that the outer wall of the combustion chamber and the inner wall of the combustion chamber are separated, the outer wall of the combustion chamber and the inner wall of the combustion chamber can be repaired accurately, the outer wall of the combustion chamber and the inner wall of the combustion chamber can be reused, and the effect of saving cost is achieved.

(3) Through evenly being equipped with a plurality of first flutings and being equipped with a plurality of second flutings that match the setting with a plurality of first flutings respectively along combustion chamber inner wall circumference surface along combustion chamber outer wall circumference, the atress when a plurality of first flutings and a plurality of second flutings circumference set up and make the junction be connected combustion chamber outer wall and combustion chamber inner wall is more even, and then prevent that deformation from taking place because of the atress inequality for combustion chamber outer wall and combustion chamber inner wall, thereby be favorable to the combustion chamber safe handling.

(4) The connecting part forms the convex rib between the inner wall of the combustion chamber and the outer wall of the combustion chamber, the cooling channel is formed between the adjacent convex ribs, so that liquid and/or gas media can circulate conveniently, stable and uniform output of the liquid and/or gas media is ensured, and heat on the surface of the combustion chamber can be taken away after the low-temperature liquid and/or gas media pass through the cooling channel, and normal application of the combustion chamber is ensured.

The whole device has the advantages of reasonable design, convenient operation, capability of improving the production efficiency and the like.

Drawings

FIG. 1 is a perspective view of a combustion chamber of the present invention;

FIG. 2 is a schematic view of the connection between the outer wall of the combustion chamber, the inner wall of the combustion chamber and the connecting part;

FIG. 3 is a schematic view of the first elongated rib, the circular rib and the second elongated rib according to the present invention;

FIG. 4 is a schematic view of the structure of the outer wall of the combustion chamber, the inner wall of the combustion chamber and the connection part of the invention by welding;

FIG. 5 is a perspective view of the inner wall of the combustion chamber of the present invention;

FIG. 6 is a perspective view of the outer wall of the combustion chamber of the present invention.

Description of reference numerals:

1 outer wall of combustion chamber 2 inner wall of combustion chamber

3 connecting part 4 first slot

5 second slot 6 outer cylinder

7 external cone part 8 internal cylinder body

9 internal taper 10 first elongate rib

11 circular ribs 12 second elongated ribs

Detailed Description

For the purpose of promoting a clear understanding of the objects, aspects and advantages of the embodiments of the invention, reference will now be made to the drawings and detailed description, wherein there are shown in the drawings and described in detail, various modifications of the embodiments described herein, and other embodiments of the invention will be apparent to those skilled in the art.

The exemplary embodiments of the present invention and the description thereof are provided to explain the present invention and not to limit the present invention. Additionally, the same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.

As used herein, the terms "first," "second," …, etc., do not denote any order or sequence, nor are they used to limit the present invention, but rather are used to distinguish one element from another or from another element or operation described in the same technical language.

With respect to directional terminology used herein, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology used is intended to be illustrative and is not intended to be limiting of the present teachings.

As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.

As used herein, "and/or" includes any and all combinations of the described items.

As used herein, the terms "substantially", "about" and the like are used to modify any slight variation in quantity or error that does not alter the nature of the variation. Generally, the range of slight variations or errors modified by such terms may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. It should be understood by those skilled in the art that the aforementioned values can be adjusted according to actual needs, and are not limited thereto.

Certain words used to describe the present application are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present application.

Embodiments of the present invention provide a combustion chamber structure. Referring to fig. 1, 2, 3, 4, 5 and 6, the combustion chamber structure of dissimilar metals includes a combustion chamber outer wall 1 and a combustion chamber inner wall 2 having two ends communicated with each other and a flow passage formed therein, and a connection part 3 for fixing the combustion chamber outer wall 1 and the combustion chamber inner wall 2. The connecting portion 3 forms a rib between the combustion chamber inner wall 1 and the combustion chamber outer wall 2. The outer wall 1 of combustion chamber is located the outside of combustion chamber inner wall 2, and evenly is equipped with a plurality of first flutings 4 along 1 circumference internal surface of outer wall of combustion chamber, along 2 circumference surfaces of inner wall of combustion chamber be equipped with respectively with a plurality of second flutings 5 that a plurality of first flutings 4 match the setting, connecting portion 3 along 1 radial direction's of outer wall of combustion chamber both ends respectively with first fluting 4 and the 5 inner walls of second fluting paste tightly so that outer wall 1 of combustion chamber is connected with inner wall 2 of combustion chamber. Between the combustion chamber inner wall 2 and the combustion chamber outer wall 1, between adjacent connections 3, cooling channels are formed through which a liquid and/or gaseous medium flows.

In the present embodiment, the combustion chamber outer wall 1 includes the outer cylinder 6 and the outer cone 7 which are integrally formed, the large end of the outer cone 7 is connected to one end of the outer cylinder 6, and the small end of the outer cone 7 is positioned on the side away from the outer cylinder 6. The inner wall 2 of the combustion chamber comprises an inner cylinder 8 and an inner cone 9 which are integrally formed, the large end part of the inner cone 9 is connected with one end of the inner cylinder 8, and the small end part of the inner cone 9 is positioned at one side of the inner cylinder 8 far away.

Referring to fig. 1, 2, 5 and 6, in order to facilitate the circulation of the liquid and/or gas medium, the impact pressure of the liquid and/or gas medium on the transition portion of the outer cylinder 6 and the outer cone 7 is reduced, for example, the transition portion of the outer cylinder 6 and the outer cone 7 is a first curved structure, the contact area of the liquid and/or gas medium can be increased by the design of the first curved structure, so as to reduce the pressure on the surface of the first curved structure, so as to prevent the transition portion from deforming, and further facilitate the circulation of the liquid and/or gas medium. In order to cooperate with the first curved structure to ensure smooth circulation of the liquid and/or gas medium, for example, the transition part of the inner cylinder body and the inner cone part is designed as the second curved structure, and the liquid and/or gas medium is circulated from the gap between the first curved structure and the second curved structure.

In addition, in order to facilitate the installation of the connecting body 3, for example, the first slot 4 comprises a first inner slot body arranged along the axial direction of the outer cylinder 6 and a first inner slot body arranged along the generatrix of the outer cone 7, and the first inner slot body are communicated with each other; the second fluting 5 contains along the outer cell body of the second of 8 axial settings of interior barrel and the outer cell body of the second that sets up along the 9 generating lines of interior toper portion, the outer cell body of second and the outer cell body of second intercommunication each other.

In the present embodiment, in order to fix the connecting body 3 conveniently, the connecting body 3 is connected to the first open slot 4 and the second open slot 5, for example, the connecting body is intersected along the radial direction of the outer cylinder 6, the outer shape of the first inner slot body is a first T-shaped structure, and one end of the connecting body 3 along the radial direction of the outer cylinder 6 is closely attached to the inner surface of the first T-shaped structure; the outer groove body is of a second T-shaped structure along the radial direction of the inner cylinder body 8, and the other end of the connecting part along the radial direction of the outer cylinder body 6 is tightly attached to the inner surface of the second T-shaped structure.

It should be further noted that, referring to fig. 1, 2, 3, 4, 5 and 6, for the convenience of installing the connecting portion, for example, the connecting portion 3 includes a first elongated rib 10 (the shape of both ends matches with the first inner groove and the first outer groove, for example, the shape of both ends matches with the first T-shaped structure and the second T-shaped structure, i.e. the cross section of the first elongated rib is i-shaped), a circular rib 11 matching with the inner cylinder 8 and the inner cone 9, and the transition portion of the outer cylinder 6 and the outer cone 7 (since the transition portion is a curved arc structure, for example, both ends of the circular rib along the radial direction of the outer wall of the combustion chamber are a plurality of matching cylinders arranged in sequence, and a plurality of supporting cylinders integrally formed with and arranged in sequence are included between both ends of the matching cylinders, the diameter of the supporting cylinders is smaller than that of both ends, and the matching cylinders at the two ends are respectively attached to the inner surfaces of the first slot and the second slot, and the matching cylinders at the two ends can respectively and freely move in the first slot and the second slot) and a second long rib matching the inner cone part 9 with the outer cone 7. Further, for convenience of use, for example, the second elongated rib may be designed to have the same shape as the first elongated rib.

It should be noted that, in actual use, in order to ensure that the connection portion 3 between the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber is firmly fixed and avoid the connection portion from being separated, for example, the connection portions 3 at the two ends of the outer wall 1 of the combustion chamber and the outer wall 1 of the combustion chamber are fixed by welding. In order to reduce the influence on the outer wall 1 of the combustion chamber during welding (the outer wall 1 of the combustion chamber is deformed by the high temperature generated during welding), for example, the connection portion 3 may be welded to the outer wall 1 of the combustion chamber by laser welding, i.e., by a laser beam along the circumferential outer surface of the outer wall of the combustion chamber. Because the connecting parts 3 at the two ends of the outer wall 1 of the combustion chamber are welded with the outer wall 1 of the combustion chamber, the connecting parts 3 between the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber are prevented from falling off (the connecting parts at the two ends are equivalent to a door and are welded and fixed, and the parts of the connecting parts inside can be prevented from falling off). For further fixing the connection portions, for example, the connection portions 3 at both ends of the combustion chamber inner wall 2 and the combustion chamber inner wall 2 may be fixed by laser welding.

The invention also provides a combustion chamber which is prepared by adopting the combustion chamber structure of any one of the dissimilar metals.

The invention also provides a liquid rocket engine which is prepared by adopting the combustion chamber structure of any one of the dissimilar metals.

Specifically, the combustion chamber structure of the dissimilar metal comprises a combustion chamber outer wall 1, a combustion chamber inner wall 2 and a connecting part 3, wherein two ends of the connecting part 3 along the radial direction of the combustion chamber outer wall 1 are respectively attached to the inner walls of a first open groove 4 and a second open groove 5 so that the combustion chamber outer wall 1 is connected with the combustion chamber inner wall 2. Whole connection process can reduce the welding to reduce and make the shortcoming of combustor outer wall 1 and combustor inner wall 2 insecure connection because of a large amount of heats that the welding produced, and then make and connect inseparabler between combustor outer wall 1 and the combustor inner wall 2, it is fixed more firm, whole structure is more stable. When the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber are connected, the surface chemical and electrochemical treatment steps are reduced without performing surface treatment on the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber.

In addition, because the two ends of the connecting part 3 are respectively attached to the inner walls of the first open groove 4 and the second open groove 5 to connect the outer wall 1 of the combustion chamber with the inner wall 2 of the combustion chamber, the connection part 3 can be conveniently mounted and dismounted, and the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber can be ensured to be intact and can be reused. When the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber need to be repaired independently (when the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber are ablated, the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber can be replaced), the connecting part 3 can be detached, and then the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber are separated, so that the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber can be repaired accurately, the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber can be reused, and the cost is saved.

In addition, through evenly being equipped with a plurality of first flutings 4 and being equipped with a plurality of second flutings 5 that match the setting respectively with a plurality of first flutings 4 along 1 circumference internal surface of combustion chamber outer wall and along 2 circumference surfaces of combustion chamber inner wall, the atress when a plurality of first flutings 4 and 5 circumference of a plurality of second flutings make connecting portion 3 be connected combustion chamber outer wall 1 with combustion chamber inner wall 2 is more even, and then prevent that deformation from taking place because of the atress inequality for 1 and 2 of combustion chamber outer walls, thereby be favorable to the combustion chamber safe handling.

Connecting portion 3 forms the fin that is located between combustor inner wall 2 and combustor outer wall 1, forms cooling channel between the adjacent fin, not only can be convenient for liquid and/or gaseous medium circulation, guarantees that liquid and/or gaseous medium are stable, even output, and low temperature liquid and/or gaseous medium pass through cooling channel after, can take away the heat on combustor surface, avoids the combustor to be ablated by high temperature.

In addition, the design reduces the thermal process of methods such as diffusion welding, brazing and the like, and avoids the performance reduction of the inner wall material due to high temperature, for example, the performance reduction of the copper material after high temperature. In addition, the design can also realize the interlayer structure link of the inner wall and the outer wall of various alloys, particularly for materials which are difficult to weld in the traditional modes of copper, titanium, niobium tungsten and the like. It should be particularly reminded that when the inner wall and the outer wall are connected, the link strength of the interlayer between the inner wall and the outer wall is the base material strength of the rib (connecting part), so that by adopting the welding method of the design, even if the inner wall is made of a material with weaker strength, the link strength can be improved by selecting a material with a higher strength rib, and the selection range of the material of the combustion chamber is further expanded.

The whole device has the advantages of reasonable design, convenient operation, strong structural stability, capability of improving the production efficiency and the like.

The foregoing is merely an illustrative embodiment of the present invention, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principle of the present invention should fall within the protection scope of the present invention.