阅读说明：本技术 一种用于转子发动机的悬臂式径向密封装置 (Cantilever type radial sealing device for rotary engine ) 是由 纪常伟 杨振宇 杨金鑫 汪硕峰 黄雄辉 于 2021-07-21 设计创作，主要内容包括：一种用于转子发动机的悬臂式径向密封装置属于转子发动机领域。本发明的悬臂式径向密封装置包括悬臂结构、滚针以及连接用的圆柱销。本发明的悬臂式径向密封装置,抛弃传统径向密封片与单片弹簧的组合结构,不存在传统径向密封片的窜动与振拍的问题,改善了密封组件的运行状况。同时通过设置滚针将传统径向密封片与气缸缸体之间的滑动摩擦变为滚动摩擦,改善了摩擦性能,减小密封装置的磨损。本发明的悬臂式径向密封装置可以提高转子发动机密封性能,改善发动机摩擦状况,提高发动机的效率与使用寿命。(A cantilever type radial sealing device for a rotary engine belongs to the field of rotary engines. The cantilever type radial sealing device comprises a cantilever structure, a roller pin and a cylindrical pin for connection. The cantilever type radial sealing device abandons the combined structure of the traditional radial sealing sheet and the single-sheet spring, does not have the problems of play and vibration of the traditional radial sealing sheet, and improves the operation condition of the sealing assembly. Meanwhile, sliding friction between the traditional radial sealing sheet and the cylinder body of the air cylinder is changed into rolling friction through the arranged roller pins, so that the friction performance is improved, and the abrasion of the sealing device is reduced. The cantilever type radial sealing device can improve the sealing performance of the rotor engine, improve the friction condition of the engine, improve the efficiency of the engine and prolong the service life of the engine.)

1. A cantilevered radial seal assembly for a rotary engine, said cantilevered radial seal assembly comprising:

the cantilever structure is positioned at the top end of the rotor, one end of the cantilever structure is connected with the rotor, and the other end of the cantilever structure is used for arranging a roller pin;

and the needle roller is positioned in a mounting groove at the top end of the cantilever structure, can roll in the mounting groove and is used for contacting with a rotary engine cylinder block.

The cantilever structure is as follows:

the cantilever structure is generated by cutting the middle part of the offset curve of the two rotor molded lines on the rotor;

the top end of the cantilever structure is provided with a cylindrical hole for inserting a cylindrical pin;

the dimensions of the cantilever structure are selected as follows: the width b of the cantilever structure is the same as the width of the rotor; the length L of the cantilever structure is 1/2-2/3 of the distance from the top of the rotor to the pit, and L is 1/2-2/3L; the thickness s of the cantilever structure is selected to meet the condition of mechanical strength of the material:in the formula, σ_maxThe maximum gas pressure borne by the rotor is unit MPa; [ sigma ]]The maximum bending strength of the cantilever structure material is in MPa; selecting a minimum s according to the intensity condition; the opening height of the groove at the bottom of the cantilever structure is selected to be h 1-3 mm;

the needle groove has been seted up at cantilever structure top: the length x of the needle groove is 1-3 mm smaller than the width b of the cantilever structure; the radius R of two circular surfaces of the needle roller groove is slightly smaller than half of the thickness s of the cantilever structure, and R is 1/2s- (0.1-1) mm; the distance y between the circle center O of the circular surface of the needle groove and the top of the rotor is calculated as follows: and y is s/2-f, wherein f is the precompression of the cantilever structure, and the precompression f is calculated as follows:in the formula, σ_maxThe maximum gas pressure borne by the rotor is unit MPa; e is the elastic modulus of the cantilever structure material, and the unit is MPa.

2. A cantilevered radial seal arrangement for a rotary engine as claimed in claim 1 wherein:

the length and the radius of the needle roller are the same as those of the needle roller groove; a through cylindrical hole is formed in the needle roller, and the diameter of the through cylindrical hole is the same as that of the cylindrical hole formed in the top of the cantilever structure and used for inserting the cylindrical pin.

3. A cantilevered radial seal arrangement for a rotary engine as claimed in claim 1 wherein:

and the cylindrical pin and the connecting part are inserted into the cylindrical holes of the cantilever structure and the roller pin to fix the roller pin on the cantilever structure.

4. A cantilevered radial seal arrangement for a rotary engine as claimed in claim 1 wherein:

the rotary engine is a triangular rotary engine, and the cantilever type radial sealing devices are positioned at the three top ends of the triangular rotary engine.

Technical Field

The invention designs a cantilever type radial sealing device for a rotary engine, and belongs to the technical field of rotary engines.

Background

In order to keep good sealing performance of a traditional rotor engine, radial sealing pieces are mounted at three top corners of a rotor, and single springs in a pre-tightening state are arranged at the bottoms of the radial sealing pieces. The traditional radial sealing piece has the problems of play, vibration, air leakage and abrasion due to the structural problem of the traditional radial sealing piece. The structure of the radial sealing piece needs to be improved, and the sealing performance is improved.

The traditional radial sealing piece is arranged in a groove at the top of the rotor, a gap exists between the traditional radial sealing piece and the groove, and air leakage exists at the gap. Meanwhile, the traditional radial sealing sheet can generate play in the mounting groove under the action of gas pressure, so that the gas pressure at the bottom generates pulsation, the radial resultant force borne by the radial sealing sheet is greatly changed, the vibration beating phenomenon is caused, the sealing performance of the rotary engine is greatly reduced, and the working performance and the service life of the engine are seriously influenced.

The spring force provided by the spring of the conventional radial sealing piece is not enough to overcome the top gas pressure during combustion, and the radial sealing piece mainly depends on the bottom gas pressure to provide the main radial resultant force, so that the improvement of the spring structure is needed.

Sliding friction exists between the traditional radial sealing piece and the cylinder, the friction coefficient is large, and abrasion is serious. The friction coefficient of sliding friction is greater than the rolling friction coefficient, if become sliding friction for rolling friction, can reduce the wearing and tearing between radial gasket and cylinder, improves radial gasket's sealing performance and life.

Disclosure of Invention

The invention aims to provide a cantilever type radial sealing device for a rotary engine, which can improve the sealing performance of the rotary engine, improve the friction condition between the rotary engine and a cylinder, reduce the friction power loss of the rotary engine, improve the working performance and prolong the service life.

In order to achieve the purpose of the invention, the following technical scheme is adopted in the disclosure:

according to one aspect of the present disclosure, there is provided a rotary engine radial seal device comprising:

the cantilever type radial sealing device is formed in a cantilever type structure by slotting on three top end attachments of a rotor along an offset curve of a rotor profile.

A cylindrical groove is formed in the top of the cantilever structure, and a cylindrical roller pin is placed in the groove.

In an exemplary embodiment of the present disclosure, the needle roller and the cantilever structure are connected by a cylindrical pin.

In an exemplary embodiment of the disclosure, the cantilever structure is provided with a cylindrical groove, and the length and the diameter of the groove are the same as those of the needle roller.

In an exemplary embodiment of the present disclosure, the cantilever structure is made of the same metal material as the rotor.

In an exemplary embodiment of the present disclosure, the roller pins are made of wear-resistant metal or coated with a wear-resistant coating on the outer surface.

According to the radial sealing device of the rotary engine, the cantilever type sealing structure is adopted, the combination mode of the traditional radial sealing sheet and the sheet spring is omitted, and the radial sealing device is simplified. The problem of drunkenness, shake of traditional radial gasket has been avoided clapping.

According to the radial sealing device of the rotary engine, the needle roller is mounted at the top end of the cantilever type structure, the friction mode between the radial sealing device and the cylinder is changed from sliding friction to rolling friction, the friction condition is improved, and the friction loss is reduced.

The radial sealing device of the rotary engine in the disclosed embodiment can improve the sealing performance of the sealing assembly, avoids the problems of serious drunkenness, vibration and abrasion of the traditional radial sealing sheet, and improves the working performance and service life of the engine.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

FIG. 1 is a schematic view of a rotary engine in which: the engine comprises an engine cylinder body 1, an eccentric shaft 2, a rotor 3 and a radial sealing sheet 4 a;

fig. 2 is a schematic view of a conventional radial sealing device for a rotary engine, in which: the rotor 3, a radial sealing piece 4a, a single piece spring 4b and a sealing piece mounting groove 5;

fig. 3 is a rotor with cantilevered radial seals, wherein: the rotor 3, the cantilever structure 6 and the roller pin 7;

fig. 4 is a schematic view of a cantilevered radial seal configuration, wherein: the device comprises a rotor 3, a cantilever structure 6, a roller pin 7 and a cylindrical pin 8;

fig. 5 is a schematic view of the bottom groove of the cantilever type radial sealing structure, wherein: 3a is a rotor profile, and 6a and 6b are edge curves of a bottom groove;

FIG. 6 is a schematic view of the installation of the cantilevered radial seal assembly, wherein: rotor 3, cantilever structure 6, kingpin 7, cylindric lock 8, kingpin mounting groove 9.

FIG. 7 is a schematic diagram of the design dimensions of a cantilever structure, in which: cantilever length L, cantilever width b, cantilever thickness s, cantilever bottom groove set height h, pit 10 on the rotor, distance L from the top of the rotor to the pit.

Fig. 8 shows the design dimensions of the needle roller groove, wherein: the width x of the needle roller groove, the radius R of the circular surface of the needle roller groove, the center O of the circular surface of the needle roller groove, the length y from the center of the circular surface of the needle roller groove to the top point of the rotor and the radius R of the cylindrical pin hole.

Detailed Description

The following further illustrates embodiments of the invention in conjunction with the drawings:

to maintain the sealing performance between the rotor 3 and the cylinder block 1, the conventional rotary engine is provided with three radial sealing pieces 4a at three top ends of the rotor 3, and a single spring 4b at the bottom of the radial sealing pieces, wherein the top of the radial sealing pieces is kept in contact with the cylinder profile by the elasticity provided by the spring.

The cantilevered radial seal of the present invention is described with reference to fig. 3 and 4. grooves are formed in three tips of the rotor 3 to form three cantilevered structures 6 on the three tips of the rotor, and needle rollers 7 are mounted on the top of the cantilevered structures for improved frictional performance.

The method for generating the cantilever structure according to the present invention is described with reference to fig. 5, and two offset curves 6a and 6b are obtained by offsetting the rotor profile 3a inward, and are used as the groove edge curves of the cantilever structure. The cantilever structure can be obtained by cutting away the rotor part between the offset curves 6a, 6 b.

Referring to fig. 6, an assembly schematic diagram of the cantilever type radial seal structure of the present invention is described, wherein a cylindrical groove 9 is formed at the top of the cantilever structure 6, the length and diameter of the groove are the same as those of the needle roller 7, the needle roller is installed in the groove, cylindrical holes are formed in both the needle roller and the cantilever structure, and the needle roller and the cantilever structure 6 are connected by inserting a cylindrical pin 8 into the cylindrical holes.

The method for selecting the dimensions of the cantilevered radial seal structure is described with reference to fig. 7 and 8.

Referring to fig. 7, the width b of the cantilever structure is the same as the width of the rotor; the length L of the cantilever structure is 1/2-2/3 of the distance from the top of the rotor to the pit, and L is 1/2-2/3L; the thickness s of the cantilever structure is selected to meet the condition of mechanical strength of the material:(wherein σ represents_maxThe maximum gas pressure borne by the rotor, namely the gas pressure in a combustion chamber when the rotor is positioned at a top dead center, is also the maximum value of a pressure curve in a cylinder of the rotor, and has a unit of MPa; [ sigma ]]The maximum bending strength of the cantilever structure material is unit MPa), and the minimum s is selected according to the strength condition; the opening height of the bottom groove is 1-3 mm according to the size of the rotor.

With reference to fig. 8, the length x of the needle groove is 1-3 mm smaller than the width b of the cantilever structure, and the length of the needle roller is x in the same manner; the radius R of two circular surfaces of the needle roller groove is slightly smaller than half of the thickness s of the cantilever structure, R is 1/2s- (0.1-1) mm, and the diameter of the needle roller is R in the same way; the distance y between the circle center O of the circular surface of the needle groove and the top of the rotor is calculated as follows: y is s/2-f, wherein f is a cantileverThe precompression for the structure, precompression f, is calculated as follows:(wherein σ represents_maxThe maximum gas pressure borne by the rotor is unit MPa; e is the modulus of elasticity of the cantilever structure material, in MPa). And finally, forming a hole for inserting the cylindrical pin at the top of the cantilever structure, wherein the radius R of the hole is selected to meet the condition that R is smaller than R, and R can be selected to be 1/2R. The cylindrical pin hole and the needle rolling groove are of concentric circle structures, the length of the cylindrical pin is b, and the radius of the two circular surfaces is r.

In the cantilever type radial sealing device, the cantilever structure has the functions of the traditional single-piece spring and the radial sealing sheet, when the rotor is installed in the cylinder, the cantilever structure can be slightly bent, the deformation generated by bending provides elastic force, the roller pin is pressed on the molded surface of the cylinder, and the good sealing effect between the rotor and the cylinder is ensured. Due to the adoption of a new structural design, the problems of play and vibration of the traditional radial sealing piece do not exist.

According to the cantilever type radial sealing device, the roller pins in the sealing device are directly contacted with the cylinder, the friction mode is rolling friction, and the friction mode between the traditional radial sealing piece and the cylinder is sliding friction. Under the same stress condition, the friction coefficient of rolling friction is smaller than that of sliding friction, so that the friction condition between the rotor and the cylinder can be improved, the abrasion is reduced, and the service life of the rotor sealing device is prolonged.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various changes, modifications, alterations, and substitutions which may be made by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.