A triangular rotor engine with high compression ratio and method for increasing compression ratio

Abstract

The present invention discloses a triangular rotor engine with a high compression ratio and a method for improving the compression ratio, comprising a cylinder body (1), a triangular rotor (2), a phase gear (3), an end cover (4) and an eccentric shaft (5), wherein the cylinder body (1) is provided with an expansion rotor groove (1-1), the expansion rotor groove (1-1) is tangent to and communicates with an air intake chamber (1-2) of the triangular rotor engine, an expansion rotor (6) is arranged inside the expansion rotor groove (1-1), the expansion rotor (6) and the expansion rotor groove (1-1) are matched with a small gap, the expansion rotor (6) is rotatably fixed at both ends on the end cover (4), the expansion rotor (6) is provided with an expansion groove (7), and the expansion rotor (6) and the eccentric shaft (5) rotate synchronously.

Description

Technical Field

[0001] The invention belongs to the technical field of rotary engines, and in particular relates to a triangular rotary engine with a high compression ratio and a method for improving the compression ratio. Background Art

[0002] As a relatively advanced rotary engine, the triangular rotary engine does not have the crank-connecting rod structure and valve train of the reciprocating piston engine. Therefore, the triangular rotary engine has the advantages of simple structure, small size, light weight, stable operation, low noise, and high power-to-weight ratio. However, as a type of rotary engine, the triangular rotary engine has a low compression ratio and the air-fuel ratio cannot be improved, resulting in high fuel consumption, excessive exhaust emissions, and poor use of diesel.

[0003] There are two main methods of increasing the compression ratio of a rotary engine using existing patented technologies. First, the compression ratio is adjusted by changing the combustion chamber structure (rotor combustion chamber pits). Second, grooves are designed on both sides of the rotor to form working cylinders and compression cylinders.

[0004] Whether adjusting the compression ratio by changing the combustion chamber structure (rotor combustion chamber pits) or by designing small grooves on both sides of the rotor to form the working cylinder and the compression cylinder, these methods have little effect on the improvement of the compression ratio and have not significantly increased the compression ratio of the rotary engine. For a triangular rotor engine, it is difficult to increase the compression ratio by 1%. At the same time, the processing technology of the rotor is complex and the manufacturing cost is high. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a triangular rotor engine with a high compression ratio and a method for increasing the compression ratio.

[0006] In order to solve the technical problem, the technical solution of the present invention is: a high compression ratio triangular rotor engine, including a cylinder body, a triangular rotor, a phase gear, an end cover and an eccentric shaft, the cylinder body is provided with an expansion rotor groove, the expansion rotor groove is tangent to and communicated with the intake chamber of the triangular rotor engine, an expansion rotor is arranged inside the expansion rotor groove, the expansion rotor and the expansion rotor groove are matched with a small gap, the two ends of the expansion rotor are respectively rotatably fixed on the end cover, the expansion rotor is provided with an expansion groove, and the expansion rotor rotates synchronously with the eccentric shaft.

[0007] Preferably, the end cover includes a front end cover and a rear end cover, which are fixedly connected to the front and rear ends of the cylinder body respectively, and the space between the front end cover and the rear end cover and the inner wall of the cylinder body forms an inner chamber, and the triangular rotor is arranged in the inner chamber. Radial sealing strips are respectively arranged on the three corners of the triangular rotor, and an eccentric shaft is installed at the center of the triangular rotor. A needle bearing is arranged between the inner hole of the triangular rotor and the eccentric shaft neck of the eccentric shaft, and the phase gear is fixed in the inner hole of the triangular rotor. The phase gear on the triangular rotor is meshed with the external gear fixed on the end cover, and both ends of the main shaft neck of the eccentric shaft are supported in the main bearings of the front end cover and the rear end cover, and the front end of the eccentric shaft passes through the front end cover to connect with the power assembly.

[0008] Preferably, the intake chamber is a space formed by the inner chamber and the intake side of the triangular rotor engine, the triangular rotor and the radial sealing strips at the two apex corners of the triangular rotor. The expanded rotor groove is arranged on the left side of the bottom of the intake chamber. The angle between the line between the geometric center of the cylinder body and the center of the expanded rotor groove and the longitudinal plane of the triangular rotor engine is 10~30°.

[0009] Preferably, the expansion rotor groove is a cylindrical groove, one side wall of the cylindrical groove is tangent to the air intake chamber, and a connecting channel is opened at the tangent point.

[0010] Preferably, the expansion rotor is composed of a first small diameter, a first middle diameter, a large diameter, a second middle diameter and a second small diameter coaxially welded in sequence, the diameters of the first small diameter and the second small diameter are the same, the diameters of the first middle diameter and the second middle diameter are the same, the diameter of the large diameter is larger than the diameter of the first middle diameter or the second middle diameter, and the diameter of the first middle diameter or the second middle diameter is larger than the diameters of the first small diameter and the second small diameter.

[0011] Preferably, the front cover and the rear cover are respectively provided with bearings at positions corresponding to the expansion rotor, the first middle diameter and the second middle diameter are supported and fixed in the bearings, and the first small diameter or the second small diameter passes through the front cover or the rear cover and rotates synchronously with the eccentric shaft through a belt or a gear.

[0012] Preferably, an axial expansion groove is opened on the side of the large diameter, and the large diameter and the expansion rotor groove are matched with a small gap; when air is inhaled, the expansion rotor rotates synchronously with the eccentric shaft to connect the expansion groove with the intake chamber, thereby increasing the volume of the intake chamber.

[0013] Preferably, the gap between the two end faces of the large diameter and the two end covers is 0.1~0.15mm, and the two end faces of the large diameter are respectively provided with end face sealing ring grooves, and the end face sealing rings and end face sealing ring springs are arranged in the end face sealing ring grooves to seal between the two end faces of the large diameter and the two end covers.

[0014] Preferably, the expansion groove is a V-shaped groove, and the angle of the V-shaped groove is 90~120°. The expansion rotor groove is provided with expansion rotor radial sealing strips on both sides of the connecting channel, and the angle between the two expansion rotor radial sealing strips and the center of the expansion groove is greater than the angle of the expansion groove, thereby realizing radial sealing of the expansion groove.

[0015] Preferably, a method for increasing the compression ratio is used to increase the compression ratio of a triangular rotor engine, comprising the following steps:

[0016] Step 1: The expansion rotor and the eccentric shaft of the triangular rotor engine with a high compression ratio are driven by a belt or a gear to rotate synchronously. Since the three apex angles of the triangular rotor and the radial sealing strip divide the inner chamber into three working chambers, the space between any two apex angles and the inner chamber forms a working chamber. When the eccentric shaft rotates one circle, the triangular rotor rotates 1 / 3 circle. Therefore, when the expansion rotor rotates one circle, the triangular rotor rotates 1 / 3 circle.

[0017] Step 2: The pressure generated by the combustion of fuel acts on the triangular rotor. Due to the force arm formed between the center line of the eccentric shaft neck and the center line of the main shaft neck, the eccentric shaft rotates and outputs power in the form of torque, while driving the expansion rotor to rotate clockwise. The phase of the expansion rotor is adjusted so that when the expansion slot of the expansion rotor is opened, one of the three working chambers is in the intake state;

[0018] Step 2-1: When the top corner of one side of the triangular rotor in the working chamber has not passed through the expansion rotor, the expansion slot of the expansion rotor is in a closed state, ensuring that the radial sealing strip at the top corner of the triangular rotor rotates tangentially with the expansion rotor;

[0019] Step 2-2: At the beginning of the first working cycle, the exhaust port of the triangular rotor engine is closed, and when the air inlet is opened, the working room is the air inlet chamber. The radial sealing strip at the top corner of one side of the triangular rotor has passed through the expansion rotor, and the expansion slot of the expansion rotor is in an open state. At this time, the air inlet volume of the working room is expanded;

[0020] Step 2-3: When the intake chamber reaches the intake bottom dead center, it is ready to start the compression stroke. At this time, the expansion rotor presses the gas in the expansion slot into the working chamber through the centrifugal force, and then the expansion slot of the expansion rotor is closed to compress the gas in the working chamber, and the power and exhaust strokes are performed in sequence;

[0021] Step 3: Each working chamber performs intake, compression, power production and exhaust strokes in sequence.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] (1) The present invention discloses a triangular rotor engine with a high compression ratio. An expansion rotor groove is arranged at the bottom of an intake chamber. An expansion rotor is arranged inside the expansion rotor groove. The expansion rotor rotates synchronously with the eccentric shaft. The three vertex angles of the triangular rotor divide the inner chamber into three working chambers. When air is taken in through the expansion rotor groove, any working chamber makes the expansion groove communicate with the intake chamber, thereby increasing the volume of the intake chamber. Then the triangular rotor continues to rotate, and the expansion rotor presses the gas in the expansion groove into the working chamber through the centrifugal force. Then the expansion groove of the expansion rotor is closed, so that the gas in the working chamber is compressed, thereby increasing the volume of the intake chamber when air is taken in. The expansion groove on the expansion rotor periodically makes the three working chambers increase the volume of the intake chamber when air is taken in, thereby improving the compression ratio, which can be improved by 8-10%.

[0024] (2) The present invention discloses a triangular rotor engine with a high compression ratio, which drives the expansion rotor through an eccentric shaft to open and close the V-shaped groove of the expansion rotor, thereby improving the compression ratio. The present invention has a simple processing technology and low manufacturing cost;

[0025] (3) The expansion rotor of the present invention is matched with the expansion rotor slot with a small gap. The expansion rotor slot is provided with expansion rotor radial sealing strips on both sides of the communication channel. The angle between the two expansion rotor radial sealing strips and the top angle of the expansion slot is greater than the angle of the expansion slot. This ensures that the compressed gas will not leak radially through the expansion rotor, thereby synergistically improving the compression ratio.

[0026] (4) The large diameter end faces of the expanded rotor of the present invention are respectively provided with end face sealing ring grooves, and end face sealing rings and end face sealing ring springs are arranged in the end face sealing ring grooves to seal between the large diameter end faces and the two end covers, thereby ensuring that the compressed gas will not leak axially through the expanded rotor, thereby synergistically improving the compression ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 , a schematic structural diagram of a triangular rotor engine with a high compression ratio according to the present invention;

[0028] Figure 2 , a schematic structural diagram of the capacity expansion rotor of the present invention;

[0029] Figure 3 , a diagram showing the use status of a triangular rotor engine with a high compression ratio according to the present invention;

[0030] Figure 4 , a diagram showing the use status of a triangular rotor engine with a high compression ratio according to the present invention;

[0031] Figure 5 , a usage diagram of a high compression ratio triangular rotor engine of the present invention.

[0032] Description of reference numerals:

[0033] 1. Cylinder body, 2. Triangular rotor, 3. Phase gear, 4. End cover, 5. Eccentric shaft, 6. Expansion rotor, 7. Expansion slot, 8. Radial sealing strip, 9. Radial sealing strip of expansion rotor;

[0034] 1-1, expanded rotor slot, 1-2, air intake chamber, 1-3, inner chamber, 1-4, connecting channel;

[0035] 2-1, top angle;

[0036] 6-1, the first small diameter, 6-2, the first medium diameter, 6-3, the large diameter, 6-4, the second medium diameter, 6-5, the second small diameter;

[0037] 6-2-1. End face sealing ring groove. DETAILED DESCRIPTION

[0038] The specific implementation mode of the present invention is described below in conjunction with embodiments:

[0039] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0040] Example 1

[0041] like Figure 1 As shown, the present invention discloses a triangular rotor engine with a high compression ratio, comprising a cylinder body 1, a triangular rotor 2, a phase gear 3, an end cover 4 and an eccentric shaft 5. An expansion rotor slot 1-1 is provided on the main body of the cylinder body 1. The expansion rotor slot 1-1 is tangent to and communicated with an intake chamber 1-2 of the triangular rotor engine. An expansion rotor 6 is arranged inside the expansion rotor slot 1-1. The expansion rotor 6 is matched with the expansion rotor slot 1-1 with a small gap. Both ends of the expansion rotor 6 are rotatably fixed on the end cover 4 respectively. An expansion slot 7 is provided on the expansion rotor 6. The expansion rotor 6 rotates synchronously with the eccentric shaft 5.

[0042] Example 2

[0043] like Figure 1As shown, the end cover 4 includes a front end cover and a rear end cover, which are fixedly connected to the front and rear ends of the cylinder body 1 respectively, and the space between the front end cover and the rear end cover and the inner wall of the cylinder body 1 forms an inner chamber 1-3, and the triangular rotor 2 is arranged in the inner chamber 1-3. Radial sealing strips 8 are respectively arranged on the three corners of the triangular rotor 2. An eccentric shaft 5 is installed in the center of the triangular rotor 2, and a needle bearing is arranged between the inner hole of the triangular rotor 2 and the eccentric shaft neck of the eccentric shaft 5. The phase gear 3 is fixed in the inner hole of the triangular rotor 2, and the phase gear 3 on the triangular rotor 2 is meshed with the external gear fixed on the end cover 4. The two ends of the main shaft neck of the eccentric shaft 5 are supported in the main bearings of the front end cover and the rear end cover, and the front end of the eccentric shaft 5 passes through the front end cover to connect with the power assembly.

[0044] The radial sealing strip 8 is used to seal the triangular rotor 2 and the cylinder body 1 to achieve radial sealing.

[0045] The front end cover, the rear end cover and the cylinder body 4 are positioned by positioning pins, and then the three are fixedly connected by closing bolts.

[0046] Example 3

[0047] like Figure 1 As shown, the intake chamber 1-2 is a space formed by the inner chamber 1-3 and the intake side of the triangular rotor engine, the triangular rotor 2 and the radial sealing strip 8 at the two vertex angles 2-1 of the triangular rotor 2. The expanded rotor slot 1-1 is arranged on the left side of the bottom of the intake chamber 1-2. The angle between the line between the geometric center of the cylinder body 1 and the center of the expanded rotor slot 1-1 and the longitudinal plane of the triangular rotor engine is 10~30°.

[0048] like Figure 1 As shown, the expanded rotor slot 1-1 is a cylindrical slot, one side wall of the cylindrical slot is tangent to the air intake chamber 1-2, and a connecting channel 1-4 is opened at the tangent point.

[0049] Example 4

[0050] like Figure 2 As shown, the expanded rotor 6 is composed of a first small diameter 6-1, a first middle diameter 6-2, a large diameter 6-3, a second middle diameter 6-4 and a second small diameter 6-5 which are coaxially welded in sequence. The diameters of the first small diameter 6-1 and the second small diameter 6-5 are the same, the diameters of the first middle diameter 6-2 and the second middle diameter 6-4 are the same, the diameter of the large diameter 6-3 is larger than the diameter of the first middle diameter 6-2 or the second middle diameter 6-4, and the diameter of the first middle diameter 6-2 or the second middle diameter 6-4 is larger than the diameters of the first small diameter 6-1 and the second small diameter 6-5.

[0051] like Figure 2As shown, the front cover and the rear cover are respectively provided with bearings at positions corresponding to the expansion rotor 6, the first middle diameter 6-2 and the second middle diameter 6-4 are supported and fixed in the bearings, and the first small diameter 6-1 or the second small diameter 6-5 passes through the front cover or the rear cover and rotates synchronously with the eccentric shaft 5 through belts or gears.

[0052] like Figure 2 As shown, the gap between the two end faces of the large diameter 6-3 and the two end covers 4 is 0.1~0.15mm, and the two end faces of the large diameter 6-3 are respectively provided with end face sealing ring grooves 6-2-1, and the end face sealing rings and end face sealing ring springs are arranged in the end face sealing ring grooves 6-2-1 to seal between the two end faces of the large diameter 6-3 and the two end covers 4.

[0053] The two end surfaces of the large diameter 6 - 3 are sealed with the two end covers 4 to ensure that the compressed gas will not leak axially through the expansion rotor 6 .

[0054] Example 5

[0055] like Figure 2 As shown, the expansion groove 7 is a V-shaped groove, and the angle of the V-shaped groove is 90~120°. The expansion rotor groove 1-1 is provided with expansion rotor radial sealing strips 9 on both sides of the connecting channel 1-4, and the angle between the two expansion rotor radial sealing strips 9 and the center of the expansion groove 7 is greater than the angle of the expansion groove 7, thereby realizing radial sealing of the expansion groove 7.

[0056] The expansion groove 7 is designed as a V-shaped groove. When air is taken in, the V-shaped groove of the expansion rotor 6 forms an intake chamber 1-2 with the cylinder body 1, the triangular rotor 2, and the front and rear end covers 4, thereby increasing the volume of the intake chamber.

[0057] The expansion slot 7 may also be designed as a U-shaped slot.

[0058] The expansion rotor radial sealing strip 9 can ensure that the compressed gas will not leak radially through the expansion rotor 6 .

[0059] Example 6

[0060] A method for increasing the compression ratio, for increasing the compression ratio of a triangular rotor engine, comprises the following steps:

[0061] Step 1: The expansion rotor 6 and the eccentric shaft 5 of the triangular rotor engine with a high compression ratio are driven by a belt or a gear to rotate synchronously. Since the three vertex angles 2-1 of the triangular rotor 2 and the radial sealing strip 8 divide the inner chamber 1-3 into three working chambers, the space between any two vertex angles 2-1 and the inner chamber 1-3 forms a working chamber. When the eccentric shaft 5 rotates one circle, the triangular rotor 2 rotates 1 / 3 circle. Therefore, when the expansion rotor 6 rotates one circle, the triangular rotor 2 rotates 1 / 3 circle.

[0062] Step 2: The pressure generated by the combustion of fuel acts on the triangular rotor 2. Since a force arm is formed between the center line of the eccentric shaft neck and the center line of the main shaft neck, the eccentric shaft 5 rotates and outputs power in the form of torque, and at the same time drives the expansion rotor 6 to rotate clockwise. The phase of the expansion rotor 6 is adjusted so that when the expansion slot 7 of the expansion rotor 6 is opened, one of the three working chambers is in the intake state; the pressure generated by the combustion of fuel acts on the triangular rotor 2. Since a force arm is formed between the center line of the eccentric shaft 5 and the center line of the main shaft neck, the eccentric shaft 5 rotates and outputs power in the form of torque;

[0063] Step 2-1: When the top corner 2-1 of the triangular rotor 2 on one side of the working chamber has not passed through the expansion rotor 6, the expansion slot 7 of the expansion rotor 6 is in a closed state, ensuring that the radial sealing strip 8 at the top corner 2-1 of the triangular rotor 2 rotates tangentially with the expansion rotor 6;

[0064] Step 2-2: At the beginning of the first working cycle, the exhaust port of the triangular rotor engine is closed, and when the air inlet is opened, the working room is the air inlet chamber 1-2, and the radial sealing strip 8 at the top corner 2-1 on one side of the triangular rotor 2 has passed through the expansion rotor 6, and the expansion slot 7 of the expansion rotor 6 is in an open state, and the air inlet volume of the working room is expanded;

[0065] Step 2-3: When the intake chamber 1-2 reaches the intake bottom dead center, it is ready to start the compression stroke. At this time, the expansion rotor 6 presses the gas in the expansion slot 7 into the working chamber through the centrifugal force, and then the expansion slot 7 of the expansion rotor 6 is closed to compress the gas in the working chamber, and the power and exhaust strokes are performed in sequence;

[0066] Step 3: Each working chamber performs intake, compression, power production and exhaust strokes in sequence.

[0067] Example 7

[0068] In this embodiment, A, B, and C represent the radial sealing strips 8 of the three vertex angles 2-1 of the rotor. Now, the AB studio is taken as an example to illustrate the change of the position of the triangular rotor 2 in the cylinder body 1 to complete the intake process, wherein the triangular rotor 2 rotates clockwise.

[0069] like Figure 3 As shown, during the air intake process of the engine AB studio, when the B radial sealing strip 8 has not passed through the expansion rotor 6, the V-groove of the expansion rotor 6 is in a closed state, ensuring that the radial sealing strip 8 on the triangular rotor 2 rotates tangentially with the expansion rotor 6, and the AB studio begins to intake air.

[0070] like Figure 4 As shown, when the B radial sealing strip 8 on the triangular rotor 2 rotates past the expansion rotor 6, the AB studio is now the intake chamber 1-2, and the V-groove of the expansion rotor 6 is in an open state. At this time, air enters the AB studio and the intake volume expands.

[0071] like Figure 5 As shown, when the triangular rotor 2 reaches the intake bottom dead center, it is ready to start the compression stroke. At this time, the expansion rotor 6 presses the gas in the V-groove of the expansion rotor 6 into the cylinder body 1 through the centrifugal force, and the V-groove of the expansion rotor 6 is closed, and the AB studio begins to compress, and then the power and exhaust strokes are performed.

[0072] The three working chambers perform intake, compression, power production and exhaust strokes in sequence.

[0073] The working principle of the present invention is as follows:

[0074] like Figures 1 to 5 As shown, the present invention discloses a triangular rotor engine with a high compression ratio, comprising a cylinder body 1, a triangular rotor 2, a phase gear 3, an end cover 4 and an eccentric shaft 5. An expansion rotor groove 1-1 is provided on the main body of the cylinder body 1, and the expansion rotor groove 1-1 is tangent to and communicated with an intake chamber 1-2 of the cylinder body 1. An expansion rotor 6 is arranged inside the expansion rotor groove 1-1, and the expansion rotor 6 is matched with the expansion rotor groove 1-1 with a small gap. Both ends of the expansion rotor 6 are rotatably fixed on the end cover 4, and an expansion groove 7 is provided on the expansion rotor 6. The expansion rotor 6 rotates synchronously with the eccentric shaft 5, and the expansion rotor 6 is driven by the main shaft of the eccentric shaft 5 to realize the opening and closing of the V-shaped groove of the expansion rotor 6, so as to improve the compression ratio, which can be improved by 8-10%.

[0075] The invention discloses a triangular rotor engine with a high compression ratio. An expansion rotor groove is arranged at the bottom of an intake chamber, an expansion rotor is arranged inside the expansion rotor groove, the expansion rotor rotates synchronously with an eccentric shaft, and the three vertex angles of the triangular rotor divide the inner chamber into three working chambers. When air is taken in through the expansion rotor groove, any working chamber makes the expansion groove communicate with the intake chamber, thereby increasing the volume of the intake chamber. Then the triangular rotor continues to rotate, and the expansion rotor presses the gas in the expansion groove into the working chamber through the centrifugal force. Then the expansion groove of the expansion rotor is closed, so that the gas in the working chamber is compressed, thereby increasing the volume of the intake chamber during air intake. The expansion groove on the expansion rotor periodically makes the three working chambers increase the volume of the intake chamber during air intake, thereby improving the compression ratio, which can be improved by 8-10%.

[0076] The invention discloses a triangular rotor engine with a high compression ratio. An eccentric shaft drives an expansion rotor to open and close a V-shaped groove of the expansion rotor, thereby improving the compression ratio. The invention has a simple processing technology and low manufacturing cost.

[0077] The expansion rotor of the present invention is matched with the expansion rotor slot with a small gap. The expansion rotor slot is provided with expansion rotor radial sealing strips on both sides of the connecting channel. The angle between the two expansion rotor radial sealing strips and the top angle of the expansion slot is greater than the angle of the expansion slot. This ensures that the compressed gas will not leak radially through the expansion rotor, thereby synergistically improving the compression ratio.

[0078] The large diameter end faces of the expansion rotor of the present invention are respectively provided with end face sealing ring grooves, and end face sealing rings and end face sealing ring springs are arranged in the end face sealing ring grooves to seal between the large diameter end faces and the two end covers, thereby ensuring that the compressed gas will not leak axially through the expansion rotor, thereby synergistically improving the compression ratio.

[0079] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

[0080] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A triangular rotor engine with a high compression ratio, comprising a cylinder block (1), a triangular rotor (2), a phase gear (3), an end cover (4) and an eccentric shaft (5), characterized in that: The cylinder body (1) is provided with an expansion rotor groove (1-1), the expansion rotor groove (1-1) is tangent to and communicates with the air intake chamber (1-2) of the triangular rotor engine, an expansion rotor (6) is arranged inside the expansion rotor groove (1-1), the expansion rotor (6) and the expansion rotor groove (1-1) are fitted with a small gap, the two ends of the expansion rotor (6) are rotatably fixed on the end cover (4), the expansion rotor (6) is provided with an expansion groove (7), and the expansion rotor (6) rotates synchronously with the eccentric shaft (5); The end cover (4) comprises a front cover and a rear cover, the front cover and the rear cover are respectively fixedly connected to the front and rear ends of the cylinder body (1), the space between the front cover and the rear cover and the inner wall of the cylinder body (1) forms an inner chamber (1-3), the triangular rotor (2) is arranged in the inner chamber (1-3), and radial sealing strips (8) are respectively arranged at the three vertex angles (2-1) of the triangular rotor (2), an eccentric shaft (5) is installed at the center of the triangular rotor (2), a needle bearing is arranged between the inner hole of the triangular rotor (2) and the eccentric shaft neck of the eccentric shaft (5), the phase gear (3) is fixed in the inner hole of the triangular rotor (2), the phase gear (3) on the triangular rotor (2) is meshed with the external gear fixed on the end cover (4), the two ends of the main shaft neck of the eccentric shaft (5) are supported in the main bearings of the front cover and the rear cover, and the front end of the eccentric shaft (5) passes through the front cover to connect with the power assembly; The method for increasing the compression ratio of the triangular rotor engine with a high compression ratio comprises the following steps: Step 1: The expansion rotor (6) and the eccentric shaft (5) are driven by a belt or a gear to rotate synchronously. Since the three apex angles (2-1) of the triangular rotor (2) and the radial sealing strip (8) divide the inner chamber (1-3) into three working chambers, the space between any two apex angles (2-1) and the inner chamber (1-3) forms a working chamber. When the eccentric shaft (5) rotates one circle, the triangular rotor (2) rotates 1 / 3 circle. Therefore, when the expansion rotor (6) rotates one circle, the triangular rotor (2) rotates 1 / 3 circle. Step 2: The pressure generated by the combustion of the fuel acts on the triangular rotor (2). Due to the force arm formed between the center line of the eccentric shaft neck and the center line of the main shaft neck, the eccentric shaft (5) rotates and outputs power in the form of torque, while driving the expansion rotor (6) to rotate clockwise. The phase of the expansion rotor (6) is adjusted so that when the expansion slot (7) of the expansion rotor (6) is opened, one of the three working chambers is in the intake state; Step 3: Each working chamber performs intake, compression, power production and exhaust strokes in sequence.

2. A high compression ratio triangular rotor engine according to claim 1, characterized in that: The air intake chamber (1-2) is a space formed by the inner chamber (1-3) and the air intake side of the triangular rotor engine, the triangular rotor (2) and the radial sealing strip (8) at the two vertex angles (2-1) of the triangular rotor (2); the expanded rotor groove (1-1) is arranged on the left side of the bottom of the air intake chamber (1-2); and the angle between the line between the geometric center of the cylinder body (1) and the center of the expanded rotor groove (1-1) and the longitudinal plane of the triangular rotor engine is 10 to 30 degrees.

3. A high compression ratio triangular rotor engine according to claim 2, characterized in that: The expanded rotor slot (1-1) is a cylindrical slot, one side wall of the cylindrical slot is tangent to the air intake chamber (1-2), and a connecting channel (1-4) is provided at the tangent point.

4. A high compression ratio triangular rotor engine according to claim 1, characterized in that: The expansion rotor (6) is composed of a first small diameter (6-1), a first middle diameter (6-2), a large diameter (6-3), a second middle diameter (6-4) and a second small diameter (6-5) which are coaxially welded in sequence; the first small diameter (6-1) and the second small diameter (6-5) have the same diameter; the first middle diameter (6-2) and the second middle diameter (6-4) have the same diameter; the diameter of the large diameter (6-3) is larger than the diameter of the first middle diameter (6-2) or the second middle diameter (6-4); and the diameter of the first middle diameter (6-2) or the second middle diameter (6-4) is larger than the diameter of the first small diameter (6-1) and the second small diameter (6-5).

5. A high compression ratio triangular rotor engine according to claim 4, characterized in that: The front end cover and the rear end cover are respectively provided with bearings at positions corresponding to the expansion rotor (6); the first middle diameter (6-2) and the second middle diameter (6-4) are supported and fixed in the bearings; the first small diameter (6-1) or the second small diameter (6-5) passes through the front end cover or the rear end cover and rotates synchronously with the eccentric shaft (5) via a belt or a gear.

6. A triangular rotor engine with a high compression ratio according to claim 4, characterized in that: An axial expansion groove (7) is provided on one side of the large diameter (6-3), and the large diameter (6-3) is matched with the expansion rotor groove (1-1) with a small gap; when air is inhaled, the expansion rotor (6) rotates synchronously with the eccentric shaft (5) so that the expansion groove (7) is connected with the air intake chamber (1-2), thereby increasing the volume of the air intake chamber (1-2).

7. A high compression ratio triangular rotor engine according to claim 4, characterized in that: The clearance between the two end faces of the large diameter (6-3) and the two end covers (4) is 0.1-0.15 mm. The two end faces of the large diameter (6-3) are respectively provided with end face sealing ring grooves (6-2-1). An end face sealing ring and an end face sealing ring spring are provided in the end face sealing ring grooves (6-2-1) so as to seal between the two end faces of the large diameter (6-3) and the two end covers (4).

8. A high compression ratio triangular rotor engine according to claim 3, characterized in that: The expansion groove (7) is a V-shaped groove, the angle of the V-shaped groove is 90-120 degrees, and the expansion rotor groove (1-1) is provided with expansion rotor radial sealing strips (9) on both sides of the connecting channel (1-4), and the angle between the two expansion rotor radial sealing strips (9) and the center of the expansion groove (7) is greater than the angle of the expansion groove (7), thereby achieving radial sealing of the expansion groove (7).

9. A high compression ratio triangular rotor engine according to claim 1, characterized in that: The step 2 is specifically as follows: Step 2-1: When the top corner (2-1) on one side of the triangular rotor (2) in the working chamber has not passed through the expansion rotor (6), the expansion slot (7) of the expansion rotor (6) is in a closed state, ensuring that the radial sealing strip (8) at the top corner (2-1) of the triangular rotor (2) rotates tangentially with the expansion rotor (6); Step 2-2: When the first working cycle starts, the exhaust port of the triangular rotor engine is closed and the air inlet is opened, the working chamber is the air inlet chamber (1-2), the radial sealing strip (8) at the top corner (2-1) of one side of the triangular rotor (2) has passed through the expansion rotor (6), and the expansion slot (7) of the expansion rotor (6) is in an open state. At this time, the air inlet volume of the working chamber is expanded; Step 2-3: When the intake chamber (1-2) reaches the intake bottom dead center, it is ready to start the compression stroke. At this time, the expansion rotor (6) presses the gas in the expansion groove (7) into the working chamber through the centrifugal force. Then the expansion groove (7) of the expansion rotor (6) is closed, so that the gas in the working chamber is compressed, and the power and exhaust strokes are performed in sequence.

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