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CN-122014391-A - Heat power conversion device and internal combustion engine waste heat recovery system

CN122014391ACN 122014391 ACN122014391 ACN 122014391ACN-122014391-A

Abstract

The application provides a heat-power conversion device and an internal combustion engine waste heat recovery system, wherein the heat-power conversion device comprises a heat dissipation cylinder, a heat insulation cylinder, an output assembly and a heat exchange assembly, the heat dissipation and heat insulation cylinders are double-acting cylinders, and the inner cavities are respectively divided into two chambers by the piston and are provided with piston rods. The output assembly comprises a mounting frame, an output shaft, connecting rods and a power generation device, wherein the output shaft is provided with double crankshafts which are respectively connected with the two connecting rods and connected with piston rods of two cylinders, the phase angle of the second connecting rod leads the first connecting rod by 80-120 degrees, and the output shaft and the main shaft of the power generation device synchronously rotate. The heat exchange assembly is provided with a heat exchanger with an inlet and an outlet, two heat absorbers are arranged in the heat exchanger, the heat absorbers are respectively communicated with corresponding cylinder chambers and are connected in parallel with one-way conduction branches, heat exchange gas working media are filled in relevant cavities and pipelines of the device, and the heat exchange gas working media are cooperatively used for realizing heat power conversion by the assemblies. According to the technical scheme, the waste heat is efficiently recovered and converted, the vibration of the system is reduced, and the energy output is improved.

Inventors

  • WU TENGMA
  • LIU JING

Assignees

  • 上海运禾环境技术有限公司

Dates

Publication Date
20260512
Application Date
20260316

Claims (13)

  1. 1. The heat power conversion device is characterized by comprising a heat dissipation cylinder (4), a heat insulation cylinder (5), an output assembly (3) and a heat exchange assembly; The heat dissipation cylinder (4) and the heat insulation cylinder (5) are double-acting cylinders; The heat dissipation cylinder (4) comprises a heat dissipation cylinder body (41), a heat dissipation piston (42) and a heat dissipation piston rod (43) connected with the heat dissipation piston (42), the inner cavity of the heat dissipation cylinder (4) is divided into an A1 cavity and an A2 cavity by the heat dissipation piston (42), and the heat dissipation piston rod (43) extends out from one side of the A2 cavity; The heat-insulating cylinder (5) comprises a heat-insulating cylinder body (51), a heat-insulating piston (52) and a heat-insulating piston rod (53) connected with the heat-insulating piston (52), the inner cavity of the heat-insulating cylinder (5) is divided into a B1 cavity and a B2 cavity by the heat-insulating piston (52), and the heat-insulating piston rod (52) extends out from one side of the B2 cavity; The output assembly (3) comprises a mounting frame (31), an output shaft (32), a connecting rod and a power generation device (33), wherein the mounting frame (31) is fixedly arranged, the output shaft (32) is rotatably mounted on the mounting frame (31), one end of the output shaft (32) is connected with a main shaft of the power generation device (33) to synchronously rotate, a first crank part (331) and a second crank part (332) are respectively arranged on the output shaft (32), the connecting rod comprises a first connecting rod (34) and a second connecting rod (35), two ends of the first connecting rod (34) are respectively connected with the first crank part (331) and the end part of a heat dissipation piston rod (43) in a rotating mode, two ends of the second connecting rod (35) are respectively connected with the second crank part (332) and the end part of the heat insulation piston rod (53) in a rotating mode, and the phase angle of the second connecting rod (35) leads the phase angle of the first connecting rod (34) by 80-120 degrees. The heat exchange assembly comprises a heat exchanger (6) with a heat source inlet (601) and a heat source outlet (602), wherein a first heat absorber (61) and a second heat absorber (62) are arranged in the heat exchanger (6), two ends of the first heat absorber (61) are respectively communicated with the A1 cavity and the B1 cavity through pipelines, a first branch (611) which is communicated with the A1 cavity from the B1 cavity in a unidirectional manner is connected with the first heat absorber (61) in parallel, two ends of the second heat absorber (62) are respectively communicated with the A2 cavity and the B2 cavity through pipelines, and a second branch (621) which is communicated with the B2 cavity to the A2 cavity in a unidirectional manner is connected with the second heat absorber (62) in parallel; The heat dissipation cylinder body (61), the heat insulation cylinder body (51), the first heat absorber (61), the second heat absorber (62) and the communication pipeline are filled with heat exchange gas working media.
  2. 2. The heat-power conversion device according to claim 1, comprising a sealed box body, wherein the sealed box body comprises a sealed cover (1) with an upper opening and a sealing plate (2) covering the opening of the sealed cover (1), and a first through hole (21) and a second through hole (22) are formed in the sealing plate (2); the output assembly (3) is fixedly arranged in the sealed box body, and the power generation device (33) is provided with a lead led out of the sealed box body; One end of the heat dissipation cylinder body (41) is opened, the opening end of the heat dissipation cylinder body (41) faces the first through hole (21) and is in sealing connection with the sealing plate (2), the heat dissipation piston (42), the heat dissipation cylinder body (41) and the sealing plate (2) enclose the A2 cavity, and the heat dissipation piston rod (43) penetrates through the first through hole (21) in a sliding sealing mode and stretches into the sealing box body; one end of the heat insulation cylinder body (51) is opened, the opening end of the heat insulation cylinder body (51) faces the second through hole (22) and is in sealing connection with the sealing plate (2), the heat insulation piston (52), the heat insulation cylinder body (51) and the sealing plate (2) enclose the B2 cavity, and the heat insulation piston rod (53) penetrates through the second through hole (22) in a sliding sealing mode and stretches into the sealing box body; And the sealed box body is filled with heat exchange gas working media.
  3. 3. The heat-power conversion device according to claim 2, wherein a guide plate (36) is further mounted on the mounting frame (31), a first guide hole and a second guide hole which are coaxial with the first via hole (21) and the second via hole (22) are respectively arranged on the guide plate (36), the heat dissipation piston rod (43) passes through the first guide hole, and the heat insulation piston rod (53) passes through the second guide hole.
  4. 4. The heat-power conversion device according to claim 1, wherein the outer wall of the heat dissipating cylinder (41) is provided with a plurality of fin structures (411) for dissipating heat.
  5. 5. The heat-power conversion device according to claim 4, wherein a plurality of first fins (421) extending toward an end portion are provided on both sides of the heat-dissipating piston (42), a plurality of second fins (422) extending toward the heat-dissipating piston (42) are provided on both ends of the inner cavity of the heat-dissipating cylinder (41), and the first fins (421) on the same side of the heat-dissipating piston (42) are interposed in the intervals of the second fins (422) on the corresponding side.
  6. 6. The heat-power conversion device according to claim 1, wherein a first one-way valve (612) is arranged on the first branch (611), and the first one-way valve (612) is in one-way conduction from the B1 cavity to the A1 cavity; And a second one-way valve (622) is arranged on the second branch (621), and the second one-way valve (622) is conducted unidirectionally from the B2 cavity to the A2 cavity.
  7. 7. The thermal power conversion device according to claim 1, characterized in that the heat exchange assembly further comprises a first regenerator (7) and a second regenerator (8); The first heat regenerator (7) is arranged on a pipeline connecting the first heat absorber (61) and the A1 cavity, and the second heat regenerator (8) is arranged on a pipeline connecting the second heat absorber (62) and the A2 cavity.
  8. 8. The heat-power conversion device according to any one of claims 1 to 7, characterized in that the phase angle of the second link (35) leads the phase angle of the first link (34) by 90 °.
  9. 9. A thermal power conversion device according to any one of claims 1 to 7, wherein the output assembly (3) further comprises a flywheel (37), the flywheel (37) being mounted at an end of the output shaft (32) remote from the power generation device (33).
  10. 10. The heat-power conversion device according to any one of claims 1 to 7, wherein at least one openable and closable first working medium replenishment port (101) is provided in the heat radiation cylinder (41), the heat insulation cylinder (51), the first heat absorber (61), the second heat absorber (62), and the communication pipe.
  11. 11. The heat power conversion device according to claim 2, wherein the sealing box body is provided with a second working medium supply port (102) which can be opened and closed.
  12. 12. The heat-power conversion device according to claim 11, further comprising a control device (10), a gas working medium supply device (9) and a pressure measuring sensor (91), wherein the gas working medium supply device (9) is connected with the second working medium supply port (102), the pressure measuring sensor (91) is arranged on the sealed box body and is used for measuring the pressure in the sealed box body, the control device (10) is electrically connected with the gas working medium supply device (9) and the pressure measuring sensor (91), and a comparison pressure T0 is preset in the control device (10); The method for regulating and controlling the pressure in the sealed box body comprises the following steps: The control device (10) controls the pressure measuring sensor (81) to collect real-time pressure T1 in the sealed box body according to a set period; The control device (10) judges the magnitudes of the real-time pressure T1 and the comparison pressure T0; if the real-time pressure T1 is greater than or equal to the comparison pressure T0, the current state is maintained; if the real-time pressure T1 is smaller than the comparison pressure T0, the control device (10) controls the gas working medium supplementing device (9) to supplement the heat exchange gas working medium into the sealing box body until the real-time pressure T1 is larger than or equal to the comparison pressure T0.
  13. 13. Waste heat recovery system of an internal combustion engine, characterized by comprising an internal combustion engine and a thermal power conversion device according to any one of claims 1 to 12, the exhaust of the internal combustion engine being in communication with the heat source inlet (601) of the heat exchanger (6) of the thermal power conversion device.

Description

Heat power conversion device and internal combustion engine waste heat recovery system Technical Field The application relates to the technical field of waste heat recovery, in particular to a heat-power conversion device and an internal combustion engine waste heat recovery system. Background In an internal combustion engine power system, the combustion work of fuel such as gasoline, diesel oil and the like in a cylinder is a core process of energy conversion, but the thermal work conversion efficiency of the process is naturally limited, and a large amount of heat energy is directly discharged into the environment along with high-temperature waste gas, so that the problem of low comprehensive energy utilization efficiency of the fuel is caused. The heat energy carried by the discharged high-temperature gas accounts for 40% -45% of the total heat of fuel combustion, and the heat energy carried by the discharged high-temperature gas accounts for 25% -40% of the total heat of fuel combustion. The waste gas discharged after the fuel is combusted has higher temperature, the carried waste heat energy has a considerable proportion, if the part of waste heat energy can be effectively converted into mechanical energy and further converted into electric energy which is output externally, the comprehensive utilization efficiency of the fuel is obviously improved, and the energy waste is reduced, so that the waste heat recycling of the high-temperature waste gas of the internal combustion engine becomes an important research direction in the field, but the power output and power generation utilization technology aiming at the waste heat energy at present is not popularized and applied on a large scale in the market. In order to realize the recovery of the waste heat of the high-temperature exhaust gas of the internal combustion engine, related technical schemes in the field have been explored, for example, a hot air engine is proposed in the patent with the patent application number 202410083227.0 of China, the heat energy is converted into mechanical energy output by a power device, and then the mechanical energy is converted into differential pressure potential energy of an air pump, so as to attempt to realize the recovery and utilization of the waste heat. However, the technical scheme still has a problem to be solved in practical application. In terms of energy conversion, the mechanical energy generated by the scheme can only be reused in the system theoretically, electric energy cannot be output externally, diversified utilization of waste heat energy and external energy supply are difficult to realize, in structural design, one side of a piston in the device is a circulating working medium, the other side of the piston is air, namely, different mediums are adopted at two sides of the piston, the pressure difference at two sides of the piston is large in the working process, gas in a cylinder is easy to leak, and long-term stable operation of the system cannot be maintained. In addition, the large pressure difference on two sides of the piston also enables the system to vibrate obviously during operation, the failure rate of equipment operation is high, and the problems all lead to the technical scheme that the industrial popularization is difficult to realize, and the actual requirements of the field on high-temperature waste gas waste heat high efficiency, stability and industrialization recycling can not be met. Disclosure of Invention The application aims to provide a heat power conversion device and an internal combustion engine waste heat recovery system, which can realize waste heat recovery, realize efficient conversion of waste heat, reduce system vibration and improve the external output energy level. In a first aspect, a thermal power conversion apparatus is provided that includes a heat dissipating cylinder, a heat insulating cylinder, an output assembly, and a heat exchange assembly. The heat dissipation cylinder and the heat insulation cylinder are double-acting cylinders. The heat dissipation cylinder comprises a heat dissipation cylinder body, a heat dissipation piston and a heat dissipation piston rod connected with the heat dissipation piston, wherein the inner cavity of the heat dissipation cylinder is divided into an A1 cavity and an A2 cavity by the heat dissipation piston, and the heat dissipation piston rod extends out from one side of the A2 cavity. The heat-insulating cylinder comprises a heat-insulating cylinder body, a heat-insulating piston and a heat-insulating piston rod connected with the heat-insulating piston, the inner cavity of the heat-insulating cylinder is divided into a B1 cavity and a B2 cavity by the heat-insulating piston, and the heat-insulating piston rod extends out from one side of the B2 cavity. The output assembly comprises a mounting frame, an output shaft, a connecting rod and a power generation device, wherein the mounting frame is fixedly arranged, the output