Rotary piston expander

Abstract

The invention is suitable for the technical field of engine parts, and provides a rotary piston expander which comprises a piston expander body, the piston expander body is formed by combining a piston bottom cover, a piston top cover, an air inlet valve shell, an air inlet valve element, an exhaust valve shell and an exhaust valve element, and a flexible expansion cavity is formed between the piston bottom cover and the piston top cover; and the flexible expansion cavities are connected to form a sealed cavity and can perform expansion or compression movement. According to the scheme, the flexible expansion cavity is arranged, precise matching between a piston and an air cylinder in a traditional piston engine is omitted, on one hand, the motion resistance of the flexible expansion cavity is very small and is far smaller than the friction resistance between the piston and the air cylinder in the traditional piston engine, and the self-loss of the expansion machine is reduced; on the other hand, precise matching between the piston and the air cylinder does not need to be considered, the requirement for machining precision is greatly lowered, a connection machining mode can be adopted, and meanwhile original linear motion is changed into rotary motion.

Description

Technical Field

[0001] The invention belongs to the technical field of engine components, and in particular relates to a rotary piston expander. Background Art

[0002] Energy conservation and emission reduction have always been the focus of attention in various industries such as energy, chemical industry, electricity, and construction in the new era. Among them, the development and utilization of heat from low-temperature heat sources has always received attention, but the utilization is very difficult. Low-temperature heat sources come from a wide range of sources and are huge in volume, including geothermal, industrial waste heat, solar energy, etc., but according to the second law of thermodynamics and the Carnot cycle, due to the low temperature, the value of these heat sources converted into kinetic energy or electrical energy is very low, and the conversion efficiency is very low. This leads to poor economy when the existing thermodynamic conversion device is used in low-temperature heat source occasions, and sometimes even its self-loss is greater than the energy converted by the low-temperature heat source. Therefore, the current utilization of low-temperature heat sources is more limited to the form of heat utilization, such as the development of geothermal hot spring baths, geothermal heat pumps, industrial waste heat heating, etc., but these heat cannot be used in summer or in areas where heating is not required, so cheaper and more efficient low-temperature heat source expanders are urgently needed to be developed.

[0003] For piston-type expanders and compressors, mechanical losses are mainly in the piston assembly parts. For this reason, the existing technologies (such as patent documents with publication numbers "CN106321280A", "CN106337757A", "CN107401463A", "CN116292496A", "CN117605650A", etc.) use variable-volume pistons to reduce friction losses and leakage losses, thereby achieving the purpose of reducing mechanical losses and providing the possibility for the conversion and utilization of low-temperature waste heat with a temperature less than 150°C. However, in the prior art, the air inlet and exhaust ports of the piston assembly need to use independent valves, and these valves need to be equipped with corresponding control mechanisms (such as cam mechanisms) to control their opening and closing (or switching), and the operation of these control mechanisms requires the consumption of external energy (such as electricity and gas), and the overall energy-saving effect needs to be improved.

[0004] In addition, the cooperation between the piston and the cylinder of a traditional piston engine is relatively precise, and the mechanical cooperation between the piston and the cylinder can satisfy the positioning of the mechanical movement in the process of converting the reciprocating motion of the piston into circular motion. Summary of the invention

[0005] The present invention provides a rotary piston expander, aiming to solve the problems that the current piston and cylinder need to be precisely matched, the expander has large self-consumption, and requires high processing accuracy, and the air inlet and exhaust ports of the piston need to use independent valves. These valves need to be equipped with corresponding control mechanisms, and the control mechanisms need to consume external energy and are not energy-efficient.

[0006] The present invention is implemented as follows: a rotary piston expander comprises: a piston expander body, the piston expander body is composed of a piston bottom cover, a piston top cover, an intake valve housing, an intake valve core, an exhaust valve housing and an exhaust valve core, and a flexible expansion cavity is provided between the piston bottom cover and the piston top cover, and is connected to form a sealed cavity through the flexible expansion cavity, and can expand or compress;

[0007] The piston bottom cover is mounted on the base, and the piston bottom cover is fixed on the piston bottom cover mounting base, and the piston bottom cover mounting base is fixed on the main chassis, the piston top cover is fixed on one end of the rocker and reciprocates with the rocker, the rocker is composed of five follower rockers and a main rocker to form an integral structure, and there is no requirement for the installation order of the 6 rockers, and the other end of the rocker is fixed on the main chassis.

[0008] Preferably, a connecting rod-rocker connecting head is connected to a certain position in the middle of the rocker, the connecting rod-rocker connecting head is connected to the rocker through an axis, and the connecting rod-rocker connecting head can swing around the axis within a certain angle.

[0009] Preferably, one end of the connecting rod-rocker connector away from the rocker is connected and fixed to one end of the connecting rod, the other end of the connecting rod is connected to one connection point on the central turntable through an axis, and the connecting rod can swing around the axis within a certain angle.

[0010] Preferably, at least six connecting rods are provided, and the six connecting rods push the central turntable to perform circular motion, and are combined to form a six-cylinder star engine to output power in parallel.

[0011] Preferably, the intake valve housing and the exhaust valve housing are mounted and fixed on the piston bottom cover, and the piston top cover has two arc-shaped pull rods extending between the intake valve housing and the exhaust valve housing respectively, and the two arc-shaped pull rods pass through the middle of the intake valve core and the exhaust valve core.

[0012] Preferably, the intake valve core and the exhaust valve core are hollow structures in the middle, and the intake valve core and the exhaust valve core are respectively installed in the intake valve housing and the exhaust valve housing, and the intake valve core and the exhaust valve core reciprocate in the intake valve housing and the exhaust valve housing respectively.

[0013] Preferably, the positions of the intake valve core and the exhaust valve core in the intake valve housing and the exhaust valve housing are determined by the movement position of the piston top cover.

[0014] Preferably, when the piston top cover moves to the bottom dead center position, the bosses at the bottom of the two arc-shaped pull rods of the piston top cover push the intake valve core and the exhaust valve core to move to the bottom dead center position, and at the same time, the intake valve core is exposed to the intake hole position on the intake valve housing.

[0015] Preferably, the exhaust valve core moves synchronously to the exhaust hole position on the exhaust valve housing and blocks the exhaust hole.

[0016] Preferably, when the piston top cover moves to the top dead center position, the pull-back buckles arranged on the top of the two arc-shaped pull rods of the piston top cover pull the intake valve core and the exhaust valve core to move to the top dead center position. At this time, the intake valve core moves to the position of the intake hole on the intake valve housing, and at the same time, the exhaust valve core is separated from the position of the exhaust hole on the exhaust valve housing.

[0017] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0018] 1. In the present invention, since the present invention adopts a flexible expansion chamber, the precise fit between the piston and the cylinder in the traditional piston engine is eliminated. On the one hand, the movement resistance of the flexible expansion chamber is very small, which is much smaller than the friction resistance between the piston and the cylinder in the traditional piston engine, thereby reducing the self-consumption of the expander. On the other hand, there is no need to consider the precise fit between the piston and the cylinder, which greatly reduces the processing accuracy requirements and can adopt a connected processing method.

[0019] 2. Since there is no positioning effect between the piston and the cylinder, the movement trajectory of the piston needs to be positioned in other parts. This valve uses a rotary piston instead of a linear piston motion, changing the original linear motion to a rotary motion. The original linear motion needs to be positioned by sliding fit or linear bearings, which either have large resistance or low positioning accuracy and are prone to jamming. However, after adopting rotary motion, ordinary bearings can meet the positioning needs of rotary motion.

[0020] 3. In the present invention, the intake and exhaust valves are integrated on the piston expander body, eliminating the traditional external cam mechanism and avoiding the use of independent control motors and other measures. There are fewer traditional intermediate parts and less self-consumption. In addition, the intake and exhaust valves are separated, and the intake and exhaust valves can also achieve different intake and exhaust durations, thereby achieving an ideal intake volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of a rotary piston expander assembly diagram provided by the present invention;

[0022] Figure 2 It is a schematic diagram of the swinging motion of the rocker and the rotating motion of the central turntable of the present invention;

[0023] Figure 3 It is a schematic diagram of the piston moving to the top dead center and the bottom dead center;

[0024] Figure 4 It is a schematic diagram showing that the valve core moves to the top dead center along with the piston, and the flexible expansion chamber is in an expanded state;

[0025] Figure 5 It is a schematic diagram showing that the valve core moves to the bottom dead center along with the piston, and the flexible expansion chamber is in a contracted state;

[0026] Figure 6 It is a schematic diagram of the appearance of the valve core of the intake valve and the exhaust valve;

[0027] Figure 7 This is a schematic diagram of the valve housing and valve core installation.

[0028] In the figure: 1. connecting rod; 2. connecting rod-rocker connector; 3. follower rocker; 4. center turntable; 5. main rocker; 6. main chassis; 7. piston bottom cover; 8. piston top cover; 9. intake valve housing; 10. intake valve core; 11. exhaust valve housing; 12. exhaust valve core; 13. piston bottom cover mounting base. DETAILED DESCRIPTION

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] The embodiment of the present invention provides a rotary piston expander, such as Figure 1-7 As shown, it comprises: a piston expander body, which is composed of a piston bottom cover 7, a piston top cover 8, an intake valve housing 9, an intake valve core 10, an exhaust valve housing 11 and an exhaust valve core 12, and a flexible expansion cavity is provided between the piston bottom cover 7 and the piston top cover 8, and is connected to form a sealed cavity through the flexible expansion cavity, and can expand or compress;

[0032] The piston bottom cover is mounted on the base 13, the piston bottom cover 7 is fixed on the piston bottom cover mounting base 13, and the piston bottom cover mounting base 13 is fixed on the main chassis 6, the piston top cover 8 is fixed on one end of the rocker and reciprocates with the rocker, the rocker is composed of five follower rockers 3 and a main rocker 5 to form an integral structure, and there is no requirement for the installation order of the 6 rockers, and the other end of the rocker is fixed on the main chassis 6;

[0033] A connecting rod-rocker connector 2 is connected to a certain position in the middle of the rocker, and the connecting rod-rocker connector 2 is connected to the rocker through an axis, and the connecting rod-rocker connector 2 can swing around the axis within a certain angle. The end of the connecting rod-rocker connector 2 away from the rocker is connected and fixed to one end of the connecting rod 1, and the other end of the connecting rod 1 is connected to a connection point on one end of the center turntable 4 through an axis, and the connecting rod 1 can swing around the axis within a certain angle. There are at least 6 connecting rods 1, and the 6 connecting rods 1 push the center turntable 4 to make a circular motion, and are combined to form a 6-cylinder star engine to output power in parallel.

[0034] It should be noted that, since the air inlet and exhaust ports of the piston assembly in the existing expander need to use independent valves, these valves need to be equipped with corresponding control mechanisms (such as cam mechanisms) to control their opening and closing (or switching), and the operation of these control mechanisms requires the consumption of external energy (such as electricity and gas), and the overall energy-saving effect needs to be improved. In addition, the cooperation between the piston and the cylinder of the traditional piston engine is relatively precise, and the mechanical cooperation between the piston and the cylinder can satisfy the positioning of the mechanical movement in the process of converting the reciprocating motion of the piston into the circular motion. In order to solve this problem, a flexible expansion chamber is provided in the present solution, and the precise cooperation between the piston and the cylinder in the traditional piston engine is eliminated. On the one hand, The movement resistance of the flexible expansion chamber is very small, which is much smaller than the friction resistance between the piston and the cylinder in the traditional piston engine, which reduces the self-consumption of the expander. On the other hand, there is no need to consider the precise fit between the piston and the cylinder, which greatly reduces the processing accuracy requirements, and the connection processing method can be adopted. At the same time, since there is no positioning effect between the piston and the cylinder, it is necessary to locate the movement trajectory of the piston in other parts. This valve uses a rotary piston instead of a linear piston motion, and changes the original linear motion into a rotary motion. The original linear motion needs to be positioned by sliding fit or linear bearings, which either have large resistance or low positioning accuracy and are easy to get stuck. However, after adopting the rotary motion, ordinary bearings can meet the positioning requirements of the rotary motion.

[0035] Specifically, in this embodiment, when this solution is used, the six connecting rods 1 push the central rotating disk 4 to make a circular motion, and the rocker is synchronously linked. At this time, the piston top cover 8 follows the rocker to swing back and forth. When the piston top cover 8 moves to the lower dead center position, the bosses at the bottom of the two arc-shaped pull rods of the piston top cover 8 push the intake valve core 10 and the exhaust valve core 12 to move to the lower dead center position. At this time, the intake valve core 10 exposes the position of the intake hole on the intake valve housing 9, and the intake valve is connected to the outside world and is in the intake state. At the same time, the exhaust valve core 12 blocks the position of the exhaust hole on the exhaust valve housing 11, and the exhaust valve is in a closed state. When the piston top cover 8 moves to the upper dead center position, the pull-back buckles at the top of the two arc-shaped pull rods of the piston top cover 8 pull the intake valve core 10 and the exhaust valve core 12 to move to the upper dead center position. At this time, the intake valve core 10 blocks the position of the intake hole on the intake valve housing 9, and the intake valve is not connected to the outside world and is in a closed state. At the same time, the exhaust valve core 12 is exposed from the exhaust hole on the exhaust valve housing 11, and the exhaust valve is in an open state.

[0036] In this embodiment, it should be noted that the arc angle corresponding to the intake valve core 10 is larger than the arc angle corresponding to the exhaust valve core 12. The intake valve core 10 is pulled by the pull-back buckle at the top of the arc-shaped pull rod of the piston top cover 8 in the middle process before the piston reaches the top dead center, and then blocks the intake hole, thereby achieving the purpose of adjusting the intake volume. The pull-back buckle at the top of the arc-shaped pull rod of the piston top cover 8 pulls the intake valve core 10 to move a certain distance in the intake valve housing 9 until the piston top cover 8 moves to the top dead center position. The intake valve core 10 blocks the intake hole of the intake valve housing 9, and the intake valve is always in a closed state.

[0037] In a further preferred embodiment of the present invention, Figure 1-7 As shown, the intake valve housing 9 and the exhaust valve housing 11 are fixedly mounted on the piston bottom cover 7, and the piston top cover 8 has two arc-shaped pull rods extending into between the intake valve housing 9 and the exhaust valve housing 11 respectively, and the two arc-shaped pull rods pass through the middle of the intake valve core 10 and the exhaust valve core 12.

[0038] In this embodiment, the piston top cover 8 can drive the intake valve core 10 and the exhaust valve core 12 to move synchronously through the arc-shaped pull rod.

[0039] In a further preferred embodiment of the present invention, Figure 1-7 As shown, the intake valve core 10 and the exhaust valve core 12 have a hollow structure in the middle, and the intake valve core 10 and the exhaust valve core 12 are respectively installed in the intake valve housing 9 and the exhaust valve housing 11, and the intake valve core 10 and the exhaust valve core 12 reciprocate in the intake valve housing 9 and the exhaust valve housing 11 respectively.

[0040] In this embodiment, the exhaust valve and the intake valve can be quickly connected to and isolated from the outside through the reciprocating motion of the intake valve core 10 and the exhaust valve core 12.

[0041] In a further preferred embodiment of the present invention, Figure 1-7 As shown, the positions of the intake valve core 10 and the exhaust valve core 12 in the intake valve housing 9 and the exhaust valve housing 11 are determined by the movement position of the piston top cover 8. When the piston top cover 8 moves to the bottom dead center position, the bosses at the bottom of the two arc-shaped pull rods of the piston top cover 8 push the intake valve core 10 and the exhaust valve core 12 to move to the bottom dead center position, and at the same time, the intake valve core 10 is exposed to the position of the intake hole on the intake valve housing 9, and the exhaust valve core 12 synchronously moves to the position of the exhaust hole on the exhaust valve housing 11 and blocks the exhaust hole.

[0042] In this embodiment, when the piston top cover 8 moves to the bottom dead center position, the intake valve is connected to the outside and is in an intake state, and at the same time the exhaust valve is in a closed state.

[0043] In a further preferred embodiment of the present invention, Figure 1-7 As shown, when the piston top cover 8 moves to the top dead center position, the pull-back buckles arranged on the top of the two arc-shaped pull rods of the piston top cover 8 pull the intake valve core 10 and the exhaust valve core 12 to move to the top dead center position. At this time, the intake valve core 10 moves to the position of the intake hole on the intake valve housing 9, and at the same time, the exhaust valve core 12 is separated from the position of the exhaust hole on the exhaust valve housing 11.

[0044] In this embodiment, when the piston top cover 8 moves to the top dead center position, the intake valve is disconnected from the outside and is in a closed state, and at the same time, the exhaust valve is in an open state.

[0045] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0046] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of the above-mentioned units. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.

[0047] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A rotary piston expander, characterized in that: include: The piston expander body is composed of a piston bottom cover, a piston top cover, an intake valve housing, an intake valve core, an exhaust valve housing and an exhaust valve core, and a flexible expansion cavity is provided between the piston bottom cover and the piston top cover, and is connected to form a sealed cavity through the flexible expansion cavity, and can expand or compress; The piston bottom cover is mounted on the base, the piston bottom cover is fixed on the piston bottom cover mounting base, and the piston bottom cover mounting base is fixed on the main chassis, the piston top cover is fixed on one end of the rocker and swings back and forth with the rocker, the rocker is composed of five follower rockers and a main rocker to form an integral structure, and there is no requirement for the installation order of the 6 rockers, and the other end of the rocker is fixed on the main chassis.

2. The rotary piston expander according to claim 1, characterized in that A connecting rod-rocker connecting head is connected to a certain position in the middle of the rocker. The connecting rod-rocker connecting head is connected to the rocker through an axis. The connecting rod-rocker connecting head can swing around the axis within a certain angle.

3. The rotary piston expander according to claim 2, characterized in that One end of the connecting rod-rocker connecting head away from the rocker is connected and fixed to one end of the connecting rod, and the other end of the connecting rod is connected to one connection point on the central rotating disk through an axis, and the connecting rod can swing around the axis within a certain angle.

4. The rotary piston expander according to claim 3, characterized in that At least six connecting rods are provided, and the six connecting rods push the central turntable to make circular motion, and are combined to form a six-cylinder star engine to output power in parallel.

5. The rotary piston expander according to claim 1, characterized in that The intake valve housing and the exhaust valve housing are fixedly mounted on the piston bottom cover. Two arc-shaped pull rods are arranged on the piston top cover and extend into between the intake valve housing and the exhaust valve housing respectively, and the two arc-shaped pull rods pass through the middle of the intake valve core and the exhaust valve core.

6. The rotary piston expander according to claim 5, characterized in that The middle of the intake valve core and the exhaust valve core is a hollow structure, and the intake valve core and the exhaust valve core are respectively installed in the intake valve housing and the exhaust valve housing, and the intake valve core and the exhaust valve core reciprocate in the intake valve housing and the exhaust valve housing respectively.

7. The rotary piston expander according to claim 6, characterized in that The positions of the intake valve core and the exhaust valve core in the intake valve housing and the exhaust valve housing are determined by the movement position of the piston top cover.

8. The rotary piston expander according to claim 7, characterized in that When the piston top cover moves to the bottom dead center position, the bosses at the bottom of the two arc-shaped pull rods of the piston top cover push the intake valve core and the exhaust valve core to move to the bottom dead center position, and at the same time, the intake valve core is exposed to the intake hole position on the intake valve housing.

9. The rotary piston expander according to claim 8, characterized in that The exhaust valve core moves synchronously to the exhaust hole position on the exhaust valve housing and blocks the exhaust hole.

10. The rotary piston expander according to claim 8, characterized in that When the piston top cover moves to the top dead center position, the pull-back buckles set on the top of the two arc-shaped pull rods of the piston top cover pull the intake valve core and the exhaust valve core to move to the top dead center position. At this time, the intake valve core moves to the position of the intake hole on the intake valve housing. At the same time, the exhaust valve core is separated from the exhaust hole on the exhaust valve housing.

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