Swing type piston expander and working method thereof

Abstract

The invention discloses a swing type piston expander and a working method thereof, and relates to the field of gas pressure energy recovery. The expansion machine adopts a rotary structure that the gas distributor, the swing piston shaft and the expansion machine shell are axially nested, a traditional valve gas distribution mechanism is omitted, and periodic gas inlet and gas outlet are achieved through the rotary gas distribution mechanism. In the working process, high-pressure gas enters the expansion cavity through the gas inlet system capable of adjusting the gas inlet pressure, the swing piston shaft is pushed to do work in a reciprocating swing mode, and gas expansion cooling and pressure energy recycling are synchronously completed; and low-temperature exhaust can adapt to different process requirements by regulating and controlling operation parameters of the expansion machine. The device has the advantages of being simple in structure, wide in application range and the like, refrigeration and pressure energy recovery of high-pressure gas can be achieved under the working conditions of small volume flow and large pressure ratio, and a novel device solution is provided for the field of gas pressure energy recovery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas pressure energy recovery, and in particular to a swing type piston expander and a working method thereof. BACKGROUND

[0002] In the field of gas pressure energy recovery, the commonly used expander is mainly a turbine expander. The turbine expander is mainly suitable for large devices, that is, a small pressure ratio, a high rotating speed and a large volume flow rate. The piston expander is suitable for high, medium and low pressure small and medium devices, that is, a large pressure ratio, a low rotating speed and a small volume flow rate. In the existing application, the efficiency of the turbine expander cannot exceed that of the piston expander in the case of high pressure and small flow rate. Therefore, the piston expander still occupies an important position in the field of high pressure gas pressure energy recovery.

[0003] The commonly used turbine expander cannot be applied to some special gas treatment conditions, and the existing piston expander has some application limitations, and its working condition adaptability is poor. The gas flow switching needs to rely on a complex valve group such as an inlet valve and an exhaust valve. In the case of impurity-containing gas or high pressure fluctuation, the valve group is easy to be scoured, blocked or sealed to fail, resulting in frequent equipment shutdown and maintenance. The piston expander has poor adaptability to flow rate changes. In the case of low flow rate or super large flow rate, the matching degree of piston movement and gas flow is reduced, and the pressure energy recovery efficiency is sharply reduced. In the prior art, the piston blade is arranged on the gas distribution shaft. The problems are as follows: 1. The gas distribution shaft is a hollow shaft, and the installation of the blade further weakens the structural strength of the shaft body, which is easy to cause deformation or fatigue damage of the shaft body during operation; 2. Compared with the structure in which the blades are arranged on both sides of the gas distribution shaft, the diameter of the gas distribution shaft in this structure is limited by the diameter of the blade (needs to be matched with the blade), so that the space of the inlet gas passage is compressed, and the inlet gas amount is significantly limited; 3. The gas distribution precision is insufficient: after the blade occupies the limited installation space of the gas distribution shaft, the layout design of the gas distribution hole is severely restricted, thereby reducing the timing control precision of the inlet gas and the exhaust gas, and in the variable flow rate condition, the inlet gas is easy to be insufficient or the exhaust gas is easy to be retained, and it is difficult to adapt to the change of the working condition. Therefore, it is a technical problem to be solved by those skilled in the art to develop a swing type piston expander which is safe in operation and simple in structure and is applied to the field of gas pressure energy recovery. SUMMARY

[0004] The present application provides a swing type piston expander which utilizes gas pressure energy to realize the expansion and refrigeration of gas and is suitable for the pressure energy recovery working condition scene of high pressure and small flow rate.

[0005] The technical scheme of the present application is as follows: a swing piston expander, which comprises an expander shell and an expander housing, upper and lower ends of the expander housing are respectively provided with an upper end cover and a lower end cover, a first gas distributor, a second gas distributor, a swing piston shaft, a transmission system, a piston vane and a static segmentation block are arranged in the expander housing.

[0006] The first gas distributor, the second gas distributor and the swing piston shaft are assembled in the first shaft hole, the second shaft hole and the cylinder of the expander shell through a bearing structure, the bottom plate of the expander shell is rigidly connected with the expander housing through bolts, and the upper part of the first gas distributor, the second gas distributor and the swing piston shaft is connected with the transmission system.

[0007] The first gas distributor and the second gas distributor are axially distributed on both sides of the swing piston shaft to form an expansion working area, the first gas distributor and the second gas distributor are hollow shaft structures and comprise two independent gas cavities, namely an inlet cavity and an outlet cavity.

[0008] Symmetrical fan-shaped static segmentation blocks are arranged in the expansion working area of the expander shell to divide the expansion working area into multiple cylinders, gas passages are arranged on both sides of the static segmentation blocks, one side of the gas passage is communicated with the expansion working area, and the other side is matched with a gas distribution hole arranged on the first gas distributor and the second gas distributor.

[0009] Two fan-shaped piston vanes are symmetrically arranged on the swing piston shaft to form multiple gas expansion cavities together with the static segmentation blocks in the cylinder of the expander shell.

[0010] High-pressure gas enters the inlet cavity below the first gas distributor and the second gas distributor, flows into the expansion cavity through the gas distribution hole on the side of the inlet cavity, pushes the swing piston shaft to complete the expansion, then flows into the outlet cavity above the first gas distributor and the second gas distributor, and finally low-temperature and normal-pressure gas is discharged through the exhaust pipe.

[0011] Further, 2-16 gas distribution holes are arranged on the side of the two gas cavities of the first gas distributor and the second gas distributor, the shape of the passage is fan-shaped, the central angle of the fan-shaped hole of the inlet cavity is 10-150°, the central angle of the fan-shaped hole of the outlet cavity is 60-200°, the outer diameter of the gas cavity is 20-5000mm, the inner diameter of the gas cavity is 20-3000mm, the overall height of the gas cavity is 20-2000mm, and the height of all the holes is 5-500mm.

[0012] Further, 1-6 fan-shaped static segmentation blocks are symmetrically arranged in the expander shell to divide the expansion working area into multiple expansion cavity structures, the central angle of the static segmentation block is 10-30°, and the height is 30-3000mm.

[0013] Further, the expander housing cylinder is provided with 4-8 fixed gas inlet and outlet passages in the axial direction of the static split block, which are square or sector-shaped, and are used to connect with the gas distribution holes on the side of the first and second gas distributors. The central angle of the sector-shaped gas inlet and outlet passage is 5-30°, and the width and height of the square gas inlet and outlet passage are 5-500 mm and 5-500 mm respectively.

[0014] Further, the oscillating piston shaft is provided with 1-10 sector-shaped piston vanes arranged symmetrically, which form an expansion cavity with the sector-shaped static split block on the expander housing. The central angle of the sector-shaped piston vane is 10-70°, the outer diameter is 20-5000 mm, the inner diameter is 20-3000 mm, and the height is 30-3000 mm. The rotation oscillation angle ranges from 20° to 360°.

[0015] Further, the first and second gas distributors and the oscillating piston shaft are respectively kept a gap of 0.05-5 mm with the first shaft hole of the expander housing, the second shaft hole of the expander housing, and the expander housing cylinder.

[0016] A working method of an oscillating piston expander, comprising the following steps:

[0017] S1, high-pressure gas first enters the gas inlet cavity of the gas distributor from the pressure regulating valve, and the high-pressure inlet pressure is adjusted by the inlet regulating valve;

[0018] S2, when the gas distributor side hole starts to connect with the fixed inlet passage on the expander housing, high-pressure gas enters the expansion cavity, and the gas pressure in the expansion cavity rapidly rises; as the connection range expands, the gas pressure in the high-pressure expansion cavity gradually becomes consistent with the inlet pressure;

[0019] S3, in the constant inlet stage, the high-pressure expansion cavity gradually expands; then the inlet passage is no longer in contact with the gas distribution hole, the inlet stops, and the piston vane continues to move due to the pressure difference between the two sides; the exhaust process is synchronized with the inlet process, and the normal-pressure gas on the low-pressure side is continuously discharged through the exhaust port that is always connected, providing a continuous pressure gradient for the piston movement and ensuring the continuity of the expansion process; during the entire gas expansion and cooling process, shaft work is outputted.

[0020] S4, when the piston oscillates to the limit position, the gas pressure in the original high-pressure expansion cavity drops to the normal pressure level; at this time, the low-pressure side exhaust passage is closed, the inlet passage starts to connect, and the low-pressure cavity enters the gas charging and pressure rising stage; the original high-pressure expansion cavity is connected with the exhaust port, and as the cavity pressure difference changes, the piston moves in the opposite direction, repeating the inlet and expansion process of the previous stroke, and finally returning to the starting position, completing a complete movement cycle.

[0021] S5, the low-temperature gas flows out from the other end of the gas distributor, and the pressure is adjusted by a pressure regulating valve; the transmission system transmits the output torque of the swing piston shaft outward, and controls the periodic rotation of the gas distributor, ensuring the stable operation of the expander gas distribution process.

[0022] By opening holes in the side wall of the piston expander cylinder and periodically connecting and opening and closing the holes on the rotating gas distributor, gas distribution is achieved. This design reduces the moving parts of the expander and improves the reliability of the machine operation. The rotating structure has the advantages of low friction and periodic stability, and has a significant advantage in the realization of valveless expanders. The beneficial effects of the present application are:

[0023] 1) Simple structure: the swing piston expander proposed in the present application, the main expansion structure is composed of a gas distributor, an expander shell and a swing piston shaft, which are axially nested and assembled, and the power output and the control of the periodic gas in and out are realized by independent transmission mechanism, the valve structure is cancelled, the residual volume is small, and the installation and maintenance are convenient.

[0024] 2) Wide application range: the inlet pressure in the present application is adjustable, the inlet and outlet time is controlled by the angle and position of the gas distribution hole on the side of the gas distributor, the processing capacity and output power are controllable, and it is mainly suitable for small flow scenes, has high adjustability and can cope with various complex situations.

[0025] 3) High energy conversion efficiency: the swing piston structure adopted in the present application avoids the inertial force loss caused by the reciprocating motion of the traditional linear piston expander, reduces the energy dissipation in the mechanical transmission process, and improves the conversion efficiency of pressure energy to mechanical work.

[0026] 4) Good running stability: the various rotating components of the present application are precisely axially nested and assembled, and are supported and positioned by bearings, ensuring the stability of the movement process. The transmission system is axially distributed on both sides of the swing piston shaft, improving the stability and reliability of the equipment operation, and better meeting the actual application requirements in the scene of gas pressure energy recovery.

[0027] 5) Compared with the traditional rotary piston expander (piston blade set in the gas distribution shaft), the swing piston expander has the following advantages: first, it improves the upper limit of gas processing capacity and can fully recover and efficiently utilize the pressure energy of high-pressure fluid; second, the transmission system is evenly distributed, reducing vibration during equipment operation and improving equipment operation stability and reliability, which better meets the actual application requirements in the scene of gas pressure energy recovery. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a swing piston expander structure schematic diagram.

[0029] Figure 2is a schematic diagram of the gas port phase of the swing piston expander.

[0030] Figure 3 is a schematic diagram of the core structure of the swing piston expander.

[0031] Figure 4 is a simplified structure schematic diagram of the gas distributor.

[0032] Figure 5 is a simplified schematic diagram of the swing piston shaft.

[0033] Figure 6 is a simplified schematic diagram of the expander shell.

[0034] In the figure: 1, first gas distributor; 2, second gas distributor; 3, swing piston shaft; 4, expander shell; 5, expander housing; 6, lower head; 7, upper head; 8, transmission system; 9, piston blade; 10, static partition; 11, first inlet channel; 12, second inlet channel; 13, third inlet channel; 14, fourth inlet channel; 15, first exhaust channel; 16, second exhaust channel; 17, third exhaust channel; 18, fourth exhaust channel; 19, first expansion cavity; 20, second expansion cavity; 21, third expansion cavity; 22, fourth expansion cavity; 23, first high-pressure gas distribution hole; 24, second high-pressure gas distribution hole; 25, first low-pressure gas distribution hole; 26, second low-pressure gas distribution hole; 27, low-pressure exhaust port; 28, expander shell base plate; 29, expander shell first shaft hole; 30, expander shell second shaft hole; 31, expander shell cylinder. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] The swing piston expander provided by the present application is composed of a gas distributor, a swing piston shaft, an expander shell, an upper head, a lower head, and a transmission system.

[0037] Its core expansion area is composed of two gas distributors and an expander shell, and the expander shell has a swing piston shaft and a static partition block to form an expansion chamber. Among them, the expander shell is arranged with a fan-shaped static partition block on the inner side, thereby forming two symmetrically distributed fan-shaped air cylinders; fixed passages are opened on both sides of the static partition block in the axial direction, which are used to connect with the gas distribution holes in the gas distributor, and realize the gas exchange between the inside and outside of the expansion chamber. The swing piston shaft is provided with a certain angle of fan-shaped piston blades, which are nested in the inner side of the expansion shell through bearings, and together form the expansion chamber in the expander.

[0038] The two gas distributors are axially distributed on both sides of the piston blade. The gas distributor is a hollow shaft structure, which is divided into two independent air chambers (high-pressure intake chamber and low-pressure exhaust chamber), and the side wall is provided with a specific angle of gas distribution hole; when the gas distribution hole is connected with the fixed passage on the expander shell, the gas distribution is completed, thereby controlling the entry and exhaust of the gas in the rotating process.

[0039] The specific working method of the present application is:

[0040] The high-pressure gas used for expansion work first enters the intake chamber of the gas distributor from the pressure regulating valve, and the high-pressure intake pressure can be adjusted by the intake regulating valve, so that the equipment can meet the refrigeration and power generation requirements of different working conditions. When the side hole of the gas distributor starts to connect with the fixed intake passage on the expander shell, the high-pressure gas enters the expansion chamber, and the gas pressure in the expansion chamber rises rapidly; as the connection range expands, the gas pressure in the high-pressure expansion chamber gradually keeps consistent with the intake pressure. In the constant intake stage, the high-pressure expansion chamber will gradually expand; then the intake passage is no longer in contact with the gas distribution hole, and the intake stops, and the piston continues to move due to the pressure difference between the two sides. The exhaust process is synchronized with the intake process, and the normal pressure gas on the low-pressure side is continuously discharged through the exhaust port which is always connected, so as to ensure the stability of the low-pressure side and provide a continuous pressure gradient for the piston movement, and ensure the continuity of the expansion process. In the whole gas expansion and cooling process, the shaft power is outputted outward.

[0041] When the piston swings to the limit position, the gas pressure in the original high-pressure expansion chamber decreases to the normal pressure level; at this time, the low-pressure side exhaust passage is closed, the intake passage starts to connect, and the low-pressure chamber enters the charging and pressure increasing stage; while the original high-pressure expansion chamber is connected with the exhaust port, and the piston moves reversely with the change of the cavity pressure difference, repeats the intake and expansion process of the previous stroke, and finally returns to the starting position, completing a complete movement cycle. The low-temperature gas flows out from the other end of the gas distributor, and the pressure can be adjusted through the pressure regulating valve to adapt to different process requirements. The transmission system transmits the output torque of the swing piston shaft outward on one hand, and controls the periodic rotation of the gas distributor on the other hand, to ensure the stable operation of the expander gas distribution process.

[0042] The swing piston expander adopts bearing-based rotor structure, in which the swing piston shaft and the gas distributor are connected with the transmission system, realizing complete constraint of the structure; the gas distributor and the swing piston shaft are assembled in the expander shell through bearings, high-pressure gas enters the gas inlet cavity of the gas distributor, flows into the expansion cavity through the side gas distribution holes, pushes the swing piston shaft to complete the working expansion, and then flows into the gas outlet cavity of the other side gas distributor, and finally the low-temperature and normal-pressure gas is discharged from the gas outlet cavity.

[0043] In some specific embodiments, the gas distributor is a hollow shaft structure, and two independent gas cavities are arranged inside the hollow shaft structure, which are respectively used for high-pressure gas inlet and low-pressure gas outlet; 2-16 gas distribution holes are opened on the side of the two gas cavities, the central angle of the fan-shaped hole opened in the high-pressure gas inlet cavity is 10-150°, the central angle of the fan-shaped hole opened in the low-pressure gas outlet cavity is 60-200°, the width of the square hole is 2-100 mm, the outer diameter of the gas cavity is 20-5000 mm, the inner diameter of the gas cavity is 20-3000 mm, the overall height of the gas cavity is 20-2000 mm, and the height of all the gas distribution holes is 5-500 mm.

[0044] In some specific embodiments, 1-6 fan-shaped static division blocks are symmetrically arranged inside the expander shell, the central angle of the fan-shaped division block is 10-30°, and the height is 30-3000 mm; 4-8 fixed gas inlet and outlet channels are opened between the swing piston shaft and the gas distributor, the channel shape is square or fan-shaped, which is used for connecting with the side gas distribution holes of the first gas distributor and the second gas distributor, the central angle of the fan-shaped gas inlet and outlet channel is 5-30°, the width of the square gas inlet and outlet channel is 5-500 mm, and the height is 5-500 mm.

[0045] In some specific embodiments, 1-10 fan-shaped pistons are arranged on the inner side of the swing piston shaft, which combine with the static division blocks in the expander shell to form the expansion cavity, the central angle of the fan-shaped piston is 10-70°, the outer diameter is 20-5000 mm, the inner diameter is 20-3000 mm, the height is 30-3000 mm, and the rotatable swing angle range is 20-340°.

[0046] In some specific embodiments, a gap of 0.05 mm-5 mm is maintained between the gas distributor, the expander shell and the swing piston shaft.

[0047] Example 1

[0048] As Figure 1The application provides a swing piston expander device, which comprises a first gas distributor 1, a second gas distributor 2, a swing piston shaft 3, an expander shell 4, an expander housing 5, a lower head 6, an upper head 7, a transmission system 8, a piston vane 9 and a static segmentation block 10.

[0049] The upper and lower ends of the expander housing 5 are respectively provided with the upper head 7 and the lower head 6. The first gas distributor 1, the second gas distributor 2 and the swing piston shaft 3 in the expander are respectively assembled on the expander shell first shaft hole 29, the expander shell second shaft hole 30 and the expander shell cylinder 31 through bearing structures, the expander shell bottom plate 28 is rigidly connected with the expander housing 5 through bolts, and the upper sides of the first gas distributor 1, the second gas distributor 2 and the swing piston shaft 3 are connected with the transmission system 8.

[0050] The first gas distributor 1 and the second gas distributor 2 are axially distributed on the two sides of the swing piston shaft 3 and form an expansion working area.

[0051] The expansion working area in the expander shell 4 is internally provided with symmetrically arranged fan-shaped static segmentation blocks 10, which divide the expansion working area into a plurality of cylinders.

[0052] The swing piston shaft is symmetrically provided with fan-shaped piston vanes 9, so that the cylinders in the expansion working area are divided into a plurality of gas expansion cavities.

[0053] High-pressure gas enters the gas inlet cavity below the first gas distributor 1 and the second gas distributor 2, flows into the expansion cavity through the gas distribution hole on the side, pushes the swing piston shaft 3 to complete the work expansion, and then flows into the gas outlet cavity above the first gas distributor 1 and the second gas distributor 2, and finally low-temperature and normal-pressure gas is discharged through the exhaust pipe.

[0054] The gas distributor is hollow inside and divided into upper and lower gas chambers. Its sides have four cross-sections from bottom to top: H1, H2, L1, and L2. Each cross-section corresponds to the gas inlet and outlet state of a gas: H1 and H2 are located in the high-pressure chamber cross-sections of the first gas distributor 1 and the second gas distributor 2, while L1 and L2 are located in the low-pressure chamber cross-sections of the first gas distributor 1 and the second gas distributor 2. The swing piston shaft has one or more fan-shaped blades 9 for driving the movement of the swing piston. The expander housing has one or more static dividing blocks 10 inside, and the piston blades 9 of the swing piston shaft 3 cooperate to form an expansion cylinder.

[0055] like Figure 2 As shown, this is a schematic diagram of the gas distribution port phase of a swing piston expander, involving only the core expansion area and the intake / exhaust channels. The first gas distributor 1 and the second gas distributor 2 are axially distributed on both sides of the swing piston shaft 3. The expansion working area is divided into two parts, and all parameters are the same. In the cross-sectional view of the four-layer gas distribution port, the high-pressure chamber sides of the first gas distributor 1 and the second gas distributor 2 have fan-shaped first high-pressure gas distribution holes 23 and 24 respectively in layers H1 and H2, with a central angle of 120° and an opening height of 35mm; the low-pressure chamber sides have fan-shaped first low-pressure gas distribution holes 25 and 26 respectively in layers L1 and L2, with a central angle of 180° and an opening height of 35mm. The expansion working area inside the expander housing 4 is equipped with two symmetrically arranged sector-shaped static dividing blocks 10, each with a central angle of 20°, a height of 200mm, an outer diameter of 70mm, and an inner diameter of 40mm, dividing the entire expansion working area into two cylinders. Two fixed gas channels are opened on each layer on both sides of the static dividing blocks 10. At section H1, these are the high-pressure first intake channel 11 and the high-pressure second intake channel 12, which respectively cooperate with the first high-pressure gas distribution port 23 located on the two gas distributors. At section H2, there is a high-pressure third intake channel 13. A high-pressure fourth intake passage 14 is provided, which respectively mates with the second high-pressure air distribution port 24 provided on the two gas distributors; a low-pressure first exhaust passage 15 and a low-pressure second exhaust passage 16 are provided in section L1, which respectively mate with the first low-pressure air distribution port 25 provided on the two gas distributors; a low-pressure third exhaust passage 17 and a low-pressure fourth exhaust passage 18 are provided in section L2, which respectively mate with the second low-pressure air distribution port 26 provided on the two gas distributors; all of the above gas passages have a width of 10mm and a height of 35mm. At the same time, two fan-shaped piston blades 9 are symmetrically arranged on the swing piston shaft 3, with a central angle of 20°, dividing the two cylinders into four gas expansion chambers: a first expansion chamber 19, a second expansion chamber 20, a third expansion chamber 21, and a fourth expansion chamber 22.

[0056] In each working process, two cross-section ports work together; at the initial moment, the high-pressure port H1 is connected, and the high-pressure gas enters the first expansion chamber 19 and the third expansion chamber 21 from the gas inlet cavities of the first gas distributor 1 and the second gas distributor 2, the gas expands and pushes the piston to rotate, and after the first gas distributor 1 and the second gas distributor 2 rotate 120°, the gas distribution holes of the gas inlet cavities are not connected with the high-pressure first gas inlet channel 11 and the high-pressure second gas inlet channel 12, while the normal-pressure gas of the second expansion chamber 20 and the fourth expansion chamber 22 is always discharged from the low-pressure second gas outlet channel 16 and the low-pressure third gas outlet channel 17 to the gas outlet cavities in the first gas distributor 1 and the second gas distributor 2, and is not closed until the end of the whole working stroke. Similarly, after the end of the working stroke, the port H2 to be connected is just moved to the beginning of the connection state, and the piston is reversely pushed back to the initial position, and the gas inlet and outlet channel ports return to the connection state at the initial moment.

[0057] The above embodiments are only used to illustrate the present application, and any equivalent transformation and improvement based on the technical scheme of the present application should not be excluded from the protection scope of the present application.

Claims

1. A swing-piston expander comprising an expander housing (4) and an expander shell (5), an upper end and a lower end of the expander shell (5) being provided with an upper head (7) and a lower head (6), respectively, characterized in that The first gas distributor (1), the second gas distributor (2), the swing piston shaft (3), the transmission system (8), the piston vane (9), and the static segmentation block (10) are arranged in the expander housing (5). The first gas distributor (1), the second gas distributor (2), and the swing piston shaft (3) are respectively assembled on the first shaft hole (29) of the expander housing, the second shaft hole (30) of the expander housing, and the cylinder (31) of the expander housing through bearing structures, and the bottom plate (28) of the expander housing is rigidly connected with the expander housing (5) through bolts. The first gas distributor (1) and the second gas distributor (2) are axially distributed on both sides of the swing piston shaft (3) to form an expansion working area. The first gas distributor (1) and the second gas distributor (2) are hollow shaft structures and include two independent gas cavities, namely, an inlet cavity and an outlet cavity. The fan-shaped static segmentation blocks (10) are symmetrically arranged in the expansion working area of the expander housing (4) to divide the expansion working area into multiple cylinders. The fan-shaped piston vanes (9) are symmetrically arranged on the swing piston shaft to divide the cylinders of the expansion working area into multiple gas expansion cavities.

2. A wobble piston expander according to claim 1, wherein High-pressure gas enters the inlet cavities below the first gas distributor (1) and the second gas distributor (2), flows into the expansion cavities through the gas distribution holes on the sides of the first gas distributor (1) and the second gas distributor (2), pushes the swing piston shaft (3) to complete the work expansion, and then flows into the outlet cavities above the first gas distributor (1) and the second gas distributor (2), and finally low-temperature and normal-pressure gas is discharged through the exhaust pipeline.

3. A wobble piston expander according to claim 1, wherein The first gas distributor (1) and the second gas distributor (2) have 2-16 gas distribution holes on the sides of the two gas cavities, and the channel shape is fan-shaped.

4. A wobble piston expander according to claim 1, wherein The expander housing (4) is symmetrically arranged with 1-6 fan-shaped static segmentation blocks (10) to divide the expansion working area into multiple expansion cavity structures, and the central angle of the static segmentation block (10) ranges from 10 to 30 degrees and the height ranges from 30 to 3000 mm. The cylinder (31) of the expander housing has 4-8 fixed gas inlet and outlet channels in the axial direction of the static segmentation block, and the channel shape is square or fan-shaped, which is used for connecting with the gas distribution holes on the sides of the first gas distributor (1) and the second gas distributor (2). The central angle of the fan-shaped gas inlet and outlet channel is 5-30 degrees, the width of the square gas inlet and outlet channel is 5-500 mm, and the height is 5-500 mm.

5. A wobble piston expander according to claim 1, wherein The swing piston shaft (3) is symmetrically arranged with 1-10 fan-shaped piston blades (9), which form an expansion cavity with the fan-shaped static division blocks (10) on the cylinder (31) of the expander housing. The central angle of the fan-shaped piston blades (9) is 10-70°, the outer diameter is 20-5000mm, the inner diameter is 20-3000mm, and the height is 30-3000mm. The rotation swing angle range is 20-360°.

6. A wobble piston expander according to claim 1, wherein The first gas distributor (1), the second gas distributor (2), and the swing piston shaft (3) are respectively arranged with a gap of 0.05mm-5mm with the first shaft hole (29) of the expander housing, the second shaft hole (30) of the expander housing, and the cylinder (31) of the expander housing.

7. A method of operating an oscillating piston expander according to any one of claims 1 to 6, wherein, The method comprises the following steps: S1. High-pressure gas first enters the intake cavity of the gas distributor from the pressure regulating valve, and the high-pressure intake pressure is adjusted by the intake regulating valve. S2. When the side opening of the gas distributor starts to connect with the fixed intake passage of the expander housing, high-pressure gas enters the expansion cavity, and the gas pressure in the expansion cavity rapidly rises. With the expansion of the connection range, the gas pressure in the high-pressure expansion cavity gradually becomes consistent with the intake pressure. S3. In the constant intake stage, the high-pressure expansion cavity gradually expands. Then the intake passage is no longer in contact with the gas distribution hole, the intake stops, and the piston blade continues to move due to the pressure difference between the two sides. The exhaust process is synchronized with the intake process. The normal-pressure gas on the low-pressure side is continuously discharged through the exhaust port that is always connected, providing a continuous pressure gradient for the piston movement and ensuring the continuity of the expansion process. During the entire gas expansion and cooling process, shaft work is outputted outwardly. S4. When the piston swings to the limit position, the gas pressure in the original high-pressure expansion cavity drops to the normal pressure level. At this time, the low-pressure side exhaust passage is closed, the intake passage starts to connect, and the low-pressure cavity enters the charging and pressure increasing stage. The original high-pressure expansion cavity is connected with the exhaust port, and the piston moves reversely with the change of the cavity pressure difference, repeats the intake and expansion process of the previous stroke, and finally returns to the starting position, completing a complete movement cycle. S5. The low-temperature gas flows out from the other end of the gas distributor and is adjusted in pressure by the pressure regulating valve. The transmission system transmits the output torque of the swing piston shaft outwardly, and controls the periodic rotation of the gas distributor, ensuring the stable operation of the expander gas distribution process.

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