Heat regeneration device and Stirling engine

Abstract

The utility model discloses a backheating device and Stirling engine, the backheating device has axial direction, and the backheating device comprises a plurality of plates, the plurality of plates are stacked along the axial direction, each plate is provided with a plurality of airflow through holes, and at least part of the airflow through holes of the plurality of plates are correspondingly arranged to form an airflow channel which is through along the axial direction. And at least one end of each plate in the axial direction is provided with a heat insulation layer. The heat regeneration device has high axial thermal resistance and low radial thermal resistance, pressure loss of gas at the two ends of the heat regeneration device in the axial direction can be reduced, the heat regeneration efficiency of the heat regeneration device can be improved, the structure is simple, the manufacturing cost can be reduced, and the service life can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat engine technical field especially relates to a regenerative device and stirling machine. BACKGROUND

[0002] The regenerator in the prior art generally includes two kinds, which are filler type regenerator and plate type regenerator. The former is more common sintered wire mesh type and silk floss type regenerator, because the wire diameter of sintered wire mesh type and silk floss type is small, and the flow channel is complex, leading to large pressure loss of gas at both ends of the regenerator, which affects the regenerative efficiency of the regenerator. The flow channel of the latter is relatively uniform, but the axial thermal resistance is small, which also affects the regenerative efficiency of the regenerator. SUMMARY

[0003] The utility model aims at at least one of the prior art technical problems. Therefore, one purpose of the utility model is to provide a regenerative device, which can increase axial thermal resistance and reduce pressure loss of gas, and can improve regenerative efficiency.

[0004] The utility model also aims at providing a stirling machine to apply the above regenerative device.

[0005] According to the regenerative device of the utility model embodiment, the regenerative device has an axial direction, and the regenerative device includes a plurality of plates, the plurality of plates are arranged in a stacked manner along the axial direction, each plate is provided with a plurality of airflow through holes, and at least part of the airflow through holes of the plurality of plates are arranged correspondingly to form an airflow channel penetrating along the axial direction. Each plate is provided with a heat insulation layer at at least one end in the axial direction.

[0006] According to the regenerative device of the utility model embodiment, at least one end of the axial direction of the stacked plurality of plates is provided with a heat insulation layer, and part of the airflow through holes on the plurality of plates are correspondingly formed into an airflow channel, so that the regenerative device has high axial thermal resistance and low radial thermal resistance, and a regular flow channel can also be obtained, which is beneficial to reducing the flow resistance of gas and reducing the pressure loss of gas at both ends of the regenerative device in the axial direction, thereby improving the regenerative efficiency of the regenerative device. Moreover, the structure is relatively simple, and the manufacturing cost can be reduced. Due to the characteristics of high axial thermal resistance and low flow resistance of the regenerative device, the unit resistance heat exchange capacity can be improved, the overall structure can be more compact, the axial design size can be reduced, the cost can be reduced, the overall structural strength is higher, and the service life is longer.

[0007] In some embodiments of the utility model, the plate and the heat insulation layer are an integral structure, and the heat insulation layer is a coating covering the plate.

[0008] In some embodiments of the utility model, the board piece is provided with the heat insulation layer at both ends of the axial direction.

[0009] In some embodiments of the utility model, the board piece and the heat insulation layer are of a split structure, the heat insulation layer is a heat insulation plate, and is arranged between two adjacent board pieces.

[0010] In some embodiments of the utility model, the thickness of the board piece is f in the axial direction, and the thickness or the sum of the thicknesses of the heat insulation layer between any two adjacent board pieces is ft, wherein ft≤0.2f.

[0011] In some embodiments of the utility model, the board piece is a circular plate, and the airflow through hole is a circular hole.

[0012] In some embodiments of the utility model, the airflow through hole is provided with multiple rows on the board piece, and each row of the airflow through hole is provided with multiple airflow through holes.

[0013] In some embodiments of the utility model, the porosity of the heat recovery device is e, the pressure drop of the airflow channel at both ends of the axial direction is dp, and the following is met:

[0014] e=(N * π * d 2 / 4) / (π * D 2 / 4);

[0015] dP=h(A * vis * u+B * den * u 2 );

[0016] Wherein, N is the number of the airflow through hole; d is the diameter of the airflow through hole, in mm; D is the diameter of the board piece, in mm; h is the length of the heat recovery device in the axial direction, in mm; A and B are experimental calibration coefficients; vis is the gas viscosity of the gas passing through the heat recovery device, in m 2 / s; den is the density of the gas passing through the heat recovery device, in kg / m 3 ; u is the gas velocity, in m / s.

[0017] In some embodiments of the utility model, the airflow through hole is arranged in multiple and forms an annular structure around the circumferential direction of the board piece, and the annular structure is provided in multiple along the radial direction of the board piece.

[0018] In some embodiments of the utility model, the porosity of the heat recovery device is e, and the following is met:

[0019] e=M * π * d 2 / (π * D 2 / 4);

[0020]

[0021] D*sin(theta)≥4*beta;

[0022] Wherein, d is the diameter of the airflow through hole, unit: mm; D is the diameter of the plate, unit: mm; M is the number of the airflow through hole of each plate; r i is the radius of the i th ring structure from the center of the plate, unit: mm; theta is the included angle of any two adjacent rows of airflow through holes arranged in the radial direction of the plate, unit: °; beta is the spacing of any two adjacent ring structures in the radial direction of the plate, unit: mm.

[0023] In some embodiments of the utility model, the diameter of the airflow through hole is d, and the porosity of the regenerative device is e, wherein d≥0.1mm, e≥0.8.

[0024] In some embodiments of the utility model, the plate is provided with a positioning convex part at one end in the axial direction and a plurality of positioning concave parts at the other end, and the positioning convex part of one of any two adjacent plates is selectively matched with one of the plurality of positioning concave parts of the other plate.

[0025] In some embodiments of the utility model, the plurality of airflow through holes of each plate are strip-shaped holes and are arranged at intervals in a first direction, and each airflow through hole extends along a second direction perpendicular to the first direction.

[0026] In some embodiments of the utility model, the porosity of the regenerative device is e, and satisfies:

[0027] e=h1*(h-h2*M) / h2;

[0028] Wherein, h is the length of the regenerative device in the axial direction, unit: mm; h1 is the width dimension of the airflow through hole, unit: mm; h2 is the gap between the two ends of the plate and the adjacent airflow through hole in the width direction of the airflow through hole, unit: mm; M is the number of the airflow through hole.

[0029] In some embodiments of the utility model, in the plurality of plates, the airflow through holes of any two adjacent plates can be staggered and partially overlapped.

[0030] A Stirling machine according to an embodiment of the utility model comprises the regenerative device as claimed in any one of the preceding embodiments.

[0031] A Stirling machine according to an embodiment of the utility model

[0032] Additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be learned by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0034] Figure 1 is a perspective structural schematic view of a heat recovery device provided by some embodiments of the present application;

[0035] Figure 2 is a cross-sectional view of the internal structure of the heat recovery device provided by some embodiments of the present application;

[0036] Figure 3 is a partial structural schematic view of the heat recovery device provided by some embodiments of the present application;

[0037] Figure 4 is a structural schematic view of a heat recovery device provided by another embodiment of the present application;

[0038] Figure 5 is a partial structural schematic view of the heat recovery device provided by another embodiment of the present application;

[0039] Figure 6 is a structural schematic view of a heat recovery device provided by yet another embodiment of the present application;

[0040] Figure 7 is a partial structural schematic view of the heat recovery device provided by yet another embodiment of the present application;

[0041] Figure 8 is a structural schematic view of a heat recovery device provided by still another embodiment of the present application Figure 1 ;

[0042] Figure 9 is a structural schematic view of a heat recovery device provided by still another embodiment of the present application Figure 2 ;

[0043] Figure 10 is a structural schematic view of a heat recovery device provided by still another embodiment of the present application Figure 3 ;

[0044] Figure 11 is a structural schematic view of a heat recovery device provided by still another embodiment of the present application Figure 4 .

[0045] REFERENCE NUMERALS:

[0046] 100, regenerative device; 10, plate; 10a, air flow through hole; 10b, positioning convex part; 10c, positioning concave part; 10d, air flow channel; 20, heat insulation layer; 20a, avoidance hole. DETAILED DESCRIPTION

[0047] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0048] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0049] In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features, which are used to distinguish the described features, and have no order or priority.

[0050] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0051] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] The regenerative device 100 according to the embodiments of the present application will be described below with reference to Figures 1-11

[0053] As Figure 1 and Figure 2 ​As shown, according to the heat recovery device 100 of the embodiment of the present application, the heat recovery device 100 has an axial direction, and the heat recovery device 100 comprises a plurality of plate members 10, the plurality of plate members 10 are arranged in a stacked manner along the axial direction, each plate member 10 is provided with a plurality of airflow through holes 10a, at least part of the airflow through holes 10a of the plurality of plate members 10 are arranged correspondingly to form an airflow channel 10d penetrating along the axial direction, and each plate member 10 is provided with a heat insulation layer 20 at at least one end in the axial direction.

[0054] The "axial direction of the heat recovery device 100" can refer to the front-rear direction of the heat recovery device 100. Figure 1 and Figure 2 .

[0055] The heat recovery device 100 can be formed by sequentially stacking a plurality of plate members 10 in the axial direction. The plate member 10 can be a component made of metal material, which can be but is not limited to stainless steel and the like. The airflow through hole 10a can be a through hole penetrating the plate member 10. Alternatively, the airflow through hole 10a can be machined on the plate member 10 made of metal material by etching.

[0056] The airflow through holes 10a of the plurality of plate members 10 can be one-to-one correspondence, so that the plate member 10 is provided with a certain number of airflow through holes 10a, and the plurality of plate members 10 can form a corresponding number of airflow channels 10d. The airflow through holes 10a of the plurality of plate members 20 can also be one-to-one correspondence in part, that is, the number of airflow channels 10d formed between the plurality of plate members 10 is less than the number of airflow through holes 10a of each plate member 10.

[0057] The heat insulation layer 20 can be a structure or component that can play a heat insulation role. Each plate member 10 can be provided with a heat insulation layer 20 at one end in the axial direction, or can be provided with a heat insulation layer 20 at both ends in the axial direction. The material of the heat insulation layer 20 can include but is not limited to rock wool, glass wool, polyurethane foam, aerogel or ceramic and the like, which is not limited here. The heat insulation layer 20 is provided with a corresponding avoiding hole 20a corresponding to the plurality of airflow through holes 10a of the plate member 10.

[0058] It can be understood that when the heat recovery device 100 works, the gas flows alternately in the airflow channel 10d (the gas flows reciprocally in the airflow channel 10d along the axial direction), and the gas with high heat passes through each plate member 10. Since there is a heat insulation layer 20 between the two adjacent plate members 10, the heat insulation layer 20 can block the heat transfer between the two adjacent plate members 10, thereby reducing the heat loss of the heat recovery device 100 in the axial direction as a whole, and the heat can be stored on the plurality of plate members 10, so that the heat recovery device 100 can have high axial thermal resistance.

[0059] When the gas passes through each plate piece 10, due to the blocking of the heat insulation layer 20, heat can be uniformly diffused to the corresponding whole plate piece 10, so that the plate piece 10 has high heat uniformity in the radial direction (a direction perpendicular to the axial direction), so that the heat recovery device 100 has low radial thermal resistance.

[0060] At the same time, since the part gas flows through the holes 10a of the plurality of plate pieces 10 correspondingly form the unobstructed gas flow channel 10d, therefore, in the process of passing through the gas flow channel 10d, the gas flows from one end to the other end of the axial direction of the heat recovery device 100, due to the relatively regular gas flow channel 10d, the flow resistance is relatively small, and the pressure loss of the alternating flow of the gas is relatively small.

[0061] According to the heat recovery device 100 of the embodiment of the utility model, by setting the heat insulation layer 20 at least one end of the axial direction of the stacked plurality of plate pieces 10, and correspondingly forming the gas flow channel 10d on the plurality of plate pieces 10 Part gas flow through hole 10a, thereby can make the heat recovery device 100 have high axial thermal resistance and low radial thermal resistance, also can get regular flow channel, is favorable to reduce the flow resistance of the gas, reduce the pressure loss of the gas at both ends of the axial direction of the heat recovery device 100, thereby can improve the heat recovery efficiency of the heat recovery device 100, and the structure is relatively simple, can reduce manufacturing cost. Due to the characteristics of high axial thermal resistance and low flow resistance of the heat recovery device 100, the unit resistance heat exchange capacity can be improved, the overall structure can be more compact, the axial design size can also be reduced, the cost can be reduced, and the overall structural strength is higher, has longer service life.

[0062] In some embodiments of the utility model, the plate piece 10 and the heat insulation layer 20 are integrated structure, and the heat insulation layer 20 is the coating covering the plate piece 10.

[0063] It can be understood that, by setting the heat insulation layer 20 as the coating covering the plate piece 10, thereby can enhance the combination tightness and firmness of the heat insulation layer 20 and the plate piece 10, enhance the effect of heat insulation layer 20 blocking heat transfer between adjacent two plate pieces 10, also can reduce the risk of loosening between heat insulation layer 20 and plate piece 10 affecting the heat insulation effect, thereby can improve the stability of high axial thermal resistance of the heat recovery device 100. Secondly, the plate piece 10 and the heat insulation layer 20 are integrated structure, can reduce the number of parts of the heat recovery device 100, reduce the assembly steps, also can improve the assembly efficiency.

[0064] In some embodiments of the utility model, as Figure 2As shown, the plate member 10 is provided with a heat insulation layer 20 at both ends in the axial direction. In the above technical solution, the end faces of the plate member 10 at both ends in the axial direction are coated with the heat insulation layer 20, so that when coating or spraying the coating, it is not necessary to consider which end face of the plate member 10 is coated or sprayed, the coating manufacturing process can be simplified, and the coating manufacturing difficulty is reduced. The above scheme can also reduce the risk of no heat insulation layer 20 between the adjacent two plate members 10 due to reverse installation during the stacking of multiple plate members 10, reduce the assembly error probability, and improve the product quality of the heat recovery device 100.

[0065] In some embodiments of the present application, as shown in Figure 3 The plate member 10 and the heat insulation layer 20 are in a split structure, the heat insulation layer 20 is a heat insulation plate, and is attached between the adjacent two plate members 10.

[0066] It can be understood that the heat insulation layer 20 can be an independent component and is clamped between the adjacent two plate members 10 and is installed on the plate members 10 at both ends in the axial direction in the heat recovery device 100. The split structure scheme is beneficial to the maintenance or replacement of the heat insulation layer 20, and when one or more of the multiple heat insulation layers 20 are damaged, the damaged heat insulation layer 20 can be maintained or replaced, thereby reducing the use cost.

[0067] In some embodiments of the present application, the material of the heat insulation layer 20 is ceramic. For example, when the heat insulation layer 20 is a coating at one end or both ends of the plate member 10 in the axial direction, the heat insulation layer 20 can be formed on the surface of the plate member 10 by ceramic spraying. When the heat insulation layer 20 is a clamping component between the adjacent plate members 10, the heat insulation layer 20 can be a ceramic sheet.

[0068] In the above technical solution, the ceramic has good chemical stability, high melting point and high temperature resistance, long service life, and can improve the heat insulation stability. At the same time, the ceramic has a low thermal conductivity, can better block the heat transfer between the adjacent two plate members 10, and can increase the axial thermal resistance.

[0069] In some embodiments of the present application, the material of the heat insulation layer 20 is polytetrafluoroethylene (PTFE). As described above, whether the heat insulation layer 20 is a coating or a clamping component, it can be hard polytetrafluoroethylene, which is easy to process, has high adhesion to the plate member 10, high strength, high temperature resistance, is not easy to damage, has a small thermal expansion coefficient, and can make the heat insulation layer 20 have good heat insulation effect.

[0070] In some embodiments of the present application, as shown in Figure 3 and Figure 5 In the axial direction, the thickness of the plate member 10 is f, and the thickness or the sum of the thicknesses of the heat insulation layer 20 between any adjacent two plate members 10 is ft, wherein ft≤0.2f.

[0071] It can be understood that, with reference to Figure 3 , one end of the axial direction of each plate piece 10 is provided with a heat insulation layer 20, and the adjacent two plate pieces 10 are blocked by one heat insulation layer 20, so that the thickness of the heat insulation layer 20 between any two adjacent plate pieces 10 is ft, and the thickness of the plate piece 10 in the axial direction is f. Both ends of the axial direction of the plate piece 10 can also be provided with a heat insulation layer 20, so that there are two heat insulation layers 20 between the adjacent two plate pieces 20, and the thickness of each heat insulation layer 20 is ft1, and the sum of the thicknesses of the two heat insulation layers 20 is ft.

[0072] In the above embodiment, whether the heat insulation layer 20 between the two plate pieces 10 is one or two, ft is less than or equal to 0.2f, that is, ft can be but not limited to 0.2f, 0.18f, 0.16f, 0.14f, 0.12f, 0.1f, 0.08f, 0.06f, 0.04f, 0.02f, 0.01f, etc.

[0073] For the assembly composed of a single plate piece 10 and a corresponding heat insulation layer 20, the formula for calculating the axial thermal resistance is λeff=1 / (f / λp+ft / λc), where λeff is the effective thermal conductivity of the assembly composed of the plate piece 10 and the heat insulation layer 20, the unit is W / (mK), λp is the thermal conductivity of the plate piece 10, the unit is W / (mK), and λc is the thermal conductivity of the heat insulation layer 20, the unit is W / (mK). It can be understood that the thermal conductivity of the assembly obtained by using the above-mentioned plate piece 10 and heat insulation layer 20 can reduce the axial thermal conductivity of the whole regenerative device 100 by more than 80%, so that the regenerative device 100 can have higher axial thermal resistance.

[0074] In the above technical scheme, by setting the thickness of the plate piece 10 and the thickness or the sum of the thicknesses of the heat insulation layer 20 between any two adjacent plate pieces 10 in the above range, the axial thermal conductivity of the regenerative device 100 can be effectively reduced, so that the regenerative device 100 has higher axial thermal resistance, which is beneficial to improve the regenerative efficiency.

[0075] In some embodiments of the present application, as shown in Figure 4 and Figure 6 , the plate piece 10 is a circular plate, and the airflow hole 10a is a circular hole.

[0076] It can be understood that the plate member 10 is a circular plate, so that the whole regenerative device 100 is circular, and the circular regenerative device 100 has a greater circumference and can have a greater heat exchange area under the condition of a given cross-sectional area. The plate member 10 of the circular structure is also beneficial to uniform heat transfer in the circumferential direction, has higher radial heat uniformity, and makes the temperature distribution of the wall surface of the regenerative device 100 more uniform. Secondly, the circular plate member 10 and the circular airflow through hole 10a are easy to process, and the manufacturing cost can be reduced.

[0077] In some embodiments of the utility model, as shown in Figure 4 The airflow through hole 10a is provided with multiple rows on the plate member 10, and the airflow through hole 10a of each row is provided with multiple airflow through holes. By adopting this arrangement mode of the airflow through hole 10a (which can be recorded as the first arrangement mode of the airflow through hole 10a), the number of the airflow through hole 10a can be increased, and the arrangement of the airflow through hole 10a on the plate member 10 is more compact, which is beneficial to increasing the porosity of the regenerative device 100.

[0078] In some embodiments of the utility model, the porosity of the regenerative device 100 is e, the pressure drop of the airflow channel 10d at both ends in the axial direction is dp, and the following conditions are met:

[0079] e=(N * pi * d 2 / 4) / (pi * D 2 / 4) (I);

[0080] dp=h (A * vis * u + B * den * u 2 ) (II);

[0081] Wherein, N is the number of the airflow through hole 10a; d is the diameter of the airflow through hole 10a, in mm; D is the diameter of the plate member 10, in mm; h is the length of the regenerative device 100 in the axial direction, in mm; A and B are experimental calibration coefficients; vis is the gas viscosity of the gas passing through the regenerative device 100, in m 2 / s; den is the density of the gas passing through the regenerative device 100, in kg / m 3 ; u is the gas velocity, in m / s.

[0082] It should be noted that the values of A and B in the above formula can be obtained according to the Hazen-Dupuit-Darcy type equation (a type of Darcy equation), and the experimental test is carried out according to the fluid properties and fitted into the corresponding experimental correlation formula in the above manner. The specific test method is the same as that of the porous medium, demister and the like. The compressed gas with different speeds / volume flow rates is introduced, and the pressure difference / flow difference between the two ends of the filled pipe section is detected, and then the experimental calibration coefficients A and B can be obtained.

[0083] In the first arrangement of the gas flow through holes 10a, the length of the regenerator 100 in the axial direction can be determined according to the measured experimental calibration coefficients A and B, the gas viscosity vis, the gas density den, and the gas velocity u of the gas flowing through the gas flow channel 10d, and the desired pressure drop dp (in Pa / mm).

[0084] According to the first formula, the diameter D of the plate 10 and the diameter d of the gas flow through holes 10a and the number N of the gas flow through holes 10a can be calculated according to the desired porosity e, so that the required regenerator 100 can be designed.

[0085] In some embodiments of the present application, as shown in Figure 6 The gas flow through holes 10a are arranged in multiple numbers around the circumferential direction of the plate 10 and form an annular structure 30, and the annular structure 30 is arranged in multiple numbers along the radial direction of the plate 10.

[0086] It can be understood that the above technical solution can obtain another arrangement of the gas flow through holes 10a on the plate 10 (which can be referred to as the second arrangement of the gas flow through holes 10a), and this arrangement can also achieve a dense distribution of the gas flow through holes 10a and is also beneficial to increase the porosity of the regenerator 100.

[0087] In some embodiments of the present application, the porosity of the regenerator 100 is e, and satisfies:

[0088] e = M * πd 2 / (πD 2 / 4) (III).

[0089]

[0090] D * sin(theta) >= 4 * beta (V).

[0091] Wherein, d is the diameter of the gas flow through hole 10a, unit: mm; D is the diameter of the plate 10, unit: mm; M is the number of the gas flow through holes 10a of each plate 10; r i is the radius of the i-th annular structure 30 from the center of the plate 10, unit: mm; theta is the included angle of any two adjacent rows of gas flow through holes 10a arranged along the radial direction of the plate 10, unit: °; beta is the spacing of any two adjacent annular structures 30 in the radial direction of the plate 10, unit: mm.

[0092] In the second arrangement of the gas flow through holes 10a, the diameter D of the plate 10 and the diameter d of the gas flow through holes 10a that meet the desired porosity e can be calculated by the above formula (three), formula (four) and formula (five), and the number of annular structures 30 is obtained.

[0093] In some embodiments of the present application, the diameter of the gas flow through holes 10a is d, and the porosity of the regenerative device 100 is e, wherein d≥0.1mm, and e≥0.8.

[0094] That is, the diameter of the gas flow through holes 10a can be, but is not limited to, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, etc., and the porosity e of the regenerative device 100 can be, but is not limited to, 0.8, 0.82, 0.84, 0.86, 0.88, 0.9, 0.92, 0.94, 0.95, etc.

[0095] It can be understood that no matter whether the gas flow through holes 10a of the plate 10 adopt the first arrangement or the second arrangement, the diameter d of the gas flow through holes 10a and the porosity e of the regenerative device 100 can be controlled within the above range, so that the regenerative device 100 with balanced economy and performance can be obtained.

[0096] In some embodiments of the present application, as shown in Figure 6 and Figure 7 , the plate 10 is provided with a positioning protrusion 10b at one end in the axial direction and a plurality of positioning recesses 10c at the other end, and the positioning protrusion 10b of one of any two adjacent plates 10 is selectively matched with one of the plurality of positioning recesses 10c of the other plate 10.

[0097] It can be understood that the positioning protrusion 10b and the positioning recess 10c are matched with each other, which can improve the installation position accuracy between the two adjacent plates 10, improve the installation convenience of the plates 10, and facilitate the alignment of the gas flow through holes 10a of the two adjacent plates 10 according to the expected position, and improve the reliability of the gas flow channel 10d.

[0098] Secondly, the positioning protrusion 10b of each plate 10 can also be selectively matched with one of the plurality of positioning recesses 10c of another plate 10, so that the rotation angle of the two adjacent plates 10 can be adjusted as needed, so that only part of the plurality of gas flow through holes 10a of the plurality of plates 10 can form the gas flow channel 10d, so that the number and porosity of the gas flow channel 10d of the regenerative device 100 as a whole can be adjusted, and the pressure loss and axial thermal resistance of the gas passing through can be adjusted, and the regenerative efficiency can be adjusted to meet different use requirements.

[0099] Exemplarily, in each plate 10, among the plurality of positioning recesses 10c arranged in the circumferential direction, the included angle of any two adjacent positioning recesses 10c is alpha, and the relationship between the porosity e calculated according to the formula (three), the formula (four) and the formula (five) above and the porosity e2 adjusted by rotating N included angles alpha is: e2 = e*(1-sin(N*alpha)).

[0100] In some embodiments of the present application, as shown in Figure 1 and Figure 8 , the plurality of airflow through holes 10a of each plate 10 are strip-shaped holes and are arranged at intervals in the first direction, and each airflow through hole 10a extends in the second direction, which is perpendicular to the first direction.

[0101] Referring to Figure 1 and Figure 8 , the first direction is the up-down direction in the figure, and the second direction is the left-right direction in the figure. Among them, the plate 10 can be a circular plate or a rectangular plate.

[0102] It can be understood that the third arrangement of the plate 10 and the airflow through hole 10a can be obtained by using the above technical scheme. By using this structure, the shape of the heat recovery device 100 and the shape of the airflow through hole 10a are relatively conventional, which is convenient for processing and manufacturing, and can provide more design options to meet different needs.

[0103] In some embodiments of the present application, the porosity of the heat recovery device 100 is e, and satisfies:

[0104] e = h1*(h-h2*M) / h2 (six);

[0105] Wherein, h is the length of the heat recovery device 100 in the axial direction, with the unit of mm; h1 is the width dimension of the airflow through hole 10a, with the unit of mm; h2 is the gap between the two ends of the plate 10 and the adjacent airflow through hole 10a in the width direction of the airflow through hole 10a, with the unit of mm; M is the number of airflow through holes 10a.

[0106] It can be understood that in the third arrangement of the airflow through hole 10a, the design of the airflow through hole 10a on the plate 10 that meets the expected porosity e can be obtained by formula (six), so as to obtain the desired heat recovery device 100.

[0107] In some embodiments of the present application, as shown in Figures 9 to 11 , among the plurality of plates 10, the airflow through holes 10a of any two adjacent plates 10 can be staggered and partially overlapped.

[0108] Referring to Figure 2The plurality of plate members 10 are stacked in the illustrated assembly manner, the cross-sectional shape of the airflow channel 10d is the largest, and the porosity can reach the maximum value.

[0109] In the above embodiment, with reference to Figure 8 , the plate member 10 is a square plate, and in each plate member 10, the distance between one of the two airflow vias 10a located at the two ends in the up-down direction and the edge of the plate member 10 is La, and the distance between the other and the edge of the plate member 10 is Lc, at this time, the two adjacent plate members 10 can be installed at 180 degrees to each other, so that the airflow vias 10a between the two adjacent plate members 10 only partially overlap, and the effective width of the airflow channel 10d is h3.

[0110] In the example of Figure 9 , the shielding height of the airflow vias 10a of the two adjacent plate members 10 in the up-down direction is Lc-La, and the design should satisfy Lc-La≤0.5*h1. The overall porosity e3=e*(1-(Lc-La) / h1), which is preferably set to be between 0.7-0.8, wherein Lc is in mm, La is in mm, and h1 is in mm.

[0111] Further, with reference to Figure 10 and Figure 11 , the above embodiment can also be that the two adjacent plate members 10 are installed at 90 degrees, so that the cross section of the airflow channel 10d is a square, and in this example, the overall porosity e4=e*(h1 / (h2)), h1 is in mm, and h2 is in mm.

[0112] It can be understood that by using the above technical solution, the overall porosity of the regenerative device 100 is adjustable, the axial heat conduction is low under the same heat capacity condition, the flow channel is relatively uniform, and the gas pressure resistance is also relatively small. Moreover, the above scheme makes the regenerative device 100 applicable to the design of a complex flow structure, and can further reduce the volume of the regenerative device 100, and the same type of plate member 10 can be stacked and installed to complete regenerative devices 100 of different models.

[0113] In some embodiments of the present application, as shown in Figure 4 , Figure 6 and Figure 8 , the plate member 10 is provided with a mounting hole 10e, and the mounting holes 10e of the plurality of plate members 10 are correspondingly arranged; the regenerative device 100 comprises a fastener, and the fastener is arranged in the corresponding mounting holes 10e of the plurality of plate members 10.

[0114] It can be understood that the mounting hole 10e of each plate member 10 can be provided in plurality, and the fastener can be but not limited to a bolt, a fixing pin, a connecting rod and the like, for example, the fastener can be a bolt, thereby being capable of fixing the stacked plurality of plate members 10 together, and improving the reliability of the overall structure of the heat recovery device 100.

[0115] Hereinafter, specific embodiments of the present application will be described with reference to the accompanying drawings.

[0116] Embodiment 1

[0117] As shown in the drawings, Figures 1 to 3 A heat recovery device 100 has an axial direction extending in a front-rear direction, and includes a plurality of plate members 10 stacked in the front-rear direction, each plate member 10 being a square plate and provided with a plurality of airflow through holes 10a, each airflow through hole 10a being a strip hole extending in a left-right direction, and the plurality of airflow through holes 10a being spaced apart in an up-down direction, the airflow through holes 10a of the plurality of plate members 10 being correspondingly arranged to form an airflow passage 10d extending in the axial direction, and a heat insulation layer 20 of ceramic material being sprayed on each plate member 10 at both ends in the axial direction.

[0118] Embodiment 2

[0119] As shown in the drawings, Figure 4 and Figure 5 The structure of the heat recovery device 100 of Embodiment 2 is substantially the same as that of the heat recovery device 100 of Embodiment 1, except that the plate member 10 is a circular plate, the airflow through hole 10a is a circular hole, and on each plate member 10, the airflow through holes 10a are arranged in multiple groups in the up-down direction, and each group of airflow through holes 10a is arranged in multiple in the left-right direction.

[0120] Embodiment 3

[0121] As shown in the drawings, Figure 6 The structure of the heat recovery device 100 of Embodiment 3 is substantially the same as that of the heat recovery device 100 of Embodiment 1, except that the plate member 10 is a circular plate, the airflow through hole 10a is a circular hole, and on each plate member 10, the airflow through holes 10a are arranged in multiple around the circumferential direction of the plate member 10, and form an annular structure 30, and the annular structure 30 is arranged in multiple in the radial direction of the plate member 10.

[0122] A Stirling machine according to an embodiment of the present application comprises the heat recovery device 100 of any of the preceding embodiments.

[0123] The Stirling machine according to an embodiment of the present application has a high heat recovery efficiency due to the heat recovery device 100, and therefore the Stirling machine using the heat recovery device 100 can have a high thermal efficiency.

[0124] In the description of the specification, the description of the terms "some embodiments", "optionally", "further", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the description of the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0125] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A regenerative device, characterized by, The heat recovery device has an axial direction, and comprises a plurality of plates stacked along the axial direction, each plate being provided with a plurality of airflow through holes, at least part of the airflow through holes of the plurality of plates being correspondingly arranged to form airflow channels penetrating through in the axial direction, and each plate being provided with a thermal insulation layer at at least one end in the axial direction.

2. The regenerative device of claim 1, wherein The plate and the thermal insulation layer are in an integrated structure, and the thermal insulation layer is a coating covering the plate.

3. The regenerative device of claim 2, wherein The plate is provided with the thermal insulation layer at both ends in the axial direction.

4. The regenerative device of claim 1, wherein The plate and the thermal insulation layer are in a split structure, the thermal insulation layer is a thermal insulation plate, and is arranged between adjacent two plates.

5. The recuperator according to any one of claims 1 to 4, characterized in that In the axial direction, the thickness of the plate is f, and the thickness or sum of thicknesses of the thermal insulation layer between any adjacent two plates is ft, wherein ft≤0.2f.

6. The regenerative device of claim 1, wherein The plate is a circular plate, and the airflow through hole is a circular hole.

7. The regenerative device of claim 6, wherein The airflow through hole is provided with a plurality of rows on the plate, and each row of the airflow through holes is provided with a plurality of airflow through holes.

8. The regenerative device of claim 7, wherein The porosity of the heat recovery device is e, the pressure drop of the airflow channel at both ends in the axial direction is dp, and the following formula is satisfied: e = (N * π * d 2 / 4) / (π * D 2 / 4); dP = h(A*vis*u + B*den*u 2 ); wherein, N is the number of the airflow through holes; d is the diameter of the airflow through hole, in mm; D is the diameter of the plate, in mm; h is the length of the heat recovery device in the axial direction, in mm; A and B are experimental calibration coefficients; vis is the gas viscosity of the gas passing through the recuperator, in m 2 / s; den is the density of the gas passing through the recuperator, in kg / m3 3 ; u is the gas velocity, in m / s.

9. The regenerative device of claim 6, wherein, The airflow through holes are arranged in a plurality of and form an annular structure around the circumferential direction of the plate, and the annular structure is arranged in a plurality of along the radial direction of the plate.

10. The regenerative device of claim 9, wherein, The porosity of the heat recovery device is e, and the following formula is satisfied: e = M * πd 2 (πD 2 / 4) D*sin(theta)≥4*beta; wherein, d is the diameter of the airflow through hole, in mm; D is the diameter of the plate, in mm; M is the number of the airflow through holes of each plate; r i Ri is the radius of the i-th ring structure from the center of the plate piece, in mm; theta is the included angle of any adjacent two rows of the airflow through holes arranged along the radial direction of the plate, in °; beta is the spacing of any adjacent two annular structures in the radial direction of the plate, in mm.

11. The recuperator according to any one of claims 6 to 10, characterized in that The diameter of the airflow through hole is d, and the porosity of the heat recovery device is e, wherein d≥0.1 mm and e≥0.

8.

12. The regenerative device of claim 9 or 10, wherein, The plate is provided with a positioning protrusion at one end in the axial direction, and is provided with a plurality of positioning recesses at the other end, and the positioning protrusion of one of any adjacent two plates is selectively matched with one of the plurality of positioning recesses of the other plate.

13. The regenerative device of claim 1, wherein, The plurality of airflow through holes of each plate are strip-shaped holes and are arranged at intervals in a first direction, and each airflow through hole extends along a second direction perpendicular to the first direction.

14. The regenerative device of claim 13, wherein, The porosity of the heat recovery device is e, and the following formula is satisfied: e=h1*(h-h2*M) / h2; wherein, h is the length of the heat recovery device in the axial direction, in mm; h1 is the width dimension of the airflow through hole, in mm; h2 is the gap between the two ends of the plate member and the adjacent gas flow through hole in the width direction of the gas flow through hole, in mm; M is the number of the gas flow through holes.

15. The regenerative device of claim 14, wherein, In the plurality of plate members, the gas flow through holes of any two adjacent plate members can be staggered and partially overlapped.

16. A Stirling machine characterised in that, A heat recovery device comprising any one of claims 1 to 15.

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