Heat exchanger of recuperative heat engine and recuperative heat engine

Abstract

The present invention relates to the field of heat exchange technology, and provides a heat exchanger of a regenerative heat engine and a regenerative heat engine, wherein the heat exchanger of the regenerative heat engine comprises: a shell, wherein a containing chamber is formed inside the shell; a heat exchange component is arranged inside the containing chamber; the heat exchange component comprises a plurality of heat exchange tubes nested with each other; a fluid channel for the circulation of a heat transfer fluid is formed between two adjacent heat exchange tubes; and a gas channel for the circulation of a gas working medium is arranged inside the tube wall of each heat exchange tube. The heat exchanger of the regenerative heat engine provided by the present invention has a simple structure and is easy to manufacture, and realizes efficient heat exchange between an external heat transfer fluid and an internal working medium of the regenerative heat engine, has good sealing performance, high safety performance, and long service life. The heat exchanger is an integrated structure without redundant parts, and the interlayer flow channel of the heat transfer fluid has a long flow path, and the pressure drop loss of the heat transfer fluid is small, which effectively improves the heat exchange efficiency of the heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange, and in particular to a heat exchanger of a regenerative heat engine and the regenerative heat engine. Background Art

[0002] Regenerative heat engine is an important external combustion heat engine, mainly including Stirling heat engine, thermoacoustic heat engine and VM (Vuilleumier) heat engine and other technical forms. Regenerative heat engine builds working temperature zone through intervening high and low temperature heat exchanger, transfers external heat to internal high pressure gas working medium, and uses core component - regenerator to realize heat-work conversion, thereby converting external heat into mechanical energy. Based on the characteristics of external combustion and high pressure sealing of regenerative heat engine, it has important application prospects in the fields of solar thermal power generation, combined heat, cooling and power and space power supply.

[0003] The basic structure of the recuperator mainly includes a heat-work conversion unit and a phase adjustment unit, in which the expeller is the phase adjustment unit. The heat-work conversion unit, as the core component, mainly includes a high-temperature heat exchanger, a regenerator and a low-temperature heat exchanger in a sandwich assembly structure. At present, the high-temperature heat exchanger and the low-temperature heat exchanger of the recuperator generally adopt a partition structure, mainly using shell and tube and plate-fin structures. The tube side of the shell and tube heat exchanger carries the heat engine gas working medium, while the shell side carries the external heat transfer fluid; the plate-fin heat exchanger generally adopts an inner and outer fin structure, the inner fin exchanges heat with the heat engine gas working medium, and the outer fin exchanges heat with the heat transfer fluid. In principle, both heat exchanger structures can be used for high and low temperature heat exchangers of the recuperator, but the heat exchanger structure selected in actual application depends on the heat exchange temperature, heat exchange power and the characteristics of the heat transfer fluid. Commonly, the plate-fin type is used at low heat exchange, and the shell-tube type is used at high heat exchange. For commonly used heat exchange fluids, such as water, thermal oil and molten salt, both heat exchanger structures are applicable. However, for special heat exchange fluids, such as heat transfer fluids, shell and tube heat exchangers have higher safety risks due to more welding points. Plate-fin heat exchangers are safer, but cannot meet the requirements of efficient heat exchange under high heat exchange conditions.

[0004] The present invention is proposed in view of this. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a heat exchanger for a recuperative heat engine.

[0006] The present invention also provides a regenerative heat engine.

[0007] A heat exchanger of a regenerative heat engine according to an embodiment of a first aspect of the present invention comprises:

[0008] A housing, wherein a receiving chamber is formed inside the housing;

[0009] A heat exchange component is arranged inside the accommodating chamber;

[0010] The heat exchange assembly includes a plurality of heat exchange cylinders which are nested with each other;

[0011] A fluid channel for circulating a heat transfer fluid is formed between two adjacent heat exchange cylinders;

[0012] A gas channel for the flow of gaseous working medium is arranged in the wall of each heat exchange cylinder.

[0013] According to one embodiment of the present invention, the top and bottom of each heat exchange tube are respectively welded with the top and bottom of the adjacent heat exchange tube to form an integrated structure;

[0014] The two heat exchange cylinders are welded to form an integral top and bottom, and the cylinder walls of the two adjacent heat exchange cylinders facing each other surround each other to form the fluid channel for the heat transfer fluid to flow.

[0015] Specifically, after every two layers of nested heat exchange tubes are nested, the upper and lower parts of adjacent heat exchange tubes are welded to form an integrated structure, and the cylindrical hollow area formed between the two coaxial metal tubes is the fluid channel for the heat transfer fluid to flow.

[0016] According to one embodiment of the present invention, the wall thickness of the middle portion of the heat exchange cylinder wall is smaller than the wall thickness of the top and bottom of the heat exchange cylinder wall.

[0017] Specifically, the wall of the heat exchange tube is arranged in the axial direction so that the middle wall thickness is smaller than the wall thickness at both ends. This arrangement facilitates the formation of a fluid channel between two adjacent heat exchange tubes.

[0018] According to an embodiment of the present invention, the heat exchange tube is mainly made of stainless steel or high-temperature alloy steel.

[0019] Specifically, the material of the heat exchange tube is set to stainless steel or high-temperature alloy steel that is incompatible with the heat transfer fluid, so that the fluid channel formed by the heat exchange tube can realize heat exchange of special heat exchange fluid.

[0020] In one embodiment, the heat exchange tube is an I-shaped coaxial metal tube that is thick at the upper and lower ends and thin in the middle. After every two layers of heat exchange tubes are nested, the two heat exchange tubes are connected at the thick parts at the upper and lower ends by high-temperature brazing, argon arc welding or electron beam welding.

[0021] According to one embodiment of the present invention, a plurality of through holes penetrating the heat exchange cylinder wall are evenly arranged on the end surface of the heat exchange cylinder wall;

[0022] The trajectory of the through hole in the wall of the heat exchange cylinder forms the gas channel for the flow of the gas working medium.

[0023] Specifically, by arranging a plurality of evenly distributed through holes along the axial direction on the two end surfaces of the heat exchange tube, a gas passage is provided for the gas working medium to enter and exit the heat exchanger, thereby increasing the heat exchange area between the gas working medium and the heat transfer fluid.

[0024] According to one embodiment of the present invention, the heat transfer fluid comprises at least liquid metal.

[0025] It should be noted that the heat transfer fluid may be any fluid with good thermal conductivity including liquid metal.

[0026] Specifically, heat-conducting fluids such as liquid metal can achieve heat exchange in the heat exchanger provided by the present invention, while ensuring safe and stable operation of the heat exchanger and achieving the requirements of efficient heat exchange.

[0027] According to one embodiment of the present invention, a fluid inlet and a fluid outlet are provided on the housing;

[0028] The heat transfer fluid flows into the fluid channel from the fluid inlet, exchanges heat with the gaseous working medium in the gas channel, and then flows out from the fluid outlet.

[0029] Specifically, the fluid inlet and the fluid outlet are respectively welded to the shell, and the fluid inlet and the fluid outlet are collinear in the axial direction. The fluid inlet, the fluid channel and the fluid outlet form a channel for the heat transfer fluid to enter and exit the heat exchanger, and the fluid channels are evenly distributed in multiple layers, which can fully and evenly exchange heat with the gas working medium in the gas channel, meeting the needs of efficient heat exchange.

[0030] According to one embodiment of the present invention, the shell is cylindrical, with an end cover at one end and a group of heat exchange components disposed inside;

[0031] Wherein, the axial direction of the heat exchange tube is arranged in the same direction as the axial direction of the shell;

[0032] The fluid inlet is provided with an inlet channel communicating with the fluid channels of each layer;

[0033] An outlet channel communicating with the fluid channels of each layer is arranged inside the fluid outlet.

[0034] Specifically, a single-sided heat exchange implementation is provided, in which an end cover is provided on one side and an open side is provided, and the gas working medium enters the shell from the open part through a conveying device, and then the gas working medium enters the gas channel to achieve heat exchange with the heat transfer fluid in the fluid channel.

[0035] According to one embodiment of the present invention, the shell is cylindrical, and at least two groups of the heat exchange components are arranged at intervals inside;

[0036] Wherein, the axial direction of the heat exchange tube is arranged in the same direction as the axial direction of the shell;

[0037] The fluid inlet is provided with an inlet channel corresponding to each group of the heat exchange components, and the inlet channel is connected to each layer of the fluid channel in the corresponding heat exchange component;

[0038] An outlet channel corresponding to each group of the heat exchange components is arranged inside the fluid outlet, and the outlet channel is in the corresponding heat exchange component and is connected to the fluid channel of each layer.

[0039] Specifically, an implementation method of double-sided heat exchange is provided, in which two groups of heat exchange components are arranged in a shell, and both sides of the shell are opened along the axial direction. The gas working medium enters the shell from the open part through a conveying device, and then the gas working medium enters the gas channel in each group of heat exchange components to achieve heat exchange with the heat transfer fluid in the fluid channel.

[0040] A recuperative heat engine according to an embodiment of the second aspect of the present invention includes the heat exchanger of the recuperative heat engine described above.

[0041] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: the present invention has a simple structure and is easy to manufacture, and realizes efficient heat exchange between the external heat transfer fluid and the internal working fluid of the heat recovery heat engine, has good sealing, high safety performance, and long service life. The heat exchanger is an integrated structure without redundant parts, the interlayer flow channel of the heat transfer fluid is long, and the pressure drop loss of the heat transfer fluid is small, which effectively improves the heat exchange efficiency of the heat exchanger.

[0042] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 is a first schematic diagram of the overall assembly relationship of a regenerative heat engine heat exchanger provided by an embodiment of the present invention;

[0045] Figure 2 is a second schematic diagram of the overall assembly relationship of the regenerative heat exchanger provided by an embodiment of the present invention;

[0046] Figure 3is a third schematic diagram of the overall assembly relationship of the regenerative heat exchanger provided by an embodiment of the present invention;

[0047] Figure 4 is a fourth schematic diagram of the overall assembly relationship of the regenerative heat engine heat exchanger provided by an embodiment of the present invention;

[0048] Figure 5 The overall assembly relationship of the heat exchanger of the heat recovery type heat engine provided by the embodiment of the present invention is Figure 4 A magnified schematic diagram of part A in FIG.

[0049] Figure 6 is a first schematic diagram of the overall assembly relationship of a regenerative heat engine heat exchanger provided by an embodiment of the present invention;

[0050] Figure 7 is a second schematic diagram of the overall assembly relationship of the regenerative heat exchanger provided by an embodiment of the present invention;

[0051] Figure 8 is a third schematic diagram of the overall assembly relationship of the regenerative heat exchanger provided by an embodiment of the present invention;

[0052] Fig. 9 The overall assembly relationship of the heat exchanger of the heat recovery type heat engine provided by the embodiment of the present invention is Figure 8 An enlarged schematic diagram of part B in FIG.

[0053] Reference numerals:

[0054] 1: housing; 101: fluid inlet; 102: fluid outlet; 103: end cover; 104: inlet channel; 105: outlet channel;

[0055] 2: Heat exchange cylinder;

[0056] 3: Through hole.

[0057] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0060] Figures 1 to 5 1 is an enlarged schematic diagram of the first, second, third, fourth and A parts of the overall assembly relationship of the heat exchanger of the recuperative heat engine provided by the embodiment of the present invention. Figures 1 to 5 As can be seen from the figure, the heat exchanger provided by the present invention comprises a shell 1 and an end cover 103 arranged at one end of the shell 1, and the other end of the shell 1 is open. The shell 1 is provided with a fluid inlet 101 and a fluid outlet 102. As a preferred technical solution, the fluid inlet 101 and the fluid outlet 102 are symmetrically arranged on both sides of the shell 1.

[0061] Furthermore, a heat exchange component is arranged inside the shell 1, and the heat exchange component includes a plurality of heat exchange tubes 2 which are nested with each other, a fluid channel is formed between every two heat exchange tubes 2, and a gas channel for the flow of gas working medium is arranged on the tube wall of each heat exchange tube 2. The heat transfer fluid enters the fluid channel from the fluid inlet 101, and after sufficient heat exchange with the gas working medium in the gas channel in the fluid channel, it flows out from the fluid outlet 102.

[0062] Furthermore, the fluid inlet 101 and the fluid outlet 102 on the shell 1 are connected to the fluid channel of each layer, that is, except for the innermost heat exchange tube 2, the heat exchange tubes 2 at other positions are provided with notches corresponding to the fluid inlet 101 and the fluid outlet 102, and the notch forms an inlet channel 104 on the side of the fluid inlet 101 of the shell 1, and forms an outlet channel 105 on the side of the fluid outlet 102.

[0063] Furthermore, a through hole 3 penetrating the top and the bottom is opened on the wall of the heat exchange tube 2 , and the through hole 3 forms a gas channel in the wall of the heat exchange tube 2 .

[0064] Further, from Figure 5 It can be seen from the enlarged schematic diagram of part A that each heat exchange tube 2 is an I-shaped structure with a wide top and bottom and a narrow middle. Two adjacent heat exchange tubes 2 are nested and welded together.

[0065] Figures 6 to 91 is an enlarged schematic diagram of the first, second, third and B parts of the overall assembly relationship of the regenerative heat exchanger provided by the embodiment of the present invention. Figures 6 to 9 As can be seen, the heat exchanger provided by Benfu to you includes a shell 1 and two sets of heat exchange components arranged inside the shell 1. The shell 1 is provided with a fluid inlet 101 and a fluid outlet 102. As a preferred technical solution, the fluid inlet 101 and the fluid outlet 102 are symmetrically arranged on both sides of the shell 1.

[0066] Furthermore, each group of heat exchange components includes a plurality of heat exchange tubes 2 nested with each other, a fluid channel is formed between every two heat exchange tubes 2, and a gas channel for the flow of gas working medium is provided on the tube wall of each heat exchange tube 2. The heat transfer fluid enters the fluid channel from the fluid inlet 101, and after sufficient heat exchange with the gas working medium in the gas channel in the fluid channel, it flows out from the fluid outlet 102.

[0067] Furthermore, the fluid inlet 101 and the fluid outlet 102 on the shell 1 are connected to the fluid channel of each layer, that is, except for the innermost heat exchange tube 2, the heat exchange tubes 2 at other positions are provided with notches corresponding to the fluid inlet 101 and the fluid outlet 102, and the notch forms an inlet channel 104 on the side of the fluid inlet 101 of the shell 1, and forms an outlet channel 105 on the side of the fluid outlet 102.

[0068] As a preferred technical solution, Figure 7 As shown, each fluid inlet 101 corresponds to a different heat exchange component, forming an independent inlet channel 104 , and similarly each fluid outlet 102 corresponds to a different heat exchange component, forming an independent outlet channel 105 .

[0069] Furthermore, a through hole 3 penetrating the top and the bottom is opened on the wall of the heat exchange tube 2 , and the through hole 3 forms a gas channel in the wall of the heat exchange tube 2 .

[0070] Further, from Fig. 9 It can be seen from the enlarged schematic diagram of part B that each heat exchange tube 2 in each heat exchange assembly is an I-shaped structure with a wide top and bottom and a narrow middle. Two adjacent heat exchange tubes 2 are nested and welded together.

[0071] In general, the present invention has a simple structure and is easy to manufacture. It realizes efficient heat exchange between the external heat transfer fluid and the internal working fluid of the heat recovery heat engine. It has good sealing, high safety performance, and long service life. The heat exchanger is an integrated structure without redundant parts. The interlayer flow channel of the heat transfer fluid is long, and the pressure drop loss of the heat transfer fluid is small, which effectively improves the heat exchange efficiency of the heat exchanger.

[0072] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0073] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0074] In one embodiment, if Figures 1 to 5 As shown, this embodiment provides a heat exchanger for a heat recovery heat engine, including: a shell 1, a containing chamber is formed inside the shell 1; a heat exchange component is arranged inside the containing chamber; the heat exchange component includes a plurality of heat exchange tubes 2 nested with each other; a fluid channel for the circulation of heat transfer fluid is formed between two adjacent heat exchange tubes 2; a gas channel for the circulation of gas working medium is arranged in the tube wall of each heat exchange tube 2.

[0075] In one implementation of this embodiment, Figures 2 to 4 As shown, the top and bottom of each heat exchange tube 2 are respectively welded with the top and bottom of the adjacent heat exchange tube 2 to form an integral structure; the two heat exchange tubes 2 are welded to form an integral top and bottom, and the tube walls of the two adjacent heat exchange tubes facing each other surround each other to form a fluid channel for the circulation of heat transfer fluid.

[0076] Specifically, after every two layers of nested heat exchange tubes 2 are nested, the upper and lower parts of adjacent heat exchange tubes 2 are welded to form an integrated structure, and the cylindrical hollow area formed between the two coaxial metal tubes is the fluid channel for the heat transfer fluid to flow.

[0077] In one implementation of this embodiment, Figure 4 and Figure 5 As shown, the wall thickness of the middle portion of the heat exchange tube 2 is smaller than the wall thickness of the top and bottom of the heat exchange tube 2.

[0078] Specifically, the wall of the heat exchange tube 2 is arranged in the axial direction so that the middle wall thickness is smaller than the wall thickness at both ends. This arrangement facilitates the formation of a fluid channel between two adjacent heat exchange tubes 2 .

[0079] In one implementation of this embodiment, the heat exchange tube 2 is mainly made of stainless steel or high-temperature alloy steel.

[0080] Specifically, the material of the heat exchange tube 2 is set to stainless steel or high-temperature alloy steel that is incompatible with the heat transfer fluid, so that the fluid channel formed by the heat exchange tube 2 can achieve heat exchange of special heat exchange fluid.

[0081] In one example of this embodiment, Figure 4 and Figure 5 As shown, the heat exchange tube 2 is an I-shaped coaxial metal tube that is thick at the upper and lower ends and thin in the middle. After every two layers of heat exchange tubes 2 are nested, the two heat exchange tubes 2 are connected at the thick parts at the upper and lower ends by high-temperature brazing, argon arc welding or electron beam welding.

[0082] In one implementation of this embodiment, Figures 2 to 5 As shown, a plurality of through holes 3 penetrating the wall of the heat exchange tube 2 are evenly arranged on the end surface of the wall of the heat exchange tube 2; the tracks of the through holes 3 in the wall of the heat exchange tube 2 form a gas channel for the flow of the gas working medium.

[0083] Specifically, by arranging a plurality of evenly distributed through holes 3 along the axial direction on the two end surfaces of the heat exchange tube 2, a gas passage is provided for the gas working medium to enter and exit the heat exchanger, thereby increasing the heat exchange area between the gas working medium and the heat transfer fluid.

[0084] It should be noted that each layer of the coaxial heat exchange tube 2 has uniformly opened through holes 3 in the axial direction. The diameter of the through hole 3 is not greater than the wall thickness of the coaxial heat exchange tube 2. The through hole 3 is the fluid that exchanges heat with the heat transfer fluid in the heat exchanger. The gas working medium can be, but is not limited to, the working medium gas of the recuperative heat engine such as helium and argon, and the working pressure is between 3 and 20 MPa.

[0085] In one implementation of this embodiment, the heat transfer fluid comprises at least liquid metal.

[0086] It should be noted that the heat transfer fluid can be any fluid with good thermal conductivity, including liquid metal.

[0087] Specifically, heat-conducting fluids such as liquid metal can achieve heat exchange in the heat exchanger provided by the present invention, while ensuring safe and stable operation of the heat exchanger and achieving the requirements of efficient heat exchange.

[0088] It should be noted that the heat transfer fluid includes but is not limited to liquid metal, water, heat transfer oil, molten salt, etc., and the working temperature of the heat transfer fluid does not exceed 800°C.

[0089] In one implementation of this embodiment, Figures 3 to 5As shown, a fluid inlet 101 and a fluid outlet 102 are provided on the shell 1; the heat transfer fluid flows into the fluid channel from the fluid inlet 101, exchanges heat with the gaseous working medium in the gas channel, and then flows out from the fluid outlet 102.

[0090] Specifically, the fluid inlet 101 and the fluid outlet 102 are respectively welded to the shell 1, and the fluid inlet 101 and the fluid outlet 102 are collinear in the axial direction. The fluid inlet 101, the fluid channel and the fluid outlet 102 form a channel for the heat transfer fluid to enter and exit the heat exchanger, and the fluid channel is evenly distributed in multiple layers, which can fully and evenly exchange heat with the gas working medium in the gas channel, meeting the needs of efficient heat exchange.

[0091] In one implementation of this embodiment, Figure 1 As shown, the shell 1 is arranged in a cylindrical shape, with an end cover 103 at one end, and a group of heat exchange components arranged inside; wherein the axial direction of the heat exchange cylinder 2 is arranged in the same direction as the axial direction of the shell 1; an inlet channel 104 connecting each layer of fluid channels is arranged inside the fluid inlet 101; and an outlet channel 105 connecting each layer of fluid channels is arranged inside the fluid outlet 102.

[0092] Specifically, a single-sided heat exchange implementation is provided, in which an end cover 103 is provided on one side and an open side is provided, and the gas working medium enters the shell 1 from the open part through a conveying device, and then the gas working medium enters the gas channel to achieve heat exchange with the heat transfer fluid in the fluid channel.

[0093] In one embodiment, if Figures 6 to 9 As shown, this embodiment provides a heat exchanger for a heat recovery heat engine, including: a shell 1, a containing chamber is formed inside the shell 1; a heat exchange component is arranged inside the containing chamber; the heat exchange component includes a plurality of heat exchange tubes 2 nested with each other; a fluid channel for the circulation of heat transfer fluid is formed between two adjacent heat exchange tubes 2; a gas channel for the circulation of gas working medium is arranged in the tube wall of each heat exchange tube 2.

[0094] In one implementation of this embodiment, Figures 6 to 8 As shown, the top and bottom of each heat exchange tube 2 are respectively welded with the top and bottom of the adjacent heat exchange tube 2 to form an integral structure; the two heat exchange tubes 2 are welded to form an integral top and bottom, and the tube walls of the two adjacent heat exchange tubes facing each other surround each other to form a fluid channel for the circulation of heat transfer fluid.

[0095] Specifically, after every two layers of heat exchange tubes 2 are nested, the upper and lower parts of adjacent heat exchange tubes 2 are welded to form an integrated structure, and the cylindrical hollow area formed between the two coaxial metal tubes is the fluid channel for the heat transfer fluid to flow.

[0096] In one implementation of this embodiment, Figure 8 and Fig. 9 As shown, the wall thickness of the middle portion of the heat exchange tube 2 is smaller than the wall thickness of the top and bottom of the heat exchange tube 2.

[0097] Specifically, the wall of the heat exchange tube 2 is arranged in the axial direction so that the middle wall thickness is smaller than the wall thickness at both ends. This arrangement facilitates the formation of a fluid channel between two adjacent heat exchange tubes 2 .

[0098] In one implementation of this embodiment, the heat exchange tube 2 is mainly made of stainless steel or high-temperature alloy steel.

[0099] Specifically, the material of the heat exchange tube 2 is set to stainless steel or high-temperature alloy steel that is incompatible with the heat transfer fluid, so that the fluid channel formed by the heat exchange tube 2 can achieve heat exchange of special heat exchange fluid.

[0100] In one example of this embodiment, Figure 8 and Fig. 9 As shown, the heat exchange tube 2 is an I-shaped coaxial metal tube that is thick at the upper and lower ends and thin in the middle. After every two layers of heat exchange tubes 2 are nested, the two heat exchange tubes 2 are connected at the thick parts at the upper and lower ends by high-temperature brazing, argon arc welding or electron beam welding.

[0101] In one implementation of this embodiment, Figures 6 to 9 As shown, a plurality of through holes 3 penetrating the wall of the heat exchange tube 2 are evenly arranged on the end surface of the wall of the heat exchange tube 2; the tracks of the through holes 3 in the wall of the heat exchange tube 2 form a gas channel for the flow of the gas working medium.

[0102] Specifically, by arranging a plurality of evenly distributed through holes 3 along the axial direction on the two end surfaces of the heat exchange tube 2, a gas passage is provided for the gas working medium to enter and exit the heat exchanger, thereby increasing the heat exchange area between the gas working medium and the heat transfer fluid.

[0103] It should be noted that each layer of the coaxial heat exchange tube 2 has uniformly opened through holes 3 in the axial direction. The diameter of the through hole 3 is not greater than the wall thickness of the coaxial heat exchange tube 2. The through hole 3 is the fluid that exchanges heat with the heat transfer fluid in the heat exchanger. The gas working medium can be, but is not limited to, the working medium gas of the recuperative heat engine such as helium and argon, and the working pressure is between 3 and 20 MPa.

[0104] In one implementation of this embodiment, the heat transfer fluid comprises at least liquid metal.

[0105] Specifically, liquid metal can realize heat exchange in the heat exchanger provided by the present invention, while ensuring the safe and stable operation of the heat exchanger and achieving the requirements of efficient heat exchange.

[0106] It should be noted that the heat transfer fluid includes but is not limited to liquid metal, water, heat transfer oil, molten salt, etc., and the working temperature of the heat transfer fluid does not exceed 800°C.

[0107] In one implementation of this embodiment, Figures 7 to 9 As shown, a fluid inlet 101 and a fluid outlet 102 are provided on the shell 1; the heat transfer fluid flows into the fluid channel from the fluid inlet 101, exchanges heat with the gaseous working medium in the gas channel, and then flows out from the fluid outlet 102.

[0108] Specifically, the fluid inlet 101 and the fluid outlet 102 are respectively welded to the shell 1, and the fluid inlet 101 and the fluid outlet 102 are collinear in the axial direction. The fluid inlet 101, the fluid channel and the fluid outlet 102 form a channel for the heat transfer fluid to enter and exit the heat exchanger, and the fluid channel is evenly distributed in multiple layers, which can fully and evenly exchange heat with the gas working medium in the gas channel, meeting the needs of efficient heat exchange.

[0109] In one implementation of this embodiment, Figures 6 to 9 As shown, the shell 1 is arranged in a cylindrical shape, and at least two groups of heat exchange components are arranged at intervals inside; wherein the axial direction of the heat exchange cylinder 2 is arranged in the same direction as the axial direction of the shell 1; the fluid inlet 101 is provided with an inlet channel 104 corresponding to each group of heat exchange components, and the inlet channel 104 is in the corresponding heat exchange component and connects each layer of fluid channels; the fluid outlet 102 is provided with an outlet channel 105 corresponding to each group of heat exchange components, and the outlet channel 105 is in the corresponding heat exchange component and connects each layer of fluid channels.

[0110] Specifically, an implementation method of double-sided heat exchange is provided, in which two groups of heat exchange components are arranged in the shell 1, and the shell 1 is opened on both sides along the axial direction. The gas working medium enters the shell 1 from the open part through a conveying device, and then the gas working medium enters the gas channel in each group of heat exchange components to achieve heat exchange with the heat transfer fluid in the fluid channel.

[0111] It should be noted that Figures 1 to 5 The embodiment shown and Figures 6 to 9 The illustrated embodiments can be combined with each other to form other embodiments not shown in the figures. Figures 1 to 5 as well as Figures 6 to 9 This is merely an illustration and does not constitute a strict distinction between the embodiments.

[0112] In one embodiment, a recuperative heat engine is also provided, comprising the heat exchanger of the recuperative heat engine described above.

[0113] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0114] The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A heat exchanger for a regenerative heat engine, characterized in that: include: A housing, wherein a receiving chamber is formed inside the housing; A heat exchange component is arranged inside the accommodating chamber; The heat exchange assembly includes a plurality of heat exchange cylinders which are nested with each other; A fluid channel for the circulation of heat transfer fluid is formed between two adjacent heat exchange cylinders; A gas channel for the flow of gaseous working medium is provided in the wall of each heat exchange cylinder; The top and bottom of each heat exchange tube are respectively welded with the top and bottom of the adjacent heat exchange tube to form an integrated structure; The two heat exchange cylinders are welded to form an integral top and bottom, and the cylinder walls of the two adjacent heat exchange cylinders facing each other surround each other to form the fluid channel for the heat transfer fluid to flow; The wall thickness of the middle part of the heat exchange cylinder wall is smaller than the wall thickness of the top and bottom of the heat exchange cylinder wall; A plurality of through holes penetrating the heat exchange cylinder wall are evenly arranged on the end surface of the heat exchange cylinder wall; The trajectory of the through hole in the wall of the heat exchange cylinder forms the gas channel for the flow of the gas working medium.

2. The heat exchanger of a recuperative heat engine according to claim 1, characterized in that: The heat exchange tube is mainly made of stainless steel or high-temperature alloy steel.

3. The heat exchanger of a recuperative heat engine according to claim 1, characterized in that: The heat transfer fluid comprises at least liquid metal.

4. A heat exchanger for a regenerative heat engine according to any one of claims 1 to 3, characterized in that: The shell is provided with a fluid inlet and a fluid outlet; The heat transfer fluid flows into the fluid channel from the fluid inlet, exchanges heat with the gaseous working medium in the gas channel, and then flows out from the fluid outlet.

5. The heat exchanger of a recuperative heat engine according to claim 4, characterized in that: The shell is cylindrical, with an end cover at one end and a group of heat exchange components arranged inside; Wherein, the axial direction of the heat exchange tube is arranged in the same direction as the axial direction of the shell; The fluid inlet is provided with an inlet channel communicating with the fluid channels of each layer; An outlet channel communicating with the fluid channels of each layer is arranged inside the fluid outlet.

6. The heat exchanger of a recuperative heat engine according to claim 4, characterized in that: The shell is cylindrical, and at least two groups of heat exchange components are arranged inside at intervals; Wherein, the axial direction of the heat exchange tube is arranged in the same direction as the axial direction of the shell; The fluid inlet is provided with an inlet channel corresponding to each group of the heat exchange components, and the inlet channel is connected to each layer of the fluid channel in the corresponding heat exchange component; An outlet channel corresponding to each group of the heat exchange components is arranged inside the fluid outlet, and the outlet channel is in the corresponding heat exchange component and is connected to the fluid channel of each layer.

7. A regenerative heat engine, characterized in that: include: A heat exchanger for a recuperative heat engine as described in any one of claims 1 to 6.

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