Fin heat exchanger

Abstract

The present invention relates to the field of heat exchange equipment, and provides a fin heat exchanger, which includes a pressure-bearing cylinder, internal heat exchange fins, a flow channel sleeve, an inlet flow channel and an outlet flow channel; a plurality of external fins are arranged on the outer wall of the pressure-bearing cylinder, and grooves are formed between adjacent external fins; the flow channel sleeve is sleeved on the outside of the pressure-bearing cylinder, the inner wall of the flow channel sleeve is fitted with the side of the external fin away from the axis of the pressure-bearing cylinder, and the two ends of the flow channel sleeve are respectively fixedly connected to the pressure-bearing cylinder and form a seal; the internal heat exchange fins are fixedly arranged in the pressure-bearing cylinder, and a fluid channel from one end of the interior of the pressure-bearing cylinder to the other end of the interior of the pressure-bearing cylinder is formed between adjacent fins of the internal heat exchange fins; one end of the inlet flow channel and one end of the outlet flow channel are respectively connected to the interior of the flow channel sleeve, and the inlet flow channel is connected to the outlet flow channel via the groove. The fin heat exchanger provided by the present invention can effectively improve the heat exchange efficiency by reducing the angle between the fluid velocity vector and the temperature gradient.

Description

Technical Field

[0001] The invention relates to the field of heat exchange equipment, in particular to a fin heat exchanger. Background Art

[0002] A regenerative heat exchanger is a heat exchanger in which high and low temperature fluids alternately flow through the same flow channel space, and the fluids achieve heat exchange through direct contact with the regenerative filler. At present, the commonly used forms of regenerative heat engines are plate-fin type, shell-and-tube type, etc. These regenerative heat engines can meet most production needs.

[0003] In order to further improve the heat transfer efficiency and regenerative heat engine performance in plate-fin heat exchangers, it is necessary to reduce heat transfer losses. Common improvement methods include expanding the heat transfer area or improving the heat transfer performance of the heat transfer surface, reducing the thermal resistance of the dirt layer in the heat exchange tube, and reducing the velocity vector and temperature gradient angle.

[0004] Among them, reducing the angle between the velocity vector and the temperature gradient improves the performance of the regenerative heat engine by changing the fluid inlet angle without changing the heat exchanger material, coating and overall structure of the heat exchanger. The principle of this method is that the synergistic relationship between the temperature field and the velocity field will affect the boundary layer flow during convective heat transfer, reduce the heat lost by the fluid during the flow process, and enhance convective heat transfer. Reducing the angle between the fluid velocity vector and the temperature gradient is one of the effective means to improve heat transfer efficiency, and is increasingly being used in industrial production. Summary of the invention

[0005] An object of an embodiment of the present invention is to provide a fin heat exchanger for improving heat exchange efficiency by reducing the angle between a fluid velocity vector and a temperature gradient.

[0006] The embodiment of the present invention provides a fin heat exchanger, comprising a pressure-bearing cylinder, internal heat exchange fins, a flow channel sleeve, an inlet flow channel and an outlet flow channel;

[0007] A plurality of external fins are arranged on the outer wall of the pressure-bearing cylinder, and grooves are formed between adjacent external fins;

[0008] The flow channel sleeve is sleeved outside the pressure-bearing cylinder, the inner wall of the flow channel sleeve is in contact with the side of the outer fin away from the axis of the pressure-bearing cylinder, and the two ends of the flow channel sleeve are respectively fixedly connected to the pressure-bearing cylinder to form a seal;

[0009] The internal heat exchange fins are fixedly arranged in the pressure-bearing cylinder, and a fluid channel from one end inside the pressure-bearing cylinder to the other end inside the pressure-bearing cylinder is formed between adjacent fins of the internal heat exchange fins;

[0010] One end of the inlet flow channel and one end of the outlet flow channel are respectively communicated with the interior of the flow channel sleeve, and the inlet flow channel is communicated with the outlet flow channel via the groove.

[0011] Furthermore, the fin width direction of the internal heat exchange fins is along the radial direction of the pressure-bearing cylinder, and the fins of the internal heat exchange fins are arranged at intervals in the circumferential direction with the axis of the pressure-bearing cylinder as the center.

[0012] Furthermore, the flow channel sleeve is provided with a first annular flow channel and a second annular flow channel, both of which are annular cavities protruding radially outward from the flow channel sleeve, the inlet flow channel is connected to the first annular flow channel, and the outlet flow channel is connected to the second annular flow channel.

[0013] Furthermore, the first annular flow channel and the second annular flow channel are respectively located at two axial ends of the flow channel sleeve.

[0014] Furthermore, two first annular flow channels are provided, the two first annular flow channels are respectively located at two axial ends of the flow channel sleeve, the inlet flow channel is connected to the two first annular flow channels at the same time, and the second annular flow channel is located between the two first annular flow channels.

[0015] Further, the inlet flow channel is a three-way flow channel, one of the flow channels of the inlet flow channel is connected to one of the first annular flow channels, and the other flow channel of the inlet flow channel is connected to another of the first annular flow channels.

[0016] Furthermore, the fluid flow direction inside the outlet flow channel is along the tangent direction of the second annular flow channel.

[0017] Furthermore, the groove is an inclined groove which is arranged obliquely and extends continuously in the same direction, or is a bent groove which includes at least one angle.

[0018] Furthermore, the internal heat exchange fins are made of red copper or oxygen-free copper.

[0019] Furthermore, the pressure-bearing cylinder and the outer fins are integrally formed, and the pressure-bearing cylinder and the outer fins are made of stainless steel or high-temperature alloy steel.

[0020] The fin heat exchanger provided by the embodiment of the present invention realizes the heat exchange function through the heat exchange between the fluid flowing through the internal heat exchange fins and the fluid flowing through the grooves. The pressure tube has good pressure bearing capacity, and the fluid flowing through the internal heat exchange fins can be a high-pressure gas. The fluid channel formed between the adjacent fins of the internal heat exchange fins can realize a rapid heat exchange function; and the grooves can divide the fluid between the pressure tube and the flow channel sleeve into multiple streams, so that the temperature field and velocity field of the fluid flowing between the pressure tube and the flow channel sleeve are more uniform, reducing the angle between the fluid velocity vector and the temperature gradient, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 A partially cutaway perspective view of an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A three-dimensional view of another viewing angle after a partial section of the embodiment shown;

[0024] Figure 3 for Figure 1 The structural schematic diagram of one end face of the embodiment shown is partially cut away;

[0025] Figure 4 A partially cutaway perspective view of another embodiment of the present invention;

[0026] Figure 5 for Figure 4 A top view of the embodiment shown in FIG. 1 after partial sectioning;

[0027] In the figure, 1, inlet flow channel; 2, flow channel sleeve; 3, internal heat exchange fins; 4, pressure tube; 5, outlet flow channel; 6, first annular flow channel; 7, second annular flow channel; 8, external fins; 9, grooves. DETAILED DESCRIPTION

[0028] 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.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", and "multiple groups" mean two or more, and "several", "several roots", and "several groups" mean one or more.

[0031] See also Figure 1 , shows a schematic structural diagram of an embodiment of the present invention, in which, in order to clearly express the internal structure, the flow channel sleeve 2, the first annular flow channel 6 and the second annular flow channel 7 are partially cut away. The fin heat exchanger provided in this embodiment includes a pressure-bearing cylinder 4, internal heat exchange fins 3, a flow channel sleeve 2, an inlet flow channel 1 and an outlet flow channel 5.

[0032] The pressure-bearing cylinder 4 is a cylindrical rigid structure with openings at both ends, and a connection structure for connecting to the heat engine is provided at both ends, and the connection structure can be but is not limited to a thread. Fluids of different temperatures pass through the inner and outer sides of the pressure-bearing cylinder 4 to achieve a heat exchange function.

[0033] A plurality of external fins 8 are arranged on the outer wall of the pressure-bearing cylinder 4. The external fins 8 protrude from the surface of the pressure-bearing cylinder 4, and grooves 9 are formed between adjacent external fins 8. The grooves 9 can be used for the passage of fluid.

[0034] On the outer wall of the pressure-bearing cylinder 4 , a plurality of external fins 8 are evenly spaced and arranged along the circumference of the pressure-bearing cylinder 4 , forming a plurality of grooves 9 of the same size.

[0035] The flow channel sleeve 2 is a cylindrical sleeve structure with an inner diameter larger than the outer diameter of the pressure cylinder 4. The flow channel sleeve 2 is sleeved on the outside of the pressure cylinder 4. The inner wall of the flow channel sleeve 2 fits with the end of the outer fin 8 that is away from the axis of the pressure cylinder 4, so that a fluid channel along the groove 9 is formed between the flow channel sleeve 2, two adjacent outer fins 8 and the pressure cylinder 4.

[0036] The two ends of the flow channel sleeve 2 are respectively fixedly connected to the pressure-bearing cylinder 4 and form a seal, so that the flow channel sleeve 2 will not be separated from the pressure-bearing cylinder 4, and the fluid will not flow out radially from the two ends of the flow channel sleeve 2. The connection between the flow channel sleeve 2 and the pressure-bearing cylinder 4 can be one of welding, fixed connection through a sealing connector, or any other sealing connection method.

[0037] The internal heat exchange fin 3 includes multiple fins, and each fin on the internal heat exchange fin 3 is fixedly connected to the inner wall of the pressure tube 4, so that the internal heat exchange fin 3 is fixed as a whole in the pressure tube 4. The fins on the internal heat exchange fin 3 and the inner wall of the pressure tube 4 can be fixed by welding.

[0038] A fluid channel from one end of the interior of the pressure-bearing tube 4 to the other end of the interior of the pressure-bearing tube 4 is formed between adjacent fins of the internal heat-exchange fins 3. When the fluid passes through, heat exchange can be achieved between the fluid and the internal heat-exchange fins 3, between the fluid and the pressure-bearing tube 4, and between the internal heat-exchange fins 3 and the pressure-bearing tube 4. The internal heat-exchange fins 3 can separate multiple fluid channels, increase the heat exchange area, and improve the heat exchange efficiency.

[0039] One end of the inlet flow channel 1 and one end of the outlet flow channel 5 are respectively connected to the interior of the flow channel sleeve 2, and the inlet flow channel 1 is connected to the outlet flow channel 5 via the groove 9. The inlet flow channel 1 is used for the inflow of the external fluid of the pressure-bearing cylinder 4, and the outlet flow channel 5 is used for the outflow of the external fluid of the pressure-bearing cylinder 4. When the fluid passes through the groove 9, the heat exchange process can be completed.

[0040] During use, the two ends of the pressure-bearing cylinder 4 are connected to a heat engine respectively, and heat is supplied to the heat engines at both ends at the same time. The heat transfer fluid flows from the inlet flow channel 1 into the pressure-bearing cylinder 4 and the flow channel sleeve 2, and flows out from the outlet flow channel 5 after passing through the groove 9. When the heat transfer fluid passes through the groove 9, the heat of the heat transfer fluid is transferred to the high-pressure gas between the internal heat exchange fins 3 through the pressure-bearing cylinder 4. After the high-pressure gas is heated, thermoacoustic conversion is performed in the heat engines at both ends to complete the energy transfer.

[0041] The heat transfer fluid flowing through the groove 9 includes but is not limited to liquid fluids such as water, heat transfer oil, liquid metal or molten salt. The high-pressure gas inside the pressure tube 4 can be but is not limited to helium, argon and other gases. The gas pressure of the high-pressure gas is between 3 and 20 MPa.

[0042] See also Figure 2 In one embodiment of the present invention, the fin width direction of the internal heat exchange fin 3 is along the radial direction of the pressure tube 4, and the fins of the internal heat exchange fin 3 are arranged circumferentially with the axis of the pressure tube 4 as the center. A fluid channel can be formed between the fins of every two adjacent internal heat exchange fins 3. The multiple fluid channels formed by the internal heat exchange fins 3 separate the high-pressure gas into multiple streams, which can improve the heat exchange efficiency. In an optional scheme, the length direction of the internal heat exchange fin 3 is parallel to the axial direction of the pressure tube 4, so that the flow of high-pressure gas is smoother. In an optional scheme, a through hole that axially penetrates the internal heat exchange fin 3 is provided at the axial position of the internal heat exchange fin 3. The through hole is not connected to the fluid channel formed between two adjacent fins of the internal heat exchange fin 3. The through hole can be used for equipment installation. During use, the high-pressure gas does not enter the through hole.

[0043] In one embodiment of the present invention, the flow channel sleeve 2 is provided with a first annular flow channel 6 and a second annular flow channel 7, both of which are annular cavities protruding radially outward from the flow channel sleeve 2, and both the first annular flow channel 6 and the second annular flow channel 7 are connected to the groove 9, the inlet flow channel 1 is connected to the first annular flow channel 6, and the outlet flow channel 5 is connected to the second annular flow channel 7. The first annular flow channel 6 and the second annular flow channel 7 are preferably annular grooves coaxial with the flow channel sleeve 2. The fluid entering from the inlet flow channel 1 first enters the first annular flow channel 6, and then is dispersed into each groove 9 from the first annular flow channel 6, flows into the second annular flow channel 7 through each groove 9, and finally flows out from the outlet flow channel 5. By providing the first annular flow channel 6 and the second annular flow channel 7, the fluid can be dispersed more evenly, the heat exchange efficiency is higher, the heat loss generated is less, and the fluid can also perform a heat exchange process when it is in the first annular flow channel 6 and the second annular flow channel 7.

[0044] In one embodiment of the present invention, the first annular flow channel 6 and the second annular flow channel 7 are respectively located at the axial ends of the flow channel sleeve 2. At this time, the flow process of the fluid is that the fluid in the first annular flow channel 6 flows from one end of the groove 9 to the other end of the groove 9 and then enters the second annular flow channel 7.

[0045] In another embodiment of the present invention, two first annular flow channels 6 are provided, the two first annular flow channels 6 are respectively located at the two axial ends of the flow channel sleeve 2, the inlet flow channel 1 is simultaneously connected to the two first annular flow channels 6, and the second annular flow channel 7 is located between the two first annular flow channels 6. In this case, the fluid in the first annular flow channel 6 enters the groove 9 from both ends of the groove 9 at the same time, and flows toward the center of the groove 9 until it flows to the position connected with the second annular flow channel 7, and flows out of the second annular flow channel 7.

[0046] When two first annular flow channels 6 are provided, in order to allow the fluid in the inlet flow channel 1 to flow into the two first annular flow channels 6 at the same time, the inlet flow channel 1 is set as a three-way flow channel, one of the flow channels of the inlet flow channel 1 is connected to one first annular flow channel 6, and the other flow channel of the inlet flow channel 1 is connected to the other first annular flow channel 6. When the fluid is introduced into the inlet of the inlet flow channel 1, the fluid can enter the two first annular flow channels 6 at the same time.

[0047] See also Figure 3 In one embodiment of the present invention, the flow direction of the fluid inside the outlet flow channel 5 is along the tangent direction of the second annular flow channel 7. Specifically, the outlet flow channel 5 can be set as a straight pipe along the tangent direction of the second annular flow channel 7, or only the position on the outlet flow channel 5 connected to the second annular flow channel 7 can be set as a pipe body along the tangent direction of the second annular flow channel 7.

[0048] The outlet flow channel 5 is arranged so that the fluid flow direction inside the outlet flow channel 5 is along the tangent direction of the second annular flow channel 7, which can reduce the resistance of the fluid when it flows out of the second annular flow channel 7 and reduce energy loss.

[0049] In the embodiment of the present invention, the groove 9 can be an inclined groove that is arranged obliquely and extends continuously in the same direction, or a bent groove that includes at least one angle.

[0050] When the groove 9 adopts an inclined groove structure that is inclined and continuously extends in the same direction, the flow diversion direction of the groove 9 is not parallel to the axial direction of the pressure tube 4 .

[0051] See also Figure 4 and Figure 5 When there are two first annular flow channels 6, the groove 9 can be set as a V-shaped groove with two sections of non-parallel grooves, and preferably, the corner position of the groove 9 intersects with the second annular flow channel 7, so that the fluid in the groove can flow smoothly into the second annular flow channel 7.

[0052] It should be noted that the groove 9 of the V-shaped groove structure is only one type of the bent groove structure including at least one angle adopted by the groove 9. Other bent groove structures including at least one angle, such as multi-segment broken line shapes, can also achieve the purpose of the invention and should be within the protection scope of the invention.

[0053] In one embodiment of the present invention, the internal heat exchange fins 3 are made of red copper or oxygen-free copper, so that the internal heat exchange fins 3 have better thermal conductivity and improve the heat exchange efficiency.

[0054] In one embodiment of the present invention, the pressure-bearing cylinder 4 and the outer fins 8 are integrally formed, and the pressure-bearing cylinder 4 and the outer fins 8 are made of stainless steel or high-temperature alloy steel to prevent the pressure-bearing cylinder 4 from being corroded by the external heat transfer fluid, and to enable the pressure-bearing cylinder 4 and the outer fins 8 to have good firmness and not be deformed when subjected to high pressure.

[0055] Of course, the materials of the internal heat exchange fins 3, the pressure tube 4 and the external fins 8 given above are only preferred materials, and other materials that can meet the use requirements should also be within the protection scope of this application.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fin heat exchanger, characterized in that: It includes a pressure-bearing cylinder, internal heat exchange fins, a flow channel sleeve, an inlet flow channel and an outlet flow channel; A plurality of external fins are arranged on the outer wall of the pressure-bearing cylinder, and grooves are formed between adjacent external fins; The flow channel sleeve is sleeved outside the pressure-bearing cylinder, the inner wall of the flow channel sleeve is in contact with the side of the outer fin away from the axis of the pressure-bearing cylinder, and the two ends of the flow channel sleeve are respectively fixedly connected to the pressure-bearing cylinder to form a seal; The internal heat exchange fins are fixedly arranged in the pressure-bearing cylinder, and a fluid channel from one end inside the pressure-bearing cylinder to the other end inside the pressure-bearing cylinder is formed between adjacent fins of the internal heat exchange fins; One end of the inlet flow channel and one end of the outlet flow channel are respectively connected to the interior of the flow channel sleeve, and the inlet flow channel is connected to the outlet flow channel via the groove; the flow channel sleeve is provided with a first annular flow channel and a second annular flow channel, the first annular flow channel and the second annular flow channel are both annular cavities protruding radially outward from the flow channel sleeve, the inlet flow channel is connected to the first annular flow channel, and the outlet flow channel is connected to the second annular flow channel; the groove is an inclined groove that is inclined and continuously extends in the same direction or a bent groove containing at least one angle; there are two first annular flow channels, and the two first annular flow channels are respectively located at the axial ends of the flow channel sleeve, the inlet flow channel is connected to the two first annular flow channels at the same time, and the second annular flow channel is located between the two first annular flow channels; the inlet flow channel is a three-way flow channel, one of the inlet flow channels is connected to one of the first annular flow channels, and the other flow channel of the inlet flow channel is connected to another first annular flow channel.

2. The fin heat exchanger according to claim 1, characterized in that: The fin width direction of the internal heat exchange fin is along the radial direction of the pressure-bearing cylinder, and the fins of the internal heat exchange fin are arranged at intervals in the circumferential direction with the axis of the pressure-bearing cylinder as the center.

3. The fin heat exchanger according to claim 1, characterized in that: The fluid flow direction inside the outlet flow channel is along the tangent direction of the second annular flow channel.

4. The fin heat exchanger according to claim 1, characterized in that: The internal heat exchange fins are made of red copper or oxygen-free copper.

5. The fin heat exchanger according to claim 1, characterized in that: The pressure-bearing cylinder and the outer fins are integrally formed, and the pressure-bearing cylinder and the outer fins are made of stainless steel or high-temperature alloy steel.

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