Printed circuit board type heat exchanger core body with staggered winding type flow channels

Abstract

The invention provides a printed circuit board type heat exchanger core with staggered winding type flow channels, which relates to the technical field of heat exchange devices and comprises a plurality of layers of metal plates which are stacked and welded into a whole through vacuum diffusion welding and are provided with flow channels on the surfaces. The heat exchanger core body comprises an upper cover plate with a plurality of discontinuous flow channels, a lower cover plate with a plurality of discontinuous flow channels and a perforated metal plate with a plurality of discontinuous flow channels on the two faces, and the heat exchanger core body is formed by stacking plate sheets. The upper cover plate, the perforated metal plate with the discontinuous runners on the two faces and the lower cover plate are sequentially stacked to form a unit, and the whole heat exchanger core is formed by periodically stacking a plurality of units. The cross-flow heat exchanger aims to solve the problem that a traditional cross-flow heat exchanger is low in heat exchange efficiency, disturbance of a heat exchange working medium is enhanced, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange devices, and in particular to a printed circuit board type heat exchanger core with staggered winding flow channels. Background Art

[0002] Printed Circuit Heat Exchanger (PCHE) is a new type of high-efficiency heat exchange equipment with the advantages of high compactness, good heat transfer performance, and good operation under extreme high temperature and high pressure. It is gradually being used in the energy industry, such as vaporization heat exchangers for liquefied natural gas, high and low temperature regenerators for supercritical carbon dioxide power generation, and intercoolers for nuclear reactors.

[0003] The PCHE's fluid channels are etched into the heat exchange plates using a mechanical photoelectrochemical etching process. The plates are then joined together using vacuum diffusion welding to form the heat exchange core. PCHE flow paths primarily include straight channels, Z-shaped channels, S-shaped channels, and airfoil fins. The flow patterns of the straight channels primarily include co-current, counter-current, and cross-current.

[0004] Traditional cross-flow flow channels can generally be approximated as a two-dimensional flat-plate flow model. In this model, the fluid flow state is relatively simple, with minimal disturbance. Consequently, its ability to comprehensively optimize heat transfer performance and flow resistance is limited. The small logarithmic mean temperature difference of a cross-flow heat exchanger requires a larger cross-flow heat exchange area, resulting in larger equipment size, poor economic efficiency, and a need for further improvement in heat transfer efficiency. Summary of the Invention

[0005] In response to the technical problems mentioned in the above background technology, a printed circuit board type heat exchanger core with staggered winding flow channels is provided.

[0006] The technical means adopted in the present invention are as follows:

[0007] A printed circuit board type heat exchanger core with staggered winding flow channels, comprising: a metal plate sheet with etched flow channels on the surface, which is formed by stacking multiple metal plates and welding them into one piece by vacuum diffusion welding;

[0008] The heat exchanger core includes: an upper cover plate with a plurality of discontinuous flow channels, a lower cover plate with a plurality of discontinuous flow channels, and a perforated metal plate with a plurality of discontinuous flow channels on both sides; the upper cover plate with a plurality of discontinuous flow channels, the perforated metal plate with discontinuous flow channels on both sides, and the lower cover plate are periodically stacked in the order of upper cover plate-perforated metal plate-lower cover plate to form a three-dimensional flow channel in which cold and hot fluids are intertwined and entangled in a woven shape.

[0009] Furthermore, the flow channels of the upper cover plate having a plurality of discontinuous flow channels and the lower cover plate having a plurality of discontinuous flow channels are arranged in a staggered manner.

[0010] Furthermore, the arrangement of the flow channels on the upper surface of the perforated metal plate having a plurality of discontinuous flow channels on both sides is the same as the arrangement of the flow channels of the upper cover plate having a plurality of discontinuous flow channels, and the arrangement of the flow channels on the lower surface of the perforated metal plate having a plurality of discontinuous flow channels on both sides is the same as the arrangement of the flow channels of the lower cover plate having a plurality of discontinuous flow channels.

[0011] Furthermore, the cross-sectional shapes of the flow channels of the upper cover plate with a plurality of discontinuous flow channels, the lower cover plate with a plurality of discontinuous flow channels, and the perforated metal plate with a plurality of discontinuous flow channels on both sides are any one or more combinations of semicircular, rectangular, elliptical, and trapezoidal.

[0012] Furthermore, the flow channels of the upper cover plate with a plurality of discontinuous flow channels, the lower cover plate with a plurality of discontinuous flow channels, and the perforated metal plate with a plurality of discontinuous flow channels on both sides are arranged in parallel and periodically in the transverse direction and the longitudinal direction.

[0013] Furthermore, the flow channels and perforations of the perforated metal plate having a plurality of discontinuous flow channels on both sides are parallel and periodically arranged.

[0014] Furthermore, the perforations of the perforated metal plate with a plurality of discontinuous flow channels on both sides and the vertical projections of the flow channels of the upper cover plate with a plurality of discontinuous flow channels and the lower cover plate with a plurality of discontinuous flow channels form an overlapping area shape.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1) This invention effectively enhances disturbances. Fluid flow in periodic up-and-down channels on the plate is equivalent to adding vertical motion perpendicular to the flow plane to a traditional two-dimensional printed circuit board heat exchanger. Furthermore, due to the periodic interweaving of the hot and cold fluids, the two fluids form an intertwined flow pattern. This continuously disrupts the fluid boundary layer during the flow and heat exchange process, enhancing the field synergy effect and improving the heat transfer efficiency.

[0017] 2) The turbulent flow in the heat exchanger has a self-cleaning effect, which can reduce the generation of dirt and reduce the cleaning frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 any creative labor.

[0019] Figure 1 It is a three-dimensional schematic diagram of the heat exchanger core of the present invention;

[0020] Figure 2 The back side of the upper cover plate of the heat exchanger core of the present invention having a plurality of discontinuous flow channels;

[0021] Figure 3 The front side of the lower cover plate of the heat exchanger core of the present invention having a plurality of discontinuous flow channels;

[0022] FIG4( a ) is a perspective schematic diagram of a heat exchanger core of the present invention having a plurality of discontinuous flow channels on both sides of a perforated metal plate;

[0023] FIG4( b ) is a front view of a heat exchanger core according to the present invention having a plurality of discontinuous flow channels on both sides of a perforated metal plate;

[0024] FIG4( c ) is a partial enlarged view of a perforated metal plate having a plurality of discontinuous flow channels on both sides of the heat exchanger core of the present invention;

[0025] FIG4( d ) is a schematic diagram of the back side of a perforated metal plate having a plurality of discontinuous flow channels on both sides of a heat exchanger core according to the present invention;

[0026] Figure 5 It is a flow diagram of the heat exchange flow channel unit of the present invention.

[0027] Among them, 1 is an upper cover plate with a plurality of discontinuous flow channels; 2 is a lower cover plate with a plurality of discontinuous flow channels; 3 is a perforated metal plate with a plurality of discontinuous flow channels on both sides. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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 only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0032] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0035] like Figure 1-5 As shown, the present invention provides a printed circuit board type heat exchanger core with staggered winding flow channels, comprising: metal plates with flow channels on the surface that are stacked in multiple layers and welded into one body by vacuum diffusion welding.

[0036] At the same time, as a preferred embodiment, in the present application, the heat exchanger core has an upper cover plate with a plurality of discontinuous flow channels, a lower cover plate with a plurality of discontinuous flow channels, and a perforated metal plate with a plurality of discontinuous flow channels on both sides; the combination of the upper cover plate with a plurality of discontinuous flow channels and the lower cover plate with the perforated metal plate with the discontinuous flow channels is periodically superimposed, that is, according to Figure 1 As shown, a lower cover plate with several discontinuous flow channels, a perforated metal plate with several discontinuous flow channels on both sides, and an upper cover plate with several discontinuous flow channels are stacked in this order to form a unit. Finally, multiple units are stacked and diffusion welded to form a whole core body.

[0037] In this embodiment, the upper cover plate with discontinuous flow channels and the perforated metal plate with double-sided discontinuous flow channels are provided with a plurality of flow channels on both sides, and the flow channels are processed onto the metal plate with discontinuous flow channels through an etching process or mechanical processing; the flow channels of the perforated metal plate with discontinuous flow channels are arranged in a staggered manner on the upper and lower surfaces; the flow channels are discontinuous, and one or more guide flow channels are provided around each surface.

[0038] As a preferred embodiment, the number of flow channels provided herein should be designed according to actual project needs. For example, under high-flow operating conditions, more flow channels should be used. However, more flow channels are not necessarily better. Increasing the number of flow channels increases the difficulty of processing. Therefore, the specific number of flow channels can be selected based on actual production needs.

[0039] As a preferred embodiment, the cross-sectional shape of the metal plates of the discontinuous flow channel is any one or more of a semicircular, rectangular, elliptical, and trapezoidal shape. The attached figure shows an elliptical shape, where the cross-sectional shape of each metal plate is half an ellipse, and the two metal plates are combined to form a complete ellipse. The centerline of the flow channel is a combination of a straight line and a curved line. The attached figure shows a straight line, where the metal plates are all straight lines, while the curved line replaces these straight lines with curves of a certain arc.

[0040] As a preferred embodiment, in this application, the flow channels, wherein the hot and cold flow channels are each characterized by a parallel periodic arrangement. The flow channels and perforations of the hot and cold flow channels of the perforated metal plate 3 with double-sided discontinuous flow channels are each arranged in parallel periodically. The flow channels and perforations on the front side are shown in FIG4(b), and the flow channels and perforations on the back side are shown in FIG4(d). The stacking of the plates will form an interlaced winding of the hot and cold flow channels. Figure 5 It represents one of the units. The entire heat exchanger core is composed of several units periodically stacked together, and each unit is also parallel to each other.

[0041] Preferably, the upper surface flow channels of the perforated metal plate 3 with double-sided discontinuous flow channels are arranged in the same manner as the flow channels of the upper cover plate 1 of the discontinuous flow channels, and the lower surface flow channels of the perforated metal plate 3 with double-sided discontinuous flow channels are arranged in the same manner as the flow channels of the lower cover plate 2 of the discontinuous flow channels, and the perforations are in the shape of the overlapping area formed by the vertical projections of the flow channels of the upper cover plate 1 of the discontinuous flow channels and the lower cover plate 2 of the discontinuous flow channels.

[0042] 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A printed circuit board type heat exchanger core with staggered winding flow channels, comprising: A metal sheet having etched flow channels on the surface of a plurality of metal plates stacked and welded together by vacuum diffusion welding, characterized in that: The heat exchanger core comprises: an upper cover plate (1) having a plurality of discontinuous flow channels, a lower cover plate (2) having a plurality of discontinuous flow channels, and a perforated metal plate (3) having a plurality of discontinuous flow channels on both sides; the upper cover plate (1) having a plurality of discontinuous flow channels, the perforated metal plate (3) having discontinuous flow channels on both sides, and the lower cover plate (2) are periodically superimposed in the order of upper cover plate (1) - perforated metal plate (3) - lower cover plate (2) to form a three-dimensional flow channel in which hot and cold fluids are intertwined and entangled in a braided shape.

2. The printed circuit board type heat exchanger core with staggered winding flow channels according to claim 1, characterized in that: The flow channels of the upper cover plate (1) having a plurality of discontinuous flow channels and the lower cover plate (2) having a plurality of discontinuous flow channels are arranged in a staggered manner.

3. The printed circuit board type heat exchanger core with staggered winding flow channels according to claim 1, characterized in that: The arrangement of the flow channels on the upper surface of the perforated metal plate (3) having a plurality of discontinuous flow channels on both sides is the same as the arrangement of the flow channels of the upper cover plate (1) having a plurality of discontinuous flow channels, and the arrangement of the flow channels on the lower surface of the perforated metal plate (3) having a plurality of discontinuous flow channels on both sides is the same as the arrangement of the flow channels of the lower cover plate (2) having a plurality of discontinuous flow channels.

4. A printed circuit board type heat exchanger core with staggered winding flow channels according to claim 1 or 3, characterized in that: The cross-sectional shapes of the flow channels of the upper cover plate (1) having a plurality of discontinuous flow channels, the lower cover plate (2) having a plurality of discontinuous flow channels, and the perforated metal plate (3) having a plurality of discontinuous flow channels on both sides are any one or more combinations of semicircular, rectangular, elliptical, and trapezoidal shapes.

5. A printed circuit board type heat exchanger core with staggered winding flow channels according to any one of claims 1, 3 or 4, characterized in that: The flow channels of the upper cover plate (1) having a plurality of discontinuous flow channels, the lower cover plate (2) having a plurality of discontinuous flow channels, and the perforated metal plate (3) having a plurality of discontinuous flow channels on both sides are arranged in parallel and periodically in the transverse direction and the longitudinal direction.

6. The printed circuit board type heat exchanger core with staggered winding flow channels according to claim 1, characterized in that: The perforated metal plate (3) having a plurality of discontinuous flow channels on both sides has flow channels and perforations that are parallel and periodically arranged.

7. The printed circuit board type heat exchanger core with staggered winding flow channels according to claim 1, characterized in that: The overlapping area shape is formed by the vertical projections of the perforations of the perforated metal plate (3) with multiple discontinuous flow channels on both sides and the flow channels of the upper cover plate (1) with multiple discontinuous flow channels and the lower cover plate (2) with multiple discontinuous flow channels.

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