CN214666240U

CN214666240U - Printed circuit board heat exchanger and core for heat exchange of variable-property fluid

Info

Publication number: CN214666240U
Application number: CN202120662790.5U
Authority: CN
Inventors: 吴家荣; 李红智; 杨玉; 张磊; 张旭伟; 乔永强
Original assignee: Xian Thermal Power Research Institute Co Ltd
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-11-09
Anticipated expiration: 2031-03-31

Abstract

The utility model provides a printed circuit board heat exchanger and core for becoming rerum natura fluid heat transfer, simple structure, reasonable in design has avoided because of density reduces, and the phenomenon of the local backward flow or the refluence that the velocity of flow increase appears. The core body comprises a high-temperature fluid plate and a low-temperature fluid plate which are arranged in a stacked mode; the high-temperature fluid plate comprises a high-temperature flow channel body and a plurality of high-temperature streamline fins arranged in the high-temperature flow channel body row by row along the flowing direction of the high-temperature fluid; the high-temperature streamline fins are arranged in equal thickness; the low-temperature fluid sheet comprises a low-temperature flow channel body and a plurality of low-temperature streamline fins arranged in the low-temperature flow channel body row by row along the flowing direction of the low-temperature fluid; the low temperature streamline fins are gradually reduced in thickness along the flow direction.

Description

Printed circuit board heat exchanger and core for heat exchange of variable-property fluid

Technical Field

The utility model relates to a heat transfer device technical field, concretely relates to a printed circuit board heat exchanger and core for becoming rerum natura fluid heat transfer.

Background

The printed circuit board heat exchanger (PCHE) is a plate heat exchanger with compact structure, high temperature and high pressure resistance and high structural strength, is particularly suitable for Brayton power cycle using supercritical fluid as working medium, and has a main structure comprising an inlet pipe and an outlet pipe of heat exchange fluid, a seal head and a core body, wherein the core body is formed by diffusion welding of heat exchange plates comprising a plurality of micro heat exchange channels with equal cross sections.

When the heat exchange fluid in the PCHE core is a metamorphic fluid, such as a supercritical fluid, the flowing heat exchange process of the high and low temperature fluids is a double-side supercritical metamorphic coupling flowing heat transfer process, the density, specific heat capacity, viscosity and other physical properties of the high and low temperature fluids are continuously changed, and the flow rate is also continuously changed. In the existing uniform-section heat exchange channel, for a fluid heated at low temperature, the density is gradually reduced due to continuous heat absorption and temperature rise, particularly near a pseudo-critical point, the density is rapidly reduced, so that the flow speed is rapidly increased, the local flow resistance is increased, local backflow and even backflow can be caused, the flow resistance is further increased, the low-temperature fluid cannot be effectively heated, and the heat exchange efficiency is greatly reduced.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a printed circuit board heat exchanger and core for becoming rerum natura fluid heat transfer, simple structure, reasonable in design has avoided because of density reduces, the phenomenon of the local backward flow or the refluence that the velocity of flow increase goes out.

The utility model discloses a realize through following technical scheme:

a printed circuit board heat exchanger core for heat exchange of metamorphic fluid comprises a high-temperature fluid plate and a low-temperature fluid plate which are arranged in a stacked mode;

the high-temperature fluid plate comprises a high-temperature flow channel body and a plurality of high-temperature streamline fins arranged in the high-temperature flow channel body row by row along the flowing direction of the high-temperature fluid; the high-temperature streamline fins are arranged in equal thickness;

the low-temperature fluid sheet comprises a low-temperature flow channel body and a plurality of low-temperature streamline fins arranged in the low-temperature flow channel body row by row along the flowing direction of the low-temperature fluid; the low temperature streamline fins are gradually reduced in thickness along the flow direction.

Preferably, the high temperature fluid sheets and the low temperature fluid sheets arranged in a stack form a periodically stacked unit; the periodical laminated unit comprises a layer of high-temperature fluid plate and a layer of low-temperature fluid plate which are connected in sequence through diffusion welding, or two layers of high-temperature fluid plates and a middle layer of low-temperature fluid plate.

Preferably, the high-temperature streamline fins are distributed in the same row or staggered along the flowing direction of the high-temperature fluid to form uniform-section channels.

Preferably, the cryogenic streamline fins are distributed along the flowing direction of the cryogenic fluid in a staggered way to form gradually-widening non-uniform section channels.

Preferably, the high-temperature streamline fins and the low-temperature streamline fins adopt NACA series symmetrical or asymmetrical airfoil shapes.

Further, the maximum thickness of the low-temperature streamline fins is reduced row by row in sequence.

Preferably, a plurality of high-temperature streamline ribs and low-temperature streamline ribs which are not arranged at the same thickness are correspondingly etched on the high-temperature fluid plate and the low-temperature fluid plate in the flowing direction by a photoetching or chemical etching method.

A printed circuit board heat exchanger for heat exchange of variable-property fluid is provided with the core body.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model discloses a printed circuit board heat exchanger core body for heat exchange of variable physical property fluid, which adopts streamline fins to strengthen the heat exchange of high temperature fluid and simultaneously reduce the increase of flow resistance as much as possible; the thickness of the fins is gradually reduced along the flowing direction to form gradually-widened non-uniform-section channels, so that the low-temperature fluid can keep flowing at a nearly constant speed when the low-temperature fluid absorbs heat and the temperature rise density is reduced along the flowing direction, and the phenomenon of local backflow or backflow caused by the fact that the density of the low-temperature fluid is reduced, the flowing speed is increased, and the local flowing resistance is increased is avoided.

Drawings

Figure 1 is a schematic cross-sectional view of a cryogenic fluid sheet fin arrangement as described in an example of the present invention.

Fig. 2 is a schematic cross-sectional view of a high temperature fluid sheet rib arrangement according to an embodiment of the present invention.

Figure 3 is a schematic representation of a cryogenic fluid slab as described in an example of the invention.

Fig. 4 is a schematic view of a high temperature fluid sheet according to an embodiment of the present invention.

In the figure: the high-temperature fluid plate comprises a high-temperature fluid plate 1, a high-temperature flow channel body 101 and high-temperature streamline ribs 102; the cryogenic fluid plate 2, the cryogenic fluid channel body 201 and the cryogenic streamline rib 202.

Detailed Description

The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.

The utility model relates to a printed circuit board heat exchanger core body for heat exchange of metamorphic fluid, which comprises a high-temperature fluid sheet 1 and a low-temperature fluid sheet 2 which are arranged in a stacking way;

as shown in fig. 3, the cryogenic fluid slab 2 includes a cryogenic fluid channel body 201, and a plurality of cryogenic streamline ribs 202 arranged in the cryogenic fluid channel body 201 in a line by line along the flow direction of the cryogenic fluid; the cryostreamlined rib 202 tapers in thickness in the direction of flow. The thickness of the film is reduced in the preferred embodiment column by column, and the thickness of the film can be reduced again in every two columns, so that the film tends to be gradually reduced.

As shown in fig. 4, the high-temperature fluid plate 1 includes a high-temperature flow channel body 101, and a plurality of high-temperature streamline fins 102 arranged in the high-temperature flow channel body 101 in a row by row along a flow direction of the high-temperature fluid; the high-temperature streamline ribs 102 are arranged in equal thickness;

the thickness limited by the thickness is the size of the high-temperature streamline rib 102 and the low-temperature streamline rib 202 in the width direction of the high-temperature runner body 101 and the low-temperature runner body 201, and the upper side and the lower side of the two types of ribs are respectively connected with the bottom of the inner side of the runner body where the two types of ribs are located and the bottom of the outer side of the runner body adjacent to the two types of ribs.

It is essential that, as shown in fig. 1 and 2, the core comprises a plurality of high temperature fluid plates 1 formed by streamline ribs with equal thickness along the flow direction and a plurality of low temperature fluid plates 2 formed by streamline ribs with gradually decreasing thickness along the flow direction.

Wherein the high temperature fluid sheets 1 and the low temperature fluid sheets 2 which are arranged in a stacked manner form a periodic stacked unit; the heat exchange core body of the printed circuit board heat exchanger is formed by laminating a plurality of periodically laminated units; the periodical laminated unit comprises a layer of high-temperature fluid plate 1 and a layer of low-temperature fluid plate 2 which are connected in sequence through diffusion welding, or two layers of high-temperature fluid plates 1 and an intermediate layer of low-temperature fluid plate 2.

Specifically, a high-temperature fluid plate 1 and a low-temperature fluid plate 2 are connected in sequence through diffusion welding or a layer of low-temperature fluid plate 2 is sandwiched between two layers of high-temperature fluid plates 1 to form a high-temperature-low-temperature and high-temperature-low-temperature periodic distribution mode.

The high temperature streamline fin 102 and the low temperature streamline fin 202 are etched by light or chemical etching on the metal plate to form streamline fins with equal thickness and unequal thickness along the flow direction, as shown in fig. 4 and 3.

The streamline fins can adopt but are not limited to NACA series symmetrical or asymmetrical airfoil.

Specifically, as shown in fig. 1, NACA series of low-speed symmetrical airfoil profiles NACA0025, NACA0020, NACA0015, NACA0010 and NACA0005 airfoil profiles are selected as low-temperature streamline fins 202 of each row, the maximum thickness of the airfoil profiles is gradually reduced in sequence, the airfoil profiles are distributed along the flowing direction of the low-temperature fluid in a staggered manner, a gradually-widened non-uniform-section channel is formed, and the low-temperature streamline fins are suitable for heat exchange media with gradually-reduced density along the flowing direction.

Specifically, as shown in fig. 2, in the high-temperature fluid plate 1, a streamlined rib NACA0010 is selected, and the thickness of the rib is kept constant, so that the rib NACA0010 is distributed along the flow direction of the high-temperature fluid in a staggered manner to form a uniform-section channel.

The utility model discloses a theory of operation:

the utility model provides a pair of PCHE heat exchange core body for becoming rerum natura fluid heat transfer, include the high temperature fluid slab 1 that comprises a plurality of uniform thickness streamline fins along flow direction and the low temperature fluid slab 2 that the streamline fin constitutes is reduced gradually along flow direction thickness. The plate adopts streamline fins to strengthen heat exchange and simultaneously reduce the increase of flow resistance as much as possible; the thickness of the fins is gradually reduced along the flowing direction to form a gradually-widened channel with a non-uniform section, so that the low-temperature fluid can keep flowing at a nearly constant speed when the low-temperature fluid absorbs heat and the temperature is increased along the flowing direction, and the phenomenon of local backflow or backflow caused by the fact that the density is reduced and the flow speed is increased is avoided.

The above description is only a preferred example of the present invention, and the present invention is not limited thereto, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A printed circuit board heat exchanger core for heat exchange of variable property fluid is characterized by comprising a high-temperature fluid plate (1) and a low-temperature fluid plate (2) which are arranged in a laminated manner;

the high-temperature fluid plate (1) comprises a high-temperature flow channel body (101) and a plurality of high-temperature streamline ribs (102) which are arranged in the high-temperature flow channel body (101) row by row along the flowing direction of the high-temperature fluid; the high-temperature streamline ribs (102) are arranged in an equal thickness mode;

the low-temperature fluid plate (2) comprises a low-temperature runner body (201) and a plurality of low-temperature streamline ribs (202) which are arranged in the low-temperature runner body (201) row by row along the flowing direction of the low-temperature fluid; the cryostreamlined rib (202) has a thickness that gradually decreases in the direction of flow.

2. A printed circuit board heat exchanger core for heat exchange of a variable property fluid according to claim 1, characterized in that the high temperature fluid plates (1) and the low temperature fluid plates (2) arranged in a stack form a periodic stacked unit; the periodical laminated unit comprises a layer of high-temperature fluid plate (1) and a layer of low-temperature fluid plate (2) which are connected in sequence through diffusion welding, or two layers of high-temperature fluid plates (1) and a middle layer of low-temperature fluid plate (2).

3. The core body of the printed circuit board heat exchanger for the heat exchange of the variable property fluid, according to claim 1, wherein the high temperature streamline fins (102) are distributed along the flowing direction of the high temperature fluid in a staggered way to form a uniform section channel.

4. The core of a printed circuit board heat exchanger for variable property fluid heat exchange according to claim 1, wherein the cryostreamlined fins (202) are distributed in-line or staggered along the cryogenic fluid flow direction to form a gradually widening type channel with a non-uniform cross section.

5. The printed circuit board heat exchanger core for metamorphic fluid heat exchange according to claim 1 wherein the high temperature streamlined fins (102) and the low temperature streamlined fins (202) are NACA series symmetric or asymmetric airfoils.

6. A printed circuit board heat exchanger core for variable property fluid heat exchange according to claim 5, wherein the maximum thickness of the cryostreamlined fins (202) decreases in sequence row by row.

7. The printed circuit board heat exchanger core for the heat exchange of the variable property fluid is characterized in that a plurality of high-temperature streamline fins (102) and low-temperature streamline fins (202) which are arranged in the flowing direction in an equal thickness mode are correspondingly etched on the high-temperature fluid plate (1) and the low-temperature fluid plate (2) through a photoetching or chemical etching method.

8. A printed circuit board heat exchanger for heat exchange of a variable property fluid, provided with a core as claimed in any one of claims 1 to 7.