Efficient compact micro-channel heat exchanger

Abstract

The utility model provides an efficient compact micro-channel heat exchanger, and belongs to the field of printed circuit board heat exchangers. The heat exchanger comprises a core body as well as a cold fluid inlet seal head, a hot fluid inlet seal head, a cold fluid outlet seal head and a hot fluid outlet seal head which are respectively connected with the core body in a welding manner, wherein the core body comprises a pressing plate, a base plate, a cold side fluid heat exchange plate, a hot side fluid heat exchange plate and a positioning pin; the flow channel structure on the hot fluid side heat exchange plate is of a zigzag flow channel straight channel structure, and the flow channel structure on the cold fluid side heat exchange plate is of a zigzag flow channel Z-shaped structure. The efficient compact micro-channel heat exchanger is compact in structure, and the heat exchange effect and the pressure bearing capacity of the heat exchanger are improved.

Description

Technical Field

[0001] The utility model belongs to the field of printed circuit board heat exchangers, in particular to a high-efficiency compact micro-channel printed circuit board heat exchanger. Background Art

[0002] Printed circuit board heat exchanger is a new type of microchannel plate heat exchanger with the advantages of compact structure, high heat transfer efficiency, high temperature resistance, high pressure resistance, safety and reliability. Its heat transfer efficiency is as high as 98%, pressure resistance is above 60 MPa, temperature resistance range is -200~900℃, compactness is up to 2500 m 2 / m 3 The volume and weight are reduced by about 80% compared with conventional shell and tube heat exchangers. It has unparalleled advantages over conventional heat exchangers in the fields of supercritical CO2 power generation, solar thermal power generation, nuclear power, LNG ships, gas turbines, hydrogenation stations, heat pumps, etc. With the proposal of the "dual carbon" goal and the continuous improvement of the country's requirements for clean energy utilization, energy conservation and environmental protection in recent years, the market prospects for printed circuit board heat exchangers are broad in the future.

[0003] At present, heat exchangers are gradually developing towards high efficiency, energy saving, environmental protection, corrosion resistance and miniaturization, which is not only a realistic market need, but also an inherent requirement for sustainable development; and printed circuit board heat exchangers fully meet the market's application needs for heat exchangers. Therefore, it is of great significance to develop an efficient and compact printed circuit board heat exchanger for use in harsh working environments. Summary of the invention

[0004] In view of this, in order to improve the heat transfer efficiency and structural compactness of the heat exchanger, the utility model provides a high-efficiency compact microchannel heat exchanger, which is a printed circuit board heat exchanger, which improves the compactness, heat transfer effect and pressure bearing capacity of the heat exchanger.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is a highly efficient and compact microchannel heat exchanger, including a core body and a cold fluid inlet head, a hot fluid inlet head, a cold fluid outlet head, and a hot fluid outlet head respectively welded to the core body, the core body includes a pressing plate, a pad, a cold side fluid heat exchange plate, a hot side fluid heat exchange plate, and a positioning pin, the flow channels arranged on the cold side fluid heat exchange plate are respectively connected to the cold fluid inlet head and the cold fluid outlet head, and the hot side fluid heat exchange plate is provided with a pressure plate, a pad, a cold side fluid heat exchange plate, and a positioning pin. The flow channels are respectively connected with the hot fluid inlet head and the hot fluid outlet head. The two pads are arranged between the two pressure plates. A plurality of cold side fluid heat exchange plates and a plurality of hot side fluid heat exchange plates are alternately stacked to form a heat exchange unit module. The heat exchange unit module is located between the two pads. A plurality of positioning pin holes are correspondingly arranged on the pressure plate, the pad, the cold side fluid heat exchange plate and the hot side fluid heat exchange plate. The positioning pins are installed in the positioning pin holes to position and install the pressure plate, the pad, the cold side fluid heat exchange plate and the hot side fluid heat exchange plate.

[0006] Furthermore, the cold fluid inlet head, hot fluid inlet head, cold fluid outlet head and hot fluid outlet head are all one-piece heads formed by integrally processing flanges, flange connecting pipes and round tubes using forgings.

[0007] Furthermore, the flow channel cross-sections on the cold side fluid heat exchange plates and the hot side fluid heat exchange plates are both semicircular structures, and the flow channels on the cold side fluid heat exchange plates and the hot side fluid heat exchange plates are both processed by chemical etching technology. The cross-sectional size and rib width of the cold fluid side flow channel on the cold side fluid heat exchange plates are different from the cross-sectional size and rib width of the hot fluid side flow channel on the hot side fluid heat exchange plates.

[0008] Furthermore, the flow channel structure on the heat exchange plate on the hot fluid side is a zigzag flow channel straight channel structure, and the flow channel structure on the heat exchange plate on the cold fluid side is a zigzag flow channel Z-shaped structure.

[0009] Furthermore, the materials of the pressure plate, the backing plate, the cold side fluid heat exchange plate, the hot side fluid heat exchange plate, and the positioning pins are consistent.

[0010] Furthermore, the pressing plate, the backing plate, the cold side fluid heat exchange plate, and the hot side fluid heat exchange plate are of the same length and width, and the backing plate, the cold side fluid heat exchange plate, and the hot side fluid heat exchange plate are of the same thickness.

[0011] Beneficial technical effects of the utility model: the high-efficiency compact microchannel heat exchanger of the utility model has a compact structure, which improves the heat exchange effect and pressure bearing capacity of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a top view of the high-efficiency compact microchannel heat exchanger of the utility model;

[0013] Figure 2 for Figure 1 A right sectional view of the core body;

[0014] Figure 3 for Figure 2 Sectional view of the middle AA plane;

[0015] Figure 4 for Figure 3 Schematic diagram of the structure of the medium hot fluid heat exchange plate and the cold fluid heat exchange plate;

[0016] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0017] Figure markings: 1-cold fluid inlet head, 2-hot fluid inlet head, 3-cold fluid outlet head, 4-core, 5-hot fluid outlet head, 6-pressure plate, 7-pad, 8-hot fluid heat exchange plate, 9-cold fluid heat exchange plate, 10-cold fluid side channel, 11-locating pin, 12-hot fluid side channel, D-channel cross-sectional width, L-rib width. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through preferred embodiments.

[0019] like Figure 1-5 As shown, a high-efficiency and compact microchannel heat exchanger of this embodiment includes a core body 4 and a cold fluid inlet head 1, a hot fluid inlet head 2, a cold fluid outlet head 3, and a hot fluid outlet head 5 respectively welded to the core body 4, the core body 4 includes a pressing plate 6, a pad 7, a cold side fluid heat exchange plate, a hot side fluid heat exchange plate, and a positioning pin 11, the flow channels arranged on the cold side fluid heat exchange plate are respectively connected to the cold fluid inlet head 1 and the cold fluid outlet head 3, and the flow channels arranged on the hot side fluid heat exchange plate are respectively connected to the hot side fluid heat exchange plate The fluid inlet head 2 and the hot fluid outlet head 5 are connected, and two pads 7 are arranged between two pressure plates 6. A plurality of cold side fluid heat exchange plates and a plurality of hot side fluid heat exchange plates are alternately stacked to form a heat exchange unit module. The heat exchange unit module is located between the two pads 7. A plurality of positioning pin holes are correspondingly arranged on the pressure plate 6, the pad 7, the cold side fluid heat exchange plates, and the hot side fluid heat exchange plates. The positioning pins 11 are installed in the positioning pin holes to position and install the pressure plate 6, the pad 7, the cold side fluid heat exchange plates, and the hot side fluid heat exchange plates.

[0020] In this embodiment, two pads 7 are arranged on both sides of the outermost heat exchange unit module to seal, press and isolate the flow channel. Multiple positioning pins 11 play a role in positioning and installation. Two pressure plates 6 are arranged on the outside of the two pads 7 to fix and press all the heat exchange plates to ensure normal heat transfer between the cold side fluid heat exchange plates and the hot side fluid heat exchange plates, and no leakage of the fluid medium.

[0021] In this embodiment, the cold fluid inlet head 1, the hot fluid inlet head 2, the cold fluid outlet head 3, and the hot fluid outlet head 5 are all integrated heads formed by integrally processing flanges, flange connecting pipes and round tubes using forgings.

[0022] In this embodiment, the flow channel cross-sections on the cold side fluid heat exchange plate and the hot side fluid heat exchange plate are both semicircular structures, and the flow channels on the cold side fluid heat exchange plate and the hot side fluid heat exchange plate are processed by chemical etching. The cross-sectional dimensions and rib width L of the cold fluid side flow channel 10 on the cold side fluid heat exchange plate are different from the cross-sectional dimensions and rib width L of the hot fluid side flow channel 12 on the hot side fluid heat exchange plate; the flow channel structure on the hot fluid side heat exchange plate is a zigzag flow channel straight channel structure, and the flow channel structure on the cold fluid side heat exchange plate is a zigzag flow channel Z-shaped structure, that is, the flow channel structure on the hot fluid side heat exchange plate and the flow channel structure on the cold fluid side heat exchange plate are both zigzag flow channels in microscopic terms, and are straight channel structures and Z-shaped structures as a whole. The flow channel cross-sectional dimensions and rib width L are mainly determined based on heat transfer analysis and simulation calculations.

[0023] In this embodiment, the materials of the pressure plate 6, the pad 7, the cold side fluid heat exchange plate, the hot side fluid heat exchange plate, and the positioning pin 11 are consistent; the pressure plate 6, the pad 7, the cold side fluid heat exchange plate, and the hot side fluid heat exchange plate are the same length and width, the pad 7, the cold side fluid heat exchange plate, and the hot side fluid heat exchange plate are the same thickness, and the thickness of the pressure plate 6 is determined by checking the standard and structural calculation; the various parts of the core 4 are formed by integrally welding in a vacuum diffusion welding furnace.

[0024] In this embodiment, the assembly sequence of the core body 4 is: fix the lower pressure plate 6 → install the positioning pin 11 → install the lower pad 7 → install the hot fluid heat exchange plate 8 → install the cold fluid heat exchange plate 9 → alternately install the hot fluid heat exchange plate 8 and the cold fluid heat exchange plate 9 in sequence → install the upper pad 7 → fix the upper pressure plate 6.

[0025] In this embodiment, the cold fluid enters the cold fluid side flow channel 10 of each cold fluid heat exchange plate 9 through the cold fluid inlet head 1, and flows out from the cold fluid outlet head 3 after heat exchange; the hot fluid enters each hot fluid heat exchange plate 8 through the hot fluid inlet head 2, and flows out from the hot fluid outlet head 5 after heat exchange.

[0026] The high-efficiency and compact microchannel heat exchanger of the utility model is designed based on genetic algorithm and new concept thermal theory, and the heat transfer analysis of the internal flow field flow is carried out in combination with CFD numerical simulation results to determine the optimal heat exchange structure.

[0027] The above description is a preferred embodiment of the present invention, which is used to explain the technical solution of the present invention. Those skilled in the art can also make routine modifications, equivalent substitutions and improvements within the spirit and principles of the present invention.

Claims

1. An efficient and compact microchannel heat exchanger, comprising a core and a cold fluid inlet head, a hot fluid inlet head, a cold fluid outlet head, and a hot fluid outlet head respectively welded to the core, characterized in that: The core body includes a pressure plate, a pad, a cold side fluid heat exchange plate, a hot side fluid heat exchange plate, and a positioning pin. The flow channels arranged on the cold side fluid heat exchange plate are respectively connected with the cold fluid inlet head and the cold fluid outlet head, and the flow channels arranged on the hot side fluid heat exchange plate are respectively connected with the hot fluid inlet head and the hot fluid outlet head. Two pads are arranged between the two pressure plates. A plurality of cold side fluid heat exchange plates and a plurality of hot side fluid heat exchange plates are alternately stacked to form a heat exchange unit module. The heat exchange unit module is located between the two pads. A plurality of positioning pin holes are correspondingly arranged on the pressure plate, the pad, the cold side fluid heat exchange plate, and the hot side fluid heat exchange plate. The positioning pins are installed in the positioning pin holes to position and install the pressure plate, the pad, the cold side fluid heat exchange plate, and the hot side fluid heat exchange plate.

2. The high-efficiency compact microchannel heat exchanger according to claim 1 is characterized in that: The cold fluid inlet head, hot fluid inlet head, cold fluid outlet head and hot fluid outlet head are all integrated heads formed by integrally processing flanges, flange connecting pipes and round tubes using forgings.

3. The high-efficiency compact microchannel heat exchanger according to claim 1, characterized in that: The flow channel cross-sections on the cold side fluid heat exchange plates and the hot side fluid heat exchange plates are both semicircular structures, and the flow channels on the cold side fluid heat exchange plates and the hot side fluid heat exchange plates are both processed by chemical etching technology. The cross-sectional size and rib width of the cold fluid side flow channel on the cold side fluid heat exchange plates are different from the cross-sectional size and rib width of the hot fluid side flow channel on the hot side fluid heat exchange plates.

4. The high-efficiency compact microchannel heat exchanger according to claim 3 is characterized in that: The flow channel structure on the heat exchange plate on the hot fluid side is a zigzag flow channel straight channel structure, and the flow channel structure on the heat exchange plate on the cold fluid side is a zigzag flow channel Z-shaped structure.

5. The high-efficiency compact microchannel heat exchanger according to claim 1, characterized in that: The materials of the pressing plate, the backing plate, the cold side fluid heat exchange plate, the hot side fluid heat exchange plate and the positioning pin are consistent.

6. The high-efficiency compact microchannel heat exchanger according to claim 5, characterized in that: The pressing plate, the backing plate, the cold side fluid heat exchange plate, and the hot side fluid heat exchange plate are of the same length and width, and the backing plate, the cold side fluid heat exchange plate, and the hot side fluid heat exchange plate are of the same thickness.

Images