A microchannel air-cooled heat exchanger structure, processing method and heat exchange method

Abstract

The present invention discloses a microchannel air-cooled heat exchanger structure, a processing method and a heat exchange method, wherein the heat exchanger comprises a plurality of heat exchanger core plates, inner plates of a flow guide channel, middle plates of a flow guide channel, outer plates of a flow guide channel and a cover plate, which are stacked in sequence and welded as a whole by vacuum diffusion welding to form a microchannel air-cooled heat exchanger core structure, and a channel for cooling air circulation is cut at the top of the microchannel air-cooled heat exchanger core structure at the heat exchanger core. The heat exchanger is characterized in that no matter how the air channel is arranged, the positions of the flow holes and ribs of the high-pressure side fluid channel on each plate are consistent, so the position and size of the air channel do not affect the welding strength, and the air channel can be larger. It is more suitable for applications where the flow density and volume flow rate on both sides of the heat exchanger are greatly different.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat exchange devices, and in particular relates to a microchannel air-cooled heat exchanger structure, a processing method and a heat exchange method. Background Art

[0002] Printed circuit heat exchanger (PCHE) belongs to the category of microchannel plate heat exchanger. PCHE has the advantages of compact structure, high temperature resistance, high pressure resistance, safety and reliability, and is widely used in refrigeration and air conditioning, petroleum and natural gas, nuclear industry, chemical industry, power industry and other fields.

[0003] The common PCHE heat exchanger has similar layouts on the high temperature side and low temperature side, which is more suitable for the occasions with similar heat exchange medium density and volume flow rate on both sides. If the volume flow rate on both sides is very different, for example, one side is air with large volume flow rate, and the other side is high temperature and high pressure flow with small volume flow rate, then such layout will cause problems such as large resistance on the air side. However, it is not easy to achieve a large difference in the flow channels on both sides in traditional PCHE design and processing, otherwise the contact points of the plates on both sides and the positions of the support ribs will not match, which will easily cause welding difficulties. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a microchannel air-cooled heat exchanger structure, a processing method and a heat exchange method. After the vacuum diffusion welding of the heat exchanger core is completed, an air channel is cut from the corresponding position of the top surface of the heat exchanger. No matter how the air channel is arranged, the positions of the flow holes and ribs of the high-pressure side fluid channel on each plate are consistent. Therefore, the position and size of the air channel do not affect the welding strength, and the air channel can be larger.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A microchannel air-cooled heat exchanger structure, comprising a cover plate 5, a guide channel outer plate 4, a guide channel middle plate 3, a guide channel inner plate 2 and a plurality of heat exchanger core plates 1, wherein the plurality of heat exchanger core plates 1 are stacked front and back to form a heat exchanger core, the heat exchanger core is located in the middle, the heat exchanger core is stacked front and back with the guide channel inner plate 2, the front and rear guide channel inner plate 2 is stacked outside with the guide channel middle plate 3, and the front and rear guide channel middle plate 3 is stacked outside with the guide channel outer plate The outer plates 4 of the front and rear guide channel are stacked with cover plates 5; the cover plates 5, the outer plates 4 of the guide channel, the middle plates 3 of the guide channel, the inner plates 2 of the guide channel and several heat exchanger core plates 1 are provided with grooves or holes for the circulation of high-pressure fluid; all the above plates and cover plates are stacked in sequence and welded into a whole by vacuum diffusion welding to form a microchannel air-cooled heat exchanger core structure, and a channel for the circulation of cooling air is cut at the top of the heat exchanger core structure.

[0007] The heat exchanger core plate 1 is evenly provided with a plurality of vertical through grooves 1-1 for cooling air circulation, and the groove ribs 1-2 between the vertical through grooves 1-1 are evenly provided with a plurality of core plate small holes 1-3 for high-temperature and high-pressure fluid circulation; the inner plate 2 of the guide channel is evenly provided with a plurality of inner plate small holes 2-1 for high-temperature and high-pressure fluid circulation at positions corresponding to the core plate small holes 1-3 in the vertical direction; the middle plate 3 of the guide channel is evenly provided with a plurality of inner plate small holes 2-1 for high-temperature and high-pressure fluid circulation in the horizontal direction; A plurality of middle-layer plate horizontal through grooves 3-1 for the flow of high-temperature and high-pressure fluid are evenly opened, and the position of each middle-layer plate horizontal through groove 3-1 is consistent with the horizontal position of the plurality of inner-layer plate small holes 2-1; an outer-layer plate through groove 4-1 for the flow guide channel is opened in the middle along the vertical direction; a cover plate through hole 5-1 for the flow of high-temperature and high-pressure fluid is opened in the middle of the cover plate 5, and the position of the cover plate through hole 5-1 is located at the position of the outer-layer plate through groove 4-1.

[0008] The cooling air circulation channels cut at the heat exchanger core at the top of the overall structure are not cut at intervals of several heat exchanger core plates 1 to prevent the heat exchanger core from spreading.

[0009] The processing method of the microchannel air-cooled heat exchanger structure is as follows: since the thickness of the microchannel air-cooled heat exchanger is relatively thin, two or more microchannel air-cooled heat exchanger core structures are first welded and processed at one time in the height direction, and then a channel for cooling air circulation is cut at the heat exchanger core at the top of the microchannel air-cooled heat exchanger core structure; finally, the two or more microchannel air-cooled heat exchanger core structures processed at one time are cut into a single microchannel air-cooled heat exchanger structure.

[0010] The specific method of cutting a channel for cooling air circulation at the top of the microchannel air-cooled heat exchanger core structure is: cutting and opening the vertical through grooves 1-1 on the spaced heat exchanger core plates 1 up and down to form a channel for cooling air circulation, which is used for cooling air circulation and prevents the heat exchanger core from spreading.

[0011] The number of microchannel air-cooled heat exchanger core structures processed by one welding process is determined according to the thickness of a single heat exchanger and the size of a vacuum diffusion welding machine and an etching device.

[0012] The heat exchange method of the microchannel air-cooled heat exchanger structure is as follows: the high-temperature and high-pressure fluid to be cooled flows in from the cover plate through hole 5-1 of the front cover plate 5, diffuses up and down through the outer plate through groove 4-1, further diffuses horizontally through the middle plate horizontal through groove 3-1, and then enters the core plate small hole 1-3 through the inner plate small hole 2-1, releases heat and then flows out through the rear inner plate small hole 2-1, the middle plate horizontal through groove 3-1, the outer plate through groove 4-1 and the cover plate through hole 5-1 in sequence; the cooling air flows through the cooling air channel at the bottom of the microchannel air-cooled heat exchanger structure, horizontally flushing and cooling the high-temperature and high-pressure fluid.

[0013] The present invention has the following beneficial effects:

[0014] No matter how the air channels are arranged in the heat exchanger structure of the present invention, the positions of the flow holes and ribs of the high-pressure side fluid channels on each plate are consistent, so the position and size of the air channels do not affect the welding strength, and the air channels can be larger. It is more suitable for applications where the flow density and volume flow rate on both sides of the heat exchanger are greatly different, such as air-cooled heat exchangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the heat exchanger plate structure.

[0016] Figure 2 Schematic diagram of the heat exchanger core plate.

[0017] Figure 3 It is a partial enlarged schematic diagram of the heat exchanger core plate.

[0018] Figure 4 Schematic diagram of the inner plate of the guide channel.

[0019] Figure 5 This is a partial enlarged schematic diagram of the inner plate of the guide channel.

[0020] Figure 6 Schematic diagram of the middle plate of the diversion channel.

[0021] Figure 7 This is a partial enlarged schematic diagram of the middle layer plate of the diversion channel.

[0022] Figure 8 Schematic diagram of the outer plate of the diversion channel.

[0023] Fig. 9 Schematic diagram of the cover.

[0024] Fig.10 This is the overall schematic diagram of the heat exchanger after vacuum diffusion welding is completed.

[0025] Fig.11 This is the overall schematic diagram of the heat exchanger after the air channel is cut out.

[0026] Fig.12 This is a partial enlarged schematic diagram after the air channel is cut out.

[0027] Fig.13 Schematic diagram of a single air-cooled heat exchanger. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] like Figure 1 As shown, a microchannel air-cooled heat exchanger structure of the present invention includes a cover plate 5, a guide channel outer plate 4, a guide channel middle plate 3, a guide channel inner plate 2 and a plurality of heat exchanger core plates 1, wherein the plurality of heat exchanger core plates 1 are stacked front and back to form a heat exchanger core, the heat exchanger core is located in the middle, the heat exchanger core is stacked front and back with the guide channel inner plate 2, the front and rear guide channel inner plate 2 is stacked outside with the guide channel middle plate 3, and the front and rear guide channel middle plate 3 is stacked outside with the guide channel The outer plate 4 and the outer plate 4 of the front and rear guide channel are superimposed with a cover plate 5 on the outside; the cover plate 5, the outer plate 4 of the guide channel, the middle plate 3 of the guide channel, the inner plate 2 of the guide channel and several heat exchanger core plates 1 are provided with grooves or holes for the circulation of high-pressure fluid; all the above plates and cover plates are stacked in sequence and welded into a whole by vacuum diffusion welding to form a microchannel air-cooled heat exchanger core structure, and a channel for the circulation of cooling air is cut at the top of the heat exchanger core.

[0030] like Figure 2 and Figure 3 As shown, the heat exchanger core plate 1 is evenly provided with a plurality of vertical through grooves 1-1 for cooling air circulation in the vertical direction, and a plurality of core plate small holes 1-3 for high-temperature and high-pressure fluid circulation are evenly provided on the groove ribs 1-2 between the vertical through grooves 1-1.

[0031] like Figure 4 and Figure 5As shown, a plurality of inner plate small holes 2-1 for the flow of high-temperature and high-pressure fluid are uniformly opened on the inner plate 2 of the guide channel in the vertical direction corresponding to the positions of the core plate small holes 1-3.

[0032] like Figure 6 and Figure 7 As shown, the middle plate 3 of the guide channel is evenly provided with a plurality of middle plate horizontal through grooves 3-1 for the flow of high-temperature and high-pressure fluids in the horizontal direction, and the position of each middle plate horizontal through groove 3-1 is consistent with the horizontal position of the plurality of inner plate small holes 2-1.

[0033] like Figure 8 As shown, an outer plate through groove 4-1 for high-temperature and high-pressure fluid to flow is opened in the middle of the outer plate 4 of the guide channel along the vertical direction.

[0034] like Fig. 9 As shown, a cover plate through hole 5-1 for high-temperature and high-pressure fluid to flow is opened in the middle of the cover plate 5, and the cover plate through hole 5-1 is located at the position of the outer plate through groove 4-1.

[0035] As a preferred embodiment of the present invention, the cooling air circulation channel cut at the top of the integral structure at the heat exchanger core is not cut at intervals of several heat exchanger core plates 1 to prevent the heat exchanger core from spreading.

[0036] The processing method of the microchannel air-cooled heat exchanger structure described in the present invention is as follows: Fig.10 As shown in FIG. 1 , since the thickness of the microchannel air-cooled heat exchanger is relatively thin, two or more microchannel air-cooled heat exchanger core structures are first welded and processed in the height direction at one time, such as Fig.11 and Fig.12 As shown, a channel for cooling air circulation is then cut out at the top of the microchannel air-cooled heat exchanger core structure at the heat exchanger core; finally, two or more microchannel air-cooled heat exchanger core structures formed at one time are cut into a single microchannel air-cooled heat exchanger structure, as shown Fig.13 shown.

[0037] As a preferred embodiment of the present invention, the specific method of cutting a channel for cooling air circulation at the top of the microchannel air-cooled heat exchanger core structure at the heat exchanger core is: the vertical through grooves 1-1 on the spaced heat exchanger core plates 1 are cut up and down to form a channel for cooling air circulation, which is used for cooling air circulation and prevents the heat exchanger core from dispersing.

[0038] The present invention discloses a heat exchange method for a microchannel air-cooled heat exchanger structure, wherein the high-temperature and high-pressure fluid to be cooled flows in from the cover plate through hole 5-1 of the front cover plate 5, diffuses up and down through the outer plate through groove 4-1, further diffuses horizontally through the middle plate horizontal through groove 3-1, and then enters the core plate through the inner plate small hole 2-1. After releasing heat, it flows out through the inner plate small hole 2-1, the middle plate horizontal through groove 3-1, the outer plate through groove 4-1 and the cover plate through hole 5-1 at the rear in sequence; the cooling air flows through the cooling air channel at the bottom of the microchannel air-cooled heat exchanger structure, horizontally flushing and cooling the high-temperature and high-pressure fluid.

[0039] In the present invention, the layout position, cross-sectional shape and size of the circulation channel, the position and size of the air cooling channel, etc. can be designed according to actual needs. The number of heat exchanger cores welded at one time is also determined according to the thickness of a single heat exchanger and the size of the vacuum diffusion welding machine and etching equipment.

Claims

1. A microchannel air-cooled heat exchanger structure, characterized in that: The invention comprises a cover plate (5), an outer plate (4) of a guide channel, a middle plate (3) of a guide channel, an inner plate (2) of a guide channel and a plurality of heat exchanger core plates (1), wherein the plurality of heat exchanger core plates (1) are stacked front and back to form a heat exchanger core, the heat exchanger core is located in the middle, the inner plate (2) of the guide channel is stacked front and back on the heat exchanger core, the middle plate (3) of the guide channel is stacked outside the front and back inner plate (2), the outer plate (4) of the guide channel is stacked outside the front and back middle plate (3) of the guide channel, and the front and back inner plate (2) of the guide channel is stacked outside the front and back middle plate (3) of the guide channel. The outer plate (4) of the guide channel is then superimposed with a cover plate (5); the cover plate (5), the outer plate (4) of the guide channel, the middle plate (3) of the guide channel, the inner plate (2) of the guide channel and a plurality of heat exchanger core plates (1) are provided with grooves or holes for the circulation of high-pressure fluid; all the above plates and cover plates are superimposed in sequence and welded into an integral structure by vacuum diffusion welding to form a microchannel air-cooled heat exchanger core structure, and a channel for the circulation of cooling air is cut at the top of the heat exchanger core structure; The heat exchanger core plate (1) is evenly provided with a plurality of core plate vertical through grooves (1-1) for cooling air to flow in the vertical direction, and the groove ribs (1-2) between the core plate vertical through grooves (1-1) are evenly provided with a plurality of core plate small holes (1-3) for high-temperature and high-pressure fluid to flow in the vertical direction; the inner plate (2) of the guide channel is evenly provided with a plurality of inner plate small holes (2-1) for high-temperature and high-pressure fluid to flow in the vertical direction at positions corresponding to the core plate small holes (1-3); the middle plate (3) of the guide channel is evenly provided with a plurality of inner plate small holes (2-1) for high-temperature and high-pressure fluid to flow in the horizontal direction; A plurality of middle-layer plate horizontal through grooves (3-1) are evenly provided for the circulation of high-temperature and high-pressure fluids, and the position of each middle-layer plate horizontal through groove (3-1) is consistent with the position of the plurality of inner-layer plate small holes (2-1) in the horizontal direction; an outer-layer plate through groove (4-1) is provided in the middle of the guide channel outer-layer plate (4) in the vertical direction for the circulation of high-temperature and high-pressure fluids; a cover plate through hole (5-1) is provided in the middle of the cover plate (5) for the circulation of high-temperature and high-pressure fluids, and the position of the cover plate through hole (5-1) is located at the position of the outer-layer plate through groove (4-1); The cooling air circulation channels cut at the heat exchanger core at the top of the integral structure are not cut at intervals of several heat exchanger core plates (1), so as to prevent the heat exchanger core from being scattered.

2. The method for processing a microchannel air-cooled heat exchanger structure according to claim 1, characterized in that: Since the thickness of the microchannel air-cooled heat exchanger is relatively thin, two or more microchannel air-cooled heat exchanger core structures are first welded and processed at one time along the height direction, and then a channel for cooling air circulation is cut at the heat exchanger core at the top of the microchannel air-cooled heat exchanger core structure; finally, the two or more microchannel air-cooled heat exchanger core structures that are processed at one time are cut into a single microchannel air-cooled heat exchanger structure.

3. The processing method according to claim 2, characterized in that: The specific method for cutting a channel for cooling air circulation at the top of the microchannel air-cooled heat exchanger core structure at the heat exchanger core is: vertical through grooves (1-1) on the spaced heat exchanger core plates (1) are cut up and down to form a channel for cooling air circulation, which is used for cooling air circulation and prevents the heat exchanger core from spreading.

4. The processing method according to claim 2, characterized in that: The number of microchannel air-cooled heat exchanger core structures processed by one welding process is determined according to the thickness of a single heat exchanger and the size of a vacuum diffusion welding machine and an etching device.

5. The heat exchange method of the microchannel air-cooled heat exchanger structure according to claim 1, characterized in that: The high-temperature and high-pressure fluid to be cooled flows in from the cover plate through hole (5-1) of the front cover plate (5), diffuses up and down through the outer plate through groove (4-1), further diffuses horizontally through the middle plate horizontal through groove (3-1), and then enters the core plate small hole (1-3) through the inner plate small hole (2-1), releases heat, and then flows out through the rear inner plate small hole (2-1), the middle plate horizontal through groove (3-1), the outer plate through groove (4-1) and the cover plate through hole (5-1) in sequence; the cooling air flows through the cooling air channel at the bottom of the microchannel air-cooled heat exchanger structure, horizontally flushing and cooling the high-temperature and high-pressure fluid.

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