CN115218695A - A kind of porous flow channel heat exchanger and processing method - Google Patents

Abstract

The invention provides a heat exchanger with a porous runner and a processing method, wherein in the processing method, an upper wall runner is machined on a heat exchanger plate; preparing the porous medium particles into sticky mixed particle powder; filling the mixed particle powder into the whole upper wall surface flow passage so as to form a particle porous bonding layer in the upper wall surface flow passage in a bonding manner; and carrying out hot-pressing sintering on the single heat exchanger plate to enable the porous medium particles in the mixed particle powder and the porous medium particles to be metallurgically bonded with the inner wall of the upper wall surface flow channel so as to prepare the single-layer porous flow channel heat exchanger. The processing method provided by the invention can simultaneously complete hot-pressing sintering of the internal parts of porous medium particles, the mutual connection of heat exchanger plates and the like, so as to solve the problem that the processing difficulty is increased and the realization is difficult due to the scheme of improving the specific surface area and the heat exchange efficiency by designing the size of a small single flow passage in the prior art.

Description

A kind of porous flow channel heat exchanger and processing method

technical field

The invention belongs to the field of printed circuit board heat exchangers, relates to the processing direction of heat exchangers, and in particular relates to a multi-hole flow channel heat exchanger and a processing method.

Background technique

Heat exchange is an important link in energy transfer and conversion, which exists in many industrial production processes. The development of efficient and compact heat exchangers can help improve heat exchange performance, reduce the size of heat exchange equipment, and optimize the proportion of heat exchange systems. Space and investment costs, and at the same time play a role in energy saving and emission reduction.

Micro-channel heat exchangers represented by printed circuit board heat exchangers (PCHE) have compact structure, large specific surface area and high heat exchange efficiency, and are regarded as the first choice for efficient heat exchange in confined spaces or under high temperature and high pressure conditions.

However, PCHE mainly increases the specific surface area through a smaller flow channel size. The specific surface area of the millimeter-level flow channel PCHE can reach 5000m ² /m ³ , and the PCHE plates are mainly connected by diffusion welding. Press and place in a vacuum or reducing gas atmosphere, apply a certain temperature and pressure, and keep it for a certain time to complete the connection between the plates. The welding temperature is generally 0.5-0.8T _melting (T _melting is the melting point), and the applied pressure is small.

However, the size of a single flow channel of PCHE is so small, further reducing the size of the flow channel or changing the type of flow channel will bring difficulties to the processing, and there may be a problem of clogging of some flow channels, making it difficult to increase the specific surface area of PCHE.

SUMMARY OF THE INVENTION

The invention provides a porous flow channel heat exchanger and a processing method, so as to solve the problem of increasing the processing difficulty and even the difficulty of realizing the solution of improving the specific surface area and heat exchange efficiency through the design of a small single flow channel size in the prior art .

In a first aspect of the present invention, a method for processing a single-layer porous flow channel heat exchanger is provided, comprising:

Machined on the heat exchanger plate to form the upper wall flow channel;

The porous media particles are made into a viscous mixed particle powder;

Filling the entire upper wall surface flow channel with the mixed particle powder to form a particle porous bonding layer in the upper wall surface flow channel;

The single heat exchanger plate is hot-pressed and sintered, so that the porous media particles in the mixed particle powder and the porous media particles and the inner wall of the upper wall surface flow channel are all metallurgically bonded, thereby forming a close flow channel with the upper wall surface. The porous sintered layers of particles are combined to produce a single-layer porous channel heat exchanger.

In a second aspect of the present invention, there is provided a method for processing a multi-layer porous flow channel heat exchanger, comprising:

At least one upper wall flow channel is machined on each heat exchanger plate;

The porous media particles are made into a viscous mixed particle powder;

Filling each of the upper wall surface flow channels with the mixed particle powder to form a particle porous bonding layer in the upper wall surface flow channel;

Stack a plurality of heat exchanger plates exactly opposite each other in the order that the flow channels on the upper wall face the same direction, maintain the stability of the stacking, and apply longitudinal pressure to make close contact between adjacent heat exchanger plates , to maintain a stable and close contact state for hot-pressing sintering, so that the porous media particles in the mixed particle powder and the porous media particles and the inner wall of the upper wall surface flow channel and the lower wall surface of the adjacent heat exchanger plates are generated respectively. Metallurgically bonded to form a granular porous sintered layer that is closely combined with the upper wall flow channel and the lower wall surface of the adjacent heat exchanger plates, so as to make a multi-layer porous flow channel heat exchanger.

Further, the melting points of the porous medium particles and the heat exchanger plates are close to each other, so as to make metallurgical bonds formed by interdiffusion of atoms between the porous medium particles and the interfaces of the heat exchanger plates under hot pressing sintering.

Further, it also includes: adding a cover plate of the same material as the heat exchanger plate on the uppermost heat exchanger plate after being superimposed.

Further, at least part of the lower wall surface of the heat exchanger plate is processed with lower wall surface fins that are directly opposite to the upper wall surface flow channel, and the lower wall surface fins are used for superimposing the upper wall surface. The porous adhesive layer of particles within the flow channel exerts pressure.

Further, making the porous media particles into a viscous mixed particle powder includes:

Add plasticizers, binders and lubricants to the porous media particles, and weigh them according to the mass ratio of 80%-90% of the porous media particles and 20%-10% of the additives, and uniformly Mixing and stirring to obtain mixed granular powder;

Wherein, described plasticizer can select any one or more in paraffin wax and yellow wax;

The binder can choose any one or several of resin and polyvinyl alcohol;

The lubricant can be selected from any one or more of glycerin, stearic acid and graphite.

Further, it also includes the step of removing the air in the porous bonding layer of the particles before the hot pressing sintering:

The wall surface of the heat exchanger plate is heated to dry the porous adhesive layer of the particles, the organic solvent in the mixed particle powder is volatilized, and the air in the mixed particle powder is discharged, so that the mixed particle powder and the upper wall surface The runners are initially glued together.

In a third aspect of the present invention, there is provided a porous flow channel heat exchanger prepared based on the processing method of the above-mentioned single-layer porous flow channel heat exchanger, comprising:

heat exchanger plates;

a heat exchange channel, formed on a wall of the heat exchanger plate;

a fluid inlet, formed on the heat exchange flow channel, and the fluid inlet is used for introducing a cold fluid working medium or a hot fluid working medium;

The particle porous sintered layer is formed by hot pressing and sintering porous media particles in the heat exchange channel, and the particle porous sintered layer is metallurgically combined with the inner wall of the heat exchange channel;

Wherein, any exposed surface of the granular porous sintered layer in the heat exchange flow channel is a fluid outlet.

In a fourth aspect of the present invention, there is provided a porous flow channel heat exchanger prepared based on the above-mentioned processing method of the multi-layer porous flow channel heat exchanger, comprising:

At least two heat exchanger plates that are superimposed opposite each other;

A heat exchange flow channel is formed on the wall surface of the same side of each of the heat exchanger plates, and the heat exchange flow channel is used for introducing a fluid working medium;

The granular porous sintered layer is formed by hot pressing and sintering porous media particles in the heat exchange flow channel, and the particle porous sintered layer, the inner wall of the heat exchange flow channel, and the adjacently contacted heat exchanger plate wall surface are all uniform. metallurgical bonding;

a cover plate, which is arranged on the outermost piece of the heat exchanger plate exposed by the granular porous sintered layer, and the wall surface of the cover plate is metallurgically bonded to the granular porous sintered layer;

Wherein, the odd-numbered layers and the even-numbered layers of the heat exchanger plates in sequence are respectively passed into the fluid working medium with different cold and heat;

The heat exchanger plates of the odd-numbered layer and the even-numbered layer are each provided with a set of fluid inlets and fluid outlets that communicate with all the heat-exchange flow channels into which the same fluid working medium is passed.

Further, all the heat exchanger plates except the outermost heat exchanger plates and the cover plate are provided with fins that are directly opposite to the heat exchange channels, and the fins are for compressing the granular porous sintered layer in the heat exchange flow channel;

Wherein, the fins are an integral structure matched with the heat exchange flow channel, or a plurality of fins are intermittently arranged along the direction of the heat exchange flow channel.

Compared with the prior art, the present invention has the following beneficial effects:

The processing method of the porous flow channel heat exchanger (single-layer or multi-layer) provided by the present invention mainly includes machining the flow channel on the heat exchanger plate, applying the porous medium particles in the flow channel, and making the flow channel through the hot pressing sintering process. The metallurgical bond formed by the mutual diffusion of atoms between the porous media particles and the interface of the heat exchanger plate improves the specific surface area and heat exchange efficiency of a single flow channel and the entire heat exchanger plate without excessively reducing the flow channel. size increases the difficulty of processing.

The porous flow channel heat exchanger (single-layer or multi-layer) disclosed in the present invention utilizes the metallurgical bonding characteristics of the material structure between the heat exchanger plate and the granular porous sintered layer, thereby improving the single flow channel and the entire heat exchanger. Plate specific surface area and heat transfer efficiency.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be derived from the provided drawings without any creative effort.

Fig. 1 is the example diagram of the porous flow channel heat exchanger in the embodiment 2 of the present invention;

Fig. 2 is the A-A cross-sectional schematic diagram of Fig. 1 in embodiment 2 of the present invention;

Fig. 3 is the B-B sectional view of Fig. 1 in the embodiment 2 of the present invention;

Labels in the figure:

1 and 3 are fluid inlets, 2 and 4 are fluid outlets, 5 is a cover plate, 6 is a heat exchange channel, 7 is a heat exchanger plate, and 8 is a rib.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The invention provides a porous flow channel heat exchanger and a processing method, which mainly process flow channels on a heat exchanger plate and combine the characteristics of porous medium particles to form porous medium particles in the flow channel by sintering, using the porous medium The material properties of the particles and the walls of the heat exchanger plates are metallurgically bonded by hot pressing sintering.

The porous medium can form interconnected pores in the flow channel, and the heat exchange between the two heat exchange working fluids can be realized by filling the porous medium particles in the flow channel. The fluid working medium has good fluidity in the porous medium, the specific surface area of the porous medium is large, and the thermal conductivity is good, which can effectively strengthen the heat exchange. The multi-channel heat exchanger and its processing method provided by the present invention improve the specific surface area and heat exchange efficiency of a single flow channel and the entire heat exchanger plate; Defects in heat exchange efficiency (excessive reduction, difficult processing, and easy to cause problems such as blockage).

Based on the basic scheme of the above-mentioned porous flow channel heat exchanger and processing method, several embodiments are provided below:

Example 1

The present embodiment provides a processing method for directly processing a multi-channel heat exchanger with a single-layer heat exchanger plate, the details are as follows:

Machined on the heat exchanger plate to form the upper wall flow channel;

The porous media particles are made into a viscous mixed particle powder;

Filling the entire upper wall surface flow channel with the mixed particle powder to form a particle porous bonding layer in the upper wall surface flow channel;

The single heat exchanger plate is hot-pressed and sintered, so that the porous media particles in the mixed particle powder and the porous media particles and the inner wall of the upper wall surface flow channel are all metallurgically bonded, thereby forming a close flow channel with the upper wall surface. The porous sintered layers of particles are combined to produce a single-layer porous channel heat exchanger.

In the preparation process of the upper wall flow channel, the size of the upper wall flow channel is first determined according to the actual heat exchange requirements. The flow channel structure and size of the cold and hot side heat exchanger plates can be the same or different. The viscosity of the fluid working medium changes. When the viscosity of the fluid working medium is high, the size of the flow channel on the upper wall can be appropriately increased to reduce the resistance generated during the flow of the fluid working medium.

There is no specific restriction on the form of the flow channel, any cross-sectional shape of the flow channel, and the flow channel can be straight or curved, and can form a combination of multiple flow channels or a tree-like branch structure. The relationship between adjacent flow channels can be parallel or any other relationship; in order to facilitate processing, it is generally preferred that the cross-sectional shape of the flow channel can be rectangular, trapezoidal, triangular or semicircular, etc., and the flow channel is straight or regular. Curve type, the same heat exchanger plate is designed for parallel or regular or symmetrical distribution.

In general, the width of the upper wall flow channel is preferably 1mm-1m, the depth is preferably 1mm-100mm, and the rib width between adjacent flow channels is preferably 1-100mm, which is determined according to the actual heat exchange requirements.

After the size of the flow channel on the upper wall is determined, the processing method of the flow channel is preferably realized by etching method or mechanical processing method (milling, wire cutting), and the processed heat exchanger plate is soaked in cleaning agent or organic solvent ultrasonic cleaning (5min). ), dry with cold air, remove oil stains, burning marks and impurities on the inner wall of the upper wall flow channel, and complete the preparation process of the upper wall surface flow channel.

In the process of preparing the particle porous adhesive layer, the particle size, shape and material type of the porous media particles are selected according to the size of the upper wall surface flow channel and the required porosity.

The shape of the porous medium particles is generally spherical, elliptical or other shapes, and the particle size is 1 μm-5 mm. In order to maintain the integrity of the pore structure, close fusion between particles, and reduce the proportion of closed pores, porous media particles with smooth surface and uniform particle size are generally preferred.

Porous medium particles and heat exchanger plates can be of the same metal material, or of dissimilar metal materials with similar melting points, and the particles can also be made of non-metallic materials.

In the case where the heat exchanger plates and particles are of different materials, the melting points of the two materials must be close to each other, and there is an intersection in the _melting temperature range of 0.7-0.8T. The pressure is determined according to the material, which can ensure that the porous media particles and heat exchange Whether the heat exchanger plate is of the same metal or dissimilar material, the metallurgical bond formed by the mutual diffusion of atoms between the porous media particles and the interface of the heat exchanger plate under hot pressing sintering.

Among them, the common materials of heat exchanger plates and particles are copper, aluminum, iron, nickel, stainless steel, other alloys, inorganic non-metals, etc. The melting point of copper is 1083 ° C, the melting point of aluminum is 660 ° C, the melting point of iron is 1583 ° C, and the melting point of nickel is 1583 ° C. 1453 ° C, the melting point of 304 stainless steel is 1398-1454 ° C, the actual processing includes but is not limited to the above materials.

Wherein, the method for making the porous media particles into a viscous mixed particle powder is as follows:

First, after selecting particles of suitable particle size with a screen, they were placed in anhydrous ethanol for ultrasonic cleaning for 30 minutes, and the cleaned particles were placed in an oven and dried at 60°C for 10 minutes.

The particles are then treated in an acidic aqueous solution and left to dry. Appropriate amount of additives, including plasticizers, binders and lubricants, need to be added to the granules, weighed according to the ratio of 80%-90% of the granules and 20%-10% of the additives, and uniformly mixed and stirred to make a viscous mixed granule powder body.

The plasticizer can be selected from paraffin, yellow wax, etc., the binder can be selected from resin, polyvinyl alcohol, etc., and the lubricant can be selected from glycerin, stearic acid, graphite, etc.

When the mixed particle powder is filled in the upper wall surface flow channel to form the particle porous adhesive layer, its surface is generally difficult to keep flat due to operational problems. Therefore, in a preferred embodiment, a clamp can be used along the upper wall surface of the heat exchanger plate. Rubbing back and forth keeps the outer surface of the porous adhesive layer of the particles in the flow channel on the upper wall in a flat and compacted state.

In a preferred embodiment, the air in the particulate porous adhesive layer is removed before hot pressing sintering, specifically by heating the wall surface of the heat exchanger plate to dry the particulate porous adhesive layer.

Specifically, a hot air spray gun is generally used to heat the lower wall surface (the side wall surface can also be selected) of the plate, and the temperature is about 120 ° C to accelerate the drying of the mixed particle powder, and the organic solvent in the mixed particle powder is accelerated to volatilize and is discharged from the powder. air, so that the mixed particle powder in the particle porous bonding layer and the upper wall surface flow channel are more closely bonded.

In this embodiment, a single heat exchanger plate can be fixed in a high temperature and high pressure adjustable environment for hot pressing sintering, or a single heat exchanger plate can be assembled in a high temperature resistant fixture and built in a high temperature and high pressure adjustable environment for sintering. Hot-press sintering (but at this time, the granular porous adhesive layer on the wall surface of the single heat exchanger plate is generally arranged not to contact the fixture).

Among them, the melting point and chemical properties of the material of the high temperature resistant fixture, the heat exchanger plate and the porous medium particle material are quite different, so as to avoid the diffusion between atoms, resulting in the high temperature resistant fixture, the heat exchanger plate and the porous medium. Fusion between particles occurs.

The specific method of hot pressing sintering of a single heat exchanger plate is as follows:

A single heat exchanger plate is assembled in a high temperature resistant fixture, and then placed in a hot pressing furnace, maintaining a vacuum atmosphere (vacuum degree below 5×10 ^-2 Pa) or a reducing gas atmosphere (nitrogen-hydrogen mixed gas), and the furnace is heated up The rate was 10°C/min, and the pressure was applied by the pressing member.

Heat preservation for 10-15min in the range of 0.4-0.45T _melting temperature; heat up to 0.6-0.65T _melting , heat preservation for 10min, then heat up to 0.7-0.75T _melting , heat preservation and pressure for 20-25min, and then slowly cool to 100℃-150℃ Next, take out the fixture. At this time, metallurgical bonding occurs between the porous media particles and between the porous media particles and the inner wall of the upper wall surface flow channel to obtain a single-layer porous flow channel heat exchanger.

The processed porous flow channel heat exchanger will have some burrs and impurities on the surface of the porous structure, which will fall off under the flow impact of the working medium for a long time. There is a risk of contaminating the working medium and blocking the flow channel, and surface treatment is required.

The internal structure of porous materials is complex, and electrochemical corrosion can be used as a surface treatment method for porous materials. The metal with more active chemical properties than the heat exchanger material is used as the cathode, the treated porous channel heat exchanger is used as the anode, and the electrolyte is an acidic solution. A small amount of water can be added to the electrolyte to improve the conductivity of the solution, control the concentration and The corrosion time can avoid damage to the basic structure of the porous material on the basis of ensuring the treatment effect of burrs and impurities.

In this embodiment, the porous flow channel heat exchanger is integrally formed by hot pressing and sintering during the processing of the porous flow channel heat exchanger. The prepared porous flow channel heat exchanger changes the form and processing method of the existing heat exchanger, and improves the heat exchange ratio. At the same time, it is not necessary to reduce the size of the flow channel excessively. When the heat exchanger plates and porous media are made of different materials, the advantages of different materials can be used at the same time. Further, only by machining the flow channel and hot pressing sintering The technology can be completed, and the processing difficulty is relatively low.

Example 2

This embodiment provides a porous channel heat exchanger (single-layer) processed and prepared based on the processing method provided in Embodiment 1. An example diagram of the heat exchanger is shown in Figure 1. For the schematic diagram of the structure of the heat exchanger plate, please refer to Figure 2. And Figure 3 (you can refer to the single-layer heat exchanger plate structure in the figure, there is no fin structure in Embodiment 2), the structure includes:

heat exchanger plate 7;

The heat exchange channel 6 is formed on a wall of the heat exchanger plate 7;

The fluid inlet 1 or 3 is formed on the heat exchange flow channel 6, and the fluid inlet 1 or 3 is used for introducing a cold fluid working medium or a hot fluid working medium;

The granular porous sintered layer is formed by hot-pressing sintering of porous media particles in the heat exchange channel 6, and the granular porous sintered layer is metallurgically bonded to the inner wall of the heat exchange channel 6;

Wherein, the exposed surface of the granular porous sintered layer in the heat exchange flow channel is the fluid outlet 2 or 4 anywhere.

In the above heat exchange flow channel, the flow direction shape of the flow channel is not limited, and can be straight or tortuous along the flow direction; The specific flow direction shape and cross-sectional shape can be selected according to the heat exchange requirements, and different flow directions and cross-sectional shapes do not affect the smooth flow of the fluid working medium in the flow channel.

The single-layer heat exchanger provided in this embodiment is equivalent to using the exposed particle porous sintered layer as the fluid outlet and the heat exchange interface, which can also improve the heat exchange efficiency.

Example 3

This embodiment provides a processing method (multi-layer) of a porous flow channel heat exchanger, which is different from Embodiment 1 in that it includes:

At least one upper wall flow channel is machined on each heat exchanger plate;

The porous media particles are made into a viscous mixed particle powder;

Filling each of the upper wall surface flow channels with the mixed particle powder to form a particle porous bonding layer in the upper wall surface flow channel;

Stack a plurality of heat exchanger plates exactly opposite each other in the order that the flow channels on the upper wall face the same direction, maintain the stability of the stacking, and apply longitudinal pressure to make close contact between adjacent heat exchanger plates , to maintain a stable and close contact state for hot-pressing sintering, so that the porous media particles in the mixed particle powder and the porous media particles and the inner wall of the upper wall surface flow channel and the lower wall surface of the adjacent heat exchanger plates are generated respectively. Metallurgically bonded to form a granular porous sintered layer that is closely combined with the upper wall flow channel and the lower wall surface of the adjacent heat exchanger plates, so as to make a multi-layer porous flow channel heat exchanger.

Further, a cover plate of the same material as the heat exchanger plate is installed on the uppermost heat exchanger plate after being superimposed, so as to form a metallurgical bond with the heat exchanger plate on the top layer.

In order to make the connection between the mixed particle powder and the flow channel and the lower wall surface of the adjacent heat exchanger plates more closely, at least part of the lower wall surface of the heat exchanger plate is processed with the flow channel on the upper wall surface. The opposite lower wall surface fins are used for applying pressure to the particle porous adhesive layer in the upper wall surface flow channel after being superimposed.

This is equivalent to using the lower wall fins as a part of the outwardly protruding part of the heat exchanger plate integrally formed. In this way, it can not only compress the mixed particle powder during stacking, but also increase the number of adjacent heat exchangers. The tightness of the connection between the plates.

The specific hot pressing sintering method of the multi-layer heat exchanger is as follows:

Assemble the superimposed heat exchanger plates in a high temperature resistant fixture, and then place them in a hot press furnace to ensure that the high temperature resistant fixture is placed between the upper and lower pressing parts, and maintain a vacuum atmosphere (vacuum degree 5×10 ^-2 Pa below) or reducing gas atmosphere (nitrogen-hydrogen mixed gas), the heating rate in the furnace is 10°C/min, and the pressure is applied by the pressing member.

Apply a pre-pressure of 1.5-2MPa to the structure in the furnace, and keep it in the _melting temperature range of 0.4-0.45T for 10-15min; adjust the pressure to 8-10MPa, heat up to 0.6-0.65T _melting , hold for 10min, and then heat up to 0.7-0.75 T _melting , heat preservation and pressure for 20-25min, release the pressure after heat preservation and pressure, slowly cool to below 100℃-150℃, take out the mold, and obtain the welded part. Metallurgical bonding occurs between the inner walls to obtain a multi-layer porous flow channel heat exchanger.

Among them, after the heat exchanger plate is processed into the upper wall surface flow channel, the surface to be welded of the heat exchanger plate is ground with sandpaper, and the roughness of the to-be-welded surface is controlled within the precision range required by diffusion welding (0.8-1.6 μm). Soak the processed heat exchanger plates in cleaning agent or organic solvent for ultrasonic cleaning (5min), and dry with cold air to remove oil stains, burning marks and impurities on the surface of the flow channel and the surface to be welded.

Then, the mixed particle powder is prepared according to the steps in Example 1, and the upper wall surface flow channels of the prepared plurality of heat exchanger plates are filled with the mixed particle powder and bonded to form a particle porous adhesive layer. The heat exchanger plates are superimposed in the same direction in the order that the upper wall surface flow channels face the same direction, and are hot-pressed and sintered to make a multi-layer porous flow channel heat exchanger. The hot-pressing sintering process and the post-sintering treatment steps in this embodiment are the same as the hot-pressing sintering process and the surface treatment of the porous channel heat exchanger in Embodiment 1, and will not be repeated here.

In addition, in this Example 3, before or after hot-pressing sintering, a cover plate of the same material as the heat exchanger plate is installed on the uppermost heat exchanger plate after lamination, so as to ensure the heat exchanger. The outer surface is horizontally sealed for easy use.

Although there are similarities between this Example 3 and Example 1, this Example 3 is not obtained based on the simple transformation of Example 1. The single-layer heat exchanger proposed in Example 1 is based on Example 3, and No direct technical inspiration can be obtained, it belongs to a new technical solution.

Example 4

This embodiment provides a porous flow channel heat exchanger (multi-layer) processed and prepared based on the processing method provided in Example 3, an example diagram of which is shown in Figure 1, and a schematic diagram of the structure of the heat exchanger plate can refer to Figure 2 And Figure 3 (the structure without rib 8 in this embodiment 4), the structure includes:

At least two heat exchanger plates 7 that are superimposed opposite each other;

The heat exchange flow channel 6 (equivalent to the upper wall surface flow channel) is formed on the wall surface on the same side of each of the heat exchanger plates 7, and the heat exchange flow channel 6 is used to pass the fluid working medium;

The granular porous sintered layer is formed by hot-pressing sintering of porous media particles in the heat exchange channel 6. The granular porous sintered layer is connected to the inner wall of the heat exchange channel 6 and the adjacent heat exchanger plates in contact with each other. The walls of sheet 7 are homometallurgically bonded;

The cover plate 5 is arranged on the outermost piece of the heat exchanger plate 7 exposed by the granular porous sintered layer, and the wall surface of the cover plate 5 is metallurgically bonded to the granular porous sintered layer;

Wherein, the said heat exchanger plates 7 of the odd-numbered layers and the even-numbered layers in sequence are respectively passed into the fluid working medium with different cold and heat;

The odd-numbered and even-numbered layers of the heat exchanger plates are each provided with a set of fluid inlets 1 or 3 and fluid outlets 2 or 4 that communicate with all the heat exchange channels into which the same fluid working medium is passed.

The single-layer heat exchanger is mainly used for cooling the heat exchange structure. When the working medium passes through the porous medium, the thermal structure is cooled in the form of sweat cooling and air film cooling. The multi-layer heat exchanger is mainly used for the efficient heat exchange of two media, and the heat is transferred from the high temperature medium to the low temperature medium.

Further, all the heat exchanger plates 7 and the cover plate 5 except the outermost heat exchanger plates 7 are provided with fins 8 that are directly opposite to the heat exchange channels, The fins 8 are used to compress the porous sintered layer of particles in the heat exchange channel 6 .

Wherein, the fins 8 are of an integral structure matching the heat exchange flow channel 6, or a plurality of them are intermittently arranged along the direction of the heat exchange flow channel.

Intermittent setting is the preferred solution, mainly because the granular porous sintered layer in the heat exchange flow channel (upper wall flow channel) has a viscous structure between formations and has a certain fluidity. It is difficult to ensure complete smoothness during processing and filling. A perfectly matched overall structure may result in a difficult flattening situation.

The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims (10)

1. a processing method of a porous flow channel heat exchanger, is characterized in that, comprising: Machined on the heat exchanger plate to form the upper wall flow channel; The porous media particles are made into a viscous mixed particle powder; Filling the entire upper wall surface flow channel with the mixed particle powder to form a particle porous bonding layer in the upper wall surface flow channel; The single heat exchanger plate is hot-pressed and sintered, so that the porous media particles in the mixed particle powder and the porous media particles and the inner wall of the upper wall surface flow channel are all metallurgically bonded, thereby forming a close flow channel with the upper wall surface. The porous sintered layers of particles are combined to produce a single-layer porous channel heat exchanger. 2. A processing method of a multi-hole flow channel heat exchanger, characterized in that, comprising: At least one upper wall flow channel is machined on each heat exchanger plate; The porous media particles are made into a viscous mixed particle powder; Filling each of the upper wall surface flow channels with the mixed particle powder to form a particle porous bonding layer in the upper wall surface flow channel; Stack a plurality of heat exchanger plates exactly opposite each other in the order that the flow channels on the upper wall face the same direction, maintain the stability of the stacking, and apply longitudinal pressure to make close contact between adjacent heat exchanger plates , to maintain a stable and close contact state for hot-pressing sintering, so that the porous media particles in the mixed particle powder and the porous media particles and the inner wall of the upper wall surface flow channel and the lower wall surface of the adjacent heat exchanger plates are generated respectively. Metallurgically bonded to form a granular porous sintered layer that is closely combined with the upper wall flow channel and the lower wall surface of the adjacent heat exchanger plates, so as to make a multi-layer porous flow channel heat exchanger. 3. The processing method according to claim 1 or 2, characterized in that, The melting point of the porous medium particles and the heat exchanger plates is close to the metallurgical bond formed by interdiffusion of atoms between the porous medium particles and the interfaces of the heat exchanger plates under hot pressing sintering. 4. processing method according to claim 2, is characterized in that, also comprises: A cover plate of the same material as the heat exchanger plate is installed on the uppermost heat exchanger plate after being superimposed. 5. The processing method according to claim 2, characterized in that, At least part of the lower wall surface of the heat exchanger plates is processed with lower wall surface fins that are directly opposite to the upper wall surface flow channel, and the lower wall surface fins are used for superimposing the surface of the upper wall surface. The particulate porous adhesive layer applies pressure. 6. The processing method according to claim 1 or 2, wherein the step of making the porous media particles into a viscous mixed particle powder comprises: Add plasticizers, binders and lubricants to the porous media particles, and weigh them according to the mass ratio of 80%-90% of the porous media particles and 20%-10% of the additives, and uniformly Mixing and stirring to obtain mixed granular powder; Wherein, described plasticizer can select any one or more in paraffin wax and yellow wax; The binder can choose any one or several of resin and polyvinyl alcohol; The lubricant can be selected from any one or more of glycerin, stearic acid and graphite. 7. The processing method according to claim 6, further comprising the step of removing the air in the porous bonding layer of the particles before hot-pressing sintering: The wall surface of the heat exchanger plate is heated to dry the porous adhesive layer of the particles, the organic solvent in the mixed particle powder is volatilized, and the air in the mixed particle powder is discharged, so that the mixed particle powder and the upper wall surface The runners are initially glued together. 8. A porous flow channel heat exchanger according to claim 1, characterized in that, comprising: heat exchanger plate (7); A heat exchange channel (6) is formed on a wall of the heat exchanger plate (7); a fluid inlet (1 or 3), formed on the heat exchange flow channel (6), and the fluid inlet (1 or 3) is used for introducing a cold fluid working medium or a hot fluid working medium; The granular porous sintered layer is formed by hot-pressing and sintering porous media particles in the heat exchange channel (6), and the granular porous sintered layer is metallurgically bonded to the inner wall of the heat exchange channel (6); Wherein, any exposed surface of the porous sintered layer of particles in the heat exchange flow channel (6) is a fluid outlet (2 or 4). 9. A porous flow channel heat exchanger according to claim 2, characterized in that, comprising: At least two heat exchanger plates (7) that are superimposed on each other; A heat exchange flow channel (6) is formed on the wall surface of each of the heat exchanger plates (7) on the same side, and the heat exchange flow channel (6) is used for introducing a fluid working medium; The particle porous sintered layer is formed by hot pressing and sintering porous media particles in the heat exchange flow channel (6), and the particle porous sintered layer is connected to the inner wall of the heat exchange flow channel (6) and the adjacent contact The walls of the heat exchanger plates (7) are homometallurgically bonded; a cover plate (5), which is arranged on the outermost piece of the heat exchanger plate (7) exposed by the granular porous sintered layer, and the wall surface of the cover plate (5) is metallurgically bonded to the granular porous sintered layer; Wherein, the odd-numbered layers and the even-numbered layers of the heat exchanger plates (7) in sequence are respectively introduced into fluid working medium with different cold and heat; The heat exchanger plates (7) of the odd-numbered layers and the even-numbered layers are each provided with a set of fluid inlets (1 or 3) and fluid outlets (2 or 4) that communicate with all the heat exchange flow passages that pass into the same fluid working medium. . 10. The porous flow channel heat exchanger according to claim 9, characterized in that, All the heat exchanger plates except the outermost heat exchanger plates and the cover plate are provided with fins (8) that are directly opposite to the heat exchange channels (6), so The fins (8) are used for compressing the granular porous sintered layer in the heat exchange flow channel (6); Wherein, the fins (8) are an integral structure matching with the heat exchange flow channel (6), or a plurality of them are intermittently arranged along the direction of the heat exchange flow channel (6).

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