CN215176190U - Micro-channel heat exchanger - Google Patents

Abstract

The utility model provides a microchannel heat exchanger comprises left pressure manifold, right pressure manifold, many parallel arrangement's the flat pipe of microchannel, fin, sideboard, end cover, import pipe, outlet pipe, baffle, molecular sieve post etc.. The molecular sieve column is a porous cylinder or a porous square column which is formed by sintering or pressing a molecular sieve with strong water absorption capacity, is arranged in the left collecting pipe or the right collecting pipe and is positioned at the lower part of the left collecting pipe or the right collecting pipe. The refrigerant has to flow through the molecular sieve column before flowing out of the microchannel heat exchanger through the outlet pipe, so that the drying and filtering of moisture and impurities in the refrigerant are realized while the heat exchange is completed. The utility model discloses the main design is used for miniature refrigerating system, owing to be in the same place drying, filtration and heat transfer function integration, does not need to set up the great dry filtration device of volume in addition, therefore has reduced shared volume and weight of relevant device and attached pipeline, helps constructing littleer lighter miniature refrigerating system.

Description

Micro-channel heat exchanger

Technical Field

The utility model relates to a heat exchanger specifically is a microchannel heat exchanger that can be used to heat transfer between refrigerant and the air.

Background

In recent years, there have been increasing numbers of micro-refrigeration apparatuses using a vapor compression refrigeration cycle. These micro-refrigeration devices include: portable refrigeration devices, wearable refrigeration devices, embedded refrigeration devices, and the like. Like a conventional vapor compression refrigeration device, the micro vapor compression refrigeration device also comprises main refrigeration components such as a compressor, a condenser, an evaporator and the like; however, unlike conventional refrigeration devices, micro-refrigeration devices require the volume of the refrigeration components to be as small as possible to meet the operational requirements of portability. By adopting the micro refrigeration compressor with high rotating speed and adopting the micro-channel condenser and the micro-channel evaporator with higher heat exchange efficiency, the volume of three main refrigeration parts can be effectively reduced. However, it is not sufficient to reduce the volume of the main refrigeration component for the entire micro-refrigeration system, and it is also necessary to try to reduce the volume of other auxiliary components in the refrigeration system, such as the volume of the dry filter. The dry filter is essential for the refrigeration system, can filter impurities such as particles and the like in the refrigerant, adsorbs water in the refrigerant, and plays an important role in maintaining the long-term stable operation of the refrigeration system. In conventional refrigeration systems, the volume of the filter-drier is negligible compared to the volume of the other components; but for miniature refrigeration systems the volume of the dry filter cannot be neglected. The presence of the dry filter, and the connecting lines attached to it, will increase the volume of the entire micro-refrigeration system by about 10%. In order to further reduce the volume of the micro-refrigeration system, the implementation of the refrigerant drying and filtering must be improved.

Disclosure of Invention

The utility model discloses the drier-filter who exists occupies the more problem of volume among the miniature refrigerating system to current, for further reducing miniature refrigerating system's volume, provided a novel microchannel heat exchanger.

The microchannel heat exchanger comprises a left collecting pipe, a right collecting pipe, a plurality of microchannel flat pipes arranged in parallel, fins, side plates, end covers, an inlet pipe, an outlet pipe, a partition plate, a molecular sieve column and the like. The molecular sieve column is arranged in the right collecting pipe and is positioned at the lower part of the right collecting pipe.

The left collecting pipe and the right collecting pipe are round pipes or square pipes with equal length, and the left collecting pipe and the right collecting pipe are respectively positioned on two sides of the micro-channel heat exchanger.

The micro-channel flat tubes arranged in parallel are metal flat tubes with micro-channels inside, and the thickness of the micro-channels is usually less than 1 mm. The lengths of the micro-channel flat tubes are the same, the cross sections of the micro-channel flat tubes are the same, and the distances among the micro-channel flat tubes are the same. One end of each micro-channel flat tube is inserted into the left collecting pipe together and is vertical to the axis of the left collecting pipe; the other ends of the micro-channel flat tubes are inserted into the right collecting pipe together and are perpendicular to the axis of the right collecting pipe. The microchannel in the microchannel flat tube is a flow channel for circulating the refrigerant.

The side plates are parallel to the micro-channel flat tubes. The side plates are two in number, one side plate is located above the uppermost micro-channel flat tube and is flush with the upper ends of the left collecting pipe and the right collecting pipe, and the other side plate is located below the lowermost micro-channel flat tube and is flush with the lower ends of the left collecting pipe and the right collecting pipe.

The fins are positioned between the micro-channel flat tubes which are parallel to each other and between the micro-channel flat tubes and the side plates. The fins are corrugated fins, and the fins can be windowed or not windowed. And air circulation channels are formed among the fins, and the air circulation direction is vertical to the refrigerant circulation direction.

The number of the end covers is 4, and the 4 end covers are respectively positioned at the top of the left collecting pipe, the bottom of the left collecting pipe, the top of the right collecting pipe and the bottom of the right collecting pipe, so that two ends of the left collecting pipe and the right collecting pipe are blocked.

The number of the partition plates is more than or equal to 1, and the partition plates are respectively inserted into the left collecting pipe and the right collecting pipe so as to divide the interior of the left collecting pipe and the interior of the right collecting pipe into a plurality of pipe sections.

The inlet pipe is arranged at the upper part of the left collecting pipe and is positioned below the top end cover of the left collecting pipe and above the uppermost partition plate of the left collecting pipe.

The outlet pipe is arranged on the lower portion of the right collecting pipe and is located above the bottom end cover of the right collecting pipe and below the lowest partition plate of the right collecting pipe.

The molecular sieve column is a porous cylinder or a porous square column which is formed by sintering or pressing a molecular sieve with strong water absorption capacity. The molecular sieve column is positioned in the right collecting pipe and is positioned in a pipe section which is above the bottom end cover of the right collecting pipe and above the lowest clapboard of the right collecting pipe.

The partition plate enables the refrigerant to flow into the left collecting pipe of the microchannel heat exchanger from the inlet pipe, then to be subjected to multiple baffling when flowing through the microchannel flat pipe, and finally to flow out of the lowest pipe section of the right collecting pipe. Because the molecular sieve column is arranged in the pipe section at the lowest part of the right collecting pipe, when the refrigerant flows through the molecular sieve column, moisture contained in the refrigerant is adsorbed by the molecular sieve, and the refrigerant is dried; and because the molecular sieve column has a porous structure, only the refrigerant can flow through the molecular sieve column, but impurities in the refrigerant cannot flow through the molecular sieve column, so that the molecular sieve column simultaneously plays a role in filtering the impurities in the refrigerant.

Optionally, when the number of the partition plates is odd, the outlet pipe is arranged at the lower part of the left collecting pipe, and the outlet pipe is located above the bottom end cover of the left collecting pipe and below the lowest partition plate of the left collecting pipe. Correspondingly, the molecular sieve column is positioned at the lower part of the left collecting pipe and is positioned in a pipe section which is above the bottom end cover of the left collecting pipe and below the lowest clapboard of the left collecting pipe.

Microchannel heat exchanger realized two kinds of functions of dry filtration of heat transfer and refrigerant simultaneously in same part, need not set up independent dry filter and corresponding connecting line in addition in the pipeline outside the heat exchanger, therefore help reducing miniature refrigerating system's volume to pipeline solder joint and the quantity of potential leak source help improving refrigerating system's reliability in the reducible system. The vapor compression type refrigerating system can be used for various miniature vapor compression type refrigerating systems, such as a portable refrigerating system, an embedded refrigerating system, a wearable refrigerating system and the like.

Drawings

Fig. 1 is an exploded view of the microchannel heat exchanger.

Fig. 2 is a structural sectional view of the microchannel heat exchanger.

Fig. 3 is an external perspective view of the channel heat exchanger.

FIG. 4 is a cross-sectional view of another alternative embodiment of the microchannel heat exchanger.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, fig. 2 and fig. 3, according to an embodiment of the present invention, the microchannel heat exchanger 100 includes a left collecting pipe 1, a right collecting pipe 2, a plurality of microchannel flat pipes 3 arranged in parallel, fins 4, a side plate 5, an end cover 6, an end cover 7, an end cover 8, an end cover 9, an inlet pipe 10, an outlet pipe 11, a partition plate 12, a partition plate 13, and a molecular sieve column 14. Except for the molecular sieve column 14, all the parts are metal parts, and all the metal parts are integrated into a whole through integral brazing.

The left collecting pipe 1 and the right collecting pipe 2 are equal-length circular pipes or square pipes (circular pipes in this embodiment). The left collecting pipe 1 and the right collecting pipe 2 are respectively located on two sides of the microchannel heat exchanger 100.

The plurality of microchannel flat tubes 3 arranged in parallel are flat tubes with microchannels inside, and the thickness of the microchannels is usually less than 1 mm. The micro-channel flat tubes 3 are the same in length, the same in cross-sectional shape and the same in spacing. One end of each of the micro-channel flat tubes 3 is commonly inserted into the left collecting pipe 1 and is perpendicular to the axis of the left collecting pipe 1; the other ends of the micro-channel flat tubes 3 are inserted into the right collecting pipe 2 together and are perpendicular to the axis of the right collecting pipe 2. The micro-channel in the micro-channel flat tube 3 is a flow channel for the circulation of the refrigerant.

The side plates 5 are parallel to the micro-channel flat tubes 3. The side plates 5 are two in total, one of the side plates is positioned above the uppermost micro-channel flat tube and is flush with the upper ends of the left collecting pipe and the right collecting pipe, and the other side plate is positioned below the lowermost micro-channel flat tube and is flush with the lower ends of the left collecting pipe and the right collecting pipe.

The fins 4 are positioned between the micro-channel flat tubes 3 which are parallel to each other, and between the micro-channel flat tubes 3 and the side plates 5. The fins 4 are corrugated fins. And air flow channels are formed among the fins 4, and the air flow direction is vertical to the refrigerant flow direction.

The end cover 6 and the end cover 7 respectively block two ends of the left collecting pipe 1; and the end covers 8 and 9 respectively block two ends of the right collecting pipe 2. End cover 6 is the left header top end cover, end cover 7 is the left header bottom end cover, end cover 8 is the right header top end cover, and end cover 9 is the right header bottom end cover.

The partition plate 12 is inserted into the left header 1, so as to divide the left header 1 into two pipe sections: the pipe section between the end cover 6 and the partition plate 12 is the upper pipe section 1a of the left collecting pipe, and the pipe section between the partition plate 12 and the end cover 7 is the lower pipe section 1b of the left collecting pipe.

The partition plate 13 is inserted into the right header 2, so as to divide the right header 2 into two pipe sections: the tube section between the end cover 8 and the baffle 13 is the upper tube section 2a of the right header, and the tube section between the baffle 13 and the end cover 9 is the lower tube section 2b of the right header.

The inlet pipe 10 is communicated with the left collecting pipe 1, and the inlet pipe 10 is located below a top end cover (i.e., the end cover 6) of the left collecting pipe 1 and above an uppermost partition plate (i.e., the partition plate 12) of the left collecting pipe 2 (i.e., the pipe section 1 a).

The outlet pipe 11 is communicated with the right collecting pipe 2, and the outlet pipe 11 is positioned on a pipe section (namely, a pipe section 2b) which is above a bottom end cover (namely, an end cover 9) of the right collecting pipe 2 and above a lowest clapboard (namely, a clapboard 13) of the right collecting pipe 2.

The molecular sieve column 14 is a porous cylinder or a porous square column (in this embodiment, a porous cylinder) sintered or pressed from a molecular sieve having a high water absorbing capacity. The molecular sieve column 14 is located at the lower part of the right collecting pipe 2, and is located in a pipe section (i.e., pipe section 2b) above a bottom end cover (i.e., end cover 9) of the right collecting pipe 2 and below the lowest partition plate (i.e., partition plate 13) of the right collecting pipe 2.

In this embodiment, the partitions 12 and 13 divide all the microchannel flat tubes into three tube passes: the micro-channel flat tube above the partition plate 12 is a first tube pass, the micro-channel flat tube between the partition plate 12 and the partition plate 13 is a second tube pass, and the micro-channel flat tube below the partition plate 13 is a third tube pass. The refrigerant flows through all the microchannel flat tubes 2 times.

Referring to fig. 2, when the microchannel heat exchanger 100 is used as a condenser, the flow paths of the refrigerant are: the inlet pipe 10 → the pipe section 1a of the left header 1 → the flat microchannel tubes of the first tube pass → the pipe section 2a of the right header 2 → the flat microchannel tubes of the second tube pass → the pipe section 1b of the left header 1 → the flat microchannel tubes of the third tube pass → the pipe section 2b of the right header 2 → the molecular sieve column 14 → the outlet pipe 11. The refrigerant is high-temperature and high-pressure gas delivered by the compressor before entering the inlet pipe 10, when the refrigerant flows through the microchannel flat tubes 3 of the microchannel heat exchanger 100, heat is transferred to air flowing through the fins 4, the refrigerant giving off heat to the air is condensed and changed into high-temperature and high-pressure liquid, and when the refrigerant flows through the last tube pass, the refrigerant is completely changed into liquid. When the liquid refrigerant flows through the molecular sieve column 14, impurities in the liquid refrigerant are intercepted by the molecular sieve column 14, moisture in the liquid refrigerant is adsorbed by the molecular sieve column 14, and finally, the refrigerant flowing out of the outlet pipe 11 is the filtered and dried refrigerant.

In the above embodiment, the inlet pipe 10 and the outlet pipe 11 are disposed on the collecting pipes on different sides, but the technical solution of the present invention is not limited to whether the inlet pipe 10 and the outlet pipe 11 are disposed on different sides or disposed on the same side. When the number of the baffles is odd, the inlet pipe 10 and the outlet pipe 11 may be disposed on the same side of the header, as long as the molecular sieve column 14 is disposed in the lowest section of the header and is the last section in the flow direction of the refrigerant. In another embodiment, shown in fig. 4, a baffle 12 divides the left header 1 into two sections 1a and 1b, and there is no baffle in the right header 2. At this time, the outlet pipe 11 is arranged at the lower part of the left collecting pipe 1, and the outlet pipe 11 is located above the bottom end cover 7 of the left collecting pipe 1 and below the lowest partition plate (i.e. partition plate 12) of the left collecting pipe 1. Correspondingly, the molecular sieve column 14 is located at the lower part of the left collecting pipe 1, and is located in the pipe section above the bottom end cover 7 of the left collecting pipe 1 and below the lowest partition plate (i.e. partition plate 12) of the left collecting pipe 1.

It can be seen from the above embodiments that, since the drying and filtering device is integrated on the header of the microchannel heat exchanger, the originally unavailable cavity in the header is fully utilized, and a special drying device, a special filtering device or a drying and filtering two-in-one device is not required to be arranged outside the heat exchanger, so that the volume and weight occupied by the device are reduced, and the construction of a smaller and lighter micro refrigeration system is possible. In addition, because the drying and the filter are omitted, and the corresponding connecting pipelines are also omitted, the number of point positions needing to be welded in the pipelines is reduced, the potential leakage risk is reduced, and the reliability of the refrigerating system is improved.

Reference to "communicating" in the above context is to a location in the material having cavities that are connected together to allow fluid to flow therethrough.

In this document, the terms left, right, above, below, inner, outer, middle, top, bottom, end and the like are used for the sake of clarity and convenience only for the description of the embodiments. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, any modification, equivalent replacement, or improvement made within the principle and principle of the present invention should be included within the protection scope of the present invention.

Claims (3)

1. A micro-channel heat exchanger is used for heat exchange between air and refrigerant, and is characterized in that: the microchannel heat exchanger comprises a left collecting pipe, a right collecting pipe, a plurality of microchannel flat pipes arranged in parallel, fins, side plates, end covers, an inlet pipe, an outlet pipe, a partition plate, a molecular sieve column and the like; the left collecting pipe, the right collecting pipe, the micro-channel flat pipes, the fins, the side plates, the end covers, the inlet pipes, the outlet pipes, the partition plates and the like are integrally brazed, and the molecular sieve column is installed in the right collecting pipe and is positioned at the lower part of the right collecting pipe; the refrigerant flows into the microchannel heat exchanger through the inlet pipe and exchanges heat with air flowing through the fins, and the refrigerant after heat exchange needs to flow through the molecular sieve column before flowing out of the microchannel heat exchanger through the outlet pipe, so that the filtration of impurities in the refrigerant and the drying of the refrigerant are realized while the heat exchange is realized.

2. The microchannel heat exchanger of claim 1, wherein: the left collecting pipe and the right collecting pipe are round pipes or square pipes with equal length and are respectively positioned at two sides of the micro-channel heat exchanger; the micro-channel flat tubes arranged in parallel have the same length, the same cross-sectional shape and the same spacing, and the two ends of the micro-channel flat tubes are respectively inserted into the left collecting pipe and the right collecting pipe and are vertical to the axes of the left collecting pipe and the right collecting pipe; the side plates are divided into two blocks, wherein one block is positioned above the uppermost micro-channel flat tube and is flush with the upper ends of the left collecting pipe and the right collecting pipe, and the other block is positioned below the lowermost micro-channel flat tube and is flush with the lower ends of the left collecting pipe and the right collecting pipe; the fins are corrugated fins and are positioned among the plurality of parallel micro-channel flat tubes and between the micro-channel flat tubes and the side plates; the number of the end covers is 4, and the 4 end covers are respectively positioned at the top of the left collecting pipe, the bottom of the left collecting pipe, the top of the right collecting pipe and the bottom of the right collecting pipe; the number of the partition plates is more than or equal to 1, and the partition plates are respectively inserted into the left collecting pipe and the right collecting pipe so as to divide the interiors of the left collecting pipe and the right collecting pipe into a plurality of pipe sections; the inlet pipe is arranged at the upper part of the left collecting pipe, and the inlet pipe is positioned below the top end cover of the left collecting pipe and above the uppermost partition plate of the left collecting pipe; the outlet pipe is arranged at the lower part of the right collecting pipe and is positioned above the bottom end cover of the right collecting pipe and below the lowest clapboard of the right collecting pipe; the molecular sieve column is a porous cylinder or a porous square column which is formed by sintering or pressing a molecular sieve with strong water absorption capacity, and is positioned in the right collecting pipe and in a pipe section which is above the bottom end cover of the right collecting pipe and below the lowest clapboard of the right collecting pipe.

3. The microchannel heat exchanger of claim 1 and claim 2, wherein: optionally, when the number of the partition plates is odd, the outlet pipe is arranged at the lower part of the left collecting pipe, and the outlet pipe is positioned above the bottom end cover of the left collecting pipe and below the lowest partition plate of the left collecting pipe; correspondingly, the molecular sieve column is positioned in the left collecting pipe and is positioned in a pipe section which is above the bottom end cover of the left collecting pipe and below the lowest clapboard of the left collecting pipe.

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