WO2012058791A1

WO2012058791A1 - Micro-channel heat exchanger and device using it

Info

Publication number: WO2012058791A1
Application number: PCT/CN2010/001808
Authority: WO
Inventors: 张杰山
Original assignee: 金龙精密铜管集团股份有限公司; 上海金龙制冷技术有限公司
Priority date: 2010-11-02
Filing date: 2010-11-11
Publication date: 2012-05-10
Also published as: CN101995172B; CN101995172A

Abstract

Disclosed are a micro-channel heat exchanger and a device using it, wherein, the micro-channel heat exchanger includes multiple flat tubes (1) disposed in parallel with each other and perpendicular to the ventilation direction, and hollow manifolds (3) disposed at two ends of the flat tubes (1). A heat exchanging medium passage is disposed inside the flat tubes (1), and ends of each flat tube (1) are inserted into the hollow manifolds (3). The heat exchanging medium passage in the flat tubes (1) is communicated with a hollow passage in the hollow manifolds (3), and a water guide plate (7) or a water guide sheet is disposed between two adjacent flat tubes (1). A condensed water flow passage is disposed on the water guide plate (7) or water guide sheet, and corrugated fins (8) are disposed between the water guide plate (7) or water guide sheet and the adjacent flat tube (1). The micro-channel heat exchanger can significantly improve the effect of discharging water.

Description

Microchannel heat exchanger and apparatus using the same

The present application claims the priority of the Chinese Patent Application No. 201010528364. for reference.

Technical field

The invention relates to the technical field of heat exchangers, and in particular to a microchannel heat exchanger. The invention also relates to an apparatus for applying the microchannel heat exchanger, such as an air-cooled air conditioner or a heat pump. Background technique

In an air-cooled air conditioning system, when a heat exchanger is used in an evaporator, water vapor in the air will condense on the surface of the heat exchanger, and the condensation of water to a certain extent will reduce the heat transfer performance of the heat exchanger and increase the wind resistance. It may also cause "drip" in the air conditioner. When the heat exchanger is used in the outdoor unit of the heat pump, the surface of the outdoor heat exchanger will also condense or frost under heating conditions. When frosting reaches a certain level, the air conditioner needs to start the defrost mode to melt the frost of the outdoor heat exchanger, and the melted water needs to be removed in time, otherwise it will re-condense and increase the degree of frosting. It can be seen that both the evaporator of the air-cooled air conditioning system and the outdoor unit of the heat pump type air conditioner need to have good drainage performance.

When the typical microchannel heat exchanger is used in the heat exchanger of the air conditioning system, if the heat exchanger is involved in drainage, the flat tube of the heat exchanger needs to be placed vertically, and the condensed water needs to be downward from the gap of the window fin. The way of flow is to drain. 1 is a schematic view showing the structure of a typical microchannel heat exchanger; FIG. 2 is a partial schematic view of FIG. 1 for explaining the drainage mode. Referring to FIG. 1 and FIG. 2, the microchannel heat exchanger is mainly composed of the following components and manners as follows: A plurality of rows of parallel flat tubes 1 are arranged in a direction perpendicular to the ventilation direction, and a flat exchange tube 1 is provided with a heat exchange medium (also referred to as The passage through which the refrigerant flows, the corrugated window fins 2 are welded between the adjacent flat tubes 1. The two ends of the flat tube 1 are inserted into the hollow header 3, and the inlet tube 4 and the outlet tube 5 are respectively connected to the two headers 3, and the side tube 6 is disposed outside the outermost flat tube 1. To protect the heat exchanger. When the heat exchanger is placed, the flat tube 1 is kept vertical, and when draining, the condensed water flows vertically downward from the gap of the corrugated window fin 2 to achieve the purpose of drainage. However, in the heat exchangers shown in Figures 1 and 2 above, since the drainage needs to follow the window opening gap, the condensed water on the upper fins needs to flow through the fenestration of each fin in the lower portion, so that the drainage is very difficult. Moreover, most of the surface of the fin is covered with thick condensed water, which also reduces heat exchange performance and increases air resistance. Due to poor drainage, microchannel heat exchangers are less used for outdoor heat transfer in evaporators or heat pumps. This limits the range of applications for microchannel heat exchangers. Drainage of microchannel heat exchangers is an urgent problem to be solved.

In U.S. Patent No. 6,439,300, B1, a microchannel heat exchanger is disclosed which is also composed of parallel flat tubes and fins, the adjacent flat tubes are spaced c apart, and the fins have a small root inner radius. r, the length of the fin open window is 1; it satisfies the following relationship, 0 <= r / c < 0.057, 0.89 <= l / c < = 1.01 and 0.29 <= p / c < = 0.43. However, this form of fin still needs to drain from the window slit of the corrugated fin, and is still limited by the structure of the corrugated fin, and the drainage effect is not substantially improved.

In the Chinese patent publication No. CN1504699A, a microchannel heat exchanger is disclosed in which the corrugated groove lines and ridge lines of the corrugated fins are inclined in the inward direction of the heat exchanger, the fins and the horizontal direction. Improve the drainage of the heat exchanger at a certain angle. However, this form of fin processing is very difficult and difficult to use in bulk for heat exchangers. Summary of the invention

The invention provides a microchannel heat exchanger to solve the problem of poor discharge of condensed water in the existing microchannel heat exchanger. The present invention further provides an apparatus for applying the microchannel heat exchanger, such as an air-cooled air conditioner or a heat pump. The invention provides a microchannel heat exchanger comprising a plurality of flat tubes arranged in parallel perpendicular to a ventilation direction and hollow collecting tubes disposed at two ends of the flat tubes; the flat tubes are internally provided with a heat exchange medium The end of each flat tube is inserted into the hollow collecting tube, and the heat exchange medium passage of the flat tube is in communication with the hollow passage of the hollow collecting tube; wherein, between the adjacent two flat tubes, a water guiding plate or a water guiding plate, wherein a condensed water flow passage is disposed on the water guiding plate or the water guiding plate; and a corrugated fin is disposed between the water guiding plate or the water guiding sheet and the adjacent flat tube.

Optionally, the water deflector or the water guide sheet is disposed parallel to the flat tube.

Optionally, an angle between the corrugated fin and the water deflector or the water guide is an acute angle. Optionally, the width of the water deflector or the water guide sheet in the ventilation direction is less than, greater than or equal to the width of the flat tube.

Optionally, a sharp corner protrusion is disposed on an outer surface of the water deflector or the water guide sheet.

Optionally, a plurality of water guiding plates or water guiding sheets are arranged along the ventilation direction between the adjacent flat tubes, and a gap is disposed between the adjacent water guiding sheets or the water guiding plates as the condensed water flow channel. . Optionally, the water deflector or the water guide sheet is one or more combined structures.

Optionally, the water guiding plate or the water guiding plate has a triangular corrugated shape, a curved corrugated shape or a trapezoidal corrugated shape in a cross section in the ventilation direction, and the corrugated groove serves as a condensed water flow passage. Optionally, when a water guiding plate is disposed between two adjacent flat tubes, the water guiding plate is a hollow plate, and a drainage hole is opened on a surface of the hollow plate that is in contact with the corrugated fin.

Optionally, the drain hole has a circular shape, an elliptical shape, a square shape, or a rectangular shape with a long side in a vertical direction.

Optionally, the corrugated fin is provided with a ventilation window, and the fin is called a window fin. Further, the present invention provides an apparatus comprising the microchannel heat exchanger of any of the above.

Optionally, the device is an air-cooled air conditioner or a heat pump type air conditioner.

Compared with the prior art, one aspect of the present invention has the following advantages: a water guide sheet or a water deflector is disposed between two adjacent flat tubes of the microchannel heat exchanger, and the water guide sheet or the water deflector and the fin Connected; during operation, the condensed condensate collects by gravity to the position of the water guide or the water deflector, from the water guide (or water deflector) or the water guide (or water deflector) The gap between the fins and the fins is slid down for drainage; compared with the existing heat exchanger, the drainage effect can be significantly improved; in addition, the water guide sheet (or the water deflector) simultaneously increases the heat exchange area. The utility model can enhance the heat exchange effect of the heat exchanger; moreover, the components of the microchannel heat exchanger of the invention are simple in structure and easy to process; the overall structure of the heat exchanger is simple and easy to mass-produce.

DRAWINGS

1 is a schematic structural view of a conventional microchannel heat exchanger;

Figure 2 is a partial schematic view of Figure 1 for explaining the drainage mode;

3 is a schematic structural view of an embodiment of a microchannel heat exchanger according to the present invention; and FIG. 4 is a partial schematic view of FIG. 3 for explaining a drainage mode thereof;

Figure 5 is a partial schematic view of a microchannel heat exchanger having a corrugated water guiding plate or a water guiding plate; Fig. 6 is a schematic sectional view of a triangular corrugated water guiding plate or a water guiding plate; Fig. 7 is a curved corrugated water guiding plate or guide A schematic cross-sectional view of a water board; Figure 8 is a schematic cross-sectional view of a trapezoidal corrugated water guide or a water deflector; Figure 9 is a partial structural view of a microchannel heat exchanger of a combined water deflector or water deflector; Figure 10 is a hollow water deflector Schematic diagram of the local structure of the microchannel heat exchanger. detailed description

Numerous specific details are set forth in the description below in order to provide a thorough understanding of the invention. However, the present invention can be implemented in many other ways than those described herein, and a person skilled in the art can make a similar promotion without departing from the spirit of the invention, and thus the invention is not limited by the specific embodiments disclosed below.

The microchannel heat exchanger of the present invention will now be described with reference to the accompanying drawings.

3 is a schematic structural view of an embodiment of a microchannel heat exchanger of the present invention, and FIG. 4 is a partial schematic view of FIG. 3 for explaining a drainage mode thereof.

Referring to FIG. 3, in an embodiment of the present invention, the microchannel heat exchanger includes a flat tube 1, a corrugated fin 8, a water guide or a water guide 7, a hollow header 3, an inlet pipe 4, an outlet pipe 5, and Side panel 6.

Wherein, the flat tubes 1 are plural. A hollow passage is provided in each of the flat tubes 1. This channel is used to flow a heat exchange medium, such as a refrigerant (also known as a refrigerant), called a heat exchange medium channel. The plurality of flat tubes 1 are arranged in parallel along the direction perpendicular to the ventilation direction, and a certain distance is provided between the adjacent flat tubes for setting the water guide sheets or the water guiding plates 7 and the corrugated fins 8 and ventilating them. In order to allow heat exchange with the outside air when the heat exchange shield flows through the flat tube 1.

In the state of use, the flat tubes 1 are generally arranged vertically. All flat tubes 1 have the same or substantially the same height and width.

The hollow headers 3 are two and are disposed at both ends of the flat tube 1. The hollow header 3 is internally provided with a hollow passage for distributing the heat exchange medium to the flat tube 1, and collecting the heat exchange shield flowing through the flat tube 1. According to the flow direction of the heat exchange medium, the hollow headers 3 at both ends function as the above-mentioned distribution or collection, respectively. The end of each flat tube 1 is inserted into the hollow header 3 such that the heat exchange medium passage in the flat tube 1 communicates with the hollow passage of the hollow header 3.

The corrugated fins 8 are used to increase the heat exchange area on the air side and improve the heat exchange performance of the heat exchanger. In particular, in an embodiment of the invention, it also has the effect of accelerating drainage. The corrugated fins 8 may be of any existing structure, and a structure for facilitating the flow of condensed water may be provided on the corrugated fins 8, for example. Set the ventilation window. This is not repeated here.

The water guiding sheet or the water guiding plate 7 is disposed between the adjacent two flat tubes 1, and the water guiding sheet or the water guiding plate 7 is disposed between all the two adjacent flat tubes 1. The water deflector or water guide sheet 7 may be disposed parallel to the flat tube. The width of the water deflector or water guide sheet 7 in the ventilation direction may be less than or equal to the width of the flat tube.

Corrugated fins 8 are disposed between each of the water guide sheets or the water deflector 7 and the adjacent flat tubes. Here, the corrugated fins 8 may be fixed to the flat tube 1 and the water guide sheet or the water deflector 7 by welding. Thereby, the corrugated fin 8, the water guide sheet or the water deflector 7 and the flat tube 1 are referred to as a unitary body. A condensate flow passage is provided on the water guide or the water deflector 7, and its main function is to guide the condensed water.

Further, in the embodiment of the microchannel heat exchanger of the present invention, an inlet pipe 4 and an outlet pipe 5 are further provided on the hollow header. In operation, the heat exchange medium is introduced into the hollow header 3 through the inlet pipe 4, after passing through the flat pipe 1, and collected through the hollow header 3 at the other end, and the heat exchanger is taken out by the outlet pipe 5. Further, in order to avoid damage, a side plate 6 is provided on the outer side of the flat tube 1 provided at the edge for protecting the heat exchanger.

Figure 4 is a partial enlarged view of the embodiment of the microchannel heat exchanger shown in Figure 3. Referring to FIG. 4, during the operation, the condensed water will condense on the surface of the flat tube 1 and the corrugated fin 8, and the condensed water will slide down along the corrugated fin 8 due to gravity, and finally collect on the water guide sheet or The water deflector 7 flows downward along the condensate flow passage on the water guide or the water deflector 7, and is finally discharged outside the heat exchanger.

Since each corrugated fin 8 is in contact with the water guiding plate or the water guiding plate 7, the condensed water flows downward along the condensed water flow passage of the water guiding plate or the water guiding plate 7, due to the viscous force. The condensed water of the root portion of each of the corrugated fins 8 connected to the water guiding sheet or the water deflecting plate 7 can be "sticked" away, thereby achieving the effect of accelerating drainage. In addition, in order to ensure that the condensed water can flow along the surface of the corrugated fin 8 to guide the water piece or the water guiding plate 7, the angle between the corrugated fin 8 and the water guiding piece or the water guiding plate 7 is set to an upward acute angle, To increase the effect of drainage, you can adjust the angle of the acute angle to make it as small as possible. In addition, in order to further increase the drainage effect, a plurality of protrusions having sharp corners may be disposed on the outer surface of the water guide sheet or the water deflector 7, so that the condensed water can pierce the condensed water during the flow process. The liquid film reduces the adhesion to the surface of the water guide or the water deflector 7. The water guide sheet or water deflector 7 in the above embodiment may have various forms, which are specifically described below. Figure 5 is a partial schematic view of a microchannel heat exchanger having a corrugated water deflector or water deflector.

Referring to FIG. 5, the water guiding piece 7-2 has a corrugated shape in a cross section in the ventilation direction, and a vertical downward groove and a protrusion in a vertical direction are called a corrugated water guiding plate or a water guiding plate 7-2. . The groove serves as a condensate flow passage, and the protrusion may be provided in a sharp-edged shape for piercing the liquid film to improve the drainage capacity. Figure 6, Figure 7, and Figure 8 are schematic cross-sectional views of a triangular corrugated water guide or water deflector, a curved corrugated water guide or a water deflector, and a trapezoidal corrugated water guide or water deflector, respectively. Wherein, for the trapezoidal corrugated water deflector or the water guide sheet, including the flat section (ie, the trapezoidal bottom) and the inclined section (ie, the trapezoidal waist), the flat section and the corrugated fin 8 (see FIG. 3) can be welded during welding. In this case, it is advantageous to increase the contact area between the water guide sheet or the water deflector and the corrugated fin 8, which not only helps to improve the overall strength and rigidity of the microchannel heat exchanger, but also reduces the water guide sheet or the water deflector. The thermal resistance between the corrugated fins 8 and the corrugated fins 8 is advantageous for enhancing the heat exchange effect. Among them, in the trapezoidal corrugated water guide or the water deflector, the trapezoidal contour passage is a condensed water flow passage.

Another water deflector or water deflector is shown in FIG. Referring to FIG. 9, the water deflector or the water guide 7-1 is provided with two (or more than two) in the ventilation direction, and a gap is provided between the adjacent water deflector or the water guide 7-1. This gap serves as a condensate flow passage. Moreover, each of the water deflectors or water guide sheets 7-1 is a multi-piece composite structure.

Figure 10 is a schematic view showing the structure of a microchannel heat exchanger having a hollow water deflector. Referring to FIG. 10, the water deflector 7-3 is a hollow plate, and a drain hole 7-4 is formed on a surface of the hollow plate 7-3 that is in contact with the corrugated fin 8, and the drain hole 7-4 is connected to the drain hole 7-4. The hollow passage of the hollow tube 7-3 is such that the condensed water on the corrugated fin 8 can flow into the internal passage of the hollow tube 7-3 from the drain hole 7-4 and is discharged along the internal passage, The hollow passage of the empty pipe 7-3 serves as a condensate flow passage. Wherein, the shape of the drainage hole is a circle, an ellipse, a square or a rectangle with a long side in a vertical direction. The case shown in Fig. 10 is a rectangle.

The water deflector or water deflector 7 can also have other structures, which are not described again here, and those skilled in the art can derive corresponding modified structures according to the teachings of the specification of the present invention. However, any structure disposed between two adjacent flat tubes 1, connecting all corrugated fins between adjacent flat tubes, and having a drainage function should be included in the scope of the present invention. The microchannel heat exchanger of the present invention can be applied to an air conditioning apparatus such as an air-cooled air conditioner or a heat pump type air conditioner. The air conditioning apparatus applied to the microchannel heat exchanger of the present invention has a good drainage effect. The present invention has been disclosed in the above preferred embodiments, but it is not intended to limit the invention, and the present invention may be made without departing from the spirit and scope of the invention. The scope of protection should be determined by the scope defined by the claims of the present invention.

Claims

What is claimed is: 1. A microchannel heat exchanger, comprising: a plurality of flat tubes disposed in parallel along a direction perpendicular to a ventilation direction; and a hollow header disposed at both ends of the flat tubes; the inside of the flat tubes is provided with heat exchange a medium passage, the end of each flat tube is inserted into the hollow collecting tube, and the heat exchange medium passage of the flat tube is connected with the hollow passage of the hollow collecting tube; wherein, between the adjacent two flat tubes, There is a water guiding plate or a water guiding plate, and a condensed water flow passage is disposed on the water guiding plate or the water guiding plate; a corrugated fin is disposed between the water guiding plate or the water guiding sheet and the adjacent flat tube.

2. The microchannel heat exchanger according to claim 1, wherein the water deflector or the water guide sheet is disposed parallel to the flat tube.

3. The microchannel heat exchanger according to claim 1, wherein an angle between the corrugated fin and the water deflector or the water guide is an acute angle.

4. The microchannel heat exchanger according to claim 1, wherein a width of the water deflector or the water guide sheet in a ventilation direction is less than or equal to a width of the flat tube.

The microchannel heat exchanger according to claim 1, wherein a sharp corner protrusion is provided on an outer surface of the water deflector or the water guide sheet.

The microchannel heat exchanger according to any one of claims 1 to 5, wherein a plurality of water guiding plates or water guiding sheets between adjacent flat tubes are arranged along the ventilation direction, and adjacent to each other. A gap is provided between the water guiding sheet or the water guiding plate as the condensed water flow passage.

The microchannel heat exchanger according to any one of claims 1 to 5, wherein the water guiding plate or the water guiding sheet is one or more combined structures.

The channel heat exchanger according to any one of claims 1 to 5, wherein the water guiding plate or the water guiding plate has a triangular corrugated shape, a curved corrugated shape or a trapezoidal corrugated shape in a cross section in the ventilation direction. The corrugated groove serves as a condensate water flow passage.

The microchannel heat exchanger according to any one of claims 1 to 5, wherein when a water deflector is disposed between two adjacent flat tubes, the water deflector is a hollow plate, A drain hole is formed in a surface of the hollow plate that is in contact with the corrugated fin.

10. The microchannel heat exchanger according to claim 9, wherein the drain hole has a circular shape, an elliptical shape, a square shape or a rectangular shape with a long side in a vertical direction.

The microchannel heat exchanger according to any one of claims 1 to 5, wherein the corrugation A ventilating window is provided on the fin, and the fin is called a window fennel.

12. An apparatus comprising the microchannel heat exchanger of any of claims 1 to 11.

13. Apparatus according to claim 12, characterized in that the apparatus is an air-cooled air conditioner or a heat pump type air conditioner.