CN204177261U - A kind of flat pipes of heat exchanger and micro-channel heat exchanger - Google Patents

Abstract

The utility model discloses a kind of flat pipes of heat exchanger, in flat strip, its inside is provided with the microchannel at multiple connection two ends, described flat tube (2) comprises at least two sections of straight-tube portions, and in the dogleg section (2-3) described in adjacent two between straight-tube portion, described dogleg section (2-3) has the bending angle that at least two flexion torsions are formed; Each described straight-tube portion is positioned at same plane, and extends on the length direction of flat tube (2).This flat tube can make heat exchanger realize layering draining, and the draining stroke of every one deck is relatively short, and drainage efficiency is high, can effectively avoid occurring seeping phenomenon, thus significantly improve the heat exchange property of heat exchanger.The invention also discloses the micro-channel heat exchanger being provided with described flat tube.

Description

A heat exchanger flat tube and microchannel heat exchanger

technical field

The utility model relates to the technical field of refrigeration equipment, in particular to a flat tube used as a microchannel heat exchanger of an evaporator in a refrigeration system. The utility model also relates to a microchannel heat exchanger provided with the flat tube.

Background technique

The heat exchanger is the main heat transfer component of the refrigeration system, and the quality of the heat exchanger directly affects the overall performance of the system.

The flat tube of the micro-channel heat exchanger has a plurality of fine flow channels, and the two ends of the flat tube are connected with the header, and the separator is arranged in the header to separate the flow channel of the heat exchanger into several processes. Due to the advantages of high heat transfer coefficient, high surface area-to-volume ratio, low heat transfer temperature difference, and low flow resistance, it is gradually being used in commercial and domestic refrigeration and air-conditioning industries.

At present, when the microchannel heat exchanger is used as an evaporator, the condensed water is drained through the fin openings. In the existing structure, the condensed water flows out of the heat exchanger along the fins and flat tubes.

Since the condensed water of the heat exchanger flows out in the same direction from top to bottom, the process is relatively long, and it is easy to generate accumulated water in the lower part of the heat exchanger, and the accumulated water is easy to cause frost and seriously affect the heat transfer performance of the heat exchanger .

Therefore, how to find another way and design a new type of heat exchanger to overcome the above-mentioned defects is a technical problem to be solved by those skilled in the art.

Utility model content

The first purpose of the utility model is to provide a heat exchanger flat tube. The flat tube can achieve layered drainage, the drainage stroke of each layer is relatively short, the drainage efficiency is high, and water accumulation can be effectively avoided, thereby significantly improving the heat transfer performance of the heat exchanger.

The second purpose of the utility model is to provide a microchannel heat exchanger provided with the flat tube.

In order to achieve the above-mentioned first purpose, the utility model provides a flat tube of a heat exchanger, which is flat and long, and is provided with a plurality of micro-channels connecting both ends. The flat tube includes at least two sections of straight tubes, and a bent portion located between two adjacent straight pipe portions, the bent portion has at least two bending angles formed by bending and twisting.

Preferably, each of the straight tube parts is located in the same plane and extends in the length direction of the flat tube.

Preferably, the straight tube portions are aligned or misaligned with each other in the length direction of the flat tube.

Preferably, the bending portion has two bending angles, and the straight pipe portions at both ends thereof form a “Z” shape as a whole.

Preferably, the bending portion has four bending angles, forming a “U”-shaped bending portion between straight pipe portions at two ends thereof.

Preferably, the bending angle ranges from greater than or equal to 0° to less than 180°.

In order to achieve the above-mentioned second purpose, the utility model provides a microchannel heat exchanger, including headers, flat tubes and fins, the headers are arranged at both ends of the flat tubes, and the flat tubes are arranged in parallel Between the headers, the fins are arranged between the adjacent flat tubes, and the flat tubes are the heat exchanger flat tubes described in any one of the above.

Preferably, the bent portion is provided with drainage components and/or fins.

Preferably, the drainage component is a water guide plate or a water guide sheet.

Preferably, the water guide plate is an integral flat plate, which is sequentially divided into a horizontal section, an inclined section and a sink section along the drainage direction; the horizontal section is connected to the drainage part of the bent part.

The heat exchanger flat tube provided by the utility model is different from the traditional flat tube. It divides the tube body into a plurality of straight tube parts through the bending part, that is, the flat tube is divided into several sections in turn by bending, and the flat tube is assembled into a replacement tube. After the heater, each section can form an independent drainage channel, and the condensed water discharged from the previous section will not enter the next section, so that the amount of water to be discharged from each section is reduced, and the drainage stroke is shortened. This method of layered drainage is greatly improved. The drainage effect is improved, and the micro-channel heat exchanger with good drainage effect will significantly slow down the frosting speed under outdoor low temperature and high humidity conditions, and can retain sufficient effective heat exchange area, thereby improving heat exchange efficiency and greatly reducing energy consumption , At the same time, when defrosting, the condensed water can be discharged from the surface of the heat exchanger as soon as possible, reducing the impact on the next cycle.

The microchannel heat exchanger provided by the utility model is provided with the flat tube of the heat exchanger. Since the flat tube has the above-mentioned technical effect, the microchannel heat exchanger provided with the flat tube should also have the corresponding technical effect.

Description of drawings

Fig. 1 is the first kind of specific structural schematic diagram of the heat exchanger flat tube provided by the utility model;

Fig. 2 is the second specific structural schematic diagram of the heat exchanger flat tube provided by the utility model;

Fig. 3 is the third specific structural schematic diagram of the heat exchanger flat tube provided by the utility model;

Fig. 4 is a structural schematic diagram of a heat exchanger flat tube with a bending angle of less than 90°;

Fig. 5 is a structural schematic diagram of a heat exchanger flat tube with a bending angle greater than 90°;

Fig. 6 is a structural schematic diagram showing an included angle between the straight tube parts of the heat exchanger flat tubes in the length direction;

Fig. 7 is a kind of specific structural schematic diagram of the microchannel heat exchanger provided by the utility model;

Fig. 8 is the front view of water guide plate installed on the microchannel heat exchanger shown in Fig. 7;

Fig. 9 is a side view of Fig. 8;

FIG. 10 is a top view of FIG. 8 .

In the picture:

1. Header 2. Flat pipe 2-1. First straight pipe part 2-2. Second straight pipe part 2-3. Bending part 3. Fin 4. Water guide plate 4-1. Horizontal section 4- 2. Inclined section 4-3. Sink section

Detailed ways

In order to enable those skilled in the art to better understand the solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to FIG. 1 , which is a schematic diagram of the first specific structure of the flat tube of the heat exchanger provided by the present invention.

In a specific embodiment, the heat exchanger flat tube 2 provided by the utility model is in the shape of a flat strip, and a plurality of microchannels (not shown) connected to both ends are arranged inside it as a heat exchange medium (such as refrigerant), the single flat tube is divided into a first straight tube part 2-1, a second straight tube part 2-2 and a bent part 2-3 between the straight tube parts.

Due to the limitation of the special structure, the flat tube 2 cannot be bent in any direction like a round tube. For this, the utility model adopts a bending and twisting method to bend it, so that while realizing the bending and steering, It can ensure the unimpeded flow of the microchannel inside the flat tube 2 and the body of the flat tube 2 from being damaged.

As shown in the figure, the bending part has two bending angles of 90° in total, and the straight pipe parts at both ends form a "Z" shape as a whole. In this way, the first straight tube part 2-1 and the second straight tube part 2-2 of the flat tube 2 are still located in the same plane, but they are laterally staggered by a certain distance in the length direction, that is, the flat tube 2 is no longer a simple straight tube. tubes, but straight tubes with bends. Because it is bending and twisting, when viewed from the thickness direction of the flat tube 2, the bending part 2-3 is generally parallelogram, and the orientation does not change after bending, the front is still the front, the back is still the back, left and right Not upside down either.

Of course, the flat tube 2 can also be bent in the same manner into a shape that is a mirror image of that shown in FIG. 1 .

When the flat tube 2 is applied to a heat exchanger, each straight tube part forms an independent drainage channel, which respectively undertakes the drainage of each part. For the entire heat exchanger, the water flow channel changes from one to two, and each water flow The drainage capacity of the channel is greatly reduced, and the two parts are drained at the same time, the drainage efficiency is greatly improved, and the water storage capacity of the heat exchanger is greatly reduced.

Please refer to FIG. 2 , which is a second specific structural diagram of the flat tube of the heat exchanger provided by the present invention.

In the second specific embodiment, the bending part 2-3 has four bending angles, and a "U"-shaped bending part is formed between the straight pipe parts at both ends, and the first bending angle and the fourth bending angle The bending angle, the second bending angle and the third bending angle are mirror symmetrical about the central line of the bending portion. In this way, the first straight pipe part 2-1 and the second straight pipe part 2-2 of the flat pipe are still located in the same plane, and are aligned up and down in the length direction. The side convex part formed by continuous bending, because the two straight tube parts of the whole flat tube 2 have no lateral misalignment, only the bending part protrudes laterally, so it helps to reduce the occupied space, so that more reasonable layout, and this bending and twisting method can make the first and second bending angles completely coincide with the third and fourth bending angles in the longitudinal projection, reducing the size of the flat tube 2 in the thickness direction as much as possible ( If the bending torsion direction of the third bending angle and the fourth bending angle of the flat tube 2 is the same as that of the first bending angle and the second bending angle, the thickness of the bending portion 2-3 will inevitably be doubled).

Of course, the flat tube 2 can also be bent in the same manner into a shape that is a mirror image of that shown in FIG. 2 .

When the flat tube 2 is applied to a heat exchanger, by adding a drainage component between the first straight tube part 2-1 and the second straight tube part 2-2, each straight tube part can form an independent drainage channel respectively, respectively Bear the drainage of each part. For the whole heat exchanger, the water flow channel changes from one to two, and the drainage capacity of each water flow channel is greatly reduced, and the two parts are drained at the same time, the drainage efficiency is greatly improved, and the water storage capacity of the heat exchanger significantly reduce.

The first straight pipe part 2-1 and the second straight pipe part 2-2 of the flat pipe shown in Fig. 1 and Fig. 2 all extend in the length direction of the flat pipe, that is, the straight pipe part is always distributed along the length direction of the flat pipe, If the projection is carried out along the direction perpendicular to the flat tube, there may be situations such as end-to-end butt joint, head-to-tail overlap (see Figure 4) or a certain distance between the head and tail (see Figure 5) between the straight pipe parts, but in any case, the overall The trend always points in one direction, and the shape of flat tubes is still elongated, and they will not completely overlap or be distributed side by side.

In addition, if the bent part of the flat tube shown in FIG. 2 is longer in the middle, it can also be regarded as including three straight tube parts, and the bending form shown in FIG. 1 is adopted between each straight tube part.

The above embodiments are only preferred solutions, and are not specifically limited thereto. On this basis, targeted adjustments can be made according to actual needs, so as to obtain different implementation modes. For example, the flat tube 2 has three straight tube parts (see Fig. 3) or more, in this case, each straight tube part can be all laterally staggered, also can be all aligned along the length direction, and can also be partly laterally staggered, Partial alignment; or, as shown in Figure 4 and Figure 5, in addition to 90 °, the bending angle range of the bending part 2-3 is greater than or equal to 0 ° to less than 180 °; or, as shown in Figure 6 As shown, there is an angle between the straight pipe parts in the length direction, but the overall trend is still in the length direction, and so on. Since there are many ways of possible realization, it is not necessary to give examples one by one here.

Please refer to FIG. 7, which is a specific structural schematic diagram of the micro-channel heat exchanger provided by the present invention.

In addition to the flat tubes of the heat exchanger, the utility model also provides a microchannel heat exchanger, which is mainly composed of headers 1, flat tubes 2 and fins 3, wherein the number of headers 1 is two, and they are respectively arranged in vertical The two ends of the straightly arranged flat tubes 2 play the role of distributing and collecting the heat exchange medium. The ends of each flat tube 2 are inserted into the header 1 , and its microchannels communicate with the channels of the header 1 .

Specifically, the flat tube 2 adopts the flat tube in the above-mentioned first specific method, and a plurality of flat tubes 2 are vertically and parallelly arranged, and the size parameters of each flat tube 2 are the same, and a certain distance is kept between adjacent flat tubes 2 for setting The fins 3 and, generally, the flat tubes 2 are arranged vertically.

The fin 3 has a larger heat exchange area, which can better exchange heat with the air during ventilation. In addition, it also has the effect of accelerating drainage. Specifically, corrugated fins can be used, and the fins can be arranged to facilitate Structures such as windows through which condensate flows.

The flat tubes 2 and the fins 3 form the heat exchange main body of the heat exchanger, and generally, the heat exchange main body is a flat plate-shaped structure. Here, due to the special shape of the flat tubes 2, the heat exchange body is divided into two parts parallel to each other along the drainage direction. The flat tubes 2 of the two parts are still the same set of flat tubes, but the middle part of the flat tubes 2 is uniformly bent. , so that the heat exchange body is divided from the middle into two parts that are staggered in the drainage direction, that is, the heat exchange body part of the heat exchanger changes from one layer to two staggered layers, and the drainage channels are independent of each other.

As for the bending part, the fins 3 may or may not be provided between the flat tubes 2 . If it is desired to make full use of the flat tubes 2 at the bending position, fins 3 can be installed between the flat tubes 2 at the bending position by inserting or the like.

In addition, fins 3 with different pitches can also be selected on the two parts of the heat exchange body according to their respective heat exchange characteristics, so as to optimize heat exchange and drainage at the same time.

The micro-channel heat exchanger can greatly improve the drainage effect, and the micro-channel heat exchanger with good drainage effect will significantly slow down the frosting speed under the outdoor low-temperature and high-humidity conditions, and can retain sufficient effective heat exchange area, thereby improving the efficiency of heat exchange. thermal efficiency, and greatly reduce energy consumption. At the same time, during defrosting, condensed water can be discharged from the surface of the heat exchanger as soon as possible, reducing the impact on the next cycle, expanding the application field of microchannel heat exchangers, and facilitating the development of more Many new products.

What needs to be explained here is that before the microchannel heat exchanger is assembled, its flat tubes 2 have been processed and formed, and they can be directly connected to the header 1 and fins 3 by welding during assembly, not after assembly. It is formed by bending and twisting as a whole. In this point, it is obviously different from the existing heat exchanger assembly process.

Please refer to Fig. 8, Fig. 9 and Fig. 10. Fig. 8 is a front view of the water guide plate installed on the microchannel heat exchanger shown in Fig. 7; Fig. 9 is a side view of Fig. 8; Fig. 10 is a top view of Fig. 8 .

When the flat tube 2 in the above-mentioned second embodiment is used to form a microchannel heat exchanger, since the straight tube parts of the flat tube 2 are aligned with each other in the length direction, in order to prevent the condensed water discharged from the upper part from entering the lower part, it is also possible to Drainage components such as water guide plate 4 (or water guide sheet) are arranged between the two parts.

As shown in the figure, the water guide plate 4 is an integral flat plate, which is successively divided into a horizontal section 4-1, an inclined section 4-2 and a water tank section 4-3 along the drainage direction, and the horizontal section 4-1 is connected to the drainage section of the bending part. position, the inclined section 4-2 extends obliquely downward at an angle of 45 degrees, and the sink section 4-3 is semicircular. After installing the water guide plate 4, the condensed water discharged from the upper part gathers in the horizontal section 4-1 and flows along The inclined surface of the inclined section 4-2 enters the sink section 4-3, and finally discharges from both ends of the sink section 4-3 without entering the lower part, so that the upper and lower drainage channels remain independent of each other. For the rest of the structure, please refer to the above , it will not be repeated.

Of course, the above-mentioned water guide plate 4 can also be installed on the microchannel heat exchanger shown in Figure 7, that is, no matter whether the straight pipe part of the flat tube 2 is misaligned, the water guide plate 4 can be installed to further improve its drainage performance .

The flat tube of the heat exchanger and the microchannel heat exchanger provided by the utility model have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present utility model, and the descriptions of the above embodiments are only used to help understand the core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made to the utility model, and these improvements and modifications also fall into the protection of the claims of the utility model. within range.

Claims (10)

1. A flat tube of a heat exchanger, which is flat and elongated, is provided with a plurality of microchannels communicating with both ends, and is characterized in that the flat tube (2) includes at least two sections of straight tube parts, and is located at A bent portion (2-3) between two adjacent straight pipe portions, the bent portion (2-3) has at least two bending angles formed by bending and twisting. 2. The heat exchanger flat tube according to claim 1, characterized in that, each of the straight tube parts is located in the same plane and extends in the length direction of the flat tube (2). 3. The heat exchanger flat tube according to claim 2, characterized in that, the straight tube parts are aligned or misaligned with each other in the length direction of the flat tube (2). 4. The heat exchanger flat tube according to claim 1, characterized in that, the bending part (2-3) has two bending angles, and the straight tube parts at both ends are in a "Z" shape as a whole . 5. The heat exchanger flat tube according to claim 1, characterized in that, the bending part (2-3) has four bending angles, forming a "U" shape between the straight tube parts at its two ends bending part. 6. The heat exchanger flat tube according to any one of claims 1 to 5, characterized in that, the range of the bending angle is greater than or equal to 0° and less than 180°. 7. a kind of microchannel heat exchanger, comprise header (1), flat tube (2) and fin (3), described header (1) is arranged on the two ends of described flat tube (2), so The flat tubes (2) are arranged in parallel between the headers (1), and the fins (3) are arranged between adjacent flat tubes (2), characterized in that the flat tubes ( 2) It is the heat exchanger flat tube described in any one of claims 1 to 6 above. 8. The microchannel heat exchanger according to claim 7, characterized in that, the bent portion (2-3) is provided with drainage components and/or fins (3). 9. The microchannel heat exchanger according to claim 8, characterized in that, the drainage component is a water guide plate (4) or a water guide sheet. 10. The microchannel heat exchanger according to claim 9, characterized in that, the water guiding plate (4) is an integral flat plate, which is successively divided into a horizontal section (4-1), an inclined section (4-1) along the drainage direction -2) and the tank section (4-3); the horizontal section (4-1) is connected to the drainage part of the bending part (2-3).