CN106369881B - Microchannel heat exchanger and air conditioner - Google Patents

Abstract

The invention relates to the technical field of air conditioners, in particular to a micro-channel heat exchanger and an air conditioner. The microchannel heat exchanger comprises a flat tube structure and a fin structure, wherein the flat tube structure comprises a plurality of flat tubes, the fin structure comprises a plurality of fins arranged between adjacent flat tubes, the flat tube structure is provided with a water guide groove, the water guide groove is positioned on the air outlet side of the flat tube structure along the direction of airflow flowing through the microchannel heat exchanger, and the water guide groove can guide water on the flat tubes and the fins. In the invention, the water chute can prevent the condensed water from being shielded by the self structure of the micro-channel heat exchanger, so that the condensed water can be discharged in time, and the condensation and frosting phenomena of the micro-channel heat exchanger caused by the shielded condensed water can be effectively relieved.

Description

Microchannel heat exchanger and air conditioner

Technical Field

The invention relates to the technical field of air conditioners, in particular to a micro-channel heat exchanger and an air conditioner.

Background

Due to the advantages of high heat exchange performance, compact structure, low cost and the like, the micro-channel heat exchanger is widely applied to commercial and household refrigeration air conditioners. However, the conventional microchannel heat exchanger also has two problems of condensation and frost formation, as well as other heat exchangers, and the problems of condensation and frost formation are more serious than those of other heat exchangers (such as a tube-fin heat exchanger), especially when the microchannel heat exchanger is used as an outdoor unit condenser.

Because the condensed water accumulated on the surface of the heat exchanger can form larger heat transfer resistance and seriously restrict the heat transfer performance of the heat exchanger, the condensation and frost formation of the microchannel heat exchanger are inhibited, the frequency of the condensation and frost removal of the microchannel heat exchanger is reduced, the time of the condensation and frost removal is shortened, and the method is very important for further improving the performance of the microchannel heat exchanger and further popularizing the wide application of the microchannel heat exchanger.

According to research, the shielding of the structure of the micro-channel heat exchanger on the condensate water is one of the important reasons for the problems. Based on current microchannel heat exchanger structure, no matter flat pipe is vertical placing or level is placed, the comdenstion water on the microchannel heat exchanger all can be owing to sheltered from and can't smoothly flow down, wherein, the comdenstion water can be sheltered from by the fin when flat pipe is vertical placing, the comdenstion water can be sheltered from by flat pipe self when flat pipe level is placed, and the comdenstion water that is sheltered from can gather on microchannel heat exchanger surface, lead to condensation and the phenomenon of frosting, and membranous or pearl water droplet can form the required core of frosting again, further aggravate the phenomenon of frosting.

Disclosure of Invention

The invention aims to solve the technical problems that: and the condensation and frosting phenomena of the micro-channel heat exchanger caused by the shielding of the condensed water are relieved.

In order to solve the technical problem, the invention provides a micro-channel heat exchanger in a first aspect. The microchannel heat exchanger comprises a flat tube structure and a fin structure, wherein the flat tube structure comprises a plurality of flat tubes, and the fin structure comprises a plurality of fins arranged between adjacent flat tubes.

Optionally, the water chute is arranged adjacent to one end of the fin on the air outlet side, and the end of the fin on the air outlet side is located at the upstream of the water chute along the direction of the airflow flowing through the microchannel heat exchanger, so that the water chute can drain water on the fin; or the micro-channel heat exchanger further comprises an auxiliary flow guide structure arranged between the water guide groove and the fins, and the auxiliary flow guide structure is used for guiding water on the fins to the water guide groove so that the water guide groove can guide the water on the fins.

Optionally, the water chute is vertically arranged, and/or the plurality of flat pipes are vertically arranged.

Optionally, each flat pipe of the flat pipe structure is provided with a water guide groove.

Optionally, the microchannel heat exchanger still includes the grid, and the grid setting is in flat tubular construction and is located flat tubular construction's air-out one side, and the contact forms the guiding gutter between grid and the flat pipe.

Optionally, the grid includes first grid, and first grid has the contact surface of laminating mutually with flat tub of air-out side surface, and the edge of contact surface forms the guiding gutter with the contact department of flat tub of air-out side surface.

Optionally, the contact surface is an arcuate concave surface.

Optionally, the grid includes a plurality of first grid bars, and the plurality of first grid bars and the plurality of flat pipes are arranged in a one-to-one correspondence manner.

Optionally, the grid can be dismantled with flat tubular construction and be connected.

The invention also provides an air conditioner in a second aspect. The air conditioner comprises the micro-channel heat exchanger.

Because the water guide groove capable of guiding the water on the flat tube and the fin is arranged on the air outlet side of the flat tube structure, in the working process of the microchannel heat exchanger, the water on the flat tube and the fin can flow into the water guide groove under the blowing action of airflow and the adhesion force between the water, and flow out of the microchannel heat exchanger under the guiding action of the water guide groove. Therefore, in the invention, the water chute can prevent the condensed water from being shielded by the self structure of the micro-channel heat exchanger, so that the condensed water can be discharged in time, and the condensation and frosting phenomena of the micro-channel heat exchanger caused by the shielded condensed water can be effectively relieved.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 shows a top cross-sectional view of a microchannel heat exchanger according to an embodiment of the invention.

Fig. 2 shows a top sectional view of the grid shown in fig. 1.

Fig. 3 shows a cross-sectional view a-a of fig. 2.

FIG. 4 shows a side view (against the direction of the incoming air) of the grille shown in FIG. 1.

In the figure:

1. flat tubes; 2. a fin; 3. a grid; 31. a first grid; 311. a contact surface; 32. a frame; 321. a left frame; 322. a lower frame; 323. a right frame; 324. an upper frame; 325. a threaded hole; 4. a water chute.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

In the description of the present invention, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for the convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present invention.

Fig. 1-4 illustrate one embodiment of a microchannel heat exchanger of the present invention. The microchannel heat exchanger comprises a flat tube structure and a fin structure, wherein the flat tube structure comprises a plurality of flat tubes 1, the fin structure comprises a plurality of fins 2 arranged between adjacent flat tubes 1, a water guide groove 4 is arranged on the flat tube structure, the water guide groove 4 is positioned on the air outlet side of the flat tube structure along the direction of airflow flowing through the microchannel heat exchanger, and the water guide groove 4 can guide water on the flat tubes 1 and the fins 2.

Because the water guide groove 4 capable of guiding the water on the flat tube 1 and the fin 2 is arranged on the air outlet side of the flat tube structure, in the working process of the microchannel heat exchanger, the water on the flat tube 1 and the fin 2 can flow into the water guide groove 4 under the blowing action of the airflow and the adhesion force between the water, and flow out of the microchannel heat exchanger under the guiding action of the water guide groove 4. Therefore, in the invention, the water chute 4 can prevent the condensed water from being shielded by the self structure of the micro-channel heat exchanger, so that the condensed water can be discharged in time, the condensation and frosting phenomena of the micro-channel heat exchanger caused by the shielded condensed water can be effectively relieved, and the influence and restriction of the condensation and frosting on the heat exchange performance of the micro-channel heat exchanger are reduced.

As an embodiment that the water chutes 4 on the flat tubes 1 can simultaneously guide the water on the fins 2, the microchannel heat exchanger may further include an auxiliary flow guiding structure (e.g., an auxiliary water chute) disposed between the water chutes 4 and the fins 2, where the auxiliary flow guiding structure is configured to guide the water on the fins 2 to the water chutes 4. On the basis, the condensed water on the fins 2 can flow to the water chute 4 through the auxiliary flow guide structure and then flow out of the water chute 4 to the outside of the microchannel heat exchanger, so that the water chute 4 can also guide the water on the fins 2.

As another embodiment that the water chute 4 on the flat tube 1 can drain water on the fin 2 at the same time, the water chute 4 may be disposed adjacent to one end of the fin 2 on the air outlet side, and the one end of the fin 2 on the air outlet side is located on the upstream of the water chute 4 along the direction of the air flow flowing through the microchannel heat exchanger. Based on this kind of mode, the comdenstion water on the fin 2 also can flow down to in the guiding gutter 4 under the action of the blowing of air current and the adhesion power between the comdenstion water to make guiding gutter 4 carry out the drainage to the water on the fin 2, accelerate the discharge of the comdenstion water on the whole microchannel heat exchanger, reduce and gather, alleviate condensation and frosting.

In the present invention, the arrangement of the water chute 4 is various, for example, the water chute may be vertically arranged, may also be obliquely arranged downwards, or may also be arranged in a bent manner, wherein the vertical arrangement is preferred because the condensed water flowing to the water chute 4 can flow down more smoothly under the action of gravity. In addition, when the microchannel heat exchanger is used, the flat pipes 1 can be vertically arranged or horizontally arranged, and under the two conditions, the water chute 4 can guide the condensed water, so that the condensation and frosting phenomena of the microchannel heat exchanger caused by the shielded condensed water are effectively relieved.

The invention will be further described with reference to the embodiments shown in fig. 1-4. In this embodiment, be equipped with guiding gutter 4 on each flat pipe 1 of flat tubular construction respectively, can further alleviate microchannel heat exchanger's condensation and frosting phenomenon like this.

As shown in fig. 1 to 4, in this embodiment, the microchannel heat exchanger includes a flat tube structure having a plurality of flat tubes 1, a fin structure having a plurality of fins 2, and a grid 3, wherein the fins 2 are disposed between adjacent flat tubes 1, the grid 3 is disposed on the flat tube structure and located on the air outlet side of the flat tube structure, and the grid 3 and the flat tubes 1 are in contact with each other to form a water chute 4.

It can be seen that, in this embodiment, the guiding gutter 4 is formed through the contact between the grid 3 that adds and the flat pipe 1, owing to need not to change the structure of flat pipe 1 and fin 2 self, consequently, the structure is comparatively simple, and the cost is lower to owing to need not to reduce the heat transfer area of flat pipe 1 and fin 2, consequently, can also prevent that the original heat transfer performance of microchannel heat exchanger from receiving the weakening because of setting up guiding gutter 4.

Specifically, as shown in fig. 1 and fig. 2, in this embodiment, the grille 3 includes a first grille strip 31, and the first grille strip 31 has a contact surface 311 attached to the air outlet side surface of the flat tube 1, and a water chute 4 is formed at a contact position of an edge of the contact surface 311 and the air outlet side surface of the flat tube 1. Wherein, in order to make contact surface 311 and the laminating of flat pipe 1 air-out side surface inseparabler, as shown in fig. 2 and fig. 3, contact surface 311 prefers to set up to the arc concave surface, and contact surface 311 can laminate with the flat pipe 1 air-out side surface that is the arc convex surface inseparabler like this, can strengthen microchannel heat exchanger overall structure's compactedness and fastness on the one hand, and on the other hand also can exert the water conservancy diversion effect of guiding gutter 4 more fully, alleviates condensation and frosting phenomenon more effectively.

In order to guide the condensed water on each flat tube 1, as shown in fig. 1, 2 and 4, in this embodiment, the grille 3 includes a plurality of first bars 31, and the plurality of first bars 31 are disposed in one-to-one correspondence with the plurality of flat tubes 1 of the flat tube structure. Based on this, every first grid 31 all passes through the contact surface 311 with the flat pipe 1 that oneself corresponds, consequently, all be formed with two guiding gutters 4 on every flat pipe 1, thereby the comdenstion water on each flat pipe 1 all can be under the air current blows the effect and between the comdenstion water adhesion effect down flow to guiding gutter 4 in and along guiding gutter 4 outflow, the realization is to the quick discharge of comdenstion water, reduce the gathering of comdenstion water on flat pipe 1, improve microchannel heat exchanger's heat transfer performance.

Furthermore, as can be seen from fig. 1, in this embodiment, the water chute 4 is disposed adjacent to one end of the fin 2 on the air outlet side, and the end of the fin 2 on the air outlet side is located upstream of the water chute 4 along the direction of the airflow flowing through the microchannel heat exchanger, i.e. in the air inlet direction (in fig. 1-4, I represents the air inlet side, O represents the air outlet side, and the direction indicated by the arrow is the air inlet direction, i.e. the direction of the airflow flowing through the microchannel heat exchanger), and the end of the fin 2 on the air outlet side does not exceed the water chute 4. Based on this setting, guiding gutter 4 can also be simultaneously to the water drainage on fin 2, thereby make at microchannel heat exchanger during operation, the comdenstion water homoenergetic on flat pipe 1 and fin 2 can be between the blowing action of air current and the comdenstion water adhesion effect down to guiding gutter 4 in, make the comdenstion water homoenergetic on the whole microchannel heat exchanger discharge fast, can effectively reduce the gathering of comdenstion water, alleviate because of the condensation with frosting to the restriction of microchannel heat exchanger heat transfer performance, and can effectively reduce dew defrosting frequency and shorten dew defrosting time, help further improving microchannel heat exchanger's performance and further promote microchannel heat exchanger's wide application.

Further, as shown in fig. 1 and 4, in this embodiment, the first grid 31 and the flat tube 1 are vertically arranged, and the first grid 31 contacts with the flat tube 1 to form the water chute 4 vertically arranged. The advantage of setting up like this is that under the dual function of air current and gravity, the water that flat pipe 1 wall and fin 2 surface produced can flow into vertical guiding gutter 4 more smoothly to discharge more smoothly under the action of gravity, thereby further accelerate the discharge rate of comdenstion water.

In addition, in order to further increase the overall strength of the grill 3, in the present invention, the grill 3 may further include second grill bars connected to the first grill bars 31 and arranged to cross the first grill bars 31. For example, in this embodiment, a second grill (not shown) may be arranged laterally and connected to the vertically arranged first grill 31. Through setting up the second grid, can further strengthen grid 3's intensity, do not influence the water conservancy diversion effect of guiding gutter 4, and when the microchannel heat exchanger was used as indoor set (the fan was in the air inlet side), can also be through the outward appearance shape and the contained angle relation etc. of the first grid 31 of rational design and second grid, the air supply of can also be in disorder and flow the direction, play the effect that the sense of weakening is bloied.

In this example, grid 3 can dismantle with flat tubular construction and be connected, and the structure that not only need not to change flat tubular construction self like this can form guiding gutter 4 and carry out the drainage to the comdenstion water, alleviates condensation and the problem of frosting, and the processing degree of difficulty is lower moreover, can effectively practice thrift the cost. As shown in fig. 4, the grid 3 of this embodiment further includes a frame 32, and the frame 32 includes a left frame 321, a lower frame 322, a right frame 323, and an upper frame 324, wherein the left frame 321, the lower frame 322, the right frame 323, and the upper frame 324 are sequentially connected and enclose to form the frame 32. The first grid 31 and the second grid are both arranged in the frame 32. Also, screw holes serving as connection portions are provided on the frame 32 so that the grill 3 can be connected and fixed by these screw holes 325. Of course, the connecting portion may have other structures, such as a snap structure, as long as the detachable connection of the grille 3 can be realized.

The micro-channel heat exchanger can be applied to commercial air conditioners and household air conditioners, and can be used as an air conditioner of an indoor unit and an air conditioner of an outdoor unit. Accordingly, the second aspect of the present invention also provides an air conditioner comprising the microchannel heat exchanger of the present invention.

The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims (9)

1. The utility model provides a micro-channel heat exchanger, includes flat tube construction, fin structure and grid (3), flat tube construction includes the flat pipe (1) of several, fin structure includes fin (2) that the several set up between adjacent flat pipe (1), a serial communication port, be equipped with guiding gutter (4) on the flat tube construction, guiding gutter (4) flow through along the air current the direction of micro-channel heat exchanger is located air-out one side of flat tube construction, just guiding gutter (4) can be right flat pipe (1) reaches water on fin (2) carries out the drainage, grid (3) set up flat tube is structural and is located air-out one side of flat tube construction, grid (3) with contact formation between flat pipe (1) guiding gutter (4).

2. The microchannel heat exchanger according to claim 1, wherein the water chute (4) is arranged adjacent to one end of the fin (2) on the air outlet side, and the end of the fin (2) on the air outlet side is located upstream of the water chute (4) in the direction of the airflow flowing through the microchannel heat exchanger, so that the water chute (4) can guide the water on the fin (2); or the microchannel heat exchanger further comprises an auxiliary flow guide structure arranged between the water chute (4) and the fins (2), and the auxiliary flow guide structure is used for guiding water on the fins (2) to the water chute (4) so that the water chute (4) can guide the water on the fins (2).

3. The microchannel heat exchanger according to claim 1, wherein the water chute (4) is vertically arranged and/or the plurality of flat tubes (1) is vertically arranged.

4. The microchannel heat exchanger according to claim 1, wherein the water chute (4) is provided on each flat tube (1) of the flat tube structure.

5. The micro-channel heat exchanger according to claim 1, characterized in that the grid (3) comprises a first grid (31), the first grid (31) has a contact surface (311) attached to the air outlet side surface of the flat tube (1), and the contact position of the edge of the contact surface (311) and the air outlet side surface of the flat tube (1) forms the water chute (4).

6. The microchannel heat exchanger of claim 5, wherein the contact surface (311) is an arcuate concave surface.

7. The microchannel heat exchanger according to claim 5, wherein the grid (3) comprises a plurality of first grid bars (31), and the plurality of first grid bars (31) are arranged in one-to-one correspondence with the plurality of flat tubes (1).

8. The microchannel heat exchanger according to claim 1, wherein the grid (3) is detachably connected to the flat tube structure.

9. An air conditioner comprising the microchannel heat exchanger as recited in any one of claims 1 to 8.

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