CN215637946U - Multilayer surface cooler structure and air handling unit - Google Patents

Abstract

The utility model relates to an air treatment technical field discloses a multilayer surface cooler structure, includes: a plurality of surface coolers are vertically stacked; the middle water receiving structural part is arranged at the bottom of the air outlet side of the upper surface air cooler on the upper layer; the edge of the first side wall of the middle water receiving structural part is not lower than the horizontal plane where the bottom surface of the corresponding upper surface air cooler is located; wherein, the first lateral wall is the lateral wall of the air-out side of keeping away from the upper surface cooler. When the condensed water is brought out by the wind flow, the water floating phenomenon can not occur, the condensed water brought out by the wind flow can directly fall into the corresponding middle water receiving structural member, the water floating phenomenon of the surface air cooler is avoided, and the water leakage of the air-conditioning box is further avoided. The application also discloses an air handling unit.

Description

Multilayer surface cooler structure and air handling unit

Technical Field

The application relates to the technical field of air treatment, for example, relate to a multilayer surface cooler structure and air treatment unit.

Background

To combination formula air treatment unit, the one deck surface cooler can't satisfy the heat transfer demand of unit, receives the restriction of machining capacity and unit occupation space simultaneously for generally adopting at present and satisfying the heat transfer demand with a plurality of surface coolers in vertical superimposed mode, constitute multilayer surface cooler, the comdenstion water accessible self action of gravity that produces on the multilayer surface cooler flows to in the water collector of bottommost setting along the fin of surface cooler. The bottom of current surface cooler has the backplate, and the backplate has a take the altitude, plays the guard action, but the setting up of backplate makes the surface cooler bottom can gather certain comdenstion water, difficult discharge. For the surface air cooler located on the upper layer, the condensed water accumulated at the bottom of the surface air cooler can be blown out under the driving of the air outlet to generate a water floating phenomenon, and the condensed water falls to the outside of the water receiving tray to cause the water leakage of the air conditioning box. To this problem, present conventional means is that increase the water collector and reduce the risk that the air conditioning box leaked at the ascending width of wind current flow direction, but, need increase the width of air conditioning box when increasing the ascending width of wind current flow direction of water collector, improved manufacturing cost on the one hand, on the other hand, increased the transportation degree of difficulty and the area of unit, caused the wasting of resources.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: for the surface air cooler located on the upper layer, the condensed water accumulated at the bottom of the surface air cooler can be blown out under the driving of the air outlet to generate a water floating phenomenon, and the condensed water falls to the outside of the water receiving tray to cause the water leakage of the air conditioning box.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a multilayer surface cooler structure and an air handling unit, and aims to solve the problem that condensed water accumulated at the bottom of a surface cooler on an upper layer is blown out under the driving of air outlet to generate a water floating phenomenon and falls outside a water receiving disc to cause water leakage of an air conditioning box.

In some embodiments, the multilayer surface cooler structure comprises: a plurality of surface coolers are vertically stacked; the middle water receiving structural part is arranged at the bottom of the air outlet side of the upper surface air cooler on the upper layer; the edge of the first side wall of the middle water receiving structural part is not lower than the horizontal plane where the bottom surface of the corresponding upper-layer surface air cooler is located; wherein, first lateral wall is for keeping away from the lateral wall of the air-out side of upper surface cooler.

Optionally, the surface air cooler includes a first bottom guard plate, and the first bottom guard plate is disposed on a bottom plate on an air outlet side of the surface air cooler; the edge of the second side wall of the middle water receiving structural member does not exceed the edge of the first bottom guard plate; the second side wall is a side wall arranged on the bottom of the air outlet side of the upper surface air cooler.

Optionally, the level of the edge of the first side wall is not lower than the level of the edge of the second side wall.

Optionally, the multilayer surface air cooler structure further comprises: and the air inlet side baffle is arranged at the bottom of the air inlet side of the upper surface cooler on the upper layer.

Optionally, the wind-inlet side baffle comprises: the fixing part is connected with the bottom of the air inlet side of the upper surface cooler; and a shielding part which inclines towards the air inlet side.

Optionally, the inclination angle of the shielding portion of the air inlet side baffle is 30 ° to 70 °.

Optionally, the multilayer surface air cooler structure further comprises: the water receiving tray is internally provided with a plurality of vertically superposed surface air coolers, and the air inlet sides of the surface air coolers are close to one side wall of the water receiving tray; the width of the water receiving tray in the flowing direction of the air flow is 1.5-3 times of the thickness of the surface air cooler.

Optionally, an extending blocking edge inclined to the air inlet side is arranged on the air inlet side wall of the water receiving tray.

Optionally, the multilayer surface air cooler structure further comprises: further comprising: and the first end of the middle water drainage pipe is communicated with the middle water receiving structural part, and the second end of the middle water receiving structural part is used for discharging condensed water in the middle water receiving structural part to the outside or the second end of the middle water receiving structural part is arranged in a water receiving tray at the bottom of the multilayer surface cooler structure.

In some embodiments, the air handling unit comprises a multi-layer surface air cooler structure as described in any of the preceding claims.

The multilayer surface cooler structure and the air handling unit that this disclosed embodiment provided can realize following technological effect:

in the multilayer surface cooler structure of the embodiment of the disclosure, water receiving structure spare in the middle of the bottom of the air-out side of upper surface cooler sets up, the partial comdenstion water that produces by this upper surface cooler can flow into this middle water receiving structure spare under the action of gravity in, and the height at the border of the first lateral wall of middle water receiving structure spare has been injectd, make when the comdenstion water is taken out by the distinguished and admirable, the phenomenon of wafing can not appear, the comdenstion water that is taken out by distinguished and admirable can directly fall into corresponding middle water receiving structure spare, the phenomenon of wafing of surface cooler has been avoided, and then the emergence that the air-conditioning box leaked has been avoided.

Compared with the first width of the water pan arranged in the conventional multilayer surface cooler structure, the first width of the water pan of the multilayer surface cooler structure provided by the embodiment of the disclosure can be reduced; or the size structure of the water receiving tray corresponding to the existing single-layer surface cooler structure can be kept; and then can reduce the length of air-conditioning box or avoid the change of the size of air-conditioning box, practice thrift or can not increase manufacturing cost, and reduce or do not increase the transportation degree of difficulty and the area of unit, avoid the wasting of resources.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic structural diagram of a multilayer surface cooler provided in an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of another multilayer surface cooler provided in the embodiments of the present disclosure;

FIG. 3 is a schematic structural diagram of an air inlet side baffle plate in a multilayer surface cooler provided by the embodiment of the disclosure;

fig. 4 is a schematic structural diagram of a conventional multilayer surface cooler according to an embodiment of the present disclosure.

Reference numerals:

10. a surface cooler; 11. an upper surface cooler; 12. a bottom layer surface cooler;

20. the middle water receiving structural part; 21. a first side wall; 22. a second side wall;

30. an air inlet side baffle plate; 31. a fixed part; 32. a shielding portion;

40. a water pan; 41. extending the blocking edge; 40', a water receiving tray I;

50. a middle drain pipe; 51. and fixing the structural part.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

With reference to fig. 1 to 4, an embodiment of the present disclosure provides a multilayer surface air cooler structure, including a plurality of surface air coolers 10 and an intermediate water receiving structure 20, where the plurality of surface air coolers 10 are vertically stacked, and the intermediate water receiving structure 20 is disposed at the bottom of an air outlet side of an upper layer surface air cooler 11 located on an upper layer; the edge of the first side wall 21 of the middle water receiving structural part 20 is not lower than the horizontal plane p where the bottom surface of the corresponding upper-layer surface air cooler 11 is located; the first side wall 21 is a side wall far from the air outlet side of the upper surface air cooler 11.

In the multilayer surface cooler structure of the embodiment of the present disclosure, the bottom of the air outlet side of the upper surface cooler 11 is provided with the middle water receiving structure 20, part of the condensed water generated by the upper surface cooler 11 can flow into the middle water receiving structure 20 under the action of gravity, and the height of the edge of the first side wall 21 of the middle water receiving structure 20 is limited, so that when the water floating phenomenon occurs, the condensed water brought out by the air outlet can fall into the corresponding middle water receiving structure 20, and the occurrence of water leakage of the air conditioning box is avoided.

In the embodiment of the present disclosure, the intermediate water receiving structure 20 is disposed at the bottom of the air outlet side of the upper surface air cooler 11 along the longitudinal direction of the surface air cooler 10. That is, the middle water receiving structure 20 is arranged along the horizontal direction, and the width of the middle water receiving structure in the horizontal direction is not less than the longitudinal width of the upper surface air cooler 11, so that the whole longitudinal bottom of the upper surface air cooler 11 is ensured to be connected with the middle water receiving structure 20. The width of the middle water receiving structural member 20 in the flowing direction of the wind current is not limited, so as to ensure that the condensed water falls into the middle water receiving structural member, and the width is determined according to actual conditions.

In the embodiment of the present disclosure, when the condensed water accumulated at the bottom of the upper surface cooler 11 is taken out by the outlet air, the movement track of the condensed water is in the shape of a curve on the right side of the symmetry axis of a parabola, so that it can be ensured that the condensed water taken out by the outlet air falls into the middle water receiving structural member 20 as long as the edge of the first side wall 21 of the middle water receiving structural member 20 is not lower than the horizontal plane p where the bottom surface of the corresponding upper surface cooler 11 is located.

Optionally, the edge of the first side wall 21 of the intermediate water receiving structure 20 is not lower than the level of the corresponding edge of the bottom protection plate of the upper surface air cooler 11. The condensed water brought out by the outlet air is better received.

Optionally, the edge of the first side wall 21 of the intermediate water receiving structure 20 is higher than the level of the edge of the bottom protection plate of the corresponding upper surface air cooler 11.

In the embodiment of the present disclosure, the upper surface air coolers 11 located at the upper layer of the plurality of surface air coolers 10 are the upper surface air coolers 11 except the bottom surface air cooler 12 located at the bottommost layer, that is, the number of the upper surface air coolers 11 is one or more, depending on the number of the layers of the multilayer surface air cooler 10. The number of the intermediate water receiving structural members 20 is the same as that of the upper-layer surface coolers 11, namely, the bottom of the air outlet side of each upper-layer surface cooler 11 is provided with one intermediate water receiving structural member 20.

In some embodiments, the surface cooler 10 includes a first bottom cover (not shown) disposed on a bottom plate of the air-out side of the surface cooler 10; the edge of the second side wall 22 of the intermediate water receiving structure 20 does not exceed the edge of the first bottom guard plate; the second sidewall 22 is a sidewall disposed on the bottom of the air outlet side of the upper surface air cooler 11. The second side wall 22 of the middle water receiving structure 20 is prevented from affecting the drainage of the condensed water.

Optionally, the intermediate water receiving structure 20 is trough-shaped, and the two opposite side walls in the width direction are a first side wall 21 and a second side wall 22. The first side wall 21 is fixedly connected with the bottom of the air outlet side of the upper surface air cooler 11 in a contact manner.

In some embodiments, the level of the edge of the first side wall 21 is not lower than the level of the edge of the second side wall 22. The condensed water brought out by the outlet air is better received.

Optionally, the bottom wall of the intermediate water receiving structure 20 is inclined, and the horizontal height of the bottom wall far away from the upper surface air cooler 11 side is lower than the height of the bottom wall close to the upper surface air cooler 11 side. The storage capacity of the condensed water is increased, and the condensed water is prevented from flowing back to the bottom of the upper surface air cooler 11.

Optionally, the diapire of middle water receiving structure 20 is the echelonment, and the diapire of keeping away from upper surface cooler 11 side is the low step, and the diapire that is close to upper surface cooler 11 side is the high step.

Optionally, the intermediate water receiving structure 20 includes an intermediate water tray, and the specific structure may refer to an existing water tray structure.

In some embodiments, the bottom surface of the intermediate water receiving structure 20 is not lower than the edge of the upper protective plate of the surface cooler on the lower layer. The air outlet area of the surface cooler on the lower layer is not blocked, and the heat exchange quantity and the heat exchange efficiency are ensured. As shown in fig. 1, the bottom surface of the intermediate water receiving structure member 20 is not lower than the edge of the upper protective plate of the bottom surface cooler 12 in level.

In some embodiments, as shown in fig. 1 and 3, the multi-layer surface cooler structure further includes an inlet side baffle 30 disposed at the bottom of the inlet side of the upper surface cooler 11 located at the upper layer. When the air return occurs, the condensed water accumulated at the bottom of the upper surface air cooler 11 or the condensed water in the middle water receiving structural part 20 can be effectively prevented from being brought to the air inlet side by the air return and flowing out, so that the water leakage of the air conditioning box is avoided.

Alternatively, the air inlet side baffle 30 includes a fixing portion 31 and a shielding portion 32, the fixing portion 31 is connected to the bottom of the air inlet side of the upper surface cooler 11, and the shielding portion 32 is inclined toward the air inlet side. In the present embodiment, the wind inlet side baffle 30 has a substantially V-shape, and one side wall is a fixing portion 31 and the other side wall is a shielding portion 32. Alternatively, as shown in fig. 3, the width d1 of the fixing portion 31 is smaller than the width d2 of the shielding portion 32. Alternatively, the width of the fixing portion 31 is the same as the height of the guard plate provided on the bottom plate on the air inlet side of the surface cooler 10.

Alternatively, as shown in fig. 3, the shielding portion 32 of the air intake side baffle 30 may have an inclination angle α of 30 ° to 70 °. In this embodiment, the inclination angle α is an included angle between the shielding portion 32 and the air inlet surface of the upper surface cooler 11. The air inlet is not too small, otherwise, the air inlet is influenced; should not be too large, otherwise it cannot play the role of water-retaining.

Alternatively, the inclination angle α of the shielding portion 32 of the inlet side baffle 30 is 45 ° to 60 °. The inclination angle alpha can effectively balance the water retaining effect and the air inlet effect in the inner chamber in the range.

Optionally, the inclination angle α of the shielding portion 32 of the wind-inlet side baffle 30 is any angle within the range of 30 °, 45 °, 50 °, 60 °, 70 ° or [30 °, 70 ° ].

In some embodiments, the multi-layer surface cooler structure further comprises a water receiving tray 40, wherein a plurality of surface coolers 10 which are vertically stacked are arranged in the water receiving tray 40, and the air inlet sides of the plurality of surface coolers 10 are close to one side wall of the water receiving tray 40; the first width D of the water pan 40 in the flowing direction of the wind flow is 1.5-3 times of the thickness h of the surface air cooler 10. In this embodiment, the thickness of the surface cooler 10 may be the thickness of the bottom surface cooler 12, or the thickness of the upper surface cooler 11. In general, the thickness of the plurality of surface coolers 10 is uniform in the multi-layer surface cooler structure. That is, after setting up middle water receiving structure 20, compare the first width D 'of the water collector I40' that present multilayer surface cooler structure set up (as shown in FIG. 4, at present, in order to avoid upper comdenstion water to waft water and lead to the air conditioner case to leak, generally solve through the technological means that increases the first width D 'of water collector I40'), the first width of the water collector 40 of the multilayer surface cooler structure of this embodiment can reduce, thereby can reduce the length of air conditioner case, practice thrift manufacturing cost, reduce the transportation degree of difficulty and the area of occupation of land of unit, avoid the wasting of resources. Or the water pan 40 of the multilayer surface air cooler structure of the embodiment of the disclosure may maintain the size structure of the water pan corresponding to the existing single-layer surface air cooler structure; and then can avoid the change of the size of air-conditioning box, can not increase manufacturing cost, and does not increase the transportation degree of difficulty and the area of occupation of land of unit, avoid the wasting of resources.

Optionally, the first width D of the water pan 40 in the flowing direction of the wind flow is 0.8-2.5 times the thickness h of the surface air cooler 10.

Optionally, the first width D of the water collector 40 in the flow direction of the wind flow is 2 times the thickness h of the surface air cooler 10.

Optionally, as shown in fig. 2, an extending blocking edge 41 inclined to the wind inlet side is provided on the wind inlet side wall of the water pan 40. In this embodiment, when the air return occurs, the extending blocking edge 41 can effectively prevent the condensed water in the water pan 40 or the condensed water accumulated at the bottom of the bottom surface air cooler 12 from being brought to the air inlet side by the air return and flowing out, which causes water leakage of the air conditioning cabinet.

In this embodiment, the inclination angle β of the extension stopper 41 is 30 ° to 70 °. In this embodiment, the inclination angle β is an included angle between the extending blocking edge 41 and the air inlet surface of the bottom-layer surface air cooler 12. The air inlet is not too small, otherwise, the air inlet is influenced; should not be too large, otherwise it cannot play the role of water-retaining.

Optionally, the inclination angle β of the extending edge 41 is 45 ° to 60 °. The inclination angle beta can effectively balance the water retaining effect and the air inlet effect in the inner chamber in the range.

Optionally, the inclination angle β of the extending edge 41 is any angle within the range of 30 °, 45 °, 50 °, 60 °, 70 ° or [30 °, 70 ° ].

In some embodiments, as shown in fig. 1, the multi-layer surface cooler structure further includes an intermediate drain pipe 50, a first end of which is communicated with the intermediate water receiving structure 20, and a second end of which is used for draining the condensed water in the intermediate water receiving structure 20 to the outside, or a second end of which is arranged in the water receiving tray 40 at the bottom of the multi-layer surface cooler structure. The condensed water in the middle drain pipe 50 is discharged in time, and the condensed water is prevented from being retained at the bottom of the upper surface air cooler 11 to influence the heat exchange performance.

In this embodiment, the first end of the intermediate water drainage pipe 50 is communicated with the lowest horizontal position of the bottom wall of the intermediate water receiving structure 20. The condensed water in the intermediate water receiving structure 20 can enter the intermediate drain pipe 50 to be discharged.

Optionally, when the bottom wall of the intermediate water receiving structure 20 is inclined or stepped, the first end of the intermediate water discharging pipe 50 is communicated with the bottom wall of the intermediate water receiving structure 20 far away from the upper surface air cooler 11.

Alternatively, the intermediate drain pipe 50 employs a plastic pipe, for example, a random copolymer polypropylene pipe (PPR pipe), a polypropylene pipe (PP pipe), or the like.

Optionally, a second end of the intermediate drain pipe 50 is disposed within the drip tray 40 at the bottom of the multi-layer surface cooler structure. Avoid setting up more outer condensed water pipeline of arranging.

Optionally, the end of the intermediate drain pipe 50 adjacent to the drip tray 40 is provided with a fixing structure 51 for fixing the intermediate drain pipe 50. Avoid rocking in the transportation, reduce life. And the shaking caused during the drainage reduces the noise caused by the shaking and improves the user experience.

In the present embodiment, the structural form of the fixed structure 51 is not limited. Alternatively, the fixing structure 51 is an "L" shaped structure, one side wall is fixedly disposed on the bottom surface cooler 12, and the other side wall is provided with a fixing position for fixing the intermediate drain pipe 50. For example, the fixing station may be a fixing ring through which the middle drain pipe 50 passes and is fixed inside the fixing ring.

In the embodiment of the present disclosure, fig. 1 only shows a multi-layer surface cooler structure having two layers of surface coolers, and for a multi-layer surface cooler structure having three or more layers, the intermediate water receiving structural member 20, the air inlet side baffle 30, the intermediate water discharging pipe 50, and other structural members may be stacked layer by layer according to the number of layers of the surface coolers.

With reference to fig. 1 to 3, an embodiment of the present disclosure provides an air handling unit including the multilayer surface cooler structure of any one of the foregoing embodiments.

The air handling unit of the disclosed embodiments includes a combined air conditioning unit.

After adopting the multilayer surface cooler structure of this disclosed embodiment, compare the first width D 'of water collector I40' that present multilayer surface cooler structure set up (as shown in fig. 4, at present in order to avoid upper comdenstion water to waft the water and lead to the air conditioner case to leak, generally solve through the means of increasing the first width D 'of water collector I40'), first width D of water collector 40 of the multilayer surface cooler structure of this disclosed embodiment can reduce, thereby can reduce the length of air conditioner case, practice thrift manufacturing cost, reduce the transportation degree of difficulty and the area of unit, avoid the wasting of resources. Or the water pan 40 of the multilayer surface air cooler structure of the embodiment of the disclosure may maintain the size structure of the water pan corresponding to the existing single-layer surface air cooler structure; and then avoid the change of the size of air conditioning case, can not increase manufacturing cost, and do not increase the transportation degree of difficulty and the area of occupation of land of air handling unit, avoid the wasting of resources.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A multi-layer surface cooler structure, comprising:

a plurality of surface coolers are vertically stacked;

the middle water receiving structural part is arranged at the bottom of the air outlet side of the upper surface air cooler on the upper layer;

the edge of the first side wall of the middle water receiving structural part is not lower than the horizontal plane where the bottom surface of the corresponding upper-layer surface air cooler is located; the first side wall is far away from the air outlet side of the upper surface air cooler.

2. The multi-layer surface air cooler structure of claim 1, wherein the surface air cooler comprises a first bottom cover sheet disposed on a bottom sheet of an air-out side of the surface air cooler; the edge of the second side wall of the middle water receiving structural member does not exceed the edge of the first bottom guard plate; the second side wall is a side wall arranged at the bottom of the air outlet side of the upper surface air cooler.

3. The multi-layer surface cooler structure of claim 2, wherein a level of an edge of the first sidewall is not lower than a level of an edge of the second sidewall.

4. The multilayer surface cooler structure of claim 1, 2 or 3, further comprising:

and the air inlet side baffle is arranged at the bottom of the air inlet side of the upper surface cooler on the upper layer.

5. The multi-layer surface cooler structure of claim 4, wherein the inlet side baffle comprises:

the fixing part is connected with the bottom of the air inlet side of the upper surface cooler;

and a shielding part which inclines towards the air inlet side.

6. The structure of a multilayer surface air cooler according to claim 5, wherein the angle of inclination of the shielding portion of the air intake side baffle is 30 ° to 70 °.

7. The multilayer surface cooler structure of claim 1, 2 or 3, further comprising:

the water receiving tray is internally provided with a plurality of vertically superposed surface air coolers, and the air inlet sides of the surface air coolers are close to one side wall of the water receiving tray; the width of the water receiving tray in the flowing direction of the air flow is 1.5-3 times of the thickness of the surface air cooler.

8. The structure of the multilayer surface air cooler as set forth in claim 7, wherein the side wall of the water pan on the air inlet side is provided with an extended retaining edge inclined toward the air inlet side.

9. The multilayer surface cooler structure of claim 1, 2 or 3, further comprising: further comprising:

and the first end of the middle water drainage pipe is communicated with the middle water receiving structural part, and the second end of the middle water receiving structural part is used for discharging condensed water in the middle water receiving structural part to the outside or the second end of the middle water receiving structural part is arranged in a water receiving tray at the bottom of the multilayer surface cooler structure.

10. An air handling unit comprising a multi-layer surface cooler structure according to any one of claims 1 to 9.

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