Lower air supply air conditioning unit

Abstract

The utility model provides a lower air supply air conditioning unit which comprises an evaporator, a water pan and a water baffle, the water pan is located at the lower end of the evaporator, an air channel allowing airflow to flow through is defined in the evaporator, a ventilation opening is formed in the position, below the air channel, of the water pan, and the water baffle is located below the ventilation opening. The evaporator is arranged in the air duct, the air duct is arranged in the air duct, air flow on the periphery of the evaporator enters the air duct after being subjected to heat exchange through the evaporator and further penetrates through the ventilation opening downwards, the water baffle is further arranged on the water pan, the ventilation opening is provided with a central axis, and the lower end of the water baffle is connected with the water pan. The upper end of the water baffle extends upwards and extends in the direction close to the central axis at the same time so as to extend to the position above the ventilation opening, and an inclined baffle is formed. According to the air conditioner indoor unit, the problem that part of condensate water at the bottom of the evaporator in the air conditioner indoor unit flows along with return air and splashes down into a lower air duct can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning technical field, concretely relates to a lower air supply air conditioning unit. BACKGROUND

[0002] With the large application of 4G and the gradual popularization of 5G, the heat generation of various data processing equipment is more and more large, and the data center is more and more high to the refrigerating capacity, energy saving, safety of air conditioning equipment, wherein the condensate water produced by the refrigerating unit is strictly prohibited to leak or enter the data machine room with return air.

[0003] The existing lower air supply refrigerating unit structure schematic diagram is as Figure 1As shown, the unit comprises an overall frame, a centrifugal fan and an evaporator arranged in the frame, wherein the evaporator is arranged at the upper part of the frame and the centrifugal fan is arranged at the bottom of the frame; the bottom end of the centrifugal fan component is fixed to the bottom plate of the frame of the refrigeration unit when the unit is shipped, and when the unit is installed on site, the fixing device is removed and the centrifugal fan component is moved downward into the overhead layer, and the upper end of the centrifugal fan component is fixed to the bottom plate of the frame again; when the centrifugal fan is running, the return air passes through the fin gap of the evaporator from the outside of the refrigeration unit, converges to the center and then flows downward through the bottom of the refrigeration unit into the centrifugal fan, and under the action of the centrifugal fan, the return air enters the overhead layer; the bottom of the evaporator is provided with a water pan, which is horizontally fixed on the overall frame as one of the support installation structures of the evaporator, receives the low-temperature condensed water generated by the evaporator during refrigeration, and is discharged through a drain pipe, the middle position of the water pan is hollow and has an inner frame arranged upward, the adjacent positions of the inner frames of each water pan are welded and sealed to prevent leakage of condensed water, and the hollow structure formed by the inner frame of the water pan serves as a flow hole for the return air to enter the lower part of the unit from the upper part of the unit; when the refrigeration unit is working, the return air passes through the evaporator under the suction action of the centrifugal fan, and after air heat exchange and refrigeration, the return air enters the centrifugal fan from top to bottom, and is sent into the overhead layer after being pressurized and accelerated by the centrifugal fan, the water vapor in the air is condensed on the evaporator, the condensed water flows into the water pan, and is discharged through the drain pipe on the water pan; the condensed water of the evaporator flows downward along the surface of the heat exchange fin under the action of gravity and converges into the water pan at the bottom of the evaporator, so the closer to the water pan, the more condensed water is collected, and even the fin gap in the bottom area of the evaporator is filled with condensed water, which makes it difficult for the return air to pass through the fin gap filled with condensed water, thereby affecting the heat exchange effect of this area; in addition, when the fin gap in the bottom area is filled with discontinuous condensed water, the flowable gap in the fin gap becomes smaller, thereby increasing the speed of the passing return air, and under the suction action of the centrifugal fan, the amount of return air near the bottom of the evaporator of the centrifugal fan is greater than that of the upper part of the evaporator, and these two factors superimposed may carry the condensed water between the fins at the bottom of the evaporator away from the fin surface, and part of the condensed water flows with the return air and splashes, which is more obvious in the high-temperature and humid return air and large cooling capacity and large air volume operating conditions.

[0004] The prior arts CN205048796U, CN204648520U and CN201335465Y all adopt the structure of splitting a large-height evaporator into multiple small-height evaporators and stacking them again to form an evaporator component, and a dedicated water pan is arranged at the bottom of each evaporator to receive the condensed water or defrosting water generated by the evaporator above the water pan, so as to block the condensed water or defrosting water from flowing to the lower evaporator, thereby reducing the water amount of the bottom evaporator. The evaporator component with this structure can solve the problem of return air carrying water to some extent.

[0005] In theory, the more the number of intermediate water collection trays, the lower the severity of the problems described above, and the better the heat exchange performance of the evaporator. However, in practice, due to the height of the water collection tray, the effective heat exchange area of the evaporator is reduced, and the flow area of the return air is also reduced, which causes the return air to flow faster through the evaporator, and the condensate water at the bottom of the evaporator is more likely to be carried away from the fin surface, thereby causing the return air to carry water and the condensate water to splash. In addition, it will also cause the structure of the evaporator to be more complex, and the cost of parts processing, production assembly, after-sales maintenance, etc. may be higher.

[0006] Therefore, there is an urgent need for a new technical solution to solve the problem of water carrying and condensate water splashing at the bottom of a high and large size evaporator.

[0007] Due to the technical problems of the existing lower air supply air conditioning unit, the condensate water at the bottom of the evaporator inside the indoor unit is easily carried away by the return air and splashed into the lower air duct, therefore, the utility model discloses a lower air supply air conditioning unit. Utility model content

[0008] Therefore, the utility model wants to solve the technical problem of overcoming the defects of the existing lower air supply air conditioning unit, such as the condensate water at the bottom of the evaporator inside the indoor unit being easily carried away by the return air and splashing into the lower air duct, so as to provide a lower air supply air conditioning unit.

[0009] In order to solve the above problems, the utility model provides a lower air supply air conditioning unit, which comprises:

[0010] The evaporator, the water collection tray and the water baffle, the water collection tray is located at the lower end of the evaporator, the evaporator is surrounded by an air duct in its interior, the air duct allows airflow to pass through, the water collection tray is provided with a ventilation opening below the air duct, so that the airflow around the evaporator enters the air duct after heat exchange through the evaporator, and further passes through the ventilation opening, the water baffle is also provided on the water collection tray, the ventilation opening has a central axis, the lower end of the water baffle is connected with the water collection tray, and the upper end of the water baffle extends upward and also extends towards the central axis, so as to extend above the ventilation opening and form an inclined baffle.

[0011] In some embodiments,

[0012] The upper end of the water baffle forms a wind passage, the wind passage below the water baffle is surrounded by the water baffle, the wind passage, the wind passage and the ventilation opening are sequentially communicated from top to bottom, and the upper end of the wind passage is communicated with the air duct;

[0013] The baffle plate can block the condensate at the bottom of the evaporator, while allowing at least part of the airflow passing through the bottom of the evaporator to be guided through the baffle plate to the air outlet and the air passage.

[0014] In some implementations...

[0015] Within the projection plane of the horizontal water-receiving surface of the water-receiving tray, the vent has a quadrilateral structure, including a first and second opposite side, and a third and fourth opposite side. The evaporator has a U-shaped structure, located on the outer periphery of the vent and opposite the first, second, and third sides respectively.

[0016] The water baffle includes a first baffle, a second baffle, and a third baffle. The first baffle is opposite to the first side, and the lower end of the first baffle is located on the outer periphery of the first side. The upper end of the first baffle extends above the vent. The second baffle is opposite to the second side, and the lower end of the second baffle is located on the outer periphery of the second side. The upper end of the second baffle extends above the vent. The third baffle is opposite to the third side, and the lower end of the third baffle is located on the outer periphery of the third side. The upper end of the third baffle extends above the vent.

[0017] In some implementations...

[0018] The baffle plate also includes a fourth baffle plate. The fourth side of the vent is opposite to the opening of the "U"-shaped structure. The fourth baffle plate is located on the outer periphery of the fourth side and is opposite to the third baffle plate. The first baffle plate, the third baffle plate, the second baffle plate and the fourth baffle plate are connected in sequence to form a U-shaped structure in the projection plane of the horizontal plane. The lower end of the fourth baffle plate is connected to the water receiving tray. The upper end of the fourth baffle plate extends vertically or extends upward in a direction away from the central axis of the vent.

[0019] In some implementations...

[0020] The vent has an inner frame extending upwards, and the lower end of the baffle plate is located on the side of the inner frame away from the vent and is fitted to the inner frame.

[0021] The inner frame includes a first inner frame protruding upward at the periphery of the first side, a second inner frame protruding upward at the periphery of the second side, a third inner frame protruding upward at the periphery of the third side, and a fourth inner frame protruding upward at the periphery of the fourth side, the lower end of the first baffle plate is arranged in abutment with the surface of the first inner frame facing away from the air vent, the lower end of the second baffle plate is arranged in abutment with the surface of the second inner frame facing away from the air vent, the lower end of the third baffle plate is arranged in abutment with the surface of the third inner frame facing away from the air vent, and the lower end of the fourth baffle plate is arranged in abutment with the surface of the fourth inner frame facing away from the air vent.

[0022] In some embodiments,

[0023] The upper surface of the water baffle is arranged at an angle between 0 and 90 degrees with respect to the horizontal plane, and the angle between the upper surface of the water baffle and the horizontal plane can also be adjusted.

[0024] In some embodiments,

[0025] When the water baffle includes a first baffle plate and a second baffle plate, an adjusting assembly is further arranged between the opposite first baffle plate and second baffle plate, which can adjust the distance between the first baffle plate and the second baffle plate to decrease or increase, so as to adjust the change of the angle between the upper surface of the first baffle plate and the horizontal plane, and adjust the change of the angle between the upper surface of the second baffle plate and the horizontal plane.

[0026] In some embodiments,

[0027] When the water baffle further includes a third baffle plate and a fourth baffle plate, the first baffle plate and the second baffle plate are made of hard material, the third baffle plate is made of soft material, and the hardness of the hard material is greater than the hardness of the soft material.

[0028] In some embodiments,

[0029] The adjusting assembly includes a motor, a fixed rod, a drive shaft and a bearing, one end of the fixed rod is connected to the first baffle plate, one end of the drive shaft is connected to the second baffle plate through the bearing, the other end of the fixed rod is opposite to the other end of the drive shaft and forms a threaded connection, and the motor is connected to the drive shaft to drive the drive shaft to rotate, so that the distance between one end of the fixed rod and one end of the drive shaft increases or shortens.

[0030] In some embodiments,

[0031] The other end of the fixed rod is internally provided with an internally threaded hole, the other end of the driving shaft is externally provided with an externally threaded hole, the externally threaded hole is threadedly connected with the internally threaded hole, a sliding groove is formed in the outer circumferential surface of the driving shaft and is parallel to the central axis of the driving shaft, the motor comprises a driving wheel, the driving wheel is sleeved on the outer circumferential surface of the driving shaft, and the inner circumferential surface of the driving wheel is further provided with a convex strip, the convex strip is clamped in the sliding groove and can slide along the sliding groove, and the driving wheel can drive the driving shaft to rotate.

[0032] In some embodiments,

[0033] The heating assembly is further arranged in the air passage and / or the inner frame.

[0034] In some embodiments,

[0035] The heating assembly is fixed to the wall surface of the water baffle facing the air vent, and / or the heating assembly is fixed to the inner wall of the inner frame.

[0036] The heating assembly is arranged in at least one row in the vertical direction, and when there are at least two rows, the at least two rows of heating assemblies are arranged in a longitudinal and transverse staggered form in the vertical direction.

[0037] In some embodiments,

[0038] A fan is arranged below the water pan, the air inlet of the fan is opposite to the air vent, and the air outlet of the fan faces the indoor room.

[0039] The lower air supply air conditioning unit has the following beneficial effects:

[0040] 1. The water baffle is arranged on the water pan, the lower end of the water baffle is connected with the water pan, the upper end of the water baffle extends upward and also extends towards the direction close to the central axis of the air vent, so as to extend above the air vent and form an inclined baffle, which can prevent water from entering the air vent, especially from the bottom evaporator (especially horizontally), and guide the condensed water to flow into the water pans on both sides, reduce the return air intensity of the bottom part of the evaporator, and intercept the splashed water droplets by using the inclined baffle; the upper and lower end faces of the surrounding platform surrounded by the inclined water baffles are through flow holes for return air, the water droplets carried by the air outlet of the bottom part of the evaporator can be intercepted by the water baffle, the water droplets are prevented from splashing on the bottom air duct, and the safety threat to the bottom fan is avoided; the condensed water intercepted by the inclined baffle can flow downward along the baffle wall and return to the water pan at the bottom part of the evaporator, effectively solving the problem that the condensed water at the bottom part of the evaporator in the indoor unit of the lower air supply air conditioner flows with the return air and splashes into the air duct below.

[0041] 2. The utility model also through setting up the water baffle to its inclination angle can be adjusted structure form, can change the water baffle's inclination angle and effective water retaining height, in order to satisfy the operation condition of different air quantity, preferably through the opposite group water baffle adopts the hard impermeable material, in addition opposite group water baffle adopts the soft impermeable material, the hard board is connected with the adjusting assembly between, change the length on the adjusting assembly through the drive motor fixed on the adjusting assembly, and then change the relative distance of hard board, thereby change the water baffle's inclination angle and effective water retaining height, in order to satisfy the operation condition of different air quantity, the utility model discloses still through setting up heating assembly, can make the cold wind after evaporator refrigeration, after the water retaining of water baffle, after heating assembly can be heated, can guarantee the temperature range required in the room, and can guarantee constant temperature and humidity, improve the comfort of user. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is the longitudinal section view (front view) of prior art's lower air supply air conditioning unit;

[0043] Figure 2 It is Figure 1 The top view structure diagram of;

[0044] Figure 3 Figure 1 The local enlarged view of M part of;

[0045] Figure 4 It is the longitudinal section view (front view) of the utility model's lower air supply air conditioning unit;

[0046] Figure 5 It is Figure 4 The top view structure diagram of;

[0047] Figure 6 Figure 4 The local enlarged view of N part of;

[0048] Figure 7 Figure 6 The A direction brief view of;

[0049] Figure 8 It is Figure 5 The enlarged structure diagram of adjusting assembly in.

[0050] The figure mark shows as:

[0051] 1, evaporator; 2, water pan; 3, water baffle; 31, first baffle; 32, second baffle; 33, third baffle; 34, fourth baffle; 4, air duct; 5, ventilation opening; 6, air passage; 7, air passage channel; 8, inner frame; 9, adjusting assembly; 91, motor; 92, fixed rod; 93, drive shaft; 94, bearing; 10, heating assembly; 11, fan; 12, overhead plate; 13, overhead layer; 14, base floor; 100, refrigeration unit. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0053] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0054] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the various embodiments described herein are not meant to limit the scope of the present application. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion. The techniques, methods and devices known to those skilled in the art can not be discussed in detail, but in appropriate cases, the techniques, methods and devices should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0055] In the description of the utility model, it needs to be understood that the orientation words such as '' front, back, up, down, left, right'', '' horizontal, vertical, perpendicular, horizontal'' and '' top, bottom '' and the like indicated orientation or positional relationship is usually based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, in the absence of the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation of the protection scope of the utility model;The orientation words '' inside, outside '' refer to the inside and outside relative to the contour of each component.

[0056] For the convenience of description, spatial relative terms such as '' above'', '' above'', '' upper surface'', '' upper '' and the like can be used here to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawing. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawing. For example, if the device in the drawing is inverted, the device described as '' above '' or '' above '' other devices or structures will be positioned '' below '' or '' below '' other devices or structures. Thus, the exemplary term '' above '' can include both '' above '' and '' below ''. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used here is interpreted accordingly.

[0057] In addition, it needs to be explained that the use of '' first'', '' second '' and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore, it cannot be understood as the limitation of the protection scope of the utility model.

[0058] As Figures 4-8 As shown in the utility model provides a kind of lower air supply air conditioning unit (preferably lower air supply machine room air conditioning indoor unit), it includes:

[0059] The evaporator 1, the water pan 2 located at the lower end of the evaporator 1, the air duct 4 formed in the inside of the evaporator 1 and allowing airflow to flow through, the air vent 5 provided on the water pan 2 below the air duct 4, so that the airflow around the evaporator 1 enters the air duct 4 after heat exchange with the evaporator 1, further passes through the air vent 5 downward, the water baffle 3 further provided on the water pan 2, the air vent 5 has a central axis, the lower end of the water baffle 3 is connected with the water pan 2, the upper end of the water baffle 3 extends upward and also extends towards the central axis, so as to extend above the air vent 5 (preferably vertically above the air vent 5), forming an inclined baffle.

[0060] The water baffle 3 is connected with the water pan 2 at the lower end, and the upper end of the water baffle 3 extends upward and also extends towards the central axis of the air vent 5, so as to extend above the air vent 5, forming an inclined baffle, which can prevent the water carried by the airflow from the bottom evaporator (especially transversely) from entering the air vent 5, and guide the condensed water to flow into the water pans on both sides, reduce the return air intensity of the bottom evaporator, and intercept the splashed water droplets by the inclined baffle; the upper and lower end faces of the surrounding platform surrounded by the inclined water baffles around are through flow holes for return air flow, which can intercept the water droplets carried by the airflow from the bottom evaporator by the water baffle, prevent the water droplets from splashing on the air duct at the bottom, and avoid the safety threat to the bottom fan; the condensed water intercepted by the inclined baffle can flow downward along the baffle wall and return to the water pan at the bottom of the evaporator, effectively solving the problem that the condensed water at the bottom of the evaporator in the indoor unit of the downflow air conditioner flows with the return air and splashes into the air duct below.

[0061] In some embodiments,

[0062] The upper end of the water baffle 3 forms a wind passage 6 for accommodating airflow, the wind passage 6 below is a wind passage 7 surrounded by the water baffle 3, the wind passage 6, the wind passage 7 and the air vent 5 are sequentially communicated from top to bottom, and the upper portion of the wind passage 6 is communicated with the air duct 4;

[0063] The water baffle 3 can block the condensed water at the bottom of the evaporator 1, and also allow at least part of the airflow passing through the bottom of the evaporator 1 to be guided to the wind passage 6 and the wind passage 7 by the water baffle 3.

[0064] The utility model discloses a wind passage that is surrounded by the air passage of the upper end of the water baffle and the water baffle, so that the air passage is communicated with the air duct of the evaporator above the air passage, and the air passage is communicated with the wind passage below the air passage, so that the airflow passes through the evaporator and exchanges heat, the condensed water at the bottom of the water tray is effectively blocked by the water baffle, but the wind can flow upward to the air passage and the wind passage through the inclined baffle, compared with the vertical baffle, the utility model not only can block the condensed water from entering the air vent, but also can guide the cold air after heat exchange to the air vent, can increase the export effect of cold air, improve the refrigeration efficiency and refrigeration performance of air conditioner.

[0065] In some embodiments,

[0066] In the projection plane of the horizontal water receiving surface of the water receiving tray 2, the air vent 5 is a quadrilateral port structure (preferably rectangular), including opposite first and second edges, and opposite third and fourth edges, the evaporator 1 is a "U" shaped structure, the "U" shaped structure is located at the outer periphery of the air vent 5 and is opposite to the first edge, the second edge and the third edge respectively,

[0067] The water baffle 3 includes a first baffle 31, a second baffle 32 and a third baffle 33, the first baffle 31 is opposite to the first edge, and the lower end of the first baffle 31 is located at the outer periphery of the first edge, the upper end of the first baffle 31 extends to the upper side of the air vent 5 (preferably opposite to the air vent 5 in the vertical direction), the second baffle 32 is opposite to the second edge, and the lower end of the second baffle 32 is located at the outer periphery of the second edge, the upper end of the second baffle 32 extends to the upper side of the air vent 5 (preferably opposite to the air vent 5 in the vertical direction), the third baffle 33 is opposite to the third edge, and the lower end of the third baffle 33 is located at the outer periphery of the third edge, the upper end of the third baffle 33 extends to the upper side of the air vent 5 (preferably opposite to the air vent 5 in the vertical direction).

[0068] This is a further preferred structure of the evaporator and the water baffle of the utility model, the evaporator is preferably a "U" shaped structure, which can form 3 air inlets, and the heat exchange area is increased after heat exchange through the evaporator, and the water baffle is also a 3 -sided structure, that is, the first baffle is opposite to the first side section of the U-shaped structure, which can block the condensed water at the bottom generated by refrigeration, the second baffle is opposite to the second side section of the U-shaped structure, which can block the condensed water at the bottom generated by refrigeration of the second side section, and the third baffle is opposite to the third side section of the U-shaped structure, which can block the condensed water at the bottom generated by refrigeration of the third side section, the three baffles are all inclined to extend to the vertical upper side of the air vent, which can maximize the blocking effect of the condensed water generated by the three side section evaporators, preventing the condensed water from splashing into the air vent.

[0069] In some implementations...

[0070] The vent 5 has an inner frame 8 extending upwards along its edge, and the lower end of the baffle plate 3 is located on the side of the inner frame 8 away from the vent 5 and is fitted to the inner frame 8.

[0071] The inner frame 8 includes a first inner frame protruding upward from the outer periphery of the first side, a second inner frame protruding upward from the outer periphery of the second side, a third inner frame protruding upward from the outer periphery of the third side, and a fourth inner frame protruding upward from the outer periphery of the fourth side. The lower end of the first baffle 31 is fitted to the surface of the first inner frame facing away from the vent 5. The lower end of the second baffle 32 is fitted to the surface of the second inner frame facing away from the vent 5. The lower end of the third baffle 33 is fitted to the surface of the third inner frame facing away from the vent 5.

[0072] This utility model further incorporates an upward-protruding inner frame structure along the edge of the vent, which effectively blocks water from the water tray surrounding the vent. Simultaneously, the lower end of the baffle plate is fitted to the side of the inner frame away from the vent, further preventing condensate from the evaporator on the water tray from entering the vent, thus providing a waterproof seal. The inner frame includes four inner frames in four directions, effectively blocking water around the rectangular vent. Each inner frame is fitted to a corresponding baffle, providing water blocking in multiple directions, further enhancing the waterproof seal and preventing condensate from the bottom of the evaporator inside the downdraft air conditioner indoor unit from flowing with the return air and splashing into the lower duct.

[0073] Preferably, the baffle plate 3 further includes a fourth baffle plate 34, the fourth side of the vent 5 is opposite to the opening of the "U"-shaped structure, the fourth baffle plate 34 is located on the outer periphery of the fourth side and is opposite to the third baffle plate 33, the first baffle plate 31, the third baffle plate 33, the second baffle plate 32 and the fourth baffle plate 34 are connected in sequence to form a U-shaped structure in the projection plane of the horizontal plane, the lower end of the fourth baffle plate 34 is connected to the water receiving tray 2 and / or the fourth side, and the upper end of the fourth baffle plate 34 extends vertically or extends upward in a direction away from the central axis of the vent 5.

[0074] This invention also uses a fourth baffle to further block condensate in the water tray. The fourth baffle extends vertically or extends upwards away from the central axis of the vent, which can effectively increase the airflow area of ​​the vent, improve airflow, and enhance cooling and heat exchange efficiency.

[0075] This invention connects inclined baffles to the inner frame of the water receiving tray, which can reduce the return air intensity at the bottom of the evaporator while intercepting splashed water droplets. The upper and lower ends of the platform formed by the inclined baffles around the perimeter are through-flow holes for the return air to circulate (i.e., through the air inlet and air passage). The electric heating component can be fixed inside the platform formed by the baffles. The return air is heated by the electric heating component, and the splashed condensate can be prevented from posing a safety threat to the electric heating component.

[0076] Beneficial effects: The baffle plate intercepts water droplets carried by the air outlet at the bottom of the evaporator, preventing water droplets from splashing onto the air duct at the bottom and avoiding a safety threat to the fan at the bottom; the condensate intercepted by the inclined baffle plate can flow down along the baffle wall and return to the water collection tray at the bottom of the evaporator; the baffle plate can also serve as a fixed foundation for the electric heating components, making full use of the internal space of the enclosure and enhancing the heat treatment effect of the return air.

[0077] like Figure 1 and Figure 2 As shown, the existing downdraft chiller unit structure includes an overall frame, a centrifugal fan and an evaporator placed within the frame, with the evaporator located at the top of the frame and the centrifugal fan at the bottom. At the factory, the bottom of the centrifugal fan component is fixed to the chassis of the chiller unit frame. During on-site installation in the data center, the fixing device is removed, and the centrifugal fan component moves downwards into the overhead layer, and the top of the centrifugal fan component is fixed back to the chassis of the frame. When the centrifugal fan is running, return air passes through the fin gaps of the evaporator from the outer side of the chiller unit, converges at the center, flows downwards through the bottom of the chiller unit, and enters the centrifugal fan. Under the action of the centrifugal fan, the return air enters the overhead layer, then flows upwards through the air outlets of the overhead layer into the data center room, cooling the heat-generating equipment in the data center. The heated return air then passes through the evaporator fins again from the outer side of the chiller unit, forming a complete return air cycle.

[0078] The evaporator bottom is provided with a water pan, and the water pan has a certain height distance with the bottom plate of the overall frame. The space between the water pan and the bottom plate of the overall frame is mainly used to accommodate the centrifugal fan components when leaving the factory. The water pan is horizontally fixed on the overall frame as the support installation structure of the evaporator. The water pan receives the low-temperature condensed water generated during the refrigeration of the evaporator and removes it through the drain pipe. The middle position of the water pan is hollow and has an inner frame arranged upward. The adjacent positions of the inner frames of each water pan are welded and sealed to prevent the condensed water from leaking downward from the middle flow hole to the centrifugal fan components below. The hollow structure formed by the inner frame of the water pan serves as a return air flow hole, allowing return air to enter the lower part of the unit from the upper part of the unit. When the refrigeration unit is working, the return air passes through the gap between the fins of the evaporator under the suction of the centrifugal fan, and after heat exchange and refrigeration, the air enters the centrifugal fan from top to bottom. The water vapor in the return air condenses into water droplets on the evaporator, and the condensed water flows downward to the water pan and is discharged through the drain pipe on the water pan. The condensed water of the evaporator flows downward along the surface of the heat exchange fin under the action of gravity and converges to the water pan at the bottom of the evaporator. Therefore, the more condensed water is collected in the evaporator heat exchange area that is closer to the bottom water pan, and even in the fin gap of the evaporator bottom heat exchange area, which is filled with condensed water, making it difficult for return air to pass through these condensed water-filled fin gaps, thereby affecting the heat exchange effect of this area. In addition, when the bottom area fin gap is filled with discontinuous condensed water, the flowable gap in the fin gap becomes smaller, thereby increasing the speed of the passing return air. At the same time, under the suction of the centrifugal fan, the return air volume near the bottom of the evaporator of the centrifugal fan is greater than that at the top of the evaporator. These two factors superimpose and may carry the condensed water in the fin gap at the bottom of the evaporator away from the fin surface. Part of the condensed water flows with the return air and splashes. This situation is more obvious in high-temperature and humid return air and large cooling capacity and large air volume operating conditions (see Figure 3 and Figure 7 ). This return air with water situation is more obvious in high-temperature and humid return air and large cooling capacity and large air volume operating conditions: the dew point temperature of high-temperature and humid return air is relatively high, and the return air is easy to condense water droplets on the evaporator; the evaporating temperature is usually low when the refrigeration unit outputs large cooling capacity, which makes the return air more prone to condensation; under large air volume conditions, the face velocity of the evaporator is larger, and the air velocity in the fin gap is also larger, so it is easier to blow away the condensed water droplets on the fin surface, thereby making it easier to occur the return air with water phenomenon.

[0079] The space between the water pan and the bottom plate of the refrigeration unit is used to accommodate the fixed centrifugal fan components when leaving the factory. The drawings provided by the technical solution are schematic diagrams and not complete and true refrigeration unit product design drawings, which are used to understand the technical solution.

[0080] As Figure 4 and Figure 5As shown, the utility model discloses the improvement design to above refrigerating unit, the inner frame of water pan of original machine set is increased and is connected with front baffle (fourth baffle 34), rear baffle (third baffle 33), left baffle (first baffle 31) and right baffle (second baffle 32) on, can understand if the inner frame of water pan of original machine set is triangle and only has 3 inner frames, then the utility model correspondingly uses 3 newly added baffle and cooperates with it, the rest is by analogy.

[0081] Preferably, the front, rear, left and right baffles are inclined upward, and the connection between them and the connection between each baffle and the inner frame of the water pan are sealed (such as by welding, or by integral molding technology, or by soft adhesive tape, or a combination of these measures, etc.), to prevent condensate water from falling down to the bottom of the centrifugal fan component from the connecting gap.

[0082] Preferably, the top end of each inclined baffle is at the same height, and a flow-through hole (i.e., air passage 6) is formed at the top end, so that return air passes through the flow-through hole from the upper part of the refrigerating unit to the lower part of the refrigerating unit.

[0083] Further, the front baffle is preferably located in the opening area of the evaporator (the utility model preferably uses a U-shaped evaporator, and the "opening" is the opening of the U-shaped evaporator without heat exchange area, and the U-shaped evaporator is the most commonly used structure type for the lower air blower unit, which can greatly increase the heat exchange area of the evaporator and reduce the overall structure size of the refrigerating unit, making the refrigerating unit more compact; the actual refrigerating unit uses a sealing plate to close the opening area of the U-shaped evaporator and the top area of the evaporator, and the sealing plate is not shown in the drawings of the utility model), and the front baffle is vertically arranged, because there is no return air flow through the opening of the U-shaped evaporator, the front baffle does not need to block the condensate water, so the front baffle is vertically arranged or inclined away from the middle opening direction, which can increase the return air flow area of the middle opening (as can be seen from the vertical arrangement of the front baffle). Figure 5

[0084] In some embodiments,

[0085] The upper surface of the water baffle 3 is inclined between the horizontal plane, and the included angle between the upper surface of the water baffle 3 and the horizontal plane is (0, 90°), and the included angle between the upper surface of the water baffle 3 and the horizontal plane can also be adjusted.

[0086] The utility model also sets the water baffle to the structure form that the inclined angle thereof can be adjusted, which can change the inclined angle and effective water blocking height of the water baffle, so as to meet the operation conditions of different air volumes.

[0087] In some embodiments,

[0088] ​When the water baffle 3 comprises the first baffle 31 and the second baffle 32, an adjusting assembly 9 is further arranged between the opposite first baffle 31 and the second baffle 32, and the adjusting assembly 9 can adjust the distance between the first baffle 31 and the second baffle 32 to reduce or increase, so as to adjust the change of the inclined angle between the upper surface of the first baffle 31 and the horizontal plane, and adjust the change of the inclined angle between the upper surface of the second baffle 32 and the horizontal plane.

[0089] The adjusting assembly is arranged between the opposite first and second baffles, the distance between the first and second baffles can be adjusted to reduce or increase, so that the inclined angle of the first baffle changes, and the inclined angle of the second baffle changes, so that the inclined angle changes according to different air volume regulators, preferably, the length of the adjusting assembly is increased when the air volume is large, the inclined angle of the baffle is increased, the effect of intercepting condensate water droplets can be enhanced, and when the air volume is small, the inclined angle is reduced, the airflow at the bottom can enter the ventilation opening as much as possible, and the refrigeration performance is improved.

[0090] In some embodiments,

[0091] The first baffle 31 and the second baffle 32 are made of hard material, and the third baffle 33 and the fourth baffle 34 are made of soft material, and the hardness of the hard material is greater than the hardness of the soft material.

[0092] The utility model discloses preferably through with opposite a group of water baffle adopts hard impermeable material, in addition opposite a group of water baffle adopts soft impermeable material, when the length of adjusting assembly is changed through the drive motor fixed on the adjusting assembly, and the relative distance of hard plate is changed, the third and fourth baffles connected between the first and second baffles preferably select flexible material, can deform, thereby with the change of the inclined angle of the first and second baffles, so that the inclined angle of the water baffle and the effective water retaining height are changed, so as to meet the operation condition of different air volume.

[0093] The utility model discloses provide on the inside frame of water pan connection inclined baffle, reduce the air return intensity of evaporimeter bottom most while using the baffle to intercept the water drop that splashes, the surrounding water baffle is surrounded and is the through passageway for the circulation of air return of the upper and lower two end surfaces of the surrounding platform.

[0094] Preferably, opposite a group of water baffle adopts hard impermeable material, in addition opposite a group of water baffle adopts soft impermeable material, hard plate is connected with adjusting assembly, the length of adjusting assembly is changed through the drive motor fixed on the adjusting assembly, and the relative distance of hard plate is changed, so that the inclined angle of the water baffle and the effective water retaining height are changed, so as to meet the operation condition of different air volume.

[0095] The utility model discloses a relative one group of water baffle adopts hard impermeable material, and the other relative one group of water baffle adopts soft impermeable material Figure 5 The left baffle and the right baffle are hard plates, and the front baffle and the rear baffle are soft plates, the hard plate, the inner frame of the water pan and the soft plate (i.e. the connecting technology between the hard material and the soft material) adopt crimping, glue bonding, screw fixing, rivet fixing, line sewing or the combination of these connecting technologies to realize connection, and are sealed by waterproof sealant and the like, the hard plate and the inner frame of the water pan are connected by a hinge and are bonded by soft sealing tape to prevent condensate leakage, so that the inclination angle of the hard plate can be adjusted.

[0096] The utility model discloses that the two hard plates (left baffle and right baffle) are connected with the horizontally arranged adjusting assembly, the adjusting assembly can change the length of adjusting assembly through the drive motor of itself, thereby changing the distance between the top of two hard plates, and further changing the inclination angle of water baffle and the effective water retaining height, so as to satisfy different operating conditions, for example, increasing the length of adjusting assembly under the condition of large wind volume, so that the inclination angle of baffle is larger, and the interception of condensate is more effective (reference Figure 6 And Figure 7 The front baffle and the rear baffle of soft material change the morphology according to the flexible material characteristics.

[0097] In some embodiments,

[0098] The adjusting assembly 9 includes a motor 91, a fixed rod 92, a drive shaft 93 and a bearing 94, one end of the fixed rod 92 is connected to the first baffle 31, one end of the drive shaft 93 is connected to the second baffle 32 through the bearing 94, the other end of the fixed rod 92 is opposite to the other end of the drive shaft 93 and forms a threaded connection, the motor 91 is connected to the drive shaft 93 to drive the drive shaft 93 to rotate, so that the distance between one end of the fixed rod 92 and one end of the drive shaft 93 increases or shortens.

[0099] This is the preferred structure of the adjusting assembly of the utility model, through the structure of the fixed rod and the drive shaft, the first and second baffles can be connected respectively, and the drive shaft is driven to rotate by the motor, so that the relative linear motion occurs between the threaded fixed rod and the drive shaft, the relative moving away or the relative moving close are carried out, so that the effect of adjusting the distance between the first and second baffles is realized, and the effect that the inclination angle of the first and second baffles changes is achieved.

[0100] In some embodiments,

[0101] The other end of the fixed rod 92 is provided with an internally threaded hole towards the inside thereof, the other end of the driving shaft 93 is provided with an externally threaded hole on the outer periphery thereof, the externally threaded hole is threadedly engaged with the internally threaded hole, a sliding groove is formed on the outer peripheral surface of the driving shaft 93, the sliding groove is parallel to the central axis of the driving shaft 93, the motor 91 comprises a driving wheel, the driving wheel is sleeved on the outer periphery of the driving shaft 93, and the inner periphery of the driving wheel is further provided with a convex strip, the convex strip is clamped in the sliding groove and can slide along the sliding groove, and the driving wheel can drive the driving shaft 93 to rotate.

[0102] This is a further preferred cooperation mode of the fixed rod and the driving shaft of the utility model, that is, the threadedly engaged structure formed by the internally threaded hole of the fixed rod and the externally threaded hole of one end of the driving shaft, and the clamped cooperation between the sliding groove formed on the driving shaft and the convex strip on the driving wheel of the motor, so that the convex strip can slide along the sliding groove, so that the driving wheel and the driving shaft integrally rotate in the rotating direction, and the driving shaft is effectively driven to rotate.

[0103] The adjusting assembly of the utility model refers to Figure 8 As shown in the figure, the adjusting assembly is composed of a fixed rod, a driving shaft, a motor and a bearing, a threadedly engaged structure (for example, the driving shaft adopts an externally threaded structure, and the fixed rod adopts an internally threaded structure) is adopted between the driving shaft and the fixed rod, and the driving rod can realize the entering or exiting effect relative to the fixed rod when rotating, so as to change the length of the entire adjusting assembly.

[0104] A sliding groove is arranged on the surface of the driving shaft and is parallel to the central axis of the cylindrical driving shaft itself, a driving wheel of the motor is sleeved on the driving shaft, a convex strip is arranged on the inner hole surface of the driving wheel, the convex strip is embedded in the sliding groove and can realize free sliding, and the combination of the convex strip and the sliding groove guarantees that there is no relative rotating effect between the driving wheel and the driving shaft.

[0105] The motor is fixedly arranged at one end of the fixed rod close to the driving shaft, the driving wheel of the motor drives the driving shaft to rotate when rotating, a threadedly engaged structure is realized between the driving shaft and the fixed rod, so that the driving shaft realizes the entering or exiting effect relative to the fixed rod, and then the length of the entire adjusting assembly is changed.

[0106] The inner ring of the bearing is fixed to the end of the driving shaft away from the fixed rod, the outer ring of the bearing is fixed to the hard plate, and the end of the fixed rod away from the driving shaft is fixed to another hard plate.

[0107] In some embodiments,

[0108] A heating assembly 10 is further arranged in the air passing channel 7 and / or in the inner frame 8.

[0109] The utility model discloses still set up heating assembly, can make after the cold wind of evaporator refrigeration, after the water of baffle water, after heating assembly can be heated, can guarantee the temperature range required in the room, and can guarantee constant temperature and humidity, improve the comfort of user.

[0110] In some embodiments,

[0111] The heating assembly 10 is fixed to the wall surface of the water baffle 3 facing the air vent 5, and / or the heating assembly 10 is fixed to the inner wall of the inner frame 8; the heating assembly 10 is arranged in at least one row in the vertical direction, and when there are at least two rows, the at least two rows of heating assemblies 10 are arranged in a longitudinal and transverse staggered form in the vertical direction.

[0112] The heating assembly can be preferably fixed to the opposite side of the water baffle in the air supply channel, and can be preferably fixed to the inner frame of the air vent, and can be preferably fixed to the opposite inner side of the inner frame; further preferably, the heating assembly is arranged in a longitudinal and transverse staggered multi-row structure in the vertical direction, which can increase the contact area with the airflow and improve the heat exchange performance and efficiency.

[0113] The electric heating assembly is preferably arranged inside the surrounding platform formed by the water baffle and fixed to the inner side frame of the water pan, and the return air is heated by the electric heating assembly; the upper and lower two groups of electric heating assemblies can be arranged at different heights and form a longitudinal and transverse staggered arrangement form in the horizontal projection.

[0114] The lower air supply refrigeration unit preferably further comprises an electric heating assembly, and the electric heating assembly is composed of a plurality of electric heating parts; the electric heating assembly is a PTC electric heating.

[0115] Further preferably, the electric heating assembly is horizontally arranged, and both ends are fixed to the inner frame of the water pan and / or the bottom of the water pan; the heating component of the electric heating assembly spans the horizontal projection of the flow hole.

[0116] Further preferably, the electric heating assembly is horizontally arranged, and both ends are fixed to the inner frame of the water pan connected by the left baffle and the right baffle.

[0117] Further preferably, the other group of electric heating assemblies is horizontally arranged Figure 5 (not shown in the figure), and both ends are fixed to the inner frame of the water pan connected by the front baffle and the rear baffle, and the arrangement height of this group of electric heating assemblies and the other group of electric heating assemblies is different, and the two groups of electric heating assemblies form a longitudinal and transverse staggered arrangement form in the horizontal projection.

[0118] The return air from the flow-through hole (air outlet 6) is heated by the electric heating component and then enters the centrifugal fan to realize acceleration and pressurization.

[0119] In some embodiments,

[0120] A fan 11 is arranged below the water collecting tray 2, an air inlet of the fan 11 is opposite to the air vent 5, and an air outlet of the fan 11 faces the indoor room.

[0121] The utility model discloses further through the fan that sets up below the water collecting tray, makes its air inlet opposite and intercommunication with the air vent, can carry out the air draft to the airflow after the heat exchange of evaporator, and the airflow after the suction of fan blows to the indoor room through the air outlet, to guarantee the refrigeration and heating effect to the indoor room.

[0122] The above only is the preferred embodiment of the utility model, and does not use to limit the utility model, and any modification, equivalent replacement and improvement etc. that are made in the spirit and principle of the utility model should be included in the protection scope of the utility model. The above only is the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled person in the art, on the premise of not departing from the technical principle of the utility model, can make a number of improvements and variations, and these improvements and variations also should be regarded as the protection scope of the utility model.

Claims

1. A down-blowing air conditioning unit characterized by: The air conditioner comprises an evaporator (1), a water pan (2) and a baffle (3), the water pan (2) is arranged at the lower end of the evaporator (1), the evaporator (1) is internally surrounded by an air duct (4) allowing airflow to flow through, the water pan (2) is provided with a ventilation opening (5) below the air duct (4), so that the airflow around the evaporator (1) enters the air duct (4) after heat exchange with the evaporator (1), and further passes through the ventilation opening (5) downwardly, the baffle (3) is further arranged on the water pan (2), the ventilation opening (5) has a central axis, the lower end of the baffle (3) is connected to the water pan (2), and the upper end of the baffle (3) extends upwardly and also extends towards the central axis, so as to extend above the ventilation opening (5) and form an inclined baffle.

2. The air conditioner according to claim 1, wherein: the upper end of the baffle (3) forms an air passing opening (6) for accommodating air passing, the air passing opening (6) is below an air passing channel (7) surrounded by the baffle (3), the air passing opening (6), the air passing channel (7) and the ventilation opening (5) are sequentially communicated from top to bottom, and the air passing opening (6) is communicated with the air duct (4) above; the baffle (3) can block the condensed water at the bottom of the evaporator (1), and can also allow at least part of the airflow passing through the bottom of the evaporator (1) to be guided to the air passing opening (6) and the air passing channel (7) through the baffle (3).

3. The air conditioner according to claim 2, wherein: in the projection plane of the horizontal water surface of the water pan (2), the ventilation opening (5) is a quadrilateral opening structure, including opposite first and second edges and opposite third and fourth edges, the evaporator (1) is a "U" shaped structure, and the "U" shaped structure is located around the ventilation opening (5) and opposite to the first edge, the second edge and the third edge respectively; the baffle (3) comprises a first baffle (31), a second baffle (32) and a third baffle (33), the first baffle (31) is opposite to the first edge, and the lower end of the first baffle (31) is located around the first edge, the upper end of the first baffle (31) extends above the ventilation opening (5), the second baffle (32) is opposite to the second edge, and the lower end of the second baffle (32) is located around the second edge, the upper end of the second baffle (32) extends above the ventilation opening (5), the third baffle (33) is opposite to the third edge, and the lower end of the third baffle (33) is located around the third edge, and the upper end of the third baffle (33) extends above the ventilation opening (5).

4. The air conditioner according to claim 3, wherein: ​ The baffle plate (3) also includes a fourth baffle plate (34). The fourth side of the vent (5) is opposite to the opening of the "U"-shaped structure. The fourth baffle plate (34) is located on the outer periphery of the fourth side and is opposite to the third baffle plate (33). The first baffle plate (31), the third baffle plate (33), the second baffle plate (32) and the fourth baffle plate (34) are connected in sequence to form a U-shaped structure in the projection plane of the horizontal plane. The lower end of the fourth baffle plate (34) is connected to the water receiving tray (2) and / or the fourth side. The upper end of the fourth baffle plate (34) extends in the vertical direction or the upper end of the fourth baffle plate extends upward in a direction away from the central axis of the vent (5).

5. The downdraft air conditioning unit according to claim 4, characterized in that: The vent (5) has an inner frame (8) extending upwards along its edge. The lower end of the baffle (3) is located on the side of the inner frame (8) away from the vent (5) and is fitted to the inner frame (8). The inner frame (8) includes a first inner frame that protrudes upward from the outer periphery of the first side, a second inner frame that protrudes upward from the outer periphery of the second side, a third inner frame that protrudes upward from the outer periphery of the third side, and a fourth inner frame that protrudes upward from the outer periphery of the fourth side. The lower end of the first baffle (31) is fitted with the surface of the first inner frame that is away from the vent (5). The lower end of the second baffle (32) is fitted with the surface of the second inner frame that is away from the vent (5). The lower end of the third baffle (33) is fitted with the surface of the third inner frame that is away from the vent (5). The lower end of the fourth baffle (34) is fitted with the surface of the fourth inner frame that is away from the vent (5).

6. The downdraft air conditioning unit according to any one of claims 1-5, characterized in that: The upper surface of the baffle plate (3) is inclined to the horizontal plane, and the two are sandwiched at an angle between (0, 90°). The angle between the upper surface of the baffle plate (3) and the horizontal plane can also be adjusted.

7. The downdraft air conditioning unit according to claim 6, characterized in that: When the baffle plate (3) includes a first baffle (31) and a second baffle (32), an adjustment component (9) is also provided between the opposing first baffle (31) and second baffle (32). The adjustment component (9) can adjust the distance between the first baffle (31) and the second baffle (32) to decrease or increase, so as to adjust the change of the tilt angle between the upper surface of the first baffle (31) and the horizontal plane, and to adjust the change of the tilt angle between the upper surface of the second baffle (32) and the horizontal plane.

8. The downdraft air conditioning unit according to claim 7, characterized in that: When the water baffle (3) further comprises a third baffle (33) and a fourth baffle (34), the first baffle (31) and the second baffle (32) are made of hard material, the third baffle (33) and the fourth baffle (34) are made of soft material, and the hardness of the hard material is greater than the hardness of the soft material.

9. The under-sending air conditioning unit according to claim 7, wherein: The adjusting assembly (9) comprises a motor (91), a fixed rod (92), a driving shaft (93) and a bearing (94), one end of the fixed rod (92) is connected to the first baffle (31), one end of the driving shaft (93) is connected to the second baffle (32) through the bearing (94), the other end of the fixed rod (92) is opposite to the other end of the driving shaft (93) and is threadedly connected, and the motor (91) is connected to the driving shaft (93) to drive the driving shaft (93) to rotate, so that the distance between one end of the fixed rod (92) and one end of the driving shaft (93) is increased or shortened.

10. The under-sending air conditioning unit according to claim 9, wherein: The other end of the fixed rod (92) is internally provided with an internally threaded hole, the other end of the driving shaft (93) is externally provided with an externally threaded hole, the externally threaded hole is threadedly connected to the internally threaded hole, a sliding groove is formed on the outer circumferential surface of the driving shaft (93) and is parallel to the central axis of the driving shaft (93), the motor (91) comprises a driving wheel, the driving wheel is sleeved on the outer circumferential surface of the driving shaft (93), and the inner circumferential surface of the driving wheel is further provided with a protruding strip, the protruding strip is clamped in the sliding groove and can slide along the sliding groove, and the driving wheel can drive the driving shaft (93) to rotate.

11. The under-sending air conditioning unit according to claim 5, wherein: The air passing channel (7) and / or the inner frame (8) is further provided with a heating assembly (10).

12. The under-sending air conditioning unit according to claim 11, wherein: The heating assembly (10) is fixed to the wall surface of the water baffle (3) facing the air vent (5), and / or the heating assembly (10) is fixed to the inner wall of the inner frame (8); The heating assembly (10) is arranged in at least one row in the vertical direction, and when there are at least two rows, the at least two rows of heating assemblies (10) are arranged in a longitudinal and transverse staggered form in the vertical direction.

13. The under-sending air conditioning unit according to claim 1, wherein: A fan (11) is arranged below the water pan (2), the air inlet of the fan (11) is opposite to the air vent (5), and the air outlet of the fan (11) faces the indoor.

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