Lower air supply air conditioning unit

Abstract

The lower air supply air conditioning unit comprises an evaporator, a water receiving disc and a water baffle, the water receiving disc is located at the lower end of the evaporator, an air channel allowing airflow to flow through is defined in the evaporator, and a ventilation opening is formed in the position, below the air channel, of the water receiving disc. 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 lower air supply 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 present invention relates to the technical field of air conditioning, and in particular to a downflow air conditioning unit. Background Art

[0002] With the extensive application of 4G and the gradual popularization of 5G, the heat generated by various data processing equipment is getting higher and higher, and data centers have higher and higher requirements for the cooling capacity, energy saving, and safety of air-conditioning equipment. Among them, it is required that the condensed water generated by the refrigeration unit is strictly prohibited from leaking or entering the data room with the return air.

[0003] The schematic diagram of the existing down-flow refrigeration unit is as follows: Figure 1As shown, it includes an overall frame, a centrifugal fan and an evaporator placed in the frame, wherein the evaporator is placed on the upper part of the frame, and the centrifugal fan is placed at the bottom of the frame; the bottom end of the centrifugal fan component of the refrigeration unit is installed and fixed on the chassis of the frame of the refrigeration unit when the refrigeration unit leaves the factory, and the centrifugal fan component is moved downward into the overhead layer after the fixing device is removed during on-site installation in the data center, and the upper end of the centrifugal fan component is fixed on the chassis of the frame again; when the centrifugal fan is running, the return air passes through the fin gap of the evaporator from the outer side of the refrigeration unit, converges to the center, and then flows downward through the bottom of the refrigeration unit into the evaporator. The centrifugal fan is used to return air into the overhead layer under the action of the centrifugal fan; a water receiving pan is arranged at the bottom of the evaporator, and the water receiving pan is horizontally fixed on the overall frame as one of the supporting and mounting structures of the evaporator. The water receiving pan receives the low-temperature condensed water generated during the evaporator refrigeration and discharges it through the drain pipe. The middle position of the water receiving pan is hollow and has an inner frame arranged upward. The adjacent parts of the inner frames of each water receiving pan are welded and sealed to prevent the leakage of condensed water. The hollow through structure formed by the inner frame of the water receiving pan serves as the circulation hole for the return air, allowing the return air to enter the lower position of the unit from the upper part of the unit; when the refrigeration unit is working, the return air is in The air passes through the evaporator under the suction action of the centrifugal fan. After heat exchange and cooling, it enters the centrifugal fan from top to bottom, is pressurized and accelerated by the centrifugal fan, and is sent to the overhead layer. The water vapor in the air condenses on the evaporator, and the condensed water flows into the water receiving tray and is discharged through the drain pipe on the water receiving tray. The condensed water in the evaporator flows downward along the surface of the heat exchange fins under the action of gravity and gathers in the water receiving tray at the bottom of the evaporator. Therefore, the closer to the water receiving tray, the more condensed water is gathered. Even the fin gaps in the bottom area of ​​the evaporator are filled with condensed water, making it difficult for the return air to pass through these fin gaps filled with condensed water. Thereby affecting the heat exchange effect of this area; another possible situation is that when the fin spacing in the bottom area is filled with discontinuous condensed water, the gap that can flow within the fin spacing becomes smaller, thereby increasing the return air speed. At the same time, under the suction action of the centrifugal fan, the return air volume at the bottom of the evaporator close to the centrifugal fan is larger than the return air volume at the top of the evaporator. The combination of these two factors 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 and splashes with the return air. This situation is more obvious under high temperature and humid return air and large cooling and large air volume operating conditions.

[0004] The prior arts CN205048796U, CN204648520U and CN201335465Y all adopt the method of splitting a large-height evaporator into multiple small-height evaporators and stacking them again to form an evaporator component. A dedicated water receiving tray is arranged at the bottom of each evaporator to receive the condensed water or defrost water generated by the evaporator above the water receiving tray, blocking the condensed water or defrost water from flowing to the evaporator below, thereby reducing the water volume of the bottom evaporator. The evaporator component adopting this structure can solve the above-mentioned problem of return air carrying water to a certain extent.

[0005] Theoretically, as the number of intermediate water trays increases, the severity of the above-mentioned problems will decrease, and the heat exchange performance of the evaporator will be better. However, in reality, since the water tray needs to occupy a certain height, it will reduce the effective heat exchange area of ​​the evaporator and the circulation area of ​​the return air, resulting in a higher return air velocity through the evaporator, and it is also easier to carry the condensed water at the bottom of the evaporator away from the fin surface, thus forming a phenomenon of return air carrying water and condensed water splashing. Another aspect is that it will make the evaporator component structure more complex, and the cost of component processing, production assembly, and after-sales maintenance may be higher.

[0006] Therefore, new technical solutions are urgently needed to solve the problem of water in the bottom air outlet and condensed water splashing of tall and large evaporators.

[0007] Since the down-flow air-conditioning unit in the prior art has technical problems such as condensed water in the bottom part of the evaporator arranged at the upper position inside the indoor unit is easily flowed with the return air and splashed into the air duct below, the present invention studies and designs a down-flow air-conditioning unit. Summary of the invention

[0008] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that condensed water in the bottom part of the evaporator arranged at an upper position inside the indoor unit of the down-flow air-conditioning unit is easily flowed with the return air and splashed into the air duct below, thereby providing a down-flow air-conditioning unit.

[0009] In order to solve the above problems, the present invention provides a downflow air conditioning unit, which comprises:

[0010] An evaporator, a water collecting pan and a water baffle, wherein the water collecting pan is located at the lower end of the evaporator, and the evaporator forms an air duct inside the evaporator to allow air to flow through. A vent is provided on the water collecting pan below the air duct, so that the airflow at the periphery of the evaporator enters the air duct after heat exchange through the evaporator, and further passes downward through the vent. The water baffle is also provided on the water collecting pan, and the vent has a central axis. The lower end of the water baffle is connected to the water collecting pan, and the upper end of the water baffle extends upward and also in a direction close to the central axis to extend to the top of the vent to form an inclined baffle.

[0011] In some embodiments,

[0012] The upper end of the water baffle forms an air outlet for accommodating passing wind, and below the air outlet is an air passage surrounded by the water baffle. The air outlet, the air passage and the vent are connected in sequence from top to bottom, and the air outlet is connected to the air duct above.

[0013] The water baffle can block the condensed water at the bottom of the evaporator, and at the same time allow at least part of the airflow passing through the bottom of the evaporator to pass through the water baffle and be guided to the air outlet and the air passage.

[0014] In some embodiments,

[0015] In the projection plane of the horizontal water receiving surface of the water receiving tray, the vent is a quadrilateral opening structure, including a first side and a second side opposite to each other, and a third side and a fourth side opposite to each other. The evaporator is a "U"-shaped structure, and the "U"-shaped structure is located at the periphery of the vent and is opposite to the first side, the second side and the third side, 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 at the periphery of the first side, the upper end of the first baffle extends to the top of the vent, the second baffle is opposite to the second side, and the lower end of the second baffle is located at the periphery of the second side, the upper end of the second baffle extends to the top of the vent, the third baffle is opposite to the third side, and the lower end of the third baffle is located at the periphery of the third side, and the upper end of the third baffle extends to the top of the vent.

[0017] In some embodiments,

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

[0019] In some embodiments,

[0020] An inner frame is arranged upwardly at the edge of the vent, and the lower end of the water retaining plate is arranged on a side of the inner frame away from the vent and is closely attached to the inner frame;

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

[0022] In some embodiments,

[0023] The upper surface of the water baffle is inclined to the horizontal plane, and the two are arranged at an angle between (0, 90 degrees). The inclined 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 and a second baffle, an adjustment component is also arranged between the first baffle and the second baffle relative to each other, and the adjustment component can adjust the distance between the first baffle and the second baffle to reduce or increase, so as to adjust the change of the inclination angle between the upper surface of the first baffle and the horizontal plane, and adjust the change of the inclination angle between the upper surface of the second baffle and the horizontal plane.

[0026] In some embodiments,

[0027] When the water baffle further includes a third baffle and a fourth baffle, the first baffle and the second baffle are both made of hard material, the third baffle 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 adjustment 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, one end of the drive shaft is connected to the second baffle 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, 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 decreases.

[0030] In some embodiments,

[0031] The other end of the fixing rod is provided with an internal threaded hole toward the inside thereof, and the other end of the driving shaft is provided with an external thread on the outer periphery, and the external thread forms a threaded fit with the internal threaded hole. A sliding groove is provided on the outer peripheral surface of the driving shaft, and the sliding groove is parallel to the central axis of the driving shaft. The motor includes a driving wheel, and the driving wheel is sleeved on the outer periphery of the driving shaft, and a convex strip is further provided on the inner periphery of the driving wheel, and the convex strip is clamped in the sliding groove so as to be able to slide along the sliding groove, and the driving wheel can drive the driving shaft to rotate.

[0032] In some embodiments,

[0033] A heating component is also provided in the air passage and / or the inner frame.

[0034] In some embodiments,

[0035] The heating component is fixed on the wall surface of the water baffle plate facing the vent, and / or the heating component is fixed on the inner wall of the inner frame;

[0036] The heating components are arranged in at least one row in the vertical direction. When there are at least two rows, the heating components in at least two rows are arranged in a crisscross pattern along the vertical direction.

[0037] In some embodiments,

[0038] A fan is arranged below the water receiving tray, an air inlet of the fan is opposite to the vent, and an air outlet of the fan faces indoors.

[0039] The downflow air conditioning unit provided by the present invention has the following beneficial effects:

[0040] The condensed water of the bottom part of the evaporator is prevented from flowing into the vent hole by the water baffle plate at the bottom of the evaporator, and the condensed water is guided to flow into the water baffle plate at both sides, thereby reducing the return air intensity at the bottom of the evaporator and intercepting the splashed water droplets by the water baffle plate; the upper and lower end surfaces of the surrounding platform surrounded by the inclined water baffle plates are through-flow holes for the circulation of return air, and the water baffle plate can be used to intercept the water droplets carried by the wind outlet at the bottom of the evaporator, so as to prevent the water droplets from splashing on the air duct at the bottom and avoid posing a safety threat to the fan at the bottom; the condensed water intercepted by the inclined baffle plate can flow downward along the baffle plate wall surface and return to the water receiving pan at the bottom of the evaporator, thereby effectively solving the problem that the condensed water at the bottom of the evaporator inside the indoor unit of the down-air-supply air conditioner flows with the return air and splashes into the air duct below.

[0041] 2. The present invention can also change the inclination angle and effective water retaining height of the water retaining plate to meet the operating conditions of different wind volumes by setting the water retaining plate to a structural form in which its inclination angle can be adjusted; preferably, one relative group of water retaining plates is made of hard waterproof material, and another relative group of water retaining plates is made of soft waterproof material, and an adjustment component is connected between the hard plates, and the length of the adjustment component is changed by a drive motor fixed on the adjustment component, thereby changing the relative distance of the hard plates, thereby changing the inclination angle and effective water retaining height of the water retaining plate to meet the operating conditions of different wind volumes; the present invention can also set a heating component, so that the cold air after refrigeration by the evaporator can be heated by the heating component after being blocked by the water retaining plate, thereby ensuring the required temperature range in the room, and ensuring constant temperature and humidity, thereby improving the comfort of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a longitudinal sectional view (front view) of a downflow air conditioning unit of the prior art;

[0043] Figure 2 yes Figure 1 A top view of the structure;

[0044] Figure 3 yes Figure 1 A partial enlarged view of the M part;

[0045] Figure 4 It is a longitudinal sectional view (front view) of the down-flow air-conditioning unit of the present invention;

[0046] Figure 5 yes Figure 4 A top view of the structure;

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

[0048] Figure 7 yes Figure 6 A simplified view of the

[0049] Figure 8 yes Figure 5 An enlarged structural diagram of the regulatory components in .

[0050] The reference numerals are:

[0051] 1. Evaporator; 2. Water tray; 3. Water baffle; 31. First baffle; 32. Second baffle; 33. Third baffle; 34. Fourth baffle; 4. Air duct; 5. Vent; 6. Air outlet; 7. Air passage; 8. Inner frame; 9. Adjustment assembly; 91. Motor; 92. Fixing rod; 93. Drive shaft; 94. Bearing; 10. Heating assembly; 11. Fan; 12. Overhead board; 13. Overhead layer; 14. Foundation floor; 100. Refrigeration unit. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0056] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" 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 spatially relative descriptions used here are interpreted accordingly.

[0057] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0058] like Figure 4-8 As shown, the present invention provides a down-flow air-conditioning unit (preferably a down-flow air-conditioning indoor unit in a machine room), comprising:

[0059] An evaporator 1, a water collecting pan 2 and a water baffle 3, wherein the water collecting pan 2 is located at the lower end of the evaporator 1, and the evaporator 1 forms an air duct 4 inside the evaporator 1 to allow air flow to flow through. A vent 5 is provided on the water collecting pan 2 below the air duct 4, so that the airflow at the periphery of the evaporator 1 enters the air duct 4 after heat exchange through the evaporator 1, and further passes downward through the vent 5. The water baffle 3 is also provided on the water collecting pan 2, and the vent 5 has a central axis. The lower end of the water baffle 3 is connected to the water collecting pan 2, and the upper end of the water baffle 3 extends upward and also in a direction close to the central axis, so as to extend to the top of the vent 5 (preferably to the vertical top of the vent) to form an inclined baffle.

[0060] The present invention provides a water baffle plate arranged on the water receiving tray, the lower end of the water baffle plate is connected to the water receiving tray, and the upper end of the water baffle plate extends upward and also extends in a direction close to the central axis of the vent to extend to the top of the vent, forming an inclined baffle plate, which can prevent wind-carrying water (especially horizontally) from entering the vent, especially from the bottom evaporator, and guide condensed water to flow into the water receiving trays on both sides, reduce the return air intensity at the bottom of the evaporator, and use the inclined baffle plate to intercept splashed water droplets; the upper and lower end surfaces of the platform surrounded by the inclined water baffle plates on all sides are through-flow holes for the circulation of return air, and the water baffle plate can be used to intercept water droplets carried by the wind outlet at the bottom of the evaporator, prevent water droplets from splashing on the air duct at the bottom, and avoid posing a safety threat to the fan at the bottom; the condensed water intercepted by the inclined baffle plate can flow downward along the baffle wall surface and return to the water receiving tray at the bottom of the evaporator, effectively solving the problem that the condensed water at the bottom of the evaporator inside the indoor unit of the down-air air-supply 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 plate 3 forms an air port 6 for accommodating passing wind, and below the air port 6 is an air passage 7 surrounded by the water baffle plate 3. The air port 6, the air passage 7 and the vent 5 are sequentially connected from top to bottom, and the upper part of the air port 6 is connected to the air duct 4;

[0063] The water baffle plate 3 can block the condensed water at the bottom of the evaporator 1 , and at the same time allow at least part of the airflow passing through the bottom of the evaporator 1 to pass through the water baffle plate 3 and be guided to the air outlet 6 and the air passage 7 .

[0064] The present invention uses the air outlet on the upper end of the water baffle and the air passage surrounded by the water baffle, so that the upper part of the air outlet is connected with the air duct of the evaporator, and the lower part of the air outlet is connected with the air passage, so that after the air flow passes through the evaporator from the periphery of the evaporator for heat exchange, the condensed water at the bottom of the water pan is effectively blocked by the water baffle, but the wind is allowed to flow upward to the air outlet and the air passage through the inclined baffle. Compared with the vertical baffle, the present invention can not only block the condensed water from entering the vent, but also introduce the cold air below that has undergone heat exchange into the vent, which can increase the cold air outlet effect and improve the cooling efficiency and cooling performance of the air conditioner.

[0065] In some embodiments,

[0066] In the projection plane of the horizontal water receiving surface of the water receiving tray 2, the vent 5 is a quadrilateral opening structure (preferably a rectangle), including a first side and a second side opposite to each other, and a third side and a fourth side opposite to each other. The evaporator 1 is a "U"-shaped structure, and the "U"-shaped structure is located at the periphery of the vent 5 and is opposite to the first side, the second side and the third side, 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 side, and the lower end of the first baffle 31 is located at the periphery of the first side, the upper end of the first baffle 31 extends to the top of the vent 5 (preferably opposite to the vent 5 in the vertical direction), the second baffle 32 is opposite to the second side, and the lower end of the second baffle 32 is located at the periphery of the second side, the upper end of the second baffle 32 extends to the top of the vent 5 (preferably opposite to the vent 5 in the vertical direction), the third baffle 33 is opposite to the third side, and the lower end of the third baffle 33 is located at the periphery of the third side, and the upper end of the third baffle 33 extends to the top of the vent 5 (preferably opposite to the vent 5 in the vertical direction).

[0068] This is a further preferred structural form of the evaporator and water baffle of the present invention. The evaporator is preferably a "U"-shaped structure, which can form three-sided air inlet, and heat exchange through the evaporator to increase the heat exchange area. Matching this, the water baffle is also a three-sided structure, that is, the first baffle is opposite to the first side section of the U-shaped structure, and can block the condensed water at the bottom generated by its refrigeration; the second baffle is opposite to the second side section of the U-shaped structure, and can block the condensed water at the bottom generated by the refrigeration of the second side section; the third baffle is opposite to the third side section of the U-shaped structure, and can block the condensed water at the bottom generated by the refrigeration of the third side section. The three baffles are all inclined to extend vertically above the vent, which can block the condensed water generated by the three side section evaporators to the greatest extent and prevent the condensed water from splashing into the vent.

[0069] In some embodiments,

[0070] An inner frame 8 is arranged upwardly at the edge of the vent 5, and the lower end of the water retaining plate 3 is arranged on a side of the inner frame 8 away from the vent 5 and is arranged in close contact with the inner frame 8;

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

[0072] The present invention further provides an upwardly protruding inner frame structure at the edge of the vent, which can block the water in the water tray around the vent. At the same time, the lower end of the water baffle is fitted with the side of the inner frame away from the vent, which can further block the condensed water generated by the evaporator on the water tray from entering the vent, further playing a role in waterproofing and sealing the vent. The inner frame includes inner frames in four directions, which can block water around the rectangular vent. Each inner frame is fitted with the corresponding baffle, which can block water in multiple directions, further improving the waterproof sealing effect of the vent, and preventing the condensed water at the bottom of the evaporator inside the indoor unit of the down-air air-conditioning from flowing with the return air and splashing into the air duct below.

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

[0074] The present invention can further block the condensed water in the water tray by setting the fourth baffle, and the fourth baffle extends in the vertical direction or the upper end extends in the direction away from the central axis of the vent, which can effectively increase the wind area of ​​the vent, increase the air flow rate, and improve the refrigeration heat exchange efficiency.

[0075] The present invention connects an inclined baffle plate to the inner frame of the water receiving tray, thereby reducing the return air intensity at the bottom of the evaporator and intercepting splashed water droplets by using the inclined baffle plate; the upper and lower end surfaces of the platform surrounded by the inclined water baffle plates are through-flow holes for the circulation of return air (i.e., through the air outlet and the air channel), and the electric heating component can be fixed inside the platform surrounded by the water baffle plates. The return air is heated by the electric heating component, and splashed condensed water can be prevented from posing a safety threat to the electric heating component.

[0076] Beneficial effects: The water baffle is used to intercept the water droplets carried by the air outlet at the bottom of the evaporator, preventing the water droplets from splashing on the air duct at the bottom and avoiding a safety threat to the fan at the bottom; the condensed water intercepted by the inclined baffle can flow downward along the baffle wall and return to the water receiving tray at the bottom of the evaporator; the water baffle can also serve as a fixed foundation for the electric heating component, 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 downward air supply refrigeration unit structure includes an overall frame, a centrifugal fan and an evaporator placed in the frame, wherein the evaporator is placed on the upper part of the frame, and the centrifugal fan is placed at the bottom of the frame; when the refrigeration unit leaves the factory, the bottom end of the centrifugal fan component is installed and fixed on the chassis of the frame of the refrigeration unit, and when it is installed on-site in the data center, the centrifugal fan component is moved downward into the overhead layer after the fixing device is removed, and the upper end of the centrifugal fan component is fixed on the chassis of the frame again; when the centrifugal fan is running, the return air passes through the fin gap of the evaporator from the outer side 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, and then flows upward from the air supply holes of the overhead layer into the data center room, cools the heat-generating equipment in the data center, and the heated return air passes through the evaporator fins from the outer side of the refrigeration unit again, forming a complete return air cycle.

[0078] A water collecting pan is arranged at the bottom of the evaporator, and there is a certain height distance between the water collecting pan and the bottom plate of the overall frame. The space between the water collecting pan and the bottom plate of the overall frame is mainly used to accommodate the centrifugal fan components when leaving the factory; the water collecting pan is horizontally fixed on the overall frame as a supporting and mounting structure of the evaporator, and the water collecting pan receives the low-temperature condensed water generated when the evaporator is refrigerated, and discharges it through the drain pipe. The middle position of the water collecting pan is hollow and has an inner frame arranged upward. The adjacent parts of the inner frames of each water collecting pan are welded and sealed to prevent the condensed water from leaking downward from the flow hole in the middle to the centrifugal fan components below. The hollow through structure formed by the inner frame of the water collecting pan serves as a flow hole for return air, allowing the return air to enter the lower position 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 action of the centrifugal fan, and the air enters the centrifugal fan from top to bottom after heat exchange and refrigeration, and is sent into the overhead layer after being pressurized and accelerated by the centrifugal fan. The water vapor in the return air condenses into water droplets on the evaporator, and the condensed water converges downward The condensed water in the evaporator flows downward along the surface of the heat exchange fins under the action of gravity and gathers in the water collection pan at the bottom of the evaporator. Therefore, the closer the heat exchange area of ​​the evaporator is to the bottom water collection pan, the more condensed water is gathered. Even the fin gaps in the heat exchange area at the bottom of the evaporator are filled with condensed water, which makes it difficult for the return air to pass through these fin gaps filled with condensed water, thereby affecting the heat exchange effect of this area. Another possible situation is that when the fin gaps in the bottom area are filled with discontinuous condensed water, the flowable gaps in the fin gaps become smaller, thereby increasing the speed of the return air. At the same time, under the suction action of the centrifugal fan, the return air volume at the bottom of the evaporator close to the centrifugal fan is greater than the return air volume at the top of the evaporator. The combination of these two factors may carry the condensed water between the fins at the bottom of the evaporator away from the fin surface, and some of the condensed water flows and splashes with the return air. This situation is more obvious under high temperature and humid return air and large cooling capacity and large air volume operating conditions (reference 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 operation 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 evaporation temperature is usually relatively low when the refrigeration unit has a large cooling capacity output, which makes it easier for condensation to occur in the return air; under large air volume conditions, the evaporator's headwind speed is greater, and the wind speed within the fin spacing is also greater, so it is easier to blow away the condensed water droplets on the fin surface, making it easier for the return air to carry water.

[0079] The space between the water tray and the chassis of the refrigeration unit is used to accommodate and fix the centrifugal fan components when leaving the factory; the drawings provided in this technical solution are all schematic diagrams, not complete and real refrigeration unit product design drawings, which are used to understand this technical solution.

[0080] like Figure 4 and Figure 5As shown, the present invention improves the design of the above-mentioned refrigeration unit by adding a front baffle (fourth baffle 34), a rear baffle (third baffle 33), a left baffle (first baffle 31) and a right baffle (second baffle 32) connected to the original inner frame of the water receiving tray. It can be understood that if the inner frame of the water receiving tray of the original unit is a triangle with only three inner frames, then the present invention correspondingly adopts three newly added baffles to match it, and the rest of the cases are similar.

[0081] Preferably, the front, rear, left and right baffles are tilted upward, and sealing measures (such as welding, one-piece molding technology, soft adhesive tape, or a combination of these measures, etc.) are implemented at the places where they are connected to each other and at the places where each baffle is connected to the inner frame of the water collection tray to prevent condensed water from falling from the connecting gaps to the centrifugal fan components at the bottom.

[0082] Preferably, the top ends of the inclined baffles are located at the same height, and a flow hole (i.e., air outlet 6) is formed at the top ends so that the return air passes through the flow hole from the upper part of the refrigeration unit into the lower part of the refrigeration unit;

[0083] Furthermore, the front baffle is preferably located in the opening area of ​​the evaporator (the present invention preferably adopts a U-shaped evaporator, and the "opening" is the opening of the U-shaped character where there is no heat exchange area. The U-shaped evaporator is the most commonly used structural type for downflow air supply units, which can greatly increase the heat exchange area of ​​the evaporator, reduce the overall structural size of the refrigeration unit, and make the refrigeration unit more compact; the actual refrigeration unit uses a sealing plate to seal 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 present invention), and the front baffle is vertically arranged. Because there is no return air circulation at the opening of the U-shaped evaporator, the front baffle does not need to block the condensed water. Therefore, the front baffle is vertically arranged or tilted away from the middle opening, which can increase the return air circulation area of ​​the middle opening ( Figure 5 It can be seen from the figure that the front baffle is set vertically).

[0084] In some embodiments,

[0085] The upper surface of the water baffle plate 3 is inclined to the horizontal plane, and the two are arranged at an angle between (0, 90°). The inclined angle between the upper surface of the water baffle plate 3 and the horizontal plane can also be adjusted.

[0086] The present invention also enables the water retaining plate to have an adjustable tilt angle, thereby changing the tilt angle and effective water retaining height of the water retaining plate to meet the operating conditions of different wind volumes.

[0087] In some embodiments,

[0088] When the water baffle 3 includes a first baffle 31 and a second baffle 32, an adjustment component 9 is further provided between the first baffle 31 and the second baffle 32 relative to each other, and the adjustment component 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 inclination angle between the upper surface of the first baffle 31 and the horizontal plane, and adjust the change of the inclination angle between the upper surface of the second baffle 32 and the horizontal plane.

[0089] The present invention sets an adjustment component between the first and second relative baffles, which can adjust the distance between the first and second baffles to decrease or increase, thereby adjusting the inclination angle of the first baffle to change, and adjusting the inclination angle of the second baffle to change, so that according to different air volume regulator inclination angle changes, it is preferred to increase the length of the adjustment component when the air volume is large, increase the inclination angle of the baffle, can enhance the effect of intercepting condensed water droplets, and reduce the inclination angle when the air volume is small, to ensure that the airflow at the bottom can enter the vent as much as possible, thereby improving the refrigeration performance.

[0090] In some embodiments,

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

[0092] The present invention preferably adopts a method of using a hard waterproof material for one relative group of water baffles and a soft waterproof material for another relative group of water baffles. When the length of the adjustment component is changed by a drive motor fixed on the adjustment component, thereby changing the relative distance of the hard plates, the third and fourth baffles connected between the first and second baffles are preferably made of flexible materials that can be deformed to adapt to the changes in the inclination angles of the first and second baffles, thereby changing the inclination angles of the water baffles and the effective water retaining height to meet the operating conditions of different wind volumes.

[0093] The present invention provides an inclined baffle connected to the inner side frame of the water receiving tray to reduce the return air strength at the bottom of the evaporator and intercept splashed water drops by using the baffle; the upper and lower end surfaces of the platform surrounded by the water baffles are through channels for the circulation of return air.

[0094] Preferably, one relative group of water retaining plates is made of hard water-impermeable material, and another relative group of water retaining plates is made of soft water-impermeable material. An adjustment component is connected between the hard plates. The length of the adjustment component is changed by a drive motor fixed on the adjustment component, thereby changing the relative distance of the hard plates, thereby changing the inclination angle of the water retaining plate and the effective water retaining height to meet the operating conditions of different wind volumes.

[0095] In the present invention, preferably, one set of opposite water retaining plates is made of hard water-impermeable material, and the other set of opposite water retaining plates is made of soft water-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 receiving tray and the soft plate (i.e. the connection technology between the soft and hard materials) are connected by crimping, gluing, screwing, rivet fixing, line sewing or a combination of these connection technologies, and are sealed with materials such as waterproof sealant; the hard plate and the inner frame of the water receiving tray are connected by hinges and bonded with soft sealing tape to prevent condensed water from leaking, so that the inclination angle of the hard plate can be adjusted.

[0096] The present invention preferably has a horizontally arranged adjustment component connected between the two hard plates (left baffle and right baffle), and the adjustment component can change the length of the adjustment component through its own driving motor, thereby changing the distance between the tops of the two hard plates, and then changing the inclination angle of the water baffle and the effective water retaining height, so as to meet different operating conditions. For example, in the case of large air volume, the length of the adjustment component is increased, so that the inclination angle of the baffle is larger, and the interception of condensed water droplets is more effective (reference Figure 6 and Figure 7 ), the front baffle and the rear baffle of the soft material change their shapes according to their own flexible material characteristics.

[0097] In some embodiments,

[0098] The adjustment assembly 9 includes a motor 91, a fixing rod 92, a driving shaft 93 and a bearing 94. One end of the fixing rod 92 is connected to the first baffle 31, and one end of the driving shaft 93 is connected to the second baffle 32 through the bearing 94. The other end of the fixing rod 92 is opposite to the other end of the driving shaft 93 and forms a threaded connection. The motor 91 is connected to the driving shaft 93 to drive the driving shaft 93 to rotate, thereby increasing or shortening the distance between one end of the fixing rod 92 and one end of the driving shaft 93.

[0099] This is the preferred structural form of the adjustment component of the present invention. Through the structural form of the fixed rod and the driving shaft, the first and second baffles can be connected respectively, and the driving shaft is driven to rotate by the motor, so that the threaded fixed rod and the driving shaft can have a relative linear motion, and move relatively away or relatively close, thereby achieving the effect of adjusting the distance between the first and second baffles, and achieving the effect of adjusting the change in the inclination angle of the first and second baffles.

[0100] In some embodiments,

[0101] The other end of the fixing rod 92 is provided with an internal threaded hole toward the inside thereof, and the other end of the driving shaft 93 is provided with an external thread on its outer periphery, and the external thread forms a threaded fit with the internal threaded hole. A sliding groove is provided on the outer peripheral surface of the driving shaft 93, and the sliding groove is parallel to the central axis of the driving shaft 93. The motor 91 includes a driving wheel, and the driving wheel is sleeved on the outer periphery of the driving shaft 93, and the inner periphery of the driving wheel is also provided with a convex strip, and the convex strip is clamped in the sliding groove so as to be able to slide along the sliding groove, and the driving wheel can drive the driving shaft 93 to rotate.

[0102] This is a further preferred matching mode of the fixing rod and the driving shaft of the present invention, that is, a threaded matching structure formed by the internal threaded hole of the fixing rod and the external thread at one end of the driving shaft, and a clamping fit is formed between the sliding groove provided on the driving shaft and the convex strip on the motor driving wheel, so that the convex strip can slide along the sliding groove, so that the driving wheel and the driving shaft rotate as a whole in the rotation direction, effectively driving the driving shaft to rotate.

[0103] The adjustment component of the present invention refers to Figure 8 As shown, the adjustment assembly is composed of a fixed rod, a driving shaft, a motor and a bearing. A threaded matching structure is adopted between the driving shaft and the fixed rod (for example, the driving shaft adopts an external thread structure and the fixed rod adopts an internal thread structure). When the driving rod rotates, it can enter or exit relative to the fixed rod, thereby changing the length of the entire adjustment assembly.

[0104] A slide groove is arranged on the surface of the driving shaft and is parallel to the central axis of the cylindrical driving shaft itself. The 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 slide groove to achieve free sliding. The combination of the convex strip and the slide groove ensures that there is no relative rotation 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. When the driving wheel of the motor rotates, it drives the driving shaft to rotate, and a threaded pair movement is realized between the driving shaft and the fixed rod, so that the driving shaft can enter or exit relative to the fixed rod, thereby changing the length of the entire adjustment component.

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

[0107] In some embodiments,

[0108] A heating component 10 is further provided in the air passage 7 and / or the inner frame 8 .

[0109] The present invention also provides a heating component, so that the cold air after being cooled by the evaporator can be heated by the heating component after being blocked by the water baffle, thereby ensuring the required temperature range indoors and ensuring constant temperature and humidity, thereby improving user comfort.

[0110] In some embodiments,

[0111] The heating assembly 10 is fixed on the wall surface of the water baffle 3 facing the vent 5, and / or the heating assembly 10 is fixed on 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 heating assembly 10 in at least two rows is arranged in a criss-cross manner along the vertical direction.

[0112] The heating component of the present invention can be preferably fixed to the opposite side of the water baffle located at the air supply channel, and can also be preferably fixed to the inner frame of the vent, and can also be preferably fixed to the opposite inner side edge of the inner frame; it is further preferred that the heating component is arranged in a criss-cross multi-row structure in the vertical direction, which can increase the contact area with the airflow and improve the heat exchange performance and heat exchange efficiency.

[0113] The electric heating assembly of the present invention is preferably arranged inside the enclosure formed by the water baffle and fixed on the inner frame of the water receiving tray, and the return air is heated by the electric heating assembly; the upper and lower groups of electric heating assemblies can be respectively arranged at different heights and form a criss-cross arrangement in the horizontal projection.

[0114] The down-air supply refrigeration unit of the present invention preferably further includes an electric heating component, which is composed of a plurality of electric heating parts; the electric heating component is a PTC electric heater.

[0115] Further preferably, the electric heating component is horizontally arranged, and its two ends are fixed on the inner frame of the water receiving tray and / or the bottom of the water receiving tray; the heat-generating component of the electric heating component spans the horizontal projection of the circulation hole.

[0116] Further preferably, the electric heating component is arranged horizontally, and its two ends are respectively fixed on the inner frame of the water receiving tray to which the left baffle and the right baffle are connected.

[0117] Further preferably, the other set of electric heating components is arranged horizontally ( Figure 5 The two ends of the electric heating components are respectively fixed on the inner frame of the water receiving tray to which the front baffle and the rear baffle are connected, and this group of electric heating components and the other group of electric heating components are arranged at different heights, and the two groups of electric heating components form a criss-cross arrangement in horizontal projection.

[0118] The return air from the circulation hole (air outlet 6) is electrically heated for heat treatment before entering the centrifugal fan for accelerated pressurization. The electric heating component is arranged behind the baffle to avoid splashing of condensed water, thereby ensuring the electrical safety performance of the electric heating component.

[0119] In some embodiments,

[0120] A fan 11 is disposed below the water receiving tray 2 , an air inlet of the fan 11 is opposite to the vent 5 , and an air outlet of the fan 11 faces indoors.

[0121] The present invention further provides a fan under the water receiving tray so that its air inlet and the vent are opposite and connected, so that the air flow after heat exchange in the evaporator can be exhausted, and the air flow sucked by the fan is blown into the room through the air outlet, thereby ensuring the indoor cooling and heating effect.

[0122] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A downflow air conditioning unit, characterized in that: include: An evaporator (1), a water receiving tray (2) and a water baffle (3), wherein the water receiving tray (2) is located at the lower end of the evaporator (1), and the evaporator (1) forms an air duct (4) inside the evaporator (1) for allowing air to flow through. A vent (5) is provided on the water receiving tray (2) below the air duct (4), so that airflow at the periphery of the evaporator (1) enters the air duct (4) after heat exchange with the evaporator (1), and further passes downward through the vent (5). The water baffle (3) is also provided on the water receiving tray (2), and the vent (5) has a central axis. The lower end of the water baffle (3) is connected to the water receiving tray (2), and the upper end of the water baffle (3) extends upward and also extends in a direction close to the central axis to extend to the top of the vent (5), forming an inclined baffle.

2. The downflow air conditioning unit according to claim 1, characterized in that: The upper end of the water baffle (3) forms an air outlet (6) for accommodating passing wind, and below the air outlet (6) is an air passage (7) surrounded by the water baffle (3); the air outlet (6), the air passage (7) and the vent (5) are connected in sequence from top to bottom, and the air outlet (6) is connected to the air duct (4) above; The water baffle (3) can block the condensed water at the bottom of the evaporator (1), and at the same time allow at least part of the airflow passing through the bottom of the evaporator (1) to pass through the water baffle (3) and be guided to the air outlet (6) and the air passage (7).

3. The downflow air conditioning unit according to claim 1, characterized in that: In the projection plane of the horizontal water receiving surface of the water receiving tray (2), the vent (5) is a quadrilateral opening structure, including a first side and a second side opposite to each other, and a third side and a fourth side opposite to each other; the evaporator (1) is a "U"-shaped structure, and the "U"-shaped structure is located at the periphery of the vent (5) and is respectively opposite to the first side, the second side and the third side; The water 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 at the periphery of the first edge, and the upper end of the first baffle (31) extends to the top of the vent (5); the second baffle (32) is opposite to the second edge, and the lower end of the second baffle (32) is located at the periphery of the second edge, and the upper end of the second baffle (32) extends to the top of the vent (5); the third baffle (33) is opposite to the third edge, and the lower end of the third baffle (33) is located at the periphery of the third edge, and the upper end of the third baffle (33) extends to the top of the vent (5).

4. The downflow air conditioning unit according to claim 3, characterized in that: The water baffle (3) further comprises a fourth baffle (34); the fourth side of the vent (5) is opposite to the opening of the "U"-shaped structure; the fourth baffle (34) is located at the periphery of the fourth side and is arranged opposite to the third baffle (33); the first baffle (31), the third baffle (33), the second baffle (32) and the fourth baffle (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 (34) is connected to the water receiving tray (2) and / or the fourth side; the upper end of the fourth baffle (34) extends in a vertical direction or the upper end of the fourth baffle extends upward in a direction away from the central axis of the vent (5).

5. The downflow air conditioning unit according to claim 4, characterized in that: An inner frame (8) is arranged upwardly on the edge of the vent (5); the lower end of the water retaining plate (3) is arranged on a side of the inner frame (8) away from the vent (5) and is arranged in close contact with the inner frame (8); The inner frame (8) comprises a first inner frame located on the outer periphery of the first side and protruding upward, a second inner frame located on the outer periphery of the second side and protruding upward, a third inner frame located on the outer periphery of the third side and protruding upward, and a fourth inner frame located on the outer periphery of the fourth side and protruding upward. The lower end of the first baffle (31) is arranged in contact with a surface of the first inner frame facing away from the vent (5), the lower end of the second baffle (32) is arranged in contact with a surface of the second inner frame facing away from the vent (5), the lower end of the third baffle (33) is arranged in contact with a surface of the third inner frame facing away from the vent (5), and the lower end of the fourth baffle (34) is arranged in contact with a surface of the fourth inner frame facing away from the vent (5).

6. The downflow air conditioning unit according to any one of claims 1 to 5, characterized in that: The upper surface of the water retaining plate (3) is arranged obliquely to the horizontal plane, and the two are arranged at an angle between (0, 90°), and the inclination angle between the upper surface of the water retaining plate (3) and the horizontal plane can also be adjusted.

7. The downflow air conditioning unit according to claim 6, characterized in that: When the water baffle (3) comprises a first baffle (31) and a second baffle (32), an adjustment component (9) is further provided between the first baffle (31) and the second baffle (32) relative to each other, and the adjustment component (9) is capable of adjusting the distance between the first baffle (31) and the second baffle (32) to decrease or increase, so as to adjust the change of the inclination angle between the upper surface of the first baffle (31) and the horizontal plane, and to adjust the change of the inclination angle between the upper surface of the second baffle (32) and the horizontal plane.

8. The downflow air conditioning unit according to claim 7, characterized in that: When the water baffle (3) further includes a third baffle (33) and a fourth baffle (34), the first baffle (31) and the second baffle (32) are both 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.

9. The downflow air conditioning unit according to claim 7, characterized in that: The adjustment assembly (9) comprises a motor (91), a fixing rod (92), a driving shaft (93) and a bearing (94); one end of the fixing 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 fixing rod (92) is opposite to the other end of the driving shaft (93) and is threadedly connected; the motor (91) is connected to the driving shaft (93) so as to drive the driving shaft (93) to rotate, thereby increasing or decreasing the distance between one end of the fixing rod (92) and one end of the driving shaft (93).

10. The downflow air conditioning unit according to claim 9, characterized in that: The other end of the fixing rod (92) is provided with an internal threaded hole toward the inside thereof, and the other end of the driving shaft (93) is provided with an external thread on its outer periphery, and the external thread forms a threaded fit with the internal threaded hole. A sliding groove is provided on the outer peripheral surface of the driving shaft (93), and the sliding groove is parallel to the central axis of the driving shaft (93). The motor (91) includes a driving wheel, and the driving wheel is sleeved on the outer periphery of the driving shaft (93), and the inner periphery of the driving wheel is also provided with a convex strip, and the convex strip is clamped in the sliding groove so as to be able to slide along the sliding groove, and the driving wheel can drive the driving shaft (93) to rotate.

11. The downflow air conditioning unit according to claim 5, characterized in that: A heating component (10) is also provided in the air passage (7) and / or in the inner frame (8).

12. The downflow air conditioning unit according to claim 11, characterized in that: The heating component (10) is fixed on the wall surface of the water baffle (3) facing the vent (5), and / or the heating component (10) is fixed on the inner wall of the inner frame (8); The heating components (10) are arranged in at least one row in the vertical direction. When there are at least two rows, the heating components (10) in the at least two rows are arranged in a crisscross pattern in the vertical direction.

13. The downflow air conditioning unit according to any one of claims 1 to 12, characterized in that: A fan (11) is arranged below the water receiving tray (2), the air inlet of the fan (11) is opposite to the vent (5), and the air outlet of the fan (11) faces the indoor room.

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