Water pan assembly and air conditioning unit

Abstract

The application discloses a water receiving tray assembly and an air conditioning unit, wherein the water receiving tray assembly comprises a first water receiving tray with a first water receiving groove; and a second water receiving tray with a second water receiving groove, the second water receiving tray being connected to the first water receiving tray, and the first water receiving groove and the second water receiving groove being isolated from each other. The water receiving tray assembly and the air conditioning unit effectively solve the problem that the condensate water accumulated in the water receiving tray causes the air conditioning unit to lose cold energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration technology, in particular to a water pan assembly and an air conditioning unit. BACKGROUND

[0002] The aircraft ground air conditioning unit is a new air-conditioning unit with fresh air, and the processed air is high-temperature and high-humidity gas. The unit adopts direct evaporative refrigeration cycle technology, and through the evaporation of refrigerant in the evaporator coil, the air passing through the evaporator is cooled and dehumidified. A fan with strong air supply pressure is used to send low-temperature air into the aircraft cabin through a long specially designed air supply hose and a special joint.

[0003] In order to reduce the temperature and humidity of the processed air, the evaporator of the air conditioning unit must have sufficient refrigeration and dehumidification capacity. Due to the large pressure difference before and after the evaporator, the air duct from the evaporator to the air supply fan forms a large negative pressure chamber, which causes the condensate water to be unable to drain automatically. When the aircraft ground air conditioning unit is hoisted on the bridge, the height of the aircraft ground air conditioning unit must be reduced as much as possible due to the height limitation of the bridge. Therefore, under the condition of high negative pressure in the unit, it is difficult to drain the condensate water. At present, the air conditioning unit usually uses a water storage bend to drain water, but due to the height limitation of the aircraft ground air conditioning unit, this method cannot be used.

[0004] In the prior art, the condensate water of the aircraft ground air conditioning unit cannot be normally drained, which causes the condensate water to accumulate in the water pan, and the accumulated condensate water will weaken the heat exchange capacity of the evaporator, causing the air conditioning unit to lose cold energy. SUMMARY

[0005] In the embodiment of the present application, a water pan assembly and an air conditioning unit are provided to solve the problem of the condensate water accumulating in the water pan in the prior art, which causes the air conditioning unit to lose cold energy.

[0006] To achieve the above-mentioned purpose, the present application provides a water pan assembly, comprising: a first water pan having a first water groove; a second water pan having a second water groove, the second water pan being connected to the first water pan, and the first water groove and the second water groove being isolated from each other.

[0007] Further, a partition plate is connected to the second water pan, the partition plate is arranged in the second water groove, the partition plate divides the second water groove into a first chamber and a second chamber, and a first throttling hole is arranged on the partition plate; the first chamber is in communication with the groove of the second water groove; the first chamber and the second chamber are in communication through the first throttling hole; and the second chamber is in communication with the drain hole of the second water pan.

[0008] Further, a baffle is connected to the partition plate, the baffle is located in the first chamber, and the baffle divides the first chamber into at least two sub-chambers.

[0009] Further, the first throttling holes are multiple in number, and the number of the first throttling holes corresponds to the sub-chambers, and each sub-chamber is communicated with the second chamber through at least one first throttling hole.

[0010] Further, the partition plate is an elastic plate structure.

[0011] Further, the second water receiving tray is arranged in the first water receiving groove, and a water receiving space of the first water receiving groove is formed between an outer wall of the second water receiving tray and an inner wall of the first water receiving groove.

[0012] Further, the second water receiving tray protrudes from the first water receiving groove, and a slot of the second water receiving groove is located outside the first water receiving groove.

[0013] Further, the second water receiving tray protrudes from the first water receiving groove, and a slot of the second water receiving groove is located outside the first water receiving groove.

[0014] Further, the second water receiving tray protrudes from the first water receiving groove, and a slot of the second water receiving groove is located outside the first water receiving groove.

[0015] Further, an outer surface of the second water receiving tray is paved with a heat insulation layer.

[0016] According to another aspect of the present application, there is provided an air conditioning unit, comprising a heat exchanger, and the above-mentioned water receiving tray assembly arranged at the bottom of the heat exchanger.

[0017] Further, the first water receiving tray is located below the second water receiving tray, and the second water receiving tray is located below the heat exchanger; the first water receiving groove of the first water receiving tray is used to receive condensate water and rainwater at exposed pipes of the heat exchanger; and the second water receiving tray is arranged at a position such that the second water receiving groove receives condensate water inside the heat exchanger.

[0018] Further, the bottom of the heat exchanger has a lower guard plate with second throttling holes, the lower guard plate is connected to the second water receiving tray, and the lower guard plate is located at the slot position of the second water receiving groove, and the second throttling holes are communicated with the second water receiving groove; and the condensate water inside the heat exchanger enters the second water receiving groove through the second throttling holes.

[0019] Further, the second water receiving tray is arranged in the first water receiving groove, and a water receiving space of the first water receiving groove is formed between an outer wall of the second water receiving tray and an inner wall of the first water receiving groove.

[0020] Further, the second water receiving tray is connected with a partition plate, the partition plate is arranged in the second water receiving groove, the partition plate divides the second water receiving groove into a first chamber and a second chamber, the partition plate is provided with a first throttling hole; the first chamber is communicated with the slot of the second water receiving groove; the first chamber and the second chamber are communicated through the first throttling hole; the second chamber is communicated with the drain hole of the second water receiving tray; the partition plate is connected with a baffle, the baffle is located in the first chamber, and the baffle divides the first chamber into at least two sub-chambers; the number of the heat exchangers is at least two, each heat exchanger corresponds to a sub-chamber, and the second throttling hole of each heat exchanger is communicated with the corresponding sub-chamber; the number of the first throttling holes is multiple, the number of the first throttling holes corresponds to the sub-chambers, and each sub-chamber is communicated with the second chamber through at least one first throttling hole.

[0021] Further, all the heat exchangers are arranged at intervals along the airflow direction of the heat exchange air duct, and all the sub-chambers are arranged in sequence along the airflow direction of the heat exchange air duct.

[0022] Further, the second water receiving tray protrudes from the first water receiving groove, the slot of the second water receiving groove is located outside the first water receiving groove; the lower guard plate is sealingly connected with the side wall of the heat exchange air duct where the heat exchanger is located, and the second water receiving tray is sealingly connected with the lower guard plate.

[0023] Further, the air conditioning unit is an aircraft ground air conditioning unit, and the heat exchanger is an evaporator.

[0024] Further, the air conditioning unit further comprises a first drain pipe communicated with the first water receiving groove and a second drain pipe communicated with the second water receiving groove, and the second drain pipe comprises N U-shaped bends arranged in series, wherein N is an integer and N≥1.

[0025] Further, the air conditioning unit comprises a variable frequency fan, and the air supply pressure of the variable frequency fan is P, wherein the greater the value of P is, the greater the value of N is.

[0026] The application provides a novel water receiving tray assembly structure, which is installed at the bottom of a heat exchanger to receive condensed water at different positions. A first water receiving groove of a first water receiving tray is used to receive condensed water and rainwater at exposed pipes of the heat exchanger, and a second water receiving groove of a second water receiving tray is used to receive condensed water inside the heat exchanger. The first water receiving groove and the second water receiving groove are isolated from each other, the internal and external condensed water is separated, the rainwater and the condensed water is separated, the cold and warm water is prevented from being mixed, the corresponding heat exchanger is prevented from exchanging heat with the condensed water, the heat load is reduced, the loss of cold energy is prevented, and the purpose of energy saving is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic view of the water receiving tray assembly of the embodiment of the application;

[0028] Figure 2is a structural schematic view of a second water pan of a water pan assembly according to an embodiment of the present application;

[0029] Figure 3 is a structural schematic view of a first drain pipe and a second drain pipe of a water pan assembly according to an embodiment of the present application;

[0030] Figure 4 is a schematic view of internal structure cooperation of an air conditioning unit according to an embodiment of the present application; and

[0031] Figure 5 is a structural schematic view of an air conditioning unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] The present application will be further described in conjunction with the accompanying drawings and specific embodiments, but not as a limitation to the present application.

[0033] Referring to Figures 1 to 3 According to an embodiment of the present application, a water pan assembly is provided, which is mainly applied in an aircraft ground air conditioning unit. The water pan assembly comprises a first water pan 10 and a second water pan 20. The first water pan 10 has a first water groove 11. The second water pan 20 has a second water groove 21. The second water pan 20 is connected to the first water pan 10. The first water groove 11 and the second water groove 21 are isolated from each other.

[0034] The present application provides a novel water pan assembly structure, which is installed at the bottom of a heat exchanger (evaporator) to receive condensate water at different positions. The first water groove 11 of the first water pan 10 is used to receive condensate water and rainwater (at a higher temperature) at exposed pipes of the heat exchanger 30. The second water groove 21 of the second water pan 20 is used to receive condensate water (at a lower temperature) inside the heat exchanger 30. The first water groove and the second water groove are isolated from each other. The internal and external condensate water is separated. The rainwater and the condensate water are separated. The cold and warm water is not mixed. The corresponding heat exchanger will not exchange heat with the condensate water. The heat load is reduced. The cold energy loss is prevented. The purpose of energy saving is achieved.

[0035] Preferably, in combination with Figure 2 and Figure 4 The second water pan 20 is connected with a partition plate 22. The partition plate 22 is arranged in the second water groove 21. The partition plate 22 divides the second water groove 21 into a first chamber 21a and a second chamber 21b. The partition plate 22 is provided with a first throttling hole 221. The first chamber 21a is in communication with the groove of the second water groove 21. The first chamber 21a and the second chamber 21b are in communication through the first throttling hole 221. The second chamber 21b is in communication with the drain hole of the second water pan 20.

[0036] If the heat exchanger is located downstream of the air flow of the fan inside the air conditioning unit, the heat exchanger is in the case of positive pressure high pressure, the condensate discharge pressure is too large, the condensate flow rate is too fast, and the cold energy is easily taken away, so the condensate needs to be depressurized, especially the condensate inside the evaporator. Therefore, the second water pan is further improved in the application, and the condensate is depressurized and slowed down by the first chamber 21a and the second chamber 21b. The specific principle is that the condensate first enters the first chamber 21a, and then enters the second chamber 21b through the first throttling hole 221. Since the first throttling hole 221 can reduce the fluid pressure, the air flow and the condensate are throttled again when passing through the first throttling hole 221, and the pressure is further reduced. The air flow through the partition plate 22 expands again in the second chamber 21b, the pressure is further reduced (i.e. the cavity effect reduces the pressure), the speed becomes zero, and the dynamic pressure is all changed into static pressure. The condensate is collected in the second chamber 21b, and enters the drainage system through the drainage hole of the second water pan 20 under the action of static pressure.

[0037] In order to further reduce the pressure, in this embodiment, the partition plate 22 is connected with a baffle 23, the baffle 23 is located in the first chamber 21a, and the baffle 23 divides the first chamber 21a into at least two sub-chambers 21c. The water-containing air flow flowing out or sprayed out of the evaporator collides, reflects, mixes, expands, and the pressure of the air flow is reduced, the speed is reduced, the noise is reduced, and the condensate collides, reflects, absorbs, settles, and aggregates. The number of sub-chambers 21c can be set according to the number of evaporators. If the evaporators of the air conditioning unit are multiple, sub-chambers corresponding to the number of evaporators are set, and the sub-chambers are used to receive the air flow and condensate flowing out of the bottom of each evaporator.

[0038] The number of first throttling holes 221 is multiple, and the number of first throttling holes 221 corresponds to the number of sub-chambers 21c. Each sub-chamber 21c communicates with the second chamber 21b through at least one first throttling hole 221. Each sub-chamber 21c communicates with the second chamber 21b, which constitutes a plurality of expansion and pressure reduction combinations to achieve the maximum pressure reduction effect.

[0039] The partition plate 22 is a flexible plate structure. The partition plate 22 is thin and has a certain elasticity, and a large number of first throttling holes are distributed on the partition plate. The partition plate can elastically reduce the kinetic energy of the air flow and the water droplets, and also reduce the fluid pressure through the first throttling holes.

[0040] The second water pan 20 is arranged in the first water groove 11, and the outer wall of the second water pan 20 and the inner wall of the first water groove 11 form a water receiving space of the first water groove 11. Figure 1The second water receiving tray 20 is located in the first water receiving groove, and the second water receiving tray and the first water receiving tray are in an overall up-down distribution position relationship. The second water receiving tray is welded on the first water receiving tray, and the side wall of the second water receiving tray, the groove bottom of the first water receiving groove and the partition plate 22 form the second chamber.

[0041] Of course, the first water receiving tray and the second water receiving tray can also be connected into an integral structure through an integral molding process. In the embodiment, the first water receiving tray and the second water receiving tray are both rectangular, and the first water receiving tray is punched, bent and welded from a sheet metal part. The bottom is in a stepped shape, and a skirt is provided around the periphery, and a pipe passing hole and a water outlet hole are provided thereon. In other embodiments not shown, the first water receiving tray and the second water receiving tray can also be circular, triangular or other shapes.

[0042] In order to ensure the heat insulation effect and prevent the water in the first water receiving groove and the second water receiving groove from exchanging heat, in the embodiment, a heat insulation layer 24 is laid on the outer surface of the second water receiving tray 20, and the heat insulation layer 24 is generally heat insulation sponge. Referring to Figure 4 The heat insulation layer 24 directly separates the contact area between the first water receiving groove and the second water receiving groove that can exchange heat, and plays a heat insulation role, further preventing the loss of cold energy.

[0043] Since the first water receiving tray 20 is installed in the first water receiving groove 11, in order to prevent the condensed water and rainwater in the first water receiving groove from flowing back or splashing into the second water receiving groove, the structure of the second water receiving tray 20 is improved: the second water receiving tray 20 protrudes from the first water receiving groove 11, and the groove opening of the second water receiving groove 21 is located outside the first water receiving groove 11. The first water receiving tray is located below the second water receiving tray as a whole, so that the condensed water in the second water receiving tray 20 cannot be mixed with rainwater and condensed water with higher temperature.

[0044] As shown in Figure 3 The water receiving tray assembly further includes a first drain pipe 41 and a second drain pipe 42, the first drain pipe 41 communicates with the first water receiving groove 11, and the second drain pipe 42 communicates with the second water receiving groove 21. The first drain pipe and the second drain pipe form two water inlets, and the first drain pipe and the second drain pipe converge into one outlet, that is, water is drained through one water outlet. The two drain pipes respectively drain the condensed water of the two water receiving grooves, and the advantage of this arrangement is that the water with more impurities in the first water receiving groove can be directly drained to prevent pollution in the unit, and the pipeline can be adjusted to a larger diameter, the drainage is not affected by other factors, and the drainage efficiency is high. The second drain pipe 42 is used for the condensed water of the second water receiving tray, and the second drain pipe 42 can be individually controlled to be closed. After the condensed water is reduced in pressure, when the accumulated water reaches a certain height, the water starts to drain under the action of static pressure, realizing periodic interval drainage.

[0045] Preferably, the second drain pipe 42 comprises N U-shaped bends 42a arranged in series, wherein N is an integer greater than or equal to 1.

[0046] N is an integer greater than or equal to 1, and N = 1, 2, 3, …, n. The specific value depends on the air supply pressure of the fan (high-pressure variable-frequency centrifugal fan) of the air conditioning unit (air conditioning unit for an airplane on the ground). The greater the air supply pressure, the greater the value of N. The second drain pipe 42 is composed of a plurality of PVC straight pipes, PVC elbows, and a PVC straight elbow tee joint (fusion joint) and forms N U-shaped bends 42a. The second drain pipe 42 functions to further reduce the pressure by using the frictional resistance along the straight pipe section, the local resistance of the elbow, and the static pressure of the liquid column, to achieve normal-pressure drainage; and to isolate the indoor and outdoor air by using the liquid sealing effect of the U-shaped bend, to prevent indoor air supply pollution, reduce the thermal load, and achieve energy saving. The liquid sealing position of the U-shaped bend moves between the first and Nth U-shaped bends as the frequency of the fan (high-pressure variable-frequency centrifugal fan) changes. When the frequency is the greatest, the liquid sealing position is located at the Nth U-shaped bend, and when the frequency is the smallest, the liquid sealing position is located at the first U-shaped bend. In this way, at least one liquid sealing position functions regardless of the frequency.

[0047] Suppose that the water inlet pressure of the second drain pipe 42 is P1, the water outlet pressure of the drain pipe is P0, and P0 is the atmospheric pressure. The pressure difference between P1 and P0 is ΔP, and ΔP = P1 - P0. When ΔP > 0, a liquid seal is established at the Nth U-shaped bend, and the second water pan immediately drains water once the water accumulates. When ΔP = 0, a liquid seal is established at the first U-shaped bend, and the water begins to drain under the action of static pressure as the water accumulates in the water pan. When ΔP < 0, a liquid seal is established between the first and Nth U-shaped bends, and no water is drained at this time. When the water accumulates to a certain height, the water begins to drain under the action of static pressure. In the above three cases, periodic gap drainage can be achieved. When the frequency of the high-pressure variable-frequency centrifugal fan changes, that is, when the outlet air supply pressure changes, real-time adaptation can be achieved.

[0048] The application further provides an embodiment of an air conditioning unit, as shown in Figure 4 and Figure 5 The air conditioning unit comprises a heat exchanger 30 and the water pan assembly of the above embodiment, and the water pan assembly is arranged at the bottom of the heat exchanger 30.

[0049] As shown in Figure 4 , the first water pan 10 is located below the second water pan 20, and the second water pan 20 is located below the heat exchanger 30. The first water groove 11 of the first water pan 10 is used to receive the condensate water and rainwater at the exposed pipe of the heat exchanger 30. The second water pan 20 is arranged at a position such that the second water groove 21 receives the condensate water inside the heat exchanger 30.

[0050] The new water pan assembly structure is installed at the bottom of the heat exchanger (evaporator) to receive condensate water at different positions. The first water pan 10 is used to receive condensate water and rainwater (higher temperature) at the exposed pipe of the heat exchanger 30; the second water pan 20 is used to receive condensate water (lower temperature) inside the heat exchanger 30. The first water pan and the second water pan are isolated from each other, and the internal and external condensate water is separated, and the rainwater and the condensate water is separated, so as to avoid the mixing of cold and warm water, so that the corresponding heat exchanger will not exchange heat with the condensate water, that is, to reduce the heat load and prevent the loss of cold energy, so as to achieve the purpose of energy saving.

[0051] It should be noted that the first water pan and the second water pan can be fixedly connected to the shell of the air conditioning unit or the internal air duct structure, as long as the setting position of the first water pan corresponds to the exposed pipe of the heat exchanger, so that the condensate water at the exposed pipe of the heat exchanger and the rainwater entering from the outside can flow into the first water pan along the exposed pipe of the heat exchanger by gravity. Similarly, the setting position of the second water pan corresponds to the internal heat exchange pipe of the heat exchanger, so that the condensate water inside the heat exchanger can flow into the second water pan along the internal heat exchange pipe by gravity after flowing to the bottom of the heat exchanger. The first water pan and the second water pan can be connected to different structures respectively, and there is no direct connection relationship between them. Of course, the first water pan and the second water pan can also be connected together and then fixed to the bottom of the shell of the air conditioning unit.

[0052] Preferably, the bottom of the heat exchanger 30 has a lower guard plate 31, the lower guard plate 31 has a second throttling hole 311, the lower guard plate 31 is connected to the second water pan 20, the lower guard plate 31 is located at the notch position of the second water pan 21, the second throttling hole 311 is in communication with the second water pan 21; the condensate water inside the heat exchanger 30 enters the second water pan 21 through the second throttling hole 311.

[0053] The lower guard plate of the heat exchanger (evaporator) is provided with a second throttling hole, which is not only used for discharging condensate water, but also can reduce the air flow pressure of the air flow passing through the second throttling hole. Moreover, the second throttling hole 311 and the second water pan 21 also form a cavity effect pressure reduction cooperation, which further reduces the air flow pressure.

[0054] The second water pan 20 is arranged in the first water pan 11, and a water receiving space of the first water pan 11 is formed between the outer wall of the second water pan 20 and the inner wall of the first water pan 11; the area and the setting position of the water receiving space correspond to the exposed pipe of the heat exchanger 30 and part of the outer periphery of the heat exchanger 30. Referring to Figure 4The water receiving space of the first water receiving tank 11 is for the exposed tubes of the heat exchanger and the area around them. Therefore, the structure of the first water receiving tank extends outward to the area around the heat exchanger in order to catch the condensate on the surface of the heat exchanger (exposed tube part) and the rainwater entering from the outside. The area of ​​the water receiving space can be selected according to the size of the air conditioning unit and the shape of the heat exchanger.

[0055] Preferably, a partition plate 22 is connected to the second water receiving tray 20. The partition plate 22 is disposed inside the second water receiving trough 21, dividing the second water receiving trough 21 into a first chamber 21a and a second chamber 21b. A first throttling orifice 221 is provided on the partition plate 22. The first chamber 21a communicates with the opening of the second water receiving trough 21. The first chamber 21a and the second chamber 21b are connected through the first throttling orifice 221. The second chamber 21b communicates with the drain hole of the second water receiving tray 20. A baffle 23 is connected to the partition plate 22. Baffle 23 is located in the first chamber 21a and divides the first chamber 21a into at least two sub-chambers 21c; there are at least two heat exchangers 30, each heat exchanger 30 corresponds to one sub-chamber 21c, and the second throttling orifice 311 of each heat exchanger 30 is connected to the corresponding sub-chamber 21c; there are multiple first throttling orifices 221, the number of which corresponds to the number of sub-chambers 21c, and each sub-chamber 21c is connected to the second chamber 21b through at least one first throttling orifice 221.

[0056] In this embodiment, there are two heat exchangers and two sub-chambers 21c. Each heat exchanger corresponds to a set of second throttling orifices 311 (there can be multiple orifices), and each heat exchanger corresponds to one sub-chamber to ensure that the condensate inside each heat exchanger can be collected by the second water receiving tray. Moreover, the baffle 23 separating the sub-chambers can block reflections, consume the internal kinetic energy of the airflow, reduce noise, and prevent condensate droplets from flowing back due to pressure differences between upstream and downstream.

[0057] Preferably, all heat exchangers 30 are spaced apart along the airflow direction of the heat exchange duct, and all sub-chambers 21c are arranged sequentially along the airflow direction of the heat exchange duct. The matching structure between the second water receiving tray and the heat exchanger can prevent condensation or airflow backflow caused by the gradual decrease in upstream and downstream air pressure, thus reducing sensible heat loss due to the gradual decrease in temperature. Figure 4 As shown, cross sections A-A and B-B are drawn through the center of the second throttling orifice of the lower evaporator guard plate, respectively. The corresponding temperatures and pressures at these cross sections are t and t, respectively. a t b P a P b Due to frictional resistance, P a >P b Let the pressure difference between the two be ΔP. z ΔPz = P a - P b Under the action of the pressure difference, the small water droplets discharged at A-A may flow back into the air duct through B-B, causing sensible heat loss. Let the temperature difference between A-A and B-B be ΔT Z , ΔT Z = t a - t b , because the evaporator gradually exchanges heat and cools down, t a > t b , let the sensible heat loss be Q, the mass of the backflow water droplets be m, and the specific heat of water be c, then Q = cmΔT Z . Therefore, without water droplets flowing back, the sensible heat loss can be avoided.

[0058] The air conditioning unit is an aircraft ground air conditioning unit, and the heat exchanger is an evaporator. The water pan assembly is arranged in the aircraft ground air conditioning unit, can realize normal pressure drainage through various pressure reduction actions, and avoid water spatter during drainage. When the heat exchanger is downstream of the air flow of the fan, the heat exchanger is under positive pressure, the water pan assembly can reduce the pressure through the pressure reduction structure, and realize normal pressure drainage. If the heat exchanger is upstream of the air flow of the fan, the heat exchanger is under negative pressure, and the water pan assembly can also realize pressure balance and can normally drain water.

[0059] The second water pan 20 protrudes from the first water groove 11, and the slot of the second water groove 21 is located outside the first water groove 11; the lower guard plate 31 is sealingly connected with the side wall of the heat exchange air duct, and the second water pan 20 is sealingly connected with the lower guard plate 31. The sealing cooperation between the shape of the second water pan 20 and the lower guard plate can play a role in heat preservation and insulation. Furthermore, the second water pan and the lower guard plate produce a fluid blocking effect, which is mainly aimed at the use environment of the aircraft ground air conditioning unit, can prevent outdoor hot air from leaking in and indoor cold air from leaking out.

[0060] The air conditioning unit further comprises a first drainage pipe 41 and a second drainage pipe 42, the first drainage pipe 41 is in communication with the first water groove 11; the second drainage pipe 42 is in communication with the second water groove 21, and the second drainage pipe 42 comprises N U-shaped bends 42a arranged in series, wherein N ≥ 1, and N is an integer.

[0061] The air conditioning unit comprises a variable frequency fan 50, and the air supply pressure of the variable frequency fan 50 is P, wherein the greater the value of P is, the greater the value of N is.

[0062] N≥1, and N = 1, 2, 3…n, the specific value depends on the air handling unit (airplane ground air conditioning unit) fan (high-voltage variable frequency centrifugal fan) air supply pressure P, the greater the air supply pressure P, the greater the value of N. The second drain pipe 42 is composed of several PVC straight pipes, PVC elbows and a PVC right-angle tee joint (fusion joint), and forms N U-shaped bends 42a. The function of the second drain pipe 42 is to further reduce the pressure by using the frictional resistance along the straight pipe section, the local resistance of the elbow, and the liquid column static pressure to achieve normal pressure drainage; at the same time, the liquid seal function of the U-shaped bend is used to isolate indoor and outdoor air, prevent indoor air supply pollution, reduce heat load, and achieve energy saving. The liquid seal position of the U-shaped bend moves between the first to the Nth U-shaped bend as the frequency of the fan (high-voltage variable frequency centrifugal fan) changes, and is located at the Nth U-shaped bend when the frequency is the largest, and is located at the first U-shaped bend when the frequency is the smallest. In this way, at least one liquid seal functions regardless of the frequency.

[0063] The airplane ground air conditioning unit includes a variable frequency centrifugal fan, a flexible joint, a heat exchange air duct, two evaporators, a water pan assembly, a drain pipe, a sponge (several), a sealing gasket (several), and the like. The variable frequency centrifugal fan is a power source for air supply. When the variable frequency centrifugal fan is upstream of the airflow, a positive pressure drainage system is used; when the variable frequency centrifugal fan is downstream of the airflow, i.e., behind the evaporator, a negative pressure drainage system is used. The high-frequency centrifugal fan, the flexible joint, the heat exchange air duct, and the two evaporators are in series, with sealing gaskets between adjacent components to form a sealed channel. The flexible joint functions as a flexible connection; the heat exchange air duct functions as a channel; and the evaporator functions as a heat exchanger. The airflow direction is from the variable frequency centrifugal fan to the heat exchange air duct. The water flow direction is from the inside of the evaporator to the second water pan, and the condensate water and rainwater outside the evaporator flow to the first water pan. The two water paths are combined in the drain pipe and then discharged from the water outlet of the drain pipe assembly. The variable frequency centrifugal fan, the flexible joint, the heat exchange air duct, the two evaporators, the water pan assembly, and the drain pipe assembly are all externally insulated to prevent cold leakage or freezing.

[0064] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0065] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and in the above description of the drawings merely mean that the objects so designated can be different from other objects denoted with the same designation or number, and do not necessarily have particular chronological or hierarchical orders. It should be understood that the data thus designated can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in orders other than those illustrated or described herein.

[0066] Of course, the above is the preferred embodiment of the present application. It should be noted that for those skilled in the art, several improvements and refinements can be made without departing from the basic principles of the present application, and these improvements and refinements are also considered within the scope of protection of the present application.

Claims

1. A water pan assembly, characterized by, The application relates to a water pan assembly. The water pan assembly comprises: a first water pan (10) provided with a first water groove (11); a second water pan (20) provided with a second water groove (21), the second water pan (20) is connected to the first water pan (10), and the first water groove (11) and the second water groove (21) are isolated from each other; a partition plate (22) is connected to the second water pan (20), the partition plate (22) is arranged in the second water groove (21), the partition plate (22) divides the second water groove (21) into a first chamber (21a) and a second chamber (21b), and a first throttling hole (221) is arranged on the partition plate (22); the first chamber (21a) is communicated with a groove opening of the second water groove (21); the first chamber (21a) and the second chamber (21b) are communicated through the first throttling hole (221); and the second chamber (21b) is communicated with a drain hole of the second water pan (20); 2. The drain pan assembly of claim 1, wherein, a baffle (23) is connected to the partition plate (22), the baffle (23) is located in the first chamber (21a), and the baffle (23) divides the first chamber (21a) into at least two sub-chambers (21c).

3. The drain pan assembly of claim 1, wherein, The number of the first throttling holes (221) is plural, the number of the first throttling holes (221) corresponds to the number of the sub-chambers (21c), and each sub-chamber (21c) is communicated with the second chamber (21b) through at least one first throttling hole (221). The partition plate (22) is an elastic plate structure.

4. The water pan assembly according to claim 1, wherein the second water pan (20) is arranged in the first water groove (11), and a water receiving space of the first water groove (11) is formed between an outer wall of the second water pan (20) and an inner wall of the first water groove (11).

5. The water pan assembly according to claim 4, wherein 6. The drain pan assembly of claim 1, wherein, the second water pan (20) protrudes from the first water groove (11), and a groove opening of the second water groove (21) is located outside the first water groove (11). Further comprising: a first drain pipe (41) communicated with the first water groove (11); 7. The drain pan assembly of claim 6, wherein, a second drain pipe (42) communicated with the second water groove (21).

8. The drain pan assembly of claim 1 or 4, wherein, The second drain pipe (42) comprises N U-shaped bends (42a) arranged in series, wherein N>=1, and N is an integer.

9. An air conditioning unit comprising a heat exchanger (30), characterised in that, An outer surface of the second water pan (20) is paved with a heat insulation layer (24). The water pan assembly according to any one of claims 1 to 8 is arranged at a bottom of the heat exchanger (30).

10. The air conditioning unit according to claim 9, wherein the first water pan (10) is located below the second water pan (20), and the second water pan (20) is located below the heat exchanger (30); the first water groove (11) of the first water pan (10) is used for receiving condensate water and rainwater at exposed pipes of the heat exchanger (30); The second water receiving tray (20) is arranged at a position such that the second water receiving groove (21) receives the condensed water inside the heat exchanger (30).

11. The air conditioning unit of claim 10, wherein, The bottom of the heat exchanger (30) is provided with a lower guard plate (31) having a second throttling hole (311), the lower guard plate (31) is connected to the second water receiving tray (20), the lower guard plate (31) is located at the notch position of the second water receiving groove (21), and the second throttling hole (311) is in communication with the second water receiving groove (21). The condensed water inside the heat exchanger (30) enters the second water receiving groove (21) through the second throttling hole (311).

12. The air conditioning unit of claim 10, wherein The second water receiving tray (20) is arranged in the first water receiving groove (11), and a water receiving space of the first water receiving groove (11) is formed between the outer wall of the second water receiving tray (20) and the inner wall of the first water receiving groove (11). The area and arrangement position of the water receiving space correspond to the exposed pipes of the heat exchanger (30) and the partial area of the outer periphery of the heat exchanger (30).

13. The air conditioning unit of claim 11, wherein The second water receiving tray (20) is connected with a partition plate (22), the partition plate (22) is arranged in the second water receiving groove (21), the partition plate (22) divides the second water receiving groove (21) into a first chamber (21a) and a second chamber (21b), and the partition plate (22) is provided with a first throttling hole (221); The first chamber (21a) is in communication with the notch of the second water receiving groove (21), the first chamber (21a) and the second chamber (21b) are in communication through the first throttling hole (221), and the second chamber (21b) is in communication with the drain hole of the second water receiving tray (20); The partition plate (22) is connected with a baffle (23), the baffle (23) is located in the first chamber (21a), and the baffle (23) divides the first chamber (21a) into at least two sub-chambers (21c); The number of the heat exchangers (30) is at least two, each heat exchanger (30) corresponds to a sub-chamber (21c), and the second throttling hole (311) of each heat exchanger (30) is in communication with the corresponding sub-chamber (21c); The number of the first throttling holes (221) is multiple, the number of the first throttling holes (221) corresponds to the sub-chambers (21c), and each sub-chamber (21c) is in communication with the second chamber (21b) through at least one first throttling hole (221).

14. The air conditioning unit of claim 13, wherein, All the heat exchangers (30) are arranged at intervals along the airflow direction of the heat exchange air duct, and all the sub-chambers (21c) are arranged in sequence along the airflow direction of the heat exchange air duct.

15. The air conditioning unit of claim 11, wherein The second water receiving tray (20) protrudes from the first water receiving groove (11), and the notch of the second water receiving groove (21) is located outside the first water receiving groove (11). The lower guard plate (31) is sealingly connected with the side wall of the heat exchange air duct where the heat exchanger is located, and the second water pan (20) is sealingly connected with the lower guard plate (31).

16. The air conditioning unit of claim 9, wherein The air conditioning unit is an aircraft ground air conditioning unit, and the heat exchanger is an evaporator.

17. The air conditioning unit of claim 16, wherein, Further comprising: A first drain pipe (41) in communication with the first water tank (11); A second drain pipe (42) in communication with the second water tank (21), the second drain pipe (42) comprising N U-shaped bends (42a) arranged in series, wherein N >= 1, and N is an integer.

18. The air conditioning unit of claim 17, wherein, The air conditioning unit comprises a variable frequency fan (50), and the air supply pressure of the variable frequency fan (50) is P, wherein the greater the value of P is, the greater the value of N is.

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