Embedded air conditioning unit

Abstract

An embedded air conditioning unit comprises a housing, wherein the housing has a condensation chamber, a fresh air chamber and an evaporation chamber, wherein the evaporation chamber is provided with an evaporator water receiving tray located below the evaporator; a bottom plate is provided at the lower part of the housing, wherein the bottom plate has an upwardly bent edge around it, and a sealing strip mounting bracket is provided on the outer side of the bottom plate, wherein the sealing strip mounting bracket is used to install a sealing strip, wherein the sealing strip encloses a closed annular area, wherein the area of ​​the annular area is smaller than the area of ​​the bottom plate; and a plurality of drainage holes are provided on the bottom plate, wherein the drainage holes are distributed on the outer side of the sealing strip. The bottom plate of the unit of the present invention is equivalent to a water receiving tray, and a plurality of drainage holes are provided around the bottom plate, wherein the accumulated water on the bottom plate can be quickly discharged from all directions, and it can be ensured that the non-water accumulation area separated by the sealing strip will not leak.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to an embedded air conditioning unit used on a rail transit train. Background Art

[0002] The air-conditioning units on rail transit trains are generally installed on the top of the train passenger compartment. The train may encounter rain and snow while traveling on the ground, which may cause water accumulation in the air-conditioning unit or on the top of the train. At the same time, the air-conditioning unit will also produce condensed water during operation. In order to ensure the normal operation of the train and the air-conditioning unit, rainwater or condensed water needs to be discharged in time. At present, the drainage method of rail trains mainly adopts the collective drainage method, which is to collect condensed water and rainwater inside the air-conditioning unit and then collect them through fixed water collection pipes for unified discharge. However, when encountering bad weather, such as heavy rain, due to the large amount of water accumulation, the centralized discharge has high requirements for drainage speed, which is easy to cause poor drainage. When there is too much water accumulation, there is a risk of water leakage in the train passenger compartment, which in turn affects the passengers' riding experience. Summary of the invention

[0003] The object of the present invention is to provide an embedded air-conditioning unit with good drainage effect for rail trains.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] An embedded air-conditioning unit comprises a body shell, wherein the body shell is provided with a condensation chamber, a fresh air chamber and an evaporation chamber, wherein the evaporation chamber is provided with an evaporator water receiving pan located below the evaporator; a bottom plate is provided at the lower part of the body shell, wherein the bottom plate has upwardly bent edges around, and a sealing strip mounting bracket is provided on the outer side of the bottom plate, wherein the sealing strip mounting bracket is used for mounting a sealing insert, wherein the sealing insert encloses a closed annular area, wherein the area of ​​the annular area is smaller than that of the bottom plate; and a plurality of drainage holes are provided on the bottom plate, wherein the drainage holes are distributed on the outer side of the sealing insert.

[0006] Furthermore, the sealing strip protrudes outward from the base plate, dividing the air-conditioning unit installation area below the embedded air-conditioning unit into a drainage and water accumulation area and a non-water accumulation area, wherein the drainage and water accumulation area is located on the outside of the sealing strip, and the non-water accumulation area is located on the inside of the sealing strip.

[0007] It can be seen from the above technical scheme that the present invention has improved the entire drainage structure of the air-conditioning unit, and the bottom plate of the air-conditioning unit is designed as an integral water collection tray for collecting the accumulated water of the entire air-conditioning unit, and drainage holes are arranged around the bottom plate, so that the accumulated water inside the air-conditioning unit can be quickly discharged from all directions, and water accumulation will not be caused by the inability to drain water in a certain area; and by means of a sealing strip arranged on the outer surface of the bottom plate, the installation area below the bottom of the unit is separated into a water accumulation area and a non-water accumulation area, and the water discharged from the drainage hole can only be collected in the water accumulation area, and the non-water accumulation area is effectively sealed and isolated to ensure that there will be no leakage in this area.

[0008] Preferably, the base plate is made of a whole plate of sheet metal.

[0009] Setting the air conditioner base plate as a whole plate eliminates the risk of base plate leakage.

[0010] More specifically, the drainage holes include a condensation chamber drainage hole, a fresh air chamber drainage hole and an evaporation chamber drainage hole. The condensation chamber drainage hole is located in the area where the condensation chamber is located and is communicated with the condensation chamber; the fresh air chamber drainage hole is located in the area where the fresh air chamber is located and is communicated with the fresh air chamber; the evaporation chamber drainage hole is communicated with the evaporator water receiving pan located in the evaporation chamber.

[0011] Multiple drainage holes are designed to be connected to different chambers inside the unit, which can effectively drain the accumulated water in each chamber without causing water accumulation.

[0012] Preferably, a water retaining cover plate and / or a water retaining beam and / or a water retaining cover is provided at the drainage hole.

[0013] A water retaining structure is arranged at the drainage hole, which has the function of resisting negative pressure and debris, and can ensure smooth drainage.

[0014] Furthermore, the evaporator water receiving pan includes a first water receiving pan, a second water receiving pan and a drain pipe. The first water receiving pan and the second water receiving pan are arranged at intervals and are connected to each other through at least one connecting pipe. The drain pipes are respectively arranged at opposite ends of the first water receiving pan, and the drain pipes are respectively arranged at opposite ends of the second water receiving pan.

[0015] The water receiving tray is designed as a double tray structure and is connected by a connecting pipe. When the water receiving tray is tilted left or right, the water in the water receiving tray at a higher position can flow into the water receiving tray at a lower position, thus preventing water from overflowing at a higher position.

[0016] Furthermore, the drain pipe includes a first drain pipe and a second drain pipe, the first drain pipe extends to the outside of the embedded air-conditioning unit, and the second drain pipe is connected to the drain hole on the bottom plate.

[0017] By placing the condensation drainage pipe inside, the risk of condensation that may occur when the evaporator condensation drainage pipe is placed outside in the prior art can be avoided.

[0018] Preferably, a sinking trough is provided in the first water receiving tray and the second water receiving tray. The sinking trough is located outside the water receiving tray and has the same length as the water receiving tray. The drain pipe is connected to the sinking trough.

[0019] A sinking groove is arranged on the outer side of the water receiving tray, which can increase the water storage capacity of a single water receiving tray when it is tilted left or right, and prevent the water in the water receiving tray from overflowing.

[0020] Furthermore, the second drain pipe is a square pipe, the second drain pipe is connected to the water receiving tray through a short pipe, and a drain nozzle is arranged at the bottom of the other end of the second drain pipe.

[0021] Furthermore, a rubber water seal is provided at the drainage nozzle.

[0022] Furthermore, a maintenance window is provided on the pipe wall of the second drain pipe, and the maintenance window is located on the side wall opposite to the drain nozzle.

[0023] By arranging structures such as rubber water seals and maintenance windows on the second drainage pipe, smooth drainage and convenience for subsequent maintenance can be ensured.

[0024] More specifically, the first water receiving tray and the second water receiving tray are rectangular trays, the two water receiving trays are parallel to each other and placed in the front-to-back direction; the first drain pipe and the second drain pipe are respectively connected to opposite side panels of the same water receiving tray.

[0025] Arranging the first and second drainage pipes on opposite side plates of the same water receiving tray can reduce water flow resistance and shorten the water flow path, which is conducive to rapid drainage.

[0026] Preferably, a heat preservation plate is provided between the bottom plate and the evaporator water receiving tray.

[0027] Insulate the space between the water tray and the bottom plate of the air conditioning unit to avoid condensation on the outside of the water tray and reduce water accumulation.

[0028] More specifically, the embedded air-conditioning unit is installed on the top of a rail transit train, and the sealing strip protrudes outward from the bottom plate, dividing the air-conditioning unit installation area on the top of the train into a drainage and water accumulation area and a non-water accumulation area, wherein the drainage and water accumulation area is located on the outside of the sealing strip, and the non-water accumulation area is located on the inside of the sealing strip.

[0029] There is generally no transition between the embedded air-conditioning unit and the carriage, and the unit is directly installed on the top of the passenger compartment area of ​​the train, so the drainage and bottom waterproofing of the embedded air-conditioning are particularly important. The present invention divides the top of the train into a passenger compartment area and a water-accumulating area on the roof through a sealing strip, and uses the drainage holes on the floor located in the water-accumulating area for drainage, so that the passenger compartment area is isolated from the water-accumulating area, eliminating the possibility of water leakage in the passenger compartment area. At the same time, the drainage holes arranged around can also adapt to the inclination of the train body under different road conditions such as uphill, downhill, and turning. No matter what the situation is, there are drainage holes for fast and smooth drainage, thereby improving drainage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the bottom structure of an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the bottom plate of an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the water receiving tray of the evaporator according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic structural diagram of the front portion of the water receiving tray of the evaporator according to an embodiment of the present invention;

[0036] Figure 6 It is a cross-sectional view of a water receiving tray of an evaporator according to an embodiment of the present invention;

[0037] Figure 7 A top view of a second drain pipe of a water receiving tray of an evaporator according to an embodiment of the present invention;

[0038] Figure 8 A side view of a second drain pipe of the evaporator water receiving tray according to an embodiment of the present invention;

[0039] Fig. 9 4 is a cross-sectional view of an evaporation chamber according to an embodiment of the present invention.

[0040] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the accompanying drawings. When describing the embodiments of the present invention in detail, for the convenience of explanation, the drawings showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. It should be noted that the drawings are simplified and all use non-precise scales, which are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0042] like Figure 1 As shown, the embedded air conditioning unit for rail transit trains includes a body shell 100, and a condensation chamber 101, a fresh air chamber 102, and an evaporation chamber 103 are formed inside the unit. The condensation chamber 101, the fresh air chamber 102, and the evaporation chamber 103 are respectively used to place conventional air conditioning components such as condensation fans and condensers, compressors, and evaporators. The chambers are separated by partitions and sealed by sealants. When the train is running on rainy days, rainwater will be collected in the condensation chamber 101, and rainwater entering from the fresh air port 100a along with the fresh air and condensed water generated by the air conditioning unit will also be collected in the fresh air chamber 102. At the same time, there will also be condensed water generated by the evaporator in the evaporation chamber 103. These accumulated water needs to be discharged in time to avoid the risk of leakage caused by excessive accumulation of water.

[0043] Reference Figure 2 and Figure 3 The bottom plate 104 of the air conditioning unit of this embodiment is made of a whole plate by a sheet metal process. The bottom plate 104 has an upwardly bent edge 104a around it, so that the bottom plate 104 forms a water accumulation tray, which can collect rainwater or condensed water entering the air conditioning unit. In other embodiments, the edge can also be formed on the bottom plate by welding or other methods. A sealing strip mounting bracket 104b is also provided on the outer side surface of the bottom plate 104 (the side opposite to the top of the train), and the sealing strip mounting bracket 104b is used to install the sealing strip 201. The sealing strip mounting bracket 104b (sealing strip 201) encloses a ring-shaped closed area. In this embodiment, the closed area is a rectangle, that is, the projection shape of the sealing strip mounting bracket 104b (sealing strip 201) on the bottom plate 104 is a rectangle. The area enclosed by the sealing strip mounting bracket 104b is adapted to the shape of the bottom plate 104, but the area of ​​the area is smaller than the area of ​​the bottom plate 104.

[0044] like Figure 1As shown, when the air conditioning unit is installed on the top of the train, the sealing strip 201 installed at the bottom of the air conditioning unit by the sealing strip mounting bracket 104b divides the air conditioning unit installation area 200 on the top of the train into a drainage and water accumulation area 200A and a non-water accumulation area 200B. The drainage and water accumulation area 200A is located on the outside of the sealing strip 201, and the non-water accumulation area 200B is located on the inside of the sealing strip 201. The passenger compartment area of ​​the train is below the non-water accumulation area 200B. The sealing strip 201 protrudes outward from the bottom plate 104, so that a certain distance is formed between the bottom of the air conditioning unit and the top of the train. The bottom plate of the air conditioning unit adopts a whole plate structural design, which can ensure that the air conditioning unit installation area 200 is a sealed structure to prevent rainwater from leaking from the non-water accumulation area 200B to the passenger compartment area.

[0045] A plurality of drainage holes are processed on the bottom plate 104, and the drainage holes are distributed on the periphery of the sealing strip mounting bracket 104b (sealing strip 201). These drainage holes include a condensation chamber drainage hole 104c, a fresh air chamber drainage hole 104d and an evaporation chamber drainage hole 104e, which are respectively used for drainage of the condensation chamber, the fresh air chamber and the evaporation chamber. The condensation chamber drainage hole 104c is located in the area where the condensation chamber 101 is located and is communicated with the condensation chamber 101. Rainwater and / or condensed water in the condensation chamber 101 can be discharged to the drainage water accumulation area 200A on the top of the train through the condensation chamber drainage hole 104c on the bottom plate 104. Similarly, the fresh air chamber drain hole 104d is located in the area where the fresh air chamber 102 is located, and is communicated with the fresh air chamber 102. The accumulated water in the fresh air chamber 102 is discharged to the drainage and water accumulation area 200A on the top of the train through the fresh air chamber drain hole 104d. The evaporation chamber drain hole 104e is located in the area where the evaporation chamber 103 is located, and is communicated with the evaporator water receiving pan in the evaporation chamber 103. The accumulated water in the evaporator water receiving pan is discharged to the drainage and water accumulation area 200A on the top of the train through the evaporation chamber drain hole 104e.

[0046] When the train is running in rainy or snowy weather conditions, after the rain / snow water enters the air conditioning unit, it is collected on the bottom plate 104. Since there are multiple drainage holes distributed in all directions around the bottom plate 104, when the train is running, whether it is normal running or going uphill or downhill or turning, the accumulated water can be quickly discharged to the drainage water accumulation area 200A on the top of the train through the drainage holes around it, and then discharged centrally through the drainage pipe or drainage trough connected to the drainage water accumulation area. The drainage efficiency is high and no water accumulation will be caused. Furthermore, in order to prevent the negative pressure environment formed by the operation of the fan from causing flying water or poor drainage, water retaining structures such as a water retaining cover plate 105, a water retaining beam 106 or a water retaining cover can also be set at the position of the drainage hole of the bottom plate 104. These water retaining structures can also prevent external foreign objects from clogging the drainage hole. The water retaining structure can adopt the existing design, which is not the focus of the improvement of the present invention and will not be repeated here.

[0047] As a preferred embodiment of the present invention, the evaporator water receiving tray of this embodiment adopts a double (multi) tray structure. The evaporator water receiving tray is arranged in the evaporation chamber, below the evaporator, and is used to receive the condensed water generated by the evaporator. Figure 4 , Figure 5 and Figure 6 The evaporator water receiving tray 300 includes a first water receiving tray 301 and a second water receiving tray 302, and the first water receiving tray 301 and the second water receiving tray 302 are arranged at intervals. The first water receiving tray 301 and the second water receiving tray 302 of this embodiment are both rectangular trays, and the two water receiving trays are arranged at intervals along the width direction of the train, and the water receiving trays extend along the length direction of the train (the front and rear direction of the train), and the two water receiving trays are parallel to each other. The first water receiving tray 301 and the second water receiving tray 302 are connected by a connecting pipe 303, so that when the train body tilts left or right during operation, the water in the water receiving tray at a high position can flow to the water receiving tray at a low position through the connecting pipe 303, so as to prevent the water in the water receiving tray from overflowing due to changes in road conditions. The number of connecting pipes is at least one, preferably two, and more than two can also be used. The setting positions of the connecting pipes can be determined according to their number. In this embodiment, two connecting pipes 303 are used to connect the first water receiving tray 301 and the second water receiving tray 302. The connecting pipes 303 are respectively located at the front and rear of the water receiving trays.

[0048] The structure of the first water receiving tray 301 is the same as that of the second water receiving tray 302. The structure of a single water receiving tray is described below by taking the first water receiving tray as an example. Drain holes (not shown) are provided at the front and rear of the first water receiving tray 301, and drain pipes for draining water outward are connected to the drain holes. The drain pipes of this embodiment include a first drain 304 and a second drain pipe 305, wherein the first drain pipe 304 is connected to the drain hole at the front of the first water receiving tray 301, and the first drain pipe 304 is connected to the condensate collection pipe (not shown) on the train; the second drain pipe 305 is connected to the drain hole at the rear of the first water receiving tray 301, and the second drain pipe 305 is connected to the evaporation chamber drain hole 104e on the bottom plate 104. By placing the condensation drainage pipe inside, the risk of condensation that is easy to occur when the evaporator condensate drainage pipe is set outside in the prior art can be avoided. Further preferably, a sinking trough 301a is provided at the bottom of the first water receiving pan 301. The sinking trough 301a is located on the outside of the first water receiving pan 301 and is of the same length as the first water receiving pan 301. By providing the sinking trough 301a, the water storage capacity of a single water receiving pan under left-right inclined road conditions can be increased to the maximum extent, thereby preventing water in the water receiving pan from overflowing. Further preferably, the drainage hole of the water receiving pan is provided at the location of the sinking trough 301a, that is, the first and second drainage pipes are connected to the sinking trough. After the water is collected in the sinking trough 301a, it is discharged to the outside through the drainage hole through the first drainage pipe 304 and / or the second drainage pipe 305. Furthermore, a water retaining plate 301-1 is provided above the sinking trough 301a, and a maintenance port 301-1a ( Figure 5 ).

[0049] The structures of the first drain pipe 304 and the second drain pipe 305 can be the same or different, and can be set accordingly according to the installation space inside the air conditioning unit. In this embodiment, the structures of the first drain pipe 304 and the second drain pipe 305 are different. The first drain pipe 304 is a short circular pipe, and the second drain pipe 305 is a long square pipe. The first drain pipe 304 is directly connected to the water receiving tray, and the second drain pipe 305 is connected to the drain hole at the rear of the water receiving tray through a short pipe 306. The second drain pipe 305 has a certain water storage capacity. Figure 7 and Figure 8 As shown, a drain nozzle 307 is provided at the bottom of the other end of the second drain pipe 305. In order to prevent water from flying and offset the negative pressure of the fan, a rubber water seal 308 can be provided at the drain nozzle 307 so that the condensed water can be discharged smoothly. A maintenance window 305a is provided on the wall of the second drain pipe 305. The maintenance window 305a is located above the rubber water seal 308 (drain nozzle 307), that is, located on the side wall opposite to the drain nozzle. The blockage of the drain nozzle can be checked and eliminated through the maintenance window 305a, which is convenient for maintenance.

[0050] When the train is on an uphill road, the second drain pipe 305 is at a low position relative to the first and second water receiving pans, and the condensed water in the first and second water receiving pans enters the second drain pipe 305 through the drain holes, and then is discharged to the drainage water accumulation area 200A on the top of the train through the second drain pipe 305 and the evaporation chamber drain holes 104e; when the train is on a downhill road, the first drain pipe 304 is at a low position relative to the first and second water receiving pans, and the condensed water in the first and second water receiving pans enters the first drain pipe 304 through the drain holes, and then is collected through the first drain pipe 304 and the condensed water collection pipe of the train for use by the train body.

[0051] As another preferred embodiment of the present invention, Fig. 9 As shown, a heat preservation plate 107 is arranged between the bottom plate 104 of the air conditioning unit and the evaporator water receiving tray 300. Since the surface temperature of the evaporator is relatively low when it is working, condensed water will be generated when it contacts with the air, so that the plate body of the evaporator water receiving tray 300 is also prone to condensed water. The heat preservation plate 107 arranged between the bottom plate 104 of the air conditioning unit and the evaporator water receiving tray 300 has a heat preservation function, which can prevent the generation of condensed water to a certain extent.

[0052] Of course, the technical concept of the present invention is not limited to the above-mentioned embodiments, and many different specific schemes can be obtained based on the concept of the present invention. For example, in the above-mentioned embodiments, the first and second drain pipes of the water receiving tray are respectively connected to the front side plate and the rear side plate of the water receiving tray, but can also be connected to the front and rear of the left and right side plates of the water receiving tray, as long as the first and second drain pipes (two drainage positions) are respectively located at the two opposite ends of the water receiving tray, that is, as long as the opposite ends of the water receiving tray are connected to the drain pipes; the connecting pipe and the drain pipe can be a straight pipe or a curved pipe, which can be flexibly arranged according to needs; in addition, the front and rear in the embodiments are also relative concepts. When the reference system for defining the direction changes, the names of the front and rear in the embodiments can also change accordingly, such as the left side, the right side, etc.; such changes and equivalent transformations should be included in the scope of the present invention.

Claims

1. An embedded air conditioning unit, comprising a housing, wherein the housing has a condensation chamber, a fresh air chamber and an evaporation chamber, wherein the evaporation chamber is provided with an evaporator water receiving pan located below the evaporator; a bottom plate is provided at the lower part of the housing, characterized in that: The bottom plate has an upwardly bent edge around it, and a sealing strip mounting bracket is provided on the outer side of the bottom plate, and the sealing strip mounting bracket is used to install the sealing strip, and the sealing strip encloses a closed annular area, and the area of ​​the annular area is smaller than the area of ​​the bottom plate; The bottom plate is provided with a plurality of drainage holes, and the drainage holes are distributed on the outside of the sealing strip; The evaporator water receiving pan includes a first water receiving pan, a second water receiving pan and a drain pipe, the first water receiving pan and the second water receiving pan are arranged at intervals and are connected to each other through at least one connecting pipe; the drain pipes are respectively arranged at opposite ends of the first water receiving pan, and the drain pipes are respectively arranged at opposite ends of the second water receiving pan; the drain pipes include a first drain pipe and a second drain pipe, the first drain pipe is connected to the front of the first water receiving pan and the second water receiving pan, and extends to the outside of the embedded air-conditioning unit and is connected to the condensed water collection pipe, the second drain pipe is connected to the rear of the first water receiving pan and the second water receiving pan, and is connected to the evaporation chamber drain hole on the bottom plate.

2. The embedded air conditioning unit according to claim 1, characterized in that: The sealing strip protrudes outward from the bottom plate, dividing the air-conditioning unit installation area below the embedded air-conditioning unit into a drainage and water accumulation area and a non-water accumulation area, wherein the drainage and water accumulation area is located on the outside of the sealing strip, and the non-water accumulation area is located on the inside of the sealing strip.

3. The embedded air conditioning unit according to claim 1 or 2, characterized in that: The bottom plate is made of a whole sheet of sheet metal.

4. The embedded air conditioning unit according to claim 1, characterized in that: The drainage holes include a condensation chamber drainage hole, a fresh air chamber drainage hole and an evaporation chamber drainage hole. The condensation chamber drainage hole is located in the area where the condensation chamber is located and is communicated with the condensation chamber; the fresh air chamber drainage hole is located in the area where the fresh air chamber is located and is communicated with the fresh air chamber; the evaporation chamber drainage hole is communicated with the evaporator water receiving pan located in the evaporation chamber.

5. The embedded air conditioning unit according to claim 1 or 4, characterized in that: The drainage hole is provided with a water retaining cover plate and / or a water retaining beam and / or a water retaining cover.

6. The embedded air conditioning unit according to claim 1, characterized in that: The first water receiving tray and the second water receiving tray are provided with sinking grooves, the sinking grooves are located outside the water receiving trays and are of the same length as the water receiving trays, and the drainage pipe is communicated with the sinking grooves.

7. The embedded air conditioning unit according to claim 1, characterized in that: The second drain pipe is a square pipe, and the second drain pipe is connected to the water receiving tray through a short pipe. A drain nozzle is arranged at the bottom of the other end of the second drain pipe.

8. The embedded air conditioning unit according to claim 7, characterized in that: A rubber water seal is arranged at the drainage nozzle.

9. The embedded air conditioning unit according to claim 7, characterized in that: A maintenance window is arranged on the pipe wall of the second drain pipe, and the maintenance window is located on the side wall opposite to the drain nozzle.

10. The embedded air conditioning unit according to claim 1, characterized in that: The first water receiving tray and the second water receiving tray are rectangular trays, the two water receiving trays are parallel to each other and placed in the front-to-back direction; the first drain pipe and the second drain pipe are respectively connected to the opposite side plates of the same water receiving tray.

11. The embedded air conditioning unit according to claim 1, characterized in that: A heat preservation plate is arranged between the bottom plate and the evaporator water receiving tray.

12. The embedded air conditioning unit according to claim 1, characterized in that: The embedded air-conditioning unit is installed on the top of a rail transit train, and the sealing strip protrudes outward from the bottom plate, dividing the air-conditioning unit installation area on the top of the train into a drainage and water accumulation area and a non-water accumulation area, wherein the drainage and water accumulation area is located on the outside of the sealing strip, and the non-water accumulation area is located on the inside of the sealing strip.

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