A drainage structure for preventing condensate backflow in the air conditioner of a rail vehicle

Abstract

The present invention discloses a drainage structure for preventing condensate backflow in an air conditioner of a rail vehicle, which is arranged on the bottom plate of the air conditioner and includes: an evaporation chamber drainage groove, a fresh air chamber drainage groove, a water diversion nozzle, a water collection cover and a connecting pipe. The bottom plate is divided into a top surface and a bottom surface, and the top surface faces the inside of the air conditioner chamber. The openings of the evaporation chamber drainage groove and the fresh air chamber drainage groove both face the bottom surface and are fixed on the bottom surface. The inlet of the connecting pipe communicates with the outlet of the fresh air chamber drainage groove and extends into the inside of the evaporation chamber drainage groove, and its outlet is arranged inside the outlet of the evaporation chamber drainage groove. The water diversion nozzle is fixed on the bottom plate and is provided with a through stepped hole, and the variable diameter part thereof is a transition surface. One end of the large hole of the stepped hole away from the transition surface is the water inlet of the water diversion nozzle, and the other end of the stepped hole is the water outlet of the water diversion nozzle. The water inlet of the water diversion nozzle is flush with the top surface, and the outlet is arranged in the fresh air chamber drainage groove. The water collection cover is fixed above the water diversion nozzle, and a water inlet is opened at the bottom end of one side wall. It overcomes the problem that the existing drainage structure cannot meet the discharge of condensate water on the premise of collecting and discharging in the fresh air chamber and the evaporation chamber.

Description

Technical Field

[0001] The present invention relates to the field of rail vehicle air conditioners, and particularly to a drainage structure for preventing condensate backflow in a rail vehicle air conditioner. Background Art

[0002] During the refrigeration process of a rail vehicle air conditioner, the condensate precipitated on the surface of the evaporator directly enters the evaporation chamber drainage trough through the evaporation chamber drainage mechanism. When the fresh air volume is large and the rail vehicle is in a heavy rain, a certain amount of rainwater will be inhaled into the fresh air chamber. The negative pressure in the evaporation chamber is relatively large, resulting in a relatively large negative pressure in the fresh air chamber connected to the evaporation chamber. Therefore, the condensate and rainwater must be discharged separately. Otherwise, under the influence of the air pressure difference, all the condensate will be sucked back into the fresh air chamber.

[0003] Different from household air conditioners, the weight and space of rail vehicle air conditioners are strictly limited. Currently, some exported rail vehicle air conditioners require the centralized drainage of the fresh air chamber and the evaporation chamber. If a common drainage pipe is directly used for the evaporation chamber and the fresh air chamber, the negative pressure will prevent the condensate of the air conditioner from being discharged, resulting in all the condensate being sucked back into the fresh air chamber. Even under the action of the external air flow, splashing will occur. The condensate will enter the interior of the carriage through the air outlet and the air duct under the action of the fan, which will not only affect the comfort of the interior environment of the carriage, but also have an impact on the electrical equipment inside the vehicle. Summary of the Invention

[0004] The present invention provides a drainage structure for preventing condensate backflow in a rail vehicle air conditioner to overcome the problem that the existing drainage structure cannot meet the discharge of condensate under the premise of centralized drainage of the fresh air chamber and the evaporation chamber.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A drainage structure for preventing condensate backflow in a rail vehicle air conditioner is provided on the bottom plate of the air conditioner, and includes: an evaporation chamber drainage trough, a fresh air chamber drainage trough, a water diversion nozzle, a water collection cover and a connecting pipe. The bottom plate is divided into a top surface and a bottom surface, and the top surface faces the interior of the air conditioner chamber;

[0007] The openings of the evaporation chamber drainage trough and the fresh air chamber drainage trough both face the bottom surface. The evaporation chamber drainage trough and the fresh air chamber drainage trough are fixed on the bottom surface. The inlet of the connecting pipe communicates with the outlet of the fresh air chamber drainage trough, and the connecting pipe extends into the interior of the evaporation chamber drainage trough. The outlet of the connecting pipe is arranged inside the outlet of the evaporation chamber drainage trough;

[0008] The water diversion nozzle is fixed on the bottom plate. The water diversion nozzle is provided with a through stepped hole. The variable diameter part of the stepped hole is a transition surface. One end of the large hole of the stepped hole away from the transition surface is the inlet of the water diversion nozzle, and the other end of the stepped hole is the outlet of the water diversion nozzle. The inlet of the water diversion nozzle is flush with the top surface, and the outlet of the water diversion nozzle is arranged in the fresh air chamber drainage trough;

[0009] The water collecting cover is fixed above the water diversion nozzle, and a water inlet is arranged at the bottom end of one side wall of the water collecting cover.

[0010] Further, the connecting pipe is composed of a horizontal pipe, an arc elbow and an outlet pipe connected in sequence. The horizontal pipe communicates with the outlet of the drainage trough of the fresh air cavity. The horizontal pipe extends into the drainage trough of the evaporation cavity, and the outlet pipe is arranged inside the outlet of the drainage trough of the evaporation cavity.

[0011] Further, the arc elbow is a 90-degree elbow.

[0012] Further, a protective pipe is arranged at the bottom of the drainage trough of the evaporation cavity. The protective pipe is the outlet of the drainage trough of the evaporation cavity, and the outlet pipe is arranged inside the protective pipe.

[0013] Further, the outlet of the water diversion nozzle is far from the outlet of the drainage trough of the fresh air cavity.

[0014] Further, a semi-circular baffle is arranged at the outlet of the water diversion nozzle.

[0015] Further, a rubber plug is further included, and a hole for installing the rubber plug is arranged at the top end of the water collecting cover.

[0016] Advantages of the present invention:

[0017] After condensed water is precipitated on the surface of the evaporator of the air conditioner, it directly enters the drainage trough of the evaporation cavity through the drainage mechanism of the evaporation cavity of the air conditioner and is discharged from the outlet of the drainage trough of the evaporation cavity; when the rainfall is small, the rainwater entering the fresh air cavity will not form ponding on the bottom plate and will naturally evaporate. When the rainfall is large, the rainwater entering the fresh air cavity will form ponding on the bottom plate. The rainwater flows into the water collecting cover from the water inlet of the water collecting cover, enters the drainage trough of the fresh air cavity from the water diversion nozzle, then flows through the connecting pipe from the drainage trough of the fresh air cavity, and finally is discharged from the outlet of the connecting pipe arranged inside the outlet of the drainage trough of the evaporation cavity;

[0018] The outlet of the connecting pipe communicates with the outside atmosphere, forming an air pressure difference with the fresh air cavity with negative pressure, which hinders the discharge of rainwater in the fresh air cavity. The stepped hole arranged in the water diversion nozzle can, on the one hand, cooperate with the water collecting cover to store a certain amount of rainwater and accumulate a certain liquid level to resist the air pressure difference by increasing the water pressure so that the rainwater can flow into the drainage trough of the fresh air cavity. On the other hand, since the air pressure difference will form an air flow flowing backward into the fresh air cavity, the small holes of the stepped hole can increase the resistance of the air flow upward, thereby preventing the rainwater accumulated in the water collecting cover from being blown and splashed;

[0019] When the rainwater stored in the water collecting cover and the stepped hole is not enough to resist the air pressure difference, the reverse air flow formed by the air pressure difference will blow and splash the ponding. At this time, the water collecting cover above the water diversion nozzle can play a blocking role to prevent the rainwater from splashing in the fresh air cavity;

[0020] The present invention enables rainwater and condensate to enter from the fresh air chamber and the evaporation chamber respectively and be discharged from the same position, meeting the requirements of water collection and drainage for the fresh air chamber and the evaporation chamber, and enabling smooth drainage by reducing the obstruction to drainage caused by the air pressure difference. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 The front view of a drainage structure for preventing condensate backflow in an air conditioner of a rail vehicle disclosed by the present invention, provided on the bottom plate;

[0023] Figure 2 For Figure 1 The partial enlarged view at C of

[0024] Figure 3 The structural schematic diagram of the water diversion nozzle of a drainage structure for preventing condensate backflow in an air conditioner of a rail vehicle disclosed by the present invention;

[0025] Figure 4 The top view of a drainage structure for preventing condensate backflow in an air conditioner of a rail vehicle disclosed by the present invention, provided on the bottom plate;

[0026] Figure 5 The structural schematic of a drainage structure for preventing condensate backflow in an air conditioner of a rail vehicle disclosed by the present invention Figure 1 ;

[0027] Figure 6 The structural schematic of a drainage structure for preventing condensate backflow in an air conditioner of a rail vehicle disclosed by the present invention Figure 2 ;

[0028] Figure 7 For Figure 5 The sectional view taken along the line D-D of

[0029] Figure 8 The structural schematic of the water collecting cover of a drainage structure for preventing condensate backflow in an air conditioner of a rail vehicle disclosed by the present invention Figure 2 ;

[0030] In the figure: 1. Drainage trough of evaporation chamber, 1-1. Inlet of drainage trough of evaporation chamber, 1-2. Protection pipe, 2. Drainage trough of fresh air chamber, 2-1. Outlet of drainage trough of fresh air chamber, 3. Water diversion nozzle, 3-1. Step hole, 3-2. Semi-circular baffle, 4. Water collection cover, 4-1. Water inlet, 4-2. Rubber plug, 5. Connecting pipe, 5-1. Horizontal section, 5-2. Arc elbow, 5-3. Outlet section, A. Bottom plate. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] This embodiment provides a drainage structure for preventing condensate backflow in an air conditioner of a rail vehicle. As Figures 1 to 8 shown, it is arranged on the bottom plate A of the air conditioner and includes: a drainage trough 1 of the evaporation chamber, a drainage trough 2 of the fresh air chamber, a water diversion nozzle 3, a water collection cover 4 and a connecting pipe 5. The bottom plate A is divided into a top surface and a bottom surface, and the top surface faces the inside of the air conditioner chamber;

[0033] The openings of the drainage trough 1 of the evaporation chamber and the drainage trough 2 of the fresh air chamber both face the bottom surface. The drainage trough 1 of the evaporation chamber and the drainage trough 2 of the fresh air chamber are fixed on the bottom surface. The inlet of the connecting pipe 5 communicates with the outlet 2-1 of the drainage trough of the fresh air chamber. The connecting pipe 5 extends into the interior of the drainage trough 1 of the evaporation chamber, and the outlet of the connecting pipe 5 is arranged inside the outlet of the drainage trough 1 of the evaporation chamber;

[0034] In this embodiment, the drainage trough 1 of the evaporation chamber and the drainage trough 2 of the fresh air chamber are welded to the bottom surface, and the circumferential welds are coated with sealant to ensure sealing;

[0035] The water diversion nozzle 3 is fixed on the bottom plate A. As Figure 2 shown, the water diversion nozzle 3 is provided with a through step hole 3-1. The variable diameter part of the step hole 3-1 is a transition surface. One end of the large hole of the step hole 3-1 far from the transition surface is the inlet of the water diversion nozzle 3, and the other end of the step hole 3-1 is the outlet of the water diversion nozzle 3. The inlet of the water diversion nozzle 3 is flush with the top surface, and the outlet of the water diversion nozzle 3 is arranged inside the drainage trough 2 of the fresh air chamber;

[0036] The water collection cover 4 is fixed above the water diversion nozzle 3. As Figure 8 shown, an inlet 4-1 is opened at the bottom end of one side wall of the water collection cover 4;

[0037] The air conditioner is provided with a drainage mechanism for the evaporation chamber. The pipeline on the drainage mechanism for the evaporation chamber is connected to as Figure 4It is connected to the inlet 1-1 of the drainage trough of the evaporation chamber. The condensed water enters the evaporation chamber drainage trough 1 through the evaporation chamber drainage mechanism and is discharged from the outlet of the evaporation chamber drainage trough;

[0038] When the rainfall is small, the rainwater entering the fresh air chamber will not accumulate water on the bottom plate A and will naturally evaporate. When the rainfall is large, the rainwater entering the fresh air chamber will accumulate water on the bottom plate A. The rainwater flows into the water collecting cover 4 from the water inlet 4-1 of the water collecting cover, enters the fresh air chamber drainage trough 2 from the water diversion nozzle 3, then flows through the connecting pipe 5 from the fresh air chamber drainage trough 2, and finally is discharged from the outlet of the connecting pipe 5 provided in the outlet of the evaporation chamber drainage trough 1, enabling the rainwater and the condensed water to enter from the fresh air chamber and the evaporation chamber respectively and be discharged from the same position, meeting the requirements of the collection and drainage of the fresh air chamber and the evaporation chamber;

[0039] The outlet of the connecting pipe 5 is connected to the outside atmosphere, forming an air pressure difference with the fresh air chamber with negative pressure, which hinders the discharge of the rainwater in the fresh air chamber. The stepped hole 3-1 provided in the water diversion nozzle 3 can, on the one hand, cooperate with the water collecting cover 4 to store a certain amount of rainwater and accumulate a certain liquid level to resist the air pressure difference by increasing the water pressure so that the rainwater can flow into the fresh air chamber drainage trough. On the other hand, since the air pressure difference will form an air flow flowing back into the fresh air chamber, the small holes of the stepped hole 3-1 can increase the resistance of the air flow upward, thereby preventing the rainwater accumulated in the water collecting cover 4 from being blown and splashed;

[0040] When the rainwater stored in the water collecting cover 4 and the stepped hole 3-1 is not enough to resist the air pressure difference, the air flow flowing back formed by the air pressure difference will blow and splash the accumulated water. At this time, the water collecting cover 4 above the water diversion nozzle can play a blocking role to prevent the rainwater from splashing in the fresh air chamber.

[0041] In a specific embodiment, as Figure 7 shown, the connecting pipe 5 is composed of a horizontal pipe 5-1, an arc elbow 5-2 and an outlet pipe 5-3 connected in sequence. The horizontal pipe 5-1 is connected to the outlet 2-1 of the fresh air chamber drainage trough. The horizontal pipe 5-1 extends into the evaporation chamber drainage trough 1, and the outlet pipe 5-3 is provided in the outlet of the evaporation chamber drainage trough 1;

[0042] During the rainwater discharge process, the relationship between the air pressure difference and the water pressure of the rainwater in the connecting pipe 5 is in dynamic change. When the amount of rainwater flowing into the fresh air chamber drainage trough 2 is large, at this time the air pressure difference is less than the water pressure of the rainwater in the connecting pipe 5, and the rainwater can be discharged smoothly;

[0043] When the amount of rainwater flowing into the fresh air chamber drainage trough 2 is small, at this time the air pressure difference is greater than the water pressure of the rainwater in the connecting pipe 5, and the difference between the two is small. Under the combined action of the air pressure difference and the water pressure of the rainwater in the connecting pipe 5, a liquid seal will be formed at the arc elbow 5-2 to hinder the reverse flow of the rainwater;

[0044] When the amount of rainwater flowing into the drainage trough 2 of the fresh air chamber is not enough to fill the connecting pipe 5, the rainwater will flow back under the influence of the air pressure difference. However, due to the small amount of rainwater and the blockage of the water collecting cover 4, it will not affect the fresh air chamber.

[0045] In a specific embodiment, the arc elbow 5-2 is a 90-degree elbow, and the 90-degree elbow can better play a liquid sealing role.

[0046] In a specific embodiment, as Figure 7 shown, a protective pipe 1-2 is provided at the bottom of the evaporation chamber drainage trough 1. The protective pipe 1-2 is the outlet of the evaporation chamber drainage trough 1, and the outlet pipe 5-3 is arranged in the protective pipe 1-2. The protective pipe 1-2 can protect the internal outlet pipe 5-3.

[0047] In a specific embodiment, the outlet of the water diversion nozzle 3 is far from the outlet of the fresh air chamber drainage trough 2 to prevent the reverse-flowing air from directly impacting the outlet of the water diversion nozzle 3.

[0048] In a specific embodiment, as Figure 3 shown, a semi-circular baffle 3-2 is provided at the outlet of the water diversion nozzle 3, which can increase the upward resistance of the reverse-flowing air by reducing the area through which the air can pass.

[0049] In a specific embodiment, as Figure 2 shown, it further includes a rubber plug 4-2. A hole for installing the rubber plug 4-2 is provided at the top of the water collecting cover 4. Since the water diversion nozzle 3 needs to pass through rainwater, during long-term use, the sediment in the rainwater will block the step hole 3-1. Therefore, a hole is opened at the top of the water collecting cover 4 above the water diversion nozzle 3 to facilitate maintenance personnel to clean, and it is blocked by the rubber plug 4-2.

[0050] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drainage structure for preventing condensate backflow in an air conditioner of a rail vehicle, which is arranged on the bottom plate (A) of the air conditioner, and is characterized in that, Comprising: An evaporation chamber drain trough (1), a fresh air chamber drain trough (2), a water diversion nozzle (3), a water collection cover (4) and a connecting pipe (5). The bottom plate (A) is divided into a top surface and a bottom surface, and the top surface faces towards the air-conditioning chamber; The openings of the evaporation chamber drain trough (1) and the fresh air chamber drain trough (2) both face the bottom surface. The evaporation chamber drain trough (1) and the fresh air chamber drain trough (2) are fixed on the bottom surface. The inlet of the connecting pipe (5) communicates with the outlet of the fresh air chamber drain trough (2), the connecting pipe (5) extends into the interior of the evaporation chamber drain trough (1), and the outlet of the connecting pipe (5) is arranged inside the outlet of the evaporation chamber drain trough (1); The water diversion nozzle (3) is fixed on the bottom plate (A). The water diversion nozzle (3) is provided with a through stepped hole (3-1). The variable diameter part of the stepped hole (3-1) is a transition surface. One end of the large hole of the stepped hole (3-1) away from the transition surface is the inlet of the water diversion nozzle (3), and the other end of the stepped hole (3-1) is the outlet of the water diversion nozzle (3). The inlet of the water diversion nozzle (3) is flush with the top surface. The outlet of the water diversion nozzle (3) is arranged inside the fresh air chamber drain trough (2). The outlet of the water diversion nozzle (3) is far from the outlet of the fresh air chamber drain trough (2). The outlet of the water diversion nozzle (3) is provided with a semi-circular baffle (3-2); The water collection cover (4) is fixed above the water diversion nozzle (3). An inlet (4-1) is opened at the bottom end of one side wall of the water collection cover (4).

2. The drainage structure for preventing condensate backflow of an air conditioner for rail vehicles according to claim 1, characterized in that, The connecting pipe (5) is composed of a horizontal pipe (5-1), an arc elbow (5-2) and an outlet pipe (5-3) connected in sequence. The horizontal pipe (5-1) communicates with the outlet of the fresh air chamber drain trough (2). The horizontal pipe (5-1) extends into the interior of the evaporation chamber drain trough (1). The outlet pipe (5-3) is arranged inside the outlet of the evaporation chamber drain trough (1).

3. The drainage structure for preventing condensate backflow of an air conditioner for rail vehicles according to claim 2, characterized in that, The arc elbow (5-2) is a 90-degree elbow.

4. The drainage structure for preventing condensate backflow of an air conditioner for rail vehicles according to claim 2, wherein A protective pipe (1-2) is arranged at the bottom of the evaporation chamber drain trough (1). The protective pipe (1-2) is the outlet of the evaporation chamber drain trough (1). The outlet pipe (5-3) is arranged inside the protective pipe (1-2).

5. The drainage structure for preventing condensate backflow of an air conditioner for rail vehicles according to claim 1, characterized in that, Also included is a rubber plug (4-2). A hole for installing the rubber plug (4-2) is provided at the top end of the water collection cover (4).

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