CN102126504A - Drainage structure of rail vehicle air conditioning unit - Google Patents

Abstract

The invention discloses a drainage structure for an air-conditioning unit of a rail vehicle, which includes a drainage pan arranged on the bottom plate of the air-conditioning unit, and is characterized in that it also includes a first-stage water seal structure and a second-stage water seal structure, and the first-stage water seal structure The sealing structure includes a cover set on the drain pan of the air conditioner unit, the bottom of the cover has several gaps, the gaps form a water inlet channel with the bottom of the drain pan, and a bypass channel is opened in the middle of the cover. The second-stage water seal structure is a variable-section drainage pipe, and the opening of the variable-section drainage pipe is located at the bottom of the drainage pan inside the cover. The invention requires a small installation space, is sufficient to overcome the negative pressure of the air-conditioning unit, has a water sealing function, and is not easy to be blocked by mud and dust.

Description

Drainage structure of rail vehicle air conditioning unit

technical field

The invention belongs to the field of air conditioners for rail vehicles, and in particular relates to a drainage structure for an air conditioner unit for rail vehicles.

Background technique

At present, in terms of household air conditioners (such as window-type, split-type air-conditioning units) and commercial air-conditioners (such as cabinet-type, ceiling-type, roof-type, and multi-system air-conditioning units), since the air-conditioning units directly supply air to the room, the static pressure of the blower It is very small, and the negative pressure of the corresponding discharge condensate is also small. Moreover, the installation of the air conditioner is static, and there is no need to consider the movement and shaking of the condensed water. Therefore, the height of the baffle plate required for the water receiving pan is very low, and the discharge of the condensed water of the air conditioning unit is quite easy. The location is open, and it can be led out of the room through a hose. In terms of industrial air conditioners, such as cabinet machines, the air is sent to the room through the air duct. The static pressure of the blower is relatively high, and the negative pressure of the corresponding discharge condensate is also relatively large. But its space size is not limited, and usually the air outlet and evaporator are arranged up and down, the condensed water will not be taken out of the unit by the air supply, and its drainage structure is also very simple.

Rail vehicle air conditioner is a special air conditioning system specially used for railway passenger trains. It is very different from ordinary commercial and civilian air conditioners, and has the following characteristics:

(1) The vehicle air conditioner is installed on a moving rail vehicle and is in a state of high-speed motion and vibration shock.

(2) To adapt to the environment of wind, rain, sun, ice and snow.

(3) When the vehicle air-conditioning unit is in cooling operation, it will produce a large amount of condensed water, which needs to be discharged out of the unit in time, otherwise it will enter the compartment through the air outlet and air duct, affecting passengers and endangering the safety of electrical equipment in the vehicle.

(4) The weight and space of the vehicle air-conditioning unit are strictly limited, and the height of the condensate water receiving tray is limited. The air-conditioning unit needs to supply air to the vehicle, and the air supply resistance is about 150-250Pa. The negative pressure at the drain outlet of the condensate water tray reaches about 300-400Pa, making drainage very difficult.

(5) The train needs to run on a track with a maximum gradient of 30‰. As the train goes uphill and downhill, the water level of the drain outlet of the vehicle air conditioner unit is also changing, which is obviously different from ordinary commercial and civilian air conditioners.

In addition, the vibration and impact are relatively large during train operation, the air-conditioning system must be installed firmly, and a shock-absorbing device must be installed, and the joints of the refrigeration pipeline must be tight and reliable to prevent leakage. When selecting materials, care was taken to keep the weight of the train as low as possible. In addition, the material must have good flame retardant properties to ensure safety.

There are two main types of drainage structures for air conditioning in existing rail vehicles:

One is to adopt centralized drainage, and the drainage pipe is drawn from the water receiving tray, and the drainage pipe is connected with the drainage pipe provided on the vehicle, and a water seal is arranged on the vehicle drainage pipe. Its disadvantages are: (1) The installation of the drain pipe and the water seal need to occupy a large space of the vehicle; (2) When a fault occurs, it is difficult to distinguish whether the responsibility for the poor discharge of air-conditioning condensate is the installation problem of the air-conditioning manufacturer or the vehicle manufacturer. Therefore, vehicle manufacturers generally do not agree to adopt this structure, and it can only be applied to trunk railway passenger cars with sufficient space.

Another structure is that the water in the water receiving tray of the air conditioning unit is directly discharged to the water collecting tray on the top of the vehicle through the drain outlet, and then discharged to the track under the vehicle through the water pipe. Its disadvantages are: (1) Since the height of the water receiving tray in the unit is very low, and the negative pressure of the drain is very large, it is necessary to set a large sealing compartment and a labyrinth structure at the drain to overcome the negative pressure, so that the The condensed water in the water tray is smoothly discharged to the water collecting tray on the top of the vehicle; (2) There is a great hidden danger in the structure. When the dust in the air passes through the evaporator, it is wetted into mud and enters the water tray, and is driven by the drainage. In the sealed interlayer and labyrinth structure, it is easy to deposit in this structure, and eventually lead to drainage blockage; (3) due to the complex structure of the labyrinth, it is very difficult to clean up after the blockage.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a drainage structure that requires a small installation space, is sufficient to overcome the negative pressure of the air-conditioning unit, has a water sealing function, and is not easily blocked by mud and dust.

For reaching above-mentioned purpose, the present invention adopts following technical scheme:

The drainage structure of the rail vehicle air-conditioning unit includes a drainage pan arranged on the bottom plate of the air-conditioning unit, and also includes a first-stage water seal structure and a second-stage water seal structure. The first-stage water seal structure includes a cover arranged on the air-conditioner unit The cover on the drain pan, the bottom of the cover has several gaps, the gap and the bottom of the drain pan form a water inlet channel, a bypass channel is opened in the middle of the cover, and the second-stage water seal structure is a The variable section drain pipe, the opening of the variable section drain pipe is located at the bottom of the drain pan inside the cover body.

Further, there is a blocking block inside the inlet of the variable-section drainage pipe, and the blocking block makes the inlet of the variable-section drainage pipe gradually smaller.

Further, the longitudinal section of the blocking block is a right triangle.

Further, a sealing area is connected to the outlet of the variable-section drain pipe, and the sealing area is located between the bottom plate of the air-conditioning unit and the roof mounting plate of the rail vehicle.

Further, a roof drain pipe is connected to the bottom of the sealing area.

Preferably, the cover is a hollow cuboid.

Preferably, the cover body is fixed on the drain pan by bolts.

The invention has the following beneficial effects: (1) the required installation space is small enough to overcome the negative pressure of the air-conditioning unit, has a water sealing function, and is not easy to be blocked by mud and dust; (2) if a fault of mud and dust is blocked, it is easy to clean and dredge; 3) Smooth drainage, high reliability, easy maintenance and cleaning, and low maintenance costs, which can meet the requirements of higher and higher vehicle speeds, stricter size requirements for vehicle air-conditioning units, and smaller and smaller installation spaces for the drainage structure of air-conditioning units Require.

Description of drawings

Fig. 1 is a perspective view of the present invention;

Fig. 2 is a sectional view of the present invention;

Fig. 3 is a schematic diagram of the internal structure of the first-stage water seal structure and the second-stage water seal structure of the present invention.

Detailed ways

The drainage structure of the rail vehicle air-conditioning unit according to the present invention adopts the principle of two-stage water seal, and the first-stage water seal structure utilizes the principle of bypass to change the flow direction of the air through the change of the height of condensed water, and finally form a water seal. Thereby overcoming the air negative pressure, the condensed water can smoothly enter the water seal of the variable cross-section drainage pipe of the second stage. The second-stage water seal structure is to use variable cross-section drainage pipes to facilitate the formation of water seals through the principle of decreasing wind speed and dynamic pressure. The water seal structure has a small appearance. In order to facilitate the cleaning and maintenance work, the first-stage water seal structure is detachable, and the water seal structure can be disassembled and assembled by simple bare-hand operation, and the cleaning and maintenance only need simple cleaning of sundries and mud.

The key technology that the present invention needs to solve is:

(1) The convenience of disassembly and assembly of the first-level water seal structure;

(2) Calculation and determination of the bypass area of the first stage water seal;

(3) Determination of the diameter of the variable section drainage pipe of the second stage water seal;

(4) The slope of the variable section of the second-stage water seal determines the plugging area of the end face of the drain pipe;

The innovation point of the present invention is to adopt a double-stage water seal. The first-stage water seal uses the bypass principle to determine a suitable bypass area through calculation, and uses the change in the height of condensed water to change the flow direction of the air to reach a suitable height. Water seal, so as to overcome the air negative pressure, so that the condensed water smoothly enters the water seal of the second-stage variable cross-section drain pipe. The second level of water seal is to use variable section drainage pipes, calculate the diameter of the drainage pipe and the sealing area of the end face of the drainage pipe according to the required displacement, and use the principle of decreasing wind speed and dynamic pressure to calculate and determine the variable section of the drainage pipe The slope is convenient for the formation of the water seal, so that the condensed water can be discharged from the air conditioning unit smoothly.

In order to further understand and recognize the structure, features and effects of the present invention, a preferred embodiment is now given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

As shown in Figures 1-3, the rail vehicle air-conditioning unit drainage structure 1 according to the present invention includes a drainage pan 4 arranged on the bottom plate 6 of the air-conditioning unit, and also includes a first-stage water seal structure 2 and a second-stage water seal structure 3. The first-stage water seal structure 2 includes a cover 21 covering the drain pan 4 of the air conditioner unit. The bottom of the cover has several gaps, and the gap forms a water inlet with the bottom 41 of the drain pan 4. Channel 22, a bypass channel 23 is opened in the middle of the cover body, and the second-stage water seal structure 3 is a drainage pipe with variable cross-section. There is a blocking block 31 inside the inlet of the variable-section drainage pipe, and the blocking block makes the inlet of the variable-section drainage pipe gradually smaller. The longitudinal section of the blocking block 31 is a right triangle. Preferably, the cover body 21 is a hollow cuboid, which is fixed on the drain pan 4 by bolts.

As shown in Figures 1-3, a sealing area 7 is connected to the outlet of the variable cross-section drain pipe, and the sealing area 7 is located between the bottom plate 6 of the air conditioning unit and the roof mounting plate 5 of the rail vehicle. A roof drain pipe 8 is connected to the bottom of the sealing area 7 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Those who are familiar with this technology, using the principles and technical characteristics of the present invention, make various changes and decorations, all should be Covered within the scope of protection defined in the claims.

Claims (7)

1. The drainage structure of the rail vehicle air-conditioning unit, including a drainage pan located on the bottom plate of the air-conditioning unit, is characterized in that it also includes a first-level water seal structure and a second-level water seal structure, and the first-level water seal structure includes a Covering the cover on the drain pan of the air conditioner unit, the bottom of the cover has several gaps, and the gap forms a water inlet channel with the bottom of the drain pan, and a bypass channel is opened in the middle of the cover. The level water seal structure is a variable section drainage pipe, and the opening of the variable section drainage pipe is located at the bottom of the drainage pan inside the cover body. 2. The drainage structure of the rail vehicle air-conditioning unit according to claim 1, characterized in that, there is a blocking block inside the inlet of the variable-section drainage pipe, and the blocking block makes the inlet of the variable-section drainage pipe gradually smaller. 3. The drainage structure of the rail vehicle air-conditioning unit according to claim 1, wherein the longitudinal section of the blocking block is a right triangle. 4. The drainage structure of the rail vehicle air-conditioning unit according to claim 1, wherein a sealing area is connected to the outlet of the variable-section drainage pipe, and the sealing area is located between the bottom plate of the air-conditioning unit and the roof of the rail vehicle between mounting plates. 5. The drainage structure of the rail vehicle air-conditioning unit according to claim 1, wherein a roof drainage pipe is connected to the bottom of the sealing area. 6. The drainage structure of the rail vehicle air-conditioning unit according to claim 1, wherein the cover body is a hollow cuboid. 7. The drainage structure of the rail vehicle air-conditioning unit according to claim 1, wherein the cover body is fixed on the drainage pan by bolts.

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