CN109017846A - One kind being used for railway vehicle air conditioner system variable cross-section air channel structure - Google Patents

Abstract

The invention belongs to air-conditioning system fields, and in particular to one kind is used for railway vehicle air conditioner system variable cross-section air channel structure, two variable cross-section air ducts including the setting that is centrosymmetric；Variable cross-section air duct includes interconnected side wall wind channel, main air duct and branch air duct；One end of main air duct is open end, and the other end is closed end, and main air duct is variable section structure, and the cross section of specifically main air duct is gradually become smaller from open end to closed end；Main air duct is equipped with the first air inlet on the bottom surface along length direction, and the bottom surface along length direction is main air duct towards the one side inside railway carriage；One end of side wall wind channel is equipped with air inlet, and the other end is connected to the open end of main air duct；One end of branch air duct is open end, and the other end is closed end；The open end of branch air duct is connected to side wall wind channel, and branch air duct is equipped with the second air inlet on the bottom surface along length direction.Static pressure is uniform in the application realization air duct, and balanced ventilation.

Description

A variable cross-section air duct structure for rail vehicle air conditioning system

technical field

The invention belongs to the field of air-conditioning systems, and in particular relates to a variable-section air duct structure for rail vehicle air-conditioning systems.

Background technique

In order to ensure that the temperature difference in each area of the rail transit vehicle does not exceed ±3°C, the design and application of the air duct in the rail transit vehicle is extremely important. The design of the air duct needs to ensure that all areas in the cabin have air supply, and at the same time, the air volume of each air outlet is uniform.

At present, most of the air ducts in the rail vehicles adopt the long type, that is, the air duct runs through the whole car, and the cross section of the air duct does not change. The static pressure in the air duct is locally increased by adding baffles in the air duct to make the wind blow out from the nearby air outlet. Although this method also undergoes accurate wind field calculation, this method additionally increases the weight of the air duct and also increases the resistance in the air duct.

Contents of the invention

The invention provides a variable cross-section air duct for rail vehicle air-conditioning systems, which realizes uniform static pressure in the air duct and uniform air supply.

In order to achieve the above-mentioned technical purpose, the technical solution adopted by the present invention is, a variable-section air duct structure for rail vehicle air-conditioning system, including two variable-section air ducts arranged symmetrically in the center; the variable-section air duct includes interconnected Side wall air duct, main air duct and branch air duct; one end of the main air duct is an open end, the other end is a closed end, the main air duct is a variable cross-section structure, specifically the cross section of the main air duct is closed from the open end to The end gradually becomes smaller; the main air duct is provided with a first air outlet on the bottom surface along its own length direction, and the main air duct faces the inner side of the rail vehicle compartment on the bottom surface along its own length direction; one end of the side wall air guide duct is provided with The other end of the air inlet is connected to the open end of the main air duct; one end of the branch air duct is the open end, and the other end is the closed end; the open end of the branch air duct is connected to the side wall air duct and is located At one end connected with the main air duct, the branch air duct is provided with a second air outlet on the bottom surface along its length direction.

Preferably, the bottom surface of the main air duct along its own length direction and the top surface along its own length direction form an included angle of 1-3°.

Preferably, the bottom surface of the main air duct along its own length direction and the top surface along its own length direction form an included angle of 2°.

Preferably, the first air outlet is arranged along the centerline of the bottom surface in the length direction of the main air duct.

Preferably, there are two branch air ducts, and the two branch air ducts are arranged side by side; the open ends of the two branch air ducts are connected to the side wall air guide channel, and are located at the end where the side wall air guide channel communicates with the main air duct.

Beneficial effect

The variable-section air duct design of rail vehicle air-conditioning system is based on the principle of ensuring that the wind speed in the air duct is equal, that is, the constant velocity method. The cross-section design intentionally reduces the passing section of the air duct to make the wind speed in the air duct equal and ensure the dynamic pressure to be equal. Equal dynamic pressure also ensures the static pressure of the air duct to be equal, so as to achieve the purpose of uniform air supply. This time, the new invention adopts the variable cross-section air duct type, so that the dynamic pressure of the air in the main air duct can be uniformly converted into static pressure with the change of the air duct interface, so as to ensure the uniform static pressure of the entire section of the air duct, thereby ensuring the entire section The uniformity of air supply in the air duct; at the same time, it can reduce the air outlet speed of each air outlet, thereby reducing the noise of the air outlet.

The variable cross-section air duct design of the air-conditioning system of the rail vehicle invented this time can ensure the uniformity of the air supply in the air duct in the rail car, and ensure that all areas in the vehicle have a uniform air supply, thereby ensuring that the temperature difference in each area in the compartment does not exceed ±3°C, improving the comfort in the cabin.

Description of drawings

Fig. 1 is a schematic diagram of a variable-section air duct structure for rail vehicle air-conditioning systems of the present application;

The top view of Fig. 2 variable section air duct structure;

The bottom view of Fig. 3 variable section air duct structure;

The structural schematic diagram of Fig. 4 main air duct;

Fig. 5 is a schematic cross-sectional view of two main air ducts in a variable cross-section air duct structure;

In the figure, 1. The first air inlet; 2. The second air inlet; 3. The first side wall air duct; 4. The second side wall air duct; 5. The first main air duct; 6. The second main air duct 7. The first air duct; 8. The second air duct; 9. The third air outlet; 10. The fourth air outlet; 11. The first air outlet; 12. The second air outlet; 13. Car Light installation department.

Detailed ways

In order to make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figure 1, a variable-section air duct structure used for rail vehicle air-conditioning systems includes two variable-section air ducts arranged symmetrically in the center; One end of the main air duct is an open end, the other end is a closed end, and the main air duct is a variable cross-section structure, specifically, the cross section of the main air duct gradually becomes smaller from the open end to the closed end; the main air duct A first air outlet is provided on the bottom surface along its own length direction, and the main air duct faces the inner side of the rail vehicle compartment on the bottom surface along its own length direction; one end of the side wall air guide duct is provided with an air inlet, and the other end is connected to the main air duct. The open end of the air duct; one end of the branch air duct is the open end, and the other end is the closed end; the open end of the branch air duct is connected to the side wall air duct, and is located at the end where the side wall air duct communicates with the main air duct, The branch air duct is provided with a second air outlet on the bottom surface along its length direction. There are two branch air ducts, and the two branch air ducts are arranged side by side; the open ends of the two branch air ducts are connected to the side wall air duct, and are located at the end where the side wall air duct communicates with the main air duct.

As shown in Figure 2-3 in detail, one of the variable cross-section air ducts includes the first side wall leading air duct 3, the first main air duct 5 and the first branch air duct 7 which are connected to each other; the first main air duct 5 One end is an open end, the other end is a closed end, the first air duct is a variable cross-section structure, specifically the cross section of the first main air duct 5 gradually becomes smaller from the open end to the closed end; The bottom surface in the length direction is provided with a first air outlet 11, and the bottom surface along its own length direction is the side of the first main air duct 5 facing the interior of the rail vehicle compartment; the first main air duct 5 is arranged along the centerline of the bottom surface in its own length direction; One end of the first side wall air duct 3 is provided with a first air inlet 1, and the other end is connected to the opening end of the first main air duct 5; one end of the first branch air duct 7 is an open end, and the other end is a closed end; The opening end of the first branch air channel 7 communicates with the first side wall air guide channel 3, and is located at the end where the first side wall air guide channel 3 communicates with the first main air channel 5, and the first branch air channel 7 is along its own A second air outlet 12 is provided on the bottom surface in the length direction.

As an improved technical solution of the present invention, the bottom surface of the first main air duct 5 along its own length direction and the top surface along its own length direction form an included angle of 1-3°, preferably, the first main air duct 5 along its own length direction The bottom surface forms an included angle of 2° with the top surface along its own length direction. It can also be understood as the included angle α between the bottom surface of the first main air duct 5 along its own length direction along its own width direction. As shown in FIG. 4 , α is 88°.

There are two first air ducts 7, and the open ends of the two first air ducts 7 are connected side by side to the first side wall air guide channel 3, and are located at the end where the first side wall air guide channel communicates with the first main air duct .

Another variable-section air duct includes a second side wall air duct 4, a second main air duct 6, and a second branch air duct 8 that communicate with each other; one end of the second main air duct 6 is an open end, and the other end is a closed end. , the second main air duct is a variable section structure, specifically the cross section of the second main air duct 6 gradually becomes smaller from the open end to the closed end; the second main air duct 6 is provided with a third The air outlet 9, the bottom surface along the length direction of itself is the side of the second main air duct 6 towards the interior of the rail vehicle compartment; the third air outlet 9 is arranged along the centerline of the bottom surface of the second main air duct 6 in the length direction; the second side wall leads One end of the air duct 4 is provided with a second air inlet 2, and the other end is connected to the opening end of the second main air duct 6; one end of the second air duct 8 is an open end, and the other end is a closed end; the second air duct The open end of 8 communicates with the second side wall air guide channel 4, and is located at the end where the second side wall air guide channel 4 communicates with the second main air channel 6, and the second branch air channel 8 is on the bottom surface along its own length direction A fourth air outlet 10 is provided. There are two second branch air passages 8, and the open ends of the two second branch air passages 8 are connected side by side to the second side wall air guide channel 4, and are located at the point where the second side wall air guide channel 4 communicates with the second main air channel. one end.

In order to ensure the comfort of passengers in the carriages, rail transit also has extremely high requirements for the noise in the carriages.

During practical application, since the air-conditioning unit is suspended and installed under the car, the air supply first passes through the side wall air duct to guide the air-supply of the air-conditioning unit from under the car to the main air duct on the roof. The vehicle is equipped with 2 air-conditioning units, which supply air to the interior of the vehicle from the corresponding two side wall air ducts. The side (bottom surface of the main air duct) facing the interior of the main air duct is indented to form a lamp mounting portion 13 .

Specifically, the wind blows out from the blower of the air conditioning unit and enters the side wall air duct, and enters the main air duct, which is a process in which the dynamic pressure gradually changes to the static pressure. Since the first side wall air duct and the second side wall air duct are centrally symmetrically arranged, the wind can enter along the side wall of the compartment; Internal ventilation.

The main air duct of the present application adopts a variable cross-section air duct, and the top surface of the main air duct is parallel to the top of the compartment, that is, a plane; the bottom surface of the main air duct is an inclined plane. Compared with the equal-section air duct of the prior art, when the air duct structure of the present application is ventilating, the wind speed gradually decreases in the air duct, the dynamic pressure gradually decreases, and the static pressure gradually increases, causing The greater the static pressure, the greater the air volume, which affects the uniformity of the air supply, which has advantages.

The variable-section air duct of the present application is established on the basis of fluid mechanics. According to the Bernoulli equation, when the air flows in the air duct, its total wind pressure can be divided into three parts: static pressure, dynamic pressure and resistance loss. The structure of the main air duct adopts a variable cross-section design. Due to the short length of the rail transit vehicle and the smooth inner surface of the air duct, all resistance losses are negligible to ensure the uniformity of the main air duct to the interior of the vehicle. In order to ensure that the static pressure of each point in the entire section of the air duct is the same and the air supply is uniform, the dynamic pressure in the entire section of the air duct is guaranteed to be equal, and the equal dynamic pressure means the equal wind speed.

As shown in Figure 4, the main air duct gradually narrows in the width direction, and the interface gradually becomes smaller. When the passing air volume decreases, the passing interface is reduced to maintain the wind speed.

The above is only the embodiment of the present invention, and its description is relatively specific and detailed, but it should not be construed as limiting the patent scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (5)

1. one kind is used for railway vehicle air conditioner system variable cross-section air channel structure, which is characterized in that including the setting that is centrosymmetric Two variable cross-section air ducts；Variable cross-section air duct includes interconnected side wall wind channel, main air duct and branch air duct；The one of main air duct End is open end, and the other end is closed end, and main air duct is variable section structure, and specifically the cross section of main air duct is from open end to envelope Closed end gradually becomes smaller；Main air duct is equipped with the first air outlet on the bottom surface along length direction, along the bottom in length direction Face is main air duct towards the one side inside railway carriage；One end of side wall wind channel is equipped with air inlet, and the other end is connected to The open end of main air duct；One end of branch air duct is open end, and the other end is closed end；The open end of branch air duct is connected to side wall and draws Air duct, and be located at one end for being connected to main air duct of side wall wind channel, branch air duct is on the bottom surface along length direction equipped with the Two air outlets.

2. according to claim 1 a kind of for railway vehicle air conditioner system variable cross-section air channel structure, which is characterized in that Bottom surface of the main air duct along length direction is in 1-3 ° of angle with the top surface along length direction.

3. according to claim 1 or 2 a kind of for railway vehicle air conditioner system variable cross-section air channel structure, feature exists It is in 2 ° of angle with the top surface along length direction in, bottom surface of the main air duct along length direction.

4. according to claim 1 a kind of for railway vehicle air conditioner system variable cross-section air channel structure, which is characterized in that Center line of first air outlet along main air duct length direction bottom surface is arranged.

5. according to claim 1 a kind of for railway vehicle air conditioner system variable cross-section air channel structure, which is characterized in that There are two branch air ducts, and two branch air ducts are arranged side by side, and the open end of two branch air ducts is connected to side wall wind channel, and is located at side One end that wall wind channel is connected to main air duct.