Fresh air and return air balanced design track air conditioning unit

Abstract

The utility model relates to a fresh air and return air balance design track air conditioning unit, which comprises an evaporation cavity and a condensation cavity, two evaporators are arranged in the evaporation cavity, a mixing area is arranged between the two evaporators, a return air inlet and a fresh air inlet are respectively arranged on a shell on two sides of the mixing area, and the return air inlet and the fresh air inlet are communicated with the condensation cavity. A drainage plate is installed between the fresh air opening and the return air opening and guides return air and fresh air into the mixing area from the return air flowing channel and the fresh air flowing channel respectively. Return air and fresh air are divided into two independent paths to flow before entering a mixing area, and the flow resistance of the air inlet sides of the evaporators close to the fresh air port and the return air port is increased, so that the purpose of effectively adjusting the ratio of the fresh air to the return air of the evaporators on the two sides is achieved, and the ratio of the fresh air to the return air of the evaporators on the two sides is balanced; the deviation can be effectively controlled within + / -5%, the total air volume is not affected, and the air supply temperatures of the two sides of the air conditioning unit are uniform.

Description

Technical Field

[0001] The utility model relates to the field of air conditioning equipment technology, in particular to a track air conditioning unit with a new return air balance design. Background Art

[0002] Currently, each carriage in domestic rail vehicles is equipped with two independent air conditioning units. Each unit consists of an evaporation chamber and a condensation chamber. The evaporation chamber houses the evaporator, blower, throttling element, and connecting piping, while the condensation chamber houses the condenser, compressor, condenser fan, and connecting piping. To improve the air quality within the carriage, a fresh air vent is typically installed on the evaporation chamber housing of the air conditioning unit to introduce fresh air from outside. The vent is typically located on the side wall of the housing.

[0003] Traditional air-conditioning units generally have two sets of evaporators and blowers installed in the evaporation chamber, and the two sets of evaporators and blowers are symmetrically installed in the shell. A return air inlet is provided on the bottom plate of the shell between the two evaporators, and a fresh air inlet is provided on the side panel of the shell. After the fresh air enters the shell from the fresh air inlets on both sides, it is mixed with the indoor return air entering from the return air inlet. The mixed air exchanges heat with the evaporator. The air after heat exchange is sent to the interior of the car through the air inlet under the action of the blower to adjust the temperature and humidity of the environment in the car.

[0004] When the fresh air and return air enter the shell from the fresh air inlet and return air inlet, the fresh air and return air will flow toward the evaporator on the side with smaller resistance. This will cause the ratio of fresh air and return air entering the two evaporators to be unbalanced, making the supply air temperature on both sides uneven. Utility Model Content

[0005] The main technical problem solved by the utility model is to provide a track air-conditioning unit with a new return air balance design which has a simple structure, low cost and can effectively adjust the new and return air ratios of the evaporators on both sides so as to balance the new and return air ratios of the evaporators on both sides.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] A track air-conditioning unit with a new return air balance design includes an evaporation chamber and a condensation chamber. Two evaporators are installed in the evaporation chamber. A mixing area is formed between the two evaporators. Return air inlets and fresh air inlets are respectively provided on the shells on both sides of the mixing area. A guide plate is installed between the fresh air inlet and the return air inlet. The guide plate introduces return air and fresh air into the mixing area from the return air flow channel and the fresh air flow channel respectively.

[0008] Furthermore, the return air inlet and the fresh air inlet are correspondingly arranged on the bottom plate and the side plate of the shell on one side of the mixing area, the evaporator is extended along the width direction of the shell, the return air inlet is arranged between the two evaporators and extends along the length direction of the shell, and the center line of the return air inlet coincides with the symmetrical center line of the two evaporators.

[0009] Furthermore, the guide plate is an inverted L-shape, including a vertical edge and a horizontal edge. The bottom end of the vertical edge is connected to the bottom plate of the shell between the fresh air inlet and the return air inlet. The horizontal edge is placed above the return air inlet and at least partially covers the return air inlet. The guide plate guides the fresh air to flow into the mixing area from above the guide plate, and guides the return air to flow into the mixing area from below the guide plate.

[0010] Furthermore, the horizontal side of the guide plate covers 40%-70% of the length of the return air outlet.

[0011] Furthermore, the horizontal side of the guide plate covers 50% of the length of the return air outlet.

[0012] Furthermore, the height of the space below the horizontal side of the guide plate accounts for 60-80% of the total height of the evaporation chamber.

[0013] Furthermore, the height of the space below the horizontal side of the guide plate accounts for 70% of the total height of the evaporation chamber.

[0014] Furthermore, both sides of the vertical sides of the guide plate are sealedly connected to the side plates of the shell and the partitions that surround the evaporator air supply chamber.

[0015] Furthermore, the vertical edge of the guide plate is installed between the fresh air inlet and the return air inlet on a side close to the fresh air inlet.

[0016] Furthermore, an electric cavity box is installed above the mixing area, and the installation height of the horizontal side of the guide plate is lower than the lower surface of the electric control box.

[0017] In summary, the new return air balance design rail air conditioning unit provided by the present invention has the following advantages compared with the prior art:

[0018] (1) The utility model installs a guide plate between the return air inlet and the fresh air inlet, so that the return air and the fresh air are divided into two independent flow paths before entering the mixing area, and increases the flow resistance on the air inlet side of the evaporator near the fresh air inlet and the return air inlet, thereby achieving the purpose of effectively adjusting the ratio of fresh and return air of the evaporators on both sides, making the ratio of fresh and return air of the evaporators on both sides balanced, and the deviation can be effectively controlled within ±5%, which not only does not affect the total air volume, but also makes the supply air temperature on both sides of the air-conditioning unit uniform.

[0019] (2) The present invention solves the problem of uneven mixing of fresh air and return air between the evaporators on both sides in the current standardized subway unified solution through a simple structure.

[0020] (3) The utility model has a simple structure and can be modified based on the original air-conditioning unit structure. The modification cost is low and the structure of the original air-conditioning unit will not be affected.

[0021] (4) The utility model sets the guide plate on one side of the fresh air inlet, that is, on the path where the fresh air flows from the fresh air inlet to the mixing area, which is beneficial to further block rainwater from the fresh air.

[0022] The specific implementation of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are part of this utility model and are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0024] In the attached figure:

[0025] Figure 1 This is a schematic diagram of the evaporation chamber structure of the utility model air conditioning unit Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the evaporation chamber structure of the utility model air conditioning unit Figure 2 .

[0027] In the picture:

[0028] Shell 1, bottom plate 11, side plate 12, evaporator 2, blower 3, fresh air inlet 4, return air inlet 5, guide plate 6, vertical edge 61, horizontal edge 62, evaporator air supply cavity 7, partition 8, electrical cavity box 9.

[0029] It should be noted that the drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0033] like Figure 1 and Figure 2 As shown, the utility model provides a new return air balance design rail air-conditioning unit, including a shell 1, which is divided into an evaporation chamber and a condensation chamber by a partition. Two evaporators 2 and two sets of blowers 3 are installed in the evaporation chamber, and a compressor, a condenser, a condensing fan (not shown in the figure), etc. are installed in the condensing chamber.

[0034] The two evaporators 2 are extended along the width direction of the shell 1, and the blower 3 is correspondingly installed on the exhaust side of the evaporator 2. The space between the two evaporators 2 is a mixing area, and the mixing area is located on the air inlet side of the evaporator 2. A fresh air inlet 4 and a return air inlet 5 are respectively provided on the shell 1 on both sides of the mixing area. Specifically, the return air inlet 5 is opened on the bottom plate 11 of the shell 1 and is opened at a position close to the side plate 12. The fresh air inlet 4 is opened on the side plate 12 on the side of the return air inlet 5. Fresh air enters the shell 1 from the fresh air inlets 4 on both sides, and return air enters the shell 1 from the return air inlets 5 on both sides. The return air inlet 5 is set between the two evaporators 2 and extends along the length direction of the shell 1. The center line of the return air inlet 5 coincides with the symmetrical center line of the two evaporators 2, which is conducive to ensuring uniform air supply to the evaporators 2 on both sides.

[0035] In this embodiment, a guide plate 6 is installed between the fresh air inlet 4 and the return air inlet 5. The guide plate 6 is configured to guide the return air and fresh air from the return air flow channel and the fresh air flow channel, respectively, into the mixing area between them. The guide plate 6 separates the fresh air flow path from the return air flow path before they enter the mixing area.

[0036] With this structure, fresh air and return air flow into the mixing area between the two evaporators 2 through two relatively isolated, independent flow channels, respectively. This increases the flow resistance on the inlet side of the evaporator 2 near the fresh air inlet 4 and return air inlet 5, effectively adjusting the fresh air to return air ratio between the two evaporators and balancing the fresh air to return air ratio between the two evaporators 2. According to CFD simulation analysis, the design of the guide plate 6 effectively controls the deviation of the fresh air to return air ratio between the two evaporators 2 to within ±5%, ensuring uniform supply air temperature on both sides of the air conditioning unit. Furthermore, the placement of the guide plate 6 in the fresh air flow path further helps to block rainwater from the fresh air.

[0037] In this embodiment, it is further preferred that the guide plate 6 adopts an inverted L-shaped structure, including a vertical edge 61 and a horizontal edge 62. The vertical edge 61 is connected to the shell bottom plate 11 between the fresh air inlet 4 and the return air inlet 5, and the horizontal edge 62 is placed above the return air inlet 5 and covers at least part of the return air inlet 5. The guide plate 6 guides the fresh air to flow from above the horizontal edge 62 into the mixing area between the two evaporators 2, and the return air flows from below the horizontal edge 62 into the mixing area. The space above the horizontal edge 62 serves as a fresh air flow channel, and the space below the horizontal edge 62 serves as a return air flow channel.

[0038] The structure of the above-mentioned guide plate 6 is adopted to increase the flow resistance of the fresh air and return air after entering the shell 1, extend the flow path of the fresh air and return air, and prevent the fresh air and return air from directly flowing into the evaporator 2 on the side with less resistance (the evaporator on the right side of the figure), so that the ratio of fresh and return air in the two evaporators 2 is balanced.

[0039] In this embodiment, it is further preferred that the horizontal edge 62 of the guide plate 6 covers 40%-70% of the length of the return air inlet 5, and the optimal value is to cover 50% of the length of the return air inlet 5. This can adjust the flow resistance of the fresh air and return air into the two evaporators 2 without affecting the air volume of the return air and the air volume of the fresh air.

[0040] In this embodiment, it is further preferred that the height of the space below the horizontal edge 62 of the guide plate 6 accounts for 60-80% of the total height of the evaporation chamber. The horizontal edge 62 divides the height of the evaporation chamber into two sections, the lower section of which accounts for 60-80% of the total height, with the optimal lower section accounting for 70% of the total height. This allows for adjusting the flow resistance of fresh air and return air into both evaporators 2 using a simple structure.

[0041] In this embodiment, it is further preferred that both sides of the vertical edge 61 of the guide plate 6 are sealedly connected to the side panels 12 of the air conditioning unit housing 1 and the partition 8 surrounding the evaporator air supply chamber 7, and the vertical edge 61 of the guide plate 6 is installed between the fresh air inlet 4 and the return air inlet 5, on the side close to the fresh air inlet 4. This helps to ensure the return air volume while not affecting the fresh air volume.

[0042] In this embodiment, the electrical chamber box 9 is installed above the mixing area. This allows the cooler return air and fresh air to cool the electrical chamber box 9, thereby extending the service life of the electrical components within the electrical chamber box 9. The horizontal edge 62 of the guide plate 6 is lower than the bottom surface of the electrical chamber box 9, ensuring sufficient fresh air volume without increasing the fresh air velocity.

[0043] The above solution has the following beneficial effects:

[0044] 1. By installing a guide plate 6 between the return air inlet 5 and the fresh air inlet 4, the return air and the fresh air are divided into two independent flow paths before entering the mixing area, and the flow resistance on the air inlet side of the evaporator 2 close to the fresh air inlet 4 and the return air inlet 5 is increased, thereby achieving the purpose of effectively adjusting the fresh and return air ratio of the evaporators 2 on both sides, making the fresh and return air ratio of the evaporators 2 on both sides balanced, and the deviation can be effectively controlled within ±5%, which not only does not affect the total air volume, but also makes the supply air temperature on both sides of the air-conditioning unit uniform.

[0045] 2. Through a simple structure, it solves the problem of uneven mixing of fresh air and return air on both sides of the evaporator in the current standardized subway unified solution.

[0046] 3. The structure is simple and can be modified on the basis of the original air-conditioning unit structure. The modification cost is low and will not affect the structure of the original air-conditioning unit.

[0047] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments with equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A new return air balance design rail air conditioning unit, including an evaporation chamber and a condensation chamber, characterized by: Two evaporators are installed in the evaporation chamber, and a mixing area is formed between the two evaporators. Return air inlets and fresh air inlets are respectively provided on the shells on both sides of the mixing area. A guide plate is installed between the fresh air inlet and the return air inlet. The guide plate introduces return air and fresh air into the mixing area from the return air flow channel and the fresh air flow channel respectively.

2. The new return air balance design rail air conditioning unit according to claim 1 is characterized by: The return air inlet and the fresh air inlet are correspondingly arranged on the bottom plate and the side plate of the shell on one side of the mixing area. The evaporator is extended along the width direction of the shell. The return air inlet is arranged between the two evaporators and extends along the length direction of the shell. The center line of the return air inlet coincides with the symmetrical center line of the two evaporators.

3. The new return air balance design rail air conditioning unit according to claim 1 or 2 is characterized in that: The guide plate is in an inverted L-shape, including a vertical edge and a horizontal edge. The bottom end of the vertical edge is connected to the bottom plate of the shell between the fresh air inlet and the return air inlet. The horizontal edge is placed above the return air inlet and at least partially covers the return air inlet. The guide plate guides the fresh air to flow into the mixing area from above the guide plate, and guides the return air to flow into the mixing area from below the guide plate.

4. The new return air balance design rail air conditioning unit according to claim 3 is characterized by: The horizontal side of the guide plate covers 40%-70% of the length of the return air outlet.

5. The new return air balance design rail air conditioning unit according to claim 4 is characterized in that: The horizontal side of the guide plate covers 50% of the length of the return air outlet.

6. The new return air balance design rail air conditioning unit according to claim 3 is characterized by: The height of the space below the horizontal side of the guide plate accounts for 60-80% of the total height of the evaporation chamber.

7. The new return air balance design rail air conditioning unit according to claim 6 is characterized by: The height of the space below the horizontal side of the guide plate accounts for 70% of the total height of the evaporation chamber.

8. The rail air conditioning unit with a new return air balance design according to claim 3 is characterized by: Both sides of the vertical side of the guide plate are respectively sealed with the side plates of the shell and the partition plates that surround the evaporator air supply chamber.

9. The rail air conditioning unit with a new return air balance design according to claim 3 is characterized by: The vertical edge of the guide plate is installed between the fresh air inlet and the return air inlet on a side close to the fresh air inlet.

10. The rail air conditioning unit with a new return air balance design according to claim 3 is characterized by: An electric cavity box is installed above the mixing area, and the installation height of the horizontal side of the guide plate is lower than the lower surface of the electric cavity box.

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