Cooling structure of exhaust emission cooling subcooler

Abstract

The utility model discloses a cooling structure of an exhaust emission cooling subcooler, which belongs to the technical field of bus air conditioners and comprises a shell, an evaporation fan, an evaporator, an air return grid and a subcooler. The subcooler is arranged on the first partition plate and communicates with the compression cavity. The evaporator is provided with a third partition plate, an air return cavity is formed in the inner side of the evaporator, the air return grid is communicated with an air taking pipe, and the other end of the air taking pipe is communicated with the subcooler. A mounting plate, a condenser and a condensation fan are arranged in the air exhaust cavity, the condenser and the condensation fan are arranged on the mounting plate, an air exhaust pipe is arranged on the second partition plate, and the two ends of the air exhaust pipe are communicated with the compression cavity and the air exhaust cavity of the condenser respectively. The air conditioning system can increase the supply of fresh air, obviously increase the refrigerating capacity and the energy efficiency ratio of the air conditioning system, and improve the energy-saving benefit.

Description

Technical Field

[0001] The utility model relates to the technical field of bus air conditioners, and particularly relates to a cooling structure of an exhaust gas emission cooling subcooler. Background Art

[0002] In order to meet the necessary oxygen demand of passengers in the bus cabin, the bus air conditioning system needs to be provided with a fresh air system to supply a certain amount of fresh air outside the vehicle into the cabin (the fresh air volume per person is about 18 m³ / h). At present, the fresh air of the bus air conditioner enters the fresh air naturally through the fresh air door opening to the return air cavity of the air conditioner evaporator. The dirty air in the cabin is discharged to the outside of the vehicle through the gaps between the doors and windows of the cabin, and the cabin has a slight positive pressure. However, due to the improvement of the current vehicle manufacturing level, the gaps between the vehicle doors and windows are getting smaller and smaller (some vehicles are fully enclosed fixed windows), and it has become more and more difficult to discharge the exhaust gas through the gaps between the doors and windows, resulting in a problem of insufficient fresh air supply in the fresh air supply and exhaust gas discharge structure. Moreover, the cold energy taken away during the exhaust gas discharge in the cabin is not utilized, causing energy loss, low cooling capacity and energy efficiency ratio of the air conditioning system, and poor energy-saving effect. Summary of the Utility Model

[0003] The main purpose of the utility model is to solve the above-mentioned existing technical problems to a certain extent, and propose a cooling structure of an exhaust gas emission cooling subcooler, which can increase the supply of fresh air volume, and significantly increase the cooling capacity and energy efficiency ratio of the air conditioning system, and improve the energy-saving benefit.

[0004] The above problems to be solved by the utility model are realized through the following technical solutions:

[0005] A cooling structure of an exhaust gas emission cooling subcooler is proposed, which includes a housing, an evaporation fan, an evaporator, a return air grille and a subcooler. The housing is divided into a supply air chamber, a compression chamber and an exhaust air chamber by a first partition plate and a second partition plate arranged therein. The subcooler is arranged on the first partition plate, and its air outlet is communicated with the compression chamber. The evaporation fan and the evaporator are arranged in the supply air chamber. A third partition plate is provided at the end of the evaporator close to the first partition plate, and a return air chamber is formed inside it. The return air grille is arranged in the return air chamber. The air duct interface of the return air grille is communicated with a taken air duct arranged. The other end of the taken air duct passes through the third partition plate and is communicated with the air inlet of the subcooler. An installation plate, a condenser and a condensation fan are arranged in the exhaust air chamber. The condenser and the condensation fan are arranged on the installation plate. An exhaust air duct is provided on the second partition plate, and both ends of the exhaust air duct are respectively communicated with the compression chamber and the exhaust air chamber of the condenser.

[0006] In some embodiments, a fresh air inlet is communicated between the housing and the return air chamber.

[0007] In some embodiments, the air intake duct is tightly sealed with the duct interface and the air inlet of the subcooler by a clamp provided therebetween.

[0008] In some embodiments, the subcooler is hermetically assembled in the first installation groove provided on the first partition board, and the exhaust duct is hermetically assembled in the second installation groove provided on the second partition board.

[0009] In some embodiments, the first installation groove is provided at the middle position of the first partition board, and the second installation groove is provided at the edge position of the second partition board, so that the subcooler and the exhaust duct are arranged staggeredly left and right.

[0010] In some embodiments, a plurality of evaporation blowers are provided and fixed to the housing by bolts.

[0011] In some embodiments, the return air grille is arranged in the return air cavity along the length direction of the housing.

[0012] The above technical solution provided by the present application has the following advantages compared with the prior art:

[0013] In the present utility model, the air intake duct is communicated with the duct interface of the return air grille, so that a part of relatively low-temperature dirty air in the bus compartment enters the subcooler through the air intake duct, then enters the compression chamber from the subcooler, and finally is drawn into the exhaust air cavity of the condenser by the condensation blower through the exhaust duct and discharged to the atmosphere through the condensation blower, thereby increasing the channel opening for exhaust gas emission in the compartment and further increasing the supply of fresh air in the compartment;

[0014] Furthermore, the high-pressure liquid refrigerant in the subcooler is cooled and then throttled and depressurized by the expansion valve and enters the evaporator for refrigeration, so that the supercooling temperature of the high-pressure liquid refrigerant in the refrigeration system can be increased, the flashing steam during the throttling of the expansion valve can be significantly reduced, the liquid temperature when the refrigerant enters the evaporator can also be reduced, the heat transfer temperature difference at the inlet section of the evaporator is increased, the refrigeration capacity and energy efficiency ratio of the air-conditioning system are significantly increased, and the energy-saving benefit is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model 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 following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0016] Figure 1 It is a structural diagram of the cooling structure of the exhaust gas emission cooling subcooler of the present utility model;

[0017] Figure 2This is a partially enlarged view of the cooling structure of the practical exhaust gas emission cooling subcooler.

[0018] Explanation of the reference numerals in the attached drawings:

[0019] 1 - Housing; 2 - Evaporation fan; 3 - Evaporator; 4 - Return air grille; 5 - Subcooler; 6 - First partition; 7 - Second partition; 8 - Air supply chamber; 9 - Compression chamber; 10 - Exhaust chamber; 11 - Third partition; 12 - Return air chamber; 13 - Fresh air inlet; 14 - Air duct interface; 15 - Air extraction duct; 16 - Mounting plate; 17 - Condenser; 18 - Condensing fan; 19 - Exhaust duct. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0021] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0023] As Figure 1-2As shown in the figure, the present utility model proposes a cooling structure for an exhaust gas emission cooling subcooler, which includes a housing 1, an evaporation fan 2, an evaporator 3, a return air grille 4 and a subcooler 5. The housing 1 is divided into a supply air chamber 8, a compression chamber 9 and an exhaust air chamber 10 by a first partition 6 and a second partition 7 provided therein. The subcooler 5 is hermetically assembled in a first installation groove provided in the first partition 6, and its air outlet is communicated with the compression chamber 9. The evaporation fan 2 and the evaporator 3 are arranged in the supply air chamber 8. Among them, there are multiple evaporation fans 2, which are fixed on the housing 1 by bolts. A third partition 11 is provided at the end of the evaporator 3 close to the first partition 6, and a return air chamber 12 is formed inside it. A fresh air inlet 13 is provided on the housing 1 and communicated with the return air chamber 12. The return air grille 4 is arranged in the return air chamber 12 along the length direction of the housing 1. The air duct interface 14 of the return air grille 4 is communicated with a provided air extraction duct 15. The other end of the air extraction duct 15 passes through the third partition 11 and is communicated with the air inlet of the subcooler 5. The connection between the air extraction duct 15 and the air duct interface 14 and the connection between the air extraction duct 15 and the air inlet of the subcooler 5 are hermetically clamped by a provided clamp. An installation plate 16, a condenser 17 and a condensation fan 18 are provided in the exhaust air chamber 10. The condenser 17 and the condensation fan 18 are arranged on the installation plate 16. An exhaust duct 19 is hermetically assembled in a second installation groove provided in the second partition 7. Both ends of the exhaust duct 19 are respectively communicated with the compression chamber 9 and the exhaust air chamber of the condenser 17. Among them, the first installation groove is arranged at the middle position of the first partition 6, and the second installation groove is arranged at the edge position of the second partition 7, so that the subcooler 5 and the exhaust duct are arranged staggeredly left and right.

[0024] In this embodiment, the air extraction duct 15 is communicated with the air duct interface 14 of the return air grille 4, the other end of the air extraction duct 15 is communicated with the air inlet of the subcooler 5 assembled on the first partition 6, the air outlet of the subcooler 5 is located in the compression chamber 9, and at the same time, both ends of the exhaust duct 19 assembled on the second partition 7 are communicated with the compression chamber 9 and the exhaust air chamber of the condenser 17, thereby forming an exhaust passage opening for the low-temperature and dirty air in the carriage.

[0025] When the bus air conditioner is running, under the exhaust action of the condenser fan 18, the exhaust chamber of the condenser 17 is in a negative pressure state. A part of the relatively low-temperature (about 26°C) dirty air in the bus compartment enters the return air grille 4 from the roof return air inlet, enters the air inlet of the subcooler 5 through the air intake pipe 15, and the hot air formed by absorbing the heat of the high-pressure liquid refrigerant in the subcooler 5 is discharged into the compression chamber 9 from the air outlet of the subcooler 5. Then, the hot air in the compression chamber 9 is drawn into the exhaust chamber of the condenser 17 by the condenser fan 18 through the exhaust pipe 19 and discharged into the atmosphere through the condenser fan 18. Since the exhaust passage opening of the exhaust gas in the compartment is increased, the amount of exhaust gas that needs to be discharged from the gaps between the doors and windows is significantly reduced, and the air pressure difference between the inside and outside of the vehicle can also be reduced. The positive pressure value in the compartment can be reduced to less than 5 Pa or even approach 0 Pa, so that the exhaust gas discharge is completely borne by the newly added exhaust passage of the cooling structure. When the pressure in the compartment is 0 Pa, the pressure of the air conditioner return air chamber 12 is about -140 Pa (the average resistance of the filter screen is calculated as 140 Pa). The replenishment rate of the fresh air valve is about 3.42 m / s, and the replenished fresh air volume is 406 m³ / h, thus increasing the fresh air volume supply by about 27%. Through the exhaust air volume of this cooling structure, the fresh air volume supply of the compartment is further increased.

[0026] Furthermore, the high-pressure liquid refrigerant in the subcooler 5 is further cooled, and after cooling, it passes through the expansion valve for throttling and pressure reduction and enters the evaporator 3 for refrigeration. Thereby, the supercooling temperature of the high-pressure liquid refrigerant in the refrigeration system can be increased, the flash steam during the throttling of the expansion valve can be significantly reduced, the liquid temperature when the refrigerant enters the evaporator 3 is also reduced, the heat transfer temperature difference at the inlet section of the evaporator 3 is increased, and the refrigeration capacity and energy efficiency ratio of the air conditioning system are significantly increased. When the ambient temperature is 35°C, the supercooling degree of the air conditioning system is increased by about 8°C, the refrigeration capacity of the air conditioner is increased by about 10%, and the energy efficiency ratio of the air conditioner is increased by about 10%, resulting in significant energy savings for the air conditioner. The higher the outside ambient temperature, the greater the increase in the supercooling degree, and the greater the increase in the refrigeration capacity and energy efficiency ratio, improving the energy-saving benefit.

[0027] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A cooling structure of an exhaust gas emission cooling subcooler, characterized in that It includes a housing, an evaporation fan, an evaporator, a return air grille and a subcooler. Inside the housing, a first partition and a second partition are provided to divide it into a supply air chamber, a compression chamber and an exhaust air chamber. The subcooler is arranged on the first partition, and its air outlet is communicated with the compression chamber; The evaporation fan and the evaporator are arranged in the supply air chamber. A third partition is provided at the end of the evaporator close to the first partition, and a return air chamber is formed inside it. The return air grille is arranged in the return air chamber. The air duct interface of the return air grille is communicated with a provided air extraction duct. The other end of the air extraction duct passes through the third partition and is communicated with the air inlet of the subcooler; An installation plate, a condenser and a condensation fan are arranged in the exhaust air chamber. The condenser and the condensation fan are arranged on the installation plate. An exhaust duct is provided on the second partition. Both ends of the exhaust duct are respectively communicated with the compression chamber and the exhaust air chamber of the condenser.

2. The cooling structure of the exhaust gas emission cooling subcooler according to claim 1, characterized in that, A fresh air inlet is provided on the housing and is communicated with the return air chamber.

3. The cooling structure of the exhaust gas emission cooling subcooler according to claim 1, wherein, The joints of the air extraction duct with the air duct interface and the air extraction duct with the air inlet of the subcooler are tightly sealed by provided hose clamps.

4. The cooling structure of the exhaust gas emission cooling subcooler according to claim 1, characterized in that, The subcooler is hermetically assembled in a first installation groove provided on the first partition, and the exhaust duct is hermetically assembled in a second installation groove provided on the second partition.

5. The cooling structure of the exhaust gas exhaust cooling subcooler according to claim 4, characterized in that: The first installation groove is arranged at the middle position of the first partition, and the second installation groove is arranged at the edge position of the second partition, so that the subcooler and the exhaust duct are arranged staggeredly left and right.

6. The cooling structure of the exhaust gas emission cooling subcooler according to claim 1, characterized in that, There are multiple evaporation fans, which are fixed on the housing by bolts.

7. The cooling structure of the exhaust gas emission cooling subcooler according to claim 1, characterized in that, The return air grille is arranged in the return air chamber along the length direction of the housing.

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