Air conditioning air outlet system of engineering machinery

Abstract

The utility model discloses an engineering machinery air conditioner air outlet system, aims at solving the problem of uneven air supply, poor comfort and single function in the cab. The system comprises an evaporator, a main air duct and first and second auxiliary air ducts. The area ratio of the main and auxiliary air outlets of the evaporator is 8:2, realizing source air volume distribution. The main air duct is arranged along the front side of the cab, and a plurality of gradient-changing wind-blocking structures are arranged on the lower side of the inside of the main air duct. Through the decreasing spacing and slope angle, the wind pressure loss is dynamically compensated, and the air volume of the plurality of front air outlets is ensured to be uniform. At the same time, the upper part of the air duct is designed with a guide structure to ensure the defogging air volume, and the end is smoothly connected to the second auxiliary air duct through a contraction structure to improve the air induction efficiency. The first auxiliary air duct can also provide accurate cooling air volume for the refrigerated container according to the area ratio of 13:7. The utility model realizes the multifunctional, efficient, uniform and comfortable cab air supply environment through system layout and flow channel optimization.

Description

Technical Field

[0001] This utility model relates to an air conditioning outlet system for construction machinery, belonging to the technical field of air conditioning systems for construction machinery. Background Technology

[0002] In the construction machinery industry, the comfort and functionality of the cab air conditioning system have become key indicators for measuring product quality. Currently, to ensure uniform airflow distribution from multiple air conditioning outlets driven by a single evaporator, the industry generally adopts a classic design paradigm: placing the air conditioning evaporator at the center of the entire air duct in the left-right direction. This layout aims to distribute airflow to the left and right ducts with the shortest path and near symmetrical distribution, thus theoretically achieving the goal of uniform airflow.

[0003] However, this symmetrical layout centered on the evaporator has revealed several serious limitations in practice. First, it severely restricts innovative design and space planning for the cab. The compact internal structure of construction machinery cabs, with complex layouts of control consoles, columns, and various operating levers, often fails to provide sufficient space for the centrally located evaporator, leading to design compromises or reduced space utilization within the cab. Second, even if space permits, this structure struggles to meet diverse functional requirements, such as efficiently providing stable airflow to the sides of the cab or integrated refrigeration units. A more critical technical flaw lies in the significantly reduced airflow at the air outlets at the duct ends due to pressure decay along the path, resulting in poor airflow in areas far from the evaporator and significant uneven temperature and wind speed fields throughout the cab, severely impacting driving comfort. Furthermore, additional ducts added for functions such as defogging and side ventilation also suffer from poor performance due to uneven flow distribution within the main duct itself.

[0004] Therefore, there is an urgent need in this field for a groundbreaking air conditioning duct system design that can break free from the traditional design constraint of "the evaporator must be centered" and ensure uniform and stable airflow from all air outlets while adapting to complex and diverse interior structures of the driver's cab. Summary of the Invention

[0005] Purpose of the invention: In view of the shortcomings of the existing technology, this utility model provides an air conditioning system for engineering machinery to solve the problems mentioned in the background technology.

[0006] Technical solution: An air conditioning system for construction machinery, comprising an evaporator, a main air duct fixedly connected to the evaporator, a first secondary air duct fixedly connected to the evaporator, and a second secondary air duct connected to the end of the main air duct away from the first secondary air duct; The evaporator is provided with a main air outlet and a secondary air outlet, which are respectively connected to the air inlet of the main air duct and the air inlet of the first secondary air duct. The opening area ratio of the main air outlet to the secondary air outlet is 8:2. The first and second auxiliary air ducts are vertically installed on the pillars on the left and right sides of the cab, and the air outlets of the first and second auxiliary air ducts are both located at the ends for lateral air outlet. The main air duct is installed in the control panel on the front side of the cab. The main air duct has at least four front air vents on the side near the driver's seat and at least three defogging air vents on the side near the windshield; the lower side of the main air duct is provided with four windbreak structures of different positions and shapes corresponding to the positions of the front air vents.

[0007] This invention solves the core problems of single-function air supply, unreasonable layout, and uneven airflow in the cab's air conditioning system. By constructing a system architecture of "main air duct + dual auxiliary air ducts" and pre-setting an 8:2 main-to-auxiliary air outlet area ratio, it achieves directional air supply to the front, sides, and front window of the cab. At the same time, by setting customized windbreak structures at key locations, it actively adjusts the internal flow field of the air duct, laying a structural foundation for achieving uniform exhaust of the entire main air duct.

[0008] The four wind-blocking structures, arranged sequentially along the wind flow direction, include a first wind-blocking structure, a second wind-blocking structure, a third wind-blocking structure, and a fourth wind-blocking structure. The first windbreak structure is provided with an inclined surface that slopes toward the corresponding front air outlet; The distance between the second windshield structure and the corresponding front air outlet is less than the distance between the first windshield structure and the corresponding front air outlet, and the second windshield structure is provided with an inclined surface that slopes toward the corresponding front air outlet. The distance between the third windbreak structure and the corresponding front air outlet is less than the distance between the second windbreak structure and the corresponding front air outlet, and the third windbreak structure is provided with an inclined surface that tilts toward the corresponding front air outlet. The fourth windbreak structure is provided with an inclined surface that slopes toward the corresponding front air outlet; From the first windbreak structure to the fourth windbreak structure, the angle of the inclined surface tilting towards the front air outlet gradually decreases.

[0009] This invention addresses the issue of uneven airflow at the front and rear air outlets caused by pressure attenuation along the main air duct. By constructing a gradient resistance design with decreasing distance and decreasing slope angle, differentiated and gradually decreasing resistance is provided to the front air outlets at different locations. This dynamically compensates for pressure loss and ensures highly consistent airflow at all front air outlets, representing the core technology for achieving uniform air delivery.

[0010] The upper side of the first windbreak structure is provided with an inclined surface that gradually rises from the air intake direction; A fifth windbreak structure is provided near the first windbreak structure and between the two defogging air outlets; The upper side of the second windbreak structure is provided with an inclined surface that gradually rises from the air intake direction; The upper side of the third windbreak structure is provided with an inclined surface that gradually rises from the air inlet direction, and the third windbreak structure is located between two demisting air outlets near the second secondary air duct. The main air duct is connected to the second auxiliary air duct at one end with a gradually decreasing cross-section. The main air duct is connected to the second auxiliary air duct, which has a smaller pipe diameter than the main air duct, through the shrinking structure.

[0011] This invention addresses the related issues of insufficient airflow in the upper demisting section and low efficiency in the connection with the secondary air duct. By installing a lifting ramp and a dedicated windbreak structure at the top of the main air duct, sufficient airflow is prioritized to the demisting outlet, ensuring a safe visibility. Simultaneously, the contraction structure at the end achieves a smooth transition to the large-diameter secondary air duct, optimizing the ejection effect by utilizing the fluid acceleration principle. This balances the airflow in the main air duct while ensuring the air delivery efficiency of the furthest secondary air duct.

[0012] The refrigerator is also connected to the secondary air outlet, and the air inlet area ratio of the first secondary air duct to the air inlet of the refrigerator is 13:7.

[0013] This invention addresses the scalability issue of precise airflow distribution when integrating additional functions into an air conditioning system. By creating a branch for the refrigerated unit on the secondary air duct path and distributing secondary airflow according to a precise area ratio of 13:7, the cooling function and the lateral air supply function can work together without interference, thus enhancing the system's functionality and value.

[0014] The main air duct and the main air outlet are connected by a bent transition pipe. The transition pipe has a structure with a small air inlet and a large air outlet, and its air outlet has the same air inlet area as the air inlet of the main air duct.

[0015] This invention addresses the initialization issue of poor airflow when the evaporator outlet and the main duct inlet are spatially misaligned. A gradually expanding transition duct with a smaller inlet and a larger outlet is employed to decelerate and pressurize the turbulent, high-speed airflow from the evaporator, transforming it into a stable and uniform flow before it enters the main duct. This optimizes airflow quality from the source, creating favorable conditions for subsequent uniform distribution and helping to reduce system noise.

[0016] The air inlet of the second auxiliary air duct is connected to the air outlet of the main air duct, and the front section of the second auxiliary air duct has a structure with a gradually decreasing air intake area.

[0017] This addresses the problem of insufficient airflow energy at the end of the main duct hindering effective airflow into the secondary duct. By designing the inlet section of the second secondary duct as a tapered structure, Bernoulli's principle is utilized to increase the flow velocity and create a local low pressure, effectively drawing airflow into the secondary duct at the end of the main duct. This ensures the smooth flow of air into the secondary duct with lower energy consumption and guarantees the integrity of the airflow distribution throughout the system.

[0018] Beneficial Effects: This utility model, by constructing a system architecture of "main air duct + dual auxiliary air ducts" and pre-setting an 8:2 main-auxiliary air outlet area ratio, achieves directional functional air supply and efficient spatial integration for the front, sides, and front window of the cab. Based on this, it innovatively adopts a gradient-changing windbreak structure to dynamically compensate for wind pressure attenuation along the path, completely solving the core problem of uneven airflow at the front and rear air outlets and ensuring uniform air supply. Simultaneously, through the optimized design of gradually narrowing / expanding flow channels, it ensures both the defogging airflow and the air intake efficiency of the remote auxiliary air ducts, while also achieving a smooth airflow transition and noise control. Furthermore, the precise 13:7 area ratio provides accurate airflow distribution for the integrated refrigerated container, ultimately achieving a comprehensive beneficial effect of multi-functionality, balanced airflow, comfort, and energy saving. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention, in which the evaporator is omitted.

[0021] Figure 2 This is a structural diagram of the evaporator of this utility model.

[0022] Figure 3 This is a perspective view of the main air duct of this utility model, including the front air outlet and four internal windbreak structures.

[0023] Figure 4 This is a perspective view of the main air duct of this utility model, including the defogging air outlet and four internal windbreak structures.

[0024] Figure 5 This is a partial structural diagram of the second auxiliary air duct of this utility model.

[0025] Figure 6 This is a partial structural diagram of the second auxiliary air duct of this utility model.

[0026] Figure 7 This is a structural diagram of the over-pipeline after it has been disassembled according to this utility model. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] An air conditioning system for construction machinery includes an evaporator 1, a main air duct 2 fixedly connected to the evaporator 1, a first secondary air duct 3 fixedly connected to the evaporator 1, and a second secondary air duct 4 connected to the end of the main air duct 2 away from the first secondary air duct 3. The evaporator 1 is provided with a main air outlet 5 and a secondary air outlet 6, which are respectively connected to the air inlet of the main air duct 2 and the air inlet of the first secondary air duct 3. The opening area ratio of the main air outlet 5 to the secondary air outlet 6 is 8:2. The first auxiliary air duct 3 and the second auxiliary air duct 4 are vertically installed on the pillars on the left and right sides of the cab, and the air outlets of the first auxiliary air duct 3 and the second auxiliary air duct 4 are both located at the ends for lateral air outlet. The main air duct 2 is installed in the control panel on the front side of the cab. The main air duct 2 has at least four front air outlets 7 on the side near the driver's seat and at least three defogging air outlets 8 on the side near the windshield; the lower side of the main air duct 2 is provided with four windproof structures of different positions and shapes corresponding to the positions of the front air outlets 7.

[0031] This invention solves the core problems of single-function air supply, unreasonable layout, and uneven air volume in the cab air conditioning system. By constructing a system architecture of "main air duct 2 + dual auxiliary air ducts" and pre-setting an 8:2 main-to-auxiliary air outlet area ratio, it achieves directional air supply to the front, sides, and front window of the cab. At the same time, by setting customized windbreak structures at key locations, it actively adjusts the internal flow field of the air ducts, laying a structural foundation for achieving uniform exhaust throughout the main air duct 2.

[0032] The four wind-blocking structures, arranged sequentially along the wind flow direction, include a first wind-blocking structure 9, a second wind-blocking structure 10, a third wind-blocking structure 11, and a fourth wind-blocking structure 12. The first windbreak structure 9 is provided with an inclined surface that is tilted toward the corresponding front air outlet 7; The distance between the second windbreak structure 10 and the corresponding front air outlet 7 is less than the distance between the first windbreak structure 9 and its corresponding front air outlet 7, and the second windbreak structure 10 is provided with an inclined surface that is tilted toward the corresponding front air outlet 7. The distance between the third windbreak structure 11 and the corresponding front air outlet 7 is less than the distance between the second windbreak structure 10 and its corresponding front air outlet 7, and the third windbreak structure 11 is provided with an inclined surface that is inclined toward the corresponding front air outlet 7. The fourth windbreak structure 12 is provided with an inclined surface that is tilted toward the corresponding front air outlet 7; From the first windbreak structure 9 to the fourth windbreak structure 12, the angle of the inclined surface tilting towards the front air outlet 7 gradually decreases.

[0033] This paper addresses the issue of uneven airflow at the front and rear air outlets caused by pressure attenuation along the main air duct 2. By constructing a gradient wind resistance design with decreasing distance and decreasing slope angle, differentiated and gradually decreasing resistance is provided for the front air outlets 7 at different locations. This dynamically compensates for wind pressure loss and ensures that the airflow at all front air outlets 7 is highly consistent. This is the core technical means to achieve uniform air supply.

[0034] The first windbreak structure 9 has an inclined surface that gradually rises from the air intake direction on its upper side; A fifth windbreak structure is provided near the first windbreak structure 9, between the two defogging air outlets 8; The second windbreak structure 10 has an inclined surface that gradually rises from the air intake direction on its upper side; The upper side of the third windbreak structure 11 is provided with an inclined surface that gradually rises from the air inlet direction, and the third windbreak structure 11 is located between two demisting air outlets 8 near the second auxiliary air duct 4. The main air duct 2 and the second auxiliary air duct 4 are connected at one end by a shrinking structure with a gradually decreasing cross-section. The main air duct 2 is connected to the second auxiliary air duct 4, which has a smaller pipe diameter than the main air duct 2, through the shrinking structure.

[0035] This addresses the related issues of insufficient airflow in the upper demisting section and low connection efficiency of the secondary air duct. By installing a lifting ramp and a dedicated windbreak structure at the top of the main air duct 2, sufficient airflow is preferentially guided to the demisting outlet 8, ensuring a safe field of vision. At the same time, the contraction structure at the end achieves a smooth transition to the large-diameter secondary air duct, and the ejection effect is optimized by utilizing the fluid acceleration principle, ensuring the air delivery efficiency of the furthest secondary air duct while balancing the airflow in the main air duct 2.

[0036] The refrigerator 13 is also connected to the secondary air outlet 6. The ratio of the air inlet area of ​​the first secondary air duct 3 to the air inlet area of ​​the refrigerator 13 is 13:7.

[0037] This invention addresses the scalability issue of precise airflow distribution when integrating additional functions into an air conditioning system. By creating a branch for the refrigerated unit 13 on the secondary air duct path and performing secondary airflow distribution based on a precise area ratio of 13:7, the cooling function and the lateral air supply function can work together without interference, thus enhancing the system's functionality and value.

[0038] The main air duct 2 and the main air outlet 5 are connected by a bent transition pipe 14. The transition pipe 14 has a structure with a small air inlet and a large air outlet, and its air outlet has the same air inlet area as the air inlet of the main air duct 2.

[0039] This invention addresses the initialization issue of poor airflow when the air outlet of evaporator 1 and the air inlet of main duct 2 are connected due to spatial misalignment. A gradually expanding transition duct with a "small inlet, large outlet" design is employed to decelerate and pressurize the turbulent, high-speed airflow from evaporator 1, transforming it into a stable and uniform flow before it enters main duct 2. This optimizes airflow quality from the source, creating favorable conditions for subsequent uniform distribution and helping to reduce system noise.

[0040] The air inlet of the second auxiliary air duct 4 is connected to the air outlet of the main air duct 2, and the front section of the second auxiliary air duct 4 has a structure with a gradually decreasing air intake area.

[0041] This addresses the problem of insufficient airflow energy at the end of the main duct 2, hindering effective airflow diversion into the secondary duct. By designing the inlet section of the second secondary duct 4 as a tapered structure, Bernoulli's principle is utilized to increase the flow velocity and create a local low pressure, effectively drawing airflow into the secondary duct at the end of the main duct 2. This ensures the smooth flow of air into the secondary duct with lower energy consumption, guaranteeing the integrity of the airflow distribution throughout the system.

[0042] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air conditioning outlet system for engineering machinery, characterized in that: It includes an evaporator (1), a main air duct (2) fixedly connected to the evaporator (1), a first secondary air duct (3) fixedly connected to the evaporator (1), and a second secondary air duct (4) connected to the end of the main air duct (2) away from the first secondary air duct (3). The evaporator (1) is provided with a main air outlet (5) and a secondary air outlet (6), which are respectively connected to the air inlet of the main air duct (2) and the air inlet of the first secondary air duct (3). The opening area ratio of the main air outlet (5) to the secondary air outlet (6) is 8:

2. The first auxiliary air duct (3) and the second auxiliary air duct (4) are vertically installed on the pillars on the left and right sides of the cab, and the air outlets of the first auxiliary air duct (3) and the second auxiliary air duct (4) are both located at the ends for lateral air outlet. The main air duct (2) is installed in the control panel on the front side of the cab. The main air duct (2) has at least four front air outlets (7) on the side near the driver's seat and at least three defogging air outlets (8) on the side near the windshield; the lower side of the main air duct (2) is provided with four windproof structures of different positions and shapes corresponding to the positions of the front air outlets (7).

2. The air conditioning system for construction machinery according to claim 1, characterized in that: The four windbreak structures are, in order along the wind flow direction, the first windbreak structure (9), the second windbreak structure (10), the third windbreak structure (11) and the fourth windbreak structure (12). The first windbreak structure (9) is provided with an inclined surface that is inclined toward the corresponding front air outlet (7); The distance between the second windbreak structure (10) and the corresponding front air outlet (7) is less than the distance between the first windbreak structure (9) and its corresponding front air outlet (7), and the second windbreak structure (10) is provided with an inclined surface that is inclined toward the corresponding front air outlet (7); The distance between the third windbreak structure (11) and the corresponding front air outlet (7) is less than the distance between the second windbreak structure (10) and the corresponding front air outlet (7), and the third windbreak structure (11) is provided with an inclined surface that is inclined toward the corresponding front air outlet (7). The fourth windbreak structure (12) is provided with an inclined surface that is tilted toward the corresponding front air outlet (7); From the first windbreak structure (9) to the fourth windbreak structure (12), the angle of the inclined surface tilting towards the front air outlet (7) gradually decreases.

3. The air conditioning system for construction machinery according to claim 2, characterized in that: The first windbreak structure (9) has an inclined surface that gradually rises from the air intake direction on its upper side; A protruding fifth windbreak structure (15) is provided between the two defogging air outlets (8) near the first windbreak structure (9). The second windbreak structure (10) has an inclined surface that gradually rises from the air intake direction on its upper side; The third windbreak structure (11) has an inclined surface that gradually rises from the air inlet direction on its upper side, and the third windbreak structure (11) is located between two demisting air outlets (8) on the side close to the second auxiliary air duct (4). The main air duct (2) and the second auxiliary air duct (4) are connected at one end with a gradually decreasing cross-section. The main air duct (2) is connected to the second auxiliary air duct (4) with a smaller pipe diameter than the main air duct (2) through the shrinking structure.

4. The air conditioning system for construction machinery according to claim 3, characterized in that: The refrigerator (13) is also connected to the secondary air outlet (6), and the air inlet area ratio of the first secondary air duct (3) to the air inlet of the refrigerator (13) is 13:

7.

5. The air conditioning outlet system for construction machinery according to claim 4, characterized in that: The main air duct (2) and the main air outlet (5) are connected by a bent transition pipe (14). The transition pipe (14) has a structure with a small air inlet and a large air outlet, and its air outlet has the same air inlet area as the air inlet of the main air duct (2).

6. The air conditioning outlet system for construction machinery according to claim 5, characterized in that: The air inlet of the second auxiliary air duct (4) is connected to the air outlet of the main air duct (2), and the front section of the second auxiliary air duct (4) has a structure with a gradually decreasing air intake area.

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