Flow guide structure and automobile heating ventilation air conditioner air distribution box

Abstract

The utility model discloses a diversion structure and an automobile heating ventilation air conditioner air distribution box, the diversion structure comprises a hot channel and a cold channel, the hot channel comprises a guide air inlet section, a first guide air outlet section and a second guide air outlet section, an injection flow channel is arranged in the hot channel, and the injection flow channel comprises an injection air inlet section, a first injection air outlet section and a second injection air outlet section; an end inlet of the injection air inlet section is formed in the channel wall of the hot channel guiding air inlet section, and the first injection air outlet section and the second injection air outlet section extend from the tail end of the injection air inlet section to the outlet direction of the first guiding air outlet section and the outlet direction of the second guiding air outlet section correspondingly. An outlet of the first injection air outlet section and an outlet of the second injection air outlet section are located in the first guide air outlet section and the second guide air outlet section correspondingly, and the outlet area of the first injection air outlet section and the outlet area of the second injection air outlet section are both smaller than the inlet area of the injection air inlet section. High-speed airflow is formed at the outlet of the ejection flow channel to drive hot air to flow upwards, and the problem of cold air backflow can be effectively solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive air conditioning systems, specifically, it relates to a flow guiding structure and an automotive HVAC air distribution box. Background Technology

[0002] Automotive heating, ventilation, and air conditioning (HVAC) refers to the system or related equipment responsible for heating, ventilation, and air conditioning within a vehicle. The air distribution box (distribution box) is an important component of the automotive air conditioning system. A traditional air distribution box mainly consists of a housing and multiple dampers located within the housing. The housing has multiple outlets leading to different locations within the vehicle, and the airflow direction can be controlled by adjusting the damper openings. To ensure more even mixing of hot and cold air, a guide structure is usually installed inside the air distribution box. These guide structures are mostly plate-shaped or channel-type. Channel-type guide structures generally have separate cold and hot channels. The cold channel directs cold air to the footwell outlet, while the hot channel directs hot air to the face and defrost outlets. In face and footwell blowing mode, the defrost damper is closed, while the face and footwell dampers are open. With the lower mixing damper at a small opening, the upper part of the air distribution box has a larger volume of cold air, while the lower part has a smaller volume of hot air. Most of the air is concentrated in the upper part, and the pressure in the cold air layer is greater than that in the hot air layer. This can easily cause cold air backflow at the upper outlet of the hot air channel, hindering the normal operation of the air conditioning system and affecting the passenger experience. If the pressure of the hot air layer is increased or the pressure of the cold air layer is decreased to avoid the backflow of cold air when the mixing damper is slightly open, the resistance of the air distribution box will inevitably increase, which is not conducive to the operation of the air conditioner. Utility Model Content

[0003] This invention was developed to solve the above-mentioned problems, and aims to provide a flow guiding structure and an automotive HVAC air distribution box that can improve the problem of cold air backflow without increasing the gas flow resistance in the air distribution box.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A flow guiding structure includes a hot aisle and a cold aisle. The hot aisle includes a guide air inlet section and a first guide air outlet section and a second guide air outlet section connected to the tail end of the guide air inlet section, wherein:

[0006] The hot aisle is also equipped with an ejector channel, which is Y-shaped and includes an ejector inlet section and a first ejector outlet section and a second ejector outlet section that are connected to the tail end of the ejector inlet section.

[0007] The end inlet of the ejector air inlet section is opened on the channel wall of the hot channel guide air inlet section. The first ejector air outlet section and the second ejector air outlet section extend from the tail end of the ejector air inlet section to the outlet direction of the first guide air outlet section and the outlet direction of the second guide air outlet section, respectively.

[0008] The outlets of the first ejector air section and the second ejector air section are located inside the first guide air section and the second guide air section, respectively, and the outlet areas of the first ejector air section and the second ejector air section are both smaller than the inlet area of ​​the ejector air section.

[0009] Furthermore, the ejector channel is connected to the hot runner only through the end of the ejector inlet section, the first ejector outlet section is suspended in the middle of the first guide outlet section, and the second ejector outlet section is suspended in the middle of the second guide outlet section.

[0010] Furthermore, the ejector channel, hot channel, and cold channel are integrally molded.

[0011] Preferably, the material of the ejector channel, hot channel, and cold channel is PPTD20.

[0012] An automotive HVAC air distribution box includes a housing, an adjustment unit disposed within the housing, and a flow guiding structure, wherein the flow guiding structure is the aforementioned flow guiding structure.

[0013] Furthermore, the housing has an air inlet, a defrost outlet, a face blowing outlet, and a foot blowing outlet; the regulating unit includes a defrost damper, a face blowing damper, a foot blowing damper, an upper mixing damper, and a lower mixing damper.

[0014] Furthermore, the end inlet of the ejector air intake section faces the air intake surface.

[0015] Furthermore, the lower part of the automotive HVAC air distribution box is equipped with a heater core and a PTC; the upper mixing damper is located above the heater core, between the air inlet surface and the air guide structure; the lower mixing damper is located between the air inlet surface and the heater core.

[0016] Furthermore, the hot aisle is Y-shaped, with the inlet of the guide air inlet section facing the warm air core and PTC, the first guide air outlet section extending from the tail end of the guide air inlet section towards the defrost outlet, and the second guide air outlet section extending from the tail end of the guide air inlet section towards the blowing surface outlet; the cold aisle is fan-shaped, with the inlet facing the air inlet surface and the outlet facing the foot outlet.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The air guiding structure of this utility model and the air distribution box of the car heating and ventilation system are provided with an ejector channel. Since the outlet area of ​​the first ejector air outlet section and the second ejector air outlet section is small, the outlet of the ejector channel forms a high-speed airflow, which drives the surrounding hot air to flow upward. This can effectively improve the problem of cold air backflow, improve the comfort of the in-vehicle environment, and bring a better riding experience to passengers.

[0019] 2. The flow guiding structure and automotive HVAC distribution box of this utility model improve the existing flow guiding structure by adding an ejector channel inside the hot channel. It can improve the existing flow guiding structure without changing the shape of the existing flow guiding structure and the size design of the hot and cold channels. It effectively improves the backflow of cold air while minimizing the impact on the resistance of the distribution box. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the automotive HVAC air distribution box in Embodiment 1 of this utility model;

[0021] Figure 2 This is a cross-sectional view of the automotive HVAC air distribution box in Embodiment 1 of this utility model;

[0022] Figure 3 This is a schematic diagram of the flow guiding structure in Embodiment 1 of this utility model;

[0023] Figure 4 This is a cross-sectional view of the flow guiding structure in Embodiment 1 of this utility model. Figure 1 ;

[0024] Figure 5 This is a cross-sectional view of the flow guiding structure in Embodiment 1 of this utility model. Figure 2 ;

[0025] Figure 6 This is a schematic diagram of the damper opening when the car HVAC system is operating in face and foot blowing mode in Embodiment 2 of this utility model;

[0026] Figure 7 This is a schematic diagram of the flow guiding structure of the existing air distribution box used in the simulation experiment of Embodiment 2 of this utility model;

[0027] Figure 8 is a schematic diagram of the simulation results of the gas flow direction and temperature distribution in the air distribution box in Embodiment 2 of this utility model. Figure 8(a) shows the simulation results of the gas flow direction and temperature distribution in the existing air distribution box, and Figure 8(b) shows the simulation results of the gas flow direction and temperature distribution in the air distribution box in Embodiment 1.

[0028] Icon labels:

[0029] 1- Existing air distribution box's airflow guiding structure;

[0030] 10-Housing, 11-Air inlet, 12-Defrost outlet, 13-Face blowing outlet, 13a-Left air blowing, 13b-Middle left air blowing, 13c-Middle right air blowing, 13d-Right air blowing, 14-Foot blowing outlet, 14a-Front left foot blowing, 14b-Front right foot blowing, 14c-Rear left foot blowing, 14d-Rear right foot blowing; 20-Adjusting unit, 21-Defrost damper, 22-Face blowing damper, 23-Blowing Foot damper, 24-upper mixing damper, 25-lower mixing damper; 30-flow guide structure, 31-hot channel, 311-guided air inlet section, 312-first guided air outlet section, 313-second guided air outlet section, 32-cold channel, 33-ejector flow channel, 331-ejector air inlet section, 332-first ejector air outlet section, 333-second ejector air outlet section; 41-warm air core, 42-PTC. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the following embodiments, in conjunction with the accompanying drawings, will specifically illustrate the airflow guiding structure and automotive HVAC air distribution box of this utility model.

[0032] Example 1

[0033] like Figure 1 , 2 As shown, the automotive HVAC air distribution box (hereinafter referred to as the air distribution box) includes a housing 10, an adjustment unit 20 disposed within the housing 10, and a flow guiding structure 30. The housing 10 has an air inlet 11, a defrost outlet 12, a face outlet 13, and a foot outlet 14. The adjustment unit 20 includes a defrost damper 21, a face damper 22, a foot damper 23, an upper mixing damper 24, and a lower mixing damper 25. The flow guiding structure 30 includes a hot channel 31 and two cold channels 32 respectively disposed on both sides of the hot channel 31. The internal spaces of the hot channel 31 and the cold channel 32 are independent and not interconnected. A heater core 41 and a PTC 42 are also installed at the lower part of the air distribution box. The upper mixing damper 24 is located above the warm air core 41, between the air inlet surface 11 and the guide structure 30; the lower mixing damper 25 is located between the air inlet surface 11 and the warm air core 41. The upper mixing damper 24 and the lower mixing damper 25 control the volume of cold and hot air in the air distribution box, respectively. The airflow passes through the lower mixing damper 25, is heated by the warm air core 41 and PTC 42 to form hot air, and mixes with the cold air passing through the upper mixing damper 24 before flowing to the outlets of the air distribution box.

[0034] Specifically, such as Figure 2 , 3As shown, the hot channel 31 of the airflow guiding structure 30 is Y-shaped, including a guide air inlet section 311 and a first guide air outlet section 312 and a second guide air outlet section 313 connected to the tail end of the guide air inlet section 311. The inlet of the guide air inlet section 311 faces the warm air core 41 and the PTC 42. The first guide air outlet section 312 extends from the tail end of the guide air inlet section 311 towards the defrost outlet 12, and the second guide air outlet section 313 extends from the tail end of the guide air inlet section 311 towards the air blowing outlet 13. The cold channel 32 of the airflow guiding structure 30 is fan-shaped, with the inlet facing the air inlet surface 11 and the outlet facing the foot outlet 14.

[0035] like Figures 2-5 As shown, the heat channel 31 of the flow guiding structure 30 is further provided with an ejector channel 33, which is Y-shaped and includes an ejector air inlet section 331 and a first ejector air outlet section 332 and a second ejector air outlet section 333 connected to the tail end of the ejector air inlet section 331. The end inlet of the ejector air inlet section 331 is opened on the channel wall of the heat channel 31 guide air inlet section 311, facing the air inlet surface 11; the first ejector air outlet section 332 and the second ejector air outlet section 333 extend from the tail end of the ejector air inlet section 331 towards the outlet direction of the first guide air outlet section 312 and the outlet direction of the second guide air outlet section 313, respectively. The outlets of the first ejector air outlet section 332 and the second ejector air outlet section 333 are located inside the first guide air outlet section 312 and the second guide air outlet section 313, respectively, and the outlet areas of the first ejector air outlet section 332 and the second ejector air outlet section 333 are both smaller than the inlet area of ​​the ejector air inlet section 331. In this embodiment, the ejector channel 33 is connected to the hot runner only through the end of its ejector air inlet section 331. The first ejector air outlet section 332 is suspended in the middle of the first guide air outlet section 312, and the second ejector air outlet section 333 is suspended in the middle of the second guide air outlet section 313. The ejector channel 33, the hot channel 31, and the cold channel 32 are integrally formed, and the preferred material is PPTD20.

[0036] When the air distribution box is working, part of the warm air heated by the warm air core 41 and PTC 42 enters the hot channel 31 and flows along the hot channel 31 towards the outlet direction of the first guide air outlet section 312 and the second guide air outlet section 313. At the same time, a small stream of gas in the cold air entering the housing 10 flows into the ejector channel 33. Due to the small outlet area of ​​the first ejector air outlet section 332 and the second ejector air outlet section 333, a high-speed airflow is formed at the outlet of the ejector channel 33, which creates a low-pressure area near the outlet of the cold channel 32. The high-speed airflow achieves the ejection effect, driving the surrounding hot air to flow upward, thereby effectively improving the problem of cold air backflow in the hot channel 31.

[0037] Example 2

[0038] The existing air distribution box's flow guiding structure 1 lacks an ejector channel, such as... Figure 7As shown; the flow guiding structure 30 of Embodiment 1 of this utility model is provided with an ejector channel 33, as... Figure 3 As shown. To verify the effectiveness of the air distribution structure 30 and the automotive HVAC air distribution box in Example 1, simulation experiments were conducted on the existing air distribution box and the air distribution box of Example 1 under the same experimental conditions.

[0039] like Figure 1 As shown, the blowing surface outlet 13 on the air distribution box housing typically includes a left blowing surface 13a, a middle left blowing surface 13b, a middle right blowing surface 13c, and a right blowing surface 13d, and the blowing foot outlet 14 typically includes a front left blowing foot 14a, a front right blowing foot 14b, a rear left blowing foot 14c, and a rear right blowing foot 14d. Figure 6 As shown in the table below, assuming the automotive HVAC system operates in face / foot blowing mode, with the lower mixing damper at 25°C and 20% opening, the temperature at each outlet of the automotive HVAC system is recorded.

[0040]

[0041] The simulation results of gas flow direction and temperature distribution in the existing air distribution box are shown in Figure 8(a); the simulation results of gas flow direction and temperature distribution in the air distribution box of Example 1 are shown in Figure 8(b). The comparison shows that the flow guiding structure 30 and the automotive HVAC air distribution box of this utility model can effectively improve the problem of cold air backflow, and the surface temperature is significantly increased while the foot temperature is decreased, thus reducing the temperature difference between the surface and foot, improving the comfort of the in-vehicle environment and providing passengers with a better riding experience.

[0042] The above embodiments are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model.

Claims

1. A flow guiding structure, comprising a hot channel and a cold channel, wherein the hot channel includes a guide air inlet section and a first guide air outlet section and a second guide air outlet section connected and communicating with the tail end of the guide air inlet section, characterized in that, in: The hot channel is also provided with an ejector channel, which is Y-shaped and includes an ejector air inlet section and a first ejector air outlet section and a second ejector air outlet section that are connected to the tail end of the ejector air inlet section. The end inlet of the ejector air inlet section is opened on the channel wall of the hot channel guide air inlet section, and the first ejector air outlet section and the second ejector air outlet section extend from the tail end of the ejector air inlet section to the outlet direction of the first guide air outlet section and the outlet direction of the second guide air outlet section, respectively. The outlets of the first ejector air section and the second ejector air section are located inside the first guide air section and the second guide air section, respectively, and the outlet areas of the first ejector air section and the second ejector air section are both smaller than the inlet area of ​​the ejector air section.

2. The flow guiding structure according to claim 1, characterized in that: The ejector channel is connected to the hot channel only through the end of the ejector air inlet section. The first ejector air outlet section is suspended in the middle of the first guide air outlet section, and the second ejector air outlet section is suspended in the middle of the second guide air outlet section.

3. The flow guiding structure according to claim 1, characterized in that: The ejector channel, the hot channel, and the cold channel are integrally formed.

4. The flow guiding structure according to claim 3, characterized in that: The ejector channel, hot channel, and cold channel are made of PPTD20.

5. An automotive HVAC air distribution box, comprising a housing, an adjustment unit disposed within the housing, and an airflow guiding structure, characterized in that: in, The flow guiding structure is the flow guiding structure described in any one of claims 1 to 4.

6. The automotive HVAC air distribution box according to claim 5, characterized in that: The housing has an air inlet, a defrost outlet, a face blowing outlet, and a foot blowing outlet; The regulating unit includes a defrosting damper, a face blowing damper, a foot blowing damper, an upper mixing damper, and a lower mixing damper.

7. The automotive HVAC air distribution box according to claim 6, characterized in that: The end inlet of the ejector air inlet section faces the air inlet surface.

8. The automotive HVAC air distribution box according to claim 6, characterized in that: The lower part of the automotive HVAC air distribution box is equipped with a heater core and a PTC. The upper mixing damper is located above the warm air core, between the air inlet surface and the air guide structure; The lower mixing damper is located between the air inlet surface and the warm air core.

9. The automotive HVAC air distribution box according to claim 8, characterized in that: The hot channel is Y-shaped, the inlet of the guide air inlet section faces the warm air core and the PTC, the first guide air outlet section extends from the tail end of the guide air inlet section toward the defrost outlet, and the second guide air outlet section extends from the tail end of the guide air inlet section toward the blowing surface outlet. The cold aisle is fan-shaped, with the inlet facing the air inlet and the outlet facing the foot outlet.

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