WO2015012286A1

WO2015012286A1 - Vehicular air conditioner unit

Info

Publication number: WO2015012286A1
Application number: PCT/JP2014/069378
Authority: WO
Inventors: 久善吉崎; 幸央鈴木
Original assignee: 株式会社ヴァレオジャパン
Priority date: 2013-07-23
Filing date: 2014-07-23
Publication date: 2015-01-29
Also published as: JP2016182835A

Abstract

A vehicular air conditioner unit capable of easily tuning temperature and draft direction and also capable of comfortably keeping the head cool and the feet warm is achieved. A vehicular air conditioner unit is provided with a cold air flow channel (11), a warm air flow channel (12), a mixing chamber (13) for mixing cold air and warm air, a mixing means (30) disposed in the mixing chamber (13), and first and second blowout flow channels (14, 15) disposed downstream of the mixing chamber (13). The cold air flow channel (11) and the mixing chamber (13) are communicated by a cold air opening (111); the warm air flow channel (12) and the mixing chamber (13) are communicated by a warm air opening (121); the mixing means (30) has a moveable wall part (31) for adjusting the open surface area of the cold air opening (111) and the warm air opening (121), a warm-air-guiding flow channel (32) for leading some of the warm air to the first blowout flow channel (14), and a wall part flow channel (311a) formed in the moveable wall part (31) and ventilating the space between the cold air opening (111) and the warm air opening (121); and the area between the position of minimal cold air and the position of minimal warm air can be displaced.

Description

Air conditioning unit for vehicles

The present invention relates to a vehicle air conditioning unit for performing cooling and heating in a vehicle.

The vehicle air conditioning unit mixes the cool air cooled by the evaporator and the warm air heated by the heater core into air conditioning air, and blows out this air conditioning air to the passenger compartment, thereby providing comfortable air conditioning to the passengers. Provide dehumidification to prevent fogging such as windshields. Here, cooling is performed by increasing the cool air mixing ratio in the air for air conditioning, and heating is performed by increasing the warm air mixing ratio. The dehumidification is performed by air for air conditioning in which the cold air cooled by the evaporator is heated by the heater core to reduce the humidity.

For air conditioning, the air blown from the air conditioning unit for vehicles through the center vent outlet to the passenger compartment (upward air) mainly warms the upper body and head of the passenger, and passes through the foot outlet. Air blown into the passenger compartment (downward blowing air) warms feet mainly for passengers. Therefore, in order to realize a so-called cold head heat condition, which is comfortable heating for passengers, temperature tuning that appropriately sets the temperature difference between the upper blown air and the lower blown air, and the calorific difference between the two blown airs are appropriate. In order to achieve this, it is necessary to perform air distribution tuning that appropriately sets the blown air volume of both blown airs. Incidentally, the anti-fogging of the windshield is performed by the air (upward blowing air) blown into the passenger compartment through the defrost outlet.

However, downsizing of the air conditioning unit for vehicles has been required due to the downsizing of vehicles, the expansion of passenger compartment space to ensure comfortable living, and the increase in the number of onboard equipment accompanying higher functionality of vehicles. As a result, there was a restriction on the space in the mixing chamber of cool air and warm air to realize temperature tuning and air distribution tuning. Such constraints cannot deny that temperature tuning tends to be an essential (or decisive) factor.

Therefore, in a vehicle air conditioner (vehicle air conditioning unit), a rotary damper (wind distribution adjusting damper) that mixes warm air and cold air and distributes the air to the upper air outlet or the lower air outlet. ) Has a technical idea of providing a guide passage for flowing warm air toward the upper outlet (Patent Document 1). This guide passage can reduce the temperature difference between the upper blown air and the lower blown air by flowing a part of the warm air that flows to the lower blower outlet toward the upper blower outlet if there is no guide passage. It is possible (that is, temperature tuning is no longer an essential element (or a decisive element)), and a comfortable head cold foot condition is supposed to be realized.

Also, there is a technical idea related to an automotive heating / air conditioning device (vehicle air conditioning unit) in which a recess is provided in a part of the peripheral surface of a mixing flap that adjusts the mixing ratio of warm air and cold air (Patent Document 2). According to the technical idea, it is possible to appropriately reduce the temperature of the conditioned air (downward blowing air) in which a part of the cold air from the evaporator passes through the concave portion of the mixing flap and goes to the foot outlet (that is, the leg is too warm). It is said that a comfortable head cold foot condition can be realized.

In addition, at least one region of the peripheral surface of the drum-type mixing door that mixes the warm air and the cool air is disposed coaxially with the rotating shaft of the mixing door (the peripheral surface shape of the drum) and curved toward the rotating shaft. There is a technical idea related to an automotive air conditioner (vehicle air conditioning unit) having at least one region (in other words, reversely warped with respect to the peripheral shape) (Patent Document 3).

According to the technical idea, in the peripheral surface shape region, warm air is distributed upward on the inner surface (region between the peripheral surface and the rotating shaft), and cold air is distributed upward on the outer surface, Warm air and cold air are mixed to form upward blowing air. On the other hand, in the reverse warp region, the cool air is distributed upward and downward, and the cool air distributed downward by the outer surface of the reverse warp region is mixed with the warm air to become the lower blown air. As a result, it is said that the upper blown air and the lower blown air can be mixed appropriately, and the head cold foot heat situation can be realized.

International Publication No. WO2012 / 077539A1 Japanese Patent No. 4434395 Japanese Patent No. 4516569

However, in the technical idea disclosed in Patent Document 1, two items of temperature and wind distribution must be tuned by one adjustment item, that is, the angle adjustment of the rotary damper having a guide passage. It cannot be denied that tuning of the temperature difference of the blown air becomes an essential requirement (or a decisive requirement).

In the technical idea disclosed in Patent Document 2, there is room for improvement because the cool air from the evaporator is mixed with the warm air side while the warm air from the heater core is not mixed with the cool air side.

Further, in the technical idea disclosed in Patent Document 3, the peripheral surface shape region and the reverse warp region are necessarily present in different regions in the width direction of the mixing door (the axial direction of the rotation axis of the door). In the width direction, the vertical air distribution is different. For this reason, in the vehicle width direction, the degree of mixing between the upper blown air and the lower blown air is different, and it cannot be said that an appropriate head cold foot heat situation can be realized in both sides of the vehicle width. For example, if the airflow distribution of warm air and cold air is set so as to realize a comfortable head cold foot condition in the center area of the vehicle width, the temperature of both the upper and lower outlet air in the driver and passenger seats is higher than that in the center area of the vehicle width. It becomes high and it becomes difficult to realize comfortable head cold foot heat. In other words, the temperature tuning changes in the vehicle width direction.

Then, this invention can make temperature tuning and air distribution tuning easy, and makes it a subject to implement | achieve a comfortable head cold foot heat condition by making the temperature difference of upper blowing air and lower blowing air appropriate. . It is another object of the present invention to make the mixing degree of the upper blowing air and the lower blowing air in the vehicle width direction appropriate. It is another object of the present invention to provide an air conditioning unit for a vehicle that can warm up the upper blown air in the blowout mode of blowing from both the upper blower outlet and the lower blower outlet.

In order to solve the above problems, the vehicle air conditioning unit according to the present invention can be provided with cooling means for cooling the air in the cold air flow path, and heating means for heating the air in the warm air flow path. Cool air is allowed to flow into the mixing chamber disposed downstream of the cool air flow path and the warm air flow path from the cool air opening, and warm air is allowed to flow from the warm air opening so that the cool air and the warm air are mixed in the mixing chamber. Are mixed by the mixing means, and then supplied to the first blowout flow path and the second blowout flow path disposed downstream of the mixing chamber.

The mixing means includes a cold air minimizing position where the cold air opening is blocked by the movable wall to minimize the inflow of cold air, and a warm air minimizing position where the warm air opening is blocked by the movable wall and minimizes the inflow of warm air. It can be displaced between. Therefore, the temperature of the air supplied to the first blowing channel and the second blowing channel can be adjusted by changing the flow rates of the cool air and the warm air flowing into the mixing chamber by displacing the mixing means. it can.

Here, the mixing means includes a movable wall portion for adjusting the opening area of the cold air opening portion and the warm air opening portion, and warm air for guiding a part of the warm air flowing in from the warm air flow channel toward the first outlet flow channel. It has a guide channel and a wall channel provided in the movable wall in order to maintain ventilation between the cold air opening and the warm air opening.

The warm air guided to the first outlet channel by the warm air guide channel is not easily affected by the displacement of the mixing means. That is, the change in the flow rate of the warm air flowing into the first blow-off channel with respect to the displacement of the mixing means is alleviated. Since the warm air that has not flowed into the first blowing channel flows into the second blowing channel, the change in the flow rate of the warm air flowing into the second blowing channel with respect to the displacement of the mixing means is similarly mitigated. Further, since the warm air guide channel introduces warm air to the cold air side toward the first air flow channel in the mixing chamber, the upper air blown from the vehicle air conditioning unit is warmed.

Therefore, it is possible to prevent the flow rate difference between the warm air flowing into the first blow-out flow path and the warm air flowing into the second blow-out flow path from becoming too large (the temperature difference becoming too large), and to comfortably heat the head cold foot heat. In addition, non-critical temperature tuning (appropriate temperature tuning) is possible, and heating capacity is improved.

The wall channel flows cold air from the cold air opening side to the warm air opening side, appropriately reduces the temperature of the warm air flowing from the warm air opening to the mixing chamber, and flows into the first blow-off channel It is possible to prevent the temperature difference between the air that flows and the air that flows into the second blow-out flow path from becoming too large (to make the cold head heat more comfortable and make temperature tuning easier).

】 Since temperature tuning is separate from air distribution tuning, it does not interfere with air distribution tuning. That is, in the vehicle air conditioning unit, appropriate temperature tuning and appropriate air distribution tuning are realized.

In addition, the warm air guide channel and the wall channel are in the width direction of the mixing door (the axial direction of the rotation axis of the door) and do not necessarily exist in different regions. Therefore, the upper blowing air and the lower blowing air in the vehicle width direction. The degree of mixing with can be set appropriately.

As described above, the vehicle air conditioning unit realizes appropriate temperature tuning and air distribution tuning, and air (upward blowing air) blown out by the first blowing passage and air blown out by the second blowing passage ( It is possible to realize comfortable head cold foot heat with an appropriate temperature difference as the temperature difference between the lower blown air and the upper blown air, and the degree of mixing of the upper blown air and the lower blown air in the vehicle width direction. Can be set appropriately (Claim 1).

The mixing means disposed in the mixing chamber has a rotation shaft portion, and the movable wall portion of the mixing means rotates around the rotation shaft portion, and the rotation shaft portion is disposed downstream of the movable wall portion. (Claim 2). In addition to the wall flow path for ventilation between the cold air opening side and the warm air opening side, the movable wall portion provides ventilation for preventing air flow between the cold air opening side and the warm air opening side. It has a blocking part (claim 3).

That is, the movable wall portion of the mixing means is rotated around a rotating shaft portion disposed downstream of the cold air opening and the warm air opening, thereby adjusting the opening area of the cold air opening and the warm air opening, The ventilation between the opening side and the warm air opening side can be ensured by the wall channel, and the cool air can flow from the cold air opening side to the warm air opening side. Here, the flow rate of the cold air flowing through the wall channel is defined by the shape of the wall channel and the like, and is also defined by the ventilation block.

If the ventilation block is a curved surface with an arc-shaped cross section centered on the rotation shaft, it is possible to block ventilation between the cool air opening and the warm air opening even if the position of the mixing means is displaced (rotated). . Further, if the wall channel is any one of a curved surface, a flat surface, and a curved surface that is convex toward the rotation shaft portion, the cold air can be cooled even if the position of the mixing means is displaced (rotated). The air flow between the opening and the warm air opening can be maintained (claim 4).

The warm air guide channel has a warm air guide upstream end and a warm air guide downstream end, the warm air guide upstream end is disposed on the warm air opening side of the movable wall portion, and the warm air guide downstream end is on the cold air opening portion side of the movable wall portion If it is arrange | positioned, the warm air guide flow path can mix a part of warm air which flowed into the mixing chamber from the warm air opening part into the cold air which flowed into the mixing chamber from the cold air opening part (Claim 5).

The warm air guide channel has, for example, a substantially U-shaped cross section, and the bottom of the substantially U shape is disposed on the movable wall of the mixing means (Claim 6). For example, it is arranged closer to the rotating shaft part than the ventilation blocking part (Claim 7).

The vehicle air conditioning unit further includes distribution adjusting means for adjusting distribution between the amount of air flowing from the mixing chamber into the first outlet passage and the amount of air flowing into the second outlet passage. (Claim 8). Then, it is possible to smoothly distribute the amount of air flowing into the first blowing flow path and the amount of air flowing into the second blowing flow path (makes air distribution tuning easier). be able to.).

If the temperature of the air flowing through the first blowing passage is lower than the temperature of the air flowing through the second blowing passage, the vehicle air conditioning unit is comfortable for passengers. Can be realized (claim 9).

In the vehicle air conditioning unit, the air flowing through the first outlet channel is supplied to at least one of the defrost outlet, the center vent outlet, and the side vent outlet. 10) And by supplying the air flowing through the second outlet channel toward the foot outlet (claim 11), the interior of the vehicle can be comfortably cooled and heated, and appropriate dehumidification can be realized. Can do.

As described above, the vehicle air-conditioning unit according to the present invention provides a temperature difference between the upper blown air and the lower blown air in order to realize appropriate temperature tuning and air distribution tuning, and to realize comfortable heating of the cold head. In addition to being appropriate, it is possible to appropriately set the degree of mixing of the upper blown air and the lower blown air in the vehicle width direction, and it is possible to realize appropriate heating by further heating the upper blown air.

It is a figure showing the section schematic structure in one embodiment of the air-conditioning unit for vehicles concerning the present invention. It is a figure which shows the isometric view schematic structure of the mix door (mixing means) with which the vehicle air conditioning unit shown in FIG. 1 is provided. It is a figure which shows the side surface schematic structure (FIG.3 (a)) and bottom surface schematic structure (FIG.3 (b)) of the mix door shown in FIG. FIG. 4 is a diagram illustrating a front schematic structure (FIG. 4A) and a rear schematic structure (FIG. 4B) of the mix door in order to describe a warm air guide channel 32 included in the mix door illustrated in FIG. 2. It is a figure which shows the cross-sectional schematic structure of the mixing chamber vicinity for demonstrating mixing of cold air and warm air by the mix door etc. with which the vehicle air conditioning unit shown in FIG. 1 is equipped. It is a figure which shows a cold airflow and a warm airflow in order to demonstrate mixing with the cold air and warm air by the mix door etc. with which the vehicle air conditioning unit shown in FIG. 1 is equipped. It is a figure which shows the side surface schematic structure (FIG. 7 (a)) and bottom surface schematic structure (FIG.7 (b)) of the mix door in the modification of the mix door with which the vehicle air conditioning unit shown in FIG. 1 is provided.

Hereinafter, a vehicle air conditioning unit according to the present invention will be described with reference to the drawings.

<Vehicle air conditioning unit>
As shown in FIG. 1, the vehicle air conditioning unit 10 includes a cold air flow path 11 through which air supplied from the blower B flows, a warm air flow path 12 connected to the cold air flow path 11, a mixing chamber 13, and a cold air flow path. 11, a cold air opening 111 interposed between the mixing chamber 13, a warm air opening 121 interposed between the warm air flow path 12 and the mixing chamber 13, and a mix door (mixing means) 30 disposed in the mixing chamber 13. The upper outlet channel (first outlet channel) 14 disposed downstream of the mixing chamber 13 and on the cold air opening 111 side, and also disposed downstream of the mixing chamber 13 and on the warm air opening 121 side. A lower outlet passage (second outlet passage) 15, an air distribution door (distribution adjusting means) 40 disposed downstream of the mix door 30, and a differential vent door 50 disposed downstream of the upper outlet passage 14. Have. An evaporator N1 is disposed in the cold air flow path 11, and a heater core N2 is disposed in the warm air flow path 12.

The upper blow-out flow path 14 is disposed above the cold air opening 111 so that cold air from the cold air opening 111 (cold air blown upward from the cold air opening 111) is warmer than the warm air from the warm air opening 121. It is easy to flow. On the other hand, the lower outlet flow path 15 is disposed closer to the warm air opening 121 than the cold air opening 111, so that warm air from the warm air opening 121 is more easily flown than cool air from the cold air opening 111. Yes.

Here, the mix door 30 is for adjusting the mixing ratio of warm air and cold air (for temperature tuning). The air distribution door 40 is for distributing the air-conditioning air mixed in the mixing chamber 13 to the upper outlet flow path 14 and the lower outlet flow path 15. In other words, the air distribution door 40 is for rectifying the air-conditioning air blown from the mixing chamber 13 and tuning the air distribution of the blown air amount of the upper blown air and the lower blown air. Further, the differential vent door 50 rectifies the ventilation of the upper outlet flow passage 14 and adjusts the ratio of the respective blowout air amounts from the vent duct 21 and the defrost duct 22 disposed downstream of the upper outlet passage 14. is there. The mix door 30, the air distribution door 40, and the differential vent door 50 are all rotatable to rectify the air flow.

In the vehicle air conditioning unit 10 having the above configuration, the air supplied from the blower B to the cool air passage 11 is cooled by the evaporator N1 to become cool air, and a part of this cool air is introduced into the warm air passage 12, and the heater core It is heated by N2 and becomes warm. Here, as shown in FIG. 1, the upstream end of the warm air flow path 12 is connected to the cold air flow path 11 between the downstream of the evaporator N <b> 1 and the cold air opening 111. The air flowing through the warm air passage 12 rises in temperature and is dried.

The cool air flowing into the mixing chamber 13 through the cool air opening 111 and the warm air flowing into the mixing chamber 13 through the warm air opening 121 are mixed at a predetermined ratio in the mixing chamber 13 to form air conditioning air. The air is rectified by the wind door 40 and flows into the upper blowout flow path 14 or the lower blowout flow path 15 and blown out from the upper blowout flow path 14 or blown out from the lower blowout flow path 15. Here, the upper blown air blown from the upper blowout flow path 14 is blown through the upper duct 21 for cooling and heating, for example, from the center vent and the side vent, or blown through the defrost duct 22 for preventing fogging of the vehicle window. The On the other hand, the lower blowing air blown out from the lower blowing passage 15 into the passenger compartment is blown out from, for example, a foot side duct, and is mainly used for heating the lower limbs.

Note that the evaporator N1 has a purpose of cooling air, and may be a cooling device that allows, for example, cold water to flow instead of the evaporator. The heater core N2 only needs to have a function of heating air. For example, a heater using hot water or a heater using Joule heat can be used.

<Mix door (mixing means)>
As shown in FIGS. 2, 3 (a) and 3 (b), the mix door 30 includes a

rotary shaft portion

35 a, 35 b, a movable wall portion 31 that rotates around the

rotary shaft portions

35 a, 35 b, and a movable door portion. The warm air guide channel 32 disposed on the

rotating shaft portions

35a and 35b side of the wall portion 31 and the two side walls disposed so as to intersect the

rotating shaft portions

35a and 35b and having a substantially fan-shaped side view. Part 33.

The

rotating shaft portions

35a and 35b of the mix door 30 are supported by a rotating bearing portion (not shown) and are disposed downstream of the movable wall portion 31. The movable wall portion 31 includes the cold air opening portion 111 and the warm air opening portion 121. (Fig. 1).

When the mix door 30 is displaced so that the cold air opening 111 is substantially blocked by the movable wall 31, the mix door 30 is positioned at a cold air minimizing position that minimizes the opening area of the cold air opening 111. Here, the opening area of the cold air opening 111 is a cross-sectional area of a communication path that connects the cold air flow path 11 and the mixing chamber 13. When the movable wall portion 31 is in the cold air minimizing position, the opening area of the warm air opening portion 121 is the largest.

Similarly, when the mix door 30 is displaced so as to substantially close the warm air opening 121 with the movable wall 31, the mix door 30 is positioned at the warm air minimizing position that minimizes the opening area of the warm air opening 121. At this time, the opening area of the cold air opening 111 is the largest.

Therefore, by displacing the mix door 30 to the cool air minimizing position, the temperature of the air-conditioning air mixed and flowing down in the mixing chamber 13 can be maximized, and the mix door 30 is displaced to the warm air minimizing position. Thereby, the temperature of the air for an air conditioning which flows down from the mixing chamber 13 can be made the lowest.

<Movable wall>
The movable wall part 31 has a wall part flow path 311a and a ventilation blocking part 311b on the upstream side wall surface 311 (FIG. 3B). The wall portion flow path 311 a is formed at the center portion in the width direction of the upstream side wall surface 311, and the ventilation blocking portions 311 b are formed on both side portions in the width direction of the upstream side wall surface 311. The width of the wall portion flow path 311a is, for example, substantially equal to the width of one ventilation blocking portion 311b, and thus is approximately one third of the width of the movable wall portion 31.

The ventilation blocking portion 311b is a curved surface (convex surface) having an arc cross section centering on the

rotation shaft portions

35a and 35b, and is in contact with, for example, an edge region between the cold air opening portion 111 and the warm air opening portion 121 to mix. Regardless of the displacement position of the door 30, ventilation between the cool air opening 111 and the warm air opening 121 is prevented.

On the other hand, the wall channel 311a is for maintaining ventilation between the cool air opening 111 and the warm air opening 121 regardless of the displacement position of the mix door 30. The wall portion flow path 311a has, for example, a circular shape (convex curved surface), a straight line having a cross-sectional shape centered on the

rotation shaft portions

35a and 35b and a convex surface similar to the air flow preventing portion 311b and having a smaller curvature than the air flow preventing portion 311b. The surface (plane) to be formed, the surface having a curvature opposite to that of the ventilation blocking portion 311b (concave curved surface), or a combination of these.

Therefore, a step is generated between the wall portion flow path 311a and the ventilation block portion 311b. Of course, the shape of the wall channel 311a is not limited to the above shape as long as the ventilation between the cool air opening 111 and the warm air opening 121 is maintained.

On the other hand, the downstream side wall surface 312 of the movable wall portion 31 forms a curved surface or a flat surface with few steps between the side wall portions 33.

As shown in FIGS. 3A and 3B, the mix door 30 includes a cold air side door end portion 31 a at the cold air opening 111 side end portion of the movable wall portion 31, and a warm air opening portion of the movable wall portion 31. The warm side door end 31b may be provided at the 121 side end. Further, the cold air side door end portion 31 a and the warm air side door end portion 31 b may further be formed continuously with the side wall portion 33.

The mix door 30 can more reliably close the cool air opening 111 at the cool air minimizing position and the warm air opening 121 at the cool air minimizing position by the cold air door end 31a and the warm air door end 31b. Can be closed more reliably.

<Warm air guide channel>
The warm air guide channel 32 has a substantially U-shaped cross section as shown in FIGS. 2 and 4B, and is disposed on the downstream side wall surface 312 side of the movable wall portion 31. The warm air guide channel 32 has a substantially U-shaped bottom 32c disposed on the movable wall 31 side and is open on the downstream side.

The warm air guide upstream end 32 a of the warm air guide channel 32 is disposed on the warm air opening 121 side of the movable wall 31, and the warm air guide downstream end 32 b is disposed on the cold air opening 111 side of the movable wall portion 31. The downstream end 32b is farther from the movable wall portion 31 than the warm air guide upstream end 32a. Further, the warm air guide downstream end 32b is disposed downstream of the warm air guide upstream end 32a.

Therefore, the warm air guide channel 32 guides the warm air flowing from the warm air channel 12 to the mixing chamber 13 and reaching the warm air guide upstream end 32a to the warm air guide downstream end 32b, and from the cool air channel 11 to the mixing chamber. 13 can be mixed with the cold air flowing into the air. The shape or the like of the warm air guide channel 32 is not limited to the above shape as long as the warm air that has reached the warm air guide upstream end 32a is mixed with the cold air that has flowed into the mixing chamber 13.

<Mixing of cool air and warm air in the mixing chamber>
Next, mixing of cold air and warm air in the mixing chamber 13 will be described. First, mixing of cold air and warm air when the mix door 30 is between the cold air minimizing position and the warm air minimizing position will be described.

In FIG. 5, the mix door 30 has an opening ratio of the cold air opening 111 (the opening area of the cold air opening 111 at the cold air maximizing position (warm air minimizing position) of the opening area of the cold air opening 111 at the position of FIG. 5). The ratio of the area) is 50% or less, while the opening ratio of the warm air opening 121 is approximately 50% or more (warm air flows into the mixing chamber 13 more than cool air).

At this time, the cold air flow 112 (solid arrow in FIG. 6) flowing through the cold air flow path 11 passes through the cold air opening 111 and flows into the mixing chamber 13 as shown in FIG. Then, the flow is divided into a bypass cold airflow 112b that passes through the wall channel 311a of the movable wall 31 and flows to the warm air opening 121 side.

Immediately after passing through the cold air opening 111, the main cold air flow 112a expands in the vicinity of the mix door 30, so that the main mixed cold air flow 112c flows in the vicinity of the mix door 30 toward the upper outlet flow passage 14. And the sub-mixed cold airflow 112d that flows along the downstream side wall surface 312 (see FIGS. 2 and 4A) of the movable wall portion 31.

On the other hand, the warm air flow 113 (broken arrow in FIG. 6) flowing through the warm air flow path 12 expands in the vicinity of the mix door 30 immediately after passing through the warm air opening 121. The main mixed warm airflow 113a that flows toward the flow path 15 and the sub-mixed warm airflow 113b that is guided to the warm air guide flow path 32 and flows toward the main mixed cold airflow 112c are divided.

The main mixed cold airflow 112 c and the main mixed warm airflow 113 a can be mixed downstream of the mix door 30. Further, the sub-mixed cold airflow 112d flows along the downstream side wall surface 312 of the movable wall portion 31 and then mixes with the main mixed warm airflow 113a, whereby the main mixed warm airflow 113a can be cooled.

Now, on the downstream side of the movable wall portion 31 of the mix door 30, the submixed cold airflow 112d and the submixed warm airflow 113b flow in the crossing / collision direction. However, since the submixed warm air flow 113b is guided to the warm air guide channel 32 and flows therethrough, collision with the submixed cool airflow 112d is substantially avoided. That is, the submixed cold airflow 112d and the submixed warm airflow 113b can intersect without colliding with each other. In this way, the submixed warm airflow 113b can be mixed with the main mixed cold airflow 112c flowing toward the upper outlet flow passage 14, and the submixed cold airflow can be mixed with the main mixed warm airflow 113a flowing toward the lower outlet flow passage 15. The air flow 112d can be mixed.

Therefore, it is possible to prevent a temperature difference between the air-conditioning air blown out from the upper blowout flow path 14 and the lower blowout flow path 15 from becoming large. In other words, the temperature difference between the two can be set to an appropriate temperature difference. Further, in the vicinity of the warm air opening 121, the bypass cold air flow 112b is mixed with the warm air flow 113, and the temperature difference between the cold air flow 112 and the warm air flow 113 is alleviated. The temperature difference of the air-conditioning air blown from 15 can be set to a more appropriate temperature difference.

Thus, the mixing of the cool air and the warm air in the mixing chamber 13 and the vicinity thereof is performed by the mixing of the main mixed cold air flow 112c and the main mixed warm air flow 113a (mixing 1), which is generally performed in a rotary type mix door. In addition to mixing the sub-mixed cold airflow 112d to the main mixed warm airflow 113a (mixing 2), mixing (mixing 3) for guiding the bypass cold airflow 112b to the warm airflow 113 by the wall channel 311a, and the warm air guiding flow There is mixing (mixing 4) that guides the sub-mixed warm air flow 113b to the main mixed cold air flow 112c through the path 32. Since the mixing 3 and the mixing 4 are bidirectional, the temperature difference between the upper blowing air and the lower blowing air should be rationally adjusted as compared with the unidirectional mixing in which the cold air is mixed to the warm air side. Can do.

Here, if the opening ratio of the cold air opening 111 is increased, that is, if the opening ratio of the warm air opening 121 is decreased, the air-conditioning air flowing toward the upper blowing flow path 14 and the lower blowing flow path 15 is reduced. The temperature drops. On the other hand, if the opening ratio of the cold air opening 111 is reduced, that is, if the opening ratio of the warm air opening 121 is increased, the temperature of the air-conditioning air flowing toward the upper blowing flow path 14 and the lower blowing flow path 15 is increased. Rises.

Thus, by displacing the mix door 30, temperature tuning can be performed, and the temperature difference between the air-conditioning air blown from both the blow-out flow paths can be set to an appropriate temperature difference. The temperature change of the air-conditioning air with respect to the change in the opening ratio of 111 (change in the opening ratio of the warm air opening 121) is not an essential requirement (or a decisive requirement). That is, appropriate temperature tuning can be easily performed.

The air distribution door 40 disposed downstream of the mix door 30 rectifies the air-conditioning air mixed in the mixing chamber 13, thereby increasing or decreasing the flow rate of the air-conditioning air toward the upper outlet flow path 14. At the same time, the flow rate of the air-conditioning air toward the lower outlet passage 15 can be reduced or increased. In other words, the air distribution tuning can be performed by the air distribution door 40.

Here, the upper outlet flow path 14 is disposed above the cold air opening 111 so that the cold air from the cold air opening 111 flows more easily than the warm air from the warm air opening 121. Further, the lower blow-off flow path 15 is disposed closer to the warm air opening 121 than the cold air opening 111, so that the warm air from the warm air opening 121 can flow more easily than the cold air from the cold air opening 111. Yes.

When increasing the flow rate of air-conditioning air to the upper blow-off flow path 14, that is, when decreasing the flow rate of air-conditioning air to the lower blow-off flow path 15, the flow between the mixing chamber 13 and the upper blow-off flow path 14 The position of the air distribution door 40 is displaced so that the road is enlarged. On the other hand, when increasing the flow rate of the air-conditioning air to the lower outlet passage 15, the position of the air distribution door 40 is displaced so as to narrow the passage between the mixing chamber 13 and the upper outlet passage 14.

In this way, the temperature tuning is performed by the displacement of the mix door 30, and the air distribution tuning is performed by the air distribution door 40. Therefore, mutual interference between the temperature tuning and the air distribution tuning can be prevented, and thus the temperature is adjusted. Tuning and air distribution tuning are both easy, and a comfortable head cold foot heat situation can be realized.

In addition, since the bypass cold airflow 112b cannot flow through the ventilation blocking portion 311b of the movable wall portion 31, the flow width of the bypass cold airflow 112b is defined by the width of the wall portion flow passage 311a. The ventilation resistance to the bypass cold airflow 112b flowing to the warm air opening 121 side along the wall channel 311a depends on the width of the wall channel 311a, the shape of the curved surface, etc. The ventilation resistance can be determined by appropriately setting the shape.

Next, mixing of cold air and warm air when the mix door 30 is in the cold air minimizing position will be described. In this case, the cold airflow 112 flowing through the cold air flow path 11 is blocked by the movable wall portion 31 and the bypass cold airflow 112b is blocked by the warm air side door end portion 31b. Only the air flow 113 is obtained. Therefore, at this time, the temperature of the air for air conditioning becomes the highest.

The air for air conditioning is rectified by the air distribution door 40 and flows into the upper blowout flow path 14 and the lower blowout flow path 15. In this case, the temperature difference between the upper blown air blown from the center vent and the side vent or blown from the defrost to prevent fogging of the vehicle window and the lower blown air blown from the foot side duct is minimal or substantially zero. It becomes.

That is, the temperatures of the upper and lower blowing airs are the highest, and only the air distribution tuning of the upper and lower blowing air is performed.

Further, the mixing of the cool air and the warm air when the mix door 30 is in the warm air minimizing position will be described. In this case, the warm air flow 113 flowing through the warm air flow path 12 is blocked by the movable wall portion 31, and only the cold air flow 112 flows into the mixing chamber 13. Therefore, at this time, the temperature of the air-conditioning air is the lowest.

The air for air conditioning is rectified by the air distribution door 40 and flows into the upper blowout flow path 14 and the lower blowout flow path 15. The temperature difference between the upper blown air blown from the center vent and the side vent, or blown from the defrost to prevent fogging of the vehicle window, and the lower blown air blown from the foot duct is also minimal or substantially zero in this case. It becomes.

That is, the temperatures of the upper and lower blowing airs are the lowest, and only the air distribution tuning of the substantially upper blowing air and the lower blowing air is performed.

The configuration of the mix door 30 is not limited to that described above. For example, in another embodiment, the side wall 33 has a wall channel 331a (not shown) on its outer wall surface 331, and the outer wall surface 331 itself has a rotation shaft 35a, It can be inclined with respect to the axis 35b, and the space between the cold air door end 31a and the warm air door end 31b can be recessed (FIGS. 7A and 7B). . With such a shape, when the mix door 30 is between the cold air minimization position and the warm air minimization position, the main cold air flow 112a flowing into the mixing chamber 13 through the cold air passage 11 and Then, the air is diverted into a bypass cold airflow 112e (not shown) that passes through the wall channel 331a of the side wall 33 and flows to the warm air opening 121 side. And it can be guide | induced to the warm air flow 113, and can cool a downward blowing air. In general, foot outlets of a vehicle air conditioning unit are often provided at the left and right end portions of the unit, and wall flow paths 331a and 331a are provided in the left and right

side wall portions

33 and 33 of the mix door 30 to generate a warm air flow 113. Adding a cooling function is reasonable for cooling the lower blowing air.

Further, it is desirable that the warm air guide passage 32 is disposed between the ventilation block 311b and the

rotary shafts

35a and 35b. As described above, the warm air guide passage 32 guides the warm air flowing from the warm air flow path 12 to the mixing chamber 13 and reaching the warm air guide upstream end 32a to the warm air guide downstream end 32b. Here, since the warm air guide upstream end 32a is located on the

rotation shafts

35a, 35b side of the ventilation block 311b, the warm air reaching the warm air guide upstream end 32a is not changed even if the position of the mix door 30 is displaced. It is difficult to be influenced by the bypass cold airflow 112b passing through the path 311a, and therefore high temperature air can be stably guided to the warm air guide passage 32.

As described above, the vehicle air-conditioning unit 10 has an appropriate temperature difference between the upper blowing air and the lower blowing air in order to realize appropriate temperature tuning and air distribution tuning and to realize a comfortable head cold foot heat situation. In addition, the degree of mixing of the upper blown air and the lower blown air in the vehicle width direction can be set appropriately, and further, the upper blown air can be warmed to achieve appropriate heating.

In addition, the vehicle air conditioning unit according to the present invention is not limited to those described in the above embodiments, and can be appropriately modified and implemented without changing the gist thereof.

Since the vehicle air conditioning unit according to the present invention can be industrially manufactured and used, and can be sold commercially, the present invention has industrial value and is used industrially. It is an invention that can.

DESCRIPTION OF SYMBOLS 10 Vehicle air conditioning unit 11 Cold air flow path 111 Cold air opening part 12 Warm air flow path 121 Warm air opening part 13 Mixing chamber 14 1st blowing flow path (upper blowing flow path)
15 Second outlet channel (lower outlet channel)
30 Mixing means (mix door)
31 Movable Wall 311 Upstream Side 311a Movable Wall Wall Channel 311b Movable Wall Ventilation Block 312 Downstream Side Movable Wall 32 Warm Air Guide Channel 32a Warm Gas Upstream End 32b Warm Air Guidance Downstream End 32c Bottom part of warm air guide channel 33 Side wall part 331 Side wall part outer wall surface 331a Side wall

part channel channel

35a, 35b Rotating shaft part 40 Distribution adjustment means (wind distribution door)
B Blower N1 Cooling means (evaporator)
N2 heating means (heater core)

Claims

A cold air flow path;
A warm air flow path;
A mixing chamber arranged downstream of the cold air flow path and the warm air flow path to mix cold air and warm air;
A cold air opening communicating the cold air flow path and the mixing chamber;
A warm air opening communicating the warm air flow path and the mixing chamber;
A first outlet channel, a second outlet channel disposed downstream of the mixing chamber;
A movable wall portion that is disposed in the mixing chamber and adjusts an opening area of the cool air opening and / or the warm air opening, and a part of the warm air from the warm air channel is guided to the first outlet channel. A mixing means having a warm air guide flow path for use, a wall flow path provided in the movable wall section for maintaining ventilation between the cool air opening and the warm air opening, wherein the cold air opening Between the cold air minimizing position where the movable wall portion blocks the cold air inflow and the warm air opening portion is blocked by the movable wall portion to minimize the warm air inflow position. A vehicle air conditioner comprising: mixing means that enables adjustment of a temperature difference between the air flowing through the first blowing flow path and the air flowing through the second blowing flow path unit.
The mixing means has a rotating shaft part,
The movable wall portion rotates around a rotation shaft portion,
The rotating shaft portion is disposed downstream of the movable wall portion,
The vehicle air conditioning unit according to claim 1.
The movable wall portion further has a ventilation blocking portion for blocking ventilation between the cold air opening side and the warm air opening side on the upstream side surface thereof.
The vehicle air conditioning unit according to claim 1.
The ventilation blocking portion is a curved surface having an arc shape in cross section with the rotating shaft portion as a center,
4. The vehicle air conditioning unit according to claim 3, wherein the wall channel is any one of a curved surface, a flat surface, and a curved surface that is convex toward the rotating shaft portion.
The warm air guide channel has a warm air guide upstream end and a warm air guide downstream end,
The warm air guide upstream end is disposed on the warm air opening side of the movable wall portion,
The warm air guide downstream end is disposed on the cold air opening side of the movable wall portion,
The vehicle air conditioning unit according to any one of claims 1 to 4.
The warm-air guide channel has a substantially U-shaped cross-sectional shape, and the bottom of the warm-air guide channel is disposed on the movable wall portion of the mixing means. The vehicle air conditioning unit described.
The vehicle air conditioning unit according to any one of claims 1 to 6, wherein the warm air guide channel is disposed on the rotating shaft portion side of the ventilation block.
8. The apparatus further comprises distribution adjusting means for adjusting distribution between an amount of air flowing from the mixing chamber into the first blowing passage and an amount of air flowing into the second blowing passage. The vehicle air conditioning unit according to any one of the above.
The vehicle air conditioning unit according to any one of claims 1 to 8, wherein a temperature of air flowing through the first blowing passage is lower than a temperature of air flowing through the second blowing passage.
10. The air according to claim 1, wherein the air flowing through the first outlet channel flows toward at least one of a defrost outlet, a center vent outlet, and a side vent outlet. Air conditioning unit for vehicles.
The air conditioning unit for a vehicle according to any one of claims 1 to 10, wherein the air that has flowed through the second blowing channel flows toward the foot outlet.