JP2008094364A - Temperature mixing type heating, ventilation, and air-conditioning system relevant to high-temperature air channel and low-temperature air channel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve mixing of high-temperature air with low-temperature air in a vehicular HVAC system. <P>SOLUTION: A vehicular tempering and ventilating device 1 comprising an air inlet region 6 and an air outlet region 10 has a high-temperature air channel 40 and a low-temperature air channel 50 outside a casing 2, and the channel 40 has a high-temperature air inlet opening part 46 corresponding to a casing opening part 41 in a flow-in region thereof. A high-temperature air outlet opening part 48 is provided in a U-shaped leg part 43 of the high-temperature air channel 40, and the low-temperature air channel 50 is extended inside the casing 2, and an inlet opening part 51 of the low-temperature air channel 50 inside the air outlet region 10 over a temperature door 15 is arranged at an evaporator 8, and an outlet 52 of the channel 50 is provided under an instrument panel outlet 34. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle temperature control and ventilation apparatus and method (heating, ventilation and air conditioning system) as described in the preamble of claim 1.

  Heating, ventilation and air conditioning (HVAC) systems for automobiles regulate the passenger compartment temperature, ie, heat or cool the passenger compartment as required, and Helps to ventilate. For this purpose, the temperature-controlled air flow is directed into different areas of the vehicle. External air is supplied to the device by a fan, and this external air is sent to different locations in the passenger compartment. Incoming air is routed along these on various air conditioners on the way. The air is cooled outside the evaporator provided inside the casing of the heating, ventilation and air conditioning units, and the air is heated at the engine exhaust heat exchanger ventilation and, if necessary, at an additional heater. The The air outlet is, for example, connected to the foot well, through the opening provided in the instrument panel, to the center and the outer area of the passenger compartment, and in addition to the defroster outlet in view of the defrosting function of the windshield (windscreen). It leads to the lower interior of the windshield on the so-called exit. Ventilation can be achieved by circulating air in the passenger compartment without using external air.

  Many heating, ventilation and air conditioning units have the disadvantage that hot air (hot air) and cold air (cold air) flow parallel to each other within the provided mixing zone. Furthermore, in compact heating, ventilation and air conditioning units for vehicles, the mixing space for mixing hot and cold air is very narrow. Therefore, it is difficult to obtain sufficient mixing of the cold air flow and the hot air flow, resulting in an undesirable temperature stratification or stratification, and therefore there is a temperature difference between the individual outlets. growing. Thus, hot air is directed, for example, into a flow path leading to the exit of the instrument panel and / or the footwell region, and cold air that is just mixed with hot air reaches the defroster outlet. As a result, in certain operating modes, the instrument panel area is too heated, whereas the windshield, for example, is not adequately heated and defrosted, and the interior of the vehicle has a driver or A temperature stratification that is felt uncomfortable for the passengers occurs.

  In order to improve the mixing condition, an additional guide element is usually provided. Guide vanes are also provided, for example, inside the casing or on the temperature door, and in some cases, a raised portion (reflector) provided on the temperature door is used. This solution has the disadvantage that such guiding elements reduce the air flow and further increase the emission of noise.

  German Offenlegungsschrift 10 147 114 provides a vehicle compartment temperature regulation and ventilation system that can improve the mixing of cold and warm air. This device has an air inlet area and an air outlet area, starting from this air outlet area, the air flow being distributed into different vehicle areas by means of a distribution device. This device comprises a hollow casing, and a partition extends through the casing in the longitudinal axial direction, which in this embodiment is configured as a hollow channel of a cross member. The hollow channel divides the air flow path from the air inlet to the air outlet into two flow paths. One of these flow paths between the hollow channel and the casing wall is provided with an engine exhaust heat exchanger and, if necessary, an additional heater so that the air flowing along this flow path is heated. It has become so. A temperature door is provided downstream of both flow paths, and this temperature door controls the flow from the cold air flow path and the hot air flow path to the air outlet. The temperature door is arranged on the downstream side in the flow direction, and one of the air flow paths is closed at the end stop position, and the air in one air flow path is at least partially in the middle position and the other air flow path It is designed to be inclined or curved in the direction of the partition so as to be directed sideways or forward.

  In another advantageous embodiment of the device, an essentially U-shaped hot air bypass surrounds the casing in the vicinity of the air outlet in front of the next distribution casing. The hot air bypass with two U legs draws hot air along and over the opening from the hot air containment area of the casing through the opening provided in the casing, thus Direct into an area where air is supplied, for example, into the windshield or defroster outlet. The hot air is then routed through at least one opening provided at the base leg of the U and at least one corresponding opening provided in the outer casing. The advantage of this embodiment with a hot air bypass is that the bypass does not affect the air flow inside the casing because the bypass is located outside the casing, and in particular does not negatively affect the air flow due to noise emission. It is in that. The simplification in the design and manufacture of the hot air bypass allows hot air to be routed to a specific location, and hot air can be added specifically within a certain area.

  Under certain circumstances, it is useful to also send cold air separately behind the evaporator that cools the incoming air externally, and then blow this cold air out under the exit of the instrument panel. . Since some of the cold air can also be routed through a separate channel or bypass to the desired outlet, this embodiment also does not provide the necessary guide vanes or baffles in the area of flowing air. Specific temperature control is possible, especially the delivery of cold air. Thus, additional noise emission and reduced air flow are avoided.

  German Offenlegungsschrift 102613636 discloses a heating, ventilation and air conditioning unit casing comprising an evaporation device and a heating device, the casing having a mixing chamber, the air being Flow from the mixing chamber to the rear footwell and rear ventilation. The casing is provided with an air control device that controls the air flowing into the mixing chamber through the evaporator and the heating device by means of a mixing door. In addition, the apparatus comprises a separate stratification channel through which cold air can be sent to the rear ventilation area. This device is considered suitable, especially during the summer months.

German Patent Application Publication No. 10147114 German Patent Application No. 10261036

  One drawback is that only a certain area of additional cooling can be performed for a specific temperature control and layer formation. Consideration of specific requirements for temperature layer formation in winter, for example as a possibility of specific heating in certain areas of the passenger compartment, appears to be inadequate.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle passenger compartment temperature control and ventilation device that can improve the mixing of hot air and cold air with low noise emission and can form an appropriate layer for temperature. There is.

  According to the present invention, the improvement of the mixing of the cold air and the hot air and the formation of a suitable temperature layer provide a separate hot air channel extending around the casing outside the casing and a separate cold air channel inside the unit. Achieved by: The combination according to the invention of the separate hot air channel and the separate cold air channel allows the hot air flow and the cold air flow to flow in an intersecting direction without entering each other. A separate hot air channel draws a portion of the hot air from the air outlet area on the engine exhaust heat exchanger, directs the hot air around the casing in a bypass manner, and ultimately the hot air flow. To an air flow, for example, an air flow for windscreen defrosting. A separate cold air channel draws a portion of the cold air from the air outlet area on the evaporator and sends it directly to the area of the vehicle to be further cooled, e.g., the instrument panel outlet. Are mixed with the airflow present under these outlets.

  In a preferred embodiment of the invention, the channel size can be adjusted to control the amount of air flowing to the appropriate outlet.

  In a further preferred embodiment of the invention, the device with the above combination of separate hot air channels and separate cold air channels is supplemented with the temperature door of DE 10147114. This temperature door is arranged at the end stop position on the downstream side of the partition so as to close the high temperature air flow path that has passed through the heat exchanger or the low temperature air flow path that has passed over the evaporator, and in the direction of the partition. It is configured to be inclined or curved. In the intermediate position, in each case the air in the air channel is at least partially guided into the other air channel. Finally, this results in effective mixing and proper temperature layer formation in combination with two separate channels. Preferably, a bent air guide plate is arranged under the partition, which divides the hot air flow path into an upper flow path and a lower flow path, and thus a homogeneous air flow to the heat exchanger. Access is guaranteed.

  Preferably, the up to three walls of the additional separate channels are part of the heating, ventilation and air conditioning unit casing and are therefore made of the same material, with an additional covering completely covering each of the channels Make things.

  Further details, features and advantages of the present invention will become apparent upon reading the following description of example embodiments with reference to the accompanying drawings.

  The device 1 according to the invention comprises a basic casing 2 whose outer shape is irregular. As shown in FIG. 1, the basic casing 2 is configured as a hollow body, and a partition 3 extending along the entire basic casing 2 is provided in the middle of the basic casing 2 as a hollow body. The partition 3 is shaped as a hollow channel with a lower region 3a having a drop-like cross section, and therefore the partition 3 has a rounded lower region 3a. In addition, the lower region 3a of the partition 3 is bent in the flow direction. Engine exhaust heat exchanger 5 (and necessary) extending axially over the entire length of casing 2 and terminating at partition 3 and outer wall 4 between the concave side of curvature of lower region 3a of partition 3 and outer wall 4 of casing 2 Then, an additional heater (not shown in FIG. 1) is arranged. Preferably, the engine exhaust heat exchanger 5 is arranged substantially parallel to the upper integral wall portion 3 b of the partition 3. Below the partition 3, an air guide plate 3 c bent in the flow direction is provided, and this air guide plate passes through the flow path leading to the engine exhaust heat exchanger 5 in the form of drops below the air guide plate 3 c and the partition 3. It divides | segments into the upper side flow path 16a between the edge parts 3a, and the lower side flow path 16b between the air guide plate 3c and the outer wall 4, and this division | segmentation comes to ensure the homogeneous approach with respect to a heat exchanger. Yes. On the opposite side of the engine exhaust heat exchanger 5, ie on the opposite side with respect to the partition 3, the casing 2 is provided with an air inlet opening 6. The air inlet opening 6 has an essentially rectangular shape when viewed from above, and the air inlet opening 6 extends outwardly from the casing 2 in a box shape. In the box-shaped air inlet opening 6 defined by the box wall 7, an evaporator 8 is arranged in the direction of the casing 2 and an upstream filter 9 is arranged in the direction of the air inlet opening 6. An air outlet region 10 extending in the axial direction over the entire length of the casing 2 is provided above the integral wall end 3 b of the partition 3. This air outlet region 10 is also formed in an essentially rectangular shape extending in the longitudinal direction. A temperature door 15 is provided above the integral wall end 3 b of the partition 3 and between the partition 3 and the air outlet region 10. A partition 3 extending through the casing 2 divides the casing 2 from the air inlet 6 to the air outlet region 10 into a high-temperature air flow path 16 and a low-temperature air flow path 17 provided with an engine exhaust heat exchanger 5. . The temperature door 15 serves to block the hot air channel 16 or the cold air channel 17 or partially open or block both channels 16, 17.

  The casing 2 and the partition 3 are such that the incoming air or the incoming air flow according to the air inlet region 6 can divide itself, flow around the partition 3 and rejoin in parallel above the partition 3. The casing 2 in the direction of the air outlet region 10 above the partition 3 is tapered again or the width of the flow path is reduced again. The temperature door 15 is positioned in a region where the width above the partition 3 is narrow. The temperature door 15 extends in the axial direction through the entire casing 2 in alignment with the longitudinal extension of the partition 3, whereby the temperature door 15 has a shaft 18 as a center around which the temperature door 15 can rotate. . The shaft 18 passes through the casing wall at the axially forward end of the casing 2 and the end region of the shaft 18 of the temperature door 15 protrudes from the casing, so that the temperature door 15 can be operated from the outside. ing. The temperature door 15 is designed such that door wings 19 of the temperature door 15 are provided on both sides of the shaft 18. The temperature door wings 19 are configured to be inclined, curved or bent so that they form a small angle with respect to the partition 3 compared to the angle in the direction of the air outlet region 10. Various shapes of the temperature door 15 can be conceived. The temperature door 15 may be constructed in a roof shape with a C-shaped curve and a flat wing extending outward, and the shaft 18 extends in the vicinity of the ridge. The wing span of the door 15 between the outer longitudinal edges 20 of the door wing 19 is such that the longitudinal edge 20 of the door wing 19 abuts against the casing wall of the casing 2 at the end stop position of the door. The longitudinal edge 20 on the opposite side of the door wing 19 on the opposite side of the part 3 b is selected at or at the partition 3. Therefore, at the end stop position, the high temperature air flow path 16 or the low temperature air flow path 17 is such that only low temperature air flows in the area of the air outlet area 10 or only high temperature air flows in the area of the air outlet area 10. Will be blocked as a whole.

  In a preferred embodiment, the temperature door 15 is curved or inclined like a roof so that when the temperature door 15 is not in the end stop position, the flow path, in particular the cold air flow path 17, is affected. When the temperature door 15 is opened by an end stop that blocks cold air, a portion of the air flow following the hot air flow path 16 flows through the engine exhaust heat exchanger 5, i.e., this air flow passes through the inner partition. On the other hand, in particular, a portion of the low-temperature air that follows the low-temperature air flow path 17 in the region above the integral wall end 3 b is positively guided around the inner partition 3. Thus, cold air and warm air become mixed by collision and are then guided along on the door 15 in the direction of the air outlet region 10.

  A distributor 30 is provided above the air outlet region 10. This distributor 30 distributes the air flow over the outlets 32, 34, 36 of the channel system. This distribution device 30 is essentially shaped like a box. Inside the box-shaped structure, in the clockwise direction, a defroster outlet 32 that can be blocked by the door 31, an instrument panel outlet 34 and a door 35 that are arranged adjacent to each other in the box-shaped outlet that can be blocked by the door 33. A footwell outlet 36 is disposed on the lower surface of the box that can be shut off.

  In accordance with the present invention, a separate hot air channel 40 is arranged to increase the amount of air passing through the defroster outlet 32. A separate hot air channel 40 is positioned in the zone of the air outlet region 10. Within the zone of the air outlet region 10, the casing 2 has a substantially rectangular cross section and is adjacent to the wall of the casing 2 in the direction of the hot air flow path 16 in the region substantially above the engine exhaust heat exchanger 5. In the axial direction at the closed side, a casing opening 41 is provided in the casing wall in the inflow region of the separate hot air channel 40. A guide element 42 is arranged at the wall of the casing 2 above the casing opening 41. The guide element 42 allows at least a partial flow of rising hot air through the casing opening 41. The separate hot air channel 40 is U-shaped in cross section so that the separate hot air channel 40 is a U-shaped hollow body. This U-shaped hollow separate hot air channel 40 has a U base leg 43 and a U leg 44 branched from the U base leg 43 as shown in FIG. The distance between the U legs 44 or the width of the base legs 43 is such that the U base legs 43 have a length approximately equal to the length of the wide casing wall and the U legs 44 arranged in a substantially rectangular shape. The length is dimensioned to be approximately equal to the width of the narrow face end side casing wall. In the vicinity of the casing opening 41 and adjacent to the outer free edge 45, a separate hot air channel 40 has a casing opening 46 that is flush with the casing opening 41. The U base leg 43 has a hot air outlet opening 48 provided in the upper cover wall 47 of the base leg 43, and this hot air outlet opening is directed upward in line with the flow direction. . Accordingly, the wall of the dispensing device 30 located adjacent to the cover wall 47 is provided with a matching opening 49 above the cover wall 47. Thus, hot air that has flowed into the base leg 43 of the U through the openings 41 and 46 can flow into the region 32 and mix with the air present therein.

  FIG. 2 shows the flow path 53 in the hot air flow path 16 on the engine exhaust heat exchanger 5 along the flow path in the hot air channel 16 to the casing opening 41 in the inflow region of the hot air channel 40. FIG. 4 shows another flow path 53 through the hot air channel to the distribution casing 30, where the hot air flow path 53 is represented in the form of a flow vector. In addition to a separate hot air channel 40, the device 1 of the present invention comprises an inlet opening 51 and an outlet 52 and a separate cold air channel 50 extending into the interior of the casing 2. The flow path 54 in the cold air flow path 17 along the evaporator 80 to the separate cold air channel inlet opening 51 is also shown here in FIG. The inlet opening 51 of the channel 50 is positioned adjacent to the evaporator 8 at the height of the air outlet region 10 and therefore directly takes a portion of the air cooled outside the evaporator 8 and takes it into the instrument. Can be directed to the exit panel 34.

It is a cross-sectional side view of the apparatus of this invention. FIG. 2 is a diagram of the apparatus of FIG. 1 with the streamlines of the hot air channel and the cold air channel marked. FIG. 2 is a highly schematic cross-sectional view of the region of the hot air bypass viewed in the direction of the bypass cover wall for the apparatus of FIG. 1. FIG. 2 is a perspective view, partially from the side, of a separate hot air channel showing the hot air flow path within the hot air channel for the apparatus of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus of this invention 2 Basic casing 3 Partition 3a The lower area | region of the partition 3b The integral wall edge part of the partition 3c The air guide plate under the partition 3 4 Outer wall 5 Engine exhaust heat exchanger 6 Air inlet opening 7 Air inlet Box wall of opening 6 8 Evaporator 9 Upstream pollen filter 10 Air outlet area 15 Temperature door 16 Hot air flow path 16a Upper flow path 16b between air guide plate 3c and partition 3 Air guide plate 3c and outer wall 4 Lower flow path 17 low temperature air flow path 18 central shaft of temperature door 15 19 door wing of temperature door 15 20 outer longitudinal edge of door wing 30 distribution casing above air outlet region 10 of defroster outlet 32 Shut-off door 32 Defroster outlet 33 Door for instrument panel outlet 34 Instrument panel outlet 35 Door for twell outlet 36 36 Footwell outlet 40 Separate hot air channel 41 Casing opening at inflow region of separate hot air channel 40 Guide element 43 Base leg of U-shaped tube of hot air channel 44 Hot air U-tube leg of channel 40 45 Outer free edge of U leg 46 Inlet opening of hot air channel 40 47 Upper cover wall of base leg 43 48 Outlet opening of hot air channel 40 provided in cover wall 47 49 Matched opening at 48 of distributor 30 50 Separate cold air channel 51 Separate cold air channel 50 inlet opening 52 Separate cold air channel 50 outlet 53 Hot air flow path 54 Inlet opening The path of the flow of cold air up to 51

Claims (4)

Vehicle temperature control and ventilation device (1) with an air inlet opening (6) and an air outlet region (10), wherein the air flow differs from said air outlet region using a distribution casing (30) Distributed within the area,
The device (1) comprises a basic casing (2) configured to be hollow, and the partition (3) has the partition (3) from the air inlet opening (6) to the air outlet region (10). The basic casing extends in the axial direction and in the longitudinal direction so as to divide the air flow path into two flow paths (16, 17),
An engine exhaust heat exchanger (5) is disposed in one of the flow paths (16) between the partition (3) and the wall of the basic casing (2), and the hot air flow path (16). The air flowing along the
A temperature door (15) for controlling the inflow of air from the high temperature air flow path (16) and / or the flow path (17) to the air outlet region (10),
A separate passable hot air channel (40) and a separate passable hot air channel (50) are provided,
The hot air channel (40) located outside the basic casing (2) is shaped as a U-shaped hollow body and is upstream of the next distribution casing (30) in the air outlet region (10). Surrounding the casing (2),
The hot air channel (40) has a hot air inlet opening (46) that coincides with a casing opening (41) provided in the basic casing (2) in the inflow region of the hot air channel (40). And
The casing opening (41) is located immediately downstream of the engine exhaust heat exchanger (5) and the U base leg (43) of the separate hot air channel (40) is at least one hot. An air outlet opening (48),
The hot air outlet opening (48) coincides with an opening (49) provided in the adjacent wall of the distribution casing (30) under the defroster outlet (32);
The cold air channel (50) extends inside the basic casing (2);
An inlet opening (51) of the cold air channel (50) in the air outlet region (10) above the temperature door (15) is located directly in the evaporator (8),
An outlet (52) of the separate cold air channel (50) is provided under the instrument panel outlet (34);
apparatus.   The temperature door (15) of the partition (3) is disposed downstream in the flow direction, and the temperature door (15) is closed at one of the air flow paths (16, 17) at the end stop position. And at the intermediate position, in the direction of the partition (3) so that the air in one air flow path is at least partially directed sideways or forward into the other air flow path (17, 16). The apparatus of claim 1, wherein the apparatus is configured in a tilted or curved state.   An air guide plate bent in the flow direction of the high-temperature air is disposed under the partition (3), and the air guide plate passes the high-temperature air flow path (16) into two flow paths (16a). , (16b) according to claim 1 or 2.   Up to three walls of the additional separate channel (40, 50) may be part of the basic casing (2), and an additional cover completely connects the channel (40, 50). The device according to claim 1, wherein the device is one.

Images