JP4466532B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner configured to rotate a heat exchanger for heating, and is specifically suitable for a vehicle air conditioner configured to rotate a hot water heating heat exchanger.

  Conventionally, as a temperature adjustment method for a vehicle air conditioner, an air mix type in which the air volume ratio between cold air and hot air is adjusted by an air mix door to adjust the temperature of air blown into the vehicle interior is typical.

  In this air mix type vehicle air conditioner, it has been proposed that the hot water heating heat exchanger itself is configured to be rotatable so that the heating heat exchanger also serves as an air mix door ( For example, see Patent Document 1).

  According to this, the air mix door can be eliminated, and at the time of maximum cooling, there is an advantage that the amount of cold air can be increased by rotating the heat exchanger for heating to a position where the air flow resistance of the cold air does not flow.

Specifically, in Patent Document 1, a rotating shaft is arranged at one end of the heating heat exchanger, and the power of the driving motor is transmitted to the rotating shaft by gear coupling, so that one end of the heating heat exchanger is arranged. The entire heat exchanger for heating is driven to rotate around the part.
JP 2001-47845 A

  By the way, according to the experiments and examinations of the present inventors, the temperature of the heating heat exchanger downstream side varies greatly in the direction of the rotation axis of the heating heat exchanger. It was found that the temperature variation of was large.

  This defect will be described in detail with reference to FIGS. 8 and 9 are prototypes of the present inventor and are not publicly known. 8 and 9 show a temperature control state in which the heating heat exchanger 15 is rotated about the rotation shaft 16 to an intermediate position between the maximum heating position and the maximum cooling position. 8 and 9, a seal rib 20 is provided on the leeward side of the heat exchanger 15 for heating. As shown in FIG. 9B, the seal rib 20 protrudes in a frame shape from the inner wall surface of the case 11 toward the air passage in the case 11.

  During maximum heating, the entire circumference of the peripheral edge of the heating heat exchanger 15 is pressed against the frame-shaped seal rib 20. As a result, the entire amount of the blown air passes through the heating heat exchanger 15 and is heated to become warm air, which flows through the central opening 20a of the seal rib 20 to the downstream side.

On the other hand, in the temperature control state, the heating heat exchanger 15 is separated from the seal rib 20, so that a part of the cold air after passing through the cooling heat exchanger 13 is an arrow in FIGS. 8C and 9A. As shown in c, the heat exchanger 15 for heating is bypassed and flows into the central opening 20a of the frame-shaped seal rib 20. Further, the remaining portion of the cold air is heated by passing through the heat exchanger 15 for heating and becomes hot air d. Here, of the leeward side of the heat exchanger 15 for heating, in the rotation axis direction of the heat exchanger 15 for heating. In the left and right side portions, cold air flows along the left and right side surfaces of the seal rib 20 toward the rotating shaft 16 of the heating heat exchanger 15 as indicated by an arrow c1 in FIGS.

  However, since the dead end is formed between the rotating shaft 16 of the heating heat exchanger 15 and the left and right sides of the seal rib 20 as shown in FIG. 8B, the cold air flow c1 along the seal rib 20 has a place to go. Lost and the direction is changed in the direction of the rotation axis (lateral direction) of the heat exchanger 15 for heating as indicated by an arrow c2 in FIGS.

  The direction-changed cold air flow c2 flows into the left and right sides of the core portion of the heating heat exchanger 15 (the left and right sides of the rotation axis direction), so that the ratio of the cold air flow in the left and right sides of the core portion of the heating heat exchanger 15 Becomes larger than the cold air ratio in the central portion.

  For this reason, as shown in FIG.8 (d), the air temperature of the core part of the heat exchanger 15 for a heating generate | occur | produces the dispersion | variation in which the left and right both sides are low and the center part is high. This causes variations in the temperature of the air blown into the passenger compartment, impairing the comfort of the air conditioning in the passenger compartment.

  Specifically, when the axial direction of the rotating shaft 16 of the heat exchanger 15 for heating is in the left-right direction of the vehicle as shown in FIG. 8A, the temperature of air blown to the center in the left-right direction of the vehicle (center The face blowing air temperature) is high, and the blowing air temperature (side face blowing air temperature) to the left and right sides in the vehicle left-right direction is low.

  An object of this invention is to reduce the temperature dispersion | variation in the rotating shaft direction of the heat exchanger for rotary heating in view of the said point.

In order to achieve the above object, in the present invention, when the heating heat exchanger (15) that is rotatably arranged around the rotating shaft (16) in the air conditioning case (11) rotates to the maximum heating position. The sealing surface (20) with which the peripheral portion of the heat exchanger for heating (15) contacts is formed inside the air conditioning case (11),
An opening (20a) through which air can pass is formed at the center of the sealing surface (20),
Guide means (25) are arranged in the air-conditioning case (11) on the windward side of the heat exchanger for heating (15) and on the left and right sides in the axial direction of the rotating shaft (16),
The guide means (25) is characterized by being configured to guide the air toward the opening (20a) so that the air flows while avoiding the sealing surface (20).

  According to this, as illustrated in FIG. 2A, air flows while avoiding the seal surfaces (20) on both the left and right sides in the rotation axis direction, so that the cold air flow indicated by arrows c1 and c2 in FIGS. 8 and 9 can be eliminated. . Therefore, it can suppress that the cold-air ratio of the right-and-left both sides of the rotating shaft direction in an opening part (20a) becomes high compared with a center part, and the temperature distribution of the blowing air from an opening part (20a) can be equalize | homogenized.

  Moreover, the guide means (25) according to the present invention is disposed on the windward side of the heat exchanger for heating (15) and only guides the cold air having a small specific volume before heating. There is an advantage that an increase in ventilation resistance (pressure loss) can be suppressed to a small amount as compared with the case where guide means for promoting the mixing of cold and hot air is installed on the leeward side of the exchanger (15).

  In the present invention, specifically, the guide means is close to at least the seal surface (20) in the windward air passage (18) located on the windward side of the rotational operation region of the heating heat exchanger (15). What is necessary is just to form in the site | part which carries out.

  Specifically, the guide means of the present invention may be constituted by a passage restricting portion (25) for restricting the windward passage area of the heating heat exchanger (15).

  The passage restricting portion (25) is preferably formed so as to increase the amount of passage restriction in a taper shape from the upstream side to the downstream side of the air flow. According to this, an air flow can be smoothly guided toward the opening part (20a) of the center part of a sealing surface (20), without raise | generating a sharp curve in a channel | path throttle part (25).

  The passage restricting portion (25) may be configured such that the amount of passage restriction becomes a constant amount from the upstream side to the downstream side of the air flow.

  Moreover, you may comprise the guide means of this invention by the guide-shaped part which orient | assigns the airflow of the windward side of the heat exchanger for heating (15) to an opening part (20a).

In the present invention, specifically, the end (15a) on the rotating shaft (16) side of the heating heat exchanger (15) is located on the leeward side, and the heating heat exchanger (15) The heating heat exchanger (15) is arranged in the air conditioning case (11) so that the end (15b) opposite to the rotating shaft (16) is located on the windward side,
The sealing surface (20) is arranged on the leeward side with respect to the heating heat exchanger (15).

In the present invention, specifically, the end (15a) on the rotating shaft (16) side of the heating heat exchanger (15) is located on the windward side, and the heating heat exchanger (15) The heating heat exchanger (15) is arranged in the air conditioning case (11) so that the end (15b) opposite to the rotating shaft (16) is located on the leeward side,
The sealing surface (20) may be disposed on the windward side of the heating heat exchanger (15), and the guide means (25) may be disposed further on the windward side of the sealing surface (20).

  Moreover, the sealing surface of this invention is specifically comprised by the sealing rib (20) which protrudes in a frame shape from the inner wall face of an air-conditioning case (11) so that an opening part (20a) may be enclosed.

  In addition, the code | symbol in the bracket | parenthesis of each said means and each means as described in a claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
FIG. 1 is a schematic cross-sectional view of an indoor air conditioning unit of a vehicle air conditioner equipped with a rotary heating heat exchanger according to the first embodiment, and FIG. 2 is a rotary heating heat exchanger forming the main part of the first embodiment. FIG. 2A is a schematic cross-sectional view of a configuration in the vicinity, and FIG. 2A is a schematic cross-sectional view from the windward side passage of the rotary heating heat exchanger to the outlet passage to the vehicle interior, and FIG. 2A is a cross-sectional view taken along the line A-B in FIG. 2A, and FIG. 2D is a cross-sectional view taken along the line C-C in FIG. 2B. It is.

  First, the outline of the indoor air conditioning unit 10 of the vehicle air conditioner will be described with reference to FIG. 1. Located in the center. In addition, each arrow before and behind in FIG. 1 shows the direction in a vehicle mounting state. The vertical direction in FIG. 1 is the vehicle left-right (width) direction.

  The indoor air-conditioning unit 10 includes a resin air-conditioning case 11 that forms a passage for air flowing toward the passenger compartment. The air-conditioning case 11 is actually formed as a plurality of divided case bodies for convenience in resin molding, assembly of built-in parts, and the like, and the plurality of divided case bodies are integrated by fastening means such as screws and clips. The air-conditioning case 11 is configured by fastening to.

  And in this embodiment, it is the structure which has arrange | positioned the air blower part 12 integrally in the upper part of the vehicle front side among the air-conditioning cases 11. FIG. The blower unit 12 is configured to rotationally drive a centrifugal blower fan 12a by a motor (not shown). An inside / outside air switching box (not shown) is connected to the suction port of the blower fan 12a, and the introduced air (inside air or outside air) from the inside / outside air switching box is sent from the top to the bottom as indicated by the arrow a by the blower fan 12a. It is designed to blow air toward you.

  An evaporator 13 serving as a heat exchanger for cooling is disposed in a lower portion of the air conditioning case 11 on the front side of the vehicle. Here, the outer shape of the evaporator 13 is a rectangular thin shape, and the entire amount of blown air from the blower unit 12 passes as shown by an arrow b. As is well known, the evaporator 13 is a low pressure side heat exchanger of the vapor compression refrigeration cycle, and cools the passing air by absorbing heat from the passing air indicated by the arrow b and evaporating the low pressure refrigerant.

  A drain port 14 is provided at the lowest part of the bottom surface of the air conditioning case 11, and condensed water generated in the evaporator 13 is drained from the drain port 14 to the outside of the passenger compartment.

  In the air conditioning case 11, a heater core 15 is disposed on the leeward side of the evaporator 13. More specifically, the heater core 15 is disposed on the vehicle rear side of the evaporator 13 and in an upper portion. Here, the heater core 15 is a heat exchanger for heating that heats air using hot water (engine cooling water) from a vehicle engine (not shown) as a heat source fluid.

  The outer shape of the heater core 15 is also a rectangular thin shape. One end portion 15a of the rectangular outer shape, more specifically, the rotary shaft 16 is set at the upper end portion 15a. The air-conditioning case 11 is rotatably supported.

  In the example of FIG. 1, the rotating shaft 16 is disposed adjacent to the rear side of the upper end portion of the evaporator 13. A windshield wall 17 for maximum cooling is integrally formed in the air conditioning case 11 between the evaporator 13 and the heater core 15. The wind shielding wall 17 is formed in a plate shape that hangs vertically from a portion between the upper end portion of the evaporator 13 and the upper end portion (end portion on the rotating shaft 16 side) 15a of the heater core 15.

  The plate-shaped wind shielding wall 17 is formed in the entire area inside the air conditioning case 11 with respect to the vehicle left-right direction (the direction perpendicular to the plane of FIG. 1). Coupled to the side wall.

  The plate-shaped wind shielding wall 17 is formed in substantially the same area as the heater core 15 so as to cover the entire windward surface (left side surface in FIG. 1) of the heater core 15. A predetermined gap is set between the lower end portion of the wind shielding wall 17 and the lower end portion 15b of the heater core 15 and the bottom surface portion of the air conditioning case 11, and the air passage 18 on the upper side of the heater core is formed by the predetermined gap. . That is, the air passage 18 is formed in a region on the windward side with respect to the rotation operation region of the heater core 15.

 The heater core 15 is rotated to a broken line position MC along the leeward side surface (the right side surface in FIG. 1) of the wind shielding wall 17 during maximum cooling. In the maximum cooling position MC, the wind shielding wall 17 fully closes the windward surface of the heater core 15 and prevents the air on the leeward side of the evaporator 13 from passing through the core portion of the heater core 15.

  Accordingly, since the entire amount of the air passing through the evaporator (cold air) flows by bypassing the heater core 15 as indicated by the arrow c, the maximum cooling performance can be exhibited. For this reason, the air passage 18 on the upper side of the heater core acts as a heater core bypass passage during maximum cooling.

  The core portion of the heater core 15 has a well-known configuration, and will be described with reference to FIG. 9C described above. A large number of tubes 15c having a flat cross section through which hot water flows are arranged in parallel. Corrugated fins 15d are disposed between each other, the tubes 15c and the corrugated fins 15d are joined together, and the air on the leeward side of the evaporator 13 passes through the gap between the tubes 15c and the corrugated fins 15d. .

  Both ends of the tube 15c in the longitudinal direction communicate with the tank 15e, and the tank 15e distributes and collects hot water to the multiple tubes 15c. In FIG. 9C, only the tank 15e on one end side of the tube 15c is shown, and the illustration of the tank 15e on the other end side is omitted.

  By the way, in this embodiment, the lower end part (end part on the opposite side to the rotating shaft 16) 15b of the heater core 15 approaches the upwind air passage 18 formed on the lower end side of the wind shielding wall 17, and the heater core 15 Since the heater core 15 is arranged so that the upper end portion (end portion on the rotating shaft 16 side) 15a of the heater core 15 moves away from the windward air passage 18, the lower end portion 15b of the heater core 15 becomes the windward end portion, and the upper end portion 15a of the heater core 15 Becomes the leeward side end.

  Seal ribs 20 are formed on the leeward side of the heater core 15 on the inner wall surface of the air conditioning case 11. The seal rib 20 is integrally formed on the inner wall surface of the air conditioning case 11 and constitutes a case-side seal surface during maximum heating.

  Specifically, the seal rib 20 projects in a frame shape from the inner wall surface of the air conditioning case 11 toward the inside of the air conditioning case 11. The protruding shape of the frame shape of the seal rib 20 is as shown in FIG. 2A, and a central opening 20a is opened at the center of the protruding shape of the frame shape.

  During maximum heating, the heater core 15 is rotated to the one-dot chain line position MH in FIG. 1, and the rectangular peripheral edge of the heater core 15 is pressed against the frame-like protruding shape of the seal rib 20. Thereby, at the time of maximum heating, the heater core bypass passage in which the air passage 18 and the central opening 20a directly communicate with each other is blocked, and the space between the lower end portion 15b of the heater core 15 and the inner wall surface of the bottom surface of the air conditioning case 11 directly enters the central opening 20a. The bypass bypass air flow (cold air flow) c is blocked.

  For this reason, since the whole quantity of blowing air in the air conditioning case 11 passes through the core part of the heater core 15 and is heated, the maximum heating performance can be exhibited. The warm air d that has passed through the core portion of the heater core 15 flows through the central opening 20a of the seal rib 20 to the leeward side.

  Moreover, the solid line position in FIG. 1 of the heater core 15 is an example of an intermediate opening (intermediate rotation position) at the time of temperature control. Since the flow on the side bypasses the heater core 15 as indicated by the arrow c, and the upper flow of the evaporator passing air (cold air) passes through the heater core 15 and is heated as indicated by the arrow d ′, It becomes hot air d.

  Therefore, by adjusting the rotation position of the heater core 15, the air volume ratio between the cold air that bypasses the heater core 15 and the hot air that passes through the heater core 15 can be adjusted to continuously adjust the temperature of the air blown into the vehicle interior.

  The cold air that bypasses the heater core 15 and the warm air that passes through the heater core 15 both pass through the central opening 20a of the seal rib 20 and are mixed in the upper region 21 of the seal rib 20, resulting in conditioned air at a desired temperature. Later, it flows into each of the outlet openings 22, 23, 24.

  Next, the arrangement of the blowout openings 22, 23, and 24 for blowing air to each part of the vehicle interior will be described. The blowout openings 22, 23, and 24 are arranged in the vehicle rear side portion of the blower unit 12 in the air conditioning case 11.

  The defroster opening 22 is disposed on the upper surface of the air conditioning case 11 and is connected to a defroster outlet on the upper surface of the vehicle instrument panel via a defroster duct (not shown). Blow out.

  The face opening 23 is disposed at a rear side of the vehicle with respect to the defroster opening 22. Specifically, as shown in FIG. 2A, the face opening 23 includes a center face opening 231 located at the center in the vehicle left-right direction and side face openings located on both the left and right sides in the vehicle left-right direction. And H.232.

  A center face duct 231a is connected to the center face opening 231. A front end outlet (center face outlet) of the center face duct 231a is disposed at the center in the left-right direction of the vehicle instrument panel (instrument panel). Air is blown out to the occupant's face.

  A side face duct 232a is connected to the side face opening 232, and a front end outlet (side face outlet) of the side face duct 232a is disposed at both left and right ends of the vehicle instrument panel (instrument panel). Air is blown out to the passenger's face side or vehicle side window glass side.

  The foot opening 24 is disposed on the left and right side walls of the air conditioning case 11 and blows air to the feet of the occupant through a foot duct (not shown). The defroster opening 22, the face opening 23, and the foot opening 24 are opened and closed by a blowing mode door (not shown).

  Next, the passage restricting portion 25 formed in the windward air passage 18 of the heater core 15 will be described. As shown in FIG. 2A, the passage restricting portion 25 has a width dimension W <b> 1 in the heater core rotation axis direction (vehicle left-right direction) of the windward air passage 18 of the heater core 15 smaller than the width dimension W <b> 2 of the heater core 15. The width dimension W1 is substantially the same as or slightly smaller than the width dimension W3 of the central opening 20a of the seal rib 20.

  3A and 3B exemplify a specific form of the passage restricting portion 25. As shown in FIG. 3B, the passage restricting portion 25 has air below the heater core 15 in the vehicle vertical direction. As shown in FIG. 3A, the passage restricting portion 25 is formed so as to protrude inward from the left and right side wall portions of the air conditioning case 11 with respect to the vehicle left-right direction. Is done.

  Further, as shown in FIG. 3A, the left and right passage restricting portions 25 are directed from the upstream side of the air flow (the lower end side of the wind shield wall 17) to the downstream side (the lower side of the rear side surface of the seal rib 20). Thus, the amount of protrusion in the inward direction is gradually increased in a tapered shape. Thereby, the amount of restriction of the passage width dimension of the air passage 18 gradually increases in a taper shape, and the amount of restriction is maximized immediately before the seal rib 20. In other words, the passage width dimension W1 of the air passage 18 is almost the same as or slightly smaller than the width dimension W3 of the central opening 20a of the seal rib 20 at a position immediately before the seal rib 20.

  As shown in FIG. 3A, both end portions in the axial direction of the rotating shaft 16 pass through the left and right side walls of the air conditioning case 11 and protrude to the outside of the air conditioning case 11. Are connected to the hot water inlet / outlet mechanism 26 outside the air conditioning case 11.

  The hot water inlet / outlet mechanism 26 includes a rotary hot water inlet side pipe (not shown) and a hot water outlet side pipe (not shown) connected to the rotary shaft 16 side, and a fixed side fixed to the air conditioning case 11 side. It has a hot water inlet side pipe (not shown) and a hot water outlet side pipe (not shown), and these pipes are fitted coaxially so that the rotating side pipe can rotate with respect to the fixed side pipe. Consists of a combined coaxial double piping mechanism. Hot water circulates in the heater core 15 through the hot water inlet / outlet mechanism 26 and the hot water passage portion of the rotating shaft 16.

  Further, the other end (right end) of the rotating shaft 16 is connected to the rotation driving mechanism 27 outside the air conditioning case 11. The rotation drive mechanism 27 includes a power transmission mechanism such as a link mechanism and a gear mechanism connected to the rotation shaft 16 and a drive mechanism such as a servo motor that applies a rotation driving force to the rotation shaft 16 through the power transmission mechanism. Composed. The rotation drive mechanism 27 may be a manual mechanism that is operated by the manual operation force of the occupant.

  Next, the operation of this embodiment will be described. When the heater core 15 is rotated about the rotation axis 16 by the rotation drive mechanism 27 and the heater core 15 is rotationally displaced to the broken line position MC in FIG. 1, the wind shielding wall 17 covers the entire windward surface of the heater core 15 as described above. Closed to prevent the air on the leeward side of the evaporator 13 from passing through the core portion of the heater core 15.

  Therefore, if the refrigeration cycle and the blower 16 are operated, the entire amount of the cold air cooled by the evaporator 13 flows by bypassing the heater core 15 as indicated by the arrow c, so that the maximum cooling performance can be exhibited.

  By the way, at the maximum cooling position MC of the heater core 15, the core surface of the heater core 15 is arranged orthogonal to the cold air flow c after passing through the evaporator, so that the cold air flow c is sufficiently separated from the core surface of the heater core 15. It flows through the part.

  For this reason, even if the hot water valve in the hot water circuit of the heater core 15 is abolished and the hot water always flows through the heater core 15 when the engine is operating, the cold air temperature rises (decreases the maximum cooling performance) due to heat radiation from the heater core 15. Slightly reduced. Therefore, it is possible to reduce the cost of the air conditioner by using a system configuration without a hot water valve.

  On the other hand, when the heater core 15 is rotated to the one-dot chain line position MH in FIG. 1, the rectangular peripheral edge of the heater core 15 is pressed against the frame-like protruding shape of the seal rib 20 as described above. As a result, the state in which the air passage 18 and the central opening 20a of the seal rib 20 directly communicate with each other is blocked, so that the air flow (cold air flow) c directly from the air passage 18 to the central opening 20a of the seal rib 20 disappears. .

  For this reason, since the whole quantity of blowing air after passing through the evaporator flows into the core portion of the heater core 15 and is heated, the maximum heating performance can be exhibited.

  On the other hand, when the heater core 15 is rotated to the intermediate opening position (intermediate rotation position) indicated by the solid line position in FIG. 1, the lower side flow of the evaporator passing air (cold air) is as indicated by the arrow c as described above. In the evaporator passing air (cold air), the upper flow flows through the heater core 15 as indicated by arrow d ′ and is heated to become hot air d.

  Therefore, by adjusting the rotation position of the heater core 15, the air volume ratio between the cold air that bypasses the heater core 15 and the hot air that passes through the heater core 15 can be adjusted to continuously adjust the temperature of the air blown into the vehicle interior.

  The behavior of the flow of the cold air and the warm air at the intermediate opening position (intermediate rotation position) of the heater core 15 will be described in further detail. In the present embodiment, the passage restricting portion 25 is formed in the upwind air passage 18 of the heater core 15. Then, the width dimension W1 of the windward air passage 18 in the heater core rotation axis direction (the vehicle left-right direction) is narrowed to be substantially the same as or slightly smaller than the width dimension W3 of the central opening 20a of the seal rib 20.

  The passage restricting portion 25 can guide the cold air flow in the upwind air passage 18 toward the central opening 20a of the seal rib 20 as indicated by an arrow c in FIG. Therefore, it is possible to suppress the cool air in the upwind air passage 18 from flowing along the left and right protruding surfaces of the seal rib 20.

  That is, according to the present embodiment, by forming the passage restricting portion 25, the cold air is guided toward the central opening 20a so that the cold air in the windward air passage 18 flows avoiding the left and right protruding surfaces of the seal rib 20. Can do. As a result, the cold air flow (see the broken line arrow c1 in FIG. 2B) along the left and right protruding surfaces of the seal rib 20 can be eliminated, so that the central opening 20a is caused by this cold air flow (broken line arrow c1). It is possible to eliminate the fact that the temperature of the air blown from the lower side of the left and right sides is lower than that of the central part. Therefore, the temperature distribution of the air blown from the central opening 20a can be made substantially uniform in the left-right direction of the vehicle as shown in FIG. FIG. 2D shows that the temperature decreases sequentially from the uppermost shaded portion toward the lowermost white portion, and each temperature region extends uniformly in the left-right direction of the vehicle.

  As described above, since the temperature distribution of the blown air can be made substantially uniform in the left-right direction of the vehicle, a face mode is set in which air is blown out simultaneously from the center face opening 231 and the side face opening 232 as shown in FIG. The air temperature from the center face opening 231 and the air temperature from the side face opening 232 can be made substantially equal.

  By the way, the passage restricting portion 25 according to the present embodiment is formed in the windward air passage 18 of the heater core 15 and serves to guide cold air (low temperature air) before the heater core 15 is heated. 11 is advantageous for suppressing an increase in ventilation resistance (pressure loss).

  If the guide means is formed in the leeward air passage of the heater core 15, it is necessary to improve the mixing of the warm air (hot air) after heating the heater core 15 and the cool air. Is sufficiently larger than the cold air, and in order to mix the cold air well with the hot air having a large specific volume, a guide means for greatly changing the flow of the hot air or the cold air is required. Ventilation resistance (pressure loss) is inevitably increased.

  However, according to the present embodiment, the passage restricting portion 25 only needs to guide the cold air having a small specific volume before the heater core 15 is heated, and guides the cold air corresponding to the width dimension of the left and right protruding surfaces of the seal rib 20. Just do it. For this reason, the throttle amount W0 (see FIG. 2A) of the passage restricting portion 25 is relatively small, and an increase in ventilation resistance (pressure loss) due to the formation of the passage restricting portion 25 can be suppressed to a very small amount.

  Further, as shown in FIG. 3A, the passage restricting portion 25 is formed so that the amount of protrusion of the air flow from the upstream side toward the downstream side gradually increases in a taper shape. The cool air in the upwind air passage 18 can be smoothly guided toward the central opening 20a of the seal rib 20 without causing a sharp bend in the passage restricting portion 25.

(Second Embodiment)
In the first embodiment, as shown in FIG. 3A, the throttle amount of the passage width dimension of the windward air passage 18 of the heater core 15 is reduced from the upstream side (lower end side of the wind shielding wall 17) to the downstream side ( Although the passage restricting portion 25 is formed so as to gradually increase in a tapered shape toward the seal rib 20 side, in the second embodiment, as shown in FIG. The passage restriction portion 25 is formed so that the restriction amount of the passage width dimension of 18 becomes a constant amount from the upstream side of the air flow (the lower end side of the wind shielding wall 17) toward the downstream side (the rear side of the seal rib 20). ing.

  That is, in the second embodiment, the passage width dimension of the windward air passage 18 of the heater core 15 is uniformly reduced not only on the downstream side (the seal rib 20 side) but also on the upstream side (the lower end side of the wind shielding wall 17). ing. Even if it does in this way, the effect similar to 1st Embodiment can be exhibited in the surface of equalization of blowing air temperature distribution.

  FIG. 5 shows a comparative example of the present invention, in which the passage restricting portion 25 in the upwind air passage 18 of the heater core 15 is formed in the opposite form to the first embodiment. That is, the amount of restriction of the passage width dimension of the windward air passage 18 of the heater core 15 is maximized on the upstream side of the air flow (the lower end side of the wind shielding wall 17), and is restricted toward the downstream side (the seal rib 20 side). The passage restricting portion 25 is formed so that the amount gradually decreases in a tapered shape.

  With such a configuration, even if the passage restricting portion 25 is formed, a cold air flow (see broken line arrow c1 in FIG. 2B) is generated along the left and right protruding surfaces of the seal rib 20, so that the blown air Unable to achieve uniform temperature distribution.

  Therefore, it is important for the passage restricting portion 25 to be formed at least in a portion close to the seal rib 20 in the windward air passage 18 of the heater core 15 in order to make the blown air temperature distribution uniform.

(Third embodiment)
In the first and second embodiments, the end 15a of the heater core 15 on the rotating shaft 16 side is disposed above the wind shield wall 17, and the end 15b of the heater core 15 opposite to the rotating shaft 16 is disposed on the wind shield wall 17. Since the end 15a of the heater core 15 on the rotating shaft 16 side is located on the leeward side, the end 15b of the heater core 15 opposite to the rotating shaft 16 is located on the upwind side. However, in the third embodiment, an arrangement configuration opposite to that of the first embodiment is adopted as shown in FIG.

  That is, in the third embodiment, the end 15 a of the heater core 15 on the rotating shaft 16 side is disposed below the wind shield wall 17, and the end 15 b of the heater core 15 opposite to the rotating shaft 16 is disposed on the wind shield wall 17. It is arranged on the upper side. For this reason, the end portion 15a on the rotating shaft 16 side of the heater core 15 is positioned on the windward side, and the end portion 15b on the opposite side of the rotating shaft 16 of the heater core 15 is positioned on the leeward side.

  Accordingly, the seal rib 20 is disposed on the windward side with respect to the heater core 15. Therefore, in the third embodiment, the passage restricting portion 25 is formed further on the windward side of the seal rib 20. By forming the passage restricting portion 25, the third embodiment can similarly exhibit the effect of uniforming the blown air temperature distribution in the heater core rotation axis direction (the vehicle left-right direction).

(Fourth embodiment)
In the first and second embodiments, the wind shielding wall 17 is disposed between the evaporator 13 and the heater core 15, and air flow into the heater core 15 is prevented by the wind shielding wall 17 during maximum cooling. The embodiment relates to a heater core arrangement configuration that eliminates the wind shielding wall 17 as shown in FIG.

  In 4th Embodiment, the heater core 15 is arrange | positioned along the back wall 11a which is located in the vehicle rear side among air conditioning cases 11, and is extended in an up-down direction. Specifically, the rotating shaft 16 (end portion 15a) of the heater core 15 is disposed above the rear wall 11a, and the end portion 15b opposite to the rotating shaft 16 of the heater core 15 is positioned below the rear wall 11a. Thus, the heater core 15 is arranged.

  Therefore, the end portion 15a on the rotating shaft 16 side of the heater core 15 is positioned on the leeward side, and the end portion 15b on the opposite side of the rotating shaft 16 of the heater core 15 is positioned on the leeward side.

  Also in the fourth embodiment, by forming the passage restricting portion 25 in the windward air passage 18 of the heater core 15, it is possible to similarly exhibit the effect of making the blown air temperature distribution uniform in the heater core rotation axis direction (vehicle left-right direction). .

  According to the fourth embodiment, there is an advantage that the ventilation resistance (pressure loss) in the air conditioning case 11 can be reduced by eliminating the wind shielding wall 17, but on the other hand, at the maximum cooling when the heater core 15 is rotated to the broken line position MC, Since the cool air flows along the core surface of the heater core 15, if the hot water always flows through the heater core 15, the amount of heat released from the heater core 15 to the cool air increases and the maximum cooling performance is deteriorated.

  For this reason, in the arrangement of the fourth embodiment, it is necessary to install a hot water valve in the hot water circuit of the heater core 15 and close the hot water valve to shut off the hot water circulation to the heater core 15 during maximum cooling. . That is, in the fourth embodiment, a hot water valve is essential, and the cost increases accordingly.

(Other embodiments)
The present invention is not limited to the above embodiment, and can be variously modified as follows.

  (1) In 4th Embodiment, the rotating shaft 16 (end part 15a) of the heater core 15 is arrange | positioned above the back wall 11a of the air-conditioning case 11, and the edge part 15b on the opposite side to the rotating shaft 16 of the heater core 15 is back. The heater core 15 is disposed so as to be positioned below the wall 11a. On the contrary, the rotating shaft 16 (end portion 15a) of the heater core 15 is disposed below the rear wall 11a of the air conditioning case 11. The heater core 15 may be arranged so that the end 15b of the heater core 15 opposite to the rotating shaft 16 is located above the rear wall 11a.

  In this modification, the seal rib 20 is disposed on the windward side with respect to the heater core 15, and therefore the passage restricting portion 25 is formed further on the windward side of the seal rib 20.

  (2) In the first to fourth embodiments, the guide means for guiding the air flow toward the central opening 20 a of the seal rib 20 by the passage restricting portion 25 formed in the windward air passage 18 of the heater core 15 is configured. However, instead of the passage restricting portion 25, a guide shape portion of the air flow may be formed in the upwind air passage 18 of the heater core 15.

  Here, the guide-shaped portion is partly formed on the case wall surface of the windward side air passage 18 and guides the air flow toward the central opening 20a. It does not limit the passage area itself.

  Thus, the guide means of the present invention is not limited to the one that narrows the passage width (passage area) itself like the passage restricting portion 25, but may be constituted by a guide-shaped portion.

  (3) In the first embodiment, as shown in FIG. 2 (a), the face blowing is illustrated and described, so that the center face blowing temperature and the side face blowing temperature are equalized (total blowing temperature). However, for example, the foot opening is disposed in the central region of the central opening 20a of the seal rib 20, and the left and right side face openings 232 are disposed in both the left and right regions of the central opening 20a. In this case, the foot blowing temperature may be adjusted to be higher than the side face blowing temperature by a predetermined value by adjusting the throttle amount of the passage throttle unit 25. That is, the temperature difference between the upper and lower outlets may be adjusted by adjusting the throttle amount of the passage throttle unit 25.

  (5) In the above embodiment, the application example to the heater core 15 that uses hot water as the heat source fluid has been described. However, for example, the heater core 15 that heats air using oil such as engine oil or hydraulic machine hydraulic oil as the heat source fluid is used. The invention may be applied.

It is a schematic longitudinal cross-sectional view of the indoor air-conditioning unit which shows 1st Embodiment of this invention. (A) is schematic explanatory drawing of the flow form of the cold air and the warm air at the intermediate rotation position of the rotary heating heat exchanger shown in FIG. 1, (b) is a cross-sectional view along AA in (a), (c) is (A) BB sectional drawing, (d) is a schematic explanatory drawing of the temperature distribution in CC sectional position of (b). (A) is a plane sectional view of the heat exchanger part for rotary heating shown in Drawing 1, (b) is a side sectional view of the heat exchanger part for rotary heating. (A) is a plane sectional view of the heat exchanger part for rotary heating by a 2nd embodiment, and (b) is a side sectional view of the heat exchanger part for rotary heating. (A) is a plane sectional view of the heat exchanger part for rotary heating by a comparative example, (b) is a side sectional view of the heat exchanger part for rotary heating by a comparative example. It is a schematic longitudinal cross-sectional view of the indoor air conditioning unit which shows 3rd Embodiment. It is a schematic longitudinal cross-sectional view of the indoor air conditioning unit which shows 4th Embodiment. (A) is schematic explanatory drawing of the flow form of the cold air and the hot air at the intermediate rotation position of the rotary heating heat exchanger of the indoor air conditioning unit examined by the inventor, (b) is an AA of (a). Sectional drawing, (c) is a BB sectional view of (a), and (d) is a schematic explanatory view of a temperature distribution at a CC sectional position of (b). (A) is a schematic longitudinal cross-sectional view of the indoor air-conditioning unit which the present inventor has examined as a prototype, (b) is a view in the direction of arrow D in (a), and (c) is a partial perspective view in the direction of arrow D.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Air-conditioning case, 15 ... Rotary heater core (heat exchanger for heating), 16 ... Rotating shaft,
20 ... seal rib (case side seal surface), 20a ... opening, 25 ... passage restrictor (guide means).

Claims (9)

A heating heat exchanger (15) for heating the air by exchanging heat between the air and the heat source fluid is disposed in the air conditioning case (11) so as to be rotatable about the rotation shaft (16),
When the heating heat exchanger (15) rotates to the maximum heating position, a sealing surface (20) that contacts the peripheral edge of the heating heat exchanger (15) is formed inside the air conditioning case (11). ,
An opening (20a) through which air can pass is formed at the center of the sealing surface (20),
Guide means (25) are arranged in the air conditioning case (11) on the windward side of the heat exchanger for heating (15) and on the left and right sides in the axial direction of the rotating shaft (16),
The air conditioner characterized in that the guide means (25) is configured to guide air toward the opening (20a) so that the air flows while avoiding the sealing surface (20). The guide means is formed at least in a portion close to the seal surface (20) in the windward air passage (18) located on the windward side of the rotation operation region of the heat exchanger (15) for heating. The air conditioner according to claim 1. The air conditioner according to claim 1 or 2, wherein the guide means includes a passage restricting portion (25) that restricts an area on the windward side of the heat exchanger (15) for heating. The air conditioner according to claim 3, wherein the passage restricting portion (25) is formed so as to increase the amount of passage restriction in a tapered shape from the upstream side to the downstream side of the air flow. The air conditioner according to claim 3, wherein the passage restriction portion (25) has a constant passage restriction amount from the upstream side to the downstream side of the air flow. The said guide means (25) is comprised by the guide-shaped part which orient | assigns the airflow of the windward side of the said heat exchanger for heating (15) to the said opening part (20a), The Claim 1 or 2 characterized by the above-mentioned. The air conditioner described. The end (15a) on the rotating shaft (16) side of the heating heat exchanger (15) is located on the leeward side, and is opposite to the rotating shaft (16) of the heating heat exchanger (15). The heating heat exchanger (15) is arranged in the air conditioning case (11) so that the side end (15b) is located on the windward side,
The air conditioner according to any one of claims 1 to 6, wherein the sealing surface (20) is arranged on the leeward side of the heating heat exchanger (15). The end (15a) on the rotating shaft (16) side of the heating heat exchanger (15) is located on the windward side, and is opposite to the rotating shaft (16) of the heating heat exchanger (15). The heating heat exchanger (15) is arranged in the air conditioning case (11) so that the side end (15b) is located on the leeward side,
The sealing surface (20) is disposed on the windward side of the heating heat exchanger (15), and the guide means (25) is disposed further on the windward side of the sealing surface (20). The air conditioner according to any one of claims 1 to 6. The said seal surface is comprised by the seal rib (20) which protrudes in the shape of a frame from the inner wall surface of the said air-conditioning case (11) so that the said opening part (20a) may be enclosed. The air conditioner as described in any one.

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