JP2011121430A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an evaporator properly function, in an air conditioner enabling a two-layer flow mode. <P>SOLUTION: This air conditioner includes a first air blow passage 10 having an inside air inlet 11 for the first air blow passage and communicated with a foot outlet 13, a second air blow passage 20 having an outside air inlet 21 for the second air blow passage and communicated with a defroster outlet 22, a first air blower 30 arranged in the first air blow passage 10, a second air blower 33 arranged in the second air blow passage 20, a heater 32 for heating each air blow of the first air blow passage 10 and the second air blow passage 20, the evaporator 31 arranged in the first air blow passage 10 to cool the air blow, a first communicating port 5 for communicating the first air blow passage 10 with the second air blow passage 20 between a downstream side of the evaporator 31 and an upstream side of the heater 32, a first communicating port opening/closing door 6 opening/closing the first communicating port 5, a second communicating port 7 for communicating the first air blow passage 10 with the second air blow passage 20 at a downstream position of the heater 32, and a second communicating port opening/closing door 8 opening/closing the second communicating port 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner having two air passages.

  A conventional vehicle air conditioner of this type is disclosed in Patent Document 1. The vehicle air conditioner 100 includes an air conditioning case 101 as shown in FIG. A first air passage 110 and a second air passage 120 are provided in the air conditioning case 101 by a partition wall 102. The first air passage 110 has a first air passage inlet (not shown) and a first air passage inner air inlet (not shown), and is in communication with the foot outlet 111. The opening ratio of the outside air inlet for the first air passage (not shown) and the inside air inlet for the first air passage (not shown) can be varied by a first inside / outside air switching door (not shown). The second air passage 120 has a second air passage outside air inlet (not shown) and a second air passage inner air inlet (not shown), and is communicated with the vent outlet 121 and the defroster outlet 122. ing. The opening ratio of the outside air intake for the second air passage (not shown) and the inside air inlet for the second air passage (not shown) can be varied by a second inside / outside air switching door (not shown). The vent outlet 121 is opened and closed by a vent opening / closing door 139. The defroster outlet 122 is opened and closed by a defroster opening / closing door 140.

  In the first air passage 110 and the second air passage 120, the blower 131, the evaporator 132, and the heater core 133 are arranged in this order from the upstream side. The blower 131 includes a first fan part 131a, a second fan part 131b, and a motor part 131c. The first fan part 131a is disposed in the first air passage 110, and the second fan part 131b is disposed in the second air passage 120. Has been.

  The evaporator 132 is disposed across the first air passage 110 and the second air passage 120. A freeze prevention sensor 134 is provided immediately downstream of the evaporator 132 on the first air passage 110 side. The refrigeration cycle is controlled by the temperature detected by the antifreezing sensor 134 so that the temperature of the air passing through the evaporator 132 does not fall below 3 ° C., for example.

  The heater core 133 is disposed across the first air passage 110 and the second air passage 120. The first air passage 110 and the second air passage 120 are each provided with a bypass passage (not shown) that bypasses the heater core 133. The first air passage 110 and the second air passage 120 are respectively provided with a first mix door 135 and a second mix door 136 that can vary the ratio of the air passing through the heater core 133 and the air passing through the bypass passage. Yes.

  A communication port 137 that connects the first air passage 110 and the second air passage 120 is provided at the position of the partition wall 102 downstream of the heater core 133. The communication port 137 is opened and closed by a communication port opening / closing door 138. At the open position of the communication opening / closing door 138, the foot outlet 111 is also closed.

  In the above configuration, when the outside air temperature is extremely low (for example, 20 ° C. below freezing point) and the maximum heating mode prevents window fogging, the inside / outside air switching door (not shown) for the first air passage is on the inside air introduction side, The inside / outside air switching door (not shown) for the second air passage is switched to the outside air introduction side, and the first mix door 135 and the second mix door 136 are each positioned to pass all the air flow through the heater core 133, and the vent is opened and closed. The door 139 is located at the closed position, and the defroster opening / closing door 140 is located at the open position. Further, the communication opening / closing door 138 is set to the closed position, and the foot outlet 111 is opened. The first air passage 110 and the second air passage 120 are completely partitioned, and a two-layer flow mode in which the inside air and the outside air are blown into independent flow paths is obtained.

  Thereby, outside air with low humidity is introduced into the second air passage 120, and the introduced outside air with low humidity passes through the evaporator 132 and is heated by the heater core 133, and then blown out from the defroster outlet 122. Inside air is introduced into the first air passage 110, and the introduced inside air passes through the evaporator 132 and is heated by the heater core 133, and then blown out from the foot outlet 111. From the 1st ventilation path 110, warm air is produced under the condition where a heating load is low by internal air circulation. As described above, the vehicle interior can be quickly heated while preventing fogging of the windows.

  Further, in a normal mode other than the two-layer flow mode, the air conditioning air produced by the first air passage 110 and the air conditioning produced by the second air passage 120 are set by opening the communication opening / closing door 138. The wind can be mixed through the communication port 137.

JP-A-10-86638

  However, in the conventional vehicle air conditioner 100, a single evaporator 132 is disposed across the first air passage 110 and the second air passage 120. Accordingly, the evaporator 132 may be supplied with the inside air (or outside air) from the first air passage 110 side and the outside air (or inside air) from the second air passage 120 side, including during the two-layer flow mode. In other words, there is a case where air at different temperatures flows into the single evaporator 132.

  For example, when high-temperature air flows into the first air passage 110 and low-temperature air flows into the second air passage 120, the evaporator is configured to cool the high-temperature air in the first air passage 110 to the temperature just before freezing of the condensed water. Since 132 acts, the problem that the ventilation by the side of the 2nd ventilation path 120 is cooled to below the 1st ventilation temperature, and condensed water freezes occurs. On the other hand, when the low-temperature air flows into the first air passage 110 and the high-temperature air flows into the second air passage 120, the low-temperature air in the first air passage 110 is cooled to a temperature just before freezing of the condensed water. Thus, since the evaporator 132 acts, the problem that the high temperature ventilation by the side of the 2nd ventilation path 120 is not cooled enough generate | occur | produces. From the above, the evaporator 132 does not function properly.

  Accordingly, the present invention has been made to solve the above-described problems, and in an air conditioner capable of a two-layer flow mode in which the inside air and the outside air are blown into independent flow paths, a cooling heat exchanger is provided. An object of the present invention is to provide a vehicle air conditioner that can function properly.

  The invention according to claim 1 has a first air passage for the first air passage that takes in air in the vehicle interior, communicates with the foot air outlet, and an air intake for the second air passage that takes in air outside the vehicle compartment. A second air passage that has an inlet and communicates with the defroster air outlet; a first air blower that blows air to the first air passage; a second air blower that blows air to the second air passage; A first heating unit that heats the air from the first air passage, a second heating unit that heats the air from the second air passage, and one of the first air passage and the second air passage, A cooling heat exchanger that cools the air flow at an upstream position of the first heating section or the second heating section, a downstream position of the cooling heat exchanger, and an upstream position of the first heating section and the second heating section Between the first air passage and the second air passage, and the first air passage is opened. It is a vehicle air conditioning apparatus characterized by comprising a first communication path opening and closing means.

  Invention of Claim 2 is the air conditioning apparatus for vehicles of Claim 1, Comprising: The said heat exchanger for cooling is arrange | positioned in the said 1st ventilation path, and the said 1st ventilation path is said 1st. A first air passage having a first air passage intake for the first air passage in addition to the air intake for the air passage, and an opening ratio between the air inlet for the first air passage and the air intake for the first air passage can be varied. An inside / outside air switching means is provided.

  A third aspect of the present invention is the vehicle air conditioner according to the second aspect, wherein the first air passage inlet and the second air passage inlet are a single shared outside air inlet. The first air passage internal / external air switching means is configured to maintain the open state of the second air passage external air intake and the first air passage internal air intake. The opening ratio of the outside air inlet for the first air passage is variable.

  A fourth aspect of the present invention is the vehicle air conditioner according to the second or third aspect, wherein the first communication path opening / closing means opens the second air flow path at an open position of the first communication path. It is characterized by blocking.

  A fifth aspect of the present invention is the vehicle air conditioner according to the first aspect, wherein the cooling heat exchanger is disposed in the second air passage, and the second air passage is the second air passage. A second air passage having a second air passage inlet in addition to the air passage inlet for the air passage, and the opening ratio of the air passage for the second air passage and the air inlet for the second air passage can be varied. An inside / outside air switching means is provided.

  A sixth aspect of the present invention is the vehicle air conditioner according to the fifth aspect, wherein the first communication path opening / closing means blocks the first air passage when the first communication path is open. Features.

  A seventh aspect of the present invention is the vehicle air conditioner according to any one of the first to sixth aspects, wherein the first heating part and the second heating part are the first air passage and the first air passage. It is characterized by being comprised by the single heater arrange | positioned ranging over 2 ventilation paths.

  Invention of Claim 8 is an air conditioning apparatus for vehicles in any one of Claim 1-7, Comprising: The said 1st ventilation path in the downstream position of a said 1st heating part and a said 2nd heating part And a second communication passage communicating with the second air passage, and a second communication passage opening / closing means capable of opening and closing the second communication passage.

  According to the first aspect of the present invention, the first communication passage opening / closing door is set to the closed position and the first air passage and the second air passage are separately independent at the time of heating at a low outside air temperature and preventing fogging of the window. (Two-layer flow mode). Since the outside air with low humidity is introduced into the second air passage by the blowing force of the second air blowing means, and the introduced outside air with low humidity is heated by the second heating unit, it is blown out from the defroster outlet, so that the window Clouding is prevented. Inside air is introduced into the first air passage by the air blowing force of the first air blowing means, and the introduced inside air passes through the cooling heat exchanger and is heated by the first heating unit, and then blown out from the foot outlet. In the 1st ventilation path, since warm air can be produced in the condition where the heating load by internal air circulation is low, the vehicle interior can be heated quickly. As described above, the vehicle interior can be quickly heated while preventing fogging of the windows.

  Since the cooling heat exchanger is disposed only in one of the first air passage and the second air passage, the cooling heat exchanger has a substantially uniform temperature distribution (internal air) in any air conditioning mode. Or only the outside air) is supplied, and when the cooling heat exchanger performs a cooling operation, the cooling heat exchanger functions properly.

  In addition, since the first communication port opening / closing door is set to the open position, air can be supplied to both the first heating unit and the second heating unit, so that the first heating unit and the second heating unit are effectively used. it can.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, not only the inside air but also the outside air can be introduced into the first air passage, and the desired introduction air of the inside and outside air is supplied to the cooling heat exchanger and the first air. Since air-conditioning air can be produced by passing through the heating unit, various air-conditioning modes can be realized centering on the first air passage.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, since the outside air can be taken into the first air passage and the second air passage from a single shared outside air intake, the exposure to the outside air is possible. There is only one entrance, which simplifies the configuration. Moreover, the introduction of the outside air into the second air passage can be realized regardless of the switching between the introduction of the inside air and the introduction of the outside air in the first air passage.

  According to the invention of claim 4, in addition to the effects of the inventions of claims 1 to 3, when the first communication path opening / closing means is switched to the open position of the first communication path, the first communication path opening / closing means Since the introduction of air into the second air passage due to the ram pressure can be reliably prevented, there is no need to separately provide a means for shutting off the second air passage, and the configuration is simplified.

  According to the invention of claim 5, in addition to the effect of the invention of claim 1, not only the outside air but also the inside air can be introduced into the second air passage, and the desired introduction air of the inside and outside air is supplied to the cooling heat exchanger and the second air. Since air-conditioning air can be produced by passing through the heating unit, various air-conditioning modes can be realized centering on the second air passage.

  According to the invention of claim 6, in addition to the effect of the invention of claim 5, when the first communication path opening / closing means is switched to the open position of the first communication path, the first communication path opening / closing means uses the ram pressure. Since the introduction of air into the first air passage can be reliably prevented, there is no need to separately provide a means for shutting off the first air passage, and the configuration is simplified.

  According to the invention of claim 7, in addition to the effects of the inventions of claims 1 to 6, the configurations of the first heating unit and the second heating unit can be simplified, and the cost can be reduced.

  According to the eighth aspect of the present invention, in addition to the effects of the first to seventh aspects, the second communication passage opening / closing means is set to the open position, so that the conditioned air produced on the first air passage side and the second Mix the conditioned air produced on the air duct side, guide the conditioned air produced on the first air duct side to the defroster outlet side, guide the conditioned air produced on the second air duct side to the foot outlet side, etc. it can.

1 is a schematic cross-sectional view of a vehicle air conditioner according to a first embodiment of the present invention. The air conditioner for vehicles according to the first embodiment of the present invention, in which both the first communication opening / closing door and the second communication opening / closing door are in the closed position (two-layer flow mode) during heating while preventing window fogging FIG. 1 is a schematic cross-sectional view of a vehicle air conditioner according to a first embodiment of the present invention in which both a first communication opening / closing door and a second communication opening / closing door are in an open position in a normal mode that is not a two-layer flow mode. FIG. 2 shows a second embodiment of the present invention and is a schematic sectional view of a vehicle air conditioner. FIG. The air conditioning for vehicles which shows a 2nd embodiment of the present invention, and the 1st communicating port opening-and-closing door and the 2nd communicating port opening-and-closing door were both in the closed position (two-layer flow mode) at the time of the heating mode which prevented window fogging It is a schematic sectional drawing of an apparatus. The schematic cross section of the air conditioning apparatus for vehicles which shows 2nd Embodiment of this invention, and was the 1st communicating port opening-and-closing door and the 2nd communicating port opening-and-closing door being both opened in the normal mode which is not a two-layer flow mode FIG. It is a schematic block diagram of the vehicle air conditioner of a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 to 3 show a first embodiment of the present invention. FIG. 1 is a schematic cross-sectional view of a vehicle air conditioner 1A. FIG. FIG. 3 is a schematic cross-sectional view of the vehicle air conditioner 1A in which both the second communication opening / closing doors 8 are in the closed position (two-layer flow mode), and FIG. 3 shows the first communication port in a normal mode other than the two-layer flow mode. It is a schematic sectional drawing of 1A of vehicle air conditioners by which both the opening-and-closing door 6 and the 2nd communicating port opening-and-closing door 8 were made into the open position.

  In FIG. 1, the vehicle air conditioner 1 </ b> A has an air conditioning case 2. In the air conditioning case 2, a first air passage 10 and a second air passage 20 are provided by a partition wall 3.

  The first air passage 10 has a first air passage inlet 11 for the first air passage and an outside air inlet 12 for the first air passage, and is in communication with the foot outlet 13. A shared outside air inlet 4 is provided upstream of the first air passage outside air inlet 12, and the first air passage outside air inlet 12 passes the outside air (outside air) outside the vehicle compartment via the common outside air inlet 4. 1 Intake into the air passage 10. The inside air inlet 11 for the first air passage takes air in the vehicle compartment (inside air) into the first air passage 10. The first air passage inlet air 11 and the first air passage outer air inlet 12 are opened and closed by a first air passage inside / outside air switching door 14 serving as a first air passage inside / outside air switching means. The first air passage inside / outside air switching door 14 moves between the outside air introduction position indicated by the solid line in FIG. 1 and the inside air introduction position indicated by the phantom line in FIG. The opening ratio of the outside air inlet 12 for the air passage can be varied. At the outside air introduction position shown by the solid line in FIG. 1, only the outside air is introduced by fully opening the first air passage outside air inlet 12 and fully closing the first air passage inlet 11. At the inside air introduction position indicated by the phantom line in FIG. 1, only the inside air is introduced by fully opening the inside air inlet 11 for the first air passage and the outside air inlet 12 for the first air passage. At an intermediate position between the outside air introduction position and the inside air introduction position, outside air and inside air corresponding to the opening ratio are introduced. The first air passage internal / external air switching door 14 maintains the opening state of the second air passage external air inlet 21 described below and the first air passage internal air inlet 11 and the first air passage external air inlet. The opening ratio of 12 is variable.

  The foot outlet 13 is configured to blow out air toward the feet of the passengers in the passenger compartment. The foot outlet 13 can be opened and closed by a foot opening / closing door (not shown).

  The second air passage 20 has a second air passage inlet for the outside air 21 and communicates with the defroster air outlet 22. A shared outside air inlet 4 is provided upstream of the second air passage outside air inlet 21, and the second air passage outside air inlet 21 passes the outside air (outside air) outside the vehicle compartment via the shared outside air inlet 4. 2 Take in the air passage 20. That is, the second air passage outside air inlet 21 and the first air passage outside air inlet 12 are configured to be branched downstream of the shared outside air inlet 4.

  The defroster outlet 22 is configured to blow out air along the inner surface of a windshield (not shown). The defroster outlet 22 can be opened and closed by a defroster opening / closing door (not shown).

  A part of the first blower 30 that is the first blower means, the evaporator 31 that is the cooling heat exchanger, and the heater 32 that is the first heating unit is disposed in the first air passage 10 from upstream. The first blower 30 introduces air into the first air passage 10 from the first air passage inlet 11 and the first air passage outside air inlet 12, and blows the introduced air downstream.

  The evaporator 31 constitutes a vapor compression refrigeration cycle (not shown) together with a compressor, a condenser, and expansion means. The evaporator 31 cools the blown air by the refrigerant passing through the inside absorbing heat from the blown air. A freeze prevention sensor (not shown) is provided immediately downstream of the evaporator 31. The vapor compression refrigeration cycle is controlled by the detected temperature of the antifreezing sensor so that the temperature of the air passing through the evaporator 31 is cooled only to the temperature just before freezing of condensed water (for example, 3 ° C. to 4 ° C.). The heater 32 heats the air from the first air passage 10. The detailed configuration of the heater 32 will be described below.

  A part of the second blower 20 that is the second blower means and the heater 32 that is the second heating unit is disposed in the second blower passage 20 from upstream. The second blower 33 introduces the outside air from the outside air inlet 21 for the second air passage to the second air passage 20 and blows the introduced outside air downstream. The heater 32 heats the air blown from the second air passage 20. In this embodiment, the 1st heating part and the 2nd heating part are comprised by the single heater 32 arrange | positioned ranging over the 1st ventilation path 10 and the 2nd ventilation path 20. As shown in FIG.

  At the position of the partition wall 3 between the evaporator 31 and the heater 32, a first communication port 5 that is a first communication path that communicates the first air passage 10 and the second air passage 20 is provided. The first communication port 5 is opened and closed by a first communication port opening / closing door 6 which is a first communication path opening / closing means. The first communication opening / closing door 6 is moved between an open position indicated by a solid line in FIG. 1 and a closed position indicated by an imaginary line in FIG. In the open position indicated by the solid line in FIG. 1, the first communication port 5 is opened, and in the closed position indicated by the phantom line in FIG. 1, the first communication port 5 is closed. Further, the first communication opening / closing door 6 also performs communication / blocking of the second air passage 20, and puts the second air passage 20 in a shut-off state at the open position indicated by a solid line in FIG. 1.

  At the position of the partition wall 3 downstream from the heater 32, a second communication port 7 that is a second communication path that communicates the first air passage 10 and the second air passage 20 is provided. The second communication port 7 is opened and closed by a second communication port opening / closing door 8 which is a second communication passage opening / closing means. The second communication opening / closing door 8 is moved between an open position indicated by a solid line in FIG. 1 and a closed position indicated by an imaginary line in FIG. In the open position indicated by the solid line in FIG. 1, the second communication port 7 is opened, and in the closed position indicated by the phantom line in FIG. 1, the second communication port 7 is closed.

  The first air passage 10 and the second air passage 20 are each provided with a bypass passage (not shown) that bypasses the heater 32, and the air passing through the heater 32 and the bypass passage (not shown). ), A first mix door (not shown) and a second mix door (not shown) that can vary the air distribution ratio with the air passing through are provided.

  Next, the operation of the vehicle air conditioner 1A will be described. When heating at a low outside air temperature (for example, −20 ° C.) and preventing window fogging, as shown in FIG. 2, the inside / outside air switching door 14 for the first air passage is set to the inside air introduction position, and the first communication port is opened and closed. Both the door 6 and the second communication opening / closing door 8 are in the closed position. Thereby, the 1st ventilation path 10 and the 2nd ventilation path 20 are made into a separate independent ventilation path (two-layer flow mode). In addition, the first mix door (not shown) and the second mix door (not shown) are located at positions where all the air flows through the heater 32, and a foot opening door (not shown) and a defroster opening door ( Both are located in the open position.

  After the outside air with low humidity is introduced into the second air passage 20 by the air blowing force of the second air blower 33, the introduced outside air with low humidity is heated by the heater 32 in the second air passage 20, and then the defroster outlet To 22. From the defroster outlet 22, air blown warmer than the outside air having low humidity is blown out along the windshield, so that window fogging can be prevented.

  Inside air is introduced into the first air passage 10 by the air blowing force of the first air blower 30, the introduced inside air passes through the evaporator 31 and is heated by the heater 32 in the first air passage 10, and then the foot outlet 13. Led to. In the 1st ventilation path 10, since a warm air can be produced in the condition where the heating load by internal air circulation is low, a vehicle interior can be rapidly heated with the warm air which blows off from the foot blower outlet 13. FIG. As described above, the vehicle interior can be quickly heated while preventing fogging of the windows.

  Moreover, various air-conditioning modes are realizable by making at least one of the 1st communicating port opening / closing door 6 and the 2nd communicating port opening / closing door 8 into an open position. As shown in FIG. 3, by setting the first communication opening / closing door 6 to the open position, the air that has passed through the evaporator 31 is guided not only to the first air passage 10 but also to the second air passage 20, and the heater 32. Therefore, the heater 32 can be used effectively. In addition, as shown in FIG. 3, by setting the second communication opening / closing door 8 to the open position, the conditioned air produced on the first air passage 10 side and the conditioned air produced on the second air passage 20 side are changed. Mixing, the conditioned air produced on the first air passage 10 side can be guided to the defroster outlet 22 side, or the conditioned air produced on the second air passage 20 side can be guided to the foot outlet 13 side.

  Since the evaporator 31 is disposed only in the first air passage 10, in all the air conditioning modes, the evaporator 31 is supplied with only air with a substantially uniform temperature distribution (inside air or outside air or mixed air of inside and outside air). First, when the evaporator 31 performs the cooling operation, all the air is reliably cooled to the temperature just before the condensed water is frozen, and the evaporator 31 functions properly. That is, the evaporator 31 exhibits the maximum cooling performance (dehumidification performance) while preventing the condensed water from freezing. Moreover, since the evaporator 31 is arrange | positioned only in the 1st ventilation path 10, compared with a prior art example, the ventilation resistance of the 2nd ventilation path 20 is reduced, and cost becomes low.

  The evaporator 31 is arrange | positioned at the 1st ventilation path 10, and the 1st ventilation path 10 has the internal air inlet 11 for 1st ventilation paths, and the external air intake 12 for 1st ventilation paths, and is for 1st ventilation paths. There is provided a first air passage inside / outside air switching door 14 that can vary the opening ratio between the inside air inlet 11 and the first air passage outside air inlet 12. Therefore, not only the inside air but also the outside air can be introduced into the first air passage 10, and the desired introduction air of the inside and outside air can be passed through the evaporator 31 and the heater 32 on the first air passage 10 side to produce the conditioned air. Various air conditioning modes can be realized centering on the first air passage 10 communicating with the foot outlet 13.

  The outside air inlet 12 for the first air passage and the outside air inlet 21 for the second air passage are configured by being branched on the downstream side of the single shared outside air inlet 4, and the inside / outside air switching door for the first air passage. 14 changes the opening ratio of the 1st ventilation path internal air inlet 11 and the 1st ventilation path external air inlet 12 hold | maintaining the open state of the 2nd ventilation path external air inlet 21. FIG. Therefore, since outside air can be taken in into the 1st ventilation path 10 and the 2nd ventilation path 20 from the single common outside air intake 4, the intake port exposed to outside air may be one, and a structure is simplified. Moreover, the introduction of the outside air to the second air passage 20 can be realized regardless of the switching between the introduction of the inside air and the introduction of the outside air in the first air passage 10.

  When the first communication port 5 is switched to the open position of the first communication port 5, the first communication port 5 is switched to the open position of the first communication port 5 because the second air passage 20 is blocked when the first communication port 5 is open. In addition, since the introduction of the air into the second air passage 20 can be reliably prevented by the first communication opening / closing door 6, it is not necessary to separately provide a blocking means for the second air passage 20, and the configuration is simplified. That is, when it is desired to prohibit the introduction of the air into the second air passage 20, the air may be introduced into the second air passage 20 by the ram pressure only by not driving the second air blower 33. The introduction of air can be prevented without providing a shielding means for the second air passage 20 separately.

  Since the air blowing means is composed of the first air blower 30 disposed in the first air passage 10 and the second air blower 33 disposed in the second air passage 20, the air flow rate of the first air passage 10 and the second air flow rate. The air flow rate of the air flow path 20 can be adjusted independently. The air blowing means includes a first fan unit disposed in the first air passage 10, a second fan unit disposed in the second air passage 20, and a drive unit that rotates the first fan unit and the second fan unit together. You may comprise with the single air blower provided.

  Since the 1st heating part and the 2nd heating part are comprised by the single heater 32 arrange | positioned ranging over the 1st ventilation path 10 and the 2nd ventilation path 20, the 1st heating part and the 2nd heating part The configuration can be simplified and the cost can be reduced. The first heating unit and the second heating unit may be configured by independent heaters.

  In addition, in this 1st Embodiment, although the 2nd ventilation path 20 has only the external air inlet 21 for 2nd ventilation paths as an air introduction port, in addition to the 2nd ventilation path outside air inlet 21, it is the 2nd ventilation path. It is also possible to provide the inside / outside air switching means for the second air passage that is configured to have the inside air intake for use and can change the opening ratio. If comprised in this way, external air can be introduce | transduced also into the 2nd ventilation path 20. FIG.

(Second Embodiment)
4 to 6 show a second embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of the vehicle air conditioner 1B. FIG. FIG. 6 is a schematic cross-sectional view of the vehicle air conditioner 1B in which both the second communication opening / closing doors 8 are closed (two-layer flow mode), and FIG. 6 shows the first communication port in a normal mode other than the two-layer flow mode. It is a schematic sectional drawing of the air conditioning apparatus for vehicles 1B in which both the opening-and-closing door 6 and the 2nd communicating port opening-and-closing door 8 were made into the open position.

  In FIG. 4, the vehicle air conditioner 1 </ b> B has an air conditioning case 2. In the air conditioning case 2, a first air passage 10 and a second air passage 20 are provided by a partition wall 3.

  The first air passage 10 has a first air passage inlet 11 for the air passage, and is in communication with the foot air outlet 13. The inside air inlet 11 for the first air passage takes air in the vehicle compartment (inside air) into the first air passage 10.

  The foot outlet 13 is configured to blow out air toward the feet of the passengers in the passenger compartment. The foot outlet 13 can be opened and closed by a foot opening / closing door (not shown).

  The second air passage 20 includes a second air passage inlet 21 and a second air passage inlet 23, and is in communication with the defroster outlet 22. The outside air inlet 21 for the second air passage takes air outside the passenger compartment (outside air) into the second air passage 20. The inside air inlet 23 for the second air passage takes air in the vehicle compartment (inside air) into the second air passage 20. The outside air inlet 21 for the second air passage and the inside air inlet 23 for the second air passage are opened and closed by a second air passage inside / outside air switching door 24 which is a second air inside / outside air switching means. The inside / outside air switching door 24 for the second air passage moves between the outside air introduction position indicated by the solid line in FIG. 4 and the inside air introduction position indicated by the phantom line in FIG. The opening ratio of the air passage inlet 23 for the air passage can be varied. At the outside air introduction position shown by the solid line in FIG. 4, only the outside air is introduced by fully opening the outside air inlet 21 for the second air passage and fully closing the inside air inlet 23 for the second air passage. At the inside air introduction position indicated by the phantom line in FIG. 4, only the inside air is introduced by fully opening the inside air inlet 23 for the second air passage and fully closing the outside air inlet 21 for the second air passage. At an intermediate position between the outside air introduction position and the inside air introduction position, outside air and inside air corresponding to the opening ratio are introduced.

  The defroster outlet 22 is configured to blow out air along the inner surface of a windshield (not shown). The defroster outlet 22 can be opened and closed by a defroster opening / closing door (not shown).

  In the 1st ventilation path 10, the 1st air blower 30 and a part of heater 32 which is a 1st heating part are arrange | positioned from upstream. The first blower 30 introduces the inside air from the inside air inlet 11 for the first air passage 11 to the first air passage 10 and blows the introduced inside air toward the downstream. The heater 32 heats the air from the first air passage 10. The detailed configuration of the heater 32 will be described below.

  From the upstream, the second blower passage 20 is provided with a second blower 33, an evaporator 31 that is a cooling heat exchanger, and a part of a heater 32 that is a second heating unit. The second blower 33 introduces air into the second blower passage 20 from the second blower passage outside air inlet 21 and the second blower passage inner air inlet 23 and blows the introduced air downstream.

  The evaporator 31 constitutes a vapor compression refrigeration cycle (not shown) together with a compressor, a condenser, and expansion means. And the evaporator 31 cools ventilation, when the refrigerant | coolant which passes through the inside absorbs heat from ventilation. A freeze prevention sensor (not shown) is provided immediately downstream of the evaporator 31. The vapor compression refrigeration cycle is controlled so that the temperature of the air passing through the evaporator 31 is cooled only to the temperature just before freezing of condensed water (for example, 3 ° C. to 4 ° C.) according to the temperature detected by the anti-freezing sensor. The heater 32 heats the air blown from the second air passage 20. That is, in this embodiment, the 1st heating part and the 2nd heating part are comprised by the single heater 32 arrange | positioned ranging over the 1st ventilation path 10 and the 2nd ventilation path 20. FIG.

  At the position of the partition wall 3 between the evaporator 31 and the heater 32, a first communication port 5 that is a first communication path that communicates the first air passage 10 and the second air passage 20 is provided. The first communication port 5 is opened and closed by a first communication port opening / closing door 6 which is a first communication path opening / closing means. The first communication opening / closing door 6 is moved between an open position indicated by a solid line in FIG. 4 and a closed position indicated by an imaginary line in FIG. In the open position indicated by a solid line in FIG. 4, the first communication port 5 is opened, and in the closed position indicated by a virtual line in FIG. 4, the first communication port 5 is closed. In addition, the first communication opening / closing door 6 also performs communication / blocking of the first air passage 10, and puts the first air passage 10 in a shut-off state at the open position indicated by a solid line in FIG.

  At the position of the partition wall 3 downstream from the heater 32, a second communication port 7 that is a second communication path that communicates the first air passage 10 and the second air passage 20 is provided. The second communication port 7 is opened and closed by a second communication port opening / closing door 8 which is a second communication passage opening / closing means. The second communication opening / closing door 8 is moved between an open position indicated by a solid line in FIG. 4 and a closed position indicated by an imaginary line in FIG. In the open position indicated by a solid line in FIG. 4, the second communication port 7 is opened, and in the closed position indicated by a virtual line in FIG. 4, the second communication port 7 is closed.

  The first air passage 10 and the second air passage 20 are each provided with a bypass passage (not shown) that bypasses the heater 32, and the air passing through the heater 32 and the bypass passage (not shown). ), A first mix door (not shown) and a second mix door (not shown) that can vary the air distribution ratio with the air passing through are provided.

  Next, the operation of the vehicle air conditioner 1B will be described. When heating is performed at a low outside air temperature (for example, −20 ° C.) and window fogging is prevented, as shown in FIG. Both the door 6 and the second communication opening / closing door 8 are set to the closing position. Thereby, the 1st ventilation path 10 and the 2nd ventilation path 20 are made into a separate independent ventilation path (two-layer flow mode). In addition, the first mix door (not shown) and the second mix door (not shown) are located at positions where all the air flows through the heater 32, and a foot opening door (not shown) and a defroster opening door ( Both are located in the open position.

  Outside air having low humidity is introduced into the second air passage 20 by the blowing force of the second blower 33, and the introduced outside air having low humidity passes through the evaporator 31 and is heated by the heater 32, and then is supplied to the defroster outlet 22. Led. From the defroster outlet 22, air blown warmer than the outside air having low humidity is blown out along the windshield, so that window fogging can be prevented.

  Inside air is introduced into the first air passage 10 by the air blowing force of the first air blower 30, the introduced inside air passes through the evaporator 31 and is heated by the heater 32 in the first air passage 10, and then the foot outlet 13. Led to. In the 1st ventilation path 10, since a warm air can be produced in the condition where the heating load by internal air circulation is low, a vehicle interior can be rapidly heated with the warm air which blows off from the foot blower outlet 13. FIG. As described above, the vehicle interior can be quickly heated while preventing fogging of the windows.

  Moreover, various air-conditioning modes are realizable by making at least one of the 1st communicating port opening / closing door 6 and the 2nd communicating port opening / closing door 8 into an open position. As shown in FIG. 6, by setting the first communication opening / closing door 6 to the open position, the air that has passed through the evaporator 31 is guided not only to the second air passage 20 but also to the first air passage 10, and the heater 32. Therefore, the heater 32 can be used effectively. In addition, as shown in FIG. 6, by setting the second communication opening / closing door 8 to the open position, the conditioned air produced on the first air passage 10 side and the conditioned air produced on the second air passage 20 side are changed. Mixing, the conditioned air produced on the first air passage 10 side can be guided to the defroster outlet 22 side, or the conditioned air produced on the second air passage 20 side can be guided to the foot outlet 13 side.

  Since the evaporator 31 is disposed only in the second air passage 20, in all air-conditioning modes, the evaporator 31 is supplied with only air with a substantially uniform temperature distribution (inside air or outside air or mixed air of inside and outside air). First, when the evaporator 31 performs the cooling operation, all the air is reliably cooled to the temperature just before the condensed water is frozen, and the evaporator 31 functions properly. That is, the evaporator 31 exhibits the maximum cooling performance (dehumidification performance) while preventing the condensed water from freezing. Moreover, since the evaporator 31 is arrange | positioned only in the 2nd ventilation path 20, compared with a prior art example, the ventilation resistance of the 1st ventilation path 10 is reduced, cost becomes low.

  The evaporator 31 is arrange | positioned at the 2nd ventilation path 20, and the 2nd ventilation path 20 has the external air inlet 21 for 2nd ventilation paths, and the internal air inlet 23 for 2nd ventilation paths, and is for 2nd ventilation paths. The inside / outside air switching door 24 for the 2nd ventilation path which can vary the opening ratio of the outside air intake 21 and the inside air intake 23 for the 2nd ventilation path is provided. Therefore, not only the outside air but also the inside air can be introduced into the second air passage 20, and the desired introduction air of the inside and outside air can be passed through the evaporator 31 and the heater 32 in the second air passage 20 to produce the conditioned air. Various air conditioning modes can be realized around the second air passage 20 communicating with the defroster outlet 22.

  The first communication opening / closing door 6 blocks the first air passage 10 at the open position of the first communication opening 5, so when the first communication opening / closing door 6 is switched to the open position of the first communication opening 5, Since the air introduction into the first air passage 10 due to the ram pressure can be blocked by the first communication opening / closing door 6, it is not necessary to separately provide a blocking means for the first air passage 10, and the configuration is simplified. That is, when it is desired to prohibit the introduction of the air into the first air passage 10, there is a possibility that the air is introduced into the first air passage 10 by the ram pressure without driving the first air blower 30. The introduction of air can be prevented without providing a shielding means for the first air passage 10 separately.

  Since the air blowing means is composed of the first air blower 30 disposed in the first air passage 10 and the second air blower 33 disposed in the second air passage 20, the air flow rate of the first air passage 10 and the second air flow rate. The air flow rate of the air flow path 20 can be adjusted independently. The air blowing means includes a first fan unit disposed in the first air passage 10, a second fan unit disposed in the second air passage 20, and a drive unit that rotates the first fan unit and the second fan unit together. You may comprise with the single air blower provided.

  Since the 1st heating part and the 2nd heating part are comprised by the single heater 32 arrange | positioned ranging over the 1st ventilation path 10 and the 2nd ventilation path 20, the 1st heating part and the 2nd heating part The configuration can be simplified and the cost can be reduced. Of course, the first heating unit and the second heating unit may be configured by independent heaters.

  In addition, in this 2nd Embodiment, although the 1st ventilation path 10 has only the 1st ventilation path internal air inlet 11 as an air introduction port, in addition to the 1st ventilation path internal air intake 11, it is the 1st ventilation path. It is also possible to provide first outside / inside air switching means for the air passage that is configured to have an outside air intake for use and that can vary the opening ratio. If comprised in this way, inside air can be introduced also into the 1st ventilation path 10. FIG.

(Other)
In the first embodiment and the second embodiment, the case where the foot outlet 13 and the defroster outlet 22 are provided as the outlet has been described. However, even when another outlet such as a vent outlet is provided. Of course, the invention is applicable.

  The heater 32 of the first embodiment and the second embodiment only needs to be capable of heating the passing air. For example, it may be a heater core that circulates hot water heated by a PTC element heater, which is an electric hot water heater, and heats the air by the circulating hot water. The engine cooling water is circulated and the air is blown by the circulating hot water. A heater core for heating may be used, or an electric heater (for example, a sheathed heater) may be used. The PTC element heater is a self-temperature control type heater using a PTC element (Positive Temperature Coefficient) heating element, and automatically performs temperature management by itself, so that no external control is required.

  In addition, the explanation is based on the application to a refrigeration cycle that is controlled so that the temperature of air passing through the evaporator does not become too low depending on the temperature detected by the anti-freezing sensor. Is also applicable. For example, a low pressure control valve that detects the evaporator outlet refrigerant pressure and limits the refrigerant flow rate to the target refrigerant pressure, a variable displacement compressor that varies the discharge capacity per revolution, an electric compressor that varies the number of revolutions, etc. Even if the vehicle air conditioner of the present invention is combined with the refrigeration cycle, the cooling heat exchanger functions properly in the two-layer flow mode air conditioner in which the inside air and the outside air are blown into independent flow paths. Needless to say, the effect of making it happen.

1A, 1B Vehicle air conditioner 4 Shared outside air intake 5 First communication port (first communication channel)
6 First communication opening / closing door (first communication passage opening / closing means)
7 Second communication port (first communication passage)
8 First communication opening / closing door (first communication passage opening / closing means)
DESCRIPTION OF SYMBOLS 10 1st ventilation path 11 Inside air inlet for 1st ventilation paths 12 Outside air inlet for 1st ventilation paths 13 Foot outlet 14 Inside / outside air switching means for 1st ventilation paths (inside / outside air switching door for 1st ventilation path)
DESCRIPTION OF SYMBOLS 20 2nd ventilation path 21 Outside air inlet for 2nd ventilation paths 22 Defroster outlet 23 Inside air inlet for 2nd ventilation paths 24 Inside / outside air switching means for 2nd ventilation paths (inside / outside air switching door for 2nd ventilation paths)
30 1st blower (first blower means)
31 Evaporator (cooling heat exchanger)
32 Heater (first heating unit, second heating unit)
33 Second blower (second blower)

Claims (8)

A first air passage (10) having an internal air inlet (11) for a first air passage for taking in air in the vehicle interior and communicating with the foot air outlet (13);
A second air passage (20) having an outside air inlet (21) for a second air passage for taking in air outside the passenger compartment and communicating with the defroster air outlet (22);
First blowing means (30) for blowing air to the first blowing path (10);
Second blowing means (33) for blowing air to the second blowing path (20);
A first heating section (32) for heating the air blown from the first air passage (10);
A second heating section (32) for heating the air blown from the second air passage (20);
It arrange | positions in any one of a said 1st ventilation path (10) and a said 2nd ventilation path (20), and cools ventilation at the upstream position of the said 1st heating part (10) or the said 2nd heating part (20). A heat exchanger for cooling (31);
Between the downstream position of the cooling heat exchanger (31) and the upstream positions of the first heating section (32) and the second heating section (32), the first air passage (10) and the second air blowing A first communication path (5) communicating with the path (20);
A vehicle air conditioner (1A), (1B), comprising: a first communication path opening / closing means (6) capable of opening and closing the first communication path (5). The vehicle air conditioner (1A) according to claim 1,
The cooling heat exchanger (31) is disposed in the first air passage (10),
The first air passage (10) includes a first air passage inlet (12) in addition to the first air passage inner air inlet (11), and the first air passage inner air inlet (12). 11) and a first air passage internal / external air switching means (14) capable of varying the opening ratio of the first air passage outside air inlet (12) is provided. . The vehicle air conditioner (1A) according to claim 2,
The outside air inlet (12) for the first air passage and the outside air inlet (21) for the second air passage are configured by being branched downstream of the single common outside air inlet (4),
The inside / outside air switching means (14) for the first air passage is connected to the inside air inlet (11) for the first air passage (11) and the first air passage while maintaining the open state of the outside air inlet (21) for the second air passage. A vehicle air conditioner (1A) characterized in that the opening ratio of the outside air inlet (12) for the air passage is variable. The vehicle air conditioner (1A) according to claim 2 or claim 3,
The vehicle air conditioner (1A), wherein the first communication passage opening / closing means (6) blocks the second air passage (20) when the first communication passage (5) is open. The vehicle air conditioner (1B) according to claim 1,
The cooling heat exchanger (31) is disposed in the second air passage (20),
The second air passage (20) includes a second air passage inlet (23) in addition to the second air passage outside air inlet (21), and the second air passage outside air inlet (23). 21) and a second air passage internal / external air switching means (24) capable of varying the opening ratio of the second air passage inlet (23). The vehicle air conditioner (1B) . The vehicle air conditioner (1B) according to claim 5,
The vehicle air conditioner (1B), wherein the first communication passage opening / closing means (6) blocks the first air passage (10) when the first communication passage (5) is open. The vehicle air conditioner (1A), (1B) according to any one of claims 1 to 6,
The first heating section (32) and the second heating section (32) are a single heater (32) disposed across the first air passage (10) and the second air passage (20). A vehicle air conditioner (1A), (1B), characterized by comprising: The vehicle air conditioner (1A), (1B) according to any one of claims 1 to 7,
A second communication path (7) communicating the first air passage (10) and the second air passage (20) at a position downstream of the first heating section (32) and the second heating section (32); A vehicle air conditioner (1A), (1B), comprising: a second communication path opening / closing means (8) capable of opening and closing the second communication path (7).

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