JP2007223543A - Vehicular roof mounting type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular roof mounting type air conditioner capable of blowing out uniform air-conditioned air into a cabin by a simple constitution even if it is varied from high load (the maximum cooling ability) to low load (the minimum cooling ability). <P>SOLUTION: Between a right side blowing out duct 7A having a right side blowing port 8A, a left side blowing out duct 7B having a left side blowing out port 8B and an evaporator, intermediate duct parts 13A, 13B for communicating these are provided. According to this, difference of the left and right temperatures is not generated on the blowing out temperature and the uniform air-conditioned air can be blown out to front/rear sides and left and right sides in the cabin by the simple constitution even if it is varied from the high load (the maximum cooling ability) to the low load (the minimum cooling ability), thereby, air-conditioning feeling can be improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle roof-mounted air conditioner mounted on the roof of a vehicle such as a bus.

  2. Description of the Related Art Conventionally, in a vehicle roof-mounted air conditioner that is mounted on the roof of a vehicle such as a bus, two refrigeration cycles in which a compressor, a condenser, a decompression means, and an evaporator are connected in an annular shape, so-called two compressor (compressor) cycles There is a thing using. FIG. 11 is a schematic plan view showing an outline of the configuration of a vehicle roof-mounted air conditioner using the conventional two-compressor cycle.

  A suction port 9 is disposed in the middle of the air passage in an air conditioning unit 13 having a suction port 9 at one end and a right side outlet 8A and a left side outlet 8B into the passenger compartment at the other end and an air passage is formed inside. A right blower 19A that generates an air flow from 9 to the right outlet 8A, and a right evaporator 11A that is arranged in the middle of the air passage and cools air passing through the air passage. Yes.

  Similarly, the left blower 19B that is arranged in the middle of the air passage and generates an air flow from the suction port 9 toward the left outlet 8B, and the air passage that is also arranged in the middle of the air passage. And a left evaporator 11B for cooling the passing air. Incidentally, 6A in FIG. 11 is a compressor of the right refrigeration cycle, 6B is a compressor of the left refrigeration cycle, 7A is a right cold air duct, 7B is a left cold air duct, and 25 is an air volume adjusting door.

  As a typical air conditioning control in an air conditioner having such a configuration, the blower air volume is decreased as the vehicle interior air temperature approaches the set temperature, and the compressor is turned ON / OFF when the vehicle interior air temperature approaches the set temperature. Hold. When entering the compressor ON / OFF control as the heat retention control, the cooled air is blown out from one of the left and right cold air ducts (for example, the right side) and only the air is blown from the other (in this case, the left side). The cooling capacity at the time of low load is adjusted by alternately operating left and right at predetermined time intervals (for example, at intervals of 1 minute).

Patent Document 1 below discloses a bus vehicle air conditioner that uses a plurality of compressors, installs a plurality of cooling units in left and right ducts, and controls each cooling unit separately.
JP-A-6-87321

  However, the former prior art has a problem that the air conditioning feeling is poor because the cooling air and the air flow are alternately applied to an occupant directly under the air outlet. There is also a problem that a difference in temperature between the left and right sides occurs in the bus cabin.

  The latter prior art requires a space for installing a plurality of cooling units in the passenger compartment, and the refrigeration cycle is complicated in terms of configuration and control. Further, when the evaporator on one side is stopped during a low heat load, there is a problem that cooling air is not emitted from the blowout duct on the connected side.

  The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a vehicle with a simple configuration even when the load is changed from a high load (maximum cooling capacity) to a low load (minimum cooling capacity). An object of the present invention is to provide a roof-mounted air conditioner for a vehicle that can blow a uniform conditioned air into the room.

In order to achieve the above object, the present invention employs technical means described in claims 1 to 3. That is, the invention according to claim 1 is a vehicle roof-mounted air conditioner mounted on a vehicle roof (10),
In the air conditioning unit (13) having an inlet (9) at one end and a right and left outlet (8A, 8B) to the passenger compartment at the other end and forming an air passage inside,
A blowing means (19) disposed in the middle of the air passage to generate an air flow from the suction port (9) toward the right side and the left side outlet (8A, 8B);
In a vehicle roof-mounted air conditioner provided with a cooling heat exchanger (11) for cooling air passing through the air passage disposed in the middle of the air passage,
An intermediate duct portion that communicates between a right outlet duct (7A) having a right outlet (8A), a left outlet duct (7B) having a left outlet (8B), and a cooling heat exchanger (11). (13A, 13B) is provided.

  According to the first aspect of the present invention, there is no difference between the left and right temperatures in the blowing temperature, and even with a simple configuration, even if the load is changed from a high load (maximum cooling capacity) to a low load (minimum cooling capacity). Uniform conditioned air can be blown out in the front, rear, left and right of the passenger compartment, and the air conditioning feeling can be improved.

  Moreover, in invention of Claim 2, in the vehicle roof mounting | wearing type | formula air conditioning apparatus of Claim 1, to the front-back direction of a vehicle in each of a right side blowing duct (7A) and a left side blowing duct (7B). It is characterized in that front and rear air volume varying means (25A, 25B, 26A, 26B) for varying the air volume distribution are provided. According to the second aspect of the present invention, not only the overall air conditioning in the passenger compartment but also the cold wind distribution corresponding to the heat load generated in the front, rear, left and right of the passenger compartment is possible, and the zone control in the front, rear, left and right of the passenger compartment is possible. Is possible.

  According to a third aspect of the present invention, in the vehicle roof-mounted air conditioner according to the first or second aspect, the right outlet duct (7A) side and the left side are disposed in the intermediate duct portion (13A, 13B). It is characterized in that left and right communication variable means (27A, 27B) for varying the amount of communication with the blowing duct (7B) side is provided.

  According to the third aspect of the present invention, when the difference is set between the right and left blowing air volume, the right and left separation characteristics are eliminated by eliminating the communication between the right blowing duct (7A) side and the left blowing duct (7B) side. Can be improved. In addition, when the amount of blown air is reduced on one side, the cooling capacity of the air conditioner can be turned to the other side without waste by connecting the right side blowing duct (7A) side and the left side blowing duct (7B) side. Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with the specific means described in the embodiments described later.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. First, an outline of the configuration will be described with reference to FIGS. FIG. 1 is a perspective view of a bus vehicle showing a configuration outline of a vehicle roof-mounted air conditioner 1 according to the present invention in a mounted state, and FIG. 2 is a configuration outline of the vehicle roof-mounted air conditioner 1 of FIG. FIG. 3 is a schematic plan view showing an outline of the configuration of the vehicle roof-mounted air conditioner 1 shown in FIGS. 1 and 2, and FIG. 4 is a schematic configuration diagram of the refrigeration cycle.

  First, reference numeral 2 in FIG. 1 denotes a heating unit, a heater core 3 that uses cooling water of a traveling engine (not shown) as a heat source, and a hot air duct 4 that forms a flow path of air heated by the heater core 3. It is arranged on the floor of a bus vehicle. The hot air duct 4 is disposed on each of the left and right sides of the vehicle and extends in the front-rear direction of the vehicle, and the heater core 3 is disposed on each of the front and rear end portions of the hot air duct 4. Further, a plurality of hot air outlets 5 are formed in the hot air duct 4, from which hot air is blown out toward the passenger's feet in the passenger compartment.

  Next, as shown in FIG. 3 and FIG. 4, a condenser (condenser) 15, an outside air fan 14, an evaporator (corresponding to the heat exchanger for cooling referred to in the present invention) 11, and a blower (blower means referred to in the present invention) This is a known cooling unit (corresponding to the vehicle roof-mounted air conditioner referred to in the present invention) including 19 and the like, and is mounted on the roof 10 of the bus vehicle.

  The refrigeration cycle constituting the cooling unit 1 is a well-known one used in a vehicle air conditioner. As shown in FIG. 4, a compressor (compressor) 6, a condenser 15, a receiver 16, an expansion valve (pressure reducing means). 18, each refrigeration equipment such as the evaporator 11 is annularly connected by a refrigerant pipe.

  The compressor 6 is disposed below the rear floor of the bus vehicle (see FIG. 1), and is driven from a traveling engine (not shown) via an electromagnetic clutch. The condenser 15 cools and condenses the high-temperature and high-pressure refrigerant compressed by the compressor 6 with the outside air sent by the outside air fan 14.

  The receiver 16 is disposed on the refrigerant outflow side of the condenser 15, performs gas-liquid separation of the refrigerant outflowed from the condenser 15, and flows out only the liquid phase refrigerant toward the expansion valve 18, and becomes surplus in the receiver 16. By storing liquid refrigerant, the amount of refrigerant circulating in the refrigeration cycle is adjusted.

  In FIG. 4, a super cooler (supercooling heat exchanger) 17 is configured between the receiver 16 and the expansion valve 18, but a refrigeration cycle that does not include the super cooler 17 may be used. An expansion valve 18 serving as a refrigerant decompression unit is disposed on the liquid phase refrigerant outflow side of the super cooler 17.

  The expansion valve 18 is a temperature type, and its valve opening is adjusted in accordance with the refrigerant temperature on the refrigerant outflow side of the evaporator 11. Specifically, a temperature sensing cylinder (not shown) that senses the refrigerant temperature is disposed on the refrigerant outflow side of the evaporator 11, and when the refrigerant temperature (cooling load) is high, the valve opening is increased, and the refrigerant temperature (cooling load) is increased. When the valve is low, the valve opening is reduced.

  An evaporator 11 is disposed on the refrigerant outflow side of the expansion valve 18 to evaporate the low-temperature and low-pressure liquid-phase refrigerant to cool the air-conditioning air. The evaporator 11 is ventilated by the blower 19. Cool air for air conditioning. As shown in FIG. 2, the cooling unit 1 has a condensing unit portion 12 and a cooling unit portion (corresponding to an air conditioning unit referred to in the present invention) 13 integrally formed.

  The condensing unit section 12 includes a capacitor 15 and an outside air fan 14 that blows outside air to the capacitor 15. Further, the cooling unit 13 includes an evaporator 11 and a blower 19 for passing air (inside air) in the vehicle interior or air outside the vehicle (outside air) through the evaporator 11 in an air conditioning case (not shown). Yes. In the present embodiment, the evaporator 11 and the blower 19 are configured in two sets.

  Incidentally, reference numeral 9 in FIG. 3 denotes an inside air suction port (corresponding to the suction port referred to in the present invention). However, the suction port also has an outside air suction port (not shown), on the upstream side of the air flow of the evaporator 11. Inside air and outside air are switched and introduced by inside / outside air switching means (not shown). The air ventilated by the blower 19 to the evaporator 11 is cooled by heat exchange with the low-temperature refrigerant when passing through the evaporator 11, and the right-side cold air duct (corresponding to the right-side outlet duct in the present invention) 7A and the left-side cold air It is supplied to a duct (corresponding to the left outlet duct referred to in the present invention) 7B (see FIGS. 1 and 3).

  The cold air ducts 7A and 7B are arranged on the left and right sides of the vehicle and extend in the front-rear direction of the vehicle. In addition, a plurality of air outlets 8A and 8B are formed in the cold air ducts 7A and 7B, from which cold air is blown out toward the passenger's head in the passenger compartment. In addition, 21 shown in FIG.3, FIG.4 is an inside temperature sensor which detects the temperature of vehicle interior air, and the detected inside temperature is input into the air-conditioning control apparatus 20 shown in FIG.

  In addition, for example, an operation signal from an air-conditioning operation panel (not shown) in which an occupant such as a driver sets the operating / stopping of the air-conditioning device and sets the set temperature, the blowing mode, and the like is input to the air-conditioning control device 20. The refrigeration equipment such as the heating unit 2, the compressor 6, the outside air fan 14 and the blower 19 of the cooling unit 1, and the variable doors 25 to 27 described later are controlled by the air conditioning control device 20. .

  Next, the configuration and structure of the main part according to the present invention will be described with reference to FIGS. 5 shows the blowing state in the all cabin mode, FIG. 6 shows the blowing state in the driver seat priority mode, FIG. 7 shows the blowing state in the left and right one-side priority mode, and FIG. 8 shows the blowing state in the front and rear one-side priority mode. It is a plane schematic diagram. First, as shown in FIG. 3, right and left intermediate duct portions (corresponding to the intermediate duct portion referred to in the present invention) 13A and 13B communicating between the right outlet duct 7A, the left outlet duct 7B, and the evaporator 11 are connected. Is provided.

  As shown in FIG. 5, the right front variable door 25A, the right rear variable door 25B, and the left front variable door that change the air volume distribution in the longitudinal direction of the vehicle in each of the right outlet duct 7A and the left outlet duct 7B. 26A, the left rear variable door 26B (corresponding to these front and rear air volume variable means in the present invention) and the communication amount between the right outlet duct 7A side and the left outlet duct 7B side in the previous intermediate duct portions 13A, 13B. Variable left and right communication variable doors (corresponding to the left and right communication variable means in the present invention) 27A and 27B are provided. The opening degree of these variable doors 25 to 27 is controlled by the air conditioning control device 20 via an actuator (not shown).

  Next, the outline | summary of the action | operation in the air conditioning apparatus of the structure mentioned above is demonstrated. First, when the vehicle interior temperature detected by the inside air temperature sensor 21 is higher than the set temperature input from the air conditioning operation panel, the operation mode of the cooling capacity corresponding to the temperature difference is automatically selected and the operation is performed. Is called. The blowout mode can be selected from the air conditioning operation panel as described below.

All guest room mode When uniformly air-conditioning the passenger compartment of the bus, as shown in FIG. 5, the conditioned air passing through the evaporator 11 is sent to the left and right outlet ducts 7A and 7B via the intermediate duct portions 13A and 13B. At this time, the variable doors 25 and 26 in the front-rear direction are all fully opened, and the left and right communication variable door 27 is fully closed. Thereby, air-conditioning wind can be blown uniformly into the passenger compartment.

Driver's seat priority mode Air conditioning in the passenger cabin is not required when the bus is forwarded, etc. When only the driver's seat is to be air-conditioned, as shown in FIG. 6, only the right front variable door 25A in the driver's seat direction is fully opened, and the other front and rear The variable doors 25B, 26A, and 26B in the direction are all fully closed. The left and right communication variable door 27 is fully open. As a result, the conditioned air can be blown out only in the vicinity of the driver's seat.

Left and right one-side priority mode When the inside of the passenger compartment of the bus requires conditioned air only on the right side of the vehicle, for example, due to the influence of polarized sunlight, the right variable doors 25A and 25B on the right side of the vehicle are fully opened as shown in FIG. The opening degree of the variable doors 26A and 26B is reduced (indicated as fully closed in FIG. 7). The left and right communication variable door 27 is fully open. Thereby, the air conditioned wind can be blown out with priority on the vehicle right side (or left side).

Front / rear one-side priority mode Similar to the left / right one-side priority mode described above, when the passenger compartment of the bus requires air conditioning air only on the front side of the vehicle, for example, as shown in FIG. The variable doors 25A and 26A are fully opened, and the opening of the rear variable doors 25B and 26B is narrowed (shown as fully closed in FIG. 8). The left and right communication variable door 27 is fully closed. Accordingly, the conditioned air can be blown out with priority given to the front side (or rear side) of the vehicle.

  Next, features and effects of this embodiment will be described. First, intermediate duct portions 13A and 13B are provided between the right air outlet duct 7A having the right air outlet 8A, the left air outlet duct 7B having the left air outlet 8B, and the evaporator 11 to communicate these. According to this, there is no difference in the left and right temperature in the blowout temperature, and it is uniform in the front, rear, left and right of the passenger compartment even when changing from a high load (maximum cooling capacity) to a low load (minimum cooling capacity) with a simple configuration. Air conditioned air can be blown out, and the air conditioning feeling can be improved.

  In addition, front and rear air volume variable doors 25A, 25B, 26A, and 26B that vary the air volume distribution in the front-rear direction of the vehicle are provided in each of the right outlet duct 7A and the left outlet duct 7B. According to this, not only the overall air conditioning in the passenger compartment but also the cold air distribution corresponding to the height of the heat load generated in the front, rear, left and right in the passenger compartment is possible, and zone control in the front, rear, left and right in the passenger compartment is possible.

  In addition, left and right communication variable doors 27A and 27B are provided in the intermediate duct portions 13A and 13B. The left and right communication variable doors 27A and 27B change the amount of communication between the right outlet duct 7A and the left outlet duct 7B. According to this, when the difference is set between the right and left blowing air volume, the right and left separation can be improved by eliminating the communication between the right blowing duct 7A side and the left blowing duct 7B side. In addition, when the amount of blown air is reduced on one side, the cooling capacity of the air conditioner can be turned to the other side without waste by communicating the right blowing duct 7A side and the left blowing duct 7B side.

(Other embodiments)
Although the above-described embodiment is applied to a bus vehicle, the present invention is not limited to this, and may be applied to a vehicle such as a train or a roof-mounted air conditioner for a ship. Further, in the above-described embodiment, even if there are two evaporators 11, the refrigeration cycle is one. However, each of the two evaporators 11 is operated as appropriate as a two-compressor cycle that is an independent refrigeration cycle. It is good to do.

  In the above-described embodiment, the left / right one-side priority mode and the front / rear one-side priority mode are selected on the air conditioning operation panel. However, the air conditioning control device 20 automatically performs the auto mode according to the representative temperature information and solar radiation information on the front, rear, left and right of the vehicle. You may make it vary the amount of cold winds to the front and rear, right and left of a vehicle.

  Moreover, you may enable it to control to a different ventilation volume by the blower 19 which becomes the right side middle duct part 13A side, and the blower 19 which becomes the left side middle duct part 13B side in the state of the above-mentioned all guest room mode or the front-rear one side priority mode. . On the contrary, in the configuration in which there is no difference in the air flow rate on the left and right sides, the left and right communication variable doors 27A and 27B may be omitted.

  FIG. 9 is a schematic plan view showing an example in which the evaporator 11 is arranged separately in the left-right direction of the vehicle as another embodiment. In the above-described embodiment, the evaporator 11 is arranged separately in the front-rear direction of the vehicle. However, the evaporator 11 may be arranged separately in the left-right direction of the vehicle.

  FIG. 10 is a schematic diagram showing another embodiment of the variable doors 25 to 27, in which (a) shows a double-sided door and (b) shows a blind door. In the above-described embodiment, each of the variable doors 25 to 27 is a single-side or central-axis plate door. However, other door means may be used as described above, including a shutter type (not shown).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a bus vehicle showing a schematic configuration in a mounted state of a vehicle roof-mounted air conditioner 1 according to the present invention. It is a perspective view which shows the structure outline | summary of the roof-mounted air conditioner 1 for vehicles of FIG. FIG. 3 is a schematic plan view showing a configuration outline of the vehicle roof-mounted air conditioner 1 of FIGS. 1 and 2. It is a block diagram of a structure of a refrigerating cycle. It is a plane schematic diagram which shows the ventilation state at the time of all the guest room modes. It is a plane schematic diagram which shows the ventilation state at the time of driver's seat priority mode. It is a plane schematic diagram which shows the ventilation state at the time of right-and-left one side priority mode. It is a plane schematic diagram which shows the ventilation state at the time of front and back one side priority mode. It is a plane schematic diagram showing the example which divided and arrange | positioned the evaporator 11 to the left-right direction of a vehicle as other embodiment. It is a schematic diagram which shows other embodiment of the variable doors 25-27, (a) shows a both-sides open / close type door, (b) shows a blind type door. It is a plane schematic diagram which shows the structure outline | summary of the vehicle roof mounted | worn installation type air conditioner using the conventional 2 compressor cycle.

Explanation of symbols

7A ... right side cold air duct (right side outlet duct)
7B ... Left side cool air duct (left outlet duct)
8A ... Right outlet 8B ... Left outlet 9 ... Inside air inlet (suction inlet)
10 ... Roof 11 ... Evaporator (cooling heat exchanger)
13 ... Cooling unit (air conditioning unit)
13A: Right intermediate duct part (intermediate duct part)
13B ... Left intermediate duct part (intermediate duct part)
19 ... Blower (Blower)
25A: Right front variable door (front / rear air volume variable means)
25B ... Right rear variable door (front and rear air volume variable means)
26A: Left front variable door (front / rear air volume variable means)
26B ... Left rear variable door (front and rear air volume variable means)
27A, 27B ... Left / Right communication variable door (Left / Right communication variable means)

Claims (3)

A vehicle roof-mounted air conditioner mounted on a vehicle roof (10);
In the air conditioning unit (13) having an inlet (9) at one end and a right and left outlet (8A, 8B) to the passenger compartment at the other end and forming an air passage inside,
A blowing means (19) disposed in the middle of the air passage to generate an air flow from the suction port (9) toward the right and left outlets (8A, 8B);
In the vehicle roof-mounted air conditioner provided with a cooling heat exchanger (11) that is disposed in the middle of the air passage and cools the air passing through the air passage,
These are communicated between the right outlet duct (7A) having the right outlet (8A), the left outlet duct (7B) having the left outlet (8B), and the cooling heat exchanger (11). A roof-mounted air conditioner for a vehicle characterized by providing intermediate duct portions (13A, 13B).   Front / rear air volume variable means (25A, 25B, 26A, 26B) for varying the air volume distribution in the front-rear direction of the vehicle is provided in each of the right outlet duct (7A) and the left outlet duct (7B). The roof-mounted air conditioner for a vehicle according to claim 1.   Left and right communication variable means (27A, 27B) for varying the amount of communication between the right outlet duct (7A) and the left outlet duct (7B) is provided in the intermediate duct (13A, 13B). The vehicle-mounted roof-mounted air conditioner according to claim 1 or 2.

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