JP2018079718A - Vehicle air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently and stably blow air to a temperature sensor installation part while increasing the volume of a blast into a vehicle cabin in a vehicle air conditioner.SOLUTION: In an air-conditioning case 14 forming a vehicle air conditioner 10, an aspirator 24 is provided at a wall part 14a located at the vehicle rear side. The aspirator 24 has: a body 48 including an introduction part 54 and a lead-out part 56; and an air introduction part 50 which is connected with the body 48 and guides air in the air-conditioning case 14. The air introduction part 50 is formed into a cylindrical shape, and a resistance part 62 expanding inward is provided within the air introduction part 50. Ventilation resistance caused when air flows through the air introduction part 50 is increased to adjust an amount of air in the vehicle cabin taken into the temperature sensor S side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle air conditioner mounted on a vehicle, and more particularly to a vehicle air conditioner having an aspirator for guiding air in a vehicle compartment to a temperature sensor installation unit that detects the temperature in the vehicle compartment.

  2. Description of the Related Art Conventionally, a vehicle air conditioner mounted on a vehicle includes a temperature sensor that detects a temperature in the vehicle interior, and an aspirator is provided to guide air in the vehicle interior to an installation site of the temperature sensor. The aspirator is installed on a side wall along the width direction of the case body, and has a nozzle that sucks air in the vehicle interior as secondary air to the installation site of the temperature sensor, and an air flow path so as to surround the outer periphery of the nozzle. A main body to be formed and a primary air introduction section that takes in a part of the air flowing through the inside of the air conditioning case as primary air into the main body.

  Then, by introducing a part of the air flowing in the case body in the vehicle air conditioner to the primary air introduction part of the aspirator, the air in the vehicle interior is converted into secondary air through the nozzle to the installation site of the temperature sensor by the venturi effect. The air temperature in the passenger compartment is detected by suction.

JP 2014-141185 A

  In recent years, in the vehicle air conditioner as described above, the airflow resistance has been reduced for the purpose of further increasing the amount of air blown into the passenger compartment, and along with the reduction of the airflow resistance, There is a problem that the pressure drops and the aspirator cannot suck the air in the vehicle interior at a sufficient flow rate.

  Further, when air is introduced into the case body by driving the blower, the amount of air discharged from the aspirator increases when the amount of air blown from the blower is large and the vehicle interior is sucked into the aspirator accordingly. There is a problem that the flow rate of air increases and the temperature detection condition by the temperature sensor is not met.

  The present invention has been made in consideration of the above-described problems, and provides a vehicle air conditioner capable of sufficiently and stably blowing air to a temperature sensor installation portion while increasing the amount of air blown into a vehicle interior. The purpose is to do.

In order to achieve the above object, the present invention provides an air conditioning case having a flow path through which air flows and an air outlet, a blower that is provided inside the air conditioning case and blows air to the flow path, and an air conditioning case. In a vehicle air conditioner having an aspirator that is provided and takes air in the passenger compartment and supplies it to a temperature sensor installation unit,
The aspirator is provided with an air introduction part into which air flowing through the flow path is introduced, and the air introduction part is provided with a resistance part that bulges inward and reduces the cross-sectional area of the passage.

  According to the present invention, the air conditioning case constituting the vehicle air conditioner is provided with an aspirator that takes in the air in the passenger compartment and supplies it to the temperature sensor installation section, and this aspirator is introduced with the air flowing through the flow path. The air introduction part is provided with a resistance part that bulges inward and reduces the cross-sectional area of the passage.

  Therefore, for example, even when the pressure loss is reduced to reduce the airflow resistance in the air conditioning case and the internal pressure is low, the air in the vehicle interior (inside air) can be supplied at a sufficient flow rate by introducing the air in the air conditioning case into the aspirator. It can take in and blow to the temperature sensor installation part sufficiently. Furthermore, even when the air flow from the blower is increased and the air flow is increased, the air intake resistance is increased by the resistance portion to suppress the air intake amount from the air introduction portion, and the vehicle interior is taken into the temperature sensor installation portion. The air can be stably blown by preventing the air flow rate from increasing.

  According to the present invention, the following effects can be obtained.

  That is, an aspirator that takes in the air in the passenger compartment and supplies it to the temperature sensor installation part is provided in the air conditioning case that constitutes the vehicle air conditioner, and the air introduction part of the aspirator has an inflated passage cross-sectional area inward. Even if the internal pressure is low and the air pressure in the air conditioning case is low, the air in the air conditioning case is introduced into the aspirator to reduce the airflow resistance in the air conditioning case. The air flow can be taken in at a sufficient flow rate, and even when the air flow from the blower is increased, the air intake from the air introduction part is suppressed by the resistance part to take in the temperature sensor installation part. Therefore, it is possible to prevent the increase of the flow rate of the inside air and to stably blow air.

FIG. 1A is an overall cross-sectional view of a vehicle air conditioner according to an embodiment of the present invention, and FIG. 1B is an enlarged front view of an aspirator viewed from the air introduction side.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of a vehicle air conditioner according to the present invention will be described in detail below with reference to the accompanying drawings. 1A, reference numeral 10 indicates a vehicle air conditioner according to an embodiment of the present invention.

  As shown in FIG. 1A, the vehicle air conditioner 10 includes an air conditioning case 14 constituting each air passage (flow path) 12, a blower 16 disposed inside the air conditioning case 14, and the air An evaporator 18 that cools the air, a heater core 20 that heats the air, a damper mechanism 22 that switches the flow of air flowing through the passages 12, and an air conditioning case 14 that is provided in the air conditioning case 14 and sucks air in the vehicle interior. An aspirator 24. In addition, the side part of the air-conditioning case 14 is connected to an inside / outside air switching unit (not shown) for taking in outside air / inside air.

  The air-conditioning case 14 is composed of, for example, substantially symmetrical divided cases 26a and 26b, and a vent air outlet (air outlet) 28 for blowing air in the vicinity of the occupant's face and air in the vicinity of the front window of the vehicle. The defroster air outlet (air outlet) 30 for performing the opening is adjacently opened. In addition, a heat blowing port 32 that blows air to the vicinity of the feet of the passenger in the passenger compartment is opened in the wall portion 14a on the vehicle rear side (arrow A direction) in the air conditioning case 14. The heat blowing port 32 is formed so as to straddle the center of the air conditioning case 14 in the width direction, that is, the one divided case 26a and the other divided case 26b.

  Further, the aspirator 24 is attached to the wall portion 14 a on the vehicle rear side (arrow A direction) of the air conditioning case 14 through a mounting hole 34 at a position above the heat blower port 32.

  On the other hand, the air blower 16 is housed in the air conditioning case 14 at a position on the vehicle front side (arrow B direction) when the vehicle air conditioner 10 is mounted on the vehicle, and the evaporator 18 is housed below the blower 16. At the same time, the heater core 20 is housed at a position on the rear side of the vehicle (in the direction of arrow A) with respect to the evaporator 18.

  The blower 16 is, for example, a centrifugal fan having a rotary fan 36 having a plurality of fins and a drive motor 38 that rotationally drives the rotary fan 36.

  Then, when the drive motor 38 is driven to rotate based on a control signal from a controller (not shown), the rotary fan 36 rotates and air taken in from the inside / outside air switching unit (not shown) is introduced to the air conditioning case 14 side. And sent to the passage 12.

  In the evaporator 18, for example, a refrigerant is circulated through a plurality of tubes (not shown). When the air passes, heat exchange is performed with the refrigerant, and the cooled air is supplied to the downstream side of the evaporator 18.

  The heater core 20 is provided, for example, on the downstream side of the evaporator 18 in the air conditioning case 14, and warm water is circulated through a plurality of tubes (not shown). When the air passes, heat is exchanged with the warm water, and the heated air Is supplied to the downstream side of the heater core 20.

  The damper mechanism 22 is, for example, a first air mix damper 40 that is rotatably provided between the evaporator 18 and the heater core 20, and a first that is rotatably provided on the heater core 20 on the downstream side of the evaporator 18. It has the 2 air mix damper 42, the 1st switching damper 44 which switches the ventilation state of the vent ventilation port 28 and the defroster ventilation port 30, and the 2nd switching damper 46 which adjusts the ventilation state to the heat ventilation port 32.

  For example, the aspirator 24 is provided at the center in the width direction of the wall portion 14 a of the air conditioning case 14 and communicates with the passage 12 on the downstream side of the heater core 20. The aspirator 24 includes a body 48 and an air introduction part 50 that is connected to the body 48 and guides air in the air conditioning case 14. The aspirator 24 is fixed to the wall portion 14 a of the air conditioning case 14 through the mounting hole 34 at the end of the air introduction portion 50.

  The body 48 includes, for example, a main body 52, an introduction portion 54 that is connected to the main body portion 52 and introduces air (inside air) in the vehicle interior, and is opposite to the introduction portion 54 with respect to the main body portion 52. And a lead-out part 56 from which the air taken in the main body part 52 is led out, and the introduction part 54 and the lead-out part 56 are provided along the vertical direction of the air conditioning case 14.

  For example, a pipe 58 that connects the temperature sensor S installed in the passenger compartment is connected to the end of the introduction portion 54, and an instrument provided in front of the passenger compartment, for example, is connected to the upstream end thereof. A storage member (temperature sensor installation portion) 60 to be attached to the attachment panel is connected, and the temperature sensor S is stored in the storage member 60. That is, the aspirator 24 is connected to and communicates with the storage member 60 through the pipe 58.

  The lead-out portion 56 is joined to the other end portion of the main body portion 52, is formed in a cylindrical taper shape projecting in a direction away from the main body portion 52, and the air sucked into the main body portion 52 is moved outside the vehicle compartment. Discharged.

  As shown in FIGS. 1A and 1B, the air introduction portion 50 is, for example, cylindrical and formed with a predetermined length along the longitudinal direction, and the inside thereof is directed inward so as to be orthogonal to the extending direction. A bulging resistor portion 62 is provided. The resistance portion 62 bulges out from the inner peripheral surface of the air introduction portion 50 by a predetermined height to partially reduce the passage cross-sectional area. The air introduction part 50 is fixed in a state of being inserted into the mounting hole 34 so as to be substantially orthogonal to the wall part 14 a of the air conditioning case 14, and communicates with the passage 12 of the air conditioning case 14.

  The vehicle air conditioner 10 according to the embodiment of the present invention is basically configured as described above. Next, its operation and effects will be described.

  First, the case where the cooling operation for lowering the room temperature in the passenger compartment is performed will be described. When an occupant (not shown) operates the operation lever in the passenger compartment to select the cooling operation, an actuator (not shown) is driven according to the operation of the operation lever, and as shown in FIG. 1A, the first air mix damper 40 Rotates to be fully closed, and the second air mix damper 42 is fully opened.

  At the same time, the rotating fan 36 of the blower 16 rotates based on a control signal from a controller (not shown), so that the air sucked into the air conditioning case 14 flows downward along the passage 12 and then the evaporator. Heat is exchanged by passing through 18 and cooled to a predetermined temperature.

  The cooled air flows upward without flowing to the heater core 20 side, and then the vicinity of the occupant's face in the passenger compartment through the vent air vent 28 opened under the switching action of the first switching damper 44. It is blown into.

  Next, when performing a heating operation in which warm air is blown to the vicinity of the passenger's feet in the passenger compartment, the first air mix damper 40 is fully opened in accordance with the operation of an operation lever (not shown), and the second air mix damper 42 is opened. Turns to a fully closed state.

  Then, the air that has been blown from the blower 16 and cooled by passing through the evaporator 18 is heated to a predetermined temperature by passing through the heater core 20, and enters the vehicle interior from the heat blower opening 32 opened by the second switching damper 46. Supplied with.

  As described above, when the vehicle air conditioner 10 is cooled or heated, a part of the air supplied from the blower 16 to the air conditioning case 14 is on the downstream side of the heater core 20 and the air introduction unit 50 of the aspirator 24. As a result, the negative pressure is generated inside the main body 52 due to the venturi effect. Then, the air in the introduction portion 54 and the pipe 58 is sucked by the generation of the negative pressure, and accordingly, the air in the passenger compartment in which the storage member 60 is installed is sucked into the body 48 in the aspirator 24.

  Thereby, when the air in the vehicle interior is sucked from the storage member 60 into the aspirator 24 through the pipe 58, the temperature of the air passing through the temperature sensor S (vehicle interior temperature) is detected and output to a controller (not shown).

  In addition, when the amount of air sent to the passage 12 of the air conditioning case 14 increases as the voltage to the blower 16 increases, the air taken from the air conditioning case 14 into the air introduction unit 50 bulges inward. The resistance portion 62 that has become the ventilation resistance reduces the flow rate and circulates to the body 48 side. As a result, the amount of air in the air conditioning case 14 taken in from the air introduction part 50 of the aspirator 24 is discharged from the lead-out part 56, and accordingly, the air sent to the aspirator 24 through the storage member 60 is sent. The air volume decreases.

  In other words, the amount of air taken in the vehicle interior is suppressed by suppressing the amount of air introduced from the air conditioning case 14 to the aspirator 24 by the resistance portion 62.

  As described above, in the present embodiment, in the air conditioning case 14 constituting the vehicle air conditioner 10, the aspirator 24 is provided on the wall portion 14 a on the vehicle rear side (arrow A direction), and the air from the air conditioning case 14 is provided. A resistance portion 62 that bulges inward is provided in the air introduction portion 50 that takes in the air. Thereby, for example, even when the pressure is reduced to reduce the ventilation resistance in the air conditioning case 14 and the internal pressure is low, the air in the vehicle interior is introduced through the pipe 58 by introducing the air in the air conditioning case 14 into the aspirator 24. (Inside air) can be taken in at a sufficient flow rate, and sufficient air can be blown to the installation site of the temperature sensor S. Moreover, even when the amount of air blown from the blower 16 is increased, the resistance portion 62 allows the air introduction portion to flow. By suppressing the amount of air taken in from 50, it is possible to prevent an increase in the flow rate of the air in the passenger compartment that is taken into the temperature sensor S side and to blow air stably.

  Further, the shape of the resistance portion 62 is not limited to the case where the resistance portion 62 is formed in an annular shape along the inner peripheral surface of the air introduction portion 50 as described above. The amount of air taken in from the air introduction portion 50 is not limited. Any shape that can be suppressed may be used, and the amount of air taken into the aspirator 24 from the air conditioning case 14 can be freely adjusted by changing the shape of the resistance portion 62, and accordingly, the temperature sensor S side It is possible to adjust the amount of air blown into the passenger compartment that is taken into the vehicle.

  Furthermore, by providing the resistance part 62 in the air introduction part 50, it is possible to suppress the generation of abnormal noise when air passes when the air volume from the blower 16 is increased.

  Furthermore, by arranging the aspirator 24 in the center in the width direction so as to straddle the end portions of the split cases 26a and 26b, the air in the air conditioner case 14 has relatively stable airflow and temperature in the center in the width direction. It can be taken into the aspirator 24. Therefore, as compared with the vehicle air conditioner according to the prior art in which an aspirator is installed on the side wall of the case body along the width direction, it is possible to suppress variations in the temperature of the air taken into the aspirator 24 and the amount of air blown. It is possible to take in and use air with a stable air flow rate and temperature.

  In addition, the vehicle air conditioner according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Vehicle air conditioner 14 ... Air conditioning case 16 ... Air blower 24 ... Aspirator 48 ... Body 50 ... Air introduction part 54 ... Introduction part 56 ... Derivation part 58 ... Piping 60 ... Storage member 62 ... Resistance part S ... Temperature sensor

Claims (1)

An air-conditioning case having a flow path for air and an air outlet, a blower provided inside the air-conditioning case to blow the air to the flow path, a temperature provided by taking in air in the vehicle compartment provided in the air-conditioning case In a vehicle air conditioner having an aspirator for supplying to a sensor installation unit,
The aspirator includes an air introduction portion into which air flowing through the flow path is introduced, and the air introduction portion is provided with a resistance portion that bulges inward and reduces a cross-sectional area of the passage. Air conditioner.

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