JP2005280433A - Aspirator and aspirator for vehicle air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aspirator for a vehicle air conditioner realizing the enhancement of suction efficiency of air in an aspirator with high suction, pressure reduction and air extraction performance and air in a vehicle and the enhancement of responsibility of the vehicle air conditioner. <P>SOLUTION: The aspirator 1 has a cylindrical passage part 4 provided so as to surround a distal end of a nozzle 8 for delivering secondary air; a primary air flow passage 3 communicated with an outer periphery of the cylindrical passage part 4; and a diffuser 5 communicated with a distal end opening part of the cylindrical passage part 4. The axis of the primary air flow passage 3 is made eccentric to the axis of the cylindrical passage 4 to make a primary air flow in the cylindrical passage part 4 to a rotation flow. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an aspirator and an aspirator for vehicle air conditioning.

An aspirator is widely known as a decompression deaeration device, and is used, for example, when a vehicle air conditioner sucks vehicle interior air. The vehicle air conditioner aspirator of the first conventional example will be described with reference to FIG. The primary air introduced from the primary air flow path 3 provided in the primary air duct 2 of the vehicle air conditioner enters the throat portion 5b of the diffuser 5 through the curved passage portion 4 and is depressurized by the diffuser 5 to be in the vehicle interior. However, since the direction of flow can be changed by approximately 90 degrees in the curved passage portion 4, the maximum wind speed portion 11a flows about 2.5 mm above the tube center 4b 'on the outlet side 4a. On the other hand, the aspirator 21 is provided with primary air by arranging the central axis 8a of the nozzle 8 and the central axis 5a of the diffuser 5 on the maximum wind speed part 11a of the wind speed distribution 11 in the throat part 5b of the diffuser 5. By utilizing the suction force to the maximum, the secondary air amount is increased by about 1.2 times, and the inside air sensor accurately detects the temperature in the passenger compartment. (For example, see Patent Document 1)
Next, Conventional Example 2 will be described with reference to FIGS.
In the aspirator 31, the primary air flow path 3, the cylindrical passage portion 4, and the nozzle 8 are integrally formed of synthetic resin, and a diffuser 5 formed of synthetic resin is bonded thereto. Further, the central axis 8a of the nozzle 8, the central axis 4a of the cylindrical passage 4 and the central axis 5a of the diffuser 5 are arranged on the same line, and the central line 3a of the air flow path 3 is as shown in FIG. It is disposed at a position where it intersects with the central axis 8a and the central axis 4b. In the aspirator 31 configured as described above, the primary air introduced from the primary air flow path 3 changes direction by approximately 90 degrees in the cylindrical passage portion 4, enters the throat portion 5 b of the diffuser 5, and is depressurized by the diffuser 5. The vehicle interior air (secondary air) is sucked from the tip 8b of the nozzle 8 through the air pipe 7 through the air pipe 7 due to the venturi effect in the throat 5b. The room temperature is detected.

JP-A-5-155227

  However, since the increase ratio of the secondary air in the aspirator 21 of the conventional example 1 is not as high as about 1.2 times, it is considered that the inside air sensor may not be able to accurately detect the temperature in the passenger compartment. In addition, as a result of the actual vehicle test, the aspirator 31 of the conventional example 2 is evaluated as having poor responsiveness to the temperature control of the auto air conditioner because it cannot detect the temperature in the passenger compartment accurately due to low suction force, and there is a demand for improvement. It was.

  In view of the above, an object of the present invention is to provide an aspirator with high suction, decompression and bleed performance and an aspirator for vehicle air conditioning that can improve the efficiency of suction of air in the passenger compartment, and thus improve the responsiveness of the vehicle air conditioner.

  The present invention employs the following means (1) to (5) in order to solve the above problems.

  (1) An aspirator according to a first means includes a cylindrical passage portion provided so as to surround a tip portion of a nozzle that discharges secondary air, and a primary air passage that communicates with an outer periphery of the cylindrical passage portion. An aspirator having a diffuser communicating with the open end portion of the cylindrical passage portion is disposed so that a center line of the primary air flow path is eccentric with respect to a central axis of the cylindrical passage portion. The primary air flow in the cylindrical passage portion is a swirling flow. Since the swirling flow of the primary air flow is discharged from the open end portion of the cylindrical passage portion, the secondary air discharged from the nozzle tip to the diffuser is increased, and the suction efficiency of the secondary air is increased.

  (2) A vehicle air conditioning aspirator according to a second means includes a nozzle connected to an air pipe communicating with an indoor air sensor for detecting room temperature of a vehicle, and a cylindrical passage provided so as to surround the tip of the nozzle. And a primary air flow path connected to the primary air duct of the vehicle air conditioner and communicating with the cylindrical passage portion, and a diffuser communicating with the open end portion of the cylindrical passage portion In the aspirator for use, the primary air flow path is arranged so that a center line of the primary air flow path is eccentric with respect to a central axis of the cylindrical passage part, and the primary air flow in the cylindrical passage part is swirled. It is characterized by a flow. Since the swirling flow of the primary air flow is discharged from the open end portion of the cylindrical passage portion, the vehicle interior air discharged to the diffuser from the nozzle front end is increased, and the suction efficiency of the vehicle interior air is increased.

  (3) A vehicle air conditioning aspirator according to a third means is a cylinder connected to a nozzle connected to an air pipe communicating with an indoor air sensor for detecting room temperature of a vehicle, and a cylinder provided so as to surround the outer periphery of the tip of the nozzle. A vehicle having a passage portion, a primary air flow path connected to a primary air duct of a vehicle air conditioner, communicating with the cylindrical passage portion, and a diffuser communicating with a tip opening portion of the cylindrical passage portion In the air-conditioning aspirator, when the dimension value of the inner radius of the cylindrical passage portion is R and the dimension value from the center line of the primary air flow path to the inside of the primary air flow path is A, the primary air flow path The center line is arranged such that it is at a position that is eccentric to the R-A dimension value from the central axis of the cylindrical passage portion. Since the primary air is introduced from the primary air flow path into the cylindrical passage from an eccentric position, the primary air flow reaching the cylindrical passage becomes a swirling flow and is discharged to the diffuser as a swirling flow. The vehicle interior air discharged from the nozzle tip to the diffuser is increased, and the suction efficiency of the vehicle interior air is increased.

  (4) A vehicle air conditioning aspirator according to a fourth means includes a nozzle connected to an air pipe communicating with an indoor air sensor for detecting room temperature of a vehicle, and a cylinder provided so as to surround the outer periphery of the tip of the nozzle. A vehicle having a passage portion, a primary air flow path connected to a primary air duct of a vehicle air conditioner, communicating with the cylindrical passage portion, and a diffuser communicating with a tip opening portion of the cylindrical passage portion The air-conditioning aspirator is characterized in that a rib is provided in the vicinity of a boundary between the primary air flow path and the cylindrical passage portion. The primary air flow from the primary air flow path is introduced into the cylindrical passage part from the position that is obstructed by the ribs, and becomes a swirling flow in the cylindrical passage part and is discharged to the diffuser. The vehicle interior air is increased in speed, and the suction efficiency of the vehicle interior air is increased.

  (5) A vehicle air conditioning aspirator according to a fifth means includes a nozzle connected to an air pipe communicating with an indoor air sensor for detecting room temperature of a vehicle, and a cylinder provided so as to surround the outer periphery of the tip of the nozzle. A vehicle having a passage portion, a primary air flow path connected to a primary air duct of a vehicle air conditioner, communicating with the cylindrical passage portion, and a diffuser communicating with a tip opening portion of the cylindrical passage portion In the air conditioning aspirator, a part of the primary air flow path is an inclined wall. The primary air flow from the primary air flow path flows along the inclined wall, is introduced into the cylindrical passage portion from the eccentric position, becomes a swirling flow in the cylindrical passage portion, and is discharged to the diffuser. The cabin air discharged to the diffuser is increased in speed, and the suction efficiency of the cabin air is increased.

  The aspirator according to claim 1, comprising first means, a cylindrical passage portion provided so as to surround a tip portion of a nozzle for discharging secondary air, and primary air communicating with an outer periphery of the cylindrical passage portion. In an aspirator having a flow path and a diffuser communicating with the open end portion of the cylindrical passage portion, a center line of the primary air flow path is positioned to be eccentric with respect to a central axis of the cylindrical passage portion. The primary air flow in the cylindrical passage is a swirl flow, and the primary air flow is accelerated by the swirl flow and discharged to the diffuser, and the secondary air discharged from the nozzle Increases suction efficiency.

  The vehicular air conditioning aspirator according to claim 2, comprising a second means, is provided so as to surround a nozzle connected to an air pipe communicating with an indoor air sensor for detecting a room temperature of the vehicle, and a tip of the nozzle. A cylindrical passage portion connected to a primary air duct of a vehicle air conditioner, a primary air flow path communicating with the cylindrical passage portion, and a diffuser communicating with a tip opening portion of the cylindrical passage portion. In the vehicular air conditioning aspirator, the primary air flow path is disposed so that a center line of the primary air flow path is eccentric with respect to a central axis of the cylindrical passage part, and the primary air in the cylindrical passage part is provided. The primary air flow is accelerated by the swirl flow and discharged to the diffuser, the suction efficiency of the air in the vehicle discharged from the nozzle is increased, and the temperature control responsiveness of the vehicle air conditioner is improved. Improvement Are, therefore, it is possible to improve the cooling and heating capability of the vehicle air conditioner.

  The vehicle air-conditioning aspirator according to claim 3, comprising third means, is provided so as to surround a nozzle connected to an air pipe communicating with an indoor air sensor for detecting a room temperature of the vehicle, and an outer periphery of a tip portion of the nozzle. A cylindrical passage portion that is connected to a primary air duct of the vehicle air conditioner, communicates with the cylindrical passage portion, and communicates with the open end portion of the cylindrical passage portion. When the dimension value of the inner radius of the cylindrical passage part is R and the dimension value from the center line of the primary air flow path to the inner side of the primary air flow path is A, The center line of the air flow path is arranged such that the center line of the cylindrical passage part is at an RA dimension value and an eccentric position from the central axis of the cylindrical passage part, and the primary air flow in the cylindrical passage part with eccentricity. Becomes a swirl flow. The following air flow is discharged into the diffuser to increase speed. Therefore, the suction efficiency of the air in the vehicle discharged from the nozzle is increased, the responsiveness of the temperature control of the vehicle air conditioner can be improved, and consequently the air conditioning capability of the vehicle air conditioner can be improved.

  The vehicle air-conditioning aspirator according to claim 4 comprising the fourth means is provided so as to surround a nozzle connected to an air pipe communicating with an inside air sensor for detecting a room temperature of the vehicle and an outer periphery of a tip portion of the nozzle. A cylindrical passage portion that is connected to a primary air duct of the vehicle air conditioner, communicates with the cylindrical passage portion, and communicates with the open end portion of the cylindrical passage portion. A rib for projecting a rib near the boundary between the primary air flow path and the cylindrical passage portion, and the primary air flow is biased and introduced to one side of the cylindrical passage portion by the rib, It becomes a swirl flow and the primary air flow is accelerated and discharged to the diffuser. Therefore, the suction efficiency of the air in the vehicle discharged from the nozzle is increased, the responsiveness of the temperature control of the vehicle air conditioner can be improved, and consequently the air conditioning capability of the vehicle air conditioner can be improved.

  The vehicular air conditioning aspirator according to claim 5 comprising a fifth means is provided so as to surround a nozzle connected to an air pipe communicating with an indoor air sensor for detecting a room temperature of the vehicle and an outer periphery of a tip portion of the nozzle. A cylindrical passage portion that is connected to a primary air duct of the vehicle air conditioner, communicates with the cylindrical passage portion, and communicates with the open end portion of the cylindrical passage portion. A part of the primary air flow path is an inclined wall, and the primary air flow is biased and introduced into one of the cylindrical passage portions by the inclined wall to become a swirling flow. The next air flow is accelerated and discharged to the diffuser. Therefore, the suction efficiency of the air in the vehicle discharged from the nozzle is increased, the responsiveness of the temperature control of the vehicle air conditioner can be improved, and consequently the air conditioning capability of the vehicle air conditioner can be improved.

  The best mode for carrying out the present invention will be described based on the first, second, and third embodiments shown in FIGS.

  FIG. 1 is a layout diagram illustrating the layout of an aspirator in a vehicle air conditioner, FIG. 2 is a cross-sectional view of the aspirator, FIG. 3 is a cross-sectional view taken along the line BB in FIG. 5 is a cross-sectional view for explaining the airflow in FIG. 3, and FIG. 6 is a characteristic comparison diagram of the aspirator.

  As shown in FIG. 1, an aspirator 1 used in a vehicle air conditioner is for detecting a room temperature provided in a primary air flow path 3 provided in a primary air duct 2 and an instrument panel 13 of the vehicle. The air pipe 7 communicated with the indoor air sensor 6 is connected and used, and the air in the vehicle interior (2 Aspirate next air). In the figure, 9 is a blower, 10 is an evaporator, and 12 is a heater, which are provided in the primary air duct 2. D indicates an open / close damper. The vehicle air conditioner includes a blower such as the blower 9 and a blow duct described above, and uses the blowing force to generate a swirl flow to increase the suction efficiency of the aspirator 1.

  As shown in FIGS. 2 and 3, the aspirator 1 includes a primary air flow path 3, a cylindrical passage 4 and a nozzle 8 which are integrally formed of synthetic resin, and a diffuser 5 formed of synthetic resin is bonded thereto. ing. The proximal end of the nozzle 8 is connected to the air pipe 7 shown in FIG. 1, and the cylindrical passage portion 4 is provided so as to surround the outer periphery of the distal end portion of the nozzle 8. The primary air flow path 3 is connected to and connected to the primary air duct 2 of the vehicle air conditioner shown in FIG. A diffuser 5 is provided in communication with the open end of the cylindrical passage 4.

  Further, although the central axis 8a of the nozzle 8, the central axis 4b of the cylindrical passage 4 and the central axis 5a of the diffuser 5 are arranged on the same line, as shown in FIG. And R is the dimension value from the center line 3a of the primary air flow path 3 to the inside of the air flow path 3, the center line 3a of the primary air flow path 3 is from the central axis 4b and the central axis 8a. The RA dimension value is arranged at an eccentric position.

  As shown in FIGS. 4 and 5, in the aspirator 1, the primary air introduced from the primary air passage 3 enters the cylindrical passage portion 4, but the center line 3 a of the primary air passage 3 is the cylindrical passage portion. Since the center axis 4b 4 is arranged at an R-A dimension value and an eccentric position, it turns and flows, enters the throat 5b of the diffuser 5, is decompressed by the diffuser 5, and flows into the vehicle compartment. This swirling flow also generates a suction force due to the venturi effect in the throat portion 5 b and sucks secondary air from the tip 8 b of the nozzle 8, so that the room temperature disposed in the instrument panel 13 of the vehicle via the air pipe 7 is reached. The vehicle interior air (secondary air) is introduced from the sensing interior air sensor 6 so that the interior air sensor 6 accurately detects the temperature in the vehicle interior.

  Based on FIG. 6, characteristics of the aspirator 1 and the aspirator 31 of the conventional example 2 are compared. As shown in FIG. 6, when the primary air static pressure of the aspirator is a predetermined standard value, the secondary air amount of the first embodiment increases to about 1.5 times that of the conventional example 2, and the first embodiment 1 The amount of primary air decreased approximately 0.9 times that of Conventional Example 2. Assuming that the value obtained by dividing the amount of secondary air by the amount of primary air is the aspirator suction efficiency, the suction efficiency of Example 1 is about 1.7 times that of Conventional Example 2 and is improved very well.

  This is because the primary air flows in an oblique direction along the inner surface of the cylindrical passage portion 4, the throat portion 5 b of the diffuser 5, and the inner surface of the diffuser 5 due to centrifugal force while swirling, and thus does not swivel as in the conventional example 2. This is because the flow velocity of the primary air is increased as compared with the case where the throat portion 5b passes in a linear direction parallel to the central axis 5a.

  As a result of the above, the aspirator of the first embodiment increased the secondary air amount by about 1.5 times compared to the conventional example 2 under the same conditions. It was evaluated that the response to the temperature control of the auto air conditioner was improved. In addition, the aspirator of the first embodiment reduces the primary air amount by about 0.9 times compared to the conventional example 2, thereby increasing the amount of air sent to the evaporator 10 shown in FIG. As a result, the cooling capacity and heating capacity were slightly increased.

  FIG. 7 is a cross-sectional view taken along a direction perpendicular to the central axis 4 b of the cylindrical passage portion 4. The aspirator 1 shown in FIG. 7 is provided with a rib 14 on the right side of the boundary between the primary air passage 3 and the cylindrical passage portion 4. According to this configuration, as shown in FIG. 8, the air flow from the primary air flow path 3 is biased and introduced to one side of the cylindrical passage portion 4 by the ribs 14 to become a clockwise swirl flow, and the primary air flow is increased. It is quickly discharged into the diffuser. Therefore, the suction efficiency of the in-vehicle air discharged from the nozzle 8 is increased, the responsiveness of the temperature control of the vehicle air conditioner can be improved, and the air conditioning capability of the vehicle air conditioner can be improved.

  FIG. 9 is a cross-sectional view taken along a direction perpendicular to the central axis 4 b of the cylindrical passage portion 4. The aspirator 1 shown in FIG. 9 is provided with an inclined wall 3 b that is inclined in a direction narrowing toward the cylindrical passage portion 4 in a part of the primary air flow path 3. According to this configuration, as shown in FIG. 10, the primary air flow is biased and introduced to one side of the cylindrical passage portion 4 by the inclined wall 3 b, resulting in a clockwise swirl flow, and the primary air flow is increased to increase the diffuser. Discharged. Therefore, the suction efficiency of the in-vehicle air discharged from the nozzle 8 is increased, the responsiveness of the temperature control of the vehicle air conditioner can be improved, and the air conditioning capability of the vehicle air conditioner can be improved.

  In short, in all of the above-described Examples 1, 2, and 3, the primary air is introduced into the cylindrical passage 4 while being biased toward one side, so that it turns clockwise toward the central axis 4b of the cylindrical passage portion 4. Alternatively, a swirl flow in any one of the counterclockwise directions is provided, and the primary air flow path 3 may be provided in the tangential direction of the cylindrical passage portion 4. In addition, the aspirators 1 of the first, second, and third embodiments have been described with reference to the case where they are arranged in the vehicle air conditioner of FIG. 1, but of course, general purpose such as intake, bleed, exhaust, and decompression applications. It can also be used as an aspirator.

  In addition, this invention is not limited to the said embodiment, A design can be changed suitably as needed. In addition, constituent elements in the above embodiment include those that can be easily assumed by those skilled in the art and those that are substantially the same.

It is a layout drawing explaining arrangement | positioning of the aspirator in a vehicle air conditioner. It is sectional drawing of 1st Example of an aspirator. It is BB sectional drawing of FIG. It is sectional drawing explaining the airflow in FIG. It is sectional drawing explaining the airflow in FIG. It is a characteristic comparison figure of an aspirator. It is sectional drawing of 2nd Example of an aspirator. It is sectional drawing explaining the airflow in FIG. It is sectional drawing of 3rd Example of an aspirator. It is sectional drawing explaining the airflow in FIG. It is sectional drawing of the conventional aspirator. It is sectional drawing explaining the airflow in FIG. It is AA sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Aspirator 3 Primary air flow path 3a Center line 4 Cylindrical passage part 4b Center axis 5 Diffuser 8 Nozzle

Claims (5)

  A cylindrical passage portion provided so as to surround a tip portion of a nozzle that discharges secondary air, a primary air passage communicating with the outer periphery of the cylindrical passage portion, and a tip opening portion of the cylindrical passage portion. In an aspirator having a diffuser, the primary air flow path is disposed so that a center line of the primary air flow path is eccentric with respect to a central axis of the cylindrical passage section, and the primary air in the cylindrical passage section is disposed. An aspirator characterized in that the flow is a swirl flow.   Connected to a nozzle connected to an air pipe communicating with a room air temperature sensor for detecting room temperature of the vehicle, a cylindrical passage provided so as to surround the tip of the nozzle, and a primary air duct of the vehicle air conditioner And a vehicle air-conditioning aspirator having a primary air flow path communicating with the cylindrical passage portion and a diffuser communicating with a tip opening portion of the cylindrical passage portion, wherein the center line of the primary air flow path is An aspirator for vehicle air conditioning, wherein the aspirator for vehicle air conditioning is disposed so as to be eccentric with respect to a central axis of the cylindrical passage portion, and a primary air flow in the cylindrical passage portion is a swirl flow.   Connected to a nozzle connected to an air pipe communicating with an inside air sensor for detecting room temperature of the vehicle, a cylindrical passage provided so as to surround the outer periphery of the tip of the nozzle, and a primary air duct of the vehicle air conditioner In the vehicle air conditioning aspirator having a primary air flow path that communicates with the cylindrical passage portion and a diffuser that communicates with the open end portion of the cylindrical passage portion, the dimension value of the inner radius of the cylindrical passage portion Is R, and the dimension value from the center line of the primary air flow path to the inside of the primary air flow path is A, the center line of the primary air flow path is R-A from the central axis of the cylindrical passage portion. A vehicle air-conditioning aspirator characterized by being arranged so as to have a dimension value and an eccentric position.   Connected to a nozzle connected to an air pipe communicating with an inside air sensor for detecting room temperature of the vehicle, a cylindrical passage provided so as to surround the outer periphery of the tip of the nozzle, and a primary air duct of the vehicle air conditioner In the vehicle air conditioning aspirator, the primary air flow path communicating with the cylindrical passage portion and a diffuser communicating with the open end portion of the cylindrical passage portion, the primary air flow passage and the cylindrical passage A vehicle air conditioning aspirator characterized in that a rib is provided in the vicinity of the boundary of the section.   Connected to a nozzle connected to an air pipe communicating with an inside air sensor for detecting room temperature of the vehicle, a cylindrical passage provided so as to surround the outer periphery of the tip of the nozzle, and a primary air duct of the vehicle air conditioner And a vehicle air conditioning aspirator having a primary air passage communicating with the cylindrical passage portion and a diffuser communicating with the open end portion of the cylindrical passage portion. An aspirator for vehicle air conditioning characterized by an inclined wall.

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