JP2800138B2 - Aspirator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aspirator for use in a vehicle air conditioner.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, an aspirator 1 used in a conventional automobile air conditioner has a primary air duct 2 as shown in FIG.
A curved passage whose inlet side is connected to a primary air suction port 3 provided on the side surface of which is curved at an intermediate portion so that an outlet side 4a is directed substantially in the direction in which the primary air flows. Part 4, a diffuser 5 connected to the outlet side 4a of the curved passage part 4 and having a throat on the outlet side 4a, and one end part
Communicates via the air pipe 7 into the inside air sensor 6 for room temperature sensing and the other end opened to the throat portion 5b of the diffuser 5, the inside air sensor 6 by the suction force of the primary air flow in the throat portion 5b
And a nozzle 8 that sucks in-vehicle air (secondary air) through the nozzle. The diffuser 5 and the nozzle 8 are
The axis 5a, 8a is the axis of the outlet side 4a of the curved passage portion 4.
(Note that the axis is the axis of the curved passage portion 4 on the outlet side 4a.
Curved line section so that it almost coincides with the line passing through
4 attached. Note that 9 and 10 each represent 1
A blower and an evaporator provided in the secondary air duct 2.

[0003]

As a result of the study by the present inventor, it has become clear that the aspirator 1 has the following problems. That is, in the aspirator 1, part of the primary air flowing through the primary air duct 2 enters the throat portion 5 b of the diffuser 5 from the primary air inlet 3 through the curved passage portion 4, and enters the diffuser 5.
The primary air flow, which has a substantially uniform wind velocity distribution at the primary air inlet 3, is generally bent at substantially 90 degrees, and the primary air flow is bent at approximately 90 degrees.
As shown in FIG. 5, the outlet side 4a of the
The axis of the outlet side 4a (in the prior art described above, the diffuse
When the user 5 is connected to the curved passage part 4, this axis
A curved wind speed distribution 11 having a maximum wind speed portion 11a is provided at a position deviated from the axial center 5a of the fuser 5) . Therefore, in the aspirator 1, the axis 8 a of the nozzle 8 is shifted downward from the maximum wind speed portion 11 a of the wind speed distribution 11, so that the opening 8 b of the nozzle 8 on the diffuser 5 side draws the primary air flow rate, that is, suction by the air flow. The force became small, and sufficient secondary air did not flow into the inside air sensor 6 to detect the temperature in the cabin. That is,
The inside air sensor does not accurately detect the temperature in the cabin, and therefore, the air-conditioning controllability is deteriorated. The inside air sensor 6 outputs a temperature higher than room temperature due to heat generation of the sensor itself when the speed of the secondary air to be sucked is low, and outputs a temperature lower than room temperature when the speed of the intake air is high.

An object of the present invention is to provide an aspirator for accurately detecting the temperature in a vehicle compartment without changing the shapes of a primary air intake port 3, a curved passage portion 4, a diffuser 5, and a nozzle 8, that is, the external shape of the aspirator. I do.

[0005]

To solve the above problems SUMMARY OF THE INVENTION The present invention, the inlet-side flow Ru is connected to the primary air inlet provided on the side surface of the primary air duct which forms an air passage of the automotive air conditioner a road and an intermediate portion is curved outlet side about the primary curved passage portion that will be to face the direction of flow of the air, connected to the outlet side of the curved passage portion has a throat portion on the outlet side Diffuser and exit side of curved passage
Is mounted so that its axis is substantially parallel to its own axis , one end thereof communicates with an inside air sensor for detecting room temperature, and the other end thereof has a nozzle which opens to the throat portion of the diffuser.
The secondary air is discharged to the outside through the primary air inlet, the curved passage, and the diffuser, and is discharged into the throat of the diffuser.
An aspirator for inhaling secondary air in a vehicle cabin to an inside air sensor through a nozzle by a suction force of a secondary air flow, wherein an axis of the nozzle is moved from an axis on an outlet side of a curved passage portion to a primary air suction port.
The diffuser is configured to be shifted by a predetermined amount to the side opposite to the inlet to substantially match the maximum wind speed portion of the primary air wind speed distribution in the throat portion of the diffuser.

[0006]

The axial center of the nozzle is shifted by a predetermined amount from the axis on the outlet side of the curved passage portion to the side opposite to the primary air suction port, and substantially matches the maximum wind speed portion of the wind speed distribution of the primary air in the throat portion of the diffuser. As a result, the wind speed of the primary air, and hence the suction force, increases at the opening of the nozzle that opens in the throat of the diffuser, the secondary air in the vehicle interior flows into the inside air sensor sufficiently, and the inside air sensor accurately detects the vehicle. Detect indoor temperature.
Also, if the suction force is large, when the temperature in the vehicle interior changes, the temperature-changed air quickly reaches the inside air sensor. When
At this time, the wind speed of the primary air passing through the diffuser
It changes depending on the position of the aspirator. In the present invention
Is the maximum wind in the throat of the diffuser
It is arranged so that it matches the speed
If you can set the degree to the conventional level, diffuser
The maximum wind speed in the throat of the nose is the axis on the exit side of the curved passage
(In the prior art, it coincides with the axis of the nozzle)
If the position is equal to or higher than the wind speed,
Position can be changed. In addition,
In the morning, the nozzle should be located in the area where the primary air velocity is high.
And the change in the primary air velocity due to the change in vehicle speed
Can have a margin. That is, even if the wind speed of the primary air flow slightly changes due to a change in the outside air pressure or the like, the wind speed at the axial center position of the nozzle is equal to or higher than the wind speed on the axis on the outlet side of the curved passage portion .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The same components as those of the conventional aspirator 1 are denoted by the same reference numerals, and description thereof will be omitted. In the aspirator 21 of the present invention, the diffuser 5 is positioned such that the axis 5a is shifted from the axis of the outlet side 4a of the curved passage portion 4 to the side opposite to the primary air inlet 3 (upward in FIG. 1). Is connected to the outlet side 4a of the curved passage portion 4. Nozzle 8
Are curved passage portions 4 so as to be substantially coaxial with the diffuser 5.
The axis 8a is shifted from the axis of the outlet side 4a of the curved passage portion 4 to the side opposite to the primary air inlet 3 (upward in FIG. 1). Note that the axis 5a of the diffuser 5 and the axis 8a of the nozzle 8 are both disposed almost on the maximum wind speed portion 11a of the wind speed distribution 11 in the throat 5b of the diffuser 5. In addition,
In the described embodiment, the axis 5a of the diffuser 5 and the
The axis 8a of the chisel 8 is connected to the axis of the outlet side 4a of the curved passage portion 4.
And arranged so as to coincide with the maximum wind speed part 11a.
Although the embodiment has been described, the axis 8a of the nozzle 8 is
Maximum wind speed part of the wind speed distribution 11 in the throat 5b of the fuser 5
11a as long as it is located above the diffuser.
The user 5 has its axis 5a coincident with the maximum wind speed portion 11a.
It does not need to be arranged in such a way. For example, the axis of the nozzle 8
Only the core 8a is arranged on the maximum wind speed portion 11a, and the diffuser
5, the axis 5a coincides with the maximum wind speed portion 11a and the axis 8a.
It is good also as a structure arrange | positioned in the position which is not carried out. However, as mentioned above
The axis 8a of the nozzle 8 and the axis 5 of the diffuser 5
a, the efficiency of the suction force due to the primary air flow in the opening 8b between the opening 8b of the nozzle 8 and the throat 5b of the diffuser 5 is improved. Therefore, it is necessary to secure a gap of at least 2 mm.

FIG. 2 shows a primary air inlet 3, a curved passage 4,
And the aspirator 21 without changing the shape of the nozzle 8 at all.
When the shaft center 8a of the nozzle 8 and the shaft center 5a of the diffuser 5 are moved above the positions of the shaft centers 5a and 8a of the conventional aspirator 1, the shaft center up amount (mm) and the inside air sensor 6 flow. The relationship with the increase ratio of the inflow amount of secondary air is shown. According to FIG. 2, the axis 8a of the nozzle 8 and the axis 5a of the diffuser 5 are connected to the axes 5a, 8a of the conventional aspirator 1.
Is moved 2.5 mm above the position, the increase ratio of the inflow amount of the secondary air flowing into the inside air sensor 6 is maximized. In this case, the axis 8a of the nozzle 8 and the axis 5a of the diffuser 5 are located substantially on the maximum wind speed portion 11a of the wind speed distribution 11.

[0009]

As described above, the present invention provides a primary air intake port, a curved passage portion, and a nozzle which constitute an aspirator .
Without changing the shape at all, the center of the diffuser and the nozzle is shifted from the conventional position to the side opposite to the primary air inlet, and almost matches the maximum wind speed part of the wind speed distribution in the throat of the diffuser. Since the secondary air is supplied to the inside air sensor so that the sensor exerts its function sufficiently, the temperature in the vehicle compartment can be accurately detected despite its simple structure. Further, since the suction force is large, when the temperature in the vehicle interior changes, the temperature-changed air quickly reaches the inside air sensor. Accordingly, the responsiveness of temperature detection is improved. By the way, in an air conditioner for an automobile, outside air is often introduced into a primary air duct, and in that case, a wind speed of the primary air changes due to a change in an outside air pressure accompanying a change in a vehicle speed. However, in the present invention, the axial center is 1 at the outlet side of the curved passage portion.
Since the nozzles are arranged so as to substantially match the maximum wind speed portion of the wind speed distribution of the next air, it is possible to provide a margin for such a change in the wind speed. That is, due to changes in the outside air pressure, even if a little change in velocity of the primary air flow, wind speed at a central axial position of the nozzle, the axis of the outlet side of the curved path portion
Since the wind speed is equal to or higher than the wind speed (which coincides with the axis of the diffuser in the related art) , the detection accuracy and the response of the room temperature can be secured. The detection accuracy of the vehicle interior temperature, if you are ready to execute the conventional order of levels, the maximum wind speed, the outlet of the curved passage portion
The position at which the aspirator is provided can be changed within a range where the wind speed is maintained at the position on the side axis . In other words, aspirin
The range in which the radiator can be provided can be expanded,
The degree of freedom in designing the primary air duct and the aspirator can be increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view of one embodiment.

FIG. 2 is a diagram illustrating a relationship between an increase amount when an axis of a nozzle and a diffuser is raised from a conventional position and an increase ratio of an amount of secondary air passing through an inside air sensor;

FIG. 3 is a diagram showing a general arrangement relationship of a primary air duct, an aspirator, and an inside air sensor.

FIG. 4 is a longitudinal sectional side view of a conventional aspirator.

FIG. 5 is a wind speed distribution diagram of primary air at an outlet side of a curved passage portion.

[Explanation of symbols]

 2 Primary air duct 3 Primary air intake 4 Curved passage 5 Diffuser 6 Inside air sensor 8 Nozzle 21 Aspirator

Claims (1)

(57) [Claims] 1. A is an intermediate portion a flow path inlet side Ru is connected to the primary air inlet provided on the side surface of the primary air duct which forms an air passage of the automotive air conditioner is curved outlet side approximately 1 a curved passage portion that will be to face the direction of flow of the following air, connected to the outlet side of the bending passage portion, and a diffuser having a throat portion to the outlet side, the axis of the outlet side of the curved passage portion The axis of my own
URN mounted in parallel, one end communicates with the inside air sensor for room temperature sensing, the other end before the diffuser
And a nozzle which opens into serial throat, primary air is the primary air inlet, the curved passage portion and the front
Is discharged to the outside via the serial diffuser, the secondary air in the passenger compartment to the inside air sensor through the Roh <br/> nozzle by the suction force of the primary air flow in the throat of the Difuyu <br/> The An aspirator for suctioning, wherein an axis of the nozzle is aligned with an axis on the outlet side of the curved passage portion.
A predetermined amount from the line to the side opposite to the primary air inlet,
Aspirator, characterized in that to substantially conform to the maximum wind of wind speed distribution of the primary air in the throat of the diffuser.