JPH10246500A - Supply grill of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change a diffusion rate of blow-off air without generating a hunting in a supply grill of an air conditioner which can switch the blow-off air to a spot blow or a mild blow. SOLUTION: A suction grill 10 has an ejector structure and comprises a nozzle portion 11 which blows off main flow air A, a suction portion 12 which sucks sub flow air B which is caused by a negative pressure generated by the blow-off flow of the nozzle portion 11 and blows off such a sub flow air B, and a diffuser portion 14 which diffuses air supplied from the nozzle portion 11 and the suction portion 12. The suction portion 12 includes an approximately donut-shaped casing 12a spaced apart from the outer periphery of the nozzle portion 11. In the casing 12a, a plurality of guide vanes 13 are mounted such that they are directed to the central axis of the nozzle portion 11 while forming a spiral so that a whirling flow is formed. The whirling diameter of this whirling flow can be varied corresponding to the flow amount of the main flow air A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air outlet grill for an air conditioner, and more particularly to an air outlet grill provided near a ceiling of a bus or the like for switching conditioned air between concentrated air and diffused air. .

[0002]

2. Description of the Related Art In a blow grill of this type, when it is desired to rapidly lower the room temperature at the time of cooling start of an air conditioner (during cool down), the blow wind is a wind in which the wind speed is concentrated so-called spot wind. When the temperature is stable, it is necessary to maintain a comfortable air-conditioning temperature without direct blow to the user as a so-called mild wind in which the blown wind is weakly diffused when the temperature is stable.

[0003] Japanese Patent Application Laid-Open No. 8-338655 proposes a blow grill that satisfies such a function. The configuration is shown in FIG. This is an outlet grill 10 that can switch the outlet air flow according to the air flow rate of the air conditioner. Here, FIG. 4A shows the operation when the flow rate of the blown air introduced into the blow grill 10 is large.
(B) is a diagram showing an operation when the flow rate of the blowing air is small.

First, the configuration will be described with reference to FIG. Reference numeral 11 denotes a nozzle portion for inflow of mainstream air A blown from an air conditioner (not shown), 12 denotes a downstream side of the nozzle portion 11 and a suction portion for suctioning substream air indicated by an arrow B, and 14 denotes a downstream side of the suction portion 12. This is a diffuser section for diffusing the mainstream air A and the substream air B that have flowed in. As described above, the blowout grill 10 has a so-called well-known ejector configuration.

The inner surface on the downstream side of the diffuser portion 14 is a curved portion 14b formed in a curved shape, and is convex downward when the air conditioner is not operating (broken line M in FIG. 4A).
It has become. The curved portion 14b is formed of a thin film resin, and is configured to be deformed unevenly by an elastic force. A tube 16 is provided from below the suction part 12 to the diffuser part 14 so as to leave a predetermined space and hermetically surround the outer peripheral part, and between the diffuser part 14 and the tube 16, the inflow amount of the mainstream air A The adjusting section 17 is formed of a space for changing the curvature of the curved section 14b of the diffuser section 14 in accordance with.

The operation of the above configuration is as follows. That is, when the flow rate of the mainstream air A flowing into the nozzle portion 11 is large, such as at the time of cooling down, the diffuser B has a large suction force for the substream air B from the suction portion 12 as shown in FIG. The airflow flowing along the inner surface of the portion 14 is strong, and P3 is higher than P2, and the curved portion 14b
Has a concave shape (N in FIG. 4A). For this reason, the blowing width D is reduced, the degree of diffusion is narrowed, and a spot wind having a high wind speed is formed.

On the other hand, when the flow rate of the mainstream air A flowing into the nozzle section 11 is small, such as when the temperature is stable, the suction force of the substream air B from the suction section 12 is small as shown in FIG. Therefore, the airflow flowing along the inner surface of the diffuser portion 14 is weak, the internal pressure P2 and the external pressure P3 of the adjusting portion 17 are in a substantially equal pressure state, and the curved portion 14b has a convex shape. For this reason, the blowing width D increases, the degree of diffusion increases, and a mild wind having a low wind speed is generated.

[0008]

In the above-mentioned conventional outlet grill, a curved portion is provided as a movable portion in a diffuser portion based on an ejector structure, and a spot wind and a mild wind are formed by changing the degree of diffusion of the outlet wind. Switching has been achieved. However, as a result of the study by the present inventors, it has been found that the behavior becomes unstable in the vicinity where the curved portion (movable portion) deforms from convex to concave and from concave to convex. Specifically, when the flow velocity of the airflow flowing along the inner surface of the diffuser portion changes (near the switching point between the spot wind and the mild wind), the pressure difference between the internal pressure and the external pressure of the adjusting portion fluctuates. For this reason, a problem (hereinafter, referred to as hunting) occurs in that the curved portion frequently repeats the uneven deformation or generates an operation sound due to the uneven deformation.

[0009] The hunting causes problems such as deterioration of the curved portion and an operation sound at that time giving the user discomfort. In view of the above, the present invention has
It is an object of the present invention to provide a blower grill of an air conditioner capable of switching a blowout wind between a spot wind and a mild wind so as to make the degree of diffusion of the blowout wind variable without generating hunting.

[0010]

As a result of diligent studies, the present inventors have focused on the flow of the substream air (B) in the suction section (12), and have found that the mainstream air (A) and the substream air (B). The degree of diffusion of the mainstream air (A), that is, the degree of diffusion of the blown air, is controlled by changing the flow state in the steps (1) and (2). That is, according to the first aspect of the present invention, a nozzle unit (11) that introduces and injects air blown from an air conditioner as mainstream air (A),
The nozzle unit (1) provided near the nozzle unit (11)
A suction unit (12) for sucking the blast air as a substream air (B) by a negative pressure generated by the jet flow of 1);
A guide portion (13) provided in the suction portion (12) for rotating the sucked substream air (B) around the central axis of the nozzle portion (11); a nozzle portion (11) and the suction portion (1);
A diffuser section (14) provided downstream of 2) for diffusing the jet flow from the nozzle section (11) and the swirling flow formed by the guide section (13), and the flow rate of the mainstream air (A). By changing the swirling diameter of the swirling flow, the degree of diffusion of the blowing wind is changed.

With the above structure, the substream air (B) sucked by the suction section (12) becomes a swirling flow swirling around the central axis of the nozzle section (11) in the guide section (13). This swirling flow is generated by the diffuser section (14).
It merges with the jet (mainstream air A) from the nozzle portion (11) and flows inside the swirl as a mixed flow in which the jet flows straight. Then, the mixed flow is blown out from the diffuser section (14).

In other words, the mixed flow is as if an air wall, a so-called air curtain, was formed by the swirling flow swirling around the straight jet flow. And
As the suction force (swirl suction force) for attracting the swirl flow in the direction of the swirl axis is larger, the swirl diameter of the swirl flow becomes smaller, and the jet flow is suppressed from being diffused by the wall of the swirl flow. This swirling suction force increases as the flow rate of the mainstream air (A) increases, that is, as the flow velocity of the jet flow increases. This is because the jet flow causes a pressure difference between the inside and the outside of the swirling air curtain, but as the jet flow speed increases, the negative pressure inside the air curtain increases, and the swirling suction force also increases. Because.

That is, when the flow rate of the air blown from the air conditioner is increased at the time of cooling down or the like, the flow rate of the mainstream air (A) naturally increases. Then, the swirl suction force increases and the swirl diameter of the swirl flow decreases. For this reason, the blowout wind becomes a spot wind having a small degree of diffusion and a high wind speed, thereby enabling rapid cooling or the like. On the other hand, when the flow rate of the air blown from the air conditioner is reduced, such as when the temperature is stable, the flow rate of the mainstream air (A) naturally decreases. Then, the swirling suction force is reduced and the swirling diameter of the swirling flow is increased. For this reason, the blown wind is a mild wind having a large degree of diffusion and a low wind speed, which makes it possible to maintain a comfortable air conditioning temperature.

The present invention has a simple structure in which a so-called ejector structure is provided with a guide portion (13) for generating a swirling flow in a suction portion (12), and is provided in the above-mentioned conventional product. There are no such movable parts. Therefore, an inexpensive blowout grill that does not generate hunting can be realized. Here, as in claim 2, the suction part (12) is provided with a substantially donut-shaped casing (12) provided at an interval from the outer periphery of the nozzle part (11).
a), which sucks air from the outer peripheral side to the inner peripheral side of the casing (12a). The guide portions are provided in the casing (12a) so as to be separated from each other, and the nozzle portion ( The guide plate (13) may be a plurality of guide plates (13) spirally arranged toward the central axis of (11), and the effect according to claim 1 can be achieved.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. The outlet grill of the present embodiment is used as a plurality of outlet grills arranged in the vehicle front-rear direction near the ceiling of a passenger compartment (cabin) in a vehicle air conditioner such as a bus, for example. FIG. 1A is a cross-sectional view illustrating the overall configuration of a blowout grill 10 of the air conditioner according to the present embodiment.
1B is a cross-sectional view taken along the line CC of FIG. 1A, and FIG. 1C is a perspective view of FIG. Also, FIG.
It is a perspective view which shows the state which disassembled each component of No. 0.

The blowout grill 10 is constructed on the basis of a so-called ejector comprising a nozzle portion 11, a suction portion 12, and a diffuser portion 13, and is attached to a duct 20 disposed near the ceiling of a passenger compartment (cabin). .
The duct 20 is connected to an air conditioner (not shown),
The blast air from the air conditioner is circulated.
The blow grill 10 and the duct 20 are made of resin or the like.

In FIG. 1A, an arrow A indicates a flow of blast air (hereinafter, referred to as mainstream air A) which is blown from the air conditioner and introduced into the nozzle portion 11, and an arrow B is blown from the air conditioner. 3 shows a flow of blown air (hereinafter, referred to as substream air B) sucked into the suction unit 12 downstream of the nozzle unit 11. The approximate flow rate of the blowing air blown out from the grill is
Occupied by the flow rate of mainstream air A.

The nozzle portion 11 is arranged in a duct 20 and has a so-called hole nozzle shape in which a cylindrical tip is narrowed. The larger diameter end is the air supply inlet 11a, the smaller diameter end is the injection port 11b,
The mainstream air A is introduced from the air supply inlet 11a and
b to form an injection flow that travels straight below the injection port 11b.

The suction section 12 is located in the duct 20 near the injection port 11b of the nozzle section 11, that is, the nozzle section 11
Is located downstream of The suction part 12 has a substantially donut-shaped casing 12a, which is provided at a predetermined interval from the outer periphery of the nozzle part 11, and the nozzle part 11 is substantially the same as a donut hole of the casing 12a. It has a shape penetrating the center (see FIG. 2).
The above-mentioned predetermined interval is an interval sufficient for the suction air to be sucked into the suction portion 12 by the negative pressure generated by the jet flow from the jet port 11b.

The casing 12a includes two upper and lower cases, that is, an upper case 12b and a lower case 12c. Both cases have a donut plate shape (Fig. 2
2), and as shown in FIG.
It is superimposed on the inner surface of 2c via a plurality of guide plates 13 provided apart from each other. The outer peripheral side surface and the inner peripheral side surface of the casing 12a are open, and the auxiliary air B is sucked from the outer peripheral side opening and blown out from the inner peripheral side opening.

The guide plate 13 is shown in FIGS. 1B and 1C.
As shown in FIG. 3, a plurality of nozzles are arranged so as to spiral toward the central axis of the nozzle portion 11. These guide plates 13
Is designed to act as a guide for forming a swirling flow in which the sucked sub-flow air B swirls around the central axis of the nozzle 11. The diffuser unit 14 includes the nozzle unit 11
The suction flow and the swirl flow are introduced, and the two flows are diffused as a mixed flow. The diffuser portion 14 has a substantially cylindrical shape, and the outer peripheral surface of the diffuser portion 14 is hermetically attached and fixed to an opening 20 a provided below the duct 20.

The diffuser portion 14 is hermetically attached and fixed to the lower case 12b of the suction portion 12 in the duct 20, and the portion outside the duct 20 is increased in diameter downward. The lower end of the diffuser portion 14 constitutes a grill outlet 14a opened into the vehicle interior, and a mixed flow of the jet flow and the swirl flow is blown into the vehicle interior from the grill outlet 14a. ing.

A casing 15 is hermetically attached and fixed to the outer peripheral surface of the nozzle section 11 and the upper case 12c of the suction section 12, and is disposed in the duct 20.
Thus, the blowout grill 10 is configured. Next, the operation of the present embodiment will be described based on the above configuration. When a switch (not shown) of the air conditioner is turned on, blast air flows into the duct 20. Here, when a passenger or the like operates a blowing switch (not shown), the blowing grill 1 is opened.
Blowing air blows out from zero.

The blast air sent to the duct 20 is introduced into the nozzle section 11 as mainstream air A from an air supply inlet 11 a of the nozzle section 11. Subsequently, the introduced mainstream air A
Forms an injection flow that is blown out from the injection port 11b and goes straight down the injection port 11b. At this time, a negative pressure is generated in the vicinity of the injection port 11a by the jet flow, and at the same time, the blowing air in the duct 20 is sucked from the suction unit 12 as the substream air B by the negative pressure. The sucked side air B is
It flows inside the casing 12a along the guide plate 13 and forms a swirling flow swirling around the central axis of the nozzle portion 11.

Subsequently, the mainstream air A which has become the jet flow and the substream air B which has become the swirling flow flow into the diffuser section 14. In the diffuser section 14, the two airs merge and the swirling flow becomes a mixed flow swirling around the jet flow, and is blown into the vehicle interior from the grill outlet 14a. By the way, according to the present embodiment, the degree of diffusion of the blown air blown into the vehicle interior can be changed by changing the flow rate of the mainstream air A. Here, the flow rate of the blown air is variable by changing the fan speed of the air conditioner or the like.

As shown in FIG. 3 (a), when the flow rate of the mainstream air A, that is, the flow rate of the jet flow is large, the blowout wind becomes a spot wind having a small diffusion degree, and as shown in FIG. When the flow rate of the jet flow, that is, the flow rate of the jet flow, is small, the blown wind becomes a mild wind having a large diffusion degree. The blowing wind is
The jet flow (mainstream air A) is a mixed flow in which the jet flow (mainstream air A) goes straight inside the swirling flow (substream air B). In other words, it is as if an air wall by a swirling flow, that is, an air curtain, was formed around the jet flow.

The larger the suction force that attracts this swirling flow in the direction of the swirling axis, that is, the larger the swirling suction force F, the smaller the swirling diameter of the swirling flow, and the jet flow can be suppressed from diffusing by the wall of the swirling flow. The degree decreases. Here, the turning suction force F increases as the flow rate of the mainstream air A increases, that is, as the flow velocity of the jet flow increases. This is because the jet flow causes a pressure difference between the inside and the outside of the swirl flow air curtain. As the flow speed of the jet flow increases, the negative pressure P inside the swirl flow increases, and the swirling suction force F also increases. It is because it becomes.

That is, when the flow rate of the air blown from the air conditioner, that is, the flow rate of the mainstream air A is large, the swirl suction force F is also large, so that the swirl diameter of the swirl flow is small. For this reason, the blowing wind can be a spot wind having a small degree of diffusion and a high wind speed. On the other hand, when the flow rate of the blown air from the air conditioner, that is, the flow rate of the mainstream air A, is small, the swirl suction force F is also small, and the swirl diameter of the swirl flow is large. Therefore, the blowing wind can be a mild wind having a large diffusion degree and a low wind speed.

Further, according to the present embodiment, as the flow rate of the mainstream air A increases (the negative pressure P increases), the jet flow is narrowed, the swirl diameter of the swirl flow decreases, and the flow speed of the swirl flow itself increases. And the swirling component around the jet flow increases.
As a result, the air curtain effect of the swirling flow becomes large, and the blown wind becomes difficult to diffuse. That is, in the present embodiment, even if the mainstream air flow rate is increased, there is no possibility that the spot wind will be disturbed.

Thus, according to the present embodiment, when the flow rate of the air blown from the air conditioner is increased at the time of cooling down or the like, the local rapid cooling can be performed by the spot wind. When the flow rate of the blast air from the device is reduced, the gentle wind blows a gentle wind over a wide area of the vehicle compartment, so that the air conditioning temperature can be maintained comfortably.

In this embodiment, a guide plate 1 for generating a swirling flow is provided in a so-called ejector structure comprising a nozzle portion 11, a suction portion 12, and a diffuser portion 14.
3 is provided in the suction section 12 and is inexpensive and simple. The movable section of the diffuser section, which is provided in the conventional product described above, can be eliminated, and the blowing air can be diffused without hunting. The degree can be changed. (Other Embodiments) A guide plate as a guide portion is
The shape is not limited to the shape of the above embodiment, and may be, for example, a scroll shape (a so-called spiral mosquito coil) extending toward the central axis of the nozzle portion. Thereby, the same swirling flow as in the above embodiment can be generated.

Further, as the guide portion, for example, a pipe having a spiral shape toward the center axis of the nozzle portion or a plurality of pipes arranged in a spiral shape may be used. Can occur. Note that the shape of the casing of the suction unit and the shape of the nozzle unit and the diffuser unit are not limited to those in the above-described embodiment, and it is a matter of course that various designs may be changed according to the application and installation location of the blowout grill. .

In the air conditioner for a vehicle such as a bus, the installation location of the blowout grill of the air conditioner of each of the above embodiments is not limited to the duct near the ceiling. It may be installed nearby. Further, the present invention can be applied to a home-use air conditioner, for example, an air conditioner having an outlet grill on a ceiling or a wall.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing an entire configuration of a blowout grill of an air conditioner according to an embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line CC of FIG. 1A, and FIG. It is a perspective view.

FIG. 2 is a perspective view showing a state in which each component of the outlet grill of the embodiment is disassembled.

FIG. 3 is a schematic diagram showing the degree of diffusion of blown air in the embodiment, and FIG.
(B) shows a case where the blown air flow rate is small.

FIG. 4 is a cross-sectional view showing the entire configuration of a blow-off grill of a conventional air conditioner.

[Explanation of symbols]

11 nozzle part, 12 suction part, 12a casing,
13: guide plate, 14: diffuser section, A: mainstream air, B: sidestream air.

Claims (2)

[Claims] 1. A nozzle section (11) for introducing and injecting blast air from an air conditioner as mainstream air (A), and a nozzle section (11) provided near the nozzle section (11), the jet flow of the nozzle section (11). Suction unit (12) for sucking the blast air as the substream air (B) by the negative pressure generated by
A guide section (13) provided in the suction section (12) and configured to rotate the sucked substream air (B) around a central axis of the nozzle section (11); A diffuser section (14) provided downstream of the suction section (12) and diffusing the jet flow from the nozzle section (11) and the swirling flow formed by the guide section (13); A blow grill for an air conditioner, wherein the degree of diffusion of blown air is variable by changing the swirl diameter of the swirl flow according to the flow rate of (A). 2. The suction section (12) has a substantially donut-shaped casing (12a) provided at an interval from the outer periphery of the nozzle section (11).
a) for sucking the substream air (B) from the outer peripheral side to the inner peripheral side of a), wherein the guide portions are provided in the casing (12a) so as to be separated from each other, and the nozzle portion (11) is provided. 2. The blow-out grill of an air conditioner according to claim 1, wherein the plurality of guide plates are arranged spirally toward the central axis of the air conditioner.