JP2000280736A - Blowout grill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blowout grill of an air conditioner, capable of drastically extending the arrival distance of air to be blown off from a blowoutlet. SOLUTION: A grill A of an air conditioner is provided with a grill inner cylinder 1, a grill outer cylinder 2 and a rectifying net 3. A main vent passage 4 having the main vent passage outlet lengths Sa, Sb and the main vent passage inlet lengths Sa', Sb' is formed in the grill inner cylinder 1, and a sub vent passage 5 having the sub vent passage outlet lengths ta, tb and the sub vent passage inlet lengths ta', tb' is formed between the grill inner cylinder 1 and the grill outer cylinder 2. The sub flow velocity ratio V2/V1, namely, (the flow velocity V2 of air passing through a sub vent passage outlet 51)/(the flow velocity V1 of air passing through a main vent passage outlet 41) is set in the range of 0.45 to 0.55. The sub flow thickness ratio ta/a=tb/b, namely, (the sub vent passage outlet length ta)/(the vent passage outlet length (a))=(sub vent passage outlet length tb)/(vent passage outlet length (b)) is set in the range of 0.21 to 0.28.

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.

[0002]

2. Description of the Related Art A main ventilation path through which high-velocity air flows flows is formed inside a partition wall, and a sub-airflow path through which low-speed air flows flows forms outside a partition wall. A grille of an air conditioner in which the length is extended is conventionally known (JP-A-10-68548).

[0003]

Although the grill of this air conditioner can extend the reach of the air blown out from the outlet, the grille of the air conditioner does not describe the relationship between the main air passage and the sub air passage. The effect is not very noticeable. By the way, as a result of the study by the present inventors, it has been found that a wind speed ratio (a substream speed ratio in the claims) passing through each ventilation path affects the reach of the conditioned air. In particular, in the case of a vehicle having a high degree of opening, the occupant is exposed to the outside air. Therefore, in order to enhance the comfort of the occupant, it is necessary to further extend the reach of the conditioned air blown from the outlet. The purpose of the present invention is
It is an object of the present invention to provide a blower grill of an air conditioner capable of greatly extending the reach of air blown from a blower outlet.

[0004]

According to a first aspect of the present invention, there is provided a blower grill of an air conditioner having a grill inner cylinder having an outer shape of a truncated pyramid, and a ventilation passage outlet length of a, b (where a ≧ b). And a grill outer cylinder surrounding the grill inner cylinder with a rectangular cross section.

A main air passage having a main air passage outlet length of sa and sb and a main air passage inlet length of sa 'and sb' is formed in the inner cylinder of the grill, and a sub air passage outlet length of ta and tb is a sub air passage. air passage inlet length ta ', tb' sub air passage of formed between the grill cylinder and grills outer cylinder, the sub-flow velocity ratio V ₂ / V _1, namely,
(Flow velocity V _{2 of} air passing through outlet of sub-air passage) / (Flow velocity V _{1 of} air passing through outlet of main ventilation passage) is 0.45 to 0.5
5 and the auxiliary flow thickness ratio ta / a = tb /
b, that is, (sub-air outlet length ta) / (air passage outlet length a) = (sub-air outlet length tb) / (air passage outlet length b) is in the range of 0.21 to 0.28. .

[0006] As shown in the image of (a, b) of FIG.
The secondary flow blown out from the secondary ventilation passage acts to reduce the relative velocity difference with the surrounding air at the expense of the air itself, reduce the amount of entrainment, and extend the reach of the main flow.

The numerical limitation on the preferable range of the side stream speed ratio V ₂ / V ₁ is based on the following reasons. To extend the reach of mainstream wind (raise the ultimate temperature of the air flow at a given distance), the sub-flow velocity ratio V ₂ / V _1, i.e., (velocity V ₂ of the air passing through the secondary air passage outlet) / ( the flow velocity V ₁₎ of air passing through the main air passage outlet is set in the range of 0.45 to 0.55 (see FIG. 4).

The numerical limitation on the preferable range of the substream thickness ratio ta / a = tb / b is based on the following reason. As shown in the image diagram of FIG.
a) / (Ventilation path exit length a)｝ = ｛(Sub ventilation path exit length t
If b) / (ventilation passage exit length b)｝ <0.21, the potential of the sub-assisted airflow blown out of the sub-airflow passage outlet is small and the sacrificial portion is small, so that the mainstream airflow blown out of the main airflow passage outlet Is difficult to protect, and the mainstream air blown out from the outlet of the main ventilation path is immediately decelerated. FIG.
(B), {(sub-air outlet length ta) / (air passage outlet length a)} = {(sub-air outlet length t)
If b) / (ventilation path exit length b) ８> 0.28, the reach of the mainstream air blown from the exit of the main ventilation path becomes poor because the potential is small.

(Regarding Claim 2) Extending the reach of the mainstream air (increase the reach temperature of the airflow at a predetermined distance)
The needs secondary flow velocity ratio V ₂ / V _1, the set in the range of 0.45 to 0.55 (see FIG. 4). Side flow speed ratio V
₂ / V ₁ is the ratio of the entrance area and the exit area of the main ventilation path and the sub ventilation path, that is, (the entrance area Asi of the sub ventilation path / the exit area Aso of the sub ventilation path) / (the entrance area of the main ventilation path) Ami / the exit area of the main ventilation path (Amo).

In view of this, the area (Asi
/ The exit area Aso of the sub-ventilation path / (the entrance area Ami of the main ventilation path / the exit area Amo of the main ventilation path) is 0.45-0.
55, the sub-ventilation passage entrance lengths ta ′, t
b ′ and the main ventilation path entrance lengths sa ′ and sb ′ are set.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention (claims 1 and 2)
Will be described based on FIGS. 1 to 5. The grill A of the air conditioner includes a grill inner cylinder 1, a grill outer cylinder 2 surrounding the grill inner cylinder 1, and a rectifying net 3 for rectifying air flowing into the cylinder. The main ventilation path 4 is formed, and the sub ventilation path 5 is formed between the grill inner cylinder 1 and the grill outer cylinder 2.

The grill A of the air conditioner is used as an air outlet of the air conditioner of the agricultural tractor 6 shown in FIG. Then, as shown in FIG.
The blowing direction of 0 is variable (see arrow), and blows warm air or cold air toward the upper body of the occupant from the left and right directions of the driver's seat. In addition, in FIG.
2 is an air conditioning unit, 63 is a metal cover, and 64 is a pedal.

The grill inner cylinder 1 (made of plastic) is a hollow body having a rectangular opening cross section and a truncated quadrangular pyramid with a tapered outer shape. Grill outer cylinder 2 (made of plastic) has a rectangular opening cross section (a = 84 mm, b = 58 mm, L = 50).
mm), and surrounds the grill inner cylinder 1. The grill inner cylinder 1 is fixed to the grill outer cylinder 2 by a cross-shaped support plate (not shown).

In this embodiment, the substream thickness ratio ta / a = tb
/ B, that is, (ta) is set to 21 mm so that (sub-air outlet length ta) / (air passage outlet length a) = (sub-air passage outlet length tb) / (air passage outlet length b) becomes 0.25. , Tb is 14.5
mm.

Further, the sub-flow velocity ratio V ₂ / V ₁ , that is, (the flow velocity V _{2 of} the air passing through the sub-ventilation exit 51) / (the flow velocity V _{1 of} the air passing through the main ventilation-pass exit 41) is 0. The ratio of the entrance area and the exit area of the main ventilation path 4 and the sub ventilation path 5 so as to be 0.5, that is, (the entrance area Asi of the sub ventilation path 5 / the exit area Aso of the sub ventilation path 5) / (main Entrance area Ami of ventilation passage 4
/ The exit area Amo of the main ventilation path 4 is set.

The rectification net 3 has a mesh of 0.7 mm × 0.2 mm.
It is a 7 mm resin mesh and is attached to the air inflow side of the grill outer cylinder 2 including the grill inner cylinder 1, and rectifies the air flowing into the grill inner cylinder 1 and the grill outer cylinder 2.

Next, an experiment for verifying the reach of the conditioned air between the comparative product and the grill A of the air conditioner will be described. Prepare a comparative product with the grill inner cylinder 1 removed and grill A,
Blow-out temperature 50 ° C, outside air temperature 5 ° C, 800m from grill A
When the ultimate temperature was measured at a measurement point m away,
Although the temperature was 19 ° C. for the comparative product, the temperature of grill A was 26.4 ° C., and the reach of the conditioned air could be greatly extended.

Next, the auxiliary flow thickness ratio of the grill A of the air conditioner will be described.
ta / a = tb / b, sidestream speed ratio V _Two/ V₁, And open
An experiment based on which the mouth area is determined is described. Ambient temperature
At a temperature of 5 ° C and a grill outlet temperature of 50 ° C.
At the time of 3, 0.5, 0.7, the substream thickness ratio,
Between the temperature reached at the measurement point 800 mm away from the
I checked the staff. FIG. 4 shows the results. In any open area
However, the side flow velocity ratio V_Two/ V₁Is 0.5, and the substream thickness ratio t
a / a = tb / b = 0.25 is the highest attained temperature
Results were obtained.

Next, an experiment for examining the relationship between the opening area and the temperature arrival rate will be described. 800 m from the grill in a free-jet grill with the grill inner tube removed and a side-flow grill with the grill inner tube of various opening areas
The air temperature at a measurement point m away was measured.

The temperature arrival rate was determined based on the following equation. Temperature arrival rate = (atmosphere temperature−temperature at measurement point) / (atmosphere temperature−outlet temperature) As shown in the graph of FIG. 5, regardless of the opening area, the grill with the side stream having the grill inner cylinder is more suitable. It was found that the temperature attainment rate was higher than that of the free jet grill with the inner tube removed. It was also found that the larger the opening area, the higher the opening area. However, in the case of a vehicle, the upper limit is about 5000 mm ^{2 due} to space limitations.

Next, advantages of this embodiment will be described. [A] Secondary flow velocity ratio V ₂ / V ₁ , that is, (Sub-air outlet 5
1 so that the flow velocity V _{2 of} the air passing through 1 / (the flow velocity V _{1 of} the air passing through the exit 41 of the main ventilation path) becomes 0.5, the entrance area and the exit area of the main ventilation path 4 and the sub ventilation path 5. Ratio, ie,
(Inlet area Asi of sub ventilation path 5 / Outlet area Aso of sub ventilation path 5) / (Inlet area Ami of main ventilation path 4 / Main ventilation path 4)
With the exit area Amo) of the sub-flow thickness ratio ta
/ A = tb / b, that is, (sub air outlet length ta) / (air outlet length a) = (sub air outlet length tb) / (air outlet length b) is set to 0.25. I have.

The sub-airflow blown from the sub-airflow path 5 acts to reduce the relative velocity difference with the surrounding air at the expense of the self-airflow, reduce the amount of entrainment, and extend the reach of the main airflow. Since the substream thickness ratio ta / a = tb / b is 0.25, the ratio of the potential of the mainstream wind blown from the outlet of the main ventilation path to the potential of the substream wind blown from the exit of the subairflow path is determined. Since it is appropriate and the substream effectively protects the mainstream blown out from the main vent outlet, the mainstream blown out from the main vent exit can reach far. For this reason, for example, when used under the scorching sun, cold air can be strongly applied to the occupant, and the comfort can be improved.

[A] A grill inner cylinder 1 is provided, and a substream speed ratio V
And ₂ / V _1, since it is only necessary to define a substream thickness ratio ta / a = tb / b, can be prepared grill A of the air conditioner at low cost.

[C] The characteristic curve of the number of rotations of the blower can be reduced as long as the reach of the conditioned air blown out from the grill A of the air conditioner is not shortened, so that energy can be saved.

The present invention includes the following embodiments in addition to the above embodiment. a. Although the aspect ratio of the ventilation path exit length a: the ventilation path exit length b may be any number, the ventilation path exit length b ≧ 30 mm is required. Further, the length L of the grill is preferably 30 mm to 70 mm. If the length L is less than 30 mm, the effect of the sidestream wind is small, and if it exceeds 70 mm, it is difficult to establish a grill.

B. It is preferable to attach a grill to a construction machine vehicle such as a forklift or a crane because the air conditioning feeling is improved.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of a grill of an air conditioner according to one embodiment of the present invention.

FIG. 2 is an explanatory view of an agricultural tractor equipped with the grill of the air conditioner.

FIG. 3 is an enlarged view of a main part of a portion where the grill of the air conditioner is mounted.

FIG. 4 is a graph showing the relationship between the substream thickness ratio and the ultimate temperature at each substream velocity ratio for each opening area.

FIG. 5 is a graph showing the relationship between the opening area and the temperature attainment rate in a grill with a free jet and a grill with a substream.

FIG. 6 shows the velocity distribution (a) of the blown air when the substream thickness ratio ta / a = tb / b = 0.24, and the substream thickness ratio ta / a.
It is explanatory drawing which shows the velocity distribution (b) of the blowing wind at the time of = tb / b = 0.35.

FIG. 7: Thickness ratio of side stream (ta / a) = (tb / b) <0.
21 is an explanatory diagram showing the velocity distribution (a) of the blowing wind at 21 and the velocity distribution (b) of the blowing wind at the time of the substream thickness ratio (ta / a) = (tb / b)> 0.28. is there.

[Explanation of symbols]

1 Grill inner cylinder 2 Grill outer cylinder 3 Rectifier net a, b Ventilation path exit length sa, sb Main ventilation path exit length sa ', sb' Main ventilation path entrance length ta, tb Secondary ventilation path exit length ta ', tb' Sub inlet area of the outlet area Ami main ventilation channel of air passage inlet length V ₂ sub air passage flow rate of the air Asi passing through the flow velocity V ₁ main air passage outlet of the air passing through the outlet sub air passage inlet area Aso sub ventilation channel of Amo Exit area of main ventilation path

Claims (2)

[Claims] 1. A grill inner cylinder having an outer shape of a truncated quadrangular pyramid, and a grill outer cylinder surrounding the grill inner cylinder with a ventilation passage outlet length of a, b (where a ≧ b) is a rectangular cross section. The main ventilation path exit length is sa and sb, and the main ventilation path entrance length is s
The main ventilation passages a ′ and sb ′ are formed in the inner cylinder of the grill, the exit lengths of the sub ventilation passages are ta and tb, and the entrance lengths of the sub ventilation passages are ta ′ and t.
b ′ is formed between the grill inner cylinder and the grill outer cylinder, and the sub-flow velocity ratio V ₂ / V ₁ , that is, (flow velocity V _{2 of} air passing through the sub-air outlet) / set (main air passage air flow rate V ₁ passing through the outlet) in the range of 0.45 to 0.55, and, side-stream thickness ratio ta / a = tb / b, i.e., (sub air passage outlet An outlet grill, wherein (length ta) / (air passage outlet length a) = (sub air passage outlet length tb) / (air passage outlet length b) is in the range of 0.21 to 0.28. 2. The sub-flow velocity ratio V ₂ / V ₁ is a ratio of the entrance area and the exit area of the main ventilation path and the sub-ventilation path, that is, (the entrance area Asi of the sub-ventilation path / the sub ventilation path). Is determined by the following formula: (Exit area Aso) / (entrance area Ami of main ventilation path / exit area Amo of main ventilation path). This (the entrance area Asi of sub ventilation path / exit area Aso of sub ventilation path) / (of the main ventilation path) The sub ventilation path entrance lengths ta ′ and tb ′ and the main ventilation path entrance lengths sa ′ and sb ′ are set so that the entrance area Ami / the exit area Amo of the main ventilation path is in the range of 0.45 to 0.55. The blow-off grill according to claim 1, which is set.