JPH11294825A - Ventilation equipment - Google Patents

Abstract

(57) [Summary] [Problem] To provide a ventilator capable of securing an airflow as much as possible and suppressing operation noise even when pressure loss of an airway is large. SOLUTION: A main ventilation casing 14 having a blower 15 is provided in a main body casing 11 having a first exhaust pipe 12 at a discharge end, and a discharge end of the forced ventilation wind path 14 is connected to a second exhaust pipe 19. In the ventilator which is opened at the discharge end of the main body casing 11 through the natural ventilation wind path 17 which forms a bypass for the forced ventilation air path 14 between the forced ventilation air path 14 and the main body casing 11, First exhaust pipe 12
Wherein the ratio of the discharge end opening area of the second exhaust pipe 19 to the discharge end opening area is approximately 0.25 to 0.8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation device, and more particularly, to a body casing having a first exhaust pipe at a discharge end, which is provided with a forced ventilation air passage having a blower. Was opened to the discharge end of the main body casing through the second exhaust pipe, and a natural ventilation air path was formed between the forced ventilation air path and the main body casing to form a bypass for the forced ventilation air path. It relates to a ventilation device.

[0002]

2. Description of the Related Art A ventilation device of the above-mentioned type is mounted, for example, on a ceiling in a house, and is used as a ventilation fan for discharging indoor air to the outside. In this type of ventilation fan, the outlet of the blower is configured to coincide with the outlet of the main body casing, and the exhaust port of the blower and the exhaust port of the main body casing for connecting it to an external duct are the same. It is configured.

[0003]

However, in the ventilating device having the above-described structure, if the duct piping for exhausting air from the exhaust port to the outside is too long, or if there is a bent portion with a large curvature in the duct, the wind path may be damaged. However, there is a disadvantage that the pressure loss increases and the noise during operation increases.

Accordingly, an object of the present invention is to provide a ventilator capable of securing an air flow as much as possible even when the pressure loss of an air passage is large and suppressing operation noise.

[0005]

Means for Solving the Problems To solve the above problems, the invention according to claim 1 includes a forced ventilation air passage having a blower in a main body casing having a first exhaust pipe at a discharge end, The discharge end of the forced ventilation air passage is opened to the discharge end of the main body casing through the second exhaust pipe, and natural ventilation forming a bypass between the forced ventilation air passage and the main body casing is provided. In the ventilation system that formed the airway,
The ratio of the discharge end opening area of the second exhaust pipe to the discharge end opening area of the first exhaust pipe is approximately 0.25 to 0.8.

According to a second aspect of the present invention, in the ventilator according to the first aspect, the first exhaust pipe and the second exhaust pipe each have a substantially circular cross section, and a discharge end opening of the second exhaust pipe. The diameter ranges from 0.5 times the discharge end opening diameter of the first exhaust pipe to 0.9 times the discharge end opening diameter of the main casing.

According to a third aspect of the present invention, in the ventilating apparatus according to the first aspect, the forced ventilation air passage is configured as a structure independent of the main body casing, and the forced ventilation air passage is detachably mounted in the main body casing. It is characterized by being attached.

The invention according to claim 4 is the invention according to claims 1 to 3
The venting device according to any one of the above, characterized in that the discharge end of the first exhaust pipe protrudes into the second exhaust pipe.

The invention according to claim 5 is the invention according to claims 1 to 4.
The ventilator according to any one of the above, wherein the blower is a sirocco fan, and the blower is integrally formed with a forced ventilation wind path.

According to a sixth aspect of the present invention, in the ventilating apparatus according to the third aspect, the forced ventilation air path is eccentric as viewed from the ventilation direction so as to form a bypass air path for the forced ventilation air path in the main body casing. It is characterized by being arranged.

According to a seventh aspect of the present invention, in the ventilating apparatus according to the sixth aspect, the axis of the second exhaust pipe is aligned with the axis of the upper opening of the main body casing. is there.

According to an eighth aspect of the present invention, in the ventilator according to any one of the first or third to seventh aspects, the discharge end opening shape of the second exhaust pipe is substantially rectangular. Things.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 shows a first embodiment of the present invention. The ventilation device 10 according to the first embodiment is configured in a main body casing 11, and a lower end of the ceiling plate 2
Is attached to the edge 3 arranged along the opening edge of the ceiling plate 2 using a fastening member (not shown) so as to be located substantially above the ceiling plate 2. The opening of the ceiling plate 2, that is, the ventilation device 1
The lower end of 0 is covered by a body cover 5 having a suitable vent 4. On the other hand, the first exhaust pipe 12 according to the present invention is attached to the upper end of the ventilator 10, that is, the upper end of the main body casing 11, and the discharge end of the exhaust pipe 12 is
Exhaust duct 6 communicating with the exhaust pipe provided on the roof of the house
Is facing inside.

A lower end of the main casing 11 is opened to form an air inlet 13, and a forced ventilation air passage 14 according to the present invention is concentrically disposed inside the air inlet 13. This forced ventilation airway 1
4 is formed in a blower casing 15, and a blower 16 is attached to the blower casing 15. The forced-ventilation airway 14 functions as a forced-ventilation airway by operating the blower 16, and as a result, functions as a natural ventilation airway when the blower 16 is not operated. The lower end of the blower casing 15 is configured as a flange, and is attached to the main body casing 11 using the flange. The space formed between the main body casing 11 and the forced ventilation air passage 14 functions as a natural ventilation air passage 17 that forms a bypass for the forced ventilation air passage 14. Therefore, a ventilation port 18 is formed in the flange portion of the blower casing 15.

Normally, the indoor air is warm,
Ventilation duct 17 and forced ventilation duct 14 without driving
Indoor air is exhausted to the outside through the air (natural ventilation)
However, when the temperature of the indoor air is lower than the outside air temperature due to cooling or the like, the natural ventilation becomes insufficient. Is forcibly discharged outside (forced ventilation).

A second exhaust pipe 19 having a taper is attached to the discharge end of the blower casing 15, and its discharge end face and the discharge end opening face 11t of the main body casing 11 are provided.
That is, it is disposed so that the lower end opening surface of the exhaust pipe 12 substantially matches. FIG. 1 shows first and second exhaust pipes 1.
Although tapered ones are shown as 2 and 19, this is not a requirement, and in some cases, may be a cylindrical shape without taper. However, if it is formed as a tapered one, the dimensional tolerance is large and convenient during assembly.

In the ventilating apparatus 10 described above, at least the first exhaust pipe 12 and the second exhaust pipe 19 each have a circular cross section, and the former discharge end opening area A1
The characteristic of the first embodiment is that the value of the ratio A2 / A1 of the discharge end opening area A2 to the latter is selected to be approximately 0.25 to 0.8. Assuming a circular cross section, this corresponds to a value of the ratio D2 / D1 of the diameter D2 of the exhaust pipe 17 to the diameter D1 of the exhaust pipe 12 being approximately 0.5 to 0.9. I do. The opening diameter D3 of the discharge end of the main casing 11 will be described later.

In the ventilation device 10 shown in FIG. 1, when the blower 16 is operated to perform forced ventilation, the room air passes through the ventilation opening 4 of the main body cover 5 and the inside of the main body casing 11.
Most of the air is discharged from the forced ventilation air duct 14 having the blower 16 to the duct 6 through the second exhaust pipe 19 and the first exhaust pipe 12, and the remaining inflow air passes through the natural ventilation air duct 17. The exhaust gas is discharged to the duct 6 through one exhaust pipe 12. The air that has flowed into the duct 6 is discharged outside. At this time, if the duct 6 is very long or has a sharp bend, the load on the blower 16 increases and the noise increases if the duct 6 does not have the natural ventilation wind path 17. However, by forming a bypass passage for the forced ventilation air passage 14 by the natural ventilation air passage 17, a part of the outflow wind from the forced ventilation air passage 14 does not go to the duct 6 but to the natural ventilation air passage 17. To form a “short-circuit path” that circulates between the ventilation air passages 14 and 17, thereby suppressing the load on the blower 16 and suppressing noise.

In this case, the discharge end opening area A of the exhaust pipe 12
Ratio of the discharge end opening area A2 of the exhaust pipe 17 to the ratio A2 /
Some explanation will be given as to why the value of A1 is selected to be approximately 0.25 to 0.8. This means that the lower limit of the ratio A2 / A1 is 0.25, which is 60% of the airflow (maximum airflow) when A2 / A1 = 1 as the minimum airflow even when taking into account the pipe resistance of the duct and the like. There is a demand for a degree, and according to the result of the experiment, the condition for satisfying the demand was almost A2 / A1 ≧ 0.25. In the area of A2 / A1 <0.25, forced ventilation airway 1
Since the fluid resistance of 4 itself was too large to obtain a desired forced ventilation air volume, it was not only practical but also increased in noise and not practical. In addition, the upper limit of the ratio A2 / A1. If this value exceeds 0.8, the fluid resistance of the naturally ventilated air passage 17 increases, the natural ventilation flow rate decreases too much, and the ventilation depends on forced ventilation. , This is also impractical. Incidentally, the combination of both forced ventilation and natural ventilation is originally based on the concept of energy saving and low cost, and it is not preferable to reduce the natural ventilation flow rate extremely. Thus, it is desirable to select the value of the flow ratio A2 / A1 in a range of approximately 0.25 to 0.8.

As described above, according to the ventilator 10 shown in FIG. 1, even if the pressure loss due to the piping of the duct 6 is large, it is possible to suppress the increase in noise and to ensure sufficient air volume performance. it can.

In the ventilation device 10 shown in FIG.
Is preferably set in the range of 0.5D2 to 0.9D3 with respect to the discharge port diameter D3 of the main body casing 11 and the discharge end opening diameter D2 of the exhaust pipe 19. According to this configuration, by considering the condition of D1 ≦ 0.9D3, the resistance of the reverse flow path inflow portion when forming the “short circuit” is directly considered, and the above-described effect can be ensured. .

(Embodiment 2) FIG. 2 shows a second embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and their description is omitted. The feature of this embodiment is that the discharge end face 19t of the second exhaust pipe 19 is
In the middle of the exhaust pipe 12 of FIG.
According to this configuration, the air exhausted from the forced ventilation air passage 14 through the exhaust pipe 19 is less likely to flow back to the naturally ventilated air passage 17, and the deterioration of the blower performance, that is, the reduction of the forced ventilation performance can be further reduced. it can. In addition, the second exhaust pipe 19
By inserting the discharge end face 19t at the end of the ventilator into the first exhaust pipe 12, the height of the ventilator can be reduced, and the cost can be reduced.

(Embodiment 3) FIG. 3 shows a third embodiment of the present invention. In this embodiment, the length of the exhaust pipe 19 is made longer than that of the exhaust pipe 12 so that the discharge end face 19t of the exhaust pipe 19 is
It is made to protrude from. According to this configuration, the backflow of the air discharged from the forced ventilation air passage 14 through the exhaust pipe 19 to the naturally ventilated air passage 17 is more unlikely to occur, and the deterioration of the blower performance, that is, the deterioration of the forced ventilation performance is further reduced. Can be reduced.

(Embodiment 4) FIG. 4 shows a fourth embodiment of the present invention. In this embodiment, the blower 26 is constituted by a sirocco fan, which is attached to the main body casing 11 in a horizontal arrangement perpendicular to the axis thereof. Blower 26 and second exhaust pipe 2
9 is configured as an integral part. The discharge end opening diameters D1, D2, and D3 are the same as those in the first embodiment described with reference to FIG. As a structural characteristic of the sirocco fan, the blower 26 has a rectangular discharge port at the blade portion. It has a square cross section, and the outlet side (discharge end side) has a circular cross section. Thus, the exhaust pipe 29 functions as a sectional shape conversion member.

The air which has flowed into the main body casing 11 from the air vent 4 of the main body cover 5 flows in the horizontal direction from the casing of the blower 26, that is, the air inlet 25a of the blower casing 25, and changes its direction upward at right angles to the second direction. Exhaust pipe 29
Head to the side.

According to this embodiment, since the sirocco fan is used and the exhaust pipe 29 is integrally formed with the blower 26, the air volume performance at the time of static pressure is high, and the air volume can be used in a higher air volume zone. And low noise. Further, the work of installation and assembly on site can be facilitated.
In addition, the sirocco fan emits noise due to an abnormally high rotation speed when the pressure loss of the duct increases, but by adopting this form, a part of the air discharged from the sirocco fan is short-circuited. Come back,
It is possible to prevent a situation where the rotation speed of the sirocco fan becomes abnormally high, thereby preventing occurrence of abnormal noise.

(Embodiment 5) FIG. 5 shows a fifth embodiment of the present invention. In this embodiment, the axial center of the exhaust pipe 29 is adjusted so that the ventilation cross section of the natural ventilation wind path 27 that bypasses the forced ventilation wind path 14 including the blower 26 is relatively large. This is greatly shifted from the axis.

According to this configuration, the ventilation device 20 has a small airflow resistance as a whole, and can favorably promote natural ventilation caused by a temperature difference between the inside and outside of the room even when the operation of the blower 26 is stopped.

(Embodiment 6) FIG. 6 shows a sixth embodiment of the present invention. This embodiment is based on the ventilator 20 shown in FIG. 5, and is characterized in that the axis of the exhaust pipe 12 and the axis of the upper surface opening 11h of the main casing 11 substantially coincide with each other. It is.

According to this configuration, positioning can be easily performed at the time of assembly and construction, and the workability can be improved.

(Embodiment 7) FIG. 7 shows a seventh embodiment of the present invention. This embodiment is based on the ventilator 20 shown in FIG. 5, and is characterized in that the discharge end opening shape of the exhaust pipe 12 is substantially square as shown in the figure.

According to this configuration, the shape of the opening of the exhaust pipe 12 becomes the same as the shape of the discharge port of the blower 26, so that the flow of the wind is smooth and the air volume performance can be further improved.

[0033]

According to the present invention, it is possible to provide a low-noise ventilator while ensuring a sufficient air flow even when the pressure loss due to duct piping is large.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a ventilation device according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a main part of a ventilation device according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a main part of a ventilation device according to a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a ventilation device according to a fourth embodiment of the present invention.

FIG. 5 is a vertical sectional view of a ventilation device according to a fifth embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a main part of a ventilation device according to a sixth embodiment of the present invention.

FIG. 7 is a plan view of a ventilation device according to a seventh embodiment of the present invention.

[Explanation of symbols]

 2 Ceiling board 3 Field edge 4 Vent 5 Main body cover 6 Duct 10 Ventilation device 11 Main body casing 12 First exhaust pipe 13 Intake port 14 Forced ventilation airway 15 Blower casing 16 Blower 17 Natural ventilation airway 18 Vent 19 Second Exhaust pipe 20 Ventilation device 25 Blower casing 26 Blower 29 Second exhaust pipe

Claims (8)

[Claims] A forced ventilation air passage having a blower is provided in a main body casing having a first exhaust pipe at a discharge end, and a discharge end of the forced ventilation air passage is connected to the main body via a second exhaust pipe. A ventilating device that is opened at a discharge end of a casing and forms a natural ventilation air passage that forms a bypass between the forced ventilation air passage and the main body casing between the forced ventilation air passage and the main body casing; The ratio of the discharge end opening area of the second exhaust pipe to the discharge end opening area is approximately 0.25 to 0.5.
8. A ventilating device, wherein the ventilation device is set to 8. 2. The ventilator according to claim 1, wherein each of the first exhaust pipe, the second exhaust pipe, and a discharge port of the main casing has a substantially circular cross section, and the second exhaust pipe has a substantially circular cross section. Ventilation characterized in that the discharge end opening diameter of the exhaust pipe ranges from 0.5 times the discharge end opening diameter of the first exhaust pipe to 0.9 times the discharge end opening diameter of the main casing. apparatus. 3. The ventilation device according to claim 1, wherein the forced ventilation air passage is formed as a structure independent of the main body casing, and the forced ventilation air passage is detachably mounted in the main body casing. A ventilator characterized by that: 4. The ventilator according to claim 1, wherein a discharge end of said first exhaust pipe projects into said second exhaust pipe. . 5. The ventilator according to claim 1, wherein said blower is a sirocco fan, and said blower is integrally formed with said forced ventilation air passage. 6. The ventilation device according to claim 3, wherein the forced ventilation air passage is eccentrically arranged in the main casing so as to form a bypass air passage for the ventilation air passage when viewed from the ventilation direction. Features ventilation equipment. 7. The ventilating apparatus according to claim 6, wherein an axis of the second exhaust pipe substantially coincides with an axis of an upper surface opening of the main casing. 8. A ventilating apparatus according to claim 1, wherein said second exhaust pipe has a substantially quadrangular discharge end opening.