JPH03188920A - Dehumidifier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Fields 2 and 7 The present invention is applicable to built-in steam generation equipment such as rice cookers,
The present invention relates to a device for dehumidifying the generated steam.

BACKGROUND ART As shown in FIG. 6, a heat exchange double-blade fan 1 conventionally used in this type of device has dehumidifying blades 2 and submerged blades 3 (not shown) radially extending from the center. The configuration was set up in An example of the overall configuration and implementation of this device will be explained based on FIGS. 6 and 7.

In FIG. 6, a heat exchange type double-blade fan 1 has dehumidifying side blades 2 and cooling side blades 3 on both sides. The double-blade fan 1 and the partition plate 4 partition the casing into a dehumidifying side casing 6 and a cooling side casing 6. Note that 7 in the figure is a drive device such as a motor, which drives the double-blade fan 1 to rotate.

The dehumidifying side casing 6 has a separator 8 so that moist air can easily circulate within the dehumidifying side casing 6,
2. The double-blade fan 1 has an intake hole 9 near the center of the dehumidifying side blade 2 for sucking in humid air and circulation flow guided by the intake pipe 13, and the dehumidifying side casing 5
An exhaust hole 10, which also serves as a drain, is provided on the outer periphery of the tank.

Further, the cooling side casing 6 is provided with an intake hole 11 for sucking in cold outside air and an exhaust hole 12 for exhausting the sucked outside air. 14 is a dehumidifying device constructed from these.

FIG. 7 shows an embodiment in which the dehumidifying device 14 and a device for discharging steam are built in and installed.

In this figure, 16 is a device that discharges steam, such as a rice cooker, and 16 is a steam discharge port.

The steam exiting from the exhaust port 16 is guided to the dehumidifier 14 through the above-mentioned intake pipe 13. 1A is an exhaust pipe that guides moisture and dehumidified air to the outside of the built case 18, and 19 is an exhaust pipe that leads the air out of the built case 18 from the exhaust hole 12 of the cooling side casing 6.

The configuration is as shown below, and its operation will be explained next with reference to FIG.

By operating the double-blade fan 1), first, outside air is sucked into the cooling side casing 6 from the intake hole 11, passes through the cooling side blade 3, and is discharged from the exhaust hole 12, as shown by arrow a. This creates a cooling air flow.

On the other hand, in the dehumidification side casing 5, there is a circulation flow of existing air (arrow b) in the circulation path formed by the separator 8.
However, at this time, a negative pressure is generated in the center of the dehumidifying blade 2, and a suction force is generated in the air intake hole 9 provided in the vicinity thereof, resulting in an air intake flow (arrow C).

Therefore, when installed as shown in FIGS. 6 and 7, the steam exiting from the exhaust port 16 of the device 16 that discharges steam passes through the intake pipe 13 and is sucked into the dehumidifying side casing 5 along the path of arrow C. Circulating flow inside the dehumidifying side casing 6 (arrow b
) to join. Here, as mentioned above, the cooling side of the double-blade fan 1 is cooled by the outside air, and this circulating flow (arrow b)
Heat is exchanged with this double-blade fan 1, the steam is condensed, and is discharged as moisture along with some dehumidified air from the exhaust hole 1o.
-g Exit (arrow d).

As described above, the heat exchange performance of the double-blade fan 1 is a major factor that influences the dehumidification performance.

Problems to be Solved by the Invention Therefore, the first problem is that in the double-blade fan 1 of the prior art described above, that is, in the blades simply arranged radially as shown in FIG.
It becomes a state where it is pressed. Therefore, the opposite rotation direction 4
b becomes a negative pressure, and almost no air comes into contact with the portion 4b on the opposite side in the rotational direction. Therefore, the heat transfer area of the double-blade fan is not used effectively.

The second problem is that the entire airflow becomes a stable laminar flow state, and a boundary layer is formed on the blade side surface in the rotation direction 4a and the surface of the fan board 5, that is, the heat transfer surface. This results in a decrease in heat transfer coefficient.

Therefore, the present invention provides a dehumidifying device that improves each of the first and second problems in -1-. , Means for solving the problems [In order to solve the first and second problems described in 11.
The means for this is to provide a slit in at least one part of the blades arranged radially outward from the medium heat of one double-winged fan (A4 configuration).

Furthermore, as a second means, first blades are provided in which the outer diameter of the blades is arranged radially outward from the center of both wing fans and is smaller than the fan diameter, and an extension wire of this first blade is provided. I that a second blade is provided approximately radially outside and from near the outside diameter of this blade toward the outside diameter of the fan.
It was completed in '411.

Function: In the first means, a portion of the air is allowed to flow out through the slit provided in the plate, thereby eliminating the negative pressure generated on the opposite side of the blade side in the direction of rotation.

In the second method, since the second blade is outside the first blade extension line I, the air flow coming out of the first blade is a flow of air that collides with the second blade. Become. Therefore, an effect occurs that disturbs the boundary layer on the rotational direction side of the side surface of the second blade, and an effect also occurs that disturbs the boundary layer formed on the surface of the fan board.

Embodiment Regarding the first means, an embodiment will be explained based on FIGS. 1 and 2.

1 and 2 are a perspective view and a plan view of a heat exchange type double-blade fan 2o showing an embodiment of the present invention.

Dehumidification side blades 21 and cooling side blades 22 are arranged radially on both sides of the double-blade fan 20, and slits 23 are provided in each of the blades 21 and 22 on both sides. (Illustration of the cooling side is omitted) Note that 24 indicates the blade side surface rotation direction side of the dehumidification side blade 21, and 26 indicates the blade side surface rotation direction opposite side.

As in the conventional example described above, the rotating operation of the double-winged fan 20 causes air to be taken in from the center of the double-winged fan 2o, causing a flow action toward the outer periphery. That is, the flow of air taken in from the center of the double-wing fan 20 is 1. M2... are each B4. B2... and C4 flowing out from the slit 23. It is divided into the flow of C2... If there is no slit 23, the air flow between the blades is pressed against the side 24 of the blade in the rotational direction, and the side 26 of the blade side opposite to the rotational direction is in a negative pressure state, as in the conventional example described above. However, by providing the above-mentioned slits, flows of C, C2, etc. are generated as described above, and the negative pressure section on the opposite side 26 of the rotational direction of the blade side surface is filled with air, as in the conventional example described above. Air also comes into contact with the blade side surface 26 on the opposite side in the direction of rotation, where there was almost no air contact. Therefore, the entire heat transfer area of both wings 77 and 2o can be used for heat exchange.

Further, an example of the development of the first means is shown in FIG. This is a configuration in which, in the above embodiment, a radial blade 27 is newly provided, for example, from a position covering the slit 23 of the dehumidifying blade 21 provided with the slit 23 toward the outer periphery. As for the air flow, 9-pair air flow is taken in from the center of both wing fans 26, and D2... are each F4. R2・
...Fl.

It is diverted to F2... Furthermore, airflow F1. F2・
... is from slit 23 to G1. G2...
G1. of the outflow occurs, producing the same effect as in the first embodiment, and since the newly installed blade 27 is located close to the slit 23, the G1. G2...
..., the airflow E2. Since the flow of E3...'' is disturbed and the separation effect of the boundary layer is produced, the heat exchange effect is improved compared to the previous embodiment.

Next, the second means will be explained. FIG. 4 shows a double-blade fan 28 of the present invention according to the second means, and 29 is a first blade provided, for example, radially from the center of the double-blade fan 28, and an extension line of the first blade 29 is shown in FIG. The configuration is such that a second blade 3o is provided outside and from near the outer diameter of the first blade 29 toward the outer diameter of the double-blade fan 28.

In this configuration, air is taken in from the center of the double-wing fan 28 and flows toward the outer periphery of the double-wing fan 28 in the same manner as described above. That is, the air 10.\-flows H1, H2... are I, , I2... and I4. It is divided into I2 and I2. At this time, the flow rates of Jl and I2 are larger than the flow rate from the slit 23 in the first embodiment described above, and the flow rate of the branch I of the blade located one blade behind in the rotation direction is
2゜■,... collides with I,, I,...
・It exerts the effect of disturbing the flow and causes the separation effect of the boundary layer on the side surface portion of the fushide. Furthermore, a peeling effect is also produced in the boundary layer on the surface of the fan board 31, resulting in an improvement in the heat transfer coefficient.

Note that the slit 23 described in the embodiment of the present invention may be formed of a substantially round hole or a substantially elongated hole having a similar effect.

Further, the surfaces of the two blades 21 and 22 of the double-winged fan 200 and the fan board 31 may be formed with irregularities, such as embossing, to further enhance the separation effect of the boundary layer.

Effects of the Invention As described in the above embodiments, the first means of the present invention is as follows:
Compared to conventional double-blade fans, by providing a slit in a part of the blades, the airflow can also be filled in the rear part of the blade side 11, 7, and the heat transfer area of the double-blade fan can be used more effectively. Furthermore, by providing the first blade and the second blade as in the second means, a separation action of the boundary layer on the side surface of the second blade and the boundary layer on the surface of the fan board is caused to cause turbulent flow. In this way, it is possible to improve the heat transfer coefficient.

In this way, the effects of the first means and the second means can greatly improve the dehumidifying effect of humid air, making it an industrially useful means.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a heat exchange double-blade fan showing an embodiment of the first means of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a double-blade fan showing an expanded embodiment of the first means. Plan view of 4th
The figure is a plan view of a double-blade fan showing the second means, FIG. 6 is a plan view of a conventional double-blade fan, FIG. 6 is an overall schematic configuration diagram of the dehumidifier, and FIG. 7 is an implementation showing the state in which the dehumidifier is installed. It is a state schematic diagram. 6... Dehumidification side casing, 6... Cooling side casing, 9, 11... Intake hole, 10, 1
2...Exhaust hole, 20...Double wing fan, 21.
22...°°° blade, 23... slit,
27...Newly installed blade, 29...
・First blade, 30...Second blade.

Claims (2)

[Claims] (1) It is equipped with a heat exchange type double-blade fan driven by a drive device, and a partition plate that partitions the casing together with the double-blade fan into a dehumidifying side casing and a cooling side casing, each of which takes air into the dehumidifying side casing and the cooling side casing. The dehumidifying device includes a hole and an exhaust hole, and a slit in at least one of blades arranged radially outward from the center of the fan. (2) A first blade that is arranged radially outward from the center of the double-wing fan and has an outer diameter smaller than the fan diameter; 2. The dehumidifying device according to claim 1, wherein the second blades are provided radially from the vicinity of the diameter toward the outer diameter of the fan.