JPH06257968A - Heat exchanging type ventilating fan - Google Patents

Abstract

PURPOSE:To make a labyrinth unit unnecessary and permit the increase of heat exchanging area by a method wherein a partitioning plate, partitioning a drying air casing and a cooling air casing from each other, is provided with a circumferential wall surface, opposed to the cylindrical outer periphery of both blade fans through an air gap. CONSTITUTION:When both blade fans 33 are rotated in a clothing drier, drying air, becoming highly humid by drying clothings, is circulated to the side of a drying air casing 11. The drying air becomes low temperature by heat exchange between both blade fans 33, cooled by cooling air in a cooling air casing 14, and produces condensate on the wall surface of the air casing 11. Most of the condensate is dispersed by the centrifugal force due to the rotation of both blade fans 33 and is discharged to the outside of the machine. In this case, a partitioning plate 36, partitioning respective air casings 11, 14, is provided with a circumferential wall surface 37, opposed to the outer periphery of both blade fans 33 and whose diameter is reduced toward the side of the cooling air casing 14, whereby the leakage of the condensate to the side of the cooling air casing 14 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange type blower having both a blower function and a heat exchange function used in clothes dryers, dehumidifying devices and the like.

[0002]

2. Description of the Related Art A conventional heat exchange type blower will be described with reference to FIGS. FIG. 4 shows a case where the heat exchange type blower is used for a clothes dryer, in which 1 is a main body of the dryer and 2 is a rotary drum rotatably provided in the main body 1.
It is driven by the motor 3 via the drum belt 4. 5 is a door for loading clothes provided on the front surface of the main body 1, and 6 is a heater for heating the drying air flowing into the rotary drum 2.

Reference numeral 7 denotes a double-blade fan provided at the rear portion of the rotary drum 2, which has two functions of air blowing and heat exchange. The rotation of the motor 3 is controlled by a fan motor pulley 8, a fan belt 9 and a fan pulley 10. Driven by receiving through. 1
Reference numeral 1 denotes a drying air casing for the double-blade fan 7, which is provided on the rear surface of the rotary drum 2 and has a rotary drum side intake hole 12 in the center. Reference numeral 13 denotes a filter provided on the rear surface of the rotary drum 2 for removing thread waste and the like. Reference numeral 14 is a cooling air casing, and like the drying air casing 11, it has an intake hole 15 in the center. Reference numeral 16 is a backing plate which forms a part of the cooling air casing 14, and has a casing exhaust hole 17 for exhausting the cooling air. A shaft 18 rotatably supports the double-blade fan 7 and the rotary drum 2, and is fixed to a holding plate 19 that fixes the drying air casing 14 to the main body 1. Reference numeral 20 denotes a partition portion interposed between the drying air casing 11 and the cooling air casing 14, and the outer peripheral portion of the double-blade fan 7 is divided into left and right portions so as to airtightly separate the drying side and the cooling side. As described above, the double-bladed fan 7, the drying air casing 11, and the cooling air casing 14 form a heat exchange type blower.

Reference numeral 21 denotes a circulation duct, which has a function of an air passage for guiding the exhaust air of the drying air casing 11 to the heater 6. Reference numeral 22 denotes a drain hole provided in the middle of the circulation duct 21 for discharging condensed water generated by heat exchange in the double-blade fan 7. Reference numeral 23 denotes a back plate which covers the rear surface of the main body 1, and includes an intake hole 24 for intake of cooling air, an exhaust hole 25 for exhausting the cooling air after heat exchange, and a cooling air after the heat exchange. A part thereof has an exhaust hole 26 for exhausting what has once passed through the main body 1. Reference numeral 27 is a seal member that forms an intake / exhaust path for cooling air between the backing plate 16 and the back plate.

Next, the detailed structure of the partitioning section 20 will be described with reference to FIG. Although shown in a simplified manner in FIG. 4, the partition plate 28 forming the partition portion 20 has a plurality of concentric circular ribs 29 on its inner peripheral portion. Further, the double-blade fan 7 is composed of a blade 30 made of a wavy thin plate whose groove portion is radially provided from the center of rotation toward the cylindrical outer peripheral portion. A plurality of concentric ribs 31 are also provided on the outer peripheral portion of the blade 30. In this way, the two ribs 29 and 31 are in a non-contact manner and alternately mesh with each other to form the labyrinth portion 32. The arrow A indicates the drying air and the arrow B indicates the cooling air.

With the above construction, the heat exchange type blower operates so as to dry the clothes contained in the rotary drum 2. That is, when the motor 3 starts rotating, the rotary drum 2 containing the clothes and the both-wing fan 7 also start rotating. As a result, a flow of the drying air A and the cooling air B is generated. The drying air is heated by the heater 6 and enters the rotary drum 2 to dry the clothes. The drying air, which has become hot and humid due to the clothes being dried, circulates in the drying air path and returns to the both-wing fan 7. The function of the cooling air that is heat-exchanged with the drying air is fulfilled by the outside air taken in through the intake holes 24 provided in the back plate 23. The flow of the cooling air B enters the both-wing fan 7 from the intake hole 15 and is exhausted to the outside from the casing exhaust hole 17 of the cooling air casing 14 through the exhaust hole 24 provided in the back plate 23. Has become. A part of the cooling air B circulates in the main body 1 and is exhausted from an exhaust hole 26 also provided in the back plate 23.
The cooling air that has entered the double-blade fan 7 through the intake holes 15 comes into contact with the drying air via the blade 30 that is a wavy thin plate. As a result, the drying air is dehumidified by heat exchange with the cooling air to become a low temperature. The low-temperature, low-humidity drying air is heated again by the heater 6 to become high-temperature drying air, which dries the clothes in the rotary drum 2. Drying of clothes proceeds as described above.

Here, the function of the labyrinth portion 32 will be described. When the double-blade fan 7 is rotating, dehumidified water generated as a result of heat exchange from the drying air is generated on the drying air casing 11 side. Most of the dehumidified water is scattered by the centrifugal force generated by the rotation of the double-bladed fan 7, moves along the inner surface of the drying air casing 11, and is discharged out of the machine through the drain hole 22. However, a part thereof enters the labyrinth portion 32 and drifts in the direction of the wind flow generated along the rotation direction of the double-blade fan 7. At this time, the labyrinth portion 32 prevents the dehumidified water from leaking to the cooling air casing 14 side.

[0008]

SUMMARY OF THE INVENTION In the above conventional configuration,
When the diameter of the blade 30 is increased in order to increase the heat exchange area in order to improve the heat exchange performance, the labyrinth portion 32 is provided on the outer periphery of the blade 30, and the heat exchange blower itself is increased in size.

SUMMARY OF THE INVENTION The present invention is intended to solve the problems of the above-mentioned conventional structure, and an object thereof is to provide a heat exchange type blower having the same size and improved heat exchange performance.

[0010]

[Means for Solving the Problems] A first means of the present invention for achieving the above object is a double-blade fan provided with a cylindrical outer peripheral portion on the outer circumference of a blade, and a drying air on one side of the double-blade fan. A casing, a cooling air casing on the other side, and a partition plate for partitioning these casings, the partition plate is provided with circumferential wall surfaces opposed to each other through a gap on the outer periphery of the cylindrical outer peripheral portion of the blade fan, The circumferential wall surface is a heat exchange type blower configured such that its inner diameter expands from the cooling air casing side toward the drying air casing side.

A second means of the present invention is a double-blade fan having a cylindrical outer peripheral portion on the outer circumference of the blade, a drying air casing on one side of the double-blade fan, and a cooling air casing on the other side. A partition plate for partitioning these casings is provided, and the partition plate is provided with circumferential wall surfaces facing each other with a gap on the outer circumference of the cylindrical outer peripheral portion of the blade fan, and at least the wall surface below the circumferential wall surface is cooled. The heat exchange type blower has a structure in which the air casing side is above the drying air casing side.

[0012]

According to the first means of the present invention, the inner diameter of the circumferential wall surface formed on the partition plate is widened from the cooling air casing side toward the drying air casing side. The dew condensation water of the drying air adhering to the wall surface is guided to the drying air casing side therebelow, and acts so as to prevent the dew condensation water from leaking to the cooling air casing.

The second means of the present invention is that the cooling air casing side of at least the lower wall surface of the circumferential wall surface formed on the partition plate is located above the drying air casing side. The condensed water of the drying air adhering to the circumferential wall surface is guided to the drying air casing side and acts to prevent the condensed water from leaking to the cooling air casing side.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a heat exchange type blower which is the first means of the present invention will be described below with reference to FIG. Reference numeral 33 denotes a double-blade fan, which is provided with a blade 34 made of a corrugated thin plate whose groove portion is radially provided from the center of rotation toward the outer periphery. A cylindrical outer peripheral portion 35 is provided on the outer periphery of the blade 34. Reference numerals 11 and 14 denote a drying air casing and a cooling air casing, and a partition plate 36 is provided at the substantially central portion of these two casings. That is, the partition plate 36 divides the space between the double-blade fan 33 and the drying air casing 11 / cooling air casing 14 that covers the upper portions of the double-blade fan 33 into two parts, that is, the dry air introducing portion and the cooling air. It is divided into the introduction section. Partition plate 3
A circumferential wall surface 37 is provided on the upper surface of the cylindrical outer peripheral portion 35 forming the double-bladed fan 33 and a space provided therebetween. The inner diameter of the circumferential wall surface 37 increases from the cooling air casing 14 side toward the drying air casing 11 side. With this configuration, the labyrinth portion used in the conventional heat exchange type blower is not provided.

The operation when the heat exchange type blower of this embodiment is used as a clothes dryer will be described below. When the double-blade fan 33 starts rotating, the drying air casing 11
On the side, the drying air that has become humid due to the clothes being dried circulates. The drying air is heat-exchanged by the double-blade fan 33 to become a low temperature, and as a result, supersaturated water is condensed on the surface of the wall surface of the drying air casing 11. Most of the condensed water is scattered by the centrifugal force due to the rotation of the double-blade fan 33, moves along the inner surface of the drying air casing 11, and is discharged to the outside of the machine through the drain holes as described in the conventional example. .

However, a part of the condensed water is contained in the blade 34.
Into the space between the cylindrical outer peripheral portion 35 formed on the outer periphery of the cylindrical outer peripheral portion 35 and the circumferential wall surface 37 disposed on the outer periphery of the cylindrical outer peripheral portion 35, and the surface of the circumferential wall surface 37 is inserted into the double-blade fan 33.
It drifts in the direction of the wind flow that occurs along the direction of rotation. In this case, the circumferential wall surface 37 has a shape in which the inner diameter increases from the cooling air casing 14 side toward the drying air casing 11 side. Therefore, the circumferential wall 3
The water adhering to 7 easily falls to the cooling air casing 14 side in the upper part shown in FIG. The lower portion of the cylindrical wall surface 7 has a shape inclined toward the drying air casing 11 side.
Therefore, the attached dew condensation water drops along the slope to the drying air casing 11 side. Further, the condensed water that has dropped onto the drying air casing 11 then moves along the inner surface of the drying air casing 11 and is discharged to the outside of the machine through the drain holes as in the conventional configuration.

As described above, according to the present embodiment, even if the labyrinth portion is eliminated, due to the configuration of the circumferential wall surface 37 provided on the partition plate 36, the situation that dew condensation water leaks to the cooling air casing 14 occurs. There is no such thing. Therefore, in this embodiment, since the labyrinth portion 32 is not used, the blade 3
The diameter of 4 can be increased. That is, it is possible to increase the heat exchange area while keeping the same size without increasing the size of the heat exchange type blower. In addition, if the diameter of the blade 33 can be increased, the two-bladed fan 33
It is possible to reduce the number of rotations of the device and to reduce the noise of the device. That is, according to this embodiment, the effect of two birds with one stone can be obtained.

Next, the heat exchanger of the second means of the present invention will be described with reference to FIG. The main configuration is the same as in FIG. 1, and only the differences will be described. The lower portion 38a of the circumferential wall surface 38 of the partition plate 36 is inclined from the cooling air casing 14 side to the drying air casing 11 side, and this inclination becomes gentler toward the upper portion and becomes the uppermost portion. Is horizontal. That is, the lower portion 38a of the cylindrical wall surface 38 provided on the partition plate 36 makes the cooling air casing side above the drying air casing side.

The operation of this embodiment will be described below. Most of the dehumidified water generated in the drying air due to the heat exchange between the drying air and the cooling air by the rotation of the two-blade fan 33 is scattered by the centrifugal force due to the rotation of the two-blade fan 33. And moves along the inner surface of the drying air casing 11 and is discharged out of the machine through the drain holes. At this time, a part of the dehumidified water enters the space between the cylindrical outer peripheral portion 35 formed on the outer periphery of the blade 34 and the circumferential wall surface 38 provided on the upper portion of the cylindrical outer peripheral portion 35. The dehumidified water adheres to the surface of the circumferential wall surface 38 and drifts in the direction of the wind flow generated along the rotation direction of the double-blade fan 33. The lower portion 38a of the circumferential wall surface 38 of the present embodiment has an inclination that decreases toward the drying air casing 11 side. For this reason, the dehumidified water adhering to the circumferential wall surface 38 moves at a lower speed as it moves to the lower portion, and falls to the drying air casing 11 side. The dehumidified water that has dropped onto the drying air casing 11 moves along the inner surface of the drying air casing 11 as in the conventional configuration,
It is discharged out of the machine through the drainage hole.

As described above, according to this embodiment, even if the labyrinth portion is eliminated, the dehumidified water does not leak to the cooling air casing 14 side. Therefore, as in the above-described embodiment, the diameter of the blade 34 can be increased, that is, the heat exchange area can be increased without increasing the size of the heat exchange type blower while maintaining the same size. Further, if the diameter of the blade 33 can be increased, the rotation speed of the double-blade fan 33 can be reduced and the noise of the device can be reduced if the same air volume is set. In particular, according to this embodiment, since the upper portion of the cylindrical wall surface 38 is horizontal, the cooling air casing 14 for dehumidified water is different from the previous embodiment.
It is possible to more reliably prevent the fall to the side.

Further, a second embodiment of the second means of the present invention will be described with reference to FIG. In the present embodiment, the circumferential wall surface 40 is inclined toward the drying air casing 11 side with the cooling air casing 14 side facing up, that is, the entire upper wall portion 40a and the lower wall portion 40b. Other configurations are the same as those in FIG.

With the above construction, the dehumidified water adhering to the surface of the circumferential wall surface 40 can be more reliably treated with the drying air casing 11.
It acts to move it to the side. That is, according to the present embodiment, the upper portion 40a also has an inclination with the drying air casing 11 side down, so that the dehumidified water easily drops to the drying air casing 11 side.

[0023]

According to the first means of the present invention, a partition wall for partitioning the drying air casing and the cooling air casing is provided with a circumferential wall surface opposed to the outer circumference of the cylindrical outer circumference of the double-blade fan with a gap. This labyrinthine wall has an inner diameter that increases from the cooling air casing side to the drying air casing side, so that the labyrinth part is not required and the heat exchange area remains the same. It is possible to obtain a heat exchange type blower capable of increasing the size and reducing the noise.

A second means of the present invention is that a partition plate for partitioning the drying air casing and the cooling air casing is provided with circumferential wall surfaces facing each other with a gap on the outer circumference of the cylindrical outer circumference of the double-blade fan. At least the lower part of the circumferential wall surface is configured such that the cooling air casing side is higher than the drying air casing side, so that the dehumidified water is more reliably transferred to the cooling air casing side than by the first means. The heat exchange type blower can prevent the falling of

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat exchange type blower that is an embodiment of the first means of the present invention.

FIG. 2 is a sectional view of a heat exchange type blower that is an embodiment of the second means.

FIG. 3 is a sectional view of a heat exchange type blower which is a second embodiment of the second means.

FIG. 4 is a cross-sectional view of a clothes dryer that uses a conventional heat exchange blower.

FIG. 5 is a cross-sectional view of a conventional heat exchange type blower.

[Explanation of symbols]

 11 Drying Air Casing 14 Cooling Air Casing 33 Double-Wing Fan 34 Blade 35 Cylindrical Perimeter 36 Partition Plate 37, 38, 40 Circular Wall

Claims (2)

[Claims] 1. A double-blade fan having a cylindrical outer peripheral portion on the outer circumference of a blade, a drying air casing on one side of the double-blade fan, a cooling air casing on the other side, and a partition plate for partitioning these casings. The partition plate is provided with circumferential wall surfaces facing each other with a gap on the outer circumference of the cylindrical outer circumferential portion of the double-blade fan, and the inner diameter of the circumferential wall surface is from the cooling air casing side to the drying air casing side. A heat exchange type blower with a structure that expands toward. 2. A double-blade fan having a cylindrical outer peripheral portion on the outer circumference of a blade, a drying air casing on one side of the double-blade fan, a cooling air casing on the other side, and a partition plate for partitioning these casings. The partition plate is provided with circumferential wall surfaces facing each other with a gap on the outer circumference of the cylindrical outer circumferential portion of the double-blade fan, and at least the wall surface below the circumferential wall surface is a cooling air casing side for drying air casing. Heat exchange type blower configured to be above the side.