JPH0313496B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat exchange type blower having an air blowing function and a heat exchange function.

Conventional structure and its problems Conventionally, in this type of heat exchange type blower, in order to separate two types of airflow, it was necessary to seal the gap between the fixed partition plate and the outer peripheral plate of the rotating blade. There is. The general sealing method is
Mechanical seals, lapirin seals, etc. can be considered. However, in either case, it is necessary to provide a sliding portion with extremely high precision or to make the gap portion extremely narrow. Therefore, there are problems such as an increase in the shaft torque required for rotation, a requirement for extremely high accuracy with respect to surface run-out and eccentricity of the blade itself, and making machining and assembly extremely difficult. Therefore, it cannot be called a practical sealing method, and it is extremely expensive. Furthermore, as an alternative to the above sealing method, a simple seal has conventionally been used. FIG. 1 shows the impeller portion of a heat exchange type blower. Reference numeral 1 denotes a blade made of a corrugated thin plate made of stainless steel, aluminum, plastic, etc., and the groove portion is positioned radially from the center of rotation. 2 is a main plate having a boss 3 for supporting the blade 1 from the rotation center side and fixing the impeller to the rotation shaft.

Reference numeral 4 denotes a substantially ring-shaped outer circumferential plate that supports the blade 1 along with the main plate 2 from the outer circumferential direction, and a substantially ring-shaped flexible sealing material 5 is attached to this outer circumferential plate 4. FIG. 2 shows a simple sealing system, in which 6 is a partition plate fixed to the outer circumferential direction of the impeller, the sealing material 5 is pressed against the partition plate 6 with a pressing allowance a, and two types of air with different temperatures are 7 and 8 flows are prevented from mixing. If we consider the case where the heat exchange type blower moves in the thrust direction of the rotating shaft from the state shown in Figure 3 during assembly or transportation of the product, the amount of movement will be b in one direction as shown in Figure 4. (>a)
Then, a gap c is created and the air 7, 8 in FIG.
The streams will mix and the heat exchange efficiency will be significantly reduced. Conversely, as shown in Figure 5, when the amount of movement is d, the pressing distance of the sealing material 5 is e(d+
As a), the rotating shaft torque becomes significantly large.

As mentioned above, in the conventional simple sealing method, by moving the heat exchange type blower in the thrust direction,
There are drawbacks such as a decrease in sealing effectiveness and an increase in rotating shaft torque, and it is necessary to increase the assembly accuracy in the thrust direction and to take measures against movement in the thrust direction during transportation. In addition, when the heat exchange type blower starts rotating, the sealing material 5 and the partition plate 6 are pressed by a pressing amount a.
Because of this, there was a problem when the starting torque became large.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a heat exchange type blower that is inexpensive and has a practically satisfactory sealing condition.

Composition of the Invention The heat exchange type blower of the present invention includes an impeller and a partition plate, the partition plate has a curvature part on the inner periphery to serve as a contact part, and the cross section is flat and the overall shape is approximately cylindrical. One end of a flexible sealing material is attached to the outer periphery of the impeller, and the other end of the sealing material is deformed by centrifugal force due to rotation of the impeller and slid into contact with the curvature of the contact portion of the partition plate. This separates the two types of airflow on both sides of the impeller.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

FIG. 6 shows the impeller portion of the heat exchange type blower, and 9 is a blade made of a corrugated thin plate of stainless steel, aluminum, plastic, etc., and the groove portion is located radially from the center of rotation. Reference numeral 10 denotes a main plate having a boss 11 for supporting the blade 9 from the center of the rotation axis and fixing the impeller to the rotation axis. Reference numeral 12 denotes a substantially ring-shaped outer circumferential plate that supports the blades 9 along with the main plate 10 from the outer circumferential direction, and the blades 9, the main plate 10, and the outer circumferential plate 12 form an impeller. Reference numeral 13 denotes a flexible sealing material having a flat plate-like cross section and a generally cylindrical overall shape, and one end thereof is attached to the outer circumferential portion of the impeller, that is, the outer circumferential plate 12. A plurality of cuts 13a are provided on the outer periphery of the sealing material 13 to increase its flexibility. The entire sealing material 13 may be flexible, but in the embodiment, the bending portion 13b is particularly flexible. Further, the sealing material 13 is made of an appropriate material such as felt, rubber, or resin.

FIG. 7 shows a clothes dryer incorporating the impeller described above, in which 14 is an outer frame of the dryer, 15 is a drum rotatably installed within the outer frame 14, and 16 is a drum 15.
17 is an impeller shown in FIG. 6, and 18 is a rotating shaft for rotating the impeller 17, to which the boss 11 of the main plate 10 is fixed. 19 is a casing that encloses the impeller 17 and forms a ventilation passage; 20 is a partition plate that partitions the air flow on both sides of the impeller 17 from the ventilation passage portion; The other end of the sealing material 13 that is not the end attached to the outer peripheral plate 12 is provided close to the inner peripheral part of the partition plate 20, and is deformed by the centrifugal force caused by the rotation of the impeller, so that the inner peripheral part of the partition plate 20 is contact and slide. A curved portion is provided on the inner peripheral portion of the partition plate 20 to serve as a contact portion 20a of the sealing material 13. 21 is a duct for guiding hot and humid drying circulating air, and a heater 22 is provided in the middle.
23 is a duct for exhausting the intake cooling air.

Reference numerals 24 and 25 indicate the flows of drying circulating air and cooling air, respectively. 26 is a drain port for discharging dehumidified water to the outside of the machine.

FIG. 8 shows the flow of two types of air 24 and 25 having different temperatures flowing on both sides of the impeller 17 in FIG. 7, and the specific structure of the impeller 17.
In this structure, 27 is a set screw for fixing the impeller to the rotating shaft 18, 28 is an inner comb-like protrusion that projects alternately on both sides of the main plate 10, and is integrally formed with the main plate 10. It has a function of preventing air flows on both sides of the blade 9 from mixing. Reference numeral 29 denotes an outer comb-teeth-like protrusion which has the same function as the inner comb-teeth-like protrusion 28 and supports the outer peripheral side of the blade 9 from the outside, and is integrally formed with the outer circumferential plate 12 .

The drying circulating air 24 and the cooling air 25 flow adjacent to each other on both sides of the blades 9 and exchange heat through the blades 9. Moreover, these two flows 24 and 25 do not mix due to the action of the inner and outer comb-like protrusions 28 and 29. In FIG. 9, the inner circumferential side of the sealing material 13 is fixed to the outer circumferential plate 12, and the outer circumferential side is positioned so as to be inclined to the contact portion 20a of the corresponding partition plate 20, and there is a gap between the sealing material 13 and the partition plate 20 when not rotating. W (position A).

In the above configuration, when the power is turned on and the motor (not shown) is rotated, and the impeller 17 is rotated by this rotational force, two different air flows are generated on both sides of the impeller 17, namely, drying circulating air 24 and cooling air. 25 flows occur. Circulating air for drying 24
enters the drum 15 after being heated by the heater 22, moves along one surface of the impeller 17 after heating the clothes in the drum 15, and heads toward the heater 22 again via the duct 21.

Cooling air 25 is sucked in from outside the aircraft and passes through the impeller 17.
and exits the aircraft again through the duct 23. Then, both air flows side by side through the grooves on both sides of the blade 9 with one thin plate in between, and at this time, the high temperature drying circulating air 24 is transferred to the low temperature cooling air 25 via the blade 9. moves, the drying circulating air 24 is cooled, and the water contained therein condenses into water droplets at the drain port 2.
6, and the drying circulating air 24 is dehumidified. The dehumidified drying circulation air 24 passes through a ventilation path composed of an impeller 17, a casing 19, and a partition plate 20, passes through a circulation duct 21, passes through a heater 22, is heated here, and returns to the drum 15. Do a cycle. On the other hand, cooling air 25 is sucked in from outside the machine, enters the impeller 17, cools the drying circulating air there, and is exhausted to the outside of the machine through the exhaust duct 23.

By the way, the gap between the rotating impeller 17 and the fixed partition plate 20 located in the direction of its outer circumference is kept to a minimum, and the air 2 on both sides of the impeller 17 is kept to a minimum.
The aim of the present invention is to prevent mixing of the sealing material 13 and the sealing material 13 due to the centrifugal force when the impeller 17 rotates, as shown in FIG.
tries to rise in the outer circumferential direction starting from the bent portion 13b, and the end side surface of the sealing material 13 is connected to the partition plate 20.
The outer circumferential plate 1
2 and the partition plate 20 are closed during rotation to prevent the air 24 and 25 from mixing. (B
position). At this time, since the end side surface of the sealing material 13 is in sliding contact with the curved portion of the partition plate 20, the sliding torque can be extremely small, and furthermore, the wear of the sealing material 13 can be reduced and high reliability can be obtained. As a result, the hot and humid drying circulating air 24 and the cooling air 25 are not mixed, and the temperature of the drying circulating air 24 can be prevented from decreasing, and the heat exchange efficiency of the heat exchange type blower can be improved. As a result, it is possible to improve the dehumidification ability.

Furthermore, if the heat exchange type blower moves in the thrust direction during product assembly or transportation, even if the amount of movement is y in one direction (y<x) as shown in Figure 10,
When the sealing material 13 is not rotating (A position), the partition plate 20
It has a contact part 20a and a gap w ₁ , and when rotating,
Due to centrifugal force, it rises from the bent portion 13b (position B) and slides into contact with the contact portion 20a. In addition, even if the amount of movement is z in the opposite direction (+ direction) of FIG. 10 as shown in FIG. 11, there is a gap w ₂ with the contact portion 20a when not rotating (A position), and the rotating At times, the sealing material 13 slides into contact with the contact portion 20a due to centrifugal force (position B). In other words, even if the heat exchange type blower moves in the thrust direction, when rotating,
The outer peripheral plate 12 and the partition plate 20 are closed, and the impeller 1
The torque when rotating No. 7 does not become extremely large.

In addition, when not rotating, the sealing material 13 and the partition plate 2
0 is a non-contact state, so the starting torque of the impeller 17 is significantly smaller than in the past. Also,
The gap between the partition plate 20 and the impeller 17 can be increased, processing, assembly, and adjustment are simplified, and productivity is extremely improved.

In addition, in the embodiment, the case where the present invention is applied as a heat exchange device for dehumidifying a clothes dryer was explained. The present invention can also be implemented as a heat exchange device for transferring heat.

Effects of the Invention As described above, according to the present invention, a curvature portion is provided on the inner peripheral portion of the partition plate to serve as a contact portion, and a flexible sealing material having a flat cross section and a generally cylindrical overall shape is provided. One end is attached to the outer periphery of the impeller, and the other end is deformed by the centrifugal force caused by the rotation of the impeller and slides into contact with the curvature of the contact part of the partition plate, allowing the mixing of different air on both sides of the impeller. A sufficient sealing effect can be obtained by keeping it to a minimum. and,
The means for this purpose is a simple one with a devised sealing material composition, which has low axial torque of the impeller during rotation, is highly reliable with excellent wear resistance, and is extremely advantageous in terms of construction and handling. be. Furthermore, since sealing is achieved by centrifugal force during rotation, it is possible to provide a heat exchange type blower in which the axial torque of the impeller during startup is extremely small.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing the impeller of a conventional heat exchange type blower, Fig. 2 is a sectional view of the impeller, Fig. 3 is an enlarged sectional view showing the seal structure of the impeller, Figs. The figure is an enlarged cross-sectional view showing the seal structure when the impeller moves in the thrust direction, Figure 6 is an external perspective view showing the impeller of a heat exchange type blower according to an embodiment of the present invention, and Figure 7 is the same blower. 8 is a sectional view of the impeller, FIG. 9 is an enlarged sectional view showing the seal structure of the impeller, FIGS. 10 and 11.
The figure is an enlarged sectional view showing the seal structure when the impeller moves in the thrust direction. 9... Blade, 12... Outer peripheral plate, 13... Seal material, 17... Impeller, 20... Partition plate, 2
0a...Contact part.

Claims (1)

[Claims] 1.Equipped with an impeller that blows air independently on both sides and also exchanges heat between the air flowing on both sides, and a partition plate that is fixed to the outer circumferential direction of this impeller and separates the air flow from the impeller. One end of a flexible sealing material having a flat plate-like cross section and a generally cylindrical overall shape is provided with a curvature part on the periphery to serve as a contact part, and is attached to the outer periphery of the impeller in purple. A heat exchange type blower in which an end side is deformed by centrifugal force caused by rotation of an impeller and slid into contact with a curvature portion of a contact portion of the partition plate.