JPS637288B2 - - 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, the gap between a fixed partition member and the outer peripheral plate of the rotating blade was sealed. There is a need. Typical sealing methods include mechanical seals and labyrinth seals. 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 the torque required for rotation becomes large, extremely high precision is required for the surface runout and eccentricity of the blade itself, and machining and assembly become extremely difficult. Therefore, it cannot be called a practical sealing method, and it is extremely expensive.

Furthermore, as an alternative to the sealing method described above, the inventors have proposed a simple seal, although this is not publicly known. Figure 1 shows the impeller part of a heat exchange type blower. 1 is a blade made of corrugated thin plate made of stainless steel, aluminum, plastic, etc.
Groove portions are provided radially from the center of rotation.
2 is an internal member that supports the blade 1 from the rotation center side, and a boss 3 for fixing the blade 1 to the rotation shaft.
has.

Reference numeral 4 denotes a substantially ring-shaped outer circumferential member that supports the blade 1 along with the inner member 2 from the outer circumferential direction, and a substantially ring-shaped flexible seal member 5 is attached to this outer circumferential member 4. In Figure 2, 6 is blade 1
It is a partition member fixed in the outer circumferential direction. The sealing member 5 is pressed against the partitioning member 6 with a pressing amount a to prevent two types of air flows 7 and 8 having different temperatures from mixing through the gap between the outer peripheral member 4 and the partitioning member 6.

Now, if we consider the case where the impeller 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 b (> a) in one direction as shown in Figure 4. In this case, a gap c is generated and the air flows 7 and 8 shown in FIG. 2 are mixed, and the heat exchange efficiency is significantly reduced. On the other hand, when the movement amount is d in the + direction as shown in FIG. 5, the pressing distance of the seal member 5 becomes e(d+a), and the rotational torque becomes significantly large.

As described above, simple seals have problems such as a decrease in sealing effectiveness and an increase in rotational torque due to the movement of the impeller in the thrust direction.Therefore, it is necessary to improve the assembly accuracy in the thrust direction and to take measures against movement in the thrust direction during transportation. It was necessary to take some measures.
Further, when starting the rotation of the heat exchange type blower, a pressing allowance a is required between the sealing material 5 and the partition plate 6, which causes a problem in that the starting torque becomes large.

Purpose of the invention The present invention solves the above problems.
By considering the structure of the sealing material, a heat exchange type blower is provided that achieves a practically satisfactory sealing condition.

Composition of the Invention The heat exchange type blower of the present invention has a blade made of a corrugated thin plate constituting an impeller, in which the groove portion is provided radially from the center of rotation, and the blade is arranged in the outer circumferential direction of the blade and flows through the groove portion on both sides of the blade. a partition member that separates two types of airflow; a substantially ring-shaped seal member having a substantially V-shaped cross section when mounted is mounted on the outer periphery of the blade; and the partition member is provided in an open portion of the seal member. This structure prevents mixing of air flows, reduces rotational torque at startup, and also sufficiently absorbs movement of the impeller. It has been made possible.

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

FIG. 6 shows an impeller portion of a heat exchange type blower, and 9 is a blade made of a corrugated thin plate made of stainless steel, aluminum, plastic, etc., and has grooves radially extending from the center of rotation. 10
is an internal member that supports the blade 9 from the center side of the rotating shaft, and a boss 11 for fixing the impeller to the rotating shaft.
has.

Reference numeral 12 denotes a substantially ring-shaped outer circumferential member that supports the blade 9 together with the inner member 10 from the outer circumferential direction. A substantially ring-shaped and flexible sealing member 13 is attached to the outer peripheral member 12. This seal member 13 has a substantially V-shaped cross section when attached to the outer peripheral member 12. The entire sealing member 13 may be flexible. In the embodiment, especially the corner portion 13b
(See Figure 9) has flexibility. The sealing member 13 is made of felt, rubber, resin, or other appropriate material.

FIG. 7 shows a schematic cross-sectional structure of a clothes dryer incorporating the above-mentioned impeller, where 14 is a dryer outer frame, 1
5 is a drum rotatably installed within the dryer outer frame 14; 16 is a front door for introducing the material to be dried into the drum 15; 17 is an impeller shown in FIG. 6;
18 is a rotating shaft for rotating the impeller 17, and the boss 11 of the internal member 10 is fixed thereto. 19 is a casing that encloses the impeller 17 and forms a ventilation passage; 2;
Reference numeral 0 denotes a partition member that partitions the air flow on both sides of the impeller 17 by a ventilation passage portion, and is located in the outer circumferential direction of the outer peripheral member 12, and has a contact portion 20a wound around the inner edge thereof located in the open portion of the seal member 13. . 21 is a duct for guiding hot and humid drying circulating air,
A heater 22 is provided in the middle. 23 is a duct for exhausting the intake cooling air. 2
4 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 two types of air flows 24 and 25 having different temperatures flowing on both sides of the impeller 17 in FIG.
and a cross section of the impeller 17 to show the specific structure, 27 is a set screw fixing the impeller 17 to the rotating shaft 18, 28 is an inner comb-like projection that protrudes alternately on both sides of the inner member 10, It is formed integrally with the material 10 and has the function of preventing air flows on both sides of the blade 9 made of a corrugated thin plate from mixing. Reference numeral 29 denotes an outer comb-teeth-like protrusion that 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 peripheral member 12 .

FIG. 9 shows a specific mounting structure of the seal member 13. The inner circumferential side of the sealing member 13, which is flexible and has a substantially V-shaped cross-section, is fixed to the outer circumferential plate 12 at the corner portion 13b, and the inner edge of the partition member 20 is fixed to the open portion of the substantially V-shaped cross-section. is located, and when not rotating, the partition member 20 and the seal member 13 are in a nearly non-contact state.

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, heats the clothes in the drum 15, moves along one surface of the impeller 17, passes through the duct 21, and heads toward the heater 22 again. Cooling air 25 is sucked in from outside the machine, moves along the other surface of the impeller 17, and exits the machine through the duct 23 again. Both air flows side by side with a thin plate sandwiched between them in the grooves on both sides of the blade 9, and at this time, the drying circulating air 24, which has a high temperature, flows into the cooling air 25, which has a low temperature, through the blade 9. The heat is transferred, the circulating air 24 is cooled, and the moisture contained therein is condensed into water droplets and drained from the drain port 26, and the drying circulating air 24 is dehumidified. The dehumidified drying circulating air 24 passes through the impeller 17 and the casing 19.
and the partition member 20,
The air passes through the duct 21, passes through the heater 22, is heated there, and returns to the drum 15, performing a circulation.
On the other hand, cooling air 25 is sucked in from outside the machine, enters the impeller 17, cools the drying circulating air 24, and is exhausted to the outside of the machine through the exhaust duct 23.

As shown in FIGS. 8 and 9, when the impeller 17 rotates, the centrifugal force causes the seal member 13 to
tries to rise in the outer circumferential direction starting from the corner portion 13b, is pressed against the contact portion 20a of the partition member 20 and slides into contact, and the outer circumferential member 12 and the partition member 20 are closed during rotation, and the air 24, 25
can prevent mixing from both sides (from position A to position B).

During the rotation, by sliding the sealing member 13 into contact with the partitioning member 20 from both sides, the leakage path becomes longer than when it is on one side, and the mixing of the hot and humid drying circulating air 24 and the cooling air 25 is minimized. , it is possible to prevent a decrease in the temperature of the drying circulating air 24 and increase the heat exchange efficiency of the heat exchange type blower, and as a result,
It is possible to improve the dehumidification ability.

In addition, if the impeller moves in the thrust direction of the rotating shaft 18 during product assembly or transportation, the 10th
As shown in the figure, even if the amount of movement x is in the + direction, the seal member 13 does not strongly contact the contact portion 20a of the partition member 20 when not rotating, but when rotating, it rises from the corner portion 13b due to centrifugal force. Contact part 2
It is pressed against 0a and slides into contact.

Further, as shown in FIG. 11, even if the amount of movement is y in the opposite direction (one direction) to that in FIG. 10, when the seal member 13 on the opposite side to the surface in FIG. It comes into contact with and slides on the portion 20a. That is, even if the impeller moves in the thrust direction, the outer peripheral member 12 and the partition member 20 are closed by the seal member 13 due to centrifugal force during rotation, and the torque during rotation of the impeller 17 does not become extremely large. Further, when the impeller 17 is not rotating, the seal member 13 and the partition member 20 are almost in a non-contact state, so the starting torque of the impeller 17 is significantly smaller than that in the conventional case. Furthermore, the gap between the partition member 20 and the impeller 17 can be made large, making processing, assembly, and adjustment easy, and productivity is extremely improved. In addition, in the example, a case was explained in which a heat exchange type blower was applied as a heat exchange device for dehumidifying a clothes dryer. It can also be implemented as a heat exchange device for transferring heat to

Effects of the Invention As is clear from the above embodiments, in the heat exchange type blower of the present invention, the sealing member has a substantially V-shaped cross section, so that the partition member is sealed from both sides during rotation. Mixing of different airflows on both sides of the impeller can be kept to a minimum, improving heat exchange efficiency, and since the sealing member is in a state of almost non-contact with the partitioning member when not rotating, it is possible to reduce the rotational torque of the impeller during startup. It is something that can be achieved. Furthermore, the structure of the sealing member has an excellent effect in that the movement of the impeller in the thrust direction can be sufficiently absorbed.

[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 sectional view showing the seal structure when the impeller moves in the thrust direction, FIG. 6 is an external perspective view showing the impeller of a heat exchange type blower according to an embodiment of the present invention, and FIG. 7 is the same. A schematic side sectional view of a clothes dryer incorporating a blower,
Fig. 8 is a sectional view of the same impeller, Fig. 9 is an enlarged sectional view showing the seal structure of the impeller, Fig. 10,
FIG. 11 is an enlarged sectional view showing the seal structure when the impeller moves in the thrust direction. 9...Blade, 12...Outer peripheral member, 13...
Seal member, 17... Impeller, 20... Partition member.

Claims (1)

[Claims] 1. A blade consisting of a corrugated thin plate constituting an impeller with grooves radially extending from the center of rotation, and a partition member arranged in the outer circumferential direction of the blade to separate two types of airflow flowing through the grooves on both sides of the blade. A heat exchange type blower comprising: a substantially ring-shaped sealing member mounted on the outer periphery of the blade, the sealing member having a substantially V-shaped cross section when mounted, and an inner edge of the partitioning member being located in the open part of the sealing member; .