JPS5915737A - Heat exchange type blower - Google Patents

Abstract

PURPOSE:To prevent two kinds of fluid from mixing with each other by a simple constitution wherein a partition plate is provided in the outer peripheral direction of a blade outer periphery supporting plate and a fan is formed between the supporting plate and the partition plate in the heat exchange type blower having blades composed of corrugated thin plate. CONSTITUTION:The outer periphery supporting plate 12, a large number of parts indented with an angle of lag alpha in the direction of rotation of an impeller 1 of which form the fan 13, is provided on the outer peripheries of the blades 10 for support. The fan 13 generates the flow, the direction of which is contrary to the direction of the flow of the fluid flowing from high pressure side to low pressure side so as to impede the flow of said fluid, resulting in generating the effect to balance the pressures at high pressure side and low pressure side. Accordingly, two heat exchange fluids sucked in through respective suction ports are prevented from entering from one to the other. Consequently, the mixing of the heat exchange fluids can be prevented with employing no special sealing means.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a blade made of a corrugated thin plate, and has the function of blowing two different fluids on both sides of the plate, and at the same time generates heat between the fluids flowing on both sides through the blade surface. This relates to a heat exchange type blower that performs exchange, and its purpose is to minimize the mixing of two types of fluids flowing on both sides of the blower.

2. Description of the Related Art Conventionally known general methods of sealing an engaging portion between a rotating body and a stationary body include using a mechanical seal, a labyrinth seal, and the like.

However, in either case, a sliding part is provided or an extremely narrow gap is required, so there are problems such as the axial torque of the rotating body becoming large and the rotating body having to be rotated with extremely high precision. Therefore, it cannot be called a simple sealing method, and it is a factor in high manufacturing costs. For this reason, even in the heat exchange type blower according to the present invention, it is not preferable to use the sealing method as described above.
When trying to apply this to home appliances such as ventilation fans, the problem becomes even more serious.

The present invention takes the above-mentioned conventional problems into consideration and provides a heat exchange type blower having a simple sealing structure that does not require a high level of airtightness. Examples will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a heat exchange type blower according to the present invention, in which 1 is an impeller with blades made of corrugated thin plates, 2 is a rotating shaft for rotating the impeller 1, 3 is a shaft containing the impeller 1, and has a ventilation passage. 4 is a partition plate that partitions the flow of fluid, such as air, on both sides of the impeller 1 from the ventilation passage portion. 5.6 is the air flow suction port on both sides of the impeller 10, 7.
8 is a discharge port, and the arrows indicate the direction of air flow on both sides of the impeller 1.
The figure shows the external shape of an impeller 1 used in a blower.
1 is a main plate that supports a blade 10 made of a corrugated thin plate from the rotation axis side and has a boss 11 for fixing the impeller 1 to the rotation axis 2. Reference numeral 12 denotes an outer circumferential plate that supports the outer circumferential side of the blade 1o and has a fan 13 formed on the outer circumferential portion by an uneven portion having a delay angle a with respect to the rotational direction of the impeller 1.

That is, as shown in FIG. 3, when the impeller 1 is rotated in the direction of the solid line arrow, air tends to flow in the direction of the broken line arrow.

In the above configuration, when the rotating shaft 2 is operated and the impeller 1 is rotated, two different air flows are generated on both sides of the impeller 1, and the air sucked separately from each of the suction ports 6.6 has a wave shape. The flow flows through grooves on both sides of the blade 10 made of thin plates, adjacent to each other with one thin plate in between. At this time, if there is a temperature difference between the air flows on both sides of the impeller 1, heat exchange is performed through the surfaces of the blades 10, and the air after heat exchange is composed of the impeller 1, the casing 3, and the partition plate 4. It is guided to the discharge lower 8 through the ventilation path.

However, since there is a gap between the rotating impeller 1 and the fixed partition plate 4, the airflow on both sides of the impeller 1 is as follows.
When it is discharged from the impeller 1 into the ventilation passage, it mixes slightly when it reaches 5 lbs. Therefore, the seal structure according to the present invention attempts to minimize this mixing of air flows.

Most air leaks at the separation between the impeller 1 and the partition plate 4 occur from one side to the other due to the pressure difference that occurs on both sides of the impeller 1, so air tends to flow from the high pressure side to the low pressure side. .

However, in this embodiment, the fan 1 is mounted on the outer peripheral plate 12.
3, the fan 13 is configured as shown in FIG.
This effect generates a flow in the opposite direction that should prevent fluid from flowing from the high pressure side to the low pressure side, thereby maintaining the set pressure balance. Therefore, air leakage from one of the two fluids to the other can be prevented. Note that an appropriate delay angle a may be selected depending on the magnitude of the pressure difference generated on both sides of the impeller.

FIGS. 4 and 5 show another embodiment in which the outer circumferential plate 12 has an uneven portion in the radial direction, and the fan 13'
and a surface 4a of the partition plate 4 facing the fan 13'.
has an inclination angle σ' with respect to the axial direction. The impeller is constructed so that the valley of the slope on the surface 4a is located on the side where the six-beam pressure generated on both surfaces of the impeller is higher.

According to the above configuration, the fluid flowing out from the fan 13' in the centrifugal direction collides with the surface 4a of the partition plate 4 and tends to flow along the inclined surface of the angle a'. The flow of the fluid is caused by a pressure difference generated on both sides of the impeller 1, which generates a flow in the opposite direction to prevent the fluid from flowing from the high pressure side to the low pressure side, thereby maintaining the pressure balance. Therefore, it is possible to prevent air leakage between the two fluids. can.

As described above, according to the present invention, a heat exchange type blower having sufficient airtightness can be obtained by simply providing a fan that maintains pressure balance between the outer circumferential plate, which is the outer circumference of the impeller, and the partition plate. It does not require high processing precision like conventional airtight seal structures and can be driven with low rotational torque, making it possible to manufacture heat exchange type blowers at low cost and greatly increasing productivity. can.

[Brief explanation of drawings]

Figure 1 shows a heat exchange type air blower 71\ in an embodiment of the present invention.
・A schematic cross-sectional view of the machine; Figure 2 is a perspective view of the impeller;
FIG. 3 is a diagram for explaining the action of a fan provided on the outer circumferential side of the impeller, FIG. 4 is an enlarged sectional view showing a fan structure in another embodiment, and FIG. 5 is a perspective view of the main part of the impeller. 4... Partition plate, 12... Outer peripheral plate, 13
．． 13'...Fan. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 7 β Figure 2 Figure 4 Figure 5 0

Claims (3)

[Claims] (1) A blade consisting of a corrugated thin plate arranged radially from the central axis of rotation, an outer circumferential plate supporting the outer circumferential portion of the blade, and two blades disposed in the outer circumferential direction of the outer circumferential plate and flowing on both sides of the blade. A heat exchange type blower comprising a partition plate that separates two different fluids, and a fan configured between the outer circumferential plate and the partition plate to maintain a pressure balance between the two fluids. (2) The heat exchange type blower according to claim 1, wherein the fan is formed of an uneven portion located in the radial direction of the outer circumferential plate and having a delay angle with respect to the rotation direction. (3) Claim 1, wherein the fan is formed by an uneven portion located in the radial direction of the outer peripheral plate, and the surface of the partition plate facing the uneven portion has an inclination angle with respect to the axial direction. Heat exchange type blower.