JPS59119127A - Heat exchange type blower - Google Patents

Abstract

PURPOSE:To reduce wear of a V-shaped seal member and a load torque by providing a shaft support of an impeller movably. CONSTITUTION:A clearance 10 is provided on a shaft 11 for retaining a bearing 17 of an impeller 3 in the direction of thrust of the bearing 17 so that the whole of the impeller 3 can move in the direction of air on the high temperature side from the state at which a partition plate 6 is positioned on the widthwise center line of a U-shaped groove 4, namely, a seal member 5. When the temperature difference is noticeable between air on the high temperature side and on the low temperature side, a difference is caused in thermal expansion levels between the surface and the back of the impeller 3 so that the impeller 3 is deflected in the direction in which the periphery of the impeller 3 sticks out to air on the low temperature side to increase a drag working on air on the high temperature side of a V-shaped seal member 5 from the partition plate 6. Thus, the whole of the impeller 3 moves in the direction of reducing the resisting force thereby balancing said forces working on air on the both sides of the V-shaped seal member 5 creating equilibrium at which the impeller 3 rotates with the warpage of the impeller 3 being absorbed.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a heat exchange type blower that simultaneously blows high-temperature side air and low-temperature side air with a single impeller, and exchanges heat between the two airs. It is.

Conventional Structure and Problems In this type of heat exchange type blower, as shown in FIG. 4, and a substantially ■-shaped sealing member 5 is attached to the U-shaped groove 4, and the partition plate 6 is connected to the U-shaped groove 4.
The impeller 3 is held on the holding shaft 1 so as to be located on the center line in the width direction of the groove 4, and the play in the thrust direction is set to 0.3~
The inventors have proposed a device with a thickness of 0.4 mm. The impeller 3 is composed of wave-shaped blades made of thin plates (made of resin) arranged radially from the center. When the impeller 3 is at rest, the rounded edges 6 of the sealing member 5 and the partition plate 6 ' are in a non-contact state, and when centrifugal force and wind force are applied to the seal member 6 due to the rotation of the impeller 3, the seal member 5 lightly contacts the partition plate 6, and the flexibility of the seal member 5 causes the impeller 3 to start. This is intended to reduce the torque during operation and to prevent the sealing effect from deteriorating due to surface runout of the impeller 3. However, in this configuration, when the impeller 3 is made of resin, if the impeller 3 is used under conditions where the temperature difference between the high temperature side air and the low temperature side air is 40°C or more, the surface that comes into contact with the high temperature side air will come into contact with the low temperature side air. Warpage occurs in the impeller 3 due to the difference in the amount of thermal expansion between the surfaces, and the amount of displacement at the outer periphery of the impeller 3 becomes significant.As shown in FIG. This accelerates the progress of wear on the impeller 3, and the large outer diameter of the impeller 3 also causes problems.
As a result, a problem arose in that the load torque increased, causing trouble in each drive system.

OBJECT OF THE INVENTION The present invention solves the above-mentioned problems, and provides a heat exchange type blower that reduces wear of the approximately square-shaped seal member, reduces load torque, and stabilizes the load torque.

Structure of the Invention In the heat exchange type blower of the present invention, the partition plate is positioned on the center line in the width direction of the sealing member, and the shaft support of the impeller is provided so as to be movable in the direction of the high temperature side air. If the impeller warps so that the outer periphery of the impeller protrudes toward the low-temperature side air due to the difference in thermal expansion between the front and back surfaces of the impeller due to the temperature difference with the low-temperature side air, the partition plate will be shaped like a The entire impeller moves along the axis to a stable position where the drag force exerted on both air sides of the seal member is uniformly applied to both sides, reducing wear on the approximately ■-shaped seal member and stabilizing the nine-load torque. It's something I did.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 3 to 5, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals.

11 is a holding shaft that holds the bearing part 17 of the impeller 3;
A gap 10 is provided in the thrust direction of the bearing portion 1γ so that the entire impeller 3 can move from a state where the partition plate 6 is located on the widthwise center line of the groove 4, that is, the seal member 5, to the high temperature side air direction.

The operation in the above configuration will be explained. First, when the heat exchange type blower is started, the drag forces acting from the partition plate 6 to the high-temperature air side and the low-temperature air side of the figure-7 seal member 6 are balanced, resulting in an equilibrium state as shown in Figure 3. Impeller 3 rotates. When there is a significant temperature difference between the high-temperature side air and the low-temperature side air, there will be a difference in the amount of thermal expansion between the front and back surfaces of the impeller 3. This causes the impeller 3 to move in a direction in which the outer circumference of the impeller 3 protrudes toward the low-temperature air side. Warpage occurs and drag increases from the partition plate 6 to the high temperature air side of the figure 7-shaped seal member 5, so the impeller 3 as a whole moves in the direction to reduce this drag and closes the figure 7 seal. When the drag forces acting on both air sides of the member 5 are balanced, the warpage of the impeller 3 is absorbed and the impeller 3 rotates in the state shown in FIG. 4.

In addition, due to the warpage of the impeller 3, the seal member 5 in the shape of a 7 is tilted and contacts the edge 6' of the inner circumference of the partition plate 6. Because of this, the contact between the partition plate 6 and the 7-shaped sealing member 5 is almost the same regardless of the rotational position of the V-shaped groove 4, as shown in FIG. Therefore, even if the impeller 3 warps, the entire impeller 3 moves toward the high temperature side air so that the contact state between the partition plate 6 and the figure 7-shaped seal member 5 before thermal deformation is restored. This has the effect of maintaining the drag force on the figure-shaped seal member 6 in its initial state, reducing the wear of the figure-7-shaped seal member 5 due to thermal deformation of the impeller 3, and maintaining the load torque in its initial state. No undue burden is placed on the drive system.

In addition, in the above embodiment, the case where the shaft support is configured so that the impeller 3 rotates around the fixed holding shaft 11 was shown, but as shown in FIG. For the case where the rotating shaft 21 is held by a fixed bearing 27 and the impeller 3 is rotated via a pulley 28, a configuration may be adopted in which the shaft is supported with a gap in the thrust direction as shown in the figure. It is sufficient that the impeller 3 is mounted so that the partition plate 6 is positioned on the center line in the width direction of the sealing member 5 having a figure 7 shape, and that the entire impeller 3 can be moved in the direction of the high-temperature side air along the central axis of rotation.

Effects of the Invention As is clear from the above embodiments, the heat exchange type blower of the present invention has a movable shaft portion of the impeller, so that when the impeller is thermally deformed and warped, the deformation causes The entire impeller moves in the thrust direction in order to reduce the drag from the working partition plate to the high-temperature air side of the V-shaped seal member and return to a stable state where the drag acting on both air sides of the seal member is balanced. By maintaining the initial contact state between the partition plate and the V-shaped seal member, it is possible to prevent the progress of wear of the seal member and to stabilize the load torque.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional heat exchange type blower, Fig. 2 is an enlarged sectional view of the same essential part showing the sealing state during thermal deformation of the impeller, and Fig. 3 is a heat exchanger showing an embodiment of the present invention. Figure 4 is an enlarged cross-sectional view of the main part of the type blower, and Figure 5 is an enlarged cross-sectional view of the same main part when the impeller undergoes thermal deformation and moves in the thrust direction.
The figure is an enlarged cross-sectional view of the same essential parts showing the sealed state when the impeller is deformed, and FIG. 6 is a cross-sectional view of a heat exchange type blower showing another embodiment. 3.Meeting... Impeller, 4-...@U-shaped groove, 5.
·vinegar. 7-shaped sealing member, 6... Partition plate, 1o.
...Gap in the thrust direction provided in the bearing part, 1
1... Holding shaft, 17... Bearing part, 21
... Rotating shaft, 27 ... Fixed bearing. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 6' Figure 2 Figure 3 Figure 5 Figure 6

Claims (1)

[Claims] It has blades made of corrugated thin plates arranged radially from the center and a sealing member in the shape of a square located on the outer periphery, which simultaneously blows high-temperature side air and low-temperature side air, and blows both air through the blade surface. An impeller that performs heat exchange between air and a casing having a partition plate to prevent mixing of the two airs, the partition plate being located on the center line in the width direction of the sealing member, and the shaft support of the impeller being arranged. A heat exchange type blower that can be moved towards the high temperature side air.