JPS62155899A - Dryer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a dryer configured to cause air discharged from a drying chamber to flow into a heat exchanger 21 to exchange heat with outside air.

[Technical Background of the Invention] This type of dryer has a fan as its heat exchanger, for example, by forming blades on both sides of a main plate that is rotated, and the fan is activated by the air blowing action accompanying the rotation of the fan. Some use a blower type heat exchanger configured to exchange heat by circulating exhaust air from the drying chamber and outside air on both sides.

In this blower type heat exchanger, the casing is arranged at the rear of the outer box so that the back side is closed by the back plate of the outer box, and the main plate of the fan is installed inside the casing to prevent exhaust air from the drying room. It is rotatably arranged so as to be divided into an introduction chamber and an outside air introduction chamber. In order to seal between the exhaust gas introduction chamber and the outside air introduction chamber, the casing is provided with an annular portion that protrudes inward, and a bifurcated annular sealing member is placed around the outer circumference of the main plate, which is the outer peripheral end of the fan. The seal members were attached to the annular portion so as to protrude outward in the radial direction, and these seal members were configured to come into sliding contact with both sides of the annular portion.

However, with this configuration, two annular seal members are pasted together to form a bifurcated seal member, resulting in poor workability and the presence of bifurcated seal members on both sides of the annular portion after assembly. It is necessary to check whether the annular part is pinched by the seal member, which is troublesome, and there is also the concern that the sealing member is in constant contact, which increases the sliding resistance especially during startup. Was.

Therefore, recently, a sealing member is formed into a cylindrical shape using felt or the like, and one end of this sealing member is attached to the outer periphery of the main plate of the fan.When the fan rotates, centrifugal force causes the other end of the sealing member to It has been considered to seal between the exhaust gas introduction chamber and the outside air passenger room by expanding and deforming and slidingly contacting the inner circumferential surface of the annular portion.

[Problems in the background art] According to the above-mentioned seal configuration that utilizes centrifugal force, the sliding resistance at startup is reduced, a sufficient sealing effect can be expected during operation, and it can be easily installed. It will be done.

However, with this configuration, if the lint filter installed at the exhaust outlet of the drying chamber becomes clogged, for example, the inflow of air from the drying chamber (into the throat air introduction chamber) will be blocked, resulting in a negative pressure inside the exhaust introduction chamber. and as a result,
The air in the outside air introduction chamber on the high pressure side resists the centrifugal force acting on the seal member and deforms the other end of the seal member so as to narrow it, and the gap formed between the seal member and the annular portion is A problem occurred where the exhaust gas flowed into the exhaust introduction chamber.

When this happens, especially in the so-called circulation type, in which air is discharged from the drying chamber and exchanged heat with the outside air, it is returned back into the drying chamber. As the air is forced to flow, the pressure inside the drying chamber increases, and as a result, air leaks into the outer box from gaps in the drying chamber.
A problem arises in that lint from the clothing together with this leaked air flows into the outer box and adheres to electrical components such as the motor and timer.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances.The purpose of the present invention is to provide a sealing effect using centrifugal force, and even if the pressure in the exhaust introduction chamber is lower than that in the outside air introduction chamber, both inlet and To provide a dryer in which there is no possibility that the sealing performance between rooms will be impaired and there is no possibility that air in an outside air introduction room will flow into an exhaust introduction room.

[Summary of the Invention] The present invention forms an annular groove having a substantially U-shaped cross section with one end open and the depth direction aligned with the axial direction of the fan, in an annular portion provided inwardly protruding from a casing. , one end of the flexible seal small member is loosely inserted into the annular groove, and the other end is attached to the fan, which makes it easy to assemble the seal member and makes it easier to install when starting up. The Hf (contact resistance) of the seal member is reduced, which is a unique effect of the seal structure that utilizes centrifugal force. By deforming open and sliding against the inner peripheral surface of the larger diameter side of the annular groove, the space between the exhaust introduction chamber and the outside air introduction chamber is sealed, and the lint filter becomes clogged, causing the exhaust introduction chamber to become closer to the outside air introduction chamber. If the pressure becomes low and the sealing member is compressed and deformed by the pressure of the high-pressure side air in the outside air introduction chamber, the sealing member slides into contact with the inner peripheral surface of the small diameter side of the annular groove, thereby preventing both introductions. This is to create a seal between the rooms.

[Embodiment of the Invention] Hereinafter, an embodiment in which the present invention is applied to a so-called circulation type drum dryer will be described with reference to the drawings.

In FIG. 3, reference numeral 1 denotes an outer box, and a door 2 opens and closes an entrance 3 for dried materials on the front surface.

Reference numeral 4 denotes a support plate fixed to the front back side of the outer box 1, and a communication opening 5 communicating with the entrance/exit 3 is formed in the center part.

Reference numeral 6 denotes a drum serving as a drying chamber, the front side of which is rotatably fitted and supported on the outer periphery of the support plate 4, and the shaft 7 attached to the rear side supported by a horizontal frame 8 fixed to the rear of the outer box 1. It is rotatably supported via 9. Reference numeral 10 denotes a blower type heat exchanger, which is disposed at the rear of the outer box 1 so as to face the rear surface of the drum 6. The heat exchanger 10 includes a casing 11 and a fan 14 made of, for example, plastic and rotatably supported by the partition 7 so as to divide the inside of the casing 11 into an exhaust introduction chamber 12 and an outside air intake chamber 13. Consists of.

The fan 14 has a circular shape of 15 and 15, and this main, l
Jy, 15, and blades 16 formed radially by curving a predetermined annular region into a waveform along the circumferential direction. On the other hand, the caning 11 is formed in the shape of a dish-shaped container with an open back.
7 so that the back side thereof is closed.

In order to suck the exhaust gas from the drum 6 into the exhaust introduction chamber 12 and return it into the drum 6, a vent 20 is formed which communicates with the exhaust outlet 19 of the drum 6 equipped with a lint filter 18. An outlet (not shown) of 12 is connected through a duct 21 to an air port 22 of the drum 6 formed in the lower part of the support plate 4. Further, an inlet 23 and an outlet 24 are formed in the back plate 17 of the outer box 1 to suck in and discharge outside air into the outside air introduction chamber 13.

25 is a motor that rotationally drives the drum 6 and the fan 14;
26 is a heater disposed within the duct 21, 27 is a door switch, and 28 is a timer for operation control.

Here, in the blower type heat exchanger 10, a seal structure between the exhaust gas introduction chamber 12 and the outside air introduction chamber 13 will be explained with reference to FIG. That is, 29 is an annular partition plate serving as an annular portion, and is screwed to the casing 11 so as to protrude inward.

Two annular ribs 29a and 29b are integrally and concentrically protruded from the inner peripheral side of the rear surface of the annular partition plate 29, and one rear end is open between the two ribs 29a and 29b, and the depth is An annular groove 30 whose direction coincides with the axial direction of the fan 14 and whose cross section is substantially U-shaped is formed. A ring 31 made of, for example, a stainless steel plate with a small coefficient of friction and having a substantially U-shaped cross section is fitted into the annular groove 30.

It should be noted that the inner part of the small-diameter side circumferential surface part 31a of this ring 31 is curved into a larger arc shape than the small-diameter side circumferential surface part 31b. On the other hand, reference numeral 32 denotes a mounting part integrally formed on the outer peripheral part of the main plate 15, which is the outer peripheral end of the fan 14,
It is located opposite to the rear side of the annular groove 30 formed in the groove 9 . A seal mounting groove 33 is formed on the front side of this mounting portion 32, and an adhesive loading groove 34 with a shallower bottom than this mounting groove 33 is formed on the rear side, and a partition between these grooves 33 and 34 is formed. As shown in FIGS. 4 and 5, a large number of long holes 35 are formed intermittently in the wall 32a.

Reference numeral 36 denotes a flexible sealing member made of felt, for example, and this is formed into a short cylindrical shape that extends from one end on the annular portion 29 side to the other end and faces in the front-rear direction, which is the axial direction of the fan 14. There is.

This sealing member 36 has the other end side of the axially opposite sides fitted into the sealing groove (; I groove 33) of the mounting portion 32, and
It is attached to the outer periphery of the fan 14 by loading an adhesive 37 into the adhesive loading groove 34 . In this case, the seal member 36 is made concentric with the mounting portion 32 by the adhesive 37 entering the seal mounting groove 33 through the elongated hole 35;
Unlike the case where the seal member 36 is inserted into the seal mounting groove 33 by applying a bonding agent to one end of the seal member 36 without the elongated hole 35, the bonding agent protrudes from the seal mounting groove 33 and the seal member 36 is inserted into the seal mounting groove. There is no possibility that the seal member 36 will adhere to the portion protruding from the seal member 33 and damage the flexibility of the seal member 36. The front end side, which is one end side, of the seal member 36 attached in this way is inside the annular groove 30, and thus both inner circumferential surfaces 3 of the ring 31.
It is loosely inserted between 1a and 31b with a predetermined small gap.

Unlike the conventional bifurcated seal member 36, the seal member 36 only needs to be formed into a short cylindrical shape, so it is extremely easy to form. It is only necessary to loosely insert the fan 14, and as the fan 14 rotates as will be described later, the centrifugal force of the fan 14 causes the front end to deform as if expanding in diameter and automatically come into sliding contact with the ring 31. Unlike the conventional method, in which it was necessary to confirm whether or not there is sliding contact on both the front and rear sides, such confirmation work after assembly is not necessary, and the assembly can be easily performed.

Next, the operation of the above configuration will be explained. When the drying operation is started, the motor 25 and the heater 26 are energized. When the motor 25 starts due to this energization, the drum 6 and the fan 1
4 rotates, and the air inside the drum 6 is sucked into the exhaust introduction chamber 12 by the centrifugal blowing action caused by the rotation of the fan 14, and in the process of being returned to the drum 6 through the duct 21, it is hot-aired by the heater 26. , outside air is sucked into the outside air introduction chamber 13 through the suction port 23 and is discharged outward through the discharge port 24. The air that has been hot-aired by the heater 26 and supplied into the drum 6 removes moisture from the dried material, and is then sucked into the exhaust introduction chamber 12 again, where it is heated by the outside air by heat conduction via the fan 14. The air is cooled and dehumidified by exchanging heat with the air, and is then hot-aired again and supplied into the drum 6, thus circulating.

By the way, during the drying operation as described above, the gap between the fan 14 and the annular partition plate 29 is sealed, and the exhaust introduction chamber 1 is closed.
2 and the outside air introduction chamber 13 must be kept in a non-communicating state, and this sealing is achieved as follows. That is, when the fan 14 rotates due to activation of the motor 25, the sealing member 36 receives centrifugal force accompanying the rotation, and moves from the state shown by the solid line in FIG. The ring 3 deforms outward as if expanding in diameter.
1 (if the ring 31 is not provided, it slides against the rib 29a).

In this case, when the fan 14 starts rotating (when the motor 25 starts), the sealing member 36 is not in sliding contact with the inner circumferential surface of the ring 31 or is in a very light sliding contact state. Sliding resistance at startup is reduced. Then, as the rotation of the fan 14 increases, the sealing member 36
slides into contact with the large-diameter peripheral surface 31b of the ring 31, thereby sealing the gap between the fan 14 and the annular partition plate 29, and making the exhaust introduction chamber 12 and the outside air introduction chamber 13 non-communicating. , air circulation between the two chambers 12 and 13 is prevented.

Normally, the space between the two introduction chambers 12 and 13 is sealed as described above, but if the lint filter 18 provided at the exhaust outlet 19 becomes clogged, the exhaust air introduction chamber is sealed from the drum 6. Since the inflow of exhaust gas into the inside of the exhaust gas introduction chamber 12 becomes obstructed, the pressure inside the exhaust gas introduction chamber 12 gradually becomes lower than the pressure inside the outside air introduction chamber 13, and as a result, the pressure inside the outside air introduction chamber 13, which is on the high pressure side, The air inside the seal member 3
6 to overcome the centrifugal force acting on the second seal member 36.
Deform it so that it narrows as shown in the figure.

Then, the seal member 36, which had been in sliding contact with the large-diameter peripheral surface 31b of the ring 31, comes to come into sliding contact with the small-diameter peripheral surface 31a of the ring 31 (if the ring 31 is not present, it will slide against the rib 29b). ).

Therefore, even if the pressure in the exhaust introduction chamber 12 is lower than that in the outside air introduction chamber 13, the seal between the two introduction chambers 12 and 13 is maintained by the ring 3.
This is maintained by the sliding contact of the sealing member 36 with the small-diameter peripheral surface portion 31a of the exhaust gas introduction chamber 1, and there is no possibility that the outside air that has flowed into the outside air introduction chamber 13 will flow into the exhaust gas introduction chamber 12. Therefore, since the outside air is not sent into the drum 6 through the duct 21 by the blowing action of the fan 14, the pressure inside the drum 6 increases and the air inside the drum 6 is forced into the support plate 4 to support the fitting of the drum 6. There is no leakage into the outer box 1 from gaps between parts, etc., and lint does not adhere to electrical components such as the motor 25 or the timer 28 inside the outer box 1.

Note that the present invention is not limited to the embodiments described above and shown in the drawings; for example, the cross-sectional shape of the annular groove may be approximately U-shaped; It also includes a V-shape in which both the inner circumferential surfaces on the smaller diameter side are inclined. It may also be applied to so-called exhaust type dryers in which air is discharged from the drying chamber and heat exchanged with outside air using a heat exchanger, and is discharged outside the machine without returning to the drying chamber. The specific structure of the fan constituting the heat exchanger can be modified in various ways without departing from the spirit of the invention.

[Effects of the Invention] As explained in D below, the present invention has an annular groove that is open at one end and whose depth is aligned with the axial direction of the fan. , a sealing member is formed using a flexible material such that one end faces in the axial direction of the fan, the other end of the sealing member is fixed to the outer circumference of the fan, and the one end is loosely inserted into the annular groove. Because of this structure, the seal member can be easily installed, and the sliding resistance of the seal member during startup is reduced, which is the unique effect of a seal structure that utilizes centrifugal force. In some cases, the sealing member expands and deforms due to the centrifugal force caused by the rotation of the fan and slides into contact with the inner circumferential surface of the larger diameter side of the annular groove, thereby sealing between the exhaust gas introduction chamber and the outside air introduction chamber. If the pressure in the exhaust introduction chamber becomes lower than that in the outside air introduction chamber due to clogging, etc., and the sealing member is deformed so as to contract due to the pressure of the air in the outside air introduction chamber, the sealing member may become smaller in diameter of the annular groove. Since it comes into sliding contact with the side inner circumferential surface and seals between the two introduction chambers, the outside air flows into the exhaust introduction chamber for 1λ.
This has the excellent effect of not causing any damage.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical sectional side view of the main part, FIG. 2 is a longitudinal sectional side view of the same main part shown in a different state from that in FIG. 1, and FIG. FIG. 4 is a partial vertical side view showing the mounting structure of the sealing member, and FIG. 5 is a rear view of the upper part of the fan. In the figure, 6 is a drum (drying room), 10 is a blower type heat exchanger (
heat exchanger), 11 is a casing, 12 is an exhaust introduction chamber, 1
3 is an outside air introduction chamber, 14 is a fan, 18 is a lint filter, 29 is an annular partition plate (annular portion), 30 is an annular groove, and 36 is a sealing member.

Claims (1)

[Claims] 1. In a device in which air discharged from a drying chamber is caused to flow into a heat exchanger to exchange heat with outside air, the heat exchanger includes a casing, and an inside of the casing is connected to an exhaust introduction chamber and outside air is introduced. a fan which is arranged rotatably to be divided into two chambers and which performs heat exchange between the two introduction chambers; and a fan which is provided in the casing so as to protrude inward and has one end open and the axis of the fan in the depth direction. an annular portion formed with an annular groove having a substantially U-shaped cross section aligned in the same direction; and an annular portion formed in a cylindrical shape with one end facing in the axial direction of the fan, the other end being attached to the outer peripheral portion of the fan, and the one end side and a flexible seal member which is loosely inserted into the annular groove of the annular portion and whose one end side is expanded and deformed by the centrifugal force accompanying the rotation of the fan and slides into contact with the inner circumferential surface of the annular groove. Dryer.