JPH03212293A - Dryer - Google Patents

Abstract

PURPOSE:To reduce the percent defective by setting the ratio of axial and radial gaps between first and second annular grooves in a specific range. CONSTITUTION:Denoting that the axial gap between rotary grooves 79 and stationary grooves 80 is A, and radial gap therebetween is B, the gap B is set to a value less than 2mm. Since the most of cases have an error of 2mm, if the gap A is set to a value less than 2mm, the tip ends of the rotary grooves 79 make contact with the inner surfaces of the stationary grooves 80. If the gap is set to 4mm, 70% of molded double surface fans becomes satisfactory. Accordingly, the ratio A/B is preferably greater than 2. Meanwhile, the larger the sectional area of the clearance in the labyrinth coupling, the lower the sealing efficiency becomes. Up to A/B=5, the dehumidifying function is stabilized in a saturated condition, but the dehumidifying function is lowered if the ratio A/B becomes higher than 5. That is, the ratio A/B is preferably less than 5. Thus, by setting the ratio A/B to a value greater than 2, the percent defective can be reduced, and by setting the same to a value less than 5, the dehumidifying function can be satisfactorily ensured.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a dryer.

(b) Conventional technology Conventionally, a heat exchange type double-sided fan is used to circulate drying air into the drying chamber, while introducing external air as cooling air, and the drying air and cooling air are heated by the fan. A so-called dehumidifying clothes dryer that removes moisture by replacing the clothes and then reheats the drying air with a heater and supplies it to the drying chamber is disclosed in Japanese Patent Publication No. 60-56518. A structure for preventing drying air from leaking into the cooling chamber has been proposed by the applicant in Japanese Patent Application No. 189108/1983. This will be explained based on FIGS. 5 to 7.

51 is a machine frame of a clothes dryer 52, 53 is a front plate fixed to the front side of this machine frame 51, and a clothes input port 54 is provided in the center. Reference numeral 55 denotes a rear plate fixed to the rear surface of the machine frame 51, and has an external air introduction hole 56 in the center and an outlet port 57 in the lower part. 58 is a door that opens and closes the input port 54; 59 is an annular sheet metal drum support plate attached in the machine frame 51 so as to surround the input port 54; 60 is a rear part of the machine frame 51;
A support plate 61 is installed in the transverse direction so as to be spaced apart from the rear plate 55, and is a fan casing fixed to the support plate 60, so that the inside of the machine frame 51 is connected to the drying chamber 6.
2 and a fan chamber 63. Reference numeral 64 denotes a horizontal shaft type drum disposed within the drying chamber 62, with its front opening facing the input port 54, and the drum support plate 59
The rear side is rotatably supported on a shaft 65 via felt or the like. 66. is a drying air outlet provided at the center of the rear surface of the drum 64, 67 is a lint filter that covers this outlet 66-, 68 is a drying air inlet provided at the lower part of the drum support plate 39, 69
is provided in the support plate 60 and communicates the drying chamber 62 and the fan chamber 63, and 70 is the drying air outlet 66.
This is a sealing member for reliably sending the air from ... to the communication port 69.

Reference numeral 71 denotes a disk-shaped double-sided fan made of synthetic resin fixed to the shaft 65 in the fan chamber 63, and includes a circulation fan 72 located on the drying chamber 62 side and a circulation fan 72 located on the rear plate 55 side. Cooling fans 73 . . . are formed integrally with each other in a radial manner, and a pulley 74 is integrally formed in the central portion on the cooling fan side. 75 is a synthetic resin partition plate provided in the fan casing 61 so as to surround the double-sided fan 71;
By accommodating the double-sided fan 71 in the circular opening at the center, the partition plate 75 and the double-sided fan 71 work together to divide the inside of the fan chamber 63 into a drying air passage 77 and a cooling air passage 78. It is divided.

Now, at the periphery of the double-sided fan 71, the drying air passage 7
A concentric rotating groove group 79 that opens toward the cooling air passage 78 is integrally formed therein, while a concentric fixing groove group 80 that opens toward the cooling air passage 78 is integrally formed on the inner peripheral edge of the partition plate 75. The rotary groove group 79 is loosely fitted into the fixed groove group 80 without contacting each other. That is, the rotating groove group 79 and the fixed groove group 80 form a labyrinth connection. Reference numeral 81 denotes a water drain hole through which dehumidified water that has condensed and fallen within the labyrinth joint is led out to the drying air path side.

Although not shown, a screw boss is provided on the back side of the fixing groove group 80 and is screwed onto the wall of the opposing drying air passage, so there is a possibility that the partition plate 75 may warp due to heat or the like. is extremely small.

82 is the lower part of the drying air passage 77 and the drying air inlet 68.
It is a drying duct that connects the..., and a heating heater 83 is disposed inside. Reference numeral 84 is a discharge port provided at the bottom of the duct 82 to discharge the dehumidified water condensed in the duct to the outside of the machine. Reference numeral 85 is a drive motor, which connects the pulley 74 via a small pulley 86 and a belt 87. It is also connected to the drum 64 via a pulley and a belt (not shown).

Therefore, during drying, the driving force of the drive motor 85
The drum 64 is rotated at a low speed and the double-sided fan 71 is rotated at a high speed in one direction, and at the same time, the heater 83 is energized to heat the drying air.

As a result, the wind generated by the rotation of the circulation fans 72 is transferred to the drying air passage 77, the drying duct 82, the drum 6
4 and exchanges heat with the material to be dried in the drum 64. Further, due to the rotation of the cooling fan 73...
Outside air is introduced into the cooling air passage 78 from the introduction holes 56 and is led out from the outlet 57, at which time the double-sided fan 71 is cooled. After heat exchange, the drying air is cooled by contacting the double-sided fan 71, and moisture in the drying air is condensed, flows down the drying air path 77, and is discharged from the outlet 84. During this time, the drying air passage 77 and the cooling air passage 7
8 is sealed by the labyrinth connection.

(c) Problems to be Solved by the Invention In general, as a feature of resin molded products, when annular groove groups are integrally formed on a partition plate or double-sided fan, the radial dimension can be molded with high accuracy, but the axial dimension is less accurate (for example,
The dimensional accuracy in the radial direction is ±1 mm or less, while the dimensional accuracy in the axial direction is ±3 mm).

Therefore, when the fixed groove group and the rotating groove group are loosely fitted with an interval of several f or more, as in the conventional example, defective products may occur due to dimensional errors in the axial direction during molding and assembly. There are problems that have a high probability of occurring.

The present invention relates to an improvement of a dryer and is intended to solve these problems.

(d) Means for solving the problem The present invention circulates drying air to the drying chamber using a heat exchange type double-sided fan made of synthetic resin material, and
The dryer introduces external air as cooling air, and removes moisture by exchanging heat between the drying air and the cooling air using the fan, the dryer working with the double-sided fan to partition a drying air path and a cooling air path. In order to achieve this, a partition plate made of synthetic resin is arranged around the fan and has an opening in the center for arranging the fan, and along the periphery of the opening of this partition plate, the drying air path side and the cooling air are connected to each other. a first annular groove group integrally molded concentrically on one roadside surface; and a first annular groove group integrally molded concentrically along the outer periphery of the fan and loosely fitted into the first annular groove group in a non-contact state. a second annular groove group, and the ratio (A/B) of the axial gap A to the radial gap B in the first annular groove group and the second annular groove group is about 2 to 5. This is set within the range.

Further, in the dryer of the present invention, at least one of the first annular groove group and the second annular groove group has an integrated tongue piece that is worn out by a short period of friction with the inner surface of the other annular groove group. It was formed.

(E) Effect: In the first annular groove group and the second annular groove group, by setting the ratio (A, /B) of the axial gap A to the radial gap B to about 2 or more, it is possible to produce defective products. By suppressing the occurrence rate to less than 30% and making the ratio about 5 or less, good dehumidification performance can be ensured.

Further, when a tongue piece is formed at the opening end of the second annular groove group,
This tongue piece is worn out by short-term friction with the inner surface of the first annular groove group, so even if the tongue piece comes into contact with the inner surface of the first annular groove group due to a dimensional error, if the double-sided fan is rotated for a short time, , the tongue pieces are worn and a gap of several mm or less is automatically formed. Further, the tongue piece may be brought into contact with the inner surface of the first annular groove group in advance at the time of loose fitting.

(F) Embodiment An embodiment of the present invention will be described based on the drawings. However, since the configuration other than the double-sided fan and the partition plate is the same as that of the conventional example, the same reference numerals will be used and the explanation will be omitted.

1 to 3 show a first embodiment, and FIG. 1 is a view corresponding to section A in FIG. 5.

In FIG. 1, the axial clearance between the rotating groove group 79 and the fixed groove group 80 is designated as A, and the radial clearance is designated as B. And the second
The figure shows a certain amount (for example, 1 mm) so that the gap B is 2 mm.
00 pieces) are molded, and the frequency is distributed according to the error in the axial direction.

For example, the error is most often 2 mm, but if this is used, in a dryer in which the gap A is set to less than 2 mm, the tip of the rotary groove group 79 will be on the inner surface of the fixed groove group 80 when assembled. will come into contact. Generally, when mass-producing dryers, it is minimum necessary to have a non-defective rate of 70% or more, and in FIG. 2, 70% of the total number of dryers have an error of 4 mm or less. That is, if the gap A is set to 4 mm, 70% of the molded double-sided fans will be good products, so it can be seen that it is desirable that A/'B be 2 or more.

On the other hand, the larger the cross-sectional area of the air path within the labyrinth connection, the more
The sealing effect is reduced due to the easy passage of wind, and FIG. 3 shows this characteristic.

In other words, the horizontal axis represents A/B, and the vertical axis represents humidity removal.As can be seen from this figure, up to A/B = 5, humidity removal is stable at a nearly saturated state, but above 5, humidity removal is stable. From this point onwards, the dehumidification rate drops rapidly. In other words, the larger A/B is, the larger the cross-sectional area of the air passage is, which reduces the sealing effect and dehumidifies, so it is desirable that A/B is 5 or less. In addition, the dehumidification period is (cloth weight after drying)/(
Fabric weight before drying)xlOO(%).

Taking all the above into consideration, A/B needs to be within the range of 2 or more and 5 or less. In Fig. 2, those with an error of 6 mm or less (A/B≧3) correspond to 95% of the total number, and in Fig. 3, those with A/B≦4 indicate that the humidity cannot be removed. Since it is expensive, the best embodiment is to set 3≦A/B≦4.

FIG. 4 shows the second embodiment, and is a view corresponding to section A in FIG. 5.

.. is a thin tongue piece integrally formed at each tip of the wall 79a of the rotating groove group 79, and as shown in FIG. 4(a), the length ( Approximately 1mm
)have. When the double-sided fan 71 rotates, the tongue pieces 1 are worn out in about 30 seconds due to friction with the fixed groove group 80, and as shown in FIG.
An extremely small gap P is formed in the axial direction between each tip and the fixing groove group 80. In this embodiment, the tongue pieces 1 are worn out during a trial run (1 to 2 minutes) at the factory.

Note that the tongue pieces 1 may be provided in the fixing groove group 80.

(g) Effects of the Invention 2 In the dryer according to claims 1 and 2 of the present invention, it is possible to reduce the effort of managing the dimensions between the partition plate and the double-sided fan, and it is possible to realize an improvement in productivity.

Further, in the dryer according to the first aspect, the drying efficiency is not reduced.

[Brief explanation of drawings]

FIG. 1 shows a fifth embodiment of the dryer according to the present invention.
Figure 2 is a frequency distribution diagram for errors in the axial direction of the double-sided fan; Figure 3 is a characteristic diagram of humidity removal; Figure 4 is a diagram equivalent to Figure 1 showing the second embodiment; The figure is a sectional view of the internal mechanism of a conventional clothes dryer, FIG. 6 is a rear view of the cooling air passage, and FIG. 7 is a sectional view of the fan chamber. 1. Φ tongue piece, 71.. Double-sided fan, 75.. Partition plate, 7
6...Opening, 77...Drying air path, 78...Cooling air path, 7
9... Rotating groove group, 80... Fixed groove group.

Claims (2)

[Claims] (1) A heat exchange type double-sided fan made of synthetic resin circulates drying air into the drying chamber, and external air is introduced as cooling air, and the drying air and cooling air are heated by the fan. It is a device that removes moisture by replacing it,
a synthetic resin partition plate disposed around the fan and having an opening in the center for arranging the fan to partition a drying air path and a cooling air path together with the double-sided fan; A first integrally molded concentrically on one surface of the drying air path side and the cooling air path side along the opening periphery of the partition plate.
an annular groove group; and a second annular groove group integrally molded concentrically along the outer periphery of the fan and loosely fitted into the first annular groove group in a non-contact state; In the groove group and the second annular groove group, an axial clearance A and a radial clearance B
A dryer characterized in that the ratio (A/B) of (2) A heat exchange type double-sided fan made of synthetic resin circulates drying air into the drying chamber, and external air is introduced as cooling air, and the drying air and cooling air are heated by the fan. It is a device that removes moisture by replacing it,
a synthetic resin partition plate disposed around the fan and having an opening in the center for arranging the fan to partition a drying air path and a cooling air path together with the double-sided fan; A first integrally molded concentrically on one surface of the drying air path side and the cooling air path side along the opening periphery of the partition plate.
a second annular groove group, which is integrally molded concentrically along the outer periphery of the fan, and is loosely fitted into the first annular groove group;
a group of annular grooves, at least one of the first annular groove group and the second annular groove group has an open end integrally formed with a tongue piece that is worn out by a short period of friction with the inner surface of the other annular groove group. A dryer characterized by: