JPH01131698A - Dryer - Google Patents

Abstract

PURPOSE: To prevent the flowing of air between an exhaust introducing room and an outside air introducing room without using a seal member and a slidable contact member, to improve the assembling operability by providing an annular wall part at a fan casing to be confronted with the centrifugal stream of outside air by a wind for introducing outside air of a fan. CONSTITUTION: The annular wall part 31 is provided at a mouth part for arranging the fan 30 of the fan casing 6 to be confronted with the centrifugal stream of outside air by the wind for introducing outside air 11 of the fan 8. Thus, pressure between the exhaust guiding room and the outside air introducing room 15 are nearly equalized to eliminate flowing of air between both of the rooms 14 and 15. As the result of this, as against a conventional drier, a seal member is unnecessitated and work for fixing the seal member to the fan is also unnecessitated to improve assembling operability. In addition, since the slid contact member attached to the seal member is also unnecessitated, a cost can be lowered. In addition, since the seal member is not required to use, the stabilizing of air flow preventing performance and smoothing of driving of the fan 8 can be realized.

Description

Detailed Description of the Invention "14th aspect of the invention" (Field of application in industry-1-) The present invention provides a dryer having a structure in which air discharged from a drying chamber flows into a heat exchanger to exchange heat with outside air. Regarding.

(Prior art) In this type of dryer, a double-blade centrifugal fan with blades formed on both sides of a rotating main plate is used as a heat exchanger. The fan is configured to circulate exhaust air from the drying chamber and outside air to both sides of the fan for heat exchange. In the case of this one,
The above-mentioned fan is rotatably arranged so that the inside of the fan casing is divided into an introduction chamber for the exhaust air from the drying room and an introduction chamber for outside air. Since the pressure loss is greater than that of the air guide blades, the pressure inside the exhaust gas introduction chamber is higher than the pressure of the outside air guide blades, causing exhaust gas to leak from the exhaust gas introduction chamber to the outside air introduction chamber. In order to prevent this, a sealing member made of felt or heat-resistant nylon is attached to the outer peripheral end of the fan, and a sliding member made of stainless steel or the like is attached to the fan casing side, and the sealing member is brought into sliding contact with the sliding member. By doing so, the space between the exhaust gas introduction chamber and the outside air introduction chamber is sealed.

(Problems to be Solved by the Invention) However, in the above conventional configuration, when attaching the seal member to the outer peripheral end of the fan, a mounting groove is formed in the outer peripheral end, and one end of the seal member is inserted into the mounting groove. However, in order to strengthen the fixing strength, adhesive is applied inside the mounting groove and the sealing member is fixed in place, which makes the process of applying the adhesive cumbersome, making it difficult to install the sealing member. There was a problem that the workability was poor and the assembly workability was poor.

Furthermore, since a sealing member and a sliding member are required to seal between the exhaust gas introduction chamber and the outside air introduction chamber, the cost becomes relatively high. Furthermore, since the sealing member and the sliding member are in sliding contact, there is a risk that the sealing member will wear out and the sealing performance will deteriorate, and that air will flow between the exhaust introduction chamber and the outside air introduction chamber. Ta. Historically, if the sliding resistance between the sealing member and the sliding contact key is large, the belt that is passed between the fan pulley and the drive motor boob will malfunction, causing the fan to stop driving. Another drawback was that it was not carried out smoothly.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a dryer that can improve assembly workability, reduce costs, stabilize air flow prevention performance, and facilitate fan drive.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a double-blade centrifugal fan that also serves as a heat exchanger so as to partition the inside of a fan casing into an exhaust introduction chamber and an outside air introduction chamber. The rotation of the fan causes air discharged from the drying chamber to flow into the exhaust introduction chamber and outside air to flow into the outside air introduction chamber, thereby exchanging heat between the exhaust air and the outside air through the fan. The dryer is characterized in that the fan casing is provided with an annular wall portion facing the centrifugal flow of outside air produced by the outside air introducing device.

(Function) Generally, the pressure in the exhaust introduction chamber is higher than the pressure in the outside air conductor blade. On the other hand, since the fan casing is provided with an annular wall that faces the centrifugal flow of outside air caused by the outside air introduction device of the fan, this wall converts the centrifugal flow of outside air from dynamic pressure to static pressure. Since the pressure is increased, the pressures of the compartments at the boundary between the exhaust gas introduction chamber and the outside air introduction chamber become approximately balanced, and the exhaust gas from the exhaust gas introduction chamber does not leak to the outside air guide blade. As a result, there is no need for a sealing member for sealing between the compartments.

(Example) Hereinafter, a first example in which the present invention is applied to a so-called circulation type drum dryer will be described with reference to FIGS. 1 to 5.

First, in Figures 2 and 3, 1 is the outer box of the dryer,
An entrance/exit 3 for drying material is formed on the front surface of the opening 3, which is opened and closed by a door 2. 4 is a drying chamber, for example, a drum, whose front side is rotatably fitted and supported by an annular support part 5 protruding from the front back side of the outer box 1, and whose rear side is connected to the outer box 1.
The fan casing 6 is rotatably fitted into and supported by a partition wall plate portion 7 of a fan casing 6 fixed to the rear portion of the fan casing. 8 is a double-blade centrifugal fan that also serves as a heat exchanger, which is connected to the fan casing 6 above.
It is rotatably arranged inside. This fan 8 is the fourth
As shown in the figures and FIG. 5, by forming the annular region of the circular plastic main plate 9 into a wave shape along its circumferential direction, an exhaust gas introduction base 10 and an outside air introduction tool 11 are provided on both sides of the main plate 9. An annular end plate part 12 is formed at the outer peripheral end, and is rotatably supported by a shaft 13 fixed to the partition wall plate part 7, thereby connecting the inside of the fan casing 6 to the exhaust introduction chamber 14 and the outside air. It is divided into an introduction chamber 15.

Further, the fan casing 6 is made of plastic and has an overall dish-shaped container shape with an open back surface, and the back surface is closed by the back plate 16 of the outer box 1.

In order to suck the air in the drum 4 into the exhaust introduction broom 14 and return it into the drum 4, an inlet 17 and an outlet 18 that open into the drum 4 are provided at the center and lower part of the front surface of the partition plate 7. It is formed. Further, an inlet 19 and an outlet 20 are formed in the back plate 16 in order to draw outside air into the outside air introduction chamber 15 and discharge it to the outside.

21 is the air (
Exhaust air) A filter to capture and remove lint, etc. from the exhaust air.
A heater 22 is disposed at the discharge port 18 to heat the air returned from the exhaust introduction chamber 14 into the drum 4. A motor 23 rotates the drum 4 and the fan 8 via a drum belt 24 and a fan belt 25, respectively. In addition, in Figure 3, 26
27 is an operation panel, 27 is a power switch, and 28 is a door oven button.

Now, inside the fan casing 6, the exhaust introduction chamber 14
The seal structure between the air intake chamber 1 and the outside air introduction chamber 15 will be described in detail with reference to FIG. That is, reference numeral 29 denotes an annular partition formed to protrude inwardly from the partition wall plate 7, and an annular fan arrangement opening is provided on the inner circumference of the partition, facing the annular end plate 12 of the fan 8. A portion 30 is formed. Here, 31 is an annular wall part, which is formed integrally with the partition part 29 so that its fan arrangement opening 30 extends to the rear no. It faces the centrifugal flow of outside air produced by the tool 11. This wall portion 31 has
An annular protrusion 31a that protrudes toward the center at its tip.
is provided. Reference numeral 32 denotes a cover member having an annular shape and a substantially inverted cross-section, which is attached to a portion of the inner circumferential surface of the fan arrangement opening 30 located on the side of the exhaust introduction tool 10 of the fan 8; A gap a is set between the annular end plate portion 12 and the annular end plate portion 12 . On the other hand, 33 is an annular protruding wall portion having a generally inverted cross section, which protrudes outward at a portion of the outer peripheral surface of the annular end plate portion 12 located on the side of the outside air introduction blade 11 of the fan 8. It is integrally formed so as to have a gap between it and the fan arrangement opening 30. As a result, a pressure balance space 34 is formed between the annular end plate 12 and the fan arrangement opening 30. Here, the wall portion 31 has an extension dimension δ from a projecting wall portion 33 which is an outlet of the centrifugal flow of outside air caused by the outside air introduction device 11 of the fan 8, and faces the centrifugal flow (see FIGS. (See Figure 5).

In FIGS. 2 and 4, 35 is a drain hole formed at the bottom of the fan casing 6 so as to be located on the exhaust introduction chamber 14 side, and 36 is a drain hole provided on the side of this drain hole 35. The water receptacle is a container, and a hose (not shown) is connected to the container 36.

Next, the action of the -1-styl structural acid will be explained.

When the drying operation is started, the drum 4 and the fan 8 are driven to rotate by the motor 23, and the centrifugal blowing action caused by the rotation of the fan 8 moves the air inside the drum 4 into the exhaust introduction chamber 14.
In the process of being sucked into the drum 4 and returned to the drum 4, the
2, the outside air is drawn into the outside air introduction chamber 15 through the suction port 19, and is discharged outward through the discharge port 20. The air that has been hot-aired by the heater 22 and supplied into the dome 4 generates moisture from the dried material, and is then sucked into the exhaust introduction chamber 14 again, where it is heated by the fan 8. It circulates by exchanging heat with the outside air by conduction, cooling and dehumidifying it, and then being hot-aired again and supplied into the drum 4. Water generated by dehumidifying the air from the drum 4 is discharged from the drainage hole 35 into the water container 36.

Therefore, in the exhaust gas introduction chamber 14 of the fan casing 6, the pressure loss becomes large due to the provision of the filter 21 and the heater 22, and the pressure loss in the outside air introduction chamber 14 increases.
It is higher than the pressure inside 5. On the other hand, an annular wall 31 is provided at the fan arrangement opening 30 of the fan casing 6, and this wall 31 is connected to the outside air introduction tool 1 of the fan 8.
1, the dynamic pressure of the centrifugal flow of outside air is converted into static pressure by the wall portion 31,
The pressure increases in this portion, that is, the portion on the outside air introduction chamber 15 side where the annular end plate portion 12 of the fan 8 and the fan placement opening portion 30 of the fan casing 6 face each other. Therefore,
Since the respective pressures on the exhaust gas introduction chamber 14 side and the outside air introduction chamber 15 side are approximately balanced across the annular end plate portion 12 and the fan device opening portion 30, the annular end plate portion 12 and the fan arrangement mouth portion 30 are Even if there are gaps a and b between them, the exhaust gas in the exhaust introduction chamber 14 will not leak into the outside air introduction chamber 15.

According to this embodiment having such a configuration, the following effects can be obtained. That is, by providing the annular wall 31 in the fan arrangement opening 30 of the fan casing 6 so as to face the centrifugal flow of outside air caused by the outside air introduction lAl1 of the fan 8, the exhaust gas introduction chamber 14 and the outside air introduction chamber 15 can be separated. The pressures between the compartments 14 and 15 can be approximately equalized, and therefore, air circulation between the compartments 14 and 15 can be eliminated. As a result, unlike in the past, the sealing member is not required, and the work of attaching the sealing member to the fan is also no longer necessary, thereby improving assembly workability.

Moreover, since the sliding member attached to the sealing member is not required, costs can be reduced. Furthermore, since there is no need to use the seal part +1, the seal member may wear out due to sliding contact between the seal member and the sliding contact member, or the sliding contact resistance between the seal member and the sliding member may be large. The problem of the fan not being driven smoothly is eliminated, and the air flow prevention performance is stabilized and the fan 8 is driven smoothly.

In addition, in this embodiment, since the protrusion 31a that protrudes toward the center is provided at the tip of the wall portion 31, the centrifugal flow of outside air by the outside air introduction wing 1 is converted from dynamic pressure to static pressure. In addition, the air circulation prevention performance can be further improved.

FIG. 6 shows a second embodiment of the present invention, and only the differences from the first embodiment will be explained. In this FIG. 6, 37 is a fan replacing the fan 8, and this is the main plate 9. Exhaust air introduction blade 10. Outside air introduction blade 11 and annular end plate portion 12
The main plate 38 and the exhaust introduction blade 39 respectively replace the main plate 38 and the exhaust introduction blade 39. It consists of an outside air introduction m40 and an annular end plate part 41. Here, the annular end plate portion 41 is configured to respectively close each wave-shaped city and each valley portion of the outer peripheral end portion of the main plate 38, and the boundary portion between the surface portion and the valley portion, that is, the exhaust introduction chamber. 14 and the outside air introduction chamber 15, a ring portion 4 protrudes outward.
2 is formed. And in this second example,
A wall portion (not shown) provided on the fan casing is arranged to face the ring portion 42, which is the outlet of the centrifugal flow of outside air introduced by the fan 37 and the outside air introduced by the tool 40, with an extension dimension δ.

Therefore, in this second embodiment as well, substantially the same effects as in the first embodiment can be obtained.

FIG. 7 shows a third embodiment of the present invention, and only the differences from the first embodiment will be explained. In this FIG. 7, reference numeral 43 denotes a partition section in place of the partition section 29, and on the inner periphery of this is a fan arrangement opening 4 instead of the fan arrangement opening section 3G.
4 is formed, and a plurality of claw portions 45 are provided intermittently protruding over the entire inner circumference of the fan 8 so as to face the projecting wall portion 33 of the fan 8 . Reference numeral 46 denotes a cover part replacing the cover member 32, which is integrally formed on the inner peripheral surface of the fan arrangement opening 44, and a gap A is set between it and the annular end plate part 12 of the fan 8. It is now possible to do so.

Reference numeral 47 denotes a cylindrical member corresponding to the wall 31, which is composed of a cylindrical wall 47a and a flange 47b protruding from the outer periphery of the cylindrical member. 44 and when the flange 47b is brought into contact with the partition 43, the engagement protrusion 47 that protrudes from the outer periphery of the cylindrical wall 47a
c engages with the claw portion 45, and is thereby removably attached to the partition portion 43, that is, the fan casing 6. A gap B is set between the cylindrical wall portion 47a of the cylindrical member 47 and the projecting wall portion 33 of the fan 8, so that the annular end plate portion 12 of the fan 8 and the fan placement opening 44 A pressure balance space 48 is formed between them. Moreover, the cylindrical member 47
is the extension dimension δ of the cylindrical wall portion 47a from the projecting wall portion 33 which is the outlet of the centrifugal flow of outside air by the outside air introducing blades 11 of the fan 8.
1 to the rear so as to face the centrifugal flow. Here, a protrusion 47d replacing the protrusion 31a is formed at the tip of the cylindrical wall portion 47a so as to protrude toward the center. It is set to be smaller than the diameter dimension, and is wrapped around the projecting wall portion 33 of the fan 8 so that the wrap dimension is 62 mm.

Therefore, in the third embodiment as well, it is possible to obtain the same effects as in the first embodiment.
The inner diameter of the protrusion 47d of the fan 7a is set to be smaller than the outer diameter of the fan 8, and the protrusion 47d of the fan 8 is wrapped around the protrusion wall 33 of the fan 8 so that the length thereof becomes δ2. The centrifugal flow of outside air by the outside air introduction blades 11 of the fan 8 can be made easier to convert from dynamic pressure to static pressure, and the air flow prevention performance can be further improved. In this case, since the cylindrical member 47 is detachably attached to the fan casing 6, even if the inner diameter χ of the protrusion 47d is set to be smaller than the outer diameter of the fan 8, the fan 8 can be installed or replaced without any hassle.

Moreover, in the -1-2 third embodiment, the fan casing 6
Since the cylindrical member 47 is removably attached to the fan casing 6 by engaging the engagement protrusion 47c of the cylindrical member 47 with the claw portion 45 of the partition portion 43, the attachment of the cylindrical member 47 is easy. will make your work easier.

[Effects of the Invention] As is clear from the explanation below -1-, the present invention has a structure in which an annular wall is provided in the fan casing so as to face the centrifugal flow of outside air caused by the outside air introduction blades of the fan. It is possible to prevent air flow between the exhaust gas introduction chamber and the outside air introduction chamber without using sealing members or sliding contact members, thereby improving assembly workability, reducing costs, and further This has the excellent effect of stabilizing air circulation prevention performance and smoothing fan drive.

[Brief explanation of the drawing]

1 to 5 show one embodiment of the present invention, in which FIG. 1 is an enlarged longitudinal sectional side view of the main part, FIG. 2 is an overall longitudinal sectional side view, and FIG. 3 is an overall front view. FIG. 4 is an overall rear view with the back plate removed, and FIG. 5 is a partial perspective view of the fan. Further, FIG. 6 is a diagram corresponding to FIG. 5, FIG. 10, showing a second embodiment of the present invention, and FIG. 7 is a diagram corresponding to FIG. 1, showing a third embodiment of the present invention. In the drawing, 4 is a drum (drying room) and 6 is a fan. - Sink, 8.37 is a fan, 11.40 is an outside air introduction blade, 14 is an exhaust introduction chamber, 15 is an outside air introduction chamber, 16 is a back plate, 30.44 is a fan arrangement opening, 31 is a wall, 31a
47 is a cylindrical member (wall), and 47d is a protrusion.

Claims (1)

[Claims] 1. A double-blade centrifugal fan that also serves as a heat exchanger is disposed to partition the inside of the fan casing into an exhaust gas introduction chamber and an outside air introduction chamber, and the fan rotates to discharge air from the drying chamber. In the fan casing, an outside air guide is provided in the fan casing, and the fan casing is provided with an outside air guide. A dryer characterized by having an annular wall facing the centrifugal flow of outside air caused by the blades. 2. The dryer according to claim 1, wherein the wall portion has a protrusion that protrudes toward the center at its tip. 3. A patent characterized in that the inner diameter of the protrusion is set to be smaller than the outer diameter of the fan, and the wall portion having the protrusion is removably attached to the fan casing. A dryer according to claim 2.