JPS632797Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a heat exchanger formed by arranging a plurality of pipes.

[Technical background of the invention]

Conventionally, for example, in a heat exchanger for a dryer, hot air containing moisture discharged from a drying chamber is passed through a pipe of the heat exchanger, and outside air is passed outside the pipe for heat exchange. The moisture in the hot air is condensed and removed.

[Problems with background technology]

However, in conventional systems, the condensed water that has formed inside the pipe is collected at the outlet end of the pipe by the warm air passing through the pipe, and becomes beaded at that end due to the surface tension of the water. The disadvantage was that the ventilation passages became narrower, reducing the amount of ventilation and reducing heat exchange efficiency.

[Purpose of invention]

The present invention has been developed in view of the above circumstances, and its purpose is to prevent condensed water generated inside the pipe from condensing at the end of the pipe and reducing the amount of ventilation. Another object of the present invention is to provide a heat exchanger that can improve heat exchange efficiency.

[Summary of the idea]

In this invention, a downwardly directed water guide section is formed extending from the lower part of the high temperature air outlet end of the pipe, and a groove is formed in this water guide section, thereby directing the condensed water generated inside the pipe to the outlet of the pipe. The feature is that the side end portions are sucked into the grooves by capillary action.

[Example of idea]

An embodiment in which the present invention is applied to a dryer will be described below with reference to the drawings. First of all, in Figs. 1 to 3, 1 is an outer box, in which a drying material inlet/outlet 2 is formed approximately at the center of the front surface, and ventilation holes 3, 4 are formed on both sides of the outer box. Further, one vent hole 5, 6 is formed on each outer side thereof. Reference numeral 7 denotes a door provided to open and close the inlet/outlet for drying material 2; 8, one front cover that covers the ventilation holes 3 and 5 from the front in a bag-like manner; and 9, a door that covers the ventilation holes 4 and 6 from the front in a bag-like manner. This is the other front cover. Reference numeral 10 denotes a drum support which is arranged in a ring shape from the vent hole 3 to the vent hole 4 and surrounding the drying material inlet/outlet port 2 in the outer box 1. Further, a required number of ventilation holes 12 are formed in the portions facing the ventilation holes 4, and a semiconductor heater 13, for example, is disposed between the ventilation holes 11 and the ventilation holes 3. Reference numeral 14 denotes a drum with an open front side, and the open edge of the front side is supported by the drum support 10, while a shaft 15 attached to the center of the rear plate is placed horizontally at the rear end inside the outer box 1. The drum 14 is supported by a suspended support plate 16 and rotatably disposed inside the outer box 1, and the inside of the drum 14 is used as a drying chamber 17. Reference numeral 18 denotes a motor disposed at the lower corner of the outer box 1. A pulley 19 is attached to the rotating shaft 18a of the motor, and a belt 20 is stretched between the pulley 19 and the outer periphery of the drum 14. The drum 14 is rotated by the motor 18. Note that 21 is a tension pulley provided to apply a constant tension to the belt 20. On the other hand, 22 is a first duct whose base communicates with the ventilation port 6 in the outer box 1, and extends upward from there to connect to the intake port 23a of the casing 23.
It communicates with An impeller 25 attached to a fan shaft 24 is disposed within the casing 23.
Further, an impeller 27 is attached to the fan shaft 24 and disposed in a casing 26 that is arranged in parallel at the front of the casing 23 . A pulley 28 is attached to the rear end of the fan shaft 24 that protrudes outside the casing 23, and a pulley 29 is attached to the tip of the rotating shaft 18a of the motor 18. A belt 30 is stretched across the belt 30, and the impeller 25 is driven by the motor 18.
and 27 are rotated. Well, 31
is a heat exchanger disposed inside and above the outer box 1, and as shown in FIG.
A large number of heat radiating plates 33 are arranged between the heat radiating plates 32 and spaced apart from each other, and a plurality of pipes 34 are arranged so as to be slightly inclined toward the left end side in the figure, passing through the heat radiating plates 33. Further, the inner peripheral surface of the pipe 34 is coated with a hydrophilic paint. The heat exchanger 31 is connected to the discharge port 23b of the casing 23 via a connecting tube 35 at the right end of the pipe 34, and is connected to the vent 5 via a second duct 36 at the left end of the pipe 34. It is communicated. With this, warm air in the drying chamber 17, which is high-temperature air as the impeller 25 rotates, is sucked into the casing 23, passed through each pipe 34, and further passed through the second duct 36 into the drying chamber 17. I'm trying to get it back. Now, 37 is an expanded part formed at the hot air outlet side end (left end) of the pipe 34 of the heat exchanger 31, and the lower part of the expanded part 37 is slightly longer and tapered than the other parts. A water guide portion 38 extending downwardly and facing diagonally downward is formed to be connected to the bottom of the inner circumferential surface of the pipe 34, and the water guide portion 38 has a narrow base end continuous from its base end. A transparent groove 39 is formed in a V-shape. On the other hand, the front opening of the heat exchanger 31 is communicated with the exhaust port 26a of the casing 26, and the rear opening is communicated with an exhaust port 40 formed on the rear plate of the outer box 1. Reference numeral 41 denotes an outside air intake port formed on the front surface of the outer box 1 in communication with the intake port 26b of the casing 26, and is covered with a cover 42 having a filter 42a. Outside air, which is side air, is sucked into the casing 26 and is discharged from the casing 26 to the outside of the outer box 1 through an exhaust port 40 through between the heat radiating plates 33 of the heat exchanger 31.

Next, the operation of the above configuration will be explained. When the motor 18 and the semiconductor heater 13 are energized, the drum 14 is rotated based on the rotation of the motor 18, and at the same time,
The fan shaft 24 and hence the impellers 25 and 27 are rotated, while the semiconductor heater 13 generates heat. As the impeller 25 rotates, air in the drying chamber 17 is sucked into the casing 23 through the ventilation hole 12, the ventilation port 4, and the first duct 22.
3 and is discharged as wind from the heat exchanger 31.
The pipe 34 passes through the second duct 36, the vent 5, the vent 3, the semiconductor heater 13, and the vent 11.
This folded air is introduced into the drum 14, that is, into the drying chamber 17, and the semiconductor heater 1 which is in a heat generating state
3, the hot air is supplied into the drying chamber 17. This hot air removes moisture from the items to be dried that have been stored in the drying chamber 17 in advance, and then reaches the casing 23 from the vent hole 12 through the vent holes 4 and 6 and the first duct 22, and then reaches the casing 23 again. The cycle of being discharged from the casing 23 toward the heat exchanger 31 is repeated. Therefore, the warm air containing moisture discharged from the drying chamber 17 passes through each pipe 34 of the heat exchanger 31. On the other hand, due to the rotation of the impeller 27, outside air is drawn into the casing 26 from the outside air intake port 41, and this outside air is transferred to the heat sink 3 on the outer periphery of the pipe 34 of the heat exchanger 31.
3 and is discharged to the outside of the outer box 1 from the exhaust port 40. Therefore, the warm air containing moisture passing through the pipe 34 of the heat exchanger 31 is cooled by the outside air passing around the outer periphery of the pipe 34, so that the moisture in the hot air is condensed within the pipe 34. At this time, since a hydrophilic paint is applied to the inner wall surface of the pipe 34, the condensed water adheres to the inner wall surface of the pipe 34 in the form of a thin film. The dew condensation water flows along the inner circumferential surface of the pipe 34 and collects on the inner bottom side of the pipe 34 while flowing in the direction of the outlet end, which is the inclined direction. Since the water that has reached the outlet end of the pipe 34 has the transparent groove 39 formed in the water guide portion 38, the water stays there and flows through the transparent groove 3 without forming a bead.
The water is sequentially sucked into the water pipe 9 by capillary action, travels through the transparent groove 39, forms water droplets at the lower end of the water guide portion 38, and drips sequentially. Thus, according to this embodiment, unlike the conventional method in which condensed water forms droplets at the outlet end of the pipe and narrows the ventilation path,
Since water beads are not formed, the ventilation path of the pipe 34 can be prevented from being narrowed by condensed water, and the amount of ventilation can be increased compared to the conventional one, which in turn can improve the heat exchange efficiency in the heat exchanger 31. can. As a result, the amount of dehumidification in the heat exchanger 31 increases, so that the drying efficiency of the material to be dried in the drying chamber 17 can be improved. Moreover, especially in a dryer in which the semiconductor heater 13 is used as a heater for generating hot air as in this embodiment, when the amount of hot air flowing through the heat exchanger 31 decreases, the amount of air flowing through the conductor heater 13 decreases. However, according to this embodiment, as the drying operation progresses, the amount of ventilation in the heat exchanger 31 and the amount of heat generated by the semiconductor heater 13 decreases. Since it is possible to prevent a situation in which the amount of heat generated is reduced, drying time can be shortened and efficiency can be further improved.

The present invention has some key points, such as the fact that, for example, the groove of the water guide section 38 may be a simple groove with a bottom instead of the transparent groove 39, and the present invention may be applied not only to dryers but also to air conditioning ventilation fans, etc. It may be implemented with appropriate changes within the scope.

[Effect of idea]

As is clear from the above description, the present invention consists of a plurality of pipes arranged, and the high-temperature side air is passed through the pipes and the low-temperature side air is passed outside the pipes to exchange heat with the high-temperature side air. In a heat exchanger configured to condense and remove moisture inside, a downwardly directed water guide portion is formed extending from the lower part of the high temperature side air outlet side end of the pipe, and a groove is formed in this water guide portion. This feature makes it possible to prevent condensed water from forming beads at the end of the high-temperature air outlet of the pipe, increasing the amount of ventilation, which in turn improves heat exchange efficiency. It has the excellent effect of allowing

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a dryer. Fig. 1 is a front view, Fig. 2 is a cross-sectional view taken along the line - in Fig. 1, and Fig. 3 is a cross-sectional view taken along the - line in Fig. 1. 4 is an enlarged vertical sectional view of the heat exchanger portion, and FIG. 5 is an enlarged front view of the pipe. In the drawing, 31 is a heat exchanger, 34 is a pipe, 38
is a water guide portion, and 39 is a transparent groove (groove).

Claims (1)

[Scope of utility model registration request] Consisting of a plurality of pipes arranged, high-temperature air is passed through the pipes and low-temperature air is passed outside the pipes to exchange heat and condense and remove moisture in the high-temperature air. And,
A heat exchanger characterized in that a water guide portion extending downward is formed at a lower part of the end of the high temperature air outlet side of the pipe, and a groove is formed in the water guide portion.