JPS622840B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drying device for laundry, and more particularly to a drying device suitable for continuously drying a large amount of sheets in a laundry factory.

[Prior art]

Conventionally, a device as shown in FIG. 1 has been mainly used in laundry factories to continuously dry large quantities of sheets. That is, on one side of a plurality of (for example, four) rolls 1 arranged in parallel, a chieste 2 (a closed container capable of supplying high-temperature steam, generally called a chieste) having a concave arc cross section is dried. This device is arranged so as to maintain a gap between the sheets 3 to pass through, supply high-temperature steam into each chest 2, and discharge hot water generated inside the chest 2 to the outside. To dry the sheets 3 with this device, while rotating the roll 1, insert the sheets 3 to be dried from one side of the device in the direction of the arrow 4.
The sheets 3 fed in are dried by receiving heat from the chest 2 supplied with steam, and the dried sheets 3' are fed out one after another from the other side of the device. .

[Problem that the invention seeks to solve]

In this case, the amount of heat Q that the sheet 3 receives from the chest 2 side is as follows: If the heat transmission coefficient of the contact surface between the chest 2 and the sheet 3 is Uc, the contact area is A, and the temperature difference is △T, then Q = Uc・A・△T ……(1) is the relationship. In this conventional drying device, the steam supplied to CHEST 2 is discharged as hot water.Due to the structure, the specific volume of steam and hot water is high (about 185:1), so the flow rate of steam is slow ( 1) The heat transfer coefficient Uc in the equation had a small characteristic. Therefore, in order to improve drying productivity,
By increasing the steam pressure and increasing the internal temperature of Chest 2, the temperature difference △T in equation (1) above was increased and the amount of heat transfer Q was increased, but by increasing the steam pressure However, there are certain limits to improving productivity, and at the same time, if the internal temperature of the chest is increased,
There were many problems, such as burning, or even not burning, and not being able to achieve a soft finish. Therefore, an object of the present invention is to increase the heat transmission coefficient Uc to sheets by increasing the flow rate of steam in the chest, thereby increasing the amount of heat transfer Q, and improving drying productivity. Another object of the present invention is to eliminate burning of sheets and provide a soft finish with high productivity.

[Means for solving problems]

In order to achieve the above object, the present invention provides a laundry drying apparatus in which a steam line is connected to the steam supply port of the chest via an ejector, and the gas phase side of the flush tank is connected to the suction side of the ejector. This laundry drying apparatus is characterized in that the inlet of the flush tank is connected to the steam outlet of the chest, and the liquid phase side of the flush tank is connected to a drain line via a steam trap.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows a first embodiment of the present invention.
For each chest 2 in the drying device shown in the figure, an ejector 6 is connected to the steam supply port 5 of the chest 2.
Connect the steam line 7 through the ejector 6
The gas phase side 8a of the flash tank 8 is connected to the suction side 6a of the
At the same time, the inlet 8b of the flush tank 8 is connected to the steam outlet 9 of the chest 2. The liquid phase side 8c of the flash tank 8 is connected to a drain line 11 via a steam trap 10. In the figure, 12 is a bypass line attached to the ejector 8, 13 is a bypass valve, and 14 is an on-off valve. The ejector 6 and the flash tank 8
are housed in one housing 15, and have a connection part 16 to the steam line 7, a connection part 17 to the steam supply port 5 of the chest 2, a connection part 18 to the steam outlet 9 of the chest 2, and a connection part 18 to the steam trap 10. Each of the connecting parts 19 is composed of a flange or other connecting tool, and is taken out to the outside of the housing 15.

Next, the operation of the above embodiment will be explained. That is, the bypass valve 13 is closed and the steam supply port 5 of the chest 2 is closed.
When the on-off valve 14 of the chest 2 and the on-off valve 14 of the steam outlet 9 of the chest 2 are opened to send high-temperature steam from the steam line 7, the steam flows into the chest 2 through the ejector 6, and the steam discharge port 9 of the chest 2 is opened.
heat up. When the steam passes through the ejector 6, the suction side 6a of the ejector 6 sucks the steam in the flash tank 8, and this suctioned steam also merges with the steam sent from the steam line 7 and is sent to the chest 2 side. As a result, the inside of the flash tank 8 is sucked by the ejector 6,
The steam and liquefied hot water in the chest 2 are sucked into the inlet 8b side of the flash tank 8 via the steam outlet 9. Cheest 2
The steam and hot water that pass through the inlet and are sucked into the inlet 8b are flushed into the flush tank 8 from the inlet 8b, and the steam is again sucked into the suction side 6a of the ejector 6 and returned to the chest 2. While circulating, the hot water accumulated in the flash tank 8 is transferred to the steam trap 1 connected to the liquid phase side 8c.
0 and is discharged to the drain line 11 side.

As a result of the above, hot water is actively discharged from the steam circulation path of Chest 2, and the flow rate of steam increases, so that the heat transfer coefficient Uc between Chest 2 and the items to be dried such as sheets 3 is reduced. It can be made larger. Therefore, the heat transfer amount Q in the above equation (1) also becomes large, and the productivity of drying can be improved. Furthermore, since the drying work can be carried out without increasing the internal temperature of the Chest 2, it is possible to prevent the sheets from burning and give them a soft finish.

Next, in the first embodiment described above, one ejector 6, one flush tank 8, and one steam trap 10 are required for one chest which constitutes a drying device, whereas FIG. In the second embodiment shown in FIG. 1, the present invention is implemented using one set of ejector 6, flash tank 8, and steam trap 10 for a plurality of chests 2. That is, multiple (the figure shows four) Chest 2, 2
The steam supply ports 5, 5 of the chests 2, 2 are connected to the supply line 20, and the steam line 7 with the ejector 6 interposed therebetween is connected to the supply line 20, and the steam discharge ports 9, 9 of the chests 2, 2 are connected to the discharge line 21.
The discharge line 21 is connected to the inlet 8b of the flush tank 8. The connection structure between the ejector 6, the flash tank 8, and the steam trap 10 is the same as that of the first embodiment, and the ejector 6 and the flash tank 8 are housed in a single housing 15.

In this second embodiment, steam sent from the steam line 7 through the ejector 6 flows simultaneously into the plurality of chests 2, 2 through the supply line 20, and heats each chest 2, 2. Also, like the previous example, each chest 2, 2 is in the flash tank 8.
The steam and hot water inside is sucked through the discharge line 21. Therefore, also in this embodiment, the hot water in the chests 2, 2 is actively discharged,
As a result, the flow rate of steam becomes faster, increasing the heat transmission coefficient Uc as in the first embodiment, and increasing the heat transfer amount Q.
can also be increased. This improves productivity, prevents sheets from burning, and provides a soft finish.

〔Effect of the invention〕

As described in detail above, the present invention provides a laundry drying apparatus in which a plurality of rolls are arranged in parallel, a chest is provided opposite to each other on one side of each roll, and steam is supplied into the chest. A steam line is connected to the steam supply port of the chest via an ejector, the gas phase side of the flash tank is connected to the suction side of the ejector, and the inlet of the flash tank is connected to the steam discharge port of the chest. This laundry drying device is characterized in that the liquid phase side of the flush tank is connected to the drain line via a steam trap, so that the hot water in the chest can be well discharged and the steam flow rate can be increased. is possible, increasing the amount of heat transfer Q without increasing the temperature difference △T between the chest and sheets,
It has the effect of improving drying productivity, and
It has the effect of preventing sheets from burning and giving them a soft finish.

Further, in a laundry drying device in which a plurality of rolls are arranged in parallel, a chest is provided opposite to each other on one side of each roll, and steam is supplied into the chest, a steam supply port of the chest is provided. A steam line is connected to the pump through the ejector, and the gas phase side of the flash tank is connected to the suction side of the ejector, and the inlet of the flash tank is connected to the steam outlet of the chest. In a laundry drying device characterized in that the liquid phase side is connected to a drain line via a steam trap; the ejector and flush tank are housed in one housing, and the steam line and chest This laundry drying device is characterized in that a steam supply port, a steam discharge port, and a connection portion for a steam trap are each taken out from the outside of the casing. The steam line, steam supply inlet and outlet of the chest, and the connection parts for the steam trap were each taken out of the case, so this case was attached to the existing drying equipment, and the connections for each connection part were taken out of the case. The present invention can be easily applied by simply performing connection work.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of a laundry drying apparatus to which the present invention is applied, Fig. 2 is a block diagram of the first embodiment of the present invention, and Fig. 3 is a block diagram of the second embodiment of the present invention. be. 1... Roll, 2... Chest, 3... Sheet, 5... Steam supply port, 6... Ejector, 6
a... Suction side, 7... Steam line, 8... Flash tank, 8a... Gas phase side, 8b... Inflow port, 8c... Liquid phase side, 9... Steam outlet, 1
0... Steam trap, 11... Drain line, 15... Housing, 16, 17, 18, 19...
Connection part.

Claims (1)

[Scope of Claims] 1. A laundry drying device in which a plurality of rolls are arranged side by side, a chest is provided opposite to each other on one side of each roll, and steam is supplied into the chest. A steam line is connected to the steam supply port of the chest via an ejector, the gas phase side of the flash tank is connected to the suction side of the ejector, and the inlet of the flash tank is connected to the steam discharge port of the chest. A laundry drying device characterized in that the liquid phase side of a flush tank is connected to a drain line via a steam trap. 2. In a laundry drying device in which a plurality of rolls are arranged in parallel, a chest is provided oppositely on one side of each roll, and steam is supplied into the chest, the steam supply port of the chest is A steam line is connected through the ejector, and the gas phase side of the flash tank is connected to the suction side of the ejector, and the inlet of the flash tank is connected to the steam outlet of the chest. In a laundry drying device characterized in that the phase side is connected to a drain line via a steam trap; the ejector and the flush tank are housed in one housing, and the steam line and the steam A laundry drying device characterized in that a supply port, a discharge port, and a connection portion for a steam trap are each taken out from the outside of the casing.