JP2000055555A - Cylinder dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cylinder dryer in which lowering of heating efficiency and fluctuation of heating are prevented by discharging drain generated in the cylinder dryer quickly. SOLUTION: A cylinder dryer 1 is provided with a vapor supply opening 3 and a siphon tube 5. The vapor supply opening 3 is coupled through an ejector 10 with a vapor supply pipe 6. The siphon tube 5 is conducted, on the outlet side thereof, with a drain storing section 9 coupled, at the upper part thereof, with the suction chamber 14 of the ejector 10 through an interconnecting path 13. The drain storing section 9 is coupled, at the lower part thereof, with a steam trap 15. Drain standing on the inner wall face of the dryer 1 flows through the opening 4 into the drain storing section 9, flushing vapor is sucked into the ejector 10 and drain is discharged from the steam trap 15 to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder dryer mainly used for heating and drying long products in a paper mill, a textile mill, and the like.
The present invention relates to a cylinder dryer capable of rapidly discharging drain as condensed water of steam generated in a dryer to the outside.

In a cylinder dryer, the drain generated inside the dryer must be discharged to the outside as quickly as possible in order to increase the heating efficiency and maintain the quality of the product as a dried product. In particular, drain staying on the inner wall surface of the dryer is preferably removed as quickly as possible to prevent the latent heat of the steam from being transmitted to the inner surface of the dryer and reduce the heat transfer coefficient.

[0003]

2. Description of the Related Art As a conventional cylinder dryer,
For example, there is one disclosed in JP-A-4-343787. In this method, a steam trap is connected to one end on the outlet side of a siphon pipe via a drain pipe, and drain generated inside the dryer can be discharged from the steam trap to the outside.

[0004]

SUMMARY OF THE INVENTION In the above prior art,
The drain flowing down the siphon pipe toward the steam trap is heated by the steam supplied from the steam supply pipe into the dryer, and turns into steam again to reach the steam trap. There was a problem that the drain could not be discharged.

[0005] The steam trap is a type of an automatic valve which opens when a drain flows in and discharges the drain to the outside, but closes when steam flows in to prevent leakage of the steam to the outside. However, if what was originally drain is heated and becomes steam once and flows into the steam trap, the steam trap closes. Thus, the fact that the steam trap closes due to the mixture of steam even though the drain is present at the inlet side of the steam trap is called a steam locking phenomenon of the steam trap.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cylinder dryer capable of preventing a steam locking phenomenon and quickly removing drain generated inside the dryer via a steam trap.

[0007]

In order to solve the above-mentioned problems, the means of the present invention is to provide a steam supply pipe for supplying steam to the inside of a dryer which rotates via a rotary joint, with a steam supply port of the dryer. A siphon pipe for connecting and discharging a drain generated inside the dryer to the outside is provided.The steam supply pipe is connected to a steam supply port via an ejector, and a substantially sealed drain reservoir connected to the siphon pipe is provided. It is arranged outside the dryer to provide a communication passage communicating the upper part of the drain reservoir with the suction chamber of the ejector, and to connect a steam trap below the drain reservoir.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Steam supplied through an ejector into a cylinder dryer is deprived of heat and condensed to form a drain. Since the cylinder dryer is usually used while rotating, the centrifugal force acts on the drain in the rotation direction, and as a result, the drain collects along the cylindrical inner wall surface.
This drain goes from the siphon tube to the drain reservoir. By communicating the upper part of the drain reservoir with the suction chamber of the ejector through the communication passage, the re-evaporated vapor of the drain in the drain reservoir is sucked into the ejector. On the other hand, the drain in the drain reservoir is discharged to the outside through a steam trap connected below.

[0009] By reliably separating the re-evaporated vapor and the drain in the drain reservoir, the re-evaporated vapor is sucked into the ejector, and only the drain is removed from the steam trap to the outside.
No re-evaporated steam flows into the steam trap,
Therefore, the steam locking phenomenon does not occur.

[0010] The re-evaporated steam sucked into the ejector is mixed with steam supplied from a steam supply pipe and supplied from the steam supply port into the dryer. By suctioning the re-evaporated vapor in the drain reservoir with the ejector, a large pressure difference occurs between the pressure inside the dryer and the pressure in the drain reservoir,
The drain inside the dryer can quickly flow down to the drain reservoir.

[0011]

FIG. 1 is a partial cross-sectional view of a cylinder dryer 1 according to an embodiment of the present invention. A steam supply port 3 and a siphon pipe 5 are provided on a horizontally long cylindrical cylinder dryer 1 via a rotary joint 2. A drain reservoir 9 is arranged outside the dryer 1 in communication with the siphon tube 5. A steam supply pipe 6 communicating with a steam source (not shown) is connected to the steam supply port 3, and an ejector 10 is interposed between the steam supply ports 3. The steam supply port 3 is connected to the rotary joint 2
It communicates with the inside of the cylinder dryer 1 through a passage 12 inside.

A drain pipe 8 is connected to an end of the siphon pipe 5 on the rotary joint 2 side through a drain discharge port 7.
And the drain reservoir 9 are connected. The drain reservoir 9 has a substantially closed shape, and a communication passage 13 is attached to the upper portion thereof.
0 and communicate with the suction chamber 14. Below the drain reservoir 9,
Connect the steam trap 15. A part of the communication path 13 is branched, and a path 16 communicating with the outlet side of the steam trap 15 is provided. A valve 17 whose opening can be adjusted is attached to the passage 16. Valve 17 and passage 1
6 is for forcibly removing a part of the vapor re-evaporated in the drain reservoir 9 to the outlet side of the steam trap 15.

The cylinder drier 1 is rotatably arranged around the central axis of the rotary joint 2, and the object to be heated in contact with the outer periphery of the cylinder drier 1 (not shown) is indirectly controlled by steam supplied from the steam supply port 3. And the drain generated by this heating is allowed to flow down from the siphon pipe 5 to the drain reservoir 9 through the drain discharge connection port 7 and the drain pipe 8, and the vapor re-evaporated in the drain reservoir 9 is ejected. 10 and the drain reservoir 9
The drain inside is discharged from the steam trap 15 to the outside.

An opening 4 is provided at an end of the siphon tube 5 inside the dryer 1. In this embodiment, the opening 4 is provided with a slight gap from the inner wall of the dryer 1. The other end of the siphon tube 5 is connected to a horizontal tube 11 penetrating through the rotary joint 2. The right end of the horizontal pipe 11 is connected to the drain discharge connection port 7.

The cylinder dryer 1 heats an object to be heated in contact with the outer periphery while rotating, but the steam supply port 3, the passage 12, the siphon pipe 5, the horizontal pipe 11, and the drain discharge connection port 7 do not rotate. is there.

Drain generated by heating the object to be heated in the cylinder drier 1 accumulates along the inner wall surface of the cylinder drier 1. The drain on the inner wall surface passes from the end opening 4 of the siphon pipe 5 through the horizontal pipe 11 and the drain discharge connection port 7 to the drain pipe 8 to the drain reservoir 9. Since the upper portion of the drain reservoir 9 is connected to the steam ejector 10 by the communication passage 13, the vapor re-evaporated in the drain reservoir 9 is sucked by the ejector 10 and supplied to the dryer 1 again. On the other hand, the drain in the drain reservoir 9 is discharged outside through the steam trap 15. By discharging only the drain from the steam trap 15 in this manner, no steam is mixed into the steam trap 15, and therefore, the steam locking phenomenon does not occur.

[0017]

As described above, in the cylinder dryer of the present invention, the drain reservoir connected to the siphon pipe is provided, the upper part of the drain reservoir is connected to the ejector, and the steam trap is connected below. Since the re-evaporated steam generated in the drain reservoir is sucked into the ejector, only the drain flows into the steam trap. Can be eliminated.

Further, by suctioning the re-evaporated steam generated in the drain reservoir by the ejector, a differential pressure can be secured between the inside of the dryer and the drain reservoir, and the drain inside the dryer is more easily discharged into the drain reservoir. It can flow down quickly and does not accumulate drain in the dryer.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional configuration diagram showing an embodiment of a cylinder dryer of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder dryer 2 Rotary joint part 3 Steam supply port 4 Opening 5 Siphon pipe 6 Steam supply pipe 8 Drain pipe 9 Drain reservoir 10 Ejector 13 Communication passage 14 Suction chamber 15 Steam trap

Claims (1)

[Claims] 1. A device in which a steam supply pipe for supplying steam to the inside of a dryer rotating via a rotary joint is connected to a steam supply port of the dryer, and a siphon pipe for discharging drain generated inside the dryer to the outside is provided. In the above, a substantially closed drain reservoir connected to the steam supply pipe via an ejector and connected to the siphon pipe is arranged outside the dryer, and the upper part of the drain reservoir and the suction chamber of the ejector are connected. And a communication path for communicating
A cylinder dryer having a steam trap connected below the drain reservoir.