JP2000096481A - Cylinder dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder dryer capable of quickly discharging the drain thereinside into the outside through preventing steam locking phenomena. SOLUTION: This cylinder dryer 1 has such a scheme that, a steam feed pipe 3 is connected, via an ejector 9, to a steam feed port 4; drain discharge pipes 7, 8 are connected, via respective valve means 12, 13, to a drain discharge passage channel 5, to which a drain pool 25, in turn, is connected; wherein the valve means 12, 13 open within a specified angular range in a vertically lower area to discharge drain, however, at other rotational position angles, the valve means 12, 13 close; and the upper part of the drain pool 25 is made to communicate, via a communicating channel 26, with the suction chamber 27 of the ejector 9.

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 quickly discharging drain as condensed water of steam generated inside a dryer.

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 a constant quality of the product as a heated product. In particular, drain staying on the inner wall surface of the dryer is prevented from being transferred to the inner surface of the dryer as soon as possible because the latent heat of the steam is prevented from being transmitted to the inner surface of the dryer and the heat transfer coefficient is reduced.

[0003]

2. Description of the Related Art As a conventional cylinder dryer,
For example, the one shown in FIG. 3 was used. This is achieved by providing a steam supply port 4 and a supply passage 6 to the cylinder dryer 1 rotating via the rotary joint 2 to connect the steam supply pipe 3 and discharging the drain generated inside the dryer 1. Pipes 7 and 8 are provided and connected to the discharge passage 5, and a steam trap 32 is attached downstream of the discharge passage 5. The steam supplied from the steam supply pipe 3 heats an object to be heated. Thus, the condensate is condensed inside the dryer 1 to form a drain. The drain can be discharged to the outside through the discharge pipes 7 and 8, the discharge passage 5, and the steam trap 32.

[0004]

SUMMARY OF THE INVENTION In the above prior art,
There is a problem that the drain cannot be reliably discharged by the steam trap 32 and the drain stays inside the dryer 1. This is because the fluid flowing from the drain discharge pipes 7 and 8 to the steam trap 32 is not only drain, but also
In order to reach the steam trap 32 parts by mixing steam,
Steam trap 32 despite the presence of drain
Is closed, and drain cannot be reliably discharged.

[0005] The steam trap is an automatic valve which opens when a drain flows in and automatically discharges the drain to the outside, and closes when steam flows in to prevent the steam from leaking to the outside. If steam flows into the steam trap 32 while the drain is present on the dryer 1 side, the steam trap 32 closes and the drain on the dryer 1 side cannot be discharged. It is. The fact that the steam trap closes due to the inflow of steam while the drain is present is called a steam locking phenomenon of the steam trap.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a cylinder dryer capable of preventing a steam locking phenomenon and quickly discharging drain generated inside the dryer.

[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. Connected and provided with a drain discharge pipe that discharges the drain generated inside the dryer to the outside.A valve that opens and closes according to the rotation angle of the drain discharge pipe is attached to the drain discharge pipe, and the valve is connected to the drain discharge pipe. The valve closes when the rotation is above the rotation and opens when the rotation is below the rotation, and is connected to the steam supply port via an ejector to the steam supply pipe, and is a substantially hermetic drain reservoir that communicates with the drain discharge pipe. The part is disposed outside the dryer, and a communication path is provided to communicate the upper part of the drain reservoir with the suction chamber of the ejector.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An on-off valve, which closes when the drain discharge pipe is rotating upward and opens when the drain discharge pipe is downward, is attached to the drain discharge pipe, so that the drain discharge pipe and the drain reservoir can be drained. Only when the discharge pipe is rotating downward, it communicates via the open / close valve which is opened. On the other hand, since the drain inside the dryer is accumulated at the lower bottom of the dryer due to its gravity, when the drain discharge pipe is positioned below the rotation, only the drain flows into the drain discharge pipe and communicates with the drain reservoir. As a result, only the drain flows into the drain reservoir.

[0009] Although steam exists above the dryer,
When the drain discharge pipe is rotating upward, the steam does not flow into the drain reservoir by closing the on-off valve.
Accordingly, only the drain exists between the drain discharge pipe and the drain reservoir, and the drain inside the dryer can be reliably discharged to the outside without causing the steam locking phenomenon.

Since the upper part of the drain reservoir communicates with the suction chamber of the ejector through the communication passage, the re-evaporated vapor of the drain generated in the drain reservoir is sucked into the ejector. 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 to the inside of the dryer. As described above, by suctioning the re-evaporated vapor in the drain reservoir by the ejector, a large pressure difference is generated between the pressure in the dryer and the pressure in the drain reservoir, and the drain in the dryer flows down to the drain reservoir immediately. can do.

[0011]

FIG. 1 shows a partial cross-sectional view of a cylinder dryer according to the present invention. A steam supply pipe 3 is connected to a horizontally cylindrical cylinder dryer 1 via a rotary joint 2.
And a drain discharge passage 5 are provided. The steam supply pipe 3 is connected to a steam source (not shown) via an ejector 9. Steam supply pipe 3
Communicates with the inside of the dryer 1 via the steam supply port 4 in the rotary joint 2 and the supply passage 6. The drain discharge pipes 7 and 8 are connected to the discharge passage 5 through the communication passages 10 and 11.
Connect with Although the drain discharge pipes 7 and 8 and the dryer 1 rotate continuously up and down around the rotary joint 2, the steam supply pipe 3 and the drain discharge passage 5 are fixed and do not rotate.

Valves 12 and 13 that open and close according to the rotation angle are attached to the drain discharge pipes 7 and 8. Valves 12, 13
2 is shown in FIG. On-off valves 12, 13 shown in FIG.
The valve opens or closes when the cylinder dryer 1 rotates up and down to a predetermined angle. The lower opening / closing valve 13 in FIG. 1 will be described with reference to FIG. The lower inlet 14 of the on-off valve 13 communicates with the inner wall surface side of the dryer 1 of the drain discharge pipe 8, and the upper outlet 15 is connected to the communication passage 11 of the rotary joint 2. Between the inlet 14 and the outlet 15, a valve body 16 and a valve seat 17 made of steel balls and a cylindrical weight 18 as a mass body are respectively arranged.

The valve element 16 is disposed by being urged toward the valve seat 17 by a conical coil spring 19. Valve hole 2 in the center of valve seat 17
0, the valve body 16 is unseated and a valve hole 20 is opened as shown in FIG.
When the seat 6 is seated on the valve seat 17, the inlet 14 and the outlet 15 are shut off.

A cylindrical weight 18 is disposed above the valve seat 17 in a free state. Adjustment screws 21 and 22 that determine the lower end position and the rolling position of the weight 18 are attached to the lower part of the weight 18. If the adjusting screws 21 and 22 are further screwed toward the center side from the state shown in FIG. 2, the lower end position of the weight 18 is raised, and the rolling position angle of the weight 18 can be reduced as described later. is there. The lower end position of the weight 18 and the rolling position angle can be adjusted up and down or large or small by changing the mounting position of the adjusting screws 21 and 22 in addition to adjusting the tightening amounts of the adjusting screws 21 and 22. it can. The inlet 14 and the outlet 15 communicate with each other via a space 23 on the outer periphery of the weight 18.

In the state shown in FIG. 2, the weight 18 contacts the adjusting screws 21 and 22 at the lower end position and also contacts the spherical valve element 16, and the gravity of the valve element 16 causes the coil spring 19 to rotate.
The opening 14 and the outlet 15 of the on-off valve 13 communicate with each other, and the lower portion of the dryer 1 and the drain discharge passage 5 shown in FIG. 1 shows a state in which the drain in 1 flows into the drain reservoir 25.

When the on-off valve 13 gradually tilts counterclockwise from the state shown in FIG. 2, that is, when the cylinder dryer 1 shown in FIG. When the inclination of the on-off valve 13 exceeds about 45 degrees from the vertical in FIG.
Does not act on the valve body 16, the valve body 16 is urged toward the valve seat 17 by the spring force of the coil spring 19 to close the valve hole 20 and shut off the inlet 14 and the outlet 15.

Once the valve body 16 is shut off, the valve body 16 is kept closed, and the on-off valve 13 is further rotated in the counterclockwise direction so that
Beyond 80 and 270 degrees, the remaining 45 degrees position, ie 31
When the position exceeds 5 degrees, the weight 18 rolls toward the inlet 14 with the tip of the adjusting screw 22 as a fulcrum, and the gravity causes the valve body 16 to be separated from the valve seat 17, and the inlet 14 and the outlet 15 again
To communicate.

The on-off valve 12 at the top of the dryer 1 of FIG.
1 is attached by rotating the state shown in FIG. 2 by 180 degrees, the valve is closed at the position of FIG. 1, and the dryer 1 is rotated to open and close the valve at a position of plus / minus 45 degrees centering vertically downward. Is what you do.

The drain discharge passage 5 communicates with the drain reservoir 25. The drain reservoir 25 is substantially closed and communicates with the suction chamber 27 of the ejector 9 through the communication passage 26 from above.
A steam trap 32 is connected below the drain reservoir 25. The communication path 26 and the outlet side of the steam trap 32 are connected to each other through a pipe 28 and a valve 33. The pipe 28 and the valve 33 are for forcibly removing a part of the vapor re-evaporated in the drain reservoir 25 to the outlet side of the steam trap 32.

When a heated object (not shown) located on the outer surface of the cylinder dryer 1 is heated with steam, the dryer 1 is rotated up and down around the rotary joint 2 while a predetermined pressure is applied from the steam supply pipe 3 and the ejector 9. Alternatively, steam at a temperature is supplied into the dryer 1. The vapor deprived of heat in the dryer 1 is condensed to form a drain, which accumulates at the inner bottom of the dryer 1. On the other hand, since the on-off valve 13 is open in a range of plus / minus 45 degrees centered on the lower vertical direction, the drain in the dryer 1 passes through the communication passage 11 and the drain discharge passage 5 within this angular position. , To the drain reservoir 25, and further to the outside from the steam trap 32. In this case, the other on-off valve 12 keeps the valve closed.

When the dryer 1 further rotates, the on-off valve 13
When the angle exceeds 45 degrees, the on-off valve 13 closes to stop the drain discharge, and the dryer 1
This prevents the inside vapor from flowing into the drain reservoir 25 from the discharge passage 5. As the dryer 1 continues to rotate, the on-off valve 12 replaces the on-off valve 13 and opens downward to open, thereby discharging only the drain in the dryer 1 from the drain reservoir 25 and the steam trap 32 to the outside. As described above, the on / off valves 12 and 13 alternately repeat the on / off valves, so that only the drain can be caused to flow down to the drain reservoir 25 in order to discharge the inside of the dryer 1.

The drain reaching the drain reservoir 25 is partially re-evaporated, but is sucked into the ejector 9 from the communication passage 26 and supplied to the dryer 1 again. When the re-evaporated vapor is sucked, the pressure in the drain reservoir 25 becomes lower than the pressure in the dryer 1, and the drain in the dryer 1 immediately flows down into the drain reservoir 25.

The drain in the drain reservoir 25 is discharged to the outside through the steam trap 32. The steam is not mixed into the steam trap 32, and the drain is discharged without generating the steam locking phenomenon. can do.

In the present embodiment, the drain discharge pipes 7, 8
And two on-off valves 12 and 13 are provided. However, depending on the type of the cylinder dryer, one or two or more can be used.

[0025]

As described above, in the cylinder dryer according to the present invention, since only the drain can flow from the drain discharge pipe and flow down to the drain reservoir, a steam locking phenomenon does not occur and the cylinder is generated inside the dryer. The drain thus drained can be reliably discharged to the outside.

Further, by suctioning the re-evaporated vapor generated in the drain reservoir by the ejector, a pressure difference between the inside of the dryer and the interior of the drain reservoir can be secured, and the drain inside the dryer flows into the drain reservoir. It can flow down more quickly, and the drain does not stay 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.

FIG. 2 is a cross-sectional view of the on-off valve in FIG.

FIG. 3 is a partial cross-sectional configuration diagram of a cylinder dryer showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder dryer 2 Rotary joint part 3 Steam supply pipe 4 Steam supply port 5 Drain discharge passage 7, 8 Drain discharge pipe 9 Ejector 12, 13 Open / close valve 14 Inlet 15 Outlet 16 Valve body 17 Valve seat 18 Weight 21, 22 Adjustment screw 25 Drain reservoir 32 Steam trap

Claims (1)

[Claims] 1. A drain 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 drain discharge pipe for discharging drain generated inside the dryer to the outside is provided. In such a device, a valve that opens and closes in accordance with the rotation angle of the drain discharge pipe is attached to the drain discharge pipe, and is closed when the valve is above the rotation of the drain discharge pipe, and is opened when the valve is below the rotation. At the same time, the steam supply pipe is connected to the steam supply port via an ejector, and a substantially sealed drain reservoir communicating with the drain discharge pipe is arranged outside the dryer, and the upper part of the drain reservoir and the ejector are connected to the drain reservoir. A cylinder dryer provided with a communication passage communicating with the suction chamber.