FR2565679A1 - METHOD FOR CONTROLLING THE FLOW OF HEATING OR COOLING FLUID IN A HEATED OR COOLED CYLINDER AND CORRESPONDING CYLINDER DEVICE THEREFOR. - Google Patents

Abstract

A) METHOD FOR CONTROLLING THE FLOW OF THE HEATING OR COOLING FLUID IN A CYLINDER LIKELY TO BE HEATED OR COOLED AND CORRESPONDING CYLINDER DEVICE. B) PROCESS CHARACTERIZED IN THAT THE DIRECTION OF FLUID FLOW IS PERIODICALLY REVERSE. THE INVENTION CONCERNS HEATING CYLINDERS FOR THE TEXTILE INDUSTRY.

Description

"A method for controlling the flow of heating or cooling fluid

  cooling in a cylinder likely to be

  heated or cooled, and corresponding cylinder device

ing. "

- _ - -------at

  The invention relates to a method for controlling

  the flow of heating or cooling fluid

  in a cylinder which can be heated or cooled, with a hollow cylinder constituting the periphery

  of the cylinder and against the inner circumference of which cir-

  all the way down, in the direction of the axis, the fluid of

heating or cooling.

  Cylinders that can be heated or cooled are known, which consist of a hollow cylinder, within which a cylindrical discharge structure is arranged so that between the inner periphery of the hollow cylinder constituting the active periphery of the cylinder and this structure of repression, there remains a narrow intermediate space of annular form. This intermediate space is connected by a system of channels

  and appropriate pipelines to a food pipeline

  tation or an evacuation pipe for a

  fluid, so that it crosses the intermediate space

  re in a direction parallel to the axis of a cylinder end at the other end. Temperature control is achieved by controlling the temperature and / or flow rate of the fluid. However, there is always a change in the temperature of the fluid in the flow path and a temperature drop occurs along the cylinder. While this drop in temperature can be reduced by increasing the flow of fluid pumped through the cylinder, it can not be completely eliminated. An increase in flow requires an increase in pumping power. A prolonged period of time is necessary before stationary and uniform temperature conditions

are introduced.

  The object of the invention is to improve the

  form of the temperature distribution in the case

cylinder of this type.

  This object is achieved according to the method described above, characterized in that the direction of the flow

  fluid is reversed periodically.

  With the reversal of the direction of flow, it does not establish a drop of temperature of a single side insofar as one and the same side is constantly the hottest or the coldest. In the case of a cylinder which can be heated, the fluid, after a reversal of the direction of the flow, also has once with its inlet temperature higher on the side by

  colder elsewhere, and it strongly raises the temperature of

  ture. As a result, the average temperature of

  better balanced, which allows for more

  of the cylinder and which guarantees, with relative

  reduced, a sufficiently uniform distribution of

  the temperature over the course of the course.

  The normal case is that, assuming the same flow per unit of time in both directions, the periods are the same in both directions, so that a symmetrical temperature profile with respect to the center of the cylinder is established. However, there are also cases in which a non-symmetric distribution of the 3- -

  heat, for example in the case of unsymmetrical cylinders

  These include on one side a thicker cylinder journal that draws or captures heat on one side or when the web of cloth is deliberately to be treated with a non-symmetrical temperature profile. Such a "non-symmetrical" temperature profile can be obtained in that the periods during which the direction of flow remains unchanged are chosen from

different lengths.

  The concept of the invention with regard to

  the device for implementationIt is represented by a

  positive cylinder with a cylinder capable of being heated or cooled, with a hollow cylinder constituting the active periphery of the cylinder and against the inner periphery of which is provided an axial flow path for a

  heating or cooling fluid, with a

  pump for the circulation of the fluid, with a

  heating or cooling device for heating or cooling the fluid, and with a control device for influencing the flow of the fluid, cylinder device characterized in that the direction of the flow

  fluid can be modified periodically.

  In principle, it would of course also be possible to reverse the direction of flow by means of pumping device. It is however simpler that the direction of flow is likely to be reversed at

means of the control device.

  This can be achieved in that the

  The control system includes a sus-

  able to be operated periodically, the device

  distribution comprises two 3/2-way distributors,

  able to be operated simultaneously, and arranged on

  the lines for supplying the fluid to the cylinder, the dis-

  tributors are distributors actuated pneumatically

  and connected via a common valve.

2565679 '

  4. An exemplary embodiment of the invention

  is shown schematically in the attached drawing.

  This drawing showsj in its upper part, a longitudinal section of a cylinder that can be heated by being traversed by hot water and it shows, in its lower part, the heating and cooling assembly.

corresponding order.

  The cylinder designated as a whole in the drawing by 10 comprises a hollow cylinder 1 with pins 2, 3. A rotational connection head is placed on the journal 2, while on the journal 3

  is reported the drive shaft 5.

  Inside the hollow cylinder 1, is

  carried in the form of a co-axial cylindrical barrel at

  inner circumference of the hollow cylinder 1, a structure of

  6, which provides a narrow space 8

  relative to the inner periphery 7 of the hollow cylinder 1.

  At its end, to the right of the drawing, the structure

  The discharge head 6 is closed by a terminal disk 9 mounted via a pin 39 on the pin 3 of the cylinder. At the other end, the delivery structure 6 is applied to an external shoulder

  of the terminal disk 11 which is fixed inside the cy-

hollow liner 1.

  From the rotating connection head

  4, a tube 12 exits in the center of the cylinder 10 or the delivery structure 6, leads to the terminal disk 9 where it is connected to transverse channels 13, thanks to

  the fluid supplied by the tube 12 can reach

  to the outside via the room

  14 in the intermediate space 8. The intermediate space

  8 has, in the vicinity of the left terminal disc 11, a connection with the chamber 15 from which the

  fluid can be brought back into the connection head

  4 through link channel 16 and 5.-

  channel 17 annularly surrounding the tube 12 in the

ion 2 of the cylinder.

  The rotating connection head 4 is connected to two external supply lines 18, 19, one of which is in communication with the tube 12 and the other with the channel 17. The rotational connection head 4 allows the sealed connection to the fluid of the fixed pipes

18, 19 with the rotary cylinder 10.

  The control device generally designated 20 comprises a source of compressed air 21 which, via a valve 22 which can be controlled electromagnetically, is connectable with the two distributors 3 / 2 which can be actuated pneumatically. In one of the positions of

  the valve 22, the connection is made and the two distributors

  23, 24 are actuated, while in the other position

  the compressed air distribution is closed by the

  valve 22 and the distributors 23, 24 are in their posi-

rest.

  The connections to the distributors 23, 24 are connected to the pipes 18 or 19. The connection b

  distributor 24 is connected via the housing

  25 with the connection c of the distributor 23.

  The connection b of the distributor 23 is connected by the

  intermediate of the pipe 26 with the connection c of the distributor 24. Inside the distributors 23, 24 the connections in the two operating positions are indicated in the drawing by arrows: in one of the operating positions, the connections a and b of each distributor are respectively connected to one another, while in the other operating position

  the connections a and c of each distributor are

related to each other.

  In Line 25, the channeling

  28 which is connected via the ball valve

  6.- 29 at a hot water generator 32. On the pipe

  hot water 28 is arranged a pump.

  The outlet pipe of the hot water generator 32 downstream of the pump 33 is designated 35. It extends downstream of the stop valve 36 at point 38 through the pipe 26. The hot water in the pipe 35 is pushed back in the direction of the arrow. In the operating position where the connections a and b are connected together in the distributors 23, 24, the connection c

  distributor 24 is closed and the hot water arrives at

  from the point 38 via the pipe 26 in the distributor 23 and thence in the supply line 18. The fluid constituted by the hot water then passes through the cylinder 10 according to the drawing and from the straight line to the left. The return fluid arrives, via the channel 17, into the pipe 19

  and through the distributor 24 and the channel

  25, in Line 28, so that it is

if switched back on.

  In the other operating position of the distributor 23, 24, the connections a and c are interconnected and the connection b of the distributor 23 is thus

  closed. At point 38, the fluid can> therefore

  ter only the route through the distributor

  24 and Line 19. It then comes through

  channel 17 in chamber 15 and crosses the cy-

  liner 10 according to the drawing from left to right for

  then return via the transverse channels

  13 and tube 12 in line 18 through

  distributor 23 in line 28.

  Inversion is effected by electrically actuating the valve 22 whose switching frequency can be determined according to the needs. The periods during which the fluid flows in one or the other direction may be equal or different, depending on whether a symmetrical heat input profile is desired or

  asymmetrical with respect to the middle of the cylinder.

7.-

Claims (7)

R E V E N D I C A TION S   1.- Method for controlling the flow of the   heating or cooling fluid in a cylinder   dre able to be heated or cooled, with a hollow cylinder constituting the active periphery of the cylinder and against the inner periphery which circulates throughout,   in the direction of the axis, the heating fluid or   cooling, characterized in that the sense of   the flow of the fluid is reversed periodically.   2. The process according to claim 1, wherein   characterized in that the periods during which the direction of flow remains unchanged are chosen from different lengths. 3.- Cylinder device with a cylinder that can be heated or cooled, with a cylinder   hollow forming the active periphery of the cylinder and   the inner perimeter of which is a path of   for a heating or cooling fluid   with a pump device for the circulation of the   fluid, with a heating or cooling device   for heating or cooling the fluid,   and with a control device to influence the listening   of the fluid, the cylinder device characterized in that the direction of flow of the fluid is to be modified periodically.   4.- Cylinder device according to the claim   3, characterized in that the flow direction can be inverted by means of the control (20).   5.- Cylinder device according to the claim   4, characterized in that the control device   of (20) includes a dispensing device to be operated periodically.   6.- Cylinder device according to the   cation 5, characterized in that the distribution device 8.   two 3/2-way distributors (23, 24),   they can be actuated simultaneously, and arranged to know the pipes (18, 19) for supplying the fluid to the cylinder (10O).   7. A cylinder device according to claim 6, characterized in that the distributors (23, 24)   are pneumatically and   through a common valve (22).