DE102007052145A1 - Heat exchanger for parts of a printing machine - Google Patents

Abstract

Arrangement on a printing machine (1), comprising a process-temperature control device (2), at least one process-line line (5) which connects the process-temperature control device (2) and the printing machine (1), a free-cooler temperature control device (4) provided in addition to the process-temperature control device (2). , wherein the free-cooler temperature control unit (4) is provided in the process fluid line (5) such that it is flowed through by the process means to be cooled.

Description

The The invention relates to an arrangement on a printing press with a Prozessmitteltemperiervorrichtung and a free cooler temperature control unit.

At the Operation of a printing press arises on different components the printing press heat. This applies in addition to printing cylinders also the resources, eg. As used in offset printing Process agents, such as fountain solution and detergent, often over fed to a circulatory system, discharged, processed and used again. The resources of the printing press preferably used at a certain temperature for use. If the operating temperature is above a certain value, This can lead to a deterioration in print quality.

At the Use of fountain solutions is added that these are not insignificant Part of alcohol that can contain at high temperatures undesirable to evaporate quickly. The composition of dampening solution can therefore change at too high a temperature, that it comes to rest outside of a predetermined target range.

printing presses are therefore often equipped with temperature control. These can both for the temperature of the process agent as well as for the temperature control of the functionally essential parts the printing press, in particular the impression cylinder, are used. Tempering will usually mean cooling, however is also quite a warming into consideration, for example in the start-up phase of a printing press.

Of the Operation of appropriate tempering is relatively expensive, in particular because of the energy required, for example, for the operation of a chiller or an electric Heating device is needed.

To reduce the required energy to be used z. B. in the DE 10 2005 015 954 A1 proposed for temperature control of dampening solution to provide the dampening solution circuit with an additional heat exchanger, which communicates with a free-cooler temperature control unit. By free-cooler temperature control device is meant a device that exploits approximately the temperature of the ambient air.

task

Of the present invention is based on the object, an arrangement to create a printing press that allows unnecessary Energy costs to avoid, the arrangement favorable manufacture and operate is.

The The object is achieved by the arrangement according to the main claim solved. Advantageous embodiments are the subject the dependent claims.

One Aspect of the invention relates to an arrangement on a printing press comprising a process-medium tempering device, at least one process-fluid line, which the process agent tempering device and the printing press connects, and in addition to the process agent tempering device provided freecooler temperature control, wherein the Freecooler temperature control unit in the process fluid line it is provided that it depends on the process agent to be cooled is flowed through. With process agents are any fluids referred to, which supplied to the operation of printing machines this be and / or circulated in the printing presses, in particular Dampening water cleaner, gear oil and / or other Fluids used for cooling certain components become. With process agent, however, is no temperature control, such as. As the usually used in refrigerators Refrigerants (eg R407c, R143a, R410a), meant in a separately provided Temperiermittelkreislauf application which is used to cool a process agent becomes. By free-cooler temperature control unit is meant a device that uses about the temperature of the ambient air, to cool the process agent. The objective Arrangement has the advantage that no separate Temperiermittelkreislauf for the free cooler temperature control unit and thus no heat exchanger between such a temperature control circuit and the process agent leading process line needed is. Consequently, the arrangement is cheaper to manufacture and has an increased efficiency. In the maintenance of the Arrangement this has the further advantage that no separate level a temperature control in the free cooler temperature control must be observed. A free cooler temperature control unit can also operate at low cost and, if the free cooler temperature control unit directly from the process agent is flowed through, the efficiency of the temperature improved. If a sufficient temperature difference between Ambient air and process fluid temperature is given, the intended temperature may be alone or at least mostly by exploiting the outside temperature be achieved.

Preferred is an arrangement in which the process fluid line is a return line, which runs from the printing machine to the process temperature tempering device. It is particularly preferred if the return line is part of a process fluid circuit. In the return line of a Circuit, the process temperature is usually the highest, so that a good temperature control can be achieved here. It is also conceivable, however, that the process-fluid line from the process-temperature-tempering device leads to the printing press and is not part of a cycle.

Further is preferred if the arrangement further comprises a blowing device, which is arranged such that the free cooler tempering with an air flow is flowed. This can be at the same Temperature difference between ambient air and process agent larger process medium flow per unit time cooled become.

When Advantageously, an arrangement is further considered, in which the free cooler temperature control can be deactivated is when the temperature of the process agent in the section of Process fluid line, which from the printing press to free-cooler temperature control unit is higher than the air temperature of the air, which used for cooling the free cooler temperature control unit becomes.

Prefers is an arrangement which also has a bypass, by which process means can be conducted past the freecool temperature control unit is.

A Preferred design of such an arrangement further comprises Valve, via which a process medium flow in the Freecooling temperature control unit or the bypass line can be introduced or to the free cooler temperature control unit and the bypass is redistributable.

Prefers is also an arrangement which further comprises a first temperature sensor which is designed and arranged such that over the first temperature sensor, the process temperature can be detected is, wherein the valve and / or the blowing device in dependence the detected process means temperature controlled and / or regulated is.

Advantageous is also an arrangement which further includes a second temperature sensor which is designed and arranged such that over the second temperature sensor the air temperature detectable is, which for the temperature of the free cooler temperature control serves, wherein the valve and / or the blowing device in dependence the detected air temperature is controllable and / or regulated.

A Another preferred embodiment is directed to an arrangement in the free cooler temperature control unit in a room a building is arranged in which the printing press is set up.

Further is preferred if in the arrangement of the free cooler temperature control is arranged outside a building in which the printing press is set up.

Further is conceivable different free-cooler temperature control to provide in different places, the z. At different times of day and / or seasons depending on the respective ambient air temperature can be switched on and / or off.

One Another aspect of the invention relates to an arrangement on a printing press comprising, a process fluid line and a freecooler temperature control device, wherein the free cooler temperature control such in the process fluid line is provided that it from the to be cooled Process fluid is flowed through, and that at the printing press for the of the free cooler temperature control unit to be cooled process fluid stream except the free cooler temperature control unit no additional temperature control devices are provided. With free cooler temperature control unit is in relation to This aspect of the invention means a device that exclusively exploits the free or forced convection of a gas to that Cooling process agent, as well as for the previous aspect of the invention may apply. Such a thing Freecooler temperature control unit therefore has no additional Cooling circuit, via a tempered temperature control causes a heat exchange with the process agent. Furthermore are, as far as conceivable, in relation to this further aspect the invention also with respect to the first aspect of the invention as preferred embodiments described as preferred considered. This aspect is especially beneficial if to everyone conceivable operating time of the printing press the temperature difference between ambient air and the process medium temperature is sufficiently high. In this case, the intended temperature control alone by Exploitation of the outside temperature can be achieved. This is special in areas where year-round a sufficient low outside temperature prevails or if the process medium temperatures, on which the process agent is to cool, sufficient lying high.

In the following, individual particularly preferred embodiments of the invention will be described by way of example. Some of the described embodiments have features that are not necessarily required to practice the present invention, but are generally considered preferred. Thus, embodiments are also considered to be covered by the teaching of the invention, which does not have all the features of the embodiments described below. Equally it is conceivable to have characteristics that are different in relation to each other Embodiments are described to combine selectively with each other.

1 shows a schematic representation of a preferred embodiment of an inventive arrangement.

2 shows a schematic representation of another preferred embodiment of a free cooler temperature control of an inventive arrangement.

3 shows a schematic representation of another preferred embodiment of a free cooler temperature control of an inventive arrangement.

In 1 is a printing press 1 illustrated, to which a Prozeßmitteltemperiervorrichtung 2 in or over a process means circle 7 is connected, which has a flow and a return and which serves for controlling the temperature of the process means in a manner not shown. A second connection between the printing press 1 and the process agent tempering device 2 has a process fluid circuit 3 on, which is also a feed line 6 and a process line line configured as a return line 5 includes and serves to cool the process agent. It is conceivable that the fluids, which the process means circle 7 and the process fluid circuit 3 flow through, different components of the printing press 1 cool. Furthermore, it is conceivable that in the process means circle 7 and the process fluid circuit 3 different fluids are used.

It is also conceivable that the process fluid circuit 3 the supply of one or more cleaning devices and / or one or more fountain solution devices is used and / or used for cooling the impression cylinder.

in this respect It is a widespread arrangement of printing presses with tempering devices.

Furthermore, according to the invention, a freecooler temperature control unit is provided 4 intended. With free cooler temperature control unit 4 With reference to the described embodiments, it is meant a device which exclusively utilizes the ambient air to cool the processing means. For this purpose, the free cooler temperature control 4 preferably an air - having process - heat exchanger, z. B. in the form of an air cooler. It may be sufficient if the heat exchanger is a passive convection heat exchanger. It is also conceivable that ambient air or other gases, such. B. compressed air, be actively blown on cooling elements of the heat exchanger.

In 2 is an embodiment of the free cooler temperature control 4 shown in which a blowing device 41 , preferably an impeller, allows external air to pass over a process agent chamber. It is also conceivable that the blowing device 41 is designed as a suction device, which air z. B. sucks by cooling fins of the heat exchanger.

This process chamber is part of the process fluid circuit 3 , which is flowed through directly from coming from the printing press process means, which subsequently to an additional Prozeßmitteltemperiervorrichtung 2 is forwarded.

Furthermore, a control unit 46 provided by two temperature sensors 44 . 45 the temperature difference between the air temperature and the temperature of the process medium is determined and the blowing device is dependent on this temperature difference 41 controls (on / off and / or speed).

In 3 is still an embodiment of the free cooler temperature control 4 shown in addition to the blowing device 41 a bypass line 43 is provided.

In this particularly preferred embodiment, the process medium may be partially or completely passed through the bypass line, for. B. when the process temperature is above the air temperature. This is a valve 42 provided, which via the control unit 46 is controllable. Depending on the design, the valve can 42 z. B. be designed as a proportional valve, so that the amount of the volume flow is adjustable, or z. B. as a three-way valve, so that a pure switching function is given.

It is also conceivable that the aspect of the bypass 43 without a blowing device 41 is realized.

Furthermore, it is conceivable that further temperature sensor, for. B. in the leading away from the free cooler temperature control line, in addition to one of the described temperature sensor 44 . 55 or alternatively to one or both temperature sensors 44 . 55 be provided.

1

press

2

Prozessmitteltemperiervorrichtung

3

Process medium circuit

4

Free cooler temperature control

41

blower

42

Valve

43

bypass line

44

first temperature sensor

45

second temperature sensor

46

control unit

5

Process medium line

6

feeder

7

Process center circle

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102005015954 A1 [0006]

Claims (11)

Arrangement on a printing machine ( 1 ), a process agent tempering device ( 2 ), at least one process line ( 5 ), which the Prozessmitteltemperiervorrichtung ( 2 ) and the printing machine ( 1 ), and in addition to the process tempering device ( 2 ) provided freecooler temperature control ( 4 ), characterized in that the free-cooler temperature control unit ( 4 ) in the process fluid line ( 5 ) is provided, that it is flowed through by the process agent to be cooled. Arrangement according to claim 1, wherein the process medium line ( 5 ) is a return line, which from the printing machine ( 1 ) to the process agent tempering device ( 2 ) runs. Arrangement according to claim 1 or 2, which further comprises a blowing device ( 41 ), which is arranged such that the free cooler temperature control ( 4 ) can be flowed with an air flow. Arrangement according to one of the preceding claims, wherein the free-cooler temperature control device ( 4 ) is deactivatable if the temperature of the process agent in the section of the process fluid line ( 5 ) generated by the press ( 1 ) to the freecooler temperature control unit ( 4 ), is higher than the air temperature of the air, which for cooling the free cooler temperature control ( 4 ) is used. Arrangement according to one of the preceding claims, which further comprises a bypass ( 43 ), by which process means on the free cooler temperature control unit ( 4 ) is vorbeileitbar. Arrangement according to claim 5, which further comprises a valve ( 42 ), via which a process medium flow into the freecooler temperature control unit ( 4 ) or the bypass ( 43 ) or to the freecooler ( 4 ) and the bypass ( 43 ) is distributable. Arrangement according to claim 6, which further comprises a first temperature sensor ( 44 ) which is designed and arranged such that via the first temperature sensor ( 44 ) the process temperature is detectable, the valve ( 42 ) and / or the blowing device ( 41 ) is controllable and / or controllable in dependence on the detected process agent temperature. Arrangement according to claim 6 or 7, which further comprises a second temperature sensor ( 45 ) which is designed and arranged such that via the second temperature sensor ( 45 ), the air temperature is detectable, which for temperature control of the free cooler temperature control ( 4 ), the valve ( 42 ) and / or the blowing device ( 41 ) is controllable and / or controllable in dependence on the detected air temperature. Arrangement according to one of the preceding claims, in which the free-cooler temperature control device ( 4 ) is arranged in a room of a building in which the printing press ( 1 ) is placed. Arrangement according to one of claims 1 to 8, wherein the free-cooler temperature control device ( 4 ) is arranged outside a building in which the printing press ( 1 ) is placed. Arrangement on a printing machine ( 1 ), a process control line ( 5 ) and a freecooler temperature control unit ( 4 ), characterized in that the free-cooler temperature control unit ( 4 ) in the process fluid line ( 5 ) is provided, that it is flowed through by the process agent to be cooled, and that no additional temperature control are provided on the press for the to be cooled by the free cooler temperature control process fluid except the free cooler temperature control.