DE102012006406B3 - Temperature control system for printing press, has main cooling system, pre-cooling system and printing press supply system that are in heat-exchanging relationship with one another through respective heat exchangers - Google Patents

Abstract

A tempering system (1) for a printing machine (91) comprising a main cooling system (10), a pre-cooling system (20) and a printing machine supply system (30), the main cooling system (10) being controlled by both the pre-cooling system (20) and the printing machine supply system (10). 30) is hydraulically isolated and wherein the pre-cooling system (20) is hydraulically isolated from the printing machine supply system (30), the main cooling system (10) being in heat exchanging relationship with the pre-cooling system (20) via a first heat exchanger (51); 10) is in heat exchanging relationship with the printing machine supply system (30) via a second heat exchanger (52), and wherein the pre-cooling system (20) is in heat exchanging relationship with the printing machine supply system (30) via a third heat exchanger (53) and printing machine (91). with such a tempering system (1).

Description

Field of the invention

The invention relates to a tempering system for a printing press, as well as a printing press with such a tempering.

Background of the invention and prior art

During operation of a printing press, heat is generated on various components of the printing press. This applies in addition to printing cylinders and the resources, eg. For example, the process used in offset printing process, such as fountain solution and detergent, which are often supplied via a circulatory system, removed, processed and reused. The resources of the printing press are preferably used at a certain temperature for use. If the operating temperature is above a certain value, this can lead to a deterioration of the print quality.

Dampening water, which is required for offset printing machines in wet offset printing, is intended to wet the non-printing areas of the printing plate and thus prevent ink acceptance in these areas. Dampening water to reduce the surface tension on a pressure technically favorable range of alcohol content. A common composition of dampening solution is a proportion of more than 80% by volume of water, up to 10% by volume of chemical additives and up to 15% by volume of isopropanol.

The chemical additives are used u. a. the containment of microorganism formation by means of biocides, prevention of corrosion on steel components of the printing machine by means of corrosion inhibitors, etc.

The not insignificant part of alcohol in dampening solution means that the alcohol in the fountain solution can undesirably evaporate quickly at high temperatures. If too much alcohol evaporates, the composition of the dampening solution can change so that it comes to lie outside of a specified target range. In addition, too high an alcohol consumption is unfavorable from an ecological point of view. Dampening water is therefore often cooled more than other fluids used on printing presses. This also applies to components of the printing press that are wetted with fountain solution.

It is therefore known to equip printing machines with dampening water treatment plants and tempering devices. These can ensure a constant composition of the dampening solution and can be used both for the temperature control of the process agent and for the temperature control of the functionally essential parts of the printing press, in particular the printing cylinder. Tempering in this sense will usually mean cooling, but it is also quite a heating of certain components of the printing press into consideration, for example, in the start-up phase of a printing press.

The operation of corresponding tempering is relatively expensive, especially because of the energy required, which is needed for example for the operation of a refrigerator or an electric heater.

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. With free cooler is meant a device that exploits about the temperature of the ambient air, in particular of ambient air outside a production environment, eg. For example, the air outside a production hall outdoors. As a result, the energy required to operate the printing press can already be significantly reduced.

Nevertheless, even with the printing presses known in the prior art, the costs associated with disposal, renewal and temperature control of the processing means remain high, so that even minor further improvements in the process agent supply, in particular the dampening solution supply, make economic sense. The same applies to a reduction of solvent-based cleaning agent. The development in these areas is in full swing, with a variety of approaches to be pursued.

task

The present invention has for its object to provide a tempering and a printing press with a tempering, which allow to avoid unnecessary energy costs and to ensure a desired high print quality, the arrangement is inexpensive to manufacture and operate.

Solution of the task

The object is achieved by the subject matters of the independent claims. Advantageous embodiments are subject of the dependent claims.

A first independent aspect for achieving the object relates to a temperature control system for a A printing machine comprising a main cooling system, a pre-cooling system and a printing machine supply system, the main cooling system being hydraulically isolated from both the pre-cooling system and the printing machine supply system and wherein the pre-cooling system is hydraulically isolated from the printing machine supply system, the main cooling system communicating with the pre-cooling system via a first heat exchanger heat exchanging relationship, wherein the main cooling system is in heat exchanging relationship with the printing machine supply system via a second heat exchanger, and wherein the pre-cooling system is in heat exchanging relationship with the printing machine supply system via a third heat exchanger.

The term "hydraulically isolated" is used in relation to the present invention in the sense that in hydraulically separate systems each other different fluids flow or circulate, which do not mix with each other in the operation of the temperature control system due to the hydraulic separation of the systems. A tempering system for a printing press can also be referred to as a printing press tempering system.

Such a temperature control system can have connections for connecting the temperature control system to other components, in particular to components of a printing press.

Such other components of a printing press may be components of an open dampening solution circuit and / or an internal printing machine supply circuit. Other components may include external components, such as B. external cooling devices, such as. As free coolers, ground coolers, or similar cooling sources. Free coolers can be heat exchangers which use the cool ambient air to cool a cooling fluid.

Connections for connecting the temperature control system to other components can have a flow and a return in pairs. Forerun fluid lines are referred to, in which fluid flows away from the temperature control during operation of the tempering system. As return fluid lines are referred to, in which flows during operation of the tempering fluid to the temperature.

In the temperature control system, the first heat exchanger is provided to dissipate heat from the main cooling system to the pre-cooling system, ie for cooling the main cooling system. The second heat exchanger is intended to dissipate heat from the printing press supply system to the main cooling system, that is, to cool the printing press supply system. Thus, the printing machine supply system can be cooled by means of the main cooling system.

The third heat exchanger is intended to transfer heat from the printing press supply system to the pre-cooling system, thus also to cool the printing press supply system. Thus, the printing press supply system can be cooled by both the pre-cooling system and the main cooling system.

A dampening solution circuit can supply dampening solution to a dampening unit of a damp offset printing press. Such a dampening solution circuit may be formed as an open circuit, is consumed in the dampening solution during operation of the printing press, so that the dampening solution flow promotes a greater dampening solution than the dampening solution return. In this case, a complete dampening solution cycle is present only during operation of the printing press when connections of the temperature control system are connected to the dampening-side connections. The dampening-side connections, lines of the dampening solution circuit and the dampening unit itself need not be part of the temperature control system. According to an embodiment described below, however, the temperature control system may have a dampening solution treatment system which can be connected to a dampening unit.

A printing machine supply circuit denotes a circuit which supplies the printing cylinders of printing units, inking units or dampening units with cooling fluid for internal cooling. Such an inner printing machine supply circuit can be designed as a closed circuit, in which the fluid flow during the printing machine in a printing press flow of the printing machine supply circuit is the same as the fluid flow in the printing press return. The cycle is only closed during operation of the printing press, d. H. when the terminals of the printing press supply system are connected to the printing machine side terminals. The printing machine-side connections and lines of the printing press supply circuit need not be part of the printing press supply system of the tempering system.

The dampening solution circuit and the printing machine supply circuit can be hydraulically connected to each other or hydraulically separated from each other.

The main cooling system may be formed as a conventional thermodynamic refrigeration cycle having one or more compressors and an evaporator.

The compressor or compressors of the main cooling system can be power-controlled compressors. The power-controlled compressors can be connected to a control unit and steered continuously by the control unit to any cooling power within a predetermined power range. The control of the compressor (s) may be in response to various input values being communicated to the control unit. Such input values can, for. B. fluid temperatures that are transmitted from temperature sensors to the control unit. Temperature sensors can be arranged at different points of the tempering system or at points outside the tempering system. Some of the conceivable arrangements of temperature sensors are described below. Other input values may be operating conditions of the printing press and / or operating states of pumps. Pumps can be arranged at different points of the tempering system or at points outside the tempering system. Some of the conceivable arrangements of pumps are described below.

Furthermore, one or more infinitely adjustable valves may be provided in the main cooling system. For example, a continuously variable two-way valve may be arranged in the circulation of the main cooling system before the second heat exchanger. This and / or other provided elsewhere in the main cooling system valves may be connected to a control unit. Such a continuously variable valve can be controlled by the control unit continuously to any open position within a predetermined opening range. The control unit for controlling the valve or valves may be the previously mentioned control unit which also controls the compressor (s) of the main cooling system.

The tempering system can be designed so that the printing machine supply system is cooled in different operating conditions only by the pre-cooling system, only by the main cooling system or in combination by the pre-cooling system and the main cooling system. These operating conditions may be automatically controlled by the control unit based on input signals transmitted to the control unit. Due to this configuration, the cooling requirement of the printing press supply system can be fully or partially covered by the pre-cooling system depending on the available cooling capacity of the pre-cooling system. Energy required to operate the main cooling system can be saved by this design.

The available cooling capacity of the pre-cooling system may vary over time depending on the available cold source (s) in the pre-cooling system. So the pre-cooling z. B. include a free cooler whose cooling capacity depends on the outdoor temperature in the open air. Other cooling sources are also conceivable. These cooling sources can but do not have to be part of the tempering system. If they are not part of the tempering system, the pre-cooling system may include ports for connection to one or more cooling sources, in particular a pre-cooling return port and a pre-cooling flow port.

The use of the pre-cooling system may depend on the minimum temperature of the cooling fluid in the pre-cooling system flowing from a cooling source via a pre-cooling return toward the first and third heat exchangers. The tempering system may be configured to provide either the main cooling system and the printing press supply system, or only the main cooling system, or neither of the two systems of the pre-cooling system, depending on this temperature and the temperature of the cooling fluid to be cooled flowing through the third heat exchanger be cooled. Optionally, in special embodiments, the temperature of the cooling fluid to be cooled flowing through the first heat exchanger in the main cooling system can also be taken into account.

In order to control the cooling of the main cooling system and the printing machine supply system, the first heat exchanger and the third heat exchanger in the pre-cooling system can be arranged parallel to each other. In this case, a Vorkühlungsrücklauf can be divided into a main cooling branch and a press branch, wherein the first heat exchanger is arranged in the main cooling branch and wherein the third heat exchanger is arranged in the press branch and wherein the main cooling branch and the press branch behind the two heat exchangers reunite and open into the pre-cooling flow. In the pre-cooling system, a switch-off and / or continuously controllable circulating pump can be provided which conveys the cooling fluid in the pre-cooling system.

Alternatively or additionally, one or more infinitely adjustable valves can be provided, via which the ratio between the fluid flow in the main cooling branch and the fluid flow in the press branch can be adjusted. For example, a steplessly adjustable two-way valve can be arranged in the press branch. This and / or other provided elsewhere in the main cooling system valves may be connected to a control unit. Such a continuously variable two-way valve can be steplessly controlled by the control unit be driven to any open position within a predetermined opening range. The control unit for controlling the valve or valves may be the previously mentioned control unit which also controls the compressor (s) of the main cooling system.

The print engine supply system may include ports for connecting the print engine supply system to a dampening solution processor. In this case, the temperature control can be provided separately from a dampening solution treatment plant, so that different types of dampening solution treatment plants to connect to the temperature control.

One embodiment relates to the tempering system described above, wherein the tempering system has a dampening solution processing system which is connected to the printing press supply system.

The print engine supply system may further include ports for connecting the print engine supply system to print engine side components of a print engine supply circuit.

In the operating state of the temperature control system, in which the temperature control system is connected to a printing press, the dampening solution preparation system is part of a dampening solution circuit. The dampening solution processing system can be fluidly connected to the printing press supply system. A fluidic connection means that there is a flow connection between the printing machine supply system and the dampening solution treatment system, so that the same fluid can flow in both components.

In the operating state of the temperature control system, in which the temperature control system is connected to a printing machine and the printing machine supply system is fluidically connected to the printing machine side components of the printing machine supply circuit, a circuit is formed, wherein fluid can circulate in the printing machine supply circuit. This circuit may be designed as an open circuit, if there is a fluidic connection with the dampening solution treatment plant. Also conceivable is a design as a closed circuit, in particular if the fountain solution treatment plant is hydraulically separated from the printing press supply system, as will be described below.

A further embodiment relates to one of the temperature control systems described above, wherein the dampening solution processing plant is hydraulically separated from the printing machine supply system, and wherein the dampening solution processing plant is in heat exchanging relationship with the printing machine supply circuit via a fourth heat exchanger,

The term fountain solution treatment plant refers to a device for the treatment of dampening solution. As a fountain solution, a fluid is referred to, which is used in dampening a damp-offset printing machine to moisten the printing cylinder. Moisturizer is usually made up of water and other components, such as. As alcohol and / or various additives together. A dampening solution treatment plant can have a dampening solution tank in which ready-to-use dampening solution is stored. Furthermore, the dampening solution treatment plant devices for the treatment of the dampening solution, ie for setting the desired composition, and devices for cleaning the dampening solution, such. As filter systems, separators, or the like. The dampening solution preparation system can have connections for connection to a dampening unit of a printing press, in particular a dampening system feed and a dampening unit return.

To control the temperature of the dampening solution in the dampening solution tank, fountain solution can be removed from the fountain solution tank via a pipe system, passed through the fourth heat exchanger and then returned to the dampening solution tank. To clean the dampening solution in the dampening solution tank, dampening water can be removed from the dampening solution tank via another line system, passed through a cleaning system and then returned to the dampening solution tank. Alternatively or additionally, a cleaning system may be provided in the line to the fourth heat exchanger. To supply a dampening unit with fountain solution, dampening water can be removed from the dampening solution tank via another line system and fed to the dampening unit. Excess fountain solution, which is not consumed during operation of the printing press, can be returned directly or via a cleaning device in the fountain solution tank.

The fourth heat exchanger is intended to transfer heat from the dampening solution treatment plant to the printing machine supply circuit. So the fountain solution can be tempered to a desired low temperature. The heat of the dampening solution preparation system discharged to the printing machine supply circuit during operation of the printing press can then be removed from the temperature control system via the main cooling system and / or via the pre-cooling system, as described above.

Accordingly, the dampening solution treatment system can be indirectly cooled both by the pre-cooling system and by the main cooling system.

The tempering system can be designed so that the printing machine supply system can be cooled in different operating states only by the pre-cooling system, only by the main cooling system or in combination by the pre-cooling system and the main cooling system. Due to this configuration, the cooling requirement of the printing press supply system can be fully or partially covered by the pre-cooling system depending on the available cooling capacity of the pre-cooling system. Energy required to operate the main cooling system can be saved. The available cooling capacity of the pre-cooling system may depend on the outdoor temperature when using a free cooler.

Due to the hydraulic separation of dampening solution preparation system and printing machine supply system different fluids can be used in the two hydraulically separated circuits. The respective fluids which are used in the different circuits of the temperature control system can be optimally matched to the respective temperature range in which the respective circuit is operated.

A further embodiment relates to one of the tempering systems described above, wherein the printing press supply system comprises a supply return line and a supply flow line, wherein the supply return line extends from a supply return port to a pressure-machine supply-side input of the second heat exchanger, wherein the supply flow line from a pressure-machine supply-side outlet of the second heat exchanger up to a supply flow connection extends, wherein the third heat exchanger is arranged in the supply return line and wherein the fourth heat exchanger is arranged in the supply flow line.

Thus, it can be ensured that cooling fluid in the printing machine supply system, which was cooled in the third heat exchanger, is first conducted into the fourth heat exchanger and can thus be used for cooling the dampening water, which requires cooling to the lowest temperature level. Subsequently, the cooling fluid in the supply flow line can be further promoted in the direction of the printing press to stand there for the temperature of components with a higher temperature level available.

Yet another embodiment relates to one of the temperature control systems described above, wherein the supply return line and the supply flow line are connected to each other via two parallel connecting lines, wherein the first of these connecting lines in the flow direction branches off behind the fourth heat exchanger and opens between the third heat exchanger and the second heat exchanger in the supply return line and wherein the second of these connecting lines branches off from the supply return line in the flow direction between the third heat exchanger and the junction of the first connecting line and opens in the flow direction behind the branch of the first connecting line in the supply flow line.

So it can be ensured that cooling fluid in the printing machine supply system, which was cooled in the third heat exchanger and passed into the fourth heat exchanger can be promoted either in the supply flow line in the direction of the printing press or via the first connecting line back towards the supply return line.

A further embodiment relates to one of the temperature control systems described above, wherein in the printing machine supply system one or more adjustable valves are provided, via which at least the volume flow in the first connecting line is adjustable so that the ratio between the volume flow in the first connecting line and the volume flow in the second heat exchanger can take any given value within a certain range of ratios.

The ratio range can be z. B. between 0 and 1 lie. Such a valve may, for. B. be designed as a continuously adjustable three-way valve. Such an adjustable three-way valve can be arranged at the branch of the first connecting line from the supply flow line and / or at the junction in the first connecting line in the supply return line. Alternatively, other types of adjustable valves (eg, multiple adjustable two-way valves) may be disposed in the supply flow line and / or in the first connection line and or in the supply return line to provide comparable adjustment options. One or more such infinitely adjustable valves may or may be connected to a control unit and be controlled by the control unit continuously to an arbitrary open position within a predetermined opening range. This control unit may be the previously mentioned control unit, which also or the compressors of the Main cooling system and / or the valves in the main cooling system controls.

About these valves can be adjusted whether the cooling fluid in the printing machine supply system, which was cooled in the third heat exchanger and initially passed into the fourth heat exchanger is completely, partially or not promoted in the supply flow line in the direction of the printing press, or if this cooling fluid completely, partially or is not conveyed back to the supply return line via the first connecting line.

Although the fluid lines of the printing machine supply system according to this embodiment are hydraulically connected to each other, two completely separate fluid circuits can be generated during operation in an extreme position of the valve (eg the continuously variable three-way valve). In this extreme position, cooling fluid can circulate completely back to the second heat exchanger along an internal printing machine supply circuit from the second heat exchanger to the fourth heat exchanger and from the fourth heat exchanger. In an external printing machine supply circuit formed in this extreme position, cooling fluid can circulate from the third heat exchanger into the printing press and from the printing press back to the third heat exchanger. In another extreme position, cooling fluid which has been cooled in the second heat exchanger is passed through the fourth heat exchanger and, in the further course, is conveyed on to the printing press via the supply flow line. Subsequently, the entire flow of refrigerant fluid coming from the printing press can be fed via the supply return line first to the third heat exchanger and then back to the second heat exchanger. In a valve position between these extreme positions, a cold fluid flow coming from the fourth heat exchanger can be split at the branch of the first connecting line into a first partial flow and a second partial flow, wherein the first partial flow is led back through the first connecting line directly to the second heat exchanger and wherein the second partial flow continues in the supply flow line in the direction of the printing press. Conversely, a fluid flow coming from the third heat exchanger can be divided at the branch of the second connection line, wherein a part is conveyed through the second connection line directly in the direction of the supply flow line and via this to the printing machine and wherein the other part mixes with the flow from the first connection line and is conveyed in the direction of the second heat exchanger.

• – im Versorgungsrücklaufstrang in Strömungsrichtung hinter der Einmündung der ersten Verbindungsleitung in den Versorgungsrücklaufstrang oder
• – im Versorgungsvorlaufstrang vor der Abzweigung der ersten Verbindungsleitung

angeordnet ist.Another embodiment relates to one of the temperature control systems described above, wherein in the printing machine supply system, a first feed pump is provided which either

• - In the supply return line in the flow direction behind the junction of the first connecting line in the supply return line or
• - In the supply flow line before the branch of the first connection line

is arranged.

The first delivery pump may be a fluid pump with constant power consumption. Such a pump can produce a constant flow rate. This has the advantage that such a pump can be optimized for a constant delivery, so that it consumes less energy in the optimized range than z. B. variable capacity pumps with variable capacity.

• – im Versorgungsrücklaufstrang in Strömungsrichtung vor der Abzweigung der zweiten Verbindungsleitung oder
• – in den der zweiten Verbindungsleitung oder
• – im Versorgungsvorlaufstrang hinter der Einmündung der ersten Verbindungsleitung

angeordnet ist.A further embodiment relates to one of the temperature control systems described above, wherein in the printing machine supply system, a second feed pump is provided which either

• - In the supply return line in the flow direction before the branch of the second connecting line or
• - in the second connecting line or
• - In the supply flow line behind the junction of the first connecting line

is arranged.

The second delivery pump can be designed as a performance-controlled pumps with variable delivery. Such a power-controlled second delivery pump may be connected to a control unit and be steered continuously by the control unit to an arbitrary cooling capacity within a predetermined power range. This control unit may be the previously mentioned control unit, which also controls the compressor (s) of the main cooling system and / or adjustable valves in the main cooling system and / or adjustable valves of the printing press supply system.

• – die Kühlleistung des Hauptkühlsystems und/oder
• – die erste Förderpumpe und/oder
• – die zweite Förderpumpe und/oder
• – die ein oder mehreren einstellbaren Ventile im Druckmaschinenversorgungssystem

auf vorgegebene Werte einstellt.A further embodiment relates to one of the temperature control systems described above, wherein the tempering system further comprises a control device which is in signal communication with components of the tempering and is designed such that it automatically based on actual states of components of the tempering

• - The cooling capacity of the main cooling system and / or
• - The first pump and / or
• - The second pump and / or
• - The one or more adjustable valves in the printing press supply system

to preset values.

The control of the cooling capacity of the main cooling system can be done via a control of the compressor (s) and / or and / or via a control of adjustable valves in the main cooling system. The control of said components can be carried out in dependence on various input values, which are transmitted to the control unit. Such input values can, for. B. fluid temperatures that are transmitted from temperature sensors to the control unit. Temperature sensors can be arranged at different points of the tempering system or at points outside the tempering system. Some of the conceivable arrangements of temperature sensors are z. B. in the supply return line upstream of the third heat exchanger and / or in the supply flow line behind the junction of the second connecting line and / or in the pre-cooling system in Vorkühlungsrücklauf before the division of the main cooling branch and the printing press branch. Other jobs are also possible.

Other input values may be operating conditions of the printing machine and / or operating states of pumps and / or opening positions of valves. Pumps whose operating states are forwarded to the control unit can be arranged in particular at the points already described, but also at other points of the temperature control system and / or at points outside the temperature control system.

A second aspect for achieving the object relates to a printing press with a temperature control system according to one of the embodiments described above.

In the following, various embodiments for solving the problem will be described by way of example with reference to the figures. In this case, the individual embodiments described have in part features that are not absolutely necessary in order to carry out the claimed subject matter, but which provide desired properties in certain applications. Thus, embodiments are also to be regarded as falling under the described technical teaching, which does not have all the features of the embodiments described below. Further, to avoid unnecessary repetition, certain features will be mentioned only with respect to each of the embodiments described below. It should be noted that the individual embodiments should therefore be considered not only in isolation but also in a synopsis. Based on this synopsis, those skilled in the art will recognize that individual embodiments may also be modified by incorporating one or more features of other embodiments. It should be understood that a systematic combination of the individual embodiments with single or multiple features described with respect to other embodiments may be desirable and useful, and therefore should be considered and also understood to be encompassed by the description.

Brief description of the drawings

1 shows an embodiment of a tempering in a schematic representation.

2 shows the schematic representation 1 in which the main components of the system are shown schematically.

3 shows a section 1 ,

Detailed description of the drawing

1 and 2 show an embodiment of a tempering 1 in a schematic representation. It will be in 2 the main components of the Temerier system 1 summarized.

2 shows a section 1 , wherein a third heat exchanger 53 and a fourth heat exchanger 54 to improve clarity in other positions are shown.

The figures show the tempering system 1 for a printing press 91 comprising a main cooling system 10 , a pre-cooling system 20 a printing press supply system 30 , and a fountain solution treatment plant 40 , The illustrated printing machine 91 can be a number of printing towers 92 include, each of which may be provided for printing a color. The printing press 91 can be an off-set printing press. Some or all printing towers 92 may comprise a printing unit with a printing cylinder with a printing plate, a blanket cylinder, an inking unit, a dampening unit and / or other components.

The main cooling system 10 , the pre-cooling system 20 , the printing press supply system 30 , and the fountain solution treatment plant 40 each have pipelines in which cooling fluids can flow. The piping systems are designed so that the fluids in the main cooling system 10 , in the pre-cooling system 20 , in the printing press supply system 30 , and in the dampening solution processing plant 40 are hydraulically or fluidly separated from each other, so that four different fluids can be used, which are not in any operating condition of the tempering 1 mix with each other.

The illustrated embodiment of the tempering 1 includes four heat exchangers 51 . 52 . 53 . 54 , The first heat exchanger 51 allows direct cooling of the main cooling system 10 and the pre-cooling system 20 through the pre-cooling system 20 , The second heat exchanger 52 allows direct cooling of the printing press supply system 30 through the main cooling system 10 , The third heat exchanger 53 allows direct cooling of the printing press supply system 30 through the pre-cooling system 20 , The fourth heat exchanger 54 allows direct cooling of the dampening solution treatment plant 40 through the printing press supply system 30 ,

Because the printing press supply system 30 itself directly through the main cooling system 10 and / or the pre-cooling system 20 can be cooled, in this embodiment, the dampening solution treatment plant 40 due to the heat exchanging connection to the printing press supply system 30 indirectly through the main cooling system 10 and / or the pre-cooling system 20 be cooled.

The illustrated temperature control system 1 can be connected to other components. These are different connections 21 . 22 . 33 . 34 . 42 . 43 shown. The connections can be designed such that the fluid lines can be connected to one another detachably or non-detachably. Detachable connections can be made by screwing or locking adapter.

Shown is a pre-cooling return connection 21 and a pre-cooling flow connection 22 for connection with other components of the pre-cooling system not shown in the figures. Such components may, for. B. include a free cooler.

Also shown is a supply flow connection 33 and a supply return port 34 for the connection of not shown in the figures to be tempered components of a printing press 1 , such as B. the pressure rollers of a printing unit.

Also shown is a dampening system supply connection 43 and a dampening system return port 44 For connection to one or more dampening units. Here are the dampening system supply connection 43 and the dampening system return connection 44 at the dampening solution processing plant 40 intended. In another embodiment, the dampening unit supply connection and / or the dampening system return connection 44 directly to the fourth heat exchanger 54 be connected, for. B. when the dampening solution treatment plant 40 is switched serially into a fountain solution circulation.

The connection of other components is also conceivable.

In one to a printing press 91 connected state, therefore, the printing machine supply system 30 Be part of a printing press supply circuit and one on the dampening system supply connection 43 and the dampening system return connection 44 connected fountain solution treatment plant 40 may be part of a dampening solution supply or a dampening solution circuit.

The illustrated main cooling system 10 is designed as a thermodynamic cooling circuit, which in the illustrated embodiment, two compressors 11 . 12 and an evaporator.

The illustrated compressors 11 . 12 the main cooling system are power-controlled compressors, which can be connected via a signal connection to a control unit and can be steered continuously by the control unit to any cooling power within a predetermined power range.

In addition, in the main cooling system is an adjustable two-way valve 14 intended. The two-way valve 14 can be carried out as an energy-less expansion valve, via which the pressure and / or the flow in front of the evaporator is adjustable without the expansion valve is in signal communication with the control unit and is controlled by this. The setting can be temperature-dependent, z. B. based on a temperature which is determined via a temperature sensor behind the evaporator, wherein the temperature sensor can be connected directly to the energy-less expansion valve. In another embodiment, a controllable two-way valve 14 be provided that is in signal communication with the control unit and is automatically controlled by this based on a control algorithm.

The first heat exchanger 51 and the third heat exchanger 53 which the pre-cooling system 20 with the main cooling system 10 and the printing press supply system 30 are in the pre-cooling system 20 arranged parallel to each other.

This shares a Vorkühlungsrücklauf 23 into a main cooling branch 25 and a printing press branch 26 on, with the first heat exchanger 51 in the main cooling branch 25 is arranged and wherein the third heat exchanger 53 in the printing press branch 26 is arranged. The main cooling branch 25 and the printing press branch 26 unite behind the two heat exchangers 51 and 53 again and flow into the Vorkühlungsvorlauf 24 ,

In addition, in the illustrated embodiment in the press branch a continuously adjustable two-way valve 27 intended. Instead of a continuously adjustable two-way valve 27 can also be provided a clocked two-way valve. About this two-way valve 27 can by the printing press branch 26 flowing fluid flow can be adjusted continuously. An arrangement of a valve at another location of the pre-cooling system is also conceivable. The illustrated two-way valve 27 can also be connected to the control unit and continuously controlled by the control unit to an arbitrary open position within a predetermined opening range.

The control of the power-controlled compressors 11 . 12 in the main cooling system 10 and the two-way valve 27 in the pre-cooling system 20 may be in response to various input values being communicated to the control unit. In the illustrated embodiment, for. B. a return temperature sensor 28 in the pre-cooling return 23 of the pre-cooling system 20 provided, with which the temperature of the refrigerant fluid can be measured, which was cooled in a free cooler of the ambient air. Further, in the illustrated embodiment, there are two temperature sensors 39 in the supply return line 32 and in the supply flow line 31 arranged, which fluid temperatures in the printing press supply system 30 in the area of the connections 33 . 34 of the printing press supply system 30 can forward to a printing press to the control unit.

Other temperature sensors are not shown but z. B. in the dampening water treatment plant 40 be provided. These temperature sensors can also be connected to the control unit.

The illustrated temperature control system 1 is designed so that the printing press supply system 30 in different operating states only by the pre-cooling system 20 , only through the main cooling system 10 or in combination with the pre-cooling system 20 and the main cooling system 10 can be cooled. The control unit is designed such that these operating states are automatically controlled by the control unit based on input signals which are transmitted to the control unit. An alternative or additional manual control may also be provided in other embodiments.

One embodiment relates to the tempering system described above 1 , where the tempering system 1 a fountain solution treatment plant 40 that with the printing machine supply system 30 connected is.

The printing press supply system 30 may also terminals for connection of the printing press supply system 30 having printing machine-side components of a printing press supply circuit.

The fountain solution treatment plant 40 is in the operating state of the temperature control system 1 in which the temperature control system 1 on a printing machine 91 is connected, part of a dampening solution supply or a dampening solution circuit.

In the operating state of the temperature control system 1 in which the temperature control system 1 connected to a printing machine and the printing machine supply system is connected to the printing machine side components of the printing machine supply circuit, a circuit is formed, wherein fluid can circulate in the printing machine supply circuit. This circuit may be designed as an open circuit, if there is a fluidic connection with the dampening solution treatment plant. Also conceivable is a design as a closed circuit, in particular if the fountain solution treatment plant is hydraulically separated from the printing press supply system, as shown in the figures and described below.

The printing press supply system 30 is in 3 shown.

The printing press supply system 30 has a supply return strand 32 and a supply flow line 31 on, wherein the second heat exchanger 12 between supply return line 32 and supply flow line 31 is arranged. The third heat exchanger 53 is in the supply return strand 32 arranged and the fourth heat exchanger 54 is in the supply flow line 31 arranged.

The fluid in the printing press supply system 30 can therefore both directly from the main cooling system 10 as well as directly from the pre-cooling system 20 be cooled. One or more controllable valves and pumps in the press supply system 30 can the fluid flows in the printing press supply system 30 be distributed so that the available cooling capacity of the pre-cooling system 20 can be fully utilized and that both the pump power and the cooling capacity through the main cooling system 30 and thus the consumption of electrical energy in the entire tempering system 1 can be minimized.

These are the supply return strand 32 and the supply flow line 31 by two parallel Verbindungsseitungen 35 . 36 connected with each other.

In the illustrated embodiment, the first connection line branches 35 in the flow direction behind the fourth heat exchanger 54 from the supply flow line 31 and ends between the third heat exchanger 53 and second heat exchanger 52 in the supply return strand 32 , The second connection line 36 branches from the supply return line 32 in the flow direction between the third heat exchanger 53 and the junction of the first connection line 35 and flows in the flow direction behind the junction of the first connecting line 35 into the supply flow line 31 ,

In the illustrated embodiment, at the junction of the first connection line 35 from the supply flow line 31 a continuously adjustable three-way valve 333 provided, over that of the fourth heat exchanger 54 incoming fluid flow to the first connection line 35 and the supply flow line 31 can be distributed. Instead of a continuously adjustable three-way valve 333 can also be provided a clocked three-way valve.

In this case, that of the fourth heat exchanger 54 incoming fluid flow completely into the first connection line 35 or completely in the supply flow line 31 be routed or in any ratio on the two lines 35 . 31 be split.

When the fourth heat exchanger 54 incoming fluid flow completely into the first connection line 35 are managed in the printing press system 30 formed two separate circuits. The first circuit may be referred to as an internal printing machine supply circuit. In this internal printing machine supply circuit, the refrigerant fluid circulates between the second heat exchanger 52 and the fourth heat exchanger 54 , In this valve position, the cooling of the fountain solution is completely through the main cooling system 10 accepted. The refrigerant fluid in the internal printing machine supply circuit is conveyed exclusively by a pump in the internal printing machine supply circuit, which is the first feed pump 37 referred to as. In the illustrated embodiment, the first feed pump 37 in the supply return line 32 between the junction of the first connection line 35 and the second heat exchanger 52 arranged. An arrangement of the first feed pump 37 elsewhere in the internal printing press supply circuit, e.g. B. in the supply flow line 31 before the branch of the first connecting line 35 or at another location that allows circulation of refrigerant fluid in the internal printing machine supply circuit is also conceivable.

The first delivery pump 37 can be provided as a pump, which has a certain predetermined constant flow rate, is always operated in the on state with this flow rate. Alternatively, the first delivery pump 37 be designed as a power-controlled pump. A power-controlled first feed pump 37 has the advantage that the pump power can be adjusted down depending on demand, z. B. depending on the required cooling capacity in the internal printing machine supply circuit. So z. As electrical energy can be saved, especially when the valve 333 is located in a valve positions, in which of the fourth heat exchanger 54 incoming fluid flow completely into the first connection line 35 is routed so that the fluid flows from the internal and the external printing machine supply circuit do not mix with each other.

The second cycle in the printing press supply system 30 may be referred to as an external printing machine supply circuit because it circulates cryogenic fluid in a circuit caused by the connection of components of the printing press 91 is formed, which are connected to the temperature control and therefore in relation to the tempering 1 can be referred to as external components. In the valve position in which of the fourth heat exchanger 54 incoming fluid flow completely into the first connection line 35 This is also done by the press 91 Coming cold fluid completely through the third heat exchanger 53 and from there back to the printing press 91 promoted.

In the illustrated embodiment, the external printing machine supply circuit has a second delivery pump 38 on that in the supply flow line 31 behind the junction of the first connecting line 35 is arranged. The second pump 38 but can also be provided at other locations of the external printing machine supply circuit, z. B. in the supply return line 32 in the flow direction before the branch of the second connecting line 36 or in the second connection line 36 or in external components of the external printing machine supply circuit, which form part of the printing press 91 could be.

The illustrated second delivery pump 38 is designed as a power-controlled pump with variable capacity and is connected to the control unit, not shown, on which also the compressors 11 . 12 of the main cooling system 10 , the adjustable valves 14 . 27 . 333 in the main cooling system 10 , in the pre-cooling system 20 and in the printing press supply system 30 are connected.

In the valve positions of the three-way valve 333 in the printing press supply system 30 in which of the fourth heat exchanger 54 incoming fluid flow is not completely in the first connection line 35 is directed, the fluid streams from the internal and the external printing machine supply circuit can mix with each other.

The three-way valve 333 in the printing press supply circuit 30 can be controlled by the control unit continuously to an arbitrary open position within a predetermined opening range or to a specific opening stroke. Also the power controlled second pump 38 in the printing press supply circuit 30 can be controlled by the control unit.

LIST OF REFERENCE NUMBERS

1

Temperature System

10

Main cooling system

11

compressor

12

compressor

14

Two-way valve

20

pre-cooling

21

Vorkühlungsrücklaufanschluss

22

Vorkühlungsvorlaufanschluss

23

Vorkühlungsrücklauf

24

Vorkühlungsvorlauf

25

Main cooling branch

26

Druckmaschinen branch

27

adjustable two-way valve

28

Return temperature sensor

30

Druckmaschinen supply system

31

Supply flow line

32

Supply return line

33

Supply flow connection

34

Supply return connection

35

first connection line

36

second connection line

37

first delivery pump

38

second feed pump

39

temperature sensor

333

Three-way valve

40

Dampening medium treatment system

43

Dampening the flow connection

44

Dampening return connection

51

first heat exchanger

52

second heat exchanger

53

third heat exchanger

54

fourth heat exchanger

91

press

92

printing tower

Claims (10)

Tempering system ( 1 ) for a printing press ( 91 ), comprising a main cooling system ( 10 ), a pre-cooling system ( 20 ) and a printing press supply system ( 30 ), the main cooling system ( 10 ), both from the pre-cooling system ( 20 ) as well as the printing press supply system ( 30 ) is hydraulically isolated and wherein the pre-cooling system ( 20 ) from the printing press supply system ( 30 ) is hydraulically separated, the main cooling system ( 10 ) with the pre-cooling system ( 20 ) via a first heat exchanger ( 51 ) is in heat exchanging relationship, the main cooling system ( 10 ) with the printing machine supply system ( 30 ) via a second heat exchanger ( 52 ) is in heat exchanging relationship, and wherein the pre-cooling system ( 20 ) with the printing machine supply system ( 30 ) via a third heat exchanger ( 53 ) is in heat exchanging relationship. Tempering system ( 1 ) according to claim 1, wherein the tempering system ( 1 ) a fountain solution treatment plant ( 40 ) associated with the printing press supply system ( 30 ) connected is. Tempering system ( 1 ) according to claim 2, wherein the dampening solution treatment plant ( 40 ) from the printing press supply system ( 30 ) is hydraulically separated, and wherein the dampening solution treatment plant ( 40 ) with the printing machine supply circuit via a fourth heat exchanger ( 54 ) is in heat exchanging relationship. Tempering system ( 1 ) according to claim 3, wherein the printing press supply system ( 30 ) a supply return strand ( 32 ) and a supply flow line ( 31 ), wherein the supply return strand ( 32 ) from the supply return connection ( 34 ) to the pressure-machine supply-side input of the second heat exchanger ( 52 ), wherein the supply flow line ( 31 ) from the printing machine supply-side outlet of the second heat exchanger ( 52 ) to the supply supply connection ( 33 ), wherein the third heat exchanger ( 53 ) in the supply return strand ( 32 ) and wherein the fourth heat exchanger ( 54 ) in the supply flow line ( 31 ) is arranged. Tempering system ( 1 ) according to claim 4, wherein the supply return strand ( 32 ) and the supply flow line ( 31 ) via two parallel connecting lines ( 35 . 36 ), the first of these connecting lines ( 35 ) in the flow direction behind the fourth heat exchanger ( 54 ) and between the third heat exchanger ( 53 ) and second heat exchanger ( 52 ) in the supply return strand ( 32 ) and opens the second of these connecting lines ( 36 ) from the supply return line ( 32 ) in the flow direction between the third heat exchanger ( 53 ) and the junction of the first connection line ( 35 ) and in the flow direction behind the branch of the first connecting line ( 35 ) into the supply flow line ( 31 ) opens. Tempering system ( 1 ) according to claim 5, wherein in the printing machine supply system ( 30 ) one or more adjustable valves are provided, via which at least the volume flow (Vs1) in the first connecting line is adjustable so that the ratio (Vs1 / Vs2) between the volume flow (Vs1) in the first connecting line and the volume flow (Vs2) in second heat exchanger ( 52 ) can take any given value within a certain range of ratios. Tempering system ( 1 ) according to one of claims 5 to 6, wherein in the printing press supply system ( 30 ) a first delivery pump ( 37 ) which is either - in the supply return line ( 32 ) in the flow direction behind the junction of the first connecting line in the supply return strand ( 32 ) or - in the supply flow line ( 31 ) is arranged in front of the branch of the first connecting line. Tempering system ( 1 ) according to one of claims 5 to 7, wherein in the printing press supply system ( 30 ) a second delivery pump ( 38 ) which is either - in the supply return line ( 32 ) in the flow direction before the branch of the second connecting line or - in the second connecting line or - in the supply flow line ( 31 ) is arranged behind the junction of the first connecting line. Tempering system ( 1 ) according to one of claims 5 to 7, wherein the tempering system ( 1 ) further comprises a control device which is connected to components of the temperature control system ( 1 ) is in signal connection and is designed such that it is based on actual states of components of the tempering ( 1 ) automatically - the cooling capacity of the main cooling system ( 10 ) and / or - the first delivery pump ( 37 ) and / or - the second delivery pump ( 38 ) and / or - at least one adjustable valve in the printing press supply system ( 30 ) sets to certain values. Printing machine ( 91 ) with a temperature control system ( 1 ) according to one of claims 1 to 9.

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