EP0693375B1 - Temperature regulating device for a printing press - Google Patents

Description

The invention relates to a printing machine temperature control device for at least two of each other separated liquids in a printing press, especially fountain solution for wet offset printing and Cooling water of an offset printing machine according to the preamble of claim 1.

A printing machine temperature control device of this type is known from EP-A-0 553 447. With the known Device is a refrigeration device with a Refrigerant circuit provided in two to each other parallel circuit branches is divided. The one Circular branch extends through a first one Heat exchanger and the other circuit branch extends through a second heat exchanger. By the first Heat exchanger also extends a fountain solution circuit for the purpose of exchanging thermal energy with one Circuit branch of the refrigerant circuit. By the second heat exchanger extends Cooling water circuit for the purpose of heat energy exchange with the other circuit branch of the refrigerant circuit. Of the Cooling water circuit is used to cool the cylinders Printing machine either by flowing through the concerned cylinder or by heat energy exchange in a cooling water-air heat exchanger and bubbles from the Cooling water cooled air on the relevant cylinder. Such printing press cylinders can be printing plate cylinders, Blanket cylinders, impression cylinders, rollers and rollers of dampening units and inking units or other cylinders or rolls of the printing press.

The fountain solution is used in offset printing, the non-printing Set the pressure plate of the To dampen the printing plate cylinder so that it does not Accept printing ink.

A printing press often has one when it starts Temperature which is below its optimal Operating temperature. In this case she needs Printing machine not cooled at the beginning of its operating time become. However, it is desirable that the press, especially their cylinders, rollers and rollers, if possible quickly reach the optimal operating temperature. The Cooling water can also serve as "heating water" to the Printing machine as quickly as possible to its optimal Warm operating temperature. As part of this Description also mean "cooling water" depending on the application "Heating water" and "cylinder" are any type of cylinder, Rolling and rolling a printing machine, especially one Offset printing machine.

The object of the invention is to be solved simple and inexpensive way of quick heating Cylinders of a printing press to operating temperature to reach.

This object is achieved according to the invention by the characterizing features of claim 1 solved.

The invention has the following advantages: only one only cooling generator and a single control device to control a single liquid circuit, preferably the fountain solution circuit, needed to Printing press quickly to the optimal operating temperature to warm up and after reaching this optimal Operating temperature at a higher rising temperature prevent.

The second liquid is preferably chilled water or cooling water for cooling rollers of the printing press, however, this liquid can also be used to cool others Parts of the printing press can be used, for example for cooling lubricating oil.

Fig. 1

schematisch eine Druckmaschinen-Temperierungsvorrichtung nach der Erfindung für zwei voneinander getrennte Flüssigkeiten, insbesondere Feuchtwasser für den Naß-Offsetdruck und Kühlwasser einer Offsetdruckmaschine,

Fig. 2

eine weitere Ausführungsform einer Druckmaschinen-Temperierungsvorrichtung nach der Erfindung für mindestens zwei voneinander getrennte Flüssigkeiten, insbesondere Feuchtwasser für den Naß-Offsetdruck und Kühlwasser einer Offsetdruckmaschine.

Further features of the invention are contained in the subclaims. The invention is described below with reference to the drawings using preferred embodiments as examples. Show in the drawings

Fig. 1

schematically a printing machine temperature control device according to the invention for two liquids separated from each other, in particular fountain solution for wet offset printing and cooling water of an offset printing machine,

Fig. 2

a further embodiment of a printing press temperature control device according to the invention for at least two separate liquids, in particular fountain solution for wet offset printing and cooling water of an offset printing press.

The printing press temperature control device shown in FIG. 1 of the drawings contains a first Liquid circuit 2 for a first liquid 4 in Form of fountain solution. The first liquid circuit 2 contains one after the other in the direction of flow Fountain solution tank 6, in which the fountain solution is prepared, the fountain solution 4 from the Fountain solution tank 6 in the first liquid circuit 2 pump 8, one by a second Heat exchanger 10 leading heat exchanger section 12 and one leading through a first heat exchanger 14 Heat exchanger section 16, of which the first Liquid circuit 2 back into the fountain solution tank 6 leads back. A refrigeration unit 18 has one Refrigerant circuit 20 with a heat exchanger section 22, which extends through the first heat exchanger 14 extends and in exchange of thermal energy with the Fountain 4 stands, which by the Heat exchanger section 16 of the first Liquid circuit 2 flows.

The first liquid circuit 2 points in the flow path between the second heat exchanger 10 and the first Heat exchanger 14 has a fountain solution 24, from which part of the dampening water 4 by means of rollers 25 and 26 the printing plate 28 of a printing plate cylinder 30 one offset printing machine not shown in detail is transmitted with which either wet offset printing or Dry offset printing can be printed. With wet offset printing the fountain solution flows in the above described way through the fountain solution 24 and after the fountain solution 24 by gravity or promoted by another pump 36 through the first heat exchanger 14 back into the fountain solution tank 6. In the flow path of the first liquid circuit 2 is between the second heat exchanger 10 and the dampening water pan 24 a changeover valve 32, by means of which the fountain solution 4 optionally in the manner described by the Fountain tank 24 passed or via one to it parallel flow line 34 to the dampening water pan 24 over from the second heat exchanger to the first heat exchanger 14 can be directed. With wet offset printing it will Fountain water passed through the fountain water pan 24. At the Dry offset printing is the fountain solution 4 on the Fountain tank 24 over the parallel Flow line 34 from the second heat exchanger 10 to the first Heat exchanger 14 passed.

The printing machine temperature control device of FIG. 1 also includes a second liquid circuit 42 for Cooling water 44. The second liquid circuit 42 or Cooling water circuit 42 contains in the direction of flow successively a coolant tank 46, a pump 48, a heat exchanger section 50, which is in the second heat exchanger 10 is located therein and in Heat energy exchange with the first liquid in the form of the dampening water 4 of the first liquid circuit 2 stands, a further heat exchanger section 52 and one leading him back into the cooling water tank 46 Line section 54. The further heat exchanger section 52 of the second liquid circuit 42 is used for Heat energy exchange, especially for cooling a Printing machine means. This printing machine means can Cooling air 55, which is in a cooling water-air heat exchanger tempered by the cooling water, in particular cooled and by a fan 56 to be cooled Printing press part, in particular a cylinder 58, a Roll or roll of the printing machine is blown. This Cylinder, roller or roller can be one Printing plate cylinder, a blanket cylinder, a Impression cylinder, a roll or roller one Dampening unit or an inking unit of the printing press. According to a modified embodiment, the further heat exchanger section 52 within the cylinder 58 or the roller or roller concerned, to cool the roll shell, as shown in Fig. 1 by a dashed line section 60 is indicated schematically.

A heater core 66 includes a heater 68 in Form of an electric heating coil or one Hot water circuit and one with this heating medium 68 in Heat energy exchange standing and therefore from the heating medium 68 heatable heat exchanger fluid channel 70. The Heat exchanger fluid channel 70 is parallel to Heat exchanger section 50 of the second Liquid circuit 42 to the second Fluid circuit connected in terms of flow. In the upstream of the heat exchanger fluid channel 70 and located upstream of the heat exchanger section 50 There is an adjustable connection point Distribution device 72, with which the second Liquid, in this case the cooling water 44, if necessary in whole or in part by the Heat exchanger section 50 in the second heat exchanger 10 and / or through the heat exchanger fluid channel 70 of the Heater heat exchanger 66 can be passed. With the Distribution device 72, the cooling water 44 depending on Required optionally only through the heat exchanger section 50 of the second heat exchanger 10 are passed while the Cooling water supply to the heating heat exchanger 66 closed is, or only through the heat exchanger fluid channel 70 of the Heater heat exchanger 66 are conducted during the Cooling water supply to the heat exchanger section 50 in the second Heat exchanger 10 is blocked, or the cooling water 44 in an adjustable ratio divided by the Heat exchanger section 50 in the second heat exchanger 10 and simultaneously through the heat exchanger fluid channel 70 in Heater heat exchangers 66 flow. This allows the Temperature of the cooling water in the second liquid circuit 42 can be regulated and if necessary increased as much be that the cooling water acts as "heating water" and the Press parts 52,54,56,58 warms instead of cools.

The distributor device 72 can be manual or according to the preferred embodiment of Fig. 1 by a electric or mechanical actuator 74 set by an electronic control device 76 depending on an adjustable temperature setpoint and depending on one or more Actual temperature values of the cooling water 44 in the second Cooling water circuit 42 and / or the fountain solution 4 in first liquid circuit 2 and / or of temperatures of parts of the printing press, for example of the Temperature of one of the printing press cylinders 30 and / or 58 be managed. The electronic control device 76 contains a computer in which the functions of the Printing press temperature control device and Printing press are stored so that these functions from Computer controlled run automatically. The electronic Control device 76 is connected via electrical lines 80 a temperature sensor 82 of the first Liquid circuit 2, via electrical lines 84 with a temperature sensor 86 of the second Liquid circuit 42 each for measuring the actual temperature value, and via electrical lines 88 with the Actuator 74 of controllable distributor device 72 connected to it depending on the actual temperature values and one or more target temperature values to regulate in the computer of the control device 76 are saved. The temperature setpoint or the Temperature setpoints are preferably by hand or in Depends on the functions of the printing press automatically changeable.

The invention provides the following, among others Operating options: If the printing press at Operation start colder than the optimal operating temperature is, then by means of the heating heat exchanger 66 Cooling water can be heated. Furthermore, this can be heated Cooling water 44 can be used as a heating medium, which the Printing press cylinder 58 warmed. If so Operating temperature of the printing press above the optimal Operating temperature has risen, can by means of Refrigerator 18 in the first heat exchanger 14 that Fountain water 4 cooled and as a cooling medium in the second Heat exchanger 10 the cooling water of the second Cool the liquid circuit 42. Both at the Heating phase as well as the cooling phase is not additional temperature transfer agent required, but rather the dampening water 4 and the cooling water 44 each as a heat exchange medium in the second Heat exchanger 10 used. During the warming up phase the heating means 68 of the heating heat exchanger 66 turned on and the cooling water 44 at least flows partially through the heater core 66. During the The heating phase is switched off by the refrigeration generator 18. At the cooling phase, the cooling generator 18 is switched on and the heating heat exchanger 66 is switched off. "Heater heat exchanger 66 turned off" means that at least heating means 68 is turned off, even if the cooling water 44 except through the heat exchanger section 50 in the second heat exchanger 10 also through the heat exchanger fluid channel 70 of the heating heat exchanger 66 can flow. By dividing the flow of the cooling water 44 during the cooling phase on the two parallel partial flows, which through the heat exchanger fluid channel 70 and Heat exchanger section 50 in the second heat exchanger 10 given, the temperature of the cooling water 44th be set because the cooling water 44 so much more Refrigerator 18 via the fountain solution 4 in the second Heat exchanger 10 is cooled, the more cooling water 44 through the second heat exchanger 10 flows, but all the less is cooled, the more cooling water 44 by the switched off heat exchanger 66 is passed instead of through the second heat exchanger 10.

The distributor device 72 is preferably a So-called zone valve, as it is in building heating systems is used.

In the embodiment shown in FIG. 2, parts are which functionally correspond to parts of FIG. 1 with provided the same reference numbers and are no longer in Described in detail.

2 is the Refrigerant circuit 20 on two parallel refrigerant branches Split 20/1 and 20/2. Which has a parallel branch 20/1 one passed through the first heat exchanger 14 Heat exchanger section 22/2. The other parallel branch 20/2 has a through a second heat exchanger 10/2 passed through the heat exchanger section 22/3. Of the Heat exchanger section 50 of the second Liquid circuit 42 is through this second Passed heat exchanger 10/2 and therein with the Heat exchanger section 22/3 of the refrigerant circuit 20 in heat energy exchange. The heater core 66 is that passed through the second heat exchanger 10/2 Heat exchanger section 50 of the second Liquid circuit 42 connected in parallel. The upstream sides of the heat exchanger section 50 of the second liquid circuit 42 and the heat exchanger fluid channel 70 of the heating heat exchanger 66 are on the Distribution device 72 interconnected so that Cooling water 44 completely or partially by the second Heat exchanger 10/2 and / or through the heating heat exchanger 66 can be directed as above has been described with reference to FIG. 1. With the 2 can only the cooling water 44 of the second liquid circuit 42 from the heating heat exchanger 66 be heated.

As shown in FIG. 2, the refrigeration device 18 has one after the other in the direction of flow Refrigerant compressor 92, a condenser 94, a Refrigerant collector 96, a circuit branch point 97, of which the two parallel branches 20/1 and 20/2 lead away. The two parallel branches 20/1 and 20/2 contain one after each branch point 97 Refrigerant expansion valve 98 and are over a Collection point 100 reconnected. The Collection point 100 is via an evaporation pressure regulator 102 to the suction side 104 of the refrigerant compressor 92 connected in terms of flow. Of course you can other types of refrigerators 18 can be used.

The arrows next to the liquid lines indicate the Flow direction of the liquid in it and the arrows in addition to the electrical lines 80,84,88 give the electrical signal direction in it.

Claims (7)

1. A printing machine temperature regulating device for at least two separate liquids (4, 44) in a printing machine, in particular moistening solution (4) for wet offset printing and cooling water (44) for an offset printing machine, comprising a first liquid circuit (2) for the first liquid (4), a second liquid circuit (42) for the second liquid (44), a pump (8) and a heat exchanger (14) in the first liquid circuit (2), a second pump (48) and a second heat exchanger (10, 10/2) in the second liquid circuit (42), and a refrigeration means (18), which comprises at least one refrigerant circuit (20) for cooling the two liquids (4, 44) by means of the two heat exchangers (14, 10, 10/2),
   characterised in that

   a heating heat exchanger (66) is provided which comprises a heating means (68) and a heat exchanger fluid duct (70) heatable thereby, in that the heat exchanger fluid duct (70) is connected for flow to the second liquid circuit (42) in parallel with the heat exchange portion (50) of the second liquid circuit (42), in that at the junction positioned upstream of the heat exchanger fluid duct (70) and upstream of the heat exchange portion (50) of the second liquid circuit (42) there is located an adjustable distributor device (72), with which the second liquid (44) of the second liquid circuit (42) may if necessary be conveyed wholly or in part through the heat exchange portion (50) of the second liquid circuit (42) and/or through the heat exchanger fluid duct (70) of the heating heat exchanger (66).
2. A printing machine temperature regulating device according to claim 1,
   characterised in that

   the distributor device (72) is regulated automatically by an electronic regulating device (76) in accordance with a desired temperature value and at least one actual temperature value, in particular an actual temperature value of the second liquid circuit (42) and/or an actual temperature value of the first liquid circuit (2).
3. A printing machine temperature regulating device according to either one of the preceding claims,
   characterised in that

   the first liquid (4) consists of moistening solution for application to the printing plate of the plate cylinder (30) for wet offset printing and the second liquid (44) in the second liquid circuit (42) consists of cooling water for cooling at least one part (58) of the offset printing machine.
4. A printing machine temperature regulating device according to any one of the preceding claims,
   characterised in that

   the first liquid circuit (2) of the first liquid (4) extends through the first heat exchanger (14) and through the second heat exchanger (10), in that a refrigerant circuit (20) of the refrigeration means (18) extends through the first heat exchanger (14) and there exchanges thermal energy with the first liquid (4) of the first liquid circuit (2), in that the first liquid circuit (2) also extends through the second heat exchanger (10), the first liquid (4) in the second heat exchanger (10) thereby exchanging thermal energy with the second liquid (44) of the second liquid circuit (42), which likewise passes through the second heat exchanger (10), such that coldness from the refrigeration means (18) may be transmitted by the first liquid circuit (2) to the second liquid circuit (42) or heat from the heating heat exchanger (66) may be transmitted by the second liquid circuit (42) to the first liquid circuit (2).
5. A printing machine temperature regulating device according to claim 4,
   characterised in that,

   in the direction of flow of the first liquid (4), the second heat exchanger (10) is arranged first in the first liquid circuit (2), followed by the first heat exchanger (14).
6. A printing machine temperature regulating device according to any one of the preceding claims,
   characterised in that

   a reversing valve (32) is located in the flow path of the first liquid circuit (2) between the two heat exchangers (10, 14), by means of which reversing valve (32) the first liquid (4) may be conveyed between these two heat exchangers (10, 14) optionally via a printing machine unit (24, 30) to be treated with the first liquid (4) or past this printing machine unit through a flow medium line (34) parallel thereto directly from one heat exchanger (10) to the other heat exchanger (14).
7. A printing machine temperature regulating device according to any one of claims 1 to 3,
   characterised in that

   the refrigerant circuit (20) of the refrigeration means (18) is conveyed through both heat exchangers (14, 10/2) and exchanges thermal energy in the first heat exchanger (14) with the first liquid (4) of the first liquid circuit (2) and in the second heat exchanger (10/2) with the second liquid (44) of the second liquid circuit (42) respectively.

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