DE10059806A1 - Device for tempering liquids has heater, cooler, tempering container with connections for external tempering circuit and vaporizer for the cooler - Google Patents

Abstract

A heater device (6) and vaporizer (8) for a cooler fit together in a container (5). The vaporizer has tubular feeds with an inlet (11) fitted below and an outlet (12) for gravity-driven discharge of a coolant-oil mixture and for draining the vaporizer off. The cooler and heater can fit in a common container because the design of a heat exchanger lets the coolant-oil mixture run out during the heating operation and consequently the heat exchanger can drain off.

Description

The invention relates to a temperature control device with a Container for liquid to be tempered and with a Heating device and a cooling device and with tank connections for an external temperature control circuit.

With such temperature control devices, the temperature control liquid can a lower flash point than the maximum working temperature exhibit. This can be caused, for example, by a silicone oil Thermal fluid formed with an increase in temperature ignite above its flash point.

To solve this problem it is state of the art that shield the tempering liquid from the ambient air. The thermal expansion of the liquid must be taken into account and appropriate sealing measures must be provided. For example, an expansion vessel is provided, which over a thermally poorly conductive hose line is connected. This expansion vessel can be equipped with a temperature monitor be and also with additional cooling to prevent that the respective flash point of the liquid in this area, the can be in connection with the outside atmosphere, not exceeded  becomes.

For temperature control devices with heating and cooling devices care must be taken that the evaporator of the cooler direction when heating up not over one used Refrigerant-adjusted temperature is increased. The heating zone and the cooling zone is therefore spatially separated from each other, so that an inadmissible heating of the evaporator with it refrigerant is avoided. Around the heating area and a switchable separation of the cooling area from one another Three-way valve provided. With this you can choose the Cooling circuit or switched to the heating circuit. The problem here is that this three-way valve for everyone used, to be tempered media must be suitable and on the other hand, also over the entire working temperature range must work. Another problem is that after a Switching process a mixture of cold and warm tempering medium occurs, so that the temperature in a certain transition period constancy is negatively affected.

Another problem is the cleaning of such a two-circuit System, since in each branch cleaning liquid or remnants of it may remain. This occurs alternately in both Circle depending on the switching of the three-way valve. So that exists an increased risk that a subsequently filled tempering medium is mixed with cleaning fluid or residues thereof and affects the properties of this liquid. The cleaning liquid that is, for example, alcohol and boils at about 80 °, leads to a gas development during commissioning, which the Function impaired and also means a hazard.

Bleeding the pump when filling and during operation is in these two-circuit systems with three-way valve problematic. In addition, multiple venting devices are required be provided.  

The object of the present invention is a temperature control device with heating and cooling device of the type mentioned to create, which is compact in construction, for large temperature ranges is usable and at which nevertheless at very high temperatures no change of the heat transfer fluid should be necessary.

To solve this problem it is proposed that the heating device and the evaporator of the cooler together in the container are arranged and that the evaporator has a pipe guide with below arranged inlet and outlet for gravity-related outlet of refrigerant-oil mixture and to empty the evaporator having.

By accommodating the cooling device and the Heating device in a container is the heat exchanger Cooling device also heated with activated heating device the formation of the heat exchanger can, however, Leak oil mixture and thus the heat exchanger run empty. The This causes the refrigerant-oil mixture to flow downwards the heating area and cannot be damaged.

Through the cooling device located in a container and Heating device is compact.

The evaporator advantageously has a helical shape Pipe guide on with an outer coil and an inner coil that are arranged approximately vertically and coaxially interlocking and which are connected to each other on the top and the and have drain for refrigerant.

Due to the helical or helical bifilar Pipe routing of the evaporator with a first section of bottom up and a second section that goes from the top runs down, there are both inlet and return lowest point, so that when switching to heating mode Refrigerant-oil mixture can drain off.  

An advantageous development of the invention provides that between the outer coil and the inner coil of the evaporator approximate one another over the spiral length extending partition is provided that at the lower end the outer helix is preferably approximately tangential Directed inflow point for temperature control medium, on the top at least one overflow point for diverting the temperature control medium to the inner coil and at the bottom to a conveyor closed suction point are provided.

The separation of the outer coil and the inner coil of the evaporator enables a guided flow around the heat exchange Temperature control medium so that despite the arrangement of the refrigerant supply effective and effective side by side in the lower area Counterflow cooling is possible.

The circular flow around the course of external and Inner spiral, which is also guided by these, gives one Heat transfer contact over a long distance.

It is preferably provided that adjacent pipe turns of the Evaporator are spaced apart and that screw the gap in connection with the partition forms linear flow guide channel. The pipe coils of the evaporator are thereby also extensively influenced by the tempering medium to be contacted and thereby increases the effective contact surface.

The approximately cylindrical partition wall expediently projects above the Outer and inner helix of the evaporator above and there with one radially oriented and at least over the radial width of the Extending outer and inner helix, an outer flange and one Ring plate having an inner flange connected, in which the Overflow point for diverting the temperature control medium from the outside helix to the inner helix is provided.

The flow transfer and redirection of the temperature control medium from The inflow-side outer helix to the inner helix thereby takes place targeted and short way. It is helpful and beneficial  when the outer edge of the ring plate outer flange is approximately to extends to the inside of the container and one or more openings preferably each with a baffle for discharging the in particular in the circumferential direction flowing tempering medium the area of the outer helix.

Due to the circumferential flow around the helix through the tempering medium with one or more in this Flow interfering baffles in a simple way Flow deflection can be made.

It is useful if the inner ring plate flange for introduction of the tempering medium flowing in particular in the circumferential direction in the area of the inner helix, several in the circumferential course Has passage openings, preferably in their cross section are dimensioned according to the local flow pressure and are greater in areas of lower pressure than in areas of higher pressure Pressure. This also contributes to an even flow deflection of the temperature control medium from the outside to the inside or from the outer helix to the inner helix.

A preferred embodiment provides that the heating device is arranged above the evaporator of the cooling device and in particular approximately coaxial to the coils of the evaporator arranged heating coil. Especially in connection with a displacement body arranged centrally in the container, the in particular a passage opening for the suction nozzle for the Has conveyor, is also in this arrangement in the area the inner coil has an annular gap-shaped flow space, the on the outside through the partition between the outer and inner helix and inside through the outer wall of the preferably cylindrical Displacement body is formed. This also helps that the temperature control medium is guided circularly along the spiral course can be.

But there is also the possibility that the heating device  is arranged within the evaporator, in particular between the inner coil of the evaporator and the central suction port. This embodiment enables a short, compact design Temperature control device and in particular of its container.

Additional embodiments of the invention are in the others Subclaims listed.

The following is the invention with its essential details explained in more detail with reference to the drawings.

It shows:

Fig. 1 position a temperature control in half-sided longitudinal section and

Fig. 2 is a side view of an evaporator of a tempering device belonging to the cooling device.

A tempering device 1 shown in Fig. 1 is used for controlling the temperature of a liquid which is converted promotes in an external circuit. This external circuit is connected to an inlet pipe 2 and to an outlet pipe 3 of the temperature control device 1 . A pump 4 is used for conveying. The inlet 2 for the liquid to be tempered is located at the lower end of a container 5 in which both a heating device 6 with a heating coil 7 and the evaporator 8 of a cooling device are accommodated. The evaporator is connected to a refrigeration circuit with a compressor and a condenser via connections on the underside. As can also be clearly seen in FIG. 2, the evaporator 8 has a helical or helical pipe guide with an outer helix 9 and an inner helix 10 arranged within the latter. The outer coil 9 and the inner coil 10 are arranged coaxially to one another and connected to one another at the top. The inlet 11 and the outlet 12 for the refrigerant are located at the lower end of the outer coil 9 and the inner coil 10, respectively. The refrigerant supplied via the inlet 11 passes through the outer coil 9 to its upper end and is then passed on to the inner coil 10 , where it is led down to the outlet 12 .

The inlet 11 and the outlet 12 are arranged on the underside so that the refrigerant-oil mixture can escape downward due to gravity and thus the evaporator 8 runs empty. This is provided because the evaporator 8 is located inside the container 5 , where the heating device 6 is also housed.

If refrigerant or residues thereof were to be found in the evaporator 8 while the liquid to be tempered was heated by means of the heating device 6 , for example to 200 ° C., the refrigerant would become unusable because the oil content contained therein would be destroyed. However, this cannot occur when the evaporator 8 is empty.

As can be clearly seen in FIG. 1, a partition wall 13 extending over the coil length is provided between the external coil 9 and the internal coil 10 of the evaporator and is of cylindrical design. The partition wall 13 projects above and below the outer and inner helix of the evaporator and is connected on the upper side to a radially oriented ring plate 16 which has an outer flange 14 and an inner flange 15 and extends at least over the radial width of the outer and inner helix.

Within this ring plate 16 there are overflow openings through which the medium to be tempered can flow from the outside, where the outer coil 9 of the evaporator 8 is located, to the inside, where the inner coil 10 is located.

Through the partition 13 in connection with the inside of the container 5 , an annular space is formed in which the outer coil 9 be found. An annular space is also formed on the inside, which is delimited on the outside by the dividing wall 13 and on the inside by a cylindrical displacement body 17 . This displacement body 17 is arranged centrally in the container and has a passage opening 18 for the suction port of the circulation pump 4 . The displacement body 17 reduces the receiving volume of the temperature control device, whereby the temperature control dynamics can be improved. In the exemplary embodiment, it also forms part of the internal flow guidance.

The liquid to be temperature-controlled is preferably fed approximately tangentially at the lower end of the container 5 and then passes in a circular manner and is guided by the outer helix 9 to the upper end thereof, where the ring plate 16 is located. Both the outer helix 9 and the inner helix 10 themselves serve as flow guides and for this purpose the respective adjacent tube turns of the evaporator are arranged at a short distance from one another. The space in connection with the partition 13 and the container wall then form a helical flow guide channel. Also in the inner coil, this flow is on the one hand through the pipe windings running there from top to bottom in the flow direction and on the other hand through the partition 13 or the outside of the displacer 17 .

In order to cause an overflow from the outer annular gap space, in which the outer coil 9 is located, into the inner annular gap space, where the inner coil 10 is located, over a short distance, specially designed overflow points are provided. These are located in the ring plate 16 .

As can be clearly seen in FIG. 2, at least one opening 19 is provided in the outer flange 14 of the ring plate 16 . A baffle plate 20 pointing counter to the flow direction of the medium to be tempered projects into this flow and guides it from the outer annular space into the area above the ring plate 16 .

As already mentioned, the medium to be tempered is conveyed by means of the circulation pump 4 . The pump part 21 of this circulation pump 4 is located at the upper end within the container 5 and is connected to the pump motor 23 located above via a connecting piece 22 . The pump part has a displacement body 17 penetrating centrally through the suction body, so that the suction point is at the lower end of this displacement body 17 . The outlet port 3 is located laterally in the area of the pump part 21 .

The tempering medium discharged from the outer annular space above the annular plate 16 continues to have a circular flow and thereby reaches the area of a plurality of openings 24 provided in the inner flange 15 of the annular plate 16 for introduction into the inner annular space and thus the area of the inner coil 10 . A corresponding pressure drop is built up by the suction point of the circulation pump 4 located at the lower end of this inner annular space, so that the temperature-regulating medium flowing around in the circumferential direction flows down along the course of the inner coil 10 and then reaches the suction port of the circulation pump 4 .

In the embodiment, as can be seen in Fig. 2, several through openings 24 are provided in the circumferential course of the ring plate inner flange 15 , which are dimensioned in cross-section accordingly the local flow pressure and are greater in areas of lower pressure than in areas of higher pressure. As a result, the inflow into the inner annular gap is evened out. There is also the possibility that 24 guide surfaces are arranged in one or more of these openings in order to favor the flow diversion into the area of the inner coil 10 . Furthermore, to even out the inflow or flow around the inner coil 10, there is the possibility, in the circumferential direction of the openings 24 provided in the circumferential course of the ring plate inner flange 15 , starting from the inflow point at the opening 19 , to have their internal cross section continuously increased or that Circumferential sections groups of passage openings with the same clear cross section are provided.

It should also be mentioned that the inner edge of the ring plate inner flange 15 extends approximately to the outside of the displacer 17 , so that the inflow of temperature control medium into the area of the inner coil 10 occurs practically exclusively via the openings 24 provided in the inner flange 15 .

The refrigerant inlet 11 is provided at the lower end of the inner coil 10 and, accordingly, the refrigerant outlet 12 at the lower end of the outer coil 9 . The heat transfer liquid flows in at the lower end of the container 5 approximately in the tangential direction, so that the circumferential flow results. As a result, the temperature control medium comes into contact with the part of the evaporator on the flow side, and thus with the relatively warmest area of the evaporator, while the temperature control medium that has already cooled at the end of the flow guide, i.e. at the lower end of the inner coil 10, with the relatively coldest area of the evaporator 8 comes into contact. A counterflow cooling with high effectiveness is thereby formed.

The partition 13 between the outer coil 9 and the inner coil 10 of the evaporator 8 extends to the bottom of the container 5 . At the bottom there is a filling opening for temperature control medium, which cannot be seen in the drawings, and which opens on both sides of the partition 13 . As a result, simultaneous filling of the areas on both sides of the partition 13 is possible during the filling process.

The evaporator 8 with the outer helix 9 and inner helix 10 in connection with the partition 13 and the ring plate 16 arranged on the top and a bottom flange 25 arranged on the underside form, as can be seen in FIG. 1, a compact assembly unit.

In the exemplary embodiment, the heating coil 7 of the heating device 6 is arranged above the evaporator 8 .

The container 5 has an end cover on the upper side, which is inclined somewhat obliquely from the horizontal position and is connected at the highest point to a vent line 26 . The end of this vent line is closed by a valve 27 . The vent line 26 is connected to an annular channel which is located above the pump part 21 and to which the pressure port or outlet port 3 of the circulation pump 4 is also connected. The temperature control medium flows in a circular manner in this area and also reaches the connection area of the ventilation line 26 . In order to ensure that air bubbles actually get into the ventilation line 26 , this has at its lower connection end a ventilation dome 28 which has an enlarged cross section compared to the ventilation line 26 . The cross section is dimensioned so that the air bubbles can be picked up and thereby removed. With a small cross-section, the removal of unwanted air bubbles would be difficult due to surface tensions.

Claims (15)

1. temperature control device ( 1 ) with a container ( 5 ) for liquid to be temperature-controlled and with a heating device ( 6 ) and a cooling device, and with container connections for an external temperature control circuit, characterized in that the heating device ( 6 ) and the evaporator ( 8 ) of the cooling device are arranged together in the container ( 5 ), and that the evaporator ( 8 ) has a pipe guide with an inlet ( 11 ) and outlet ( 12 ) arranged at the bottom for gravity-related leakage of the refrigerant / oil mixture and idling of the evaporator ( 8 ) having. 2. Temperature control device according to claim 1, characterized in that the evaporator ( 8 ) has a helical tube guide with an outer helix ( 9 ) and an inner helix ( 10 ) which are arranged approximately vertically and coaxially interlocking and which are connected on the top and bottom have the inlet and outlet for refrigerant. 3. Temperature control device according to claim 1 or 2, characterized in that between the outer coil ( 9 ) and the inner coil ( 10 ) of the evaporator ( 8 ) an approximately extending over the length of the partition ( 13 ) is provided that at the lower end preferably the outer helix ( 9 ) has an approximately tangentially directed inflow point for the temperature control medium, on the upper side at least one overflow point for diverting the temperature control medium to the inner helix ( 10 ) and below a suction point connected to a conveying device are provided. 4. Temperature control device according to claim 3, characterized in that the approximately cylindrical partition ( 13 ) overhangs the outer and inner helix ( 10 ) of the evaporator ( 8 ) and there with a radially oriented and at least over the radial width of the outer and Inner coil ( 10 ) extending, an outer flange ( 14 ) and an inner flange ( 15 ) on pointing ring plate ( 16 ) is connected, in which the overflow point for diverting the tempering medium from the outer coil ( 9 ) to the inner coil ( 10 ) is provided. 5. Temperature control device according to claim 4, characterized in that the outer edge of the ring plate outer flange ( 14 ) extends approximately to the inside of the container ( 5 ) and one or more openings preferably each with a guide plate ( 20 ) for discharging the in particular Has tempering medium flowing around the circumferential direction from the area of the outer helix ( 9 ). 6. Temperature control device according to claim 4 or 5, characterized in that the inner edge of the ring plate inner flange ( 15 ) extends approximately to the outside of a centrally arranged in the container ( 5 ) arranged suction port of the conveyor or a displacer and one or more openings for introducing of the tempering medium flowing around the circumference, in particular in the region of the inner helix ( 10 ). 7. Temperature control device according to one of claims 4 to 6, characterized in that the ring plate inner flange ( 15 ) for introducing the tempering medium flowing in particular in the circumferential direction into the area of the inner coil ( 10 ), has a plurality of through openings ( 18 ) in the circumferential course, which preferably are dimensioned in their cross-section according to the local flow pressure and are larger in areas of lower pressure than in areas of higher pressure. 8. Temperature control device according to one of claims 4 to 7, characterized in that the through openings ( 18 ) provided in the circumferential course of the ring plate inner flange ( 15 ) in the circumferential direction, starting from the inflow point, increase continuously in their clear cross section, or that groups in circumferential sections of passage openings with the same clear cross section are provided. 9. Temperature control device according to one of claims 4 to 8, characterized in that in the circumferential course of the ring plate inner flange ( 15 ) provided through openings ( 18 ) guide surfaces for introducing the tempering medium through the through openings are arranged. 10. Temperature control device according to one of claims 1 to 9, characterized in that a displacement body ( 17 ) is preferably arranged centrally in the container ( 5 ), which in particular has a passage opening for the suction port of the Förderein direction. 11. Temperature control device according to one of claims 1 to 10, characterized in that the heating device ( 6 ) is arranged above the evaporator ( 8 ) of the cooling device and in particular has an approximately coaxial to the coils of the evaporator ( 8 ) arranged heating coil ( 7 ) , 12. Temperature control device according to one of claims 1 to 11, characterized in that the heating device ( 6 ) is arranged within the evaporator ( 8 ), in particular between the inner coil ( 10 ) of the evaporator ( 8 ) and the central suction nozzle. 13. Temperature control device according to one of claims 1 to 12, characterized in that adjacent tube turns of the evaporator ( 8 ) are arranged at a short distance from one another and that the intermediate space in connection with the partition ( 13 ) forms a helical flow guide channel. 14. Temperature control device according to one of claims 3 to 13, characterized in that the partition ( 13 ) between the outer coil ( 9 ) and the inner coil ( 10 ) of the evaporator ( 8 ) extends to the bottom of the container ( 5 ), and that A filling opening for temperature control medium is provided on the bottom and opens on both sides of the partition ( 13 ). 15. Temperature control device according to one of claims 1 to 14, characterized in that a countercurrent cooling with the inner coil ( 10 ) provided at the bottom of the refrigerant supply and supply of the temperature control medium at the outer coil ( 9 ) is provided below.