DE10059806B4 - tempering - Google Patents

Abstract

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 an 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) at the bottom and an outlet (12) at the bottom for the gravitational discharge of the refrigerant / oil mixture and the evaporator (8 ) having.

Description

The invention relates to a Temperature control device with a container for liquid to be temperature controlled as well as with a heater and a cooler and with container connections for one external temperature control circuit.

With such temperature control devices can the bath fluid a lower flash point than the maximum working temperature exhibit. This can form, for example, a silicone oil tempering with an increase in Temperature above ignite their flash point.

To solve this problem it is out of the DE 40 14 435 A1 State of the art to shield the liquid to be tempered 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 is connected via a thermally poorly conductive hose line. This expansion vessel can be provided with temperature monitoring and also with additional cooling in order to prevent the respective flash point of the liquid in this area, which can be connected to the outside atmosphere, from being exceeded.

For temperature control devices with heating devices and cooling device must for that Care should be taken that the evaporator of the cooling device when heating up no over one on the refrigerant used coordinated temperature increased becomes. The heating zone and the cooling zone are therefore spatially separate from one another arranged separately, so that an improper heating of the evaporator with refrigerant inside is avoided. To switch the heating area and the cooling area switchable from each other separate, a three-way valve is provided. With this you can choose on the cooling circuit or be switched to the heating circuit. Is problematic ensuring that this three-way valve is used for all temperature-controlled applications 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 remains constant in a certain transition period is negatively affected.

Another problem is cleaning such a two-circuit system, because in the individual branches each cleaning liquid or remains of it may remain. This occurs alternately in both circles depending on the switchover of the Three-way valves on. There is thus an increased risk that a subsequently introduced temperature control medium with cleaning liquid or residues thereof is mixed and the properties of this liquid affected. The cleaning liquid, which, for example, is alcohol and boils at around 80 °, leads to commissioning to a gas development which affects the function and also means a hazard.

Bleeding the pump when filling and while the company is involved in these two-circuit systems Three-way valve problematic. In addition, multiple venting devices are required be provided.

Object of the present invention is a temperature control device with heating device and cooling device the one mentioned at the beginning To create a type that is compact in construction, can be used for large temperature ranges and there is still no change even at very high temperatures the heat transfer fluid should be required.

To solve this task, it is proposed that the heater and an evaporator of the cooler together in the container are arranged and that the evaporator has a pipe guide an inlet arranged below and an outlet arranged below for the gravity-related leakage of the refrigerant-oil mixture and draining the Evaporator has.

Through the shared accommodation the cooling device and the heating device in a container becomes the heat exchanger the cooling device co-heated with activated heating device, through the formation of the heat exchanger however, the refrigerant-oil mixture leak and thus the heat exchanger drain. The refrigerant-oil mixture that has flowed downwards thereby escapes the heating area and cannot be damaged. By in one container located cooling device and heater is a compact structure.

The evaporator advantageously has a helical one pipe guide on with an outer spiral and an inner spiral that is approximately vertically and coaxially interlocking are arranged and are connected to one another at the top and the inlet and outlet for refrigerant exhibit.

By the helical or helical, bifilar tube guide of the evaporator with a first section going from the bottom up extends and a second section that runs from top to bottom feed and return at the lowest point, so that when switching to heating mode the refrigerant-oil mixture can drain off.

An advantageous development of Invention provides that between the outer helix and the inner helix of the evaporator one about the Wendel length extending partition is provided that at the lower end of the Outer spiral one approximately tangentially directed inflow point for temperature control medium, on the upper side at least one overflow point to redirect the temperature control medium to the inner coil and one below to a conveyor connected suction point are provided.

The separation of the outer helix and the inner coil of the evaporator allows a guided flow around the heat exchange with temperature control medium, so that despite the arrangement of the refrigerant supply an effective counterflow cooling is possible next to each other in the lower area.

The circular flow around the course of Outside- and inner coil, which is also guided by these, results in a heat transfer contact via a long distance.

It is preferably provided that Adjacent pipe coils of the evaporator with a small distance between them are arranged and that the space in connection with the Partition a helical Duct flow channel forms. The tube turns of the evaporator are thereby also extensively by contacted the temperature control medium, thereby increasing the effective contact surface.

The cylindrical partition wall expediently protrudes the foreign and inner coil of the evaporator above and is there with a radial oriented and at least about the radial width of the outer and inner helix extending, an outer flange and an inner flange having ring plate connected to the overflow point for diverting the tempering medium from the outer helix is provided for the inner coil.

The flow transfer and redirection of the temperature control medium from the upstream exterior spiral to the inner spiral is thus targeted and in a short way.

It is helpful and beneficial if the outside edge of the outer flange about to the inside of the container extends and one or more openings for discharging the temperature control medium from the area of the outer spiral having.

The openings in the outer edge of the outer flange each have a baffle.

Furthermore, the temperature control medium flow around in the temperature control device in the circumferential direction.

By about in the circumferential direction circulating flow the spiral through the tempering medium can be with one or more in this current engaging baffles a flow deflection in a simple manner be made.

It is useful if the inner flange for Introducing the temperature control medium in the area of the inner coil, in Circumferential course has several passage openings.

The through openings can in its cross section according to the local flow pressure be dimensioned and larger than in areas of lower pressure in areas of higher pressure his.

This also contributes to a uniform flow deflection of the temperature medium flowing around in particular in the circumferential direction Outside- in the inner area or from the outer helix to the inner helix.

A preferred embodiment provides that the heating device above the evaporator of the cooling device is arranged. Conveniently, the heating device has an approximately coaxial to the coils of the evaporator arranged heating coil.

Especially in connection with a centrally in the container arranged displacement body, the expediently a passage opening for the Inlet of the conveyor has in this arrangement also in the area of the inner helix an annular gap flow chamber present, the outside through the partition between outside and inner helix and formed on the inside by the outer wall of the cylindrical displacement body is. This also bears with the fact that the temperature control medium is circular along the course of the spiral guided can be.

But there is also the possibility that the heating device is arranged inside the evaporator, especially between the inner coil of the evaporator and the central one Suction. This embodiment allows a short, compact design of the temperature control device and in particular from its container.

Additional refinements of the Invention are listed in the further subclaims.

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

It shows:

1 , a tempering device in half-sided longitudinal section and

2 a side view of an evaporator of a cooling device belonging to the temperature control device.

One in 1 shown temperature control 1 is used to temper a liquid that is conveyed in an external circuit. This external circuit is connected to an inlet connection 2 and to an outlet nozzle 3 the temperature control device 1 connected. A pump is used for conveying 4 , The inflow 2 for the liquid to be tempered is at the bottom of a container 5 in which both a heater 6 with a heating coil 7 as well as the evaporator 8th a cooling device are housed. The evaporator is connected to a refrigeration circuit with a compressor and a condenser via connections on the underside. As good as in 2 recognizable, shows the evaporator 8th a helical or helical pipe guide with an outer spiral 9 and an inner helix arranged within this 10 , The outer spiral 9 and the inner spiral 10 are arranged coaxially to one another and connected to one another at the top. The inflow 11 and the process 12 for the refrigerant are at the lower end of the outer spiral 9 or the inner spiral 10 , That about the inflow 11 been promoted Refrigerant passes through the outer coil 9 to its upper end and is then continued to the inner spiral 10 where it down to expiration 12 to be led.

The inflow 11 and the process 12 are arranged on the underside so that the refrigerant-oil mixture can escape due to gravity and thus the evaporator 8th idles. This is because the evaporator 8th inside of the container 5 where also the heater 6 is housed.

Would refrigerant or residues of it in the evaporator 8th located while using the heater 6 If the liquid to be tempered is heated, for example to 200 ° C., the refrigerant would become unusable because the oil contained in it would be destroyed. With the evaporator empty 8th however, this cannot happen.

How good in 1 recognizable is between the outer helix 9 and the inner coil 10 of the evaporator a partition wall extending over the spiral length 13 provided, which is cylindrical. The partition 13 protrudes above and below the outer and inner helix of the evaporator and has an outer flange on the upper side with a radially oriented and at least over the radial width of the outer and inner helix 14 and an inner flange 15 having ring plate 16 connected.

Within this ring plate 16 there are overflow openings via the medium to be tempered from the outside, where the outer spiral is 9 of the evaporator 8th is on the inside, where the inner spiral is 10 located, can overflow.

Through the partition 13 in connection with the inside of the container 5 an annular space is formed in which the outer spiral 9 located. An annular space is also formed on the inside, through the partition wall on the outside 13 and on the inside by a cylindrical displacement body 17 is limited. This displacement body 17 is centrally located in the container and has a passage opening 18 for the suction port of the circulation pump 4 on. The sinker 17 reduces the intake 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 tempered is at the bottom of the container 5 preferably fed approximately tangentially and then arrives in a circular manner and from the outer helix 9 led to its upper end, where the ring plate 16 located. Both the outer helix 9 as well as the inner spiral 10 serve as flow guides themselves and for this purpose the 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. In the case of the inner helix, too, this flow is on the one hand due to the pipe windings running from top to bottom in the flow direction and on the other hand through the partition 13 or the outside of the sinker 17 , available.

To overflow in a short way from the outer annular gap space in which the outer spiral 9 is in the inner annular gap space, where the inner spiral is 10 specially designed overflow points are provided. These are located in the ring plate 16 ,

How good in 2 recognizable is at least one opening 19 in the outer flange 14 the ring plate 16 intended. A baffle pointing against the flow direction of the medium to be tempered 20 protrudes into this flow and directs it from the outer annular space into the area above the ring plate 16 ,

As already mentioned, the medium to be tempered is used with the circulation pump 4 vice promotes. The pump part 21 this circulation pump 4 is located at the top inside the container 5 and is over a connecting piece 22 with the pump motor located above 23 connected. The pump part has a displacement body 17 centrally penetrating intake manifold, so that the suction point is at the lower end of this displacement body 17 located. The outlet port 3 is located on the side of the pump section 21 ,

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

In the exemplary embodiment, as in 2 recognizable, in the circumferential course of the ring plate inner flange 15 several openings 24 provided that 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. As a result, the inflow into the inner annular gap is evened out. There is also the possibility that one or more of these openings 24 Baffles are arranged to divert the flow into the area of the inner coil 10 to favor. Furthermore, there is also an equalization of the inflow or flow around the inner helix 10 the possibility in the circumferential course of the ring plate inner flange 15 provided through openings 24 in the circumferential direction, starting from the inflow point at the opening 19 , to increase continuously in their clear cross-section, if necessary, or that groups of passage openings with the same clear cross-section are provided in peripheral sections.

It should also be mentioned that the inner edge of the ring plate inner flange 15 about to the outside of the sinker 17 extends so that the inflow of temperature control medium in the area of the inner coil 10 practically exclusively via those in the inner flange 15 provided openings 24 he follows.

The refrigerant supply 11 is at the bottom of the inner spiral 10 provided and accordingly the refrigerant drain 12 at the bottom of the outer helix 9 , The bath fluid flows in. at the bottom of the container 5 approximately in the tangential direction, so that the circumferential flow results. As a result, the temperature control medium first comes into contact with the downstream part of the evaporator, and thus with the relatively warmest area of the evaporator, while the temperature control medium that has already cooled down 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 8th comes into contact. A counterflow cooling with high effectiveness is thereby formed.

The partition 13 between the outer helix 9 and the inner coil 10 of the evaporator 8th extends to the bottom of the container 5 , On the bottom there is a filling opening for the temperature control medium, which is not recognizable in the drawings, on both sides of the partition 13 empties. As a result, during the filling process there is simultaneous filling of the areas on both sides of the partition 13 possible.

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

Above the evaporator 8th is the heating coil in the exemplary embodiment 7 the heater 6 arranged.

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

Claims (20)

Temperature control device ( 1 ) with a container ( 5 ) for liquid to be tempered 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 an evaporator ( 8th ) of the cooling device together in the container ( 5 ) are arranged, and that the evaporator ( 8th ) a pipe guide with an inlet arranged below ( 11 ) and a drain arranged below ( 12 ) for gravity-related leakage of the refrigerant-oil mixture and idling of the evaporator ( 8th ) having. Temperature control device according to claim 1, characterized in that the evaporator ( 8th ) has a helical pipe guide with an outer helix ( 9 ) and an inner spiral ( 10 ), which are arranged approximately vertically and coaxially interlocking and which are connected to one another at the top and have the inlet and outlet for refrigerants on the underside. Temperature control device according to claim 2, characterized in that between the outer coil ( 9 ) and the inner spiral ( 10 ) of the evaporator ( 8th ) a partition that extends approximately over the helix length ( 13 ) it is provided that at the lower end of the outer spiral ( 9 ) an approximately tangentially directed inflow point for the temperature control medium, at least one overflow point on the top for diverting the temperature control medium to the inner coil ( 10 ) and below there is a suction point connected to a conveyor. Temperature control device according to claim 3, characterized in that the cylindrical partition ( 13 ) the outer and inner helix ( 9 . 10 ) of the evaporator ( 8th ) towered above and there with a radially oriented and at least over the radial width of the outer and inner helix ( 9 . 10 ) extending an outer flange ( 14 ) and an inner flange ( 15 ) ring plate ( 16 ) is connected at which the overflow point for diverting the temperature control medium from the outer coil ( 9 ) to the inner spiral ( 10 ) is provided. Temperature control device according to claim 4, characterized in that the outer edge of the Outer flange ( 14 ) approximately to the inside of the container ( 5 ) extends and one or more openings for discharging the temperature control medium from the area of the outer spiral ( 9 ) having. Temperature control device according to claim 5, characterized in that the openings in the outer edge of the outer flange ( 14 ) one baffle each ( 20 ) exhibit. Temperature control device according to one of claims 4 to 6, characterized in that the inner edge of the inner flange ( 15 ) approximately to the outside of one centrally in the container ( 5 ) arranged suction nozzle of the conveying device or a displacement body and one or more openings for introducing the temperature control medium into the area of the inner coil ( 10 ) having. Temperature control device according to one of claims 4 to 7, characterized in that the inner flange ( 15 ) for introducing the temperature control medium into the area of the inner spiral ( 10 ), several openings in the circumference ( 18 ) having. Temperature control device according to claim 8, characterized in that the passage openings ( 18 ) 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. Temperature control device according to one of claims 5 to 9, characterized in that the temperature control medium in the temperature control device flows around in the circumferential direction. Temperature control device according to claim 8, characterized in that the circumferential course of the inner flange ( 15 ) provided through openings ( 18 ) In the circumferential direction, starting from the inflow point, its internal cross-section may increase continuously or that groups of passage openings with the same internal cross-section are provided in peripheral sections. Temperature control device according to one of claims 8 to 11, characterized in that in the circumferential course of the inner flange ( 15 ) provided through openings ( 18 ) Guide surfaces for introducing the temperature control medium through the through openings are arranged. Temperature control device according to one of claims 1 to 12, characterized in that in the container ( 5 ) a sinker ( 17 ) is arranged. Temperature control device according to claim 13, characterized in that the displacement body ( 17 ) centrally in the container ( 5 ) is arranged and has a passage opening for the suction nozzle of the conveyor. Temperature control device according to one of claims 1 to 13, characterized in that the heating device ( 6 ) above the evaporator ( 8th ) the cooling device is arranged. Temperature control device according to claim 15, characterized in that the above the evaporator ( 8th ) the heating device arranged heating device ( 6 ) approximately coaxial to the coils of the evaporator ( 8th ) arranged heating coil ( 7 ) having. Temperature control device according to one of claims 7 to 16, characterized in that the heating device ( 6 ) inside the evaporator ( 8th ) between the inner helix ( 10 ) of the evaporator ( 8th ) and the central suction nozzle is arranged. Temperature control device according to one of claims 3 to 17, characterized in that adjacent tube turns of the evaporator ( 8th ) are arranged at a clear distance from each other and that the space in connection with the partition ( 13 ) forms a helical flow guide channel. Temperature control device according to one of claims 3 to 18, characterized in that the partition ( 13 ) between the outer helix ( 9 ) and the inner spiral ( 10 ) of the evaporator ( 8th ) to the bottom of the container ( 5 ), and that a filling opening for temperature control medium is provided on the bottom, which is on both sides of the partition ( 13 ) flows out. Temperature control device according to one of claims 1 to 19, characterized in that countercurrent cooling with the inner coil ( 10 ) refrigerant inlet and supply of the temperature control medium at the outer helix provided below ( 9 ) is provided below.