DE102014109293B4 - Device for heating a degreasing and / or cleaning system - Google Patents

Abstract

Device (1) for heating a degreasing and / or cleaning system, which comprises a heating cartridge (5), with an outer body (3) and an inner body (4), characterized in that the inner body (4) in the outer body (3) The inner body (4) has a first flow bridge (6) for the escape of steam (9), the inner body (4) has another flow bridge (7) for inflowing medium (8), the flow bridges ( 6, 7) are located in the inner body (4) on essentially opposite sides, the first flow bridge (6) for the escape of steam (9) being larger and / or more permeable than the other flow bridge (7) for the inflow of medium (8) , wherein the flow bridges (6, 7) are openings, the first opening (6) of the inner body (4) being nozzle-shaped for the escape of steam (9).

Description

Technical field

The invention relates to a device according to the preamble of claim 1.

State of the art

In the manufacture of workpieces and metal parts, there is often various soiling of the surface during the manufacturing process, e.g. through fats. The surface of these workpieces and metal parts must therefore be treated with a cleaning medium afterwards for cleaning and degreasing. The cleaning is usually done in cleaning or degreasing baths. These are e.g. around water baths. Furthermore, cleaning can take place in solvent baths and / or by vapor phase cleaning with solvent vapor.

In this context, the DE 33 20 150 A1 pointed out, which discloses a heat transfer device. It consists of a condensation chamber, which is arranged horizontally along a heated object.

For completeness, further on DE 36 44 364 A1 and the WO 03/085345 A1 pointed out, which each disclose a device for heating fluids in storage tanks and transport tubes.

Such a method for vapor phase cleaning and the associated device are for example in the DE 43 29 178 B4 to find. In these baths and devices, the solvent is indirectly heated and, depending on the type of device, evaporated. Heating takes place indirectly in order to avoid the risk of explosion or implosion of the solvent used. Mostly water that is in a pipe is heated by an electrical heating cartridge, which is also attached to the inside of the pipe. The heated water in turn releases the thermal energy obtained through the pipe wall to the solvent. As a result, the solvent is heated or evaporated and can be used more effectively for the further cleaning process.

Object of the invention

The object of the invention is to further develop the device for heating a cleaning medium so that a higher transfer of thermal energy from the medium heated in the heating device to the cleaning medium can take place without reducing the security provided by the previous indirect heating , Furthermore, it is an object of the invention to conserve resources or save energy by increasing the efficiency.

Solution of the task

The features of claim 1 lead to achieving the object.

In a typical exemplary embodiment, a device according to the invention is used in a degreasing and / or cleaning system. In particular, the use of the device according to the invention should be included in systems which are used for the surface cleaning of objects, in particular workpieces. Such systems are essentially devices in which the objects are cleaned in the vapor phase of a cleaning medium and / or devices in which the cleaning takes place in a bath from a cleaning medium. The cleaning medium in exemplary embodiments is e.g. around solvents, water and / or water mixed with additives that promote cleaning.

In preferred exemplary embodiments, the device according to the invention is used in systems in which the parts to be cleaned are cleaned and / or degreased in a water bath / solvent bath, an aqueous or solvent-containing solution and / or a vapor phase of the water, the aqueous or solvent-containing solution. “Aqueous solution” or “solvent-containing solution” describes a mixture which consists of water and / or solvent and / or an additive which promotes cleaning and / or degreasing and which preferably achieves a cleaning effect in a liquid phase and / or in the vapor phase.

In a typical embodiment, the device according to the invention is designed as an indirect heat source. By designing the device as indirect heating, direct contact of a heating cartridge, which is responsible for supplying heat, with the medium to be heated can be avoided.

Furthermore, the use of the device according to the invention in any type of heating system should be encompassed as a heat exchanger.

By using a device according to the invention, the cleaning medium is heated indirectly, whereby the risk of explosion or implosion of the cleaning medium can be prevented. Furthermore, the indirect heating can prevent residues from the surfaces of the cleaned Objects are loosened, put them on the heating cartridge and thereby, for example, reduce the heating output, which means that the heating cartridge can be cleaned more easily when the cleaning and / or degreasing system is being serviced, with no particular care being taken of sensitive parts of the heating cartridge.

In a typical exemplary embodiment, the device for heating a cleaning medium in a degreasing and / or cleaning system comprises, in addition to an outer body which is surrounded by the cleaning medium, an inner body and a heating cartridge. In one exemplary embodiment, the outer body and the inner body are designed as tubular bodies which have a round, in particular circular, cross section. In further embodiments, elliptical and / or polygonal cross-sectional shapes of the outer body and / or inner body are possible and are therefore included here.

Starting from the longitudinal axis directed through the center of the device, the inner body is arranged inside the outer body. This creates a space between the inside / inside wall of the outside body and the outside / outside wall of the inside body. The heating cartridge of the device is arranged inside the inner body and is preferably, but not necessarily, in the region of the longitudinal axis of the device. The interior of the inner body as well as parts of the space formed by the outer body and the inner body are partially filled with a medium, preferably a liquid medium. The liquid medium can be made to evaporate by supplying heat, the heat being supplied in a device according to the invention via the heating cartridge. The medium is preferably water and / or a mixture of water and one or more additives. The additives can in particular be substance additives which advantageously influence the heat transfer properties of the medium and / or substance additives which are introduced as anti-wetting agents and / or anti-corrosion agents. The longitudinal axis is the edge of the inner body and / or outer body which has a longer edge than the edge which is tilted by 90 ° to the longitudinal axis. The longitudinal axis regularly runs essentially parallel to an imaginary surface.

The heating cartridge is preferably an electric heating cartridge which converts electrical energy into thermal energy. The heating cartridge is located inside the inner body essentially below the liquid surface of the medium. The heat generated by the heating cartridge heats the medium until it evaporates. In a further embodiment, the heating cartridge can also have an internal burner in which a combustible material is burned in order to provide thermal energy.

The steam generated by the supply of heat escapes through a first flow bridge in the inner body into the space formed by the outer body and the inner body. The first flow bridge in the inner body thus acts as an outlet for the steam. In the intermediate space, the water vapor releases the thermal energy to the outer body and thereby to the cleaning medium surrounding the outer body. The heat condenses and the steam condenses and collects in the gap.

The terms flow bridge and breakthrough are used synonymously in the context of the invention.

In one embodiment, the condensed medium then flows again from the intermediate space into the inner body via another flow bridge in the inner body. The other flow bridge in the inner body thus acts as an inlet for the condensed medium. Both the flow bridge for inflowing and the flow bridge for outflowing the medium preferably correspond to openings in the application. Therefore, the invention also includes the use of a large number of openings as an outlet and / or the use of a large number of openings as an inlet. Furthermore, instead of the breakthroughs, the use of matrix materials, such as high-strength but porous ceramics for the flow bridges, should also be included in the present case.

In one embodiment, the flow bridges are located in the inner body on essentially opposite sides of the liquid surface of the medium. The first flow bridge is located above the liquid surface of the medium that is located in the inner body. As a result, the first flow bridge is located in the area in which the medium can be found as vapor, ie in gaseous form. The other flow bridge is preferably located below the liquid surface of the medium in the inner body and below the liquid surface of the medium, which is located in the intermediate space.

To improve the resulting circulation, the flow bridge, via which the steam flows from the inner body into the intermediate space, is essentially larger or more permeable than the flow bridge, through which the water flows back into the inner body.

In a typical exemplary embodiment, the first flow bridge through which the steam escapes into the intermediate space is a slot-shaped opening, which preferably extends over the entire length of the inner body. Furthermore, the opening through which the steam flows into the intermediate space from the inner body has a preferably nozzle-shaped cross section. This means that the heat transfer from the steam to the outer body can be increased by a higher impact speed.

Although the first flow bridge is preferably slit-shaped, the invention also covers any other forms for the formation of the first flow bridge. Furthermore, the first flow bridge can consist of a large number of openings. According to the invention, the first breakthrough can also be a single breakthrough. This is regardless of the fact that it is referred to as the first breakthrough in the context of the invention.

When steam is condensed on a cooler wall, which corresponds to the inside / inside wall of the outer body in the device, complete wetting occurs on technical surfaces and thus the so-called film condensation. The resulting heat transfer is higher than that of flowing water or flowing medium. As a result, the energy input required to heat the cleaning medium can be reduced.

An even higher heat transfer can be achieved by the so-called droplet condensation. Therefore, the present invention is also intended to encompass the use of anti-wetting agents which are added to the medium in the device. Likewise, a special surface coating on the inside of the outer body, which prevents film condensation, should be included in the present case. In this context, all surfaces working according to the so-called lotus flower effect can also be used.

Furthermore, different shapes of the openings are provided both for the or the plurality of openings through which the medium flows in, and for the or the plurality of openings through which the medium flows out. In particular, slot-shaped and circular openings as flow bridges are conceivable in one embodiment.

In a further embodiment, the device according to the invention has only a first breakthrough. This is preferably located in the area of the inner body in which the medium is in the vapor phase. Through this first breakthrough, the vaporous medium can also flow into the intermediate space of the device in this embodiment. According to the invention, the first breakthrough can also be a single breakthrough.

This is regardless of the fact that it is referred to as the first breakthrough in the context of the invention.

In the intermediate space, the steam then also condenses on the inside / inside wall of the outer body, and the condensate then preferably collects in the intermediate space on a side facing the substrate.

The condensate collected in the intermediate space is then led out of the intermediate space, for example via a condensate return pump and / or via an outlet. The condensed medium can then be passed back into the interior of the inner body and / or pumped.

Furthermore, fresh medium and / or conditioned condensed medium can also be passed and / or pumped into the interior of the inner body instead of the condensed and discharged medium. The condensed medium can be processed, for example, by fresh medium and / or by adding new anti-wetting agent and / or anti-corrosion agent. It is also possible to prepare the medium using additives which have an advantageous effect on the heat transfer properties of the medium.

In a further embodiment, the inner body likewise has only a first opening. In this exemplary embodiment, the condensed medium is not pumped out of the intermediate space of the device, but instead begins to evaporate again due to the thermal energy supplied by the heating cartridge. The thermal energy that leads to the evaporation of the condensed medium in the intermediate space is transferred from the heating cartridge to the medium in the interior of the inner body and from there via the inner body to the condensed medium in the intermediate space. As a result, the condensed medium in the intermediate space on an outer side / outer wall of the inner body is heated to such an extent that it begins to evaporate again.

An arrangement of two or more devices according to the invention, which is similar to the construction of a shell-and-tube heat exchanger, is also conceivable. Furthermore, any other arrangement of at least two devices according to the invention should also be included in the present case.

The material for the outer body should be corrosion resistant to the cleaning medium that surrounds the outer body and the medium that is located within the device. Furthermore, the material should have the highest possible thermal conductivity. Therefore, metals are particularly conceivable for the outer body, which, if necessary, can have additional corrosion protection.

The material that is used in the inner body should above all have the highest possible corrosion resistance to the medium that is used in the device. Metals are also conceivable for this purpose, which, if necessary, can have additional corrosion protection.

Furthermore, by changing the size of the inner body and / or outer body, the size of the intermediate space can be adjusted such that the medium used is in gaseous form in the largest possible volume of the intermediate space. This can increase the efficiency of heat transfer. Furthermore, the amount of steam and liquid medium flowing into the inner body can be adjusted via the size or flow rate of the flow bridges. This can support the convection caused by the heat supplied.

The change in the heating output by the heating cartridge can also influence the rate at which steam is generated. The amount of heat transferred from the device to the cleaning medium can be determined or influenced in this way.

list of figures

• 1 eine schematische Darstellung einer erfindungsgemässe Vorrichtung in einem Behälter zum Erhitzen eines Reinigungsmediums;
• 2 einen Querschnitt durch die Vorrichtung nach 1;
• 3 den Ausschnitt Y aus 2, der eine erste Durchflussbrücke zum Einströmen von Medium zeigt;
• 4 den Ausschnitt Z aus 2, der eine andere Durchflussbrücke zum Ausströmen von Dampf zeigt;
• 5 bis 7 einen Innenkörper der Vorrichtung mit verschiedenen Ausführungsformen der ersten Durchflussbrücke zum Ausströmen von Dampf;
• 8 bis 11 einen Schnitt durch die Horizontale eines Innenkörpers auf Höhe einer Längsachse L und damit eine Draufsicht auf verschiedene Ausführungsformen der anderen Durchflussbrücke zum Einströmen des flüssigen, zuvor kondensierten Mediums;
• 12 eine weitere Ausführungsform einer Vorrichtung nach 1; und
• 13 eine weitere Schnittdarstellung durch die Horizontale auf Höhe der Längsachse L des Innenkörpers der Ausführungsform nach 12.

Further advantages, features and details emerge from the following description of preferred exemplary embodiments and from the figures. These show in

• 1 a schematic representation of an inventive device in a container for heating a cleaning medium;
• 2 a cross section through the device 1 ;
• 3 the neckline Y out 2 , which shows a first flow bridge for inflow of medium;
• 4 the neckline Z out 2 showing another flow bridge for steam to escape;
• 5 to 7 an inner body of the device with various embodiments of the first flow bridge for the outflow of steam;
• 8th to 11 a section through the horizontal of an inner body at the level of a longitudinal axis L and thus a top view of various embodiments of the other flow bridge for inflowing the liquid, previously condensed medium;
• 12 a further embodiment of a device according to 1 ; and
• 13 another sectional view through the horizontal at the level of the longitudinal axis L of the inner body according to the embodiment 12 ,

embodiment

1 schematically shows a device according to the invention 1 for heating and a longitudinal axis L the device 1 in a container 2 for a cleaning medium.

With this container 2 can be both a container 2 act in which a cleaning agent bath of a system for surface cleaning and / or degreasing is carried out, ie in which workpieces for cleaning and / or degreasing are immersed in a heated cleaning medium. However, it can also be a container 2 act in which the cleaning medium is evaporated. Such an evaporator is used, for example, in a system for vapor phase cleaning. The use of a device is also general 1 possible for heating as a heat exchanger in any type of heating.

2 shows a cross section perpendicular to the longitudinal axis L a device according to the invention 1 for heating in one embodiment. The device closes to a cleaning medium 1 with an outer wall 13 from an outer body 3 from. This outer body 3 is in 2 shown in an embodiment with a circular cross section. From the longitudinal axis perpendicular to the plane of the drawing L starting, which in this case is the center of the circular cross section of the outer body 3 is located inside the outer body 3 an inner body 4 , The inner body 4 in one embodiment also has a round, in particular circular, cross section. The inner body 4 and the outer body 3 form a gap 12 , This space 12 is particularly by an inner wall 14 of the outer body 3 and an outer wall 15 of the inner body 4 educated. Furthermore shows 2 that the device 1 is partially filled with a medium. The medium is especially water 8th or a mixture consisting of water 8th and one or more additions. It is advantageous for a device according to the invention to provide a medium which can be vaporized by supplying thermal energy.

Inside the inner body 4 there is a heating cartridge 5 , The heating cartridge 5 lies in the embodiment shown on the longitudinal axis L , In further exemplary embodiments, the heating cartridge can 5 elsewhere within the inner body 4 are located. However, you should essentially below a liquid surface 10 that are in the inner body 4 sets. It is preferably the heating cartridge 5 around an electric heating cartridge. There is also the possibility that the heating cartridge 5 in the inner body 4 is integrated and / or that the heating cartridge 5 and the inner body 4 are integrally formed.

Furthermore, in 2 a first flow bridge in the form of an opening 6 in the inner body 4 to escape steam 9 in the space 12 shown. 4 shows the detail enlarged Z out 2 , Inside is a nozzle shape of the first breakthrough 6 shown.

Furthermore, in 2 another flow bridge in the form of a breakthrough 7 for inflowing water 8th in the inner body 4 shown. 3 shows the detail enlarged Y out 2 , In it is the other breakthrough 7 that is essentially on the opposite side of the first breakthrough 6 is shown. Furthermore, in 2 shown that the first breakthrough 6 to escape steam 9 essentially larger than the second breakthrough 7 for inflowing water 8th is. With the breakthrough through the other 7 inflowing water 8th it is condensate 17 which is in the space 12 by condensing the steam 9 arises.

In the 5 to 7 are different embodiments of the first flow bridge in the form of the first breakthrough 6 in the inner body 4 as well as the longitudinal axis L shown. 4 shows the first breakthrough 6 in a typical embodiment as a slot. The 6 and 7 show a variety of embodiments of the first breakthrough 6 , In one embodiment, the in 5 first breakthrough shown 6 used.

The 8th to 11 show the top view of a horizontal section through the inner body 4 at the level of the longitudinal axis L , Are represented by the 8th to 11 different possible embodiments of the flow bridge in the form of the other opening 7 for inflowing water 8th in the inner body 4 , The 10 and 11 show a variety of breakthrough embodiments 7 for inflowing water 8th in the inner body 4 , In one embodiment, the in 8th shown other breakthrough 7 used.

In 12 is a cross section perpendicular to the longitudinal axis L a further embodiment of a device according to the invention 1 shown. Unlike the one in 2 shown device 1 this only shows a first breakthrough 6 on and no other breakthrough 7 ( 13 ). The condensate 17 can be led out of the space in this case, for example, via a condensate return pump, not shown. Then the condensate and / or fresh water 8th back into the interior of the inner body 3 be initiated. The device can also 1 in this case no possibility of returning the condensate 17 have, whereby the condensate in the intermediate space evaporates again at least partially by the supply and transfer of thermal energy.

The operation of the present invention is as follows:

In the in 2 shown embodiment of the device 1 is achieved by supplying electrical energy and converting it into the heating cartridge 5 to thermal energy, the water 8th heated in the inner body. The electrical heating cartridge heats up 5 the water 8th in the inner body 4 until evaporation. Then the steam flows 9 about the first breakthrough 6 in the from outer body 3 and inner body 4 formed space 12 , There is steam 9 Thermal energy via the outer body 3 to the cleaning medium that the outer body 3 surrounds. The steam begins when the heat is released 9 on the inner wall 14 of the outer body 3 to condense and collect in the space 12 , Then the water flows 8th about the other breakthrough 7 back into the inner body 4 and the cycle starts again.

In the in 12 shown embodiment of the device 1 becomes the water 8th also by supplying thermal energy via the heating cartridge 5 evaporated. The resulting steam 9 then flows over the first breakthrough 6 in the space 12 in which it releases heat through the outer body 3 to the cleaning medium on the inner wall 14 of the outer body 3 starts to condense. The condensate 17 then collects in the space. The heat energy from the heating cartridge 5 on the water 8th and from this over the inner body 4 on the condensate 17 is transferred, the condensate leaves 17 then evaporate again.

In a further embodiment of the device according to 12 becomes the condensate 17 led out of the space, which can be done for example via a condensate return pump, not shown. Then the condensate 17 back into the inner body 4 introduced, with the possibility that condensate 17 prepare beforehand. With the condensate 17 that is in the space 12 collects and then derived and / or evaporated again and / or back into the inner body 4 flows, it is the condensed steam 9 and therefore water 8th or the mixture, which is preferably water 8th and one or more additions.

LIST OF REFERENCE NUMBERS

1

Heating device

2

container

3

Outside body

4

inner body

5

Cartridge Heater

6

Breakthrough for medium outflow

7

Breakthrough for the inflow of medium

8th

water

9

steam

10

Liquid surface in the inner body

11

Liquid surface in the outer body

12

gap

13

Outer wall outer body

14

Inner wall outer body

15

Outer wall inner body

16

Inner wall inner body

17

condensate

L

longitudinal axis

Claims (8)

Device (1) for heating a degreasing and / or cleaning system, which comprises a heating cartridge (5), with an outer body (3) and an inner body (4), characterized in that the inner body (4) in the outer body (3) The inner body (4) has a first flow bridge (6) for the escape of steam (9), the inner body (4) has another flow bridge (7) for the inflow of medium (8), the flow bridges ( 6, 7) are located in the inner body (4) on essentially opposite sides, the first flow bridge (6) for the escape of steam (9) being larger and / or more permeable than the other flow bridge (7) for the inflow of medium (8) , wherein the flow bridges (6, 7) are breakthroughs, the first breakthrough (6) of the inner body (4) for the escape of steam (9) being nozzle-shaped. Device according to one of the preceding claims, characterized in that a condensate return pump is assigned to an intermediate space (12) between the outer body (3) and the inner body (4). Device according to one of the Claims 1 or 2 , characterized in that the first opening (6) of the inner body (4) for the escape of steam (9) is preferably slot-shaped. Device according to one of the preceding claims, characterized in that the inner body (4) and the outer body (3) are partially filled with a medium (8). Device after Claim 4 , characterized in that the medium (8) can be heated with the heating cartridge (5) until evaporation. Device according to one of the preceding claims, characterized in that it is an electrical heating cartridge (5). Device according to one of the preceding claims, characterized in that the outer body (3) and the inner body (4) have a preferably round design Use of the device according to one of the Claims 1 to 7 in - systems for surface cleaning with solvents, - systems for surface cleaning with water and / or water vapor, - vapor phase cleaning systems, - systems for degreasing objects and - in any type of heating device as a heat exchanger.

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