DE102013211556A1 - Heating device for a pump and pump - Google Patents

Abstract

A heating device for an impeller pump with a pump housing and a pump chamber therein, which forms an essential part or a boundary of the pump chamber in the radial direction, has a tubular, round support. The carrier projects at least at one end with a protrusion area over a plane perpendicular to the longitudinal axis and runs with a shelter area along this plane or below. The heating device is advantageously cut off obliquely at this end.

Description

Field of application and state of the art

The invention relates to a heating device for a pump, preferably an impeller pump or radial pump, and a pump provided therewith.

From the EP 2150165 B It is known to provide an impeller pump or radial pump with an integrated heater. The heater is tubular and forms part of an outer wall of a pump chamber. On the outside of the heater heating means in the form of Dickschichtheizleitern are provided. On the inside of the heater, the circulating water flows out of the pump chamber along its path from the impeller to the outlet. There is a strong desire to be able to provide the highest possible heat output here or to be able to achieve the best possible heating of the pumped water.

Task and solution

The invention has for its object to provide an aforementioned heating means for a pump and a pump provided therewith, which problems of the prior art can be avoided and it is in particular possible to make a heater useable and with the highest possible heating power to To be able to heat water as well as possible during pumping or conveying.

This object is achieved by a heating device having the features of claim 1 and a pump provided with the features of claim 10. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. Some of the features are explained only for the heater or only for the pump. However, you should be able to apply independently for both the heater and the pump independently. The wording of the claims is incorporated herein by express reference.

It is provided that the heating device is arranged in a pump with pump housing and pump chamber therein in or on this pump chamber or preferably serves as a boundary of the pump chamber in the radial direction. In particular, the heating device forms a circumferential outer wall of the pump chamber of the pump. For this purpose, the heating device has a carrier as a kind of tube with a round cross-section around a longitudinal axis of the heating device around.

According to the invention, the carrier protrudes at at least one end with a projection region over a plane perpendicular to the longitudinal axis, or the carrier is longer at this peripheral region than at another. At this supernatant area, the carrier is thus longer than usual, so to speak. Furthermore, the carrier has a shorter area or shelter area with which it runs along this plane or even below this plane. Thus, the shelter area can define the actual length of the beam along the longitudinal axis, especially if the shelter area is longer or larger. At the supernatant region, the carrier projects with an area or a distance, so to speak, and is therefore longer here.

Thus, it is possible with the invention that the heater may be longer in some areas where they do not necessarily have to have a single and uniform length. Thus, for example, it can be better fitted in a pump housing or in a pump chamber. Furthermore, it is possible that thereby a kind of enlargement of the surface of the heater and thus also the heating power can be achieved. This will be explained in more detail below.

In an embodiment of the invention, the carrier may have different heights or different lengths in the axial direction of said longitudinal axis. It can be provided that it has exactly one supernatant region and at least one shelter area, preferably also exactly one shelter area. Essentially, it depends on the fact that the carrier or the heating device is just longer in one area, namely the supernatant area, and protrudes from the other shape.

In an advantageous embodiment of the invention can be provided that the other end of the carrier is cut straight. Advantageously, such a section is parallel to the said plane perpendicular to the longitudinal axis or perpendicular itself, because it is relatively easy to perform on the one hand. On the other hand, an adaptation of the carrier or the heating device to a flat side of the pump chamber can take place. A truncation of the heater or the carrier can advantageously be done with laser.

The protrusion region can be formed so that the carrier is simply cut off at one end at an angle. This results in a cutting plane that can be at an angle of 5 ° to 45 ° to the longitudinal axis. Preferably, it can be at an angle of 15 ° to 30 ° to the longitudinal axis. Thus, the oblique cut on the carrier is formed so that forms a continuously rising and then continuously falling supernatant region.

In an embodiment of the invention, the supernatant region may be formed as a protruding region such that it rises sharply rising from a rather straight cut off carrier, forms a tip or a maximum projection and then drops again. An increase and decrease in the supernatant region can generally be symmetrical or unbalanced. Thus, the supernatant region may increase slowly and then fall sharply and significantly steeper after a maximum supernatant.

In a further embodiment of the invention, an end edge or cut edge of the carrier can run continuously at the end with the protrusion region. Advantageously, neither heels nor angles are provided, whereby both a production of the heater and a fitting in a pump chamber is easier. In this case, the pitch of the projection region can be formed at least partially varying. Alternatively, the end edge of the carrier can just run in a plane here.

In a further embodiment of the invention, the carrier may have a tube as a basic shape. This is advantageously a cylindrical tube. It should have approximately constant wall thickness. Particularly preferred is a cylindrical tube with a circular cross-section. Such a tube is easy to manufacture and also has very good properties for use in an impeller pump or radial pump as outer Pumpenkammerwandung. It may consist of stainless steel for corrosion resistance, as it is basically known for this purpose.

In an advantageous embodiment of the invention, the heating means or heating elements are arranged for this purpose on an outer side of the carrier or the heating device. Preferably, the heating means are distributed over a surface or cover not only itself directly an area with a certain Heizmittelbreite. Rather, they can, of course, with a certain distance to each other, cover a certain or larger area and thus also produce an approximately evenly distributed area performance. In particular, a substantial part, preferably at least 50%, or the largest part of the surface of the carrier is heated. Preference is given to thick-film Heizleiterbahnen than Heizleiterbahnen, since they can be applied in various varied form, for example, with a corresponding output thick film paste with screen printing process or the like.

In a basic embodiment of the invention, it can be provided that in the projection region the heating means themselves or the heating device have the same or a substantially constant area performance. This can be achieved that the essential surface of the heater or the carrier undergoes uniform heating and so even heat transfer takes place evenly in the funded and heated liquid. In order to achieve this, an additional or extended heating means can be provided in the projection region, which would otherwise not be present. Thus, the overall performance of the heater may increase as the area of the carrier increases through the overhang area.

In another basic embodiment of the invention, the heating means or the heating device may have an unequal or a different area performance in the projection region. On the one hand, this can be achieved by providing no heating means or only a very small amount of heating means in the projection region. By the heat conduction of the carrier itself, in particular in the case of metal or stainless steel as a carrier, the heat transfer surface can be increased to the pumped liquid out, which is usually accompanied by an additional heating. On the other hand, a surface output can also be provided in the supernatant region by a heating means, which adds up to the previous area performance of the carrier. This can be exploited that near the supernatant region a particularly good heat dissipation by the pumped liquid takes place, for example because it flows very fast or very good along.

The pump according to the invention, in particular as an impeller pump or radial pump, has at least one inlet into the pump chamber on the pump housing or on the pump chamber and at least one outlet out of the pump chamber. Advantageously, the inlet leads along the longitudinal central axis of the pump or concentric with an impeller axis into the pump chamber and toward the impeller. Starting from the impeller, the pump chamber can extend around it, essentially in an annular manner. A substantial area of the outer wall of the pump chamber is then formed by the aforesaid heating device, as it were a kind of shell wall of the pump chamber.

An outlet from the pumping chamber may be provided at an end of the pumping chamber remote from the impeller. The outlet goes from the end of the pump chamber with a width that starts from the width of the pump chamber and then increases. Advantageously, the pump chamber rises in the region just before the outlet, for example along a half or a third revolution an angle between 5 ° and 30 ° to the plane perpendicular to the longitudinal central axis of the pump and can then open into the outlet. In this rising region just in front of the outlet or outlet, the supernatant region of the heating device can be arranged so that it can take advantage of the existing at this point greater height of the pump chamber, which appears as a kind of supernatant and run it. As previously mentioned, this generally makes use of an additional possibility of an enlarged heater with more area. Furthermore, good heat dissipation is possible here due to the good flow along the conveyed water.

The other end of the heater, which is advantageously cut approximately straight, may be arranged at the other axial end portion of the pump chamber, in particular close to the impeller or these and the inlet radially surrounding approximately. This takes into account that the impeller usually rotates on a boundary of the pump chamber running essentially in one plane or at least rotationally symmetrical, which just favors a straight-cut end of the heating device.

These and other features will become apparent from the claims but also from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in an embodiment of the invention and in other fields be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into intermediate headings and individual sections does not limit the general validity of the statements made thereunder.

Brief description of the drawings

Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. Showing:

1 a section through a pump according to the invention with a heating device according to the invention,

2 to 5 various oblique views of heating devices according to the invention with oblique protrusion areas and different arrangements of heating conductors thereon,

6 a modified pump according to the invention with a heating device according to the invention in side view,

7 the pump off 6 rotated 90 ° about its longitudinal axis,

8th the pump off 7 once again rotated by 90 ° about its longitudinal axis,

9 the pump off 8th once again rotated by 90 ° about its longitudinal axis,

10 a sectional view through the pump in the position according to 6 .

11 the sectional view of the pump accordingly 10 with cut plane shifted into the plane of the drawing and

12 the sectional view of the pump accordingly 10 with cut plane shifted out of the drawing plane.

Detailed description of the embodiments

In the 1 is a pump according to the invention 11 with a pump housing 12 shown in section, which is designed as an impeller pump or radial pump. It can be used advantageously in a dishwasher or in a washing machine. The pump housing 12 has an inlet 13 and an outlet 14 including outlet 15 from an annular pump chamber 16 out. Close to a pump chamber floor 17 is a common impeller 18 arranged as an impeller by an unspecified pump motor 20 is driven. Such a pump is known from the DE 102011003467 A1 ,

Radially outward is the pump chamber 16 from a heater 22 limited according to the invention, which simultaneously forms an aforementioned radial outer Pumpenkammerwandung. The heater 22 consists of a metallic tubular support 24 and on its outside arranged heating elements 26 , Its possible training will be explained in more detail below. The heater 22 it sits together with a U-like overlapping sealing ring 23a and round sealing ring 23b sealed in the pump housing 12 ,

How out 1 and the associated 2 to 5 It can be seen is the heater 22 on the one hand round or circular formed, advantageously cut to length by a pipe. Furthermore, she or the carrier 24 in the 1 below an aforementioned projecting area 28 on, with which it projects beyond a plane perpendicular to the dashed longitudinal axis L of the heater 22 as well as the pump 11 runs through and through the top in 1 top left at the heater 22 runs. In a simple embodiment, the heating device 22 according to the 2 . 4 and 5 be cut off at an angle. According to the 3 that a simplified heating device 22' represents a supernatant area 28' also not be continuously formed or distinctly pronounced as a tip or towering tongue, so with a strong increase and heavy waste just before the top 28' , This has been explained above.

From the 1 is also good to recognize the advantage of the supernatant region according to the invention, namely that thus also the heater 22 as well as heating elements 26 and thus a heating power in the region of the pump chamber 16 may be provided, which is partially increased in the circumferential direction to the outlet 14 and then the outlet 15 proceed. This allows the total in the pump 11 provided heated area can be increased and, for example, as will be explained below, the total intended heating power can be increased, so that under certain circumstances, a surface power to the heater 22 or on the carrier 24 remains roughly the same.

The shape of the outlet 14 or the left end of the pump chamber 16 One can easily imagine that from the area top left in 1 the pump housing 12 and in particular also the heating device 22 correspondingly rising and thus no longer perpendicular to the longitudinal central axis L to the area runs, the bottom left in the 1 is shown. In particular, from the isolated representations of the heaters of 2 . 4 and 5 this can be seen. A seal by means of the sealing rings 23a left and 23b right is at the left seal 23a somewhat more complicated because it does not run in a plane perpendicular to the longitudinal central axis L. But this can just be easily solved by the left seal 23a as shown, a left end edge of the heater 22 U-style includes and thus tight and tight sits on it.

In the 2 is now on the basis of a removed heater 22 represented as there circulating heating elements 26a to 26d are arranged. The three lower heating elements 26a to 26c proceed from a contact 27a parallel to each other and also parallel to the lower, so to speak straight end edge of the heater 22 , The top heating element 26d runs slightly upwards into that of the supernatant area 28 created area and thus has much greater distance to the nearest heating element 26c on. Due to the lateral heat distribution in the carrier 24 the heater 22 can be assumed that also in this intermediate region, a heating of the liquid flowing along it takes place. Essentially, however, this is a variant of a heating device which has approximately the same total heating power when the surface area is increased.

In the 4 is another heater 122 shown in the case of contacts 127a and 127b in turn heating elements 126a to 126e depart and approximately in the direction of rotation of the heater 122 or the corresponding support tube 124 run. In this case, the heating elements 126a to 126e As far as possible distances to each other, so that only the bottom heating element 126a parallel to the lower straight end edge of the heater 122 runs. Already the next heating element 126b has already moved up a bit and thus no longer runs parallel to it. Here it should be noted that due to the oblique courses of the heating elements 126 their lengths are slightly different. This should be compensated by appropriate change in their resistances or cross sections, in particular the width, so that each of the heating elements generates as much heat as possible. With this embodiment of the heater 122 can, though the heating elements 126 to the top heating element 126e have an increasing length, also remain a total heating power remain the same despite the added supernatant 128 ,

In the 5 is a further modification of a heating device according to the invention 222 shown. Again, run on a tubular support 224 several heating elements 226a to 226d , While the three lower heating elements 226a to 226c are formed similarly and parallel to each other and parallel to the lower end edge of the carrier 224 run, is an upper heating element 226d trained differently. It is, in addition, also the gained area of the supernatant area 228 take advantage of meandering or wavy and thus directly covers a larger area. Furthermore, the heating element heats up 226d an even larger area due to its undulating shape. Due to its length, in turn, a cross-section, in particular a width, of the heating element 226d compared to the other heating elements 226a to 226c be reduced, so that it also has a significantly higher heating capacity.

Thus, the heater is 222 according to 5 an example of how can be achieved by the increased surface area of the heater or the carrier, a total significantly increased total heating power. With appropriate design of the uppermost heating element 226d can also be roughly the area performance of the heater 222 approximately the same as that of a heater just cut off above with four heating elements corresponding to the heating elements 226a to 226c correspond.

In the 6 is another pump 311 schematically shown with a different pump principle, as is known from the German patent application DE 102013211180.0 with filing date of 14 June 2013 the same applicant is known. Here has a pump housing 312 an inlet 313 in a pump chamber, which can not be seen here 316 on, with a likewise not shown impeller very close to the inlet 313 is arranged, so far left. Although this corresponds to some extent the pump 11 out 1 , However, then it is at the pump 311 of the 6 the pump chamber 316 and a heater surrounding the pump chamber 322 designed so that it runs from the impeller in the other direction, ie to the right, especially in the direction of a pump motor 320 or under certain circumstances, it may even outrank it a bit. In particular, a supernatant area 328 the heater 322 is now in a direction to the right away from the impeller and inlet 313 above.

In the 6 is in the upper right near the supernatant area 328 the heater to recognize, as there is an outlet 314 from the pump chamber 316 or the pump housing 312 is provided, in the direction of rotation of the pumped liquid in the plane of the drawing to the outlet shown below 315 leads. At the outlet 315 even you can see that here is the heater 322 can not have a high altitude. Like in 1 However, it can be seen in the top of the page 6 in the area of the outlet 314 very well the clearly pronounced supernatant area 328 be provided.

The heater 322 can basically as described above or according to the 2 . 4 and 5 be formed, ie outside wear heating elements with different training and / or arrangement.

The rotation according to the 7 to 9 by 90 ° each, as with the obliquely cut heater 322 or the correspondingly formed projection region 328 the special shape of the outer wall of the pump chamber 316 can be used to form the heater, which forms a substantial part of this pump chamber wall, as large as possible.

From the 9 Once again, it has to be seen specifically that in the area where the outlet 314 or the outlet nozzle 315 separated from the pump chamber, a supernatant area can not be provided.

The shifted cutting planes of the 10 to 12 make the course or the shape of the heater 322 once again clearly. In particular, it becomes clear how the maximum possible space or the maximum possible area on the outer pump chamber wall is used for the heating device. It is assumed that here the pump chamber or the pump housing in the form essentially of an optimized outlet 314 or outlet nozzle 315 is shaped.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2150165 B [0002]
• DE 102011003467 A1 [0031]
• DE 102013211180 [0040]

Claims (12)

A heating device for a pump with a pump housing and a pump chamber therein, preferably an impeller or radial pump, for arrangement in or on the pump chamber or as a boundary of the pump chamber in the radial direction, wherein the heating means a carrier as a kind of tube with a round cross-section around a Having longitudinal axis around, characterized in that the carrier protrudes at least one end with a protrusion region over a plane perpendicular to the longitudinal axis and extends with a shelter area along this plane or below. Heating device according to claim 1, characterized in that the carrier has different heights in the axial direction of the longitudinal axis seen in the circumferential direction, preferably exactly a supernatant region and a shelter area, in particular exactly one shelter area. Heating device according to claim 1 or 2, characterized in that the other end of the carrier is cut straight, preferably parallel to said plane perpendicular to the longitudinal axis. Heating device according to one of the preceding claims, characterized in that the carrier is obliquely cut off at the end with the protrusion region with a cutting plane which is at an angle of 5 ° to 45 ° to the longitudinal axis, preferably 15 ° to 30 °. Heating device according to one of the preceding claims, characterized in that at the end with the supernatant region, an end edge of the carrier runs continuously without paragraphs or angles, preferably in a plane. Heating device according to one of the preceding claims, characterized in that the support is a tube as a basic shape, in particular a cylindrical tube, preferably a cylindrical tube with a circular cross-section. Heating device according to one of the preceding claims, characterized in that arranged on an outer side of the carrier heating means, preferably distributed over a surface, in particular as Heizleiterbahnen such as thick film Heizleiterbahnen odgl .. Heating device according to claim 7, characterized in that in the supernatant region, the heating means or the heating means have the same or a constant area performance. Heating device according to claim 7, characterized in that in the supernatant region, the heating means or the heating means have an unequal or a different area performance. Pump, preferably impeller pump or radial pump, for water-conducting electrical appliances, with a pump housing and a pump chamber therein, wherein at least one inlet into the pump chamber into leads and at least one outlet out of the pump chamber out, characterized in that in the pump chamber, a heater after a the preceding claims is arranged. Pump according to claim 10, characterized in that the heating device forms a radially outer boundary of the pump chamber, preferably the essential region of a radially outer border or jacket wall of the pump chamber. Pump according to claim 10 or 11, characterized in that the pump has a central inlet in the longitudinal direction of the pump in the pump chamber, wherein the inlet leads to an impeller or an impeller of the pump and wherein starting from the impeller radially outside thereof, the pump chamber is annular the impeller is formed at least partially surrounding, wherein the pump chamber in the axial direction of the pump extends away from the impeller to the outlet of the pump chamber at an end remote from the impeller end of the pump chamber, wherein the outlet from the end of the pump chamber, the projecting region the heater is arranged in the region of the pump chamber near the outlet or in the circumferential direction in front of the outlet, wherein preferably the heater is arranged with the other end near the impeller and radially outside of the impeller and approximately at its axial height and here the end just cut off.

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