JP6570299B2 - pump - Google Patents

Description

  The present invention relates to a pump having a pump casing and a pump chamber therein, which pump is specifically designed as an impeller pump.

  A typical pump is known from DE 102007017271 A1. It can be advantageously used for domestic appliances, such as in particular dishwashers or washing machines.

  The object of the present invention is to provide a pump as mentioned at the outset, whereby the problems of the prior art can be avoided, in particular such a pump is simpler, more versatile and more compact. It is possible to have a configuration.

  This object is achieved by a pump having the features of claim 1. Advantageous and preferred improvements of the invention are the subject of further claims and are described in more detail below. The terminology of the claims becomes the content of the description by explicit reference.

  A pump, preferably an impeller pump, is provided, which has a pump casing in which the pump chamber is located. In addition, the pump has a pump cover with an inlet to the pump chamber, precisely for use as an impeller pump, the inlet to the pump chamber is at or along the center of the pump shaft, in particular the impeller shaft of the impeller pump. Exist along. Furthermore, the pump has a pump bottom and a jacket between the pump bottom and the pump cover, which jacket has or is essentially formed by the jacket wall. The pump chamber is therefore arranged essentially in the jacket or in the jacket wall and is thereby defined and further by the pump cover and the pump bottom. The jacket in this case is in an annular form and extends continuously around the pump or around the pump chamber. It can be configured as a kind of tubular part, preferably as a cylindrical tubular part. In addition, the jacket or jacket wall carries at least one heating element that is permanently fixed thereto. Such a heating element can correspond to a known heating element for a pump to be heated, ie a tubular heating element, alternatively and advantageously a thin or thick film heating element formed in film form.

  Further, the jacket has an orifice or jacket orifice that forms an outlet from the pump chamber. This orifice is then merged into the delivery connection of the pump, or this delivery connection is attached to the orifice in the jacket or jacket wall, advantageously in a sealed manner, as will be explained in more detail below.

  According to the invention, as an outlet from the pump chamber, said orifice for the delivery connection or jacket orifice is completely present in the jacket wall of the jacket or does not reach the edge or outer edge of the jacket or jacket wall Or do not protrude beyond this. What can be achieved thereby is advantageously that, on the one hand, the delivery connection part as a structural part is continuously continuous with the jacket or jacket wall all around and with good sealing and stable permanent fixing. Therefore, it is to press with an effective sealing method. Furthermore, as a structural part, the delivery connection part can be pressed against the jacket wall at its compression surface, in particular continuously with the seal, all around or around the orifice on the jacket wall. Thus, a good mechanical and sealing connection at the pump cover and / or pump bottom can be made at the edge of the jacket wall near the orifice. Furthermore, the jacket has a high inherent stability as a structural part. Further advantages are apparent from the features described below.

  In an advantageous refinement of the invention, the jacket has an edge that is straight and / or in one plane on at least one side that faces towards the pump bottom or towards the pump cover. The jacket or jacket wall is therefore cut straight at at least one end, thus facilitating both sealing connection and manufacture to the pump bottom and pump cover. Advantageously, this type of edge can be provided on both sides or on both sides in one plane, particularly preferably the edges extend in parallel.

  In an improvement of the invention, the jacket is made of metal, which is preferably of uniform thickness, for example sheet metal. It can have a thickness of 0.5 mm to 2 mm, preferably about 0.7 mm to 1.5 mm. Particularly advantageously, it can consist of a corrosion-resistant metal such as, for example, a high grade steel or a high alloy steel. Thus, for example for use in a washing machine or dishwasher, the jacket is resistant not only to the water being carried, but also to chemically and mechanically aggressive components, especially in the dishwasher. .

  In an improvement of the invention, the jacket results from its manufacture, more precisely it is made from sheet metal strip, which is bent into a tubular form and then welded at the ends to form a tube. Occasionally has a connecting weld line. This connecting weld line interrupts the jacket, so to speak. The aforementioned orifice for the outlet can be arranged at a distance of less than 2 cm from the connecting weld line, preferably at least a distance of 1 mm or 2 mm. Thus, it is placed close to this, but it does not interrupt the connection weld line, thus avoiding the strength and corrosion problems of the cut connection weld line. At the same time, other areas outside the jacket can be left free for further use, due to the arrangement relatively close to each other, e.g. holding freely for the arrangement of heating elements and / or connections or contacts Can do. Alternatively, the orifice can also interrupt the connection weld line, especially when a stable design with a long lifetime is required in the region of the connection weld line interruption.

  In a further refinement of the invention, the jacket also has the connecting weld line. Here, in the region of this connection weld line, connection locations and / or contact devices for at least one heating element are particularly advantageously provided at a short distance of 1 mm or 2 mm to 2 cm. They are therefore close to the connecting weld line, otherwise leaving large or significant areas of the jacket free, for example for heating elements. In this case, in particular, it is possible for the connecting weld line to be provided substantially opposite the orifice for the outlet. Precisely, when electrical contacts and / or heating elements in the form of conductor tracks or the like are applied to the jacket, it is advantageous here that there are no connection welds in the middle. Since the weld connection line always constitutes a non-uniformity on the surface of the heating element, it is difficult to give it a conductor track or to print it with a conductor track or to coat it by thin film technology.

  In a further refinement of the invention, the delivery connection part can be fixed directly to the jacket by a fixing part, especially as a separately manufactured structural part made from plastic. In particular, on the one hand, the delivery connection can be glued to the jacket. On the other hand, the delivery connection can be secured to the jacket by a securing means such as a latching hook or the like that engages in the orifice. Alternatively, these securing means do not engage into the jacket through one orifice, but preferably through a distinctly smaller separate orifice. The fixing part can protrude slightly through the orifice or into the jacket wall, in particular with the fixing means. Locking against the lateral force can thereby be achieved to some extent.

  In a further refinement, the securing part can have retaining means that engage from inside into the jacket to secure the delivery connection part to the jacket. However, these retaining means do not engage in the orifice for the outlet, but engage in a retaining hole in the jacket which is separated from the orifice or at a distance of at least 5 mm to 10 mm therefrom. The retaining holes should be separated from the orifice in the circumferential direction of the jacket, so that they are tensioned around the jacket and therefore also to some extent around the orifice for the purpose of reliable leak-proof permanent fixation. Below the delivery connection can be fixed to the jacket.

  One possibility for forming the securing means is to have a latching hook or the like, which can be mechanically held and released non-destructively under certain conditions. In particular, they can be fixed by automatic latching in a single work process. Separate fixing spreaders can also be used. Another possibility is to have a rivet joint or the like, but it is not releasable and represents a little more expense for manufacturing. Yet another possibility is adhesive bonding.

  In an improvement of the invention, the fixing part can be pressed with an edge with a certain width against the outside of the jacket or jacket wall. This edge may be provided with sealing means, which are advantageously at least partially introduced into the edge and buried in the countersink, so that they are above the edge, for example with a maximum of 1 mm or 2 mm. Slightly protrudes. The delivery connection part is fixed to the jacket by pressing the fixing part directly against the jacket or the jacket wall, in which case the compressed sealing means are compressed in addition to the mechanically dimensionally accurate abutment. And is already in place to ensure leakage prevention. The sealing means can be sealing means attached, inserted or applied individually in the form of a sealing rubber or annular seal. Alternatively, they can be produced with a fixed part or a delivery connection part, preferably by a multi-component injection molding process.

  The sealing means can extend near the outer edge of the edge of the fixing part, preferably at a distance of less than 3 mm from the outer edge, particularly preferably at a distance of 0.5 mm to 2 mm or 3 mm. In this case, the sealing means surrounds the orifice and extends to the delivery connection, or also surrounds the jacket orifice. Furthermore, the sealing means may also enclose or enclose the fixing means, whereby the fixing parts are fixed in particular where they engage through a jacket or cooperate with a retaining hole or hole for fixing purposes. When it is means, it is fixed to the jacket.

  In an alternative refinement of the invention, a peripheral sealing means with a peripheral sealing edge can be provided on the fixed part for sealing. Its outline corresponds approximately to the outline of the jacket orifice edge. Provided at the peripheral sealing edge is an outwardly directed groove having a width equal to 50% to 150% of the jacket material thickness. The depth of the groove can reach 1 to 10 times or even 15 times the material thickness of the jacket. Such sealing means can be fixed to the jacket orifice in the form of an inner sleeve and at the same time overlap the jacket wall both inside and outside. The fixing part is then pressed directly against the outer area of the seal or with further sealing means.

  In a further refinement of the invention, the fixing part can be provided with a peripheral protrusion on it which has approximately or exactly the form of an orifice. This fixed part engages in the orifice, preferably at a height of at least 50% to 200% of the jacket material thickness. As a result of this engagement, on the one hand the sealing action can be improved. On the other hand, mechanical fixation can be facilitated. This is because the fixing part must only be fixed against being lifted from the jacket and no longer need to be fixed against lateral displacement. The securing portion may be provided with a collar around the projection that presses against the outside of the jacket around the orifice when the projection engages or is flush with the orifice. Good. However, the protrusion should not protrude too deep inward through the jacket or into the pump chamber. This is because the flow behavior of the fluid being carried has a considerable adverse effect. Furthermore, this is not necessary for the fixed operation described above.

  In a further refinement of the invention, a latching hook or the like may be provided as a fixing means on the protrusion which engages in the jacket through the orifice of the fixing part.

  In a further refinement of the invention, the delivery connection part can be pressed around the orifice therein against the jacket by means of sealing as a separately manufactured structural part. In this case, in particular, the sealing means are not provided on the inside of the jacket, but instead are only provided on the outside of the jacket. Therefore, the influence of the reverse flow can be prevented as described above. Particularly advantageously, a sealing means is also provided, if appropriate, at the inner edge of the jacket orifice, but should not protrude further into the pump chamber.

  Advantageously, the delivery connection part may have a closed tubular form, in which case it may have an inlet orifice in the region of the delivery connection part to be connected to the jacket. Furthermore, it has an exit orifice at the free end or the other end. Particularly advantageously, the inlet orifice is formed in exactly the same way as the jacket orifice. The outlet orifice of the delivery connection is preferably circular.

  The delivery connection part can in particular have a straight line or an elongated shape with at least a part of a straight line, and here in the straight region can have a longitudinal central axis. This central longitudinal axis preferably extends as an extension of the delivery connection that faces the jacket or passes through the jacket but does not exceed it. Particularly advantageously, the central longitudinal axis can extend eccentrically with respect to the jacket. That is, it can extend beyond the longitudinal central axis of the jacket. In this case, it can be directed beyond the longitudinal central axis of the jacket in an amount of about 50% to 80% of the radius of the jacket. The delivery connection is therefore secured to the jacket, here obliquely in a transverse direction. Thereby it is possible for the pumped water to flow into the delivery part, so to speak substantially tangentially from the pump chamber.

  In an advantageous refinement of the invention, the jacket orifice is a long hole with a longitudinal extent in the circumferential direction of the jacket. Fixing is thereby further facilitated. Furthermore, the outlet of the fluid carried from the pump chamber can be affected in a more targeted manner, precisely after multiple circulations in them. The jacket orifice can advantageously have an elliptical shape and is therefore elongated, particularly advantageously it can have a length of 1.5 to 3 times its width.

  Advantageously, the jacket can be manufactured with a circular cross-section. In particular, this is done by bending flat metal sheets round and welding together in the manner described at the outset.

  This and further features can be gathered not only from the claims but also from the description and the drawings, and the individual features are subcombinations in each case, in the embodiments of the invention or in other fields. Can be implemented in a plurality or separately in form and can constitute an advantageous and independently patentable form of protection claimed herein. The division of the intermediate headings and individual sections of the application does not limit the general validity of the text made under them.

Exemplary embodiments of the invention are schematically illustrated in the drawings and are described in more detail below.
FIG. 1 shows a perspective view of a pump according to the invention with a delivery connection that exits centrally from the jacket of the pump casing. FIG. 2 shows a jacket that essentially forms a pump chamber with a delivery connection according to FIG. FIG. 3 shows the delivery connection from FIG. 2 in a separate view. FIG. 4 shows an alternative arrangement of the delivery connection portion of the jacket in an arrangement buried in the countersink. FIG. 5 shows the arrangement of the delivery connection on the outside of the jacket with a fixed arm that protrudes angularly on the outside. FIG. 6A shows a further arrangement of the delivery connection on the outside of the jacket with a separate spreading element for fixation to the jacket. FIG. 6B shows the configuration of the delivery connection from FIG. 6A with an inserted sealing ring. FIG. 7 shows the configuration of the delivery connection on the outside of the jacket with two hook-like fastening means on the jacket. FIG. 8 shows a modification of the fixing means from FIG. FIG. 9 shows a further embodiment with two rivets for securing the delivery connection to the jacket. FIG. 10 shows a further variant in which the jacket orifice extends along the edge of the jacket, has a rectangular shape and is fitted with a delivery connection. FIG. 11 shows a variation of the embodiment from FIG. 10 where the jacket orifice is again off the edge. FIG. 12 shows a further variation with a round seal that overlaps the edge of the jacket orifice and is secured to the delivery connection. FIG. 13 shows a further variant similar to the embodiment from FIG. 7 with a plurality of hook-shaped securing means distributed along the jacket orifice.

  FIG. 1 shows a pump 11a according to the invention with a pump casing 12a, which has a pump chamber (not shown here) inside. Above this pump chamber is seated a pump cover 16 having an inlet 17a in the form of a round tubular connection. The pump chamber is delimited by a pump bottom 15 below which a drive motor is arranged for carrying and driving the impeller in the pump chamber according to the prior art.

  The pump chamber is essentially formed by a jacket 20a, which extends around the entire circumference and has a plurality of strip-shaped or elongated heating elements 21 as shown. The jacket 20a is configured as a circular tubular connecting part, with an edge 22a at the top and bottom in each case. In addition, it has a jacket orifice (not shown in detail here), which merges into the delivery connection 25a. The delivery connecting portion 25a is fixed to the jacket 20a by a fixing portion 26a, for example, an adhesive bond. Over the fixing part 26, a fixing edge 28 extends, which can be pressed against the outside of the jacket 20a for this purpose, advantageously in the form of a wide strip, for a stable adhesive bond. Provide sufficient space.

  In the partial view of FIG. 2, the jacket 20a is shown, the form of which can be clearly seen as a circular tubular connecting part. It can be seen that the delivery connection 25a does not protrude into or into the pump chamber 14 formed thereby. It can further be seen how the weld line 24a extends near the delivery connection 25a. This weld line 24a is shown here quite exaggerated to show it more clearly. The weld line 24a is located very close to the delivery connection portion 25a. This makes the space remaining outside the jacket 20a available for the heating element 21a. To be precise, these would otherwise be unable to bridge the weld line 24a. The weld line results from the manufacture of the tubular jacket 20a, in particular it results from welding together flat metal sheets (sheet thickness is 0.3 mm to 2 mm).

  FIG. 3 shows only the delivery connection part 25a and faces towards the fixing part 26a and the fixing edge 28a formed thereon. Adhesive bonding or other pressing from the outside onto the outside of the jacket 20a can be readily envisioned by those skilled in the art.

  A further embodiment is shown in FIG. 4, where the jacket 20b is also circular. As can be seen from the left plan view, the delivery connection portion 25b or its securing portion 26b engages the jacket 20b through the jacket orifice, so that the lateral securing hook 29b engages behind the jacket orifice 29b; The inside of the jacket 20b can be compressed for fixing purposes. In the diagram on the right side of FIG. 4, the delivery connection portion 25b is shown enlarged again for further clarity with the fixing hook 29b.

  A further alternative embodiment is shown in FIG. 5, as well as a circular jacket 20c having a pump chamber 14c therein. The delivery connecting part 25c is here attached from the outside by a fixing part 26c. The left and right fixing hooks 29c are configured in the form of arms with large angles. The enlarged view on the right is also clearer. They engage small holes at their ends, in each case as retaining holes for the jacket 20c, which are separated from the jacket orifice 23c surrounded by the fixing part 26c. Sealing with these holding holes can be performed by elastic sealing or adhesive bonding.

  FIG. 6A shows a further embodiment of the invention in which the delivery connection portion 25d is secured only from the outside to the jacket 20d by the securing portion 26d. The fixed edge 28d seen in the right view in the perspective view, in this case, presses against the outside of the jacket 20d under certain conditions together with sealing means (not shown here). Two separate fixed spreaders 30d are inserted into the two small orifices of the fixed edge 28d and engage into corresponding retaining holes in the jacket 20d, thus fixing the delivery connection 25d thereto. This fixation can also be released again. From the diagram on the left side of FIG. 6A, it can be seen that the fixed spreader 30d protrudes inward only to a minimum, thus impairing the flow conditions of the pump chamber 14d to a minimum.

  The enlarged view of FIG. 6B shows how the sealing ring 31 'can be embedded in the fixed edge 28d. The sealing ring extends near the outer edge of the fixed edge 28d so as to ensure a complete seal.

  In FIG. 7, it can be seen how instead of the separate fixed spreader of FIG. 6, a fixed hook 29e is formed on the fixed edge 28e of the fixed part 26e of the delivery connection part 25e. The locking hooks engage in retaining holes (not shown) in the jacket 20e (shown in the left figure) in a manner similar to the locking spreader described above, but they are not separate parts. However, it can be seen that by protruding, they can adversely affect the flow conditions inside the jacket 20e or the pump chamber 14e.

  FIG. 8 shows a delivery connecting portion 25f having a fixing portion 26f as a modification of the embodiment of FIG. 5, and a fixing hook 29f having a slightly smaller form is provided on the fixing portion 26f. These also engage in separate retaining holes outside the jacket orifice, which must then be sealed separately.

  A further embodiment of the invention can be seen from FIG. 9 with a delivery connection portion 25g, whose fixing portion 26g is fixed only to the jacket 20g from the outside. For this purpose, a rivet 33g is provided, which engages through the lateral outer end of the securing part 26g and extends through a corresponding small retaining hole in the jacket 20g, and then secures the delivery connection part 25g to the jacket 20g. Riveted.

  The view of FIG. 10 shows how the jacket 20h has a rectangular shaped jacket orifice 23h, which can extend along the edge of the jacket 20h, so to say the left edge 22h. The delivery connecting portion 25h is then fixed to this jacket orifice 23h by a fixing portion 26h, and a fixing edge 28h is provided on the fixing portion 26h as the sealing edge described above, where a slot-like groove 34h is formed. The groove 34h has the same length as the jacket orifice 23h and overlaps the jacket 20h particularly advantageously by 1 mm to 5 mm along this length on both sides. In this case, if the fixing part 26h is formed from a hard plastic, the groove 34h corresponds approximately to the material thickness of the jacket 20h, so that it can receive the jacket in a clamping and / or sealing manner. Furthermore, it can also be formed from an elastic sealing material, for example it can be injection-molded onto the remaining delivery connection part 25h or fixing part 26h, so that the sealing operation is further improved. Can do. The groove can also be narrowed and deformed when the jacket 20h is pushed in.

  The fixed portion 26h seals and presses against the short end of the jacket orifice 23h. Here, however, in an alternative embodiment, the groove 34h can again be similarly configured so that it overlaps the jacket 20h in a sealing and securing manner.

  In the variant from FIG. 11, in the case of a jacket 20i having a closed edge 22i, the jacket orifice is again provided away from the edge 22i. The delivery connection portion 25i has a fixed portion 26i, in which a peripheral groove 34i is provided in a form similar to that described for FIG. With the delivery connection part 25i fixed to the jacket 20i, the part of the fixed part 26i located inside the groove is in the jacket 20i or the pump chamber 14i, so that the groove 34i continues the edge of the jacket orifice. Therefore, it is received and sealed all around. Fixing to this type of jacket 20i is not so easy, so the fixing part 26i should be made of an elastic material, especially in the region of the groove 34i, even if it seals very well later. Alternatively, there can be two parts and the outer region of the fixing part 26i can be fixed to the inside fitted from the inside through the jacket orifice.

  In a further variation of the above embodiment of the delivery connection portion 25i on the jacket 20i of FIG. 12, the jacket orifice is in this case configured as an elongated round elongated hole. Correspondingly, the separate fixing part 26j for the delivery connection part 25j has an elongated round shape and then has a peripheral groove 34j. The fixing part 26j, which is constituted separately from the delivery connecting part 25j, is first fixed to the jacket 20j by a flexible material 26j, and at the same time covers the inner edge of the jacket orifice, in particular with its groove 34j, sealing it. To be surrounded. The delivery connecting part 25j is then fixed to the fixing part 26j, for example a little pressed on it or fitted with a stepped protrusion thereon. Further mechanical fastening can be done by ambient tensioning means or other parts on the pump casing. Thus, an effective sealing connection with the jacket 20j can be made.

  Finally, in the view of FIG. 13, in the same way as in FIG. 7, the delivery connection part 25k with the fixed part 26k is fixed to the jacket 20k with the jacket orifice 23k by the six fixed hooks 29k together with the fixed edges 28k. In the same way as in FIG. 7, two fixing hooks 29k are provided at the opposite ends of the jacket orifice 23k and the others are distributed along the intermediate region. The sealing means is not shown here, but can easily be provided according to the above embodiment. By providing a plurality of fixing hooks 29k along the edge of the jacket orifice 23k, good leak-proof permanent fixing is achieved.

Claims (18)

A pump having a pump casing and a pump chamber therein, wherein the pump is
-A pump cover with an inlet to the pump chamber,
A pump bottom, and a jacket having a jacket wall between the pump bottom and the pump cover, the pump chamber being essentially located in or within the jacket wall,
Have
The jacket is configured to extend continuously around the circumference in an annular manner and carries at least one heating element directly fixed unreleasably thereto;
The jacket has an orifice as an outlet from the pump chamber, this orifice merges into the delivery connection of the pump, the orifice is completely present in the jacket wall of the jacket,
A pump wherein the jacket has a connection weld line resulting from its manufacture and an orifice for the outlet is arranged at a distance of less than 2 cm from the connection weld line .   2. The pump according to claim 1, wherein the jacket has an edge that is straight and in one plane on at least one side facing the bottom of the pump or facing the pump cover.   The pump according to claim 1, wherein the jacket is made of metal. The pump of claim 1, wherein the distance is at least 1 mm. Connecting location or the contact device for the one heating element even without less is applied to the region of the connecting weld line, connecting the welding wire is disposed generally opposite the orifice for the outlet of claim 1 pump.   The pump according to claim 1, wherein the delivery connection part is a separately manufactured structural part and is fixed directly to the jacket by a fixing part.   The pump of claim 6, wherein the delivery connection portion is adhesively bonded directly to the jacket by a securing portion.   The securing part has retaining means, which engages from the outside through the retaining hole in the jacket to secure the delivery connection part to the jacket, the retaining hole being separated from the orifice at a distance of at least 5 mm from the orifice The pump according to claim 6.   7. A pump according to claim 6, wherein the securing means is a latching hook or is configured as a non-releasable rivet joint or the like.   7. A pump according to claim 6, wherein the fixing part presses the outside of the jacket with a certain width by the edge, and a sealing means is provided at this edge.   The sealing means extends near the outer edge of the edge of the fixing means or at a distance of 0.5 mm to 3 mm from the outer edge, surrounds the orifice and extends into the delivery connection part and also surrounds the fixing means of the fixing part on the jacket The pump according to claim 10.   The peripheral sealing means is provided with a peripheral sealing edge on the fixed part, the outer shape of which substantially corresponds to the edge of the orifice of the jacket and has a width of 50% to 150% of the material thickness of the jacket at the peripheral sealing edge. 7. A pump according to claim 6, wherein an outwardly directed groove is provided and the groove depth is equal to at least 100% to 1000% of the jacket thickness.   A perimeter projection having the shape of an orifice is provided on the fixed portion, the perimeter projection projects into the orifice, and the projection of this projection is pressed against the outside of the jacket around the orifice when the projection is fitted into the orifice. The pump of claim 6, wherein a collar on the fixed portion extends around.   The pump of claim 1, wherein the delivery connection is a separately manufactured structural part and compresses against a jacket around the orifice by a sealing means.   15. A pump according to claim 14, wherein the sealing means are provided only on the outside of the jacket and the inner edge of the orifice.   The delivery connection portion has a closed tubular form, the delivery connection portion has an inlet orifice in the region of the delivery connection portion connected to the jacket, and an outlet orifice at the free end, the inlet orifice being the heating element 7. A pump according to claim 6, configured to align with the orifice or shaped identically to the orifice of the heating element.   The delivery connection portion is elongated and has a longitudinal central axis that faces the jacket, the longitudinal central axis extends eccentrically with respect to the jacket, and is approximately 50% to 80% of the radius of the jacket. The pump of claim 1, wherein the amount is directed past the longitudinal central axis of the jacket.   2. The pump according to claim 1, wherein the orifice of the jacket is a long hole with a longitudinal extent in the circumferential direction of the jacket, in particular having an elliptical shape.

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