Pump and household appliance having such a pump

Abstract

Pump for a washing machine, comprising a pump chamber with an inflow, an outflow and a pump chamber bottom, an impeller for guiding water in the pump chamber and optionally a plurality of guide vanes radially outside the impeller, which vanes are stationary and extend helically towards the pump chamber bottom. The pump is designed in the form of a centrifugal pump. According to the invention, at least one curved or bent guide vane is arranged on at least one guide vane or on a support ring below the impeller.

Description

[0001] Technical Field and Background Technology

[0002] This invention relates to a pump, particularly suitable for installation in household appliances for water diversion, such as dishwashers or washing machines. The invention also relates to such household appliances. The pump has a pump chamber with an impeller located therein and guide vanes extending radially outward from the impeller, having a helix angle. The guide vanes are designed to optimize water flow within the pump chamber, downstream of the impeller, or to influence water flow in a desired manner.

[0003] A pump with this type of guide vanes is known from EP 2495444 A2. These guide vanes extend upward from the impeller outlet in a direction toward the inlet portion entering the pump chamber, since the outlet portion from the pump chamber is also arranged or positioned in this direction.

[0004] Another type of pump for water-conducting household appliances is known from WO 2014 / 198427 A1. Summary of the Invention

[0005] The object of this invention is to provide the pump described at the beginning and a household appliance equipped with the pump, which can solve the problems of the prior art, and in particular optimize the flow rate of water flowing out or spraying from the impeller within the pump chamber, especially removing air bubbles from the pump chamber as quickly as possible once the pump has been running dry. These air bubbles can remain in the pump chamber for a relatively long time, forming a tube or chain, impairing pump efficiency and, most importantly, generating unwanted noise.

[0006] This objective is achieved by a pump having the features of claim 1 or 13 and by a household appliance having the features of claim 19 and incorporating such a pump. Advantageous and preferred embodiments of the invention are the subject of the dependent claims and are set forth in more detail below. Some features are described only with respect to one type of pump or only with respect to a household appliance incorporating such a pump. However, they are intended to be applicable independently and individually to both such pump and household appliance incorporating such pump. The wording of the claims is expressly incorporated into the description by reference.

[0007] The pump has a pump chamber with an inlet, an outlet, and a bottom. At the bottom of the pump chamber, the direction of the water can be reversed 180° relative to the longitudinal direction of the pump, or alternatively reversed 90° to the side, i.e., towards the outlet. The inlet is advantageously centrally located, as is common for centrifugal or impeller pumps. The outlet is advantageously externally positioned in the radial direction or extends parallel to the radial direction. Advantageously, an impeller driven by a pump motor rotates within the pump chamber to convey water inside the pump chamber, specifically from the inlet to the outlet. The impeller extends above the bottom of the pump chamber, advantageously at a distance from it, particularly advantageously between 20% and 120% of the diameter of the outer wall of the pump chamber.

[0008] In a first fundamental improvement of the invention, as explained at the outset, one or more guide vanes are provided, arranged radially outward of the impeller. This allows them to guide or direct water exiting or ejected from the impeller as directly as possible in the desired direction and manner, preferably toward the bottom of the pump. The guide vanes are fixedly arranged and extend helically in a known manner, having a lift angle extending toward the bottom of the pump chamber along the direction of impeller rotation, wherein they extend at least partially circumferentially around the impeller, i.e., preferably only along the pitch circle. This allows water exiting the impeller to be rapidly and efficiently conveyed toward the bottom of the pump chamber, and thus to an outlet arranged near the bottom of the pump chamber. Therefore, the pump is designed as an impeller pump or centrifugal pump, centrally and axially drawing water through the inlet. It also conveys water radially outward through the outlet.

[0009] According to the invention, at least one so-called guide vane is arranged at or on at least one guide vane. The guide vane is curved or may be arched, and its extension causes it to at least partially project from the guide vane in the axial direction of the pump, i.e., it is practically positioned or mounted on the guide vane, advantageously being integral and one-piece. Such a guide vane can form a small wing and influence turbulence in the pumped water, particularly causing the removal of air bubbles as described above. The guide vane can advantageously be thin, particularly having an average thickness between 70% and 120% of the guide vane. In another embodiment of the invention, the guide vane can be curved or arched in a manner similar to the pump cavity, or curved or arched with a curvature corresponding to the curvature of the pump cavity in the region, whether in a parallel or concentric orientation. Such a guide vane can be particularly advantageously arranged radially outside the impeller and at an axial height above the impeller outlet, so that the guide vane can guide the water flowing out of the impeller particularly effectively at that point. The guide vane can optionally guide the water even more strongly toward the guide vane in order to apply the desired direction to the flowing water particularly strongly.

[0010] The present invention can improve pump efficiency. In water-conducting household appliances equipped with this pump, more efficient pumping can be achieved due to the guide vanes, and when water must be pumped again, air can be removed from the previously empty pump chamber more quickly using the guide vanes.

[0011] A pump can consist of a pump assembly and an electric drive motor; these together form a pump. The entire water guiding system is housed within the pump assembly. The drive motor rotates only the impeller within the pump chamber.

[0012] Advantageously, at least one guide vane is arranged on the side of the guide vane facing away from the bottom of the pump chamber and / or on the side facing the inlet portion entering the pump chamber. Thus, the guide vane at least partially covers the impeller from the guide vane upwards, particularly in the radial direction. Therefore, when air or bubbles exit from the impeller, the guide vane is able to capture and remove the air or bubbles in an optimal manner.

[0013] In one embodiment of the invention, at least one guide vane may be disposed on a circumferential support ring or between the impeller and the bottom of the pump chamber. The support ring is advantageously arranged substantially below the impeller such that it does not reach the impeller in the axial direction, let alone overlap with it. Preferably, the support ring may be arranged below the impeller at a maximum distance of 10 mm, and in particular, it may be designed and / or arranged to directly abut the impeller in the axial direction. The diameter of the support ring may preferably be 80% to 120% of the impeller diameter, or even 90% to 110%. Both (support ring and impeller) are particularly preferably of the same diameter, in which case possibly optimal water flow can be achieved.

[0014] In an advantageous improvement to the first feature described above, at least one guide vane, and advantageously the lift angle of all guide vanes can be 80% to 120% of the diameter of the outer wall of the pump cavity, particularly advantageously 90% to 110%.

[0015] In one improvement of the invention, at least one guide vane may have a leading edge that extends substantially parallel to, and particularly precisely parallel to, the axis of rotation of the impeller, against the water flow induced by the impeller within the pump chamber, or is slightly inclined. Water first reaches this leading edge in the circumferential direction of the guide vane.

[0016] Alternatively, at least one guide vane may have a leading edge arranged or mounted on the front of the support ring, on which the guide vane is arranged or formed radially outward. The starting or foremost region of the guide vane may also be arranged on the same front of the support ring, adjacent to the leading edge, i.e., not yet on the guide vane. The guide vane may begin on the front of the support ring in a plane extending therein, but subsequently radially outward adjacent to the support ring.

[0017] In a first possibility of the invention, the upper edge of the guide vane may extend at an angle between 2° and 20° relative to the side of the guide vane on which the guide vane is arranged. The axial height of the guide vane extending in a direction parallel to the axis of rotation of the impeller preferably remains approximately the same or varies by only a maximum of 10% or 15%. Thus, the guide vane has approximately the same lift angle as the guide vane.

[0018] In a second possibility of the invention, the upper edge of the guide vane may extend at an angle between 80° and 90° relative to the axis of rotation of the impeller, thereby increasing the axial height of the guide vane extending in a direction parallel to the axis of rotation of the impeller. The upper edge of the guide vane may advantageously extend at a right angle to the axis of rotation of the impeller.

[0019] In another improvement of the invention, the trailing edge of the guide vane, opposite the leading edge, may extend obliquely relative to the leading edge at an angle between 10° and 50°. This is preferred for rectangular guide vanes. The guide vane contacts or connects to the guide vane with one edge, particularly forming integrally with it.

[0020] In another improvement of the invention, at least one guide vane does not extend precisely along a circular path about the axis of rotation of the impeller, but instead begins with the aforementioned leading edge on a smaller circular path about the axis of rotation of the impeller and with a shorter radial distance compared to the subsequent portion toward the trailing edge. In this way, the radial distance from the guide vane to the axis of rotation of the impeller can increase from the leading edge to the trailing edge, i.e., the distance between the guide vane and the impeller can thus become larger.

[0021] The guide vanes can be advantageously positioned at the beginning of the guide vanes or only up to 10 mm behind them. Preferably, only one guide vane is provided for each guide vane.

[0022] Advantageously, the guide vane can have 70% to 110% of the length of the guide vane along the helical direction of the guide vane, preferably 80% to 100%. As an absolute length, this can be between 35 mm and 55 mm.

[0023] In another improvement of the invention, the guide vane may extend primarily or at least behind, preferably in a front region corresponding to 10% to 25% of the length, along or near the outer edge of the guide vane. Thus, the section formed by the guide vane and the guide vane can form an angle, advantageously between about 80° and 100°.

[0024] In a first improvement of the invention, the leading region of the guide vane may be adjacent to the leading edge of at least one guide vane, and both the leading edge and the leading region point generally radially toward the axis of rotation of the impeller. The guide vane then curves sharply inward at its leading edge. This is ideal for capturing air from the impeller. The pump efficiency is slightly impaired, but not severely.

[0025] In another, second improvement of the invention, the aforementioned leading region of the guide vane may be adjacent to the leading edge of at least one guide vane, and the leading edge and the leading region here point generally in a circumferential or tangential direction. Advantageously, the guide vane then extends generally in an arc, which does not necessarily have its center point located on the axis of rotation of the impeller. This ensures very high pump efficiency and impairs, but not severely impairs, the trapping of air from the impeller.

[0026] In another improvement of the invention, the leading edge or foremost point of the guide vane can have a maximum distance of 10% of the guide vane length from the leading region of the guide vane, preferably only 5% of the maximum distance. This means that the guide vane is mounted on and / or begins at a very forward position on the guide vane. Therefore, it is quite high and thus close to the impeller.

[0027] In another fundamental improvement of the invention, instead of guide vanes, the pump again has an inlet, an outlet, and a pump chamber bottom, and an impeller for conveying water within the pump chamber, wherein the impeller extends above the bottom of the pump chamber. A circumferential support ring is provided between the impeller and the bottom of the pump chamber, wherein the support ring is substantially arranged below the impeller. The pump with the impeller is again designed to function as a centrifugal pump, and has a centrally axial suction of water to be conveyed through the inlet and a radial discharge of water to be conveyed through the outlet.

[0028] According to the invention, at least two curved guide vanes are arranged on the support ring, wherein these guide vanes extend from their respective leading edges with a radial distance that gradually increases from the axis of rotation of the impeller. No guide vanes are provided here, such that the curvature or arching, preferably convex, of the guide vanes simultaneously fulfills the aforementioned function of guiding the liquid as directly as possible, in the desired direction, and / or in the desired manner, to the bottom of the pump. By omitting the guide vanes, the resistance in the pump can be reduced, and the pump construction can be simplified.

[0029] In another improvement to the invention, all guide vanes can be designed to be identical. This applies to both fundamental improvements to the invention.

[0030] In another improvement of the invention, at least two guide vanes may be designed to be bent or arched in two directions. They are preferably each designed to be bent or arched away from the axis of rotation of the impeller.

[0031] Advantageously, a number of guide vanes, preferably six to ten, can be arranged on the aforementioned support ring. These guide vanes can preferably be evenly distributed and arranged in the same manner on the support ring. Their effect on the water being transported is therefore the same in every case.

[0032] These guide vanes can be designed to be shorter than the individual guide vanes arranged on the guide vanes. Therefore, they can also extend with a much larger angle relative to the circumferential direction. Their leading edges, together with the adjacent front regions, can point radially or at a maximum angle of 20° or 10° relative to the circumferential direction. In the central region, they can have an angle between 30° and 60° relative to the circumferential direction. Near or within this central region, the guide vanes can protrude from the support ring, i.e., extend freely from the support ring.

[0033] The end regions of the guide vanes, in which they advantageously extend freely, can have a maximum angle of 20° or 10° relative to the circumferential direction. Thus, the guide vanes extend circumferentially or almost circumferentially at their ends, such that the guide vanes release the water flowing along them at that point in a manner that guides them as circumferentially as possible.

[0034] In one embodiment of the invention, a guide vane is arranged in the central region at half the height of the guide vane, wherein the length of the guide vane can be between 10% and 30% of the length of the guide vane, i.e., it is shorter than the guide vane. Here, the leading edge of the guide vane is either arranged in front of the support ring and has a smaller radial distance to the axis of rotation of the impeller than the guide vane, or it is arranged on the guide vane itself, which is radially externally arranged on the support ring. Guide vanes of this embodiment can be provided regardless of the presence of the guide vane.

[0035] It is possible that the guide vanes do not overlap each other in the circumferential direction around the impeller, or that the guide vanes are spaced apart from each other. Therefore, the flow resistance will not increase too much.

[0036] It can be generally stipulated that all guide vanes be evenly distributed. This ensures uniform guidance of water.

[0037] Advantageously, at least one guide vane, and preferably all guide vanes, can be arranged at least partially at the axial height of the impeller outlet and radially outward. A portion of the guide vane can be arranged below the impeller towards the bottom of the pump chamber; in particular, this is a large portion of the guide vane or more than half of its length and / or surface area. This results in particularly good guidance of the pumped water.

[0038] In an advantageous embodiment, the outlet can be drawn out of the pump chamber above the bottom of the pump chamber, particularly advantageously along the longitudinal direction of the pump, at a distance of 1 mm to 20 mm. The impeller can preferably be arranged directly downstream of the inlet, for example, internally adjacent to the inlet.

[0039] The axial length of the pump chamber can be between 70% and 200% of its diameter, preferably between 80% and 160%. Accordingly, the pump chamber is neither particularly long and thin nor compressed and flat.

[0040] In another improvement of the invention, exactly two or exactly three guide vanes may be provided. This is considered sufficient for favorable water guidance. Preferably, one or all guide vanes are designed to be identical. Additionally or alternatively, they may be arranged uniformly around the impeller.

[0041] The household appliance according to the invention has the aforementioned pump and a processing chamber with a chamber discharge port, wherein the pump is arranged downstream of the chamber discharge port. Advantageously, the household appliance is a dishwasher or washing machine, i.e., a water-conducting household appliance.

[0042] These and further features are disclosed in the specification and drawings and in the claims, wherein each feature may be implemented individually or in combination in one embodiment of the invention and in other fields, and may represent advantageous and self-protectable embodiments, which are claimed herein. The division of this application into sections and subheadings does not limit the general validity of the statements made herein. Attached Figure Description

[0043] Examples of the invention are schematically illustrated in the accompanying drawings and explained in more detail below. In the drawings: Figures 1 to 3 A first embodiment of a pump according to the invention is shown in side view, front view, and oblique view, the pump having guide vanes and guide vanes. Figures 4 to 15 Four additional variations of the pump according to the invention, with guide vanes and guide blades, are shown in side, front, and oblique views. Detailed Implementation

[0044] Figures 1 to 15 Five examples of pumps according to the invention are shown, each illustrated in a side view, front view, and oblique view. All views are partial sectional views or pump components partially cut in half from the front. The first pump 11a according to the invention... Figures 1 to 3 A more detailed overall description is provided, as can be seen. Other pumps are described only with respect to their differences or embodiments of the guide vanes and / or guide blades and their specific features. The same reference numerals identify the same parts, with different lowercase letter suffixes to distinguish the various variations of the examples.

[0045] according to Figures 1 to 3According to a first embodiment of the invention, the pump 11a has a drive motor 13a at its rear, and a pump component 15a is fastened to the front of the drive motor 13a. The drive motor 13a is not the focus of this invention; the pump component 15a is only partially of interest. At the front, the pump 11a has a centrally located and axially oriented inlet 17a formed inside the pump cover 18a. At the rear of the pump component 15a and in front of the drive motor 13a, an outlet 19a protrudes radially or tangentially and is designed as a pipe fitting similar to the inlet 17a.

[0046] Pump chamber 21a is located in pump component 15a and has a pump chamber bottom 23a, with an inner dome 24a protruding centrally above the pump chamber bottom 23a. Pump chamber 21a is defined radially outward by pump chamber wall 25a, which is designed here as a metal and annular heating element with an external thick-film heating element.

[0047] Impeller 28a is designed in a conventional manner and is located or mounted on inner dome 24a. Impeller 28a has an impeller inlet 29a directly adjacent to inlet section 17a. Radially outward, impeller 28a has multiple impeller outlets 31a, each subdivided or separated from each other by inclined impeller blades 32a. In frontal and oblique views, impeller 28a rotates counterclockwise. So far, all examples of pump 11 are identical.

[0048] A circumferential support ring 35a is disposed on the outer side of the inner dome 24a and axially positioned below or at a short distance from the impeller 28a, preferably 0.5 mm to 5 mm. In some cases, the support ring 35a may also be designed as a single piece or integral unit with the inner dome 24a. Four equally sized and evenly distributed guide vanes 36a are formed on the outer side of the support ring 35a. Figure 1 As shown in the side view, they protrude generally radially from the support ring 35a, but are inclined forward toward the pump cover 18 at an angle between 5° and 10° relative to the radial direction. The guide vanes extend in a helical form on an arc of approximately 80°, so that they do not overlap, as... Figure 2 The front view is shown. Each of them has a starting portion 38a and a ending portion 39a, which are designed to be inclined, i.e., not extending in the radial direction. Between the starting portion 38a and the ending portion 39a, they have an outer edge 40a, which may, but is not required, extend along an arc around the axis of rotation of the impeller 28a. Figure 1 and 2 It is clearly shown that water circulates in a counterclockwise annular manner inside the pump chamber 21a, and is thus transported in a spiral manner to the bottom 23a of the pump chamber via the guide vanes 36a. Therefore, these guide vanes 36a are primarily used to ensure or improve the efficiency of the pump 11a.

[0049] Guide vanes 43a are arranged on the upper side 41a of each guide vane 36a, preferably integrally formed with the guide vane. The four guide vanes 43a have a length approximately the same as that of the guide vane 36a, at least along their respective outer edges 40a. Each guide vane 43a has a leading edge 45a extending straight and almost parallel to the axis of rotation of the impeller 28a, and a front region 44a adjacent to the leading edge 45. An upper edge 46a extending to a trailing edge 47a abuts the front region. This trailing edge 47a may also subsequently extend approximately parallel to the axis of rotation of the impeller 28a. The guide vanes 43a shown here are curved inward in the front region 44a slightly more tightly than the arc around the axis of rotation of the impeller 28a, along which the guide vanes 43a extend primarily. Figure 2 The front view specifically shows the front region 44a curving slightly inward, but not very far. In this front region 44a, or the front region 44a with the leading edge 45a, guide vanes 43 capture (intercept) air bubbles from the water flow directly from the impeller 28 or the impeller outlet 31a. Thus, guide vanes 43a are primarily used to remove air bubbles or air more quickly from the pump 11a or its pump chamber 21a.

[0050] like Figure 1 As shown in the side view, the guide vane 43a is at a roughly constant height above the upper side 41a of the guide vane 36a. Therefore, the trailing edge 47a has a roughly uniform height above the upper side 41a.

[0051] Figures 4 to 6 The second pump 11b according to the invention is shown, which differs only in the design of the guide vane 43b on the guide vane 36b at the support ring 35b, within the pump chamber 21b. The guide vane 36b itself is identical. Three views show that the guide vane 43b here also has a front region 44b with a leading edge 45b, an upper edge 46b, and a trailing edge 47b at the termination. Here, the leading edge 45b and the trailing edge 47b are also designed to be substantially parallel to the axis of rotation of the impeller 28b. Furthermore, the guide vane 43b here also has a substantially uniform height, such that the trailing edge 47b extends at approximately the same distance as the upper side 41b.

[0052] Unlike pump 11a, in pump 11b, the guide vane 43b is strongly radially inwardly curved in the front region 44b. The foremost region at the leading edge 45b points almost radially toward the axis of rotation of the impeller 28b, causing the guide vane 43b to bend very strongly inwardly here. As a result, the leading edge 45b is closer to the impeller 28b than in pump 11a. It can actually be designed to overlap in front of the inner dome 24b. Due to this strong inward curvature of the front region 44b and the short distance to the impeller 28b or its impeller outlet 31b, air bubbles can be captured and removed very directly and very well. This greatly reduces the venting time of pump 11b, thus removing air very quickly. At the same time, the strongly inwardly curved front region 44b presents a slightly greater flow resistance to the circulating water, resulting in a slight decrease in the efficiency of pump 11b. As another specific feature of pump 11b, the guide vane 43b is designed to be slightly thinner than that in pump 11a.

[0053] Figures 7 to 9 A third pump 11c according to the invention is shown. (As shown) Figure 8 The front view is shown first, and its design of the guide vanes 43c on the guide vane 36c is very similar to that of the pump 11b. A specific feature here is that the height of the guide vanes 43c increases along their orientation on the upper side 41c of the guide vane 36c, and each guide vane 43c thus becomes higher towards its trailing edge 47c. The increase in height is approximately 70% to 80%. Furthermore, Figure 7 The side view shows that the upper edge 46c of the guide vane 43c extends in a plane perpendicular to the axis of rotation of the impeller 28c.

[0054] Figure 8 The front view shows that the front region 44c, together with the leading edge 45c, curves strongly inward again, as described above regarding... Figure 5 The increased height of the guide vanes 43c along their orientation allows for improved air removal from the pump chamber 21c. Furthermore, as described... Figure 4 and 7 As the comparison shows, this ensures that the water ejected from the impeller 28c does not directly impact the pump chamber wall 25c, but is always effectively collected by the guide vane 43c and guided in the aforementioned spiral form.

[0055] It is clear from pump 11c that Figures 1 to 3 The guide vane 43a of the intermediate pump 11a can also be designed in this way to have an increased height. Finally, the design of this height is independent of how the front region 44 of the guide vane 43 extends.

[0056] Figures 10 to 12The fourth pump 11d according to the invention is shown. Four guide vanes 36d are formed here on a support ring 35d on an inner dome 24d. Each of the four guide vanes 36d has a starting portion 38d, a terminating portion 39d, and an outer edge 40d extending therebetween, as well as an upper side 41d. They are again designed to improve the efficiency of the pump in terms of throughput.

[0057] Guide vanes 43d are also provided in pump 11d; however, unlike the guide vanes of pumps 11a to 11c, guide vanes 43d are not mounted on guide vanes 36d. For example... Figure 10 As shown in the side view, the guide vane 43d is always a distance, even a small distance, from the guide vane 36d, and especially from their upper side 41d.

[0058] The number of guide vanes 43d is twice that of guide vanes 36d, that is, there are eight guide vanes 43d. Each guide vane 43d is approximately arranged in the middle region between two guide vanes 36d and within half the length of the guide vane. All guide vanes 43d are designed identically. They have a leading edge 45d, an upper edge 46d, and a trailing edge 47d. Figure 10 The side view shows that all the upper edges 46d are similar Figure 7 The upper edge of the guide vane 43c extends in a plane perpendicular to the axis of rotation of the impeller 28d. Meanwhile, the guide vanes 43d change their height only slightly along their generally relatively short course, decreasing slightly towards the trailing edge 47d. This is because each lower edge 48d is slightly pulled upwards in its longitudinal direction, i.e., towards the inlet section 17d.

[0059] The guide vanes 43d are generally uniformly curved, with slight taper towards the leading edge 45d and the trailing edge 47d. Their anterior region 44d is similar to... Figure 7 Pumps 11b are generally oriented radially toward the axis of rotation of impeller 28d. Their radial distance to impeller 28d is also relatively short.

[0060] Therefore, in this version of pump 11d with guide vanes 43d, the guide vanes 43d are effectively independent of and separately designed from the guide vanes 36d. Furthermore, they are very effective at removing air bubbles from the pump chamber 21d. Due to their relatively inclined position compared to the circulating pumped water, they significantly reduce or worsen the efficiency of pump 11d. However, they are very effective during venting, removing air very quickly. Moreover, the increased flow resistance due to the short length of the guide vanes 43d is reduced.

[0061] Figures 13 to 15Another pump 11e is shown, which has no guide vanes at all. Similar to the guide vanes 43d of pump 11d, eight guide vanes 43e are provided here, arranged precisely at the top of the inner dome 24e, below the impeller 28e, and radially outward therefrom. The guide vanes 43e have a leading edge 45e, which is very close to the impeller 28a or its impeller outlet 31e. The leading edge 44e also points generally radially toward the axis of rotation of the impeller 28e. The guide vanes 43e have an upper edge 46e adjacent to the leading edge 45e, which extends at a more oblique angle relative to the axis of rotation of the impeller 28e than in other embodiments. The trailing edge 47e also extends obliquely outward and almost extends into the inner dome 24e. It can be seen from... Figures 10 to 12 Starting with pump 11d, the guide vane 43e is designed to perform both the function of a helical surrounding guide vane and the function of a guide vane extending at an angle relative to the flow direction—that is, both functions are performed simultaneously. Because the front region 44e with its leading edge 45e extends radially very close to the impeller 28e or its impeller outlet 31e, air bubbles can be collected and then removed or carried away very quickly. The overall arched shape, and also the curvature of the guide vane 43e towards the trailing edge 47e into a slightly flatter region, achieves the function of a helical or spiral surrounding guide vane for improving water flow.

Claims

1. A pump, particularly for use in household appliances such as dishwashers or washing machines, wherein said pump has: - A pump chamber, which has an inlet, an outlet, and a bottom. - An impeller for conveying water inside the pump chamber, wherein the impeller extends above the bottom of the pump chamber. - One or more guide vanes, said one or more guide vanes being radially outside the impeller, said one or more guide vanes being fixedly arranged and extending at least partially around the impeller in a helical manner, having a lift angle extending in the direction of rotation of the impeller toward the bottom of the pump chamber. in, The pump with the impeller is designed to function as a centrifugal pump, which has a centrally axial suction of water to be pumped through the inlet and a radial discharge of the water to be pumped through the outlet. in: - At least one guide vane is arranged on the at least one guide vane, wherein the at least one guide vane is curved and protrudes at least partially from the guide vane in the axial direction of the pump.

2. The pump according to claim 1, characterized in that, The at least one guide vane is arranged on the side of the guide vane away from the bottom of the pump chamber and / or on the side facing the inlet portion entering the pump chamber.

3. The pump according to claim 1 or 2, characterized in that, The at least one guide vane has a leading edge that extends substantially parallel to the axis of rotation of the impeller, and / or has an upper edge that extends at an angle between 70° and 110°, preferably between 80° and 100°, relative to the axis of rotation of the impeller.

4. The pump according to any one of the preceding claims, characterized in that, The at least one guide vane has a leading edge disposed on the front of the support ring, the guide vane being disposed radially outward on the support ring, wherein preferably the starting portion or foremost region of the guide vane is disposed on the same front of the support ring, wherein in particular the guide vane begins on a plane extending therein on the front of the support ring.

5. The pump according to any one of the preceding claims, characterized in that, The upper edge of the guide vane extends at an angle between 2° and 20° relative to the side portion of the guide vane on which the guide vane is arranged, wherein the axial height of the guide vane in a direction parallel to the rotation axis of the impeller is preferably the same.

6. The pump according to any one of claims 1 to 4, characterized in that, The upper edge of the guide vane extends at an angle between 80° and 90° relative to the axis of rotation of the impeller, thereby increasing the axial height of the guide vane in a direction parallel to the axis of rotation of the impeller, wherein preferably the upper edge of the guide vane extends at a right angle to the axis of rotation of the impeller.

7. The pump according to any one of the preceding claims, characterized in that, The at least one guide vane does not extend precisely along a circular path about the axis of rotation of the impeller, but rather the leading edge of the guide vane has a shorter radial distance to the axis of rotation of the impeller compared to the subsequent portion of the guide vane up to the trailing edge, wherein preferably the radial distance of the guide vane to the axis of rotation of the impeller increases from the leading edge to the trailing edge.

8. The pump according to any one of the preceding claims, characterized in that, The at least one guide vane has 70% to 110%, preferably 80% to 100% of the length of the guide vane along the helical direction of the guide vane.

9. The pump according to any one of the preceding claims, characterized in that, The leading edge of at least one guide vane has a maximum distance of 10% of the length of the guide vane from the front region of the guide vane, preferably a maximum distance of 5% of the length of the guide vane.

10. The pump according to any one of the preceding claims, characterized in that, The front region of the guide vane is adjacent to the leading edge of at least one guide vane, wherein the leading edge and the front region point radially toward the axis of rotation of the impeller.

11. The pump according to any one of claims 1 to 9, characterized in that, The front region of the guide vane is adjacent to the leading edge of the at least one guide vane, wherein the leading edge and the front region point in a circumferential or tangential direction.

12. The pump according to any one of the preceding claims, characterized in that, The guide vane is arranged in the middle region of the guide vane, wherein the length of the guide vane is preferably between 10% and 30% of the length of the guide vane, wherein in particular the leading edge of the guide vane is arranged in front of the support ring and has a smaller radial distance to the axis of rotation of the impeller than the guide vane, and the guide vane is arranged radially outward on the support ring.

13. A pump, particularly for use in household appliances such as dishwashers or washing machines, wherein said pump has: - A pump chamber, which has an inlet, an outlet, and a bottom. - An impeller for conveying water inside the pump chamber, wherein the impeller extends above the bottom of the pump chamber. - A circumferential support ring, the circumferential support ring being located between the impeller and the bottom of the pump chamber, wherein the support ring is substantially disposed below the impeller. The pump, which includes the impeller, is designed to function as a centrifugal pump, having a centrally axial suction of water to be pumped through the inlet and a radial discharge of the water to be pumped through the outlet. in: - At least two curved guide vanes are arranged on the support ring. - The guide vanes extend from their respective leading edges at a radial distance that gradually increases from the axis of rotation of the impeller.

14. The pump according to claim 13, characterized in that, All of the guide vanes are designed to be identical.

15. The pump according to claim 13 or 14, characterized in that, The at least two guide vanes are designed to be bent or arched in two directions. Preferably, each of the at least two guide vanes is designed to be bent or arched away from the axis of rotation of the impeller.

16. The pump according to any one of claims 13 to 15, characterized in that, Six to ten guide vanes are arranged on the support ring, preferably evenly distributed and arranged in the same manner on the support ring.

17. The pump according to any one of the preceding claims, characterized in that, The guide vanes do not overlap each other in the circumferential direction around the impeller, or the guide vanes are spaced apart from each other in the circumferential direction, wherein preferably all the guide vanes are evenly distributed.

18. The pump according to any one of the preceding claims, characterized in that, At least one of the guide vanes, preferably all of the guide vanes, are arranged at least partially radially outside the outlet of the impeller and at an axial height, wherein a portion of the guide vanes is preferably arranged below the impeller toward the bottom of the pump chamber, particularly a larger portion of the guide vanes.

19. A household appliance, preferably a dishwasher or a washing machine, the household appliance having a pump according to any one of the preceding claims, wherein the household appliance has a processing chamber and a chamber outlet from the processing chamber, wherein the pump is disposed downstream of the chamber outlet.

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