WO2012028351A1

WO2012028351A1 - Seal for a turbo machine

Info

Publication number: WO2012028351A1
Application number: PCT/EP2011/060516
Authority: WO
Inventors: Rudolf Tungl
Original assignee: Ebm-Papst Landshut Gmbh
Priority date: 2010-08-30
Filing date: 2011-06-22
Publication date: 2012-03-08
Also published as: DE102010035861A1

Abstract

The invention relates to a housing of a turbo machine having an upper part and a lower part, wherein the upper part can be connected to the lower part in a sealing manner and at least one web extending in the direction of the lower part is formed on the upper part, and at least one web extending in the direction of the upper part is formed on the lower part. In the assembled state, the at least one web of the upper part bears on the at least one web of the lower part over a predetermined length in the longitudinal direction in such a way that at least one of the webs is bent elastically in the transverse direction and at least one sealing surface is formed in the area of contact.

Description

Seal of a turbomachine

Description:

The invention relates to a multi-part housing of a turbomachine, in which an upper part is sealingly connectable to a lower part. Furthermore, the invention relates to the use of such a housing in a dishwasher or a condensate pump. State of the art

The provision of blower housings and housings of

Condensate pumps in multi-part training has long been known. Depending on the field of use, it is more or less necessary to connect the components in a sealed manner, so that the medium to be conveyed is conveyed exclusively from the inlet to the outlet, without having to Make medium leaks. The sealing of the connection region is realized variously in the prior art. For example, JP 2010-19078 A discloses the connection of the blower housing parts by means of a tongue and groove joint. JP 5076153 A discloses a blower housing seal in the form of a labyrinth seal 5 in which the flow resistance steadily increases due to the plurality of successively arranged labyrinth passages. The escape of medium can not be safely prevented at high internal pressures. Therefore, the parts of the housing were often connected to each other by additional process steps such as gluing, mirror welding, ultrasonic welding or inserting a Diehl, wherein such connection methods connect the parts inextricably.

The present invention is directed to turbomachines of all kinds. In particular, it is directed, on the one hand, to fan housings for use in dishwashers, in which saturated saturated steam at 70 ° C. is conveyed.

15 has to. Since the wet steam also contains residues of rinse aid and cleaner, special requirements are placed on the seal of the blower housing. The sealing of the blower housing in a dishwasher is also of great importance, since in its surrounding area often electronic components for control or regulation are arranged, which in contact with

20 water or steam can be damaged. On the other hand, the present invention is directed to housing of condensate pumps or the like, which are used for example in tumble driers for conveying the condensate into a collecting container. Again, a secure seal is necessary to prevent leakage.

25 Object of the invention

It is the object of the invention to provide a (vapor) tight, multi-part housing for a turbomachine, which is sealed without additional sealing element and without additional method of connecting the parts to the outside. At the same time the housing should be simple, inexpensive and with be produced and assembled as few manufacturing steps as possible.

These objects are achieved by a housing having the features of claim 1. According to the invention a housing for a turbomachine (blower, pump) is provided with an upper part and a lower part, wherein the upper part is sealingly connected to the lower part and at least one in the direction of the lower part extending web and at the lower part at least one itself on the upper part in the assembled state of the housing, the at least one web of the upper part abuts the at least one web of the lower part over a predetermined length in the longitudinal direction such that at least one of the webs is elastically bent in the transverse direction, so that at least one sealing surface is formed in the adjacent region.

The sealing surface is thus formed by parts of the upper part and parts of the lower part, which extend in such a way that they face each other (longitudinal direction), wherein the lateral contact surface of the parts forms the sealing surface. In the present case, the term "sealing" means that a predetermined pressure can be present in the interior of the housing of the turbomachine without the conveying medium emerging through the seal or the sealing surface Up to 500 Pascals In the case of condensate delivery in a condensate pump, such an internal pressure is up to 15,000 pascal due to the denser medium The very precise positioning of the upper part advantageously connected detachably to the lower part takes place, for example, via an end face of the lower part According to the invention, the upper part is pushed onto the lower part until the respective webs slide along one another and form the sealing surface, without an undercut being provided for fastening must be Non-cutting training ensures clean and easy demolding during injection molding without forced removal. This is particularly advantageous because undercuts could easily leave residues of cleaner or rinse aid which lead to an unclean rinse result. Furthermore, after forming the upper or lower part, the production tool can be pulled straight in the longitudinal direction without lateral slides. The tool design is thus much easier.

If a seal is to be made for high internal pressures (for example 500 Pascal in a blower housing or 15000 Pascal in a condensate pump), several sealing surfaces can be provided. In a preferred embodiment, therefore, the outer wall of the lower part has an outer web on which a further web of the upper part over a predetermined length in the longitudinal direction is applied such that at least one of the webs is bent elastically in the transverse direction and in the adjacent region, a further sealing surface is formed. In this case, the webs of the upper part may be connected via a transverse web in order to ensure a higher elastic resistance. When merging the upper part with the lower part of the webs of the upper part of the webs of the lower part are elastically bent and pressed against each other, whereby two resiliently abutting sealing surfaces are ensured. The forces acting between the webs of the upper part and of the lower part depend directly on the structurally given overlapping of the webs and on the elasticity of the material used. In the assembled state thus creates a bias between the upper and lower part. In a preferred embodiment, a plastic, for example PP GF30, which has hardly any elastic properties, nevertheless ensures high sealing forces in the adjacent area of the webs (sealing surface), can be used as the cost-effective material meeting the requirements.

In a further development of the invention, the upper part may have a wrap-around, which engages over the outer web of the lower part, wherein it may be provided that an outer arm of the wrapper is resiliently biased against the outer web and thus a further sealing surface between outer arm and outer web is formed.

In addition, in the region of the Umgriffs outside means for attachment of the upper part may be provided on the lower part, for example, as

Snap closure are formed. Also, a hook could be provided on the upper part, which engages in a corresponding recess in the lower part to fix the position of the upper part relative to the lower part. In a preferred embodiment, the upper part can be inserted and fixed in the lower part by at least one arranged on the lower part snap hook engages over the upper part in the final assembly position. In an embodiment of the upper part and the lower part with small tolerances and an arrangement of the webs to each other, act in the high forces in the area of the sealing surfaces, can even be dispensed with means such as the tension of the components sufficient to ensure a secure fixation. In a likewise favorable embodiment, a further sealing surface can be formed in that on the upper part an inner web is formed, which abuts on the web of the lower part over a predetermined length in the longitudinal direction such that at least one of the webs is bent elastically in the transverse direction. By forming the inner web adjacent to a longitudinally extending web of the lower part, a sealing surface can be ensured close to the inner region of the housing, which constitutes an additional seal, in particular for high internal pressures. Overall, thus four sealing surfaces can be realized.

In an advantageous embodiment, the elastic bending and thereby achieved resilient arrangement of the webs is realized by a portion of increased thickness on the webs of the base, which extends in a favorable embodiment in the longitudinal direction over a length which represents a quarter to a third of its total length , When assembling the upper part with the lower part, the webs of the upper part are first along a slope ge leads, which lead from the narrower upper portion of the webs of the lower part to the region of increased thickness. In the region of the slope, the webs of the upper part are first on the webs of the lower part and are bent by merging the upper part with the lower part in the transverse direction. The extension of the section of increased thickness only over a length of one quarter to one third of the total length allows a particularly simple assembly of the upper and lower parts, since the adjoining webs in the assembled state webs form their contact surface only when the two components almost are completely merged. On the one hand, incorrect assembly is thus ruled out and, on the other hand, the forces required for the secure positioning of the components are low.

Preferred embodiments of the invention are defined in the subclaims and will become apparent from the following description. Without being limited thereto, exemplary embodiments are explained in more detail with reference to the attached drawings. The exemplary schematic drawings show:

Fig. 1 is a side sectional view of the outer edge region of a housing of a turbomachine in a first embodiment

2 shows a lateral sectional view of the outer edge region of a housing of a turbomachine in a second embodiment; FIG. 3 shows a lateral sectional view of the outer edge region of a housing of a turbomachine in a third embodiment,

Fig. 4 is a side sectional view of the outer edge portion of a housing of a turbomachine in a fourth embodiment.

Fig. 1 shows an inventive housing 1 of a turbomachine with an upper part 2 and a lower part 3 in the lateral cross-section, wherein in each case only a section of the parts is shown. Usually, the housing 1 is in Essentially a spiral housing and has an axial inlet and a tangential outlet. A web 4 extends from the upper part 2 in the longitudinal direction to the lower part 3, wherein, in the assembled state shown, a sealing surface 6 is formed with the web 5, which in the present case is simultaneously configured as an outer web 5 '. The sealing surface 6 extends over a predetermined length L along a portion of the web 5 of increased thickness D. The section of increased thickness D extends longitudinally over a length M of the bottom portion of the base 3, which is one quarter of the total length of the web 5 in Longitudinal corresponds. The web 4 is guided during the pushing together of the upper part 2 with the lower part 3 along a slope 14 and thereby bent in the transverse direction, so that an angle with respect to the upper edge of the lower part of greater than 90 ° arises. This applies generally to all figures and all webs 4, 4 ', 5, even if the drawings show an angle of exactly 90 ° and the bend is not shown in the assembled state. The bending is dependent on the arrangement of the webs 4, 5 to each other and the resulting radial distance of the side surfaces. In the embodiment shown, when the upper and lower parts 2, 3 are brought together, the web 4 hits the bevel 14 and is elastically bent in the transverse direction during the sliding along the web 5, 5 'due to the thickening in the section of increased thickness D. The bend is minimal and barely depicted. The upper part 2 has a wrap-around 8, which surrounds the web or the outer web 5 ', wherein the outer arm 9 of the wrap-around 8 rests on the outer web 5' on the outside and forms a further sealing surface 6 "The outer arm 9 is likewise provided with a bevel The web 4 and the outer arm 9 allow a double seal in the embodiment according to FIG 15 is used for the exact positioning of the upper and lower parts 2, 3rd

In Fig. 2, an alternative embodiment is shown, wherein the upper part 2 a first web 4 and a second web 4 ', which extend in the longitudinal direction to the lower part 3. The lower part 3 forms by the outer web 5 'and the web 5 a kind of circumferential channel into which the webs 4, 4' of the upper part 2 protrude. Both the web 5 and the outer web 5 'have a section of increased thickness D, which extends over a length M in the longitudinal direction, which corresponds in each case to a third of the total length of the respective web. The transition from the upper region to the region of increased thickness D is ensured by bevels 14, on which the webs 4, 4 'of the lower part slide for assembly along and are bent inwards, around the sealing surfaces 6 extending over a length L, L' To ensure 6 '. The webs 4, 4 'are connected via a transverse web 7, which limits the elastic bending substantially to the edge region of the webs 4, 4'. The Umgriff 8 of the upper part 2 engages over the outer web 5, wherein the outer arm 9 of the

Umgriffen of the outer web 5 is spaced. However, it is also possible to bring the outer arm, as shown in Fig. 1, as an additional sealing surface on the outer web 5 'for concern.

FIG. 3 shows a further alternative embodiment in which an inner web 10 is formed on the upper part 2 and bears against the web 5 of the lower part 3 in the longitudinal direction over a predetermined length L "in such a way that the web 5 is elastically bent in the transverse direction is and in the adjacent area, a further sealing surface 6 "'is formed. Furthermore, the wrap-around 8 has on the outside a schematically illustrated fastening means 13 which, for example, can additionally fix the upper part 2 to the lower part 3 as a snap closure. The upper part 2 is in the area of Umgriffe 8 this shaped so that its outer edge is embraced by the trained as a snap hook fastener 13 in the final assembly state and thus fixed. The outer arm 9 of the upper part 2 presses when merging the upper part 2 and lower part 3, the snap hook initially radially outward until the latching takes place as soon as, inter alia, the end face 15 abut each other. Moreover, the characteristics of the web 4 'of the outer web 5' and the respective sealing arrangement agree. tion with those of Figure 1 match.

In Fig. 4, an embodiment is shown with maximum sealing, can be sealed with the internal pressures of more than 500 Pascal for blower housings or up to 15000 Pascal in condensate pumps. In addition to the features already shown and described in FIG. 2, according to FIG. 4, four sealing surfaces 6, 6 ', 6 ", 6"' are provided, each of which adjoins each other by predetermined lengths L, L ', L " Webs 5, 5 ', 4, 4', 10 and the outer arm 9. The outer arm 9 of the surround 8 is arranged to the outer web 5 'such that in the assembled state, the sealing surface 6 "is formed, wherein between the External arm and the outer web 5 'elastic forces act on each other. The sections of increased thickness D of the webs 5, 5 'form with the webs 4, 4' of the lower part, the sealing surfaces 6, 6 ', wherein due to the thickening, the bending occurs substantially at the webs 4, 4' of the lower part 2. The inner web 10, which is further arranged on the lower part 2, abuts the web 5 of the lower part 3 over a predetermined length L "and bends it in the direction of the outer web (a transverse direction) in order to ensure a firm abutment of the webs 5 and 10 Quadruple clamping on the sealing surfaces 6, 6 ', 6 ", 6"' enables a clamping connection of the upper part to the lower part 3 without additional fastening means a loosening of the upper part 2 is avoided by the lower part 3. To save material, the webs 4, 4 'of the upper part 2 are connected only by the web 7. The webs 4, 4' can be made very thin in spite of the high temperatures in dishwashers in the transverse direction, since the web 7 ensures sufficient support and contact pressure on the webs 5, 5 'of the lower part 3.

Each of the embodiments shown forms an undercut-free, sealing of the upper and lower parts 2, 3, wherein the seal is formed exclusively by adjoining parts / webs of the upper and lower parts 2, 3 itself. Forced removal is therefore not required. The invention is not limited in its execution to the embodiments shown above. Rather, a number of variants are conceivable which make use of the illustrated solution even in fundamentally different embodiments and are also within the scope of protection of the invention. Thus, it is possible, for example, in addition to the clamping connection to use a fastening means according to Figure 3 in all other figures. In principle, all disclosed features can be integrated as desired into each of the illustrated exemplary embodiments, as far as this is technically possible. Alternatives such as a kinematic reversal, ie, the formation of the sections of increased thickness D to be arranged on the webs of the upper part and the webs of the lower part to perform accordingly along sliding along, are also covered by the protection.

In the figures, like reference numerals designate like components, so that each component having the same reference number has the same properties and features in each embodiment.

_* * * * *

Claims

claims

1. Housing a turbomachine with an upper part (2) and a lower part (3), wherein the upper part (2) is sealingly connectable to the lower part (3) and on the upper part (2) at least one in the direction of the lower part (3) extending web (4) and on the lower part (3) at least one in the direction of the upper part (2) extending web (5) is formed, wherein in the assembled state of at least one web (4) of the upper part (2) on the at least one Web (5) of the lower part (3) over a predetermined length (L) in the longitudinal direction such that at least one of the webs (4, 5) is elastically bent in the transverse direction and in the adjacent region at least one sealing surface (6) is formed.

2. Housing according to claim 1, characterized in that the upper part (2) and the lower part (3) sealed against each other are sealed fastened.

3. Housing according to at least one of the preceding claims, characterized in that the outer wall of the lower part (3) forms an outer web (5 '), on which a further web (4') of the upper part (2) over a predetermined length (L ' ) in the longitudinal direction so that at least one of the webs (4 ', 5') is elastically bent in the transverse direction and in the adjacent region, a further sealing surface (6 ') is formed.

4. Housing according to at least one of the preceding claims, characterized in that the webs (4, 4 ') via a transverse web (7) are connected.

5. Housing according to at least one of the preceding claims, characterized in that the upper part (2) has a wrap (8), which surrounds the outer web (5 ').

6. Housing according to at least one of the preceding claims, characterized in that the wraparound (8) has an outer arm (9), which bears resiliently biased on the outer web (5 ') and forms a further sealing surface (6 ").

7. Housing according to at least one of the preceding claims, characterized in that the wraparound on the outside means (13) for fixing the upper part (2) with the lower part (3).

8. Housing according to at least one of the preceding claims, characterized in that on the upper part (2) an inner web (10) is formed on the web (5) of the lower part (3) over a predetermined length (L ") in the longitudinal direction is present in such a way that at least one of the webs (10, 5) is bent elastically in the transverse direction and in the adjacent region, a further sealing surface (6 "') is formed.

9. Housing according to at least one of the preceding claims, characterized in that the web (5) and / or the web (5 ') has a portion of increased thickness (D) / s, along which the sealing surfaces (6, 6 ') extend at least in sections.

10. Housing according to the preceding claim, characterized in that the transition to the section of increased thickness (D) in the longitudinal direction by a slope (14) is formed, which guides the webs (4, 4 ', 10).

11.Body according to at least one of the preceding claims, characterized in that the section of increased thickness (D) extends in the longitudinal direction over a length (M) which is a quarter to a third of the total length of the respective web (5, 5 ') ,

12. Housing according to at least one of the preceding claims, characterized in that the upper part (2) and the lower part (3) by the sealing surfaces (6, 6 ', 6 ", 6'") are clamp-connected.

13. Housing according to at least one of the preceding claims, characterized in that the upper part (2) and the lower part (3) made of plastic PP GF30.

14. Housing according to at least one of the preceding claims, characterized in that the upper part (2) and the lower part (3) are detachably fastened together.

15. Use of the housing (1) according to at least one of the preceding claims in a dishwasher or a condensate pump.