MXPA01003655A - Flap mechanism - Google Patents

Abstract

The invention relates to a flap mechanism which comprises means for compensating tolerances and the shrinkage behavior of the flap (11). These means exist primarily by the provision of a flap edge (14) which is connected by injection molding after the injection molded flap (11) has cooled, and thus reduces the gap between the flap (11) and the flap frame (10), said gap being produced by the shrinkage of the flap. In addition, the mounting of the shaft (12) in the frame (10) can be realized in an at least partially conical manner, whereby the shrinkage behavior of the flap shaft can be used, especially in an axial direction, in order to produce a mounting which is free of play. As a result, it is no longer necessary to use additional sealing elements on the mounting points of the flap. In addition, the flap is prevented from vibrating in the mounting which, in the worst case scenario, could lead to a destruction of the flap.

Description

Butterfly Valve Mechanism STATE OF THE ART The present invention relates to a butterfly valve mechanism, particularly an injection molded butterfly valve in the assembled state, according to the exordium of claim 1. Injection molded butterflies valves are known by way of example from EP 482 272. The butterfly valves are manufactured together with their box in the form of a frame in two stages in a molding tool. In the first stage, the box is molded in the form of a frame, the slots introduced in different directions occupying the volume provided for the butterfly valve. Said slides are partly removed for the second stage of the process so that the butterfly valve can be injection molded in the volume that is now free. The walls of the mold for the butterfly valve are formed partly by the slides and partly by the walls of the frame-shaped box of the butterfly valve. The plastic component materials for the butterfly valve have been selected, however, so that they do not adhere to the plastic of the butterfly valve box. After cooling, the butterfly valve of the injection molding tool is detached and can be supplied for final application without subjecting the valve to further processing. Due to the shrinkage of the injection-molded butterfly valve during cooling, however, there is a certain play between the throttle valve and the frame-shaped housing, as well as between the throttle valve shaft and the throttle valve housing. shape of frame. This measure also ensures the rotational capacity of the throttle valve. The magnitude of the bearing clearance between the throttle valve shaft and the throttle valve housing can not be selected at will due to the manufacturing process of the injection-molded butterfly valve in the assembled state. For what remains, the bearing play also depends on the operation of the throttle valve of the prevailing temperature and the humidity of the air. In particular at low temperatures, the operating valve in the butterfly valve case increasing the bearing clearance. This effect is in itself undesired since in the case of a bearing set that is too large, the throttle valve can be destroyed due to resonance ( example because of an internal combustion engine). Under the requirement to achieve tightness towards the external environment, it is necessary to provide an additional sealing means between the throttle valve housing and the throttle valve shaft in the bearing zones. Too wide an oscillation of the throttle valve fins in the free cross section of the throttle valve case is in itself undesired, since this results in a gap whereby the throttle valve can no longer completely seal the passage cross section of the butterfly valve mechanism. The problem of the contraction of the throttle valve axes under different operating conditions can also occur in the case of throttle valves already assembled. This is regularly the case when the throttle valve shrinks at lower temperatures more sharply than the throttle valve case. The purpose of the present invention is, therefore, to provide a butterfly valve mechanism that has an optimum watertightness with respect to the environment, independently of the operating state and manufacturing process of the butterfly valve mechanism. outside or to the cross section of the passage to be sealed, the bearing set between the throttle valve shaft and throttle valve housing having to be minimized or even avoided in all operating states. 5 This purpose is satisfied by means of the features of claim 1. Advantages of the present invention The butterfly valve mechanism according to the present invention is constituted so that it can be The shrinkage of the throttle valve is compensated, which occurs either due to the manufacturing process or due to temperature and humidity fluctuations. The foregoing is basically ensured by constructive measures taken at the edge of the butterfly valve fins or on the throttle valve shaft. In this way, on the one hand, the throttle valve set can be avoided in the shaft bearings provided in the throttle valve housing and, on the other hand, the sealing requirements in the closed throttle valve or in the shaft bearings are satisfied. To reduce the gap caused by the throttle valve shrinkage, a second component can be applied by injection on the injection molded butterfly valve in the assembled condition after its injection. cooling, this second component occupying the interstice s. This component will also contract, however the gap will be considerably less in this case since the fins of the butterfly valve, already cooled after the injection of the second component, no longer vary in volume. The original gap that results after the injection of the second component into the throttle valve housing can be reduced by the b / s factor, b being half the width of the throttle valve from the rotation axis to the fin edge of the throttle valve. the butterfly valve. A butterfly valve module manufactured entirely by the injection molding technique in the assembled state can therefore be produced in three stages. In the first stage, the butterfly valve housing is molded by injection into a frame, in the second stage the butterfly valve body consists of the butterfly valve fins and the throttle valve shaft, and in the third stage is injected into the valve body. edge of the butterfly valve. For the production of the throttle valve edge, corresponding feed ducts must be provided in the injection molding tool, while for the manufacture of the same throttle valve it is possible to make use of the through openings provided in the valve box butterfly in the form of a frame for the housing of the throttle valve shaft. The injection-molded butterfly valve mechanism in the assembled state is preferably made of plastic. A precondition for the selection of materials for the different components is that the component material for the throttle valve edge adheres firmly to the throttle valve fins, but not to the butterfly valve housing in the form of a frame. This occurs particularly when the butterfly valve edge is injection molded of the same plastic as the butterfly valve fin, since also said butterfly valve fins must not adhere to the butterfly valve case. It is also advantageous to provide for the butterfly valve edge an elastic material, such as for example thermoplastic elastomers (TPE). The elastic edge of the butterfly valve fins in this case ensures a better sealing of the throttle valve with respect to the throttle valve edge, particularly when within the inside of the throttle valve rim a corresponding bead is provided on which the throttle valve rests. butterfly valve of maneuver. According to another embodiment of the present invention, the throttle valve shaft can be formed in the area of the bearing provided in the throttle valve housing at least in part conically. A corresponding cone that is congruent to the throttle valve shaft must be provided in the housing opening provided in the throttle valve housing. The cone may have its opening towards the outside of the throttle valve housing or towards the inside of the throttle valve housing. Which taper opening direction is most appropriate in each particular case depends on the selection of the materials, as will be described below in more detail. In the case of a decrease in temperature and / or air humidity, the throttle valve will normally contract more sharply than the throttle valve case. This would be the case of application in which the cone of the throttle valve shaft and of the throttle valve case is functionally provided with its direction of taper opening directed outwards. Shrinkage of the throttle valve shaft has an axial component and a radial component. The radial shrinkage component either increases or produces a gap between the conical housing provided in the throttle valve housing and the shaft butterfly valve. The axial shrinkage of the throttle valve shaft simultaneously produces a shortening of the shaft and, consequently, a compensation of the play produced. For this purpose it is necessary that the throttle valve shaft 5 be fixed against axial displacements. The foregoing can take place substantially advantageously by providing a second conical portion at the other end of the throttle valve shaft. This fixing in axial direction, however, can also take place by means of a shoulder provided on the shaft. A fixing against axial displacement of the throttle valve shaft is also naturally given by the same butterfly valve fins, which delimit the axial play of the throttle valve shaft in the through opening provided in the butterfly valve box. The angle of opening of the taper can be selected depending on the selected materials and the dimensions of the butterfly valve so that the shrinkage, axial and axial components are mutually compensated. radial, butterfly valve shaft. Alternatively, the taper opening angle can also be selected so that a slight axial pretension of the valve axis occurs when the temperature decreases. butterfly. With this measure, tolerances can be compensated for the throttle valve shaft and the throttle valve housing, ensuring a throttle-free assembly of the throttle valve shaft in the throttle valve housing through the entire tolerance zone. The minimum tolerance of the throttle valve shaft in the low temperature zone in this case also ensures a compensation of the play caused by wear. It is also advantageous that the conical portion of the throttle valve shaft does not extend over the entire area of the bearing provided in the throttle valve case, thereby resulting in addition to a conical portion also a cylindrical portion of the throttle valve shaft. By means of these measures, the advantages of the inventive butterfly valve can be combined with the advantages of the already known solutions. In the case of high temperatures, a play results in the conical area since the throttle valve shaft dilates axially more sharply than in the radial direction. At the same time, the diameter of the throttle valve shaft in the cylindrical portion is increased to a greater extent, and the through-hole provided in the throttle valve housing for housing the throttle valve shaft widens. The function of the rotating assembly without play, consequently, in the case of high temperatures, the cylindrical portion of the throttle valve shaft is satisfied. By means of a corresponding configuration of the conicity it is furthermore possible to achieve that the free-rotating support 5 passes at a certain temperature of the cylindrical portion to the conical portion, thus ensuring a play-free rotating support under any operating condition of the butterfly valve. The air humidity values are substantially the same exposures that for the temperature. According to a particularly advantageous embodiment, the cylindrical portion can pass to the conical portion without interruption. In this case, an infundibuliform configuration of the openings results passages provided in the butterfly valve case so that no edge is formed between the cylindrical portion and the conical portion. The configuration of the funnel can take place in such a way that the butterfly valve shaft comes into contact only with a small area of the perforation pass provided in the butterfly valve case due to its expansion. As the temperature increases, said contact surface moves from the conical portion to the cylindrical portion. In the case of this embodiment The minimal friction that occurs throughout the operating range of the throttle valve is particularly advantageous. A particularly advantageous embodiment of the present invention envisages providing that at least one bearing area of the throttle valve shaft in the throttle valve housing has two conical portions with mutually opposite taper angles, a portion of which can be provided between both conical portions. Cylindrical butterfly valve shaft. The operative form of this bearing variant corresponds to the previously described. In this context it is conceivable to apply this variant, by way of example, in the case of a cantilever rotating assembly of the throttle valve in the throttle valve housing. These and other features of further advantageous developments of the present invention arise, in addition to the claims, also from the specification and the drawings, individual features being able to be materialized in each case by themselves or several in forms of subordinate combinations in the form of embodiment of the present invention and in other fields, which may advantageously represent self-protected embodiments, for which protection is claimed.

Drawings Further details of the present invention will be described in connection with schematic exemplary embodiments illustrated in the drawings, in which: Figure 1 illustrates the injection molded valve valve module in the assembled state, as seen from the front, presenting the throttle valve a throttle valve edge as a second component, as well as conical portions on the throttle valve shaft in the areas of both bearings provided in the throttle valve housing. Figure 2 illustrates a section AA through the injection-molded butterfly valve module in the assembled state according to figure 1. Figure 3 illustrates the embodiment of a butterfly valve bearing provided in the butterfly valve case with seamless transition from the cylindrical portion to the conical portion according to detail X in figure 1. Figure 4 illustrates the assembly of the axis for the throttle valve in a bearing provided in the butterfly valve case with two conical portions according to detail X in the figure 1.

DESCRIPTION OF THE EXEMPLARY EMBODIMENTS FIG. 1 shows a front view of the butterfly valve inventive mechanism, the latter being constituted by a frame-shaped box 10 in which a butterfly valve 11 is disposed by injection molding. in mounted state. Consequently, the butterfly valve, which is constituted in one piece by a butterfly valve shaft 12, butterfly valve fins 13 and an edge butterfly valve peripheral 14. The throttle valve edge 14, whose spacing with respect to the butterfly valve fins 13 is represented by a dashed line, is applied by injection molding in a second operating stage in the fins of butterfly valve 13 after cooling the butterfly valve. The throttle valve housing 10 has sealing slots 15 which ensure the tightness between the inner chamber and the external environment when the throttle valve is mounted in a tube section not illustrated by means of joints not illustrated. The butterfly valve housing also has a fixing flange 17, which may be the same used for fixing the butterfly valve between the pipe sections. In the fixing flange 17, perforations 16 are provided for house screws. The butterfly valve shaft 12 is rotatably mounted in through openings 18 provided in the frame-like housing. The outline of the through openings is indicated by dashed lines in the throttle valve housing and corresponds congruent to the outline of the throttle valve shaft 12 in the bearing areas provided that the bearing set is not taken into account. The through openings have a cylindrical portion 19 and a conical portion 20. Figure 2 shows both the throttle valve 11 and the cutout box 10. It can be seen from the same that the valve-shaped butterfly valve housing 10 has a sealing groove 15 on both end faces. The operation butterfly valve 11 is injection molded in the slightly oblique position mounted inside the housing. With this measure it is achieved that the edge 14 of the throttle valve abuts in the box in the form of frame 10. With this measure the sealing of the throttle valve can be increased and prevent a seizure of the throttle valve in the closed state. The throttle valve shaft 12 and the throttle valve fins 13 are additionally reinforced by ribs 21.

In Figure 3 there is illustrated a version of the through opening 18, in which the transition from the cylindrical portion 19 to the conical portion 20 takes place without continuity solution. Figure 3 illustrates the throttle valve shaft 12 mounted in the through opening 18 under conditions of high prevailing temperatures in the operating zone, the play 22 resulting in the conical area 20 between the throttle valve shaft 12 being exaggeratedly illustrated. and the through opening 18. Figure 4 illustrates an embodiment of the throttle valve shaft 12 with two conical portions 20 mounted in a through opening 18 provided in the case 10. Between both conical portions a cylindrical portion 19 is provided. butterfly valve is illustrated with exaggerated play 22 in the cylindrical zone for the case that low temperatures of the operating zone reign.

Claims (6)

Claims

1. - Butterfly valve mechanism, particularly butterfly valve injection molded in the assembled state, of the type comprising a box in the form of frame (10) and a butterfly valve (11) consisting of a butterfly valve shaft (12) and fins of butterfly valve (13), the butterfly valve shaft being rotatably mounted in through openings (18) provided in the box (10) and closing the butterfly valve substantially complete a through opening provided in the box (10) by its rotation on the throttle valve shaft, means being provided for compensating the contractions of the throttle valve (11) due to the manufacturing process and / or due to temperature and humidity variations in the throttle valve mechanism, characterized in that the shaft of butterfly valve (12) and the corresponding passage opening (18) respectively have at least one conical portion (20), there being a temperature zone in which the game appears in the conical zone between the throttle valve shaft (12) and the through opening (18).

2. - Butterfly valve mechanism according to aa * claim 1, characterized in that the throttle valve shaft (12) and the corresponding through opening (18) have at least one cylindrical portion (19), there being a temperature zone in which the set disappears in the cylindrical zone between throttle valve shaft (12) and through opening (18).

3. - Butterfly valve mechanism according to at least one of claims 1 or 2, characterized in that two portions are provided on at least one of the ends of the throttle valve shaft (12) and in the corresponding through opening (18). Conics with mutually opposite angles of taper.

4. - Butterfly valve mechanism according to at least one of claims 2 or 3, characterized in that at least one conical portion (20) passes without continuity to the adjacent cylindrical portion (19).

5. Butterfly valve mechanism according to at least one of the preceding claims, characterized in that the butterfly valve (11) is constituted by two components 20 injection molded in the state mounted on the body (10), the first component constituting a body of butterfly valve (12, 13) and the second component a butterfly valve edge (14), the butterfly valve edge being applied F (14) on the butterfly valve body shrunk by the contractions caused by the manufacture.

6. Butterfly valve mechanism according to at least one of the preceding claims, characterized in that the butterfly valve body (12, 13) is made of plastic and the butterfly valve edge (14) of an elastic material, particularly thermoplastic elastomers ( TPE).