Drying apparatus for domestic machines

Abstract

A drying apparatus for domestic machines such as dishwashers, washing machines or the like, having a liquid drying agent, a tank for the liquid drying agent and a rotatable distributor element for distributing the drying agent, and also a drive for the distributor element, wherein provision is made of a tank inlet for the return flow of the drying agent and a tank outlet for the removal of the drying agent, is proposed, said drying apparatus being improved in terms of leakage safety compared with the prior art. This is achieved according to the invention in that at least one closure element for closing the tank inlet and/or the tank outlet in a liquid-tight manner is provided.

Claims

1. In a drying apparatus for domestic machines having a liquid drying agent, a tank for the liquid drying agent and a rotatable distributor element for distributing the drying agent, and a drive for the distributor element, wherein provision is made for a tank inlet for the return flow of the drying agent and a tank outlet for the removal of the drying agent wherein the improvement comprises at least one closure element seal connected to a ram moveable in the axial direction for selectively closing the tank inlet and/or the tank outlet in a liquid-tight manner.

2. The apparatus according to claim 1 wherein the tank inlet and the tank outlet are closable simultaneously.

3. The apparatus according to claim 1 wherein the tank outlet is closable with the tank inlet open.

4. The apparatus according to claim 1 wherein the closure element seal is controllable by the rotational speed of the distributor element.

5. The apparatus according to claim 1 wherein the closure element seal is movable in the axial direction with respect to the rotation axis of the distributor element or an associated drive motor.

6. The apparatus according to claim 1 wherein the tank inlet and/or the tank outlet is/are arranged at least in part concentrically about the rotation axis of the distributor element or a drive motor for the distributor element.

7. The apparatus according to claim 1 wherein the closure element seal comprises at least one axial seal to close the tank inlet and/or tank outlet in an axial movement.

8. The apparatus according to claim 1 wherein the closure element seal comprises two axial seals.

9. The apparatus according to claim 1 further comprising a control cam element having at least one cam path that extends radially at least in part and at least one adjusting body that is at least in part radially movable.

10. The apparatus according to claim 1 further comprising a control cam element that is stationary in the axial direction with respect to the distributor element and a control cam element that is movable in the axial direction with respect to the distributor element.

11. The apparatus according to claim 1 wherein the closure element seal is connected to a movable control cam element.

12. The apparatus according to claim 1 further comprising a carrier element for carrying along the closure element seal said carrier element disposed between the closure element seal and a movable control cam element.

13. The apparatus according to claim 1 further comprising moveable cam control element and a restoring element for restoring the position of movable cam control element.

14. The apparatus according to claim 1 wherein when the apparatus is idle, the tank outlet is closed by a restoring element.

15. The apparatus according to claim 1 further comprising at least one control cam element having at least one cam path and at least two and preferably three stroke positions for the closure element seal settable by the rotational speed of the distributor element.

16. The apparatus of claim 1 wherein the drying apparatus is disposed in a dishwasher or washing machine.

17. A closure device for a drying apparatus having a hygroscopic drying agent comprising: (a) a hygroscopic drying agent tank having an inlet and an outlet in an elevational spaced relationship; (b) an impeller to move the hygroscopic liquid between the outlet, an appliance and the inlet, said impeller pump having a movable cam control element connected to a ram moveable in the axial direction to selectively engage the inlet and outlet in the elevational spaced relationship of the inlet and the outlet; and (c) a closure element operatively connected to the ram and moveable in the axial direction having a first closure device disposed in a first axial position to close the inlet and a second closure device disposed in a second axial position to close the outlet.

18. The closure device of claim 17 wherein the axial position of the closure element is controlled by the rotational speed of the impeller.

19. A drying apparatus comprising: (a) a tank for containing a drying agent, said tank having an inlet and an outlet; (b) a rotatable distributor element for removing the drying agent from the outlet of the tank and returning the drying agent to the inlet of the tank, said rotatable distributor element moveable in the axial direction with respect to the tank; (c) a closure element connected to the rotatable distributor element and moveable in the axial direction with respect to the tank, said closure element having a first seal for the inlet of the tank disposed in one position along the length of the closure element and a second seal disposed in a second position for the outlet of the tank along the length of the closure element; and (d) a control element to axially move the closure element between at least two positions to open the inlet and outlet or to close the inlet and outlet depending upon the speed of the rotatable distributor element.

20. The drying apparatus of claim 19 further comprising a drive motor to operate the rotatable distributor element and the control element.

Description

(1) An exemplary embodiment of the invention is illustrated in the drawings and is explained in more detail in the following text with reference to the figures, in which, specifically:

(2) FIG. 1 shows a schematic cross-sectional drawing through an apparatus according to the invention with an open inlet and an open outlet,

(3) FIG. 2 shows an illustration according to FIG. 1 with an open inlet and a closed outlet,

(4) FIG. 3 shows an illustration according to FIG. 1 with a closed inlet and a closed outlet,

(5) FIG. 4 shows a detail from FIG. 1,

(6) FIG. 5 shows a detail from FIG. 2,

(7) FIG. 6 shows a detail from FIG. 3,

(8) FIG. 7 shows a detail from FIG. 1,

(9) FIG. 8 shows a detail from FIG. 2, and

(10) FIG. 9 shows a detail from FIG. 3.

(11) The apparatus 1 for drying according to FIG. 1 comprises a tank 2 having a base tub 3 and a cover 4. The cover 4 is turned inward in a funnel-like manner and reaches far into the base tub 3 with an outlet nozzle.

(12) An impeller 6, which serves at the same time as a distributor element for drying liquid, follows the contour of the cover 4 in a more or less parallel manner and ends in an end tube 7 that extends in a substantially concentric manner with the outlet nozzle 5. Located on the opposite side of the end tube 7 from the cover 4 is a ram 8 which has a disk shape 9 on its upper side, cam paths 10 for adjusting balls 11 being arranged on the upper side of said disk shape 9. The ram 8 is movable in the axial direction (double arrow A). The ram 8 thus serves as a movable cam control element. Above the ram 8, a cam control element 13 that is rigidly connected to a drive shaft 12 is provided for conjoint rotation with the ram 8, said cam control element 13 having upper cam paths 14. The drive shaft 12 is connected to a motor output shaft 15 of an electric motor 16 for conjoint rotation.

(13) The end tube 7 of the impeller 6 divides at its lower end into an external centrifugal element 17 and an internal guide tube 18. The guide tube 18 bears in a form-fitting manner against the lower end of the ram 8 and passes partially through a closure element 19. The closure element comprises a radial sealing lip 20 and two axial sealing lips, i.e. the lower axial sealing lip 21 and the upper axial sealing lip 22. The sealing lips 21, are attached to two mutually concentric annular subelements 23, 24 of the closure element 19 and are connected by a crosspiece 25 in the form of an annular disk.

(14) A carrier element 26 is fastened to the underside of the ram 8 by means of a pivot bearing 27. The carrier element 26 can thus be moved in the axial direction via the ram 8 without rotating together therewith.

(15) The closure element 19 furthermore comprises an external crosspiece 28 which extends laterally to the level of a number of stop elements 29 on the base of the base tub 3.

(16) Located above the cover 4 is the drying chamber 30, in which the impeller 6 rotates and which is closed off by an upper cover 31. Provided in the upper cover 31 are feed air and discharge air elements, wherein only the discharge air tube 32 is discernible in the figures.

(17) FIG. 1 shows the state operated at full rotational speed with open inlet and open outlet for the drying agent, as do FIG. 4 and FIG. 7.

(18) The circulation of the drying agent 33 takes place in FIG. 1 as follows. The drying agent 33 is collected or stored in the base tub 3. The closure element 19 bears against the stop element 29 by way of the crosspiece 28 and is separated from the carrier element 26. Thus, an inlet annular gap 34, through which the drying agent, for example in the form of a lithium chloride solution, can pass into the interior of the inner subelement 23 of the closure element 9, arises between the carrier element 26 and the lower axial sealing lip 21. Through ducts 35 in the ram 8, the drying agent passes upward and through the intermediate spaces between the ram 8, the end tube 7 of the impeller 6 and the funnel-like intermediate part 36, which connects the end tube 7 to the impeller 6. In the region of the ducts 35, the ram 8 can be configured to form the ducts with a cruciform cross section, such that the ram 8 is suitable both for transmitting an axial tensile or compressive force and for transmitting torque and is thus permeable to liquid in the axial direction.

(19) The drying agent then passes by way of an upward movement into the region of the impeller 6, where it is distributed in the drying chamber 30 and comes into contact with air to be dried.

(20) The returning drying liquid, which has been augmented with moisture or charged with water, is collected via the funnel shape of the cover 4 and guided back downwardly into the outlet tube 5. By way of the centrifugal element 17, the drying liquid is spun off in the radial direction at the lower end and thus passes back into the tank 2 through an annular gap between an axial sealing surface 37 and the upper axial sealing lip 22. The annular gap 38 forms an outlet annular gap 38.

(21) As is explained in more detail in the following text, the ram 8, in the position illustrated in FIG. 1, is pushed downward counter to the restoring pressure of a restoring spring 39 which is arranged between the ram 8 and the end tube 7 of the impeller. As a result, the carrier element 26 is also pushed downward in the direction of the base of the base tub 3, with the result that the closure element 19 bears against the stops 29 and the inlet annular gap 34 is opened.

(22) The carrier element 26 is provided with carrier elements which are explained in more detail below, and so, although it is movable to a certain extent in the axial direction with respect to the closure element 19 in order to open the inlet annular gap 34, after the inlet annular gap has been opened, it is capable of entraining the closure element 19 further downward so that the outlet annular gap 38 is also opened.

(23) As can be seen in FIG. 1, the adjusting balls 11 are located in their radial outer end position, i.e. FIG. 1 represents a position with maximum rotational speed.

(24) At a median rotational speed, for example half the rotational speed, the state according to FIG. 2 is established. The restoring spring 39 pushes the ram 8 upward, while the adjusting balls 11 are located in a middle position with a median radius on account of the reduced centrifugal force. In this position, the carrier element 26 has been raised to such an extent that it bears against the lower axial sealing lip 21 such that the inlet annular gap 34 is closed.

(25) The state according to FIG. 3 shows the motor in an idle state in which the impeller 6 does not rotate. In this position, the ram 8 has been raised into its upper end position by the restoring spring 39, while the adjusting balls 11 are located in their radially inner end position. On account of this stroke of the ram 8, the closure element 19 is raised further via the carrier element 26 such that the outlet annular gap 38 is closed, i.e. also such that the upper axial sealing lip 22 bears against the sealing surface 37. In this position, the tank 2 is thus completely closed, i.e. the drying liquid, for example the lithium chloride solution, is accommodated in a leakproof manner.

(26) FIG. 4 illustrates an enlarged detail from FIG. 1 in which the adjusting balls 11 have assumed their radially outer end position. In this illustration, it is in particular discernible that the upper cam path 14 has a bend 40. This bend 40 defines an intermediate position for the adjusting ball 11, as is illustrated in FIG. 5. This intermediate position corresponds to the operating state according to FIG. 2. In this case, the adjusting ball 11 is located in the bend 40, resulting in a certain stability of this position, which is only overcome when a certain threshold value of the centrifugal force and thus of the rotational speed is exceeded in order to assume the position according to FIG. 4.

(27) The position according to FIG. 6 shows the resting position of the adjusting balls 11 in the upper end position of the ram 8. This position corresponds to FIG. 3.

(28) The different positions of the closure element 19 are discernible in FIGS. 7 to 9.

(29) FIG. 7 shows the completely open state, which corresponds to the maximum rotational speed and highest centrifugal force. The inlet annular gap 34 is open as well as the outlet annular gap 38. In the enlarged detail according to FIG. 7, a traction element 41 of the carrier element 26 is discernible, it being possible for said traction element 41 to be configured for example in the manner of a hook or as a latching element and to be axially displaceable to a certain extent with respect to the closure element 19. FIG. 7 shows the carry-along position of the carrier element 26, in which the carrier element 26 entrains the closure element 19 downward via the traction element 41. As a result of this traction by the traction element 41, the upper axial sealing lip 22 can be detached reliably from the sealing surface 37, and so it is not possible for any impeding adhesions to arise here.

(30) FIG. 8 shows the outlined position at half the rotational speed, i.e. the ram 8 has been raised slightly, such that the carrier element 26 bears against the closure element 19 or the lower axial sealing lip 21 and seals off the inlet annular gap 34. In this position, returning drying liquid can still be conveyed back via the centrifugal element 17 through the outlet annular gap 38 into the tank.

(31) When the rotational speed is reduced down to a standstill, the ram 8 is raised further by the restoring spring 39, wherein the carrier element 26 carries along the closure element 19 and raises it until the upper axial sealing lip 22 bears against the sealing surface 37 and the outlet annular gap 38 is also closed.

(32) In this position, as already outlined, the tank 2 is completely closed.

(33) When FIG. 7 and FIG. 8 are compared, the path length by which the traction element 41 is movable with respect to the closure element 19 can be seen. In the upward movement, the carrier element 26 thus acts directly as a carrier, in that the carrier element presses in a sealing manner against the lower sealing lip 21. In the downward movement, the carrier element 26 likewise acts as a carrier via the traction element 41, wherein this carry-along function starts only with the inlet annular gap 34 open.

(34) The invention is not limited to the illustrated exemplary embodiment; all that is essential is that a closure element for closing the tank inlet and/or tank outlet in a liquid-tight manner in a drying apparatus according to the preamble of claim 1 is present. However, the illustrated exemplary embodiment shows advantageous developments with which additional improvements in the leakage protection are achievable.

LIST OF REFERENCE SIGNS

(35) 1 Apparatus 2 Tank 3 Base tub 4 Cover 5 Outlet nozzle 6 Impeller 7 End tube 8 Ram 9 Disk shape 10 Cam path 11 Adjusting ball 12 Drive shaft 13 Fixed cam control element 14 Upper cam path 15 Motor output shaft 16 Electric motor 17 Centrifugal element 18 Guide tube 19 Closure element 20 Radial sealing lip 21 Axial lower sealing lip 22 Axial upper sealing lip 23 Subelement 24 Subelement 25 Crosspiece 26 Carrier element 27 Pivot bearing 28 Crosspiece 29 Stop 30 Drying chamber 31 Upper cover 32 Discharge air tube 33 Drying liquid 34 Inlet annular gap 35 Duct 36 Intermediate part 37 Sealing surface 38 Outlet annular gap 39 Restoring spring 40 Bend 41 Traction element