MXPA96004212A - Valve, especially a valve of expansiontermostat - Google Patents

Abstract

The present invention relates to a thermostatic expansion valve, having a housing with an inlet connection and an outlet connection, a valve seat interposed between the inlet connection and the outlet connection, a closure element that is movable by the force of a working element against the combination of a reference spring force and a fluid pressure in the housing, the reference spring is supported by a plate axially guided with a tilting face, and furthermore has a fitted device of reference spring housed in a side connection tube that is next to the housing, the reference spring adjustment device comprising a part that applies pressure with the means to secure against rotation and that has a contact face and a set screw with means for securing against displacement, the contact face coupled to the inclination face of a guide piece axially, the pressure applying part has a threaded oration a where a shank of a set screw is engaged, the rotation of an adjusting screw causes the axial movement of a part that applies pressure radially relative to a central axis of the guide plate and results in the adjustment of a reference spring

Description

VALVE, ESPECIALLY A THERMOSTATIC EXPANSION VALVE DESCRIPTION OF THE INVENTION The invention relates to a valve, especially a thermostatic expansion valve, that fills a valve-carrying housing that has a closing element which is movable by the force of a working element against the valve. the torque of a mill with a predefined or reference value and having a deflector that adjusts the preset value, housed in a lateral connection tube, which adjusts the adjustment of a contact face with a face. an axially guided plate, which holds the grinding wheel of predetermined value and has an adjustment knob for deplacing the contact face with a component acting radially with respect to the axis of the plate. Such valves are known, for example, from DE-PS 964 241 or FIG. 7 from US-PS 5 1 * 6207. The control by means of a face Filling the plate that holds the mill with a predetermined value has the advantage that a compact construction flop is produced. The manufacture requires a considerable degree of machining, however, for example in the cutting of a thread in the connecting tube that redbines the dkfosMtvo that adjusts the preset value. In Figures 1 and 4 of the US Pat. No. 5,186,207, inlet and discharge connection tubes are formed by the portions of the tube inserted in the remainder of the housing. For the purpose of adjustment, a piece of pressure is supported by only one contact face I on the underside of the plate that supports the mill of predetermined value and is secured in position by indentation on the side. tube wall of the outlet connection tube. Subsequent adjustment of the predetermined value is not possible in this case, however. The invention is based on the problem of providing a valve of the kind mentioned at the beginning, in which the machining in the area of the device that adjusts the predetermined value is reduced or completely avoided. This problem is solved according to the invention since the adjusting device comprises a pressure-applying part, which carries the contact face, which is secured against rotation and has a threaded hole and the adjustment tube is coupled with its shank in the threaded hole and is secured against displacement by leaning against the connecting tube. By separating the contact face and the adjusting screw, the threaded coupling can be moved from the housing to the pressing part. MecKos to prevent the rotation of the piece that applies pressure and the axial displacement of the adjustment tnnal are all that is required on the housing. This can be achieved without machining the housing. An additional advantage consists in that the thened contact face does not rotate with the adjusting screw. The contact face can therefore have a large area that lies against the tempered face of the plate that supports the grinding wheel of predetermined value. It is especially favorable if the connecting tube is in the form of a formed sheet metal part. The sheet metal can easily be formed to satisfy the remaining functions (protection against rotation, holding function). It is also favorable that the connection tube be formed by a substantially cylindrical tube which is joined to a base housing. The tube can be preassembled together with the adjusting device and subsequently joined to the base housing. A particularly simple means is provided which protects against rotation when the pressure-applying part has at least one circumferential groove or groove in which an indeptation of the wall of the connection pipe is coupled. In a further modality, an annulus is provided that surrounds the head of the adjusting tube, the anvil is secured in its position on one side by a ridge on the head and on the other side by an annular imitator disc positioned against the head. and it is held in place by an indentation on the wall of the connection pipe. The indeptación can be identical to aqueta to protect against the rotation. The tether annulus fixedly held in this manner between the flange and the annular dtocus makes a good hedge with respect to the medium in the housing, especially a refrigerant. In addition, it is recommended that a cassette be fitted on the outer end of the connection tube, against which the head of the adjustment torch rests. This grip therefore forms a retaining element which secures the adjustment stroke against axial displacement.

The casing is preferably retained in its position by indentations in the wall of the connecting tube. Normally, the Indentadons are sufficient to hold the caequillo securely. The adjusting screw head advantageously has a hexagonal receptacle, the dimensions of which are smaller than the internal diameter of the casing. Therefore the adjustment mode can be easily adjusted despite the presence of the case. In a preferred embodiment, provision is made for the casing to have an internal threading in which the stem of a tiler screw is coupled, the head of which tom presses an annular trowel washer against the outer end face of the connection tube. This rotary tiler is an additional safety measure which reliably prevents the escape of the valve housing. At present it is recommended that the tiler socket have a hexagonal socket, which is the same as that of the adjustment socket and an external hexagonal head. If the hexagonal tomium receptacle is trapped in the ice in an expansion valve of a refrigeration system, the screw can still be adjusted by using the external hexagonal head. There is no need to fear that the hexagonal receptacle of the adjustment problem will get stuck in the ice, because the cooling circuit does not contain moisture. It is also advantageous that the connection tube has a flange with raised welding buttons with which it is welded to the base housing, the space between the flange and the base housing is welded. The connecting tube is therefore able to receive the adjusting device and then be joined to the base housing by welding, so that during the subsequent welding process, the force of the mill of predetermined value has no influence on the position of the tube of connection. The connecting tube is advantageously a part that is cold-worked on appropriate molds. Such cold-worked parts on appropriate molds can be produced in a non-expensive manner, especially since such valves are manufactured in a large number of parts. The piece that needs pressure should preferably be a siptertzada part. By means of sizing, the desired shape can be produced, which includes thread cutting, especially since the piece of pressure is a comparatively small component. The adjustment screw and the casquio can be parts manufactured in particular by means of cold working methods on appropriate molds or cold flow molds. This also contributes to a non-expensive construction. In addition, the annular imitation dsco and the annular ductile washer can be stamped parts. All of the above mentioned parts can therefore be manufactured without machining, in such a way that the connecting tube and the entire adjustment device can be manufactured by means of saving processes or material. The invention is explained in additional detail later herein with reference to a preferred embodiment polished in the dubs, in which: Figure 1 is a side view of a valve according to the invention, partially in section, Figure 2 is a side view of a connection tube for receiving the reference or predetermined value adjustment device, Figure 3 is a view of the connection tube of Figure 2 from the left, and Figure 4 is a sectional perspective view of the connecting tube with the reference adjustment device inserted. The expansion valve illustrated in Figure 2 comprises a base housing 1 to which an inlet connecting pipe 2, a pipe connection 3 and a connecting pipe 4 for the adjustment device or reference 5 are welded by means of of respective flanges 6, 7 and 6. The base housing and connecting tubes consist of formed sheet metal parts, which have been manufactured by cold working on appropriate molds. The dagger 11 of a work element 12 is clamped between a cover anio 0 and a cover plate 10. B space for the end of the diaphragm joins pcf medto <; you a fijlM > capturing 13 to a temperature sensor that generates pressure, the pressure of which loads the diaphragm 11 from above. The pressure of the refrigerant prevailing in the valve and a predetermined or reference value grinding wheel 15 resting against a plate 14 act on the diaphragm 11 in the opposite direction. The diaphragm moves the closure element, not shown, of the valve in such a way that the valve's pressure is retained to a predetermined value by the end of the pressure supplied by the intake tube 13, since it is desirable. , for example, maintaining a predetermined degree of overheating at the end of an evaporator.

The plate 14 is guided axially on a bolt 16 integrated in the housing and can be displaced in the direction of the arrow 18; a connecting rod extends through the longitudinal opening 17 of the bolt in the usual manner eptrt < the diaphragm 11 and the closing element. The plate 14 further has an inclined face 19 on which a taper contact face 20 of the adjusting device 5 acts. The adjustment device of the predetermined value 5 has a piece 21 which applies pressure, which carries the teased face 20, which is secured against rotation and has a threaded bore 22. To secure it against rotation, the part 21 that applies pressure has slots or tongitudinal grooves 23 and 24 which are opposite each other, in which the indentations 25 and 26 of the wall of the connecting tube on each side of the connecting tube are coupled. The adjusting device 5 of the preset value has in addition an adjustment tube 27, which engages by means of its threaded rod 28 in the threaded hole 22 and by means of its head 29 bears against the housing in a sleeve 30 which it is fixedly attached to the connecting tube 4 by means of Mentations 31 in the wall of the connecting tube. The head 29 has a hexagonal receptacle 32 having smaller dimensions than the internal diameter of the cassette 30. When screwing and unscrewing the adjusting knob 27, the piece 21 which acts pressure moves in the direction of the arrow 33. This movement it is converted by the cooperation of the contact face 20 and the teinado face 19 to the axial movement (arrow 18) of the plate 14, with the result that the arrangement of the reference mill 15 is altered. An annouctor 34 is located in a space which is defined in the radial direction by a cylindrical face of the head 29 of the screw and the connecting tube 4 and in the axial direction by a flange 35 of the head 29 of the thyme and a annular limiting disc 36. The annular imitating disc is unable to yield or flex due to being held firmly in one direction by the head 29 of the tomio and in the other direction by the indentations 25 and 26. The casing 30 has an internal thread 37 in which a The tiler 38 engages, the head of which has a hexagonal socket 39 and an outer hexagon 40 for the placement of a tool. As the tiler thyme is tightened, an annular sealing ring 41 is held between the face or end of the connecting tube 4 and the underside of the tiler head 38. E «seal is a standard part and can be provided with a coating or nickel that reduces friction, so that with a small rotating torque, a satisfactory screed strength is allowed. This can also be exchanged in a simple way. Four buttons 42 are provided on the flange 8, whereby the connecting pipe 4 can be temporarily joined to the base housing 1 by a welding process, before the space between the flange 8 and the housing of the base 1 is with welding. All parts of the screw 0 which adjusts the pre-set or reference value 5 can therefore be assembled in the connection pipe 4 and then the connecting pipe 4 can be pressed with its flange 8 against the base housing 1 until it is consumed. union process. In this way, the parts of the device that adjusts the pre-set value remain trapped in the valve housing.

It is noted that in relation to this date, the best method known by the applicant to put into practice the invention, and the conventional one for the manufacture of the object to be reflected. Having described the invention as above, property is claimed as contained in the following

Claims (15)

1. A valve, especially a thermostatic expansion valve, having a housing that carries a valve seat, which contains a closing element which is movable by the force of a working element against the force of a reference spring or of value prefixed, and having a device that adjusts the predetermined value, housed in a lateral connection tube, which adjustment device is brought into contact by way of a contact face with a teinada face of an axially guided plate that supports the mill of predetermined value and has an adjustment volume for moving the contact face with a component acting radially with respect to the axis of the plate, characterized in that the adjusting device comprises a part that applies pressure which carries the contact face, which is secured against rotation and has a threaded hole, and the adjusting rod engages with its rod in the threaded hole and is secured against the displacement when leaning against the connecting tube.

2. A valve according to claim 1, characterized in that the connecting tube is in the form of a formed sheet metal part.

3. A valve according to claim 1 or 2, characterized in that the connecting tube is formed by a substantially diindrical tube which is joined to a base housing.

4. A valve according to any of claims 1 to 3, characterized in that the pressure-applying part has on its circumference at least one longitudinal groove or slot in which an indentation of the wall of the connection hub is collected.

5. A valve according to any of the claims 1 to 4, characterized in that it comprises a senator ring that surrounds the head of the adjusting screw, the position of which washer is secured on one side by a flange on the head and on the other side by means of an annular limiting disc which is subjected to the head and held in place by an indentation in the wall of the connecting tube.

6. A valve according to any of claims 1 to 5, characterized in that at the outer end of the connection pipe, a hollow is fitted, against which the head of the adjusting screw rests.

7. A valve according to claim 6, characterized in that the hollow is retained in its position by indentation in the wall of the connecting tube.

8. A valve according to claim 6 or 7, characterized in that the head of the adjusting tube has a hexagonal receptacle, the dimensions of which are smaller than the internal diameter of the casing.

9. A valve according to any of claims 6 to 8, characterized in that the hollow has an internal threading in which the rod of a tiler tube engages, the head of which took an annular seeding washer against the outer end face of the tube. of connection.

10. A valve according to claim 9, characterized in that the head of the tundish has a hexagonal receptacle, which is the same as that of the adjusting head and an external hexagonal head.

11. A valve in accordance with any of the claims 1 to 10, characterized in that the connecting tube has a flange with protruding welding buttons with which it is welded to the base housing, the space between the flange and the base housing is brazed.

12. A valve according to any of claims 1 to 11, characterized in that the connecting tube is a part that is cold worked on appropriate molds.

13. A valve in accordance with any of the items 1 to 12, characterized in that the piece qua pressure is a part slpterizada.

14. A valve conforms to any of the references 1 to 13, characterized in that the adjustment screw and the collar are parts manufactured by cold working methods on appropriate molds.

15. A valve in accordance with any of the returns 5 or 9, characterized in that the Annular Imitation disc and the Annular Sealing Annunciator are stamped parts.