Valve, in particular thermostatic expansion valve

 

(57) Abstract:

Valve, in particular thermostatic expansion valve, relates to the field of valve industry. The valve contains installation spring, which is supported by a plate having an inclined surface. Attached to the body of the nozzle unit is installed to adjust the set value regulated value. The site contains a pressure element with an inclined surface that interacts with the inclined surface of the plate. The clutch element fixed against rotation and is made with a threaded hole. The adjusting screw of the node to adjust set your rod in the threaded hole of the pressure element and secured against displacement. The invention allows to reduce or completely eliminate machining in the area of devices for adjusting the set value regulated value. 14 C.p. f-crystals, 4 Il.

The invention relates to a valve, particularly to a thermostatic expansion valve.

Known valve according to patent US, 5186207, CL F 16 K 31/126, 1993, in which the inlet and outlet pipes are made of lengths of pipe, inserted into the rest of the body. To implement segueway installation spring, and held in place by tabs on the wall of the exhaust pipe.

A disadvantage of the known device is the inability to make further adjustments to the setpoint adjustable size.

The objective of the invention is to provide a valve of the above-mentioned type, in which the machining in the area of devices for adjusting the set value of the adjustable value of the reduced or completely eliminated.

The technical result is achieved that the valve, comprising a housing with a saddle locking element mounted for movement under the force of the working element, directed against the force of the adjusting spring and the node to adjust the set value regulated value, placed in the pipe and containing a pressure element, which interacts with its inclined surface of the inclined surface of the plate that is installed with the possibility of directional axial movement and supporting the installation of the spring according to the invention the pressure element is mounted for movement in a radial direction relative to the axis of the plates, fixed against rotation and is made with resimulation the hole of the pressure element with detent from moving because of the way into the socket.

When disconnecting the contact surface and the regulating screw threaded connection may be removed from the valve body in the direction of the pressure parts. In case you only want to create the means for preventing rotation of the clutch parts and the axial displacement of the adjusting screw. This can be done without machining of the housing. Another advantage of the invention is that the inclined contact surface is not rotated together with the regulating screw. Thus, the contact surface can have a large area and can be located opposite the inclined surface of the plate supporting the adjusting spring.

Especially preferred is the fulfillment of the nozzle in the form of molded parts from sheet metal. Sheet metal can be easily molded to perform the remaining functions (protection against rotation and non-rotation).

Preferred also is the fulfillment of the pipe, essentially cylindrical, attached to the main body. The pipe and the hub for adjustment can be pre-assembled and then attached to the main body.

The simplest means of protection against rotation is running on is it the ledge on the wall of the pipe.

In another embodiment, the around the head adjusting screw gasket is held in place with one hand by the shoulder of the screw head, and on the other side of the ring restrictive washer, located at the head and held in place by a protrusion on the wall of the pipe. This ledge may be identical to the ledge, preventing rotation. The gasket is fixed in this way between the shoulder and the ring washer provides a good seal in the housing environment, in particular refrigerant.

In addition, in a preferred embodiment of the outer end of pipe installed sleeve which abuts the head of the adjusting screw. This sleeve serves as a stopper that protects regulating screw against axial displacement.

In a preferred embodiment, the sleeve is fixed by the projections on the wall of the pipe.

In the head of the adjusting screw has a hexagonal recess, the size of which is less than the internal diameter of the sleeve to allow for easy movement of the screw.

In a preferred embodiment of the sleeve has an internal thread, which is installed with the outer end of the pipe. This screw serves as an additional means of protection, reliably prevents leakage from the valve body.

It is advisable to perform a head sealing screw with a hexagonal recess similar to the recess of the regulating screw, and making the head shape of a hexagon. In the case of icing hexagonal recess sealing screw installed in the expansion valve of the refrigeration unit, the screw can still be moved by external hex heads. Should not be afraid of icing hex deepen the adjustment screw, as inside the refrigerant circuit, the moisture is absent.

In a preferred embodiment, the nozzle has a flange with extruded welding ledges, through which the tube is welded to the main body, and the gap between the flange and the housing is filled with solder. Thus, the connecting tube configured to accommodate a site for correction, followed by attaching it to the main body by welding so that during subsequent soldering force the installation of the spring does not affect the position of the pipe.

In the preferred embodiment, with the Enen if the valves are manufactured in large batches.

In a preferred embodiment, the cover piece may be made of metal. During sintering without difficulty you can give details of any desired shape, including the execution of the screw holes, especially at relatively small sizes of the pressure parts.

Regulating screw and sleeve can be made, in particular, by the method of plastic deformation. It also helps to reduce the cost of construction.

Ring restrictive washer and an annular sealing gasket can be made by stamping.

Thus, all of the above parts may be made without machining, so that in the manufacture of pipe and node to adjust generally provided material saving.

More in detail the invention in the preferred embodiment is described below with reference to the accompanying drawings, on which:

Fig. 1 depicts a side view of the valve with partial cuts;

Fig. 2 depicts a side view of the socket for installing a node to adjust the set value of the adjustable value;

Fig. 3 depicts a left side view of the socket shown in Fig. 2; and

Fig. 4 depicts axonometry value.

The regulating valve shown in Fig. 1, contains the main body 1 with an inlet pipe 2, the exhaust pipe 3 and pipe 4 for placement of node 5 for correcting the set value regulated value. The pipes 2, 3 and 4 are soldered to the chassis, respectively, the flanges 6, 7 and 8. The main body and the nozzles are molded metal parts, made of sheet by the method of deep drawing. Between the closing ring 9 and the cover 10 is sandwiched aperture 11 of the working element 12. The space above the diaphragm capillary tube 13 is connected to the pressure sensor or creating pressure sensor, the pressure which acts from above on the diaphragm 11. The pressure of the refrigerant, your existing valve and abutting against the plate 14 installation spring 15 impinges on the diaphragm 11 in opposite directions. The diaphragm moves the locking element (not shown) of the valve so that the pressure at the outlet of the valve was above the pressure supplied through the capillary tube 13, by a specified amount, that it is desirable, for example, to maintain a constant degree of superheat at the evaporator outlet.

The plate 14 is installed with the possibility of a directional move in the axial direction between the diaphragm 11 and the locking element in the normal way passes the connecting rod. In addition, the plate 14 has an inclined surface 19, which acts inclined contact surface 20 of the node 5. Node 5 includes having the inclined surface 20 of the pressure piece 21, in which the threaded hole 22. To prevent rotation in the part 21 has longitudinal grooves 23 and 24 which lie opposite each other and including protrusions 25 and 26 in the wall of the pipe either side. In addition, the node 5 includes an adjustment screw 27 mounted its threaded rod 28 in the threaded hole 22 and resting her head 29 in the casing in the region of the sleeve 30, is rigidly attached to the pipe 4 by means of the projections 31 in the wall. The head 29 has a hexagonal recess 32, the size of which is less than the internal diameter of the sleeve 30. When tightening or loosening the screw 27 item 21 is moved in the direction indicated by the arrow 33. Due to the interaction of the contact surface 20 and an inclined surface 19 this movement is converted into axial movement of the plate 14 in the direction of arrow 17, as a result changes the deviation of the installation of the spring 15.

In the interval bounded in the radial direction of the cylindrical surface of the head 29 of the screw and the nozzle 4, and in osewa. Washer 36 can't move, because it is rigidly held in one direction by the head of the screw 29, and in the other direction - projections 25 and 26.

Sleeve 30 has an internal thread 37 on which is mounted a sealing screw 38, the head 39 which is made of hexagonal and provided with a hexagonal recess 40 for placement tool. When tightening sealing screw sealing ring 41 is clamped between the end surface of the pipe 4 and the inner side of the screw head 38. This seal is standard and to achieve sufficient air tightness at a small torque may have anti-friction Nickel coating. Such a seal may be without difficulty replaced.

The flange 8 has four welding protrusion 42, through which the pipe 4 can be temporarily attached to the main body 1 by welding to fill solder the space between the flange 8 and the housing 1. Thus, all the parts of the unit 5 to adjust the you can collect inside the pipe 4, and then press it against the flange 8 to the housing 1 until the end of the Assembly. Thus, the parts of the unit to adjust the setpoint adjustable values in the collection are held in the valve body.

element, mounted for movement under the force of the working element, directed against the force of the adjusting spring and the node to adjust the set value regulated value, placed in the pipe and containing a pressure element, which interacts with its inclined contact surface with the inclined surface of the plate that is installed with the possibility of directional axial movement and supporting the installation of the spring, wherein the compression element is mounted for movement in a radial direction relative to the axis of the plates, are fixed against rotation and is made with a threaded hole, and the node for the adjustment provided by the adjusting screw, set your rod in the threaded hole of the pressure element with detent from moving because of the way into the socket.

2. The valve under item 1, characterized in that the tube formed from sheet metal.

3. The valve under item 1 or 2, characterized in that the tube is essentially cylindrical and is attached to the body.

4. Valve according to any one of paragraphs. 1 to 3, characterized in that the surface of the pressure element is made of at least one of the longitudinal trenches shall ntil according to any one of paragraphs. 1 to 4, characterized in that it is provided with a sealing gasket covering the head of the adjusting screw and installed between the shoulder of the head, and an annular restrictive washer, opposite head and fixed protrusion on the surface of the wall of the pipe.

6. Valve according to any one of paragraphs. 1 to 5, characterized in that the nozzle at its outer end mounted sleeve which abuts the head of the adjusting screw.

7. The valve on p. 6, characterized in that the sleeve is fixed by the projections on the wall of the pipe.

8. The valve under item 6 or 7, characterized in that the head of the adjusting screw is made of a hexagonal recess, the size of which is less than the internal diameter of the sleeve.

9. Valve according to any one of paragraphs.6 to 8, characterized in that it is provided with a sealing screw and sleeve are made with inside thread that has mentioned rod screw, and between the screw head and the outer end face of the nozzle ring set gasket.

10. The valve under item 9, characterized in that the sealing head of the screw is made hexagonal recess similar to the recess in the head of the adjusting screw, PBOC made with flange with extruded welding ledges, with the help of which the pipe is welded to the housing, the space between the flange and the housing is filled with solder.

12. Valve according to any one of paragraphs. 1 - 11, characterized in that the tube made by the method of deep drawing.

13. Valve according to any one of paragraphs. 1 - 12, characterized in that the pressure element is made of metal-ceramic restorations.

14. Valve according to any one of paragraphs. 1 - 13, characterized in that the adjusting screw and the sleeve is made by way of plastic deformation.

15. The valve on p. 5 or 9, characterized in that the annular restrictive washer and an annular sealing gasket is made by stamping.

 

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