MX2011004159A - Device for sealing and transmitting hydraulic fluid in rotating lines of vertical flow. - Google Patents

Abstract

The present invention refers to a device for sealing and transmitting hydraulic fluid in rotating lines of vertical flow which is arranged over a fix base and allows two fix flow lines to be joined to other two lines that experiment a continuous and progressive bidirectional spin of 0 to +/- 360°, comprising: a base element in which inner portion have specific means for receiving a fluid resulting from a first fix flow supplying line and a fluid from a second rotating backflow line; a first mechanical seal arranged over the base and which allows a fluid to be transmitted between a first fix flow supplying line and a first rotating flow supplying line, through which the working fluid is led to a predetermined destiny which may be a heat exchanger or other device for treating circulation fluids; a second mechanical seal which partially rests over the base and is useful as a link for transmitting a backflow by means of the cavities of the base to a second fix backflow line, where this ba ckflow results from a fluid retention casing which simultaneously receives the flow from the second rotating backflow line; a cap element through which both supplying and backflow rotation lines, and the fluid retention casing, define their vertical position in the device; and an upper base element directly coupled to the cap element so as to form the upper part of the device, which is attached by four threaded screws to the base element in order to form a unit which as a whole may integrate the device.

Description

Hydraulic fluid sealing and transmission device for vertical flow rotating lines TECHNICAL FIELD OF THE INVENTION The present invention relates generally to a mechanical seal assembly, and in particular, to a hydraulic fluid sealing and transmission device designed for installation in dynamic applications, wherein said device allows the union of two fluid lines fixed with two others that undergo a bidirectional continuous and progressive turn that goes from 0 to +/- 360 °.

BACKGROUND OF THE INVENTION A mechanical seal is a device that allows to unite systems or mechanisms, avoiding the leakage of fluids, containing the pressure that is generated during and from a specific flow, consequently the lines of mechanical seals are classified, according to their application, for domestic use and industrial, for automotive use, for air and refrigeration compressors, and for chemical processes.

In the case of industrial and chemical processes, where leakage control is extremely important given the nature of the working fluid which can be toxic, corrosive or explosive, the seals are normally subjected to critical working conditions so some of the they are hydraulically balanced to withstand high pressures, they can also be manufactured with the right materials to withstand extremely high or low temperatures.

The design and application of this type of seals in the handling of hydraulic fluids is reflected to this day in the following documents: US Patent 4,426,092 discloses a mechanical seal assembly having rotary sealing ring means mounted for rotation on an axle and in a stationary sealing ring means connected with a flange cover, the sealing ring means having sealing surfaces. sealed opposite. The assembly also has means for urging the sealing surfaces towards each other. The rotary sealing ring means are of stepped configuration and are constructed as an integral pair of ring portions of equal axial length, one portion having its internal and external diameters larger than the respective diameters of the other. Generally, the ring portion having the smallest internal and external diameter is that portion of the ring that has the sealing surface that opposes the surface of the stationary sealing ring center. The degree of deviation of the sealing surface due to load or hydraulic pressure can be selected from the diameters of the pairs of ring portions.

US Patent 4,993,720 discloses a cylindrical seal constructed to be used in coaxial relationship with a rotary shaft of a pump shaft assembly having a fixed pump cover; said gasket comprises means for securing a substantially flat surface of the gasket in a face-to-face relationship against a fixed adjusting surface of the pump casing; the gasket includes three annular grooves etched in said substantially planar surface in a concentric and coaxial relationship with the main axis of the gasket, having two external grooves and a central groove between the two outer grooves, each groove having an annular bottom part within the groove. spaced joint and facing fixed setting surface; the means comprise an "O" ring of elastomeric material sized to seat securely in each of the external grooves, each "O" ring has an internal surface facing the respective lower part of the groove into which the ring is inserted " O "respective and has an external surface facing the fixed setting surface; means for interposing a viscous liquid in the external grooves between the inner surface of the "O" ring and the bottom of said grooves so that a portion of the outer surface of the "O" ring is compressed against the fixed fit surface of the pump cover; and means constructed to supply a desired amount of a fibrous composite to the central groove, being separated from the media by the interposition of a viscous liquid, the fibrous compound being in sealing contact between the surface of the gasket and the fixed fit surface of the gasket. the cover of the pump.

On the other hand the patent US 5,333,882 describes a mechanical seal assembly having double seals in which the seal faces of the primary seal members remain essentially perpendicular to the axis of the equipment that is sealed regardless of any misalignment between the shaft and the equipment. , has a sleeve to mount on the shaft to provide a support structure where all the primary faces of the Seal member are aligned with respect to this support structure regardless of the load. The primary seals are partially deflected towards the support structure by the combination of the net hydraulic pressure on the coupled faces of the seal plus a deviation from a source of minimum deviation, such as pressure springs, at one end of the sleeve.

US Pat. No. 5,560,661 discloses a seal formed between the external surface of a tube and the inner surface of a mechanical lining of a high-pressure liquid or of a hydraulic system by applying a very thin soft layer of metal to the external surface of the tube. hard metal and / or the inner surface of the hard metal lining. The thickness of such a thin layer of metal is independent of the size of the tube and / or fittings.

Finally, US Pat. No. 6,422,568 describes a mechanical seal assembly for sealing sealing rotation axes with respect to their shaft covers, wherein the axes of rotation are exposed to substantial axial vibrations. The mechanical seal assembly generally includes a rotary sealing ring attached to the shaft, a non-rotating sealing ring adjacent to and in close contact with the rotating sealing ring to form an annular seal on the shaft, and a mechanical diode element that applies a force that deflects the non-rotating sealing ring by means of a hemispherical joint. The alignment of the mechanical diode with respect to the closing rings is maintained by a series of linear bearings positioned axially along a desired length of the mechanical diode. Alternative embodiments of this invention include mechanical or hydraulic amplification components for amplifying the axial dislocation of the non-rotating sealing ring and transferring it to the mechanical diode.

As can be seen from the aforementioned prior art documents, there are currently various types of mechanical seals that also adapt to diverse and very varied application needs in the field of fluid handling, however, of all they warn a specific approach to the elements and characteristics of mechanical seals and not devices that from a specific structural configuration that includes the implementation of two mechanical seals, allow the union of two fixed fluid lines with two other that undergo a continuous and bidirectional progressive rotation from 0 to +/- 360 °, in such a way that from a single device that implements two mechanical seals, two lines of the same fluid can be controlled, that is, the feeding line and the return line, that is why, as a sealing device and transmission of hydraulic fluid for revolving lines v ertical, this novel invention is presented with which the following are intended: Objectives of the invention.

An object of the present invention is to provide a hydraulic fluid sealing and transmission device designed for installation in dynamic applications. Another object of the present invention is to provide a hydraulic fluid sealing and transmission device for vertical flow rotating lines, where starting from a specific structural configuration comprising the implementation of two mechanical seals, said device allow the union of two lines of fixed flow with two others that undergo a bidirectional progressive and continuous rotation from 0 to +/- 360 °.

Another object of the present invention is to provide a hydraulic fluid sealing and transmission device for vertical flow rotating lines, which allows to control two lines of the same fluid, that is, the feed line and the return line.

Another object of the present invention is to provide a hydraulic fluid sealing and transmission device for vertical flow rotating lines, which as a result of its structural configuration still operating in critical conditions prevents any leakage of working fluid.

Still another object of the present invention is to provide a hydraulic fluid sealing and transmission device for vertical flow rotating lines, where from the material from which it is manufactured, it allows it to operate in extreme conditions of pressure and temperature.

The objects of the present invention referred to above and even others not mentioned, will be evident from the description of the invention and the figures that illustrate and not restrictive accompany it, and that are presented below.

Brief description of the figures.

Figure 1 shows a conventional perspective of a sealing device and hydraulic fluid transmission for vertical flow rotating lines, made in accordance with the present invention; Figure 2 shows a conventional perspective of the device of Figure 1, where its disposition on a fixed base is appraised; Figure 3 shows an exploded view of the elements that make up the device of Figure 1; Figure 4 shows an exploded view of various elements that make up the device of Figure 1, wherein the arrangement of a first and a second mechanical seals relative to a base element can be seen; Figure 5 shows a top perspective of the base element of the device of Figure 1; Figure 6 shows a conventional perspective of the base of the device of Figure 1, where the interior of its lower chamber can be seen; Figure 7 shows a front elevational view of the base element of the device of Figure 1, wherein the arrangement of a rotating line of feed flow and its connection with a first mechanical seal and a lid element is appraised; Figure 8 shows a front elevational view of the base element of the device of figure 1, where the disposition of the rotating feed flow line, its connection with the first mechanical seal, the lid element and its disposition relative to a second mechanical seal and a fluid retention sleeve that surround it; Figure 9 shows a front elevation view of the fluid retention sleeve of the device of Figure 1, when this is connected to a lid and a top base; Y Figure 10 shows a conventional perspective of the fluid retention sleeve of the device of figure 1, when this is connected to the top cover and base.

Detailed description of the invention.

In accordance with what is illustrated in FIGS. 1 to 10, the device for sealing and transmitting hydraulic fluid for vertical flow rotating lines 100, object of the present patent application, hereinafter referred to as device 100, which is disposed on a fixed base 10 and that allows the union of two fixed flow lines with two others that undergo a continuous and bidirectional progressive rotation from 0 to +/- 360 °, it is understood of: a base element 20 inside which specific ways are configured to receive both a fluid coming from a first fixed line 5 of flow supply, and a fluid coming from a second revolving line 7 of flow return; a first mechanical seal 40 which is disposed on the base 20 and which allows the transmission of fluid between a first fixed flow supply line 5 and a first rotating flow supply line 6, through which the fluid of the flow is directed. work to a predetermined destination that can be a heat exchanger (not polished) or another device for fluid treatment in circulation; a second mechanical seal 50 that partially also rests on the base 20 and serves as a link to transmit a return fluid by means of cavities of the base 20 to a second fixed line 8 of return flow, said return fluid coming from a fluid retention sleeve 60 which in turn receives it from the second rotary flow return line 7; a lid element 65 through which both the rotating feed 6 and return flow 7 lines, as well as the fluid retention sleeve 60 define their vertical position in the device 100; and an upper base element 75 to which the cover element 65 is coupled directly to form the upper part of the device 100, which is connected to the base element 20 from four threaded screws 70 to form a unit which, in its set integrates device 100.

According to what is illustrated in detail in Figures 2 to 6 the base element 20 that integrates the device 100, is formed from a circular base 21 comprising four holes 22 equidistantly distributed near its periphery, in such a way that the arrangement of said four holes 22 defines a smaller diameter towards the interior of the circular base 21, this being the diameter with which a first hollow cylindrical chamber 23 projects from the base 21, which joins in its upper part a a second internally stepped cylindrical chamber 24 which retains the same diameter of the circular base 21 and also has four holes 25 equidistantly distributed near its periphery, where these four holes 25 have the same diameter and arrangement of the four holes 22 of the circular base 21, that is, they are aligned.

In the device 100 the base element 20 plays a double function, since on the one hand it directs the working fluid towards a destination for its treatment through the first fixed line 5 for feeding the flow, and on the other, it directs the fluid treated to its intended use through a second fixed return line 8 of flow, whereby the base element 20 has two fluid conduits that are configured as described below.

For the case of the route followed by the working fluid to its treatment destination, a first bore has been configured in the central part of the circular base 21 which is coincident with a second bore 26 that passes through the entire second cylindrical chamber internally step 24, in such a way that through these two holes and passing through the first hollow cylindrical chamber 23 the first fixed line 5 of flow supply whose length extends to the same level of a surface defined by a first step is inserted. 27 of the second internally stepped cylindrical chamber 24, surface which in turn serves as seat to the fixed head 41 of the first mechanical seal 40. Following the order that marks the trajectory of the working fluid towards its treatment destination and with support from the which is illustrated in figures 7 to 10, it is noted that the first mechanical seal 40 composed of a fixed head 41 and a moving head 42 is the element from the which the transmission of a hydraulic fluid between a fixed flow line 5 and a flow line 6 is achieved, which undergoes a bidirectional progressive and continuous rotation from 0 to +/- 360 °, without leakage or spillage during said transmission of fluid some of the fluid transmitted.

Having established that the first fixed flow line 5 comes into contact with the fixed head 41 of the first mechanical seal 40, it is necessary for the first rotary flow supply line 6 to be introduced into the moving head 42 of said first mechanical seal 40 thus completing the set of assemblies necessary to achieve in the device 100 from a first mechanical seal 40 a single fluid feeding line that is comprised of a fixed part and a rotating part.

In relation to the return line that allows the conduction of a working fluid from the place of its treatment to its place of use, it has that the second revolving line 7 of return of flow brings the fluid of interest from the place of its treatment and integrates it directly into the device 100 through the fluid retention sleeve 60 which completely surrounds the first rotary flow feed line 6 and which is introduced into the moving head 52 of the second mechanical seal 50, in FIG. where, in a frank analogy with what happens with the application of the first mechanical seal 40, when the moving head 52 of said second mechanical seal 50 is brought into contact with the fixed head 51 thereof, the transmission of a hydraulic fluid between a rotating flow line 7 and a fixed flow line 8 is achieved, without during said transmission of fluid there being leakage or spillage of the transmitted fluid, where to build a single fluid return line, said fixed head 51 rests on a seat defining a third step 29 of the second internally stepped cylindrical chamber 24, so that the working fluid that is transmitted from the fluid retention sleeve 60 through the moving heads 52 and fixed 51 of the second mechanical seal 50 is directed around the first rotary feed line 6 to the hollow cylindrical chamber 23, which is achieved through four holes 30 that have been configured from the surface defining a second step 28 of the second internally stepped cylindrical chamber 24, so that subsequently and from this hollow cylindrical chamber 23 the fluid is conducted through the second fixed return line 8 of flow to its place of final use.

For the structural configuration of the device 100 described above to achieve the expected results, it should be kept in mind that as illustrated in the figures accompanying this description, the second mechanical seal 50 is larger than the first mechanical seal 40, and even when this size ratio is quantifiable, suffice it to note that the second mechanical seal 50 will be in greater proportion to the first mechanical seal 40 as much as necessary so that the fluid retention sleeve 60 which is disposed towards the inside of the moving head 52 of said second mechanical seal 50 is capable of encircling the first rotary flow feeding line 6, and the space formed between the external walls of said rotary feeding line 6 and the internal walls of said jacket 60 is such as to allow the free flow of return fluid to the base element 20.

On the other hand, it should be borne in mind that the dimensions and proportions of the second internally stepped cylindrical chamber 24 are in direct function of the dimensions of the first 40 and second 50 mechanical seals that are used in the device 100.

Likewise, it must be borne in mind that in order to avoid fluid leaks in the assemblies of the first 40 and second 50 mechanical seals, a completely vertical alignment must be maintained between their fixed heads and the movable heads, therefore, with regard to ensuring said disposition in those of the fixed heads of both mechanical seals, special care has been taken in the machining of the flat surfaces defining the first 27 and third 29 steps of the hollow cylindrical chamber 23, and to achieve the same with the moving heads the device 100 has been complemented by a circular base cap member 65 and frustoconical projection body 67, on whose lower surface a circular recess (not shown) has been machined defining a seat ring for the fluid retention sleeve 60 , at the same time that it presents a concentric bore 68 in which the first rotating line 6 of feeding of flow is housed, and a second bore hole 69 deviated d the center but within the circular recess defining the seat ring in which the second revolving flow return line 7 is housed, in such a way that vertical and parallel positions are defined between the seat ring and the concentric bore 68. first rotary line 6 and the fluid retention sleeve 60, however, and in order to ensure the permanence of said positions, the device 100 has been complemented by an upper base element 75 to which the lid element 65 is directly coupled.

The upper base element 75 has a circular configuration with a frustoconical roughing on its lower surface that allows it to be coupled to the frustoconical projection body 67 of the lid element 65, it also comprises four holes 76 equidistantly distributed close to its periphery, where these four holes 76 have the same diameter and arrangement of the four holes 25 of the second internally stepped cylindrical chamber 24 and of the four holes 22 of the circular base 21, that is, they are aligned, so that once said three sets of holes present the same alignment it is possible to maintain the configuration and alignment described above from the implementation of four threaded screws 70 that are arranged through said sets of holes as illustrated in figure 1. It should be noted that the four threaded screws 70 used in the device 100, can be fastened by means of external nuts (n or illustrated) or by means of internal threads configured in each of the holes through which it passes.

In a preferred embodiment of the invention and with the exception of the first 40 and second 50 mechanical seals that are made of bronze in virtue of how favorable the coefficient of expansion of this material can be, all elements that make up the device 100 have been elaborated of copper and the mechanical seals implemented are of multiresortes of type SP-9, however, it should be understood that the materials used, the type of mechanical seals implemented and the dimensions of the device 100 may always vary depending on the work characteristics specified for the same device.

Thus, from the configuration described above for each of the elements that make up the device 100, the function that each of them independently performs and the result obtained from their integration, it is possible to determine that all the objectives of the invention originally defined and still others not specified are met, obtaining a device for sealing and transmission of hydraulic fluid for vertical flow rotating lines, completely new and different from those known up to now.

Claims (12)

Claims

1. A device for sealing and transmission of hydraulic fluid for vertical flow rotating lines, of the type that are arranged on a fixed base and that allows the union of two fixed flow lines with two others that undergo a continuous and bidirectional progressive rotation of 0 to +/- 360 °, characterized in that it comprises: a base element inside which specific routes are configured to receive both a fluid from a first fixed flow supply line and a fluid originating from a second revolving flow return line; a first mechanical seal which is disposed on the base and which allows the transmission of fluid between a first fixed flow supply line and a first rotating flow feeding line, through which the working fluid is directed to a destination predetermined for its treatment; a second mechanical seal that also partially rests on the base and serves as a link to transmit a return fluid by means of some cavities in the base to a second fixed return flow line, said return fluid coming from a holding jacket of fluid which in turn receives it from the second revolving line of flow return; a lid element through which both the rotating feeding and return flow lines, as well as the fluid holding jacket define their vertical position in the device; and an upper base element to which the lid element directly engages to form the upper part of the device, which is attached to the base element from four threaded screws.

2. The device for sealing and transmission of hydraulic fluid for vertical flow rotating lines, as claimed in claim 1, characterized in that the base element is formed from a circular base comprising four holes equidistantly distributed by of its periphery, in such a way that the arrangement of said four holes defines a smaller diameter towards the inside of the circular base, this being the diameter with which a first hollow cylindrical chamber projects from the base and joins in its upper part to a second internally stepped cylindrical chamber that also has four holes equidistantly distributed near its periphery.

3. The device for sealing and transmitting hydraulic fluid for vertical flow rotating lines, as claimed in claim 1, characterized in that in the central part of the circular base of the base element has been configured a first hole that is coincident with a second borehole that passes through the entire second cylindrical chamber internally stepped, so that through these two holes and through the first hollow cylindrical chamber is inserted the first fixed line of flow supply whose length extends to to be at the same level of a surface defined by a first step of the second internally stepped cylindrical chamber.

4. The device for sealing and transmitting hydraulic fluid for vertical flow rotating lines, as claimed in claim 1, characterized in that the first fixed flow supply line comes into contact with the fixed head of the first mechanical seal , while the first rotating flow feeding line is introduced into the moving head of said first mechanical seal.

5. The hydraulic fluid sealing and transmission device for vertical flow rotating lines, as claimed in claim 1, characterized in that the fluid retention sleeve completely surrounds the first rotating flow feed line, and it is introduced into the moving head of the second mechanical seal, while the fixed head of said second mechanical seal rests on a seat defining a third step of the second internally stepped cylindrical chamber of the base element.

6. The device for sealing and transmitting hydraulic fluid for vertical flow rotating lines, as claimed in claim 1, characterized in that the second internally stepped cylindrical chamber of the base element presents on the surface defining a second step four holes through which the working fluid is transmitted from the fluid retention sleeve to the hollow cylindrical chamber.

7. The device for sealing and transmitting hydraulic fluid for vertical flow rotating lines, as claimed in claim 1, characterized in that the second mechanical seal is larger than the first mechanical seal.

8. The device for sealing and transmitting hydraulic fluid for vertical flow rotary lines, as claimed in claim 1, characterized in that the lid element is integrated from a circular base and a frustoconical projection body, in whose lower surface has machined a circular recess that defines a seat ring for the fluid retention sleeve and which also has a concentric hole in which the first rotating flow feed line is housed, and a second hole offset from the center but within the circular recess that defines the seat ring in which the second revolving flow return line is housed.

9. The hydraulic fluid sealing and transmission device for vertical flow rotating lines, as claimed in claim 1, characterized in that the upper base element has a circular configuration with a frustoconical roughing on its lower surface that it allows coupling to the frusto-conical projection body of the cover element, it also comprises four holes equidistantly distributed near its periphery through which and by means of four threaded screws it is joined to the base element.

10. The device for sealing and transmission of hydraulic fluid for vertical flow rotating lines, as claimed in claim 1, characterized in that the first and second mechanical seals are made of bronze.

1 . The device for sealing and transmission of hydraulic fluid for vertical flow rotating lines, as claimed in claim 1, characterized in that all elements that make up the device are made of copper.

12. The device for sealing and transmission of hydraulic fluid for vertical flow rotating lines, as claimed in claim 1, characterized in that the first and second mechanical seals implemented are multiresorts of the type SP-9.