Sealing device for pumps for pumping various chemically abrasive media

Abstract

FIELD: sealing equipment.SUBSTANCE: centrifugal pumps and hydraulic units for sealing stuffing box chambers, movable and fixed joints operating at elevated pressures and chemically aggressive environments containing abrasives. A sealing device for pumps for pumping various chemically abrasive media, comprising a package of working collars having a sealing and supporting surface with spring tongues, with a central projection of variable thickness and a corresponding groove on the opposite end, a pressure ring, a support ring, the modulus of elasticity of the material of the pressure and support rings is equal to or greater than the corresponding indicator of the material of the working collars, the pressure and support rings are made of a polymer material, while additionally containing three adjusting screws connecting all components of the sealing device and located in the center of the cross-section of the sealing device at an angle of 120°, a pressure round plate with nuts, a support round plate with holes, while on the support ring on the right side of the end in the center there is an annular groove with through holes for adjusting screws, combined with three radial grooves located at an angle of 120°, while on the pressure ring on the left side of the end in the center there is an annular groove with holes for nuts and adjusting screws, while the adjusting screws are presented in the form of elongated spokes, on one side of the spoke there is a thread, and on the other there is a screw head for a screwdriver, while the holes in the support round plate are made under a bevel for the head of the adjusting screw, while the pressure round plate with nuts and the support round plate with holes are made of stainless steel.EFFECT: improvement in the operational characteristics of the sealing device of pumps, the possibility of soft regulation of the compression of the package.1 cl, 4 dwg

Description

[0001] The invention relates to sealing technology, in particular to centrifugal pumps and hydraulic units for sealing stuffing box chambers, moving and fixed joints operating at elevated pressures and chemically aggressive environments containing abrasives.

[0002] A sealing device for pumping abrasive and chemical liquids is known, comprising a package of working cuffs with spring tongues having a sealing and supporting surfaces, with a central protrusion of variable thickness and a corresponding groove on the opposite end, a pressure support and a support ring, the modulus of elasticity of the material of the pressure supports and support rings is greater than the corresponding indicator of the material of the working cuffs, a means for supplying lubricant, wherein the package of working cuffs is made of cuffs sequentially glued together along the diameter of the central protrusion and a groove corresponding to it on the opposite end, one of the outer cuffs of the package is glued along the diameter of the groove with the protrusion of the pressure support, the support ring is made one-piece, on the outer and inner surfaces of which annular grooves are made, communicating with each other by radial holes,wherein the end face adjacent to the working cuff has a groove and outwardly beveled surfaces on the sides, the angles of inclination of which are equal to the corresponding angles of the supporting surfaces of the spring tongues of the working cuffs in their free state, the groove of the support ring is glued along the diameter with the central projection of the cuff, the means for supplying lubricant communicate with the annular grooves of the support ring, the pressure support and the support ring are made of a polymer material. (Patent of the Russian Federation No. 198363, published 02.07.20).,

[0003] A sealing device for pumping abrasive and chemical liquids is known, comprising a package of working cuffs with spring tongues having a sealing and supporting surfaces, with a central protrusion of variable thickness and a corresponding groove on the opposite end, a pressure support, a support ring, a spacer sleeve, on the outer and inner surfaces of which annular grooves are made, communicating with each other by radial holes, the modulus of elasticity of the material of the pressure supports and support rings is greater than the corresponding indicator of the material of the working cuffs, wherein the package of working cuffs is made of cuffs sequentially glued together along the diameter of the central protrusion and the corresponding groove on the opposite end, one of the outer cuffs of the package is glued along the diameter of the central protrusion with the groove of the support ring, the other outer cuff of the package is glued along the diameter of the groove with the protrusion of the pressure ring, the spacer sleeve is made in one piece,wherein one side repeats the configuration of the pressure support, the projection of which has an adhesive connection along the diameter with the groove of the cuff, the other side repeats the configuration of the support ring, the groove of which along the diameter has an adhesive connection with the projection of the cuff, the spacer sleeve, the pressure support and the support ring are made of a polymer material. (Patent of the Russian Federation No. 198333, published 02.07.20).

[0004] A sealing device for pumping abrasive and chemical liquids was selected as a prototype, comprising a package of working cuffs with spring tongues having a sealing and supporting surfaces, with a central protrusion of variable thickness and a corresponding groove on the opposite end, a support ring, an annular pressure support, in which the end adjacent to the working cuff has a protruding stop and outwardly beveled surfaces on the sides of the stop, the angles of inclination of these surfaces are equal to the corresponding angles of the supporting surfaces of the spring tongues of the working cuffs in their free state, the modulus of elasticity of the material of the working cuffs increases in the direction from the support ring to the pressure support, but does not exceed the corresponding indicator of the pressure support, while the working cuffs are sequentially glued together along the diameter of the central protrusion and the groove corresponding to it on the opposite end of the cuff,wherein one of the outermost cuffs is glued along the diameter of the central projection with the groove of the support ring, the other outermost cuff is glued along the diameter with the groove with the protruding stop of the annular pressure support, the pressure support and the support ring are made of a polymer material. (Patent of the Russian Federation No. 198332, published 02.07.20).

[0005] The disadvantages of these sealing devices are the lack of ability to adjust the compression of the cuff petals during installation.

[0006] The task is to prevent squeezing (pinching of the petals) of the sealing device cuffs during installation and subsequent overheating and rapid wear.

[0007] The technical result is an improvement in the performance characteristics of the sealing device of pumps, the possibility of soft regulation of the compression of the cuff petals.

[0008] The technical result is achieved by a sealing device for pumps for pumping various chemically abrasive media, comprising a package of working cuffs having a sealing and supporting surface with spring tongues, with a central protrusion of variable thickness and a corresponding groove on the opposite end, a pressure ring, a support ring, the modulus of elasticity of the material of the pressure and support rings is equal to or greater than the corresponding indicator of the material of the working cuffs, the pressure and support rings are made of a polymeric material, according to the invention, it additionally contains three adjusting screws connecting all the components of the sealing device and located in the center of the cross-section of the sealing device at an angle of 120 °, a pressure round plate with nuts, a support round plate with holes, while on the support ring on the right side of the end in the center there is an annular groove with through holes for the adjusting screws,combined with three radial grooves located at an angle of 120°, while on the pressure ring on the left side of the end in the center there is an annular groove with holes for nuts and adjusting screws, while the adjusting screws are presented in the form of elongated spokes, on one side of the spoke there is a thread, and on the other there is a screw head for a screwdriver, while the holes in the support round plate are made under a bevel for the head of the adjusting screw, while the pressure round plate with nuts and the support round plate with holes are made of stainless steel.

[0009] The invention is explained by drawings.

[0010] Fig. 1 shows a general view of the sealing device and view A on the right.

[0011] Fig. 2 shows an enlarged section B of the sealing device.

[0012] Fig. 3 shows an enlarged section B of view A on the right.

[0013] Fig. 4 shows a section of the pressure round plate with nuts and view G on the right.

[0014] The sealing device of pumps for pumping various chemically abrasive media (Figs. 1 and 2) consists of a package of working cuffs 1 having a sealing and supporting surfaces with spring tongues, with a central projection of variable thickness and a corresponding groove on the opposite end. Along the edges of the package, on the side of the central projection of the first cuff 1, a pressure ring 2 is located, on the side of the groove of the last cuff of the package, a support ring 3 is located. The pressure and support rings 2, 3 are made of a polymer material, the modulus of elasticity of which is equal to or greater than the corresponding indicator of the material of the working cuffs 1. Along the diameter of the sealing device (view A of Fig. 1), three through holes are made at an angle of 120°, passing through the central axis of the cross-section of the sealing device, into which adjusting screws 4 are installed as shown in Fig. 2.The adjusting screw 4 is represented in the form of an elongated spoke, on one side of which a thread is made, and on the other a screw head for a screwdriver. On the pressure ring 2, on the left side of the end in the center, an annular groove with holes is made, into which the pressure round plate 5 with nuts 6 is installed (Fig. 3). On the support ring 3, on the right side of the end in the center, an annular groove is made, into which the support round plate 7 with holes is installed. The holes in the support round plate 7 are made at a bevel for the head of the adjusting screw 4. The adjusting screws 4, by means of the support round plate 7 with holes and the pressure round plate 5 with nuts 6, tighten all the components of the sealing device by a threaded connection and initially eliminate the gaps in the axial direction. For quick dismantling of the sealing device, three radial grooves 8 (Fig. 4) are made in the pressure ring along the diameter at the right end, which are aligned with the annular groove.For pumping acid-base media, it is necessary that the pressure round plate 5 with nuts 6 and the support round plate 7 with holes be made of stainless steel.

[0015] The operation of the sealing device is as follows.

[0016] The sealing device must be assembled using a special tubular fixture. After the sealing device is assembled, the pressure plate 5 with nuts 6, the support plate 7 with holes, and the head of the adjusting screw 4 must not protrude beyond the end surfaces of the pressure ring 2 and support ring 3. The sealing device must be assembled with zero clearance between the cuffs and rings, maintaining the same length along the diameter of the sealing device. The assembled sealing device must be treated on the outside and inside with neutral silicone grease. The sealing device must be installed into the pump stuffing box using a mandrel or an assembly container. Next, install and secure the gland follower, ensuring zero clearance with the end of the gland follower and the sealing device.In the proposed design, the gland bushing serves as a locking mechanism rather than a push-and-pull adjustment mechanism (as with gland packing). Adjusting screws 4 ensure the rigidity of the entire sealing device, limiting the movement of the gland bushing and protecting the sealing device from being pinched by the seal petals. If leaks occur during operation, the sealing device should be tightened using adjusting screws 4 with a screwdriver until the leaks disappear.

[0017] Thus, the declared design of the sealing device of pumps for pumping various chemically abrasive media is a prefabricated rigid structure with the possibility of soft adjustment of the compression of the cuff petals.

Claims

A sealing device for pumps for pumping various chemically abrasive media, comprising a package of working cuffs having a sealing and supporting surfaces with spring tongues, with a central projection of variable thickness and a corresponding groove on the opposite end, a pressure ring, a support ring, the modulus of elasticity of the material of the pressure and support rings is equal to or greater than the corresponding indicator of the material of the working cuffs, the pressure and support rings are made of a polymeric material, characterized in that it additionally contains three adjusting screws connecting all components of the sealing device and located in the center of the cross-section of the sealing device at an angle of 120°, a pressure round plate with nuts, a support round plate with holes, wherein on the support ring on the right side of the end in the center there is an annular groove with through holes for adjusting screws, combined with three radial grooves located at an angle of 120°,In this case, on the pressure ring on the left side of the end face in the center there is an annular groove with holes for nuts and adjusting screws, and the adjusting screws are presented in the form of elongated spokes, on one side of the spoke there is a thread, and on the other there is a screw head for a screwdriver, and the holes in the support round plate are made under a bevel for the head of the adjusting screw, and the pressure round plate with nuts and the support round plate with holes are made of stainless steel.

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