DE102009020483A1 - Slide ring sealing arrangement for sealing shaft passages in apparatus- and tank-construction, in agitators, mixers, dryers or pumps, has one or multiple annular grooves, which are arranged in cylinder walls of bearing seat of counter ring - Google Patents

Abstract

The invention is inter alia the object of developing a störunanfällige mechanical seal for use in apparatus and container construction, in agitators, mixers, dryers, pumps or the like, which in both high temperature range, but also in the cold mode or in the acid mode can also be used for sealing toxic media, and always ensures optimal safe cleaning of the construction-related Todraumes in the area of the mechanical seal adjacent container neck even with very heavily contaminated mechanical seal and also opens up new applications in addition to the above-described cleaning effect, while always working robust and reliable, production technology is easy to produce and can be optimally and easily assembled and also disassembled. The mechanical seal according to the invention and its arrangement is characterized in that in the / the Zylinderwandung / s (4) of the bearing seat (3) of the mating ring (2) one / more annular groove / s (8) is arranged /, and that in the bearing housing (1) associated, in the annular groove (s) (8) leading inlet openings (9) are arranged, and that on both sides of the / the annular groove (8) adjacent in the cylinder wall (4) of the bearing seat (3) of the counter-ring (2) Sealing elements (10) are arranged, and that in the mating ring (2) of the Ringnut / s (8) associated between the outer shell (11) of the mating ring (2) and the inner shell (12) arranged, the counter-ring (2) ...

Description

The The invention relates to a mechanical seal and its arrangement for Sealing of shaft bushings with stationary outer Sealing arrangement for use, in apparatus and container construction, in agitators, mixers, dryers, pumps or the like, which in aggregates of process engineering such as in the pharmaceutical, biopharmaceutical, and food industry u. a. m. used and both in the high-temperature range, in the cold mode, in acid operation as well as for sealing toxic media can be used.

Mechanical seal for sealing shaft bushings with stationary outer seal assembly have long been known and were, for example, in the DE 27 51 698 A1 described above.

Alles These designs of the prior art is a significant disadvantage common, which is that the area of the mechanical seal It is very difficult to clean in the associated container leaves.

But especially in the pharmaceutical, biopharmaceutical and food industries according to validation and qualification requirements intensive cleaning of these stirred containers, Mixers, dryers, pumps, etc. after the production of each batch absolutely necessary.

Therefore, so-called CIP (Cleaning in place) systems have been developed for cleaning these containers. Such arrangements as well as the associated methods are for example in the DE 100 46 049 C1 or in the EP 0495 883 described above. In these systems, a spray lance is introduced into the container via an additional, tightly closable in the production process container opening during the cleaning phase. The spray jet emerging at the spray head of this spray lance is guided in regions along the inner tank wall in such a way that the tank is thereby cleaned inside. A disadvantage of these designs are the so-called spray shadows, ie construction-related dead spaces such as the area of the container neck with the mechanical seal.

A faulty cleaning of these dead spaces can occur during product changes have serious consequences.

Therefore, in the DE 201 05 507 U1 as well as the DE 202 14 650 U1 proposed to arrange cleaning and gassing rings in the area of the mounting flanges in order to enter rinsing liquid into the dead spaces present in this area via spray nozzles arranged in these gassing rings.

The two solutions differ in that the solution after the DE 201 05 507 U1 the cleaning of the shaft area near the mechanical seal is used and the solution after the DE 202 14 650 U1 The cleaning of the container in the area of the drain neck, or the cleaning of sight glasses during the process is used.

The provided with spray nozzles, designed as flushing mounting flange of DE 201 05 507 U1 consists of a fiber-reinforced plastic ring. Directly on this purge ring of the counter ring of a mechanical seal is arranged rotationally fixed.

adversely in this solution is that this with spray nozzles provided design of the trained as flushing mounting flange also requires special counter-rings in the mechanical seal, and This results in the respective mechanical seals dimensions significantly different from the limits of standardized (standardized) mechanical seals differ.

Therefore, existing plants can not comply with the DE 201 05 507 U1 be pre-described arrangement retrofitted.

In addition, this solution is not suitable for systems with larger mechanical seals, as the high loads (for example, alone from the weight of the mechanical seal of over 50 kg), which in the solution after the DE 201 05 507 U1 as a result of the surface pressure occurring between the plastic ring and the sliding ring on the flange designed as a plastic ring (on the plastic parts) can cause deformations, which may then result, for example, leaks to the sealing surfaces of the mechanical seal. Another disadvantage of this solution is that in printing equipment, according to the applicable directives, only textile glass reinforced thermosetting plastics may be used.

In addition, since pressure-bearing plastic parts can only be used in the range of 0 ° C to 60 ° C, the after the DE 201 05 507 U1 trained aforementioned solution also not for extreme temperatures, such as the range of up to -30 ° C, or the range well above 100 ° C used.

In addition, that requires in the DE 201 05 507 U1 proposed solution also a high production and assembly costs.

Due to in the DE 201 05 507 U1 proposed "deep" and "forward" staggered arrangement of the spray ring is also an optimal cleaning a heavily soiled mechanical seal only conditionally possible.

In order to also clean other areas of the container, such as the area of drain sockets or sight glasses, or to keep sight glasses clean during the process, was in the DE 2002 14 650 U1 proposed flow vortex generating, provided with nozzle bores cleaning and gassing rings to clamp directly between the mounting flanges of each adjacent components.

such However, cleaning and gassing rings are used to clean the shaft outlet completely unsuitable in the field of mechanical seal, as this only very far (or too far) from the contaminated area of the mechanical seal can be arranged remotely.

Of the Invention is therefore the object of a störunanfällige Mechanical seal for sealing shaft passages with stationary outer seal arrangement for use in apparatus and container construction, in agitators, mixers, dryers, pumps or the like to develop, which in aggregates of process engineering such as in the pharmaceutical, biopharma, and food industry u. a. m. used are and which, for example, both in the high temperature range, but also in cold mode, or else in acid mode, as well as for sealing toxic media can be used, and the always an optimal safe cleaning of the construction-related Dead space in the region of the adjacent the mechanical seal container neck even if the mechanical seal is heavily contaminated, and also does not have the disadvantages of the prior art, but also retrofittable in existing systems is, and is also used even in systems with heavy counter-rings, even extreme temperature stresses such as very low in refrigeration or even high Withstand temperatures such as coal gasification, In addition, new fields of application in addition to the above-described cleaning effect opens up so that the solution to be developed not only for example for process cooling but also specifically for explosion protection, for example, for Stickstoffbeschleiherung of product spaces in stirred tanks with Classification in explosion zone "0" or for central supply of liquid or gaseous Reactants can be used in the reaction space, and always robust and reliable in all these applications works, while also manufacturing technology is easy to manufacture and even under extreme operating conditions simply excluding any Assembly error mounted and also optimally and easily disassembled can be.

According to the invention this object is achieved by a mechanical seal with at least one in a bearing housing ( 1 ) arranged pair of interacting Gleitdichtringe detached from those, the mating ring ( 2 ) rotatably in a bearing seat ( 3 ) of the bearing housing ( 1 ) and the other, the sliding ring ( 5 ) rotatably with a in the bearing housing ( 1 ) rotatably mounted shaft ( 6 ), wherein due to a contact pressure of the counter ring ( 2 ) with the sliding ring ( 5 ) along its contact ring surface, the sealing surface ( 7 ) in sealing engagement with each other and which is characterized in that in one / more Zylinderwandung / en ( 4 ) of the bearing seat ( 3 ) of the mating ring ( 2 ) one / more annular groove (s) ( 8th ) is / are and this / these annular groove / s ( 8th ) in the warehouse ( 1 ), into the annular groove (s) ( 8th ) leading inflow opening (s) ( 9 ) is arranged, wherein on both sides of / the annular groove / s ( 8th ) adjacent in the cylinder wall ( 4 ) of the bearing seat ( 3 ) of the Gegeninges ( 2 ) Sealing elements ( 10 ) are arranged, and in the mating ring ( 2 ) of the annular groove (s) ( 8th ), between the outer shell ( 11 ) of the mating ring ( 2 ) and the inner shell ( 12 ) of the mating ring ( 2 ), the counter ring ( 2 ) penetrating nozzle bores ( 13 ) are arranged.

This novel arrangement according to the invention allows a direct flow through the counter-ring ( 2 ) with cleaning fluids. This now by the inventive arrangement immediately adjacent to the sealing surface ( 7 ) inflowing cleaning liquid allows over the prior art, a direct flow of the inner contour of the sliding pair, the shaft outlet and the attachment sleeve.

This invention according to the invention immediately adjacent to the sealing surface ( 7 ) inflowing cleaning liquid now ensures over the prior art that the contaminated surfaces and dead spaces are achieved largely free of pressure loss and flushing and thus allows optimal safe cleaning of the construction dead space in the vicinity of the mechanical seal adjacent container neck even with very heavily contaminated mechanical seal.

But not only cleaning fluids, but also cooling media can now by means of the solution according to the invention for the first time so specifically in the immediately adjacent to the sealing surface ( 7 ) in the counter ring ( 2 ) arranged nozzle bores ( 13 ) are introduced, that the sliding surfaces according to the invention can be cooled in a targeted and defined at, occurring due to bearing friction, high sliding surface temperatures.

This type of cooling can be used, for example, in conjunction with sensors or temperature monitoring systems as a safety-relevant precaution, or as an additional protection system within the framework of the alarming if limit values of the surface temperature on the sliding surface are exceeded.

The inventive solution ensures the first time, that when using the mechanical seal according to the invention no explosions caused by these in an explosive environment can be, so that the invention also new fields of application for mechanical seals according to the invention opens.

About that In addition, however, the present invention, for example, to Process cooling can be used. The evaporation of technical gases leads to the generation of very low temperatures, which in combination with the inventive arrangement z. B. for Cooling of highly exothermic processes can be used can.

One Another very significant advantage of the invention Solution is that with very little effort the inventive solution even in existing Equipment can be retrofitted, since the dimensions of the invention Counter ring easily in the range of all standardized mechanical seals can be settled.

About that In addition, the inventive allows Solution that with all its invention Advantages even in very large systems with heavy mechanical seals (i.e., with mechanical seals weighing over 50, for example) kg) can be used without problems.

Alles these aforementioned advantages of the invention Solution is also superimposed that all variants the inventive solution also at extreme temperature stresses such as very low in refrigeration or even high temperatures like For example, in the coal gasification can be used because no plastic materials be used with the disadvantages already explained but "temperature-resistant" sliding bearing materials such as carbons, carbides, metal oxides o. Ä. Find employment.

In all the above cases of use is ensured that the inventive arrangement manufacturing technology Easy to produce, even under extreme operating conditions simply mounted to the exclusion of any assembly errors and also optimal and easy to disassemble again, and Moreover, it always works robust and reliable.

The present invention arranged in the mating ring nozzle bores ( 13 ) can in the context of the use of the solution according to the invention in the diameter, in their shape and in their position in the mating ring ( 2 ) be adapted depending on the application of the respective cleaning or process engineering task.

According to the invention, in this context, too, that in the arrangement according to the invention of two or more mutually adjacent annular grooves (FIG. 8th ) between the annular grooves ( 8th ) one or more sealing elements ( 10 ) to be ordered.

Thereby will ensure that the feeding of several Media in type and state of aggregation is possible. So will it is technically possible via a groove gas to perform, such. B. nitrogen for Gasbeschleiherung, For example, the gas lending system is for explosion protection in the Reactor space serves and it is possible at the same time in the second groove, for example, to clean cleaning fluid, around the inside of the mechanical seal and the stirrer shaft to remove product residuals before a new one Charge is set in the reaction space for reaction.

The Arrangement of the nozzles for Gasbeschleiherung takes place radial and parallel to the sealing surface as far as it is dry Gas acts.

at humid gas, the nozzle is tilted "down" by the angle (β), so that any accumulating condensate can drain into the reaction space.

The arrangement of the cleaning nozzles takes place radially at an angle (α) and parallel to the sealing surface ( 7 ) at an angle (β) inclined "up" so that the critical dead spaces on the inside of the mechanical seal and the outside of the agitator shaft can be cleaned purposefully.

It is also advantageous that one each of an annular groove ( 8th ) associated nozzle bores ( 13 ) to the lower edge of the groove "shifted" and by the angle (β) to the parallel to the sealing surface ( 7 ) for emptying the respective annular groove ( 8th ) is inclined to "down".

Thereby will ensure that the residual amounts from the annular grooves emptying by itself, so that by means of the inventive Also solve the requirements of typical validations and Qualifications of production processes, such as those in pharmaceuticals and food industry are required to be respected.

According to the invention is also, for example, when very aggressive or toxic media in the bearing housing ( 1 ) as sealing elements ( 10 ) Round rings (O-rings) are arranged, since these in practice Ensuring sealing connections with maximum reliability.

Further advantageous embodiments, details and features of Invention will become apparent from the dependent claims and the following description of the invention Solution in conjunction with the drawing for the embodiment of here present solution according to the invention.

following Now the invention with reference to an embodiment explained in more detail in connection with four figures.

there demonstrate:

1 : the side view of the solution according to the invention in a sectional view;

2 : the detail X from the 1 ;

3 : A sectional view of the mating ring according to the invention 2 out 2 ;

4 : the top view of the mating ring 2 according to 3 ,

The 1 shows the side view of the solution according to the invention in a sectional view with a in a bearing housing 1 arranged pair of co-operating Gleitdichtringen, one of which, the mating ring 2 rotatably in a bearing seat 3 of the bearing housing 1 with two cylinder walls 4 is arranged.

The other, the sliding ring 5 is non-rotatable with a bearing housing 1 rotatably mounted shaft 6 is connected, wherein due to a contact pressure of the mating ring 2 with the sliding ring 5 along its contact ring surface, the sealing surface 7 sealingly in operative connection with each other.

In the 2 is the detail X from the 1 shown enlarged.

According to the invention is in one of the cylinder walls 4 of the bearing seat 3 of the mating ring 2 an annular groove 8th arranged and in the warehouse 1 there are two in this ring groove 8th leading inlet openings 9 ,

It is characteristic that both sides of the annular groove 8th in the cylinder wall 4 of the bearing seat 3 of the mating ring 2 sealing elements 10 arranged. In the present embodiment are in the bearing housing 1 as sealing elements 10 Round rings (O-rings) arranged. As a result, a secure seal of the annular groove 8th guaranteed.

The 3 now shows the mating ring according to the invention 2 out 2 in a sectional view.

As in the 1 to 3 shown are the annular groove 8th assigned in the mating ring 2 , between the outer jacket 11 of the mating ring 2 and the inner jacket 12 arranged, the mating ring 2 penetrating nozzle bores 13 arranged.

The 4 shows the top view of the mating ring 2 out 3 ,

From this representation according to the 3 and 4 becomes clear that on the one hand the "lower" nozzle holes 13.1 parallel to the sealing surface 7 and at the same time inclined at an angle α1 to the radial.

The upper nozzle holes 13.2 On the other hand, both the radial at an angle α2 inclined as well as parallel to the sealing surface 7 arranged inclined at an angle β.

On Reason for the present invention solution succeeded in a störunanfällige mechanical seal for sealing shaft bushings with stationary outer Sealing arrangement for use in apparatus and container construction, in Agitators, mixers, dryers, pumps or the like to develop, which in aggregates of process engineering such as in the pharmaceutical, biopharma, and food industry u. a. m. used are and which both in the high temperature range, but also in the cold, or in acid mode, as well as for sealing toxic media can be used, and always optimal safe cleaning of the construction-related dead space in the area of the mechanical seal adjacent container neck even if the mechanical seal is heavily contaminated, and also in existing plants can be retrofitted, even can be used in systems with heavy mechanical seals, thereby even extreme temperature stresses such as very low in refrigeration or even high temperatures like For example, in the coal gasification stops and at the same time new fields of application in addition to the above-described cleaning effect opens up so that the solution to be developed not only for example for process cooling but also can be used specifically for explosion protection, and in All these applications always robust and reliable works, also manufacturing technology is easy to manufacture and even under extreme operating conditions, just under exclusion any assembly error mounted and also optimal and easy again can be dismantled.

1

bearing housing

2

counter ring

3

bearing seat

4

cylinder

5

sliding ring

6

wave

7

sealing surface

8th

ring groove

9

inflow

10

sealing elements

11

outer sheath

12

inner sheath

13

nozzle bores

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 2751698 A1 [0002]
• - DE 10046049 C1 [0005]
• EP 0495883 [0005]
• - DE 20105507 U1 [0007, 0008, 0009, 0011, 0012, 0013, 0014, 0015]
• - DE 20214650 U1 [0007, 0008]
• - DE 200214650 U1 [0016]

Claims (10)

Mechanical seal and its arrangement with at least one in a bearing housing ( 1 ) arranged pair of interacting Gleitdichtringe, one of which, the mating ring ( 2 ) rotatably in a bearing seat ( 3 ) of the bearing housing ( 1 ) with one or more cylinder walls ( 4 ) and the other, the sliding ring ( 5 ) rotatably with a in the bearing housing ( 1 ) rotatably mounted shaft ( 6 ), wherein due to a contact pressure of the counter ring ( 2 ) with the sliding ring ( 5 ) along its contact ring surface, the sealing surface ( 7 ) in sealing engagement with each other, characterized in that - in the cylinder wall (s) ( 4 ) of the bearing seat ( 3 ) of the mating ring ( 2 ) one / more annular groove (s) ( 8th ) are arranged, and - that in the bearing housing ( 1 ), into the annular groove (s) ( 8th ) leading inflow openings ( 9 ) are arranged, and - that on both sides of the / the annular groove / s ( 8th ) adjacent in the cylinder wall ( 4 ) of the bearing seat ( 3 ) of the mating ring ( 2 ) Sealing elements ( 10 ) are arranged, and - that in the mating ring ( 2 ) of the annular groove (s) ( 8th ), between the outer shell ( 11 ) of the mating ring ( 2 ) and the inner shell ( 12 ) of the mating ring ( 2 ), the counter ring ( 2 ) penetrating nozzle bores ( 13 ) are arranged. Mechanical seal and its arrangement according to claim 1, characterized in that in an annular groove ( 8th ) only one in the bearing housing ( 1 ) arranged inlet opening ( 9 ) leads. Mechanical seal and its arrangement according to claim 1, characterized in that in an annular groove ( 8th ) several in the bearing housing ( 1 ) arranged inlet openings ( 9 ) to lead. Mechanical seal and its arrangement according to claim 1, characterized in that between two adjacent annular grooves ( 8th ) one or more sealing elements ( 10 ) are arranged. Mechanical seal according to claim 1, characterized in that the nozzle bores ( 13 ) radially and parallel to the sealing surface ( 7 ) are arranged. Mechanical seal according to claim 1, characterized in that the nozzle bores ( 13 ) to the radial at an angle (α) inclined and parallel to the sealing surface ( 7 ) are arranged. Mechanical seal according to claim 1, characterized in that the nozzle bores ( 13 ) radially and parallel to the sealing surface ( 7 ) are inclined at an angle (β). Mechanical seal according to claim 1, characterized in that the nozzle bores ( 13 ) to the radial at an angle (α) inclined, and to the parallels to the sealing surface ( 7 ) are inclined at an angle (β). Mechanical seal according to claim 1, characterized in that each one of an annular groove ( 8th ) associated nozzle bores ( 13 ) to the lower edge of the groove "shifted" and by the angle (β) to the parallel to the sealing surface ( 7 ) is inclined to "down". Mechanical seal and its arrangement according to claim 1, characterized in that in the bearing housing ( 1 ) as sealing elements ( 10 ) Round rings (O-rings) are arranged.