FI119003B - Gasket assembly for pump, includes mechanical gasket that is arranged in conjunction with detachable component of drive shaft - Google Patents

Abstract

The assembly includes a mechanical gasket (7) that is arranged in conjunction with a detachable component (4) of a drive shaft. The detachable component of the drive shaft between other components (3,5) of the drive shaft, includes a slot structure (8) so as to be compacted in a longitudinal direction. Independent claims are included for the following: (1) method for detaching gasket assembly; and (2) use of gasket.

Description

119003

SCREW PUMP AND METHOD TO REPLACE PUMP SEAL

FIELD OF THE INVENTION

The invention relates to a screw pump as defined in the preamble of claim 1 and to a method for changing the seal of a screw pump as defined in the preamble of claim 9.

BACKGROUND OF THE INVENTION

10 Various screw pumps are known in the art. The screw pump is typically single, double or triple screw. In the screw pump, the pumped material is sucked in from the suction side and discharged from the discharge side. Is provided to the drive pressure differential and the suction pressure of between 15 side.

One known and widely used type of screw pump is an eccentric screw pump, which is particularly used for the transfer of viscous fiber suspensions and viscous masses.

20 Depending on the direction of rotation of the pump head bearing part, which connects the pump body to the power unit, and • · · v ί depending on the direction of rotation of the pump, it must be replaced from time to time: T: To maintain pump tightness. Today, the seal; ***; 25 replacement is slow because the pump bearing section * · ·: must first be disconnected from the power unit. After that, the broad • · · ·. ·· *. the connection between the ceramic part and the suction or pressure chamber must be • open before the mechanical change can be made. , nos seal. This is also expensive considering the time it takes to • · · “j / 30 process shut down, dismantle the pump, and replace the gasket •« * ··. *.

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..... * PURPOSE OF THE INVENTION

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The object of the invention is to eliminate the disadvantages mentioned above. It is a further object of the invention to provide a novel screw pump design and method for replacing a screw pump seal without disassembling the pump. In particular, it is an object of the invention to provide a new, faster and easier way to replace the screw seal of a 5 screw pump by a redesigned screw pump design.

SUMMARY OF THE INVENTION

The screw pump according to the invention and the method for replacing its gasket are characterized by what is claimed.

The invention is based on a screw pump having a pump body and a power unit comprising a suction space, a pressure space, a screw channel arranged between the suction and pressure space and a bearing part sealed to one end of the suction or pressure space In addition, the pump housing includes a drive shaft for transferring the power of the power unit 20 to at least one drive screw located in the screw channel. According to the invention, the drive shaft is. ; formed by at least three parts, first, · · · J. / second and third, which are connected to each other to disengage i. The second part of the drive shaft is arranged between the first and third parts and - • · in connection with the bearing section. The second part of the drive shaft is arranged to be disengaged from the first and ··· third parts. Depending on the direction of rotation of the bearing member and the pump, the • 30 sealing point between the suction or pressure chamber is arranged on the second drive shaft · ♦ · ·. · * ·. part. In addition, the second part of the drive shaft includes means for arranging it in the longitudinal ♦ · * ··· *. The outer housing of the bearing part is provided with an opening * '* · through which the second part of the drive shaft, which is provided with a seal, can be disassembled first, · · · · removable from the bearing part, 3 119003, and through which the second part of the drive shaft, together with the gasket, can be disposed within the bearing part, arranged at a normal length in the longitudinal direction and connected to the first and third parts of the drive shaft.

Drive screw11a is used herein to mean any drive screw, rotor or the like, known per se, used in any kind of screw pump.

In one embodiment of the invention, the opening provided in the outer housing of the bearing section is sealable. In one embodiment, the opening is located on the side of the bearing member.

In one embodiment of the invention, the seal 15 is arranged movable along a second portion of the drive shaft in the longitudinal direction of the drive shaft. The seal may be secured to the other portion by screws which are loosened before moving the seal. In one embodiment, the seal is a mechanical seal. The seal is preferably arranged at the second part of the drive shaft, not between the suction / pressure chamber and the bearing part.

• ·:. * ·· In the case of screw pumps according to the invention,: T: when one part of the drive shaft together with the seal: * · *: 25 is removed from the pump body, in connection with the other part * · ** '. existing gasket will be replaced or replaced. Gasket can- • · • * j, ·. also only repair or clean. Less often the second part of the drive shaft is shifted, although this is also possible due to the design of the invention.

In one embodiment of the invention, the second part of the drive shaft is connected to the first and third parts of the drive shaft by means of connecting means, e.g., connectors, screws, * flanges or the like.

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In one embodiment of the invention, the screw pump is an eccentric screw pump. The advantages of an eccentric screw pump include • i · · * flowless pulsation and low abrasion.

• a • · ♦ ·· 4 119003

In one embodiment of the invention, the coupling point between the first and second portions of the drive shaft is arranged at an area between the bearing section and the pump coupling, depending on the direction of rotation of the pump.

In a preferred embodiment, the junction between the second and third parts of the drive shaft is arranged inside the bearing part.

In one embodiment, the power unit is an electric 10 motor or other drive. The drive shaft is rotated by the power unit, whereby the drive power of the pump is applied to the drive screw or rotor. As it rotates, the drive screw or rotor conveys the pumped material from the suction side to the pressure side.

Furthermore, the invention is based on a method for replacing and / or repairing the screw pump seal described above without disassembling the pump. According to the invention, through the opening provided in the outer housing of the bearing part, the second part of the drive shaft is disengaged from the third part 20, arranged longitudinally, disengaged from the first part and removed from the bearing part provided with it. It stayed • · · *. The second part of the drive shaft, together with the replaced or ··· ϊ ^ ϊ: 25 repaired gasket, is provided inside the bearing part by the opening of the outer housing of the bearing part. : *; , the second part of the drive shaft is first connected · · · · · · · ·. to the earthly portion, arranged in the normal length in the longitudinal direction and connected to the third portion.

. . In a preferred embodiment, the gasket is renewed • * · * '* *. In an alternative embodiment, the seal is repaired.

In one embodiment of the invention, before disengaging the second portion of the drive shaft from the first portion 35, the seal adjacent the second portion is moved • · · • along the second portion longitudinally of the drive shaft, preferably to the third portion. .

5, 119003

In one embodiment of the invention, after securing the second portion of the drive shaft to the first portion, the seal associated with the second portion is moved along the second portion longitudinally to the normal position of the seal, preferably toward the first portion.

The structure of the invention enables the seal to be replaced very quickly, inexpensively and simply without disassembling the pump body or removing the power unit. Thanks to the invention, the maintenance time is reduced and the maintenance costs are reduced.

The pump structure according to the invention is suitable for use in any application and conditions for pumping various liquids, suspensions, rigid pulps or the like, for example, in the paper and pulp industry, waste water treatment and various chemical industry processes.

LIST OF FIGURES

The invention will now be described, by way of example, in detail, with reference to the accompanying drawing, in which: Fig. 1 shows a cross-sectional view of a bearing of a screw pump bearing according to the invention.

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DETAILED DESCRIPTION OF THE INVENTION

Conventional designs of screw pumps are known and described in general terms above, and will not be described herein in more detail: K: 3O min. Important to the invention are the structural modifications which provide for the replacement of one of the two parts of the drive shaft - ** # without the disassembly of the pump ♦ *.

*. * Figure 1 shows a longitudinal: ***: cross-sectional view of the structure of a non-: ·: 35 central screw pump bearing member according to the invention.

• · «119003

6 I

In the eccentric screw pump of Figure 1, the bearing member 1 is connected by a flange connection at its first end to the suction space 13. An electrical motor 14 is connected to the other end of the bearing member, from which power is provided to the rotor disposed in the screw channel. In the eccentric screw pump of the embodiment of Figure 1, the material to be pumped is sucked into the pump suction space through an inlet port. From the suction space, the material is led, into a screw channel having at least one drive screw or rotor.

Screw duct 10 is guided through the discharge opening out of the pressure from the pump to a higher pressure state.

In the embodiment of Fig. 1, the drive shaft 2 is formed by a first part 3, a second part 4 and a third part 5 connected by means of connectors 9, 12 15 such that the second part 4 is easily removable from the first part 3 and third part 5. The connection point 10 between the first 3 and the second part 4 of the drive shaft is arranged substantially in the region 6 of the connection between the suction space 13 and the bearing part 1.

The junction 11 between the second 4 and the third 5 parts of the drive shaft is arranged inside the bearing part 1.

A third part 5 is connected at one end to an electric motor V * 14 14. The first 3 and second 4 parts and the second 4 and itJ: the third 5 parts are connected to each other by a screw connection, · *; the parts are fixed to each other by screws 9, 12.

•. ** \ The flange connection 6 between the bearing part 1 and the suction chamber 13 is sealed by a mechanical seal 7

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by means of which is arranged in connection with the second part 4 • of the drive shaft such that the seal 7 is not between the bearing part,, 30 and the suction space connection 6. Sealing • · ·: * j: Fits against flange connection 6. The gasket 7 is arranged to be movable along a second portion 4 · * '* · of the drive shaft in the longitudinal direction of the drive shaft 2. The second part I · · · 4 of the drive shaft is provided with a groove structure along which the seal 35 7 is movable. The seal 7 can be attached to the other part 4 by screws ·· · • · · ί · *.

• · • * * · 7 119003

Further, the second part 4 of the drive shaft includes means for arranging it in the longitudinal direction (not shown). The second part 4 may include a groove shaft structure whereby the second part can move freely in the longitudinal direction of the drive shaft and is thus compressible when the screws 12 of the screw connection 11 are opened.

The drive shaft 2 may be any drive shaft of known structure 10 with the exception that two connection points 10, 1i are provided substantially in connection with the bearing member 1 on the drive shaft 2.

Further, the outer housing of the bearing part 1 is provided with a closable opening (not shown in Fig. 15a), through which the second part 4 of the drive shaft can be detached from the third part 5 by loosening the screws 12, the seal can be moved 20 along the second portion 4 in the longitudinal direction toward the third portion 5, the second portion 4 is removable from the first portion 3 by loosening the screws 9 of the joint 10 and the drive shaft * · ·.

The other part 4 of the drive shaft 2 together with the gasket 7 is provided. can be mounted inside the bearing part 1, the second part 4 is ··:. can be connected to the first part 3 of the drive shaft by screws 9, 9, the seal 7 can be moved along the second part · 4 towards the first part 3 in its normal position, 30 and lockable with screws to the desired position • · «··· · 4 can be provided in the normal length with longitudinal * ... * pin 3a, can be connected to the third part 5 by means of a screw locking screw · '** · an opening in the outer housing 1 of the bearing part 1

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through.

• · • 35 Because the second part of the drive shaft is arranged in a I · · · ϊ. *

The size of the opening is preferably smaller than the length of the bearing member.

The embodiments of the invention are not limited to the examples shown, but may vary within the scope of the appended claims.

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Claims (11)

A screw pump, comprising a pump body and a power means, the pump body comprising a suction space, a pressure space, a screw channel arranged between the suction space and the pressure space, and a storage part (1) which, depending on the direction of rotation of the pump , is sealedly connected to one end of the suction or pressure space, by means of which the storage part of the pump body is connected to the power device, and a drive shaft (2), by means of which the drive power of the power device is transferred to the drive screw arranged in the screw channel, characterized in that , that the drive shaft (2) is formed of at least three parts, a first (3), a second (4) and a third (5) part which are releasably connected to each other; the second (4) portion of the drive shaft is disposed between the first (3) and the third (5) portion and substantially adjacent to the bearing portion (1); the second part (4) of the drive shaft is arranged to be detached from the first (3) and the third (5) part; a seal (7) for the junction between the bearing member (1) and, depending on the direction of rotation of the pump, the suction or pressure space (13) is arranged adjacent to the drive shaft *. * in second part (4); the second part (4) of the drive shaft comprises means * ··:.: for its longitudinal folding; and a heel is provided in the outer housing of the bearing member (1) through which the heel (2) of the drive shaft (4) together with the seal can be released from the first (3) and the third (5). a «. · * ·. the part, can be assembled longitudinally and can be withdrawn from the bearing part, and through which the heel of the drive shaft. The second part (4) together with the seal (7) can be arranged into the storage part, can be arranged to a normal length in the longitudinal direction and can be connected to the first and third parts of the drive shaft. • · · ....: 2. Screw pump according to claim 1, characterized by e - ·. The heel, which is arranged in the outer casing of the storage member (1), can be closed. • * · • I * I * * 13 119003 Screw pump according to claim 1 or 2, characterized in that the heel, which is arranged in the outer housing of the storage part (1), is located on the side of the storage part. Screw pump according to any of claims 1 to 3, characterized in that a seal (7) is arranged to be movable along the second part (4) of the drive shaft in the longitudinal direction of the drive shaft. Screw pump according to any of claims 1 - 10 4, characterized in that the seal (7) is a mechanical seal. Screw pump according to any of claims 1 to 5, characterized in that the second part (4) of the drive shaft is connected to the first (3) and the third (5) part with an attachment means (9, 12). Screw pump according to any of claims 1 - 6, characterized in that the screw pump is an eccentric screw pump. Screw pump according to any of claims 1 to 7, characterized in that the junction (5) between the first (3) and second (4) of the drive shaft (2) is arranged in the region of the junction (6) between: 1) and, depending on the rotation of the pump: * · *; direction, suction or pressure space (13). 25 9. A method for exchanging a seal in a. * ··, screw pump as claimed in any one of claims 1 - 8, characterized in that the "second part of the drive shaft (2) • * ♦ *". · (4) is released from the third part (5) via a heel which is # · * ··· * arranged in the outer casing of the storage part (1), longitudinally collapsed, is released from the first part (3) \ j .: and removed from the bearing part (1) with the seal (7), ··· 5. „ϊ which is arranged adjacent to it; the seal (7). ···. replaced or repaired; and the other part of the drive shaft (4) are arranged together with the seal (7) into the storage part • * (35) through the hole on the outer housing of the storage part, the second part (4) of the drive shaft is connected to the first part • · I · · · • ·· i * * 14 119003 (3), arranged to normal length and attached to the third part (5). 10. A method according to claim 9, characterized in that, before releasing the second part (4) of the drive shaft 5, from the first part (3), the seal (7) is moved in connection with the second part along the second part (4). ) in the longitudinal direction of the drive shaft (2). 11. A method according to claim 9 or 10, characterized in that after the second part (4) of the drive shaft 10 is attached to the first part (3), the seal (7) is moved in connection with the second part along the second part (4). the longitudinal direction of the drive shaft (2) to the normal position of the seal. Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa… aaa aaaaa aaa aaa aaa aa aaa a aa aa