CN111237465A - Sealing device and sealing method for moving shaft - Google Patents

Abstract

The invention discloses a moving shaft sealing device, which is arranged outside a moving shaft and used for sealing between the moving shaft and a base, and comprises: the moving shaft forms a sealing medium side and a non-sealing medium side on two sides of the sealing device; the first sealing mechanism is wrapped on the outer sealing medium side of the moving shaft, the second sealing mechanism is wrapped on the outer non-sealing medium side of the moving shaft, and the second sealing mechanism is detachable; the first sealing mechanism comprises two states, wherein the first state is a daily state, the first sealing mechanism is not sealed with the moving shaft, and the second sealing mechanism tightly wraps the moving shaft to realize sealing; the second state is a replacement state, the first sealing mechanism is in sealing contact with the moving shaft and used for blocking the fluid on the sealing medium side from flowing out, and the second sealing mechanism can be taken out and replaced; the invention also discloses a sealing method, which can ensure the sealing performance of the non-sealing medium side in a normal use state and a second sealing mechanism maintenance state, is convenient to maintain the sealing mechanism and prolongs the service life.

Description

Sealing device and sealing method for moving shaft

Technical Field

The present invention relates to a sealing device and a sealing method, and more particularly, to a sealing device and a sealing method for a movable shaft.

Background

In the prior art, a driving shaft of a gate, a driving shaft of a ship, and an output shaft driving a pump valve switch all need to work in a medium (such as in liquid and gas) for a long time, such driving shaft is generally called a moving shaft, and the moving mode of the moving shaft includes a rotating motion and a reciprocating motion, which can be respectively called a rotating motion shaft and a reciprocating motion shaft, and the moving shaft is used for driving the gate to open and close or driving a rotating shaft and a propeller exposed in water to propel by a ship host machine, so that the moving shaft has a near-water end (or called a "sealing medium side") and a far-water end (or called a "non-sealing medium side"), the non-sealing medium side is a fluid-free working environment, and the sealing medium side is exposed in a fluid, for example, the near-water end is exposed in. The sealing medium side and the non-sealing medium side need to be isolated in a leakage-proof way.

Taking a gate as an example, in the prior art, there is a steel dam gate, which mainly comprises a bottom shaft, wherein the bottom shaft is installed on a plurality of hinged supports fixedly arranged at the bottom of a river channel, two ends of the bottom shaft penetrate through wall bodies at two sides of the river channel and extend into a hoist chamber, a hoist is arranged in the hoist chamber, two ends of the bottom shaft are connected with the hoist through a crank arm, and a gate blade for blocking water is welded on the bottom shaft. When the hoist works, the bottom shaft can be driven to rotate by the crank arm, so that the door leaf stands to block water or is laid down to discharge water. In order to avoid water in a river channel from leaking into the headstock gear chamber, a sealing device is required to be used for sealing between the bottom shaft and the wall body, the sealing filler is required to ensure that the rotary motion of the bottom shaft is not influenced by the sealing filler and can realize sealing in a rotary state, and meanwhile, the price and the cost are also considered, so the sealing filler in the sealing device is usually soft materials such as rubber sealing filler and the like, but the service life of the materials is limited, the sealing filler is reduced along with the increase of the service time of a steel dam, the sealing device starts to leak water, the water penetrates through the wall from the two ends of the shaft to enter the headstock gear chamber, and the normal work of a driving mechanism is influenced or even accidents occur.

The existing sealing device is complex in structure, the technical problem that how to replace an aged sealing material in an underwater state is not solved, once the steel dam gate is put into use, the bottom shaft is located at the bottom of a river for a long time, when the sealing material outside the bottom shaft is replaced, the underwater environment is inconvenient to operate, water is pumped out and is impractical, when the sealing material is replaced, because the water pressure in the river is higher than that in an opening and closing machine chamber, the sealing device can flow into the opening and closing machine chamber once a large amount of water is removed, and the replacement difficulty is increased.

The invention provides the moving shaft sealing device which is simple in structure and good in effect, and common sealing filler in the moving shaft sealing device is convenient to replace, so that a good solution is provided for equipment (such as a ship rotating shaft) or engineering (such as a steel dam rotating shaft) needing a moving shaft.

Disclosure of Invention

The invention provides a moving shaft sealing device, which is applied to a moving shaft which partially penetrates through a medium, wherein the moving shaft penetrates through the medium and does not penetrate through the boundary position of the medium and is sealed by using the sealing device, and in addition, the sealing material in the sealing device can be replaced.

The purpose of the invention can be realized by the following technical scheme: a moving shaft sealing device has a base through which a moving shaft passes, the base supporting the moving shaft; the motion shaft sealing device is installed outside the motion shaft for sealing between the motion shaft and the base, and comprises: the first sealing mechanism and the second sealing mechanism are arranged in the sealing groove; at least one part of the moving shaft is outside the fluid space, and a sealing medium side and a non-sealing medium side are formed at two side positions of the sealing device;

the first sealing mechanism is wrapped on the outer sealing medium side of the moving shaft, the second sealing mechanism is wrapped on the outer non-sealing medium side of the moving shaft, and the second sealing mechanism is detachable;

the first sealing mechanism comprises at least two states: in the first state, the first sealing mechanism and the moving shaft are not sealed, and the second sealing mechanism tightly wraps the moving shaft and is used for blocking the fluid on the sealing medium side from flowing out; in the second state, the first sealing mechanism is arranged in sealing contact with the moving shaft for blocking the fluid on the sealing medium side from flowing out.

Furthermore, the moving shaft sealing device also comprises a fixed sleeve, and the fixed sleeve and the base are sealed; the first sealing mechanism is movable, and in a first state, the first sealing mechanism is sealed with the fixed sleeve; in the second state, the first sealing mechanism is sealed with the base and the moving shaft.

Further, in the first state, the first sealing mechanism and the fixed sleeve are sealed to form at least one third sealing surface, and the fluid on the sealing medium side is blocked by the third sealing surface and the second sealing mechanism; in the second state, at least one first sealing surface is formed between the first sealing mechanism and the base, at least one second sealing surface is formed between the first sealing mechanism and the moving shaft, and the fluid on the sealing medium side is blocked by the first sealing surface and the second sealing surface.

Further, the moving shaft sealing device also comprises a second connecting piece, and the fixing sleeve and the base can be connected through the second connecting piece; or the fixing sleeve and the base can be connected by welding; the fixing sleeve and the base can also be arranged into an integral structure, namely the fixing sleeve can be a part of the base.

Further, the first sealing mechanism comprises a first sealing element and an adjusting sleeve, the adjusting sleeve is connected with the first sealing element, and the adjusting sleeve can move axially.

Further, the moving shaft sealing device also comprises a first connecting piece, and the first sealing piece is connected with the adjusting sleeve through the first connecting piece; or the first sealing element is connected with the adjusting sleeve through welding; in the present invention, the first sealing member and the adjustment sleeve may be provided as an integral structure.

Furthermore, the adjusting sleeve is provided with an adjusting piece, one end of the adjusting piece acts on the fixing sleeve, the adjusting piece can drive the adjusting sleeve to move along the axial direction, and the adjusting sleeve can drive the first sealing piece to move.

Further, the adjusting member comprises an adjusting member and an adjusting releasing member, the adjusting member is configured to drive the adjusting sleeve to move towards the sealing medium side, and the adjusting sleeve drives the first sealing member to move towards the sealing medium side; the adjusting and loosening piece is configured to drive the adjusting sleeve to move towards the non-sealing medium side, and the adjusting sleeve drives the first sealing piece to move towards the non-sealing medium side.

Further, the moving shaft sealing device further comprises a bolt, the second sealing mechanism comprises a gland and a sealing material, the gland is connected with the adjusting sleeve through the bolt, and the sealing material is filled between the adjusting sleeve and the moving shaft and is pressed through the gland. In the present invention, the sealing material and the adjustment sleeve may be provided in contact with each other, or the sealing material and the adjustment sleeve may be provided out of contact with each other.

Further, the moving shaft is a rotating moving shaft or a reciprocating moving shaft. The rotary motion shaft is a cylinder, and rotates around the axis by taking the center line of the cylinder as the axis; the reciprocating shaft is a cylinder and moves along the direction parallel to the axial direction of the cylinder.

Further, the first sealing element is made of one or more of copper, copper alloy, aluminum alloy, steel, stainless steel, nylon, engineering plastic and modified nylon.

Furthermore, the sealing material is one or more of a 0-type sealing ring, a lip-shaped sealing ring, a square sealing ring, water-swelling rubber, a V-shaped combined sealing ring or a packing.

The invention also discloses a sealing method, which comprises the following steps:

a. adjusting the adjusting piece, wherein the first sealing mechanism moves towards the sealing medium side, the first sealing mechanism extrudes the base to form at least one first sealing surface, and the first sealing mechanism extrudes the moving shaft to form at least one second sealing surface;

b. disassembling the gland, taking out the original sealing material in the second sealing mechanism, and maintaining or replacing the original sealing material;

c. the repaired or replaced sealing material is put in, a gland is installed, and the sealing material in the second sealing mechanism is compressed to realize sealing;

d. and adjusting the adjusting and loosening piece, moving the first sealing mechanism to the non-sealing medium side, and extruding the fixed sleeve by the first sealing mechanism to form at least one third sealing surface.

In addition, according to the application and installation mode of different motion shafts, one end of each motion shaft can be in a fluid space, and the other end of each motion shaft is outside the fluid space, for example, in the application of a bottom shaft of a steel dam gate, one end of the bottom shaft serving as a rotation motion shaft is in a water body, and the other end of the bottom shaft is in a hoist chamber; the motion axis can also be one end outside the fluid space and the other end is flush with the water-contacting interface of the base; the motion shaft may also be a part of the middle outside the fluid space with both ends extending out of the fluid space through the base, such as a land drive shaft of an amphibious vehicle which drives wheels for land travel, the middle of the drive shaft being in the water free space of the vehicle body and both ends extending out of the vehicle body, the drive shaft being in water with both ends when traveling in water.

The invention not only can be suitable for sealing the rotating motion shaft of the steel dam gate, but also is suitable for wading engineering of ships and the like, such as the water prevention of the joint of a ship driving shaft and a propeller.

The invention has the following beneficial effects:

(1) the daily sealing material in the second sealing mechanism is conveniently replaced, fluid on the sealing medium side is blocked by the first sealing mechanism during replacement, the fluid cannot permeate into the position of the second sealing mechanism, and the maintenance difficulty of the second sealing mechanism is reduced.

(2) The invention can be applied to the steel dam gate, can still ensure the waterproof effect in the headstock gear chamber during maintenance, can prevent water in a river channel from permeating into the headstock gear chamber when the sealing material in the second sealing mechanism is replaced, can well protect the indoor mechanism of the headstock gear chamber, and ensures the safety and the replacement efficiency of the headstock gear chamber.

(3) The rotary motion shaft can rotate freely and the opening and closing of the indoor waterproof effect is good in the normal state. When the rotary motion shaft is normally used, the first sealing mechanism is not sealed with the motion shaft, the second sealing mechanism is used for sealing, the rotary motion shaft can rotate freely, water in a river channel cannot permeate into the opening and closing machine chamber, and the sealing effect is good.

(4) After the invention is applied to the gate of the steel dam, the service life of the gate of the steel dam is prolonged. The first sealing mechanism is made of materials which are difficult to age, wear-resistant and tough, such as copper, copper alloy, aluminum alloy, steel, stainless steel, nylon, engineering plastics, modified nylon and the like, and sealing is achieved through extrusion, meanwhile, the materials are difficult to age after being soaked in water for a long time, and the sealing effect can be kept good for a long time; when the steel dam gate is normally used, the first sealing mechanism is not sealed with the moving shaft, the sealing device is mainly sealed by the second sealing mechanism, the sealing material of the second sealing mechanism is rubber, a good waterproof effect can be achieved, the rotation of the rotating moving shaft is not influenced, however, the rubber material is easy to age, and when the sealing material in the second sealing mechanism is aged, the rubber material can be replaced in time, so that the whole service life of the steel dam gate is prolonged.

(5) The rotary motion shaft seal is low cost. According to the invention, materials such as copper, copper alloy, aluminum alloy, steel, stainless steel, nylon, engineering plastics, modified nylon and the like can be added only at the positions of at least three sealing surfaces of the first sealing element, so that the cost can be effectively reduced, and a good waterproof effect can be achieved.

(6) The invention can be applied to the sealing of various liquids using a moving axis scene, such as the sealing of food and chemical raw materials.

(7) The invention is also applicable to gas sealing in the case of using a moving shaft.

Drawings

FIG. 1 is a schematic diagram of an overall structure of a compact embodiment of the present invention;

FIG. 2 is an enlarged view of a portion I of FIG. 1, which is a structural diagram of a first embodiment in a first state;

FIG. 3 is a partial enlarged view of section II in FIG. 1, which is a structural schematic diagram of the first embodiment in state two;

FIG. 4 is a schematic overall structure diagram of a second embodiment of the present invention;

FIG. 5 is a view taken along direction K in FIG. 4;

FIG. 6 is a partially enlarged view of portion A of FIG. 4, which is also a structural schematic diagram of the second embodiment in state one;

fig. 7 is a partially enlarged view of a portion B in fig. 4, which is also a structural schematic diagram of the second embodiment in the second state.

Reference numerals:

the first embodiment: the sealing device comprises a first sealing element 1, a fixed sleeve 2, an adjusting sleeve 3, a second sealing mechanism 4, a gland 401, a sealing material 402, a first connecting piece 5, a second connecting piece 6, an adjusting piece 7, a tightening piece 701, an adjusting piece 702, a bolt 8, a base 9, a moving shaft 10, a first sealing surface 11, a second sealing surface 12 and a third sealing surface 13;

second embodiment: the sealing device comprises a first sealing element 21, a fixed sleeve 22, an adjusting sleeve 23, a second sealing mechanism 24, a gland 241, a sealing material 242, a first connecting piece 25, a second connecting piece 26, an adjusting piece 27, an adjusting piece 271, an adjusting piece 272, a bolt 28, a base 29, a moving shaft 30, a first sealing surface 31, a second sealing surface 32 and a third sealing surface 33.

Detailed Description

In the description of the present invention, it is to be understood that the terms "near", "far", "sealing medium side", "non-sealing medium side", "one side", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features.

In the present invention, unless otherwise specifically stated or limited, the terms "connected," "sleeved," "provided," "mounted," "wrapped," and the like are to be construed broadly, e.g., as a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; the two structures can be directly connected or indirectly connected through an intermediate medium, and the two structures can be communicated with each other or the two structures can be in an interaction relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The technical scheme of the invention is further described by combining the attached drawings:

in a first embodiment of the present invention, as shown in fig. 1 to 3, the moving shaft sealing apparatus has a base 9, a moving shaft 10 passing through the base 9, the base 9 for supporting the moving shaft 10; the moving shaft sealing device is installed outside the moving shaft 10 for sealing between the moving shaft 10 and the base 9, and includes: a first sealing mechanism, a second sealing mechanism 4; one end of the moving shaft 10 extends into the fluid space, the other end extends out of the fluid space, and a sealing medium side and a non-sealing medium side are formed on two sides of the sealing device;

the first sealing mechanism is wrapped on the outer sealing medium side of the moving shaft 10, the second sealing mechanism 4 is wrapped on the outer non-sealing medium side of the moving shaft 10, and the second sealing mechanism 4 is detachable;

the moving shaft sealing device also comprises a fixed sleeve 2, the fixed sleeve 2 is arranged on the periphery of the first sealing mechanism, and the fixed sleeve 2 is sealed with the base 9;

the first sealing mechanism comprises at least two states: in the first state, the first sealing mechanism is sealed with the fixed sleeve 2, and the first sealing mechanism is not sealed with the moving shaft 10; in the second state, the first sealing mechanism seals with the base 9 and the moving shaft 10 for blocking the outflow of the fluid on the sealing medium side.

Further, the first sealing mechanism comprises a first sealing element 1 and an adjusting sleeve 3, and the adjusting sleeve 3 can move axially;

the first sealing element 1 can move, in a state I, at least one third sealing surface 13 is formed between the first sealing element 1 and the fixed sleeve 2 in a sealing mode, and fluid on the sealing medium side is blocked by the third sealing surface 13 and the second sealing mechanism 4; in the second state, at least one first sealing surface 11 is formed between the first sealing element 1 and the base 9, at least one second sealing surface 12 is formed between the first sealing element 1 and the moving shaft 10, the fluid on the sealing medium side is blocked by the first sealing surface 11 and the second sealing surface 12, furthermore, the moving shaft 10 is provided with a recess, the shape of the recess is not limited, and the recess comprises a step shape, a conical shape, a curved surface shape and the like, and the second sealing surface 12 forms a certain angle with the axial direction of the moving shaft 10.

Further, the adjusting sleeve 3 and the first sealing element 1 are connected through a first connecting piece 5, or are connected by welding.

Further, the fixing sleeve 2 is connected with the base 9 through a second connecting piece 6, or through welding.

Further, adjusting sleeve 3 is equipped with regulating part 7, the one end of regulating part 7 is used for on fixed cover 2, adjusting part 7 can drive adjusting sleeve 3 along axial displacement, adjusting sleeve 3 can drive first sealing member 1 removes.

Further, the adjusting member 7 includes an adjusting member 701 and an adjusting releasing member 702, the adjusting member 701 is configured to drive the adjusting sleeve 3 to move toward the sealing medium side, and the adjusting sleeve 3 drives the first sealing member 1 to move toward the sealing medium side; the adjusting and loosening element 702 is configured to drive the adjusting sleeve 3 to move to the non-sealing medium side, and the adjusting sleeve 3 drives the first sealing element 1 to move to the non-sealing medium side, or the adjusting sleeve 3 drives the first connecting element 5 to move to the non-sealing medium side, and the first connecting element 5 drives the first sealing element 1 to move to the non-sealing medium side.

The adjusting sleeve further comprises a bolt 8, the second sealing mechanism 4 comprises a gland 401 and a sealing material 402, the gland 401 is connected with the adjusting sleeve 3 through the bolt 8, and the sealing material 402 is filled between the adjusting sleeve 3 and the moving shaft 10 and is pressed through the gland 401. The sealing material 402 and the adjustment sleeve 3 may be provided in contact with each other or not. The sealing material 402 may be provided in one kind or plural kinds.

Further, the moving shaft 10 is a rotating moving shaft or a reciprocating moving shaft. Further, the motion shaft is a cylinder.

Further, the material of the first sealing element 1 is one or more of copper, copper alloy, aluminum alloy, steel, stainless steel, nylon, engineering plastic and modified nylon.

Further, the sealing material 402 is one or more of a 0-type sealing ring, a lip-shaped sealing ring, a square sealing ring, water-swellable rubber, a V-shaped combined sealing ring, or a packing.

In a second embodiment of the present invention, as shown in fig. 4 to 7, the moving shaft sealing device has a base 29 through which the moving shaft 30 passes, the base 29 supporting the moving shaft 30; the moving shaft sealing means is installed outside the moving shaft 30 for sealing between the moving shaft 30 and the base 29, and includes: a first sealing mechanism, a second sealing mechanism 24; one end of the moving shaft 30 extends into the fluid space, the other end extends out of the fluid space, and a sealing medium side and a non-sealing medium side are formed at the two sides of the sealing device;

the first sealing mechanism is wrapped on the outer sealing medium side of the moving shaft 30, the second sealing mechanism 24 is wrapped on the outer non-sealing medium side of the moving shaft 30, and the second sealing mechanism 24 is detachable;

the moving shaft sealing device further comprises a fixing sleeve 22, wherein the fixing sleeve 22 is arranged on the periphery of the first sealing mechanism, and the fixing sleeve 22 is sealed with the base 29;

the first sealing mechanism comprises at least two states: in the first state, the first sealing mechanism is sealed with the fixed sleeve 22, and the first sealing mechanism is not sealed with the moving shaft 30; in state two, the first seal seals against the base 29 and the moving shaft 30 for blocking the outflow of fluid on the sealing medium side.

Further, the first sealing mechanism comprises a first sealing member 21 and an adjusting sleeve 23, and the adjusting sleeve 23 can move axially;

the first sealing element 21 can be moved, in a state I, at least one third sealing surface 33 is formed between the first sealing element 21 and the fixing sleeve 22 in a sealing mode, and the fluid on the sealing medium side is blocked by the third sealing surface 33 and the second sealing mechanism 24; in the second state, at least one first sealing surface 31 is formed between the first sealing member 21 and the base 29, at least one second sealing surface 32 is formed between the first sealing member 21 and the moving shaft 30, the fluid on the sealing medium side is blocked by the first sealing surface 31 and the second sealing surface 32, further, the outer surface of the moving shaft 30 is not recessed or protruded, and the second sealing surface 32 is parallel to the axial direction of the moving shaft 30.

Further, the adjusting sleeve 23 is connected to the first sealing member 21 by a first connecting member 25, or by welding.

Further, the fixing sleeve 22 is connected to said base 29 by means of a second connection element 26, or by welding.

Further, the adjusting sleeve 23 is provided with an adjusting member 27, one end of the adjusting member 27 acts on the fixing sleeve 22, the adjusting member 27 can drive the adjusting sleeve 23 to move along the axial direction, and the adjusting sleeve 23 can drive the first sealing member 21 to move.

Further, the adjusting member 27 includes an adjusting member 271 and an adjusting member 272, the adjusting member 271 is configured to drive the adjusting sleeve 23 to move toward the sealing medium side, the adjusting sleeve 23 drives the first sealing member 21 to move toward the sealing medium side, and further, the first sealing member 21 can also move slightly toward the moving shaft 30; the adjusting member 272 is configured to drive the adjusting sleeve 23 to move toward the non-sealing medium side, the adjusting sleeve 23 drives the first sealing member 21 to move toward the non-sealing medium side, or the adjusting sleeve 23 drives the first connecting member 25 to move toward the non-sealing medium side, and the first connecting member 25 drives the first sealing member 21 to move toward the non-sealing medium side, further, the first sealing member 21 can also move slightly away from the moving shaft 30.

Further, as shown in fig. 5, the tightening member 271 and the loosening member 272 are spaced apart from each other.

Further, the moving shaft sealing device further includes a bolt 28, the second sealing mechanism 24 includes a gland 241 and a sealing material 242, the gland 241 is connected with the adjusting sleeve 23 through the bolt 28, and the sealing material 242 is filled between the adjusting sleeve 23 and the moving shaft 30 and is compressed by the gland 241. The sealing material 242 and the adjustment sleeve 23 may be provided in contact with each other or not. The sealing material 242 may be provided in one kind or plural kinds.

Further, the moving shaft 30 is a rotating moving shaft or a reciprocating moving shaft.

The materials of the first seal member 21 and the sealing material 242 in the second embodiment may be the materials in the first embodiment.

Further, the moving shaft 30 is a rotating moving shaft or a reciprocating moving shaft. Further, the motion shaft is a cylinder.

The third embodiment is a sealing method using the moving shaft sealing device of the first embodiment to realize sealing, and comprises the following steps:

a. adjusting the adjusting piece 701, wherein the adjusting sleeve 3 moves towards the sealing medium side, the adjusting sleeve 3 drives the first sealing element 1 to move towards the sealing medium side, and the first sealing element 1 and the base 9 are extruded to form at least a first sealing surface 11; the first sealing element 1 is extruded with the moving shaft 10 to form at least a second sealing surface 12, and when the first sealing surface 11 and the second sealing surface 12 obstruct the fluid on the sealing medium side, the adjustment of the tightening piece 701 is stopped and the position of the tightening piece 701 is fixed;

b. the gland 401 is disassembled, the original sealing material 402 of the second sealing mechanism 2 is taken out, and the original sealing material 402 is maintained or replaced;

c. the repaired or replaced sealing material is put in, the gland 401 is installed, and the sealing material in the second sealing mechanism 2 is compressed to realize sealing;

d. when the adjusting and loosening member 702 is adjusted, the adjusting sleeve 3 moves towards the direction of the non-sealing medium side, the adjusting sleeve 3 drives the first sealing element 1 to move towards the non-sealing medium side, and the first sealing element 1 extrudes the fixed sleeve 2 to form at least a third sealing surface 13.

Further, the gland 401 can be detached and attached by bolts 8.

When the adjusting sleeve 3 is adjusted, the adjusting sleeve 3 can directly drive the first sealing element 1 to move, or the adjusting sleeve 3 can drive the first connecting piece 5 to drive the first sealing element 1 to move; when the adjusting member 701 is adjusted, the first sealing member 1 finally reaches the second state, and the first sealing surface 11 and the second sealing surface 12 realize sealing; when the adjusting member 702 is adjusted, the first sealing mechanism finally reaches the first state, and the third sealing surface 13 and the sealing material 402 of the second sealing mechanism achieve sealing.

The sealing is realized by using the moving shaft sealing device of the second embodiment, and the sealing method comprises the following steps:

a. the adjusting member 271 is adjusted, the adjusting sleeve 23 moves towards the direction of the sealing medium side, the adjusting sleeve 23 drives the first sealing member 21 to move towards the sealing medium side, further, the first sealing member 21 can also move slightly close to the moving shaft 30, the first sealing member 21 presses the base 29 to form at least a first sealing surface 31, the first sealing member 21 presses the moving shaft 30 to form at least a second sealing surface 32, and after the first sealing surface 31 and the second sealing surface 32 block the fluid at the sealing medium side, the adjusting member 271 is stopped being adjusted and the position of the adjusting member 271 is fixed;

b. the gland 241 is removed, the original sealing material 242 in the second sealing mechanism 24 is taken out, and the original sealing material is repaired or replaced;

c. the repaired or replaced sealing material is put in, and the mounting gland 241 compresses the sealing material in the second sealing mechanism to realize sealing;

d. and the adjusting and loosening element 272 is adjusted, the adjusting sleeve 23 moves towards the direction of the non-sealing medium side, the adjusting sleeve 23 drives the first sealing element 21 to move towards the non-sealing medium side, the first sealing element 21 can further move towards the direction far away from the moving shaft 30 slightly, and the first sealing element 21 presses the fixing sleeve 22 to form at least a third sealing surface 33.

Further, the gland 241 may be detached and installed by the bolts 28.

The technical effects of the above embodiment can be popularized to the water prevention of the joint of the driving shaft and the propeller of the ship and any water-involved engineering that the non-sealing medium side of the moving shaft needs water prevention, the service life of the sealing mechanism is prolonged, and the replacement and maintenance of the sealing material are convenient. The invention can also be popularized and applied to the sealing of gas, such as the sealing of chemical gas and the like.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the examples, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and variations can be made by persons skilled in the art without departing from the principles of the invention and should be considered as within the scope of the invention.

Claims (13)

1. A moving shaft sealing device has a base through which a moving shaft passes, the base supporting the moving shaft; the motion shaft sealing device is installed outside the motion shaft and used for sealing between the motion shaft and the base, and is characterized by comprising: the first sealing mechanism and the second sealing mechanism are arranged in the sealing groove; at least a part of the moving shaft is outside the fluid space, and a sealing medium side and a non-sealing medium side are formed on two sides of the sealing device;

the first sealing mechanism is wrapped on the outer sealing medium side of the moving shaft, the second sealing mechanism is wrapped on the outer non-sealing medium side of the moving shaft, and the second sealing mechanism is detachable;

the first sealing mechanism comprises at least two states: in the first state, the first sealing mechanism and the moving shaft are not sealed, and the second sealing mechanism tightly wraps the moving shaft and is used for blocking the fluid on the sealing medium side from flowing out; in the second state, the first sealing mechanism is arranged in sealing contact with the moving shaft for blocking the fluid on the sealing medium side from flowing out.

2. The moving shaft seal as defined in claim 1 further including a boot, said boot sealing between said base; the first sealing mechanism is movable, and in a first state, the first sealing mechanism is sealed with the fixed sleeve; in the second state, the first sealing mechanism is sealed with the base and the moving shaft.

3. A moving shaft seal assembly as claimed in claim 2 wherein in condition one, said first seal means seals against the stationary sleeve to form at least a third seal face, and fluid on the sealing medium side is blocked by said third seal face and said second seal means; in the second state, at least one first sealing surface is formed between the first sealing mechanism and the base, at least one second sealing surface is formed between the first sealing mechanism and the moving shaft, and the fluid on the sealing medium side is blocked by the first sealing surface and the second sealing surface.

4. The moving shaft seal assembly as claimed in claim 2 further including a second connector, said harness being connected to said base by said second connector; or the fixed sleeve is connected with the base in a welding mode.

5. A moving shaft seal as claimed in claim 3 in which the first seal means comprises a first seal, an adjustment sleeve connected to the first seal, the adjustment sleeve being axially movable.

6. The moving shaft seal assembly as claimed in claim 5 further including a first connector by which said first seal member is connected to said adjustment sleeve; or the first sealing element is connected with the adjusting sleeve by welding.

7. A moving shaft seal according to claim 5, characterised in that the adjusting sleeve is provided with an adjusting element, one end of which acts on the fixing sleeve, the adjusting element being able to bring about an axial movement of the adjusting sleeve, which is able to bring about a movement of the first sealing element.

8. The moving shaft sealing device as claimed in claim 7, wherein said adjusting member includes an adjusting member and an adjusting member, said adjusting member being configured to move said adjusting sleeve toward the sealing medium side, said adjusting sleeve moving said first sealing member toward the sealing medium side; the adjusting and loosening piece is configured to drive the adjusting sleeve to move towards the non-sealing medium side, and the adjusting sleeve drives the first sealing piece to move towards the non-sealing medium side.

9. The moving shaft seal device according to claim 5, further comprising a bolt, wherein the second seal mechanism comprises a gland connected with the adjusting sleeve by the bolt, and a seal material filled between the adjusting sleeve and the moving shaft and compressed by the gland.

10. The moving shaft sealing device according to any one of claims 1 to 9, wherein the moving shaft is a rotating moving shaft or a reciprocating moving shaft.

11. A moving shaft seal according to any one of claims 5 to 9, characterised in that the material of the first seal is one or more of copper, copper alloy, aluminium alloy, steel, stainless steel, nylon, engineering plastics, modified nylon.

12. The moving shaft sealing apparatus according to claim 9, wherein the sealing material is one or more of a 0-ring, a lip ring, a square ring, a water-swellable rubber, a V-pack ring, or a packing.

13. A method of sealing, comprising the steps of:

a. adjusting the adjusting piece, wherein the first sealing mechanism moves towards the sealing medium side, the first sealing mechanism extrudes the base to form at least one first sealing surface, and the first sealing mechanism extrudes the moving shaft to form at least one second sealing surface;

b. disassembling the gland, taking out the original sealing material in the second sealing mechanism, and maintaining or replacing the original sealing material;

c. the repaired or replaced sealing material is put in, a gland is installed, and the sealing material in the second sealing mechanism is compressed to realize sealing;

d. adjusting the adjusting and loosening piece, wherein the first sealing mechanism moves to the non-sealing medium side; the first sealing mechanism presses the fixed sleeve to form at least one third sealing surface.

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