CN111237465A - A kind of moving shaft sealing device and sealing method - Google Patents

Abstract

The invention discloses a moving shaft sealing device, which is installed outside the moving shaft and used for sealing between the moving shaft and the base. and the non-sealing medium side; the first sealing mechanism is wrapped on the sealing medium side outside the moving shaft, the second sealing mechanism is wrapped on the non-sealing medium side outside the moving shaft, and the second sealing mechanism is detachable; the first sealing mechanism includes two states, the state The first is the daily state, the first sealing mechanism is not sealed with the moving shaft, and the second sealing mechanism tightly wraps the moving shaft to achieve sealing; the second is the replacement state, where the first sealing mechanism is in sealing contact with the moving shaft to block the fluid from the sealing medium side. , the second sealing mechanism can be taken out and replaced; the invention also discloses a sealing method, the present invention can ensure the sealing performance of the non-sealing medium side in the normal use state and the maintenance state of the second sealing mechanism, and it is convenient to maintain the sealing mechanism and prolong the service life .

Description

A kind of moving shaft sealing device and sealing method

technical field

The invention relates to a sealing device and a sealing method, in particular to a moving shaft sealing device and a sealing method.

Background technique

In the prior art, whether it is the drive shaft of the gate, the drive shaft of the ship, or the output shaft that drives the pump valve switch, it needs to work in the medium (such as liquid and gas) for a long time. This kind of drive shaft is generally called a motion shaft. , The movement modes of the motion shaft include rotary motion and reciprocating motion, which can be called rotary motion shaft and reciprocating motion shaft respectively. The motion shaft is used to drive the opening and closing of the gate or the main engine of the ship drives the rotary shaft and the propeller exposed in the water for propulsion. Therefore, the moving shaft has a near water end (or "sealing medium side") and a far water end (or "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, eg, the near-water end is exposed to water. A leak-proof isolation is required between the sealed medium side and the non-sealed medium side.

Taking the gate as an example, in the prior art, there is a steel dam gate, its structure mainly includes a bottom shaft, the bottom shaft is installed on a plurality of hinge seats fixedly arranged at the bottom of the river channel, and the two ends of the bottom shaft pass through the two sides of the river channel. The wall extends into the hoist room, and the hoist room is provided with a hoist. Both ends of the bottom shaft are connected with the hoist through the arm, and the door leaf used for water blocking is welded on the bottom shaft. When the hoist is working, the bottom shaft can be driven to rotate by the crank arm, so that the door leaf can stand up to block the water or put it down to release the water. In order to prevent the water in the river from leaking into the hoist room, the bottom shaft and the wall need to be sealed with a sealing device. The requirement of the sealing packing is to ensure that the rotary motion of the bottom shaft is not affected by the sealing packing and can achieve a rotating state. At the same time, the price and cost are also considered. Therefore, the sealing packing in the sealing device is often made of soft materials, such as rubber sealing packing, etc., but the service life of such materials is limited. The performance decreases, the sealing device begins to leak, and the water enters the hoist room through the wall at both ends of the shaft, which affects the normal operation of the drive mechanism and even causes accidents.

The existing sealing device has a complex structure and does not solve the technical problem of how to replace the aging sealing material in the underwater state. Once the steel dam gate is put into use, the bottom shaft will be located at the bottom of the river for a long time. The underwater environment is inconvenient to operate, and it is impractical to drain the water. When replacing the sealing material, since the water pressure in the river channel is higher than that in the hoist room, once a large amount of water is removed from the sealing device, it will flow into the hoist room, increasing replacement. difficulty.

The invention provides a moving shaft sealing device with a simple structure but good effect, and the commonly used sealing packing in the moving shaft sealing device is easy to replace, which is suitable for equipment (such as ship rotating shaft) or engineering (such as steel dam rotating shaft) provides a good solution.

SUMMARY OF THE INVENTION

The present invention provides a moving shaft sealing device, which is applied to a moving shaft that partially passes through the medium. Materials can be replaced.

The object of the present invention can be achieved through the following technical solutions: a moving shaft sealing device, which has a base, the moving shaft passes through the base, and the base is used to support the moving shaft; the moving shaft sealing device is installed on the moving shaft It is used for sealing between the moving shaft and the base. The moving shaft sealing device includes: a first sealing mechanism and a second sealing mechanism; at least a part of the moving shaft is outside the fluid space, forming a sealing medium side at both sides of the sealing device and non-sealed medium side;

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

The first sealing mechanism includes at least two states: state 1, the first sealing mechanism and the moving shaft are set to be unsealed, and the second sealing mechanism tightly wraps the moving shaft to block the outflow of fluid on the side of the sealing medium; state Second, the first sealing mechanism and the moving shaft are arranged in sealing contact for blocking the outflow of the fluid on the side of the sealing medium.

Further, the moving shaft sealing device further includes a fixed sleeve, which is sealed between the fixed sleeve and the base; the first sealing mechanism is movable, and in the first state, the first sealing mechanism is sealed with the fixed sleeve ; In state two, the first sealing mechanism is sealed with the base and the moving shaft.

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

Further, the moving shaft sealing device further includes a second connecting piece, and the fixing sleeve and the base can be connected by the second connecting piece; or the fixing sleeve and the base can be connected by welding; this In the invention, the fixing sleeve and the base can also be provided as an integral structure, that is, the fixing sleeve can be a part of the base.

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

Further, the moving shaft sealing device further comprises a first connecting piece, the first sealing piece is connected with the adjusting sleeve through the first connecting piece; or the first sealing piece and the adjusting sleeve are connected by welding; the present invention , the first seal and the adjustment sleeve can be provided as an integral structure.

Further, the adjustment sleeve is provided with an adjustment piece, one end of the adjustment piece acts on the fixed sleeve, the adjustment piece can drive the adjustment sleeve to move in the axial direction, and the adjustment sleeve can drive the first seal Piece moves.

Further, the adjusting member includes a tightening member and a loosening member, the tightening member is configured to drive the adjusting sleeve to move toward the sealing medium side, and the adjusting sleeve drives the first sealing member to the sealing medium. The adjusting sleeve is configured to drive the adjusting sleeve to move to the non-sealing medium side, and the adjusting sleeve drives the first sealing member to move to the non-sealing medium side.

Further, the moving shaft sealing device further includes bolts, the second sealing mechanism includes a gland and a sealing material, the gland and the adjusting sleeve are connected by bolts, and the sealing material is filled between the adjusting sleeve and the adjusting sleeve. between the moving shafts, and are compressed by the gland. In the present invention, the sealing material and the adjusting sleeve may be set to be in contact, and the sealing material and the adjusting sleeve may also be set to not be in contact.

Further, the motion axis is a rotary motion axis or a reciprocating motion axis. In the present invention, the rotation axis is a cylinder, and the center line of the cylinder is used as the axis, and the rotation axis rotates around the axis; in the present invention, the reciprocating axis is a cylinder, and the reciprocating axis is along a direction parallel to the axial direction of the cylinder. sports.

Further, the material of the first seal is one or more of copper, copper alloy, aluminum, aluminum alloy, steel, stainless steel, nylon, engineering plastics, and modified nylon.

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

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

a. Adjust the tensioning member, the first sealing mechanism moves to the side of the sealing medium, the first sealing mechanism presses the base to form at least one first sealing surface, and the first sealing mechanism presses the moving shaft to form at least one second sealing surface;

b. Remove the gland, take out the original sealing material in the second sealing mechanism, and repair or replace the original sealing material;

c. Put in the repaired or replaced sealing material, install the gland, and press the sealing material in the second sealing mechanism to achieve sealing;

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

In addition, according to the use and installation method of different motion shafts, the motion shaft can be one end in the fluid space and one end outside the fluid space. For example, in the application of the bottom shaft of a steel dam gate, the bottom shaft is used as a rotating motion shaft. One end is in the water body, and the other end is in the water body. One end is in the hoisting machine room; one end of the moving shaft can also be outside the fluid space, and the other end is flush with the water-facing interface of the base; the moving shaft can also be a part in the middle outside the fluid space, and both ends protrude through the base In the fluid space, such as the land drive shaft of an amphibious vehicle, the land drive shaft drives the wheels to travel on land. The middle of the drive shaft is in the waterless space of the vehicle body, and the two ends extend out of the vehicle body. When traveling in water, the two end in water.

The present invention is not only applicable to the sealing of the rotary motion shaft of the steel dam gate, but also to water wading projects such as ships, such as the waterproofing of the connection between the ship's drive shaft and the propeller. The fluid of the present invention also includes food, chemical raw materials, etc. For gas sealing, that is, the present invention is applicable to any situation where the sealing medium side of the moving shaft is in the medium, and the non-sealing medium side needs to be outside the medium.

The present invention has the following beneficial effects:

(1) It is convenient to replace the daily sealing material in the second sealing mechanism. During replacement, the fluid on the sealing medium side is blocked by the first sealing mechanism and will not penetrate into the position of the second sealing mechanism, reducing the maintenance difficulty of the second sealing mechanism.

(2) The present invention can be applied to steel dam gates, and can still ensure the waterproof effect in the hoist machine room during maintenance. When replacing the sealing material in the second sealing mechanism, the water in the river will not seep into the hoist machine room, and it can be well The protection of the hoist indoor mechanism ensures the safety and replacement efficiency of the hoist room.

(3) In normal state, the rotary motion shaft can rotate freely and the indoor waterproof effect is good. When the rotary motion shaft is in normal use, the first sealing mechanism and the motion shaft are not sealed, relying on the second sealing mechanism to seal, the rotary motion shaft can rotate freely, the water in the river will not penetrate into the hoisting machine room, and the sealing effect is good.

(4) After the present invention is applied to the steel dam gate, the service life of the steel dam gate is prolonged. The first sealing mechanism adopts copper, copper alloy, aluminum, aluminum alloy, steel, stainless steel, nylon, engineering plastics, modified nylon and other materials that are not easy to age, wear-resistant and have toughness. It is not easy to age when immersed in water, and the sealing effect can be maintained well for a long time; when the steel dam gate is in normal use, the first sealing mechanism is not sealed with the moving shaft, and the sealing device mainly relies on the second sealing mechanism for sealing. The sealing material of the second sealing mechanism is Rubber can play a good waterproof effect without affecting the rotation of the rotary motion shaft, but the rubber material is easy to age. When the sealing material in the second sealing mechanism ages, it can be replaced in time, so the overall life of the steel dam gate is prolonged.

(5) The cost of the rotary motion shaft seal is low. In the present invention, copper, copper alloy, aluminum, aluminum alloy, steel, stainless steel, nylon, engineering plastics, modified nylon and other materials can be added only at the positions of at least three sealing surfaces of the first sealing member, which can effectively reduce costs and achieve Good waterproof effect.

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

(7) The present invention can also be applied to a gas seal in the case of using a moving shaft.

Description of drawings

1 is a schematic diagram of the overall structure of a first embodiment of the present invention;

Fig. 2 is a partial enlarged view of part I in Fig. 1, and is also a schematic structural diagram of Embodiment 1 in state 1;

3 is a partial enlarged view of part II in FIG. 1 , and is also a schematic structural diagram of Embodiment 1 in state 2;

4 is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

Fig. 5 is K-direction view in Fig. 4;

FIG. 6 is a partial enlarged view of part A in FIG. 4 , and is also a schematic structural diagram of the second embodiment in state one;

FIG. 7 is a partial enlarged view of part B in FIG. 4 , and is also a schematic structural diagram of the second embodiment in state two.

Reference number:

The first embodiment: the first sealing member 1, the fixing sleeve 2, the adjusting sleeve 3, the second sealing mechanism 4, the gland 401, the sealing material 402, the first connecting member 5, the second connecting member 6, the adjusting member 7, the adjusting member Tightening member 701, loosening member 702, bolt 8, base 9, moving shaft 10, first sealing surface 11, second sealing surface 12, third sealing surface 13;

Second embodiment: first sealing member 21, fixing sleeve 22, adjusting sleeve 23, second sealing mechanism 24, gland 241, sealing material 242, first connecting member 25, second connecting member 26, adjusting member 27, adjusting member The tightening member 271 , the loosening member 272 , the bolt 28 , the base 29 , the moving shaft 30 , the first sealing surface 31 , the second sealing surface 32 , and the third sealing surface 33 .

Detailed ways

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "closer", "farther away", "sealing medium side", "non-sealing medium side", "one side", etc. are based on the drawings. The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. limit.

In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implying the number of indicated technical features.

In the present invention, unless otherwise expressly specified and limited, terms such as "connection", "sleeve", "provided", "installation", "packaging" and other terms should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachable connection or integrated; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two structures or the interaction of two structures relation. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Below in conjunction with accompanying drawing, technical scheme of the present invention is further described:

In the first embodiment of the present invention, as shown in Figures 1-3, the moving shaft sealing device has a base 9, the moving shaft 10 passes through the base 9, and the base 9 is used to support the moving shaft 10; the movement The shaft sealing device is installed outside the moving shaft 10 for sealing between the moving shaft 10 and the base 9. The moving shaft sealing device includes: a first sealing mechanism and a second sealing mechanism 4; one end of the moving shaft 10 extends into the fluid space , and the other end extends out of the fluid space, forming a sealing medium side and a non-sealing medium side on both 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 non-sealing medium side outside the moving shaft 10, and the second sealing mechanism 4 is detachable;

The moving shaft sealing device further includes a fixing sleeve 2, the fixing sleeve 2 is arranged on the outer periphery of the first sealing mechanism, and the fixing sleeve 2 is sealed with the base 9;

The first sealing mechanism includes 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 is sealed with the base. The seat 9 and the moving shaft 10 are sealed for blocking the outflow of the fluid on the side of the sealing medium.

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

The first sealing member 1 can move. In state 1, at least one third sealing surface 13 is formed between the first sealing member 1 and the fixed sleeve 2, and the fluid on the sealing medium side is blocked by the third sealing surface 13 and the fixed sleeve 2. The second sealing mechanism 4 blocks; in the second state, at least one first sealing surface 11 is formed between the first sealing member 1 and the base 9 , and at least one first sealing surface 11 is formed between the first sealing member 1 and the moving shaft 10 The second sealing surface 12, the fluid on the side of the sealing medium is blocked by the first sealing surface 11 and the second sealing surface 12, further, the moving shaft 10 has a depression, and the shape of the depression is not limited, including stepped, The second sealing surface 12 presents a certain angle with the axial direction of the moving shaft 10 in the shape of a cone surface, a curved surface, etc.

Further, the adjusting sleeve 3 is connected with the first sealing member 1 through a first connecting member 5, or is connected by welding.

Further, the fixing sleeve 2 and the base 9 are connected by a second connecting member 6 or by welding.

Further, the adjustment sleeve 3 is provided with an adjustment member 7, one end of the adjustment member 7 acts on the fixed sleeve 2, and the adjustment member 7 can drive the adjustment sleeve 3 to move in the axial direction, and the adjustment sleeve 3 The first seal 1 can be driven to move.

Further, the adjusting member 7 includes a tightening member 701 and a loosening member 702. The tightening 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 A sealing member 1 moves to the sealing medium side; the loosening member 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 member 1 to move to the non-sealing medium side , or the adjusting sleeve 3 drives the first connecting piece 5 to move to the non-sealing medium side, and the first connecting piece 5 drives the first sealing piece 1 to move to the unsealing medium side.

Adjustment sleeve Further, the moving shaft sealing device further includes bolts 8, the second sealing mechanism 4 includes a gland 401 and a sealing material 402, the gland 401 and the adjustment sleeve 3 are connected by bolts 8, the The sealing material 402 is filled between the adjusting sleeve 3 and the moving shaft 10 , and is pressed by the pressing cover 401 . The sealing material 402 and the adjusting sleeve 3 can be set to be in contact with each other, or can be set to not be in contact with each other. The sealing material 402 may be provided in one or more types.

Further, the motion shaft 10 is a rotary motion shaft or a reciprocating motion shaft. Further, the motion axis is a cylinder.

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

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

In the second embodiment of the present invention, as shown in Figures 4-7, the moving shaft sealing device has a base 29, the moving shaft 30 passes through the base 29, and the base 29 is used to support the moving shaft 30; the movement The shaft sealing device is installed outside the moving shaft 30 for sealing between the moving shaft 30 and the base 29. The moving shaft sealing device includes: a first sealing mechanism and a second sealing mechanism 24; one end of the moving shaft 30 extends into the fluid space , and the other end extends out of the fluid space, forming a sealing medium side and a non-sealing medium side on both 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 non-sealing medium side outside the moving shaft 30, and the second sealing mechanism 24 is detachable;

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

The first sealing mechanism includes 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 the second state, the first sealing member is sealed with the base. The seat 29 and the moving shaft 30 are sealed for blocking the outflow of the fluid on the side of the sealing medium.

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

The first sealing member 21 can move. In state one, at least one third sealing surface 33 is formed between the first sealing member 21 and the fixed sleeve 22, and the fluid on the side of the sealing medium is blocked by the third sealing surface 33 and the fixed sleeve 22. The second sealing mechanism 24 blocks; in the second state, at least one first sealing surface 31 is formed between the first sealing member 21 and the base 29 , and at least one sealing surface 31 is formed between the first sealing member 21 and the moving shaft 30 The second sealing surface 32, the fluid on the side of the sealing medium is blocked by the first sealing surface 31 and the second sealing surface 32, and further, the outer surface of the moving shaft 30 has no concave or convex, the second sealing surface 32 and the movement The axial direction of the shaft 30 is parallel.

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

Further, the fixing sleeve 22 is connected with the base 29 through the second connecting piece 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 in the axial direction, and the adjusting sleeve 23 The first sealing member 21 can be driven to move.

Further, the adjusting member 27 includes a tightening member 271 and a loosening member 272. The tightening member 271 is configured to drive the adjusting sleeve 23 to move toward the sealing medium side, and the adjusting sleeve 23 drives the first A sealing member 21 moves to the sealing medium side, and further, the first sealing member 21 can also move slightly in a direction close to the moving shaft 30; the loosening member 272 is configured to drive the adjusting sleeve 23 to the direction of the moving shaft 30. When the non-sealing medium side moves, the adjusting sleeve 23 drives the first sealing member 21 to move to the non-sealing medium side, or the adjusting sleeve 23 drives the first connecting member 25 to move to the non-sealing medium side, and the first connecting member 25 moves to the non-sealing medium side. The first sealing member 21 is then driven to move toward the non-sealing medium side, and further, the first sealing member 21 may also move slightly in a direction away from the moving shaft 30 .

Further, as shown in FIG. 5 , the tightening member 271 and the loosening member 272 are distributed at intervals.

Further, the moving shaft sealing device further includes bolts 28, the second sealing mechanism 24 includes a gland 241 and a sealing material 242, the gland 241 and the adjusting sleeve 23 are connected by bolts 28, the sealing material 242 is filled between the adjusting sleeve 23 and the moving shaft 30 , and is pressed by the pressing cover 241 . The sealing material 242 and the adjusting sleeve 23 may be arranged to be in contact with each other, and may also be arranged to not be in contact with each other. The sealing material 242 may be provided in one or more types.

Further, the motion shaft 30 is a rotary motion shaft or a reciprocating motion shaft.

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

Further, the motion shaft 30 is a rotary motion shaft or a reciprocating motion shaft. Further, the motion axis is a cylinder.

The third embodiment is a sealing method using the moving shaft sealing device of the present invention, using the moving shaft sealing device of the first embodiment to achieve sealing, including the following steps:

a. Adjust the adjusting member 701, the adjusting sleeve 3 moves toward the sealing medium side, the adjusting sleeve 3 drives the first sealing member 1 to move to the sealing medium side, the first sealing member 1 and the base The seat 9 is extruded to form at least a first sealing surface 11; the first sealing member 1 and the moving shaft 10 are extruded to form at least a second sealing surface 12, when the first sealing surface 11 and the second sealing surface 12 block the sealing medium side After the fluid, stop adjusting the tightening member 701 and fix the position of the tightening member 701;

b. Disassemble the gland 401, take out the original sealing material 402 of the second sealing mechanism 2, and repair or replace the original sealing material 402;

c. Put in the repaired or replaced sealing material, install the gland 401, and compress the sealing material in the second sealing mechanism 2 to achieve sealing;

d. Adjust the loosening member 702, the adjusting sleeve 3 moves to the non-sealing medium side, the adjusting sleeve 3 drives the first sealing member 1 to move to the non-sealing medium side, and the first sealing member 1 At least a third sealing surface 13 is formed by pressing the fixing sleeve 2 .

Further, the gland 401 can be disassembled and installed by means of the bolts 8 .

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

Using the motion shaft sealing device of the second embodiment to achieve sealing, the steps are as follows:

a. Adjust the tightening member 271, the adjusting sleeve 23 moves towards the sealing medium side, the adjusting sleeve 23 drives the first sealing member 21 to move towards the sealing medium side, and further the first sealing member 21 can be slightly Moving in the direction close to the moving shaft 30, the first sealing member 21 presses the base 29 to form at least the first sealing surface 31, and the first sealing member 21 presses the moving shaft 30 to form at least the second sealing surface 32. When the first sealing surface 31 After blocking the fluid on the sealing medium side with the second sealing surface 32, stop adjusting the adjusting member 271 and fix the position of the adjusting member 271;

b. Disassemble the gland 241, take out the original sealing material 242 in the second sealing mechanism 24, and repair or replace the original sealing material;

c. Put in the repaired or replaced sealing material, and install the gland 241 to compress the sealing material in the second sealing mechanism to achieve sealing;

d. Adjust the loosening member 272, the adjusting sleeve 23 moves toward the non-sealing medium side, the adjusting sleeve 23 drives the first sealing member 21 to move to the non-sealing medium side, and further the first sealing member 21 can also Slightly moving away from the moving shaft 30 , the first sealing member 21 presses the fixing sleeve 22 to form at least a third sealing surface 33 .

Further, the gland 241 can be removed and installed through the bolts 28 .

The technical effects of the above embodiments can be extended to the waterproofing of the connection between the ship's drive shaft and the propeller, as well as any water wading engineering that requires waterproofing on the non-sealing medium side of the moving shaft, prolonging the life of the sealing mechanism and facilitating the replacement and maintenance of the sealing material. The invention can also be applied to gas sealing, such as chemical gas sealing.

The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, several improvements and transformations without departing from the principle of the present invention should be regarded as the protection scope of the present 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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