A rotating shaft sealing device and sealing method

Abstract

The application discloses a kind of motion shaft sealing devices, install in motion shaft outside for the sealing between motion shaft and pedestal, comprising: first sealing mechanism, second sealing mechanism, motion shaft forms sealed medium side and non-sealed medium side on both sides of sealing device;First sealing mechanism is wrapped in the sealed medium side outside motion shaft, second sealing mechanism is wrapped in the non-sealed medium side outside motion shaft, second sealing mechanism is detachable;First sealing mechanism includes two states, state one is daily state, first sealing mechanism is not sealed with motion shaft, second sealing mechanism is tightly wrapped motion shaft to realize sealing;State two is replacement state, first sealing mechanism is sealed contact with motion shaft for blocking the fluid of sealed medium side to flow out, second sealing mechanism can be removed and replaced;The application also discloses a sealing method, the sealing property of non-sealed medium side can be guaranteed in normal use state and second sealing mechanism maintenance state, and it is convenient to maintain sealing mechanism, prolong service life.

Description

TECHNICAL FIELD

[0001] The present application relates to a sealing device and a sealing method, in particular to a sealing device and a sealing method for a rotating shaft. BACKGROUND

[0002] In the prior art, the drive shaft of a gate, the drive shaft of a ship, and the output shaft of a pump valve switch all need to work in a medium (such as a liquid or a gas) for a long time. Such a drive shaft is generally referred to as a rotating shaft, and the movement of the rotating shaft includes rotation and reciprocation, which can be referred to as a rotating shaft and a reciprocating shaft, respectively. The rotating shaft is used to drive the opening and closing of a gate or to drive the rotation of a propeller exposed to water by a ship main engine, and thus the rotating shaft has a near-water end (or referred to as a "sealing medium side") and a far-water end (or referred to as a "non-sealing medium side"). The non-sealing medium side is a working environment without fluid, and the sealing medium side is exposed to a fluid, for example, the near-water end is exposed to water. Leak-proof isolation is required between the sealing medium side and the non-sealing medium side.

[0003] Taking a gate as an example, in the prior art, there is a steel dam gate, the structure of which mainly includes a bottom shaft, the bottom shaft is installed on a plurality of hinge seats fixedly arranged on the bottom of a river channel, the bottom shaft penetrates through the walls on both sides of the river channel to extend into a gate hoist room, the gate hoist room is provided with a gate hoist, the bottom shaft is connected to the gate hoist through a crank arm, and a gate leaf for blocking water is welded to the bottom shaft. When the gate hoist works, the bottom shaft can be driven to rotate through the crank arm, so that the gate leaf is erected to block water or laid down to release water. In order to prevent water in the river channel from leaking into the gate hoist room, a sealing device needs to be used to seal between the bottom shaft and the wall. The sealing packing needs to ensure that the rotation of the bottom shaft is not affected by the sealing packing and can realize sealing in the rotating state, and the price and cost are also considered. Therefore, the sealing packing in the sealing device is often made of soft material, such as rubber material. However, the service life of such material is limited. As the use time of the steel dam increases, the sealing performance of the sealing packing decreases, the sealing device starts to leak, water enters the gate hoist room from the penetration of the shaft through the wall, and the normal work of the driving mechanism is affected or even accidents occur.

[0004] The existing sealing device has a complex structure, and does not solve the technical problem of how to replace the aging sealing material under water. Once the steel dam gate is put into use, the bottom shaft is located at the bottom of the river for a long time. It is not practical to pump out the water in the underwater environment when replacing the sealing material. When replacing the sealing material, the water pressure in the river channel is higher than that in the gate hoist room. Once the sealing device is removed, a large amount of water will flow into the gate hoist room, increasing the difficulty of replacement.

[0005] The application provides a simple but effective motion shaft sealing device, and the common sealing filler in the motion shaft sealing device is convenient to replace, thereby providing a good solution for equipment (such as a ship rotating shaft) or engineering (such as a steel dam rotating shaft) requiring a motion shaft. SUMMARY

[0006] The application provides a motion shaft sealing device applied to a motion shaft partially penetrating a medium, and the sealing device is used for sealing the joint position of the motion shaft penetrating the medium and not penetrating the medium, and the sealing material in the sealing device can be replaced.

[0007] The application can be achieved by the following technical scheme: a motion shaft sealing device has a base, a motion shaft penetrates the base, and the base is used for supporting the motion shaft; the motion shaft sealing device is installed outside the motion shaft for sealing between the motion shaft and the base, and the motion shaft sealing device comprises a first sealing mechanism and a second sealing mechanism; at least a part of the motion shaft is outside a fluid space, and a sealing medium side and a non-sealing medium side are formed at positions on both sides of the sealing device;

[0008] The first sealing mechanism is wrapped outside the sealing medium side of the motion shaft, the second sealing mechanism is wrapped outside the non-sealing medium side of the motion shaft, and the second sealing mechanism is detachable;

[0009] The first sealing mechanism comprises at least two states: state one, the first sealing mechanism is arranged not to seal the motion shaft, and the second sealing mechanism tightly wraps the motion shaft to block the flow of fluid on the sealing medium side; and state two, the first sealing mechanism is arranged in sealing contact with the motion shaft to block the flow of fluid on the sealing medium side.

[0010] Further, the motion shaft sealing device further comprises a fixing sleeve, the fixing sleeve is sealed between the base, the first sealing mechanism is movable, in state one, the first sealing mechanism is sealed with the fixing sleeve, and in state two, the first sealing mechanism is sealed with the base and the motion shaft.

[0011] Further, in state one, at least one third sealing surface is formed between the first sealing mechanism and the fixing sleeve, and the fluid on the sealing medium side is blocked by the third sealing surface and the second sealing mechanism; and in state two, 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 motion shaft, and the fluid on the sealing medium side is blocked by the first sealing surface and the second sealing surface.

[0012] Furthermore, the moving shaft sealing device also includes a second connecting member, and the fixed sleeve and the base can be connected by the second connecting member; or the fixed sleeve and the base can be connected by welding; the fixed sleeve and the base of the present invention can also be set as an integral structure, that is, the fixed sleeve can be a part of the base.

[0013] Furthermore, the first sealing mechanism includes a first sealing member and an adjusting sleeve, wherein the adjusting sleeve is connected to the first sealing member and can move axially.

[0014] Furthermore, the moving shaft sealing device also includes a first connecting member, and the first sealing member is connected to the adjusting sleeve via the first connecting member; or the first sealing member is connected to the adjusting sleeve by welding; in the present invention, the first sealing member and the adjusting sleeve can be set as an integrated structure.

[0015] Furthermore, the adjusting sleeve is provided with an adjusting piece, one end of which acts on the fixing sleeve, and the adjusting piece can drive the adjusting sleeve to move axially, and the adjusting sleeve can drive the first sealing piece to move.

[0016] Furthermore, 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 move toward the sealing medium side; the loosening member is configured to drive the adjusting sleeve to move toward the non-sealing medium side, and the adjusting sleeve drives the first sealing member to move toward the non-sealing medium side.

[0017] Furthermore, the moving shaft sealing device further includes bolts, and the second sealing mechanism includes a gland and a sealing material. The gland is connected to the adjustment sleeve via bolts, and the sealing material is filled between the adjustment sleeve and the moving shaft and compressed by the gland. In the present invention, the sealing material and the adjustment sleeve can be arranged to be in contact or non-contact.

[0018] Furthermore, the motion axis is a rotational motion axis or a reciprocating motion axis. In the present invention, the rotational motion axis is a cylinder, with the center line of the cylinder as the axis, and the rotational motion axis rotates around the axis; in the present invention, the reciprocating motion axis is a cylinder, and the reciprocating motion axis moves in a direction parallel to the axial direction of the cylinder.

[0019] Furthermore, the material of the first sealing member is one or more of copper, copper alloy, aluminum, aluminum alloy, steel, stainless steel, nylon, engineering plastics, and modified nylon.

[0020] Furthermore, the sealing material is one or more of an O-ring, a lip-shaped sealing ring, a square sealing ring, a water-swellable rubber, a V-shaped combined sealing ring or a packing.

[0021] The application also discloses a sealing method, comprising the following steps:

[0022] a. adjusting the tightening member, moving the first sealing mechanism to the sealing medium side, extruding the base to form at least one first sealing surface, and extruding the motion shaft to form at least one second sealing surface;

[0023] b. disassembling the pressure cover, taking out the original sealing material in the second sealing mechanism, and repairing or replacing the original sealing material;

[0024] c. putting in the repaired or replaced sealing material, installing the pressure cover, and extruding the sealing material in the second sealing mechanism to realize sealing;

[0025] d. adjusting the loosening member, moving the first sealing mechanism to the non-sealing medium side, and extruding the fixed sleeve to form at least one third sealing surface.

[0026] In addition, according to the use and installation mode of different motion shafts, the motion shaft can be arranged with one end in the fluid space and the other end outside the fluid space, such as the application of the bottom shaft of a steel dam gate, the bottom shaft is arranged as a rotating motion shaft with one end in the water body and the other end in the hoist chamber; the motion shaft can also be arranged with one end outside the fluid space and the other end flush with the water interface of the base; or the motion shaft can be arranged with a middle part outside the fluid space and both ends extending into the fluid space through the base, such as the land driving shaft of an amphibious vehicle, the land driving shaft drives the wheels to move on land, the middle part of the driving shaft is in the waterless space of the vehicle body, and both ends of the driving shaft extend out of the vehicle body and are in the water when the vehicle moves in the water.

[0027] The application can not only be applied to the sealing of the rotating motion shaft of a steel dam gate, but also be applied to the sealing of the connection between the driving shaft and the propeller of a ship and the sealing of other water-related projects, the fluid of the application also includes food and chemical raw materials, and the application can also be applied to the sealing of gas.

[0028] The application has the following beneficial effects:

[0029] (1) The sealing material in the second sealing mechanism can be conveniently replaced, the fluid on the sealing medium side is blocked by the first sealing mechanism, and cannot enter the position of the second sealing mechanism, thereby reducing the maintenance difficulty of the second sealing mechanism.

[0030] (2) The application can be applied to a steel dam gate, and the waterproof effect in the hoist chamber can be ensured during maintenance, the water in the river channel cannot enter the hoist chamber when the sealing material in the second sealing mechanism is replaced, the mechanism in the hoist chamber can be well protected, and the safety and replacement efficiency of the hoist chamber are ensured.

[0031] (3) Under normal conditions, the rotating shaft can rotate freely and the opening and closing machine room has a good waterproof effect. When the rotating shaft is in normal use, the first sealing mechanism and the shaft are not sealed. The second sealing mechanism is used for sealing. The rotating shaft can rotate freely and the water in the river will not penetrate into the opening and closing machine room. The sealing effect is good.

[0032] (4) After the present invention is applied to the steel dam gate, the service life of the steel dam gate is extended. 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 tough, and achieves sealing by extrusion. At the same time, these materials are not easy to age even if they are immersed in water for a long time, and the sealing effect can be maintained for a long time. When the steel dam gate is in normal use, the first sealing mechanism and the moving shaft are not sealed. The sealing device mainly relies on the second sealing mechanism for sealing. The sealing material of the second sealing mechanism is rubber, which can play a good waterproof effect and does not affect the rotation of the rotating moving shaft. However, 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 service life of the steel dam gate is extended.

[0033] (5) The rotary shaft seal has low cost. The present invention can simply add copper, copper alloy, aluminum, aluminum alloy, steel, stainless steel, nylon, engineering plastics, modified nylon, or other materials to at least three sealing surfaces of the first seal, effectively reducing costs and achieving a good waterproof effect.

[0034] (6) The present invention can be applied to the sealing of various liquids in scenarios using moving shafts, such as the sealing of food and chemical raw materials.

[0035] (7) The present invention can also be applied to gas sealing in the case of using a moving shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall structure of a first embodiment of the present invention;

[0037] Figure 2 for Figure 1 The partially enlarged view of part I is also a schematic structural diagram of embodiment 1 in state 1;

[0038] Figure 3 for Figure 1 The partial enlarged view of part II is also a schematic structural diagram of embodiment 1 in state 2;

[0039] Figure 4 This is a schematic diagram of the overall structure of the second embodiment of the present invention;

[0040] Figure 5 for Figure 4 Middle K-direction view;

[0041] Figure 6for Figure 4 The partially enlarged view of part A is also a schematic diagram of the structure of embodiment 2 in state 1;

[0042] Figure 7 for Figure 4 The partially enlarged view of part B is also a structural schematic diagram of embodiment 2 in state 2.

[0043] Reference numerals:

[0044] First embodiment: first sealing member 1, fixing sleeve 2, adjusting sleeve 3, second sealing mechanism 4, gland 401, sealing material 402, first connecting member 5, second connecting member 6, adjusting member 7, 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;

[0045] Second embodiment: first sealing member 21, fixing sleeve 22, adjusting sleeve 23, second sealing mechanism 24, pressure cover 241, sealing material 242, first connecting member 25, second connecting member 26, adjusting member 27, tightening member 271, loosening member 272, bolt 28, base 29, moving shaft 30, first sealing surface 31, second sealing surface 32, third sealing surface 33. DETAILED DESCRIPTION

[0046] In the description of the present invention, it should be understood that the terms "close to", "far away from", "sealed medium side", "non-sealed medium side", "one side", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0048] In the present invention, unless otherwise expressly specified or limited, terms such as "connect," "housing," "provided with," "installed," and "wrapped" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and may include internal communication between two structures or interaction between two structures. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] The technical solution of the present invention is further described below with reference to the accompanying drawings:

[0050] The first embodiment of the present application is shown in Figures 1-3 The shaft seal device is installed outside the shaft 10 for sealing between the shaft 10 and the base 9, and comprises a first sealing mechanism, a second sealing mechanism 4; the shaft 10 extends into the fluid space at one end and extends out of the fluid space at the other end, forming a sealing medium side and a non-sealing medium side on both sides of the sealing device;

[0051] The first sealing mechanism is wrapped on the sealing medium side of the shaft 10, and the second sealing mechanism 4 is wrapped on the non-sealing medium side of the shaft 10, and the second sealing mechanism 4 is detachable;

[0052] The shaft seal device further comprises a fixing sleeve 2 arranged on the outer periphery of the first sealing mechanism, and the fixing sleeve 2 is sealed between the base 9;

[0053] The first sealing mechanism comprises at least two states: in state one, the first sealing mechanism is sealed with the fixing sleeve 2, and the first sealing mechanism is not sealed with the shaft 10; in state two, the first sealing mechanism is sealed with the base 9 and the shaft 10, and is used to block the flow of fluid on the sealing medium side.

[0054] Further, the first sealing mechanism comprises a first sealing element 1 and an adjusting sleeve 3, and the adjusting sleeve 3 can move axially;

[0055] The first sealing element 1 can move, and in state one, the first sealing element 1 is sealed between the fixing sleeve 2 to form at least one third sealing surface 13, and the fluid on the sealing medium side is blocked by the third sealing surface 13 and the second sealing mechanism 4; in state two, the first sealing element 1 forms at least one first sealing surface 11 with the base 9, and forms at least one second sealing surface 12 with the shaft 10, and the fluid on the sealing medium side is blocked by the first sealing surface 11 and the second sealing surface 12, further, the shaft 10 has a recess, the shape of the recess is not limited, including stepped, conical, curved, etc., and the second sealing surface 12 presents a certain angle with the axial direction of the shaft 10.

[0056] Further, the adjusting sleeve 3 is connected with the first sealing element 1 through a first connecting element 5, or is connected by welding.

[0057] Further, the fixing sleeve 2 is connected with the base 9 through a second connecting element 6, or is connected by welding.

[0058] Further, the adjusting sleeve 3 is provided with an adjusting member 7, one end of the adjusting member 7 acts on the fixed sleeve 2, the adjusting member 7 can drive the adjusting sleeve 3 to move in the axial direction, and the adjusting sleeve 3 can drive the first sealing member 1 to move.

[0059] Further, the adjusting member 7 comprises a tightening member 701 and a loosening member 702, the tightening member 701 is configured to drive the adjusting sleeve 3 to move to the sealing medium side, and the adjusting sleeve 3 drives the first sealing member 1 to move 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 member 5 to move to the non-sealing medium side, and the first connecting member 5 drives the first sealing member 1 to move to the non-sealing medium side.

[0060] Further, the motion shaft sealing device 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 motion shaft 10 and is compressed by the gland 401. The sealing material 402 can be in contact with the adjusting sleeve 3 or not. The sealing material 402 can be one or more.

[0061] Further, the motion shaft 10 is a rotary motion shaft or a reciprocating motion shaft. Further, the motion shaft is a cylinder.

[0062] 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 plastic and modified nylon.

[0063] Further, the sealing material 402 is one or more of a 0-shaped sealing ring, a lip-shaped sealing ring, a square sealing ring, water-swelling rubber, a V-shaped combined sealing ring or a packing.

[0064] The second embodiment of the present application is shown in Figures 4-7 The motion shaft sealing device has a base 29, a motion shaft 30 passes through the base 29, and the base 29 is used for supporting the motion shaft 30; the motion shaft sealing device is installed outside the motion shaft 30 for sealing between the motion shaft 30 and the base 29, and the motion shaft sealing device comprises a first sealing mechanism and a second sealing mechanism 24; one end of the motion shaft 30 extends into a fluid space, the other end extends out of the fluid space, and the positions on both sides of the sealing device form a sealing medium side and a non-sealing medium side;

[0065] The first sealing mechanism is wrapped outside the moving shaft 30 on the sealed medium side, the second sealing mechanism 24 is wrapped outside the moving shaft 30 on the non-sealed medium side, and the second sealing mechanism 24 is detachable;

[0066] The moving shaft sealing device further comprises a fixing sleeve 22 arranged on the outer periphery of the first sealing mechanism, and the fixing sleeve 22 is sealed between the base 29;

[0067] The first sealing mechanism comprises at least two states: in state one, the first sealing mechanism is sealed with the fixing sleeve 22, and the first sealing mechanism is not sealed with the moving shaft 30; in state two, the first sealing mechanism is sealed with the base 29 and the moving shaft 30, and is used for blocking the fluid on the sealed medium side from flowing out.

[0068] Further, the first sealing mechanism comprises a first sealing element 21 and an adjusting sleeve 23, and the adjusting sleeve 23 can move axially;

[0069] The first sealing element 21 can move, in state one, the first sealing element 21 is sealed between the fixing sleeve 22 to form at least one third sealing surface 33, and the fluid on the sealed medium side is blocked by the third sealing surface 33 and the second sealing mechanism 24; in state two, the first sealing element 21 is sealed between the base 29 to form at least one first sealing surface 31, and the first sealing element 21 is sealed between the moving shaft 30 to form at least one second sealing surface 32, and the fluid on the sealed 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 concave or convex, and the second sealing surface 32 is axially parallel to the moving shaft 30.

[0070] Further, the adjusting sleeve 23 is connected with the first sealing element 21 through a first connecting element 25, or is connected by welding.

[0071] Further, the fixing sleeve 22 is connected with the base 29 through a second connecting element 26, or is connected by welding.

[0072] Further, the adjusting sleeve 23 is provided with an adjusting element 27, one end of the adjusting element 27 acts on the fixing sleeve 22, the adjusting element 27 can drive the adjusting sleeve 23 to move axially, and the adjusting sleeve 23 can drive the first sealing element 21 to move.

[0073] Further, the adjusting member 27 comprises a tightening member 271 and a loosening member 272. The tightening member 271 is configured to drive the adjusting sleeve 23 to move towards the sealed medium side, and the adjusting sleeve 23 drives the first sealing member 21 to move towards the sealed medium side, and further, the first sealing member 21 can slightly move towards the direction of the moving shaft 30. The loosening member 272 is configured to drive the adjusting sleeve 23 to move towards the non-sealed medium side, and the adjusting sleeve 23 drives the first sealing member 21 to move towards the non-sealed medium side, or the adjusting sleeve 23 drives the first connecting member 25 to move towards the non-sealed medium side, and the first connecting member 25 drives the first sealing member 21 to move towards the non-sealed medium side, and further, the first sealing member 21 can slightly move away from the direction of the moving shaft 30.

[0074] Further, as shown in Figure 5 The tightening member 271 and the loosening member 272 are spaced apart.

[0075] Further, the moving shaft sealing device further comprises a bolt 28, the second sealing mechanism 24 comprises 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 can be in contact with the adjusting sleeve 23 or not. The sealing material 242 can be one or more.

[0076] Further, the moving shaft 30 is a rotating moving shaft or a reciprocating moving shaft.

[0077] The materials of the first sealing member 21 and the sealing material 242 in the second embodiment can adopt the materials in the first embodiment.

[0078] Further, the moving shaft 30 is a rotating moving shaft or a reciprocating moving shaft. Further, the moving shaft is a cylinder.

[0079] The third embodiment is a sealing method using the moving shaft sealing device of the present application, and the sealing is achieved by using the moving shaft sealing device of the first embodiment, which comprises the following steps:

[0080] a. Adjust the tightening member 701, and the adjusting sleeve 3 moves towards the sealed medium side, and the adjusting sleeve 3 drives the first sealing member 1 to move towards the sealed medium side, and the first sealing member 1 is pressed against the base 9 to form at least a first sealing surface 11; and the first sealing member 1 is pressed against the moving shaft 10 to form at least a second sealing surface 12, when the first sealing surface 11 and the second sealing surface 12 block the fluid on the sealed medium side, stop adjusting the tightening member 701 and fix the position of the tightening member 701;

[0081] b. dismounting the gland 401, taking out the original sealing material 402 of the second sealing mechanism 2, repairing or replacing the original sealing material 402;

[0082] c. putting in the repaired or replaced sealing material, installing the gland 401, and pressing the sealing material in the second sealing mechanism 2 to realize sealing;

[0083] d. adjusting the loosening member 702, moving the adjusting sleeve 3 to the non-sealing medium side, moving the first sealing member 1 to the non-sealing medium side by the adjusting sleeve 3, and extruding the stationary sleeve 2 by the first sealing member 1 to form at least a third sealing surface 13.

[0084] Further, the gland 401 can be dismounted and installed by the bolt 8.

[0085] When adjusting the adjusting sleeve 3, the first sealing member 1 can be directly moved by the adjusting sleeve 3, or the first sealing member 1 can be moved by the first connecting member 5 driven by the adjusting sleeve 3; when adjusting the tightening member 701, the first sealing member 1 finally reaches state two, and sealing is realized by the first sealing surface 11 and the second sealing surface 12; when adjusting the loosening member 702, the first sealing mechanism finally reaches state one, and sealing is realized by the third sealing surface 13 and the sealing material 402 of the second sealing mechanism.

[0086] The motion shaft sealing device of the second embodiment is used to realize sealing, including the following steps:

[0087] a. adjusting the tightening member 271, moving the adjusting sleeve 23 to the sealing medium side, moving the first sealing member 21 to the sealing medium side by the adjusting sleeve 23, further moving the first sealing member 21 slightly to the direction of the motion shaft 30, extruding the base 29 by the first sealing member 21 to form at least a first sealing surface 31, extruding the motion shaft 30 by the first sealing member 21 to form at least a second sealing surface 32, stopping adjusting the tightening member 271 and fixing the position of the tightening member 271 when the first sealing surface 31 and the second sealing surface 32 block the fluid on the sealing medium side;

[0088] b. dismounting the gland 241, taking out the original sealing material 242 of the second sealing mechanism 24, repairing or replacing the original sealing material;

[0089] c. putting in the repaired or replaced sealing material, installing the gland 241, and pressing the sealing material in the second sealing mechanism to realize sealing;

[0090] d.Adjusting the adjusting sleeve 272, the adjusting sleeve 23 moves to the non-sealing medium side direction, the adjusting sleeve 23 drives the first sealing member 21 to move to the non-sealing medium side direction, and the first sealing member 21 can further slightly move to the direction away from the motion shaft 30, and the first sealing member 21 extrudes the fixed sleeve 22 to form at least the third sealing surface 33.

[0091] Further, the gland 241 can be disassembled and assembled through the bolt 28.

[0092] The technical effect of the above embodiment can be popularized to the water-proofing of the connection between the ship driving shaft and the propeller, and any water-related engineering on the non-sealing medium side of the motion shaft, prolongs the service life of the sealing mechanism, and facilitates the replacement and maintenance of the sealing material. The application can also be popularized and applied to the sealing of gas, such as the sealing of chemical gas.

[0093] The above is only the preferred embodiment of the application, and the protection scope of the application is not limited to the embodiment. Any technical solution that belongs to the idea of the application is within the protection scope of the application. It should be noted that, for ordinary skilled persons in the technical field, some improvements and changes without departing from the principle of the application should be considered as the protection scope of the application.

Claims

1. A moving shaft sealing device, comprising a base, through which a moving shaft passes, and the base is used to support the moving shaft; the moving shaft sealing device is installed outside the moving shaft for sealing between the moving shaft and the base, characterized in that: The moving shaft sealing device comprises: a first sealing mechanism and a second sealing mechanism; at least a portion of the moving shaft is outside the fluid space, and a sealing medium side and a non-sealing medium side are formed on both sides of the sealing device; The first sealing mechanism is wrapped around the sealing medium side of the outer side of the moving shaft, and the second sealing mechanism is wrapped around the non-sealing medium side of the outer side of the moving shaft, and the second sealing mechanism is detachable; The first sealing mechanism includes at least two states: in state one, the first sealing mechanism and the moving shaft are set to be not sealed, and the second sealing mechanism tightly wraps the moving shaft to prevent the fluid from flowing out of the sealing medium side; in state two, the first sealing mechanism and the moving shaft are set to be in sealing contact to prevent the fluid from flowing out of the sealing medium side; The moving shaft sealing device further comprises a fixed sleeve, which is sealed with the base; the first sealing mechanism is movable, and in state one, 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; In state one, at least one third sealing surface is formed between the first sealing mechanism and the fixed sleeve, and the fluid on the sealing medium side is blocked by the third sealing surface and the second sealing mechanism; in state two, 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 sealing medium side is blocked by the first sealing surface and the second sealing surface.

2. The moving shaft sealing device according to claim 1, characterized in that: The moving shaft sealing device further includes a second connecting member, and the fixing sleeve and the base are connected via the second connecting member; or the fixing sleeve and the base are connected by welding.

3. The moving shaft sealing device according to claim 1, characterized in that: The first sealing mechanism includes a first sealing member and an adjusting sleeve. The adjusting sleeve is connected to the first sealing member and can move axially.

4. The moving shaft sealing device according to claim 3, characterized in that: The moving shaft sealing device further includes a first connecting member, and the first sealing member is connected to the adjusting sleeve via the first connecting member; or the first sealing member is connected to the adjusting sleeve by welding.

5. The moving shaft sealing device according to claim 3, characterized in that: The adjusting sleeve is provided with an adjusting piece, one end of which acts on the fixing sleeve. The adjusting piece can drive the adjusting sleeve to move axially, and the adjusting sleeve can drive the first sealing piece to move.

6. The moving shaft sealing device according to claim 5, characterized in that: 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 move toward the sealing medium side; the loosening member is configured to drive the adjusting sleeve to move toward the non-sealing medium side, and the adjusting sleeve drives the first sealing member to move toward the non-sealing medium side.

7. The moving shaft sealing device according to claim 3, characterized in that: The moving shaft sealing device also includes bolts, and the second sealing mechanism includes a pressure cover and a sealing material. The pressure cover is connected to the adjustment sleeve by bolts, and the sealing material is filled between the adjustment sleeve and the moving shaft and is compressed by the pressure cover.

8. The moving shaft sealing device according to any one of claims 1 to 7, characterized in that: The motion axis is a rotational motion axis or a reciprocating motion axis.

9. The moving shaft sealing device according to any one of claims 3 to 7, characterized in that: The material of the first sealing member is one or more of copper, copper alloy, aluminum, aluminum alloy, steel, and engineering plastics.

10. The moving shaft sealing device according to claim 7, characterized in that: The sealing material is one or more of an O-shaped sealing ring, a lip sealing ring, a square sealing ring, a water-swelling rubber, and a V-shaped combined sealing ring.

11. A sealing method, characterized in that: Using the moving shaft sealing device according to any one of claims 1 to 10, comprising the following steps: a. Adjust the tightening member, the first sealing mechanism moves toward the sealing medium side, the first sealing mechanism squeezes the base to form at least one first sealing surface, and the first sealing mechanism squeezes the moving shaft to form at least one second sealing surface; b. Remove the gland, remove the original sealing material in the second sealing mechanism, and repair or replace the original sealing material; c. Place 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, and the first sealing mechanism moves toward the non-sealed medium side; the first sealing mechanism squeezes the fixed sleeve to form at least one third sealing surface.

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