A multi-stage combined compensation type rotary shaft sealing device

Abstract

The utility model relates to mechanical field especially relates to a multistage combined compensation formula rotary shaft sealing device. The axle and the axle sleeve pass through the container wall (13), the axle and the axle sleeve are combined together and can rotate together, the axle sleeve outside the container wall (13) is arranged with the wedge-shaped sealing bin of first stage, the soft packing sealing bin of second stage, the nitrogen sealing bin of third stage, the single end face mechanical seal of fourth stage from the container wall outward in proper order, the first wedge-shaped sealing adopts the wedge-shaped sealing ring and the pressing ring, and the material of both is nonmetal material, and the sealing surface is the inclined plane, and the structure of inclined plane increases the contact area, and delays the wear and tear in the stress process, the die spring is set up in the right angle edge of wedge-shaped sealing ring and sealing gland middle, the die spring is in compression state when the sealing device is used first time, along with the wear and tear of wedge-shaped sealing ring and pressing ring, the die spring gradually lengthens, effectively guarantees the contact of wedge-shaped sealing ring and pressing ring sealing surface, prolongs the service life of nonmetal sealing element.

Description

Technical Field

[0001] This utility model relates to the field of machinery, and in particular to a multi-stage combined compensation rotary shaft sealing device. Background Technology

[0002] In the complex field of industrial machinery, shaft end seals, as a key basic component, are often overlooked but always play an indispensable role. Whether in dryers, dry mixers, or vacuum drums, shaft end seals are essential for ensuring their long-term stable operation and directly affect the sealing performance, energy consumption, and service life of the entire machine.

[0003] However, under current technological conditions, many seals still face a series of problems that urgently need to be solved. Common issues include excessively rapid wear of the sealing material, leading to damage to the shaft end surface, which in turn causes media leakage and energy waste. This necessitates frequent equipment downtime for maintenance, increasing operating costs and potentially causing contamination of materials and affecting product quality, or even triggering equipment failure, due to impurities entering the system. Therefore, the industry urgently needs to develop new shaft end sealing solutions that are more wear-resistant, more reliable, and better suited to extreme operating conditions. Utility Model Content

[0004] The purpose of this utility model is to provide a multi-stage combined compensation rotary shaft sealing device with better performance. The specific purpose is explained in the specific implementation section for several substantial technical effects.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A multi-stage combined compensation rotary shaft sealing device, characterized in that the shaft and the bushing pass through the container wall 13; the shaft and the bushing are joined together by a pin and can rotate together; On the bushing outside the container wall 13, from the container wall outwards, there are arranged the first-stage wedge-shaped sealing chamber, the second-stage soft packing sealing chamber, the third-stage nitrogen sealing chamber, and the fourth-stage single-end mechanical seal. The first-level wedge-shaped sealing chamber 4 is composed of an end plate 401, a wedge-shaped sealing ring 402, a pressure ring 403, a sealing cover 404, a mold spring 405, and a countersunk screw 406. The end plate 401 has a hole for the shaft and bushing to pass through, and also includes an annular hole for receiving a wedge-shaped sealing ring 402. The wedge-shaped sealing ring 402 has a beveled cross section, and the wedge-shaped sealing ring 402 can be pressed against the beveled surface by an annular pressure ring 403. A mold spring 405 is arranged outside the pressure ring 403 to press the wedge-shaped sealing ring 402 and the pressure ring 403. The mold spring 405 is pressed by a sealing cover 404. A threaded hole is provided on the end plate 401 for installing the soft packing sealing chamber 5; The secondary soft packing sealing chamber 5 consists of an end plate mounting flange 501, a C-type sealing ring 502, a snap ring 503, soft packing 504, a soft packing injection hole 505, a soft packing gland 506, a nitrogen sealing chamber mounting flange 507, and an inspection port 508. The inspection port 508 is provided on both sides of the soft packing gland 506 to facilitate the removal of residue after soft packing wear. The end plate mounting flange 501 is fixed to the wedge-shaped sealing chamber 4 by bolts. The end plate mounting flange 501 includes an inner hole for installing the C-type sealing ring 502. The C-type sealing ring 502 is squeezed by the snap ring 503. The soft packing gland 506 is squeezed between the end plate mounting flange 501 and the nitrogen sealing chamber mounting flange 507. The soft packing gland 506 is filled with soft packing 504. A structure for containing nitrogen is arranged between two nitrogen sealing chamber mounting flanges 507 in a three-stage nitrogen sealing chamber 2. The single-end mechanical seal 1 consists of a stationary ring 102, a rotating ring 103, and a compression spring 104. The stationary ring 102 is the static sealing component of the mechanical seal; the rotating ring 103 is the dynamic sealing component of the mechanical seal. The rotating ring 103 adjusts the gap with the stationary ring by axial movement, thereby achieving a sealing effect; the compression spring 104 compresses the rotating ring 103 from one side, and the rotating ring 103 compresses the stationary ring 102.

[0006] A further technical solution of this utility model is that there should be a tolerance fit between the bushing and the shaft, and 2-3 O-rings 6 are provided between the bushing and the shaft for sealing, and a bushing gasket 7 is provided at the end of the bushing to further enhance the sealing effect.

[0007] A further technical solution of this utility model is that an anti-rotation key 10 is provided between the bushing and the shaft, and three anti-rotation keys are provided to further fix the bushing and prevent the bushing 3 from rotating in the circumferential direction; the three anti-rotation keys are evenly distributed in the circumferential direction, and a round nut 11 and a stop washer 12 are provided at the end of the bushing 3. The round nut 11 and the stop washer 12 are used to fix the bushing, and the end of the round nut is tightly fitted with the bushing 3 to prevent the bushing 3 from moving axially.

[0008] A further technical solution of this utility model is that the single-end mechanical seal 1 is connected to the nitrogen sealing chamber 2, the nitrogen sealing chamber 2 is connected to the soft packing sealing chamber 5, and the soft packing sealing chamber 5 is connected to the wedge-shaped sealing chamber 4 by flanges. The connecting parts are bolts. All flanges are sealed with tongue and groove surfaces. The tongue and groove surfaces and the groove surfaces cooperate with each other. The sealing gasket 8 is placed in the groove to ensure good sealing between each level of seal.

[0009] The present invention, employing the above technical solution, has the following beneficial effects compared to the prior art: 1. This multi-stage combined compensation rotary shaft sealing device uses a multi-stage combined sealing system of mechanical seal, soft packing seal, wedge seal, and nitrogen seal, combining mechanical seal and packing seal for use. The advantages of mechanical seals are: low manufacturing cost, relatively convenient maintenance, wide range of mechanical seal selection for various industries, mature technology, and easy procurement of parts. The disadvantages are: complex production, high processing requirements, relatively troublesome installation and replacement, requiring workers to have a certain level of technical skill, and difficulty in handling accidental accidents. The advantages and disadvantages of packing seals are: simple structure, easy replacement, low cost, wide applicability, and can be used for sealing rotary, reciprocating, and helical motions, allowing axial movement of the rotating shaft. Its disadvantages are: slightly poor sealing performance, no large radial runout of the shaft, high power consumption, shaft wear, and short service life. Combining the two types of seals extends the overall service life of the sealing device.

[0010] 2. This multi-stage combined compensation rotary shaft sealing device uses a wedge-shaped sealing ring and a pressure ring as the first stage wedge seal. Both are made of non-metallic materials, and the sealing surface, i.e., the contact surface, is an inclined surface. The inclined surface structure increases the contact area and delays wear during the stress process. A mold spring can be set between the right-angle side of the wedge-shaped sealing ring and the sealing cover. 6-8 springs can be evenly set. When the sealing device is first used, the mold spring is in a compressed state. As the wedge-shaped sealing ring and the pressure ring wear, the mold spring gradually elongates, effectively ensuring good contact between the sealing surfaces of the wedge-shaped sealing ring and the pressure ring, and extending the service life of the non-metallic seal.

[0011] 3. This type of multi-stage combined compensation rotary shaft sealing device uses soft packing for sealing. The soft packing fills the entire sealing chamber, achieving a sealing effect. Two to three soft packing injection holes can be set to facilitate quick and uniform injection of soft packing. To inject soft packing, simply open the injection hole and plug it to inject, avoiding the hassle of disassembling bolts and the sealing device.

[0012] In summary, this multi-stage combined compensation rotary shaft sealing device has advantages such as long service life, reliable sealing, simple maintenance, and convenient repair, overcoming the limitations of existing sealing devices in use. Attached Figure Description

[0013] To further illustrate this utility model, the following description is provided in conjunction with the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the primary wedge-shaped sealing chamber of this utility model; Figure 3 This is a schematic diagram of the two-stage soft packing sealing chamber structure of this utility model; Figure 4 This is a partial structural schematic diagram of the present invention; In the diagram: 1. Single-end mechanical seal; 2. Nitrogen sealing chamber; 3. Bushing; 4. Wedge-shaped sealing chamber; 401. End plate; 402. Wedge-shaped sealing ring; 403. Pressure ring; 404. Sealing gland; 405. Mold spring; 406. Countersunk screw; 5. Soft packing sealing chamber; 501. End plate mounting flange; 502. C-type sealing ring; 503. Snap ring; 504. Soft packing; 505. Soft packing injection hole; 506. Soft packing gland; 507. Nitrogen sealing chamber mounting flange; 508. Inspection port; 6. O-ring; 7. Bushing gasket; 8. Sealing gasket; 9. Fastener; 10. Anti-rotation key; 11. Round nut; 12. Locking washer; 13. Container wall; 101. Single-end flange; 102. Stationary ring; 103. Rotary ring; 104. Compression spring. Detailed Implementation

[0014] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0015] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0016] This patent provides multiple parallel solutions; the different descriptions represent improved or parallel solutions based on a basic solution. Each solution has its own unique characteristics. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. Fixing methods not described herein can be any type of fixing, such as threaded fixing, bolt fixing, or adhesive bonding.

[0017] A multi-stage combined compensation rotary shaft sealing device, characterized in that the shaft and the bushing pass through the container wall 13; the shaft and the bushing are joined together by a pin and can rotate together; On the bushing outside the container wall 13, from the container wall outwards, there are arranged the first-stage wedge-shaped sealing chamber, the second-stage soft packing sealing chamber, the third-stage nitrogen sealing chamber, and the fourth-stage single-end mechanical seal. The first-level wedge-shaped sealing chamber 4 is composed of an end plate 401, a wedge-shaped sealing ring 402, a pressure ring 403, a sealing cover 404, a mold spring 405, and a countersunk screw 406. The end plate 401 has a hole for the shaft and bushing to pass through, and also includes an annular hole for receiving a wedge-shaped sealing ring 402. The wedge-shaped sealing ring 402 has a beveled cross section, and the wedge-shaped sealing ring 402 can be pressed against the beveled surface by an annular pressure ring 403. A mold spring 405 is arranged outside the pressure ring 403 to press the wedge-shaped sealing ring 402 and the pressure ring 403. The mold spring 405 is pressed by a sealing cover 404. A threaded hole is provided on the end plate 401 for installing the soft packing sealing chamber 5; The secondary soft packing sealing chamber 5 consists of an end plate mounting flange 501, a C-type sealing ring 502, a snap ring 503, soft packing 504, a soft packing injection hole 505, a soft packing gland 506, a nitrogen sealing chamber mounting flange 507, and an inspection port 508. The inspection port 508 is provided on both sides of the soft packing gland 506 to facilitate the removal of residue after soft packing wear. The end plate mounting flange 501 is fixed to the wedge-shaped sealing chamber 4 by bolts. The end plate mounting flange 501 includes an inner hole for installing the C-type sealing ring 502. The C-type sealing ring 502 is squeezed by the snap ring 503. The soft packing gland 506 is squeezed between the end plate mounting flange 501 and the nitrogen sealing chamber mounting flange 507. The soft packing gland 506 is filled with soft packing 504. A structure for containing nitrogen is arranged between two nitrogen sealing chamber mounting flanges 507 in a three-stage nitrogen sealing chamber 2. The single-end mechanical seal 1 consists of a stationary ring 102, a rotating ring 103, and a compression spring 104. The stationary ring 102 is the static sealing component of the mechanical seal; the rotating ring 103 is the dynamic sealing component of the mechanical seal. The rotating ring 103 adjusts the gap with the stationary ring through axial movement, thereby achieving a sealing effect. The compression spring 104 compresses the rotating ring 103 from one side, and the rotating ring 103 compresses the stationary ring 102. The substantial technical effect and its implementation process, i.e., the basic function and non-obvious aspects, are as follows: A multi-stage combined compensation rotary shaft sealing device mainly consists of a first-stage wedge-shaped sealing chamber, a second-stage soft packing seal, a third-stage nitrogen sealing chamber, a fourth-stage single-end mechanical seal, a shaft sleeve, and an O-ring, etc., characterized in that: the sealing device includes a wedge-shaped sealing chamber, a soft packing sealing chamber, a nitrogen sealing chamber, a single-end mechanical seal, a shaft sleeve, an O-ring, a shaft sleeve gasket, a sealing gasket, fasteners, an anti-rotation key, a round nut, and a stop washer, etc.

[0018] Preferably, the concentricity between the sealing device body and the non-metallic sealing ring and the center of the rotating shaft equipment shall not exceed 0.04 mm, and the perpendicularity between the sealing end face of the sealing device body and the center of the rotating shaft equipment shall not exceed 0.04 mm.

[0019] Preferably, the primary wedge-shaped sealing chamber is composed of an end plate, a wedge-shaped sealing ring, a pressure ring, a sealing gland, a mold spring, and countersunk screws. The end plate has threaded holes to facilitate the installation of the soft packing sealing chamber. The contact surfaces of the wedge-shaped sealing ring and the pressure ring are inclined and can be made of different non-metallic materials to ensure good contact between the sealing surfaces. The mold spring is pressed between the sealing gland and the non-metallic sealing components, so that the wedge-shaped sealing ring and the pressure ring maintain tight contact between the sealing surfaces even under wear conditions, thus extending the service life of the non-metallic sealing components.

[0020] Preferably, the flanges of the secondary soft packing sealing chamber and the tertiary nitrogen sealing chamber are equipped with C-type sealing rings and retaining rings. The C-type sealing rings can ensure the tightness between the various levels of sealing at the shaft end, and the retaining rings are used to further position the C-type sealing rings and prevent axial movement of the C-type sealing rings due to wear during use.

[0021] Preferably, the secondary soft packing seal includes an end plate mounting flange, a C-type sealing ring, a snap ring, soft packing, soft packing injection holes, a soft packing gland, a nitrogen sealing chamber mounting flange, and an inspection port, etc.; 3-4 soft packing injection holes are generally provided, preferably in a convenient operating position, and should be avoided as much as possible from the position directly below where it is not easy to operate; one inspection port is generally provided on each side, which can be used as an inspection port during major maintenance, or for periodically cleaning the residue of the soft packing seal.

[0022] Preferably, the three-stage nitrogen sealing chamber includes a soft packing sealing chamber mounting flange, a mechanical seal mounting flange, a sealing gasket, a nitrogen injection hole, and a nitrogen sealing chamber body; at least two nitrogen injection holes are provided, and standard specification connectors are usually used; the pressure of the nitrogen sealing chamber is ensured to be within a certain range, and the performance is good when the pressure is stable.

[0023] Preferably, the three-stage nitrogen sealing chamber can be used to monitor the overall sealing effect of the sealing device online, and to check whether non-metallic seals need to be replaced or whether the entire sealing device needs to be replaced.

[0024] Preferably, the four-stage single-end mechanical seal is typically composed of components such as a stationary ring, a rotating ring, and a spring. The sealing surfaces of the stationary and rotating rings are usually ground and polished to ensure their surface smoothness and flatness. The spring is the main pressure component of the mechanical seal and is usually made of materials such as stainless steel. Its function is to generate pressure to form a certain contact force between the rotating and stationary rings, thereby ensuring the sealing performance.

[0025] There must be a tolerance fit between the bushing and the shaft. Two to three O-rings 6 are installed between the bushing and the shaft for sealing. A bushing gasket 7 is installed at the end of the bushing to further enhance the sealing effect.

[0026] To further improve the sealing effect, in this multi-stage combined compensation rotary shaft sealing device, the primary wedge seal chamber, the secondary soft packing seal, the tertiary nitrogen seal chamber, and the quaternary single-end mechanical seal are preferably connected by flanges. The connecting flanges are fixed with fasteners, and the flanges are sealed using tongue and groove joints, with sealing gaskets on the sealing surfaces. The bushing is mounted on the rotary shaft with tolerance fit, and an anti-rotation key is provided at its end. The bushing is fixed at its tail by a round nut and a stop washer. Two to three O-rings are provided between the bushing and the rotary shaft; the part of the bushing that contacts the shoulder of the rotary shaft is sealed by a bushing gasket.

[0027] To further improve the sealing effect, as a multi-stage combined compensation rotary shaft sealing device of this utility model, preferably, the first-stage wedge sealing chamber, the second-stage soft packing seal, the third-stage nitrogen sealing chamber, and the fourth-stage single-end mechanical seal are arranged sequentially from the inside to the outside. The multi-stage sealing is more conducive to ensuring the overall sealing effect of the sealing device.

[0028] To further improve the sealing effect, as a multi-stage combined compensation rotary shaft sealing device of this utility model, preferably, the secondary soft packing seal can be set in 2-3 stages as needed, and set in parallel with the other sealing chambers to achieve 5-6 stages or even more sealing stages, thereby extending the overall service life of the sealing device.

[0029] To further improve the sealing effect, the preferred four-stage single-end mechanical seal, a multi-stage combined compensation rotary shaft sealing device of this invention, requires regular maintenance and replacement during use to ensure its normal operation and sealing performance. Simultaneously, when selecting and installing the mechanical seal, suitable sealing materials and structural forms should be chosen based on actual conditions to ensure its stability and reliability.

[0030] To further improve the sealing effect, as a multi-stage combined compensation rotary shaft sealing device of this utility model, preferably, the first-stage wedge-shaped sealing chamber is provided with a wedge-shaped sealing ring and a pressure ring, which are easily worn parts; the flanges of the second-stage soft packing seal and the third-stage nitrogen sealing chamber are provided with C-type sealing rings, which are also easily worn parts; a sealing gasket is provided in the middle of each flange, which is also an easily worn part; the corresponding easily worn parts should be inspected and replaced regularly to extend the overall service life of the sealing device.

[0031] Innovatively, each of the above effects exists independently, yet a single structure can be used to combine the results.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims.

Claims

1. A multi-stage combined compensation rotary shaft sealing device, characterized in that, The shaft and bushing pass through the container wall (13); the shaft and bushing are joined together by a pin and can rotate together; On the bushing outside the container wall (13), from the container wall outwards, there are arranged a first-level wedge-shaped sealing chamber, a second-level soft packing sealing chamber, a third-level nitrogen sealing chamber, and a fourth-level single-end mechanical seal. The first-level wedge-shaped sealing chamber (4) consists of an end plate (401), a wedge-shaped sealing ring (402), a pressure ring (403), a sealing cover (404), a mold spring (405), and a countersunk screw (406); The end plate (401) has a hole for the shaft and bushing to pass through, and also includes an annular hole for receiving a wedge-shaped sealing ring (402). The wedge-shaped sealing ring (402) has a cross-section with an inclined surface, and the wedge-shaped sealing ring (402) can be pressed against the inclined surface by an annular pressure ring (403). A mold spring (405) is arranged outside the pressure ring (403) for pressing the wedge-shaped sealing ring (402) and the pressure ring (403). The mold spring (405) is pressed by a sealing cap (404). A threaded hole is provided on the end plate (401) for installing the soft packing sealing chamber (5); The secondary soft packing sealing chamber (5) consists of an end plate mounting flange (501), a C-type sealing ring (502), a snap ring (503), soft packing (504), a soft packing injection hole (505), a soft packing gland (506), a nitrogen sealing chamber mounting flange (507), and an inspection port (508). The inspection port (508) is provided on both sides of the soft packing gland (506) to facilitate the removal of residues after soft packing wear. The end plate mounting flange (501) is fixed to the wedge-shaped sealing chamber (4) by bolts. The end plate mounting flange (501) includes an inner hole for installing the C-type sealing ring (502). The C-type sealing ring (502) is squeezed by the snap ring (503). The soft packing gland (506) is squeezed between the end plate mounting flange (501) and the nitrogen sealing chamber mounting flange (507). The soft packing gland (506) is filled with soft packing (504). A three-stage nitrogen-sealed chamber (2) is provided with a structure for containing nitrogen between two nitrogen-sealed chamber mounting flanges (507); The single-end mechanical seal (1) consists of a stationary ring (102), a rotating ring (103), and a compression spring (104). The stationary ring (102) is the static sealing component of the mechanical seal; the rotating ring (103) is the dynamic sealing component of the mechanical seal. The rotating ring (103) adjusts the gap with the stationary ring by axial movement, thereby achieving a sealing effect; the compression spring (104) squeezes the rotating ring (103) from one side, and the rotating ring (103) squeezes the stationary ring (102).

2. The multi-stage combined compensation rotary shaft sealing device as described in claim 1, characterized in that, There must be a tolerance fit between the bushing and the shaft. Two to three O-ring seals (6) are installed between the bushing and the shaft for sealing. A bushing gasket (7) is installed at the end of the bushing to further enhance the sealing effect.

3. The multi-stage combined compensation rotary shaft sealing device as described in claim 1, characterized in that, The bushing (3) is provided with a key (10) for preventing rotation between the bushing and the shaft. There are three keys for further fixing the bushing and preventing the bushing (3) from rotating in the circumferential direction. The three keys are evenly distributed in the circumferential direction. The bushing (3) is provided with a round nut (11) and a stop washer (12) at the end. The round nut (11) and the stop washer (12) are used to fix the bushing. The end of the round nut is tightly fitted with the bushing (3) to prevent the bushing (3) from moving axially.

4. The multi-stage combined compensation rotary shaft sealing device as described in claim 1, characterized in that, The single-end mechanical seal (1) is connected to the nitrogen sealing chamber (2), the nitrogen sealing chamber (2) is connected to the soft packing sealing chamber (5), and the soft packing sealing chamber (5) is connected to the wedge sealing chamber (4) by flanges. The connecting parts are bolts. All flanges are sealed with tongue and groove surfaces. The tongue and groove surfaces and the groove surfaces cooperate with each other. The sealing gasket (8) is placed in the groove to ensure the sealing between each level of seal.

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