High-temperature floating ring type corrugated pipe mechanical sealing device for kettle

Abstract

The invention discloses a high-temperature floating ring type corrugated pipe mechanical sealing device for a kettle, and relates to the technical field of mechanical sealing. The mechanical sealing device comprises a center shaft, a first shaft sleeve, a first leakage-proof assembly, a second shaft sleeve and an external friction assembly. The first shaft sleeve and the second shaft sleeve are distributed at intervals in the axial direction of the center shaft and are seamlessly fixed to the periphery of the center shaft. The first leakage-proof assembly comprises a first graphite packing and a limiting mechanism. The first shaft sleeve has a first inner ring groove. The first graphite packing is annularly arranged in the first inner ring groove and closely surrounds the center shaft. The limiting mechanism is connected to the first shaft sleeve and abuts against the first graphite packing. And the external friction assembly is seamlessly sleeved outside the first shaft sleeve and the second shaft sleeve. The central shaft and the first shaft sleeve can generate high temperature when rotating in the external friction assembly, so that a gap is possibly generated between the first shaft sleeve and the central shaft, and the first graphite packing is adopted to tightly surround the central shaft to prevent leakage at the position.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical seals, and in particular to a high-temperature floating ring type bellows mechanical seal device for a kettle. Background Art

[0002] Mechanical seals are shaft sealing devices for fluid rotating machinery. After decades of development, China's mechanical seal industry has become an industry with a complete range of specifications and specifications that can basically meet China's various equipment needs and has a certain degree of international competitiveness. It has become an important basic industry in China's machinery industry.

[0003] At present, domestic manufacturers have their own advantages in sealing devices for horizontal high-temperature kettles. Due to the growth of industrial demand, the research and development of new materials, the development of the energy field, the expansion of the chemical industry, etc., the performance of domestic kettle mechanical seals is also facing greater challenges. The challenges faced by mechanical seals in the new energy market are particularly obvious.

[0004] Since the production process of lithium batteries will generate high temperatures as high as 600°C, the high-temperature kettle sealing device needs good high-temperature resistance to ensure the sealing performance at high temperatures. Importantly, the sealing shaft will be worn when the kettle is opened, which is particularly obvious at high temperatures. Therefore, the sealing device also needs to face the challenge of sealing leakage caused by thermal expansion of metals due to high temperatures. At high temperatures, the sealing material needs to have excellent wear resistance to ensure the service life of the mechanical seal. In addition, the safety of new energy lithium batteries is extremely important. As an important part of it, mechanical seals must ensure the stability and reliability of their structure to avoid safety accidents caused by leakage. Summary of the invention

[0005] In view of the challenge of sealing leakage caused by thermal expansion of metal due to high temperature faced by the sealing device, the present application proposes the following improvement plan.

[0006] A high-temperature floating ring type bellows mechanical sealing device for a kettle comprises a central shaft, a first shaft sleeve, a first anti-leakage component, a second shaft sleeve and an external friction component.

[0007] The first sleeve and the second sleeve are spaced apart and distributed along the axial direction of the central shaft, and are both seamlessly fixed to the outer periphery of the central shaft.

[0008] The first anti-leakage assembly includes a first graphite packing and a limiting mechanism. The first sleeve has a first inner ring groove at one end away from the second sleeve. The first graphite packing is arranged in the first inner ring groove and is bounded by the first sleeve to tightly surround the central axis. The limiting mechanism is connected to the first sleeve and pressed against the first graphite packing, so that the first graphite packing presses against the end of the first inner ring groove closer to the second sleeve.

[0009] The external friction component is seamlessly sleeved outside the first sleeve and the second sleeve. The first sleeve and the second sleeve can rotate in the external friction component under the drive of the central shaft, and the external friction component maintains seamless contact with the first sleeve through the graphite ring.

[0010] By adopting the above technical solution, the center shaft and the first sleeve will generate high temperature when rotating in the external friction component. The first sleeve is generally made of steel and is easy to expand at high temperature, so a gap may be generated between the first sleeve and the center shaft. The first graphite packing is used to tightly surround the center shaft, and the first graphite packing is also pressed against the end of the first inner ring groove closer to the second sleeve, that is, the gap that may be generated between the first sleeve and the center shaft is blocked to prevent leakage here. In addition, during the rotation process, the external friction component maintains seamless contact with the first sleeve through the graphite ring. Since the graphite ring is resistant to high temperatures and is not easy to expand or shrink at high temperatures, its retention mechanism is long-lasting and effective, which enhances the anti-leakage effect.

[0011] A preferred structure of the high-temperature floating ring bellows mechanical seal device for the kettle is that the limiting mechanism includes a first screw, a first support ring and a first clamping spring. The first support ring and the first clamping spring are both arranged on the circumference of the central axis. The first clamping spring is placed in the first inner ring groove. The first support ring is fixed to the first sleeve by the first screw. The first support ring axially abuts against one end of the first clamping spring to compress the first clamping spring and abut against the first graphite packing.

[0012] During the rotational movement, the first sleeve rubs against the sealing device, which easily generates heat and expansion, thereby forming a gap between the first sleeve and the center shaft. By adopting the above technical solution, the gap that may exist between the first sleeve and the center shaft is blocked by the first graphite packing, and the fluid is not easy to flow out of the system through the gap.

[0013] A preferred structure of the high-temperature floating ring bellows mechanical seal device for the kettle is that the external friction component includes a first friction group, a bellows and a second friction group.

[0014] The first friction group includes a jacket seal seat, a plurality of graphite rings and a plurality of positioning rings. The jacket seal seat has an inner cavity with two ends open, and a first inner convex ring and a second inner convex ring are provided on the cavity wall of the inner cavity. The first inner convex ring is farther away from the second sleeve than the second inner convex ring.

[0015] The two ends of the bellows are seamlessly fixed to the jacket sealing seat and the second friction group. The second friction group is tightly sleeved outside the second shaft sleeve.

[0016] The plurality of graphite rings and the plurality of positioning rings are all installed in the inner cavity. The plurality of positioning rings abut against each other and abut against the second inner convex ring and the bellows at both ends.

[0017] The plurality of graphite rings are tightly attached to the outer wall of the first sleeve inwardly, and are also tightly abutted axially against the first inner convex ring, the bellows and the positioning ring.

[0018] By adopting the above technical solution, the first friction group is in contact and relative friction with the first sleeve with multiple graphite rings. Since the graphite rings are tightly attached to the outer wall of the first sleeve inwardly and also tightly abut the first inner convex ring, the bellows and the positioning ring axially, the graphite rings block the gap between the first inner convex ring and the first sleeve, the gap between the positioning ring and the first sleeve, and the gap between the bellows and the first sleeve, so that the first friction group and the first sleeve maintain a good sealing effect during the relative rotation process.

[0019] A preferred structure of the high-temperature floating ring bellows mechanical seal device for the kettle is that the first friction group includes five graphite rings, three positioning rings, four compression springs and four tension springs.

[0020] The three positioning rings are the first positioning ring, the second positioning ring and the third positioning ring, which are seamlessly abutted in sequence, and the first positioning ring is also seamlessly abutted with the second inner convex ring, and the third positioning ring is also seamlessly abutted with the jacket sealing seat and the bellows.

[0021] A compression spring and a graphite ring are installed between the first positioning ring and the first inner convex ring, and the compression spring presses the graphite ring to the first inner convex ring.

[0022] A compression spring and a graphite ring are installed between the second positioning ring and the first positioning ring. The compression spring presses the graphite ring to the second positioning ring, and a tension spring ring is pressed outside the graphite ring.

[0023] A compression spring and a graphite ring are installed between the third positioning ring and the second positioning ring. The compression spring presses the graphite ring to the third positioning ring, and a tension spring ring is pressed outside the graphite ring.

[0024] A compression spring and two mutually abutting graphite rings are installed between the third positioning ring and the bellows. The compression spring presses the two graphite rings to one end face of the bellows. Two tension springs are pressed outside the two graphite rings.

[0025] By adopting the above technical solution, the compression spring can push the graphite ring against the positioning ring, and the tension spring can press the graphite ring against the outer wall of the first sleeve, so that the graphite ring can seal the gap between the positioning ring and the first sleeve. By arranging multiple levels of positioning rings and graphite rings, the sealing effect of the device is enhanced.

[0026] A preferred structure of the high-temperature floating ring bellows mechanical seal device for the kettle is that each positioning ring is an annular structure with an L-shaped cross section, including a vertical ring and a horizontal ring connected vertically, the cross section of the vertical ring constitutes the vertical line of L, and the cross section of the horizontal ring constitutes the horizontal line of L. Each positioning ring is flush with the vertical ring along the axial direction, so that the horizontal rings of each positioning ring are parallel to each other, and multiple groups of graphite rings and compression springs are respectively installed between adjacent horizontal rings, between the horizontal ring and the first inner convex ring, and between the horizontal ring and the bellows.

[0027] By adopting the above technical solution, the positioning rings with L-shaped cross-sections overlap each other, and the first positioning ring at one outer end is also seamlessly abutted with the second inner convex ring, and the third positioning ring at the other outer end is also seamlessly abutted with the jacket sealing seat and the bellows, forming a space for multi-layer installation of graphite rings and compression springs. After installation, a multi-stage sealing structure is formed, which improves the rotating sealing effect between the first friction group and the first sleeve.

[0028] A preferred structure of the high temperature floating ring bellows mechanical seal device for the kettle is that the jacket seal seat is provided with a first cooling water cavity with closed ends, a first water inlet and a first water outlet, the first water inlet and the first water outlet are connected to both sides of the first cooling water cavity, and the first cooling water cavity spacer ring is arranged outside the inner cavity.

[0029] By adopting the above technical solution, cooling water is introduced into the first cooling water chamber. Through heat conduction, the temperature of the internal components will be greatly reduced under the cooling of the circulating cooling water, thereby reducing the thermal expansion deformation effect and improving the service life of the components.

[0030] A preferred structure of the high temperature floating ring bellows mechanical seal device for the kettle is that the bellows has an air inlet, an air cavity and an exhaust port. The air inlet and the exhaust port are both connected to the air cavity. The air cavity is connected to the inner cavity.

[0031] By adopting the above technical solution, nitrogen or other gases are introduced into the air cavity. Under a certain pressure, the graphite ring will produce a certain degree of compressibility on the first sleeve, so that the multi-piece graphite ring has better sealing performance.

[0032] A preferred structure of the high-temperature floating ring bellows mechanical seal device for the kettle is that the second friction group includes a bearing seat, an oil filling ring, a gland, a third screw, a skeleton oil seal, an oil nozzle, a bearing and a rotating sealing ring.

[0033] The bellows is seamlessly fixed to the bearing seat. The bearing seat and the gland are fixedly connected by the third screw. The bearing seat and the gland are sleeved outside the second sleeve. The bearing seat and the gland tightly sleeve the skeleton oil seal, the oil injection ring, the bearing and the rotating seal ring on the outer wall of the second sleeve respectively. The oil nozzle is connected to the oil injection ring. The oil injection ring is connected to the bearing. The skeleton oil seal is located on the side of the oil injection ring away from the bearing. The rotating seal ring is located on the side of the bearing away from the oil injection ring.

[0034] By adopting the above technical solution, oil is injected from the oil nozzle into the oil injection ring, and the oil enters the bearing from the oil injection ring, thereby lubricating the bearing. The skeleton oil seal blocks the oil to prevent the oil from leaking from this side. The rotating seal ring is used to block the oil seeping from the bearing to prevent the oil from leaking from this side. The bearing sleeve and the bearing can alleviate the unbalanced force caused by the center shaft runout from damaging the sealing performance of the seal.

[0035] A preferred structure of the high-temperature floating ring bellows mechanical seal device for the kettle is that the second friction group also includes a second leak-proof component, and the second leak-proof component includes a second graphite packing, a second support ring, a second abutting spring and a second screw. The bearing seat has a second inner ring groove with an open end. The second graphite packing is installed in the second inner ring groove. The second support ring closes the open end of the second inner ring groove. The second support ring abuts against the second graphite packing. The second screw passes through the second abutting spring, the support ring and the bearing seat to fix the support ring to the bearing seat, and the second abutting spring is compressed.

[0036] By adopting the above technical solution, the relative rotational friction between the second sleeve and the bearing seat may easily lead to expansion and produce gaps. The second graphite packing presses the second sleeve inwardly and presses the bearing seat axially, so that the second graphite packing can close the gap that may be produced between the second sleeve and the bearing seat, thereby improving the sealing effect.

[0037] A preferred structure of the high temperature floating ring bellows mechanical seal device for the kettle is that the jacket seal seat is provided with a second cooling water chamber, a second water inlet and a second water outlet. The second water inlet and the second water outlet are arranged on both sides of the second cooling water chamber.

[0038] By adopting the above technical solution, water is introduced into the second cooling water chamber, and the second graphite packing, bearing seat, skeleton oil seal, bearing and rotating sealing ring inside are cooled by heat conduction, thereby reducing the expansion effect and improving the service life of each component.

[0039] In summary, the high-temperature floating ring bellows mechanical seal device for the kettle of the present application has the following beneficial effects: when the central shaft and the first sleeve rotate in the external friction component, high temperature will be generated. The first sleeve is generally made of steel and is easy to expand at high temperature, so a gap may be generated between the first sleeve and the central shaft. The first graphite packing is used to tightly surround the central shaft, and the first graphite packing is also pressed against the end of the first inner ring groove closer to the second sleeve, that is, the gap that may be generated between the first sleeve and the central shaft is blocked to prevent leakage here. In addition, during the rotation process, the external friction component maintains seamless contact with the first sleeve through the graphite ring. Since the graphite ring is resistant to high temperatures and is not easy to expand or shrink at high temperatures, its retention mechanism is long-lasting and effective, which enhances the anti-leakage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The present invention is a cross-sectional view of a high-temperature floating ring bellows mechanical seal device for a kettle.

[0041] Figure 2 This is an appearance diagram of the hidden center axis of the high-temperature floating ring bellows mechanical seal device for the kettle.

[0042] Figure 3 The present invention is a cross-sectional view of a jacket seal seat in a high-temperature floating ring bellows mechanical seal device for a kettle.

[0043] Figure 4 This is a cross-sectional view of the bellows in the high-temperature floating ring bellows mechanical seal device for the kettle.

[0044] Figure 5 This is a cross-sectional view of the bearing seat in the high-temperature floating ring bellows mechanical seal device for the kettle.

[0045] Reference numerals: 100, center shaft; 12, first sleeve; 20, second sleeve; 41, first graphite packing; 1, first screw; 2, first support ring; 3, first tightening spring; 13, bellows; 5, jacket seal seat; 36, graphite ring; 7, first inner convex ring; 8, second inner convex ring; 4, graphite sealing gasket; 6, locking screw; 200, container; 40, compression spring; 39, tension spring; 9, first positioning ring; 10, second positioning ring; 11, third positioning ring; 37, vertical ring; 38, horizontal ring; 51 , the first cooling water chamber; 52, the first water inlet; 53, the first water outlet; 131, the air inlet; 132, the air chamber; 133, the exhaust port; 16, the bearing seat; 17, the oil filling ring; 18, the pressure cover; 19, the third screw; 22, the skeleton oil seal; 24, the oil nozzle; 26, the bearing; 28, the rotating sealing ring; 25, the retaining ring; 30, the second graphite packing; 15, the second supporting ring; 14, the second clamping spring; 31, the second screw; 161, the second cooling water chamber; 162, the second water inlet; 163, the second water outlet. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the following embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] like Figure 1 A high-temperature floating ring bellows mechanical seal device for a kettle includes a central shaft 100, a first sleeve 12, a first anti-leakage component, a second sleeve 20 and an external friction component.

[0048] The first sleeve 12 and the second sleeve 20 are spaced apart along the axial direction of the central shaft 100 and are both seamlessly fixed to the outer circumference of the central shaft 100 by screws and can rotate with the central shaft 100. The second sleeve 20 and the central shaft 100 are tightly abutted by an O-ring to prevent leakage.

[0049] The first sleeve 12 and the second sleeve 20 may both be made of steel, and their outer surfaces may be nickel-plated to enhance their wear resistance and reduce the risk of leakage caused by wear of the first sleeve 12 and the second sleeve 20 .

[0050] The first anti-leakage component includes four first graphite packings 41 and a limiting mechanism. The end of the first sleeve 12 away from the second sleeve 20 has a first inner ring groove. The four first graphite packings 41 are tightly stacked and arranged in the first inner ring groove, and are bound by the first sleeve 12 and tightly surround the central shaft 100. The limiting mechanism is connected to the first sleeve 12 and presses against the four first graphite packings 41, so that the four first graphite packings 41 press against the end of the first inner ring groove closer to the second sleeve 20. That is, the first sleeve 12 and the central shaft 100 are tightly abutted by the first graphite packings 41. Since the first sleeve 12 is in contact with high-temperature materials, the leakage caused by the high-temperature expansion of the first sleeve 12 can be prevented through the flexible sealing of the first graphite packings 41.

[0051] The external friction assembly is seamlessly sleeved outside the first sleeve 12 and the second sleeve 20. The first sleeve 12 and the second sleeve 20 can rotate in the external friction assembly under the drive of the central shaft 100, and the external friction assembly maintains seamless contact with the first sleeve 12 through a plurality of graphite rings 36. The graphite ring 36 is preferably an integrated graphite ring 36. Since the graphite ring 36 has excellent sealing performance, can withstand higher temperatures, is more suitable for high temperature conditions, has excellent resistance to many corrosive media, can work under many harsh conditions, and the carbon ring itself has self-lubricating properties, which can effectively reduce the wear of the seal. The use of an integrated graphite ring 36 can better adapt to the vibration and deviation of the central shaft 100 and maintain the stability of the seal.

[0052] When the central shaft 100 and the first sleeve 12 rotate in the external friction assembly, high temperature will be generated. The first sleeve 12 is generally made of steel and is easy to expand at high temperature, so a gap may be generated between the first sleeve 12 and the central shaft 100. Compared with the traditional first sleeve 12, the device adds a seal of the first graphite packing 41 on the original basis, which can reduce the possibility of material leakage caused by the thermal expansion of steel at high temperature. The device specifically uses the first graphite packing 41 to tightly surround the central shaft 100, and the first graphite packing 41 also presses against the end of the first inner ring groove closer to the second sleeve 20, that is, the gap that may be generated between the first sleeve 12 and the central shaft 100 is blocked to prevent leakage here. In addition, during the rotation process, the external friction assembly maintains seamless contact with the first sleeve 12 through the graphite ring 36. Since the graphite ring 36 is resistant to high temperatures and is not easy to expand or shrink at high temperatures, its retention mechanism is long-lasting and effective, which enhances the anti-leakage effect.

[0053] The high-temperature floating ring bellows mechanical seal device for the kettle adopts new processing technology and technology to control the damage of the mechanical seal components caused by high temperature, so that the mechanical seal device can operate normally at high temperature to achieve the expected use results. Compared with traditional mechanical seals, this device has better sealing, wear resistance and longer service life. This device can be used in the chemical industry, material chemistry, metallurgical industry, energy field, petrochemical industry, new energy development, semiconductor manufacturing, pharmaceutical industry, etc. These fields have different requirements for the mechanical seal performance of the kettle, and different performance is required in different situations, such as high temperature resistance, corrosion resistance, high pressure resistance, high speed resistance, etc. This device can better meet the requirements.

[0054] The limiting mechanism includes a first screw 1, a first support ring 2 and a first clamping spring 3. The first support ring 2 and the first clamping spring 3 are both arranged around the circumference of the central shaft 100. The first clamping spring 3 is placed in the first inner ring groove. The first support ring 2 is fixed to the first sleeve 12 by the first screw 1. The first support ring 2 axially abuts against one end of the first clamping spring 3, compressing the first clamping spring 3 and abutting against the first graphite packing 41.

[0055] During the rotational movement, the first sleeve 12 rubs against the sealing device, which easily generates heat and expands, resulting in a gap between the first sleeve 12 and the central shaft 100. After adopting the above solution, the gap that may exist between the first sleeve 12 and the central shaft 100 is blocked by the first graphite packing 41, and the fluid is not easy to flow out of the system through the gap. The above limit mechanism adopts an elastic seal based on the first tightening spring 3 when sealing the first graphite packing 41, reducing the excessive impact on the first graphite packing 41 due to excessive axial force.

[0056] The external friction assembly includes a first friction group, a bellows 13 and a second friction group.

[0057] The first friction group includes a jacket seal seat 5, a plurality of graphite rings 36 and a plurality of positioning rings. The jacket seal seat 5 is made of high-temperature resistant high alloy steel. The jacket seal seat 5 has an inner cavity with two ends open, and a first inner convex ring 7 and a second inner convex ring 8 are provided on the cavity wall of the inner cavity. The first inner convex ring 7 is further away from the second shaft sleeve 20 than the second inner convex ring 8.

[0058] The end of the jacket seal seat 5 away from the bellows 13 has a seamless butt joint structure for butting against the interface of the container 200 for loading materials. The seamless butt joint structure may include a flange end, a graphite seal 4 and a locking screw 6, and the locking screw 6 may be a hexagon socket head screw. The flange end is butted against the flange interface of the container 200, the graphite seal 4 is installed at the butt joint, and is locked with a hexagon socket head screw, so that the jacket seal seat 5 is seamlessly butted against the container 200 to prevent material leakage.

[0059] like Figure 2 In the middle of the device, the two ends of the bellows 13 are flange structures, which are seamlessly fixed to the end surface of the jacket seal seat 5 and the second friction group through O-rings. The second friction group is tightly sleeved outside the second sleeve 20. The bellows 13 can effectively reduce the impact of vibration and deformation on the mechanical sealing performance and reduce the damage caused by the rotation shear of the central shaft 100.

[0060] The graphite rings 36 and the positioning rings are installed in the inner cavity. The positioning rings are tightly abutted against each other through O-rings, and the two outer ends of the positioning rings are respectively abutted against the second inner convex ring 8 and the bellows 13 through O-rings.

[0061] The plurality of graphite rings 36 are tightly attached to the outer wall of the first sleeve 12 inwardly, and are also tightly abutted axially against the first inner convex ring 7, the bellows 13 and the positioning ring.

[0062] The first friction group has a plurality of graphite rings 36 in contact and relative friction with the first sleeve 12. Since the graphite rings 36 are tightly attached to the outer wall of the first sleeve 12 inwardly and also axially tightly abut against the first inner convex ring 7, the bellows 13 and the positioning ring, the graphite rings 36 block the gap between the first inner convex ring 7 and the first sleeve 12, the gap between the positioning ring and the first sleeve 12, and the gap between the bellows 13 and the first sleeve 12, so that the first friction group and the first sleeve 12 maintain a good sealing effect during the relative rotation process.

[0063] The first friction group includes five graphite rings 36 , three positioning rings, four compression springs 40 and four tension springs 39 .

[0064] The three positioning rings are a first positioning ring 9 , a second positioning ring 10 and a third positioning ring 11 , which are seamlessly connected in sequence. The first positioning ring 9 is also seamlessly connected to the second inner convex ring 8 , and the third positioning ring 11 is also seamlessly connected to the jacket sealing seat 5 and the bellows 13 .

[0065] A compression spring 40 and a graphite ring 36 are installed between the first positioning ring 9 and the first inner convex ring 7 . The compression spring 40 presses the graphite ring 36 against the first inner convex ring 7 .

[0066] A compression spring 40 and a graphite ring 36 are installed between the second positioning ring 10 and the first positioning ring 9 . The compression spring 40 presses the graphite ring 36 against the second positioning ring 10 . A tension spring 39 is pressed outside the graphite ring 36 .

[0067] A compression spring 40 and a graphite ring 36 are installed between the third positioning ring 11 and the second positioning ring 10 . The compression spring 40 presses the graphite ring 36 to the third positioning ring 11 . A tension spring 39 is pressed outside the graphite ring 36 .

[0068] A compression spring 40 and two mutually abutting graphite rings 36 are installed between the third positioning ring 11 and the bellows 13 . The compression spring 40 presses the two graphite rings 36 to one end surface of the bellows 13 . Two tension springs 39 are pressed outside the two graphite rings 36 .

[0069] The compression spring 40 can press the graphite ring 36 against the positioning ring, and the tension spring 39 can press the graphite ring 36 against the outer wall of the first sleeve 12, so that the graphite ring 36 can block the gap between the positioning ring and the first sleeve 12. By setting up multiple levels of positioning rings and graphite rings 36, the sealing effect of the device is enhanced.

[0070] The device adopts a multi-layer floating ring sealing structure to maintain the stability of the seal, which can reduce the risk of material leakage due to front-end seal failure and significantly improve the sealing effect.

[0071] Each positioning ring may be an annular structure with an L-shaped cross section, including a vertical ring 37 and a horizontal ring 38 connected vertically, wherein the cross section of the vertical ring 37 forms the vertical line of the L, and the cross section of the horizontal ring 38 forms the horizontal line of the L. Each positioning ring is flushly abutted along the axial direction with the vertical ring 37, so that the horizontal rings 38 of each positioning ring are parallel to each other, and a combination of multiple groups of graphite rings 36 and compression springs 40 are respectively installed between adjacent horizontal rings 38, between the horizontal ring 38 and the first inner convex ring 7, and between the horizontal ring 38 and the bellows 13.

[0072] The positioning rings with L-shaped cross sections overlap each other, and the first positioning ring 9 located at one outer end is also seamlessly abutted with the second inner convex ring 8, and the third positioning ring 11 at the other outer end is also seamlessly abutted with the jacket sealing seat 5 and the bellows 13, forming a space for multi-layer installation of graphite rings 36 and compression springs 40. After installation, a multi-stage sealing structure is formed, which improves the rotational sealing effect between the first friction group and the first sleeve 12.

[0073] like Figure 3 The jacket seal seat 5 is provided with a first cooling water chamber 51 with closed ends, a first water inlet 52 and a first water outlet 53. The first water inlet 52 and the first water outlet 53 are connected to both sides of the first cooling water chamber 51. The first cooling water chamber 51 is provided with a spacer ring outside the inner chamber. Cooling water is introduced into the first cooling water chamber 51. Through heat conduction, the temperature of the internal components will be greatly reduced under the cooling of the circulating cooling water, thereby reducing the thermal expansion deformation effect and improving the service life of the components.

[0074] like Figure 4 , the bellows 13 has an air inlet 131, an air cavity 132 and an exhaust port 133. The air inlet 131 and the exhaust port 133 are both connected to the air cavity 132. The air cavity 132 is connected to the inner cavity. Firstly, when nitrogen or other gases are introduced into the air cavity 132, under a certain pressure, the graphite ring 36 will produce a certain degree of compressibility on the first sleeve 12, so that the multi-piece graphite ring 36 has better sealing performance. Secondly, the metal bellows 13 has good ductility and compressibility, which can compensate and absorb the axial force and radial force generated by the central shaft 100 during operation, and better ensure the sealing performance.

[0075] The second friction group includes a bearing seat 16 , an oil filling ring 17 , a pressure cover 18 , a third screw 19 , a skeleton oil seal 22 , an oil nozzle 24 , a bearing 26 , a rotary sealing ring 28 and a retaining ring 25 .

[0076] The flange end of the bellows 13 is seamlessly fixed to the upper end surface of the bearing seat 16 through an O-ring. The bearing seat 16 and the pressure cover 18 are fixedly connected by the third screw 19 through the groove ring provided by themselves. The third screw 19 can be a hexagon socket screw. The bearing seat 16 and the pressure cover 18 are sleeved on the outer wall of the second sleeve 20. The bearing seat 16 and the pressure cover 18 respectively tightly sleeve the skeleton oil seal 22, the oil filling ring 17, the bearing 26 and the rotating seal ring 28 on the outer wall of the second sleeve 20. The oil nozzle 24 is connected to the oil filling ring 17. The oil filling ring 17 is connected to the bearing 26. The skeleton oil seal 22 is located on the side of the oil filling ring 17 away from the bearing 26. The rotating seal ring 28 is located on the side of the bearing 26 away from the oil filling ring 17. The retaining ring 25 is arranged outside the oil filling ring 17 to limit the oil filling ring 17, so that the oil filling ring 17 is easy to install. Oil is injected from the oil nozzle 24 into the oil injection ring 17, and the oil enters the bearing 26 from the oil injection ring 17, thereby lubricating the bearing 26. The skeleton oil seal 22 blocks the oil to prevent the oil from leaking from this side. The rotating seal ring 28 is used to block the oil that seeps from the bearing 26 to prevent the oil from leaking from this side. The bearing 26 sleeve and the bearing 26 can alleviate the unbalanced force caused by the vibration of the central shaft 100 from damaging the sealing performance of the seal.

[0077] The device adopts a multi-layer floating ring sealing structure to maintain the stability of the seal, which can reduce the risk of material leakage caused by front-end seal failure, so that the sealing effect is significantly improved. If a leak occurs at the front end, the leaked material is easily blocked by the skeleton oil seal 22 and the rotating seal ring 28 and is not easy to directly contact the air, so that the material is not easy to leak out of the device.

[0078] The second friction group also includes a second anti-leakage component, which is connected to one end of the bearing seat 16 facing the bellows 13. The second anti-leakage component includes three second graphite packings 30, a second support ring 15, a second clamping spring 14 and a second screw 31. The second screw 31 can be a hexagon socket screw. The bearing seat 16 has a second inner ring groove with an open end. The three second graphite packings 30 are installed in the second inner ring groove. The second support ring 15 closes the open end of the second inner ring groove. The second support ring 15 clamps against the three stacked second graphite packings 30. The second screw 31 passes through the second clamping spring 14, the support ring and the bearing seat 16 to fix the support ring to the bearing seat 16, and the second clamping spring 14 is compressed.

[0079] The relative rotation friction between the second sleeve 20 and the bearing seat 16 may easily lead to expansion and gaps. The second graphite packing 30 presses against the second sleeve 20 inwardly and presses against the bearing seat 16 axially, so that the second graphite packing 30 can close the gap that may be generated between the second sleeve 20 and the bearing seat 16, thereby improving the sealing effect. Adding a bearing 26 outside the second sleeve 20 can alleviate the damage to the sealing performance of the seal caused by the unbalanced force caused by the vibration of the central shaft 100.

[0080] like Figure 5 The jacket seal seat 5 is provided with a second cooling water chamber 161, a second water inlet 162 and a second water outlet 163. The second water inlet 162 and the second water outlet 163 are arranged on both sides of the second cooling water chamber 161. Water is introduced into the second cooling water chamber 161, and the second graphite packing 30, the bearing seat 16, the skeleton oil seal 22, the bearing 26 and the rotating seal ring 28 are cooled by heat conduction, thereby reducing the expansion effect, reducing the damage to each seal caused by heat conduction, and improving the service life of each component. The device uses the bearing seat 16 to replace the retaining ring of the general technology to fix the inner ring of the bearing 26, thereby reducing the risk of the inner ring of the bearing 26 falling off due to the failure of the retaining ring.

[0081] For mechanical seals for high-temperature kettles, the excellent sealing performance and long service life of the floating ring bellows mechanical seal structure are particularly important for a sealing device. This application performs multiple sets of sealing and two sets of cooling treatments on the mechanical seal, improves the processing accuracy of the sealing components and performs nickel-plating treatment, so as to achieve the strict sealing requirements of the high-temperature kettle.

[0082] The performance of the high-temperature floating ring bellows mechanical seal device for the kettle was evaluated under different temperature and pressure conditions. The experiment proved that the mechanical seal device has good sealing performance at high temperature and has excellent stability and reliability.

[0083] Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A high temperature floating ring bellows mechanical seal device for kettle, It is characterized in that It comprises a central shaft (100), a first shaft sleeve (12), a first anti-leakage component, a second shaft sleeve (20) and an external friction component; The first shaft sleeve (12) and the second shaft sleeve (20) are spaced apart along the axial direction of the central shaft (100), and are both seamlessly fixed to the outer circumference of the central shaft (100); The first anti-leakage component comprises a first graphite packing (41) and a limiting mechanism; the first sleeve (12) has a first inner ring groove at one end away from the second sleeve (20); the first graphite packing (41) is arranged in the first inner ring groove and is bounded by the first sleeve (12) to tightly surround the central axis (100); the limiting mechanism is connected to the first sleeve (12) and pressed against the first graphite packing (41), so that the first graphite packing (41) presses against the end of the first inner ring groove closer to the second sleeve (20); The external friction component is seamlessly sleeved outside the first sleeve (12) and the second sleeve (20); the first sleeve (12) and the second sleeve (20) can rotate within the external friction component under the drive of the central shaft (100), and the external friction component maintains seamless contact with the first sleeve (12) through a graphite ring (36).

2. The high temperature floating ring bellows mechanical seal device for kettle according to claim 1, It is characterized in that The limiting mechanism comprises a first screw (1), a first support ring (2) and a first clamping spring (3); the first support ring (2) and the first clamping spring (3) are both arranged around the circumference of the central axis (100); the first clamping spring (3) is inserted into the first inner ring groove; the first support ring (2) is fixed to the first shaft sleeve (12) by the first screw (1); the first support ring (2) axially abuts against one end of the first clamping spring (3), compresses the first clamping spring (3) and clamps the first graphite packing (41).

3. The high temperature floating ring bellows mechanical seal device for kettle according to claim 1, It is characterized in that The external friction assembly comprises a first friction group, a bellows (13) and a second friction group; The first friction group comprises a jacket sealing seat (5), a plurality of graphite rings (36) and a plurality of positioning rings; the jacket sealing seat (5) has an inner cavity with two ends open, and a first inner convex ring (7) and a second inner convex ring (8) are provided on the cavity wall of the inner cavity; the first inner convex ring (7) is further away from the second shaft sleeve (20) than the second inner convex ring (8); The two ends of the bellows (13) are respectively seamlessly fixed to the jacket sealing seat (5) and the second friction group; the second friction group is tightly sleeved outside the second shaft sleeve (20); The plurality of graphite rings (36) and the plurality of positioning rings are all installed in the inner cavity; the plurality of positioning rings abut against each other and abut against the second inner convex ring (8) and the bellows (13) at both ends respectively; The plurality of graphite rings (36) are tightly attached inwardly to the outer wall of the first shaft sleeve (12), and are also tightly abutted axially against the first inner convex ring (7), the bellows (13), and the positioning ring.

4. The high temperature floating ring bellows mechanical seal device for kettle according to claim 3, It is characterized in that The first friction group comprises five graphite rings (36), three positioning rings, four compression springs (40) and four tension springs (39); The three positioning rings are a first positioning ring (9), a second positioning ring (10) and a third positioning ring (11), which are seamlessly abutted in sequence, and the first positioning ring (9) is also seamlessly abutted with the second inner convex ring (8), and the third positioning ring (11) is also seamlessly abutted with the jacket sealing seat (5) and the bellows (13); A compression spring (40) and a graphite ring (36) are installed between the first positioning ring (9) and the first inner convex ring (7), and the compression spring (40) presses the graphite ring (36) onto the first inner convex ring (7); A compression spring (40) and a graphite ring (36) are installed between the second positioning ring (10) and the first positioning ring (9), the compression spring (40) presses the graphite ring (36) onto the second positioning ring (10), and a tension spring (39) is pressed outside the graphite ring (36); A compression spring (40) and a graphite ring (36) are installed between the third positioning ring (11) and the second positioning ring (10), the compression spring (40) presses the graphite ring (36) onto the third positioning ring (11), and a tension spring (39) is pressed outside the graphite ring (36); A compression spring (40) and two graphite rings (36) abutting against each other are installed between the third positioning ring (11) and the bellows (13). The compression spring (40) presses the two graphite rings (36) against one end surface of the bellows (13). Two tension springs (39) are pressed against the outside of the two graphite rings (36).

5. The high temperature floating ring bellows mechanical seal device for kettle according to claim 4, It is characterized in that Each positioning ring is an annular structure with an L-shaped cross section, comprising a vertical ring (37) and a horizontal ring (38) connected vertically, wherein the cross section of the vertical ring (37) forms the vertical line of the L, and the cross section of the horizontal ring (38) forms the horizontal line of the L; each positioning ring is axially flush with the vertical ring (37), so that the horizontal rings (38) of each positioning ring are parallel to each other, and a combination of multiple groups of graphite rings (36) and compression springs (40) are respectively installed between adjacent horizontal rings (38), between the horizontal ring (38) and the first inner convex ring (7), and between the horizontal ring (38) and the bellows (13).

6. The high temperature floating ring bellows mechanical seal device for kettle according to any one of claims 3 to 5, It is characterized in that The jacket sealing seat (5) is provided with a first cooling water cavity (51) with closed ends, a first water inlet (52) and a first water outlet (53), wherein the first water inlet (52) and the first water outlet (53) are connected to two sides of the first cooling water cavity (51); and a spacer ring of the first cooling water cavity (51) is arranged outside the inner cavity.

7. The high temperature floating ring bellows mechanical seal device for a kettle according to any one of claims 3 to 5, It is characterized in that The bellows (13) comprises an air inlet (131), an air cavity (132) and an air outlet (133); the air inlet (131) and the air outlet (133) are both connected to the air cavity (132); and the air cavity (132) is connected to the inner cavity.

8. The high temperature floating ring bellows mechanical seal device for a kettle according to any one of claims 3 to 5, It is characterized in that The second friction assembly comprises a bearing seat (16), an oil filling ring (17), a gland (18), a third screw (19), a skeleton oil seal (22), an oil nozzle (24), a bearing (26) and a rotating sealing ring (28); The bellows (13) is seamlessly fixed to the bearing seat (16); the bearing seat (16) and the pressure cover (18) are fixedly connected by the third screw (19); the bearing seat (16) and the pressure cover (18) are sleeved outside the second shaft sleeve (20); the bearing seat (16) and the pressure cover (18) respectively tightly sleeve the skeleton oil seal (22), the oil injection ring (17), the bearing (26) and the rotating seal ring (28) on the outer wall of the second shaft sleeve (20); the oil nozzle (24) is connected to the oil injection ring (17); the oil injection ring (17) is connected to the bearing (26); the skeleton oil seal (22) is located on a side of the oil injection ring (17) away from the bearing (26); and the rotating seal ring (28) is located on a side of the bearing (26) away from the oil injection ring (17).

9. The high temperature floating ring bellows mechanical seal device for kettle according to claim 8, It is characterized in that The second friction group further comprises a second anti-leakage component, which comprises a second graphite packing (30), a second support ring (15), a second abutting spring (14) and a second screw (31); the bearing seat (16) has a second inner ring groove with one end open; the second graphite packing (30) is installed in the second inner ring groove; the second support ring (15) closes the open end of the second inner ring groove; the second support ring (15) abuts against the second graphite packing (30); the second screw (31) passes through the second abutting spring (14), the support ring and the bearing seat (16) to fix the support ring to the bearing seat (16), and the second abutting spring (14) is compressed.

10. The high temperature floating ring bellows mechanical seal device for kettle according to claim 8, It is characterized in that The jacket sealing seat (5) is provided with a second cooling water chamber (161), a second water inlet (162) and a second water outlet (163); the second water inlet (162) and the second water outlet (163) are arranged on both sides of the second cooling water chamber (161).

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