Mechanical seal for horizontal polyester reactor in chemical fiber production

Abstract

The application belongs to the technical field of chemical fiber production, and discloses a mechanical seal for horizontal polyester reactor in chemical fiber production, which comprises a side plate, a sealing mechanism is arranged in the side plate, a stirring shaft is arranged in the sealing mechanism, and a driving mechanism and an impeller are respectively connected to the two ends of the stirring shaft; the sealing mechanism comprises a stationary part fixedly connected to the side surface of the side plate, a dynamic sealing part and a rotating part are arranged in the side plate and the stationary part, and a rotating sleeve is arranged in the dynamic sealing part and the rotating part. Due to the arrangement of the dynamic sealing ring, the close dynamic sealing effect between the dynamic sealing ring and the sealing sleeve can be ensured under the action of the dynamic sealing ring, the friction and close area can be effectively reduced, the material friction resistance can be reduced, and energy consumption can be saved; more importantly, the situation that the particles are clamped between the dynamic sealing ring and the sealing sleeve can be effectively avoided, so that the effect that the dynamic sealing ring and the sealing sleeve cannot be closely sealed can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of chemical fiber production technology, specifically a mechanical seal for a horizontal polyester reactor used in chemical fiber production. Background Technology

[0002] The chemical fiber industry is a continuous production enterprise, which has high requirements for the continuous and stable operation of equipment. Different equipment has its own processing characteristics, but the main equipment is inseparable from the polyester reactor. Most of the existing horizontal polyester reactors use mechanical seals for the stirring shaft to solve the problem of material seeping out from the connection between the stirring shaft and the reactor side plate.

[0003] Existing mechanical seals consist of a stationary component fixed to a side plate, a rotating component fixed to a stirring shaft, and a movable sealing component located outside the rotating component. The movable sealing component and the stationary component use a rotational fit seal, and the contact part is made of a material with extremely high precision and smoothness. However, this cannot completely eliminate wear, which greatly limits its service life. Moreover, the contact surface between the two is a continuous single plane. Once impurities appear, the two will completely lose their fit, resulting in a failure to seal. Therefore, it is necessary to develop a new type of mechanical seal that can further reduce wear and effectively avoid impurity blockage. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a mechanical seal for a horizontal polyester reactor used in chemical fiber production, which has the advantages of durability and long service life.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mechanical seal for a horizontal polyester reactor for chemical fiber production, comprising a side plate, wherein a sealing mechanism is provided inside the side plate, and a stirring shaft passes through the sealing mechanism, wherein a driving mechanism and an impeller are respectively connected to both ends of the stirring shaft;

[0006] The sealing mechanism includes a stationary component fixedly connected to the side of the side plate, and a dynamic sealing component and a rotating component are sleeved inside the side plate and the stationary component. A rotating sleeve is sleeved inside the dynamic sealing component and the rotating component.

[0007] The dynamic sealing component includes a sealing sleeve fitted inside the stationary component. A dynamic sealing ring is provided inside the sealing sleeve. One end of the dynamic sealing ring is tightly fitted to the inner wall of the sealing sleeve, and the other end of the dynamic sealing ring is connected to the rotating component. The sealing sleeve is composed of a sealing plate, a first connecting sleeve, and a second connecting sleeve.

[0008] A gap is left between the first connecting sleeve and the second connecting sleeve near the end of the rotating component, and the dynamic sealing ring is movably sleeved in the gap;

[0009] The dynamic sealing ring includes a sliding sleeve movably disposed within the sealing sleeve. A connecting ring is threaded onto the side of the sliding sleeve surface near the rotating component. The other end of the connecting ring passes through the aforementioned gap, penetrates the sealing sleeve, and extends into the rotating component. Dynamic sealing rings are fixedly connected to both sides of the sliding sleeve, and the other side of the dynamic sealing ring is tightly fitted to the inner wall of the sealing sleeve.

[0010] The first connecting sleeve, the second connecting sleeve, and the connecting ring are all fixedly connected to a static sealing ring at one end of their spiral sleeves inside the sealing plate and the sliding sleeve, and the other side of the static sealing ring is in contact with the sealing plate or the sliding sleeve.

[0011] Preferably, the stationary component and the side plate, as well as the rotating component and the stirring shaft, are sealed by a fixing rubber ring.

[0012] Preferably, both the first connecting sleeve and the second connecting sleeve are threaded onto the side of the sealing plate near the rotating component, the first connecting sleeve is located outside the second connecting sleeve, and the sealing plate and the second connecting sleeve are fitted outside the rotating sleeve.

[0013] Preferably, the rotating component includes a fixed retaining ring fixedly sleeved on the surface of the rotating sleeve, a movable retaining ring movably sleeved outside the rotating sleeve and located between the dynamic sealing component and the fixed retaining ring, a connecting ring fixedly sleeved inside the movable retaining ring, and a compression spring connected between the fixed retaining ring and the movable retaining ring is provided outside the rotating sleeve.

[0014] Preferably, the movable retaining ring and the connecting ring are both provided with limiting grooves on the inner wall of one side of the rotating sleeve. The limiting grooves slide and engage with limiting sliders, and the limiting sliders are fixedly attached to the surface of the rotating sleeve.

[0015] Preferably, the rotating sleeve is externally fixedly fitted with a plurality of flow deflectors located on the side plate and the inner side of the stationary component, as well as on the left and right sides of the dynamic sealing component and the rotating component. The flow deflectors have a frustoconical cross-section, and the diameter of the end of the flow deflector closer to the dynamic sealing component and the rotating component is larger than the diameter of the end of the flow deflector farther away from the dynamic sealing component and the rotating component.

[0016] Preferably, the flow obstructor includes a baffle that is fixedly sleeved on the surface of the rotating sleeve. One end of the baffle away from the dynamic sealing component and the rotating component has an installation groove, and several blades are installed inside the installation groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. Due to the setting of the dynamic sealing ring, the present invention can ensure the dynamic sealing effect between the sealing ring and the sealing sleeve under the action of several dynamic sealing rings, and can also effectively reduce the friction contact area, reduce the material friction resistance, and save energy. More importantly, it can effectively prevent the situation where particulate foreign objects are trapped between the dynamic sealing ring and the sealing sleeve, thereby achieving the effect of preventing the two from not being able to fit tightly and seal.

[0019] 2. Due to the sealing sleeve, the present invention can expose the dynamic sealing ring component by disassembling the sealing plate, the first connecting sleeve and the second connecting sleeve, so that it can be cleaned. It can also disassemble and remove the sliding sleeve and the dynamic sealing ring to replace the worn dynamic sealing components.

[0020] 3. Due to the design of the flow obstruction device, the stirring shaft and rotating sleeve can make several blades rotate rapidly, causing the surrounding material or air to be stirred and rotate rapidly. This effectively prevents particles in the surrounding material from approaching the dynamic sealing component, which not only reduces the impact of particles on the tight fit of the dynamic sealing ring, but also effectively prevents the penetration of internal and external substances.

[0021] 4. Due to the setting of the limiting slider, the present invention can ensure that the movable retaining ring and the connecting ring can rotate with the rotating sleeve with the cooperation of the limiting slide groove. At the same time, it will not affect the spring force of the compression spring to push the movable retaining ring and the dynamic sealing ring to move, achieving the expected effect while avoiding the situation where the fixed retaining ring and the movable retaining ring rotate relative to each other, causing the compression spring to be twisted and damaged. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the disassembly of the structure of the present invention;

[0023] Figure 2 This is an external schematic diagram of the present invention;

[0024] Figure 3 This is a front view of the present invention;

[0025] Figure 4 This is a cross-sectional view of the front of the invention;

[0026] Figure 5 for Figure 4 A front view of a partial cross-section at the rotating sleeve;

[0027] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle;

[0028] Figure 7 This is a schematic diagram of the flow restrictor structure of the present invention.

[0029] In the diagram: 1. Side plate; 2. Sealing mechanism; 21. Stationary component; 22. Dynamic sealing component; 221. Sealing plate; 222. First connecting sleeve; 223. Second connecting sleeve; 224. Sliding sleeve; 225. Dynamic sealing ring; 226. Connecting ring; 227. Stationary sealing ring; 23. Rotating component; 231. Fixed retaining ring; 232. Movable retaining ring; 233. Compression spring; 24. Rotating sleeve; 3. Stirring shaft; 4. Limiting groove; 5. Limiting slider; 6. Flow obstructor; 61. Baffle; 62. Mounting groove; 63. Blade. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 7 As shown, the present invention provides a mechanical seal for a horizontal polyester reactor for chemical fiber production, including a side plate 1, a sealing mechanism 2 is provided inside the side plate 1, a stirring shaft 3 is inserted inside the sealing mechanism 2, and a drive mechanism and an impeller are respectively connected to both ends of the stirring shaft 3.

[0032] The sealing mechanism 2 includes a stationary component 21 fixedly connected to the side of the side plate 1. A dynamic sealing component 22 and a rotating component 23 are fitted inside the side plate 1 and the stationary component 21. A rotating sleeve 24 is fitted inside the dynamic sealing component 22 and the rotating component 23.

[0033] The dynamic sealing component 22 includes a sealing sleeve fitted inside the stationary component 21. A dynamic sealing ring is provided inside the sealing sleeve. One end of the dynamic sealing ring is tightly fitted to the inner wall of the sealing sleeve, and the other end of the dynamic sealing ring is connected to the rotating component 23. The sealing sleeve is composed of a sealing plate 221, a first connecting sleeve 222, and a second connecting sleeve 223. Due to the setting of the dynamic sealing ring, the dynamic sealing effect between the sealing ring and the sealing sleeve can be ensured. Moreover, the dynamic sealing ring 225 can effectively reduce the friction contact area, reduce the material friction resistance, and save energy. More importantly, it can effectively prevent foreign particles from being trapped between the dynamic sealing ring 225 and the sealing sleeve, thereby achieving the effect of preventing the two from failing to fit tightly and seal.

[0034] A gap is left between the first connecting sleeve 222 and the second connecting sleeve 223 near the end of the rotating component 23, and the dynamic sealing ring is movably sleeved in the gap;

[0035] The dynamic sealing ring includes a sliding sleeve 224 movably disposed within the sealing sleeve. A connecting ring 226 is threaded onto the side of the sliding sleeve 224 near the rotating component 23. The other end of the connecting ring 226 passes through the aforementioned gap, penetrates the sealing sleeve, and extends into the rotating component 23. Dynamic sealing rings 225 are fixedly connected to both sides of the sliding sleeve 224. The other side of the dynamic sealing ring 225 is tightly fitted to the inner wall of the sealing sleeve.

[0036] The first connecting sleeve 222, the second connecting sleeve 223, and the connecting ring 226 are screwed into the sealing plate 221 and the sliding sleeve 224, and a static sealing ring 227 is fixedly connected to one end of each of them. The other side of the static sealing ring 227 is in contact with the sealing plate 221 or the sliding sleeve 224. The sliding sleeve 224 will not affect the threaded connection between the connecting ring 226, the first connecting sleeve 222, the second connecting sleeve 223 and the sliding sleeve 224 and the sealing plate 221, and can ensure a fixed static seal between them to prevent leakage.

[0037] like Figure 5 As shown, the stationary component 21 and the side plate 1, as well as the rotating component 23 and the stirring shaft 3, are sealed by a fixed rubber ring.

[0038] like Figure 6 As shown, the first connecting sleeve 222 and the second connecting sleeve 223 are both threaded onto the side of the sealing plate 221 near the rotating component 23. The first connecting sleeve 222 is located outside the second connecting sleeve 223, and the sealing plate 221 and the second connecting sleeve 223 are fitted onto the outside of the rotating sleeve 24. Due to the setting of the sealing sleeve, disassembling the sealing plate 221, the first connecting sleeve 222 and the second connecting sleeve 223 can expose the dynamic sealing ring component, so that it can be cleaned. Moreover, the sliding sleeve 224 and the dynamic sealing ring 225 can be disassembled and removed to replace the worn dynamic sealing components.

[0039] like Figure 5 and Figure 6 As shown, the rotating component 23 includes a fixed retaining ring 231 fixedly sleeved on the surface of the rotating sleeve 24, a movable retaining ring 232 movably sleeved on the outside of the rotating sleeve 24 between the dynamic sealing component 22 and the fixed retaining ring 231, a connecting ring 226 fixedly sleeved inside the movable retaining ring 232, and a compression spring 233 connected between the fixed retaining ring 231 and the movable retaining ring 232 is provided on the outside of the rotating sleeve 24; through the compression spring 233, under its elastic recovery action, it can continuously push the connecting ring 226, so that it pushes the dynamic sealing ring 225 through the sliding sleeve 224, thereby ensuring that the worn dynamic sealing ring 225 under constant pressure can still fit tightly against the inner wall of the sealing sleeve.

[0040] like Figure 1As shown, the movable retaining ring 232 and the connecting ring 226 are both fitted onto the inner wall of the rotating sleeve 24, and both have a limiting groove 4. The limiting groove 4 slides and engages with a limiting slider 5, which is fixedly attached to the surface of the rotating sleeve 24. Due to the setting of the limiting slider 5, with the cooperation of the limiting groove 4, it can be ensured that the movable retaining ring 232 and the connecting ring 226 can rotate with the rotating sleeve 24, while not affecting the spring force of the compression spring 233 to push the movable retaining ring 232 and the dynamic sealing ring to move. This achieves the expected effect while avoiding the situation where the fixed retaining ring 231 and the movable retaining ring 232 rotate relative to each other, which would cause the compression spring 233 to be twisted and damaged.

[0041] like Figure 5 As shown, the rotating sleeve 24 is externally fixedly fitted with several flow deflectors 6 located on the inner side of the side plate 1 and the stationary component 21, as well as on the left and right sides of the dynamic sealing component 22 and the rotating component 23. The flow deflector 6 has a truncated cone shape in cross section. The diameter of the end of the flow deflector 6 near the dynamic sealing component 22 and the rotating component 23 is larger than the diameter of the end away from the dynamic sealing component 22 and the rotating component 23.

[0042] like Figure 7 As shown, the flow obstructor 6 includes a baffle 61 fixedly sleeved on the surface of the rotating sleeve 24. An installation groove 62 is provided at the outer end of the baffle 61 away from the dynamic sealing component 22 and the rotating component 23. Several blades 63 are installed inside the installation groove 62. Due to the setting of the flow obstructor 6, under the action of the stirring shaft 3 and the rotating sleeve 24, the blades 63 can rotate rapidly, causing the surrounding material or air to be agitated and rotate rapidly. This effectively prevents particles in the surrounding material from approaching the dynamic sealing component 22, which not only reduces the impact of particles on the tight fit of the dynamic sealing ring, but also effectively prevents the penetration of internal and external materials.

[0043] Working principle and usage process of this invention:

[0044] The equipment is installed on the horizontal reactor via the side plate 1. The drive unit is turned on to make the stirring shaft 3 drive the stirring impeller at the other end to rotate. Due to the cooperation between the stationary part 21 and the rotating sleeve 24, the material in the reactor will not seep out between the side plate 1 and the stationary part 21 or between the stirring shaft 3 and the rotating sleeve 24. When the stirring shaft 3 drives the rotating sleeve 24 to rotate relative to the stationary part 21, the dynamic sealing part 22 has a seepage leakage problem due to the relative rotation. At this time, under the restriction of the fixed retaining ring 231, due to the cooperation of the limiting slide groove 4 and the limiting slider 5, the spring 233 can restore its elasticity and push the movable retaining ring 232 to slide along the surface of the rotating sleeve 24, and push the connecting ring 226, so that the end of the connecting ring 226 drives the dynamic sealing ring 225 to move left and right through the sliding sleeve 224, thereby making the dynamic sealing rings 225 on both sides fit tightly with the inner cavity of the sealing sleeve.

[0045] Because the contact surface between the dynamic sealing ring 225 and the inner cavity of the sealing sleeve is narrow, it is not easy for foreign objects to get stuck between the contact surfaces. Therefore, it can effectively prevent foreign objects from blocking the two from fitting tightly together to achieve the effect of dynamic sealing.

[0046] The sealing sleeve can be disassembled by separating the sealing plate 221, the first connecting sleeve 222, and the second connecting sleeve 223, and then the lower sleeve 224 and the dynamic sealing ring 225 can be removed to replace the worn dynamic sealing components.

[0047] When the stirring shaft 3 drives the rotating sleeve 24 to rotate rapidly, it can drive the flow obstructors 6 at both ends to rotate rapidly. Due to the rapid movement of the blades 63, the surrounding substances or air can be stirred up to prevent them from approaching the sealing mechanism 2, effectively avoiding penetration. At the same time, it prevents foreign objects and other particulate impurities from entering the sealing mechanism 2 and causing blockage or affecting the fit of the dynamic sealing components.

[0048] 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.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mechanical seal for a horizontal polyester reactor used in chemical fiber production, comprising a side plate (1), characterized in that: The side plate (1) is provided with a sealing mechanism (2), and a stirring shaft (3) is inserted inside the sealing mechanism (2). The two ends of the stirring shaft (3) are respectively connected to a drive mechanism and an impeller. The sealing mechanism (2) includes a stationary component (21) fixedly connected to the side of the side plate (1). The side plate (1) and the stationary component (21) are fitted with a dynamic sealing component (22) and a rotating component (23). The dynamic sealing component (22) and the rotating component (23) are fitted with a rotating sleeve (24). The dynamic sealing component (22) includes a sealing sleeve fitted inside the stationary component (21). A dynamic sealing ring is provided inside the sealing sleeve. One end of the dynamic sealing ring is tightly fitted to the inner wall of the sealing sleeve, and the other end of the dynamic sealing ring is connected to the rotating component (23). The sealing sleeve is composed of a sealing plate (221), a first connecting sleeve (222), and a second connecting sleeve (223). A gap is left between the first connecting sleeve (222) and the second connecting sleeve (223) near the end of the rotating component (23), and the dynamic sealing ring is movably sleeved in the gap; The dynamic sealing ring includes a sliding sleeve (224) movably disposed within the sealing sleeve. A connecting ring (226) is threaded onto the side of the sliding sleeve (224) near the rotating component (23). The other end of the connecting ring (226) passes through the aforementioned gap, penetrates the sealing sleeve, and extends into the rotating component (23). Dynamic sealing rings (225) are fixedly connected to both sides of the sliding sleeve (224). The other side of the dynamic sealing ring (225) is tightly fitted to the inner wall of the sealing sleeve. The first connecting sleeve (222), the second connecting sleeve (223) and the connecting ring (226) are spirally sleeved in the sealing plate (221) and the sliding sleeve (224), and a static sealing ring (227) is fixedly connected to one end of each of them. The other side of the static sealing ring (227) is in contact with the sealing plate (221) or the sliding sleeve (224).

2. The mechanical seal for a horizontal polyester reactor in chemical fiber production according to claim 1, characterized in that: The stationary component (21) and the side plate (1) are sealed with a fixed rubber ring, as are the rotating component (23) and the stirring shaft (3).

3. The mechanical seal for a horizontal polyester reactor in chemical fiber production according to claim 1, characterized in that: The first connecting sleeve (222) and the second connecting sleeve (223) are both threaded onto the side of the sealing plate (221) near the rotating component (23). The first connecting sleeve (222) is located outside the second connecting sleeve (223), and the sealing plate (221) and the second connecting sleeve (223) are fitted onto the outside of the rotating sleeve (24).

4. The mechanical seal for a horizontal polyester reactor in chemical fiber production according to claim 1, characterized in that: The rotating component (23) includes a fixed retaining ring (231) fixedly sleeved on the surface of the rotating sleeve (24), and a movable retaining ring (232) located between the dynamic sealing component (22) and the fixed retaining ring (231) is movably sleeved on the outside of the rotating sleeve (24). The connecting ring (226) is fixedly sleeved inside the movable retaining ring (232), and a compression spring (233) is provided on the outside of the rotating sleeve (24) connecting the fixed retaining ring (231) and the movable retaining ring (232).

5. The mechanical seal for a horizontal polyester reactor in chemical fiber production according to claim 4, characterized in that: The movable retaining ring (232) and the connecting ring (226) are fitted onto the inner wall of one side of the rotating sleeve (24) and both have a limiting groove (4). The limiting groove (4) slides and engages with a limiting slider (5), which is fixedly attached to the surface of the rotating sleeve (24).

6. The mechanical seal for a horizontal polyester reactor in chemical fiber production according to claim 1, characterized in that: The rotating sleeve (24) is externally fixedly fitted with several flow deflectors (6) located on the inner side of the side plate (1) and the stationary component (21), as well as on the left and right sides of the dynamic sealing component (22) and the rotating component (23). The flow deflector (6) has a frustoconical cross section. The diameter of the end of the flow deflector (6) closer to the dynamic sealing component (22) and the rotating component (23) is larger than the diameter of the end farther away from the dynamic sealing component (22) and the rotating component (23).

7. The mechanical seal for a horizontal polyester reactor in chemical fiber production according to claim 6, characterized in that: The flow obstructor (6) includes a baffle (61) fixedly sleeved on the surface of the rotating sleeve (24). An installation groove (62) is provided at one end of the baffle (61) away from the dynamic sealing component (22) and the rotating component (23). Several blades (63) are installed inside the installation groove (62).

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