Special fan for chemical fiber industry

Abstract

The utility model relates to the field of fans, and discloses a fan special for the chemical fiber industry. An impeller is rotatably arranged in the machine shell, one end of the transmission shaft is inserted into the machine shell and connected with the impeller, a multi-stage carbon ring sealing assembly is arranged at the connecting position of the machine shell and the transmission shaft, and the multi-stage carbon ring sealing assembly is suitable for forming multiple seals on the connecting position of the machine shell and the transmission shaft. A shaft head sealing assembly is arranged at the end, located in the impeller, of the transmission shaft and suitable for sealing the joint of the impeller and the transmission shaft. The sealing performance is obviously enhanced, gas leakage is prevented, and the product quality and the stability of the production environment are improved; the maintenance convenience is improved, the maintenance cost and time are reduced, and the continuity of chemical fiber production is guaranteed; and the operating condition range of the fan is expanded, the surge phenomenon is avoided, the safety and reliability of the system are improved, and efficient chemical fiber production is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field, specifically, relate to a special fan of chemical fiber industry. BACKGROUND

[0002] The fan includes a casing, an impeller, a transmission set and a motor. The impeller is arranged inside the casing. The transmission set is provided with a transmission shaft. The transmission shaft is inserted into the casing and connected with the impeller. The motor is connected with the transmission shaft to drive the transmission shaft to rotate and drive the impeller to rotate. In the chemical fiber production process, the performance, sealing performance and reliability of the fan are required to be high. The existing sealing structure between the casing and the transmission shaft is only provided with a sealing ring. The sealing performance is low. Gas leakage or impure gas conveying may occur, which will seriously affect the production quality. SUMMARY

[0003] To solve at least one aspect of the above problems, the utility model provides a special fan of chemical fiber industry, including casing and transmission shaft, the casing inside rotation is equipped with the impeller, transmission shaft one end inserts the casing inside and is connected with the impeller, transmission shaft other end is suitable for with motor connection, the casing with transmission shaft junction is equipped with multistage carbon ring sealing assembly, multistage carbon ring sealing assembly is suitable for to the casing with transmission shaft junction forms multichannel sealing, transmission shaft with the one end of impeller connection inserts transmission shaft inside, the one end of transmission shaft in the impeller inside is equipped with the axle head sealing assembly, the axle head sealing assembly is suitable for to the impeller with transmission shaft junction carries out sealing.

[0004] Optionally, the impeller is a backward type impeller.

[0005] Optionally, the multistage carbon ring sealing assembly includes a sealing box connected to the casing, the sealing box is sleeved on the transmission shaft, and a plurality of sealing carbon rings are arranged in the sealing box. The plurality of sealing carbon rings are arranged along the axial direction of the transmission shaft, are sleeved on the transmission shaft and tightly fit with the transmission shaft, and the outer peripheral walls of the plurality of sealing carbon rings tightly fit with the inner peripheral walls of the sealing box.

[0006] Optionally, the sealing box is provided with a mounting ring groove, the outer peripheral walls of the sealing carbon rings are inserted into the mounting ring grooves, and the number of the mounting ring grooves is consistent with and corresponds to the number of the sealing carbon rings.

[0007] Optionally, the impeller is fixed with a shaft sleeve, the transmission shaft is inserted into the shaft sleeve and is keyed connected with the shaft sleeve, the shaft head sealing assembly comprises a sealing ring pad and a pressing end cover, the sealing ring pad is located on the side of the shaft sleeve away from the multi-stage carbon ring sealing assembly and is sleeved on the transmission shaft, the sealing ring pad is tightly attached to the transmission shaft, the pressing end cover is sleeved on the transmission shaft, and the opposite sides of the sealing ring pad are tightly attached to the pressing end cover and the shaft sleeve respectively.

[0008] Optionally, a groove is arranged on the outer peripheral wall of the pressing end cover, the groove penetrates the pressing end cover along the axial direction of the transmission shaft, and the outer peripheral wall of the sealing ring pad is provided with a clamping jaw piece which is obliquely extended and is inserted into the groove.

[0009] Optionally, the special fan for chemical fiber industry further comprises a damping support, the damping support comprises an upper support, a lower support and a spring damper, the casing is detachably connected with the upper support, and the two sides of the spring damper are connected with the upper support and the lower support respectively.

[0010] Optionally, a limiting support assembly is detachably arranged between the upper support and the lower support, the two sides of the limiting support assembly are abutted against the upper support and the lower support respectively, and the limiting support assembly is suitable for driving the upper support to be not easy to shake relative to the lower support.

[0011] Optionally, the limiting support assembly comprises a threaded pull rod and a support plate, the two ends of the threaded pull rod pass through the upper support and the lower support respectively, threaded nuts are threadedly installed at the two ends of the threaded pull rod respectively, the support plate is located between the upper support and the lower support, the two sides of the support plate are abutted against the upper support and the lower support respectively, an insertion slot is arranged on the side outer wall of the support plate, and the portion of the threaded pull rod located between the upper support and the lower support is inserted into the insertion slot.

[0012] Optionally, a plurality of spring dampers and limiting support assemblies are arranged, and the plurality of spring dampers and limiting support assemblies are circumferentially spaced apart along the lower support.

[0013] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0014] 1. The connection between the casing and the transmission shaft is realized by the multi-stage carbon ring sealing assembly, the multi-stage carbon ring mechanical sealing is realized, the shaft head sealing assembly is adopted for sealing in the front part of the impeller, the problem of leakage of nitrogen and other gases along the inner hole of the shaft sleeve is prevented, the sealing property of the fan system in the chemical fiber production process is ensured, and the stability of the production environment and the product quality are ensured.

[0015] 2、The fan shell and the support adopt an integral structure and can be detachably designed, when the inside of the fan needs to be overhauled or parts are replaced, an operator can conveniently separate the fan shell from the support, maintenance efficiency is improved, and maintenance cost is reduced;

[0016] 3、The fan adopts a double-layer damping support, can well absorb vibration generated when the fan operates, reduces the influence of the vibration on the fan itself and surrounding equipment, improves operation stability and equipment life of the fan, in addition, the damping support can be directly placed on a plant platform without foundation bolts, which not only simplifies the installation process of the fan, improves installation efficiency, but also enhances the adaptability of the fan in different plant environments, reduces installation cost and requirements for plant infrastructure;

[0017] 4、The operation condition range of the fan is enlarged, the surge phenomenon is avoided, the safety and reliability of the system are improved, and efficient chemical fiber production is ensured;

[0018] 5、The forward type impeller has low fan efficiency, large noise, and steep operation condition curve, and performance fluctuation is relatively large when the working condition changes slightly, and the backward type impeller can effectively avoid airflow separation and vortex generation, to ensure stable high pressure output and low energy loss. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an overall structure diagram of the fan in the embodiment of the utility model;

[0020] Figure 2 It is an explosion view of the casing, the impeller, the multistage carbon ring sealing assembly and the transmission shaft in the embodiment of the utility model;

[0021] Figure 3 It is a sectional view of the sealing box in the embodiment of the utility model;

[0022] Figure 4 It is an explosion view of the shaft head sealing assembly, the impeller and the transmission shaft in the embodiment of the utility model;

[0023] Figure 5 It is an explosion view of the shaft head sealing assembly in the embodiment of the utility model;

[0024] Figure 6 It is Figure 1 The enlarged view of A part in the embodiment of the utility model;

[0025] Figure 7 It is Figure 1 The enlarged view of B part in the embodiment of the utility model.

[0026] Explanation of reference signs: 1, casing; 11, impeller; 12, multi-stage carbon ring sealing assembly; 13, sealing box; 131, mounting ring groove; 15, shaft sleeve; 16, shaft head sealing assembly; 17, sealing ring pad; 171, clamping jaw piece; 18, compression end cover; 181, groove; 2, transmission shaft; 3, damping support; 31, upper support; 32, lower support; 33, spring damper; 34, limiting support assembly; 35, threaded pull rod; 36, support plate; 4, transmission group; 5, motor. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model will be described in detail below with reference to the drawings.

[0028] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower" and the like is based on the orientation or position relationship when the product is normally used.

[0029] The following will be described in detail with reference to the drawings Figures 1-7 The application will be further described in detail.

[0030] The utility model embodiment provides a kind of special fan of chemical fiber industry, refer to Figure 1 With Figure 2 , special fan of chemical fiber industry includes casing 1, transmission shaft 2, damping support 3, transmission group 4 and motor 5.Casing 1, transmission shaft 2, transmission group 4 and motor 5 are all installed on damping support 3, transmission group 4 is located between casing 1 and motor 5, transmission shaft 2 is rotatably connected with transmission group 4, both ends of transmission shaft 2 are protruding from transmission group 4, and motor 5 is connected with one end of transmission shaft 2 for driving transmission shaft 2 to rotate.Casing 1 is rotatably provided with impeller 11 inside, and the end of transmission shaft 2 away from motor 5 is inserted into casing 1 and is keyed connected with impeller 11 for driving impeller 11 to rotate.Casing 1 and transmission shaft 2 connection place are equipped with multi-stage carbon ring sealing assembly 12, and multi-stage carbon ring sealing assembly 12 is suitable for forming multiple seals at the connection place of casing 1 and transmission shaft 2.

[0031] Refer to Figure 2 With Figure 3The multi-stage carbon ring sealing assembly 12 is arranged on the side of the casing 1 close to the transmission group 4, and comprises a sealing box 13 and a plurality of sealing carbon rings (not shown in the figure). The sealing box 13 is connected to the casing 1 by bolts, and a sealing gasket (not shown in the figure) is arranged on the side of the sealing box 13 in contact with the casing 1, thereby ensuring the sealing of the connection between the sealing box 13 and the casing 1. An installation ring groove 131 is formed in the sealing box 13, and the outer peripheral wall of the sealing carbon ring is inserted into the installation ring groove 131. The number of the installation ring grooves 131 is consistent with and corresponds to the number of the sealing carbon rings, so that the sealing carbon ring is more stable after being installed in the sealing box 13. The end of the transmission shaft 2 connected to the impeller 11 penetrates through the sealing box 13. The plurality of sealing carbon rings are arranged in the axial direction of the transmission shaft 2, and are all sleeved on the transmission shaft 2 and tightly attached to the transmission shaft 2. The outer peripheral wall of each of the plurality of sealing carbon rings is tightly attached to the inner peripheral wall of the sealing box 13, so that a plurality of seals are formed, the sealing effect is improved, and gas is less likely to leak from there.

[0032] In the embodiment, the impeller 11 is preferably a backward type impeller 11, which can effectively avoid the generation of airflow separation and vortex, so as to ensure stable high-pressure output and lower energy loss. The side of the impeller 11 close to the transmission group 4 is fixedly provided with a shaft sleeve 15 by rivets, and the central axis of the shaft sleeve 15 coincides with the central axis of the impeller 11. The transmission shaft 2 is inserted into the shaft sleeve 15 and located inside the impeller 11, and the transmission shaft 2 is key-connected to the shaft sleeve 15 to drive the impeller 11 to rotate.

[0033] Referring to Figure 4 and Figure 5 The end of the transmission shaft 2 located inside the impeller 11 is provided with a shaft head sealing assembly 16, which is suitable for sealing the gap between the shaft sleeve 15 and the transmission shaft 2, and prevents the leakage of nitrogen gas and other gases along the inner hole of the shaft sleeve 15, thereby ensuring the sealing of the fan system during the chemical fiber production process. In addition, after the inner hole of the shaft sleeve 15 is sealed, the gas can be discharged after doing work according to the specified path through the impeller 11, so as to ensure the stable high-pressure output of the gas.

[0034] Referring to Figure 4 and Figure 5 The shaft head sealing assembly 16 comprises a sealing ring gasket 17 and a pressing end cover 18. The sealing ring gasket 17 is located on the side of the shaft sleeve 15 away from the transmission group 4 and is sleeved on the transmission shaft 2. The outer diameter of the sealing ring gasket 17 is greater than the inner diameter of the shaft sleeve 15, and the sealing ring gasket 17 is tightly attached to the transmission shaft 2. The pressing end cover 18 is sleeved on the end of the transmission shaft 2 and is threadedly connected to the transmission shaft 2. The opposite sides of the sealing ring gasket 17 are respectively abutted against the pressing end cover 18 and the shaft sleeve 15. The sealing ring gasket 17 can be pressed against the shaft sleeve 15 by rotating the pressing end cover 18, thereby sealing the inner hole of the shaft sleeve 15.

[0035] The outer peripheral wall of the pressing end cover 18 is provided with a groove 181 penetrating the pressing end cover 18 along the axial direction of the transmission shaft 2, and the outer peripheral wall of the sealing ring pad 17 is provided with a clamping jaw 171. After the pressing end cover 18 is installed in place, the clamping jaw 171 can be bent to extend obliquely and be inserted into the groove 181. In this way, the clamping jaw 171 can limit the rotation of the pressing end cover 18, so that the pressing end cover 18 is not easy to loosen during the rotation of the impeller 11.

[0036] In combination Figure 1 With reference to Figure 6 With Figure 7 The damping support 3 includes an upper support 31, a lower support 32, and a spring damper 33 (which is a mechanical part known in the prior art, and thus will not be described in detail). The casing 1 is detachably connected to the upper support 31 by bolts. When it is necessary to overhaul or replace parts inside the fan, an operator can conveniently separate the fan casing 1 from the support, thereby improving the maintenance efficiency and reducing the maintenance cost. The motor 5 and the transmission group 4 are both mounted on the top of the upper support 31, and the two sides of the spring damper are connected to the upper support 31 and the lower support 32, respectively. The spring damper 33 is provided in a plurality of pieces, and the plurality of spring dampers 33 are distributed along the circumferential direction of the lower support 32. The above arrangement can well absorb the vibration generated during the operation of the fan, thereby reducing the influence of the vibration on the fan itself and the surrounding equipment.

[0037] In addition, a limiting support assembly 34 is detachably arranged between the upper support 31 and the lower support 32. The two sides of the limiting support assembly 34 abut against the upper support 31 and the lower support 32, respectively, and are suitable for preventing the upper support 31 from shaking relative to the lower support 32. The limiting support assembly 34 is provided in a plurality of pieces, and the plurality of limiting support assemblies 34 are distributed along the circumferential direction of the lower support 32. Hereinafter, one limiting support assembly 34 will be described as an example.

[0038] In combination Figure 1 With reference to Figure 6 With Figure 7 The upper support 31 and the lower support 32 are both outwardly bent at one side thereof. The limiting support assembly 34 includes a threaded pull rod 35 and a support plate 36. The two ends of the threaded pull rod 35 pass through the flanges of the upper support 31 and the lower support 32, respectively, and are connected to the upper support 31 and the lower support 32 by connecting nuts. In this embodiment, the support plate 36 is preferably a U-shaped plate laid on one side, i.e., the two side plates of the support plate 36 abut against the upper support 31 and the lower support 32, respectively. The two side plates of the support plate 36 are both provided with a slot, and the portion of the threaded pull rod 35 located between the upper support 31 and the lower support 32 is inserted into the slot. In this way, the stability of the support plate 36 after installation and the convenience during disassembly are improved.

[0039] When the fan is moved, the support plate 36 is inserted between the upper support 31 and the lower support 32, and the threaded pull rod 35 is inserted into the slot, at this time, the direction in which the upper support 31 and the lower support 32 are close to each other is limited by the support plate 36; the direction in which the upper support 31 and the lower support 32 are away from each other is limited by the connecting nuts at both ends of the threaded pull rod 35, so that the upper support 31 is not easy to shake relative to the lower support 32 during movement, thereby improving the safety when the fan is moved.

[0040] When the spring shock absorber 33 is driven to play a damping role, the support plate 36 is removed, and the threaded pull rod 35 can be selected not to be removed, thereby improving the safety of the upper support 31 and the lower support 32 during shaking.

[0041] The implementation principle of the fan special for the chemical fiber industry in the embodiment of the application is as follows: the connection between the casing 1 and the transmission shaft 2 realizes multi-stage carbon ring mechanical sealing through the multi-stage carbon ring sealing assembly 12, the front part of the impeller 11 is sealed by the shaft head sealing assembly 16, and the problem of leakage of nitrogen and other gases along the inner hole of the shaft sleeve 15 is prevented, so that the sealing performance of the fan system in the chemical fiber production process is ensured; in addition, the fan adopts a double-layer damping support 3, which can well absorb the vibration generated when the fan operates, reduces the influence of the vibration on the fan itself and surrounding equipment, improves the operation stability of the fan and the service life of the equipment, and in addition, the damping support 3 can be directly placed on the platform of the factory building without foundation bolts, which not only simplifies the installation process of the fan and improves the installation efficiency, but also enhances the adaptability of the fan in different factory building environments, reduces the installation cost and the requirement for the infrastructure of the factory building.

[0042] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present disclosure.

Claims

1. A fan specially used in the chemical fiber industry, characterized by: The invention comprises a casing (1) and a transmission shaft (2), wherein an impeller (11) is rotatably provided inside the casing (1), one end of the transmission shaft (2) is inserted into the casing (1) and connected to the impeller (11), and the other end of the transmission shaft (2) is suitable for being connected to a motor (5), a multi-stage carbon ring sealing assembly (12) is provided at the connection between the casing (1) and the transmission shaft (2), and the multi-stage carbon ring sealing assembly (12) is suitable for forming a multi-channel seal at the connection between the casing (1) and the transmission shaft (2), one end of the transmission shaft (2) connected to the impeller (11) is inserted into the transmission shaft (2), and a shaft head sealing assembly (16) is provided at the end of the transmission shaft (2) located inside the impeller (11), and the shaft head sealing assembly (16) is suitable for sealing the connection between the impeller (11) and the transmission shaft (2).

2. The fan for chemical fiber industry according to claim 1, characterized in that: The impeller (11) is a backward impeller (11).

3. The fan dedicated to the chemical fiber industry according to claim 1, characterized in that: The multi-stage carbon ring sealing assembly (12) comprises a sealing box (13), the sealing box (13) being connected to the housing (1), the sealing box (13) being sleeved on the transmission shaft (2), a plurality of sealing carbon rings being arranged inside the sealing box (13), the plurality of sealing carbon rings being spaced apart along the axial direction of the transmission shaft (2), the plurality of sealing carbon rings being sleeved on the transmission shaft (2) and being in close contact with the transmission shaft (2), and the outer peripheral walls of the plurality of sealing carbon rings being in close contact with the inner peripheral wall of the sealing box (13).

4. The fan dedicated to the chemical fiber industry according to claim 3, characterized in that: The sealing box (13) is provided with an installation ring groove (131) inside, and the outer peripheral wall of the sealing carbon ring is inserted into the installation ring groove (131). The number of the installation ring grooves (131) is consistent with the number of the sealing carbon rings and corresponds one to one.

5. The fan dedicated to the chemical fiber industry according to claim 4, characterized in that: The impeller (11) is fixedly provided with a shaft sleeve (15), the transmission shaft (2) is inserted into the shaft sleeve (15) and key-connected to the shaft sleeve (15), the shaft head sealing assembly (16) includes a sealing ring gasket (17) and a pressing end cover (18), the sealing ring gasket (17) is located on the side of the shaft sleeve (15) away from the multi-stage carbon ring sealing assembly (12) and is sleeved on the transmission shaft (2), the sealing ring gasket (17) is tightly fitted with the transmission shaft (2), the pressing end cover (18) is sleeved on the transmission shaft (2), and the opposite sides of the sealing ring gasket (17) are respectively pressed against the pressing end cover (18) and the shaft sleeve (15).

6. The fan dedicated to the chemical fiber industry according to claim 5, characterized in that: A groove (181) is provided on the outer peripheral wall of the clamping end cover (18), and the groove (181) penetrates the clamping end cover (18) along the axial direction of the transmission shaft (2). A claw piece (171) is provided on the outer peripheral wall of the sealing ring gasket (17), and the claw piece (171) extends obliquely and is inserted into the groove (181).

7. The fan dedicated to the chemical fiber industry according to claim 5, characterized in that: The invention also includes a vibration-damping bracket (3), wherein the vibration-damping bracket (3) includes an upper bracket (31), a lower bracket (32) and a spring vibration damper (33), wherein the housing (1) is detachably connected to the upper bracket (31), and the two sides of the spring vibration damper (33) are respectively connected to the upper bracket (31) and the lower bracket (32).

8. The fan dedicated to the chemical fiber industry according to claim 7, characterized in that: A position-limiting support assembly (34) is detachably provided between the upper bracket (31) and the lower bracket (32), and two sides of the position-limiting support assembly (34) are respectively in contact with the upper bracket (31) and the lower bracket (32). The position-limiting support assembly (34) is suitable for driving the upper bracket (31) to prevent it from shaking relative to the lower bracket (32).

9. The fan dedicated to the chemical fiber industry according to claim 8, characterized in that: The position limiting support assembly (34) includes a threaded pull rod (35) and a support plate (36), the two ends of the threaded pull rod (35) respectively pass through the upper bracket (31) and the lower bracket (32), the two ends of the threaded pull rod (35) are respectively threadedly installed with connecting nuts, the support plate (36) is located between the upper bracket (31) and the lower bracket (32), the two sides of the support plate (36) respectively abut the upper bracket (31) and the lower bracket (32), a slot is provided on the outer wall of one side of the support plate (36), and the part of the threaded pull rod (35) located between the upper bracket (31) and the lower bracket (32) is inserted into the slot.

10. The fan dedicated to the chemical fiber industry according to claim 9, characterized in that: A plurality of the spring dampers (33) and the position-limiting support assemblies (34) are provided, and the plurality of the spring dampers (33) and the position-limiting support assemblies (34) are distributed at intervals along the circumference of the lower bracket (32).

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