Motor shaft hole sealing structure, shaft sealing motor and flue induced draft fan thereof
By using a sealing body on the rotary shaft of the flue induced fan motor, the motor is blocked and frozen due to poor bearing sealing, and static and dynamic sealing of the rotary shaft hole is achieved, extending the service life and improving maintenance convenience.
Patent Information
- Application Number
- CN202421500857.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-06-28
AI Technical Summary
Due to the harsh use environment of the flue induced fan, if the bearing is not sealed well, it is prone to blockage and damage, which leads to frequent maintenance or repairs by users, and inconvenient maintenance in bad weather, and may even cause disability accidents.
A motor shaft hole sealing structure is provided, which is wrapped around the rotating shaft of the motor through a sealing body, allowing the sealing body to rotate relative to the motor housing and/or the rotating shaft to realize static and dynamic sealing of the rotating shaft hole of the motor to prevent smoke from entering.
It effectively avoids the blockage and freezing of the motor shaft, extends the service life of the motor, improves the convenience of the user's maintenance, and reduces maintenance risks.
Smart Images
Figure CN222910758U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flue induced draft fans, in particular to a motor shaft hole sealing structure, a shaft-sealed motor and a flue induced draft fan thereof. Background Art
[0002] Due to the harsh use environment of the motor of the flue induced draft fan, if its bearing seal is not good, problems such as stalling and damage are likely to occur, resulting in frequent maintenance, repair or replacement by users. And the induced draft fan is usually installed at the end of the flue, and it is necessary to climb a ladder to perform maintenance and replacement, which is time-consuming and laborious. Especially in bad weather, it will cause great inconvenience to users and even lead to disability accidents. For coal-fired users who rely on the induced draft fan, if the induced draft fan fails unconsciously at night, a tragedy of coal smoke poisoning will occur. Moreover, the energy and material consumption caused by replacement (reproduction) is also not conducive to energy conservation and environmental protection.
[0003] The main reasons for the stalling and damage of the motor are as follows: Flue gas will invade through the gap between the bearing end cover of the motor and the rotating shaft hole of the rotating shaft, and then cause the lubricating grease in the roller of the bearing and its lubricating oil passage to corrode and fail, resulting in stalling. In cold weather, the rotating shaft is prone to freezing, causing stalling. After stalling, if the designed power of the motor is small and the starting torque is not large, it is easy to cause the stator coil current of the motor to exceed the rated working current and burn out. Therefore, preventing the invasion and corrosion of flue gas (flue gas is a mixture of gas and dust, with complex components. The gas includes water vapor, sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrocarbons, nitrogen oxides, etc., and the dust includes ash of fuel, coal particles, oil droplets and high-temperature cracking products, etc.) on the bearing roller and its lubricating grease is the primary problem, and then taking into account avoiding stalling caused by the condensation of rain, snow and frost (mainly the moisture in the flue gas) between the rotating shaft and the motor end cover in cold weather environment.
[0004] The anti-stalling methods of induced draft fans are mainly divided into two types: one is to actively reduce the entry of flue gas through a driving mechanism, and the other is to passively reduce the entry of flue gas by improving the sealing performance. The former is as Figure 10 shown. Usually, one or more blades 15 that rotate with the rotating shaft 3 are arranged on the rotating shaft 3 of the motor 2 to drive the flue gas in the flue, in an attempt to reduce the entry of flue gas into the gap between the rotating shaft hole 11 of the end cover 8 of the motor 2 and the rotating shaft 3 during the operation of the induced draft fan, and then invade the inside of the bearing 10 of the motor. However, for the blades 15 of such a device, it is still inevitable that part of the flue gas will impact and penetrate into the gap of the rotating shaft hole. Moreover, when the induced draft fan stops working, the rotational speed of the induced draft fan motor is zero, and the blades 15 stop rotating and lose the driving effect, so it is impossible to avoid the invasion of flue gas rising by natural draft force into the gap of the rotating shaft hole 11. The latter is as Figure 11As shown in the figure, a smoke blocking cover 16 is provided between the impeller 4 at the end of the rotating shaft 3 of the induced draft fan and the rotating shaft hole 11 of the end cover 8. A felt washer 17 is provided on the rotating shaft 3 of the motor 2. The felt washer 17 blocks the rotating shaft hole of the induced draft fan motor rotating shaft of the smoke blocking cover to prevent the flue gas from invading the gap of the rotating shaft hole of the motor end cover. Although the smoke blocking cover 16 and the felt washer 17 have a certain blocking effect, the flue gas will still pass through the shaft hole of the smoke blocking cover 16, the shaft hole of the felt washer 17 or rise to the gap between the rotating shaft hole 11 of the end cover 8 and the rotating shaft 3 by bypassing the edge of the felt washer 17. Therefore, in essence, it only extends the flue gas path and makes the flue gas reach the bearing roller and its oil passage gap with a certain delay. This does not prevent the flue gas from carrying moisture to invade the bearing. Moreover, when the temperature is below zero degrees Celsius, the mixture of moisture, oil and dust particles in the flue gas will freeze the motor rotor rotating shaft, the felt washer 17 (the wet felt washer 17 will freeze into a solid state under the infiltration of the flue gas moisture) together with the smoke blocking cover 16 as a whole, sealing the rotating shaft hole of the smoke blocking cover 16 to form a leak-proof funnel (the smoke blocking cover 16 becomes a receiving plate). This will prevent the rainwater from above the smoke blocking cover 16 from flowing through the rotating shaft hole of the smoke blocking cover 16, resulting in more rainwater and other impurities accumulating at the rotating shaft hole of the smoke blocking cover 16, forming a "barrier lake". Under the environmental factors of alternating heat and cold, the result can be imagined. The rotating shaft and the smoke blocking cover 16 will be fixed together due to the freezing of the felt washer 17, causing the rotating shaft to jam. Utility Model Content
[0005] The purpose of the present utility model is to solve the above technical problems and provide a motor shaft hole sealing structure, a shaft-sealed motor and its flue induced draft fan. The sealing body seals the rotating shaft hole of the motor and allows relative rotation between it and the rotating shaft, realizing static and dynamic sealing of the rotating shaft hole of the motor, so that whether the motor is working or not, the flue gas cannot enter the motor interior through the rotating shaft hole, avoiding the jamming and freezing of the motor rotating shaft.
[0006] To achieve the above purpose, the present utility model provides the following solution: The present utility model discloses a motor shaft hole sealing structure, including a sealing body for sealing the rotating shaft hole of the motor. The sealing body airtightly wraps around the rotating shaft of the motor, and the sealing body can rotate relative to the outer shell of the motor and / or the rotating shaft.
[0007] Preferably, the sealing body includes a filler filled in the base of the end cover of the motor. The rotating shaft hole is located on the base. A bearing or a rotating shaft for the rotating shaft to be rotatably connected is provided in the base. The filler in the base is located between the bearing and the rotating shaft hole or between the shaft sleeve and the rotating shaft hole in the base.
[0008] Preferably, the seal body includes a stuffing box having a stuffing cavity and stuffing filled in the stuffing cavity. Both ends of the stuffing box are respectively provided with a stuffing port and a rotating hole communicating with the stuffing cavity. The stuffing port faces the outer wall of the base of the end cover of the motor. The stuffing box is fixedly connected to the outer wall of the base of the end cover of the motor or fixedly connected to the rotating shaft. The rotating shaft hole is within the coverage of the stuffing port, and the rotating hole is sleeved on the rotating shaft.
[0009] Preferably, the seal body includes stuffing and a stuffing box having a stuffing cavity. The stuffing is filled both in the base of the end cover of the motor and in the stuffing cavity. The rotating shaft hole is located on the base. A bearing or a rotating shaft for rotatably connecting the rotating shaft is provided in the base. The stuffing in the base is located between the bearing and the rotating shaft hole or between the shaft sleeve and the rotating shaft hole in the base. Both ends of the stuffing box are respectively provided with a stuffing port and a rotating hole communicating with the stuffing cavity. The stuffing port faces the outer wall of the base of the end cover of the motor. The stuffing box is fixedly connected to the outer wall of the base of the end cover of the motor or fixedly connected to the rotating shaft. The rotating shaft hole is within the coverage of the stuffing port, and the rotating hole is sleeved on the rotating shaft.
[0010] Preferably, the stuffing is a hydrophobic and lipophilic fibrous material.
[0011] Preferably, the stuffing includes a hydrophobic and lipophilic fibrous material, and the fibrous material is infiltrated with an airtight oil.
[0012] Preferably, the top end of the stuffing box where the rotating hole is provided is provided with an inner groove recessed into the stuffing cavity. There is a spacing between the side wall of the inner groove and the side wall of the stuffing cavity, and the rotating hole is located at the bottom of the inner groove.
[0013] Also disclosed is a shaft-sealed motor, including a motor and the above-mentioned motor shaft hole sealing structure. The seal body of the motor shaft hole sealing structure is airtightly wrapped around the rotating shaft of the motor. The seal body can rotate relative to the outer shell of the motor and / or the rotating shaft, and the seal body seals the rotating shaft hole of the motor.
[0014] Preferably, the motor has an end cover. A base is provided on the end cover. An installation port is provided at the top end of the base facing the inside of the motor. A bearing or a shaft sleeve for rotatably connecting with the rotating shaft is installed in the installation port. The rotating shaft hole is provided at the top end of the base facing the outside of the motor.
[0015] Also disclosed is a flue induced draft fan, which includes a mounting frame and the above-mentioned shaft-sealed motor. The motor of the shaft-sealed motor is installed in the mounting frame. The motor is close to the top end of the mounting frame. A rain shield is provided at the top end of the mounting frame. A mounting seat is provided at the bottom end of the mounting frame. An air inlet for communicating with the flue is provided on the mounting seat. An impeller close to the air inlet is fixedly connected to the rotating shaft of the motor.
[0016] The utility model has achieved the following technical effects compared with the prior art:
[0017] 1. In the motor shaft hole sealing structure of the utility model, the sealing body wraps around the rotating shaft and allows relative rotation between the two. At the same time, the sealing body seals the shaft hole of the motor, realizing static and dynamic sealing of the shaft hole. Whether the motor is working or not, flue gas cannot enter the motor interior between the shaft hole and the rotating shaft, avoiding the blocking and freezing of the motor rotating shaft.
[0018] 2. In the shaft-sealed motor of the utility model, the shaft-sealed motor adopts a motor shaft hole sealing structure. The sealing body wraps around the rotating shaft and allows relative rotation between the two. At the same time, the sealing body seals the shaft hole of the motor, realizing static and dynamic sealing of the shaft hole. Whether the motor is working or not, flue gas cannot enter the motor interior between the shaft hole and the rotating shaft, avoiding the blocking and freezing of the motor rotating shaft and prolonging the service life of the motor.
[0019] 3. In the flue induced draft fan of the utility model, a shaft-sealed motor is adopted. The sealing body wraps around the rotating shaft and allows relative rotation between the two. At the same time, the sealing body seals the shaft hole of the motor, realizing static and dynamic sealing of the shaft hole. Whether the induced draft fan is working or not, flue gas cannot enter the motor interior between the shaft hole and the rotating shaft, avoiding the blocking and freezing of the motor rotating shaft and prolonging the service life of the flue induced draft fan. Description of the Drawings
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0021] Figure 1 It is a structural schematic diagram of a flue induced draft fan (with a sealing body outside the motor);
[0022] Figure 2 It is a cross-sectional view of a flue induced draft fan (with a sealing body outside the motor);
[0023] Figure 3It is a cross-sectional view of a flue gas induced draft fan (sealing bodies are provided both inside and outside the motor);
[0024] Figure 4 It is a schematic structural diagram of a flue gas induced draft fan (a sealing body is provided inside the motor);
[0025] Figure 5 It is a cross-sectional view of a flue gas induced draft fan (a sealing body is provided inside the motor);
[0026] Figure 6 It is a schematic structural diagram of a flue gas induced draft fan (a sealing body with an inner groove is provided outside the motor);
[0027] Figure 7 It is a cross-sectional view of a flue gas induced draft fan (a sealing body with an inner groove is provided outside the motor);
[0028] Figure 8 It is a cross-sectional view of a flue gas induced draft fan (sealing bodies are provided both inside and outside the motor, and the outer sealing body has an inner groove);
[0029] Figure 9 It is a cross-sectional view of a flue gas induced draft fan (a sealing body is provided outside the motor, and the stuffing box is fixed to the rotating shaft);
[0030] Figure 10 It is a schematic structural diagram of a traditional flue gas induced draft fan (with blades);
[0031] Figure 11 It is a schematic structural diagram of a traditional flue gas induced draft fan (with a smoke blocking cover).
[0032] Explanation of reference numerals: 1. Mounting frame; 2. Motor; 3. Rotating shaft; 4. Impeller; 5. Stuffing box; 6. Packing; 7. Air inlet; 8. End cover; 9. Base; 10. Bearing; 11. Rotating shaft hole; 12. Rotating hole; 13. Inner groove; 14. Oil storage area; 15. Blade; 16. Smoke blocking cover; 17. Felt washer; 18. Rain shield; 19. Mounting seat. Detailed implementation manners
[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0034] Embodiment 1
[0035] This embodiment provides a sealing structure for the motor shaft hole, as shown in Figures 1 to 9As shown in the figure, it includes a sealing body for sealing the shaft hole 11 of the motor 2. The sealing body is wrapped around the shaft 3 of the motor 2 and can rotate relative to the outer shell of the motor and / or the shaft 3. That is, there are three cases: one is that the sealing body can rotate relative to the outer shell of the motor, but remains relatively stationary with respect to the shaft 3; one is that the sealing body can rotate relative to the shaft 3, but remains relatively stationary with respect to the outer shell of the motor; the other is that the sealing body can rotate relative to both the shaft 3 and the outer shell of the motor. Under the shielding of the sealing body, flue gas cannot enter the interior of the motor 2 through the gap between the shaft hole 11 and the shaft 3, thus solving the problem of flue gas invading the interior of the motor 2, resulting in blockage caused by the corrosion and failure of the rollers of the bearing 10 and the lubricating grease in its lubricating oil passage, as well as blockage caused by the freezing of the shaft 3 due to the moisture in the flue gas or external rain and snow in cold weather, and then ensuring that the motor 2 will not be damaged due to flue gas blockage.
[0036] There are three positional relationships between the sealing body and the motor 2: one is set inside the motor 2 (such as Figure 4 and Figure 5 ), closing the shaft hole 11 inside the motor 2; one is set outside the motor 2, and the outside can be understood as being set on the outer wall of the motor 2 (such as Figure 1 、 Figure 2 、 Figure 6 and Figure 7 ), or it can be understood as not being set on the motor 2, closing the shaft hole 11 outside the motor 2, and it can also be understood as being fixed on the shaft of the motor 2, as shown in Figure 9 ; the other is set both inside and outside the motor 2 (such as Figure 1 、 Figure 3 、 Figure 6 and Figure 8 ), closing the shaft hole 11 both inside and outside the motor 2 at the same time, and the outside can be understood as being set on the outer wall of the motor 2 or not being set on the motor 2.
[0037] For the first positional relationship between the sealing body and the motor 2, in this embodiment, as shown in Figures 1 to 9 , the sealing body includes packing 6, and the packing 6 is set inside the motor 2. Specifically, the packing 6 is filled in the base 9 of the end cover 8 of the motor 2, and the shaft hole 11 is located on the base 9. There is a bearing 10 or a shaft (not shown) in the base. After the shaft 3 extends into the base 9 through the shaft hole 11, the rotational connection with the base 9 is realized through the bearing 10 or the shaft. The packing is located between the bearing 10 and the shaft hole in the base 9 or between the bushing and the shaft hole in the base 9. The packing 6 blocks the entry of flue gas from the shaft hole 11 from the inside of the base 9.
[0038] For the second positional relationship between the sealing body and the motor 2, in this embodiment, asFigures 1 to 9 As shown, the seal body includes a stuffing box 5 and packing 6. A stuffing cavity is provided inside the stuffing box 5. The top end of the stuffing cavity is provided with a stuffing port, and the bottom end is provided with a rotating hole 12. Both the stuffing port and the rotating hole 12 communicate with the stuffing cavity. The packing 6 can be filled into the stuffing cavity through the stuffing port. The stuffing port faces the outer wall of the base 9 of the end cover 8 of the motor 2. The rotating shaft hole 11 is within the coverage of the stuffing port. The rotating hole 12 is sleeved on the rotating shaft 3. The stuffing box 5 can be fixedly connected to the outer wall of the base 9 of the end cover 8 of the motor 2. For example, the stuffing port is fixedly connected to the outer wall of the base 9 to achieve relative rotation between the relative rotating shafts 3. The stuffing box 5 can also be fixedly connected to the rotating shaft 3. For example, the rotating hole 12 is fixedly connected to the rotating shaft 3 to achieve relative rotation between the relative outer casing of the motor 2. At this time, the stuffing port and the outer wall of the base 9 are only hermetically fitted and there is no connection relationship, such as Figure 9 shown. The stuffing port can be connected to the base 9 in a detachable connection manner, which is convenient for replacing the packing 6. In this way, the packing 6 can prevent flue gas from entering the rotating shaft hole 11 from the outside of the motor 2. The stuffing port and the base 9 can be hermetically connected or not hermetically connected.
[0039] For the third positional relationship between the seal body and the motor 2, in this embodiment, such as Figures 1 to 9 As shown, the seal body includes a stuffing box 5 and packing 6. A stuffing cavity is provided inside the stuffing box 5. The top end of the stuffing cavity is provided with a stuffing port, and the bottom end is provided with a rotating hole 12. Both the stuffing port and the rotating hole 12 communicate with the stuffing cavity. The packing 6 can be filled into the stuffing cavity through the stuffing port. The stuffing port faces the outer wall of the base 9 of the end cover 8 of the motor 2. The rotating shaft hole 11 is within the coverage of the stuffing port. The rotating hole 12 is sleeved on the rotating shaft 3. The stuffing box 5 can be fixedly connected to the outer wall of the base 9 of the end cover 8 of the motor 2. For example, the stuffing port is fixedly connected to the outer wall of the base 9 to achieve relative rotation between the relative rotating shafts 3. The stuffing box 5 can also be fixedly connected to the rotating shaft 3. For example, the rotating hole 12 is fixedly connected to the rotating shaft 3 to achieve relative rotation between the relative outer casing of the motor 2. At this time, the stuffing port and the outer wall of the base 9 are only hermetically fitted and there is no connection relationship, such as Figure 9 shown. The stuffing port can be connected to the motor 2 in a detachable connection manner, which is convenient for replacing the packing 6. At the same time, packing 6 is also provided inside the motor 2. Specifically, the packing 6 is filled inside the base 9 of the end cover 8 of the motor 2. The rotating shaft hole 11 is located on the base 9. A bearing 10 or a rotating shaft is provided inside the base. After the rotating shaft 3 extends into the base 9 through the rotating shaft hole 11, the rotating connection with the base 9 is realized through the bearing 10 or the rotating shaft. The packing is located between the bearing 10 inside the base 9 and the rotating shaft hole or between the bushing inside the base 9 and the rotating shaft hole. In this way, the packing 6 can block the entry of flue gas from the rotating shaft hole 11 both inside and outside the motor 2. The stuffing port and the base 9 can be hermetically connected or not hermetically connected.
[0040] In this embodiment, such as Figures 1 to 9As shown, the filler 6 is a hydrophobic and oleophilic fiber material. In addition to ensuring the sealing performance, the hydrophobicity can effectively prevent the moisture from entering the smoke, accelerate the discharge of moisture, and avoid freezing in cold weather. The fiber material can be wound in a rope shape, can be wound in a felt sheet shape, or organized into a cylindrical form. The fiber material and its characteristics are selected according to the specific external environment of the induced draft fan, such as: hydrophobic and oleophilic fibers with good hydrophobic and oleophilic effects or hydrophobic and oleophilic fibers with higher temperature resistance. Fibers with good hydrophobic and oleophilic effects include: polypropylene fibers, and fibers with higher temperature resistance include: carbon fibers, Teflon fibers, etc.
[0041] In this embodiment, Figures 1 to 9 As shown, the filler 6 includes a hydrophobic and oleophilic fiber material, and the fiber material is impregnated with an airtight oil. The airtight oil can be selected from an oil with good fluidity, or an oil with good fluidity and hydrophobicity, or an airtight oil with good fluidity and high temperature resistance and low temperature resistance. The oil can fill the pores of the fiber material, which can further improve the airtightness and hydrophobicity of the filler 6. At the same time, the oil can improve the lubricity and thermal conductivity of the fiber material, reduce the resistance between the filler 6 and the rotating shaft 3, avoid the wear of the filler 6, reduce the temperature rise, and make the filler 6 seal the rotating shaft 3 without pressure, so as to achieve the static and dynamic sealing of the rotating shaft hole 11 without increasing the rotation resistance of the rotating shaft 3. In this way, the motor 2 with low power and low starting torque does not need to worry about the problem of damage due to excessive resistance between the filler 6 and the rotating shaft 3. The fiber material can be wound in a rope shape, can be wound in a felt sheet shape, or organized into a cylindrical form. The fiber material and its characteristics are selected according to the specific external environment of the induced draft fan, such as hydrophobic and oleophilic fibers with good hydrophobic and oleophilic effects or hydrophobic and oleophilic fibers with higher temperature resistance. Fibers with good hydrophobic and oleophilic effects include polypropylene fibers, and fibers with higher temperature resistance include carbon fibers and Teflon fibers.
[0042] Under normal circumstances, the capillary phenomenon principle generated by the gaps between the fiber materials, combined with the lipophilic properties of the fiber materials, can make the airtight oil adsorbed in the fiber materials, and combined with the low fluidity of the airtight oil itself, there is no need to worry that the oil will flow out of the rotating hole 12 of the stuffing box 5. However, as the smoke continues to enter the stuffing box 5, the water vapor in the smoke will dilute the airtight oil, increase the fluidity of the oil, and make free oil appear in the oil. There is a risk that the free oil will flow out of the rotating hole 12. In order to avoid this risk, in this embodiment, if Figures 1 to 9As shown in the figure, the stuffing box 5 is provided with an inner groove 13 at the top of the rotating hole 12. The inner groove 13 is recessed into the stuffing cavity. The rotating hole 12 is located at the bottom of the inner groove 13. There is a spacing between the side wall of the inner groove 13 and the side wall of the stuffing cavity. This setting makes the overall longitudinal sectional view of the stuffing box 5 look like an inverted concave shape. The position of the rotating hole 12 is raised, which reduces the pressure at this point. The oil outside the capillary fiber filaments is more likely to be retained within the fiber tissue. The lowest point at the bottom of the inverted concave character (i.e., the spacing between the side wall of the inner groove 13 and the side wall of the stuffing cavity) can serve as an oil storage area 14. The oil storage area 14 is lower than the rotating hole 12. Just like a "pocket", it can store the free oil in the stuffing cavity of the stuffing box 5 to supply the fiber material to absorb the oil. Using the capillary principle, the oil rises above the rotating hole 12 to achieve the sealing of the rotating hole 12 and the shaft hole 11.
[0043] Embodiment 2
[0044] This embodiment provides a shaft-sealed motor, as Figures 1 to 9 shown, including a motor 2 and the motor shaft hole sealing structure in Embodiment 1. The sealing body of the motor shaft hole sealing structure wraps around the rotating shaft 3 of the motor 2. The sealing body can rotate relative to the outer shell of the motor and / or the rotating shaft 3, and the sealing body seals the shaft hole 11 of the motor 2, thereby preventing flue gas from invading the interior of the motor 2, causing blockage due to corrosion and failure of the lubricating grease in the rollers of the bearing 10 and its lubricating oil passage, and blockage caused by freezing of the rotating shaft 3 due to moisture in the flue gas or external rain and snow in cold weather. Subsequently, it is ensured that the motor 2 will not be damaged due to flue gas blockage. There are three positional relationships between the sealing body and the motor 2: one is set inside the motor 2 to seal the shaft hole 11 inside the motor 2; one is set outside the motor 2 to seal the shaft hole 11 outside the motor 2; the other is set both inside and outside the motor 2 to seal the shaft hole 11 inside and outside the motor 2 simultaneously. The external relationship between the sealing body and the motor 2 can be understood as being set on the outer wall of the motor 2 or as not being set on the motor 2.
[0045] In this embodiment, as Figures 1 to 9As shown in the figure, the motor 2 has an end cover 8. A base 9 is provided on the end cover 8. At the top of the base 9 facing the inside of the motor 2, there is an installation opening. A bearing 10 or a bushing is installed in the installation opening for rotatably connecting with the rotating shaft 3. At the top of the base 9 facing the outside of the motor 2, there is a rotating shaft hole 11. The positional relationship between the first sealing body and the motor 2: The sealing body includes packing 6. The packing 6 is arranged in the base 9 and fills the space between the bearing 10 and the rotating shaft hole 11, or fills the space between the bushing and the rotating shaft hole 11. The positional relationship between the second sealing body and the motor 2: The sealing body includes a stuffing box 5 and packing 6. The stuffing opening of the stuffing box 5 is sealingly fixed outside the base 9. The stuffing opening can be selectively detachably connected to the base 9 to facilitate the replacement of the packing 6. The positional relationship between the third sealing body and the motor 2: The sealing body includes a stuffing box 5 and packing 6. The stuffing opening of the stuffing box 5 is sealingly fixed outside the base 9. At the same time, packing 6 is also provided inside the base 9. The packing 6 fills the space between the bearing 10 and the rotating shaft hole 11, or fills the space between the bushing and the rotating shaft hole 11.
[0046] Embodiment 3
[0047] This embodiment provides a flue gas induced draft fan, as Figures 1 to 9 shown, which includes a mounting frame 1 and the shaft-sealed motor in Embodiment 2. The motor 2 of the shaft-sealed motor is installed in the mounting frame 1, and the motor 2 is close to the top of the mounting frame 1. A rain shield 18 is provided at the top of the mounting frame 1, and a mounting seat 19 is provided at the bottom of the mounting frame 1. An air inlet 7 is provided on the mounting seat 19. The air inlet 7 is used to communicate with the flue. An impeller 4 close to the air inlet 7 is fixedly connected to the rotating shaft 3 of the motor 2 for driving the flue gas in the flue, etc. The flue gas can enter the air inlet 7 from the flue and then be discharged from the mounting frame 1. Under the sealing of the sealing body, whether the motor 2 of the induced draft fan works or not, the flue gas cannot enter the inside of the motor 2 through the rotating shaft hole 11, causing the motor to be blocked and frozen. There are three positional relationships between the sealing body and the motor 2: One is arranged inside the motor 2 to seal the rotating shaft hole 11 inside the motor 2; one is arranged outside the motor 2 to seal the rotating shaft hole 11 outside the motor 2; the other is arranged both inside and outside the motor 2 to seal the rotating shaft hole 11 inside and outside the motor 2 at the same time. The external relationship between the sealing body and the motor 2 can be understood as being arranged on the outer wall of the motor 2, or can be understood as not being arranged on the motor 2, such as being directly fixed on the frame body of the mounting frame 1.
[0048] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.
Claims
1. A motor shaft hole sealing structure, characterized in that: It comprises a sealing body for sealing the shaft hole of the motor, the sealing body is airtightly wrapped on the shaft of the motor, the sealing body can rotate relatively to the housing of the motor and / or the shaft, and the sealing body comprises a filler, which is a hydrophobic and oleophilic fiber material.
2. A motor shaft hole sealing structure according to claim 1, characterized in that: The sealing body includes a filler filled in the base of the end cover of the motor, the shaft hole is located on the base, a bearing or a shaft for rotationally connecting the shaft is provided in the base, and the filler in the base is located between the bearing in the base and the shaft hole or between the sleeve and the shaft hole.
3. A motor shaft hole sealing structure according to claim 1, characterized in that: The sealing body includes a stuffing box having a stuffing cavity and stuffing filled in the stuffing cavity, and two ends of the stuffing box are respectively provided with a stuffing port and a rotating hole connected to the stuffing cavity, the stuffing port faces the base outer wall of the end cover of the motor, the stuffing box is fixedly connected to the base outer wall of the end cover of the motor or fixedly connected to the rotating shaft, the rotating shaft hole is located within the coverage range of the stuffing port, and the rotating hole is sleeved on the rotating shaft.
4. A motor shaft hole sealing structure according to claim 1, characterized in that: The sealing body includes a packing and a stuffing box with a packing cavity. The base of the end cover of the motor and the packing cavity are both filled with the packing. The rotating shaft hole is located on the base. The base is provided with a bearing or a rotating shaft for rotationally connecting the rotating shaft. The packing in the base is located between the bearing and the rotating shaft hole in the base or between the sleeve and the rotating shaft hole. Both ends of the stuffing box are respectively provided with a packing port and a rotating hole connected to the packing cavity. The packing port faces the outer wall of the base of the end cover of the motor. The stuffing box is fixedly connected to the outer wall of the base of the end cover of the motor or to the rotating shaft. The rotating shaft hole is located within the coverage range of the packing port, and the rotating hole is sleeved on the rotating shaft.
5. The motor shaft hole sealing structure according to claim 1, characterized in that: The fiber material is impregnated with an airtight oil.
6. A motor shaft hole sealing structure according to claim 5, characterized in that: The stuffing box is provided with an inner groove sunken into the stuffing cavity at the top end of the rotating hole, a distance is provided between the side wall of the inner groove and the side wall of the stuffing cavity, and the rotating hole is located at the bottom of the inner groove.
7. A shaft sealed motor, characterized in that: It comprises a motor and a motor shaft hole sealing structure as described in any one of claims 1 to 6, wherein the sealing body of the motor shaft hole sealing structure is airtightly wrapped on the rotating shaft of the motor, the sealing body can rotate relatively to the housing of the motor and / or the rotating shaft, and the sealing body seals the rotating shaft hole of the motor.
8. A shaft sealed motor according to claim 7, characterized in that: The motor has an end cover, a base is provided on the end cover, a mounting opening is provided at the top end of the base facing the inside of the motor, a bearing or a sleeve for rotationally connecting with the rotating shaft is installed in the mounting opening, and the rotating shaft hole is provided at the top end of the base facing the outside of the motor.
9. A flue induced draft fan, characterized in that: It comprises a mounting frame and a shaft-sealed motor as described in claim 7 or 8, wherein the motor of the shaft-sealed motor is mounted in the mounting frame, the motor is close to the top of the mounting frame, a rain cover is provided at the top of the mounting frame, a mounting seat is provided at the bottom of the mounting frame, an air duct is provided on the mounting seat for communicating with a flue, and an impeller close to the air duct is fixedly connected to the rotating shaft of the motor.