Fan shell with negative-pressure shaft part air leakage recovery system

Abstract

The utility model relates to the field of machinery, in particular to a fan technology. A fan shell with a negative-pressure shaft air leakage recovery system comprises a fan, the fan comprises an air inlet and a fan shaft, a shaft seal sealing piece is arranged at the joint of the fan shaft and the fan shell, the fan shell is further provided with an air-tight shell with a cavity with an opening in one side, the air-tight shell is called an air exhaust cavity, the air exhaust cavity is connected to the outer side of the fan shell, and the air exhaust cavity is communicated with the air inlet of the fan shaft. The shaft seal sealing piece is arranged in a cavity body of the air exhaust cavity in a sleeved mode. Another shaft seal sealing piece is also arranged at the joint of the air exhaust cavity and the fan shaft; the air exhaust cavity communicates with the air inlet through a pipeline. When gas in the draught fan leaks at the shaft seal sealing piece, the leaked gas is sealed in the air exhaust cavity, the air inlet is in a negative pressure state, the gas leaked into the air exhaust cavity can flow to the air inlet of the draught fan along a pipeline and return to the draught fan again, and therefore the purpose that leaked gas of the shaft portion is recycled by the negative pressure of the air inlet is achieved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, and particularly to fan technology. Background Art

[0002] Fans are a type of machinery for gas compression and gas transportation, and are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, and ventilation and induced draft of boilers and industrial furnaces.

[0003] Among the gases to be ventilated or induced, some industrial gases contain strongly corrosive components or toxic components. Therefore, gas leakage cannot occur during the ventilation and air supply of the fan.

[0004] In the structure of a general fan, a sealing device is provided between the rotating shaft of the fan and the housing of the fan. However, the sealing device cannot guarantee that gas leakage will not occur. Some sealing devices, such as shaft seal seals, require the rotating shaft to enter a high-speed operation state before the sealing performance can reach the optimum, thus giving the possibility of gas leakage inside the fan. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a fan housing with a built-in negative pressure shaft air leakage recovery system to solve at least one of the above technical problems.

[0006] The technical problems solved by the utility model can be realized by adopting the following technical solutions:

[0007] A fan housing with a built-in negative pressure shaft air leakage recovery system includes a fan. The fan includes an air inlet and a fan shaft. A shaft seal seal is provided at the connection between the fan shaft and the fan housing. A housing with a circular opening in the middle is also provided. The housing is sleeved on the connection between the fan shaft and the fan housing. The fan shaft passes through the circular opening. The housing, the fan housing and the fan shaft enclose a sealed cavity, which is called an air extraction cavity.

[0008] A shaft seal is provided between the fan shaft and the housing at the circular opening.

[0009] A pipeline connecting the air inlet and the inner cavity of the air extraction cavity is also provided.

[0010] In the above design, on the side of the fan housing where the shaft seal seal is provided, a housing sleeving the shaft seal seal is also provided. The housing and the fan housing enclose a cavity, which is called an air extraction cavity. The middle of the air extraction cavity has a circular opening. The fan shaft passes through the circular opening. A shaft seal is provided in the circular opening. The beneficial effect is that when gas leakage occurs at the shaft seal seal inside the fan, the leaked gas is enclosed in the air extraction cavity. The setting of the air extraction cavity provides a basis for guiding the gas at the leakage point back to the fan again.

[0011] In the above design, a pipeline is also provided. One end of the pipeline is connected to the inner cavity of the air extraction chamber, and the other end bypasses the fan housing and is connected to the air inlet of the fan. Since the air inlet is in a negative pressure state when the fan is in operation, the gas leaked from the fan into the air extraction chamber can flow along the pipeline to the air inlet of the fan and then return to the fan again, thus achieving the purpose of the negative pressure generated by the air inlet itself to recover the air leakage at the shaft part.

[0012] Further, a rotating disk with blades is arranged on the fan shaft in the air extraction chamber, and the wind direction of the rotating disk faces the shaft seal.

[0013] In the above design, in order to prevent the gas leaked in the air extraction chamber from continuing to leak outside the air extraction chamber through the shaft seal between the air extraction chamber and the fan shaft, a rotating disk with blades is arranged on the fan shaft. When the rotating disk rotates, the blades on it drive the air flow. Since the direction of the air flow faces the shaft seal between the fan shaft and the fan housing, a negative pressure area is formed, allowing the air flow outside the air extraction chamber to flow into the air extraction chamber and the gas in the air extraction chamber to flow into the pipeline (going to the air inlet of the fan). Therefore, this design achieves the purpose of preventing the leaked gas from leaking outside the air extraction chamber.

[0014] Further, the housing of the air extraction chamber is made of 316 stainless steel; heat dissipation fins are arranged on the housing of the air extraction chamber.

[0015] In the above design, the housing of the air extraction chamber is made of 316 stainless steel. Molybdenum is added to 316 stainless steel, so its corrosion resistance is particularly good and it can be used in environments with toxicity and corrosion; the pipeline is made of 316 stainless steel, and both ends of the pipeline are connected to the air extraction chamber and the air inlet through threads respectively.

[0016] In the above design, at the connection between the air extraction chamber and the fan shaft, a shaft seal is provided. When the fan shaft rotates at a high speed, there is friction with the shaft seal, which causes the temperature of the housing of the air extraction chamber to rise. By arranging fins around the housing, the temperature on the housing of the air extraction chamber can be exchanged with the surrounding air through the fins to achieve the purpose of reducing the temperature of the housing of the air extraction chamber. The beneficial effect is to maintain the housing temperature, improve the service life of the workpiece, and thus reduce the use cost.

[0017] Further, a corrosion-resistant composite layer is provided on the inner wall of the pipeline; both ends of the pipeline are detachably connected to the air extraction chamber and the air inlet respectively.

[0018] In the above design, a corrosion-resistant composite layer is provided on the inner wall of the pipeline, and its function is to prevent corrosive and toxic gases from corroding the pipeline. The pipeline is connected to the air inlet and the air extraction chamber by means of threaded connection. The beneficial effect is that the corrosion condition of the pipeline can be inspected by disassembly, which is convenient for timely updating and replacing the pipeline to prevent the leakage of toxic and harmful gases caused by the corrosion of the pipeline.

[0019] Furthermore, at least one section of corrugated pipe is provided in the pipeline.

[0020] In the above design, at least one section of corrugated pipe is provided in the pipeline, and its beneficial effects are to reduce pipeline vibration and noise, and increase the service life of the pipeline.

[0021] Furthermore, a bushing made of soft material is provided on the pipeline, and the length of the bushing is 70-90% of the pipeline length.

[0022] In the above design, the main function of the bushing is to protect the pipeline, reduce pipeline wear, vibration, and noise. As an important component for protecting equipment, the bushing has high flexibility in use and can play multiple roles.

[0023] First of all, the bushing can reduce pipeline wear and vibration, which is particularly important for protecting pipeline joints and can extend the service life of the pipeline.

[0024] Secondly, the bushing can also reduce noise and improve the quality of the working environment.

[0025] Bushings are not sleeved at both ends of the pipeline, which facilitates connection to the air inlet and the air extraction chamber.

[0026] Furthermore, outside the bushing made of soft material, there is also a bushing made of polytetrafluoroethylene material sleeved.

[0027] In the above design, polytetrafluoroethylene has a certain hardness and can play a protective role. It also has good chemical inertness and corrosion resistance, is widely used, and has low cost. Sleeved outside the soft material bushing, it can provide protection for the soft material bushing, and its beneficial effect is also to save manufacturing costs and improve economic benefits.

[0028] Furthermore, an oil film bearing is provided at the annular opening;

[0029] The oil film bearing includes a bearing inner sleeve and a bearing outer sleeve;

[0030] The bearing inner sleeve is sleeved on the fan shaft;

[0031] The bearing outer sleeve is installed on the annular opening of the air extraction chamber.

[0032] In the above design, an oil film bearing is provided on the housing of the air extraction chamber. The friction coefficient of the oil film bearing is extremely small, it can withstand the high-speed rotation of the fan shaft, and the maintenance cost is low. At the same time, the existence of the oil film also plays a role in shaft sealing, preventing the leakage gas in the air extraction chamber from escaping from the air extraction chamber.

[0033] Furthermore, the shaft seal is a packing seal.

[0034] In the above design, a rotating disk with blades is arranged on the fan shaft in the air extraction chamber. After the fan shaft rotates, the rotating disk forms a function of blowing air towards the inside of the fan. Therefore, although the stuffing seal is used for the shaft seal, which has the disadvantages of large leakage and large power consumption loss, these disadvantages will not cause the leakage of toxic and harmful gases to the outside of the air extraction chamber. On the premise that the toxic and harmful gases will not leak out, the advantages of the stuffing seal are highlighted. The beneficial effect of using the stuffing seal is that the structure is simple, the price is cheap, the maintenance is convenient, the use cost is reduced, and economic benefits are generated.

[0035] In the present utility model, an airtight air extraction chamber is sleeved at the shaft seal of the shaft part where toxic and harmful gases are likely to leak and the fan housing, so as to enclose the leaked gas in the air extraction chamber. The air extraction chamber is connected to the air inlet through a pipeline, and then under the action of the negative pressure at the air inlet, the leaked gas is re-guided back to the fan, thereby achieving the purpose of preventing the leakage of toxic and harmful gases. Its beneficial effect is that the anti-leakage structure is simple, the manufacturing cost is low, the maintenance is convenient, and certain economic benefits are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0037] Figure 1 is the external view schematic diagram of the present utility model;

[0038] Figure 2 is the partial schematic diagram of the air extraction chamber;

[0039] Figure 3 is the schematic diagram of the pipeline connection of the present utility model.

[0040] Symbol Description:

[0041] 1. Housing; 2. Air inlet; 3. Fan shaft; 4. Air extraction chamber; 5. Pipeline; 6. Shaft seal; 7. Rotating disk; 8. Fins. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] In order to make the above objects, features, and advantages of the present utility model more understandable, the following will describe the specific embodiments of the present utility model in detail with reference to the drawings in the specification.

[0043] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0044] Secondly, the present utility model will be described in detail in conjunction with the schematic diagrams. When detailing the embodiments of the present utility model, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally out of the general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present utility model herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0045] Furthermore, the so-called "one embodiment" or "embodiment" herein refers to specific features, structures, or characteristics that may be included in at least one implementation manner of the present utility model. The phrase "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is separate or selectively mutually exclusive with other embodiments.

[0046] Referring to Figure 1 、 Figure 2 As shown, the fan housing with a built-in negative pressure shaft part air leakage recovery system includes a fan. The fan includes an air inlet 2 and a fan shaft 3. A shaft seal seal 6 is provided at the connection between the fan shaft 3 and the fan housing. There is also provided a housing 1 with an annular opening in the middle. The housing 1 is sleeved at the connection between the fan shaft 3 and the fan housing. The fan shaft 3 passes through the annular opening. The housing 1, the fan housing, and the fan shaft 3 enclose a sealed cavity, which is called an air extraction cavity 4.

[0047] A shaft seal is provided at the annular opening between the fan shaft 3 and the housing 1.

[0048] There is also provided a pipe 5 connecting the air inlet 2 and the inner cavity of the air extraction cavity 4.

[0049] In this embodiment, on the side of the fan housing where the shaft seal seal 6 is provided, there is also provided a housing 1 sleeving the shaft seal seal 6. The housing 1 and the fan housing enclose a cavity, which is called an air extraction cavity 4. The middle of the air extraction cavity 4 has an annular opening. The fan shaft 3 passes through the annular opening, and a shaft seal is provided in the annular opening. The beneficial effect is that when gas leakage occurs at the shaft seal seal 6 inside the fan, the leaked gas is enclosed in the air extraction cavity 4. The setting of the air extraction cavity 4 provides a basis for guiding the gas at the leakage point back to the fan again.

[0050] In this embodiment, a pipeline 5 is further provided. One end of the pipeline 5 is connected to the inner cavity of the air extraction chamber 4, and the other end bypasses the fan housing and is connected to the air inlet 2 of the fan. Since the air inlet 2 is in a negative pressure state when the fan is in operation, the gas leaked from the fan into the air extraction chamber 4 can flow along the pipeline 5 to the air inlet 2 of the fan and return to the fan again, thus achieving the purpose of recovering the air leakage at the shaft part by the negative pressure of the air inlet 2 itself.

[0051] Refer to Figure 2 As shown, a rotating disk 7 with blades is arranged on the fan shaft 3 in the air extraction chamber 4, and the wind direction of the rotating disk 7 faces the shaft seal 6.

[0052] In this embodiment, in order to prevent the gas leaked in the air extraction chamber 4 from continuing to leak outside the air extraction chamber 4 through the shaft seal 6 between the air extraction chamber 4 and the fan shaft 3, a rotating disk 7 with blades is arranged on the fan shaft 3. When the rotating disk 7 rotates, the blades thereon drive the air flow. Since the direction of the air flow faces the shaft seal 6 between the fan shaft 3 and the fan housing, a negative pressure area is formed, enabling the air flow outside the air extraction chamber 4 to flow into the air extraction chamber 4 and the gas in the air extraction chamber 4 to flow into the pipeline 5 (going to the air inlet 2 of the fan). Therefore, this design achieves the purpose of preventing the leaked gas from leaking outside the air extraction chamber 4.

[0053] Furthermore, the housing 1 of the air extraction chamber 4 is a housing 1 made of 316 stainless steel; heat dissipation fins 8 are arranged on the housing 1 of the air extraction chamber 4.

[0054] In this embodiment, the housing 1 of the air extraction chamber is made of 316 stainless steel. Metal molybdenum is added to 316 stainless steel, so its corrosion resistance is particularly good and it can be used in toxic and corrosive environments; the pipeline 5 is a pipeline 5 made of 316 stainless steel, and both ends of the pipeline 5 are respectively connected to the air extraction chamber 4 and the air inlet 2 by threads.

[0055] In this embodiment, a shaft seal is provided at the connection between the air extraction chamber 4 and the fan shaft 3. When the fan shaft 3 rotates at a high speed, there is friction with the shaft seal, which causes the temperature of the housing 1 of the air extraction chamber 4 to rise. By arranging the fins 8 around the housing 1, the temperature on the housing 1 of the air extraction chamber 4 can be exchanged with the surrounding air through the fins 8 to achieve the purpose of reducing the temperature of the housing 1 of the air extraction chamber 4. The beneficial effect is to maintain the temperature of the housing 1, improve the service life of the workpiece, and thus reduce the use cost.

[0056] Refer to Figure 3 As shown, a corrosion-resistant composite layer is provided on the inner wall of the pipeline 5; both ends of the pipeline 5 are detachably connected to the air extraction chamber 4 and the air inlet 2 respectively.

[0057] In this embodiment, a corrosion-resistant composite layer is provided on the inner wall of the pipeline 5, and its function is to prevent corrosive and toxic gases from corroding the pipeline 5. The pipeline 5 is connected to the air inlet 2 and the air extraction chamber 4 by means of threaded connection. The beneficial effect is that the rust condition of the pipeline 5 can be disassembled and inspected, which is convenient for timely updating and replacing the pipeline 5, and can prevent the leakage of toxic and harmful gases caused by the rust of the pipeline 5.

[0058] Furthermore, at least one section of corrugated pipe is provided in the pipeline 5.

[0059] In this embodiment, at least one section of corrugated pipe is provided in the pipeline 5, and the beneficial effect is that it can reduce the vibration and noise of the pipeline 5 and increase the service life of the pipeline 5.

[0060] Furthermore, a bushing made of soft material is provided on the pipeline 5, and the length of the bushing is 70-90% of the length of the pipeline 5.

[0061] In this embodiment, the main function of the bushing is to protect the pipeline 5, reduce the wear and vibration of the pipeline 5, and reduce the noise. As an important component for protecting equipment, the bushing has high flexibility in use and can play multiple roles.

[0062] First of all, the bushing can reduce the wear and vibration of the pipeline 5, which is particularly important for protecting the connection of the pipeline 5 and can extend the service life of the pipeline 5.

[0063] Secondly, the bushing can also reduce noise and improve the quality of the working environment.

[0064] The two ends of the pipeline 5 are not sleeved with bushings, which is convenient for connecting with the air inlet 2 and the air extraction chamber 4.

[0065] Furthermore, outside the bushing made of soft material, a layer of bushing made of polytetrafluoroethylene material is also sleeved.

[0066] In this embodiment, polytetrafluoroethylene has a certain hardness and can play a protective role. It also has good chemical inertness and corrosion resistance, is widely used, and has a low cost. Being sleeved outside the soft material bushing can provide protection for the soft material bushing. The beneficial effect is also that it can save manufacturing costs and improve economic benefits.

[0067] Furthermore, an oil film bearing is provided at the annular opening;

[0068] The oil film bearing includes a bearing inner sleeve and a bearing outer sleeve;

[0069] The bearing inner sleeve is sleeved on the fan shaft 3;

[0070] The bearing outer sleeve is installed on the annular opening of the air extraction chamber 4.

[0071] In this embodiment, an oil film bearing is provided on the housing 1 of the air extraction chamber 4. The friction coefficient of the oil film bearing is extremely small, and it can withstand the high-speed rotation of the fan shaft 3. The maintenance cost is low. At the same time, the existence of the oil film also plays a role of shaft seal, preventing the leaked gas in the air extraction chamber 4 from escaping from the air extraction chamber 4.

[0072] Furthermore, the shaft seal member adopts a packing seal member.

[0073] In this embodiment, a turntable 7 with blades is provided on the fan shaft 3 in the air extraction chamber 4. After the fan shaft 3 rotates, the turntable 7 forms a function of blowing air towards the inside of the fan. Therefore, although the packing seal adopted by the shaft seal member has the disadvantages of large leakage and large power consumption loss, these disadvantages will not cause the leakage of toxic and harmful gases to the outside of the air extraction chamber 4. On the premise that the toxic and harmful gases will not leak outwards, the advantages of the packing seal member are highlighted. The beneficial effects of adopting the packing seal member are that the structure is simple, the price is cheap, the maintenance is convenient, the use cost is reduced, and economic benefits are generated.

[0074] In addition, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described, that is, those features that are not relevant to the currently considered best mode of implementing the present invention, or those features that are not relevant to the implementation of the present invention.

[0075] It should be understood that in the development process of any actual implementation, such as in any engineering or design project, a large number of specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those ordinary technical personnel who benefit from this disclosure, without excessive experimentation, the development efforts will be a routine work of design, manufacturing and production.

[0076] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A fan housing with a self - negative - pressure shaft part air leakage recovery system, including a fan, the fan includes an air inlet and a fan shaft, and a shaft seal is arranged at the connection between the fan shaft and the fan housing. It is characterized in that: There is also a housing with an annular opening in the middle. The housing is sleeved on the connection between the fan shaft and the fan housing. The fan shaft passes through the annular opening. The housing, the fan housing and the fan shaft enclose a sealed cavity, which is called the air extraction cavity; A shaft seal is arranged at the annular opening between the fan shaft and the housing; There is also a pipeline connecting the air inlet and the inner cavity of the air extraction cavity; At least one section of corrugated pipe is arranged in the pipeline.

2. The blower housing of the self-priming negative-pressure shaft air leakage recovery system according to claim 1, characterized in that, A turntable with blades is arranged on the fan shaft in the air extraction cavity, and the wind direction of the turntable faces the shaft seal.

3. The blower housing of the self-priming negative-pressure shaft air leakage recovery system according to claim 1, characterized in that, The inner wall of the pipeline is provided with a corrosion - resistant composite layer; The two ends of the pipeline are detachably connected to the air extraction cavity and the air inlet respectively.

4. The blower housing of the self - contained negative - pressure shaft air leakage recovery system according to claim 1, characterized in that, A bushing made of soft material is arranged on the pipeline, and the length of the bushing is 70 - 90% of the pipeline length.

5. The blower housing of the self - negative - pressure shaft part air leakage recovery system according to claim 4, characterized in that, Outside the bushing made of soft material, there is also a layer of bushing made of polytetrafluoroethylene material sleeved.

6. The blower housing of the self-priming negative-pressure shaft air leakage recovery system according to claim 1, characterized in that, An oil - film bearing is arranged at the annular opening; The oil - film bearing includes a bearing inner sleeve and a bearing outer sleeve; The bearing inner sleeve is sleeved on the fan shaft; The bearing outer sleeve is installed on the annular opening of the air extraction cavity.

7. The blower housing of the self - contained negative - pressure shaft part air leakage recovery system according to claim 1, characterized in that, The shaft seal uses a packing seal.

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