Circulation fan for sludge treatment and drying

Abstract

The present invention discloses a circulating fan for sludge disposal and drying, comprising a housing, an impeller in the housing, a motor outside the housing, and a rotating shaft connected to the inside and outside of the housing and connected to the impeller and the motor respectively, and the housing is sealed and connected to the air inlet pipe and the air outlet pipe in two directions. In particular, the rotating shaft is sleeved with an integral rotating wind pressure sealing ring close to the outer wall of the housing, the inner end of the wind pressure sealing ring close to the housing matches the clearance of the housing surface, and the outer end away from the housing is set as a trumpet-shaped opening, and more than three independent spoiler blades are distributed on the ring wall inside the opening, and the spoiler blades are formed into an arc surface that guides flow from the outside to the inside along the rotation direction of the rotating shaft, and a plurality of air holes are distributed on the periphery of the inner end. The improved structure of the fan of the present invention is applied, and the wind pressure sealing ring sleeved on the rotating shaft is used to prevent the overflow of odor and reach more than 97%, which effectively improves the factory environment around the fan and improves human comfort and safety.

Description

Technical Field

[0001] The invention relates to a fan with external power and high-pressure airflow transfer, and in particular to an improved fan structure capable of preventing high-pressure and high-temperature odor from overflowing through a shaft gap, and belongs to the field of fan equipment. Background Art

[0002] Sewage treatment plants are important institutions for treating urban wastewater. With the long-term accumulation of sewage treatment technology, the existing sewage treatment process has become very mature. However, the final disposal of the sludge generated during the sewage treatment process is relatively more complicated and difficult.

[0003] The layout structures of pipeline facilities in different sewage and sludge treatment (placement) units are not exactly the same, but they are similar. In order to increase the airflow power at different positions of the pipeline, it is necessary to introduce a fan to increase the power. The general structure of the fan includes a box body, an impeller in the box body, a motor outside the box body, and a rotating shaft that is connected to the impeller and the motor inside and outside the box body, and the box body is sealed and connected to the air inlet and outlet pipes in two directions. In this way, under the high output torque drive of the variable frequency motor, the rotating shaft can drive the impeller in the box body to rotate, increasing the flow power of the gas in the pipeline. Since the power part of the fan is external and the rotating shaft is in a high speed state for most of the time, it is inevitable that a certain gap needs to be maintained between the rotating shaft and the box body.

[0004] It can be seen from the process flow that the malodorous gas in the pipeline is in a state of high temperature, high pressure and high humidity. A considerable amount of biogas will overflow from the gap. The actual treatment site environment is very harsh. Not only does the odor make it difficult for people to breathe normally and unbearable, the moisture can easily cause corrosion to the surface of the equipment outside the pipeline, and the high temperature gas can easily cause accidents such as burns.

[0005] Due to the inherent structural limitations of the fan, the environmental governance of this process section of the sewage (sludge) treatment plant has not achieved satisfactory results for a long time. The optimization and improvement of the fan structure is one of the problems that need to be solved urgently. Summary of the invention

[0006] The purpose of the present invention is to propose a sludge disposal drying circulation fan to solve the problem of preventing the overflow of malodorous gases and improving the factory (workshop) environment.

[0007] The technical solution for achieving the above-mentioned purpose of the present invention is to provide a sludge disposal and drying circulating fan, comprising a casing, an impeller in the casing, a motor outside the casing, and a rotating shaft penetrating inside and outside the casing and connecting the impeller and the motor respectively, and the casing is sealed and connected with the air inlet pipe and the air outlet pipe in two directions, and is characterized in that: the rotating shaft is sleeved with an integral rotating wind pressure sealing ring close to the outer wall of the casing, the inner end of the wind pressure sealing ring close to the casing is matched with the gap of the casing surface, and the outer end away from the casing is set as a trumpet-shaped opening, and more than three independent spoiler blades are distributed on the annular wall inside the opening, and the spoiler blades are formed as an arc surface that diverts flow from the outside to the inside along the rotation direction of the rotating shaft, and a plurality of air holes are distributed on the outer periphery of the inner end.

[0008] The above-mentioned sludge disposal drying circulating fan has a fixedly mounted Teflon anti-oxidation plate between the outer wall of the box body and the wind pressure sealing ring, the inner plane of the Teflon anti-oxidation plate fits the outer wall of the box body, and the outer plane is provided with a groove corresponding to the outer diameter of the inward end on the periphery of the shaft perforation, the inward end matches the gap of the groove, and the periphery of the inward end matches the gap of the outer plane of the Teflon anti-oxidation plate.

[0009] The above-mentioned circulating fan for sludge disposal and drying, further, has an outer plane of the Teflon anti-oxidation plate provided with an annular groove facing the air vents and used for air flow return.

[0010] In the above-mentioned sludge treatment and drying circulating fan, the wind pressure sealing ring is a spliced ​​body separated in half axially, and is assembled into a complete wind pressure sealing ring in one piece through a variety of optional methods.

[0011] The above-mentioned circulating fan for sludge disposal and drying has one or more bearing seats and internally connected bearings provided between the wind pressure sealing ring and the motor, and the rotating shaft is inserted into the bearing for axial positioning and driven to rotate.

[0012] The improved structure of the fan using the present invention has significant advancement: by utilizing the wind pressure sealing ring sleeved on the rotating shaft, an adjustable air pressure closed loop is formed from the periphery to the inside during rotation, and the channel for the overflow of biogas is sealed therein, with an anti-overflow odor rate of more than 97%, which effectively improves the factory environment around the fan and enhances human comfort and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the anti-overflow odor fan of the present invention.

[0014] Figure 2 yes Figure 1 Enlarged schematic diagram of the local structure.

[0015] Figure 3 yes Figure 1 The schematic diagram of the structure of the wind pressure sealing ring in the anti-odor overflow fan is shown from an outward perspective. DETAILED DESCRIPTION

[0016] The specific implementation modes of the present invention will be further described below in conjunction with the accompanying drawings of the embodiments, so that the technical solution of the present invention is easier to understand and grasp, thereby making a clearer definition of the protection scope of the present invention.

[0017] In view of the objective existence of malodorous gas overflow and poor plant environment caused by the external power of traditional fans in sludge disposal (sewage treatment) plants, the designers of this invention are committed to improving the fan structure based on the experience accumulated from long-term maintenance of sludge disposal (sewage treatment) equipment and knowledge related to mechanical manufacturing. On the basis of not affecting the normal rotation of the adjustable shaft speed, an invisible airflow barrier is constructed around the gap where the odor overflows, so as to retain the biogas inside the fan housing to the greatest extent and transport it efficiently from the air inlet pipe to the air outlet pipe. In addition to sludge disposal (sewage treatment), the improved structure of the fan can be widely used in fans with gas overflow in various industries. For fans that have completed the assembly of the whole machine, it is also easy to install and use to achieve the function of preventing gas overflow.

[0018] like Figures 1 to 3 The figure shows the improved structure and partial details of the fan. In order to introduce the innovative features, its basic structure needs to be reiterated, which includes a box 1, an impeller in the box (not shown), a motor outside the box (not shown), and a rotating shaft 2 connected to the impeller and the motor respectively inside and outside the box, and the box is sealed and connected to the air inlet and outlet pipes in two directions. The function of the fan is to directly connect the air inlet and outlet pipes, and the external motor drives the rotating shaft and the built-in impeller to rotate, thereby increasing the air flow power. It is not difficult to understand that the rotating shaft penetrates the side wall of the box, and it is necessary to ensure flexible rotation and not be affected by external resistance to the rotational power. Therefore, the rotating shaft needs to be matched with the side wall of the box on the basis of the axial positioning of the external bearing. This also provides a way for the high-pressure, high-heat and high-humidity odor in the fan box to overflow, causing the overflow of methane under the action of the pressure difference, and the surrounding environment deteriorates. As for the technical means to solve the problem, the shaft 2 is provided with an integrally rotating wind pressure sealing ring 3 close to the outer wall of the box body 1, the inward end 31 of the wind pressure sealing ring 3 close to the box body is matched with the surface gap of the box body, and the outward end 32 away from the box body is set as a trumpet-shaped opening, and more than three independent spoiler blades 33 are distributed on the ring wall inside the opening, and the spoiler blades are formed into an arc surface that guides the flow from the outside to the inside with the rotation direction of the shaft, and a plurality of air holes 34 are distributed on the periphery of the inward end 31.

[0019] As a preferred embodiment shown in the figure, a fixedly mounted Teflon anti-oxidation plate with a hole in the center is provided between the outer wall of the box body 1 and the wind pressure sealing ring 3, and the rotating shaft is connected therein. The inner plane of the Teflon anti-oxidation plate is in contact with the outer wall of the box body. The Teflon anti-oxidation plate is integrally fixed to the outer wall of the box body by using a fastening screw 6 to penetrate from the outside to the inside. The outer plane is provided with a recessed groove 51 corresponding to the outer diameter of the inner end outside the through hole of the rotating shaft. Figure 2 As shown in the bold lines, the outer wall of the box body and the hole wall of the Teflon anti-oxidation plate match the rotating shaft 2 in the gap X1, the inward end 31 matches the sink 51 in the gap X2, and the outer periphery of the inward end matches the outer plane of the Teflon anti-oxidation plate in the gap X3. There is no strict requirement for the consistency of the gap width of each gap match, and the basic value is between 0.5 and 1 mm. It can be seen that when there is no external pressure, the high-pressure airflow in the box will overflow from it.

[0020] Moreover, the fan is provided with one or more bearing seats 4 and bearings 41 connected thereto between the wind pressure sealing ring 3 and the motor, and the rotating shaft 2 is inserted into the bearings to achieve axial positioning with high strength and high linearity.

[0021] In order to clearly understand how the above-outlined technical features are used to solve the technical problem of preventing overflow, before showing the structural features of each part in detail, a simple principle is first explained as follows. The wind pressure sealing ring sleeved on the rotating shaft, as the name implies, uses the sealing effect formed by the high-pressure airflow in a specific direction formed thereby. It mainly involves the following features: 1. It is sleeved integrally with the rotating shaft and rotates with it; 2. It is equipped with spoiler blades, which can rotate with the rotating shaft to form an airflow from the outward end to the inward end; 3. There are air holes on the periphery of the inward end, so the airflow formed can be blown toward the outer wall of the box body and turned at the gap X3 to form a centripetal and centrifugal diversion pressure. Thus, a barrier to prevent overflow is formed at the gap X3. However, as can be seen from the above, the biogas inside the box body is transported in a high-pressure state, so it is necessary to ensure that the barrier pressure formed by the wind pressure sealing ring is greater than the overflow pressure. To this end, it is only necessary to adjust the output speed of the motor to increase or decrease the air pressure of the airflow formed, that is, the barrier strength is adjustable. As an optimization design for the fan operation control, an air pressure sensor can be installed near the rotating shaft in the box and the detection results can be fed back to the fan controller in real time, and the controller can adjust the output speed of the motor accordingly. On the one hand, it is helpful to increase or decrease the air supply rate from the air inlet duct to the air outlet duct, and on the other hand, it is also helpful to adjust the barrier strength outside the box and prevent odor from overflowing; at the same time, a reasonable energy consumption utilization rate is also achieved. Of course, the implementation method of fan operation control through the controller is a common function implementation, so detailed description is omitted.

[0022] From the further refinement of features, such as Figure 3As shown, the wind pressure sealing ring 3 is provided with six spoiler blades 33 equally distributed in the circumferential direction, and an air hole 34 with a diameter of 6-8 mm is provided in the area between two adjacent spoiler blades at the outer periphery of the inner end. Figure 2 As shown in the lower part, the outer plane of the Teflon anti-oxidation plate 5 is provided with an annular groove 52 for airflow return, which is directly opposite to the air hole 34. Here, the airflow formed by any spoiler blade will be blown out from the adjacent air hole to the box body, and the annular groove can better extend the power of the airflow flowing out of the air hole, avoid the formed airflow from stagnating at the air hole, and the returned airflow collides with the airflow blown out from the front, which will better turn and diffuse in the gap X3 and form a barrier for isolation.

[0023] From the perspective of the connection between the wind pressure sealing ring and the rotating shaft, Figure 2 and Figure 3 As can be seen from the embodiment shown, the wind pressure sealing ring 3 is a spliced ​​body separated in half axially. That is, the upper half spliced ​​body A and the lower half spliced ​​body B, of course, the left and right half separation is also possible. Moreover, each spliced ​​body is bent inward at the butt edge to form an assembly plate 35, and one or more through screw holes are provided on the overlapping assembly plates. The upper half spliced ​​body A and the lower half spliced ​​body B are fixed into one piece by screws 7 passing through the screw holes.

[0024] Of course, since it is quite inconvenient to operate the screws in the open hole, there are many other optional and more convenient installation and fixing implementation methods for the splicing body. Figure 2 or Figure 3 The difference between the pair of splicing bodies shown is that the screw holes on the assembly plate are replaced by magnetic blocks, and the magnetic blocks on the assembly plates on the two opposite sides have different polarities. In this way, when the two parts of the splicing body are close to each other, they can be magnetically adsorbed into one body, and when they need to be disassembled, as long as an external force drives a part of it to be axially translated to a certain degree of misalignment, the two parts can be separated. Of course, it is also possible to align the two parts without forming the assembly plate, and directly clamp them together by the hoop on the outside in a surrounding shape, and the convenience of disassembly is also expected.

[0025] From the above introduction to the improved structural scheme of the fan and the detailed description of the embodiments of the present invention, it can be seen that the present scheme has outstanding substantial characteristics and remarkable progress: by utilizing the wind pressure sealing ring sleeved on the rotating shaft, an adjustable air pressure closed loop is formed from the periphery to the inside while rotating, and the channel for the overflow of biogas is sealed therein, and the anti-odor overflow rate reaches more than 97%, which effectively improves the factory environment around the fan and enhances human comfort and safety.

[0026] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the scope of protection required by the present invention.

Claims

1. A circulating fan for sludge disposal and drying, comprising a housing, an impeller in the housing, a motor outside the housing, and a rotating shaft connected to the impeller and the motor respectively inside and outside the housing, and the housing is sealed and connected to the air inlet pipe and the air outlet pipe in two directions, characterized in that: The rotating shaft is sleeved with an integral and rotating wind pressure sealing ring at a position close to the outer wall of the box body, the inner end of the wind pressure sealing ring close to the box body is matched with the surface gap of the box body, and the outer end away from the box body is set as a trumpet-shaped opening, and six circumferentially equally distributed and independent spoiler blades are distributed on the ring wall inside the opening, the spoiler blades are formed into an arc surface that guides flow from the outside to the inside along the rotation direction of the rotating shaft, and an air hole with a diameter of 6-8mm is provided in the area between two adjacent spoiler blades at the outer periphery of the inner end; a Teflon anti-oxidation plate is fixedly installed between the outer wall of the box body and the wind pressure sealing ring, the inner plane of the Teflon anti-oxidation plate fits the outer wall of the box body, and the outer plane is provided with a groove corresponding to the outer diameter of the inner end on the outer periphery of the rotating shaft perforation, the inner end matches the gap of the groove, and the outer periphery of the inner end matches the gap of the outer plane of the Teflon anti-oxidation plate; the outer plane of the Teflon anti-oxidation plate is provided with an annular groove facing the air hole for air flow return.

2. The sludge treatment and drying circulating fan according to claim 1 is characterized in that: The gap of the gap matching is 0.5~1mm.

3. The sludge treatment and drying circulating fan according to claim 1 is characterized in that: The wind pressure sealing ring is a spliced ​​body separated into two halves in the axial direction, and each spliced ​​body is bent inwardly at the butt edge to form an assembly plate.

4. The sludge treatment and drying circulating fan according to claim 3 is characterized in that: One or more through screw holes are arranged on the aligned and overlapped assembly plates, and a pair of the splicing bodies are screwed and fixed into one body.

5. The sludge treatment and drying circulating fan according to claim 3 is characterized by: A first magnetic block is embedded in the assembly plate of one side of the splicing body, and a second magnetic block is embedded in the assembly plate of the other side of the splicing body. The first magnetic block and the second magnetic block have different polarities, and the pair of splicing bodies are fixed together by magnetic attraction.

6. The sludge treatment and drying circulating fan according to claim 1 is characterized in that: The wind pressure sealing ring is a spliced ​​body separated into two halves in the axial direction, and a pair of the spliced ​​bodies are clamped into one body by a hoop sleeve.

7. The sludge treatment and drying circulating fan according to claim 1 is characterized by: One or more bearing seats and bearings connected therein are arranged between the wind pressure sealing ring and the motor, and the rotating shaft is connected to the bearings for axial positioning and driven to rotate.

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