JP2008183506A - Centrifugal separator, and method for controlling centrifugal separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal separator capable of facilitating a maintenance operation, and preventing mists from entering into a rotary mechanism part. <P>SOLUTION: The centrifugal separator 1 comprises: a rotor 10; a rotary mechanism part 3 including a rotary shaft 4 connected to the rotor 10 and a motor 13 for driving; and a suspension liquid discharge part 14 discharging a misted suspension liquid L to the internal space 12 of the rotor 10; and a scraper peeling mechanism 18 provided with a scraper 6 scraping a deposition layer 7. The rotor 10 and the rotation mechanism part 3 are fitted to the upper direction so as to be freely attachable/detachable. Further, the scraper 6 is fitted with a pressure detection sensor 38, and the timing of stopping the discharge of the suspension liquid L can be detected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a centrifugal separator and a control method of the centrifugal separator, and in particular, a centrifugal separator that can simplify maintenance work, prevent mist from entering a rotating mechanism, and suppress occurrence of a failure. The present invention relates to a control method of a centrifugal separator that can be operated in a control cycle that can further improve the separation effect.

  Conventionally, it is discharged from factory waste liquids including working coolant and lubricants discharged from machine tools and factory equipment such as various cutting devices and polishing devices, or as a result of consumer activities from general offices and general households. The domestic waste liquid is not discharged into the river as it is, and environmentally friendly wastewater treatment is performed before the discharge. These factory effluents and domestic effluents may contain many impurities such as sludge, solids, and chemical substances, which may cause river water pollution, bad odors, standby pollution, etc. There was a factor of the. Therefore, there are cases where a lot of harmful components are mixed, such as destroying the ecosystem and causing a serious deterioration of the natural environment, causing pollution and directly damaging human health. . For this reason, the national and local governments regulate the direct discharge of these factory effluents to rivers and soils, etc., and clearly discharge such that those that have been processed to a predetermined standard or lower are discharged. Standards are set by regulations.

  On the other hand, factory waste liquids discharged from factories and the like may contain a lot of materials (materials) that can be effectively used as materials again through processing such as filtration. From the viewpoint of reducing costs and the like, these are sometimes collected before being discharged and processed for reuse. Here, as an apparatus for performing a separation process such as filtration, for example, a centrifugal separator that can be separated into a solid and a liquid based on the specific gravity difference of each component contained in the waste liquid using the principle of centrifugal force May be used.

  A general configuration of a centrifugal separator is, for example, a substantially conical rotator (bowl) with an opening facing downward, a rotating mechanism that rotates the rotator around a cylinder axis at high speed, and a rotator. Is mainly provided with a configuration such as a spraying section that supplies a processing liquid (suspension) to be processed into the inside of the casing and sprays (discharges) vigorously toward the inner wall surface of the rotating body in a high-speed rotation state. ing. Thus, when the sprayed suspension reaches the inner wall surface of the rotating body that rotates at high speed, it receives a centrifugal force by the rotation of the rotating body. That is, the force which moves toward the outer peripheral direction of a rotary body acts along the inner wall surface of a rotary body strongly. At this time, a component having a high specific gravity in the treatment liquid is easily affected by the centrifugal force, whereas a component having a low specific gravity is less likely to be affected by the centrifugal force than a component having a high specific gravity.

  As a result, in the interior of the rotating body, particularly in the vicinity of the inner wall surface, each component is separated due to the difference in specific gravity, thereby forming each region. At this time, the component having a high specific gravity always receives an outward force due to the centrifugal force of the rotating body, but after reaching the inner wall surface of the rotating body, the movement by the force is limited by the inner wall surface. Therefore, a substance having a high specific gravity component is gradually deposited on the inner wall surface.

  Then, when the layer thickness of the deposited layer mainly composed of the high specific gravity component reaches a predetermined value (maximum layer thickness allowable value), the rotation of the centrifugal separator is stopped once, and the high specific gravity mainly composed of solid matter is stopped. The component accumulation layer is peeled off from the inner wall surface of the rotating body using, for example, a scraping plate-like member called a scraper, and a recovery casing (recovery) provided so as to face the lower part of the opening. Part). The solid object constituting the deposited layer may be referred to as “sludge”.

  On the other hand, the low specific gravity component (mainly liquid component) separated by the centrifugal separation action of the rotating body is difficult to reach the inner wall surface by the above-mentioned deposited layer, and therefore gradually moves upward of the rotating body. . And it will be guide | induced to the exterior of a rotary body from the collection port previously opened on the upper surface of the rotary body, and will be collect | recovered. Here, in general, the recovery port is often provided on the inner peripheral side of the inner wall surface of the rotating body. As a result, using the difference in specific gravity of the suspension (treatment liquid) to be separated, the low specific gravity component and the high specific gravity component are centrifuged, and only the low specific gravity component is recovered from the rotating body. The high specific gravity component deposited on the inner wall surface is recovered by performing a scraping process using a scraper from an opening of a rotating body that opens downward. Thereby, the processing liquid can be physically separated. Further, since the recovered high specific gravity component is mainly a solid matter such as sludge, it is often subjected to a treatment such as landfill.

  As a result, chemical purification treatment methods that use conventional chemicals, biological purification treatment methods that use microorganisms, or filtration adsorption that collects solid materials using filter materials or adsorbents Compared with the purification treatment method, it is easier to manage the labor and conditions related to the treatment, and therefore this centrifuge is widely used in many factories and the like. In addition, since chemicals, microorganisms, etc. are not used, it is possible to avoid the danger of separation work, and the cost of consumables such as filter media and adsorbents is almost required. It can be said that it is an excellent device in terms of not. In addition, a centrifugal separator capable of efficiently separating a suspension composed of a plurality of components having different specific gravities by the applicant of the present application without increasing the rotational speed of a rotating body that applies centrifugal force. Development has also been carried out (see Patent Document 1).

JP 2005-349371 A

  However, the centrifuge described above may cause the following problems. That is, the rotating body for applying centrifugal force to the suspension is generally installed with the opening facing downward, and it is difficult to clean the inner wall surface of the rotating body in this state. . That is, even when the deposited layer is scraped off by the scraper, a part of the deposited layer (sludge) may adhere to the inner wall surface of the rotating body. Therefore, in order to completely remove these deposits, it is necessary for the worker to perform a cleaning operation while being forced to take an unreasonable posture to sink under the rotating body.

  Further, when the rotating body is rotated, a component having a low specific gravity has a property of gradually moving along the inner wall surface of the rotating body and moving upward. However, a complex rotating mechanism for rotating a rotating body such as a rotating shaft at a high speed is provided above the rotating body, and a low specific gravity liquid component (misted) as it moves upward (atomized). When the water component is mainly in contact with these mechanisms, there is a possibility that the rotation of the rotating mechanism portion may become unstable and a failure such as rust may occur. For this reason, it is necessary to take measures to prevent these water components from adhering to the rotating mechanism, but there are few conventional centrifugal separators having such an adhesion preventing function.

  In addition, in the conventional centrifuge, the operation start / stop determination of the device itself is mainly based on subjective judgment based on the will or sense of the operator, or the elapsed time from the start of operation such as a timer. Often done based on uniform judgment. Therefore, depending on the components contained in the suspension to be centrifuged, the high specific gravity component adheres to the inner wall surface of the rotating body extremely rapidly, and a thick deposit layer is already formed before the operation stop control by a timer or the like. There was a possibility of contacting with a part of the scraper formed and disposed in the inner space of the rotating body so as to be separated from the inner wall surface. In this case, only the upper layer of the deposited layer is constantly scraped by the scraper, which has been a factor that hinders the high-speed rotation of the rotating body. Further, when the deposited layer continues to be attached, a force that presses the scraper toward the center of rotation is applied, and the scraper may be deformed. Therefore, the centrifuge is capable of setting the operation stop timing according to the state of deposition of the deposited layer, rather than being subjective (empirical) according to the will of the conventional worker or a uniform one such as a timer. Development of was desired.

  In addition, in the conventional centrifugal separator, the deposited layer mainly composed of the centrifuged high specific gravity component is scraped and collected from the inner wall surface of the rotating body by a scraper. However, the deposited layer immediately after the separation may have a lot of low specific gravity components such as water remaining, and recovering them as they are will transport heavy objects, increasing transportation costs or landfilling. When it is reused, etc., a drying process may be required. Therefore, an attempt to reduce the volume of the deposited layer to be collected as much as possible and reduce the weight has been desired.

  Therefore, in view of the above circumstances, the present invention facilitates cleaning and maintenance work on the rotating body and the rotating mechanism unit, prevents mist from entering the rotating mechanism unit, detects the timing of operation stop, and performs centrifugal separation. To provide a centrifuge capable of performing stop control of the apparatus, and a control method of the centrifuge capable of collecting in a reduced volume and weight reduced state by reducing the bulk of the deposited layer to be collected as much as possible. It is to be an issue.

  In order to solve the above-described problem, the centrifugal separator of the present invention includes: a substantially bowl-shaped rotating body disposed with an opening facing downward, a rotating shaft having an upper surface and one end connected to the rotating body, and A rotating mechanism having a drive motor for rotating the rotating shaft in the axial direction and generating a centrifugal force in the inner space of the rotating body, and a suspension mixed with different specific gravity components to be centrifuged A suspension supply pipe connected to the suspension liquid feeding means for pumping and supplying the internal space of the rotating body from above the rotating body along the rotation axis; and the suspension supply pipe; A suspension discharge unit that connects and has a nozzle provided with a discharge port in the internal space, and discharges the suspension to the internal space of the rotating body that is rotated by the rotation mechanism; and A scraper that at least partially matches the shape of the inner wall surface of the rotating body. A scraper capable of scraping off the accumulated layer of the suspension deposited on the inner wall surface by centrifugal separation with the rotating body, and inserted into the inner space from below the rotating body through the opening. A scraper support arm for supporting the scraper in the inner space, and a scraper position where the scraper end is brought close to the inner wall surface to scrape and peel off the deposited layer, and a spaced position separated from the inner wall surface. A centrifugal separator having a scraper displacing mechanism having a scraper displacing portion for displacing, wherein the rotating mechanism is formed such that the rotating shaft is detachable from the driving motor and the rotating body, and the rotation The shaft and the rotating body are formed so as to be removable in an integrated state from above ".

  Here, the rotating body having a substantially bowl shape is generally formed of a metal material and can be exemplified by a cone shape, a truncated cone shape, or a mortar shape. And it has a wide-diameter opening part, and has an internal space (internal space) that can accommodate liquid, gas, etc. inside, and is formed so as to expand from the opening in the outer peripheral direction. Some have. The centrifugal separator according to the present invention is arranged in a state in which the opening of the rotating body is directed downward, in other words, with the opening facing the installation floor, and connected to the rotating mechanism unit. It can rotate at high speed according to the rotation axis. Here, the rotational speed (or rotational speed) of the rotating body can be appropriately set according to the properties (viscosity, etc.) of the suspension to be treated and the separation efficiency. It is also possible to generate a centrifugal force of about 6000 G on the inner wall surface of the rotating body by rotating at a rotational speed of 5500 rpm.

  Further, the rotating mechanism connected to the rotating body includes, as a configuration other than the rotating shaft and the driving motor, for example, a bearing that can support the rotating shaft along a substantially vertical direction, and the rotating shaft and the entire bearing. It has a configuration such as a shaft cover for covering and covering. In addition, the main structure of these rotation mechanism parts can apply the well-known rotation mechanism technique utilized in the existing centrifugation apparatus or the apparatus which has another rotation mechanism.

  On the other hand, the scraper peeling mechanism unit physically scrapes and removes the deposited layer deposited on the inner wall surface of the rotating body by the scraper accommodated in the inner space of the rotating body. In addition, the component with high specific gravity which comprises the scraped peeling layer falls to the collection | recovery part provided under the opening part, and is collect | recovered.

  Therefore, according to the centrifugal separator of the present invention, the suspension composed of a plurality of components having different specific gravities is introduced into the inner space of the rotating body rotating at high speed, and the centrifugal force generated by the rotating body is affected. The received suspensions are each separated based on the difference in specific gravity. Here, in the centrifugal separator according to the present invention, the rotating shaft of the rotating mechanism unit that rotates the rotating body is formed so as to be detachable from the driving motor and the rotating body. In other words, the rotating mechanism and the rotating body are frequently used for rotating at high speed, and it is necessary to frequently replace parts and the like. Therefore, by forming the rotating shaft and the rotating body so as to be detachable, it becomes possible to easily replace the parts when a problem or the like occurs. Furthermore, the rotating shaft and the rotating body can be integrated upward and removed. Here, below the rotating body, a recovery unit for recovering sludge such as a scraped release layer is provided, and a complicated configuration such as a scraper peeling mechanism unit for displacing the scraper is installed. Therefore, when it is going to remove a rotary body, these structures become obstructive and become very difficult. Therefore, according to the centrifugal separator of the present invention, the rotary shaft housed in the bearing case or the like and the rotary member connected to the rotary shaft are removed so as to be lifted upwardly of the centrifugal separator, whereby It becomes possible to easily clean the wall surface. In addition, replacement and maintenance work for a rotating mechanism such as a rotating shaft that is abused by high-speed rotation is facilitated, workability is improved, and no harsh labor is imposed on the operator.

  Further, the centrifugal separator according to the present invention has, in addition to the above configuration, “an airflow that flows from the upper side toward the lower rotary body along the axial direction of the rotary shaft that is rotated by the driving motor. It may be provided with an airflow generating means for generating

  Here, the airflow generation means uses, for example, a device in which a plurality of blades are attached to a rotating shaft and wind (airflow) is generated in the direction of the rotating body by the blades according to the rotation of the rotating shaft, or an air pump is used. The air pump outlet may be attached to the rotating shaft or the vicinity thereof.

  Therefore, according to the centrifugal separator of the present invention, a mist-like low specific gravity component that tends to rise along the inner wall surface of the rotating body and to rise further along the rotating shaft is generated. It becomes possible to push back downward by the airflow. As a result, the mist (low specific gravity component) trying to rise upward of the rotating body moves along the side of the upper surface of the rotating body. Thereby, contact with a rotation mechanism part and mist etc. is avoided and generation | occurrence | production of malfunctions, such as a rust, is suppressed.

  Further, the centrifugal separator according to the present invention may include, in addition to the above configuration, “the scraper peeling mechanism portion further includes a pressure detection sensor for detecting a pressure with respect to the scraper, and the scraper displacement portion allows the maximum allowable deposition layer. The scraper is displaced to the separated position separated from the inner wall surface by a distance corresponding to the layer thickness, and the deposited layer is deposited on the inner wall surface of the rotating body. The layer and the scraper are in contact with each other, the movement of pressing the scraper toward the center of the rotating body is detected by the pressure detection sensor, and the driving of the rotating body and the supply of the suspension are stopped and controlled. It does not matter.

  Therefore, according to the centrifugal separator of the present invention, the contact between the scraper and the deposited layer can be detected by providing the pressure detection sensor capable of detecting the pressure on the scraper. As a result, the sedimentation layer adheres thickly, the operation of the centrifugal separator becomes a rotating body in a state where the separation action due to centrifugal force is reduced, the scraped layer is scraped off by the scraper, and the separation efficiency is restored to the original state. In this state, by rotating the rotating body again at a high speed, it is possible to efficiently perform the separation process using the centrifugal force. In addition, when the scraper is pressed toward the center of the rotating body by the deposited layer, it is controlled to stop rotating immediately, so that an excessive force continues on the scraper for a long time and a strong force that causes the scraper to deform. Does not work. Thereby, problems such as breakage of the scraper can be avoided. As a result, the suspension can be centrifuged with a stable separation efficiency.

  Furthermore, in addition to the above configuration, the centrifugal molecular device of the present invention may be one in which “the scraper angle of the scraper with respect to the inner wall surface of the rotating body is set to 100 ° or more and 150 ° or less”. Absent.

  Therefore, according to the centrifugal separator of the present invention, the scraper angle with respect to the inner wall surface of the rotating body of the scraper is set to 100 ° or more and 150 ° or less, more preferably 115 ° or more and 125 ° or less. Here, when the scraper angle is smaller than 100 °, the deposited layer gradually accumulates between the scraper and the inner wall surface of the rotating rotating body, and a so-called “biting” state may occur. As a result, smooth rotation of the rotating body may be hindered, and the possibility that the scraper is deformed by the deposited layer is increased. On the other hand, when the scraper angle is set larger than 150 °, only the surface of the deposited layer is scraped (scraped), and there is a high possibility that the deposited layer cannot be completely scraped from the inner wall surface of the rotating body. That is, it is expected that the scraping efficiency by the scraper is significantly reduced. Therefore, by setting the scraper angle within the above numerical range, the deposited layer can be scraped in a stable state.

  On the other hand, the control method of the centrifuge of the present invention is “a control method of a centrifuge using the above-described centrifuge, wherein the rotating mechanism and the suspension discharge unit are interlocked, and the rotating body is A centrifugal separation step of discharging the suspension into the inner space and depositing a deposited layer separated from the suspension by centrifugal force on the inner wall surface; and A dehydration step of stopping discharge, rotating the rotating body by controlling the rotating mechanism, and further separating and removing a low specific gravity component including a water component contained in the deposited layer by applying a centrifugal force; A scraping step of controlling the scraper peeling mechanism and scraping the dehydrated deposited layer from the inner wall surface of the rotating body using the scraper, and remaining on the scraped inner wall surface of the deposited layer Cleaning process for cleaning sludge It is mainly composed of those.

  Here, in the case of the conventional centrifugal separator, after rotating the rotating body and performing centrifugal separation, the deposited layer deposited on the inner wall surface of the rotating body is immediately scraped with a scraper. However, the deposited layer in such a state is formed by separation of the suspension, and therefore includes a lot of low specific gravity components.

  Therefore, according to the control method of the centrifugal separator of the present invention, the low specific gravity component contained in the deposited layer is further removed by continuing the high speed rotation of the rotating body after stopping the discharge of the suspension. That is, the deposited layer can be dehydrated. As a result, the amount of the deposited layer (sludge) recovered in the recovery unit can be reduced by dehydration, and the weight of the sludge during recovery can be reduced. For this reason, even when transport costs and sludge are reused for landfill work, processing such as re-drying can be reduced. Thereafter, after the deposited layer is scraped off by a scraper, a cleaning process is performed to spray a cleaning liquid or the like on a part of the sludge remaining on the inner wall surface of the rotating body to wash away the sludge by the hydraulic pressure. As a result, a small amount of sludge that cannot be completely removed by the scraper can be removed from the inner wall surface, and the separation efficiency by the rotating body is not lowered.

  As an effect of the present invention, by installing the rotating shaft and the rotating body so as to be detachable upward, it is possible to remarkably reduce the time required for exchanging the rotating mechanism portion and the rotating body, and to perform maintenance work after removing the rotating shaft and the rotating body. Therefore, such work can be facilitated.

  In addition, by generating an air flow downward along the rotation axis, the mist component that tends to rise along the rotation axis from the inner wall surface of the rotation body is pushed back, and the low component provided on the upper portion of the rotation body. These can be recovered from the recovery port for specific gravity components. Furthermore, by providing a pressure detection sensor in the scraper, it is possible to grasp the state of the inner space that cannot be visually recognized when the rotating body rotates, and to stop the separation process by the rotating body when the scraper contacts the deposited layer. Can be performed. Thereby, the separation efficiency can always be kept constant. Furthermore, the volume of sludge can be reduced by providing a dehydration process for removing low specific gravity components from the deposited layer after the separation treatment.

  Hereinafter, a centrifugal separator 1 according to an embodiment of the present invention, and a centrifugal separator control method 2 using the centrifugal separator 1 (hereinafter simply referred to as “control method 2”) will be described with reference to FIGS. Based on Here, FIG. 1 is a schematic cross-sectional view showing a schematic configuration of the centrifugal separator 1 of the present embodiment, and FIG. 2 shows the separated rotating mechanism unit 3 and rotating body 10 and fins 5 attached to the rotating shaft 4. 3 is an explanatory diagram showing an example of the scraper 6 at the peeling position SP, and FIG. 4 is an explanatory diagram showing an example of detection of the deposited layer 7 by the scraper 6 at the separation position LP. FIG. 5 is a flowchart showing the flow of processing of the control method 2 of the present embodiment. Note that in FIGS. 1 to 4, a part of the cross section and the like are not shown for the sake of simplicity.

  The centrifugal separator 1 according to the present embodiment is intended for a centrifugal separation treatment of a suspension L in which a plurality of components discharged from a factory or the like are mixed. For example, the centrifugal separator 1 is discharged from a rice mill that produces wash-free rice. Examples of such industrial waste liquids include those that process “rice soup” and cutting coolant liquids discharged from machining plants. In these suspensions L, solid phase components 9 such as rice bran and metal dust are dispersed in the liquid phase components 8 such as water and oil. Note that the suspension L to be processed by the centrifugal separator 1 of the present embodiment is particularly suitable for separating the suspension in which the specific gravity difference between the liquid phase component 8 and the solid phase component 9 is relatively approximate. .

  As shown in FIGS. 1 to 4, the centrifugal separator 1 of the present embodiment includes a substantially bowl-shaped rotating body 10, a rotating shaft 4 in which an upper surface of the rotating body 10 and a lower end shaft portion 11 are connected, and the rotation. The rotating mechanism 3 mainly includes a driving motor 13 for generating a centrifugal force in the inner space 12 of the rotating body 10 by rotating the shaft 4 in the axial direction at a high speed, and the inner space 12 of the rotating body 10 is centrifuged. The suspension L to be separated is supplied from the upper part of the rotating body 10, and the suspension L is discharged by misting the suspension L toward the inner space 12, and the suspension L is centrifuged. And a scraper peeling mechanism 18 having a scraper 6 that scrapes off the deposited layer 7 deposited on the inner wall surface 15 of the rotating body 10. Here, the rotator 10 is accommodated in the rotator accommodating space 16 of the basic housing part 17 having a substantially L-shaped cross section formed so as to surround the periphery thereof. Furthermore, the lower end of the rotation mechanism unit 3 is in contact with a part of the upper surface of the basic housing unit 17 and is detachably attached to a fixture such as a fixing bolt 31 (details will be described later).

  More specifically, the rotating body 10 used in the centrifugal separator 1 of the present embodiment has an opening 19 that opens downward, and the outer peripheral direction obliquely upward from the opening 19 (see FIG. 2 and the like). ) And the side inclined wall portion 20 is formed so as to expand, and has a frustoconical shape in which the center and the vicinity of the upper end swell with respect to the opening diameter of the opening portion 19. Furthermore, from the upper end of the side inclined wall portion 20, there is a hanging wall portion 21 that is bent in a direction substantially perpendicular to the installation floor (not shown) (corresponding to the vertical direction in the drawing in FIG. 2). A bent portion 22 bent in a substantially horizontal direction from the upper end of the portion 21 to the inner peripheral side of the rotating body 10 is provided, and the rotating body upper surface portion 23 is formed by the bent portion 22. That is, the rotating body upper surface portion 23 closes the upper surface of the rotating body 10 and creates a state in which the inner space 12 is mainly opened only downward.

  Further, the lower end shaft portion 11 of the rotating shaft 4 is connected to the rotating body upper surface portion 23. In addition, a recovery hole portion 24 is provided in a part of the upper surface portion 23 of the rotating body in order to recover the liquid component 8 having a low specific gravity separated by the centrifugal separation action, that is, mainly the water component. As a result, the rotating body 10 can generate a centrifugal force in the inner space 12 with the opening 19 facing downward with the rotating shaft 4 as an axis, and the liquid phase component 8 separated by the difference in specific gravity. Only the above-described recovery hole 24 is discharged to the outside of the rotating body 10. In addition, by rotating the rotating body 10 with the above-described configuration, for example, when the rotating body 10 is rotated at a rotation speed of 1000 rpm or more, centrifugal force acts from below to above in the inner space 12. The substance receives a force that reaches the bent portion 22 from the inclined wall portion 20 through the vertical wall portion 21. Therefore, the suspension L discharged from the suspension discharge unit 14 to be described later is separated into a low specific gravity component (liquid phase component 8 such as water) and a high specific gravity component (solid phase component 9) by centrifugal indentation. Thus, the liquid phase component 8 is discharged from the recovery hole 24, and the solid phase component 9 adheres to the inner wall surface 15 of the rotating body 10 and is deposited. In the centrifugal separator 1 of the present embodiment, the rotating body 10 is formed of a material using aluminum as a raw material in order to reduce the overall weight.

  On the other hand, the rotation mechanism unit 3 has, as its basic configuration, the rotating shaft 4 connected to the rotating body upper surface portion 23 of the rotating body 10 described above, the vicinity of the lower shaft end portion 11 and the shaft center portion 25 of the rotating shaft 4. A bearing having a pair of bearing portions 27 that rotatably support the rotary shaft 4 along the vertical direction by a plurality of bearings 26, and further formed so as to cover substantially the entire rotary shaft 4. Case 28, drive motor 13 for generating a rotational force for rotating rotator 10 along rotating shaft 4 at a high speed, and rotating shaft side teeth attached to a part of the circumference of rotating shaft 4 A pulley (not shown) and a motor-side toothed pulley (not shown) installed on the motor shaft 29 of the drive motor 13 are connected to transmit the rotational force of the drive motor 13 to the rotary shaft; Toothed bell that can be meshed with each toothed pulley It is mainly configured by including a 30. In addition, the rotation mechanism unit 3 is provided above the rotation shaft 4 (above the shaft center portion 25) as another configuration, and the scraper 6 is brought close to the inner wall surface 15 of the rotating body 10 by the scraper peeling mechanism unit 18. Further, a low-speed rotating motor 32 for scraping the deposited layer 7 (sludge 41) and peeling it from the inner wall surface 15 while rotating the rotating body 10 at a low speed while being displaced to the peeling position SP is further provided. It has. Note that a bearing portion 27 is provided near the upper end of the rotary shaft 4 via the bearing 26 as described above, and the rotational drive by the low-speed rotation motor 32 can be pivotally supported. Further, the rotation mechanism unit 3 is used for switching to transmit the rotation by either the high-speed rotation drive motor 13 for centrifugal separation or the low-speed rotation motor 32 to the rotation shaft 4. A clutch mechanism (not shown) is also provided.

  Here, the rotation mechanism unit 3 and the rotating body 10 described above are formed to be detachable via bolts 31. Furthermore, the rotation mechanism unit 3 is fastened to the basic casing unit 17 via bolts 31, and the rotation mechanism unit 3 can be attached to and detached from the basic casing unit 17. Therefore, the rotation mechanism unit 3 can easily remove the entire configuration excluding the drive motor 13 and the low-speed rotation motor 32 from the basic housing unit 17. More specifically, when the fastening by the bolt 31 is released and the toothed belt 30 is removed, the rotation mechanism unit 3 is pulled up above the basic housing unit 17, so that the entire rotation mechanism unit 3 is removed. Is done. In this case, the rotating body 10 attached to the rotating shaft 4 of the rotating mechanism unit 3 can be pulled up together. As a result, it becomes possible to easily perform a cleaning operation on the inner wall surface 15 of the rotating body 10, which has been difficult in the past, and to easily perform operations such as maintenance and component replacement on the rotating mechanism unit 3.

  Furthermore, the rotation mechanism part 3 of the centrifugal separator 1 of the present embodiment has a plurality of fins 5 attached to the circumference of the rotation shaft 4 (see FIG. 2 and the like). With such a configuration, when the rotational force of the drive motor 13 is transmitted to the rotary shaft 4 and the rotary shaft 4 supported by the bearing portion 27 in the bearing case 28 rotates at a high speed, an air flow W is generated by the fins 5. Can be made. Depending on the mounting angle of the fin 5, the air flow W generates a flow from the upper side (the upper end of the rotating shaft 4) to the lower side (the direction of the rotating body 10). Here, the fin 5 corresponds to the airflow generating means in the present invention. As a result, while performing the centrifugal separation process by the centrifugal separator 1, that is, while rotating the rotating body 10 at a high speed, an air flow W is always generated from the upper side to the lower side along the rotary shaft 4. Will be. As a result, the low specific gravity component (liquid phase component 8) such as the water component separated by the centrifugal separation and reaching the recovery hole portion 24 rises further along the rotating shaft 4 by colliding with the air flow W. Never come. As a result, the liquid phase component 8 such as a water component does not touch the rotation mechanism unit 3.

  The suspension discharge unit 14 is for discharging the suspension L to the inner space 12 of the rotating body 10, and as a configuration thereof, the suspension discharge unit 14 previously stores the suspension L to be centrifuged. Connected to a turbid liquid storage tank (not shown) and a liquid feed pump (not shown) for applying pressure to pump the suspension L to the inner space 12 of the rotating body 10, the center of the rotating shaft 4 was hollowed out. The suspension L is sent out to the inner space 12 of the rotating body 10 and can be supplied, and the suspension supply pipe 33 that can be supplied and the suspension supply that is partially inserted into the inner space 12 of the rotating body 10 The nozzle 34 is formed mainly in the vicinity of the end of the pipe 33 and sprays the mist-like suspension L onto the inner space 12 (specifically, the inner wall surface 15) of the rotating body 10. . Here, as shown in FIGS. 1 and 2, the upper end of the suspension supply pipe 33 is connected to the liquid feed pump and the suspension storage tank, and the rotary shaft 4 and the like are disposed around the suspension supply pipe 33. Will be placed. Therefore, the suspension supply pipe 33 itself does not rotate. Furthermore, at least a pair of nozzles 34 arranged near the center of the inner space 12 of the rotating body 10 is capable of spraying the suspension L in the form of a mist (mist) on the inner wall surface 15 in two directions. Is provided. The tip of the nozzle 34 may be formed with a plurality of holes (not shown) to enable spraying (discharge) in multiple directions. If the number of these holes is large, a large amount of air may be required for feeding pressure. Therefore, in order to suppress a decrease in the efficiency of atomization, the number is 16 or less per place. It is desirable to design as follows. In addition, each hole is desirably designed to open to a size of at least 10 mm in order to avoid clogging by the relatively large-diameter solid phase component 9 contained in the suspension.

  Further, the scraper peeling mechanism portion 18 has a scraper end portion 35 formed so as to substantially coincide with the inner wall surface shape of the inner wall surface 15 formed by the side inclined wall portion 20 and the hanging wall portion 21 of the rotating body 10. The scraper 41 composed of the solid phase component 9 attached to the inner wall surface 15 or the scraper 6 for physically scraping the deposited layer 7 on which the sludge 41 is deposited, and the scraper 6 are supported in the inner space 12 of the rotating body. An arm-shaped scraper arm 36 and a scraper displacing portion 37 composed mainly of an actuator or the like that generates a moving force for displacing the scraper 6 between the peeling position SP and the separation position L. It is configured.

  More specifically, as shown in FIGS. 3 and 4, the scraper peeling mechanism portion 18 is connected to a substantially central portion of the scraper arm 36, and an arm support portion 46 that rotatably supports the scraper arm 36. And an arm connecting portion 48 for connecting the end portion of the scraper arm 36 and the extendable actuator arm 47 of the scraper displacement portion 37, and a part of the arm connecting portion 48. It mainly comprises a stopper 44 for restricting the movement to a certain range.

  As a result, as shown in FIGS. 3 and 4, the scraper end portion 35 of the scraper 6 can be displaced between the separation position SP close to the inner wall surface 15 and the separated separation position LP. Further, a pressure detection sensor that detects a force (pressure) applied to the scraper 6 is installed in the scraper displacement portion 37 that displaces the scraper 6. In the centrifugal separator 1 of the present embodiment, when the suspension L is discharged into the inner space 12 and the separation process is performed by centrifugal force, the scraper 6 supported in the inner space 12 by the scraper arm 36 is included in the scraper 6. Almost no pressure is applied. For this reason, in a normal centrifugal separation process, the pressure detected by the pressure detection sensor 38 is almost zero.

  However, when the suspension L is discharged into the inner space 12 and the sludge 41 gradually adheres to the inner wall surface 15 and the thickness of the deposited layer 7 increases, there is a possibility of coming into contact with the scraper 6 at the separation position LP. (See FIG. 4). At this time, the distance between the scraper end portion 35 at the tip of the scraper 6 at the separation position LP and the inner wall surface 15 of the rotating body 10 is set to be the maximum allowable layer thickness of the deposited layer 7.

  Therefore, when the thickness of the deposition layer 7 gradually increases and comes into contact with the scraper end portion 35 of the scraper 6, that is, when the layer thickness of the deposition layer 7 reaches the maximum allowable layer thickness, The top surface of the layer 7 comes into contact with the scraper 6. Then, the scraper 6 is pressed in the direction of arrow A shown in FIG. In this state, when the discharge of the suspension L and the rotation of the rotating body 10 are continued and the centrifugal separation process is continued, only the uppermost surface of the deposition layer 7 is scraped off by the scraper 6, and the scraper 6 and the deposition layer 7 are continued. Are always in contact with each other, and smooth rotation of the rotating body 10 is impeded. Furthermore, since the deposition layer 7 is thickly attached, the separation effect due to the centrifugal force of the rotator 10 is reduced, and the smooth rotation of the rotator 10 is hindered (for example, generation of vibration or the like). .

  Therefore, in the centrifugal separator 1 of the present embodiment, the pressure detection sensor 38 that detects the pressure on the scraper 6 is provided, and when the pressure is detected, the suspension L is discharged and the rotation of the rotating body 10 is stopped. A mechanism is provided.

  More specifically, when the force in the direction of arrow A described above is applied to the scraper 6 by the deposited layer 7, one end (arm connecting portion 48) of the scraper arm 36 supported by the arm support portion 46 is The actuator arm 47 is contracted by being pushed in the B direction. Therefore, this movement can be detected by the pressure detection sensor 38 installed in the scraper displacement portion 37, and the stop control of the centrifugal separation process can be performed.

  Thereby, it is not necessary to adjust the operation stop timing with a timer or the like according to the type of suspension L to be processed, and it is possible to eliminate the need for the operator to constantly monitor the adhesion state of the deposited layer 7.

  Moreover, the scraper peeling mechanism part 18 can set the angle (scraper angle (alpha)) between the scraper 6 in the peeling position SP and the inner wall surface 15 of the rotary body 10 to the range of 100 degrees or more and 150 degrees or less. Here, the scraper angle α will be described in detail. The tangent line S and the scraper with the circular rotator 10 in contact with the proximity point O on the basis of the proximity point O between the scraper end 35 and the inner wall surface 15 of the rotator 10. The angle formed between the scraper side 6 of the plate-like scraper 6 extending from the end 35 is defined as a scraper angle α in the present specification (see FIG. 3). In this embodiment, the scraper angle is set to about 120 ° (see FIG. 3). Accordingly, the accumulated layer 7 (sludge 41) is not scraped and only the surface of the deposited layer 7 is not scraped off, and reliable scraping can be performed. In addition, the displacement of the scraper 6 via the actuator arm 47 by the scraper displacement portion 37 is performed using air pressure in this embodiment.

  In addition, a sludge recovery unit 39 is provided below the opening 19 of the rotating body 10, and the sludge 41 (deposited layer 7) peeled from the inner wall surface 15 can be recovered. The sludge recovery part 39 has a recovery port 40 formed so as to face the opening 19, and has a lid part 42 that allows the recovery port 40 to be opened and closed. Here, the scraper 6 is provided with a drop plate 43 formed substantially vertically along the scraper arm 36 in order to smoothly collect the sludge 41 scraped off by the sludge recovery part 39. That is, there is a possibility that some sludge 41 contains moisture or the like and has a high viscosity. Such a high-viscosity sludge 41 does not fall down in accordance with the gravity even if it is scraped off from the inner wall surface 15, and gradually adheres to the scraper 6 and gradually approaches the center of the inner space 12 such as the scraper arm 36. There is a possibility of gathering. Therefore, a large amount of sludge 41 adheres to the scraper 6 and the scraper arm 36, and it is necessary to finally stop the operation of the centrifugal separator 1 and scrape these manually.

  Therefore, the sludge 41 that has reached the vicinity of the scraper arm 36 can be brought into contact with the drop plate 43 and guided to the recovery port 40. In order to minimize the adhesion to the scraper 6, the surface of the scraper 6 is coated with a fluororesin. Further, the scraper 6 is formed so as to be removable with bolts or the like so as to facilitate replacement due to wear or the like, and further with an adjuster bolt for fine adjustment so as to be close to the inner wall surface 15 while maintaining a predetermined distance. Installed.

  Further, in the centrifugal separator 1 of the present embodiment, the rotating body upper surface portion 23 of the rotating body 10 is provided with a slight inclination so that the low specific gravity liquid phase component 8 derived from the recovery hole portion 24 is outside the rotating body 10. Measures to prevent foaming, measures to reduce vibration during rotation by setting the plate thickness of the rotating body 10 to 6 mm or more, and screws used for the upper surface portion 23 of the rotating body use flat head screws with a smooth head By doing so, various measures are taken to reduce the contact area between the liquid phase component 8 and the screw portion and prevent the generation of bubbles. In addition, in order to suppress vibrations by the drive motor 13 and the low-speed rotation motor 32, anti-vibration rubber 45 is attached to each corner of the basic housing portion 17.

  Next, an example of the centrifugal separation process of the suspension using the centrifugal separator 1 of the present embodiment will be described mainly based on FIG. Here, the flowchart according to FIG. 5 corresponds to the control method 2 of the present invention.

  First, the rotation mechanism unit 3 is controlled, and the rotating body 10 is rotated at high speed using the rotational force of the driving motor 13. Thereby, a centrifugal force is generated in the rotating body 10 formed in a substantially bowl shape from the bottom to the top. Further, the suspension discharge unit 14 is controlled to be interlocked at almost the same timing as the control of the rotation mechanism unit 3, and the suspension L is sprayed from the nozzle 34 toward the inner wall surface 15 of the rotating body 10. (Centrifugation step S1). Thereby, the suspension L that has reached the vicinity of the inner wall surface 15 of the rotating body 10 in which the centrifugal force is generated from the bottom to the top by high-speed rotation is separated for each component having a different specific gravity by the centrifugal force, The solid phase component 9 having a high specific gravity adheres to the inner wall surface 15, and the liquid phase component 8 having a low specific gravity gradually moves along the inner wall surface 15 of the rotating body 10 by the centrifugal force acting from the bottom to the top. The unit 23 is reached.

  A plurality of recovery hole portions 24 are formed in advance on the rotating body upper surface portion 23. The liquid phase component 8 that has reached the upper surface 23 of the rotator is guided out of the rotator 10 through the recovery hole 24 and is collected in a recovery unit (not shown) for low specific gravity components provided in the basic casing 17. To be recovered. At this time, an air flow W is generated toward the rotating body 10 from the vicinity of the bearing portion 27 that pivotally supports the rotating shaft 4 connected to the rotating body upper surface portion 23. The air flow W is caused by the fins 5 attached to the rotating shaft 4, thereby preventing the mist-like liquid phase component 8 led to the outside from the recovery hole portion 24 from moving toward the inside of the rotating mechanism portion 3. be able to. That is, the liquid phase component 8 that is going to rise upward by centrifugal force can be pushed back by the airflow W. Note that when the air flow W reaches the connecting portion between the rotating body upper surface portion 23 of the rotating body 10 and the rotating shaft 4, the flow direction changes toward the side circumferential direction of the rotating body 10. Therefore, the liquid phase component 8 is not pushed back into the inner space 12 of the rotator 10 again from the recovery hole 24, and conversely, the liquid phase component 8 can be sucked from the inner space 12 and sent to the recovery portion. it can. As a result, the liquid phase component 8 adheres to the rotation mechanism unit 3, and rust is not generated, or a problem that hinders the smooth rotation of the rotating body 10 does not occur.

  In the centrifugal separation step S1, the scraper 6 is set at the separation position LP of the inner space 12 of the rotating body 10. Then, the discharge of the suspension L is continued, and when the sludge 41 due to the solid phase component 9 is deposited and the thickness of the deposited layer 7 gradually increases, the deposited layer 7 finally comes into contact with the scraper 6. . Here, as described above, the scraper peeling mechanism portion 18 is provided with the pressure detection sensor 38 that detects the pressure applied to the scraper 6. Therefore, the centrifugal separator 1 detects this pressure (pressure detection step S2). Here, when the pressure with respect to the scraper 6 is detected (YES in the pressure detection step S2), the discharge of the suspension L by the suspension discharge unit 14 is stopped (suspension stop step S3). On the other hand, when the pressure with respect to the scraper 6 is not detected (NO in the pressure detection step S2), the centrifugation step S1 is continued. Here, the pressure detection by the pressure detection sensor 38 is a case where the pressure detection sensor 38 receives a pressure equal to or higher than a preset threshold value, and the scraper 6 is slightly discharged by the discharge of the suspension L. If the scraper 6 is only shaken, or if the pressure is applied to the scraper 6 by the wind pressure due to the rotation of the rotating body 10, the suspension stop step S3 is not performed.

  Then, only high-speed rotation of the rotating body 10 is executed for a predetermined time (for example, 20 minutes) in a state where the discharge of the suspension L is stopped (dehydration step S4). Here, the sedimentation layer 7 (sludge 41) that has been centrifuged from the suspension L and adhered to the inner wall surface 15 is immediately after the separation, and therefore may contain a large amount of liquid phase components 8 such as moisture. . Therefore, by continuing the rotation of the rotating body 10 at a high speed even after the suspension L is stopped, the same action as the dehydration of the washing machine can be exerted on the deposited layer 7. That is, the centrifugal force continues to act by the rotating body 10 that continuously rotates at a high speed, and the liquid phase component 8 contained in the deposited layer 7 also receives this action. As a result, in the deposited layer 7, the dried solid phase component 9 containing almost no liquid phase component 8 is strongly pressed against the inner wall surface 15, while the solid phase component 9 containing the liquid phase component 8 having a low specific gravity. Exists near the surface of the deposited layer 7. Then, the liquid phase component 8 in the vicinity of the surface reaches the recovery hole 24 of the upper surface portion 23 of the rotating body by receiving the centrifugal force from the bottom to the top again. That is, a dehydration process is performed in which the liquid phase component 8 is further squeezed out from the deposited layer 7 that has been centrifuged. And after spin-drying | dehydration is completed completely, the high speed rotation of the rotary body 10 is stopped (rotary body stop process S5).

  And the scraper peeling mechanism part 18 is controlled, and the scraper 6 located in the separation position LP is moved to the peeling position SP. At this time, since the deposition layer 7 mainly composed of the solid phase component 9 exists on the inner wall surface 15 of the rotator 10, even if only the displacement of the scraper 6 is performed, the scraper end of the scraper 6 is placed on the deposition layer 7. There is a case where the subsequent movement stops or the smooth peeling process cannot be performed only by the biting of the portion 35.

  Therefore, the clutch mechanism (not shown) is switched to drive the low-speed rotation motor 32 (low-speed rotation step S6). Thereby, the rotating body 10 rotates without generating a large centrifugal force. At this time, the scraper displacement portion 37 gradually moves the scraper 6 from the separation position LP to the peeling position SP (scraper displacement step S7). As a result, the scraper end portion 35 gradually comes into contact with the deposited layer 7 and scrapes off the sludge 41 from the inner wall surface 15 while scraping off the uppermost layer of the deposited layer 7 little by little as the rotating body 10 rotates (scraping). Step S8). In addition, when the sludge 41 which comprises the deposition layer 7 is comprised with a comparatively soft substance, you may displace the scraper 6 to the peeling position SP simultaneously with the above-mentioned low-speed rotation process S6.

  Thus, the sludge 41 scraped by the scraper 6 is collected through the collection port 40 to the sludge collection unit 39 using the drop plate 43 or the like.

  Thereafter, after most of the sludge 41 of the rotating body 10 is scraped off, a cleaning liquid (not shown) containing water or a surfactant is ejected onto the inner wall surface 15 of the rotating body 10 (cleaning step S9). Such a configuration is not particularly described in detail. For example, a liquid supply pump that provides a cleaning liquid storage tank (not shown) having the same configuration as the suspension storage tank that stores the suspension L, and further pumps the suspension L by pressure. By switching the above, the cleaning liquid in the cleaning liquid storage tank can be ejected through the suspension supply pipe 33 and the nozzle 34. Thereby, the sludge 41 slightly adhered to the inner wall surface 15 can be washed away. As a result, a state where no sludge 41 is attached to the inner wall surface 15 of the rotating body 10 is created.

  Thereby, using the centrifugal separator 1 of the present invention, the centrifugal separation process, the dehydration process, the scraping process, and the cleaning process can be executed in a series of flows.

  As described above, the centrifugal separator 1 of the present embodiment is fixed and has a rotating mechanism 3 (excluding the drive motor 13 and the like) and a rotating body 10 as compared with the conventional type in which maintenance work cannot be easily performed. Can be attached to or detached from the basic casing 17 integrally or independently. As a result, maintenance such as overhaul of the centrifuge 1 and cleaning work can be easily performed.

  In addition, the centrifugal separator 1 of the present embodiment can generate the air flow W by the fins 5 attached to the rotating shaft 4 so that the mist of the liquid phase component 8 does not enter the rotating mechanism unit 3. . Thereby, the stable rotation of the rotary body 10 can be maintained over a long period of time.

  Furthermore, by providing the scraper 6 with the pressure detection sensor 38, it is possible to detect the accumulation state of the deposited layer 7, and to recognize the timing of starting scraping by the scraper 6. As a result, as compared with the conventional method of grasping the start timing based on uniform judgments such as operator judgment and timers, the process shifts to a scraping process at an appropriate time according to the type of suspension L to be processed. It becomes possible. As a result, the separation process of the suspension L can be executed with the separation efficiency being in an optimum state.

  Furthermore, by the control method 2 of the centrifugal separator 1 of the present embodiment, dehydration can be performed to further separate the liquid phase component 8 such as moisture from the sludge 41 of the solid phase component 9 on which the deposition layer 7 is formed. Thereby, volume reduction and weight reduction of the sludge 41 collect | recovered by the sludge collection | recovery part 39 can be aimed at.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And design changes are possible.

  That is, in the centrifugal separator 1 of the present embodiment, as the air flow generation means, the one that generates the air flow W with the fins 5 using the rotational force of the rotating shaft 4 is shown, but is not limited to this. Anything can be used as long as it can prevent the intrusion. For example, you may provide the structure which supplies air from an air pump compulsorily and continuously along the rotating shaft 4. FIG. Furthermore, the shape of the rotating body 10 is not particularly limited, and it is possible to appropriately select one used for a general centrifugal separator.

It is a schematic cross section which shows schematic structure of the centrifuge of this embodiment. It is explanatory drawing which shows the structure of the fin attached to the rotating mechanism part isolate | separated, the rotary body, and the rotating shaft. It is explanatory drawing which shows an example of the scraper in a peeling position. It is explanatory drawing which shows an example of the detection of the deposit layer by the scraper in a separation position. It is a flowchart which shows the flow of a process of the control method of this embodiment.

Explanation of symbols

1 Centrifuge 2 Control method (Centrifuge control method)
3 Rotating mechanism 4 Rotating shaft 5 Fin (Airflow generating means)
6 Scraper 7 Deposited layer 8 Liquid phase component (low specific gravity component)
9 Solid phase components (high specific gravity components)
DESCRIPTION OF SYMBOLS 10 Rotating body 11 Lower end shaft part 12 Inner space 13 Drive motor 14 Suspension discharge part 15 Inner wall surface 16 Rotating body accommodation space 17 Basic housing part 18 Scraper peeling mechanism part 19 Opening part 23 Rotating body upper surface part 33 Suspension Supply pipe 34 Nozzle 35 Scraper end portion 36 Scraper arm 37 Scraper displacement portion 38 Pressure detection sensor S1 Centrifugation step S2 Pressure detection step S3 Suspension stop step S4 Dehydration step S5 Rotating body stop step S6 Low speed rotation step S7 Scraper displacement step S8 Scraping process S9 Cleaning process LP Separation position SP Peeling position L Suspension W Airflow α Scraper angle

Claims (5)

A generally bowl-shaped rotating body disposed with the opening facing downward;
A rotating shaft having a driving motor for rotating the rotating shaft in the axial direction and generating a centrifugal force in the inner space of the rotating body;
It is connected to suspension liquid feeding means for pumping a suspension in which different specific gravity components to be centrifuged are mixed, so that the inner space of the rotating body is along the rotating shaft from above the rotating body. A suspension supply pipe to be supplied, and a nozzle having a discharge port provided in the inner space, connected to the suspension supply pipe, and the inner space of the rotating body rotated by the rotating mechanism A suspension discharge section for discharging the suspension;
A scraper having a scraper end portion at least partially matching the shape of the inner wall surface of the rotating body, and capable of scraping off the accumulated layer of the suspension deposited on the inner wall surface by centrifugation by the rotating body; A scraper support arm that is inserted into the inner space from below the rotating body through the opening and supports the scraper in the inner space, and an end portion of the scraper are brought close to the inner wall surface, and the deposited layer is scraped. And a scraper peeling mechanism having a scraper displacement portion that is displaced between a peeling position to be removed and a separation position separated from the inner wall surface,
The rotation mechanism unit is
The centrifuge according to claim 1, wherein the rotary shaft is formed so as to be detachable from the drive motor and the rotary body, and the rotary shaft and the rotary body are formed so as to be removable from above. . The rotation mechanism unit is
2. The centrifuge according to claim 1, further comprising an airflow generating unit configured to generate an airflow that flows from an upper side toward a lower rotating body along an axial direction of the rotating shaft that is rotated by the driving motor. Separation device. The scraper peeling mechanism is
A pressure detection sensor for detecting pressure on the scraper;
The scraper displacement portion displaces the scraper to the spaced position separated from the inner wall surface by a distance that matches the maximum allowable layer thickness of the deposited layer,
When the deposited layer is deposited on the inner wall surface of the rotating body and reaches the maximum allowable layer thickness, the deposited layer and the scraper come into contact with each other, and the movement of pressing the scraper toward the center of the rotating body is performed. The centrifugal separator according to claim 1 or 2, wherein detection is performed by a pressure detection sensor, and the driving of the rotating body and the supply of the suspension are stopped and controlled. The scraper angle of the scraper with respect to the inner wall surface of the rotating body is:
The centrifuge according to any one of claims 1 to 3, wherein the centrifuge is set to 100 ° or more and 150 ° or less. A method for controlling a centrifuge using the centrifuge described in any one of claims 1 to 4,
The rotation mechanism unit and the suspension discharge unit are interlocked to discharge the suspension into the inner space of the rotating body, and deposit a deposition layer separated from the suspension by centrifugal force on the inner wall surface. A centrifuge process,
The suspension discharge by the suspension discharge unit is stopped, the rotating mechanism unit is controlled to rotate the rotating body, and a centrifugal force is applied to reduce the amount of water component contained in the deposited layer. A dehydration step of separating and removing specific gravity components;
A scraping step of controlling the scraper peeling mechanism and scraping the dehydrated deposited layer from the inner wall surface of the rotating body using the scraper;
And a cleaning step of cleaning the sludge remaining on the inner wall surface from which the deposited layer has been scraped off.

Images