JP2016013512A - Working state output device of exhaust device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working state output device of an exhaust device which can grasp a working state and a use environment of an exhaust device, in particular, makes a maintenance operation efficient by reducing the number of times of determination for inspecting elements of an exhaust fan, a hanging wire and the like and, at the same time, can suitably perform specification of the element as a maintenance object, that is, decision (prediction) of maintenance time from a tendency of the working state.SOLUTION: A working state output device of a fume hood 1 which sucks air from an opening 8 formed by a lifting door 6 to an operation space 3 and exhausts air in the operation space 3 by means of an exhaust fan 33 includes: working data detection means 6b, 32b for detecting working data which exhibit a working state of the fume hood 1; a working data storage device for storing working data detected by the working data detection means 6b, 32b; and a working state output means which can output the working data on a period T1 between at least selected two times from the working data storage device 32.

Description

  The present invention relates to an operating state output device of an exhaust device that is provided in an indoor space of a research facility or the like and forcibly exhausts gas or odor generated by an experiment. Here, the exhaust device includes a fume hood, a local exhaust device, a table hood, a simple hood, a safety cabinet, a biohazard cabinet, a green bench, and the like.

  Patent Document 1 discloses a technique related to a fume hood. A conventional fume hood is generally provided with a lifting door that is movable in the vertical direction in order to partition a work space provided in the fixture body and a user. Such a lift door is often configured by connecting a weight separately provided in the fixture main body and the door main body with a suspension wire via a pulley provided on the upper portion of the fixture main body, and taking balance. In this structure, it is necessary to support the load of the lifting door and weight with a wire, so it is necessary to perform maintenance regularly to monitor the breakage of the wire and replace the hanging wire according to the situation there were. However, in order to maintain the user's convenience, the front of the fume hood must be secured as a work space for the user, and the weight, pulley, and suspension wire should be located at the side and rear of the fume hood. In many cases, the maintenance workability is not always good. During regular maintenance of the fume hood, the hanging wire is visually inspected for abnormalities in appearance, wear, and wire breakage. If an abnormality was found as a result of the inspection, the hanging wire was exchanged. Even if no abnormality was found in the hanging wire, the hanging wire was exchanged for safety when the usage period was long.

  In addition, the fume hood needs to be operated at a surface wind speed at the front opening of the work space always higher than a predetermined value in order to ensure the safety of the user. Patent Document 2 discloses a technique for periodically maintaining the wind speed sensor and calibrating the output value so that the output of the control wind speed sensor does not deviate from the actual wind speed due to dirt or aging. ing. On the other hand, when operating a fume hood, the surface wind speed may decrease due to factors such as damage to the exhaust fan or the motor that drives the exhaust fan, damage / contamination of the exhaust duct pipe, and clogging of the filter.

Japanese Patent No. 3553355 (page 4, FIG. 5) JP-A-8-294737 (paragraph 0021-paragraph 0022, FIGS. 1-5)

  In the conventional periodic inspection, since abnormality of the hanging wire is performed by visual inspection, it may be difficult to find the abnormality. Moreover, since the exhaust fan and the electric motor that drives the exhaust fan are damaged, the exhaust duct is damaged or contaminated, and the filter is clogged by visual inspection, it may be difficult to find an abnormality. These factors that cause abnormalities are often in places where confirmation is difficult, such as the side and rear of the fume hood, and there is a problem that maintenance workability deteriorates. Further, although clogging of the filter is inspected based on the usage time, the usage environment alone may not necessarily match the usage environment. Thus, conventionally, there has been a problem that the operating state of the fume hood and the use environment are insufficiently grasped. As a result, many tests depended on experience and intuition.

  The present invention has been made paying attention to such a problem, and an object of the present invention is to provide an operating state output device for an exhaust device capable of grasping the operating state and use environment of the exhaust device. In particular, the efficiency of maintenance work is reduced by reducing the number of times of confirmation for inspecting elements such as exhaust fans and suspension wires, etc., and the elements to be maintained are determined from the trend of the operating state, that is, the maintenance time is determined ( An object of the present invention is to provide an operating state output device for an exhaust device that can suitably perform (prediction).

In order to solve the above-described problem, the exhaust gas exhaust system operating state output device of the present invention includes:
An exhaust device operating state output device that sucks air into the work space from an opening and exhausts the air in the work space with an exhaust fan,
Operation data detection means for detecting operation data indicating the operation status of the exhaust device;
An operation data storage device for storing operation data detected by the operation data detection means;
It is characterized by comprising operating state output means capable of outputting the operating data between at least two selected times from the operating data storage device.
According to this feature, it is possible to grasp the operating state and use environment of the exhaust device between two times. For example, the maintenance time of the exhaust device can be determined based on the grasp.
Here, the operating state is the actual operating state of the exhaust device, for example, surface wind speed, and the use environment is the environment in which the exhaust device is used, and factors that affect its use, such as the room in which it is installed Is a clean room.

The exhaust device operating state output device of the present invention,
The two selected times are characterized in that one of the times is the time when the exhaust device is newly installed, and the other time is the time when the first data sampling of the exhaust device is performed.
According to this feature, the initial state when the exhaust system is newly installed has accurate data as the characteristic data of the exhaust system without any deterioration over time or contamination, so that the operating state and use environment of the exhaust system can be grasped more accurately. .

The exhaust device operating state output device of the present invention,
The operation data output result between the two selected times is compared with a reference value, and the next maintenance time of the exhaust device is determined.
According to this feature, a maintenance time can be proposed in accordance with the operating state of the exhaust device and the use environment.

The exhaust device operating state output device of the present invention,
The exhaust device includes the operation data detection unit, the operation data storage device, and an operation state output unit, and the operation state output unit is a transmission unit that transmits operation data,
A display device is provided that receives the operation data transmitted from the transmission means, converts the operation data into a format that can be visually recognized as at least one of the operation state and use environment of the exhaust device, and displays it on a screen. To do.
According to this feature, it is possible to easily grasp the operating state and use environment of the exhaust device. The display device may be provided in the exhaust device or may be provided outside the exhaust device.

The exhaust device operating state output device of the present invention,
The operating data storage device stores, together with time, data that exceeds the first threshold value of the operating data output by the operating data output means to the abnormal side.
According to this feature, it is possible to grasp a trend of an abnormal tendency that occurs because time data is also included.
Here, exceeding the abnormal side means exceeding the small side when the abnormal standard is smaller than the current value (for example, exhaust wind speed is insufficient). When it is on the larger side than the current value (for example, the lifetime is applicable), it means that it is over the larger side.

The exhaust device operating state output device of the present invention,
The exhaust device has warning means for warning when the operation data exceeds the second threshold value on the abnormal side during use,
The first threshold value is a value on the normal side with respect to the second threshold value.
According to this feature, since the first threshold value is a value on the normal side of the second threshold value used for the alarm, it is possible to accurately estimate the operating state and use environment of the exhaust device.

In addition to the above, the exhaust device operating state output device according to an aspect of the present invention includes:
The exhaust device is of a constant air volume exhaust type,
The operation data detection means is a wind speed sensor that detects a wind speed in a work chamber or an exhaust duct of the exhaust device,
Comparing the wind speed of a predetermined part (part such as an opening or an exhaust duct) obtained using a constant exhaust air volume with the wind speed at the predetermined part obtained from the detection data of the wind speed sensor, It is characterized by estimating the usage environment.
According to this feature, since the operating state and use environment of the exhaust device can be estimated using the wind speed sensor, no other additional sensor is required.

In addition to the above, the exhaust device operating state output device according to an aspect of the present invention includes:
The exhaust device is of a variable air volume exhaust type,
The operation data detection means is a wind speed sensor that detects a wind speed in a work chamber or an exhaust duct of the exhaust device,
It is obtained from the wind speed of a predetermined part (part such as an opening or an exhaust duct) obtained by using the variable air quantity of the means (exhaust fan or damper in the exhaust duct) for realizing the variable exhaust air quantity and the detection data of the wind speed sensor. It compares with the wind speed in the said predetermined part, and the operating state of a said exhaust apparatus and a use environment are estimated.
According to this feature, since the operating state and use environment of the exhaust device can be estimated using the wind speed sensor, no other additional sensor is required.

In addition to the above, the exhaust device operating state output device according to an aspect of the present invention includes:
The exhaust ducts of a plurality of exhaust devices are connected to one exhaust fan via one exhaust manifold,
The operation data detection means is a wind speed sensor that detects a wind speed in a work chamber or an exhaust duct of the exhaust device,
The display device collects operation data of the plurality of exhaust devices and displays them in order of maintenance timing.
According to this feature, the maintenance time of each exhaust device can be matched by using a large-capacity filter for the exhaust device having a high maintenance frequency.

In addition to the above, the exhaust device operating state output device according to an aspect of the present invention includes:
The display device is characterized in that, for the elements that require maintenance of the exhaust device, the elements that require maintenance are displayed, in particular, arranged in order from the current time.
According to this feature, it is possible to grasp the time when maintenance is required for each element, so it is possible to select a timely maintenance time according to the operating status and usage environment. It is easy to grasp because they are displayed side by side in close order.

It is a perspective view which shows the operation state output apparatus of the fume hood in Example 1. FIG. It is a figure which shows the screen of the tablet terminal in Example 1. FIG. FIG. 3 is a block diagram illustrating functions of a control unit according to the first embodiment. This relates to the surface wind speed in Example 1, (a) is a diagram for explaining the storage state of the surface wind speed, (b) is a display image of information related to the surface wind speed. It is another display image of the information relevant to the surface wind speed in Example 1. It is a figure explaining the coefficient according to the working time per day in Example 1. FIG. It is a figure explaining the coefficient according to the cumulative operation time and drive power of the exhaust fan in Example 1. FIG. 1 is a front view of a fume hood in Example 1. FIG. It is a side view which cuts out the fume hood in Example 1 partially. It is a figure explaining the memory | storage state of the frequency | count of opening / closing of the raising / lowering door in Example 1. FIG.

  A fume hood operating state output device according to the present invention will be described with reference to FIGS. A fume hood will be described as an example of the exhaust device. The fume hood 1 has a work space 3 inside the fixture body 2, and an exhaust port 4 connected to an exhaust device 30 for exhausting the air in the work space 3 is provided in the upper portion of the fixture body 2. Yes. Note that the pedestal provided below the work space 3 of the fixture body 2 is not shown. The exhaust device 30 includes a dry scrubber 31 having an activated carbon filter connected to the exhaust port 4, an exhaust duct 32 provided through the wall 34 of the room and connected to the dry scrubber 31, and connected to the exhaust duct 32 provided outside the room. The exhaust fan 33 is configured. Further, the exhaust fan 33 has a fan pulley and a motor pulley connected via a V-belt, and the motor is PWM-controlled by an inverter.

  A fixed glass plate 5 made of tempered glass or the like is fixed above the front side of the fixture body 2. In addition, an elevating door 6 that is raised and lowered to open and close the opening 8 of the fixture body 2 is provided below the fixed glass plate 5. Further, the elevating door 6 has an elevating glass plate 7 made of tempered glass or the like like the fixed glass plate 5, and a gripping piece to be held by a user is provided at the lower end edge of the elevating glass plate 7. 6a is attached. The user can open and close the opening 8 of the fixture body 2 by grasping the grip piece 6a and raising and lowering the lift door 6. FIG. 1 shows a state in which the elevating door 6 is raised by about one third.

  In conducting the experiment, the operation button 25 is operated, the exhaust fan 33 and the illumination (not shown) are activated, the elevator door 6 is raised to a desired position, and a hand is inserted from the opening 8 in the work space 3. Experiment with volatile chemicals. The control unit 50 inputs an elevation position (L) signal from the door position sensor 6b (operation data detection means) that detects the elevation position, and multiplies the width W of the opening 8 stored in the storage unit 52 in advance. An opening area S (= L × W) of the opening 8 is obtained (step 1). From this opening area S, a period (pulse width) for PWM control of the motor of the exhaust fan 33 for realizing the surface wind speed of 1.0 m / s, which is a target value in the opening 8, is obtained (step 2). The electric motor is controlled (step 3). The surface wind speed, which is the target value, may be set in advance, or an appropriate value corresponding to the medicine to be used may be input from the operation button 25. In any case, it may be set in consideration of legal regulations, for example, 0.5 m / s or more, the medicine to be used, the power consumption of the motor, and the like.

  Further, when the control unit 50 of the fume hood 1 receives the request signal 100A from the tablet terminal 100, it returns the operation data of the fume hood 1 as a response signal 1A. The tablet terminal 100 may be a terminal dedicated to fume hoods or a general-purpose terminal that installs and uses an application.

  Next, the screen of the tablet terminal 100 will be described. In the home screen shown in FIG. 2A, icons of “product information”, “surface wind speed”, “history”, and “maintenance” are displayed, and each icon can be operated by touching a GUI ( It functions as a graphical user interface. By touching each icon, the screen is switched to the screens of FIGS. 2B to 2E.

  FIG. 2B is a screen showing product information, and displays information such as the code of the fume hood 1, the production lot number, and the version of software installed on the tablet terminal 100. FIG.2 (c) shows the present value by the surface wind speed and the trend by a graph. Even if the fume hood 1 does not have a surface wind speed display function, the surface wind speed can be grasped and used as a monitor. In addition, since the current value is indicated by a number together with the graph, the current surface wind speed and its trend can be grasped intuitively.

  2 (d-1) and (d-2) are screens showing the history, and the screen shown in FIG. 2 (d-1) is the cumulative operating time of the fume hood 1 (for example, the cumulative operating time of the exhaust fan 33). ), The cumulative movement distance of the wire that suspends the lifting door 6, and the screen shown in FIG. 2D-2 is the surface wind speed at the opening 8 between two selected times (details will be described later). The surface wind speed average, standard deviation σ, warning value, and number of caution values are displayed. By showing the history, it is possible to grasp the operating status and usage environment.

  FIG. 2 (e) is a screen showing the maintenance timing, and shows for each element the prediction of how many months from now the maintenance is required. In this prediction, by comparing the operation data with the reference value, it becomes possible to specify in advance the elements of the fume hood 1 that need to be replaced. In addition, on this screen, elements requiring maintenance are arranged in order from the current time, so that it is easy to grasp.

  In addition, it is preferable that the periodical maintenance is 6 months, and an element that requires maintenance in a shorter period of time, in this case, the filter is displayed in a display that can be distinguished from other elements such as highlights and different colors. By doing so, it is possible to strongly urge the user to replace the filter after three months shown in FIG. It can also be seen that the cleaning including the exhaust duct 32, which is difficult for the user to handle, is eight months later. For this reason, if the user replaces the filter, the next periodic maintenance can be changed to 8 months instead of the usual 6 months, and timely maintenance can be performed according to the operating status and usage environment. . In addition, it is natural to select in the range which does not exceed the period defined by law, for example, 12 months. For this reason, those indicating a maintenance period longer than 12 months are displayed as 12 months or more. Instead of this, “30 months later” or the like actually obtained by calculation may be displayed.

  Referring to FIG. 3, a control unit 50 includes an arithmetic processing unit 51 having a CPU, a storage unit 52 having a flash memory for storing various data, an input unit 53 for inputting signals (data) from sensors, etc., an external tablet The transmitter / receiver 54 (operating state output means) that performs wireless communication with the terminal 100 is configured. The input unit 53 receives, from the input port 53a, a wind speed signal of the wind speed sensor 32b provided in the exhaust duct 32, a drive signal (PWM signal) of the motor of the exhaust fan 33, in addition to the door lift position signal of the door position sensor 6b. input. The door position sensor 6b, the wind speed sensor 32b, and means for outputting this drive signal are operation data detection means.

  Next, an example of a procedure for causing the arithmetic processing unit 51 to store data in the storage unit 52 will be described. Referring to FIG. 5, the time t1 is the time when the fume hood 1 was newly installed and started operation, 12:00 December 20, 2013, and the time t2 is the time 2014 when the first data sampling is performed 6 months after the time t1. It is 12:00 on June 20th. Here, data sampling means sampling of operation data between two selected times. For example, since data sampling is performed at the time of regular maintenance, the time at regular maintenance will be described as an example at the time of data sampling. Times t3, t4, and t5 are times six months after the times t2, t3, and t4, respectively. Here, two adjacent times that are intervals of the regular maintenance are the two selected times. Further, T1, T2, T3, and T4 are between two selected times (hereinafter also simply referred to as sections).

  4 and 5, the current time is the time t2 at the time of the regular maintenance, and the operating state relates to the surface wind speed at the opening 8. The tables 8T1, 8T2, 8T3, and 8T4 have two selected times, respectively. Data in T1, T2, and T3 is stored. Since the current time is time t2, data is stored only in the table 8T1. The second threshold value 8ref2 of the surface wind speed is 0.5 m / s, and if it is less than this (a value on the abnormal side), it is a value A that gives a warning by flashing a part of the indicator 13 in red. The first threshold value 8ref1 is greater than the second threshold value 8ref1 (normal value) and is not less than 0.5 m / s and less than 0.6 m / s, and is a value B to be noted. The value A to be alarmed and the value B to be noted are stored in the form of the table 8T1 together with the time as values related to elements that are highly likely to cause a failure. The surface wind speed may be stored together with the time, for example, every minute. However, it is preferable to store only values related to elements that are likely to cause a failure because the area that occupies the storage unit 52 is small.

  Further, in order to display the history on the tablet terminal 100, in addition to the table format of FIG. 4A, the operation data for each section shown in FIG. 4B and the format of the time series graph shown in FIG. And from the viewpoint that it is easy to grasp the trend. The calculation for conversion to such a display format may be performed by the calculation processing unit 51 and the result stored in the storage unit 52, or the operation data that is the basis of the calculation may be stored in the storage unit 52. The operation data may be transmitted as a response signal to the tablet terminal 100 (1A), and the calculation unit of the tablet terminal 100 may perform an operation for conversion to the display format. FIG. 5 is a display in a form in which the value A for warning and the value B to be noted are plotted together with the first threshold value 8ref1 and the second threshold value 8ref2 among the surface wind speeds in the section T1, so the surface wind speed at any point in time is displayed. It is easy to grasp whether it was deficient or deficient.

  FIG. 4 (b) shows the value A for warning, the number of values B to be noted, the average surface wind speed in the section, and the standard deviation σ of the surface wind speed in the section as types in the section T1. The type can be obtained as described above. The average surface wind speed is an average of the surface wind speeds obtained from the relationship between the wind speed signal from the wind speed sensor 32b and the opening area S. Since this surface wind speed is feedback-controlled so as to be the target surface wind speed, it is substantially equal to the target surface wind speed if there is no abnormality. Further, by obtaining the standard deviation σ of the surface wind speed obtained from the relationship between the wind speed signal from the wind speed sensor 32b and the opening area S, the variation in the surface wind speed can be grasped.

  Further, since the number of values A to be alarmed and the value B to be noted is shown as the type, whether or not the target value of the surface wind speed is appropriate, contamination of the sensors 6b and 32b and the exhaust duct 32 due to aging, exhaust fans It can be used for predictive judgment of maintenance such as 33 performance degradation. For example, the maintenance time can be predicted by comparing the number of times, the average value, and the standard deviation σ with a reference value that is experimentally held in advance. Here, in order to predict the maintenance time, in addition to the value A for giving an alarm to the indicator 13, a value B to be noted which is a value larger than this value (that is, a value on the normal value side) is also used. Excellent prediction accuracy.

  Next, one method of prediction will be described by taking the filter replacement time as an example. Replacement reference data relating to the standard replacement time of the filter is stored in the storage unit 52. This exchange reference data includes the type of room in which the fume hood 1 is installed, that is, the coefficient K1 regarding whether it is a general room or a clean room, the coefficient K2 regarding the target surface wind speed, the surface wind speed (the area of the wind speed sensor 33 and the opening 8). Coefficient K3 regarding the standard deviation of the value obtained from the relationship), coefficient K4 regarding the operating time per day (the time during which the exhaust fan 33 is controlled to achieve the target surface wind speed), and the error rate (the error is described above) The coefficient K5 related to the value A and the value B) and the coefficient K6 related to the driving power of the exhaust fan 33 per unit time are obtained experimentally in advance. Multiplying these coefficients by the standard December, the replacement time (month) = K1 x K2 x K3 x K4 x K5 x K6 x 12 months (Formula 1) predicts how many months later the exchange will be required can do.

  The coefficient K1 may be set in advance to a value corresponding to the room when the fume hood 1 is installed. The other coefficients K2 to K6 are coefficients obtained by operating the fume hood 1 according to its operating state and usage environment.

  Here, the coefficient K1 is affected by the dust in the room, so that the filter life is affected. For example, the coefficient K1 is 1.0 for a general room and 2.5 to 4.0 for a clean room depending on the class. It is. The coefficient K2 is such that the higher the target surface wind speed, the shorter the life of the filter. Therefore, the coefficient K2 is 0.8 when the target surface wind speed is 1.5 m / s, 1.0, 0.8 m / s when the target surface wind speed is 1.0 m / s. When s, it is 1.2 m / s. The coefficient K3 is estimated to be 1.0 and σ = 0.3 when σ = 0.3 or less because the surface wind speed varies as the standard deviation of the surface wind speed increases and the lifetime of the filter is shortened. 0.9 when exceeding.

  The coefficient K4 indicates that the longer the operating time per day, the shorter the life of the filter. When operating for the same time, the continuous operation may have less effect on the filter, such as continued experimentation and temporary storage of chemicals. Therefore, as shown in FIG. 6, 1.5 when the operating time per day is 2 hours, similarly 1.0 when 6 hours, 0.5 when 12 hours, 0.2 when 24 hours. It is. The coefficient K5 is a factor that causes an error because the fume hood 1 itself is often caused by improper work by an unfamiliar user or a change in the environment of the room such as an air conditioner, in addition to aged deterioration and breakdown of the fume hood 1 The higher the value, the smaller the coefficient. For example, the value A is weighted twice as much as the value B, and the sum is 1.0 when the sum is 3 or less, and 0.9 or 10 when the sum is 4 or 10 times. If it is more than once, it is 0.7.

  The coefficient K6 relates to the driving power of the exhaust fan 33 per unit time, and is corrected based on a deviation from a reference value when a certain operation time has elapsed. FIG. 7 shows a reference value of the driving power with respect to the accumulated operation time when the opening ratio of the opening 8 is 1/3, 1/4, and 1/6. It operates for t7 hours in a state where the opening ratio is 1/3, and the drive power of the exhaust fan 33 at this time (drive power per unit time = drive power amount / operating time) is determined from the command value of PWM control of the inverter of the exhaust fan 33 Ask. If the obtained drive power W1 is larger than the reference value W0, it is assumed that there is a lot of dust in the room, chemicals that require a lot of filtration are used, etc., and from 1.0 depending on the deviation Is also a small value. When the obtained drive power is the same as the reference value W0, it is 1.0, and when it is smaller than the reference value W0, it is set to a value larger than 1.0 according to the deviation. Note that the data shown in FIGS. 6 and 7 are prepared in advance as reference data by experiments or the like.

  For example, the prediction at the time of the first regular maintenance on June 20, 2014 (time t2 in FIG. 2 (d-1)) will be described. The coefficient K1 is 1.0. This is because the fume hood 1 is installed in a general room. The coefficient K2 is 1.0. This is because the average surface wind speed of 1.0 m / s during operation for 6 months (FIG. 2 (d-2)) is equal to the target surface wind speed of 1.0 m / s. The coefficient K3 is 0.9. This is because the standard deviation 0.6 (FIG. 2 (d-2)) of the surface wind speed is larger than the reference 0.3. The coefficient K4 is 0.9. This is because the accumulated operation time for 6 months is 1234 hours (FIG. 2 (d-1)), so the operation time per day is 6.9 hours, which is longer than the standard 6 hours. The coefficient K5 is 0.95. This is because the total number of times of weighting, which is the ratio of errors, is 9, which is more than the standard 3 times. The coefficient K6 is 0.95. The reference value for the drive power amount of the exhaust fan 33 for 6 months when operated for 6 hours per day is 450 kW · h, whereas the drive power amount of the exhaust fan 33 for the actual 6 months is 630 kW.・ It was h. This is because the power per unit time of 0.51 kW (= 630 kW · h / 1234h) is larger than the standard power of 0.41 kW (= 450 kW / (6h * 183 days)).

  When the above coefficients K1 to K6 are applied to Formula 1, the replacement time (month) = 1.0 × 1.0 × 0.9 × 0.9 × 0.95 × 0.95 × December is obtained, which is 8.8. The moon. Since six months have passed since the current time t2, it can be determined that the filter should be replaced after 2.8 months on the assumption that the fume hood 1 will be used in the same manner as the period T1. “March” indicating replacement after three months is displayed on the tablet terminal 100 (FIG. 2E). The number of months to be displayed may be “February” on the safe side.

  In the above, in order to simplify the description, the case where the opening ratio of the opening 8 is constant and the target surface wind speed is constant over the period T1 has been described. The surface wind speed may change, but in this case, the parameters for obtaining the coefficients K2 to K6 may be weighted according to the time of operation under the respective operating conditions. Further, the time when the exhaust duct 32 needs to be cleaned and the time when the exhaust fan 33 is maintained can be estimated (predicted) in the same manner. Maintenance of the exhaust fan 33 includes tension and wear of the V belt between the motor-side pulley and the fan-side pulley, heat generation of the fan and the motor, vibration, abnormal noise, and confirmation of the amount of lubricating oil injected.

  Next, the prediction of the replacement time of the wire that is the suspended wire rod of the lift door 6 will be described. Prior to the description of the prediction of the replacement time, the structure related to the suspension of the door 6 in the fume hood 1 will be briefly described.

  8 and 9 show a state where the elevating door 6 is fully closed. The elevating door 6 is suspended in a state where the left and right lower ends thereof are connected to the suspended wire rods 9 and 9 made of wires or the like. As shown in FIG. 1, a pair of left and right suspension wires 9, 9 that suspend the elevator door 6 are provided on one side (left side in this embodiment) of the fixture body 2 via a plurality of pulleys 10. It is connected to a weight 11 made of a heavy metal plate or the like. By balancing the weight 11 and the lifting door 6 with the same weight, the user can raise and lower the lifting door 6 with a light force.

  The upper position on the front side of the fixture body 2 is covered with a decorative panel 12 that can be opened and closed. Further, by opening the decorative panel 12, maintenance of the control board and the like mounted with the suspended wire rod 9, the pulley 10, and the control base 50 at the upper position of the fixture body 2 can be performed. Furthermore, the decorative panel 12 is provided with a plurality of indicators 13 that indicate the operating state of the fume hood 1 by lighting, blinking, and displaying characters by segments, and a lighting board (not shown) that controls the lighting of the indicators 13 is provided. It is provided on the back side of the decorative panel 12. The right panel on the front side of the fixture body 2 is provided with operation buttons 25 such as a power switch for the fume hood 1 and a power switch for illumination.

  As shown in FIG. 9, the fixed glass plate 5 and the elevating door 6 are held by a pair of left and right rail members 14 provided on the left and right sides of the opening of the fixture body 2. The elevating door 6 is suspended from the suspension wire 9 via a fall prevention device arranged in the rail member 14. This fall prevention device is provided at each of the left and right lower ends of the lift door 6 and operates in an emergency such as when the suspension wire 9 is cut or the suspension wire 9 is detached from the weight 11, and the lift door 6. It is provided in order to prevent the fall.

  In addition, the user inserts his / her hand into the work space 3 and conducts an experiment in a state where the lift door 6 is raised and opened to a predetermined opening amount (about one third). The experiment performed in the work space 3 is performed while operating the exhaust device. Air is supplied into the work space 3 from the opening below the elevating door 6, and the air in the work space 3 is also supplied. Is exhausted through the exhaust port 4. In this way, the air flowing in the work space 3 always flows in one direction, and the gas generated in the work space 3 does not flow backward toward the user.

  Further, when the lift door 6 is opened more than a certain opening amount, the air supply amount flowing from the opening below the lift door 6 exceeds the exhaust amount, and the air in the work space 3 flows backward toward the user side. There is a fear. In order to prevent this, a stopper member 16 is provided for restricting the elevating door 6 from opening beyond a certain opening amount. The stopper member 16 is provided only on the left side of the left and right sides of the opening of the fixture body 2 (see FIG. 2). Further, when cleaning or maintenance in the work space 3 is performed, the restriction state of the lift door 6 can be released by operating the stopper member 16, and the lift door 6 can be fully opened.

  As described above, in order to conduct an experiment in which the user inserts his / her hand into the work space 3 with the elevator door 6 opened to a predetermined opening (about one third), the elevator door 6 is suspended. The soundness of the overhead wire 9 is related to worker safety. Therefore, the fume hood of the present invention can determine the replacement time for determining the replacement time of the suspended wire rod 9 based on the elevation of the front door. Hereinafter, the determination of the replacement time performed by the arithmetic processing unit 51 will be described.

  The pulley rotation detection means 40 for detecting the rotation of the pulley 41 accompanying the movement of the suspended wire rod is provided, and the integrated value of the number of rotations of the pulley 41 or the integrated value of the rotation angle of the pulley 41 from the output of the pulley rotation detection means 40. Is calculated, and the integrated value is compared with the allowable value Nw of the number of rotations of the pulley or the allowable value Lw of the rotation angle of the pulley, and the replacement timing of the suspended wire 9 is determined.

  In order to determine whether the integrated value Ns of the pulley rotation stop or the integrated value Ls of the pulley rotation angle obtained by the pulley rotation detection means 40 has reached the suspension wire replacement time, the pulley rotation stop is determined. It is necessary to obtain the allowable value Nw of the number of rotations and the allowable value Lw of the rotation angle of the pulley. Hereinafter, a method for obtaining the allowable value Nw of the number of rotations of the pulley and the allowable value Lw of the pulley rotation angle will be described.

  The life of the suspended wire rod 9 is determined experimentally because it is difficult to determine theoretically. By repeatedly moving the suspension wire on the pulley while a load is applied to the suspension wire, the integrated value of the number of rotations of the pulley until the suspension wire breaks and the integrated value of the rotation angle of the pulley Seeking individually. Since the load applied to the suspension wire varies depending on the size of the elevator door, the load is also changed, data is collected, and the safety factor is taken into account, the allowable value Nw of the number of rotations of the pulley or the pulley The allowable value Lw of the rotation angle is stored in a database.

  The arithmetic processing unit 51 includes an integrated value Ns of pulley rotation stop or an integrated value Ls of pulley rotation angle, an experimentally obtained allowable value Nw of the number of rotation stops of the pulley 41, or an integrated value of the rotation angle of the pulley 41. When the integrated values Ns and Ls reach the permissible values Nw and Lw, it is determined that it is time to replace the suspended wire rod 9.

  When the arithmetic processing unit 51 determines that the replacement time of the suspended wire rod 9 has been reached, it displays on the indicator 13 that the replacement time has been reached, and notifies the user of the replacement time. Moreover, when it determines with the replacement | exchange time of the suspended | hanging overhead wire 9 having been reached, the alerting | reporting means which issues a warning is provided. In addition to the alarm sound, the alarm can be a warning light or notification by display.

  Further, the arithmetic processing unit 51 calculates the integrated value Ns of the rotation stop of the pulley 41 or the integrated value Ls of the rotation angle of the pulley 41 and the allowable value Nw of the integrated value of the number of rotation stops of the pulley 41 or the rotation angle of the pulley 41. Compared with the allowable value Lw of the integrated value, there is also provided means for displaying the number of times the elevator door is raised or lowered until the suspension wire 9 needs to be replaced. Since the operator can predict in advance when the suspension wire 9 needs to be replaced, it is possible to prepare the suspension wire in consideration of the time when maintenance is required.

  As described above, the arithmetic processing unit 51 determines the replacement timing of the suspended wire based on the integrated value of the number of rotation stops of the pulley 41 or the integrated value of the rotation angle of the pulley 41. It is possible to grasp the replacement time and to ensure the safety of the user. In addition, it is no longer necessary to replace the suspended wire rod in a state where the usage frequency is low as in the conventional case, and the running cost can be reduced.

  In the above description, the calculation processing unit 51 determines the replacement time. However, when requested by the tablet terminal 100 (100A), the transmission / reception unit 54 determines the accumulated value of the rotation stop count of the pulley 41 and the rotation angle. The integrated value may be transmitted (1A), the replacement time may be determined by the tablet terminal 100, and the result may be displayed on the screen of the tablet terminal 100.

  In addition to the above, the arithmetic processing unit 51 obtains the number of times the door 6 is opened / closed, the amount of lifting / lowering, the number of times of cumulative opening / closing, and the cumulative lifting distance from the door lifting / lowering position signal of the door position sensor 6b. The data is stored in the storage unit 52. For example, as shown in FIG. 10, the number of times of opening / closing and the cumulative number of times of opening / closing are stored together with the time. In FIG. 10, a table 6T2 shows that data for 6 months from 12:00 on June 20, 2014 to 12:00 on December 20, 2014 is stored every hour. Since the number of times of opening and closing and the cumulative number of times of opening and closing are stored every hour, if the time is plotted on the horizontal axis and the vertical axis is plotted on the basis of this data, the operating state of the fume hood 1 can be easily grasped. be able to. In FIG. 10, 6T1, 6T2, 6T3, and 6T4 are data in the sections T1, T2, T3, and T4, respectively. Since the current time is time t3, data is stored in tables 6T1 and 6T2. Further, from the viewpoint of reducing the occupancy amount of the storage area of the storage unit 52, only the total value of the number of times of opening and closing in the section T1 and the total value of the cumulative number of times of opening and closing may be stored.

  As described above, the operating state output device for the fume hood 1 of the present invention can output the operating data at any one of the two selected times T1, T2,... From the operating data storage device. Therefore, it is possible to grasp the operating state and usage environment of the fume hood between two times. For example, the next maintenance time of the fume hood can be determined based on the grasp.

  Also, since one of the two selected times is the time t1 when the fume hood 1 is newly installed and the other time is the first maintenance time (data sampling) t2, the fume hood operating state and usage environment can be determined. In addition, it can be grasped by comparison with the initial state. Here, when the fume hood 1 is newly established, it is a time when the performance of the fume hood 1 can be accurately grasped without being contaminated and without aging deterioration of parts. Therefore, the maintenance can be predicted more accurately than when other times are used. In addition, by making it possible to output data indicating the operating state from when the fume hood 1 is newly installed until the first maintenance, it is possible to grasp the operating state and usage environment of the fume hood 1 using this data. Therefore, the maintenance worker can give appropriate advice to the user at the time of the initial maintenance. Moreover, as the time other than the new installation, the time at the time of maintenance of the fume hood 1, particularly the time at the time of maintenance accompanying cleaning is preferable. This is because the operation data obtained from the sensor or the like by the maintenance becomes discrete.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, as the exhaust fan, the variable air volume exhaust type in which the electric motor is controlled by the inverter so as to achieve the calculated target surface wind speed has been described, but the fixed exhaust air volume is fixed, a plurality of constant air volumes It may be switchable. In this case, by comparing the surface wind speed obtained from the exhaust amount of the exhaust fan and the opening ratio of the opening 8 with the surface wind speed obtained from the opening ratio of the wind speed sensor 32b and the opening 8, a coefficient for determining the maintenance time is obtained. You just have to ask for it.

  Further, as a variable air volume exhaust type, a damper capable of adjusting the exhaust flow rate may be provided in the exhaust duct, and the damper opening degree may be adjusted so as to obtain the calculated target exhaust air volume. In this case, a coefficient for determining the maintenance timing is obtained by comparing the surface wind speed obtained from the opening degree of the damper and the opening ratio of the opening 8 and the surface wind speed obtained from the opening ratio of the wind speed sensor 32b and the opening 8. You can do it.

  In addition, although one fume hood is connected to one exhaust fan, a plurality of fume hood exhaust ducts are connected to one exhaust fan via one exhaust manifold. There may be. In this case, since it is common to provide a damper capable of adjusting the exhaust flow rate in the exhaust duct, a coefficient for determining the maintenance time may be obtained for each fume hood in the same manner as described above. In the case of this format, it is preferable to collect operation data of a plurality of fume hoods on a tablet terminal and display them in order of maintenance time. In this way, the maintenance time of each fume hood can be adjusted by using a large-capacity filter for the fume hood having a high maintenance frequency.

  Although the dry type fume hood has been described, a wet type having a wet scrubber may be used. In the case of the wet type, it is preferable to predict the time of cleaning in the adsorbent or the circulation tank by using the operating state of the fume hood and the use environment.

  Further, the two adjacent times that are the intervals of the regular maintenance have been described as the two selected times. However, the two adjacent times are not necessarily the same, and it is not necessary to match the start time of the regular maintenance. However, if the end of regular maintenance is adjusted to one of the two selected times, cleaning or adjustment is often performed during regular maintenance. Time is preferred. In addition, although two times have been described as examples of the selected time, the number may be three or four as long as it is two or more. As the number increases, the storage capacity and calculation load increase, but the accuracy of prediction improves. When selecting between three or more times, the operation data between the two most recently selected times more accurately reflects the current usage environment and operating conditions. It is preferable to weight the operational data between two times more heavily than the operational data between the other two selected times.

  In addition, the periodic maintenance intervals T1, T2,... Are set to 6 months, but it is not necessary to be 6 months, and the intervals T1, T2,.

  Moreover, although the control part 50 demonstrated what communicates with the external tablet terminal 100 wirelessly by the transmission / reception part 54, it has a connection connector and may communicate with the external tablet terminal 100 by a wire communication.

  Further, the operation data is stored in the storage unit 52 of the control unit 50. However, when an input signal input from the sensor or the like by the input unit 53 is periodically or requested by an external device such as a personal computer (not shown). The operation data may be stored in the storage unit of the external device, and the stored data may be output to the tablet terminal 100 or the like. In short, what is necessary is just to be able to output operation data between two selected times of the fume hood 1.

  In addition, although the operation data of each section T1, T2, T3, T4... Is stored in the format of tables 8T1, 8T2, 8T3, 8T4..., 6T1, 6T2, 6T3, 6T4. From the viewpoint of occupying the storage area of the storage unit 52, only the operation data of the immediately preceding one or two sections may be stored.

  In addition, the operation data transmitted from the transmission / reception unit 53 has been described for obtaining the maintenance time, operation state, use environment, and the like of the fume hood 1. However, for example, voice guidance to the user (opening the door) This does not preclude use for guidance that prompts the door to close when the power is turned off.

  In the embodiments, the fume hood is described as an example of the exhaust device, but the present invention is not limited to the opening such as the fume hood, the local exhaust device, the table hood, the simple hood, the safety cabinet, the biohazard cabinet, or the green bench. The present invention can be applied to a device that forcibly exhausts air taken into a work space.

1 Fume hood (exhaust device)
3 Working space 6 Elevating door 6b Door position sensor (operation data detecting means)
8 Opening 13 Indicator (display device)
32b Wind speed sensor (operation data detection means)
33 Exhaust fan 50 Control unit 51 Calculation control unit 52 Storage unit (operation data storage unit)
54 Transmitter / Receiver (Operating status output means)
100 tablet terminal (display device)

Claims (6)

An exhaust device operating state output device that sucks air into the work space from an opening and exhausts the air in the work space with an exhaust fan,
Operation data detection means for detecting operation data indicating the operation status of the exhaust device;
An operation data storage device for storing operation data detected by the operation data detection means;
An operating state output device for an exhaust system, comprising: an operating state output unit capable of outputting the operating data between at least two selected times from the operating data storage device.   2. The two selected times are characterized in that one of the times is a time at which the exhaust device is newly installed, and the other time is a time at the time of the first data sampling of the exhaust device. The exhaust system operating status output device.   3. The exhaust system operation according to claim 1, wherein a next maintenance time of the exhaust system is determined by comparing an output result of operation data between the two selected times with a reference value. 4. Status output device. The exhaust device includes the operation data detection unit, the operation data storage device, and an operation state output unit, and the operation state output unit is a transmission unit that transmits operation data,
A display device is provided that receives the operation data transmitted from the transmission means, converts the operation data into a format that can be visually recognized as at least one of the operation state and use environment of the exhaust device, and displays it on a screen. The exhaust device operating state output device according to any one of claims 1 to 3.   The exhaust according to any one of claims 1 to 4, wherein the operating data storage device stores, together with time, data that exceeds the first threshold value of the operating data output by the operating data output means to the abnormal side. Device operating status output device. The exhaust device has warning means for warning when the operation data exceeds the second threshold value on the abnormal side during use,
6. The exhaust system operating state output device according to claim 5, wherein the first threshold value is a value on a normal side with respect to the second threshold value.

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