JP2005279575A - Clean bench - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clean bench that can quickly annunciate an abnormal situation on alarm action by a control device when a cleanness sensor detects lower cleanness in a working space than a specified value. <P>SOLUTION: The clean bench 1 is equipped with the working space 6 having an opening 4A for inserting fingers therethrough at the front, a blower 11 to supply the working space 6 with clean air through a high-performance filter 9 for supply air, a channel 7 through which air is suctioned from the working space 6 by the blower 11 and a discharge channel 14 located on the downstream side of the blower 11 through which air is discharged outside via a high-performance filter 19 for exhaust air. The clean bench is also equipped with the control device 24 to control operation of the blower 11 and the cleanness sensor 30 to measure air cleanness in the working space 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a clean bench that prevents dangerous chemicals, microorganisms, bacteria, or the like from leaking outside a work space.

  Conventionally, a clean bench, a biosafety cabinet, and the like in which a working space is formed in a housing for handling dangerous samples such as drugs or microorganisms and bacteria are known (see Patent Document 1). Such a clean bench is cleaned by passing most of the air in contact with a dangerous sample through a high-performance filter for air supply and blows it out to the work space, and part of the air passes through a high-performance filter for exhaust. Was discharged outside the cabinet. Then, the pressure in the working space is always lower than the outside and the outside air is guided into the working space, so that the air that has come into contact with the sample in the working space goes outside without passing through the high-performance exhaust filter. It was configured not to be discharged.

JP 2002-321174 A

  However, if the seal between the high-performance filter for cleaning the air in the work space and the main body that forms the work space is incomplete, or if the high-performance filter has a hole in the work space, etc. The cleanliness of can not be secured within the specified value. In addition, if the high-performance filter and the main body are imperfectly sealed or if there is something in the work space that prevents dust or laminar flow even if the high-performance filter has no holes, the cleanliness of the work space will be reduced. It cannot be secured. Since this cleanliness was invisible, it was not possible to notice a decrease in cleanliness after contamination had occurred. For this reason, there is a problem that it is not known whether the cause of the decrease in the cleanliness in the work space is due to the device of the clean bench or the operation.

  In addition, for a few minutes after the start of the operation of the clean bench, the air in the work space is not sufficiently replaced, and the prescribed cleanliness may not be reached during that time. For this reason, there has been a problem that it is not known how long after the start of the operation of the clean bench it will reach the prescribed cleanliness in the work space.

  In addition, since it is necessary to secure a sufficient air volume in order to clean the air in the work space of the clean bench, the air speed in the work space is set to be usually higher. For this reason, in the case of handling powdered pharmaceuticals or the like in the work space, there is a problem that the powder is scattered by the wind and the workability is deteriorated.

  The present invention has been made to solve the problems of the related art. When the cleanliness in the work space detected by the cleanliness sensor falls below a specified value, an alarm operation is executed by the control device. It is an object of the present invention to provide a clean bench capable of promptly reporting abnormalities.

  That is, the clean bench according to the present invention includes a work space having a finger insertion opening on the front surface, a blower for supplying clean air to the work space through a high-performance filter for supplying air, and an outflow from the work space. A communication passage that sucks the air that has been discharged by the blower and a discharge passage that is arranged on the leeward side of the blower and exhausts the air to the outside through a high-performance filter for exhaust, and controls the operation of the blower And a cleanliness sensor for measuring the cleanliness of the air in the work space.

  In the clean bench of the invention of claim 2, in the above, the control device performs a predetermined alarm operation when the cleanliness in the work space detected by the cleanliness sensor falls below a specified value. Features.

  The clean bench according to a third aspect of the present invention is characterized in that, in each of the above inventions, the control device controls the rotational speed of the blower based on the cleanliness in the work space detected by the cleanliness sensor.

  The clean bench according to claim 4 is the clean bench according to claim 3, wherein the control device controls the rotational speed of the blower so that the cleanliness in the work space detected by the cleanliness sensor becomes a predetermined value. It is characterized by.

  In addition to the above inventions, the clean bench of the invention of claim 5 is provided with a display device, and the control device displays the cleanliness in the work space detected by the cleanliness sensor on the display device, and / or Or the data regarding the said cleanliness is output outside.

  In addition to the fifth aspect, the clean bench according to the sixth aspect includes a temperature sensor for detecting the temperature in the work space, and the control device displays the temperature in the work space detected by the temperature sensor on the display device. And / or outputting data relating to the temperature to the outside.

  Further, in addition to the clean bench according to the invention of claim 7, in addition to the above-described inventions, the measurement flow path switching for selectively sucking air from a plurality of suction portions provided in a work space and supplying it to the cleanliness sensor And a control device that measures the cleanliness of a plurality of locations in the work space by a cleanliness sensor by switching the flow path of the measurement flow path switching device.

  The clean bench of the invention of claim 8 is the clean bench according to claim 7, wherein the control device calculates an average value of cleanliness at a plurality of locations in the work space, and when this average value falls below a specified value, A predetermined alarm operation is executed.

  The clean bench according to claim 9 is the clean channel according to claim 7 or claim 8, wherein the measurement flow path switching device discharges the air that has passed through the cleanliness sensor to a position downstream of the suction unit. It is characterized by.

  In addition to the above inventions, the clean bench of the invention of claim 10 alternatively sucks air from a suction part provided in the work space and a position after passing through a high-performance exhaust filter, and a cleanliness sensor The control device switches the flow channel of the measurement flow channel switching device to supply air to the work space and cleans the air that has passed through the high-performance filter for exhaust by the cleanliness sensor. It is characterized by measuring the degree.

  The clean bench according to an eleventh aspect of the present invention is the clean bench according to the tenth aspect, wherein the control device performs a predetermined alarm operation when the cleanliness in the work space detected by the cleanliness sensor falls below a specified value. At the same time, when the cleanliness of the air that has passed through the high-performance filter for exhaust gas detected by the cleanliness sensor falls below the specified value, a predetermined alarm operation that is distinct from the alarm regarding the cleanliness in the work space is executed. It is characterized by.

  In addition to the above inventions, the clean bench of the invention of claim 12 has a suction part for sucking air in the work space and supplying it to the cleanliness sensor, and this suction part is for extension. An air suction pipe can be connected.

  The clean bench according to a thirteenth aspect of the present invention is characterized in that, in each of the above inventions, the air near the opening for inserting a finger is not supplied to the cleanliness sensor.

  As described above in detail, according to the present invention, a work space having a finger insertion opening on the front surface, a blower for supplying clean air to the work space via a high-performance filter for supplying air, and a work space In a clean bench equipped with a communication passage that sucks air that has flowed out from the blower, and a discharge passage that is arranged on the leeward side of the blower and discharges air to the outside through a high-performance filter for exhaust, the operation of the blower is performed. Because it has a control device to control and a cleanliness sensor that measures the cleanliness of the air in the work space, for example, when the cleanliness in the work space decreases due to damage to the high-performance filter for air supply, etc. In addition to being able to detect the cleanliness in the work space by the cleanliness sensor, the control device can quickly notify the abnormality by executing a predetermined alarm operation as in claim 2.

  Further, according to the invention of claim 3, in each of the above inventions, the control device controls the rotational speed of the blower based on the cleanliness in the work space detected by the cleanness sensor, for example, in the work space. Even if powdered pharmaceuticals are handled, while maintaining the inside of the working space at a prescribed cleanliness, the rotational speed of the blower can be minimized to reduce the wind speed and reduce powder scattering. Further, for example, as the high-performance filter for supplying air gradually becomes clogged as dust or samples in the air are removed, the control device is a blower as in claim 4, for example. It is possible to control the number of rotations and control the cleanliness in the work space to a specified value.

  According to the invention of claim 5, in addition to the above inventions, a display device is provided, the control device displays the cleanliness in the work space detected by the cleanliness sensor on the display device, and / or If the data regarding the cleanliness is output to the outside, it is possible to directly recognize whether the control by the control device is functioning normally or whether the work can be performed safely.

  According to the invention of claim 6, the temperature sensor for detecting the temperature in the work space is provided, the control device displays the temperature in the work space detected by the temperature sensor on the display device, and / or By outputting the data relating to the temperature to the outside, it is possible to directly recognize the temperature environment in the work space, and it becomes easy to create a record of the work environment.

  According to a seventh aspect of the invention, in addition to the above-mentioned inventions, the measurement flow path switching for alternately sucking air from the suction portions provided at a plurality of locations in the work space and supplying the air to the cleanliness sensor. Since the control device measures the cleanliness of multiple locations in the work space by the cleanliness sensor by switching the flow path of the measurement flow path switching device, the control device can operate with a single cleanliness sensor. It becomes possible to measure the cleanliness at a plurality of locations in the space. Thereby, it becomes possible to recognize the cleanliness in the entire work space. Therefore, it becomes possible to quickly cope with the danger that the work space will be contaminated with dangerous samples such as drugs or microorganisms and bacteria.

  According to the invention of claim 8, the control device calculates an average value of cleanliness at a plurality of locations in the work space, and executes a predetermined alarm operation when the average value falls below a specified value. Therefore, it is possible to quickly cope with abnormalities in the entire work space.

  In addition, according to the ninth aspect of the invention, the measurement flow path switching device discharges the air that has passed through the cleanliness sensor to a position downstream of the air from the suction portion. The inconvenience of returning to the cleanliness sensor can be prevented. As a result, only the air in the work space can be measured by the cleanliness sensor. Therefore, it becomes possible to reliably grasp the cleanliness of the air in the current working space.

  According to the invention of claim 10, in addition to the above-mentioned inventions, air is selectively sucked from the suction portion provided in the work space and through the high-performance filter for exhaust, and the cleanliness sensor is used. The control device is provided with a measurement flow path switching device to be supplied, and the control device switches the flow path of the measurement flow channel switching device, so that the cleanliness of the air that has passed through the high-performance filter for exhaustion in the work space by the cleanliness sensor. In addition to cleanliness in the work space, a single cleanliness sensor can recognize external contamination due to breakage of a high performance exhaust filter without using multiple cleanliness sensors. be able to. As a result, it is possible to secure external safety and suppress the cost increase of the clean bench.

  According to the eleventh aspect of the present invention, when the cleanliness in the work space detected by the cleanliness sensor falls below a specified value, the control device performs a predetermined alarm operation and uses the cleanliness sensor. When the detected cleanness of the air that has passed through the high-performance filter for exhaust gas falls below the specified value, a predetermined alarm operation that is distinct from the alarm related to the cleanliness in the work space is executed. It is possible to distinguish between the abnormality of the high-performance filter and the abnormality of the high-performance filter for supplying air. As a result, the abnormality of the high-performance filter for exhaust and the abnormality of the high-performance filter for air supply can be reliably distinguished, and the repair and maintenance of the clean bench can be easily performed.

  According to the twelfth aspect of the present invention, the suction portion for sucking the air in the work space and supplying it to the cleanliness sensor is provided, and an extension air suction pipe can be connected to the suction portion. Therefore, if the end of the air suction pipe connected to the suction part is moved to an arbitrary place in the work space, the cleanliness of the predetermined place in the work space can be easily recognized. As a result, the damaged portion of the high-performance filter for supplying air can be searched for, and the repair and maintenance of the clean bench can be easily performed.

  According to the invention of claim 13, since the air near the opening for inserting the finger is not supplied to the cleanliness sensor, the dust in the air sucked from the opening for inserting the finger through the communication path is removed. It is possible to prevent measurement with a direct cleanliness sensor. Thereby, the cleanliness only in the work space can be measured, and the cleanliness in the work space can be measured very accurately.

  The main feature of the present invention is that the cleanliness of the air in the work space is measured by a cleanness sensor in order to prevent the cleanliness in the work space from being lowered below a specified value. The purpose of notifying that the air cleanliness has fallen below a specified value has been realized by providing air suction portions for suctioning the cleanliness sensors at a plurality of locations in the work space.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a conceptual side view of a clean bench 1 of the present invention, and FIG. 2 is a block diagram of a control circuit of the clean bench 1 of the present invention. As shown in FIG. 1, the clean bench 1 includes a work table 3 provided above a lower wall 5A at a lower position inside a main body 5 made of a casing, and a predetermined distance from a rear wall 5B at the rear. A work space 6 is formed by the partition plate 2 provided in front and the high-performance filter 9 for air supply provided in the upper part, and an openable / closable door 8 that is movable up and down in the front opening 4 of the work space 6. It has.

  A series of communication paths 7 are formed from the lower side of the work space 6 to the rear and from the lower rear side to the upper side. The communication path 7 includes a lower wall 5A, a work table 3, a rear wall 5B, a rear partition plate 2, And an upper wall 5C provided at the upper part of the main body 5 and a high-performance filter 9 for supplying air provided at a predetermined interval below. The high-performance filter 9 for supplying air is composed of a HEPA filter that can obtain a cleanliness of approximately 100% by removing chemicals contained in the passing air or dangerous samples such as microorganisms and bacteria. 6 is attached in such a manner as to close an opening (not shown) that opens the top surface.

  The upper wall 5C provided on the upper part of the main body 5 removes chemicals contained in the air or dangerous samples such as microorganisms and bacteria as well as the high-performance filter 9 for air supply by closing an opening (not shown). Thus, a high-performance filter 19 for exhaust composed of a HEPA filter capable of obtaining a cleanliness of approximately 100% is attached. A duct 20 is connected to the high-performance filter 19 for exhaust, and a discharge path 14 is formed in the duct 20.

  Further, a display device 28 composed of a liquid crystal or a 7-segment LED is provided above the opening 4 on the front surface of the main body 5 and an alarm device 40 composed of a red lamp, an orange lamp, a buzzer, or the like. Is provided. The display device 28 is configured to display the cleanliness in the work space 6 detected by the cleanliness sensor 30 or the cleanness in the discharge path 14, and the alarm device 40 is configured to display the cleanliness in the work space 6. When the value is equal to or less than a preset specified value, or when the cleanliness of the air that has passed through the high-performance exhaust filter 19 and is purified is equal to or less than a preset specified value, a predetermined alarm operation is performed (in this case The buzzer is sounded, or the lamp blinks or lights up.

  On the other hand, an air blower 11 made of a sirocco fan is disposed above the communication path 7 between the rear wall 5B and the partition plate 2 so as to partition the communication path 7. Further, exhaust holes 12 and 13 are formed on both front and rear ends of the work table 3, and the exhaust holes 12 and 13 communicate with the lower portion of the work space 6 and the communication path 7. The blower 11 pumps air sucked from the communication passage 7, and the leeward side of the blower 11 communicates with the work space 6 through the high-performance filter 9 for supplying air and the exhaust air. The high-performance filter 19 and the exhaust passage 14 in the duct 20 communicate with the outside.

  An open plate 21 is provided in the duct 20. When the blower 11 is operated and the air in the communication path 7 is sucked in, the opening / closing plate 21 maintains the cleanliness in the work space 6 within a specified value and discharges the communication path 7 to a predetermined low pressure. 14 is used to adjust the air volume of the air passing through the inside. In addition, an opening 4A is formed in the lower part of the open / close door 8 in a state where the open / close door 8 is pushed upward, and a finger can be inserted into the work space 6 from the opening 4A.

  When the blower 11 of the clean bench 1 configured as described above is operated, most of the air pumped from the blower 11 is cleaned in the process of passing through the high-performance filter 9 for supplying air, and then the arrow in the figure. As shown in FIG. 4, the air is blown into the work space 6 from above. A part of the air blown into the working space 6 from above is sucked into the communication path 7 from the exhaust port 12 together with the outside air that flows downstream substantially straight and flows in from the opening 4A. The remaining air blown into the work space 6 from above is sucked into the communication path 7 through the exhaust hole 13. Further, a part of the air pressure-fed from the blower 11 does not pass through the high-performance filter 9 for supplying air but passes through the high-performance filter 19 for exhausting. At that time, it is cleaned and discharged from the duct 20 to the outside. .

  In this case, the air in the work space 6 is sucked by the blower 11 from the exhaust holes 12 and 13, and the pressure in the work space 6 becomes lower than the outside by the amount of air discharged from the discharge passage 14. . Therefore, the same amount of outside air as the amount of air discharged from the discharge passage 14 is sucked from the opening 4A and flows into the work space 6, but the work space 6 opening 4A is substantially straight from the high-performance filter 9 for supplying air. Most of the downstream air does not flow into the interior of the work space 6 but flows out from the exhaust hole 12 into the communication path 7. As a result, it is possible to prevent the outside air from entering the work space 6 and maintain the cleanliness in the work space 6 within a specified value. The air in the work space 6 is always cleaned by the high-performance filter 19 and then discharged to the outside. Therefore, it is possible to work safely in the work space 6 and to secure external safety.

  The clean bench 1 includes a control device 24 (illustrated in FIG. 2) for controlling the operation of the blower 11 and the measurement flow path switching device 18, and a clean device for measuring the cleanliness of the air in the work space 6. A degree sensor 30 is provided. The cleanliness sensor 30 measures, for example, the number of chemicals or particles such as microorganisms and bacteria per unit volume contained in the air passing through the cleanliness sensor 30 in units of microns or less. The pipe 34 connected to the inlet side of the cleanliness sensor 30 is provided with the suction part 16 at the end via the measurement flow path switching device 18.

  The measurement flow path switching device 18 includes a plurality of solenoid valves (first solenoid valve 18A, second solenoid valve 18B, third solenoid valve 18C, and fourth solenoid valve 18D). A plurality of suction sections (first suction section 16A, second suction section 16B, third suction section 16C, fourth suction section 16D) are configured. The pipe 34 includes a plurality of pipes (a first pipe 34A, a second pipe 34B, a third pipe 34C, and a fourth pipe 34D), and the first suction part 16A, The second suction part 16B is provided at the end of the second pipe 34B, the third suction part 16C is provided at the end of the third pipe 34C, and the fourth suction part 16D is provided at the end of the fourth pipe 34D.

  The first suction part 16A is a communication path 7 between the lower wall 5A provided at the lower part of the main body 5 and the work table 3, the second suction part 16B is near the lower part in the work space 6, and the third suction part 16C is The substantially vertical center in the work space 6 and the fourth suction part 16D are respectively opened in the discharge passage 14 in the duct 20 communicating with the outside. Further, the discharge pipe 37 connected to the outlet side of the cleanliness sensor 30 opens to the upper part of the communication path 7 between the rear wall 5B and the rear partition plate 2 (near the lower side of the blower 11) via the air pump 38. . The air pump 38 sucks air from the suction portions 16 of the plurality of pipes 34, and discharges the air that has passed through the cleanliness sensor 30 downstream of the suction portion 16 (near the lower side of the blower 11). In this case, it is possible to prevent the air that has passed through the cleanliness sensor 30 from returning directly to the cleanliness sensor 30, so that the cleanliness of the air in the current working space 6 can be reliably grasped. .

  A temperature sensor 32 for detecting the temperature in the work space 6 is provided in the work space 6, and the work space 6 is configured to be connectable to the second suction part 16B or the third suction part 16C. An air suction pipe 39 for sucking the air in 6 and supplying it to the cleanliness sensor 30 is provided. The air suction pipe 39 is composed of a rubber hose or a flexible and bendable hose such as a synthetic resin, with one end connected to the second suction part 16B or the third suction part 16C. The other end is configured to have a length that reaches every corner of the work space 6. When the air suction pipe 39 is not used, the air suction pipe 39 is suspended by a hanging tool 39A provided so as to protrude into the work space 6.

  On the other hand, the clean bench 1 is provided with a control device 24 as shown in FIG. The control device 24 is connected to the blower 11, the display device 28, and the alarm device 40, and also includes a cleanliness sensor 30 and a plurality of electromagnetic valves (first electromagnetic valve 18A, second electromagnetic valve 18B, third electromagnetic valve). A valve 18C and a fourth electromagnetic valve 18D) are connected to each other. When these solenoid valves 18A, 18B, 18C, 18D are opened, air flows into the pipe 34 (pipes 34A, 34B, 34C, 34D), and when they are closed, the flowing air is stopped.

  The control device 24 normally opens the electromagnetic valves 18A, 18B, 18C, and 18D in order, and sucks air from the suction portions 16A, 16B, 16C, and 16D in order, for example, at intervals of 15 to 30 seconds. The cleanliness of the portions where the suction portions 16A, 16B, 16C, and 16D are opened is measured. In this way, the preset cleanliness of the location where the suction parts 16A, 16B, 16C, 16D are opened is measured. In addition, the control device 24 can selectively air from the suction portions 16A, 16B, 16C, and 16D by opening / closing control of the first solenoid valve 18A, the second solenoid valve 18B, the third solenoid valve 18C, and the fourth solenoid valve 18D. Is supplied to the cleanliness sensor 30.

  That is, the control device 24 closes the first electromagnetic valve 18A and the fourth electromagnetic valve 18D (in this case, the air in the vicinity of the finger insertion opening 4A and the air in the discharge path 14 cannot be sucked), The average value of the cleanliness of the air measured by the cleanliness sensor 30 by sucking time separately from the two suction sections 16B and the third suction section 16C is calculated. Then, when the calculated cleanliness of the average value of the air is equal to or less than a preset specified value, the alarm device 40 performs a predetermined alarm operation. In this case, the control device 24 calculates the cleanliness by measuring the air simultaneously sucked from the second and third suction parts 16B and 16C with the cleanliness sensor 30, and the calculated cleanliness of the air is a predetermined value set in advance. In the following cases, that is, when the number of particles per unit volume in the air input to the cleanliness sensor 30 increases, the alarm device 40 performs a predetermined alarm operation. Thereby, it is possible to promptly notify the abnormality in the work space 6 and to quickly deal with the abnormality in the entire area of the work space 6.

  Further, the time is separately sucked from the second suction unit 16B and the third suction unit 16C and measured by the cleanliness sensor 30, and the cleanliness of either one of the air is below a preset specified value. In this case, that is, when the number of particles per unit volume in the air input to the cleanliness sensor 30 increases, the alarm device 40 performs a predetermined alarm operation. In this case, since it is possible to determine whether the air is sucked from the second suction part 16B or the third suction part 16C, where the cleanliness of the air in the work space 6 is equal to or less than a preset specified value Can be recognized. Thereby, the abnormality in the work space 6 can be dealt with quickly.

  Further, the control device 24 closes the first electromagnetic valve 18A, the second electromagnetic valve 18B, and the third electromagnetic valve 18C, and measures the cleanliness of the air only from the fourth suction portion 16D to the discharge passage 14. Then, when the measured cleanness of the air in the discharge passage 14 is equal to or less than a predetermined value set in advance, a predetermined alarm operation that is different from the alarm regarding the cleanliness in the work space 6 is executed and the alarm device 40 is operated. Let In this case, if an alarm such as blinking or lighting of a lamp is performed when the cleanliness in the work space 6 is abnormal, an alarm such as a buzzer is sounded when the cleanliness in the work space 6 is abnormal. Further, if an alarm is issued such as sounding a buzzer when the cleanliness in the work space 6 is abnormal, an alarm such as blinking or lighting of a lamp is performed when the cleanliness in the work space 6 is abnormal. As a result, it is possible to distinguish whether the alarm from the alarm device 40 is an abnormality of the exhaust high-performance filter 19 or the air supply high-performance filter 9, so that the maintenance of the clean bench 1 can be easily performed. Will be able to.

  Further, based on the cleanliness in the work space 6 detected by the cleanliness sensor 30, the control device 24 reduces the rotational speed of the blower 11 and increases the wind speed when the cleanness in the work space 6 is equal to or greater than a specified value. Weaken. Accordingly, even when powder pharmaceuticals or the like are handled in the work space 6, the speed of the blower 11 can be adjusted to the minimum and the wind speed can be reduced while maintaining the work space 6 at a specified cleanliness. Therefore, powder scattering can be reduced. Further, the control device 24 is gradually clogged as the high performance air filter 9 for supplying air removes dust, samples, etc. in the air, and the cleanliness in the work space 6 becomes below a specified value. In this case, the rotational speed of the blower 11 is controlled in accordance with the cleanliness to increase the wind speed, so that the cleanliness in the work space 6 can be quickly controlled within a specified value.

  Further, the control device 24 closes the second electromagnetic valve 18B, the third electromagnetic valve 18C, and the fourth electromagnetic valve 18D, and measures the cleanliness of the air in the communication path 7 from the first suction portion 16A. When the measured cleanness of the air in the communication path 7 is equal to or less than a preset specified value, another alarm operation (intermittently sounds a buzzer) distinguished from the alarm regarding the cleanliness in the work space 6. Alternatively, the alarm device 40 is operated by changing the lamp color, changing the lamp blinking state, or the like. In this case, the cleanliness sensor 30 measures the cleanliness of the air that has flowed into the communication path 7 from the opening 4A, so that when the cleanliness in the communication path 7 is abnormally high, outside air is exhausted from the opening 4A to the exhaust hole. The danger of entering the work space 6 without entering 12 can be prevented.

  Further, the control device 24 displays the cleanliness in the work space 6 detected by the cleanliness sensor 30 on the display device 28 and / or outputs data relating to the cleanliness to the outside (display device 28). Therefore, it is possible to directly recognize whether the control by the control device 24 is functioning normally or whether the work can be performed safely.

  Further, the control device 24 displays the temperature in the work space 6 detected by the temperature sensor 32 on the display device 28, and data related to the temperature in the work space 6 detected by the temperature sensor 32 is displayed on the external display device 28. Output. Thereby, the temperature environment in the work space 6 can be directly recognized from the outside.

  As described above, the clean bench 1 includes the control device 24 that controls the operation of the blower 11 and the cleanliness sensor 30 that measures the cleanliness of the air in the work space 6. When the seal between the high-performance filter 9 for air supply for cleaning and the main body 5 forming the work space 6 is incomplete, or when the hole is opened in the high-performance filter 9 for air supply, or When there is a thing that obstructs the load or laminar flow in the work space 6 and the cleanliness in the work space 6 cannot be secured below the specified value, the control device 24 cleans the work space 6 detected by the cleanness sensor 30. It is detected that the degree has dropped below the specified value, and a predetermined alarm action is executed to promptly notify the abnormality. Thereby, since it can be judged reliably whether the cause of the reduction | decrease in the cleanliness in the work space 6 is a thing by the apparatus of the clean bench 1, or an operation thing, repair and a maintenance can be performed easily. .

  Further, even after the operation of the clean bench 1 is started, it is possible to grasp that the inside of the work space 6 has reached the specified cleanliness by merely visually recognizing the cleanliness output to the outside by the display device 28. Thereby, since it can work after confirming that the cleanliness in the work space 6 has reached the specified value, it takes a long time until the cleanliness in the work space 6 reaches the specified value after the operation of the clean bench 1 is started. Even in such a case, it is possible to prevent inconvenience such as starting the work before the cleanliness in the work space 6 becomes equal to or less than the specified value.

  Further, the clean bench 1 is used for the measurement in which air is selectively sucked from suction portions 16 (suction portions 16A, 16B, 16C, 16D) provided at a plurality of locations in the work space 6 and supplied to the cleanliness sensor 30. Since the flow path switching device 18 (electromagnetic valves 18A, 18B, 18C, and 18D) is provided, the control device 24 controls the electromagnetic valves 18A, 18B, 18C, and 18D to control the pipes 34 (pipes 34B and 34C). By switching the flow paths, the cleanliness of the plurality of places in the work space 6 can be measured by the cleanliness sensor 30. Thereby, the single cleanliness sensor 30 can measure the cleanliness at a plurality of locations in the work space 6, and can partially recognize the cleanliness throughout the workspace 6.

  Further, the clean bench 1 is used for the measurement in which air is selectively sucked from suction portions 16 (suction portions 16A, 16B, 16C, 16D) provided at a plurality of locations in the work space 6 and supplied to the cleanliness sensor 30. Since the flow path switching device 18 (electromagnetic valves 18A, 18B, 18C, 18D) is provided, the control device 24 controls the electromagnetic valves 18A, 18B, 18C, 18D to control the pipes 34 (pipes 34A, 34B, 34C) is stopped, air is circulated in the fourth pipe 34D, or air is circulated in the pipe 34 (pipes 34B, 34C), and the air flow in the fourth pipes 34A, 34D is stopped. By switching so that the cleanness sensor 30 can measure the cleanliness of the air that has passed through the work space 6 and the high-performance filter 19 for exhaust, a plurality of cleanliness can be obtained. Other cleanliness of the work space 6 in a single cleanliness sensor 30 without using the sensors 30, can be recognized external contamination due to damage of the high-performance filter 19 for exhaust. Thereby, it becomes possible to suppress the cost increase of the clean bench 1.

  In addition, since the extension air suction pipe 39 can be connected to the suction part 16 (second suction part 16B or third suction part 16C) provided in the work space 6, the air suction connected to the suction part 16 If the end of the pipe 39 is moved to an arbitrary location in the work space 6, the cleanliness of the predetermined location in the work space 6 can be easily measured. As a result, the damaged portion of the high-performance filter 9 for supplying air can be searched for, and the repair and maintenance of the clean bench 1 can be easily performed.

  Further, if the control device 24 closes the first electromagnetic valve 18A, the air near the opening 4A for inserting the finger is not supplied to the cleanliness sensor 30. Therefore, dust in the air entering from the outside via the communication path 7 is directly applied. Measurement with the cleanliness sensor 30 can be prevented. Thereby, the cleanliness only in the work space 6 can be measured, and the cleanliness in the work space 6 can be measured very accurately.

  In the embodiment, the first suction part 16A is provided in the lower part of the main body 5 and the communication path 7 between the lower wall 5A and the work table 3, and the second suction part 16B is near the lower part in the work space 6, and the third suction. The portion 16C is opened at the approximate center in the vertical direction in the work space 6, and the fourth suction portion 16D is opened in the discharge passage 14 in the duct 20 communicating with the outside. The opening locations of the suction portions 16 are as described above. Not limited to this, it may be anywhere in the work space 6. In addition, although four suction portions 16 (suction portions 16A, 16B, 16C, 16D) are provided, the number of suction portions is not limited to this, and even if a larger number of suction portions are provided to measure the cleanliness in the work space 6 in detail. good. In this case, it is possible to grasp in detail which part of the work space 6 has a cleanliness equal to or lower than a predetermined position, and a more stable cleanliness can be realized.

  Further, the display device 28 and the alarm device 40 are provided in the upper part of the opening 4 on the front surface of the main body 5, but the attachment position of the display device 28 and the alarm device 40 is not limited to the upper part of the opening 4 on the front surface of the main body 5. In particular, it may be provided on the surface of the rear partition plate 2. In this case, since the display device 28 and the alarm device 40 can be visually recognized even while working in the work space 6, the cleanliness in the work space 6 becomes equal to or less than a specified value, and the alarm device 40 executes an alarm operation. Previously, it was convenient to handle samples that deteriorated cleanliness.

It is a side conceptual diagram of the clean bench of the present invention. It is a block diagram of the control circuit of the clean bench of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clean bench 2 Back surface partition plate 3 Worktable 4A Opening part 5 Main body 6 Work space 7 Communication path 8 Opening / closing door 9 High performance filter 11 Blower 12 Exhaust hole 13 Exhaust hole 14 Exhaust path 16 Suction part 18 Measurement flow path switching device 19 High performance filter 20 Duct 24 Control device 28 Display device 30 Cleanliness sensor 32 Temperature sensor 34 Pipe 37 Discharge pipe 38 Air pump 39 Air suction pipe 40 Alarm device

Claims (13)

A work space having a finger insertion opening on the front surface, a blower for supplying clean air to the work space via a high-performance filter for supplying air, and air blown out of the work space is sucked by the blower In a clean bench provided with a communication path and a discharge path that is disposed on the leeward side of the blower and discharges air to the outside through a high-performance filter for exhaust,
A clean bench comprising a control device for controlling the operation of the blower and a cleanliness sensor for measuring the cleanliness of the air in the work space.   2. The clean bench according to claim 1, wherein when the cleanliness in the work space detected by the cleanliness sensor is reduced to a predetermined value or less, the control device performs a predetermined alarm operation.   The clean bench according to claim 1 or 2, wherein the control device controls the rotational speed of the blower based on the cleanliness in the work space detected by the cleanliness sensor.   The clean bench according to claim 3, wherein the control device controls the rotational speed of the blower so that the cleanliness in the work space detected by the cleanliness sensor becomes a predetermined value.   A display device, wherein the control device displays the cleanliness in the work space detected by the cleanliness sensor on the display device and / or outputs data relating to the cleanliness to the outside. The clean bench according to claim 1, claim 2, claim 3 or claim 4.   A temperature sensor for detecting a temperature in the work space; and the control device displays the temperature in the work space detected by the temperature sensor on the display device and / or externally transmits data relating to the temperature. The clean bench according to claim 5, wherein   A measuring flow path switching device that alternatively sucks air from suction portions provided at a plurality of locations in the work space and supplies the air to the cleanliness sensor, and the control device includes the measuring flow path switching device. The cleanliness of the plurality of locations in the work space is measured by the cleanliness sensor by switching the flow path of the first, second, third, fourth, and fifth. Or the clean bench of Claim 6.   The said control apparatus calculates the average value of the cleanliness of several places in the said work space, and when this average value falls below a regulation value, it performs predetermined alarm operation | movement. Clean bench.   The clean bench according to claim 7 or 8, wherein the measurement flow path switching device discharges the air that has passed through the cleanliness sensor to a position downstream of the suction unit.   A flow path switching device for measurement, which selectively sucks air from a suction portion provided in the work space and through the high-performance filter for exhaust, and supplies the air to the cleanliness sensor; The cleanliness of the air that has passed through the work space and the high-performance filter for exhaust is measured by the cleanliness sensor by switching the flow path of the measurement flow path switching device. The clean bench of claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, claim 8, or claim 9.   When the cleanliness in the work space detected by the cleanliness sensor is reduced to a predetermined value or less, the control device performs a predetermined alarm operation, and for the exhaust gas detected by the cleanliness sensor. 11. The clean bench according to claim 10, wherein when the cleanliness of the air that has passed through the high-performance filter falls below a predetermined value, a predetermined alarm operation that is different from an alarm regarding the cleanliness in the work space is executed.   2. An air suction pipe for sucking air in the working space and supplying it to the cleanliness sensor, and an extension air suction pipe can be connected to the suction part. The clean bench according to claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, claim 8, claim 9, or claim 11.   The air in the vicinity of the finger insertion opening is not supplied to the cleanliness sensor. Claims 1, 2, 3, 4, 5, 6, and 6 The clean bench according to claim 7, claim 8, claim 9, claim 10, claim 11 or claim 12.

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