JP4162433B2 - Filter entry / exit device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a filter loading / unloading device for loading / unloading a filter with respect to a gas passage.
[0002]
[Prior art]
  For example, as a device that measures formaldehyde concentration in the indoor environment, it includes indoor air or formaldehyde from which formaldehyde has been removed by desorbing a filter that adsorbs formaldehyde, etc., to a gas passage that supplies indoor air to the sensor. Based on the detection result when supplying indoor air as it is to the sensor and supplying indoor air from which formaldehyde has been removed, and the detection result when supplying indoor air containing formaldehyde, etc. Some are configured to perform concentration measurements.
  As described above, as a means for detaching the filter from the gas passage, an operator conventionally attaches or removes the filter by hand.
[0003]
[Problems to be solved by the invention]
  Conventionally, in order to attach and detach the filter to and from the gas passage, it has been necessary to manually rotate and tighten or loosen the filter mounting screw, which is troublesome.
[0004]
  An object of the present invention is to provide a filter loading and unloading device that can quickly perform the above-described filter desorption while making it difficult to cause a gas path seal failure.
[0005]
[Means for Solving the Problems]
  The configuration, operation, and effect of the invention according to claim 1 are as follows.
[0006]
〔Constitution〕
  In the filter insertion / removal device according to the first aspect of the present invention, the operation mechanism for moving the filter holder so that the filter enters and exits the gas passage, and the gas passage when the filter enters the gas passage. The seal part between the passage forming member that forms the filter and the filter holder is pressed against the contact target part, and when the filter holder moves, the seal part releases the press contact with the contact target part. To be in a released seal stateCut intoSeal switching means for switching operationThe seal switching means includes a rotary protrusion provided on one of the passage forming member and the filter holder and provided with a roller rotatably attached thereto, a recess provided on the other side, and an extrusion. And a biasing means for biasing the seal portion against the contact target portion by biasing the protrusion so as to enter the recess, and the filter mechanism is moved by the operation mechanism. Accordingly, the seal portion is switched to the sealed state when the protrusion enters the recess, and the seal portion is switched to the seal release state when the protrusion contacts the pushing surface.
[0007]
  [Action]
  When the operation mechanism is activated, the operation mechanism moves the filter holder to move the filter in and out of the gas passage. When the operation mechanism performs the moving operation of the filter, if the seal portion remains in a sealed state pressed against the contact target portion, it is strong against the seal portion due to relative movement between the seal portion and the contact target portion. Although friction occurs, the seal switching means automatically switches the seal portion to the seal release state in accordance with the movement operation of the operation mechanism, and the pressure contact with the contact target portion of the seal portion is released, and friction is generated in the seal portion. Disappear. When the operating mechanism enters the gas passage to operate the filter and the filter is in the active state, the seal switching means automatically switches the seal part to the sealed state as the filter is switched to the active state, and the seal part is subject to contact. The gas passage is in a sealed state by being in pressure contact with the portion.
[0008]
In configuring the seal switching means to switch the seal portion between the seal state and the seal release state in accordance with the movement operation of the filter by the operation mechanism, the seal portion is switched to the active state or the seal portion is moved. It can also be configured by adopting a sensor for detecting the presence of the sensor and a control means for switching the seal portion between a seal state and a seal release state based on information from the sensor. On the other hand, in the invention according to the present invention, when the seal portion enters the gas passage, the projection and the recess are matched, and the projection enters the recess due to the biasing means. Will be sealed. When the seal part is moved, the rotary projection provided with the roller rotatably removes from the recessed part and rides on the extrusion surface, which causes the seal part to be in the seal release state. It is possible to configure the seal switching means while eliminating the need for sensors and control means.
[0009]

〔effect〕
Therefore, when performing gas supply, the gas passage of the filter can be switched, for example, by switching the supply gas, while the seal portion is in a sealed state and the gas passage is sealed, and leakage can be avoided due to poor sealing. In order to desorb and attach to, it can be performed quickly only by operating the operation mechanism. In addition, the filter is moved while avoiding the friction of the seal portion, and the seal portion is not easily damaged or worn, and can be used for a long time.
[0010]
In addition, a rotating projection or recess provided with a roller rotatably attached, or an urging means is provided. By simply configuring the seal switching means with a simple structure and compactly, it is possible to obtain a simple and compact structure from the surface of the seal switching means that allows quick insertion and removal of the filter with respect to the gas passage while avoiding friction at the seal portion.
[0011]
The configuration of the invention according to claim 2 is as follows.
[0012]
〔Constitution〕
In the configuration of the invention according to claim 1, the seal switching means includes the protrusion provided on one of the passage forming member and the filter holder, and the recess and the extrusion surface provided on the other. In both sides of the filter holder.
[0013]
  The structure, operation, and effect of the invention according to claim 3 are as follows.
[0014]
〔Constitution〕
  In the configuration of the invention according to claim 1 or 2, the seal portion is a seal material produced as a separate part from the filter holder and mounted on the filter holder.
[0015]
  [Action]
  Since the seal part is manufactured as a separate part from the filter holder, the seal part is provided with properties suitable for sealing such as elasticity, and the filter holder is provided with properties suitable for filter moving operation such as strength. Can be made.
[0016]
〔effect〕
  Therefore, the filter passage is reliably moved without causing the filter holder to be deformed due to the operation force of the operation mechanism, while the gas passage is accurately sealed by the seal portion, and the leakage prevention is surely performed. Can be put in and out accurately.
[0017]
  The configuration, operation, and effect of the invention according to claim 4 are as follows.
[0018]
〔Constitution〕
  According to a third aspect of the present invention, the filter holder includes a seal material assembly groove for holding the seal material.
[0019]
  [Action]
  The filter holder supports the sealing material by being held by the sealing material assembly groove. As a result, even if the seal switching means is provided with the above-described recesses, protrusions, etc., even if the operation mechanism is operated and the seal material is rubbed with the contact target portion before switching to the seal release state, the seal material Is firmly supported by the filter holder, and it becomes difficult to move or come off.
[0020]
〔effect〕
  Even when the seal material is put in and out, even if it is switched to the seal release state while rubbing against the contact target part, it is difficult for the seal material to move or come off, and gas is supplied while accurately sealing the gas passage. it can.
[0021]
  The configuration, operation, and effect of the invention according to claim 5 are as follows.
[0022]
〔Constitution〕
  In the configuration of the invention according to claim 3 or 4, the sealing material is configured such that the filter is fixed to the assembly portion.
[0023]
  [Action]
  When the seal material is assembled to the filter holder, the seal material is in a state of securing the filter to the assembly portion, and the filter can be prevented from coming off at once.
[0024]
〔effect〕
  When assembling the sealing material and the filter to the filter holder, the assembling state can be easily obtained by assembling the sealing material and preventing the filter from coming off at once.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
  As shown in FIG. 1, an operation panel 1 is provided on the top plate, an intake port 2 is provided on one upper part of the left and right side plates, and an inside of the measurement case 4 is provided with an exhaust port 3 on the other side plate. The sensor 5 and a power supply unit for supplying power from the dry battery are provided to form a formaldehyde measuring device.
[0026]
  This measuring device measures the formaldehyde concentration in an indoor environment such as a house. More specifically, in addition to the sensor 5, one end side is connected to the gas contact portion 5a of the sensor 5 as shown in FIG. The gas passage 6 is connected to the inlet 6a of the gas passage 6, and the other end is made of a resin hose connected to the intake port 2 of the measurement case 4, and an electric micro air pump 7a is provided on the way. A gas supply path 7, one end side connected to the outlet 6 b of the gas passage 6, and the other end side connected to the exhaust port 3 of the measurement case 4. A filter loading / unloading device M including a filter holder 10 having one end side inserted between the inlet 6a and the outlet 6b and the gas contact part 5a of the sensor 5; The control unit CP of the microcomputer utilized that is linked to the output of the driving unit and the sensor 5 of the electric filter out motor 21 and the air pump 7a of the apparatus M are configured by providing the inside of the measuring casing 4.
[0027]
  That is, when the start switch 1a of the operation panel 1 shown in FIG. 1 is operated, the control device CP inputs a measurement command from the start switch 1a and executes measurement control for operating the air pump 7a and the filter take-out motor 21. As a result, initial setting is performed first, and the filter loading / unloading apparatus M moves the filter holder 10 to the reference value measuring side by the driving force of the filter loading / unloading motor 21 so that the filter as shown in FIG. 2 and FIG. One of the two types of filters 11 and 12 supported by the holder 10 is inserted into the gas passage 6. When the first filter 11 enters the gas passage 6 and the detection switch 23 that detects this based on the movement position of the holder transfer body 22 shown in FIG. 2 enters the detection state, the air pump 7a is driven. The gas supply path 7 sucks the sample air from the inlet 2 by the pumping action of the air pump 7 a and supplies it to the gas passage 6, and part of the sample air flowing into the gas passage 6 passes through the first filter 11. Then, the sample air that has flowed into the gas contact portion 5 a of the sensor 5 and overflowed flows into the gas discharge path 8 from the outlet 6 b of the gas passage 6 and is discharged to the outside from the exhaust port 3. When the primary sample supply is performed for 5 minutes, the filter loading / unloading motor 21 is driven, and the filter loading / unloading apparatus M moves the filter holder 10 to the formaldehyde measurement side by the driving force of the filter loading / unloading motor 21. As shown in FIG. 8C, the first filter 11 is taken out from the gas passage 6, and the second filter 12 is inserted into the gas passage 6. When the second filter 12 enters the gas passage 6 and enters the detection state of the detection switch 24 in FIG. 2, which detects this based on the movement position of the holder transfer body 22, the air pump 7a is driven again. Then, the gas supply path 7 again sucks the sample air from the intake port 2 and supplies it to the gas passage 6, and a part of the sample air flowing into the gas passage 6 passes through the second filter 12 and passes through the sensor 5. The sample air that has flowed into the gas contact portion 5a and overflowed is discharged from the exhaust port 3 to the outside through the outlet 6b of the gas passage 6 and the gas discharge passage 8. When 5 minutes have passed since the secondary sample supply, the driving of the air pump 7a is stopped, the supply of the sample air is stopped, and the detection result by the sensor 5 when the control device CP supplies the primary sample. Based on the detection result of the sensor 5 when the secondary sample is supplied, the formaldehyde concentration is measured.
[0028]
  That is, the first filter 11 includes a filter formed by coating 2,4-dinitrophenylhydrazine (hereinafter abbreviated as 2,4-DNPH) on glass wool as a main filter. By the action of 4-DNPH, aldehydes and ketones such as acetone are adsorbed, and volatile organic compounds (hereinafter abbreviated as VOC) such as xylene, toluene and alcohol other than ketones are allowed to pass through.
  The second filter 12 does not include a filter using 2,4-DNPH as a filter agent, and allows ketones such as aldehydes and acetone to pass through VOCs other than ketones.
  The sensor 5 is a constant potential electrolytic sensor and has sensitivity to formaldehyde and VOC, and has little sensitivity to ketones. Since the gas output characteristic is linear, the output is simply added when a gas composed of a plurality of single gases is sensed.
  That is, as shown in FIG. 9, the control device CP uses the detection value A by the sensor 5 when the primary sample supply is performed for 5 minutes as a reference value, and the reference value and the secondary sample supply when the secondary sample supply is performed for 5 minutes. The difference (B−A) in the detection value B by the sensor 5 is calculated, and this difference is measured as the formaldehyde concentration.
[0029]
  When the sensor 5 senses an interference gas such as ethanol, the detection result of the sensor 5 changes as shown in FIG. In this case, when detecting a change in the detection result at the time of supplying the primary sample, the control device CP automatically changes the measurement mode from the normal mode in FIG. 9 to the interference gas mode, and performs the measurement process as shown in FIG. Configured to do.
  That is, when the sample is supplied for 10 minutes by the least square method from the detected values A3, A4, and A5 of the sensor 5 when 3 minutes, 4 minutes, and 5 minutes have elapsed since the start of the primary sample supply. A predicted detection value C that is predicted to be obtained is calculated, a detection value D obtained by multiplying the prediction detection value C by 0.8 is calculated, and this calculation detection value D is used as a reference value. The difference (BD) from the detection value B by the sensor 5 when the sample is supplied for 5 minutes is calculated, and this difference is measured as the formaldehyde concentration.
[0030]
  When the measurement process of formaldehyde is completed, the control device CP digitally displays the measurement result on the liquid crystal display unit 1b of the operation panel 1 shown in FIG.
[0031]
  In this measuring apparatus, the filters 11 and 12 are operated between the inlets and outlets 6a and 6b of the gas passage 6 and the gas contact part 5a of the sensor 5 as described above. Instead of all the sample gas to be passed through the filters 11 and 12, only a part of the sample gas passes through the filters 11 and 12 and is supplied to the sensor 5. Thereby, it is possible to perform measurement while reducing the size of each filter 11 and 12 and extending the service life of each filter 11 and 12.
[0032]
  As shown in FIGS. 2 and 3, the gas passage 6 is formed of a resin block body supported by a lid body 32 connected to a pair of sheet metal frames 30 fixed inside the measurement case 4. And a bottomed hole provided in the filter pressing body 33 provided with the inlet 6a and the outlet 6b, and a through hole provided in the filter support 34 made of a resin plate fixed to the sensor 5. is there.
[0033]
  The filter loading / unloading device M includes a filter operating mechanism 20 having the filter loading / unloading motor 21, and rollers are rotatably attached to a plurality of locations on the filter pressing surface 33a of the filter pressing body 33 as shown in FIGS. There is provided a seal switching means 40 having a rotary pressing member side protrusion 41 and the like.
[0034]
  As shown in FIGS. 2 and 3, the filter operation mechanism 20 includes the filter insertion / removal motor 21 via the filter insertion / removal motor 21 and a gear-type reduction mechanism located inside the reduction case 25 that supports the motor 21. The screw shaft 26 interlocked with the output portion 21 and the holder transfer body 22 in which the female screw portion of the main body is externally fitted and screwed to the screw shaft 26 are configured.
[0035]
  The holder transfer body 22 is provided with an operation pin 22a protruding from the main body, and the operation pin 22a is slid and removed at one end of the filter holder 10 made of a resin plate by the mounting hole 13 shown in FIG. By being detachably mounted, the filter holder 10 is configured to engage with the filter holder 10 so as to be movable together. When the filter insertion / removal motor 21 is driven in the forward / reverse rotation direction, the screw shaft 26 is driven in the forward / reverse rotation direction by the driving force of the filter insertion / removal motor 21 to move the holder transfer body 22 to the main body. 3 is moved along the guide groove 27a of the guide member 27 of FIG. 3 that guides and prevents rotation, in the direction approaching the gas passage 6 or away from the gas passage 6, and the holder transfer body 22 is moved by the operation pin 22a. The filter holder 10 is formed along the holder passage 28 formed by the filter support 34 and the sheet metal frame 30 positioned on both sides of the filter support 34 and crossing the gas passage 6. Transport.
[0036]
  As a result, the filter operating mechanism 20 operates when the filter insertion / removal motor 21 is driven in the forward and reverse rotation directions. When activated, the filter holder 10 is moved to the holder passage 28 by the driving force of the filter insertion / removal motor 21. The two filters 11 and 12 are moved in and out of the gas passage 6 by moving along the gas passage 6, and the one filter 11 and 12 is inserted into the gas passage 6 to operate the sample gas. Then, the other filters 12 and 11 are operated in a non-use state where they are exposed to the outside from the gas passage 6.
[0037]
  The seal switching means 40 is configured to allow rollers to rotate freely at a plurality of locations on the plurality of pressing body side protrusions 41 provided on the filter pressing body 33 and the filter support surface 34a of the filter support body 34 as shown in FIGS. As shown in FIG. 5, the rotary support side protrusion 42 provided and the concave portions 43 and 44 provided at a plurality of positions on the side surface 10 a facing the filter support 34 of the filter holder 10, and the filter holder 10. Extrusion surface 45 formed by a portion of the side surface 10a that is disengaged from the concave portions 43, 44, and concave portions 46 provided at a plurality of locations on the side surface 10b of the filter holder 10 facing the filter pressing body 33 as shown in FIG. 47 and an extruding surface composed of a part of the side surface 10b of the filter holder 10 that is separated from the recesses 46, 47 as shown in FIGS. 8, are constituted by a sealing spring 49 provided inside of the pressing body accommodating chamber 35 to filter pressing body 33 of the lid 32 is assembled.
[0038]
  As shown in FIG. 3, a metal plate 36 is attached to the lower side of both lateral sides of the filter pressing body 33 to provide a pair of positioning portions 36 a that also serve as a detachment prevention, and the pressing body accommodating chamber 35 of the lid body 32 is formed. The filter pressing body 33 supports the filter only by a stroke in which the positioning portion 36a moves between a pair of stoppers 37 provided with a notch formed so that the positioning portion 36 enters the lateral end portion of the portion. The seal spring 49 is configured to move relative to the lid 32 in a direction approaching the body 34 or away from the filter support 34, and the seal spring 49 moves the filter pressing body 33 from the pressing body accommodating chamber 35 of the lid 32. It is slid in the exit direction.
[0039]
  As shown in FIGS. 7 (a) and 8 (a), when the first filter 11 enters the gas passage 6 and enters the operation state, the filter 11 is interposed between the filter holder 10 and the filter pressing body 33. Of the recesses 43, 44, 46, 47 of the filter holder 10 between the filter holder 10 and the filter support 34, the recesses 43, 46 closer to the first filter 11, and the pressing body side protrusion 41 and the support-side protrusion 42 coincide with each other, and the seal spring 49 urges the filter pressing body 33 so as to enter and urge the protrusions 41 and 42 into the recesses 43 and 46. Both the portion 41 and the support-side protrusion 42 enter the concave portions 43 and 46 that match the same, and a seal portion 51 provided around the first filter 11 of the filter holder 10 is provided. Since the filter pressing body 33 is urged and biased by the roll spring 49, the filter pressing body 33 is pressed against the filter pressing surface 33a to seal between the filter holder 10 and the filter pressing body 33. 34, the seal portion 53 provided around the gas passage 6 is pressed against the side surface 10a of the filter holder 10 for the biasing of the filter pressing body 33 by the seal spring 49, and the filter holder 10, the filter support 34, It is comprised so that it may be in the state which seals between.
[0040]
  As shown in FIGS. 7 (a) and 8 (c), when the second filter 12 enters the gas passage 6 and enters the operation state, the filter 12 is interposed between the filter holder 10 and the filter pressing body 33. Also, between the filter holder 10 and the filter support 34, the recesses 44, 47 closer to the second filter 12 among the recesses 43, 44, 46, 47 of the filter holder 10 and the pressing body side protrusions 41 and the support-side protrusion 42, and the seal spring 49 protrudes and urges the filter pressing body 33 so that the protrusions 41 and 42 enter the recesses 44 and 47 to be urged. Both the portion 41 and the support-side protrusion 42 enter the recessed portions 44 and 47 that match the same, and a seal portion 52 provided around the second filter 12 of the filter holder 10 is provided. The filter spring 33 is pressed against the filter pressing surface 33a of the filter pressing body 33 due to the biasing of the filter pressing body 33 by the roll spring 49, so that the filter holder 10 and the filter pressing body 33 are sealed. The seal portion 53 of 34 is pressed against the side surface 10a of the filter holder 10 for projecting and urging the filter pressing body 33 by the seal spring 49 to seal between the filter holder 10 and the filter support 34. It is constituted as follows.
[0041]
  When the filter holder 10 is moved to switch the first filter 11 and the second filter 12 from one of the operating state and the non-use state to the other as shown in FIGS. 7 (b) and 8 (b), The concave portions 43, 44, 46, 47 of the both side surfaces 10 a, 10 b of the filter holder 10 are separated from the pressing body side protrusion 41 and the supporting body side protrusion 42, and the extrusion surfaces 45, 48 are supported by the pressing body side protrusion 41. The filter pressing body 33 enters the back side of the pressing body accommodating chamber 35 against the seal spring 49 and the filter holder 10 and the filter support 34 are separated from each other. The filter holder 10 and the filter pressing body 33 are separated from each other, and the seal portions 51 and 52 of the filter holder 10 are filled with the filter pressing body 33. Becomes unsealing state is released the pressure contact against over the pressing surfaces 33a, the filter seal portion 53 of the support 34 are constituted to have the unsealing state is released the pressure contact against the side surface 10a of the filter holder 10.
[0042]
  As a result, the seal switching means 40 naturally executes the switching operation of the seal portions 51, 52, 53 as the filter holder 10 is moved by the seal operation mechanism 20, and the seal operation mechanism 20 performs the filter operation. When the holder 10 is being moved, each of the seal portions 51, 52, 53 is switched to the pressure release state and maintained in the pressure release state, and the seal operation mechanism 20 causes one of the filters 11, 12 to move. When the operation state is set, the seal portions 51 and 52 corresponding to the filters 11 and 12 in the operation state and the seal portion 53 of the filter support 34 are switched to the seal state.
[0043]
  Therefore, the filter insertion / removal device M operates the filter operation mechanism 20 by driving the filter insertion / removal motor 21, and moves the filter holder 10 by the filter operation mechanism 20 to move the two types of filters 11, 12. The gas passage 6 is put in and out at once. At this time, each seal portion 51, 52, 53 is switched to and maintained in the seal-released state by the seal switching means 40 that automatically performs the switching operation in accordance with the movement operation of the filter holder 10 by the filter operation mechanism 20, and the seal portion 51 is maintained. , 52 and 53 are made to insert and remove the filters 11 and 12 while preventing friction caused by sliding with respect to the filter pressing body 33 or the filter holder 10. When the filter operating mechanism 20 moves the filter holder 10 to the stroke end and puts one of the filters 11 and 12 into the gas passage 6, the seal switching means 40 that automatically performs the switching operation in accordance with this. Thus, of the two seal portions 51 and 52 provided in the filter holder 10, the seal portion 51 and 52 corresponding to the filter 11 and 12 in the activated state is placed against the filter pressing surface 33 a of the filter pressing body 33. The sealing portion 53 provided in the filter support 34 is switched to the sealing state pressed against the side surface 10a of the filter holder 10 so as to prevent the sample gas from leaking through the gas passage 6. Put it in a sealed state.
[0044]
  An example of the sealing material prepared as a separate part from the filter holder 10 is the seal part 51 provided around the first filter 11 of the filter holder 10 and the seal part 52 provided around the second filter 12. As shown in FIG. 4 or the like, the O-ring constituting the seal portions 51 and 52 is an annular seal material provided concentrically with the gas flow hole 14 in the filter holder 10. It is mounted in the assembly groove 15.
[0045]
  As shown in FIG. 6, the seal material assembling groove 15 is configured to sandwich the O-ring through the filters 11 and 12 by a pair of groove inner walls 15a and 15b. Of the pair of groove inner wall portions 15a and 15b, the outer end 15c of the groove inner wall portion 15b located on the outer side of the filter holder supports and supports the portion located on the outer side of the filter holder with respect to the centers 51a and 52a of the O-ring. It is constituted as follows. Thereby, the sealing material assembling groove 15 is supported by holding the O-ring, and friction is generated between the O-ring and the filter pressing body 33 when each of the recesses 46 and 47 starts to come off from the protrusion 41. Even so, the O-ring is supported so that it does not easily come off.
[0046]
As shown in FIG. 6, the O-ring assembled in the sealing material assembly groove 15 acts as a stopper on the filters 11 and 12 at the portions 51b and 52b located inside the filter holder. Is configured to be fixed to the inner wall portion 15a which is an assembly portion thereof.
[0047]
  Similarly to the seal portions 51 and 52 provided in the filter holder 10, the seal portion 53 provided in the filter support 34 is also configured by O-ring. The O-ring of the filter support 34 is also attached to the filter support 34 by a seal material assembly groove for supporting the O-ring by holding, similarly to the seal material assembly groove 15 of the filter holder 10.
[0048]
  As shown in FIG. 3 and the like, the lid body 32 is rotatably connected across the pair of sheet metal frames 30 via the connection pins 31 at the end portion supporting the filter pressing body 33. As shown in FIG. 1 (b), the swingable open / close filter replacement lid 55 provided on the rear plate of the measurement case 4 is opened and the lid is opened. By opening the body 32 and opening the holder passage 28, the filter holder 10 can be removed from the operation pin 22 a of the holder transfer body 22, and the filters 11, 12 can be removed together with the filter holder 10 from the filter loading / unloading device M for replacement. It is like that.
[0049]
    [Another embodiment]
  As in the above-described embodiment, the seal portions 51, 52, and 53 are distributed and provided between the filter holder 10 and the filter support 34, and are also distributed and provided between the filter holder 10 and the filter pressing body 33, or the filter pressing body. 33 and the filter support 34 may be provided separately, or may be provided only in the filter holder 10. When the members having the seal portion are made different in this way, the seal portion is pressed or the portion where the press contact is released is also different. Therefore, the filter pressing surface 33a, the side surface 10a of the filter holder 10 and the like are collectively referred to as contact target portions 33a and 10a.
[0050]
  When the seal switching means 40 is configured and implemented by providing the recesses 43, 44, 46, 47 and the protrusions 41, 42 as in the above embodiment, the protrusion is provided toward the filter holder 10 and the recess is pressed by the filter. You may comprise and implement by providing in the direction of the body 33 or the filter support body 34. FIG.
[0051]
  Instead of the seal spring 49, rubber or the like may be employed, and these are collectively referred to as the biasing means 49.
[0052]
  In addition to the apparatus for inserting and removing the filter so as to supply gas while always using the filter by selectively inserting the two types of filters 11 and 12 into the gas passage 6 as in the above embodiment, one filter is connected to the gas passage. The present invention can also be applied to an apparatus for inserting and removing a filter so as to switch between a case where gas is inserted and supplied and a case where the filter is taken out from the gas passage and supplied.
[0053]
  The filter operating mechanism 20 is implemented by using a power type that operates with the driving force of the motor 21 as in the above embodiment, and the lever or handle is manually swayed or rotated to manually operate the filter holder. You may implement by employ | adopting the manual type comprised so that a filter might be moved in and out with force with respect to a gas channel. Also in this manual type, the seal switching means performs the switching operation between the seal state and the seal release state of the seal portion in accordance with the operation of the operation mechanism 20. When entering, the seal part is naturally in a sealed state, or when the filter moves, the seal part is naturally in a seal-released state, thereby achieving the object of the present invention.
[Brief description of the drawings]
1A is a perspective view of an entire formaldehyde measuring apparatus, and FIG. 1B is an explanatory diagram of a filter replacement lid.
[Figure 2] Cross-sectional view of the filter loading / unloading device
FIG. 3 is a perspective view of the filter loading / unloading device with the lid open.
FIG. 4 is a perspective view of the filter holder with the filter removed.
FIG. 5 is a perspective view of the filter holder.
FIG. 6 is a cross-sectional view of the filter holder at the sealing material mounting portion.
7A is a longitudinal cross-sectional view of the seal switching means when the seal is operated, and FIG. 7B is a longitudinal cross-sectional view of the seal change means when the seal is released.
[Fig. 8] (A) is the seal operation when the first filter is used in the seal switching means.
(B) is a cross-sectional view of the seal switching means when the seal is released, and (c) is a cross-sectional view of the seal change means when the second filter is used.
FIG. 9 is an explanatory diagram showing the measurement procedure in the normal mode.
FIG. 10 is an explanatory diagram showing the measurement procedure in the interference gas mode.
[Explanation of symbols]
  6 Gas passage
  10 Filter holder
  10a, 33a Contact target part
  11,12 filter
  15 Sealing groove
  33, 34 passage forming member
  41, 42 protrusion
  43, 44, 46, 47 Recess
  45, 48 Extruded surface
  49 Energizing means

Claims (5)

An operation mechanism for moving the filter holder so that the filter enters and exits the gas passage ;
When off Iruta is activated condition entered the gas passage, becomes sealed state in which the sealing portion is pressed against the contact target portion for between the filter holder and the passage forming member that forms the gas passage, wherein upon movement of the filter holder, comprising a seal switching means for switching Rikae engineered to seal portion is unsealing state is released the press against the contact object portion,
The seal switching means includes a rotary protrusion provided on one of the passage forming member and the filter holder and provided with a rotatable roller, a recess and an extrusion surface provided on the other, and the protrusion. And an urging means for urging the seal portion against the contact target portion by urging the portion so as to enter the concave portion, and the protrusion portion as the filter holder is moved by the operation mechanism. A filter loading / unloading device configured to switch the seal portion into the sealed state by entering the recess, and to switch the seal portion to the seal release state when the protrusion comes into contact with the pushing surface . The seal switching means includes the protrusion provided on one of the passage forming member and the filter holder, and the concave portion and the pushing surface provided on the other on both sides of the filter holder in the gas passage. The filter putting in and out device according to claim 1.   The filter insertion / removal device according to claim 1 or 2, wherein the seal portion is a seal material produced as a separate part from the filter holder and attached to the filter holder.   The filter insertion / removal device according to claim 3, wherein the filter holder includes a sealing material assembly groove for holding the sealing material.   The filter insertion / removal device according to claim 3 or 4, wherein the sealing material is configured such that the filter is fixed to the assembly portion.

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