JP6170305B2 - Air filter unit, multi air conditioning system for buildings, air conditioner for air handling unit - Google Patents

Description

  The present invention relates to an air filter unit, a multi air conditioning system for buildings, and an air conditioner for an air handling unit.

  In a facility having a plurality of rooms such as a building, an air conditioner used for a multi air conditioning system for buildings and an air handling unit (hereinafter referred to as AHU) is known as an apparatus for air conditioning each room.

As a building multi-type air conditioner, for example, there is a ceiling-embedded indoor unit (see, for example, Patent Document 1). The indoor unit of Patent Document 1 is provided with a fan, a roll filter, a heat exchanger, and the like in a casing embedded in a ceiling. The roll filter is formed by winding a sheet-like prefilter around two rolls. In this indoor unit, the indoor air is taken into the casing by driving the fan, and the air is purified by passing through the roll filter at that time. The purified air is further subjected to heat exchange and supplied to the room.
In the indoor unit of Patent Document 1, the roll filter is disposed in a region adjacent to the bottom surface in the casing. When the prefilter becomes clogged and needs to be replaced, the unused area of the prefilter is pulled out from one roll, and the used area is wound around the other roll.

  On the other hand, as an air conditioner used for AHU, for example, an apparatus described in Patent Document 2 is known. In the air conditioner of Patent Literature 2, a roll filter, a filter unit, a fan, a heat exchanger, a humidifier, and the like are provided in a large casing installed in a dedicated room. The air conditioner is connected to each room through a duct, cleans the air taken in from the outside or each room, performs heat exchange, and sends the obtained conditioned air toward each room. A HEPA filter is used for the filter unit.

Japanese Patent No. 4857892 JP-B-2-35212

  The air conditioner of patent document 1 cleans air only with a pre-filter. In order to increase the cleanliness, if an intermediate performance filter or a high performance filter is further provided, a space for arranging these filters is required in the casing, resulting in an increase in size. In particular, in a ceiling-embedded indoor unit, space is limited, and thus either a prefilter, a medium performance filter, or a high performance filter must be selected. When a pre-filter is used, dust of minute size cannot be collected and cannot be highly purified. When a medium performance filter or a high performance filter is employed, clogging occurs immediately and the replacement frequency increases.

  On the other hand, in the air conditioner of Patent Document 2, air conditioning (adjustment of air temperature, humidity, etc.) is generally performed on a large scale, and a large area roll filter and filter unit are installed inside a large casing. ing. For this reason, compared with the filter replacement | exchange in the indoor unit etc. of the said patent document 1, work takes time.

  An object of this invention is to provide the compact air filter unit provided with two types of filters from which collection performance differs. Moreover, it aims at providing the multi air conditioning system for buildings provided with such an air filter unit, and the air conditioner for air handling.

One embodiment of the present invention is an air filter unit that collects fine particles in an air current. The unit is
A main collector having a pleated main filter;
A pre-collecting unit that is arranged on the upstream side of the airflow and collects some fine particles with respect to the main collecting unit,
The pre-collecting unit has a pair of rollers spaced apart from each other and a long sheet-like prefilter wound around the pair of rollers, and one of the pair of rollers The unused area of the prefilter is pulled out to move the unused area to the front surface of the main filter, and the used area of the prefilter is wound around the other roller of the pair of rollers. And
The main collection part is fixed in contact with the main filter, a frame body that holds an outer peripheral side end of the main filter, an attachment jig that is attached to the frame body and supports the shaft of the roller, Further comprising
The main collection unit is provided so as to be sandwiched between the pair of rollers, and the main filter is disposed between the main collection unit and the pre-filter located in front of the main filter. The distance between the pair of rollers is smaller than the diameter of the pair of rollers, and is disposed opposite to the prefilter .
The upstream end of the roller is located upstream of the main collection portion so that the pre-filter located on the front surface of the main filter is disposed away from the main filter .

  It is preferable that the main collection unit further includes a regulating member that regulates that the pre-filter spanned between the rollers bends away from the main filter.

Another aspect of the present invention is an air filter unit that collects fine particles in an airflow, and the unit includes:
A main collector having a main filter;
A pre-collecting unit that is arranged on the upstream side of the air flow with respect to the main collecting unit and collects some fine particles;
A casing having a first lid and a second lid fitted together,
The pre-collecting unit has a pair of rollers spaced apart from each other and a long sheet-like prefilter wound around the pair of rollers, and one of the pair of rollers The unused area of the prefilter is pulled out to move the unused area to the front surface of the main filter, and the used area of the prefilter is wound around the other roller of the pair of rollers. And
The main collecting portion is provided so as to be sandwiched between the pair of rollers, and said main filter, between the pre-filter positioned in front of the main filter and the main catching collection unit The distance between the pair of rollers is smaller than the diameter of the pair of rollers.
The pre-collecting unit is attached to one of the first lid and the second lid, and the main collecting unit is attached to the other of the first lid and the second lid,
The main filter and the pre-filter are disposed to face each other by fitting the first lid and the second lid.

  In the pre-filter, it is preferable that a use area corresponding to a filter area of the main filter is partitioned by a mark.

  It is preferable that the total amount of life of each pre-filter used region is equal to the life of the main filter.

Another aspect of the present invention is a multi-air conditioning system for buildings including a plurality of indoor units and outdoor units. The air conditioning system
Said plurality of respective indoor units having said air filter unit, and a heat exchanger for exchanging heat between the air taken in from the room through the air filter unit,
The outdoor unit includes another heat exchanger connected to the heat exchanger of the indoor unit so that the refrigerant circulates between the plurality of indoor units.

Yet another embodiment of the present invention is an air conditioner for an air handling unit that supplies air to a plurality of rooms. The air conditioner
The air filter unit;
A heat exchanger that exchanges heat with the air taken in via the air filter unit using an external heat source;
A humidifier to adjust the humidity,
A fan for sending heat-exchanged air toward the plurality of rooms;
A casing that houses the air filter unit, the heat exchanger, and the humidifier.

  According to the present invention, a compact air filter unit including two types of filters having different collection performances is provided. Moreover, the building multi-air conditioning system provided with such an air filter unit and the air handling unit air conditioner are provided.

It is a perspective view of the air filter unit of this embodiment. (A) is a side view of the air filter unit of the present embodiment, (b) is a bottom view of the air filter unit, and (c) is a view showing a pre-collecting portion of the air filter unit. . (A) is a figure explaining the positional relationship of the pre collection part of the air filter unit of this embodiment, and the main collection part, (b) is a figure which shows the modification. It is a figure which shows schematic structure of the multi air conditioning system for buildings of this embodiment. It is a figure which pays attention to an air filter unit and shows an indoor unit of a multi air conditioning system for buildings of this embodiment. (A) is a figure which shows the modification of the indoor unit of FIG. 5, (b) is a figure which decomposes | disassembles and shows the air filter unit used by this modification. It is a figure which shows schematic structure of the air conditioning system containing the air conditioner for air handling units of this embodiment. It is a figure which pays attention to an air filter unit, and shows an air conditioner for air handling units of this embodiment.

  Hereinafter, an air filter unit, a multi air conditioning system for buildings, and an air conditioner for an air handling unit according to the present invention will be described in detail.

(Air filter unit)
FIG. 1 shows an air filter unit (hereinafter simply referred to as a unit) 1 according to an embodiment of the present invention. 2A is a side view of the air filter unit of the present embodiment, FIG. 2B is a bottom view of the air filter unit, and FIG. 2C shows a pre-collecting portion of the air filter unit. FIG.
The unit 1 collects fine particles such as dust in the airflow. The unit 1 includes a main collection unit 3 and a pre-collection unit 5.

The main collection unit 3 includes a main filter 11 and a frame body 13.
The main filter 11 is a filter for collecting minute dust that has passed through the pre-collecting unit 5. For this reason, the following medium performance filter or high performance filter is preferably used.
The medium performance filter is a filter used for removing dust having a particle diameter of 1 μm or more and a concentration of 0.1 to 6 mg / m ³ . As a medium performance filter, the collection efficiency is 90 to 96% by gravimetric method (mass method), 50 to 80% by colorimetric method (light scattering integration method), 5 to 50% by counting method, pressure A material having a loss of 79 to 247 Pa and a dust holding capacity of 300 to 800 g / m ³ is used. In measuring the collection efficiency, the gravimetric method uses 15 kinds of powders defined in JIS Z8901 or dusts defined by the American Society of Heating, Refrigerating and Air-Conditioning (ASHRAE). In the colorimetric method, 11 kinds of powders defined in JIS Z8901 are used. In the counting method, particles of atmospheric dust, polyalphaolefin (PAO), or silica having a particle diameter of 0.3 mm are used. The dust holding capacity is the amount of dust collected until the filter reaches a predetermined final pressure loss.
The high-performance filter is a filter used for removing dust having a particle size of 1 μm or less and a concentration of 0.3 mg / m ³ or less. As the high-performance filter, a filter having a collection efficiency by counting method of 80% or more, a pressure loss of 79 to 493 Pa, and a dust holding capacity of 200 to 800 g / m ³ is used.

  Specifically, the main filter 11 is made of a non-woven fabric, mat, or felt-like filter medium made of glass fiber or synthetic fiber and subjected to pleating. In the state in which the filter medium is housed in the frame 13, the pleat interval is maintained by a hot melt ribbon, a separator, or an emboss protrusion provided on the surface of the filter medium. The main filter 11 may be subjected to electret processing. Thereby, the collection performance by the fibers of the filter medium being charged is given to the original collection performance of the filter medium. Moreover, the main filter 11 may give an antibacterial performance by performing an antibacterial treatment for attaching an antibacterial agent. These electret treatments and antibacterial treatments may be performed in combination.

  The frame 13 holds the outer peripheral side end of the main filter 11. The frame body 13 is made by combining frame materials such as a zinc iron plate and a stainless steel plate, and keeps the main collection portion 3 in a flat plate shape. The main filter 11 is fixed to the frame 13 with an adhesive such as hot melt.

The pre-collecting unit 5 is disposed on the upstream side of the airflow with respect to the main collecting unit 3 and collects relatively coarse dust. The pre-collecting unit 5 includes a pair of rollers 21 and 23 and a pre-filter 25.
The rollers 21 and 23 are spaced apart from each other and arranged substantially in parallel. Specifically, rollers 21 and 23 is arranged at a slightly longer distance than the lateral (toward the horizontal direction in FIG. 1) the length of the main catching collection unit 3. Of the pair of rollers 21 and 23, the roller 21 is a roller for winding the prefilter 25. An unused area of the prefilter 25 is wound around the roller 23. The shafts (not shown) of the rollers 21 and 23 are made of, for example, a hollow paper tube, and can be discarded together with the used prefilter 25 when the unit 1 is replaced. A handle 27 that is rotated is attached to one end of the shaft of the roll 21. Specifically, the handle 27 is provided with a shaft that is screwed into the paper tube of the roller 21 and is fixed by, for example, a pin that penetrates the paper tube so that the shaft does not slide and rotate within the paper tube.

The prefilter 25 is a long sheet-shaped filter medium wound around the rollers 21 and 23. For example, both ends of the pre-filter 25 are attached to the shafts of the rollers 21 and 23 with double-sided tape at both ends in the longitudinal direction. The pre-filter 25 is a filter used for removing dust having a particle size of 5 μm or more and a concentration of 0.4 to 7 mg / m ³ . The prefilter 25 has a collection efficiency of 70 to 90% by weight method, 15 to 40% by colorimetric method, 5 to 10% by counting method, pressure loss of 30 to 296 Pa, and dust retention The capacity is 500 to 2000 g / m ³ . The same particles as described above for the main filter 11 are used as the particles used for measuring the collection efficiency. For the prefilter 25, specifically, a nonwoven fabric, a mat, or a felt-like filter medium made of glass fiber or synthetic fiber is used. The prefilter 25 may be subjected to the above electret treatment and antibacterial treatment.

In the pre-catching collection unit 5, that the handle 27 is rotated, together with the used area of the prefilter 25 is wound around the roller 21, unused area of the prefilter 25 is pulled out from the roller 23, the main filter 11 The unused area moves to the front surface (upstream surface). The pre-collecting unit 5 may be provided with a gear instead of the handle 27 so that the pre-filter 25 is automatically wound. In this case, another gear and a motor meshing with the gear are provided in the casing of the air conditioner in which the unit 1 is installed. The feed amount of the pre-filter 25 can be controlled by a known method. For example, the rotation speed of the roller 21 may be detected by a limit switch, and the roller 21 may be stopped when it is counted a predetermined number of times.

The main catching collection unit 3 is provided so as to be sandwiched between a pair of rollers 21, 23. As shown in FIG. 2A, the thickness of the main collection part 3 (vertical length in FIG. 1) is the same as the thickness of the frame 13, but the thickness of the main collection part 3 is not particularly limited. . The main collection part 3 should just be provided so that the plane containing the axis | shafts of the rollers 21 and 23 may be interrupted, for example, and the thickness of the main collection part 3 may be larger or smaller than the diameter of the rollers 21 and 23. Or they may be equal. Further, a main capturing collection unit 3, the distance between the pre-filter 5 located on the front surface of the main filter 11 so as to be smaller than the diameter of the pair of rollers 21 and 23, the main filter 11, pre-filter 5 is disposed opposite to 5. The distance between the main catching collecting section 3 and the pre-filter 25, between the frame 13 and the pre-filter 25, a vertical gap of FIG. Note that the distance between the frame 13 and the pre-filter 25 shown in FIG. 1 and the like is exaggerated and long for explanation. The diameters of the rollers 21 and 23 are the diameter including the prefilter 25 in a state where the prefilter 25 is wound, and the distance may be smaller than the larger one. In addition, the distance between the main collection part 3 and the pre-filter 25 located in the front surface of the main filter 11 is the case where the front-end | tip of the upstream of the main filter 11 is distribute | arranged upstream from the frame 13, or When the main collection part 3 does not have the frame 13, it means the distance between the main filter 11 and the pre-filter 25.

  It is preferable that the main collection unit 3 further includes an attachment jig 15 that is attached to the frame 13 and supports the shafts of the rollers 21 and 23. The attachment jigs 15 are attached to the four apex angles of the frame 13 one by one. Specifically, the mounting jig 15 is attached to both ends of two side surfaces of the four side surfaces of the frame body 13 other than the side where the rollers 21 and 23 are arranged, and a part protrudes outward from the frame body 13. It is attached to do. Thereby, on the two side surfaces of the frame 13, the rollers 21 and 23 can be sandwiched between the two mounting jigs 15, and the shafts of the rollers 21 and 23 can be supported. Although the shape of the mounting jig 15 is not shown in detail, for example, a U-shaped cross section is used. The mounting jig 15 is fixed to the frame 13 with rivets 15a, and is provided with screws 15b inserted into both ends of the shafts of the rollers 21 and 23, so that the rollers 21 and 23 are rotatable. Yes. In this way, the main collection unit 3 and the pre-collection unit 5 are integrated. According to such a unit 1, the main collection part 3 and the pre-collection part 5 can be collectively removed from the air conditioner and attached, and the working time is less than when these are installed separately. I'll do it.

The main collection unit 3 preferably further includes a regulating member (not shown) that regulates the prefilter 25 wound around the rollers 21 and 23 from being bent toward the side away from the main filter 11. For example, the regulating member is provided with a slight gap between the pre-filter 25 and the frame body 13 so as to sandwich the end portion of the pre-filter 25 in the width direction (vertical direction in FIG. 2B) with the frame body 13. It may be a member having a curved surface. Further, for example, a roller member that feeds out the end portion of the pre-filter 25 in the width direction between the frame body 13 and rotates may be used. A strong pre-filter 25 or the like may bend away from the main filter 11 between the roller 21 and the roller 23. By providing the regulating member, the gap between the main collection unit 3 and the prefilter 25 can be shortened.
Further, instead of using the regulating member, or in combination with using the regulating member, the prefilter 25 may be wound around the rollers 21 and 23 as shown in FIG. FIG. 3A is a view for explaining the positional relationship between the pre-collecting unit and the main collecting unit of the air filter unit of the present embodiment, and FIG. 3B is a diagram showing a modification thereof. In the present embodiment, the prefilter 25 is wound around rollers 21 and 23 as shown in FIG. Instead, as shown in FIG. 3 (b), the prefilter 25 comes into contact with both ends of the frame 13 in the lateral direction (left and right direction in FIG. 3) by winding it around the rollers 21 and 23, and the upstream side. The bending to is suppressed.

  As shown in FIG. 2C, the prefilter 25 preferably has a use area that is matched with the filter area of the main filter 11 defined by an identification line (mark) 26. The prefilter 25 includes, for example, five use areas. The operator can reliably wind up the used area by rotating the handle 27 while visually confirming the position of the identification line 26. The form of the identification line 26 is not particularly limited, and may be other types of lines, patterns, etc., and is provided so that it can be distinguished from other regions by heat sealing or embossing. Also good.

  In the unit 1, it is preferable that the total life of the prefilter 25 for each usage region is equal to the life of the main filter 11. The lifetime refers to the time from when the filter is used until the predetermined pressure loss (final pressure loss) is reached. For example, when the prefilter 25 includes five use areas, the life of the main filter 11 is set to five times the life of one use area of the prefilter 25. The two lifetimes are made equal by selecting the filter medium to be used for each filter and setting the folding width and number of pleats of the main filter 11 in accordance with the lifetimes thus determined. According to such a configuration, when the last use area of the pre-filter reaches the end of its life, the main filter 11 also reaches the end of its life, so that both filters can be replaced together when the unit 1 is replaced. When the pre-collecting unit 5 and the main collecting unit 3 are integrated, the filters 11 and 25 can be exchanged together with the exchange of the unit 1, which is more convenient.

  As the pre-filter and main filter of the unit 1 described above, those having the following specifications and performance can be exemplified. In addition, all are the specifications at the time of pinching | interposing the main collection layer of length 610mm * width 610mm * height 65mm with the roller of the pre collection layer about 70 mm in diameter. The vertical, horizontal, and height are respectively the depth direction, the horizontal direction, and the vertical direction in FIG.

(A) pre-filter thickness 0.21 mm, basis weight 60 g / ^{m 2,} average fiber diameter of about 50 [mu] m, the filter medium area 0.37 m ² polyester resin spunbonded nonwoven fabric.
Collection efficiency (mass method): 70%
Pressure loss (filtration rate 5.3 cm / sec): 10 Pa
Dust holding amount: about 500 g / m ²

(B) Main filter A polypropylene resin meltblown nonwoven fabric having an average fiber diameter of about 2 μm is subjected to electret treatment, and a polyester resin thermal bond nonwoven fabric having an average fiber diameter of about 30 μm is used as a reinforcing material on one side of the main filter medium. a reinforcing member formed by joining by thermal lamination, thickness 0.63 mm, basis weight 133 g / ^{m 2,} the filter medium of the filter medium area 8m ^2.
Collection efficiency (colorimetric method): 90%
Initial pressure loss (air flow 53 m ³ / min): 83 Pa
Dust holding amount: about 340 g / m ²
Life: About 5 times the life of prefilter

Each specification and performance described above are measured by, for example, the following measurement methods.
(thickness)
The thickness when a load of 2.5 N at 10 mmφ is applied to the test sample is measured using a dial thickness gauge.
(Weight)
The weight of a 100 mm × 100 mm test piece taken from the test sample is measured, and is calculated by converting to the weight per 1 m ² .
(Average fiber diameter)
Two perpendicular lines are drawn on the image of the surface of the test sample taken with a scanning electron microscope (SEM), and the thickness of the fiber image that intersects these lines is measured as the fiber diameter. Is the average fiber diameter.

(Main filter collection efficiency)
In accordance with JIS B9908 type 2, JIS11 class dust-containing air specified in JIS Z8901 is allowed to pass at a test wind speed of 2.5 m / second, and the dust before and after passing is measured by the light scattering light quantity integration method according to JIS Z8813. Concentration is measured continuously at the same time, and the collection efficiency is determined by the following formula.
Collection efficiency (%) = (Dust concentration after passing (number / L) −Dust concentration before passing (number / L)) / (Dust concentration before passing (number / L)) × 100
(Prefilter collection efficiency)
In accordance with JIS B 9908 Format 3, the collection efficiency at a test wind speed of 2.5 m / sec is measured with a JIS 11 type dust specified in JIS Z8901 using a vertical test apparatus.

(Initial pressure loss)
The pressure loss at a wind speed of 2.5 m / sec is measured using a duct having a size of 610 mm × 610 mm in accordance with JIS B9908 Format 2 and Format 3.
(Dust retention)
In accordance with JIS B 9908 Format 2 and Format 3, the pressure loss at a dust concentration of 70 ± 30 mg / m ³ and a test wind speed of 2.5 m / sec, using the JIS11 type powder specified in JIS Z8901, is the final pressure loss (pre- The amount of dust supplied until it reaches 200 Pa for the filter and 294 Pa for the main filter is measured.
(lifespan)
In accordance with JIS B 9908 Format 2 and Format 3, the pressure loss at a dust concentration of 70 ± 30 mg / m ³ and a test wind speed of 2.5 m / sec, using the JIS11 type powder specified in JIS Z8901, is the final pressure loss (pre- The time required to reach 200 Pa for the filter and 294 Pa for the main filter is measured.

  Since the above unit 1 includes the pre-collecting unit 5 and the main collecting unit 3 having two different collection performances, the pre-filter 25 burdens the main filter 11 while achieving high cleaning by the main filter 11. Thus, the life of the main filter 11 can be extended, and the frequency of replacement can be reduced. And according to the unit 1, the main filter 11 is arrange | positioned so that it may be pinched | interposed between the rollers 21 and 23, and the distance of the main collection part 3 and the pre filter 25 is compared with the diameter of the rollers 21 and 23. It is arranged opposite to the prefilter 25 so as to be small. For this reason, the unit 1 is smaller in thickness than the sum of the lengths in the thickness direction of the main collection unit 3 and the pre-collection unit 5 and is made compact. Therefore, in the air conditioner provided with the pre-collecting unit, the main collecting unit 3 can be arranged without further providing a space for the main collecting unit 3. Further, since the unit 1 is made compact, when installing a pre-filter and a main filter having a large area, the removal and attachment work can be performed easily.

(Multi air conditioning system for buildings)
Next, the multi air conditioning system for buildings of this embodiment will be described.
FIG. 4 is a diagram showing a schematic configuration of a building multi-air conditioning system (hereinafter simply referred to as a system) 31 according to the present embodiment.

  The building multi-air conditioning system 31 includes a plurality of indoor units 41 and a single outdoor unit 43. Each indoor unit 41 is installed in each room in a building, for example, and the outdoor unit 43 is installed outside the building including the rooftop of the building. Each of the indoor units 41 and the outdoor unit 43 includes a heat exchanger, and a pipe through which the heat exchangers of the indoor unit 41 and the outdoor unit 43 pass so that the refrigerant circulates between the indoor unit 41 and the outdoor unit 43. Connected by. Each of the indoor units 41 can individually set the temperature, the air volume, and the like. The installation mode of the indoor unit 41 is not particularly limited, and may be a ceiling-embedded type, a floor-standing type, a wall-mounted type, or the like. For example, a ceiling embedded type.

FIG. 5 is a diagram showing the indoor unit 41 of the system 31 according to the present embodiment, paying attention to the unit 1. The indoor unit 41 includes a casing 53, and the casing 53 includes a main body casing 54 and a grill 55.
The main casing 54 is provided with a fan 52, a heat exchanger (not shown), a drain pan, and a control device. The fan 52 is rotationally driven to take indoor air into the casing 53 and supply the air into the room from a blowout port (not shown) provided in the main body casing 54. The drain pan receives water condensed in the heat exchanger and discharges it to the outside. The control device communicates with a remote controller or the like to control the fan 52 according to the set temperature and the air volume. A bottom surface of the main casing 54 is opened, and a grill 55 is attached.

The grill 55 is provided with a mesh or the like (not shown) on the bottom surface for taking in indoor air. The unit 1 is attached to the grill 55 via a fastener 55 a, and the unit 1 is attached to the main body casing 54 integrally with the grill 55.
The unit 1 is attached to the grill 55 so that the prefilter 25 faces downward. The unit 1 and the grill 55 are arranged to face each other so that the prefilter 25 is sandwiched between the frame 13 and the grill 55, but are arranged with a slight gap so that the prefilter 25 can move. . A gasket is provided between the unit 1 and the main casing 54 to prevent the entry of uncleaned air. In the unit 1 of the present embodiment, for example, a gear 28 is attached to the other end of the shaft of the roller 21 to which the handle 27 is attached. The grill 55 is provided with another gear 58 that meshes with the gear 28, and an operation rod 57 that is rotated by an operator when the prefilter is wound can be inserted into the gear 58. . In FIG. 5, for the sake of explanation, the operation rod 57 is shown inserted into the gear 58. The mounting jig 15 attached to the apex angle of the unit 1 adjacent to the gear 28 is not shown. The operation rod 57 rotates coaxially with the gear 58, and a disc, a handle, and the like for rotation operation may be appropriately provided at a lower end (not shown). The operator can rotate the operation rod 57 to rotate the gear 28 to rotate the roller 21 and wind up the used region of the pre-filter 25.

The indoor unit 1 may be provided with a function for notifying the replacement time of the prefilter 25. The replacement here means that the used area of the pre-filter 25 is wound up and the unused area is moved to the front surface of the main filter 11. The exchange time can be notified by a known method. For example, the operation time of the fan 52 may be accumulated by the control device and notified when the predetermined value is reached, or the decrease in the transmitted light amount due to the filter clogging is detected by the transmission type sensor and the predetermined amount is decreased. You may be informed if you do. Further, for example, when the pressure loss reaches a predetermined magnitude, it may be determined that the service life has been reached and notified. Further, the replacement time can be notified by a known method, and can be performed by, for example, displaying on an LED provided in the indoor unit 41, a liquid crystal display unit, etc., or outputting sound such as a chime sound. Further, the indoor unit 1 may be provided with the above-described automatic winding function when it is time to replace the prefilter 25.
The outdoor unit 43 is provided with a fan and a heat exchanger in the casing.

In this system 31, the fan 52 of the indoor unit 41 is rotationally driven, so that indoor air passes through the unit 1 from the bottom side and is taken into the casing 53. At this time, cleaning is performed by the pre-filter 25 and the main filter 11. The purified air contacts the heat exchanger in the casing 53 to exchange heat with the refrigerant, and is blown out into the room from the outlet.
The unit 1 used in the system 31 is compact by arranging the main collection unit 3 in a space between the rollers 21 and 23 of the pre-collection unit 5. It is not necessary to provide a separate space for arranging the collecting unit 3. Further, in the indoor unit 41, when the prefilter 25 reaches the end of its life, the roller 21 is rotated by rotating the operation rod 57 to wind up the used area and draw the unused area from the roller 23. Further, when the main filter 11 reaches the end of its life, the unit 1 can be removed from the main body casing 54 together with the grill 55, and the entire frame 13 can be replaced with a new main collecting portion 3. At that time, the prefilter 25 can be replaced at the same time.

(Modification)
Here, a modified example of the indoor unit 41 will be described.
Fig.6 (a) is a figure which shows the modification of the indoor unit 41 of FIG. 5, (b) is a figure which decomposes | disassembles and shows the air filter unit of the modification. In addition, in FIG. 6, the pre collection part 5 and the casing 17 of the unit 1 show the cross section of a depth direction.

  In this modification, the unit 1 of the indoor unit 41 uses the casing 17 having the upper lid 18 and the lower lid 19 that are fitted to each other instead of the mounting jig 15, so that the main collection unit 3 and the pre-collection unit are used. 5 is integrated. Specifically, the pre-collecting unit 5 is attached to the upper lid 18, the main collecting unit 3 is attached to the lower lid 19, and the upper lid 18 and the lower lid 19 are fitted to each other as shown in FIG. 6 (b). When combined, both parts are integrated. For the sake of convenience, the upper lid 18 and the lower lid 19 are referred to as the upper lid 18 and the smaller one as the lower lid 19 for the sake of convenience, and are not related to the actual vertical relationship between the positions. The shafts of the rollers 21 and 23 of the pre-collecting unit 5 are fixed to the upper lid 18, and the frame 13 of the main collecting unit 3 is attached to the lower lid 19. The main filter 11 and the pre-filter 25 are disposed to face each other by fitting the upper lid 18 and the lower lid 19 together. The unit 1 can be attached to and detached from the bottom surface of the main body casing 54 in a state where the upper lid 18 and the lower lid 19 are fitted together. The means for attaching is not particularly limited, and for example, has a structure in which the casing 17 can be engaged with the main body casing 54. In addition, it is preferable that a gasket for preventing leakage between the bottom cover 19 and the main casing 54 is provided on the bottom surface.

According to this modification, when the main filter 11 reaches the end of its life, the unit 1 is removed by first removing the grill 55 from the main body casing 54 and then removing the casing 17 from the main body casing 54. And the main collection part 3 and the pre collection part 5 can be replaced | exchanged collectively by attaching the new unit 1 to the bottom face of the main body casing 54 in the state in which the upper cover 18 and the lower cover 19 were fitted together. .
Instead of the above-described aspect of the casing 17, the upper lid 18 is attached to the grill 55 of the indoor unit 41, the lower lid 19 is attached to the bottom surface of the main body casing 54, and the grill 55 is attached to the main body casing 54. The upper lid 18 and the lower lid 18 may be fitted together.

(Air conditioner for AHU)
Next, the AHU air conditioner 61 will be described.
FIG. 7 is a diagram illustrating a schematic configuration of a system including an AHU air conditioner (hereinafter simply referred to as an air conditioner) 61 according to the present embodiment.
The air conditioner 61 is installed in a building having a plurality of rooms, such as a building or a commercial facility, and is installed in a dedicated room, for example. The air conditioner 61 is connected to each room in the building (only one is shown in FIG. 7) via the return air duct 62 and the air supply duct 63, and the air in each room sucked from the air inlet 64. Is carried into the air conditioner 61 through the return air duct 62, and the conditioned air is supplied from the supply port 65 to each room through the intake duct 62 in the air conditioner 61. The conditioned air is air whose temperature and humidity are adjusted at least.
In the air conditioner 61, the unit 1, the heat exchanger 73, the humidifier 75, and the fan 77 are arranged in the casing 71 in order along the flow path of the taken-in air. In the present embodiment, a unit 1 is used in which a plurality of (for example, eight) main collection parts 3 are arranged in a planar direction and connected to each other. In accordance with this, the pre-collecting unit 5 is also enlarged, and the sizes of the pre-filter 25 and the rollers 21 and 23 are determined. The heat exchanger 73 is connected to a chiller / heater provided separately from the air conditioner 61 and a boiler, and is provided with a coil through which chilled water, hot water, and steam are supplied. As the humidifier 75, for example, a high-pressure water spray type is used. The fan 77 takes air into the casing 71 and sends out conditioned air to each room through the intake duct 63. Note that another fan for mainly taking in air may be provided on the upstream side of the unit 1.

FIG. 8 is a diagram showing the air conditioner 61 of the present embodiment, paying attention to the air filter unit. The unit 1 is attached to a partition portion 71a that extends from the outer portion of the casing 71 to the inside to form a chamber so as to cover the air flow path. Further, the casing 71 is provided with a window 72 for confirming the state in the casing 71 from the outside, so that the operator can see the unit 1.
In the unit 1, the main collection unit 3 and the pre-collection unit 5 are integrated by a casing 17 having the upper lid 18 and the lower lid 19 as described in the modification of the system 41 described above. In the present embodiment, the gear 58 that meshes with the gear 28 is provided in a different direction from the gear 58 in the system 31 described above, and the operation rod 57 is attached so as to extend in the planar direction of the unit 1. The prefilter 25 is wound up by rotating the operation rod 57 outside the casing 71.

In this air conditioner 61, the unit 1 is more compact in the thickness direction than that in which the main collection unit and the pre-collection unit are separately provided, and can be removed and attached smoothly. In the air conditioner 61, the prefilter 25 can be wound up by operating the operating rod 57 while confirming the position of the identification line 26 of the prefilter 25 from the window 72 of the casing 71. When the main filter 11 reaches the end of its life, it enters the casing 71 to remove the unit 1 from the partition 71a in order to remove the unit 1. Again, the unit 1 can remove the main collection part 3 and the pre collection part 5 integrally by removing in the state which the upper cover 18 and the lower cover 19 were fitted. Then, the main filter 11 and the prefilter 25 can be exchanged together.
In the conventional AHU, since the main collection part and the roll filter (pre-collection part) were installed separately, when replacing, each was removed, and further, after replacing each removed part with a new filter, Each part in which the filter was replaced had to be installed in the casing. In particular, in AHU, since the main collection part and the pre-collection part which were enlarged in area are used, this work has taken time. According to the air conditioner 61 described above, it can be removed and attached in a single operation.
In addition, the unit 1 of the air conditioner 61 is replaced with the casing 17 having the upper lid 18 and the lower lid 19, and the main collection unit 3 and the pre-collection unit 5 are integrated using the mounting jig 15. Good.

  As described above, the air filter unit, the building multi-air conditioning system, and the air handling unit air conditioner have been described in detail. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. Of course, improvements and changes may be made.

DESCRIPTION OF SYMBOLS 1 Air filter unit 3 Main collection part 5 Pre collection part 11 Main filter 13 Frame 15 Mounting jig 17 Casing 18 Upper cover 19 Lower cover 21, 23 One pair of rollers 25 Pre filter 26 Identification line (mark)
31 Multi air conditioning system for buildings 41 Indoor unit 43 Outdoor unit 61 Air conditioner for air handling unit

Claims (8)

An air filter unit that collects particulates in an air current,
A main collector having a pleated main filter;
A pre-collecting unit that is arranged on the upstream side of the airflow with respect to the main collecting unit and collects some fine particles;
The pre-collecting unit has a pair of rollers spaced apart from each other and a long sheet-like prefilter wound around the pair of rollers, and one of the pair of rollers The unused area of the prefilter is pulled out to move the unused area to the front surface of the main filter, and the used area of the prefilter is wound around the other roller of the pair of rollers. And
The main collection part is fixed in contact with the main filter, a frame body that holds an outer peripheral side end of the main filter, an attachment jig that is attached to the frame body and supports the shaft of the roller, Further comprising
The main collecting portion is provided so as to be sandwiched between the pair of rollers, and said main filter, between the pre-filter positioned in front of the main filter and the main catching collection unit The distance between the pair of rollers is smaller than the diameter of the pair of rollers, and is disposed opposite to the prefilter.
The upstream end of the roller is located upstream from the main collection portion so that the pre-filter located in front of the main filter is disposed away from the main filter. A featured air filter unit.   2. The air filter unit according to claim 1, wherein the main collection unit further includes a regulating member that regulates bending of the pre-filter wound around the pair of rollers to the side away from the main filter. An air filter unit that collects particulates in an air current,
A main collector having a main filter;
A pre-collecting unit that is arranged on the upstream side of the air flow with respect to the main collecting unit and collects some fine particles;
A casing having a first lid and a second lid fitted together,
The pre-collecting unit has a pair of rollers spaced apart from each other and a long sheet-like prefilter wound around the pair of rollers, and one of the pair of rollers The unused area of the prefilter is pulled out to move the unused area to the front surface of the main filter, and the used area of the prefilter is wound around the other roller of the pair of rollers. And
The main collecting portion is provided so as to be sandwiched between the pair of rollers, and said main filter, between the pre-filter positioned in front of the main filter and the main catching collection unit The distance between the pair of rollers is smaller than the diameter of the pair of rollers.
The pre-collecting unit is attached to one of the first lid and the second lid, and the main collecting unit is attached to the other of the first lid and the second lid,
The main filter and the pre-filter are air filter units that are arranged to face each other by fitting the first lid and the second lid.   The air filter unit according to any one of claims 1 to 3, wherein in the pre-filter, a use area corresponding to a filter area of the main filter is partitioned by a mark. The pre-filter has a plurality of use areas that match the filter area of the main filter,
The air filter unit according to any one of claims 1 to 3, wherein the total amount of life of each pre-filter used region is equal to the life of the main filter.   The air filter unit according to claim 4, wherein the total amount of life of each pre-filter used area is equal to the life of the main filter. A multi air conditioning system for buildings comprising a plurality of indoor units and outdoor units,
Each of the plurality of indoor units exchanges heat between the air filter unit according to any one of claims 1 to 6 and air taken in from the room through the air filter unit. And having
The multi-air conditioning system for buildings, wherein the outdoor unit has another heat exchanger connected to the heat exchanger of the indoor unit so that the refrigerant circulates between the plurality of indoor units. An air conditioner for an air handling unit that supplies air to a plurality of rooms,
The air filter unit according to any one of claims 1 to 6,
A heat exchanger that exchanges heat with the air taken in via the air filter unit using an external heat source;
A humidifier to adjust the humidity,
A fan for sending heat-exchanged air toward the plurality of rooms;
An air conditioner for an air handling unit, comprising: the air filter unit, the heat exchanger, and a casing that houses the humidifier.

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