Filter box and ventilation system

Abstract

To provide a filter box and a ventilation system that can improve maintainability.SOLUTION: A filter box 40 is used in a general ventilation system 1, and comprises a case 41 comprising an air exhaust side space S1 (first flow path) and an air supply side space S2 (second flow path) through which air flows, a boundary wall part 43 separating the air exhaust side space S1 (first flow path) and the air supply side space S2 (second flow path) inside the case 41, a first attachment part 44 (first filter attachment part) to / from which an RA filter 44a (first filter) can be attached / detached in the air exhaust side space S1 (first flow path), and a second attachment part 45 and a third attachment part 46 (second filter attachment parts) to / from which an insect filter 45a and a dust filter 46a (second filters) can be attached / detached in the air supply side space S2 (second flow path).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technology of filter boxes and ventilation systems.

Background Art

[0002] Conventionally, in a building ventilation system, a technique of providing a filter box for installing a filter for collecting dust and the like has been known. For example, it is as described in Patent Document 1.

[0003] In the technique described in Patent Document 1, a filter box is provided between the living space of a building and a ventilation device main body having an air supply fan and an exhaust fan, and a dust removal filter is provided in the filter box. Thereby, it is possible to suppress the flow of dust from the living space to the ventilation device main body and also from the ventilation device main body to the living space. Further, inside the ventilation device main body, a non-woven fabric filter is provided at a portion communicating with an air intake provided on the outer wall of the building. Thereby, it is possible to suppress the flow of dust from the outdoor space to the ventilation device main body.

[0004] However, in the technique described in Patent Document 1, since various filters (dust removal filters and non-woven fabric filters) are provided at different locations, it is inconvenient from the viewpoint of maintainability.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] This invention was made in view of the above circumstances, and the problem it aims to solve is to provide a filter box and ventilation system that can improve maintainability. [Means for solving the problem]

[0007] The problems that this invention aims to solve are as described above, and the means for solving these problems will now be explained.

[0008] That is, claim 1 is a filter box used in a ventilation system, comprising a housing having a first circulation path and a second circulation path through which air can flow, and a space between the first circulation path and the second circulation path inside the housing , so that they cannot communicate with each other It comprises a partition wall section, a first filter mounting section from which a first filter can be attached and detached in the first flow path, and a second filter mounting section from which a second filter can be attached and detached in the second flow path. Furthermore, the housing is provided with an opening / closing section in the portion facing the first circulation path, which serves as an air inlet to the first circulation path and is formed to be openable and closable, and the partition wall is formed to be removable via the opening / closing section. It is.

[0011] Claim 2 In this case, the first part of the housing having the first distribution path and the second part having the second distribution path are formed such that the relative widths in one direction and the relative widths in the second direction perpendicular to the first direction are inverse to each other.

[0012] Claim 3 In this configuration, at least one of the first filter and the second filter has a plurality of filter surfaces that are inclined with respect to the direction of airflow.

[0013] Claim 4 In this case, a ventilation system comprising a filter box according to any one of claims 1 to 5, further comprising clogging detection means for detecting clogging of the first filter and the second filter.

[0014] Claim 5In this case, the ventilation system is a general ventilation system. In the first flow path, return air from the indoor space is introduced, and in the second flow path, outside air from the outdoor space is introduced.

Advantages of the Invention

[0015] As an effect of the present invention, the following effects are achieved.

[0016] In the present invention, maintainability can be improved.

Brief Description of the Drawings

[0017] [Figure 1] Schematic diagram showing the configuration of a general ventilation system including a filter box according to a first embodiment of the present invention. [Figure 2] Similarly, a block diagram. [Figure 3] [[ID=2,5]](a) Schematic plan sectional view of the filter box. (b) Similarly, schematic side sectional view. (c) Similarly, front view. [Figure 4] Graph showing an example of the relationship between the current value of the fan and the elapsed time since the filter was installed. [Figure 5] (a) Diagram showing an example of the heat transfer amount and the temperature rise of outside air from the outdoor space in the housing of the filter box. (b) Diagram showing an example of the heat transfer amount and the temperature rise of outside air from the outdoor space in the partition wall portion of the filter box. [Figure 6] (a) Schematic plan sectional view of the filter box according to a first alternative example. (b) Schematic plan sectional view of the filter box according to a second alternative example. [Figure 7] (a) Schematic plan sectional view of the filter box according to a second embodiment. (b) Similarly, front view. [Figure 8] (a) Schematic front sectional view of the filter box according to a third embodiment. (b) Similarly, bottom view. [Figure 9](a) Schematic diagram showing the configuration of a general ventilation system equipped with a filter box according to the third embodiment in the ceiling space of a building. (b) Similarly, a schematic diagram showing the configuration of a general ventilation system equipped in the wall of a building.

Mode for Carrying Out the Invention

[0018] Hereinafter, with reference to FIGS. 1 to 6, the general ventilation system 1 equipped with the filter box 40 according to the first embodiment of the present invention will be described. In the following, the vertical direction, the horizontal direction, and the front-rear direction are defined according to the arrows shown in the figures, respectively.

[0019] The general ventilation system 1 is for appropriately exhausting air from the interior of a building and supplying air to the interior. In this embodiment, the general ventilation system 1 is provided, for example, in a detached house (House H) as the building. The general ventilation system 1 includes an exhaust duct 10, a supply duct 20, a heat exchanger 30, a filter box 40, and a control unit 50.

[0020] The exhaust duct 10 is a path for air that takes in return air (RA) indoors and discharges it outdoors as exhaust air (EA). The upper end side of the exhaust duct 10 is arranged indoors, and most of the other parts are provided in the ceiling space of the house H. In this embodiment, the diameter of the exhaust duct 10 is formed to be 150 mm. A heat exchanger 30 is connected to the middle part of the exhaust duct 10 in the air flow direction. Hereinafter, the upstream side and the downstream side are defined respectively based on the air flow direction. Also, among the exhaust duct 10, the part upstream of the heat exchanger 30 is referred to as the "upstream exhaust duct 11", and the part downstream of the heat exchanger 30 is referred to as the "downstream exhaust duct 12".

[0021] The upstream exhaust duct 11 has its upstream end connected to the interior through the filter box 40 and its downstream end connected to the heat exchanger 30. Also, the downstream exhaust duct 12 has its upstream end connected to the heat exchanger 30 and its downstream end connected to the outdoors. The upstream exhaust duct 11 and the downstream exhaust duct 12 communicate with each other through a predetermined exhaust path inside the heat exchanger 30.

[0022] The supply air duct 20 is an air path for taking in outside air (OA) and introducing it into the building as supply air (SA). The supply air duct 20 is mostly installed in the ceiling space of the house H. In this embodiment, the diameter of the supply air duct 20 is formed to be 150 mm. A heat exchanger 30 is connected to the middle of the air flow direction of the supply air duct 20.

[0023] In the following description, the air supply duct 20 upstream of the heat exchanger 30 will be referred to as the "upstream air supply duct 21," and the air supply duct downstream of the heat exchanger 30 will be referred to as the "downstream air supply duct 22." The middle section of the air supply duct 21 is located inside the room and is connected to the filter box 40. In the following description, the air supply duct 21 upstream of the filter box 40 will be referred to as the "upstream first air supply duct 21a," and the air supply duct downstream of the filter box 40 will be referred to as the "upstream second air supply duct 21b." The downstream end of the upstream first air supply duct 21a and the upstream end of the upstream second air supply duct 21b are both located inside the room.

[0024] The upstream first air supply duct 21a has its upstream end connected to the outdoors and its downstream end connected to the filter box 40. The upstream second air supply duct 21b has its upstream end connected to the filter box 40 and its downstream end connected to the heat exchanger 30. The downstream air supply duct 22 has its upstream end connected to the heat exchanger 30 and its downstream end connected to the room. The upstream air supply duct 21 (upstream second air supply duct 21b) and the downstream air supply duct 22 are connected to each other via a predetermined air supply path inside the heat exchanger 30.

[0025] The heat exchanger 30 is installed in the ceiling space of the house H. Inside the heat exchanger 30, the exhaust path and the supply path are arranged to intersect with each other. In this way, the heat exchanger 30 can perform heat exchange between the return air from the upstream exhaust duct 11 and the outside air from the upstream first supply air duct 21a. The heat exchanger 30 also has a supply air fan 34 for supplying air and an exhaust fan 33 for exhausting air.

[0026] In this way, the heat exchanger 30 can discharge indoor return air as exhaust to the outdoors via the exhaust duct 10. The heat exchanger 30 can also introduce outdoor outside air as supply air into the room via the supply air duct 20. In this way, the heat exchanger 30 can perform ventilation while exchanging heat with the outside air, thereby saving energy and maintaining an appropriate indoor environment within the house H.

[0027] The filter box 40 houses various filters. The filter box 40 is installed, for example, on the wall of a corridor in a house H. The filter box 40 comprises a housing 41, a door 42, a partition wall 43, a first mounting section 44 (RA filter 44a), a second mounting section 45 (insect-proof filter 45a), a third mounting section 46 (dust removal filter 46a), a cylindrical section 47, and a pressure sensor 48. Note that the filter box 40 shown in Figure 1 is a schematic diagram, so the positional relationships and sizes of the components of the filter box 40 will be explained using Figure 3.

[0028] The housing 41 is formed in a roughly box shape with an open front. An air circulation path is formed inside the housing 41, and various filters are housed there. The housing 41 has a roughly cubic outer shell. The housing 41 is made of a foamed plastic with thermal insulation properties, such as extruded polystyrene. In this embodiment, the housing 41 is formed with a width of 500 mm from left to right, a height of 500 mm from top to bottom, and a front to back of 400 mm. The wall thickness of the housing 41 is formed to 10 mm based on the perspective of preventing condensation, which will be described later.

[0029] The door portion 42 is provided in the front opening of the housing 41 so as to be openable and closable. The door portion 42 is formed in a substantially plate shape with its plate surface oriented in the front-to-back direction. The door portion 42 is made of the same material as the housing 41. The door portion 42 has a plurality of slits 42a. Each of the plurality of slits 42a is formed to penetrate the door portion 42 in the front-to-back direction and to extend in the vertical direction. In this way, the inside and outside (room) of the housing 41 are connected via the door portion 42 (slits 42a). The door portion 42 serves as an air inlet to the exhaust side space S1, which will be described later. Note that the door portion 42 may not be openable and closable, but may be provided so as to be detachable from the housing 41.

[0030] The partition wall 43 is formed in a roughly plate-like shape with its surface facing the front-to-back direction. The partition wall 43 is made of the same material as the housing 41. The thickness of the partition wall 43 is set to 40 mm based on the perspective of preventing heat exchange, which will be described later. The partition wall 43 is detachably installed in the middle of the housing 41 in the front-to-back direction. As a result, when the partition wall 43 is installed inside the housing 41, it divides the interior into front-to-back sections so that they cannot communicate with each other. In the following, the space inside the housing 41 divided by the partition wall 43 will be referred to as the "exhaust side space S1" on the front side (door side 42 side) and the space on the rear side (opposite door side 42 side) will be referred to as the "supply side space S2". The partition wall 43 may not be detachable and may be installed in the housing 41 in an openable and closable manner.

[0031] The first mounting portion 44 is a portion for attaching the RA filter 44a, which will be described later. The first mounting portion 44 is provided adjacent to the door portion 42 in the exhaust side space S1. The first mounting portion 44 is configured to allow the RA filter 44a to be attached and detached.

[0032] The RA filter 44a is a relatively coarse pre-filter. When attached to the first mounting portion 44, the RA filter 44a is provided in the exhaust-side space S1 of the housing 41, close to the door portion 42. The RA filter 44a is positioned so that its filter surface faces the multiple slits 42a of the door portion 42 by orienting it in the front-to-back direction. In this way, when indoor return air flows through the door portion 42 into the exhaust-side space S1 of the housing 41, the RA filter 44a can capture coarse dust contained in the return air.

[0033] The second mounting section 45 is a part for attaching the insect-proof filter 45a, which will be described later. The second mounting section 45 is provided in the middle of the air supply space S2 in the left-right direction. The second mounting section 45 is configured to allow the insect-proof filter 45a to be attached and detached.

[0034] The insect-proof filter 45a is a filter that suppresses the entry of insects. The insect-proof filter 45a is formed, for example, in the shape of a wire mesh. When the insect-proof filter 45a is attached to the second mounting part 45, it is provided in the middle of the left-right direction of the air supply side space S2 of the housing 41, with the filter surface facing left-right.

[0035] The third mounting portion 46 is for attaching the dust filter 46a, which will be described later. The second mounting portion 45 is located midway in the left-right direction of the air supply space S2 and is provided to the right of the second mounting portion 45. The second mounting portion 45 is configured to allow the dust filter 46a to be attached and detached.

[0036] The dust removal filter 46a is a relatively fine-mesh, high-performance filter. When attached to the third mounting portion 46, the dust removal filter 46a is installed adjacent to the insect-proof filter 45a in the middle of the left-right direction of the air supply side space S2 of the housing 41 (to the right of the insect-proof filter 45a). The dust removal filter 46a is installed with its filter surface facing left-right.

[0037] In this way, the insect-proof filter 45a and the dust-removing filter 46a divide the supply air space S2 of the housing 41 into left and right sections so that they can communicate with each other. As will be described later, outside air flows from the left to the right in the supply air space S2 which is divided into left and right sections. Hereafter, the left section of the divided supply air space S2 of the housing 41 will be referred to as the "upstream supply air space S2a," and the right section will be referred to as the "downstream supply air space S2b." When outside air flows from the upstream supply air space S2a to the downstream supply air space S2b of the housing 41 via the insect-proof filter 45a and the dust-removing filter 46a (see Figure 1), the insect-proof filter 45a can capture insects, and the dust-removing filter 46a can capture fine dust contained in the outside air.

[0038] The cylindrical portion 47 is the part that connects the housing 41 to various ducts. The cylindrical portion 47 is formed to protrude upward from an opening (not shown) in the top plate of the housing 41. In this embodiment, the diameter of the cylindrical portion 47 is formed to a size that allows connection of an exhaust duct 10 and an air supply duct 20 having a diameter of 150 mm. The diameter of the cylindrical portion 47 can be changed as appropriate, for example, to a size that allows connection of a duct having a diameter of 100 mm.

[0039] Multiple cylindrical sections 47 are provided (three in this embodiment). Specifically, the three cylindrical sections 47 include an exhaust-side cylindrical section 61 provided on the top plate of the exhaust-side space S1, an air-supply upstream cylindrical section 62 provided on the top plate of the air-supply upstream space S2a, and an air-supply downstream cylindrical section 63 provided on the top plate of the air-supply downstream space S2b.

[0040] As shown in Figure 1, the upstream end of the upstream exhaust duct 11 is connected to the exhaust-side cylindrical section 61. In this way, the return air from the room flows into the exhaust-side space S1 via the door section 42, and then flows through the exhaust-side cylindrical section 61 to the upstream exhaust duct 11.

[0041] Furthermore, the downstream end of the upstream first air supply duct 21a is connected to the upstream cylindrical section 62. In this way, outside air that has flowed through the upstream first air supply duct 21a flows into the upstream air supply space S2a via the upstream cylindrical section 62. The outside air that has flowed into the upstream air supply space S2a then flows from the upstream air supply space S2a to the downstream air supply space S2b via the insect-proof filter 45a and the dust-removing filter 46a.

[0042] Furthermore, the upstream end of the upstream second air supply duct 21b is connected to the downstream cylindrical section 63 of the air supply. In this way, outside air flowing from the upstream air supply space S2a into the downstream air supply space S2b flows into the upstream second air supply duct 21b via the downstream cylindrical section 63 of the air supply.

[0043] The pressure sensor 48 detects the pressure inside the cylindrical section 47. The pressure sensor 48 is provided in each of the three cylindrical sections 47 (exhaust side cylindrical section 61, supply air upstream side cylindrical section 62, and supply air downstream side cylindrical section 63). Thus, the pressure sensor 48 provided in the exhaust side cylindrical section 61 can detect the pressure of the return air from the room after it has flowed from the room to the exhaust side space S1 via the RA filter 44a. The pressure sensor 48 provided in the supply air upstream side cylindrical section 62 can detect the pressure of the outside air from the outdoors. The pressure sensor 48 provided in the supply air downstream side cylindrical section 63 can detect the pressure of the outside air after it has flowed from the supply air upstream side space S2a to the supply air downstream side space S2b via the insect-proof filter 45a and the dust-removing filter 46a.

[0044] The pressure sensor 48 may be provided in the duct (upstream exhaust duct 11, upstream first supply air duct 21a, upstream second supply air duct 21b) rather than in the cylindrical portion 47 (i.e., the filter box 40). In the following, the pressure sensors 48 provided in the exhaust side cylindrical portion 61, the supply air upstream side cylindrical portion 62, and the supply air downstream side cylindrical portion 63 may be referred to as the "exhaust side pressure sensor 71," the "supply air upstream side pressure sensor 72," and the "supply air downstream side pressure sensor 73," respectively.

[0045] In the filter box 40 configured as described above, all (3) filters used in the general ventilation system 1 are housed in the housing 41. If the RA filter 44a becomes clogged, the door 42 can be opened to clean or replace the RA filter 44a. If the insect-proof filter 45a or dust-removing filter 46a (hereinafter sometimes simply referred to as "dust-removing filter 46a, etc.") becomes clogged, the door 42 can be opened, the RA filter 44a can be temporarily removed, and the partition wall 43 can be opened to clean or replace the dust-removing filter 46a, etc.

[0046] Thus, in the filter box 40, all filter maintenance can be performed in one location (in this embodiment, the corridor wall), and furthermore, it can be done from the front of the filter box 40, thus improving maintainability.

[0047] In this embodiment, the timing for cleaning or replacing various filters (whether or not they are clogged) is notified to the residents of the house H by the processing of the control unit 50 (hereinafter referred to as "clogging detection processing"), which will be described later.

[0048] The control unit 50 shown in Figure 2 includes a storage unit such as RAM, ROM, and HDD, and an arithmetic processing unit such as a CPU. Various types of information and programs are stored in the storage unit of the control unit 50. The programs include a program for executing clogging detection processing. The control unit 50 also has an operation unit (e.g., buttons and a keyboard) that allows for various operations, and a display unit 51 (e.g., a lamp and a monitor) that can display various types of information.

[0049] The control unit 50 is also connected to pressure sensors 48 (exhaust-side pressure sensor 71, supply-upstream-side pressure sensor 72, and supply-downstream-side pressure sensor 73) and is configured to receive signals from the pressure sensors 48. In this way, the control unit 50 can acquire the detection results of the pressure sensors 48. The control unit 50 performs clogging detection processing based on the detection results of the pressure sensors 48. Specifically, the control unit 50 detects clogging of the RA filter 44a and dust removal filter 46a, etc., based on the differential pressure between predetermined locations through clogging detection processing. The contents of the clogging detection processing will be described in detail below.

[0050] The control unit 50 compares the pressure in the path from the outdoors (external hood) to the dust removal filter 46a, etc., with the pressure in the path from the RA filter 44a to the heat exchanger 30 in order to detect clogging of the RA filter 44a. Specifically, the control unit 50 compares the current differential pressure and the initial differential pressure of the two paths (referred to as the "first path" for convenience) based on the detection results of the supply air upstream pressure sensor 72 and the exhaust air pressure sensor 71. Here, the initial differential pressure refers to the differential pressure in the first path when an unused RA filter 44a is installed in the filter box 40.

[0051] Here, as the RA filter 44a becomes clogged, the differential pressure between the path from the outdoors (external hood) to the dust removal filter 46a, etc., and the path from the RA filter 44a to the heat exchanger 30 gradually increases. Therefore, when the current differential pressure in the first path exceeds a predetermined threshold (for example, 150%) relative to the initial differential pressure, the control unit 50 displays a message on the display unit 51 recommending cleaning. Furthermore, when the current differential pressure in the first path exceeds a predetermined threshold (for example, 200%) relative to the initial differential pressure, the control unit 50 displays a message on the display unit 51 recommending replacement because cleaning is not sufficient to restore functionality.

[0052] Furthermore, in order to detect clogging of the dust filter 46a, etc., the control unit 50 compares the pressure in the path from the outdoors (external hood) to the dust filter 46a, etc. with the pressure in the path from the dust filter 46a, etc. to the heat exchanger 30. That is, based on the detection results of the air supply upstream pressure sensor 72 and the air supply downstream pressure sensor 73, the control unit 50 compares the current differential pressure and the initial differential pressure of the two paths (referred to as the "second path" for convenience).

[0053] Then, similar to the case of the RA filter 44a, the control unit 50, when the current differential pressure in the second path exceeds a predetermined threshold (for example, 150%) relative to the initial differential pressure, displays a message on the display unit 51 prompting cleaning, indicating that cleaning is recommended. Furthermore, if the current differential pressure in the second path exceeds a predetermined threshold (for example, 200%) relative to the initial differential pressure, the control unit 50 displays a message on the display unit 51 prompting replacement, indicating that cleaning is not sufficient and replacement is recommended.

[0054] In this way, the clogging detection process performed by the control unit 50 makes it possible to identify which of the multiple filters is clogged. This means that cleaning or replacing the specific filter can be done at the appropriate time, thereby improving maintainability.

[0055] The clogging detection process performed by the control unit 50 is not limited to the process using the pressure sensor 48 as described above. Specifically, the control unit 50 can also perform clogging detection by acquiring the current values ​​of the supply fan 34 and exhaust fan 33 of the heat exchanger 30. The method by which the control unit 50 acquires the current values ​​of the supply fan 34 and exhaust fan 33 is not particularly limited.

[0056] Here, Figure 4 is a graph showing an example of the relationship between the current value of each fan (supply fan 34 or exhaust fan 33) and the elapsed time since the installation of the various filters. According to Figure 4, it can be seen that the current value increases as the elapsed time since the installation of the various filters increases (i.e., as the pressure loss increases due to the progression of clogging). In other words, as clogging of the RA filter 44a progresses, the current value of the exhaust fan 33 increases. Also, as clogging of the dust removal filter 46a, etc. progresses, the current value of the supply fan 34 increases. Note that in Figure 4, when the current value temporarily decreases (for example, in June), it indicates that the pressure loss temporarily decreased due to cleaning, and the current value also decreased.

[0057] Thus, when the current value of the intake fan 34 or exhaust fan 33 exceeds a predetermined threshold relative to its initial value, the control unit 50 displays a message on the display unit 51 recommending cleaning. Furthermore, when the current value of the intake fan 34 or exhaust fan 33 exceeds a predetermined threshold relative to its initial value (for example, twice the initial value), the control unit 50 displays a message on the display unit 51 recommending replacement, stating that cleaning is not sufficient to restore the condition and replacement is recommended. This allows for cleaning and replacement of various filters at the appropriate time, thereby improving maintainability.

[0058] As described above, the control unit 50 can perform clogging detection processing based on the detection results of the pressure sensor 48, as well as other detection processing. For example, if the control unit 50 determines, based on the detection results of the pressure sensor 48, that the current differential pressure between the upstream and downstream paths of various filters is less than or equal to a predetermined threshold (e.g., 10%) of the initial differential pressure, it can determine that the supply fan 34 or exhaust fan 33 is stopped.

[0059] As described above, the filter box 40 is configured so that outside air from the outdoors and return air from the indoors circulate within the housing 41 through adjacent spaces (exhaust-side space S1 and supply-side space S2) separated by a partition wall 43. In such a configuration, the outside air from the outdoors and the return air from the indoors may exchange heat with each other through the partition wall 43. Thus, for example in winter, if the temperature of the return air from the indoors decreases in accordance with the temperature of the outside air, the heat exchange efficiency of the heat exchange device 30 decreases, which is undesirable. Also, if the temperature of the housing 41 itself decreases in accordance with the temperature of the outside air, condensation is more likely to occur, which is undesirable.

[0060] Therefore, in the filter box 40 according to this embodiment, the thermal insulation performance of the housing 41 and the partition wall 43 is set based on two perspectives: condensation prevention and heat exchange prevention. Specifically, in this embodiment, based on environmental conditions that refer to the lowest outside temperature in Hokkaido, a cold region, the thermal resistance value, which is the thermal insulation performance of the housing 41, is set to 0.38 m 2 The setting is above K / W, and the thermal resistance value, which is the thermal insulation performance of the partition wall section 43, is 1.00 m 2 It is set to kW or higher.

[0061] The thermal insulation performance of the enclosure 41 helps to suppress the occurrence of condensation. Furthermore, the thermal insulation performance of the partition wall 43 keeps the temperature rise of the outside air from the outside to less than 0.1 degrees Celsius and suppresses the temperature drop of the return air from the inside, thereby preventing a decrease in the heat exchange efficiency of the heat exchange device 30.

[0062] Here, Figure 5(a) shows that the thermal resistance value of the housing 41 is 0.38 m 2 When set to K / W, Figure 5(b) shows that the thermal resistance value of the partition wall 43 is 1.00 m 2 This figure shows an example of heat transfer and the temperature rise of the outside air when the setting is kW. The assumed environmental conditions are an outside air temperature of -13.4 degrees Celsius and a relative humidity of 80%, while the indoor temperature is 20 degrees Celsius, the relative humidity is 60%, and the dew point temperature is 12 degrees Celsius.

[0063] In such a case, in the enclosure 41 having the thermal insulation performance described above, the heat transfer is 17.78 W, and the temperature of the outside air (supply air before it passes through the heat exchanger 30) flowing from the enclosure 41 to the heat exchanger 30 is -13.21 degrees (i.e., the temperature rise is 0.19 degrees).

[0064] Furthermore, in the partition wall section 43 having the aforementioned thermal insulation performance, the heat transfer rate is 6.68 W, and the temperature of the outside air (supply air before it passes through the heat exchanger 30) flowing from the enclosure 41 to the heat exchanger 30 is -13.33 degrees Celsius (i.e., the temperature rise is 0.07 degrees Celsius). In this way, the temperature rise of the supply air before it passes through the heat exchanger 30 can be kept to less than 0.1 degrees Celsius.

[0065] In the filter box 40 according to the first embodiment, the configuration of the dust removal filter 46a can be appropriately changed, as shown in Figure 6. Specifically, as shown in Figure 6(a), the dust removal filter 46a can be formed in a roughly V-shape in plan view. Also, as shown in Figure 6(b), the dust removal filter 46a can be formed in a zigzag shape in plan view. Thus, the dust removal filter 46a has multiple filter surfaces that are inclined in plan view with respect to the direction of airflow (left-right direction in Figure 6).

[0066] This configuration increases the surface area of ​​the dust filter 46a, thereby reducing the pressure loss of outside air passing through the dust filter 46a. Furthermore, since the dust filters 46a shown in Figures 6(a) and (b) are integrally molded, they can be easily pulled out to the front of the filter box 40, improving maintenance.

[0067] Furthermore, this same configuration can be used not only for the dust removal filter 46a, but also for other filters (RA filter 44a and insect-proof filter 45a).

[0068] In the following section, the configuration of the filter box 40 according to the second embodiment of the present invention will be described with reference to Figure 7.

[0069] The main difference between the filter box 40 according to the second embodiment and the first embodiment is that the area of ​​the partition wall (second partition wall 143) (specifically, the area in contact with the exhaust side space (exhaust side space S1) and the supply side space (supply side space S2), hereinafter referred to as the "thermal insulation area") is reduced by changing the configuration of the housing (second housing 141).

[0070] Specifically, in the filter box 40 according to the second embodiment, the second housing 141 has different vertical and horizontal widths in its left and right portions. Hereinafter, the left portion of the second housing 141, which has a smaller vertical width and a larger horizontal width, may be referred to as the "left housing portion 144," and the right portion, which has a larger vertical width and a smaller horizontal width, may be referred to as the "right housing portion 145."

[0071] In the second enclosure 141, the front-to-back width of the left enclosure 144 and the right enclosure 145 are formed to be 200 mm. The left enclosure 144 has a left-to-right width of 500 mm and a top-to-bottom width of 500 mm. The right enclosure 145 has a left-to-right width of 300 mm and a top-to-bottom width of 800 mm. Thus, in the left enclosure 144 and the right enclosure 145, the relative sizes of the top-to-bottom width and the left-to-bottom width are inversely related.

[0072] According to this, the heat transfer area of ​​the second boundary wall 143, which is provided at the boundary between the left part 144 and the right part 145 of the second housing 141, is 100,000 mm (calculated by a vertical width of 500 mm x a front-to-back width of 200 mm). 2 It is formed as follows. Here, the heating area of ​​the partition wall portion 43 according to the first embodiment is 250,000 mm (calculated by the vertical width of 500 mm × the front-to-back width of 500 mm). 2It is formed in such a way that the heating area of ​​the second boundary wall portion 143 is reduced by 40% from the heating area of ​​the boundary wall portion 43 according to the first embodiment. In this case, along with the reduction in heating area, the thickness of the second boundary wall portion 143 can be reduced from the thickness of the boundary wall portion 43 according to the first embodiment (40 mm) to 20 mm.

[0073] Thus, since the second boundary wall 143 is formed with a smaller heating surface area than the boundary wall 43 according to the first embodiment, heat exchange between the outside air from the outdoors and the return air from the indoors via the second boundary wall 143 can be effectively suppressed. Furthermore, since the second boundary wall 143 can be made thinner, costs can be reduced.

[0074] Furthermore, in the second housing 141, by increasing the vertical width of the right portion 145 of the housing, the volume of the exhaust-side space S1 is formed to be the same as the volume of the exhaust-side space S1 of the housing 41 according to the first embodiment. Here, if the volume of the exhaust-side space S1 of the right portion 145 of the housing were formed to be smaller than the volume of the exhaust-side space S1 according to the first embodiment (i.e., if the vertical width of the right portion 145 of the housing were not large (for example, 500 mm)), the airflow through the exhaust-side space S1 would become faster, creating an environment where outside air from outdoors and return air from indoors could easily exchange heat with each other via the second barrier wall 143. In contrast, the right portion 145 of the housing suppresses the speed of the airflow through the exhaust-side space S1, and consequently suppresses the creation of an environment where outside air from outdoors and return air from indoors could easily exchange heat with each other via the second barrier wall 143.

[0075] Thus, in the filter box 40 according to the second embodiment, compared to the first embodiment, the heating surface area of ​​the second barrier wall 143 is made smaller without reducing the volume of the exhaust side space S1. Therefore, it is possible to effectively suppress heat exchange between the outside air from outdoors and the return air from indoors via the second barrier wall 143.

[0076] In the following section, the configuration of the filter box 40 according to the third embodiment of the present invention will be described with reference to Figures 8 and 9.

[0077] The main difference between the filter box 40 of the third embodiment and the first embodiment is that, by changing the configuration of the housing (third housing 241), it is made so that it can be installed either above the ceiling or inside a wall.

[0078] Specifically, in the filter box 40 according to the third embodiment, a door portion 42 is provided on the lower surface of the third housing 241. Also, unlike the first embodiment, the exhaust-side space S1 and the supply-side space S2 are partitioned vertically. Furthermore, the supply-side space S2 is provided with two cylindrical portions (hereinafter referred to as the "first supply-side cylindrical portion 242" and the "second supply-side cylindrical portion 243"). The first supply-side cylindrical portion 242 and the second supply-side cylindrical portion 243 are configured to be switchable between communicating with the supply-side space S2. The first supply-side cylindrical portion 242 is provided on the side surface of the third housing 241. The second supply-side cylindrical portion 243 is provided on the top plate of the third housing 241 (the portion facing the partition wall portion 43).

[0079] Thus, as shown in Figure 9(a), when the filter box 40 according to the third embodiment is installed in the ceiling space, of the supply-side first cylindrical portion 242 and the supply-side second cylindrical portion 243, the supply-side first cylindrical portion 242 is in communication with the supply-side space S2, while the supply-side second cylindrical portion 243 is not in communication with the supply-side space S2. In this way, the supply-side first cylindrical portion 242 is connected to the upstream first supply-side duct 21a, and outside air from outdoors flows into the supply-side space S2 via the upstream first supply-side duct 21a.

[0080] Furthermore, as shown in Figure 9(b), when the filter box 40 according to the third embodiment is installed inside a wall, the filter box 40 is installed lying horizontally from the state shown in Figure 8. In this case, of the supply-side first cylindrical part 242 and the supply-side second cylindrical part 243, the supply-side first cylindrical part 242 is not in communication with the supply-side space S2, while the supply-side second cylindrical part 243 is in communication with the supply-side space S2. Thus, the supply-side second cylindrical part 243 is connected to the upstream first supply-side duct 21a, and outside air from outdoors flows into the supply-side space S2 via the upstream first supply-side duct 21a.

[0081] As described above, in this embodiment, A filter box 40 used in a general ventilation system 1, A housing 41 having an exhaust-side space S1 (first circulation path) and an intake-side space S2 (second circulation path) through which air can circulate, A partition wall portion 43 is provided inside the housing 41 to separate the exhaust side space S1 (first circulation path) and the supply side space S2 (second circulation path), In the exhaust side space S1 (first flow path), there is a first mounting portion 44 (first filter mounting portion) from which the RA filter 44a (first filter) can be attached and detached, In the aforementioned air supply space S2 (second airflow path), there are a second mounting section 45 and a third mounting section 46 (second filter mounting section) from which the insect-proof filter 45a and the dust-removing filter 46a (second filter) can be attached and detached, It is equipped with the following features.

[0082] This configuration allows all the various filters (in this embodiment, all of them) used in the general ventilation system 1 to be concentrated in one place, thereby improving maintainability.

[0083] Furthermore, in this embodiment, The housing 41 is provided with a door portion 42 (opening / closing portion) in the portion facing the exhaust side space S1 (first circulation path), which serves as an air inlet to the exhaust side space S1 (first circulation path) and is formed to be openable and closable.

[0084] This configuration allows for improved maintenance of the exhaust-side space S1 via the door 42.

[0085] Furthermore, in this embodiment, The partition wall portion 43 is formed to be removable via the door portion 42 (opening / closing portion).

[0086] This configuration allows for improved maintenance of the air supply space S2 via the door 42.

[0087] Furthermore, in this (second) embodiment, Of the housing 41, the right portion 145 (first part) of the housing having the exhaust side space S1 (first flow path) and the left portion 144 (second part) of the housing having the supply side space S2 (second flow path) are, It is formed such that the relative sizes of the width in the vertical direction (one direction) and the relative sizes of the width in the horizontal direction (a second direction perpendicular to the aforementioned one direction) are inversely related.

[0088] With this configuration, the heating surface area of ​​the second barrier wall 143 is reduced without reducing the volume of the exhaust space S1, thus effectively suppressing heat exchange between the outside air from outdoors and the return air from indoors via the second barrier wall 143.

[0089] Furthermore, in this embodiment, The dust removal filter 46a (at least one of the first filter and the second filter) has a plurality of filter surfaces that are inclined with respect to the direction of airflow.

[0090] This configuration makes it possible to reduce the pressure loss of the air passing through the filter.

[0091] Furthermore, in this embodiment, A general ventilation system 1 comprising a filter box 40 according to any one of claims 1 to 5, The system includes a clogging control unit 50 (detection means) for detecting clogging of the RA filter 44a (first filter), the insect-proof filter 45a, and the dust-removing filter 46a (second filter).

[0092] This configuration improves maintainability.

[0093] Furthermore, in this embodiment, The ventilation system is a general ventilation system 1, In the exhaust side space S1 (first circulation path), return air from indoors is introduced. Outside air is introduced into the aforementioned supply air space S2 (second circulation path).

[0094] This configuration improves maintainability in the general ventilation system 1.

[0095] Although embodiments of the present invention have been described above, the present invention is not limited to the above configurations, and various modifications are possible within the scope of the invention as described in the claims.

[0096] For example, the building is not limited to residential buildings; it could also be an apartment building, office building, commercial facility, school, etc.

[0097] Furthermore, the ventilation system using the filter box 40 is not limited to general ventilation systems, but can be used in various ventilation systems.

[0098] Furthermore, the numerical values ​​used in the description of this embodiment (such as the size of the filter box 40 and the threshold value) are merely examples and can be changed depending on the application of the present invention.

[0099] Furthermore, the types and number of filters housed in the filter box 40 are not limited to those in this embodiment and can be changed depending on the application of the present invention.

[0100] Furthermore, the display unit 51 is not necessarily provided by the control unit 50, but may be, for example, a portable terminal owned by a resident of house H. [Explanation of symbols]

[0101] 1. General ventilation system 40 filter boxes 41 cabinets 43. Boundary wall section 44 First mounting section 44a RA filter 45 Second mounting section 45a Insect-proof filter 46 Third mounting section 46a Dust filter H Housing

Claims

1. A filter box used in a ventilation system, A housing having a first circulation path and a second circulation path through which air can circulate, A partition wall portion is provided within the housing that separates the first circulation path and the second circulation path so that they cannot communicate with each other. In the aforementioned first distribution route, there is a first filter mounting section from which the first filter can be attached and detached, The second distribution route includes a second filter mounting section from which the second filter can be attached and detached, It is equipped with, The housing is provided with an opening / closing section in the portion facing the first circulation path, which serves as an air inlet to the first circulation path and is formed to be openable and closable. The boundary wall portion is formed to be removable via the opening and closing portion. Filter box.

2. The housing comprises a first portion having the first distribution path and a second portion having the second distribution path, The relationship between the magnitudes of the widths in one direction and the relationship between the magnitudes of the widths in a second direction perpendicular to the aforementioned one direction are formed to be inverse of each other. The filter box according to claim 1.

3. At least one of the first filter and the second filter has a plurality of filter surfaces inclined with respect to the direction of airflow, The filter box according to claim 1 or claim 2.

4. A ventilation system comprising a filter box according to any one of claims 1 to 3, The system includes clogging detection means for detecting clogging of the first filter and the second filter. Ventilation system.

5. The ventilation system is a general ventilation system, The first distribution channel mentioned above introduces return air from indoors. In the aforementioned second distribution channel, outside air is introduced from the outdoors. The ventilation system according to claim 4.

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