Ventilation device

Abstract

To provide a ventilating device that can relieve negative pressure in a building.SOLUTION: A ventilating device 50 comprises: an air exhaust passage 10 for transporting air sucked from indoors through an indoor side air exhaust port 18 by an air exhaust blower 14, to outdoors through an outdoor side air exhaust port 20; an air supply passage 12 for transporting air sucked from outdoors through an outdoor side air supply port 22 by an air supply blower 16, to indoors through an indoor side air supply port 24; a heat exchange element 26 for exchanging heat between the air passing through the air exhaust passage 10 and the air passing through the air supply passage 12; an air exhaust passage opening / closing part 28 for opening / closing the air exhaust passage 10; an air flow sensor 34 for detecting information related to the air passing through the air exhaust passage 10 and the air passing through the air supply passage 12; and a control part 36 for controlling the air exhaust passage opening / closing part 28 on the basis of a detection result of the air flow sensor 34.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a ventilation device.

Background Art

[0002] There is known a ventilation device installed in a building that introduces outside air from an outside air supply port and supplies it into the room through a built-in heat exchange element. For example, Patent Document 1 describes a heat exchange type ventilation device that exchanges heat between outside air and indoor air. This ventilation device includes a supply fan, an exhaust fan, a supply air blowing path for blowing air from the outside to the inside of the room, an exhaust air blowing path for blowing air from the inside of the room to the outside, and a heat exchange element. The heat exchange element is provided at a position where the supply air blowing path and the exhaust air blowing path intersect, and exchanges heat when ventilating the indoor air and the outdoor air.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The ventilation device may be controlled so that the air volume of the air exhausted (suctioned) from the room and the air volume of the air supplied to the room become predetermined values. However, due to air leakage from the gaps in the air blowing path inside the device, a difference may occur between the amount of air sucked from the room and the amount of air discharged to the outside, and a difference may occur between the amount of air sucked from the outside and the amount of air supplied to the room. In this case, even if the air volume of the air exhausted (suctioned) from the room and the air volume of the air supplied to the room are controlled to be equal, the amount of air discharged to the outside (exhaust air volume) may exceed the amount of air sucked from the outside (supply air volume). When the exhaust air volume exceeds the supply air volume, the inside of the building becomes negative pressure with respect to the outside air.

[0005] The ventilation device described in Patent Document 1 does not provide sufficient countermeasures from the viewpoint of alleviating the negative pressure inside the building caused by the difference in air volume.

[0006] Therefore, the present invention solves the above-mentioned conventional problems, and an object thereof is to provide a ventilation device capable of alleviating the negative pressure inside a building.

Means for Solving the Problems

[0007] And, in order to achieve this object, the ventilation device according to the present invention includes an exhaust air duct for transporting air sucked from indoors through an indoor exhaust port to the outdoors through an outdoor exhaust port by an exhaust blower, and an air supply duct for transporting air sucked from the outdoors through an outdoor air supply port to the indoors through an indoor air supply port by an air supply blower, a heat exchange element for exchanging heat between the air passing through the exhaust air duct and the air passing through the air supply duct, an exhaust air duct opening / closing part for opening and closing the exhaust air duct, an air flow sensor for detecting information regarding the air passing through the exhaust air duct and the air passing through the air supply duct, and a control part for controlling the exhaust air duct opening / closing part based on the detection result of the air flow sensor. The airflow sensor includes a differential pressure sensor that detects the pressure difference between the pressure of the air sucked in from the indoor through the indoor exhaust port and the pressure of the air sucked in from the outdoor through the outdoor air supply port. The control unit controls the exhaust air passage opening / closing unit based on the detection result of the differential pressure sensor so that the air supply volume is equal to or greater than the exhaust air volume.

[0008] Note that what is obtained by converting the expressions of the present disclosure among a method, an apparatus, a system, a recording medium, a computer program, etc. is also effective as an aspect of the present disclosure.

Effects of the Invention

[0009] According to the present invention, a ventilation device capable of alleviating the negative pressure inside a building can be provided.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments for carrying out the present disclosure will be described with reference to the accompanying drawings. In the present embodiment, the same or equivalent components and members are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. Further, some of the members that are not important for explaining the embodiment in each drawing are omitted from the display. In addition, terms including ordinal numbers such as first and second are used to describe various components, but this term is used only for the purpose of distinguishing one component from another component, and the components are not limited by this term.

[0012] (Ventilation device 50) The configuration of the ventilation device 50 according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view schematically showing the configuration of the ventilation device 50. FIG. 2 is a functional block diagram schematically showing the configuration of the control unit 36 among the configurations of the ventilation device 50.

[0013] The ventilation device 50 is installed on the ceiling surface of a building or the like, and has a ventilation function including an exhaust function of transporting indoor air outdoors and a supply function of transporting outdoor air indoors. Further, the ventilation device 50 functions as a heat exchange ventilation device that exchanges heat between the air transported from indoors to outdoors (exhaust air flow) and the air transported from outdoors to indoors (supply air flow).

[0014] The ventilation device 50 includes an exhaust air duct 10, a supply air duct 12, an exhaust blower 14, a supply blower 16, an indoor exhaust port 18, an outdoor exhaust port 20, an outdoor supply port 22, an indoor supply port 24, a heat exchange element 26, an exhaust air duct opening / closing part 28, an air flow sensor 34, and a control part 36.

[0015] The exhaust air duct 10 is an air conveyance path for conveying indoor air to the outside.

[0016] The supply air duct 12 is an air conveyance path for conveying outdoor air to the inside.

[0017] The exhaust blower 14 generates an air flow (exhaust flow) in the exhaust air duct 10. The exhaust blower 14 has an exhaust fan (not shown) and an exhaust motor. The exhaust fan is a centrifugal impeller such as a sirocco fan. The exhaust motor pivotally supports the exhaust fan rotatably. The exhaust motor is an alternating current motor (AC motor) or a direct current motor (DC motor).

[0018] The supply blower 16 generates an air flow (supply flow) in the supply air duct 12. The supply blower 16 has a supply fan (not shown) and a supply motor. The supply fan is a centrifugal impeller such as a sirocco fan. The supply motor pivotally supports the supply fan rotatably. The supply motor is an alternating current motor (AC motor) or a direct current motor (DC motor).

[0019] The indoor exhaust port 18 is a suction port for sucking indoor air into the ventilation device 50. The indoor exhaust port 18 communicates with the inside through connection with a duct (not shown). The indoor exhaust port 18 forms a part of the exhaust air duct 10.

[0020] The outdoor exhaust port 20 is an outlet for blowing out the air sucked from the indoor exhaust port 18 to the ventilation device 50 to the outside. The outdoor exhaust port 20 communicates with the outside by connecting to a duct (not shown). The outdoor exhaust port 20 constitutes a part of the exhaust air duct 10.

[0021] The outdoor air supply port 22 is an inlet for sucking the outside air into the ventilation device 50. The outdoor air supply port 22 communicates with the outside by connecting to a duct (not shown). The outdoor air supply port 22 constitutes a part of the air supply duct 12.

[0022] The indoor air supply port 24 is an outlet for blowing out the air sucked from the outdoor air supply port 22 to the ventilation device 50 into the room. The indoor air supply port 24 communicates with the inside by connecting to a duct (not shown). The indoor air supply port 24 constitutes a part of the air supply duct 12.

[0023] The heat exchange element 26 exchanges thermal energy (sensible heat or total heat) between the exhaust flow and the supply air flow. The heat exchange element 26 constitutes a part of the exhaust air duct 10 and the air supply duct 12.

[0024] The exhaust air duct opening / closing part 28 can adjust the opening ratio (the ratio of the flow rate through which the exhaust air can pass) of the exhaust air duct 10 by opening and closing the exhaust air duct 10. The exhaust air duct opening / closing part 28 is provided on the upstream side of the heat exchange element 26 in the exhaust air duct 10. The exhaust air duct opening / closing part 28 has a damper 30 and an actuator 32.

[0025] The damper 30 is a partition plate for opening and closing the exhaust air duct 10.

[0026] The actuator 32 is connected to one end of the damper 30 and rotates the damper 30.

[0027] The actuator 32 is a driving device that rotates the damper 30 by an electric swivel drive (such as a motor). The drive of the actuator 32 may be not limited to swiveling, but may also be telescopic, bending, etc. Further, the operating principle of the actuator 32 is not limited to electric type, but may also be hydraulic type, pneumatic type, chemical type, magnetic fluid, electro-viscous fluid.

[0028] That is, the exhaust air passage opening / closing part 28 enables the opening and closing of the exhaust air passage 10 by the rotation of the damper 30 following the movement of the actuator 32.

[0029] The air flow sensor 34 includes a differential pressure sensor 35.

[0030] The differential pressure sensor 35 detects the differential pressure (P1 - P2, or P2 - P1) between a first pressure P1 which is the pressure of the air sucked in from the indoor side through the indoor exhaust port 18, and a second pressure P2 which is the pressure of the air sucked in from the outdoor side through the outdoor air supply port 22. The air sucked in from the indoor side through the indoor exhaust port 18 is the air on the upstream side of the heat exchange element 26 in the exhaust air passage 10. The air sucked in from the outdoor side through the outdoor air supply port 22 is the air on the upstream side of the heat exchange element 26 in the air supply passage 12.

[0031] The control unit 36 is electrically communicably connected to the exhaust blower 14, the air supply blower 16, the actuator 32, and the differential pressure sensor 35, and comprehensively controls the ventilation device 50.

[0032] Each functional block shown in FIG. 2 can be realized by elements and mechanical devices including a computer's CPU (Central Processing Unit) in terms of hardware, and can be realized by a computer program or the like in terms of software. Here, however, the functional blocks realized by their cooperation are depicted. Therefore, it is understood by those skilled in the art who have read this specification that these functional blocks can be realized in various forms by a combination of hardware and software.

[0033] In the embodiment, the control unit 36 is arranged on the side surface of the main body of the ventilation device 50, but it is not limited thereto. For example, it may be provided in a terminal (remote controller) for remotely operating a ventilation device 50 (not shown) installed on an indoor wall surface or the like.

[0034] The control unit 36 includes a first operation control unit 38, a second operation control unit 40, a third operation control unit 42, a detection result receiving unit 44, and a processing unit 46.

[0035] Based on the information output from the processing unit 46, the first operation control unit 38 controls the operation of the exhaust blower 14. The information output from the processing unit 46 is information related to the operation output of the exhaust blower 14.

[0036] Based on the information output from the processing unit 46, the second operation control unit 40 controls the operation of the air supply blower 16. The information output from the processing unit 46 is information related to the operation output of the air supply blower 16.

[0037] Based on the information output from the processing unit 46, the third operation control unit 42 controls the operation of the actuator 32. The information output from the processing unit 46 is information related to the rotation angle of the actuator 32.

[0038] The detection result receiving unit 44 receives the detection result of the differential pressure sensor 35. The detection result of the differential pressure sensor 35 is the differential pressure (P1 - P2 or P2 - P1) between the first pressure P1 and the second pressure P2.

[0039] The processing unit 46 processes various information obtained from the remote controller or the detection result receiving unit 44, and outputs the processing result to any one or a plurality of the first operation control unit 38, the second operation control unit 40, and the third operation control unit 42.

[0040] The above is the configuration of the ventilation device 50.

[0041] (Operation of the ventilation device 50) First, with reference to FIG. 3, the operation of the comparative example will be described. FIG. 3 is a diagram for explaining the air flow of the operation of the comparative example.

[0042] When the operation of the ventilation device 50 is started in a state where it is installed on the ceiling surface of the building or the like, an external static pressure due to a fixed duct routing is applied to the ventilation device 50. The control unit 36 controls the operation outputs of the exhaust blower 14 and the supply blower 16 so that the air volume conveyed outdoors through the outdoor exhaust port 20 (hereinafter referred to as the exhaust air volume A20) and the air volume conveyed indoors through the indoor supply port 24 (hereinafter referred to as the supply air volume A24) are the same air volume in a state where the external static pressure is applied.

[0043] In the comparative example, as shown in FIG. 3, the exhaust air volume A20 and the supply air volume A24 are each set to 250 [m3 / h] (hereinafter, the unit of the air volume is [m3 / h] = "legislative meter / hour"). When there is no air leakage (hereinafter referred to as "leak"), the air sucked from indoors through the indoor exhaust port 18 (hereinafter referred to as the exhaust air volume A18) is equal to the exhaust air volume A20, and the air sucked from outdoors through the outdoor supply port 22 (hereinafter referred to as the supply air volume A22) is equal to the supply air volume A24.

[0044] However, there are slight gaps between the exhaust air duct 10 and the supply air duct 12 of the ventilation device 50, and leaks occur between them. Also, when the heat exchange element 26 is replaced or maintained, the gap between the exhaust air duct 10 and the supply air duct 12 changes, and the leak may increase compared to before the replacement or maintenance of the heat exchange element 26.

[0045] Here, the relationship between the leak from the indoor exhaust port 18 to the indoor supply port 24 (hereinafter referred to as the indoor leak amount AL1) and the leak from the outdoor supply port 22 to the outdoor exhaust port 20 (hereinafter referred to as the outdoor leak amount AL2), and the first pressure P1 and the second pressure P2 will be described.

[0046] The influence on the magnitudes of the indoor leakage amount AL1 and the outdoor leakage amount AL2 is dominated by the first pressure P1 (the static pressure upstream of the heat exchange element 26 in the exhaust air duct 10 among the static pressures inside the ventilation device 50) and the second pressure P2 (the static pressure upstream of the heat exchange element 26 in the supply air duct 12). For example, if the first pressure P1 increases, the indoor leakage amount AL1 also increases; if the first pressure P1 decreases, the indoor leakage amount AL1 also decreases. Also, if the second pressure P2 increases, the outdoor leakage amount AL2 also increases; if the second pressure P2 decreases, the outdoor leakage amount AL2 also decreases.

[0047] Here, consider the case where the first pressure P1 is greater than the second pressure P2 (P1 > P2), and there is a leakage amount of 50 [m3 / h] in the indoor leakage amount AL1 and a leakage amount of 30 [m3 / h] in the outdoor leakage amount AL2. In this case, since the supply air volume A24 is adjusted to 250 [m3 / h] respectively, the supply air volume A22 is the value obtained by adding the outdoor leakage amount AL2 to the value obtained by subtracting the indoor leakage amount AL1 from the supply air volume A24. That is, the supply air volume A22 is 250 [m3 / h] - 50 [m3 / h] + 30 [m3 / h] = 230 [m3 / h]. Thus, the exhaust air volume A20 exceeds the supply air volume A22 by 20 [m3 / h], and the building becomes a negative pressure (also called a depression pressure) of 20 [m3 / h]. When the building becomes a negative pressure, condensation may occur on the duct surface and the water droplets may cause stains on the ceiling. Thus, in the comparative example, there is a possibility that the building becomes a negative pressure due to leakage.

[0048] Based on the description of the comparative example, an example of the operation of the ventilation device 50 of the present embodiment will be described.

[0049] Referring to FIG. 4, the operation of opening and closing the exhaust air duct 10 by the operation control of the exhaust air duct opening / closing part 28 based on the detection result of the differential pressure sensor 35 will be described. FIG. 4 is a flowchart showing the operation of opening and closing the exhaust air duct 10 by the operation control of the exhaust air duct opening / closing part 28 based on the detection result of the differential pressure sensor 35.

[0050] First, when the user instructs the control unit 36 to start the operation of the ventilation device 50 via a remote controller or the like, in step S1, the control unit 36 uses the first operation control unit 38 and the second operation control unit 40 to control the operation outputs of the exhaust blower 14 and the supply blower 16 so that the exhaust air volume A20 and the supply air volume A24 are each 250 [m3 / h]. Also, in step S1, the control unit 36 uses the third operation control unit 42 to control the operation (rotation angle) of the actuator 32 so that the exhaust air passage 10 is in a fully open state. The state where the exhaust air passage 10 is in a fully open state refers to the state where the air resistance (pressure loss) of the damper 30 against the exhaust air flow is minimized. In the present embodiment, the rotation angle of the damper 30 is Deg, and the rotation angle of the damper 30 when the exhaust air passage 10 is in a fully open state is set to Deg = 0°. When starting the operation control of the exhaust blower 14, the supply blower 16, and the actuator 32, the control unit 36 proceeds to step S2.

[0051] In step S2, the control unit 36 uses the detection result receiving unit 44 to receive the detection result of the differential pressure sensor 35, that is, the information related to the differential pressure between the first pressure P1 and the second pressure P2. During the operation of the ventilation device 50, the differential pressure sensor 35 continuously transmits the detection result to the detection result receiving unit 44.

[0052] In step S2, when the control unit 36 receives the detection result of the differential pressure sensor 35, it determines whether the first pressure P1 is greater than the second pressure P2.

[0053] Here, since the information received by the detection result receiving unit 44 from the differential pressure sensor 35 is information related to the differential pressure between the first pressure P1 and the second pressure P2, the magnitude relationship between the first pressure P1 and the second pressure P2 with respect to the differential pressure is determined in advance. In the present embodiment, if the differential pressure of the second pressure P2 with respect to the first pressure P1 is positive (P1 - P2 > 0), the first pressure P1 is greater than the second pressure P2. Also, if the differential pressure of the second pressure P2 with respect to the first pressure P1 is 0 (P1 - P2 = 0), the first pressure P1 and the second pressure P2 are equal. If the differential pressure of the second pressure P2 with respect to the first pressure P1 is negative (P1 - P2 < 0), the first pressure P1 is smaller than the second pressure P2.

[0054] In step 2, when it is determined that the first pressure P1 is not greater than the second pressure P2 (P1 - P2 = 0, or P1 - P2 < 0) (N in step S2), the control unit 36 returns to step S1.

[0055] In step S2, when it is determined that the first pressure P1 is greater than the second pressure P2 (P1 - P2 > 0) (Y in step S2), the control unit 36 proceeds to step S3.

[0056] In step S3, the control unit 36 uses the third operation control unit 42 to control the operation of the actuator 32 so that Deg = 10° × n. n is a dimensionless integer (n = 1, 2, 3 ···). In step S3, n = 1. When n = 1, the control unit 36 uses the third operation control unit 42 to control the operation of the actuator 32 so that Deg = 10° × 1 = 10°. After controlling the operation of the actuator 32 so that Deg = 10°, the control unit 36 proceeds to step S4.

[0057] In step S4, the control unit 36 determines whether the first pressure P1 is greater than the second pressure P2. In step S4, when it is determined that the first pressure P1 is greater than the second pressure P2 (P1 - P2 > 0) (Y in step S4), the control unit 36 proceeds to step S5.

[0058] In step S5, the control unit 36 increases the value of the integer n by one to make n = 2. After making n = 2, the control unit 36 returns to step S3.

[0059] In step S3, the control unit 36 uses the third operation control unit 42 to control the operation of the actuator 32 so that Deg = 10° × 2 = 20°. After controlling the operation of the actuator 32 so that Deg = 20°, the control unit 36 proceeds to step S4. That is, in step S4, the control unit 36 repeats steps S3 to S5 until it is determined that the first pressure P1 is not greater than the second pressure P2 (P1 - P2 = 0 or P1 - P2 < 0). Each time step S5 is passed through, the integer n increases its value one by one as n = 1, 2, 3 ···. By setting n = 1, 2, 3 ···, the control unit 36 uses the third operation control unit 42 to control the operation of the actuator 32 so that Deg = 10°, 20°, 30° ···. However, in this embodiment, n = 9 (Deg = 90°) is the maximum value.

[0060] In step S4, if it is determined that the first pressure P1 is not greater than the second pressure P2 (P1 - P2 = 0 or P1 - P2 < 0), the control unit 36 ends the step.

[0061] The above is the operation of opening and closing the exhaust air passage 10 by the operation control of the exhaust air passage opening and closing unit 28 based on the detection result of the differential pressure sensor 35.

[0062] (Features of the ventilation device 50) With reference to FIGS. 5 and 6, the features of the ventilation device 50 will be described. FIGS. 5 and 6 are diagrams showing the air flow of the operation of the ventilation device 50.

[0063] The damper 30 plays a role in the air resistance (pressure loss) against the exhaust flow. As the rotation angle of the damper 30 (actuator 32) is increased as Deg = 10°, 20°, 30° ···, the air resistance of the damper 30 against the exhaust flow increases. When the air resistance against the exhaust flow increases, the first pressure P1 decreases and the second pressure P2 increases.

[0064] That is, when the first pressure P1 is greater than the second pressure P2 (P1 - P2 > 0), as the rotation angle of the damper 30 (actuator 32) increases such as Deg = 10°, 20°, 30° ···, the differential pressure between the first pressure P1 and the second pressure P2 decreases.

[0065] As shown in FIG. 5, considering the case where the differential pressure between the first pressure P1 and the second pressure P2 becomes 0 (P1 - P2 = 0) at Deg = 50°, the indoor leakage rate AL1 and the outdoor leakage rate AL2 are each 40 [m3 / h]. As a result, the supply air volume A22 is 250 [m3 / h] (supply air volume A24) - 40 [m3 / h] (indoor leakage rate AL1) + 40 [m3 / h] (outdoor leakage rate AL2) = 250 [m3 / h]. That is, by making the indoor leakage rate AL1 and the outdoor leakage rate AL2 equal, the exhaust air volume A20 (250 [m3 / h]) and the supply air volume A22 (250 [m3 / h]) become equal, so it is possible to alleviate the building from becoming negative pressure.

[0066] Also, as shown in FIG. 6, considering the case where the rotation angle Deg is further increased and the first pressure P1 becomes smaller than the second pressure P2 (P1 - P2 < 0) (for example, Deg = 70°), the indoor leakage rate AL1 becomes 30 [m3 / h] and the outdoor leakage rate AL2 becomes 50 [m3 / h]. As a result, the supply air volume A22 is 250 [m3 / h] (supply air volume A24) - 30 [m3 / h] (indoor leakage rate AL1) + 50 [m3 / h] (outdoor leakage rate AL2) = 270 [m3 / h]. That is, since the indoor leakage rate AL1 is smaller than the outdoor leakage rate AL2, the supply air volume A22 exceeds the exhaust air volume A20 by 20 [m3 / h], and the building becomes a positive pressure (also called overpressure) of 20 [m3 / h]. When the building becomes positive pressure, not only can condensation on the duct surface be suppressed, but it is also possible to suppress fine floating substances such as dust and pollen from entering the room.

[0067] As described above, the present invention has been described based on the embodiments. It is understood by those skilled in the art that these embodiments are examples, and various modifications are possible for each component or combination of each processing process, and such modifications are also within the scope of the present disclosure.

[0068] (Modified Example) Next, a modified example of the ventilation device 50 in the present embodiment will be described. The description will focus on the differences from the above-described embodiment.

[0069] In addition to the above-described embodiment, the ventilation device 50 further includes a storage unit (not shown). The storage unit is provided in the control unit 36, for example. The storage unit is a so-called memory that stores the opening / closing state of the exhaust air passage opening / closing unit 28 at the time of the previous stop of the ventilation operation. The opening / closing state of the exhaust air passage opening / closing unit 28 is the rotation angle of the damper 30 in the present embodiment, and if the dimensionless integer n used to control the operation of the actuator 32 is known, the rotation angle of the damper 30 is known. That is, in the present embodiment, the storage unit stores the dimensionless integer n as a stored value.

[0070] Referring to FIG. 7, a modified example of the operation of opening and closing the exhaust air passage 10 by the operation control of the exhaust air passage opening / closing unit 28 based on the detection result of the differential pressure sensor 35 will be described. FIG. 7 is a flowchart showing the operation of opening and closing the exhaust air passage 10 by the operation control of the exhaust air passage opening / closing unit 28 based on the detection result of the differential pressure sensor 35 in the modified example.

[0071] When the ventilation device 50 starts to be supplied with power from an outlet or the like, the control unit 36 controls the operation (rotation angle) of the actuator 32 so that the rotation angle of the damper 30 becomes Deg = 0° (step S11).

[0072] When the user instructs the control unit 36 to start the ventilation operation of the ventilation device 50 via a remote controller or the like (Y in step S12), the control unit 36 proceeds to the step of starting the operation (step S13).

[0073] In step S13, the control unit 36 uses the first operation control unit 38 and the second operation control unit 40 to control the operation outputs of the exhaust air blower 14 and the supply air blower 16 so that the exhaust air volume A20 and the supply air volume A24 each become 250 [m3 / h].

[0074] The control unit 36 acquires a stored value from the storage unit. In the present embodiment, the initial value of the stored value is set to 0. The control unit 36 sets the stored value to n. The control unit 36 controls the operation (rotation angle) of the actuator 32 using the third operation control unit 42 so that Deg = 10°×n (n = 0) = 0°.

[0075] When the user does not give an instruction to stop the operation of the ventilation device 50 to the control unit 36 via a remote controller or the like (N in step S14), the control unit 36 proceeds to a step of performing a pressure determination (step S15).

[0076] In step 15, the control unit 36 uses the detection result receiving unit 44 to receive the detection result of the differential pressure sensor 35, that is, information related to the differential pressure between the first pressure P1 and the second pressure P2. During the operation of the ventilation device 50, the differential pressure sensor 35 continuously transmits the detection result to the detection result receiving unit 44. When the control unit 36 receives the detection result of the differential pressure sensor 35, it determines the magnitude relationship between the first pressure P1 and the second pressure P2 as the pressure determination.

[0077] When the first pressure P1 and the second pressure P2 are equal (C in step S15), the control unit 36 returns to step S14.

[0078] When the first pressure P1 is greater than the second pressure P2 (A in step S15), the control unit 36 increments the value of n (increases n by 1) (step S16). However, in the present embodiment, n = 9 (Deg = 90°) is the maximum value. The control unit 36 stores the incremented n in the storage unit as a new stored value (step S18). Then, the control unit 36 controls the operation (rotation angle) of the actuator 32 based on the incremented n so that Deg = 10°×n (step S19), and returns to step S14.

[0079] When the first pressure P1 is smaller than the second pressure P2 (B in step S15), the control unit 36 decrements the value of n (n is decreased by 1) (step S17). However, in the present embodiment, n = 0 (Deg = 0°) is the minimum value. The control unit 36 stores the decremented n in the storage unit as a new stored value (step S18). Then, based on the decremented n, the control unit 36 controls the operation (rotation angle) of the actuator 32 so that Deg = 10°×n (step S19), and returns to step S14.

[0080] By repeatedly performing steps S14 to S19 by the control unit 36, the first pressure P1 and the second pressure P2 can be made closer to the same pressure. As a result, the negative pressure inside the building can be relieved, not only suppressing condensation on the duct surface, but also suppressing the intrusion of minute floating substances such as dust and pollen into the room. Also, by controlling so that the first pressure P1 and the second pressure P2 become the same pressure, it is possible to prevent operation in an excessive positive pressure state. Here, to make the inside of the building in a positive pressure state, it is necessary to increase the rotation angle of the damper 30. However, the larger the rotation angle of the damper 30, the greater the air resistance of the damper 30 against the exhaust flow. That is, the larger the rotation angle of the damper 30, the greater the power consumption of the motor. The excessive positive pressure state means a state where the rotation angle of the damper 30 is too large. By performing this control, it is possible to prevent operation in an excessive positive pressure state, so that the power consumption of the motor can be suppressed. Also, reducing the air resistance of the damper 30 against the exhaust flow leads to a reduction in the load on the motor, which can contribute to extending the life of the motor.

[0081] When the user instructs the control unit 36 to stop the ventilation operation of the ventilation device 50 via a remote controller or the like (Y in step S14), the control unit 36 proceeds to the step of stopping the operation (step S20). Here, as an example, it is assumed that the user instructs the control unit 36 to stop the operation of the ventilation device 50 via a remote controller or the like in a state where n = 6 (Deg = 60°) is stored in the storage unit as the stored value.

[0082] In step S20, the control unit 36 uses the first operation control unit 38 and the second operation control unit 40 to control the operation outputs of the exhaust blower 14 and the supply blower 16 so that the exhaust air volume A20 and the supply air volume A24 each become 0 [m3 / h]. The control unit 36 controls the operation (rotation angle) of the actuator 32 so that the rotation angle of the damper 30 becomes Deg = 0°, and returns to the step (step S12) of determining the start of the ventilation operation of the ventilation device 50.

[0083] In step 12, when the control unit 36 is instructed again to start the ventilation operation of the ventilation device 50 (Y in step S12), the control unit 36 uses the first operation control unit 38 and the second operation control unit 40 to control the operation outputs of the exhaust blower 14 and the supply blower 16 so that the exhaust air volume A20 and the supply air volume A24 each become 250 [m3 / h]. The control unit 36 acquires a stored value from the storage unit. The control unit 36 sets 6, which is the stored value, to n. The control unit 36 uses the third operation control unit 42 to control the operation (rotation angle) of the actuator 32 so that Deg = 10° × n (n = 6) = 60°.

[0084] Thereby, it is possible to set the rotation angle of the damper 30 at the time of the previous ventilation operation stop. That is, it is possible to start the operation from the rotation angle of the damper 30 at the time of the previous operation stop, and it is possible to relieve the negative pressure earlier.

[0085] The outline of the modification is as follows. The differential pressure sensor detects the pressure difference between the first pressure, which is the pressure of the air sucked from the indoor side through the indoor exhaust port, and the second pressure, which is the pressure of the air sucked from the outside through the outdoor supply port on the outdoor side. When the first pressure is greater than the second pressure, the control unit controls the exhaust air passage opening / closing unit so that the first pressure becomes equal to or less than the second pressure. When the first pressure is less than the second pressure, the control unit controls the exhaust air passage opening / closing unit so that the first pressure becomes equal to or greater than the second pressure.

[0086] As a result, the first pressure and the second pressure can be made closer to the same pressure. Consequently, the negative pressure inside the building can be alleviated, not only suppressing condensation on the duct surface but also preventing minute floating substances such as dust and pollen from entering the room. Further, by controlling the first pressure P1 and the second pressure P2 to be the same pressure, it is possible to prevent operation in an excessive positive pressure state. As a result, the power consumption of the exhaust air duct opening / closing section can be suppressed. Also, since the load applied to the exhaust air duct opening / closing section can be reduced, it can contribute to extending the service life of the exhaust air duct opening / closing section.

[0087] Further, it includes a storage unit that stores the open / closed state of the exhaust air duct opening / closing section at the time of the previous ventilation operation stop, and the control unit controls the exhaust air duct opening / closing section to the open / closed state of the exhaust air duct opening / closing section at the time of the previous ventilation operation stop stored by the storage unit when the ventilation operation starts.

[0088] As a result, at the start of the ventilation operation, it is possible to set the open / closed state of the exhaust air duct opening / closing section at the time of the previous ventilation operation stop. That is, it is possible to start the operation from the open / closed state of the exhaust air duct opening / closing section at the time of the previous operation stop, and it is possible to alleviate the negative pressure more quickly.

Industrial Applicability

[0089] The ventilation device according to the present invention can be installed, for example, in the ceiling space and used for ventilation of a building.

Explanation of Signs

[0090] 10 Exhaust air duct 12 Supply air duct 14 Exhaust blower 16 Supply air blower 18 Indoor exhaust port 20 Outdoor exhaust port 22 Outdoor supply air port 24 Indoor supply air port 26 Heat exchange element 28 Exhaust air duct opening / closing section 30 Damper 32 Actuator 34 Air flow sensor 35 Differential pressure sensor 36 Control unit 38 First operation control unit 40 Second operation control unit 42 Third operation control unit 44 Detection result receiving unit 46 Processing unit 50 Ventilation device

Claims

1. An exhaust air duct for conveying air sucked from indoors through an indoor exhaust port to the outdoors through an outdoor exhaust port by an exhaust blower, An intake air duct for conveying air sucked from the outdoors through an outdoor intake port to the indoors through an indoor intake port by an intake blower, A heat exchange element for exchanging heat between the air passing through the exhaust air duct and the air passing through the intake air duct, An exhaust air duct opening / closing part for opening and closing the exhaust air duct, An air flow sensor for detecting information regarding the air passing through the exhaust air duct and the air passing through the intake air duct, A control part for controlling the exhaust air duct opening / closing part based on the detection result of the air flow sensor, A ventilation device comprising: The air flow sensor, Includes a differential pressure sensor that detects the pressure difference between the pressure of the air sucked from indoors through the indoor exhaust port and the pressure of the air sucked from the outdoors through the outdoor intake port, The control part, Based on the detection result of the differential pressure sensor, controls the exhaust air duct opening / closing part so that the intake air volume is equal to or greater than the exhaust air volume, Ventilation device.

2. The differential pressure sensor, Detects the pressure difference between a first pressure that is the pressure of the air sucked from indoors through the indoor exhaust port and a second pressure that is the pressure of the air sucked from the outdoors through the outdoor intake port, The control part, When the first pressure is greater than the second pressure, controls the exhaust air duct opening / closing part so that the first pressure becomes equal to or less than the second pressure, The ventilation device according to Claim 1.

3. The control part, When the first pressure is less than the second pressure, controls the exhaust air duct opening / closing part so that the first pressure becomes equal to or greater than the second pressure, The ventilation device according to Claim 2.

4. Comprises a storage part that stores the opening / closing state of the exhaust air duct opening / closing part at the time of the previous ventilation operation stop, and the control part, At the start of the ventilation operation, controls the exhaust air duct opening / closing part to the opening / closing state of the exhaust air duct opening / closing part at the time of the previous ventilation operation stop stored by the storage part. The ventilation device according to any one of Claims 1 to 3.

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