JP7309066B2 - heat exchange ventilation system - Google Patents

Description

The present disclosure relates to a heat exchange ventilator provided with a heat exchanger that exchanges heat between airflows flowing through a supply airflow path and an exhaust airflow path.

Conventionally, a heat exchange type ventilation system has heat exchange ventilation in which heat is exchanged between the air currents flowing through the supply air path and the exhaust air path, and heat exchange between the air currents flowing in the supply air path and the exhaust air path. There are models that are capable of switching between non-heat exchange ventilation and non-heat exchange ventilation. In such a heat exchange type ventilator, the air passage is controlled so as to maintain the air passage in the heat exchanging ventilation state when stopped. For this reason, if there is a pressure difference between the indoor space to be ventilated by the heat exchange ventilator and the outdoor space, and the indoor pressure is negative, the outside air will flow through the air passage of the heat exchange ventilator. flow into the room. Then, the outside air flowing into the room passes through the heat exchanger.

At this time, when fog is generated or the outside air is in a high humidity state, the heat exchange type ventilator unintentionally takes in the air. As a result, water condenses inside the heat exchanger, and the condensed water adheres to the inside of the heat exchanger, accelerating deterioration of the heat exchanger. In addition, if the negative pressure in the room is constantly generated due to local ventilation by other ventilation devices installed in the room, the negative pressure in the room will make it difficult to open the door and prevent it from entering the room. There is concern about drafts.

As a method of suppressing negative pressure in the room by local ventilation, additional ventilation fans and installation of pass ducts to supply air to the room can be considered. However, in this case, an additional expense is required, and if the ventilation fan is to be added, an additional electricity charge is also required.

Patent Literature 1 describes suppressing excessive negative pressure in the room by stopping and operating the exhaust of the heat exchange type ventilator according to the operating and stopping actions of the local ventilation.

JP 2013-195010 A

However, in Patent Document 1, the control is based on the premise that the heat exchange type ventilator is always operating. On the other hand, in non-residential buildings, it is assumed that the ventilation of private areas such as offices is stopped and the ventilation of common areas such as toilets is continued. As countermeasures against the negative pressure in the room that occurs in this case, it is assumed that the user will be troubled by operating the ventilation system and opening the windows, etc., and there is no certainty as a countermeasure.

The present disclosure has been made in view of the above, and does not require the addition of air supply equipment such as a ventilation fan or a pass duct as a countermeasure against the negative pressure in the room during shutdown. An object of the present invention is to obtain a heat exchange type ventilator capable of suppressing deterioration of a vessel.

In order to solve the above-described problems and achieve the object, the heat exchange type ventilation device according to the present disclosure includes an exhaust air passage for exhausting indoor air to the outside, a supply air passage for supplying outdoor air to the room, is independently formed inside; an exhaust blower provided in the exhaust air passage to generate an exhaust flow flowing through the exhaust air passage; A supply air blower and a heat exchanger provided across the supply air path and the exhaust air path for exchanging heat between the supply air flow and the exhaust air flow are provided. In addition, the heat exchange type ventilator includes a bypass air passage that bypasses the heat exchanger and is installed in at least one of the exhaust air passage and the air supply air passage that passes through the heat exchanger, and an air passage that passes through the heat exchanger. an air path switching damper for switching between the air path and the bypass air path; and a control unit for controlling the operation of the exhaust fan, the operation of the supply air fan, and the operation of the air path switching damper. The control unit arranges the air path switching damper in an open position for opening the bypass air path in a state where the supply air fan and the exhaust air fan are stopped.

The heat exchange type ventilation device according to the present disclosure does not require the addition of air supply equipment such as a ventilation fan or a pass duct as a countermeasure against negative pressure in the room when stopped, and prevents deterioration of the heat exchanger caused by the inflow of outside air when stopped. There is an effect that it can be suppressed.

1 is a perspective view showing a heat exchange ventilator according to Embodiment 1. FIG. 1 is a diagram schematically showing the inside of the heat exchange ventilator according to the first embodiment; FIG. FIG. 2 is a conceptual diagram showing an image of the flow of exhaust gas during heat exchange ventilation operation in the heat exchange ventilation system according to Embodiment 1. FIG. FIG. 2 is a conceptual diagram showing an image of an exhaust flow during non-heat-exchange ventilation operation of the heat-exchange ventilator according to Embodiment 1. FIG. FIG. 2 is a block diagram showing a functional configuration related to control of the heat exchange ventilator according to the first embodiment; FIG. 4 is a flow chart showing the control procedure of the control unit when the heat exchange type ventilator according to the first embodiment stops FIG. 4 is a conceptual diagram showing the position of the first air path switching damper when the heat exchange type ventilator according to the first embodiment is stopped. FIG. 11 is a conceptual diagram showing the position of the second air path switching damper when the heat exchange type ventilator according to the second embodiment is stopped. FIG. 10 is a conceptual diagram showing the positions of the first air path switching damper and the second air path switching damper when the heat exchange type ventilator according to the third embodiment is stopped; FIG. 10 is a conceptual diagram showing an image of the air flow when the heat exchange type ventilation device according to the fourth embodiment is stopped. Conceptual diagram showing an image of air flow during operation of the heat exchange ventilator according to the fourth embodiment. FIG. 1 is a first diagram showing an example of a hardware configuration of a control unit included in the heat exchange ventilator according to the first embodiment; FIG. 2 is a second diagram showing an example of the hardware configuration of the control unit of the heat exchange ventilator according to the first embodiment;

A heat exchange ventilator according to an embodiment will be described in detail below with reference to the drawings.

Embodiment 1.
FIG. 1 is a perspective view showing a heat exchange ventilator according to Embodiment 1. FIG. FIG. 2 is a diagram schematically showing the inside of the heat exchange ventilator according to the first embodiment. The heat exchange type ventilator 1 is a device capable of performing ventilation while exchanging heat between an air supply flow and an exhaust air flow.

The heat exchange ventilator 1 maintains a comfortable indoor air environment by ventilating the room by supplying air from the outdoors to the room and exhausting air from the room to the outside. In addition, the heat exchange type ventilator 1 reduces the temperature difference between the air taken into the room and the air in the room by heat exchange between the supply air flow and the exhaust air flow, thereby reducing the burden of air conditioning in the room. The heat exchange type ventilator 1 is installed in the space behind the ceiling.

In the heat exchange type ventilator 1, a heat exchanger 2 that exchanges heat between a supply air flow and an exhaust air flow is housed in a casing 5. As shown in FIG. The casing 5 is a hexahedron including a top plate 3 and a bottom plate 4 and constitutes the main body of the heat exchange ventilator 1 . Inside the casing 5, there are provided an air supply air passage 31 through which an air supply flow passes, an exhaust air passage 32 as a heat exchange exhaust air passage through which an exhaust air flow passes, a partition wall 17 that partitions the air supply air passage 31 and the exhaust air passage 32, 18 are provided. FIG. 1 shows the heat exchange ventilator 1 with the top plate 3 removed from the casing 5 . In addition, in Embodiment 1, the heat exchange type ventilator 1 is installed with the top plate 3 facing vertically upward.

A supply air inlet 13 and an exhaust air outlet 14 are provided on one side surface of the casing 5 . A supply air outlet 15 and an exhaust air suction port 16 are provided on a side surface of the casing 5 that faces the side surface. The air supply inlet 13 is connected to an outdoor air supply duct (not shown) that communicates the outdoor air with the air supply inlet 13 . The air supply outlet 15 is connected to an indoor air supply duct (not shown) that communicates the room with the air supply outlet 15 . A room-side exhaust duct (not shown) that communicates the interior of the room with the exhaust air inlet 16 is connected to the exhaust air inlet 16 . An outdoor-side exhaust duct (not shown) that communicates the exhaust air outlet 14 with the outside of the room is connected to the exhaust air outlet 14 .

Outside air is taken into the supply air passage 31 from the supply air inlet 13 via the outdoor air supply duct. The outside air taken into the supply air passage 31 passes through the supply air passage 31 and is blown out into the room from the air supply outlet 15 through the indoor side air supply duct. Air in the room is taken in from the exhaust suction port 16 to the exhaust air passage 32 via the indoor-side exhaust duct. The air taken into the exhaust air passage 32 passes through the exhaust air passage 32 and is blown out of the room from the exhaust outlet 14 through the outdoor exhaust duct. That is, an exhaust air passage 32 for discharging indoor air to the outside and a supply air passage 31 for supplying outdoor air to the room are formed independently inside the casing 5 .

The heat exchanger 2 is provided across the supply airflow path 31 and the exhaust airflow path 32, and performs total heat exchange between the supply air flow and the exhaust flow. The heat exchanger 2 has a primary side air passage through which the exhaust flow passes and a secondary side air passage through which the supply air flow passes. Inside the heat exchanger 2, the primary air passage and the secondary air passage intersect perpendicularly. The primary side air passage and the secondary side air passage are formed by a laminated body configured by alternately laminating and adhering flat sheets and corrugated sheets, which are corrugated paperboards. In FIG. 1, illustration of the primary side air passage and the secondary side air passage is omitted. The laminate has a quadrangular prism shape. The end surfaces of the heat exchanger 2 located at both ends in the stacking direction are square. The lamination direction is the direction in which the flat paper and the corrugated sheet are laminated.

The heat exchanger 2 has four ridges parallel to the stacking direction. The heat exchanger 2 is accommodated in the casing 5 so that each ridgeline portion faces the top plate 3, the bottom plate 4, the partition wall 17 and the partition wall 18, respectively. That is, the heat exchanger 2 is arranged in a central region inside the casing 5 in a state in which the axial direction of a quadrangular prism is oriented horizontally, and the diagonal lines of the end surfaces located at both ends are oriented vertically and horizontally. It has been incorporated.

The supply air passage 31 is an air passage for supplying outside air, which is outdoor air, into the room. It has a downstream side supply air passage 31b formed between the heat exchanger 2 and the supply air outlet 15, and an internal heat exchanger supply air passage 31c that is the air supply passage 31 in the heat exchanger 2. ing. That is, the upstream supply air passage 31a is an upstream air supply passage that is upstream of the heat exchanger 2 in the air supply passage 31 and communicates with the outside of the room. In addition, the downstream air supply air passage 31b is a downstream air supply air passage that is downstream of the heat exchanger 2 in the air supply air passage 31 and communicates with the interior of the room.

The exhaust air passage 32 is an air passage for discharging return air, which is indoor air, to the outside. It has a downstream exhaust air passage 32b formed between the device 2 and the exhaust air outlet 14, and a heat exchanger internal exhaust air passage 32c, which is the exhaust air passage 32 in the heat exchanger 2. That is, the upstream exhaust air passage 32a is an upstream exhaust air passage that is upstream of the heat exchanger 2 and communicates with the interior of the room. Further, the downstream exhaust air passage 32b is a downstream exhaust air passage that is downstream of the heat exchanger 2 and communicates with the outside of the room.

The exhaust air passage 32 configured in this manner is a heat exchange exhaust air passage that connects the exhaust air inlet 16 and the exhaust air outlet 14 via the heat exchanger 2 and discharges indoor air to the outside.

A heat exchange type ventilator 1 has a supply air blower 11 for taking in outdoor air and sending the taken in air indoors, and an exhaust fan 12 for taking in indoor air and sending the taken in air outside.

The supply air blower 11 is arranged in the downstream supply air passage 31 b and generates an supply air flow from the supply air inlet 13 toward the supply air outlet 15 . The supply air blower 11 includes centrifugal multi-blade blades in the supply air blower casing 7 and an air supply electric motor for rotating the centrifugal multi-blade blades. The air supply blower 11 generates an air supply flow by rotating centrifugal multi-blade blades with an air supply electric motor. In the figure, illustration of the centrifugal multi-blade blades and the air supply electric motor is omitted. The operation of the supply air blower 11 is controlled by the control unit 35 by controlling the operation, stop, and rotational speed of the air supply electric motor by the control unit 35 to be described later.

The supply air blower casing 7 forms a scroll casing of the supply air blower 11 and constitutes a partition wall 18 that separates the supply air passage 31 and the exhaust air passage 32 .

The exhaust blower 12 is arranged in the downstream exhaust air passage 32 b and generates an exhaust flow from the exhaust inlet 16 toward the exhaust outlet 14 . The exhaust blower 12 includes centrifugal multi-blade blades in the exhaust blower casing 8 and an exhaust electric motor for rotating the centrifugal multi-blade blades. The exhaust blower 12 generates an exhaust flow by rotating centrifugal multi-blade blades with an exhaust electric motor. In the figure, illustration of the centrifugal multi-blade blades and the exhaust electric motor is omitted. The operation of the exhaust air blower 12 is controlled by the controller 35 by controlling the operation, stop, and rotation speed of the exhaust electric motor by the controller 35 , which will be described later.

The exhaust blower casing 8 forms a scroll casing of the exhaust blower 12 and constitutes a partition wall 17 that separates the supply air passage 31 and the exhaust air passage 32 .

A maintenance cover is provided on the front surface of the casing 5, which is one of the side surfaces other than the side surface having the air supply inlet 13 and the exhaust air outlet 14 and the side surface having the air supply outlet 15 and the exhaust air inlet 16. 6 and a control unit 9 are provided. Maintenance cover 6 is provided at a position facing one end surface of heat exchanger 2 . By opening the maintenance cover 6, the heat exchanger 2 can be pulled out from the casing 5 to the outside and can be inserted into the casing 5 from the outside. The control unit 9 controls the entire heat exchange ventilator 1 .

A guide rail 21 , a guide rail 22 , a guide rail 23 and a guide rail 24 for supporting the heat exchanger 2 are provided inside the casing 5 . A guide rail 21 is provided on the top plate 3 . One of the four ridges directed toward the top plate 3 is inserted into the guide rail 21 . The guide rails 22 are provided on the bottom plate 4 . One of the four ridges directed toward the bottom plate 4 is inserted into the guide rail 22 . The guide rail 23 is provided on the partition wall 17 . One of the four ridges facing the partition wall 17 is inserted into the guide rail 23 . The guide rail 24 is provided on the partition wall 18 . One of the four ridges facing the partition wall 18 is inserted into the guide rail 24 . By moving the heat exchanger 2 along the guide rails 21 , 22 , 23 , 24 with the maintenance cover 6 open, the heat exchanger 2 is pulled out and inserted.

The interior of the casing 5 is partitioned into four independent spaces separated from each other by the heat exchanger 2, the guide rails 21, 22, 23, 24, and the partition walls 17, 18, and the four spaces are used for the upstream feed. An air passage 31a, a downstream supply air passage 31b, an upstream exhaust air passage 32a, and a downstream exhaust air passage 32b.

FIG. 3 is a conceptual diagram showing an image of an exhaust flow during heat exchange ventilation operation in the heat exchange ventilator according to the first embodiment. FIG. 4 is a conceptual diagram showing an image of the flow of the exhaust gas during the non-heat exchange ventilation operation of the heat exchange ventilator according to the first embodiment. Arrows in FIGS. 3 and 4 indicate the flow of air currents.

Inside the casing 5, there is an exhaust-side bypass air passage 50 that is a bypass air passage that bypasses the heat exchanger 2 by being attached to the air passage passing through the heat exchanger 2 in the exhaust air passage 32 that is a heat exchange exhaust air passage. formed. The exhaust side bypass air passage 50 is an air passage that bypasses the heat exchanger 2 and connects the upstream side exhaust air passage 32a and the downstream side exhaust air passage 32b. A bypass air passage for exhaust flow. The exhaust-side bypass air passage 50 is a non-heat exchange air passage that does not pass through the heat exchanger 2 . Then, the upstream exhaust air passage 32 a on the upstream side of the heat exchanger 2 and the downstream exhaust air passage 32 b on the downstream side of the heat exchanger 2 are connected by the exhaust side bypass air passage 50 without passing through the heat exchanger 2 . An exhaust-side non-heat exchange air passage 101 that is a connected non-heat exchange air passage is formed inside the casing 5 .

In the heat exchange type ventilator 1, the exhaust flow, which is the flow of indoor air sucked from the exhaust air suction port 16, is passed through the heat exchanger 2 by flowing the exhaust flow through the heat exchanger 2, thereby Heat exchange ventilation can be performed with heat exchange with the exhaust stream. On the other hand, in the heat exchange type ventilator 1, the exhaust flow, which is the air flow of the room air sucked from the exhaust air suction port 16, flows through the exhaust side bypass air passage 50 of the exhaust side non-heat exchange air passage 101 and passes through the heat exchanger 2. This allows normal ventilation without heat exchange between the supply and exhaust streams. Normal ventilation is non-heat exchange ventilation, which is ventilation without heat exchange between the supply air stream and the exhaust air stream.

Inside the casing 5, at a part where the exhaust air passage 32 and the exhaust-side bypass air passage 50 diverge, there is provided a switch for switching between the air passage passing through the heat exchanger 2 in the exhaust air passage 32 and the exhaust-side bypass air passage 50. An electric first air path switching damper 51 is provided as a damper. The first air passage switching damper 51 can be rephrased as a damper for switching between the exhaust air passage 32 and the exhaust side non-heat exchange air passage 101 .

The first air passage switching damper 51 has a rotating shaft at a branch point between the exhaust air passage 32 and the exhaust side bypass air passage 50, and whether or not the room air sucked from the exhaust air suction port 16 passes through the heat exchanger 2. , to switch between the exhaust air passage 32 and the exhaust-side bypass air passage 50. The first air passage switching damper 51 is made of, for example, a plate that rotates inside the upstream exhaust air passage 32a, and can switch between the exhaust air passage 32 and the exhaust side bypass air passage 50 by changing the direction. The operation of the first air path switching damper 51 is controlled by the controller 35 .

FIG. 3 shows a state in which the first air passage switching damper 51 is arranged at the closed position for closing the exhaust-side bypass air passage 50 and the exhaust air passage through which the exhaust flow passes is switched to the exhaust air passage 32 . As shown in FIG. 3, when the first air passage switching damper 51 is arranged at the closed position, the air passage from the upstream side exhaust air passage 32a to the heat exchanger 2 is opened, thereby closing the exhaust air passage. 32 is opened, and the exhaust side bypass air passage 50 and the exhaust side non-heat exchange air passage 101 are closed. As a result, the exhaust flow flows from the upstream exhaust air passage 32a through the heat exchanger 2 to the downstream exhaust air passage 32b. A heat exchange ventilation operation can be performed in which heat is exchanged between.

FIG. 4 shows a state in which the first air passage switching damper 51 is placed at the open position where the exhaust side bypass air passage 50 is opened, and the exhaust air passage through which the exhaust flow passes is switched to the exhaust side non-heat exchange air passage 101. showing. As shown in FIG. 4, when the first air passage switching damper 51 is arranged at the open position, the air passage from the upstream side exhaust air passage 32a to the heat exchanger 2 is blocked, thereby opening the exhaust air passage. 32 is closed, and the exhaust side bypass air passage 50 and the exhaust side non-heat exchange air passage 101 are opened. As a result, the exhaust flow flows from the upstream exhaust air passage 32 a to the downstream exhaust air passage 32 b without passing through the heat exchanger 2 . It is possible to perform normal ventilation operation, which is a non-heat exchange ventilation operation in which heat is not exchanged between

In the normal ventilation operation, the exhaust flow bypasses the heat exchanger 2 and flows from the upstream side exhaust air passage 32a to the downstream side exhaust air passage 32b, and bypass ventilation operation in which the indoor air is exhausted to the outside without passing through the heat exchanger 2. can be rephrased.

The heat exchange ventilator 1 has two operation modes, the heat exchange ventilation operation and the normal ventilation operation described above, and the operation mode is appropriately selected by the user using a remote controller 36, which will be described later.

5 is a block diagram of a functional configuration related to control of the heat exchange ventilator according to the first embodiment; FIG. The heat exchange type ventilator 1 includes a controller 35 attached to the outside of the casing 5 and a remote controller 36 installed indoors. The control unit 35 and the remote controller 36 are capable of two-way communication with each other.

The control unit 35 controls the operation of the heat exchange ventilator 1 as a whole. The control unit 35 controls the operation of the heat exchange ventilator 1 by controlling the operations of the supply air blower 11 and the exhaust air blower 12 . The control unit 35 controls the operation of the heat exchange ventilator 1 based on the control signal received by the remote controller 36 and transmitted from the remote controller 36 to instruct the operation of the heat exchange ventilator 1 . In addition, the control unit 35 controls the operation of the heat exchange ventilator 1 based on information that instructs the operation preset in the control unit 35 .

The control unit 35 also includes a damper control unit 351 that controls the operation of the first air path switching damper 51 . The damper control section 351 can be said to be a first control section that controls the operation of the first air path switching damper 51 . The damper control unit 351 has a closed position that closes the exhaust-side bypass air passage 50 and the exhaust-side non-heat exchange air passage 101, and an open position that opens the exhaust-side bypass air passage 50 and the exhaust-side non-heat exchange air passage 101. By switching the position of the first air path switching damper 51 to one of the positions, the exhaust air path through which the exhaust flow passes is switched to either the exhaust air path 32 or the exhaust side non-heat exchange air path 101. Perform control to switch to the air path. That is, the damper control section 351 has a function as an air passage switching control section. The damper control unit 351 switches the position of the first air path switching damper 51 based on the control signal transmitted from the remote controller 36 .

Further, when the damper control unit 351 receives the control signal and the control signal includes an instruction signal instructing to stop the operation of both the supply air blower 11 and the exhaust air blower 12, the damper control unit 351 controls the exhaust side bypass wind. Control is performed to open the passage 50 and the exhaust side non-heat exchange air passage 101 and close the exhaust air passage 32 . That is, when the received control signal includes an instruction signal instructing to stop the operation of both the supply air blower 11 and the exhaust air blower 12, the damper control unit 351 operates the first air path switching damper 51. Perform control to place in the open position. Then, the damper control unit 351 performs control to hold the first air path switching damper 51 at the open position until the exhaust air blower 12 is operated.

The control signal including the instruction signal instructing to stop the operation of both the supply air blower 11 and the exhaust air blower 12 includes a stop instruction signal instructing to stop the operation of the heat exchange ventilator 1 .

Next, the operation of the heat exchange type ventilator 1 will be described. 6 is a flowchart of a control procedure of a control unit when the heat exchange ventilator according to the first embodiment stops; FIG. FIG. 7 is a conceptual diagram showing the position of the first air path switching damper when the heat exchange type ventilator according to the first embodiment is stopped.

In step S<b>10 , the control section 35 receives the control signal transmitted from the remote controller 36 .

In step S20, the control unit 35 determines whether both the stop signal for the supply air blower 11 that instructs to stop the operation of the supply air blower 11 and the stop signal for the exhaust air blower 12 that instructs to stop the operation of the exhaust air blower 12 are It is determined whether or not it is included in the received control signal. When both the stop signal for the supply air blower 11 and the stop signal for the exhaust air blower 12 are included in the received control signal, the control unit 35 instructs to stop the operation of the heat exchange ventilator 1 in step S10. This is the case when a stop instruction signal is received.

If both the stop signal for the supply air blower 11 and the stop signal for the exhaust air blower 12 are included in the received control signal, the determination in step S20 is Yes, and the process proceeds to step S30. If at least one of the stop signal for the supply air blower 11 and the stop signal for the exhaust air blower 12 is not included in the received control signal, the determination in step S20 is No, and the process returns to step S10.

In step S<b>30 , the control unit 35 performs control to open the exhaust-side bypass air passage 50 . Specifically, the control unit 35 stops the supply air blower 11 and the exhaust air blower 12 . Then, the damper control unit 351 arranges the first air passage switching damper 51 at the open position where the exhaust side bypass air passage 50 and the exhaust side non-heat exchange air passage 101 are opened as shown in FIG. Control is performed to open the bypass air passage 50 and the exhaust side non-heat exchange air passage 101 . That is, when the operation of the heat exchange ventilator 1 is stopped, the position of the first air path switching damper 51 is set to the open position.

The damper control unit 351 performs heat exchange regardless of whether the operation mode of the heat exchange ventilation device 1 immediately before stopping the operation of the heat exchange ventilation device 1 is either the heat exchange ventilation operation or the bypass ventilation operation. When the operation of the type ventilator 1 is stopped, the position of the first air path switching damper 51 is set to the open position. Therefore, the damper control unit 351 changes the position of the first air path switching damper 51 when the heat exchange ventilation system 1 is performing the heat exchange ventilation operation immediately before the operation of the heat exchange ventilation system 1 is stopped. Switch from the closed position to the open position. If the heat exchange ventilator 1 was performing the bypass ventilation operation immediately before stopping the operation of the heat exchange ventilator 1, the damper control unit 351 changes the position of the first air path switching damper 51 to the open position. maintain.

The timing at which the damper control unit 351 switches the position of the first air passage switching damper 51 from the closed position to the open position may be the timing at which the control unit 35 receives the stop instruction signal. It may be after a predetermined period of time has passed.

In step S40, the damper control unit 351 keeps the exhaust-side bypass air passage 50 open. Specifically, the damper control unit 351 performs control to hold the first air path switching damper 51 at the open position until both the supply air blower 11 and the exhaust air blower 12 are operated and the heat exchange type ventilator 1 is operated. to keep the exhaust-side bypass air passage 50 and the exhaust-side non-heat exchange air passage 101 open.

In step S50, the control unit 35 determines whether or not a control signal transmitted from the remote controller 36 has been received. If it is determined that the control signal transmitted from the remote controller 36 has been received, it becomes Yes in step S50 and proceeds to step S60. If it is determined that the control signal transmitted from the remote controller 36 has not been received, the result in step S50 is No, and the process returns to step S40.

In step S<b>60 , the control unit 35 performs control corresponding to the received control signal to start the operation of the heat exchange ventilator 1 .

In step S40 described above, the damper control unit 351 keeps the first air path switching damper 51 at the open position until both the supply air blower 11 and the exhaust air blower 12 are operated and the heat exchange type ventilator 1 is operated. However, it is not limited to this. At least when the control unit 35 operates the exhaust air blower 12 according to the control signal, the damper control unit 351 cancels the maintenance of the open state of the exhaust-side bypass air passage 50 and switches the first air passage switching damper 51. The position may be controlled to a position corresponding to the content of the received control signal. That is, the damper control section 351 may hold the first air path switching damper 51 at the open position until the exhaust air blower 12 is operated.

As described above, when the heat exchange ventilator 1 is stopped, the first air passage switching damper 51 is set to the open position, and the exhaust side bypass air passage 50 and the exhaust side non-heat exchange air passage are operated. Open 101. As a result, outside air that flows into the heat exchange ventilator 1 through the exhaust outlet 14 when the heat exchange ventilator 1 is stopped passes through the exhaust side bypass air passage 50 and does not pass through the heat exchanger 2 . Therefore, even when fog is generated or the outside air is in a high humidity state, the outside air flowing into the heat exchange type ventilator 1 through the exhaust outlet 14 is condensed in the heat exchanger 2. and the water contained in the outside air does not condense in the heat exchanger 2. As a result, the heat exchange type ventilator 1 can reduce unnecessary water retention in the heat exchanger 2 caused by outside air, and can reduce deterioration of the heat exchanger 2 due to unnecessary water retention.

Since the exhaust-side bypass air passage 50 and the exhaust-side non-heat exchange air passage 101 are air passages in which the air flow does not pass through the heat exchanger 2, the exhaust air passage 32 is an air passage in which the air flow passes through the heat exchanger 2. pressure loss can be reduced. For this reason, even if negative pressure is constantly generated in the room due to the operation of other ventilation devices such as a local ventilation device provided in the room where the heat exchange type ventilation device 1 is the space to be ventilated, heat exchange While the type ventilator 1 is stopped, outside air easily flows into the room through the exhaust side non-heat exchange air passage 101 . As a result, while the heat exchange type ventilator 1 is stopped, the pressure difference between the indoor and the outdoor can be reduced, and the door becomes difficult to open due to the negative pressure in the room. Also, it is possible to reduce drafts caused by the negative pressure in the room. That is, the exhaust-side bypass air passage 50 can function as a pass duct that supplies outside air into the room to reduce the negative pressure in the room.

That is, the heat exchange type ventilator 1 switches the first air passage switching damper 51 so that the exhaust air passage 32 becomes the exhaust side non-heat exchange air passage 101 when the heat exchange type ventilation device 1 is stopped. It is possible to secure an air passage that does not pass through the As a result, when the heat exchange type ventilator 1 is stopped, the outside air is introduced into the room through the exhaust side non-heat exchange air passage 101 by the negative pressure in the room, thereby suppressing deterioration of the heat exchanger 2 due to unintended inflow of outside air. In addition, the negative pressure in the room can be reduced.

Therefore, the heat exchange type ventilator 1 according to the first embodiment allows the outside air to flow into the room from the air passage that does not pass through the heat exchanger 2 even if the pressure in the room is a negative pressure environment while it is stopped. This makes it possible to prevent the heat exchanger 2 from deteriorating and to reduce the negative pressure environment in the room when the system is stopped.

On the other hand, if the position of the first air passage switching damper 51 is set to the closed position and the exhaust air passage 32 is opened when the heat exchange ventilator 1 is stopped, the exhaust blower is closed when the heat exchange ventilator 1 is stopped. Outside air that has flowed into the heat exchange ventilator 1 through the outlet 14 passes through the heat exchanger 2 . Therefore, when fog is generated or the outside air is in a high humidity state, the outside air flowing into the heat exchange type ventilator 1 through the exhaust outlet 14 is condensed in the heat exchanger 2 .

As described above, deterioration of the heat exchanger 2 due to inflow of outside air during shutdown can be suppressed without adding air supply equipment such as a ventilation fan or a pass duct to the room as a countermeasure against negative pressure in the room during shutdown. .

Embodiment 2.
In Embodiment 1, the case where the bypass air passage that bypasses the heat exchanger 2 is provided on the exhaust air passage 32 side has been described, but the bypass air passage may be provided on the supply air passage 31 side. .

FIG. 8 is a conceptual diagram showing the position of the second air path switching damper when the heat exchange ventilator according to the second embodiment is stopped. A heat exchange type ventilator 60 according to the second embodiment has an intake side bypass air path 61 and a second air path switching damper 62 instead of the exhaust side bypass air path 50 and the first air path switching damper 51. Except for this, the configuration is the same as that of the heat exchange ventilator 1 according to the first embodiment.

Inside the casing 5 of the heat exchange type ventilator 60 according to the second embodiment, an air passage passing through the heat exchanger 2 in the air supply air passage 31, which is a heat exchange air passage, bypasses the heat exchanger 2. A supply-side bypass air passage 61 is formed as a bypass air passage for air supply. The air supply side bypass air passage 61 is an air passage that bypasses the heat exchanger 2 and connects the upstream side air supply air passage 31a and the downstream side air supply air passage 31b. 15 is a bypass air passage for flowing the supply air flow. The air supply side bypass air passage 61 is a non-heat exchange air passage that does not pass through the heat exchanger 2 . Then, the upstream supply air passage 31a on the upstream side of the heat exchanger 2 and the downstream air supply passage 31b on the downstream side of the heat exchanger 2 do not pass through the heat exchanger 2, and the air supply side bypass air passage 61 is formed. An air supply side non-heat exchange air passage 102 connected by is formed inside the casing 5 .

The heat exchange type ventilator 60 flows the supply airflow, which is the airflow of the outside air sucked from the supply air suction port 13, through the supply airflow path 31, which is the heat exchange supply airflow path, and passes it through the heat exchanger 2, thereby Heat exchange ventilation can be performed with heat exchange with the exhaust stream. On the other hand, the heat exchange type ventilator 60 allows the supply airflow, which is the airflow of outside air sucked from the supply air intake port 13, to the supply side non-heat exchange air passage 102, which is a non-heat exchange air passage, to flow into the heat exchanger 2. By not passing through, normal ventilation, which is non-heat exchange ventilation without heat exchange between the supply air flow and the exhaust air flow, can be performed.

Inside the casing 5, the air passage passing through the heat exchanger 2 in the air supply air passage 31 and the air supply side bypass air passage 61 are switched at a branching portion of the air supply air passage 31 and the air supply side bypass air passage 61. An electric second air path switching damper 62 is provided as a damper for the air flow. The second air passage switching damper 62 can be rephrased as a damper for switching between the supply air passage 31 and the air supply side non-heat exchange air passage 102 .

The second air passage switching damper 62 has a rotating shaft at the branch point between the air supply air passage 31 and the air supply side bypass air passage 61, and passes outside air sucked from the air supply suction port 13 to the heat exchanger 2. It constitutes an air passage switching unit that switches between the air supply air passage 31 and the air supply side bypass air passage 61 by switching whether or not. The second air passage switching damper 62 is made of, for example, a plate that rotates inside the upstream air supply air passage 31a, and can switch between the air supply air passage 31 and the air supply side bypass air passage 61 by changing the direction. . The operation of the second air path switching damper 62 is controlled by the damper control section 351 .

In FIG. 8, the second air path switching damper 62 arranged at the open position is indicated by a solid line, and the second air path switching damper 62 arranged at the closed position is indicated by a broken line.

As indicated by the solid line in FIG. 8, when the second air passage switching damper 62 is placed in the open position to open the air supply side bypass air passage 61 and the air supply side non-heat exchange air passage 102, the air supply flow is The supply air passage is switched to the air supply side non-heat exchange air passage 102 . In this case, since the air passage from the upstream side air supply air passage 31a to the heat exchanger 2 is blocked, the air supply passage 31 is closed, and the air supply side bypass air passage 61 and the air supply side non-heat exchange air passage 102 are opened. be done. As a result, the supply airflow flows from the upstream supply airflow path 31 a to the downstream supply airflow path 31b without passing through the heat exchanger 2 . It is possible to perform normal ventilation operation without heat exchange between

8, when the second air passage switching damper 62 is arranged in the closing position for closing the air supply side bypass air passage 61 and the air supply side non-heat exchange air passage 102, the supply air flow is The air supply air path to pass is switched to the air supply air path 31. - 特許庁In this case, since the air path from the upstream air supply air path 31a to the heat exchanger 2 is opened, the air supply air path 31 is opened, and the air supply side bypass air path 61 and the air supply side non-heat exchange air path 102 are closed. be done. As a result, the supply airflow flows from the upstream supply airflow path 31a through the heat exchanger 2 to the downstream supply airflow path 31b. A heat exchange ventilation operation can be performed in which heat is exchanged between.

The control unit 35 performs the process of controlling the second air path switching damper 62 instead of the first air path switching damper 51 in the process described with reference to FIG. 6 in the first embodiment. That is, the control unit 35 stops the supply air blower 11 and the exhaust blower 12 when both the stop signal for the supply air blower 11 and the stop signal for the exhaust blower 12 are included in the received control signal. . When the control signal includes an instruction signal for instructing to stop the operation of both the supply air blower 11 and the exhaust air blower 12, the damper control unit 351 controls the air supply side bypass air passage 61 and the air supply side bypass air path 61. Control is performed to open the heat exchange air passage 102 .

That is, when the received control signal includes an instruction signal instructing to stop the operation of both the supply air blower 11 and the exhaust air blower 12, the damper control unit 351 operates the second air path switching damper 62. The position is controlled to be placed at the open position where the air supply side bypass air passage 61 and the air supply side non-heat exchange air passage 102 are opened. Then, the damper control unit 351 performs control to hold the second air path switching damper 62 at the open position until the exhaust air blower 12 is operated. The damper controller 351 can be said to be a second controller that controls the operation of the second air path switching damper 62 .

Note that, at least when the control unit 35 causes the supply air blower 11 to operate according to the control signal, the damper control unit 351 cancels the maintenance of the open state of the supply side bypass air passage 61 and switches the second air passage. The position of the damper 62 may be controlled to a position corresponding to the content of the received control signal. That is, the damper control section 351 may hold the second air path switching damper 62 at the open position until the supply air blower 11 is operated.

As described above, when the heat exchange ventilator 60 is stopped, the second air passage switching damper 62 is set to the open position, and the air supply side bypass air passage 61 and the air supply side non-heat exchange air passage 61 are opened. The air passage 102 is opened. As a result, when the heat exchange ventilator 60 is stopped, the outside air that has flowed into the heat exchange ventilator 60 through the air supply inlet 13 passes through the air supply side bypass air passage 61 and the heat exchanger 2. do not have. Therefore, even when fog is generated or the outside air is in a high humidity state, the outside air flowing into the heat exchange type ventilator 60 through the supply air inlet 13 is condensed in the heat exchanger 2. Therefore, the water contained in the outside air does not condense in the heat exchanger 2. As a result, the heat exchange type ventilator 60 can reduce unnecessary water retention in the heat exchanger 2 caused by outside air, and can reduce deterioration of the heat exchanger 2 due to unnecessary water retention.

In addition, since the air supply side bypass air path 61 and the air supply side non-heat exchange air path 102 are air paths in which the air flow does not pass through the heat exchanger 2, the air supply air path in which the air flow passes through the heat exchanger 2 Pressure loss can be reduced compared to the passage 31 . For this reason, even if negative pressure is constantly generated in the room due to the operation of other ventilation devices such as a local ventilation device provided in the room where the heat exchange type ventilation device 60 is the space to be ventilated, heat exchange While the type ventilator 60 is stopped, outside air easily flows into the room through the air supply side non-heat exchange air passage 102 . As a result, while the heat exchange type ventilator 60 is stopped, the pressure difference between the indoor and the outdoor can be reduced, and the door becomes difficult to open due to the negative pressure in the room. Also, it is possible to reduce drafts caused by the negative pressure in the room. That is, the air supply side bypass air passage 61 can function as a pass duct that supplies outside air into the room to reduce the negative pressure in the room.

As described above, according to the heat exchange ventilator 60 according to the second embodiment, the same effects as those of the heat exchange ventilator 1 according to the first embodiment can be obtained.

Embodiment 3.
FIG. 9 is a conceptual diagram showing the positions of the first air path switching damper and the second air path switching damper when the heat exchange type ventilator according to the third embodiment is stopped. A bypass air passage that bypasses the heat exchanger 2 may be provided on the exhaust air passage 32 side and the supply air passage 31 side. A heat exchange ventilator 70 according to the third embodiment shown in FIG. 9 has a configuration in which the heat exchange ventilator 1 according to the first embodiment and the heat exchange ventilator 60 according to the second embodiment are combined. have.

In the case of the heat exchange ventilator 70 according to the third embodiment, outside air that flows into the heat exchange ventilator 70 when the heat exchange ventilator 70 is stopped does not pass through the heat exchanger 2 . That is, when the heat exchange ventilator 70 is stopped, the outside air that flows into the heat exchange ventilator 70 through the exhaust air outlet 14 passes through the exhaust side non-heat exchange air passage 101 and does not pass through the heat exchanger 2. . In addition, when the heat exchange type ventilator 70 is stopped, the outside air that flows into the heat exchange type ventilator 70 through the supply air inlet 13 passes through the supply side non-heat exchange air passage 102 and passes through the heat exchanger 2. don't pass Therefore, the heat exchange ventilator 70 according to the third embodiment has the same effect as the heat exchange ventilator 1 according to the first embodiment. And compared to the heat exchange type ventilator 60 according to the second embodiment, it becomes larger.

Embodiment 4.
FIG. 10 is a conceptual diagram showing an image of the air flow when the heat exchange ventilator according to the fourth embodiment is stopped. FIG. 11 is a conceptual diagram showing an image of airflow during operation of the heat exchange ventilator according to the fourth embodiment. The heat exchange ventilator 80 according to the fourth embodiment has the configuration of the heat exchange ventilator 1 according to the first embodiment described above, and the exhaust air passage 32 upstream of the heat exchanger 2. A bypass air passage that connects the upstream exhaust air passage 32a and the downstream exhaust air passage 32b, which is the exhaust air passage 32 on the downstream side of the heat exchanger 2, without passing through the heat exchanger 2 is provided outside the casing 5. may be provided. The heat exchange type ventilator 80 includes an external bypass air passage that bypasses the heat exchanger 2 outside the casing 5 and is installed in the air passage passing through the heat exchanger 2 in the exhaust air passage 32, and heat exchange in the exhaust air passage 32. and an air passage switching shutter for switching between the air passage passing through the device 2 and the external bypass air passage.

The heat exchange type ventilator 80 has a bypass duct 81 that communicates and connects the upstream exhaust air passage 32a and the downstream exhaust air passage 32b. A bypass duct 81 is an external bypass air passage. A bypass duct 81 is provided to be connected to the top plate 3 . The downstream exhaust air passage 32b is provided with a shutter 82 capable of closing the downstream exhaust air passage 32b below the exhaust outlet 14 in the vertical direction. The shutter 82 is an air path switching shutter.

During operation of the heat exchange ventilator 80, the shutter 82 is flipped vertically upward by the dynamic pressure of the exhaust flow generated by the exhaust blower 12 as shown in FIG. 14 is opened.

On the other hand, the shutter 82 closes the downstream exhaust air passage 32b below the exhaust outlet 14 as shown in FIG. The air passage from the outlet 14 to the heat exchanger 2 is closed to close the exhaust air passage 32. - 特許庁The shutter 82 is configured to block the downstream exhaust air passage 32b below the exhaust outlet 14 by its own weight or the biasing force of a spring. As a result, the upstream exhaust air passage 32 a on the upstream side of the heat exchanger 2 and the downstream exhaust air passage 32 b on the downstream side of the heat exchanger 2 are connected by the bypass duct 81 without passing through the heat exchanger 2 . An external non-heat exchange air passage 103 is formed inside the casing 5 as a non-heat exchange air passage. Then, when the heat exchange type ventilator 80 is stopped, the outside air that has flowed into the downstream exhaust air passage 32b through the exhaust outlet 14 flows through the bypass duct 81 into the upstream exhaust air passage 32a, and flows through the exhaust air inlet 16. Since it flows into the room, it does not pass through the heat exchanger 2.

Therefore, according to the heat exchange ventilator 80 according to the fourth embodiment, the same effect as the heat exchange ventilator 1 according to the first embodiment described above can be obtained.

By providing the above-mentioned bypass duct 81 and shutter 82, even in a heat exchange ventilation system that does not have a function to switch between heat exchange ventilation and non-heat exchange ventilation, as a countermeasure against negative pressure in the room when stopped, Deterioration of the heat exchanger due to inflow of outside air during shutdown can be suppressed without the need for additional air supply equipment such as a ventilation fan or a pass duct.

12 is a first diagram illustrating an example of a hardware configuration of a control unit included in the heat exchange ventilator according to the first embodiment; FIG. FIG. 12 shows a hardware configuration when the functions of the control unit 35 are realized using dedicated hardware. The control unit 35 includes a processing circuit 41 that executes various processes, and an interface 42 that is an interface for connecting the control unit 35 to external devices.

The processing circuit 41, which is dedicated hardware, is a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or any of these It's a combination. Each function of the control unit 35 is implemented using the processing circuit 41 . The interface 42 outputs control signals to the supply air blower 11 , the exhaust air blower 12 , the first air path switching damper 51 and the second air path switching damper 62 .

13 is a second diagram illustrating an example of a hardware configuration of a control unit included in the heat exchange ventilator according to the first embodiment; FIG. FIG. 13 shows a hardware configuration when the functions of the control unit 35 are implemented using hardware that executes programs. The control unit 35 has a processor 43 , a memory 44 and an interface 42 .

The processor 43 is a CPU (Central Processing Unit). The processor 43 may be a processing device, an arithmetic device, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor). Each function of the control unit 35 is implemented by the processor 43, software, firmware, or a combination of software and firmware. Software or firmware is written as a program and stored in memory 44, which is an internal memory. The memory 44 is a nonvolatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), or EEPROM (Electrically Erasable Memory). Programmable Read Only Memory).

The configurations shown in the above embodiments are only examples, and can be combined with other known techniques, or can be combined with other embodiments, without departing from the scope of the invention. It is also possible to omit or change part of the configuration.

Reference Signs List 1, 60, 70, 80 heat exchange type ventilator 2 heat exchanger 3 top plate 4 bottom plate 5 casing 6 maintenance cover 7 supply air blower casing 8 exhaust air blower casing 9 control unit 11 air supply Blower 12 Exhaust air blower 13 Air supply inlet 14 Exhaust air outlet 15 Air supply outlet 16 Exhaust air inlet 17, 18 Partition wall 21, 22, 23, 24 Guide rail 31 Air supply air passage 31a upstream side air supply air passage 31b downstream side air supply air passage 31c heat exchanger internal air supply air passage 32 exhaust air passage 32a upstream exhaust air passage 32b downstream exhaust air passage 32c heat exchanger internal exhaust air passage 35 control unit 36 remote controller 41 processing circuit 42 interface 43 processor 44 memory 50 exhaust side bypass air passage 51 first air passage switching damper 61 air supply side bypass air passage 62 second air passage Switching damper 81 Bypass duct 82 Shutter 101 Exhaust side non-heat exchange air passage 102 Air supply side non-heat exchange air passage 103 External side non-heat exchange air passage 351 Damper controller.

Claims (5)

a casing in which an exhaust air passage for exhausting indoor air to the outside and a supply air passage for supplying outdoor air to the room are independently formed;
an exhaust fan that is provided in the exhaust air passage and generates an exhaust flow that flows through the exhaust air passage;
an air supply blower that is provided in the air supply airflow path and generates an airflow flowing through the air supply airflow path;
a heat exchanger provided across the supply airflow path and the exhaust airflow path for exchanging heat between the supply airflow and the exhaust airflow;
a bypass air passage that bypasses the heat exchanger and is installed alongside an air passage passing through the heat exchanger in at least one of the exhaust air passage and the supply air passage;
an air path switching damper for switching between the air path passing through the heat exchanger and the bypass air path;
a control unit that controls the operation of the exhaust fan, the operation of the supply air fan, and the operation of the air path switching damper;
with
The control unit arranges the air path switching damper in an open position for opening the bypass air path in a state where the supply air fan and the exhaust air fan are stopped;
A heat exchange type ventilation device characterized by: The air passage switching damper is provided in parallel with air passages passing through the heat exchanger in both the exhaust air passage and the supply air passage;
The heat exchange type ventilator according to claim 1, characterized by: The control unit holds the air path switching damper, which is provided in the air path passing through the heat exchanger in the exhaust air path, in the open position until the exhaust air blower is operated;
The heat exchange type ventilator according to claim 1 or 2, characterized by: The control unit holds the air path switching damper, which is provided along an air path passing through the heat exchanger in the air supply air path, in the open position until the air supply blower is operated;
The heat exchange type ventilator according to any one of claims 1 to 3, characterized by: an external bypass air passage that is installed alongside the air passage passing through the heat exchanger in the exhaust air passage and bypasses the heat exchanger outside the casing;
an air passage switching shutter that switches between an air passage passing through the heat exchanger in the exhaust air passage and the external bypass air passage;
with
the air passage switching shutter is moved to an open position for opening the external bypass air passage when the exhaust fan is stopped;
The heat exchange type ventilator according to any one of claims 1 to 4, characterized by:

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