JP5538298B2 - Heat exchange ventilator - Google Patents

Description

  The present invention relates to a ventilator that performs heat exchange between air supply and exhaust while simultaneously performing air supply and exhaust, and in particular, air is directly taken into the equipment body from the room without using a duct, and the duct. The present invention relates to a heat exchange ventilator that exhausts air to the outside through a duct and supplies air taken into the device body from the outside through a duct to the room through the duct.

  Conventionally, in order to ventilate the entire house in a well-balanced manner, an exhaust air passage for exhausting indoor air to the outside and an air supply air passage for supplying outdoor air to the room are provided. A heat exchange ventilator that performs ventilation while performing heat exchange is installed behind the ceiling. In such a heat exchange ventilator, due to simplification of duct piping work and resistance to providing an inspection port, air from the room is taken directly through the duct without going through the equipment body duct etc. There is a ventilator that exhausts air from the outside and supplies the air taken into the device body through the duct into the room through the duct.

  In general, in ceiling cassette type heat exchange ventilators for homes that require a small external shape, low cost, and no need for an inspection port, due to space limitations, For the purpose of reducing the outer shape, there are a large number of motors operating both the supply side and the exhaust side using both shaft motors.

  For example, as in Patent Document 1, there is a fan in which a supply-side blower and an exhaust-side blower are driven by a single motor, the supply-side blower is upstream of the heat exchanger, and the exhaust-side blower is a heat exchanger. It is arranged downstream. In this arrangement, the space before the heat exchanger in the air supply side air passage is in a positive pressure state, while the space in front of the heat exchanger in the exhaust air passage is in a negative pressure state, and the relative pressure difference between the two spaces is Becomes larger. For this reason, it is easy to lead to air leakage from the air supply side air passage to the exhaust side air passage, and many parts for sealing are required around the heat exchanger. In addition, due to restrictions on the external dimensions of the main body, the air flow from the blower fan casing on the air supply side to the heat exchanger cannot be so far away from the heat exchanger. The amount of air passing through the place directly hit by the wind is large, and the amount of air passing through other places is reduced. As a result, the amount of heat exchange between the supply air and the exhaust gas becomes small. In addition, since the air blower on the supply side is located close to the room, there is a problem that the noise is easily transmitted to the room.

  On the other hand, similarly, Patent Document 2 is a ceiling cassette type heat exchange ventilator in which an air supply side fan and an exhaust side fan are driven by a single motor, but both the air supply side fan and the exhaust side fan are Located downstream of the heat exchanger. By arranging the supply-side blower and the exhaust-side blower in this way, the relative pressure difference around the heat exchanger is increased and the uneven wind speed distribution of the heat exchanger is eliminated. In order to place both the exhaust fan and the exhaust fan on the downstream side of the heat exchanger, the exhaust air passage is placed on the side of the heat exchanger. This arrangement is used to provide an outside air inlet that connects the main unit and the outside and an exhaust outlet to the outside on the same surface of the main unit, but this limits the length of the heat exchanger. In addition, the air path on the exhaust side becomes a very narrow structure. As a result, there is a problem that the amount of heat exchange between the exhaust and the supply air decreases, and the pressure loss inside the main body increases. Further, since the air supply side blower is located close to the room, noise is easily transmitted to the room as in Patent Document 1.

Japanese Patent No. 4456326 Japanese Patent No. 3979341

  In the heat exchange ventilator, in addition to having a heat exchanger inside the main body, in order to take in air from the outside and supply air to the room and exhaust from the room through the duct, a general duct It is operated in a state where the pressure loss inside the machine and the pressure loss outside the machine are much higher than the ventilation fan, and the blower fan is forced to rotate at high speed. In such a situation, it becomes necessary to operate the blower at a high speed in order to satisfy the target air volume.

  In addition, in the ceiling cassette type heat exchange ventilator having an opening for taking in air from the room on the lower surface of the main body, since the position of the blower fan and the motor is close to the opening, noise during operation etc. Compared to a concealed heat exchange ventilator, which has a high possibility of propagating into and entering the room, and the main body completely enters the attic, and does not take air directly into or into the main body from inside the room. Becomes higher.

  Also, in the heat exchange ventilator, one air flow is caused by the relationship between the uneven flow of air to the heat exchanger and the pressure balance between the supply air flow path and the exhaust air flow path around the heat exchanger, which is a high pressure loss. There are many cases where a blower is installed downstream of a heat exchanger in order to prevent it from leaking into the road, but when using a drive motor with both shafts, both the supply side and the exhaust side are heat exchangers. In order to provide a blower downstream, the air path becomes necessary and complicated, which increases the internal pressure loss.

  When the drive motors for both shafts are used, the amount of air supplied by the air supply blower is affected not only by the pressure loss due to the air supply side duct piping but also due to the pressure loss of the exhaust side duct piping. On the other hand, the amount of exhaust air flow from the exhaust fan affects not only the pressure loss due to the duct pipe on the exhaust side but also the pressure loss of the duct pipe on the air supply side. As described above, when the drive motors of both shafts are used, the air flow characteristics disclosed as general product information are that the supply air side and the exhaust side are both in the rated pressure loss state, and either duct When the piping is different from the reference, there is an aspect that it is very difficult to predict the air volume during operation from the reference characteristics.

  In addition, the importance of ventilation in houses has increased, and the method of measuring the effective ventilation rate has been implemented under harsh conditions. The demand for things is also high.

  The present invention has been made in view of the above, and significantly reduces the noise level without increasing the body size and without increasing the manufacturing cost as compared with the conventional ceiling cassette type heat exchange ventilator. In addition, the pressure loss in the air path on the supply side and exhaust side is reduced, the capacity of the blower fan is increased, the ventilation air volume and static pressure are increased, and the ventilation air path design on the supply side and exhaust side The purpose is to obtain a ceiling-cassette type heat exchange ventilator that is easy to use.

  In order to solve the above-described problems and achieve the object, the present invention is installed on the back of the ceiling, performs heat exchange between indoor air taken from the room and outdoor air taken from the outside, and after heat exchange Is a heat exchange ventilator that discharges indoor air to the outside and supplies the outdoor air after heat exchange to the room, a heat exchanger that exchanges heat between the indoor air and the outdoor air, and the indoor air to the room An exhaust fan having an exhaust fan that generates an exhaust air flow that is taken in and exhausted after heat exchange, and an exhaust fan that drives the exhaust fan, and a supply air that takes outdoor air from the outdoors and supplies it to the room after heat exchange An air supply fan that has an air supply fan that generates an air flow, and an air supply drive motor that is different from the exhaust drive motor that drives the air supply fan, a heat exchanger, an exhaust air blower, and an air supply air blower are mounted. Mounting points for heat exchangers The exhaust air blower has an indoor air intake provided immediately below the exhaust air duct and an exhaust duct connection port connected to an exhaust duct that is provided adjacent to the mounting location of the exhaust air blower and guides the exhaust to the outside. A box-shaped main body in which indoor air taken in from the indoor air inlet passes vertically through the heat exchanger and passes through the exhaust fan and reaches the exhaust duct connection port, It is characterized by providing.

  According to the present invention, while maintaining the characteristics of a conventional ceiling cassette type heat exchange ventilator that is small and inexpensive and does not require an inspection port, noise is reduced and a large air volume and a high static pressure are simultaneously achieved. This achieves the effect of reducing the manufacturing cost by reducing the size of the driving motor as compared with the case of using the dual-axis driving motor.

FIG. 1 is a cross-sectional view showing a configuration of an embodiment of a heat exchange ventilator according to the present invention. FIG. 2 is a side view of the heat exchange ventilator on the outdoor side. FIG. 3 is a side view of the indoor side of the heat exchange ventilator. FIG. 4 is a bottom view of the heat exchange ventilator. FIG. 5 is a diagram showing an exhaust air passage. FIG. 6 is a diagram illustrating an air supply path. FIG. 7 is a diagram showing the configuration of the heat exchanger box. FIG. 8 is a diagram showing a secondary return air passage provided in the supply air passage box. In FIG. 9, the supply-side fan and the exhaust-side fan share a double-shaft motor, and both the supply-side fan and the exhaust-side fan are installed on the downstream side of the heat exchanger. It is a figure which shows the structure of an apparatus. FIG. 10 shows a ceiling cassette in which a supply-side fan and an exhaust-side fan share a dual-axis motor, and the supply-side fan is installed upstream of the heat exchanger and the exhaust-side fan is installed downstream of the heat exchanger. It is a figure which shows the structure of a type | mold heat exchange ventilation apparatus.

  Embodiments of a heat exchange ventilator according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a cross-sectional view showing a configuration of an embodiment of a heat exchange ventilator according to the present invention. FIG. 2 is a side view of the heat exchange ventilator on the outdoor side. FIG. 3 is a side view of the indoor side of the heat exchange ventilator. The main body 1 is installed behind the ceiling surface 2 of the building, and the state where only the design panel 3 is exposed to the room is a normal installation state. As shown in FIGS. 2 and 3, the main body 1 is fixed to an anchor bolt 5 hung on the back of the ceiling by a ceiling hanging bracket 4 provided on the outer shell of the main body 1 or the main body 1. This is done by fixing the field edge mounting flange 7 of one outer sheet metal 6 to a field edge dedicated to the upper part of the ceiling material.

  FIG. 4 is a bottom view of the heat exchange ventilator. As shown in FIGS. 2 and 4, the exhaust duct 10 is connected to the exhaust duct connection port 8 on one side of the main body 1, and the supply duct 11 is connected to the supply duct connection port 9. Then, air is exhausted from the outer wall 12 of the building to the outside, and air is supplied to the room through the air supply duct 11. As shown in FIGS. 3 and 4, the main body 1 has an indoor air supply duct for distributing air into the room on the side opposite to the side where the exhaust duct connection port 8 and the air supply duct connection port 9 are provided. The connection port 13 is provided, and fresh air taken from the outside is supplied to the living room space through the indoor air supply duct 14 connected to the indoor air supply duct connection port 13.

  Further, a side of the main body 1 on which the indoor air supply duct connection port 13 is provided is provided with a secondary return air duct connection port 33 for exhausting locally without passing through the heat exchanger 18. The room air can be taken into the main body 1 from other than the design panel opening 35 provided in the design panel 3 on the lower surface.

  When the indoor air supply duct connection port 13 and the auxiliary return air duct connection port 33 are not used, they are sealed using a cap 34 as shown in FIG. 4 so that the outflow and inflow of wind can be prevented. It has become.

  As shown in FIG. 2, the power supply to the main body 1 is drawn from the power line inlet 16 on the side of the main body 1 into the main body 1 and connected to the circuit box in the main body 1. To do.

  As shown in FIG. 1, inside the main body 1, an exhaust fan 22 formed by an exhaust drive motor 19, an exhaust fan 20, and an exhaust fan casing 21, an air supply drive motor 23, and an air supply fan 24. And an air supply fan 26 formed by the air supply fan casing 25 and a heat exchanger 18 for exchanging heat between the exhaust and the air supply. The exhaust drive motor 19 is attached to the outer sheet metal 6 that forms the outer shell of the main body 1 with the motor drive shaft facing downward.

  FIG. 7 is a diagram showing a configuration of the heat exchanger box 28. The heat exchanger box 28 is made of foamed plastic (for example, styrofoam) so as to form most of the exhaust side air passage and part of the air supply side air passage, and is used for holding the heat exchanger 18. A heat exchanger holding frame 29 is provided. Further, the heat exchanger box 28 is an integral part having a function as an air passage from the exhaust fan casing orifice 30 for sucking air of the exhaust fan casing 21 constituting the exhaust blower 22 to the exhaust fan casing outlet 31. The exhaust fan 20 is positioned on the projection surface of the heat exchanger 18 by the heat exchanger box 28. With such a structure, the length of the air passage can be shortened, the number of times the air passage can be bent can be reduced, and the pressure loss in the machine can be reduced. Furthermore, the heat exchanger box 28 is configured to include an air supply dust filter housing 47.

  The air supply blower 26 shown in FIG. 1 has a function for distributing the supply air pushed out from the blower to one or more routes, and the supply air contacts the outer sheet metal 6 of the main body 1 so that the ambient air of the main body 1 is cooled. Foamed plastic (such as foamed polystyrene or foam) that has heat insulation to prevent condensation and airtightness to prevent the air supply blower 26 from inhaling air other than the air supply from the outside. The air supply drive motor 23 is mounted on the motor base 32 with the drive shaft facing downward, and the air supply air flow box 27 is the main body. 1, the air supply drive motor 23 is located above the main body 1.

  The air supply blower 26 arranged in the air supply air box 27 is inserted in a state where the air supply drive motor 23, the motor base 32, the air supply fan 24, and the air supply fan casing 25 are assembled before being put in the box. It has a structure. Further, the supply air duct box 27 also has a function of the auxiliary return air duct connection port 33 and its air path, and is taken into the main body 1 from the auxiliary return air duct 43 connected to the auxiliary return air duct connection port 33. The air that has been discharged flows into the exhaust blower 22 without passing through the heat exchanger 18.

  An exhaust dust removal filter 37 is provided in the design panel opening 35 of the design panel 3 provided on the lower surface of the main body 1 shown in FIG. 1, and dust is removed before the room air is taken into the main body 1. The exhaust dust removal filter 37 is a part integrally formed with a net filter independent of the design panel 3 and can be cleaned by a vacuum cleaner. Further, the exhaust dust removal filter 37 is configured to open from the design panel 3 with one side in the longitudinal direction as a support portion with one touch. The air supply that enters the main body 1 through the air supply duct 11 from outside is heated by the air supply insect removing filter 38 and the air supply dust removing filter 39 provided immediately after the air supply duct connection port 9 and immediately before the heat exchanger 18. Dust is removed before entering the exchanger 18.

  The air supply insect removing filter 38 and the air supply dust removing filter 39 can be used for cleaning and maintenance by removing the air supply filter access plate 40 which is a foamed plastic part that serves both as airtightness and heat insulation while the exhaust dust removal filter 37 is opened. It can be accessed from time to time.

  The exhaust air passage will be described. FIG. 5 is a diagram showing an exhaust air passage. The room air is discharged to the outside like the exhaust air passage 44. The exhaust passes through an exhaust dust filter 37 provided in a design panel opening 35 which is a part of the design panel 3 provided on the lower surface of the main body 1, and then an under plate provided on the under plate 41 on the lower surface of the main body 1. The air is sucked into the main body 1 through the opening 42. The exhaust sucked into the main body 1 is sucked into the heat exchanger 18 held by the heat exchanger box 28 to exchange heat with the supply air, and passes through the heat exchanger 18 vertically upward. Immediately after that, the air is sucked into the exhaust blower 26 arranged above, discharged in the direction of the exhaust duct connection port 8, and discharged to the outdoors.

  The exhaust fan 20 is reduced in thickness because the height of the main body 1 is limited, and the exhaust fan casing outlet 31 is immediately connected to the exhaust duct connection port 8 in order to reduce the in-machine pressure loss. ing. Further, by fixing the exhaust drive motor 19 to the outer sheet metal 6, the overall height of the main body 1 does not become higher than that of the conventional structure (in other words, only the installation location of the exhaust drive motor 19 is partially increased). It can be installed without touching the building constraints. At this time, the heat exchanger 18, the design panel 3, and the exhaust dust removal filter 37 upstream of the exhaust blower 26 are all in a negative pressure state.

  The air supply path will be described. FIG. 6 is a diagram illustrating an air supply path. Outdoor air is supplied into the room like an air supply air passage 45. Fresh outdoor air is taken into the main body 1 from the outside through the air supply duct 11 and the air supply duct connection port 9. After the outdoor air taken into the main body 1 is dust-removed by the air supply insect removing filter 38 and the air supply dust removing filter 39, it enters the heat exchanger 18 and is supplied with heat after being exchanged with the exhaust gas. The air enters the air duct box 27, is sucked into the air supply blower 26, and is sent to the indoor air supply duct connection port 13 and the indoor air supply duct 14. Since the air supply fan casing 25 is immediately connected to the indoor air supply duct connection port 13, the in-machine pressure loss is kept small. The air supply path 45 is configured in a form along the ceiling surface so that outdoor air is supplied to each room. At this time, the heat exchanger 18, the air supply insect removing filter 38, and the air supply dust removing filter 39 upstream of the air supply blower 26 are all in a negative pressure state, and the exhaust air path around the heat exchanger 18 is The possibility of leakage due to the relative pressure difference with the supply air passage is reduced.

  FIG. 8 is a view showing the auxiliary return air passage 46 provided in the supply air passage box 27. The exhaust gas taken in from the auxiliary return air duct connection port 33 provided in the supply air duct box 27 flows in the direction opposite to the supply air, and exchanges heat through the joint portion between the heat exchanger box 28 and the supply air duct box 27. It enters into the heat exchanger box 28, and does not pass through the heat exchanger 18, but is sucked into the exhaust air blower 22 that is a part of the heat exchanger box 28 and exhausted to the outdoors.

  Thus, in the present embodiment, since none of the exhaust air passage 44, the supply air passage 45, and the auxiliary return air passage 46 passes through the heat exchanger 18, the heat exchanger 18 has a lateral width of the main body 1. And the heat exchange efficiency can be increased.

  For comparison, a conventional ceiling cassette type heat exchange ventilator will be described. In FIG. 9, the supply air blower 51 and the exhaust air blower 52 share the double shaft motor 53, and both the air supply air blower 51 and the exhaust air blower 52 are installed downstream of the heat exchanger 54. It is a figure which shows the structure of a ceiling cassette type heat exchange ventilation apparatus. The air supply side path takes in air into the main body from the outside air intake 55 on the side of the main body via the outside air intake duct 56, passes through the heat exchanger 54, and then passes through the heat exchanger 54 to supply the indoor air supply duct on the side of the main body. The air is supplied to the indoor air supply duct 58 connected to the connection port 57. The exhaust path takes in indoor air from a suction port provided in the design panel 59 on the lower surface of the main body, passes through the heat exchanger 54 vertically upward, and is pushed out by the exhaust side blower 52 and provided on the side surface of the heat exchanger 54. It has an air path configuration for sending air to the exhaust duct 61 connected to the exhaust duct connection port 60 on the side surface of the main body through the exhaust air path.

  In such an air path configuration, since the exhaust air path passes through the side surface of the heat exchanger, the length of the heat exchanger cannot be taken much and the heat exchange amount is reduced. Further, since the air passage downstream of the exhaust fan is narrow and long, the pressure loss inside the main body increases.

  In FIG. 10, the supply air blower 51 and the exhaust air blower 52 share the double shaft motor 53, and the supply air blower 51 is upstream of the heat exchanger 54, and the exhaust air blower 52 is the heat exchanger 54. It is a figure which shows the structure of the ceiling cassette type heat exchange ventilator installed downstream. The air supply side path takes in the air supply from the external air inlet 55 on the side surface of the main body through the external air intake duct 56, is pushed out by the air supply side blower 51, passes through the heat exchanger 54, and then passes through the heat exchanger 54. The air is supplied to the indoor air supply duct 58 connected to the indoor air supply duct connection port 57. The exhaust air passage takes in exhaust gas from a suction port provided in the design panel 59 on the lower surface of the main body, passes through the heat exchanger 54 obliquely upward, is pushed out by the exhaust side blower 52, and enters the exhaust duct connection port 60 on the side surface of the main body. It has an air passage structure that blows air to the attached exhaust duct 61.

  In such an air path configuration, the front side of the heat exchanger on the air supply side is in a positive pressure state, whereas the front and rear sides of the heat exchanger on the exhaust side are in a negative pressure state, and the relative pressure difference increases. This may increase the leakage around the heat exchanger, and may increase the bias of the wind speed distribution of the air blown from the air supply side blower to the heat exchanger, leading to a decrease in heat exchange efficiency. Cause.

  Furthermore, in any of the configurations shown in FIGS. 9 and 10, it is necessary to dispose the blower at a position close to the room in the main body installation state, and a large fan fan is installed due to the restriction of the main body height. Is difficult.

  As described above, when using a double-axis motor, the double-axis motor is placed in the center of the main body in the height direction due to the height restriction of the main body, and the air supply side and exhaust side blowers are installed above and below it. The blower installed on the lower side of both shaft motors is located close to the room and has a drawback that noise easily propagates into the room, but in this embodiment, the motors are separated on the air supply side and the exhaust side. Thus, it becomes possible to install the motor and the blower on the air supply side and the exhaust side at locations away from the room on the upper side in the main body installation state, and noise can be reduced.

  Furthermore, by attaching the motor to the main body outer sheet metal and taking out the back surface of the motor from the main body, the noise caused by the motor is released not into the room but into the ceiling pocket, thereby reducing the noise propagating into the room.

  In addition, by making the drive motor independent between the supply side blower and the exhaust side blower, both the supply side blower and the exhaust side blower can be installed downstream of the heat exchanger, and the supply side wind around the heat exchanger The relative pressure difference between the air passage and the exhaust side air passage can be reduced, and the width of the heat exchanger can be expanded to the full width of the main body, and the air passage on the air supply side and the exhaust side can be configured simply. Since the capacity of the fan to be used can be increased, the number of rotations of the blowing fan during operation can be reduced to reduce noise and increase the air volume and static pressure at the same time.

  In addition, two motors for driving the blower are required, but when using a double-axis motor for driving, rotational torque is required to satisfy the required air volume for both supply and exhaust. Compared to the field, separate drive motors can reduce the pressure loss inside the main unit, and it is possible to use a single-axis motor that is smaller than both-axis drive motors. Can be reduced.

  In addition, when using a dual-axis drive motor, it is difficult to predict the operating point of the exhaust-side fan and the supply-side fan due to the pressure loss configuration of the supply-side duct and the exhaust-side duct. This is one of the causes of further increase in noise. However, the optimal motor design is achieved by separating the motor on the air supply side and the exhaust side. Is possible.

  A ceiling that takes indoor air into the main body from the opening under the main body, exhausts it outside through a duct, takes outside air into the main body via the air supply duct from the outside, and supplies air to each room using the indoor air supply duct When the cassette-type heat exchange ventilator is configured to operate the supply fan and the exhaust fan using the dual-axis motor (the configuration shown in FIGS. 9 and 10), the supply fan and the exhaust fan are the same. Number of revolutions. In the product of this form, the pipe pressure loss in the air supply path from the outdoor to the indoor becomes larger than the pipe pressure loss in the exhaust path from the indoor to the outdoor. There is a tendency to become overbalanced and unbalanced. Therefore, it is necessary to reduce the capacity of the fan in order to suppress the output (air volume) of the exhaust fan. In order to obtain the same target air volume, it is necessary to increase the rotation speed as the blades are smaller. Therefore, in the configuration using the dual-axis motor, it is difficult to take the basic method of reducing the rotation speed in order to reduce noise. On the other hand, if the exhaust drive motor 19 and the air supply drive motor 23 are separately provided as in the present embodiment, the capacity of the exhaust fan 20 to reduce the fan rotation speed can be increased. Yes.

  In the double-shaft motor structure, an exhaust fan and an air supply fan having a thickness corresponding to half of the product height can be used, whereas in this embodiment, the heat exchanger 18 is directly below the exhaust fan 20. Therefore, in order to ensure a sufficient amount of heat exchange, the height dimension of the space where the exhaust fan 20 can be installed is reduced. Therefore, in order to configure the large capacity exhaust fan 20, it is necessary to reduce the thickness and increase the fan diameter.

  From these points, in the present embodiment, the exhaust fan 20 is made thinner and larger in diameter when compared with a heat exchange ventilator using a double-axis motor.

  Thus, according to the present embodiment, noise can be reduced while maintaining the characteristics of the conventional ceiling cassette type heat exchange ventilator that is small and inexpensive and does not require an inspection port. Moreover, the capacity | capacitance of a ventilation fan can be raised and large air volume and high static pressure can be achieved simultaneously. Furthermore, the drive motor can be reduced in size compared with the case where a dual-axis drive motor is used, and the manufacturing cost can be reduced.

DESCRIPTION OF SYMBOLS 1 Main body 2 Ceiling surface 3 Design panel 4 Ceiling hanger 5 Anchor bolt 6 Outer sheet metal 7 Edge mounting flange 8 Exhaust duct connection port 9 Air supply duct connection port 10 Exhaust duct 11 Supply air duct 12 Outer wall 13 Indoor supply air duct connection port DESCRIPTION OF SYMBOLS 14 Indoor air supply duct 16 Power supply line inlet 17 Power supply cable 18 Heat exchanger 19 Exhaust drive motor 20 Exhaust fan 21 Exhaust fan casing 22 Exhaust blower 23 Supply air drive motor 24 Supply fan 25 Supply fan casing 26 Supply fan 27 Supply air duct box 28 Heat exchanger box 29 Heat exchanger holding frame 30 Exhaust fan casing orifice 31 Exhaust fan casing outlet 32 Motor base 33 Sub return air duct connection port 34 Cap 35 Design panel opening 37 Exhaust dust filter 38 Exhaust dust removing filter Filter 39 Supply air Dust removal filter 40 Air supply filter access plate 41 Under plate 42 Under plate opening 43 Sub return air duct 44 Exhaust air passage 45 Air supply air passage 46 Sub return air air passage 47 Supply air dust removal filter storage section

Claims (6)

Heat exchange is performed between the indoor air taken in from the room and the outdoor air taken from outside the room, and the indoor air after the heat exchange is exhausted to the outside of the room. A heat exchange ventilator for supplying indoors,
A heat exchanger for performing heat exchange between the indoor air and the outdoor air;
An exhaust fan having an exhaust fan that takes in the indoor air from the room and generates an exhaust air flow that is exhausted to the outside after the heat exchange; and an exhaust drive motor that drives the exhaust fan;
An air supply fan that takes in the outdoor air from outside and generates an air flow of supply air that is supplied to the room after the heat exchange, and an air supply drive motor that is different from the exhaust drive motor that drives the air supply fan An air supply blower having,
The heat exchanger, the exhaust blower and the air supply blower are mounted, the under plate opening provided immediately below the mounting location of the heat exchanger and the exhaust blower provided adjacent to the mounting location of the exhaust blower An exhaust duct connection port to which an exhaust duct that leads to the outside is connected, and the exhaust blower is disposed immediately above the heat exchanger, and the indoor air taken in from the opening of the under plate faces the heat exchanger vertically upward A box-shaped main body in which an exhaust air passage that passes through the exhaust fan and reaches the exhaust duct connection port is formed inside;
A design panel installed on the lower side of the main body so as to be exposed indoors;
Equipped with a,
The design panel is provided with an indoor air intake at a location shifted from directly under the underplate opening,
The heat exchange ventilator characterized in that an exhaust air passage from the indoor air intake port to the under plate opening is formed in a gap between the lower surface of the main body and the design panel .   The exhaust blower and the air supply blower are installed at a position above the center in the height direction of the main body with the drive shafts of the exhaust drive motor and the air supply drive motor vertically downward. The heat exchange ventilator according to claim 1. Each of the exhaust air blower and the air supply blower is downstream of the heat exchanger in the exhaust air path and the air supply air path, immediately before the exhaust outlet of the exhaust and the air supply from the main body. Installed in
The heat exchange ventilator according to claim 1 or 2, wherein the heat exchanger has substantially the same width as the inner width of the main body.   The heat exchange ventilator according to any one of claims 1 to 3, wherein the exhaust blower is installed with the exhaust drive motor protruding upward from the main body.   The heat according to any one of claims 1 to 4, wherein a part for holding the heat exchanger and a fan casing of the exhaust blower are integrally formed of a material having airtightness and heat insulation. Exchange ventilation device. On the lower surface of the main body, an air supply filter access plate that separates the air supply air passage outside the heat exchanger from the exhaust air passage is installed at a position directly above the indoor air intake port. 6. The air supply filter for removing foreign matter from air passing through the air supply air passage is disposed above the air supply filter access plate in the air supply air passage. The heat exchange ventilator according to the paragraph.

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