CN108662708B

CN108662708B - Fan and heat exchanger with bypass function

Info

Publication number: CN108662708B
Application number: CN201710674491.1A
Authority: CN
Inventors: 李承秀
Original assignee: Headwind
Current assignee: Headwind
Priority date: 2017-03-31
Filing date: 2017-08-09
Publication date: 2020-07-07
Anticipated expiration: 2037-08-09
Also published as: CN108662708A; KR101841953B1

Abstract

The invention relates to a fan with bypass function and a heat exchanger, the invention comprises: a fan housing having an air inlet and an air outlet; an impeller disposed inside the fan housing and generating an air flow in which air is drawn into an air inlet and discharged to an exhaust port by rotation; an impeller driving motor which rotates the impeller; a bypass hole disposed in the fan housing to be adjacent to the exhaust port of the fan housing; and a rheological damper which is disposed in the fan housing, opens and closes the bypass hole, forms a ventilation passage for discharging air sucked into the air inlet to the air outlet in a state where the bypass hole is closed, and forms a bypass passage for communicating the bypass hole and the air outlet while blocking the ventilation passage in a state where the bypass hole is opened. Therefore, the present invention not only reduces the volume, but also minimizes the flow resistance to the bypass, and prevents the counter electromotive force from being generated in the motor when the indoor air flows through the bypass.

Description

Fan and heat exchanger with bypass function

Technical Field

The invention relates to a fan with a bypass function and a heat exchanger with the fan.

Background

Generally, in a state where the interior of a building cannot be ventilated well to the outside, if a person moves in the room for a long time, the interior cannot be kept in a comfortable state because of indoor air pollution and a high CO2 concentration, and therefore ventilation of the interior is required. If the window is opened for ventilation, not only the pollutants but also internal heat loss occurs. The device for solving the problem is a ventilation system with a heat exchanger.

The ventilation system includes: a heat exchanger disposed in the building; an air inlet pipeline which is arranged in the building for connecting with the indoor of the building and is connected with the heat exchanger; an exhaust line disposed inside the building for connection to the interior of the building and connected to the heat exchanger. The heat exchanger has a heat exchanger (also referred to as a heat exchange element) inside, and exchanges heat between indoor air, which is air discharged from the indoor to the outdoor, and outdoor air, which is air introduced from the outdoor into the indoor, through the heat exchange element, thereby ventilating the indoor while minimizing heat loss.

On the other hand, since the heat exchanger is provided with the bypass device, the outdoor air and the indoor air do not pass through the heat exchange element but directly ventilate the indoor air in spring or autumn when the difference between the indoor temperature and the outdoor temperature is small. In addition, in case of smoke occurring in the room, the bypass device may rapidly discharge the smoke in the room to the outside.

Korean registered patent No. 10-1540034 (2015.07.28, bulletin) (hereinafter, referred to as prior art 1) discloses the following technology: a bypass duct 300 is provided above the

housings

110 and 120 in which the heat exchange element 200 is disposed, and the indoor air is discharged to the outside of the room through the bypass duct without passing through the heat exchange element 200. However, the prior art 1 is that the bypass pipe is disposed at the upper side of the housing, and thus not only increases the volume but also occupies a large installation space. Further, since the indoor air is discharged through the bypass duct provided outside the casing, there is a problem in that flow resistance is large and power consumption is large.

Korean registered patent No. 10-1703672 (2017.02.08, publication date) (hereinafter, referred to as prior art 2) discloses the following technology: the heat exchange element 40 is provided inside the main body 10, and the bypass valve 50 is disposed between the air supply fan 20 for allowing outdoor air to enter the room and the air discharge fan 30 for discharging indoor air to the outside, and in case that the indoor air is bypassed without passing through the heat exchange element 40 when being discharged to the outside, the air supply fan 20 is stopped in a state where the bypass valve 50 is opened and only the air discharge fan 30 is started, and the indoor air is discharged to the outside through the air supply fan 20, the bypass valve 50 and the air discharge fan 30.

However, with the prior art 2, since the bypass passage is disposed inside the main body, the result is simple and the volume is small, but there are disadvantages as follows: the indoor air passes through the supply fan 20 when being discharged to the outdoor through the bypass, whereby the supply fan 20 is rotated in reverse due to the flow of the air, so that a counter electromotive force occurs at the fan motor of the supply fan 20, and thus there is a risk of the fan motor being burned out, and a power loss occurs due to a large air flow resistance.

Disclosure of Invention

(problem to be solved)

The invention aims to provide a fan with a bypass function and a heat exchanger, wherein the fan is small in size and can reduce bypass flow resistance to the maximum extent.

Another object of the present invention is to provide a fan and a heat exchanger having a bypass function for preventing a fan motor from being damaged when indoor air flows through a bypass.

(means for solving the problems)

In order to achieve the object of the present invention, there is provided a fan having a bypass function, including: a fan housing having an air inlet and an air outlet; an impeller disposed inside the fan housing and generating an air flow in which air is drawn into an air inlet and discharged to an outlet by rotation; an impeller driving motor which rotates the impeller; a bypass hole disposed in the fan housing to be adjacent to the exhaust port of the fan housing; and a rheological damper disposed in the fan housing to open and close the bypass hole, forming a ventilation passage for discharging air sucked into the air inlet to the air outlet in a state where the bypass hole is closed, and forming a bypass passage for closing the ventilation passage and communicating the bypass hole and the air outlet in a state where the bypass hole is opened.

In addition, there is provided a heat exchanger comprising: a housing having an indoor air supply port and an indoor air discharge port disposed at one side thereof, an outdoor air supply port and an outdoor air discharge port disposed at the other side thereof, and an exhaust passage for discharging indoor air to the outside of the housing and an intake passage for allowing outdoor air to enter the housing; a heat exchange element installed inside the case and heat-exchanging indoor air and outdoor air; an exhaust fan disposed in the exhaust passage so as to be adjacent to the outdoor side exhaust port, and generating exhaust flow; a blower for supplying air; an air inlet channel arranged adjacent to the indoor air supply port to generate air inlet flow; a bypass damper disposed between the exhaust fan and the air supply fan to open and close the exhaust passage and the intake passage; wherein the air supply fan is the fan with bypass function of claim 1.

Drawings

Fig. 1 is a perspective view illustrating an embodiment of a fan having a bypass function according to the present invention.

Fig. 2 is a side sectional view showing an embodiment of a fan having a bypass function according to the present invention.

Fig. 3 is a front view illustrating an embodiment of a fan having a bypass function according to the present invention.

Fig. 4 is a front view showing a rheological damper constituting an embodiment of a fan with a bypass function according to the present invention.

Fig. 5 and 6 are side sectional views each showing an operation state of an embodiment of the fan with the bypass function according to the present invention.

Fig. 7 is a plan sectional view showing an embodiment of a heat exchanger having a fan with a bypass function according to the present invention.

Fig. 8 is a side sectional view showing an exhaust fan constituting an embodiment of a heat exchanger according to the present invention.

Fig. 9 is a side sectional view showing a blower for air supply constituting an embodiment of a heat exchanger according to the present invention.

Fig. 10 is a plan sectional view showing a general operation state of an embodiment of a heat exchanger of a fan having a bypass function according to the present invention.

Fig. 11 is a plan sectional view illustrating a bypass operation state of an embodiment of a heat exchanger of a fan having a bypass function according to the present invention.

Detailed description of the invention

Hereinafter, embodiments of a fan having a bypass function and a heat exchanger having the same according to the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a perspective view illustrating an embodiment of a fan having a bypass function according to the present invention. Fig. 2 is a side sectional view showing an embodiment of a fan having a bypass function according to the present invention. Fig. 3 is a front view illustrating an embodiment of a fan having a bypass function according to the present invention.

As shown in fig. 1, 2 and 3, an embodiment of the fan with bypass function according to the present invention includes: fan housing 100, impeller 200, impeller drive motor 300, bypass hole BH, rheological damper 400.

The fan case 100 includes: a main body 110 having an air inlet 112 on a side surface thereof and an impeller 200 provided therein; a discharge duct portion 120 which is formed to extend at one side of the main body portion 110 and discharges air introduced into the air inlet 112 by rotation of the impeller 200. The main body 110 includes: two side circular plates 111 arranged at intervals; circular air inlets 112 respectively arranged at the two side circular plates; and a side cylindrical body 114 surrounding the outer peripheral surfaces of the two side circular plates 111. The discharge pipe part 120 is formed in a quadrangular cylindrical shape in which a side cylindrical body 114 of the body part 110 is extended and protruded, and further communicated with the body part 110, and the discharge port 121 are formed in a quadrangular hole shape. The lower surface of the discharge pipe portion 120 is referred to as a lower surface LF, the upper surface (a surface facing each other below) is referred to as an upper surface UF, and both side surfaces connecting the upper surface UF and the lower surface LF are referred to as side surfaces. That is, with reference to fig. 2, a side close to the center horizontal plane C passing through the center of the main body 110 is a lower surface LF, and a side far from the center horizontal plane C is an upper surface UF.

The impeller 200 is disposed inside the fan housing 100 and generates a flow of air, which enters the air inlet 112 and is discharged to the air outlet 121, by being rotated. The impeller 200 includes: a ring-shaped center plate 210 having a uniform thickness and forming a ring shape; and a plurality of blades 220 formed at both side surfaces of the ring-shaped center plate 210 with a predetermined distance therebetween to form a circular shape, respectively. The blades 220 of the impeller 200 are arranged in radial directions (i.e., central directions of the impeller 200), respectively. The impeller 200 is rotatably positioned inside the main body portion 110 of the fan housing 100.

The impeller driving motor 300 rotates the impeller 200. The impeller driving motor 300 is preferably an outer rotor type motor. The outer rotor of the impeller-driving motor 300 is coupled to the ring-shaped center plate 210 of the impeller 200, and the motor body of the impeller-driving motor 300 is fixed to the body portion 110 of the fan housing 100 by a coupling frame (not shown). The impeller 200 is rotated by the rotation of the outer rotor.

The bypass hole BH is disposed in the fan casing 100 and adjacent to the exhaust port 121 of the fan casing 100. Specifically, the bypass hole BH is formed by the upper surface UF of the discharge duct portion 120 of the fan casing 100 and a part of the side cylindrical body 114 of the body portion 110. The bypass hole BH may be formed only on the upper face UF of the discharge duct portion 120 of the fan casing 100. The bypass hole BH is preferably formed in a quadrangle shape.

The rheological damper 400 is disposed in the fan case 100, opens and closes the bypass hole BH, forms a ventilation passage for discharging air entering the air inlet 112 to the air outlet 121 in a state where the bypass hole BH is closed, and forms a bypass passage for blocking the ventilation passage and communicating the bypass hole BH with the air outlet 121 in a state where the bypass hole BH is opened. As shown in fig. 4, a rheological damper 400 is illustrated, the rheological damper 400 comprising: a damper plate 410 for opening and closing the bypass hole BH while forming an air passage or a bypass passage; a damper motor 420 rotating the damping plate 410. When the bypass hole BH is formed by the upper surface of the discharge duct portion 120 of the fan casing 100 and a part of the side cylindrical body of the main body portion 110, the damper plate 410 includes a curved plate portion 411 forming a curved surface and a linear plate portion 412 extending from the curved plate portion 411 to form a linear surface. In the case where the damping plate includes the curved plate portion, the flow resistance of the air flowing in the bypass passage can be reduced. On the other hand, in the case where the bypass hole BH is formed only on the upper surface of the discharge duct portion 120 of the fan casing 100, the damper plate 410 is formed as a straight plate. The damping plate 410 includes a rigid plate portion made of a rigid material that is not bent, and a flexible plate portion that is formed extending from a frame of the rigid plate portion and is made of a flexible material. The flexible plate portion is preferably formed extending on the remaining three sides except for the connecting portion of the rigid plate portion. Preferably, the rigid material is plastic, and the flexible material includes rubber, silicon, resin, or the like. A hinge shaft 413 is disposed at one side of the damping plate 410, the hinge shaft 413 is rotatably coupled to one side of the bypass hole BH, and the side coupled to the hinge shaft 413 is a side away from the air outlet 121. The rigid plate portion of the damping plate 410 is formed to have the same or a corresponding size as the bypass hole BH, and the flexible plate portion is larger in size than the bypass hole BH. In a state where the damper plate 410 blocks the bypass hole BH, the flexible plate portion contacts the frame of the bypass hole BH to seal the bypass hole BH. The damper motor 420 is installed at one side of the fan housing 100 and connected with the hinge shaft 413.

Hereinafter, the operation and effect of the fan having the bypass function according to the present invention will be described as follows.

First, as shown in fig. 5, when an air flow occurs, the impeller driving motor 300 is activated to rotate the impeller 200 in a state where the damping plate 410 of the flow damper 400 blocks the bypass hole BH. A pressure difference between the inside and the outside of the fan housing 100 is generated according to the rotation of the impeller 200, thereby sucking air through the air inlet 112 of the fan housing 100, and then discharging the air through the exhaust port 121 via the impeller 200 and the discharge duct part 120 of the main body part 110. Then, as shown in fig. 6, when the damper motor 420 of the rheological damper 400 is started to rotate the damper plate 410 in a state where the impeller driving motor 300 is stopped, one end side (the side opposite to the rotation axis of the damper plate) of the damper plate 410 is contacted and supported by the lower surface of the discharge duct part 120 of the fan casing 100 and is positioned at the discharge duct part 120 in an inclined manner while the damper plate 410 is rotated. Therefore, the discharge pipe portion 120 is blocked while forming the bypass passage F in which the bypass hole BH communicates with the exhaust port 121. That is, the bypass passage F is formed by a portion of the discharge pipe part 120 and the damping plate 410, and one side end of the bypass passage F is provided with the bypass hole BH and the opposite side end is provided with the exhaust port 121. Air can be made to flow through the bypass passage F. As shown in fig. 5, when the damper motor 420 is started to rotate the damper plate 410, the damper plate 410 rotates and contacts the inner surface of the discharge pipe portion 120 to close the bypass hole BH and open the discharge pipe portion 120, thereby forming a ventilation passage for discharging air sucked into the intake port 112 to the exhaust port 121.

As shown in fig. 7, an embodiment of a heat exchanger of a blower with a bypass function according to the present invention includes a housing 500, a heat exchange element 600, a blower Q1 for exhaust, a blower Q2 for air supply, and a bypass damper 700, wherein the blower Q2 for air supply is a blower with a bypass function.

The casing 500 has an indoor air supply port 531 and an indoor air discharge port 532 on one side, an outdoor air supply port 541 and an outdoor air discharge port 542 on the other side, and an intake passage P1 for introducing outdoor air into the room and an exhaust passage P2 for introducing indoor air to the outside of the room inside the casing 500. There is illustrated a housing 500, the housing 500 comprising: front, rear, left and

right side plates

510, 520, 530, 540 connected to each other to form a quadrangle; and upper and lower side plates (not labeled with figure symbols) covering the upper and lower ends of the front, rear, left and right side plates to form an internal space. The front, rear, left, and right positions of the housing 500 are set with reference to fig. 7 for convenience of explanation. The left side plate 530 has an indoor air supply port 531 and an indoor air exhaust port 532, and the right side plate 540 has an outdoor air supply port 541 and an outdoor air exhaust port 542. The indoor side exhaust port 531 and the outdoor side exhaust port 542 are disposed facing each other, and the indoor side exhaust port 532 and the outdoor side air supply port 541 are disposed facing each other. The intake passage P1 communicates between the indoor air supply port 531 of the left side plate 530 and the outdoor air supply port 541 of the right side plate 540, and the exhaust passage P2 communicates between the indoor exhaust port 532 of the left side plate 530 and the outdoor exhaust port 542 of the right side plate 540.

The heat exchange member 600 is installed inside the case 500 and heat-exchanges indoor air and outdoor air.

The heat exchange element 600 is installed inside the casing 500, and is connected to the intake passage P1 and the exhaust passage P2, respectively, to exchange heat between outdoor air introduced into the intake passage P1 and indoor air discharged to the exhaust passage P2. The heat exchange member 600 has a hexahedral shape and is positioned inside the case 500 such that four corners of the heat exchange member 600 are positioned at middle portions of the front, rear, left and

right side plates

510, 520, 530 and 540 of the case 500, respectively. Partition walls W are disposed at intermediate portions of the front, rear, left, and

right side plates

510, 520, 530, and 540, and the respective corners of the heat exchange element 600 are supported by the partition walls W. The heat exchange element 600 is located inside the case 500, and thus has four partitioned spaces inside the case 500. A first partitioned space S1 is a partitioned space communicated with the indoor air supply port 531 of the left side plate 530 of the housing 500; the partitioned space communicating with the indoor side exhaust port 532 of the left side plate 530 is a second partitioned space S2; a partitioned space communicating with the outdoor side exhaust port 542 of the right side plate 540 is a third partitioned space S3; the partitioned space communicating with the outdoor air supply port 541 of the right side plate 540 is a fourth partitioned space S4, in which the first and fourth partitioned spaces S1 and S4 provided in the diagonal direction form an air intake passage P1, and the second and third partitioned spaces S2 and S3 provided in the diagonal direction form an air exhaust passage P2.

The exhaust fan Q1 is disposed in the exhaust passage P2 so as to be adjacent to the outdoor side exhaust port 542, and generates exhaust flow. Specifically, the exhaust fan Q1 is disposed inside the casing 500 and is positioned in the third partitioned space S3 communicating with the outdoor side exhaust port 542. As shown in fig. 8, the exhaust fan Q1 includes: a fan housing 100' having an air inlet 112 and an air outlet 121; an impeller 200 disposed inside the fan housing 100' and generating an air flow by rotating, the air being sucked into the air inlet 112 and discharged to the air outlet 121; and an impeller driving motor 300 rotating the impeller 200. The fan casing 100 is provided inside the casing 500 by a fixing tool so that the exhaust port 121 of the exhaust fan Q1 communicates with the outdoor side exhaust port 542.

The supply air fan Q2 is disposed in the intake passage P1 so as to be adjacent to the indoor side air supply port 531, and generates supply air flow. Specifically, the air supply fan Q2 is disposed inside the casing 500 so as to be positioned in the first partitioned space S1 communicating with the indoor-side air supply port 531. The air supply fan Q2 is a fan having a bypass function. That is, as shown in fig. 9, the air supply fan Q2 includes a fan case 100, an impeller 200, an impeller drive motor 300, a bypass hole BH, and a rheological damper 400. The fan casing 100, impeller 200, impeller drive motor 300, bypass hole BH, and rheological damper 400 of the air supply fan Q2 are configured similarly to the fan casing 100, impeller 200, impeller drive motor 300, bypass hole BH, and rheological damper 400 of the fan having the bypass function described above, respectively. Therefore, detailed description is omitted. In order to communicate the fan housing exhaust port 121 of the air supply fan Q2 with the indoor side air supply port 531, the fan housing 100 is provided inside the housing 500 by a fixing tool (not shown).

The bypass damper 700 is disposed between the exhaust fan Q1 and the intake fan Q2 to open and close the intake passage P1 and the exhaust passage P2. Exemplifying the bypass damper 700, the bypass damper 700 comprises: a switch plate 710 that switches the passages communicating the intake passage P1 and the exhaust passage P2; and a damper motor (not shown) that rotates the switching plate 710 so that the switching plate 710 switches the channel. A passage connecting the intake passage P1 and the exhaust passage P2 is formed in a partition wall W between the third partitioned space S3 in which the exhaust fan Q1 is disposed and the first partitioned space S1 in which the air supply fan Q2 is disposed.

Hereinafter, the operation and effect of the heat exchanger of the fan having the bypass function according to the present invention will be described as follows.

The heat exchanger of the fan having the bypass function according to the present invention is provided at a building and ventilates indoor air. At this time, the heat exchanger indoor side air supply port 531 and the exhaust port 532 communicate with the interior of the building, and the outdoor side air supply port 541 and the exhaust port 542 communicate with the exterior of the building.

First, as shown in fig. 10, when ventilating the interior of the building, the air supply fan Q2 and the exhaust fan Q1 are simultaneously activated in a state where the bypass hole BH of the air supply fan Q2 is closed by the damper plate 410 of the rheologic damper 400 and the passage communicating the air intake passage P1 and the exhaust passage P2 is closed by the opening/closing plate 710 of the bypass damper 700. When the exhaust fan Q1 and the intake fan Q2 are activated, respectively, outdoor air enters the interior of the casing 500 through the outdoor air supply port 541, further passes through the heat exchange element 600 while flowing through the intake passage P1, and then enters the room through the indoor air supply port 531 while passing through the intake port 112 and the exhaust port 121 of the intake fan Q2. Meanwhile, the indoor air enters the inside of the casing 500 through the indoor side exhaust port 532, passes through the heat exchange element 600 while flowing through the exhaust passage P2, and is then discharged to the outside of the room through the outdoor side exhaust port 542 while passing through the intake port 112 and the exhaust port 121 of the exhaust fan Q1. At this time, the outdoor air introduced into the intake passage P1 of the case 500 and the indoor air discharged to the exhaust passage P2 exchange heat with each other while passing through the heat exchange element 600, and the heat-exchanged outdoor air is supplied to the indoor to reduce indoor heat loss.

On the other hand, as shown in fig. 11, in the case where a fire breaks out indoors or smoke is generated indoors and it is necessary to discharge the indoor smoke to the outside, the air supply fan Q2 is stopped and only the exhaust fan Q1 is started in a state where the damper plate 410 of the rheologic damper 400 opens the bypass hole BH of the air supply fan Q2 to close the ventilation passage and opens the bypass passage at the same time, and the switch plate 710 of the rheologic damper 700 opens the passage connecting the air intake passage P1 and the exhaust passage P2. When the air supply fan Q2 is stopped and only the exhaust fan Q1 is started, the indoor air enters the interior of the casing 500 through the indoor side air supply port 531, passes through the exhaust port 121 and the bypass hole BH of the air supply fan Q2, and the bypass passage F, and the indoor air passing through the bypass passage F flows through the passage that communicates the intake passage P1 with the exhaust passage P2 without passing through the heat exchange element 600, and is discharged to the outside through the outdoor side exhaust port 542 while passing through the intake port 112 and the exhaust port 121 of the exhaust fan Q1. On the other hand, by activating the exhaust fan Q1, a part of the indoor air enters the casing 500 through the indoor side exhaust port 532, passes through the heat exchange element 600, and is exhausted to the outdoor side exhaust port 542 through the exhaust fan Q1.

As described above, in the case of a fire or smoke in the room, the present invention discharges the smoke in the room through the indoor air supply port 531, the bypass passage F of the air supply fan Q2, the passage communicating the air supply passage P1 and the air discharge passage P2, the air discharge fan Q1, and the outdoor air discharge port 542 of the casing 500, so that the flow resistance of the smoke in the room is small, and the smoke in the room is rapidly discharged to the outside of the room. In particular, the indoor smoke flows through the bypass path F of the air supply fan Q2 without flowing through the exhaust port 121, the impeller 200, and the intake port 112 of the air supply fan Q2, and the flow resistance is greatly reduced. Therefore, exposure of residents in the room to indoor smoke is minimized.

In addition, the present invention has a bypass structure for directly discharging air to the outside without passing through the heat exchange element 600 in the case 500, and thus the heat exchanger has a simple structure and a small volume.

In addition, the fan having the bypass function of the present invention has the bypass hole BH and the rheological damper 400 in the fan housing 100, and further forms the ventilation passage through which the air sucked into the air inlet 112 is discharged to the air outlet 121 in a state where the rheological damper 400 closes the bypass hole BH, and forms the bypass passage F communicating the bypass hole BH and the air outlet 121 in a state where the bypass hole BH is opened, so that when the air is caused to flow through the bypass, the air does not flow through the air outlet 121, the impeller 200, and the air inlet 112 but flows through the bypass passage F, thereby not only reducing the flow resistance of the air but also preventing the reverse rotation of the impeller-driving motor 300 driving the impeller 200, and further preventing the motor from being damaged by the counter electromotive force.

Claims

1. A fan with a bypass function, comprising:

a fan housing having an air inlet and an air outlet;

an impeller disposed inside the fan housing and generating an air flow in which air is drawn into an air inlet and discharged to an outlet by rotation;

an impeller driving motor which rotates the impeller;

a bypass hole disposed in the fan housing to be adjacent to the exhaust port of the fan housing; and

and a rheological damper which is disposed in the fan housing, opens and closes the bypass hole, forms a ventilation passage for discharging air sucked into the air inlet to the air outlet in a state where the bypass hole is closed, and forms a bypass passage for blocking the ventilation passage and communicating the bypass hole and the air outlet in a state where the bypass hole is opened.

2. The fan with bypass function according to claim 1,

the rheological damper includes:

a damping plate which opens and closes the bypass hole while forming a ventilation channel or a bypass channel; and

a damper motor rotating the damping plate.

3. The fan with bypass function according to claim 2,

the damping plate includes:

the curved panel part forms a curved surface so as to reduce flow resistance when air flows; and

and a linear plate portion extending from the curved plate portion to form a linear surface.

4. The fan with bypass function according to claim 2,

the damping plate includes:

a rigid plate portion made of a rigid material that does not bend; and

and a flexible plate portion formed to extend from a frame of the rigid plate portion and made of a flexible material having flexibility.

5. The fan with bypass function according to claim 1,

the fan housing includes:

a main body part having an air inlet on a side surface and having an impeller rotatably disposed therein; and

an exhaust pipe part extended to one side of the main body part to communicate with the main body part and discharging air sucked into the air inlet by rotation of the impeller;

wherein a tip end of the exhaust pipe portion constitutes an exhaust port, and the bypass hole is disposed in the exhaust pipe portion.

6. A heat exchanger, comprising:

a housing having an indoor air supply port and an indoor air discharge port disposed at one side thereof, an outdoor air supply port and an outdoor air discharge port disposed at the other side thereof, and an exhaust passage for discharging indoor air to the outside of the housing and an intake passage for allowing outdoor air to enter the housing;

a heat exchange element installed inside the case and heat-exchanging indoor air and outdoor air;

an exhaust fan disposed in the exhaust passage so as to be adjacent to the outdoor side exhaust port, and generating exhaust flow;

a blower for supplying air; an air inlet channel arranged adjacent to the indoor air supply port to generate air inlet flow; and

a bypass damper disposed between the exhaust fan and the intake fan to open and close the exhaust passage and the intake passage;

wherein, the fan for the air feed includes:

a fan housing having an air inlet and an air outlet;

an impeller disposed inside the fan housing and generating a flow of air that enters the air inlet and is discharged to the discharge port by rotation;

an impeller driving motor which rotates the impeller;

a bypass hole disposed in the fan housing and adjacent to the exhaust port of the fan housing; and

and a rheological damper disposed in the fan case to open and close the bypass hole, forming a ventilation passage for discharging air sucked into the air inlet to the air outlet in a state where the bypass hole is closed, and forming a bypass passage for closing the ventilation passage and communicating the bypass hole and the air outlet in a state where the bypass hole is opened.

7. The heat exchanger of claim 6,

the bypass damper includes:

a switch plate that switches a passage that communicates the exhaust passage and the intake passage; and

a damper motor rotating the switch plate to cause the switch plate to switch the channel.

8. The heat exchanger of claim 6,

the fan housing includes:

a main body part, wherein an air inlet is arranged on the side surface, and an impeller is rotatably arranged in the main body part; and

an exhaust pipe part extended from one side of the main body part to communicate with the main body part, and discharging air sucked into the air inlet by rotation of the impeller;