KR20050001507A - A ventilation system - Google Patents

Abstract

PURPOSE: A ventilating system is provided to realize inflow and outflow of air in various directions by forming air inlets and outlets at upper and lower sides, and sides of a main body case. CONSTITUTION: A main body case(50) is formed in a square box shape for forming an external appearance. An outside air suction port(52) is formed at one side of the main body case to become an inlet for sucking outside air. An outside air supply fan forcibly sends the sucked air into a room. An outside air exhaust port(56) is formed at the other side of the main body case to become an outlet for jetting air sent by the outside air supply fan. An inside air suction port(88) is formed at one side of the main body case to become an inlet for sucking inside air. An inside air exhaust fan sends air passing through the inside air suction port to the outside. An inside air exhaust port(82) is formed at the other side of the main body case to become an outlet for discharging inside air. A heat transfer exchanger(60) exchanges heat between outside air sucked through the outside air suction port and inside air sucked through inside air suction port. Mounting holes(108,110,112,114) are formed at upper and lower sides, and sides of the main body case.

Description

A ventilation system

The present invention relates to a ventilation system, and more particularly to a ventilation system capable of drawing in and out of air in many ways.

In recent years, due to problems such as energy conservation and noise, the residential space of human beings is gradually becoming airtight and insulated. However, the air in these closed spaces gradually changes to carbon dioxide and contaminates over time, thereby inhibiting the breathing of life.

Therefore, a place where many people stay in a narrow space, such as an office or a vehicle, needs to be frequently ventilated. In this case, a ventilation system using an electrothermal exchange method is usually used. This is for supplying external air while maintaining the indoor air temperature, and for exhausting the indoor air.

1 is a perspective view of a conventional ventilation device, a heat exchanger and a prefilter of a conventional ventilation device are shown in FIG. 2, and a cross-sectional view of a conventional ventilation device mounted on a wall of a building is shown in FIG. have.

As shown in the drawing, the outside air inlet 12 is formed on one side of the main body case 10 forming the exterior so as to suck the outside air. A suction duct (not shown) is provided inside the external air inlet 12 to allow the external air sucked from the suction hole 12 to reach the heat exchanger 14 to be described below. ) Is formed to be a passage of external air.

In order to exchange heat between the air sucked from the outside and the air discharged from the outside to the outside, an electrothermal heat exchanger 14 as shown in FIG. 2 is provided at the inner center of the main body case 10. It is configured to have.

The heat exchanger 14 as described above normally exchanges moisture and sensible heat for exchanging latent heat by means of highly efficient heat exchange membranes forming layers of the different flow paths by allowing each air having a temperature difference to pass through different flow paths. Follow the principle of electrothermal exchange by heat.

The external air passing through the heat exchanger 14 from the external air inlet 12 is formed on the opposite side to the suction hole 12 by an external air supply unit (not shown) formed in the main body case 10. It is supplied into the room through the external air supply hole (16).

On the other hand, the indoor air inlet 18 is formed on the side of the external air supply hole 16, the indoor air is sucked into the main body case 10 of the ventilator. In addition, an indoor air exhaust hole 20 through which the indoor air sucked into the inside of the ventilator from the indoor air intake port 18 is formed at a side surface of the external air intake port 12.

The heat exchanger 14 has four heat exchanger support frames 22 formed long in front and rear at four corners, and prefilters 24 are installed on both lower sides of the heat exchanger 14. The prefilter 24 serves to filter foreign matter mixed in the outside air, and the prefilter 24 is formed separately from the heat exchanger 14 and is detached.

In addition, the ventilation system having the above configuration may be formed such that the air inlets and outlets 12 and 20 formed at one end thereof are exposed to the outside of the building, and a cross section of the installation state is illustrated in FIG. 3. That is, the side end of the outside air suction hole 12 is installed to be exposed to the outside of the building wall (30).

However, the conventional ventilation apparatus as described above has the following problems.

In the ventilation device as described above, since the air inlets 12, 16, 18, and 20 are formed only on both sides, there is a problem that it is not suitable for various building structures.

That is, due to the structure of the building, the air inlet and outlet may be provided in addition to the side of the ventilation device, the upper surface or the lower surface may be used, but in the above-described configuration, it is difficult to expect such flexibility of installation.

In addition, when the ventilation device is installed as in the case of FIG. 3, external rainwater flows through the external air inlet 12 to cause damage to the inside of the ventilation device.

In addition, in the conventional ventilation device as described above, since the air outlet is formed only on the side, an air duct (not shown) should be connected to this side. Therefore, installation is restricted in a narrow space.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to provide a ventilation system capable of drawing in and out of air in various ways.

Another object of the present invention is to provide a ventilation system that is easier to install even in a narrow space.

1 is a perspective view of a ventilation apparatus according to the prior art.

Figure 2 is a perspective view showing a pre-heat exchanger and a pre-filter of the ventilation apparatus according to the prior art.

3 is a front view of the total heat exchanger of FIG.

Figure 4 is an exploded perspective view showing the main configuration of a preferred embodiment of the ventilation system according to the present invention.

Figure 5 is a perspective view showing the internal configuration of a preferred embodiment of the ventilation system according to the present invention.

Figure 6 is a partial front view showing the installation state of the total heat exchanger configuration of the preferred embodiment of the ventilation system according to the present invention.

7 is a partial side cross-sectional view showing a state in which a preferred embodiment of the ventilation system according to the present invention is mounted on a building wall.

8 is a state diagram showing a state in which air flows inside the ventilation system according to the present invention during the full-heat ventilation mode operation.

9 is a state diagram showing a state in which air flows inside the ventilation system according to the present invention during the normal ventilation mode operation.

Explanation of symbols on the main parts of the drawings

50. Main body case 52. External air intake

54. Left suction duct 56. Indoor air outlet

58. Left exhaust duct 60. Heat exchanger

61. Support frame 62. Device support

63. Filter support 68. Prefilter

71. Handle 73. High Performance Filter

80. Exhaust fan 82. External air outlet

84. Outlet mounting hole 86. Right exhaust duct

88. Indoor air intake port 90. Indoor air intake hole

92. Right suction duct 94. Damper

96. Air supply fan 100. Control box

102. Ceiling Fixture 104. Checking Fixture

106. Inspection Door 108. Front Mounting Hole

108 '. Front hole blocking plate 110. Top mounting hole

110 '. Top hole blocking plate 112. Bottom mounting hole

112 '. Lower hole blocking plate 114. Rear mounting hole

114 '. Back Hole Blocking Board

Ventilation system according to the present invention for achieving the above object, the body case is configured in the shape of a rectangular box to form an appearance; An external air intake port formed on one side of the main body case and serving as an inlet for intake of external air; An external air supply fan for forcibly blowing the air sucked from the external air inlet into the room; An external air outlet formed on one side of the external air inlet and serving as an outlet through which air blown by the air supply fan is blown into the room; An indoor air inlet formed on one side of the main body case and serving as an inlet through which indoor air is sucked; An indoor air exhaust fan that blows air that has passed through the indoor air inlet to the outside; An indoor air outlet formed on one side of the main body case and serving as an outlet through which the indoor air is discharged to the outside; A total heat exchanger configured to allow the external air sucked from the external air intake port and the air sucked from the indoor air intake port to exchange heat with each other; Upper and lower sides and side surfaces of the main body case are provided with mounting holes for mounting the outlet or the suction port, respectively.

The mounting hole is formed so that one surface of the main body case penetrates, and is configured to allow air to flow into and out of the main body case.

The discharge port and the suction port are configured in a shape corresponding to the shape of the mounting hole, and are mounted on an outer surface of the main body case.

According to the ventilation system according to the present invention having such a configuration, since the air flow path can be formed in various ways according to the configuration of the building there is an advantage that the installation of the ventilation system is easy.

4 schematically illustrates an example of a ventilation system according to the present invention in an exploded perspective view, and FIG. 5 shows an internal configuration of the ventilation system according to the present invention. And, Figure 6 shows the configuration of the heat exchanger and the support frame according to the present invention in a cross-sectional view, Figure 7 shows a state in which the ventilation system according to the present invention is mounted in a building.

As shown in these figures, a substantially rectangular box-shaped body case 50 forms an appearance. The body case 50 forms the appearance of the entire product, and supports the installation of the internal structure to protect, and at the same time serves to block foreign matter from entering the product from the outside.

On the left side of the main body case 50, an external air inlet 52, which is an inlet for inhaling external air, is installed to protrude laterally. An inlet mounting hole (not shown) is formed at the left end of the main body case 50 so that the external air inlet 52 is inserted and mounted therein.

Inside the outside air inlet 52, a left suction duct 54 is disposed between the outside air intake 52 and the heat exchanger 60 so that the outside air drawn from the intake 52 can reach the heat exchanger 60, which will be described below. Is formed. That is, the left suction duct 54 serves as a suction passage that guides the outside air to be sucked smoothly.

An internal heat exchanger 60 is provided at an inner central portion of the main body case 50. The heat exchanger 60 is configured to have a hexagonal column shape, and has a cross-flow plate type structure. That is, it is configured to separate the supply and exhaust passages with a partition plate of special processed paper so that outside air and indoor air are not mixed with each other.

Therefore, the heat exchanger 60 as described above allows each air having a temperature difference to pass through different flow paths, thereby allowing moisture and sensible heat to exchange latent heat by a high-efficiency heat exchanger film forming layers of the different flow paths. Heat exchange causes heat exchange. That is, the special processing paper used for the total heat exchanger 60 is characterized by passing only heat and moisture without passing air.

The total heat exchanger (60) having the configuration described above performs electrothermal exchange between the air supply and the exhaust in the apparatus, absorbs the heat of the air from the exhaust to the outside, and transfers it to the air supplied to the room, whereby the state of the indoor air is Make it less affected.

This electrothermal ventilation mode may be implemented by the user's selection. That is, in general, the heat transfer ventilation mode as described above is mainly used in summer and winter when the temperature difference between the indoor and outdoor is large, and when the temperature difference between the indoor and outdoor is not very large, such as spring or autumn, the damper 94 will be described below. By changing the passage of the air discharged to the outside to prevent the air exhausted to pass through the heat exchanger 60, it can be used in the normal ventilation mode.

On the other hand, the upper and lower ends of the heat exchanger 60 having a hexagonal cross-section is provided with a support frame 61, the heat exchanger 60 long before and after. The support frame 61 supports the load of the total heat exchanger 60 so that the total heat exchanger 60 is firmly supported, and also serves as a guide rail when the front heat exchanger 60 is attached and detached.

The support frame 61 of the heat exchanger 60 is an element support 62 for guiding forward and backward movement while supporting the load of the heat exchanger 60 and a filter extending laterally from the element support 62. It consists of a support part 63.

The element support portion 62 is composed of a main body contact surface 62 'contacting the main body case 50, and an element contact surface 62 "formed to protrude upward from both ends of the main body contact surface 62'. The element support portion 62 has a central portion recessed to form a tunnel shape. The lower end portion of the tunnel shape is in contact with the main body case 50, and the filter support portion 63 is formed of the element support portion 62. And an inclined surface 63 'which is formed to be inclined laterally downward from the side end, and a bent rib 63 "which is formed to be bent vertically from the inclined surface 63'.

Side guides 64 are provided at the side edges of the heat exchanger 60. The side guide 64 is composed of an element support portion 65 surrounding the edge of the heat exchanger 60, and a filter support portion 66 protruding from the element support portion 65. The filter support portion 66 is composed of a vertical surface 66 'protruding vertically from the element support portion 65, and a bending rib 66 "formed laterally bent from the vertical surface 66'.

That is, the element support portion 65 of the side guide 64 is provided in the corner of the heat exchanger 60 is formed in a substantially 'b' shape so as to be in contact with both sides of the corner at the same time, the 'b' shaped A pair of filter support portions 65 are formed to protrude from each surface of the element support portion 65.

Accordingly, the prefilter 68 is mounted to slide forward and backward between the support frame 61 and the filter support 63 of the side guide 64 facing each other. The prefilter 68 is provided to both sides of the lower portion of the total heat exchanger (60) to filter the foreign matter in the air.

That is, the pre-filter 68 provided on the lower left side of the total heat exchanger 60 into which the external air is sucked increases the cleanliness of the air supplied to the room by filtering out the foreign matter mixed in the external air, and the heat exchanger 60 ) Protects against foreign objects. In addition, the pre-filter 68 provided on the lower right side of the heat exchanger (60) filters the foreign matter mixed in the air exhausted from the inside to the outside, thereby protecting the heat exchanger (60) to extend the life. Will be

The total heat exchanger (60) is generally provided with two before and after, such a heat exchanger (60) is supported by the support frame 61 of the heat exchanger (60) and slide back and forth. Therefore, the front surface of the heat exchanger 60 is further provided with a handle 71 for facilitating forward and backward movement.

A high performance filter 73 is further provided on the upper right side of the total heat exchanger 60. The high performance filter 73 serves to filter back the dust particles in the intake air. In other words, the pre-filter 68 of the fibrous mat form, the large dust in the air is first filtered, the heat is transferred while passing through the heat exchanger 60, the air passed through the heat exchanger (60) Is filtered by the high-performance filter 73 to fine foreign matter again.

On the other hand, the left rear end of the main body case 50 is provided with an indoor air outlet 56 for discharging the indoor air to the outside, the outlet 56 is an outlet mounting hole (shown in the main body case 50) Not inserted) and fixed. In addition, a left discharge duct 58 is formed inside the outlet mounting hole to guide the indoor air forcedly blown by the exhaust fan 80 to be described below to the indoor air outlet 56.

One side of the left exhaust duct 58 is provided with an indoor air exhaust fan (80). The exhaust fan 80 serves to forcibly blow the air sucked through the indoor air intake port 88 to be described below to the discharge port 56. Preferably, the exhaust fan 80 is configured as a siroco fan.

The outside air outlet 82 is formed at the right end of the main body case 50, that is, on the side opposite to the position at which the outside air inlet 52 is installed. The outlet 82 is inserted into the outlet mounting hole 84 formed on the right side of the main body case 50 and installed to protrude to a right side from the right side of the main body case 50 to the right side. In addition, a right exhaust duct 86 is formed inside the outlet mounting hole 84 to guide external air forcedly blown from the air supply fan 96 to the outlet 82 to be described below.

An indoor air suction port 88 is provided at the right rear end of the main body case 50, that is, the opposite side to the position where the indoor air discharge port 56 is installed. The indoor air inlet 88 is installed to protrude from the right side of the main body case 50 to the right side, and is fixed to the circular indoor inlet mounting hole 90 formed at the rear end of the right side of the main body case 50. do. In addition, a right suction duct 92 is formed inside the indoor suction hole mounting hole 90 to guide the air sucked from the indoor air suction hole 88 to the heat exchanger 60.

On the other hand, the right side suction duct 92 is provided with a damper 94 to selectively flow the indoor air sucked through the indoor air inlet 88 to the heat exchanger (60). That is, the damper 94 opens and closes the right suction duct 92 under the control of the control box 100 to be described below. Therefore, if the damper 94 shields the right suction duct 92, the indoor air sucked through the indoor air intake port 88 does not pass through the heat exchanger 60, and the indoor air outlet 56 Is discharged to the outside through).

An air supply fan 96 is provided between the external air outlet 82 and the indoor air outlet 56 to force external air to the external air outlet 82. Therefore, the outside air sucked through the outside air inlet 52 is discharged into the room through the outside air outlet 82 by the air supply fan 96.

The control box 100 is installed at the right end of the main body case 50. A control unit is formed inside the control box 100 to control the operating conditions of the ventilation system. That is, the power is interrupted to turn on / off the ventilation system, and the fan speed is controlled by controlling the fan rotation speed of the air supply fan 96 and the exhaust fan 80. On the other hand, by controlling the driver (not shown) of the damper 94 controls the ventilation method and the like to enable the selection of the total heat exchange mode or normal ventilation mode.

On the front of the main body case 50 is installed a ceiling fixture 102 to allow the ventilation system is installed on the ceiling of the house. In addition, a check hole 104 is formed at the front center portion of the main body case 50. An inspection door 106 is provided on the front surface of the inspection opening 104 to selectively open and close the inspection opening 104. Therefore, when it is necessary to replace or check the heat exchanger 60, the inspection door 106 is opened and the heat exchanger 60 can be taken out to work.

On the other hand, the front mounting hole 108 is further formed in the front left portion of the main body case 50 of the ventilation system as described above. When the ventilation system as described above is equipped with the front mounting hole 108, when the inflow passage of the air needs to be forwarded due to the structure of the building, the front air inlet 52 is not installed on the left side of the front surface. It is formed to be mounted to the mounting hole (108).

The front hole blocking plate 108 ′ is further installed on the front surface of the front mounting hole 108. The front hole blocking plate 108 ′ shields the front mounting hole 108 such that air does not flow into or out of the front mounting hole 108 when the front mounting hole 108 is not used.

Meanwhile, an upper mounting hole 110 and an upper hole blocking plate 110 ′, such as the front mounting hole 108 and the front hole blocking plate 108 ′, are further formed on the upper front left side of the main body case 50. . The upper surface mounting hole 110 is also preliminarily formed so that the external air inlet 52 can be mounted like the front mounting hole 108.

In addition, a lower surface mounting hole 112 such as the upper surface mounting hole 110 and the upper hole blocking plate 110 'may also be formed on the lower left front portion of the main body case 50 corresponding to the position at which the upper surface mounting hole 110 is formed. ) And the lower surface hole blocking plate 112 'is further formed. The lower surface mounting hole 112 is also formed in the same way as the front mounting hole 108, and is used when the external air is to be introduced into the ventilation system from the lower side.

As described above, the mounting holes 108, 110 and 112 and the blocking plates 108 ′, 110 ′ and 112 ′ which are preliminarily formed on three surfaces of the main body case 50 are not only the left end of the main body case 50 but also the main body case. It is also formed in the rear left part of 50, respectively. In this case, the rear mounting hole 114 and the rear hole blocking plate 114 'may be preliminarily formed on the rear of the main body case 50 instead of the front mounting hole 108 and the front hole blocking plate 108'. will be.

In addition, the preliminary mounting holes 108, 110, and 114 are formed on three surfaces of the rear end portion, respectively, and are also formed at the front end portion thereof. Of course, since the control box 100 is mounted on the front of the front end of the main body case 50, the front mounting hole 108 is not formed.

In this way, if air inlets and outlets are formed in each direction, it is possible to cope with various structures of various buildings. Therefore, the installation of the ventilation device becomes easy.

That is, as shown in FIG. 7, when the installation space of the ventilation device is narrow, the external air inlet 52 is mounted to the lower surface mounting hole 112 formed at the lower left end of the main body case 50. You can do it.

In this case, the suction air duct 120 is connected to the outside air suction port 52 mounted in the bottom mounting hole 112 so as to communicate with the outside of the building wall 122. Therefore, even when rain falls rain may penetrate into the suction duct 120, but will not be introduced into the ventilation system through the external air inlet (52).

Hereinafter, a state in which air outside the room flows through the ventilation system according to the present invention having the configuration as described above will be described with reference to FIGS. 8 and 9.

8 shows a state of air flow through the ventilation system when the full heat ventilation mode is activated. This electrothermal ventilation mode is generally used when there is a large difference in temperature and humidity between indoors and outdoors, such as summer or winter.

Referring to the ventilation state as shown in the drawing, the damper 94 opens the right suction duct 92 according to a control command in the control box 100 according to the user's selection of the heat transfer ventilation mode.

In addition, according to the operation of the air supply fan 96, external air is sucked into the ventilation system through the external air inlet 52, and the external air is guided by the left suction duct 54 to transfer the heat. It is sucked into the total heat exchanger (60) through the lower left side of the exchanger (60). At this time, since the external air passes through the pre-filter 68 mounted on the lower left side of the heat exchanger (60), foreign matter in the air is first filtered and then sucked into the heat exchanger (60).

The air sucked into the heat exchanger (60) exchanges heat and moisture from the discharged indoor air and then is discharged through the upper right side of the heat exchanger (60). At this time, since the high-performance filter 73 is installed on the upper right side of the heat exchanger (60), foreign matters of the air passing through the heat exchanger (60) are filtered again, resulting in cleaner air.

Air passing through the heat exchanger (60) and the high performance filter (73) is forcibly blown by the air supply fan (96) and indoors through an external air outlet (82) installed on the right side of the main body case (50). Is discharged.

On the other hand, the indoor air is exhausted to the outside by the operation of the exhaust fan 80, the indoor air is sucked into the ventilation system through the indoor air inlet 88 and then guided by the right suction duct 92 And is sucked into the total heat exchanger (60) through the lower right side of the total heat exchanger (60).

At this time, since the pre-filter 68 is mounted on the lower right side of the heat exchanger 60, foreign matter in the indoor air is filtered out. Therefore, since the clean air is sucked into the heat exchanger (60), the heat exchanger (60) is protected and its life is extended more.

The indoor air sucked into the heat exchanger (60) exchanges heat and moisture to outside air sucked from the outside, and then exits through the lower left side of the heat exchanger (60). The indoor air exiting the heat exchanger (60) is forcedly blown by the exhaust fan (80) and exhausted to the outside through the indoor air outlet (56) provided at the rear end of the left side of the main body case (50). .

Next, an air flow state in the general ventilation mode will be described with reference to FIG. 9. In the general ventilation mode, when indoor and outdoor temperature and humidity differences are small, such as spring or autumn, indoor air is bypassed by the heat exchanger 60 and bypassed immediately.

Therefore, when the user selects the general ventilation mode, the damper 94 shields the right suction duct 92 according to a control unit command inside the control box 100. In this case, the air sucked through the indoor air intake port 88 is forcibly blown to the indoor air outlet 56 by the exhaust fan 80 and discharged to the outside without passing through the heat exchanger 60.

On the other hand, when looking at the flow of the outside air, according to the operation of the air supply fan 96, the outside air is sucked into the ventilation system through the outside air inlet 52, the outside air is the left side suction duct (54) It is guided by) and is sucked into the heat exchanger 60 through the lower left side of the heat exchanger (60). At this time, since the external air passes through the pre-filter 68 mounted on the lower left side of the heat exchanger (60), foreign matter in the air is first filtered and then sucked into the heat exchanger (60).

Since the air sucked into the heat exchanger (60) does not pass through the heat exchanger (60), the discharged indoor air is discharged through the upper right side of the heat exchanger (60) without exchanging heat and moisture. At this time, since the high-performance filter 73 is installed on the upper right side of the heat exchanger (60), foreign matters of the air passing through the heat exchanger (60) are filtered again, resulting in cleaner air.

Air passing through the heat exchanger (60) and the high performance filter (73) is forcibly blown by the air supply fan (96) and indoors through an external air outlet (82) installed on the right side of the main body case (50). To be discharged.

As described above, in the general ventilation mode, unlike in the case of the total heat ventilation mode, heat and moisture are not exchanged inside the heat exchanger 60.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the above technical scope.

For example, in the ventilation system as described above, since the control box 100 is mounted on the front of the front end of the main body case 50, the front mounting hole 108 is not formed, but the control box ( In the case where 100) is installed in another place, it is natural that the front mounting hole 108 can be installed in this part.

According to the ventilation system as described above, the air inlet and outlet to be a flow passage of the air drawn into and out of the ventilation system is formed on the upper and lower surfaces and each side of the main body case.

Therefore, it is possible to easily cope with the case where the space of the building to which the ventilation system is to be installed is insufficient or when it is difficult to form the air access passage due to the structure of the building.

That is, in the prior art, the air inlet and outlet is formed only on the side surface, but the air inlet and outlet should be formed laterally, but according to the present invention, the air inlet and outlet can be formed in any direction, thereby improving the ease of installation of the ventilation system. The installation work becomes more convenient.

This, in turn, has the effect of increasing the purchasing power of the product to the consumer, resulting in a reduction in the labor required for installation.

Claims (3)

A main body case configured in a rectangular box shape to form an appearance; An external air intake port formed on one side of the main body case and serving as an inlet for intake of external air; An external air supply fan for forcibly blowing the air sucked from the external air inlet into the room; An external air outlet formed on one side of the external air inlet and serving as an outlet through which air blown by the air supply fan is blown into the room; An indoor air inlet formed on one side of the main body case and serving as an inlet through which indoor air is sucked; An indoor air exhaust fan that blows air that has passed through the indoor air inlet to the outside; An indoor air outlet formed on one side of the main body case and serving as an outlet through which the indoor air is discharged to the outside; A total heat exchanger configured to allow the external air sucked from the external air intake port and the air sucked from the indoor air intake port to exchange heat with each other; Ventilation system, characterized in that the upper and lower sides and the side of the main body case is provided with a mounting hole for mounting the outlet or the suction port. The ventilation system of claim 1, wherein the mounting hole is formed so that one surface of the main body case penetrates, and the air is allowed to flow into and out of the main body case. The ventilation system according to claim 1 or 2, wherein the discharge port and the suction port have a shape corresponding to the shape of the mounting hole, and are mounted on an outer surface of the main body case.