KR20050001506A - A motor assembly mounting structure of ventilation system - Google Patents

Abstract

PURPOSE: A structure of mounting a motor assembly of a ventilating system is provided to easily mount a motor assembly and a fan by separately manufacturing the motor mount and a shroud. CONSTITUTION: A shroud(120) is mounted at a main body case forming an external appearance of a ventilating system for guiding a flow of air. A motor assembly(110) provides rotary power to a blower fan(100). A motor mount(140) is formed at one side of the shroud for supporting the motor assembly, wherein the motor mount is formed separately from the shroud and is mounted by a coupling element. A guide protrusion(148) is formed at one side of the motor mount to guide the mount of the motor mount. A protrusion insertion hole(124) is formed at one end of the shroud to insert the guide protrusion thereinto.

Description

A motor assembly mounting structure of ventilation system

The present invention relates to a ventilation system, and more particularly, to a motor assembly mounting structure of the ventilation system, the attachment and detachment of the motor for providing power to the fan forcibly blowing air.

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 pre-filter of a conventional ventilation device are shown in FIG. 2, and a motor assembly mounting structure of the conventional ventilation device is shown in an exploded perspective view. .

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 so as to allow 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 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.

On the other hand, the left and right sides of the heat exchanger as described above are provided with a fan (pan) for forcibly discharging the indoor air to the outside, and a fan (fan) for forcing the outdoor air to flow into the room, respectively, FIG. ) And an exploded perspective view of the mounting structure of the motor is shown.

As shown in the drawing, the fan assembly includes a blowing fan 30, a motor assembly 32 providing rotational power to the blowing fan 30, and a motor mount 34 supporting the motor assembly 32. And a shroud 36 for guiding air to which the motor mount 34 is fastened.

The blower fan 30 is composed of a siroco fan, and serves to forcibly blow indoor air to the outside, or forcibly suck the outdoor air to the room. In addition, one side end of the blower fan 30 is coupled to the motor assembly 32 which generates rotational power by electric force and rotates.

The bottom surface of the body case 10 is provided with a shroud 36 to be perpendicular thereto. In addition, a motor mount 34 is formed at one end of the shroud 36, and the motor assembly 32 is mounted and fixed to the motor mount 34. The motor mount 34 is integrally formed with the shroud 36 or fixed by welding or the like.

The conventional ventilation device as described above has the following problems.

The conventional motor mount 34 and shroud 36 as described above are generally formed of an integrated sheet metal. Therefore, there are many problems in assembling the motor assembly 32 as described above.

That is, after the motor mount 34 and the shroud 36 are mounted on the main body case 10, the motor assembly 32 is fastened to the motor mount 34, or the motor assembly 32 is mounted on the motor case 32. Since the shroud 36 should be mounted on the bottom surface of the main body case 10 in a state in which the motor mount 34 is mounted, the work becomes difficult.

Such a problem may occur not only when the motor assembly 32 is to be mounted, but also when the motor assembly 32 is to be disassembled.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to provide a motor assembly mounting structure of a ventilation system in which the motor assembly of the ventilation system is more easily disassembled and assembled.

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.

Figure 3 is an exploded perspective view showing the configuration of the motor assembly mounting structure according to the prior art.

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

Figure 5 is a cutaway perspective view showing the internal configuration of the ventilation system employing a preferred embodiment of the ventilation system motor assembly mounting structure according to the present invention.

Figure 6 is an exploded perspective view showing the main configuration of the preferred embodiment of the ventilation system motor assembly mounting structure according to the present invention.

Figure 7 is a side cross-sectional view of the shroud and motor mount, which is a main configuration of a preferred embodiment of the ventilation system motor assembly mounting structure according to the present invention.

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

62. Support frame 64. Left guide protrusion

64 '. Right guide protrusion 66. Exchange guide

68. Filter 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

100. Exhaust fan 110. Motor assembly

112. Motor housing 114. Fastening part

116. Fasteners 120. Shrouds

122. Through hole 124. Protrusion insertion hole

130. Lower Fixture 130 '. Top fixture

132. Main body fixture 134. Support fixture

140. Motor mount 142. Shroud mounting

144. Motor Mount 146. Slope

150. Air supply fan

The motor assembly mounting structure of the ventilation system according to the present invention for achieving the above object, in the ventilation system to ventilate the indoor air to the outside by the blowing fan, the outside air is sucked into the room to ventilate the interior. A shroud mounted to a main body case forming an exterior of the ventilation system and guiding the flow of air; A motor assembly providing rotational power to the blowing fan; A motor mount formed at one side of the shroud to support the motor assembly; The motor mount is formed separately from the shroud, characterized in that mounted by the fastening means.

A guide protrusion for guiding the mounting of the motor mount is formed to protrude from one side of the motor mount, and a protrusion insertion hole into which the guide protrusion is inserted is formed at one end of the shroud.

According to the motor assembly mounting structure of the ventilation system according to the present invention having such a configuration, there is an advantage that the disassembly and assembly of the motor becomes 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 is an exploded perspective view of the motor assembly mounting structure according to the present invention, Figure 7 shows the mounting state of the motor mount and shroud according to the present invention in a side cross-sectional view.

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 fixed.

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 inner heat exchanger 60 is provided at an inner central portion of the main body case 50. The heat exchanger 60 has a hexagonal column shape in general, 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 as described above performs electrothermal exchange between the air supply and the exhaust in the apparatus, absorbs the heat of the air from the exhaust going to the outside, and transfers it to the air supplied to the room, whereby the state of the indoor air is To be less affected by

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 to 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 is also possible to use in the normal ventilation mode.

On the other hand, the upper and lower surfaces of the main body case 50 is provided with a support frame 62 for supporting the heat exchanger 60 long before and after. The support frame 62 supports the load of the heat exchanger 60 so that the 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 62 is symmetrically formed to face each other on the upper and lower surfaces of the body case 50, the guide frame for guiding the heat exchanger 60 to slide forward and backward in the support frame 62. (64, 64 ') are formed. That is, a predetermined portion protrudes upward from the left side of the support frame 62 to form the left guide protrusion 64, and a right guide protrusion 64 ′ from which the predetermined portion protrudes upward from the right side is formed. .

In addition, the exchange guide 66 is further installed at the left and right edges of the total heat exchanger 60. The exchange guide 66 is elongated back and forth to support the side end of the heat exchanger 60 and to guide the front and rear movement. In addition, the exchange guide 66 may be further formed with a filter support (not shown) in which the filter 68, which will be described below, is slidably inserted forward and backward.

A filter 68 is installed on the lower left side of the total heat exchanger 60. The filter 68 filters the foreign matter in the air sucked from the outside. That is, the filter 68 filters the foreign matter mixed with the outside air to increase cleanliness of the air supplied to the room, and protects the heat exchanger 60 from the foreign matter.

The preliminary flow path 70 is formed at the rear of the total heat exchanger 60. The preliminary flow path 70 is formed left and right at the rear end of the main body case 50, and a damper 94 to be described below blocks the right suction duct 92 so that the indoor air is the heat exchanger 60. If it is discharged directly to the outside without passing through is the part that becomes the air passage.

Therefore, a flow path wall 72 formed of styrofoam is provided between the preliminary flow path 70 and the heat exchanger 60. In addition, a reinforcing plate 74 made of metal may be further provided between the flow path wall 72 and the heat exchanger 60. The reinforcement plate 74 is formed of an iron plate having a predetermined thickness, and is coupled to the rear end of the support frame 62 and the exchange guide 66 to protect the flow path wall 72 from external impact. do.

In addition, the pre-heat exchanger 60 is generally provided with two before and after, such a pre-heat exchanger 60 is supported by the support frame 62 of the pre-heat exchanger 60 and slide back and forth. Therefore, the front surface of the heat exchanger 60 is further provided with a handle 71 to facilitate the forward and backward movement.

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 (not shown) formed in the main body case 50 Is 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 100 to the indoor air outlet 56.

An external 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 external air inlet 52 is installed. The outlet 82 is inserted into the outlet mounting hole 84 formed on the right side of the body case 50 and installed to protrude in a right direction from the right side of the body case 50 to the right side. In addition, a right exhaust duct 86 is formed inside the outlet mounting hole 84 to guide the external air forcedly blown from the air supply fan 150 to the outlet 82.

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, a damper 94 is provided inside the right suction duct 92 to selectively flow the indoor air sucked through the indoor air suction port 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 200 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).

The indoor air exhaust fan 100 is provided between the indoor air outlet 56 and the external air inlet 52. The exhaust fan 100 serves to forcibly blow the air sucked through the indoor air inlet 88 to the outlet 56, and is preferably composed of a siroco fan.

In addition, a motor assembly 110 as shown in FIG. 6 is mounted at one side of the exhaust fan 100. A motor (not shown) provided inside the motor assembly 110 forms a rotational power by electricity input from the outside and transmits the rotating power to the exhaust fan 100.

A fastening part 114 is formed at a central portion of the motor housing 112 forming the exterior of the motor assembly 110 to protrude laterally along the circumferential surface of the motor housing 112. The fastening part 114 is formed with a plurality of fastening holes 116 through which a screw is fastened.

Shroud 120 is installed on the bottom surface of the main body case 50. The shroud 120 is provided to protrude upward from the bottom surface of the main body case 50 to partition the air sucked into the exhaust fan 100 and the exhaust air. In addition, a through hole 122 corresponding to a side size of the exhaust fan 100 is formed at the central portion of the shroud 120.

Therefore, indoor air enters the center of the exhaust fan 100 through the through hole 122 and then is discharged in the circumferential direction of the exhaust fan 100. On the other hand, the lower right side of the shroud 120 is further formed with a projection insertion hole 124 is inserted into the guide protrusion 148 formed on the lower end of the motor mount 140 to be described below.

The lower end of the shroud 120 is fixed to the bottom surface of the main body case 50, the upper end is fixed to the upper surface of the main body case 50. Therefore, fixtures 130 and 130 'are further provided to allow the top and bottom ends of the shroud 120 to be mounted on the top and bottom ends of the body case 50.

That is, a lower fixing tool 130 is provided to fix the shroud 120 to the lower end of the main body case 50, and an upper end to fix the shroud 120 to the upper end of the main body case 50. Fixture 130 'is further provided. The fasteners 130 and 130 ′ are formed by bending the body fixing part 132, which is a part fastened to the main body case 50, and vertically bent from the main body fixing part 132, and fastened to the shroud 120. It is composed of a support support station 134.

The shroud 120 is mounted with a motor mount 140. 6, the motor mount 140 is mounted on the right side of the shroud 120, and the center portion is formed to protrude to the right side. That is, the motor mount 140 has a shroud mounting part 142 which is a part which is engaged with the upper and lower ends of the shroud 120, and a motor mounting part 144 on which the fastening part 114 of the motor assembly 110 is mounted. And, it is composed of the inclined portion 146 connecting the shroud mounting portion 142 and the motor mounting portion 144.

A circular motor insertion hole 144 ′ is further formed at the center of the motor mounting part 144. The right part of the motor assembly 110 is inserted into the motor insertion hole 144 'from the left side, and the fastening hole 116 of the motor housing 112 is connected to the edge of the motor insertion hole 144'. A corresponding number of mounting holes 144 " are formed. Thus, a plurality of screws are inserted into and fastened to the mounting holes 144 " and the fastening holes 116, whereby the motor assembly 110 is It is mounted on the motor mount 140.

On the other hand, the lower side of the motor mount 140, that is, the guide surface 148 is further provided on the left side of the shroud mounting portion 142. The guide protrusion 148 protrudes from the motor mount 140 and is integrally formed. The guide protrusion 148 is inserted into the protrusion insertion hole 124 formed in the shroud 120 to thereby mount the mounting position of the motor mount 140. By accurately guiding, it serves to guide the fastening of the motor mount 140 to be more easily mounted on the shroud 120.

That is, when the motor mount 140 is mounted on the shroud 120, as shown in FIG. 7, the guide protrusion of the motor mount 140 is first inserted into the protrusion insertion hole 124 of the shroud 120. After the 148 is inserted, the upper end portion is rotated counterclockwise with the lower end portion of the motor mount 140 as the rotational shaft so that the motor mount 140 is in close contact with the shroud 120. Then, the upper end and the lower end of the motor mount 140 are fixed to the shroud 120 by using a screw.

An air supply fan 150 having the same shape as the exhaust fan 100 is installed between the external air outlet 82 and the indoor air outlet 56 to forcibly send external air to the external air outlet 82. do. Therefore, the outside air sucked through the outside air inlet 52 is guided to the right exhaust duct 86 by the air supply fan 150 and discharged into the room through the outside air outlet 82.

The control box 200 is installed at the right end of the main body case 50. A control unit is formed inside the control box 200 to control the operating conditions of the ventilation system. That is, the power supply is interrupted to turn on / off the ventilation system, and the fan speed is controlled by controlling fan rotation speeds of the air supply fan 150 and the exhaust fan 100. On the other hand, by controlling the driver (not shown) of the damper 94 controls the ventilation method to enable the selection of the total heat exchange mode or the general ventilation mode.

The front of the main body case 50 is provided with a ceiling fixture 202 to allow the ventilation system is installed on the ceiling of the building. In addition, a check hole 204 is formed at the front center portion of the main body case 50. An inspection door 206 is provided on the front surface of the inspection opening 204 to selectively open and close the inspection opening 204. Therefore, when it is necessary to replace or check the heat exchanger 60, the inspection door 206 can be opened and the heat exchanger 60 can be taken out to work.

On the other hand, the front mounting hole 208 is further formed on the front left side of the ventilation system as described above. When the front mounting hole 208 is equipped with the ventilation system as described above, the front air inlet 52 is not installed on the left side when the inflow passage of the air needs to be forward due to the construction of the building. It is preliminarily formed to be mounted in the mounting hole (208). In addition, when the front mounting hole 208 is not used, the front mounting hole 208 is provided with a blocking plate 208 ′ which blocks air from flowing through the front mounting hole 208 to shield the front mounting hole 208. do.

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.

As shown in the drawing, the damper 94 opens the right suction duct 92 according to a control command in the control box 200 according to the user's selection of the heat transfer ventilation mode.

In addition, according to the operation of the air supply fan 150, 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 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).

Air passing through the heat exchanger (60) is forcibly blown by the air supply fan (150) and guided to the right exhaust duct (86) so as to be installed on the right side of the main body case (50). Through 82).

On the other hand, the indoor air is exhausted to the outside by the operation of the exhaust fan 100, the indoor air is sucked into the ventilation system through the indoor air intake port 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).

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). Indoor air exiting the heat exchanger (60) is forcibly blown by the exhaust fan (100) and guided to the left exhaust duct (58) to be provided at the rear end of the left side of the main body case (50). It is exhausted to the outside through the outlet 56.

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 command inside the control box 200. In this case, the air sucked through the indoor air intake port 88 is forcibly blown to the indoor air outlet 56 through the preliminary flow passage 70 and discharged through the preliminary flow passage 60 without being discharged to the outside.

On the other hand, when looking at the flow of the outside air, according to the operation of the air supply fan 150, 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 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.

Air passing through the heat exchanger (60) is forcibly blown by the air supply fan (150) and guided to the right exhaust duct (86) so as to be installed on the right side of the main body case (50). Through 82).

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.

According to the motor assembly mounting structure of the ventilation system as described above, the motor mount and the shroud are configured to be manufactured and mounted separately.

Therefore, the motor assembly and the fan can be easily mounted. That is, compared to the conventional configuration in which the motor mount and the shroud are formed integrally, the work order can be changed, and there is an advantage that the mounting work can be easily performed even in a narrow space.

The lower end of the motor mount is formed to protrude a guide protrusion, and the shroud has a protrusion insertion hole into which the guide protrusion is inserted.

Therefore, when the motor mount is mounted on the shroud, first, the upper and lower ends of the motor mount are fixed to the shroud while the guide protrusion is inserted into the projection insertion hole to determine the mounting position. Mounting of the motor mount becomes easier.

That is, since the effort for matching the mounting hole of the motor mount with the mounting hole of the shroud is reduced, the work efficiency is improved.

Claims (2)

In the ventilation system that ventilates the indoor air to the outside by the blowing fan, the outside air is sucked into the interior to ventilate the interior, A shroud mounted to a main body case forming an exterior of the ventilation system and guiding the flow of air; A motor assembly providing rotational power to the blowing fan; A motor mount formed at one side of the shroud to support the motor assembly; And the motor mount is formed separately from the shroud and mounted by a fastening means. According to claim 1, wherein one side of the motor mount guide protrusions for guiding the mounting of the motor mount is formed to protrude, one end of the shroud is characterized in that the projection insertion hole for inserting the guide projections is formed Mounting structure of the motor assembly of the ventilation system.