KR20080110109A - Indoor unit of cassette type air conditioner - Google Patents

Abstract

The present invention relates to an indoor unit of a cassette type air conditioner having a link assembly for limiting the opening angle of the suction grill when the suction grill is opened for air filter extraction.

In the indoor unit of the cassette-type air conditioner fixed to the ceiling to match the indoor air, the inlet port 112 and the discharge port 114 is formed, the front panel 110 for guiding the intake and discharge of the air, and An air filter 122 for filtering foreign substances in the air sucked through the inlet 112, a suction grill 120 coupled to one side of the front panel 110 to support the air filter 122, and the suction grill ( 120 is coupled to one side of the front panel 110 is configured to include a link assembly 200 for limiting the opening angle of the suction grill 120. The link assembly 200 is rotatably coupled to one side of the front panel 110, the link 220 supporting a part of the load of the suction grill 120 when the suction grill 120 is opened, and the suction grill 120. Protruded on one side, it is characterized in that it comprises a guide protrusion 240 is coupled to the link 220 so that the downward movement of the suction grill 120 is limited. According to the present invention configured as described above, there is an advantage that safety accidents due to air filter dropping are prevented in advance and ease of use is improved.

Description

Indoor unit for cassette type air conditioner {Indoor unit for cassette type air conditioner}

1 is a bottom perspective view showing a state in which a suction grill is opened in a state where an indoor unit of a cassette type air conditioner according to the prior art is installed on a ceiling;

Figure 2 is a bottom perspective view showing a state in which the front panel constituting the main portion separated from the indoor unit of the cassette-type air conditioner according to the present invention.

Figure 3 is a bottom perspective view showing the front panel appearance of one configuration in the indoor unit of the cassette-type air conditioner according to the invention.

Figure 4 is a top perspective view showing the appearance of a front panel of one configuration in the indoor unit of the cassette-type air conditioner according to the present invention.

Figure 5a is a schematic diagram showing the configuration of one embodiment of a link assembly constituting the main portion in the indoor unit of the cassette-type air conditioner according to the present invention.

Figure 5b is a schematic diagram showing an embodiment of the operation of the link assembly constituting the main portion in the indoor unit of the cassette-type air conditioner according to the present invention.

Figure 6a is a schematic diagram showing the configuration of another embodiment of the link assembly constituting the main portion in the indoor unit of the cassette-type air conditioner according to the present invention.

Figure 6b is a schematic diagram showing another embodiment of the link assembly constituting the main portion in the indoor unit of the cassette-type air conditioner according to the present invention in operation.

FIG. 7 is a longitudinal sectional view taken along the line II ′ of FIG. 6B; FIG.

Explanation of symbols on the main parts of the drawings

100. Indoor unit 110. Front panel

112. Inlet port 114. Outlet port

116. Louver 118. Motor cover

119. Hook part 120. Suction grill

122.Air filter 124.Air flow hole

130.Cabinet 140.Base

150.Drain pan 154.Through hole

180. Orifice 190. Plasma Filter

196. Control Box 200. Link Assembly

210. Supporting projections 212. Hooking projections

220.Link 222. Swivel

224.Guide bar 226.Guide hole

240. Guide protrusion 242. Coupler

The present invention relates to an indoor unit of a cassette type air conditioner, and more particularly, to an indoor unit of a cassette type air conditioner having a link assembly on one side of the suction grill to limit the opening angle of the suction grill.

In general, an air conditioner is a cooling / heating system that cools a room by a repetitive action of sucking hot air in a room, exchanging heat with a low temperature refrigerant, and then discharging it into the room. A condenser-expansion valve-evaporator that forms a series of cycles.

In particular, an air conditioner is an outdoor unit (sometimes called an 'outdoor' or a 'heat sink') mainly installed outdoors, and an indoor unit ('indoor' or 'heat absorbing side') mainly installed inside a building. The outdoor unit is provided with a condenser (outdoor heat exchanger) and a compressor, and the indoor unit is provided with an evaporator (indoor heat exchanger).

And, as is well known, air conditioners can be broadly divided into separate type air conditioners in which the outdoor unit and the indoor unit are separately installed, and integrated air conditioners in which the outdoor unit and the indoor unit are installed integrally, and separate type air conditioning in consideration of installation space or noise. The group is preferred.

That is, the multi-type air conditioner is connected to a plurality of indoor units in one outdoor unit, and the indoor unit is installed in each room for air conditioning, it is possible to obtain the effect of installing a plurality of air conditioners.

Hereinafter, the configuration of the indoor unit 0 (hereinafter, referred to as 'indoor') of the cassette type air conditioner among the general multi type air conditioners will be described with reference to the accompanying drawings.

Figure 1 is a bottom perspective view showing the appearance of the indoor unit of the cassette type air conditioner according to the prior art.

As shown in the figure, the indoor unit (1) is fixed to the top is installed inside the ceiling (R) to maintain a suspended state, the lower surface is exposed to the lower side of the ceiling to suck the indoor air and then to be discharged back into the room after heat exchange. .

Most of the indoor unit 1 is located on the ceiling and the user can see only the front panel 10 and the suction grill 20 when the user looks up at the ceiling.

The front panel forms an outer rim of the lower surface of the indoor unit 1, and a suction hole 12 is formed at the center to guide the indoor air into the indoor unit 1 by being drilled in a square shape, and the suction hole 12 is formed. On the outside, the discharge port 14 is perforated in a rectangular shape.

The louver 16 for forcing the flow direction of the discharged air is rotatably provided in the discharge port 14.

A suction grill 20 having a substantially square plate shape is mounted in the center portion of the front panel 10, that is, inside the suction port 12. The suction grill 20 is configured to filter foreign matter from the air introduced into the indoor unit 1 through the suction port 12, and an air filter 30 is provided above the suction grill 20.

The air filter 30 may be selectively washed when a large amount of foreign matter is loaded when the indoor unit 1 is used for a long time, and the suction grill 20 may be selectively removed to easily separate the air filter 30. Configured to open.

That is, the suction grill 20 is rotatably coupled to the front panel 10 with respect to the right end. In more detail, the right end of the suction grill 20 and the inner right side of the suction port 12 are coupled to each other by a hinge 18, and the suction grill 20 rotates downward with respect to the hinge 12. As shown in the figure is configured to selectively open the interior of the indoor unit (1).

And, the left side of the front panel 10 is provided with an opening and closing button 19 that is selectively pressed by the user when opening / closing the suction grill 20. The opening and closing button 19 interferes with the left end of the suction grill 20 by the elastic restoring force to prevent rotation, and when the opening and closing button 19 is pressed, the interference is terminated so that the suction grill 20 is hinged ( It becomes possible to rotate based on 18).

However, the conventional indoor unit having the configuration as described above has the following problems.

That is, when the suction grill 20 tries to open the suction grill 20 to clean the air filter 30, the suction grill 20 and the front panel 10 rotate by releasing the opening / closing button 19. Done.

Therefore, when the suction grill 20 and the air filter 30 are rotated with respect to the hinge 18 and directed downward, foreign substances loaded on the air filter 30 are scattered, which causes unsanitary problems. .

In addition, when the suction grill 20 and the air filter 30 are rotated so that the air filter 30 falls, it is not preferable because the user causes physical injury.

In addition, when the air filter 30 falls and breaks, a new air filter 30 needs to be purchased, but additional costs are generated, which causes customer complaints.

An object of the present invention is to solve the above problems, and provided with a link assembly on one side of the suction grill, the end of the link assembly is coupled to the front panel to limit the opening angle of the suction grill used when replacing the air filter It is to provide an indoor unit of a cassette type air conditioner to improve convenience.

Another object of the present invention is to provide a cassette type air conditioner, in which a link assembly is selectively detachable from a front panel, and the suction panel is coupled in various directions by providing a plurality of support protrusions to which the link assembly is coupled to the front panel. It is to provide indoor unit.

In the indoor unit of the cassette type air conditioner fixed to the ceiling to match the indoor air, the inlet and the outlet are formed, the front panel for guiding the intake and discharge of the air, and the foreign matter in the air sucked through the inlet And an air filter for filtering, a suction grill coupled to one side of the front panel to support the air filter, and a link assembly coupled to the suction grill and one side of the front panel to limit the opening angle of the suction grill. do.

The link assembly is rotatably coupled to one side of the front panel, and supports a portion of the load of the suction grill when the suction grill is opened, protrudes from one side of the suction grill, and is coupled to the link to the suction grill. Characterized in that it comprises a guide protrusion to limit the downward movement.

The guide protrusion is characterized in that it is formed integrally with the suction grill.

The link is coupled to one side of the front panel is characterized in that it comprises a rotary part that is the center of rotation of the link, and a guide bar protruding outward from the rotation part to guide the sliding of the guide projection.

One side of the front panel, it is characterized in that the support is coupled to the rotating portion for supporting the load of the link and the suction grill.

The support protrusion is elastically restored after being inserted into the rotating part to restrain the rotating part.

One side of the suction grill and the front panel, characterized in that the hinge and the hook portion which is the rotation center of the suction grill with respect to the front panel is provided.

The hinge is formed at a position opposite to the linkage assembly.

The support protrusion is characterized in that formed in a greater number than the link assembly.

According to the present invention configured as described above there is an advantage that the air filter can be replaced more safely and the ease of use is improved.

Hereinafter, a configuration of a cassette type air conditioner indoor unit (hereinafter, referred to as 'room') according to the present invention will be described with reference to the accompanying drawings.

Figure 2 is a bottom perspective view showing the appearance of the indoor unit of the cassette-type air conditioner employing a preferred embodiment of the present invention.

As shown in the figure, the indoor unit 100 is fixed to the upper part is inserted into the ceiling, the lower surface is exposed to the lower ceiling.

In addition, the indoor unit 100 has a front panel 110 forming an edge portion of the lower surface and a suction grill 120 installed at the center of the front panel 110 to allow indoor air to flow into the indoor unit 100. And a cabinet 130 forming an upper appearance of the indoor unit 100 and having a plurality of parts built therein, and a plurality of parts mounted to the inside of the indoor unit 100 while shielding the upper surface of the cabinet 130. The overall appearance is formed by the base 140 supporting the load of.

The front panel 110 has a rectangular plate shape in which a center portion is perforated in a quadrangular shape, and a suction port (112 in FIG. 3) is provided at the center portion of the front panel 110. The suction grille 120 is positioned in the suction port 112 to selectively filter foreign substances in the air introduced into the indoor unit 100 through the suction port 112.

To this end, the suction grill 120 is formed to have a size corresponding to the suction port 112 in order to prevent the air containing the foreign matter into the indoor unit 100, and in the air on the upper surface of the suction grill 120 It is preferable that an air filter (refer to reference numeral 122 of FIG. 3) for selectively filtering the contained foreign matter is installed.

The air filter 122 is formed of a flexible material and fine holes (not shown) are perforated on the entire surface. Therefore, foreign matters in the air introduced into the indoor unit 100 through the suction port 112 remain without passing through the micropores and are attached to the lower surface of the air filter 122 so that the foreign matters inside the indoor unit 100. Loading is prevented beforehand.

In addition, the suction grill 120 serves to guide the indoor air to be introduced into the indoor unit 100, and for this purpose, the air flow hole is long at equal intervals on the entire surface of the suction grill 120. 124 is formed.

The air flow hole 124 is formed by penetrating the suction grill 120 in the vertical direction, the space in the center of the indoor unit 100 is configured to communicate with the room.

Therefore, when the indoor unit 100 is operated, indoor air may be introduced into the indoor unit 100 through the air flow hole 124, and guided by the discharge port 114 to be introduced into the room again.

Then, the front / rear left / right of the front panel 110 is formed with a discharge port 114 of a long rectangular shape. The discharge port 114 is configured to guide the indoor air sucked into the indoor unit 100 through the suction port 112 to be discharged back to the room, and the inside of the indoor unit 100 is formed to communicate with the room. .

The louver 116 is mounted inside the discharge port 114 to force the flow direction of the air discharged into the room through the discharge port 114. The louver 116 has a square plate shape corresponding to the shape and size of the discharge port 114, and is rotatably installed based on both ends.

A louver motor (not shown) is coupled to one end of the louver 116. The louver motor generates rotational power when power is applied, and is coupled to the louver 116 to transmit rotational power to the louver 116.

The louver motor is provided in a number corresponding to the plurality of louvers 116. That is, one louver motor is coupled to one louver 116. Accordingly, by selectively operating the plurality of louver motors, the plurality of louvers 116 may be independently operated.

More specifically, only one of the four louver motors may be operated so that only one louver 116 axially coupled thereto may be repeatedly rotated by a predetermined angle, and all the louvers 116 may be rotated by operating all four louver motors. There will be.

As a result, when the upper surface of the louver 116 and the air discharged through the discharge port 114 come into contact with each other, the contact angle between the louver 116 and the discharged air is changed every time by the rotation of the louver motor. The discharged air is forced to be discharged in various directions.

The motor cover 118 is provided at the upper edge portion of the front panel 110. The motor cover 118 is shielded so that the louver motor is not exposed to the upper side as the louver motor is installed in the upper edge portion of the front panel 110, four are provided in the same shape.

The drain pan 150 is provided above the front panel 110. The drain pan 150 is configured to collect the condensed water generated on the outer surface of the indoor heat exchanger (not shown) during the heat exchange with the refrigerant passing through the interior of the indoor heat exchanger (not shown) that exchanges indoor air with the refrigerant. As a result, the upper surface is recessed downward to form a water collecting space.

The drain pan 150 also serves to guide the air purified by the air filter 122 to flow upward through the drain pan 150.

That is, the through hole 154 is drilled in the center of the drain pan 150. Therefore, the indoor air can flow upward through the suction port 112 and the through hole 154.

An upper surface of the drain pan 150, more specifically, an upper side of the collecting space, is provided with an indoor heat exchanger as described above. The indoor heat exchanger is for heat-exchanging the indoor air purified by the air filter 122, and the refrigerant that exchanges heat with the indoor air flows therein.

Meanwhile, an orifice 180 is provided at the center of the drain pan 150. The orifice 180 serves to guide the air flowing upward from the lower side of the drain pan 150 to the center portion of the indoor fan 170, and has a cylindrical shape that increases in diameter downward. The lower end is coupled to be on the same plane as the bottom of the drain pan 150.

Therefore, when the indoor fan 170 rotates to generate a suction force downward, the air below is based on the drain pan 150 and flows upward through the orifice 180.

The plasma filter 190 is provided on the lower left side of the orifice 180. The plasma filter 190 generates plasma to charge and adsorb foreign substances contained in the air, and the front and rear ends are coupled to one side of the bottom surface of the orifice 180 by a fastening member.

The control box 196 is provided on the lower right side of the orifice 180. The control box 196 is a configuration for controlling the operation of the indoor unit 100, a predetermined size of space is formed inside the printed circuit board is generally built.

On the other hand, the suction grill 120 is coupled to be rotated in a downward direction based on one end of the front panel 110, by this coupling configuration the air filter 122 is detachable in the indoor unit (100).

Hereinafter, the coupling configuration of the suction grill 120 and the front panel 110 will be described in detail with reference to FIGS. 3 and 4.

Figure 3 is a bottom perspective view showing the front panel appearance of one configuration in the indoor unit of the cassette-type air conditioner according to the invention, Figure 4 is a front panel of one configuration in the indoor unit of the cassette-type air conditioner according to the present invention A top perspective view is shown showing its appearance.

As shown in these figures, the suction grill 120 is rotatably installed on the left side relative to the right end. That is, the hinge 126 is provided before and after the right end of the suction grill 120, the hinge is engaged with the hook portion 119 formed on the front panel 110.

And, the hinge is coupled by the elastic restoring force when coupled with the hook portion 119. Therefore, when the suction grill 120 is pulled downward in the state in which the left side of the suction grill 120 is opened downward, the suction grill 120 is detachable from the front panel 110.

In addition, the suction grill 120 is configured to be coupled to the front panel 110 by changing the left / right position. That is, the hinge is formed only at the right end of the suction grill 120, the hook portion 119 is formed on the left and right sides of the front panel 110, one pair each.

Therefore, even if the left / right positions are changed while the upper and lower surfaces of the suction grill 120 are maintained, the hinge can be coupled to the hook portion 119 formed on the upper left side of the front panel 110. This is to increase the installability of the suction grill 120.

According to the combination of the hinge and the hook portion 119, the suction grill 120 is rotatable with respect to the front panel (110).

On the other hand, the link assembly 200, which is a main component of the present invention, is provided on the opposite side of the hinge, that is, before and after the left side of the suction grill 120 in the longitudinal direction. The link assembly 200 is configured to prevent a sudden drop of the suction grill 120 when the suction grill 120 is opened and the air filter 122 is pulled out / inserted.

That is, the front and rear ends of the suction grill 120 is provided with a single link assembly 200, respectively, the upper end of the link assembly 200 is coupled to one side of the front panel 110, respectively, the suction grill ( 120 is supported by the front panel 110 through the link assembly 200 may be limited to the opening angle.

To this end, a support protrusion 210 which is coupled to the upper end of the link 220 and guides the rotation of the link 220 is provided inside the front panel 110, that is, inside / front of the suction port 112.

The support protrusion 210 is to be coupled to the link assembly 200 by the elastic restoring force to the hollow portion of the central portion is radially cut off (see Fig. 7).

Hereinafter, the configuration of the link assembly 200 will be described in detail with reference to FIGS. 5A to 7.

Figures 5a and 5b is a schematic view showing the configuration and operation of the embodiment of the link assembly constituting the main portion in the indoor unit of the cassette-type air conditioner according to the present invention, Figure 6a and 6b is a cassette-type air according to the present invention Figure is a schematic diagram showing the configuration and operation of another embodiment of the linkage assembly constituting the main portion in the indoor unit of the conditioner. 7 is a longitudinal cross-sectional view of the portion II ′ of FIG. 6B.

As shown in the drawing, the link assembly 200 is largely coupled to the support protrusion 210 formed on the front panel 110 and rotatable link 220, and a guide protrusion protruding upward from the suction grill 120. 240).

The link 220 is coupled to the front panel 110 by receiving the support protrusion 210 on the left side, and is coupled to the guide protrusion 240 on the right side. Then, the link 220 is rotated based on the support protrusion 210 and when the right side of the link 220 is inclined in the lower right direction as shown in Figure 5b, the suction grill 120 is the link 220 and the hinge The load is supported to limit the downward opening angle.

To this end, the link 220 is coupled to the support protrusion 210, the rotating part 222 which is the rotation center of the link 220, and protrudes outward from the outer peripheral surface of the rotating part 222 is the guide protrusion 240 It is configured to include a guide bar 224 to guide the sliding of).

The rotating part 222 has a cylindrical shape in which the center part is perforated in the front / rear direction, and the inner diameter corresponds to the outer diameter of the support protrusion 210. That is, as shown in FIG. 7, the inner diameter of the rotating part 222 has a size corresponding to an outer circumferential surface of the left side of the hook protrusion 212 formed at the right end of the support protrusion 210, and is smaller than the center portion of the hook protrusion 212. .

Therefore, when the hook protrusion 212 is moved in the right direction and inserted into the rotating part 222, the rotating part 222 is hooked with the hook protrusion 212 by elastic recovery of the hook protrusion 212. The guide bar 224 is rotatable based on the support protrusion 210.

A guide bar 224 is provided on the right side of the rotating part 222. The guide bar 224 has a substantially elliptic shape, the inside is provided with a guide hole 226 perforated in the front / rear direction. The upper end of the guide protrusion 240 is slidably coupled to the guide hole 226.

Therefore, when the suction grill 120 rotates while the end of the guide protrusion 240 is coupled to the inside of the guide hole 226, the guide protrusion 240 is based on the hinge as the suction grill 120. Rotate to interfere with the guide bar 224, and as the interference with the guide bar 224, the link 220 is rotated relative to the support protrusion 210.

On the other hand, the guide protrusion 240 is formed integrally with the suction grill 120 and protrudes upwardly of the suction grill 120. The upper end of the guide protrusion 240 is slidably defective in the guide hole 226 as described above.

That is, the left side surface of the upper end of the guide protrusion 240 is provided with a coupler 242 to be coupled to the guide bar 224 in a slidable state along the guide hole 226.

The coupler 242 is formed to have a stepped right side, and the stepped small outer diameter corresponds to the width of the guide hole 226. In addition, the upper left surface of the guide protrusion 240 is formed stepped to have a shape symmetrical with the coupler 242.

In addition, the coupler 242 is fastened by a fastening member such as the guide protrusion 240 and a screw in a state in which the right side is inserted into the guide hole 226.

Therefore, when the coupler 242 and the guide protrusion 240 are coupled, the guide protrusion 240 is slidable along the guide hole 226, and the link 220 is rotated when the suction grill 120 is rotated. Interfered with the guide protrusion 240 is rotatable.

On the other hand, as described above, the suction grill 120 may be assembled in various directions by rotating left / right with respect to the front panel 110, and according to the mounting position of the link assembly 200 and the suction grill 120. It is configured to be coupled with the front panel 110.

That is, the link assembly 200 allows the load of the suction grill 120 to be supported by the front panel 110 by the combination of the rotating unit 222 and the support protrusion 210 to increase the opening degree of the suction grill 120. The number of the supporting protrusions 210 is greater than the number of the link assembly 200 on the inner surface of the suction port 112.

In more detail, one support protrusion 210 is formed at each of the left and right sides of the front and rear surfaces of the inside of the suction port 112, and the suction grill 120 is rotated based on the right end as shown in FIG. 3. The link assembly 200 is coupled to the support protrusion 210 formed on the inner left side of the suction port 112.

On the contrary, when the suction grill 120 is coupled to rotate based on the left end, the link assembly 200 is coupled to the support protrusion 210 formed on the inner right side of the suction port 112.

Therefore, the link assembly 200 may be selectively coupled among the support protrusions 210 again for the convenience of opening the suction grill 120 according to the position of the indoor unit 100 installed.

Hereinafter, a process of coupling the link assembly configured as described above to the suction grill and the front panel will be described with reference to FIGS. 3 to 7.

First, in the state in which the link assembly 200 is separated, the link 220 and the guide protrusion 240 are coupled in a slidable state. That is, the upper end portion of the guide protrusion 240 is inserted into the guide hole 226, and the coupler 242 is fastened to the opposite surface of the guide protrusion 240 inserted into the guide hole 226. Will be combined.

When the fastening member is fastened, the guide protrusion 240 is not separated from the link 220 in a slidable state in the guide hole 226, and the link assembly 200 is coupled to the suction grill 120. Will be maintained.

Then, the suction grill 120 is inserted into the suction port 120 in a direction to be installed, and then the hinge 126 and the hook part 119 are combined to prevent the suction grill 120 from falling. That is, the suction grill 120 is fixed to be rotatable with respect to the hinge 126.

Then, when the hook protrusion 212 is strongly inserted into the rotating part 222, the hook protrusion 212 is retracted while generating an elastic restoring force, and then elastically recovered to restore the link assembly 200 as shown in FIG. Restraint from separation.

At this time, the link 220 is rotatable about the hook protrusion 212, the coupling of the link assembly is completed.

When the suction grill is opened in the state in which the link assembly is coupled, the suction grill can be rotated based on the hinge and the hook part, and the link assembly 200 includes the guide protrusion 240 and the guide bar 224 as shown in FIG. 5B. ) Is maintained in a long unfolded state by interference.

Therefore, the suction grill 120 is supported by a portion of the load on the front panel 110 by the link assembly 200, the opening angle to the front panel 110 can be limited.

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

For example, in one embodiment of the present invention, the guide protrusion 240 is configured to have a curved shape to the right, but is formed integrally with the suction grill 120 and coupled to the guide hole 226, the link 220 Of course, it is possible to change and apply to various shapes within the range that can be rotated (see Figs. 6a and 6b).

According to the present invention having the configuration as described above, the link assembly is provided on one side of the suction grill, so that one end of the link assembly is coupled to the front panel so that the opening angle of the suction grill can be limited.

Therefore, since the excessive opening of the suction grill is prevented in advance when the air filter is replaced, the physical injury of the user due to the fall of the air filter and the suction grill is prevented in advance.

In addition, there is an advantage that the convenience of use is improved compared to the process of replacing the air filter in the state in which the suction grill is supported by one hand in order to prevent excessive opening of the suction grill.

In the present invention, the link assembly is selectively detachable from the front panel, and the suction grill is configured to be coupled to the front panel in a left / right state.

Therefore, the installation position of the suction grill can be selectively changed according to the installation position of the indoor unit, and thus the installation property is improved.

Claims (9)

In the indoor unit of the cassette-type air conditioner fixed to the ceiling to coordinate the indoor air, A front panel formed with an inlet and an outlet to guide the intake and discharge of air; An air filter for filtering foreign matter from the air sucked through the suction port; A suction grill coupled to one side of the front panel to support an air filter; The indoor unit of the cassette type air conditioner is coupled to the suction grill and one side of the front panel comprises a link assembly for limiting the opening angle of the suction grill. The method of claim 1, wherein the link assembly, A link rotatably coupled to one side of the front panel and supporting a part of the load of the suction grill when the suction grill is opened; The indoor unit of the cassette-type air conditioner is formed on one side of the suction grill, and comprises a guide projection coupled to the link to limit the downward movement of the suction grill. The indoor unit of a cassette type air conditioner according to claim 2, wherein the guide protrusion is formed integrally with the suction grill. The method of claim 2, wherein the link, A rotating part coupled to one side of the front panel to become a rotation center of the link; The indoor unit of the cassette-type air conditioner, characterized in that it comprises a guide bar protruding outward from the rotating part to guide the sliding of the guide projection. The method of claim 4, wherein one side of the front panel is Indoor unit of the cassette-type air conditioner is coupled to the rotating unit is provided with a support projection for supporting the load of the link and the suction grill. The indoor unit of the cassette type air conditioner according to claim 5, wherein the support protrusion is elastically restored after being inserted into the rotating part to restrain the rotating part. According to claim 2, wherein the suction grill and one side of the front panel, The indoor unit of the cassette type air conditioner, characterized in that the hinge and the hook portion which is the rotation center of the suction grill with respect to the front panel is provided. 8. The indoor unit of a cassette type air conditioner according to claim 7, wherein the hinge is formed at a position opposite to the link assembly. The method of claim 5, wherein the support protrusion, Indoor unit of the cassette-type air conditioner, characterized in that the number formed more than the link assembly.

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