CN216244694U

CN216244694U - Indoor ventilation system

Info

Publication number: CN216244694U
Application number: CN202120920196.1U
Authority: CN
Inventors: 关超
Original assignee: Beijing Green Bass Decoration Engineering Co ltd
Current assignee: Beijing Green Bass Decoration Engineering Co ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2022-04-08
Anticipated expiration: 2031-04-29

Abstract

The application relates to an indoor ventilation system, which comprises a main body mechanism and a cleaning mechanism, wherein the main body mechanism comprises an air inlet pipe, and the opening of the air inlet pipe is positioned on the indoor upper end surface; the cleaning mechanism comprises a mounting frame, the mounting frame is arranged at the lower end of an opening of the air inlet pipe and is mutually communicated with the inside of the mounting frame, a rectangular through hole is formed in the side wall of the outer side of the mounting frame, a drawer is arranged in the rectangular through hole, the size of the outer peripheral surface of the drawer is matched with the size of the inside of the mounting frame, the upper end surface and the lower end surface of the drawer are of an opening structure, an air filter is clamped in the drawer, and the size of the outer peripheral surface of the air filter is matched with the size of the inner wall of the drawer; this application has the effect of purifying and protection personnel's health safety to letting in indoor air.

Description

Indoor ventilation system

Technical Field

The application relates to the field of air circulation equipment, in particular to an indoor ventilation system.

Background

At present, an indoor ventilation device is a device which discharges indoor dirty air and inputs outdoor fresh air. Indoor ventilation unit all is equipped with vent and air exit on every layer of building in the existing market, adopts this kind of setting to discharge indoor dirty gas directly, inputs the air of external simultaneously to indoor, keeps the room air fresh.

Present china utility model as bulletin number is CN204629906U discloses an indoor ventilation unit, an indoor ventilation unit is applied to the building including a plurality of floors, the wall body on building top layer or the floor on building top layer is equipped with the air exit, indoor ventilation unit includes: the air inlet part, the air exhaust part and the ventilation part are used for communicating two adjacent floors; the air inlet part comprises an air inlet pipe communicated with the bottom layer of the building; the exhaust part comprises an exhaust fan matched with the exhaust outlet.

In view of the above-mentioned related art, the inventors have considered that the indoor ventilating device is not designed to purify air introduced into the room from the outside, so that harmful substances in the outside air may cause health risks to persons in the room.

SUMMERY OF THE UTILITY MODEL

In order better to let in indoor air and purify and protect personnel's health and safety, this application provides an indoor ventilation system.

The technical scheme provided by the application is as follows:

an indoor ventilation system comprises a main body mechanism and a cleaning mechanism, wherein the main body mechanism comprises an air inlet pipe, and an opening of the air inlet pipe is positioned on the indoor upper end face; clean mechanism includes the mounting bracket, the mounting bracket set up in intake pipe opening part lower extreme, and with the inside intercommunication each other of mounting bracket, the rectangle through-hole has been seted up to the lateral wall department in the mounting bracket outside, the inside drawer that is provided with of rectangle through-hole, the outer peripheral face size of drawer with the inside size looks adaptation of mounting bracket, the terminal surface is open structure about the drawer, the inside joint of drawer has air cleaner, air cleaner outer peripheral face size with drawer inner wall size looks adaptation.

Through adopting above-mentioned technical scheme, the open structure of terminal surface makes the drawer can not interfere gaseous normal flow about the drawer, the inside air cleaner of drawer can carry out omnidirectional purification treatment to gas, make the air after the purification can pass air cleaner's structure and continue downstream, but air cleaner joint is inside the drawer, and the drawer can take out to the mounting bracket outside at any time, thereby make things convenient for the staff to wash air cleaner, make air cleaner keep the purification effect to gas constantly, thereby reach the air purification and guarantee personnel's healthy and safe purpose.

Optionally, the air filter has a plurality of mesh filter layers therein.

Through adopting above-mentioned technical scheme, netted filter layer makes air cleaner can filter the harmful substance in the air, and the air after the filtration can continue downstream through air cleaner's network structure, and the residual substance in the air can be stayed in air cleaner's layer structure for the device can not interfere gaseous normal flow.

Optionally, the inside rigid coupling of port department of intake pipe has the annular frame, the outer peripheral face size of annular frame with the inner peripheral face size looks adaptation of intake pipe, the joint has the activated carbon board in the annular frame, the activated carbon board size with the inside size looks adaptation of annular frame.

Through adopting above-mentioned technical scheme, the activated carbon plate can closely the joint inside the ring frame for the activated carbon plate can realize quick assembly disassembly in the ring frame is inside, and the activated carbon plate can effectively adsorb the harmful particle in the intake pipe flowing gas, and the staff can regularly change the activated carbon plate, thereby keeps the adsorptivity of activated carbon plate to harmful substance in the gas.

Optionally, a plurality of through holes are vertically formed in the activated carbon plate.

Through adopting above-mentioned technical scheme, the through-hole of activated carbon plate terminal surface can make the air current accessible activated carbon plate's structure and continue downstream, and gas can carry out harmful substance's absorption to gas at the active carbon plate of flow in-process.

Optionally, a limiting plate is arranged on the lower end face of the drawer, and the outer peripheral surface of the limiting plate is fixedly connected to the inner wall of the mounting frame.

Through adopting above-mentioned technical scheme, the limiting plate can be injectd the drawer in the inside position of mounting bracket to play the supporting role to the drawer in the circumferencial direction, thereby increase the stability of drawer at mounting bracket internally mounted.

Optionally, the end face of the limiting plate is provided with a plurality of air holes.

Through adopting above-mentioned technical scheme, a plurality of gas pockets of limiting plate terminal surface make the limiting plate can not interfere gaseous normal flow to gaseous can pass the limiting plate and continue downward flow.

Optionally, the fixed intercommunication of the lower terminal surface of mounting bracket has the guiding subassembly, the guiding subassembly includes the guiding gutter, the inside hollow structure that is of guiding gutter, just guiding gutter up end opening size is greater than lower terminal surface opening size, the fixed intercommunication of the lower terminal surface opening part of guiding gutter has the honeycomb duct, global size of honeycomb duct with the less port size of guiding gutter is the same.

Through adopting above-mentioned technical scheme, the water conservancy diversion subassembly is used for setting for the gas flow direction, and gas can be followed from the great port department of guiding gutter to less port department moves, and gas can increase gaseous velocity of flow when the less port of guiding gutter to make gas can not flow back, and gas can continue to flow to subsequent device along the honeycomb duct.

Optionally, the honeycomb duct deviates from the port department of guiding gutter is provided with the new trend total heat exchanger, the new trend total heat exchanger's input with the tip of honeycomb duct communicates each other.

Through adopting above-mentioned technical scheme, the temperature of the air after the new trend total heat exchanger can be purified is adjusted, and the staff can externally adjust gaseous temperature, and the air is inside through the new trend total heat exchanger and export to the inside of floor through the output according to setting for the temperature, and the new trend total heat exchanger has better clean effect to the air to the new trend total heat exchanger cleans once more flowing air, guarantees gaseous cleanliness of export.

To sum up, the application comprises the following beneficial technical effects:

1. the air filter can purify air, and the air filter can be quickly assembled and disassembled in the drawer, so that workers can conveniently clean the air filter, the air filter can constantly keep the air purification effect, and the health and safety of indoor personnel are further ensured;

2. the activated carbon plate can adsorb harmful particles in the air, and can be quickly disassembled and assembled in the annular frame, so that the activated carbon plate can be periodically replaced;

3. the fresh air total heat exchanger can adjust the temperature of the purified air, and has a better cleaning effect on the air, so that the fresh air total heat exchanger cleans the flowing air again.

Drawings

Fig. 1 is a sectional view showing the structure of an indoor ventilating system.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a sectional view of the structure of the cleaning mechanism.

Fig. 4 is a sectional view of the internal structure of the mounting bracket.

In the figure, 1, a main body mechanism; 11. a floor; 12. an air intake assembly; 121. an air inlet cabinet; 122. an air inlet pipe; 123. an intake pump; 13. an air outlet assembly; 131. an air outlet cabinet; 132. an exhaust pipe; 133. discharging the air pump; 134. a cover plate; 14. a pipe silencer; 2. a cleaning mechanism; 21. a mounting frame; 211. mounting a plate; 22. an annular frame; 221. an activated carbon plate; 23. a drawer; 231. a handle; 232. a limiting plate; 24. an air filter; 25. a layer of leaves; 26. a flow guide assembly; 261. a diversion trench; 262. a flow guide pipe; 27. a fresh air total heat exchanger; 28. and (5) placing the shelf.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses indoor ventilation system.

Referring to fig. 1, an indoor ventilating system includes a main body mechanism 1 and a cleaning mechanism 2.

Referring to fig. 1, the main body mechanism 1 includes a plurality of floors 11, the plurality of floors 11 are arranged perpendicular to the horizontal ground, and the floors 11 include a plurality of vertically arranged hollow rectangular floors, and the interval between each floor is the same, so that the floors 11 have better integrity.

Referring to fig. 1, an air inlet assembly 12 is disposed at an upper end surface of the uppermost floor 11, the air inlet assembly 12 is used for ventilating each floor 11, the air inlet assembly 12 includes an air inlet case 121, the air inlet case 121 is a hollow rectangle and is placed at the upper end surface of the uppermost floor 11, the air inlet case 121 is used for collecting air ventilating the interior of the floor 11, an air inlet pipe 122 is fixedly communicated with a side wall of the air inlet case 121, the air inlet pipe 122 is disposed along the height direction of a plurality of floors 11, the air inlet pipe 122 extends inwards in a gap above each floor 11, and an end portion of the air inlet pipe 122 penetrates through the upper end surface of the floor 11 and is located inside the floor 11, so that the air inside the air inlet case 121 can flow downwards along the air inlet pipe 122 and is introduced into each floor 11; in order to increase the flow rate of the gas, an intake pump 123 is disposed at a fixed communication position between the intake chassis 121 and the intake pipe 122, and the intake pump 123 is used for accelerating the gas inside the intake pipe 122, so that the gas inside the intake pipe 122 can uniformly enter different floors 11.

Referring to fig. 1, an air outlet assembly 13 is disposed at an upper end surface of the uppermost floor 11, and the air outlet assembly 13 is used for discharging the exhaust gas in each floor 11, so as to increase the cleanliness of the gas in each floor 11; the air outlet assembly 13 comprises an air outlet case 131, the air outlet case 131 is used for collecting and intensively discharging the waste gas in different floors 11, and the air outlet case 131 is hollow and rectangular and is placed on the upper end surface of the uppermost floor 11; an exhaust pipe 132 is fixedly communicated with the side wall of the air outlet case 131, the exhaust pipe 132 is arranged along the height direction of the floors 11, a plurality of end heads extend out of the inner side surface of the exhaust pipe 132, and each end head penetrates through the lower end surface of the corresponding floor 11 and is communicated with the interior of the floor 11; an air outlet pump 133 is arranged at a fixed communication position of the air outlet cabinet 131 and the exhaust pipe 132, and the air outlet pump 133 is used for accelerating the flow of the exhaust gas in the exhaust pipe 132, so that the exhaust gas of each floor 11 can rapidly flow downwards from the inside of the floor 11 and is converged into the exhaust pipe 132 for centralized treatment.

Referring to fig. 1 and 2, in order to protect people on the floor 11 from potential safety hazards when walking at the end of the exhaust pipe 132, cover plates 134 are disposed at a plurality of ends of the exhaust pipe 132, the cover plates 134 are circular and are matched with the end of the exhaust pipe 132 in size, and the cover plates 134 can tightly cover the ends of the exhaust pipe 132; a plurality of air holes are formed in the end face of the cover plate 134 and are uniformly distributed in the structure of the cover plate 134, air of the air holes is used for enabling waste gas to flow through the structure of the cover plate 134 and along the exhaust pipe 132, and safety of people walking in the floor 11 can be effectively protected; during operation, air pump 133 is opened to pressurize air in exhaust pipe 132, so that air can be rapidly replaced in floor 11.

Referring to fig. 3, in order to reduce noise pollution caused by the air inlet assembly 12 and the air outlet assembly 13 during operation, a plurality of pipe silencers 14 are disposed inside the air inlet pipe 122 and the air outlet pipe 132, each pipe silencer 14 is hollow and cylindrical, and the size of the outer peripheral surface of each pipe silencer 14 is matched with the size of the inside of the air inlet pipe 122 and the inside of the air outlet pipe 132, so that the outer peripheral surface of each pipe silencer 14 can be tightly abutted to the inner peripheral surfaces of the air inlet pipe 122 and the air outlet pipe 132, and a plurality of silencing holes are disposed on the outer peripheral surface of each pipe silencer 14, and are used for increasing the silencing effect of the pipe silencers 14 and reducing impact force caused by vibration generated by gas during flowing on the inner walls of the air inlet pipe 122 and the air outlet pipe 132; the plurality of pipe silencers 14 are disposed at the ports of the inlet pipe 122 and the outlet pipe 132, wherein the inlet pipe 122 and the outlet pipe 132 are respectively provided with the pipe silencers 14 in fixed communication with the inlet cabinet 121 and the outlet cabinet 131, and the ports of the inlet pipe 122 and the outlet pipe 132 of each floor 11 are provided with the pipe silencers 14, so that the silencing effect of each floor 11 in the air inlet or exhaust process is increased.

Referring to fig. 1 and 3, the cleaning mechanism 2 is used for cleaning the gas flowing into the floor 11 from the outside, so as to ensure the safety of people living inside the floor 11; the cleaning mechanism 2 comprises a mounting frame 21, the mounting frame 21 is a hollow rectangle, the upper end face and the lower end face of the mounting frame 21 are both provided with an opening structure, the opening center position of the upper end face of the mounting frame 21 and the center position of the port of the air inlet pipe 122 are positioned in the same straight line, and the mounting frame 21 is used for mounting a device for purifying air; mounting bracket 21's up end rigid coupling has mounting panel 211, and mounting panel 211 is the rectangle, and global size is greater than mounting bracket 21's terminal surface size, and mounting panel 211 threaded connection is in the terminal surface department of floor 11 for mounting bracket 21 can carry out quick dismantlement at the terminal surface of floor 11.

Referring to fig. 3 and 4, a circular through hole is formed in the upper end surface of the mounting plate 211, the inside of the mounting frame 21 is communicated with the air inlet pipe 122 through the circular through hole, the annular frame 22 is fixedly connected to the upper end surface of the circular through hole, the annular frame 22 is hollow and cylindrical, the upper end surface and the lower end surface of the annular frame 22 are both in an open structure, the size of the outer peripheral surface of the annular frame 22 is matched with the size of the inner peripheral surface of the air inlet pipe 122, so that the annular frame 22 can be located inside the air inlet pipe 122 in the mounting process of the mounting frame 21, the upper end surface of the mounting plate 211 is tightly abutted to the end surface of the floor 11, and air in the air inlet pipe 122 can enter the mounting frame 21 along the inside of the annular frame 22; the joint has activated carbon plate 221 in the annular frame 22, activated carbon plate 221's size and the inside size looks adaptation of annular frame 22, make activated carbon plate 221 can closely joint in the inside of annular frame 22, the inside vertical a plurality of through-holes that are provided with of activated carbon plate 221, the through-hole makes the inside of air current accessible activated carbon plate 221 and continues to flow towards mounting bracket 21 inside, activated carbon plate 221 can effectively adsorb the harmful particle in the intake pipe 122 flowing gas, the staff can change activated carbon plate 221 regularly, thereby keep activated carbon plate 221 to the adsorptivity of harmful substance in the gas.

Referring to fig. 3 and 4, a rectangular through hole is formed in the side wall of the outer side of the mounting frame 21, the width of the rectangular through hole is smaller than that of the mounting frame 21, a drawer 23 is arranged inside the rectangular through hole, the drawer 23 is a hollow rectangle, the opening direction is vertical upward, the size of the outer peripheral surface of the drawer 23 is matched with the size of the inside of the mounting frame 21, the size of the end surface of the drawer 23 is matched with that of the rectangular through hole, the drawer 23 can be installed inside the rectangular through hole of the mounting frame 21, the side wall of the mounting frame 21 can circumferentially support the drawer 23, and the lower end surface of the drawer 23 is of a hollow structure, so that the drawer 23 does not interfere with the normal flow of air; a handle 231 is fixedly connected to the outer end face of the drawer 23, the handle 231 protrudes out of the end face of the drawer 23, and a worker can pull the drawer 23 out of the mounting frame 21 by pulling the handle 231; the lower terminal surface department of drawer 23 is provided with limiting plate 232, and limiting plate 232 is the rectangle, and global size is the same with the inside size of mounting bracket 21, and the outer peripheral face rigid coupling of limiting plate 232 is in the inner wall department of mounting bracket 21, and the up end of limiting plate 232 and the lower terminal surface butt of drawer 23, limiting plate 232 can be injectd drawer 23 in the inside position of mounting bracket 21, and a plurality of gas pockets have been seted up to limiting plate 232's terminal surface for limiting plate 232 can not interfere gaseous normal flow.

Referring to fig. 3 and 4, an air filter 24 is clamped inside the drawer 23, the air filter 24 is rectangular, the size of the outer peripheral surface of the air filter 24 is matched with the size of the inner wall of the drawer 23, the thickness of the air filter 24 is smaller than that of the drawer 23, a plurality of net-shaped filter layers are arranged inside the air filter 24, so that the air filter 24 can filter harmful substances in the air, the filtered air can continue to move downwards through the structure of the air filter 24, and residual substances in the air can be retained in the layer structure of the air filter 24; during operation, the worker may periodically open the drawer 23 and clean the air filter 24 inside, thereby maintaining the adsorption of harmful substances in the air by the air filter 24.

Referring to fig. 4, the louver layer 25 is arranged inside the mounting frame 21, the louver layer 25 is rectangular and is matched with the inner size of the mounting frame 21, the louver layer 25 comprises a plurality of blades which are arranged in the same direction, the blade direction can be adjusted through external acting force, and the louver layer 25 is used for controlling the flow direction of gas, so that gas which does not move regularly flows towards the same direction under the effect of the louver layer 25, and the flowability of the gas entering a lower layer structure is increased.

Referring to fig. 3 and 4, a flow guide assembly 26 is fixedly communicated with the lower end surface of the mounting frame 21, and the flow guide assembly 26 is used for setting the gas flowing direction and enabling the gas to enter the lower-layer structure along the flow guide assembly 26; the flow guide assembly 26 comprises a flow guide groove 261, the inside of the flow guide groove 261 is of a hollow structure, the size of the upper end face of the flow guide groove 261 is the same as that of the lower end face of the mounting frame 21, the mounting frame 21 is fixedly communicated with the inside of the flow guide groove 261, the opening of the lower end face of the flow guide groove 261 is circular, and the size of the end face is smaller than that of the upper end face, so that gas can move from a larger port of the flow guide groove 261 to a smaller port, the flow rate of the gas can be increased when the gas passes through a smaller port of the flow guide groove 261, and the gas cannot flow back; the opening of the lower end face of the flow guide groove 261 is fixedly communicated with a flow guide pipe 262, the size of the peripheral surface of the flow guide pipe 262 is the same as that of the smaller port of the flow guide groove 261, and gas in the flow guide groove 261 can continuously flow along the inside of the flow guide pipe 262.

Referring to fig. 3, the port department that honeycomb duct 262 deviates from guiding gutter 261 is provided with new trend total heat exchanger 27, new trend total heat exchanger 27 is the rectangle, and set up in the inside of floor 11, new trend total heat exchanger 27's input communicates with honeycomb duct 262's tip each other, make the inside air that flows of honeycomb duct 262 can get into new trend total heat exchanger 27, new trend total heat exchanger 27 can adjust the temperature of the air after purifying, thereby the staff can externally adjust gaseous temperature, make the air from new trend total heat exchanger 27 inside can be exported to the inside of floor 11 through the output according to setting for the temperature, and new trend total heat exchanger 27 has better clean effect to the air, thereby new trend total heat exchanger 27 carries out the secondary to the air that flows clean, guarantee the cleanliness of export gas.

Referring to fig. 3, for better fixing the position of the fresh air total heat exchanger 27 in the floor 11, the end face of the floor 11 is fixedly connected with a placing rack 28, a certain gap is formed between the rectangular end face of the placing rack 28 and the end face of the floor 11, and the gap height is matched with the height of the fresh air total heat exchanger 27, so that the fresh air total heat exchanger 27 can be placed in the gap between the placing rack 28 and the floor 11, the placing rack 28 can support the fresh air total heat exchanger 27, and the fresh air total heat exchanger 27 can output clean air to the inside of the floor 11 in the horizontal direction, thereby increasing the indoor ventilation effect.

The implementation principle of an indoor ventilation system of the embodiment of the application is as follows: during operation, the staff can turn on the intake pump 123 and the exhaust pump 133, air can be input into the floor 11 through the intake pipe 122, and air inside the floor 11 can be output to the outside along the exhaust pipe 132, so that the air inside the floor 11 and the air of the external environment circulate, and the indoor air circulates.

In the process that the outside air enters the floor 11 through the air inlet pipe 122, the activated carbon plate 221 can adsorb harmful particles in the air, and the purified air can pass through gaps on the surface of the activated carbon plate 221 and move downwards; the air can be further cleaned in the air filter 24, harmful substances in the air can be left in the internal structure of the air filter 24, and a worker can open the drawer 23 periodically and take out the internal air filter 24 for cleaning, so that the air purifying effect of the air filter 24 is kept at all times; gas through secondary purification can follow guiding gutter 261 and honeycomb duct 262 and get into the whole heat exchanger 27 of new trend, the whole heat exchanger 27 adjustable gas's of new trend output temperature to play the cooling or intensification effect to indoor air, and the whole heat exchanger 27 of new trend can further purify the remaining harmful substance in the air, thereby guarantee to export to indoor air and keep higher cleanliness, and then increase floor 11 inside personnel's health and safety.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An indoor ventilation system, includes main part mechanism (1) and clean mechanism (2), its characterized in that: the main body mechanism (1) comprises an air inlet pipe (122), and an opening of the air inlet pipe (122) is positioned on the indoor upper end face; clean mechanism (2) include mounting bracket (21), mounting bracket (21) set up in intake pipe (122) opening part lower extreme, and with mounting bracket (21) inside intercommunication each other, the rectangle through-hole has been seted up to the lateral wall department in mounting bracket (21) outside, and rectangle through-hole is inside to be provided with drawer (23), the outer peripheral face size of drawer (23) with mounting bracket (21) inside size looks adaptation, the terminal surface is open structure about drawer (23), drawer (23) inside joint has air cleaner (24), air cleaner (24) outer peripheral face size with drawer (23) inner wall size looks adaptation.

2. An indoor ventilation system as claimed in claim 1, wherein: the air filter (24) is internally provided with a plurality of reticular filter layers.

3. An indoor ventilation system as claimed in claim 1, wherein: inside rigid coupling in the port department of intake pipe (122) has annular frame (22), the outer peripheral face size of annular frame (22) with the inner peripheral face size looks adaptation of intake pipe (122), the joint has activated carbon plate (221) in annular frame (22), the size of activated carbon plate (221) with annular frame (22) inside size looks adaptation.

4. An indoor ventilation system as claimed in claim 3, wherein: a plurality of through holes are vertically arranged in the activated carbon plate (221).

5. An indoor ventilation system as claimed in claim 1, wherein: the lower terminal surface department of drawer (23) is provided with limiting plate (232), the outer peripheral face rigid coupling of limiting plate (232) in the inner wall department of mounting bracket (21).

6. An indoor ventilation system as claimed in claim 5, wherein: the end face of the limiting plate (232) is provided with a plurality of air holes.

7. An indoor ventilation system as claimed in claim 1, wherein: the fixed intercommunication of the lower terminal surface of mounting bracket (21) has water conservancy diversion subassembly (26), water conservancy diversion subassembly (26) include guiding gutter (261), the inside hollow structure that is of guiding gutter (261), just guiding gutter (261) up end opening size is greater than lower terminal surface opening size, the fixed intercommunication of lower terminal surface opening part of guiding gutter (261) has honeycomb duct (262), the global size of honeycomb duct (262) with the less port size of guiding gutter (261) is the same.

8. An indoor ventilation system as claimed in claim 7, wherein: honeycomb duct (262) deviate from the port department of guiding gutter (261) is provided with fresh air total heat exchanger (27), the input of fresh air total heat exchanger (27) with the tip of honeycomb duct (262) communicates with each other.