CN111928381B - Energy-conserving negative pressure processing system in hall in winter - Google Patents
Energy-conserving negative pressure processing system in hall in winter Download PDFInfo
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- CN111928381B CN111928381B CN202010658404.5A CN202010658404A CN111928381B CN 111928381 B CN111928381 B CN 111928381B CN 202010658404 A CN202010658404 A CN 202010658404A CN 111928381 B CN111928381 B CN 111928381B
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- room
- air conditioner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/20—Casings or covers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
- F24F7/065—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit fan combined with single duct; mounting arrangements of a fan in a duct
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Air-Flow Control Members (AREA)
Abstract
The invention relates to the technical field of negative pressure treatment, in particular to an energy-saving negative pressure treatment system for a lobby in winter, which has the technical scheme that: the energy-saving negative pressure treatment system for the lobby in winter can reduce energy waste caused by the negative pressure of the lobby.
Description
Technical Field
The invention relates to the technical field of negative pressure treatment, in particular to an energy-saving negative pressure treatment system for a lobby in winter.
Background
In winter, generally, heating air is supplied to halls of commercial buildings such as high-rise office buildings or hotels, gaps between high-rise staircases and gaps between elevators easily generate a chimney effect, so that the halls are in a negative pressure state, if the halls are opened at the moment, outdoor cold air can flow into the halls through the gates, the heating effect of the halls is greatly influenced, and if the heating amount of central air conditioning to the halls is increased, a large amount of energy is wasted.
Disclosure of Invention
In order to reduce the energy waste that leads to because of the negative pressure in hall, this application provides an energy-conserving negative pressure processing system in hall in winter.
The application provides a winter hall energy-conserving negative pressure processing system adopts following technical scheme:
an energy-saving negative pressure treatment system for a lobby in winter comprises the lobby, an air conditioner room and a breathing room;
the air conditioner room is provided with an opening and closing pipe and is connected with the hall through the opening and closing pipe;
an adjusting room is connected between the breathing room and the air conditioner room, the adjusting room is provided with openings at two ends, the openings at two ends of the adjusting room are communicated with each other, the openings at two ends of the adjusting room respectively face the breathing room and the air conditioner room, an adjusting plate is arranged in the adjusting room in a sliding manner, a plurality of outer walls of the adjusting plate are fitted with a plurality of inner walls of the adjusting room one by one, and a power device for enabling the adjusting plate to move towards the breathing room is arranged in the air conditioner room;
a one-way pipe is connected between the breathing room and the air conditioner room, a one-way valve is arranged in the one-way pipe, and the one-way valve allows air in the breathing room to enter the air conditioner room;
the breathing room is provided with an outer through pipe communicated with the air outside the hall.
Through adopting above-mentioned technical scheme, earlier open and close the pipe and close, then utilize power device to make the regulating plate remove toward the direction of breathing the room, the air in the room of breathing this moment is crowded into air conditioner room through the one-way pipe in, because the air conditioner in the air conditioner room can dispel the heat at the course of the work, consequently, the air that enters into in the air conditioner room absorbs certain heat, when opening and close the pipe and open, air conditioner room and lobby intercommunication, if the lobby is in negative pressure state, because the regulation room communicates with the room of breathing this moment, and breathe room and outside air intercommunication, consequently, the regulating plate has the trend that moves toward air conditioner room in order to supply the lobby with the air in the air conditioner room in, make lobby and lobby outside atmospheric pressure keep unanimous, through the reciprocating motion of regulating plate and opening and closing repeatedly of pipe, reduce the energy waste because of the negative pressure in lobby and lead to.
Preferably, the opening of the opening and closing pipe facing the air conditioner room can be covered with a pipe cover, a support is further arranged on the side wall of the air conditioner room, which is provided with the opening and closing pipe, and a cylinder for controlling the pipe cover to be close to or far away from the opening and closing pipe is arranged on the support.
Through adopting above-mentioned technical scheme, through the removal of cylinder control tube cap to the opening and close of quick control open and close pipe.
Preferably, the end face of the opening and closing pipe facing the pipe cover is provided with an annular caulking groove, the end face of the pipe cover facing the opening and closing pipe is provided with an annular flange, and the flange is matched with the caulking groove relatively.
Through adopting above-mentioned technical scheme, when the tube cap lid closes the terminal surface of opening and close the pipe, the flange embedding caulking groove in, increased the tube cap and opened and close the sealing area between the pipe, improved the leakproofness of opening and close between pipe and the tube cap.
Preferably, the support comprises a plurality of supporting rods perpendicular to the side wall of the air conditioner room, a supporting plate is arranged between the supporting rods, the air cylinder is arranged on the supporting plate, one end, away from the opening and closing pipe, of the pipe cover is connected with a guide rod, a guide hole is formed in the supporting plate, and the guide rod is matched with the guide hole in a relative mode.
Through adopting above-mentioned technical scheme, the setting of guide bar and guiding hole plays the guide effect to the removal of tube cap, reduces the skew that the tube cap takes place at the removal in-process.
Preferably, power device includes the casing, the lateral wall at air conditioner room is fixed to the casing, set up the cavity that is the rectangle in the casing, the cavity internal rotation is provided with the screw rod, the axis of screw rod is parallel with the direction of sliding of regulating plate, the internal slip of cavity is provided with the spiral shell piece, spiral shell piece and screw rod threaded connection, the one end of casing is provided with the motor, the output shaft of motor and the one end that the regulating plate was kept away from to the screw rod are connected, the spiral shell piece is connected with the slide bar, the slide bar runs through the one end of casing towards the regulating plate, the outer end of slide bar is connected with the push pedal.
Through adopting above-mentioned technical scheme, the screw rod in the motor drive casing rotates, and the rotation of screw rod makes the spiral shell piece slide in the casing, and the spiral shell piece passes through the slide bar and drives the push pedal and remove, and the push pedal of removal can be close to or keep away from the regulating plate, and the in-process that is close to the regulating plate in the push pedal, the push pedal can promote the regulating plate and make the regulating plate toward the direction removal of breathing the room to make fast the air in breathing the room crowd into air conditioner room through the check pipe.
Preferably, be both ends open-ended rectangle box form between the regulation, all seted up the spout, two between the relative both sides wall in the regulation the length direction of spout all is parallel with the horizontal direction, the both sides lateral wall of regulating plate corresponds two spouts respectively and has seted up the slider.
Through adopting above-mentioned technical scheme, through the slip of slider in the spout for the regulating plate slides in adjusting within a definite time.
Preferably, a filter screen is arranged in the outer through pipe.
Through adopting above-mentioned technical scheme, the setting of filter screen can filter the air that gets into in the breathing room to play the filter effect to the air that supplyes in the hall.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the energy-saving negative pressure treatment system for the lobby in winter can lead the outside air into the air conditioner room through the breathing room and the one-way pipe, and the air in the air conditioner room can absorb the heat emitted by the air conditioner, and then the air in the air conditioner room can be supplemented into the lobby through the reciprocating motion of the adjusting plate and the repeated opening and closing of the opening and closing pipe, so that the air pressure outside the lobby is kept consistent, and the energy waste caused by the negative pressure of the lobby is reduced;
2. when the pipe cover covers the end face of the opening and closing pipe, the flange is embedded into the caulking groove, the sealing area between the pipe cover and the opening and closing pipe is increased, and the sealing performance between the opening and closing pipe and the pipe cover is improved;
3. the setting of filter screen can filter the air that gets into in the room of breathing to play the filter effect to the air that supplyes in the hall.
Drawings
FIG. 1 is an overall schematic view of an energy-saving negative pressure treatment system of a farm machinery hall in the embodiment of the application;
FIG. 2 is a partial structural sectional view of an energy-saving negative pressure treatment system of a farm machinery hall in the embodiment of the application;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a partially enlarged view at B in fig. 2.
Description of reference numerals: 1. a hall; 2. an air conditioner room; 21. an air conditioner; 211. a heating pipe; 22. opening and closing the tube; 221. caulking grooves; 23. a tube cover; 231. a flange; 232. a guide bar; 233. a guide hole; 24. a support; 241. a strut; 242. a support plate; 25. a cylinder; 3. a respiratory chamber; 4. a regulating room; 41. an adjusting plate; 42. a chute; 43. a slider; 5. a power plant; 51. a housing; 52. a screw; 53. a screw block; 54. a motor; 55. a slide bar; 56. pushing the plate; 6. a one-way tube; 61. a one-way valve; 7. an outer communicating pipe; 71. and (4) a filter screen.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses energy-conserving negative pressure processing system in hall in winter. Referring to fig. 1, energy-conserving negative pressure processing system in lobby 1 includes lobby 1, air conditioner room 2 and breathing room 3 winter, and air conditioner room 2 and breathing room 3 all establish in lobby 1 with one side, and air conditioner room 2 and breathing room 3 all are the rectangle room form. Referring to fig. 2, an air conditioner 21 is installed in the air conditioner room 2, the air conditioner 21 is connected to the room of the hall 1 through a heating pipe 211, and the air conditioner 21 supplies heating air to the hall 1 through the heating pipe 211.
Referring to fig. 2, air conditioner room 2 is provided with opening and closing pipe 22, and opening and closing pipe 22 is the cylinder tubulose, and opening and closing pipe 22 runs through lobby 1's lateral wall and air conditioner room 2's lateral wall simultaneously, and air conditioner room 2 is connected with lobby 1 through opening and closing pipe 22. Further, referring to fig. 3, an opening of the opening/closing pipe 22 facing the air conditioner room 2 may be covered with a pipe cover 23, and the shape of the pipe cover 23 corresponds to the opening of the opening/closing pipe 22 and is circular. The end face of the opening and closing pipe 22 facing the pipe cover 23 is provided with an annular caulking groove 221, the end face of the pipe cover 23 facing the opening and closing pipe 22 is provided with an annular flange 231, the flange 231 is matched with the caulking groove 221 relatively, when the pipe cover 23 covers the end face of the opening and closing pipe 22, the flange 231 is embedded into the caulking groove 221, the sealing area between the pipe cover 23 and the opening and closing pipe 22 is increased, and the sealing performance between the opening and closing pipe 22 and the pipe cover 23 is improved.
Referring to fig. 2 and 3, a bracket 24 is further disposed on a side wall of the air conditioner room 2 where the opening and closing pipe 22 is disposed, and a cylinder 25 for controlling the pipe cover 23 to be close to or far from the opening and closing pipe 22 is disposed on the bracket 24. The cylinder 25 controls the movement of the tube cover 23, thereby rapidly controlling the opening and closing of the opening and closing tube 22. Specifically, the bracket 24 includes a plurality of struts 241 perpendicular to the side wall of the air conditioner room 2, a support plate 242 is disposed between the plurality of struts 241, and the cylinder 25 is disposed on the support plate 242. One end of the tube cover 23, which is far away from the opening and closing tube 22, is connected with two guide rods 232, the support plate 242 is provided with two guide holes 233 at intervals, the two guide rods 232 are respectively matched with the two guide holes 233 oppositely, and the arrangement of the guide rods 232 and the guide holes 233 plays a role in guiding the movement of the tube cover 23, so that the offset of the tube cover 23 in the moving process is reduced.
Referring to fig. 2 and 4, a regulating room 4 is connected between the breathing room 3 and the air conditioner room 2, the regulating room 4 is provided with openings at two ends, the openings at two ends of the regulating room 4 are communicated with each other, and the openings at two ends of the regulating room 4 respectively face the breathing room 3 and the air conditioner room 2. An adjusting plate 41 is arranged in the adjusting room 4 in a sliding manner, and a plurality of outer walls of the adjusting plate 41 are attached to a plurality of inner walls of the adjusting room 4 one by one. Specifically, adjust room 4 and be rectangle box form, the regulating block corresponds the shape of adjusting room 4 and is rectangular plate form, spout 42 has all been seted up between the relative both sides wall of level in the adjust room 4, spout 42 is the rectangle groove form, the length direction of two spout 42 all is parallel with the horizontal direction, the both sides lateral wall of regulating plate 41 corresponds two spout 42 respectively and has seted up slider 43, slide in spout 42 through slider 43 for regulating plate 41 slides in adjusting room 4.
With continued reference to fig. 2 and 4, a power device 5 for moving the adjusting plate 41 toward the breathing room 3 is disposed in the air conditioner room 2, the power device 5 includes two shells 51, each of the two shells 51 is in a rectangular shell shape, and the two shells 51 are respectively fixed on two side walls horizontally opposite to each other in the air conditioner room 2. A rectangular cavity is formed in the shell 51, a screw 52 is rotatably arranged in the cavity, the axis of the screw 52 is parallel to the sliding direction of the adjusting plate 41, a screw block 53 is slidably arranged in the cavity, the screw block 53 is rectangular, the side wall of the screw block 53 is attached to the inner side wall of the shell 51, and the screw block 53 is in threaded connection with the screw 52. One end of the shell 51 is provided with a motor 54, an output shaft of the motor 54 is connected with one end of the screw 52 far away from the adjusting plate 41, one end of the screw block 53 is connected with two sliding rods 55, the two sliding rods 55 on the same screw block 53 are arranged at intervals, the length direction of the sliding rods 55 is parallel to the axis of the screw 52, and the sliding rods 55 penetrate through one end of the shell 51 facing the adjusting plate 41. The outer end of the slide rod 55 is connected with a push plate 56, and the push plate 56 is rectangular plate-shaped. When power device 5 starts, screw 52 in motor 54 drive casing 51 rotates, and the rotation of screw 52 makes spiral piece 53 slide in casing 51, and spiral piece 53 drives push pedal 56 through slide bar 55 and removes, and the push pedal 56 of removal can be close to or keep away from regulating plate 41, and at the in-process that push pedal 56 is close to regulating plate 41, push pedal 56 can promote regulating plate 41 and make regulating plate 41 move toward the direction of breathing room 3.
Referring to fig. 2, a one-way pipe 6 is further connected between the breathing room 3 and the air conditioner room 2, the one-way pipe 6 is in a U-shaped tubular shape, two ends of the one-way pipe 6 are respectively communicated with the breathing room 3 and the one-way pipe 6, a one-way valve 61 is arranged in the one-way pipe 6, and the one-way valve 61 supplies air in the breathing room 3 to enter the air conditioner room 2.
Referring to fig. 1, breathe room 3 and be provided with the outer siphunculus 7 with hall 1 outside air intercommunication, outer siphunculus 7 is the cylinder tubulose, is provided with filter screen 71 in the outer siphunculus 7, and the setting of filter screen 71 can filter the air that gets into in the room of breathing 3 to play the filter effect to supplementing the air in hall 1.
The implementation principle of the energy-conserving negative pressure processing system in hall in winter of the embodiment of this application is: the opening and closing pipe 22 is closed, then the power device 5 is used for enabling the adjusting plate 41 to move towards the breathing room 3, at the moment, the air in the breathing room 3 is extruded into the air conditioner room 2 through the one-way pipe 6, because the air conditioner 21 in the air conditioner room 2 can dissipate heat during operation, the air entering the air conditioner room 2 absorbs a certain amount of heat, when the opening and closing pipe 22 is opened, the air conditioner room 2 is communicated with the hall 1, if the hall 1 is in a negative pressure state, because the adjusting room 4 is communicated with the breathing room 3, and the breathing room 3 is communicated with the outside air, so the adjusting plate 41 has a tendency to move toward the air-conditioning room 2 to supplement the air in the air-conditioning room 2 into the hall 1, so that the air pressure of the hall 1 is kept consistent with the air pressure outside the hall 1, the energy waste caused by the negative pressure of the hall 1 is reduced by the reciprocating motion of the adjusting plate 41 and the repeated opening and closing of the opening and closing pipe 22.
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 (6)
1. The utility model provides a winter hall energy-conserving negative pressure processing system which characterized in that: comprises a hall (1), an air conditioner room (2) and a breathing room (3);
the air conditioner room (2) is provided with a starting and closing pipe (22), and the air conditioner room (2) is connected with the hall (1) through the starting and closing pipe (22);
an adjusting room (4) is connected between the breathing room (3) and the air conditioner room (2), the adjusting room (4) is provided with two end openings, the two end openings of the adjusting room (4) are communicated with each other, the two end openings of the adjusting room (4) face the breathing room (3) and the air conditioner room (2) respectively, an adjusting plate (41) is arranged in the adjusting room (4) in a sliding mode, a plurality of outer walls of the adjusting plate (41) are attached to a plurality of inner walls of the adjusting room (4) one by one, and a power device (5) enabling the adjusting plate (41) to move towards the breathing room (3) is arranged in the air conditioner room (2);
a one-way pipe (6) is further connected between the breathing room (3) and the air conditioner room (2), a one-way valve (61) is arranged in the one-way pipe (6), and the air in the breathing room (3) enters the air conditioner room (2) through the one-way valve (61);
the breathing room (3) is provided with an external through pipe (7) communicated with the external air of the hall (1); the opening of opening and closing pipe (22) towards air conditioner room (2) can be covered and closed pipe cover (23), air conditioner room (2) is equipped with one side lateral wall of opening and closing pipe (22) and still is provided with support (24), be equipped with on support (24) and control cylinder (25) that pipe cover (23) are close to or keep away from opening and closing pipe (22).
2. The energy-saving negative pressure treatment system for the winter lobby according to claim 1, wherein: the end face, facing the pipe cover (23), of the opening and closing pipe (22) is provided with an annular caulking groove (221), the end face, facing the opening and closing pipe (22), of the pipe cover (23) is provided with an annular flange (231), and the flange (231) is matched with the caulking groove (221) relatively.
3. The energy-saving negative pressure treatment system for the winter lobby according to claim 2, wherein: the support (24) comprises a plurality of supporting rods (241) perpendicular to the side wall of the air conditioner room (2), a supporting plate (242) is arranged between the supporting rods (241), the air cylinder (25) is arranged on the supporting plate (242), one end, deviating from the opening and closing pipe (22), of the pipe cover (23) is connected with a guide rod (232), a guide hole (233) is formed in the supporting plate (242), and the guide rod (232) is matched with the guide hole (233) relatively.
4. The energy-saving negative pressure treatment system for the winter lobby according to claim 1, wherein: power device (5) include casing (51), the lateral wall in air conditioner room (2) is fixed in casing (51), the cavity that is the rectangle has been seted up in casing (51), the cavity internal rotation is provided with screw rod (52), the axis of screw rod (52) is parallel with the direction of sliding of regulating plate (41), it is provided with spiral shell piece (53) to slide in the cavity, spiral shell piece (53) and screw rod (52) threaded connection, the one end of casing (51) is provided with motor (54), the output shaft of motor (54) is connected with the one end that regulating plate (41) were kept away from in screw rod (52), spiral shell piece (53) are connected with slide bar (55), slide bar (55) run through casing (51) towards the one end of regulating plate (41), the outer end of slide bar (55) is connected with push pedal (56).
5. The energy-saving negative pressure treatment system for the winter lobby according to claim 1, wherein: between the regulation (4) be both ends open-ended rectangle box form, spout (42), two have all been seted up between the relative both sides wall in between the regulation (4) the length direction of spout (42) all is parallel with the horizontal direction, slider (43) have been seted up to the both sides lateral wall of regulating plate (41) corresponding two spout (42) respectively.
6. The energy-saving negative pressure treatment system for the winter lobby according to claim 1, wherein: a filter screen (71) is arranged in the outer through pipe (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010658404.5A CN111928381B (en) | 2020-07-09 | 2020-07-09 | Energy-conserving negative pressure processing system in hall in winter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010658404.5A CN111928381B (en) | 2020-07-09 | 2020-07-09 | Energy-conserving negative pressure processing system in hall in winter |
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| Publication Number | Publication Date |
|---|---|
| CN111928381A CN111928381A (en) | 2020-11-13 |
| CN111928381B true CN111928381B (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010658404.5A Active CN111928381B (en) | 2020-07-09 | 2020-07-09 | Energy-conserving negative pressure processing system in hall in winter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001349588A (en) * | 2000-06-06 | 2001-12-21 | Taisei Corp | Negative pressure countermeasure equipment |
| CN210569045U (en) * | 2019-08-28 | 2020-05-19 | 深圳市和域城建筑设计有限公司 | Indoor negative pressure adjusting device |
| CN210568894U (en) * | 2019-08-23 | 2020-05-19 | 深圳市和域城建筑设计有限公司 | Ventilation system that hall negative pressure was handled |
-
2020
- 2020-07-09 CN CN202010658404.5A patent/CN111928381B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001349588A (en) * | 2000-06-06 | 2001-12-21 | Taisei Corp | Negative pressure countermeasure equipment |
| CN210568894U (en) * | 2019-08-23 | 2020-05-19 | 深圳市和域城建筑设计有限公司 | Ventilation system that hall negative pressure was handled |
| CN210569045U (en) * | 2019-08-28 | 2020-05-19 | 深圳市和域城建筑设计有限公司 | Indoor negative pressure adjusting device |
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|---|---|
| CN111928381A (en) | 2020-11-13 |
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