CN215637697U - Variable air volume system adjusting terminal and variable air volume air conditioning system - Google Patents
Variable air volume system adjusting terminal and variable air volume air conditioning system Download PDFInfo
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- CN215637697U CN215637697U CN202121093383.3U CN202121093383U CN215637697U CN 215637697 U CN215637697 U CN 215637697U CN 202121093383 U CN202121093383 U CN 202121093383U CN 215637697 U CN215637697 U CN 215637697U
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 21
- 238000003303 reheating Methods 0.000 claims abstract description 27
- 230000001276 controlling effect Effects 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 17
- 238000005057 refrigeration Methods 0.000 abstract description 9
- 238000009423 ventilation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The utility model discloses an adjusting terminal of a variable air volume system and the variable air volume air conditioning system, relates to the field of heating ventilation air conditioners and aims to solve the problem that the variable air volume air conditioning system cannot simultaneously run a refrigeration mode and a heating mode. The air-volume-variable system adjusting tail end comprises an air-volume-variable tail end device and a reheating device, wherein the air-volume-variable tail end device is respectively connected with an air supply pipe, an indoor return air pipe and an air outlet pipe, the air supply pipe and the indoor return air pipe are communicated with the air outlet pipe through the air-volume-variable tail end device, the air supply pipe is used for guiding air flowing through a heat exchanger into the air-volume-variable tail end device, the return air pipe is used for guiding indoor air into the air outlet pipe, and the air outlet pipe is used for guiding mixed air in the air-volume-variable tail end device out; the reheating device is arranged in a circulating channel between the indoor return air pipe and the air outlet pipe. The utility model is used for adjusting indoor air parameters.
Description
Technical Field
The utility model relates to the field of heating ventilation air conditioners, in particular to an adjusting tail end of an air-variable system and the air-variable air-conditioning system.
Background
The heating ventilation air conditioner is a system for processing the temperature, the humidity, the cleanliness and the airflow speed of indoor air by a manual method. With the increasing indoor Air environment, Variable Air Volume (VAV) Air conditioning systems gradually enter shopping malls and families.
In the prior art, the variable air volume air conditioning system can automatically adjust the air volume of the air conditioning system while keeping constant air supply temperature by changing the frequency of an air supply fan and the opening degree of an air door of an air supply duct according to the change of indoor load or the change of indoor required parameters, so that the indoor parameters can meet the required full air conditioning system.
However, the existing variable air volume air conditioning system cannot meet the requirement of simultaneously supplying cold and heat in a system area.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an adjusting terminal of a variable air volume system and the variable air volume air conditioning system, and aims to solve the problem that the variable air volume air conditioning system cannot simultaneously run a refrigeration mode and a heating mode.
In order to achieve the above purpose, the embodiment of the utility model adopts the following technical scheme:
on one hand, the embodiment of the utility model provides an air volume variable system adjusting terminal, which comprises an air volume variable terminal device and a reheating device, wherein the air volume variable terminal device is respectively connected with an air supply pipe, an indoor return air pipe and an air outlet pipe, the air supply pipe and the indoor return air pipe are communicated with the air outlet pipe through the air volume variable terminal device, the air supply pipe is used for guiding air flowing through a heat exchanger into the air volume variable terminal device, the return air pipe is used for guiding indoor air, and the air outlet pipe is used for guiding mixed air in the air volume variable terminal device; the reheating device is arranged in a circulating channel between the indoor return air pipe and the air outlet pipe.
Optionally, a first electric air valve is arranged in the air supply pipe, and a second electric air valve is arranged in the indoor return air pipe;
the air quantity controller is respectively connected with the first electric air valve and the second electric air valve and is used for respectively controlling the opening degrees of the first electric air valve and the second electric air valve.
Optionally, a first variable frequency fan is arranged in the indoor return air pipe, and the air quantity controller is connected with the first variable frequency fan and used for controlling the rotating speed of the first variable frequency fan.
Optionally, a second variable frequency fan is arranged in the air outlet pipe, and the air quantity controller is connected with the second variable frequency fan and used for controlling the rotating speed of the second variable frequency fan.
Optionally, an air volume collector is further arranged in the air supply pipe, and the air volume controller is connected with the air volume collector and used for acquiring air pressure in the air supply pipe.
Optionally, the air conditioner further comprises a temperature controller connected with the air volume controller and used for outputting a temperature control signal to the air volume controller.
Optionally, a temperature sensor is further arranged in the temperature controller and used for collecting indoor temperature.
Optionally, the temperature controller is further connected to the reheating device, and is used for controlling the temperature of the reheating device.
Optionally, the reheating device is arranged in the air outlet pipe.
On the other hand, an embodiment of the present invention further provides a variable air volume air conditioning system, including:
an air heat pump;
the air conditioner outdoor box is provided with an air inlet and an air outlet, a heat exchanger and an air supply fan are sequentially arranged between the air inlet and the air outlet, and the heat exchanger is used for circularly exchanging heat with the air heat pump;
wherein, the air outlet communicates a plurality of blast pipes of the last aspect of variable air volume regulation.
In the variable air volume air conditioning system and the adjusting terminal thereof, when the variable air volume air conditioning system operates, a part of air flows through the heat exchanger and then enters the variable air volume terminal device through the air delivery and distribution pipe, meanwhile, indoor air also enters the variable air volume terminal device through the indoor return air pipe, in the variable air volume terminal device, the indoor air and the air flowing through the heat exchanger are uniformly mixed and then are guided into a room through the air outlet pipe, and in the air circulation process, the reheating device arranged in the circulating channel between the indoor return air pipe and the air outlet pipe can heat the flowing air.
Thus, when the heat exchanger is in a refrigeration working condition, the air flowing through the heat exchanger is cooled into cold air, the cold air enters the variable air volume terminal device and is uniformly mixed with indoor circulating air, the cold air is led out through the air outlet pipe to flow into the room and cool the room, and at the moment, the adjusting terminal of the variable air volume system is in a refrigeration mode; if the reheating device is turned on at the same time, the air flowing through the reheating device is heated, and then the hot air flowing into the room through the air outlet pipe is used for heating the room, at the moment, the adjusting tail end of the variable air volume system is in a heating mode, and the working condition state of the heat exchanger does not need to be changed. Therefore, the variable air volume air conditioning system provided with the plurality of variable air volume system adjusting terminals can meet the requirements of cooling and heating at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of a second variable frequency fan at the adjusting end of an air volume varying system according to an embodiment of the present invention, which is disposed in an air outlet pipe;
fig. 2 is a schematic structural view of a first variable frequency fan at the regulation end of the variable air volume system in the embodiment of the utility model, which is arranged in an indoor return air duct.
Reference numerals:
1-variable air volume end device; 11-blast pipe; 12-indoor return air duct; 13-air outlet pipe; 2-a reheating device; 31-a first electrically operated air valve; 31-a second electrically operated air valve; 4-air volume controller; 51-a first variable frequency fan; 52-a second variable frequency fan; 6-air volume collector; 7-temperature controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more and "plural groups" means two or more groups unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In one aspect, the present invention provides a variable air volume system regulation end, as shown in fig. 1 and 2, comprising a variable air volume end device 1 and a reheating device 2.
The variable air volume end device 1 is respectively connected with an air supply pipe 11, an indoor air return pipe 12 and an air outlet pipe 13, and the air supply pipe 11 and the indoor air return pipe 12 are communicated with the air outlet pipe 13 through the variable air volume end device 1; the supply duct 11 serves for the introduction of air flowing through the heat exchanger into the variable air volume end unit 1, the return duct for the introduction of room air, and the outlet duct 13 for the discharge of mixed air in the variable air volume end unit 1.
The reheating device 2 is arranged in an indoor circulating channel between the return air pipe and the air supply pipe and used for heating circulating air in the indoor circulating channel.
In the embodiment of the utility model, when the adjusting end of the variable air volume system operates, a part of air flows through the heat exchanger and then enters the variable air volume end device 1 through the air delivery pipe, meanwhile, the indoor air also enters the variable air volume end device 1 through the indoor return air pipe 12, in the variable air volume end device 1, the indoor air and the air flowing through the heat exchanger are uniformly mixed and then are guided into a room through the air outlet pipe 13, and in the air circulation process, the reheating device 2 arranged in the circulating channel between the indoor return air pipe 12 and the air outlet pipe 13 can heat the flowing air.
Thus, when the heat exchanger is in a refrigeration working condition, the air flowing through the heat exchanger is cooled into cold air, the cold air enters the variable air volume end device 1 and is uniformly mixed with indoor circulating air, the cold air is led out through the air outlet pipe 13 and flows into the room, and the temperature of the room is reduced, and at the moment, the adjusting end of the variable air volume system is in a refrigeration mode; if the reheating device 2 is turned on at the same time, the air flowing through the reheating device 2 is heated, and then the hot air flowing into the room through the air outlet pipe 13 is used for heating the room, at this time, the adjusting end of the variable air volume system is in the heating mode, and the working condition state of the heat exchanger does not need to be changed. Therefore, the variable air volume air conditioning system provided with the plurality of variable air volume system adjusting terminals can meet the requirements of cooling and heating at the same time.
It should be noted that the variable air volume end device 1 is a conventional device of a variable air volume system, and has an appearance similar to a closed box body, two air inlets and one air outlet are formed in the box body, and different air flows can be fully and uniformly mixed in the process that the air flows from the two air inlets to the air outlet through the space between the air inlets and the air outlet.
In addition, in order to avoid airflow disturbance noise during the process of mixing the airflow in the variable air volume end device 1, a static pressure conversion device is provided in the variable air volume end device 1 for converting the dynamic pressure of the airflow in the variable air volume end device 1 into the static pressure airflow, thereby reducing the airflow noise during the air mixing process.
In some embodiments, as shown in fig. 2, a first electric air valve 31 is disposed in the air supply pipe 11, and a second electric air valve 32 is disposed in the indoor air return pipe 12, so that the ratio of the air flowing through the heat exchanger and the indoor air entering the variable air volume end device 1 can be controlled by controlling the opening degrees of the first electric air valve 31 and the second electric air valve 32, respectively, so that the mixed air is adjusted to a desired preset temperature and then is sent into the room through the air outlet pipe 13.
Specifically, as shown in fig. 2, the regulation end of the variable air volume system further includes an air volume controller 4, which is respectively connected to the first electric air valve 31 and the second electric air valve 32, and is used for respectively controlling the opening of the first electric air valve 31 and the opening of the second electric air valve 32.
With reference to fig. 2, a first variable frequency fan 51 is disposed in the indoor return air duct 12, at this time, the first variable frequency fan 51 is in a parallel state with the blast pipe 11, the air flowing from the blast pipe 11 does not pass through the first variable frequency fan 51, and the first variable frequency fan 51 can keep an operating state when the indoor air is in a circulating state, so as to ensure a minimum circulating air volume at the regulation end of the variable air volume system, and can also keep an operating state when the regulation end of the variable air volume system is in a heat supply demand. The air volume controller 4 is connected to the first variable frequency fan, and is configured to control a rotation speed of the first variable frequency fan 51.
In addition, as shown in fig. 1, in another embodiment, a second variable frequency fan 52 may be disposed in the air outlet pipe 13, at this time, the second variable frequency fan 52 is in a parallel state with the air supply pipe 11 and the indoor air return pipe 12, and the air flowing in from the air supply pipe 11 and the indoor air return pipe 12 passes through the second variable frequency fan 52; thus, the second variable frequency fan 52 is always operated when the variable air volume system regulating end is in the cooling condition. Wherein, the air volume controller 4 is connected with the second variable frequency fan 52 and is used for controlling the rotating speed of the second variable frequency fan 52.
Because the indoor return air inlet needs to be far away from the air outlet, the indoor return air inlet 12 is usually longer and is used for keeping the indoor return air inlet away from the air outlet at the adjusting end of the variable air volume system, and thus, the second variable frequency fan 52 at the air outlet pipe 13 is used for reducing the diameter size of the return air pipe, and equipment investment is saved.
It should be noted that, in the embodiment of the present invention, the adjusting end of the variable air volume system adjusts the opening degrees of the first electric air valve 31 and the second electric air valve 32 and the rotation speed of the first variable frequency fan 51 or the second variable frequency fan 52 through the air volume controller 4, so as to control the ratio between the air flowing through the heat exchanger and the indoor circulating air, and to ensure the stability of the preset air supply temperature. In the process, the maintenance of the preset temperature is a main regulation sequence, and the air supply volume is an auxiliary regulation sequence, that is, under the condition of ensuring the stable air supply temperature, the air supply volume entering the room through the air outlet pipe 13 is continuously changed.
In the above adjusting process, the air volume controller 4 further needs to collect an indoor temperature parameter, a preset temperature parameter, and a temperature and an air volume parameter of an air flow flowing through the heat exchanger and entering the variable air volume end device 1, respectively.
As shown in fig. 1, an air volume collector 6 is disposed in the blast pipe 11 and connected to the air volume controller 4 and the air volume collector, so that the air volume controller 4 can obtain the air pressure of the blast pipe 11 through the air volume collector 6, and further obtain the air volume parameter of the air flow flowing through the heat exchanger and entering the variable air volume end device 1.
In addition, as shown in fig. 2, the regulation end of the variable air volume system further includes a temperature controller 7, the temperature controller 7 is connected with the air volume controller 4, a preset temperature parameter can be set, a temperature parameter of the air flow passing through the heat exchanger is obtained according to the preset temperature parameter, and a temperature control signal corresponding to the corresponding temperature parameter is output to the air volume controller 4.
It should be noted that the temperature controller 7 may be a control panel corresponding to the adjusting end of the variable air volume system, and is usually disposed in the same indoor space as the corresponding adjusting end of the variable air volume system; therefore, a temperature sensor is further arranged in the temperature controller 7 and used for collecting indoor temperature parameters and outputting corresponding temperature control signals to the air volume controller 4.
Therefore, the air volume controller 4 compares and calculates the temperature control signal output by the temperature controller 7 with the air volume signal detected by the air volume sensor, and obtains the opening parameters of the first electric air valve 31 and the second electric air valve 32 and the rotating speed parameter of the first variable-frequency fan 51 or the second variable-frequency fan 52 under the conditions of preset temperature and preset air volume, and sends the parameter signal to corresponding equipment, thereby controlling and changing the opening of the first electric air valve 31 and the second electric air valve 32 and the rotating speed of the first variable-frequency fan 51 or the second variable-frequency fan 52.
It should be noted that, when the static pressure in the air supply pipe 11 changes, the air volume sensor can acquire the corresponding pressure parameter in real time, and send the pressure parameter to the air volume controller 4, that is, the air volume controller 4 can sense the variation range of the pressure parameter, and then correct the opening parameters of the first electric air valve 31 and the second electric air valve 32 and the rotation speed parameters of the first variable frequency fan 51 or the second variable frequency fan 52 in time through calculation, so as to avoid the air volume change of the air supply pipe 11 from affecting the air flow of the preset temperature and flow output by the variable air volume end device 1.
Because a plurality of variable air volume end devices 1 also need to automatically control the reheating device 2 when simultaneously operating the refrigeration and heating conditions, the temperature controller 7 is connected with the reheating device 2 for controlling the temperature of the reheating device 2, thereby realizing that the variable air volume end devices 1 are controlled to meet the heat supply requirement of the indoor area under the condition that the blast pipe 11 introduces cold air.
As shown in fig. 1 and 2, the reheating device 2 is disposed in the air outlet pipe 13, which is beneficial to reducing the diameter of the return air pipe compared with the arrangement of the reheating device in the indoor return air pipe 12, thereby saving the equipment investment. Therefore, the arrangement cost of the return air pipe can be effectively reduced by combining the arrangement scheme of the second variable frequency fan 52.
On the other hand, the utility model also provides a variable air volume air conditioning system, which comprises: the air conditioner comprises an air heat pump and an air conditioner outdoor box, wherein the air conditioner outdoor box is provided with an air inlet and an air outlet, a heat exchanger and an air supply fan are sequentially arranged between the air inlet and the air outlet, and the heat exchanger is used for circularly exchanging heat with the air heat pump and is used for heating or cooling air flowing through the heat exchanger; wherein the air outlet of the outdoor box of the air conditioner is communicated with a plurality of blast pipes 11 at the tail end of the variable air volume regulation in the previous aspect.
Thus, when the heat exchanger is in a refrigeration working condition, the air flowing through the heat exchanger is cooled into cold air, the cold air enters the variable air volume end device 1 and is uniformly mixed with indoor circulating air, the cold air is led out through the air outlet pipe 13 and flows into the room, and the temperature of the room is reduced, and at the moment, the adjusting end of the variable air volume system is in a refrigeration mode; if the reheating device 2 is turned on at the same time, the air flowing through the reheating device 2 is heated, and then the hot air flowing into the room through the air outlet pipe 13 is used for heating the room, at this time, the adjusting end of the variable air volume system is in the heating mode, and the working condition state of the heat exchanger does not need to be changed. Therefore, the variable air volume air conditioning system can meet the requirements of cooling and heating at the same time.
The air heat pump comprises a compressor, a condenser, an evaporator and a refrigerant circulating pipeline for communicating the compressor, the condenser and the evaporator. The heat exchanger arranged in the air-conditioning outdoor box can be any one of a condenser or an evaporator; in addition, the heat exchanger can also be in heat exchange connection with an evaporator or a condenser through a water medium circulating pipeline; both can reach the circulation heat transfer effect of heat exchanger and air heat pump.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An air volume variable system regulation terminal, comprising:
the variable air volume end device is respectively connected with an air supply pipe, an indoor air return pipe and an air outlet pipe, the air supply pipe and the indoor air return pipe are communicated with the air outlet pipe through the variable air volume end device, the air supply pipe is used for guiding air flowing through a heat exchanger into the variable air volume end device, the air return pipe is used for guiding indoor air into the air outlet pipe, and the air outlet pipe is used for guiding mixed air in the variable air volume end device out;
and the reheating device is arranged in the indoor return air pipe and a circulating channel between the air outlet pipes.
2. The variable air volume system adjusting terminal according to claim 1, wherein a first electric air valve is arranged in the air supply pipe, and a second electric air valve is arranged in the indoor return air pipe;
the air quantity controller is respectively connected with the first electric air valve and the second electric air valve and is used for respectively controlling the opening degrees of the first electric air valve and the second electric air valve.
3. The regulation terminal of claim 2, wherein a first variable frequency fan is arranged in the indoor return air pipe, and the air volume controller is connected with the first variable frequency fan and is used for controlling the rotating speed of the first variable frequency fan.
4. The regulation terminal of the variable air volume system according to claim 2, wherein a second variable frequency fan is arranged in the air outlet pipe, and the air volume controller is connected with the second variable frequency fan and is used for controlling the rotating speed of the second variable frequency fan.
5. The regulation terminal of the variable air volume system according to claim 3 or 4, wherein an air volume collector is further disposed in the air supply pipe, and the air volume controller is connected to the air volume collector and used for acquiring air pressure in the air supply pipe.
6. The terminal for adjusting the variable air volume system according to claim 5, further comprising a temperature controller connected to the air volume controller for outputting a temperature control signal to the air volume controller.
7. The terminal of claim 6, wherein a temperature sensor is further disposed in the temperature controller for collecting indoor temperature.
8. The variable air volume system regulating terminal according to claim 6, wherein the thermostat is further connected to the reheating device for controlling the temperature of the reheating device.
9. The variable air volume system regulating terminal according to claim 1, wherein the reheating device is arranged in the air outlet pipe.
10. A variable air volume air conditioning system, comprising:
an air heat pump;
the air conditioner outdoor box is provided with an air inlet and an air outlet, a heat exchanger and an air supply fan are sequentially arranged between the air inlet and the air outlet, and the heat exchanger is used for circularly exchanging heat with the air heat pump;
the air outlet is communicated with a plurality of air supply pipes of the variable air volume adjusting tail end of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121093383.3U CN215637697U (en) | 2021-05-20 | 2021-05-20 | Variable air volume system adjusting terminal and variable air volume air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121093383.3U CN215637697U (en) | 2021-05-20 | 2021-05-20 | Variable air volume system adjusting terminal and variable air volume air conditioning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215637697U true CN215637697U (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121093383.3U Active CN215637697U (en) | 2021-05-20 | 2021-05-20 | Variable air volume system adjusting terminal and variable air volume air conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215637697U (en) |
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2021
- 2021-05-20 CN CN202121093383.3U patent/CN215637697U/en active Active
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