CN216557513U - Spray evaporation condensation multi-stage heat recovery fresh air unit - Google Patents
Spray evaporation condensation multi-stage heat recovery fresh air unit Download PDFInfo
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- CN216557513U CN216557513U CN202123347152.3U CN202123347152U CN216557513U CN 216557513 U CN216557513 U CN 216557513U CN 202123347152 U CN202123347152 U CN 202123347152U CN 216557513 U CN216557513 U CN 216557513U
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Abstract
The utility model discloses a spraying, evaporating and condensing multi-stage heat recovery fresh air unit which comprises a box body assembly, a primary air-cooled evaporator, a secondary air-cooled evaporator, a blower, a spraying and cooling evaporator, a secondary air-cooled condenser and an exhaust fan, wherein outdoor air flows into the primary air-cooled evaporator along an outdoor fresh air flange and a first air filter, and the primary air-cooled evaporator is communicated with the blower through the secondary air-cooled evaporator and performs indoor air supply; indoor air flows into the spray cooling evaporator along the indoor air exhaust flange and the second air filter, and an air path of the spray cooling evaporator passes through the two-stage air-cooled condenser to be communicated with the exhaust fan and conducts outdoor exhaust. When the air heat recovery is carried out on the exhaust air heat recovery section and the fresh air heat recovery section, air flow has no cross pollution and mutual convection exchange, heat recovery is carried out by using water and a refrigerant as cooling and heat transfer media, the heat recovery device is suitable for people with large flow, corresponding products can be selected according to different fresh air areas in a targeted manner, and the energy-saving effect is good.
Description
Technical Field
The utility model relates to the field of fans, in particular to a spraying, evaporating and condensing multi-stage heat recovery fresh air handling unit.
Background
Currently, a fresh air handling unit is an air conditioning device that provides fresh air. The working principle is that fresh air is extracted from the room and sent to the room through a fan after dust removal, dehumidification (or humidification), temperature reduction (or heating) and the like, and the original air in the room is replaced when the fresh air enters the room.
However, the existing fresh air unit has the following defects:
the fresh air handling unit on the market has low applicability and low efficiency.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, one of the purposes of the utility model is to provide a spray evaporation condensation multi-stage heat recovery fresh air handling unit which can solve the problems of low applicability and low efficiency.
One of the purposes of the utility model is realized by adopting the following technical scheme:
a spray evaporation condensation multistage heat recovery fresh air handling unit comprises a box body assembly, a primary air-cooled evaporator, a secondary air-cooled evaporator, an air feeder, a spray cooling evaporator, a secondary air-cooled condenser and an exhaust fan, wherein the box body assembly comprises a fresh air box body side and an exhaust air box body side; an outdoor fresh air flange is arranged on the side of the fresh air box, and a first air filter is arranged at the outdoor fresh air flange; an air exhaust box body side is provided with an indoor air exhaust flange, and a second air filter is arranged at the indoor air exhaust flange; outdoor air flows into the primary air-cooled evaporator along the outdoor fresh air flange and the first air filter, and the primary air-cooled evaporator is communicated with the air feeder through the secondary air-cooled evaporator and carries out indoor air supply; indoor air flows into the spray cooling evaporator along the indoor air exhaust flange and the second air filter, and an air path of the spray cooling evaporator penetrates through the two-stage air-cooled condenser to be communicated with the exhaust fan and conducts outdoor exhaust.
Furthermore, a first-stage refrigerant throttling expansion valve, a first-stage shell-and-tube condenser and a first-stage air-conditioning compressor are arranged at the first-stage air-cooled evaporator, the first-stage shell-and-tube condenser is provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet form a loop with the spray cooling evaporator through pipelines.
Further, the spray cooling evaporator comprises a spray water distributor and a bidirectional hot and wet filler arranged right below the spray water distributor.
Further, the spray cooling evaporator comprises a recovery section, an inner plate of the recovery section adopts an SUS304 stainless steel plate lining, and a cooling stainless steel water tank is arranged on the inner side of the spray cooling evaporator.
Furthermore, the spraying water distributor is arranged on a plurality of water distribution nozzles, and the water distribution nozzles are provided with a self-filtering device to prevent blockage.
Furthermore, the box body assembly is an integrated box body, the fresh air box body side and the exhaust box body side are connected together, the primary air-cooled evaporator, the secondary air-cooled evaporator and the air blower are located on the fresh air box body side, and the spray cooling evaporator, the secondary air-cooled condenser and the exhaust fan are located on the exhaust box body.
Furthermore, the box body assembly is a split type box body, the fresh air box body side and the exhaust box body are separately arranged, the primary air-cooled evaporator, the secondary air-cooled evaporator and the air blower are located on the fresh air box body side, and the spray cooling evaporator, the secondary air-cooled condenser and the exhaust fan are located in the exhaust box body.
Further, new trend box side includes first upper box, first lower box, exhaust box side includes second upper box, second lower box, one-level air-cooled evaporimeter, two wind-cooled evaporimeters are located first lower box, the forced draught blower is located first upper box, spray cooling evaporimeter, two wind-cooled condenser are located second lower box, the exhaust fan is located second upper box.
Further, a first partition plate is arranged between the first upper-layer box body and the first lower-layer box body, and an air outlet flange for air flow to pass through is arranged at the first partition plate; and a second partition plate is arranged between the second upper-layer box body and the second lower-layer box body, and a bypass valve is arranged at the second partition plate.
Furthermore, a secondary refrigerant throttling expansion valve and a secondary air-conditioning compressor are arranged at the position of the secondary air-cooled evaporator, and a circulating cooling water pump, a cooling water inlet valve, a drain valve and a cooling water outlet valve are arranged on a loop of the primary air-cooled evaporator and the spray cooling evaporator.
Compared with the prior art, the utility model has the beneficial effects that:
an air exhaust box body side is provided with an indoor air exhaust flange, and a second air filter is arranged at the indoor air exhaust flange; outdoor air flows into the primary air-cooled evaporator along the outdoor fresh air flange and the first air filter, and the primary air-cooled evaporator is communicated with the air feeder through the secondary air-cooled evaporator and carries out indoor air supply; indoor air flows into the spray cooling evaporator along the indoor air exhaust flange and the second air filter, and an air path of the spray cooling evaporator penetrates through the two-stage air-cooled condenser to be communicated with the exhaust fan and conducts outdoor exhaust. When the air heat recovery is carried out on the exhaust air heat recovery section and the fresh air heat recovery section, air flows do not have cross contamination and do not exchange convection with each other, water and refrigerants are used for cooling and heat transfer media for heat recovery, the heat recovery device is suitable for large buildings such as stadiums, convention and exhibition centers, airports, subways, stations and the like with large pedestrian flow and large fresh air demand, and the amount of the air in the air treatment device is 5000m3H to 50000m3The heat recovery technology can be pertinently selected according to different fresh air areas, particularly applied to a strong wind fresh air unit and areas with longer transition seasons, has good energy-saving effect, and has the use functions of refrigeration, heating, dehumidification, ventilation and the like.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a spray-evaporation-condensation multi-stage heat recovery fresh air handling unit according to a preferred embodiment of the present invention;
FIG. 2 is a block diagram of a spray cooling evaporator in the spray evaporation condensation multi-stage heat recovery fresh air handling unit shown in FIG. 1;
FIG. 3 is a partial block diagram of the spray cooled evaporator of FIG. 2;
FIG. 4 is a schematic diagram of a heat pump heat recovery refrigerant circuit system;
FIG. 5 is a schematic diagram of the operation of a primary air conditioning compressor;
FIG. 6 is a schematic diagram of the operation of the two-stage air conditioning compressor;
FIG. 7 is a diagram illustrating the principle of autonomous control;
FIG. 8 is a block diagram of an embodiment with an integrated recooling source;
fig. 9 is a block diagram of an embodiment of a split type configuration with a re-cool source.
In the figure: 10. a case assembly; 11. an outdoor fresh air flange; 111. a first air filter; 12. an indoor air exhaust flange; 121. a second air filter; 20. a primary air-cooled evaporator; 21. a first-stage refrigerant throttle expansion valve; 22. a first shell and tube condenser; 23. a first stage air conditioning compressor; 30. a secondary air-cooled evaporator; 31. a second-stage refrigerant throttling expansion valve; 32. A secondary air conditioning compressor; 40. a blower; 50. a spray cooling evaporator; 51. spraying a water distributor; 52. bidirectional heat and moisture filling; 60. a two-stage air-cooled condenser; 70. an exhaust fan; 92. A circulating cooling water pump; 93. cooling the water inlet valve; 94. a drain valve; 95. cooling the water outlet valve; 96. A first bypass valve; 97. a second bypass valve.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1-9, a spray evaporation condensation multi-stage heat recovery fresh air handling unit includes a box assembly 10, a primary air-cooled evaporator 20, a secondary air-cooled evaporator 30, a blower 40, a spray cooling evaporator 50, a secondary air-cooled condenser 60, and an exhaust fan 70, wherein the box assembly 10 includes a fresh air box side and an exhaust box side; an outdoor fresh air flange 11 is arranged on the side of the fresh air box body, and a first air filter 111 is arranged at the position of the outdoor fresh air flange 11; an exhaust indoor air flange 12 is arranged on the exhaust box side, and a second air filter 121 is arranged at the exhaust indoor air flange 12; outdoor air flows into the primary air-cooled evaporator 20 along the outdoor fresh air flange 11 and the first air filter 111, and the primary air-cooled evaporator 20 is communicated with the blower 40 through the secondary air-cooled evaporator 30 and performs indoor air supply; indoor air flows into the spray cooling evaporator 50 along the flange 12 for exhausting indoor air and the second air filter 121, and an air path of the spray cooling evaporator 50 passes through the secondary air-cooled condenser 60 to be communicated with the exhaust fan 70 and exhausts the outdoor air. When the air heat recovery is carried out on the exhaust air heat recovery section and the fresh air heat recovery section, the air flow has no cross pollution and no mutual convection exchange, the heat recovery is carried out by using water and a refrigerant as cooling and heat transfer media, and the air heat recovery device is suitable for stadiums, convention and exhibition centers, airports and subways with large pedestrian flow and large fresh air demandAir quantity of large buildings such as station and the like is 5000m3H to 50000m3The heat recovery technology can be pertinently selected according to different fresh air areas, particularly applied to a strong wind fresh air unit and an area with a longer transition season, has good energy-saving effect, has the use functions of refrigeration, heating, dehumidification, ventilation and the like, and solves the problems of low applicability and low efficiency.
It should be noted that, in the application, the special efficient bidirectional heat and humidity filler is adopted to promote the cross countercurrent total heat recovery of spray water and indoor return air by more than 65%, the refrigerant heat pump direct expansion type total heat recovery mode is adopted, the condensate water recovery method of the air conditioning system is applied, and the condensate water is utilized to carry out system energy-saving water replenishing recovery on the steam unit. The technology of 'airflow change air duct' with variable working conditions is applied to realize that:
refrigeration, temperature reduction, dehumidification and total heat recovery in summer and heating heat recovery in winter;
and B, in a transition season, the air conditioner has no refrigeration type cooling, the cold source-free fresh air self-cooling technology with the independent air supply/exhaust function does not need external cooperation, the fresh air bypass does not need a cold source and is provided with an electrical control system, so that the energy of the air conditioner system is saved by more than 35 percent, and the air conditioner system is provided with the electrical control system. The heat exchanger does not need to be replaced, and the pre-cooling preheating function and the energy recovery function coexist.
Specifically, the summer heat recovery air treatment process comprises the following steps:
the fresh air side: outdoor fresh air flange, first air filter, primary air-cooled evaporator, secondary air-cooled evaporator, air outlet flange port, air feeder and indoor air supply. A first bypass valve is provided at the first partition, and the first bypass valve 96 is closed at this time.
Indoor exhaust side: the system comprises an indoor air exhaust flange, a second air filter, a spray cooling evaporator, a secondary air-cooled condenser, an exhaust flange port, an exhaust fan and outdoor exhaust. A second bypass valve is provided at the second partition, and the second bypass valve 97 is closed at this time.
Specifically, the air treatment process in the transition season comprises the following steps:
the fresh air side: the method comprises the following steps of (1) opening an outdoor fresh air flange, a first air filter, a first bypass valve, a blower and indoor air supply;
indoor exhaust side: the row is opened by an air flange, a second air filter, a second bypass valve, a secondary air-cooled condenser, an exhaust flange port, an exhaust fan and outdoor exhaust.
Preferably, a primary refrigerant throttle expansion valve 21, a primary shell-and-tube condenser 22 and a primary air conditioning compressor 23 are arranged at the primary air-cooled evaporator 20, the primary shell-and-tube condenser 22 is provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet form a loop with the spray cooling evaporator 50 through pipelines.
Preferably, the spray cooling evaporator 50 comprises a spray water distributor 51 and a bidirectional hot and wet filler 52 arranged right below the spray water distributor 51. The spray cooling evaporator 50 comprises a recovery section, an inner plate of the recovery section adopts an SUS304 stainless steel plate lining, and a cooling stainless steel water tank is arranged on the inner side of the spray cooling evaporator 50. The cooling water tank is made of an SUS304 stainless steel plate with the thickness of more than or equal to 1.2mm and is provided with supporting facilities such as an automatic water replenishing ball float valve, an overflow pipe, a sewage pipe orifice and the like.
Preferably, the spray water distributor 51 is disposed at a plurality of water distribution nozzles, and the water distribution nozzles are disposed with a self-filtering device to prevent blockage. Specifically, the water distribution nozzle is made of high-quality materials, the working temperature range is-30-60 ℃, the working pressure is not less than 0.4MPa, the nozzle atomization angle is not less than 120 degrees, the water distribution is uniform, and the surface of the core body can be fully distributed with a water curtain. Specifically, the high efficiency that this application adopted sprays heat recovery heat exchange core characteristics:
1. the core cooling component is an innovative high-efficiency evaporation core body evaporation medium-Celdek or a composite water absorption material. The material is prepared by adding special chemical raw materials into plant fibers, and has good hygroscopicity and wet stiffness. The evaporative cooling wet film-the composite multilayer corrugated fiber laminate organic wet film.
2. The spray heat exchange wet film is a corrugated plate-shaped cross-linked overlapped hydrophilic polymer composite material formed after resin bonding treatment of special components, and the corrugation height is 7-9 mm, and the corrugation angle is 45 degrees. The slow-release bacteriostatic agent is contained in the composite material, so that the breeding of bacteria can be effectively inhibited. The water absorption is strong, the working temperature is as follows: <60 ℃.
3. The heat recovery core body adopted by the heat recovery device can meet the following requirements: the organic hydrophilic wet film material with strong water absorption is adopted, and has no toxicity, acid and alkali corrosion resistance and strong aging resistance.
4. The wet membrane is in a modular design, and a stainless steel frame is arranged on the periphery of the wet membrane. The removable modular design, the installation and maintenance are simple and convenient, and the cleaning and the use can be repeated.
5. Ageing-resistant, easy maintenance, anti tearing, full thermal efficiency is high, reaches: 65 percent of the refrigerant is used, the service cycle is long, and the refrigerating temperature efficiency reaches 65 percent.
The principle of the method is that the natural physical phenomenon of 'high-temperature water and low-temperature air absorb heat' is utilized, water is conveyed to a water distributor through a water pump, the water uniformly falls on a wet film from the water distributor, a water film is formed on the fiber surface of the wet film, then air is supplied outwards through a fan, negative pressure is generated in the machine, the low-temperature air is fully contacted with moisture after passing through a soaked wet film, and meanwhile sensible heat in the low-temperature air is absorbed, so that the purpose of water cooling is achieved.
Preferably, in the first embodiment, the case assembly 10 is an integrated case, the fresh air case side and the exhaust case side are joined together, the primary air-cooled evaporator 20, the secondary air-cooled evaporator 30, and the blower 40 are located on the fresh air case side, and the spray cooling evaporator 50, the secondary air-cooled condenser 60, and the exhaust fan 70 are located on the exhaust case.
Preferably, in the second embodiment, the case assembly 10 is a split case, the fresh air case side and the exhaust case are separately provided, the primary air-cooled evaporator 20, the secondary air-cooled evaporator 30 and the blower 40 are located on the fresh air case side, and the spray cooling evaporator 50, the secondary air-cooled condenser 60 and the exhaust fan 70 are located on the exhaust case.
Preferably, the fresh air box side includes a first upper box and a first lower box, the exhaust box side includes a second upper box and a second lower box, the primary air-cooled evaporator 20 and the secondary air-cooled evaporator 30 are located in the first lower box, the blower 40 is located in the first upper box, the spray cooling evaporator 50 and the secondary air-cooled condenser 60 are located in the second lower box, and the exhaust fan 70 is located in the second upper box. A first partition plate is arranged between the first upper-layer box body and the first lower-layer box body, and an air outlet flange for air flow to pass through is arranged at the first partition plate; and a second partition plate is arranged between the second upper-layer box body and the second lower-layer box body, and a bypass valve is arranged at the second partition plate. The air quality of the corresponding product can be selected according to different fresh air areas in a targeted manner, and the requirements of different projects, use environments and loads are met. Indoor air exhaust and fresh air do not have any contact when the unit moves, air cross contamination has been stopped completely, ensures clean, healthy air quality energy-efficient, and intelligent automatic control can choose to join in marriage according to project and service environment of difference: the multifunctional combined complete machine or split machine set is flexible to install and use. The equipment investment is less, the maintenance cost is low, all investment can be recovered within two to three years, and the cost performance is good.
Preferably, a secondary refrigerant throttle expansion valve 31 and a secondary air conditioning compressor 32 are disposed at the secondary air-cooled evaporator 30, and a circulating cooling water pump 92, a cooling water inlet valve 93, a drain valve 94 and a cooling water outlet valve 95 are disposed on a loop of the primary air-cooled evaporator 20 and the spray cooling evaporator 50. Whole device compact structure, novel structure, design benefit, the suitability is strong, the facilitate promotion.
Referring to fig. 8, a structural diagram of an embodiment integrally configured with a heat sink is shown, which is different from the first embodiment: a re-cooling source is provided. Referring to fig. 9, a structure diagram of an embodiment of a split type cooling device is shown, which is different from the embodiment: the cold recycling source is arranged and the split type is adopted, and the branch structures are connected by external connecting pipes.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. The utility model provides a spray evaporation condensation multistage heat recovery fresh air handling unit, includes box subassembly, one-level air-cooled evaporimeter, two stage wind-cooled evaporimeter, forced draught blower, spray cooling evaporimeter, two stage wind-cooled condenser, exhaust fan, its characterized in that:
the box body component comprises a fresh air box body side and an exhaust box body side; an outdoor fresh air flange is arranged on the side of the fresh air box, and a first air filter is arranged at the outdoor fresh air flange; an air exhaust box body side is provided with an indoor air exhaust flange, and a second air filter is arranged at the indoor air exhaust flange;
outdoor air flows into the primary air-cooled evaporator along the outdoor fresh air flange and the first air filter, and the primary air-cooled evaporator is communicated with the air feeder through the secondary air-cooled evaporator and carries out indoor air supply; indoor air flows into the spray cooling evaporator along the indoor air exhaust flange and the second air filter, and an air path of the spray cooling evaporator penetrates through the two-stage air-cooled condenser to be communicated with the exhaust fan and conducts outdoor exhaust.
2. The spray evaporation condensation multi-stage heat recovery fresh air handling unit of claim 1, wherein: the primary air-cooled evaporator is provided with a primary refrigerant throttle expansion valve, a primary shell-and-tube condenser and a primary air-conditioning compressor, the primary shell-and-tube condenser is provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet form a loop with the spray cooling evaporator through pipelines.
3. The spray evaporative condensation multi-stage heat recovery fresh air handling unit of claim 2, wherein: the spray cooling evaporator comprises a spray water distributor and a bidirectional hot and wet filler arranged right below the spray water distributor.
4. The spray evaporative condensation multi-stage heat recovery fresh air handling unit of claim 3, wherein: the spray cooling evaporator comprises a recovery section, an inner plate of the recovery section adopts an SUS304 stainless steel plate lining, and a cooling stainless steel water tank is arranged on the inner side of the spray cooling evaporator.
5. The spray evaporative condensation multi-stage heat recovery fresh air handling unit of claim 3, wherein: the spraying water distributor is arranged on a plurality of water distribution nozzles, and the water distribution nozzles are provided with a self-filtering device to prevent blockage.
6. The spray evaporation condensation multi-stage heat recovery fresh air handling unit of claim 1, wherein: the novel air box is characterized in that the box body assembly is an integrated box body, the fresh air box body side and the exhaust box body side are connected together, the primary air-cooled evaporator, the secondary air-cooled evaporator and the air blower are located on the fresh air box body side, and the spray cooling evaporator, the secondary air-cooled condenser and the exhaust fan are located on the exhaust box body.
7. The spray evaporation condensation multi-stage heat recovery fresh air handling unit of claim 1, wherein: the novel air-cooling type refrigerator is characterized in that the box body assembly is a split type box body, the fresh air box body side and the air exhaust box body are separately arranged, the primary air-cooling type evaporator, the secondary air-cooling type evaporator and the air blower are located on the fresh air box body side, and the spray cooling type evaporator, the secondary air-cooling type condenser and the air exhaust fan are located on the air exhaust box body.
8. The spray evaporative condensation multi-stage heat recovery fresh air handling unit according to any one of claims 6 or 7, wherein: the novel air box side comprises a first upper box body and a first lower box body, the exhaust box side comprises a second upper box body and a second lower box body, the first-stage air-cooled evaporator and the second-stage air-cooled evaporator are located in the first lower box body, the air blower is located in the first upper box body, the spray cooling evaporator and the second-stage air-cooled condenser are located in the second lower box body, and the exhaust fan is located in the second upper box body.
9. The spray evaporative condensation multi-stage heat recovery fresh air handling unit of claim 8, wherein: a first partition plate is arranged between the first upper-layer box body and the first lower-layer box body, and an air outlet flange for air flow to pass through is arranged at the first partition plate; and a second partition plate is arranged between the second upper-layer box body and the second lower-layer box body, and a bypass valve is arranged at the second partition plate.
10. The spray evaporation condensation multi-stage heat recovery fresh air handling unit of claim 1, wherein: and a secondary refrigerant throttling expansion valve and a secondary air-conditioning compressor are arranged at the position of the secondary air-cooled evaporator, and a circulating cooling water pump, a cooling water inlet valve, a drain valve and a cooling water outlet valve are arranged on a loop of the primary air-cooled evaporator and the spray cooling evaporator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123347152.3U CN216557513U (en) | 2021-12-27 | 2021-12-27 | Spray evaporation condensation multi-stage heat recovery fresh air unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123347152.3U CN216557513U (en) | 2021-12-27 | 2021-12-27 | Spray evaporation condensation multi-stage heat recovery fresh air unit |
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| CN216557513U true CN216557513U (en) | 2022-05-17 |
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| CN202123347152.3U Active CN216557513U (en) | 2021-12-27 | 2021-12-27 | Spray evaporation condensation multi-stage heat recovery fresh air unit |
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2021
- 2021-12-27 CN CN202123347152.3U patent/CN216557513U/en active Active
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