Fresh air handling unit

Abstract

The utility model provides a fresh air handling unit which comprises a shell internally provided with a containing cavity, a fresh air opening and an air return opening are formed in the first end of the shell, and an air supply opening is formed in the second end of the shell; the filtering device is close to the first end of the shell; the surface air cooler set comprises a plurality of surface air coolers and is arranged on the side, facing the air supply opening, of the filtering device. A water outlet of the cold and heat source host is communicated with a water outlet pipe, the water outlet pipe is communicated with a plurality of water outlet branch pipes, one water outlet branch pipe is communicated with an inlet of one surface air cooler, a water return port is communicated with a water return pipe, the water return pipe is communicated with a plurality of water return branch pipes, and one water return branch pipe is communicated with an outlet of one surface air cooler; the humidifying device is arranged on the side, facing the air supply opening, of the surface air cooler set; the evaporator is arranged on the side, facing the air supply opening, of the humidifying device; the condenser is arranged on the side, facing the air supply opening, of the evaporator. An outlet of the compressor communicates with an inlet of the condenser, an outlet of the condenser communicates with an inlet of the evaporator, and an outlet of the evaporator communicates with an inlet of the compressor; and the fan is arranged close to the air supply outlet.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fresh air device technical field, concretely relates to a fresh air handling unit. BACKGROUND

[0002] The temperature and humidity independent control air conditioning system is applied more and more widely in the market in recent years with energy saving and comfort, and especially the non-blowing feeling mute system with capillary network or radiation plate as temperature control terminal. The core product in this system is fresh air humidity regulating equipment (fresh air machine), so the dehumidification and humidification effect is required higher. In the prior art, the airflow introduced into the fresh air machine is dehumidified by the direct expansion system composed of compressor, electronic expansion valve, condenser and evaporator, but the dehumidification efficiency is not high, and sometimes cannot meet the requirement of rapid dehumidification. In addition, in the humidification process, the airflow is heated and warmed by the direct expansion system first, and then is humidified by the humidification device, and the humidified airflow is transported to the indoor, but the humidification device will produce the phenomenon of water floating after humidification, that is, the airflow will carry the water in the humidification device out, and the water will float to the downstream or even be sent into the indoor. SUMMARY

[0003] Therefore, the utility model provides a fresh air handling unit to solve the above technical problems.

[0004] The fresh air handling unit provided by the utility model comprises:

[0005] A shell is provided with an accommodating cavity, a fresh air inlet and a return air inlet communicating with the accommodating cavity are formed in the first end of the shell, and a supply air inlet communicating with the accommodating cavity is formed in the second end of the shell.

[0006] A filter device is arranged in the accommodating cavity and close to the first end of the shell.

[0007] A surface cooler group comprising a plurality of surface coolers is arranged on the side of the filter device facing the supply air inlet, and the plurality of surface coolers are arranged in sequence along the connecting line direction of the fresh air inlet and the supply air inlet.

[0008] A cold and heat source host is provided with a water outlet communicating with a water outlet pipe, the water outlet pipe communicates with a plurality of water outlet branch pipes, one water outlet branch pipe communicates with the inlet of one surface cooler, one water outlet valve is arranged on each water outlet branch pipe, the cold and heat source host is provided with a water return port communicating with a water return pipe, the water return pipe communicates with a plurality of water return branch pipes, one water return branch pipe communicates with the outlet of one surface cooler, and one water return valve is arranged on each water return branch pipe.

[0009] A humidification device is arranged on the side of the surface cooler group facing the supply air inlet.

[0010] an evaporator arranged on a side of the humidifying device facing the air outlet;

[0011] a condenser arranged on a side of the evaporator facing the air outlet;

[0012] a compressor, an outlet of which is in communication with an inlet of the condenser, an outlet of the condenser is in communication with an inlet of the evaporator through a communication pipe, an outlet of the evaporator is in communication with an inlet of the compressor, and a throttling element is arranged on the communication pipe;

[0013] a fan arranged in the accommodating cavity close to the air outlet.

[0014] Optionally, the fresh air unit further comprises:

[0015] a baffle arranged on a side of the condenser facing the air outlet, fixedly connected with the inner wall of the shell in a circumferential direction, and provided with a ventilation hole at a position corresponding to the condenser.

[0016] Optionally, the filtering device comprises a primary filter and a high-efficiency filter, the high-efficiency filter being arranged on a side of the primary filter facing the air outlet.

[0017] Optionally, a first water collecting tray is arranged below the surface air cooler, and a first liquid level sensor is arranged in the first water collecting tray.

[0018] The first water collecting tray is provided with a first water outlet, and a first water discharge pipe is connected to the first water outlet, and a first water discharge valve is arranged in the first water discharge pipe.

[0019] The fresh air unit further comprises a controller, an input end of the controller is in communication connection with an output end of the first liquid level sensor, and an output end of the controller is in communication connection with a control end of the first water discharge valve.

[0020] Optionally, a second water collecting tray is arranged below the evaporator, and a second liquid level sensor is arranged in the second water collecting tray.

[0021] The second water collecting tray is provided with a second water outlet, a second water discharge pipe is connected to the second water outlet, and a second water discharge valve is arranged in the second water discharge pipe.

[0022] The input end of the controller is in communication connection with the output end of the second liquid level sensor, and the output end of the controller is in communication connection with the control end of the second water discharge valve.

[0023] Optionally, the fresh air unit further comprises an alarm, and an input end of the alarm is in communication connection with an output end of the controller.

[0024] Optionally, the compressor is a fixed-frequency compressor.

[0025] Optionally, the throttling member is a throttling capillary tube.

[0026] Optionally, the inner wall of the shell is covered with a sound insulation layer.

[0027] Optionally, the fresh air handling unit further comprises a sterilization device arranged on the side of the filtering device facing the first end of the shell.

[0028] The above technical solution of the fresh air handling unit has at least the following beneficial effects compared with the prior art:

[0029] The fresh air handling unit can realize rapid cooling and dehumidification and rapid heating by means of multiple surface air coolers and evaporators in the surface air cooling unit, which can perform multi-stage cooling and dehumidification on the airflow in summer and multiple heating on the airflow in winter. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The drawing is a schematic view of the fresh air handling unit according to an embodiment of the present application.

[0031] Reference signs:

[0032] 1: shell; 101: fresh air inlet; 102: return air inlet; 103: air outlet; 2: filtering device; 201: primary filter; 202: high-efficiency filter; 3: surface air cooler set; 301: surface air cooler; 4: humidifying device; 5: evaporator; 6: condenser; 7: compressor; 8: fan; 9: water outlet pipe; 10: water return pipe; 11: communication pipe; 12: throttling member; 13: shielding plate; 14: water outlet branch pipe; 15: water return branch pipe. DETAILED DESCRIPTION

[0033] The utility model discloses an air handling unit, which comprises a shell, a filter device, a surface cooler group, a cold and heat source host (not shown), a humidifying device, an evaporator, a condenser, a compressor and a fan.

[0034] Figure 1 The utility model discloses an air handling unit, which comprises a shell, a filter device, a surface cooler group, a cold and heat source host (not shown), a humidifying device, an evaporator, a condenser, a compressor and a fan. Figure 1

[0035] The shell is provided with a containing cavity, a fresh air outlet 101 and a return air outlet 102, which are communicated with the containing cavity and are arranged at a first end of the shell, and a supply air outlet 103, which is communicated with the containing cavity and is arranged at a second end of the shell.

[0036] ​When cooling and dehumidification is required in summer, according to the efficiency requirement of cooling and dehumidification, select the appropriate number of cooling coils 301 to work, open the appropriate number of cooling coils 301 corresponding to the water outlet valve on the water outlet branch pipe 14 and the water return valve on the water return branch pipe 15, close the humidifying device 4, start the compressor 7, evaporator 5, condenser 6 and fan 8. The cold heat source host sends refrigerant to each water outlet branch pipe 14 through the water outlet pipe 9, the refrigerant flows through the water outlet branch pipe 14 where the water outlet valve is open, enters the corresponding cooling coil 301, and the outside air and indoor return air enter the containing cavity through the fresh air inlet 101 and the return air inlet 102 under the suction of the fan 8. After flowing through the filtering device 2, the impurities in the airflow are filtered, and the filtered airflow passes through the multiple cooling coils 301 arranged in turn, and exchanges heat with the cooling coil 301 when passing through the cooling coil 301 with refrigerant flowing inside. After heat exchange, the airflow is cooled and the water vapor carried is condensed and falls. After flowing through multiple cooling coils 301 in working condition, the water vapor is condensed and dehumidified after multiple cooling. Most of the water vapor in the airflow is condensed and dehumidified. The refrigerant in each cooling coil 301 participating in heat exchange is heated after heat exchange with the airflow, flows back to the water return pipe 10 through the corresponding water return branch pipe 15, and returns to the cold heat source host through the water return pipe 10. The airflow passing through the cooling coil group 3 continues to pass through the humidifying device 4 and reaches the evaporator 5. During the process of flowing through the evaporator 5, the airflow exchanges heat with the evaporator 5, and the airflow is further cooled and dehumidified. The temperature of the dehumidified airflow is too low, which can reach 11.5℃, and when it flows through the condenser 6, it exchanges heat with the condenser 6, and its temperature rises to an appropriate temperature of 15-18℃. Finally, the airflow is discharged to the indoor through the fresh air inlet 101 to provide fresh air with appropriate humidity and temperature.

[0037] When heating and humidification are needed in winter, according to the efficiency requirement of heating, a suitable number of surface coolers 301 are selected to work, the water outlet valves on the water outlet branch pipes 14 and the water return valves on the water return branch pipes 15 corresponding to the suitable number of surface coolers 301 are opened, the humidification device 4 and the fan 8 are started, and the compressor 7, the evaporator 5 and the condenser 6 are closed, so that they are in a non-working state. The cold and heat source main machine sends the heat medium to each water outlet branch pipe 14 through the water outlet pipe 9, the heat medium flows through the water outlet branch pipe 14 in which the water outlet valve is in an open state, enters the corresponding surface cooler 301, and the outside air and the indoor return air enter the containing cavity through the fresh air inlet 101 and the return air inlet 102 under the suction of the fan 8. After flowing through the filtering device 2, the impurities in the airflow are filtered, and the filtered airflow flows through the plurality of surface coolers 301 arranged in sequence, and when flowing through the surface coolers 301 in which the heat medium flows, the airflow exchanges heat with the surface coolers 301. After the heat exchange, the airflow is heated, and after flowing through the plurality of surface coolers 301 in a working state, the airflow is heated for multiple times to reach a suitable temperature for human body. The heat medium in each surface cooler 301 participating in heat exchange is cooled after heat exchange with the airflow, flows back to the water return pipe 10 through the corresponding water return branch pipe 15, and returns to the cold and heat source main machine through the water return pipe 10. The airflow heated by passing through the surface cooler group 3 flows through the humidification device 4, and the humidity of the airflow is increased under the action of the humidification device 4. After the humidified airflow passes through the non-working evaporator 5 and condenser 6, the airflow is discharged to the indoor through the fresh air inlet 101 to provide fresh air with suitable humidity and temperature.

[0038] When the efficiency requirement of refrigeration and dehumidification in summer or the efficiency requirement of heating in winter is high, a larger number of surface coolers 301 can be selected to work, and when the efficiency requirement of refrigeration and dehumidification in summer or the efficiency requirement of heating in winter is low, a smaller number of surface coolers 301 can be selected to work.

[0039] By using the fresh air handling unit, the plurality of surface coolers 301 and the evaporator 5 in the surface cooler group 3 are used to multi-stage cool and dehumidify the airflow in summer and heat the airflow multiple times in winter, so that the requirements of rapid cooling and dehumidification and rapid heating can be met. Moreover, the humidification device 4 is arranged before the evaporator 5 and the condenser 6, the water splashed from the humidification device 4 is intercepted by the evaporator 5 and the condenser 6 after the airflow is humidified by the humidification device 4, so that the water is prevented from floating into the indoor along with the airflow, and the user experience is affected.

[0040] As Figure 1As shown, in this embodiment, the left end of the housing 1 is the first end, with a fresh air inlet 101 connecting to outdoor air and a return air inlet 102 connecting to indoor air; the right end is the second end, with a supply air inlet 103 for delivering fresh air. A filter device 2 is located at the left end of the housing, near the fresh air inlet 101 and the return air inlet 102. A surface cooler assembly 3, a humidifier 4, an evaporator 5, and a condenser 6 are arranged sequentially to the right of the filter device 2. In this embodiment, the surface cooler assembly 3 includes two surface coolers 301. The inlet of each surface cooler 301 is connected to a water outlet branch pipe 14, and each water outlet branch pipe 14 is connected to a water outlet pipe 9. The water outlet pipe 9 penetrates the housing 1 and connects to the water outlet of the externally located heat and cold source unit. The outlet of each surface cooler 301 is connected to a return water branch pipe 15, and each return water branch pipe 15 is connected to a return water pipe 10. The return water pipe 10 penetrates the housing 1 and connects to the return water outlet of the externally located heat and cold source unit. When rapid cooling and dehumidification or rapid heating is required, the outlet valves on both outlet branch pipes 14 and the return valve on the return branch pipe 15 can be opened to make both surface coolers 301 work. When rapid cooling and dehumidification or rapid heating is not required, only the outlet valve on one outlet branch pipe 14 and the corresponding return valve on the return branch pipe 15 can be opened to make only one surface cooler 301 work. Depending on the actual application, the surface cooler group 3 can include any number of surface coolers 301, such as three or four. The filter device 2 can be any structure with a filtration function. The humidification device 4 can be any commercially available humidification structure. The direct expansion system consisting of the compressor 7, the throttling device 12, the evaporator 5, and the condenser 6 is a mature existing technology. The working principle of the components working together to absorb heat from the airflow at the evaporator 5 and heat the airflow at the condenser 6 will not be described in detail here.

[0041] Optionally, the fresh air unit also includes a baffle plate 13, which is disposed on the side of the condenser 6 facing the air outlet 103, and is circumferentially fixedly connected to the inner wall of the housing 1, with ventilation holes provided at the positions corresponding to the condenser 6. This arrangement, by means of the baffle plate 13, intercepts the airflow flowing through the cross-section of the receiving cavity, ensuring that all airflow can only pass through the filter device 2, the surface cooler group 3, the humidifier 4, the evaporator 5, and the condenser 6 before being delivered to the air outlet 103 through the ventilation holes on the baffle plate 13, and finally discharged into the room through the air outlet 103, preventing some airflow introduced into the housing 1 from being discharged directly into the room through the air outlet 103 without treatment.

[0042] like Figure 1 As shown, in this embodiment, the baffle plate 13 is disposed close to the right side of the condenser 6, and its cross-sectional dimensions match those of the housing 1, blocking the cross-section of the housing 1, and the compressor 7 is isolated to the right side of the baffle plate 13. The size of the ventilation holes opened on the baffle plate 13 matches the cross-sectional dimensions of the condenser 6, so that the airflow passing through the condenser 6 can pass through the ventilation holes, while the airflow outside the condenser 6 cannot pass through.

[0043] Optionally, the filtering device 2 comprises a primary filter 201 and a high-efficiency filter 202, the high-efficiency filter 202 is arranged on the side of the primary filter 201 facing the air outlet 103. The filtering particle size of the high-efficiency filter 202 is smaller than that of the primary filter 201. With such an arrangement, the air flow introduced into the shell 1 first passes through the primary filter 201 to filter out large-particle impurities in the air flow, and then passes through the high-efficiency filter 202 to filter out small-particle impurities in the air flow, double filtration, thereby achieving a better filtering effect.

[0044] In the embodiment, the primary filter 201 and the high-efficiency filter 202 are selected to have different mesh sizes of the filter screen to achieve different filtering effects. According to actual application conditions, the mesh size and the number of layers of the filter screen can be adjusted, and other filtering devices 2 other than the filter screen can also be selected.

[0045] Optionally, a first water collecting tray (not shown) is arranged below the surface cooler group 3, and a first liquid level sensor (not shown) is arranged in the first water collecting tray. The first water collecting tray is provided with a first water outlet, and a first drain pipe (not shown) is connected to the first water outlet. A first drain valve is installed in the first drain pipe. The fresh air unit further comprises a controller, an input end of the controller is in communication connection with an output end of the first liquid level sensor, and an output end of the controller is in communication connection with a control end of the first drain valve.

[0046] During the refrigeration and dehumidification process in summer, the surface cooler group 3 is injected with refrigerant. When the air flow introduced into the shell 1 passes through the surface cooler group 3, heat exchange is performed between the air flow and the refrigerant in the surface cooler 301, the water vapor in the air flow is condensed by heat dissipation, and the condensed water falls along the surface cooler 301. The above arrangement can collect the condensed water in the first water collecting tray, preventing the condensed water from directly falling into the shell 1. At the same time, the first liquid level sensor monitors the liquid level data in the first water collecting tray in real time and transmits the liquid level data to the controller in real time. When the monitored liquid level data is greater than the set liquid level pre-stored in the controller, it indicates that there is too much condensed water in the first water collecting tray. At this time, the controller controls the first drain valve to open, and the condensed water in the first water collecting tray is discharged to the outside of the shell 1 through the first drain pipe.

[0047] Optionally, a second water collecting tray (not shown) is arranged below the evaporator 5, and a second liquid level sensor (not shown) is arranged in the second water collecting tray. The second water collecting tray is provided with a second water outlet, and a second drain pipe (not shown) is connected to the second water outlet. A second drain valve is installed in the second drain pipe. The input end of the controller is in communication connection with the output end of the second liquid level sensor, and the output end of the controller is in communication connection with the control end of the second drain valve.

[0048] In the summer refrigeration and dehumidification process, the evaporator 5 is started, and the airflow introduced into the shell 1 exchanges heat with the refrigerant in the evaporator 5 when passing through the evaporator 5. The water vapor in the airflow is condensed by heat dissipation, and the condensed water falls along the evaporator 5. The above setting can use the second water collecting tray to collect the condensed water uniformly and prevent it from falling directly into the shell 1. At the same time, the second liquid level sensor monitors the liquid level data in the second water collecting tray in real time, and transmits the liquid level data to the controller in real time. When the monitored liquid level data is greater than the preset set liquid level in the controller, it indicates that there is too much condensed water in the second water collecting tray. At this time, the controller controls the second drain valve to open, and the condensed water in the second water collecting tray is drained to the outside of the shell 1 through the second drain pipe.

[0049] Optionally, the fresh air handling unit further comprises an alarm, and an input end of the alarm is in communication connection with an output end of the controller. If the first drain pipe or / and the second drain pipe is blocked, the condensed water in the first water collecting tray or / and the second water collecting tray cannot be smoothly drained, which will cause the liquid level of the condensed water to continue to rise. When the liquid level data monitored by the first liquid level sensor or / and the second liquid level sensor is greater than the critical liquid level pre-stored in the controller, it indicates that there is a blockage. At this time, the controller controls the alarm to issue an alarm to prompt the staff to overhaul.

[0050] Optionally, the compressor 7 is a fixed-frequency compressor 7. The fixed-frequency compressor 7 has low cost, simple system, stable and reliable operation, and relatively easy maintenance.

[0051] Optionally, the throttling member 12 is a throttling capillary tube. The throttling capillary tube is easy to manufacture and low in price, has no moving parts, is not prone to failure and leakage, and is conducive to long-term stable use.

[0052] Optionally, the inner wall of the shell 1 is covered with a sound insulation layer. The fan 8 will produce vibration noise during operation. The sound insulation layer laid on the inner wall of the shell 1 can reduce noise to a certain extent and improve user experience. The sound insulation layer can be made of any material with sound insulation effect, such as sound insulation sponge.

[0053] Optionally, the fresh air handling unit further comprises a sterilization device (not shown), and the sterilization device is arranged on one side of the first end of the filter device 2 facing the shell 1. The sterilization device is arranged to allow the airflow introduced into the shell 1 to flow through the sterilization device first, remove bacteria and the like carried in the airflow, and then perform subsequent refrigeration and dehumidification or heating and humidification processes, thereby ensuring the safety of the fresh air delivered to the indoor. The sterilization device can be any structure suitable for sterilizing fresh air on the market.

[0054] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: the technical solutions recorded in the foregoing examples can still be modified, or some technical features therein can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A fresh air handling unit, characterized in that The new air unit comprises a shell, a filter device, a cooling group, a cold and heat source host, a humidifying device, an evaporator, a condenser, a compressor and a fan. The shell is internally provided with a containing cavity, a fresh air inlet and a return air inlet which are communicated with the containing cavity and are arranged at a first end of the shell, and a supply air outlet which is communicated with the containing cavity and is arranged at a second end of the shell. The filter device is arranged in the containing cavity and is arranged close to the first end of the shell. The cooling group comprises a plurality of cooling coils which are arranged on a side of the filter device which is close to the supply air outlet and are arranged in sequence along a connecting line direction of the fresh air inlet and the supply air outlet. The cold and heat source host is provided with a water outlet which is communicated with a water outlet pipe, the water outlet pipe is communicated with a plurality of water outlet branch pipes, one water outlet branch pipe is communicated with an inlet of one cooling coil, one water outlet valve is arranged on each water outlet branch pipe, the cold and heat source host is provided with a water return outlet which is communicated with a water return pipe, the water return pipe is communicated with a plurality of water return branch pipes, one water return branch pipe is communicated with an outlet of one cooling coil, and one water return valve is arranged on each water return branch pipe. The humidifying device is arranged on a side of the cooling group which is close to the supply air outlet. The evaporator is arranged on a side of the humidifying device which is close to the supply air outlet. The condenser is arranged on a side of the evaporator which is close to the supply air outlet. The outlet of the compressor is communicated with the inlet of the condenser, the outlet of the condenser is communicated with the inlet of the evaporator through a connecting pipe, the outlet of the evaporator is communicated with the inlet of the compressor, and a throttling element is arranged on the connecting pipe. The fan is arranged in the containing cavity and is arranged close to the supply air outlet.

2. The fresh air handling unit according to claim 1, characterized in that Further comprising a shielding plate which is arranged on a side of the condenser which is close to the supply air outlet, is fixedly connected with the inner wall of the shell in a circumferential direction, and is provided with a ventilation hole at a position corresponding to the condenser.

3. The new air unit according to claim 1 or 2, characterized in that the filter device comprises a primary filter and a high-efficiency filter, and the high-efficiency filter is arranged on a side of the primary filter which is close to the supply air outlet.

4. The new air unit according to claim 1 or 2, characterized in that a first water collecting tray is arranged below the cooling group, the first water collecting tray is provided with a first liquid level sensor, the first water collecting tray is provided with a first water outlet, a first water outlet pipe is connected with the first water outlet, and a first water outlet valve is arranged in the first water outlet pipe; and the new air unit further comprises a controller, an input end of the controller is in communication connection with an output end of the first liquid level sensor, and an output end of the controller is in communication connection with a control end of the first water outlet valve.

5. The new air unit according to claim 4, characterized in that a second water collecting tray is arranged below the evaporator, the second water collecting tray is provided with a second liquid level sensor, the second water collecting tray is provided with a second water outlet, a second water outlet pipe is connected with the second water outlet, and a second water outlet valve is arranged in the second water outlet pipe; and the input end of the controller is in communication connection with the output end of the second liquid level sensor, and the output end of the controller is in communication connection with the control end of the second water outlet valve. Further comprising ​ ​ ​ ​ ​ ​ ​ 6. The fresh air handling unit of claim 5, wherein, ​ An alarm, an input end of the alarm being connected with an output end of the controller.

7. The fresh air handling unit according to claim 1 or 2, characterized in that: The compressor is a fixed frequency compressor.

8. The fresh air handling unit according to claim 1 or 2, characterized in that: The throttling member is a throttling capillary tube.

9. The fresh air handling unit according to claim 1 or 2, characterized in that: The inner wall of the shell is covered with a sound insulation layer.

10. The fresh air handling unit according to claim 1 or 2, characterized in that Further comprising: A sterilization device, the sterilization device being arranged on one side of the filter device facing the first end of the shell.

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