Fresh air handling unit

By using temperature sensors and variable frequency fans in the fresh air unit, the air volume of the heater is adjusted according to the air temperature changes, the complex problem of adjusting the air outlet temperature in the prior art is solved, and simpler and more efficient air temperature control is achieved.

CN222438120UActive Publication Date: 2025-02-07BEIJING JINMAO HABITAT ENVIRONMENT TECH CO LTD
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Patent Information

Application Number
CN202323404762.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-13
Publication Date
2025-02-07
Estimated Expiration
2033-12-13

AI Technical Summary

Technical Problem

In existing heating and ventilation equipment, the control method of adjusting the air outlet temperature is complex, and the control rules of multiple throttle valves are required. Especially when the dehumidification load changes greatly, unreasonable distribution is prone to occur.

Method used

By setting a temperature sensor and a variable frequency fan in the air supply duct of the fresh air unit, the speed of the variable frequency fan is changed according to the monitored air temperature to adjust the air volume flowing through the heater, thereby adjusting the air temperature.

Benefits of technology

It realizes simple adjustment of air temperature, avoids complex management of the control rules of multiple throttle valves, and makes the control method simpler and more practical.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a fresh air handling unit which comprises a fan shell and a control unit. The fan shell is provided with an air supply duct and an air return duct. A fresh air filter, an evaporator, a heater and an air supply fan are sequentially arranged in the air supply duct at intervals in the air supply direction; a return air filter, a condenser, a compressor and an exhaust fan are sequentially arranged in the return air duct at intervals in the return air direction; the heater is provided with a frequency conversion fan used for blowing air towards the side of the evaporator so as to change the amount of air flowing through the heater. And a temperature sensor is arranged in an air supply outlet of the air supply duct. According to the fresh air handling unit, the rotating speed of the frequency conversion draught fan is changed according to the air temperature monitored by the temperature sensor so as to adjust the air volume flowing through the heater, and therefore the effect of adjusting the air temperature is achieved, the air temperature does not need to be adjusted by adjusting the medium flow of the heater, the control rule of a plurality of throttling valves does not need to be considered, and the control mode is simpler and more convenient. The practicability is high.
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Description

Technical Field

[0001] The utility model relates to the technical field of heating and ventilation equipment, in particular to a fresh air unit. Background Art

[0002] Heating and ventilation equipment is used to supply air to the room, also known as a fresh air unit. Heating and ventilation equipment includes fresh air ducts and return air ducts. The fresh air duct is used to deliver fresh air to the room, and the return air duct is used to discharge the return air from the room to the outside. The fresh air duct will be equipped with an evaporator and a heater, and the return air duct will be equipped with a condenser and a compressor. The compressor, evaporator, condenser, expansion valve, etc. form a refrigeration system, and the evaporator is used to cool and dehumidify the fresh air. The heater and condenser are connected through a medium flow channel. The heater can be regarded as an auxiliary condenser, which uses the condensation heat of the condenser to heat the cooled fresh air to raise the temperature of the fresh air to an appropriate temperature.

[0003] In order to control the outlet air temperature, the prior art uses a sub-throttle valve on the medium flow path of the heater and the condenser to adjust the medium flow through the heater. The control method of controlling the flow is complicated, because the medium of the heater and the refrigeration system is mutually circulated, and the size of the medium flow of the heater will affect the medium flow entering the evaporator, so it is necessary to adjust the main throttle valve that controls the flow of the evaporator accordingly. The control rules of the main throttle valve and the sub-throttle valve can only be mastered through a large number of tests, but in situations where the dehumidification load changes greatly, unreasonable distribution will occur.

[0004] In view of this, it is necessary to provide a new air unit with a simpler control method for adjusting the air temperature. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and provide a fresh air unit with a simpler control method for adjusting the air temperature.

[0006] The technical solution of the utility model provides a fresh air unit, including a fan housing with an air supply duct and a return air duct and a control unit;

[0007] The air supply duct is provided with a fresh air filter, an evaporator, a heater and an air supply fan in sequence and at intervals along the air supply direction;

[0008] The return air duct is provided with a return air filter, a condenser, a compressor and an exhaust fan in sequence and at intervals along the return air direction;

[0009] Wherein, the heater is connected to the condenser through a medium pipeline, and along the width direction of the air supply duct, the length of the heater is smaller than the length of the evaporator;

[0010] The heater is provided with a variable frequency fan for blowing air toward the evaporator side to change the air volume flowing through the heater;

[0011] A temperature sensor is provided in the air supply port of the air supply duct;

[0012] The temperature sensor and the variable frequency fan are respectively connected to the control unit by signal.

[0013] In one of the optional technical solutions, one end of the heater is arranged flush with one end of the evaporator along the width direction of the air supply duct.

[0014] In one of the optional technical solutions, the ratio of the length of the heater to the length of the evaporator along the width direction of the air supply duct is between 2 / 5 and 3 / 5.

[0015] In one of the optional technical solutions, a heat exchanger is provided in the return air duct downstream of the condenser.

[0016] In one of the optional technical solutions, a humidifier is provided in the air supply duct downstream of the heater.

[0017] In one of the optional technical solutions, the fresh air filter includes a primary filter and a medium filter that are arranged at intervals.

[0018] In one of the optional technical solutions, the primary filter is a filter screen, and the secondary filter is an electrostatic filter.

[0019] In one of the optional technical solutions, the fan housing includes a lower housing and an upper housing stacked on the lower housing, the return air duct is arranged in the lower housing, and the supply air duct is arranged in the upper housing.

[0020] In one of the optional technical solutions, the lower shell and the upper shell are respectively formed by connecting a plurality of shell modules in sequence.

[0021] In one of the optional technical solutions, shock-absorbing springs are respectively provided at the bottom of the air supply fan and the exhaust fan.

[0022] The above technical solution has the following beneficial effects:

[0023] The fresh air unit provided by the utility model changes the rotation speed of the variable frequency fan according to the wind temperature monitored by the temperature sensor to adjust the air volume flowing through the heater, thereby achieving the effect of adjusting the wind temperature. There is no need to adjust the wind temperature by adjusting the medium flow of the heater, and there is no need to consider the control rules of multiple throttle valves. The control method is simpler and more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0025] Figure 1 A front view of a fresh air unit provided in one embodiment of the utility model;

[0026] Figure 2 for Figure 1 A top view of the fresh air unit shown;

[0027] Figure 3 A top view showing an evaporator and a heater installed in a housing module;

[0028] Figure 4 A front view of an air supply fan installed in a housing module;

[0029] Figure 5 A front view of an exhaust fan installed in a housing module;

[0030] Figure 6 It is a schematic diagram of the signal connection between each electrical component and the control unit. DETAILED DESCRIPTION

[0031] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings. The same parts are represented by the same figure numbers. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0032] like Figure 1-6 As shown, an embodiment of the utility model provides a fresh air unit, including a fan housing 100 having an air supply duct 103 and a return air duct 104 and a control unit 200.

[0033] In the air supply duct 103, a fresh air filter 1, an evaporator 2, a heater 3 and an air supply fan 4 are sequentially arranged at intervals along the air supply direction.

[0034] In the return air duct 104, a return air filter 5, a condenser 6, a compressor 7 and an exhaust fan 8 are sequentially arranged at intervals along the return air direction.

[0035] The heater 3 is connected to the condenser 6 via a medium pipeline, and along the width direction of the air supply duct 103 , the length of the heater 3 is smaller than the length of the evaporator 2 .

[0036] The heater 3 is provided with a variable frequency fan 31 for blowing air toward the evaporator 2 side to change the amount of air flowing through the heater 3 .

[0037] A temperature sensor 300 is provided in the air outlet 1032 of the air supply duct 103 .

[0038] The temperature sensor 300 and the variable frequency fan 31 are respectively connected to the control unit 200 for signals.

[0039] The fresh air unit provided by the utility model is used to supply air to the room, and includes a fan housing 100, a control unit 200, a temperature sensor 300, a fresh air filter 1, an evaporator 2, a heater 3, a supply air fan 4, a return air filter 5, a condenser 6, a compressor 7 and an exhaust fan 8, etc.

[0040] The fan housing 100 has an air supply duct 103 and an air return duct 104. One end of the air supply duct 103 has an air inlet 1031, and the other end thereof has an air supply duct 1032. Fresh air enters the air supply duct 103 through the air inlet 1031, and is then delivered into the room through the air supply duct 1032, a pipeline, and the like.

[0041] One end of the return air duct 104 has a return air port 1041, and the other end thereof has an exhaust port 1042. Indoor air enters the return air duct 104 through the return air port 1041, and then is exhausted to the outside through the exhaust port 1042.

[0042] The fresh air filter 1, the evaporator 2, the heater 3 and the air supply fan 4 are sequentially arranged in the air supply duct 103. The fresh air filter 1 is arranged near the air inlet 1031, and the air supply fan 4 is arranged near the air supply port 1032. The fresh air filter 1 is used to filter the fresh air, the evaporator 2 is used to cool and dehumidify the fresh air, the heater 3 is used to heat the cooled and dehumidified fresh air, and the air supply fan 4 is used to output the heated fresh air.

[0043] The return air filter 5, the condenser 6, the compressor 7 and the exhaust fan 8 are sequentially arranged in the return air duct 104. The return air filter 5 is arranged near the return air port 1041, and the exhaust fan 8 is arranged near the exhaust air port 1042. The return air filter 5 is used to filter the return air. The evaporator 2, the condenser 6, the compressor 7, the throttle valve, etc. constitute a refrigeration system. The exhaust fan 8 is used to discharge the return air to the outside.

[0044] The heater 3 is connected to the condenser 6 through a medium pipeline. The heater 3 can be regarded as an auxiliary condenser. It heats the fresh air flowing through by releasing heat and utilizes the condensation heat generated by the condenser 6 so that the condensation heat can be effectively utilized.

[0045] In the height direction, the evaporator 2 and the heater 3 are connected to the upper and lower surfaces of the air supply duct 103. In the width direction of the air supply duct 103, the length of the heater 3 is less than the length of the evaporator 2, and a portion of the evaporator 2 is exposed to the heater 3, and the fresh air sent out from this portion basically does not pass through the heater 3. Generally, the temperature of the fresh air entering the room is between 18°C ​​and 24°C. In general, the temperature of the fresh air after being heated by the heater will be higher than 4°C, so it is necessary to reduce the air volume heated by the heater 3 to reduce the outlet air temperature.

[0046] The heater 3 is equipped with a variable frequency fan 31, which is used to blow air toward the evaporator 2 side, so as to change the air volume flowing through the heater 3. When the variable frequency fan 31 does not rotate, the fresh air flowing out from the evaporator 2 and the heater 3 will be heated by the heater 3. When the variable frequency fan 31 is turned on, the fresh air flowing to the heater 3 will become less due to the resistance of the fan blowing. The higher the speed of the variable frequency fan 31, the more air blows, the less fresh air flows to the heater 3, and the lower the temperature of the heated fresh air.

[0047] The control unit 200 may be a chip, a microprocessor, etc., for controlling the switching of various electrical components.

[0048] The temperature sensor 300 is disposed in the air supply port 1032 to monitor the air supply temperature.

[0049] The variable frequency fan 31, the air supply fan 4, the compressor 7, the exhaust fan 8, the temperature sensor 300, etc. are connected to the control unit 200 through wires. The control unit 200 can control the switching of the variable frequency fan 31, the air supply fan 4, the compressor 7, and the exhaust fan 8.

[0050] The temperature sensor 300 transmits the monitored air supply temperature to the control unit 200. If the control unit 200 determines that the current air temperature is high, the speed of the variable frequency fan 31 is increased until the air temperature drops to a temperature that meets the requirements, and the current speed of the variable frequency fan 31 is maintained. If the control unit 200 determines that the current air temperature is low, the speed of the variable frequency fan 31 is decreased until the air temperature rises to a temperature that meets the requirements, and the current speed of the variable frequency fan 31 is maintained.

[0051] To sum up, the fresh air unit provided by the utility model changes the speed of the variable frequency fan according to the wind temperature monitored by the temperature sensor 300 to adjust the air volume flowing through the heater 3, thereby achieving the effect of adjusting the wind temperature. There is no need to adjust the wind temperature by adjusting the medium flow of the heater 3, and there is no need to consider the control rules of multiple throttle valves. The control method is simpler and more practical.

[0052] In one embodiment, if Figure 2-3As shown, along the width direction of the air supply duct 103, one end of the heater 3 is arranged flush with one end of the evaporator 2, so that the other end of the heater 3 completely extends out of the heater 3, and the fresh air flowing through this end area is basically not heated by the heater 3.

[0053] In one embodiment, if Figure 2-3 As shown, along the width direction of the air supply duct 103, the ratio of the length of the heater 3 to the length of the evaporator 2 is between 2 / 5 and 3 / 5. The heater 3 can block 2 / 5 to 3 / 5 of the area of ​​the evaporator 2, meeting the requirement for regulating the air volume flowing through the heater 3.

[0054] In one embodiment, if Figure 1 As shown, a heat exchanger 10 is provided in the return air duct 104 downstream of the condenser 6. The heat exchanger 10 is connected to an external cold source through a pipeline to remove the excess condensation heat carried by the excess return air.

[0055] In one embodiment, if Figure 1 As shown, a humidifier 9 is provided downstream of the heater 3 in the air supply duct 103, which can be used to humidify the heated fresh air to prevent the air from being too dry, so as to improve the user's blowing experience. The humidifier 9 can be a wet film humidifier, and the humidification water tank 91 is provided in the return air duct 104, which is equipped with a water pump and connected to the humidifier 9 through a water pipe.

[0056] In one embodiment, if Figure 1 As shown, the fresh air filter 1 comprises a primary filter 11 and a medium filter 12 arranged at intervals. The primary filter 11 is used to filter large dust particles, and the medium filter 12 is used to filter small dust particles.

[0057] In one embodiment, the primary filter 11 is a filter screen with low cost, and the medium filter 12 is an electrostatic filter with good dust filtering effect.

[0058] In one embodiment, if Figure 1 As shown, the fan housing 100 includes a lower housing 101 and an upper housing 102 stacked on the lower housing 101, a return air duct 104 is arranged in the lower housing 101, and an air supply air duct 103 is arranged in the upper housing 102. The stacked structure is conducive to saving installation space.

[0059] In one embodiment, if Figure 1-2 As shown, the lower housing 101 and the upper housing 102 are respectively formed by connecting a plurality of housing modules 105 in sequence, which is convenient for transportation and assembly. The housing module 105 is a box body with front and rear openings and is equipped with a door. The above-mentioned components can be configured separately in a housing module 105, or several components can be configured in one housing module 105.

[0060] In one embodiment, if Figure 4-5 As shown, the bottoms of the air supply fan 4 and the exhaust fan 8 are respectively provided with shock absorbing springs to play a buffering and shock absorbing role. Specifically, the bottom of the air supply fan 4 is provided with a shock absorbing spring 41, and the bottom of the exhaust fan 8 is provided with a shock absorbing spring 81.

[0061] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0062] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the protection scope of the present invention.

Claims

1. A fresh air unit, characterized in that: It includes a fan housing with an air supply duct and a return air duct and a control unit; The air supply duct is provided with a fresh air filter, an evaporator, a heater and an air supply fan in sequence and at intervals along the air supply direction; The return air duct is provided with a return air filter, a condenser, a compressor and an exhaust fan in sequence and at intervals along the return air direction; Wherein, the heater is connected to the condenser through a medium pipeline, and along the width direction of the air supply duct, the length of the heater is smaller than the length of the evaporator; The heater is provided with a variable frequency fan for blowing air toward the evaporator side to change the air volume flowing through the heater; A temperature sensor is provided in the air supply port of the air supply duct; The temperature sensor and the variable frequency fan are respectively connected to the control unit by signal.

2. The fresh air unit according to claim 1, characterized in that: In the width direction of the air supply duct, one end of the heater is arranged flush with one end of the evaporator.

3. The fresh air unit according to claim 1, characterized in that: In the width direction of the air supply duct, the ratio of the length of the heater to the length of the evaporator is between 2 / 5 and 3 / 5.

4. The fresh air unit according to claim 1, characterized in that: A heat exchanger is provided in the return air duct downstream of the condenser.

5. The fresh air unit according to claim 1, characterized in that: A humidifier is provided in the air supply duct downstream of the heater.

6. The fresh air unit according to claim 1, characterized in that: The fresh air filter comprises a primary filter and a medium filter which are arranged at intervals.

7. The fresh air unit according to claim 6, characterized in that: The primary filter is a filter screen, and the medium filter is an electrostatic filter.

8. The fresh air unit according to claim 1, characterized in that: The fan housing includes a lower housing and an upper housing stacked on the lower housing, the return air duct is arranged in the lower housing, and the supply air duct is arranged in the upper housing.

9. The fresh air unit according to claim 8, characterized in that: The lower shell and the upper shell are respectively formed by sequentially connecting a plurality of shell modules.

10. The fresh air unit according to claim 1, characterized in that: Shock-absorbing springs are respectively provided at the bottom of the air supply fan and the exhaust fan.