Variable air volume centralized air supply system

Abstract

The utility model relates to a variable air volume centralized air supply system, which is characterized in that a plurality of refrigerating units are correspondingly connected with a plurality of air supply hosts respectively, one end of each air supply host is connected with a fresh air fan, the fresh air fan corresponds to an evaporator through a filter window and a first temperature sensor, and the evaporator is externally connected with an air supply pipe sequentially through a centrifugal fan and a second temperature sensor. A pressure sensor, a one-way valve, an electromagnetic valve and an electric air valve are sequentially arranged on the air supply pipe outwards, the air supply pipes of any two or more air supply main machines are jointly connected with a main air pipe, an air volume sensor, a main temperature sensor and a main pressure sensor are sequentially arranged on the main air pipe, the main air pipe is connected with one or more indoor air supply pipes, and indoor exhaust air is externally connected through an exhaust pipe. And an exhaust manual air valve and an exhaust electric air valve are arranged on the exhaust pipe. The multiple air supply main machines are selectively started to be combined to supply air after being combined through the main air pipe, and the large-span variable air volume requirement can be met on the basis that the air volume regulation and control precision is considered.

Description

Technical Field

[0001] This utility model relates to an air supply system, specifically a variable air volume centralized air supply system. Background Technology

[0002] In existing centralized air supply technologies, there are generally two approaches. One is to use high-power main units to supply air separately. Since the main units have large power, there is a lot of energy waste when the air supply demand at the terminal is not large. The other is to use a structure of multiple main units, with each main unit responsible for a portion of the air supply demand. Although this can solve the problem of not needing to start a high-power main unit when the air supply demand at the terminal is not large, it is limited by the power of a single main unit. When the air supply demand at the terminal varies greatly, it cannot meet the needs of large-scale variable air volume air supply applications. Summary of the Invention

[0003] This invention provides a simple structure that can meet the needs of large-span variable air volume while ensuring the accuracy of air volume control.

[0004] The technical solution adopted by this utility model is: a variable air volume centralized air supply system, including multiple outdoor refrigeration units and multiple air supply main units. Each refrigeration unit is connected to an air supply main unit via a gas pipe and a liquid pipe. The system is characterized in that: one end of the air supply main unit is connected to a fresh air fan, the fresh air fan outlet is connected to the outside through a filter window, a first temperature sensor is installed between this end and the evaporator inside the air supply main unit, a centrifugal fan and a second temperature sensor are installed sequentially between the evaporator and the other end of the air supply main unit, the other end of the air supply main unit is connected to an air supply pipe, a pressure sensor, a one-way valve, a solenoid valve and an electric air valve are installed sequentially on the air supply pipe facing outwards, the air supply pipes of any two or more air supply main units are connected to a main air duct, a flow sensor, a main temperature sensor and a main pressure sensor are installed sequentially on the main air duct, the main air duct is connected to one or more indoor air supply units, the indoor exhaust air is connected to the outside through an exhaust duct, and a manual exhaust air valve and an electric exhaust air valve are installed on the exhaust duct.

[0005] The refrigeration unit includes a compressor, an oil separator, a condenser, an axial flow fan, a fluorinated ball valve, and a gas-liquid separator. The compressor exhaust passes sequentially through the oil separator, the condenser, and the fluorinated ball valve, and is connected to the air supply unit via a gas pipe. The air supply unit is connected back to the compressor return end via the fluorinated ball valve and the gas-liquid separator. An axial flow fan is correspondingly installed on the condenser.

[0006] The liquid phase of the oil separator is connected back to the compressor return gas end via a valve-controlled pipeline.

[0007] The evaporator inside the air supply unit is connected to the refrigeration unit via a built-in liquid storage tank, filter, and electronic expansion valve.

[0008] The main air duct is also equipped with a manual air supply valve after the pressure sensor and an electric air supply valve after the air volume sensor.

[0009] The main air duct is connected to one or more indoor air distributors.

[0010] The air distributor is a variable air volume air distributor.

[0011] An anemometer is installed at the outlet of the air distributor.

[0012] Multiple anemometers are evenly distributed or arranged in an array at the outlet of the air distributor.

[0013] The beneficial effects of this utility model are as follows: Two or more air supply units share a main duct. A centrifugal fan and temperature sensor at the front of the air supply duct control the output temperature of each air supply unit. Pressure and on / off control are monitored on the air supply duct, thus merging the air supply to the main duct. Air volume, temperature, pressure, and manual or automatic on / off control are monitored on the main duct. Finally, air is supplied to multiple indoor variable air volume (VAV) distributors to complete the terminal VAV air supply. An anemometer is installed at the distributor outlet to monitor the air volume of each room at multiple points. The supply air temperature, pressure, and air volume are controllable and highly accurate. When the air volume demand in a single room or all rooms requiring air supply is low, the air supply units are selectively activated. When the air volume demand in all rooms requiring air supply is high, multiple air supply units are selectively activated and merged through the main duct before air is supplied. This approach can meet the demand for large-span VAVs while maintaining accurate air volume control. Attached Figure Description

[0014] Figure 1 This is a schematic diagram showing the connection principle of the refrigeration unit and the air supply unit of this utility model;

[0015] Figure 2 This is a schematic diagram of the air supply structure of the air supply unit of this utility model.

[0016] In the diagram: Refrigeration unit 1, compressor 2, oil separator 3, valve 4, condenser 5, axial fan 6, fluorine ball valve 7, gas-liquid separator 8, charging port 9, air supply unit 10, filter window 11, fresh air unit 12, first temperature sensor 13, evaporator 14, centrifugal fan 15, second temperature sensor 16, liquid storage tank 17, filter 18, electronic expansion valve 19, air supply duct 20, pressure sensor 21, one-way valve 22, solenoid valve 23, electric air valve 24, main air duct 25, air volume sensor 26, air supply electric air valve 27, main temperature sensor 28, main pressure sensor 29, air supply manual air valve 30, indoor unit 31, exhaust duct 32, exhaust manual air valve 33, exhaust electric air valve 34, air distributor 35, anemometer 36. Detailed Implementation

[0017] The following description, in conjunction with the accompanying drawings and embodiments, provides further details.

[0018] Figure 1As shown: A variable air volume centralized air supply system includes multiple outdoor refrigeration units 1 and multiple air supply main units 10. Each refrigeration unit 1 includes a compressor 2, an oil separator 3, a condenser 5, an axial flow fan 6, a refrigerant ball valve 7, and a gas-liquid separator 8. The exhaust end of the compressor 1 is connected to the air supply main unit 10 via the oil separator 3, the condenser 5, the refrigerant ball valve 7, and a gas pipe. The liquid phase of the oil separator 3 is connected back to the return gas end of the compressor 1 via a valve 4. The air supply main unit 10 is connected back to the return gas end of the compressor 1 via the refrigerant ball valve 7, the charging port 9, the gas-liquid separator 8, and a liquid pipe. The condenser 5 is equipped with a corresponding axial flow fan 6. Each refrigeration unit 1 is connected to one air supply main unit 10. The air supply main unit 10 is connected to the refrigeration unit 1 and is connected back to the refrigeration unit 1 via a liquid storage tank 17, a filter 18, an electronic expansion valve 19, and an evaporator 14.

[0019] Combination Figure 1 , 2 As shown, the air supply unit 10 receives air through the fresh air fan 12 and filter window 11, and passes through the first temperature sensor 13 to one side of the evaporator 14. The other side of the evaporator 14 is connected to the air supply pipe 20 through the centrifugal fan 15 and the second temperature sensor 14. The air supply pipe 20 is equipped with a pressure sensor 21, a one-way valve 22, a solenoid valve 23, and an electric air valve 24 in sequence. The air supply pipes 20 corresponding to two or more air supply units 10 are connected to the main air pipe 25. The main air pipe 25 is equipped with an air volume sensor 26, an electric air supply valve 27, a main temperature sensor 28, a main pressure sensor 29, and a manual air supply valve 30 in sequence. The main air pipe 25 is connected to multiple indoor air distributors 35. The air distributors are variable air volume air distributors. Multiple anemometers 36 are evenly distributed or arrayed on the outlet of the air distributors. The indoor air distributors 31 are connected to the outside through the exhaust pipe 32. The exhaust pipe 32 is equipped with an exhaust manual air valve 33 and an exhaust electric air valve 34 in sequence.

[0020] In this embodiment, each air supply host 10 is connected to a fresh air fan 12. Multiple air supply hosts corresponding to the same main air duct can also be centralized in one station building by means of centralized control and merging, with one fresh air fan configured in one station building.

Claims

1. A variable air volume centralized air supply system, comprising a plurality of outdoor chillers and a plurality of air supply units, each chiller being connected to a corresponding air supply unit via a gas pipe and a liquid pipe, characterized in that: The air supply host one end accesses the fresh air machine, the fresh air machine outer mouth passes through the filter window, the first temperature sensor is arranged between the end and the evaporator in the air supply host, the centrifugal fan and the second temperature sensor are sequentially arranged between the evaporator and the other end of the air supply host, the air supply pipe is externally connected to the other end of the air supply host, the pressure sensor, the one-way valve, the electromagnetic valve, the electric air valve are sequentially arranged on the air supply pipe, the air supply pipes of any two or more air supply hosts are commonly connected to the main air pipe, the air volume sensor, the main temperature sensor and the main pressure sensor are sequentially arranged on the main air pipe, the main air pipe is branched to one or more indoor air supply, the indoor exhaust air is externally connected to the exhaust air pipe, the exhaust air manual air valve and the exhaust air electric air valve are arranged on the exhaust air pipe.

2. The variable air volume centralized air supply system of claim 1, wherein: The refrigeration unit comprises a compressor, an oil separator, a condenser, an axial flow fan, a fluorine ball valve and a gas-liquid separator, the compressor exhaust is sequentially connected to the air supply host through the oil separator, the condenser and the fluorine ball valve, the air supply host is connected to the compressor back gas end through the fluorine ball valve and the gas-liquid separator, and the condenser is correspondingly provided with the axial flow fan.

3. The variable air volume (VAV) centralized air supply system of claim 2, wherein: The liquid phase of the oil separator is connected to the compressor back gas end through the valve control pipeline.

4. The variable air volume (VAV) centralized air supply system of claim 1, wherein: The evaporator in the air supply host is connected to the refrigeration unit through the liquid storage tank, the filter and the electronic expansion valve in the refrigeration unit.

5. The variable air volume (VAV) centralized air supply system of claim 1, wherein: The main air pipe is further provided with the air supply manual air valve after the pressure sensor and the air supply electric air valve after the air volume sensor.

6. The variable air volume (VAV) centralized air supply system of claim 1, wherein: The main air pipe is branched to one or more indoor air supply air distributors.

7. The variable air volume, centralized air supply system of claim 6, wherein: The air distributor is a variable air volume air distributor.

8. The variable air volume centralized air supply system according to claim 6 or 7, characterized in that: The air distributor outlet is provided with an air speed instrument.

9. The variable air volume, packaged air supply system of claim 8, wherein: Multiple air speed instruments are evenly distributed or arrayed on the air distributor outlet.

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