Air pipe interface device and application thereof

Abstract

The invention provides an air duct interface device and application thereof, and belongs to the field of energy conservation of environment purification air conditioning systems. The air pipe interface device comprises a first straight pipe section, an electric variable air volume valve, a second straight pipe section, a diameter-expanding straight pipe section, a variable-diameter pipe section and a third straight pipe section which are sequentially connected, a flow equalizing plate is arranged at the end of the end, connected with the variable-diameter pipe section, of the diameter-expanding straight pipe section, and the other end of the diameter-expanding straight pipe section is open. The second straight pipe section is inserted into the diameter-expanding straight pipe section from the open end and makes contact with the flow equalizing plate. The air pipe interface devices are arranged between the fresh air handling unit and all the air conditioning units, in the system operation process, the position of the zero pressure point can be kept unchanged at the position of the flow equalizing plate all the time, operation of the air conditioning units is not affected by upstream pressure changes, and the system reliability is improved. And the multiple air conditioning units which are connected in parallel do not influence one another, and it is guaranteed that the system can operate stably.

Description

Technical Field

[0001] This invention belongs to the field of energy-saving air conditioning systems for clean environments, and specifically relates to a duct interface device and its application. Background Technology

[0002] Under the dual-carbon development goals, energy-saving design of air conditioning systems, a major energy consumer in buildings, will play a crucial role. In cleanroom air conditioning systems, all-air conditioning systems are used to meet the cleanliness requirements of the clean environment. Simultaneously, clean areas have temperature and humidity control requirements. In all-air conditioning systems, to meet these requirements, summer operation involves a process of dehumidification via a surface cooler followed by heating via a heater, resulting in energy consumption due to the offsetting of cooling and heating. Fresh air pretreatment is one effective energy-saving method. Fresh air dehumidification and cooling are completed in the fresh air handling unit AHU-0, and then mixed with return air in air conditioning units AHU-1, 2, and 3 for dry cooling or reheating, without condensate generation, thus preventing excessive humidity in the air conditioning units from breeding bacteria. However, because an additional fresh air handling unit AHU-0 is added in front of air conditioning units AHU-1, 2, and 3 to centrally handle fresh air, the air volume in the fresh air branch pipes connected to each air conditioning unit will be affected by changes in the fresh air volume of each air conditioning unit and the resistance of the fresh air ducts. This causes mutual interference of the fresh air volume of each air conditioning system. At the same time, since the fans in the fresh air handling unit and the air conditioning units behind it are different models connected in series, there will be a zero pressure point interface problem. The operation of the air conditioning units will be affected by changes in upstream pressure, thus affecting their stable operation. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art and provide a duct interface device and its application, which can always ensure that the zero pressure point position remains unchanged during system operation, so that the operation of the air conditioning unit is not affected by upstream pressure changes and can operate stably.

[0004] This invention is achieved through the following technical solution:

[0005] In a first aspect, the present invention provides a duct interface device, comprising a first straight pipe section, an electrically operated variable air volume valve, a second straight pipe section, an expanded diameter straight pipe section, a reduced diameter pipe section, and a third straight pipe section connected in sequence, wherein a flow equalization plate is provided at one end of the expanded diameter straight pipe section connected to the reduced diameter pipe section.

[0006] The other end of the expanded diameter straight pipe section is open, and the second straight pipe section is inserted into the expanded diameter straight pipe section from the open end and comes into contact with the flow equalization plate.

[0007] A further improvement of the present invention is that:

[0008] The diameter of the expanded straight pipe section is larger than the diameter of the second straight pipe section, so that an annular structure is formed between the second straight pipe section and the expanded straight pipe section;

[0009] The larger diameter end of the variable diameter pipe section is connected to the expanded diameter straight pipe section.

[0010] A further improvement of the present invention is that:

[0011] The diameter D1 of the first straight pipe section is equal to the diameter of the electric variable air volume valve, and the length L1 of the first straight pipe section is greater than or equal to (1.5 × D1).

[0012] A further improvement of the present invention is that:

[0013] The diameter of the second straight pipe section is the same as the diameter D1 of the first straight pipe section, and the length L3 of the second straight pipe section is greater than or equal to (0.5 × D1 + L4).

[0014] Where L4 is the length of the expanded diameter straight pipe section, and L4 is greater than or equal to 200mm.

[0015] A further improvement of the present invention is that:

[0016] The diameter of the expanded straight pipe section is D4 = 2 × D1;

[0017] The diameter of the third straight pipe section

[0018] The length of the variable diameter pipe section is L5 = 2 × (D4 - D6).

[0019] A second aspect of the present invention provides a purification air conditioning system, including a fresh air handling unit, wherein a plurality of first fresh air branch pipes are connected to the fresh air main duct of the fresh air handling unit, each first fresh air branch pipe is connected to a duct interface device, and each duct interface device is connected to an air conditioning unit.

[0020] A further improvement of the present invention is that:

[0021] The fresh air handling unit includes a fresh air handling unit chassis, on which a fresh air inlet and a fresh air outlet are provided. One end of the fresh air main duct is connected to the fresh air outlet, and the other end is connected to the first straight pipe section of the plurality of duct interface devices through a first fresh air branch duct.

[0022] A further improvement of the present invention is that:

[0023] The fresh air handling unit is equipped with a first variable frequency fan inside its casing.

[0024] A pressure sensor is installed on the main fresh air duct, and the pressure sensor is connected to the first variable frequency fan.

[0025] A further improvement of the present invention is that:

[0026] The air conditioning unit includes an air conditioning unit casing, with a fresh air inlet and a return air inlet at one end of the air conditioning unit casing and a supply air outlet at the other end;

[0027] The fresh air inlet is connected to the third straight pipe section in the duct interface device via the second fresh air branch pipe, the return air inlet is connected to one end of the return air main pipe, and the supply air inlet is connected to the supply air main pipe.

[0028] A further improvement of the present invention is that:

[0029] A first air volume measuring instrument is installed on the main air supply duct, and a second air volume measuring instrument is installed on the main return air duct. Both the first and second air volume measuring instruments are connected to an air volume controller, which is electrically connected to the electric variable air volume valve in the duct interface device.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] The duct interface device of the present invention has a flow equalization plate at one end of the connection between the expanded diameter straight pipe section and the reduced diameter pipe section. The second straight pipe section is inserted into the expanded diameter straight pipe section from the open end and contacts the flow equalization plate, so that the system is connected to the atmosphere through the flow equalization plate. The relative pressure of the interface is 0 Pa, so that the zero pressure point position is always kept at the position of the flow equalization plate, ensuring the stable operation of the system.

[0032] This invention, by setting up duct interface devices between the fresh air handling unit and the air conditioning unit, can keep the zero pressure point position constant at the position of the flow equalization plate during system operation, so that the operation of the air conditioning unit is not affected by upstream pressure changes and can operate stably.

[0033] This invention connects a first air volume measuring instrument installed on the main supply air duct and a second air volume measuring instrument installed on the main return air duct of the air conditioning unit to an air volume controller. The air volume controller is electrically connected to an electric variable air volume valve in the duct interface device. The air volume controller receives the total supply air volume value detected by the first air volume measuring instrument and the total return air volume value detected by the second air volume measuring instrument, calculates the difference between the two, and sends the calculated difference to the electric variable air volume valve in the duct interface device. The electric variable air volume valve controls the opening and closing size according to the received difference signal, thereby controlling the fresh air volume entering the air conditioning unit. In this invention, since each air conditioning unit's fresh air branch duct is connected to an duct interface device, multiple air conditioning units connected in parallel do not affect each other, ensuring that each air conditioning unit can operate stably and without interference. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a duct interface device according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the air-conditioning purification system in an embodiment of the present invention.

[0036] In the picture,

[0037] 1. First straight pipe section; 2. Electric variable air volume valve; 3. Second straight pipe section; 4. Expanded diameter straight pipe section; 5. Flow equalization plate; 6. Variable diameter pipe section; 7. Third straight pipe section.

[0038] 8. Fresh air handling unit; 9. Air conditioning unit;

[0039] 10. First coarse filter; 11. First surface cooler; 12. First variable frequency fan; 13. First medium-efficiency filter; 14. Pressure sensor; 15. First air volume measuring instrument; 16. Second air volume measuring instrument; 17. Air volume controller; 18. Fresh air and return air mixing section; 19. Second surface cooler; 20. Second variable frequency fan; 21. Heating device; 22. Dry steam humidification device; 23. High and medium efficiency filter; 24. Air supply section. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings:

[0041]

Example 1

[0042] like Figure 1 As shown, this embodiment of the invention provides a duct interface device, comprising a first straight pipe section 1, an electric variable air volume valve 2, a second straight pipe section 3, an expanded diameter straight pipe section 4, a variable diameter pipe section 6, and a third straight pipe section 7 connected in sequence. A flow equalization plate 5 is provided at one end of the expanded diameter straight pipe section 4 connected to the variable diameter pipe section 6.

[0043] The other end of the expanded diameter straight pipe section 4 is open, and the second straight pipe section 3 is inserted into the expanded diameter straight pipe section 4 from the open end and comes into contact with the flow equalization plate 5.

[0044] Preferably, the size and shape of the flow equalization plate 5 are the same as the size and shape of the end of the expanded diameter straight pipe section 4. The flow equalization plate 5 is evenly provided with several through holes, connecting the first straight pipe section 1 to the air outlet pipe of the fresh air unit, and the third straight pipe section 7 to the downstream fresh air branch pipe. The air treated by the fresh air unit will pass through the first straight pipe section 1, the electric variable air volume valve 2, the second straight pipe section 3 and the expanded diameter straight pipe section 4 in sequence, and then be evenly diffused to the downstream fresh air branch pipe through the flow equalization plate 5.

[0045] Preferably, the diameter of the expanded straight pipe section 4 is larger than the diameter of the second straight pipe section 3, so that an annular structure is formed between the second straight pipe section 3 and the expanded straight pipe section 4. Since the larger diameter end of the variable pipe section 6 is connected to the expanded straight pipe section 4, and a flow equalization plate 5 is provided at the connection between the expanded straight pipe section 4 and the variable pipe section 6, the inside of the pipe section is connected to the atmosphere through the flow equalization plate 5, and the relative pressure at the interface is 0 Pa, so that the zero pressure point position is always kept at the position of the flow equalization plate 5.

[0046] The second straight pipe section 3 has one open end of the expanded diameter straight pipe section 4 inserted into the expanded diameter straight pipe section 4 and extending to the other end to contact the flow equalization plate 5. In this way, there is a certain length L4 of protection before the flow equalization plate 5, which ensures that the fresh air delivered can enter the fresh air branch pipe connected to the third straight pipe section 7 downstream, and is not sent to the outside.

[0047] Preferably, the two ends of the electric variable air volume valve 2 are connected to the first straight pipe section 1 and the second straight pipe section 3 respectively via flanges, and the two ends of the variable diameter pipe section 6 are connected to the expanded diameter straight pipe section 4 and the third straight pipe section 7 respectively via flanges.

[0048]

Example 2

[0049] The diameter D1 of the first straight pipe section 1 is equal to the diameter of the electric variable air volume valve 2. According to the normal operation requirements of the electric variable air volume valve 2, the length L1 of the first straight pipe section 1 is greater than or equal to (1.5 × D1).

[0050] Among them, the electric variable air volume valve 2 is a commercially available product, and its diameter and length L2 can be directly known.

[0051] The diameter of the second straight pipe section 3 is the same as the diameter D1 of the first straight pipe section 1. According to the normal operation requirements of the electric variable air volume valve 2, the length L3 of the second straight pipe section 3 is greater than or equal to (0.5×D1+L4).

[0052] The diameter D1 of the first straight pipe section is equal to the diameter of the electric variable air volume valve. According to the normal operation requirements of the variable air volume valve, the length L1 of the first straight pipe section is greater than or equal to (1.5 × D1).

[0053] The length L2 of the electric variable air volume valve is the same as the size of the selected valve;

[0054] The diameter of the second straight pipe section is equal to D1. According to the normal operation requirements of the variable air volume valve, the length of the second straight pipe section L3 ≥ (0.5 × D1 + L4).

[0055] Where L4 is the length of the expanded diameter straight pipe section 4, which is the length of the second straight pipe section inserted into the expanded diameter straight pipe section. This ensures that the second straight pipe section 3 reaches the position of the flow equalization plate 5, so that the airflow can blow towards the flow equalization plate. L4 is greater than or equal to 200mm. In order to protect the fresh air supplied to the fresh air branch pipe from entering the air conditioning unit, theoretically, the longer the length L4 of the expanded diameter straight pipe section 4, the better, and it cannot be too small.

[0056] The diameter of the expanded straight pipe section 4 is D4 = 2 × D1.

[0057] The larger diameter end of the reducing pipe section 6 is connected to the expanding straight pipe section 4, and its diameter is the same as that of the expanding straight pipe section 4. The smaller diameter end of the reducing pipe section 6 is connected to the third straight pipe section 7, and its diameter is the same as that of the third straight pipe section.

[0058] When connecting ducts with different diameters, the length L5 of the variable diameter section 6 is 2×(D4-D6), which can both ensure the airflow pattern and facilitate manufacturing.

[0059] Based on experience, the diameter of the third straight pipe section 7... Length L6 = L1.

[0060]

Example 3

[0061] like Figure 2 As shown, this embodiment of the invention provides a purification air conditioning system, including a fresh air unit 8. The fresh air main duct of the fresh air unit 8 is connected to a plurality of first fresh air branch ducts. Each first fresh air branch duct is connected to a duct interface device, and each duct interface device is connected to an air conditioning unit 9.

[0062] In existing technologies, because the fans in the fresh air handling unit and the connected air conditioning unit are different models connected in series, changes in the working resistance of the fresh air handling unit during airflow adjustment cause changes in the downstream pressure, resulting in a change in the zero-pressure point between the fresh air handling unit and the air conditioning unit. This causes the air conditioning unit to be affected by upstream pressure changes, impacting its stable operation. This invention addresses this by installing duct interface devices between the fresh air handling unit 8 and the air conditioning unit 9. During system operation, the zero-pressure point is consistently maintained at the position of the flow equalization plate 5, ensuring that the operation of the air conditioning unit 9 is unaffected by upstream pressure changes and guaranteeing stable system operation.

[0063]

Example 4

[0064] The fresh air unit 8 includes a fresh air unit chassis, on which a fresh air inlet and a fresh air outlet are provided. One end of the fresh air main pipe is connected to the fresh air outlet, and the other end is connected to the first straight pipe section 1 of the plurality of air duct interface devices through a first fresh air branch pipe.

[0065] The fresh air handling unit's casing is provided with a first coarse filter 10, a first surface cooler 11, a first variable frequency fan 12, and a first medium-efficiency filter 13 arranged sequentially along the air supply direction;

[0066] A pressure sensor 14 is installed on the fresh air main duct. The pressure sensor 14 is connected to the first variable frequency fan 12. The pressure sensor 14 detects the pressure value of the fresh air main duct in real time. When the detected pressure value is greater than or less than the set value (e.g., 300Pa), the pressure sensor 14 will automatically control the speed or frequency of the first variable frequency fan 12 to adjust the air speed so that the pressure value of the fresh air main duct reaches the set value.

[0067] The first coarse filter 10, the first surface cooler 11, the first variable frequency fan 12, and the first medium-efficiency filter 13 all use existing technology products, and will not be described in detail here.

[0068]

Example 5

[0069] The air conditioning unit 9 includes an air conditioning unit casing. One end of the air conditioning unit casing is provided with a fresh air inlet and a return air inlet, and the other end is provided with a supply air outlet. The fresh air inlet is connected to the third straight pipe section 7 in the air duct zero-pressure point interface device through a second fresh air branch pipe. The return air outlet is connected to one end of the return air main pipe. The other end of the return air main pipe is connected to each room through multiple return air branch pipes. The supply air outlet is connected to each room through the supply air main pipe and multiple supply air branch pipes, so as to deliver the treated air to each room.

[0070] A first air volume measuring instrument 15 is installed on the main air supply duct, and a second air volume measuring instrument 16 is installed on the main return air duct. Both the first air volume measuring instrument 15 and the second air volume measuring instrument 16 are connected to an air volume controller 17. The air volume controller 17 is electrically connected to the electric variable air volume valve 2 in the duct interface device.

[0071] The first air volume measuring instrument 15 is used to monitor the total supply air volume in real time, and the second air volume measuring instrument 16 is used to monitor the total return air volume in real time. The air volume controller 17 receives the total supply air volume detected by the first air volume measuring instrument 15 and the total return air volume detected by the second air volume measuring instrument 16, calculates the difference between the two, and sends the calculated difference to the electric variable air volume valve 2 in the duct zero pressure point interface device. The electric variable air volume valve 2 controls the opening and closing size according to the received difference signal, thereby controlling the fresh air volume entering the air conditioning unit 9. In this invention, since each air conditioning unit 9 has a duct interface device connected to its second fresh air branch pipe, the multiple air conditioning units connected in parallel do not affect each other, ensuring that each air conditioning unit can operate stably.

[0072] Since the fresh air volume required by each air conditioning unit 9 is adjusted by the electric variable air volume valve 2, so that the air volume through its corresponding fresh air branch pipe reaches the required value, this will cause the air volume on the fresh air main pipe to change, and the pressure on the fresh air main pipe will change. At this time, the pressure sensor 14 on the fresh air main pipe sends a signal of the pressure change to the first variable frequency fan 12 to perform frequency conversion to adapt to the new working state.

[0073] When the electric variable air volume valve 2 adjusts the air volume, its working resistance changes, which causes pressure changes at its downstream end. This leads to changes in the zero-pressure point between the fresh air handling unit 8 and the air conditioning unit 9. The operation of the air conditioning unit 9 will be affected by upstream pressure changes. Because a flow equalization plate 5 is provided at one end of the connection between the expanded diameter straight pipe section 4 and the reduced diameter pipe section 6 in the duct interface device, and the second straight pipe section 3 is inserted into the expanded diameter straight pipe section 4 from the open end and contacts the flow equalization plate 5, the system is connected to the atmosphere through the flow equalization plate 5. The relative pressure at the interface is 0 Pa, so the zero-pressure point position is always kept at the position of the flow equalization plate 5. This ensures that the operation of the air conditioning unit 9 is not affected by upstream pressure changes and guarantees stable system operation.

[0074] Preferably, the air conditioning unit casing is provided with a fresh air and return air mixing section 18, a second surface cooler 19, a second variable frequency fan 20, a heating device 21, a dry steam humidification device 22, a high-efficiency filter 23 and an air supply section 24 arranged sequentially along the air supply direction.

[0075] The dry steam humidification device 22 is used in winter and not in summer. In summer, depending on the fresh air ratio, either the second surface cooler 19 is used while the heating device 21 is not used, or the second surface cooler 19 is not used while the heating device 21 is used. The energy-saving effect is different for different fresh air ratios.

[0076] The second surface cooler 19, the second variable frequency fan 20, the heating device 21, the dry steam humidification device 22, and the high-efficiency filter 23 all use existing technology products, and will not be described in detail here.

[0077] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0078] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0079] The above technical solution is only one embodiment of the present invention. For those skilled in the art, based on the principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the specific embodiments of the present invention. Therefore, the foregoing description is only a preferred option and is not restrictive.

Claims

1. A duct interface device, characterized in that, The system comprises a first straight pipe section, an electric variable air volume valve, a second straight pipe section, an expanded diameter straight pipe section, a reduced diameter pipe section, and a third straight pipe section connected in sequence. A flow equalization plate is provided at the end of the expanded diameter straight pipe section where it connects to the reduced diameter pipe section. The other end of the expanded diameter straight pipe section is open, and the second straight pipe section is inserted into the expanded diameter straight pipe section from the open end and comes into contact with the flow equalization plate.

2. The duct interface device according to claim 1, characterized in that, The diameter of the expanded straight pipe section is larger than the diameter of the second straight pipe section, so that an annular structure is formed between the second straight pipe section and the expanded straight pipe section; The larger diameter end of the variable diameter pipe section is connected to the expanded diameter straight pipe section.

3. The duct interface device according to claim 1, characterized in that, The diameter D1 of the first straight pipe section is equal to the diameter of the electric variable air volume valve, and the length L1 of the first straight pipe section is greater than or equal to (1.5 × D1).

4. The duct interface device according to claim 3, characterized in that, The diameter of the second straight pipe section is the same as the diameter D1 of the first straight pipe section, and the length L3 of the second straight pipe section is greater than or equal to (0.5 × D1 + L4). Where L4 is the length of the expanded diameter straight pipe section, and L4 is greater than or equal to 200mm.

5. The duct interface device according to claim 4, characterized in that, The diameter of the expanded straight pipe section is D4 = 2 × D1; The diameter of the third straight pipe section The length of the variable diameter pipe section is L5 = 2 × (D4 - D6).

6. A purification air conditioning system, characterized in that, The system includes a fresh air handling unit, wherein a plurality of first fresh air branch pipes are connected to the main fresh air duct of the fresh air handling unit, each of the first fresh air branch pipes is connected to a duct interface device as described in any one of claims 1-5, and each of the duct interface devices is connected to an air conditioning unit.

7. The air conditioning system according to claim 6, characterized in that, The fresh air handling unit includes a fresh air handling unit chassis, on which a fresh air inlet and a fresh air outlet are provided. One end of the fresh air main duct is connected to the fresh air outlet, and the other end is connected to the first straight pipe section of the plurality of duct interface devices through a first fresh air branch duct.

8. The air conditioning system according to claim 7, characterized in that, The fresh air handling unit is equipped with a first variable frequency fan inside its casing; A pressure sensor is installed on the main fresh air duct, and the pressure sensor is connected to the first variable frequency fan.

9. The air conditioning system according to claim 6, characterized in that, The air conditioning unit includes an air conditioning unit casing, with a fresh air inlet and a return air inlet at one end of the air conditioning unit casing and a supply air outlet at the other end; The fresh air inlet is connected to the third straight pipe section in the duct interface device via the second fresh air branch pipe, the return air inlet is connected to the return air main pipe, and the supply air inlet is connected to the supply air main pipe.

10. The air conditioning system according to claim 9, characterized in that, A first air volume measuring instrument is installed on the main air supply duct, and a second air volume measuring instrument is installed on the main return air duct. Both the first and second air volume measuring instruments are connected to an air volume controller, which is electrically connected to an electric variable air volume valve in the duct interface device.

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