Air-side economizer and air conditioning system

Abstract

The utility model provides an air side economizer, including the economizer casing, the fresh air chamber and the return air chamber of being separated to be located in the economizer casing, first return air port and second return air port, interval is located in the economizer casing and is connected return air chamber respectively, first return air duct and second return air duct, the indoor side of target unit is connected with first return air port, second return air port respectively, the length of first return air duct is less than second return air duct, a plurality of fresh air damper, be located in the confluence department of fresh air chamber and indoor side, be used for controlling the fresh air volume of the outdoor side of target unit and fresh air chamber into indoor side, a plurality of return air damper, be located in the confluence department of return air chamber and indoor side, be used for controlling the return air volume of return air chamber into indoor side, first pressure release port and second pressure release port, interval is set up in the confluence department of economizer casing and outdoor side and is matched first return air port and second return air port respectively, a plurality of first pressure release air valve and a plurality of second pressure release air valve, are located in first pressure release port and second pressure release port respectively.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to an air-side economizer and an air conditioning system using the same. Background Technology

[0002] An air-side economizer is an automatic control device for air conditioning ducts and valves. It introduces cooler outdoor air from mild or cold environments through a fresh air valve, and adjusts the ratio of fresh air to return air introduced into the indoor unit via the air conditioning system through the coordinated operation of the fresh air valve, return air valve, temperature sensor, electric valve actuator, and controller. Therefore, the air-side economizer can supply cooler outdoor air to the indoor unit during mild or cold weather, thus providing free cooling to reduce or eliminate the need for mechanical cooling in the air conditioning system. While improving the energy efficiency of the air conditioning system, it also improves indoor air quality, and its excellent economy and energy saving are leading to its increasing adoption.

[0003] An air-side economizer typically consists of a fresh air valve, a return air valve, and a pressure relief valve. The fresh air valve is located in the economizer's fresh air chamber and controls the amount of fresh air entering the room. The return air valve is located at the junction of the economizer's return air chamber and the unit's indoor chamber and controls the amount of return air entering the room. The pressure relief valve is located at the junction of the economizer's return air chamber and the unit's outdoor side and controls the amount of pressure relief air discharged to the outside from the economizer and the unit.

[0004] For rooftop air conditioners, due to their installation on the roof and the differences in housing structures, the ductwork structure and size connecting the rooftop unit to the indoor unit vary. Some rooftop units require a relatively long return air duct (extending a long path vertically) connecting the indoor cavity and the air-side economizer return air cavity of the rooftop unit. When the return air duct is too long, the negative pressure at the return air inlet connecting the duct to the air-side economizer return air cavity will be very high, resulting in a large pressure difference between the air-side economizer return air cavity and the indoor side of the unit. This further increases the pressure difference between the inside and outside of the air-side economizer's pressure relief valve, making it difficult for the valve to open and for air in the air-side economizer's return air cavity to be expelled outdoors. Simultaneously, the continuous introduction of fresh air through the fresh air valve, especially when the valve opening is large and the introduced fresh air volume is high, will further increase the indoor air pressure, thus affecting the user experience.

[0005] Therefore, existing technologies typically use a pressure relief fan to exhaust excess air from the return air chamber of the air-side economizer to the outside. However, this approach leads to increased costs and energy consumption, which is not in line with the development trend of energy conservation and environmental protection. Utility Model Content

[0006] This utility model proposes an air-side economizer and air conditioning system to solve the technical problem that when the return air duct is long, the pressure difference between the inside and outside of the pressure relief valve of the return air chamber is large, making it difficult to open the pressure relief valve.

[0007] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0008] This utility model provides an air-side economizer, including an economizer housing, a fresh air chamber and a return air chamber separated and disposed inside the economizer housing, and further including:

[0009] The first and second return air inlets are spaced apart on the economizer housing and are respectively connected to the return air chamber;

[0010] The first return air duct and the second return air duct are respectively connected to the indoor side of the target unit and the first return air outlet and the second return air outlet, and the length of the first return air duct is shorter than that of the second return air duct.

[0011] Several fresh air valves are located at the junction of the fresh air chamber and the indoor side to control the amount of fresh air entering the indoor side through the outdoor side and the fresh air chamber of the target unit.

[0012] Several return air dampers are located at the junction of the return air chamber and the indoor side to control the amount of return air entering the indoor side through the return air chamber.

[0013] The first pressure relief port and the second pressure relief port are spaced apart at the junction of the economizer housing and the outdoor side, and are respectively matched with the first return air port and the second return air port;

[0014] Several first pressure relief valves and several second pressure relief valves are respectively located at the first pressure relief port and the second pressure relief port.

[0015] Preferably, the area of ​​the first return air inlet is smaller than that of the second return air inlet.

[0016] Preferably, the economizer housing includes:

[0017] A pair of side panels positioned opposite each other;

[0018] The top plate connects to the corresponding top ends of a pair of side plates;

[0019] The bottom frame connects the corresponding bottom ends of a pair of side panels, with the first and second return air inlets separately located on the bottom frame.

[0020] A partition plate, connected between a pair of side plates, divides the internal space of the economizer housing into a fresh air cavity located between the top plate and the partition plate and a return air cavity located between the bottom frame and the partition plate;

[0021] A pressure relief frame is connected to the bottom plate, the partition plate and a pair of side plates at the end opposite to the return air cavity and the intersection of the indoor side, corresponding to the return air cavity. The first pressure relief port and the second pressure relief port are separately set on the pressure relief frame.

[0022] Preferably, the first pressure relief valve includes:

[0023] The first pressure relief blade is rotatably connected to the pressure relief frame at the first pressure relief port.

[0024] The first pressure relief drive device is used to drive the first pressure relief blade to rotate in order to adjust its opening relative to the first pressure relief port.

[0025] The second pressure relief valve includes:

[0026] The second pressure relief blade is rotatably connected to the pressure relief frame at the matching second pressure relief port;

[0027] The second pressure relief drive device is used to drive the second pressure relief blade to rotate in order to adjust its opening relative to the second pressure relief port.

[0028] Preferably, the fresh air valve includes:

[0029] The fresh air blades are rotatably connected between a pair of side plates and are located at the junction of the fresh air chamber and the indoor side;

[0030] Fresh air conditioning drive unit, used to drive the fresh air blades to rotate to adjust their opening relative to the indoor side;

[0031] Return air damper includes:

[0032] The return air blades are rotatably connected between a pair of side plates and are located at the junction of the return air cavity and the indoor side;

[0033] The return air adjustment drive is used to drive the return air blades to rotate in order to adjust their opening relative to the indoor side.

[0034] Preferably, a pair of side panels are arranged in parallel, the top panel and the bottom frame are arranged in parallel, and the bottom frame is perpendicularly connected to the side panels.

[0035] Preferably, the area of ​​the top plate is smaller than that of the bottom frame, and the cross-section of the economizer housing parallel to the side plate is trapezoidal.

[0036] This utility model also provides an air conditioning system, including the above-mentioned air-side economizer, with the target unit being the outdoor unit of the air conditioning system.

[0037] Preferably, the outdoor unit is a rooftop unit.

[0038] Preferably, the rooftop unit includes:

[0039] Unit casing; air supply duct, located at the junction of the lower layer inside the unit casing and the indoor side; air-side economizer installed at the junction of the lower layer inside the unit casing and the outdoor side and adjacent to the air supply duct.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The air-side economizer provided by this utility model, by setting a two-stage pressure relief valve, can still smoothly discharge excess air in the return air cavity even when the return air duct is long and the fresh air valve opening is large. This improves the ease of use, versatility and adaptability of the air-side economizer, can adapt to different operating conditions of the air-side economizer, and can reduce the energy consumption and cost of configuring the air-side economizer on the rooftop unit, which is in line with the development trend of energy conservation and environmental protection. Attached Figure Description

[0042] To more clearly illustrate the technical solution proposed by this utility model, the present utility model will be described in detail below with reference to the embodiments and accompanying drawings. It should be understood that the embodiments and accompanying drawings described in the following detailed description are merely some embodiments of this utility model, and those skilled in the art can make changes to these drawings under the concept of this utility model.

[0043] Figure 1 A three-dimensional structural diagram of an embodiment of the air-side economizer provided by this utility model, with the first and second return air ducts hidden;

[0044] Figure 2 for Figure 1 A three-dimensional structural diagram of the air-side economizer from another perspective;

[0045] Figure 3 A three-dimensional structural diagram of an embodiment of the target unit provided by this utility model, with the air-side economizer not installed and the economizer enclosure panel hidden.

[0046] Figure 4 for Figure 3 A three-dimensional structural diagram of the target unit after the air-side economizer is installed.

[0047] The main markings in the attached figures are as follows:

[0048] 1. Economizer housing; 11. Side panel; 12. Top panel; 13. Bottom frame; 131. First return air vent; 132. Second return air vent; 133. Frame body; 134. Hollowed-out area; 135. Air vent partition; 14. Divider plate; 15. Pressure relief frame; 151. First pressure relief port; 152. Second pressure relief port;

[0049] 2. Fresh air chamber; 3. Return air chamber;

[0050] 4. First return air duct; 41. First duct body; 42. First air inlet; 43. First air outlet; 431. First air outlet edge strip;

[0051] 5. Second return air duct; 51. Main body of the second air duct; 52. Second air inlet; 53. Second air outlet; 531. Second air outlet edge strip;

[0052] 6. Fresh air valve; 61. Fresh air blades; 62. Fresh air regulating drive device;

[0053] 7. Return air damper; 71. Return air blades; 72. Return air regulating drive device;

[0054] 8. First pressure relief valve; 81. First pressure relief blade;

[0055] 9. Second pressure relief valve; 91. Second pressure relief blade;

[0056] 10. Shaft;

[0057] 20. Target unit; 201. Unit casing; 2011. Economizer enclosure; 202. Air supply duct.

[0058] Other markings in the diagram are as follows:

[0059] A. Indoor side;

[0060] B. Outdoor side. Detailed Implementation

[0061] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following description is provided in conjunction with the appendix. Figure 1-4 The present invention will be further described in detail with reference to the embodiments.

[0062] Please refer to the following: Figure 1-4 The air-side economizer provided by this utility model includes an economizer housing 1, a fresh air chamber 2 and a return air chamber 3 separated inside the economizer housing 1.

[0063] The air-side economizer also includes:

[0064] The first return air inlet 131 and the second return air inlet 132 are spaced apart on the economizer housing 1 and are respectively connected to the return air cavity 3;

[0065] The first return air duct 4 and the second return air duct 5 are respectively connected between the indoor side A of the target unit 20 and the first return air outlet 131, and between the indoor side A of the target unit 20 and the second return air outlet 132, and the extension length of the first return air duct 4 in its extension direction is less than the extension length of the second return air duct 5 in its extension direction.

[0066] Several fresh air valves 6 are located at the junction of the fresh air cavity 2 and the indoor side A of the target unit 20, and are used to control the fresh air volume entering the indoor side A of the target unit 20 through the outdoor side B of the target unit 20 and the fresh air cavity 2.

[0067] Several return air valves 7 are located at the junction of the return air chamber 3 and the indoor side A of the target unit 20, and are used to control the return air volume entering the indoor side A of the target unit 20 through the return air chamber 3.

[0068] The first pressure relief port 151 and the second pressure relief port 152 are spaced apart at the junction of the economizer housing 1 and the outdoor side B, and are respectively matched with the first return air port 131 and the second return air port 132.

[0069] Several first pressure relief valves 8 and several first pressure relief valves 8 are respectively provided at the first pressure relief port 151 and the second pressure relief port 152.

[0070] Please refer to the following: Figure 1-4 In this embodiment, the air-side economizer provided by the present invention can be applied to air conditioning systems, especially rooftop units of outdoor units of air conditioning systems. The indoor side A of the outdoor unit (target unit 20) is connected to the indoor cavity of the house (not shown in the figure) and the indoor unit of the air conditioning system (not shown in the figure) located in the indoor cavity.

[0071] When the air-side economizer is installed, the economizer housing 1 of the air-side economizer is connected to the unit housing 201 of the rooftop unit, and the first return air inlet 131 and the second return air inlet 132, which are spaced apart on the economizer housing 1, are connected to the first return air duct 4 and the second return air duct 5, respectively. This allows the return air cavity 3 of the air-side economizer to be connected to the indoor cavity of the indoor side A of the outdoor unit (target unit 20) through the shorter second return air duct 5 and the longer first return air duct 4, respectively.

[0072] When the air-side economizer is in use, since the air volume required by the indoor unit of the air conditioning system is usually fixed, the fresh air from the outdoor unit (target unit 20) on the outdoor side B is either introduced into the indoor unit (target unit 20) on the indoor side A of the outdoor unit (target unit 20) through the fresh air cavity 2 by the fresh air valve 6 of the air-side economizer, or the return air from the indoor side A of the outdoor unit (target unit 20) is introduced into the indoor unit through the first return air duct 4 or the first return air duct 4 and the second return air duct 5 and the return air cavity 3 by the return air valve 7 of the air-side economizer. Therefore, the opening of each fresh air valve 6 and the return air valve 7 is adjusted synchronously, and the sum of the openings of each fresh air valve 6 and the sum of the openings of each return air valve 7 is 100%.

[0073] When the air conditioning system is set to provide return air only through the return air valve 7 without using the fresh air function, the total opening degree of each return air valve 7 is 100%, and the total opening degree of each fresh air valve 6 is 0%. When the air conditioning system is set to provide fresh air entirely through the fresh air valve 6, the total opening degree of each return air valve 7 is 0%, and the total opening degree of each fresh air valve 6 is 100%. This allows the air-side economizer to freely switch between providing fresh air and return air.

[0074] Please refer to the following: Figure 1-4 Based on the above-described solution in this embodiment, the working principle of the air-side economizer provided by this utility model is as follows:

[0075] When the air conditioning system is set to a small total opening of each fresh air valve 6 (e.g., less than 25%), resulting in a small amount of fresh air entering the return air chamber 3 of the air-side economizer through each fresh air valve 6, less air enters the indoor unit on the indoor side A, resulting in a smaller increase in air pressure on the indoor side A and the return air chamber 3 connected to the indoor side A through the return air valve 7.

[0076] At this time, because the first return air duct 4 is relatively short, the pressure drop / negative pressure generated by the indoor return air after flowing through the first return air duct 4 (i.e., indoor cavity pressure minus the pressure at the first return air inlet 131) is small. Therefore, the pressure difference between the two ends of the first return air duct 4 connecting the indoor side A of the outdoor unit (target unit 20) and the first return air inlet 131 (i.e., indoor cavity pressure minus the pressure at the first return air inlet 131) is small. Thus, under the combined effect of the total opening of each fresh air valve 6 and the length of the first return air duct 4, the pressure at the first return air duct 4 connecting the first return air inlet 131 is easily kept greater than atmospheric pressure. This results in a pressure surplus higher than the outer atmospheric environment being formed inside the first pressure relief port 151 of the first return air inlet 131 at the junction of the economizer housing 1 and the outdoor side B. Consequently, each first pressure relief valve 8 automatically opens under the action of the pressure surplus, so as to discharge the excess air in the return air cavity 3 to the outdoor side B atmospheric environment through each first pressure relief valve 8, thereby achieving first-level pressure relief.

[0077] Meanwhile, due to the relatively long length of the second return air duct 5, the pressure drop / negative pressure generated after the indoor return air flows through the second return air duct 5 (i.e., the indoor cavity pressure minus the pressure at the second return air inlet 132) is relatively large. Therefore, the pressure difference between the two ends of the second return air duct 5 connecting the indoor side A of the outdoor unit (target unit 20) and the second return air inlet 132 (i.e., the indoor cavity pressure minus the pressure at the second return air inlet 132) is relatively large. As a result, under the combined effect of the total opening of each fresh air valve 6 and the length of the second return air duct 5, it is difficult to maintain the pressure at the second return air duct 5 connecting the second return air inlet 132 at a level greater than or equal to atmospheric pressure (i.e., usually less than atmospheric pressure). This results in a pressure inverse at the junction of the economizer housing 1 and the outdoor side B, matching the inner side of the second pressure relief port 152 of the second return air inlet 132, which is lower than the outer atmospheric environment. Consequently, each second pressure relief valve 9 remains closed under the action of the pressure inverse, the secondary pressure relief does not open, and only the primary pressure relief is opened.

[0078] When the air conditioning system is set to a large sum of openings of each fresh air valve 6 (e.g., less than 75%), resulting in a large volume of fresh air entering the return air chamber 3 of the air-side economizer through each fresh air valve 6, more air enters the indoor unit on the indoor side A, causing a significant increase in air pressure on the indoor side A and the return air chamber 3 connected to the indoor side A via the return air valve 7.

[0079] At this time, the air-side economizer still operates at the first level of pressure relief as described above. However, due to the large volume of fresh air and the limited area of ​​the first pressure relief port 151, the amount of pressure relief air discharged to the outdoor atmospheric environment B through the first pressure relief port 151 when each of the first pressure relief valves 8 is fully open is limited. This is insufficient to completely release the excess air entering the indoor A, resulting in a continuous increase in air volume and pressure in the indoor A. This pressure rises until, under the combined effect of the total opening of each fresh air valve 6 and the length of the second return air duct 5, the pressure at the second return air duct 5 connected to the second return air port 132 is increased to be greater than or equal to atmospheric pressure. This causes a pressure difference higher than that of the outer atmospheric environment to be formed inside the first pressure relief port 151 of the first return air port 131 at the junction of the economizer housing 1 and the outdoor B. Consequently, each of the second pressure relief valves 9 automatically opens under the action of the pressure difference, so that the excess air in the return air cavity 3 is discharged to the outdoor atmospheric environment B through each of the first pressure relief valves 8 and each of the second pressure relief valves 9, thus achieving the second level of pressure relief. At this time, the air-side economizer has sufficient depressurization capacity, and the extra air entering the indoor side A is completely released, preventing the air pressure on the indoor side A from continuing to rise.

[0080] In summary, the air-side economizer provided by the utility model, by setting up two-stage pressure relief valves, can still smoothly discharge excess air from the return air chamber 3 even when the return air duct is long and the fresh air valve 6 is open at a large degree. This improves the ease of use, versatility, and adaptability of the air-side economizer, can adapt to different operating conditions of the air-side economizer, and can reduce the energy consumption and cost of configuring the air-side economizer on the rooftop unit, which is in line with the development trend of energy conservation and environmental protection.

[0081] Please refer to the following: Figure 1-4 In this embodiment, the first return air duct 4 includes:

[0082] The first duct body 41 has a first air inlet 42 and a first air outlet 43 at its two ends in the extension direction. The first air inlet 42 of the first duct body 41 extends into the indoor cavity of the indoor side A of the target unit 20, so that the first air inlet 42 is connected to the indoor cavity.

[0083] The first air duct body 41 is provided with a first air outlet 43. The other end extends to the intersection of the air-side economizer and the indoor side A of the target unit 20, so that the first air outlet 43 is connected to the first return air outlet 131 of the air-side economizer.

[0084] The second return air duct 5 includes:

[0085] The second air duct body 51 has a second air inlet 52 and a second air outlet 53 at its two ends in the extension direction. The second air duct body 51 with the second air inlet 52 extends into the indoor cavity of the indoor side A of the target unit 20, so that the second air inlet 52 is connected to the indoor cavity.

[0086] The second air duct body 51 is provided with a second air outlet 53. The other end of the second air outlet 53 extends to the intersection of the air-side economizer and the indoor side A of the target unit 20, so that the second air outlet 53 is connected to the second return air outlet 132 of the air-side economizer.

[0087] Please refer to the following: Figure 1-4 In a preferred embodiment, the extension length of the first duct body 41 of the first return air duct 4 in its extension direction is more than twice the extension length of the second duct body 51 of the second return air duct 5 in its extension direction. This allows the second return air duct 5 to be connected to the indoor side A of the outdoor unit (target unit 20) through the shortest extension distance, ensuring that a pressure difference higher than the external atmospheric environment is formed inside the first pressure relief port 151. This causes each first pressure relief valve 8 to open automatically under the action of the pressure difference, ensuring that the air-side economizer can achieve first-level pressure relief.

[0088] Please refer to the following: Figure 1-4In a preferred embodiment of this invention, the area of ​​the first return air vent 131 is smaller than the area of ​​the second return air vent 132.

[0089] Please refer to the following: Figure 1-4 As a preferred embodiment of this invention, the ratio of the area of ​​the first return air vent 131 to the area of ​​the second return air vent 132 is less than or equal to 1:2.

[0090] Please refer to the following: Figure 1-4 In this embodiment, the economizer housing 1 includes:

[0091] A pair of side panels 11 arranged opposite each other;

[0092] Top plate 12, connected between the corresponding top ends of a pair of side plates 11;

[0093] The bottom frame 13 connects the corresponding bottom ends of a pair of side panels 11, and the first return air vent 131 and the second return air vent 132 are separately disposed on the bottom frame 13.

[0094] The partition plate 14 is connected between a pair of side plates 11 and divides the internal space of the economizer housing 1 into a fresh air cavity 2 located between the top plate 12 and the partition plate 14 and a return air cavity 3 located between the bottom frame 13 and the partition plate 14. The fresh air cavity 2 and the return air cavity 3 are respectively separated on the upper and lower sides of the partition plate 14.

[0095] The pressure relief frame 15 is connected to the bottom plate, the partition plate 14 and a pair of side plates 11 at the end opposite to the return air cavity 3 and the intersection of the indoor side A, corresponding to the return air cavity 3. The first pressure relief port 151 and the second pressure relief port 152 are respectively disposed on the pressure relief frame 15.

[0096] Please refer to the following: Figure 1-4 In a preferred embodiment of this invention, the bottom frame 13 includes:

[0097] The frame body 133 is plate-shaped and connects the corresponding bottom ends of a pair of side plates 11;

[0098] The hollowed-out area 134 is located in the middle of the main frame 133;

[0099] The air vent strip 135 is connected between the two sides of the corresponding hollow area 134 of the frame body 133, and divides the hollow area 134 into the first return air vent 131 and the second return air vent 132. That is, the frame body 133 is used as an air vent adapter plate to separate and form the first return air vent 131 and the second return air vent 132.

[0100] Please refer to the following: Figure 3-4 As a preferred embodiment of this invention, the first return air duct 4 further includes:

[0101] The first air outlet edge strip 431 is installed around the other end of the first air duct body 41 where the first air outlet 43 is located, corresponding to the edge of the first air outlet 43.

[0102] The second return air duct 5 also includes:

[0103] The second air outlet edge strip 531 is installed around the other end of the second air duct body 51 where the second air outlet 53 is located, corresponding to the edge of the second air outlet 53.

[0104] When the first return air duct 4 and the second return air duct 5 are assembled with the economizer housing 1, the first air outlet edge strip 431 abuts against the edge of the first return air outlet 131 formed by the air outlet partition strip 135 and the frame body 133, and the second air outlet edge strip 531 abuts against the edge of the second return air outlet 132 formed by the air outlet partition strip 135 and the frame body 133.

[0105] Please refer to the following: Figure 1-4 In this embodiment, the first pressure relief valve 8 includes:

[0106] The first pressure relief blade 81 is rotatably connected to the pressure relief frame 15 at the first pressure relief port 151.

[0107] The first pressure relief drive device (not shown in the figure) is used to drive the first pressure relief blade 81 to rotate to adjust its opening relative to the first pressure relief port 151.

[0108] The second pressure relief valve 9 includes:

[0109] The second pressure relief blade 91 is rotatably connected to the pressure relief frame 15 at the matching second pressure relief port 152;

[0110] The second pressure relief drive device (not shown in the figure) is used to drive the second pressure relief blade 91 to rotate to adjust its opening relative to the second pressure relief port 152.

[0111] In this embodiment, the relative positions of the first return air inlet 131, the second return air inlet 132, the first return air duct 4, and the second return air duct 5 can be interchanged and adjusted.

[0112] Please refer to the following: Figure 1-4 In this embodiment, the first return air inlet 131, the second return air inlet 132, the first air outlet 43, and the second air outlet 53 are all rectangular.

[0113] In other embodiments, the first return air vent 131, the second return air vent 132, the first air outlet 43, and the second air outlet 53 may also be circular, elliptical, trapezoidal, triangular, polygonal, or other geometric shapes.

[0114] Please refer to the following: Figure 1-4 In this embodiment, the fresh air valve 6 includes:

[0115] Fresh air blade 61 is rotatably connected between a pair of side plates 11 and located at the junction of fresh air cavity 2 and indoor side A;

[0116] Fresh air adjustment drive device 62 is used to drive the fresh air blades 61 to rotate to adjust their opening relative to the indoor side A.

[0117] Return air damper 7 includes:

[0118] The return air blade 71 is rotatably connected between a pair of side plates 11 and is located at the junction of the return air cavity 3 and the indoor side A;

[0119] The return air adjustment drive device 72 is used to drive the return air blades 71 to rotate to adjust their opening relative to the indoor side A.

[0120] Please refer to the following: Figure 1-4 In a preferred embodiment of this invention, the first pressure relief blade 81, the second pressure relief blade 91, the fresh air blade 61, and the return air blade 71 are all fixedly mounted on the rotating shaft 10, which is rotatably connected between the corresponding structures. The first pressure relief drive device, the second pressure relief drive device, the fresh air adjustment drive device 62, and the return air adjustment drive device 72 are all motor drive devices installed in the corresponding chambers. The motor drive device drives the corresponding blades to rotate with the rotating shaft 10 through the drive gear installed on its output shaft and the driven gear provided on the rotating shaft 10, so as to realize the opening degree adjustment of the corresponding air valve.

[0121] Please refer to the following: Figure 1-4 As a preferred embodiment of this invention, the first depressurization blade 81, the second depressurization blade 91, the fresh air blade 61, and the return air blade 71 all adopt a multi-blade unit blade structure with an even number of blade units.

[0122] In other embodiments, the first depressurization blade 81, the second depressurization blade 91, the fresh air blade 61, and the return air blade 71 may also adopt a multi-blade unit blade structure or a single-blade structure with an odd number of blade units.

[0123] Please refer to the following: Figure 1-4 As a preferred embodiment of this example, at least two fresh air valves 6 are provided, and each fresh air valve 6 is arranged sequentially at intervals along the height direction at the intersection of the fresh air chamber 2 and the indoor side A of the target unit 20.

[0124] At least two return air valves 7 are provided, and each return air valve 7 is arranged at intervals along the height direction at the intersection of the return air chamber 3 and the indoor side A of the target unit 20.

[0125] At least two first pressure relief valves 8 are provided, and each first pressure relief valve 8 is arranged at intervals along the height direction at the first pressure relief port 151.

[0126] At least two second pressure relief valves 9 are provided, and each second pressure relief valve 9 is arranged at intervals along the height direction at the second pressure relief port 152.

[0127] Please refer to the following: Figure 1-4 As a preferred embodiment of this invention, each of the following is provided: fresh air valve 6, return air valve 7, first pressure relief valve 8, and first pressure relief valve 8 are provided in threes.

[0128] In other embodiments, the fresh air valve 6, the return air valve 7, the first pressure relief valve 8 and the first pressure relief valve 8 can also adopt the reciprocating linear motion of the telescopic baffle driven by the linear drive mechanism, thereby changing the size of the corresponding air vent blocked by the baffle, thereby adjusting the opening size of the corresponding air valve.

[0129] Please refer to the following: Figure 1-4 In this embodiment, a pair of side plates 11 are arranged in parallel, the top plate 12 and the bottom frame 13 are arranged in parallel, and the bottom frame 13 is perpendicularly connected to the side plates 11.

[0130] Please refer to the following: Figure 1-4 In a preferred embodiment of this invention, the top plate 12 and the bottom frame 13 are both horizontally arranged, the pair of side plates 11 are both vertically arranged, the first return air inlet 131 and the second return air inlet 132 are both horizontally arranged, and the first duct body 41 of the first return air duct 4 and the second duct body 51 of the second return air duct 5 both extend in the vertical direction.

[0131] Please refer to the following: Figure 1-4 In one embodiment of this invention, the area of ​​the top plate 12 is smaller than that of the bottom frame 13, and the cross-section of the economizer housing 1 parallel to the side plate 11 is trapezoidal.

[0132] Please refer to the following: Figure 3-4 This utility model also provides an air conditioning unit, including the above-mentioned air-side economizer, wherein the target unit 20 is the outdoor unit of the air conditioning unit.

[0133] Please refer to the following: Figure 3-4 In this embodiment, the outdoor unit (target unit 20) is a rooftop unit.

[0134] Please refer to the following: Figure 3-4 In a preferred embodiment of this invention, the rooftop unit includes:

[0135] Unit casing 201;

[0136] The air supply duct 202 is located at the intersection of the lower layer inside the unit casing 201 and the indoor side A of the roof unit (target unit 20), and is connected to the indoor unit of the air conditioning system through the air supply duct (not shown in the figure).

[0137] An air-side economizer is installed inside the lower layer of the unit housing 201 at the junction with the outdoor side B and is adjacent to the air supply duct 202. The unit housing 201 includes an economizer enclosure 2011 that matches the air-side economizer. The economizer enclosure 2011 has a clearance opening that connects the fresh air cavity 2 of the air-side economizer and the first pressure relief port 151 and the second pressure relief port 152 to allow airflow to pass through.

[0138] The unit housing 201 also includes a housing base plate 2012 located at the bottom of the air supply duct 202. The housing base plate 2012 is provided with a first clearance opening 2013 and a second clearance opening 2014 respectively matching the first return air inlet 131 and the second return air inlet 132, so that one end of the first return air duct 4 with the first air outlet 43 and the other end of the second return air duct 5 with the second air outlet 53 can pass through and extend into the air supply duct 202.

[0139] When the first return air duct 4 and the second return air duct 5 are assembled with the economizer housing 1, the opposite sides of the first air outlet edge strip 431 simultaneously abut against the edge of the first clearance port 2013, and the air outlet partition strip 135 and the frame body 133 enclose the edge of the first return air port 131. The opposite sides of the second air outlet edge strip 531 simultaneously abut against the edge of the second clearance port 2014, and the air outlet partition strip 135 and the frame body 133 enclose the edge of the second return air port 132.

[0140] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Those skilled in the art should understand that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An air-side economizer, comprising an economizer housing (1), and a fresh air chamber (2) and a return air chamber (3) separated and disposed inside the economizer housing (1), characterized in that, Also includes: The first return air inlet (131) and the second return air inlet (132) are spaced apart on the economizer housing (1) and are respectively connected to the return air cavity (3); The first return air duct (4) and the second return air duct (5) are respectively connected to the indoor side (A) of the target unit (20) and the first return air outlet (131) and the second return air outlet (132), and the length of the first return air duct (4) is less than that of the second return air duct (5). Several fresh air valves (6) are located at the junction of the fresh air chamber (2) and the indoor side (A) to control the amount of fresh air entering the indoor side (A) from the outdoor side (B) of the target unit (20) and the fresh air chamber (2); Several return air valves (7) are located at the junction of the return air cavity (3) and the indoor side (A) to control the return air volume entering the indoor side (A) through the return air cavity (3); The first pressure relief port (151) and the second pressure relief port (152) are spaced apart at the junction of the economizer housing (1) and the outdoor side (B), and are respectively matched with the first return air port (131) and the second return air port (132). A plurality of first pressure relief valves (8) and a plurality of second pressure relief valves (9) are respectively provided at the first pressure relief port (151) and the second pressure relief port (152).

2. The air-side economizer as described in claim 1, characterized in that, The area of ​​the first return air vent (131) is smaller than that of the second return air vent (132).

3. The air-side economizer as described in claim 1 or 2, characterized in that, The economizer housing (1) includes: A pair of side panels (11) arranged opposite to each other; A top plate (12) is connected between the corresponding top ends of a pair of side plates (11); The bottom frame (13) connects the corresponding bottom ends of a pair of side panels (11), and the first return air vent (131) and the second return air vent (132) are separately disposed on the bottom frame (13); A partition plate (14) is connected between a pair of side plates (11) and divides the internal space of the economizer housing (1) into the fresh air cavity (2) located between the top plate (12) and the partition plate (14) and the return air cavity (3) located between the bottom frame (13) and the partition plate (14); A pressure relief frame (15) is connected to the bottom plate, the partition plate (14) and a pair of side plates (11) at one end of the return air cavity (3) opposite to the intersection of the indoor side (A) and the return air cavity (3). The first pressure relief port (151) and the second pressure relief port (152) are separately arranged on the pressure relief frame (15).

4. The air-side economizer as described in claim 3, characterized in that, The first pressure relief valve (8) includes: The first pressure relief blade (81) is rotatably connected to the pressure relief frame (15) at the location where it matches the first pressure relief port (151); The first pressure relief drive device is used to drive the first pressure relief blade (81) to rotate to adjust its opening relative to the first pressure relief port (151); The second pressure relief valve (9) includes: The second pressure relief blade (91) is rotatably connected to the pressure relief frame (15) at the location where it matches the second pressure relief port (152); The second pressure relief drive device is used to drive the second pressure relief blade (91) to rotate to adjust its opening relative to the second pressure relief port (152).

5. The air-side economizer as described in claim 3, characterized in that, The fresh air valve (6) includes: Fresh air blades (61) are rotatably connected between a pair of side plates (11) and located at the junction of the fresh air cavity (2) and the indoor side (A); Fresh air adjustment drive device (62) is used to drive the fresh air blades (61) to rotate to adjust their opening relative to the indoor side (A); The return air valve (7) includes: The return air blade (71) is rotatably connected between a pair of side plates (11) and is located at the junction of the return air cavity (3) and the indoor side (A); A return air adjustment drive (72) is used to drive the return air blades (71) to rotate to adjust their opening relative to the indoor side (A).

6. The air-side economizer as described in claim 3, characterized in that, The pair of side panels (11) are arranged in parallel, the top panel (12) and the bottom frame (13) are arranged in parallel, and the bottom frame (13) is perpendicularly connected to the side panels (11).

7. The air-side economizer as described in claim 6, characterized in that, The area of ​​the top plate (12) is smaller than that of the bottom frame (13), and the cross-section of the economizer housing (1) parallel to the side plate (11) is trapezoidal.

8. An air conditioning system, characterized in that, Includes the air-side economizer as described in any one of claims 1-7, wherein the target unit (20) is the outdoor unit of the air conditioning system.

9. The air conditioning system as described in claim 8, characterized in that, The outdoor unit is a rooftop unit.

10. The air conditioning system as described in claim 9, characterized in that, The rooftop unit includes: Unit casing (201); An air supply duct (202) is located at the junction of the lower inner layer of the unit casing (201) and the indoor side (A); The air-side economizer is installed inside the lower layer of the unit casing (201) at the intersection with the outdoor side (B) and is adjacent to the air supply duct (202).

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