A closed-loop air conditioning return air system

Abstract

This invention relates to the field of air conditioning system technology, specifically to a closed-loop air conditioning return air system, comprising a first filter installed inside the air conditioning duct, an air duct extending through the bottom of the air conditioning duct, an adjustment unit installed inside the air duct, and a surface cooler, a heater, a blower, and a second filter installed inside the air conditioning duct. This invention adjusts the size of the openings on both sides of the air inlet using the adjustment unit, allowing different proportions of indoor air to enter the primary and secondary mixing chambers. This not only prevents the problem of insignificant temperature rise / fall effects caused by the cancellation of heat and cold in the primary return air, but also prevents the problem of low resource utilization and waste in the secondary return air. Simultaneously, by adjusting the size of the openings on both sides of the air inlet using the adjustment unit, and by driving the opening and closing of the wind-blocking louvers and the left-right movement of the sliding plate, rapid temperature rise / fall is achieved when the temperature difference from the threshold temperature is too large.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and more specifically, to a closed-loop air conditioning return air system. Background Technology

[0002] A closed-loop air conditioner is an air conditioning system designed specifically for enclosed or semi-enclosed spaces. Its core features are high sealing and precise environmental control capabilities. Through technologies such as closed-loop circulation, pressure balancing, and high-efficiency filtration, it solves the problems that traditional air conditioners cannot meet in terms of temperature and humidity stability, cleanliness, and energy efficiency. It is widely used in industrial, commercial, and special scenarios.

[0003] Chinese patent application CN115773555A discloses an air conditioning return air system. In this system, the heat load in a first cleanroom is higher than that in a second cleanroom. The first cleanroom is located on a first air circulation loop, and the second cleanroom is located on a second air circulation loop. A first fresh air handling unit is used to supply fresh air to the first air circulation loop, and a second fresh air handling unit is used to supply fresh air to the second air circulation loop. A return air assembly connects the first and second air circulation loops and is used to transfer air from the first air circulation loop to the second air circulation loop. The fresh air volume of the first fresh air handling unit increases, and the temperature of the increased fresh air is lower than the indoor air temperature of the first cleanroom. This increased air volume entering the first air circulation loop reduces the heat load in the first cleanroom. This reduces or eliminates the cooling and heating offsetting phenomenon, achieving the goal of energy saving and emission reduction.

[0004] Although the aforementioned patents utilize air circulation loops and cleanroom components to reduce the phenomenon of heat and cold offsetting, achieving the goal of energy conservation and emission reduction, considering that in specific environments, such as industrial cleanrooms and hospital operating rooms, where temperature control is more stringent, the traditional use of primary and secondary return air alone results in the problem of heat and cold offsetting in the primary return air. While using secondary return air can reduce the problem of heat and cold offsetting, the mixing of fresh air and indoor air will lead to frequent cooling or heating operations, resulting in resource waste.

[0005] In view of this, we propose a closed-loop air conditioning return air system. Summary of the Invention

[0006] The purpose of this invention is to provide a closed-loop air conditioning return air system to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides a closed-loop air conditioning return air system, including air conditioning ducts and an adjustment unit.

[0008] A return air unit, which is used to regulate the temperature of the mixture of indoor air and fresh air;

[0009] An adjustment unit is used to control the proportion of indoor air entering the air conditioning duct and to control the mixing position of indoor air and outdoor fresh air.

[0010] A mixing unit is used to control the mixing of indoor air and outdoor fresh air at different temperatures to control temperature and humidity.

[0011] The air conditioning duct is equipped with a first filter, and an air duct runs through its bottom. The adjustment unit is located within the air duct. The air conditioning duct also contains a surface cooler, a heater, a blower, and a second filter.

[0012] The surface cooler and heater are positioned above the adjustment unit.

[0013] As a preferred embodiment of the present invention, the air conditioning duct is provided with three parts: a fresh air chamber, a surface cooling section, and a heating section. The position of the fresh air chamber corresponds to the position of the first filter, the position of the surface cooling section corresponds to the position of the surface cooler, and the position of the heating section corresponds to the position of the heater.

[0014] As a preferred embodiment of the present invention, the air conditioning duct is further provided with a primary mixing chamber and a secondary mixing chamber, the positions of which are located on both sides of the adjustment unit, and the positions of the primary mixing chamber and the secondary mixing chamber correspond to the positions of the surface cooling section and the heating section, respectively.

[0015] As a preferred embodiment of the present invention, a slide rail is installed on the inner wall of the air duct, an air inlet is opened at the bottom of the air duct, side plates are fixedly connected to the top of both sides of the air duct, a sliding plate is slidably connected between the two side plates, wind-blocking louvers are fixedly connected to both sides of the bottom of the sliding plate, and touch sensors are fixedly connected to the inner side of the wind-blocking louvers on both sides.

[0016] As a preferred embodiment of the present invention, the bottom of the sliding plate is fixedly connected to a horizontal column by a fixing post, and a fixing plate is fixedly connected to one side of the bottom of the horizontal column. A square groove is opened at the bottom of the fixing plate, and the horizontal column and the touch sensor are on the same horizontal line.

[0017] As a preferred embodiment of the present invention, the adjustment unit includes a wind baffle plate, which is slidably connected to a slide rail. A circular groove is provided at the center of the wind baffle plate, and a disc motor is fixedly connected to the bottom inner wall of the circular groove.

[0018] As a preferred embodiment of the present invention, the output end of the disc motor is fixedly connected to a rotating rod, and a first turntable is fixedly connected to the end of the rotating rod away from the disc motor. The rotating rod is fixedly connected to the periphery of the first turntable. A fixed plate is fixedly connected to the inner wall of the circular groove. A second turntable is rotatably connected to the top of the fixed plate, and a sliding strip is slidably connected to the top of the second turntable.

[0019] As a preferred embodiment of the present invention, both ends of the top of the sliding bar are fixedly connected to protruding columns, and both ends of the sliding bar are fixedly connected to extension rods. The extension rods are on the same horizontal plane as the inner wall of the circular groove, and a sliding column is fixedly connected to the top of one of the protruding columns, and the sliding column is slidably connected in the square groove.

[0020] As a preferred embodiment of the present invention, the surface of the sliding bar is provided with a square hole, the rotating rod passes through the square hole, and the two protruding pillars are respectively located on both sides of the first turntable, and the outer wall of the protruding pillar is in contact with the outer wall of the first turntable.

[0021] As a preferred embodiment of the present invention, in the mixing unit, indoor air at different temperatures is adjusted in proportion by the adjustment unit and then enters the primary mixing chamber and the secondary mixing chamber for mixing, temperature control, and humidity control.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. In this closed-loop air conditioning return air system, by adjusting the size of the openings on both sides of the air inlet by the adjustment unit, different proportions of indoor air enter the primary mixing chamber and the secondary mixing chamber. This not only prevents the problem of insignificant temperature rise and fall caused by the cancellation of heat and cold in the primary return air, but also prevents the problem of low resource utilization and waste in the secondary return air.

[0024] 2. In this closed-loop air conditioning return air system, the size of the openings on both sides of the air inlet is adjusted by the adjustment unit, which drives the opening and closing of the wind-blocking louvers and the left and right movement of the sliding plate, thus realizing rapid temperature rise and fall when the temperature difference between the temperature and the threshold temperature is too large. Attached Figure Description

[0025] Figure 1 This is a schematic cross-sectional view of the closed-loop air conditioning return air system of the present invention;

[0026] Figure 2 This is a schematic cross-sectional view of the air duct of the closed-type air conditioning return air system of the present invention;

[0027] Figure 3 This is a three-dimensional schematic diagram of the unfolded air duct of the closed-type air conditioning return air system of the present invention.

[0028] Figure 4 This is a three-dimensional schematic diagram of the internal air duct of the closed-type air conditioning return air system of the present invention;

[0029] Figure 5 This is a three-dimensional schematic diagram of the adjustment unit of the closed-type air conditioning return air system of the present invention;

[0030] Figure 6 This is a schematic diagram of the return air unit of the closed-loop air conditioning return air system of the present invention;

[0031] Figure 7 This is a schematic diagram of the adjustment unit of the closed-loop air conditioning return air system of the present invention;

[0032] The meanings of the labels in the diagram are as follows:

[0033] 1. Air conditioning ducts; 11. Filter No. 1; 12. Cooler; 13. Heater; 14. Blower; 15. Filter No. 2; 2. Fresh air chamber; 21. Cooler section; 22. Heating section; 23. Primary mixing chamber; 24. Secondary mixing chamber;

[0034] 3. Air duct; 31. Slide rail; 311. Air inlet; 32. Side panel; 33. Sliding plate; 331. Windproof louver; 332. Touch sensor; 34. Horizontal column; 341. Fixing plate; 3411. Square groove;

[0035] 4. Adjustment unit; 41. Wind baffle; 42. Disc motor; 421. Rotating rod; 422. Turntable No. 1; 43. Fixed disc; 431. Turntable No. 2; 44. Sliding bar; 441. Protruding column; 442. Extension rod; 443. Sliding column. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0038] Example 1: Please refer to Figures 1-7As shown, this embodiment provides a closed-loop air conditioning return air system, including an air conditioning duct 1 and an adjustment unit 4.

[0039] The return air unit is used to regulate the temperature of the indoor air mixed with the fresh air.

[0040] Adjustment unit 4 is used to control the proportion of indoor air entering the air conditioning duct 1, and to control the mixing position of indoor air and outdoor fresh air.

[0041] The mixing unit is used to control the mixing of indoor air and outdoor fresh air at different temperatures to control temperature and humidity.

[0042] The air conditioning duct 1 is equipped with a first filter 11. The bottom of the air conditioning duct 1 is provided with an air duct 3. The adjustment unit 4 is located in the air duct 3. The air conditioning duct 1 is also equipped with a surface cooler 12, a heater 13, a blower 14 and a second filter 15. The surface cooler 12 and the heater 13 are located above the adjustment unit 4.

[0043] like Figure 1 As shown, the air conditioning duct 1 contains three parts: a fresh air chamber 2, a surface cooling section 21, and a heating section 22. The position of the fresh air chamber 2 corresponds to the position of the first filter 11, the position of the surface cooling section 21 corresponds to the position of the surface cooler 12, and the position of the heating section 22 corresponds to the position of the heater 13. The air conditioning duct 1 also contains a primary mixing chamber 23 and a secondary mixing chamber 24. The primary mixing chamber 23 and the secondary mixing chamber 24 are located on both sides of the adjustment unit 4, and their positions correspond to the positions of the surface cooling section 21 and the heating section 22, respectively.

[0044] like Figures 2-3 As shown, a slide rail 31 is installed on the inner wall of the air duct 3, an air inlet 311 is opened at the bottom of the air duct 3, side plates 32 are fixedly connected to the top of both sides of the air duct 3, a sliding plate 33 is slidably connected between the two side plates 32, wind-blocking louvers 331 are fixedly connected to both sides of the bottom of the sliding plate 33, a touch sensor 332 is fixedly connected to the inner side of both sides of the wind-blocking louvers 331, a horizontal column 34 is fixedly connected to the bottom of the sliding plate 33 through a fixed column, a fixed plate 341 is fixedly connected to the bottom of one side of the horizontal column 34, a square groove 3411 is opened at the bottom of the fixed plate 341, and the horizontal column 34 and the touch sensor 332 are on the same horizontal line.

[0045] like Figure 5As shown, the adjustment unit 4 includes a baffle plate 41, which is slidably connected to the slide rail 31. A circular groove is formed at the center of the baffle plate 41. A disc motor 42 is fixedly connected to the bottom inner wall of the circular groove. A rotating rod 421 is fixedly connected to the output end of the disc motor 42. A first turntable 422 is fixedly connected to the end of the rotating rod 421 away from the disc motor 42. The rotating rod 421 is fixedly connected to the periphery of the first turntable 422. A fixed plate 43 is fixedly connected to the inner wall of the circular groove. A second turntable 431 is rotatably connected to the top of the fixed plate 43. A sliding strip 44 is slidably connected to the top of the second turntable 431. Both ends of the top of the sliding strip 44 are fixedly connected to protruding columns. 441, both ends of the sliding strip 44 are fixedly connected to extension rods 442. The extension rods 442 are on the same horizontal plane as the inner wall of the circular groove. The top of the protruding column 441 on one side is fixedly connected to a sliding column 443. The sliding column 443 is slidably connected in the square groove 3411. A square hole is opened on the surface of the sliding strip 44. The rotating rod 421 passes through the square hole. The two protruding columns 441 on both sides are located on both sides of the first turntable 422, and the outer wall of the protruding column 441 is in contact with the outer wall of the first turntable 422. In the mixing unit, the indoor air of different temperatures is adjusted in proportion by the adjustment unit 4 and enters the primary mixing chamber 23 and the secondary mixing chamber 24 respectively for mixing, temperature control and humidity control.

[0046] The inner wall of the second turntable 431 is provided with a ratchet groove, and a latching block is telescopically connected to the outer wall of the rotating rod 421. The size of the latching block matches the ratchet groove. When the rotating rod 421 rotates in one direction, the latching block will drive the ratchet groove and the second turntable 431 to rotate. When the rotating rod 421 rotates in another direction, the latching block will not drive the second turntable 431 to rotate.

[0047] Therefore, it can be seen that in a closed space, indoor air cannot circulate to the outside on its own, so an air conditioning return air system is needed for ventilation, such as... Figures 1-2 As shown, at this time, after the outdoor fresh air enters the fresh air cavity 2 in the air conditioning duct 1, it enters the surface cooling section 21 after the first filtration by the No. 1 filter 11 and is cooled and dehumidified by the surface cooler 12. Then it continues to the heating section 22, where the heater 13 is used to adjust the temperature to a suitable level, and is delivered into the room by the blower 14. At this time, when ventilation is required, the indoor air will enter the adjustment unit 4 from the air inlet 311. At this time, the temperature sensor senses whether the indoor temperature is within the set threshold. After determining the indoor temperature, the adjustment unit 4 is used to control the temperature of the indoor air entering the air conditioning duct 1.

[0048] Meanwhile, in adjustment unit 4, when the temperature is detected to be outside the threshold range, the rotating rod 421, driven by the disc motor 42, will drive the first turntable 422 to rotate. Since the rotating rod 421 is not in the center of the first turntable 422, when the rotating rod 421 drives the first turntable 422 to rotate, the first turntable 422 will cause the protruding pillars 441 on both sides to move left and right together. When the temperature exceeds the threshold range, it indicates that the temperature is too high. At this time, the rotation of the first turntable 422 will cause the sliding bar 44 to move to the right, and simultaneously drive the extension rod 442 to push... The wind baffle 41 moves a small distance to the right, making the air inlet 311 on the left side of the wind baffle 41 larger, while the air inlet 311 on the right side of the wind baffle 41 becomes smaller. At this time, most of the indoor air entering from the air inlet 311 will flow into the primary mixing chamber 23, and the rest will flow into the secondary mixing chamber 24. The indoor air entering the primary mixing chamber 23 is mixed with the outdoor fresh air for the first time, and is cooled by the surface cooler 12 in the surface cooling section 21. Then the mixed air continues to flow towards the heating section 22, and is heated and temperature controlled by the heater 13 before being blown into the room again.

[0049] In addition, some of the indoor air flowing into the secondary mixing chamber 24 will be mixed with the mixed air in the primary mixing chamber 23 and finally flow into the room. Conversely, when the temperature is below the threshold range, it indicates that the temperature is too low. The adjustment unit 4 will adjust the opening ratio between the primary mixing chamber 23 and the secondary mixing chamber 24. At this time, the opening in the primary mixing chamber 23 becomes smaller, while the opening in the secondary mixing chamber 24 becomes larger. The air volume mixed with the fresh air for the first time becomes smaller, and the air volume affected by the cooling becomes smaller. Therefore, during the secondary mixing, the influence of the low temperature air will be smaller. The same applies to the opposite. This means that by adjusting the opening size of the air inlets 311 on both sides of the baffle plate 41, not only can the problem of insignificant heating and cooling effect caused by the cancellation of the cold and heat of the primary return air be prevented, but also the problem of low resource utilization and waste in the secondary return air can be prevented.

[0050] It should be noted that, as Figure 5As shown, when the second turntable 431 is rotated by the rotating rod 421 to a state parallel to the horizontal column 34, when the first turntable 422 drives the sliding bar 44 to move left and right again, it will drive the horizontal column 34 to move left and right together through the protruding column 441. At this time, the horizontal column 34 will gradually contact the touch sensor 332 as it moves left and right. The contact sensor 332 will send a signal to open part of the wind-blocking louver 331 on the side away from the contact sensor 332. At this time, the proportion of indoor airflow on the side where the wind-blocking louver 331 is open will increase. At the same time, the left and right movement of the horizontal column 34 will also drive the sliding plate 33 to slide away from the direction where the wind-blocking louver 331 is open. Similarly, it is used to adjust the proportion of indoor air entering the primary mixing chamber 23 and the secondary mixing chamber 24. Similarly, the adjustment unit 4 can be used to realize that all indoor air enters the primary mixing chamber 23 or the secondary mixing chamber 24, realizing rapid heating and cooling when the temperature difference between the temperature and the threshold temperature is too large.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A closed-loop air conditioning return air system, comprising an air conditioning duct (1) and an adjustment unit (4), characterized in that: A return air unit, which is used to regulate the temperature of the mixture of indoor air and fresh air; Adjustment unit (4), the adjustment unit (4) is used to control the proportion of indoor air entering the air conditioning duct (1), and to control the mixing position of indoor air and outdoor fresh air; A mixing unit is used to control the mixing of indoor air and outdoor fresh air at different temperatures to control temperature and humidity. Wherein: a first filter (11) is installed inside the air conditioning duct (1), an air duct (3) is installed through the bottom of the air conditioning duct (1), the adjustment unit (4) is installed inside the air duct (3), and a surface cooler (12), a heater (13), a blower (14) and a second filter (15) are also installed inside the air conditioning duct (1). The surface cooler (12) and heater (13) are positioned above the adjustment unit (4); The inner wall of the air duct (3) is equipped with a slide rail (31), and the bottom of the air duct (3) is provided with an air inlet (311). The top of both sides of the air duct (3) is fixedly connected with side plates (32), and a sliding plate (33) is slidably connected between the two side plates (32). Both sides of the bottom of the sliding plate (33) are fixedly connected with wind-blocking louvers (331), and both sides of the wind-blocking louvers (331) are fixedly connected with touch sensors (332). The bottom of the sliding plate (33) is fixedly connected to a horizontal column (34) by a fixed column. A fixed plate (341) is fixedly connected to one side of the bottom of the horizontal column (34). A square groove (3411) is opened at the bottom of the fixed plate (341). The horizontal column (34) and the touch sensor (332) are on the same horizontal line. The adjustment unit (4) includes a wind baffle (41), which is slidably connected to the slide rail (31). A circular groove is provided at the center of the wind baffle (41), and a disc motor (42) is fixedly connected to the bottom inner wall of the circular groove.

2. The closed-loop air conditioning return air system according to claim 1, characterized in that: The air conditioning duct (1) is divided into three parts: fresh air cavity (2), surface cooling section (21) and heating section (22). The position of the fresh air cavity (2) corresponds to the position of the first filter (11), the position of the surface cooling section (21) corresponds to the position of the surface cooler (12), and the position of the heating section (22) corresponds to the position of the heater (13).

3. A closed-loop air conditioning return air system according to claim 2, characterized in that: The air conditioning duct (1) also contains a primary mixing chamber (23) and a secondary mixing chamber (24). The primary mixing chamber (23) and the secondary mixing chamber (24) are located on both sides of the adjustment unit (4), and their positions correspond to the positions of the surface cooling section (21) and the heating section (22), respectively.

4. A closed-loop air conditioning return air system according to claim 3, characterized in that: The output end of the disc motor (42) is fixedly connected to a rotating rod (421). The end of the rotating rod (421) away from the disc motor (42) is fixedly connected to a first turntable (422). The rotating rod (421) is fixedly connected to the periphery of the first turntable (422). A fixed plate (43) is fixedly connected to the inner wall of the circular groove. A second turntable (431) is rotatably connected to the top of the fixed plate (43). A sliding strip (44) is slidably connected to the top of the second turntable (431).

5. A closed-loop air conditioning return air system according to claim 4, characterized in that: Both ends of the top of the sliding bar (44) are fixedly connected to protruding columns (441), and both ends of the sliding bar (44) are fixedly connected to extension rods (442). The extension rods (442) are on the same horizontal plane as the inner wall of the circular groove. The top of one side of the protruding column (441) is fixedly connected to a sliding column (443), and the sliding column (443) is slidably connected in the square groove (3411).

6. A closed-loop air conditioning return air system according to claim 5, characterized in that: The surface of the sliding bar (44) is provided with a square hole, the rotating rod (421) passes through the square hole, and the two protruding columns (441) are located on both sides of the first turntable (422), and the outer wall of the protruding column (441) is in contact with the outer wall of the first turntable (422).

7. A closed-loop air conditioning return air system according to claim 6, characterized in that: In the mixing unit, indoor air at different temperatures is adjusted in the adjustment unit (4) to enter the primary mixing chamber (23) and the secondary mixing chamber (24) for mixing, temperature control and humidity control.

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