Induced fan coil with variable primary air volume

Abstract

The utility model relates to an induction type fan coil with variable primary air volume, belongs to the technical field of air conditioning, and solves the problems that in the prior art, when the primary air volume subjected to centralized treatment is reduced or the primary air subjected to centralized treatment is not cooled or heated, the cooling or heating effect of an induction unit is poor; or when the primary air is closed, the induction unit cannot supply cold or heat. The heat exchanger comprises a box body and a heat exchange coil pipe, an inner cavity of the box body is divided into a fan cavity and an induction cavity, the heat exchange coil pipe is a series-connection double coil pipe or a double-partition coil pipe, when the heat exchange coil pipe is the series-connection double coil pipe, the series-connection double coil pipe comprises a first coil pipe and a second coil pipe, the second coil pipe is located in the induction cavity, and the first coil pipe is located in the induction cavity. When the heat exchange coil pipe is a double-partition coil pipe, the double-partition coil pipe comprises a third heat exchange area and a fourth heat exchange area, and the fourth heat exchange area is located in the induction cavity. The device can normally operate under the condition that the primary air volume is changed or the primary air is closed.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an induction type fan coil unit with variable primary air volume. Background Art

[0002] The inducer is an air conditioning terminal device installed in each room. It is a special air supply device that can induce a certain amount of air in the room to increase the air supply volume and reduce the air supply temperature difference. It is composed of a box, a nozzle, a static pressure box, a primary air interface and or a heat exchange coil. The primary air that has been centrally processed by the air handling unit is first sent by the air handling unit's supply fan into the static pressure box of the inducer installed in the air-conditioned room, and then ejected from the nozzle at a high speed (20-30m / s). Under the action of the jet airflow, a negative pressure is formed in the inducer, thereby inducing the indoor return air to be mixed with the primary air to form the supply air of the air-conditioned room, or the indoor return air is heated or cooled when passing through the heat exchange coil, and then mixed with the primary air to form the supply air of the air-conditioned room. The indoor air conditioning cooling load or heating load of the induction unit without coil is entirely borne by the primary air obtained by the central processing of the air handling unit. The indoor cooling and heating load of the induction unit with coil is partly borne by the primary air obtained by the central processing of the air handling unit, and the other part is borne by the indoor return air heated or cooled by the heat exchange coil. The disadvantages of the existing induction unit are: when the air volume of the centrally processed primary air is reduced, or when the centrally processed primary air is not cooled or heated, the cooling or heating effect of the induction unit is poor; when the primary air is turned off, the induction unit cannot provide cooling or heating. Utility Model Content

[0003] In view of the above analysis, the embodiment of the present invention aims to provide an induction fan coil unit with variable primary air volume to solve at least one of the following problems: 1) when the volume of the centrally processed primary air is reduced, or when the centrally processed primary air is not cooled or heated, the cooling or heating effect of the induction unit is poor; 2) when the primary air is turned off, the induction unit cannot provide cooling or heating.

[0004] The utility model provides an induction fan coil with a variable primary air volume, comprising a box body and a heat exchange coil, wherein the inner cavity of the box body is divided into a fan cavity and an induction cavity, and the heat exchange coil is a series double coil or a double-zone coil. When the heat exchange coil is a series double coil, the series double coil includes a first coil and a second coil, and the second coil is located in the induction cavity. When the heat exchange coil is a double-zone coil, the double-zone coil includes a third heat exchange zone and a fourth heat exchange zone, and the fourth heat exchange zone is located in the induction cavity.

[0005] Furthermore, the series double coil also includes a first connecting pipe, a second connecting pipe and a connecting piece. The first connecting pipe and the second connecting pipe connect the first coil and the second coil to form a fluid channel. One end of the connecting piece is connected to one end of the first coil, and the other end of the connecting piece is connected to one end of the second coil.

[0006] Furthermore, the first coil or the fourth heat exchange zone is located in the fan cavity.

[0007] Furthermore, the first coil includes a first U-shaped coil, first fins and a main return pipe. The first U-shaped coil is formed by a plurality of first heat exchange tubes and first U-shaped tubes connected end to end in sequence. The first heat exchange tubes pass through the first fins arranged in parallel at equal distances to form a first heat exchange zone.

[0008] Furthermore, the second coil includes a second U-shaped coil and second fins. The second U-shaped coil is formed by a plurality of second heat exchange tubes and second U-shaped tubes connected end to end in sequence. The second heat exchange tubes pass through the second fins that are equidistantly arranged in parallel to form a second heat exchange area.

[0009] Furthermore, the series-connected double coils further include a first guard plate and a second guard plate, wherein the first guard plate is arranged at one end of the first coil, and the second guard plate is arranged at one end of the second coil.

[0010] Furthermore, the dual-zone coil includes a third U-shaped coil, a third guard plate, a fourth guard plate and a fifth guard plate. The third U-shaped coil is formed by a plurality of third heat exchange tubes and third U-shaped tubes connected end to end in sequence. The third guard plate is arranged at one end of the third U-shaped coil, the fourth guard plate is arranged in the middle of the third U-shaped coil, and the fifth guard plate is arranged at the other end of the third U-shaped coil.

[0011] Furthermore, the dual-partition coil also includes a third fin, and the third heat exchange tube between the third guard plate and the fourth guard plate passes through the third fins arranged in parallel at equal distances to form the third heat exchange zone, and the third heat exchange tube between the fourth guard plate and the fifth guard plate passes through the third fins arranged in parallel at equal distances to form the fourth heat exchange zone.

[0012] Furthermore, it also includes a fan, a primary air nozzle, a return air nozzle, an air duct unit and a condensate tray arranged in the box.

[0013] Furthermore, a convection heat dissipation cavity is provided in the box body.

[0014] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0015] 1) The inner cavity of the box of the utility model is divided into a fan cavity and an induction cavity. A second coil or a fourth heat exchange zone is provided in the induction cavity, so that the induced wind can undergo heat exchange through the heat exchange device, ensuring that the delivered air has a cooling or heating effect.

[0016] 2) The utility model is provided with two groups of nozzles, namely primary air nozzles and return air nozzles. The air entering the primary air nozzles is primary air, and the air entering the return air nozzles is return air pressurized by a fan and cooled or heated by a heat exchange coil. The primary air ejected at high speed by the primary air nozzles and the return air ejected at high speed by the return air nozzles can generate induced wind separately or simultaneously, so that the air supply of the utility model includes a mixed wind of primary air and induced wind, a mixed wind of return air and induced wind, and a mixed wind of primary air, return air and induced wind. It can realize various working modes such as variable primary air volume for cooling or heating, cooling or heating without primary air, and fresh air. At the same time, it can meet the cooling or heating effect when the primary air volume changes, the primary air is not cooled or heated, or there is no primary air.

[0017] 3) When the heat exchange coil of the present invention adopts a double coil in series, or when there is no heat exchange device in the fan cavity, since the supply air is a mixture of primary air, return air and induced air, the supply air temperature can be controlled above the dew point temperature of the room by adjusting the air volume of the return air (equivalent to adjusting the air volume of the supply fan), ensuring that the supply air does not condense. Therefore, low-temperature, large temperature difference chilled water can be used for cooling, which can be matched with low-temperature chilled water systems such as ice, ice crystals, and cold storage systems, and greatly reduce the energy consumption of the distribution system.

[0018] 4) The vertical unit of the present invention can adopt natural convection and radiation to provide heat with or without a heat dissipation cavity, thereby realizing the function of radiator heating and can be used as a radiator.

[0019] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages will become apparent from the description or be understood through practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference symbols denote the same components.

[0021] Figure 1 Schematic diagram of the structure of a vertical variable primary air volume induction fan coil unit according to specific embodiment 1;

[0022] Figure 2Schematic diagram of the internal structure of a vertical variable primary air volume induction fan coil unit according to specific embodiment 1;

[0023] Figure 3 Schematic longitudinal section of a vertical variable primary air volume induction fan coil unit according to embodiment 1;

[0024] Figure 4 It is a schematic front cross-sectional view of a vertical variable primary air volume induction fan coil unit of specific embodiment 1;

[0025] Figure 5 Schematic cross-sectional view of a vertical variable primary air volume induction fan coil unit according to specific embodiment 1;

[0026] Figure 6 This is a schematic structural diagram of a double coil in series according to a specific embodiment 1;

[0027] Figure 7 Schematic diagram of the structure of the double-zone coil in specific embodiment 1;

[0028] Figure 8 Schematic diagram of the structure of a horizontal induction fan coil unit with variable primary air volume according to specific embodiment 1;

[0029] Figure 9 Schematic diagram of the internal structure of a horizontal variable primary air volume induction fan coil unit according to specific embodiment 1;

[0030] Figure 10 Schematic longitudinal cross-sectional view of a horizontal variable primary air volume induction fan coil unit according to specific embodiment 1;

[0031] Figure 11 Schematic diagram of the internal structure of a vertical variable primary air volume induction fan coil unit according to specific embodiment 2;

[0032] Figure 12 Schematic diagram of the internal structure of a horizontal variable primary air volume induction fan coil unit according to specific embodiment 2;

[0033] Figure 13 This is a schematic diagram of the internal structure of an induction-type fan coil unit with a variable primary air volume and a convection heat dissipation cavity according to specific embodiment 3;

[0034] Figure 14 This is a second schematic diagram of the internal structure of an induction-type fan coil unit with a variable primary air volume and a convection heat dissipation cavity according to specific embodiment 3;

[0035] Figure 15 This is a schematic structural diagram of the heat dissipation assembly of specific embodiment 3.

[0036] Reference numerals:

[0037] 100 - box body; 101 - fan chamber; 102 - induction chamber; 103 - partition plate; 104 - top plate; 105 - bottom plate; 106 - first side plate; 107 - second side plate; 108 - third side plate; 109 - fourth side plate; 110 - first return air inlet; 111 - second return air inlet; 112 - air inlet; 113 - first air outlet; 114 - first support plate; 115 - second support plate; 116 - first support; 117 - second support; 118 - second air outlet; 119 - convection heat dissipation chamber; 120 - heating air inlet; 121 - third air outlet;

[0038] 200 - heat exchange coil; 201 - first coil; 202 - second coil; 203 - first connecting pipe; 204 - second connecting pipe; 205 - connecting plate; 206 - main return pipe; 207 - first U-shaped coil; 208 - first fin; 209 - first heat exchange tube; 210 - first U-shaped tube; 211 - second U-shaped coil; 212 - second fin; 213 - second heat exchange tube; 214 - second U-shaped tube; 215 - first guard plate; 216 - second guard plate; 217 - third U-shaped coil; 218 - third guard plate; 219 - fourth guard plate; 220 - fifth guard plate; 221 - third fin; 222 - third heat exchange tube; 223 - third U-shaped tube;

[0039] 300-fan; 400-primary air nozzle; 500-return air nozzle; 600-duct unit; 601-primary air static pressure box; 602-return air static pressure box; 603-connecting box; 604-primary air inlet; 700-condensate tray; 701-condensate interface; 900-heat dissipation assembly; 901-fourth U-shaped coil; 902-heat sink. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0041] Example 1

[0042] A specific embodiment of the present invention is as follows Figures 1-10 As shown, an induction fan coil unit with variable primary air volume is disclosed. First, the structure of the vertical induction fan coil unit with variable primary air volume is described. Figure 2As shown, the vertical variable primary air volume induction fan coil includes a box body 100, a heat exchange coil 200, a fan 300, a primary air nozzle 400 and a return air nozzle 500. The inner cavity of the box body 100 is divided into a fan cavity 101 and an induction cavity 102. The fan 300 is arranged in the fan cavity 101, the primary air nozzle 400 and the return air nozzle 500 are arranged in the induction cavity 102, a part of the heat exchange area of ​​the heat exchange coil 200 is located in the fan cavity 101, and the other part of the heat exchange area is located in the induction cavity 102.

[0043] During implementation, indoor air can be introduced into the fan chamber 101 through the fan 300 to generate return air. After the return air is cooled or heated by the heat exchange zone of the heat exchange coil 200 arranged in the fan chamber 101, it is ejected at high speed by the return air nozzle 500 arranged in the induction chamber 102, inducing the indoor air to enter the induction chamber 102, generating return air induced wind. The return air induced wind is cooled or heated by the heat exchange zone of the heat exchange coil 200 in the induction chamber 102; the indoor air can also be induced into the induction chamber 102 by the primary air, generating primary air induced wind, and the primary air induced wind can also be cooled or heated by the heat exchange zone of the heat exchange coil 200 in the induction chamber 102.

[0044] In order to make the air in the fan chamber 101 and the induction chamber 102 flow in an orderly manner, Figure 5 As shown, the box body 100 also includes a partition plate 103, which is arranged in the inner cavity of the box body 100 to divide the inner cavity of the box body 100 into a fan cavity 101 and an induction cavity 102. The return air entering the fan cavity 101 can exchange heat with the heat exchange area of ​​the heat exchange coil 200 arranged in the fan cavity 101, and then be sprayed into the induction cavity 102 through the return air nozzle 500.

[0045] Considering the protection of other components provided in the box body 100, Figure 1 、 Figure 2 、 Figure 3 , pictures and Figure 5 As shown, the box body 100 further includes a top plate 104, a bottom plate 105, a first side plate 106, a second side plate 107, a third side plate 108, and a fourth side plate 109. At least a portion of the top plate 104 is parallel to the bottom plate 105, the first side plate 106 is parallel to the second side plate 107, and the third side plate 108 is parallel to the fourth side plate 109. A portion of the top plate 104, a portion of the bottom plate 105, a portion of the first side plate 106, a portion of the second side plate 107, the third side plate 108, and the partition plate 103 enclose a blower chamber 101; another portion of the top plate 104, another portion of the bottom plate 105, another portion of the first side plate 106, a portion of the second side plate 107, the fourth side plate 109, and the partition plate 103 enclose an induction chamber 102.

[0046] Preferably, the housing 100 is a substantially rectangular parallelepiped, with the first side panel 106 serving as the front panel of the housing 100, the second side panel 107 serving as the rear panel of the housing 100, and the third side panel 108 and the fourth side panel 109 serving as the left and right panels of the housing 100, respectively. It should be noted that the outlet of the primary air nozzle 400 is oriented forward, and facing the outlet of the primary air nozzle 400, the left side of a person is considered left, and the right side of a person is considered right.

[0047] In order to facilitate the air intake of the fan chamber 101 and the induction chamber 102, Figure 2 As shown, the bottom plate 105 is provided with a first return air port 110 and a second return air port 111, which are connected to the fan cavity 101 and the induction cavity 102 respectively. Figure 1 and Figure 2 As shown, an air inlet 112 is provided in the lower area of ​​the first side panel 106. The air inlet 112 is composed of a plurality of perforations provided in the lower part of the first side panel 106. The air inlet 112 spans the fan cavity 101 and the induction cavity 102 in length, that is, a part of the air inlet 112 (such as the left part) is connected to the fan cavity 101, and can supply air to or return air to the fan cavity 101, and another part of the air inlet 112 (such as the right part) is connected to the induction cavity 102, and can supply air to or return air to the induction cavity 102.

[0048] Understandably, if Figure 1 、 Figure 2 and Figure 3 As shown, the housing 100 is further provided with a first air outlet 113. The first air outlet 113 is provided on the top panel 104 and communicates with the induction chamber 102. Preferably, the first air outlet 113 is provided in a portion of the top panel 104 near the first side panel 106, with a portion of the top panel 104 tilted toward the first side panel 106 so that the first air outlet 113 faces obliquely upward. The first air outlet 113 is manually or electrically adjustable and can be opened, closed, and the air supply angle adjusted manually or electrically according to functional requirements.

[0049] In the vertical structure, the box body 100 is a rectangular parallelepiped structure and is generally placed on the floor for use. In order to ensure that there is a gap between the bottom of the box body 100 and the floor, so that the first return air vent 110 and the second return air vent 111 can return air smoothly and ensure the structural strength of the box body 100, reference Figure 4 and Figure 5As shown, the housing 100 further includes a first support plate 114, a second support plate 115, a first support 116, and a second support 117. The first support plate 114 and the second support plate 115 are both located in the inner cavity of the housing 100, the first support 116 is located directly below the first support plate 114, and the second support 117 is located directly below the second support plate 115. Since the first support 116 and the second support 117 have a certain height, the first return air inlet 110 and the second return air inlet 111 are prevented from being blocked, thereby preventing poor return air flow.

[0050] like Figure 1 As shown, the housing 100 is further provided with a second air outlet 118, which is provided on the top plate 104 and is located on one side of the first air outlet 113 and is connected to the fan chamber 101. The second air outlet 118 is manually adjustable or electrically adjustable, and the second air outlet 118 can be opened and closed manually or electrically according to functional requirements. The heat exchange coil 200 in this embodiment adopts a series double coil or a double zone coil. The series double coil and the double zone coil are described below respectively. Figure 2 、 Figure 5 and 6 As shown, when the heat exchange coil 200 is a series double coil, the series double coil includes a first coil 201 and a second coil 202, and the first heat exchange area of ​​the first coil 201 and the second heat exchange area of ​​the second coil 202 are respectively located in the fan cavity 101 and the induction cavity 102.

[0051] Considering the connection between the first coil 201 and the second coil 202, as shown in FIG. Figure 6 As shown, the series dual coils also include a first connecting pipe 203, a second connecting pipe 204, and a connecting piece 205. The first connecting pipe 203 and the second connecting pipe 204 connect the first coil 201 and the second coil 202 to form a fluid channel. The first connecting pipe 203 is a curved pipe that connects the water outlet of the first coil 201 and the water inlet of the second coil 202. The second connecting pipe 204 is a straight pipe that connects the main return pipe 206 of the first coil 201 and the water outlet of the second coil 202, thereby connecting the first coil 201 and the second coil 202. One end of the connecting piece 205 is socketed with one end of the first coil 201, and the other end of the connecting piece 205 is socketed with one end of the second coil 202. The first connecting pipe 203, the second connecting pipe 204, and the connecting piece 205 connect the first coil 201 and the second coil 202 into a single unit.

[0052] Specifically, if Figure 6As shown, the first coil 201 includes a first U-shaped coil 207, first fins 208, and the aforementioned main return pipe 206. The first U-shaped coil 207 is formed by a plurality of first heat exchange tubes 209 and first U-shaped tubes 210 connected end-to-end in an interlaced manner. The first heat exchange tubes 209 and the main return pipe 206 are arranged in parallel and pass through a plurality of roughly equidistant and parallel first fins 208 to form a first heat exchange zone. Similarly, the second coil 202 includes a second U-shaped coil 211 and second fins 212. The second U-shaped coil 211 is formed by a plurality of second heat exchange tubes 213 and second U-shaped tubes 214 connected end-to-end in an interlaced manner. The second heat exchange tubes 213 pass through a plurality of roughly equidistant and parallel second fins 212 to form a second heat exchange zone. The return air entering the fan chamber 101 flows through the first heat exchange zone of the first coil 201, and is cooled or heated after heat exchange with the air-conditioning cold water or air-conditioning hot water flowing through the first heat exchange tube 209. The primary induced air and return induced air entering the induction chamber 102 flow through the second heat exchange zone of the second coil 202, and are cooled or heated after heat exchange with the air-conditioning cold water or air-conditioning hot water flowing through the second heat exchange tube 213.

[0053] like Figure 6 As shown, the series double coils are further provided with a first guard plate 215 and a second guard plate 216 . The first guard plate 215 is provided at the front end of the first coil 201 , and the second guard plate 216 is provided at the rear end of the second coil 202 .

[0054] Preferably, the series double coil adopts a copper tube and aluminum fin structure, and the U-shaped coil (the first U-shaped coil 207 and the second U-shaped coil 211) can adopt any one of a single coil, two rows of tubes, and three rows of tubes. The length ratio of the first coil 201 to the second coil 202 is between 1:2 and 1:5.

[0055] When the heat exchange coil 200 adopts a double-zone coil, such as Figure 7As shown, the dual-zone coil includes a third U-shaped coil 217, a third guard plate 218, a fourth guard plate 219, a fifth guard plate 220 and a third fin 221. The third U-shaped coil 217 is formed by multiple third heat exchange tubes 222 and third U-shaped tubes 223 that are staggered and connected end to end. The third guard plate 218 is arranged at the front end of the third U-shaped coil 217, the fourth guard plate 219 is arranged in the middle of the third U-shaped coil 217, and the fifth guard plate 220 is arranged at the rear end of the third U-shaped coil 217; the third heat exchange tube 222 between the third guard plate 218 and the fourth guard plate 219 passes through a plurality of third fins 221 that are arranged in parallel at approximately equal distances to form a third heat exchange zone, and the third heat exchange tube 222 between the fourth guard plate 219 and the fifth guard plate 220 passes through a plurality of third fins 221 that are arranged in parallel at approximately equal distances to form a fourth heat exchange zone. The return air entering the fan chamber 101 flows through the third heat exchange zone, and is cooled or heated after undergoing heat exchange with the air-conditioning cold water or hot water flowing through the third heat exchange tube 222 through the third heat exchange tube 222 and the third fin 221. The primary induced air and return induced air entering the induction chamber 102 flow through the fourth heat exchange zone, and are cooled or heated after undergoing heat exchange with the air-conditioning cold water or hot water flowing through the third heat exchange tube 222 through the third heat exchange tube 222 and the third fin 221.

[0056] Preferably, the double-zone coil also adopts a copper tube and aluminum fin structure, and the third U-shaped coil 217 can adopt any one of a single coil, two rows of tubes, and three rows of tubes. The length ratio of the third heat exchange zone to the fourth heat exchange zone is between 1:2 and 1:5.

[0057] Furthermore, the heat exchange coil 200 can also be formed of two groups of ordinary coils, one group being provided in the fan cavity 101 and the other in the induction cavity 102. In other words, one group of heat exchange coils is provided in each of the fan cavity 101 and the induction cavity 102.

[0058] refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the vertical variable primary air volume induction fan coil unit also includes an air duct unit 600, which includes a primary air static pressure box 601, a return air static pressure box 602 and a connecting box 603. The primary air static pressure box 601, the return air static pressure box 602 and the connecting box 603 are all arranged in the induction chamber 102, and the primary air static pressure box 601 and the return air static pressure box 602 are both connected to the connecting box 603. The primary air nozzle 400 and the return air nozzle 500 are both arranged on the connecting box 603. The air in the primary air static pressure box 601 enters the connecting box 603 and is then ejected through the primary air nozzle 400. The air in the return air static pressure box 602 enters the connecting box 603 and is then ejected through the return air nozzle 500.

[0059] To prevent the primary air and return air from entering the connecting box 603 from mixing, the inner cavity of the connecting box 603 is divided into a first connecting cavity and a second connecting cavity. The first connecting cavity and the second connecting cavity are arranged alternately. The first connecting cavity communicates with the primary air plenum box 601 and the primary air nozzle 400, while the second connecting cavity communicates with the return air plenum box 602 and the return air nozzle 500. This structure ensures that the primary air nozzle 400 and the return air nozzle 500 are arranged alternately along the length of the connecting box 603.

[0060] like Figure 2 As shown, the fan 300 is arranged in the fan cavity 101, and the air outlet of the fan 300 is connected to the return air static pressure box 602 and the side wall adjacent to the fan cavity 101; preferably, the fan 300 adopts a centrifugal fan, the motor adopts a DC brushless motor or a variable motor, and the fan 300 can be powered by DC.

[0061] Preferably, the primary air static pressure box 601 is a rectangular parallelepiped structure, which is arranged at the bottom or rear of the induction chamber 102, and the front or upper part of the primary air static pressure box 601 is provided with a plurality of openings connected to the first communication chamber and evenly distributed along the length direction of the primary air static pressure box 601; Figure 2 As shown, a primary air inlet 604 is provided at the bottom or rear of the primary air plenum box 601. The return air plenum box 602 is a rectangular parallelepiped structure, disposed at the bottom or rear of the induction chamber 102. An opening is provided on one side of the return air plenum box 602 adjacent to the fan chamber 101, communicating with the air outlet of the fan 300. A plurality of evenly distributed openings are provided at the front or top of the return air plenum box 602, communicating with the second communication chamber.

[0062] Through the arrangement of the above-mentioned structure, the primary air enters the primary air static pressure box 601 from the primary air inlet 604, enters the first connecting cavity through the opening on the primary air static pressure box 601, flows into the primary air nozzle 400 through the air inlet of the primary air nozzle 400 from the opening on the first connecting cavity, and is ejected at a high speed by the primary air nozzle 400; the return air entering the fan cavity 101 is pressurized by the fan 300, enters the return air static pressure box 602 from the air outlet of the fan 300 through the opening of the return air static pressure box 602, enters the second connecting cavity through the opening on the return air static pressure box 602, flows into the return air nozzle 500 through the air inlet of the return air nozzle 500 from the opening on the second connecting cavity, and is ejected at a high speed by the return air nozzle 500.

[0063] refer to Figure 2 and Figure 3As shown, this embodiment further includes a condensate pan 700, which is disposed at the bottom of the heat exchange coil 200. A condensate port 701 is provided on one side or at the bottom of the condensate pan 700. Air-conditioning condensate generated when the heat exchange coil 200 operates in a wet cooling mode in summer flows into the condensate pan 700 and then flows out through the condensate port 701. Preferably, when the heat exchange coil 200 operates in a dry cooling mode in summer, the condensate pan 700 and the corresponding condensate port 701 are not provided.

[0064] The horizontal variable primary air volume induction fan coil unit of this embodiment is different from the vertical variable primary air volume induction fan coil unit in that: Figure 8 、 Figure 9 and Figure 10 As shown, the first air outlet 113 is provided on the first side panel 106, the top panel 104 is parallel to the bottom panel 105, the air inlet 112 is no longer provided on the first side panel 106, and the second air outlet 118 is no longer provided on the top panel 104. The fan chamber 101 only relies on the first return air port 110 on the bottom panel 105 for air intake, and the induction chamber 102 only relies on the second return air port 111 on the bottom panel 105 for air intake. The first support plate 114, the second support plate 115, the first support 116 and the second support 117 are also not provided. The other structures are the same as those of the vertical fan coil air conditioner and will not be described in detail here. It should be noted that since the first support 116 and the second support 117 are not provided, the fan coil air conditioner needs to avoid blocking the return air port at the bottom during installation. For example, it can be installed in a suspended manner.

[0065] Example 2

[0066] Another specific embodiment of the present invention is as follows Figure 11-12 As shown, an induction fan coil with variable primary air volume is disclosed. The difference from Example 1 is that no heat exchange device is provided in the fan cavity 101, and only a heat exchange coil 200 is provided in the induction cavity 102. The heat exchange coil 200 adopts an ordinary coil, and the second air outlet 118 is not provided on the top plate 104. The other structures are the same as those of Example 1 and will not be described in detail here.

[0067] Example 3

[0068] Another specific embodiment of the present invention is as follows Figure 13-15As shown, an induction fan coil unit with variable primary air volume is disclosed. The difference from the vertical induction fan coil unit with variable primary air volume in Example 1 and Example 2 is that the box body 100 is further provided with a convection heat dissipation cavity 119, which is arranged at the rear of the inner cavity of the box body 100. A heating air inlet 120 is provided at the bottom or rear of the convection heat dissipation cavity 119, and a third air outlet 121 is provided on the top. The third air outlet 121 is located behind the first air outlet 113. A heat dissipation component 900 is provided in the convection heat dissipation cavity 119, and the heat dissipation component 900 includes a fourth U-shaped coil 901 and a heat sink 902. The heat sink 902 includes a plurality of L-shaped fins, which are connected to form an arched structure with front and rear openings. Tube holes are evenly distributed along the length direction of the L-shaped fins. The heat exchange tubes of the fourth U-shaped coil 901 are sleeved in the tube holes, and the L-shaped fins are installed on the heat exchange tubes through the tube holes to achieve heat conduction and heat exchange with the heat exchange tubes. Preferably, the fourth U-shaped coil 901 is made of copper tube, and the L-shaped fin is made of steel plate or aluminum plate. Other structures are the same as those of the vertical units of Examples 1 and 2, and will not be described in detail here.

[0069] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. An induction fan coil unit with variable primary air volume, characterized in that: The invention comprises a housing (100) and a heat exchange coil (200), wherein the inner cavity of the housing (100) is divided into a fan cavity (101) and an induction cavity (102), and the heat exchange coil (200) is a series double coil or a double-zone coil. When the heat exchange coil (200) is a series double coil, the series double coil comprises a first coil (201) and a second coil (202), and the second coil is located in the induction cavity (102). When the heat exchange coil (200) is a double-zone coil, the double-zone coil comprises a third heat exchange zone and a fourth heat exchange zone, and the fourth heat exchange zone is located in the induction cavity (102).

2. The induction fan coil unit with variable primary air volume according to claim 1 is characterized in that: The series double coils further include a first connecting pipe (203), a second connecting pipe (204) and a connecting piece (205); the first connecting pipe (203) and the second connecting pipe (204) connect the first coil (201) and the second coil (202) to form a fluid channel; one end of the connecting piece (205) is connected to one end of the first coil (201), and the other end of the connecting piece (205) is connected to one end of the second coil (202).

3. The induction fan coil unit with variable primary air volume according to claim 1, characterized in that: The first coil (201) or the fourth heat exchange zone is located in the fan cavity (101).

4. The induction fan coil unit with variable primary air volume according to claim 1, characterized in that: The first coil (201) comprises a first U-shaped coil (207), first fins (208) and a main return water pipe (206); the first U-shaped coil (207) is formed by a plurality of first heat exchange tubes (209) and first U-shaped tubes (210) connected end to end in an interlaced manner; the first heat exchange tubes (209) pass through the first fins (208) arranged in parallel at equal intervals to form a first heat exchange zone.

5. The induction fan coil unit with variable primary air volume according to claim 1, characterized in that: The second coil (202) comprises a second U-shaped coil (211) and second fins (212); the second U-shaped coil (211) is formed by a plurality of second heat exchange tubes (213) and second U-shaped tubes (214) connected end to end in an alternating manner; the second heat exchange tubes (213) pass through the second fins (212) that are arranged equidistantly and in parallel to form a second heat exchange zone.

6. The induction fan coil unit with variable primary air volume according to claim 1, characterized in that: The series-connected double coil further includes a first guard plate (215) and a second guard plate (216), wherein the first guard plate (215) is arranged at one end of the first coil (201), and the second guard plate (216) is arranged at one end of the second coil (202).

7. The induction fan coil unit with variable primary air volume according to claim 1, characterized in that: The dual-zone coil comprises a third U-shaped coil (217), a third guard plate (218), a fourth guard plate (219) and a fifth guard plate (220); the third U-shaped coil (217) is formed by a plurality of third heat exchange tubes (222) and third U-shaped tubes (223) connected end to end in an interlaced manner; the third guard plate (218) is arranged at one end of the third U-shaped coil (217); the fourth guard plate (219) is arranged in the middle of the third U-shaped coil (217); and the fifth guard plate (220) is arranged at the other end of the third U-shaped coil (217).

8. The induction fan coil unit with variable primary air volume according to claim 7, characterized in that: The dual-zone coil further includes a third fin (221), the third heat exchange tube (222) between the third guard plate (218) and the fourth guard plate (219) passes through the third fins (221) arranged in parallel at equal intervals to form the third heat exchange zone, and the third heat exchange tube (222) between the fourth guard plate (219) and the fifth guard plate (220) passes through the third fins (221) arranged in parallel at equal intervals to form the fourth heat exchange zone.

9. The induction fan coil unit with variable primary air volume according to any one of claims 1 to 8, characterized in that: It also includes a fan (300), a primary air nozzle (400), a return air nozzle (500), an air duct unit (600), and a condensate tray (700) arranged in the box (100).

10. The induction fan coil unit with variable primary air volume according to claim 9, characterized in that: A convection heat dissipation cavity (119) is provided in the box body (100).

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