Return air reheating type fan coil

Abstract

The utility model discloses a return air reheating type fan coil which comprises a heat exchange coil, an air inlet mechanism is arranged at the air inlet end of the heat exchange coil, an air mixing mechanism is arranged at the air inlet end of the air inlet mechanism, and an air supply structure is arranged at the air exhaust end of the heat exchange coil. The air mixing mechanism comprises an air mixing box, an air return box and an air return and supply box; an air guide mechanism is arranged at the exhaust end of the air return box and located between the air inlet end of the air return and supply box and the air inlet end of the air inlet mechanism. Under the suction of the air feeder, indoor return air and outdoor fresh air enter the air mixing box through the return air inlet and the fresh air inlet, are mixed and then fed into the heat exchange coil pipe by the air feeder, and are fed into the air supply pipe after the dew-point temperature is reached, and the other part of indoor return air enters the air supply pipe through an air outlet of the return air and air supply box; and the air is secondarily mixed with low-temperature air from the heat exchange coil pipe, so that the low-temperature air is reheated, a user does not feel cold air, and the comfort degree is improved.

Description

Technical Field

[0001] The utility model relates to the field of ventilation and air conditioning, and particularly relates to a return air reheating type fan coil unit. Background Art

[0002] In the existing fan coil unit plus fresh air air conditioning water system and direct expansion type fan coil unit air conditioning system, the system end uses a fan coil unit to process indoor air. The processed air is cooled and dehumidified and is in a dew point state, with a low temperature and a high relative humidity. If it is directly sent into the room, people will feel wet and cold, and the user experience is poor. Moreover, the existing central air conditioning unit is placed in the air conditioning machine room to centrally process the return air of each room and then send it back to each room. The air conditioning machine room occupies space area and increases costs. Moreover, when there is an infectious virus in the return air of a certain room, the probability of virus spread is increased. Content of the Utility Model

[0003] The purpose of the utility model is to provide a return air reheating type fan coil unit to solve the problems put forward in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A return air reheating type fan coil unit, including a heat exchange coil. An air inlet mechanism is arranged at the air inlet end of the heat exchange coil. A mixed air mechanism is arranged at the air inlet end of the air inlet mechanism. A air supply structure is arranged at the air exhaust end of the heat exchange coil.

[0005] The mixed air mechanism includes a mixed air box, a return air box and a return air and supply air box. The air exhaust ends of the mixed air box and the return air box are both communicated with the air inlet end of the air inlet mechanism. The air inlet end of the return air and supply air box is communicated with the air inlet end of the air inlet mechanism. The air exhaust end of the return air and supply air box is communicated with the air inlet end of the air supply structure. The return air and supply air box is used for mixing indoor return air.

[0006] A wind guiding mechanism is arranged at the air exhaust end of the return air box and between the air inlet end of the return air and supply air box and the air inlet end of the air inlet mechanism. The wind guiding mechanism is used for guiding the air in the return air box to the air inlet end of the heat exchange coil and the air inlet end of the return air and supply air box respectively.

[0007] Preferably, the air inlet mechanism includes an air inlet box. The air inlet end of the air inlet box is communicated with the air exhaust ends of the mixed air box and the return air box. The wind guiding mechanism is arranged at the air inlet end of the air inlet box and close to the air inlet end of the return air and supply air box. The air exhaust end of the air inlet box is communicated with the air inlet end of the heat exchange coil.

[0008] Preferably, a fresh air inlet is arranged at the air inlet end of the mixed air box for the entry of outdoor air. A first return air inlet is arranged on one side of the mixed air box. A second return air inlet is arranged on one side of the return air box. Both the first return air inlet and the second return air inlet are used for the entry of indoor air.

[0009] Preferably, a blower is provided at the exhaust end of the air mixing box. The blower is used to mix the indoor and outdoor air in the air mixing box and send it to the intake end of the air intake box. A return air fan is provided at the exhaust end of the return air box. The return air fan is used to transport the indoor air in the return air box to the intake end of the air intake box.

[0010] Preferably, a refrigerant pipe is provided on one side of the heat exchange coil. A condensate drain is provided at the exhaust end of the heat exchange coil and at the exhaust end of the return air supply box and is located at the intake end of the air supply structure.

[0011] Preferably, the air supply structure includes an air supply pipe. The intake end of the air supply pipe communicates with the exhaust end of the heat exchange coil and the exhaust end of the return air supply box. A humidifier is provided at the intake end of the air supply pipe, and an air supply port is provided at the exhaust end of the air supply pipe.

[0012] Preferably, the air guiding mechanism includes:

[0013] A return air baffle, which is provided at the intake end of the air intake box and the exhaust end of the return air box. A vertical plate is provided at the bottom end of the return air baffle. A through hole is provided in the middle of the vertical plate, and a return air channel is provided on the back of the vertical plate at the through hole.

[0014] A return air valve, which is inserted and connected to one end of the return air baffle and is located at the intake end of the return air supply box.

[0015] Preferably, a plurality of partition plates are provided in the middle of the return air valve. A rotating support rod is inserted through the middle of each of the plurality of partition plates. The two ends of each of the plurality of rotating support rods are respectively rotatably inserted through the two walls of the return air valve. A wind baffle is provided in the through hole. A control rotating rod is inserted through the middle of the wind baffle. The top of the control rotating rod extends through to the top end of the return air baffle. A linkage mechanism is provided between one end of each of the plurality of rotating support rods close to the vertical plate and the top of the control rotating rod. The linkage mechanism is provided in the middle of the return air baffle. The linkage mechanism is used to synchronously control the setting angles of the wind baffle and the plurality of partition plates.

[0016] Preferably, the linkage mechanism includes a control member and a transmission member;

[0017] The control member includes a differential bevel gear and a full-tooth bevel gear. The differential bevel gear is sleeved on the top of the control rotating rod. The tooth sides of the differential bevel gear and the full-tooth bevel gear are meshed with each other;

[0018] The transmission member includes a rotating sprocket and a transmission chain. A plurality of rotating sprockets are respectively sleeved on the ends of the plurality of rotating support rods. The transmission chain is meshed and sleeved on the outer walls of the plurality of rotating sprockets.

[0019] Preferably, a transmission rod is inserted into the middle of the full-tooth bevel gear, and a shift sprocket is sleeved on the end of the transmission rod away from the full-tooth bevel gear, and the shift sprocket is meshed with the outer ring wall of the transmission chain, and the tooth side of the heterogeneous bevel gear occupies one third of the area of its outer ring wall.

[0020] Technical effects and advantages of the utility model:

[0021] (1) The utility model designs a return air reheating fan coil, opens the fresh air inlet and the return air inlet, starts the supply fan and the return air fan, connects the refrigerant of the heat exchange coil, and under the suction of the supply fan, the indoor return air passes through the first return air inlet and the outdoor fresh air passes through the fresh air inlet into the mixing box, and is sent into the heat exchange coil by the supply fan after mixing. After the air is treated, it reaches the dew point temperature and is then sent into the supply air duct. Another part of the indoor return air enters the return air box through the second return air inlet under the suction of the return fan, and is sent into the return air supply box by the return fan, and then enters the supply air duct through the return air supply box outlet, and is mixed with the low-temperature air from the heat exchange coil for the second time. Since the indoor return air temperature is relatively high, the low-temperature air is reheated after the two are mixed, reaching the air supply point temperature designed for the air conditioner, and is sent to the room through the supply air inlet at the end. The user does not feel the cold wind, and the comfort is improved;

[0022] (2) Since the reheating heat of the utility model comes from the indoor return air, there is no increase in heat load, thus achieving energy saving. At the same time, the air supply temperature is increased, the relative humidity is reduced, the designed air supply parameters are achieved, and the human comfort is improved. The utility model can also process fresh air and has the function of a central air conditioning unit, which can eliminate the air conditioning room and save investment for customers.

[0023] (3) The utility model is provided with an air guide mechanism, through which the air volume entering the air inlet box and the return air supply box can be adjusted, thereby further ensuring the mixing between the indoor air and the treated air, so that the corresponding air volume can be adjusted according to the actual air supply demand. Through such a setting, the temperature adjustment of the device is more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the air supply principle of the overall structure with an air guide mechanism of the utility model.

[0025] Figure 2 It is a schematic diagram of the overall structure of the air guide mechanism of the utility model.

[0026] Figure 3 It is a side view of the overall structure of the air guide mechanism of the utility model.

[0027] Figure 4 It is a top view of the overall structure of the air guide mechanism of the utility model.

[0028] Figure 5 It is a top sectional view of the overall structure of the air guide mechanism of the utility model.

[0029] Figure 6 It is a structural schematic diagram of the linkage mechanism of the utility model.

[0030] Figure 7 It is a schematic diagram of the air supply principle of the overall structure of the utility model without the air guide mechanism.

[0031] In the figure: 1. heat exchange coil; 2. mixing box; 3. air inlet box; 4. air supply duct; 5. return air box; 6. return air supply box; 7. fresh air inlet; 8. first return air inlet; 9. second return air inlet; 10. supply fan; 11. return fan; 12. refrigerant pipe; 13. condensate outlet; 14. humidifier; 15. supply air outlet; 16. return air valve; 1601. baffle plate; 1602. rotating support rod; 1603. rotating sprocket; 17. return air baffle; 1701. vertical plate; 18. return air channel; 19. control lever; 1901. wind shield; 20. transmission chain; 21. heterogeneous bevel gear; 22. full bevel gear; 23. transmission rod; 24. toggle sprocket. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Embodiment 1, the utility model provides as follows Figures 1-6 The return air reheat type fan coil shown includes a heat exchange coil 1, an air inlet mechanism is provided at the air inlet end of the heat exchange coil 1, an air mixing mechanism is provided at the air inlet end of the air inlet mechanism, and an air supply structure is provided at the air outlet end of the heat exchange coil 1;

[0034] The air mixing mechanism includes an air mixing box 2, a return air box 5 and a return air supply box 6. The exhaust ends of the air mixing box 2 and the return air box 5 are both connected to the air inlet end of the air inlet mechanism. The air inlet end of the return air supply box 6 is connected to the air inlet end of the air inlet mechanism. The exhaust end of the return air supply box 6 and the air inlet end of the air supply structure are connected to each other. The return air supply box 6 is used for mixing indoor return air.

[0035] An air guide mechanism is provided at the exhaust end of the return air box 5 and between the air inlet end of the return air supply box 6 and the air inlet end of the air inlet mechanism. The air guide mechanism is used to guide the air in the return air box 5 to the air inlet end of the heat exchange coil 1 and the air inlet end of the return air supply box 6 respectively.

[0036] It should be noted that the fan coil unit designed by this device is combined and connected by a heat exchange coil 1, a supply fan 10, a return fan 11, a mixing air box 2, a return air box 5, an air inlet box 3, a return air and supply air box 6, a supply air duct 4, a fresh air inlet 7, a first return air inlet 8, a second return air inlet 9, and a supply air outlet 15, and all the structures are installed in a housing. The housing can be installed in a ceiling, or be a floor-standing type, or a wall-mounted type.

[0037] Specifically, the air inlet mechanism includes an air inlet box 3. The air inlet end of the air inlet box 3 communicates with the exhaust ends of the mixing air box 2 and the return air box 5. The air guiding mechanism is arranged at the air inlet end of the air inlet box 3 and close to the air inlet end of the return air and supply air box 6. The exhaust end of the air inlet box 3 communicates with the air inlet end of the heat exchange coil 1.

[0038] It should be noted that there is a sealed partition between the mixing air box 2 and the return air box 5 to ensure the relative independence of the air inlets of the two.

[0039] Furthermore, a fresh air inlet 7 is arranged at the air inlet end of the mixing air box 2 for the entry of outdoor air. A first return air inlet 8 is arranged on one side of the mixing air box 2, and a second return air inlet 9 is arranged on one side of the return air box 5. Both the first return air inlet 8 and the second return air inlet 9 are for the entry of indoor air.

[0040] Still further, a supply fan 10 is arranged at the exhaust end of the mixing air box 2. The supply fan 10 is used to mix the indoor and outdoor air in the mixing air box 2 and send it to the air inlet end of the air inlet box 3. A return fan 11 is arranged at the exhaust end of the return air box 5. The return fan 11 is used to convey the indoor air in the return air box 5 to the air inlet end of the air inlet box 3.

[0041] It should be noted that the supply fan 10 and the return fan 11 are variable-speed fans, and the air pressures of the two should be the same. They adopt a single motor or a coaxial motor. Figure 1 Among them, a coaxial motor is used. The fresh air inlet 7, the first return air inlet 8, and the second return air inlet 9 are manual or electric adjustable air outlets.

[0042] Specifically, a refrigerant pipe 12 is arranged on one side of the heat exchange coil 1. A condensate drain 13 is arranged at the exhaust end of the heat exchange coil 1 and at the exhaust end of the return air and supply air box 6 and at the air inlet end of the air supply structure.

[0043] It should be noted that the heat exchange coil 1 is connected to air-conditioning chilled / hot water or refrigerant through the refrigerant pipe 12 for heating or cooling according to the actual situation. There is a condensate pan under the heat exchange coil 1. There is a condensate drain 13 at the connection of the air outlet of the heat exchange coil 1, the air outlet of the return air and supply air box 6, and the supply air duct 4. The high-temperature return air in the room is mixed with the low-temperature air from the heat exchange coil 1 here, and condensate may be generated and can be discharged from here.

[0044] Further, the air supply structure includes an air supply duct 4. The air inlet end of the air supply duct 4 communicates with the air exhaust end of the heat exchange coil 1 and the air exhaust end of the return air supply box 6. A humidifier 14 is provided at the air inlet end of the air supply duct 4, and an air supply port 15 is provided at the air exhaust end of the air supply duct 4. The air supply duct 4 has one or more air supply ports 15. The air supply duct 4 should be insulated. The humidifier 14 is used for humidification in winter.

[0045] Specifically, the air guiding mechanism includes:

[0046] A return air baffle 17 is arranged at the air inlet end of the air inlet box 3 and the air exhaust end of the return air box 5. A vertical plate 1701 is provided at the bottom end of the return air baffle 17. A through hole is formed in the middle of the vertical plate 1701, and a return air channel 18 is arranged at the back of the vertical plate 1701 at the through hole.

[0047] It should be noted that through the setting of the vertical plate 1701, the wind entering the air inlet box 3 is blocked, so that air distribution can be carried out, and the return air channel 18 can better gather and guide the air.

[0048] A return air valve 16 is inserted and connected to one end of the return air baffle 17 and is located at the air inlet end of the return air supply box 6. An insertion hole is formed at one end of the return air baffle 17, and the return air valve 16 is tightly clamped in the insertion hole.

[0049] Further, a plurality of partition plates 1601 are arranged in the middle of the return air valve 16. A rotating support rod 1602 is inserted through the middle of each of the plurality of partition plates 1601. Both ends of the plurality of rotating support rods 1602 are respectively rotatably inserted and connected to the two walls of the return air valve 16. A wind baffle 1901 is arranged in the through hole. A control rotating rod 19 is inserted through the middle of the wind baffle 1901. The top of the control rotating rod 19 extends through the top end of the return air baffle 17. A linkage mechanism is arranged between one end of the plurality of rotating support rods 1602 close to the vertical plate 1701 and the top of the control rotating rod 19. The linkage mechanism is arranged in the middle of the return air baffle 17, and the linkage mechanism is used to synchronously control the setting angles of the wind baffle 1901 and the plurality of partition plates 1601.

[0050] Through the setting of the partition plates 1601, the ventilation volume of the return air valve 16 can be adjusted. At the same time, through the setting of the partition plates 1601, the return air valve 16 can also be completely closed.

[0051] Furthermore, the linkage mechanism includes a control member and a transmission member;

[0052] The control member includes a bevel gear with uneven teeth 21 and a bevel gear with full teeth 22. The bevel gear with uneven teeth 21 is sleeved on the top of the control rotating rod 19, and the tooth sides of the bevel gear with uneven teeth 21 and the bevel gear with full teeth 22 are meshed with each other;

[0053] The transmission member includes a rotating sprocket 1603 and a transmission chain 20 . The plurality of rotating sprockets 1603 are respectively sleeved on the ends of the plurality of rotating struts 1602 . The transmission chain 20 is meshedly sleeved on the outer walls of the plurality of rotating sprockets 1603 .

[0054] Furthermore, a transmission rod 23 is inserted into the middle of the full-tooth bevel gear 22, and a shift sprocket 24 is sleeved on one end of the transmission rod 23 away from the full-tooth bevel gear 22, and the shift sprocket 24 is meshed with the outer ring wall of the transmission chain 20, and the tooth side of the heterogeneous bevel gear 21 occupies one third of the area of its outer ring wall.

[0055] It should be noted that the direction of rotation can be changed through the meshing transmission between the heterogeneous bevel gear 21 and the full-tooth bevel gear 22. In the actual operation process, the control lever 19 is rotated, and the windshield 1901 rotates under its drive. At the same time, the heterogeneous bevel gear 21 rotates synchronously and meshes with the full-tooth bevel gear 22, so that the full-tooth bevel gear 22 rotates synchronously. At this time, the transmission rod 23 is driven to rotate, so that the sprocket 24 rotates synchronously. At this time, under the meshing transmission, the sprocket 24 drives the transmission chain 20 to rotate. The rotating sprockets 1603 rotate synchronously under the meshing transmission, so that the rotating support rod 1602 rotates and drives the baffle plate 1601 to rotate, thereby adjusting the opening and closing size of the return air valve 16. The structural design of the heterogeneous bevel gear 21 with only one-third of the tooth side makes it possible to adjust the rotation angle of the wind shield plate 1901 with a buffer space when adjusting the opening size of the return air valve 16, so that when the return air valve 16 is in the closed state, the wind shield plate 1901 can also use the buffer margin to maintain the open state.

[0056] During actual use, when operating in summer for refrigeration, the fresh air inlet 7, the first return air inlet 8, and the second return air inlet 9 are opened, the supply fan 10 and the return fan 11 are started, and the refrigerant of the heat exchange coil 1 is connected. Under the suction of the supply fan 10, the indoor return air enters the mixing air box 2 through the first return air inlet 8, and the outdoor fresh air enters the mixing air box 2 through the fresh air inlet 7. After mixing, it is sent into the air inlet box 3 by the supply fan 10. Another part of the indoor return air enters the return air box 5 through the second return air inlet 9 under the suction of the return fan 11, and is sent into the return air duct 18 by the return fan 11. A part of the return air enters the return air supply box 6 through the return air valve 16, and another part of the return air is sent into the air inlet box 3, further mixed with the fresh air and return air from the mixing air box 2, then enters the heat exchange coil 1, is cooled and dehumidified to reach the dew point temperature, and then is sent into the supply air duct 4, and is mixed with the indoor return air from the return air supply box 6 for the second time. Since the temperature of the indoor return air is relatively high, after the two are mixed, it reheats the low-temperature air, reaches the designed supply air point temperature of the air conditioner, and is sent into the room through the supply air outlet 15 at the end. The user has no feeling of cold wind, improving the comfort level. By adjusting parameters such as the opening degrees of the fresh air inlet 7, the first return air inlet 8, and the second return air inlet 9, the rotation speeds of the supply fan 10 and the return fan 11, and the flow rate of the refrigerant in the heat exchange coil 1, relying on the automatic control system, the balanced and stable operation of the system is realized.

[0057] When operating in winter for heating, the fresh air inlet 7, the first return air inlet 8, and the second return air inlet 9 are opened, the supply fan 10 and the return fan 11 are started, the return air valve 16 is closed, and the heat medium of the heat exchange coil 1 is connected. Under the suction of the supply fan 10, the indoor return air enters the mixing air box 2 through the first return air inlet 8, and the outdoor fresh air enters the mixing air box 2 through the fresh air inlet 7. After mixing, it is sent into the air inlet box 3 by the supply fan 10. Another part of the indoor return air enters the return air box 5 through the second return air inlet 9 under the suction of the return fan 11, and is sent into the air inlet box 3 through the return air duct 18 by the return fan 11, further mixed with the fresh air and return air from the mixing air box 2, then enters the heat exchange coil 1 to be heated, and then is sent into the supply air duct 4, and finally is sent into the room through the supply air outlet 15 at the end.

[0058] Embodiment 2, the present utility model provides a Figure 7 return air reheating type fan coil unit as shown, including a heat exchange coil 1, a mixing air mechanism is arranged at the air inlet end of the heat exchange coil 1, and a supply air structure is arranged at the air outlet end of the heat exchange coil 1;

[0059] The mixing air mechanism includes a mixing air box 2, a return air box 5, and a return air supply box 6. The air outlet end of the mixing air box 2 is in through connection with the air inlet end of the heat exchange coil 1. The air outlet end of the return air box 5 is in through connection with the air inlet end of the return air supply box 6. An air inlet mechanism is arranged at the air outlet end of the return air supply box 6, and the return air supply box 6 is used for mixing indoor return air.

[0060] The air inlet mechanism includes an air inlet box 3. The air inlet end of the air inlet box 3 is in through connection with the air outlet end of the return air supply box 6 and the air outlet end of the heat exchange coil 1.

[0061] The air inlet end of the air mixing box 2 is provided with a fresh air inlet 7 for the entry of outdoor air. One side of the air mixing box 2 is provided with a first return air inlet 8, and one side of the return air box 5 is provided with a second return air inlet 9. Both the first return air inlet 8 and the second return air inlet 9 are for the entry of indoor air.

[0062] The air outlet end of the air mixing box 2 is provided with a blower 10 for mixing the indoor and outdoor air in the air mixing box 2 and sending it into the air inlet end of the heat exchange coil 1. The air outlet end of the return air box 5 is provided with a return air blower 11 for conveying the indoor air in the return air box 5 back to the air inlet end of the return air supply box 6.

[0063] One side of the heat exchange coil 1 is provided with a refrigerant pipe 12. A condensate drain 13 is provided at the air outlet end of the heat exchange coil 1 and the air outlet end of the return air supply box 6 and is located inside the air inlet box 3.

[0064] The air supply structure includes an air supply pipe 4. The air inlet end of the air supply pipe 4 is in through connection with the air outlet end of the heat exchange coil 1. A humidifier 14 is provided at the air inlet end of the air supply pipe 4, and an air supply outlet 15 is provided at the air outlet end of the air supply pipe 4.

[0065] During actual use, when operating in summer for refrigeration, the fresh air inlet 7, the first return air inlet 8, and the second return air inlet 9 are opened, the blower 10 and the return air blower 11 are started, and the refrigerant of the heat exchange coil 1 is connected. Under the suction of the blower 10, the indoor return air enters the air mixing box 2 through the first return air inlet 8, and the outdoor fresh air enters the air mixing box 2 through the fresh air inlet 7. After mixing, it is sent into the heat exchange coil 1 by the blower 10 to cool and dehumidify the air to reach the dew point temperature, and then sent into the air supply pipe 4. Another part of the indoor return air enters the return air box 5 through the second return air inlet 9 under the suction of the return air blower 11, is sent into the return air supply box 6 by the return air blower 11, and then enters the air supply pipe 4 through the air outlet of the return air supply box 6 to be mixed with the low-temperature air from the heat exchange coil 1 for the second time. Since the temperature of the indoor return air is relatively high, after the two are mixed, it reheats the low-temperature air, reaches the designed air supply point temperature of the air conditioner, and is sent to the indoor through the air supply outlet 15 at the end. The user does not feel the cold air, improving the comfort. By adjusting parameters such as the opening degrees of the fresh air inlet 7, the first return air inlet 8, and the second return air inlet 9, the rotation speeds of the blower 10 and the return air blower 11, and the flow rate of the refrigerant in the heat exchange coil 1, and relying on the automatic control system, the balanced and stable operation of the system is achieved.

[0066] When operating in winter for heating, the fresh air inlet 7 and the first return air inlet 8 are opened, the blower 10 is started, the return air blower 11 stops operating, the second return air inlet 9 is closed, and the heat medium of the heat exchange coil 1 is connected. Under the suction of the blower 10, the indoor return air enters the air mixing box 2 through the first return air inlet 8, and the outdoor fresh air enters the air mixing box 2 through the fresh air inlet 7. After mixing, it is sent into the heat exchange coil 1 by the blower 10 to heat the air, and then sent into the air supply pipe 4 and then sent to the indoor through the air supply outlet 15 at the end.

[0067] Since the reheating heat is from the indoor return air, without increasing the heat load, energy conservation is achieved. At the same time, the supply air temperature is increased, the relative humidity is reduced, the designed supply air parameters are reached, and the human comfort is improved. It can also handle fresh air, has the functions of a central air-conditioning unit, can cancel the air-conditioning machine room, and saves investment for customers.

[0068] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. The return air reheating type fan coil unit, including a heat exchange coil (1), is characterized in that, An air inlet mechanism is provided at the air inlet end of the heat exchange coil (1). A mixed air mechanism is provided at the air inlet end of the air inlet mechanism. A air supply structure is provided at the air exhaust end of the heat exchange coil (1). The mixed air mechanism includes a mixed air box (2), a return air box (5) and a return air and supply air box (6). The air exhaust ends of the mixed air box (2) and the return air box (5) are both communicated with the air inlet end of the air inlet mechanism. The air inlet end of the return air and supply air box (6) is communicated with the air inlet end of the air inlet mechanism. The air exhaust end of the return air and supply air box (6) is communicated with the air inlet end of the air supply structure. The return air and supply air box (6) is used for mixing indoor return air. A wind guiding mechanism is provided at the air exhaust end of the return air box (5) and located between the air inlet end of the return air and supply air box (6) and the air inlet end of the air inlet mechanism. The wind guiding mechanism is used to guide the air in the return air box (5) to the air inlet end of the heat exchange coil (1) and the air inlet end of the return air and supply air box (6) respectively.

2. The reheat type fan coil unit according to claim 1, wherein, The air inlet mechanism includes an air inlet box (3). The air inlet end of the air inlet box (3) is communicated with the air exhaust ends of the mixed air box (2) and the return air box (5). The wind guiding mechanism is arranged at the air inlet end of the air inlet box (3) and close to the air inlet end of the return air and supply air box (6). The air exhaust end of the air inlet box (3) is communicated with the air inlet end of the heat exchange coil (1).

3. The return air reheating type fan coil unit according to claim 2, wherein, A fresh air inlet (7) is provided at the air inlet end of the mixed air box (2). The fresh air inlet (7) is used for the entry of outdoor air. A first return air inlet (8) is provided on one side of the mixed air box (2). A second return air inlet (9) is provided on one side of the return air box (5). Both the first return air inlet (8) and the second return air inlet (9) are used for the entry of indoor air.

4. The return air reheating type fan coil unit according to claim 3, wherein, A air supply fan (10) is provided at the air exhaust end of the mixed air box (2). The air supply fan (10) is used to mix the indoor and outdoor air in the mixed air box (2) and send it into the air inlet end of the air inlet box (3). A return air fan (11) is provided at the air exhaust end of the return air box (5). The return air fan (11) is used to transport the indoor air in the return air box (5) to the air inlet end of the air inlet box (3).

5. The return air reheating type fan coil unit according to claim 2, wherein, A refrigerant pipe (12) is provided on one side of the heat exchange coil (1). A condensate drain port (13) is provided at the air exhaust end of the heat exchange coil (1) and the air exhaust end of the return air and supply air box (6) and located at the air inlet end of the air supply structure.

6. The reheat type fan coil unit according to claim 5, characterized in that, The air supply structure includes an air supply pipe (4). The air inlet end of the air supply pipe (4) is communicated with the air exhaust ends of the heat exchange coil (1) and the return air and supply air box (6). A humidifier (14) is provided at the air inlet end of the air supply pipe (4). A air supply outlet (15) is provided at the air exhaust end of the air supply pipe (4).

7. The return air reheating type fan coil unit according to claim 2, characterized in that, The wind guiding mechanism includes: A return air baffle (17). The return air baffle (17) is arranged at the air inlet end of the air inlet box (3) and the air exhaust end of the return air box (5). A vertical plate (1701) is provided at the bottom end of the return air baffle (17). A through hole is provided in the middle of the vertical plate (1701). And a return air channel (18) is provided at the back of the vertical plate (1701) at the through hole. A return air valve (16). The return air valve (16) is inserted and connected to one end of the return air baffle (17) and located at the air inlet end of the return air and supply air box (6).

8. The return air reheating type fan coil unit according to claim 7, characterized in that, A plurality of baffles (1601) are arranged in the middle of the return air valve (16), and a rotating support rod (1602) is inserted and connected in the middle of each of the baffles (1601). The two ends of the rotating support rods (1602) are respectively rotated and inserted and connected to the two walls of the return air valve (16). A wind shield (1901) is arranged in the through opening, and a control rotating rod (19) is inserted and connected in the middle of the wind shield (1901). The top of the control rotating rod (19) extends through and extends to the top of the return air baffle (17). A linkage mechanism is arranged between one end of the plurality of rotating support rods (1602) close to the vertical plate (1701) and the top of the control rotating rod (19). The linkage mechanism is arranged in the middle of the return air baffle (17), and the linkage mechanism is used to synchronously control the setting angles of the plurality of baffles (1601) of the wind shield (1901).

9. The return air reheating type fan coil unit according to claim 8, wherein, The linkage mechanism includes a control member and a transmission member; The control member comprises a bevel gear with different teeth (21) and a bevel gear with full teeth (22), wherein the bevel gear with different teeth (21) is sleeved on the top of the control rotating rod (19), and the tooth side of the bevel gear with different teeth (21) and the tooth side of the bevel gear with full teeth (22) are meshed with each other; The transmission member comprises a rotating sprocket (1603) and a transmission chain (20); the plurality of rotating sprockets (1603) are respectively sleeved on the ends of the plurality of rotating support rods (1602); and the transmission chain (20) is meshedly sleeved on the outer walls of the plurality of rotating sprockets (1603).

10. The return air reheating type fan coil unit according to claim 9, characterized in that, A transmission rod (23) is inserted and connected in the middle of the full-tooth bevel gear (22); a shifting sprocket (24) is sleeved on one end of the transmission rod (23) away from the full-tooth bevel gear (22); and the shifting sprocket (24) is meshed with the outer ring wall of the transmission chain (20); and the tooth side of the heterogeneous bevel gear (21) occupies one third of the area of its outer ring wall.

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