Water chilling unit for heating ventilation air conditioner

Abstract

The invention discloses a water chilling unit for a heating ventilation air conditioner, and relates to the technical field of water chilling units, the water chilling unit comprises an evaporator and a condenser, a compressor is fixedly mounted between the evaporator and the condenser, a heat regenerator is fixedly mounted between the evaporator and the compressor, and the water chilling unit further comprises a flow slowing mechanism; the flow slowing mechanism comprises a connecting pipe fixedly connected between the evaporator and the compressor, an inner pipe is rotationally connected into the connecting pipe, and a mounting ring is fixedly connected to the inner wall of the inner pipe. When the flow of a refrigerant in the evaporator is suddenly increased, the blade plates are bent, the refrigerant passing through the inner pipe is blocked, the flow speed of the refrigerant is slowed down, and the flow speed of the refrigerant is increased; and when the flow of the refrigerant in the evaporator is suddenly reduced, one side of the bottom end of the blade plate is tilted, so that the driving unit drives the blade plate to rotate to push the refrigerant to flow towards the compressor, the effect of temporarily delaying the sudden pressure drop is achieved, and the surge of the centrifugal compressor is effectively inhibited.

Description

Technical Field

[0001] The present invention relates to the technical field of chillers, and particularly to a chiller for heating, ventilation and air conditioning (HVAC). Background Art

[0002] Heating, ventilation and air conditioning (HVAC), the English abbreviation of Heating, Ventilation and Air Conditioning, is a system that integrates heating, ventilation and air conditioning functions. In winter, it provides warmth through a heat source system such as a boiler or a heat pump; in summer, it relies on a cold source system such as a chiller to achieve refrigeration and cooling; the ventilation system continuously renews the indoor air through equipment such as fans and air ducts to keep it fresh; at the same time, air handling equipment and air conditioning terminal devices are used to precisely control the air to achieve operations such as cooling, heating, humidifying and dehumidifying, creating a comfortable and healthy environment for people and ensuring the smooth progress of production and life.

[0003] HVAC needs to use a chiller to achieve refrigeration and cooling in summer. A chiller usually consists of main components such as a compressor, a condenser, an evaporator, a throttling device and a control system. The principle is that the compressor compresses the refrigerant gas into a high-temperature and high-pressure state, and then enters the condenser. In the condenser, the refrigerant gas cools and condenses into a liquid, releasing heat. The liquid refrigerant enters the evaporator after being depressurized by the throttling device, and absorbs heat and evaporates in the evaporator, reducing the temperature of the water in the evaporator and achieving water refrigeration.

[0004] In places such as factory workshops and data centers, there are usually a large number of devices running. During the operation of the devices, a large amount of heat is dissipated. If the devices are suddenly turned on or off, it will cause an instantaneous change in the indoor heat load, resulting in a sudden large increase or decrease in the refrigeration load of the chiller. At this time, the refrigerant vapor flow rate at the outlet of the evaporator will change suddenly, causing the compressor to be overloaded or surge, damaging the internal components of the compressor and shortening the service life of the compressor. Summary of the Invention

[0005] The purpose of the present invention is to provide a chiller for HVAC to solve the problem that when the heat load of HVAC suddenly changes greatly, the refrigeration load of the chiller will suddenly increase or decrease greatly, causing the refrigerant vapor flow rate at the outlet of the evaporator to change suddenly, resulting in compressor overload or surge and damaging the internal components of the compressor.

[0006] To achieve the above purpose, the present invention adopts the following technical solution: A chiller for HVAC, comprising an evaporator and a condenser, a compressor is fixedly installed between the evaporator and the condenser, a regenerator is fixedly installed between the evaporator and the compressor, and further includes:

[0007] A slow flow mechanism, the slow flow mechanism comprising a connecting pipe fixedly connected between the evaporator and the compressor, an inner pipe rotatably connected inside the connecting pipe, a mounting ring fixedly connected to the inner wall of the inner pipe, a plurality of blades equidistantly arranged around the circumference fixed to the inner wall of the mounting ring, a bending unit provided at the bottom of the inner pipe, a push bending assembly provided inside the inner pipe, and a driving unit installed outside the inner pipe;

[0008] When the blade is bent as a whole, the refrigerant flowing through the inner tube is blocked and buffered; when the bottom end of the blade is tilted, the driving unit drives the blade to rotate and promote the flow of the refrigerant.

[0009] As a further description of the above scheme: the bending unit includes an iron ring slidably connected to the inside of the inner tube, the inner wall of the iron ring is fixedly connected to a plurality of pressure plates, a cylinder is fixedly installed on the top of the evaporator, and an electromagnet is fixed to the telescopic end of the cylinder.

[0010] As a further description of the above scheme: the push-bending assembly includes a first pull rod fixed to the top of the iron ring, the inner wall of the inner tube is slidably connected to the second pull rod, the inside of the mounting ring is rotatably connected to the mounting ring, the outside of the mounting ring is fixed with an inclined block, and the inside of the inclined block is fixed with a triangular plate that passes through the second pull rod.

[0011] As a further description of the above solution: the driving unit includes a motor fixedly mounted on the evaporator, and a transmission belt is connected between the motor and the inner tube.

[0012] As a further description of the above solution: the second pull rod is embedded in the inner wall of the inner tube, a slide groove is provided on one side of the second pull rod, and a protrusion embedded in the top of the slide groove is provided on one side of the first pull rod.

[0013] As a further description of the above solution: it also includes an auxiliary unit, a baffle is arranged on the pressure plate, and a stop groove is opened on the side of the baffle close to the blade.

[0014] As a further description of the above solution: the top of the baffle is rotatably connected to a slider which is slidably connected to the driving unit.

[0015] As a further description of the above solution: a torsion spring is provided between the sliding block and the baffle, and a baffle for limiting the unidirectional rotation of the baffle is provided on the top of the baffle.

[0016] In summary, due to the adoption of the above-mentioned technology, a chiller for HVAC has the following beneficial effects:

[0017] When the refrigerant flow rate inside the evaporator suddenly increases, the leaf plate is bent by the bending unit to block the refrigerant passing through the inner tube, slowing down the flow rate of the refrigerant, thereby preventing the compressor from being overloaded due to a sudden increase in the intake air volume, achieving the purpose of protecting the compressor, extending the service life of the compressor, and the bending degree of the leaf plate is controllable, enabling the blocking and buffering effect of the leaf plate to be adaptively adjusted according to the change of the refrigerant flow rate, contributing to the precise control of the refrigerant flow rate and improving the usage effect of the compressor.

[0018] When the refrigerant flow rate inside the evaporator suddenly decreases, one side of the bottom end of the leaf plate is lifted by the pushing and bending assembly, and the driving unit drives the leaf plate to rotate to push the refrigerant to flow towards the compressor, playing a role in temporarily delaying the sudden drop in pressure, effectively suppressing the surge of the centrifugal compressor, and preventing the compressor from over-compressing the gas due to too low suction pressure, resulting in too high exhaust temperature, thereby avoiding lubrication failure or component damage.

[0019] Driving the leaf plate and the pressing plate to rotate by the driving unit can also cause the liquid refrigerant passing through the inner tube to be thrown towards the inner wall of the inner tube under the action of centrifugal force, thereby helping the regenerator to completely evaporate the refrigerant, avoiding the liquid slugging accident caused by the compressor sucking liquid refrigerant, ensuring the safe operation of the compressor. Moreover, when the refrigerant flow rate in the evaporator suddenly increases, the high-velocity refrigerant will carry more unevaporated refrigerant to flow towards the compressor. At this time, the leaf plate rotates in the bent state, and can also enhance the separation effect of the liquid refrigerant and improve the anti-liquid slugging ability.

[0020] When the leaf plate is bent to block and buffer the refrigerant, it can also play a guiding role, making the refrigerant flow towards the baffle, causing the residual liquid refrigerant to impact the baffle under inertia, further improving the separation effect of the liquid refrigerant. In addition, the greater the bending degree of the leaf plate, the larger the included angle between the air flow direction and the baffle, and the easier the liquid refrigerant is to impact and adhere to the baffle under inertia, fully promoting the separation of the liquid refrigerant so that the refrigerant can be completely evaporated and improving the operation effect of the water chiller. Description of the Drawings

[0021] Figure 1 Shows the overall schematic diagram provided by an embodiment of the present invention;

[0022] Figure 2 Shows the one provided by an embodiment of the present invention Figure 1 Enlarged view at A in;

[0023] Figure 3 Shows the cross-sectional view of the connecting pipe provided by an embodiment of the present invention;

[0024] Figure 4 Shows the installation schematic diagram of the leaf plate provided by an embodiment of the present invention;

[0025] Figure 5 shows the enlarged view at position B in Figure 4 ;

[0026] Figure 6 shows a schematic diagram of a bending assembly provided according to an embodiment of the present invention;

[0027] Figure 7 shows a sectional view of a mounting ring provided according to an embodiment of the present invention;

[0028] Figure 8 shows an exploded view of an auxiliary unit provided according to an embodiment of the present invention;

[0029] Figure 9 shows a first state diagram of a blade provided according to an embodiment of the present invention;

[0030] Figure 10 shows a second state diagram of a blade provided according to an embodiment of the present invention.

[0031] Legend description:

[0032] 10. Evaporator; 11. Compressor; 12. Condenser; 13. Regenerator;

[0033] 20. Flow buffer mechanism; 21. Connecting pipe; 22. Inner pipe; 23. Mounting ring; 24. Blade; 25. Pressing and bending unit; 251. Iron ring; 252. Pressing plate; 253. Electromagnet; 254. Cylinder; 26. Driving unit; 261. Motor; 262. Transmission belt;

[0034] 30. Pushing and bending assembly; 31. First pull rod; 32. Second pull rod; 33. Inclined block; 34. Mounting ring; 35. Triangular plate;

[0035] 40. Auxiliary unit; 41. Slide block; 42. Baffle; 43. Torsion spring. Detailed implementation manners

[0036] Next, the technical solution of a chilled water unit for a heating, ventilation and air conditioning system in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] As Figures 1 - 10As shown in the figure, a chiller for heating, ventilation, and air conditioning provided by the present invention includes an evaporator 10 and a condenser 12. A compressor 11 is fixedly installed between the evaporator 10 and the condenser 12. Heat exchange tubes are arranged inside both the evaporator 10 and the condenser 12. The refrigerant inside the evaporator 10 evaporates and absorbs heat, cooling the water inside the heat exchange tubes to provide a cold source for the heating, ventilation, and air conditioning. The evaporated refrigerant enters the condenser 12 after being compressed by the compressor 11. The condenser 12 cools the compressed high-temperature and high-pressure refrigerant through the cooling water in the heat exchange tubes, enabling the refrigerant to be recycled. A regenerator 13 for heating the refrigerant is fixedly installed between the evaporator 10 and the compressor 11 to ensure that the refrigerant flowing out of the evaporator 10 and entering the compressor 11 is superheated steam, preventing liquid refrigerant from entering the compressor 11 and avoiding liquid hammer phenomenon in the compressor 11, thus protecting the safe operation of the compressor 11.

[0038] Referring to Figure 2 , Figure 3 and Figure 4 , in order to avoid rapid evaporation of the refrigerant inside the evaporator 10 caused by a sudden large increase in the heating, ventilation, and air conditioning heat load, resulting in overload shutdown of the compressor 11, a flow buffering mechanism 20 is provided on the pipeline connecting the evaporator 10 and the compressor 11. The flow buffering mechanism 20 includes a connecting pipe 21 fixedly connected between the air outlet pipe of the evaporator 10 and the air inlet pipe of the compressor 11. An inner pipe 22 is rotatably connected inside the connecting pipe 21. A sealing ring is provided between the connecting pipe 21 and the inner pipe 22 to prevent refrigerant from leaking from the rotating connection between the two. An installation ring 23 is fixedly connected to the inner wall of the inner pipe 22. A plurality of vane plates 24 are fixedly arranged on the inner wall of the installation ring 23 at equal circumferential intervals. The side of the vane plate 24 away from the installation ring 23 is concave, making it easy for the vane plate 24 in the vertical state to bend away from the installation ring 23, and it is difficult for the vane plate 24 to bend towards the installation ring 23 under the action of centrifugal force when rotating;

[0039] A bending unit 25 is provided at the bottom of the inner pipe 22. The bending unit 25 includes an iron ring 251 slidably connected inside the inner pipe 22. A plurality of pressing plates 252 are fixedly connected to the inner wall of the iron ring 251. The number of pressing plates 252 is the same as that of the vane plates 24 and they correspond one by one. The bottom end of the pressing plate 252 is inclined. When the pressing plate 252 moves downward, it can push the top end of the vane plate 24 away from the installation ring 23, causing the vane plate 24 to bend. When a plurality of vane plates 24 bend towards the middle of the inner pipe 22, the range available for the refrigerant to pass through in the inner pipe 22 can be reduced. When the refrigerant flow rate inside the evaporator 10 suddenly increases, the vane plates 24 block the refrigerant passing through the inner pipe 22, slowing down the refrigerant flow rate, thereby avoiding overload of the compressor 11 due to a sudden increase in the intake air volume; among them, the greater the downward pressing distance of the pressing plate 252, the greater the bending degree of the vane plate 24, so as to control the bending degree of the vane plate 24 and accurately control the refrigerant flow rate;

[0040] A cylinder 254 is fixedly installed on the top of the evaporator 10, and an electromagnet 253 is fixed to the telescopic end of the cylinder 254. The electromagnet 253 attracts the iron ring 251 through magnetic force, so that when the heat regenerator 13 is telescoped to drive the electromagnet 253 to rise and fall, the iron ring 251 can be driven to rise and fall through the magnetic attraction force to adjust the height of the pressure plate 252.

[0041] Reference Figure 2 In order to make the blade 24 block the refrigerant evenly and separate the unevaporated refrigerant in the airflow by driving the refrigerant to rotate, a driving unit 26 is installed on the outside of the inner tube 22. The driving unit 26 includes a motor 261 fixedly installed on the evaporator 10. A transmission belt 262 is connected between the motor 261 and the inner tube 22. The motor 261 is started to drive the inner tube 22 to rotate through the transmission belt 262, which can drive the mounting ring 23, the blade 24, the iron ring 251 and the pressure plate 252 to rotate. The rotation of the blade 24 and the pressure plate 252 drives the refrigerant passing through the inner tube 22 to rotate, and the unevaporated liquid refrigerant is thrown out to the inner wall of the inner tube 22 by centrifugal force, so as to prevent the liquid refrigerant from entering the compressor 11 and causing liquid hammer.

[0042] Reference Figures 4 - 7 , when the centrifugal compressor 11 is under low flow and high pressure ratio conditions, the gas will separate from the impeller flow channel, causing the air flow to flow back periodically, causing severe vibration and noise, and causing surge. In order to avoid the sudden reduction of the heat load of the HVAC, which causes the refrigerant evaporation amount in the evaporator 10 to drop suddenly, causing the compressor 11 to surge, a push-bend assembly 30 is arranged inside the inner tube 22, and the push-bend assembly 30 includes a first tie rod 31 fixed to the top of the iron ring 251, and the inner wall of the inner tube 22 is slidably connected to the second tie rod 32, and the second tie rod 32 is embedded in the inner wall of the inner tube 22 to keep the inner wall surface of the inner tube 22 flat, so that the regenerator 13 can evenly transfer heat to the inner wall of the inner tube 22, so that the liquid refrigerant on the inner wall of the inner tube 22 evaporates evenly, and the mounting ring 23 is rotatably connected to the mounting ring 34, and the outer side of the mounting ring 34 is fixed with an inclined block 33, and the inside of the inclined block 33 is fixed with a triangular plate 35 that passes through the second tie rod 32;

[0043] When the iron ring 251 drives the first pull rod 31 to move upward, the first pull rod 31 pulls up the second pull rod 32, and the bottom end of the second pull rod 32 pushes the inclined block 33, driving the mounting ring 34 and the triangular plate 35 to rotate, so that the triangular plate 35 pushes a corner of the bottom end of the vane 24 outward, so that the bottom end of the vane 24 tilts up. At this time, the driving unit 26 drives the vane 24 to rotate, which can push the refrigerant to flow to the compressor 11, playing a role in temporarily delaying the sudden drop in pressure, and effectively suppressing the surge of the centrifugal compressor 11;

[0044] A chute is provided on one side of the second pull rod 32, and a protrusion is provided on one side of the first pull rod 31 and is embedded at the top of the chute, so that the first pull rod 31 can only pull the second pull rod 32 when moving upward. Through the transmission of other components, the bottom end of the blade 24 is lifted. When the first pull rod 31 moves downward with the iron ring 251, it will not drive the second pull rod 32 to move.

[0045] Referring to Figure 8 , in order to further improve the separation effect of the liquid refrigerant in the refrigerant gas flow when the refrigerant flow rate suddenly increases, an auxiliary unit 40 is further included. A baffle 42 is provided on the pressing plate 252. When the refrigerant guided by the blade 24 impacts on the baffle 42, the unseparated liquid refrigerant in the refrigerant gas flow contacts the baffle 42 under inertia and adheres to the baffle 42, realizing the further separation of the liquid refrigerant. A flow stop groove is provided on one side of the baffle 42 close to the blade 24 to prevent the gas flow from pushing the liquid refrigerant upward and mixing the liquid refrigerant into the gas flow again. A slider 41 that is rotationally connected to the top of the baffle 42 and slidably connected to the pressing plate 252 is provided. When the blade 24 bends, it pushes the baffle 42 to drive the slider 41 to slide on the pressing plate 252, so that the blade 24 is always at the top of the blade 24;

[0046] A torsion spring 43 is provided between the slider 41 and the baffle 42. A retaining piece for restricting the one-way rotation of the baffle 42 is provided at the top of the baffle 42. The torsion spring 43 is always in a compressed state. The baffle 42 is attached to the slider 41 under the elastic force of the torsion spring 43. The purpose of this design is to prevent the baffle 42 from shaking when the pressing plate 252 is in a rotating state. And when the blade 24 bends, when the slider 41 is pushed to the end of the pressing plate 252 and can no longer move, the blade 24 is continuously pressed and bent by the pressing plate 252, which will push the baffle 42 to deflect, making the baffle 42 closer to perpendicular to the gas flow direction, further improving the baffle 42's blocking of the gas flow and separating the liquid refrigerant in the gas flow by the principle of inertia.

[0047] Working principle: When the refrigerant flow rate in the evaporator 10 suddenly increases, the refrigerant accelerates into the inner tube 22. At this time, the control regenerator 13 shortens and drives the electromagnet 253 to move downward. The electromagnet 253 drives the iron ring 251 to move downward through magnetic attraction, driving the pressing plate 252 to move downward and pushing the top end of the blade 24 away from the mounting ring 23, causing the blade 24 to bend and blocking the refrigerant gas flow to achieve a buffering effect and prevent the compressor 11 from being overloaded;

[0048] At this time, the flow rate of the refrigerant gas stream increases, which will carry more unevaporated refrigerant to flow. The starting motor 261 drives the inner tube 22 to rotate through the transmission belt 262. The inner tube 22 drives the iron ring 251, the pressing plate 252, the mounting ring 23 and the vane 24 to rotate. The rotation of the pressing plate 252 and the vane 24 drives the refrigerant to rotate, so that the unevaporated liquid refrigerant in the refrigerant is thrown out onto the inner wall of the inner tube 22 under the action of centrifugal force, avoiding the liquid refrigerant from entering the compressor 11 and causing liquid hammer. During this process, in order to avoid further increase in the refrigerant flow rate, the regenerator 13 is in a closed state;

[0049] Refer to Figure 9 , after the refrigerant guided by the vane 24 impacts on the baffle 42, the unseparated liquid refrigerant in the refrigerant gas stream contacts the baffle 42 under inertia and adheres to the baffle 42, realizing the further separation of the liquid refrigerant. The bending of the vane 24 will push the baffle 42 to drive the slider 41 to slide on the pressing plate 252. When the slider 41 is pushed to the end of the pressing plate 252 and can no longer move, the further downward bending of the vane 24 by the pressing plate 252 will push the baffle 42 to deflect, making the baffle 42 closer to perpendicular to the gas flow direction, further improving the effect of the baffle 42 blocking the gas flow and separating the liquid refrigerant in the gas flow;

[0050] Refer to Figure 10 , when the refrigerant flow rate in the evaporator 10 suddenly decreases, the control cylinder 254 extends to drive the electromagnet 253 to move upward. The electromagnet 253 drives the iron ring 251 to move upward through magnetic attraction. When the iron ring 251 drives the first pull rod 31 to move upward, the first pull rod 31 pulls the second pull rod 32 upward. The bottom end of the second pull rod 32 pushes the inclined block 33, driving the mounting ring 34 and the triangular plate 35 to rotate, so that the triangular plate 35 pushes the bottom corner of the vane 24 outward, making the bottom end of the vane 24 tilt up. At this time, driving the vane 24 to rotate through the driving unit 26 can push the refrigerant to flow towards the compressor 11, playing a role in temporarily delaying the sudden drop in pressure and effectively suppressing the surging of the centrifugal compressor 11. At this time, the rotation of the pressing plate 252 and the vane 24 can still separate the liquid refrigerant by centrifugal force. After the refrigerant is thrown out onto the inner wall of the inner tube 22, the regenerator 13 slightly heats the refrigerant to promote the evaporation of the refrigerant and further suppress the decrease in the refrigerant pressure.

[0051] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A chiller for heating, ventilation and air conditioning, comprising an evaporator (10) and a condenser (12), a compressor (11) is fixedly installed between the evaporator (10) and the condenser (12), and a regenerator (13) is fixedly installed between the evaporator (10) and the compressor (11), characterized in that, Also includes: A slow flow mechanism (20), the slow flow mechanism (20) comprising a connecting pipe (21) fixedly connected between the evaporator (10) and the compressor (11), the connecting pipe (21) being rotatably connected to an inner pipe (22), the inner wall of the inner pipe (22) being fixedly connected to a mounting ring (23), the inner wall of the mounting ring (23) being fixed with a plurality of blades (24) equidistantly arranged around the circumference, a bending unit (25) being arranged at the bottom of the inner pipe (22), a push bending assembly (30) being arranged inside the inner pipe (22), and a driving unit (26) being installed outside the inner pipe (22); When the blade (24) is in an overall bent state, the refrigerant flowing through the inner tube (22) is blocked and buffered; when the bottom end of the blade (24) is in a tilted state, the drive unit (26) drives the blade (24) to rotate and promote the flow of the refrigerant.

2. The chiller for heating, ventilation and air conditioning according to claim 1, characterized in that, The bending unit (25) comprises an iron ring (251) slidably connected to the inside of the inner tube (22); a plurality of pressure plates (252) are fixedly connected to the inner wall of the iron ring (251); a cylinder (254) is fixedly installed on the top of the evaporator (10); and an electromagnet (253) is fixed to the telescopic end of the cylinder (254).

3. The water chiller for heating, ventilation and air conditioning according to claim 2, characterized in that, The push-bending assembly (30) includes a first pull rod (31) fixed to the top of the iron ring (251), the inner wall of the inner tube (22) is slidably connected to the second pull rod (32), the interior of the mounting ring (23) is rotatably connected to the mounting ring (34), the outer side of the mounting ring (34) is fixed with an inclined block (33), and the interior of the inclined block (33) is fixed with a triangular plate (35) that passes through the second pull rod (32).

4. The chiller for heating, ventilation and air conditioning according to claim 1, characterized in that, The driving unit (26) comprises a motor (261) fixedly mounted on the evaporator (10), and a transmission belt (262) is connected between the motor (261) and the inner tube (22).

5. The chiller for heating, ventilation and air conditioning according to claim 2, wherein, The second pull rod (32) is embedded in the inner wall of the inner tube (22), a slide groove is provided on one side of the second pull rod (32), and a protrusion embedded in the top of the slide groove is provided on one side of the first pull rod (31).

6. The chiller for heating, ventilation and air conditioning according to claim 2, wherein, It also includes an auxiliary unit (40), wherein a baffle (42) is provided on the pressure plate (252), and a flow-stop groove is provided on a side of the baffle (42) close to the blade plate (24).

7. A chiller for heating, ventilation and air conditioning according to claim 6, characterized in that, The top of the baffle (42) is rotatably connected to a slider (41) which is slidably connected to the drive unit (26).

8. A chilled water unit for heating, ventilation and air conditioning according to claim 7, characterized in that, A torsion spring (43) is provided between the slider (41) and the baffle (42), and a baffle plate for limiting the unidirectional rotation of the baffle (42) is provided on the top of the baffle (42).

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