Variable air volume terminal device capable of automatically switching control and control method of variable air volume terminal device

Abstract

The invention discloses a variable air volume terminal device capable of automatically switching control and a control method thereof, and relates to the technical field of variable air volume terminal equipment, the variable air volume terminal device comprises a terminal mechanism, and the terminal mechanism comprises a shell, an assembly shell, an air inlet connecting pipe, an air outlet connecting pipe, a fan, a control assembly and an air valve driver. Related data in the shell are monitored in real time through the temperature probe and the sensor, the microprocessor receives data collected by the temperature probe and the sensor set, and the controller sends a control instruction to the control assembly according to a preset control algorithm, so that the air duct resistance is adjusted, and the air supply amount is controlled; a switching judgment module in the controller judges the air inlet temperature of the tail end mechanism according to temperature data of the temperature probe, automatic switching control modes of the variable air volume tail end device are achieved, the device can achieve flexible automatic switching control mechanisms, efficient switching between different control modes is achieved according to actual requirements, and the control efficiency is improved. The overall performance of the air-conditioning ventilation system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of variable air volume terminal equipment, and in particular to a variable air volume terminal device capable of automatic switching control and a control method thereof. Background Art

[0002] In the air conditioning and ventilation systems of modern buildings, variable air volume terminal devices play a key role in adjusting the air supply to meet the load requirements of different areas. The variable air volume system of the variable air volume terminal device is a full air conditioning system that uses changes in the air supply into the room to achieve indoor temperature regulation. Its air supply state remains unchanged, and the air supply volume is changed to adapt to changes in air conditioning load to maintain the air parameters of the air-conditioned room. At present, affected by the international environment, the chip industry is highly competitive, and the technical blockade of precision components is unbreakable. If the use of precision components is saved, the cost of the enterprise can be greatly reduced. More importantly, it responds to the national policy of energy conservation and emission reduction.

[0003] For example, the Chinese patent CN217274764U, "A terminal variable air volume device for five-constant air conditioners", is provided with an electric control box on one side of the equipment box, and the top of the electric control box is symmetrically connected to an air outlet duct, an air volume adjustment component is provided inside the air outlet duct, and the air volume adjustment component includes a central connecting block, a central connecting block is provided inside the air outlet duct, a support rod is fixedly connected to the top of the central connecting block, one end of the support rod is fixedly connected to the inner wall of the air outlet duct, a plurality of fan blades are movably connected to the inner wall of the air outlet duct through a bearing, and a disc 1, a turntable and a disc 2 are provided on the outer side of the air outlet duct.

[0004] The temperature control panel of a traditional variable air volume terminal device is usually provided with a mode selection button, which adopts a single control method. The three control modes of "cooling, ventilation, and heating" can be selected through the button. However, the control method of multiple buttons increases the design size of the temperature control panel, and at the same time increases the use of processing materials and precision components, increasing production costs. At the same time, the existing variable air volume terminal devices lack a flexible automatic switching control mechanism when facing different usage scenarios, and cannot efficiently switch between different control modes according to actual needs, thereby limiting the improvement of the overall performance of the air conditioning and ventilation system and the effective reduction of energy consumption. In addition, in an environment with poor air quality, dust can easily enter the variable air volume terminal device, resulting in the inability of the air valve to rotate flexibly. At the same time, when the airflow passes through the air duct, noise is generated due to changes in flow velocity, airflow impact and friction, which affects the use effect of the air conditioning system. In view of the above problems, a variable air volume terminal device that can automatically switch control is proposed. Summary of the invention

[0005] The object of the present invention is to provide a variable air volume terminal device that can be automatically switched and controlled to solve the problems raised by the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a variable air volume terminal device that can be automatically switched and controlled, comprising a terminal mechanism, the terminal mechanism comprising an outer shell, an assembly shell, an air inlet connecting pipe, an air outlet connecting pipe, a fan, a control component and an air valve driver, a fixing ring is rotatably installed inside the outer shell, and the inner edge of the fixing ring is fixedly connected to a valve plate, the outer edge of the fixing ring is fixedly connected to a sound-absorbing felt, a wind tube assembly is fixedly installed on the inner wall of one end of the outer shell, the wind tube assembly comprises a silencer wind tube, the inner wall of one end of the silencer wind tube is fixedly connected to a dustproof net, and the inner wall of the other end of the silencer wind tube is evenly fixedly connected to a plurality of guide plates, the inner wall of the silencer wind tube is bonded with a porous sound-absorbing pad, a sound insulation board 1 is fixedly connected to the inside of the outer shell, and a sound insulation board 2 is fixedly connected to the outer side of the sound insulation board 1, and the sound insulation board A sound-absorbing filler is filled between the first and second sound insulation boards, sound-absorbing rings are symmetrically fixedly connected at both ends of the second sound insulation board, an automatic switching mechanism is fixedly installed on the outside of the shell, the automatic switching mechanism includes a protective shell, a controller, a microprocessor and an air volume sensor, an inner sleeve plate is fixedly connected to the inside of the protective shell, and the inner edge of the inner sleeve plate is fixedly connected to the outer edge of the shell, a temperature probe is fixedly connected to the top wall of one end of the protective shell, a pressure sensor one is fixedly connected to the bottom wall of one end of the protective shell, and a pressure sensor two is fixedly connected to the bottom wall of the other end of the protective shell, one end of the temperature probe, the air volume sensor, the pressure sensor one and the pressure sensor two all extend into the inside of the shell, the temperature probe, the air volume sensor, the pressure sensor one and the pressure sensor two are all electrically connected to the microprocessor, and the controller is electrically connected to the control component.

[0007] Preferably, sound insulation filler is filled between the protective shell and the inner plate, the bottom end of the controller is fixedly mounted to the top end of the protective shell, and the microprocessor is fixedly mounted at the bottom of the controller.

[0008] Preferably, the fan is fixedly mounted inside the outer shell, and the bottom end of the assembly shell is fixedly mounted to the top of the outer shell.

[0009] Preferably, the control assembly is fixedly mounted inside the top end of the assembly shell, and the air valve driver is fixedly mounted inside the bottom end of the assembly shell.

[0010] Preferably, a connecting rod is provided at the bottom output end of the air valve driver, and the bottom end of the connecting rod passes through the outer shell and is fixedly connected to the top of the fixing ring.

[0011] Preferably, one end of the shell is welded to one end of the air inlet connecting pipe, and the other end of the shell is welded to one end of the air outlet connecting pipe, a connecting flange 1 is welded to the outer wall of one end of the air inlet connecting pipe, and a connecting flange 2 is welded to the outer side of one end of the air outlet connecting pipe.

[0012] Preferably, a mounting frame is welded to the bottom of the protective shell, one end of the air inlet connecting pipe is fixedly connected to the air inlet pipe, and one end of the air outlet connecting pipe is fixedly connected to the air outlet pipe.

[0013] Preferably, a room temperature regulator is provided at one end of the air outlet duct, a blower is provided at one end of the air inlet duct, one end of the blower is fixedly connected to a processing unit, a frequency converter is provided inside the processing unit, a refrigerant water valve is provided at one end of the inner wall of the processing unit, and a heat medium water valve is provided at the other end of the inner wall of the processing unit.

[0014] A control method for a variable air volume terminal device capable of automatic switching control comprises the following steps: S1. In the variable air volume air conditioning system, the blower delivers cold air or hot air to the terminal mechanism through the air inlet pipe, and then delivers it to the room through the air outlet pipe. The terminal mechanism and the automatic switching mechanism are controlled by the command of the room temperature regulator, and the air supply volume is automatically adjusted according to the room temperature. On the one hand, the processing unit can control the blower, calculate the required air volume of the terminal mechanism or the static pressure change of the terminal through the automatic switching mechanism, control the frequency change of the inverter, and thus adjust the air supply volume of the processing unit. On the other hand, the processing unit can control the opening of the refrigerant water valve and the heat medium water valve, thereby controlling the outlet air temperature of the processing unit; S2, monitor the air supply temperature in real time through the temperature probe, measure the air supply volume in the housing in real time through the air volume sensor, detect the pressure of the air inlet in real time through the pressure sensor 1, and detect the pressure of the air outlet in real time through the pressure sensor 2. The microprocessor receives the collected data of the temperature probe and the sensor group and transmits the data to the controller; S3. The controller sends a control instruction to the control component according to the preset control algorithm. The control component controls the start and stop of the air valve driver. The air valve driver can drive the fixed ring and the valve plate to flip through the connecting rod, thereby adjusting the air duct resistance and controlling the air supply volume. The fan can assist in adjusting the air supply volume under specific working conditions. S4. The switching judgment module in the controller is connected to the control unit in the processing unit. The switching judgment module judges the inlet air temperature of the terminal mechanism according to the temperature data of the temperature probe. When the inlet air temperature is less than 20°C, it is automatically determined to be in cooling mode. When the inlet air temperature is greater than 25°C, it is automatically determined to be in heating mode. When 20°C≤inlet air temperature≤25°C, it is automatically determined to be in ventilation mode to maintain the minimum air volume of the design working condition. S5, the switching judgment module comprehensively considers the data of the temperature probe, pressure sensor 1, pressure sensor 2 and air volume sensor, and accurately controls the air supply volume by adjusting the valve plate opening and the fan speed.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the temperature probe is used to monitor the supply air temperature in real time, the air volume sensor is used to monitor the supply air volume in the shell in real time, and the pressure sensor is used to detect the pressure change in the air duct in real time. The microprocessor receives the collected data of the temperature probe and the sensor group, and transmits the data to the controller. The controller issues a control instruction to the control component according to a preset control algorithm, thereby adjusting the air duct resistance and controlling the supply air volume. The switching judgment module in the controller is connected to the control unit in the processing unit. The switching judgment module judges the inlet air temperature of the terminal mechanism according to the temperature data of the temperature probe, and realizes the automatic switching control mode of the variable air volume terminal device. The device can realize a flexible automatic switching control mechanism, and efficiently switch between different control modes according to actual needs, thereby improving the overall performance of the air conditioning and ventilation system while reducing energy consumption.

[0016] 2. In the present invention, by adding an air duct assembly, the dustproof net can prevent dust from entering the outer shell and the air valve. At the same time, sound-absorbing felt is added to the outer edge of the fixed ring to reduce the friction between the valve plate and the inner wall of the outer shell, and reduce the noise of the valve plate when it is flipped. At the same time, the silencer air duct is made of porous sound-absorbing material, and the multiple guide plates inside can guide the airflow to pass smoothly, reduce the noise caused by airflow impact and turbulence, and at the same time help to improve ventilation efficiency and reduce energy consumption.

[0017] 3. In the present invention, by adding sound insulation board 1, sound insulation board 2 and sound absorbing ring in the shell, a closed sound insulation cavity is formed between the sound insulation board 1 and the sound insulation board 2, and the sound insulation cavity is filled with sound absorbing filler. The sound insulation board 1 is made of metal material with certain strength and sound insulation performance, and the sound insulation board 2 is made of composite material with excellent sound insulation performance. At the same time, sound insulation filler is filled between the protective shell and the inner sleeve plate. The mechanism can effectively absorb the noise generated by the fan, the air valve driver and the valve plate during use, effectively reduce various noises generated during the operation of the device, and improve the comfort of the indoor environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of a variable air volume terminal device capable of automatic switching control according to the present invention; Figure 2 It is a schematic diagram of the overall structure of an automatic switching mechanism and a terminal mechanism of a variable air volume terminal device capable of automatic switching control according to the present invention; Figure 3 It is a top view structural schematic diagram of an automatic switching mechanism and a terminal mechanism of a variable air volume terminal device capable of automatic switching control according to the present invention; Figure 4 It is a top view structural schematic diagram of a terminal mechanism of a variable air volume terminal device capable of automatic switching control according to the present invention; Figure 5 It is a structural schematic diagram of an automatic switching mechanism of a variable air volume terminal device capable of automatic switching control according to the present invention; Figure 6 It is an overall front cross-sectional view of a variable air volume terminal device capable of automatic switching control according to the present invention; Figure 7 It is a front cross-sectional view of a terminal mechanism of a variable air volume terminal device capable of automatic switching control according to the present invention; Figure 8 The invention is a variable air volume terminal device capable of automatic switching control Figure 7 A magnified detail of the center A; Fig. 9 The present invention is a side sectional view of a variable air volume terminal device capable of automatic switching control.

[0019] In the figure: 1, terminal mechanism; 2, automatic switching mechanism; 3, processing unit; 4, air blower; 5, room temperature regulator; 6, frequency converter; 7, refrigerant water valve; 8, heat medium water valve; 9, air inlet pipe; 10, air outlet pipe; 11, shell; 12, assembly shell; 13, air inlet connecting pipe; 14, connecting flange 1; 15, air outlet connecting pipe; 16, connecting flange 2; 17, air cylinder assembly; 18, fan; 19, connecting rod; 110, sound absorbing ring; 111, control assembly; 112, air valve driver ; 113, sound insulation board one; 114, sound insulation board two; 115, sound-absorbing filler; 116, fixing ring; 117, valve plate; 118, sound-absorbing felt; 171, silencer air duct; 172, dustproof net; 173, porous sound-absorbing pad; 174, guide plate; 21, protective shell; 22, controller; 23, mounting bracket; 24, inner plate; 25, microprocessor; 26, temperature probe; 27, air volume sensor; 28, pressure sensor one; 29, pressure sensor two; 210, sound insulation filler. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Reference Figure 1 - Fig. 9As shown: A variable air volume terminal device that can be automatically switched and controlled includes a terminal mechanism 1, the terminal mechanism 1 includes a shell 11, an assembly shell 12, an air inlet connection pipe 13, an air outlet connection pipe 15, a fan 18, a control component 111 and a wind valve driver 112, a fixed ring 116 is rotatably installed inside the shell 11, and the inner edge of the fixed ring 116 is fixedly connected to a valve plate 117, and the outer edge of the fixed ring 116 is fixedly connected to a sound-absorbing felt 118, and an inner wall of one end of the shell 11 is fixedly installed with a wind tube component 17, and the wind tube component 17 includes a silencer wind tube 1 71, a dustproof net 172 is fixedly connected to the inner wall of one end of the silencer air duct 171, and a plurality of guide plates 174 are evenly fixedly connected to the inner wall of the other end of the silencer air duct 171, a porous sound-absorbing pad 173 is bonded to the inner wall of the silencer air duct 171, a sound insulation board 113 is fixedly connected to the inside of the housing 11, and a sound insulation board 2 114 is fixedly connected to the outside of the sound insulation board 113, and a sound-absorbing filler 115 is filled between the sound insulation board 113 and the sound insulation board 2 114, and sound-absorbing rings 110 are symmetrically fixedly connected to the two ends of the sound insulation board 2 114, and the fan 18 is fixedly installed The assembly shell 12 is mounted inside the housing 11, the bottom end of the assembly shell 12 is fixedly mounted on the top of the housing 11, the control assembly 111 is fixedly mounted inside the top of the assembly shell 12, the air valve driver 112 is fixedly mounted inside the bottom end of the assembly shell 12, and the bottom output end of the air valve driver 112 is provided with a connecting rod 19, the bottom end of the connecting rod 19 passes through the housing 11 and is fixedly connected to the top of the fixing ring 116, one end of the housing 11 is welded to one end of the air inlet connecting pipe 13, and the other end of the housing 11 is welded to one end of the air outlet connecting pipe 15, and one end of the air inlet connecting pipe 13 is welded to the top of the fixing ring 116. A connecting flange 14 is welded to the wall, and a connecting flange 2 16 is welded to the outer side of one end of the air outlet connecting pipe 15, one end of the air inlet connecting pipe 13 is fixedly connected to the air inlet pipe 9, one end of the air outlet connecting pipe 15 is fixedly connected to the air outlet pipe 10, one end of the air outlet pipe 10 is provided with a room temperature regulator 5, one end of the air inlet pipe 9 is provided with a blower 4, one end of the blower 4 is fixedly connected to the processing unit 3, a frequency converter 6 is provided inside the processing unit 3, a refrigerant water valve 7 is provided at one end of the inner wall of the processing unit 3, and a heat medium water valve 8 is provided at the other end of the inner wall of the processing unit 3.

[0022] In this embodiment, by adding an air cylinder assembly 17 inside the housing 11, the dustproof net 172 can prevent dust from entering the housing 11 and the air valve. At the same time, a sound-absorbing felt 118 is added to the outer edge of the fixing ring 116 outside the valve plate 117 to reduce the friction between the valve plate 117 and the inner wall of the housing 11, thereby reducing the noise of the valve plate 117 when turning over. At the same time, the muffler air cylinder 171 is made of porous sound-absorbing material, and a plurality of guide plates 174 are arranged inside. The guide plates 174 can guide the airflow to pass smoothly, reduce the noise caused by the impact of the airflow and turbulence, and help improve the ventilation efficiency and reduce energy consumption. The shell 11 adopts a double-layer structure. By adding a sound insulation board 113, a sound insulation board 114 and a sound absorbing ring 110 in the shell 11, a closed sound insulation cavity is formed between the sound insulation board 113 and the sound insulation board 114. The sound insulation cavity is filled with a sound absorbing filler 115. The sound insulation board 113 is made of a metal material with a certain strength and sound insulation performance. The sound insulation board 114 is made of a composite material with excellent sound insulation performance, such as glass fiber reinforced plastic, etc. The sound absorbing filler 115 is rock wool, glass wool, etc. The filling density of the sound absorbing filler 115 is optimized to achieve the best sound absorption effect. At the same time, a sound insulation filler 210 is filled between the protective shell 21 and the inner plate 24. The sound insulation filler 210 can be a mineral wool board, glass wool, polyurethane foam, polyester fiber cotton, sound insulation gypsum board, sound insulation felt, etc., so that the mechanism can effectively absorb the noise generated by the fan 18, the air valve driver 112 and the valve plate 117 during use, effectively reduce various noises generated during the operation of the device, and prevent the noise from propagating outward, thereby improving the comfort of the indoor environment, reducing the interference and impact of noise on personnel, and meeting the use requirements of places with higher noise requirements.

[0023] Embodiment 2: Figure 1 - Fig. 9 As shown, an automatic switching mechanism 2 is fixedly installed on the outer side of the shell 11, and the automatic switching mechanism 2 includes a protective shell 21, a controller 22, a microprocessor 25 and an air volume sensor 27. An inner plate 24 is fixedly connected to the inside of the protective shell 21, and the inner edge of the inner plate 24 is fixedly connected to the outer edge of the shell 11. A temperature probe 26 is fixedly connected to the top wall of one end of the protective shell 21, a pressure sensor 1 28 is fixedly connected to the bottom wall of one end of the protective shell 21, and a pressure sensor 29 is fixedly connected to the bottom wall of the other end of the protective shell 21. The temperature probe 26, the air volume sensor 27, the controller 22, the microprocessor 25 and the air volume sensor 27 are fixedly connected to the inner plate 24, and the inner edge of the inner plate 24 is fixedly connected to the outer edge of the shell 11. One end of the sensor 27, pressure sensor 1 28 and pressure sensor 2 29 all extend into the interior of the housing 11, the temperature probe 26, the air volume sensor 27, the pressure sensor 1 28 and the pressure sensor 2 29 are all electrically connected to the microprocessor 25, the controller 22 is electrically connected to the control component 111, the protective shell 21 and the inner plate 24 are filled with sound insulation filler 210, the bottom end of the controller 22 is fixedly installed on the top end of the protective shell 21, the microprocessor 25 is fixedly installed on the bottom of the controller 22, and a mounting frame 23 is welded to the bottom of the protective shell 21.

[0024] In this embodiment, a temperature probe 26 (NTC-10K temperature probe 26 can be selected) is installed in front of the air volume regulating valve (air valve driver 112) of the terminal mechanism 1. The temperature probe 26 monitors the air supply temperature in real time, the air volume sensor 27 measures the air supply volume in the housing 11 in real time, the pressure sensor 1 28 detects the pressure of the air inlet in real time, and the pressure sensor 2 29 detects the pressure of the air outlet in real time. The microprocessor 25 receives the collected data of the temperature probe 26 and the sensor group, and transmits the data to the controller 22; the controller 22 issues a control instruction to the control component 111 according to a preset control algorithm, and the control component 111 controls the start and stop of the air valve driver 112. The air valve driver 112 can drive the fixed ring 116 and the valve plate 117 to flip through the connecting rod 19, thereby adjusting the air duct resistance and controlling the air supply volume. The fan 18 can assist in adjusting the air supply volume under specific working conditions; The switching judgment module in the controller 22 is connected to the control unit in the processing unit 3. The switching judgment module judges the inlet air temperature of the terminal mechanism 1 according to the temperature data of the temperature probe 26. When the inlet air temperature is less than 20°C, it is automatically determined to be in cooling mode. When the inlet air temperature is greater than 25°C, it is automatically determined to be in heating mode. When 20°C≤inlet air temperature≤25°C, it is automatically determined to be in ventilation mode, maintaining the minimum air volume of the design working condition, thereby realizing the automatic switching control mode of the variable air volume terminal device, eliminating the control buttons (three control buttons of "cooling, ventilation, heating"), and reducing the temperature control surface. The design size of the plate saves the use of some processing materials and precision components, avoids the waste of some manpower, material and financial resources, reduces production costs, and indirectly achieves the purpose of energy conservation and emission reduction; at the same time, the switching judgment module comprehensively considers the data of the temperature probe 26, pressure sensor 1 28, pressure sensor 29 and air volume sensor 27, and accurately controls the air supply volume by adjusting the opening of the valve plate 117 and the speed of the fan 18. The device can realize a flexible automatic switching control mechanism, and efficiently switch between different control modes according to actual needs, thereby improving the overall performance of the air conditioning and ventilation system while reducing energy consumption.

[0025] The use method and working principle of this device: The variable air volume air conditioning system is composed of a processing unit 3, a blower 4, a terminal mechanism 1, an automatic switching mechanism 2, a room temperature regulator 5, etc. The processing unit 3 can control the blower 4 on the one hand, calculate the required air volume of the terminal mechanism 1 or the static pressure change at the terminal through the automatic switching mechanism 2, and control the frequency change of the inverter 6, thereby adjusting the air volume of the processing unit 3. On the other hand, the processing unit 3 can control the opening of the refrigerant water valve 7 and the heat medium water valve 8, thereby controlling the outlet air temperature of the processing unit 3, so that the outlet air temperature is maintained in a relatively stable range (fluctuating within the range of ±0.5℃ of the set temperature); The temperature probe 26 monitors the air supply temperature in real time, the air volume sensor 27 measures the air supply volume in the housing 11 in real time, the pressure sensor 1 28 detects the pressure of the air inlet in real time, and the pressure sensor 29 detects the pressure of the air outlet in real time. The microprocessor 25 receives the collected data of the temperature probe 26 and the sensor group, and transmits the data to the controller 22; the controller 22 issues a control instruction to the control component 111 according to a preset control algorithm, thereby adjusting the air duct resistance and controlling the air supply volume. The fan 18 can assist in adjusting the air supply volume under specific working conditions; the switching judgment module in the controller 22 is connected to the control unit in the processing unit 3, and the switching judgment module judges the air inlet temperature of the terminal mechanism 1 according to the temperature data of the temperature probe 26, so as to realize the automatic switching control mode of the variable air volume terminal device.

[0026] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A variable air volume terminal device capable of automatic switching control, comprising a terminal mechanism (1), the terminal mechanism (1) comprising a housing (11), an assembly housing (12), an air inlet connection pipe (13), an air outlet connection pipe (15), a fan (18), a control component (111) and an air valve driver (112), a fixing ring (116) being rotatably mounted inside the housing (11), and a valve plate (117) being fixedly connected to the inner edge of the fixing ring (116), characterized in that: The outer edge of the fixing ring (116) is fixedly connected to a sound-absorbing felt (118); a wind tube assembly (17) is fixedly mounted on the inner wall of one end of the housing (11); the wind tube assembly (17) comprises a silencer wind tube (171); a dustproof net (172) is fixedly connected to the inner wall of one end of the silencer wind tube (171); and a plurality of guide plates (174) are evenly fixedly connected to the inner wall of the other end of the silencer wind tube (171); and a porous sound-absorbing felt (118) is bonded to the inner wall of the silencer wind tube (171). A sound pad (173), wherein a sound insulation board 1 (113) is fixedly connected to the inside of the housing (11), and a sound insulation board 2 (114) is fixedly connected to the outside of the sound insulation board 1 (113), and a sound absorbing filler (115) is filled between the sound insulation board 1 (113) and the sound insulation board 2 (114), and sound absorbing rings (110) are symmetrically fixedly connected to the two ends of the sound insulation board 2 (114), and an automatic switching mechanism (2) is fixedly installed on the outside of the housing (11), and the ... The mechanism (2) comprises a protective shell (21), a controller (22), a microprocessor (25) and an air volume sensor (27); an inner sleeve plate (24) is fixedly connected to the interior of the protective shell (21), and an inner edge of the inner sleeve plate (24) is fixedly connected to the outer edge of the outer shell (11); a temperature probe (26) is fixedly connected to the top wall at one end of the protective shell (21); a pressure sensor 1 (28) is fixedly connected to the bottom wall at one end of the protective shell (21); and a pressure sensor 2 (29) is fixedly connected to the bottom wall at the other end of the protective shell (21); one end of the temperature probe (26), the air volume sensor (27), the pressure sensor 1 (28) and the pressure sensor 2 (29) all extend into the interior of the outer shell (11); the temperature probe (26), the air volume sensor (27), the pressure sensor 1 (28) and the pressure sensor 2 (29) are all electrically connected to the microprocessor (25); and the controller (22) is electrically connected to the control component (111).

2. The variable air volume terminal device capable of automatic switching control according to claim 1 is characterized in that: A sound insulation filler (210) is filled between the protective shell (21) and the inner plate (24); the bottom end of the controller (22) is fixedly mounted to the top end of the protective shell (21); and the microprocessor (25) is fixedly mounted on the bottom of the controller (22).

3. The variable air volume terminal device capable of automatic switching control according to claim 1 is characterized in that: The fan (18) is fixedly mounted inside the outer shell (11), and the bottom end of the assembly shell (12) is fixedly mounted on the top of the outer shell (11).

4. The variable air volume terminal device capable of automatic switching control according to claim 1 is characterized in that: The control component (111) is fixedly mounted inside the top end of the assembly shell (12), and the air valve driver (112) is fixedly mounted inside the bottom end of the assembly shell (12).

5. The variable air volume terminal device capable of automatic switching control according to claim 1 is characterized in that: A connecting rod (19) is provided at the bottom output end of the air valve driver (112), and the bottom end of the connecting rod (19) passes through the housing (11) and is fixedly connected to the top of the fixing ring (116).

6. The variable air volume terminal device capable of automatic switching control according to claim 1 is characterized in that: One end of the shell (11) is welded to one end of the air inlet connecting pipe (13), and the other end of the shell (11) is welded to one end of the air outlet connecting pipe (15); a first connecting flange (14) is welded to the outer wall of one end of the air inlet connecting pipe (13), and a second connecting flange (16) is welded to the outer side of one end of the air outlet connecting pipe (15).

7. The variable air volume terminal device capable of automatic switching control according to claim 6 is characterized in that: A mounting frame (23) is welded to the bottom of the protective shell (21); one end of the air inlet connecting pipe (13) is fixedly connected to the air inlet pipe (9); and one end of the air outlet connecting pipe (15) is fixedly connected to the air outlet pipe (10).

8. The variable air volume terminal device capable of automatic switching control according to claim 7 is characterized in that: A room temperature regulator (5) is provided at one end of the air outlet pipe (10), a blower (4) is provided at one end of the air inlet pipe (9), one end of the blower (4) is fixedly connected to a processing unit (3), a frequency converter (6) is provided inside the processing unit (3), a refrigerant water valve (7) is provided at one end of the inner wall of the processing unit (3), and a heat medium water valve (8) is provided at the other end of the inner wall of the processing unit (3).

9. A control method for a variable air volume terminal device capable of automatic switching control, characterized in that: The variable air volume terminal device capable of automatic switching control according to any one of claims 1 to 8 is used, comprising the following steps: S1. In a variable air volume air conditioning system, the air supply fan (4) delivers cold air or hot air to the terminal mechanism (1) through the air inlet pipe (9), and then delivers the cold air or hot air to the room through the air outlet pipe (10). The terminal mechanism (1) and the automatic switching mechanism (2) are controlled by the command of the room temperature regulator (5) and automatically adjust the air supply volume according to the room temperature. The processing unit (3) can control the air supply fan (4) on the one hand, calculate the required air volume of the terminal mechanism (1) or the static pressure change at the terminal through the automatic switching mechanism (2), and control the frequency change of the inverter (6), thereby adjusting the air supply volume of the processing unit (3). On the other hand, the processing unit (3) can control the opening of the refrigerant water valve (7) and the heat medium water valve (8), thereby controlling the outlet air temperature of the processing unit (3); S2, monitoring the supply air temperature in real time through the temperature probe (26), measuring the supply air volume in the housing (11) in real time through the air volume sensor (27), detecting the pressure at the air inlet in real time through the pressure sensor 1 (28), and detecting the pressure at the air outlet in real time through the pressure sensor 2 (29), the microprocessor (25) receives the collected data from the temperature probe (26) and the sensor group, and transmits the data to the controller (22); S3, the controller (22) issues a control instruction to the control component (111) according to a preset control algorithm, the control component (111) controls the start and stop of the air valve driver (112), the air valve driver (112) can drive the fixed ring (116) and the valve plate (117) to flip through the connecting rod (19), thereby adjusting the air duct resistance, thereby controlling the air supply volume, and the fan (18) can assist in adjusting the air supply volume under specific working conditions; S4, a switching judgment module in the controller (22) is connected to the control unit in the processing unit (3), and the switching judgment module judges the inlet air temperature of the terminal mechanism (1) according to the temperature data of the temperature probe (26). When the inlet air temperature is less than 20°C, it is automatically determined to be in cooling mode; when the inlet air temperature is greater than 25°C, it is automatically determined to be in heating mode; when 20°C≤inlet air temperature≤25°C, it is automatically determined to be in ventilation mode to maintain the minimum air volume of the design working condition; S5, the switching judgment module comprehensively considers the data of the temperature probe (26), the pressure sensor 1 (28), the pressure sensor 2 (29) and the air volume sensor (27), and accurately controls the air supply volume by adjusting the opening of the valve plate (117) and the speed of the fan (18).

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